1 /* 2 * HID over I2C protocol implementation 3 * 4 * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com> 5 * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France 6 * Copyright (c) 2012 Red Hat, Inc 7 * 8 * This code is partly based on "USB HID support for Linux": 9 * 10 * Copyright (c) 1999 Andreas Gal 11 * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz> 12 * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc 13 * Copyright (c) 2007-2008 Oliver Neukum 14 * Copyright (c) 2006-2010 Jiri Kosina 15 * 16 * This file is subject to the terms and conditions of the GNU General Public 17 * License. See the file COPYING in the main directory of this archive for 18 * more details. 19 */ 20 21 #include <linux/module.h> 22 #include <linux/i2c.h> 23 #include <linux/interrupt.h> 24 #include <linux/input.h> 25 #include <linux/irq.h> 26 #include <linux/delay.h> 27 #include <linux/slab.h> 28 #include <linux/pm.h> 29 #include <linux/pm_runtime.h> 30 #include <linux/device.h> 31 #include <linux/wait.h> 32 #include <linux/err.h> 33 #include <linux/string.h> 34 #include <linux/list.h> 35 #include <linux/jiffies.h> 36 #include <linux/kernel.h> 37 #include <linux/hid.h> 38 #include <linux/mutex.h> 39 #include <linux/acpi.h> 40 #include <linux/of.h> 41 #include <linux/regulator/consumer.h> 42 43 #include <linux/platform_data/i2c-hid.h> 44 45 #include "../hid-ids.h" 46 #include "i2c-hid.h" 47 48 /* quirks to control the device */ 49 #define I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV BIT(0) 50 #define I2C_HID_QUIRK_NO_IRQ_AFTER_RESET BIT(1) 51 #define I2C_HID_QUIRK_NO_RUNTIME_PM BIT(2) 52 #define I2C_HID_QUIRK_DELAY_AFTER_SLEEP BIT(3) 53 54 /* flags */ 55 #define I2C_HID_STARTED 0 56 #define I2C_HID_RESET_PENDING 1 57 #define I2C_HID_READ_PENDING 2 58 59 #define I2C_HID_PWR_ON 0x00 60 #define I2C_HID_PWR_SLEEP 0x01 61 62 /* debug option */ 63 static bool debug; 64 module_param(debug, bool, 0444); 65 MODULE_PARM_DESC(debug, "print a lot of debug information"); 66 67 #define i2c_hid_dbg(ihid, fmt, arg...) \ 68 do { \ 69 if (debug) \ 70 dev_printk(KERN_DEBUG, &(ihid)->client->dev, fmt, ##arg); \ 71 } while (0) 72 73 struct i2c_hid_desc { 74 __le16 wHIDDescLength; 75 __le16 bcdVersion; 76 __le16 wReportDescLength; 77 __le16 wReportDescRegister; 78 __le16 wInputRegister; 79 __le16 wMaxInputLength; 80 __le16 wOutputRegister; 81 __le16 wMaxOutputLength; 82 __le16 wCommandRegister; 83 __le16 wDataRegister; 84 __le16 wVendorID; 85 __le16 wProductID; 86 __le16 wVersionID; 87 __le32 reserved; 88 } __packed; 89 90 struct i2c_hid_cmd { 91 unsigned int registerIndex; 92 __u8 opcode; 93 unsigned int length; 94 bool wait; 95 }; 96 97 union command { 98 u8 data[0]; 99 struct cmd { 100 __le16 reg; 101 __u8 reportTypeID; 102 __u8 opcode; 103 } __packed c; 104 }; 105 106 #define I2C_HID_CMD(opcode_) \ 107 .opcode = opcode_, .length = 4, \ 108 .registerIndex = offsetof(struct i2c_hid_desc, wCommandRegister) 109 110 /* fetch HID descriptor */ 111 static const struct i2c_hid_cmd hid_descr_cmd = { .length = 2 }; 112 /* fetch report descriptors */ 113 static const struct i2c_hid_cmd hid_report_descr_cmd = { 114 .registerIndex = offsetof(struct i2c_hid_desc, 115 wReportDescRegister), 116 .opcode = 0x00, 117 .length = 2 }; 118 /* commands */ 119 static const struct i2c_hid_cmd hid_reset_cmd = { I2C_HID_CMD(0x01), 120 .wait = true }; 121 static const struct i2c_hid_cmd hid_get_report_cmd = { I2C_HID_CMD(0x02) }; 122 static const struct i2c_hid_cmd hid_set_report_cmd = { I2C_HID_CMD(0x03) }; 123 static const struct i2c_hid_cmd hid_set_power_cmd = { I2C_HID_CMD(0x08) }; 124 static const struct i2c_hid_cmd hid_no_cmd = { .length = 0 }; 125 126 /* 127 * These definitions are not used here, but are defined by the spec. 128 * Keeping them here for documentation purposes. 129 * 130 * static const struct i2c_hid_cmd hid_get_idle_cmd = { I2C_HID_CMD(0x04) }; 131 * static const struct i2c_hid_cmd hid_set_idle_cmd = { I2C_HID_CMD(0x05) }; 132 * static const struct i2c_hid_cmd hid_get_protocol_cmd = { I2C_HID_CMD(0x06) }; 133 * static const struct i2c_hid_cmd hid_set_protocol_cmd = { I2C_HID_CMD(0x07) }; 134 */ 135 136 /* The main device structure */ 137 struct i2c_hid { 138 struct i2c_client *client; /* i2c client */ 139 struct hid_device *hid; /* pointer to corresponding HID dev */ 140 union { 141 __u8 hdesc_buffer[sizeof(struct i2c_hid_desc)]; 142 struct i2c_hid_desc hdesc; /* the HID Descriptor */ 143 }; 144 __le16 wHIDDescRegister; /* location of the i2c 145 * register of the HID 146 * descriptor. */ 147 unsigned int bufsize; /* i2c buffer size */ 148 u8 *inbuf; /* Input buffer */ 149 u8 *rawbuf; /* Raw Input buffer */ 150 u8 *cmdbuf; /* Command buffer */ 151 u8 *argsbuf; /* Command arguments buffer */ 152 153 unsigned long flags; /* device flags */ 154 unsigned long quirks; /* Various quirks */ 155 156 wait_queue_head_t wait; /* For waiting the interrupt */ 157 158 struct i2c_hid_platform_data pdata; 159 160 bool irq_wake_enabled; 161 struct mutex reset_lock; 162 163 unsigned long sleep_delay; 164 }; 165 166 static const struct i2c_hid_quirks { 167 __u16 idVendor; 168 __u16 idProduct; 169 __u32 quirks; 170 } i2c_hid_quirks[] = { 171 { USB_VENDOR_ID_WEIDA, USB_DEVICE_ID_WEIDA_8752, 172 I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV }, 173 { USB_VENDOR_ID_WEIDA, USB_DEVICE_ID_WEIDA_8755, 174 I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV }, 175 { I2C_VENDOR_ID_HANTICK, I2C_PRODUCT_ID_HANTICK_5288, 176 I2C_HID_QUIRK_NO_IRQ_AFTER_RESET | 177 I2C_HID_QUIRK_NO_RUNTIME_PM }, 178 { I2C_VENDOR_ID_RAYDIUM, I2C_PRODUCT_ID_RAYDIUM_4B33, 179 I2C_HID_QUIRK_DELAY_AFTER_SLEEP }, 180 { USB_VENDOR_ID_LG, I2C_DEVICE_ID_LG_8001, 181 I2C_HID_QUIRK_NO_RUNTIME_PM }, 182 { I2C_VENDOR_ID_GOODIX, I2C_DEVICE_ID_GOODIX_01F0, 183 I2C_HID_QUIRK_NO_RUNTIME_PM }, 184 { 0, 0 } 185 }; 186 187 /* 188 * i2c_hid_lookup_quirk: return any quirks associated with a I2C HID device 189 * @idVendor: the 16-bit vendor ID 190 * @idProduct: the 16-bit product ID 191 * 192 * Returns: a u32 quirks value. 193 */ 194 static u32 i2c_hid_lookup_quirk(const u16 idVendor, const u16 idProduct) 195 { 196 u32 quirks = 0; 197 int n; 198 199 for (n = 0; i2c_hid_quirks[n].idVendor; n++) 200 if (i2c_hid_quirks[n].idVendor == idVendor && 201 (i2c_hid_quirks[n].idProduct == (__u16)HID_ANY_ID || 202 i2c_hid_quirks[n].idProduct == idProduct)) 203 quirks = i2c_hid_quirks[n].quirks; 204 205 return quirks; 206 } 207 208 static int __i2c_hid_command(struct i2c_client *client, 209 const struct i2c_hid_cmd *command, u8 reportID, 210 u8 reportType, u8 *args, int args_len, 211 unsigned char *buf_recv, int data_len) 212 { 213 struct i2c_hid *ihid = i2c_get_clientdata(client); 214 union command *cmd = (union command *)ihid->cmdbuf; 215 int ret; 216 struct i2c_msg msg[2]; 217 int msg_num = 1; 218 219 int length = command->length; 220 bool wait = command->wait; 221 unsigned int registerIndex = command->registerIndex; 222 223 /* special case for hid_descr_cmd */ 224 if (command == &hid_descr_cmd) { 225 cmd->c.reg = ihid->wHIDDescRegister; 226 } else { 227 cmd->data[0] = ihid->hdesc_buffer[registerIndex]; 228 cmd->data[1] = ihid->hdesc_buffer[registerIndex + 1]; 229 } 230 231 if (length > 2) { 232 cmd->c.opcode = command->opcode; 233 cmd->c.reportTypeID = reportID | reportType << 4; 234 } 235 236 memcpy(cmd->data + length, args, args_len); 237 length += args_len; 238 239 i2c_hid_dbg(ihid, "%s: cmd=%*ph\n", __func__, length, cmd->data); 240 241 msg[0].addr = client->addr; 242 msg[0].flags = client->flags & I2C_M_TEN; 243 msg[0].len = length; 244 msg[0].buf = cmd->data; 245 if (data_len > 0) { 246 msg[1].addr = client->addr; 247 msg[1].flags = client->flags & I2C_M_TEN; 248 msg[1].flags |= I2C_M_RD; 249 msg[1].len = data_len; 250 msg[1].buf = buf_recv; 251 msg_num = 2; 252 set_bit(I2C_HID_READ_PENDING, &ihid->flags); 253 } 254 255 if (wait) 256 set_bit(I2C_HID_RESET_PENDING, &ihid->flags); 257 258 ret = i2c_transfer(client->adapter, msg, msg_num); 259 260 if (data_len > 0) 261 clear_bit(I2C_HID_READ_PENDING, &ihid->flags); 262 263 if (ret != msg_num) 264 return ret < 0 ? ret : -EIO; 265 266 ret = 0; 267 268 if (wait && (ihid->quirks & I2C_HID_QUIRK_NO_IRQ_AFTER_RESET)) { 269 msleep(100); 270 } else if (wait) { 271 i2c_hid_dbg(ihid, "%s: waiting...\n", __func__); 272 if (!wait_event_timeout(ihid->wait, 273 !test_bit(I2C_HID_RESET_PENDING, &ihid->flags), 274 msecs_to_jiffies(5000))) 275 ret = -ENODATA; 276 i2c_hid_dbg(ihid, "%s: finished.\n", __func__); 277 } 278 279 return ret; 280 } 281 282 static int i2c_hid_command(struct i2c_client *client, 283 const struct i2c_hid_cmd *command, 284 unsigned char *buf_recv, int data_len) 285 { 286 return __i2c_hid_command(client, command, 0, 0, NULL, 0, 287 buf_recv, data_len); 288 } 289 290 static int i2c_hid_get_report(struct i2c_client *client, u8 reportType, 291 u8 reportID, unsigned char *buf_recv, int data_len) 292 { 293 struct i2c_hid *ihid = i2c_get_clientdata(client); 294 u8 args[3]; 295 int ret; 296 int args_len = 0; 297 u16 readRegister = le16_to_cpu(ihid->hdesc.wDataRegister); 298 299 i2c_hid_dbg(ihid, "%s\n", __func__); 300 301 if (reportID >= 0x0F) { 302 args[args_len++] = reportID; 303 reportID = 0x0F; 304 } 305 306 args[args_len++] = readRegister & 0xFF; 307 args[args_len++] = readRegister >> 8; 308 309 ret = __i2c_hid_command(client, &hid_get_report_cmd, reportID, 310 reportType, args, args_len, buf_recv, data_len); 311 if (ret) { 312 dev_err(&client->dev, 313 "failed to retrieve report from device.\n"); 314 return ret; 315 } 316 317 return 0; 318 } 319 320 /** 321 * i2c_hid_set_or_send_report: forward an incoming report to the device 322 * @client: the i2c_client of the device 323 * @reportType: 0x03 for HID_FEATURE_REPORT ; 0x02 for HID_OUTPUT_REPORT 324 * @reportID: the report ID 325 * @buf: the actual data to transfer, without the report ID 326 * @len: size of buf 327 * @use_data: true: use SET_REPORT HID command, false: send plain OUTPUT report 328 */ 329 static int i2c_hid_set_or_send_report(struct i2c_client *client, u8 reportType, 330 u8 reportID, unsigned char *buf, size_t data_len, bool use_data) 331 { 332 struct i2c_hid *ihid = i2c_get_clientdata(client); 333 u8 *args = ihid->argsbuf; 334 const struct i2c_hid_cmd *hidcmd; 335 int ret; 336 u16 dataRegister = le16_to_cpu(ihid->hdesc.wDataRegister); 337 u16 outputRegister = le16_to_cpu(ihid->hdesc.wOutputRegister); 338 u16 maxOutputLength = le16_to_cpu(ihid->hdesc.wMaxOutputLength); 339 u16 size; 340 int args_len; 341 int index = 0; 342 343 i2c_hid_dbg(ihid, "%s\n", __func__); 344 345 if (data_len > ihid->bufsize) 346 return -EINVAL; 347 348 size = 2 /* size */ + 349 (reportID ? 1 : 0) /* reportID */ + 350 data_len /* buf */; 351 args_len = (reportID >= 0x0F ? 1 : 0) /* optional third byte */ + 352 2 /* dataRegister */ + 353 size /* args */; 354 355 if (!use_data && maxOutputLength == 0) 356 return -ENOSYS; 357 358 if (reportID >= 0x0F) { 359 args[index++] = reportID; 360 reportID = 0x0F; 361 } 362 363 /* 364 * use the data register for feature reports or if the device does not 365 * support the output register 366 */ 367 if (use_data) { 368 args[index++] = dataRegister & 0xFF; 369 args[index++] = dataRegister >> 8; 370 hidcmd = &hid_set_report_cmd; 371 } else { 372 args[index++] = outputRegister & 0xFF; 373 args[index++] = outputRegister >> 8; 374 hidcmd = &hid_no_cmd; 375 } 376 377 args[index++] = size & 0xFF; 378 args[index++] = size >> 8; 379 380 if (reportID) 381 args[index++] = reportID; 382 383 memcpy(&args[index], buf, data_len); 384 385 ret = __i2c_hid_command(client, hidcmd, reportID, 386 reportType, args, args_len, NULL, 0); 387 if (ret) { 388 dev_err(&client->dev, "failed to set a report to device.\n"); 389 return ret; 390 } 391 392 return data_len; 393 } 394 395 static int i2c_hid_set_power(struct i2c_client *client, int power_state) 396 { 397 struct i2c_hid *ihid = i2c_get_clientdata(client); 398 int ret; 399 unsigned long now, delay; 400 401 i2c_hid_dbg(ihid, "%s\n", __func__); 402 403 /* 404 * Some devices require to send a command to wakeup before power on. 405 * The call will get a return value (EREMOTEIO) but device will be 406 * triggered and activated. After that, it goes like a normal device. 407 */ 408 if (power_state == I2C_HID_PWR_ON && 409 ihid->quirks & I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV) { 410 ret = i2c_hid_command(client, &hid_set_power_cmd, NULL, 0); 411 412 /* Device was already activated */ 413 if (!ret) 414 goto set_pwr_exit; 415 } 416 417 if (ihid->quirks & I2C_HID_QUIRK_DELAY_AFTER_SLEEP && 418 power_state == I2C_HID_PWR_ON) { 419 now = jiffies; 420 if (time_after(ihid->sleep_delay, now)) { 421 delay = jiffies_to_usecs(ihid->sleep_delay - now); 422 usleep_range(delay, delay + 1); 423 } 424 } 425 426 ret = __i2c_hid_command(client, &hid_set_power_cmd, power_state, 427 0, NULL, 0, NULL, 0); 428 429 if (ihid->quirks & I2C_HID_QUIRK_DELAY_AFTER_SLEEP && 430 power_state == I2C_HID_PWR_SLEEP) 431 ihid->sleep_delay = jiffies + msecs_to_jiffies(20); 432 433 if (ret) 434 dev_err(&client->dev, "failed to change power setting.\n"); 435 436 set_pwr_exit: 437 return ret; 438 } 439 440 static int i2c_hid_hwreset(struct i2c_client *client) 441 { 442 struct i2c_hid *ihid = i2c_get_clientdata(client); 443 int ret; 444 445 i2c_hid_dbg(ihid, "%s\n", __func__); 446 447 /* 448 * This prevents sending feature reports while the device is 449 * being reset. Otherwise we may lose the reset complete 450 * interrupt. 451 */ 452 mutex_lock(&ihid->reset_lock); 453 454 ret = i2c_hid_set_power(client, I2C_HID_PWR_ON); 455 if (ret) 456 goto out_unlock; 457 458 /* 459 * The HID over I2C specification states that if a DEVICE needs time 460 * after the PWR_ON request, it should utilise CLOCK stretching. 461 * However, it has been observered that the Windows driver provides a 462 * 1ms sleep between the PWR_ON and RESET requests and that some devices 463 * rely on this. 464 */ 465 usleep_range(1000, 5000); 466 467 i2c_hid_dbg(ihid, "resetting...\n"); 468 469 ret = i2c_hid_command(client, &hid_reset_cmd, NULL, 0); 470 if (ret) { 471 dev_err(&client->dev, "failed to reset device.\n"); 472 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP); 473 } 474 475 out_unlock: 476 mutex_unlock(&ihid->reset_lock); 477 return ret; 478 } 479 480 static void i2c_hid_get_input(struct i2c_hid *ihid) 481 { 482 int ret; 483 u32 ret_size; 484 int size = le16_to_cpu(ihid->hdesc.wMaxInputLength); 485 486 if (size > ihid->bufsize) 487 size = ihid->bufsize; 488 489 ret = i2c_master_recv(ihid->client, ihid->inbuf, size); 490 if (ret != size) { 491 if (ret < 0) 492 return; 493 494 dev_err(&ihid->client->dev, "%s: got %d data instead of %d\n", 495 __func__, ret, size); 496 return; 497 } 498 499 ret_size = ihid->inbuf[0] | ihid->inbuf[1] << 8; 500 501 if (!ret_size) { 502 /* host or device initiated RESET completed */ 503 if (test_and_clear_bit(I2C_HID_RESET_PENDING, &ihid->flags)) 504 wake_up(&ihid->wait); 505 return; 506 } 507 508 if ((ret_size > size) || (ret_size < 2)) { 509 dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n", 510 __func__, size, ret_size); 511 return; 512 } 513 514 i2c_hid_dbg(ihid, "input: %*ph\n", ret_size, ihid->inbuf); 515 516 if (test_bit(I2C_HID_STARTED, &ihid->flags)) 517 hid_input_report(ihid->hid, HID_INPUT_REPORT, ihid->inbuf + 2, 518 ret_size - 2, 1); 519 520 return; 521 } 522 523 static irqreturn_t i2c_hid_irq(int irq, void *dev_id) 524 { 525 struct i2c_hid *ihid = dev_id; 526 527 if (test_bit(I2C_HID_READ_PENDING, &ihid->flags)) 528 return IRQ_HANDLED; 529 530 i2c_hid_get_input(ihid); 531 532 return IRQ_HANDLED; 533 } 534 535 static int i2c_hid_get_report_length(struct hid_report *report) 536 { 537 return ((report->size - 1) >> 3) + 1 + 538 report->device->report_enum[report->type].numbered + 2; 539 } 540 541 /* 542 * Traverse the supplied list of reports and find the longest 543 */ 544 static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type, 545 unsigned int *max) 546 { 547 struct hid_report *report; 548 unsigned int size; 549 550 /* We should not rely on wMaxInputLength, as some devices may set it to 551 * a wrong length. */ 552 list_for_each_entry(report, &hid->report_enum[type].report_list, list) { 553 size = i2c_hid_get_report_length(report); 554 if (*max < size) 555 *max = size; 556 } 557 } 558 559 static void i2c_hid_free_buffers(struct i2c_hid *ihid) 560 { 561 kfree(ihid->inbuf); 562 kfree(ihid->rawbuf); 563 kfree(ihid->argsbuf); 564 kfree(ihid->cmdbuf); 565 ihid->inbuf = NULL; 566 ihid->rawbuf = NULL; 567 ihid->cmdbuf = NULL; 568 ihid->argsbuf = NULL; 569 ihid->bufsize = 0; 570 } 571 572 static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size) 573 { 574 /* the worst case is computed from the set_report command with a 575 * reportID > 15 and the maximum report length */ 576 int args_len = sizeof(__u8) + /* ReportID */ 577 sizeof(__u8) + /* optional ReportID byte */ 578 sizeof(__u16) + /* data register */ 579 sizeof(__u16) + /* size of the report */ 580 report_size; /* report */ 581 582 ihid->inbuf = kzalloc(report_size, GFP_KERNEL); 583 ihid->rawbuf = kzalloc(report_size, GFP_KERNEL); 584 ihid->argsbuf = kzalloc(args_len, GFP_KERNEL); 585 ihid->cmdbuf = kzalloc(sizeof(union command) + args_len, GFP_KERNEL); 586 587 if (!ihid->inbuf || !ihid->rawbuf || !ihid->argsbuf || !ihid->cmdbuf) { 588 i2c_hid_free_buffers(ihid); 589 return -ENOMEM; 590 } 591 592 ihid->bufsize = report_size; 593 594 return 0; 595 } 596 597 static int i2c_hid_get_raw_report(struct hid_device *hid, 598 unsigned char report_number, __u8 *buf, size_t count, 599 unsigned char report_type) 600 { 601 struct i2c_client *client = hid->driver_data; 602 struct i2c_hid *ihid = i2c_get_clientdata(client); 603 size_t ret_count, ask_count; 604 int ret; 605 606 if (report_type == HID_OUTPUT_REPORT) 607 return -EINVAL; 608 609 /* +2 bytes to include the size of the reply in the query buffer */ 610 ask_count = min(count + 2, (size_t)ihid->bufsize); 611 612 ret = i2c_hid_get_report(client, 613 report_type == HID_FEATURE_REPORT ? 0x03 : 0x01, 614 report_number, ihid->rawbuf, ask_count); 615 616 if (ret < 0) 617 return ret; 618 619 ret_count = ihid->rawbuf[0] | (ihid->rawbuf[1] << 8); 620 621 if (ret_count <= 2) 622 return 0; 623 624 ret_count = min(ret_count, ask_count); 625 626 /* The query buffer contains the size, dropping it in the reply */ 627 count = min(count, ret_count - 2); 628 memcpy(buf, ihid->rawbuf + 2, count); 629 630 return count; 631 } 632 633 static int i2c_hid_output_raw_report(struct hid_device *hid, __u8 *buf, 634 size_t count, unsigned char report_type, bool use_data) 635 { 636 struct i2c_client *client = hid->driver_data; 637 struct i2c_hid *ihid = i2c_get_clientdata(client); 638 int report_id = buf[0]; 639 int ret; 640 641 if (report_type == HID_INPUT_REPORT) 642 return -EINVAL; 643 644 mutex_lock(&ihid->reset_lock); 645 646 if (report_id) { 647 buf++; 648 count--; 649 } 650 651 ret = i2c_hid_set_or_send_report(client, 652 report_type == HID_FEATURE_REPORT ? 0x03 : 0x02, 653 report_id, buf, count, use_data); 654 655 if (report_id && ret >= 0) 656 ret++; /* add report_id to the number of transfered bytes */ 657 658 mutex_unlock(&ihid->reset_lock); 659 660 return ret; 661 } 662 663 static int i2c_hid_output_report(struct hid_device *hid, __u8 *buf, 664 size_t count) 665 { 666 return i2c_hid_output_raw_report(hid, buf, count, HID_OUTPUT_REPORT, 667 false); 668 } 669 670 static int i2c_hid_raw_request(struct hid_device *hid, unsigned char reportnum, 671 __u8 *buf, size_t len, unsigned char rtype, 672 int reqtype) 673 { 674 switch (reqtype) { 675 case HID_REQ_GET_REPORT: 676 return i2c_hid_get_raw_report(hid, reportnum, buf, len, rtype); 677 case HID_REQ_SET_REPORT: 678 if (buf[0] != reportnum) 679 return -EINVAL; 680 return i2c_hid_output_raw_report(hid, buf, len, rtype, true); 681 default: 682 return -EIO; 683 } 684 } 685 686 static int i2c_hid_parse(struct hid_device *hid) 687 { 688 struct i2c_client *client = hid->driver_data; 689 struct i2c_hid *ihid = i2c_get_clientdata(client); 690 struct i2c_hid_desc *hdesc = &ihid->hdesc; 691 unsigned int rsize; 692 char *rdesc; 693 int ret; 694 int tries = 3; 695 char *use_override; 696 697 i2c_hid_dbg(ihid, "entering %s\n", __func__); 698 699 rsize = le16_to_cpu(hdesc->wReportDescLength); 700 if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) { 701 dbg_hid("weird size of report descriptor (%u)\n", rsize); 702 return -EINVAL; 703 } 704 705 do { 706 ret = i2c_hid_hwreset(client); 707 if (ret) 708 msleep(1000); 709 } while (tries-- > 0 && ret); 710 711 if (ret) 712 return ret; 713 714 use_override = i2c_hid_get_dmi_hid_report_desc_override(client->name, 715 &rsize); 716 717 if (use_override) { 718 rdesc = use_override; 719 i2c_hid_dbg(ihid, "Using a HID report descriptor override\n"); 720 } else { 721 rdesc = kzalloc(rsize, GFP_KERNEL); 722 723 if (!rdesc) { 724 dbg_hid("couldn't allocate rdesc memory\n"); 725 return -ENOMEM; 726 } 727 728 i2c_hid_dbg(ihid, "asking HID report descriptor\n"); 729 730 ret = i2c_hid_command(client, &hid_report_descr_cmd, 731 rdesc, rsize); 732 if (ret) { 733 hid_err(hid, "reading report descriptor failed\n"); 734 kfree(rdesc); 735 return -EIO; 736 } 737 } 738 739 i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc); 740 741 ret = hid_parse_report(hid, rdesc, rsize); 742 if (!use_override) 743 kfree(rdesc); 744 745 if (ret) { 746 dbg_hid("parsing report descriptor failed\n"); 747 return ret; 748 } 749 750 return 0; 751 } 752 753 static int i2c_hid_start(struct hid_device *hid) 754 { 755 struct i2c_client *client = hid->driver_data; 756 struct i2c_hid *ihid = i2c_get_clientdata(client); 757 int ret; 758 unsigned int bufsize = HID_MIN_BUFFER_SIZE; 759 760 i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize); 761 i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize); 762 i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize); 763 764 if (bufsize > ihid->bufsize) { 765 disable_irq(client->irq); 766 i2c_hid_free_buffers(ihid); 767 768 ret = i2c_hid_alloc_buffers(ihid, bufsize); 769 enable_irq(client->irq); 770 771 if (ret) 772 return ret; 773 } 774 775 return 0; 776 } 777 778 static void i2c_hid_stop(struct hid_device *hid) 779 { 780 hid->claimed = 0; 781 } 782 783 static int i2c_hid_open(struct hid_device *hid) 784 { 785 struct i2c_client *client = hid->driver_data; 786 struct i2c_hid *ihid = i2c_get_clientdata(client); 787 int ret = 0; 788 789 ret = pm_runtime_get_sync(&client->dev); 790 if (ret < 0) 791 return ret; 792 793 set_bit(I2C_HID_STARTED, &ihid->flags); 794 return 0; 795 } 796 797 static void i2c_hid_close(struct hid_device *hid) 798 { 799 struct i2c_client *client = hid->driver_data; 800 struct i2c_hid *ihid = i2c_get_clientdata(client); 801 802 clear_bit(I2C_HID_STARTED, &ihid->flags); 803 804 /* Save some power */ 805 pm_runtime_put(&client->dev); 806 } 807 808 static int i2c_hid_power(struct hid_device *hid, int lvl) 809 { 810 struct i2c_client *client = hid->driver_data; 811 struct i2c_hid *ihid = i2c_get_clientdata(client); 812 813 i2c_hid_dbg(ihid, "%s lvl:%d\n", __func__, lvl); 814 815 switch (lvl) { 816 case PM_HINT_FULLON: 817 pm_runtime_get_sync(&client->dev); 818 break; 819 case PM_HINT_NORMAL: 820 pm_runtime_put(&client->dev); 821 break; 822 } 823 return 0; 824 } 825 826 struct hid_ll_driver i2c_hid_ll_driver = { 827 .parse = i2c_hid_parse, 828 .start = i2c_hid_start, 829 .stop = i2c_hid_stop, 830 .open = i2c_hid_open, 831 .close = i2c_hid_close, 832 .power = i2c_hid_power, 833 .output_report = i2c_hid_output_report, 834 .raw_request = i2c_hid_raw_request, 835 }; 836 EXPORT_SYMBOL_GPL(i2c_hid_ll_driver); 837 838 static int i2c_hid_init_irq(struct i2c_client *client) 839 { 840 struct i2c_hid *ihid = i2c_get_clientdata(client); 841 unsigned long irqflags = 0; 842 int ret; 843 844 dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq); 845 846 if (!irq_get_trigger_type(client->irq)) 847 irqflags = IRQF_TRIGGER_LOW; 848 849 ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq, 850 irqflags | IRQF_ONESHOT, client->name, ihid); 851 if (ret < 0) { 852 dev_warn(&client->dev, 853 "Could not register for %s interrupt, irq = %d," 854 " ret = %d\n", 855 client->name, client->irq, ret); 856 857 return ret; 858 } 859 860 return 0; 861 } 862 863 static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid) 864 { 865 struct i2c_client *client = ihid->client; 866 struct i2c_hid_desc *hdesc = &ihid->hdesc; 867 unsigned int dsize; 868 int ret; 869 870 /* i2c hid fetch using a fixed descriptor size (30 bytes) */ 871 if (i2c_hid_get_dmi_i2c_hid_desc_override(client->name)) { 872 i2c_hid_dbg(ihid, "Using a HID descriptor override\n"); 873 ihid->hdesc = 874 *i2c_hid_get_dmi_i2c_hid_desc_override(client->name); 875 } else { 876 i2c_hid_dbg(ihid, "Fetching the HID descriptor\n"); 877 ret = i2c_hid_command(client, &hid_descr_cmd, 878 ihid->hdesc_buffer, 879 sizeof(struct i2c_hid_desc)); 880 if (ret) { 881 dev_err(&client->dev, "hid_descr_cmd failed\n"); 882 return -ENODEV; 883 } 884 } 885 886 /* Validate the length of HID descriptor, the 4 first bytes: 887 * bytes 0-1 -> length 888 * bytes 2-3 -> bcdVersion (has to be 1.00) */ 889 /* check bcdVersion == 1.0 */ 890 if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) { 891 dev_err(&client->dev, 892 "unexpected HID descriptor bcdVersion (0x%04hx)\n", 893 le16_to_cpu(hdesc->bcdVersion)); 894 return -ENODEV; 895 } 896 897 /* Descriptor length should be 30 bytes as per the specification */ 898 dsize = le16_to_cpu(hdesc->wHIDDescLength); 899 if (dsize != sizeof(struct i2c_hid_desc)) { 900 dev_err(&client->dev, "weird size of HID descriptor (%u)\n", 901 dsize); 902 return -ENODEV; 903 } 904 i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, ihid->hdesc_buffer); 905 return 0; 906 } 907 908 #ifdef CONFIG_ACPI 909 static const struct acpi_device_id i2c_hid_acpi_blacklist[] = { 910 /* 911 * The CHPN0001 ACPI device, which is used to describe the Chipone 912 * ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible. 913 */ 914 {"CHPN0001", 0 }, 915 { }, 916 }; 917 918 static int i2c_hid_acpi_pdata(struct i2c_client *client, 919 struct i2c_hid_platform_data *pdata) 920 { 921 static guid_t i2c_hid_guid = 922 GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555, 923 0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE); 924 union acpi_object *obj; 925 struct acpi_device *adev; 926 acpi_handle handle; 927 928 handle = ACPI_HANDLE(&client->dev); 929 if (!handle || acpi_bus_get_device(handle, &adev)) { 930 dev_err(&client->dev, "Error could not get ACPI device\n"); 931 return -ENODEV; 932 } 933 934 if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0) 935 return -ENODEV; 936 937 obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL, 938 ACPI_TYPE_INTEGER); 939 if (!obj) { 940 dev_err(&client->dev, "Error _DSM call to get HID descriptor address failed\n"); 941 return -ENODEV; 942 } 943 944 pdata->hid_descriptor_address = obj->integer.value; 945 ACPI_FREE(obj); 946 947 return 0; 948 } 949 950 static void i2c_hid_acpi_fix_up_power(struct device *dev) 951 { 952 struct acpi_device *adev; 953 954 adev = ACPI_COMPANION(dev); 955 if (adev) 956 acpi_device_fix_up_power(adev); 957 } 958 959 static const struct acpi_device_id i2c_hid_acpi_match[] = { 960 {"ACPI0C50", 0 }, 961 {"PNP0C50", 0 }, 962 { }, 963 }; 964 MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match); 965 #else 966 static inline int i2c_hid_acpi_pdata(struct i2c_client *client, 967 struct i2c_hid_platform_data *pdata) 968 { 969 return -ENODEV; 970 } 971 972 static inline void i2c_hid_acpi_fix_up_power(struct device *dev) {} 973 #endif 974 975 #ifdef CONFIG_OF 976 static int i2c_hid_of_probe(struct i2c_client *client, 977 struct i2c_hid_platform_data *pdata) 978 { 979 struct device *dev = &client->dev; 980 u32 val; 981 int ret; 982 983 ret = of_property_read_u32(dev->of_node, "hid-descr-addr", &val); 984 if (ret) { 985 dev_err(&client->dev, "HID register address not provided\n"); 986 return -ENODEV; 987 } 988 if (val >> 16) { 989 dev_err(&client->dev, "Bad HID register address: 0x%08x\n", 990 val); 991 return -EINVAL; 992 } 993 pdata->hid_descriptor_address = val; 994 995 return 0; 996 } 997 998 static const struct of_device_id i2c_hid_of_match[] = { 999 { .compatible = "hid-over-i2c" }, 1000 {}, 1001 }; 1002 MODULE_DEVICE_TABLE(of, i2c_hid_of_match); 1003 #else 1004 static inline int i2c_hid_of_probe(struct i2c_client *client, 1005 struct i2c_hid_platform_data *pdata) 1006 { 1007 return -ENODEV; 1008 } 1009 #endif 1010 1011 static void i2c_hid_fwnode_probe(struct i2c_client *client, 1012 struct i2c_hid_platform_data *pdata) 1013 { 1014 u32 val; 1015 1016 if (!device_property_read_u32(&client->dev, "post-power-on-delay-ms", 1017 &val)) 1018 pdata->post_power_delay_ms = val; 1019 } 1020 1021 static int i2c_hid_probe(struct i2c_client *client, 1022 const struct i2c_device_id *dev_id) 1023 { 1024 int ret; 1025 struct i2c_hid *ihid; 1026 struct hid_device *hid; 1027 __u16 hidRegister; 1028 struct i2c_hid_platform_data *platform_data = client->dev.platform_data; 1029 1030 dbg_hid("HID probe called for i2c 0x%02x\n", client->addr); 1031 1032 if (!client->irq) { 1033 dev_err(&client->dev, 1034 "HID over i2c has not been provided an Int IRQ\n"); 1035 return -EINVAL; 1036 } 1037 1038 if (client->irq < 0) { 1039 if (client->irq != -EPROBE_DEFER) 1040 dev_err(&client->dev, 1041 "HID over i2c doesn't have a valid IRQ\n"); 1042 return client->irq; 1043 } 1044 1045 ihid = devm_kzalloc(&client->dev, sizeof(*ihid), GFP_KERNEL); 1046 if (!ihid) 1047 return -ENOMEM; 1048 1049 if (client->dev.of_node) { 1050 ret = i2c_hid_of_probe(client, &ihid->pdata); 1051 if (ret) 1052 return ret; 1053 } else if (!platform_data) { 1054 ret = i2c_hid_acpi_pdata(client, &ihid->pdata); 1055 if (ret) 1056 return ret; 1057 } else { 1058 ihid->pdata = *platform_data; 1059 } 1060 1061 /* Parse platform agnostic common properties from ACPI / device tree */ 1062 i2c_hid_fwnode_probe(client, &ihid->pdata); 1063 1064 ihid->pdata.supplies[0].supply = "vdd"; 1065 ihid->pdata.supplies[1].supply = "vddl"; 1066 1067 ret = devm_regulator_bulk_get(&client->dev, 1068 ARRAY_SIZE(ihid->pdata.supplies), 1069 ihid->pdata.supplies); 1070 if (ret) 1071 return ret; 1072 1073 ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies), 1074 ihid->pdata.supplies); 1075 if (ret < 0) 1076 return ret; 1077 1078 if (ihid->pdata.post_power_delay_ms) 1079 msleep(ihid->pdata.post_power_delay_ms); 1080 1081 i2c_set_clientdata(client, ihid); 1082 1083 ihid->client = client; 1084 1085 hidRegister = ihid->pdata.hid_descriptor_address; 1086 ihid->wHIDDescRegister = cpu_to_le16(hidRegister); 1087 1088 init_waitqueue_head(&ihid->wait); 1089 mutex_init(&ihid->reset_lock); 1090 1091 /* we need to allocate the command buffer without knowing the maximum 1092 * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the 1093 * real computation later. */ 1094 ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE); 1095 if (ret < 0) 1096 goto err_regulator; 1097 1098 i2c_hid_acpi_fix_up_power(&client->dev); 1099 1100 pm_runtime_get_noresume(&client->dev); 1101 pm_runtime_set_active(&client->dev); 1102 pm_runtime_enable(&client->dev); 1103 device_enable_async_suspend(&client->dev); 1104 1105 /* Make sure there is something at this address */ 1106 ret = i2c_smbus_read_byte(client); 1107 if (ret < 0) { 1108 dev_dbg(&client->dev, "nothing at this address: %d\n", ret); 1109 ret = -ENXIO; 1110 goto err_pm; 1111 } 1112 1113 ret = i2c_hid_fetch_hid_descriptor(ihid); 1114 if (ret < 0) 1115 goto err_pm; 1116 1117 ret = i2c_hid_init_irq(client); 1118 if (ret < 0) 1119 goto err_pm; 1120 1121 hid = hid_allocate_device(); 1122 if (IS_ERR(hid)) { 1123 ret = PTR_ERR(hid); 1124 goto err_irq; 1125 } 1126 1127 ihid->hid = hid; 1128 1129 hid->driver_data = client; 1130 hid->ll_driver = &i2c_hid_ll_driver; 1131 hid->dev.parent = &client->dev; 1132 hid->bus = BUS_I2C; 1133 hid->version = le16_to_cpu(ihid->hdesc.bcdVersion); 1134 hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID); 1135 hid->product = le16_to_cpu(ihid->hdesc.wProductID); 1136 1137 snprintf(hid->name, sizeof(hid->name), "%s %04hX:%04hX", 1138 client->name, hid->vendor, hid->product); 1139 strlcpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys)); 1140 1141 ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product); 1142 1143 ret = hid_add_device(hid); 1144 if (ret) { 1145 if (ret != -ENODEV) 1146 hid_err(client, "can't add hid device: %d\n", ret); 1147 goto err_mem_free; 1148 } 1149 1150 if (!(ihid->quirks & I2C_HID_QUIRK_NO_RUNTIME_PM)) 1151 pm_runtime_put(&client->dev); 1152 1153 return 0; 1154 1155 err_mem_free: 1156 hid_destroy_device(hid); 1157 1158 err_irq: 1159 free_irq(client->irq, ihid); 1160 1161 err_pm: 1162 pm_runtime_put_noidle(&client->dev); 1163 pm_runtime_disable(&client->dev); 1164 1165 err_regulator: 1166 regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies), 1167 ihid->pdata.supplies); 1168 i2c_hid_free_buffers(ihid); 1169 return ret; 1170 } 1171 1172 static int i2c_hid_remove(struct i2c_client *client) 1173 { 1174 struct i2c_hid *ihid = i2c_get_clientdata(client); 1175 struct hid_device *hid; 1176 1177 if (!(ihid->quirks & I2C_HID_QUIRK_NO_RUNTIME_PM)) 1178 pm_runtime_get_sync(&client->dev); 1179 pm_runtime_disable(&client->dev); 1180 pm_runtime_set_suspended(&client->dev); 1181 pm_runtime_put_noidle(&client->dev); 1182 1183 hid = ihid->hid; 1184 hid_destroy_device(hid); 1185 1186 free_irq(client->irq, ihid); 1187 1188 if (ihid->bufsize) 1189 i2c_hid_free_buffers(ihid); 1190 1191 regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies), 1192 ihid->pdata.supplies); 1193 1194 return 0; 1195 } 1196 1197 static void i2c_hid_shutdown(struct i2c_client *client) 1198 { 1199 struct i2c_hid *ihid = i2c_get_clientdata(client); 1200 1201 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP); 1202 free_irq(client->irq, ihid); 1203 } 1204 1205 #ifdef CONFIG_PM_SLEEP 1206 static int i2c_hid_suspend(struct device *dev) 1207 { 1208 struct i2c_client *client = to_i2c_client(dev); 1209 struct i2c_hid *ihid = i2c_get_clientdata(client); 1210 struct hid_device *hid = ihid->hid; 1211 int ret; 1212 int wake_status; 1213 1214 if (hid->driver && hid->driver->suspend) { 1215 /* 1216 * Wake up the device so that IO issues in 1217 * HID driver's suspend code can succeed. 1218 */ 1219 ret = pm_runtime_resume(dev); 1220 if (ret < 0) 1221 return ret; 1222 1223 ret = hid->driver->suspend(hid, PMSG_SUSPEND); 1224 if (ret < 0) 1225 return ret; 1226 } 1227 1228 if (!pm_runtime_suspended(dev)) { 1229 /* Save some power */ 1230 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP); 1231 1232 disable_irq(client->irq); 1233 } 1234 1235 if (device_may_wakeup(&client->dev)) { 1236 wake_status = enable_irq_wake(client->irq); 1237 if (!wake_status) 1238 ihid->irq_wake_enabled = true; 1239 else 1240 hid_warn(hid, "Failed to enable irq wake: %d\n", 1241 wake_status); 1242 } else { 1243 regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies), 1244 ihid->pdata.supplies); 1245 } 1246 1247 return 0; 1248 } 1249 1250 static int i2c_hid_resume(struct device *dev) 1251 { 1252 int ret; 1253 struct i2c_client *client = to_i2c_client(dev); 1254 struct i2c_hid *ihid = i2c_get_clientdata(client); 1255 struct hid_device *hid = ihid->hid; 1256 int wake_status; 1257 1258 if (!device_may_wakeup(&client->dev)) { 1259 ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies), 1260 ihid->pdata.supplies); 1261 if (ret) 1262 hid_warn(hid, "Failed to enable supplies: %d\n", ret); 1263 1264 if (ihid->pdata.post_power_delay_ms) 1265 msleep(ihid->pdata.post_power_delay_ms); 1266 } else if (ihid->irq_wake_enabled) { 1267 wake_status = disable_irq_wake(client->irq); 1268 if (!wake_status) 1269 ihid->irq_wake_enabled = false; 1270 else 1271 hid_warn(hid, "Failed to disable irq wake: %d\n", 1272 wake_status); 1273 } 1274 1275 /* We'll resume to full power */ 1276 pm_runtime_disable(dev); 1277 pm_runtime_set_active(dev); 1278 pm_runtime_enable(dev); 1279 1280 enable_irq(client->irq); 1281 1282 /* Instead of resetting device, simply powers the device on. This 1283 * solves "incomplete reports" on Raydium devices 2386:3118 and 1284 * 2386:4B33 and fixes various SIS touchscreens no longer sending 1285 * data after a suspend/resume. 1286 */ 1287 ret = i2c_hid_set_power(client, I2C_HID_PWR_ON); 1288 if (ret) 1289 return ret; 1290 1291 if (hid->driver && hid->driver->reset_resume) { 1292 ret = hid->driver->reset_resume(hid); 1293 return ret; 1294 } 1295 1296 return 0; 1297 } 1298 #endif 1299 1300 #ifdef CONFIG_PM 1301 static int i2c_hid_runtime_suspend(struct device *dev) 1302 { 1303 struct i2c_client *client = to_i2c_client(dev); 1304 1305 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP); 1306 disable_irq(client->irq); 1307 return 0; 1308 } 1309 1310 static int i2c_hid_runtime_resume(struct device *dev) 1311 { 1312 struct i2c_client *client = to_i2c_client(dev); 1313 1314 enable_irq(client->irq); 1315 i2c_hid_set_power(client, I2C_HID_PWR_ON); 1316 return 0; 1317 } 1318 #endif 1319 1320 static const struct dev_pm_ops i2c_hid_pm = { 1321 SET_SYSTEM_SLEEP_PM_OPS(i2c_hid_suspend, i2c_hid_resume) 1322 SET_RUNTIME_PM_OPS(i2c_hid_runtime_suspend, i2c_hid_runtime_resume, 1323 NULL) 1324 }; 1325 1326 static const struct i2c_device_id i2c_hid_id_table[] = { 1327 { "hid", 0 }, 1328 { "hid-over-i2c", 0 }, 1329 { }, 1330 }; 1331 MODULE_DEVICE_TABLE(i2c, i2c_hid_id_table); 1332 1333 1334 static struct i2c_driver i2c_hid_driver = { 1335 .driver = { 1336 .name = "i2c_hid", 1337 .pm = &i2c_hid_pm, 1338 .acpi_match_table = ACPI_PTR(i2c_hid_acpi_match), 1339 .of_match_table = of_match_ptr(i2c_hid_of_match), 1340 }, 1341 1342 .probe = i2c_hid_probe, 1343 .remove = i2c_hid_remove, 1344 .shutdown = i2c_hid_shutdown, 1345 .id_table = i2c_hid_id_table, 1346 }; 1347 1348 module_i2c_driver(i2c_hid_driver); 1349 1350 MODULE_DESCRIPTION("HID over I2C core driver"); 1351 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>"); 1352 MODULE_LICENSE("GPL"); 1353