Benoit Goby | 27d01e5 | 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 | |
Hemant Kumar | fc2b8f0 | 2016-05-02 11:18:48 -0700 | [diff] [blame] | 29 | #include <linux/seq_file.h> |
| 30 | #include <linux/debugfs.h> |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 31 | #include <linux/types.h> |
| 32 | #include <linux/file.h> |
| 33 | #include <linux/device.h> |
| 34 | #include <linux/miscdevice.h> |
| 35 | |
| 36 | #include <linux/usb.h> |
| 37 | #include <linux/usb_usual.h> |
| 38 | #include <linux/usb/ch9.h> |
| 39 | #include <linux/usb/f_mtp.h> |
Badhri Jagan Sridharan | f545f54 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 40 | #include <linux/configfs.h> |
| 41 | #include <linux/usb/composite.h> |
| 42 | |
| 43 | #include "configfs.h" |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 44 | |
Hemant Kumar | c044ad0 | 2016-05-02 11:27:21 -0700 | [diff] [blame] | 45 | #define MTP_RX_BUFFER_INIT_SIZE 1048576 |
Hemant Kumar | 28dd7c4 | 2016-12-29 15:47:31 -0800 | [diff] [blame] | 46 | #define MTP_TX_BUFFER_INIT_SIZE 1048576 |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 47 | #define MTP_BULK_BUFFER_SIZE 16384 |
| 48 | #define INTR_BUFFER_SIZE 28 |
Badhri Jagan Sridharan | f545f54 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 49 | #define MAX_INST_NAME_LEN 40 |
Witold Sciuk | 6db5c3e | 2016-02-13 11:08:37 +0100 | [diff] [blame] | 50 | #define MTP_MAX_FILE_SIZE 0xFFFFFFFFL |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 51 | |
| 52 | /* String IDs */ |
| 53 | #define INTERFACE_STRING_INDEX 0 |
| 54 | |
| 55 | /* values for mtp_dev.state */ |
| 56 | #define STATE_OFFLINE 0 /* initial state, disconnected */ |
| 57 | #define STATE_READY 1 /* ready for userspace calls */ |
| 58 | #define STATE_BUSY 2 /* processing userspace calls */ |
| 59 | #define STATE_CANCELED 3 /* transaction canceled by host */ |
| 60 | #define STATE_ERROR 4 /* error from completion routine */ |
| 61 | |
| 62 | /* number of tx and rx requests to allocate */ |
Hemant Kumar | c07309f | 2016-05-01 17:44:56 -0700 | [diff] [blame] | 63 | #define MTP_TX_REQ_MAX 8 |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 64 | #define RX_REQ_MAX 2 |
| 65 | #define INTR_REQ_MAX 5 |
| 66 | |
| 67 | /* ID for Microsoft MTP OS String */ |
| 68 | #define MTP_OS_STRING_ID 0xEE |
| 69 | |
| 70 | /* MTP class reqeusts */ |
| 71 | #define MTP_REQ_CANCEL 0x64 |
| 72 | #define MTP_REQ_GET_EXT_EVENT_DATA 0x65 |
| 73 | #define MTP_REQ_RESET 0x66 |
| 74 | #define MTP_REQ_GET_DEVICE_STATUS 0x67 |
| 75 | |
| 76 | /* constants for device status */ |
| 77 | #define MTP_RESPONSE_OK 0x2001 |
| 78 | #define MTP_RESPONSE_DEVICE_BUSY 0x2019 |
Badhri Jagan Sridharan | f545f54 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 79 | #define DRIVER_NAME "mtp" |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 80 | |
Hemant Kumar | fc2b8f0 | 2016-05-02 11:18:48 -0700 | [diff] [blame] | 81 | #define MAX_ITERATION 100 |
| 82 | |
Hemant Kumar | c044ad0 | 2016-05-02 11:27:21 -0700 | [diff] [blame] | 83 | unsigned int mtp_rx_req_len = MTP_RX_BUFFER_INIT_SIZE; |
Hemant Kumar | 4aed14e | 2016-05-01 17:35:36 -0700 | [diff] [blame] | 84 | module_param(mtp_rx_req_len, uint, 0644); |
| 85 | |
Hemant Kumar | 28dd7c4 | 2016-12-29 15:47:31 -0800 | [diff] [blame] | 86 | unsigned int mtp_tx_req_len = MTP_TX_BUFFER_INIT_SIZE; |
Hemant Kumar | c07309f | 2016-05-01 17:44:56 -0700 | [diff] [blame] | 87 | module_param(mtp_tx_req_len, uint, 0644); |
| 88 | |
| 89 | unsigned int mtp_tx_reqs = MTP_TX_REQ_MAX; |
| 90 | module_param(mtp_tx_reqs, uint, 0644); |
| 91 | |
Badhri Jagan Sridharan | f545f54 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 92 | static const char mtp_shortname[] = DRIVER_NAME "_usb"; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 93 | |
| 94 | struct mtp_dev { |
| 95 | struct usb_function function; |
| 96 | struct usb_composite_dev *cdev; |
| 97 | spinlock_t lock; |
| 98 | |
| 99 | struct usb_ep *ep_in; |
| 100 | struct usb_ep *ep_out; |
| 101 | struct usb_ep *ep_intr; |
| 102 | |
| 103 | int state; |
| 104 | |
| 105 | /* synchronize access to our device file */ |
| 106 | atomic_t open_excl; |
| 107 | /* to enforce only one ioctl at a time */ |
| 108 | atomic_t ioctl_excl; |
| 109 | |
| 110 | struct list_head tx_idle; |
| 111 | struct list_head intr_idle; |
| 112 | |
| 113 | wait_queue_head_t read_wq; |
| 114 | wait_queue_head_t write_wq; |
| 115 | wait_queue_head_t intr_wq; |
| 116 | struct usb_request *rx_req[RX_REQ_MAX]; |
| 117 | int rx_done; |
| 118 | |
| 119 | /* for processing MTP_SEND_FILE, MTP_RECEIVE_FILE and |
| 120 | * MTP_SEND_FILE_WITH_HEADER ioctls on a work queue |
| 121 | */ |
| 122 | struct workqueue_struct *wq; |
| 123 | struct work_struct send_file_work; |
| 124 | struct work_struct receive_file_work; |
| 125 | struct file *xfer_file; |
| 126 | loff_t xfer_file_offset; |
| 127 | int64_t xfer_file_length; |
| 128 | unsigned xfer_send_header; |
| 129 | uint16_t xfer_command; |
| 130 | uint32_t xfer_transaction_id; |
| 131 | int xfer_result; |
Hemant Kumar | fc2b8f0 | 2016-05-02 11:18:48 -0700 | [diff] [blame] | 132 | struct { |
| 133 | unsigned long vfs_rbytes; |
| 134 | unsigned long vfs_wbytes; |
| 135 | unsigned int vfs_rtime; |
| 136 | unsigned int vfs_wtime; |
| 137 | } perf[MAX_ITERATION]; |
| 138 | unsigned int dbg_read_index; |
| 139 | unsigned int dbg_write_index; |
Vijayavardhan Vennapusa | b28d3e8 | 2017-02-16 15:22:14 +0530 | [diff] [blame] | 140 | struct mutex read_mutex; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 141 | }; |
| 142 | |
| 143 | static struct usb_interface_descriptor mtp_interface_desc = { |
| 144 | .bLength = USB_DT_INTERFACE_SIZE, |
| 145 | .bDescriptorType = USB_DT_INTERFACE, |
| 146 | .bInterfaceNumber = 0, |
| 147 | .bNumEndpoints = 3, |
| 148 | .bInterfaceClass = USB_CLASS_VENDOR_SPEC, |
| 149 | .bInterfaceSubClass = USB_SUBCLASS_VENDOR_SPEC, |
| 150 | .bInterfaceProtocol = 0, |
| 151 | }; |
| 152 | |
| 153 | static struct usb_interface_descriptor ptp_interface_desc = { |
| 154 | .bLength = USB_DT_INTERFACE_SIZE, |
| 155 | .bDescriptorType = USB_DT_INTERFACE, |
| 156 | .bInterfaceNumber = 0, |
| 157 | .bNumEndpoints = 3, |
| 158 | .bInterfaceClass = USB_CLASS_STILL_IMAGE, |
| 159 | .bInterfaceSubClass = 1, |
| 160 | .bInterfaceProtocol = 1, |
| 161 | }; |
| 162 | |
Mark Kuo | 1b61b27 | 2015-08-20 13:01:46 +0800 | [diff] [blame] | 163 | static struct usb_endpoint_descriptor mtp_ss_in_desc = { |
| 164 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 165 | .bDescriptorType = USB_DT_ENDPOINT, |
| 166 | .bEndpointAddress = USB_DIR_IN, |
| 167 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 168 | .wMaxPacketSize = __constant_cpu_to_le16(1024), |
| 169 | }; |
| 170 | |
| 171 | static struct usb_ss_ep_comp_descriptor mtp_ss_in_comp_desc = { |
| 172 | .bLength = sizeof(mtp_ss_in_comp_desc), |
| 173 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, |
| 174 | /* .bMaxBurst = DYNAMIC, */ |
| 175 | }; |
| 176 | |
| 177 | static struct usb_endpoint_descriptor mtp_ss_out_desc = { |
| 178 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 179 | .bDescriptorType = USB_DT_ENDPOINT, |
| 180 | .bEndpointAddress = USB_DIR_OUT, |
| 181 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 182 | .wMaxPacketSize = __constant_cpu_to_le16(1024), |
| 183 | }; |
| 184 | |
| 185 | static struct usb_ss_ep_comp_descriptor mtp_ss_out_comp_desc = { |
| 186 | .bLength = sizeof(mtp_ss_out_comp_desc), |
| 187 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, |
| 188 | /* .bMaxBurst = DYNAMIC, */ |
| 189 | }; |
| 190 | |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 191 | static struct usb_endpoint_descriptor mtp_highspeed_in_desc = { |
| 192 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 193 | .bDescriptorType = USB_DT_ENDPOINT, |
| 194 | .bEndpointAddress = USB_DIR_IN, |
| 195 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 196 | .wMaxPacketSize = __constant_cpu_to_le16(512), |
| 197 | }; |
| 198 | |
| 199 | static struct usb_endpoint_descriptor mtp_highspeed_out_desc = { |
| 200 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 201 | .bDescriptorType = USB_DT_ENDPOINT, |
| 202 | .bEndpointAddress = USB_DIR_OUT, |
| 203 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 204 | .wMaxPacketSize = __constant_cpu_to_le16(512), |
| 205 | }; |
| 206 | |
| 207 | static struct usb_endpoint_descriptor mtp_fullspeed_in_desc = { |
| 208 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 209 | .bDescriptorType = USB_DT_ENDPOINT, |
| 210 | .bEndpointAddress = USB_DIR_IN, |
| 211 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 212 | }; |
| 213 | |
| 214 | static struct usb_endpoint_descriptor mtp_fullspeed_out_desc = { |
| 215 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 216 | .bDescriptorType = USB_DT_ENDPOINT, |
| 217 | .bEndpointAddress = USB_DIR_OUT, |
| 218 | .bmAttributes = USB_ENDPOINT_XFER_BULK, |
| 219 | }; |
| 220 | |
| 221 | static struct usb_endpoint_descriptor mtp_intr_desc = { |
| 222 | .bLength = USB_DT_ENDPOINT_SIZE, |
| 223 | .bDescriptorType = USB_DT_ENDPOINT, |
| 224 | .bEndpointAddress = USB_DIR_IN, |
| 225 | .bmAttributes = USB_ENDPOINT_XFER_INT, |
| 226 | .wMaxPacketSize = __constant_cpu_to_le16(INTR_BUFFER_SIZE), |
| 227 | .bInterval = 6, |
| 228 | }; |
| 229 | |
Mark Kuo | 1b61b27 | 2015-08-20 13:01:46 +0800 | [diff] [blame] | 230 | static struct usb_ss_ep_comp_descriptor mtp_intr_ss_comp_desc = { |
| 231 | .bLength = sizeof(mtp_intr_ss_comp_desc), |
| 232 | .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, |
Mark Kuo | 21a3e93 | 2015-09-11 16:12:59 +0800 | [diff] [blame] | 233 | .wBytesPerInterval = cpu_to_le16(INTR_BUFFER_SIZE), |
Mark Kuo | 1b61b27 | 2015-08-20 13:01:46 +0800 | [diff] [blame] | 234 | }; |
| 235 | |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 236 | static struct usb_descriptor_header *fs_mtp_descs[] = { |
| 237 | (struct usb_descriptor_header *) &mtp_interface_desc, |
| 238 | (struct usb_descriptor_header *) &mtp_fullspeed_in_desc, |
| 239 | (struct usb_descriptor_header *) &mtp_fullspeed_out_desc, |
| 240 | (struct usb_descriptor_header *) &mtp_intr_desc, |
| 241 | NULL, |
| 242 | }; |
| 243 | |
| 244 | static struct usb_descriptor_header *hs_mtp_descs[] = { |
| 245 | (struct usb_descriptor_header *) &mtp_interface_desc, |
| 246 | (struct usb_descriptor_header *) &mtp_highspeed_in_desc, |
| 247 | (struct usb_descriptor_header *) &mtp_highspeed_out_desc, |
| 248 | (struct usb_descriptor_header *) &mtp_intr_desc, |
| 249 | NULL, |
| 250 | }; |
| 251 | |
Mark Kuo | 1b61b27 | 2015-08-20 13:01:46 +0800 | [diff] [blame] | 252 | static struct usb_descriptor_header *ss_mtp_descs[] = { |
| 253 | (struct usb_descriptor_header *) &mtp_interface_desc, |
| 254 | (struct usb_descriptor_header *) &mtp_ss_in_desc, |
| 255 | (struct usb_descriptor_header *) &mtp_ss_in_comp_desc, |
| 256 | (struct usb_descriptor_header *) &mtp_ss_out_desc, |
| 257 | (struct usb_descriptor_header *) &mtp_ss_out_comp_desc, |
| 258 | (struct usb_descriptor_header *) &mtp_intr_desc, |
| 259 | (struct usb_descriptor_header *) &mtp_intr_ss_comp_desc, |
| 260 | NULL, |
| 261 | }; |
| 262 | |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 263 | static struct usb_descriptor_header *fs_ptp_descs[] = { |
| 264 | (struct usb_descriptor_header *) &ptp_interface_desc, |
| 265 | (struct usb_descriptor_header *) &mtp_fullspeed_in_desc, |
| 266 | (struct usb_descriptor_header *) &mtp_fullspeed_out_desc, |
| 267 | (struct usb_descriptor_header *) &mtp_intr_desc, |
| 268 | NULL, |
| 269 | }; |
| 270 | |
| 271 | static struct usb_descriptor_header *hs_ptp_descs[] = { |
| 272 | (struct usb_descriptor_header *) &ptp_interface_desc, |
| 273 | (struct usb_descriptor_header *) &mtp_highspeed_in_desc, |
| 274 | (struct usb_descriptor_header *) &mtp_highspeed_out_desc, |
| 275 | (struct usb_descriptor_header *) &mtp_intr_desc, |
| 276 | NULL, |
| 277 | }; |
| 278 | |
Mark Kuo | 1b61b27 | 2015-08-20 13:01:46 +0800 | [diff] [blame] | 279 | static struct usb_descriptor_header *ss_ptp_descs[] = { |
| 280 | (struct usb_descriptor_header *) &ptp_interface_desc, |
| 281 | (struct usb_descriptor_header *) &mtp_ss_in_desc, |
| 282 | (struct usb_descriptor_header *) &mtp_ss_in_comp_desc, |
| 283 | (struct usb_descriptor_header *) &mtp_ss_out_desc, |
| 284 | (struct usb_descriptor_header *) &mtp_ss_out_comp_desc, |
| 285 | (struct usb_descriptor_header *) &mtp_intr_desc, |
| 286 | (struct usb_descriptor_header *) &mtp_intr_ss_comp_desc, |
| 287 | NULL, |
| 288 | }; |
| 289 | |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 290 | static struct usb_string mtp_string_defs[] = { |
| 291 | /* Naming interface "MTP" so libmtp will recognize us */ |
| 292 | [INTERFACE_STRING_INDEX].s = "MTP", |
| 293 | { }, /* end of list */ |
| 294 | }; |
| 295 | |
| 296 | static struct usb_gadget_strings mtp_string_table = { |
| 297 | .language = 0x0409, /* en-US */ |
| 298 | .strings = mtp_string_defs, |
| 299 | }; |
| 300 | |
| 301 | static struct usb_gadget_strings *mtp_strings[] = { |
| 302 | &mtp_string_table, |
| 303 | NULL, |
| 304 | }; |
| 305 | |
| 306 | /* Microsoft MTP OS String */ |
| 307 | static u8 mtp_os_string[] = { |
| 308 | 18, /* sizeof(mtp_os_string) */ |
| 309 | USB_DT_STRING, |
| 310 | /* Signature field: "MSFT100" */ |
| 311 | 'M', 0, 'S', 0, 'F', 0, 'T', 0, '1', 0, '0', 0, '0', 0, |
| 312 | /* vendor code */ |
| 313 | 1, |
| 314 | /* padding */ |
| 315 | 0 |
| 316 | }; |
| 317 | |
| 318 | /* Microsoft Extended Configuration Descriptor Header Section */ |
| 319 | struct mtp_ext_config_desc_header { |
| 320 | __le32 dwLength; |
| 321 | __u16 bcdVersion; |
| 322 | __le16 wIndex; |
| 323 | __u8 bCount; |
| 324 | __u8 reserved[7]; |
| 325 | }; |
| 326 | |
| 327 | /* Microsoft Extended Configuration Descriptor Function Section */ |
| 328 | struct mtp_ext_config_desc_function { |
| 329 | __u8 bFirstInterfaceNumber; |
| 330 | __u8 bInterfaceCount; |
| 331 | __u8 compatibleID[8]; |
| 332 | __u8 subCompatibleID[8]; |
| 333 | __u8 reserved[6]; |
| 334 | }; |
| 335 | |
| 336 | /* MTP Extended Configuration Descriptor */ |
Jack Pham | 5043924 | 2017-02-07 11:48:25 -0800 | [diff] [blame] | 337 | struct mtp_ext_config_desc { |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 338 | struct mtp_ext_config_desc_header header; |
| 339 | struct mtp_ext_config_desc_function function; |
Jack Pham | 5043924 | 2017-02-07 11:48:25 -0800 | [diff] [blame] | 340 | }; |
| 341 | |
| 342 | static struct mtp_ext_config_desc mtp_ext_config_desc = { |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 343 | .header = { |
| 344 | .dwLength = __constant_cpu_to_le32(sizeof(mtp_ext_config_desc)), |
| 345 | .bcdVersion = __constant_cpu_to_le16(0x0100), |
| 346 | .wIndex = __constant_cpu_to_le16(4), |
Brian Norris | e730462 | 2016-02-29 17:44:51 -0800 | [diff] [blame] | 347 | .bCount = 1, |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 348 | }, |
| 349 | .function = { |
| 350 | .bFirstInterfaceNumber = 0, |
| 351 | .bInterfaceCount = 1, |
| 352 | .compatibleID = { 'M', 'T', 'P' }, |
| 353 | }, |
| 354 | }; |
| 355 | |
| 356 | struct mtp_device_status { |
| 357 | __le16 wLength; |
| 358 | __le16 wCode; |
| 359 | }; |
| 360 | |
Colin Cross | ccebeef | 2013-11-07 13:08:15 -0800 | [diff] [blame] | 361 | struct mtp_data_header { |
| 362 | /* length of packet, including this header */ |
| 363 | __le32 length; |
| 364 | /* container type (2 for data packet) */ |
| 365 | __le16 type; |
| 366 | /* MTP command code */ |
| 367 | __le16 command; |
| 368 | /* MTP transaction ID */ |
| 369 | __le32 transaction_id; |
| 370 | }; |
| 371 | |
Badhri Jagan Sridharan | f545f54 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 372 | struct mtp_instance { |
| 373 | struct usb_function_instance func_inst; |
| 374 | const char *name; |
| 375 | struct mtp_dev *dev; |
Badhri Jagan Sridharan | 5485646 | 2015-10-06 20:32:01 -0700 | [diff] [blame] | 376 | char mtp_ext_compat_id[16]; |
| 377 | struct usb_os_desc mtp_os_desc; |
Badhri Jagan Sridharan | f545f54 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 378 | }; |
| 379 | |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 380 | /* temporary variable used between mtp_open() and mtp_gadget_bind() */ |
| 381 | static struct mtp_dev *_mtp_dev; |
| 382 | |
| 383 | static inline struct mtp_dev *func_to_mtp(struct usb_function *f) |
| 384 | { |
| 385 | return container_of(f, struct mtp_dev, function); |
| 386 | } |
| 387 | |
| 388 | static struct usb_request *mtp_request_new(struct usb_ep *ep, int buffer_size) |
| 389 | { |
| 390 | struct usb_request *req = usb_ep_alloc_request(ep, GFP_KERNEL); |
Anson Jacob | 051584e | 2016-11-11 01:10:04 -0500 | [diff] [blame] | 391 | |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 392 | if (!req) |
| 393 | return NULL; |
| 394 | |
| 395 | /* now allocate buffers for the requests */ |
| 396 | req->buf = kmalloc(buffer_size, GFP_KERNEL); |
| 397 | if (!req->buf) { |
| 398 | usb_ep_free_request(ep, req); |
| 399 | return NULL; |
| 400 | } |
| 401 | |
| 402 | return req; |
| 403 | } |
| 404 | |
| 405 | static void mtp_request_free(struct usb_request *req, struct usb_ep *ep) |
| 406 | { |
| 407 | if (req) { |
| 408 | kfree(req->buf); |
| 409 | usb_ep_free_request(ep, req); |
| 410 | } |
| 411 | } |
| 412 | |
| 413 | static inline int mtp_lock(atomic_t *excl) |
| 414 | { |
| 415 | if (atomic_inc_return(excl) == 1) { |
| 416 | return 0; |
| 417 | } else { |
| 418 | atomic_dec(excl); |
| 419 | return -1; |
| 420 | } |
| 421 | } |
| 422 | |
| 423 | static inline void mtp_unlock(atomic_t *excl) |
| 424 | { |
| 425 | atomic_dec(excl); |
| 426 | } |
| 427 | |
| 428 | /* add a request to the tail of a list */ |
| 429 | static void mtp_req_put(struct mtp_dev *dev, struct list_head *head, |
| 430 | struct usb_request *req) |
| 431 | { |
| 432 | unsigned long flags; |
| 433 | |
| 434 | spin_lock_irqsave(&dev->lock, flags); |
| 435 | list_add_tail(&req->list, head); |
| 436 | spin_unlock_irqrestore(&dev->lock, flags); |
| 437 | } |
| 438 | |
| 439 | /* remove a request from the head of a list */ |
| 440 | static struct usb_request |
| 441 | *mtp_req_get(struct mtp_dev *dev, struct list_head *head) |
| 442 | { |
| 443 | unsigned long flags; |
| 444 | struct usb_request *req; |
| 445 | |
| 446 | spin_lock_irqsave(&dev->lock, flags); |
| 447 | if (list_empty(head)) { |
| 448 | req = 0; |
| 449 | } else { |
| 450 | req = list_first_entry(head, struct usb_request, list); |
| 451 | list_del(&req->list); |
| 452 | } |
| 453 | spin_unlock_irqrestore(&dev->lock, flags); |
| 454 | return req; |
| 455 | } |
| 456 | |
| 457 | static void mtp_complete_in(struct usb_ep *ep, struct usb_request *req) |
| 458 | { |
| 459 | struct mtp_dev *dev = _mtp_dev; |
| 460 | |
ChandanaKishori Chiluveru | 9a7474a | 2015-11-13 11:25:52 +0530 | [diff] [blame] | 461 | if (req->status != 0 && dev->state != STATE_OFFLINE) |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 462 | dev->state = STATE_ERROR; |
| 463 | |
| 464 | mtp_req_put(dev, &dev->tx_idle, req); |
| 465 | |
| 466 | wake_up(&dev->write_wq); |
| 467 | } |
| 468 | |
| 469 | static void mtp_complete_out(struct usb_ep *ep, struct usb_request *req) |
| 470 | { |
| 471 | struct mtp_dev *dev = _mtp_dev; |
| 472 | |
| 473 | dev->rx_done = 1; |
ChandanaKishori Chiluveru | 9a7474a | 2015-11-13 11:25:52 +0530 | [diff] [blame] | 474 | if (req->status != 0 && dev->state != STATE_OFFLINE) |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 475 | dev->state = STATE_ERROR; |
| 476 | |
| 477 | wake_up(&dev->read_wq); |
| 478 | } |
| 479 | |
| 480 | static void mtp_complete_intr(struct usb_ep *ep, struct usb_request *req) |
| 481 | { |
| 482 | struct mtp_dev *dev = _mtp_dev; |
| 483 | |
ChandanaKishori Chiluveru | 9a7474a | 2015-11-13 11:25:52 +0530 | [diff] [blame] | 484 | if (req->status != 0 && dev->state != STATE_OFFLINE) |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 485 | dev->state = STATE_ERROR; |
| 486 | |
| 487 | mtp_req_put(dev, &dev->intr_idle, req); |
| 488 | |
| 489 | wake_up(&dev->intr_wq); |
| 490 | } |
| 491 | |
| 492 | static int mtp_create_bulk_endpoints(struct mtp_dev *dev, |
| 493 | struct usb_endpoint_descriptor *in_desc, |
| 494 | struct usb_endpoint_descriptor *out_desc, |
| 495 | struct usb_endpoint_descriptor *intr_desc) |
| 496 | { |
| 497 | struct usb_composite_dev *cdev = dev->cdev; |
| 498 | struct usb_request *req; |
| 499 | struct usb_ep *ep; |
| 500 | int i; |
| 501 | |
Chandana Kishori Chiluveru | 7f5670a | 2017-10-28 23:05:45 +0530 | [diff] [blame] | 502 | DBG(cdev, "create_bulk_endpoints dev: %pK\n", dev); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 503 | |
| 504 | ep = usb_ep_autoconfig(cdev->gadget, in_desc); |
| 505 | if (!ep) { |
| 506 | DBG(cdev, "usb_ep_autoconfig for ep_in failed\n"); |
| 507 | return -ENODEV; |
| 508 | } |
| 509 | DBG(cdev, "usb_ep_autoconfig for ep_in got %s\n", ep->name); |
| 510 | ep->driver_data = dev; /* claim the endpoint */ |
| 511 | dev->ep_in = ep; |
| 512 | |
| 513 | ep = usb_ep_autoconfig(cdev->gadget, out_desc); |
| 514 | if (!ep) { |
| 515 | DBG(cdev, "usb_ep_autoconfig for ep_out failed\n"); |
| 516 | return -ENODEV; |
| 517 | } |
| 518 | DBG(cdev, "usb_ep_autoconfig for mtp ep_out got %s\n", ep->name); |
| 519 | ep->driver_data = dev; /* claim the endpoint */ |
| 520 | dev->ep_out = ep; |
| 521 | |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 522 | ep = usb_ep_autoconfig(cdev->gadget, intr_desc); |
| 523 | if (!ep) { |
| 524 | DBG(cdev, "usb_ep_autoconfig for ep_intr failed\n"); |
| 525 | return -ENODEV; |
| 526 | } |
| 527 | DBG(cdev, "usb_ep_autoconfig for mtp ep_intr got %s\n", ep->name); |
| 528 | ep->driver_data = dev; /* claim the endpoint */ |
| 529 | dev->ep_intr = ep; |
| 530 | |
Hemant Kumar | c07309f | 2016-05-01 17:44:56 -0700 | [diff] [blame] | 531 | retry_tx_alloc: |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 532 | /* now allocate requests for our endpoints */ |
Hemant Kumar | c07309f | 2016-05-01 17:44:56 -0700 | [diff] [blame] | 533 | for (i = 0; i < mtp_tx_reqs; i++) { |
| 534 | req = mtp_request_new(dev->ep_in, mtp_tx_req_len); |
| 535 | if (!req) { |
| 536 | if (mtp_tx_req_len <= MTP_BULK_BUFFER_SIZE) |
| 537 | goto fail; |
| 538 | while ((req = mtp_req_get(dev, &dev->tx_idle))) |
| 539 | mtp_request_free(req, dev->ep_in); |
| 540 | mtp_tx_req_len = MTP_BULK_BUFFER_SIZE; |
| 541 | mtp_tx_reqs = MTP_TX_REQ_MAX; |
| 542 | goto retry_tx_alloc; |
| 543 | } |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 544 | req->complete = mtp_complete_in; |
| 545 | mtp_req_put(dev, &dev->tx_idle, req); |
| 546 | } |
Hemant Kumar | 4aed14e | 2016-05-01 17:35:36 -0700 | [diff] [blame] | 547 | |
| 548 | /* |
| 549 | * The RX buffer should be aligned to EP max packet for |
| 550 | * some controllers. At bind time, we don't know the |
| 551 | * operational speed. Hence assuming super speed max |
| 552 | * packet size. |
| 553 | */ |
| 554 | if (mtp_rx_req_len % 1024) |
| 555 | mtp_rx_req_len = MTP_BULK_BUFFER_SIZE; |
| 556 | |
| 557 | retry_rx_alloc: |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 558 | for (i = 0; i < RX_REQ_MAX; i++) { |
Hemant Kumar | 4aed14e | 2016-05-01 17:35:36 -0700 | [diff] [blame] | 559 | req = mtp_request_new(dev->ep_out, mtp_rx_req_len); |
| 560 | if (!req) { |
| 561 | if (mtp_rx_req_len <= MTP_BULK_BUFFER_SIZE) |
| 562 | goto fail; |
Hemant Kumar | a125871 | 2016-05-02 10:46:49 -0700 | [diff] [blame] | 563 | for (--i; i >= 0; i--) |
Hemant Kumar | 4aed14e | 2016-05-01 17:35:36 -0700 | [diff] [blame] | 564 | mtp_request_free(dev->rx_req[i], dev->ep_out); |
| 565 | mtp_rx_req_len = MTP_BULK_BUFFER_SIZE; |
| 566 | goto retry_rx_alloc; |
| 567 | } |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 568 | req->complete = mtp_complete_out; |
| 569 | dev->rx_req[i] = req; |
| 570 | } |
| 571 | for (i = 0; i < INTR_REQ_MAX; i++) { |
| 572 | req = mtp_request_new(dev->ep_intr, INTR_BUFFER_SIZE); |
| 573 | if (!req) |
| 574 | goto fail; |
| 575 | req->complete = mtp_complete_intr; |
| 576 | mtp_req_put(dev, &dev->intr_idle, req); |
| 577 | } |
| 578 | |
| 579 | return 0; |
| 580 | |
| 581 | fail: |
Badhri Jagan Sridharan | f545f54 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 582 | pr_err("mtp_bind() could not allocate requests\n"); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 583 | return -1; |
| 584 | } |
| 585 | |
| 586 | static ssize_t mtp_read(struct file *fp, char __user *buf, |
| 587 | size_t count, loff_t *pos) |
| 588 | { |
| 589 | struct mtp_dev *dev = fp->private_data; |
| 590 | struct usb_composite_dev *cdev = dev->cdev; |
| 591 | struct usb_request *req; |
Greg Hackmann | 1b07ec7 | 2014-02-24 10:19:13 -0800 | [diff] [blame] | 592 | ssize_t r = count; |
| 593 | unsigned xfer; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 594 | int ret = 0; |
Jiebing Li | 3bbd898 | 2015-03-10 11:25:50 +0800 | [diff] [blame] | 595 | size_t len = 0; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 596 | |
ChandanaKishori Chiluveru | 9a7474a | 2015-11-13 11:25:52 +0530 | [diff] [blame] | 597 | DBG(cdev, "mtp_read(%zu) state:%d\n", count, dev->state); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 598 | |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 599 | /* we will block until we're online */ |
| 600 | DBG(cdev, "mtp_read: waiting for online state\n"); |
| 601 | ret = wait_event_interruptible(dev->read_wq, |
| 602 | dev->state != STATE_OFFLINE); |
| 603 | if (ret < 0) { |
| 604 | r = ret; |
| 605 | goto done; |
| 606 | } |
Hemant Kumar | 63e7d79 | 2016-05-02 11:09:00 -0700 | [diff] [blame] | 607 | |
| 608 | len = ALIGN(count, dev->ep_out->maxpacket); |
| 609 | if (len > mtp_rx_req_len) |
| 610 | return -EINVAL; |
| 611 | |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 612 | spin_lock_irq(&dev->lock); |
Jiebing Li | 3bbd898 | 2015-03-10 11:25:50 +0800 | [diff] [blame] | 613 | if (dev->ep_out->desc) { |
| 614 | len = usb_ep_align_maybe(cdev->gadget, dev->ep_out, count); |
| 615 | if (len > MTP_BULK_BUFFER_SIZE) { |
| 616 | spin_unlock_irq(&dev->lock); |
| 617 | return -EINVAL; |
| 618 | } |
| 619 | } |
| 620 | |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 621 | if (dev->state == STATE_CANCELED) { |
| 622 | /* report cancelation to userspace */ |
| 623 | dev->state = STATE_READY; |
| 624 | spin_unlock_irq(&dev->lock); |
| 625 | return -ECANCELED; |
| 626 | } |
| 627 | dev->state = STATE_BUSY; |
| 628 | spin_unlock_irq(&dev->lock); |
| 629 | |
Vijayavardhan Vennapusa | b28d3e8 | 2017-02-16 15:22:14 +0530 | [diff] [blame] | 630 | mutex_lock(&dev->read_mutex); |
| 631 | if (dev->state == STATE_OFFLINE) { |
| 632 | r = -EIO; |
| 633 | mutex_unlock(&dev->read_mutex); |
| 634 | goto done; |
| 635 | } |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 636 | requeue_req: |
| 637 | /* queue a request */ |
| 638 | req = dev->rx_req[0]; |
Hemant Kumar | 96b01be | 2016-05-01 17:54:31 -0700 | [diff] [blame] | 639 | req->length = len; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 640 | dev->rx_done = 0; |
Vijayavardhan Vennapusa | b28d3e8 | 2017-02-16 15:22:14 +0530 | [diff] [blame] | 641 | mutex_unlock(&dev->read_mutex); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 642 | ret = usb_ep_queue(dev->ep_out, req, GFP_KERNEL); |
| 643 | if (ret < 0) { |
| 644 | r = -EIO; |
| 645 | goto done; |
| 646 | } else { |
Chandana Kishori Chiluveru | 7f5670a | 2017-10-28 23:05:45 +0530 | [diff] [blame] | 647 | DBG(cdev, "rx %pK queue\n", req); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 648 | } |
| 649 | |
| 650 | /* wait for a request to complete */ |
Hemant Kumar | 32565c2 | 2016-05-01 22:09:34 -0700 | [diff] [blame] | 651 | ret = wait_event_interruptible(dev->read_wq, |
| 652 | dev->rx_done || dev->state != STATE_BUSY); |
| 653 | if (dev->state == STATE_CANCELED) { |
| 654 | r = -ECANCELED; |
| 655 | if (!dev->rx_done) |
| 656 | usb_ep_dequeue(dev->ep_out, req); |
| 657 | spin_lock_irq(&dev->lock); |
| 658 | dev->state = STATE_CANCELED; |
| 659 | spin_unlock_irq(&dev->lock); |
| 660 | goto done; |
| 661 | } |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 662 | if (ret < 0) { |
| 663 | r = ret; |
| 664 | usb_ep_dequeue(dev->ep_out, req); |
| 665 | goto done; |
| 666 | } |
Vijayavardhan Vennapusa | b28d3e8 | 2017-02-16 15:22:14 +0530 | [diff] [blame] | 667 | mutex_lock(&dev->read_mutex); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 668 | if (dev->state == STATE_BUSY) { |
| 669 | /* If we got a 0-len packet, throw it back and try again. */ |
| 670 | if (req->actual == 0) |
| 671 | goto requeue_req; |
| 672 | |
Chandana Kishori Chiluveru | 7f5670a | 2017-10-28 23:05:45 +0530 | [diff] [blame] | 673 | DBG(cdev, "rx %pK %d\n", req, req->actual); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 674 | xfer = (req->actual < count) ? req->actual : count; |
| 675 | r = xfer; |
| 676 | if (copy_to_user(buf, req->buf, xfer)) |
| 677 | r = -EFAULT; |
| 678 | } else |
| 679 | r = -EIO; |
| 680 | |
Vijayavardhan Vennapusa | b28d3e8 | 2017-02-16 15:22:14 +0530 | [diff] [blame] | 681 | mutex_unlock(&dev->read_mutex); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 682 | done: |
| 683 | spin_lock_irq(&dev->lock); |
| 684 | if (dev->state == STATE_CANCELED) |
| 685 | r = -ECANCELED; |
| 686 | else if (dev->state != STATE_OFFLINE) |
| 687 | dev->state = STATE_READY; |
| 688 | spin_unlock_irq(&dev->lock); |
| 689 | |
ChandanaKishori Chiluveru | 9a7474a | 2015-11-13 11:25:52 +0530 | [diff] [blame] | 690 | DBG(cdev, "mtp_read returning %zd state:%d\n", r, dev->state); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 691 | return r; |
| 692 | } |
| 693 | |
| 694 | static ssize_t mtp_write(struct file *fp, const char __user *buf, |
| 695 | size_t count, loff_t *pos) |
| 696 | { |
| 697 | struct mtp_dev *dev = fp->private_data; |
| 698 | struct usb_composite_dev *cdev = dev->cdev; |
| 699 | struct usb_request *req = 0; |
Greg Hackmann | 3a725f4 | 2014-02-24 10:19:13 -0800 | [diff] [blame] | 700 | ssize_t r = count; |
| 701 | unsigned xfer; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 702 | int sendZLP = 0; |
| 703 | int ret; |
| 704 | |
ChandanaKishori Chiluveru | 9a7474a | 2015-11-13 11:25:52 +0530 | [diff] [blame] | 705 | DBG(cdev, "mtp_write(%zu) state:%d\n", count, dev->state); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 706 | |
| 707 | spin_lock_irq(&dev->lock); |
| 708 | if (dev->state == STATE_CANCELED) { |
| 709 | /* report cancelation to userspace */ |
| 710 | dev->state = STATE_READY; |
| 711 | spin_unlock_irq(&dev->lock); |
| 712 | return -ECANCELED; |
| 713 | } |
| 714 | if (dev->state == STATE_OFFLINE) { |
| 715 | spin_unlock_irq(&dev->lock); |
| 716 | return -ENODEV; |
| 717 | } |
| 718 | dev->state = STATE_BUSY; |
| 719 | spin_unlock_irq(&dev->lock); |
| 720 | |
| 721 | /* we need to send a zero length packet to signal the end of transfer |
| 722 | * if the transfer size is aligned to a packet boundary. |
| 723 | */ |
| 724 | if ((count & (dev->ep_in->maxpacket - 1)) == 0) |
| 725 | sendZLP = 1; |
| 726 | |
| 727 | while (count > 0 || sendZLP) { |
| 728 | /* so we exit after sending ZLP */ |
| 729 | if (count == 0) |
| 730 | sendZLP = 0; |
| 731 | |
| 732 | if (dev->state != STATE_BUSY) { |
| 733 | DBG(cdev, "mtp_write dev->error\n"); |
| 734 | r = -EIO; |
| 735 | break; |
| 736 | } |
| 737 | |
| 738 | /* get an idle tx request to use */ |
| 739 | req = 0; |
| 740 | ret = wait_event_interruptible(dev->write_wq, |
| 741 | ((req = mtp_req_get(dev, &dev->tx_idle)) |
| 742 | || dev->state != STATE_BUSY)); |
| 743 | if (!req) { |
ChandanaKishori Chiluveru | 9a7474a | 2015-11-13 11:25:52 +0530 | [diff] [blame] | 744 | DBG(cdev, "mtp_write request NULL ret:%d state:%d\n", |
| 745 | ret, dev->state); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 746 | r = ret; |
| 747 | break; |
| 748 | } |
| 749 | |
Hemant Kumar | 28dd7c4 | 2016-12-29 15:47:31 -0800 | [diff] [blame] | 750 | if (count > mtp_tx_req_len) |
| 751 | xfer = mtp_tx_req_len; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 752 | else |
| 753 | xfer = count; |
| 754 | if (xfer && copy_from_user(req->buf, buf, xfer)) { |
| 755 | r = -EFAULT; |
| 756 | break; |
| 757 | } |
| 758 | |
| 759 | req->length = xfer; |
| 760 | ret = usb_ep_queue(dev->ep_in, req, GFP_KERNEL); |
| 761 | if (ret < 0) { |
| 762 | DBG(cdev, "mtp_write: xfer error %d\n", ret); |
| 763 | r = -EIO; |
| 764 | break; |
| 765 | } |
| 766 | |
| 767 | buf += xfer; |
| 768 | count -= xfer; |
| 769 | |
| 770 | /* zero this so we don't try to free it on error exit */ |
| 771 | req = 0; |
| 772 | } |
| 773 | |
| 774 | if (req) |
| 775 | mtp_req_put(dev, &dev->tx_idle, req); |
| 776 | |
| 777 | spin_lock_irq(&dev->lock); |
| 778 | if (dev->state == STATE_CANCELED) |
| 779 | r = -ECANCELED; |
| 780 | else if (dev->state != STATE_OFFLINE) |
| 781 | dev->state = STATE_READY; |
| 782 | spin_unlock_irq(&dev->lock); |
| 783 | |
ChandanaKishori Chiluveru | 9a7474a | 2015-11-13 11:25:52 +0530 | [diff] [blame] | 784 | DBG(cdev, "mtp_write returning %zd state:%d\n", r, dev->state); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 785 | return r; |
| 786 | } |
| 787 | |
| 788 | /* read from a local file and write to USB */ |
| 789 | static void send_file_work(struct work_struct *data) |
| 790 | { |
| 791 | struct mtp_dev *dev = container_of(data, struct mtp_dev, |
| 792 | send_file_work); |
| 793 | struct usb_composite_dev *cdev = dev->cdev; |
| 794 | struct usb_request *req = 0; |
| 795 | struct mtp_data_header *header; |
| 796 | struct file *filp; |
| 797 | loff_t offset; |
| 798 | int64_t count; |
| 799 | int xfer, ret, hdr_size; |
| 800 | int r = 0; |
| 801 | int sendZLP = 0; |
Hemant Kumar | fc2b8f0 | 2016-05-02 11:18:48 -0700 | [diff] [blame] | 802 | ktime_t start_time; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 803 | |
| 804 | /* read our parameters */ |
| 805 | smp_rmb(); |
| 806 | filp = dev->xfer_file; |
| 807 | offset = dev->xfer_file_offset; |
| 808 | count = dev->xfer_file_length; |
| 809 | |
| 810 | DBG(cdev, "send_file_work(%lld %lld)\n", offset, count); |
| 811 | |
| 812 | if (dev->xfer_send_header) { |
| 813 | hdr_size = sizeof(struct mtp_data_header); |
| 814 | count += hdr_size; |
| 815 | } else { |
| 816 | hdr_size = 0; |
| 817 | } |
| 818 | |
| 819 | /* we need to send a zero length packet to signal the end of transfer |
| 820 | * if the transfer size is aligned to a packet boundary. |
| 821 | */ |
| 822 | if ((count & (dev->ep_in->maxpacket - 1)) == 0) |
| 823 | sendZLP = 1; |
| 824 | |
| 825 | while (count > 0 || sendZLP) { |
| 826 | /* so we exit after sending ZLP */ |
| 827 | if (count == 0) |
| 828 | sendZLP = 0; |
| 829 | |
| 830 | /* get an idle tx request to use */ |
| 831 | req = 0; |
| 832 | ret = wait_event_interruptible(dev->write_wq, |
| 833 | (req = mtp_req_get(dev, &dev->tx_idle)) |
| 834 | || dev->state != STATE_BUSY); |
| 835 | if (dev->state == STATE_CANCELED) { |
| 836 | r = -ECANCELED; |
| 837 | break; |
| 838 | } |
| 839 | if (!req) { |
ChandanaKishori Chiluveru | 9a7474a | 2015-11-13 11:25:52 +0530 | [diff] [blame] | 840 | DBG(cdev, |
| 841 | "send_file_work request NULL ret:%d state:%d\n", |
| 842 | ret, dev->state); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 843 | r = ret; |
| 844 | break; |
| 845 | } |
| 846 | |
Hemant Kumar | 28dd7c4 | 2016-12-29 15:47:31 -0800 | [diff] [blame] | 847 | if (count > mtp_tx_req_len) |
| 848 | xfer = mtp_tx_req_len; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 849 | else |
| 850 | xfer = count; |
| 851 | |
| 852 | if (hdr_size) { |
| 853 | /* prepend MTP data header */ |
| 854 | header = (struct mtp_data_header *)req->buf; |
Witold Sciuk | 6db5c3e | 2016-02-13 11:08:37 +0100 | [diff] [blame] | 855 | /* |
| 856 | * set file size with header according to |
| 857 | * MTP Specification v1.0 |
| 858 | */ |
| 859 | header->length = (count > MTP_MAX_FILE_SIZE) ? |
| 860 | MTP_MAX_FILE_SIZE : __cpu_to_le32(count); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 861 | header->type = __cpu_to_le16(2); /* data packet */ |
| 862 | header->command = __cpu_to_le16(dev->xfer_command); |
| 863 | header->transaction_id = |
| 864 | __cpu_to_le32(dev->xfer_transaction_id); |
| 865 | } |
Hemant Kumar | fc2b8f0 | 2016-05-02 11:18:48 -0700 | [diff] [blame] | 866 | start_time = ktime_get(); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 867 | ret = vfs_read(filp, req->buf + hdr_size, xfer - hdr_size, |
| 868 | &offset); |
| 869 | if (ret < 0) { |
| 870 | r = ret; |
| 871 | break; |
| 872 | } |
Hemant Kumar | fc2b8f0 | 2016-05-02 11:18:48 -0700 | [diff] [blame] | 873 | |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 874 | xfer = ret + hdr_size; |
Hemant Kumar | fc2b8f0 | 2016-05-02 11:18:48 -0700 | [diff] [blame] | 875 | dev->perf[dev->dbg_read_index].vfs_rtime = |
| 876 | ktime_to_us(ktime_sub(ktime_get(), start_time)); |
| 877 | dev->perf[dev->dbg_read_index].vfs_rbytes = xfer; |
| 878 | dev->dbg_read_index = (dev->dbg_read_index + 1) % MAX_ITERATION; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 879 | hdr_size = 0; |
| 880 | |
| 881 | req->length = xfer; |
| 882 | ret = usb_ep_queue(dev->ep_in, req, GFP_KERNEL); |
| 883 | if (ret < 0) { |
| 884 | DBG(cdev, "send_file_work: xfer error %d\n", ret); |
Hemant Kumar | 9bcbf7b | 2016-05-01 22:15:04 -0700 | [diff] [blame] | 885 | if (dev->state != STATE_OFFLINE) |
| 886 | dev->state = STATE_ERROR; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 887 | r = -EIO; |
| 888 | break; |
| 889 | } |
| 890 | |
| 891 | count -= xfer; |
| 892 | |
| 893 | /* zero this so we don't try to free it on error exit */ |
| 894 | req = 0; |
| 895 | } |
| 896 | |
| 897 | if (req) |
| 898 | mtp_req_put(dev, &dev->tx_idle, req); |
| 899 | |
ChandanaKishori Chiluveru | 9a7474a | 2015-11-13 11:25:52 +0530 | [diff] [blame] | 900 | DBG(cdev, "send_file_work returning %d state:%d\n", r, dev->state); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 901 | /* write the result */ |
| 902 | dev->xfer_result = r; |
| 903 | smp_wmb(); |
| 904 | } |
| 905 | |
| 906 | /* read from USB and write to a local file */ |
| 907 | static void receive_file_work(struct work_struct *data) |
| 908 | { |
| 909 | struct mtp_dev *dev = container_of(data, struct mtp_dev, |
| 910 | receive_file_work); |
| 911 | struct usb_composite_dev *cdev = dev->cdev; |
| 912 | struct usb_request *read_req = NULL, *write_req = NULL; |
| 913 | struct file *filp; |
| 914 | loff_t offset; |
| 915 | int64_t count; |
| 916 | int ret, cur_buf = 0; |
| 917 | int r = 0; |
Hemant Kumar | fc2b8f0 | 2016-05-02 11:18:48 -0700 | [diff] [blame] | 918 | ktime_t start_time; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 919 | |
| 920 | /* read our parameters */ |
| 921 | smp_rmb(); |
| 922 | filp = dev->xfer_file; |
| 923 | offset = dev->xfer_file_offset; |
| 924 | count = dev->xfer_file_length; |
| 925 | |
| 926 | DBG(cdev, "receive_file_work(%lld)\n", count); |
Manu Gautam | 0caf908 | 2012-10-03 18:49:33 +0530 | [diff] [blame] | 927 | if (!IS_ALIGNED(count, dev->ep_out->maxpacket)) |
| 928 | DBG(cdev, "%s- count(%lld) not multiple of mtu(%d)\n", __func__, |
| 929 | count, dev->ep_out->maxpacket); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 930 | |
| 931 | while (count > 0 || write_req) { |
| 932 | if (count > 0) { |
Vijayavardhan Vennapusa | b28d3e8 | 2017-02-16 15:22:14 +0530 | [diff] [blame] | 933 | mutex_lock(&dev->read_mutex); |
| 934 | if (dev->state == STATE_OFFLINE) { |
| 935 | r = -EIO; |
| 936 | mutex_unlock(&dev->read_mutex); |
| 937 | break; |
| 938 | } |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 939 | /* queue a request */ |
| 940 | read_req = dev->rx_req[cur_buf]; |
| 941 | cur_buf = (cur_buf + 1) % RX_REQ_MAX; |
| 942 | |
Manu Gautam | 0caf908 | 2012-10-03 18:49:33 +0530 | [diff] [blame] | 943 | /* some h/w expects size to be aligned to ep's MTU */ |
Hemant Kumar | 4aed14e | 2016-05-01 17:35:36 -0700 | [diff] [blame] | 944 | read_req->length = mtp_rx_req_len; |
Manu Gautam | 0caf908 | 2012-10-03 18:49:33 +0530 | [diff] [blame] | 945 | |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 946 | dev->rx_done = 0; |
Vijayavardhan Vennapusa | b28d3e8 | 2017-02-16 15:22:14 +0530 | [diff] [blame] | 947 | mutex_unlock(&dev->read_mutex); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 948 | ret = usb_ep_queue(dev->ep_out, read_req, GFP_KERNEL); |
| 949 | if (ret < 0) { |
| 950 | r = -EIO; |
Hemant Kumar | 9bcbf7b | 2016-05-01 22:15:04 -0700 | [diff] [blame] | 951 | if (dev->state != STATE_OFFLINE) |
| 952 | dev->state = STATE_ERROR; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 953 | break; |
| 954 | } |
| 955 | } |
| 956 | |
| 957 | if (write_req) { |
Chandana Kishori Chiluveru | 7f5670a | 2017-10-28 23:05:45 +0530 | [diff] [blame] | 958 | DBG(cdev, "rx %pK %d\n", write_req, write_req->actual); |
Hemant Kumar | fc2b8f0 | 2016-05-02 11:18:48 -0700 | [diff] [blame] | 959 | start_time = ktime_get(); |
Vijayavardhan Vennapusa | b28d3e8 | 2017-02-16 15:22:14 +0530 | [diff] [blame] | 960 | mutex_lock(&dev->read_mutex); |
| 961 | if (dev->state == STATE_OFFLINE) { |
| 962 | r = -EIO; |
| 963 | mutex_unlock(&dev->read_mutex); |
| 964 | break; |
| 965 | } |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 966 | ret = vfs_write(filp, write_req->buf, write_req->actual, |
| 967 | &offset); |
| 968 | DBG(cdev, "vfs_write %d\n", ret); |
| 969 | if (ret != write_req->actual) { |
| 970 | r = -EIO; |
Vijayavardhan Vennapusa | b28d3e8 | 2017-02-16 15:22:14 +0530 | [diff] [blame] | 971 | mutex_unlock(&dev->read_mutex); |
Hemant Kumar | 9bcbf7b | 2016-05-01 22:15:04 -0700 | [diff] [blame] | 972 | if (dev->state != STATE_OFFLINE) |
| 973 | dev->state = STATE_ERROR; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 974 | break; |
| 975 | } |
Vijayavardhan Vennapusa | b28d3e8 | 2017-02-16 15:22:14 +0530 | [diff] [blame] | 976 | mutex_unlock(&dev->read_mutex); |
Hemant Kumar | fc2b8f0 | 2016-05-02 11:18:48 -0700 | [diff] [blame] | 977 | dev->perf[dev->dbg_write_index].vfs_wtime = |
| 978 | ktime_to_us(ktime_sub(ktime_get(), start_time)); |
| 979 | dev->perf[dev->dbg_write_index].vfs_wbytes = ret; |
| 980 | dev->dbg_write_index = |
| 981 | (dev->dbg_write_index + 1) % MAX_ITERATION; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 982 | write_req = NULL; |
| 983 | } |
| 984 | |
| 985 | if (read_req) { |
| 986 | /* wait for our last read to complete */ |
| 987 | ret = wait_event_interruptible(dev->read_wq, |
| 988 | dev->rx_done || dev->state != STATE_BUSY); |
Hemant Kumar | 1597fd6 | 2016-05-01 22:22:35 -0700 | [diff] [blame] | 989 | if (dev->state == STATE_CANCELED |
| 990 | || dev->state == STATE_OFFLINE) { |
Hemant Kumar | e3fe674 | 2016-05-02 10:50:35 -0700 | [diff] [blame] | 991 | if (dev->state == STATE_OFFLINE) |
| 992 | r = -EIO; |
| 993 | else |
| 994 | r = -ECANCELED; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 995 | if (!dev->rx_done) |
| 996 | usb_ep_dequeue(dev->ep_out, read_req); |
| 997 | break; |
| 998 | } |
Manu Gautam | 0caf908 | 2012-10-03 18:49:33 +0530 | [diff] [blame] | 999 | |
Jiebing Li | df5d320 | 2015-03-10 11:27:10 +0800 | [diff] [blame] | 1000 | if (read_req->status) { |
| 1001 | r = read_req->status; |
| 1002 | break; |
| 1003 | } |
Vijayavardhan Vennapusa | b28d3e8 | 2017-02-16 15:22:14 +0530 | [diff] [blame] | 1004 | |
| 1005 | mutex_lock(&dev->read_mutex); |
| 1006 | if (dev->state == STATE_OFFLINE) { |
| 1007 | r = -EIO; |
| 1008 | mutex_unlock(&dev->read_mutex); |
| 1009 | break; |
| 1010 | } |
Manu Gautam | 0caf908 | 2012-10-03 18:49:33 +0530 | [diff] [blame] | 1011 | /* Check if we aligned the size due to MTU constraint */ |
| 1012 | if (count < read_req->length) |
| 1013 | read_req->actual = (read_req->actual > count ? |
| 1014 | count : read_req->actual); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1015 | /* if xfer_file_length is 0xFFFFFFFF, then we read until |
| 1016 | * we get a zero length packet |
| 1017 | */ |
| 1018 | if (count != 0xFFFFFFFF) |
| 1019 | count -= read_req->actual; |
| 1020 | if (read_req->actual < read_req->length) { |
| 1021 | /* |
| 1022 | * short packet is used to signal EOF for |
| 1023 | * sizes > 4 gig |
| 1024 | */ |
| 1025 | DBG(cdev, "got short packet\n"); |
| 1026 | count = 0; |
| 1027 | } |
| 1028 | |
| 1029 | write_req = read_req; |
| 1030 | read_req = NULL; |
Vijayavardhan Vennapusa | b28d3e8 | 2017-02-16 15:22:14 +0530 | [diff] [blame] | 1031 | mutex_unlock(&dev->read_mutex); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1032 | } |
| 1033 | } |
| 1034 | |
| 1035 | DBG(cdev, "receive_file_work returning %d\n", r); |
| 1036 | /* write the result */ |
| 1037 | dev->xfer_result = r; |
| 1038 | smp_wmb(); |
| 1039 | } |
| 1040 | |
| 1041 | static int mtp_send_event(struct mtp_dev *dev, struct mtp_event *event) |
| 1042 | { |
| 1043 | struct usb_request *req = NULL; |
| 1044 | int ret; |
| 1045 | int length = event->length; |
| 1046 | |
Greg Hackmann | 3a725f4 | 2014-02-24 10:19:13 -0800 | [diff] [blame] | 1047 | DBG(dev->cdev, "mtp_send_event(%zu)\n", event->length); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1048 | |
| 1049 | if (length < 0 || length > INTR_BUFFER_SIZE) |
| 1050 | return -EINVAL; |
| 1051 | if (dev->state == STATE_OFFLINE) |
| 1052 | return -ENODEV; |
| 1053 | |
| 1054 | ret = wait_event_interruptible_timeout(dev->intr_wq, |
| 1055 | (req = mtp_req_get(dev, &dev->intr_idle)), |
| 1056 | msecs_to_jiffies(1000)); |
| 1057 | if (!req) |
| 1058 | return -ETIME; |
| 1059 | |
| 1060 | if (copy_from_user(req->buf, (void __user *)event->data, length)) { |
| 1061 | mtp_req_put(dev, &dev->intr_idle, req); |
| 1062 | return -EFAULT; |
| 1063 | } |
| 1064 | req->length = length; |
| 1065 | ret = usb_ep_queue(dev->ep_intr, req, GFP_KERNEL); |
| 1066 | if (ret) |
| 1067 | mtp_req_put(dev, &dev->intr_idle, req); |
| 1068 | |
| 1069 | return ret; |
| 1070 | } |
| 1071 | |
Hemant Kumar | 83d6a26 | 2016-05-02 10:57:12 -0700 | [diff] [blame] | 1072 | static long mtp_send_receive_ioctl(struct file *fp, unsigned int code, |
| 1073 | struct mtp_file_range *mfr) |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1074 | { |
| 1075 | struct mtp_dev *dev = fp->private_data; |
| 1076 | struct file *filp = NULL; |
Hemant Kumar | 83d6a26 | 2016-05-02 10:57:12 -0700 | [diff] [blame] | 1077 | struct work_struct *work; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1078 | int ret = -EINVAL; |
| 1079 | |
ChandanaKishori Chiluveru | 9a7474a | 2015-11-13 11:25:52 +0530 | [diff] [blame] | 1080 | if (mtp_lock(&dev->ioctl_excl)) { |
| 1081 | DBG(dev->cdev, "ioctl returning EBUSY state:%d\n", dev->state); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1082 | return -EBUSY; |
ChandanaKishori Chiluveru | 9a7474a | 2015-11-13 11:25:52 +0530 | [diff] [blame] | 1083 | } |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1084 | |
Hemant Kumar | 83d6a26 | 2016-05-02 10:57:12 -0700 | [diff] [blame] | 1085 | spin_lock_irq(&dev->lock); |
| 1086 | if (dev->state == STATE_CANCELED) { |
| 1087 | /* report cancellation to userspace */ |
| 1088 | dev->state = STATE_READY; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1089 | spin_unlock_irq(&dev->lock); |
Hemant Kumar | 83d6a26 | 2016-05-02 10:57:12 -0700 | [diff] [blame] | 1090 | ret = -ECANCELED; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1091 | goto out; |
| 1092 | } |
Hemant Kumar | 83d6a26 | 2016-05-02 10:57:12 -0700 | [diff] [blame] | 1093 | if (dev->state == STATE_OFFLINE) { |
| 1094 | spin_unlock_irq(&dev->lock); |
| 1095 | ret = -ENODEV; |
| 1096 | goto out; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1097 | } |
Hemant Kumar | 83d6a26 | 2016-05-02 10:57:12 -0700 | [diff] [blame] | 1098 | dev->state = STATE_BUSY; |
| 1099 | spin_unlock_irq(&dev->lock); |
| 1100 | |
| 1101 | /* hold a reference to the file while we are working with it */ |
| 1102 | filp = fget(mfr->fd); |
| 1103 | if (!filp) { |
| 1104 | ret = -EBADF; |
| 1105 | goto fail; |
| 1106 | } |
| 1107 | |
| 1108 | /* write the parameters */ |
| 1109 | dev->xfer_file = filp; |
| 1110 | dev->xfer_file_offset = mfr->offset; |
| 1111 | dev->xfer_file_length = mfr->length; |
| 1112 | /* make sure write is done before parameters are read */ |
| 1113 | smp_wmb(); |
| 1114 | |
| 1115 | if (code == MTP_SEND_FILE_WITH_HEADER) { |
| 1116 | work = &dev->send_file_work; |
| 1117 | dev->xfer_send_header = 1; |
| 1118 | dev->xfer_command = mfr->command; |
| 1119 | dev->xfer_transaction_id = mfr->transaction_id; |
| 1120 | } else if (code == MTP_SEND_FILE) { |
| 1121 | work = &dev->send_file_work; |
| 1122 | dev->xfer_send_header = 0; |
| 1123 | } else { |
| 1124 | work = &dev->receive_file_work; |
| 1125 | } |
| 1126 | |
| 1127 | /* We do the file transfer on a work queue so it will run |
| 1128 | * in kernel context, which is necessary for vfs_read and |
| 1129 | * vfs_write to use our buffers in the kernel address space. |
| 1130 | */ |
| 1131 | queue_work(dev->wq, work); |
| 1132 | /* wait for operation to complete */ |
| 1133 | flush_workqueue(dev->wq); |
| 1134 | fput(filp); |
| 1135 | |
| 1136 | /* read the result */ |
| 1137 | smp_rmb(); |
| 1138 | ret = dev->xfer_result; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1139 | |
| 1140 | fail: |
| 1141 | spin_lock_irq(&dev->lock); |
| 1142 | if (dev->state == STATE_CANCELED) |
| 1143 | ret = -ECANCELED; |
| 1144 | else if (dev->state != STATE_OFFLINE) |
| 1145 | dev->state = STATE_READY; |
| 1146 | spin_unlock_irq(&dev->lock); |
| 1147 | out: |
| 1148 | mtp_unlock(&dev->ioctl_excl); |
ChandanaKishori Chiluveru | 9a7474a | 2015-11-13 11:25:52 +0530 | [diff] [blame] | 1149 | DBG(dev->cdev, "ioctl returning %d state:%d\n", ret, dev->state); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1150 | return ret; |
| 1151 | } |
| 1152 | |
Hemant Kumar | 83d6a26 | 2016-05-02 10:57:12 -0700 | [diff] [blame] | 1153 | static long mtp_ioctl(struct file *fp, unsigned int code, unsigned long value) |
| 1154 | { |
| 1155 | struct mtp_dev *dev = fp->private_data; |
| 1156 | struct mtp_file_range mfr; |
| 1157 | struct mtp_event event; |
| 1158 | int ret = -EINVAL; |
| 1159 | |
| 1160 | switch (code) { |
| 1161 | case MTP_SEND_FILE: |
| 1162 | case MTP_RECEIVE_FILE: |
| 1163 | case MTP_SEND_FILE_WITH_HEADER: |
| 1164 | if (copy_from_user(&mfr, (void __user *)value, sizeof(mfr))) { |
| 1165 | ret = -EFAULT; |
| 1166 | goto fail; |
| 1167 | } |
| 1168 | ret = mtp_send_receive_ioctl(fp, code, &mfr); |
| 1169 | break; |
| 1170 | case MTP_SEND_EVENT: |
| 1171 | if (mtp_lock(&dev->ioctl_excl)) |
| 1172 | return -EBUSY; |
| 1173 | /* return here so we don't change dev->state below, |
| 1174 | * which would interfere with bulk transfer state. |
| 1175 | */ |
| 1176 | if (copy_from_user(&event, (void __user *)value, sizeof(event))) |
| 1177 | ret = -EFAULT; |
| 1178 | else |
| 1179 | ret = mtp_send_event(dev, &event); |
| 1180 | mtp_unlock(&dev->ioctl_excl); |
| 1181 | break; |
| 1182 | default: |
| 1183 | DBG(dev->cdev, "unknown ioctl code: %d\n", code); |
| 1184 | } |
| 1185 | fail: |
| 1186 | return ret; |
| 1187 | } |
| 1188 | |
| 1189 | /* |
| 1190 | * 32 bit userspace calling into 64 bit kernel. handle ioctl code |
| 1191 | * and userspace pointer |
| 1192 | */ |
| 1193 | #ifdef CONFIG_COMPAT |
| 1194 | static long compat_mtp_ioctl(struct file *fp, unsigned int code, |
| 1195 | unsigned long value) |
| 1196 | { |
| 1197 | struct mtp_dev *dev = fp->private_data; |
| 1198 | struct mtp_file_range mfr; |
| 1199 | struct __compat_mtp_file_range cmfr; |
| 1200 | struct mtp_event event; |
| 1201 | struct __compat_mtp_event cevent; |
| 1202 | unsigned int cmd; |
| 1203 | bool send_file = false; |
| 1204 | int ret = -EINVAL; |
| 1205 | |
| 1206 | switch (code) { |
| 1207 | case COMPAT_MTP_SEND_FILE: |
| 1208 | cmd = MTP_SEND_FILE; |
| 1209 | send_file = true; |
| 1210 | break; |
| 1211 | case COMPAT_MTP_RECEIVE_FILE: |
| 1212 | cmd = MTP_RECEIVE_FILE; |
| 1213 | send_file = true; |
| 1214 | break; |
| 1215 | case COMPAT_MTP_SEND_FILE_WITH_HEADER: |
| 1216 | cmd = MTP_SEND_FILE_WITH_HEADER; |
| 1217 | send_file = true; |
| 1218 | break; |
| 1219 | case COMPAT_MTP_SEND_EVENT: |
| 1220 | cmd = MTP_SEND_EVENT; |
| 1221 | break; |
| 1222 | default: |
| 1223 | DBG(dev->cdev, "unknown compat_ioctl code: %d\n", code); |
| 1224 | ret = -ENOIOCTLCMD; |
| 1225 | goto fail; |
| 1226 | } |
| 1227 | |
| 1228 | if (send_file) { |
| 1229 | if (copy_from_user(&cmfr, (void __user *)value, sizeof(cmfr))) { |
| 1230 | ret = -EFAULT; |
| 1231 | goto fail; |
| 1232 | } |
| 1233 | mfr.fd = cmfr.fd; |
| 1234 | mfr.offset = cmfr.offset; |
| 1235 | mfr.length = cmfr.length; |
| 1236 | mfr.command = cmfr.command; |
| 1237 | mfr.transaction_id = cmfr.transaction_id; |
| 1238 | ret = mtp_send_receive_ioctl(fp, cmd, &mfr); |
| 1239 | } else { |
| 1240 | if (mtp_lock(&dev->ioctl_excl)) |
| 1241 | return -EBUSY; |
| 1242 | /* return here so we don't change dev->state below, |
| 1243 | * which would interfere with bulk transfer state. |
| 1244 | */ |
| 1245 | if (copy_from_user(&cevent, (void __user *)value, |
| 1246 | sizeof(cevent))) { |
| 1247 | ret = -EFAULT; |
| 1248 | goto fail; |
| 1249 | } |
| 1250 | event.length = cevent.length; |
| 1251 | event.data = compat_ptr(cevent.data); |
| 1252 | ret = mtp_send_event(dev, &event); |
| 1253 | mtp_unlock(&dev->ioctl_excl); |
| 1254 | } |
| 1255 | fail: |
| 1256 | return ret; |
| 1257 | } |
| 1258 | #endif |
| 1259 | |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1260 | static int mtp_open(struct inode *ip, struct file *fp) |
| 1261 | { |
| 1262 | printk(KERN_INFO "mtp_open\n"); |
ChandanaKishori Chiluveru | 9a7474a | 2015-11-13 11:25:52 +0530 | [diff] [blame] | 1263 | if (mtp_lock(&_mtp_dev->open_excl)) { |
| 1264 | pr_err("%s mtp_release not called returning EBUSY\n", __func__); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1265 | return -EBUSY; |
ChandanaKishori Chiluveru | 9a7474a | 2015-11-13 11:25:52 +0530 | [diff] [blame] | 1266 | } |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1267 | |
| 1268 | /* clear any error condition */ |
| 1269 | if (_mtp_dev->state != STATE_OFFLINE) |
| 1270 | _mtp_dev->state = STATE_READY; |
| 1271 | |
| 1272 | fp->private_data = _mtp_dev; |
| 1273 | return 0; |
| 1274 | } |
| 1275 | |
| 1276 | static int mtp_release(struct inode *ip, struct file *fp) |
| 1277 | { |
| 1278 | printk(KERN_INFO "mtp_release\n"); |
| 1279 | |
| 1280 | mtp_unlock(&_mtp_dev->open_excl); |
| 1281 | return 0; |
| 1282 | } |
| 1283 | |
| 1284 | /* file operations for /dev/mtp_usb */ |
| 1285 | static const struct file_operations mtp_fops = { |
| 1286 | .owner = THIS_MODULE, |
| 1287 | .read = mtp_read, |
| 1288 | .write = mtp_write, |
| 1289 | .unlocked_ioctl = mtp_ioctl, |
Hemant Kumar | 83d6a26 | 2016-05-02 10:57:12 -0700 | [diff] [blame] | 1290 | #ifdef CONFIG_COMPAT |
| 1291 | .compat_ioctl = compat_mtp_ioctl, |
| 1292 | #endif |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1293 | .open = mtp_open, |
| 1294 | .release = mtp_release, |
| 1295 | }; |
| 1296 | |
| 1297 | static struct miscdevice mtp_device = { |
| 1298 | .minor = MISC_DYNAMIC_MINOR, |
| 1299 | .name = mtp_shortname, |
| 1300 | .fops = &mtp_fops, |
| 1301 | }; |
| 1302 | |
| 1303 | static int mtp_ctrlrequest(struct usb_composite_dev *cdev, |
| 1304 | const struct usb_ctrlrequest *ctrl) |
| 1305 | { |
| 1306 | struct mtp_dev *dev = _mtp_dev; |
| 1307 | int value = -EOPNOTSUPP; |
| 1308 | u16 w_index = le16_to_cpu(ctrl->wIndex); |
| 1309 | u16 w_value = le16_to_cpu(ctrl->wValue); |
| 1310 | u16 w_length = le16_to_cpu(ctrl->wLength); |
| 1311 | unsigned long flags; |
| 1312 | |
| 1313 | VDBG(cdev, "mtp_ctrlrequest " |
| 1314 | "%02x.%02x v%04x i%04x l%u\n", |
| 1315 | ctrl->bRequestType, ctrl->bRequest, |
| 1316 | w_value, w_index, w_length); |
| 1317 | |
| 1318 | /* Handle MTP OS string */ |
| 1319 | if (ctrl->bRequestType == |
| 1320 | (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE) |
| 1321 | && ctrl->bRequest == USB_REQ_GET_DESCRIPTOR |
| 1322 | && (w_value >> 8) == USB_DT_STRING |
| 1323 | && (w_value & 0xFF) == MTP_OS_STRING_ID) { |
| 1324 | value = (w_length < sizeof(mtp_os_string) |
| 1325 | ? w_length : sizeof(mtp_os_string)); |
| 1326 | memcpy(cdev->req->buf, mtp_os_string, value); |
| 1327 | } else if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR) { |
| 1328 | /* Handle MTP OS descriptor */ |
| 1329 | DBG(cdev, "vendor request: %d index: %d value: %d length: %d\n", |
| 1330 | ctrl->bRequest, w_index, w_value, w_length); |
| 1331 | |
| 1332 | if (ctrl->bRequest == 1 |
| 1333 | && (ctrl->bRequestType & USB_DIR_IN) |
| 1334 | && (w_index == 4 || w_index == 5)) { |
| 1335 | value = (w_length < sizeof(mtp_ext_config_desc) ? |
| 1336 | w_length : sizeof(mtp_ext_config_desc)); |
| 1337 | memcpy(cdev->req->buf, &mtp_ext_config_desc, value); |
Jack Pham | 5043924 | 2017-02-07 11:48:25 -0800 | [diff] [blame] | 1338 | |
| 1339 | /* update compatibleID if PTP */ |
| 1340 | if (dev->function.fs_descriptors == fs_ptp_descs) { |
| 1341 | struct mtp_ext_config_desc *d = cdev->req->buf; |
| 1342 | |
| 1343 | d->function.compatibleID[0] = 'P'; |
| 1344 | } |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1345 | } |
| 1346 | } else if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) { |
| 1347 | DBG(cdev, "class request: %d index: %d value: %d length: %d\n", |
| 1348 | ctrl->bRequest, w_index, w_value, w_length); |
| 1349 | |
| 1350 | if (ctrl->bRequest == MTP_REQ_CANCEL && w_index == 0 |
| 1351 | && w_value == 0) { |
| 1352 | DBG(cdev, "MTP_REQ_CANCEL\n"); |
| 1353 | |
| 1354 | spin_lock_irqsave(&dev->lock, flags); |
| 1355 | if (dev->state == STATE_BUSY) { |
| 1356 | dev->state = STATE_CANCELED; |
| 1357 | wake_up(&dev->read_wq); |
| 1358 | wake_up(&dev->write_wq); |
| 1359 | } |
| 1360 | spin_unlock_irqrestore(&dev->lock, flags); |
| 1361 | |
| 1362 | /* We need to queue a request to read the remaining |
| 1363 | * bytes, but we don't actually need to look at |
| 1364 | * the contents. |
| 1365 | */ |
| 1366 | value = w_length; |
| 1367 | } else if (ctrl->bRequest == MTP_REQ_GET_DEVICE_STATUS |
| 1368 | && w_index == 0 && w_value == 0) { |
| 1369 | struct mtp_device_status *status = cdev->req->buf; |
Anson Jacob | 051584e | 2016-11-11 01:10:04 -0500 | [diff] [blame] | 1370 | |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1371 | status->wLength = |
| 1372 | __constant_cpu_to_le16(sizeof(*status)); |
| 1373 | |
| 1374 | DBG(cdev, "MTP_REQ_GET_DEVICE_STATUS\n"); |
| 1375 | spin_lock_irqsave(&dev->lock, flags); |
| 1376 | /* device status is "busy" until we report |
| 1377 | * the cancelation to userspace |
| 1378 | */ |
| 1379 | if (dev->state == STATE_CANCELED) |
| 1380 | status->wCode = |
| 1381 | __cpu_to_le16(MTP_RESPONSE_DEVICE_BUSY); |
| 1382 | else |
| 1383 | status->wCode = |
| 1384 | __cpu_to_le16(MTP_RESPONSE_OK); |
| 1385 | spin_unlock_irqrestore(&dev->lock, flags); |
| 1386 | value = sizeof(*status); |
| 1387 | } |
| 1388 | } |
| 1389 | |
| 1390 | /* respond with data transfer or status phase? */ |
| 1391 | if (value >= 0) { |
| 1392 | int rc; |
Anson Jacob | 051584e | 2016-11-11 01:10:04 -0500 | [diff] [blame] | 1393 | |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1394 | cdev->req->zero = value < w_length; |
| 1395 | cdev->req->length = value; |
| 1396 | rc = usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC); |
| 1397 | if (rc < 0) |
| 1398 | ERROR(cdev, "%s: response queue error\n", __func__); |
| 1399 | } |
| 1400 | return value; |
| 1401 | } |
| 1402 | |
| 1403 | static int |
| 1404 | mtp_function_bind(struct usb_configuration *c, struct usb_function *f) |
| 1405 | { |
| 1406 | struct usb_composite_dev *cdev = c->cdev; |
| 1407 | struct mtp_dev *dev = func_to_mtp(f); |
| 1408 | int id; |
| 1409 | int ret; |
Badhri Jagan Sridharan | 5485646 | 2015-10-06 20:32:01 -0700 | [diff] [blame] | 1410 | struct mtp_instance *fi_mtp; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1411 | |
| 1412 | dev->cdev = cdev; |
Chandana Kishori Chiluveru | 7f5670a | 2017-10-28 23:05:45 +0530 | [diff] [blame] | 1413 | DBG(cdev, "mtp_function_bind dev: %pK\n", dev); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1414 | |
| 1415 | /* allocate interface ID(s) */ |
| 1416 | id = usb_interface_id(c, f); |
| 1417 | if (id < 0) |
| 1418 | return id; |
| 1419 | mtp_interface_desc.bInterfaceNumber = id; |
| 1420 | |
Badhri Jagan Sridharan | f545f54 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1421 | if (mtp_string_defs[INTERFACE_STRING_INDEX].id == 0) { |
| 1422 | ret = usb_string_id(c->cdev); |
| 1423 | if (ret < 0) |
| 1424 | return ret; |
| 1425 | mtp_string_defs[INTERFACE_STRING_INDEX].id = ret; |
| 1426 | mtp_interface_desc.iInterface = ret; |
| 1427 | } |
Badhri Jagan Sridharan | 5485646 | 2015-10-06 20:32:01 -0700 | [diff] [blame] | 1428 | |
| 1429 | fi_mtp = container_of(f->fi, struct mtp_instance, func_inst); |
| 1430 | |
| 1431 | if (cdev->use_os_string) { |
| 1432 | f->os_desc_table = kzalloc(sizeof(*f->os_desc_table), |
| 1433 | GFP_KERNEL); |
| 1434 | if (!f->os_desc_table) |
| 1435 | return -ENOMEM; |
| 1436 | f->os_desc_n = 1; |
| 1437 | f->os_desc_table[0].os_desc = &fi_mtp->mtp_os_desc; |
| 1438 | } |
| 1439 | |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1440 | /* allocate endpoints */ |
| 1441 | ret = mtp_create_bulk_endpoints(dev, &mtp_fullspeed_in_desc, |
| 1442 | &mtp_fullspeed_out_desc, &mtp_intr_desc); |
| 1443 | if (ret) |
| 1444 | return ret; |
| 1445 | |
| 1446 | /* support high speed hardware */ |
| 1447 | if (gadget_is_dualspeed(c->cdev->gadget)) { |
| 1448 | mtp_highspeed_in_desc.bEndpointAddress = |
| 1449 | mtp_fullspeed_in_desc.bEndpointAddress; |
| 1450 | mtp_highspeed_out_desc.bEndpointAddress = |
| 1451 | mtp_fullspeed_out_desc.bEndpointAddress; |
| 1452 | } |
Mark Kuo | 1b61b27 | 2015-08-20 13:01:46 +0800 | [diff] [blame] | 1453 | /* support super speed hardware */ |
| 1454 | if (gadget_is_superspeed(c->cdev->gadget)) { |
| 1455 | unsigned max_burst; |
| 1456 | |
| 1457 | /* Calculate bMaxBurst, we know packet size is 1024 */ |
| 1458 | max_burst = min_t(unsigned, MTP_BULK_BUFFER_SIZE / 1024, 15); |
| 1459 | mtp_ss_in_desc.bEndpointAddress = |
| 1460 | mtp_fullspeed_in_desc.bEndpointAddress; |
| 1461 | mtp_ss_in_comp_desc.bMaxBurst = max_burst; |
| 1462 | mtp_ss_out_desc.bEndpointAddress = |
| 1463 | mtp_fullspeed_out_desc.bEndpointAddress; |
| 1464 | mtp_ss_out_comp_desc.bMaxBurst = max_burst; |
| 1465 | } |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1466 | |
Pratham Pratap | d88fbcd | 2017-12-06 16:47:10 +0530 | [diff] [blame] | 1467 | fi_mtp->func_inst.f = &dev->function; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1468 | DBG(cdev, "%s speed %s: IN/%s, OUT/%s\n", |
Mark Kuo | 1b61b27 | 2015-08-20 13:01:46 +0800 | [diff] [blame] | 1469 | gadget_is_superspeed(c->cdev->gadget) ? "super" : |
| 1470 | (gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full"), |
| 1471 | f->name, dev->ep_in->name, dev->ep_out->name); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1472 | return 0; |
| 1473 | } |
| 1474 | |
| 1475 | static void |
| 1476 | mtp_function_unbind(struct usb_configuration *c, struct usb_function *f) |
| 1477 | { |
| 1478 | struct mtp_dev *dev = func_to_mtp(f); |
Pratham Pratap | d88fbcd | 2017-12-06 16:47:10 +0530 | [diff] [blame] | 1479 | struct mtp_instance *fi_mtp; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1480 | struct usb_request *req; |
| 1481 | int i; |
Pratham Pratap | d88fbcd | 2017-12-06 16:47:10 +0530 | [diff] [blame] | 1482 | fi_mtp = container_of(f->fi, struct mtp_instance, func_inst); |
Mayank Rana | 9ce075b | 2017-03-28 15:17:03 -0700 | [diff] [blame] | 1483 | mtp_string_defs[INTERFACE_STRING_INDEX].id = 0; |
Vijayavardhan Vennapusa | b28d3e8 | 2017-02-16 15:22:14 +0530 | [diff] [blame] | 1484 | mutex_lock(&dev->read_mutex); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1485 | while ((req = mtp_req_get(dev, &dev->tx_idle))) |
| 1486 | mtp_request_free(req, dev->ep_in); |
| 1487 | for (i = 0; i < RX_REQ_MAX; i++) |
| 1488 | mtp_request_free(dev->rx_req[i], dev->ep_out); |
| 1489 | while ((req = mtp_req_get(dev, &dev->intr_idle))) |
| 1490 | mtp_request_free(req, dev->ep_intr); |
Vijayavardhan Vennapusa | b28d3e8 | 2017-02-16 15:22:14 +0530 | [diff] [blame] | 1491 | mutex_unlock(&dev->read_mutex); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1492 | dev->state = STATE_OFFLINE; |
Badhri Jagan Sridharan | 5485646 | 2015-10-06 20:32:01 -0700 | [diff] [blame] | 1493 | kfree(f->os_desc_table); |
| 1494 | f->os_desc_n = 0; |
Pratham Pratap | d88fbcd | 2017-12-06 16:47:10 +0530 | [diff] [blame] | 1495 | fi_mtp->func_inst.f = NULL; |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1496 | } |
| 1497 | |
| 1498 | static int mtp_function_set_alt(struct usb_function *f, |
| 1499 | unsigned intf, unsigned alt) |
| 1500 | { |
| 1501 | struct mtp_dev *dev = func_to_mtp(f); |
| 1502 | struct usb_composite_dev *cdev = f->config->cdev; |
| 1503 | int ret; |
| 1504 | |
| 1505 | DBG(cdev, "mtp_function_set_alt intf: %d alt: %d\n", intf, alt); |
| 1506 | |
| 1507 | ret = config_ep_by_speed(cdev->gadget, f, dev->ep_in); |
| 1508 | if (ret) |
| 1509 | return ret; |
| 1510 | |
| 1511 | ret = usb_ep_enable(dev->ep_in); |
| 1512 | if (ret) |
| 1513 | return ret; |
| 1514 | |
| 1515 | ret = config_ep_by_speed(cdev->gadget, f, dev->ep_out); |
| 1516 | if (ret) |
| 1517 | return ret; |
| 1518 | |
| 1519 | ret = usb_ep_enable(dev->ep_out); |
| 1520 | if (ret) { |
| 1521 | usb_ep_disable(dev->ep_in); |
| 1522 | return ret; |
| 1523 | } |
| 1524 | |
| 1525 | ret = config_ep_by_speed(cdev->gadget, f, dev->ep_intr); |
| 1526 | if (ret) |
| 1527 | return ret; |
| 1528 | |
| 1529 | ret = usb_ep_enable(dev->ep_intr); |
| 1530 | if (ret) { |
| 1531 | usb_ep_disable(dev->ep_out); |
| 1532 | usb_ep_disable(dev->ep_in); |
| 1533 | return ret; |
| 1534 | } |
| 1535 | dev->state = STATE_READY; |
| 1536 | |
| 1537 | /* readers may be blocked waiting for us to go online */ |
| 1538 | wake_up(&dev->read_wq); |
| 1539 | return 0; |
| 1540 | } |
| 1541 | |
| 1542 | static void mtp_function_disable(struct usb_function *f) |
| 1543 | { |
| 1544 | struct mtp_dev *dev = func_to_mtp(f); |
| 1545 | struct usb_composite_dev *cdev = dev->cdev; |
| 1546 | |
| 1547 | DBG(cdev, "mtp_function_disable\n"); |
| 1548 | dev->state = STATE_OFFLINE; |
| 1549 | usb_ep_disable(dev->ep_in); |
| 1550 | usb_ep_disable(dev->ep_out); |
| 1551 | usb_ep_disable(dev->ep_intr); |
| 1552 | |
| 1553 | /* readers may be blocked waiting for us to go online */ |
| 1554 | wake_up(&dev->read_wq); |
| 1555 | |
| 1556 | VDBG(cdev, "%s disabled\n", dev->function.name); |
| 1557 | } |
| 1558 | |
Hemant Kumar | fc2b8f0 | 2016-05-02 11:18:48 -0700 | [diff] [blame] | 1559 | static int debug_mtp_read_stats(struct seq_file *s, void *unused) |
| 1560 | { |
| 1561 | struct mtp_dev *dev = _mtp_dev; |
| 1562 | int i; |
| 1563 | unsigned long flags; |
| 1564 | unsigned int min, max = 0, sum = 0, iteration = 0; |
| 1565 | |
| 1566 | seq_puts(s, "\n=======================\n"); |
| 1567 | seq_puts(s, "USB MTP OUT related VFS write stats:\n"); |
| 1568 | seq_puts(s, "\n=======================\n"); |
| 1569 | spin_lock_irqsave(&dev->lock, flags); |
| 1570 | min = dev->perf[0].vfs_wtime; |
| 1571 | for (i = 0; i < MAX_ITERATION; i++) { |
| 1572 | seq_printf(s, "vfs write: bytes:%ld\t\t time:%d\n", |
| 1573 | dev->perf[i].vfs_wbytes, |
| 1574 | dev->perf[i].vfs_wtime); |
| 1575 | if (dev->perf[i].vfs_wbytes == mtp_rx_req_len) { |
| 1576 | sum += dev->perf[i].vfs_wtime; |
| 1577 | if (min > dev->perf[i].vfs_wtime) |
| 1578 | min = dev->perf[i].vfs_wtime; |
| 1579 | if (max < dev->perf[i].vfs_wtime) |
| 1580 | max = dev->perf[i].vfs_wtime; |
| 1581 | iteration++; |
| 1582 | } |
| 1583 | } |
| 1584 | |
| 1585 | seq_printf(s, "vfs_write(time in usec) min:%d\t max:%d\t avg:%d\n", |
Ajay Agarwal | 579c3f3 | 2017-06-13 10:59:17 +0530 | [diff] [blame] | 1586 | min, max, (iteration ? (sum / iteration) : 0)); |
Hemant Kumar | fc2b8f0 | 2016-05-02 11:18:48 -0700 | [diff] [blame] | 1587 | min = max = sum = iteration = 0; |
| 1588 | seq_puts(s, "\n=======================\n"); |
| 1589 | seq_puts(s, "USB MTP IN related VFS read stats:\n"); |
| 1590 | seq_puts(s, "\n=======================\n"); |
| 1591 | |
| 1592 | min = dev->perf[0].vfs_rtime; |
| 1593 | for (i = 0; i < MAX_ITERATION; i++) { |
| 1594 | seq_printf(s, "vfs read: bytes:%ld\t\t time:%d\n", |
| 1595 | dev->perf[i].vfs_rbytes, |
| 1596 | dev->perf[i].vfs_rtime); |
| 1597 | if (dev->perf[i].vfs_rbytes == mtp_tx_req_len) { |
| 1598 | sum += dev->perf[i].vfs_rtime; |
| 1599 | if (min > dev->perf[i].vfs_rtime) |
| 1600 | min = dev->perf[i].vfs_rtime; |
| 1601 | if (max < dev->perf[i].vfs_rtime) |
| 1602 | max = dev->perf[i].vfs_rtime; |
| 1603 | iteration++; |
| 1604 | } |
| 1605 | } |
| 1606 | |
| 1607 | seq_printf(s, "vfs_read(time in usec) min:%d\t max:%d\t avg:%d\n", |
Ajay Agarwal | 579c3f3 | 2017-06-13 10:59:17 +0530 | [diff] [blame] | 1608 | min, max, (iteration ? (sum / iteration) : 0)); |
Hemant Kumar | fc2b8f0 | 2016-05-02 11:18:48 -0700 | [diff] [blame] | 1609 | spin_unlock_irqrestore(&dev->lock, flags); |
| 1610 | return 0; |
| 1611 | } |
| 1612 | |
| 1613 | static ssize_t debug_mtp_reset_stats(struct file *file, const char __user *buf, |
| 1614 | size_t count, loff_t *ppos) |
| 1615 | { |
| 1616 | int clear_stats; |
| 1617 | unsigned long flags; |
| 1618 | struct mtp_dev *dev = _mtp_dev; |
| 1619 | |
| 1620 | if (buf == NULL) { |
| 1621 | pr_err("[%s] EINVAL\n", __func__); |
| 1622 | goto done; |
| 1623 | } |
| 1624 | |
| 1625 | if (kstrtoint(buf, 0, &clear_stats) || clear_stats != 0) { |
| 1626 | pr_err("Wrong value. To clear stats, enter value as 0.\n"); |
| 1627 | goto done; |
| 1628 | } |
| 1629 | |
| 1630 | spin_lock_irqsave(&dev->lock, flags); |
| 1631 | memset(&dev->perf[0], 0, MAX_ITERATION * sizeof(dev->perf[0])); |
| 1632 | dev->dbg_read_index = 0; |
| 1633 | dev->dbg_write_index = 0; |
| 1634 | spin_unlock_irqrestore(&dev->lock, flags); |
| 1635 | done: |
| 1636 | return count; |
| 1637 | } |
| 1638 | |
| 1639 | static int debug_mtp_open(struct inode *inode, struct file *file) |
| 1640 | { |
| 1641 | return single_open(file, debug_mtp_read_stats, inode->i_private); |
| 1642 | } |
| 1643 | |
| 1644 | static const struct file_operations debug_mtp_ops = { |
| 1645 | .open = debug_mtp_open, |
| 1646 | .read = seq_read, |
| 1647 | .write = debug_mtp_reset_stats, |
| 1648 | }; |
| 1649 | |
| 1650 | struct dentry *dent_mtp; |
| 1651 | static void mtp_debugfs_init(void) |
| 1652 | { |
| 1653 | struct dentry *dent_mtp_status; |
| 1654 | |
| 1655 | dent_mtp = debugfs_create_dir("usb_mtp", 0); |
| 1656 | if (!dent_mtp || IS_ERR(dent_mtp)) |
| 1657 | return; |
| 1658 | |
| 1659 | dent_mtp_status = debugfs_create_file("status", 0644, dent_mtp, |
| 1660 | 0, &debug_mtp_ops); |
| 1661 | if (!dent_mtp_status || IS_ERR(dent_mtp_status)) { |
| 1662 | debugfs_remove(dent_mtp); |
| 1663 | dent_mtp = NULL; |
| 1664 | return; |
| 1665 | } |
| 1666 | } |
| 1667 | |
| 1668 | static void mtp_debugfs_remove(void) |
| 1669 | { |
| 1670 | debugfs_remove_recursive(dent_mtp); |
| 1671 | } |
| 1672 | |
Badhri Jagan Sridharan | f545f54 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1673 | static int __mtp_setup(struct mtp_instance *fi_mtp) |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1674 | { |
| 1675 | struct mtp_dev *dev; |
| 1676 | int ret; |
| 1677 | |
| 1678 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
Badhri Jagan Sridharan | f545f54 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1679 | |
| 1680 | if (fi_mtp != NULL) |
| 1681 | fi_mtp->dev = dev; |
| 1682 | |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1683 | if (!dev) |
| 1684 | return -ENOMEM; |
| 1685 | |
| 1686 | spin_lock_init(&dev->lock); |
| 1687 | init_waitqueue_head(&dev->read_wq); |
| 1688 | init_waitqueue_head(&dev->write_wq); |
| 1689 | init_waitqueue_head(&dev->intr_wq); |
| 1690 | atomic_set(&dev->open_excl, 0); |
| 1691 | atomic_set(&dev->ioctl_excl, 0); |
| 1692 | INIT_LIST_HEAD(&dev->tx_idle); |
| 1693 | INIT_LIST_HEAD(&dev->intr_idle); |
| 1694 | |
| 1695 | dev->wq = create_singlethread_workqueue("f_mtp"); |
| 1696 | if (!dev->wq) { |
| 1697 | ret = -ENOMEM; |
| 1698 | goto err1; |
| 1699 | } |
| 1700 | INIT_WORK(&dev->send_file_work, send_file_work); |
| 1701 | INIT_WORK(&dev->receive_file_work, receive_file_work); |
| 1702 | |
| 1703 | _mtp_dev = dev; |
| 1704 | |
| 1705 | ret = misc_register(&mtp_device); |
| 1706 | if (ret) |
| 1707 | goto err2; |
| 1708 | |
Hemant Kumar | fc2b8f0 | 2016-05-02 11:18:48 -0700 | [diff] [blame] | 1709 | mtp_debugfs_init(); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1710 | return 0; |
| 1711 | |
| 1712 | err2: |
| 1713 | destroy_workqueue(dev->wq); |
| 1714 | err1: |
| 1715 | _mtp_dev = NULL; |
| 1716 | kfree(dev); |
| 1717 | printk(KERN_ERR "mtp gadget driver failed to initialize\n"); |
| 1718 | return ret; |
| 1719 | } |
| 1720 | |
Badhri Jagan Sridharan | f545f54 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1721 | static int mtp_setup_configfs(struct mtp_instance *fi_mtp) |
| 1722 | { |
| 1723 | return __mtp_setup(fi_mtp); |
| 1724 | } |
| 1725 | |
| 1726 | |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1727 | static void mtp_cleanup(void) |
| 1728 | { |
| 1729 | struct mtp_dev *dev = _mtp_dev; |
| 1730 | |
| 1731 | if (!dev) |
| 1732 | return; |
| 1733 | |
Hemant Kumar | fc2b8f0 | 2016-05-02 11:18:48 -0700 | [diff] [blame] | 1734 | mtp_debugfs_remove(); |
Benoit Goby | 27d01e5 | 2011-12-19 14:37:50 -0800 | [diff] [blame] | 1735 | misc_deregister(&mtp_device); |
| 1736 | destroy_workqueue(dev->wq); |
| 1737 | _mtp_dev = NULL; |
| 1738 | kfree(dev); |
| 1739 | } |
Badhri Jagan Sridharan | f545f54 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1740 | |
| 1741 | static struct mtp_instance *to_mtp_instance(struct config_item *item) |
| 1742 | { |
| 1743 | return container_of(to_config_group(item), struct mtp_instance, |
| 1744 | func_inst.group); |
| 1745 | } |
| 1746 | |
| 1747 | static void mtp_attr_release(struct config_item *item) |
| 1748 | { |
| 1749 | struct mtp_instance *fi_mtp = to_mtp_instance(item); |
Anson Jacob | 051584e | 2016-11-11 01:10:04 -0500 | [diff] [blame] | 1750 | |
Badhri Jagan Sridharan | f545f54 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1751 | usb_put_function_instance(&fi_mtp->func_inst); |
| 1752 | } |
| 1753 | |
| 1754 | static struct configfs_item_operations mtp_item_ops = { |
| 1755 | .release = mtp_attr_release, |
| 1756 | }; |
| 1757 | |
| 1758 | static struct config_item_type mtp_func_type = { |
| 1759 | .ct_item_ops = &mtp_item_ops, |
| 1760 | .ct_owner = THIS_MODULE, |
| 1761 | }; |
| 1762 | |
| 1763 | |
| 1764 | static struct mtp_instance *to_fi_mtp(struct usb_function_instance *fi) |
| 1765 | { |
| 1766 | return container_of(fi, struct mtp_instance, func_inst); |
| 1767 | } |
| 1768 | |
| 1769 | static int mtp_set_inst_name(struct usb_function_instance *fi, const char *name) |
| 1770 | { |
| 1771 | struct mtp_instance *fi_mtp; |
| 1772 | char *ptr; |
| 1773 | int name_len; |
| 1774 | |
| 1775 | name_len = strlen(name) + 1; |
| 1776 | if (name_len > MAX_INST_NAME_LEN) |
| 1777 | return -ENAMETOOLONG; |
| 1778 | |
| 1779 | ptr = kstrndup(name, name_len, GFP_KERNEL); |
| 1780 | if (!ptr) |
| 1781 | return -ENOMEM; |
| 1782 | |
| 1783 | fi_mtp = to_fi_mtp(fi); |
| 1784 | fi_mtp->name = ptr; |
| 1785 | |
| 1786 | return 0; |
| 1787 | } |
| 1788 | |
| 1789 | static void mtp_free_inst(struct usb_function_instance *fi) |
| 1790 | { |
| 1791 | struct mtp_instance *fi_mtp; |
| 1792 | |
| 1793 | fi_mtp = to_fi_mtp(fi); |
| 1794 | kfree(fi_mtp->name); |
| 1795 | mtp_cleanup(); |
| 1796 | kfree(fi_mtp); |
| 1797 | } |
| 1798 | |
| 1799 | struct usb_function_instance *alloc_inst_mtp_ptp(bool mtp_config) |
| 1800 | { |
| 1801 | struct mtp_instance *fi_mtp; |
| 1802 | int ret = 0; |
Badhri Jagan Sridharan | 5485646 | 2015-10-06 20:32:01 -0700 | [diff] [blame] | 1803 | struct usb_os_desc *descs[1]; |
| 1804 | char *names[1]; |
Badhri Jagan Sridharan | f545f54 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1805 | |
| 1806 | fi_mtp = kzalloc(sizeof(*fi_mtp), GFP_KERNEL); |
| 1807 | if (!fi_mtp) |
| 1808 | return ERR_PTR(-ENOMEM); |
| 1809 | fi_mtp->func_inst.set_inst_name = mtp_set_inst_name; |
| 1810 | fi_mtp->func_inst.free_func_inst = mtp_free_inst; |
| 1811 | |
Badhri Jagan Sridharan | 5485646 | 2015-10-06 20:32:01 -0700 | [diff] [blame] | 1812 | fi_mtp->mtp_os_desc.ext_compat_id = fi_mtp->mtp_ext_compat_id; |
| 1813 | INIT_LIST_HEAD(&fi_mtp->mtp_os_desc.ext_prop); |
| 1814 | descs[0] = &fi_mtp->mtp_os_desc; |
| 1815 | names[0] = "MTP"; |
Badhri Jagan Sridharan | 5485646 | 2015-10-06 20:32:01 -0700 | [diff] [blame] | 1816 | |
Badhri Jagan Sridharan | f545f54 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1817 | if (mtp_config) { |
| 1818 | ret = mtp_setup_configfs(fi_mtp); |
| 1819 | if (ret) { |
| 1820 | kfree(fi_mtp); |
| 1821 | pr_err("Error setting MTP\n"); |
| 1822 | return ERR_PTR(ret); |
| 1823 | } |
| 1824 | } else |
| 1825 | fi_mtp->dev = _mtp_dev; |
| 1826 | |
| 1827 | config_group_init_type_name(&fi_mtp->func_inst.group, |
| 1828 | "", &mtp_func_type); |
Amit Pundir | 8157e62 | 2016-04-05 21:09:54 +0530 | [diff] [blame] | 1829 | usb_os_desc_prepare_interf_dir(&fi_mtp->func_inst.group, 1, |
| 1830 | descs, names, THIS_MODULE); |
Badhri Jagan Sridharan | f545f54 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1831 | |
Liangliang Lu | 56703d11 | 2017-05-03 16:06:35 +0800 | [diff] [blame] | 1832 | mutex_init(&fi_mtp->dev->read_mutex); |
| 1833 | |
Badhri Jagan Sridharan | f545f54 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1834 | return &fi_mtp->func_inst; |
| 1835 | } |
| 1836 | EXPORT_SYMBOL_GPL(alloc_inst_mtp_ptp); |
| 1837 | |
| 1838 | static struct usb_function_instance *mtp_alloc_inst(void) |
| 1839 | { |
| 1840 | return alloc_inst_mtp_ptp(true); |
| 1841 | } |
| 1842 | |
| 1843 | static int mtp_ctrlreq_configfs(struct usb_function *f, |
| 1844 | const struct usb_ctrlrequest *ctrl) |
| 1845 | { |
| 1846 | return mtp_ctrlrequest(f->config->cdev, ctrl); |
| 1847 | } |
| 1848 | |
| 1849 | static void mtp_free(struct usb_function *f) |
| 1850 | { |
| 1851 | /*NO-OP: no function specific resource allocation in mtp_alloc*/ |
| 1852 | } |
| 1853 | |
| 1854 | struct usb_function *function_alloc_mtp_ptp(struct usb_function_instance *fi, |
| 1855 | bool mtp_config) |
| 1856 | { |
| 1857 | struct mtp_instance *fi_mtp = to_fi_mtp(fi); |
Amit Pundir | 340114e | 2015-08-01 03:26:51 +0530 | [diff] [blame] | 1858 | struct mtp_dev *dev; |
Badhri Jagan Sridharan | f545f54 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1859 | |
Amit Pundir | 340114e | 2015-08-01 03:26:51 +0530 | [diff] [blame] | 1860 | /* |
| 1861 | * PTP piggybacks on MTP function so make sure we have |
| 1862 | * created MTP function before we associate this PTP |
| 1863 | * function with a gadget configuration. |
| 1864 | */ |
| 1865 | if (fi_mtp->dev == NULL) { |
| 1866 | pr_err("Error: Create MTP function before linking" |
| 1867 | " PTP function with a gadget configuration\n"); |
| 1868 | pr_err("\t1: Delete existing PTP function if any\n"); |
| 1869 | pr_err("\t2: Create MTP function\n"); |
| 1870 | pr_err("\t3: Create and symlink PTP function" |
| 1871 | " with a gadget configuration\n"); |
Amit Pundir | f8e6ad2 | 2015-08-11 12:34:45 +0530 | [diff] [blame] | 1872 | return ERR_PTR(-EINVAL); /* Invalid Configuration */ |
Amit Pundir | 340114e | 2015-08-01 03:26:51 +0530 | [diff] [blame] | 1873 | } |
| 1874 | |
| 1875 | dev = fi_mtp->dev; |
Badhri Jagan Sridharan | f545f54 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1876 | dev->function.name = DRIVER_NAME; |
| 1877 | dev->function.strings = mtp_strings; |
| 1878 | if (mtp_config) { |
| 1879 | dev->function.fs_descriptors = fs_mtp_descs; |
| 1880 | dev->function.hs_descriptors = hs_mtp_descs; |
Mark Kuo | 1b61b27 | 2015-08-20 13:01:46 +0800 | [diff] [blame] | 1881 | dev->function.ss_descriptors = ss_mtp_descs; |
Badhri Jagan Sridharan | f545f54 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1882 | } else { |
| 1883 | dev->function.fs_descriptors = fs_ptp_descs; |
| 1884 | dev->function.hs_descriptors = hs_ptp_descs; |
Mark Kuo | 1b61b27 | 2015-08-20 13:01:46 +0800 | [diff] [blame] | 1885 | dev->function.ss_descriptors = ss_ptp_descs; |
Badhri Jagan Sridharan | f545f54 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1886 | } |
| 1887 | dev->function.bind = mtp_function_bind; |
| 1888 | dev->function.unbind = mtp_function_unbind; |
| 1889 | dev->function.set_alt = mtp_function_set_alt; |
| 1890 | dev->function.disable = mtp_function_disable; |
| 1891 | dev->function.setup = mtp_ctrlreq_configfs; |
| 1892 | dev->function.free_func = mtp_free; |
Hemant Kumar | ac9d7c8 | 2016-10-05 19:08:05 -0700 | [diff] [blame] | 1893 | fi->f = &dev->function; |
Badhri Jagan Sridharan | f545f54 | 2014-11-17 21:11:23 -0800 | [diff] [blame] | 1894 | |
| 1895 | return &dev->function; |
| 1896 | } |
| 1897 | EXPORT_SYMBOL_GPL(function_alloc_mtp_ptp); |
| 1898 | |
| 1899 | static struct usb_function *mtp_alloc(struct usb_function_instance *fi) |
| 1900 | { |
| 1901 | return function_alloc_mtp_ptp(fi, true); |
| 1902 | } |
| 1903 | |
| 1904 | DECLARE_USB_FUNCTION_INIT(mtp, mtp_alloc_inst, mtp_alloc); |
| 1905 | MODULE_LICENSE("GPL"); |