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 if (read_length > I2C_SMBUS_BLOCK_MAX) { 794 ret = -EINVAL; 795 goto power_normal; 796 } 797 798 memcpy(data->block + 1, buf, read_length); 799 break; 800 case I2C_SMBUS_BLOCK_DATA: 801 if (read_length > I2C_SMBUS_BLOCK_MAX) { 802 ret = -EPROTO; 803 goto power_normal; 804 } 805 806 memcpy(data->block, buf, read_length); 807 break; 808 } 809 810 ret = 0; 811 power_normal: 812 hid_hw_power(hdev, PM_HINT_NORMAL); 813 hid_dbg(hdev, "transfer finished: %d\n", ret); 814 return ret; 815 } 816 817 static u32 cp2112_functionality(struct i2c_adapter *adap) 818 { 819 return I2C_FUNC_I2C | 820 I2C_FUNC_SMBUS_BYTE | 821 I2C_FUNC_SMBUS_BYTE_DATA | 822 I2C_FUNC_SMBUS_WORD_DATA | 823 I2C_FUNC_SMBUS_BLOCK_DATA | 824 I2C_FUNC_SMBUS_I2C_BLOCK | 825 I2C_FUNC_SMBUS_PROC_CALL | 826 I2C_FUNC_SMBUS_BLOCK_PROC_CALL; 827 } 828 829 static const struct i2c_algorithm smbus_algorithm = { 830 .master_xfer = cp2112_i2c_xfer, 831 .smbus_xfer = cp2112_xfer, 832 .functionality = cp2112_functionality, 833 }; 834 835 static int cp2112_get_usb_config(struct hid_device *hdev, 836 struct cp2112_usb_config_report *cfg) 837 { 838 int ret; 839 840 ret = cp2112_hid_get(hdev, CP2112_USB_CONFIG, (u8 *)cfg, sizeof(*cfg), 841 HID_FEATURE_REPORT); 842 if (ret != sizeof(*cfg)) { 843 hid_err(hdev, "error reading usb config: %d\n", ret); 844 if (ret < 0) 845 return ret; 846 return -EIO; 847 } 848 849 return 0; 850 } 851 852 static int cp2112_set_usb_config(struct hid_device *hdev, 853 struct cp2112_usb_config_report *cfg) 854 { 855 int ret; 856 857 BUG_ON(cfg->report != CP2112_USB_CONFIG); 858 859 ret = cp2112_hid_output(hdev, (u8 *)cfg, sizeof(*cfg), 860 HID_FEATURE_REPORT); 861 if (ret != sizeof(*cfg)) { 862 hid_err(hdev, "error writing usb config: %d\n", ret); 863 if (ret < 0) 864 return ret; 865 return -EIO; 866 } 867 868 return 0; 869 } 870 871 static void chmod_sysfs_attrs(struct hid_device *hdev); 872 873 #define CP2112_CONFIG_ATTR(name, store, format, ...) \ 874 static ssize_t name##_store(struct device *kdev, \ 875 struct device_attribute *attr, const char *buf, \ 876 size_t count) \ 877 { \ 878 struct hid_device *hdev = to_hid_device(kdev); \ 879 struct cp2112_usb_config_report cfg; \ 880 int ret = cp2112_get_usb_config(hdev, &cfg); \ 881 if (ret) \ 882 return ret; \ 883 store; \ 884 ret = cp2112_set_usb_config(hdev, &cfg); \ 885 if (ret) \ 886 return ret; \ 887 chmod_sysfs_attrs(hdev); \ 888 return count; \ 889 } \ 890 static ssize_t name##_show(struct device *kdev, \ 891 struct device_attribute *attr, char *buf) \ 892 { \ 893 struct hid_device *hdev = to_hid_device(kdev); \ 894 struct cp2112_usb_config_report cfg; \ 895 int ret = cp2112_get_usb_config(hdev, &cfg); \ 896 if (ret) \ 897 return ret; \ 898 return scnprintf(buf, PAGE_SIZE, format, ##__VA_ARGS__); \ 899 } \ 900 static DEVICE_ATTR_RW(name); 901 902 CP2112_CONFIG_ATTR(vendor_id, ({ 903 u16 vid; 904 905 if (sscanf(buf, "%hi", &vid) != 1) 906 return -EINVAL; 907 908 cfg.vid = cpu_to_le16(vid); 909 cfg.mask = 0x01; 910 }), "0x%04x\n", le16_to_cpu(cfg.vid)); 911 912 CP2112_CONFIG_ATTR(product_id, ({ 913 u16 pid; 914 915 if (sscanf(buf, "%hi", &pid) != 1) 916 return -EINVAL; 917 918 cfg.pid = cpu_to_le16(pid); 919 cfg.mask = 0x02; 920 }), "0x%04x\n", le16_to_cpu(cfg.pid)); 921 922 CP2112_CONFIG_ATTR(max_power, ({ 923 int mA; 924 925 if (sscanf(buf, "%i", &mA) != 1) 926 return -EINVAL; 927 928 cfg.max_power = (mA + 1) / 2; 929 cfg.mask = 0x04; 930 }), "%u mA\n", cfg.max_power * 2); 931 932 CP2112_CONFIG_ATTR(power_mode, ({ 933 if (sscanf(buf, "%hhi", &cfg.power_mode) != 1) 934 return -EINVAL; 935 936 cfg.mask = 0x08; 937 }), "%u\n", cfg.power_mode); 938 939 CP2112_CONFIG_ATTR(release_version, ({ 940 if (sscanf(buf, "%hhi.%hhi", &cfg.release_major, &cfg.release_minor) 941 != 2) 942 return -EINVAL; 943 944 cfg.mask = 0x10; 945 }), "%u.%u\n", cfg.release_major, cfg.release_minor); 946 947 #undef CP2112_CONFIG_ATTR 948 949 struct cp2112_pstring_attribute { 950 struct device_attribute attr; 951 unsigned char report; 952 }; 953 954 static ssize_t pstr_store(struct device *kdev, 955 struct device_attribute *kattr, const char *buf, 956 size_t count) 957 { 958 struct hid_device *hdev = to_hid_device(kdev); 959 struct cp2112_pstring_attribute *attr = 960 container_of(kattr, struct cp2112_pstring_attribute, attr); 961 struct cp2112_string_report report; 962 int ret; 963 964 memset(&report, 0, sizeof(report)); 965 966 ret = utf8s_to_utf16s(buf, count, UTF16_LITTLE_ENDIAN, 967 report.string, ARRAY_SIZE(report.string)); 968 report.report = attr->report; 969 report.length = ret * sizeof(report.string[0]) + 2; 970 report.type = USB_DT_STRING; 971 972 ret = cp2112_hid_output(hdev, &report.report, report.length + 1, 973 HID_FEATURE_REPORT); 974 if (ret != report.length + 1) { 975 hid_err(hdev, "error writing %s string: %d\n", kattr->attr.name, 976 ret); 977 if (ret < 0) 978 return ret; 979 return -EIO; 980 } 981 982 chmod_sysfs_attrs(hdev); 983 return count; 984 } 985 986 static ssize_t pstr_show(struct device *kdev, 987 struct device_attribute *kattr, char *buf) 988 { 989 struct hid_device *hdev = to_hid_device(kdev); 990 struct cp2112_pstring_attribute *attr = 991 container_of(kattr, struct cp2112_pstring_attribute, attr); 992 struct cp2112_string_report report; 993 u8 length; 994 int ret; 995 996 ret = cp2112_hid_get(hdev, attr->report, (u8 *)&report.contents, 997 sizeof(report.contents), HID_FEATURE_REPORT); 998 if (ret < 3) { 999 hid_err(hdev, "error reading %s string: %d\n", kattr->attr.name, 1000 ret); 1001 if (ret < 0) 1002 return ret; 1003 return -EIO; 1004 } 1005 1006 if (report.length < 2) { 1007 hid_err(hdev, "invalid %s string length: %d\n", 1008 kattr->attr.name, report.length); 1009 return -EIO; 1010 } 1011 1012 length = report.length > ret - 1 ? ret - 1 : report.length; 1013 length = (length - 2) / sizeof(report.string[0]); 1014 ret = utf16s_to_utf8s(report.string, length, UTF16_LITTLE_ENDIAN, buf, 1015 PAGE_SIZE - 1); 1016 buf[ret++] = '\n'; 1017 return ret; 1018 } 1019 1020 #define CP2112_PSTR_ATTR(name, _report) \ 1021 static struct cp2112_pstring_attribute dev_attr_##name = { \ 1022 .attr = __ATTR(name, (S_IWUSR | S_IRUGO), pstr_show, pstr_store), \ 1023 .report = _report, \ 1024 }; 1025 1026 CP2112_PSTR_ATTR(manufacturer, CP2112_MANUFACTURER_STRING); 1027 CP2112_PSTR_ATTR(product, CP2112_PRODUCT_STRING); 1028 CP2112_PSTR_ATTR(serial, CP2112_SERIAL_STRING); 1029 1030 #undef CP2112_PSTR_ATTR 1031 1032 static const struct attribute_group cp2112_attr_group = { 1033 .attrs = (struct attribute *[]){ 1034 &dev_attr_vendor_id.attr, 1035 &dev_attr_product_id.attr, 1036 &dev_attr_max_power.attr, 1037 &dev_attr_power_mode.attr, 1038 &dev_attr_release_version.attr, 1039 &dev_attr_manufacturer.attr.attr, 1040 &dev_attr_product.attr.attr, 1041 &dev_attr_serial.attr.attr, 1042 NULL 1043 } 1044 }; 1045 1046 /* Chmoding our sysfs attributes is simply a way to expose which fields in the 1047 * PROM have already been programmed. We do not depend on this preventing 1048 * writing to these attributes since the CP2112 will simply ignore writes to 1049 * already-programmed fields. This is why there is no sense in fixing this 1050 * racy behaviour. 1051 */ 1052 static void chmod_sysfs_attrs(struct hid_device *hdev) 1053 { 1054 struct attribute **attr; 1055 u8 buf[2]; 1056 int ret; 1057 1058 ret = cp2112_hid_get(hdev, CP2112_LOCK_BYTE, buf, sizeof(buf), 1059 HID_FEATURE_REPORT); 1060 if (ret != sizeof(buf)) { 1061 hid_err(hdev, "error reading lock byte: %d\n", ret); 1062 return; 1063 } 1064 1065 for (attr = cp2112_attr_group.attrs; *attr; ++attr) { 1066 umode_t mode = (buf[1] & 1) ? S_IWUSR | S_IRUGO : S_IRUGO; 1067 ret = sysfs_chmod_file(&hdev->dev.kobj, *attr, mode); 1068 if (ret < 0) 1069 hid_err(hdev, "error chmoding sysfs file %s\n", 1070 (*attr)->name); 1071 buf[1] >>= 1; 1072 } 1073 } 1074 1075 static void cp2112_gpio_irq_ack(struct irq_data *d) 1076 { 1077 } 1078 1079 static void cp2112_gpio_irq_mask(struct irq_data *d) 1080 { 1081 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1082 struct cp2112_device *dev = gpiochip_get_data(gc); 1083 1084 __clear_bit(d->hwirq, &dev->irq_mask); 1085 } 1086 1087 static void cp2112_gpio_irq_unmask(struct irq_data *d) 1088 { 1089 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1090 struct cp2112_device *dev = gpiochip_get_data(gc); 1091 1092 __set_bit(d->hwirq, &dev->irq_mask); 1093 } 1094 1095 static void cp2112_gpio_poll_callback(struct work_struct *work) 1096 { 1097 struct cp2112_device *dev = container_of(work, struct cp2112_device, 1098 gpio_poll_worker.work); 1099 struct irq_data *d; 1100 u8 gpio_mask; 1101 u8 virqs = (u8)dev->irq_mask; 1102 u32 irq_type; 1103 int irq, virq, ret; 1104 1105 ret = cp2112_gpio_get_all(&dev->gc); 1106 if (ret == -ENODEV) /* the hardware has been disconnected */ 1107 return; 1108 if (ret < 0) 1109 goto exit; 1110 1111 gpio_mask = ret; 1112 1113 while (virqs) { 1114 virq = ffs(virqs) - 1; 1115 virqs &= ~BIT(virq); 1116 1117 if (!dev->gc.to_irq) 1118 break; 1119 1120 irq = dev->gc.to_irq(&dev->gc, virq); 1121 1122 d = irq_get_irq_data(irq); 1123 if (!d) 1124 continue; 1125 1126 irq_type = irqd_get_trigger_type(d); 1127 1128 if (gpio_mask & BIT(virq)) { 1129 /* Level High */ 1130 1131 if (irq_type & IRQ_TYPE_LEVEL_HIGH) 1132 handle_nested_irq(irq); 1133 1134 if ((irq_type & IRQ_TYPE_EDGE_RISING) && 1135 !(dev->gpio_prev_state & BIT(virq))) 1136 handle_nested_irq(irq); 1137 } else { 1138 /* Level Low */ 1139 1140 if (irq_type & IRQ_TYPE_LEVEL_LOW) 1141 handle_nested_irq(irq); 1142 1143 if ((irq_type & IRQ_TYPE_EDGE_FALLING) && 1144 (dev->gpio_prev_state & BIT(virq))) 1145 handle_nested_irq(irq); 1146 } 1147 } 1148 1149 dev->gpio_prev_state = gpio_mask; 1150 1151 exit: 1152 if (dev->gpio_poll) 1153 schedule_delayed_work(&dev->gpio_poll_worker, 10); 1154 } 1155 1156 1157 static unsigned int cp2112_gpio_irq_startup(struct irq_data *d) 1158 { 1159 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1160 struct cp2112_device *dev = gpiochip_get_data(gc); 1161 1162 INIT_DELAYED_WORK(&dev->gpio_poll_worker, cp2112_gpio_poll_callback); 1163 1164 if (!dev->gpio_poll) { 1165 dev->gpio_poll = true; 1166 schedule_delayed_work(&dev->gpio_poll_worker, 0); 1167 } 1168 1169 cp2112_gpio_irq_unmask(d); 1170 return 0; 1171 } 1172 1173 static void cp2112_gpio_irq_shutdown(struct irq_data *d) 1174 { 1175 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1176 struct cp2112_device *dev = gpiochip_get_data(gc); 1177 1178 cancel_delayed_work_sync(&dev->gpio_poll_worker); 1179 } 1180 1181 static int cp2112_gpio_irq_type(struct irq_data *d, unsigned int type) 1182 { 1183 return 0; 1184 } 1185 1186 static int __maybe_unused cp2112_allocate_irq(struct cp2112_device *dev, 1187 int pin) 1188 { 1189 int ret; 1190 1191 if (dev->desc[pin]) 1192 return -EINVAL; 1193 1194 dev->desc[pin] = gpiochip_request_own_desc(&dev->gc, pin, 1195 "HID/I2C:Event", 1196 GPIO_ACTIVE_HIGH, 1197 GPIOD_IN); 1198 if (IS_ERR(dev->desc[pin])) { 1199 dev_err(dev->gc.parent, "Failed to request GPIO\n"); 1200 return PTR_ERR(dev->desc[pin]); 1201 } 1202 1203 ret = cp2112_gpio_direction_input(&dev->gc, pin); 1204 if (ret < 0) { 1205 dev_err(dev->gc.parent, "Failed to set GPIO to input dir\n"); 1206 goto err_desc; 1207 } 1208 1209 ret = gpiochip_lock_as_irq(&dev->gc, pin); 1210 if (ret) { 1211 dev_err(dev->gc.parent, "Failed to lock GPIO as interrupt\n"); 1212 goto err_desc; 1213 } 1214 1215 ret = gpiod_to_irq(dev->desc[pin]); 1216 if (ret < 0) { 1217 dev_err(dev->gc.parent, "Failed to translate GPIO to IRQ\n"); 1218 goto err_lock; 1219 } 1220 1221 return ret; 1222 1223 err_lock: 1224 gpiochip_unlock_as_irq(&dev->gc, pin); 1225 err_desc: 1226 gpiochip_free_own_desc(dev->desc[pin]); 1227 dev->desc[pin] = NULL; 1228 return ret; 1229 } 1230 1231 static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id) 1232 { 1233 struct cp2112_device *dev; 1234 u8 buf[3]; 1235 struct cp2112_smbus_config_report config; 1236 struct gpio_irq_chip *girq; 1237 int ret; 1238 1239 dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL); 1240 if (!dev) 1241 return -ENOMEM; 1242 1243 dev->in_out_buffer = devm_kzalloc(&hdev->dev, CP2112_REPORT_MAX_LENGTH, 1244 GFP_KERNEL); 1245 if (!dev->in_out_buffer) 1246 return -ENOMEM; 1247 1248 mutex_init(&dev->lock); 1249 1250 ret = hid_parse(hdev); 1251 if (ret) { 1252 hid_err(hdev, "parse failed\n"); 1253 return ret; 1254 } 1255 1256 ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW); 1257 if (ret) { 1258 hid_err(hdev, "hw start failed\n"); 1259 return ret; 1260 } 1261 1262 ret = hid_hw_open(hdev); 1263 if (ret) { 1264 hid_err(hdev, "hw open failed\n"); 1265 goto err_hid_stop; 1266 } 1267 1268 ret = hid_hw_power(hdev, PM_HINT_FULLON); 1269 if (ret < 0) { 1270 hid_err(hdev, "power management error: %d\n", ret); 1271 goto err_hid_close; 1272 } 1273 1274 ret = cp2112_hid_get(hdev, CP2112_GET_VERSION_INFO, buf, sizeof(buf), 1275 HID_FEATURE_REPORT); 1276 if (ret != sizeof(buf)) { 1277 hid_err(hdev, "error requesting version\n"); 1278 if (ret >= 0) 1279 ret = -EIO; 1280 goto err_power_normal; 1281 } 1282 1283 hid_info(hdev, "Part Number: 0x%02X Device Version: 0x%02X\n", 1284 buf[1], buf[2]); 1285 1286 ret = cp2112_hid_get(hdev, CP2112_SMBUS_CONFIG, (u8 *)&config, 1287 sizeof(config), HID_FEATURE_REPORT); 1288 if (ret != sizeof(config)) { 1289 hid_err(hdev, "error requesting SMBus config\n"); 1290 if (ret >= 0) 1291 ret = -EIO; 1292 goto err_power_normal; 1293 } 1294 1295 config.retry_time = cpu_to_be16(1); 1296 1297 ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config), 1298 HID_FEATURE_REPORT); 1299 if (ret != sizeof(config)) { 1300 hid_err(hdev, "error setting SMBus config\n"); 1301 if (ret >= 0) 1302 ret = -EIO; 1303 goto err_power_normal; 1304 } 1305 1306 hid_set_drvdata(hdev, (void *)dev); 1307 dev->hdev = hdev; 1308 dev->adap.owner = THIS_MODULE; 1309 dev->adap.class = I2C_CLASS_HWMON; 1310 dev->adap.algo = &smbus_algorithm; 1311 dev->adap.algo_data = dev; 1312 dev->adap.dev.parent = &hdev->dev; 1313 snprintf(dev->adap.name, sizeof(dev->adap.name), 1314 "CP2112 SMBus Bridge on hidraw%d", 1315 ((struct hidraw *)hdev->hidraw)->minor); 1316 dev->hwversion = buf[2]; 1317 init_waitqueue_head(&dev->wait); 1318 1319 hid_device_io_start(hdev); 1320 ret = i2c_add_adapter(&dev->adap); 1321 hid_device_io_stop(hdev); 1322 1323 if (ret) { 1324 hid_err(hdev, "error registering i2c adapter\n"); 1325 goto err_power_normal; 1326 } 1327 1328 hid_dbg(hdev, "adapter registered\n"); 1329 1330 dev->gc.label = "cp2112_gpio"; 1331 dev->gc.direction_input = cp2112_gpio_direction_input; 1332 dev->gc.direction_output = cp2112_gpio_direction_output; 1333 dev->gc.set = cp2112_gpio_set; 1334 dev->gc.get = cp2112_gpio_get; 1335 dev->gc.base = -1; 1336 dev->gc.ngpio = 8; 1337 dev->gc.can_sleep = 1; 1338 dev->gc.parent = &hdev->dev; 1339 1340 dev->irq.name = "cp2112-gpio"; 1341 dev->irq.irq_startup = cp2112_gpio_irq_startup; 1342 dev->irq.irq_shutdown = cp2112_gpio_irq_shutdown; 1343 dev->irq.irq_ack = cp2112_gpio_irq_ack; 1344 dev->irq.irq_mask = cp2112_gpio_irq_mask; 1345 dev->irq.irq_unmask = cp2112_gpio_irq_unmask; 1346 dev->irq.irq_set_type = cp2112_gpio_irq_type; 1347 dev->irq.flags = IRQCHIP_MASK_ON_SUSPEND; 1348 1349 girq = &dev->gc.irq; 1350 girq->chip = &dev->irq; 1351 /* The event comes from the outside so no parent handler */ 1352 girq->parent_handler = NULL; 1353 girq->num_parents = 0; 1354 girq->parents = NULL; 1355 girq->default_type = IRQ_TYPE_NONE; 1356 girq->handler = handle_simple_irq; 1357 girq->threaded = true; 1358 1359 ret = gpiochip_add_data(&dev->gc, dev); 1360 if (ret < 0) { 1361 hid_err(hdev, "error registering gpio chip\n"); 1362 goto err_free_i2c; 1363 } 1364 1365 ret = sysfs_create_group(&hdev->dev.kobj, &cp2112_attr_group); 1366 if (ret < 0) { 1367 hid_err(hdev, "error creating sysfs attrs\n"); 1368 goto err_gpiochip_remove; 1369 } 1370 1371 chmod_sysfs_attrs(hdev); 1372 hid_hw_power(hdev, PM_HINT_NORMAL); 1373 1374 return ret; 1375 1376 err_gpiochip_remove: 1377 gpiochip_remove(&dev->gc); 1378 err_free_i2c: 1379 i2c_del_adapter(&dev->adap); 1380 err_power_normal: 1381 hid_hw_power(hdev, PM_HINT_NORMAL); 1382 err_hid_close: 1383 hid_hw_close(hdev); 1384 err_hid_stop: 1385 hid_hw_stop(hdev); 1386 return ret; 1387 } 1388 1389 static void cp2112_remove(struct hid_device *hdev) 1390 { 1391 struct cp2112_device *dev = hid_get_drvdata(hdev); 1392 int i; 1393 1394 sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group); 1395 i2c_del_adapter(&dev->adap); 1396 1397 if (dev->gpio_poll) { 1398 dev->gpio_poll = false; 1399 cancel_delayed_work_sync(&dev->gpio_poll_worker); 1400 } 1401 1402 for (i = 0; i < ARRAY_SIZE(dev->desc); i++) { 1403 gpiochip_unlock_as_irq(&dev->gc, i); 1404 gpiochip_free_own_desc(dev->desc[i]); 1405 } 1406 1407 gpiochip_remove(&dev->gc); 1408 /* i2c_del_adapter has finished removing all i2c devices from our 1409 * adapter. Well behaved devices should no longer call our cp2112_xfer 1410 * and should have waited for any pending calls to finish. It has also 1411 * waited for device_unregister(&adap->dev) to complete. Therefore we 1412 * can safely free our struct cp2112_device. 1413 */ 1414 hid_hw_close(hdev); 1415 hid_hw_stop(hdev); 1416 } 1417 1418 static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report, 1419 u8 *data, int size) 1420 { 1421 struct cp2112_device *dev = hid_get_drvdata(hdev); 1422 struct cp2112_xfer_status_report *xfer = (void *)data; 1423 1424 switch (data[0]) { 1425 case CP2112_TRANSFER_STATUS_RESPONSE: 1426 hid_dbg(hdev, "xfer status: %02x %02x %04x %04x\n", 1427 xfer->status0, xfer->status1, 1428 be16_to_cpu(xfer->retries), be16_to_cpu(xfer->length)); 1429 1430 switch (xfer->status0) { 1431 case STATUS0_IDLE: 1432 dev->xfer_status = -EAGAIN; 1433 break; 1434 case STATUS0_BUSY: 1435 dev->xfer_status = -EBUSY; 1436 break; 1437 case STATUS0_COMPLETE: 1438 dev->xfer_status = be16_to_cpu(xfer->length); 1439 break; 1440 case STATUS0_ERROR: 1441 switch (xfer->status1) { 1442 case STATUS1_TIMEOUT_NACK: 1443 case STATUS1_TIMEOUT_BUS: 1444 dev->xfer_status = -ETIMEDOUT; 1445 break; 1446 default: 1447 dev->xfer_status = -EIO; 1448 break; 1449 } 1450 break; 1451 default: 1452 dev->xfer_status = -EINVAL; 1453 break; 1454 } 1455 1456 atomic_set(&dev->xfer_avail, 1); 1457 break; 1458 case CP2112_DATA_READ_RESPONSE: 1459 hid_dbg(hdev, "read response: %02x %02x\n", data[1], data[2]); 1460 1461 dev->read_length = data[2]; 1462 if (dev->read_length > sizeof(dev->read_data)) 1463 dev->read_length = sizeof(dev->read_data); 1464 1465 memcpy(dev->read_data, &data[3], dev->read_length); 1466 atomic_set(&dev->read_avail, 1); 1467 break; 1468 default: 1469 hid_err(hdev, "unknown report\n"); 1470 1471 return 0; 1472 } 1473 1474 wake_up_interruptible(&dev->wait); 1475 return 1; 1476 } 1477 1478 static struct hid_driver cp2112_driver = { 1479 .name = "cp2112", 1480 .id_table = cp2112_devices, 1481 .probe = cp2112_probe, 1482 .remove = cp2112_remove, 1483 .raw_event = cp2112_raw_event, 1484 }; 1485 1486 module_hid_driver(cp2112_driver); 1487 MODULE_DESCRIPTION("Silicon Labs HID USB to SMBus master bridge"); 1488 MODULE_AUTHOR("David Barksdale <dbarksdale@uplogix.com>"); 1489 MODULE_LICENSE("GPL"); 1490 1491