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 struct_group_attr(contents, __packed, 133 u8 report; /* CP2112_*_STRING */ 134 u8 length; /* length in bytes of everything after .report */ 135 u8 type; /* USB_DT_STRING */ 136 wchar_t string[30]; /* UTF16_LITTLE_ENDIAN string */ 137 ); 138 } __packed; 139 140 /* Number of times to request transfer status before giving up waiting for a 141 transfer to complete. This may need to be changed if SMBUS clock, retries, 142 or read/write/scl_low timeout settings are changed. */ 143 static const int XFER_STATUS_RETRIES = 10; 144 145 /* Time in ms to wait for a CP2112_DATA_READ_RESPONSE or 146 CP2112_TRANSFER_STATUS_RESPONSE. */ 147 static const int RESPONSE_TIMEOUT = 50; 148 149 static const struct hid_device_id cp2112_devices[] = { 150 { HID_USB_DEVICE(USB_VENDOR_ID_CYGNAL, USB_DEVICE_ID_CYGNAL_CP2112) }, 151 { } 152 }; 153 MODULE_DEVICE_TABLE(hid, cp2112_devices); 154 155 struct cp2112_device { 156 struct i2c_adapter adap; 157 struct hid_device *hdev; 158 wait_queue_head_t wait; 159 u8 read_data[61]; 160 u8 read_length; 161 u8 hwversion; 162 int xfer_status; 163 atomic_t read_avail; 164 atomic_t xfer_avail; 165 struct gpio_chip gc; 166 struct irq_chip irq; 167 u8 *in_out_buffer; 168 struct mutex lock; 169 170 struct gpio_desc *desc[8]; 171 bool gpio_poll; 172 struct delayed_work gpio_poll_worker; 173 unsigned long irq_mask; 174 u8 gpio_prev_state; 175 }; 176 177 static int gpio_push_pull = 0xFF; 178 module_param(gpio_push_pull, int, S_IRUGO | S_IWUSR); 179 MODULE_PARM_DESC(gpio_push_pull, "GPIO push-pull configuration bitmask"); 180 181 static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset) 182 { 183 struct cp2112_device *dev = gpiochip_get_data(chip); 184 struct hid_device *hdev = dev->hdev; 185 u8 *buf = dev->in_out_buffer; 186 int ret; 187 188 mutex_lock(&dev->lock); 189 190 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, 191 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, 192 HID_REQ_GET_REPORT); 193 if (ret != CP2112_GPIO_CONFIG_LENGTH) { 194 hid_err(hdev, "error requesting GPIO config: %d\n", ret); 195 if (ret >= 0) 196 ret = -EIO; 197 goto exit; 198 } 199 200 buf[1] &= ~(1 << offset); 201 buf[2] = gpio_push_pull; 202 203 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, 204 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, 205 HID_REQ_SET_REPORT); 206 if (ret != CP2112_GPIO_CONFIG_LENGTH) { 207 hid_err(hdev, "error setting GPIO config: %d\n", ret); 208 if (ret >= 0) 209 ret = -EIO; 210 goto exit; 211 } 212 213 ret = 0; 214 215 exit: 216 mutex_unlock(&dev->lock); 217 return ret; 218 } 219 220 static void cp2112_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 221 { 222 struct cp2112_device *dev = gpiochip_get_data(chip); 223 struct hid_device *hdev = dev->hdev; 224 u8 *buf = dev->in_out_buffer; 225 int ret; 226 227 mutex_lock(&dev->lock); 228 229 buf[0] = CP2112_GPIO_SET; 230 buf[1] = value ? 0xff : 0; 231 buf[2] = 1 << offset; 232 233 ret = hid_hw_raw_request(hdev, CP2112_GPIO_SET, buf, 234 CP2112_GPIO_SET_LENGTH, HID_FEATURE_REPORT, 235 HID_REQ_SET_REPORT); 236 if (ret < 0) 237 hid_err(hdev, "error setting GPIO values: %d\n", ret); 238 239 mutex_unlock(&dev->lock); 240 } 241 242 static int cp2112_gpio_get_all(struct gpio_chip *chip) 243 { 244 struct cp2112_device *dev = gpiochip_get_data(chip); 245 struct hid_device *hdev = dev->hdev; 246 u8 *buf = dev->in_out_buffer; 247 int ret; 248 249 mutex_lock(&dev->lock); 250 251 ret = hid_hw_raw_request(hdev, CP2112_GPIO_GET, buf, 252 CP2112_GPIO_GET_LENGTH, HID_FEATURE_REPORT, 253 HID_REQ_GET_REPORT); 254 if (ret != CP2112_GPIO_GET_LENGTH) { 255 hid_err(hdev, "error requesting GPIO values: %d\n", ret); 256 ret = ret < 0 ? ret : -EIO; 257 goto exit; 258 } 259 260 ret = buf[1]; 261 262 exit: 263 mutex_unlock(&dev->lock); 264 265 return ret; 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 mutex_lock(&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 goto fail; 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 goto fail; 306 } 307 308 mutex_unlock(&dev->lock); 309 310 /* 311 * Set gpio value when output direction is already set, 312 * as specified in AN495, Rev. 0.2, cpt. 4.4 313 */ 314 cp2112_gpio_set(chip, offset, value); 315 316 return 0; 317 318 fail: 319 mutex_unlock(&dev->lock); 320 return ret < 0 ? ret : -EIO; 321 } 322 323 static int cp2112_hid_get(struct hid_device *hdev, unsigned char report_number, 324 u8 *data, size_t count, unsigned char report_type) 325 { 326 u8 *buf; 327 int ret; 328 329 buf = kmalloc(count, GFP_KERNEL); 330 if (!buf) 331 return -ENOMEM; 332 333 ret = hid_hw_raw_request(hdev, report_number, buf, count, 334 report_type, HID_REQ_GET_REPORT); 335 memcpy(data, buf, count); 336 kfree(buf); 337 return ret; 338 } 339 340 static int cp2112_hid_output(struct hid_device *hdev, u8 *data, size_t count, 341 unsigned char report_type) 342 { 343 u8 *buf; 344 int ret; 345 346 buf = kmemdup(data, count, GFP_KERNEL); 347 if (!buf) 348 return -ENOMEM; 349 350 if (report_type == HID_OUTPUT_REPORT) 351 ret = hid_hw_output_report(hdev, buf, count); 352 else 353 ret = hid_hw_raw_request(hdev, buf[0], buf, count, report_type, 354 HID_REQ_SET_REPORT); 355 356 kfree(buf); 357 return ret; 358 } 359 360 static int cp2112_wait(struct cp2112_device *dev, atomic_t *avail) 361 { 362 int ret = 0; 363 364 /* We have sent either a CP2112_TRANSFER_STATUS_REQUEST or a 365 * CP2112_DATA_READ_FORCE_SEND and we are waiting for the response to 366 * come in cp2112_raw_event or timeout. There will only be one of these 367 * in flight at any one time. The timeout is extremely large and is a 368 * last resort if the CP2112 has died. If we do timeout we don't expect 369 * to receive the response which would cause data races, it's not like 370 * we can do anything about it anyway. 371 */ 372 ret = wait_event_interruptible_timeout(dev->wait, 373 atomic_read(avail), msecs_to_jiffies(RESPONSE_TIMEOUT)); 374 if (-ERESTARTSYS == ret) 375 return ret; 376 if (!ret) 377 return -ETIMEDOUT; 378 379 atomic_set(avail, 0); 380 return 0; 381 } 382 383 static int cp2112_xfer_status(struct cp2112_device *dev) 384 { 385 struct hid_device *hdev = dev->hdev; 386 u8 buf[2]; 387 int ret; 388 389 buf[0] = CP2112_TRANSFER_STATUS_REQUEST; 390 buf[1] = 0x01; 391 atomic_set(&dev->xfer_avail, 0); 392 393 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); 394 if (ret < 0) { 395 hid_warn(hdev, "Error requesting status: %d\n", ret); 396 return ret; 397 } 398 399 ret = cp2112_wait(dev, &dev->xfer_avail); 400 if (ret) 401 return ret; 402 403 return dev->xfer_status; 404 } 405 406 static int cp2112_read(struct cp2112_device *dev, u8 *data, size_t size) 407 { 408 struct hid_device *hdev = dev->hdev; 409 struct cp2112_force_read_report report; 410 int ret; 411 412 if (size > sizeof(dev->read_data)) 413 size = sizeof(dev->read_data); 414 report.report = CP2112_DATA_READ_FORCE_SEND; 415 report.length = cpu_to_be16(size); 416 417 atomic_set(&dev->read_avail, 0); 418 419 ret = cp2112_hid_output(hdev, &report.report, sizeof(report), 420 HID_OUTPUT_REPORT); 421 if (ret < 0) { 422 hid_warn(hdev, "Error requesting data: %d\n", ret); 423 return ret; 424 } 425 426 ret = cp2112_wait(dev, &dev->read_avail); 427 if (ret) 428 return ret; 429 430 hid_dbg(hdev, "read %d of %zd bytes requested\n", 431 dev->read_length, size); 432 433 if (size > dev->read_length) 434 size = dev->read_length; 435 436 memcpy(data, dev->read_data, size); 437 return dev->read_length; 438 } 439 440 static int cp2112_read_req(void *buf, u8 slave_address, u16 length) 441 { 442 struct cp2112_read_req_report *report = buf; 443 444 if (length < 1 || length > 512) 445 return -EINVAL; 446 447 report->report = CP2112_DATA_READ_REQUEST; 448 report->slave_address = slave_address << 1; 449 report->length = cpu_to_be16(length); 450 return sizeof(*report); 451 } 452 453 static int cp2112_write_read_req(void *buf, u8 slave_address, u16 length, 454 u8 command, u8 *data, u8 data_length) 455 { 456 struct cp2112_write_read_req_report *report = buf; 457 458 if (length < 1 || length > 512 459 || data_length > sizeof(report->target_address) - 1) 460 return -EINVAL; 461 462 report->report = CP2112_DATA_WRITE_READ_REQUEST; 463 report->slave_address = slave_address << 1; 464 report->length = cpu_to_be16(length); 465 report->target_address_length = data_length + 1; 466 report->target_address[0] = command; 467 memcpy(&report->target_address[1], data, data_length); 468 return data_length + 6; 469 } 470 471 static int cp2112_write_req(void *buf, u8 slave_address, u8 command, u8 *data, 472 u8 data_length) 473 { 474 struct cp2112_write_req_report *report = buf; 475 476 if (data_length > sizeof(report->data) - 1) 477 return -EINVAL; 478 479 report->report = CP2112_DATA_WRITE_REQUEST; 480 report->slave_address = slave_address << 1; 481 report->length = data_length + 1; 482 report->data[0] = command; 483 memcpy(&report->data[1], data, data_length); 484 return data_length + 4; 485 } 486 487 static int cp2112_i2c_write_req(void *buf, u8 slave_address, u8 *data, 488 u8 data_length) 489 { 490 struct cp2112_write_req_report *report = buf; 491 492 if (data_length > sizeof(report->data)) 493 return -EINVAL; 494 495 report->report = CP2112_DATA_WRITE_REQUEST; 496 report->slave_address = slave_address << 1; 497 report->length = data_length; 498 memcpy(report->data, data, data_length); 499 return data_length + 3; 500 } 501 502 static int cp2112_i2c_write_read_req(void *buf, u8 slave_address, 503 u8 *addr, int addr_length, 504 int read_length) 505 { 506 struct cp2112_write_read_req_report *report = buf; 507 508 if (read_length < 1 || read_length > 512 || 509 addr_length > sizeof(report->target_address)) 510 return -EINVAL; 511 512 report->report = CP2112_DATA_WRITE_READ_REQUEST; 513 report->slave_address = slave_address << 1; 514 report->length = cpu_to_be16(read_length); 515 report->target_address_length = addr_length; 516 memcpy(report->target_address, addr, addr_length); 517 return addr_length + 5; 518 } 519 520 static int cp2112_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, 521 int num) 522 { 523 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; 524 struct hid_device *hdev = dev->hdev; 525 u8 buf[64]; 526 ssize_t count; 527 ssize_t read_length = 0; 528 u8 *read_buf = NULL; 529 unsigned int retries; 530 int ret; 531 532 hid_dbg(hdev, "I2C %d messages\n", num); 533 534 if (num == 1) { 535 if (msgs->flags & I2C_M_RD) { 536 hid_dbg(hdev, "I2C read %#04x len %d\n", 537 msgs->addr, msgs->len); 538 read_length = msgs->len; 539 read_buf = msgs->buf; 540 count = cp2112_read_req(buf, msgs->addr, msgs->len); 541 } else { 542 hid_dbg(hdev, "I2C write %#04x len %d\n", 543 msgs->addr, msgs->len); 544 count = cp2112_i2c_write_req(buf, msgs->addr, 545 msgs->buf, msgs->len); 546 } 547 if (count < 0) 548 return count; 549 } else if (dev->hwversion > 1 && /* no repeated start in rev 1 */ 550 num == 2 && 551 msgs[0].addr == msgs[1].addr && 552 !(msgs[0].flags & I2C_M_RD) && (msgs[1].flags & I2C_M_RD)) { 553 hid_dbg(hdev, "I2C write-read %#04x wlen %d rlen %d\n", 554 msgs[0].addr, msgs[0].len, msgs[1].len); 555 read_length = msgs[1].len; 556 read_buf = msgs[1].buf; 557 count = cp2112_i2c_write_read_req(buf, msgs[0].addr, 558 msgs[0].buf, msgs[0].len, msgs[1].len); 559 if (count < 0) 560 return count; 561 } else { 562 hid_err(hdev, 563 "Multi-message I2C transactions not supported\n"); 564 return -EOPNOTSUPP; 565 } 566 567 ret = hid_hw_power(hdev, PM_HINT_FULLON); 568 if (ret < 0) { 569 hid_err(hdev, "power management error: %d\n", ret); 570 return ret; 571 } 572 573 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); 574 if (ret < 0) { 575 hid_warn(hdev, "Error starting transaction: %d\n", ret); 576 goto power_normal; 577 } 578 579 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { 580 ret = cp2112_xfer_status(dev); 581 if (-EBUSY == ret) 582 continue; 583 if (ret < 0) 584 goto power_normal; 585 break; 586 } 587 588 if (XFER_STATUS_RETRIES <= retries) { 589 hid_warn(hdev, "Transfer timed out, cancelling.\n"); 590 buf[0] = CP2112_CANCEL_TRANSFER; 591 buf[1] = 0x01; 592 593 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); 594 if (ret < 0) 595 hid_warn(hdev, "Error cancelling transaction: %d\n", 596 ret); 597 598 ret = -ETIMEDOUT; 599 goto power_normal; 600 } 601 602 for (count = 0; count < read_length;) { 603 ret = cp2112_read(dev, read_buf + count, read_length - count); 604 if (ret < 0) 605 goto power_normal; 606 if (ret == 0) { 607 hid_err(hdev, "read returned 0\n"); 608 ret = -EIO; 609 goto power_normal; 610 } 611 count += ret; 612 if (count > read_length) { 613 /* 614 * The hardware returned too much data. 615 * This is mostly harmless because cp2112_read() 616 * has a limit check so didn't overrun our 617 * buffer. Nevertheless, we return an error 618 * because something is seriously wrong and 619 * it shouldn't go unnoticed. 620 */ 621 hid_err(hdev, "long read: %d > %zd\n", 622 ret, read_length - count + ret); 623 ret = -EIO; 624 goto power_normal; 625 } 626 } 627 628 /* return the number of transferred messages */ 629 ret = num; 630 631 power_normal: 632 hid_hw_power(hdev, PM_HINT_NORMAL); 633 hid_dbg(hdev, "I2C transfer finished: %d\n", ret); 634 return ret; 635 } 636 637 static int cp2112_xfer(struct i2c_adapter *adap, u16 addr, 638 unsigned short flags, char read_write, u8 command, 639 int size, union i2c_smbus_data *data) 640 { 641 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; 642 struct hid_device *hdev = dev->hdev; 643 u8 buf[64]; 644 __le16 word; 645 ssize_t count; 646 size_t read_length = 0; 647 unsigned int retries; 648 int ret; 649 650 hid_dbg(hdev, "%s addr 0x%x flags 0x%x cmd 0x%x size %d\n", 651 read_write == I2C_SMBUS_WRITE ? "write" : "read", 652 addr, flags, command, size); 653 654 switch (size) { 655 case I2C_SMBUS_BYTE: 656 read_length = 1; 657 658 if (I2C_SMBUS_READ == read_write) 659 count = cp2112_read_req(buf, addr, read_length); 660 else 661 count = cp2112_write_req(buf, addr, command, NULL, 662 0); 663 break; 664 case I2C_SMBUS_BYTE_DATA: 665 read_length = 1; 666 667 if (I2C_SMBUS_READ == read_write) 668 count = cp2112_write_read_req(buf, addr, read_length, 669 command, NULL, 0); 670 else 671 count = cp2112_write_req(buf, addr, command, 672 &data->byte, 1); 673 break; 674 case I2C_SMBUS_WORD_DATA: 675 read_length = 2; 676 word = cpu_to_le16(data->word); 677 678 if (I2C_SMBUS_READ == read_write) 679 count = cp2112_write_read_req(buf, addr, read_length, 680 command, NULL, 0); 681 else 682 count = cp2112_write_req(buf, addr, command, 683 (u8 *)&word, 2); 684 break; 685 case I2C_SMBUS_PROC_CALL: 686 size = I2C_SMBUS_WORD_DATA; 687 read_write = I2C_SMBUS_READ; 688 read_length = 2; 689 word = cpu_to_le16(data->word); 690 691 count = cp2112_write_read_req(buf, addr, read_length, command, 692 (u8 *)&word, 2); 693 break; 694 case I2C_SMBUS_I2C_BLOCK_DATA: 695 if (read_write == I2C_SMBUS_READ) { 696 read_length = data->block[0]; 697 count = cp2112_write_read_req(buf, addr, read_length, 698 command, NULL, 0); 699 } else { 700 count = cp2112_write_req(buf, addr, command, 701 data->block + 1, 702 data->block[0]); 703 } 704 break; 705 case I2C_SMBUS_BLOCK_DATA: 706 if (I2C_SMBUS_READ == read_write) { 707 count = cp2112_write_read_req(buf, addr, 708 I2C_SMBUS_BLOCK_MAX, 709 command, NULL, 0); 710 } else { 711 count = cp2112_write_req(buf, addr, command, 712 data->block, 713 data->block[0] + 1); 714 } 715 break; 716 case I2C_SMBUS_BLOCK_PROC_CALL: 717 size = I2C_SMBUS_BLOCK_DATA; 718 read_write = I2C_SMBUS_READ; 719 720 count = cp2112_write_read_req(buf, addr, I2C_SMBUS_BLOCK_MAX, 721 command, data->block, 722 data->block[0] + 1); 723 break; 724 default: 725 hid_warn(hdev, "Unsupported transaction %d\n", size); 726 return -EOPNOTSUPP; 727 } 728 729 if (count < 0) 730 return count; 731 732 ret = hid_hw_power(hdev, PM_HINT_FULLON); 733 if (ret < 0) { 734 hid_err(hdev, "power management error: %d\n", ret); 735 return ret; 736 } 737 738 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); 739 if (ret < 0) { 740 hid_warn(hdev, "Error starting transaction: %d\n", ret); 741 goto power_normal; 742 } 743 744 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { 745 ret = cp2112_xfer_status(dev); 746 if (-EBUSY == ret) 747 continue; 748 if (ret < 0) 749 goto power_normal; 750 break; 751 } 752 753 if (XFER_STATUS_RETRIES <= retries) { 754 hid_warn(hdev, "Transfer timed out, cancelling.\n"); 755 buf[0] = CP2112_CANCEL_TRANSFER; 756 buf[1] = 0x01; 757 758 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); 759 if (ret < 0) 760 hid_warn(hdev, "Error cancelling transaction: %d\n", 761 ret); 762 763 ret = -ETIMEDOUT; 764 goto power_normal; 765 } 766 767 if (I2C_SMBUS_WRITE == read_write) { 768 ret = 0; 769 goto power_normal; 770 } 771 772 if (I2C_SMBUS_BLOCK_DATA == size) 773 read_length = ret; 774 775 ret = cp2112_read(dev, buf, read_length); 776 if (ret < 0) 777 goto power_normal; 778 if (ret != read_length) { 779 hid_warn(hdev, "short read: %d < %zd\n", ret, read_length); 780 ret = -EIO; 781 goto power_normal; 782 } 783 784 switch (size) { 785 case I2C_SMBUS_BYTE: 786 case I2C_SMBUS_BYTE_DATA: 787 data->byte = buf[0]; 788 break; 789 case I2C_SMBUS_WORD_DATA: 790 data->word = le16_to_cpup((__le16 *)buf); 791 break; 792 case I2C_SMBUS_I2C_BLOCK_DATA: 793 memcpy(data->block + 1, buf, read_length); 794 break; 795 case I2C_SMBUS_BLOCK_DATA: 796 if (read_length > I2C_SMBUS_BLOCK_MAX) { 797 ret = -EPROTO; 798 goto power_normal; 799 } 800 801 memcpy(data->block, buf, read_length); 802 break; 803 } 804 805 ret = 0; 806 power_normal: 807 hid_hw_power(hdev, PM_HINT_NORMAL); 808 hid_dbg(hdev, "transfer finished: %d\n", ret); 809 return ret; 810 } 811 812 static u32 cp2112_functionality(struct i2c_adapter *adap) 813 { 814 return I2C_FUNC_I2C | 815 I2C_FUNC_SMBUS_BYTE | 816 I2C_FUNC_SMBUS_BYTE_DATA | 817 I2C_FUNC_SMBUS_WORD_DATA | 818 I2C_FUNC_SMBUS_BLOCK_DATA | 819 I2C_FUNC_SMBUS_I2C_BLOCK | 820 I2C_FUNC_SMBUS_PROC_CALL | 821 I2C_FUNC_SMBUS_BLOCK_PROC_CALL; 822 } 823 824 static const struct i2c_algorithm smbus_algorithm = { 825 .master_xfer = cp2112_i2c_xfer, 826 .smbus_xfer = cp2112_xfer, 827 .functionality = cp2112_functionality, 828 }; 829 830 static int cp2112_get_usb_config(struct hid_device *hdev, 831 struct cp2112_usb_config_report *cfg) 832 { 833 int ret; 834 835 ret = cp2112_hid_get(hdev, CP2112_USB_CONFIG, (u8 *)cfg, sizeof(*cfg), 836 HID_FEATURE_REPORT); 837 if (ret != sizeof(*cfg)) { 838 hid_err(hdev, "error reading usb config: %d\n", ret); 839 if (ret < 0) 840 return ret; 841 return -EIO; 842 } 843 844 return 0; 845 } 846 847 static int cp2112_set_usb_config(struct hid_device *hdev, 848 struct cp2112_usb_config_report *cfg) 849 { 850 int ret; 851 852 BUG_ON(cfg->report != CP2112_USB_CONFIG); 853 854 ret = cp2112_hid_output(hdev, (u8 *)cfg, sizeof(*cfg), 855 HID_FEATURE_REPORT); 856 if (ret != sizeof(*cfg)) { 857 hid_err(hdev, "error writing usb config: %d\n", ret); 858 if (ret < 0) 859 return ret; 860 return -EIO; 861 } 862 863 return 0; 864 } 865 866 static void chmod_sysfs_attrs(struct hid_device *hdev); 867 868 #define CP2112_CONFIG_ATTR(name, store, format, ...) \ 869 static ssize_t name##_store(struct device *kdev, \ 870 struct device_attribute *attr, const char *buf, \ 871 size_t count) \ 872 { \ 873 struct hid_device *hdev = to_hid_device(kdev); \ 874 struct cp2112_usb_config_report cfg; \ 875 int ret = cp2112_get_usb_config(hdev, &cfg); \ 876 if (ret) \ 877 return ret; \ 878 store; \ 879 ret = cp2112_set_usb_config(hdev, &cfg); \ 880 if (ret) \ 881 return ret; \ 882 chmod_sysfs_attrs(hdev); \ 883 return count; \ 884 } \ 885 static ssize_t name##_show(struct device *kdev, \ 886 struct device_attribute *attr, char *buf) \ 887 { \ 888 struct hid_device *hdev = to_hid_device(kdev); \ 889 struct cp2112_usb_config_report cfg; \ 890 int ret = cp2112_get_usb_config(hdev, &cfg); \ 891 if (ret) \ 892 return ret; \ 893 return scnprintf(buf, PAGE_SIZE, format, ##__VA_ARGS__); \ 894 } \ 895 static DEVICE_ATTR_RW(name); 896 897 CP2112_CONFIG_ATTR(vendor_id, ({ 898 u16 vid; 899 900 if (sscanf(buf, "%hi", &vid) != 1) 901 return -EINVAL; 902 903 cfg.vid = cpu_to_le16(vid); 904 cfg.mask = 0x01; 905 }), "0x%04x\n", le16_to_cpu(cfg.vid)); 906 907 CP2112_CONFIG_ATTR(product_id, ({ 908 u16 pid; 909 910 if (sscanf(buf, "%hi", &pid) != 1) 911 return -EINVAL; 912 913 cfg.pid = cpu_to_le16(pid); 914 cfg.mask = 0x02; 915 }), "0x%04x\n", le16_to_cpu(cfg.pid)); 916 917 CP2112_CONFIG_ATTR(max_power, ({ 918 int mA; 919 920 if (sscanf(buf, "%i", &mA) != 1) 921 return -EINVAL; 922 923 cfg.max_power = (mA + 1) / 2; 924 cfg.mask = 0x04; 925 }), "%u mA\n", cfg.max_power * 2); 926 927 CP2112_CONFIG_ATTR(power_mode, ({ 928 if (sscanf(buf, "%hhi", &cfg.power_mode) != 1) 929 return -EINVAL; 930 931 cfg.mask = 0x08; 932 }), "%u\n", cfg.power_mode); 933 934 CP2112_CONFIG_ATTR(release_version, ({ 935 if (sscanf(buf, "%hhi.%hhi", &cfg.release_major, &cfg.release_minor) 936 != 2) 937 return -EINVAL; 938 939 cfg.mask = 0x10; 940 }), "%u.%u\n", cfg.release_major, cfg.release_minor); 941 942 #undef CP2112_CONFIG_ATTR 943 944 struct cp2112_pstring_attribute { 945 struct device_attribute attr; 946 unsigned char report; 947 }; 948 949 static ssize_t pstr_store(struct device *kdev, 950 struct device_attribute *kattr, const char *buf, 951 size_t count) 952 { 953 struct hid_device *hdev = to_hid_device(kdev); 954 struct cp2112_pstring_attribute *attr = 955 container_of(kattr, struct cp2112_pstring_attribute, attr); 956 struct cp2112_string_report report; 957 int ret; 958 959 memset(&report, 0, sizeof(report)); 960 961 ret = utf8s_to_utf16s(buf, count, UTF16_LITTLE_ENDIAN, 962 report.string, ARRAY_SIZE(report.string)); 963 report.report = attr->report; 964 report.length = ret * sizeof(report.string[0]) + 2; 965 report.type = USB_DT_STRING; 966 967 ret = cp2112_hid_output(hdev, &report.report, report.length + 1, 968 HID_FEATURE_REPORT); 969 if (ret != report.length + 1) { 970 hid_err(hdev, "error writing %s string: %d\n", kattr->attr.name, 971 ret); 972 if (ret < 0) 973 return ret; 974 return -EIO; 975 } 976 977 chmod_sysfs_attrs(hdev); 978 return count; 979 } 980 981 static ssize_t pstr_show(struct device *kdev, 982 struct device_attribute *kattr, char *buf) 983 { 984 struct hid_device *hdev = to_hid_device(kdev); 985 struct cp2112_pstring_attribute *attr = 986 container_of(kattr, struct cp2112_pstring_attribute, attr); 987 struct cp2112_string_report report; 988 u8 length; 989 int ret; 990 991 ret = cp2112_hid_get(hdev, attr->report, (u8 *)&report.contents, 992 sizeof(report.contents), HID_FEATURE_REPORT); 993 if (ret < 3) { 994 hid_err(hdev, "error reading %s string: %d\n", kattr->attr.name, 995 ret); 996 if (ret < 0) 997 return ret; 998 return -EIO; 999 } 1000 1001 if (report.length < 2) { 1002 hid_err(hdev, "invalid %s string length: %d\n", 1003 kattr->attr.name, report.length); 1004 return -EIO; 1005 } 1006 1007 length = report.length > ret - 1 ? ret - 1 : report.length; 1008 length = (length - 2) / sizeof(report.string[0]); 1009 ret = utf16s_to_utf8s(report.string, length, UTF16_LITTLE_ENDIAN, buf, 1010 PAGE_SIZE - 1); 1011 buf[ret++] = '\n'; 1012 return ret; 1013 } 1014 1015 #define CP2112_PSTR_ATTR(name, _report) \ 1016 static struct cp2112_pstring_attribute dev_attr_##name = { \ 1017 .attr = __ATTR(name, (S_IWUSR | S_IRUGO), pstr_show, pstr_store), \ 1018 .report = _report, \ 1019 }; 1020 1021 CP2112_PSTR_ATTR(manufacturer, CP2112_MANUFACTURER_STRING); 1022 CP2112_PSTR_ATTR(product, CP2112_PRODUCT_STRING); 1023 CP2112_PSTR_ATTR(serial, CP2112_SERIAL_STRING); 1024 1025 #undef CP2112_PSTR_ATTR 1026 1027 static const struct attribute_group cp2112_attr_group = { 1028 .attrs = (struct attribute *[]){ 1029 &dev_attr_vendor_id.attr, 1030 &dev_attr_product_id.attr, 1031 &dev_attr_max_power.attr, 1032 &dev_attr_power_mode.attr, 1033 &dev_attr_release_version.attr, 1034 &dev_attr_manufacturer.attr.attr, 1035 &dev_attr_product.attr.attr, 1036 &dev_attr_serial.attr.attr, 1037 NULL 1038 } 1039 }; 1040 1041 /* Chmoding our sysfs attributes is simply a way to expose which fields in the 1042 * PROM have already been programmed. We do not depend on this preventing 1043 * writing to these attributes since the CP2112 will simply ignore writes to 1044 * already-programmed fields. This is why there is no sense in fixing this 1045 * racy behaviour. 1046 */ 1047 static void chmod_sysfs_attrs(struct hid_device *hdev) 1048 { 1049 struct attribute **attr; 1050 u8 buf[2]; 1051 int ret; 1052 1053 ret = cp2112_hid_get(hdev, CP2112_LOCK_BYTE, buf, sizeof(buf), 1054 HID_FEATURE_REPORT); 1055 if (ret != sizeof(buf)) { 1056 hid_err(hdev, "error reading lock byte: %d\n", ret); 1057 return; 1058 } 1059 1060 for (attr = cp2112_attr_group.attrs; *attr; ++attr) { 1061 umode_t mode = (buf[1] & 1) ? S_IWUSR | S_IRUGO : S_IRUGO; 1062 ret = sysfs_chmod_file(&hdev->dev.kobj, *attr, mode); 1063 if (ret < 0) 1064 hid_err(hdev, "error chmoding sysfs file %s\n", 1065 (*attr)->name); 1066 buf[1] >>= 1; 1067 } 1068 } 1069 1070 static void cp2112_gpio_irq_ack(struct irq_data *d) 1071 { 1072 } 1073 1074 static void cp2112_gpio_irq_mask(struct irq_data *d) 1075 { 1076 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1077 struct cp2112_device *dev = gpiochip_get_data(gc); 1078 1079 __clear_bit(d->hwirq, &dev->irq_mask); 1080 } 1081 1082 static void cp2112_gpio_irq_unmask(struct irq_data *d) 1083 { 1084 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1085 struct cp2112_device *dev = gpiochip_get_data(gc); 1086 1087 __set_bit(d->hwirq, &dev->irq_mask); 1088 } 1089 1090 static void cp2112_gpio_poll_callback(struct work_struct *work) 1091 { 1092 struct cp2112_device *dev = container_of(work, struct cp2112_device, 1093 gpio_poll_worker.work); 1094 struct irq_data *d; 1095 u8 gpio_mask; 1096 u8 virqs = (u8)dev->irq_mask; 1097 u32 irq_type; 1098 int irq, virq, ret; 1099 1100 ret = cp2112_gpio_get_all(&dev->gc); 1101 if (ret == -ENODEV) /* the hardware has been disconnected */ 1102 return; 1103 if (ret < 0) 1104 goto exit; 1105 1106 gpio_mask = ret; 1107 1108 while (virqs) { 1109 virq = ffs(virqs) - 1; 1110 virqs &= ~BIT(virq); 1111 1112 if (!dev->gc.to_irq) 1113 break; 1114 1115 irq = dev->gc.to_irq(&dev->gc, virq); 1116 1117 d = irq_get_irq_data(irq); 1118 if (!d) 1119 continue; 1120 1121 irq_type = irqd_get_trigger_type(d); 1122 1123 if (gpio_mask & BIT(virq)) { 1124 /* Level High */ 1125 1126 if (irq_type & IRQ_TYPE_LEVEL_HIGH) 1127 handle_nested_irq(irq); 1128 1129 if ((irq_type & IRQ_TYPE_EDGE_RISING) && 1130 !(dev->gpio_prev_state & BIT(virq))) 1131 handle_nested_irq(irq); 1132 } else { 1133 /* Level Low */ 1134 1135 if (irq_type & IRQ_TYPE_LEVEL_LOW) 1136 handle_nested_irq(irq); 1137 1138 if ((irq_type & IRQ_TYPE_EDGE_FALLING) && 1139 (dev->gpio_prev_state & BIT(virq))) 1140 handle_nested_irq(irq); 1141 } 1142 } 1143 1144 dev->gpio_prev_state = gpio_mask; 1145 1146 exit: 1147 if (dev->gpio_poll) 1148 schedule_delayed_work(&dev->gpio_poll_worker, 10); 1149 } 1150 1151 1152 static unsigned int cp2112_gpio_irq_startup(struct irq_data *d) 1153 { 1154 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1155 struct cp2112_device *dev = gpiochip_get_data(gc); 1156 1157 INIT_DELAYED_WORK(&dev->gpio_poll_worker, cp2112_gpio_poll_callback); 1158 1159 if (!dev->gpio_poll) { 1160 dev->gpio_poll = true; 1161 schedule_delayed_work(&dev->gpio_poll_worker, 0); 1162 } 1163 1164 cp2112_gpio_irq_unmask(d); 1165 return 0; 1166 } 1167 1168 static void cp2112_gpio_irq_shutdown(struct irq_data *d) 1169 { 1170 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1171 struct cp2112_device *dev = gpiochip_get_data(gc); 1172 1173 cancel_delayed_work_sync(&dev->gpio_poll_worker); 1174 } 1175 1176 static int cp2112_gpio_irq_type(struct irq_data *d, unsigned int type) 1177 { 1178 return 0; 1179 } 1180 1181 static int __maybe_unused cp2112_allocate_irq(struct cp2112_device *dev, 1182 int pin) 1183 { 1184 int ret; 1185 1186 if (dev->desc[pin]) 1187 return -EINVAL; 1188 1189 dev->desc[pin] = gpiochip_request_own_desc(&dev->gc, pin, 1190 "HID/I2C:Event", 1191 GPIO_ACTIVE_HIGH, 1192 GPIOD_IN); 1193 if (IS_ERR(dev->desc[pin])) { 1194 dev_err(dev->gc.parent, "Failed to request GPIO\n"); 1195 return PTR_ERR(dev->desc[pin]); 1196 } 1197 1198 ret = cp2112_gpio_direction_input(&dev->gc, pin); 1199 if (ret < 0) { 1200 dev_err(dev->gc.parent, "Failed to set GPIO to input dir\n"); 1201 goto err_desc; 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 struct gpio_irq_chip *girq; 1232 int ret; 1233 1234 dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL); 1235 if (!dev) 1236 return -ENOMEM; 1237 1238 dev->in_out_buffer = devm_kzalloc(&hdev->dev, CP2112_REPORT_MAX_LENGTH, 1239 GFP_KERNEL); 1240 if (!dev->in_out_buffer) 1241 return -ENOMEM; 1242 1243 mutex_init(&dev->lock); 1244 1245 ret = hid_parse(hdev); 1246 if (ret) { 1247 hid_err(hdev, "parse failed\n"); 1248 return ret; 1249 } 1250 1251 ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW); 1252 if (ret) { 1253 hid_err(hdev, "hw start failed\n"); 1254 return ret; 1255 } 1256 1257 ret = hid_hw_open(hdev); 1258 if (ret) { 1259 hid_err(hdev, "hw open failed\n"); 1260 goto err_hid_stop; 1261 } 1262 1263 ret = hid_hw_power(hdev, PM_HINT_FULLON); 1264 if (ret < 0) { 1265 hid_err(hdev, "power management error: %d\n", ret); 1266 goto err_hid_close; 1267 } 1268 1269 ret = cp2112_hid_get(hdev, CP2112_GET_VERSION_INFO, buf, sizeof(buf), 1270 HID_FEATURE_REPORT); 1271 if (ret != sizeof(buf)) { 1272 hid_err(hdev, "error requesting version\n"); 1273 if (ret >= 0) 1274 ret = -EIO; 1275 goto err_power_normal; 1276 } 1277 1278 hid_info(hdev, "Part Number: 0x%02X Device Version: 0x%02X\n", 1279 buf[1], buf[2]); 1280 1281 ret = cp2112_hid_get(hdev, CP2112_SMBUS_CONFIG, (u8 *)&config, 1282 sizeof(config), HID_FEATURE_REPORT); 1283 if (ret != sizeof(config)) { 1284 hid_err(hdev, "error requesting SMBus config\n"); 1285 if (ret >= 0) 1286 ret = -EIO; 1287 goto err_power_normal; 1288 } 1289 1290 config.retry_time = cpu_to_be16(1); 1291 1292 ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config), 1293 HID_FEATURE_REPORT); 1294 if (ret != sizeof(config)) { 1295 hid_err(hdev, "error setting SMBus config\n"); 1296 if (ret >= 0) 1297 ret = -EIO; 1298 goto err_power_normal; 1299 } 1300 1301 hid_set_drvdata(hdev, (void *)dev); 1302 dev->hdev = hdev; 1303 dev->adap.owner = THIS_MODULE; 1304 dev->adap.class = I2C_CLASS_HWMON; 1305 dev->adap.algo = &smbus_algorithm; 1306 dev->adap.algo_data = dev; 1307 dev->adap.dev.parent = &hdev->dev; 1308 snprintf(dev->adap.name, sizeof(dev->adap.name), 1309 "CP2112 SMBus Bridge on hidraw%d", 1310 ((struct hidraw *)hdev->hidraw)->minor); 1311 dev->hwversion = buf[2]; 1312 init_waitqueue_head(&dev->wait); 1313 1314 hid_device_io_start(hdev); 1315 ret = i2c_add_adapter(&dev->adap); 1316 hid_device_io_stop(hdev); 1317 1318 if (ret) { 1319 hid_err(hdev, "error registering i2c adapter\n"); 1320 goto err_power_normal; 1321 } 1322 1323 hid_dbg(hdev, "adapter registered\n"); 1324 1325 dev->gc.label = "cp2112_gpio"; 1326 dev->gc.direction_input = cp2112_gpio_direction_input; 1327 dev->gc.direction_output = cp2112_gpio_direction_output; 1328 dev->gc.set = cp2112_gpio_set; 1329 dev->gc.get = cp2112_gpio_get; 1330 dev->gc.base = -1; 1331 dev->gc.ngpio = 8; 1332 dev->gc.can_sleep = 1; 1333 dev->gc.parent = &hdev->dev; 1334 1335 dev->irq.name = "cp2112-gpio"; 1336 dev->irq.irq_startup = cp2112_gpio_irq_startup; 1337 dev->irq.irq_shutdown = cp2112_gpio_irq_shutdown; 1338 dev->irq.irq_ack = cp2112_gpio_irq_ack; 1339 dev->irq.irq_mask = cp2112_gpio_irq_mask; 1340 dev->irq.irq_unmask = cp2112_gpio_irq_unmask; 1341 dev->irq.irq_set_type = cp2112_gpio_irq_type; 1342 dev->irq.flags = IRQCHIP_MASK_ON_SUSPEND; 1343 1344 girq = &dev->gc.irq; 1345 girq->chip = &dev->irq; 1346 /* The event comes from the outside so no parent handler */ 1347 girq->parent_handler = NULL; 1348 girq->num_parents = 0; 1349 girq->parents = NULL; 1350 girq->default_type = IRQ_TYPE_NONE; 1351 girq->handler = handle_simple_irq; 1352 1353 ret = gpiochip_add_data(&dev->gc, dev); 1354 if (ret < 0) { 1355 hid_err(hdev, "error registering gpio chip\n"); 1356 goto err_free_i2c; 1357 } 1358 1359 ret = sysfs_create_group(&hdev->dev.kobj, &cp2112_attr_group); 1360 if (ret < 0) { 1361 hid_err(hdev, "error creating sysfs attrs\n"); 1362 goto err_gpiochip_remove; 1363 } 1364 1365 chmod_sysfs_attrs(hdev); 1366 hid_hw_power(hdev, PM_HINT_NORMAL); 1367 1368 return ret; 1369 1370 err_gpiochip_remove: 1371 gpiochip_remove(&dev->gc); 1372 err_free_i2c: 1373 i2c_del_adapter(&dev->adap); 1374 err_power_normal: 1375 hid_hw_power(hdev, PM_HINT_NORMAL); 1376 err_hid_close: 1377 hid_hw_close(hdev); 1378 err_hid_stop: 1379 hid_hw_stop(hdev); 1380 return ret; 1381 } 1382 1383 static void cp2112_remove(struct hid_device *hdev) 1384 { 1385 struct cp2112_device *dev = hid_get_drvdata(hdev); 1386 int i; 1387 1388 sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group); 1389 i2c_del_adapter(&dev->adap); 1390 1391 if (dev->gpio_poll) { 1392 dev->gpio_poll = false; 1393 cancel_delayed_work_sync(&dev->gpio_poll_worker); 1394 } 1395 1396 for (i = 0; i < ARRAY_SIZE(dev->desc); i++) { 1397 gpiochip_unlock_as_irq(&dev->gc, i); 1398 gpiochip_free_own_desc(dev->desc[i]); 1399 } 1400 1401 gpiochip_remove(&dev->gc); 1402 /* i2c_del_adapter has finished removing all i2c devices from our 1403 * adapter. Well behaved devices should no longer call our cp2112_xfer 1404 * and should have waited for any pending calls to finish. It has also 1405 * waited for device_unregister(&adap->dev) to complete. Therefore we 1406 * can safely free our struct cp2112_device. 1407 */ 1408 hid_hw_close(hdev); 1409 hid_hw_stop(hdev); 1410 } 1411 1412 static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report, 1413 u8 *data, int size) 1414 { 1415 struct cp2112_device *dev = hid_get_drvdata(hdev); 1416 struct cp2112_xfer_status_report *xfer = (void *)data; 1417 1418 switch (data[0]) { 1419 case CP2112_TRANSFER_STATUS_RESPONSE: 1420 hid_dbg(hdev, "xfer status: %02x %02x %04x %04x\n", 1421 xfer->status0, xfer->status1, 1422 be16_to_cpu(xfer->retries), be16_to_cpu(xfer->length)); 1423 1424 switch (xfer->status0) { 1425 case STATUS0_IDLE: 1426 dev->xfer_status = -EAGAIN; 1427 break; 1428 case STATUS0_BUSY: 1429 dev->xfer_status = -EBUSY; 1430 break; 1431 case STATUS0_COMPLETE: 1432 dev->xfer_status = be16_to_cpu(xfer->length); 1433 break; 1434 case STATUS0_ERROR: 1435 switch (xfer->status1) { 1436 case STATUS1_TIMEOUT_NACK: 1437 case STATUS1_TIMEOUT_BUS: 1438 dev->xfer_status = -ETIMEDOUT; 1439 break; 1440 default: 1441 dev->xfer_status = -EIO; 1442 break; 1443 } 1444 break; 1445 default: 1446 dev->xfer_status = -EINVAL; 1447 break; 1448 } 1449 1450 atomic_set(&dev->xfer_avail, 1); 1451 break; 1452 case CP2112_DATA_READ_RESPONSE: 1453 hid_dbg(hdev, "read response: %02x %02x\n", data[1], data[2]); 1454 1455 dev->read_length = data[2]; 1456 if (dev->read_length > sizeof(dev->read_data)) 1457 dev->read_length = sizeof(dev->read_data); 1458 1459 memcpy(dev->read_data, &data[3], dev->read_length); 1460 atomic_set(&dev->read_avail, 1); 1461 break; 1462 default: 1463 hid_err(hdev, "unknown report\n"); 1464 1465 return 0; 1466 } 1467 1468 wake_up_interruptible(&dev->wait); 1469 return 1; 1470 } 1471 1472 static struct hid_driver cp2112_driver = { 1473 .name = "cp2112", 1474 .id_table = cp2112_devices, 1475 .probe = cp2112_probe, 1476 .remove = cp2112_remove, 1477 .raw_event = cp2112_raw_event, 1478 }; 1479 1480 module_hid_driver(cp2112_driver); 1481 MODULE_DESCRIPTION("Silicon Labs HID USB to SMBus master bridge"); 1482 MODULE_AUTHOR("David Barksdale <dbarksdale@uplogix.com>"); 1483 MODULE_LICENSE("GPL"); 1484 1485