Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Gadget Function Driver for Android USB accessories |
| 3 | * |
| 4 | * Copyright (C) 2011 Google, Inc. |
| 5 | * Author: Mike Lockwood <lockwood@android.com> |
| 6 | * |
| 7 | * This software is licensed under the terms of the GNU General Public |
| 8 | * License version 2, as published by the Free Software Foundation, and |
| 9 | * may be copied, distributed, and modified under those terms. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | */ |
| 17 | |
| 18 | /* #define DEBUG */ |
| 19 | /* #define VERBOSE_DEBUG */ |
| 20 | |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/poll.h> |
| 24 | #include <linux/delay.h> |
| 25 | #include <linux/wait.h> |
| 26 | #include <linux/err.h> |
| 27 | #include <linux/interrupt.h> |
| 28 | #include <linux/kthread.h> |
| 29 | #include <linux/freezer.h> |
| 30 | |
| 31 | #include <linux/types.h> |
| 32 | #include <linux/file.h> |
| 33 | #include <linux/device.h> |
| 34 | #include <linux/miscdevice.h> |
| 35 | |
Mike Lockwood | 205115d | 2012-03-26 11:03:55 -0700 | [diff] [blame^] | 36 | #include <linux/hid.h> |
| 37 | #include <linux/hiddev.h> |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 38 | #include <linux/usb.h> |
| 39 | #include <linux/usb/ch9.h> |
| 40 | #include <linux/usb/f_accessory.h> |
| 41 | |
| 42 | #define BULK_BUFFER_SIZE 16384 |
| 43 | #define ACC_STRING_SIZE 256 |
| 44 | |
Mike Lockwood | b16cf28 | 2012-05-11 09:00:40 -0700 | [diff] [blame] | 45 | #define PROTOCOL_VERSION 2 |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 46 | |
| 47 | /* String IDs */ |
| 48 | #define INTERFACE_STRING_INDEX 0 |
| 49 | |
| 50 | /* number of tx and rx requests to allocate */ |
| 51 | #define TX_REQ_MAX 4 |
| 52 | #define RX_REQ_MAX 2 |
| 53 | |
Mike Lockwood | 205115d | 2012-03-26 11:03:55 -0700 | [diff] [blame^] | 54 | struct acc_hid_dev { |
| 55 | struct list_head list; |
| 56 | struct hid_device *hid; |
| 57 | struct acc_dev *dev; |
| 58 | /* accessory defined ID */ |
| 59 | int id; |
| 60 | /* HID report descriptor */ |
| 61 | u8 *report_desc; |
| 62 | /* length of HID report descriptor */ |
| 63 | int report_desc_len; |
| 64 | /* number of bytes of report_desc we have received so far */ |
| 65 | int report_desc_offset; |
| 66 | }; |
| 67 | |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 68 | struct acc_dev { |
| 69 | struct usb_function function; |
| 70 | struct usb_composite_dev *cdev; |
| 71 | spinlock_t lock; |
| 72 | |
| 73 | struct usb_ep *ep_in; |
| 74 | struct usb_ep *ep_out; |
| 75 | |
| 76 | /* set to 1 when we connect */ |
| 77 | int online:1; |
| 78 | /* Set to 1 when we disconnect. |
| 79 | * Not cleared until our file is closed. |
| 80 | */ |
| 81 | int disconnected:1; |
| 82 | |
| 83 | /* strings sent by the host */ |
| 84 | char manufacturer[ACC_STRING_SIZE]; |
| 85 | char model[ACC_STRING_SIZE]; |
| 86 | char description[ACC_STRING_SIZE]; |
| 87 | char version[ACC_STRING_SIZE]; |
| 88 | char uri[ACC_STRING_SIZE]; |
| 89 | char serial[ACC_STRING_SIZE]; |
| 90 | |
| 91 | /* for acc_complete_set_string */ |
| 92 | int string_index; |
| 93 | |
| 94 | /* set to 1 if we have a pending start request */ |
| 95 | int start_requested; |
| 96 | |
Mike Lockwood | b16cf28 | 2012-05-11 09:00:40 -0700 | [diff] [blame] | 97 | int audio_mode; |
| 98 | |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 99 | /* synchronize access to our device file */ |
| 100 | atomic_t open_excl; |
| 101 | |
| 102 | struct list_head tx_idle; |
| 103 | |
| 104 | wait_queue_head_t read_wq; |
| 105 | wait_queue_head_t write_wq; |
| 106 | struct usb_request *rx_req[RX_REQ_MAX]; |
| 107 | int rx_done; |
Mike Lockwood | 205115d | 2012-03-26 11:03:55 -0700 | [diff] [blame^] | 108 | |
| 109 | /* delayed work for handling ACCESSORY_START */ |
| 110 | struct delayed_work start_work; |
| 111 | |
| 112 | /* worker for registering and unregistering hid devices */ |
| 113 | struct work_struct hid_work; |
| 114 | |
| 115 | /* list of active HID devices */ |
| 116 | struct list_head hid_list; |
| 117 | |
| 118 | /* list of new HID devices to register */ |
| 119 | struct list_head new_hid_list; |
| 120 | |
| 121 | /* list of dead HID devices to unregister */ |
| 122 | struct list_head dead_hid_list; |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 123 | }; |
| 124 | |
| 125 | static struct usb_interface_descriptor acc_interface_desc = { |
| 126 | .bLength = USB_DT_INTERFACE_SIZE, |
| 127 | .bDescriptorType = USB_DT_INTERFACE, |
| 128 | .bInterfaceNumber = 0, |
| 129 | .bNumEndpoints = 2, |
| 130 | .bInterfaceClass = USB_CLASS_VENDOR_SPEC, |
| 131 | .bInterfaceSubClass = USB_SUBCLASS_VENDOR_SPEC, |
| 132 | .bInterfaceProtocol = 0, |
| 133 | }; |
| 134 | |
| 135 | static struct usb_endpoint_descriptor acc_highspeed_in_desc = { |
| 136 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 137 | .bDescriptorType = USB_DT_ENDPOINT, |
| 138 | .bEndpointAddress = USB_DIR_IN, |
| 139 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 140 | .wMaxPacketSize = __constant_cpu_to_le16(512), |
| 141 | }; |
| 142 | |
| 143 | static struct usb_endpoint_descriptor acc_highspeed_out_desc = { |
| 144 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 145 | .bDescriptorType = USB_DT_ENDPOINT, |
| 146 | .bEndpointAddress = USB_DIR_OUT, |
| 147 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 148 | .wMaxPacketSize = __constant_cpu_to_le16(512), |
| 149 | }; |
| 150 | |
| 151 | static struct usb_endpoint_descriptor acc_fullspeed_in_desc = { |
| 152 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 153 | .bDescriptorType = USB_DT_ENDPOINT, |
| 154 | .bEndpointAddress = USB_DIR_IN, |
| 155 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 156 | }; |
| 157 | |
| 158 | static struct usb_endpoint_descriptor acc_fullspeed_out_desc = { |
| 159 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 160 | .bDescriptorType = USB_DT_ENDPOINT, |
| 161 | .bEndpointAddress = USB_DIR_OUT, |
| 162 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 163 | }; |
| 164 | |
| 165 | static struct usb_descriptor_header *fs_acc_descs[] = { |
| 166 | (struct usb_descriptor_header *) &acc_interface_desc, |
| 167 | (struct usb_descriptor_header *) &acc_fullspeed_in_desc, |
| 168 | (struct usb_descriptor_header *) &acc_fullspeed_out_desc, |
| 169 | NULL, |
| 170 | }; |
| 171 | |
| 172 | static struct usb_descriptor_header *hs_acc_descs[] = { |
| 173 | (struct usb_descriptor_header *) &acc_interface_desc, |
| 174 | (struct usb_descriptor_header *) &acc_highspeed_in_desc, |
| 175 | (struct usb_descriptor_header *) &acc_highspeed_out_desc, |
| 176 | NULL, |
| 177 | }; |
| 178 | |
| 179 | static struct usb_string acc_string_defs[] = { |
| 180 | [INTERFACE_STRING_INDEX].s = "Android Accessory Interface", |
| 181 | { }, /* end of list */ |
| 182 | }; |
| 183 | |
| 184 | static struct usb_gadget_strings acc_string_table = { |
| 185 | .language = 0x0409, /* en-US */ |
| 186 | .strings = acc_string_defs, |
| 187 | }; |
| 188 | |
| 189 | static struct usb_gadget_strings *acc_strings[] = { |
| 190 | &acc_string_table, |
| 191 | NULL, |
| 192 | }; |
| 193 | |
| 194 | /* temporary variable used between acc_open() and acc_gadget_bind() */ |
| 195 | static struct acc_dev *_acc_dev; |
| 196 | |
| 197 | static inline struct acc_dev *func_to_dev(struct usb_function *f) |
| 198 | { |
| 199 | return container_of(f, struct acc_dev, function); |
| 200 | } |
| 201 | |
| 202 | static struct usb_request *acc_request_new(struct usb_ep *ep, int buffer_size) |
| 203 | { |
| 204 | struct usb_request *req = usb_ep_alloc_request(ep, GFP_KERNEL); |
| 205 | if (!req) |
| 206 | return NULL; |
| 207 | |
| 208 | /* now allocate buffers for the requests */ |
| 209 | req->buf = kmalloc(buffer_size, GFP_KERNEL); |
| 210 | if (!req->buf) { |
| 211 | usb_ep_free_request(ep, req); |
| 212 | return NULL; |
| 213 | } |
| 214 | |
| 215 | return req; |
| 216 | } |
| 217 | |
| 218 | static void acc_request_free(struct usb_request *req, struct usb_ep *ep) |
| 219 | { |
| 220 | if (req) { |
| 221 | kfree(req->buf); |
| 222 | usb_ep_free_request(ep, req); |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | /* add a request to the tail of a list */ |
| 227 | static void req_put(struct acc_dev *dev, struct list_head *head, |
| 228 | struct usb_request *req) |
| 229 | { |
| 230 | unsigned long flags; |
| 231 | |
| 232 | spin_lock_irqsave(&dev->lock, flags); |
| 233 | list_add_tail(&req->list, head); |
| 234 | spin_unlock_irqrestore(&dev->lock, flags); |
| 235 | } |
| 236 | |
| 237 | /* remove a request from the head of a list */ |
| 238 | static struct usb_request *req_get(struct acc_dev *dev, struct list_head *head) |
| 239 | { |
| 240 | unsigned long flags; |
| 241 | struct usb_request *req; |
| 242 | |
| 243 | spin_lock_irqsave(&dev->lock, flags); |
| 244 | if (list_empty(head)) { |
| 245 | req = 0; |
| 246 | } else { |
| 247 | req = list_first_entry(head, struct usb_request, list); |
| 248 | list_del(&req->list); |
| 249 | } |
| 250 | spin_unlock_irqrestore(&dev->lock, flags); |
| 251 | return req; |
| 252 | } |
| 253 | |
| 254 | static void acc_set_disconnected(struct acc_dev *dev) |
| 255 | { |
| 256 | dev->online = 0; |
| 257 | dev->disconnected = 1; |
| 258 | } |
| 259 | |
| 260 | static void acc_complete_in(struct usb_ep *ep, struct usb_request *req) |
| 261 | { |
| 262 | struct acc_dev *dev = _acc_dev; |
| 263 | |
| 264 | if (req->status != 0) |
| 265 | acc_set_disconnected(dev); |
| 266 | |
| 267 | req_put(dev, &dev->tx_idle, req); |
| 268 | |
| 269 | wake_up(&dev->write_wq); |
| 270 | } |
| 271 | |
| 272 | static void acc_complete_out(struct usb_ep *ep, struct usb_request *req) |
| 273 | { |
| 274 | struct acc_dev *dev = _acc_dev; |
| 275 | |
| 276 | dev->rx_done = 1; |
| 277 | if (req->status != 0) |
| 278 | acc_set_disconnected(dev); |
| 279 | |
| 280 | wake_up(&dev->read_wq); |
| 281 | } |
| 282 | |
| 283 | static void acc_complete_set_string(struct usb_ep *ep, struct usb_request *req) |
| 284 | { |
| 285 | struct acc_dev *dev = ep->driver_data; |
| 286 | char *string_dest = NULL; |
| 287 | int length = req->actual; |
| 288 | |
| 289 | if (req->status != 0) { |
| 290 | pr_err("acc_complete_set_string, err %d\n", req->status); |
| 291 | return; |
| 292 | } |
| 293 | |
| 294 | switch (dev->string_index) { |
| 295 | case ACCESSORY_STRING_MANUFACTURER: |
| 296 | string_dest = dev->manufacturer; |
| 297 | break; |
| 298 | case ACCESSORY_STRING_MODEL: |
| 299 | string_dest = dev->model; |
| 300 | break; |
| 301 | case ACCESSORY_STRING_DESCRIPTION: |
| 302 | string_dest = dev->description; |
| 303 | break; |
| 304 | case ACCESSORY_STRING_VERSION: |
| 305 | string_dest = dev->version; |
| 306 | break; |
| 307 | case ACCESSORY_STRING_URI: |
| 308 | string_dest = dev->uri; |
| 309 | break; |
| 310 | case ACCESSORY_STRING_SERIAL: |
| 311 | string_dest = dev->serial; |
| 312 | break; |
| 313 | } |
| 314 | if (string_dest) { |
| 315 | unsigned long flags; |
| 316 | |
| 317 | if (length >= ACC_STRING_SIZE) |
| 318 | length = ACC_STRING_SIZE - 1; |
| 319 | |
| 320 | spin_lock_irqsave(&dev->lock, flags); |
| 321 | memcpy(string_dest, req->buf, length); |
| 322 | /* ensure zero termination */ |
| 323 | string_dest[length] = 0; |
| 324 | spin_unlock_irqrestore(&dev->lock, flags); |
| 325 | } else { |
| 326 | pr_err("unknown accessory string index %d\n", |
| 327 | dev->string_index); |
| 328 | } |
| 329 | } |
| 330 | |
Mike Lockwood | 205115d | 2012-03-26 11:03:55 -0700 | [diff] [blame^] | 331 | static void acc_complete_set_hid_report_desc(struct usb_ep *ep, |
| 332 | struct usb_request *req) |
| 333 | { |
| 334 | struct acc_hid_dev *hid = req->context; |
| 335 | struct acc_dev *dev = hid->dev; |
| 336 | int length = req->actual; |
| 337 | |
| 338 | if (req->status != 0) { |
| 339 | pr_err("acc_complete_set_hid_report_desc, err %d\n", |
| 340 | req->status); |
| 341 | return; |
| 342 | } |
| 343 | |
| 344 | memcpy(hid->report_desc + hid->report_desc_offset, req->buf, length); |
| 345 | hid->report_desc_offset += length; |
| 346 | if (hid->report_desc_offset == hid->report_desc_len) { |
| 347 | /* After we have received the entire report descriptor |
| 348 | * we schedule work to initialize the HID device |
| 349 | */ |
| 350 | schedule_work(&dev->hid_work); |
| 351 | } |
| 352 | } |
| 353 | |
| 354 | static void acc_complete_send_hid_event(struct usb_ep *ep, |
| 355 | struct usb_request *req) |
| 356 | { |
| 357 | struct acc_hid_dev *hid = req->context; |
| 358 | int length = req->actual; |
| 359 | |
| 360 | if (req->status != 0) { |
| 361 | pr_err("acc_complete_send_hid_event, err %d\n", req->status); |
| 362 | return; |
| 363 | } |
| 364 | |
| 365 | hid_report_raw_event(hid->hid, HID_INPUT_REPORT, req->buf, length, 1); |
| 366 | } |
| 367 | |
| 368 | static int acc_hid_parse(struct hid_device *hid) |
| 369 | { |
| 370 | struct acc_hid_dev *hdev = hid->driver_data; |
| 371 | |
| 372 | hid_parse_report(hid, hdev->report_desc, hdev->report_desc_len); |
| 373 | return 0; |
| 374 | } |
| 375 | |
| 376 | static int acc_hid_start(struct hid_device *hid) |
| 377 | { |
| 378 | return 0; |
| 379 | } |
| 380 | |
| 381 | static void acc_hid_stop(struct hid_device *hid) |
| 382 | { |
| 383 | } |
| 384 | |
| 385 | static int acc_hid_open(struct hid_device *hid) |
| 386 | { |
| 387 | return 0; |
| 388 | } |
| 389 | |
| 390 | static void acc_hid_close(struct hid_device *hid) |
| 391 | { |
| 392 | } |
| 393 | |
| 394 | static struct hid_ll_driver acc_hid_ll_driver = { |
| 395 | .parse = acc_hid_parse, |
| 396 | .start = acc_hid_start, |
| 397 | .stop = acc_hid_stop, |
| 398 | .open = acc_hid_open, |
| 399 | .close = acc_hid_close, |
| 400 | }; |
| 401 | |
| 402 | static struct acc_hid_dev *acc_hid_new(struct acc_dev *dev, |
| 403 | int id, int desc_len) |
| 404 | { |
| 405 | struct acc_hid_dev *hdev; |
| 406 | |
| 407 | hdev = kzalloc(sizeof(*hdev), GFP_ATOMIC); |
| 408 | if (!hdev) |
| 409 | return NULL; |
| 410 | hdev->report_desc = kzalloc(desc_len, GFP_ATOMIC); |
| 411 | if (!hdev->report_desc) { |
| 412 | kfree(hdev); |
| 413 | return NULL; |
| 414 | } |
| 415 | hdev->dev = dev; |
| 416 | hdev->id = id; |
| 417 | hdev->report_desc_len = desc_len; |
| 418 | |
| 419 | return hdev; |
| 420 | } |
| 421 | |
| 422 | static struct acc_hid_dev *acc_hid_get(struct list_head *list, int id) |
| 423 | { |
| 424 | struct acc_hid_dev *hid; |
| 425 | |
| 426 | list_for_each_entry(hid, list, list) { |
| 427 | if (hid->id == id) |
| 428 | return hid; |
| 429 | } |
| 430 | return NULL; |
| 431 | } |
| 432 | |
| 433 | static int acc_register_hid(struct acc_dev *dev, int id, int desc_length) |
| 434 | { |
| 435 | struct acc_hid_dev *hid; |
| 436 | unsigned long flags; |
| 437 | |
| 438 | /* report descriptor length must be > 0 */ |
| 439 | if (desc_length <= 0) |
| 440 | return -EINVAL; |
| 441 | |
| 442 | spin_lock_irqsave(&dev->lock, flags); |
| 443 | /* replace HID if one already exists with this ID */ |
| 444 | hid = acc_hid_get(&dev->hid_list, id); |
| 445 | if (!hid) |
| 446 | hid = acc_hid_get(&dev->new_hid_list, id); |
| 447 | if (hid) |
| 448 | list_move(&hid->list, &dev->dead_hid_list); |
| 449 | |
| 450 | hid = acc_hid_new(dev, id, desc_length); |
| 451 | if (!hid) { |
| 452 | spin_unlock_irqrestore(&dev->lock, flags); |
| 453 | return -ENOMEM; |
| 454 | } |
| 455 | |
| 456 | list_add(&hid->list, &dev->new_hid_list); |
| 457 | spin_unlock_irqrestore(&dev->lock, flags); |
| 458 | |
| 459 | /* schedule work to register the HID device */ |
| 460 | schedule_work(&dev->hid_work); |
| 461 | return 0; |
| 462 | } |
| 463 | |
| 464 | static int acc_unregister_hid(struct acc_dev *dev, int id) |
| 465 | { |
| 466 | struct acc_hid_dev *hid; |
| 467 | unsigned long flags; |
| 468 | |
| 469 | spin_lock_irqsave(&dev->lock, flags); |
| 470 | hid = acc_hid_get(&dev->hid_list, id); |
| 471 | if (!hid) |
| 472 | hid = acc_hid_get(&dev->new_hid_list, id); |
| 473 | if (!hid) { |
| 474 | spin_unlock_irqrestore(&dev->lock, flags); |
| 475 | return -EINVAL; |
| 476 | } |
| 477 | |
| 478 | list_move(&hid->list, &dev->dead_hid_list); |
| 479 | spin_unlock_irqrestore(&dev->lock, flags); |
| 480 | |
| 481 | schedule_work(&dev->hid_work); |
| 482 | return 0; |
| 483 | } |
| 484 | |
| 485 | static int __init create_bulk_endpoints(struct acc_dev *dev, |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 486 | struct usb_endpoint_descriptor *in_desc, |
| 487 | struct usb_endpoint_descriptor *out_desc) |
| 488 | { |
| 489 | struct usb_composite_dev *cdev = dev->cdev; |
| 490 | struct usb_request *req; |
| 491 | struct usb_ep *ep; |
| 492 | int i; |
| 493 | |
| 494 | DBG(cdev, "create_bulk_endpoints dev: %p\n", dev); |
| 495 | |
| 496 | ep = usb_ep_autoconfig(cdev->gadget, in_desc); |
| 497 | if (!ep) { |
| 498 | DBG(cdev, "usb_ep_autoconfig for ep_in failed\n"); |
| 499 | return -ENODEV; |
| 500 | } |
| 501 | DBG(cdev, "usb_ep_autoconfig for ep_in got %s\n", ep->name); |
| 502 | ep->driver_data = dev; /* claim the endpoint */ |
| 503 | dev->ep_in = ep; |
| 504 | |
| 505 | ep = usb_ep_autoconfig(cdev->gadget, out_desc); |
| 506 | if (!ep) { |
| 507 | DBG(cdev, "usb_ep_autoconfig for ep_out failed\n"); |
| 508 | return -ENODEV; |
| 509 | } |
| 510 | DBG(cdev, "usb_ep_autoconfig for ep_out got %s\n", ep->name); |
| 511 | ep->driver_data = dev; /* claim the endpoint */ |
| 512 | dev->ep_out = ep; |
| 513 | |
| 514 | ep = usb_ep_autoconfig(cdev->gadget, out_desc); |
| 515 | if (!ep) { |
| 516 | DBG(cdev, "usb_ep_autoconfig for ep_out failed\n"); |
| 517 | return -ENODEV; |
| 518 | } |
| 519 | DBG(cdev, "usb_ep_autoconfig for ep_out got %s\n", ep->name); |
| 520 | ep->driver_data = dev; /* claim the endpoint */ |
| 521 | dev->ep_out = ep; |
| 522 | |
| 523 | /* now allocate requests for our endpoints */ |
| 524 | for (i = 0; i < TX_REQ_MAX; i++) { |
| 525 | req = acc_request_new(dev->ep_in, BULK_BUFFER_SIZE); |
| 526 | if (!req) |
| 527 | goto fail; |
| 528 | req->complete = acc_complete_in; |
| 529 | req_put(dev, &dev->tx_idle, req); |
| 530 | } |
| 531 | for (i = 0; i < RX_REQ_MAX; i++) { |
| 532 | req = acc_request_new(dev->ep_out, BULK_BUFFER_SIZE); |
| 533 | if (!req) |
| 534 | goto fail; |
| 535 | req->complete = acc_complete_out; |
| 536 | dev->rx_req[i] = req; |
| 537 | } |
| 538 | |
| 539 | return 0; |
| 540 | |
| 541 | fail: |
Mike Lockwood | 205115d | 2012-03-26 11:03:55 -0700 | [diff] [blame^] | 542 | pr_err("acc_bind() could not allocate requests\n"); |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 543 | while ((req = req_get(dev, &dev->tx_idle))) |
| 544 | acc_request_free(req, dev->ep_in); |
| 545 | for (i = 0; i < RX_REQ_MAX; i++) |
| 546 | acc_request_free(dev->rx_req[i], dev->ep_out); |
| 547 | return -1; |
| 548 | } |
| 549 | |
| 550 | static ssize_t acc_read(struct file *fp, char __user *buf, |
| 551 | size_t count, loff_t *pos) |
| 552 | { |
| 553 | struct acc_dev *dev = fp->private_data; |
| 554 | struct usb_request *req; |
| 555 | int r = count, xfer; |
| 556 | int ret = 0; |
| 557 | |
| 558 | pr_debug("acc_read(%d)\n", count); |
| 559 | |
| 560 | if (dev->disconnected) |
| 561 | return -ENODEV; |
| 562 | |
| 563 | if (count > BULK_BUFFER_SIZE) |
| 564 | count = BULK_BUFFER_SIZE; |
| 565 | |
| 566 | /* we will block until we're online */ |
| 567 | pr_debug("acc_read: waiting for online\n"); |
| 568 | ret = wait_event_interruptible(dev->read_wq, dev->online); |
| 569 | if (ret < 0) { |
| 570 | r = ret; |
| 571 | goto done; |
| 572 | } |
| 573 | |
| 574 | requeue_req: |
| 575 | /* queue a request */ |
| 576 | req = dev->rx_req[0]; |
| 577 | req->length = count; |
| 578 | dev->rx_done = 0; |
| 579 | ret = usb_ep_queue(dev->ep_out, req, GFP_KERNEL); |
| 580 | if (ret < 0) { |
| 581 | r = -EIO; |
| 582 | goto done; |
| 583 | } else { |
| 584 | pr_debug("rx %p queue\n", req); |
| 585 | } |
| 586 | |
| 587 | /* wait for a request to complete */ |
| 588 | ret = wait_event_interruptible(dev->read_wq, dev->rx_done); |
| 589 | if (ret < 0) { |
| 590 | r = ret; |
| 591 | usb_ep_dequeue(dev->ep_out, req); |
| 592 | goto done; |
| 593 | } |
| 594 | if (dev->online) { |
| 595 | /* If we got a 0-len packet, throw it back and try again. */ |
| 596 | if (req->actual == 0) |
| 597 | goto requeue_req; |
| 598 | |
| 599 | pr_debug("rx %p %d\n", req, req->actual); |
| 600 | xfer = (req->actual < count) ? req->actual : count; |
| 601 | r = xfer; |
| 602 | if (copy_to_user(buf, req->buf, xfer)) |
| 603 | r = -EFAULT; |
| 604 | } else |
| 605 | r = -EIO; |
| 606 | |
| 607 | done: |
| 608 | pr_debug("acc_read returning %d\n", r); |
| 609 | return r; |
| 610 | } |
| 611 | |
| 612 | static ssize_t acc_write(struct file *fp, const char __user *buf, |
| 613 | size_t count, loff_t *pos) |
| 614 | { |
| 615 | struct acc_dev *dev = fp->private_data; |
| 616 | struct usb_request *req = 0; |
| 617 | int r = count, xfer; |
| 618 | int ret; |
| 619 | |
| 620 | pr_debug("acc_write(%d)\n", count); |
| 621 | |
| 622 | if (!dev->online || dev->disconnected) |
| 623 | return -ENODEV; |
| 624 | |
| 625 | while (count > 0) { |
| 626 | if (!dev->online) { |
| 627 | pr_debug("acc_write dev->error\n"); |
| 628 | r = -EIO; |
| 629 | break; |
| 630 | } |
| 631 | |
| 632 | /* get an idle tx request to use */ |
| 633 | req = 0; |
| 634 | ret = wait_event_interruptible(dev->write_wq, |
| 635 | ((req = req_get(dev, &dev->tx_idle)) || !dev->online)); |
| 636 | if (!req) { |
| 637 | r = ret; |
| 638 | break; |
| 639 | } |
| 640 | |
| 641 | if (count > BULK_BUFFER_SIZE) |
| 642 | xfer = BULK_BUFFER_SIZE; |
| 643 | else |
| 644 | xfer = count; |
| 645 | if (copy_from_user(req->buf, buf, xfer)) { |
| 646 | r = -EFAULT; |
| 647 | break; |
| 648 | } |
| 649 | |
| 650 | req->length = xfer; |
| 651 | ret = usb_ep_queue(dev->ep_in, req, GFP_KERNEL); |
| 652 | if (ret < 0) { |
| 653 | pr_debug("acc_write: xfer error %d\n", ret); |
| 654 | r = -EIO; |
| 655 | break; |
| 656 | } |
| 657 | |
| 658 | buf += xfer; |
| 659 | count -= xfer; |
| 660 | |
| 661 | /* zero this so we don't try to free it on error exit */ |
| 662 | req = 0; |
| 663 | } |
| 664 | |
| 665 | if (req) |
| 666 | req_put(dev, &dev->tx_idle, req); |
| 667 | |
| 668 | pr_debug("acc_write returning %d\n", r); |
| 669 | return r; |
| 670 | } |
| 671 | |
| 672 | static long acc_ioctl(struct file *fp, unsigned code, unsigned long value) |
| 673 | { |
| 674 | struct acc_dev *dev = fp->private_data; |
| 675 | char *src = NULL; |
| 676 | int ret; |
| 677 | |
| 678 | switch (code) { |
| 679 | case ACCESSORY_GET_STRING_MANUFACTURER: |
| 680 | src = dev->manufacturer; |
| 681 | break; |
| 682 | case ACCESSORY_GET_STRING_MODEL: |
| 683 | src = dev->model; |
| 684 | break; |
| 685 | case ACCESSORY_GET_STRING_DESCRIPTION: |
| 686 | src = dev->description; |
| 687 | break; |
| 688 | case ACCESSORY_GET_STRING_VERSION: |
| 689 | src = dev->version; |
| 690 | break; |
| 691 | case ACCESSORY_GET_STRING_URI: |
| 692 | src = dev->uri; |
| 693 | break; |
| 694 | case ACCESSORY_GET_STRING_SERIAL: |
| 695 | src = dev->serial; |
| 696 | break; |
| 697 | case ACCESSORY_IS_START_REQUESTED: |
| 698 | return dev->start_requested; |
Mike Lockwood | b16cf28 | 2012-05-11 09:00:40 -0700 | [diff] [blame] | 699 | case ACCESSORY_GET_AUDIO_MODE: |
| 700 | return dev->audio_mode; |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 701 | } |
| 702 | if (!src) |
| 703 | return -EINVAL; |
| 704 | |
| 705 | ret = strlen(src) + 1; |
| 706 | if (copy_to_user((void __user *)value, src, ret)) |
| 707 | ret = -EFAULT; |
| 708 | return ret; |
| 709 | } |
| 710 | |
| 711 | static int acc_open(struct inode *ip, struct file *fp) |
| 712 | { |
| 713 | printk(KERN_INFO "acc_open\n"); |
| 714 | if (atomic_xchg(&_acc_dev->open_excl, 1)) |
| 715 | return -EBUSY; |
| 716 | |
| 717 | _acc_dev->disconnected = 0; |
| 718 | fp->private_data = _acc_dev; |
| 719 | return 0; |
| 720 | } |
| 721 | |
| 722 | static int acc_release(struct inode *ip, struct file *fp) |
| 723 | { |
| 724 | printk(KERN_INFO "acc_release\n"); |
| 725 | |
| 726 | WARN_ON(!atomic_xchg(&_acc_dev->open_excl, 0)); |
| 727 | _acc_dev->disconnected = 0; |
| 728 | return 0; |
| 729 | } |
| 730 | |
Mike Lockwood | 205115d | 2012-03-26 11:03:55 -0700 | [diff] [blame^] | 731 | /* file operations for /dev/usb_accessory */ |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 732 | static const struct file_operations acc_fops = { |
| 733 | .owner = THIS_MODULE, |
| 734 | .read = acc_read, |
| 735 | .write = acc_write, |
| 736 | .unlocked_ioctl = acc_ioctl, |
| 737 | .open = acc_open, |
| 738 | .release = acc_release, |
| 739 | }; |
| 740 | |
Mike Lockwood | 205115d | 2012-03-26 11:03:55 -0700 | [diff] [blame^] | 741 | static int acc_hid_probe(struct hid_device *hdev, |
| 742 | const struct hid_device_id *id) |
| 743 | { |
| 744 | int ret; |
| 745 | |
| 746 | ret = hid_parse(hdev); |
| 747 | if (ret) |
| 748 | return ret; |
| 749 | return hid_hw_start(hdev, HID_CONNECT_DEFAULT); |
| 750 | } |
| 751 | |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 752 | static struct miscdevice acc_device = { |
| 753 | .minor = MISC_DYNAMIC_MINOR, |
| 754 | .name = "usb_accessory", |
| 755 | .fops = &acc_fops, |
| 756 | }; |
| 757 | |
Mike Lockwood | 205115d | 2012-03-26 11:03:55 -0700 | [diff] [blame^] | 758 | static const struct hid_device_id acc_hid_table[] = { |
| 759 | { HID_USB_DEVICE(HID_ANY_ID, HID_ANY_ID) }, |
| 760 | { } |
| 761 | }; |
| 762 | |
| 763 | static struct hid_driver acc_hid_driver = { |
| 764 | .name = "USB accessory", |
| 765 | .id_table = acc_hid_table, |
| 766 | .probe = acc_hid_probe, |
| 767 | }; |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 768 | |
| 769 | static int acc_ctrlrequest(struct usb_composite_dev *cdev, |
| 770 | const struct usb_ctrlrequest *ctrl) |
| 771 | { |
| 772 | struct acc_dev *dev = _acc_dev; |
| 773 | int value = -EOPNOTSUPP; |
Mike Lockwood | 205115d | 2012-03-26 11:03:55 -0700 | [diff] [blame^] | 774 | struct acc_hid_dev *hid; |
| 775 | int offset; |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 776 | u8 b_requestType = ctrl->bRequestType; |
| 777 | u8 b_request = ctrl->bRequest; |
| 778 | u16 w_index = le16_to_cpu(ctrl->wIndex); |
| 779 | u16 w_value = le16_to_cpu(ctrl->wValue); |
| 780 | u16 w_length = le16_to_cpu(ctrl->wLength); |
Mike Lockwood | 205115d | 2012-03-26 11:03:55 -0700 | [diff] [blame^] | 781 | unsigned long flags; |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 782 | |
| 783 | /* |
| 784 | printk(KERN_INFO "acc_ctrlrequest " |
| 785 | "%02x.%02x v%04x i%04x l%u\n", |
| 786 | b_requestType, b_request, |
| 787 | w_value, w_index, w_length); |
| 788 | */ |
| 789 | |
| 790 | if (b_requestType == (USB_DIR_OUT | USB_TYPE_VENDOR)) { |
| 791 | if (b_request == ACCESSORY_START) { |
| 792 | dev->start_requested = 1; |
| 793 | schedule_delayed_work( |
Mike Lockwood | 205115d | 2012-03-26 11:03:55 -0700 | [diff] [blame^] | 794 | &dev->start_work, msecs_to_jiffies(10)); |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 795 | value = 0; |
| 796 | } else if (b_request == ACCESSORY_SEND_STRING) { |
| 797 | dev->string_index = w_index; |
| 798 | cdev->gadget->ep0->driver_data = dev; |
| 799 | cdev->req->complete = acc_complete_set_string; |
| 800 | value = w_length; |
Mike Lockwood | b16cf28 | 2012-05-11 09:00:40 -0700 | [diff] [blame] | 801 | } else if (b_request == ACCESSORY_SET_AUDIO_MODE && |
| 802 | w_index == 0 && w_length == 0) { |
| 803 | dev->audio_mode = w_value; |
| 804 | value = 0; |
Mike Lockwood | 205115d | 2012-03-26 11:03:55 -0700 | [diff] [blame^] | 805 | } else if (b_request == ACCESSORY_REGISTER_HID) { |
| 806 | value = acc_register_hid(dev, w_value, w_index); |
| 807 | } else if (b_request == ACCESSORY_UNREGISTER_HID) { |
| 808 | value = acc_unregister_hid(dev, w_value); |
| 809 | } else if (b_request == ACCESSORY_SET_HID_REPORT_DESC) { |
| 810 | spin_lock_irqsave(&dev->lock, flags); |
| 811 | hid = acc_hid_get(&dev->new_hid_list, w_value); |
| 812 | spin_unlock_irqrestore(&dev->lock, flags); |
| 813 | if (!hid) { |
| 814 | value = -EINVAL; |
| 815 | goto err; |
| 816 | } |
| 817 | offset = w_index; |
| 818 | if (offset != hid->report_desc_offset |
| 819 | || offset + w_length > hid->report_desc_len) { |
| 820 | value = -EINVAL; |
| 821 | goto err; |
| 822 | } |
| 823 | cdev->req->context = hid; |
| 824 | cdev->req->complete = acc_complete_set_hid_report_desc; |
| 825 | value = w_length; |
| 826 | } else if (b_request == ACCESSORY_SEND_HID_EVENT) { |
| 827 | spin_lock_irqsave(&dev->lock, flags); |
| 828 | hid = acc_hid_get(&dev->hid_list, w_value); |
| 829 | spin_unlock_irqrestore(&dev->lock, flags); |
| 830 | if (!hid) { |
| 831 | value = -EINVAL; |
| 832 | goto err; |
| 833 | } |
| 834 | cdev->req->context = hid; |
| 835 | cdev->req->complete = acc_complete_send_hid_event; |
| 836 | value = w_length; |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 837 | } |
| 838 | } else if (b_requestType == (USB_DIR_IN | USB_TYPE_VENDOR)) { |
| 839 | if (b_request == ACCESSORY_GET_PROTOCOL) { |
| 840 | *((u16 *)cdev->req->buf) = PROTOCOL_VERSION; |
| 841 | value = sizeof(u16); |
| 842 | |
| 843 | /* clear any string left over from a previous session */ |
| 844 | memset(dev->manufacturer, 0, sizeof(dev->manufacturer)); |
| 845 | memset(dev->model, 0, sizeof(dev->model)); |
| 846 | memset(dev->description, 0, sizeof(dev->description)); |
| 847 | memset(dev->version, 0, sizeof(dev->version)); |
| 848 | memset(dev->uri, 0, sizeof(dev->uri)); |
| 849 | memset(dev->serial, 0, sizeof(dev->serial)); |
| 850 | dev->start_requested = 0; |
Mike Lockwood | b16cf28 | 2012-05-11 09:00:40 -0700 | [diff] [blame] | 851 | dev->audio_mode = 0; |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 852 | } |
| 853 | } |
| 854 | |
| 855 | if (value >= 0) { |
| 856 | cdev->req->zero = 0; |
| 857 | cdev->req->length = value; |
| 858 | value = usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC); |
| 859 | if (value < 0) |
| 860 | ERROR(cdev, "%s setup response queue error\n", |
| 861 | __func__); |
| 862 | } |
| 863 | |
Mike Lockwood | 205115d | 2012-03-26 11:03:55 -0700 | [diff] [blame^] | 864 | err: |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 865 | if (value == -EOPNOTSUPP) |
| 866 | VDBG(cdev, |
| 867 | "unknown class-specific control req " |
| 868 | "%02x.%02x v%04x i%04x l%u\n", |
| 869 | ctrl->bRequestType, ctrl->bRequest, |
| 870 | w_value, w_index, w_length); |
| 871 | return value; |
| 872 | } |
| 873 | |
| 874 | static int |
| 875 | acc_function_bind(struct usb_configuration *c, struct usb_function *f) |
| 876 | { |
| 877 | struct usb_composite_dev *cdev = c->cdev; |
| 878 | struct acc_dev *dev = func_to_dev(f); |
| 879 | int id; |
| 880 | int ret; |
| 881 | |
| 882 | DBG(cdev, "acc_function_bind dev: %p\n", dev); |
| 883 | |
Mike Lockwood | 205115d | 2012-03-26 11:03:55 -0700 | [diff] [blame^] | 884 | ret = hid_register_driver(&acc_hid_driver); |
| 885 | if (ret) |
| 886 | return ret; |
| 887 | |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 888 | dev->start_requested = 0; |
| 889 | |
| 890 | /* allocate interface ID(s) */ |
| 891 | id = usb_interface_id(c, f); |
| 892 | if (id < 0) |
| 893 | return id; |
| 894 | acc_interface_desc.bInterfaceNumber = id; |
| 895 | |
| 896 | /* allocate endpoints */ |
| 897 | ret = create_bulk_endpoints(dev, &acc_fullspeed_in_desc, |
| 898 | &acc_fullspeed_out_desc); |
| 899 | if (ret) |
| 900 | return ret; |
| 901 | |
| 902 | /* support high speed hardware */ |
| 903 | if (gadget_is_dualspeed(c->cdev->gadget)) { |
| 904 | acc_highspeed_in_desc.bEndpointAddress = |
| 905 | acc_fullspeed_in_desc.bEndpointAddress; |
| 906 | acc_highspeed_out_desc.bEndpointAddress = |
| 907 | acc_fullspeed_out_desc.bEndpointAddress; |
| 908 | } |
| 909 | |
| 910 | DBG(cdev, "%s speed %s: IN/%s, OUT/%s\n", |
| 911 | gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full", |
| 912 | f->name, dev->ep_in->name, dev->ep_out->name); |
| 913 | return 0; |
| 914 | } |
| 915 | |
| 916 | static void |
Mike Lockwood | 205115d | 2012-03-26 11:03:55 -0700 | [diff] [blame^] | 917 | kill_all_hid_devices(struct acc_dev *dev) |
| 918 | { |
| 919 | struct acc_hid_dev *hid; |
| 920 | struct list_head *entry, *temp; |
| 921 | unsigned long flags; |
| 922 | |
| 923 | spin_lock_irqsave(&dev->lock, flags); |
| 924 | list_for_each_safe(entry, temp, &dev->hid_list) { |
| 925 | hid = list_entry(entry, struct acc_hid_dev, list); |
| 926 | list_del(&hid->list); |
| 927 | list_add(&hid->list, &dev->dead_hid_list); |
| 928 | } |
| 929 | list_for_each_safe(entry, temp, &dev->new_hid_list) { |
| 930 | hid = list_entry(entry, struct acc_hid_dev, list); |
| 931 | list_del(&hid->list); |
| 932 | list_add(&hid->list, &dev->dead_hid_list); |
| 933 | } |
| 934 | spin_unlock_irqrestore(&dev->lock, flags); |
| 935 | |
| 936 | schedule_work(&dev->hid_work); |
| 937 | } |
| 938 | |
| 939 | static void |
| 940 | acc_hid_unbind(struct acc_dev *dev) |
| 941 | { |
| 942 | hid_unregister_driver(&acc_hid_driver); |
| 943 | kill_all_hid_devices(dev); |
| 944 | } |
| 945 | |
| 946 | static void |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 947 | acc_function_unbind(struct usb_configuration *c, struct usb_function *f) |
| 948 | { |
| 949 | struct acc_dev *dev = func_to_dev(f); |
| 950 | struct usb_request *req; |
| 951 | int i; |
| 952 | |
| 953 | while ((req = req_get(dev, &dev->tx_idle))) |
| 954 | acc_request_free(req, dev->ep_in); |
| 955 | for (i = 0; i < RX_REQ_MAX; i++) |
| 956 | acc_request_free(dev->rx_req[i], dev->ep_out); |
Mike Lockwood | 205115d | 2012-03-26 11:03:55 -0700 | [diff] [blame^] | 957 | |
| 958 | acc_hid_unbind(dev); |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 959 | } |
| 960 | |
Mike Lockwood | 205115d | 2012-03-26 11:03:55 -0700 | [diff] [blame^] | 961 | static void acc_start_work(struct work_struct *data) |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 962 | { |
| 963 | char *envp[2] = { "ACCESSORY=START", NULL }; |
| 964 | kobject_uevent_env(&acc_device.this_device->kobj, KOBJ_CHANGE, envp); |
| 965 | } |
| 966 | |
Mike Lockwood | 205115d | 2012-03-26 11:03:55 -0700 | [diff] [blame^] | 967 | static int acc_hid_init(struct acc_hid_dev *hdev) |
| 968 | { |
| 969 | struct hid_device *hid; |
| 970 | int ret; |
| 971 | |
| 972 | hid = hid_allocate_device(); |
| 973 | if (IS_ERR(hid)) |
| 974 | return PTR_ERR(hid); |
| 975 | |
| 976 | hid->ll_driver = &acc_hid_ll_driver; |
| 977 | hid->dev.parent = acc_device.this_device; |
| 978 | |
| 979 | hid->bus = BUS_USB; |
| 980 | hid->vendor = HID_ANY_ID; |
| 981 | hid->product = HID_ANY_ID; |
| 982 | hid->driver_data = hdev; |
| 983 | ret = hid_add_device(hid); |
| 984 | if (ret) { |
| 985 | pr_err("can't add hid device: %d\n", ret); |
| 986 | hid_destroy_device(hid); |
| 987 | return ret; |
| 988 | } |
| 989 | |
| 990 | hdev->hid = hid; |
| 991 | return 0; |
| 992 | } |
| 993 | |
| 994 | static void acc_hid_delete(struct acc_hid_dev *hid) |
| 995 | { |
| 996 | kfree(hid->report_desc); |
| 997 | kfree(hid); |
| 998 | } |
| 999 | |
| 1000 | static void acc_hid_work(struct work_struct *data) |
| 1001 | { |
| 1002 | struct acc_dev *dev = _acc_dev; |
| 1003 | struct list_head *entry, *temp; |
| 1004 | struct acc_hid_dev *hid; |
| 1005 | struct list_head new_list, dead_list; |
| 1006 | unsigned long flags; |
| 1007 | |
| 1008 | INIT_LIST_HEAD(&new_list); |
| 1009 | |
| 1010 | spin_lock_irqsave(&dev->lock, flags); |
| 1011 | |
| 1012 | /* copy hids that are ready for initialization to new_list */ |
| 1013 | list_for_each_safe(entry, temp, &dev->new_hid_list) { |
| 1014 | hid = list_entry(entry, struct acc_hid_dev, list); |
| 1015 | if (hid->report_desc_offset == hid->report_desc_len) |
| 1016 | list_move(&hid->list, &new_list); |
| 1017 | } |
| 1018 | |
| 1019 | if (list_empty(&dev->dead_hid_list)) { |
| 1020 | INIT_LIST_HEAD(&dead_list); |
| 1021 | } else { |
| 1022 | /* move all of dev->dead_hid_list to dead_list */ |
| 1023 | dead_list.prev = dev->dead_hid_list.prev; |
| 1024 | dead_list.next = dev->dead_hid_list.next; |
| 1025 | dead_list.next->prev = &dead_list; |
| 1026 | dead_list.prev->next = &dead_list; |
| 1027 | INIT_LIST_HEAD(&dev->dead_hid_list); |
| 1028 | } |
| 1029 | |
| 1030 | spin_unlock_irqrestore(&dev->lock, flags); |
| 1031 | |
| 1032 | /* register new HID devices */ |
| 1033 | list_for_each_safe(entry, temp, &new_list) { |
| 1034 | hid = list_entry(entry, struct acc_hid_dev, list); |
| 1035 | if (acc_hid_init(hid)) { |
| 1036 | pr_err("can't add HID device %p\n", hid); |
| 1037 | acc_hid_delete(hid); |
| 1038 | } else { |
| 1039 | spin_lock_irqsave(&dev->lock, flags); |
| 1040 | list_move(&hid->list, &dev->hid_list); |
| 1041 | spin_unlock_irqrestore(&dev->lock, flags); |
| 1042 | } |
| 1043 | } |
| 1044 | |
| 1045 | /* remove dead HID devices */ |
| 1046 | list_for_each_safe(entry, temp, &dead_list) { |
| 1047 | hid = list_entry(entry, struct acc_hid_dev, list); |
| 1048 | list_del(&hid->list); |
| 1049 | if (hid->hid) |
| 1050 | hid_destroy_device(hid->hid); |
| 1051 | acc_hid_delete(hid); |
| 1052 | } |
| 1053 | } |
| 1054 | |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 1055 | static int acc_function_set_alt(struct usb_function *f, |
| 1056 | unsigned intf, unsigned alt) |
| 1057 | { |
| 1058 | struct acc_dev *dev = func_to_dev(f); |
| 1059 | struct usb_composite_dev *cdev = f->config->cdev; |
| 1060 | int ret; |
| 1061 | |
| 1062 | DBG(cdev, "acc_function_set_alt intf: %d alt: %d\n", intf, alt); |
| 1063 | |
| 1064 | ret = config_ep_by_speed(cdev->gadget, f, dev->ep_in); |
| 1065 | if (ret) |
| 1066 | return ret; |
| 1067 | |
| 1068 | ret = usb_ep_enable(dev->ep_in); |
| 1069 | if (ret) |
| 1070 | return ret; |
| 1071 | |
| 1072 | ret = config_ep_by_speed(cdev->gadget, f, dev->ep_out); |
| 1073 | if (ret) |
| 1074 | return ret; |
| 1075 | |
| 1076 | ret = usb_ep_enable(dev->ep_out); |
| 1077 | if (ret) { |
| 1078 | usb_ep_disable(dev->ep_in); |
| 1079 | return ret; |
| 1080 | } |
| 1081 | |
| 1082 | dev->online = 1; |
| 1083 | |
| 1084 | /* readers may be blocked waiting for us to go online */ |
| 1085 | wake_up(&dev->read_wq); |
| 1086 | return 0; |
| 1087 | } |
| 1088 | |
| 1089 | static void acc_function_disable(struct usb_function *f) |
| 1090 | { |
| 1091 | struct acc_dev *dev = func_to_dev(f); |
| 1092 | struct usb_composite_dev *cdev = dev->cdev; |
| 1093 | |
| 1094 | DBG(cdev, "acc_function_disable\n"); |
| 1095 | acc_set_disconnected(dev); |
| 1096 | usb_ep_disable(dev->ep_in); |
| 1097 | usb_ep_disable(dev->ep_out); |
| 1098 | |
| 1099 | /* readers may be blocked waiting for us to go online */ |
| 1100 | wake_up(&dev->read_wq); |
| 1101 | |
| 1102 | VDBG(cdev, "%s disabled\n", dev->function.name); |
| 1103 | } |
| 1104 | |
| 1105 | static int acc_bind_config(struct usb_configuration *c) |
| 1106 | { |
| 1107 | struct acc_dev *dev = _acc_dev; |
| 1108 | int ret; |
| 1109 | |
| 1110 | printk(KERN_INFO "acc_bind_config\n"); |
| 1111 | |
| 1112 | /* allocate a string ID for our interface */ |
| 1113 | if (acc_string_defs[INTERFACE_STRING_INDEX].id == 0) { |
| 1114 | ret = usb_string_id(c->cdev); |
| 1115 | if (ret < 0) |
| 1116 | return ret; |
| 1117 | acc_string_defs[INTERFACE_STRING_INDEX].id = ret; |
| 1118 | acc_interface_desc.iInterface = ret; |
| 1119 | } |
| 1120 | |
| 1121 | dev->cdev = c->cdev; |
| 1122 | dev->function.name = "accessory"; |
| 1123 | dev->function.strings = acc_strings, |
| 1124 | dev->function.descriptors = fs_acc_descs; |
| 1125 | dev->function.hs_descriptors = hs_acc_descs; |
| 1126 | dev->function.bind = acc_function_bind; |
| 1127 | dev->function.unbind = acc_function_unbind; |
| 1128 | dev->function.set_alt = acc_function_set_alt; |
| 1129 | dev->function.disable = acc_function_disable; |
| 1130 | |
| 1131 | return usb_add_function(c, &dev->function); |
| 1132 | } |
| 1133 | |
| 1134 | static int acc_setup(void) |
| 1135 | { |
| 1136 | struct acc_dev *dev; |
| 1137 | int ret; |
| 1138 | |
| 1139 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| 1140 | if (!dev) |
| 1141 | return -ENOMEM; |
| 1142 | |
| 1143 | spin_lock_init(&dev->lock); |
| 1144 | init_waitqueue_head(&dev->read_wq); |
| 1145 | init_waitqueue_head(&dev->write_wq); |
| 1146 | atomic_set(&dev->open_excl, 0); |
| 1147 | INIT_LIST_HEAD(&dev->tx_idle); |
Mike Lockwood | 205115d | 2012-03-26 11:03:55 -0700 | [diff] [blame^] | 1148 | INIT_LIST_HEAD(&dev->hid_list); |
| 1149 | INIT_LIST_HEAD(&dev->new_hid_list); |
| 1150 | INIT_LIST_HEAD(&dev->dead_hid_list); |
| 1151 | INIT_DELAYED_WORK(&dev->start_work, acc_start_work); |
| 1152 | INIT_WORK(&dev->hid_work, acc_hid_work); |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 1153 | |
| 1154 | /* _acc_dev must be set before calling usb_gadget_register_driver */ |
| 1155 | _acc_dev = dev; |
| 1156 | |
| 1157 | ret = misc_register(&acc_device); |
| 1158 | if (ret) |
| 1159 | goto err; |
| 1160 | |
| 1161 | return 0; |
| 1162 | |
| 1163 | err: |
| 1164 | kfree(dev); |
Mike Lockwood | 205115d | 2012-03-26 11:03:55 -0700 | [diff] [blame^] | 1165 | pr_err("USB accessory gadget driver failed to initialize\n"); |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 1166 | return ret; |
| 1167 | } |
| 1168 | |
Mike Lockwood | 205115d | 2012-03-26 11:03:55 -0700 | [diff] [blame^] | 1169 | static void acc_disconnect(void) |
| 1170 | { |
| 1171 | /* unregister all HID devices if USB is disconnected */ |
| 1172 | kill_all_hid_devices(_acc_dev); |
| 1173 | } |
| 1174 | |
Benoit Goby | 3d95527 | 2011-12-19 14:39:37 -0800 | [diff] [blame] | 1175 | static void acc_cleanup(void) |
| 1176 | { |
| 1177 | misc_deregister(&acc_device); |
| 1178 | kfree(_acc_dev); |
| 1179 | _acc_dev = NULL; |
| 1180 | } |