1 // SPDX-License-Identifier: GPL-2.0-only
2 /******************************************************************************
3 *
4 * Driver for Option High Speed Mobile Devices.
5 *
6 * Copyright (C) 2008 Option International
7 * Filip Aben <f.aben@option.com>
8 * Denis Joseph Barrow <d.barow@option.com>
9 * Jan Dumon <j.dumon@option.com>
10 * Copyright (C) 2007 Andrew Bird (Sphere Systems Ltd)
11 * <ajb@spheresystems.co.uk>
12 * Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
13 * Copyright (C) 2008 Novell, Inc.
14 *
15 *****************************************************************************/
16
17 /******************************************************************************
18 *
19 * Description of the device:
20 *
21 * Interface 0: Contains the IP network interface on the bulk end points.
22 * The multiplexed serial ports are using the interrupt and
23 * control endpoints.
24 * Interrupt contains a bitmap telling which multiplexed
25 * serialport needs servicing.
26 *
27 * Interface 1: Diagnostics port, uses bulk only, do not submit urbs until the
28 * port is opened, as this have a huge impact on the network port
29 * throughput.
30 *
31 * Interface 2: Standard modem interface - circuit switched interface, this
32 * can be used to make a standard ppp connection however it
33 * should not be used in conjunction with the IP network interface
34 * enabled for USB performance reasons i.e. if using this set
35 * ideally disable_net=1.
36 *
37 *****************************************************************************/
38
39 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
40
41 #include <linux/sched/signal.h>
42 #include <linux/slab.h>
43 #include <linux/init.h>
44 #include <linux/delay.h>
45 #include <linux/netdevice.h>
46 #include <linux/module.h>
47 #include <linux/ethtool.h>
48 #include <linux/usb.h>
49 #include <linux/tty.h>
50 #include <linux/tty_driver.h>
51 #include <linux/tty_flip.h>
52 #include <linux/kmod.h>
53 #include <linux/rfkill.h>
54 #include <linux/ip.h>
55 #include <linux/uaccess.h>
56 #include <linux/usb/cdc.h>
57 #include <net/arp.h>
58 #include <asm/byteorder.h>
59 #include <linux/serial_core.h>
60 #include <linux/serial.h>
61
62
63 #define MOD_AUTHOR "Option Wireless"
64 #define MOD_DESCRIPTION "USB High Speed Option driver"
65
66 #define HSO_MAX_NET_DEVICES 10
67 #define HSO__MAX_MTU 2048
68 #define DEFAULT_MTU 1500
69 #define DEFAULT_MRU 1500
70
71 #define CTRL_URB_RX_SIZE 1024
72 #define CTRL_URB_TX_SIZE 64
73
74 #define BULK_URB_RX_SIZE 4096
75 #define BULK_URB_TX_SIZE 8192
76
77 #define MUX_BULK_RX_BUF_SIZE HSO__MAX_MTU
78 #define MUX_BULK_TX_BUF_SIZE HSO__MAX_MTU
79 #define MUX_BULK_RX_BUF_COUNT 4
80 #define USB_TYPE_OPTION_VENDOR 0x20
81
82 /* These definitions are used with the struct hso_net flags element */
83 /* - use *_bit operations on it. (bit indices not values.) */
84 #define HSO_NET_RUNNING 0
85
86 #define HSO_NET_TX_TIMEOUT (HZ*10)
87
88 #define HSO_SERIAL_MAGIC 0x48534f31
89
90 /* Number of ttys to handle */
91 #define HSO_SERIAL_TTY_MINORS 256
92
93 #define MAX_RX_URBS 2
94
95 /*****************************************************************************/
96 /* Debugging functions */
97 /*****************************************************************************/
98 #define hso_dbg(lvl, fmt, ...) \
99 do { \
100 if ((lvl) & debug) \
101 pr_info("[%d:%s] " fmt, \
102 __LINE__, __func__, ##__VA_ARGS__); \
103 } while (0)
104
105 /*****************************************************************************/
106 /* Enumerators */
107 /*****************************************************************************/
108 enum pkt_parse_state {
109 WAIT_IP,
110 WAIT_DATA,
111 WAIT_SYNC
112 };
113
114 /*****************************************************************************/
115 /* Structs */
116 /*****************************************************************************/
117
118 struct hso_shared_int {
119 struct usb_endpoint_descriptor *intr_endp;
120 void *shared_intr_buf;
121 struct urb *shared_intr_urb;
122 struct usb_device *usb;
123 int use_count;
124 int ref_count;
125 struct mutex shared_int_lock;
126 };
127
128 struct hso_net {
129 struct hso_device *parent;
130 struct net_device *net;
131 struct rfkill *rfkill;
132 char name[24];
133
134 struct usb_endpoint_descriptor *in_endp;
135 struct usb_endpoint_descriptor *out_endp;
136
137 struct urb *mux_bulk_rx_urb_pool[MUX_BULK_RX_BUF_COUNT];
138 struct urb *mux_bulk_tx_urb;
139 void *mux_bulk_rx_buf_pool[MUX_BULK_RX_BUF_COUNT];
140 void *mux_bulk_tx_buf;
141
142 struct sk_buff *skb_rx_buf;
143 struct sk_buff *skb_tx_buf;
144
145 enum pkt_parse_state rx_parse_state;
146 spinlock_t net_lock;
147
148 unsigned short rx_buf_size;
149 unsigned short rx_buf_missing;
150 struct iphdr rx_ip_hdr;
151
152 unsigned long flags;
153 };
154
155 enum rx_ctrl_state{
156 RX_IDLE,
157 RX_SENT,
158 RX_PENDING
159 };
160
161 #define BM_REQUEST_TYPE (0xa1)
162 #define B_NOTIFICATION (0x20)
163 #define W_VALUE (0x0)
164 #define W_LENGTH (0x2)
165
166 #define B_OVERRUN (0x1<<6)
167 #define B_PARITY (0x1<<5)
168 #define B_FRAMING (0x1<<4)
169 #define B_RING_SIGNAL (0x1<<3)
170 #define B_BREAK (0x1<<2)
171 #define B_TX_CARRIER (0x1<<1)
172 #define B_RX_CARRIER (0x1<<0)
173
174 struct hso_serial_state_notification {
175 u8 bmRequestType;
176 u8 bNotification;
177 u16 wValue;
178 u16 wIndex;
179 u16 wLength;
180 u16 UART_state_bitmap;
181 } __packed;
182
183 struct hso_tiocmget {
184 struct mutex mutex;
185 wait_queue_head_t waitq;
186 int intr_completed;
187 struct usb_endpoint_descriptor *endp;
188 struct urb *urb;
189 struct hso_serial_state_notification *serial_state_notification;
190 u16 prev_UART_state_bitmap;
191 struct uart_icount icount;
192 };
193
194
195 struct hso_serial {
196 struct hso_device *parent;
197 int magic;
198 u8 minor;
199
200 struct hso_shared_int *shared_int;
201
202 /* rx/tx urb could be either a bulk urb or a control urb depending
203 on which serial port it is used on. */
204 struct urb *rx_urb[MAX_RX_URBS];
205 u8 num_rx_urbs;
206 u8 *rx_data[MAX_RX_URBS];
207 u16 rx_data_length; /* should contain allocated length */
208
209 struct urb *tx_urb;
210 u8 *tx_data;
211 u8 *tx_buffer;
212 u16 tx_data_length; /* should contain allocated length */
213 u16 tx_data_count;
214 u16 tx_buffer_count;
215 struct usb_ctrlrequest ctrl_req_tx;
216 struct usb_ctrlrequest ctrl_req_rx;
217
218 struct usb_endpoint_descriptor *in_endp;
219 struct usb_endpoint_descriptor *out_endp;
220
221 enum rx_ctrl_state rx_state;
222 u8 rts_state;
223 u8 dtr_state;
224 unsigned tx_urb_used:1;
225
226 struct tty_port port;
227 /* from usb_serial_port */
228 spinlock_t serial_lock;
229
230 int (*write_data) (struct hso_serial *serial);
231 struct hso_tiocmget *tiocmget;
232 /* Hacks required to get flow control
233 * working on the serial receive buffers
234 * so as not to drop characters on the floor.
235 */
236 int curr_rx_urb_idx;
237 u8 rx_urb_filled[MAX_RX_URBS];
238 struct tasklet_struct unthrottle_tasklet;
239 };
240
241 struct hso_device {
242 union {
243 struct hso_serial *dev_serial;
244 struct hso_net *dev_net;
245 } port_data;
246
247 u32 port_spec;
248
249 u8 is_active;
250 u8 usb_gone;
251 struct work_struct async_get_intf;
252 struct work_struct async_put_intf;
253
254 struct usb_device *usb;
255 struct usb_interface *interface;
256
257 struct device *dev;
258 struct kref ref;
259 struct mutex mutex;
260 };
261
262 /* Type of interface */
263 #define HSO_INTF_MASK 0xFF00
264 #define HSO_INTF_MUX 0x0100
265 #define HSO_INTF_BULK 0x0200
266
267 /* Type of port */
268 #define HSO_PORT_MASK 0xFF
269 #define HSO_PORT_NO_PORT 0x0
270 #define HSO_PORT_CONTROL 0x1
271 #define HSO_PORT_APP 0x2
272 #define HSO_PORT_GPS 0x3
273 #define HSO_PORT_PCSC 0x4
274 #define HSO_PORT_APP2 0x5
275 #define HSO_PORT_GPS_CONTROL 0x6
276 #define HSO_PORT_MSD 0x7
277 #define HSO_PORT_VOICE 0x8
278 #define HSO_PORT_DIAG2 0x9
279 #define HSO_PORT_DIAG 0x10
280 #define HSO_PORT_MODEM 0x11
281 #define HSO_PORT_NETWORK 0x12
282
283 /* Additional device info */
284 #define HSO_INFO_MASK 0xFF000000
285 #define HSO_INFO_CRC_BUG 0x01000000
286
287 /*****************************************************************************/
288 /* Prototypes */
289 /*****************************************************************************/
290 /* Serial driver functions */
291 static int hso_serial_tiocmset(struct tty_struct *tty,
292 unsigned int set, unsigned int clear);
293 static void ctrl_callback(struct urb *urb);
294 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial);
295 static void hso_kick_transmit(struct hso_serial *serial);
296 /* Helper functions */
297 static int hso_mux_submit_intr_urb(struct hso_shared_int *mux_int,
298 struct usb_device *usb, gfp_t gfp);
299 static void handle_usb_error(int status, const char *function,
300 struct hso_device *hso_dev);
301 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
302 int type, int dir);
303 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports);
304 static void hso_free_interface(struct usb_interface *intf);
305 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags);
306 static int hso_stop_serial_device(struct hso_device *hso_dev);
307 static int hso_start_net_device(struct hso_device *hso_dev);
308 static void hso_free_shared_int(struct hso_shared_int *shared_int);
309 static int hso_stop_net_device(struct hso_device *hso_dev);
310 static void hso_serial_ref_free(struct kref *ref);
311 static void hso_std_serial_read_bulk_callback(struct urb *urb);
312 static int hso_mux_serial_read(struct hso_serial *serial);
313 static void async_get_intf(struct work_struct *data);
314 static void async_put_intf(struct work_struct *data);
315 static int hso_put_activity(struct hso_device *hso_dev);
316 static int hso_get_activity(struct hso_device *hso_dev);
317 static void tiocmget_intr_callback(struct urb *urb);
318 /*****************************************************************************/
319 /* Helping functions */
320 /*****************************************************************************/
321
322 /* #define DEBUG */
323
dev2net(struct hso_device * hso_dev)324 static inline struct hso_net *dev2net(struct hso_device *hso_dev)
325 {
326 return hso_dev->port_data.dev_net;
327 }
328
dev2ser(struct hso_device * hso_dev)329 static inline struct hso_serial *dev2ser(struct hso_device *hso_dev)
330 {
331 return hso_dev->port_data.dev_serial;
332 }
333
334 /* Debugging functions */
335 #ifdef DEBUG
dbg_dump(int line_count,const char * func_name,unsigned char * buf,unsigned int len)336 static void dbg_dump(int line_count, const char *func_name, unsigned char *buf,
337 unsigned int len)
338 {
339 static char name[255];
340
341 sprintf(name, "hso[%d:%s]", line_count, func_name);
342 print_hex_dump_bytes(name, DUMP_PREFIX_NONE, buf, len);
343 }
344
345 #define DUMP(buf_, len_) \
346 dbg_dump(__LINE__, __func__, (unsigned char *)buf_, len_)
347
348 #define DUMP1(buf_, len_) \
349 do { \
350 if (0x01 & debug) \
351 DUMP(buf_, len_); \
352 } while (0)
353 #else
354 #define DUMP(buf_, len_)
355 #define DUMP1(buf_, len_)
356 #endif
357
358 /* module parameters */
359 static int debug;
360 static int tty_major;
361 static int disable_net;
362
363 /* driver info */
364 static const char driver_name[] = "hso";
365 static const char tty_filename[] = "ttyHS";
366 static const char *version = __FILE__ ": " MOD_AUTHOR;
367 /* the usb driver itself (registered in hso_init) */
368 static struct usb_driver hso_driver;
369 /* serial structures */
370 static struct tty_driver *tty_drv;
371 static struct hso_device *serial_table[HSO_SERIAL_TTY_MINORS];
372 static struct hso_device *network_table[HSO_MAX_NET_DEVICES];
373 static DEFINE_SPINLOCK(serial_table_lock);
374
375 static const s32 default_port_spec[] = {
376 HSO_INTF_MUX | HSO_PORT_NETWORK,
377 HSO_INTF_BULK | HSO_PORT_DIAG,
378 HSO_INTF_BULK | HSO_PORT_MODEM,
379 0
380 };
381
382 static const s32 icon321_port_spec[] = {
383 HSO_INTF_MUX | HSO_PORT_NETWORK,
384 HSO_INTF_BULK | HSO_PORT_DIAG2,
385 HSO_INTF_BULK | HSO_PORT_MODEM,
386 HSO_INTF_BULK | HSO_PORT_DIAG,
387 0
388 };
389
390 #define default_port_device(vendor, product) \
391 USB_DEVICE(vendor, product), \
392 .driver_info = (kernel_ulong_t)default_port_spec
393
394 #define icon321_port_device(vendor, product) \
395 USB_DEVICE(vendor, product), \
396 .driver_info = (kernel_ulong_t)icon321_port_spec
397
398 /* list of devices we support */
399 static const struct usb_device_id hso_ids[] = {
400 {default_port_device(0x0af0, 0x6711)},
401 {default_port_device(0x0af0, 0x6731)},
402 {default_port_device(0x0af0, 0x6751)},
403 {default_port_device(0x0af0, 0x6771)},
404 {default_port_device(0x0af0, 0x6791)},
405 {default_port_device(0x0af0, 0x6811)},
406 {default_port_device(0x0af0, 0x6911)},
407 {default_port_device(0x0af0, 0x6951)},
408 {default_port_device(0x0af0, 0x6971)},
409 {default_port_device(0x0af0, 0x7011)},
410 {default_port_device(0x0af0, 0x7031)},
411 {default_port_device(0x0af0, 0x7051)},
412 {default_port_device(0x0af0, 0x7071)},
413 {default_port_device(0x0af0, 0x7111)},
414 {default_port_device(0x0af0, 0x7211)},
415 {default_port_device(0x0af0, 0x7251)},
416 {default_port_device(0x0af0, 0x7271)},
417 {default_port_device(0x0af0, 0x7311)},
418 {default_port_device(0x0af0, 0xc031)}, /* Icon-Edge */
419 {icon321_port_device(0x0af0, 0xd013)}, /* Module HSxPA */
420 {icon321_port_device(0x0af0, 0xd031)}, /* Icon-321 */
421 {icon321_port_device(0x0af0, 0xd033)}, /* Icon-322 */
422 {USB_DEVICE(0x0af0, 0x7301)}, /* GE40x */
423 {USB_DEVICE(0x0af0, 0x7361)}, /* GE40x */
424 {USB_DEVICE(0x0af0, 0x7381)}, /* GE40x */
425 {USB_DEVICE(0x0af0, 0x7401)}, /* GI 0401 */
426 {USB_DEVICE(0x0af0, 0x7501)}, /* GTM 382 */
427 {USB_DEVICE(0x0af0, 0x7601)}, /* GE40x */
428 {USB_DEVICE(0x0af0, 0x7701)},
429 {USB_DEVICE(0x0af0, 0x7706)},
430 {USB_DEVICE(0x0af0, 0x7801)},
431 {USB_DEVICE(0x0af0, 0x7901)},
432 {USB_DEVICE(0x0af0, 0x7A01)},
433 {USB_DEVICE(0x0af0, 0x7A05)},
434 {USB_DEVICE(0x0af0, 0x8200)},
435 {USB_DEVICE(0x0af0, 0x8201)},
436 {USB_DEVICE(0x0af0, 0x8300)},
437 {USB_DEVICE(0x0af0, 0x8302)},
438 {USB_DEVICE(0x0af0, 0x8304)},
439 {USB_DEVICE(0x0af0, 0x8400)},
440 {USB_DEVICE(0x0af0, 0x8600)},
441 {USB_DEVICE(0x0af0, 0x8800)},
442 {USB_DEVICE(0x0af0, 0x8900)},
443 {USB_DEVICE(0x0af0, 0x9000)},
444 {USB_DEVICE(0x0af0, 0x9200)}, /* Option GTM671WFS */
445 {USB_DEVICE(0x0af0, 0xd035)},
446 {USB_DEVICE(0x0af0, 0xd055)},
447 {USB_DEVICE(0x0af0, 0xd155)},
448 {USB_DEVICE(0x0af0, 0xd255)},
449 {USB_DEVICE(0x0af0, 0xd057)},
450 {USB_DEVICE(0x0af0, 0xd157)},
451 {USB_DEVICE(0x0af0, 0xd257)},
452 {USB_DEVICE(0x0af0, 0xd357)},
453 {USB_DEVICE(0x0af0, 0xd058)},
454 {USB_DEVICE(0x0af0, 0xc100)},
455 {}
456 };
457 MODULE_DEVICE_TABLE(usb, hso_ids);
458
459 /* Sysfs attribute */
hso_sysfs_show_porttype(struct device * dev,struct device_attribute * attr,char * buf)460 static ssize_t hso_sysfs_show_porttype(struct device *dev,
461 struct device_attribute *attr,
462 char *buf)
463 {
464 struct hso_device *hso_dev = dev_get_drvdata(dev);
465 char *port_name;
466
467 if (!hso_dev)
468 return 0;
469
470 switch (hso_dev->port_spec & HSO_PORT_MASK) {
471 case HSO_PORT_CONTROL:
472 port_name = "Control";
473 break;
474 case HSO_PORT_APP:
475 port_name = "Application";
476 break;
477 case HSO_PORT_APP2:
478 port_name = "Application2";
479 break;
480 case HSO_PORT_GPS:
481 port_name = "GPS";
482 break;
483 case HSO_PORT_GPS_CONTROL:
484 port_name = "GPS Control";
485 break;
486 case HSO_PORT_PCSC:
487 port_name = "PCSC";
488 break;
489 case HSO_PORT_DIAG:
490 port_name = "Diagnostic";
491 break;
492 case HSO_PORT_DIAG2:
493 port_name = "Diagnostic2";
494 break;
495 case HSO_PORT_MODEM:
496 port_name = "Modem";
497 break;
498 case HSO_PORT_NETWORK:
499 port_name = "Network";
500 break;
501 default:
502 port_name = "Unknown";
503 break;
504 }
505
506 return sprintf(buf, "%s\n", port_name);
507 }
508 static DEVICE_ATTR(hsotype, 0444, hso_sysfs_show_porttype, NULL);
509
510 static struct attribute *hso_serial_dev_attrs[] = {
511 &dev_attr_hsotype.attr,
512 NULL
513 };
514
515 ATTRIBUTE_GROUPS(hso_serial_dev);
516
hso_urb_to_index(struct hso_serial * serial,struct urb * urb)517 static int hso_urb_to_index(struct hso_serial *serial, struct urb *urb)
518 {
519 int idx;
520
521 for (idx = 0; idx < serial->num_rx_urbs; idx++)
522 if (serial->rx_urb[idx] == urb)
523 return idx;
524 dev_err(serial->parent->dev, "hso_urb_to_index failed\n");
525 return -1;
526 }
527
528 /* converts mux value to a port spec value */
hso_mux_to_port(int mux)529 static u32 hso_mux_to_port(int mux)
530 {
531 u32 result;
532
533 switch (mux) {
534 case 0x1:
535 result = HSO_PORT_CONTROL;
536 break;
537 case 0x2:
538 result = HSO_PORT_APP;
539 break;
540 case 0x4:
541 result = HSO_PORT_PCSC;
542 break;
543 case 0x8:
544 result = HSO_PORT_GPS;
545 break;
546 case 0x10:
547 result = HSO_PORT_APP2;
548 break;
549 default:
550 result = HSO_PORT_NO_PORT;
551 }
552 return result;
553 }
554
555 /* converts port spec value to a mux value */
hso_port_to_mux(int port)556 static u32 hso_port_to_mux(int port)
557 {
558 u32 result;
559
560 switch (port & HSO_PORT_MASK) {
561 case HSO_PORT_CONTROL:
562 result = 0x0;
563 break;
564 case HSO_PORT_APP:
565 result = 0x1;
566 break;
567 case HSO_PORT_PCSC:
568 result = 0x2;
569 break;
570 case HSO_PORT_GPS:
571 result = 0x3;
572 break;
573 case HSO_PORT_APP2:
574 result = 0x4;
575 break;
576 default:
577 result = 0x0;
578 }
579 return result;
580 }
581
get_serial_by_shared_int_and_type(struct hso_shared_int * shared_int,int mux)582 static struct hso_serial *get_serial_by_shared_int_and_type(
583 struct hso_shared_int *shared_int,
584 int mux)
585 {
586 int i, port;
587
588 port = hso_mux_to_port(mux);
589
590 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
591 if (serial_table[i] &&
592 (dev2ser(serial_table[i])->shared_int == shared_int) &&
593 ((serial_table[i]->port_spec & HSO_PORT_MASK) == port)) {
594 return dev2ser(serial_table[i]);
595 }
596 }
597
598 return NULL;
599 }
600
get_serial_by_index(unsigned index)601 static struct hso_serial *get_serial_by_index(unsigned index)
602 {
603 struct hso_serial *serial = NULL;
604 unsigned long flags;
605
606 spin_lock_irqsave(&serial_table_lock, flags);
607 if (serial_table[index])
608 serial = dev2ser(serial_table[index]);
609 spin_unlock_irqrestore(&serial_table_lock, flags);
610
611 return serial;
612 }
613
obtain_minor(struct hso_serial * serial)614 static int obtain_minor(struct hso_serial *serial)
615 {
616 int index;
617 unsigned long flags;
618
619 spin_lock_irqsave(&serial_table_lock, flags);
620 for (index = 0; index < HSO_SERIAL_TTY_MINORS; index++) {
621 if (serial_table[index] == NULL) {
622 serial_table[index] = serial->parent;
623 serial->minor = index;
624 spin_unlock_irqrestore(&serial_table_lock, flags);
625 return 0;
626 }
627 }
628 spin_unlock_irqrestore(&serial_table_lock, flags);
629
630 pr_err("%s: no free serial devices in table\n", __func__);
631 return -1;
632 }
633
release_minor(struct hso_serial * serial)634 static void release_minor(struct hso_serial *serial)
635 {
636 unsigned long flags;
637
638 spin_lock_irqsave(&serial_table_lock, flags);
639 serial_table[serial->minor] = NULL;
640 spin_unlock_irqrestore(&serial_table_lock, flags);
641 }
642
handle_usb_error(int status,const char * function,struct hso_device * hso_dev)643 static void handle_usb_error(int status, const char *function,
644 struct hso_device *hso_dev)
645 {
646 char *explanation;
647
648 switch (status) {
649 case -ENODEV:
650 explanation = "no device";
651 break;
652 case -ENOENT:
653 explanation = "endpoint not enabled";
654 break;
655 case -EPIPE:
656 explanation = "endpoint stalled";
657 break;
658 case -ENOSPC:
659 explanation = "not enough bandwidth";
660 break;
661 case -ESHUTDOWN:
662 explanation = "device disabled";
663 break;
664 case -EHOSTUNREACH:
665 explanation = "device suspended";
666 break;
667 case -EINVAL:
668 case -EAGAIN:
669 case -EFBIG:
670 case -EMSGSIZE:
671 explanation = "internal error";
672 break;
673 case -EILSEQ:
674 case -EPROTO:
675 case -ETIME:
676 case -ETIMEDOUT:
677 explanation = "protocol error";
678 if (hso_dev)
679 usb_queue_reset_device(hso_dev->interface);
680 break;
681 default:
682 explanation = "unknown status";
683 break;
684 }
685
686 /* log a meaningful explanation of an USB status */
687 hso_dbg(0x1, "%s: received USB status - %s (%d)\n",
688 function, explanation, status);
689 }
690
691 /* Network interface functions */
692
693 /* called when net interface is brought up by ifconfig */
hso_net_open(struct net_device * net)694 static int hso_net_open(struct net_device *net)
695 {
696 struct hso_net *odev = netdev_priv(net);
697 unsigned long flags = 0;
698
699 if (!odev) {
700 dev_err(&net->dev, "No net device !\n");
701 return -ENODEV;
702 }
703
704 odev->skb_tx_buf = NULL;
705
706 /* setup environment */
707 spin_lock_irqsave(&odev->net_lock, flags);
708 odev->rx_parse_state = WAIT_IP;
709 odev->rx_buf_size = 0;
710 odev->rx_buf_missing = sizeof(struct iphdr);
711 spin_unlock_irqrestore(&odev->net_lock, flags);
712
713 /* We are up and running. */
714 set_bit(HSO_NET_RUNNING, &odev->flags);
715 hso_start_net_device(odev->parent);
716
717 /* Tell the kernel we are ready to start receiving from it */
718 netif_start_queue(net);
719
720 return 0;
721 }
722
723 /* called when interface is brought down by ifconfig */
hso_net_close(struct net_device * net)724 static int hso_net_close(struct net_device *net)
725 {
726 struct hso_net *odev = netdev_priv(net);
727
728 /* we don't need the queue anymore */
729 netif_stop_queue(net);
730 /* no longer running */
731 clear_bit(HSO_NET_RUNNING, &odev->flags);
732
733 hso_stop_net_device(odev->parent);
734
735 /* done */
736 return 0;
737 }
738
739 /* USB tells is xmit done, we should start the netqueue again */
write_bulk_callback(struct urb * urb)740 static void write_bulk_callback(struct urb *urb)
741 {
742 struct hso_net *odev = urb->context;
743 int status = urb->status;
744
745 /* Sanity check */
746 if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
747 dev_err(&urb->dev->dev, "%s: device not running\n", __func__);
748 return;
749 }
750
751 /* Do we still have a valid kernel network device? */
752 if (!netif_device_present(odev->net)) {
753 dev_err(&urb->dev->dev, "%s: net device not present\n",
754 __func__);
755 return;
756 }
757
758 /* log status, but don't act on it, we don't need to resubmit anything
759 * anyhow */
760 if (status)
761 handle_usb_error(status, __func__, odev->parent);
762
763 hso_put_activity(odev->parent);
764
765 /* Tell the network interface we are ready for another frame */
766 netif_wake_queue(odev->net);
767 }
768
769 /* called by kernel when we need to transmit a packet */
hso_net_start_xmit(struct sk_buff * skb,struct net_device * net)770 static netdev_tx_t hso_net_start_xmit(struct sk_buff *skb,
771 struct net_device *net)
772 {
773 struct hso_net *odev = netdev_priv(net);
774 int result;
775
776 /* Tell the kernel, "No more frames 'til we are done with this one." */
777 netif_stop_queue(net);
778 if (hso_get_activity(odev->parent) == -EAGAIN) {
779 odev->skb_tx_buf = skb;
780 return NETDEV_TX_OK;
781 }
782
783 /* log if asked */
784 DUMP1(skb->data, skb->len);
785 /* Copy it from kernel memory to OUR memory */
786 memcpy(odev->mux_bulk_tx_buf, skb->data, skb->len);
787 hso_dbg(0x1, "len: %d/%d\n", skb->len, MUX_BULK_TX_BUF_SIZE);
788
789 /* Fill in the URB for shipping it out. */
790 usb_fill_bulk_urb(odev->mux_bulk_tx_urb,
791 odev->parent->usb,
792 usb_sndbulkpipe(odev->parent->usb,
793 odev->out_endp->
794 bEndpointAddress & 0x7F),
795 odev->mux_bulk_tx_buf, skb->len, write_bulk_callback,
796 odev);
797
798 /* Deal with the Zero Length packet problem, I hope */
799 odev->mux_bulk_tx_urb->transfer_flags |= URB_ZERO_PACKET;
800
801 /* Send the URB on its merry way. */
802 result = usb_submit_urb(odev->mux_bulk_tx_urb, GFP_ATOMIC);
803 if (result) {
804 dev_warn(&odev->parent->interface->dev,
805 "failed mux_bulk_tx_urb %d\n", result);
806 net->stats.tx_errors++;
807 netif_start_queue(net);
808 } else {
809 net->stats.tx_packets++;
810 net->stats.tx_bytes += skb->len;
811 }
812 dev_kfree_skb(skb);
813 /* we're done */
814 return NETDEV_TX_OK;
815 }
816
817 static const struct ethtool_ops ops = {
818 .get_link = ethtool_op_get_link
819 };
820
821 /* called when a packet did not ack after watchdogtimeout */
hso_net_tx_timeout(struct net_device * net,unsigned int txqueue)822 static void hso_net_tx_timeout(struct net_device *net, unsigned int txqueue)
823 {
824 struct hso_net *odev = netdev_priv(net);
825
826 if (!odev)
827 return;
828
829 /* Tell syslog we are hosed. */
830 dev_warn(&net->dev, "Tx timed out.\n");
831
832 /* Tear the waiting frame off the list */
833 if (odev->mux_bulk_tx_urb)
834 usb_unlink_urb(odev->mux_bulk_tx_urb);
835
836 /* Update statistics */
837 net->stats.tx_errors++;
838 }
839
840 /* make a real packet from the received USB buffer */
packetizeRx(struct hso_net * odev,unsigned char * ip_pkt,unsigned int count,unsigned char is_eop)841 static void packetizeRx(struct hso_net *odev, unsigned char *ip_pkt,
842 unsigned int count, unsigned char is_eop)
843 {
844 unsigned short temp_bytes;
845 unsigned short buffer_offset = 0;
846 unsigned short frame_len;
847
848 /* log if needed */
849 hso_dbg(0x1, "Rx %d bytes\n", count);
850 DUMP(ip_pkt, min(128, (int)count));
851
852 while (count) {
853 switch (odev->rx_parse_state) {
854 case WAIT_IP:
855 /* waiting for IP header. */
856 /* wanted bytes - size of ip header */
857 temp_bytes =
858 (count <
859 odev->rx_buf_missing) ? count : odev->
860 rx_buf_missing;
861
862 memcpy(((unsigned char *)(&odev->rx_ip_hdr)) +
863 odev->rx_buf_size, ip_pkt + buffer_offset,
864 temp_bytes);
865
866 odev->rx_buf_size += temp_bytes;
867 buffer_offset += temp_bytes;
868 odev->rx_buf_missing -= temp_bytes;
869 count -= temp_bytes;
870
871 if (!odev->rx_buf_missing) {
872 /* header is complete allocate an sk_buffer and
873 * continue to WAIT_DATA */
874 frame_len = ntohs(odev->rx_ip_hdr.tot_len);
875
876 if ((frame_len > DEFAULT_MRU) ||
877 (frame_len < sizeof(struct iphdr))) {
878 dev_err(&odev->net->dev,
879 "Invalid frame (%d) length\n",
880 frame_len);
881 odev->rx_parse_state = WAIT_SYNC;
882 continue;
883 }
884 /* Allocate an sk_buff */
885 odev->skb_rx_buf = netdev_alloc_skb(odev->net,
886 frame_len);
887 if (!odev->skb_rx_buf) {
888 /* We got no receive buffer. */
889 hso_dbg(0x1, "could not allocate memory\n");
890 odev->rx_parse_state = WAIT_SYNC;
891 continue;
892 }
893
894 /* Copy what we got so far. make room for iphdr
895 * after tail. */
896 skb_put_data(odev->skb_rx_buf,
897 (char *)&(odev->rx_ip_hdr),
898 sizeof(struct iphdr));
899
900 /* ETH_HLEN */
901 odev->rx_buf_size = sizeof(struct iphdr);
902
903 /* Filip actually use .tot_len */
904 odev->rx_buf_missing =
905 frame_len - sizeof(struct iphdr);
906 odev->rx_parse_state = WAIT_DATA;
907 }
908 break;
909
910 case WAIT_DATA:
911 temp_bytes = (count < odev->rx_buf_missing)
912 ? count : odev->rx_buf_missing;
913
914 /* Copy the rest of the bytes that are left in the
915 * buffer into the waiting sk_buf. */
916 /* Make room for temp_bytes after tail. */
917 skb_put_data(odev->skb_rx_buf,
918 ip_pkt + buffer_offset,
919 temp_bytes);
920
921 odev->rx_buf_missing -= temp_bytes;
922 count -= temp_bytes;
923 buffer_offset += temp_bytes;
924 odev->rx_buf_size += temp_bytes;
925 if (!odev->rx_buf_missing) {
926 /* Packet is complete. Inject into stack. */
927 /* We have IP packet here */
928 odev->skb_rx_buf->protocol = cpu_to_be16(ETH_P_IP);
929 skb_reset_mac_header(odev->skb_rx_buf);
930
931 /* Ship it off to the kernel */
932 netif_rx(odev->skb_rx_buf);
933 /* No longer our buffer. */
934 odev->skb_rx_buf = NULL;
935
936 /* update out statistics */
937 odev->net->stats.rx_packets++;
938
939 odev->net->stats.rx_bytes += odev->rx_buf_size;
940
941 odev->rx_buf_size = 0;
942 odev->rx_buf_missing = sizeof(struct iphdr);
943 odev->rx_parse_state = WAIT_IP;
944 }
945 break;
946
947 case WAIT_SYNC:
948 hso_dbg(0x1, " W_S\n");
949 count = 0;
950 break;
951 default:
952 hso_dbg(0x1, "\n");
953 count--;
954 break;
955 }
956 }
957
958 /* Recovery mechanism for WAIT_SYNC state. */
959 if (is_eop) {
960 if (odev->rx_parse_state == WAIT_SYNC) {
961 odev->rx_parse_state = WAIT_IP;
962 odev->rx_buf_size = 0;
963 odev->rx_buf_missing = sizeof(struct iphdr);
964 }
965 }
966 }
967
fix_crc_bug(struct urb * urb,__le16 max_packet_size)968 static void fix_crc_bug(struct urb *urb, __le16 max_packet_size)
969 {
970 static const u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF };
971 u32 rest = urb->actual_length % le16_to_cpu(max_packet_size);
972
973 if (((rest == 5) || (rest == 6)) &&
974 !memcmp(((u8 *)urb->transfer_buffer) + urb->actual_length - 4,
975 crc_check, 4)) {
976 urb->actual_length -= 4;
977 }
978 }
979
980 /* Moving data from usb to kernel (in interrupt state) */
read_bulk_callback(struct urb * urb)981 static void read_bulk_callback(struct urb *urb)
982 {
983 struct hso_net *odev = urb->context;
984 struct net_device *net;
985 int result;
986 unsigned long flags;
987 int status = urb->status;
988
989 /* is al ok? (Filip: Who's Al ?) */
990 if (status) {
991 handle_usb_error(status, __func__, odev->parent);
992 return;
993 }
994
995 /* Sanity check */
996 if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
997 hso_dbg(0x1, "BULK IN callback but driver is not active!\n");
998 return;
999 }
1000 usb_mark_last_busy(urb->dev);
1001
1002 net = odev->net;
1003
1004 if (!netif_device_present(net)) {
1005 /* Somebody killed our network interface... */
1006 return;
1007 }
1008
1009 if (odev->parent->port_spec & HSO_INFO_CRC_BUG)
1010 fix_crc_bug(urb, odev->in_endp->wMaxPacketSize);
1011
1012 /* do we even have a packet? */
1013 if (urb->actual_length) {
1014 /* Handle the IP stream, add header and push it onto network
1015 * stack if the packet is complete. */
1016 spin_lock_irqsave(&odev->net_lock, flags);
1017 packetizeRx(odev, urb->transfer_buffer, urb->actual_length,
1018 (urb->transfer_buffer_length >
1019 urb->actual_length) ? 1 : 0);
1020 spin_unlock_irqrestore(&odev->net_lock, flags);
1021 }
1022
1023 /* We are done with this URB, resubmit it. Prep the USB to wait for
1024 * another frame. Reuse same as received. */
1025 usb_fill_bulk_urb(urb,
1026 odev->parent->usb,
1027 usb_rcvbulkpipe(odev->parent->usb,
1028 odev->in_endp->
1029 bEndpointAddress & 0x7F),
1030 urb->transfer_buffer, MUX_BULK_RX_BUF_SIZE,
1031 read_bulk_callback, odev);
1032
1033 /* Give this to the USB subsystem so it can tell us when more data
1034 * arrives. */
1035 result = usb_submit_urb(urb, GFP_ATOMIC);
1036 if (result)
1037 dev_warn(&odev->parent->interface->dev,
1038 "%s failed submit mux_bulk_rx_urb %d\n", __func__,
1039 result);
1040 }
1041
1042 /* Serial driver functions */
1043
hso_init_termios(struct ktermios * termios)1044 static void hso_init_termios(struct ktermios *termios)
1045 {
1046 /*
1047 * The default requirements for this device are:
1048 */
1049 termios->c_iflag &=
1050 ~(IGNBRK /* disable ignore break */
1051 | BRKINT /* disable break causes interrupt */
1052 | PARMRK /* disable mark parity errors */
1053 | ISTRIP /* disable clear high bit of input characters */
1054 | INLCR /* disable translate NL to CR */
1055 | IGNCR /* disable ignore CR */
1056 | ICRNL /* disable translate CR to NL */
1057 | IXON); /* disable enable XON/XOFF flow control */
1058
1059 /* disable postprocess output characters */
1060 termios->c_oflag &= ~OPOST;
1061
1062 termios->c_lflag &=
1063 ~(ECHO /* disable echo input characters */
1064 | ECHONL /* disable echo new line */
1065 | ICANON /* disable erase, kill, werase, and rprnt
1066 special characters */
1067 | ISIG /* disable interrupt, quit, and suspend special
1068 characters */
1069 | IEXTEN); /* disable non-POSIX special characters */
1070
1071 termios->c_cflag &=
1072 ~(CSIZE /* no size */
1073 | PARENB /* disable parity bit */
1074 | CBAUD /* clear current baud rate */
1075 | CBAUDEX); /* clear current buad rate */
1076
1077 termios->c_cflag |= CS8; /* character size 8 bits */
1078
1079 /* baud rate 115200 */
1080 tty_termios_encode_baud_rate(termios, 115200, 115200);
1081 }
1082
_hso_serial_set_termios(struct tty_struct * tty,struct ktermios * old)1083 static void _hso_serial_set_termios(struct tty_struct *tty,
1084 struct ktermios *old)
1085 {
1086 struct hso_serial *serial = tty->driver_data;
1087
1088 if (!serial) {
1089 pr_err("%s: no tty structures", __func__);
1090 return;
1091 }
1092
1093 hso_dbg(0x8, "port %d\n", serial->minor);
1094
1095 /*
1096 * Fix up unsupported bits
1097 */
1098 tty->termios.c_iflag &= ~IXON; /* disable enable XON/XOFF flow control */
1099
1100 tty->termios.c_cflag &=
1101 ~(CSIZE /* no size */
1102 | PARENB /* disable parity bit */
1103 | CBAUD /* clear current baud rate */
1104 | CBAUDEX); /* clear current buad rate */
1105
1106 tty->termios.c_cflag |= CS8; /* character size 8 bits */
1107
1108 /* baud rate 115200 */
1109 tty_encode_baud_rate(tty, 115200, 115200);
1110 }
1111
hso_resubmit_rx_bulk_urb(struct hso_serial * serial,struct urb * urb)1112 static void hso_resubmit_rx_bulk_urb(struct hso_serial *serial, struct urb *urb)
1113 {
1114 int result;
1115 /* We are done with this URB, resubmit it. Prep the USB to wait for
1116 * another frame */
1117 usb_fill_bulk_urb(urb, serial->parent->usb,
1118 usb_rcvbulkpipe(serial->parent->usb,
1119 serial->in_endp->
1120 bEndpointAddress & 0x7F),
1121 urb->transfer_buffer, serial->rx_data_length,
1122 hso_std_serial_read_bulk_callback, serial);
1123 /* Give this to the USB subsystem so it can tell us when more data
1124 * arrives. */
1125 result = usb_submit_urb(urb, GFP_ATOMIC);
1126 if (result) {
1127 dev_err(&urb->dev->dev, "%s failed submit serial rx_urb %d\n",
1128 __func__, result);
1129 }
1130 }
1131
1132
1133
1134
put_rxbuf_data_and_resubmit_bulk_urb(struct hso_serial * serial)1135 static void put_rxbuf_data_and_resubmit_bulk_urb(struct hso_serial *serial)
1136 {
1137 int count;
1138 struct urb *curr_urb;
1139
1140 while (serial->rx_urb_filled[serial->curr_rx_urb_idx]) {
1141 curr_urb = serial->rx_urb[serial->curr_rx_urb_idx];
1142 count = put_rxbuf_data(curr_urb, serial);
1143 if (count == -1)
1144 return;
1145 if (count == 0) {
1146 serial->curr_rx_urb_idx++;
1147 if (serial->curr_rx_urb_idx >= serial->num_rx_urbs)
1148 serial->curr_rx_urb_idx = 0;
1149 hso_resubmit_rx_bulk_urb(serial, curr_urb);
1150 }
1151 }
1152 }
1153
put_rxbuf_data_and_resubmit_ctrl_urb(struct hso_serial * serial)1154 static void put_rxbuf_data_and_resubmit_ctrl_urb(struct hso_serial *serial)
1155 {
1156 int count = 0;
1157 struct urb *urb;
1158
1159 urb = serial->rx_urb[0];
1160 if (serial->port.count > 0) {
1161 count = put_rxbuf_data(urb, serial);
1162 if (count == -1)
1163 return;
1164 }
1165 /* Re issue a read as long as we receive data. */
1166
1167 if (count == 0 && ((urb->actual_length != 0) ||
1168 (serial->rx_state == RX_PENDING))) {
1169 serial->rx_state = RX_SENT;
1170 hso_mux_serial_read(serial);
1171 } else
1172 serial->rx_state = RX_IDLE;
1173 }
1174
1175
1176 /* read callback for Diag and CS port */
hso_std_serial_read_bulk_callback(struct urb * urb)1177 static void hso_std_serial_read_bulk_callback(struct urb *urb)
1178 {
1179 struct hso_serial *serial = urb->context;
1180 int status = urb->status;
1181 unsigned long flags;
1182
1183 hso_dbg(0x8, "--- Got serial_read_bulk callback %02x ---\n", status);
1184
1185 /* sanity check */
1186 if (!serial) {
1187 hso_dbg(0x1, "serial == NULL\n");
1188 return;
1189 }
1190 if (status) {
1191 handle_usb_error(status, __func__, serial->parent);
1192 return;
1193 }
1194
1195 hso_dbg(0x1, "Actual length = %d\n", urb->actual_length);
1196 DUMP1(urb->transfer_buffer, urb->actual_length);
1197
1198 /* Anyone listening? */
1199 if (serial->port.count == 0)
1200 return;
1201
1202 if (serial->parent->port_spec & HSO_INFO_CRC_BUG)
1203 fix_crc_bug(urb, serial->in_endp->wMaxPacketSize);
1204 /* Valid data, handle RX data */
1205 spin_lock_irqsave(&serial->serial_lock, flags);
1206 serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 1;
1207 put_rxbuf_data_and_resubmit_bulk_urb(serial);
1208 spin_unlock_irqrestore(&serial->serial_lock, flags);
1209 }
1210
1211 /*
1212 * This needs to be a tasklet otherwise we will
1213 * end up recursively calling this function.
1214 */
hso_unthrottle_tasklet(struct tasklet_struct * t)1215 static void hso_unthrottle_tasklet(struct tasklet_struct *t)
1216 {
1217 struct hso_serial *serial = from_tasklet(serial, t,
1218 unthrottle_tasklet);
1219 unsigned long flags;
1220
1221 spin_lock_irqsave(&serial->serial_lock, flags);
1222 if ((serial->parent->port_spec & HSO_INTF_MUX))
1223 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
1224 else
1225 put_rxbuf_data_and_resubmit_bulk_urb(serial);
1226 spin_unlock_irqrestore(&serial->serial_lock, flags);
1227 }
1228
hso_unthrottle(struct tty_struct * tty)1229 static void hso_unthrottle(struct tty_struct *tty)
1230 {
1231 struct hso_serial *serial = tty->driver_data;
1232
1233 tasklet_hi_schedule(&serial->unthrottle_tasklet);
1234 }
1235
1236 /* open the requested serial port */
hso_serial_open(struct tty_struct * tty,struct file * filp)1237 static int hso_serial_open(struct tty_struct *tty, struct file *filp)
1238 {
1239 struct hso_serial *serial = get_serial_by_index(tty->index);
1240 int result;
1241
1242 /* sanity check */
1243 if (serial == NULL || serial->magic != HSO_SERIAL_MAGIC) {
1244 WARN_ON(1);
1245 tty->driver_data = NULL;
1246 hso_dbg(0x1, "Failed to open port\n");
1247 return -ENODEV;
1248 }
1249
1250 mutex_lock(&serial->parent->mutex);
1251 result = usb_autopm_get_interface(serial->parent->interface);
1252 if (result < 0)
1253 goto err_out;
1254
1255 hso_dbg(0x1, "Opening %d\n", serial->minor);
1256
1257 /* setup */
1258 tty->driver_data = serial;
1259 tty_port_tty_set(&serial->port, tty);
1260
1261 /* check for port already opened, if not set the termios */
1262 serial->port.count++;
1263 if (serial->port.count == 1) {
1264 serial->rx_state = RX_IDLE;
1265 /* Force default termio settings */
1266 _hso_serial_set_termios(tty, NULL);
1267 tasklet_setup(&serial->unthrottle_tasklet,
1268 hso_unthrottle_tasklet);
1269 result = hso_start_serial_device(serial->parent, GFP_KERNEL);
1270 if (result) {
1271 hso_stop_serial_device(serial->parent);
1272 serial->port.count--;
1273 } else {
1274 kref_get(&serial->parent->ref);
1275 }
1276 } else {
1277 hso_dbg(0x1, "Port was already open\n");
1278 }
1279
1280 usb_autopm_put_interface(serial->parent->interface);
1281
1282 /* done */
1283 if (result)
1284 hso_serial_tiocmset(tty, TIOCM_RTS | TIOCM_DTR, 0);
1285 err_out:
1286 mutex_unlock(&serial->parent->mutex);
1287 return result;
1288 }
1289
1290 /* close the requested serial port */
hso_serial_close(struct tty_struct * tty,struct file * filp)1291 static void hso_serial_close(struct tty_struct *tty, struct file *filp)
1292 {
1293 struct hso_serial *serial = tty->driver_data;
1294 u8 usb_gone;
1295
1296 hso_dbg(0x1, "Closing serial port\n");
1297
1298 /* Open failed, no close cleanup required */
1299 if (serial == NULL)
1300 return;
1301
1302 mutex_lock(&serial->parent->mutex);
1303 usb_gone = serial->parent->usb_gone;
1304
1305 if (!usb_gone)
1306 usb_autopm_get_interface(serial->parent->interface);
1307
1308 /* reset the rts and dtr */
1309 /* do the actual close */
1310 serial->port.count--;
1311
1312 if (serial->port.count <= 0) {
1313 serial->port.count = 0;
1314 tty_port_tty_set(&serial->port, NULL);
1315 if (!usb_gone)
1316 hso_stop_serial_device(serial->parent);
1317 tasklet_kill(&serial->unthrottle_tasklet);
1318 }
1319
1320 if (!usb_gone)
1321 usb_autopm_put_interface(serial->parent->interface);
1322
1323 mutex_unlock(&serial->parent->mutex);
1324 }
1325
1326 /* close the requested serial port */
hso_serial_write(struct tty_struct * tty,const unsigned char * buf,int count)1327 static int hso_serial_write(struct tty_struct *tty, const unsigned char *buf,
1328 int count)
1329 {
1330 struct hso_serial *serial = tty->driver_data;
1331 int space, tx_bytes;
1332 unsigned long flags;
1333
1334 /* sanity check */
1335 if (serial == NULL) {
1336 pr_err("%s: serial is NULL\n", __func__);
1337 return -ENODEV;
1338 }
1339
1340 spin_lock_irqsave(&serial->serial_lock, flags);
1341
1342 space = serial->tx_data_length - serial->tx_buffer_count;
1343 tx_bytes = (count < space) ? count : space;
1344
1345 if (!tx_bytes)
1346 goto out;
1347
1348 memcpy(serial->tx_buffer + serial->tx_buffer_count, buf, tx_bytes);
1349 serial->tx_buffer_count += tx_bytes;
1350
1351 out:
1352 spin_unlock_irqrestore(&serial->serial_lock, flags);
1353
1354 hso_kick_transmit(serial);
1355 /* done */
1356 return tx_bytes;
1357 }
1358
1359 /* how much room is there for writing */
hso_serial_write_room(struct tty_struct * tty)1360 static int hso_serial_write_room(struct tty_struct *tty)
1361 {
1362 struct hso_serial *serial = tty->driver_data;
1363 int room;
1364 unsigned long flags;
1365
1366 spin_lock_irqsave(&serial->serial_lock, flags);
1367 room = serial->tx_data_length - serial->tx_buffer_count;
1368 spin_unlock_irqrestore(&serial->serial_lock, flags);
1369
1370 /* return free room */
1371 return room;
1372 }
1373
hso_serial_cleanup(struct tty_struct * tty)1374 static void hso_serial_cleanup(struct tty_struct *tty)
1375 {
1376 struct hso_serial *serial = tty->driver_data;
1377
1378 if (!serial)
1379 return;
1380
1381 kref_put(&serial->parent->ref, hso_serial_ref_free);
1382 }
1383
1384 /* setup the term */
hso_serial_set_termios(struct tty_struct * tty,struct ktermios * old)1385 static void hso_serial_set_termios(struct tty_struct *tty, struct ktermios *old)
1386 {
1387 struct hso_serial *serial = tty->driver_data;
1388 unsigned long flags;
1389
1390 if (old)
1391 hso_dbg(0x16, "Termios called with: cflags new[%u] - old[%u]\n",
1392 (unsigned int)tty->termios.c_cflag,
1393 (unsigned int)old->c_cflag);
1394
1395 /* the actual setup */
1396 spin_lock_irqsave(&serial->serial_lock, flags);
1397 if (serial->port.count)
1398 _hso_serial_set_termios(tty, old);
1399 else
1400 tty->termios = *old;
1401 spin_unlock_irqrestore(&serial->serial_lock, flags);
1402
1403 /* done */
1404 }
1405
1406 /* how many characters in the buffer */
hso_serial_chars_in_buffer(struct tty_struct * tty)1407 static int hso_serial_chars_in_buffer(struct tty_struct *tty)
1408 {
1409 struct hso_serial *serial = tty->driver_data;
1410 int chars;
1411 unsigned long flags;
1412
1413 /* sanity check */
1414 if (serial == NULL)
1415 return 0;
1416
1417 spin_lock_irqsave(&serial->serial_lock, flags);
1418 chars = serial->tx_buffer_count;
1419 spin_unlock_irqrestore(&serial->serial_lock, flags);
1420
1421 return chars;
1422 }
tiocmget_submit_urb(struct hso_serial * serial,struct hso_tiocmget * tiocmget,struct usb_device * usb)1423 static int tiocmget_submit_urb(struct hso_serial *serial,
1424 struct hso_tiocmget *tiocmget,
1425 struct usb_device *usb)
1426 {
1427 int result;
1428
1429 if (serial->parent->usb_gone)
1430 return -ENODEV;
1431 usb_fill_int_urb(tiocmget->urb, usb,
1432 usb_rcvintpipe(usb,
1433 tiocmget->endp->
1434 bEndpointAddress & 0x7F),
1435 tiocmget->serial_state_notification,
1436 sizeof(struct hso_serial_state_notification),
1437 tiocmget_intr_callback, serial,
1438 tiocmget->endp->bInterval);
1439 result = usb_submit_urb(tiocmget->urb, GFP_ATOMIC);
1440 if (result) {
1441 dev_warn(&usb->dev, "%s usb_submit_urb failed %d\n", __func__,
1442 result);
1443 }
1444 return result;
1445
1446 }
1447
tiocmget_intr_callback(struct urb * urb)1448 static void tiocmget_intr_callback(struct urb *urb)
1449 {
1450 struct hso_serial *serial = urb->context;
1451 struct hso_tiocmget *tiocmget;
1452 int status = urb->status;
1453 u16 UART_state_bitmap, prev_UART_state_bitmap;
1454 struct uart_icount *icount;
1455 struct hso_serial_state_notification *serial_state_notification;
1456 struct usb_device *usb;
1457 struct usb_interface *interface;
1458 int if_num;
1459
1460 /* Sanity checks */
1461 if (!serial)
1462 return;
1463 if (status) {
1464 handle_usb_error(status, __func__, serial->parent);
1465 return;
1466 }
1467
1468 /* tiocmget is only supported on HSO_PORT_MODEM */
1469 tiocmget = serial->tiocmget;
1470 if (!tiocmget)
1471 return;
1472 BUG_ON((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM);
1473
1474 usb = serial->parent->usb;
1475 interface = serial->parent->interface;
1476
1477 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1478
1479 /* wIndex should be the USB interface number of the port to which the
1480 * notification applies, which should always be the Modem port.
1481 */
1482 serial_state_notification = tiocmget->serial_state_notification;
1483 if (serial_state_notification->bmRequestType != BM_REQUEST_TYPE ||
1484 serial_state_notification->bNotification != B_NOTIFICATION ||
1485 le16_to_cpu(serial_state_notification->wValue) != W_VALUE ||
1486 le16_to_cpu(serial_state_notification->wIndex) != if_num ||
1487 le16_to_cpu(serial_state_notification->wLength) != W_LENGTH) {
1488 dev_warn(&usb->dev,
1489 "hso received invalid serial state notification\n");
1490 DUMP(serial_state_notification,
1491 sizeof(struct hso_serial_state_notification));
1492 } else {
1493 unsigned long flags;
1494
1495 UART_state_bitmap = le16_to_cpu(serial_state_notification->
1496 UART_state_bitmap);
1497 prev_UART_state_bitmap = tiocmget->prev_UART_state_bitmap;
1498 icount = &tiocmget->icount;
1499 spin_lock_irqsave(&serial->serial_lock, flags);
1500 if ((UART_state_bitmap & B_OVERRUN) !=
1501 (prev_UART_state_bitmap & B_OVERRUN))
1502 icount->parity++;
1503 if ((UART_state_bitmap & B_PARITY) !=
1504 (prev_UART_state_bitmap & B_PARITY))
1505 icount->parity++;
1506 if ((UART_state_bitmap & B_FRAMING) !=
1507 (prev_UART_state_bitmap & B_FRAMING))
1508 icount->frame++;
1509 if ((UART_state_bitmap & B_RING_SIGNAL) &&
1510 !(prev_UART_state_bitmap & B_RING_SIGNAL))
1511 icount->rng++;
1512 if ((UART_state_bitmap & B_BREAK) !=
1513 (prev_UART_state_bitmap & B_BREAK))
1514 icount->brk++;
1515 if ((UART_state_bitmap & B_TX_CARRIER) !=
1516 (prev_UART_state_bitmap & B_TX_CARRIER))
1517 icount->dsr++;
1518 if ((UART_state_bitmap & B_RX_CARRIER) !=
1519 (prev_UART_state_bitmap & B_RX_CARRIER))
1520 icount->dcd++;
1521 tiocmget->prev_UART_state_bitmap = UART_state_bitmap;
1522 spin_unlock_irqrestore(&serial->serial_lock, flags);
1523 tiocmget->intr_completed = 1;
1524 wake_up_interruptible(&tiocmget->waitq);
1525 }
1526 memset(serial_state_notification, 0,
1527 sizeof(struct hso_serial_state_notification));
1528 tiocmget_submit_urb(serial,
1529 tiocmget,
1530 serial->parent->usb);
1531 }
1532
1533 /*
1534 * next few functions largely stolen from drivers/serial/serial_core.c
1535 */
1536 /* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1537 * - mask passed in arg for lines of interest
1538 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1539 * Caller should use TIOCGICOUNT to see which one it was
1540 */
1541 static int
hso_wait_modem_status(struct hso_serial * serial,unsigned long arg)1542 hso_wait_modem_status(struct hso_serial *serial, unsigned long arg)
1543 {
1544 DECLARE_WAITQUEUE(wait, current);
1545 struct uart_icount cprev, cnow;
1546 struct hso_tiocmget *tiocmget;
1547 int ret;
1548
1549 tiocmget = serial->tiocmget;
1550 if (!tiocmget)
1551 return -ENOENT;
1552 /*
1553 * note the counters on entry
1554 */
1555 spin_lock_irq(&serial->serial_lock);
1556 memcpy(&cprev, &tiocmget->icount, sizeof(struct uart_icount));
1557 spin_unlock_irq(&serial->serial_lock);
1558 add_wait_queue(&tiocmget->waitq, &wait);
1559 for (;;) {
1560 spin_lock_irq(&serial->serial_lock);
1561 memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1562 spin_unlock_irq(&serial->serial_lock);
1563 set_current_state(TASK_INTERRUPTIBLE);
1564 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1565 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1566 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd))) {
1567 ret = 0;
1568 break;
1569 }
1570 schedule();
1571 /* see if a signal did it */
1572 if (signal_pending(current)) {
1573 ret = -ERESTARTSYS;
1574 break;
1575 }
1576 cprev = cnow;
1577 }
1578 __set_current_state(TASK_RUNNING);
1579 remove_wait_queue(&tiocmget->waitq, &wait);
1580
1581 return ret;
1582 }
1583
1584 /*
1585 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1586 * Return: write counters to the user passed counter struct
1587 * NB: both 1->0 and 0->1 transitions are counted except for
1588 * RI where only 0->1 is counted.
1589 */
hso_get_count(struct tty_struct * tty,struct serial_icounter_struct * icount)1590 static int hso_get_count(struct tty_struct *tty,
1591 struct serial_icounter_struct *icount)
1592 {
1593 struct uart_icount cnow;
1594 struct hso_serial *serial = tty->driver_data;
1595 struct hso_tiocmget *tiocmget = serial->tiocmget;
1596
1597 memset(icount, 0, sizeof(struct serial_icounter_struct));
1598
1599 if (!tiocmget)
1600 return -ENOENT;
1601 spin_lock_irq(&serial->serial_lock);
1602 memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1603 spin_unlock_irq(&serial->serial_lock);
1604
1605 icount->cts = cnow.cts;
1606 icount->dsr = cnow.dsr;
1607 icount->rng = cnow.rng;
1608 icount->dcd = cnow.dcd;
1609 icount->rx = cnow.rx;
1610 icount->tx = cnow.tx;
1611 icount->frame = cnow.frame;
1612 icount->overrun = cnow.overrun;
1613 icount->parity = cnow.parity;
1614 icount->brk = cnow.brk;
1615 icount->buf_overrun = cnow.buf_overrun;
1616
1617 return 0;
1618 }
1619
1620
hso_serial_tiocmget(struct tty_struct * tty)1621 static int hso_serial_tiocmget(struct tty_struct *tty)
1622 {
1623 int retval;
1624 struct hso_serial *serial = tty->driver_data;
1625 struct hso_tiocmget *tiocmget;
1626 u16 UART_state_bitmap;
1627
1628 /* sanity check */
1629 if (!serial) {
1630 hso_dbg(0x1, "no tty structures\n");
1631 return -EINVAL;
1632 }
1633 spin_lock_irq(&serial->serial_lock);
1634 retval = ((serial->rts_state) ? TIOCM_RTS : 0) |
1635 ((serial->dtr_state) ? TIOCM_DTR : 0);
1636 tiocmget = serial->tiocmget;
1637 if (tiocmget) {
1638
1639 UART_state_bitmap = le16_to_cpu(
1640 tiocmget->prev_UART_state_bitmap);
1641 if (UART_state_bitmap & B_RING_SIGNAL)
1642 retval |= TIOCM_RNG;
1643 if (UART_state_bitmap & B_RX_CARRIER)
1644 retval |= TIOCM_CD;
1645 if (UART_state_bitmap & B_TX_CARRIER)
1646 retval |= TIOCM_DSR;
1647 }
1648 spin_unlock_irq(&serial->serial_lock);
1649 return retval;
1650 }
1651
hso_serial_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)1652 static int hso_serial_tiocmset(struct tty_struct *tty,
1653 unsigned int set, unsigned int clear)
1654 {
1655 int val = 0;
1656 unsigned long flags;
1657 int if_num;
1658 struct hso_serial *serial = tty->driver_data;
1659 struct usb_interface *interface;
1660
1661 /* sanity check */
1662 if (!serial) {
1663 hso_dbg(0x1, "no tty structures\n");
1664 return -EINVAL;
1665 }
1666
1667 if ((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM)
1668 return -EINVAL;
1669
1670 interface = serial->parent->interface;
1671 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1672
1673 spin_lock_irqsave(&serial->serial_lock, flags);
1674 if (set & TIOCM_RTS)
1675 serial->rts_state = 1;
1676 if (set & TIOCM_DTR)
1677 serial->dtr_state = 1;
1678
1679 if (clear & TIOCM_RTS)
1680 serial->rts_state = 0;
1681 if (clear & TIOCM_DTR)
1682 serial->dtr_state = 0;
1683
1684 if (serial->dtr_state)
1685 val |= 0x01;
1686 if (serial->rts_state)
1687 val |= 0x02;
1688
1689 spin_unlock_irqrestore(&serial->serial_lock, flags);
1690
1691 return usb_control_msg(serial->parent->usb,
1692 usb_rcvctrlpipe(serial->parent->usb, 0), 0x22,
1693 0x21, val, if_num, NULL, 0,
1694 USB_CTRL_SET_TIMEOUT);
1695 }
1696
hso_serial_ioctl(struct tty_struct * tty,unsigned int cmd,unsigned long arg)1697 static int hso_serial_ioctl(struct tty_struct *tty,
1698 unsigned int cmd, unsigned long arg)
1699 {
1700 struct hso_serial *serial = tty->driver_data;
1701 int ret = 0;
1702 hso_dbg(0x8, "IOCTL cmd: %d, arg: %ld\n", cmd, arg);
1703
1704 if (!serial)
1705 return -ENODEV;
1706 switch (cmd) {
1707 case TIOCMIWAIT:
1708 ret = hso_wait_modem_status(serial, arg);
1709 break;
1710 default:
1711 ret = -ENOIOCTLCMD;
1712 break;
1713 }
1714 return ret;
1715 }
1716
1717
1718 /* starts a transmit */
hso_kick_transmit(struct hso_serial * serial)1719 static void hso_kick_transmit(struct hso_serial *serial)
1720 {
1721 unsigned long flags;
1722 int res;
1723
1724 spin_lock_irqsave(&serial->serial_lock, flags);
1725 if (!serial->tx_buffer_count)
1726 goto out;
1727
1728 if (serial->tx_urb_used)
1729 goto out;
1730
1731 /* Wakeup USB interface if necessary */
1732 if (hso_get_activity(serial->parent) == -EAGAIN)
1733 goto out;
1734
1735 /* Switch pointers around to avoid memcpy */
1736 swap(serial->tx_buffer, serial->tx_data);
1737 serial->tx_data_count = serial->tx_buffer_count;
1738 serial->tx_buffer_count = 0;
1739
1740 /* If serial->tx_data is set, it means we switched buffers */
1741 if (serial->tx_data && serial->write_data) {
1742 res = serial->write_data(serial);
1743 if (res >= 0)
1744 serial->tx_urb_used = 1;
1745 }
1746 out:
1747 spin_unlock_irqrestore(&serial->serial_lock, flags);
1748 }
1749
1750 /* make a request (for reading and writing data to muxed serial port) */
mux_device_request(struct hso_serial * serial,u8 type,u16 port,struct urb * ctrl_urb,struct usb_ctrlrequest * ctrl_req,u8 * ctrl_urb_data,u32 size)1751 static int mux_device_request(struct hso_serial *serial, u8 type, u16 port,
1752 struct urb *ctrl_urb,
1753 struct usb_ctrlrequest *ctrl_req,
1754 u8 *ctrl_urb_data, u32 size)
1755 {
1756 int result;
1757 int pipe;
1758
1759 /* Sanity check */
1760 if (!serial || !ctrl_urb || !ctrl_req) {
1761 pr_err("%s: Wrong arguments\n", __func__);
1762 return -EINVAL;
1763 }
1764
1765 /* initialize */
1766 ctrl_req->wValue = 0;
1767 ctrl_req->wIndex = cpu_to_le16(hso_port_to_mux(port));
1768 ctrl_req->wLength = cpu_to_le16(size);
1769
1770 if (type == USB_CDC_GET_ENCAPSULATED_RESPONSE) {
1771 /* Reading command */
1772 ctrl_req->bRequestType = USB_DIR_IN |
1773 USB_TYPE_OPTION_VENDOR |
1774 USB_RECIP_INTERFACE;
1775 ctrl_req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
1776 pipe = usb_rcvctrlpipe(serial->parent->usb, 0);
1777 } else {
1778 /* Writing command */
1779 ctrl_req->bRequestType = USB_DIR_OUT |
1780 USB_TYPE_OPTION_VENDOR |
1781 USB_RECIP_INTERFACE;
1782 ctrl_req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND;
1783 pipe = usb_sndctrlpipe(serial->parent->usb, 0);
1784 }
1785 /* syslog */
1786 hso_dbg(0x2, "%s command (%02x) len: %d, port: %d\n",
1787 type == USB_CDC_GET_ENCAPSULATED_RESPONSE ? "Read" : "Write",
1788 ctrl_req->bRequestType, ctrl_req->wLength, port);
1789
1790 /* Load ctrl urb */
1791 ctrl_urb->transfer_flags = 0;
1792 usb_fill_control_urb(ctrl_urb,
1793 serial->parent->usb,
1794 pipe,
1795 (u8 *) ctrl_req,
1796 ctrl_urb_data, size, ctrl_callback, serial);
1797 /* Send it on merry way */
1798 result = usb_submit_urb(ctrl_urb, GFP_ATOMIC);
1799 if (result) {
1800 dev_err(&ctrl_urb->dev->dev,
1801 "%s failed submit ctrl_urb %d type %d\n", __func__,
1802 result, type);
1803 return result;
1804 }
1805
1806 /* done */
1807 return size;
1808 }
1809
1810 /* called by intr_callback when read occurs */
hso_mux_serial_read(struct hso_serial * serial)1811 static int hso_mux_serial_read(struct hso_serial *serial)
1812 {
1813 if (!serial)
1814 return -EINVAL;
1815
1816 /* clean data */
1817 memset(serial->rx_data[0], 0, CTRL_URB_RX_SIZE);
1818 /* make the request */
1819
1820 if (serial->num_rx_urbs != 1) {
1821 dev_err(&serial->parent->interface->dev,
1822 "ERROR: mux'd reads with multiple buffers "
1823 "not possible\n");
1824 return 0;
1825 }
1826 return mux_device_request(serial,
1827 USB_CDC_GET_ENCAPSULATED_RESPONSE,
1828 serial->parent->port_spec & HSO_PORT_MASK,
1829 serial->rx_urb[0],
1830 &serial->ctrl_req_rx,
1831 serial->rx_data[0], serial->rx_data_length);
1832 }
1833
1834 /* used for muxed serial port callback (muxed serial read) */
intr_callback(struct urb * urb)1835 static void intr_callback(struct urb *urb)
1836 {
1837 struct hso_shared_int *shared_int = urb->context;
1838 struct hso_serial *serial;
1839 unsigned char *port_req;
1840 int status = urb->status;
1841 unsigned long flags;
1842 int i;
1843
1844 usb_mark_last_busy(urb->dev);
1845
1846 /* sanity check */
1847 if (!shared_int)
1848 return;
1849
1850 /* status check */
1851 if (status) {
1852 handle_usb_error(status, __func__, NULL);
1853 return;
1854 }
1855 hso_dbg(0x8, "--- Got intr callback 0x%02X ---\n", status);
1856
1857 /* what request? */
1858 port_req = urb->transfer_buffer;
1859 hso_dbg(0x8, "port_req = 0x%.2X\n", *port_req);
1860 /* loop over all muxed ports to find the one sending this */
1861 for (i = 0; i < 8; i++) {
1862 /* max 8 channels on MUX */
1863 if (*port_req & (1 << i)) {
1864 serial = get_serial_by_shared_int_and_type(shared_int,
1865 (1 << i));
1866 if (serial != NULL) {
1867 hso_dbg(0x1, "Pending read interrupt on port %d\n",
1868 i);
1869 spin_lock_irqsave(&serial->serial_lock, flags);
1870 if (serial->rx_state == RX_IDLE &&
1871 serial->port.count > 0) {
1872 /* Setup and send a ctrl req read on
1873 * port i */
1874 if (!serial->rx_urb_filled[0]) {
1875 serial->rx_state = RX_SENT;
1876 hso_mux_serial_read(serial);
1877 } else
1878 serial->rx_state = RX_PENDING;
1879 } else {
1880 hso_dbg(0x1, "Already a read pending on port %d or port not open\n",
1881 i);
1882 }
1883 spin_unlock_irqrestore(&serial->serial_lock,
1884 flags);
1885 }
1886 }
1887 }
1888 /* Resubmit interrupt urb */
1889 hso_mux_submit_intr_urb(shared_int, urb->dev, GFP_ATOMIC);
1890 }
1891
1892 /* called for writing to muxed serial port */
hso_mux_serial_write_data(struct hso_serial * serial)1893 static int hso_mux_serial_write_data(struct hso_serial *serial)
1894 {
1895 if (NULL == serial)
1896 return -EINVAL;
1897
1898 return mux_device_request(serial,
1899 USB_CDC_SEND_ENCAPSULATED_COMMAND,
1900 serial->parent->port_spec & HSO_PORT_MASK,
1901 serial->tx_urb,
1902 &serial->ctrl_req_tx,
1903 serial->tx_data, serial->tx_data_count);
1904 }
1905
1906 /* write callback for Diag and CS port */
hso_std_serial_write_bulk_callback(struct urb * urb)1907 static void hso_std_serial_write_bulk_callback(struct urb *urb)
1908 {
1909 struct hso_serial *serial = urb->context;
1910 int status = urb->status;
1911 unsigned long flags;
1912
1913 /* sanity check */
1914 if (!serial) {
1915 hso_dbg(0x1, "serial == NULL\n");
1916 return;
1917 }
1918
1919 spin_lock_irqsave(&serial->serial_lock, flags);
1920 serial->tx_urb_used = 0;
1921 spin_unlock_irqrestore(&serial->serial_lock, flags);
1922 if (status) {
1923 handle_usb_error(status, __func__, serial->parent);
1924 return;
1925 }
1926 hso_put_activity(serial->parent);
1927 tty_port_tty_wakeup(&serial->port);
1928 hso_kick_transmit(serial);
1929
1930 hso_dbg(0x1, "\n");
1931 }
1932
1933 /* called for writing diag or CS serial port */
hso_std_serial_write_data(struct hso_serial * serial)1934 static int hso_std_serial_write_data(struct hso_serial *serial)
1935 {
1936 int count = serial->tx_data_count;
1937 int result;
1938
1939 usb_fill_bulk_urb(serial->tx_urb,
1940 serial->parent->usb,
1941 usb_sndbulkpipe(serial->parent->usb,
1942 serial->out_endp->
1943 bEndpointAddress & 0x7F),
1944 serial->tx_data, serial->tx_data_count,
1945 hso_std_serial_write_bulk_callback, serial);
1946
1947 result = usb_submit_urb(serial->tx_urb, GFP_ATOMIC);
1948 if (result) {
1949 dev_warn(&serial->parent->usb->dev,
1950 "Failed to submit urb - res %d\n", result);
1951 return result;
1952 }
1953
1954 return count;
1955 }
1956
1957 /* callback after read or write on muxed serial port */
ctrl_callback(struct urb * urb)1958 static void ctrl_callback(struct urb *urb)
1959 {
1960 struct hso_serial *serial = urb->context;
1961 struct usb_ctrlrequest *req;
1962 int status = urb->status;
1963 unsigned long flags;
1964
1965 /* sanity check */
1966 if (!serial)
1967 return;
1968
1969 spin_lock_irqsave(&serial->serial_lock, flags);
1970 serial->tx_urb_used = 0;
1971 spin_unlock_irqrestore(&serial->serial_lock, flags);
1972 if (status) {
1973 handle_usb_error(status, __func__, serial->parent);
1974 return;
1975 }
1976
1977 /* what request? */
1978 req = (struct usb_ctrlrequest *)(urb->setup_packet);
1979 hso_dbg(0x8, "--- Got muxed ctrl callback 0x%02X ---\n", status);
1980 hso_dbg(0x8, "Actual length of urb = %d\n", urb->actual_length);
1981 DUMP1(urb->transfer_buffer, urb->actual_length);
1982
1983 if (req->bRequestType ==
1984 (USB_DIR_IN | USB_TYPE_OPTION_VENDOR | USB_RECIP_INTERFACE)) {
1985 /* response to a read command */
1986 serial->rx_urb_filled[0] = 1;
1987 spin_lock_irqsave(&serial->serial_lock, flags);
1988 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
1989 spin_unlock_irqrestore(&serial->serial_lock, flags);
1990 } else {
1991 hso_put_activity(serial->parent);
1992 tty_port_tty_wakeup(&serial->port);
1993 /* response to a write command */
1994 hso_kick_transmit(serial);
1995 }
1996 }
1997
1998 /* handle RX data for serial port */
put_rxbuf_data(struct urb * urb,struct hso_serial * serial)1999 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial)
2000 {
2001 struct tty_struct *tty;
2002 int count;
2003
2004 /* Sanity check */
2005 if (urb == NULL || serial == NULL) {
2006 hso_dbg(0x1, "serial = NULL\n");
2007 return -2;
2008 }
2009
2010 tty = tty_port_tty_get(&serial->port);
2011
2012 if (tty && tty_throttled(tty)) {
2013 tty_kref_put(tty);
2014 return -1;
2015 }
2016
2017 /* Push data to tty */
2018 hso_dbg(0x1, "data to push to tty\n");
2019 count = tty_buffer_request_room(&serial->port, urb->actual_length);
2020 if (count >= urb->actual_length) {
2021 tty_insert_flip_string(&serial->port, urb->transfer_buffer,
2022 urb->actual_length);
2023 tty_flip_buffer_push(&serial->port);
2024 } else {
2025 dev_warn(&serial->parent->usb->dev,
2026 "dropping data, %d bytes lost\n", urb->actual_length);
2027 }
2028
2029 tty_kref_put(tty);
2030
2031 serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 0;
2032
2033 return 0;
2034 }
2035
2036
2037 /* Base driver functions */
2038
hso_log_port(struct hso_device * hso_dev)2039 static void hso_log_port(struct hso_device *hso_dev)
2040 {
2041 char *port_type;
2042 char port_dev[20];
2043
2044 switch (hso_dev->port_spec & HSO_PORT_MASK) {
2045 case HSO_PORT_CONTROL:
2046 port_type = "Control";
2047 break;
2048 case HSO_PORT_APP:
2049 port_type = "Application";
2050 break;
2051 case HSO_PORT_GPS:
2052 port_type = "GPS";
2053 break;
2054 case HSO_PORT_GPS_CONTROL:
2055 port_type = "GPS control";
2056 break;
2057 case HSO_PORT_APP2:
2058 port_type = "Application2";
2059 break;
2060 case HSO_PORT_PCSC:
2061 port_type = "PCSC";
2062 break;
2063 case HSO_PORT_DIAG:
2064 port_type = "Diagnostic";
2065 break;
2066 case HSO_PORT_DIAG2:
2067 port_type = "Diagnostic2";
2068 break;
2069 case HSO_PORT_MODEM:
2070 port_type = "Modem";
2071 break;
2072 case HSO_PORT_NETWORK:
2073 port_type = "Network";
2074 break;
2075 default:
2076 port_type = "Unknown";
2077 break;
2078 }
2079 if ((hso_dev->port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2080 sprintf(port_dev, "%s", dev2net(hso_dev)->net->name);
2081 } else
2082 sprintf(port_dev, "/dev/%s%d", tty_filename,
2083 dev2ser(hso_dev)->minor);
2084
2085 dev_dbg(&hso_dev->interface->dev, "HSO: Found %s port %s\n",
2086 port_type, port_dev);
2087 }
2088
hso_start_net_device(struct hso_device * hso_dev)2089 static int hso_start_net_device(struct hso_device *hso_dev)
2090 {
2091 int i, result = 0;
2092 struct hso_net *hso_net = dev2net(hso_dev);
2093
2094 if (!hso_net)
2095 return -ENODEV;
2096
2097 /* send URBs for all read buffers */
2098 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2099
2100 /* Prep a receive URB */
2101 usb_fill_bulk_urb(hso_net->mux_bulk_rx_urb_pool[i],
2102 hso_dev->usb,
2103 usb_rcvbulkpipe(hso_dev->usb,
2104 hso_net->in_endp->
2105 bEndpointAddress & 0x7F),
2106 hso_net->mux_bulk_rx_buf_pool[i],
2107 MUX_BULK_RX_BUF_SIZE, read_bulk_callback,
2108 hso_net);
2109
2110 /* Put it out there so the device can send us stuff */
2111 result = usb_submit_urb(hso_net->mux_bulk_rx_urb_pool[i],
2112 GFP_NOIO);
2113 if (result)
2114 dev_warn(&hso_dev->usb->dev,
2115 "%s failed mux_bulk_rx_urb[%d] %d\n", __func__,
2116 i, result);
2117 }
2118
2119 return result;
2120 }
2121
hso_stop_net_device(struct hso_device * hso_dev)2122 static int hso_stop_net_device(struct hso_device *hso_dev)
2123 {
2124 int i;
2125 struct hso_net *hso_net = dev2net(hso_dev);
2126
2127 if (!hso_net)
2128 return -ENODEV;
2129
2130 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2131 if (hso_net->mux_bulk_rx_urb_pool[i])
2132 usb_kill_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2133
2134 }
2135 if (hso_net->mux_bulk_tx_urb)
2136 usb_kill_urb(hso_net->mux_bulk_tx_urb);
2137
2138 return 0;
2139 }
2140
hso_start_serial_device(struct hso_device * hso_dev,gfp_t flags)2141 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags)
2142 {
2143 int i, result = 0;
2144 struct hso_serial *serial = dev2ser(hso_dev);
2145
2146 if (!serial)
2147 return -ENODEV;
2148
2149 /* If it is not the MUX port fill in and submit a bulk urb (already
2150 * allocated in hso_serial_start) */
2151 if (!(serial->parent->port_spec & HSO_INTF_MUX)) {
2152 for (i = 0; i < serial->num_rx_urbs; i++) {
2153 usb_fill_bulk_urb(serial->rx_urb[i],
2154 serial->parent->usb,
2155 usb_rcvbulkpipe(serial->parent->usb,
2156 serial->in_endp->
2157 bEndpointAddress &
2158 0x7F),
2159 serial->rx_data[i],
2160 serial->rx_data_length,
2161 hso_std_serial_read_bulk_callback,
2162 serial);
2163 result = usb_submit_urb(serial->rx_urb[i], flags);
2164 if (result) {
2165 dev_warn(&serial->parent->usb->dev,
2166 "Failed to submit urb - res %d\n",
2167 result);
2168 break;
2169 }
2170 }
2171 } else {
2172 mutex_lock(&serial->shared_int->shared_int_lock);
2173 if (!serial->shared_int->use_count) {
2174 result =
2175 hso_mux_submit_intr_urb(serial->shared_int,
2176 hso_dev->usb, flags);
2177 }
2178 serial->shared_int->use_count++;
2179 mutex_unlock(&serial->shared_int->shared_int_lock);
2180 }
2181 if (serial->tiocmget)
2182 tiocmget_submit_urb(serial,
2183 serial->tiocmget,
2184 serial->parent->usb);
2185 return result;
2186 }
2187
hso_stop_serial_device(struct hso_device * hso_dev)2188 static int hso_stop_serial_device(struct hso_device *hso_dev)
2189 {
2190 int i;
2191 struct hso_serial *serial = dev2ser(hso_dev);
2192 struct hso_tiocmget *tiocmget;
2193
2194 if (!serial)
2195 return -ENODEV;
2196
2197 for (i = 0; i < serial->num_rx_urbs; i++) {
2198 if (serial->rx_urb[i]) {
2199 usb_kill_urb(serial->rx_urb[i]);
2200 serial->rx_urb_filled[i] = 0;
2201 }
2202 }
2203 serial->curr_rx_urb_idx = 0;
2204
2205 if (serial->tx_urb)
2206 usb_kill_urb(serial->tx_urb);
2207
2208 if (serial->shared_int) {
2209 mutex_lock(&serial->shared_int->shared_int_lock);
2210 if (serial->shared_int->use_count &&
2211 (--serial->shared_int->use_count == 0)) {
2212 struct urb *urb;
2213
2214 urb = serial->shared_int->shared_intr_urb;
2215 if (urb)
2216 usb_kill_urb(urb);
2217 }
2218 mutex_unlock(&serial->shared_int->shared_int_lock);
2219 }
2220 tiocmget = serial->tiocmget;
2221 if (tiocmget) {
2222 wake_up_interruptible(&tiocmget->waitq);
2223 usb_kill_urb(tiocmget->urb);
2224 }
2225
2226 return 0;
2227 }
2228
hso_serial_tty_unregister(struct hso_serial * serial)2229 static void hso_serial_tty_unregister(struct hso_serial *serial)
2230 {
2231 tty_unregister_device(tty_drv, serial->minor);
2232 release_minor(serial);
2233 }
2234
hso_serial_common_free(struct hso_serial * serial)2235 static void hso_serial_common_free(struct hso_serial *serial)
2236 {
2237 int i;
2238
2239 for (i = 0; i < serial->num_rx_urbs; i++) {
2240 /* unlink and free RX URB */
2241 usb_free_urb(serial->rx_urb[i]);
2242 /* free the RX buffer */
2243 kfree(serial->rx_data[i]);
2244 }
2245
2246 /* unlink and free TX URB */
2247 usb_free_urb(serial->tx_urb);
2248 kfree(serial->tx_buffer);
2249 kfree(serial->tx_data);
2250 tty_port_destroy(&serial->port);
2251 }
2252
hso_serial_common_create(struct hso_serial * serial,int num_urbs,int rx_size,int tx_size)2253 static int hso_serial_common_create(struct hso_serial *serial, int num_urbs,
2254 int rx_size, int tx_size)
2255 {
2256 int i;
2257
2258 tty_port_init(&serial->port);
2259
2260 if (obtain_minor(serial))
2261 goto exit2;
2262
2263 /* register our minor number */
2264 serial->parent->dev = tty_port_register_device_attr(&serial->port,
2265 tty_drv, serial->minor, &serial->parent->interface->dev,
2266 serial->parent, hso_serial_dev_groups);
2267 if (IS_ERR(serial->parent->dev)) {
2268 release_minor(serial);
2269 goto exit2;
2270 }
2271
2272 serial->magic = HSO_SERIAL_MAGIC;
2273 spin_lock_init(&serial->serial_lock);
2274 serial->num_rx_urbs = num_urbs;
2275
2276 /* RX, allocate urb and initialize */
2277
2278 /* prepare our RX buffer */
2279 serial->rx_data_length = rx_size;
2280 for (i = 0; i < serial->num_rx_urbs; i++) {
2281 serial->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
2282 if (!serial->rx_urb[i])
2283 goto exit;
2284 serial->rx_urb[i]->transfer_buffer = NULL;
2285 serial->rx_urb[i]->transfer_buffer_length = 0;
2286 serial->rx_data[i] = kzalloc(serial->rx_data_length,
2287 GFP_KERNEL);
2288 if (!serial->rx_data[i])
2289 goto exit;
2290 }
2291
2292 /* TX, allocate urb and initialize */
2293 serial->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2294 if (!serial->tx_urb)
2295 goto exit;
2296 serial->tx_urb->transfer_buffer = NULL;
2297 serial->tx_urb->transfer_buffer_length = 0;
2298 /* prepare our TX buffer */
2299 serial->tx_data_count = 0;
2300 serial->tx_buffer_count = 0;
2301 serial->tx_data_length = tx_size;
2302 serial->tx_data = kzalloc(serial->tx_data_length, GFP_KERNEL);
2303 if (!serial->tx_data)
2304 goto exit;
2305
2306 serial->tx_buffer = kzalloc(serial->tx_data_length, GFP_KERNEL);
2307 if (!serial->tx_buffer)
2308 goto exit;
2309
2310 return 0;
2311 exit:
2312 hso_serial_tty_unregister(serial);
2313 exit2:
2314 hso_serial_common_free(serial);
2315 return -1;
2316 }
2317
2318 /* Creates a general hso device */
hso_create_device(struct usb_interface * intf,int port_spec)2319 static struct hso_device *hso_create_device(struct usb_interface *intf,
2320 int port_spec)
2321 {
2322 struct hso_device *hso_dev;
2323
2324 hso_dev = kzalloc(sizeof(*hso_dev), GFP_ATOMIC);
2325 if (!hso_dev)
2326 return NULL;
2327
2328 hso_dev->port_spec = port_spec;
2329 hso_dev->usb = interface_to_usbdev(intf);
2330 hso_dev->interface = intf;
2331 kref_init(&hso_dev->ref);
2332 mutex_init(&hso_dev->mutex);
2333
2334 INIT_WORK(&hso_dev->async_get_intf, async_get_intf);
2335 INIT_WORK(&hso_dev->async_put_intf, async_put_intf);
2336
2337 return hso_dev;
2338 }
2339
2340 /* Removes a network device in the network device table */
remove_net_device(struct hso_device * hso_dev)2341 static int remove_net_device(struct hso_device *hso_dev)
2342 {
2343 int i;
2344
2345 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2346 if (network_table[i] == hso_dev) {
2347 network_table[i] = NULL;
2348 break;
2349 }
2350 }
2351 if (i == HSO_MAX_NET_DEVICES)
2352 return -1;
2353 return 0;
2354 }
2355
2356 /* Frees our network device */
hso_free_net_device(struct hso_device * hso_dev,bool bailout)2357 static void hso_free_net_device(struct hso_device *hso_dev, bool bailout)
2358 {
2359 int i;
2360 struct hso_net *hso_net = dev2net(hso_dev);
2361
2362 if (!hso_net)
2363 return;
2364
2365 remove_net_device(hso_net->parent);
2366
2367 if (hso_net->net)
2368 unregister_netdev(hso_net->net);
2369
2370 /* start freeing */
2371 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2372 usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2373 kfree(hso_net->mux_bulk_rx_buf_pool[i]);
2374 hso_net->mux_bulk_rx_buf_pool[i] = NULL;
2375 }
2376 usb_free_urb(hso_net->mux_bulk_tx_urb);
2377 kfree(hso_net->mux_bulk_tx_buf);
2378 hso_net->mux_bulk_tx_buf = NULL;
2379
2380 if (hso_net->net && !bailout)
2381 free_netdev(hso_net->net);
2382
2383 kfree(hso_dev);
2384 }
2385
2386 static const struct net_device_ops hso_netdev_ops = {
2387 .ndo_open = hso_net_open,
2388 .ndo_stop = hso_net_close,
2389 .ndo_start_xmit = hso_net_start_xmit,
2390 .ndo_tx_timeout = hso_net_tx_timeout,
2391 };
2392
2393 /* initialize the network interface */
hso_net_init(struct net_device * net)2394 static void hso_net_init(struct net_device *net)
2395 {
2396 struct hso_net *hso_net = netdev_priv(net);
2397
2398 hso_dbg(0x1, "sizeof hso_net is %zu\n", sizeof(*hso_net));
2399
2400 /* fill in the other fields */
2401 net->netdev_ops = &hso_netdev_ops;
2402 net->watchdog_timeo = HSO_NET_TX_TIMEOUT;
2403 net->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2404 net->type = ARPHRD_NONE;
2405 net->mtu = DEFAULT_MTU - 14;
2406 net->tx_queue_len = 10;
2407 net->ethtool_ops = &ops;
2408
2409 /* and initialize the semaphore */
2410 spin_lock_init(&hso_net->net_lock);
2411 }
2412
2413 /* Adds a network device in the network device table */
add_net_device(struct hso_device * hso_dev)2414 static int add_net_device(struct hso_device *hso_dev)
2415 {
2416 int i;
2417
2418 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2419 if (network_table[i] == NULL) {
2420 network_table[i] = hso_dev;
2421 break;
2422 }
2423 }
2424 if (i == HSO_MAX_NET_DEVICES)
2425 return -1;
2426 return 0;
2427 }
2428
hso_rfkill_set_block(void * data,bool blocked)2429 static int hso_rfkill_set_block(void *data, bool blocked)
2430 {
2431 struct hso_device *hso_dev = data;
2432 int enabled = !blocked;
2433 int rv;
2434
2435 mutex_lock(&hso_dev->mutex);
2436 if (hso_dev->usb_gone)
2437 rv = 0;
2438 else
2439 rv = usb_control_msg(hso_dev->usb, usb_rcvctrlpipe(hso_dev->usb, 0),
2440 enabled ? 0x82 : 0x81, 0x40, 0, 0, NULL, 0,
2441 USB_CTRL_SET_TIMEOUT);
2442 mutex_unlock(&hso_dev->mutex);
2443 return rv;
2444 }
2445
2446 static const struct rfkill_ops hso_rfkill_ops = {
2447 .set_block = hso_rfkill_set_block,
2448 };
2449
2450 /* Creates and sets up everything for rfkill */
hso_create_rfkill(struct hso_device * hso_dev,struct usb_interface * interface)2451 static void hso_create_rfkill(struct hso_device *hso_dev,
2452 struct usb_interface *interface)
2453 {
2454 struct hso_net *hso_net = dev2net(hso_dev);
2455 struct device *dev = &hso_net->net->dev;
2456 static u32 rfkill_counter;
2457
2458 snprintf(hso_net->name, sizeof(hso_net->name), "hso-%d",
2459 rfkill_counter++);
2460
2461 hso_net->rfkill = rfkill_alloc(hso_net->name,
2462 &interface_to_usbdev(interface)->dev,
2463 RFKILL_TYPE_WWAN,
2464 &hso_rfkill_ops, hso_dev);
2465 if (!hso_net->rfkill)
2466 return;
2467
2468 if (rfkill_register(hso_net->rfkill) < 0) {
2469 rfkill_destroy(hso_net->rfkill);
2470 hso_net->rfkill = NULL;
2471 dev_err(dev, "%s - Failed to register rfkill\n", __func__);
2472 return;
2473 }
2474 }
2475
2476 static struct device_type hso_type = {
2477 .name = "wwan",
2478 };
2479
2480 /* Creates our network device */
hso_create_net_device(struct usb_interface * interface,int port_spec)2481 static struct hso_device *hso_create_net_device(struct usb_interface *interface,
2482 int port_spec)
2483 {
2484 int result, i;
2485 struct net_device *net;
2486 struct hso_net *hso_net;
2487 struct hso_device *hso_dev;
2488
2489 hso_dev = hso_create_device(interface, port_spec);
2490 if (!hso_dev)
2491 return NULL;
2492
2493 /* allocate our network device, then we can put in our private data */
2494 /* call hso_net_init to do the basic initialization */
2495 net = alloc_netdev(sizeof(struct hso_net), "hso%d", NET_NAME_UNKNOWN,
2496 hso_net_init);
2497 if (!net) {
2498 dev_err(&interface->dev, "Unable to create ethernet device\n");
2499 goto exit;
2500 }
2501
2502 hso_net = netdev_priv(net);
2503
2504 hso_dev->port_data.dev_net = hso_net;
2505 hso_net->net = net;
2506 hso_net->parent = hso_dev;
2507
2508 hso_net->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2509 USB_DIR_IN);
2510 if (!hso_net->in_endp) {
2511 dev_err(&interface->dev, "Can't find BULK IN endpoint\n");
2512 goto exit;
2513 }
2514 hso_net->out_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2515 USB_DIR_OUT);
2516 if (!hso_net->out_endp) {
2517 dev_err(&interface->dev, "Can't find BULK OUT endpoint\n");
2518 goto exit;
2519 }
2520 SET_NETDEV_DEV(net, &interface->dev);
2521 SET_NETDEV_DEVTYPE(net, &hso_type);
2522
2523 /* start allocating */
2524 for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2525 hso_net->mux_bulk_rx_urb_pool[i] = usb_alloc_urb(0, GFP_KERNEL);
2526 if (!hso_net->mux_bulk_rx_urb_pool[i])
2527 goto exit;
2528 hso_net->mux_bulk_rx_buf_pool[i] = kzalloc(MUX_BULK_RX_BUF_SIZE,
2529 GFP_KERNEL);
2530 if (!hso_net->mux_bulk_rx_buf_pool[i])
2531 goto exit;
2532 }
2533 hso_net->mux_bulk_tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2534 if (!hso_net->mux_bulk_tx_urb)
2535 goto exit;
2536 hso_net->mux_bulk_tx_buf = kzalloc(MUX_BULK_TX_BUF_SIZE, GFP_KERNEL);
2537 if (!hso_net->mux_bulk_tx_buf)
2538 goto exit;
2539
2540 add_net_device(hso_dev);
2541
2542 /* registering our net device */
2543 result = register_netdev(net);
2544 if (result) {
2545 dev_err(&interface->dev, "Failed to register device\n");
2546 goto exit;
2547 }
2548
2549 hso_log_port(hso_dev);
2550
2551 hso_create_rfkill(hso_dev, interface);
2552
2553 return hso_dev;
2554 exit:
2555 hso_free_net_device(hso_dev, true);
2556 return NULL;
2557 }
2558
hso_free_tiomget(struct hso_serial * serial)2559 static void hso_free_tiomget(struct hso_serial *serial)
2560 {
2561 struct hso_tiocmget *tiocmget;
2562 if (!serial)
2563 return;
2564 tiocmget = serial->tiocmget;
2565 if (tiocmget) {
2566 usb_free_urb(tiocmget->urb);
2567 tiocmget->urb = NULL;
2568 serial->tiocmget = NULL;
2569 kfree(tiocmget->serial_state_notification);
2570 tiocmget->serial_state_notification = NULL;
2571 kfree(tiocmget);
2572 }
2573 }
2574
2575 /* Frees an AT channel ( goes for both mux and non-mux ) */
hso_free_serial_device(struct hso_device * hso_dev)2576 static void hso_free_serial_device(struct hso_device *hso_dev)
2577 {
2578 struct hso_serial *serial = dev2ser(hso_dev);
2579
2580 if (!serial)
2581 return;
2582
2583 hso_serial_common_free(serial);
2584
2585 if (serial->shared_int) {
2586 mutex_lock(&serial->shared_int->shared_int_lock);
2587 if (--serial->shared_int->ref_count == 0)
2588 hso_free_shared_int(serial->shared_int);
2589 else
2590 mutex_unlock(&serial->shared_int->shared_int_lock);
2591 }
2592 hso_free_tiomget(serial);
2593 kfree(serial);
2594 kfree(hso_dev);
2595 }
2596
2597 /* Creates a bulk AT channel */
hso_create_bulk_serial_device(struct usb_interface * interface,int port)2598 static struct hso_device *hso_create_bulk_serial_device(
2599 struct usb_interface *interface, int port)
2600 {
2601 struct hso_device *hso_dev;
2602 struct hso_serial *serial;
2603 int num_urbs;
2604 struct hso_tiocmget *tiocmget;
2605
2606 hso_dev = hso_create_device(interface, port);
2607 if (!hso_dev)
2608 return NULL;
2609
2610 serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2611 if (!serial)
2612 goto exit;
2613
2614 serial->parent = hso_dev;
2615 hso_dev->port_data.dev_serial = serial;
2616
2617 if ((port & HSO_PORT_MASK) == HSO_PORT_MODEM) {
2618 num_urbs = 2;
2619 serial->tiocmget = kzalloc(sizeof(struct hso_tiocmget),
2620 GFP_KERNEL);
2621 serial->tiocmget->serial_state_notification
2622 = kzalloc(sizeof(struct hso_serial_state_notification),
2623 GFP_KERNEL);
2624 /* it isn't going to break our heart if serial->tiocmget
2625 * allocation fails don't bother checking this.
2626 */
2627 if (serial->tiocmget && serial->tiocmget->serial_state_notification) {
2628 tiocmget = serial->tiocmget;
2629 tiocmget->endp = hso_get_ep(interface,
2630 USB_ENDPOINT_XFER_INT,
2631 USB_DIR_IN);
2632 if (!tiocmget->endp) {
2633 dev_err(&interface->dev, "Failed to find INT IN ep\n");
2634 goto exit;
2635 }
2636
2637 tiocmget->urb = usb_alloc_urb(0, GFP_KERNEL);
2638 if (tiocmget->urb) {
2639 mutex_init(&tiocmget->mutex);
2640 init_waitqueue_head(&tiocmget->waitq);
2641 } else
2642 hso_free_tiomget(serial);
2643 }
2644 }
2645 else
2646 num_urbs = 1;
2647
2648 if (hso_serial_common_create(serial, num_urbs, BULK_URB_RX_SIZE,
2649 BULK_URB_TX_SIZE))
2650 goto exit;
2651
2652 serial->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2653 USB_DIR_IN);
2654 if (!serial->in_endp) {
2655 dev_err(&interface->dev, "Failed to find BULK IN ep\n");
2656 goto exit2;
2657 }
2658
2659 if (!
2660 (serial->out_endp =
2661 hso_get_ep(interface, USB_ENDPOINT_XFER_BULK, USB_DIR_OUT))) {
2662 dev_err(&interface->dev, "Failed to find BULK OUT ep\n");
2663 goto exit2;
2664 }
2665
2666 serial->write_data = hso_std_serial_write_data;
2667
2668 /* setup the proc dirs and files if needed */
2669 hso_log_port(hso_dev);
2670
2671 /* done, return it */
2672 return hso_dev;
2673
2674 exit2:
2675 hso_serial_tty_unregister(serial);
2676 hso_serial_common_free(serial);
2677 exit:
2678 hso_free_tiomget(serial);
2679 kfree(serial);
2680 kfree(hso_dev);
2681 return NULL;
2682 }
2683
2684 /* Creates a multiplexed AT channel */
2685 static
hso_create_mux_serial_device(struct usb_interface * interface,int port,struct hso_shared_int * mux)2686 struct hso_device *hso_create_mux_serial_device(struct usb_interface *interface,
2687 int port,
2688 struct hso_shared_int *mux)
2689 {
2690 struct hso_device *hso_dev;
2691 struct hso_serial *serial;
2692 int port_spec;
2693
2694 port_spec = HSO_INTF_MUX;
2695 port_spec &= ~HSO_PORT_MASK;
2696
2697 port_spec |= hso_mux_to_port(port);
2698 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NO_PORT)
2699 return NULL;
2700
2701 hso_dev = hso_create_device(interface, port_spec);
2702 if (!hso_dev)
2703 return NULL;
2704
2705 serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2706 if (!serial)
2707 goto exit;
2708
2709 hso_dev->port_data.dev_serial = serial;
2710 serial->parent = hso_dev;
2711
2712 if (hso_serial_common_create
2713 (serial, 1, CTRL_URB_RX_SIZE, CTRL_URB_TX_SIZE))
2714 goto exit;
2715
2716 serial->tx_data_length--;
2717 serial->write_data = hso_mux_serial_write_data;
2718
2719 serial->shared_int = mux;
2720 mutex_lock(&serial->shared_int->shared_int_lock);
2721 serial->shared_int->ref_count++;
2722 mutex_unlock(&serial->shared_int->shared_int_lock);
2723
2724 /* setup the proc dirs and files if needed */
2725 hso_log_port(hso_dev);
2726
2727 /* done, return it */
2728 return hso_dev;
2729
2730 exit:
2731 if (serial) {
2732 tty_unregister_device(tty_drv, serial->minor);
2733 kfree(serial);
2734 }
2735 kfree(hso_dev);
2736 return NULL;
2737
2738 }
2739
hso_free_shared_int(struct hso_shared_int * mux)2740 static void hso_free_shared_int(struct hso_shared_int *mux)
2741 {
2742 usb_free_urb(mux->shared_intr_urb);
2743 kfree(mux->shared_intr_buf);
2744 mutex_unlock(&mux->shared_int_lock);
2745 kfree(mux);
2746 }
2747
2748 static
hso_create_shared_int(struct usb_interface * interface)2749 struct hso_shared_int *hso_create_shared_int(struct usb_interface *interface)
2750 {
2751 struct hso_shared_int *mux = kzalloc(sizeof(*mux), GFP_KERNEL);
2752
2753 if (!mux)
2754 return NULL;
2755
2756 mux->intr_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_INT,
2757 USB_DIR_IN);
2758 if (!mux->intr_endp) {
2759 dev_err(&interface->dev, "Can't find INT IN endpoint\n");
2760 goto exit;
2761 }
2762
2763 mux->shared_intr_urb = usb_alloc_urb(0, GFP_KERNEL);
2764 if (!mux->shared_intr_urb)
2765 goto exit;
2766 mux->shared_intr_buf =
2767 kzalloc(le16_to_cpu(mux->intr_endp->wMaxPacketSize),
2768 GFP_KERNEL);
2769 if (!mux->shared_intr_buf)
2770 goto exit;
2771
2772 mutex_init(&mux->shared_int_lock);
2773
2774 return mux;
2775
2776 exit:
2777 kfree(mux->shared_intr_buf);
2778 usb_free_urb(mux->shared_intr_urb);
2779 kfree(mux);
2780 return NULL;
2781 }
2782
2783 /* Gets the port spec for a certain interface */
hso_get_config_data(struct usb_interface * interface)2784 static int hso_get_config_data(struct usb_interface *interface)
2785 {
2786 struct usb_device *usbdev = interface_to_usbdev(interface);
2787 u8 *config_data = kmalloc(17, GFP_KERNEL);
2788 u32 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2789 s32 result;
2790
2791 if (!config_data)
2792 return -ENOMEM;
2793 if (usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
2794 0x86, 0xC0, 0, 0, config_data, 17,
2795 USB_CTRL_SET_TIMEOUT) != 0x11) {
2796 kfree(config_data);
2797 return -EIO;
2798 }
2799
2800 /* check if we have a valid interface */
2801 if (if_num > 16) {
2802 kfree(config_data);
2803 return -EINVAL;
2804 }
2805
2806 switch (config_data[if_num]) {
2807 case 0x0:
2808 result = 0;
2809 break;
2810 case 0x1:
2811 result = HSO_PORT_DIAG;
2812 break;
2813 case 0x2:
2814 result = HSO_PORT_GPS;
2815 break;
2816 case 0x3:
2817 result = HSO_PORT_GPS_CONTROL;
2818 break;
2819 case 0x4:
2820 result = HSO_PORT_APP;
2821 break;
2822 case 0x5:
2823 result = HSO_PORT_APP2;
2824 break;
2825 case 0x6:
2826 result = HSO_PORT_CONTROL;
2827 break;
2828 case 0x7:
2829 result = HSO_PORT_NETWORK;
2830 break;
2831 case 0x8:
2832 result = HSO_PORT_MODEM;
2833 break;
2834 case 0x9:
2835 result = HSO_PORT_MSD;
2836 break;
2837 case 0xa:
2838 result = HSO_PORT_PCSC;
2839 break;
2840 case 0xb:
2841 result = HSO_PORT_VOICE;
2842 break;
2843 default:
2844 result = 0;
2845 }
2846
2847 if (result)
2848 result |= HSO_INTF_BULK;
2849
2850 if (config_data[16] & 0x1)
2851 result |= HSO_INFO_CRC_BUG;
2852
2853 kfree(config_data);
2854 return result;
2855 }
2856
2857 /* called once for each interface upon device insertion */
hso_probe(struct usb_interface * interface,const struct usb_device_id * id)2858 static int hso_probe(struct usb_interface *interface,
2859 const struct usb_device_id *id)
2860 {
2861 int mux, i, if_num, port_spec;
2862 unsigned char port_mask;
2863 struct hso_device *hso_dev = NULL;
2864 struct hso_shared_int *shared_int;
2865 struct hso_device *tmp_dev = NULL;
2866
2867 if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
2868 dev_err(&interface->dev, "Not our interface\n");
2869 return -ENODEV;
2870 }
2871
2872 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2873
2874 /* Get the interface/port specification from either driver_info or from
2875 * the device itself */
2876 if (id->driver_info) {
2877 /* if_num is controlled by the device, driver_info is a 0 terminated
2878 * array. Make sure, the access is in bounds! */
2879 for (i = 0; i <= if_num; ++i)
2880 if (((u32 *)(id->driver_info))[i] == 0)
2881 goto exit;
2882 port_spec = ((u32 *)(id->driver_info))[if_num];
2883 } else {
2884 port_spec = hso_get_config_data(interface);
2885 if (port_spec < 0)
2886 goto exit;
2887 }
2888
2889 /* Check if we need to switch to alt interfaces prior to port
2890 * configuration */
2891 if (interface->num_altsetting > 1)
2892 usb_set_interface(interface_to_usbdev(interface), if_num, 1);
2893 interface->needs_remote_wakeup = 1;
2894
2895 /* Allocate new hso device(s) */
2896 switch (port_spec & HSO_INTF_MASK) {
2897 case HSO_INTF_MUX:
2898 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2899 /* Create the network device */
2900 if (!disable_net) {
2901 hso_dev = hso_create_net_device(interface,
2902 port_spec);
2903 if (!hso_dev)
2904 goto exit;
2905 tmp_dev = hso_dev;
2906 }
2907 }
2908
2909 if (hso_get_mux_ports(interface, &port_mask))
2910 /* TODO: de-allocate everything */
2911 goto exit;
2912
2913 shared_int = hso_create_shared_int(interface);
2914 if (!shared_int)
2915 goto exit;
2916
2917 for (i = 1, mux = 0; i < 0x100; i = i << 1, mux++) {
2918 if (port_mask & i) {
2919 hso_dev = hso_create_mux_serial_device(
2920 interface, i, shared_int);
2921 if (!hso_dev)
2922 goto exit;
2923 }
2924 }
2925
2926 if (tmp_dev)
2927 hso_dev = tmp_dev;
2928 break;
2929
2930 case HSO_INTF_BULK:
2931 /* It's a regular bulk interface */
2932 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2933 if (!disable_net)
2934 hso_dev =
2935 hso_create_net_device(interface, port_spec);
2936 } else {
2937 hso_dev =
2938 hso_create_bulk_serial_device(interface, port_spec);
2939 }
2940 if (!hso_dev)
2941 goto exit;
2942 break;
2943 default:
2944 goto exit;
2945 }
2946
2947 /* save our data pointer in this device */
2948 usb_set_intfdata(interface, hso_dev);
2949
2950 /* done */
2951 return 0;
2952 exit:
2953 hso_free_interface(interface);
2954 return -ENODEV;
2955 }
2956
2957 /* device removed, cleaning up */
hso_disconnect(struct usb_interface * interface)2958 static void hso_disconnect(struct usb_interface *interface)
2959 {
2960 hso_free_interface(interface);
2961
2962 /* remove reference of our private data */
2963 usb_set_intfdata(interface, NULL);
2964 }
2965
async_get_intf(struct work_struct * data)2966 static void async_get_intf(struct work_struct *data)
2967 {
2968 struct hso_device *hso_dev =
2969 container_of(data, struct hso_device, async_get_intf);
2970 usb_autopm_get_interface(hso_dev->interface);
2971 }
2972
async_put_intf(struct work_struct * data)2973 static void async_put_intf(struct work_struct *data)
2974 {
2975 struct hso_device *hso_dev =
2976 container_of(data, struct hso_device, async_put_intf);
2977 usb_autopm_put_interface(hso_dev->interface);
2978 }
2979
hso_get_activity(struct hso_device * hso_dev)2980 static int hso_get_activity(struct hso_device *hso_dev)
2981 {
2982 if (hso_dev->usb->state == USB_STATE_SUSPENDED) {
2983 if (!hso_dev->is_active) {
2984 hso_dev->is_active = 1;
2985 schedule_work(&hso_dev->async_get_intf);
2986 }
2987 }
2988
2989 if (hso_dev->usb->state != USB_STATE_CONFIGURED)
2990 return -EAGAIN;
2991
2992 usb_mark_last_busy(hso_dev->usb);
2993
2994 return 0;
2995 }
2996
hso_put_activity(struct hso_device * hso_dev)2997 static int hso_put_activity(struct hso_device *hso_dev)
2998 {
2999 if (hso_dev->usb->state != USB_STATE_SUSPENDED) {
3000 if (hso_dev->is_active) {
3001 hso_dev->is_active = 0;
3002 schedule_work(&hso_dev->async_put_intf);
3003 return -EAGAIN;
3004 }
3005 }
3006 hso_dev->is_active = 0;
3007 return 0;
3008 }
3009
3010 /* called by kernel when we need to suspend device */
hso_suspend(struct usb_interface * iface,pm_message_t message)3011 static int hso_suspend(struct usb_interface *iface, pm_message_t message)
3012 {
3013 int i, result;
3014
3015 /* Stop all serial ports */
3016 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3017 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3018 result = hso_stop_serial_device(serial_table[i]);
3019 if (result)
3020 goto out;
3021 }
3022 }
3023
3024 /* Stop all network ports */
3025 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3026 if (network_table[i] &&
3027 (network_table[i]->interface == iface)) {
3028 result = hso_stop_net_device(network_table[i]);
3029 if (result)
3030 goto out;
3031 }
3032 }
3033
3034 out:
3035 return 0;
3036 }
3037
3038 /* called by kernel when we need to resume device */
hso_resume(struct usb_interface * iface)3039 static int hso_resume(struct usb_interface *iface)
3040 {
3041 int i, result = 0;
3042 struct hso_net *hso_net;
3043
3044 /* Start all serial ports */
3045 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3046 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3047 if (dev2ser(serial_table[i])->port.count) {
3048 result =
3049 hso_start_serial_device(serial_table[i], GFP_NOIO);
3050 hso_kick_transmit(dev2ser(serial_table[i]));
3051 if (result)
3052 goto out;
3053 }
3054 }
3055 }
3056
3057 /* Start all network ports */
3058 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3059 if (network_table[i] &&
3060 (network_table[i]->interface == iface)) {
3061 hso_net = dev2net(network_table[i]);
3062 if (hso_net->flags & IFF_UP) {
3063 /* First transmit any lingering data,
3064 then restart the device. */
3065 if (hso_net->skb_tx_buf) {
3066 dev_dbg(&iface->dev,
3067 "Transmitting"
3068 " lingering data\n");
3069 hso_net_start_xmit(hso_net->skb_tx_buf,
3070 hso_net->net);
3071 hso_net->skb_tx_buf = NULL;
3072 }
3073 result = hso_start_net_device(network_table[i]);
3074 if (result)
3075 goto out;
3076 }
3077 }
3078 }
3079
3080 out:
3081 return result;
3082 }
3083
hso_serial_ref_free(struct kref * ref)3084 static void hso_serial_ref_free(struct kref *ref)
3085 {
3086 struct hso_device *hso_dev = container_of(ref, struct hso_device, ref);
3087
3088 hso_free_serial_device(hso_dev);
3089 }
3090
hso_free_interface(struct usb_interface * interface)3091 static void hso_free_interface(struct usb_interface *interface)
3092 {
3093 struct hso_serial *serial;
3094 int i;
3095
3096 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3097 if (serial_table[i] &&
3098 (serial_table[i]->interface == interface)) {
3099 serial = dev2ser(serial_table[i]);
3100 tty_port_tty_hangup(&serial->port, false);
3101 mutex_lock(&serial->parent->mutex);
3102 serial->parent->usb_gone = 1;
3103 mutex_unlock(&serial->parent->mutex);
3104 cancel_work_sync(&serial_table[i]->async_put_intf);
3105 cancel_work_sync(&serial_table[i]->async_get_intf);
3106 hso_serial_tty_unregister(serial);
3107 kref_put(&serial->parent->ref, hso_serial_ref_free);
3108 }
3109 }
3110
3111 for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3112 if (network_table[i] &&
3113 (network_table[i]->interface == interface)) {
3114 struct rfkill *rfk = dev2net(network_table[i])->rfkill;
3115 /* hso_stop_net_device doesn't stop the net queue since
3116 * traffic needs to start it again when suspended */
3117 netif_stop_queue(dev2net(network_table[i])->net);
3118 hso_stop_net_device(network_table[i]);
3119 cancel_work_sync(&network_table[i]->async_put_intf);
3120 cancel_work_sync(&network_table[i]->async_get_intf);
3121 if (rfk) {
3122 rfkill_unregister(rfk);
3123 rfkill_destroy(rfk);
3124 }
3125 hso_free_net_device(network_table[i], false);
3126 }
3127 }
3128 }
3129
3130 /* Helper functions */
3131
3132 /* Get the endpoint ! */
hso_get_ep(struct usb_interface * intf,int type,int dir)3133 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
3134 int type, int dir)
3135 {
3136 int i;
3137 struct usb_host_interface *iface = intf->cur_altsetting;
3138 struct usb_endpoint_descriptor *endp;
3139
3140 for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3141 endp = &iface->endpoint[i].desc;
3142 if (((endp->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == dir) &&
3143 (usb_endpoint_type(endp) == type))
3144 return endp;
3145 }
3146
3147 return NULL;
3148 }
3149
3150 /* Get the byte that describes which ports are enabled */
hso_get_mux_ports(struct usb_interface * intf,unsigned char * ports)3151 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports)
3152 {
3153 int i;
3154 struct usb_host_interface *iface = intf->cur_altsetting;
3155
3156 if (iface->extralen == 3) {
3157 *ports = iface->extra[2];
3158 return 0;
3159 }
3160
3161 for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3162 if (iface->endpoint[i].extralen == 3) {
3163 *ports = iface->endpoint[i].extra[2];
3164 return 0;
3165 }
3166 }
3167
3168 return -1;
3169 }
3170
3171 /* interrupt urb needs to be submitted, used for serial read of muxed port */
hso_mux_submit_intr_urb(struct hso_shared_int * shared_int,struct usb_device * usb,gfp_t gfp)3172 static int hso_mux_submit_intr_urb(struct hso_shared_int *shared_int,
3173 struct usb_device *usb, gfp_t gfp)
3174 {
3175 int result;
3176
3177 usb_fill_int_urb(shared_int->shared_intr_urb, usb,
3178 usb_rcvintpipe(usb,
3179 shared_int->intr_endp->bEndpointAddress & 0x7F),
3180 shared_int->shared_intr_buf,
3181 1,
3182 intr_callback, shared_int,
3183 shared_int->intr_endp->bInterval);
3184
3185 result = usb_submit_urb(shared_int->shared_intr_urb, gfp);
3186 if (result)
3187 dev_warn(&usb->dev, "%s failed mux_intr_urb %d\n", __func__,
3188 result);
3189
3190 return result;
3191 }
3192
3193 /* operations setup of the serial interface */
3194 static const struct tty_operations hso_serial_ops = {
3195 .open = hso_serial_open,
3196 .close = hso_serial_close,
3197 .write = hso_serial_write,
3198 .write_room = hso_serial_write_room,
3199 .cleanup = hso_serial_cleanup,
3200 .ioctl = hso_serial_ioctl,
3201 .set_termios = hso_serial_set_termios,
3202 .chars_in_buffer = hso_serial_chars_in_buffer,
3203 .tiocmget = hso_serial_tiocmget,
3204 .tiocmset = hso_serial_tiocmset,
3205 .get_icount = hso_get_count,
3206 .unthrottle = hso_unthrottle
3207 };
3208
3209 static struct usb_driver hso_driver = {
3210 .name = driver_name,
3211 .probe = hso_probe,
3212 .disconnect = hso_disconnect,
3213 .id_table = hso_ids,
3214 .suspend = hso_suspend,
3215 .resume = hso_resume,
3216 .reset_resume = hso_resume,
3217 .supports_autosuspend = 1,
3218 .disable_hub_initiated_lpm = 1,
3219 };
3220
hso_init(void)3221 static int __init hso_init(void)
3222 {
3223 int i;
3224 int result;
3225
3226 /* put it in the log */
3227 pr_info("%s\n", version);
3228
3229 /* Initialise the serial table semaphore and table */
3230 for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++)
3231 serial_table[i] = NULL;
3232
3233 /* allocate our driver using the proper amount of supported minors */
3234 tty_drv = alloc_tty_driver(HSO_SERIAL_TTY_MINORS);
3235 if (!tty_drv)
3236 return -ENOMEM;
3237
3238 /* fill in all needed values */
3239 tty_drv->driver_name = driver_name;
3240 tty_drv->name = tty_filename;
3241
3242 /* if major number is provided as parameter, use that one */
3243 if (tty_major)
3244 tty_drv->major = tty_major;
3245
3246 tty_drv->minor_start = 0;
3247 tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
3248 tty_drv->subtype = SERIAL_TYPE_NORMAL;
3249 tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3250 tty_drv->init_termios = tty_std_termios;
3251 hso_init_termios(&tty_drv->init_termios);
3252 tty_set_operations(tty_drv, &hso_serial_ops);
3253
3254 /* register the tty driver */
3255 result = tty_register_driver(tty_drv);
3256 if (result) {
3257 pr_err("%s - tty_register_driver failed(%d)\n",
3258 __func__, result);
3259 goto err_free_tty;
3260 }
3261
3262 /* register this module as an usb driver */
3263 result = usb_register(&hso_driver);
3264 if (result) {
3265 pr_err("Could not register hso driver - error: %d\n", result);
3266 goto err_unreg_tty;
3267 }
3268
3269 /* done */
3270 return 0;
3271 err_unreg_tty:
3272 tty_unregister_driver(tty_drv);
3273 err_free_tty:
3274 put_tty_driver(tty_drv);
3275 return result;
3276 }
3277
hso_exit(void)3278 static void __exit hso_exit(void)
3279 {
3280 pr_info("unloaded\n");
3281
3282 tty_unregister_driver(tty_drv);
3283 /* deregister the usb driver */
3284 usb_deregister(&hso_driver);
3285 put_tty_driver(tty_drv);
3286 }
3287
3288 /* Module definitions */
3289 module_init(hso_init);
3290 module_exit(hso_exit);
3291
3292 MODULE_AUTHOR(MOD_AUTHOR);
3293 MODULE_DESCRIPTION(MOD_DESCRIPTION);
3294 MODULE_LICENSE("GPL");
3295
3296 /* change the debug level (eg: insmod hso.ko debug=0x04) */
3297 MODULE_PARM_DESC(debug, "debug level mask [0x01 | 0x02 | 0x04 | 0x08 | 0x10]");
3298 module_param(debug, int, 0644);
3299
3300 /* set the major tty number (eg: insmod hso.ko tty_major=245) */
3301 MODULE_PARM_DESC(tty_major, "Set the major tty number");
3302 module_param(tty_major, int, 0644);
3303
3304 /* disable network interface (eg: insmod hso.ko disable_net=1) */
3305 MODULE_PARM_DESC(disable_net, "Disable the network interface");
3306 module_param(disable_net, int, 0644);
3307