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