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/gpio/driver.h> 21 #include <linux/hid.h> 22 #include <linux/hidraw.h> 23 #include <linux/i2c.h> 24 #include <linux/module.h> 25 #include <linux/nls.h> 26 #include <linux/string_choices.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 #define CP2112_GPIO_MAX_GPIO 8 35 #define CP2112_GPIO_ALL_GPIO_MASK GENMASK(7, 0) 36 37 enum { 38 CP2112_GPIO_CONFIG = 0x02, 39 CP2112_GPIO_GET = 0x03, 40 CP2112_GPIO_SET = 0x04, 41 CP2112_GET_VERSION_INFO = 0x05, 42 CP2112_SMBUS_CONFIG = 0x06, 43 CP2112_DATA_READ_REQUEST = 0x10, 44 CP2112_DATA_WRITE_READ_REQUEST = 0x11, 45 CP2112_DATA_READ_FORCE_SEND = 0x12, 46 CP2112_DATA_READ_RESPONSE = 0x13, 47 CP2112_DATA_WRITE_REQUEST = 0x14, 48 CP2112_TRANSFER_STATUS_REQUEST = 0x15, 49 CP2112_TRANSFER_STATUS_RESPONSE = 0x16, 50 CP2112_CANCEL_TRANSFER = 0x17, 51 CP2112_LOCK_BYTE = 0x20, 52 CP2112_USB_CONFIG = 0x21, 53 CP2112_MANUFACTURER_STRING = 0x22, 54 CP2112_PRODUCT_STRING = 0x23, 55 CP2112_SERIAL_STRING = 0x24, 56 }; 57 58 enum { 59 STATUS0_IDLE = 0x00, 60 STATUS0_BUSY = 0x01, 61 STATUS0_COMPLETE = 0x02, 62 STATUS0_ERROR = 0x03, 63 }; 64 65 enum { 66 STATUS1_TIMEOUT_NACK = 0x00, 67 STATUS1_TIMEOUT_BUS = 0x01, 68 STATUS1_ARBITRATION_LOST = 0x02, 69 STATUS1_READ_INCOMPLETE = 0x03, 70 STATUS1_WRITE_INCOMPLETE = 0x04, 71 STATUS1_SUCCESS = 0x05, 72 }; 73 74 struct cp2112_smbus_config_report { 75 u8 report; /* CP2112_SMBUS_CONFIG */ 76 __be32 clock_speed; /* Hz */ 77 u8 device_address; /* Stored in the upper 7 bits */ 78 u8 auto_send_read; /* 1 = enabled, 0 = disabled */ 79 __be16 write_timeout; /* ms, 0 = no timeout */ 80 __be16 read_timeout; /* ms, 0 = no timeout */ 81 u8 scl_low_timeout; /* 1 = enabled, 0 = disabled */ 82 __be16 retry_time; /* # of retries, 0 = no limit */ 83 } __packed; 84 85 struct cp2112_usb_config_report { 86 u8 report; /* CP2112_USB_CONFIG */ 87 __le16 vid; /* Vendor ID */ 88 __le16 pid; /* Product ID */ 89 u8 max_power; /* Power requested in 2mA units */ 90 u8 power_mode; /* 0x00 = bus powered 91 0x01 = self powered & regulator off 92 0x02 = self powered & regulator on */ 93 u8 release_major; 94 u8 release_minor; 95 u8 mask; /* What fields to program */ 96 } __packed; 97 98 struct cp2112_read_req_report { 99 u8 report; /* CP2112_DATA_READ_REQUEST */ 100 u8 slave_address; 101 __be16 length; 102 } __packed; 103 104 struct cp2112_write_read_req_report { 105 u8 report; /* CP2112_DATA_WRITE_READ_REQUEST */ 106 u8 slave_address; 107 __be16 length; 108 u8 target_address_length; 109 u8 target_address[16]; 110 } __packed; 111 112 struct cp2112_write_req_report { 113 u8 report; /* CP2112_DATA_WRITE_REQUEST */ 114 u8 slave_address; 115 u8 length; 116 u8 data[61]; 117 } __packed; 118 119 struct cp2112_force_read_report { 120 u8 report; /* CP2112_DATA_READ_FORCE_SEND */ 121 __be16 length; 122 } __packed; 123 124 struct cp2112_xfer_status_report { 125 u8 report; /* CP2112_TRANSFER_STATUS_RESPONSE */ 126 u8 status0; /* STATUS0_* */ 127 u8 status1; /* STATUS1_* */ 128 __be16 retries; 129 __be16 length; 130 } __packed; 131 132 struct cp2112_string_report { 133 u8 dummy; /* force .string to be aligned */ 134 struct_group_attr(contents, __packed, 135 u8 report; /* CP2112_*_STRING */ 136 u8 length; /* length in bytes of everything after .report */ 137 u8 type; /* USB_DT_STRING */ 138 wchar_t string[30]; /* UTF16_LITTLE_ENDIAN string */ 139 ); 140 } __packed; 141 142 /* Number of times to request transfer status before giving up waiting for a 143 transfer to complete. This may need to be changed if SMBUS clock, retries, 144 or read/write/scl_low timeout settings are changed. */ 145 static const int XFER_STATUS_RETRIES = 10; 146 147 /* Time in ms to wait for a CP2112_DATA_READ_RESPONSE or 148 CP2112_TRANSFER_STATUS_RESPONSE. */ 149 static const int RESPONSE_TIMEOUT = 50; 150 151 static const struct hid_device_id cp2112_devices[] = { 152 { HID_USB_DEVICE(USB_VENDOR_ID_CYGNAL, USB_DEVICE_ID_CYGNAL_CP2112) }, 153 { } 154 }; 155 MODULE_DEVICE_TABLE(hid, cp2112_devices); 156 157 struct cp2112_device { 158 struct i2c_adapter adap; 159 struct hid_device *hdev; 160 wait_queue_head_t wait; 161 u8 read_data[61]; 162 u8 read_length; 163 u8 hwversion; 164 int xfer_status; 165 atomic_t read_avail; 166 atomic_t xfer_avail; 167 struct gpio_chip gc; 168 u8 *in_out_buffer; 169 struct mutex lock; 170 171 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 = CP2112_GPIO_ALL_GPIO_MASK; 178 module_param(gpio_push_pull, int, 0644); 179 MODULE_PARM_DESC(gpio_push_pull, "GPIO push-pull configuration bitmask"); 180 cp2112_gpio_direction_input(struct gpio_chip * chip,unsigned offset)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] &= ~BIT(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 cp2112_gpio_set(struct gpio_chip * chip,unsigned offset,int value)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 ? CP2112_GPIO_ALL_GPIO_MASK : 0; 231 buf[2] = BIT(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 cp2112_gpio_get_all(struct gpio_chip * chip)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 cp2112_gpio_get(struct gpio_chip * chip,unsigned int offset)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 cp2112_gpio_direction_output(struct gpio_chip * chip,unsigned offset,int value)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 cp2112_hid_get(struct hid_device * hdev,unsigned char report_number,u8 * data,size_t count,unsigned char report_type)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 cp2112_hid_output(struct hid_device * hdev,u8 * data,size_t count,unsigned char report_type)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 cp2112_wait(struct cp2112_device * dev,atomic_t * avail)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 cp2112_xfer_status(struct cp2112_device * dev)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 cp2112_read(struct cp2112_device * dev,u8 * data,size_t size)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 cp2112_read_req(void * buf,u8 slave_address,u16 length)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 cp2112_write_read_req(void * buf,u8 slave_address,u16 length,u8 command,u8 * data,u8 data_length)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 cp2112_write_req(void * buf,u8 slave_address,u8 command,u8 * data,u8 data_length)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 cp2112_i2c_write_req(void * buf,u8 slave_address,u8 * data,u8 data_length)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 cp2112_i2c_write_read_req(void * buf,u8 slave_address,u8 * addr,int addr_length,int read_length)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 cp2112_i2c_xfer(struct i2c_adapter * adap,struct i2c_msg * msgs,int num)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 hid_dbg(hdev, "I2C %s %#04x len %d\n", 536 str_read_write(msgs->flags & I2C_M_RD), msgs->addr, msgs->len); 537 if (msgs->flags & I2C_M_RD) { 538 read_length = msgs->len; 539 read_buf = msgs->buf; 540 count = cp2112_read_req(buf, msgs->addr, msgs->len); 541 } else { 542 count = cp2112_i2c_write_req(buf, msgs->addr, 543 msgs->buf, msgs->len); 544 } 545 if (count < 0) 546 return count; 547 } else if (dev->hwversion > 1 && /* no repeated start in rev 1 */ 548 num == 2 && 549 msgs[0].addr == msgs[1].addr && 550 !(msgs[0].flags & I2C_M_RD) && (msgs[1].flags & I2C_M_RD)) { 551 hid_dbg(hdev, "I2C write-read %#04x wlen %d rlen %d\n", 552 msgs[0].addr, msgs[0].len, msgs[1].len); 553 read_length = msgs[1].len; 554 read_buf = msgs[1].buf; 555 count = cp2112_i2c_write_read_req(buf, msgs[0].addr, 556 msgs[0].buf, msgs[0].len, msgs[1].len); 557 if (count < 0) 558 return count; 559 } else { 560 hid_err(hdev, 561 "Multi-message I2C transactions not supported\n"); 562 return -EOPNOTSUPP; 563 } 564 565 ret = hid_hw_power(hdev, PM_HINT_FULLON); 566 if (ret < 0) { 567 hid_err(hdev, "power management error: %d\n", ret); 568 return ret; 569 } 570 571 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); 572 if (ret < 0) { 573 hid_warn(hdev, "Error starting transaction: %d\n", ret); 574 goto power_normal; 575 } 576 577 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { 578 ret = cp2112_xfer_status(dev); 579 if (-EBUSY == ret) 580 continue; 581 if (ret < 0) 582 goto power_normal; 583 break; 584 } 585 586 if (XFER_STATUS_RETRIES <= retries) { 587 hid_warn(hdev, "Transfer timed out, cancelling.\n"); 588 buf[0] = CP2112_CANCEL_TRANSFER; 589 buf[1] = 0x01; 590 591 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); 592 if (ret < 0) 593 hid_warn(hdev, "Error cancelling transaction: %d\n", 594 ret); 595 596 ret = -ETIMEDOUT; 597 goto power_normal; 598 } 599 600 for (count = 0; count < read_length;) { 601 ret = cp2112_read(dev, read_buf + count, read_length - count); 602 if (ret < 0) 603 goto power_normal; 604 if (ret == 0) { 605 hid_err(hdev, "read returned 0\n"); 606 ret = -EIO; 607 goto power_normal; 608 } 609 count += ret; 610 if (count > read_length) { 611 /* 612 * The hardware returned too much data. 613 * This is mostly harmless because cp2112_read() 614 * has a limit check so didn't overrun our 615 * buffer. Nevertheless, we return an error 616 * because something is seriously wrong and 617 * it shouldn't go unnoticed. 618 */ 619 hid_err(hdev, "long read: %d > %zd\n", 620 ret, read_length - count + ret); 621 ret = -EIO; 622 goto power_normal; 623 } 624 } 625 626 /* return the number of transferred messages */ 627 ret = num; 628 629 power_normal: 630 hid_hw_power(hdev, PM_HINT_NORMAL); 631 hid_dbg(hdev, "I2C transfer finished: %d\n", ret); 632 return ret; 633 } 634 cp2112_xfer(struct i2c_adapter * adap,u16 addr,unsigned short flags,char read_write,u8 command,int size,union i2c_smbus_data * data)635 static int cp2112_xfer(struct i2c_adapter *adap, u16 addr, 636 unsigned short flags, char read_write, u8 command, 637 int size, union i2c_smbus_data *data) 638 { 639 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; 640 struct hid_device *hdev = dev->hdev; 641 u8 buf[64]; 642 __le16 word; 643 ssize_t count; 644 size_t read_length = 0; 645 unsigned int retries; 646 int ret; 647 648 hid_dbg(hdev, "%s addr 0x%x flags 0x%x cmd 0x%x size %d\n", 649 str_write_read(read_write == I2C_SMBUS_WRITE), 650 addr, flags, command, size); 651 652 switch (size) { 653 case I2C_SMBUS_BYTE: 654 read_length = 1; 655 656 if (I2C_SMBUS_READ == read_write) 657 count = cp2112_read_req(buf, addr, read_length); 658 else 659 count = cp2112_write_req(buf, addr, command, NULL, 660 0); 661 break; 662 case I2C_SMBUS_BYTE_DATA: 663 read_length = 1; 664 665 if (I2C_SMBUS_READ == read_write) 666 count = cp2112_write_read_req(buf, addr, read_length, 667 command, NULL, 0); 668 else 669 count = cp2112_write_req(buf, addr, command, 670 &data->byte, 1); 671 break; 672 case I2C_SMBUS_WORD_DATA: 673 read_length = 2; 674 word = cpu_to_le16(data->word); 675 676 if (I2C_SMBUS_READ == read_write) 677 count = cp2112_write_read_req(buf, addr, read_length, 678 command, NULL, 0); 679 else 680 count = cp2112_write_req(buf, addr, command, 681 (u8 *)&word, 2); 682 break; 683 case I2C_SMBUS_PROC_CALL: 684 size = I2C_SMBUS_WORD_DATA; 685 read_write = I2C_SMBUS_READ; 686 read_length = 2; 687 word = cpu_to_le16(data->word); 688 689 count = cp2112_write_read_req(buf, addr, read_length, command, 690 (u8 *)&word, 2); 691 break; 692 case I2C_SMBUS_I2C_BLOCK_DATA: 693 if (read_write == I2C_SMBUS_READ) { 694 read_length = data->block[0]; 695 count = cp2112_write_read_req(buf, addr, read_length, 696 command, NULL, 0); 697 } else { 698 count = cp2112_write_req(buf, addr, command, 699 data->block + 1, 700 data->block[0]); 701 } 702 break; 703 case I2C_SMBUS_BLOCK_DATA: 704 if (I2C_SMBUS_READ == read_write) { 705 count = cp2112_write_read_req(buf, addr, 706 I2C_SMBUS_BLOCK_MAX, 707 command, NULL, 0); 708 } else { 709 count = cp2112_write_req(buf, addr, command, 710 data->block, 711 data->block[0] + 1); 712 } 713 break; 714 case I2C_SMBUS_BLOCK_PROC_CALL: 715 size = I2C_SMBUS_BLOCK_DATA; 716 read_write = I2C_SMBUS_READ; 717 718 count = cp2112_write_read_req(buf, addr, I2C_SMBUS_BLOCK_MAX, 719 command, data->block, 720 data->block[0] + 1); 721 break; 722 default: 723 hid_warn(hdev, "Unsupported transaction %d\n", size); 724 return -EOPNOTSUPP; 725 } 726 727 if (count < 0) 728 return count; 729 730 ret = hid_hw_power(hdev, PM_HINT_FULLON); 731 if (ret < 0) { 732 hid_err(hdev, "power management error: %d\n", ret); 733 return ret; 734 } 735 736 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); 737 if (ret < 0) { 738 hid_warn(hdev, "Error starting transaction: %d\n", ret); 739 goto power_normal; 740 } 741 742 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { 743 ret = cp2112_xfer_status(dev); 744 if (-EBUSY == ret) 745 continue; 746 if (ret < 0) 747 goto power_normal; 748 break; 749 } 750 751 if (XFER_STATUS_RETRIES <= retries) { 752 hid_warn(hdev, "Transfer timed out, cancelling.\n"); 753 buf[0] = CP2112_CANCEL_TRANSFER; 754 buf[1] = 0x01; 755 756 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); 757 if (ret < 0) 758 hid_warn(hdev, "Error cancelling transaction: %d\n", 759 ret); 760 761 ret = -ETIMEDOUT; 762 goto power_normal; 763 } 764 765 if (I2C_SMBUS_WRITE == read_write) { 766 ret = 0; 767 goto power_normal; 768 } 769 770 if (I2C_SMBUS_BLOCK_DATA == size) 771 read_length = ret; 772 773 ret = cp2112_read(dev, buf, read_length); 774 if (ret < 0) 775 goto power_normal; 776 if (ret != read_length) { 777 hid_warn(hdev, "short read: %d < %zd\n", ret, read_length); 778 ret = -EIO; 779 goto power_normal; 780 } 781 782 switch (size) { 783 case I2C_SMBUS_BYTE: 784 case I2C_SMBUS_BYTE_DATA: 785 data->byte = buf[0]; 786 break; 787 case I2C_SMBUS_WORD_DATA: 788 data->word = le16_to_cpup((__le16 *)buf); 789 break; 790 case I2C_SMBUS_I2C_BLOCK_DATA: 791 if (read_length > I2C_SMBUS_BLOCK_MAX) { 792 ret = -EINVAL; 793 goto power_normal; 794 } 795 796 memcpy(data->block + 1, buf, read_length); 797 break; 798 case I2C_SMBUS_BLOCK_DATA: 799 if (read_length > I2C_SMBUS_BLOCK_MAX) { 800 ret = -EPROTO; 801 goto power_normal; 802 } 803 804 memcpy(data->block, buf, read_length); 805 break; 806 } 807 808 ret = 0; 809 power_normal: 810 hid_hw_power(hdev, PM_HINT_NORMAL); 811 hid_dbg(hdev, "transfer finished: %d\n", ret); 812 return ret; 813 } 814 cp2112_functionality(struct i2c_adapter * adap)815 static u32 cp2112_functionality(struct i2c_adapter *adap) 816 { 817 return I2C_FUNC_I2C | 818 I2C_FUNC_SMBUS_BYTE | 819 I2C_FUNC_SMBUS_BYTE_DATA | 820 I2C_FUNC_SMBUS_WORD_DATA | 821 I2C_FUNC_SMBUS_BLOCK_DATA | 822 I2C_FUNC_SMBUS_I2C_BLOCK | 823 I2C_FUNC_SMBUS_PROC_CALL | 824 I2C_FUNC_SMBUS_BLOCK_PROC_CALL; 825 } 826 827 static const struct i2c_algorithm smbus_algorithm = { 828 .master_xfer = cp2112_i2c_xfer, 829 .smbus_xfer = cp2112_xfer, 830 .functionality = cp2112_functionality, 831 }; 832 cp2112_get_usb_config(struct hid_device * hdev,struct cp2112_usb_config_report * cfg)833 static int cp2112_get_usb_config(struct hid_device *hdev, 834 struct cp2112_usb_config_report *cfg) 835 { 836 int ret; 837 838 ret = cp2112_hid_get(hdev, CP2112_USB_CONFIG, (u8 *)cfg, sizeof(*cfg), 839 HID_FEATURE_REPORT); 840 if (ret != sizeof(*cfg)) { 841 hid_err(hdev, "error reading usb config: %d\n", ret); 842 if (ret < 0) 843 return ret; 844 return -EIO; 845 } 846 847 return 0; 848 } 849 cp2112_set_usb_config(struct hid_device * hdev,struct cp2112_usb_config_report * cfg)850 static int cp2112_set_usb_config(struct hid_device *hdev, 851 struct cp2112_usb_config_report *cfg) 852 { 853 int ret; 854 855 if (WARN_ON(cfg->report != CP2112_USB_CONFIG)) 856 return -EINVAL; 857 858 ret = cp2112_hid_output(hdev, (u8 *)cfg, sizeof(*cfg), 859 HID_FEATURE_REPORT); 860 if (ret != sizeof(*cfg)) { 861 hid_err(hdev, "error writing usb config: %d\n", ret); 862 if (ret < 0) 863 return ret; 864 return -EIO; 865 } 866 867 return 0; 868 } 869 870 static void chmod_sysfs_attrs(struct hid_device *hdev); 871 872 #define CP2112_CONFIG_ATTR(name, store, format, ...) \ 873 static ssize_t name##_store(struct device *kdev, \ 874 struct device_attribute *attr, const char *buf, \ 875 size_t count) \ 876 { \ 877 struct hid_device *hdev = to_hid_device(kdev); \ 878 struct cp2112_usb_config_report cfg; \ 879 int ret = cp2112_get_usb_config(hdev, &cfg); \ 880 if (ret) \ 881 return ret; \ 882 store; \ 883 ret = cp2112_set_usb_config(hdev, &cfg); \ 884 if (ret) \ 885 return ret; \ 886 chmod_sysfs_attrs(hdev); \ 887 return count; \ 888 } \ 889 static ssize_t name##_show(struct device *kdev, \ 890 struct device_attribute *attr, char *buf) \ 891 { \ 892 struct hid_device *hdev = to_hid_device(kdev); \ 893 struct cp2112_usb_config_report cfg; \ 894 int ret = cp2112_get_usb_config(hdev, &cfg); \ 895 if (ret) \ 896 return ret; \ 897 return sysfs_emit(buf, format, ##__VA_ARGS__); \ 898 } \ 899 static DEVICE_ATTR_RW(name); 900 901 CP2112_CONFIG_ATTR(vendor_id, ({ 902 u16 vid; 903 904 if (sscanf(buf, "%hi", &vid) != 1) 905 return -EINVAL; 906 907 cfg.vid = cpu_to_le16(vid); 908 cfg.mask = 0x01; 909 }), "0x%04x\n", le16_to_cpu(cfg.vid)); 910 911 CP2112_CONFIG_ATTR(product_id, ({ 912 u16 pid; 913 914 if (sscanf(buf, "%hi", &pid) != 1) 915 return -EINVAL; 916 917 cfg.pid = cpu_to_le16(pid); 918 cfg.mask = 0x02; 919 }), "0x%04x\n", le16_to_cpu(cfg.pid)); 920 921 CP2112_CONFIG_ATTR(max_power, ({ 922 int mA; 923 924 if (sscanf(buf, "%i", &mA) != 1) 925 return -EINVAL; 926 927 cfg.max_power = (mA + 1) / 2; 928 cfg.mask = 0x04; 929 }), "%u mA\n", cfg.max_power * 2); 930 931 CP2112_CONFIG_ATTR(power_mode, ({ 932 if (sscanf(buf, "%hhi", &cfg.power_mode) != 1) 933 return -EINVAL; 934 935 cfg.mask = 0x08; 936 }), "%u\n", cfg.power_mode); 937 938 CP2112_CONFIG_ATTR(release_version, ({ 939 if (sscanf(buf, "%hhi.%hhi", &cfg.release_major, &cfg.release_minor) 940 != 2) 941 return -EINVAL; 942 943 cfg.mask = 0x10; 944 }), "%u.%u\n", cfg.release_major, cfg.release_minor); 945 946 #undef CP2112_CONFIG_ATTR 947 pstr_store(struct device * kdev,struct device_attribute * kattr,const char * buf,size_t count,int number)948 static ssize_t pstr_store(struct device *kdev, struct device_attribute *kattr, 949 const char *buf, size_t count, int number) 950 { 951 struct hid_device *hdev = to_hid_device(kdev); 952 struct cp2112_string_report report; 953 int ret; 954 955 memset(&report, 0, sizeof(report)); 956 957 ret = utf8s_to_utf16s(buf, count, UTF16_LITTLE_ENDIAN, 958 report.string, ARRAY_SIZE(report.string)); 959 report.report = number; 960 report.length = ret * sizeof(report.string[0]) + 2; 961 report.type = USB_DT_STRING; 962 963 ret = cp2112_hid_output(hdev, &report.report, report.length + 1, 964 HID_FEATURE_REPORT); 965 if (ret != report.length + 1) { 966 hid_err(hdev, "error writing %s string: %d\n", kattr->attr.name, 967 ret); 968 if (ret < 0) 969 return ret; 970 return -EIO; 971 } 972 973 chmod_sysfs_attrs(hdev); 974 return count; 975 } 976 pstr_show(struct device * kdev,struct device_attribute * kattr,char * buf,int number)977 static ssize_t pstr_show(struct device *kdev, struct device_attribute *kattr, 978 char *buf, int number) 979 { 980 struct hid_device *hdev = to_hid_device(kdev); 981 struct cp2112_string_report report; 982 u8 length; 983 int ret; 984 985 ret = cp2112_hid_get(hdev, number, (u8 *)&report.contents, 986 sizeof(report.contents), HID_FEATURE_REPORT); 987 if (ret < 3) { 988 hid_err(hdev, "error reading %s string: %d\n", kattr->attr.name, 989 ret); 990 if (ret < 0) 991 return ret; 992 return -EIO; 993 } 994 995 if (report.length < 2) { 996 hid_err(hdev, "invalid %s string length: %d\n", 997 kattr->attr.name, report.length); 998 return -EIO; 999 } 1000 1001 length = report.length > ret - 1 ? ret - 1 : report.length; 1002 length = (length - 2) / sizeof(report.string[0]); 1003 ret = utf16s_to_utf8s(report.string, length, UTF16_LITTLE_ENDIAN, buf, 1004 PAGE_SIZE - 1); 1005 buf[ret++] = '\n'; 1006 return ret; 1007 } 1008 1009 #define CP2112_PSTR_ATTR(name, _report) \ 1010 static ssize_t name##_store(struct device *kdev, struct device_attribute *kattr, \ 1011 const char *buf, size_t count) \ 1012 { \ 1013 return pstr_store(kdev, kattr, buf, count, _report); \ 1014 } \ 1015 static ssize_t name##_show(struct device *kdev, struct device_attribute *kattr, char *buf) \ 1016 { \ 1017 return pstr_show(kdev, kattr, buf, _report); \ 1018 } \ 1019 static DEVICE_ATTR_RW(name); 1020 1021 CP2112_PSTR_ATTR(manufacturer, CP2112_MANUFACTURER_STRING); 1022 CP2112_PSTR_ATTR(product, CP2112_PRODUCT_STRING); 1023 CP2112_PSTR_ATTR(serial, CP2112_SERIAL_STRING); 1024 1025 #undef CP2112_PSTR_ATTR 1026 1027 static const struct attribute_group cp2112_attr_group = { 1028 .attrs = (struct attribute *[]){ 1029 &dev_attr_vendor_id.attr, 1030 &dev_attr_product_id.attr, 1031 &dev_attr_max_power.attr, 1032 &dev_attr_power_mode.attr, 1033 &dev_attr_release_version.attr, 1034 &dev_attr_manufacturer.attr, 1035 &dev_attr_product.attr, 1036 &dev_attr_serial.attr, 1037 NULL 1038 } 1039 }; 1040 1041 /* Chmoding our sysfs attributes is simply a way to expose which fields in the 1042 * PROM have already been programmed. We do not depend on this preventing 1043 * writing to these attributes since the CP2112 will simply ignore writes to 1044 * already-programmed fields. This is why there is no sense in fixing this 1045 * racy behaviour. 1046 */ chmod_sysfs_attrs(struct hid_device * hdev)1047 static void chmod_sysfs_attrs(struct hid_device *hdev) 1048 { 1049 struct attribute **attr; 1050 u8 buf[2]; 1051 int ret; 1052 1053 ret = cp2112_hid_get(hdev, CP2112_LOCK_BYTE, buf, sizeof(buf), 1054 HID_FEATURE_REPORT); 1055 if (ret != sizeof(buf)) { 1056 hid_err(hdev, "error reading lock byte: %d\n", ret); 1057 return; 1058 } 1059 1060 for (attr = cp2112_attr_group.attrs; *attr; ++attr) { 1061 umode_t mode = (buf[1] & 1) ? 0644 : 0444; 1062 ret = sysfs_chmod_file(&hdev->dev.kobj, *attr, mode); 1063 if (ret < 0) 1064 hid_err(hdev, "error chmoding sysfs file %s\n", 1065 (*attr)->name); 1066 buf[1] >>= 1; 1067 } 1068 } 1069 cp2112_gpio_irq_ack(struct irq_data * d)1070 static void cp2112_gpio_irq_ack(struct irq_data *d) 1071 { 1072 } 1073 cp2112_gpio_irq_mask(struct irq_data * d)1074 static void cp2112_gpio_irq_mask(struct irq_data *d) 1075 { 1076 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1077 struct cp2112_device *dev = gpiochip_get_data(gc); 1078 irq_hw_number_t hwirq = irqd_to_hwirq(d); 1079 1080 __clear_bit(hwirq, &dev->irq_mask); 1081 gpiochip_disable_irq(gc, hwirq); 1082 } 1083 cp2112_gpio_irq_unmask(struct irq_data * d)1084 static void cp2112_gpio_irq_unmask(struct irq_data *d) 1085 { 1086 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1087 struct cp2112_device *dev = gpiochip_get_data(gc); 1088 irq_hw_number_t hwirq = irqd_to_hwirq(d); 1089 1090 gpiochip_enable_irq(gc, hwirq); 1091 __set_bit(hwirq, &dev->irq_mask); 1092 } 1093 cp2112_gpio_poll_callback(struct work_struct * work)1094 static void cp2112_gpio_poll_callback(struct work_struct *work) 1095 { 1096 struct cp2112_device *dev = container_of(work, struct cp2112_device, 1097 gpio_poll_worker.work); 1098 u8 gpio_mask; 1099 u32 irq_type; 1100 int irq, virq, ret; 1101 1102 ret = cp2112_gpio_get_all(&dev->gc); 1103 if (ret == -ENODEV) /* the hardware has been disconnected */ 1104 return; 1105 if (ret < 0) 1106 goto exit; 1107 1108 gpio_mask = ret; 1109 for_each_set_bit(virq, &dev->irq_mask, CP2112_GPIO_MAX_GPIO) { 1110 irq = irq_find_mapping(dev->gc.irq.domain, virq); 1111 if (!irq) 1112 continue; 1113 1114 irq_type = irq_get_trigger_type(irq); 1115 if (!irq_type) 1116 continue; 1117 1118 if (gpio_mask & BIT(virq)) { 1119 /* Level High */ 1120 1121 if (irq_type & IRQ_TYPE_LEVEL_HIGH) 1122 handle_nested_irq(irq); 1123 1124 if ((irq_type & IRQ_TYPE_EDGE_RISING) && 1125 !(dev->gpio_prev_state & BIT(virq))) 1126 handle_nested_irq(irq); 1127 } else { 1128 /* Level Low */ 1129 1130 if (irq_type & IRQ_TYPE_LEVEL_LOW) 1131 handle_nested_irq(irq); 1132 1133 if ((irq_type & IRQ_TYPE_EDGE_FALLING) && 1134 (dev->gpio_prev_state & BIT(virq))) 1135 handle_nested_irq(irq); 1136 } 1137 } 1138 1139 dev->gpio_prev_state = gpio_mask; 1140 1141 exit: 1142 if (dev->gpio_poll) 1143 schedule_delayed_work(&dev->gpio_poll_worker, 10); 1144 } 1145 1146 cp2112_gpio_irq_startup(struct irq_data * d)1147 static unsigned int cp2112_gpio_irq_startup(struct irq_data *d) 1148 { 1149 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1150 struct cp2112_device *dev = gpiochip_get_data(gc); 1151 1152 if (!dev->gpio_poll) { 1153 dev->gpio_poll = true; 1154 schedule_delayed_work(&dev->gpio_poll_worker, 0); 1155 } 1156 1157 cp2112_gpio_irq_unmask(d); 1158 return 0; 1159 } 1160 cp2112_gpio_irq_shutdown(struct irq_data * d)1161 static void cp2112_gpio_irq_shutdown(struct irq_data *d) 1162 { 1163 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 1164 struct cp2112_device *dev = gpiochip_get_data(gc); 1165 1166 cp2112_gpio_irq_mask(d); 1167 1168 if (!dev->irq_mask) { 1169 dev->gpio_poll = false; 1170 cancel_delayed_work_sync(&dev->gpio_poll_worker); 1171 } 1172 } 1173 cp2112_gpio_irq_type(struct irq_data * d,unsigned int type)1174 static int cp2112_gpio_irq_type(struct irq_data *d, unsigned int type) 1175 { 1176 return 0; 1177 } 1178 1179 static const struct irq_chip cp2112_gpio_irqchip = { 1180 .name = "cp2112-gpio", 1181 .irq_startup = cp2112_gpio_irq_startup, 1182 .irq_shutdown = cp2112_gpio_irq_shutdown, 1183 .irq_ack = cp2112_gpio_irq_ack, 1184 .irq_mask = cp2112_gpio_irq_mask, 1185 .irq_unmask = cp2112_gpio_irq_unmask, 1186 .irq_set_type = cp2112_gpio_irq_type, 1187 .flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE, 1188 GPIOCHIP_IRQ_RESOURCE_HELPERS, 1189 }; 1190 cp2112_probe(struct hid_device * hdev,const struct hid_device_id * id)1191 static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id) 1192 { 1193 struct cp2112_device *dev; 1194 u8 buf[3]; 1195 struct cp2112_smbus_config_report config; 1196 struct gpio_irq_chip *girq; 1197 int ret; 1198 1199 dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL); 1200 if (!dev) 1201 return -ENOMEM; 1202 1203 dev->in_out_buffer = devm_kzalloc(&hdev->dev, CP2112_REPORT_MAX_LENGTH, 1204 GFP_KERNEL); 1205 if (!dev->in_out_buffer) 1206 return -ENOMEM; 1207 1208 mutex_init(&dev->lock); 1209 1210 ret = hid_parse(hdev); 1211 if (ret) { 1212 hid_err(hdev, "parse failed\n"); 1213 return ret; 1214 } 1215 1216 ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW); 1217 if (ret) { 1218 hid_err(hdev, "hw start failed\n"); 1219 return ret; 1220 } 1221 1222 ret = hid_hw_open(hdev); 1223 if (ret) { 1224 hid_err(hdev, "hw open failed\n"); 1225 goto err_hid_stop; 1226 } 1227 1228 ret = hid_hw_power(hdev, PM_HINT_FULLON); 1229 if (ret < 0) { 1230 hid_err(hdev, "power management error: %d\n", ret); 1231 goto err_hid_close; 1232 } 1233 1234 ret = cp2112_hid_get(hdev, CP2112_GET_VERSION_INFO, buf, sizeof(buf), 1235 HID_FEATURE_REPORT); 1236 if (ret != sizeof(buf)) { 1237 hid_err(hdev, "error requesting version\n"); 1238 if (ret >= 0) 1239 ret = -EIO; 1240 goto err_power_normal; 1241 } 1242 1243 hid_info(hdev, "Part Number: 0x%02X Device Version: 0x%02X\n", 1244 buf[1], buf[2]); 1245 1246 ret = cp2112_hid_get(hdev, CP2112_SMBUS_CONFIG, (u8 *)&config, 1247 sizeof(config), HID_FEATURE_REPORT); 1248 if (ret != sizeof(config)) { 1249 hid_err(hdev, "error requesting SMBus config\n"); 1250 if (ret >= 0) 1251 ret = -EIO; 1252 goto err_power_normal; 1253 } 1254 1255 config.retry_time = cpu_to_be16(1); 1256 1257 ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config), 1258 HID_FEATURE_REPORT); 1259 if (ret != sizeof(config)) { 1260 hid_err(hdev, "error setting SMBus config\n"); 1261 if (ret >= 0) 1262 ret = -EIO; 1263 goto err_power_normal; 1264 } 1265 1266 hid_set_drvdata(hdev, (void *)dev); 1267 dev->hdev = hdev; 1268 dev->adap.owner = THIS_MODULE; 1269 dev->adap.class = I2C_CLASS_HWMON; 1270 dev->adap.algo = &smbus_algorithm; 1271 dev->adap.algo_data = dev; 1272 dev->adap.dev.parent = &hdev->dev; 1273 snprintf(dev->adap.name, sizeof(dev->adap.name), 1274 "CP2112 SMBus Bridge on hidraw%d", 1275 ((struct hidraw *)hdev->hidraw)->minor); 1276 dev->hwversion = buf[2]; 1277 init_waitqueue_head(&dev->wait); 1278 1279 hid_device_io_start(hdev); 1280 ret = i2c_add_adapter(&dev->adap); 1281 hid_device_io_stop(hdev); 1282 1283 if (ret) { 1284 hid_err(hdev, "error registering i2c adapter\n"); 1285 goto err_power_normal; 1286 } 1287 1288 hid_dbg(hdev, "adapter registered\n"); 1289 1290 dev->gc.label = "cp2112_gpio"; 1291 dev->gc.direction_input = cp2112_gpio_direction_input; 1292 dev->gc.direction_output = cp2112_gpio_direction_output; 1293 dev->gc.set = cp2112_gpio_set; 1294 dev->gc.get = cp2112_gpio_get; 1295 dev->gc.base = -1; 1296 dev->gc.ngpio = CP2112_GPIO_MAX_GPIO; 1297 dev->gc.can_sleep = 1; 1298 dev->gc.parent = &hdev->dev; 1299 1300 girq = &dev->gc.irq; 1301 gpio_irq_chip_set_chip(girq, &cp2112_gpio_irqchip); 1302 /* The event comes from the outside so no parent handler */ 1303 girq->parent_handler = NULL; 1304 girq->num_parents = 0; 1305 girq->parents = NULL; 1306 girq->default_type = IRQ_TYPE_NONE; 1307 girq->handler = handle_simple_irq; 1308 girq->threaded = true; 1309 1310 INIT_DELAYED_WORK(&dev->gpio_poll_worker, cp2112_gpio_poll_callback); 1311 1312 ret = gpiochip_add_data(&dev->gc, dev); 1313 if (ret < 0) { 1314 hid_err(hdev, "error registering gpio chip\n"); 1315 goto err_free_i2c; 1316 } 1317 1318 ret = sysfs_create_group(&hdev->dev.kobj, &cp2112_attr_group); 1319 if (ret < 0) { 1320 hid_err(hdev, "error creating sysfs attrs\n"); 1321 goto err_gpiochip_remove; 1322 } 1323 1324 chmod_sysfs_attrs(hdev); 1325 hid_hw_power(hdev, PM_HINT_NORMAL); 1326 1327 return ret; 1328 1329 err_gpiochip_remove: 1330 gpiochip_remove(&dev->gc); 1331 err_free_i2c: 1332 i2c_del_adapter(&dev->adap); 1333 err_power_normal: 1334 hid_hw_power(hdev, PM_HINT_NORMAL); 1335 err_hid_close: 1336 hid_hw_close(hdev); 1337 err_hid_stop: 1338 hid_hw_stop(hdev); 1339 return ret; 1340 } 1341 cp2112_remove(struct hid_device * hdev)1342 static void cp2112_remove(struct hid_device *hdev) 1343 { 1344 struct cp2112_device *dev = hid_get_drvdata(hdev); 1345 1346 sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group); 1347 i2c_del_adapter(&dev->adap); 1348 1349 if (dev->gpio_poll) { 1350 dev->gpio_poll = false; 1351 cancel_delayed_work_sync(&dev->gpio_poll_worker); 1352 } 1353 1354 gpiochip_remove(&dev->gc); 1355 /* i2c_del_adapter has finished removing all i2c devices from our 1356 * adapter. Well behaved devices should no longer call our cp2112_xfer 1357 * and should have waited for any pending calls to finish. It has also 1358 * waited for device_unregister(&adap->dev) to complete. Therefore we 1359 * can safely free our struct cp2112_device. 1360 */ 1361 hid_hw_close(hdev); 1362 hid_hw_stop(hdev); 1363 } 1364 cp2112_raw_event(struct hid_device * hdev,struct hid_report * report,u8 * data,int size)1365 static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report, 1366 u8 *data, int size) 1367 { 1368 struct cp2112_device *dev = hid_get_drvdata(hdev); 1369 struct cp2112_xfer_status_report *xfer = (void *)data; 1370 1371 switch (data[0]) { 1372 case CP2112_TRANSFER_STATUS_RESPONSE: 1373 hid_dbg(hdev, "xfer status: %02x %02x %04x %04x\n", 1374 xfer->status0, xfer->status1, 1375 be16_to_cpu(xfer->retries), be16_to_cpu(xfer->length)); 1376 1377 switch (xfer->status0) { 1378 case STATUS0_IDLE: 1379 dev->xfer_status = -EAGAIN; 1380 break; 1381 case STATUS0_BUSY: 1382 dev->xfer_status = -EBUSY; 1383 break; 1384 case STATUS0_COMPLETE: 1385 dev->xfer_status = be16_to_cpu(xfer->length); 1386 break; 1387 case STATUS0_ERROR: 1388 switch (xfer->status1) { 1389 case STATUS1_TIMEOUT_NACK: 1390 case STATUS1_TIMEOUT_BUS: 1391 dev->xfer_status = -ETIMEDOUT; 1392 break; 1393 default: 1394 dev->xfer_status = -EIO; 1395 break; 1396 } 1397 break; 1398 default: 1399 dev->xfer_status = -EINVAL; 1400 break; 1401 } 1402 1403 atomic_set(&dev->xfer_avail, 1); 1404 break; 1405 case CP2112_DATA_READ_RESPONSE: 1406 hid_dbg(hdev, "read response: %02x %02x\n", data[1], data[2]); 1407 1408 dev->read_length = data[2]; 1409 if (dev->read_length > sizeof(dev->read_data)) 1410 dev->read_length = sizeof(dev->read_data); 1411 1412 memcpy(dev->read_data, &data[3], dev->read_length); 1413 atomic_set(&dev->read_avail, 1); 1414 break; 1415 default: 1416 hid_err(hdev, "unknown report\n"); 1417 1418 return 0; 1419 } 1420 1421 wake_up_interruptible(&dev->wait); 1422 return 1; 1423 } 1424 1425 static struct hid_driver cp2112_driver = { 1426 .name = "cp2112", 1427 .id_table = cp2112_devices, 1428 .probe = cp2112_probe, 1429 .remove = cp2112_remove, 1430 .raw_event = cp2112_raw_event, 1431 }; 1432 1433 module_hid_driver(cp2112_driver); 1434 MODULE_DESCRIPTION("Silicon Labs HID USB to SMBus master bridge"); 1435 MODULE_AUTHOR("David Barksdale <dbarksdale@uplogix.com>"); 1436 MODULE_LICENSE("GPL"); 1437 1438