Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Gadget Function Driver for MTP |
| 3 | * |
| 4 | * Copyright (C) 2010 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 | |
| 29 | #include <linux/types.h> |
| 30 | #include <linux/file.h> |
| 31 | #include <linux/device.h> |
| 32 | #include <linux/miscdevice.h> |
| 33 | |
| 34 | #include <linux/usb.h> |
| 35 | #include <linux/usb_usual.h> |
| 36 | #include <linux/usb/ch9.h> |
| 37 | #include <linux/usb/f_mtp.h> |
Badhri Jagan Sridharan | eab46c4 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 38 | #include <linux/configfs.h> |
| 39 | #include <linux/usb/composite.h> |
| 40 | |
| 41 | #include "configfs.h" |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 42 | |
| 43 | #define MTP_BULK_BUFFER_SIZE 16384 |
| 44 | #define INTR_BUFFER_SIZE 28 |
Badhri Jagan Sridharan | eab46c4 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 45 | #define MAX_INST_NAME_LEN 40 |
Witold Sciuk | 6db5c3e | 2016-02-13 11:08:37 +0100 | [diff] [blame] | 46 | #define MTP_MAX_FILE_SIZE 0xFFFFFFFFL |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 47 | |
| 48 | /* String IDs */ |
| 49 | #define INTERFACE_STRING_INDEX 0 |
| 50 | |
| 51 | /* values for mtp_dev.state */ |
| 52 | #define STATE_OFFLINE 0 /* initial state, disconnected */ |
| 53 | #define STATE_READY 1 /* ready for userspace calls */ |
| 54 | #define STATE_BUSY 2 /* processing userspace calls */ |
| 55 | #define STATE_CANCELED 3 /* transaction canceled by host */ |
| 56 | #define STATE_ERROR 4 /* error from completion routine */ |
| 57 | |
| 58 | /* number of tx and rx requests to allocate */ |
| 59 | #define TX_REQ_MAX 4 |
| 60 | #define RX_REQ_MAX 2 |
| 61 | #define INTR_REQ_MAX 5 |
| 62 | |
| 63 | /* ID for Microsoft MTP OS String */ |
| 64 | #define MTP_OS_STRING_ID 0xEE |
| 65 | |
| 66 | /* MTP class reqeusts */ |
| 67 | #define MTP_REQ_CANCEL 0x64 |
| 68 | #define MTP_REQ_GET_EXT_EVENT_DATA 0x65 |
| 69 | #define MTP_REQ_RESET 0x66 |
| 70 | #define MTP_REQ_GET_DEVICE_STATUS 0x67 |
| 71 | |
| 72 | /* constants for device status */ |
| 73 | #define MTP_RESPONSE_OK 0x2001 |
| 74 | #define MTP_RESPONSE_DEVICE_BUSY 0x2019 |
Badhri Jagan Sridharan | eab46c4 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 75 | #define DRIVER_NAME "mtp" |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 76 | |
Badhri Jagan Sridharan | eab46c4 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 77 | static const char mtp_shortname[] = DRIVER_NAME "_usb"; |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 78 | |
| 79 | struct mtp_dev { |
| 80 | struct usb_function function; |
| 81 | struct usb_composite_dev *cdev; |
| 82 | spinlock_t lock; |
| 83 | |
| 84 | struct usb_ep *ep_in; |
| 85 | struct usb_ep *ep_out; |
| 86 | struct usb_ep *ep_intr; |
| 87 | |
| 88 | int state; |
| 89 | |
| 90 | /* synchronize access to our device file */ |
| 91 | atomic_t open_excl; |
| 92 | /* to enforce only one ioctl at a time */ |
| 93 | atomic_t ioctl_excl; |
| 94 | |
| 95 | struct list_head tx_idle; |
| 96 | struct list_head intr_idle; |
| 97 | |
| 98 | wait_queue_head_t read_wq; |
| 99 | wait_queue_head_t write_wq; |
| 100 | wait_queue_head_t intr_wq; |
| 101 | struct usb_request *rx_req[RX_REQ_MAX]; |
| 102 | int rx_done; |
| 103 | |
| 104 | /* for processing MTP_SEND_FILE, MTP_RECEIVE_FILE and |
| 105 | * MTP_SEND_FILE_WITH_HEADER ioctls on a work queue |
| 106 | */ |
| 107 | struct workqueue_struct *wq; |
| 108 | struct work_struct send_file_work; |
| 109 | struct work_struct receive_file_work; |
| 110 | struct file *xfer_file; |
| 111 | loff_t xfer_file_offset; |
| 112 | int64_t xfer_file_length; |
| 113 | unsigned xfer_send_header; |
| 114 | uint16_t xfer_command; |
| 115 | uint32_t xfer_transaction_id; |
| 116 | int xfer_result; |
| 117 | }; |
| 118 | |
| 119 | static struct usb_interface_descriptor mtp_interface_desc = { |
| 120 | .bLength = USB_DT_INTERFACE_SIZE, |
| 121 | .bDescriptorType = USB_DT_INTERFACE, |
| 122 | .bInterfaceNumber = 0, |
| 123 | .bNumEndpoints = 3, |
| 124 | .bInterfaceClass = USB_CLASS_VENDOR_SPEC, |
| 125 | .bInterfaceSubClass = USB_SUBCLASS_VENDOR_SPEC, |
| 126 | .bInterfaceProtocol = 0, |
| 127 | }; |
| 128 | |
| 129 | static struct usb_interface_descriptor ptp_interface_desc = { |
| 130 | .bLength = USB_DT_INTERFACE_SIZE, |
| 131 | .bDescriptorType = USB_DT_INTERFACE, |
| 132 | .bInterfaceNumber = 0, |
| 133 | .bNumEndpoints = 3, |
| 134 | .bInterfaceClass = USB_CLASS_STILL_IMAGE, |
| 135 | .bInterfaceSubClass = 1, |
| 136 | .bInterfaceProtocol = 1, |
| 137 | }; |
| 138 | |
Mark Kuo | b115a6f | 2015-08-20 13:01:46 +0800 | [diff] [blame] | 139 | static struct usb_endpoint_descriptor mtp_ss_in_desc = { |
| 140 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 141 | .bDescriptorType = USB_DT_ENDPOINT, |
| 142 | .bEndpointAddress = USB_DIR_IN, |
| 143 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 144 | .wMaxPacketSize = __constant_cpu_to_le16(1024), |
| 145 | }; |
| 146 | |
| 147 | static struct usb_ss_ep_comp_descriptor mtp_ss_in_comp_desc = { |
| 148 | .bLength = sizeof(mtp_ss_in_comp_desc), |
| 149 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, |
| 150 | /* .bMaxBurst = DYNAMIC, */ |
| 151 | }; |
| 152 | |
| 153 | static struct usb_endpoint_descriptor mtp_ss_out_desc = { |
| 154 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 155 | .bDescriptorType = USB_DT_ENDPOINT, |
| 156 | .bEndpointAddress = USB_DIR_OUT, |
| 157 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 158 | .wMaxPacketSize = __constant_cpu_to_le16(1024), |
| 159 | }; |
| 160 | |
| 161 | static struct usb_ss_ep_comp_descriptor mtp_ss_out_comp_desc = { |
| 162 | .bLength = sizeof(mtp_ss_out_comp_desc), |
| 163 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, |
| 164 | /* .bMaxBurst = DYNAMIC, */ |
| 165 | }; |
| 166 | |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 167 | static struct usb_endpoint_descriptor mtp_highspeed_in_desc = { |
| 168 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 169 | .bDescriptorType = USB_DT_ENDPOINT, |
| 170 | .bEndpointAddress = USB_DIR_IN, |
| 171 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 172 | .wMaxPacketSize = __constant_cpu_to_le16(512), |
| 173 | }; |
| 174 | |
| 175 | static struct usb_endpoint_descriptor mtp_highspeed_out_desc = { |
| 176 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 177 | .bDescriptorType = USB_DT_ENDPOINT, |
| 178 | .bEndpointAddress = USB_DIR_OUT, |
| 179 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 180 | .wMaxPacketSize = __constant_cpu_to_le16(512), |
| 181 | }; |
| 182 | |
| 183 | static struct usb_endpoint_descriptor mtp_fullspeed_in_desc = { |
| 184 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 185 | .bDescriptorType = USB_DT_ENDPOINT, |
| 186 | .bEndpointAddress = USB_DIR_IN, |
| 187 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 188 | }; |
| 189 | |
| 190 | static struct usb_endpoint_descriptor mtp_fullspeed_out_desc = { |
| 191 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 192 | .bDescriptorType = USB_DT_ENDPOINT, |
| 193 | .bEndpointAddress = USB_DIR_OUT, |
| 194 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 195 | }; |
| 196 | |
| 197 | static struct usb_endpoint_descriptor mtp_intr_desc = { |
| 198 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 199 | .bDescriptorType = USB_DT_ENDPOINT, |
| 200 | .bEndpointAddress = USB_DIR_IN, |
| 201 | .bmAttributes = USB_ENDPOINT_XFER_INT, |
| 202 | .wMaxPacketSize = __constant_cpu_to_le16(INTR_BUFFER_SIZE), |
| 203 | .bInterval = 6, |
| 204 | }; |
| 205 | |
Mark Kuo | b115a6f | 2015-08-20 13:01:46 +0800 | [diff] [blame] | 206 | static struct usb_ss_ep_comp_descriptor mtp_intr_ss_comp_desc = { |
| 207 | .bLength = sizeof(mtp_intr_ss_comp_desc), |
| 208 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, |
Mark Kuo | 09cd36b | 2015-09-11 16:12:59 +0800 | [diff] [blame] | 209 | .wBytesPerInterval = cpu_to_le16(INTR_BUFFER_SIZE), |
Mark Kuo | b115a6f | 2015-08-20 13:01:46 +0800 | [diff] [blame] | 210 | }; |
| 211 | |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 212 | static struct usb_descriptor_header *fs_mtp_descs[] = { |
| 213 | (struct usb_descriptor_header *) &mtp_interface_desc, |
| 214 | (struct usb_descriptor_header *) &mtp_fullspeed_in_desc, |
| 215 | (struct usb_descriptor_header *) &mtp_fullspeed_out_desc, |
| 216 | (struct usb_descriptor_header *) &mtp_intr_desc, |
| 217 | NULL, |
| 218 | }; |
| 219 | |
| 220 | static struct usb_descriptor_header *hs_mtp_descs[] = { |
| 221 | (struct usb_descriptor_header *) &mtp_interface_desc, |
| 222 | (struct usb_descriptor_header *) &mtp_highspeed_in_desc, |
| 223 | (struct usb_descriptor_header *) &mtp_highspeed_out_desc, |
| 224 | (struct usb_descriptor_header *) &mtp_intr_desc, |
| 225 | NULL, |
| 226 | }; |
| 227 | |
Mark Kuo | b115a6f | 2015-08-20 13:01:46 +0800 | [diff] [blame] | 228 | static struct usb_descriptor_header *ss_mtp_descs[] = { |
| 229 | (struct usb_descriptor_header *) &mtp_interface_desc, |
| 230 | (struct usb_descriptor_header *) &mtp_ss_in_desc, |
| 231 | (struct usb_descriptor_header *) &mtp_ss_in_comp_desc, |
| 232 | (struct usb_descriptor_header *) &mtp_ss_out_desc, |
| 233 | (struct usb_descriptor_header *) &mtp_ss_out_comp_desc, |
| 234 | (struct usb_descriptor_header *) &mtp_intr_desc, |
| 235 | (struct usb_descriptor_header *) &mtp_intr_ss_comp_desc, |
| 236 | NULL, |
| 237 | }; |
| 238 | |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 239 | static struct usb_descriptor_header *fs_ptp_descs[] = { |
| 240 | (struct usb_descriptor_header *) &ptp_interface_desc, |
| 241 | (struct usb_descriptor_header *) &mtp_fullspeed_in_desc, |
| 242 | (struct usb_descriptor_header *) &mtp_fullspeed_out_desc, |
| 243 | (struct usb_descriptor_header *) &mtp_intr_desc, |
| 244 | NULL, |
| 245 | }; |
| 246 | |
| 247 | static struct usb_descriptor_header *hs_ptp_descs[] = { |
| 248 | (struct usb_descriptor_header *) &ptp_interface_desc, |
| 249 | (struct usb_descriptor_header *) &mtp_highspeed_in_desc, |
| 250 | (struct usb_descriptor_header *) &mtp_highspeed_out_desc, |
| 251 | (struct usb_descriptor_header *) &mtp_intr_desc, |
| 252 | NULL, |
| 253 | }; |
| 254 | |
Mark Kuo | b115a6f | 2015-08-20 13:01:46 +0800 | [diff] [blame] | 255 | static struct usb_descriptor_header *ss_ptp_descs[] = { |
| 256 | (struct usb_descriptor_header *) &ptp_interface_desc, |
| 257 | (struct usb_descriptor_header *) &mtp_ss_in_desc, |
| 258 | (struct usb_descriptor_header *) &mtp_ss_in_comp_desc, |
| 259 | (struct usb_descriptor_header *) &mtp_ss_out_desc, |
| 260 | (struct usb_descriptor_header *) &mtp_ss_out_comp_desc, |
| 261 | (struct usb_descriptor_header *) &mtp_intr_desc, |
| 262 | (struct usb_descriptor_header *) &mtp_intr_ss_comp_desc, |
| 263 | NULL, |
| 264 | }; |
| 265 | |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 266 | static struct usb_string mtp_string_defs[] = { |
| 267 | /* Naming interface "MTP" so libmtp will recognize us */ |
| 268 | [INTERFACE_STRING_INDEX].s = "MTP", |
| 269 | { }, /* end of list */ |
| 270 | }; |
| 271 | |
| 272 | static struct usb_gadget_strings mtp_string_table = { |
| 273 | .language = 0x0409, /* en-US */ |
| 274 | .strings = mtp_string_defs, |
| 275 | }; |
| 276 | |
| 277 | static struct usb_gadget_strings *mtp_strings[] = { |
| 278 | &mtp_string_table, |
| 279 | NULL, |
| 280 | }; |
| 281 | |
| 282 | /* Microsoft MTP OS String */ |
| 283 | static u8 mtp_os_string[] = { |
| 284 | 18, /* sizeof(mtp_os_string) */ |
| 285 | USB_DT_STRING, |
| 286 | /* Signature field: "MSFT100" */ |
| 287 | 'M', 0, 'S', 0, 'F', 0, 'T', 0, '1', 0, '0', 0, '0', 0, |
| 288 | /* vendor code */ |
| 289 | 1, |
| 290 | /* padding */ |
| 291 | 0 |
| 292 | }; |
| 293 | |
| 294 | /* Microsoft Extended Configuration Descriptor Header Section */ |
| 295 | struct mtp_ext_config_desc_header { |
| 296 | __le32 dwLength; |
| 297 | __u16 bcdVersion; |
| 298 | __le16 wIndex; |
| 299 | __u8 bCount; |
| 300 | __u8 reserved[7]; |
| 301 | }; |
| 302 | |
| 303 | /* Microsoft Extended Configuration Descriptor Function Section */ |
| 304 | struct mtp_ext_config_desc_function { |
| 305 | __u8 bFirstInterfaceNumber; |
| 306 | __u8 bInterfaceCount; |
| 307 | __u8 compatibleID[8]; |
| 308 | __u8 subCompatibleID[8]; |
| 309 | __u8 reserved[6]; |
| 310 | }; |
| 311 | |
| 312 | /* MTP Extended Configuration Descriptor */ |
| 313 | struct { |
| 314 | struct mtp_ext_config_desc_header header; |
| 315 | struct mtp_ext_config_desc_function function; |
| 316 | } mtp_ext_config_desc = { |
| 317 | .header = { |
| 318 | .dwLength = __constant_cpu_to_le32(sizeof(mtp_ext_config_desc)), |
| 319 | .bcdVersion = __constant_cpu_to_le16(0x0100), |
| 320 | .wIndex = __constant_cpu_to_le16(4), |
Brian Norris | 557d80f | 2016-02-29 17:44:51 -0800 | [diff] [blame] | 321 | .bCount = 1, |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 322 | }, |
| 323 | .function = { |
| 324 | .bFirstInterfaceNumber = 0, |
| 325 | .bInterfaceCount = 1, |
| 326 | .compatibleID = { 'M', 'T', 'P' }, |
| 327 | }, |
| 328 | }; |
| 329 | |
| 330 | struct mtp_device_status { |
| 331 | __le16 wLength; |
| 332 | __le16 wCode; |
| 333 | }; |
| 334 | |
Colin Cross | 2453dad | 2013-11-07 13:08:15 -0800 | [diff] [blame] | 335 | struct mtp_data_header { |
| 336 | /* length of packet, including this header */ |
| 337 | __le32 length; |
| 338 | /* container type (2 for data packet) */ |
| 339 | __le16 type; |
| 340 | /* MTP command code */ |
| 341 | __le16 command; |
| 342 | /* MTP transaction ID */ |
| 343 | __le32 transaction_id; |
| 344 | }; |
| 345 | |
Badhri Jagan Sridharan | eab46c4 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 346 | struct mtp_instance { |
| 347 | struct usb_function_instance func_inst; |
| 348 | const char *name; |
| 349 | struct mtp_dev *dev; |
Badhri Jagan Sridharan | 38333b0 | 2015-10-06 20:32:01 -0700 | [diff] [blame] | 350 | char mtp_ext_compat_id[16]; |
| 351 | struct usb_os_desc mtp_os_desc; |
Badhri Jagan Sridharan | eab46c4 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 352 | }; |
| 353 | |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 354 | /* temporary variable used between mtp_open() and mtp_gadget_bind() */ |
| 355 | static struct mtp_dev *_mtp_dev; |
| 356 | |
| 357 | static inline struct mtp_dev *func_to_mtp(struct usb_function *f) |
| 358 | { |
| 359 | return container_of(f, struct mtp_dev, function); |
| 360 | } |
| 361 | |
| 362 | static struct usb_request *mtp_request_new(struct usb_ep *ep, int buffer_size) |
| 363 | { |
| 364 | struct usb_request *req = usb_ep_alloc_request(ep, GFP_KERNEL); |
Anson Jacob | 051584e | 2016-11-11 01:10:04 -0500 | [diff] [blame] | 365 | |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 366 | if (!req) |
| 367 | return NULL; |
| 368 | |
| 369 | /* now allocate buffers for the requests */ |
| 370 | req->buf = kmalloc(buffer_size, GFP_KERNEL); |
| 371 | if (!req->buf) { |
| 372 | usb_ep_free_request(ep, req); |
| 373 | return NULL; |
| 374 | } |
| 375 | |
| 376 | return req; |
| 377 | } |
| 378 | |
| 379 | static void mtp_request_free(struct usb_request *req, struct usb_ep *ep) |
| 380 | { |
| 381 | if (req) { |
| 382 | kfree(req->buf); |
| 383 | usb_ep_free_request(ep, req); |
| 384 | } |
| 385 | } |
| 386 | |
| 387 | static inline int mtp_lock(atomic_t *excl) |
| 388 | { |
| 389 | if (atomic_inc_return(excl) == 1) { |
| 390 | return 0; |
| 391 | } else { |
| 392 | atomic_dec(excl); |
| 393 | return -1; |
| 394 | } |
| 395 | } |
| 396 | |
| 397 | static inline void mtp_unlock(atomic_t *excl) |
| 398 | { |
| 399 | atomic_dec(excl); |
| 400 | } |
| 401 | |
| 402 | /* add a request to the tail of a list */ |
| 403 | static void mtp_req_put(struct mtp_dev *dev, struct list_head *head, |
| 404 | struct usb_request *req) |
| 405 | { |
| 406 | unsigned long flags; |
| 407 | |
| 408 | spin_lock_irqsave(&dev->lock, flags); |
| 409 | list_add_tail(&req->list, head); |
| 410 | spin_unlock_irqrestore(&dev->lock, flags); |
| 411 | } |
| 412 | |
| 413 | /* remove a request from the head of a list */ |
| 414 | static struct usb_request |
| 415 | *mtp_req_get(struct mtp_dev *dev, struct list_head *head) |
| 416 | { |
| 417 | unsigned long flags; |
| 418 | struct usb_request *req; |
| 419 | |
| 420 | spin_lock_irqsave(&dev->lock, flags); |
| 421 | if (list_empty(head)) { |
| 422 | req = 0; |
| 423 | } else { |
| 424 | req = list_first_entry(head, struct usb_request, list); |
| 425 | list_del(&req->list); |
| 426 | } |
| 427 | spin_unlock_irqrestore(&dev->lock, flags); |
| 428 | return req; |
| 429 | } |
| 430 | |
| 431 | static void mtp_complete_in(struct usb_ep *ep, struct usb_request *req) |
| 432 | { |
| 433 | struct mtp_dev *dev = _mtp_dev; |
| 434 | |
| 435 | if (req->status != 0) |
| 436 | dev->state = STATE_ERROR; |
| 437 | |
| 438 | mtp_req_put(dev, &dev->tx_idle, req); |
| 439 | |
| 440 | wake_up(&dev->write_wq); |
| 441 | } |
| 442 | |
| 443 | static void mtp_complete_out(struct usb_ep *ep, struct usb_request *req) |
| 444 | { |
| 445 | struct mtp_dev *dev = _mtp_dev; |
| 446 | |
| 447 | dev->rx_done = 1; |
| 448 | if (req->status != 0) |
| 449 | dev->state = STATE_ERROR; |
| 450 | |
| 451 | wake_up(&dev->read_wq); |
| 452 | } |
| 453 | |
| 454 | static void mtp_complete_intr(struct usb_ep *ep, struct usb_request *req) |
| 455 | { |
| 456 | struct mtp_dev *dev = _mtp_dev; |
| 457 | |
| 458 | if (req->status != 0) |
| 459 | dev->state = STATE_ERROR; |
| 460 | |
| 461 | mtp_req_put(dev, &dev->intr_idle, req); |
| 462 | |
| 463 | wake_up(&dev->intr_wq); |
| 464 | } |
| 465 | |
| 466 | static int mtp_create_bulk_endpoints(struct mtp_dev *dev, |
| 467 | struct usb_endpoint_descriptor *in_desc, |
| 468 | struct usb_endpoint_descriptor *out_desc, |
| 469 | struct usb_endpoint_descriptor *intr_desc) |
| 470 | { |
| 471 | struct usb_composite_dev *cdev = dev->cdev; |
| 472 | struct usb_request *req; |
| 473 | struct usb_ep *ep; |
| 474 | int i; |
| 475 | |
| 476 | DBG(cdev, "create_bulk_endpoints dev: %p\n", dev); |
| 477 | |
| 478 | ep = usb_ep_autoconfig(cdev->gadget, in_desc); |
| 479 | if (!ep) { |
| 480 | DBG(cdev, "usb_ep_autoconfig for ep_in failed\n"); |
| 481 | return -ENODEV; |
| 482 | } |
| 483 | DBG(cdev, "usb_ep_autoconfig for ep_in got %s\n", ep->name); |
| 484 | ep->driver_data = dev; /* claim the endpoint */ |
| 485 | dev->ep_in = ep; |
| 486 | |
| 487 | ep = usb_ep_autoconfig(cdev->gadget, out_desc); |
| 488 | if (!ep) { |
| 489 | DBG(cdev, "usb_ep_autoconfig for ep_out failed\n"); |
| 490 | return -ENODEV; |
| 491 | } |
| 492 | DBG(cdev, "usb_ep_autoconfig for mtp ep_out got %s\n", ep->name); |
| 493 | ep->driver_data = dev; /* claim the endpoint */ |
| 494 | dev->ep_out = ep; |
| 495 | |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 496 | ep = usb_ep_autoconfig(cdev->gadget, intr_desc); |
| 497 | if (!ep) { |
| 498 | DBG(cdev, "usb_ep_autoconfig for ep_intr failed\n"); |
| 499 | return -ENODEV; |
| 500 | } |
| 501 | DBG(cdev, "usb_ep_autoconfig for mtp ep_intr got %s\n", ep->name); |
| 502 | ep->driver_data = dev; /* claim the endpoint */ |
| 503 | dev->ep_intr = ep; |
| 504 | |
| 505 | /* now allocate requests for our endpoints */ |
| 506 | for (i = 0; i < TX_REQ_MAX; i++) { |
| 507 | req = mtp_request_new(dev->ep_in, MTP_BULK_BUFFER_SIZE); |
| 508 | if (!req) |
| 509 | goto fail; |
| 510 | req->complete = mtp_complete_in; |
| 511 | mtp_req_put(dev, &dev->tx_idle, req); |
| 512 | } |
| 513 | for (i = 0; i < RX_REQ_MAX; i++) { |
| 514 | req = mtp_request_new(dev->ep_out, MTP_BULK_BUFFER_SIZE); |
| 515 | if (!req) |
| 516 | goto fail; |
| 517 | req->complete = mtp_complete_out; |
| 518 | dev->rx_req[i] = req; |
| 519 | } |
| 520 | for (i = 0; i < INTR_REQ_MAX; i++) { |
| 521 | req = mtp_request_new(dev->ep_intr, INTR_BUFFER_SIZE); |
| 522 | if (!req) |
| 523 | goto fail; |
| 524 | req->complete = mtp_complete_intr; |
| 525 | mtp_req_put(dev, &dev->intr_idle, req); |
| 526 | } |
| 527 | |
| 528 | return 0; |
| 529 | |
| 530 | fail: |
Badhri Jagan Sridharan | eab46c4 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 531 | pr_err("mtp_bind() could not allocate requests\n"); |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 532 | return -1; |
| 533 | } |
| 534 | |
| 535 | static ssize_t mtp_read(struct file *fp, char __user *buf, |
| 536 | size_t count, loff_t *pos) |
| 537 | { |
| 538 | struct mtp_dev *dev = fp->private_data; |
| 539 | struct usb_composite_dev *cdev = dev->cdev; |
| 540 | struct usb_request *req; |
Greg Hackmann | 1b07ec7 | 2014-02-24 10:19:13 -0800 | [diff] [blame] | 541 | ssize_t r = count; |
| 542 | unsigned xfer; |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 543 | int ret = 0; |
Jiebing Li | 3bbd898 | 2015-03-10 11:25:50 +0800 | [diff] [blame] | 544 | size_t len = 0; |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 545 | |
Greg Hackmann | 1b07ec7 | 2014-02-24 10:19:13 -0800 | [diff] [blame] | 546 | DBG(cdev, "mtp_read(%zu)\n", count); |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 547 | |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 548 | /* we will block until we're online */ |
| 549 | DBG(cdev, "mtp_read: waiting for online state\n"); |
| 550 | ret = wait_event_interruptible(dev->read_wq, |
| 551 | dev->state != STATE_OFFLINE); |
| 552 | if (ret < 0) { |
| 553 | r = ret; |
| 554 | goto done; |
| 555 | } |
| 556 | spin_lock_irq(&dev->lock); |
Jiebing Li | 3bbd898 | 2015-03-10 11:25:50 +0800 | [diff] [blame] | 557 | if (dev->ep_out->desc) { |
| 558 | len = usb_ep_align_maybe(cdev->gadget, dev->ep_out, count); |
| 559 | if (len > MTP_BULK_BUFFER_SIZE) { |
| 560 | spin_unlock_irq(&dev->lock); |
| 561 | return -EINVAL; |
| 562 | } |
| 563 | } |
| 564 | |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 565 | if (dev->state == STATE_CANCELED) { |
| 566 | /* report cancelation to userspace */ |
| 567 | dev->state = STATE_READY; |
| 568 | spin_unlock_irq(&dev->lock); |
| 569 | return -ECANCELED; |
| 570 | } |
| 571 | dev->state = STATE_BUSY; |
| 572 | spin_unlock_irq(&dev->lock); |
| 573 | |
| 574 | requeue_req: |
| 575 | /* queue a request */ |
| 576 | req = dev->rx_req[0]; |
Jiebing Li | 6b4bbab | 2015-03-10 11:24:00 +0800 | [diff] [blame] | 577 | req->length = len; |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 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 | DBG(cdev, "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->state == STATE_BUSY) { |
| 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 | DBG(cdev, "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 | spin_lock_irq(&dev->lock); |
| 609 | if (dev->state == STATE_CANCELED) |
| 610 | r = -ECANCELED; |
| 611 | else if (dev->state != STATE_OFFLINE) |
| 612 | dev->state = STATE_READY; |
| 613 | spin_unlock_irq(&dev->lock); |
| 614 | |
Greg Hackmann | 1b07ec7 | 2014-02-24 10:19:13 -0800 | [diff] [blame] | 615 | DBG(cdev, "mtp_read returning %zd\n", r); |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 616 | return r; |
| 617 | } |
| 618 | |
| 619 | static ssize_t mtp_write(struct file *fp, const char __user *buf, |
| 620 | size_t count, loff_t *pos) |
| 621 | { |
| 622 | struct mtp_dev *dev = fp->private_data; |
| 623 | struct usb_composite_dev *cdev = dev->cdev; |
| 624 | struct usb_request *req = 0; |
Greg Hackmann | 1b07ec7 | 2014-02-24 10:19:13 -0800 | [diff] [blame] | 625 | ssize_t r = count; |
| 626 | unsigned xfer; |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 627 | int sendZLP = 0; |
| 628 | int ret; |
| 629 | |
Greg Hackmann | 1b07ec7 | 2014-02-24 10:19:13 -0800 | [diff] [blame] | 630 | DBG(cdev, "mtp_write(%zu)\n", count); |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 631 | |
| 632 | spin_lock_irq(&dev->lock); |
| 633 | if (dev->state == STATE_CANCELED) { |
| 634 | /* report cancelation to userspace */ |
| 635 | dev->state = STATE_READY; |
| 636 | spin_unlock_irq(&dev->lock); |
| 637 | return -ECANCELED; |
| 638 | } |
| 639 | if (dev->state == STATE_OFFLINE) { |
| 640 | spin_unlock_irq(&dev->lock); |
| 641 | return -ENODEV; |
| 642 | } |
| 643 | dev->state = STATE_BUSY; |
| 644 | spin_unlock_irq(&dev->lock); |
| 645 | |
| 646 | /* we need to send a zero length packet to signal the end of transfer |
| 647 | * if the transfer size is aligned to a packet boundary. |
| 648 | */ |
| 649 | if ((count & (dev->ep_in->maxpacket - 1)) == 0) |
| 650 | sendZLP = 1; |
| 651 | |
| 652 | while (count > 0 || sendZLP) { |
| 653 | /* so we exit after sending ZLP */ |
| 654 | if (count == 0) |
| 655 | sendZLP = 0; |
| 656 | |
| 657 | if (dev->state != STATE_BUSY) { |
| 658 | DBG(cdev, "mtp_write dev->error\n"); |
| 659 | r = -EIO; |
| 660 | break; |
| 661 | } |
| 662 | |
| 663 | /* get an idle tx request to use */ |
| 664 | req = 0; |
| 665 | ret = wait_event_interruptible(dev->write_wq, |
| 666 | ((req = mtp_req_get(dev, &dev->tx_idle)) |
| 667 | || dev->state != STATE_BUSY)); |
| 668 | if (!req) { |
| 669 | r = ret; |
| 670 | break; |
| 671 | } |
| 672 | |
| 673 | if (count > MTP_BULK_BUFFER_SIZE) |
| 674 | xfer = MTP_BULK_BUFFER_SIZE; |
| 675 | else |
| 676 | xfer = count; |
| 677 | if (xfer && copy_from_user(req->buf, buf, xfer)) { |
| 678 | r = -EFAULT; |
| 679 | break; |
| 680 | } |
| 681 | |
| 682 | req->length = xfer; |
| 683 | ret = usb_ep_queue(dev->ep_in, req, GFP_KERNEL); |
| 684 | if (ret < 0) { |
| 685 | DBG(cdev, "mtp_write: xfer error %d\n", ret); |
| 686 | r = -EIO; |
| 687 | break; |
| 688 | } |
| 689 | |
| 690 | buf += xfer; |
| 691 | count -= xfer; |
| 692 | |
| 693 | /* zero this so we don't try to free it on error exit */ |
| 694 | req = 0; |
| 695 | } |
| 696 | |
| 697 | if (req) |
| 698 | mtp_req_put(dev, &dev->tx_idle, req); |
| 699 | |
| 700 | spin_lock_irq(&dev->lock); |
| 701 | if (dev->state == STATE_CANCELED) |
| 702 | r = -ECANCELED; |
| 703 | else if (dev->state != STATE_OFFLINE) |
| 704 | dev->state = STATE_READY; |
| 705 | spin_unlock_irq(&dev->lock); |
| 706 | |
Greg Hackmann | 1b07ec7 | 2014-02-24 10:19:13 -0800 | [diff] [blame] | 707 | DBG(cdev, "mtp_write returning %zd\n", r); |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 708 | return r; |
| 709 | } |
| 710 | |
| 711 | /* read from a local file and write to USB */ |
| 712 | static void send_file_work(struct work_struct *data) |
| 713 | { |
| 714 | struct mtp_dev *dev = container_of(data, struct mtp_dev, |
| 715 | send_file_work); |
| 716 | struct usb_composite_dev *cdev = dev->cdev; |
| 717 | struct usb_request *req = 0; |
| 718 | struct mtp_data_header *header; |
| 719 | struct file *filp; |
| 720 | loff_t offset; |
| 721 | int64_t count; |
| 722 | int xfer, ret, hdr_size; |
| 723 | int r = 0; |
| 724 | int sendZLP = 0; |
| 725 | |
| 726 | /* read our parameters */ |
| 727 | smp_rmb(); |
| 728 | filp = dev->xfer_file; |
| 729 | offset = dev->xfer_file_offset; |
| 730 | count = dev->xfer_file_length; |
| 731 | |
| 732 | DBG(cdev, "send_file_work(%lld %lld)\n", offset, count); |
| 733 | |
| 734 | if (dev->xfer_send_header) { |
| 735 | hdr_size = sizeof(struct mtp_data_header); |
| 736 | count += hdr_size; |
| 737 | } else { |
| 738 | hdr_size = 0; |
| 739 | } |
| 740 | |
| 741 | /* we need to send a zero length packet to signal the end of transfer |
| 742 | * if the transfer size is aligned to a packet boundary. |
| 743 | */ |
| 744 | if ((count & (dev->ep_in->maxpacket - 1)) == 0) |
| 745 | sendZLP = 1; |
| 746 | |
| 747 | while (count > 0 || sendZLP) { |
| 748 | /* so we exit after sending ZLP */ |
| 749 | if (count == 0) |
| 750 | sendZLP = 0; |
| 751 | |
| 752 | /* get an idle tx request to use */ |
| 753 | req = 0; |
| 754 | ret = wait_event_interruptible(dev->write_wq, |
| 755 | (req = mtp_req_get(dev, &dev->tx_idle)) |
| 756 | || dev->state != STATE_BUSY); |
| 757 | if (dev->state == STATE_CANCELED) { |
| 758 | r = -ECANCELED; |
| 759 | break; |
| 760 | } |
| 761 | if (!req) { |
| 762 | r = ret; |
| 763 | break; |
| 764 | } |
| 765 | |
| 766 | if (count > MTP_BULK_BUFFER_SIZE) |
| 767 | xfer = MTP_BULK_BUFFER_SIZE; |
| 768 | else |
| 769 | xfer = count; |
| 770 | |
| 771 | if (hdr_size) { |
| 772 | /* prepend MTP data header */ |
| 773 | header = (struct mtp_data_header *)req->buf; |
Witold Sciuk | 6db5c3e | 2016-02-13 11:08:37 +0100 | [diff] [blame] | 774 | /* |
| 775 | * set file size with header according to |
| 776 | * MTP Specification v1.0 |
| 777 | */ |
| 778 | header->length = (count > MTP_MAX_FILE_SIZE) ? |
| 779 | MTP_MAX_FILE_SIZE : __cpu_to_le32(count); |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 780 | header->type = __cpu_to_le16(2); /* data packet */ |
| 781 | header->command = __cpu_to_le16(dev->xfer_command); |
| 782 | header->transaction_id = |
| 783 | __cpu_to_le32(dev->xfer_transaction_id); |
| 784 | } |
| 785 | |
| 786 | ret = vfs_read(filp, req->buf + hdr_size, xfer - hdr_size, |
| 787 | &offset); |
| 788 | if (ret < 0) { |
| 789 | r = ret; |
| 790 | break; |
| 791 | } |
| 792 | xfer = ret + hdr_size; |
| 793 | hdr_size = 0; |
| 794 | |
| 795 | req->length = xfer; |
| 796 | ret = usb_ep_queue(dev->ep_in, req, GFP_KERNEL); |
| 797 | if (ret < 0) { |
| 798 | DBG(cdev, "send_file_work: xfer error %d\n", ret); |
| 799 | dev->state = STATE_ERROR; |
| 800 | r = -EIO; |
| 801 | break; |
| 802 | } |
| 803 | |
| 804 | count -= xfer; |
| 805 | |
| 806 | /* zero this so we don't try to free it on error exit */ |
| 807 | req = 0; |
| 808 | } |
| 809 | |
| 810 | if (req) |
| 811 | mtp_req_put(dev, &dev->tx_idle, req); |
| 812 | |
| 813 | DBG(cdev, "send_file_work returning %d\n", r); |
| 814 | /* write the result */ |
| 815 | dev->xfer_result = r; |
| 816 | smp_wmb(); |
| 817 | } |
| 818 | |
| 819 | /* read from USB and write to a local file */ |
| 820 | static void receive_file_work(struct work_struct *data) |
| 821 | { |
| 822 | struct mtp_dev *dev = container_of(data, struct mtp_dev, |
| 823 | receive_file_work); |
| 824 | struct usb_composite_dev *cdev = dev->cdev; |
| 825 | struct usb_request *read_req = NULL, *write_req = NULL; |
| 826 | struct file *filp; |
| 827 | loff_t offset; |
zhang sanshan | 70b8b07 | 2017-09-17 12:00:55 +0800 | [diff] [blame] | 828 | int64_t count, len; |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 829 | int ret, cur_buf = 0; |
| 830 | int r = 0; |
| 831 | |
| 832 | /* read our parameters */ |
| 833 | smp_rmb(); |
| 834 | filp = dev->xfer_file; |
| 835 | offset = dev->xfer_file_offset; |
| 836 | count = dev->xfer_file_length; |
| 837 | |
| 838 | DBG(cdev, "receive_file_work(%lld)\n", count); |
| 839 | |
| 840 | while (count > 0 || write_req) { |
| 841 | if (count > 0) { |
| 842 | /* queue a request */ |
| 843 | read_req = dev->rx_req[cur_buf]; |
| 844 | cur_buf = (cur_buf + 1) % RX_REQ_MAX; |
| 845 | |
zhang sanshan | 70b8b07 | 2017-09-17 12:00:55 +0800 | [diff] [blame] | 846 | len = usb_ep_align_maybe(cdev->gadget, dev->ep_out, count); |
| 847 | if (len > MTP_BULK_BUFFER_SIZE) |
| 848 | len = MTP_BULK_BUFFER_SIZE; |
| 849 | read_req->length = len; |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 850 | dev->rx_done = 0; |
| 851 | ret = usb_ep_queue(dev->ep_out, read_req, GFP_KERNEL); |
| 852 | if (ret < 0) { |
| 853 | r = -EIO; |
| 854 | dev->state = STATE_ERROR; |
| 855 | break; |
| 856 | } |
| 857 | } |
| 858 | |
| 859 | if (write_req) { |
| 860 | DBG(cdev, "rx %p %d\n", write_req, write_req->actual); |
| 861 | ret = vfs_write(filp, write_req->buf, write_req->actual, |
| 862 | &offset); |
| 863 | DBG(cdev, "vfs_write %d\n", ret); |
| 864 | if (ret != write_req->actual) { |
| 865 | r = -EIO; |
| 866 | dev->state = STATE_ERROR; |
| 867 | break; |
| 868 | } |
| 869 | write_req = NULL; |
| 870 | } |
| 871 | |
| 872 | if (read_req) { |
| 873 | /* wait for our last read to complete */ |
| 874 | ret = wait_event_interruptible(dev->read_wq, |
| 875 | dev->rx_done || dev->state != STATE_BUSY); |
| 876 | if (dev->state == STATE_CANCELED) { |
| 877 | r = -ECANCELED; |
| 878 | if (!dev->rx_done) |
| 879 | usb_ep_dequeue(dev->ep_out, read_req); |
| 880 | break; |
| 881 | } |
Jiebing Li | df5d320 | 2015-03-10 11:27:10 +0800 | [diff] [blame] | 882 | if (read_req->status) { |
| 883 | r = read_req->status; |
| 884 | break; |
| 885 | } |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 886 | /* if xfer_file_length is 0xFFFFFFFF, then we read until |
| 887 | * we get a zero length packet |
| 888 | */ |
| 889 | if (count != 0xFFFFFFFF) |
| 890 | count -= read_req->actual; |
| 891 | if (read_req->actual < read_req->length) { |
| 892 | /* |
| 893 | * short packet is used to signal EOF for |
| 894 | * sizes > 4 gig |
| 895 | */ |
| 896 | DBG(cdev, "got short packet\n"); |
| 897 | count = 0; |
| 898 | } |
| 899 | |
| 900 | write_req = read_req; |
| 901 | read_req = NULL; |
| 902 | } |
| 903 | } |
| 904 | |
| 905 | DBG(cdev, "receive_file_work returning %d\n", r); |
| 906 | /* write the result */ |
| 907 | dev->xfer_result = r; |
| 908 | smp_wmb(); |
| 909 | } |
| 910 | |
| 911 | static int mtp_send_event(struct mtp_dev *dev, struct mtp_event *event) |
| 912 | { |
| 913 | struct usb_request *req = NULL; |
| 914 | int ret; |
| 915 | int length = event->length; |
| 916 | |
Greg Hackmann | 1b07ec7 | 2014-02-24 10:19:13 -0800 | [diff] [blame] | 917 | DBG(dev->cdev, "mtp_send_event(%zu)\n", event->length); |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 918 | |
| 919 | if (length < 0 || length > INTR_BUFFER_SIZE) |
| 920 | return -EINVAL; |
| 921 | if (dev->state == STATE_OFFLINE) |
| 922 | return -ENODEV; |
| 923 | |
| 924 | ret = wait_event_interruptible_timeout(dev->intr_wq, |
| 925 | (req = mtp_req_get(dev, &dev->intr_idle)), |
| 926 | msecs_to_jiffies(1000)); |
| 927 | if (!req) |
| 928 | return -ETIME; |
| 929 | |
| 930 | if (copy_from_user(req->buf, (void __user *)event->data, length)) { |
| 931 | mtp_req_put(dev, &dev->intr_idle, req); |
| 932 | return -EFAULT; |
| 933 | } |
| 934 | req->length = length; |
| 935 | ret = usb_ep_queue(dev->ep_intr, req, GFP_KERNEL); |
| 936 | if (ret) |
| 937 | mtp_req_put(dev, &dev->intr_idle, req); |
| 938 | |
| 939 | return ret; |
| 940 | } |
| 941 | |
| 942 | static long mtp_ioctl(struct file *fp, unsigned code, unsigned long value) |
| 943 | { |
| 944 | struct mtp_dev *dev = fp->private_data; |
| 945 | struct file *filp = NULL; |
| 946 | int ret = -EINVAL; |
| 947 | |
| 948 | if (mtp_lock(&dev->ioctl_excl)) |
| 949 | return -EBUSY; |
| 950 | |
| 951 | switch (code) { |
| 952 | case MTP_SEND_FILE: |
| 953 | case MTP_RECEIVE_FILE: |
| 954 | case MTP_SEND_FILE_WITH_HEADER: |
| 955 | { |
| 956 | struct mtp_file_range mfr; |
| 957 | struct work_struct *work; |
| 958 | |
| 959 | spin_lock_irq(&dev->lock); |
| 960 | if (dev->state == STATE_CANCELED) { |
| 961 | /* report cancelation to userspace */ |
| 962 | dev->state = STATE_READY; |
| 963 | spin_unlock_irq(&dev->lock); |
| 964 | ret = -ECANCELED; |
| 965 | goto out; |
| 966 | } |
| 967 | if (dev->state == STATE_OFFLINE) { |
| 968 | spin_unlock_irq(&dev->lock); |
| 969 | ret = -ENODEV; |
| 970 | goto out; |
| 971 | } |
| 972 | dev->state = STATE_BUSY; |
| 973 | spin_unlock_irq(&dev->lock); |
| 974 | |
| 975 | if (copy_from_user(&mfr, (void __user *)value, sizeof(mfr))) { |
| 976 | ret = -EFAULT; |
| 977 | goto fail; |
| 978 | } |
| 979 | /* hold a reference to the file while we are working with it */ |
| 980 | filp = fget(mfr.fd); |
| 981 | if (!filp) { |
| 982 | ret = -EBADF; |
| 983 | goto fail; |
| 984 | } |
| 985 | |
| 986 | /* write the parameters */ |
| 987 | dev->xfer_file = filp; |
| 988 | dev->xfer_file_offset = mfr.offset; |
| 989 | dev->xfer_file_length = mfr.length; |
| 990 | smp_wmb(); |
| 991 | |
| 992 | if (code == MTP_SEND_FILE_WITH_HEADER) { |
| 993 | work = &dev->send_file_work; |
| 994 | dev->xfer_send_header = 1; |
| 995 | dev->xfer_command = mfr.command; |
| 996 | dev->xfer_transaction_id = mfr.transaction_id; |
| 997 | } else if (code == MTP_SEND_FILE) { |
| 998 | work = &dev->send_file_work; |
| 999 | dev->xfer_send_header = 0; |
| 1000 | } else { |
| 1001 | work = &dev->receive_file_work; |
| 1002 | } |
| 1003 | |
| 1004 | /* We do the file transfer on a work queue so it will run |
| 1005 | * in kernel context, which is necessary for vfs_read and |
| 1006 | * vfs_write to use our buffers in the kernel address space. |
| 1007 | */ |
| 1008 | queue_work(dev->wq, work); |
| 1009 | /* wait for operation to complete */ |
| 1010 | flush_workqueue(dev->wq); |
| 1011 | fput(filp); |
| 1012 | |
| 1013 | /* read the result */ |
| 1014 | smp_rmb(); |
| 1015 | ret = dev->xfer_result; |
| 1016 | break; |
| 1017 | } |
| 1018 | case MTP_SEND_EVENT: |
| 1019 | { |
| 1020 | struct mtp_event event; |
| 1021 | /* return here so we don't change dev->state below, |
| 1022 | * which would interfere with bulk transfer state. |
| 1023 | */ |
| 1024 | if (copy_from_user(&event, (void __user *)value, sizeof(event))) |
| 1025 | ret = -EFAULT; |
| 1026 | else |
| 1027 | ret = mtp_send_event(dev, &event); |
| 1028 | goto out; |
| 1029 | } |
| 1030 | } |
| 1031 | |
| 1032 | fail: |
| 1033 | spin_lock_irq(&dev->lock); |
| 1034 | if (dev->state == STATE_CANCELED) |
| 1035 | ret = -ECANCELED; |
| 1036 | else if (dev->state != STATE_OFFLINE) |
| 1037 | dev->state = STATE_READY; |
| 1038 | spin_unlock_irq(&dev->lock); |
| 1039 | out: |
| 1040 | mtp_unlock(&dev->ioctl_excl); |
| 1041 | DBG(dev->cdev, "ioctl returning %d\n", ret); |
| 1042 | return ret; |
| 1043 | } |
| 1044 | |
| 1045 | static int mtp_open(struct inode *ip, struct file *fp) |
| 1046 | { |
| 1047 | printk(KERN_INFO "mtp_open\n"); |
| 1048 | if (mtp_lock(&_mtp_dev->open_excl)) |
| 1049 | return -EBUSY; |
| 1050 | |
| 1051 | /* clear any error condition */ |
| 1052 | if (_mtp_dev->state != STATE_OFFLINE) |
| 1053 | _mtp_dev->state = STATE_READY; |
| 1054 | |
| 1055 | fp->private_data = _mtp_dev; |
| 1056 | return 0; |
| 1057 | } |
| 1058 | |
| 1059 | static int mtp_release(struct inode *ip, struct file *fp) |
| 1060 | { |
| 1061 | printk(KERN_INFO "mtp_release\n"); |
| 1062 | |
| 1063 | mtp_unlock(&_mtp_dev->open_excl); |
| 1064 | return 0; |
| 1065 | } |
| 1066 | |
| 1067 | /* file operations for /dev/mtp_usb */ |
| 1068 | static const struct file_operations mtp_fops = { |
| 1069 | .owner = THIS_MODULE, |
| 1070 | .read = mtp_read, |
| 1071 | .write = mtp_write, |
| 1072 | .unlocked_ioctl = mtp_ioctl, |
| 1073 | .open = mtp_open, |
| 1074 | .release = mtp_release, |
| 1075 | }; |
| 1076 | |
| 1077 | static struct miscdevice mtp_device = { |
| 1078 | .minor = MISC_DYNAMIC_MINOR, |
| 1079 | .name = mtp_shortname, |
| 1080 | .fops = &mtp_fops, |
| 1081 | }; |
| 1082 | |
| 1083 | static int mtp_ctrlrequest(struct usb_composite_dev *cdev, |
| 1084 | const struct usb_ctrlrequest *ctrl) |
| 1085 | { |
| 1086 | struct mtp_dev *dev = _mtp_dev; |
| 1087 | int value = -EOPNOTSUPP; |
| 1088 | u16 w_index = le16_to_cpu(ctrl->wIndex); |
| 1089 | u16 w_value = le16_to_cpu(ctrl->wValue); |
| 1090 | u16 w_length = le16_to_cpu(ctrl->wLength); |
| 1091 | unsigned long flags; |
| 1092 | |
| 1093 | VDBG(cdev, "mtp_ctrlrequest " |
| 1094 | "%02x.%02x v%04x i%04x l%u\n", |
| 1095 | ctrl->bRequestType, ctrl->bRequest, |
| 1096 | w_value, w_index, w_length); |
| 1097 | |
| 1098 | /* Handle MTP OS string */ |
| 1099 | if (ctrl->bRequestType == |
| 1100 | (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE) |
| 1101 | && ctrl->bRequest == USB_REQ_GET_DESCRIPTOR |
| 1102 | && (w_value >> 8) == USB_DT_STRING |
| 1103 | && (w_value & 0xFF) == MTP_OS_STRING_ID) { |
| 1104 | value = (w_length < sizeof(mtp_os_string) |
| 1105 | ? w_length : sizeof(mtp_os_string)); |
| 1106 | memcpy(cdev->req->buf, mtp_os_string, value); |
| 1107 | } else if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR) { |
| 1108 | /* Handle MTP OS descriptor */ |
| 1109 | DBG(cdev, "vendor request: %d index: %d value: %d length: %d\n", |
| 1110 | ctrl->bRequest, w_index, w_value, w_length); |
| 1111 | |
| 1112 | if (ctrl->bRequest == 1 |
| 1113 | && (ctrl->bRequestType & USB_DIR_IN) |
| 1114 | && (w_index == 4 || w_index == 5)) { |
| 1115 | value = (w_length < sizeof(mtp_ext_config_desc) ? |
| 1116 | w_length : sizeof(mtp_ext_config_desc)); |
| 1117 | memcpy(cdev->req->buf, &mtp_ext_config_desc, value); |
| 1118 | } |
| 1119 | } else if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) { |
| 1120 | DBG(cdev, "class request: %d index: %d value: %d length: %d\n", |
| 1121 | ctrl->bRequest, w_index, w_value, w_length); |
| 1122 | |
| 1123 | if (ctrl->bRequest == MTP_REQ_CANCEL && w_index == 0 |
| 1124 | && w_value == 0) { |
| 1125 | DBG(cdev, "MTP_REQ_CANCEL\n"); |
| 1126 | |
| 1127 | spin_lock_irqsave(&dev->lock, flags); |
| 1128 | if (dev->state == STATE_BUSY) { |
| 1129 | dev->state = STATE_CANCELED; |
| 1130 | wake_up(&dev->read_wq); |
| 1131 | wake_up(&dev->write_wq); |
| 1132 | } |
| 1133 | spin_unlock_irqrestore(&dev->lock, flags); |
| 1134 | |
| 1135 | /* We need to queue a request to read the remaining |
| 1136 | * bytes, but we don't actually need to look at |
| 1137 | * the contents. |
| 1138 | */ |
| 1139 | value = w_length; |
| 1140 | } else if (ctrl->bRequest == MTP_REQ_GET_DEVICE_STATUS |
| 1141 | && w_index == 0 && w_value == 0) { |
| 1142 | struct mtp_device_status *status = cdev->req->buf; |
Anson Jacob | 051584e | 2016-11-11 01:10:04 -0500 | [diff] [blame] | 1143 | |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1144 | status->wLength = |
| 1145 | __constant_cpu_to_le16(sizeof(*status)); |
| 1146 | |
| 1147 | DBG(cdev, "MTP_REQ_GET_DEVICE_STATUS\n"); |
| 1148 | spin_lock_irqsave(&dev->lock, flags); |
| 1149 | /* device status is "busy" until we report |
| 1150 | * the cancelation to userspace |
| 1151 | */ |
| 1152 | if (dev->state == STATE_CANCELED) |
| 1153 | status->wCode = |
| 1154 | __cpu_to_le16(MTP_RESPONSE_DEVICE_BUSY); |
| 1155 | else |
| 1156 | status->wCode = |
| 1157 | __cpu_to_le16(MTP_RESPONSE_OK); |
| 1158 | spin_unlock_irqrestore(&dev->lock, flags); |
| 1159 | value = sizeof(*status); |
| 1160 | } |
| 1161 | } |
| 1162 | |
| 1163 | /* respond with data transfer or status phase? */ |
| 1164 | if (value >= 0) { |
| 1165 | int rc; |
Anson Jacob | 051584e | 2016-11-11 01:10:04 -0500 | [diff] [blame] | 1166 | |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1167 | cdev->req->zero = value < w_length; |
| 1168 | cdev->req->length = value; |
| 1169 | rc = usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC); |
| 1170 | if (rc < 0) |
| 1171 | ERROR(cdev, "%s: response queue error\n", __func__); |
| 1172 | } |
| 1173 | return value; |
| 1174 | } |
| 1175 | |
| 1176 | static int |
| 1177 | mtp_function_bind(struct usb_configuration *c, struct usb_function *f) |
| 1178 | { |
| 1179 | struct usb_composite_dev *cdev = c->cdev; |
| 1180 | struct mtp_dev *dev = func_to_mtp(f); |
| 1181 | int id; |
| 1182 | int ret; |
Badhri Jagan Sridharan | 38333b0 | 2015-10-06 20:32:01 -0700 | [diff] [blame] | 1183 | struct mtp_instance *fi_mtp; |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1184 | |
| 1185 | dev->cdev = cdev; |
| 1186 | DBG(cdev, "mtp_function_bind dev: %p\n", dev); |
| 1187 | |
| 1188 | /* allocate interface ID(s) */ |
| 1189 | id = usb_interface_id(c, f); |
| 1190 | if (id < 0) |
| 1191 | return id; |
| 1192 | mtp_interface_desc.bInterfaceNumber = id; |
| 1193 | |
Badhri Jagan Sridharan | eab46c4 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1194 | if (mtp_string_defs[INTERFACE_STRING_INDEX].id == 0) { |
| 1195 | ret = usb_string_id(c->cdev); |
| 1196 | if (ret < 0) |
| 1197 | return ret; |
| 1198 | mtp_string_defs[INTERFACE_STRING_INDEX].id = ret; |
| 1199 | mtp_interface_desc.iInterface = ret; |
| 1200 | } |
Badhri Jagan Sridharan | 38333b0 | 2015-10-06 20:32:01 -0700 | [diff] [blame] | 1201 | |
| 1202 | fi_mtp = container_of(f->fi, struct mtp_instance, func_inst); |
| 1203 | |
| 1204 | if (cdev->use_os_string) { |
| 1205 | f->os_desc_table = kzalloc(sizeof(*f->os_desc_table), |
| 1206 | GFP_KERNEL); |
| 1207 | if (!f->os_desc_table) |
| 1208 | return -ENOMEM; |
| 1209 | f->os_desc_n = 1; |
| 1210 | f->os_desc_table[0].os_desc = &fi_mtp->mtp_os_desc; |
| 1211 | } |
| 1212 | |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1213 | /* allocate endpoints */ |
| 1214 | ret = mtp_create_bulk_endpoints(dev, &mtp_fullspeed_in_desc, |
| 1215 | &mtp_fullspeed_out_desc, &mtp_intr_desc); |
| 1216 | if (ret) |
| 1217 | return ret; |
| 1218 | |
| 1219 | /* support high speed hardware */ |
| 1220 | if (gadget_is_dualspeed(c->cdev->gadget)) { |
| 1221 | mtp_highspeed_in_desc.bEndpointAddress = |
| 1222 | mtp_fullspeed_in_desc.bEndpointAddress; |
| 1223 | mtp_highspeed_out_desc.bEndpointAddress = |
| 1224 | mtp_fullspeed_out_desc.bEndpointAddress; |
| 1225 | } |
Mark Kuo | b115a6f | 2015-08-20 13:01:46 +0800 | [diff] [blame] | 1226 | /* support super speed hardware */ |
| 1227 | if (gadget_is_superspeed(c->cdev->gadget)) { |
| 1228 | unsigned max_burst; |
| 1229 | |
| 1230 | /* Calculate bMaxBurst, we know packet size is 1024 */ |
| 1231 | max_burst = min_t(unsigned, MTP_BULK_BUFFER_SIZE / 1024, 15); |
| 1232 | mtp_ss_in_desc.bEndpointAddress = |
| 1233 | mtp_fullspeed_in_desc.bEndpointAddress; |
| 1234 | mtp_ss_in_comp_desc.bMaxBurst = max_burst; |
| 1235 | mtp_ss_out_desc.bEndpointAddress = |
| 1236 | mtp_fullspeed_out_desc.bEndpointAddress; |
| 1237 | mtp_ss_out_comp_desc.bMaxBurst = max_burst; |
| 1238 | } |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1239 | |
| 1240 | DBG(cdev, "%s speed %s: IN/%s, OUT/%s\n", |
Mark Kuo | b115a6f | 2015-08-20 13:01:46 +0800 | [diff] [blame] | 1241 | gadget_is_superspeed(c->cdev->gadget) ? "super" : |
| 1242 | (gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full"), |
| 1243 | f->name, dev->ep_in->name, dev->ep_out->name); |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1244 | return 0; |
| 1245 | } |
| 1246 | |
| 1247 | static void |
| 1248 | mtp_function_unbind(struct usb_configuration *c, struct usb_function *f) |
| 1249 | { |
| 1250 | struct mtp_dev *dev = func_to_mtp(f); |
| 1251 | struct usb_request *req; |
| 1252 | int i; |
| 1253 | |
Badhri Jagan Sridharan | eab46c4 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1254 | mtp_string_defs[INTERFACE_STRING_INDEX].id = 0; |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1255 | while ((req = mtp_req_get(dev, &dev->tx_idle))) |
| 1256 | mtp_request_free(req, dev->ep_in); |
| 1257 | for (i = 0; i < RX_REQ_MAX; i++) |
| 1258 | mtp_request_free(dev->rx_req[i], dev->ep_out); |
| 1259 | while ((req = mtp_req_get(dev, &dev->intr_idle))) |
| 1260 | mtp_request_free(req, dev->ep_intr); |
| 1261 | dev->state = STATE_OFFLINE; |
Badhri Jagan Sridharan | 38333b0 | 2015-10-06 20:32:01 -0700 | [diff] [blame] | 1262 | kfree(f->os_desc_table); |
| 1263 | f->os_desc_n = 0; |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1264 | } |
| 1265 | |
| 1266 | static int mtp_function_set_alt(struct usb_function *f, |
| 1267 | unsigned intf, unsigned alt) |
| 1268 | { |
| 1269 | struct mtp_dev *dev = func_to_mtp(f); |
| 1270 | struct usb_composite_dev *cdev = f->config->cdev; |
| 1271 | int ret; |
| 1272 | |
| 1273 | DBG(cdev, "mtp_function_set_alt intf: %d alt: %d\n", intf, alt); |
| 1274 | |
| 1275 | ret = config_ep_by_speed(cdev->gadget, f, dev->ep_in); |
| 1276 | if (ret) |
| 1277 | return ret; |
| 1278 | |
| 1279 | ret = usb_ep_enable(dev->ep_in); |
| 1280 | if (ret) |
| 1281 | return ret; |
| 1282 | |
| 1283 | ret = config_ep_by_speed(cdev->gadget, f, dev->ep_out); |
| 1284 | if (ret) |
| 1285 | return ret; |
| 1286 | |
| 1287 | ret = usb_ep_enable(dev->ep_out); |
| 1288 | if (ret) { |
| 1289 | usb_ep_disable(dev->ep_in); |
| 1290 | return ret; |
| 1291 | } |
| 1292 | |
| 1293 | ret = config_ep_by_speed(cdev->gadget, f, dev->ep_intr); |
| 1294 | if (ret) |
| 1295 | return ret; |
| 1296 | |
| 1297 | ret = usb_ep_enable(dev->ep_intr); |
| 1298 | if (ret) { |
| 1299 | usb_ep_disable(dev->ep_out); |
| 1300 | usb_ep_disable(dev->ep_in); |
| 1301 | return ret; |
| 1302 | } |
| 1303 | dev->state = STATE_READY; |
| 1304 | |
| 1305 | /* readers may be blocked waiting for us to go online */ |
| 1306 | wake_up(&dev->read_wq); |
| 1307 | return 0; |
| 1308 | } |
| 1309 | |
| 1310 | static void mtp_function_disable(struct usb_function *f) |
| 1311 | { |
| 1312 | struct mtp_dev *dev = func_to_mtp(f); |
| 1313 | struct usb_composite_dev *cdev = dev->cdev; |
| 1314 | |
| 1315 | DBG(cdev, "mtp_function_disable\n"); |
| 1316 | dev->state = STATE_OFFLINE; |
| 1317 | usb_ep_disable(dev->ep_in); |
| 1318 | usb_ep_disable(dev->ep_out); |
| 1319 | usb_ep_disable(dev->ep_intr); |
| 1320 | |
| 1321 | /* readers may be blocked waiting for us to go online */ |
| 1322 | wake_up(&dev->read_wq); |
| 1323 | |
| 1324 | VDBG(cdev, "%s disabled\n", dev->function.name); |
| 1325 | } |
| 1326 | |
Badhri Jagan Sridharan | eab46c4 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1327 | static int __mtp_setup(struct mtp_instance *fi_mtp) |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1328 | { |
| 1329 | struct mtp_dev *dev; |
| 1330 | int ret; |
| 1331 | |
| 1332 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
Badhri Jagan Sridharan | eab46c4 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1333 | |
| 1334 | if (fi_mtp != NULL) |
| 1335 | fi_mtp->dev = dev; |
| 1336 | |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1337 | if (!dev) |
| 1338 | return -ENOMEM; |
| 1339 | |
| 1340 | spin_lock_init(&dev->lock); |
| 1341 | init_waitqueue_head(&dev->read_wq); |
| 1342 | init_waitqueue_head(&dev->write_wq); |
| 1343 | init_waitqueue_head(&dev->intr_wq); |
| 1344 | atomic_set(&dev->open_excl, 0); |
| 1345 | atomic_set(&dev->ioctl_excl, 0); |
| 1346 | INIT_LIST_HEAD(&dev->tx_idle); |
| 1347 | INIT_LIST_HEAD(&dev->intr_idle); |
| 1348 | |
| 1349 | dev->wq = create_singlethread_workqueue("f_mtp"); |
| 1350 | if (!dev->wq) { |
| 1351 | ret = -ENOMEM; |
| 1352 | goto err1; |
| 1353 | } |
| 1354 | INIT_WORK(&dev->send_file_work, send_file_work); |
| 1355 | INIT_WORK(&dev->receive_file_work, receive_file_work); |
| 1356 | |
| 1357 | _mtp_dev = dev; |
| 1358 | |
| 1359 | ret = misc_register(&mtp_device); |
| 1360 | if (ret) |
| 1361 | goto err2; |
| 1362 | |
| 1363 | return 0; |
| 1364 | |
| 1365 | err2: |
| 1366 | destroy_workqueue(dev->wq); |
| 1367 | err1: |
| 1368 | _mtp_dev = NULL; |
| 1369 | kfree(dev); |
| 1370 | printk(KERN_ERR "mtp gadget driver failed to initialize\n"); |
| 1371 | return ret; |
| 1372 | } |
| 1373 | |
Badhri Jagan Sridharan | eab46c4 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1374 | static int mtp_setup_configfs(struct mtp_instance *fi_mtp) |
| 1375 | { |
| 1376 | return __mtp_setup(fi_mtp); |
| 1377 | } |
| 1378 | |
| 1379 | |
Benoit Goby | 7a6d39e | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1380 | static void mtp_cleanup(void) |
| 1381 | { |
| 1382 | struct mtp_dev *dev = _mtp_dev; |
| 1383 | |
| 1384 | if (!dev) |
| 1385 | return; |
| 1386 | |
| 1387 | misc_deregister(&mtp_device); |
| 1388 | destroy_workqueue(dev->wq); |
| 1389 | _mtp_dev = NULL; |
| 1390 | kfree(dev); |
| 1391 | } |
Badhri Jagan Sridharan | eab46c4 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1392 | |
| 1393 | static struct mtp_instance *to_mtp_instance(struct config_item *item) |
| 1394 | { |
| 1395 | return container_of(to_config_group(item), struct mtp_instance, |
| 1396 | func_inst.group); |
| 1397 | } |
| 1398 | |
| 1399 | static void mtp_attr_release(struct config_item *item) |
| 1400 | { |
| 1401 | struct mtp_instance *fi_mtp = to_mtp_instance(item); |
Anson Jacob | 051584e | 2016-11-11 01:10:04 -0500 | [diff] [blame] | 1402 | |
Badhri Jagan Sridharan | eab46c4 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1403 | usb_put_function_instance(&fi_mtp->func_inst); |
| 1404 | } |
| 1405 | |
| 1406 | static struct configfs_item_operations mtp_item_ops = { |
| 1407 | .release = mtp_attr_release, |
| 1408 | }; |
| 1409 | |
| 1410 | static struct config_item_type mtp_func_type = { |
| 1411 | .ct_item_ops = &mtp_item_ops, |
| 1412 | .ct_owner = THIS_MODULE, |
| 1413 | }; |
| 1414 | |
| 1415 | |
| 1416 | static struct mtp_instance *to_fi_mtp(struct usb_function_instance *fi) |
| 1417 | { |
| 1418 | return container_of(fi, struct mtp_instance, func_inst); |
| 1419 | } |
| 1420 | |
| 1421 | static int mtp_set_inst_name(struct usb_function_instance *fi, const char *name) |
| 1422 | { |
| 1423 | struct mtp_instance *fi_mtp; |
| 1424 | char *ptr; |
| 1425 | int name_len; |
| 1426 | |
| 1427 | name_len = strlen(name) + 1; |
| 1428 | if (name_len > MAX_INST_NAME_LEN) |
| 1429 | return -ENAMETOOLONG; |
| 1430 | |
| 1431 | ptr = kstrndup(name, name_len, GFP_KERNEL); |
| 1432 | if (!ptr) |
| 1433 | return -ENOMEM; |
| 1434 | |
| 1435 | fi_mtp = to_fi_mtp(fi); |
| 1436 | fi_mtp->name = ptr; |
| 1437 | |
| 1438 | return 0; |
| 1439 | } |
| 1440 | |
| 1441 | static void mtp_free_inst(struct usb_function_instance *fi) |
| 1442 | { |
| 1443 | struct mtp_instance *fi_mtp; |
| 1444 | |
| 1445 | fi_mtp = to_fi_mtp(fi); |
| 1446 | kfree(fi_mtp->name); |
| 1447 | mtp_cleanup(); |
| 1448 | kfree(fi_mtp); |
| 1449 | } |
| 1450 | |
| 1451 | struct usb_function_instance *alloc_inst_mtp_ptp(bool mtp_config) |
| 1452 | { |
| 1453 | struct mtp_instance *fi_mtp; |
| 1454 | int ret = 0; |
Badhri Jagan Sridharan | 38333b0 | 2015-10-06 20:32:01 -0700 | [diff] [blame] | 1455 | struct usb_os_desc *descs[1]; |
| 1456 | char *names[1]; |
Badhri Jagan Sridharan | eab46c4 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1457 | |
| 1458 | fi_mtp = kzalloc(sizeof(*fi_mtp), GFP_KERNEL); |
| 1459 | if (!fi_mtp) |
| 1460 | return ERR_PTR(-ENOMEM); |
| 1461 | fi_mtp->func_inst.set_inst_name = mtp_set_inst_name; |
| 1462 | fi_mtp->func_inst.free_func_inst = mtp_free_inst; |
| 1463 | |
Badhri Jagan Sridharan | 38333b0 | 2015-10-06 20:32:01 -0700 | [diff] [blame] | 1464 | fi_mtp->mtp_os_desc.ext_compat_id = fi_mtp->mtp_ext_compat_id; |
| 1465 | INIT_LIST_HEAD(&fi_mtp->mtp_os_desc.ext_prop); |
| 1466 | descs[0] = &fi_mtp->mtp_os_desc; |
| 1467 | names[0] = "MTP"; |
| 1468 | |
Badhri Jagan Sridharan | eab46c4 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1469 | if (mtp_config) { |
| 1470 | ret = mtp_setup_configfs(fi_mtp); |
| 1471 | if (ret) { |
| 1472 | kfree(fi_mtp); |
| 1473 | pr_err("Error setting MTP\n"); |
| 1474 | return ERR_PTR(ret); |
| 1475 | } |
| 1476 | } else |
| 1477 | fi_mtp->dev = _mtp_dev; |
| 1478 | |
| 1479 | config_group_init_type_name(&fi_mtp->func_inst.group, |
| 1480 | "", &mtp_func_type); |
Badhri Jagan Sridharan | 38333b0 | 2015-10-06 20:32:01 -0700 | [diff] [blame] | 1481 | usb_os_desc_prepare_interf_dir(&fi_mtp->func_inst.group, 1, |
| 1482 | descs, names, THIS_MODULE); |
Badhri Jagan Sridharan | eab46c4 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1483 | |
| 1484 | return &fi_mtp->func_inst; |
| 1485 | } |
| 1486 | EXPORT_SYMBOL_GPL(alloc_inst_mtp_ptp); |
| 1487 | |
| 1488 | static struct usb_function_instance *mtp_alloc_inst(void) |
| 1489 | { |
| 1490 | return alloc_inst_mtp_ptp(true); |
| 1491 | } |
| 1492 | |
| 1493 | static int mtp_ctrlreq_configfs(struct usb_function *f, |
| 1494 | const struct usb_ctrlrequest *ctrl) |
| 1495 | { |
| 1496 | return mtp_ctrlrequest(f->config->cdev, ctrl); |
| 1497 | } |
| 1498 | |
| 1499 | static void mtp_free(struct usb_function *f) |
| 1500 | { |
| 1501 | /*NO-OP: no function specific resource allocation in mtp_alloc*/ |
| 1502 | } |
| 1503 | |
| 1504 | struct usb_function *function_alloc_mtp_ptp(struct usb_function_instance *fi, |
| 1505 | bool mtp_config) |
| 1506 | { |
| 1507 | struct mtp_instance *fi_mtp = to_fi_mtp(fi); |
Amit Pundir | 171b812 | 2015-08-01 03:26:51 +0530 | [diff] [blame] | 1508 | struct mtp_dev *dev; |
Badhri Jagan Sridharan | eab46c4 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1509 | |
Amit Pundir | 171b812 | 2015-08-01 03:26:51 +0530 | [diff] [blame] | 1510 | /* |
| 1511 | * PTP piggybacks on MTP function so make sure we have |
| 1512 | * created MTP function before we associate this PTP |
| 1513 | * function with a gadget configuration. |
| 1514 | */ |
| 1515 | if (fi_mtp->dev == NULL) { |
| 1516 | pr_err("Error: Create MTP function before linking" |
| 1517 | " PTP function with a gadget configuration\n"); |
| 1518 | pr_err("\t1: Delete existing PTP function if any\n"); |
| 1519 | pr_err("\t2: Create MTP function\n"); |
| 1520 | pr_err("\t3: Create and symlink PTP function" |
| 1521 | " with a gadget configuration\n"); |
Amit Pundir | f8e6ad2 | 2015-08-11 12:34:45 +0530 | [diff] [blame] | 1522 | return ERR_PTR(-EINVAL); /* Invalid Configuration */ |
Amit Pundir | 171b812 | 2015-08-01 03:26:51 +0530 | [diff] [blame] | 1523 | } |
| 1524 | |
| 1525 | dev = fi_mtp->dev; |
Badhri Jagan Sridharan | eab46c4 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1526 | dev->function.name = DRIVER_NAME; |
| 1527 | dev->function.strings = mtp_strings; |
| 1528 | if (mtp_config) { |
| 1529 | dev->function.fs_descriptors = fs_mtp_descs; |
| 1530 | dev->function.hs_descriptors = hs_mtp_descs; |
Mark Kuo | b115a6f | 2015-08-20 13:01:46 +0800 | [diff] [blame] | 1531 | dev->function.ss_descriptors = ss_mtp_descs; |
Badhri Jagan Sridharan | eab46c4 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1532 | } else { |
| 1533 | dev->function.fs_descriptors = fs_ptp_descs; |
| 1534 | dev->function.hs_descriptors = hs_ptp_descs; |
Mark Kuo | b115a6f | 2015-08-20 13:01:46 +0800 | [diff] [blame] | 1535 | dev->function.ss_descriptors = ss_ptp_descs; |
Badhri Jagan Sridharan | eab46c4 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1536 | } |
| 1537 | dev->function.bind = mtp_function_bind; |
| 1538 | dev->function.unbind = mtp_function_unbind; |
| 1539 | dev->function.set_alt = mtp_function_set_alt; |
| 1540 | dev->function.disable = mtp_function_disable; |
| 1541 | dev->function.setup = mtp_ctrlreq_configfs; |
| 1542 | dev->function.free_func = mtp_free; |
| 1543 | |
| 1544 | return &dev->function; |
| 1545 | } |
| 1546 | EXPORT_SYMBOL_GPL(function_alloc_mtp_ptp); |
| 1547 | |
| 1548 | static struct usb_function *mtp_alloc(struct usb_function_instance *fi) |
| 1549 | { |
| 1550 | return function_alloc_mtp_ptp(fi, true); |
| 1551 | } |
| 1552 | |
| 1553 | DECLARE_USB_FUNCTION_INIT(mtp, mtp_alloc_inst, mtp_alloc); |
| 1554 | MODULE_LICENSE("GPL"); |