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/gpio/consumer.h> 20 #include <linux/gpio/machine.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/nls.h> 27 #include <linux/usb/ch9.h> 28 #include "hid-ids.h" 29 30 #define CP2112_REPORT_MAX_LENGTH 64 31 #define CP2112_GPIO_CONFIG_LENGTH 5 32 #define CP2112_GPIO_GET_LENGTH 2 33 #define CP2112_GPIO_SET_LENGTH 3 34 35 enum { 36 CP2112_GPIO_CONFIG = 0x02, 37 CP2112_GPIO_GET = 0x03, 38 CP2112_GPIO_SET = 0x04, 39 CP2112_GET_VERSION_INFO = 0x05, 40 CP2112_SMBUS_CONFIG = 0x06, 41 CP2112_DATA_READ_REQUEST = 0x10, 42 CP2112_DATA_WRITE_READ_REQUEST = 0x11, 43 CP2112_DATA_READ_FORCE_SEND = 0x12, 44 CP2112_DATA_READ_RESPONSE = 0x13, 45 CP2112_DATA_WRITE_REQUEST = 0x14, 46 CP2112_TRANSFER_STATUS_REQUEST = 0x15, 47 CP2112_TRANSFER_STATUS_RESPONSE = 0x16, 48 CP2112_CANCEL_TRANSFER = 0x17, 49 CP2112_LOCK_BYTE = 0x20, 50 CP2112_USB_CONFIG = 0x21, 51 CP2112_MANUFACTURER_STRING = 0x22, 52 CP2112_PRODUCT_STRING = 0x23, 53 CP2112_SERIAL_STRING = 0x24, 54 }; 55 56 enum { 57 STATUS0_IDLE = 0x00, 58 STATUS0_BUSY = 0x01, 59 STATUS0_COMPLETE = 0x02, 60 STATUS0_ERROR = 0x03, 61 }; 62 63 enum { 64 STATUS1_TIMEOUT_NACK = 0x00, 65 STATUS1_TIMEOUT_BUS = 0x01, 66 STATUS1_ARBITRATION_LOST = 0x02, 67 STATUS1_READ_INCOMPLETE = 0x03, 68 STATUS1_WRITE_INCOMPLETE = 0x04, 69 STATUS1_SUCCESS = 0x05, 70 }; 71 72 struct cp2112_smbus_config_report { 73 u8 report; /* CP2112_SMBUS_CONFIG */ 74 __be32 clock_speed; /* Hz */ 75 u8 device_address; /* Stored in the upper 7 bits */ 76 u8 auto_send_read; /* 1 = enabled, 0 = disabled */ 77 __be16 write_timeout; /* ms, 0 = no timeout */ 78 __be16 read_timeout; /* ms, 0 = no timeout */ 79 u8 scl_low_timeout; /* 1 = enabled, 0 = disabled */ 80 __be16 retry_time; /* # of retries, 0 = no limit */ 81 } __packed; 82 83 struct cp2112_usb_config_report { 84 u8 report; /* CP2112_USB_CONFIG */ 85 __le16 vid; /* Vendor ID */ 86 __le16 pid; /* Product ID */ 87 u8 max_power; /* Power requested in 2mA units */ 88 u8 power_mode; /* 0x00 = bus powered 89 0x01 = self powered & regulator off 90 0x02 = self powered & regulator on */ 91 u8 release_major; 92 u8 release_minor; 93 u8 mask; /* What fields to program */ 94 } __packed; 95 96 struct cp2112_read_req_report { 97 u8 report; /* CP2112_DATA_READ_REQUEST */ 98 u8 slave_address; 99 __be16 length; 100 } __packed; 101 102 struct cp2112_write_read_req_report { 103 u8 report; /* CP2112_DATA_WRITE_READ_REQUEST */ 104 u8 slave_address; 105 __be16 length; 106 u8 target_address_length; 107 u8 target_address[16]; 108 } __packed; 109 110 struct cp2112_write_req_report { 111 u8 report; /* CP2112_DATA_WRITE_REQUEST */ 112 u8 slave_address; 113 u8 length; 114 u8 data[61]; 115 } __packed; 116 117 struct cp2112_force_read_report { 118 u8 report; /* CP2112_DATA_READ_FORCE_SEND */ 119 __be16 length; 120 } __packed; 121 122 struct cp2112_xfer_status_report { 123 u8 report; /* CP2112_TRANSFER_STATUS_RESPONSE */ 124 u8 status0; /* STATUS0_* */ 125 u8 status1; /* STATUS1_* */ 126 __be16 retries; 127 __be16 length; 128 } __packed; 129 130 struct cp2112_string_report { 131 u8 dummy; /* force .string to be aligned */ 132 u8 report; /* CP2112_*_STRING */ 133 u8 length; /* length in bytes of everyting after .report */ 134 u8 type; /* USB_DT_STRING */ 135 wchar_t string[30]; /* UTF16_LITTLE_ENDIAN string */ 136 } __packed; 137 138 /* Number of times to request transfer status before giving up waiting for a 139 transfer to complete. This may need to be changed if SMBUS clock, retries, 140 or read/write/scl_low timeout settings are changed. */ 141 static const int XFER_STATUS_RETRIES = 10; 142 143 /* Time in ms to wait for a CP2112_DATA_READ_RESPONSE or 144 CP2112_TRANSFER_STATUS_RESPONSE. */ 145 static const int RESPONSE_TIMEOUT = 50; 146 147 static const struct hid_device_id cp2112_devices[] = { 148 { HID_USB_DEVICE(USB_VENDOR_ID_CYGNAL, USB_DEVICE_ID_CYGNAL_CP2112) }, 149 { } 150 }; 151 MODULE_DEVICE_TABLE(hid, cp2112_devices); 152 153 struct cp2112_device { 154 struct i2c_adapter adap; 155 struct hid_device *hdev; 156 wait_queue_head_t wait; 157 u8 read_data[61]; 158 u8 read_length; 159 u8 hwversion; 160 int xfer_status; 161 atomic_t read_avail; 162 atomic_t xfer_avail; 163 struct gpio_chip gc; 164 struct irq_chip irq; 165 u8 *in_out_buffer; 166 struct mutex lock; 167 168 struct gpio_desc *desc[8]; 169 bool gpio_poll; 170 struct delayed_work gpio_poll_worker; 171 unsigned long irq_mask; 172 u8 gpio_prev_state; 173 }; 174 175 static int gpio_push_pull = 0xFF; 176 module_param(gpio_push_pull, int, S_IRUGO | S_IWUSR); 177 MODULE_PARM_DESC(gpio_push_pull, "GPIO push-pull configuration bitmask"); 178 179 static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset) 180 { 181 struct cp2112_device *dev = gpiochip_get_data(chip); 182 struct hid_device *hdev = dev->hdev; 183 u8 *buf = dev->in_out_buffer; 184 int ret; 185 186 mutex_lock(&dev->lock); 187 188 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, 189 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, 190 HID_REQ_GET_REPORT); 191 if (ret != CP2112_GPIO_CONFIG_LENGTH) { 192 hid_err(hdev, "error requesting GPIO config: %d\n", ret); 193 if (ret >= 0) 194 ret = -EIO; 195 goto exit; 196 } 197 198 buf[1] &= ~(1 << offset); 199 buf[2] = gpio_push_pull; 200 201 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, 202 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, 203 HID_REQ_SET_REPORT); 204 if (ret != CP2112_GPIO_CONFIG_LENGTH) { 205 hid_err(hdev, "error setting GPIO config: %d\n", ret); 206 if (ret >= 0) 207 ret = -EIO; 208 goto exit; 209 } 210 211 ret = 0; 212 213 exit: 214 mutex_unlock(&dev->lock); 215 return ret; 216 } 217 218 static void cp2112_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 219 { 220 struct cp2112_device *dev = gpiochip_get_data(chip); 221 struct hid_device *hdev = dev->hdev; 222 u8 *buf = dev->in_out_buffer; 223 int ret; 224 225 mutex_lock(&dev->lock); 226 227 buf[0] = CP2112_GPIO_SET; 228 buf[1] = value ? 0xff : 0; 229 buf[2] = 1 << offset; 230 231 ret = hid_hw_raw_request(hdev, CP2112_GPIO_SET, buf, 232 CP2112_GPIO_SET_LENGTH, HID_FEATURE_REPORT, 233 HID_REQ_SET_REPORT); 234 if (ret < 0) 235 hid_err(hdev, "error setting GPIO values: %d\n", ret); 236 237 mutex_unlock(&dev->lock); 238 } 239 240 static int cp2112_gpio_get_all(struct gpio_chip *chip) 241 { 242 struct cp2112_device *dev = gpiochip_get_data(chip); 243 struct hid_device *hdev = dev->hdev; 244 u8 *buf = dev->in_out_buffer; 245 int ret; 246 247 mutex_lock(&dev->lock); 248 249 ret = hid_hw_raw_request(hdev, CP2112_GPIO_GET, buf, 250 CP2112_GPIO_GET_LENGTH, HID_FEATURE_REPORT, 251 HID_REQ_GET_REPORT); 252 if (ret != CP2112_GPIO_GET_LENGTH) { 253 hid_err(hdev, "error requesting GPIO values: %d\n", ret); 254 ret = ret < 0 ? ret : -EIO; 255 goto exit; 256 } 257 258 ret = buf[1]; 259 260 exit: 261 mutex_unlock(&dev->lock); 262 263 return ret; 264 } 265 266 static int cp2112_gpio_get(struct gpio_chip *chip, unsigned int offset) 267 { 268 int ret; 269 270 ret = cp2112_gpio_get_all(chip); 271 if (ret < 0) 272 return ret; 273 274 return (ret >> offset) & 1; 275 } 276 277 static int cp2112_gpio_direction_output(struct gpio_chip *chip, 278 unsigned offset, int value) 279 { 280 struct cp2112_device *dev = gpiochip_get_data(chip); 281 struct hid_device *hdev = dev->hdev; 282 u8 *buf = dev->in_out_buffer; 283 int ret; 284 285 mutex_lock(&dev->lock); 286 287 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, 288 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, 289 HID_REQ_GET_REPORT); 290 if (ret != CP2112_GPIO_CONFIG_LENGTH) { 291 hid_err(hdev, "error requesting GPIO config: %d\n", ret); 292 goto fail; 293 } 294 295 buf[1] |= 1 << offset; 296 buf[2] = gpio_push_pull; 297 298 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, 299 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, 300 HID_REQ_SET_REPORT); 301 if (ret < 0) { 302 hid_err(hdev, "error setting GPIO config: %d\n", ret); 303 goto fail; 304 } 305 306 mutex_unlock(&dev->lock); 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(chip, offset, value); 313 314 return 0; 315 316 fail: 317 mutex_unlock(&dev->lock); 318 return ret < 0 ? ret : -EIO; 319 } 320 321 static int cp2112_hid_get(struct hid_device *hdev, unsigned char report_number, 322 u8 *data, size_t count, unsigned char report_type) 323 { 324 u8 *buf; 325 int ret; 326 327 buf = kmalloc(count, GFP_KERNEL); 328 if (!buf) 329 return -ENOMEM; 330 331 ret = hid_hw_raw_request(hdev, report_number, buf, count, 332 report_type, HID_REQ_GET_REPORT); 333 memcpy(data, buf, count); 334 kfree(buf); 335 return ret; 336 } 337 338 static int cp2112_hid_output(struct hid_device *hdev, u8 *data, size_t count, 339 unsigned char report_type) 340 { 341 u8 *buf; 342 int ret; 343 344 buf = kmemdup(data, count, GFP_KERNEL); 345 if (!buf) 346 return -ENOMEM; 347 348 if (report_type == HID_OUTPUT_REPORT) 349 ret = hid_hw_output_report(hdev, buf, count); 350 else 351 ret = hid_hw_raw_request(hdev, buf[0], buf, count, report_type, 352 HID_REQ_SET_REPORT); 353 354 kfree(buf); 355 return ret; 356 } 357 358 static int cp2112_wait(struct cp2112_device *dev, atomic_t *avail) 359 { 360 int ret = 0; 361 362 /* We have sent either a CP2112_TRANSFER_STATUS_REQUEST or a 363 * CP2112_DATA_READ_FORCE_SEND and we are waiting for the response to 364 * come in cp2112_raw_event or timeout. There will only be one of these 365 * in flight at any one time. The timeout is extremely large and is a 366 * last resort if the CP2112 has died. If we do timeout we don't expect 367 * to receive the response which would cause data races, it's not like 368 * we can do anything about it anyway. 369 */ 370 ret = wait_event_interruptible_timeout(dev->wait, 371 atomic_read(avail), msecs_to_jiffies(RESPONSE_TIMEOUT)); 372 if (-ERESTARTSYS == ret) 373 return ret; 374 if (!ret) 375 return -ETIMEDOUT; 376 377 atomic_set(avail, 0); 378 return 0; 379 } 380 381 static int cp2112_xfer_status(struct cp2112_device *dev) 382 { 383 struct hid_device *hdev = dev->hdev; 384 u8 buf[2]; 385 int ret; 386 387 buf[0] = CP2112_TRANSFER_STATUS_REQUEST; 388 buf[1] = 0x01; 389 atomic_set(&dev->xfer_avail, 0); 390 391 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); 392 if (ret < 0) { 393 hid_warn(hdev, "Error requesting status: %d\n", ret); 394 return ret; 395 } 396 397 ret = cp2112_wait(dev, &dev->xfer_avail); 398 if (ret) 399 return ret; 400 401 return dev->xfer_status; 402 } 403 404 static int cp2112_read(struct cp2112_device *dev, u8 *data, size_t size) 405 { 406 struct hid_device *hdev = dev->hdev; 407 struct cp2112_force_read_report report; 408 int ret; 409 410 if (size > sizeof(dev->read_data)) 411 size = sizeof(dev->read_data); 412 report.report = CP2112_DATA_READ_FORCE_SEND; 413 report.length = cpu_to_be16(size); 414 415 atomic_set(&dev->read_avail, 0); 416 417 ret = cp2112_hid_output(hdev, &report.report, sizeof(report), 418 HID_OUTPUT_REPORT); 419 if (ret < 0) { 420 hid_warn(hdev, "Error requesting data: %d\n", ret); 421 return ret; 422 } 423 424 ret = cp2112_wait(dev, &dev->read_avail); 425 if (ret) 426 return ret; 427 428 hid_dbg(hdev, "read %d of %zd bytes requested\n", 429 dev->read_length, size); 430 431 if (size > dev->read_length) 432 size = dev->read_length; 433 434 memcpy(data, dev->read_data, size); 435 return dev->read_length; 436 } 437 438 static int cp2112_read_req(void *buf, u8 slave_address, u16 length) 439 { 440 struct cp2112_read_req_report *report = buf; 441 442 if (length < 1 || length > 512) 443 return -EINVAL; 444 445 report->report = CP2112_DATA_READ_REQUEST; 446 report->slave_address = slave_address << 1; 447 report->length = cpu_to_be16(length); 448 return sizeof(*report); 449 } 450 451 static int cp2112_write_read_req(void *buf, u8 slave_address, u16 length, 452 u8 command, u8 *data, u8 data_length) 453 { 454 struct cp2112_write_read_req_report *report = buf; 455 456 if (length < 1 || length > 512 457 || data_length > sizeof(report->target_address) - 1) 458 return -EINVAL; 459 460 report->report = CP2112_DATA_WRITE_READ_REQUEST; 461 report->slave_address = slave_address << 1; 462 report->length = cpu_to_be16(length); 463 report->target_address_length = data_length + 1; 464 report->target_address[0] = command; 465 memcpy(&report->target_address[1], data, data_length); 466 return data_length + 6; 467 } 468 469 static int cp2112_write_req(void *buf, u8 slave_address, u8 command, u8 *data, 470 u8 data_length) 471 { 472 struct cp2112_write_req_report *report = buf; 473 474 if (data_length > sizeof(report->data) - 1) 475 return -EINVAL; 476 477 report->report = CP2112_DATA_WRITE_REQUEST; 478 report->slave_address = slave_address << 1; 479 report->length = data_length + 1; 480 report->data[0] = command; 481 memcpy(&report->data[1], data, data_length); 482 return data_length + 4; 483 } 484 485 static int cp2112_i2c_write_req(void *buf, u8 slave_address, u8 *data, 486 u8 data_length) 487 { 488 struct cp2112_write_req_report *report = buf; 489 490 if (data_length > sizeof(report->data)) 491 return -EINVAL; 492 493 report->report = CP2112_DATA_WRITE_REQUEST; 494 report->slave_address = slave_address << 1; 495 report->length = data_length; 496 memcpy(report->data, data, data_length); 497 return data_length + 3; 498 } 499 500 static int cp2112_i2c_write_read_req(void *buf, u8 slave_address, 501 u8 *addr, int addr_length, 502 int read_length) 503 { 504 struct cp2112_write_read_req_report *report = buf; 505 506 if (read_length < 1 || read_length > 512 || 507 addr_length > sizeof(report->target_address)) 508 return -EINVAL; 509 510 report->report = CP2112_DATA_WRITE_READ_REQUEST; 511 report->slave_address = slave_address << 1; 512 report->length = cpu_to_be16(read_length); 513 report->target_address_length = addr_length; 514 memcpy(report->target_address, addr, addr_length); 515 return addr_length + 5; 516 } 517 518 static int cp2112_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, 519 int num) 520 { 521 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; 522 struct hid_device *hdev = dev->hdev; 523 u8 buf[64]; 524 ssize_t count; 525 ssize_t read_length = 0; 526 u8 *read_buf = NULL; 527 unsigned int retries; 528 int ret; 529 530 hid_dbg(hdev, "I2C %d messages\n", num); 531 532 if (num == 1) { 533 if (msgs->flags & I2C_M_RD) { 534 hid_dbg(hdev, "I2C read %#04x len %d\n", 535 msgs->addr, msgs->len); 536 read_length = msgs->len; 537 read_buf = msgs->buf; 538 count = cp2112_read_req(buf, msgs->addr, msgs->len); 539 } else { 540 hid_dbg(hdev, "I2C write %#04x len %d\n", 541 msgs->addr, msgs->len); 542 count = cp2112_i2c_write_req(buf, msgs->addr, 543 msgs->buf, msgs->len); 544 } 545 if (count < 0) 546 return count; 547 } else if (dev->hwversion > 1 && /* no repeated start in rev 1 */ 548 num == 2 && 549 msgs[0].addr == msgs[1].addr && 550 !(msgs[0].flags & I2C_M_RD) && (msgs[1].flags & I2C_M_RD)) { 551 hid_dbg(hdev, "I2C write-read %#04x wlen %d rlen %d\n", 552 msgs[0].addr, msgs[0].len, msgs[1].len); 553 read_length = msgs[1].len; 554 read_buf = msgs[1].buf; 555 count = cp2112_i2c_write_read_req(buf, msgs[0].addr, 556 msgs[0].buf, msgs[0].len, msgs[1].len); 557 if (count < 0) 558 return count; 559 } else { 560 hid_err(hdev, 561 "Multi-message I2C transactions not supported\n"); 562 return -EOPNOTSUPP; 563 } 564 565 ret = hid_hw_power(hdev, PM_HINT_FULLON); 566 if (ret < 0) { 567 hid_err(hdev, "power management error: %d\n", ret); 568 return ret; 569 } 570 571 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); 572 if (ret < 0) { 573 hid_warn(hdev, "Error starting transaction: %d\n", ret); 574 goto power_normal; 575 } 576 577 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { 578 ret = cp2112_xfer_status(dev); 579 if (-EBUSY == ret) 580 continue; 581 if (ret < 0) 582 goto power_normal; 583 break; 584 } 585 586 if (XFER_STATUS_RETRIES <= retries) { 587 hid_warn(hdev, "Transfer timed out, cancelling.\n"); 588 buf[0] = CP2112_CANCEL_TRANSFER; 589 buf[1] = 0x01; 590 591 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); 592 if (ret < 0) 593 hid_warn(hdev, "Error cancelling transaction: %d\n", 594 ret); 595 596 ret = -ETIMEDOUT; 597 goto power_normal; 598 } 599 600 for (count = 0; count < read_length;) { 601 ret = cp2112_read(dev, read_buf + count, read_length - count); 602 if (ret < 0) 603 goto power_normal; 604 if (ret == 0) { 605 hid_err(hdev, "read returned 0\n"); 606 ret = -EIO; 607 goto power_normal; 608 } 609 count += ret; 610 if (count > read_length) { 611 /* 612 * The hardware returned too much data. 613 * This is mostly harmless because cp2112_read() 614 * has a limit check so didn't overrun our 615 * buffer. Nevertheless, we return an error 616 * because something is seriously wrong and 617 * it shouldn't go unnoticed. 618 */ 619 hid_err(hdev, "long read: %d > %zd\n", 620 ret, read_length - count + ret); 621 ret = -EIO; 622 goto power_normal; 623 } 624 } 625 626 /* return the number of transferred messages */ 627 ret = num; 628 629 power_normal: 630 hid_hw_power(hdev, PM_HINT_NORMAL); 631 hid_dbg(hdev, "I2C transfer finished: %d\n", ret); 632 return ret; 633 } 634 635 static int cp2112_xfer(struct i2c_adapter *adap, u16 addr, 636 unsigned short flags, char read_write, u8 command, 637 int size, union i2c_smbus_data *data) 638 { 639 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; 640 struct hid_device *hdev = dev->hdev; 641 u8 buf[64]; 642 __le16 word; 643 ssize_t count; 644 size_t read_length = 0; 645 unsigned int retries; 646 int ret; 647 648 hid_dbg(hdev, "%s addr 0x%x flags 0x%x cmd 0x%x size %d\n", 649 read_write == I2C_SMBUS_WRITE ? "write" : "read", 650 addr, flags, command, size); 651 652 switch (size) { 653 case I2C_SMBUS_BYTE: 654 read_length = 1; 655 656 if (I2C_SMBUS_READ == read_write) 657 count = cp2112_read_req(buf, addr, read_length); 658 else 659 count = cp2112_write_req(buf, addr, command, NULL, 660 0); 661 break; 662 case I2C_SMBUS_BYTE_DATA: 663 read_length = 1; 664 665 if (I2C_SMBUS_READ == read_write) 666 count = cp2112_write_read_req(buf, addr, read_length, 667 command, NULL, 0); 668 else 669 count = cp2112_write_req(buf, addr, command, 670 &data->byte, 1); 671 break; 672 case I2C_SMBUS_WORD_DATA: 673 read_length = 2; 674 word = cpu_to_le16(data->word); 675 676 if (I2C_SMBUS_READ == read_write) 677 count = cp2112_write_read_req(buf, addr, read_length, 678 command, NULL, 0); 679 else 680 count = cp2112_write_req(buf, addr, command, 681 (u8 *)&word, 2); 682 break; 683 case I2C_SMBUS_PROC_CALL: 684 size = I2C_SMBUS_WORD_DATA; 685 read_write = I2C_SMBUS_READ; 686 read_length = 2; 687 word = cpu_to_le16(data->word); 688 689 count = cp2112_write_read_req(buf, addr, read_length, command, 690 (u8 *)&word, 2); 691 break; 692 case I2C_SMBUS_I2C_BLOCK_DATA: 693 if (read_write == I2C_SMBUS_READ) { 694 read_length = data->block[0]; 695 count = cp2112_write_read_req(buf, addr, read_length, 696 command, NULL, 0); 697 } else { 698 count = cp2112_write_req(buf, addr, command, 699 data->block + 1, 700 data->block[0]); 701 } 702 break; 703 case I2C_SMBUS_BLOCK_DATA: 704 if (I2C_SMBUS_READ == read_write) { 705 count = cp2112_write_read_req(buf, addr, 706 I2C_SMBUS_BLOCK_MAX, 707 command, NULL, 0); 708 } else { 709 count = cp2112_write_req(buf, addr, command, 710 data->block, 711 data->block[0] + 1); 712 } 713 break; 714 case I2C_SMBUS_BLOCK_PROC_CALL: 715 size = I2C_SMBUS_BLOCK_DATA; 716 read_write = I2C_SMBUS_READ; 717 718 count = cp2112_write_read_req(buf, addr, I2C_SMBUS_BLOCK_MAX, 719 command, data->block, 720 data->block[0] + 1); 721 break; 722 default: 723 hid_warn(hdev, "Unsupported transaction %d\n", size); 724 return -EOPNOTSUPP; 725 } 726 727 if (count < 0) 728 return count; 729 730 ret = hid_hw_power(hdev, PM_HINT_FULLON); 731 if (ret < 0) { 732 hid_err(hdev, "power management error: %d\n", ret); 733 return ret; 734 } 735 736 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); 737 if (ret < 0) { 738 hid_warn(hdev, "Error starting transaction: %d\n", ret); 739 goto power_normal; 740 } 741 742 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { 743 ret = cp2112_xfer_status(dev); 744 if (-EBUSY == ret) 745 continue; 746 if (ret < 0) 747 goto power_normal; 748 break; 749 } 750 751 if (XFER_STATUS_RETRIES <= retries) { 752 hid_warn(hdev, "Transfer timed out, cancelling.\n"); 753 buf[0] = CP2112_CANCEL_TRANSFER; 754 buf[1] = 0x01; 755 756 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); 757 if (ret < 0) 758 hid_warn(hdev, "Error cancelling transaction: %d\n", 759 ret); 760 761 ret = -ETIMEDOUT; 762 goto power_normal; 763 } 764 765 if (I2C_SMBUS_WRITE == read_write) { 766 ret = 0; 767 goto power_normal; 768 } 769 770 if (I2C_SMBUS_BLOCK_DATA == size) 771 read_length = ret; 772 773 ret = cp2112_read(dev, buf, read_length); 774 if (ret < 0) 775 goto power_normal; 776 if (ret != read_length) { 777 hid_warn(hdev, "short read: %d < %zd\n", ret, read_length); 778 ret = -EIO; 779 goto power_normal; 780 } 781 782 switch (size) { 783 case I2C_SMBUS_BYTE: 784 case I2C_SMBUS_BYTE_DATA: 785 data->byte = buf[0]; 786 break; 787 case I2C_SMBUS_WORD_DATA: 788 data->word = le16_to_cpup((__le16 *)buf); 789 break; 790 case I2C_SMBUS_I2C_BLOCK_DATA: 791 memcpy(data->block + 1, buf, read_length); 792 break; 793 case I2C_SMBUS_BLOCK_DATA: 794 if (read_length > I2C_SMBUS_BLOCK_MAX) { 795 ret = -EPROTO; 796 goto power_normal; 797 } 798 799 memcpy(data->block, buf, read_length); 800 break; 801 } 802 803 ret = 0; 804 power_normal: 805 hid_hw_power(hdev, PM_HINT_NORMAL); 806 hid_dbg(hdev, "transfer finished: %d\n", ret); 807 return ret; 808 } 809 810 static u32 cp2112_functionality(struct i2c_adapter *adap) 811 { 812 return I2C_FUNC_I2C | 813 I2C_FUNC_SMBUS_BYTE | 814 I2C_FUNC_SMBUS_BYTE_DATA | 815 I2C_FUNC_SMBUS_WORD_DATA | 816 I2C_FUNC_SMBUS_BLOCK_DATA | 817 I2C_FUNC_SMBUS_I2C_BLOCK | 818 I2C_FUNC_SMBUS_PROC_CALL | 819 I2C_FUNC_SMBUS_BLOCK_PROC_CALL; 820 } 821 822 static const struct i2c_algorithm smbus_algorithm = { 823 .master_xfer = cp2112_i2c_xfer, 824 .smbus_xfer = cp2112_xfer, 825 .functionality = cp2112_functionality, 826 }; 827 828 static int cp2112_get_usb_config(struct hid_device *hdev, 829 struct cp2112_usb_config_report *cfg) 830 { 831 int ret; 832 833 ret = cp2112_hid_get(hdev, CP2112_USB_CONFIG, (u8 *)cfg, sizeof(*cfg), 834 HID_FEATURE_REPORT); 835 if (ret != sizeof(*cfg)) { 836 hid_err(hdev, "error reading usb config: %d\n", ret); 837 if (ret < 0) 838 return ret; 839 return -EIO; 840 } 841 842 return 0; 843 } 844 845 static int cp2112_set_usb_config(struct hid_device *hdev, 846 struct cp2112_usb_config_report *cfg) 847 { 848 int ret; 849 850 BUG_ON(cfg->report != CP2112_USB_CONFIG); 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 scnprintf(buf, PAGE_SIZE, 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 struct cp2112_pstring_attribute { 943 struct device_attribute attr; 944 unsigned char report; 945 }; 946 947 static ssize_t pstr_store(struct device *kdev, 948 struct device_attribute *kattr, const char *buf, 949 size_t count) 950 { 951 struct hid_device *hdev = to_hid_device(kdev); 952 struct cp2112_pstring_attribute *attr = 953 container_of(kattr, struct cp2112_pstring_attribute, attr); 954 struct cp2112_string_report report; 955 int ret; 956 957 memset(&report, 0, sizeof(report)); 958 959 ret = utf8s_to_utf16s(buf, count, UTF16_LITTLE_ENDIAN, 960 report.string, ARRAY_SIZE(report.string)); 961 report.report = attr->report; 962 report.length = ret * sizeof(report.string[0]) + 2; 963 report.type = USB_DT_STRING; 964 965 ret = cp2112_hid_output(hdev, &report.report, report.length + 1, 966 HID_FEATURE_REPORT); 967 if (ret != report.length + 1) { 968 hid_err(hdev, "error writing %s string: %d\n", kattr->attr.name, 969 ret); 970 if (ret < 0) 971 return ret; 972 return -EIO; 973 } 974 975 chmod_sysfs_attrs(hdev); 976 return count; 977 } 978 979 static ssize_t pstr_show(struct device *kdev, 980 struct device_attribute *kattr, char *buf) 981 { 982 struct hid_device *hdev = to_hid_device(kdev); 983 struct cp2112_pstring_attribute *attr = 984 container_of(kattr, struct cp2112_pstring_attribute, attr); 985 struct cp2112_string_report report; 986 u8 length; 987 int ret; 988 989 ret = cp2112_hid_get(hdev, attr->report, &report.report, 990 sizeof(report) - 1, HID_FEATURE_REPORT); 991 if (ret < 3) { 992 hid_err(hdev, "error reading %s string: %d\n", kattr->attr.name, 993 ret); 994 if (ret < 0) 995 return ret; 996 return -EIO; 997 } 998 999 if (report.length < 2) { 1000 hid_err(hdev, "invalid %s string length: %d\n", 1001 kattr->attr.name, report.length); 1002 return -EIO; 1003 } 1004 1005 length = report.length > ret - 1 ? ret - 1 : report.length; 1006 length = (length - 2) / sizeof(report.string[0]); 1007 ret = utf16s_to_utf8s(report.string, length, UTF16_LITTLE_ENDIAN, buf, 1008 PAGE_SIZE - 1); 1009 buf[ret++] = '\n'; 1010 return ret; 1011 } 1012 1013 #define CP2112_PSTR_ATTR(name, _report) \ 1014 static struct cp2112_pstring_attribute dev_attr_##name = { \ 1015 .attr = __ATTR(name, (S_IWUSR | S_IRUGO), pstr_show, pstr_store), \ 1016 .report = _report, \ 1017 }; 1018 1019 CP2112_PSTR_ATTR(manufacturer, CP2112_MANUFACTURER_STRING); 1020 CP2112_PSTR_ATTR(product, CP2112_PRODUCT_STRING); 1021 CP2112_PSTR_ATTR(serial, CP2112_SERIAL_STRING); 1022 1023 #undef CP2112_PSTR_ATTR 1024 1025 static const struct attribute_group cp2112_attr_group = { 1026 .attrs = (struct attribute *[]){ 1027 &dev_attr_vendor_id.attr, 1028 &dev_attr_product_id.attr, 1029 &dev_attr_max_power.attr, 1030 &dev_attr_power_mode.attr, 1031 &dev_attr_release_version.attr, 1032 &dev_attr_manufacturer.attr.attr, 1033 &dev_attr_product.attr.attr, 1034 &dev_attr_serial.attr.attr, 1035 NULL 1036 } 1037 }; 1038 1039 /* Chmoding our sysfs attributes is simply a way to expose which fields in the 1040 * PROM have already been programmed. We do not depend on this preventing 1041 * writing to these attributes since the CP2112 will simply ignore writes to 1042 * already-programmed fields. This is why there is no sense in fixing this 1043 * racy behaviour. 1044 */ 1045 static void chmod_sysfs_attrs(struct hid_device *hdev) 1046 { 1047 struct attribute **attr; 1048 u8 buf[2]; 1049 int ret; 1050 1051 ret = cp2112_hid_get(hdev, CP2112_LOCK_BYTE, buf, sizeof(buf), 1052 HID_FEATURE_REPORT); 1053 if (ret != sizeof(buf)) { 1054 hid_err(hdev, "error reading lock byte: %d\n", ret); 1055 return; 1056 } 1057 1058 for (attr = cp2112_attr_group.attrs; *attr; ++attr) { 1059 umode_t mode = (buf[1] & 1) ? S_IWUSR | S_IRUGO : S_IRUGO; 1060 ret = sysfs_chmod_file(&hdev->dev.kobj, *attr, mode); 1061 if (ret < 0) 1062 hid_err(hdev, "error chmoding sysfs file %s\n", 1063 (*attr)->name); 1064 buf[1] >>= 1; 1065 } 1066 } 1067 1068 static void cp2112_gpio_irq_ack(struct irq_data *d) 1069 { 1070 } 1071 1072 static void cp2112_gpio_irq_mask(struct irq_data *d) 1073 { 1074 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1075 struct cp2112_device *dev = gpiochip_get_data(gc); 1076 1077 __clear_bit(d->hwirq, &dev->irq_mask); 1078 } 1079 1080 static void cp2112_gpio_irq_unmask(struct irq_data *d) 1081 { 1082 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1083 struct cp2112_device *dev = gpiochip_get_data(gc); 1084 1085 __set_bit(d->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 struct irq_data *d; 1093 u8 gpio_mask; 1094 u8 virqs = (u8)dev->irq_mask; 1095 u32 irq_type; 1096 int irq, virq, ret; 1097 1098 ret = cp2112_gpio_get_all(&dev->gc); 1099 if (ret == -ENODEV) /* the hardware has been disconnected */ 1100 return; 1101 if (ret < 0) 1102 goto exit; 1103 1104 gpio_mask = ret; 1105 1106 while (virqs) { 1107 virq = ffs(virqs) - 1; 1108 virqs &= ~BIT(virq); 1109 1110 if (!dev->gc.to_irq) 1111 break; 1112 1113 irq = dev->gc.to_irq(&dev->gc, virq); 1114 1115 d = irq_get_irq_data(irq); 1116 if (!d) 1117 continue; 1118 1119 irq_type = irqd_get_trigger_type(d); 1120 1121 if (gpio_mask & BIT(virq)) { 1122 /* Level High */ 1123 1124 if (irq_type & IRQ_TYPE_LEVEL_HIGH) 1125 handle_nested_irq(irq); 1126 1127 if ((irq_type & IRQ_TYPE_EDGE_RISING) && 1128 !(dev->gpio_prev_state & BIT(virq))) 1129 handle_nested_irq(irq); 1130 } else { 1131 /* Level Low */ 1132 1133 if (irq_type & IRQ_TYPE_LEVEL_LOW) 1134 handle_nested_irq(irq); 1135 1136 if ((irq_type & IRQ_TYPE_EDGE_FALLING) && 1137 (dev->gpio_prev_state & BIT(virq))) 1138 handle_nested_irq(irq); 1139 } 1140 } 1141 1142 dev->gpio_prev_state = gpio_mask; 1143 1144 exit: 1145 if (dev->gpio_poll) 1146 schedule_delayed_work(&dev->gpio_poll_worker, 10); 1147 } 1148 1149 1150 static unsigned int cp2112_gpio_irq_startup(struct irq_data *d) 1151 { 1152 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1153 struct cp2112_device *dev = gpiochip_get_data(gc); 1154 1155 INIT_DELAYED_WORK(&dev->gpio_poll_worker, cp2112_gpio_poll_callback); 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 int __maybe_unused cp2112_allocate_irq(struct cp2112_device *dev, 1180 int pin) 1181 { 1182 int ret; 1183 1184 if (dev->desc[pin]) 1185 return -EINVAL; 1186 1187 dev->desc[pin] = gpiochip_request_own_desc(&dev->gc, pin, 1188 "HID/I2C:Event", 1189 GPIO_ACTIVE_HIGH, 1190 GPIOD_IN); 1191 if (IS_ERR(dev->desc[pin])) { 1192 dev_err(dev->gc.parent, "Failed to request GPIO\n"); 1193 return PTR_ERR(dev->desc[pin]); 1194 } 1195 1196 ret = cp2112_gpio_direction_input(&dev->gc, pin); 1197 if (ret < 0) { 1198 dev_err(dev->gc.parent, "Failed to set GPIO to input dir\n"); 1199 goto err_desc; 1200 } 1201 1202 ret = gpiochip_lock_as_irq(&dev->gc, pin); 1203 if (ret) { 1204 dev_err(dev->gc.parent, "Failed to lock GPIO as interrupt\n"); 1205 goto err_desc; 1206 } 1207 1208 ret = gpiod_to_irq(dev->desc[pin]); 1209 if (ret < 0) { 1210 dev_err(dev->gc.parent, "Failed to translate GPIO to IRQ\n"); 1211 goto err_lock; 1212 } 1213 1214 return ret; 1215 1216 err_lock: 1217 gpiochip_unlock_as_irq(&dev->gc, pin); 1218 err_desc: 1219 gpiochip_free_own_desc(dev->desc[pin]); 1220 dev->desc[pin] = NULL; 1221 return ret; 1222 } 1223 1224 static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id) 1225 { 1226 struct cp2112_device *dev; 1227 u8 buf[3]; 1228 struct cp2112_smbus_config_report config; 1229 struct gpio_irq_chip *girq; 1230 int ret; 1231 1232 dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL); 1233 if (!dev) 1234 return -ENOMEM; 1235 1236 dev->in_out_buffer = devm_kzalloc(&hdev->dev, CP2112_REPORT_MAX_LENGTH, 1237 GFP_KERNEL); 1238 if (!dev->in_out_buffer) 1239 return -ENOMEM; 1240 1241 mutex_init(&dev->lock); 1242 1243 ret = hid_parse(hdev); 1244 if (ret) { 1245 hid_err(hdev, "parse failed\n"); 1246 return ret; 1247 } 1248 1249 ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW); 1250 if (ret) { 1251 hid_err(hdev, "hw start failed\n"); 1252 return ret; 1253 } 1254 1255 ret = hid_hw_open(hdev); 1256 if (ret) { 1257 hid_err(hdev, "hw open failed\n"); 1258 goto err_hid_stop; 1259 } 1260 1261 ret = hid_hw_power(hdev, PM_HINT_FULLON); 1262 if (ret < 0) { 1263 hid_err(hdev, "power management error: %d\n", ret); 1264 goto err_hid_close; 1265 } 1266 1267 ret = cp2112_hid_get(hdev, CP2112_GET_VERSION_INFO, buf, sizeof(buf), 1268 HID_FEATURE_REPORT); 1269 if (ret != sizeof(buf)) { 1270 hid_err(hdev, "error requesting version\n"); 1271 if (ret >= 0) 1272 ret = -EIO; 1273 goto err_power_normal; 1274 } 1275 1276 hid_info(hdev, "Part Number: 0x%02X Device Version: 0x%02X\n", 1277 buf[1], buf[2]); 1278 1279 ret = cp2112_hid_get(hdev, CP2112_SMBUS_CONFIG, (u8 *)&config, 1280 sizeof(config), HID_FEATURE_REPORT); 1281 if (ret != sizeof(config)) { 1282 hid_err(hdev, "error requesting SMBus config\n"); 1283 if (ret >= 0) 1284 ret = -EIO; 1285 goto err_power_normal; 1286 } 1287 1288 config.retry_time = cpu_to_be16(1); 1289 1290 ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config), 1291 HID_FEATURE_REPORT); 1292 if (ret != sizeof(config)) { 1293 hid_err(hdev, "error setting SMBus config\n"); 1294 if (ret >= 0) 1295 ret = -EIO; 1296 goto err_power_normal; 1297 } 1298 1299 hid_set_drvdata(hdev, (void *)dev); 1300 dev->hdev = hdev; 1301 dev->adap.owner = THIS_MODULE; 1302 dev->adap.class = I2C_CLASS_HWMON; 1303 dev->adap.algo = &smbus_algorithm; 1304 dev->adap.algo_data = dev; 1305 dev->adap.dev.parent = &hdev->dev; 1306 snprintf(dev->adap.name, sizeof(dev->adap.name), 1307 "CP2112 SMBus Bridge on hidraw%d", 1308 ((struct hidraw *)hdev->hidraw)->minor); 1309 dev->hwversion = buf[2]; 1310 init_waitqueue_head(&dev->wait); 1311 1312 hid_device_io_start(hdev); 1313 ret = i2c_add_adapter(&dev->adap); 1314 hid_device_io_stop(hdev); 1315 1316 if (ret) { 1317 hid_err(hdev, "error registering i2c adapter\n"); 1318 goto err_power_normal; 1319 } 1320 1321 hid_dbg(hdev, "adapter registered\n"); 1322 1323 dev->gc.label = "cp2112_gpio"; 1324 dev->gc.direction_input = cp2112_gpio_direction_input; 1325 dev->gc.direction_output = cp2112_gpio_direction_output; 1326 dev->gc.set = cp2112_gpio_set; 1327 dev->gc.get = cp2112_gpio_get; 1328 dev->gc.base = -1; 1329 dev->gc.ngpio = 8; 1330 dev->gc.can_sleep = 1; 1331 dev->gc.parent = &hdev->dev; 1332 1333 dev->irq.name = "cp2112-gpio"; 1334 dev->irq.irq_startup = cp2112_gpio_irq_startup; 1335 dev->irq.irq_shutdown = cp2112_gpio_irq_shutdown; 1336 dev->irq.irq_ack = cp2112_gpio_irq_ack; 1337 dev->irq.irq_mask = cp2112_gpio_irq_mask; 1338 dev->irq.irq_unmask = cp2112_gpio_irq_unmask; 1339 dev->irq.irq_set_type = cp2112_gpio_irq_type; 1340 dev->irq.flags = IRQCHIP_MASK_ON_SUSPEND; 1341 1342 girq = &dev->gc.irq; 1343 girq->chip = &dev->irq; 1344 /* The event comes from the outside so no parent handler */ 1345 girq->parent_handler = NULL; 1346 girq->num_parents = 0; 1347 girq->parents = NULL; 1348 girq->default_type = IRQ_TYPE_NONE; 1349 girq->handler = handle_simple_irq; 1350 1351 ret = gpiochip_add_data(&dev->gc, dev); 1352 if (ret < 0) { 1353 hid_err(hdev, "error registering gpio chip\n"); 1354 goto err_free_i2c; 1355 } 1356 1357 ret = sysfs_create_group(&hdev->dev.kobj, &cp2112_attr_group); 1358 if (ret < 0) { 1359 hid_err(hdev, "error creating sysfs attrs\n"); 1360 goto err_gpiochip_remove; 1361 } 1362 1363 chmod_sysfs_attrs(hdev); 1364 hid_hw_power(hdev, PM_HINT_NORMAL); 1365 1366 return ret; 1367 1368 err_gpiochip_remove: 1369 gpiochip_remove(&dev->gc); 1370 err_free_i2c: 1371 i2c_del_adapter(&dev->adap); 1372 err_power_normal: 1373 hid_hw_power(hdev, PM_HINT_NORMAL); 1374 err_hid_close: 1375 hid_hw_close(hdev); 1376 err_hid_stop: 1377 hid_hw_stop(hdev); 1378 return ret; 1379 } 1380 1381 static void cp2112_remove(struct hid_device *hdev) 1382 { 1383 struct cp2112_device *dev = hid_get_drvdata(hdev); 1384 int i; 1385 1386 sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group); 1387 i2c_del_adapter(&dev->adap); 1388 1389 if (dev->gpio_poll) { 1390 dev->gpio_poll = false; 1391 cancel_delayed_work_sync(&dev->gpio_poll_worker); 1392 } 1393 1394 for (i = 0; i < ARRAY_SIZE(dev->desc); i++) { 1395 gpiochip_unlock_as_irq(&dev->gc, i); 1396 gpiochip_free_own_desc(dev->desc[i]); 1397 } 1398 1399 gpiochip_remove(&dev->gc); 1400 /* i2c_del_adapter has finished removing all i2c devices from our 1401 * adapter. Well behaved devices should no longer call our cp2112_xfer 1402 * and should have waited for any pending calls to finish. It has also 1403 * waited for device_unregister(&adap->dev) to complete. Therefore we 1404 * can safely free our struct cp2112_device. 1405 */ 1406 hid_hw_close(hdev); 1407 hid_hw_stop(hdev); 1408 } 1409 1410 static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report, 1411 u8 *data, int size) 1412 { 1413 struct cp2112_device *dev = hid_get_drvdata(hdev); 1414 struct cp2112_xfer_status_report *xfer = (void *)data; 1415 1416 switch (data[0]) { 1417 case CP2112_TRANSFER_STATUS_RESPONSE: 1418 hid_dbg(hdev, "xfer status: %02x %02x %04x %04x\n", 1419 xfer->status0, xfer->status1, 1420 be16_to_cpu(xfer->retries), be16_to_cpu(xfer->length)); 1421 1422 switch (xfer->status0) { 1423 case STATUS0_IDLE: 1424 dev->xfer_status = -EAGAIN; 1425 break; 1426 case STATUS0_BUSY: 1427 dev->xfer_status = -EBUSY; 1428 break; 1429 case STATUS0_COMPLETE: 1430 dev->xfer_status = be16_to_cpu(xfer->length); 1431 break; 1432 case STATUS0_ERROR: 1433 switch (xfer->status1) { 1434 case STATUS1_TIMEOUT_NACK: 1435 case STATUS1_TIMEOUT_BUS: 1436 dev->xfer_status = -ETIMEDOUT; 1437 break; 1438 default: 1439 dev->xfer_status = -EIO; 1440 break; 1441 } 1442 break; 1443 default: 1444 dev->xfer_status = -EINVAL; 1445 break; 1446 } 1447 1448 atomic_set(&dev->xfer_avail, 1); 1449 break; 1450 case CP2112_DATA_READ_RESPONSE: 1451 hid_dbg(hdev, "read response: %02x %02x\n", data[1], data[2]); 1452 1453 dev->read_length = data[2]; 1454 if (dev->read_length > sizeof(dev->read_data)) 1455 dev->read_length = sizeof(dev->read_data); 1456 1457 memcpy(dev->read_data, &data[3], dev->read_length); 1458 atomic_set(&dev->read_avail, 1); 1459 break; 1460 default: 1461 hid_err(hdev, "unknown report\n"); 1462 1463 return 0; 1464 } 1465 1466 wake_up_interruptible(&dev->wait); 1467 return 1; 1468 } 1469 1470 static struct hid_driver cp2112_driver = { 1471 .name = "cp2112", 1472 .id_table = cp2112_devices, 1473 .probe = cp2112_probe, 1474 .remove = cp2112_remove, 1475 .raw_event = cp2112_raw_event, 1476 }; 1477 1478 module_hid_driver(cp2112_driver); 1479 MODULE_DESCRIPTION("Silicon Labs HID USB to SMBus master bridge"); 1480 MODULE_AUTHOR("David Barksdale <dbarksdale@uplogix.com>"); 1481 MODULE_LICENSE("GPL"); 1482 1483