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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid
[linux-block.git] / drivers / hid / hid-cp2112.c
CommitLineData
2025cf9e 1// SPDX-License-Identifier: GPL-2.0-only
e932d817
DB		 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>
e932d817
DB		 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 * http://www.silabs.com/Support%20Documents/TechnicalDocs/CP2112.pdf
15 * Programming Interface Specification:
ce4dd820 16 * https://www.silabs.com/documents/public/application-notes/an495-cp2112-interface-specification.pdf
e932d817
DB		 17 */
18
13de9cca 19#include <linux/gpio.h>
47513c2f 20#include <linux/gpio/driver.h>
e932d817 21#include <linux/hid.h>
42cb6b35 22#include <linux/hidraw.h>
e932d817
DB		 23#include <linux/i2c.h>
24#include <linux/module.h>
25#include <linux/nls.h>
26#include <linux/usb/ch9.h>
27#include "hid-ids.h"
28
1ffb3c40
BT		 29#define CP2112_REPORT_MAX_LENGTH 64
30#define CP2112_GPIO_CONFIG_LENGTH 5
31#define CP2112_GPIO_GET_LENGTH 2
32#define CP2112_GPIO_SET_LENGTH 3
33
e932d817
DB		 34enum {
35 CP2112_GPIO_CONFIG = 0x02,
36 CP2112_GPIO_GET = 0x03,
37 CP2112_GPIO_SET = 0x04,
38 CP2112_GET_VERSION_INFO = 0x05,
39 CP2112_SMBUS_CONFIG = 0x06,
40 CP2112_DATA_READ_REQUEST = 0x10,
41 CP2112_DATA_WRITE_READ_REQUEST = 0x11,
42 CP2112_DATA_READ_FORCE_SEND = 0x12,
43 CP2112_DATA_READ_RESPONSE = 0x13,
44 CP2112_DATA_WRITE_REQUEST = 0x14,
45 CP2112_TRANSFER_STATUS_REQUEST = 0x15,
46 CP2112_TRANSFER_STATUS_RESPONSE = 0x16,
47 CP2112_CANCEL_TRANSFER = 0x17,
48 CP2112_LOCK_BYTE = 0x20,
49 CP2112_USB_CONFIG = 0x21,
50 CP2112_MANUFACTURER_STRING = 0x22,
51 CP2112_PRODUCT_STRING = 0x23,
52 CP2112_SERIAL_STRING = 0x24,
53};
54
55enum {
56 STATUS0_IDLE = 0x00,
57 STATUS0_BUSY = 0x01,
58 STATUS0_COMPLETE = 0x02,
59 STATUS0_ERROR = 0x03,
60};
61
62enum {
63 STATUS1_TIMEOUT_NACK = 0x00,
64 STATUS1_TIMEOUT_BUS = 0x01,
65 STATUS1_ARBITRATION_LOST = 0x02,
66 STATUS1_READ_INCOMPLETE = 0x03,
67 STATUS1_WRITE_INCOMPLETE = 0x04,
68 STATUS1_SUCCESS = 0x05,
69};
70
71struct cp2112_smbus_config_report {
72 u8 report; /* CP2112_SMBUS_CONFIG */
73 __be32 clock_speed; /* Hz */
74 u8 device_address; /* Stored in the upper 7 bits */
75 u8 auto_send_read; /* 1 = enabled, 0 = disabled */
76 __be16 write_timeout; /* ms, 0 = no timeout */
77 __be16 read_timeout; /* ms, 0 = no timeout */
78 u8 scl_low_timeout; /* 1 = enabled, 0 = disabled */
79 __be16 retry_time; /* # of retries, 0 = no limit */
80} __packed;
81
82struct cp2112_usb_config_report {
83 u8 report; /* CP2112_USB_CONFIG */
84 __le16 vid; /* Vendor ID */
85 __le16 pid; /* Product ID */
86 u8 max_power; /* Power requested in 2mA units */
87 u8 power_mode; /* 0x00 = bus powered
88 0x01 = self powered & regulator off
89 0x02 = self powered & regulator on */
90 u8 release_major;
91 u8 release_minor;
92 u8 mask; /* What fields to program */
93} __packed;
94
95struct cp2112_read_req_report {
96 u8 report; /* CP2112_DATA_READ_REQUEST */
97 u8 slave_address;
98 __be16 length;
99} __packed;
100
101struct cp2112_write_read_req_report {
102 u8 report; /* CP2112_DATA_WRITE_READ_REQUEST */
103 u8 slave_address;
104 __be16 length;
105 u8 target_address_length;
106 u8 target_address[16];
107} __packed;
108
109struct cp2112_write_req_report {
110 u8 report; /* CP2112_DATA_WRITE_REQUEST */
111 u8 slave_address;
112 u8 length;
113 u8 data[61];
114} __packed;
115
116struct cp2112_force_read_report {
117 u8 report; /* CP2112_DATA_READ_FORCE_SEND */
118 __be16 length;
119} __packed;
120
121struct cp2112_xfer_status_report {
122 u8 report; /* CP2112_TRANSFER_STATUS_RESPONSE */
123 u8 status0; /* STATUS0_* */
124 u8 status1; /* STATUS1_* */
125 __be16 retries;
126 __be16 length;
127} __packed;
128
129struct cp2112_string_report {
130 u8 dummy; /* force .string to be aligned */
131 u8 report; /* CP2112_*_STRING */
132 u8 length; /* length in bytes of everyting after .report */
133 u8 type; /* USB_DT_STRING */
134 wchar_t string[30]; /* UTF16_LITTLE_ENDIAN string */
135} __packed;
136
137/* Number of times to request transfer status before giving up waiting for a
138 transfer to complete. This may need to be changed if SMBUS clock, retries,
139 or read/write/scl_low timeout settings are changed. */
140static const int XFER_STATUS_RETRIES = 10;
141
142/* Time in ms to wait for a CP2112_DATA_READ_RESPONSE or
143 CP2112_TRANSFER_STATUS_RESPONSE. */
144static const int RESPONSE_TIMEOUT = 50;
145
146static const struct hid_device_id cp2112_devices[] = {
147 { HID_USB_DEVICE(USB_VENDOR_ID_CYGNAL, USB_DEVICE_ID_CYGNAL_CP2112) },
148 { }
149};
150MODULE_DEVICE_TABLE(hid, cp2112_devices);
151
152struct cp2112_device {
153 struct i2c_adapter adap;
154 struct hid_device *hdev;
155 wait_queue_head_t wait;
156 u8 read_data[61];
157 u8 read_length;
44eda784 158 u8 hwversion;
e932d817
DB		 159 int xfer_status;
160 atomic_t read_avail;
161 atomic_t xfer_avail;
162 struct gpio_chip gc;
1ffb3c40 163 u8 *in_out_buffer;
7a7b5df8 164 struct mutex lock;
13de9cca
BT		 165
166 struct gpio_desc *desc[8];
167 bool gpio_poll;
168 struct delayed_work gpio_poll_worker;
169 unsigned long irq_mask;
170 u8 gpio_prev_state;
e932d817
DB		 171};
172
173static int gpio_push_pull = 0xFF;
174module_param(gpio_push_pull, int, S_IRUGO | S_IWUSR);
175MODULE_PARM_DESC(gpio_push_pull, "GPIO push-pull configuration bitmask");
176
177static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
178{
47513c2f 179 struct cp2112_device *dev = gpiochip_get_data(chip);
e932d817 180 struct hid_device *hdev = dev->hdev;
1ffb3c40 181 u8 *buf = dev->in_out_buffer;
e932d817
DB		 182 int ret;
183
7a7b5df8 184 mutex_lock(&dev->lock);
1ffb3c40 185
490051ad 186 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
1ffb3c40
BT		 187 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
188 HID_REQ_GET_REPORT);
189 if (ret != CP2112_GPIO_CONFIG_LENGTH) {
e932d817 190 hid_err(hdev, "error requesting GPIO config: %d\n", ret);
7da85fbf
SS		 191 if (ret >= 0)
192 ret = -EIO;
1ffb3c40 193 goto exit;
e932d817
DB		 194 }
195
196 buf[1] &= ~(1 << offset);
197 buf[2] = gpio_push_pull;
198
1ffb3c40
BT		 199 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
200 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
201 HID_REQ_SET_REPORT);
7da85fbf 202 if (ret != CP2112_GPIO_CONFIG_LENGTH) {
e932d817 203 hid_err(hdev, "error setting GPIO config: %d\n", ret);
7da85fbf
SS		 204 if (ret >= 0)
205 ret = -EIO;
1ffb3c40 206 goto exit;
e932d817
DB		 207 }
208
1ffb3c40
BT		 209 ret = 0;
210
211exit:
7a7b5df8 212 mutex_unlock(&dev->lock);
7da85fbf 213 return ret;
e932d817
DB		 214}
215
216static void cp2112_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
217{
47513c2f 218 struct cp2112_device *dev = gpiochip_get_data(chip);
e932d817 219 struct hid_device *hdev = dev->hdev;
1ffb3c40 220 u8 *buf = dev->in_out_buffer;
e932d817
DB		 221 int ret;
222
7a7b5df8 223 mutex_lock(&dev->lock);
1ffb3c40 224
e932d817
DB		 225 buf[0] = CP2112_GPIO_SET;
226 buf[1] = value ? 0xff : 0;
227 buf[2] = 1 << offset;
228
1ffb3c40
BT		 229 ret = hid_hw_raw_request(hdev, CP2112_GPIO_SET, buf,
230 CP2112_GPIO_SET_LENGTH, HID_FEATURE_REPORT,
231 HID_REQ_SET_REPORT);
e932d817
DB		 232 if (ret < 0)
233 hid_err(hdev, "error setting GPIO values: %d\n", ret);
1ffb3c40 234
7a7b5df8 235 mutex_unlock(&dev->lock);
e932d817
DB		 236}
237
13de9cca 238static int cp2112_gpio_get_all(struct gpio_chip *chip)
e932d817 239{
47513c2f 240 struct cp2112_device *dev = gpiochip_get_data(chip);
e932d817 241 struct hid_device *hdev = dev->hdev;
1ffb3c40 242 u8 *buf = dev->in_out_buffer;
e932d817
DB		 243 int ret;
244
7a7b5df8 245 mutex_lock(&dev->lock);
1ffb3c40
BT		 246
247 ret = hid_hw_raw_request(hdev, CP2112_GPIO_GET, buf,
248 CP2112_GPIO_GET_LENGTH, HID_FEATURE_REPORT,
249 HID_REQ_GET_REPORT);
250 if (ret != CP2112_GPIO_GET_LENGTH) {
e932d817 251 hid_err(hdev, "error requesting GPIO values: %d\n", ret);
1ffb3c40
BT		 252 ret = ret < 0 ? ret : -EIO;
253 goto exit;
e932d817
DB		 254 }
255
13de9cca 256 ret = buf[1];
1ffb3c40
BT		 257
258exit:
7a7b5df8 259 mutex_unlock(&dev->lock);
1ffb3c40
BT		 260
261 return ret;
e932d817
DB		 262}
263
13de9cca
BT		 264static int cp2112_gpio_get(struct gpio_chip *chip, unsigned int offset)
265{
266 int ret;
267
268 ret = cp2112_gpio_get_all(chip);
269 if (ret < 0)
270 return ret;
271
272 return (ret >> offset) & 1;
273}
274
e932d817
DB		 275static int cp2112_gpio_direction_output(struct gpio_chip *chip,
276 unsigned offset, int value)
277{
47513c2f 278 struct cp2112_device *dev = gpiochip_get_data(chip);
e932d817 279 struct hid_device *hdev = dev->hdev;
1ffb3c40 280 u8 *buf = dev->in_out_buffer;
e932d817
DB		 281 int ret;
282
7a7b5df8 283 mutex_lock(&dev->lock);
1ffb3c40 284
490051ad 285 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
1ffb3c40
BT		 286 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
287 HID_REQ_GET_REPORT);
288 if (ret != CP2112_GPIO_CONFIG_LENGTH) {
e932d817 289 hid_err(hdev, "error requesting GPIO config: %d\n", ret);
1ffb3c40 290 goto fail;
e932d817
DB		 291 }
292
293 buf[1] |= 1 << offset;
294 buf[2] = gpio_push_pull;
295
1ffb3c40
BT		 296 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
297 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
298 HID_REQ_SET_REPORT);
e932d817
DB		 299 if (ret < 0) {
300 hid_err(hdev, "error setting GPIO config: %d\n", ret);
1ffb3c40 301 goto fail;
e932d817
DB		 302 }
303
7a7b5df8 304 mutex_unlock(&dev->lock);
1ffb3c40 305
beb9d007
AB		 306 /*
307 * Set gpio value when output direction is already set,
308 * as specified in AN495, Rev. 0.2, cpt. 4.4
309 */
310 cp2112_gpio_set(chip, offset, value);
311
e932d817 312 return 0;
1ffb3c40
BT		 313
314fail:
7a7b5df8 315 mutex_unlock(&dev->lock);
1ffb3c40 316 return ret < 0 ? ret : -EIO;
e932d817
DB		 317}
318
319static int cp2112_hid_get(struct hid_device *hdev, unsigned char report_number,
320 u8 *data, size_t count, unsigned char report_type)
321{
322 u8 *buf;
323 int ret;
324
325 buf = kmalloc(count, GFP_KERNEL);
326 if (!buf)
327 return -ENOMEM;
328
490051ad
JK		 329 ret = hid_hw_raw_request(hdev, report_number, buf, count,
330 report_type, HID_REQ_GET_REPORT);
e932d817
DB		 331 memcpy(data, buf, count);
332 kfree(buf);
333 return ret;
334}
335
336static int cp2112_hid_output(struct hid_device *hdev, u8 *data, size_t count,
337 unsigned char report_type)
338{
339 u8 *buf;
340 int ret;
341
342 buf = kmemdup(data, count, GFP_KERNEL);
343 if (!buf)
344 return -ENOMEM;
345
866e4797
BT		 346 if (report_type == HID_OUTPUT_REPORT)
347 ret = hid_hw_output_report(hdev, buf, count);
348 else
349 ret = hid_hw_raw_request(hdev, buf[0], buf, count, report_type,
350 HID_REQ_SET_REPORT);
351
e932d817
DB		 352 kfree(buf);
353 return ret;
354}
355
356static int cp2112_wait(struct cp2112_device *dev, atomic_t *avail)
357{
358 int ret = 0;
359
360 /* We have sent either a CP2112_TRANSFER_STATUS_REQUEST or a
361 * CP2112_DATA_READ_FORCE_SEND and we are waiting for the response to
362 * come in cp2112_raw_event or timeout. There will only be one of these
363 * in flight at any one time. The timeout is extremely large and is a
364 * last resort if the CP2112 has died. If we do timeout we don't expect
365 * to receive the response which would cause data races, it's not like
366 * we can do anything about it anyway.
367 */
368 ret = wait_event_interruptible_timeout(dev->wait,
369 atomic_read(avail), msecs_to_jiffies(RESPONSE_TIMEOUT));
370 if (-ERESTARTSYS == ret)
371 return ret;
372 if (!ret)
373 return -ETIMEDOUT;
374
375 atomic_set(avail, 0);
376 return 0;
377}
378
379static int cp2112_xfer_status(struct cp2112_device *dev)
380{
381 struct hid_device *hdev = dev->hdev;
382 u8 buf[2];
383 int ret;
384
385 buf[0] = CP2112_TRANSFER_STATUS_REQUEST;
386 buf[1] = 0x01;
387 atomic_set(&dev->xfer_avail, 0);
388
389 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT);
390 if (ret < 0) {
391 hid_warn(hdev, "Error requesting status: %d\n", ret);
392 return ret;
393 }
394
395 ret = cp2112_wait(dev, &dev->xfer_avail);
396 if (ret)
397 return ret;
398
399 return dev->xfer_status;
400}
401
402static int cp2112_read(struct cp2112_device *dev, u8 *data, size_t size)
403{
404 struct hid_device *hdev = dev->hdev;
405 struct cp2112_force_read_report report;
406 int ret;
407
6debce6f
AB		 408 if (size > sizeof(dev->read_data))
409 size = sizeof(dev->read_data);
e932d817
DB		 410 report.report = CP2112_DATA_READ_FORCE_SEND;
411 report.length = cpu_to_be16(size);
412
413 atomic_set(&dev->read_avail, 0);
414
415 ret = cp2112_hid_output(hdev, &report.report, sizeof(report),
416 HID_OUTPUT_REPORT);
417 if (ret < 0) {
418 hid_warn(hdev, "Error requesting data: %d\n", ret);
419 return ret;
420 }
421
422 ret = cp2112_wait(dev, &dev->read_avail);
423 if (ret)
424 return ret;
425
5a673fce 426 hid_dbg(hdev, "read %d of %zd bytes requested\n",
e932d817
DB		 427 dev->read_length, size);
428
429 if (size > dev->read_length)
430 size = dev->read_length;
431
432 memcpy(data, dev->read_data, size);
433 return dev->read_length;
434}
435
436static int cp2112_read_req(void *buf, u8 slave_address, u16 length)
437{
438 struct cp2112_read_req_report *report = buf;
439
440 if (length < 1 || length > 512)
441 return -EINVAL;
442
443 report->report = CP2112_DATA_READ_REQUEST;
444 report->slave_address = slave_address << 1;
445 report->length = cpu_to_be16(length);
446 return sizeof(*report);
447}
448
449static int cp2112_write_read_req(void *buf, u8 slave_address, u16 length,
450 u8 command, u8 *data, u8 data_length)
451{
452 struct cp2112_write_read_req_report *report = buf;
453
454 if (length < 1 || length > 512
455 || data_length > sizeof(report->target_address) - 1)
456 return -EINVAL;
457
458 report->report = CP2112_DATA_WRITE_READ_REQUEST;
459 report->slave_address = slave_address << 1;
460 report->length = cpu_to_be16(length);
461 report->target_address_length = data_length + 1;
462 report->target_address[0] = command;
463 memcpy(&report->target_address[1], data, data_length);
464 return data_length + 6;
465}
466
467static int cp2112_write_req(void *buf, u8 slave_address, u8 command, u8 *data,
468 u8 data_length)
469{
470 struct cp2112_write_req_report *report = buf;
471
472 if (data_length > sizeof(report->data) - 1)
473 return -EINVAL;
474
475 report->report = CP2112_DATA_WRITE_REQUEST;
476 report->slave_address = slave_address << 1;
477 report->length = data_length + 1;
478 report->data[0] = command;
479 memcpy(&report->data[1], data, data_length);
480 return data_length + 4;
481}
482
b9029345
AB		 483static int cp2112_i2c_write_req(void *buf, u8 slave_address, u8 *data,
484 u8 data_length)
485{
486 struct cp2112_write_req_report *report = buf;
487
488 if (data_length > sizeof(report->data))
489 return -EINVAL;
490
491 report->report = CP2112_DATA_WRITE_REQUEST;
492 report->slave_address = slave_address << 1;
493 report->length = data_length;
494 memcpy(report->data, data, data_length);
495 return data_length + 3;
496}
497
44eda784
EW		 498static int cp2112_i2c_write_read_req(void *buf, u8 slave_address,
499 u8 *addr, int addr_length,
500 int read_length)
501{
502 struct cp2112_write_read_req_report *report = buf;
503
504 if (read_length < 1 || read_length > 512 ||
505 addr_length > sizeof(report->target_address))
506 return -EINVAL;
507
508 report->report = CP2112_DATA_WRITE_READ_REQUEST;
509 report->slave_address = slave_address << 1;
510 report->length = cpu_to_be16(read_length);
511 report->target_address_length = addr_length;
512 memcpy(report->target_address, addr, addr_length);
513 return addr_length + 5;
514}
515
b9029345
AB		 516static int cp2112_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
517 int num)
518{
519 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data;
520 struct hid_device *hdev = dev->hdev;
521 u8 buf[64];
522 ssize_t count;
44eda784
EW		 523 ssize_t read_length = 0;
524 u8 *read_buf = NULL;
b9029345
AB		 525 unsigned int retries;
526 int ret;
527
528 hid_dbg(hdev, "I2C %d messages\n", num);
529
44eda784
EW		 530 if (num == 1) {
531 if (msgs->flags & I2C_M_RD) {
532 hid_dbg(hdev, "I2C read %#04x len %d\n",
533 msgs->addr, msgs->len);
534 read_length = msgs->len;
535 read_buf = msgs->buf;
536 count = cp2112_read_req(buf, msgs->addr, msgs->len);
537 } else {
538 hid_dbg(hdev, "I2C write %#04x len %d\n",
539 msgs->addr, msgs->len);
540 count = cp2112_i2c_write_req(buf, msgs->addr,
541 msgs->buf, msgs->len);
542 }
543 if (count < 0)
544 return count;
545 } else if (dev->hwversion > 1 && /* no repeated start in rev 1 */
546 num == 2 &&
547 msgs[0].addr == msgs[1].addr &&
548 !(msgs[0].flags & I2C_M_RD) && (msgs[1].flags & I2C_M_RD)) {
549 hid_dbg(hdev, "I2C write-read %#04x wlen %d rlen %d\n",
550 msgs[0].addr, msgs[0].len, msgs[1].len);
551 read_length = msgs[1].len;
552 read_buf = msgs[1].buf;
553 count = cp2112_i2c_write_read_req(buf, msgs[0].addr,
554 msgs[0].buf, msgs[0].len, msgs[1].len);
555 if (count < 0)
556 return count;
557 } else {
b9029345
AB		 558 hid_err(hdev,
559 "Multi-message I2C transactions not supported\n");
560 return -EOPNOTSUPP;
561 }
562
b9029345
AB		 563 ret = hid_hw_power(hdev, PM_HINT_FULLON);
564 if (ret < 0) {
565 hid_err(hdev, "power management error: %d\n", ret);
566 return ret;
567 }
568
569 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT);
570 if (ret < 0) {
571 hid_warn(hdev, "Error starting transaction: %d\n", ret);
572 goto power_normal;
573 }
574
575 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) {
576 ret = cp2112_xfer_status(dev);
577 if (-EBUSY == ret)
578 continue;
579 if (ret < 0)
580 goto power_normal;
581 break;
582 }
583
584 if (XFER_STATUS_RETRIES <= retries) {
585 hid_warn(hdev, "Transfer timed out, cancelling.\n");
586 buf[0] = CP2112_CANCEL_TRANSFER;
587 buf[1] = 0x01;
588
589 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT);
590 if (ret < 0)
591 hid_warn(hdev, "Error cancelling transaction: %d\n",
592 ret);
593
594 ret = -ETIMEDOUT;
595 goto power_normal;
596 }
597
44eda784
EW		 598 for (count = 0; count < read_length;) {
599 ret = cp2112_read(dev, read_buf + count, read_length - count);
5ddfb12e
EW		 600 if (ret < 0)
601 goto power_normal;
602 if (ret == 0) {
603 hid_err(hdev, "read returned 0\n");
604 ret = -EIO;
605 goto power_normal;
606 }
607 count += ret;
44eda784 608 if (count > read_length) {
5ddfb12e
EW		 609 /*
610 * The hardware returned too much data.
611 * This is mostly harmless because cp2112_read()
612 * has a limit check so didn't overrun our
613 * buffer. Nevertheless, we return an error
614 * because something is seriously wrong and
615 * it shouldn't go unnoticed.
616 */
617 hid_err(hdev, "long read: %d > %zd\n",
44eda784 618 ret, read_length - count + ret);
5ddfb12e
EW		 619 ret = -EIO;
620 goto power_normal;
621 }
b9029345
AB		 622 }
623
b9029345 624 /* return the number of transferred messages */
44eda784 625 ret = num;
b9029345
AB		 626
627power_normal:
628 hid_hw_power(hdev, PM_HINT_NORMAL);
629 hid_dbg(hdev, "I2C transfer finished: %d\n", ret);
630 return ret;
631}
632
e932d817
DB		 633static int cp2112_xfer(struct i2c_adapter *adap, u16 addr,
634 unsigned short flags, char read_write, u8 command,
635 int size, union i2c_smbus_data *data)
636{
637 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data;
638 struct hid_device *hdev = dev->hdev;
639 u8 buf[64];
29e2d6d1 640 __le16 word;
0438ee70 641 ssize_t count;
e932d817
DB		 642 size_t read_length = 0;
643 unsigned int retries;
644 int ret;
645
646 hid_dbg(hdev, "%s addr 0x%x flags 0x%x cmd 0x%x size %d\n",
647 read_write == I2C_SMBUS_WRITE ? "write" : "read",
648 addr, flags, command, size);
649
650 switch (size) {
651 case I2C_SMBUS_BYTE:
652 read_length = 1;
653
654 if (I2C_SMBUS_READ == read_write)
655 count = cp2112_read_req(buf, addr, read_length);
656 else
6d00d153 657 count = cp2112_write_req(buf, addr, command, NULL,
e932d817
DB		 658 0);
659 break;
660 case I2C_SMBUS_BYTE_DATA:
661 read_length = 1;
662
663 if (I2C_SMBUS_READ == read_write)
664 count = cp2112_write_read_req(buf, addr, read_length,
665 command, NULL, 0);
666 else
667 count = cp2112_write_req(buf, addr, command,
668 &data->byte, 1);
669 break;
670 case I2C_SMBUS_WORD_DATA:
671 read_length = 2;
29e2d6d1 672 word = cpu_to_le16(data->word);
e932d817
DB		 673
674 if (I2C_SMBUS_READ == read_write)
675 count = cp2112_write_read_req(buf, addr, read_length,
676 command, NULL, 0);
677 else
678 count = cp2112_write_req(buf, addr, command,
679 (u8 *)&word, 2);
680 break;
681 case I2C_SMBUS_PROC_CALL:
682 size = I2C_SMBUS_WORD_DATA;
683 read_write = I2C_SMBUS_READ;
684 read_length = 2;
29e2d6d1 685 word = cpu_to_le16(data->word);
e932d817
DB		 686
687 count = cp2112_write_read_req(buf, addr, read_length, command,
688 (u8 *)&word, 2);
689 break;
690 case I2C_SMBUS_I2C_BLOCK_DATA:
542134c0
ES		 691 if (read_write == I2C_SMBUS_READ) {
692 read_length = data->block[0];
693 count = cp2112_write_read_req(buf, addr, read_length,
694 command, NULL, 0);
695 } else {
696 count = cp2112_write_req(buf, addr, command,
697 data->block + 1,
698 data->block[0]);
699 }
700 break;
e932d817
DB		 701 case I2C_SMBUS_BLOCK_DATA:
702 if (I2C_SMBUS_READ == read_write) {
703 count = cp2112_write_read_req(buf, addr,
704 I2C_SMBUS_BLOCK_MAX,
705 command, NULL, 0);
706 } else {
707 count = cp2112_write_req(buf, addr, command,
708 data->block,
709 data->block[0] + 1);
710 }
711 break;
712 case I2C_SMBUS_BLOCK_PROC_CALL:
713 size = I2C_SMBUS_BLOCK_DATA;
714 read_write = I2C_SMBUS_READ;
715
716 count = cp2112_write_read_req(buf, addr, I2C_SMBUS_BLOCK_MAX,
717 command, data->block,
718 data->block[0] + 1);
719 break;
720 default:
721 hid_warn(hdev, "Unsupported transaction %d\n", size);
722 return -EOPNOTSUPP;
723 }
724
725 if (count < 0)
726 return count;
727
728 ret = hid_hw_power(hdev, PM_HINT_FULLON);
729 if (ret < 0) {
730 hid_err(hdev, "power management error: %d\n", ret);
731 return ret;
732 }
733
734 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT);
735 if (ret < 0) {
736 hid_warn(hdev, "Error starting transaction: %d\n", ret);
737 goto power_normal;
738 }
739
740 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) {
741 ret = cp2112_xfer_status(dev);
742 if (-EBUSY == ret)
743 continue;
744 if (ret < 0)
745 goto power_normal;
746 break;
747 }
748
749 if (XFER_STATUS_RETRIES <= retries) {
750 hid_warn(hdev, "Transfer timed out, cancelling.\n");
751 buf[0] = CP2112_CANCEL_TRANSFER;
752 buf[1] = 0x01;
753
754 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT);
755 if (ret < 0)
756 hid_warn(hdev, "Error cancelling transaction: %d\n",
757 ret);
758
759 ret = -ETIMEDOUT;
760 goto power_normal;
761 }
762
763 if (I2C_SMBUS_WRITE == read_write) {
764 ret = 0;
765 goto power_normal;
766 }
767
768 if (I2C_SMBUS_BLOCK_DATA == size)
769 read_length = ret;
770
771 ret = cp2112_read(dev, buf, read_length);
772 if (ret < 0)
773 goto power_normal;
774 if (ret != read_length) {
5a673fce 775 hid_warn(hdev, "short read: %d < %zd\n", ret, read_length);
e932d817
DB		 776 ret = -EIO;
777 goto power_normal;
778 }
779
780 switch (size) {
781 case I2C_SMBUS_BYTE:
782 case I2C_SMBUS_BYTE_DATA:
783 data->byte = buf[0];
784 break;
785 case I2C_SMBUS_WORD_DATA:
29e2d6d1 786 data->word = le16_to_cpup((__le16 *)buf);
e932d817 787 break;
542134c0
ES		 788 case I2C_SMBUS_I2C_BLOCK_DATA:
789 memcpy(data->block + 1, buf, read_length);
790 break;
e932d817
DB		 791 case I2C_SMBUS_BLOCK_DATA:
792 if (read_length > I2C_SMBUS_BLOCK_MAX) {
793 ret = -EPROTO;
794 goto power_normal;
795 }
796
797 memcpy(data->block, buf, read_length);
798 break;
799 }
800
801 ret = 0;
802power_normal:
803 hid_hw_power(hdev, PM_HINT_NORMAL);
804 hid_dbg(hdev, "transfer finished: %d\n", ret);
805 return ret;
806}
807
808static u32 cp2112_functionality(struct i2c_adapter *adap)
809{
b9029345
AB		 810 return I2C_FUNC_I2C |
811 I2C_FUNC_SMBUS_BYTE |
e932d817
DB		 812 I2C_FUNC_SMBUS_BYTE_DATA |
813 I2C_FUNC_SMBUS_WORD_DATA |
814 I2C_FUNC_SMBUS_BLOCK_DATA |
815 I2C_FUNC_SMBUS_I2C_BLOCK |
816 I2C_FUNC_SMBUS_PROC_CALL |
817 I2C_FUNC_SMBUS_BLOCK_PROC_CALL;
818}
819
820static const struct i2c_algorithm smbus_algorithm = {
b9029345 821 .master_xfer = cp2112_i2c_xfer,
e932d817
DB		 822 .smbus_xfer = cp2112_xfer,
823 .functionality = cp2112_functionality,
824};
825
826static int cp2112_get_usb_config(struct hid_device *hdev,
827 struct cp2112_usb_config_report *cfg)
828{
829 int ret;
830
831 ret = cp2112_hid_get(hdev, CP2112_USB_CONFIG, (u8 *)cfg, sizeof(*cfg),
832 HID_FEATURE_REPORT);
833 if (ret != sizeof(*cfg)) {
834 hid_err(hdev, "error reading usb config: %d\n", ret);
835 if (ret < 0)
836 return ret;
837 return -EIO;
838 }
839
840 return 0;
841}
842
843static int cp2112_set_usb_config(struct hid_device *hdev,
844 struct cp2112_usb_config_report *cfg)
845{
846 int ret;
847
848 BUG_ON(cfg->report != CP2112_USB_CONFIG);
849
850 ret = cp2112_hid_output(hdev, (u8 *)cfg, sizeof(*cfg),
851 HID_FEATURE_REPORT);
852 if (ret != sizeof(*cfg)) {
853 hid_err(hdev, "error writing usb config: %d\n", ret);
854 if (ret < 0)
855 return ret;
856 return -EIO;
857 }
858
859 return 0;
860}
861
862static void chmod_sysfs_attrs(struct hid_device *hdev);
863
864#define CP2112_CONFIG_ATTR(name, store, format, ...) \
865static ssize_t name##_store(struct device *kdev, \
866 struct device_attribute *attr, const char *buf, \
867 size_t count) \
868{ \
ee79a8f8 869 struct hid_device *hdev = to_hid_device(kdev); \
e932d817
DB		 870 struct cp2112_usb_config_report cfg; \
871 int ret = cp2112_get_usb_config(hdev, &cfg); \
872 if (ret) \
873 return ret; \
874 store; \
875 ret = cp2112_set_usb_config(hdev, &cfg); \
876 if (ret) \
877 return ret; \
878 chmod_sysfs_attrs(hdev); \
879 return count; \
880} \
881static ssize_t name##_show(struct device *kdev, \
882 struct device_attribute *attr, char *buf) \
883{ \
ee79a8f8 884 struct hid_device *hdev = to_hid_device(kdev); \
e932d817
DB		 885 struct cp2112_usb_config_report cfg; \
886 int ret = cp2112_get_usb_config(hdev, &cfg); \
887 if (ret) \
888 return ret; \
889 return scnprintf(buf, PAGE_SIZE, format, ##__VA_ARGS__); \
890} \
c3c041ba 891static DEVICE_ATTR_RW(name);
e932d817
DB		 892
893CP2112_CONFIG_ATTR(vendor_id, ({
894 u16 vid;
895
896 if (sscanf(buf, "%hi", &vid) != 1)
897 return -EINVAL;
898
899 cfg.vid = cpu_to_le16(vid);
900 cfg.mask = 0x01;
901}), "0x%04x\n", le16_to_cpu(cfg.vid));
902
903CP2112_CONFIG_ATTR(product_id, ({
904 u16 pid;
905
906 if (sscanf(buf, "%hi", &pid) != 1)
907 return -EINVAL;
908
909 cfg.pid = cpu_to_le16(pid);
910 cfg.mask = 0x02;
911}), "0x%04x\n", le16_to_cpu(cfg.pid));
912
913CP2112_CONFIG_ATTR(max_power, ({
914 int mA;
915
916 if (sscanf(buf, "%i", &mA) != 1)
917 return -EINVAL;
918
919 cfg.max_power = (mA + 1) / 2;
920 cfg.mask = 0x04;
921}), "%u mA\n", cfg.max_power * 2);
922
923CP2112_CONFIG_ATTR(power_mode, ({
924 if (sscanf(buf, "%hhi", &cfg.power_mode) != 1)
925 return -EINVAL;
926
927 cfg.mask = 0x08;
928}), "%u\n", cfg.power_mode);
929
930CP2112_CONFIG_ATTR(release_version, ({
931 if (sscanf(buf, "%hhi.%hhi", &cfg.release_major, &cfg.release_minor)
932 != 2)
933 return -EINVAL;
934
935 cfg.mask = 0x10;
936}), "%u.%u\n", cfg.release_major, cfg.release_minor);
937
938#undef CP2112_CONFIG_ATTR
939
940struct cp2112_pstring_attribute {
941 struct device_attribute attr;
942 unsigned char report;
943};
944
945static ssize_t pstr_store(struct device *kdev,
946 struct device_attribute *kattr, const char *buf,
947 size_t count)
948{
ee79a8f8 949 struct hid_device *hdev = to_hid_device(kdev);
e932d817
DB		 950 struct cp2112_pstring_attribute *attr =
951 container_of(kattr, struct cp2112_pstring_attribute, attr);
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 = attr->report;
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
977static ssize_t pstr_show(struct device *kdev,
978 struct device_attribute *kattr, char *buf)
979{
ee79a8f8 980 struct hid_device *hdev = to_hid_device(kdev);
e932d817
DB		 981 struct cp2112_pstring_attribute *attr =
982 container_of(kattr, struct cp2112_pstring_attribute, attr);
983 struct cp2112_string_report report;
984 u8 length;
985 int ret;
986
987 ret = cp2112_hid_get(hdev, attr->report, &report.report,
988 sizeof(report) - 1, HID_FEATURE_REPORT);
989 if (ret < 3) {
990 hid_err(hdev, "error reading %s string: %d\n", kattr->attr.name,
991 ret);
992 if (ret < 0)
993 return ret;
994 return -EIO;
995 }
996
997 if (report.length < 2) {
998 hid_err(hdev, "invalid %s string length: %d\n",
999 kattr->attr.name, report.length);
1000 return -EIO;
1001 }
1002
1003 length = report.length > ret - 1 ? ret - 1 : report.length;
1004 length = (length - 2) / sizeof(report.string[0]);
1005 ret = utf16s_to_utf8s(report.string, length, UTF16_LITTLE_ENDIAN, buf,
1006 PAGE_SIZE - 1);
1007 buf[ret++] = '\n';
1008 return ret;
1009}
1010
1011#define CP2112_PSTR_ATTR(name, _report) \
c3c041ba 1012static struct cp2112_pstring_attribute dev_attr_##name = { \
e932d817
DB		 1013 .attr = __ATTR(name, (S_IWUSR | S_IRUGO), pstr_show, pstr_store), \
1014 .report = _report, \
1015};
1016
1017CP2112_PSTR_ATTR(manufacturer, CP2112_MANUFACTURER_STRING);
1018CP2112_PSTR_ATTR(product, CP2112_PRODUCT_STRING);
1019CP2112_PSTR_ATTR(serial, CP2112_SERIAL_STRING);
1020
1021#undef CP2112_PSTR_ATTR
1022
1023static const struct attribute_group cp2112_attr_group = {
1024 .attrs = (struct attribute *[]){
1025 &dev_attr_vendor_id.attr,
1026 &dev_attr_product_id.attr,
1027 &dev_attr_max_power.attr,
1028 &dev_attr_power_mode.attr,
1029 &dev_attr_release_version.attr,
1030 &dev_attr_manufacturer.attr.attr,
1031 &dev_attr_product.attr.attr,
1032 &dev_attr_serial.attr.attr,
1033 NULL
1034 }
1035};
1036
1037/* Chmoding our sysfs attributes is simply a way to expose which fields in the
1038 * PROM have already been programmed. We do not depend on this preventing
1039 * writing to these attributes since the CP2112 will simply ignore writes to
1040 * already-programmed fields. This is why there is no sense in fixing this
1041 * racy behaviour.
1042 */
1043static void chmod_sysfs_attrs(struct hid_device *hdev)
1044{
1045 struct attribute **attr;
1046 u8 buf[2];
1047 int ret;
1048
1049 ret = cp2112_hid_get(hdev, CP2112_LOCK_BYTE, buf, sizeof(buf),
1050 HID_FEATURE_REPORT);
1051 if (ret != sizeof(buf)) {
1052 hid_err(hdev, "error reading lock byte: %d\n", ret);
1053 return;
1054 }
1055
1056 for (attr = cp2112_attr_group.attrs; *attr; ++attr) {
1057 umode_t mode = (buf[1] & 1) ? S_IWUSR | S_IRUGO : S_IRUGO;
1058 ret = sysfs_chmod_file(&hdev->dev.kobj, *attr, mode);
1059 if (ret < 0)
1060 hid_err(hdev, "error chmoding sysfs file %s\n",
1061 (*attr)->name);
1062 buf[1] >>= 1;
1063 }
1064}
1065
13de9cca
BT		 1066static void cp2112_gpio_irq_ack(struct irq_data *d)
1067{
1068}
1069
1070static void cp2112_gpio_irq_mask(struct irq_data *d)
1071{
1072 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1073 struct cp2112_device *dev = gpiochip_get_data(gc);
1074
1075 __clear_bit(d->hwirq, &dev->irq_mask);
1076}
1077
1078static void cp2112_gpio_irq_unmask(struct irq_data *d)
1079{
1080 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1081 struct cp2112_device *dev = gpiochip_get_data(gc);
1082
1083 __set_bit(d->hwirq, &dev->irq_mask);
1084}
1085
1086static void cp2112_gpio_poll_callback(struct work_struct *work)
1087{
1088 struct cp2112_device *dev = container_of(work, struct cp2112_device,
1089 gpio_poll_worker.work);
1090 struct irq_data *d;
1091 u8 gpio_mask;
1092 u8 virqs = (u8)dev->irq_mask;
1093 u32 irq_type;
1094 int irq, virq, ret;
1095
1096 ret = cp2112_gpio_get_all(&dev->gc);
1097 if (ret == -ENODEV) /* the hardware has been disconnected */
1098 return;
1099 if (ret < 0)
1100 goto exit;
1101
1102 gpio_mask = ret;
1103
1104 while (virqs) {
1105 virq = ffs(virqs) - 1;
1106 virqs &= ~BIT(virq);
1107
1108 if (!dev->gc.to_irq)
1109 break;
1110
1111 irq = dev->gc.to_irq(&dev->gc, virq);
1112
1113 d = irq_get_irq_data(irq);
1114 if (!d)
1115 continue;
1116
1117 irq_type = irqd_get_trigger_type(d);
1118
1119 if (gpio_mask & BIT(virq)) {
1120 /* Level High */
1121
1122 if (irq_type & IRQ_TYPE_LEVEL_HIGH)
1123 handle_nested_irq(irq);
1124
1125 if ((irq_type & IRQ_TYPE_EDGE_RISING) &&
1126 !(dev->gpio_prev_state & BIT(virq)))
1127 handle_nested_irq(irq);
1128 } else {
1129 /* Level Low */
1130
1131 if (irq_type & IRQ_TYPE_LEVEL_LOW)
1132 handle_nested_irq(irq);
1133
1134 if ((irq_type & IRQ_TYPE_EDGE_FALLING) &&
1135 (dev->gpio_prev_state & BIT(virq)))
1136 handle_nested_irq(irq);
1137 }
1138 }
1139
1140 dev->gpio_prev_state = gpio_mask;
1141
1142exit:
1143 if (dev->gpio_poll)
1144 schedule_delayed_work(&dev->gpio_poll_worker, 10);
1145}
1146
1147
1148static unsigned int cp2112_gpio_irq_startup(struct irq_data *d)
1149{
1150 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1151 struct cp2112_device *dev = gpiochip_get_data(gc);
1152
1153 INIT_DELAYED_WORK(&dev->gpio_poll_worker, cp2112_gpio_poll_callback);
1154
1155 cp2112_gpio_direction_input(gc, d->hwirq);
1156
1157 if (!dev->gpio_poll) {
1158 dev->gpio_poll = true;
1159 schedule_delayed_work(&dev->gpio_poll_worker, 0);
1160 }
1161
1162 cp2112_gpio_irq_unmask(d);
1163 return 0;
1164}
1165
1166static void cp2112_gpio_irq_shutdown(struct irq_data *d)
1167{
1168 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1169 struct cp2112_device *dev = gpiochip_get_data(gc);
1170
1171 cancel_delayed_work_sync(&dev->gpio_poll_worker);
1172}
1173
1174static int cp2112_gpio_irq_type(struct irq_data *d, unsigned int type)
1175{
1176 return 0;
1177}
1178
1179static 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};
1188
1189static int __maybe_unused cp2112_allocate_irq(struct cp2112_device *dev,
1190 int pin)
1191{
1192 int ret;
1193
1194 if (dev->desc[pin])
1195 return -EINVAL;
1196
1197 dev->desc[pin] = gpiochip_request_own_desc(&dev->gc, pin,
21abf103 1198 "HID/I2C:Event", 0);
13de9cca
BT		 1199 if (IS_ERR(dev->desc[pin])) {
1200 dev_err(dev->gc.parent, "Failed to request GPIO\n");
1201 return PTR_ERR(dev->desc[pin]);
1202 }
1203
1204 ret = gpiochip_lock_as_irq(&dev->gc, pin);
1205 if (ret) {
1206 dev_err(dev->gc.parent, "Failed to lock GPIO as interrupt\n");
1207 goto err_desc;
1208 }
1209
1210 ret = gpiod_to_irq(dev->desc[pin]);
1211 if (ret < 0) {
1212 dev_err(dev->gc.parent, "Failed to translate GPIO to IRQ\n");
1213 goto err_lock;
1214 }
1215
1216 return ret;
1217
1218err_lock:
1219 gpiochip_unlock_as_irq(&dev->gc, pin);
1220err_desc:
1221 gpiochip_free_own_desc(dev->desc[pin]);
1222 dev->desc[pin] = NULL;
1223 return ret;
1224}
1225
e932d817
DB		 1226static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)
1227{
1228 struct cp2112_device *dev;
1229 u8 buf[3];
1230 struct cp2112_smbus_config_report config;
1231 int ret;
1232
1ffb3c40
BT		 1233 dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL);
1234 if (!dev)
1235 return -ENOMEM;
1236
1237 dev->in_out_buffer = devm_kzalloc(&hdev->dev, CP2112_REPORT_MAX_LENGTH,
1238 GFP_KERNEL);
1239 if (!dev->in_out_buffer)
1240 return -ENOMEM;
1241
7a7b5df8 1242 mutex_init(&dev->lock);
1ffb3c40 1243
e932d817
DB		 1244 ret = hid_parse(hdev);
1245 if (ret) {
1246 hid_err(hdev, "parse failed\n");
1247 return ret;
1248 }
1249
1250 ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
1251 if (ret) {
1252 hid_err(hdev, "hw start failed\n");
1253 return ret;
1254 }
1255
1256 ret = hid_hw_open(hdev);
1257 if (ret) {
1258 hid_err(hdev, "hw open failed\n");
1259 goto err_hid_stop;
1260 }
1261
1262 ret = hid_hw_power(hdev, PM_HINT_FULLON);
1263 if (ret < 0) {
1264 hid_err(hdev, "power management error: %d\n", ret);
1265 goto err_hid_close;
1266 }
1267
1268 ret = cp2112_hid_get(hdev, CP2112_GET_VERSION_INFO, buf, sizeof(buf),
1269 HID_FEATURE_REPORT);
1270 if (ret != sizeof(buf)) {
1271 hid_err(hdev, "error requesting version\n");
1272 if (ret >= 0)
1273 ret = -EIO;
1274 goto err_power_normal;
1275 }
1276
1277 hid_info(hdev, "Part Number: 0x%02X Device Version: 0x%02X\n",
1278 buf[1], buf[2]);
1279
1280 ret = cp2112_hid_get(hdev, CP2112_SMBUS_CONFIG, (u8 *)&config,
1281 sizeof(config), HID_FEATURE_REPORT);
1282 if (ret != sizeof(config)) {
1283 hid_err(hdev, "error requesting SMBus config\n");
1284 if (ret >= 0)
1285 ret = -EIO;
1286 goto err_power_normal;
1287 }
1288
1289 config.retry_time = cpu_to_be16(1);
1290
1291 ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config),
1292 HID_FEATURE_REPORT);
1293 if (ret != sizeof(config)) {
1294 hid_err(hdev, "error setting SMBus config\n");
1295 if (ret >= 0)
1296 ret = -EIO;
1297 goto err_power_normal;
1298 }
1299
e932d817
DB		 1300 hid_set_drvdata(hdev, (void *)dev);
1301 dev->hdev = hdev;
1302 dev->adap.owner = THIS_MODULE;
1303 dev->adap.class = I2C_CLASS_HWMON;
1304 dev->adap.algo = &smbus_algorithm;
1305 dev->adap.algo_data = dev;
1306 dev->adap.dev.parent = &hdev->dev;
1307 snprintf(dev->adap.name, sizeof(dev->adap.name),
42cb6b35
JK		 1308 "CP2112 SMBus Bridge on hidraw%d",
1309 ((struct hidraw *)hdev->hidraw)->minor);
44eda784 1310 dev->hwversion = buf[2];
e932d817
DB		 1311 init_waitqueue_head(&dev->wait);
1312
1313 hid_device_io_start(hdev);
1314 ret = i2c_add_adapter(&dev->adap);
1315 hid_device_io_stop(hdev);
1316
1317 if (ret) {
1318 hid_err(hdev, "error registering i2c adapter\n");
1ffb3c40 1319 goto err_power_normal;
e932d817
DB		 1320 }
1321
1322 hid_dbg(hdev, "adapter registered\n");
1323
1324 dev->gc.label = "cp2112_gpio";
1325 dev->gc.direction_input = cp2112_gpio_direction_input;
1326 dev->gc.direction_output = cp2112_gpio_direction_output;
1327 dev->gc.set = cp2112_gpio_set;
1328 dev->gc.get = cp2112_gpio_get;
1329 dev->gc.base = -1;
1330 dev->gc.ngpio = 8;
1331 dev->gc.can_sleep = 1;
58383c78 1332 dev->gc.parent = &hdev->dev;
e932d817 1333
47513c2f 1334 ret = gpiochip_add_data(&dev->gc, dev);
e932d817
DB		 1335 if (ret < 0) {
1336 hid_err(hdev, "error registering gpio chip\n");
1337 goto err_free_i2c;
1338 }
1339
1340 ret = sysfs_create_group(&hdev->dev.kobj, &cp2112_attr_group);
1341 if (ret < 0) {
1342 hid_err(hdev, "error creating sysfs attrs\n");
1343 goto err_gpiochip_remove;
1344 }
1345
1346 chmod_sysfs_attrs(hdev);
1347 hid_hw_power(hdev, PM_HINT_NORMAL);
1348
13de9cca
BT		 1349 ret = gpiochip_irqchip_add(&dev->gc, &cp2112_gpio_irqchip, 0,
1350 handle_simple_irq, IRQ_TYPE_NONE);
1351 if (ret) {
1352 dev_err(dev->gc.parent, "failed to add IRQ chip\n");
1353 goto err_sysfs_remove;
1354 }
1355
e932d817
DB		 1356 return ret;
1357
13de9cca
BT		 1358err_sysfs_remove:
1359 sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group);
e932d817 1360err_gpiochip_remove:
88d5e520 1361 gpiochip_remove(&dev->gc);
e932d817
DB		 1362err_free_i2c:
1363 i2c_del_adapter(&dev->adap);
e932d817
DB		 1364err_power_normal:
1365 hid_hw_power(hdev, PM_HINT_NORMAL);
1366err_hid_close:
1367 hid_hw_close(hdev);
1368err_hid_stop:
1369 hid_hw_stop(hdev);
1370 return ret;
1371}
1372
1373static void cp2112_remove(struct hid_device *hdev)
1374{
1375 struct cp2112_device *dev = hid_get_drvdata(hdev);
13de9cca 1376 int i;
e932d817
DB		 1377
1378 sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group);
e932d817 1379 i2c_del_adapter(&dev->adap);
13de9cca
BT		 1380
1381 if (dev->gpio_poll) {
1382 dev->gpio_poll = false;
1383 cancel_delayed_work_sync(&dev->gpio_poll_worker);
1384 }
1385
1386 for (i = 0; i < ARRAY_SIZE(dev->desc); i++) {
1387 gpiochip_unlock_as_irq(&dev->gc, i);
1388 gpiochip_free_own_desc(dev->desc[i]);
1389 }
1390
1391 gpiochip_remove(&dev->gc);
e932d817
DB		 1392 /* i2c_del_adapter has finished removing all i2c devices from our
1393 * adapter. Well behaved devices should no longer call our cp2112_xfer
1394 * and should have waited for any pending calls to finish. It has also
1395 * waited for device_unregister(&adap->dev) to complete. Therefore we
1396 * can safely free our struct cp2112_device.
1397 */
1398 hid_hw_close(hdev);
1399 hid_hw_stop(hdev);
e932d817
DB		 1400}
1401
1402static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report,
1403 u8 *data, int size)
1404{
1405 struct cp2112_device *dev = hid_get_drvdata(hdev);
1406 struct cp2112_xfer_status_report *xfer = (void *)data;
1407
1408 switch (data[0]) {
1409 case CP2112_TRANSFER_STATUS_RESPONSE:
1410 hid_dbg(hdev, "xfer status: %02x %02x %04x %04x\n",
1411 xfer->status0, xfer->status1,
1412 be16_to_cpu(xfer->retries), be16_to_cpu(xfer->length));
1413
1414 switch (xfer->status0) {
1415 case STATUS0_IDLE:
1416 dev->xfer_status = -EAGAIN;
1417 break;
1418 case STATUS0_BUSY:
1419 dev->xfer_status = -EBUSY;
1420 break;
1421 case STATUS0_COMPLETE:
1422 dev->xfer_status = be16_to_cpu(xfer->length);
1423 break;
1424 case STATUS0_ERROR:
1425 switch (xfer->status1) {
1426 case STATUS1_TIMEOUT_NACK:
1427 case STATUS1_TIMEOUT_BUS:
1428 dev->xfer_status = -ETIMEDOUT;
1429 break;
1430 default:
1431 dev->xfer_status = -EIO;
1432 break;
1433 }
1434 break;
1435 default:
1436 dev->xfer_status = -EINVAL;
1437 break;
1438 }
1439
1440 atomic_set(&dev->xfer_avail, 1);
1441 break;
1442 case CP2112_DATA_READ_RESPONSE:
1443 hid_dbg(hdev, "read response: %02x %02x\n", data[1], data[2]);
1444
1445 dev->read_length = data[2];
1446 if (dev->read_length > sizeof(dev->read_data))
1447 dev->read_length = sizeof(dev->read_data);
1448
1449 memcpy(dev->read_data, &data[3], dev->read_length);
1450 atomic_set(&dev->read_avail, 1);
1451 break;
1452 default:
1453 hid_err(hdev, "unknown report\n");
1454
1455 return 0;
1456 }
1457
1458 wake_up_interruptible(&dev->wait);
1459 return 1;
1460}
1461
1462static struct hid_driver cp2112_driver = {
1463 .name = "cp2112",
1464 .id_table = cp2112_devices,
1465 .probe = cp2112_probe,
1466 .remove = cp2112_remove,
1467 .raw_event = cp2112_raw_event,
1468};
1469
1470module_hid_driver(cp2112_driver);
1471MODULE_DESCRIPTION("Silicon Labs HID USB to SMBus master bridge");
1472MODULE_AUTHOR("David Barksdale <dbarksdale@uplogix.com>");
1473MODULE_LICENSE("GPL");
1474
Linux 6.x block layer and io_uring tree(s)