1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * hid-cp2112.c - Silicon Labs HID USB to SMBus master bridge 4 * Copyright (c) 2013,2014 Uplogix, Inc. 5 * David Barksdale <dbarksdale@uplogix.com> 6 */ 7 8 /* 9 * The Silicon Labs CP2112 chip is a USB HID device which provides an 10 * SMBus controller for talking to slave devices and 8 GPIO pins. The 11 * host communicates with the CP2112 via raw HID reports. 12 * 13 * Data Sheet: 14 * https://www.silabs.com/Support%20Documents/TechnicalDocs/CP2112.pdf 15 * Programming Interface Specification: 16 * https://www.silabs.com/documents/public/application-notes/an495-cp2112-interface-specification.pdf 17 */ 18 19 #include <linux/bitops.h> 20 #include <linux/cleanup.h> 21 #include <linux/gpio/driver.h> 22 #include <linux/hid.h> 23 #include <linux/hidraw.h> 24 #include <linux/i2c.h> 25 #include <linux/module.h> 26 #include <linux/mutex.h> 27 #include <linux/nls.h> 28 #include <linux/string_choices.h> 29 #include <linux/usb/ch9.h> 30 #include "hid-ids.h" 31 32 #define CP2112_REPORT_MAX_LENGTH 64 33 #define CP2112_GPIO_CONFIG_LENGTH 5 34 #define CP2112_GPIO_GET_LENGTH 2 35 #define CP2112_GPIO_SET_LENGTH 3 36 #define CP2112_GPIO_MAX_GPIO 8 37 #define CP2112_GPIO_ALL_GPIO_MASK GENMASK(7, 0) 38 39 enum { 40 CP2112_GPIO_CONFIG = 0x02, 41 CP2112_GPIO_GET = 0x03, 42 CP2112_GPIO_SET = 0x04, 43 CP2112_GET_VERSION_INFO = 0x05, 44 CP2112_SMBUS_CONFIG = 0x06, 45 CP2112_DATA_READ_REQUEST = 0x10, 46 CP2112_DATA_WRITE_READ_REQUEST = 0x11, 47 CP2112_DATA_READ_FORCE_SEND = 0x12, 48 CP2112_DATA_READ_RESPONSE = 0x13, 49 CP2112_DATA_WRITE_REQUEST = 0x14, 50 CP2112_TRANSFER_STATUS_REQUEST = 0x15, 51 CP2112_TRANSFER_STATUS_RESPONSE = 0x16, 52 CP2112_CANCEL_TRANSFER = 0x17, 53 CP2112_LOCK_BYTE = 0x20, 54 CP2112_USB_CONFIG = 0x21, 55 CP2112_MANUFACTURER_STRING = 0x22, 56 CP2112_PRODUCT_STRING = 0x23, 57 CP2112_SERIAL_STRING = 0x24, 58 }; 59 60 enum { 61 STATUS0_IDLE = 0x00, 62 STATUS0_BUSY = 0x01, 63 STATUS0_COMPLETE = 0x02, 64 STATUS0_ERROR = 0x03, 65 }; 66 67 enum { 68 STATUS1_TIMEOUT_NACK = 0x00, 69 STATUS1_TIMEOUT_BUS = 0x01, 70 STATUS1_ARBITRATION_LOST = 0x02, 71 STATUS1_READ_INCOMPLETE = 0x03, 72 STATUS1_WRITE_INCOMPLETE = 0x04, 73 STATUS1_SUCCESS = 0x05, 74 }; 75 76 struct cp2112_smbus_config_report { 77 u8 report; /* CP2112_SMBUS_CONFIG */ 78 __be32 clock_speed; /* Hz */ 79 u8 device_address; /* Stored in the upper 7 bits */ 80 u8 auto_send_read; /* 1 = enabled, 0 = disabled */ 81 __be16 write_timeout; /* ms, 0 = no timeout */ 82 __be16 read_timeout; /* ms, 0 = no timeout */ 83 u8 scl_low_timeout; /* 1 = enabled, 0 = disabled */ 84 __be16 retry_time; /* # of retries, 0 = no limit */ 85 } __packed; 86 87 struct cp2112_usb_config_report { 88 u8 report; /* CP2112_USB_CONFIG */ 89 __le16 vid; /* Vendor ID */ 90 __le16 pid; /* Product ID */ 91 u8 max_power; /* Power requested in 2mA units */ 92 u8 power_mode; /* 0x00 = bus powered 93 0x01 = self powered & regulator off 94 0x02 = self powered & regulator on */ 95 u8 release_major; 96 u8 release_minor; 97 u8 mask; /* What fields to program */ 98 } __packed; 99 100 struct cp2112_read_req_report { 101 u8 report; /* CP2112_DATA_READ_REQUEST */ 102 u8 slave_address; 103 __be16 length; 104 } __packed; 105 106 struct cp2112_write_read_req_report { 107 u8 report; /* CP2112_DATA_WRITE_READ_REQUEST */ 108 u8 slave_address; 109 __be16 length; 110 u8 target_address_length; 111 u8 target_address[16]; 112 } __packed; 113 114 struct cp2112_write_req_report { 115 u8 report; /* CP2112_DATA_WRITE_REQUEST */ 116 u8 slave_address; 117 u8 length; 118 u8 data[61]; 119 } __packed; 120 121 struct cp2112_force_read_report { 122 u8 report; /* CP2112_DATA_READ_FORCE_SEND */ 123 __be16 length; 124 } __packed; 125 126 struct cp2112_xfer_status_report { 127 u8 report; /* CP2112_TRANSFER_STATUS_RESPONSE */ 128 u8 status0; /* STATUS0_* */ 129 u8 status1; /* STATUS1_* */ 130 __be16 retries; 131 __be16 length; 132 } __packed; 133 134 struct cp2112_string_report { 135 u8 dummy; /* force .string to be aligned */ 136 struct_group_attr(contents, __packed, 137 u8 report; /* CP2112_*_STRING */ 138 u8 length; /* length in bytes of everything after .report */ 139 u8 type; /* USB_DT_STRING */ 140 wchar_t string[30]; /* UTF16_LITTLE_ENDIAN string */ 141 ); 142 } __packed; 143 144 /* Number of times to request transfer status before giving up waiting for a 145 transfer to complete. This may need to be changed if SMBUS clock, retries, 146 or read/write/scl_low timeout settings are changed. */ 147 static const int XFER_STATUS_RETRIES = 10; 148 149 /* Time in ms to wait for a CP2112_DATA_READ_RESPONSE or 150 CP2112_TRANSFER_STATUS_RESPONSE. */ 151 static const int RESPONSE_TIMEOUT = 50; 152 153 static const struct hid_device_id cp2112_devices[] = { 154 { HID_USB_DEVICE(USB_VENDOR_ID_CYGNAL, USB_DEVICE_ID_CYGNAL_CP2112) }, 155 { } 156 }; 157 MODULE_DEVICE_TABLE(hid, cp2112_devices); 158 159 struct cp2112_device { 160 struct i2c_adapter adap; 161 struct hid_device *hdev; 162 wait_queue_head_t wait; 163 u8 read_data[61]; 164 u8 read_length; 165 u8 hwversion; 166 int xfer_status; 167 atomic_t read_avail; 168 atomic_t xfer_avail; 169 struct gpio_chip gc; 170 u8 *in_out_buffer; 171 struct mutex lock; 172 173 bool gpio_poll; 174 struct delayed_work gpio_poll_worker; 175 unsigned long irq_mask; 176 u8 gpio_prev_state; 177 }; 178 179 static int gpio_push_pull = CP2112_GPIO_ALL_GPIO_MASK; 180 module_param(gpio_push_pull, int, 0644); 181 MODULE_PARM_DESC(gpio_push_pull, "GPIO push-pull configuration bitmask"); 182 183 static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset) 184 { 185 struct cp2112_device *dev = gpiochip_get_data(chip); 186 struct hid_device *hdev = dev->hdev; 187 u8 *buf = dev->in_out_buffer; 188 int ret; 189 190 guard(mutex)(&dev->lock); 191 192 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, 193 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, 194 HID_REQ_GET_REPORT); 195 if (ret != CP2112_GPIO_CONFIG_LENGTH) { 196 hid_err(hdev, "error requesting GPIO config: %d\n", ret); 197 if (ret >= 0) 198 ret = -EIO; 199 return ret; 200 } 201 202 buf[1] &= ~BIT(offset); 203 buf[2] = gpio_push_pull; 204 205 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, 206 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, 207 HID_REQ_SET_REPORT); 208 if (ret != CP2112_GPIO_CONFIG_LENGTH) { 209 hid_err(hdev, "error setting GPIO config: %d\n", ret); 210 if (ret >= 0) 211 ret = -EIO; 212 return ret; 213 } 214 215 return 0; 216 } 217 218 static int cp2112_gpio_set_unlocked(struct cp2112_device *dev, 219 unsigned int offset, int value) 220 { 221 struct hid_device *hdev = dev->hdev; 222 u8 *buf = dev->in_out_buffer; 223 int ret; 224 225 buf[0] = CP2112_GPIO_SET; 226 buf[1] = value ? CP2112_GPIO_ALL_GPIO_MASK : 0; 227 buf[2] = BIT(offset); 228 229 ret = hid_hw_raw_request(hdev, CP2112_GPIO_SET, buf, 230 CP2112_GPIO_SET_LENGTH, HID_FEATURE_REPORT, 231 HID_REQ_SET_REPORT); 232 if (ret < 0) 233 hid_err(hdev, "error setting GPIO values: %d\n", ret); 234 235 return ret; 236 } 237 238 static int cp2112_gpio_set(struct gpio_chip *chip, unsigned int offset, 239 int value) 240 { 241 struct cp2112_device *dev = gpiochip_get_data(chip); 242 243 guard(mutex)(&dev->lock); 244 245 return cp2112_gpio_set_unlocked(dev, offset, value); 246 } 247 248 static int cp2112_gpio_get_all(struct gpio_chip *chip) 249 { 250 struct cp2112_device *dev = gpiochip_get_data(chip); 251 struct hid_device *hdev = dev->hdev; 252 u8 *buf = dev->in_out_buffer; 253 int ret; 254 255 guard(mutex)(&dev->lock); 256 257 ret = hid_hw_raw_request(hdev, CP2112_GPIO_GET, buf, 258 CP2112_GPIO_GET_LENGTH, HID_FEATURE_REPORT, 259 HID_REQ_GET_REPORT); 260 if (ret != CP2112_GPIO_GET_LENGTH) { 261 hid_err(hdev, "error requesting GPIO values: %d\n", ret); 262 return ret < 0 ? ret : -EIO; 263 } 264 265 return buf[1]; 266 } 267 268 static int cp2112_gpio_get(struct gpio_chip *chip, unsigned int offset) 269 { 270 int ret; 271 272 ret = cp2112_gpio_get_all(chip); 273 if (ret < 0) 274 return ret; 275 276 return (ret >> offset) & 1; 277 } 278 279 static int cp2112_gpio_direction_output(struct gpio_chip *chip, 280 unsigned offset, int value) 281 { 282 struct cp2112_device *dev = gpiochip_get_data(chip); 283 struct hid_device *hdev = dev->hdev; 284 u8 *buf = dev->in_out_buffer; 285 int ret; 286 287 guard(mutex)(&dev->lock); 288 289 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, 290 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, 291 HID_REQ_GET_REPORT); 292 if (ret != CP2112_GPIO_CONFIG_LENGTH) { 293 hid_err(hdev, "error requesting GPIO config: %d\n", ret); 294 return ret < 0 ? ret : -EIO; 295 } 296 297 buf[1] |= 1 << offset; 298 buf[2] = gpio_push_pull; 299 300 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, 301 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, 302 HID_REQ_SET_REPORT); 303 if (ret < 0) { 304 hid_err(hdev, "error setting GPIO config: %d\n", ret); 305 return ret; 306 } 307 308 /* 309 * Set gpio value when output direction is already set, 310 * as specified in AN495, Rev. 0.2, cpt. 4.4 311 */ 312 cp2112_gpio_set_unlocked(dev, offset, value); 313 314 return 0; 315 } 316 317 static int cp2112_hid_get(struct hid_device *hdev, unsigned char report_number, 318 u8 *data, size_t count, unsigned char report_type) 319 { 320 u8 *buf; 321 int ret; 322 323 buf = kmalloc(count, GFP_KERNEL); 324 if (!buf) 325 return -ENOMEM; 326 327 ret = hid_hw_raw_request(hdev, report_number, buf, count, 328 report_type, HID_REQ_GET_REPORT); 329 memcpy(data, buf, count); 330 kfree(buf); 331 return ret; 332 } 333 334 static int cp2112_hid_output(struct hid_device *hdev, u8 *data, size_t count, 335 unsigned char report_type) 336 { 337 u8 *buf; 338 int ret; 339 340 buf = kmemdup(data, count, GFP_KERNEL); 341 if (!buf) 342 return -ENOMEM; 343 344 if (report_type == HID_OUTPUT_REPORT) 345 ret = hid_hw_output_report(hdev, buf, count); 346 else 347 ret = hid_hw_raw_request(hdev, buf[0], buf, count, report_type, 348 HID_REQ_SET_REPORT); 349 350 kfree(buf); 351 return ret; 352 } 353 354 static int cp2112_wait(struct cp2112_device *dev, atomic_t *avail) 355 { 356 int ret = 0; 357 358 /* We have sent either a CP2112_TRANSFER_STATUS_REQUEST or a 359 * CP2112_DATA_READ_FORCE_SEND and we are waiting for the response to 360 * come in cp2112_raw_event or timeout. There will only be one of these 361 * in flight at any one time. The timeout is extremely large and is a 362 * last resort if the CP2112 has died. If we do timeout we don't expect 363 * to receive the response which would cause data races, it's not like 364 * we can do anything about it anyway. 365 */ 366 ret = wait_event_interruptible_timeout(dev->wait, 367 atomic_read(avail), msecs_to_jiffies(RESPONSE_TIMEOUT)); 368 if (-ERESTARTSYS == ret) 369 return ret; 370 if (!ret) 371 return -ETIMEDOUT; 372 373 atomic_set(avail, 0); 374 return 0; 375 } 376 377 static int cp2112_xfer_status(struct cp2112_device *dev) 378 { 379 struct hid_device *hdev = dev->hdev; 380 u8 buf[2]; 381 int ret; 382 383 buf[0] = CP2112_TRANSFER_STATUS_REQUEST; 384 buf[1] = 0x01; 385 atomic_set(&dev->xfer_avail, 0); 386 387 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); 388 if (ret < 0) { 389 hid_warn(hdev, "Error requesting status: %d\n", ret); 390 return ret; 391 } 392 393 ret = cp2112_wait(dev, &dev->xfer_avail); 394 if (ret) 395 return ret; 396 397 return dev->xfer_status; 398 } 399 400 static int cp2112_read(struct cp2112_device *dev, u8 *data, size_t size) 401 { 402 struct hid_device *hdev = dev->hdev; 403 struct cp2112_force_read_report report; 404 int ret; 405 406 if (size > sizeof(dev->read_data)) 407 size = sizeof(dev->read_data); 408 report.report = CP2112_DATA_READ_FORCE_SEND; 409 report.length = cpu_to_be16(size); 410 411 atomic_set(&dev->read_avail, 0); 412 413 ret = cp2112_hid_output(hdev, &report.report, sizeof(report), 414 HID_OUTPUT_REPORT); 415 if (ret < 0) { 416 hid_warn(hdev, "Error requesting data: %d\n", ret); 417 return ret; 418 } 419 420 ret = cp2112_wait(dev, &dev->read_avail); 421 if (ret) 422 return ret; 423 424 hid_dbg(hdev, "read %d of %zd bytes requested\n", 425 dev->read_length, size); 426 427 if (size > dev->read_length) 428 size = dev->read_length; 429 430 memcpy(data, dev->read_data, size); 431 return dev->read_length; 432 } 433 434 static int cp2112_read_req(void *buf, u8 slave_address, u16 length) 435 { 436 struct cp2112_read_req_report *report = buf; 437 438 if (length < 1 || length > 512) 439 return -EINVAL; 440 441 report->report = CP2112_DATA_READ_REQUEST; 442 report->slave_address = slave_address << 1; 443 report->length = cpu_to_be16(length); 444 return sizeof(*report); 445 } 446 447 static int cp2112_write_read_req(void *buf, u8 slave_address, u16 length, 448 u8 command, u8 *data, u8 data_length) 449 { 450 struct cp2112_write_read_req_report *report = buf; 451 452 if (length < 1 || length > 512 453 || data_length > sizeof(report->target_address) - 1) 454 return -EINVAL; 455 456 report->report = CP2112_DATA_WRITE_READ_REQUEST; 457 report->slave_address = slave_address << 1; 458 report->length = cpu_to_be16(length); 459 report->target_address_length = data_length + 1; 460 report->target_address[0] = command; 461 memcpy(&report->target_address[1], data, data_length); 462 return data_length + 6; 463 } 464 465 static int cp2112_write_req(void *buf, u8 slave_address, u8 command, u8 *data, 466 u8 data_length) 467 { 468 struct cp2112_write_req_report *report = buf; 469 470 if (data_length > sizeof(report->data) - 1) 471 return -EINVAL; 472 473 report->report = CP2112_DATA_WRITE_REQUEST; 474 report->slave_address = slave_address << 1; 475 report->length = data_length + 1; 476 report->data[0] = command; 477 memcpy(&report->data[1], data, data_length); 478 return data_length + 4; 479 } 480 481 static int cp2112_i2c_write_req(void *buf, u8 slave_address, u8 *data, 482 u8 data_length) 483 { 484 struct cp2112_write_req_report *report = buf; 485 486 if (data_length > sizeof(report->data)) 487 return -EINVAL; 488 489 report->report = CP2112_DATA_WRITE_REQUEST; 490 report->slave_address = slave_address << 1; 491 report->length = data_length; 492 memcpy(report->data, data, data_length); 493 return data_length + 3; 494 } 495 496 static int cp2112_i2c_write_read_req(void *buf, u8 slave_address, 497 u8 *addr, int addr_length, 498 int read_length) 499 { 500 struct cp2112_write_read_req_report *report = buf; 501 502 if (read_length < 1 || read_length > 512 || 503 addr_length > sizeof(report->target_address)) 504 return -EINVAL; 505 506 report->report = CP2112_DATA_WRITE_READ_REQUEST; 507 report->slave_address = slave_address << 1; 508 report->length = cpu_to_be16(read_length); 509 report->target_address_length = addr_length; 510 memcpy(report->target_address, addr, addr_length); 511 return addr_length + 5; 512 } 513 514 static int cp2112_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, 515 int num) 516 { 517 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; 518 struct hid_device *hdev = dev->hdev; 519 u8 buf[64]; 520 ssize_t count; 521 ssize_t read_length = 0; 522 u8 *read_buf = NULL; 523 unsigned int retries; 524 int ret; 525 526 hid_dbg(hdev, "I2C %d messages\n", num); 527 528 if (num == 1) { 529 hid_dbg(hdev, "I2C %s %#04x len %d\n", 530 str_read_write(msgs->flags & I2C_M_RD), msgs->addr, msgs->len); 531 if (msgs->flags & I2C_M_RD) { 532 read_length = msgs->len; 533 read_buf = msgs->buf; 534 count = cp2112_read_req(buf, msgs->addr, msgs->len); 535 } else { 536 count = cp2112_i2c_write_req(buf, msgs->addr, 537 msgs->buf, msgs->len); 538 } 539 if (count < 0) 540 return count; 541 } else if (dev->hwversion > 1 && /* no repeated start in rev 1 */ 542 num == 2 && 543 msgs[0].addr == msgs[1].addr && 544 !(msgs[0].flags & I2C_M_RD) && (msgs[1].flags & I2C_M_RD)) { 545 hid_dbg(hdev, "I2C write-read %#04x wlen %d rlen %d\n", 546 msgs[0].addr, msgs[0].len, msgs[1].len); 547 read_length = msgs[1].len; 548 read_buf = msgs[1].buf; 549 count = cp2112_i2c_write_read_req(buf, msgs[0].addr, 550 msgs[0].buf, msgs[0].len, msgs[1].len); 551 if (count < 0) 552 return count; 553 } else { 554 hid_err(hdev, 555 "Multi-message I2C transactions not supported\n"); 556 return -EOPNOTSUPP; 557 } 558 559 ret = hid_hw_power(hdev, PM_HINT_FULLON); 560 if (ret < 0) { 561 hid_err(hdev, "power management error: %d\n", ret); 562 return ret; 563 } 564 565 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); 566 if (ret < 0) { 567 hid_warn(hdev, "Error starting transaction: %d\n", ret); 568 goto power_normal; 569 } 570 571 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { 572 ret = cp2112_xfer_status(dev); 573 if (-EBUSY == ret) 574 continue; 575 if (ret < 0) 576 goto power_normal; 577 break; 578 } 579 580 if (XFER_STATUS_RETRIES <= retries) { 581 hid_warn(hdev, "Transfer timed out, cancelling.\n"); 582 buf[0] = CP2112_CANCEL_TRANSFER; 583 buf[1] = 0x01; 584 585 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); 586 if (ret < 0) 587 hid_warn(hdev, "Error cancelling transaction: %d\n", 588 ret); 589 590 ret = -ETIMEDOUT; 591 goto power_normal; 592 } 593 594 for (count = 0; count < read_length;) { 595 ret = cp2112_read(dev, read_buf + count, read_length - count); 596 if (ret < 0) 597 goto power_normal; 598 if (ret == 0) { 599 hid_err(hdev, "read returned 0\n"); 600 ret = -EIO; 601 goto power_normal; 602 } 603 count += ret; 604 if (count > read_length) { 605 /* 606 * The hardware returned too much data. 607 * This is mostly harmless because cp2112_read() 608 * has a limit check so didn't overrun our 609 * buffer. Nevertheless, we return an error 610 * because something is seriously wrong and 611 * it shouldn't go unnoticed. 612 */ 613 hid_err(hdev, "long read: %d > %zd\n", 614 ret, read_length - count + ret); 615 ret = -EIO; 616 goto power_normal; 617 } 618 } 619 620 /* return the number of transferred messages */ 621 ret = num; 622 623 power_normal: 624 hid_hw_power(hdev, PM_HINT_NORMAL); 625 hid_dbg(hdev, "I2C transfer finished: %d\n", ret); 626 return ret; 627 } 628 629 static int cp2112_xfer(struct i2c_adapter *adap, u16 addr, 630 unsigned short flags, char read_write, u8 command, 631 int size, union i2c_smbus_data *data) 632 { 633 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; 634 struct hid_device *hdev = dev->hdev; 635 u8 buf[64]; 636 __le16 word; 637 ssize_t count; 638 size_t read_length = 0; 639 unsigned int retries; 640 int ret; 641 642 hid_dbg(hdev, "%s addr 0x%x flags 0x%x cmd 0x%x size %d\n", 643 str_write_read(read_write == I2C_SMBUS_WRITE), 644 addr, flags, command, size); 645 646 switch (size) { 647 case I2C_SMBUS_BYTE: 648 read_length = 1; 649 650 if (I2C_SMBUS_READ == read_write) 651 count = cp2112_read_req(buf, addr, read_length); 652 else 653 count = cp2112_write_req(buf, addr, command, NULL, 654 0); 655 break; 656 case I2C_SMBUS_BYTE_DATA: 657 read_length = 1; 658 659 if (I2C_SMBUS_READ == read_write) 660 count = cp2112_write_read_req(buf, addr, read_length, 661 command, NULL, 0); 662 else 663 count = cp2112_write_req(buf, addr, command, 664 &data->byte, 1); 665 break; 666 case I2C_SMBUS_WORD_DATA: 667 read_length = 2; 668 word = cpu_to_le16(data->word); 669 670 if (I2C_SMBUS_READ == read_write) 671 count = cp2112_write_read_req(buf, addr, read_length, 672 command, NULL, 0); 673 else 674 count = cp2112_write_req(buf, addr, command, 675 (u8 *)&word, 2); 676 break; 677 case I2C_SMBUS_PROC_CALL: 678 size = I2C_SMBUS_WORD_DATA; 679 read_write = I2C_SMBUS_READ; 680 read_length = 2; 681 word = cpu_to_le16(data->word); 682 683 count = cp2112_write_read_req(buf, addr, read_length, command, 684 (u8 *)&word, 2); 685 break; 686 case I2C_SMBUS_I2C_BLOCK_DATA: 687 if (read_write == I2C_SMBUS_READ) { 688 read_length = data->block[0]; 689 count = cp2112_write_read_req(buf, addr, read_length, 690 command, NULL, 0); 691 } else { 692 count = cp2112_write_req(buf, addr, command, 693 data->block + 1, 694 data->block[0]); 695 } 696 break; 697 case I2C_SMBUS_BLOCK_DATA: 698 if (I2C_SMBUS_READ == read_write) { 699 count = cp2112_write_read_req(buf, addr, 700 I2C_SMBUS_BLOCK_MAX, 701 command, NULL, 0); 702 } else { 703 count = cp2112_write_req(buf, addr, command, 704 data->block, 705 data->block[0] + 1); 706 } 707 break; 708 case I2C_SMBUS_BLOCK_PROC_CALL: 709 size = I2C_SMBUS_BLOCK_DATA; 710 read_write = I2C_SMBUS_READ; 711 712 count = cp2112_write_read_req(buf, addr, I2C_SMBUS_BLOCK_MAX, 713 command, data->block, 714 data->block[0] + 1); 715 break; 716 default: 717 hid_warn(hdev, "Unsupported transaction %d\n", size); 718 return -EOPNOTSUPP; 719 } 720 721 if (count < 0) 722 return count; 723 724 ret = hid_hw_power(hdev, PM_HINT_FULLON); 725 if (ret < 0) { 726 hid_err(hdev, "power management error: %d\n", ret); 727 return ret; 728 } 729 730 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); 731 if (ret < 0) { 732 hid_warn(hdev, "Error starting transaction: %d\n", ret); 733 goto power_normal; 734 } 735 736 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { 737 ret = cp2112_xfer_status(dev); 738 if (-EBUSY == ret) 739 continue; 740 if (ret < 0) 741 goto power_normal; 742 break; 743 } 744 745 if (XFER_STATUS_RETRIES <= retries) { 746 hid_warn(hdev, "Transfer timed out, cancelling.\n"); 747 buf[0] = CP2112_CANCEL_TRANSFER; 748 buf[1] = 0x01; 749 750 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); 751 if (ret < 0) 752 hid_warn(hdev, "Error cancelling transaction: %d\n", 753 ret); 754 755 ret = -ETIMEDOUT; 756 goto power_normal; 757 } 758 759 if (I2C_SMBUS_WRITE == read_write) { 760 ret = 0; 761 goto power_normal; 762 } 763 764 if (I2C_SMBUS_BLOCK_DATA == size) 765 read_length = ret; 766 767 ret = cp2112_read(dev, buf, read_length); 768 if (ret < 0) 769 goto power_normal; 770 if (ret != read_length) { 771 hid_warn(hdev, "short read: %d < %zd\n", ret, read_length); 772 ret = -EIO; 773 goto power_normal; 774 } 775 776 switch (size) { 777 case I2C_SMBUS_BYTE: 778 case I2C_SMBUS_BYTE_DATA: 779 data->byte = buf[0]; 780 break; 781 case I2C_SMBUS_WORD_DATA: 782 data->word = le16_to_cpup((__le16 *)buf); 783 break; 784 case I2C_SMBUS_I2C_BLOCK_DATA: 785 if (read_length > I2C_SMBUS_BLOCK_MAX) { 786 ret = -EINVAL; 787 goto power_normal; 788 } 789 790 memcpy(data->block + 1, buf, read_length); 791 break; 792 case I2C_SMBUS_BLOCK_DATA: 793 if (read_length > I2C_SMBUS_BLOCK_MAX) { 794 ret = -EPROTO; 795 goto power_normal; 796 } 797 798 memcpy(data->block, buf, read_length); 799 break; 800 } 801 802 ret = 0; 803 power_normal: 804 hid_hw_power(hdev, PM_HINT_NORMAL); 805 hid_dbg(hdev, "transfer finished: %d\n", ret); 806 return ret; 807 } 808 809 static u32 cp2112_functionality(struct i2c_adapter *adap) 810 { 811 return I2C_FUNC_I2C | 812 I2C_FUNC_SMBUS_BYTE | 813 I2C_FUNC_SMBUS_BYTE_DATA | 814 I2C_FUNC_SMBUS_WORD_DATA | 815 I2C_FUNC_SMBUS_BLOCK_DATA | 816 I2C_FUNC_SMBUS_I2C_BLOCK | 817 I2C_FUNC_SMBUS_PROC_CALL | 818 I2C_FUNC_SMBUS_BLOCK_PROC_CALL; 819 } 820 821 static const struct i2c_algorithm smbus_algorithm = { 822 .master_xfer = cp2112_i2c_xfer, 823 .smbus_xfer = cp2112_xfer, 824 .functionality = cp2112_functionality, 825 }; 826 827 static int cp2112_get_usb_config(struct hid_device *hdev, 828 struct cp2112_usb_config_report *cfg) 829 { 830 int ret; 831 832 ret = cp2112_hid_get(hdev, CP2112_USB_CONFIG, (u8 *)cfg, sizeof(*cfg), 833 HID_FEATURE_REPORT); 834 if (ret != sizeof(*cfg)) { 835 hid_err(hdev, "error reading usb config: %d\n", ret); 836 if (ret < 0) 837 return ret; 838 return -EIO; 839 } 840 841 return 0; 842 } 843 844 static int cp2112_set_usb_config(struct hid_device *hdev, 845 struct cp2112_usb_config_report *cfg) 846 { 847 int ret; 848 849 if (WARN_ON(cfg->report != CP2112_USB_CONFIG)) 850 return -EINVAL; 851 852 ret = cp2112_hid_output(hdev, (u8 *)cfg, sizeof(*cfg), 853 HID_FEATURE_REPORT); 854 if (ret != sizeof(*cfg)) { 855 hid_err(hdev, "error writing usb config: %d\n", ret); 856 if (ret < 0) 857 return ret; 858 return -EIO; 859 } 860 861 return 0; 862 } 863 864 static void chmod_sysfs_attrs(struct hid_device *hdev); 865 866 #define CP2112_CONFIG_ATTR(name, store, format, ...) \ 867 static ssize_t name##_store(struct device *kdev, \ 868 struct device_attribute *attr, const char *buf, \ 869 size_t count) \ 870 { \ 871 struct hid_device *hdev = to_hid_device(kdev); \ 872 struct cp2112_usb_config_report cfg; \ 873 int ret = cp2112_get_usb_config(hdev, &cfg); \ 874 if (ret) \ 875 return ret; \ 876 store; \ 877 ret = cp2112_set_usb_config(hdev, &cfg); \ 878 if (ret) \ 879 return ret; \ 880 chmod_sysfs_attrs(hdev); \ 881 return count; \ 882 } \ 883 static ssize_t name##_show(struct device *kdev, \ 884 struct device_attribute *attr, char *buf) \ 885 { \ 886 struct hid_device *hdev = to_hid_device(kdev); \ 887 struct cp2112_usb_config_report cfg; \ 888 int ret = cp2112_get_usb_config(hdev, &cfg); \ 889 if (ret) \ 890 return ret; \ 891 return sysfs_emit(buf, format, ##__VA_ARGS__); \ 892 } \ 893 static DEVICE_ATTR_RW(name); 894 895 CP2112_CONFIG_ATTR(vendor_id, ({ 896 u16 vid; 897 898 if (sscanf(buf, "%hi", &vid) != 1) 899 return -EINVAL; 900 901 cfg.vid = cpu_to_le16(vid); 902 cfg.mask = 0x01; 903 }), "0x%04x\n", le16_to_cpu(cfg.vid)); 904 905 CP2112_CONFIG_ATTR(product_id, ({ 906 u16 pid; 907 908 if (sscanf(buf, "%hi", &pid) != 1) 909 return -EINVAL; 910 911 cfg.pid = cpu_to_le16(pid); 912 cfg.mask = 0x02; 913 }), "0x%04x\n", le16_to_cpu(cfg.pid)); 914 915 CP2112_CONFIG_ATTR(max_power, ({ 916 int mA; 917 918 if (sscanf(buf, "%i", &mA) != 1) 919 return -EINVAL; 920 921 cfg.max_power = (mA + 1) / 2; 922 cfg.mask = 0x04; 923 }), "%u mA\n", cfg.max_power * 2); 924 925 CP2112_CONFIG_ATTR(power_mode, ({ 926 if (sscanf(buf, "%hhi", &cfg.power_mode) != 1) 927 return -EINVAL; 928 929 cfg.mask = 0x08; 930 }), "%u\n", cfg.power_mode); 931 932 CP2112_CONFIG_ATTR(release_version, ({ 933 if (sscanf(buf, "%hhi.%hhi", &cfg.release_major, &cfg.release_minor) 934 != 2) 935 return -EINVAL; 936 937 cfg.mask = 0x10; 938 }), "%u.%u\n", cfg.release_major, cfg.release_minor); 939 940 #undef CP2112_CONFIG_ATTR 941 942 static ssize_t pstr_store(struct device *kdev, struct device_attribute *kattr, 943 const char *buf, size_t count, int number) 944 { 945 struct hid_device *hdev = to_hid_device(kdev); 946 struct cp2112_string_report report; 947 int ret; 948 949 memset(&report, 0, sizeof(report)); 950 951 ret = utf8s_to_utf16s(buf, count, UTF16_LITTLE_ENDIAN, 952 report.string, ARRAY_SIZE(report.string)); 953 report.report = number; 954 report.length = ret * sizeof(report.string[0]) + 2; 955 report.type = USB_DT_STRING; 956 957 ret = cp2112_hid_output(hdev, &report.report, report.length + 1, 958 HID_FEATURE_REPORT); 959 if (ret != report.length + 1) { 960 hid_err(hdev, "error writing %s string: %d\n", kattr->attr.name, 961 ret); 962 if (ret < 0) 963 return ret; 964 return -EIO; 965 } 966 967 chmod_sysfs_attrs(hdev); 968 return count; 969 } 970 971 static ssize_t pstr_show(struct device *kdev, struct device_attribute *kattr, 972 char *buf, int number) 973 { 974 struct hid_device *hdev = to_hid_device(kdev); 975 struct cp2112_string_report report; 976 u8 length; 977 int ret; 978 979 ret = cp2112_hid_get(hdev, number, (u8 *)&report.contents, 980 sizeof(report.contents), HID_FEATURE_REPORT); 981 if (ret < 3) { 982 hid_err(hdev, "error reading %s string: %d\n", kattr->attr.name, 983 ret); 984 if (ret < 0) 985 return ret; 986 return -EIO; 987 } 988 989 if (report.length < 2) { 990 hid_err(hdev, "invalid %s string length: %d\n", 991 kattr->attr.name, report.length); 992 return -EIO; 993 } 994 995 length = report.length > ret - 1 ? ret - 1 : report.length; 996 length = (length - 2) / sizeof(report.string[0]); 997 ret = utf16s_to_utf8s(report.string, length, UTF16_LITTLE_ENDIAN, buf, 998 PAGE_SIZE - 1); 999 buf[ret++] = '\n'; 1000 return ret; 1001 } 1002 1003 #define CP2112_PSTR_ATTR(name, _report) \ 1004 static ssize_t name##_store(struct device *kdev, struct device_attribute *kattr, \ 1005 const char *buf, size_t count) \ 1006 { \ 1007 return pstr_store(kdev, kattr, buf, count, _report); \ 1008 } \ 1009 static ssize_t name##_show(struct device *kdev, struct device_attribute *kattr, char *buf) \ 1010 { \ 1011 return pstr_show(kdev, kattr, buf, _report); \ 1012 } \ 1013 static DEVICE_ATTR_RW(name); 1014 1015 CP2112_PSTR_ATTR(manufacturer, CP2112_MANUFACTURER_STRING); 1016 CP2112_PSTR_ATTR(product, CP2112_PRODUCT_STRING); 1017 CP2112_PSTR_ATTR(serial, CP2112_SERIAL_STRING); 1018 1019 #undef CP2112_PSTR_ATTR 1020 1021 static const struct attribute_group cp2112_attr_group = { 1022 .attrs = (struct attribute *[]){ 1023 &dev_attr_vendor_id.attr, 1024 &dev_attr_product_id.attr, 1025 &dev_attr_max_power.attr, 1026 &dev_attr_power_mode.attr, 1027 &dev_attr_release_version.attr, 1028 &dev_attr_manufacturer.attr, 1029 &dev_attr_product.attr, 1030 &dev_attr_serial.attr, 1031 NULL 1032 } 1033 }; 1034 1035 /* Chmoding our sysfs attributes is simply a way to expose which fields in the 1036 * PROM have already been programmed. We do not depend on this preventing 1037 * writing to these attributes since the CP2112 will simply ignore writes to 1038 * already-programmed fields. This is why there is no sense in fixing this 1039 * racy behaviour. 1040 */ 1041 static void chmod_sysfs_attrs(struct hid_device *hdev) 1042 { 1043 struct attribute **attr; 1044 u8 buf[2]; 1045 int ret; 1046 1047 ret = cp2112_hid_get(hdev, CP2112_LOCK_BYTE, buf, sizeof(buf), 1048 HID_FEATURE_REPORT); 1049 if (ret != sizeof(buf)) { 1050 hid_err(hdev, "error reading lock byte: %d\n", ret); 1051 return; 1052 } 1053 1054 for (attr = cp2112_attr_group.attrs; *attr; ++attr) { 1055 umode_t mode = (buf[1] & 1) ? 0644 : 0444; 1056 ret = sysfs_chmod_file(&hdev->dev.kobj, *attr, mode); 1057 if (ret < 0) 1058 hid_err(hdev, "error chmoding sysfs file %s\n", 1059 (*attr)->name); 1060 buf[1] >>= 1; 1061 } 1062 } 1063 1064 static void cp2112_gpio_irq_ack(struct irq_data *d) 1065 { 1066 } 1067 1068 static void cp2112_gpio_irq_mask(struct irq_data *d) 1069 { 1070 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1071 struct cp2112_device *dev = gpiochip_get_data(gc); 1072 irq_hw_number_t hwirq = irqd_to_hwirq(d); 1073 1074 __clear_bit(hwirq, &dev->irq_mask); 1075 gpiochip_disable_irq(gc, hwirq); 1076 } 1077 1078 static void cp2112_gpio_irq_unmask(struct irq_data *d) 1079 { 1080 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1081 struct cp2112_device *dev = gpiochip_get_data(gc); 1082 irq_hw_number_t hwirq = irqd_to_hwirq(d); 1083 1084 gpiochip_enable_irq(gc, hwirq); 1085 __set_bit(hwirq, &dev->irq_mask); 1086 } 1087 1088 static void cp2112_gpio_poll_callback(struct work_struct *work) 1089 { 1090 struct cp2112_device *dev = container_of(work, struct cp2112_device, 1091 gpio_poll_worker.work); 1092 u8 gpio_mask; 1093 u32 irq_type; 1094 int irq, virq, ret; 1095 1096 ret = cp2112_gpio_get_all(&dev->gc); 1097 if (ret == -ENODEV) /* the hardware has been disconnected */ 1098 return; 1099 if (ret < 0) 1100 goto exit; 1101 1102 gpio_mask = ret; 1103 for_each_set_bit(virq, &dev->irq_mask, CP2112_GPIO_MAX_GPIO) { 1104 irq = irq_find_mapping(dev->gc.irq.domain, virq); 1105 if (!irq) 1106 continue; 1107 1108 irq_type = irq_get_trigger_type(irq); 1109 if (!irq_type) 1110 continue; 1111 1112 if (gpio_mask & BIT(virq)) { 1113 /* Level High */ 1114 1115 if (irq_type & IRQ_TYPE_LEVEL_HIGH) 1116 handle_nested_irq(irq); 1117 1118 if ((irq_type & IRQ_TYPE_EDGE_RISING) && 1119 !(dev->gpio_prev_state & BIT(virq))) 1120 handle_nested_irq(irq); 1121 } else { 1122 /* Level Low */ 1123 1124 if (irq_type & IRQ_TYPE_LEVEL_LOW) 1125 handle_nested_irq(irq); 1126 1127 if ((irq_type & IRQ_TYPE_EDGE_FALLING) && 1128 (dev->gpio_prev_state & BIT(virq))) 1129 handle_nested_irq(irq); 1130 } 1131 } 1132 1133 dev->gpio_prev_state = gpio_mask; 1134 1135 exit: 1136 if (dev->gpio_poll) 1137 schedule_delayed_work(&dev->gpio_poll_worker, 10); 1138 } 1139 1140 1141 static unsigned int cp2112_gpio_irq_startup(struct irq_data *d) 1142 { 1143 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1144 struct cp2112_device *dev = gpiochip_get_data(gc); 1145 1146 if (!dev->gpio_poll) { 1147 dev->gpio_poll = true; 1148 schedule_delayed_work(&dev->gpio_poll_worker, 0); 1149 } 1150 1151 cp2112_gpio_irq_unmask(d); 1152 return 0; 1153 } 1154 1155 static void cp2112_gpio_irq_shutdown(struct irq_data *d) 1156 { 1157 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1158 struct cp2112_device *dev = gpiochip_get_data(gc); 1159 1160 cp2112_gpio_irq_mask(d); 1161 1162 if (!dev->irq_mask) { 1163 dev->gpio_poll = false; 1164 cancel_delayed_work_sync(&dev->gpio_poll_worker); 1165 } 1166 } 1167 1168 static int cp2112_gpio_irq_type(struct irq_data *d, unsigned int type) 1169 { 1170 return 0; 1171 } 1172 1173 static const struct irq_chip cp2112_gpio_irqchip = { 1174 .name = "cp2112-gpio", 1175 .irq_startup = cp2112_gpio_irq_startup, 1176 .irq_shutdown = cp2112_gpio_irq_shutdown, 1177 .irq_ack = cp2112_gpio_irq_ack, 1178 .irq_mask = cp2112_gpio_irq_mask, 1179 .irq_unmask = cp2112_gpio_irq_unmask, 1180 .irq_set_type = cp2112_gpio_irq_type, 1181 .flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE, 1182 GPIOCHIP_IRQ_RESOURCE_HELPERS, 1183 }; 1184 1185 static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id) 1186 { 1187 struct cp2112_device *dev; 1188 u8 buf[3]; 1189 struct cp2112_smbus_config_report config; 1190 struct gpio_irq_chip *girq; 1191 int ret; 1192 1193 dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL); 1194 if (!dev) 1195 return -ENOMEM; 1196 1197 dev->in_out_buffer = devm_kzalloc(&hdev->dev, CP2112_REPORT_MAX_LENGTH, 1198 GFP_KERNEL); 1199 if (!dev->in_out_buffer) 1200 return -ENOMEM; 1201 1202 ret = devm_mutex_init(&hdev->dev, &dev->lock); 1203 if (ret) { 1204 hid_err(hdev, "mutex init failed\n"); 1205 return ret; 1206 } 1207 1208 ret = hid_parse(hdev); 1209 if (ret) { 1210 hid_err(hdev, "parse failed\n"); 1211 return ret; 1212 } 1213 1214 ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW); 1215 if (ret) { 1216 hid_err(hdev, "hw start failed\n"); 1217 return ret; 1218 } 1219 1220 ret = hid_hw_open(hdev); 1221 if (ret) { 1222 hid_err(hdev, "hw open failed\n"); 1223 goto err_hid_stop; 1224 } 1225 1226 ret = hid_hw_power(hdev, PM_HINT_FULLON); 1227 if (ret < 0) { 1228 hid_err(hdev, "power management error: %d\n", ret); 1229 goto err_hid_close; 1230 } 1231 1232 ret = cp2112_hid_get(hdev, CP2112_GET_VERSION_INFO, buf, sizeof(buf), 1233 HID_FEATURE_REPORT); 1234 if (ret != sizeof(buf)) { 1235 hid_err(hdev, "error requesting version\n"); 1236 if (ret >= 0) 1237 ret = -EIO; 1238 goto err_power_normal; 1239 } 1240 1241 hid_info(hdev, "Part Number: 0x%02X Device Version: 0x%02X\n", 1242 buf[1], buf[2]); 1243 1244 ret = cp2112_hid_get(hdev, CP2112_SMBUS_CONFIG, (u8 *)&config, 1245 sizeof(config), HID_FEATURE_REPORT); 1246 if (ret != sizeof(config)) { 1247 hid_err(hdev, "error requesting SMBus config\n"); 1248 if (ret >= 0) 1249 ret = -EIO; 1250 goto err_power_normal; 1251 } 1252 1253 config.retry_time = cpu_to_be16(1); 1254 1255 ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config), 1256 HID_FEATURE_REPORT); 1257 if (ret != sizeof(config)) { 1258 hid_err(hdev, "error setting SMBus config\n"); 1259 if (ret >= 0) 1260 ret = -EIO; 1261 goto err_power_normal; 1262 } 1263 1264 hid_set_drvdata(hdev, (void *)dev); 1265 dev->hdev = hdev; 1266 dev->adap.owner = THIS_MODULE; 1267 dev->adap.class = I2C_CLASS_HWMON; 1268 dev->adap.algo = &smbus_algorithm; 1269 dev->adap.algo_data = dev; 1270 dev->adap.dev.parent = &hdev->dev; 1271 snprintf(dev->adap.name, sizeof(dev->adap.name), 1272 "CP2112 SMBus Bridge on hidraw%d", 1273 ((struct hidraw *)hdev->hidraw)->minor); 1274 dev->hwversion = buf[2]; 1275 init_waitqueue_head(&dev->wait); 1276 1277 hid_device_io_start(hdev); 1278 ret = i2c_add_adapter(&dev->adap); 1279 hid_device_io_stop(hdev); 1280 1281 if (ret) { 1282 hid_err(hdev, "error registering i2c adapter\n"); 1283 goto err_power_normal; 1284 } 1285 1286 hid_dbg(hdev, "adapter registered\n"); 1287 1288 dev->gc.label = "cp2112_gpio"; 1289 dev->gc.direction_input = cp2112_gpio_direction_input; 1290 dev->gc.direction_output = cp2112_gpio_direction_output; 1291 dev->gc.set_rv = cp2112_gpio_set; 1292 dev->gc.get = cp2112_gpio_get; 1293 dev->gc.base = -1; 1294 dev->gc.ngpio = CP2112_GPIO_MAX_GPIO; 1295 dev->gc.can_sleep = 1; 1296 dev->gc.parent = &hdev->dev; 1297 1298 girq = &dev->gc.irq; 1299 gpio_irq_chip_set_chip(girq, &cp2112_gpio_irqchip); 1300 /* The event comes from the outside so no parent handler */ 1301 girq->parent_handler = NULL; 1302 girq->num_parents = 0; 1303 girq->parents = NULL; 1304 girq->default_type = IRQ_TYPE_NONE; 1305 girq->handler = handle_simple_irq; 1306 girq->threaded = true; 1307 1308 INIT_DELAYED_WORK(&dev->gpio_poll_worker, cp2112_gpio_poll_callback); 1309 1310 ret = gpiochip_add_data(&dev->gc, dev); 1311 if (ret < 0) { 1312 hid_err(hdev, "error registering gpio chip\n"); 1313 goto err_free_i2c; 1314 } 1315 1316 ret = sysfs_create_group(&hdev->dev.kobj, &cp2112_attr_group); 1317 if (ret < 0) { 1318 hid_err(hdev, "error creating sysfs attrs\n"); 1319 goto err_gpiochip_remove; 1320 } 1321 1322 chmod_sysfs_attrs(hdev); 1323 hid_hw_power(hdev, PM_HINT_NORMAL); 1324 1325 return ret; 1326 1327 err_gpiochip_remove: 1328 gpiochip_remove(&dev->gc); 1329 err_free_i2c: 1330 i2c_del_adapter(&dev->adap); 1331 err_power_normal: 1332 hid_hw_power(hdev, PM_HINT_NORMAL); 1333 err_hid_close: 1334 hid_hw_close(hdev); 1335 err_hid_stop: 1336 hid_hw_stop(hdev); 1337 return ret; 1338 } 1339 1340 static void cp2112_remove(struct hid_device *hdev) 1341 { 1342 struct cp2112_device *dev = hid_get_drvdata(hdev); 1343 1344 sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group); 1345 i2c_del_adapter(&dev->adap); 1346 1347 if (dev->gpio_poll) { 1348 dev->gpio_poll = false; 1349 cancel_delayed_work_sync(&dev->gpio_poll_worker); 1350 } 1351 1352 gpiochip_remove(&dev->gc); 1353 /* i2c_del_adapter has finished removing all i2c devices from our 1354 * adapter. Well behaved devices should no longer call our cp2112_xfer 1355 * and should have waited for any pending calls to finish. It has also 1356 * waited for device_unregister(&adap->dev) to complete. Therefore we 1357 * can safely free our struct cp2112_device. 1358 */ 1359 hid_hw_close(hdev); 1360 hid_hw_stop(hdev); 1361 } 1362 1363 static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report, 1364 u8 *data, int size) 1365 { 1366 struct cp2112_device *dev = hid_get_drvdata(hdev); 1367 struct cp2112_xfer_status_report *xfer = (void *)data; 1368 1369 switch (data[0]) { 1370 case CP2112_TRANSFER_STATUS_RESPONSE: 1371 hid_dbg(hdev, "xfer status: %02x %02x %04x %04x\n", 1372 xfer->status0, xfer->status1, 1373 be16_to_cpu(xfer->retries), be16_to_cpu(xfer->length)); 1374 1375 switch (xfer->status0) { 1376 case STATUS0_IDLE: 1377 dev->xfer_status = -EAGAIN; 1378 break; 1379 case STATUS0_BUSY: 1380 dev->xfer_status = -EBUSY; 1381 break; 1382 case STATUS0_COMPLETE: 1383 dev->xfer_status = be16_to_cpu(xfer->length); 1384 break; 1385 case STATUS0_ERROR: 1386 switch (xfer->status1) { 1387 case STATUS1_TIMEOUT_NACK: 1388 case STATUS1_TIMEOUT_BUS: 1389 dev->xfer_status = -ETIMEDOUT; 1390 break; 1391 default: 1392 dev->xfer_status = -EIO; 1393 break; 1394 } 1395 break; 1396 default: 1397 dev->xfer_status = -EINVAL; 1398 break; 1399 } 1400 1401 atomic_set(&dev->xfer_avail, 1); 1402 break; 1403 case CP2112_DATA_READ_RESPONSE: 1404 hid_dbg(hdev, "read response: %02x %02x\n", data[1], data[2]); 1405 1406 dev->read_length = data[2]; 1407 if (dev->read_length > sizeof(dev->read_data)) 1408 dev->read_length = sizeof(dev->read_data); 1409 1410 memcpy(dev->read_data, &data[3], dev->read_length); 1411 atomic_set(&dev->read_avail, 1); 1412 break; 1413 default: 1414 hid_err(hdev, "unknown report\n"); 1415 1416 return 0; 1417 } 1418 1419 wake_up_interruptible(&dev->wait); 1420 return 1; 1421 } 1422 1423 static struct hid_driver cp2112_driver = { 1424 .name = "cp2112", 1425 .id_table = cp2112_devices, 1426 .probe = cp2112_probe, 1427 .remove = cp2112_remove, 1428 .raw_event = cp2112_raw_event, 1429 }; 1430 1431 module_hid_driver(cp2112_driver); 1432 MODULE_DESCRIPTION("Silicon Labs HID USB to SMBus master bridge"); 1433 MODULE_AUTHOR("David Barksdale <dbarksdale@uplogix.com>"); 1434 MODULE_LICENSE("GPL"); 1435 1436