1 /* 2 * audio.c -- Audio gadget driver 3 * 4 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org> 5 * Copyright (C) 2008 Analog Devices, Inc 6 * 7 * Enter bugs at http://blackfin.uclinux.org/ 8 * 9 * Licensed under the GPL-2 or later. 10 */ 11 12 /* #define VERBOSE_DEBUG */ 13 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/usb/composite.h> 17 18 #include "gadget_chips.h" 19 #define DRIVER_DESC "Linux USB Audio Gadget" 20 #define DRIVER_VERSION "Feb 2, 2012" 21 22 USB_GADGET_COMPOSITE_OPTIONS(); 23 24 #ifndef CONFIG_GADGET_UAC1 25 #include "u_uac2.h" 26 27 /* Playback(USB-IN) Default Stereo - Fl/Fr */ 28 static int p_chmask = UAC2_DEF_PCHMASK; 29 module_param(p_chmask, uint, S_IRUGO); 30 MODULE_PARM_DESC(p_chmask, "Playback Channel Mask"); 31 32 /* Playback Default 48 KHz */ 33 static int p_srate = UAC2_DEF_PSRATE; 34 module_param(p_srate, uint, S_IRUGO); 35 MODULE_PARM_DESC(p_srate, "Playback Sampling Rate"); 36 37 /* Playback Default 16bits/sample */ 38 static int p_ssize = UAC2_DEF_PSSIZE; 39 module_param(p_ssize, uint, S_IRUGO); 40 MODULE_PARM_DESC(p_ssize, "Playback Sample Size(bytes)"); 41 42 /* Capture(USB-OUT) Default Stereo - Fl/Fr */ 43 static int c_chmask = UAC2_DEF_CCHMASK; 44 module_param(c_chmask, uint, S_IRUGO); 45 MODULE_PARM_DESC(c_chmask, "Capture Channel Mask"); 46 47 /* Capture Default 64 KHz */ 48 static int c_srate = UAC2_DEF_CSRATE; 49 module_param(c_srate, uint, S_IRUGO); 50 MODULE_PARM_DESC(c_srate, "Capture Sampling Rate"); 51 52 /* Capture Default 16bits/sample */ 53 static int c_ssize = UAC2_DEF_CSSIZE; 54 module_param(c_ssize, uint, S_IRUGO); 55 MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)"); 56 #else 57 #include "u_uac1.h" 58 59 static char *fn_play = FILE_PCM_PLAYBACK; 60 module_param(fn_play, charp, S_IRUGO); 61 MODULE_PARM_DESC(fn_play, "Playback PCM device file name"); 62 63 static char *fn_cap = FILE_PCM_CAPTURE; 64 module_param(fn_cap, charp, S_IRUGO); 65 MODULE_PARM_DESC(fn_cap, "Capture PCM device file name"); 66 67 static char *fn_cntl = FILE_CONTROL; 68 module_param(fn_cntl, charp, S_IRUGO); 69 MODULE_PARM_DESC(fn_cntl, "Control device file name"); 70 71 static int req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE; 72 module_param(req_buf_size, int, S_IRUGO); 73 MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size"); 74 75 static int req_count = UAC1_REQ_COUNT; 76 module_param(req_count, int, S_IRUGO); 77 MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count"); 78 79 static int audio_buf_size = UAC1_AUDIO_BUF_SIZE; 80 module_param(audio_buf_size, int, S_IRUGO); 81 MODULE_PARM_DESC(audio_buf_size, "Audio buffer size"); 82 #endif 83 84 /* string IDs are assigned dynamically */ 85 86 static struct usb_string strings_dev[] = { 87 [USB_GADGET_MANUFACTURER_IDX].s = "", 88 [USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC, 89 [USB_GADGET_SERIAL_IDX].s = "", 90 { } /* end of list */ 91 }; 92 93 static struct usb_gadget_strings stringtab_dev = { 94 .language = 0x0409, /* en-us */ 95 .strings = strings_dev, 96 }; 97 98 static struct usb_gadget_strings *audio_strings[] = { 99 &stringtab_dev, 100 NULL, 101 }; 102 103 #ifndef CONFIG_GADGET_UAC1 104 static struct usb_function_instance *fi_uac2; 105 static struct usb_function *f_uac2; 106 #else 107 static struct usb_function_instance *fi_uac1; 108 static struct usb_function *f_uac1; 109 #endif 110 111 /*-------------------------------------------------------------------------*/ 112 113 /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!! 114 * Instead: allocate your own, using normal USB-IF procedures. 115 */ 116 117 /* Thanks to Linux Foundation for donating this product ID. */ 118 #define AUDIO_VENDOR_NUM 0x1d6b /* Linux Foundation */ 119 #define AUDIO_PRODUCT_NUM 0x0101 /* Linux-USB Audio Gadget */ 120 121 /*-------------------------------------------------------------------------*/ 122 123 static struct usb_device_descriptor device_desc = { 124 .bLength = sizeof device_desc, 125 .bDescriptorType = USB_DT_DEVICE, 126 127 .bcdUSB = cpu_to_le16(0x200), 128 129 #ifdef CONFIG_GADGET_UAC1 130 .bDeviceClass = USB_CLASS_PER_INTERFACE, 131 .bDeviceSubClass = 0, 132 .bDeviceProtocol = 0, 133 #else 134 .bDeviceClass = USB_CLASS_MISC, 135 .bDeviceSubClass = 0x02, 136 .bDeviceProtocol = 0x01, 137 #endif 138 /* .bMaxPacketSize0 = f(hardware) */ 139 140 /* Vendor and product id defaults change according to what configs 141 * we support. (As does bNumConfigurations.) These values can 142 * also be overridden by module parameters. 143 */ 144 .idVendor = cpu_to_le16(AUDIO_VENDOR_NUM), 145 .idProduct = cpu_to_le16(AUDIO_PRODUCT_NUM), 146 /* .bcdDevice = f(hardware) */ 147 /* .iManufacturer = DYNAMIC */ 148 /* .iProduct = DYNAMIC */ 149 /* NO SERIAL NUMBER */ 150 .bNumConfigurations = 1, 151 }; 152 153 static const struct usb_descriptor_header *otg_desc[2]; 154 155 /*-------------------------------------------------------------------------*/ 156 157 static int audio_do_config(struct usb_configuration *c) 158 { 159 int status; 160 161 /* FIXME alloc iConfiguration string, set it in c->strings */ 162 163 if (gadget_is_otg(c->cdev->gadget)) { 164 c->descriptors = otg_desc; 165 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP; 166 } 167 168 #ifdef CONFIG_GADGET_UAC1 169 f_uac1 = usb_get_function(fi_uac1); 170 if (IS_ERR(f_uac1)) { 171 status = PTR_ERR(f_uac1); 172 return status; 173 } 174 175 status = usb_add_function(c, f_uac1); 176 if (status < 0) { 177 usb_put_function(f_uac1); 178 return status; 179 } 180 #else 181 f_uac2 = usb_get_function(fi_uac2); 182 if (IS_ERR(f_uac2)) { 183 status = PTR_ERR(f_uac2); 184 return status; 185 } 186 187 status = usb_add_function(c, f_uac2); 188 if (status < 0) { 189 usb_put_function(f_uac2); 190 return status; 191 } 192 #endif 193 194 return 0; 195 } 196 197 static struct usb_configuration audio_config_driver = { 198 .label = DRIVER_DESC, 199 .bConfigurationValue = 1, 200 /* .iConfiguration = DYNAMIC */ 201 .bmAttributes = USB_CONFIG_ATT_SELFPOWER, 202 }; 203 204 /*-------------------------------------------------------------------------*/ 205 206 static int audio_bind(struct usb_composite_dev *cdev) 207 { 208 #ifndef CONFIG_GADGET_UAC1 209 struct f_uac2_opts *uac2_opts; 210 #else 211 struct f_uac1_opts *uac1_opts; 212 #endif 213 int status; 214 215 #ifndef CONFIG_GADGET_UAC1 216 fi_uac2 = usb_get_function_instance("uac2"); 217 if (IS_ERR(fi_uac2)) 218 return PTR_ERR(fi_uac2); 219 #else 220 fi_uac1 = usb_get_function_instance("uac1"); 221 if (IS_ERR(fi_uac1)) 222 return PTR_ERR(fi_uac1); 223 #endif 224 225 #ifndef CONFIG_GADGET_UAC1 226 uac2_opts = container_of(fi_uac2, struct f_uac2_opts, func_inst); 227 uac2_opts->p_chmask = p_chmask; 228 uac2_opts->p_srate = p_srate; 229 uac2_opts->p_ssize = p_ssize; 230 uac2_opts->c_chmask = c_chmask; 231 uac2_opts->c_srate = c_srate; 232 uac2_opts->c_ssize = c_ssize; 233 #else 234 uac1_opts = container_of(fi_uac1, struct f_uac1_opts, func_inst); 235 uac1_opts->fn_play = fn_play; 236 uac1_opts->fn_cap = fn_cap; 237 uac1_opts->fn_cntl = fn_cntl; 238 uac1_opts->req_buf_size = req_buf_size; 239 uac1_opts->req_count = req_count; 240 uac1_opts->audio_buf_size = audio_buf_size; 241 #endif 242 243 status = usb_string_ids_tab(cdev, strings_dev); 244 if (status < 0) 245 goto fail; 246 device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id; 247 device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id; 248 249 if (gadget_is_otg(cdev->gadget) && !otg_desc[0]) { 250 struct usb_descriptor_header *usb_desc; 251 252 usb_desc = usb_otg_descriptor_alloc(cdev->gadget); 253 if (!usb_desc) 254 goto fail; 255 usb_otg_descriptor_init(cdev->gadget, usb_desc); 256 otg_desc[0] = usb_desc; 257 otg_desc[1] = NULL; 258 } 259 260 status = usb_add_config(cdev, &audio_config_driver, audio_do_config); 261 if (status < 0) 262 goto fail_otg_desc; 263 usb_composite_overwrite_options(cdev, &coverwrite); 264 265 INFO(cdev, "%s, version: %s\n", DRIVER_DESC, DRIVER_VERSION); 266 return 0; 267 268 fail_otg_desc: 269 kfree(otg_desc[0]); 270 otg_desc[0] = NULL; 271 fail: 272 #ifndef CONFIG_GADGET_UAC1 273 usb_put_function_instance(fi_uac2); 274 #else 275 usb_put_function_instance(fi_uac1); 276 #endif 277 return status; 278 } 279 280 static int audio_unbind(struct usb_composite_dev *cdev) 281 { 282 #ifdef CONFIG_GADGET_UAC1 283 if (!IS_ERR_OR_NULL(f_uac1)) 284 usb_put_function(f_uac1); 285 if (!IS_ERR_OR_NULL(fi_uac1)) 286 usb_put_function_instance(fi_uac1); 287 #else 288 if (!IS_ERR_OR_NULL(f_uac2)) 289 usb_put_function(f_uac2); 290 if (!IS_ERR_OR_NULL(fi_uac2)) 291 usb_put_function_instance(fi_uac2); 292 #endif 293 kfree(otg_desc[0]); 294 otg_desc[0] = NULL; 295 296 return 0; 297 } 298 299 static struct usb_composite_driver audio_driver = { 300 .name = "g_audio", 301 .dev = &device_desc, 302 .strings = audio_strings, 303 .max_speed = USB_SPEED_HIGH, 304 .bind = audio_bind, 305 .unbind = audio_unbind, 306 }; 307 308 module_usb_composite_driver(audio_driver); 309 310 MODULE_DESCRIPTION(DRIVER_DESC); 311 MODULE_AUTHOR("Bryan Wu <cooloney@kernel.org>"); 312 MODULE_LICENSE("GPL"); 313 314