1 /* 2 * hid-cp2112.c - Silicon Labs HID USB to SMBus master bridge 3 * Copyright (c) 2013,2014 Uplogix, Inc. 4 * David Barksdale <dbarksdale@uplogix.com> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms and conditions of the GNU General Public License, 8 * version 2, as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 * more details. 14 */ 15 16 /* 17 * The Silicon Labs CP2112 chip is a USB HID device which provides an 18 * SMBus controller for talking to slave devices and 8 GPIO pins. The 19 * host communicates with the CP2112 via raw HID reports. 20 * 21 * Data Sheet: 22 * http://www.silabs.com/Support%20Documents/TechnicalDocs/CP2112.pdf 23 * Programming Interface Specification: 24 * http://www.silabs.com/Support%20Documents/TechnicalDocs/AN495.pdf 25 */ 26 27 #include <linux/gpio.h> 28 #include <linux/gpio/driver.h> 29 #include <linux/hid.h> 30 #include <linux/i2c.h> 31 #include <linux/module.h> 32 #include <linux/nls.h> 33 #include <linux/usb/ch9.h> 34 #include "hid-ids.h" 35 36 #define CP2112_REPORT_MAX_LENGTH 64 37 #define CP2112_GPIO_CONFIG_LENGTH 5 38 #define CP2112_GPIO_GET_LENGTH 2 39 #define CP2112_GPIO_SET_LENGTH 3 40 41 enum { 42 CP2112_GPIO_CONFIG = 0x02, 43 CP2112_GPIO_GET = 0x03, 44 CP2112_GPIO_SET = 0x04, 45 CP2112_GET_VERSION_INFO = 0x05, 46 CP2112_SMBUS_CONFIG = 0x06, 47 CP2112_DATA_READ_REQUEST = 0x10, 48 CP2112_DATA_WRITE_READ_REQUEST = 0x11, 49 CP2112_DATA_READ_FORCE_SEND = 0x12, 50 CP2112_DATA_READ_RESPONSE = 0x13, 51 CP2112_DATA_WRITE_REQUEST = 0x14, 52 CP2112_TRANSFER_STATUS_REQUEST = 0x15, 53 CP2112_TRANSFER_STATUS_RESPONSE = 0x16, 54 CP2112_CANCEL_TRANSFER = 0x17, 55 CP2112_LOCK_BYTE = 0x20, 56 CP2112_USB_CONFIG = 0x21, 57 CP2112_MANUFACTURER_STRING = 0x22, 58 CP2112_PRODUCT_STRING = 0x23, 59 CP2112_SERIAL_STRING = 0x24, 60 }; 61 62 enum { 63 STATUS0_IDLE = 0x00, 64 STATUS0_BUSY = 0x01, 65 STATUS0_COMPLETE = 0x02, 66 STATUS0_ERROR = 0x03, 67 }; 68 69 enum { 70 STATUS1_TIMEOUT_NACK = 0x00, 71 STATUS1_TIMEOUT_BUS = 0x01, 72 STATUS1_ARBITRATION_LOST = 0x02, 73 STATUS1_READ_INCOMPLETE = 0x03, 74 STATUS1_WRITE_INCOMPLETE = 0x04, 75 STATUS1_SUCCESS = 0x05, 76 }; 77 78 struct cp2112_smbus_config_report { 79 u8 report; /* CP2112_SMBUS_CONFIG */ 80 __be32 clock_speed; /* Hz */ 81 u8 device_address; /* Stored in the upper 7 bits */ 82 u8 auto_send_read; /* 1 = enabled, 0 = disabled */ 83 __be16 write_timeout; /* ms, 0 = no timeout */ 84 __be16 read_timeout; /* ms, 0 = no timeout */ 85 u8 scl_low_timeout; /* 1 = enabled, 0 = disabled */ 86 __be16 retry_time; /* # of retries, 0 = no limit */ 87 } __packed; 88 89 struct cp2112_usb_config_report { 90 u8 report; /* CP2112_USB_CONFIG */ 91 __le16 vid; /* Vendor ID */ 92 __le16 pid; /* Product ID */ 93 u8 max_power; /* Power requested in 2mA units */ 94 u8 power_mode; /* 0x00 = bus powered 95 0x01 = self powered & regulator off 96 0x02 = self powered & regulator on */ 97 u8 release_major; 98 u8 release_minor; 99 u8 mask; /* What fields to program */ 100 } __packed; 101 102 struct cp2112_read_req_report { 103 u8 report; /* CP2112_DATA_READ_REQUEST */ 104 u8 slave_address; 105 __be16 length; 106 } __packed; 107 108 struct cp2112_write_read_req_report { 109 u8 report; /* CP2112_DATA_WRITE_READ_REQUEST */ 110 u8 slave_address; 111 __be16 length; 112 u8 target_address_length; 113 u8 target_address[16]; 114 } __packed; 115 116 struct cp2112_write_req_report { 117 u8 report; /* CP2112_DATA_WRITE_REQUEST */ 118 u8 slave_address; 119 u8 length; 120 u8 data[61]; 121 } __packed; 122 123 struct cp2112_force_read_report { 124 u8 report; /* CP2112_DATA_READ_FORCE_SEND */ 125 __be16 length; 126 } __packed; 127 128 struct cp2112_xfer_status_report { 129 u8 report; /* CP2112_TRANSFER_STATUS_RESPONSE */ 130 u8 status0; /* STATUS0_* */ 131 u8 status1; /* STATUS1_* */ 132 __be16 retries; 133 __be16 length; 134 } __packed; 135 136 struct cp2112_string_report { 137 u8 dummy; /* force .string to be aligned */ 138 u8 report; /* CP2112_*_STRING */ 139 u8 length; /* length in bytes of everyting after .report */ 140 u8 type; /* USB_DT_STRING */ 141 wchar_t string[30]; /* UTF16_LITTLE_ENDIAN string */ 142 } __packed; 143 144 /* Number of times to request transfer status before giving up waiting for a 145 transfer to complete. This may need to be changed if SMBUS clock, retries, 146 or read/write/scl_low timeout settings are changed. */ 147 static const int XFER_STATUS_RETRIES = 10; 148 149 /* Time in ms to wait for a CP2112_DATA_READ_RESPONSE or 150 CP2112_TRANSFER_STATUS_RESPONSE. */ 151 static const int RESPONSE_TIMEOUT = 50; 152 153 static const struct hid_device_id cp2112_devices[] = { 154 { HID_USB_DEVICE(USB_VENDOR_ID_CYGNAL, USB_DEVICE_ID_CYGNAL_CP2112) }, 155 { } 156 }; 157 MODULE_DEVICE_TABLE(hid, cp2112_devices); 158 159 struct cp2112_device { 160 struct i2c_adapter adap; 161 struct hid_device *hdev; 162 wait_queue_head_t wait; 163 u8 read_data[61]; 164 u8 read_length; 165 u8 hwversion; 166 int xfer_status; 167 atomic_t read_avail; 168 atomic_t xfer_avail; 169 struct gpio_chip gc; 170 u8 *in_out_buffer; 171 spinlock_t lock; 172 173 struct gpio_desc *desc[8]; 174 bool gpio_poll; 175 struct delayed_work gpio_poll_worker; 176 unsigned long irq_mask; 177 u8 gpio_prev_state; 178 }; 179 180 static int gpio_push_pull = 0xFF; 181 module_param(gpio_push_pull, int, S_IRUGO | S_IWUSR); 182 MODULE_PARM_DESC(gpio_push_pull, "GPIO push-pull configuration bitmask"); 183 184 static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset) 185 { 186 struct cp2112_device *dev = gpiochip_get_data(chip); 187 struct hid_device *hdev = dev->hdev; 188 u8 *buf = dev->in_out_buffer; 189 unsigned long flags; 190 int ret; 191 192 spin_lock_irqsave(&dev->lock, flags); 193 194 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, 195 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, 196 HID_REQ_GET_REPORT); 197 if (ret != CP2112_GPIO_CONFIG_LENGTH) { 198 hid_err(hdev, "error requesting GPIO config: %d\n", ret); 199 goto exit; 200 } 201 202 buf[1] &= ~(1 << offset); 203 buf[2] = gpio_push_pull; 204 205 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, 206 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, 207 HID_REQ_SET_REPORT); 208 if (ret < 0) { 209 hid_err(hdev, "error setting GPIO config: %d\n", ret); 210 goto exit; 211 } 212 213 ret = 0; 214 215 exit: 216 spin_unlock_irqrestore(&dev->lock, flags); 217 return ret <= 0 ? ret : -EIO; 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 unsigned long flags; 226 int ret; 227 228 spin_lock_irqsave(&dev->lock, flags); 229 230 buf[0] = CP2112_GPIO_SET; 231 buf[1] = value ? 0xff : 0; 232 buf[2] = 1 << offset; 233 234 ret = hid_hw_raw_request(hdev, CP2112_GPIO_SET, buf, 235 CP2112_GPIO_SET_LENGTH, HID_FEATURE_REPORT, 236 HID_REQ_SET_REPORT); 237 if (ret < 0) 238 hid_err(hdev, "error setting GPIO values: %d\n", ret); 239 240 spin_unlock_irqrestore(&dev->lock, flags); 241 } 242 243 static int cp2112_gpio_get_all(struct gpio_chip *chip) 244 { 245 struct cp2112_device *dev = gpiochip_get_data(chip); 246 struct hid_device *hdev = dev->hdev; 247 u8 *buf = dev->in_out_buffer; 248 unsigned long flags; 249 int ret; 250 251 spin_lock_irqsave(&dev->lock, flags); 252 253 ret = hid_hw_raw_request(hdev, CP2112_GPIO_GET, buf, 254 CP2112_GPIO_GET_LENGTH, HID_FEATURE_REPORT, 255 HID_REQ_GET_REPORT); 256 if (ret != CP2112_GPIO_GET_LENGTH) { 257 hid_err(hdev, "error requesting GPIO values: %d\n", ret); 258 ret = ret < 0 ? ret : -EIO; 259 goto exit; 260 } 261 262 ret = buf[1]; 263 264 exit: 265 spin_unlock_irqrestore(&dev->lock, flags); 266 267 return ret; 268 } 269 270 static int cp2112_gpio_get(struct gpio_chip *chip, unsigned int offset) 271 { 272 int ret; 273 274 ret = cp2112_gpio_get_all(chip); 275 if (ret < 0) 276 return ret; 277 278 return (ret >> offset) & 1; 279 } 280 281 static int cp2112_gpio_direction_output(struct gpio_chip *chip, 282 unsigned offset, int value) 283 { 284 struct cp2112_device *dev = gpiochip_get_data(chip); 285 struct hid_device *hdev = dev->hdev; 286 u8 *buf = dev->in_out_buffer; 287 unsigned long flags; 288 int ret; 289 290 spin_lock_irqsave(&dev->lock, flags); 291 292 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, 293 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, 294 HID_REQ_GET_REPORT); 295 if (ret != CP2112_GPIO_CONFIG_LENGTH) { 296 hid_err(hdev, "error requesting GPIO config: %d\n", ret); 297 goto fail; 298 } 299 300 buf[1] |= 1 << offset; 301 buf[2] = gpio_push_pull; 302 303 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, 304 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, 305 HID_REQ_SET_REPORT); 306 if (ret < 0) { 307 hid_err(hdev, "error setting GPIO config: %d\n", ret); 308 goto fail; 309 } 310 311 spin_unlock_irqrestore(&dev->lock, flags); 312 313 /* 314 * Set gpio value when output direction is already set, 315 * as specified in AN495, Rev. 0.2, cpt. 4.4 316 */ 317 cp2112_gpio_set(chip, offset, value); 318 319 return 0; 320 321 fail: 322 spin_unlock_irqrestore(&dev->lock, flags); 323 return ret < 0 ? ret : -EIO; 324 } 325 326 static int cp2112_hid_get(struct hid_device *hdev, unsigned char report_number, 327 u8 *data, size_t count, unsigned char report_type) 328 { 329 u8 *buf; 330 int ret; 331 332 buf = kmalloc(count, GFP_KERNEL); 333 if (!buf) 334 return -ENOMEM; 335 336 ret = hid_hw_raw_request(hdev, report_number, buf, count, 337 report_type, HID_REQ_GET_REPORT); 338 memcpy(data, buf, count); 339 kfree(buf); 340 return ret; 341 } 342 343 static int cp2112_hid_output(struct hid_device *hdev, u8 *data, size_t count, 344 unsigned char report_type) 345 { 346 u8 *buf; 347 int ret; 348 349 buf = kmemdup(data, count, GFP_KERNEL); 350 if (!buf) 351 return -ENOMEM; 352 353 if (report_type == HID_OUTPUT_REPORT) 354 ret = hid_hw_output_report(hdev, buf, count); 355 else 356 ret = hid_hw_raw_request(hdev, buf[0], buf, count, report_type, 357 HID_REQ_SET_REPORT); 358 359 kfree(buf); 360 return ret; 361 } 362 363 static int cp2112_wait(struct cp2112_device *dev, atomic_t *avail) 364 { 365 int ret = 0; 366 367 /* We have sent either a CP2112_TRANSFER_STATUS_REQUEST or a 368 * CP2112_DATA_READ_FORCE_SEND and we are waiting for the response to 369 * come in cp2112_raw_event or timeout. There will only be one of these 370 * in flight at any one time. The timeout is extremely large and is a 371 * last resort if the CP2112 has died. If we do timeout we don't expect 372 * to receive the response which would cause data races, it's not like 373 * we can do anything about it anyway. 374 */ 375 ret = wait_event_interruptible_timeout(dev->wait, 376 atomic_read(avail), msecs_to_jiffies(RESPONSE_TIMEOUT)); 377 if (-ERESTARTSYS == ret) 378 return ret; 379 if (!ret) 380 return -ETIMEDOUT; 381 382 atomic_set(avail, 0); 383 return 0; 384 } 385 386 static int cp2112_xfer_status(struct cp2112_device *dev) 387 { 388 struct hid_device *hdev = dev->hdev; 389 u8 buf[2]; 390 int ret; 391 392 buf[0] = CP2112_TRANSFER_STATUS_REQUEST; 393 buf[1] = 0x01; 394 atomic_set(&dev->xfer_avail, 0); 395 396 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); 397 if (ret < 0) { 398 hid_warn(hdev, "Error requesting status: %d\n", ret); 399 return ret; 400 } 401 402 ret = cp2112_wait(dev, &dev->xfer_avail); 403 if (ret) 404 return ret; 405 406 return dev->xfer_status; 407 } 408 409 static int cp2112_read(struct cp2112_device *dev, u8 *data, size_t size) 410 { 411 struct hid_device *hdev = dev->hdev; 412 struct cp2112_force_read_report report; 413 int ret; 414 415 if (size > sizeof(dev->read_data)) 416 size = sizeof(dev->read_data); 417 report.report = CP2112_DATA_READ_FORCE_SEND; 418 report.length = cpu_to_be16(size); 419 420 atomic_set(&dev->read_avail, 0); 421 422 ret = cp2112_hid_output(hdev, &report.report, sizeof(report), 423 HID_OUTPUT_REPORT); 424 if (ret < 0) { 425 hid_warn(hdev, "Error requesting data: %d\n", ret); 426 return ret; 427 } 428 429 ret = cp2112_wait(dev, &dev->read_avail); 430 if (ret) 431 return ret; 432 433 hid_dbg(hdev, "read %d of %zd bytes requested\n", 434 dev->read_length, size); 435 436 if (size > dev->read_length) 437 size = dev->read_length; 438 439 memcpy(data, dev->read_data, size); 440 return dev->read_length; 441 } 442 443 static int cp2112_read_req(void *buf, u8 slave_address, u16 length) 444 { 445 struct cp2112_read_req_report *report = buf; 446 447 if (length < 1 || length > 512) 448 return -EINVAL; 449 450 report->report = CP2112_DATA_READ_REQUEST; 451 report->slave_address = slave_address << 1; 452 report->length = cpu_to_be16(length); 453 return sizeof(*report); 454 } 455 456 static int cp2112_write_read_req(void *buf, u8 slave_address, u16 length, 457 u8 command, u8 *data, u8 data_length) 458 { 459 struct cp2112_write_read_req_report *report = buf; 460 461 if (length < 1 || length > 512 462 || data_length > sizeof(report->target_address) - 1) 463 return -EINVAL; 464 465 report->report = CP2112_DATA_WRITE_READ_REQUEST; 466 report->slave_address = slave_address << 1; 467 report->length = cpu_to_be16(length); 468 report->target_address_length = data_length + 1; 469 report->target_address[0] = command; 470 memcpy(&report->target_address[1], data, data_length); 471 return data_length + 6; 472 } 473 474 static int cp2112_write_req(void *buf, u8 slave_address, u8 command, u8 *data, 475 u8 data_length) 476 { 477 struct cp2112_write_req_report *report = buf; 478 479 if (data_length > sizeof(report->data) - 1) 480 return -EINVAL; 481 482 report->report = CP2112_DATA_WRITE_REQUEST; 483 report->slave_address = slave_address << 1; 484 report->length = data_length + 1; 485 report->data[0] = command; 486 memcpy(&report->data[1], data, data_length); 487 return data_length + 4; 488 } 489 490 static int cp2112_i2c_write_req(void *buf, u8 slave_address, u8 *data, 491 u8 data_length) 492 { 493 struct cp2112_write_req_report *report = buf; 494 495 if (data_length > sizeof(report->data)) 496 return -EINVAL; 497 498 report->report = CP2112_DATA_WRITE_REQUEST; 499 report->slave_address = slave_address << 1; 500 report->length = data_length; 501 memcpy(report->data, data, data_length); 502 return data_length + 3; 503 } 504 505 static int cp2112_i2c_write_read_req(void *buf, u8 slave_address, 506 u8 *addr, int addr_length, 507 int read_length) 508 { 509 struct cp2112_write_read_req_report *report = buf; 510 511 if (read_length < 1 || read_length > 512 || 512 addr_length > sizeof(report->target_address)) 513 return -EINVAL; 514 515 report->report = CP2112_DATA_WRITE_READ_REQUEST; 516 report->slave_address = slave_address << 1; 517 report->length = cpu_to_be16(read_length); 518 report->target_address_length = addr_length; 519 memcpy(report->target_address, addr, addr_length); 520 return addr_length + 5; 521 } 522 523 static int cp2112_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, 524 int num) 525 { 526 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; 527 struct hid_device *hdev = dev->hdev; 528 u8 buf[64]; 529 ssize_t count; 530 ssize_t read_length = 0; 531 u8 *read_buf = NULL; 532 unsigned int retries; 533 int ret; 534 535 hid_dbg(hdev, "I2C %d messages\n", num); 536 537 if (num == 1) { 538 if (msgs->flags & I2C_M_RD) { 539 hid_dbg(hdev, "I2C read %#04x len %d\n", 540 msgs->addr, msgs->len); 541 read_length = msgs->len; 542 read_buf = msgs->buf; 543 count = cp2112_read_req(buf, msgs->addr, msgs->len); 544 } else { 545 hid_dbg(hdev, "I2C write %#04x len %d\n", 546 msgs->addr, msgs->len); 547 count = cp2112_i2c_write_req(buf, msgs->addr, 548 msgs->buf, msgs->len); 549 } 550 if (count < 0) 551 return count; 552 } else if (dev->hwversion > 1 && /* no repeated start in rev 1 */ 553 num == 2 && 554 msgs[0].addr == msgs[1].addr && 555 !(msgs[0].flags & I2C_M_RD) && (msgs[1].flags & I2C_M_RD)) { 556 hid_dbg(hdev, "I2C write-read %#04x wlen %d rlen %d\n", 557 msgs[0].addr, msgs[0].len, msgs[1].len); 558 read_length = msgs[1].len; 559 read_buf = msgs[1].buf; 560 count = cp2112_i2c_write_read_req(buf, msgs[0].addr, 561 msgs[0].buf, msgs[0].len, msgs[1].len); 562 if (count < 0) 563 return count; 564 } else { 565 hid_err(hdev, 566 "Multi-message I2C transactions not supported\n"); 567 return -EOPNOTSUPP; 568 } 569 570 ret = hid_hw_power(hdev, PM_HINT_FULLON); 571 if (ret < 0) { 572 hid_err(hdev, "power management error: %d\n", ret); 573 return ret; 574 } 575 576 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); 577 if (ret < 0) { 578 hid_warn(hdev, "Error starting transaction: %d\n", ret); 579 goto power_normal; 580 } 581 582 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { 583 ret = cp2112_xfer_status(dev); 584 if (-EBUSY == ret) 585 continue; 586 if (ret < 0) 587 goto power_normal; 588 break; 589 } 590 591 if (XFER_STATUS_RETRIES <= retries) { 592 hid_warn(hdev, "Transfer timed out, cancelling.\n"); 593 buf[0] = CP2112_CANCEL_TRANSFER; 594 buf[1] = 0x01; 595 596 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); 597 if (ret < 0) 598 hid_warn(hdev, "Error cancelling transaction: %d\n", 599 ret); 600 601 ret = -ETIMEDOUT; 602 goto power_normal; 603 } 604 605 for (count = 0; count < read_length;) { 606 ret = cp2112_read(dev, read_buf + count, read_length - count); 607 if (ret < 0) 608 goto power_normal; 609 if (ret == 0) { 610 hid_err(hdev, "read returned 0\n"); 611 ret = -EIO; 612 goto power_normal; 613 } 614 count += ret; 615 if (count > read_length) { 616 /* 617 * The hardware returned too much data. 618 * This is mostly harmless because cp2112_read() 619 * has a limit check so didn't overrun our 620 * buffer. Nevertheless, we return an error 621 * because something is seriously wrong and 622 * it shouldn't go unnoticed. 623 */ 624 hid_err(hdev, "long read: %d > %zd\n", 625 ret, read_length - count + ret); 626 ret = -EIO; 627 goto power_normal; 628 } 629 } 630 631 /* return the number of transferred messages */ 632 ret = num; 633 634 power_normal: 635 hid_hw_power(hdev, PM_HINT_NORMAL); 636 hid_dbg(hdev, "I2C transfer finished: %d\n", ret); 637 return ret; 638 } 639 640 static int cp2112_xfer(struct i2c_adapter *adap, u16 addr, 641 unsigned short flags, char read_write, u8 command, 642 int size, union i2c_smbus_data *data) 643 { 644 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; 645 struct hid_device *hdev = dev->hdev; 646 u8 buf[64]; 647 __le16 word; 648 ssize_t count; 649 size_t read_length = 0; 650 unsigned int retries; 651 int ret; 652 653 hid_dbg(hdev, "%s addr 0x%x flags 0x%x cmd 0x%x size %d\n", 654 read_write == I2C_SMBUS_WRITE ? "write" : "read", 655 addr, flags, command, size); 656 657 switch (size) { 658 case I2C_SMBUS_BYTE: 659 read_length = 1; 660 661 if (I2C_SMBUS_READ == read_write) 662 count = cp2112_read_req(buf, addr, read_length); 663 else 664 count = cp2112_write_req(buf, addr, command, NULL, 665 0); 666 break; 667 case I2C_SMBUS_BYTE_DATA: 668 read_length = 1; 669 670 if (I2C_SMBUS_READ == read_write) 671 count = cp2112_write_read_req(buf, addr, read_length, 672 command, NULL, 0); 673 else 674 count = cp2112_write_req(buf, addr, command, 675 &data->byte, 1); 676 break; 677 case I2C_SMBUS_WORD_DATA: 678 read_length = 2; 679 word = cpu_to_le16(data->word); 680 681 if (I2C_SMBUS_READ == read_write) 682 count = cp2112_write_read_req(buf, addr, read_length, 683 command, NULL, 0); 684 else 685 count = cp2112_write_req(buf, addr, command, 686 (u8 *)&word, 2); 687 break; 688 case I2C_SMBUS_PROC_CALL: 689 size = I2C_SMBUS_WORD_DATA; 690 read_write = I2C_SMBUS_READ; 691 read_length = 2; 692 word = cpu_to_le16(data->word); 693 694 count = cp2112_write_read_req(buf, addr, read_length, command, 695 (u8 *)&word, 2); 696 break; 697 case I2C_SMBUS_I2C_BLOCK_DATA: 698 size = I2C_SMBUS_BLOCK_DATA; 699 /* fallthrough */ 700 case I2C_SMBUS_BLOCK_DATA: 701 if (I2C_SMBUS_READ == read_write) { 702 count = cp2112_write_read_req(buf, addr, 703 I2C_SMBUS_BLOCK_MAX, 704 command, NULL, 0); 705 } else { 706 count = cp2112_write_req(buf, addr, command, 707 data->block, 708 data->block[0] + 1); 709 } 710 break; 711 case I2C_SMBUS_BLOCK_PROC_CALL: 712 size = I2C_SMBUS_BLOCK_DATA; 713 read_write = I2C_SMBUS_READ; 714 715 count = cp2112_write_read_req(buf, addr, I2C_SMBUS_BLOCK_MAX, 716 command, data->block, 717 data->block[0] + 1); 718 break; 719 default: 720 hid_warn(hdev, "Unsupported transaction %d\n", size); 721 return -EOPNOTSUPP; 722 } 723 724 if (count < 0) 725 return count; 726 727 ret = hid_hw_power(hdev, PM_HINT_FULLON); 728 if (ret < 0) { 729 hid_err(hdev, "power management error: %d\n", ret); 730 return ret; 731 } 732 733 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); 734 if (ret < 0) { 735 hid_warn(hdev, "Error starting transaction: %d\n", ret); 736 goto power_normal; 737 } 738 739 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { 740 ret = cp2112_xfer_status(dev); 741 if (-EBUSY == ret) 742 continue; 743 if (ret < 0) 744 goto power_normal; 745 break; 746 } 747 748 if (XFER_STATUS_RETRIES <= retries) { 749 hid_warn(hdev, "Transfer timed out, cancelling.\n"); 750 buf[0] = CP2112_CANCEL_TRANSFER; 751 buf[1] = 0x01; 752 753 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); 754 if (ret < 0) 755 hid_warn(hdev, "Error cancelling transaction: %d\n", 756 ret); 757 758 ret = -ETIMEDOUT; 759 goto power_normal; 760 } 761 762 if (I2C_SMBUS_WRITE == read_write) { 763 ret = 0; 764 goto power_normal; 765 } 766 767 if (I2C_SMBUS_BLOCK_DATA == size) 768 read_length = ret; 769 770 ret = cp2112_read(dev, buf, read_length); 771 if (ret < 0) 772 goto power_normal; 773 if (ret != read_length) { 774 hid_warn(hdev, "short read: %d < %zd\n", ret, read_length); 775 ret = -EIO; 776 goto power_normal; 777 } 778 779 switch (size) { 780 case I2C_SMBUS_BYTE: 781 case I2C_SMBUS_BYTE_DATA: 782 data->byte = buf[0]; 783 break; 784 case I2C_SMBUS_WORD_DATA: 785 data->word = le16_to_cpup((__le16 *)buf); 786 break; 787 case I2C_SMBUS_BLOCK_DATA: 788 if (read_length > I2C_SMBUS_BLOCK_MAX) { 789 ret = -EPROTO; 790 goto power_normal; 791 } 792 793 memcpy(data->block, buf, read_length); 794 break; 795 } 796 797 ret = 0; 798 power_normal: 799 hid_hw_power(hdev, PM_HINT_NORMAL); 800 hid_dbg(hdev, "transfer finished: %d\n", ret); 801 return ret; 802 } 803 804 static u32 cp2112_functionality(struct i2c_adapter *adap) 805 { 806 return I2C_FUNC_I2C | 807 I2C_FUNC_SMBUS_BYTE | 808 I2C_FUNC_SMBUS_BYTE_DATA | 809 I2C_FUNC_SMBUS_WORD_DATA | 810 I2C_FUNC_SMBUS_BLOCK_DATA | 811 I2C_FUNC_SMBUS_I2C_BLOCK | 812 I2C_FUNC_SMBUS_PROC_CALL | 813 I2C_FUNC_SMBUS_BLOCK_PROC_CALL; 814 } 815 816 static const struct i2c_algorithm smbus_algorithm = { 817 .master_xfer = cp2112_i2c_xfer, 818 .smbus_xfer = cp2112_xfer, 819 .functionality = cp2112_functionality, 820 }; 821 822 static int cp2112_get_usb_config(struct hid_device *hdev, 823 struct cp2112_usb_config_report *cfg) 824 { 825 int ret; 826 827 ret = cp2112_hid_get(hdev, CP2112_USB_CONFIG, (u8 *)cfg, sizeof(*cfg), 828 HID_FEATURE_REPORT); 829 if (ret != sizeof(*cfg)) { 830 hid_err(hdev, "error reading usb config: %d\n", ret); 831 if (ret < 0) 832 return ret; 833 return -EIO; 834 } 835 836 return 0; 837 } 838 839 static int cp2112_set_usb_config(struct hid_device *hdev, 840 struct cp2112_usb_config_report *cfg) 841 { 842 int ret; 843 844 BUG_ON(cfg->report != CP2112_USB_CONFIG); 845 846 ret = cp2112_hid_output(hdev, (u8 *)cfg, sizeof(*cfg), 847 HID_FEATURE_REPORT); 848 if (ret != sizeof(*cfg)) { 849 hid_err(hdev, "error writing usb config: %d\n", ret); 850 if (ret < 0) 851 return ret; 852 return -EIO; 853 } 854 855 return 0; 856 } 857 858 static void chmod_sysfs_attrs(struct hid_device *hdev); 859 860 #define CP2112_CONFIG_ATTR(name, store, format, ...) \ 861 static ssize_t name##_store(struct device *kdev, \ 862 struct device_attribute *attr, const char *buf, \ 863 size_t count) \ 864 { \ 865 struct hid_device *hdev = to_hid_device(kdev); \ 866 struct cp2112_usb_config_report cfg; \ 867 int ret = cp2112_get_usb_config(hdev, &cfg); \ 868 if (ret) \ 869 return ret; \ 870 store; \ 871 ret = cp2112_set_usb_config(hdev, &cfg); \ 872 if (ret) \ 873 return ret; \ 874 chmod_sysfs_attrs(hdev); \ 875 return count; \ 876 } \ 877 static ssize_t name##_show(struct device *kdev, \ 878 struct device_attribute *attr, char *buf) \ 879 { \ 880 struct hid_device *hdev = to_hid_device(kdev); \ 881 struct cp2112_usb_config_report cfg; \ 882 int ret = cp2112_get_usb_config(hdev, &cfg); \ 883 if (ret) \ 884 return ret; \ 885 return scnprintf(buf, PAGE_SIZE, format, ##__VA_ARGS__); \ 886 } \ 887 static DEVICE_ATTR_RW(name); 888 889 CP2112_CONFIG_ATTR(vendor_id, ({ 890 u16 vid; 891 892 if (sscanf(buf, "%hi", &vid) != 1) 893 return -EINVAL; 894 895 cfg.vid = cpu_to_le16(vid); 896 cfg.mask = 0x01; 897 }), "0x%04x\n", le16_to_cpu(cfg.vid)); 898 899 CP2112_CONFIG_ATTR(product_id, ({ 900 u16 pid; 901 902 if (sscanf(buf, "%hi", &pid) != 1) 903 return -EINVAL; 904 905 cfg.pid = cpu_to_le16(pid); 906 cfg.mask = 0x02; 907 }), "0x%04x\n", le16_to_cpu(cfg.pid)); 908 909 CP2112_CONFIG_ATTR(max_power, ({ 910 int mA; 911 912 if (sscanf(buf, "%i", &mA) != 1) 913 return -EINVAL; 914 915 cfg.max_power = (mA + 1) / 2; 916 cfg.mask = 0x04; 917 }), "%u mA\n", cfg.max_power * 2); 918 919 CP2112_CONFIG_ATTR(power_mode, ({ 920 if (sscanf(buf, "%hhi", &cfg.power_mode) != 1) 921 return -EINVAL; 922 923 cfg.mask = 0x08; 924 }), "%u\n", cfg.power_mode); 925 926 CP2112_CONFIG_ATTR(release_version, ({ 927 if (sscanf(buf, "%hhi.%hhi", &cfg.release_major, &cfg.release_minor) 928 != 2) 929 return -EINVAL; 930 931 cfg.mask = 0x10; 932 }), "%u.%u\n", cfg.release_major, cfg.release_minor); 933 934 #undef CP2112_CONFIG_ATTR 935 936 struct cp2112_pstring_attribute { 937 struct device_attribute attr; 938 unsigned char report; 939 }; 940 941 static ssize_t pstr_store(struct device *kdev, 942 struct device_attribute *kattr, const char *buf, 943 size_t count) 944 { 945 struct hid_device *hdev = to_hid_device(kdev); 946 struct cp2112_pstring_attribute *attr = 947 container_of(kattr, struct cp2112_pstring_attribute, attr); 948 struct cp2112_string_report report; 949 int ret; 950 951 memset(&report, 0, sizeof(report)); 952 953 ret = utf8s_to_utf16s(buf, count, UTF16_LITTLE_ENDIAN, 954 report.string, ARRAY_SIZE(report.string)); 955 report.report = attr->report; 956 report.length = ret * sizeof(report.string[0]) + 2; 957 report.type = USB_DT_STRING; 958 959 ret = cp2112_hid_output(hdev, &report.report, report.length + 1, 960 HID_FEATURE_REPORT); 961 if (ret != report.length + 1) { 962 hid_err(hdev, "error writing %s string: %d\n", kattr->attr.name, 963 ret); 964 if (ret < 0) 965 return ret; 966 return -EIO; 967 } 968 969 chmod_sysfs_attrs(hdev); 970 return count; 971 } 972 973 static ssize_t pstr_show(struct device *kdev, 974 struct device_attribute *kattr, char *buf) 975 { 976 struct hid_device *hdev = to_hid_device(kdev); 977 struct cp2112_pstring_attribute *attr = 978 container_of(kattr, struct cp2112_pstring_attribute, attr); 979 struct cp2112_string_report report; 980 u8 length; 981 int ret; 982 983 ret = cp2112_hid_get(hdev, attr->report, &report.report, 984 sizeof(report) - 1, HID_FEATURE_REPORT); 985 if (ret < 3) { 986 hid_err(hdev, "error reading %s string: %d\n", kattr->attr.name, 987 ret); 988 if (ret < 0) 989 return ret; 990 return -EIO; 991 } 992 993 if (report.length < 2) { 994 hid_err(hdev, "invalid %s string length: %d\n", 995 kattr->attr.name, report.length); 996 return -EIO; 997 } 998 999 length = report.length > ret - 1 ? ret - 1 : report.length; 1000 length = (length - 2) / sizeof(report.string[0]); 1001 ret = utf16s_to_utf8s(report.string, length, UTF16_LITTLE_ENDIAN, buf, 1002 PAGE_SIZE - 1); 1003 buf[ret++] = '\n'; 1004 return ret; 1005 } 1006 1007 #define CP2112_PSTR_ATTR(name, _report) \ 1008 static struct cp2112_pstring_attribute dev_attr_##name = { \ 1009 .attr = __ATTR(name, (S_IWUSR | S_IRUGO), pstr_show, pstr_store), \ 1010 .report = _report, \ 1011 }; 1012 1013 CP2112_PSTR_ATTR(manufacturer, CP2112_MANUFACTURER_STRING); 1014 CP2112_PSTR_ATTR(product, CP2112_PRODUCT_STRING); 1015 CP2112_PSTR_ATTR(serial, CP2112_SERIAL_STRING); 1016 1017 #undef CP2112_PSTR_ATTR 1018 1019 static const struct attribute_group cp2112_attr_group = { 1020 .attrs = (struct attribute *[]){ 1021 &dev_attr_vendor_id.attr, 1022 &dev_attr_product_id.attr, 1023 &dev_attr_max_power.attr, 1024 &dev_attr_power_mode.attr, 1025 &dev_attr_release_version.attr, 1026 &dev_attr_manufacturer.attr.attr, 1027 &dev_attr_product.attr.attr, 1028 &dev_attr_serial.attr.attr, 1029 NULL 1030 } 1031 }; 1032 1033 /* Chmoding our sysfs attributes is simply a way to expose which fields in the 1034 * PROM have already been programmed. We do not depend on this preventing 1035 * writing to these attributes since the CP2112 will simply ignore writes to 1036 * already-programmed fields. This is why there is no sense in fixing this 1037 * racy behaviour. 1038 */ 1039 static void chmod_sysfs_attrs(struct hid_device *hdev) 1040 { 1041 struct attribute **attr; 1042 u8 buf[2]; 1043 int ret; 1044 1045 ret = cp2112_hid_get(hdev, CP2112_LOCK_BYTE, buf, sizeof(buf), 1046 HID_FEATURE_REPORT); 1047 if (ret != sizeof(buf)) { 1048 hid_err(hdev, "error reading lock byte: %d\n", ret); 1049 return; 1050 } 1051 1052 for (attr = cp2112_attr_group.attrs; *attr; ++attr) { 1053 umode_t mode = (buf[1] & 1) ? S_IWUSR | S_IRUGO : S_IRUGO; 1054 ret = sysfs_chmod_file(&hdev->dev.kobj, *attr, mode); 1055 if (ret < 0) 1056 hid_err(hdev, "error chmoding sysfs file %s\n", 1057 (*attr)->name); 1058 buf[1] >>= 1; 1059 } 1060 } 1061 1062 static void cp2112_gpio_irq_ack(struct irq_data *d) 1063 { 1064 } 1065 1066 static void cp2112_gpio_irq_mask(struct irq_data *d) 1067 { 1068 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1069 struct cp2112_device *dev = gpiochip_get_data(gc); 1070 1071 __clear_bit(d->hwirq, &dev->irq_mask); 1072 } 1073 1074 static void cp2112_gpio_irq_unmask(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 __set_bit(d->hwirq, &dev->irq_mask); 1080 } 1081 1082 static void cp2112_gpio_poll_callback(struct work_struct *work) 1083 { 1084 struct cp2112_device *dev = container_of(work, struct cp2112_device, 1085 gpio_poll_worker.work); 1086 struct irq_data *d; 1087 u8 gpio_mask; 1088 u8 virqs = (u8)dev->irq_mask; 1089 u32 irq_type; 1090 int irq, virq, ret; 1091 1092 ret = cp2112_gpio_get_all(&dev->gc); 1093 if (ret == -ENODEV) /* the hardware has been disconnected */ 1094 return; 1095 if (ret < 0) 1096 goto exit; 1097 1098 gpio_mask = ret; 1099 1100 while (virqs) { 1101 virq = ffs(virqs) - 1; 1102 virqs &= ~BIT(virq); 1103 1104 if (!dev->gc.to_irq) 1105 break; 1106 1107 irq = dev->gc.to_irq(&dev->gc, virq); 1108 1109 d = irq_get_irq_data(irq); 1110 if (!d) 1111 continue; 1112 1113 irq_type = irqd_get_trigger_type(d); 1114 1115 if (gpio_mask & BIT(virq)) { 1116 /* Level High */ 1117 1118 if (irq_type & IRQ_TYPE_LEVEL_HIGH) 1119 handle_nested_irq(irq); 1120 1121 if ((irq_type & IRQ_TYPE_EDGE_RISING) && 1122 !(dev->gpio_prev_state & BIT(virq))) 1123 handle_nested_irq(irq); 1124 } else { 1125 /* Level Low */ 1126 1127 if (irq_type & IRQ_TYPE_LEVEL_LOW) 1128 handle_nested_irq(irq); 1129 1130 if ((irq_type & IRQ_TYPE_EDGE_FALLING) && 1131 (dev->gpio_prev_state & BIT(virq))) 1132 handle_nested_irq(irq); 1133 } 1134 } 1135 1136 dev->gpio_prev_state = gpio_mask; 1137 1138 exit: 1139 if (dev->gpio_poll) 1140 schedule_delayed_work(&dev->gpio_poll_worker, 10); 1141 } 1142 1143 1144 static unsigned int cp2112_gpio_irq_startup(struct irq_data *d) 1145 { 1146 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1147 struct cp2112_device *dev = gpiochip_get_data(gc); 1148 1149 INIT_DELAYED_WORK(&dev->gpio_poll_worker, cp2112_gpio_poll_callback); 1150 1151 cp2112_gpio_direction_input(gc, d->hwirq); 1152 1153 if (!dev->gpio_poll) { 1154 dev->gpio_poll = true; 1155 schedule_delayed_work(&dev->gpio_poll_worker, 0); 1156 } 1157 1158 cp2112_gpio_irq_unmask(d); 1159 return 0; 1160 } 1161 1162 static void cp2112_gpio_irq_shutdown(struct irq_data *d) 1163 { 1164 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1165 struct cp2112_device *dev = gpiochip_get_data(gc); 1166 1167 cancel_delayed_work_sync(&dev->gpio_poll_worker); 1168 } 1169 1170 static int cp2112_gpio_irq_type(struct irq_data *d, unsigned int type) 1171 { 1172 return 0; 1173 } 1174 1175 static struct irq_chip cp2112_gpio_irqchip = { 1176 .name = "cp2112-gpio", 1177 .irq_startup = cp2112_gpio_irq_startup, 1178 .irq_shutdown = cp2112_gpio_irq_shutdown, 1179 .irq_ack = cp2112_gpio_irq_ack, 1180 .irq_mask = cp2112_gpio_irq_mask, 1181 .irq_unmask = cp2112_gpio_irq_unmask, 1182 .irq_set_type = cp2112_gpio_irq_type, 1183 }; 1184 1185 static int __maybe_unused cp2112_allocate_irq(struct cp2112_device *dev, 1186 int pin) 1187 { 1188 int ret; 1189 1190 if (dev->desc[pin]) 1191 return -EINVAL; 1192 1193 dev->desc[pin] = gpiochip_request_own_desc(&dev->gc, pin, 1194 "HID/I2C:Event"); 1195 if (IS_ERR(dev->desc[pin])) { 1196 dev_err(dev->gc.parent, "Failed to request GPIO\n"); 1197 return PTR_ERR(dev->desc[pin]); 1198 } 1199 1200 ret = gpiochip_lock_as_irq(&dev->gc, pin); 1201 if (ret) { 1202 dev_err(dev->gc.parent, "Failed to lock GPIO as interrupt\n"); 1203 goto err_desc; 1204 } 1205 1206 ret = gpiod_to_irq(dev->desc[pin]); 1207 if (ret < 0) { 1208 dev_err(dev->gc.parent, "Failed to translate GPIO to IRQ\n"); 1209 goto err_lock; 1210 } 1211 1212 return ret; 1213 1214 err_lock: 1215 gpiochip_unlock_as_irq(&dev->gc, pin); 1216 err_desc: 1217 gpiochip_free_own_desc(dev->desc[pin]); 1218 dev->desc[pin] = NULL; 1219 return ret; 1220 } 1221 1222 static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id) 1223 { 1224 struct cp2112_device *dev; 1225 u8 buf[3]; 1226 struct cp2112_smbus_config_report config; 1227 int ret; 1228 1229 dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL); 1230 if (!dev) 1231 return -ENOMEM; 1232 1233 dev->in_out_buffer = devm_kzalloc(&hdev->dev, CP2112_REPORT_MAX_LENGTH, 1234 GFP_KERNEL); 1235 if (!dev->in_out_buffer) 1236 return -ENOMEM; 1237 1238 spin_lock_init(&dev->lock); 1239 1240 ret = hid_parse(hdev); 1241 if (ret) { 1242 hid_err(hdev, "parse failed\n"); 1243 return ret; 1244 } 1245 1246 ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW); 1247 if (ret) { 1248 hid_err(hdev, "hw start failed\n"); 1249 return ret; 1250 } 1251 1252 ret = hid_hw_open(hdev); 1253 if (ret) { 1254 hid_err(hdev, "hw open failed\n"); 1255 goto err_hid_stop; 1256 } 1257 1258 ret = hid_hw_power(hdev, PM_HINT_FULLON); 1259 if (ret < 0) { 1260 hid_err(hdev, "power management error: %d\n", ret); 1261 goto err_hid_close; 1262 } 1263 1264 ret = cp2112_hid_get(hdev, CP2112_GET_VERSION_INFO, buf, sizeof(buf), 1265 HID_FEATURE_REPORT); 1266 if (ret != sizeof(buf)) { 1267 hid_err(hdev, "error requesting version\n"); 1268 if (ret >= 0) 1269 ret = -EIO; 1270 goto err_power_normal; 1271 } 1272 1273 hid_info(hdev, "Part Number: 0x%02X Device Version: 0x%02X\n", 1274 buf[1], buf[2]); 1275 1276 ret = cp2112_hid_get(hdev, CP2112_SMBUS_CONFIG, (u8 *)&config, 1277 sizeof(config), HID_FEATURE_REPORT); 1278 if (ret != sizeof(config)) { 1279 hid_err(hdev, "error requesting SMBus config\n"); 1280 if (ret >= 0) 1281 ret = -EIO; 1282 goto err_power_normal; 1283 } 1284 1285 config.retry_time = cpu_to_be16(1); 1286 1287 ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config), 1288 HID_FEATURE_REPORT); 1289 if (ret != sizeof(config)) { 1290 hid_err(hdev, "error setting SMBus config\n"); 1291 if (ret >= 0) 1292 ret = -EIO; 1293 goto err_power_normal; 1294 } 1295 1296 hid_set_drvdata(hdev, (void *)dev); 1297 dev->hdev = hdev; 1298 dev->adap.owner = THIS_MODULE; 1299 dev->adap.class = I2C_CLASS_HWMON; 1300 dev->adap.algo = &smbus_algorithm; 1301 dev->adap.algo_data = dev; 1302 dev->adap.dev.parent = &hdev->dev; 1303 snprintf(dev->adap.name, sizeof(dev->adap.name), 1304 "CP2112 SMBus Bridge on hiddev%d", hdev->minor); 1305 dev->hwversion = buf[2]; 1306 init_waitqueue_head(&dev->wait); 1307 1308 hid_device_io_start(hdev); 1309 ret = i2c_add_adapter(&dev->adap); 1310 hid_device_io_stop(hdev); 1311 1312 if (ret) { 1313 hid_err(hdev, "error registering i2c adapter\n"); 1314 goto err_power_normal; 1315 } 1316 1317 hid_dbg(hdev, "adapter registered\n"); 1318 1319 dev->gc.label = "cp2112_gpio"; 1320 dev->gc.direction_input = cp2112_gpio_direction_input; 1321 dev->gc.direction_output = cp2112_gpio_direction_output; 1322 dev->gc.set = cp2112_gpio_set; 1323 dev->gc.get = cp2112_gpio_get; 1324 dev->gc.base = -1; 1325 dev->gc.ngpio = 8; 1326 dev->gc.can_sleep = 1; 1327 dev->gc.parent = &hdev->dev; 1328 1329 ret = gpiochip_add_data(&dev->gc, dev); 1330 if (ret < 0) { 1331 hid_err(hdev, "error registering gpio chip\n"); 1332 goto err_free_i2c; 1333 } 1334 1335 ret = sysfs_create_group(&hdev->dev.kobj, &cp2112_attr_group); 1336 if (ret < 0) { 1337 hid_err(hdev, "error creating sysfs attrs\n"); 1338 goto err_gpiochip_remove; 1339 } 1340 1341 chmod_sysfs_attrs(hdev); 1342 hid_hw_power(hdev, PM_HINT_NORMAL); 1343 1344 ret = gpiochip_irqchip_add(&dev->gc, &cp2112_gpio_irqchip, 0, 1345 handle_simple_irq, IRQ_TYPE_NONE); 1346 if (ret) { 1347 dev_err(dev->gc.parent, "failed to add IRQ chip\n"); 1348 goto err_sysfs_remove; 1349 } 1350 1351 return ret; 1352 1353 err_sysfs_remove: 1354 sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group); 1355 err_gpiochip_remove: 1356 gpiochip_remove(&dev->gc); 1357 err_free_i2c: 1358 i2c_del_adapter(&dev->adap); 1359 err_power_normal: 1360 hid_hw_power(hdev, PM_HINT_NORMAL); 1361 err_hid_close: 1362 hid_hw_close(hdev); 1363 err_hid_stop: 1364 hid_hw_stop(hdev); 1365 return ret; 1366 } 1367 1368 static void cp2112_remove(struct hid_device *hdev) 1369 { 1370 struct cp2112_device *dev = hid_get_drvdata(hdev); 1371 int i; 1372 1373 sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group); 1374 i2c_del_adapter(&dev->adap); 1375 1376 if (dev->gpio_poll) { 1377 dev->gpio_poll = false; 1378 cancel_delayed_work_sync(&dev->gpio_poll_worker); 1379 } 1380 1381 for (i = 0; i < ARRAY_SIZE(dev->desc); i++) { 1382 gpiochip_unlock_as_irq(&dev->gc, i); 1383 gpiochip_free_own_desc(dev->desc[i]); 1384 } 1385 1386 gpiochip_remove(&dev->gc); 1387 /* i2c_del_adapter has finished removing all i2c devices from our 1388 * adapter. Well behaved devices should no longer call our cp2112_xfer 1389 * and should have waited for any pending calls to finish. It has also 1390 * waited for device_unregister(&adap->dev) to complete. Therefore we 1391 * can safely free our struct cp2112_device. 1392 */ 1393 hid_hw_close(hdev); 1394 hid_hw_stop(hdev); 1395 } 1396 1397 static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report, 1398 u8 *data, int size) 1399 { 1400 struct cp2112_device *dev = hid_get_drvdata(hdev); 1401 struct cp2112_xfer_status_report *xfer = (void *)data; 1402 1403 switch (data[0]) { 1404 case CP2112_TRANSFER_STATUS_RESPONSE: 1405 hid_dbg(hdev, "xfer status: %02x %02x %04x %04x\n", 1406 xfer->status0, xfer->status1, 1407 be16_to_cpu(xfer->retries), be16_to_cpu(xfer->length)); 1408 1409 switch (xfer->status0) { 1410 case STATUS0_IDLE: 1411 dev->xfer_status = -EAGAIN; 1412 break; 1413 case STATUS0_BUSY: 1414 dev->xfer_status = -EBUSY; 1415 break; 1416 case STATUS0_COMPLETE: 1417 dev->xfer_status = be16_to_cpu(xfer->length); 1418 break; 1419 case STATUS0_ERROR: 1420 switch (xfer->status1) { 1421 case STATUS1_TIMEOUT_NACK: 1422 case STATUS1_TIMEOUT_BUS: 1423 dev->xfer_status = -ETIMEDOUT; 1424 break; 1425 default: 1426 dev->xfer_status = -EIO; 1427 break; 1428 } 1429 break; 1430 default: 1431 dev->xfer_status = -EINVAL; 1432 break; 1433 } 1434 1435 atomic_set(&dev->xfer_avail, 1); 1436 break; 1437 case CP2112_DATA_READ_RESPONSE: 1438 hid_dbg(hdev, "read response: %02x %02x\n", data[1], data[2]); 1439 1440 dev->read_length = data[2]; 1441 if (dev->read_length > sizeof(dev->read_data)) 1442 dev->read_length = sizeof(dev->read_data); 1443 1444 memcpy(dev->read_data, &data[3], dev->read_length); 1445 atomic_set(&dev->read_avail, 1); 1446 break; 1447 default: 1448 hid_err(hdev, "unknown report\n"); 1449 1450 return 0; 1451 } 1452 1453 wake_up_interruptible(&dev->wait); 1454 return 1; 1455 } 1456 1457 static struct hid_driver cp2112_driver = { 1458 .name = "cp2112", 1459 .id_table = cp2112_devices, 1460 .probe = cp2112_probe, 1461 .remove = cp2112_remove, 1462 .raw_event = cp2112_raw_event, 1463 }; 1464 1465 module_hid_driver(cp2112_driver); 1466 MODULE_DESCRIPTION("Silicon Labs HID USB to SMBus master bridge"); 1467 MODULE_AUTHOR("David Barksdale <dbarksdale@uplogix.com>"); 1468 MODULE_LICENSE("GPL"); 1469 1470