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/bitops.h> 20 #include <linux/cleanup.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/mutex.h> 27 #include <linux/nls.h> 28 #include <linux/string_choices.h> 29 #include <linux/usb/ch9.h> 30 #include "hid-ids.h" 31 32 /** 33 * enum cp2112_child_acpi_cell_addrs - Child ACPI addresses for CP2112 sub-functions 34 * Note that the enum values are explicitly defined, as this defines the interface 35 * between ACPI and Linux 36 * @CP2112_I2C_ADR: Address for I2C node 37 * @CP2112_GPIO_ADR: Address for GPIO node 38 */ 39 enum cp2112_child_acpi_cell_addrs { 40 CP2112_I2C_ADR = 0, 41 CP2112_GPIO_ADR = 1, 42 }; 43 44 #define CP2112_REPORT_MAX_LENGTH 64 45 #define CP2112_GPIO_CONFIG_LENGTH 5 46 #define CP2112_GPIO_GET_LENGTH 2 47 #define CP2112_GPIO_SET_LENGTH 3 48 #define CP2112_GPIO_MAX_GPIO 8 49 #define CP2112_GPIO_ALL_GPIO_MASK GENMASK(7, 0) 50 51 enum { 52 CP2112_GPIO_CONFIG = 0x02, 53 CP2112_GPIO_GET = 0x03, 54 CP2112_GPIO_SET = 0x04, 55 CP2112_GET_VERSION_INFO = 0x05, 56 CP2112_SMBUS_CONFIG = 0x06, 57 CP2112_DATA_READ_REQUEST = 0x10, 58 CP2112_DATA_WRITE_READ_REQUEST = 0x11, 59 CP2112_DATA_READ_FORCE_SEND = 0x12, 60 CP2112_DATA_READ_RESPONSE = 0x13, 61 CP2112_DATA_WRITE_REQUEST = 0x14, 62 CP2112_TRANSFER_STATUS_REQUEST = 0x15, 63 CP2112_TRANSFER_STATUS_RESPONSE = 0x16, 64 CP2112_CANCEL_TRANSFER = 0x17, 65 CP2112_LOCK_BYTE = 0x20, 66 CP2112_USB_CONFIG = 0x21, 67 CP2112_MANUFACTURER_STRING = 0x22, 68 CP2112_PRODUCT_STRING = 0x23, 69 CP2112_SERIAL_STRING = 0x24, 70 }; 71 72 enum { 73 STATUS0_IDLE = 0x00, 74 STATUS0_BUSY = 0x01, 75 STATUS0_COMPLETE = 0x02, 76 STATUS0_ERROR = 0x03, 77 }; 78 79 enum { 80 STATUS1_TIMEOUT_NACK = 0x00, 81 STATUS1_TIMEOUT_BUS = 0x01, 82 STATUS1_ARBITRATION_LOST = 0x02, 83 STATUS1_READ_INCOMPLETE = 0x03, 84 STATUS1_WRITE_INCOMPLETE = 0x04, 85 STATUS1_SUCCESS = 0x05, 86 }; 87 88 struct cp2112_smbus_config_report { 89 u8 report; /* CP2112_SMBUS_CONFIG */ 90 __be32 clock_speed; /* Hz */ 91 u8 device_address; /* Stored in the upper 7 bits */ 92 u8 auto_send_read; /* 1 = enabled, 0 = disabled */ 93 __be16 write_timeout; /* ms, 0 = no timeout */ 94 __be16 read_timeout; /* ms, 0 = no timeout */ 95 u8 scl_low_timeout; /* 1 = enabled, 0 = disabled */ 96 __be16 retry_time; /* # of retries, 0 = no limit */ 97 } __packed; 98 99 struct cp2112_usb_config_report { 100 u8 report; /* CP2112_USB_CONFIG */ 101 __le16 vid; /* Vendor ID */ 102 __le16 pid; /* Product ID */ 103 u8 max_power; /* Power requested in 2mA units */ 104 u8 power_mode; /* 0x00 = bus powered 105 0x01 = self powered & regulator off 106 0x02 = self powered & regulator on */ 107 u8 release_major; 108 u8 release_minor; 109 u8 mask; /* What fields to program */ 110 } __packed; 111 112 struct cp2112_read_req_report { 113 u8 report; /* CP2112_DATA_READ_REQUEST */ 114 u8 slave_address; 115 __be16 length; 116 } __packed; 117 118 struct cp2112_write_read_req_report { 119 u8 report; /* CP2112_DATA_WRITE_READ_REQUEST */ 120 u8 slave_address; 121 __be16 length; 122 u8 target_address_length; 123 u8 target_address[16]; 124 } __packed; 125 126 struct cp2112_write_req_report { 127 u8 report; /* CP2112_DATA_WRITE_REQUEST */ 128 u8 slave_address; 129 u8 length; 130 u8 data[61]; 131 } __packed; 132 133 struct cp2112_force_read_report { 134 u8 report; /* CP2112_DATA_READ_FORCE_SEND */ 135 __be16 length; 136 } __packed; 137 138 struct cp2112_xfer_status_report { 139 u8 report; /* CP2112_TRANSFER_STATUS_RESPONSE */ 140 u8 status0; /* STATUS0_* */ 141 u8 status1; /* STATUS1_* */ 142 __be16 retries; 143 __be16 length; 144 } __packed; 145 146 struct cp2112_string_report { 147 u8 dummy; /* force .string to be aligned */ 148 struct_group_attr(contents, __packed, 149 u8 report; /* CP2112_*_STRING */ 150 u8 length; /* length in bytes of everything after .report */ 151 u8 type; /* USB_DT_STRING */ 152 wchar_t string[30]; /* UTF16_LITTLE_ENDIAN string */ 153 ); 154 } __packed; 155 156 /* Number of times to request transfer status before giving up waiting for a 157 transfer to complete. This may need to be changed if SMBUS clock, retries, 158 or read/write/scl_low timeout settings are changed. */ 159 static const int XFER_STATUS_RETRIES = 10; 160 161 /* Time in ms to wait for a CP2112_DATA_READ_RESPONSE or 162 CP2112_TRANSFER_STATUS_RESPONSE. */ 163 static const int RESPONSE_TIMEOUT = 50; 164 165 static const struct hid_device_id cp2112_devices[] = { 166 { HID_USB_DEVICE(USB_VENDOR_ID_CYGNAL, USB_DEVICE_ID_CYGNAL_CP2112) }, 167 { } 168 }; 169 MODULE_DEVICE_TABLE(hid, cp2112_devices); 170 171 struct cp2112_device { 172 struct i2c_adapter adap; 173 struct hid_device *hdev; 174 wait_queue_head_t wait; 175 u8 read_data[61]; 176 u8 read_length; 177 u8 hwversion; 178 int xfer_status; 179 atomic_t read_avail; 180 atomic_t xfer_avail; 181 struct gpio_chip gc; 182 u8 *in_out_buffer; 183 struct mutex lock; 184 185 bool gpio_poll; 186 struct delayed_work gpio_poll_worker; 187 unsigned long irq_mask; 188 u8 gpio_prev_state; 189 }; 190 191 static int gpio_push_pull = CP2112_GPIO_ALL_GPIO_MASK; 192 module_param(gpio_push_pull, int, 0644); 193 MODULE_PARM_DESC(gpio_push_pull, "GPIO push-pull configuration bitmask"); 194 195 static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset) 196 { 197 struct cp2112_device *dev = gpiochip_get_data(chip); 198 struct hid_device *hdev = dev->hdev; 199 u8 *buf = dev->in_out_buffer; 200 int ret; 201 202 guard(mutex)(&dev->lock); 203 204 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, 205 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, 206 HID_REQ_GET_REPORT); 207 if (ret != CP2112_GPIO_CONFIG_LENGTH) { 208 hid_err(hdev, "error requesting GPIO config: %d\n", ret); 209 if (ret >= 0) 210 ret = -EIO; 211 return ret; 212 } 213 214 buf[1] &= ~BIT(offset); 215 buf[2] = gpio_push_pull; 216 217 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, 218 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, 219 HID_REQ_SET_REPORT); 220 if (ret != CP2112_GPIO_CONFIG_LENGTH) { 221 hid_err(hdev, "error setting GPIO config: %d\n", ret); 222 if (ret >= 0) 223 ret = -EIO; 224 return ret; 225 } 226 227 return 0; 228 } 229 230 static int cp2112_gpio_set_unlocked(struct cp2112_device *dev, 231 unsigned int offset, int value) 232 { 233 struct hid_device *hdev = dev->hdev; 234 u8 *buf = dev->in_out_buffer; 235 int ret; 236 237 buf[0] = CP2112_GPIO_SET; 238 buf[1] = value ? CP2112_GPIO_ALL_GPIO_MASK : 0; 239 buf[2] = BIT(offset); 240 241 ret = hid_hw_raw_request(hdev, CP2112_GPIO_SET, buf, 242 CP2112_GPIO_SET_LENGTH, HID_FEATURE_REPORT, 243 HID_REQ_SET_REPORT); 244 if (ret != CP2112_GPIO_SET_LENGTH) { 245 hid_err(hdev, "error setting GPIO values: %d\n", ret); 246 return ret < 0 ? ret : -EIO; 247 } 248 249 return 0; 250 } 251 252 static int cp2112_gpio_set(struct gpio_chip *chip, unsigned int offset, 253 int value) 254 { 255 struct cp2112_device *dev = gpiochip_get_data(chip); 256 257 guard(mutex)(&dev->lock); 258 259 return cp2112_gpio_set_unlocked(dev, offset, value); 260 } 261 262 static int cp2112_gpio_get_all(struct gpio_chip *chip) 263 { 264 struct cp2112_device *dev = gpiochip_get_data(chip); 265 struct hid_device *hdev = dev->hdev; 266 u8 *buf = dev->in_out_buffer; 267 int ret; 268 269 guard(mutex)(&dev->lock); 270 271 ret = hid_hw_raw_request(hdev, CP2112_GPIO_GET, buf, 272 CP2112_GPIO_GET_LENGTH, HID_FEATURE_REPORT, 273 HID_REQ_GET_REPORT); 274 if (ret != CP2112_GPIO_GET_LENGTH) { 275 hid_err(hdev, "error requesting GPIO values: %d\n", ret); 276 return ret < 0 ? ret : -EIO; 277 } 278 279 return buf[1]; 280 } 281 282 static int cp2112_gpio_get(struct gpio_chip *chip, unsigned int offset) 283 { 284 int ret; 285 286 ret = cp2112_gpio_get_all(chip); 287 if (ret < 0) 288 return ret; 289 290 return (ret >> offset) & 1; 291 } 292 293 static int cp2112_gpio_direction_output(struct gpio_chip *chip, 294 unsigned offset, int value) 295 { 296 struct cp2112_device *dev = gpiochip_get_data(chip); 297 struct hid_device *hdev = dev->hdev; 298 u8 *buf = dev->in_out_buffer; 299 int ret; 300 301 guard(mutex)(&dev->lock); 302 303 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, 304 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, 305 HID_REQ_GET_REPORT); 306 if (ret != CP2112_GPIO_CONFIG_LENGTH) { 307 hid_err(hdev, "error requesting GPIO config: %d\n", ret); 308 return ret < 0 ? ret : -EIO; 309 } 310 311 buf[1] |= 1 << offset; 312 buf[2] = gpio_push_pull; 313 314 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, 315 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, 316 HID_REQ_SET_REPORT); 317 if (ret < 0) { 318 hid_err(hdev, "error setting GPIO config: %d\n", ret); 319 return ret; 320 } 321 322 /* 323 * Set gpio value when output direction is already set, 324 * as specified in AN495, Rev. 0.2, cpt. 4.4 325 */ 326 return cp2112_gpio_set_unlocked(dev, offset, value); 327 } 328 329 static int cp2112_hid_get(struct hid_device *hdev, unsigned char report_number, 330 u8 *data, size_t count, unsigned char report_type) 331 { 332 u8 *buf; 333 int ret; 334 335 buf = kmalloc(count, GFP_KERNEL); 336 if (!buf) 337 return -ENOMEM; 338 339 ret = hid_hw_raw_request(hdev, report_number, buf, count, 340 report_type, HID_REQ_GET_REPORT); 341 memcpy(data, buf, count); 342 kfree(buf); 343 return ret; 344 } 345 346 static int cp2112_hid_output(struct hid_device *hdev, u8 *data, size_t count, 347 unsigned char report_type) 348 { 349 u8 *buf; 350 int ret; 351 352 buf = kmemdup(data, count, GFP_KERNEL); 353 if (!buf) 354 return -ENOMEM; 355 356 if (report_type == HID_OUTPUT_REPORT) 357 ret = hid_hw_output_report(hdev, buf, count); 358 else 359 ret = hid_hw_raw_request(hdev, buf[0], buf, count, report_type, 360 HID_REQ_SET_REPORT); 361 362 kfree(buf); 363 return ret; 364 } 365 366 static int cp2112_wait(struct cp2112_device *dev, atomic_t *avail) 367 { 368 int ret = 0; 369 370 /* We have sent either a CP2112_TRANSFER_STATUS_REQUEST or a 371 * CP2112_DATA_READ_FORCE_SEND and we are waiting for the response to 372 * come in cp2112_raw_event or timeout. There will only be one of these 373 * in flight at any one time. The timeout is extremely large and is a 374 * last resort if the CP2112 has died. If we do timeout we don't expect 375 * to receive the response which would cause data races, it's not like 376 * we can do anything about it anyway. 377 */ 378 ret = wait_event_interruptible_timeout(dev->wait, 379 atomic_read(avail), msecs_to_jiffies(RESPONSE_TIMEOUT)); 380 if (-ERESTARTSYS == ret) 381 return ret; 382 if (!ret) 383 return -ETIMEDOUT; 384 385 atomic_set(avail, 0); 386 return 0; 387 } 388 389 static int cp2112_xfer_status(struct cp2112_device *dev) 390 { 391 struct hid_device *hdev = dev->hdev; 392 u8 buf[2]; 393 int ret; 394 395 buf[0] = CP2112_TRANSFER_STATUS_REQUEST; 396 buf[1] = 0x01; 397 atomic_set(&dev->xfer_avail, 0); 398 399 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); 400 if (ret < 0) { 401 hid_warn(hdev, "Error requesting status: %d\n", ret); 402 return ret; 403 } 404 405 ret = cp2112_wait(dev, &dev->xfer_avail); 406 if (ret) 407 return ret; 408 409 return dev->xfer_status; 410 } 411 412 static int cp2112_read(struct cp2112_device *dev, u8 *data, size_t size) 413 { 414 struct hid_device *hdev = dev->hdev; 415 struct cp2112_force_read_report report; 416 int ret; 417 418 if (size > sizeof(dev->read_data)) 419 size = sizeof(dev->read_data); 420 report.report = CP2112_DATA_READ_FORCE_SEND; 421 report.length = cpu_to_be16(size); 422 423 atomic_set(&dev->read_avail, 0); 424 425 ret = cp2112_hid_output(hdev, &report.report, sizeof(report), 426 HID_OUTPUT_REPORT); 427 if (ret < 0) { 428 hid_warn(hdev, "Error requesting data: %d\n", ret); 429 return ret; 430 } 431 432 ret = cp2112_wait(dev, &dev->read_avail); 433 if (ret) 434 return ret; 435 436 hid_dbg(hdev, "read %d of %zd bytes requested\n", 437 dev->read_length, size); 438 439 if (size > dev->read_length) 440 size = dev->read_length; 441 442 memcpy(data, dev->read_data, size); 443 return dev->read_length; 444 } 445 446 static int cp2112_read_req(void *buf, u8 slave_address, u16 length) 447 { 448 struct cp2112_read_req_report *report = buf; 449 450 if (length < 1 || length > 512) 451 return -EINVAL; 452 453 report->report = CP2112_DATA_READ_REQUEST; 454 report->slave_address = slave_address << 1; 455 report->length = cpu_to_be16(length); 456 return sizeof(*report); 457 } 458 459 static int cp2112_write_read_req(void *buf, u8 slave_address, u16 length, 460 u8 command, u8 *data, u8 data_length) 461 { 462 struct cp2112_write_read_req_report *report = buf; 463 464 if (length < 1 || length > 512 465 || data_length > sizeof(report->target_address) - 1) 466 return -EINVAL; 467 468 report->report = CP2112_DATA_WRITE_READ_REQUEST; 469 report->slave_address = slave_address << 1; 470 report->length = cpu_to_be16(length); 471 report->target_address_length = data_length + 1; 472 report->target_address[0] = command; 473 memcpy(&report->target_address[1], data, data_length); 474 return data_length + 6; 475 } 476 477 static int cp2112_write_req(void *buf, u8 slave_address, u8 command, u8 *data, 478 u8 data_length) 479 { 480 struct cp2112_write_req_report *report = buf; 481 482 if (data_length > sizeof(report->data) - 1) 483 return -EINVAL; 484 485 report->report = CP2112_DATA_WRITE_REQUEST; 486 report->slave_address = slave_address << 1; 487 report->length = data_length + 1; 488 report->data[0] = command; 489 memcpy(&report->data[1], data, data_length); 490 return data_length + 4; 491 } 492 493 static int cp2112_i2c_write_req(void *buf, u8 slave_address, u8 *data, 494 u8 data_length) 495 { 496 struct cp2112_write_req_report *report = buf; 497 498 if (data_length > sizeof(report->data)) 499 return -EINVAL; 500 501 report->report = CP2112_DATA_WRITE_REQUEST; 502 report->slave_address = slave_address << 1; 503 report->length = data_length; 504 memcpy(report->data, data, data_length); 505 return data_length + 3; 506 } 507 508 static int cp2112_i2c_write_read_req(void *buf, u8 slave_address, 509 u8 *addr, int addr_length, 510 int read_length) 511 { 512 struct cp2112_write_read_req_report *report = buf; 513 514 if (read_length < 1 || read_length > 512 || 515 addr_length > sizeof(report->target_address)) 516 return -EINVAL; 517 518 report->report = CP2112_DATA_WRITE_READ_REQUEST; 519 report->slave_address = slave_address << 1; 520 report->length = cpu_to_be16(read_length); 521 report->target_address_length = addr_length; 522 memcpy(report->target_address, addr, addr_length); 523 return addr_length + 5; 524 } 525 526 static int cp2112_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, 527 int num) 528 { 529 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; 530 struct hid_device *hdev = dev->hdev; 531 u8 buf[64]; 532 ssize_t count; 533 ssize_t read_length = 0; 534 u8 *read_buf = NULL; 535 unsigned int retries; 536 int ret; 537 538 hid_dbg(hdev, "I2C %d messages\n", num); 539 540 if (num == 1) { 541 hid_dbg(hdev, "I2C %s %#04x len %d\n", 542 str_read_write(msgs->flags & I2C_M_RD), msgs->addr, msgs->len); 543 if (msgs->flags & I2C_M_RD) { 544 read_length = msgs->len; 545 read_buf = msgs->buf; 546 count = cp2112_read_req(buf, msgs->addr, msgs->len); 547 } else { 548 count = cp2112_i2c_write_req(buf, msgs->addr, 549 msgs->buf, msgs->len); 550 } 551 if (count < 0) 552 return count; 553 } else if (dev->hwversion > 1 && /* no repeated start in rev 1 */ 554 num == 2 && 555 msgs[0].addr == msgs[1].addr && 556 !(msgs[0].flags & I2C_M_RD) && (msgs[1].flags & I2C_M_RD)) { 557 hid_dbg(hdev, "I2C write-read %#04x wlen %d rlen %d\n", 558 msgs[0].addr, msgs[0].len, msgs[1].len); 559 read_length = msgs[1].len; 560 read_buf = msgs[1].buf; 561 count = cp2112_i2c_write_read_req(buf, msgs[0].addr, 562 msgs[0].buf, msgs[0].len, msgs[1].len); 563 if (count < 0) 564 return count; 565 } else { 566 hid_err(hdev, 567 "Multi-message I2C transactions not supported\n"); 568 return -EOPNOTSUPP; 569 } 570 571 ret = hid_hw_power(hdev, PM_HINT_FULLON); 572 if (ret < 0) { 573 hid_err(hdev, "power management error: %d\n", ret); 574 return ret; 575 } 576 577 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); 578 if (ret < 0) { 579 hid_warn(hdev, "Error starting transaction: %d\n", ret); 580 goto power_normal; 581 } 582 583 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { 584 ret = cp2112_xfer_status(dev); 585 if (-EBUSY == ret) 586 continue; 587 if (ret < 0) 588 goto power_normal; 589 break; 590 } 591 592 if (XFER_STATUS_RETRIES <= retries) { 593 hid_warn(hdev, "Transfer timed out, cancelling.\n"); 594 buf[0] = CP2112_CANCEL_TRANSFER; 595 buf[1] = 0x01; 596 597 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); 598 if (ret < 0) 599 hid_warn(hdev, "Error cancelling transaction: %d\n", 600 ret); 601 602 ret = -ETIMEDOUT; 603 goto power_normal; 604 } 605 606 for (count = 0; count < read_length;) { 607 ret = cp2112_read(dev, read_buf + count, read_length - count); 608 if (ret < 0) 609 goto power_normal; 610 if (ret == 0) { 611 hid_err(hdev, "read returned 0\n"); 612 ret = -EIO; 613 goto power_normal; 614 } 615 count += ret; 616 if (count > read_length) { 617 /* 618 * The hardware returned too much data. 619 * This is mostly harmless because cp2112_read() 620 * has a limit check so didn't overrun our 621 * buffer. Nevertheless, we return an error 622 * because something is seriously wrong and 623 * it shouldn't go unnoticed. 624 */ 625 hid_err(hdev, "long read: %d > %zd\n", 626 ret, read_length - count + ret); 627 ret = -EIO; 628 goto power_normal; 629 } 630 } 631 632 /* return the number of transferred messages */ 633 ret = num; 634 635 power_normal: 636 hid_hw_power(hdev, PM_HINT_NORMAL); 637 hid_dbg(hdev, "I2C transfer finished: %d\n", ret); 638 return ret; 639 } 640 641 static int cp2112_xfer(struct i2c_adapter *adap, u16 addr, 642 unsigned short flags, char read_write, u8 command, 643 int size, union i2c_smbus_data *data) 644 { 645 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; 646 struct hid_device *hdev = dev->hdev; 647 u8 buf[64]; 648 __le16 word; 649 ssize_t count; 650 size_t read_length = 0; 651 unsigned int retries; 652 int ret; 653 654 hid_dbg(hdev, "%s addr 0x%x flags 0x%x cmd 0x%x size %d\n", 655 str_write_read(read_write == I2C_SMBUS_WRITE), 656 addr, flags, command, size); 657 658 switch (size) { 659 case I2C_SMBUS_BYTE: 660 read_length = 1; 661 662 if (I2C_SMBUS_READ == read_write) 663 count = cp2112_read_req(buf, addr, read_length); 664 else 665 count = cp2112_write_req(buf, addr, command, NULL, 666 0); 667 break; 668 case I2C_SMBUS_BYTE_DATA: 669 read_length = 1; 670 671 if (I2C_SMBUS_READ == read_write) 672 count = cp2112_write_read_req(buf, addr, read_length, 673 command, NULL, 0); 674 else 675 count = cp2112_write_req(buf, addr, command, 676 &data->byte, 1); 677 break; 678 case I2C_SMBUS_WORD_DATA: 679 read_length = 2; 680 word = cpu_to_le16(data->word); 681 682 if (I2C_SMBUS_READ == read_write) 683 count = cp2112_write_read_req(buf, addr, read_length, 684 command, NULL, 0); 685 else 686 count = cp2112_write_req(buf, addr, command, 687 (u8 *)&word, 2); 688 break; 689 case I2C_SMBUS_PROC_CALL: 690 size = I2C_SMBUS_WORD_DATA; 691 read_write = I2C_SMBUS_READ; 692 read_length = 2; 693 word = cpu_to_le16(data->word); 694 695 count = cp2112_write_read_req(buf, addr, read_length, command, 696 (u8 *)&word, 2); 697 break; 698 case I2C_SMBUS_I2C_BLOCK_DATA: 699 if (read_write == I2C_SMBUS_READ) { 700 read_length = data->block[0]; 701 count = cp2112_write_read_req(buf, addr, read_length, 702 command, NULL, 0); 703 } else { 704 /* Copy starts from data->block[1] so the length can 705 * be at max I2C_SMBUS_CLOCK_MAX + 1 706 */ 707 708 if (data->block[0] > I2C_SMBUS_BLOCK_MAX + 1) 709 count = -EINVAL; 710 else 711 count = cp2112_write_req(buf, addr, command, 712 data->block + 1, 713 data->block[0]); 714 } 715 break; 716 case I2C_SMBUS_BLOCK_DATA: 717 if (I2C_SMBUS_READ == read_write) { 718 count = cp2112_write_read_req(buf, addr, 719 I2C_SMBUS_BLOCK_MAX, 720 command, NULL, 0); 721 } else { 722 /* data_length here is data->block[0] + 1 723 * so make sure that the data->block[0] is 724 * less than or equals I2C_SMBUS_BLOCK_MAX + 1 725 */ 726 if (data->block[0] > I2C_SMBUS_BLOCK_MAX + 1) 727 count = -EINVAL; 728 else 729 count = cp2112_write_req(buf, addr, command, 730 data->block, 731 data->block[0] + 1); 732 } 733 break; 734 case I2C_SMBUS_BLOCK_PROC_CALL: 735 size = I2C_SMBUS_BLOCK_DATA; 736 read_write = I2C_SMBUS_READ; 737 738 /* data_length is data->block[0] + 1, so 739 * so data->block[0] should be less than or 740 * equal to the I2C_SMBUS_BLOCK_MAX + 1 741 */ 742 if (data->block[0] > I2C_SMBUS_BLOCK_MAX + 1) 743 count = -EINVAL; 744 else 745 count = cp2112_write_read_req(buf, addr, I2C_SMBUS_BLOCK_MAX, 746 command, data->block, 747 data->block[0] + 1); 748 break; 749 default: 750 hid_warn(hdev, "Unsupported transaction %d\n", size); 751 return -EOPNOTSUPP; 752 } 753 754 if (count < 0) 755 return count; 756 757 ret = hid_hw_power(hdev, PM_HINT_FULLON); 758 if (ret < 0) { 759 hid_err(hdev, "power management error: %d\n", ret); 760 return ret; 761 } 762 763 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); 764 if (ret < 0) { 765 hid_warn(hdev, "Error starting transaction: %d\n", ret); 766 goto power_normal; 767 } 768 769 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { 770 ret = cp2112_xfer_status(dev); 771 if (-EBUSY == ret) 772 continue; 773 if (ret < 0) 774 goto power_normal; 775 break; 776 } 777 778 if (XFER_STATUS_RETRIES <= retries) { 779 hid_warn(hdev, "Transfer timed out, cancelling.\n"); 780 buf[0] = CP2112_CANCEL_TRANSFER; 781 buf[1] = 0x01; 782 783 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); 784 if (ret < 0) 785 hid_warn(hdev, "Error cancelling transaction: %d\n", 786 ret); 787 788 ret = -ETIMEDOUT; 789 goto power_normal; 790 } 791 792 if (I2C_SMBUS_WRITE == read_write) { 793 ret = 0; 794 goto power_normal; 795 } 796 797 if (I2C_SMBUS_BLOCK_DATA == size) 798 read_length = ret; 799 800 ret = cp2112_read(dev, buf, read_length); 801 if (ret < 0) 802 goto power_normal; 803 if (ret != read_length) { 804 hid_warn(hdev, "short read: %d < %zd\n", ret, read_length); 805 ret = -EIO; 806 goto power_normal; 807 } 808 809 switch (size) { 810 case I2C_SMBUS_BYTE: 811 case I2C_SMBUS_BYTE_DATA: 812 data->byte = buf[0]; 813 break; 814 case I2C_SMBUS_WORD_DATA: 815 data->word = le16_to_cpup((__le16 *)buf); 816 break; 817 case I2C_SMBUS_I2C_BLOCK_DATA: 818 if (read_length > I2C_SMBUS_BLOCK_MAX) { 819 ret = -EINVAL; 820 goto power_normal; 821 } 822 823 memcpy(data->block + 1, buf, read_length); 824 break; 825 case I2C_SMBUS_BLOCK_DATA: 826 if (read_length > I2C_SMBUS_BLOCK_MAX) { 827 ret = -EPROTO; 828 goto power_normal; 829 } 830 831 memcpy(data->block, buf, read_length); 832 break; 833 } 834 835 ret = 0; 836 power_normal: 837 hid_hw_power(hdev, PM_HINT_NORMAL); 838 hid_dbg(hdev, "transfer finished: %d\n", ret); 839 return ret; 840 } 841 842 static u32 cp2112_functionality(struct i2c_adapter *adap) 843 { 844 return I2C_FUNC_I2C | 845 I2C_FUNC_SMBUS_BYTE | 846 I2C_FUNC_SMBUS_BYTE_DATA | 847 I2C_FUNC_SMBUS_WORD_DATA | 848 I2C_FUNC_SMBUS_BLOCK_DATA | 849 I2C_FUNC_SMBUS_I2C_BLOCK | 850 I2C_FUNC_SMBUS_PROC_CALL | 851 I2C_FUNC_SMBUS_BLOCK_PROC_CALL; 852 } 853 854 static const struct i2c_algorithm smbus_algorithm = { 855 .master_xfer = cp2112_i2c_xfer, 856 .smbus_xfer = cp2112_xfer, 857 .functionality = cp2112_functionality, 858 }; 859 860 static int cp2112_get_usb_config(struct hid_device *hdev, 861 struct cp2112_usb_config_report *cfg) 862 { 863 int ret; 864 865 ret = cp2112_hid_get(hdev, CP2112_USB_CONFIG, (u8 *)cfg, sizeof(*cfg), 866 HID_FEATURE_REPORT); 867 if (ret != sizeof(*cfg)) { 868 hid_err(hdev, "error reading usb config: %d\n", ret); 869 if (ret < 0) 870 return ret; 871 return -EIO; 872 } 873 874 return 0; 875 } 876 877 static int cp2112_set_usb_config(struct hid_device *hdev, 878 struct cp2112_usb_config_report *cfg) 879 { 880 int ret; 881 882 if (WARN_ON(cfg->report != CP2112_USB_CONFIG)) 883 return -EINVAL; 884 885 ret = cp2112_hid_output(hdev, (u8 *)cfg, sizeof(*cfg), 886 HID_FEATURE_REPORT); 887 if (ret != sizeof(*cfg)) { 888 hid_err(hdev, "error writing usb config: %d\n", ret); 889 if (ret < 0) 890 return ret; 891 return -EIO; 892 } 893 894 return 0; 895 } 896 897 static void chmod_sysfs_attrs(struct hid_device *hdev); 898 899 #define CP2112_CONFIG_ATTR(name, store, format, ...) \ 900 static ssize_t name##_store(struct device *kdev, \ 901 struct device_attribute *attr, const char *buf, \ 902 size_t count) \ 903 { \ 904 struct hid_device *hdev = to_hid_device(kdev); \ 905 struct cp2112_usb_config_report cfg; \ 906 int ret = cp2112_get_usb_config(hdev, &cfg); \ 907 if (ret) \ 908 return ret; \ 909 store; \ 910 ret = cp2112_set_usb_config(hdev, &cfg); \ 911 if (ret) \ 912 return ret; \ 913 chmod_sysfs_attrs(hdev); \ 914 return count; \ 915 } \ 916 static ssize_t name##_show(struct device *kdev, \ 917 struct device_attribute *attr, char *buf) \ 918 { \ 919 struct hid_device *hdev = to_hid_device(kdev); \ 920 struct cp2112_usb_config_report cfg; \ 921 int ret = cp2112_get_usb_config(hdev, &cfg); \ 922 if (ret) \ 923 return ret; \ 924 return sysfs_emit(buf, format, ##__VA_ARGS__); \ 925 } \ 926 static DEVICE_ATTR_RW(name); 927 928 CP2112_CONFIG_ATTR(vendor_id, ({ 929 u16 vid; 930 931 if (sscanf(buf, "%hi", &vid) != 1) 932 return -EINVAL; 933 934 cfg.vid = cpu_to_le16(vid); 935 cfg.mask = 0x01; 936 }), "0x%04x\n", le16_to_cpu(cfg.vid)); 937 938 CP2112_CONFIG_ATTR(product_id, ({ 939 u16 pid; 940 941 if (sscanf(buf, "%hi", &pid) != 1) 942 return -EINVAL; 943 944 cfg.pid = cpu_to_le16(pid); 945 cfg.mask = 0x02; 946 }), "0x%04x\n", le16_to_cpu(cfg.pid)); 947 948 CP2112_CONFIG_ATTR(max_power, ({ 949 int mA; 950 951 if (sscanf(buf, "%i", &mA) != 1) 952 return -EINVAL; 953 954 cfg.max_power = (mA + 1) / 2; 955 cfg.mask = 0x04; 956 }), "%u mA\n", cfg.max_power * 2); 957 958 CP2112_CONFIG_ATTR(power_mode, ({ 959 if (sscanf(buf, "%hhi", &cfg.power_mode) != 1) 960 return -EINVAL; 961 962 cfg.mask = 0x08; 963 }), "%u\n", cfg.power_mode); 964 965 CP2112_CONFIG_ATTR(release_version, ({ 966 if (sscanf(buf, "%hhi.%hhi", &cfg.release_major, &cfg.release_minor) 967 != 2) 968 return -EINVAL; 969 970 cfg.mask = 0x10; 971 }), "%u.%u\n", cfg.release_major, cfg.release_minor); 972 973 #undef CP2112_CONFIG_ATTR 974 975 static ssize_t pstr_store(struct device *kdev, struct device_attribute *kattr, 976 const char *buf, size_t count, int number) 977 { 978 struct hid_device *hdev = to_hid_device(kdev); 979 struct cp2112_string_report report; 980 int ret; 981 982 memset(&report, 0, sizeof(report)); 983 984 ret = utf8s_to_utf16s(buf, count, UTF16_LITTLE_ENDIAN, 985 report.string, ARRAY_SIZE(report.string)); 986 report.report = number; 987 report.length = ret * sizeof(report.string[0]) + 2; 988 report.type = USB_DT_STRING; 989 990 ret = cp2112_hid_output(hdev, &report.report, report.length + 1, 991 HID_FEATURE_REPORT); 992 if (ret != report.length + 1) { 993 hid_err(hdev, "error writing %s string: %d\n", kattr->attr.name, 994 ret); 995 if (ret < 0) 996 return ret; 997 return -EIO; 998 } 999 1000 chmod_sysfs_attrs(hdev); 1001 return count; 1002 } 1003 1004 static ssize_t pstr_show(struct device *kdev, struct device_attribute *kattr, 1005 char *buf, int number) 1006 { 1007 struct hid_device *hdev = to_hid_device(kdev); 1008 struct cp2112_string_report report; 1009 u8 length; 1010 int ret; 1011 1012 ret = cp2112_hid_get(hdev, number, (u8 *)&report.contents, 1013 sizeof(report.contents), HID_FEATURE_REPORT); 1014 if (ret < 3) { 1015 hid_err(hdev, "error reading %s string: %d\n", kattr->attr.name, 1016 ret); 1017 if (ret < 0) 1018 return ret; 1019 return -EIO; 1020 } 1021 1022 if (report.length < 2) { 1023 hid_err(hdev, "invalid %s string length: %d\n", 1024 kattr->attr.name, report.length); 1025 return -EIO; 1026 } 1027 1028 length = report.length > ret - 1 ? ret - 1 : report.length; 1029 length = (length - 2) / sizeof(report.string[0]); 1030 ret = utf16s_to_utf8s(report.string, length, UTF16_LITTLE_ENDIAN, buf, 1031 PAGE_SIZE - 1); 1032 buf[ret++] = '\n'; 1033 return ret; 1034 } 1035 1036 #define CP2112_PSTR_ATTR(name, _report) \ 1037 static ssize_t name##_store(struct device *kdev, struct device_attribute *kattr, \ 1038 const char *buf, size_t count) \ 1039 { \ 1040 return pstr_store(kdev, kattr, buf, count, _report); \ 1041 } \ 1042 static ssize_t name##_show(struct device *kdev, struct device_attribute *kattr, char *buf) \ 1043 { \ 1044 return pstr_show(kdev, kattr, buf, _report); \ 1045 } \ 1046 static DEVICE_ATTR_RW(name); 1047 1048 CP2112_PSTR_ATTR(manufacturer, CP2112_MANUFACTURER_STRING); 1049 CP2112_PSTR_ATTR(product, CP2112_PRODUCT_STRING); 1050 CP2112_PSTR_ATTR(serial, CP2112_SERIAL_STRING); 1051 1052 #undef CP2112_PSTR_ATTR 1053 1054 static const struct attribute_group cp2112_attr_group = { 1055 .attrs = (struct attribute *[]){ 1056 &dev_attr_vendor_id.attr, 1057 &dev_attr_product_id.attr, 1058 &dev_attr_max_power.attr, 1059 &dev_attr_power_mode.attr, 1060 &dev_attr_release_version.attr, 1061 &dev_attr_manufacturer.attr, 1062 &dev_attr_product.attr, 1063 &dev_attr_serial.attr, 1064 NULL 1065 } 1066 }; 1067 1068 /* Chmoding our sysfs attributes is simply a way to expose which fields in the 1069 * PROM have already been programmed. We do not depend on this preventing 1070 * writing to these attributes since the CP2112 will simply ignore writes to 1071 * already-programmed fields. This is why there is no sense in fixing this 1072 * racy behaviour. 1073 */ 1074 static void chmod_sysfs_attrs(struct hid_device *hdev) 1075 { 1076 struct attribute **attr; 1077 u8 buf[2]; 1078 int ret; 1079 1080 ret = cp2112_hid_get(hdev, CP2112_LOCK_BYTE, buf, sizeof(buf), 1081 HID_FEATURE_REPORT); 1082 if (ret != sizeof(buf)) { 1083 hid_err(hdev, "error reading lock byte: %d\n", ret); 1084 return; 1085 } 1086 1087 for (attr = cp2112_attr_group.attrs; *attr; ++attr) { 1088 umode_t mode = (buf[1] & 1) ? 0644 : 0444; 1089 ret = sysfs_chmod_file(&hdev->dev.kobj, *attr, mode); 1090 if (ret < 0) 1091 hid_err(hdev, "error chmoding sysfs file %s\n", 1092 (*attr)->name); 1093 buf[1] >>= 1; 1094 } 1095 } 1096 1097 static void cp2112_gpio_irq_ack(struct irq_data *d) 1098 { 1099 } 1100 1101 static void cp2112_gpio_irq_mask(struct irq_data *d) 1102 { 1103 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1104 struct cp2112_device *dev = gpiochip_get_data(gc); 1105 irq_hw_number_t hwirq = irqd_to_hwirq(d); 1106 1107 __clear_bit(hwirq, &dev->irq_mask); 1108 gpiochip_disable_irq(gc, hwirq); 1109 } 1110 1111 static void cp2112_gpio_irq_unmask(struct irq_data *d) 1112 { 1113 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1114 struct cp2112_device *dev = gpiochip_get_data(gc); 1115 irq_hw_number_t hwirq = irqd_to_hwirq(d); 1116 1117 gpiochip_enable_irq(gc, hwirq); 1118 __set_bit(hwirq, &dev->irq_mask); 1119 } 1120 1121 static void cp2112_gpio_poll_callback(struct work_struct *work) 1122 { 1123 struct cp2112_device *dev = container_of(work, struct cp2112_device, 1124 gpio_poll_worker.work); 1125 u8 gpio_mask; 1126 u32 irq_type; 1127 int irq, virq, ret; 1128 1129 ret = cp2112_gpio_get_all(&dev->gc); 1130 if (ret == -ENODEV) /* the hardware has been disconnected */ 1131 return; 1132 if (ret < 0) 1133 goto exit; 1134 1135 gpio_mask = ret; 1136 for_each_set_bit(virq, &dev->irq_mask, CP2112_GPIO_MAX_GPIO) { 1137 irq = irq_find_mapping(dev->gc.irq.domain, virq); 1138 if (!irq) 1139 continue; 1140 1141 irq_type = irq_get_trigger_type(irq); 1142 if (!irq_type) 1143 continue; 1144 1145 if (gpio_mask & BIT(virq)) { 1146 /* Level High */ 1147 1148 if (irq_type & IRQ_TYPE_LEVEL_HIGH) 1149 handle_nested_irq(irq); 1150 1151 if ((irq_type & IRQ_TYPE_EDGE_RISING) && 1152 !(dev->gpio_prev_state & BIT(virq))) 1153 handle_nested_irq(irq); 1154 } else { 1155 /* Level Low */ 1156 1157 if (irq_type & IRQ_TYPE_LEVEL_LOW) 1158 handle_nested_irq(irq); 1159 1160 if ((irq_type & IRQ_TYPE_EDGE_FALLING) && 1161 (dev->gpio_prev_state & BIT(virq))) 1162 handle_nested_irq(irq); 1163 } 1164 } 1165 1166 dev->gpio_prev_state = gpio_mask; 1167 1168 exit: 1169 if (dev->gpio_poll) 1170 schedule_delayed_work(&dev->gpio_poll_worker, 10); 1171 } 1172 1173 1174 static unsigned int cp2112_gpio_irq_startup(struct irq_data *d) 1175 { 1176 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1177 struct cp2112_device *dev = gpiochip_get_data(gc); 1178 1179 if (!dev->gpio_poll) { 1180 dev->gpio_poll = true; 1181 schedule_delayed_work(&dev->gpio_poll_worker, 0); 1182 } 1183 1184 cp2112_gpio_irq_unmask(d); 1185 return 0; 1186 } 1187 1188 static void cp2112_gpio_irq_shutdown(struct irq_data *d) 1189 { 1190 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1191 struct cp2112_device *dev = gpiochip_get_data(gc); 1192 1193 cp2112_gpio_irq_mask(d); 1194 1195 if (!dev->irq_mask) { 1196 dev->gpio_poll = false; 1197 cancel_delayed_work_sync(&dev->gpio_poll_worker); 1198 } 1199 } 1200 1201 static int cp2112_gpio_irq_type(struct irq_data *d, unsigned int type) 1202 { 1203 return 0; 1204 } 1205 1206 static const struct irq_chip cp2112_gpio_irqchip = { 1207 .name = "cp2112-gpio", 1208 .irq_startup = cp2112_gpio_irq_startup, 1209 .irq_shutdown = cp2112_gpio_irq_shutdown, 1210 .irq_ack = cp2112_gpio_irq_ack, 1211 .irq_mask = cp2112_gpio_irq_mask, 1212 .irq_unmask = cp2112_gpio_irq_unmask, 1213 .irq_set_type = cp2112_gpio_irq_type, 1214 .flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE, 1215 GPIOCHIP_IRQ_RESOURCE_HELPERS, 1216 }; 1217 1218 static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id) 1219 { 1220 struct cp2112_device *dev; 1221 u8 buf[3]; 1222 struct cp2112_smbus_config_report config; 1223 struct fwnode_handle *cp2112_fwnode; 1224 struct fwnode_handle *child; 1225 struct gpio_irq_chip *girq; 1226 struct i2c_timings timings; 1227 u32 addr; 1228 int ret; 1229 1230 dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL); 1231 if (!dev) 1232 return -ENOMEM; 1233 1234 dev->in_out_buffer = devm_kzalloc(&hdev->dev, CP2112_REPORT_MAX_LENGTH, 1235 GFP_KERNEL); 1236 if (!dev->in_out_buffer) 1237 return -ENOMEM; 1238 1239 ret = devm_mutex_init(&hdev->dev, &dev->lock); 1240 if (ret) { 1241 hid_err(hdev, "mutex init failed\n"); 1242 return ret; 1243 } 1244 1245 cp2112_fwnode = dev_fwnode(&hdev->dev); 1246 if (is_acpi_device_node(cp2112_fwnode)) { 1247 fwnode_for_each_child_node(cp2112_fwnode, child) { 1248 ret = acpi_get_local_address(ACPI_HANDLE_FWNODE(child), &addr); 1249 if (ret) 1250 continue; 1251 1252 switch (addr) { 1253 case CP2112_I2C_ADR: 1254 device_set_node(&dev->adap.dev, child); 1255 break; 1256 case CP2112_GPIO_ADR: 1257 dev->gc.fwnode = child; 1258 break; 1259 } 1260 } 1261 } else if (is_of_node(cp2112_fwnode)) { 1262 child = fwnode_get_named_child_node(cp2112_fwnode, "i2c"); 1263 device_set_node(&dev->adap.dev, child); 1264 fwnode_handle_put(child); 1265 } 1266 1267 ret = hid_parse(hdev); 1268 if (ret) { 1269 hid_err(hdev, "parse failed\n"); 1270 return ret; 1271 } 1272 1273 ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW); 1274 if (ret) { 1275 hid_err(hdev, "hw start failed\n"); 1276 return ret; 1277 } 1278 1279 ret = hid_hw_open(hdev); 1280 if (ret) { 1281 hid_err(hdev, "hw open failed\n"); 1282 goto err_hid_stop; 1283 } 1284 1285 ret = hid_hw_power(hdev, PM_HINT_FULLON); 1286 if (ret < 0) { 1287 hid_err(hdev, "power management error: %d\n", ret); 1288 goto err_hid_close; 1289 } 1290 1291 ret = cp2112_hid_get(hdev, CP2112_GET_VERSION_INFO, buf, sizeof(buf), 1292 HID_FEATURE_REPORT); 1293 if (ret != sizeof(buf)) { 1294 hid_err(hdev, "error requesting version\n"); 1295 if (ret >= 0) 1296 ret = -EIO; 1297 goto err_power_normal; 1298 } 1299 1300 hid_info(hdev, "Part Number: 0x%02X Device Version: 0x%02X\n", 1301 buf[1], buf[2]); 1302 1303 ret = cp2112_hid_get(hdev, CP2112_SMBUS_CONFIG, (u8 *)&config, 1304 sizeof(config), HID_FEATURE_REPORT); 1305 if (ret != sizeof(config)) { 1306 hid_err(hdev, "error requesting SMBus config\n"); 1307 if (ret >= 0) 1308 ret = -EIO; 1309 goto err_power_normal; 1310 } 1311 1312 i2c_parse_fw_timings(&dev->adap.dev, &timings, true); 1313 1314 config.clock_speed = cpu_to_be32(timings.bus_freq_hz); 1315 config.retry_time = cpu_to_be16(1); 1316 1317 ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config), 1318 HID_FEATURE_REPORT); 1319 if (ret != sizeof(config)) { 1320 hid_err(hdev, "error setting SMBus config\n"); 1321 if (ret >= 0) 1322 ret = -EIO; 1323 goto err_power_normal; 1324 } 1325 1326 hid_set_drvdata(hdev, (void *)dev); 1327 dev->hdev = hdev; 1328 dev->adap.owner = THIS_MODULE; 1329 dev->adap.class = I2C_CLASS_HWMON; 1330 dev->adap.algo = &smbus_algorithm; 1331 dev->adap.algo_data = dev; 1332 dev->adap.dev.parent = &hdev->dev; 1333 snprintf(dev->adap.name, sizeof(dev->adap.name), 1334 "CP2112 SMBus Bridge on hidraw%d", 1335 ((struct hidraw *)hdev->hidraw)->minor); 1336 dev->hwversion = buf[2]; 1337 init_waitqueue_head(&dev->wait); 1338 1339 hid_device_io_start(hdev); 1340 ret = i2c_add_adapter(&dev->adap); 1341 hid_device_io_stop(hdev); 1342 1343 if (ret) { 1344 hid_err(hdev, "error registering i2c adapter\n"); 1345 goto err_power_normal; 1346 } 1347 1348 hid_dbg(hdev, "adapter registered\n"); 1349 1350 dev->gc.label = "cp2112_gpio"; 1351 dev->gc.direction_input = cp2112_gpio_direction_input; 1352 dev->gc.direction_output = cp2112_gpio_direction_output; 1353 dev->gc.set = cp2112_gpio_set; 1354 dev->gc.get = cp2112_gpio_get; 1355 dev->gc.base = -1; 1356 dev->gc.ngpio = CP2112_GPIO_MAX_GPIO; 1357 dev->gc.can_sleep = 1; 1358 dev->gc.parent = &hdev->dev; 1359 1360 girq = &dev->gc.irq; 1361 gpio_irq_chip_set_chip(girq, &cp2112_gpio_irqchip); 1362 /* The event comes from the outside so no parent handler */ 1363 girq->parent_handler = NULL; 1364 girq->num_parents = 0; 1365 girq->parents = NULL; 1366 girq->default_type = IRQ_TYPE_NONE; 1367 girq->handler = handle_simple_irq; 1368 girq->threaded = true; 1369 1370 INIT_DELAYED_WORK(&dev->gpio_poll_worker, cp2112_gpio_poll_callback); 1371 1372 ret = gpiochip_add_data(&dev->gc, dev); 1373 if (ret < 0) { 1374 hid_err(hdev, "error registering gpio chip\n"); 1375 goto err_free_i2c; 1376 } 1377 1378 ret = sysfs_create_group(&hdev->dev.kobj, &cp2112_attr_group); 1379 if (ret < 0) { 1380 hid_err(hdev, "error creating sysfs attrs\n"); 1381 goto err_gpiochip_remove; 1382 } 1383 1384 chmod_sysfs_attrs(hdev); 1385 hid_hw_power(hdev, PM_HINT_NORMAL); 1386 1387 return ret; 1388 1389 err_gpiochip_remove: 1390 gpiochip_remove(&dev->gc); 1391 err_free_i2c: 1392 i2c_del_adapter(&dev->adap); 1393 err_power_normal: 1394 hid_hw_power(hdev, PM_HINT_NORMAL); 1395 err_hid_close: 1396 hid_hw_close(hdev); 1397 err_hid_stop: 1398 hid_hw_stop(hdev); 1399 return ret; 1400 } 1401 1402 static void cp2112_remove(struct hid_device *hdev) 1403 { 1404 struct cp2112_device *dev = hid_get_drvdata(hdev); 1405 1406 sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group); 1407 i2c_del_adapter(&dev->adap); 1408 1409 if (dev->gpio_poll) { 1410 dev->gpio_poll = false; 1411 cancel_delayed_work_sync(&dev->gpio_poll_worker); 1412 } 1413 1414 gpiochip_remove(&dev->gc); 1415 /* i2c_del_adapter has finished removing all i2c devices from our 1416 * adapter. Well behaved devices should no longer call our cp2112_xfer 1417 * and should have waited for any pending calls to finish. It has also 1418 * waited for device_unregister(&adap->dev) to complete. Therefore we 1419 * can safely free our struct cp2112_device. 1420 */ 1421 hid_hw_close(hdev); 1422 hid_hw_stop(hdev); 1423 } 1424 1425 static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report, 1426 u8 *data, int size) 1427 { 1428 struct cp2112_device *dev = hid_get_drvdata(hdev); 1429 struct cp2112_xfer_status_report *xfer = (void *)data; 1430 1431 switch (data[0]) { 1432 case CP2112_TRANSFER_STATUS_RESPONSE: 1433 hid_dbg(hdev, "xfer status: %02x %02x %04x %04x\n", 1434 xfer->status0, xfer->status1, 1435 be16_to_cpu(xfer->retries), be16_to_cpu(xfer->length)); 1436 1437 switch (xfer->status0) { 1438 case STATUS0_IDLE: 1439 dev->xfer_status = -EAGAIN; 1440 break; 1441 case STATUS0_BUSY: 1442 dev->xfer_status = -EBUSY; 1443 break; 1444 case STATUS0_COMPLETE: 1445 dev->xfer_status = be16_to_cpu(xfer->length); 1446 break; 1447 case STATUS0_ERROR: 1448 switch (xfer->status1) { 1449 case STATUS1_TIMEOUT_NACK: 1450 case STATUS1_TIMEOUT_BUS: 1451 dev->xfer_status = -ETIMEDOUT; 1452 break; 1453 default: 1454 dev->xfer_status = -EIO; 1455 break; 1456 } 1457 break; 1458 default: 1459 dev->xfer_status = -EINVAL; 1460 break; 1461 } 1462 1463 atomic_set(&dev->xfer_avail, 1); 1464 break; 1465 case CP2112_DATA_READ_RESPONSE: 1466 hid_dbg(hdev, "read response: %02x %02x\n", data[1], data[2]); 1467 1468 dev->read_length = data[2]; 1469 if (dev->read_length > sizeof(dev->read_data)) 1470 dev->read_length = sizeof(dev->read_data); 1471 1472 memcpy(dev->read_data, &data[3], dev->read_length); 1473 atomic_set(&dev->read_avail, 1); 1474 break; 1475 default: 1476 hid_err(hdev, "unknown report\n"); 1477 1478 return 0; 1479 } 1480 1481 wake_up_interruptible(&dev->wait); 1482 return 1; 1483 } 1484 1485 static struct hid_driver cp2112_driver = { 1486 .name = "cp2112", 1487 .id_table = cp2112_devices, 1488 .probe = cp2112_probe, 1489 .remove = cp2112_remove, 1490 .raw_event = cp2112_raw_event, 1491 }; 1492 1493 module_hid_driver(cp2112_driver); 1494 MODULE_DESCRIPTION("Silicon Labs HID USB to SMBus master bridge"); 1495 MODULE_AUTHOR("David Barksdale <dbarksdale@uplogix.com>"); 1496 MODULE_LICENSE("GPL"); 1497 1498