Ben Williamson | f2ebf92c | 2006-08-01 11:28:16 +1000 | [diff] [blame] | 1 | /* |
| 2 | * gmidi.c -- USB MIDI Gadget Driver |
| 3 | * |
| 4 | * Copyright (C) 2006 Thumtronics Pty Ltd. |
| 5 | * Developed for Thumtronics by Grey Innovation |
| 6 | * Ben Williamson <ben.williamson@greyinnovation.com> |
| 7 | * |
| 8 | * This software is distributed under the terms of the GNU General Public |
| 9 | * License ("GPL") version 2, as published by the Free Software Foundation. |
| 10 | * |
| 11 | * This code is based in part on: |
| 12 | * |
| 13 | * Gadget Zero driver, Copyright (C) 2003-2004 David Brownell. |
| 14 | * USB Audio driver, Copyright (C) 2002 by Takashi Iwai. |
| 15 | * USB MIDI driver, Copyright (C) 2002-2005 Clemens Ladisch. |
| 16 | * |
| 17 | * Refer to the USB Device Class Definition for MIDI Devices: |
| 18 | * http://www.usb.org/developers/devclass_docs/midi10.pdf |
| 19 | */ |
| 20 | |
| 21 | #define DEBUG 1 |
| 22 | // #define VERBOSE |
| 23 | |
Ben Williamson | f2ebf92c | 2006-08-01 11:28:16 +1000 | [diff] [blame] | 24 | #include <linux/module.h> |
| 25 | #include <linux/kernel.h> |
| 26 | #include <linux/delay.h> |
| 27 | #include <linux/errno.h> |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/utsname.h> |
| 30 | #include <linux/device.h> |
| 31 | #include <linux/moduleparam.h> |
| 32 | |
| 33 | #include <sound/driver.h> |
| 34 | #include <sound/core.h> |
| 35 | #include <sound/initval.h> |
| 36 | #include <sound/rawmidi.h> |
| 37 | |
| 38 | #include <linux/usb_ch9.h> |
| 39 | #include <linux/usb_gadget.h> |
| 40 | #include <linux/usb/audio.h> |
| 41 | #include <linux/usb/midi.h> |
| 42 | |
| 43 | #include "gadget_chips.h" |
| 44 | |
| 45 | MODULE_AUTHOR("Ben Williamson"); |
| 46 | MODULE_LICENSE("GPL v2"); |
| 47 | |
| 48 | #define DRIVER_VERSION "25 Jul 2006" |
| 49 | |
| 50 | static const char shortname[] = "g_midi"; |
| 51 | static const char longname[] = "MIDI Gadget"; |
| 52 | |
| 53 | static int index = SNDRV_DEFAULT_IDX1; |
| 54 | static char *id = SNDRV_DEFAULT_STR1; |
| 55 | |
| 56 | module_param(index, int, 0444); |
| 57 | MODULE_PARM_DESC(index, "Index value for the USB MIDI Gadget adapter."); |
| 58 | module_param(id, charp, 0444); |
| 59 | MODULE_PARM_DESC(id, "ID string for the USB MIDI Gadget adapter."); |
| 60 | |
| 61 | /* Some systems will want different product identifers published in the |
| 62 | * device descriptor, either numbers or strings or both. These string |
| 63 | * parameters are in UTF-8 (superset of ASCII's 7 bit characters). |
| 64 | */ |
| 65 | |
| 66 | static ushort idVendor; |
| 67 | module_param(idVendor, ushort, S_IRUGO); |
| 68 | MODULE_PARM_DESC(idVendor, "USB Vendor ID"); |
| 69 | |
| 70 | static ushort idProduct; |
| 71 | module_param(idProduct, ushort, S_IRUGO); |
| 72 | MODULE_PARM_DESC(idProduct, "USB Product ID"); |
| 73 | |
| 74 | static ushort bcdDevice; |
| 75 | module_param(bcdDevice, ushort, S_IRUGO); |
| 76 | MODULE_PARM_DESC(bcdDevice, "USB Device version (BCD)"); |
| 77 | |
| 78 | static char *iManufacturer; |
| 79 | module_param(iManufacturer, charp, S_IRUGO); |
| 80 | MODULE_PARM_DESC(iManufacturer, "USB Manufacturer string"); |
| 81 | |
| 82 | static char *iProduct; |
| 83 | module_param(iProduct, charp, S_IRUGO); |
| 84 | MODULE_PARM_DESC(iProduct, "USB Product string"); |
| 85 | |
| 86 | static char *iSerialNumber; |
| 87 | module_param(iSerialNumber, charp, S_IRUGO); |
| 88 | MODULE_PARM_DESC(iSerialNumber, "SerialNumber"); |
| 89 | |
| 90 | /* |
| 91 | * this version autoconfigures as much as possible, |
| 92 | * which is reasonable for most "bulk-only" drivers. |
| 93 | */ |
| 94 | static const char *EP_IN_NAME; |
| 95 | static const char *EP_OUT_NAME; |
| 96 | |
| 97 | |
| 98 | /* big enough to hold our biggest descriptor */ |
| 99 | #define USB_BUFSIZ 256 |
| 100 | |
| 101 | |
| 102 | /* This is a gadget, and the IN/OUT naming is from the host's perspective. |
| 103 | USB -> OUT endpoint -> rawmidi |
| 104 | USB <- IN endpoint <- rawmidi */ |
| 105 | struct gmidi_in_port { |
| 106 | struct gmidi_device* dev; |
| 107 | int active; |
| 108 | uint8_t cable; /* cable number << 4 */ |
| 109 | uint8_t state; |
| 110 | #define STATE_UNKNOWN 0 |
| 111 | #define STATE_1PARAM 1 |
| 112 | #define STATE_2PARAM_1 2 |
| 113 | #define STATE_2PARAM_2 3 |
| 114 | #define STATE_SYSEX_0 4 |
| 115 | #define STATE_SYSEX_1 5 |
| 116 | #define STATE_SYSEX_2 6 |
| 117 | uint8_t data[2]; |
| 118 | }; |
| 119 | |
| 120 | struct gmidi_device { |
| 121 | spinlock_t lock; |
| 122 | struct usb_gadget *gadget; |
| 123 | struct usb_request *req; /* for control responses */ |
| 124 | u8 config; |
| 125 | struct usb_ep *in_ep, *out_ep; |
| 126 | struct snd_card *card; |
| 127 | struct snd_rawmidi *rmidi; |
| 128 | struct snd_rawmidi_substream *in_substream; |
| 129 | struct snd_rawmidi_substream *out_substream; |
| 130 | |
| 131 | /* For the moment we only support one port in |
| 132 | each direction, but in_port is kept as a |
| 133 | separate struct so we can have more later. */ |
| 134 | struct gmidi_in_port in_port; |
| 135 | unsigned long out_triggered; |
| 136 | struct tasklet_struct tasklet; |
| 137 | }; |
| 138 | |
| 139 | static void gmidi_transmit(struct gmidi_device* dev, struct usb_request* req); |
| 140 | |
| 141 | |
| 142 | #define xprintk(d,level,fmt,args...) \ |
| 143 | dev_printk(level , &(d)->gadget->dev , fmt , ## args) |
| 144 | |
| 145 | #ifdef DEBUG |
| 146 | #define DBG(dev,fmt,args...) \ |
| 147 | xprintk(dev , KERN_DEBUG , fmt , ## args) |
| 148 | #else |
| 149 | #define DBG(dev,fmt,args...) \ |
| 150 | do { } while (0) |
| 151 | #endif /* DEBUG */ |
| 152 | |
| 153 | #ifdef VERBOSE |
| 154 | #define VDBG DBG |
| 155 | #else |
| 156 | #define VDBG(dev,fmt,args...) \ |
| 157 | do { } while (0) |
| 158 | #endif /* VERBOSE */ |
| 159 | |
| 160 | #define ERROR(dev,fmt,args...) \ |
| 161 | xprintk(dev , KERN_ERR , fmt , ## args) |
| 162 | #define WARN(dev,fmt,args...) \ |
| 163 | xprintk(dev , KERN_WARNING , fmt , ## args) |
| 164 | #define INFO(dev,fmt,args...) \ |
| 165 | xprintk(dev , KERN_INFO , fmt , ## args) |
| 166 | |
| 167 | |
| 168 | static unsigned buflen = 256; |
| 169 | static unsigned qlen = 32; |
| 170 | |
| 171 | module_param(buflen, uint, S_IRUGO); |
| 172 | module_param(qlen, uint, S_IRUGO); |
| 173 | |
| 174 | |
| 175 | /* Thanks to Grey Innovation for donating this product ID. |
| 176 | * |
| 177 | * DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!! |
| 178 | * Instead: allocate your own, using normal USB-IF procedures. |
| 179 | */ |
| 180 | #define DRIVER_VENDOR_NUM 0x17b3 /* Grey Innovation */ |
| 181 | #define DRIVER_PRODUCT_NUM 0x0004 /* Linux-USB "MIDI Gadget" */ |
| 182 | |
| 183 | |
| 184 | /* |
| 185 | * DESCRIPTORS ... most are static, but strings and (full) |
| 186 | * configuration descriptors are built on demand. |
| 187 | */ |
| 188 | |
| 189 | #define STRING_MANUFACTURER 25 |
| 190 | #define STRING_PRODUCT 42 |
| 191 | #define STRING_SERIAL 101 |
| 192 | #define STRING_MIDI_GADGET 250 |
| 193 | |
| 194 | /* We only have the one configuration, it's number 1. */ |
| 195 | #define GMIDI_CONFIG 1 |
| 196 | |
| 197 | /* We have two interfaces- AudioControl and MIDIStreaming */ |
| 198 | #define GMIDI_AC_INTERFACE 0 |
| 199 | #define GMIDI_MS_INTERFACE 1 |
| 200 | #define GMIDI_NUM_INTERFACES 2 |
| 201 | |
| 202 | DECLARE_USB_AC_HEADER_DESCRIPTOR(1); |
| 203 | DECLARE_USB_MIDI_OUT_JACK_DESCRIPTOR(1); |
| 204 | DECLARE_USB_MS_ENDPOINT_DESCRIPTOR(1); |
| 205 | |
| 206 | /* B.1 Device Descriptor */ |
| 207 | static struct usb_device_descriptor device_desc = { |
| 208 | .bLength = USB_DT_DEVICE_SIZE, |
| 209 | .bDescriptorType = USB_DT_DEVICE, |
| 210 | .bcdUSB = __constant_cpu_to_le16(0x0200), |
| 211 | .bDeviceClass = USB_CLASS_PER_INTERFACE, |
| 212 | .idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_NUM), |
| 213 | .idProduct = __constant_cpu_to_le16(DRIVER_PRODUCT_NUM), |
| 214 | .iManufacturer = STRING_MANUFACTURER, |
| 215 | .iProduct = STRING_PRODUCT, |
| 216 | .bNumConfigurations = 1, |
| 217 | }; |
| 218 | |
| 219 | /* B.2 Configuration Descriptor */ |
| 220 | static struct usb_config_descriptor config_desc = { |
| 221 | .bLength = USB_DT_CONFIG_SIZE, |
| 222 | .bDescriptorType = USB_DT_CONFIG, |
| 223 | /* compute wTotalLength on the fly */ |
| 224 | .bNumInterfaces = GMIDI_NUM_INTERFACES, |
| 225 | .bConfigurationValue = GMIDI_CONFIG, |
| 226 | .iConfiguration = STRING_MIDI_GADGET, |
| 227 | /* |
| 228 | * FIXME: When embedding this driver in a device, |
| 229 | * these need to be set to reflect the actual |
| 230 | * power properties of the device. Is it selfpowered? |
| 231 | */ |
| 232 | .bmAttributes = USB_CONFIG_ATT_ONE, |
| 233 | .bMaxPower = 1, |
| 234 | }; |
| 235 | |
| 236 | /* B.3.1 Standard AC Interface Descriptor */ |
| 237 | static const struct usb_interface_descriptor ac_interface_desc = { |
| 238 | .bLength = USB_DT_INTERFACE_SIZE, |
| 239 | .bDescriptorType = USB_DT_INTERFACE, |
| 240 | .bInterfaceNumber = GMIDI_AC_INTERFACE, |
| 241 | .bNumEndpoints = 0, |
| 242 | .bInterfaceClass = USB_CLASS_AUDIO, |
| 243 | .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL, |
| 244 | .iInterface = STRING_MIDI_GADGET, |
| 245 | }; |
| 246 | |
| 247 | /* B.3.2 Class-Specific AC Interface Descriptor */ |
| 248 | static const struct usb_ac_header_descriptor_1 ac_header_desc = { |
| 249 | .bLength = USB_DT_AC_HEADER_SIZE(1), |
| 250 | .bDescriptorType = USB_DT_CS_INTERFACE, |
| 251 | .bDescriptorSubtype = USB_MS_HEADER, |
| 252 | .bcdADC = __constant_cpu_to_le16(0x0100), |
| 253 | .wTotalLength = USB_DT_AC_HEADER_SIZE(1), |
| 254 | .bInCollection = 1, |
| 255 | .baInterfaceNr = { |
| 256 | [0] = GMIDI_MS_INTERFACE, |
| 257 | } |
| 258 | }; |
| 259 | |
| 260 | /* B.4.1 Standard MS Interface Descriptor */ |
| 261 | static const struct usb_interface_descriptor ms_interface_desc = { |
| 262 | .bLength = USB_DT_INTERFACE_SIZE, |
| 263 | .bDescriptorType = USB_DT_INTERFACE, |
| 264 | .bInterfaceNumber = GMIDI_MS_INTERFACE, |
| 265 | .bNumEndpoints = 2, |
| 266 | .bInterfaceClass = USB_CLASS_AUDIO, |
| 267 | .bInterfaceSubClass = USB_SUBCLASS_MIDISTREAMING, |
| 268 | .iInterface = STRING_MIDI_GADGET, |
| 269 | }; |
| 270 | |
| 271 | /* B.4.2 Class-Specific MS Interface Descriptor */ |
| 272 | static const struct usb_ms_header_descriptor ms_header_desc = { |
| 273 | .bLength = USB_DT_MS_HEADER_SIZE, |
| 274 | .bDescriptorType = USB_DT_CS_INTERFACE, |
| 275 | .bDescriptorSubtype = USB_MS_HEADER, |
| 276 | .bcdMSC = __constant_cpu_to_le16(0x0100), |
| 277 | .wTotalLength = USB_DT_MS_HEADER_SIZE |
| 278 | + 2*USB_DT_MIDI_IN_SIZE |
| 279 | + 2*USB_DT_MIDI_OUT_SIZE(1), |
| 280 | }; |
| 281 | |
| 282 | #define JACK_IN_EMB 1 |
| 283 | #define JACK_IN_EXT 2 |
| 284 | #define JACK_OUT_EMB 3 |
| 285 | #define JACK_OUT_EXT 4 |
| 286 | |
| 287 | /* B.4.3 MIDI IN Jack Descriptors */ |
| 288 | static const struct usb_midi_in_jack_descriptor jack_in_emb_desc = { |
| 289 | .bLength = USB_DT_MIDI_IN_SIZE, |
| 290 | .bDescriptorType = USB_DT_CS_INTERFACE, |
| 291 | .bDescriptorSubtype = USB_MS_MIDI_IN_JACK, |
| 292 | .bJackType = USB_MS_EMBEDDED, |
| 293 | .bJackID = JACK_IN_EMB, |
| 294 | }; |
| 295 | |
| 296 | static const struct usb_midi_in_jack_descriptor jack_in_ext_desc = { |
| 297 | .bLength = USB_DT_MIDI_IN_SIZE, |
| 298 | .bDescriptorType = USB_DT_CS_INTERFACE, |
| 299 | .bDescriptorSubtype = USB_MS_MIDI_IN_JACK, |
| 300 | .bJackType = USB_MS_EXTERNAL, |
| 301 | .bJackID = JACK_IN_EXT, |
| 302 | }; |
| 303 | |
| 304 | /* B.4.4 MIDI OUT Jack Descriptors */ |
| 305 | static const struct usb_midi_out_jack_descriptor_1 jack_out_emb_desc = { |
| 306 | .bLength = USB_DT_MIDI_OUT_SIZE(1), |
| 307 | .bDescriptorType = USB_DT_CS_INTERFACE, |
| 308 | .bDescriptorSubtype = USB_MS_MIDI_OUT_JACK, |
| 309 | .bJackType = USB_MS_EMBEDDED, |
| 310 | .bJackID = JACK_OUT_EMB, |
| 311 | .bNrInputPins = 1, |
| 312 | .pins = { |
| 313 | [0] = { |
| 314 | .baSourceID = JACK_IN_EXT, |
| 315 | .baSourcePin = 1, |
| 316 | } |
| 317 | } |
| 318 | }; |
| 319 | |
| 320 | static const struct usb_midi_out_jack_descriptor_1 jack_out_ext_desc = { |
| 321 | .bLength = USB_DT_MIDI_OUT_SIZE(1), |
| 322 | .bDescriptorType = USB_DT_CS_INTERFACE, |
| 323 | .bDescriptorSubtype = USB_MS_MIDI_OUT_JACK, |
| 324 | .bJackType = USB_MS_EXTERNAL, |
| 325 | .bJackID = JACK_OUT_EXT, |
| 326 | .bNrInputPins = 1, |
| 327 | .pins = { |
| 328 | [0] = { |
| 329 | .baSourceID = JACK_IN_EMB, |
| 330 | .baSourcePin = 1, |
| 331 | } |
| 332 | } |
| 333 | }; |
| 334 | |
| 335 | /* B.5.1 Standard Bulk OUT Endpoint Descriptor */ |
| 336 | static struct usb_endpoint_descriptor bulk_out_desc = { |
| 337 | .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, |
| 338 | .bDescriptorType = USB_DT_ENDPOINT, |
| 339 | .bEndpointAddress = USB_DIR_OUT, |
| 340 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 341 | }; |
| 342 | |
| 343 | /* B.5.2 Class-specific MS Bulk OUT Endpoint Descriptor */ |
| 344 | static const struct usb_ms_endpoint_descriptor_1 ms_out_desc = { |
| 345 | .bLength = USB_DT_MS_ENDPOINT_SIZE(1), |
| 346 | .bDescriptorType = USB_DT_CS_ENDPOINT, |
| 347 | .bDescriptorSubtype = USB_MS_GENERAL, |
| 348 | .bNumEmbMIDIJack = 1, |
| 349 | .baAssocJackID = { |
| 350 | [0] = JACK_IN_EMB, |
| 351 | } |
| 352 | }; |
| 353 | |
| 354 | /* B.6.1 Standard Bulk IN Endpoint Descriptor */ |
| 355 | static struct usb_endpoint_descriptor bulk_in_desc = { |
| 356 | .bLength = USB_DT_ENDPOINT_AUDIO_SIZE, |
| 357 | .bDescriptorType = USB_DT_ENDPOINT, |
| 358 | .bEndpointAddress = USB_DIR_IN, |
| 359 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 360 | }; |
| 361 | |
| 362 | /* B.6.2 Class-specific MS Bulk IN Endpoint Descriptor */ |
| 363 | static const struct usb_ms_endpoint_descriptor_1 ms_in_desc = { |
| 364 | .bLength = USB_DT_MS_ENDPOINT_SIZE(1), |
| 365 | .bDescriptorType = USB_DT_CS_ENDPOINT, |
| 366 | .bDescriptorSubtype = USB_MS_GENERAL, |
| 367 | .bNumEmbMIDIJack = 1, |
| 368 | .baAssocJackID = { |
| 369 | [0] = JACK_OUT_EMB, |
| 370 | } |
| 371 | }; |
| 372 | |
| 373 | static const struct usb_descriptor_header *gmidi_function [] = { |
| 374 | (struct usb_descriptor_header *)&ac_interface_desc, |
| 375 | (struct usb_descriptor_header *)&ac_header_desc, |
| 376 | (struct usb_descriptor_header *)&ms_interface_desc, |
| 377 | |
| 378 | (struct usb_descriptor_header *)&ms_header_desc, |
| 379 | (struct usb_descriptor_header *)&jack_in_emb_desc, |
| 380 | (struct usb_descriptor_header *)&jack_in_ext_desc, |
| 381 | (struct usb_descriptor_header *)&jack_out_emb_desc, |
| 382 | (struct usb_descriptor_header *)&jack_out_ext_desc, |
| 383 | /* If you add more jacks, update ms_header_desc.wTotalLength */ |
| 384 | |
| 385 | (struct usb_descriptor_header *)&bulk_out_desc, |
| 386 | (struct usb_descriptor_header *)&ms_out_desc, |
| 387 | (struct usb_descriptor_header *)&bulk_in_desc, |
| 388 | (struct usb_descriptor_header *)&ms_in_desc, |
| 389 | NULL, |
| 390 | }; |
| 391 | |
| 392 | static char manufacturer[50]; |
| 393 | static char product_desc[40] = "MIDI Gadget"; |
| 394 | static char serial_number[20]; |
| 395 | |
| 396 | /* static strings, in UTF-8 */ |
| 397 | static struct usb_string strings [] = { |
| 398 | { STRING_MANUFACTURER, manufacturer, }, |
| 399 | { STRING_PRODUCT, product_desc, }, |
| 400 | { STRING_SERIAL, serial_number, }, |
| 401 | { STRING_MIDI_GADGET, longname, }, |
| 402 | { } /* end of list */ |
| 403 | }; |
| 404 | |
| 405 | static struct usb_gadget_strings stringtab = { |
| 406 | .language = 0x0409, /* en-us */ |
| 407 | .strings = strings, |
| 408 | }; |
| 409 | |
| 410 | static int config_buf(struct usb_gadget *gadget, |
| 411 | u8 *buf, u8 type, unsigned index) |
| 412 | { |
| 413 | int len; |
| 414 | |
| 415 | /* only one configuration */ |
| 416 | if (index != 0) { |
| 417 | return -EINVAL; |
| 418 | } |
| 419 | len = usb_gadget_config_buf(&config_desc, |
| 420 | buf, USB_BUFSIZ, gmidi_function); |
| 421 | if (len < 0) { |
| 422 | return len; |
| 423 | } |
| 424 | ((struct usb_config_descriptor *)buf)->bDescriptorType = type; |
| 425 | return len; |
| 426 | } |
| 427 | |
| 428 | static struct usb_request* alloc_ep_req(struct usb_ep *ep, unsigned length) |
| 429 | { |
| 430 | struct usb_request *req; |
| 431 | |
| 432 | req = usb_ep_alloc_request(ep, GFP_ATOMIC); |
| 433 | if (req) { |
| 434 | req->length = length; |
| 435 | req->buf = kmalloc(length, GFP_ATOMIC); |
| 436 | if (!req->buf) { |
| 437 | usb_ep_free_request(ep, req); |
| 438 | req = NULL; |
| 439 | } |
| 440 | } |
| 441 | return req; |
| 442 | } |
| 443 | |
| 444 | static void free_ep_req(struct usb_ep *ep, struct usb_request *req) |
| 445 | { |
| 446 | kfree(req->buf); |
| 447 | usb_ep_free_request(ep, req); |
| 448 | } |
| 449 | |
| 450 | static const uint8_t gmidi_cin_length[] = { |
| 451 | 0, 0, 2, 3, 3, 1, 2, 3, 3, 3, 3, 3, 2, 2, 3, 1 |
| 452 | }; |
| 453 | |
| 454 | /* |
| 455 | * Receives a chunk of MIDI data. |
| 456 | */ |
| 457 | static void gmidi_read_data(struct usb_ep *ep, int cable, |
| 458 | uint8_t* data, int length) |
| 459 | { |
| 460 | struct gmidi_device *dev = ep->driver_data; |
| 461 | /* cable is ignored, because for now we only have one. */ |
| 462 | |
| 463 | if (!dev->out_substream) { |
| 464 | /* Nobody is listening - throw it on the floor. */ |
| 465 | return; |
| 466 | } |
| 467 | if (!test_bit(dev->out_substream->number, &dev->out_triggered)) { |
| 468 | return; |
| 469 | } |
| 470 | snd_rawmidi_receive(dev->out_substream, data, length); |
| 471 | } |
| 472 | |
| 473 | static void gmidi_handle_out_data(struct usb_ep *ep, struct usb_request *req) |
| 474 | { |
| 475 | unsigned i; |
| 476 | u8 *buf = req->buf; |
| 477 | |
| 478 | for (i = 0; i + 3 < req->actual; i += 4) { |
| 479 | if (buf[i] != 0) { |
| 480 | int cable = buf[i] >> 4; |
| 481 | int length = gmidi_cin_length[buf[i] & 0x0f]; |
| 482 | gmidi_read_data(ep, cable, &buf[i + 1], length); |
| 483 | } |
| 484 | } |
| 485 | } |
| 486 | |
| 487 | static void gmidi_complete(struct usb_ep *ep, struct usb_request *req) |
| 488 | { |
| 489 | struct gmidi_device *dev = ep->driver_data; |
| 490 | int status = req->status; |
| 491 | |
| 492 | switch (status) { |
| 493 | case 0: /* normal completion */ |
| 494 | if (ep == dev->out_ep) { |
| 495 | /* we received stuff. |
| 496 | req is queued again, below */ |
| 497 | gmidi_handle_out_data(ep, req); |
| 498 | } else if (ep == dev->in_ep) { |
| 499 | /* our transmit completed. |
| 500 | see if there's more to go. |
| 501 | gmidi_transmit eats req, don't queue it again. */ |
| 502 | gmidi_transmit(dev, req); |
| 503 | return; |
| 504 | } |
| 505 | break; |
| 506 | |
| 507 | /* this endpoint is normally active while we're configured */ |
| 508 | case -ECONNABORTED: /* hardware forced ep reset */ |
| 509 | case -ECONNRESET: /* request dequeued */ |
| 510 | case -ESHUTDOWN: /* disconnect from host */ |
| 511 | VDBG(dev, "%s gone (%d), %d/%d\n", ep->name, status, |
| 512 | req->actual, req->length); |
| 513 | if (ep == dev->out_ep) { |
| 514 | gmidi_handle_out_data(ep, req); |
| 515 | } |
| 516 | free_ep_req(ep, req); |
| 517 | return; |
| 518 | |
| 519 | case -EOVERFLOW: /* buffer overrun on read means that |
| 520 | * we didn't provide a big enough |
| 521 | * buffer. |
| 522 | */ |
| 523 | default: |
| 524 | DBG(dev, "%s complete --> %d, %d/%d\n", ep->name, |
| 525 | status, req->actual, req->length); |
| 526 | break; |
| 527 | case -EREMOTEIO: /* short read */ |
| 528 | break; |
| 529 | } |
| 530 | |
| 531 | status = usb_ep_queue(ep, req, GFP_ATOMIC); |
| 532 | if (status) { |
| 533 | ERROR(dev, "kill %s: resubmit %d bytes --> %d\n", |
| 534 | ep->name, req->length, status); |
| 535 | usb_ep_set_halt(ep); |
| 536 | /* FIXME recover later ... somehow */ |
| 537 | } |
| 538 | } |
| 539 | |
| 540 | static int set_gmidi_config(struct gmidi_device *dev, gfp_t gfp_flags) |
| 541 | { |
| 542 | int err = 0; |
| 543 | struct usb_request *req; |
| 544 | struct usb_ep* ep; |
| 545 | unsigned i; |
| 546 | |
| 547 | err = usb_ep_enable(dev->in_ep, &bulk_in_desc); |
| 548 | if (err) { |
| 549 | ERROR(dev, "can't start %s: %d\n", dev->in_ep->name, err); |
| 550 | goto fail; |
| 551 | } |
| 552 | dev->in_ep->driver_data = dev; |
| 553 | |
| 554 | err = usb_ep_enable(dev->out_ep, &bulk_out_desc); |
| 555 | if (err) { |
| 556 | ERROR(dev, "can't start %s: %d\n", dev->out_ep->name, err); |
| 557 | goto fail; |
| 558 | } |
| 559 | dev->out_ep->driver_data = dev; |
| 560 | |
| 561 | /* allocate a bunch of read buffers and queue them all at once. */ |
| 562 | ep = dev->out_ep; |
| 563 | for (i = 0; i < qlen && err == 0; i++) { |
| 564 | req = alloc_ep_req(ep, buflen); |
| 565 | if (req) { |
| 566 | req->complete = gmidi_complete; |
| 567 | err = usb_ep_queue(ep, req, GFP_ATOMIC); |
| 568 | if (err) { |
| 569 | DBG(dev, "%s queue req: %d\n", ep->name, err); |
| 570 | } |
| 571 | } else { |
| 572 | err = -ENOMEM; |
| 573 | } |
| 574 | } |
| 575 | fail: |
| 576 | /* caller is responsible for cleanup on error */ |
| 577 | return err; |
| 578 | } |
| 579 | |
| 580 | |
| 581 | static void gmidi_reset_config(struct gmidi_device *dev) |
| 582 | { |
| 583 | if (dev->config == 0) { |
| 584 | return; |
| 585 | } |
| 586 | |
| 587 | DBG(dev, "reset config\n"); |
| 588 | |
| 589 | /* just disable endpoints, forcing completion of pending i/o. |
| 590 | * all our completion handlers free their requests in this case. |
| 591 | */ |
| 592 | usb_ep_disable(dev->in_ep); |
| 593 | usb_ep_disable(dev->out_ep); |
| 594 | dev->config = 0; |
| 595 | } |
| 596 | |
| 597 | /* change our operational config. this code must agree with the code |
| 598 | * that returns config descriptors, and altsetting code. |
| 599 | * |
| 600 | * it's also responsible for power management interactions. some |
| 601 | * configurations might not work with our current power sources. |
| 602 | * |
| 603 | * note that some device controller hardware will constrain what this |
| 604 | * code can do, perhaps by disallowing more than one configuration or |
| 605 | * by limiting configuration choices (like the pxa2xx). |
| 606 | */ |
| 607 | static int |
| 608 | gmidi_set_config(struct gmidi_device *dev, unsigned number, gfp_t gfp_flags) |
| 609 | { |
| 610 | int result = 0; |
| 611 | struct usb_gadget *gadget = dev->gadget; |
| 612 | |
| 613 | #if 0 |
| 614 | /* FIXME */ |
| 615 | /* Hacking this bit out fixes a bug where on receipt of two |
| 616 | USB_REQ_SET_CONFIGURATION messages, we end up with no |
| 617 | buffered OUT requests waiting for data. This is clearly |
| 618 | hiding a bug elsewhere, because if the config didn't |
| 619 | change then we really shouldn't do anything. */ |
| 620 | /* Having said that, when we do "change" from config 1 |
| 621 | to config 1, we at least gmidi_reset_config() which |
| 622 | clears out any requests on endpoints, so it's not like |
| 623 | we leak or anything. */ |
| 624 | if (number == dev->config) { |
| 625 | return 0; |
| 626 | } |
| 627 | #endif |
| 628 | |
| 629 | if (gadget_is_sa1100(gadget) && dev->config) { |
| 630 | /* tx fifo is full, but we can't clear it...*/ |
| 631 | INFO(dev, "can't change configurations\n"); |
| 632 | return -ESPIPE; |
| 633 | } |
| 634 | gmidi_reset_config(dev); |
| 635 | |
| 636 | switch (number) { |
| 637 | case GMIDI_CONFIG: |
| 638 | result = set_gmidi_config(dev, gfp_flags); |
| 639 | break; |
| 640 | default: |
| 641 | result = -EINVAL; |
| 642 | /* FALL THROUGH */ |
| 643 | case 0: |
| 644 | return result; |
| 645 | } |
| 646 | |
| 647 | if (!result && (!dev->in_ep || !dev->out_ep)) { |
| 648 | result = -ENODEV; |
| 649 | } |
| 650 | if (result) { |
| 651 | gmidi_reset_config(dev); |
| 652 | } else { |
| 653 | char *speed; |
| 654 | |
| 655 | switch (gadget->speed) { |
| 656 | case USB_SPEED_LOW: speed = "low"; break; |
| 657 | case USB_SPEED_FULL: speed = "full"; break; |
| 658 | case USB_SPEED_HIGH: speed = "high"; break; |
| 659 | default: speed = "?"; break; |
| 660 | } |
| 661 | |
| 662 | dev->config = number; |
| 663 | INFO(dev, "%s speed\n", speed); |
| 664 | } |
| 665 | return result; |
| 666 | } |
| 667 | |
| 668 | |
| 669 | static void gmidi_setup_complete(struct usb_ep *ep, struct usb_request *req) |
| 670 | { |
| 671 | if (req->status || req->actual != req->length) { |
| 672 | DBG((struct gmidi_device *) ep->driver_data, |
| 673 | "setup complete --> %d, %d/%d\n", |
| 674 | req->status, req->actual, req->length); |
| 675 | } |
| 676 | } |
| 677 | |
| 678 | /* |
| 679 | * The setup() callback implements all the ep0 functionality that's |
| 680 | * not handled lower down, in hardware or the hardware driver (like |
| 681 | * device and endpoint feature flags, and their status). It's all |
| 682 | * housekeeping for the gadget function we're implementing. Most of |
| 683 | * the work is in config-specific setup. |
| 684 | */ |
| 685 | static int gmidi_setup(struct usb_gadget *gadget, |
| 686 | const struct usb_ctrlrequest *ctrl) |
| 687 | { |
| 688 | struct gmidi_device *dev = get_gadget_data(gadget); |
| 689 | struct usb_request *req = dev->req; |
| 690 | int value = -EOPNOTSUPP; |
| 691 | u16 w_index = le16_to_cpu(ctrl->wIndex); |
| 692 | u16 w_value = le16_to_cpu(ctrl->wValue); |
| 693 | u16 w_length = le16_to_cpu(ctrl->wLength); |
| 694 | |
| 695 | /* usually this stores reply data in the pre-allocated ep0 buffer, |
| 696 | * but config change events will reconfigure hardware. |
| 697 | */ |
| 698 | req->zero = 0; |
| 699 | switch (ctrl->bRequest) { |
| 700 | |
| 701 | case USB_REQ_GET_DESCRIPTOR: |
| 702 | if (ctrl->bRequestType != USB_DIR_IN) { |
| 703 | goto unknown; |
| 704 | } |
| 705 | switch (w_value >> 8) { |
| 706 | |
| 707 | case USB_DT_DEVICE: |
| 708 | value = min(w_length, (u16) sizeof(device_desc)); |
| 709 | memcpy(req->buf, &device_desc, value); |
| 710 | break; |
| 711 | case USB_DT_CONFIG: |
| 712 | value = config_buf(gadget, req->buf, |
| 713 | w_value >> 8, |
| 714 | w_value & 0xff); |
| 715 | if (value >= 0) { |
| 716 | value = min(w_length, (u16)value); |
| 717 | } |
| 718 | break; |
| 719 | |
| 720 | case USB_DT_STRING: |
| 721 | /* wIndex == language code. |
| 722 | * this driver only handles one language, you can |
| 723 | * add string tables for other languages, using |
| 724 | * any UTF-8 characters |
| 725 | */ |
| 726 | value = usb_gadget_get_string(&stringtab, |
| 727 | w_value & 0xff, req->buf); |
| 728 | if (value >= 0) { |
| 729 | value = min(w_length, (u16)value); |
| 730 | } |
| 731 | break; |
| 732 | } |
| 733 | break; |
| 734 | |
| 735 | /* currently two configs, two speeds */ |
| 736 | case USB_REQ_SET_CONFIGURATION: |
| 737 | if (ctrl->bRequestType != 0) { |
| 738 | goto unknown; |
| 739 | } |
| 740 | if (gadget->a_hnp_support) { |
| 741 | DBG(dev, "HNP available\n"); |
| 742 | } else if (gadget->a_alt_hnp_support) { |
| 743 | DBG(dev, "HNP needs a different root port\n"); |
| 744 | } else { |
| 745 | VDBG(dev, "HNP inactive\n"); |
| 746 | } |
| 747 | spin_lock(&dev->lock); |
| 748 | value = gmidi_set_config(dev, w_value, GFP_ATOMIC); |
| 749 | spin_unlock(&dev->lock); |
| 750 | break; |
| 751 | case USB_REQ_GET_CONFIGURATION: |
| 752 | if (ctrl->bRequestType != USB_DIR_IN) { |
| 753 | goto unknown; |
| 754 | } |
| 755 | *(u8 *)req->buf = dev->config; |
| 756 | value = min(w_length, (u16)1); |
| 757 | break; |
| 758 | |
| 759 | /* until we add altsetting support, or other interfaces, |
| 760 | * only 0/0 are possible. pxa2xx only supports 0/0 (poorly) |
| 761 | * and already killed pending endpoint I/O. |
| 762 | */ |
| 763 | case USB_REQ_SET_INTERFACE: |
| 764 | if (ctrl->bRequestType != USB_RECIP_INTERFACE) { |
| 765 | goto unknown; |
| 766 | } |
| 767 | spin_lock(&dev->lock); |
| 768 | if (dev->config && w_index < GMIDI_NUM_INTERFACES |
| 769 | && w_value == 0) |
| 770 | { |
| 771 | u8 config = dev->config; |
| 772 | |
| 773 | /* resets interface configuration, forgets about |
| 774 | * previous transaction state (queued bufs, etc) |
| 775 | * and re-inits endpoint state (toggle etc) |
| 776 | * no response queued, just zero status == success. |
| 777 | * if we had more than one interface we couldn't |
| 778 | * use this "reset the config" shortcut. |
| 779 | */ |
| 780 | gmidi_reset_config(dev); |
| 781 | gmidi_set_config(dev, config, GFP_ATOMIC); |
| 782 | value = 0; |
| 783 | } |
| 784 | spin_unlock(&dev->lock); |
| 785 | break; |
| 786 | case USB_REQ_GET_INTERFACE: |
| 787 | if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)) { |
| 788 | goto unknown; |
| 789 | } |
| 790 | if (!dev->config) { |
| 791 | break; |
| 792 | } |
| 793 | if (w_index >= GMIDI_NUM_INTERFACES) { |
| 794 | value = -EDOM; |
| 795 | break; |
| 796 | } |
| 797 | *(u8 *)req->buf = 0; |
| 798 | value = min(w_length, (u16)1); |
| 799 | break; |
| 800 | |
| 801 | default: |
| 802 | unknown: |
| 803 | VDBG(dev, "unknown control req%02x.%02x v%04x i%04x l%d\n", |
| 804 | ctrl->bRequestType, ctrl->bRequest, |
| 805 | w_value, w_index, w_length); |
| 806 | } |
| 807 | |
| 808 | /* respond with data transfer before status phase? */ |
| 809 | if (value >= 0) { |
| 810 | req->length = value; |
| 811 | req->zero = value < w_length; |
| 812 | value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC); |
| 813 | if (value < 0) { |
| 814 | DBG(dev, "ep_queue --> %d\n", value); |
| 815 | req->status = 0; |
| 816 | gmidi_setup_complete(gadget->ep0, req); |
| 817 | } |
| 818 | } |
| 819 | |
| 820 | /* device either stalls (value < 0) or reports success */ |
| 821 | return value; |
| 822 | } |
| 823 | |
| 824 | static void gmidi_disconnect(struct usb_gadget *gadget) |
| 825 | { |
| 826 | struct gmidi_device *dev = get_gadget_data(gadget); |
| 827 | unsigned long flags; |
| 828 | |
| 829 | spin_lock_irqsave(&dev->lock, flags); |
| 830 | gmidi_reset_config(dev); |
| 831 | |
| 832 | /* a more significant application might have some non-usb |
| 833 | * activities to quiesce here, saving resources like power |
| 834 | * or pushing the notification up a network stack. |
| 835 | */ |
| 836 | spin_unlock_irqrestore(&dev->lock, flags); |
| 837 | |
| 838 | /* next we may get setup() calls to enumerate new connections; |
| 839 | * or an unbind() during shutdown (including removing module). |
| 840 | */ |
| 841 | } |
| 842 | |
| 843 | static void /* __init_or_exit */ gmidi_unbind(struct usb_gadget *gadget) |
| 844 | { |
| 845 | struct gmidi_device *dev = get_gadget_data(gadget); |
| 846 | struct snd_card* card; |
| 847 | |
| 848 | DBG(dev, "unbind\n"); |
| 849 | |
| 850 | card = dev->card; |
| 851 | dev->card = NULL; |
| 852 | if (card) { |
| 853 | snd_card_free(card); |
| 854 | } |
| 855 | |
| 856 | /* we've already been disconnected ... no i/o is active */ |
| 857 | if (dev->req) { |
| 858 | dev->req->length = USB_BUFSIZ; |
| 859 | free_ep_req(gadget->ep0, dev->req); |
| 860 | } |
| 861 | kfree(dev); |
| 862 | set_gadget_data(gadget, NULL); |
| 863 | } |
| 864 | |
| 865 | static int gmidi_snd_free(struct snd_device *device) |
| 866 | { |
| 867 | return 0; |
| 868 | } |
| 869 | |
| 870 | static void gmidi_transmit_packet(struct usb_request* req, uint8_t p0, |
| 871 | uint8_t p1, uint8_t p2, uint8_t p3) |
| 872 | { |
| 873 | unsigned length = req->length; |
| 874 | |
| 875 | uint8_t* buf = (uint8_t*)req->buf + length; |
| 876 | buf[0] = p0; |
| 877 | buf[1] = p1; |
| 878 | buf[2] = p2; |
| 879 | buf[3] = p3; |
| 880 | req->length = length + 4; |
| 881 | } |
| 882 | |
| 883 | /* |
| 884 | * Converts MIDI commands to USB MIDI packets. |
| 885 | */ |
| 886 | static void gmidi_transmit_byte(struct usb_request* req, |
| 887 | struct gmidi_in_port* port, uint8_t b) |
| 888 | { |
| 889 | uint8_t p0 = port->cable; |
| 890 | |
| 891 | if (b >= 0xf8) { |
| 892 | gmidi_transmit_packet(req, p0 | 0x0f, b, 0, 0); |
| 893 | } else if (b >= 0xf0) { |
| 894 | switch (b) { |
| 895 | case 0xf0: |
| 896 | port->data[0] = b; |
| 897 | port->state = STATE_SYSEX_1; |
| 898 | break; |
| 899 | case 0xf1: |
| 900 | case 0xf3: |
| 901 | port->data[0] = b; |
| 902 | port->state = STATE_1PARAM; |
| 903 | break; |
| 904 | case 0xf2: |
| 905 | port->data[0] = b; |
| 906 | port->state = STATE_2PARAM_1; |
| 907 | break; |
| 908 | case 0xf4: |
| 909 | case 0xf5: |
| 910 | port->state = STATE_UNKNOWN; |
| 911 | break; |
| 912 | case 0xf6: |
| 913 | gmidi_transmit_packet(req, p0 | 0x05, 0xf6, 0, 0); |
| 914 | port->state = STATE_UNKNOWN; |
| 915 | break; |
| 916 | case 0xf7: |
| 917 | switch (port->state) { |
| 918 | case STATE_SYSEX_0: |
| 919 | gmidi_transmit_packet(req, |
| 920 | p0 | 0x05, 0xf7, 0, 0); |
| 921 | break; |
| 922 | case STATE_SYSEX_1: |
| 923 | gmidi_transmit_packet(req, |
| 924 | p0 | 0x06, port->data[0], 0xf7, 0); |
| 925 | break; |
| 926 | case STATE_SYSEX_2: |
| 927 | gmidi_transmit_packet(req, |
| 928 | p0 | 0x07, port->data[0], |
| 929 | port->data[1], 0xf7); |
| 930 | break; |
| 931 | } |
| 932 | port->state = STATE_UNKNOWN; |
| 933 | break; |
| 934 | } |
| 935 | } else if (b >= 0x80) { |
| 936 | port->data[0] = b; |
| 937 | if (b >= 0xc0 && b <= 0xdf) |
| 938 | port->state = STATE_1PARAM; |
| 939 | else |
| 940 | port->state = STATE_2PARAM_1; |
| 941 | } else { /* b < 0x80 */ |
| 942 | switch (port->state) { |
| 943 | case STATE_1PARAM: |
| 944 | if (port->data[0] < 0xf0) { |
| 945 | p0 |= port->data[0] >> 4; |
| 946 | } else { |
| 947 | p0 |= 0x02; |
| 948 | port->state = STATE_UNKNOWN; |
| 949 | } |
| 950 | gmidi_transmit_packet(req, p0, port->data[0], b, 0); |
| 951 | break; |
| 952 | case STATE_2PARAM_1: |
| 953 | port->data[1] = b; |
| 954 | port->state = STATE_2PARAM_2; |
| 955 | break; |
| 956 | case STATE_2PARAM_2: |
| 957 | if (port->data[0] < 0xf0) { |
| 958 | p0 |= port->data[0] >> 4; |
| 959 | port->state = STATE_2PARAM_1; |
| 960 | } else { |
| 961 | p0 |= 0x03; |
| 962 | port->state = STATE_UNKNOWN; |
| 963 | } |
| 964 | gmidi_transmit_packet(req, |
| 965 | p0, port->data[0], port->data[1], b); |
| 966 | break; |
| 967 | case STATE_SYSEX_0: |
| 968 | port->data[0] = b; |
| 969 | port->state = STATE_SYSEX_1; |
| 970 | break; |
| 971 | case STATE_SYSEX_1: |
| 972 | port->data[1] = b; |
| 973 | port->state = STATE_SYSEX_2; |
| 974 | break; |
| 975 | case STATE_SYSEX_2: |
| 976 | gmidi_transmit_packet(req, |
| 977 | p0 | 0x04, port->data[0], port->data[1], b); |
| 978 | port->state = STATE_SYSEX_0; |
| 979 | break; |
| 980 | } |
| 981 | } |
| 982 | } |
| 983 | |
| 984 | static void gmidi_transmit(struct gmidi_device* dev, struct usb_request* req) |
| 985 | { |
| 986 | struct usb_ep* ep = dev->in_ep; |
| 987 | struct gmidi_in_port* port = &dev->in_port; |
| 988 | |
| 989 | if (!ep) { |
| 990 | return; |
| 991 | } |
| 992 | if (!req) { |
| 993 | req = alloc_ep_req(ep, buflen); |
| 994 | } |
| 995 | if (!req) { |
| 996 | ERROR(dev, "gmidi_transmit: alloc_ep_request failed\n"); |
| 997 | return; |
| 998 | } |
| 999 | req->length = 0; |
| 1000 | req->complete = gmidi_complete; |
| 1001 | |
| 1002 | if (port->active) { |
| 1003 | while (req->length + 3 < buflen) { |
| 1004 | uint8_t b; |
| 1005 | if (snd_rawmidi_transmit(dev->in_substream, &b, 1) |
| 1006 | != 1) |
| 1007 | { |
| 1008 | port->active = 0; |
| 1009 | break; |
| 1010 | } |
| 1011 | gmidi_transmit_byte(req, port, b); |
| 1012 | } |
| 1013 | } |
| 1014 | if (req->length > 0) { |
| 1015 | usb_ep_queue(ep, req, GFP_ATOMIC); |
| 1016 | } else { |
| 1017 | free_ep_req(ep, req); |
| 1018 | } |
| 1019 | } |
| 1020 | |
| 1021 | static void gmidi_in_tasklet(unsigned long data) |
| 1022 | { |
| 1023 | struct gmidi_device* dev = (struct gmidi_device*)data; |
| 1024 | |
| 1025 | gmidi_transmit(dev, NULL); |
| 1026 | } |
| 1027 | |
| 1028 | static int gmidi_in_open(struct snd_rawmidi_substream *substream) |
| 1029 | { |
| 1030 | struct gmidi_device* dev = substream->rmidi->private_data; |
| 1031 | |
| 1032 | VDBG(dev, "gmidi_in_open\n"); |
| 1033 | dev->in_substream = substream; |
| 1034 | dev->in_port.state = STATE_UNKNOWN; |
| 1035 | return 0; |
| 1036 | } |
| 1037 | |
| 1038 | static int gmidi_in_close(struct snd_rawmidi_substream *substream) |
| 1039 | { |
| 1040 | VDBG(dev, "gmidi_in_close\n"); |
| 1041 | return 0; |
| 1042 | } |
| 1043 | |
| 1044 | static void gmidi_in_trigger(struct snd_rawmidi_substream *substream, int up) |
| 1045 | { |
| 1046 | struct gmidi_device* dev = substream->rmidi->private_data; |
| 1047 | |
| 1048 | VDBG(dev, "gmidi_in_trigger %d\n", up); |
| 1049 | dev->in_port.active = up; |
| 1050 | if (up) { |
| 1051 | tasklet_hi_schedule(&dev->tasklet); |
| 1052 | } |
| 1053 | } |
| 1054 | |
| 1055 | static int gmidi_out_open(struct snd_rawmidi_substream *substream) |
| 1056 | { |
| 1057 | struct gmidi_device* dev = substream->rmidi->private_data; |
| 1058 | |
| 1059 | VDBG(dev, "gmidi_out_open\n"); |
| 1060 | dev->out_substream = substream; |
| 1061 | return 0; |
| 1062 | } |
| 1063 | |
| 1064 | static int gmidi_out_close(struct snd_rawmidi_substream *substream) |
| 1065 | { |
| 1066 | VDBG(dev, "gmidi_out_close\n"); |
| 1067 | return 0; |
| 1068 | } |
| 1069 | |
| 1070 | static void gmidi_out_trigger(struct snd_rawmidi_substream *substream, int up) |
| 1071 | { |
| 1072 | struct gmidi_device* dev = substream->rmidi->private_data; |
| 1073 | |
| 1074 | VDBG(dev, "gmidi_out_trigger %d\n", up); |
| 1075 | if (up) { |
| 1076 | set_bit(substream->number, &dev->out_triggered); |
| 1077 | } else { |
| 1078 | clear_bit(substream->number, &dev->out_triggered); |
| 1079 | } |
| 1080 | } |
| 1081 | |
| 1082 | static struct snd_rawmidi_ops gmidi_in_ops = { |
| 1083 | .open = gmidi_in_open, |
| 1084 | .close = gmidi_in_close, |
| 1085 | .trigger = gmidi_in_trigger, |
| 1086 | }; |
| 1087 | |
| 1088 | static struct snd_rawmidi_ops gmidi_out_ops = { |
| 1089 | .open = gmidi_out_open, |
| 1090 | .close = gmidi_out_close, |
| 1091 | .trigger = gmidi_out_trigger |
| 1092 | }; |
| 1093 | |
| 1094 | /* register as a sound "card" */ |
| 1095 | static int gmidi_register_card(struct gmidi_device *dev) |
| 1096 | { |
| 1097 | struct snd_card *card; |
| 1098 | struct snd_rawmidi *rmidi; |
| 1099 | int err; |
| 1100 | int out_ports = 1; |
| 1101 | int in_ports = 1; |
| 1102 | static struct snd_device_ops ops = { |
| 1103 | .dev_free = gmidi_snd_free, |
| 1104 | }; |
| 1105 | |
| 1106 | card = snd_card_new(index, id, THIS_MODULE, 0); |
| 1107 | if (!card) { |
| 1108 | ERROR(dev, "snd_card_new failed\n"); |
| 1109 | err = -ENOMEM; |
| 1110 | goto fail; |
| 1111 | } |
| 1112 | dev->card = card; |
| 1113 | |
| 1114 | err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, dev, &ops); |
| 1115 | if (err < 0) { |
| 1116 | ERROR(dev, "snd_device_new failed: error %d\n", err); |
| 1117 | goto fail; |
| 1118 | } |
| 1119 | |
| 1120 | strcpy(card->driver, longname); |
| 1121 | strcpy(card->longname, longname); |
| 1122 | strcpy(card->shortname, shortname); |
| 1123 | |
| 1124 | /* Set up rawmidi */ |
| 1125 | dev->in_port.dev = dev; |
| 1126 | dev->in_port.active = 0; |
| 1127 | snd_component_add(card, "MIDI"); |
| 1128 | err = snd_rawmidi_new(card, "USB MIDI Gadget", 0, |
| 1129 | out_ports, in_ports, &rmidi); |
| 1130 | if (err < 0) { |
| 1131 | ERROR(dev, "snd_rawmidi_new failed: error %d\n", err); |
| 1132 | goto fail; |
| 1133 | } |
| 1134 | dev->rmidi = rmidi; |
| 1135 | strcpy(rmidi->name, card->shortname); |
| 1136 | rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT | |
| 1137 | SNDRV_RAWMIDI_INFO_INPUT | |
| 1138 | SNDRV_RAWMIDI_INFO_DUPLEX; |
| 1139 | rmidi->private_data = dev; |
| 1140 | |
| 1141 | /* Yes, rawmidi OUTPUT = USB IN, and rawmidi INPUT = USB OUT. |
| 1142 | It's an upside-down world being a gadget. */ |
| 1143 | snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &gmidi_in_ops); |
| 1144 | snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &gmidi_out_ops); |
| 1145 | |
| 1146 | snd_card_set_dev(card, &dev->gadget->dev); |
| 1147 | |
| 1148 | /* register it - we're ready to go */ |
| 1149 | err = snd_card_register(card); |
| 1150 | if (err < 0) { |
| 1151 | ERROR(dev, "snd_card_register failed\n"); |
| 1152 | goto fail; |
| 1153 | } |
| 1154 | |
| 1155 | VDBG(dev, "gmidi_register_card finished ok\n"); |
| 1156 | return 0; |
| 1157 | |
| 1158 | fail: |
| 1159 | if (dev->card) { |
| 1160 | snd_card_free(dev->card); |
| 1161 | dev->card = NULL; |
| 1162 | } |
| 1163 | return err; |
| 1164 | } |
| 1165 | |
| 1166 | /* |
| 1167 | * Creates an output endpoint, and initializes output ports. |
| 1168 | */ |
| 1169 | static int __devinit gmidi_bind(struct usb_gadget *gadget) |
| 1170 | { |
| 1171 | struct gmidi_device *dev; |
| 1172 | struct usb_ep *in_ep, *out_ep; |
| 1173 | int gcnum, err = 0; |
| 1174 | |
| 1175 | /* support optional vendor/distro customization */ |
| 1176 | if (idVendor) { |
| 1177 | if (!idProduct) { |
| 1178 | printk(KERN_ERR "idVendor needs idProduct!\n"); |
| 1179 | return -ENODEV; |
| 1180 | } |
| 1181 | device_desc.idVendor = cpu_to_le16(idVendor); |
| 1182 | device_desc.idProduct = cpu_to_le16(idProduct); |
| 1183 | if (bcdDevice) { |
| 1184 | device_desc.bcdDevice = cpu_to_le16(bcdDevice); |
| 1185 | } |
| 1186 | } |
| 1187 | if (iManufacturer) { |
| 1188 | strlcpy(manufacturer, iManufacturer, sizeof(manufacturer)); |
| 1189 | } else { |
| 1190 | snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s", |
Serge E. Hallyn | 96b644b | 2006-10-02 02:18:13 -0700 | [diff] [blame] | 1191 | init_utsname()->sysname, init_utsname()->release, |
Ben Williamson | f2ebf92c | 2006-08-01 11:28:16 +1000 | [diff] [blame] | 1192 | gadget->name); |
| 1193 | } |
| 1194 | if (iProduct) { |
| 1195 | strlcpy(product_desc, iProduct, sizeof(product_desc)); |
| 1196 | } |
| 1197 | if (iSerialNumber) { |
| 1198 | device_desc.iSerialNumber = STRING_SERIAL, |
| 1199 | strlcpy(serial_number, iSerialNumber, sizeof(serial_number)); |
| 1200 | } |
| 1201 | |
| 1202 | /* Bulk-only drivers like this one SHOULD be able to |
| 1203 | * autoconfigure on any sane usb controller driver, |
| 1204 | * but there may also be important quirks to address. |
| 1205 | */ |
| 1206 | usb_ep_autoconfig_reset(gadget); |
| 1207 | in_ep = usb_ep_autoconfig(gadget, &bulk_in_desc); |
| 1208 | if (!in_ep) { |
| 1209 | autoconf_fail: |
| 1210 | printk(KERN_ERR "%s: can't autoconfigure on %s\n", |
| 1211 | shortname, gadget->name); |
| 1212 | return -ENODEV; |
| 1213 | } |
| 1214 | EP_IN_NAME = in_ep->name; |
| 1215 | in_ep->driver_data = in_ep; /* claim */ |
| 1216 | |
| 1217 | out_ep = usb_ep_autoconfig(gadget, &bulk_out_desc); |
| 1218 | if (!out_ep) { |
| 1219 | goto autoconf_fail; |
| 1220 | } |
| 1221 | EP_OUT_NAME = out_ep->name; |
| 1222 | out_ep->driver_data = out_ep; /* claim */ |
| 1223 | |
| 1224 | gcnum = usb_gadget_controller_number(gadget); |
| 1225 | if (gcnum >= 0) { |
| 1226 | device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum); |
| 1227 | } else { |
| 1228 | /* gmidi is so simple (no altsettings) that |
| 1229 | * it SHOULD NOT have problems with bulk-capable hardware. |
| 1230 | * so warn about unrecognized controllers, don't panic. |
| 1231 | */ |
| 1232 | printk(KERN_WARNING "%s: controller '%s' not recognized\n", |
| 1233 | shortname, gadget->name); |
| 1234 | device_desc.bcdDevice = __constant_cpu_to_le16(0x9999); |
| 1235 | } |
| 1236 | |
| 1237 | |
| 1238 | /* ok, we made sense of the hardware ... */ |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 1239 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
Ben Williamson | f2ebf92c | 2006-08-01 11:28:16 +1000 | [diff] [blame] | 1240 | if (!dev) { |
| 1241 | return -ENOMEM; |
| 1242 | } |
| 1243 | spin_lock_init(&dev->lock); |
| 1244 | dev->gadget = gadget; |
| 1245 | dev->in_ep = in_ep; |
| 1246 | dev->out_ep = out_ep; |
| 1247 | set_gadget_data(gadget, dev); |
| 1248 | tasklet_init(&dev->tasklet, gmidi_in_tasklet, (unsigned long)dev); |
| 1249 | |
| 1250 | /* preallocate control response and buffer */ |
| 1251 | dev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL); |
| 1252 | if (!dev->req) { |
| 1253 | err = -ENOMEM; |
| 1254 | goto fail; |
| 1255 | } |
| 1256 | dev->req->buf = usb_ep_alloc_buffer(gadget->ep0, USB_BUFSIZ, |
| 1257 | &dev->req->dma, GFP_KERNEL); |
| 1258 | if (!dev->req->buf) { |
| 1259 | err = -ENOMEM; |
| 1260 | goto fail; |
| 1261 | } |
| 1262 | |
| 1263 | dev->req->complete = gmidi_setup_complete; |
| 1264 | |
| 1265 | device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket; |
| 1266 | |
| 1267 | gadget->ep0->driver_data = dev; |
| 1268 | |
| 1269 | INFO(dev, "%s, version: " DRIVER_VERSION "\n", longname); |
| 1270 | INFO(dev, "using %s, OUT %s IN %s\n", gadget->name, |
| 1271 | EP_OUT_NAME, EP_IN_NAME); |
| 1272 | |
| 1273 | /* register as an ALSA sound card */ |
| 1274 | err = gmidi_register_card(dev); |
| 1275 | if (err < 0) { |
| 1276 | goto fail; |
| 1277 | } |
| 1278 | |
| 1279 | VDBG(dev, "gmidi_bind finished ok\n"); |
| 1280 | return 0; |
| 1281 | |
| 1282 | fail: |
| 1283 | gmidi_unbind(gadget); |
| 1284 | return err; |
| 1285 | } |
| 1286 | |
| 1287 | |
| 1288 | static void gmidi_suspend(struct usb_gadget *gadget) |
| 1289 | { |
| 1290 | struct gmidi_device *dev = get_gadget_data(gadget); |
| 1291 | |
| 1292 | if (gadget->speed == USB_SPEED_UNKNOWN) { |
| 1293 | return; |
| 1294 | } |
| 1295 | |
| 1296 | DBG(dev, "suspend\n"); |
| 1297 | } |
| 1298 | |
| 1299 | static void gmidi_resume(struct usb_gadget *gadget) |
| 1300 | { |
| 1301 | struct gmidi_device *dev = get_gadget_data(gadget); |
| 1302 | |
| 1303 | DBG(dev, "resume\n"); |
| 1304 | } |
| 1305 | |
| 1306 | |
| 1307 | static struct usb_gadget_driver gmidi_driver = { |
| 1308 | .speed = USB_SPEED_FULL, |
| 1309 | .function = (char *)longname, |
| 1310 | .bind = gmidi_bind, |
| 1311 | .unbind = __exit_p(gmidi_unbind), |
| 1312 | |
| 1313 | .setup = gmidi_setup, |
| 1314 | .disconnect = gmidi_disconnect, |
| 1315 | |
| 1316 | .suspend = gmidi_suspend, |
| 1317 | .resume = gmidi_resume, |
| 1318 | |
| 1319 | .driver = { |
| 1320 | .name = (char *)shortname, |
| 1321 | .owner = THIS_MODULE, |
| 1322 | }, |
| 1323 | }; |
| 1324 | |
| 1325 | static int __init gmidi_init(void) |
| 1326 | { |
| 1327 | return usb_gadget_register_driver(&gmidi_driver); |
| 1328 | } |
| 1329 | module_init(gmidi_init); |
| 1330 | |
| 1331 | static void __exit gmidi_cleanup(void) |
| 1332 | { |
| 1333 | usb_gadget_unregister_driver(&gmidi_driver); |
| 1334 | } |
| 1335 | module_exit(gmidi_cleanup); |
| 1336 | |