1437 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * hid-cp2112.c - Silicon Labs HID USB to SMBus master bridge4 * 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 an10 * SMBus controller for talking to slave devices and 8 GPIO pins. The11 * host communicates with the CP2112 via raw HID reports.12 *13 * Data Sheet:14 * https://www.silabs.com/Support%20Documents/TechnicalDocs/CP2112.pdf15 * Programming Interface Specification:16 * https://www.silabs.com/documents/public/application-notes/an495-cp2112-interface-specification.pdf17 */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 6431#define CP2112_GPIO_CONFIG_LENGTH 532#define CP2112_GPIO_GET_LENGTH 233#define CP2112_GPIO_SET_LENGTH 334#define CP2112_GPIO_MAX_GPIO 835#define CP2112_GPIO_ALL_GPIO_MASK GENMASK(7, 0)36 37enum {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 58enum {59 STATUS0_IDLE = 0x00,60 STATUS0_BUSY = 0x01,61 STATUS0_COMPLETE = 0x02,62 STATUS0_ERROR = 0x03,63};64 65enum {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 74struct 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 85struct 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 powered91 0x01 = self powered & regulator off92 0x02 = self powered & regulator on */93 u8 release_major;94 u8 release_minor;95 u8 mask; /* What fields to program */96} __packed;97 98struct cp2112_read_req_report {99 u8 report; /* CP2112_DATA_READ_REQUEST */100 u8 slave_address;101 __be16 length;102} __packed;103 104struct 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 112struct 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 119struct cp2112_force_read_report {120 u8 report; /* CP2112_DATA_READ_FORCE_SEND */121 __be16 length;122} __packed;123 124struct 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 132struct 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 a143 transfer to complete. This may need to be changed if SMBUS clock, retries,144 or read/write/scl_low timeout settings are changed. */145static const int XFER_STATUS_RETRIES = 10;146 147/* Time in ms to wait for a CP2112_DATA_READ_RESPONSE or148 CP2112_TRANSFER_STATUS_RESPONSE. */149static const int RESPONSE_TIMEOUT = 50;150 151static const struct hid_device_id cp2112_devices[] = {152 { HID_USB_DEVICE(USB_VENDOR_ID_CYGNAL, USB_DEVICE_ID_CYGNAL_CP2112) },153 { }154};155MODULE_DEVICE_TABLE(hid, cp2112_devices);156 157struct 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 177static int gpio_push_pull = CP2112_GPIO_ALL_GPIO_MASK;178module_param(gpio_push_pull, int, 0644);179MODULE_PARM_DESC(gpio_push_pull, "GPIO push-pull configuration bitmask");180 181static 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 215exit:216 mutex_unlock(&dev->lock);217 return ret;218}219 220static 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 242static 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 262exit:263 mutex_unlock(&dev->lock);264 265 return ret;266}267 268static 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 279static 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. 4.4313 */314 cp2112_gpio_set(chip, offset, value);315 316 return 0;317 318fail:319 mutex_unlock(&dev->lock);320 return ret < 0 ? ret : -EIO;321}322 323static 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 340static 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 else353 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 360static 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 a365 * CP2112_DATA_READ_FORCE_SEND and we are waiting for the response to366 * come in cp2112_raw_event or timeout. There will only be one of these367 * in flight at any one time. The timeout is extremely large and is a368 * last resort if the CP2112 has died. If we do timeout we don't expect369 * to receive the response which would cause data races, it's not like370 * 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 383static 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 406static 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 440static 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 453static 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 > 512459 || 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 471static 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 487static 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 502static 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 520static 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 our615 * buffer. Nevertheless, we return an error616 * because something is seriously wrong and617 * 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 629power_normal:630 hid_hw_power(hdev, PM_HINT_NORMAL);631 hid_dbg(hdev, "I2C transfer finished: %d\n", ret);632 return ret;633}634 635static 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 else659 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 else669 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 else680 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;809power_normal:810 hid_hw_power(hdev, PM_HINT_NORMAL);811 hid_dbg(hdev, "transfer finished: %d\n", ret);812 return ret;813}814 815static 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 827static const struct i2c_algorithm smbus_algorithm = {828 .master_xfer = cp2112_i2c_xfer,829 .smbus_xfer = cp2112_xfer,830 .functionality = cp2112_functionality,831};832 833static 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 850static int cp2112_set_usb_config(struct hid_device *hdev,851 struct cp2112_usb_config_report *cfg)852{853 int ret;854 855 BUG_ON(cfg->report != CP2112_USB_CONFIG);856 857 ret = cp2112_hid_output(hdev, (u8 *)cfg, sizeof(*cfg),858 HID_FEATURE_REPORT);859 if (ret != sizeof(*cfg)) {860 hid_err(hdev, "error writing usb config: %d\n", ret);861 if (ret < 0)862 return ret;863 return -EIO;864 }865 866 return 0;867}868 869static void chmod_sysfs_attrs(struct hid_device *hdev);870 871#define CP2112_CONFIG_ATTR(name, store, format, ...) \872static ssize_t name##_store(struct device *kdev, \873 struct device_attribute *attr, const char *buf, \874 size_t count) \875{ \876 struct hid_device *hdev = to_hid_device(kdev); \877 struct cp2112_usb_config_report cfg; \878 int ret = cp2112_get_usb_config(hdev, &cfg); \879 if (ret) \880 return ret; \881 store; \882 ret = cp2112_set_usb_config(hdev, &cfg); \883 if (ret) \884 return ret; \885 chmod_sysfs_attrs(hdev); \886 return count; \887} \888static ssize_t name##_show(struct device *kdev, \889 struct device_attribute *attr, char *buf) \890{ \891 struct hid_device *hdev = to_hid_device(kdev); \892 struct cp2112_usb_config_report cfg; \893 int ret = cp2112_get_usb_config(hdev, &cfg); \894 if (ret) \895 return ret; \896 return sysfs_emit(buf, format, ##__VA_ARGS__); \897} \898static DEVICE_ATTR_RW(name);899 900CP2112_CONFIG_ATTR(vendor_id, ({901 u16 vid;902 903 if (sscanf(buf, "%hi", &vid) != 1)904 return -EINVAL;905 906 cfg.vid = cpu_to_le16(vid);907 cfg.mask = 0x01;908}), "0x%04x\n", le16_to_cpu(cfg.vid));909 910CP2112_CONFIG_ATTR(product_id, ({911 u16 pid;912 913 if (sscanf(buf, "%hi", &pid) != 1)914 return -EINVAL;915 916 cfg.pid = cpu_to_le16(pid);917 cfg.mask = 0x02;918}), "0x%04x\n", le16_to_cpu(cfg.pid));919 920CP2112_CONFIG_ATTR(max_power, ({921 int mA;922 923 if (sscanf(buf, "%i", &mA) != 1)924 return -EINVAL;925 926 cfg.max_power = (mA + 1) / 2;927 cfg.mask = 0x04;928}), "%u mA\n", cfg.max_power * 2);929 930CP2112_CONFIG_ATTR(power_mode, ({931 if (sscanf(buf, "%hhi", &cfg.power_mode) != 1)932 return -EINVAL;933 934 cfg.mask = 0x08;935}), "%u\n", cfg.power_mode);936 937CP2112_CONFIG_ATTR(release_version, ({938 if (sscanf(buf, "%hhi.%hhi", &cfg.release_major, &cfg.release_minor)939 != 2)940 return -EINVAL;941 942 cfg.mask = 0x10;943}), "%u.%u\n", cfg.release_major, cfg.release_minor);944 945#undef CP2112_CONFIG_ATTR946 947static ssize_t pstr_store(struct device *kdev, struct device_attribute *kattr,948 const char *buf, size_t count, int number)949{950 struct hid_device *hdev = to_hid_device(kdev);951 struct cp2112_string_report report;952 int ret;953 954 memset(&report, 0, sizeof(report));955 956 ret = utf8s_to_utf16s(buf, count, UTF16_LITTLE_ENDIAN,957 report.string, ARRAY_SIZE(report.string));958 report.report = number;959 report.length = ret * sizeof(report.string[0]) + 2;960 report.type = USB_DT_STRING;961 962 ret = cp2112_hid_output(hdev, &report.report, report.length + 1,963 HID_FEATURE_REPORT);964 if (ret != report.length + 1) {965 hid_err(hdev, "error writing %s string: %d\n", kattr->attr.name,966 ret);967 if (ret < 0)968 return ret;969 return -EIO;970 }971 972 chmod_sysfs_attrs(hdev);973 return count;974}975 976static ssize_t pstr_show(struct device *kdev, struct device_attribute *kattr,977 char *buf, int number)978{979 struct hid_device *hdev = to_hid_device(kdev);980 struct cp2112_string_report report;981 u8 length;982 int ret;983 984 ret = cp2112_hid_get(hdev, number, (u8 *)&report.contents,985 sizeof(report.contents), HID_FEATURE_REPORT);986 if (ret < 3) {987 hid_err(hdev, "error reading %s string: %d\n", kattr->attr.name,988 ret);989 if (ret < 0)990 return ret;991 return -EIO;992 }993 994 if (report.length < 2) {995 hid_err(hdev, "invalid %s string length: %d\n",996 kattr->attr.name, report.length);997 return -EIO;998 }999 1000 length = report.length > ret - 1 ? ret - 1 : report.length;1001 length = (length - 2) / sizeof(report.string[0]);1002 ret = utf16s_to_utf8s(report.string, length, UTF16_LITTLE_ENDIAN, buf,1003 PAGE_SIZE - 1);1004 buf[ret++] = '\n';1005 return ret;1006}1007 1008#define CP2112_PSTR_ATTR(name, _report) \1009static ssize_t name##_store(struct device *kdev, struct device_attribute *kattr, \1010 const char *buf, size_t count) \1011{ \1012 return pstr_store(kdev, kattr, buf, count, _report); \1013} \1014static ssize_t name##_show(struct device *kdev, struct device_attribute *kattr, char *buf) \1015{ \1016 return pstr_show(kdev, kattr, buf, _report); \1017} \1018static DEVICE_ATTR_RW(name);1019 1020CP2112_PSTR_ATTR(manufacturer, CP2112_MANUFACTURER_STRING);1021CP2112_PSTR_ATTR(product, CP2112_PRODUCT_STRING);1022CP2112_PSTR_ATTR(serial, CP2112_SERIAL_STRING);1023 1024#undef CP2112_PSTR_ATTR1025 1026static const struct attribute_group cp2112_attr_group = {1027 .attrs = (struct attribute *[]){1028 &dev_attr_vendor_id.attr,1029 &dev_attr_product_id.attr,1030 &dev_attr_max_power.attr,1031 &dev_attr_power_mode.attr,1032 &dev_attr_release_version.attr,1033 &dev_attr_manufacturer.attr,1034 &dev_attr_product.attr,1035 &dev_attr_serial.attr,1036 NULL1037 }1038};1039 1040/* Chmoding our sysfs attributes is simply a way to expose which fields in the1041 * PROM have already been programmed. We do not depend on this preventing1042 * writing to these attributes since the CP2112 will simply ignore writes to1043 * already-programmed fields. This is why there is no sense in fixing this1044 * racy behaviour.1045 */1046static void chmod_sysfs_attrs(struct hid_device *hdev)1047{1048 struct attribute **attr;1049 u8 buf[2];1050 int ret;1051 1052 ret = cp2112_hid_get(hdev, CP2112_LOCK_BYTE, buf, sizeof(buf),1053 HID_FEATURE_REPORT);1054 if (ret != sizeof(buf)) {1055 hid_err(hdev, "error reading lock byte: %d\n", ret);1056 return;1057 }1058 1059 for (attr = cp2112_attr_group.attrs; *attr; ++attr) {1060 umode_t mode = (buf[1] & 1) ? 0644 : 0444;1061 ret = sysfs_chmod_file(&hdev->dev.kobj, *attr, mode);1062 if (ret < 0)1063 hid_err(hdev, "error chmoding sysfs file %s\n",1064 (*attr)->name);1065 buf[1] >>= 1;1066 }1067}1068 1069static void cp2112_gpio_irq_ack(struct irq_data *d)1070{1071}1072 1073static void cp2112_gpio_irq_mask(struct irq_data *d)1074{1075 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);1076 struct cp2112_device *dev = gpiochip_get_data(gc);1077 irq_hw_number_t hwirq = irqd_to_hwirq(d);1078 1079 __clear_bit(hwirq, &dev->irq_mask);1080 gpiochip_disable_irq(gc, hwirq);1081}1082 1083static void cp2112_gpio_irq_unmask(struct irq_data *d)1084{1085 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);1086 struct cp2112_device *dev = gpiochip_get_data(gc);1087 irq_hw_number_t hwirq = irqd_to_hwirq(d);1088 1089 gpiochip_enable_irq(gc, hwirq);1090 __set_bit(hwirq, &dev->irq_mask);1091}1092 1093static void cp2112_gpio_poll_callback(struct work_struct *work)1094{1095 struct cp2112_device *dev = container_of(work, struct cp2112_device,1096 gpio_poll_worker.work);1097 u8 gpio_mask;1098 u32 irq_type;1099 int irq, virq, ret;1100 1101 ret = cp2112_gpio_get_all(&dev->gc);1102 if (ret == -ENODEV) /* the hardware has been disconnected */1103 return;1104 if (ret < 0)1105 goto exit;1106 1107 gpio_mask = ret;1108 for_each_set_bit(virq, &dev->irq_mask, CP2112_GPIO_MAX_GPIO) {1109 irq = irq_find_mapping(dev->gc.irq.domain, virq);1110 if (!irq)1111 continue;1112 1113 irq_type = irq_get_trigger_type(irq);1114 if (!irq_type)1115 continue;1116 1117 if (gpio_mask & BIT(virq)) {1118 /* Level High */1119 1120 if (irq_type & IRQ_TYPE_LEVEL_HIGH)1121 handle_nested_irq(irq);1122 1123 if ((irq_type & IRQ_TYPE_EDGE_RISING) &&1124 !(dev->gpio_prev_state & BIT(virq)))1125 handle_nested_irq(irq);1126 } else {1127 /* Level Low */1128 1129 if (irq_type & IRQ_TYPE_LEVEL_LOW)1130 handle_nested_irq(irq);1131 1132 if ((irq_type & IRQ_TYPE_EDGE_FALLING) &&1133 (dev->gpio_prev_state & BIT(virq)))1134 handle_nested_irq(irq);1135 }1136 }1137 1138 dev->gpio_prev_state = gpio_mask;1139 1140exit:1141 if (dev->gpio_poll)1142 schedule_delayed_work(&dev->gpio_poll_worker, 10);1143}1144 1145 1146static unsigned int cp2112_gpio_irq_startup(struct irq_data *d)1147{1148 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);1149 struct cp2112_device *dev = gpiochip_get_data(gc);1150 1151 if (!dev->gpio_poll) {1152 dev->gpio_poll = true;1153 schedule_delayed_work(&dev->gpio_poll_worker, 0);1154 }1155 1156 cp2112_gpio_irq_unmask(d);1157 return 0;1158}1159 1160static void cp2112_gpio_irq_shutdown(struct irq_data *d)1161{1162 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);1163 struct cp2112_device *dev = gpiochip_get_data(gc);1164 1165 cp2112_gpio_irq_mask(d);1166 1167 if (!dev->irq_mask) {1168 dev->gpio_poll = false;1169 cancel_delayed_work_sync(&dev->gpio_poll_worker);1170 }1171}1172 1173static int cp2112_gpio_irq_type(struct irq_data *d, unsigned int type)1174{1175 return 0;1176}1177 1178static const struct irq_chip cp2112_gpio_irqchip = {1179 .name = "cp2112-gpio",1180 .irq_startup = cp2112_gpio_irq_startup,1181 .irq_shutdown = cp2112_gpio_irq_shutdown,1182 .irq_ack = cp2112_gpio_irq_ack,1183 .irq_mask = cp2112_gpio_irq_mask,1184 .irq_unmask = cp2112_gpio_irq_unmask,1185 .irq_set_type = cp2112_gpio_irq_type,1186 .flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE,1187 GPIOCHIP_IRQ_RESOURCE_HELPERS,1188};1189 1190static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)1191{1192 struct cp2112_device *dev;1193 u8 buf[3];1194 struct cp2112_smbus_config_report config;1195 struct gpio_irq_chip *girq;1196 int ret;1197 1198 dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL);1199 if (!dev)1200 return -ENOMEM;1201 1202 dev->in_out_buffer = devm_kzalloc(&hdev->dev, CP2112_REPORT_MAX_LENGTH,1203 GFP_KERNEL);1204 if (!dev->in_out_buffer)1205 return -ENOMEM;1206 1207 mutex_init(&dev->lock);1208 1209 ret = hid_parse(hdev);1210 if (ret) {1211 hid_err(hdev, "parse failed\n");1212 return ret;1213 }1214 1215 ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);1216 if (ret) {1217 hid_err(hdev, "hw start failed\n");1218 return ret;1219 }1220 1221 ret = hid_hw_open(hdev);1222 if (ret) {1223 hid_err(hdev, "hw open failed\n");1224 goto err_hid_stop;1225 }1226 1227 ret = hid_hw_power(hdev, PM_HINT_FULLON);1228 if (ret < 0) {1229 hid_err(hdev, "power management error: %d\n", ret);1230 goto err_hid_close;1231 }1232 1233 ret = cp2112_hid_get(hdev, CP2112_GET_VERSION_INFO, buf, sizeof(buf),1234 HID_FEATURE_REPORT);1235 if (ret != sizeof(buf)) {1236 hid_err(hdev, "error requesting version\n");1237 if (ret >= 0)1238 ret = -EIO;1239 goto err_power_normal;1240 }1241 1242 hid_info(hdev, "Part Number: 0x%02X Device Version: 0x%02X\n",1243 buf[1], buf[2]);1244 1245 ret = cp2112_hid_get(hdev, CP2112_SMBUS_CONFIG, (u8 *)&config,1246 sizeof(config), HID_FEATURE_REPORT);1247 if (ret != sizeof(config)) {1248 hid_err(hdev, "error requesting SMBus config\n");1249 if (ret >= 0)1250 ret = -EIO;1251 goto err_power_normal;1252 }1253 1254 config.retry_time = cpu_to_be16(1);1255 1256 ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config),1257 HID_FEATURE_REPORT);1258 if (ret != sizeof(config)) {1259 hid_err(hdev, "error setting SMBus config\n");1260 if (ret >= 0)1261 ret = -EIO;1262 goto err_power_normal;1263 }1264 1265 hid_set_drvdata(hdev, (void *)dev);1266 dev->hdev = hdev;1267 dev->adap.owner = THIS_MODULE;1268 dev->adap.class = I2C_CLASS_HWMON;1269 dev->adap.algo = &smbus_algorithm;1270 dev->adap.algo_data = dev;1271 dev->adap.dev.parent = &hdev->dev;1272 snprintf(dev->adap.name, sizeof(dev->adap.name),1273 "CP2112 SMBus Bridge on hidraw%d",1274 ((struct hidraw *)hdev->hidraw)->minor);1275 dev->hwversion = buf[2];1276 init_waitqueue_head(&dev->wait);1277 1278 hid_device_io_start(hdev);1279 ret = i2c_add_adapter(&dev->adap);1280 hid_device_io_stop(hdev);1281 1282 if (ret) {1283 hid_err(hdev, "error registering i2c adapter\n");1284 goto err_power_normal;1285 }1286 1287 hid_dbg(hdev, "adapter registered\n");1288 1289 dev->gc.label = "cp2112_gpio";1290 dev->gc.direction_input = cp2112_gpio_direction_input;1291 dev->gc.direction_output = cp2112_gpio_direction_output;1292 dev->gc.set = cp2112_gpio_set;1293 dev->gc.get = cp2112_gpio_get;1294 dev->gc.base = -1;1295 dev->gc.ngpio = CP2112_GPIO_MAX_GPIO;1296 dev->gc.can_sleep = 1;1297 dev->gc.parent = &hdev->dev;1298 1299 girq = &dev->gc.irq;1300 gpio_irq_chip_set_chip(girq, &cp2112_gpio_irqchip);1301 /* The event comes from the outside so no parent handler */1302 girq->parent_handler = NULL;1303 girq->num_parents = 0;1304 girq->parents = NULL;1305 girq->default_type = IRQ_TYPE_NONE;1306 girq->handler = handle_simple_irq;1307 girq->threaded = true;1308 1309 INIT_DELAYED_WORK(&dev->gpio_poll_worker, cp2112_gpio_poll_callback);1310 1311 ret = gpiochip_add_data(&dev->gc, dev);1312 if (ret < 0) {1313 hid_err(hdev, "error registering gpio chip\n");1314 goto err_free_i2c;1315 }1316 1317 ret = sysfs_create_group(&hdev->dev.kobj, &cp2112_attr_group);1318 if (ret < 0) {1319 hid_err(hdev, "error creating sysfs attrs\n");1320 goto err_gpiochip_remove;1321 }1322 1323 chmod_sysfs_attrs(hdev);1324 hid_hw_power(hdev, PM_HINT_NORMAL);1325 1326 return ret;1327 1328err_gpiochip_remove:1329 gpiochip_remove(&dev->gc);1330err_free_i2c:1331 i2c_del_adapter(&dev->adap);1332err_power_normal:1333 hid_hw_power(hdev, PM_HINT_NORMAL);1334err_hid_close:1335 hid_hw_close(hdev);1336err_hid_stop:1337 hid_hw_stop(hdev);1338 return ret;1339}1340 1341static void cp2112_remove(struct hid_device *hdev)1342{1343 struct cp2112_device *dev = hid_get_drvdata(hdev);1344 1345 sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group);1346 i2c_del_adapter(&dev->adap);1347 1348 if (dev->gpio_poll) {1349 dev->gpio_poll = false;1350 cancel_delayed_work_sync(&dev->gpio_poll_worker);1351 }1352 1353 gpiochip_remove(&dev->gc);1354 /* i2c_del_adapter has finished removing all i2c devices from our1355 * adapter. Well behaved devices should no longer call our cp2112_xfer1356 * and should have waited for any pending calls to finish. It has also1357 * waited for device_unregister(&adap->dev) to complete. Therefore we1358 * can safely free our struct cp2112_device.1359 */1360 hid_hw_close(hdev);1361 hid_hw_stop(hdev);1362}1363 1364static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report,1365 u8 *data, int size)1366{1367 struct cp2112_device *dev = hid_get_drvdata(hdev);1368 struct cp2112_xfer_status_report *xfer = (void *)data;1369 1370 switch (data[0]) {1371 case CP2112_TRANSFER_STATUS_RESPONSE:1372 hid_dbg(hdev, "xfer status: %02x %02x %04x %04x\n",1373 xfer->status0, xfer->status1,1374 be16_to_cpu(xfer->retries), be16_to_cpu(xfer->length));1375 1376 switch (xfer->status0) {1377 case STATUS0_IDLE:1378 dev->xfer_status = -EAGAIN;1379 break;1380 case STATUS0_BUSY:1381 dev->xfer_status = -EBUSY;1382 break;1383 case STATUS0_COMPLETE:1384 dev->xfer_status = be16_to_cpu(xfer->length);1385 break;1386 case STATUS0_ERROR:1387 switch (xfer->status1) {1388 case STATUS1_TIMEOUT_NACK:1389 case STATUS1_TIMEOUT_BUS:1390 dev->xfer_status = -ETIMEDOUT;1391 break;1392 default:1393 dev->xfer_status = -EIO;1394 break;1395 }1396 break;1397 default:1398 dev->xfer_status = -EINVAL;1399 break;1400 }1401 1402 atomic_set(&dev->xfer_avail, 1);1403 break;1404 case CP2112_DATA_READ_RESPONSE:1405 hid_dbg(hdev, "read response: %02x %02x\n", data[1], data[2]);1406 1407 dev->read_length = data[2];1408 if (dev->read_length > sizeof(dev->read_data))1409 dev->read_length = sizeof(dev->read_data);1410 1411 memcpy(dev->read_data, &data[3], dev->read_length);1412 atomic_set(&dev->read_avail, 1);1413 break;1414 default:1415 hid_err(hdev, "unknown report\n");1416 1417 return 0;1418 }1419 1420 wake_up_interruptible(&dev->wait);1421 return 1;1422}1423 1424static struct hid_driver cp2112_driver = {1425 .name = "cp2112",1426 .id_table = cp2112_devices,1427 .probe = cp2112_probe,1428 .remove = cp2112_remove,1429 .raw_event = cp2112_raw_event,1430};1431 1432module_hid_driver(cp2112_driver);1433MODULE_DESCRIPTION("Silicon Labs HID USB to SMBus master bridge");1434MODULE_AUTHOR("David Barksdale <dbarksdale@uplogix.com>");1435MODULE_LICENSE("GPL");1436 1437