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 #define DRIVER_DESC "Linux USB Audio Gadget" 19 #define DRIVER_VERSION "Feb 2, 2012" 20 21 USB_GADGET_COMPOSITE_OPTIONS(); 22 23 #ifndef CONFIG_GADGET_UAC1 24 #include "u_uac2.h" 25 26 /* Playback(USB-IN) Default Stereo - Fl/Fr */ 27 static int p_chmask = UAC2_DEF_PCHMASK; 28 module_param(p_chmask, uint, S_IRUGO); 29 MODULE_PARM_DESC(p_chmask, "Playback Channel Mask"); 30 31 /* Playback Default 48 KHz */ 32 static int p_srate = UAC2_DEF_PSRATE; 33 module_param(p_srate, uint, S_IRUGO); 34 MODULE_PARM_DESC(p_srate, "Playback Sampling Rate"); 35 36 /* Playback Default 16bits/sample */ 37 static int p_ssize = UAC2_DEF_PSSIZE; 38 module_param(p_ssize, uint, S_IRUGO); 39 MODULE_PARM_DESC(p_ssize, "Playback Sample Size(bytes)"); 40 41 /* Capture(USB-OUT) Default Stereo - Fl/Fr */ 42 static int c_chmask = UAC2_DEF_CCHMASK; 43 module_param(c_chmask, uint, S_IRUGO); 44 MODULE_PARM_DESC(c_chmask, "Capture Channel Mask"); 45 46 /* Capture Default 64 KHz */ 47 static int c_srate = UAC2_DEF_CSRATE; 48 module_param(c_srate, uint, S_IRUGO); 49 MODULE_PARM_DESC(c_srate, "Capture Sampling Rate"); 50 51 /* Capture Default 16bits/sample */ 52 static int c_ssize = UAC2_DEF_CSSIZE; 53 module_param(c_ssize, uint, S_IRUGO); 54 MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)"); 55 #else 56 #include "u_uac1.h" 57 58 static char *fn_play = FILE_PCM_PLAYBACK; 59 module_param(fn_play, charp, S_IRUGO); 60 MODULE_PARM_DESC(fn_play, "Playback PCM device file name"); 61 62 static char *fn_cap = FILE_PCM_CAPTURE; 63 module_param(fn_cap, charp, S_IRUGO); 64 MODULE_PARM_DESC(fn_cap, "Capture PCM device file name"); 65 66 static char *fn_cntl = FILE_CONTROL; 67 module_param(fn_cntl, charp, S_IRUGO); 68 MODULE_PARM_DESC(fn_cntl, "Control device file name"); 69 70 static int req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE; 71 module_param(req_buf_size, int, S_IRUGO); 72 MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size"); 73 74 static int req_count = UAC1_REQ_COUNT; 75 module_param(req_count, int, S_IRUGO); 76 MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count"); 77 78 static int audio_buf_size = UAC1_AUDIO_BUF_SIZE; 79 module_param(audio_buf_size, int, S_IRUGO); 80 MODULE_PARM_DESC(audio_buf_size, "Audio buffer size"); 81 #endif 82 83 /* string IDs are assigned dynamically */ 84 85 static struct usb_string strings_dev[] = { 86 [USB_GADGET_MANUFACTURER_IDX].s = "", 87 [USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC, 88 [USB_GADGET_SERIAL_IDX].s = "", 89 { } /* end of list */ 90 }; 91 92 static struct usb_gadget_strings stringtab_dev = { 93 .language = 0x0409, /* en-us */ 94 .strings = strings_dev, 95 }; 96 97 static struct usb_gadget_strings *audio_strings[] = { 98 &stringtab_dev, 99 NULL, 100 }; 101 102 #ifndef CONFIG_GADGET_UAC1 103 static struct usb_function_instance *fi_uac2; 104 static struct usb_function *f_uac2; 105 #else 106 static struct usb_function_instance *fi_uac1; 107 static struct usb_function *f_uac1; 108 #endif 109 110 /*-------------------------------------------------------------------------*/ 111 112 /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!! 113 * Instead: allocate your own, using normal USB-IF procedures. 114 */ 115 116 /* Thanks to Linux Foundation for donating this product ID. */ 117 #define AUDIO_VENDOR_NUM 0x1d6b /* Linux Foundation */ 118 #define AUDIO_PRODUCT_NUM 0x0101 /* Linux-USB Audio Gadget */ 119 120 /*-------------------------------------------------------------------------*/ 121 122 static struct usb_device_descriptor device_desc = { 123 .bLength = sizeof device_desc, 124 .bDescriptorType = USB_DT_DEVICE, 125 126 /* .bcdUSB = DYNAMIC */ 127 128 #ifdef CONFIG_GADGET_UAC1 129 .bDeviceClass = USB_CLASS_PER_INTERFACE, 130 .bDeviceSubClass = 0, 131 .bDeviceProtocol = 0, 132 #else 133 .bDeviceClass = USB_CLASS_MISC, 134 .bDeviceSubClass = 0x02, 135 .bDeviceProtocol = 0x01, 136 #endif 137 /* .bMaxPacketSize0 = f(hardware) */ 138 139 /* Vendor and product id defaults change according to what configs 140 * we support. (As does bNumConfigurations.) These values can 141 * also be overridden by module parameters. 142 */ 143 .idVendor = cpu_to_le16(AUDIO_VENDOR_NUM), 144 .idProduct = cpu_to_le16(AUDIO_PRODUCT_NUM), 145 /* .bcdDevice = f(hardware) */ 146 /* .iManufacturer = DYNAMIC */ 147 /* .iProduct = DYNAMIC */ 148 /* NO SERIAL NUMBER */ 149 .bNumConfigurations = 1, 150 }; 151 152 static const struct usb_descriptor_header *otg_desc[2]; 153 154 /*-------------------------------------------------------------------------*/ 155 156 static int audio_do_config(struct usb_configuration *c) 157 { 158 int status; 159 160 /* FIXME alloc iConfiguration string, set it in c->strings */ 161 162 if (gadget_is_otg(c->cdev->gadget)) { 163 c->descriptors = otg_desc; 164 c->bmAttributes |= USB_CONFIG_ATT_WAKEUP; 165 } 166 167 #ifdef CONFIG_GADGET_UAC1 168 f_uac1 = usb_get_function(fi_uac1); 169 if (IS_ERR(f_uac1)) { 170 status = PTR_ERR(f_uac1); 171 return status; 172 } 173 174 status = usb_add_function(c, f_uac1); 175 if (status < 0) { 176 usb_put_function(f_uac1); 177 return status; 178 } 179 #else 180 f_uac2 = usb_get_function(fi_uac2); 181 if (IS_ERR(f_uac2)) { 182 status = PTR_ERR(f_uac2); 183 return status; 184 } 185 186 status = usb_add_function(c, f_uac2); 187 if (status < 0) { 188 usb_put_function(f_uac2); 189 return status; 190 } 191 #endif 192 193 return 0; 194 } 195 196 static struct usb_configuration audio_config_driver = { 197 .label = DRIVER_DESC, 198 .bConfigurationValue = 1, 199 /* .iConfiguration = DYNAMIC */ 200 .bmAttributes = USB_CONFIG_ATT_SELFPOWER, 201 }; 202 203 /*-------------------------------------------------------------------------*/ 204 205 static int audio_bind(struct usb_composite_dev *cdev) 206 { 207 #ifndef CONFIG_GADGET_UAC1 208 struct f_uac2_opts *uac2_opts; 209 #else 210 struct f_uac1_opts *uac1_opts; 211 #endif 212 int status; 213 214 #ifndef CONFIG_GADGET_UAC1 215 fi_uac2 = usb_get_function_instance("uac2"); 216 if (IS_ERR(fi_uac2)) 217 return PTR_ERR(fi_uac2); 218 #else 219 fi_uac1 = usb_get_function_instance("uac1"); 220 if (IS_ERR(fi_uac1)) 221 return PTR_ERR(fi_uac1); 222 #endif 223 224 #ifndef CONFIG_GADGET_UAC1 225 uac2_opts = container_of(fi_uac2, struct f_uac2_opts, func_inst); 226 uac2_opts->p_chmask = p_chmask; 227 uac2_opts->p_srate = p_srate; 228 uac2_opts->p_ssize = p_ssize; 229 uac2_opts->c_chmask = c_chmask; 230 uac2_opts->c_srate = c_srate; 231 uac2_opts->c_ssize = c_ssize; 232 uac2_opts->req_number = UAC2_DEF_REQ_NUM; 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