Bryan Wu | c6994e6 | 2009-06-03 09:17:58 -0400 | [diff] [blame] | 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/utsname.h> |
| 16 | |
| 17 | #include "u_audio.h" |
| 18 | |
| 19 | #define DRIVER_DESC "Linux USB Audio Gadget" |
| 20 | #define DRIVER_VERSION "Dec 18, 2008" |
| 21 | |
| 22 | /*-------------------------------------------------------------------------*/ |
| 23 | |
| 24 | /* |
| 25 | * Kbuild is not very cooperative with respect to linking separately |
| 26 | * compiled library objects into one module. So for now we won't use |
| 27 | * separate compilation ... ensuring init/exit sections work to shrink |
| 28 | * the runtime footprint, and giving us at least some parts of what |
| 29 | * a "gcc --combine ... part1.c part2.c part3.c ... " build would. |
| 30 | */ |
| 31 | #include "composite.c" |
| 32 | #include "usbstring.c" |
| 33 | #include "config.c" |
| 34 | #include "epautoconf.c" |
| 35 | |
| 36 | #include "u_audio.c" |
| 37 | #include "f_audio.c" |
| 38 | |
| 39 | /*-------------------------------------------------------------------------*/ |
| 40 | |
| 41 | /* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!! |
| 42 | * Instead: allocate your own, using normal USB-IF procedures. |
| 43 | */ |
| 44 | |
Greg Kroah-Hartman | 05cbc2d | 2009-06-23 16:01:06 -0700 | [diff] [blame] | 45 | /* Thanks to Linux Foundation for donating this product ID. */ |
| 46 | #define AUDIO_VENDOR_NUM 0x1d6b /* Linux Foundation */ |
| 47 | #define AUDIO_PRODUCT_NUM 0x0101 /* Linux-USB Audio Gadget */ |
Bryan Wu | c6994e6 | 2009-06-03 09:17:58 -0400 | [diff] [blame] | 48 | |
| 49 | /*-------------------------------------------------------------------------*/ |
| 50 | |
| 51 | static struct usb_device_descriptor device_desc = { |
| 52 | .bLength = sizeof device_desc, |
| 53 | .bDescriptorType = USB_DT_DEVICE, |
| 54 | |
| 55 | .bcdUSB = __constant_cpu_to_le16(0x200), |
| 56 | |
| 57 | .bDeviceClass = USB_CLASS_PER_INTERFACE, |
| 58 | .bDeviceSubClass = 0, |
| 59 | .bDeviceProtocol = 0, |
| 60 | /* .bMaxPacketSize0 = f(hardware) */ |
| 61 | |
| 62 | /* Vendor and product id defaults change according to what configs |
| 63 | * we support. (As does bNumConfigurations.) These values can |
| 64 | * also be overridden by module parameters. |
| 65 | */ |
| 66 | .idVendor = __constant_cpu_to_le16(AUDIO_VENDOR_NUM), |
| 67 | .idProduct = __constant_cpu_to_le16(AUDIO_PRODUCT_NUM), |
| 68 | /* .bcdDevice = f(hardware) */ |
| 69 | /* .iManufacturer = DYNAMIC */ |
| 70 | /* .iProduct = DYNAMIC */ |
| 71 | /* NO SERIAL NUMBER */ |
| 72 | .bNumConfigurations = 1, |
| 73 | }; |
| 74 | |
| 75 | static struct usb_otg_descriptor otg_descriptor = { |
| 76 | .bLength = sizeof otg_descriptor, |
| 77 | .bDescriptorType = USB_DT_OTG, |
| 78 | |
| 79 | /* REVISIT SRP-only hardware is possible, although |
| 80 | * it would not be called "OTG" ... |
| 81 | */ |
| 82 | .bmAttributes = USB_OTG_SRP | USB_OTG_HNP, |
| 83 | }; |
| 84 | |
| 85 | static const struct usb_descriptor_header *otg_desc[] = { |
| 86 | (struct usb_descriptor_header *) &otg_descriptor, |
| 87 | NULL, |
| 88 | }; |
| 89 | |
| 90 | /*-------------------------------------------------------------------------*/ |
| 91 | |
| 92 | /** |
| 93 | * Handle USB audio endpoint set/get command in setup class request |
| 94 | */ |
| 95 | |
| 96 | static int audio_set_endpoint_req(struct usb_configuration *c, |
| 97 | const struct usb_ctrlrequest *ctrl) |
| 98 | { |
| 99 | struct usb_composite_dev *cdev = c->cdev; |
| 100 | int value = -EOPNOTSUPP; |
| 101 | u16 ep = le16_to_cpu(ctrl->wIndex); |
| 102 | u16 len = le16_to_cpu(ctrl->wLength); |
| 103 | u16 w_value = le16_to_cpu(ctrl->wValue); |
| 104 | |
| 105 | DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n", |
| 106 | ctrl->bRequest, w_value, len, ep); |
| 107 | |
| 108 | switch (ctrl->bRequest) { |
| 109 | case SET_CUR: |
| 110 | value = 0; |
| 111 | break; |
| 112 | |
| 113 | case SET_MIN: |
| 114 | break; |
| 115 | |
| 116 | case SET_MAX: |
| 117 | break; |
| 118 | |
| 119 | case SET_RES: |
| 120 | break; |
| 121 | |
| 122 | case SET_MEM: |
| 123 | break; |
| 124 | |
| 125 | default: |
| 126 | break; |
| 127 | } |
| 128 | |
| 129 | return value; |
| 130 | } |
| 131 | |
| 132 | static int audio_get_endpoint_req(struct usb_configuration *c, |
| 133 | const struct usb_ctrlrequest *ctrl) |
| 134 | { |
| 135 | struct usb_composite_dev *cdev = c->cdev; |
| 136 | int value = -EOPNOTSUPP; |
| 137 | u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF); |
| 138 | u16 len = le16_to_cpu(ctrl->wLength); |
| 139 | u16 w_value = le16_to_cpu(ctrl->wValue); |
| 140 | |
| 141 | DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n", |
| 142 | ctrl->bRequest, w_value, len, ep); |
| 143 | |
| 144 | switch (ctrl->bRequest) { |
| 145 | case GET_CUR: |
| 146 | case GET_MIN: |
| 147 | case GET_MAX: |
| 148 | case GET_RES: |
| 149 | value = 3; |
| 150 | break; |
| 151 | case GET_MEM: |
| 152 | break; |
| 153 | default: |
| 154 | break; |
| 155 | } |
| 156 | |
| 157 | return value; |
| 158 | } |
| 159 | |
| 160 | static int |
| 161 | audio_setup(struct usb_configuration *c, const struct usb_ctrlrequest *ctrl) |
| 162 | { |
| 163 | struct usb_composite_dev *cdev = c->cdev; |
| 164 | struct usb_request *req = cdev->req; |
| 165 | int value = -EOPNOTSUPP; |
| 166 | u16 w_index = le16_to_cpu(ctrl->wIndex); |
| 167 | u16 w_value = le16_to_cpu(ctrl->wValue); |
| 168 | u16 w_length = le16_to_cpu(ctrl->wLength); |
| 169 | |
| 170 | /* composite driver infrastructure handles everything except |
| 171 | * Audio class messages; interface activation uses set_alt(). |
| 172 | */ |
| 173 | switch (ctrl->bRequestType) { |
| 174 | case USB_AUDIO_SET_ENDPOINT: |
| 175 | value = audio_set_endpoint_req(c, ctrl); |
| 176 | break; |
| 177 | |
| 178 | case USB_AUDIO_GET_ENDPOINT: |
| 179 | value = audio_get_endpoint_req(c, ctrl); |
| 180 | break; |
| 181 | |
| 182 | default: |
| 183 | ERROR(cdev, "Invalid control req%02x.%02x v%04x i%04x l%d\n", |
| 184 | ctrl->bRequestType, ctrl->bRequest, |
| 185 | w_value, w_index, w_length); |
| 186 | } |
| 187 | |
| 188 | /* respond with data transfer or status phase? */ |
| 189 | if (value >= 0) { |
| 190 | DBG(cdev, "Audio req%02x.%02x v%04x i%04x l%d\n", |
| 191 | ctrl->bRequestType, ctrl->bRequest, |
| 192 | w_value, w_index, w_length); |
| 193 | req->zero = 0; |
| 194 | req->length = value; |
| 195 | value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); |
| 196 | if (value < 0) |
| 197 | ERROR(cdev, "Audio response on err %d\n", value); |
| 198 | } |
| 199 | |
| 200 | /* device either stalls (value < 0) or reports success */ |
| 201 | return value; |
| 202 | } |
| 203 | |
| 204 | /*-------------------------------------------------------------------------*/ |
| 205 | |
| 206 | static int __init audio_do_config(struct usb_configuration *c) |
| 207 | { |
| 208 | /* FIXME alloc iConfiguration string, set it in c->strings */ |
| 209 | |
| 210 | if (gadget_is_otg(c->cdev->gadget)) { |
| 211 | c->descriptors = otg_desc; |
| 212 | c->bmAttributes |= USB_CONFIG_ATT_WAKEUP; |
| 213 | } |
| 214 | |
| 215 | audio_bind_config(c); |
| 216 | |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | static struct usb_configuration audio_config_driver = { |
| 221 | .label = DRIVER_DESC, |
| 222 | .bind = audio_do_config, |
| 223 | .setup = audio_setup, |
| 224 | .bConfigurationValue = 1, |
| 225 | /* .iConfiguration = DYNAMIC */ |
| 226 | .bmAttributes = USB_CONFIG_ATT_SELFPOWER, |
| 227 | }; |
| 228 | |
| 229 | /*-------------------------------------------------------------------------*/ |
| 230 | |
| 231 | static int __init audio_bind(struct usb_composite_dev *cdev) |
| 232 | { |
| 233 | int gcnum; |
| 234 | int status; |
| 235 | |
| 236 | gcnum = usb_gadget_controller_number(cdev->gadget); |
| 237 | if (gcnum >= 0) |
| 238 | device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum); |
| 239 | else { |
| 240 | ERROR(cdev, "controller '%s' not recognized; trying %s\n", |
| 241 | cdev->gadget->name, |
| 242 | audio_config_driver.label); |
| 243 | device_desc.bcdDevice = |
| 244 | __constant_cpu_to_le16(0x0300 | 0x0099); |
| 245 | } |
| 246 | |
| 247 | /* device descriptor strings: manufacturer, product */ |
| 248 | snprintf(manufacturer, sizeof manufacturer, "%s %s with %s", |
| 249 | init_utsname()->sysname, init_utsname()->release, |
| 250 | cdev->gadget->name); |
| 251 | status = usb_string_id(cdev); |
| 252 | if (status < 0) |
| 253 | goto fail; |
| 254 | strings_dev[STRING_MANUFACTURER_IDX].id = status; |
| 255 | device_desc.iManufacturer = status; |
| 256 | |
| 257 | status = usb_string_id(cdev); |
| 258 | if (status < 0) |
| 259 | goto fail; |
| 260 | strings_dev[STRING_PRODUCT_IDX].id = status; |
| 261 | device_desc.iProduct = status; |
| 262 | |
| 263 | status = usb_add_config(cdev, &audio_config_driver); |
| 264 | if (status < 0) |
| 265 | goto fail; |
| 266 | |
| 267 | INFO(cdev, "%s, version: %s\n", DRIVER_DESC, DRIVER_VERSION); |
| 268 | return 0; |
| 269 | |
| 270 | fail: |
| 271 | return status; |
| 272 | } |
| 273 | |
| 274 | static int __exit audio_unbind(struct usb_composite_dev *cdev) |
| 275 | { |
| 276 | return 0; |
| 277 | } |
| 278 | |
| 279 | static struct usb_composite_driver audio_driver = { |
| 280 | .name = "g_audio", |
| 281 | .dev = &device_desc, |
| 282 | .strings = audio_strings, |
| 283 | .bind = audio_bind, |
| 284 | .unbind = __exit_p(audio_unbind), |
| 285 | }; |
| 286 | |
| 287 | static int __init init(void) |
| 288 | { |
| 289 | return usb_composite_register(&audio_driver); |
| 290 | } |
| 291 | module_init(init); |
| 292 | |
| 293 | static void __exit cleanup(void) |
| 294 | { |
| 295 | usb_composite_unregister(&audio_driver); |
| 296 | } |
| 297 | module_exit(cleanup); |
| 298 | |
| 299 | MODULE_DESCRIPTION(DRIVER_DESC); |
| 300 | MODULE_AUTHOR("Bryan Wu <cooloney@kernel.org>"); |
| 301 | MODULE_LICENSE("GPL"); |
| 302 | |