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 * http://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/gpio.h> 20 #include <linux/gpio/driver.h> 21 #include <linux/hid.h> 22 #include <linux/hidraw.h> 23 #include <linux/i2c.h> 24 #include <linux/module.h> 25 #include <linux/nls.h> 26 #include <linux/usb/ch9.h> 27 #include "hid-ids.h" 28 29 #define CP2112_REPORT_MAX_LENGTH 64 30 #define CP2112_GPIO_CONFIG_LENGTH 5 31 #define CP2112_GPIO_GET_LENGTH 2 32 #define CP2112_GPIO_SET_LENGTH 3 33 34 enum { 35 CP2112_GPIO_CONFIG = 0x02, 36 CP2112_GPIO_GET = 0x03, 37 CP2112_GPIO_SET = 0x04, 38 CP2112_GET_VERSION_INFO = 0x05, 39 CP2112_SMBUS_CONFIG = 0x06, 40 CP2112_DATA_READ_REQUEST = 0x10, 41 CP2112_DATA_WRITE_READ_REQUEST = 0x11, 42 CP2112_DATA_READ_FORCE_SEND = 0x12, 43 CP2112_DATA_READ_RESPONSE = 0x13, 44 CP2112_DATA_WRITE_REQUEST = 0x14, 45 CP2112_TRANSFER_STATUS_REQUEST = 0x15, 46 CP2112_TRANSFER_STATUS_RESPONSE = 0x16, 47 CP2112_CANCEL_TRANSFER = 0x17, 48 CP2112_LOCK_BYTE = 0x20, 49 CP2112_USB_CONFIG = 0x21, 50 CP2112_MANUFACTURER_STRING = 0x22, 51 CP2112_PRODUCT_STRING = 0x23, 52 CP2112_SERIAL_STRING = 0x24, 53 }; 54 55 enum { 56 STATUS0_IDLE = 0x00, 57 STATUS0_BUSY = 0x01, 58 STATUS0_COMPLETE = 0x02, 59 STATUS0_ERROR = 0x03, 60 }; 61 62 enum { 63 STATUS1_TIMEOUT_NACK = 0x00, 64 STATUS1_TIMEOUT_BUS = 0x01, 65 STATUS1_ARBITRATION_LOST = 0x02, 66 STATUS1_READ_INCOMPLETE = 0x03, 67 STATUS1_WRITE_INCOMPLETE = 0x04, 68 STATUS1_SUCCESS = 0x05, 69 }; 70 71 struct cp2112_smbus_config_report { 72 u8 report; /* CP2112_SMBUS_CONFIG */ 73 __be32 clock_speed; /* Hz */ 74 u8 device_address; /* Stored in the upper 7 bits */ 75 u8 auto_send_read; /* 1 = enabled, 0 = disabled */ 76 __be16 write_timeout; /* ms, 0 = no timeout */ 77 __be16 read_timeout; /* ms, 0 = no timeout */ 78 u8 scl_low_timeout; /* 1 = enabled, 0 = disabled */ 79 __be16 retry_time; /* # of retries, 0 = no limit */ 80 } __packed; 81 82 struct cp2112_usb_config_report { 83 u8 report; /* CP2112_USB_CONFIG */ 84 __le16 vid; /* Vendor ID */ 85 __le16 pid; /* Product ID */ 86 u8 max_power; /* Power requested in 2mA units */ 87 u8 power_mode; /* 0x00 = bus powered 88 0x01 = self powered & regulator off 89 0x02 = self powered & regulator on */ 90 u8 release_major; 91 u8 release_minor; 92 u8 mask; /* What fields to program */ 93 } __packed; 94 95 struct cp2112_read_req_report { 96 u8 report; /* CP2112_DATA_READ_REQUEST */ 97 u8 slave_address; 98 __be16 length; 99 } __packed; 100 101 struct cp2112_write_read_req_report { 102 u8 report; /* CP2112_DATA_WRITE_READ_REQUEST */ 103 u8 slave_address; 104 __be16 length; 105 u8 target_address_length; 106 u8 target_address[16]; 107 } __packed; 108 109 struct cp2112_write_req_report { 110 u8 report; /* CP2112_DATA_WRITE_REQUEST */ 111 u8 slave_address; 112 u8 length; 113 u8 data[61]; 114 } __packed; 115 116 struct cp2112_force_read_report { 117 u8 report; /* CP2112_DATA_READ_FORCE_SEND */ 118 __be16 length; 119 } __packed; 120 121 struct cp2112_xfer_status_report { 122 u8 report; /* CP2112_TRANSFER_STATUS_RESPONSE */ 123 u8 status0; /* STATUS0_* */ 124 u8 status1; /* STATUS1_* */ 125 __be16 retries; 126 __be16 length; 127 } __packed; 128 129 struct cp2112_string_report { 130 u8 dummy; /* force .string to be aligned */ 131 u8 report; /* CP2112_*_STRING */ 132 u8 length; /* length in bytes of everyting after .report */ 133 u8 type; /* USB_DT_STRING */ 134 wchar_t string[30]; /* UTF16_LITTLE_ENDIAN string */ 135 } __packed; 136 137 /* Number of times to request transfer status before giving up waiting for a 138 transfer to complete. This may need to be changed if SMBUS clock, retries, 139 or read/write/scl_low timeout settings are changed. */ 140 static const int XFER_STATUS_RETRIES = 10; 141 142 /* Time in ms to wait for a CP2112_DATA_READ_RESPONSE or 143 CP2112_TRANSFER_STATUS_RESPONSE. */ 144 static const int RESPONSE_TIMEOUT = 50; 145 146 static const struct hid_device_id cp2112_devices[] = { 147 { HID_USB_DEVICE(USB_VENDOR_ID_CYGNAL, USB_DEVICE_ID_CYGNAL_CP2112) }, 148 { } 149 }; 150 MODULE_DEVICE_TABLE(hid, cp2112_devices); 151 152 struct cp2112_device { 153 struct i2c_adapter adap; 154 struct hid_device *hdev; 155 wait_queue_head_t wait; 156 u8 read_data[61]; 157 u8 read_length; 158 u8 hwversion; 159 int xfer_status; 160 atomic_t read_avail; 161 atomic_t xfer_avail; 162 struct gpio_chip gc; 163 u8 *in_out_buffer; 164 struct mutex lock; 165 166 struct gpio_desc *desc[8]; 167 bool gpio_poll; 168 struct delayed_work gpio_poll_worker; 169 unsigned long irq_mask; 170 u8 gpio_prev_state; 171 }; 172 173 static int gpio_push_pull = 0xFF; 174 module_param(gpio_push_pull, int, S_IRUGO | S_IWUSR); 175 MODULE_PARM_DESC(gpio_push_pull, "GPIO push-pull configuration bitmask"); 176 177 static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset) 178 { 179 struct cp2112_device *dev = gpiochip_get_data(chip); 180 struct hid_device *hdev = dev->hdev; 181 u8 *buf = dev->in_out_buffer; 182 int ret; 183 184 mutex_lock(&dev->lock); 185 186 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, 187 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, 188 HID_REQ_GET_REPORT); 189 if (ret != CP2112_GPIO_CONFIG_LENGTH) { 190 hid_err(hdev, "error requesting GPIO config: %d\n", ret); 191 if (ret >= 0) 192 ret = -EIO; 193 goto exit; 194 } 195 196 buf[1] &= ~(1 << offset); 197 buf[2] = gpio_push_pull; 198 199 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, 200 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, 201 HID_REQ_SET_REPORT); 202 if (ret != CP2112_GPIO_CONFIG_LENGTH) { 203 hid_err(hdev, "error setting GPIO config: %d\n", ret); 204 if (ret >= 0) 205 ret = -EIO; 206 goto exit; 207 } 208 209 ret = 0; 210 211 exit: 212 mutex_unlock(&dev->lock); 213 return ret; 214 } 215 216 static void cp2112_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 217 { 218 struct cp2112_device *dev = gpiochip_get_data(chip); 219 struct hid_device *hdev = dev->hdev; 220 u8 *buf = dev->in_out_buffer; 221 int ret; 222 223 mutex_lock(&dev->lock); 224 225 buf[0] = CP2112_GPIO_SET; 226 buf[1] = value ? 0xff : 0; 227 buf[2] = 1 << 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 mutex_unlock(&dev->lock); 236 } 237 238 static int cp2112_gpio_get_all(struct gpio_chip *chip) 239 { 240 struct cp2112_device *dev = gpiochip_get_data(chip); 241 struct hid_device *hdev = dev->hdev; 242 u8 *buf = dev->in_out_buffer; 243 int ret; 244 245 mutex_lock(&dev->lock); 246 247 ret = hid_hw_raw_request(hdev, CP2112_GPIO_GET, buf, 248 CP2112_GPIO_GET_LENGTH, HID_FEATURE_REPORT, 249 HID_REQ_GET_REPORT); 250 if (ret != CP2112_GPIO_GET_LENGTH) { 251 hid_err(hdev, "error requesting GPIO values: %d\n", ret); 252 ret = ret < 0 ? ret : -EIO; 253 goto exit; 254 } 255 256 ret = buf[1]; 257 258 exit: 259 mutex_unlock(&dev->lock); 260 261 return ret; 262 } 263 264 static int cp2112_gpio_get(struct gpio_chip *chip, unsigned int offset) 265 { 266 int ret; 267 268 ret = cp2112_gpio_get_all(chip); 269 if (ret < 0) 270 return ret; 271 272 return (ret >> offset) & 1; 273 } 274 275 static int cp2112_gpio_direction_output(struct gpio_chip *chip, 276 unsigned offset, int value) 277 { 278 struct cp2112_device *dev = gpiochip_get_data(chip); 279 struct hid_device *hdev = dev->hdev; 280 u8 *buf = dev->in_out_buffer; 281 int ret; 282 283 mutex_lock(&dev->lock); 284 285 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, 286 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, 287 HID_REQ_GET_REPORT); 288 if (ret != CP2112_GPIO_CONFIG_LENGTH) { 289 hid_err(hdev, "error requesting GPIO config: %d\n", ret); 290 goto fail; 291 } 292 293 buf[1] |= 1 << offset; 294 buf[2] = gpio_push_pull; 295 296 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, 297 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, 298 HID_REQ_SET_REPORT); 299 if (ret < 0) { 300 hid_err(hdev, "error setting GPIO config: %d\n", ret); 301 goto fail; 302 } 303 304 mutex_unlock(&dev->lock); 305 306 /* 307 * Set gpio value when output direction is already set, 308 * as specified in AN495, Rev. 0.2, cpt. 4.4 309 */ 310 cp2112_gpio_set(chip, offset, value); 311 312 return 0; 313 314 fail: 315 mutex_unlock(&dev->lock); 316 return ret < 0 ? ret : -EIO; 317 } 318 319 static int cp2112_hid_get(struct hid_device *hdev, unsigned char report_number, 320 u8 *data, size_t count, unsigned char report_type) 321 { 322 u8 *buf; 323 int ret; 324 325 buf = kmalloc(count, GFP_KERNEL); 326 if (!buf) 327 return -ENOMEM; 328 329 ret = hid_hw_raw_request(hdev, report_number, buf, count, 330 report_type, HID_REQ_GET_REPORT); 331 memcpy(data, buf, count); 332 kfree(buf); 333 return ret; 334 } 335 336 static int cp2112_hid_output(struct hid_device *hdev, u8 *data, size_t count, 337 unsigned char report_type) 338 { 339 u8 *buf; 340 int ret; 341 342 buf = kmemdup(data, count, GFP_KERNEL); 343 if (!buf) 344 return -ENOMEM; 345 346 if (report_type == HID_OUTPUT_REPORT) 347 ret = hid_hw_output_report(hdev, buf, count); 348 else 349 ret = hid_hw_raw_request(hdev, buf[0], buf, count, report_type, 350 HID_REQ_SET_REPORT); 351 352 kfree(buf); 353 return ret; 354 } 355 356 static int cp2112_wait(struct cp2112_device *dev, atomic_t *avail) 357 { 358 int ret = 0; 359 360 /* We have sent either a CP2112_TRANSFER_STATUS_REQUEST or a 361 * CP2112_DATA_READ_FORCE_SEND and we are waiting for the response to 362 * come in cp2112_raw_event or timeout. There will only be one of these 363 * in flight at any one time. The timeout is extremely large and is a 364 * last resort if the CP2112 has died. If we do timeout we don't expect 365 * to receive the response which would cause data races, it's not like 366 * we can do anything about it anyway. 367 */ 368 ret = wait_event_interruptible_timeout(dev->wait, 369 atomic_read(avail), msecs_to_jiffies(RESPONSE_TIMEOUT)); 370 if (-ERESTARTSYS == ret) 371 return ret; 372 if (!ret) 373 return -ETIMEDOUT; 374 375 atomic_set(avail, 0); 376 return 0; 377 } 378 379 static int cp2112_xfer_status(struct cp2112_device *dev) 380 { 381 struct hid_device *hdev = dev->hdev; 382 u8 buf[2]; 383 int ret; 384 385 buf[0] = CP2112_TRANSFER_STATUS_REQUEST; 386 buf[1] = 0x01; 387 atomic_set(&dev->xfer_avail, 0); 388 389 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); 390 if (ret < 0) { 391 hid_warn(hdev, "Error requesting status: %d\n", ret); 392 return ret; 393 } 394 395 ret = cp2112_wait(dev, &dev->xfer_avail); 396 if (ret) 397 return ret; 398 399 return dev->xfer_status; 400 } 401 402 static int cp2112_read(struct cp2112_device *dev, u8 *data, size_t size) 403 { 404 struct hid_device *hdev = dev->hdev; 405 struct cp2112_force_read_report report; 406 int ret; 407 408 if (size > sizeof(dev->read_data)) 409 size = sizeof(dev->read_data); 410 report.report = CP2112_DATA_READ_FORCE_SEND; 411 report.length = cpu_to_be16(size); 412 413 atomic_set(&dev->read_avail, 0); 414 415 ret = cp2112_hid_output(hdev, &report.report, sizeof(report), 416 HID_OUTPUT_REPORT); 417 if (ret < 0) { 418 hid_warn(hdev, "Error requesting data: %d\n", ret); 419 return ret; 420 } 421 422 ret = cp2112_wait(dev, &dev->read_avail); 423 if (ret) 424 return ret; 425 426 hid_dbg(hdev, "read %d of %zd bytes requested\n", 427 dev->read_length, size); 428 429 if (size > dev->read_length) 430 size = dev->read_length; 431 432 memcpy(data, dev->read_data, size); 433 return dev->read_length; 434 } 435 436 static int cp2112_read_req(void *buf, u8 slave_address, u16 length) 437 { 438 struct cp2112_read_req_report *report = buf; 439 440 if (length < 1 || length > 512) 441 return -EINVAL; 442 443 report->report = CP2112_DATA_READ_REQUEST; 444 report->slave_address = slave_address << 1; 445 report->length = cpu_to_be16(length); 446 return sizeof(*report); 447 } 448 449 static int cp2112_write_read_req(void *buf, u8 slave_address, u16 length, 450 u8 command, u8 *data, u8 data_length) 451 { 452 struct cp2112_write_read_req_report *report = buf; 453 454 if (length < 1 || length > 512 455 || data_length > sizeof(report->target_address) - 1) 456 return -EINVAL; 457 458 report->report = CP2112_DATA_WRITE_READ_REQUEST; 459 report->slave_address = slave_address << 1; 460 report->length = cpu_to_be16(length); 461 report->target_address_length = data_length + 1; 462 report->target_address[0] = command; 463 memcpy(&report->target_address[1], data, data_length); 464 return data_length + 6; 465 } 466 467 static int cp2112_write_req(void *buf, u8 slave_address, u8 command, u8 *data, 468 u8 data_length) 469 { 470 struct cp2112_write_req_report *report = buf; 471 472 if (data_length > sizeof(report->data) - 1) 473 return -EINVAL; 474 475 report->report = CP2112_DATA_WRITE_REQUEST; 476 report->slave_address = slave_address << 1; 477 report->length = data_length + 1; 478 report->data[0] = command; 479 memcpy(&report->data[1], data, data_length); 480 return data_length + 4; 481 } 482 483 static int cp2112_i2c_write_req(void *buf, u8 slave_address, u8 *data, 484 u8 data_length) 485 { 486 struct cp2112_write_req_report *report = buf; 487 488 if (data_length > sizeof(report->data)) 489 return -EINVAL; 490 491 report->report = CP2112_DATA_WRITE_REQUEST; 492 report->slave_address = slave_address << 1; 493 report->length = data_length; 494 memcpy(report->data, data, data_length); 495 return data_length + 3; 496 } 497 498 static int cp2112_i2c_write_read_req(void *buf, u8 slave_address, 499 u8 *addr, int addr_length, 500 int read_length) 501 { 502 struct cp2112_write_read_req_report *report = buf; 503 504 if (read_length < 1 || read_length > 512 || 505 addr_length > sizeof(report->target_address)) 506 return -EINVAL; 507 508 report->report = CP2112_DATA_WRITE_READ_REQUEST; 509 report->slave_address = slave_address << 1; 510 report->length = cpu_to_be16(read_length); 511 report->target_address_length = addr_length; 512 memcpy(report->target_address, addr, addr_length); 513 return addr_length + 5; 514 } 515 516 static int cp2112_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, 517 int num) 518 { 519 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; 520 struct hid_device *hdev = dev->hdev; 521 u8 buf[64]; 522 ssize_t count; 523 ssize_t read_length = 0; 524 u8 *read_buf = NULL; 525 unsigned int retries; 526 int ret; 527 528 hid_dbg(hdev, "I2C %d messages\n", num); 529 530 if (num == 1) { 531 if (msgs->flags & I2C_M_RD) { 532 hid_dbg(hdev, "I2C read %#04x len %d\n", 533 msgs->addr, msgs->len); 534 read_length = msgs->len; 535 read_buf = msgs->buf; 536 count = cp2112_read_req(buf, msgs->addr, msgs->len); 537 } else { 538 hid_dbg(hdev, "I2C write %#04x len %d\n", 539 msgs->addr, msgs->len); 540 count = cp2112_i2c_write_req(buf, msgs->addr, 541 msgs->buf, msgs->len); 542 } 543 if (count < 0) 544 return count; 545 } else if (dev->hwversion > 1 && /* no repeated start in rev 1 */ 546 num == 2 && 547 msgs[0].addr == msgs[1].addr && 548 !(msgs[0].flags & I2C_M_RD) && (msgs[1].flags & I2C_M_RD)) { 549 hid_dbg(hdev, "I2C write-read %#04x wlen %d rlen %d\n", 550 msgs[0].addr, msgs[0].len, msgs[1].len); 551 read_length = msgs[1].len; 552 read_buf = msgs[1].buf; 553 count = cp2112_i2c_write_read_req(buf, msgs[0].addr, 554 msgs[0].buf, msgs[0].len, msgs[1].len); 555 if (count < 0) 556 return count; 557 } else { 558 hid_err(hdev, 559 "Multi-message I2C transactions not supported\n"); 560 return -EOPNOTSUPP; 561 } 562 563 ret = hid_hw_power(hdev, PM_HINT_FULLON); 564 if (ret < 0) { 565 hid_err(hdev, "power management error: %d\n", ret); 566 return ret; 567 } 568 569 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); 570 if (ret < 0) { 571 hid_warn(hdev, "Error starting transaction: %d\n", ret); 572 goto power_normal; 573 } 574 575 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { 576 ret = cp2112_xfer_status(dev); 577 if (-EBUSY == ret) 578 continue; 579 if (ret < 0) 580 goto power_normal; 581 break; 582 } 583 584 if (XFER_STATUS_RETRIES <= retries) { 585 hid_warn(hdev, "Transfer timed out, cancelling.\n"); 586 buf[0] = CP2112_CANCEL_TRANSFER; 587 buf[1] = 0x01; 588 589 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); 590 if (ret < 0) 591 hid_warn(hdev, "Error cancelling transaction: %d\n", 592 ret); 593 594 ret = -ETIMEDOUT; 595 goto power_normal; 596 } 597 598 for (count = 0; count < read_length;) { 599 ret = cp2112_read(dev, read_buf + count, read_length - count); 600 if (ret < 0) 601 goto power_normal; 602 if (ret == 0) { 603 hid_err(hdev, "read returned 0\n"); 604 ret = -EIO; 605 goto power_normal; 606 } 607 count += ret; 608 if (count > read_length) { 609 /* 610 * The hardware returned too much data. 611 * This is mostly harmless because cp2112_read() 612 * has a limit check so didn't overrun our 613 * buffer. Nevertheless, we return an error 614 * because something is seriously wrong and 615 * it shouldn't go unnoticed. 616 */ 617 hid_err(hdev, "long read: %d > %zd\n", 618 ret, read_length - count + ret); 619 ret = -EIO; 620 goto power_normal; 621 } 622 } 623 624 /* return the number of transferred messages */ 625 ret = num; 626 627 power_normal: 628 hid_hw_power(hdev, PM_HINT_NORMAL); 629 hid_dbg(hdev, "I2C transfer finished: %d\n", ret); 630 return ret; 631 } 632 633 static int cp2112_xfer(struct i2c_adapter *adap, u16 addr, 634 unsigned short flags, char read_write, u8 command, 635 int size, union i2c_smbus_data *data) 636 { 637 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; 638 struct hid_device *hdev = dev->hdev; 639 u8 buf[64]; 640 __le16 word; 641 ssize_t count; 642 size_t read_length = 0; 643 unsigned int retries; 644 int ret; 645 646 hid_dbg(hdev, "%s addr 0x%x flags 0x%x cmd 0x%x size %d\n", 647 read_write == I2C_SMBUS_WRITE ? "write" : "read", 648 addr, flags, command, size); 649 650 switch (size) { 651 case I2C_SMBUS_BYTE: 652 read_length = 1; 653 654 if (I2C_SMBUS_READ == read_write) 655 count = cp2112_read_req(buf, addr, read_length); 656 else 657 count = cp2112_write_req(buf, addr, command, NULL, 658 0); 659 break; 660 case I2C_SMBUS_BYTE_DATA: 661 read_length = 1; 662 663 if (I2C_SMBUS_READ == read_write) 664 count = cp2112_write_read_req(buf, addr, read_length, 665 command, NULL, 0); 666 else 667 count = cp2112_write_req(buf, addr, command, 668 &data->byte, 1); 669 break; 670 case I2C_SMBUS_WORD_DATA: 671 read_length = 2; 672 word = cpu_to_le16(data->word); 673 674 if (I2C_SMBUS_READ == read_write) 675 count = cp2112_write_read_req(buf, addr, read_length, 676 command, NULL, 0); 677 else 678 count = cp2112_write_req(buf, addr, command, 679 (u8 *)&word, 2); 680 break; 681 case I2C_SMBUS_PROC_CALL: 682 size = I2C_SMBUS_WORD_DATA; 683 read_write = I2C_SMBUS_READ; 684 read_length = 2; 685 word = cpu_to_le16(data->word); 686 687 count = cp2112_write_read_req(buf, addr, read_length, command, 688 (u8 *)&word, 2); 689 break; 690 case I2C_SMBUS_I2C_BLOCK_DATA: 691 if (read_write == I2C_SMBUS_READ) { 692 read_length = data->block[0]; 693 count = cp2112_write_read_req(buf, addr, read_length, 694 command, NULL, 0); 695 } else { 696 count = cp2112_write_req(buf, addr, command, 697 data->block + 1, 698 data->block[0]); 699 } 700 break; 701 case I2C_SMBUS_BLOCK_DATA: 702 if (I2C_SMBUS_READ == read_write) { 703 count = cp2112_write_read_req(buf, addr, 704 I2C_SMBUS_BLOCK_MAX, 705 command, NULL, 0); 706 } else { 707 count = cp2112_write_req(buf, addr, command, 708 data->block, 709 data->block[0] + 1); 710 } 711 break; 712 case I2C_SMBUS_BLOCK_PROC_CALL: 713 size = I2C_SMBUS_BLOCK_DATA; 714 read_write = I2C_SMBUS_READ; 715 716 count = cp2112_write_read_req(buf, addr, I2C_SMBUS_BLOCK_MAX, 717 command, data->block, 718 data->block[0] + 1); 719 break; 720 default: 721 hid_warn(hdev, "Unsupported transaction %d\n", size); 722 return -EOPNOTSUPP; 723 } 724 725 if (count < 0) 726 return count; 727 728 ret = hid_hw_power(hdev, PM_HINT_FULLON); 729 if (ret < 0) { 730 hid_err(hdev, "power management error: %d\n", ret); 731 return ret; 732 } 733 734 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); 735 if (ret < 0) { 736 hid_warn(hdev, "Error starting transaction: %d\n", ret); 737 goto power_normal; 738 } 739 740 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { 741 ret = cp2112_xfer_status(dev); 742 if (-EBUSY == ret) 743 continue; 744 if (ret < 0) 745 goto power_normal; 746 break; 747 } 748 749 if (XFER_STATUS_RETRIES <= retries) { 750 hid_warn(hdev, "Transfer timed out, cancelling.\n"); 751 buf[0] = CP2112_CANCEL_TRANSFER; 752 buf[1] = 0x01; 753 754 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); 755 if (ret < 0) 756 hid_warn(hdev, "Error cancelling transaction: %d\n", 757 ret); 758 759 ret = -ETIMEDOUT; 760 goto power_normal; 761 } 762 763 if (I2C_SMBUS_WRITE == read_write) { 764 ret = 0; 765 goto power_normal; 766 } 767 768 if (I2C_SMBUS_BLOCK_DATA == size) 769 read_length = ret; 770 771 ret = cp2112_read(dev, buf, read_length); 772 if (ret < 0) 773 goto power_normal; 774 if (ret != read_length) { 775 hid_warn(hdev, "short read: %d < %zd\n", ret, read_length); 776 ret = -EIO; 777 goto power_normal; 778 } 779 780 switch (size) { 781 case I2C_SMBUS_BYTE: 782 case I2C_SMBUS_BYTE_DATA: 783 data->byte = buf[0]; 784 break; 785 case I2C_SMBUS_WORD_DATA: 786 data->word = le16_to_cpup((__le16 *)buf); 787 break; 788 case I2C_SMBUS_I2C_BLOCK_DATA: 789 memcpy(data->block + 1, buf, read_length); 790 break; 791 case I2C_SMBUS_BLOCK_DATA: 792 if (read_length > I2C_SMBUS_BLOCK_MAX) { 793 ret = -EPROTO; 794 goto power_normal; 795 } 796 797 memcpy(data->block, buf, read_length); 798 break; 799 } 800 801 ret = 0; 802 power_normal: 803 hid_hw_power(hdev, PM_HINT_NORMAL); 804 hid_dbg(hdev, "transfer finished: %d\n", ret); 805 return ret; 806 } 807 808 static u32 cp2112_functionality(struct i2c_adapter *adap) 809 { 810 return I2C_FUNC_I2C | 811 I2C_FUNC_SMBUS_BYTE | 812 I2C_FUNC_SMBUS_BYTE_DATA | 813 I2C_FUNC_SMBUS_WORD_DATA | 814 I2C_FUNC_SMBUS_BLOCK_DATA | 815 I2C_FUNC_SMBUS_I2C_BLOCK | 816 I2C_FUNC_SMBUS_PROC_CALL | 817 I2C_FUNC_SMBUS_BLOCK_PROC_CALL; 818 } 819 820 static const struct i2c_algorithm smbus_algorithm = { 821 .master_xfer = cp2112_i2c_xfer, 822 .smbus_xfer = cp2112_xfer, 823 .functionality = cp2112_functionality, 824 }; 825 826 static int cp2112_get_usb_config(struct hid_device *hdev, 827 struct cp2112_usb_config_report *cfg) 828 { 829 int ret; 830 831 ret = cp2112_hid_get(hdev, CP2112_USB_CONFIG, (u8 *)cfg, sizeof(*cfg), 832 HID_FEATURE_REPORT); 833 if (ret != sizeof(*cfg)) { 834 hid_err(hdev, "error reading usb config: %d\n", ret); 835 if (ret < 0) 836 return ret; 837 return -EIO; 838 } 839 840 return 0; 841 } 842 843 static int cp2112_set_usb_config(struct hid_device *hdev, 844 struct cp2112_usb_config_report *cfg) 845 { 846 int ret; 847 848 BUG_ON(cfg->report != CP2112_USB_CONFIG); 849 850 ret = cp2112_hid_output(hdev, (u8 *)cfg, sizeof(*cfg), 851 HID_FEATURE_REPORT); 852 if (ret != sizeof(*cfg)) { 853 hid_err(hdev, "error writing usb config: %d\n", ret); 854 if (ret < 0) 855 return ret; 856 return -EIO; 857 } 858 859 return 0; 860 } 861 862 static void chmod_sysfs_attrs(struct hid_device *hdev); 863 864 #define CP2112_CONFIG_ATTR(name, store, format, ...) \ 865 static ssize_t name##_store(struct device *kdev, \ 866 struct device_attribute *attr, const char *buf, \ 867 size_t count) \ 868 { \ 869 struct hid_device *hdev = to_hid_device(kdev); \ 870 struct cp2112_usb_config_report cfg; \ 871 int ret = cp2112_get_usb_config(hdev, &cfg); \ 872 if (ret) \ 873 return ret; \ 874 store; \ 875 ret = cp2112_set_usb_config(hdev, &cfg); \ 876 if (ret) \ 877 return ret; \ 878 chmod_sysfs_attrs(hdev); \ 879 return count; \ 880 } \ 881 static ssize_t name##_show(struct device *kdev, \ 882 struct device_attribute *attr, char *buf) \ 883 { \ 884 struct hid_device *hdev = to_hid_device(kdev); \ 885 struct cp2112_usb_config_report cfg; \ 886 int ret = cp2112_get_usb_config(hdev, &cfg); \ 887 if (ret) \ 888 return ret; \ 889 return scnprintf(buf, PAGE_SIZE, format, ##__VA_ARGS__); \ 890 } \ 891 static DEVICE_ATTR_RW(name); 892 893 CP2112_CONFIG_ATTR(vendor_id, ({ 894 u16 vid; 895 896 if (sscanf(buf, "%hi", &vid) != 1) 897 return -EINVAL; 898 899 cfg.vid = cpu_to_le16(vid); 900 cfg.mask = 0x01; 901 }), "0x%04x\n", le16_to_cpu(cfg.vid)); 902 903 CP2112_CONFIG_ATTR(product_id, ({ 904 u16 pid; 905 906 if (sscanf(buf, "%hi", &pid) != 1) 907 return -EINVAL; 908 909 cfg.pid = cpu_to_le16(pid); 910 cfg.mask = 0x02; 911 }), "0x%04x\n", le16_to_cpu(cfg.pid)); 912 913 CP2112_CONFIG_ATTR(max_power, ({ 914 int mA; 915 916 if (sscanf(buf, "%i", &mA) != 1) 917 return -EINVAL; 918 919 cfg.max_power = (mA + 1) / 2; 920 cfg.mask = 0x04; 921 }), "%u mA\n", cfg.max_power * 2); 922 923 CP2112_CONFIG_ATTR(power_mode, ({ 924 if (sscanf(buf, "%hhi", &cfg.power_mode) != 1) 925 return -EINVAL; 926 927 cfg.mask = 0x08; 928 }), "%u\n", cfg.power_mode); 929 930 CP2112_CONFIG_ATTR(release_version, ({ 931 if (sscanf(buf, "%hhi.%hhi", &cfg.release_major, &cfg.release_minor) 932 != 2) 933 return -EINVAL; 934 935 cfg.mask = 0x10; 936 }), "%u.%u\n", cfg.release_major, cfg.release_minor); 937 938 #undef CP2112_CONFIG_ATTR 939 940 struct cp2112_pstring_attribute { 941 struct device_attribute attr; 942 unsigned char report; 943 }; 944 945 static ssize_t pstr_store(struct device *kdev, 946 struct device_attribute *kattr, const char *buf, 947 size_t count) 948 { 949 struct hid_device *hdev = to_hid_device(kdev); 950 struct cp2112_pstring_attribute *attr = 951 container_of(kattr, struct cp2112_pstring_attribute, attr); 952 struct cp2112_string_report report; 953 int ret; 954 955 memset(&report, 0, sizeof(report)); 956 957 ret = utf8s_to_utf16s(buf, count, UTF16_LITTLE_ENDIAN, 958 report.string, ARRAY_SIZE(report.string)); 959 report.report = attr->report; 960 report.length = ret * sizeof(report.string[0]) + 2; 961 report.type = USB_DT_STRING; 962 963 ret = cp2112_hid_output(hdev, &report.report, report.length + 1, 964 HID_FEATURE_REPORT); 965 if (ret != report.length + 1) { 966 hid_err(hdev, "error writing %s string: %d\n", kattr->attr.name, 967 ret); 968 if (ret < 0) 969 return ret; 970 return -EIO; 971 } 972 973 chmod_sysfs_attrs(hdev); 974 return count; 975 } 976 977 static ssize_t pstr_show(struct device *kdev, 978 struct device_attribute *kattr, char *buf) 979 { 980 struct hid_device *hdev = to_hid_device(kdev); 981 struct cp2112_pstring_attribute *attr = 982 container_of(kattr, struct cp2112_pstring_attribute, attr); 983 struct cp2112_string_report report; 984 u8 length; 985 int ret; 986 987 ret = cp2112_hid_get(hdev, attr->report, &report.report, 988 sizeof(report) - 1, HID_FEATURE_REPORT); 989 if (ret < 3) { 990 hid_err(hdev, "error reading %s string: %d\n", kattr->attr.name, 991 ret); 992 if (ret < 0) 993 return ret; 994 return -EIO; 995 } 996 997 if (report.length < 2) { 998 hid_err(hdev, "invalid %s string length: %d\n", 999 kattr->attr.name, report.length); 1000 return -EIO; 1001 } 1002 1003 length = report.length > ret - 1 ? ret - 1 : report.length; 1004 length = (length - 2) / sizeof(report.string[0]); 1005 ret = utf16s_to_utf8s(report.string, length, UTF16_LITTLE_ENDIAN, buf, 1006 PAGE_SIZE - 1); 1007 buf[ret++] = '\n'; 1008 return ret; 1009 } 1010 1011 #define CP2112_PSTR_ATTR(name, _report) \ 1012 static struct cp2112_pstring_attribute dev_attr_##name = { \ 1013 .attr = __ATTR(name, (S_IWUSR | S_IRUGO), pstr_show, pstr_store), \ 1014 .report = _report, \ 1015 }; 1016 1017 CP2112_PSTR_ATTR(manufacturer, CP2112_MANUFACTURER_STRING); 1018 CP2112_PSTR_ATTR(product, CP2112_PRODUCT_STRING); 1019 CP2112_PSTR_ATTR(serial, CP2112_SERIAL_STRING); 1020 1021 #undef CP2112_PSTR_ATTR 1022 1023 static const struct attribute_group cp2112_attr_group = { 1024 .attrs = (struct attribute *[]){ 1025 &dev_attr_vendor_id.attr, 1026 &dev_attr_product_id.attr, 1027 &dev_attr_max_power.attr, 1028 &dev_attr_power_mode.attr, 1029 &dev_attr_release_version.attr, 1030 &dev_attr_manufacturer.attr.attr, 1031 &dev_attr_product.attr.attr, 1032 &dev_attr_serial.attr.attr, 1033 NULL 1034 } 1035 }; 1036 1037 /* Chmoding our sysfs attributes is simply a way to expose which fields in the 1038 * PROM have already been programmed. We do not depend on this preventing 1039 * writing to these attributes since the CP2112 will simply ignore writes to 1040 * already-programmed fields. This is why there is no sense in fixing this 1041 * racy behaviour. 1042 */ 1043 static void chmod_sysfs_attrs(struct hid_device *hdev) 1044 { 1045 struct attribute **attr; 1046 u8 buf[2]; 1047 int ret; 1048 1049 ret = cp2112_hid_get(hdev, CP2112_LOCK_BYTE, buf, sizeof(buf), 1050 HID_FEATURE_REPORT); 1051 if (ret != sizeof(buf)) { 1052 hid_err(hdev, "error reading lock byte: %d\n", ret); 1053 return; 1054 } 1055 1056 for (attr = cp2112_attr_group.attrs; *attr; ++attr) { 1057 umode_t mode = (buf[1] & 1) ? S_IWUSR | S_IRUGO : S_IRUGO; 1058 ret = sysfs_chmod_file(&hdev->dev.kobj, *attr, mode); 1059 if (ret < 0) 1060 hid_err(hdev, "error chmoding sysfs file %s\n", 1061 (*attr)->name); 1062 buf[1] >>= 1; 1063 } 1064 } 1065 1066 static void cp2112_gpio_irq_ack(struct irq_data *d) 1067 { 1068 } 1069 1070 static void cp2112_gpio_irq_mask(struct irq_data *d) 1071 { 1072 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1073 struct cp2112_device *dev = gpiochip_get_data(gc); 1074 1075 __clear_bit(d->hwirq, &dev->irq_mask); 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 1083 __set_bit(d->hwirq, &dev->irq_mask); 1084 } 1085 1086 static void cp2112_gpio_poll_callback(struct work_struct *work) 1087 { 1088 struct cp2112_device *dev = container_of(work, struct cp2112_device, 1089 gpio_poll_worker.work); 1090 struct irq_data *d; 1091 u8 gpio_mask; 1092 u8 virqs = (u8)dev->irq_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 1104 while (virqs) { 1105 virq = ffs(virqs) - 1; 1106 virqs &= ~BIT(virq); 1107 1108 if (!dev->gc.to_irq) 1109 break; 1110 1111 irq = dev->gc.to_irq(&dev->gc, virq); 1112 1113 d = irq_get_irq_data(irq); 1114 if (!d) 1115 continue; 1116 1117 irq_type = irqd_get_trigger_type(d); 1118 1119 if (gpio_mask & BIT(virq)) { 1120 /* Level High */ 1121 1122 if (irq_type & IRQ_TYPE_LEVEL_HIGH) 1123 handle_nested_irq(irq); 1124 1125 if ((irq_type & IRQ_TYPE_EDGE_RISING) && 1126 !(dev->gpio_prev_state & BIT(virq))) 1127 handle_nested_irq(irq); 1128 } else { 1129 /* Level Low */ 1130 1131 if (irq_type & IRQ_TYPE_LEVEL_LOW) 1132 handle_nested_irq(irq); 1133 1134 if ((irq_type & IRQ_TYPE_EDGE_FALLING) && 1135 (dev->gpio_prev_state & BIT(virq))) 1136 handle_nested_irq(irq); 1137 } 1138 } 1139 1140 dev->gpio_prev_state = gpio_mask; 1141 1142 exit: 1143 if (dev->gpio_poll) 1144 schedule_delayed_work(&dev->gpio_poll_worker, 10); 1145 } 1146 1147 1148 static unsigned int cp2112_gpio_irq_startup(struct irq_data *d) 1149 { 1150 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1151 struct cp2112_device *dev = gpiochip_get_data(gc); 1152 1153 INIT_DELAYED_WORK(&dev->gpio_poll_worker, cp2112_gpio_poll_callback); 1154 1155 cp2112_gpio_direction_input(gc, d->hwirq); 1156 1157 if (!dev->gpio_poll) { 1158 dev->gpio_poll = true; 1159 schedule_delayed_work(&dev->gpio_poll_worker, 0); 1160 } 1161 1162 cp2112_gpio_irq_unmask(d); 1163 return 0; 1164 } 1165 1166 static void cp2112_gpio_irq_shutdown(struct irq_data *d) 1167 { 1168 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1169 struct cp2112_device *dev = gpiochip_get_data(gc); 1170 1171 cancel_delayed_work_sync(&dev->gpio_poll_worker); 1172 } 1173 1174 static int cp2112_gpio_irq_type(struct irq_data *d, unsigned int type) 1175 { 1176 return 0; 1177 } 1178 1179 static struct irq_chip cp2112_gpio_irqchip = { 1180 .name = "cp2112-gpio", 1181 .irq_startup = cp2112_gpio_irq_startup, 1182 .irq_shutdown = cp2112_gpio_irq_shutdown, 1183 .irq_ack = cp2112_gpio_irq_ack, 1184 .irq_mask = cp2112_gpio_irq_mask, 1185 .irq_unmask = cp2112_gpio_irq_unmask, 1186 .irq_set_type = cp2112_gpio_irq_type, 1187 }; 1188 1189 static int __maybe_unused cp2112_allocate_irq(struct cp2112_device *dev, 1190 int pin) 1191 { 1192 int ret; 1193 1194 if (dev->desc[pin]) 1195 return -EINVAL; 1196 1197 dev->desc[pin] = gpiochip_request_own_desc(&dev->gc, pin, 1198 "HID/I2C:Event", 0); 1199 if (IS_ERR(dev->desc[pin])) { 1200 dev_err(dev->gc.parent, "Failed to request GPIO\n"); 1201 return PTR_ERR(dev->desc[pin]); 1202 } 1203 1204 ret = gpiochip_lock_as_irq(&dev->gc, pin); 1205 if (ret) { 1206 dev_err(dev->gc.parent, "Failed to lock GPIO as interrupt\n"); 1207 goto err_desc; 1208 } 1209 1210 ret = gpiod_to_irq(dev->desc[pin]); 1211 if (ret < 0) { 1212 dev_err(dev->gc.parent, "Failed to translate GPIO to IRQ\n"); 1213 goto err_lock; 1214 } 1215 1216 return ret; 1217 1218 err_lock: 1219 gpiochip_unlock_as_irq(&dev->gc, pin); 1220 err_desc: 1221 gpiochip_free_own_desc(dev->desc[pin]); 1222 dev->desc[pin] = NULL; 1223 return ret; 1224 } 1225 1226 static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id) 1227 { 1228 struct cp2112_device *dev; 1229 u8 buf[3]; 1230 struct cp2112_smbus_config_report config; 1231 int ret; 1232 1233 dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL); 1234 if (!dev) 1235 return -ENOMEM; 1236 1237 dev->in_out_buffer = devm_kzalloc(&hdev->dev, CP2112_REPORT_MAX_LENGTH, 1238 GFP_KERNEL); 1239 if (!dev->in_out_buffer) 1240 return -ENOMEM; 1241 1242 mutex_init(&dev->lock); 1243 1244 ret = hid_parse(hdev); 1245 if (ret) { 1246 hid_err(hdev, "parse failed\n"); 1247 return ret; 1248 } 1249 1250 ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW); 1251 if (ret) { 1252 hid_err(hdev, "hw start failed\n"); 1253 return ret; 1254 } 1255 1256 ret = hid_hw_open(hdev); 1257 if (ret) { 1258 hid_err(hdev, "hw open failed\n"); 1259 goto err_hid_stop; 1260 } 1261 1262 ret = hid_hw_power(hdev, PM_HINT_FULLON); 1263 if (ret < 0) { 1264 hid_err(hdev, "power management error: %d\n", ret); 1265 goto err_hid_close; 1266 } 1267 1268 ret = cp2112_hid_get(hdev, CP2112_GET_VERSION_INFO, buf, sizeof(buf), 1269 HID_FEATURE_REPORT); 1270 if (ret != sizeof(buf)) { 1271 hid_err(hdev, "error requesting version\n"); 1272 if (ret >= 0) 1273 ret = -EIO; 1274 goto err_power_normal; 1275 } 1276 1277 hid_info(hdev, "Part Number: 0x%02X Device Version: 0x%02X\n", 1278 buf[1], buf[2]); 1279 1280 ret = cp2112_hid_get(hdev, CP2112_SMBUS_CONFIG, (u8 *)&config, 1281 sizeof(config), HID_FEATURE_REPORT); 1282 if (ret != sizeof(config)) { 1283 hid_err(hdev, "error requesting SMBus config\n"); 1284 if (ret >= 0) 1285 ret = -EIO; 1286 goto err_power_normal; 1287 } 1288 1289 config.retry_time = cpu_to_be16(1); 1290 1291 ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config), 1292 HID_FEATURE_REPORT); 1293 if (ret != sizeof(config)) { 1294 hid_err(hdev, "error setting SMBus config\n"); 1295 if (ret >= 0) 1296 ret = -EIO; 1297 goto err_power_normal; 1298 } 1299 1300 hid_set_drvdata(hdev, (void *)dev); 1301 dev->hdev = hdev; 1302 dev->adap.owner = THIS_MODULE; 1303 dev->adap.class = I2C_CLASS_HWMON; 1304 dev->adap.algo = &smbus_algorithm; 1305 dev->adap.algo_data = dev; 1306 dev->adap.dev.parent = &hdev->dev; 1307 snprintf(dev->adap.name, sizeof(dev->adap.name), 1308 "CP2112 SMBus Bridge on hidraw%d", 1309 ((struct hidraw *)hdev->hidraw)->minor); 1310 dev->hwversion = buf[2]; 1311 init_waitqueue_head(&dev->wait); 1312 1313 hid_device_io_start(hdev); 1314 ret = i2c_add_adapter(&dev->adap); 1315 hid_device_io_stop(hdev); 1316 1317 if (ret) { 1318 hid_err(hdev, "error registering i2c adapter\n"); 1319 goto err_power_normal; 1320 } 1321 1322 hid_dbg(hdev, "adapter registered\n"); 1323 1324 dev->gc.label = "cp2112_gpio"; 1325 dev->gc.direction_input = cp2112_gpio_direction_input; 1326 dev->gc.direction_output = cp2112_gpio_direction_output; 1327 dev->gc.set = cp2112_gpio_set; 1328 dev->gc.get = cp2112_gpio_get; 1329 dev->gc.base = -1; 1330 dev->gc.ngpio = 8; 1331 dev->gc.can_sleep = 1; 1332 dev->gc.parent = &hdev->dev; 1333 1334 ret = gpiochip_add_data(&dev->gc, dev); 1335 if (ret < 0) { 1336 hid_err(hdev, "error registering gpio chip\n"); 1337 goto err_free_i2c; 1338 } 1339 1340 ret = sysfs_create_group(&hdev->dev.kobj, &cp2112_attr_group); 1341 if (ret < 0) { 1342 hid_err(hdev, "error creating sysfs attrs\n"); 1343 goto err_gpiochip_remove; 1344 } 1345 1346 chmod_sysfs_attrs(hdev); 1347 hid_hw_power(hdev, PM_HINT_NORMAL); 1348 1349 ret = gpiochip_irqchip_add(&dev->gc, &cp2112_gpio_irqchip, 0, 1350 handle_simple_irq, IRQ_TYPE_NONE); 1351 if (ret) { 1352 dev_err(dev->gc.parent, "failed to add IRQ chip\n"); 1353 goto err_sysfs_remove; 1354 } 1355 1356 return ret; 1357 1358 err_sysfs_remove: 1359 sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group); 1360 err_gpiochip_remove: 1361 gpiochip_remove(&dev->gc); 1362 err_free_i2c: 1363 i2c_del_adapter(&dev->adap); 1364 err_power_normal: 1365 hid_hw_power(hdev, PM_HINT_NORMAL); 1366 err_hid_close: 1367 hid_hw_close(hdev); 1368 err_hid_stop: 1369 hid_hw_stop(hdev); 1370 return ret; 1371 } 1372 1373 static void cp2112_remove(struct hid_device *hdev) 1374 { 1375 struct cp2112_device *dev = hid_get_drvdata(hdev); 1376 int i; 1377 1378 sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group); 1379 i2c_del_adapter(&dev->adap); 1380 1381 if (dev->gpio_poll) { 1382 dev->gpio_poll = false; 1383 cancel_delayed_work_sync(&dev->gpio_poll_worker); 1384 } 1385 1386 for (i = 0; i < ARRAY_SIZE(dev->desc); i++) { 1387 gpiochip_unlock_as_irq(&dev->gc, i); 1388 gpiochip_free_own_desc(dev->desc[i]); 1389 } 1390 1391 gpiochip_remove(&dev->gc); 1392 /* i2c_del_adapter has finished removing all i2c devices from our 1393 * adapter. Well behaved devices should no longer call our cp2112_xfer 1394 * and should have waited for any pending calls to finish. It has also 1395 * waited for device_unregister(&adap->dev) to complete. Therefore we 1396 * can safely free our struct cp2112_device. 1397 */ 1398 hid_hw_close(hdev); 1399 hid_hw_stop(hdev); 1400 } 1401 1402 static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report, 1403 u8 *data, int size) 1404 { 1405 struct cp2112_device *dev = hid_get_drvdata(hdev); 1406 struct cp2112_xfer_status_report *xfer = (void *)data; 1407 1408 switch (data[0]) { 1409 case CP2112_TRANSFER_STATUS_RESPONSE: 1410 hid_dbg(hdev, "xfer status: %02x %02x %04x %04x\n", 1411 xfer->status0, xfer->status1, 1412 be16_to_cpu(xfer->retries), be16_to_cpu(xfer->length)); 1413 1414 switch (xfer->status0) { 1415 case STATUS0_IDLE: 1416 dev->xfer_status = -EAGAIN; 1417 break; 1418 case STATUS0_BUSY: 1419 dev->xfer_status = -EBUSY; 1420 break; 1421 case STATUS0_COMPLETE: 1422 dev->xfer_status = be16_to_cpu(xfer->length); 1423 break; 1424 case STATUS0_ERROR: 1425 switch (xfer->status1) { 1426 case STATUS1_TIMEOUT_NACK: 1427 case STATUS1_TIMEOUT_BUS: 1428 dev->xfer_status = -ETIMEDOUT; 1429 break; 1430 default: 1431 dev->xfer_status = -EIO; 1432 break; 1433 } 1434 break; 1435 default: 1436 dev->xfer_status = -EINVAL; 1437 break; 1438 } 1439 1440 atomic_set(&dev->xfer_avail, 1); 1441 break; 1442 case CP2112_DATA_READ_RESPONSE: 1443 hid_dbg(hdev, "read response: %02x %02x\n", data[1], data[2]); 1444 1445 dev->read_length = data[2]; 1446 if (dev->read_length > sizeof(dev->read_data)) 1447 dev->read_length = sizeof(dev->read_data); 1448 1449 memcpy(dev->read_data, &data[3], dev->read_length); 1450 atomic_set(&dev->read_avail, 1); 1451 break; 1452 default: 1453 hid_err(hdev, "unknown report\n"); 1454 1455 return 0; 1456 } 1457 1458 wake_up_interruptible(&dev->wait); 1459 return 1; 1460 } 1461 1462 static struct hid_driver cp2112_driver = { 1463 .name = "cp2112", 1464 .id_table = cp2112_devices, 1465 .probe = cp2112_probe, 1466 .remove = cp2112_remove, 1467 .raw_event = cp2112_raw_event, 1468 }; 1469 1470 module_hid_driver(cp2112_driver); 1471 MODULE_DESCRIPTION("Silicon Labs HID USB to SMBus master bridge"); 1472 MODULE_AUTHOR("David Barksdale <dbarksdale@uplogix.com>"); 1473 MODULE_LICENSE("GPL"); 1474 1475