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Merge tag 'pwm/for-5.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry...
[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:
b1631b84 14 * https://www.silabs.com/Support%20Documents/TechnicalDocs/CP2112.pdf
e932d817 15 * Programming Interface Specification:
ce4dd820 16 * https://www.silabs.com/documents/public/application-notes/an495-cp2112-interface-specification.pdf
e932d817
DB		 17 */
18
5923ea6c
LW		 19#include <linux/gpio/consumer.h>
20#include <linux/gpio/machine.h>
47513c2f 21#include <linux/gpio/driver.h>
e932d817 22#include <linux/hid.h>
42cb6b35 23#include <linux/hidraw.h>
e932d817
DB		 24#include <linux/i2c.h>
25#include <linux/module.h>
26#include <linux/nls.h>
27#include <linux/usb/ch9.h>
28#include "hid-ids.h"
29
1ffb3c40
BT		 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
e932d817
DB		 35enum {
36 CP2112_GPIO_CONFIG = 0x02,
37 CP2112_GPIO_GET = 0x03,
38 CP2112_GPIO_SET = 0x04,
39 CP2112_GET_VERSION_INFO = 0x05,
40 CP2112_SMBUS_CONFIG = 0x06,
41 CP2112_DATA_READ_REQUEST = 0x10,
42 CP2112_DATA_WRITE_READ_REQUEST = 0x11,
43 CP2112_DATA_READ_FORCE_SEND = 0x12,
44 CP2112_DATA_READ_RESPONSE = 0x13,
45 CP2112_DATA_WRITE_REQUEST = 0x14,
46 CP2112_TRANSFER_STATUS_REQUEST = 0x15,
47 CP2112_TRANSFER_STATUS_RESPONSE = 0x16,
48 CP2112_CANCEL_TRANSFER = 0x17,
49 CP2112_LOCK_BYTE = 0x20,
50 CP2112_USB_CONFIG = 0x21,
51 CP2112_MANUFACTURER_STRING = 0x22,
52 CP2112_PRODUCT_STRING = 0x23,
53 CP2112_SERIAL_STRING = 0x24,
54};
55
56enum {
57 STATUS0_IDLE = 0x00,
58 STATUS0_BUSY = 0x01,
59 STATUS0_COMPLETE = 0x02,
60 STATUS0_ERROR = 0x03,
61};
62
63enum {
64 STATUS1_TIMEOUT_NACK = 0x00,
65 STATUS1_TIMEOUT_BUS = 0x01,
66 STATUS1_ARBITRATION_LOST = 0x02,
67 STATUS1_READ_INCOMPLETE = 0x03,
68 STATUS1_WRITE_INCOMPLETE = 0x04,
69 STATUS1_SUCCESS = 0x05,
70};
71
72struct cp2112_smbus_config_report {
73 u8 report; /* CP2112_SMBUS_CONFIG */
74 __be32 clock_speed; /* Hz */
75 u8 device_address; /* Stored in the upper 7 bits */
76 u8 auto_send_read; /* 1 = enabled, 0 = disabled */
77 __be16 write_timeout; /* ms, 0 = no timeout */
78 __be16 read_timeout; /* ms, 0 = no timeout */
79 u8 scl_low_timeout; /* 1 = enabled, 0 = disabled */
80 __be16 retry_time; /* # of retries, 0 = no limit */
81} __packed;
82
83struct cp2112_usb_config_report {
84 u8 report; /* CP2112_USB_CONFIG */
85 __le16 vid; /* Vendor ID */
86 __le16 pid; /* Product ID */
87 u8 max_power; /* Power requested in 2mA units */
88 u8 power_mode; /* 0x00 = bus powered
89 0x01 = self powered & regulator off
90 0x02 = self powered & regulator on */
91 u8 release_major;
92 u8 release_minor;
93 u8 mask; /* What fields to program */
94} __packed;
95
96struct cp2112_read_req_report {
97 u8 report; /* CP2112_DATA_READ_REQUEST */
98 u8 slave_address;
99 __be16 length;
100} __packed;
101
102struct cp2112_write_read_req_report {
103 u8 report; /* CP2112_DATA_WRITE_READ_REQUEST */
104 u8 slave_address;
105 __be16 length;
106 u8 target_address_length;
107 u8 target_address[16];
108} __packed;
109
110struct cp2112_write_req_report {
111 u8 report; /* CP2112_DATA_WRITE_REQUEST */
112 u8 slave_address;
113 u8 length;
114 u8 data[61];
115} __packed;
116
117struct cp2112_force_read_report {
118 u8 report; /* CP2112_DATA_READ_FORCE_SEND */
119 __be16 length;
120} __packed;
121
122struct cp2112_xfer_status_report {
123 u8 report; /* CP2112_TRANSFER_STATUS_RESPONSE */
124 u8 status0; /* STATUS0_* */
125 u8 status1; /* STATUS1_* */
126 __be16 retries;
127 __be16 length;
128} __packed;
129
130struct cp2112_string_report {
131 u8 dummy; /* force .string to be aligned */
132 u8 report; /* CP2112_*_STRING */
133 u8 length; /* length in bytes of everyting after .report */
134 u8 type; /* USB_DT_STRING */
135 wchar_t string[30]; /* UTF16_LITTLE_ENDIAN string */
136} __packed;
137
138/* Number of times to request transfer status before giving up waiting for a
139 transfer to complete. This may need to be changed if SMBUS clock, retries,
140 or read/write/scl_low timeout settings are changed. */
141static const int XFER_STATUS_RETRIES = 10;
142
143/* Time in ms to wait for a CP2112_DATA_READ_RESPONSE or
144 CP2112_TRANSFER_STATUS_RESPONSE. */
145static const int RESPONSE_TIMEOUT = 50;
146
147static const struct hid_device_id cp2112_devices[] = {
148 { HID_USB_DEVICE(USB_VENDOR_ID_CYGNAL, USB_DEVICE_ID_CYGNAL_CP2112) },
149 { }
150};
151MODULE_DEVICE_TABLE(hid, cp2112_devices);
152
153struct cp2112_device {
154 struct i2c_adapter adap;
155 struct hid_device *hdev;
156 wait_queue_head_t wait;
157 u8 read_data[61];
158 u8 read_length;
44eda784 159 u8 hwversion;
e932d817
DB		 160 int xfer_status;
161 atomic_t read_avail;
162 atomic_t xfer_avail;
163 struct gpio_chip gc;
2a2b09c8 164 struct irq_chip irq;
1ffb3c40 165 u8 *in_out_buffer;
7a7b5df8 166 struct mutex lock;
13de9cca
BT		 167
168 struct gpio_desc *desc[8];
169 bool gpio_poll;
170 struct delayed_work gpio_poll_worker;
171 unsigned long irq_mask;
172 u8 gpio_prev_state;
e932d817
DB		 173};
174
175static int gpio_push_pull = 0xFF;
176module_param(gpio_push_pull, int, S_IRUGO | S_IWUSR);
177MODULE_PARM_DESC(gpio_push_pull, "GPIO push-pull configuration bitmask");
178
179static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
180{
47513c2f 181 struct cp2112_device *dev = gpiochip_get_data(chip);
e932d817 182 struct hid_device *hdev = dev->hdev;
1ffb3c40 183 u8 *buf = dev->in_out_buffer;
e932d817
DB		 184 int ret;
185
7a7b5df8 186 mutex_lock(&dev->lock);
1ffb3c40 187
490051ad 188 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
1ffb3c40
BT		 189 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
190 HID_REQ_GET_REPORT);
191 if (ret != CP2112_GPIO_CONFIG_LENGTH) {
e932d817 192 hid_err(hdev, "error requesting GPIO config: %d\n", ret);
7da85fbf
SS		 193 if (ret >= 0)
194 ret = -EIO;
1ffb3c40 195 goto exit;
e932d817
DB		 196 }
197
198 buf[1] &= ~(1 << offset);
199 buf[2] = gpio_push_pull;
200
1ffb3c40
BT		 201 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
202 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
203 HID_REQ_SET_REPORT);
7da85fbf 204 if (ret != CP2112_GPIO_CONFIG_LENGTH) {
e932d817 205 hid_err(hdev, "error setting GPIO config: %d\n", ret);
7da85fbf
SS		 206 if (ret >= 0)
207 ret = -EIO;
1ffb3c40 208 goto exit;
e932d817
DB		 209 }
210
1ffb3c40
BT		 211 ret = 0;
212
213exit:
7a7b5df8 214 mutex_unlock(&dev->lock);
7da85fbf 215 return ret;
e932d817
DB		 216}
217
218static void cp2112_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
219{
47513c2f 220 struct cp2112_device *dev = gpiochip_get_data(chip);
e932d817 221 struct hid_device *hdev = dev->hdev;
1ffb3c40 222 u8 *buf = dev->in_out_buffer;
e932d817
DB		 223 int ret;
224
7a7b5df8 225 mutex_lock(&dev->lock);
1ffb3c40 226
e932d817
DB		 227 buf[0] = CP2112_GPIO_SET;
228 buf[1] = value ? 0xff : 0;
229 buf[2] = 1 << offset;
230
1ffb3c40
BT		 231 ret = hid_hw_raw_request(hdev, CP2112_GPIO_SET, buf,
232 CP2112_GPIO_SET_LENGTH, HID_FEATURE_REPORT,
233 HID_REQ_SET_REPORT);
e932d817
DB		 234 if (ret < 0)
235 hid_err(hdev, "error setting GPIO values: %d\n", ret);
1ffb3c40 236
7a7b5df8 237 mutex_unlock(&dev->lock);
e932d817
DB		 238}
239
13de9cca 240static int cp2112_gpio_get_all(struct gpio_chip *chip)
e932d817 241{
47513c2f 242 struct cp2112_device *dev = gpiochip_get_data(chip);
e932d817 243 struct hid_device *hdev = dev->hdev;
1ffb3c40 244 u8 *buf = dev->in_out_buffer;
e932d817
DB		 245 int ret;
246
7a7b5df8 247 mutex_lock(&dev->lock);
1ffb3c40
BT		 248
249 ret = hid_hw_raw_request(hdev, CP2112_GPIO_GET, buf,
250 CP2112_GPIO_GET_LENGTH, HID_FEATURE_REPORT,
251 HID_REQ_GET_REPORT);
252 if (ret != CP2112_GPIO_GET_LENGTH) {
e932d817 253 hid_err(hdev, "error requesting GPIO values: %d\n", ret);
1ffb3c40
BT		 254 ret = ret < 0 ? ret : -EIO;
255 goto exit;
e932d817
DB		 256 }
257
13de9cca 258 ret = buf[1];
1ffb3c40
BT		 259
260exit:
7a7b5df8 261 mutex_unlock(&dev->lock);
1ffb3c40
BT		 262
263 return ret;
e932d817
DB		 264}
265
13de9cca
BT		 266static int cp2112_gpio_get(struct gpio_chip *chip, unsigned int offset)
267{
268 int ret;
269
270 ret = cp2112_gpio_get_all(chip);
271 if (ret < 0)
272 return ret;
273
274 return (ret >> offset) & 1;
275}
276
e932d817
DB		 277static int cp2112_gpio_direction_output(struct gpio_chip *chip,
278 unsigned offset, int value)
279{
47513c2f 280 struct cp2112_device *dev = gpiochip_get_data(chip);
e932d817 281 struct hid_device *hdev = dev->hdev;
1ffb3c40 282 u8 *buf = dev->in_out_buffer;
e932d817
DB		 283 int ret;
284
7a7b5df8 285 mutex_lock(&dev->lock);
1ffb3c40 286
490051ad 287 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
1ffb3c40
BT		 288 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
289 HID_REQ_GET_REPORT);
290 if (ret != CP2112_GPIO_CONFIG_LENGTH) {
e932d817 291 hid_err(hdev, "error requesting GPIO config: %d\n", ret);
1ffb3c40 292 goto fail;
e932d817
DB		 293 }
294
295 buf[1] |= 1 << offset;
296 buf[2] = gpio_push_pull;
297
1ffb3c40
BT		 298 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
299 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
300 HID_REQ_SET_REPORT);
e932d817
DB		 301 if (ret < 0) {
302 hid_err(hdev, "error setting GPIO config: %d\n", ret);
1ffb3c40 303 goto fail;
e932d817
DB		 304 }
305
7a7b5df8 306 mutex_unlock(&dev->lock);
1ffb3c40 307
beb9d007
AB		 308 /*
309 * Set gpio value when output direction is already set,
310 * as specified in AN495, Rev. 0.2, cpt. 4.4
311 */
312 cp2112_gpio_set(chip, offset, value);
313
e932d817 314 return 0;
1ffb3c40
BT		 315
316fail:
7a7b5df8 317 mutex_unlock(&dev->lock);
1ffb3c40 318 return ret < 0 ? ret : -EIO;
e932d817
DB		 319}
320
321static int cp2112_hid_get(struct hid_device *hdev, unsigned char report_number,
322 u8 *data, size_t count, unsigned char report_type)
323{
324 u8 *buf;
325 int ret;
326
327 buf = kmalloc(count, GFP_KERNEL);
328 if (!buf)
329 return -ENOMEM;
330
490051ad
JK		 331 ret = hid_hw_raw_request(hdev, report_number, buf, count,
332 report_type, HID_REQ_GET_REPORT);
e932d817
DB		 333 memcpy(data, buf, count);
334 kfree(buf);
335 return ret;
336}
337
338static int cp2112_hid_output(struct hid_device *hdev, u8 *data, size_t count,
339 unsigned char report_type)
340{
341 u8 *buf;
342 int ret;
343
344 buf = kmemdup(data, count, GFP_KERNEL);
345 if (!buf)
346 return -ENOMEM;
347
866e4797
BT		 348 if (report_type == HID_OUTPUT_REPORT)
349 ret = hid_hw_output_report(hdev, buf, count);
350 else
351 ret = hid_hw_raw_request(hdev, buf[0], buf, count, report_type,
352 HID_REQ_SET_REPORT);
353
e932d817
DB		 354 kfree(buf);
355 return ret;
356}
357
358static int cp2112_wait(struct cp2112_device *dev, atomic_t *avail)
359{
360 int ret = 0;
361
362 /* We have sent either a CP2112_TRANSFER_STATUS_REQUEST or a
363 * CP2112_DATA_READ_FORCE_SEND and we are waiting for the response to
364 * come in cp2112_raw_event or timeout. There will only be one of these
365 * in flight at any one time. The timeout is extremely large and is a
366 * last resort if the CP2112 has died. If we do timeout we don't expect
367 * to receive the response which would cause data races, it's not like
368 * we can do anything about it anyway.
369 */
370 ret = wait_event_interruptible_timeout(dev->wait,
371 atomic_read(avail), msecs_to_jiffies(RESPONSE_TIMEOUT));
372 if (-ERESTARTSYS == ret)
373 return ret;
374 if (!ret)
375 return -ETIMEDOUT;
376
377 atomic_set(avail, 0);
378 return 0;
379}
380
381static int cp2112_xfer_status(struct cp2112_device *dev)
382{
383 struct hid_device *hdev = dev->hdev;
384 u8 buf[2];
385 int ret;
386
387 buf[0] = CP2112_TRANSFER_STATUS_REQUEST;
388 buf[1] = 0x01;
389 atomic_set(&dev->xfer_avail, 0);
390
391 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT);
392 if (ret < 0) {
393 hid_warn(hdev, "Error requesting status: %d\n", ret);
394 return ret;
395 }
396
397 ret = cp2112_wait(dev, &dev->xfer_avail);
398 if (ret)
399 return ret;
400
401 return dev->xfer_status;
402}
403
404static int cp2112_read(struct cp2112_device *dev, u8 *data, size_t size)
405{
406 struct hid_device *hdev = dev->hdev;
407 struct cp2112_force_read_report report;
408 int ret;
409
6debce6f
AB		 410 if (size > sizeof(dev->read_data))
411 size = sizeof(dev->read_data);
e932d817
DB		 412 report.report = CP2112_DATA_READ_FORCE_SEND;
413 report.length = cpu_to_be16(size);
414
415 atomic_set(&dev->read_avail, 0);
416
417 ret = cp2112_hid_output(hdev, &report.report, sizeof(report),
418 HID_OUTPUT_REPORT);
419 if (ret < 0) {
420 hid_warn(hdev, "Error requesting data: %d\n", ret);
421 return ret;
422 }
423
424 ret = cp2112_wait(dev, &dev->read_avail);
425 if (ret)
426 return ret;
427
5a673fce 428 hid_dbg(hdev, "read %d of %zd bytes requested\n",
e932d817
DB		 429 dev->read_length, size);
430
431 if (size > dev->read_length)
432 size = dev->read_length;
433
434 memcpy(data, dev->read_data, size);
435 return dev->read_length;
436}
437
438static int cp2112_read_req(void *buf, u8 slave_address, u16 length)
439{
440 struct cp2112_read_req_report *report = buf;
441
442 if (length < 1 || length > 512)
443 return -EINVAL;
444
445 report->report = CP2112_DATA_READ_REQUEST;
446 report->slave_address = slave_address << 1;
447 report->length = cpu_to_be16(length);
448 return sizeof(*report);
449}
450
451static int cp2112_write_read_req(void *buf, u8 slave_address, u16 length,
452 u8 command, u8 *data, u8 data_length)
453{
454 struct cp2112_write_read_req_report *report = buf;
455
456 if (length < 1 || length > 512
457 || data_length > sizeof(report->target_address) - 1)
458 return -EINVAL;
459
460 report->report = CP2112_DATA_WRITE_READ_REQUEST;
461 report->slave_address = slave_address << 1;
462 report->length = cpu_to_be16(length);
463 report->target_address_length = data_length + 1;
464 report->target_address[0] = command;
465 memcpy(&report->target_address[1], data, data_length);
466 return data_length + 6;
467}
468
469static int cp2112_write_req(void *buf, u8 slave_address, u8 command, u8 *data,
470 u8 data_length)
471{
472 struct cp2112_write_req_report *report = buf;
473
474 if (data_length > sizeof(report->data) - 1)
475 return -EINVAL;
476
477 report->report = CP2112_DATA_WRITE_REQUEST;
478 report->slave_address = slave_address << 1;
479 report->length = data_length + 1;
480 report->data[0] = command;
481 memcpy(&report->data[1], data, data_length);
482 return data_length + 4;
483}
484
b9029345
AB		 485static int cp2112_i2c_write_req(void *buf, u8 slave_address, u8 *data,
486 u8 data_length)
487{
488 struct cp2112_write_req_report *report = buf;
489
490 if (data_length > sizeof(report->data))
491 return -EINVAL;
492
493 report->report = CP2112_DATA_WRITE_REQUEST;
494 report->slave_address = slave_address << 1;
495 report->length = data_length;
496 memcpy(report->data, data, data_length);
497 return data_length + 3;
498}
499
44eda784
EW		 500static int cp2112_i2c_write_read_req(void *buf, u8 slave_address,
501 u8 *addr, int addr_length,
502 int read_length)
503{
504 struct cp2112_write_read_req_report *report = buf;
505
506 if (read_length < 1 || read_length > 512 ||
507 addr_length > sizeof(report->target_address))
508 return -EINVAL;
509
510 report->report = CP2112_DATA_WRITE_READ_REQUEST;
511 report->slave_address = slave_address << 1;
512 report->length = cpu_to_be16(read_length);
513 report->target_address_length = addr_length;
514 memcpy(report->target_address, addr, addr_length);
515 return addr_length + 5;
516}
517
b9029345
AB		 518static int cp2112_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
519 int num)
520{
521 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data;
522 struct hid_device *hdev = dev->hdev;
523 u8 buf[64];
524 ssize_t count;
44eda784
EW		 525 ssize_t read_length = 0;
526 u8 *read_buf = NULL;
b9029345
AB		 527 unsigned int retries;
528 int ret;
529
530 hid_dbg(hdev, "I2C %d messages\n", num);
531
44eda784
EW		 532 if (num == 1) {
533 if (msgs->flags & I2C_M_RD) {
534 hid_dbg(hdev, "I2C read %#04x len %d\n",
535 msgs->addr, msgs->len);
536 read_length = msgs->len;
537 read_buf = msgs->buf;
538 count = cp2112_read_req(buf, msgs->addr, msgs->len);
539 } else {
540 hid_dbg(hdev, "I2C write %#04x len %d\n",
541 msgs->addr, msgs->len);
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 {
b9029345
AB		 560 hid_err(hdev,
561 "Multi-message I2C transactions not supported\n");
562 return -EOPNOTSUPP;
563 }
564
b9029345
AB		 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
44eda784
EW		 600 for (count = 0; count < read_length;) {
601 ret = cp2112_read(dev, read_buf + count, read_length - count);
5ddfb12e
EW		 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;
44eda784 610 if (count > read_length) {
5ddfb12e
EW		 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",
44eda784 620 ret, read_length - count + ret);
5ddfb12e
EW		 621 ret = -EIO;
622 goto power_normal;
623 }
b9029345
AB		 624 }
625
b9029345 626 /* return the number of transferred messages */
44eda784 627 ret = num;
b9029345
AB		 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
e932d817
DB		 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];
29e2d6d1 642 __le16 word;
0438ee70 643 ssize_t count;
e932d817
DB		 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 read_write == I2C_SMBUS_WRITE ? "write" : "read",
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
6d00d153 659 count = cp2112_write_req(buf, addr, command, NULL,
e932d817
DB		 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;
29e2d6d1 674 word = cpu_to_le16(data->word);
e932d817
DB		 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;
29e2d6d1 687 word = cpu_to_le16(data->word);
e932d817
DB		 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:
542134c0
ES		 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;
e932d817
DB		 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) {
5a673fce 777 hid_warn(hdev, "short read: %d < %zd\n", ret, read_length);
e932d817
DB		 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:
29e2d6d1 788 data->word = le16_to_cpup((__le16 *)buf);
e932d817 789 break;
542134c0
ES		 790 case I2C_SMBUS_I2C_BLOCK_DATA:
791 memcpy(data->block + 1, buf, read_length);
792 break;
e932d817
DB		 793 case I2C_SMBUS_BLOCK_DATA:
794 if (read_length > I2C_SMBUS_BLOCK_MAX) {
795 ret = -EPROTO;
796 goto power_normal;
797 }
798
799 memcpy(data->block, buf, read_length);
800 break;
801 }
802
803 ret = 0;
804power_normal:
805 hid_hw_power(hdev, PM_HINT_NORMAL);
806 hid_dbg(hdev, "transfer finished: %d\n", ret);
807 return ret;
808}
809
810static u32 cp2112_functionality(struct i2c_adapter *adap)
811{
b9029345
AB		 812 return I2C_FUNC_I2C |
813 I2C_FUNC_SMBUS_BYTE |
e932d817
DB		 814 I2C_FUNC_SMBUS_BYTE_DATA |
815 I2C_FUNC_SMBUS_WORD_DATA |
816 I2C_FUNC_SMBUS_BLOCK_DATA |
817 I2C_FUNC_SMBUS_I2C_BLOCK |
818 I2C_FUNC_SMBUS_PROC_CALL |
819 I2C_FUNC_SMBUS_BLOCK_PROC_CALL;
820}
821
822static const struct i2c_algorithm smbus_algorithm = {
b9029345 823 .master_xfer = cp2112_i2c_xfer,
e932d817
DB		 824 .smbus_xfer = cp2112_xfer,
825 .functionality = cp2112_functionality,
826};
827
828static int cp2112_get_usb_config(struct hid_device *hdev,
829 struct cp2112_usb_config_report *cfg)
830{
831 int ret;
832
833 ret = cp2112_hid_get(hdev, CP2112_USB_CONFIG, (u8 *)cfg, sizeof(*cfg),
834 HID_FEATURE_REPORT);
835 if (ret != sizeof(*cfg)) {
836 hid_err(hdev, "error reading usb config: %d\n", ret);
837 if (ret < 0)
838 return ret;
839 return -EIO;
840 }
841
842 return 0;
843}
844
845static int cp2112_set_usb_config(struct hid_device *hdev,
846 struct cp2112_usb_config_report *cfg)
847{
848 int ret;
849
850 BUG_ON(cfg->report != CP2112_USB_CONFIG);
851
852 ret = cp2112_hid_output(hdev, (u8 *)cfg, sizeof(*cfg),
853 HID_FEATURE_REPORT);
854 if (ret != sizeof(*cfg)) {
855 hid_err(hdev, "error writing usb config: %d\n", ret);
856 if (ret < 0)
857 return ret;
858 return -EIO;
859 }
860
861 return 0;
862}
863
864static void chmod_sysfs_attrs(struct hid_device *hdev);
865
866#define CP2112_CONFIG_ATTR(name, store, format, ...) \
867static ssize_t name##_store(struct device *kdev, \
868 struct device_attribute *attr, const char *buf, \
869 size_t count) \
870{ \
ee79a8f8 871 struct hid_device *hdev = to_hid_device(kdev); \
e932d817
DB		 872 struct cp2112_usb_config_report cfg; \
873 int ret = cp2112_get_usb_config(hdev, &cfg); \
874 if (ret) \
875 return ret; \
876 store; \
877 ret = cp2112_set_usb_config(hdev, &cfg); \
878 if (ret) \
879 return ret; \
880 chmod_sysfs_attrs(hdev); \
881 return count; \
882} \
883static ssize_t name##_show(struct device *kdev, \
884 struct device_attribute *attr, char *buf) \
885{ \
ee79a8f8 886 struct hid_device *hdev = to_hid_device(kdev); \
e932d817
DB		 887 struct cp2112_usb_config_report cfg; \
888 int ret = cp2112_get_usb_config(hdev, &cfg); \
889 if (ret) \
890 return ret; \
891 return scnprintf(buf, PAGE_SIZE, format, ##__VA_ARGS__); \
892} \
c3c041ba 893static DEVICE_ATTR_RW(name);
e932d817
DB		 894
895CP2112_CONFIG_ATTR(vendor_id, ({
896 u16 vid;
897
898 if (sscanf(buf, "%hi", &vid) != 1)
899 return -EINVAL;
900
901 cfg.vid = cpu_to_le16(vid);
902 cfg.mask = 0x01;
903}), "0x%04x\n", le16_to_cpu(cfg.vid));
904
905CP2112_CONFIG_ATTR(product_id, ({
906 u16 pid;
907
908 if (sscanf(buf, "%hi", &pid) != 1)
909 return -EINVAL;
910
911 cfg.pid = cpu_to_le16(pid);
912 cfg.mask = 0x02;
913}), "0x%04x\n", le16_to_cpu(cfg.pid));
914
915CP2112_CONFIG_ATTR(max_power, ({
916 int mA;
917
918 if (sscanf(buf, "%i", &mA) != 1)
919 return -EINVAL;
920
921 cfg.max_power = (mA + 1) / 2;
922 cfg.mask = 0x04;
923}), "%u mA\n", cfg.max_power * 2);
924
925CP2112_CONFIG_ATTR(power_mode, ({
926 if (sscanf(buf, "%hhi", &cfg.power_mode) != 1)
927 return -EINVAL;
928
929 cfg.mask = 0x08;
930}), "%u\n", cfg.power_mode);
931
932CP2112_CONFIG_ATTR(release_version, ({
933 if (sscanf(buf, "%hhi.%hhi", &cfg.release_major, &cfg.release_minor)
934 != 2)
935 return -EINVAL;
936
937 cfg.mask = 0x10;
938}), "%u.%u\n", cfg.release_major, cfg.release_minor);
939
940#undef CP2112_CONFIG_ATTR
941
942struct cp2112_pstring_attribute {
943 struct device_attribute attr;
944 unsigned char report;
945};
946
947static ssize_t pstr_store(struct device *kdev,
948 struct device_attribute *kattr, const char *buf,
949 size_t count)
950{
ee79a8f8 951 struct hid_device *hdev = to_hid_device(kdev);
e932d817
DB		 952 struct cp2112_pstring_attribute *attr =
953 container_of(kattr, struct cp2112_pstring_attribute, attr);
954 struct cp2112_string_report report;
955 int ret;
956
957 memset(&report, 0, sizeof(report));
958
959 ret = utf8s_to_utf16s(buf, count, UTF16_LITTLE_ENDIAN,
960 report.string, ARRAY_SIZE(report.string));
961 report.report = attr->report;
962 report.length = ret * sizeof(report.string[0]) + 2;
963 report.type = USB_DT_STRING;
964
965 ret = cp2112_hid_output(hdev, &report.report, report.length + 1,
966 HID_FEATURE_REPORT);
967 if (ret != report.length + 1) {
968 hid_err(hdev, "error writing %s string: %d\n", kattr->attr.name,
969 ret);
970 if (ret < 0)
971 return ret;
972 return -EIO;
973 }
974
975 chmod_sysfs_attrs(hdev);
976 return count;
977}
978
979static ssize_t pstr_show(struct device *kdev,
980 struct device_attribute *kattr, char *buf)
981{
ee79a8f8 982 struct hid_device *hdev = to_hid_device(kdev);
e932d817
DB		 983 struct cp2112_pstring_attribute *attr =
984 container_of(kattr, struct cp2112_pstring_attribute, attr);
985 struct cp2112_string_report report;
986 u8 length;
987 int ret;
988
989 ret = cp2112_hid_get(hdev, attr->report, &report.report,
990 sizeof(report) - 1, HID_FEATURE_REPORT);
991 if (ret < 3) {
992 hid_err(hdev, "error reading %s string: %d\n", kattr->attr.name,
993 ret);
994 if (ret < 0)
995 return ret;
996 return -EIO;
997 }
998
999 if (report.length < 2) {
1000 hid_err(hdev, "invalid %s string length: %d\n",
1001 kattr->attr.name, report.length);
1002 return -EIO;
1003 }
1004
1005 length = report.length > ret - 1 ? ret - 1 : report.length;
1006 length = (length - 2) / sizeof(report.string[0]);
1007 ret = utf16s_to_utf8s(report.string, length, UTF16_LITTLE_ENDIAN, buf,
1008 PAGE_SIZE - 1);
1009 buf[ret++] = '\n';
1010 return ret;
1011}
1012
1013#define CP2112_PSTR_ATTR(name, _report) \
c3c041ba 1014static struct cp2112_pstring_attribute dev_attr_##name = { \
e932d817
DB		 1015 .attr = __ATTR(name, (S_IWUSR | S_IRUGO), pstr_show, pstr_store), \
1016 .report = _report, \
1017};
1018
1019CP2112_PSTR_ATTR(manufacturer, CP2112_MANUFACTURER_STRING);
1020CP2112_PSTR_ATTR(product, CP2112_PRODUCT_STRING);
1021CP2112_PSTR_ATTR(serial, CP2112_SERIAL_STRING);
1022
1023#undef CP2112_PSTR_ATTR
1024
1025static const struct attribute_group cp2112_attr_group = {
1026 .attrs = (struct attribute *[]){
1027 &dev_attr_vendor_id.attr,
1028 &dev_attr_product_id.attr,
1029 &dev_attr_max_power.attr,
1030 &dev_attr_power_mode.attr,
1031 &dev_attr_release_version.attr,
1032 &dev_attr_manufacturer.attr.attr,
1033 &dev_attr_product.attr.attr,
1034 &dev_attr_serial.attr.attr,
1035 NULL
1036 }
1037};
1038
1039/* Chmoding our sysfs attributes is simply a way to expose which fields in the
1040 * PROM have already been programmed. We do not depend on this preventing
1041 * writing to these attributes since the CP2112 will simply ignore writes to
1042 * already-programmed fields. This is why there is no sense in fixing this
1043 * racy behaviour.
1044 */
1045static void chmod_sysfs_attrs(struct hid_device *hdev)
1046{
1047 struct attribute **attr;
1048 u8 buf[2];
1049 int ret;
1050
1051 ret = cp2112_hid_get(hdev, CP2112_LOCK_BYTE, buf, sizeof(buf),
1052 HID_FEATURE_REPORT);
1053 if (ret != sizeof(buf)) {
1054 hid_err(hdev, "error reading lock byte: %d\n", ret);
1055 return;
1056 }
1057
1058 for (attr = cp2112_attr_group.attrs; *attr; ++attr) {
1059 umode_t mode = (buf[1] & 1) ? S_IWUSR | S_IRUGO : S_IRUGO;
1060 ret = sysfs_chmod_file(&hdev->dev.kobj, *attr, mode);
1061 if (ret < 0)
1062 hid_err(hdev, "error chmoding sysfs file %s\n",
1063 (*attr)->name);
1064 buf[1] >>= 1;
1065 }
1066}
1067
13de9cca
BT		 1068static void cp2112_gpio_irq_ack(struct irq_data *d)
1069{
1070}
1071
1072static void cp2112_gpio_irq_mask(struct irq_data *d)
1073{
1074 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1075 struct cp2112_device *dev = gpiochip_get_data(gc);
1076
1077 __clear_bit(d->hwirq, &dev->irq_mask);
1078}
1079
1080static void cp2112_gpio_irq_unmask(struct irq_data *d)
1081{
1082 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1083 struct cp2112_device *dev = gpiochip_get_data(gc);
1084
1085 __set_bit(d->hwirq, &dev->irq_mask);
1086}
1087
1088static void cp2112_gpio_poll_callback(struct work_struct *work)
1089{
1090 struct cp2112_device *dev = container_of(work, struct cp2112_device,
1091 gpio_poll_worker.work);
1092 struct irq_data *d;
1093 u8 gpio_mask;
1094 u8 virqs = (u8)dev->irq_mask;
1095 u32 irq_type;
1096 int irq, virq, ret;
1097
1098 ret = cp2112_gpio_get_all(&dev->gc);
1099 if (ret == -ENODEV) /* the hardware has been disconnected */
1100 return;
1101 if (ret < 0)
1102 goto exit;
1103
1104 gpio_mask = ret;
1105
1106 while (virqs) {
1107 virq = ffs(virqs) - 1;
1108 virqs &= ~BIT(virq);
1109
1110 if (!dev->gc.to_irq)
1111 break;
1112
1113 irq = dev->gc.to_irq(&dev->gc, virq);
1114
1115 d = irq_get_irq_data(irq);
1116 if (!d)
1117 continue;
1118
1119 irq_type = irqd_get_trigger_type(d);
1120
1121 if (gpio_mask & BIT(virq)) {
1122 /* Level High */
1123
1124 if (irq_type & IRQ_TYPE_LEVEL_HIGH)
1125 handle_nested_irq(irq);
1126
1127 if ((irq_type & IRQ_TYPE_EDGE_RISING) &&
1128 !(dev->gpio_prev_state & BIT(virq)))
1129 handle_nested_irq(irq);
1130 } else {
1131 /* Level Low */
1132
1133 if (irq_type & IRQ_TYPE_LEVEL_LOW)
1134 handle_nested_irq(irq);
1135
1136 if ((irq_type & IRQ_TYPE_EDGE_FALLING) &&
1137 (dev->gpio_prev_state & BIT(virq)))
1138 handle_nested_irq(irq);
1139 }
1140 }
1141
1142 dev->gpio_prev_state = gpio_mask;
1143
1144exit:
1145 if (dev->gpio_poll)
1146 schedule_delayed_work(&dev->gpio_poll_worker, 10);
1147}
1148
1149
1150static unsigned int cp2112_gpio_irq_startup(struct irq_data *d)
1151{
1152 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1153 struct cp2112_device *dev = gpiochip_get_data(gc);
1154
1155 INIT_DELAYED_WORK(&dev->gpio_poll_worker, cp2112_gpio_poll_callback);
1156
13de9cca
BT		 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
13de9cca
BT		 1179static int __maybe_unused cp2112_allocate_irq(struct cp2112_device *dev,
1180 int pin)
1181{
1182 int ret;
1183
1184 if (dev->desc[pin])
1185 return -EINVAL;
1186
1187 dev->desc[pin] = gpiochip_request_own_desc(&dev->gc, pin,
5923ea6c
LW		 1188 "HID/I2C:Event",
1189 GPIO_ACTIVE_HIGH,
1190 GPIOD_IN);
13de9cca
BT		 1191 if (IS_ERR(dev->desc[pin])) {
1192 dev_err(dev->gc.parent, "Failed to request GPIO\n");
1193 return PTR_ERR(dev->desc[pin]);
1194 }
1195
2d05dba2
BT		 1196 ret = cp2112_gpio_direction_input(&dev->gc, pin);
1197 if (ret < 0) {
1198 dev_err(dev->gc.parent, "Failed to set GPIO to input dir\n");
1199 goto err_desc;
1200 }
1201
13de9cca
BT		 1202 ret = gpiochip_lock_as_irq(&dev->gc, pin);
1203 if (ret) {
1204 dev_err(dev->gc.parent, "Failed to lock GPIO as interrupt\n");
1205 goto err_desc;
1206 }
1207
1208 ret = gpiod_to_irq(dev->desc[pin]);
1209 if (ret < 0) {
1210 dev_err(dev->gc.parent, "Failed to translate GPIO to IRQ\n");
1211 goto err_lock;
1212 }
1213
1214 return ret;
1215
1216err_lock:
1217 gpiochip_unlock_as_irq(&dev->gc, pin);
1218err_desc:
1219 gpiochip_free_own_desc(dev->desc[pin]);
1220 dev->desc[pin] = NULL;
1221 return ret;
1222}
1223
e932d817
DB		 1224static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)
1225{
1226 struct cp2112_device *dev;
1227 u8 buf[3];
1228 struct cp2112_smbus_config_report config;
6bfa3175 1229 struct gpio_irq_chip *girq;
e932d817
DB		 1230 int ret;
1231
1ffb3c40
BT		 1232 dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL);
1233 if (!dev)
1234 return -ENOMEM;
1235
1236 dev->in_out_buffer = devm_kzalloc(&hdev->dev, CP2112_REPORT_MAX_LENGTH,
1237 GFP_KERNEL);
1238 if (!dev->in_out_buffer)
1239 return -ENOMEM;
1240
7a7b5df8 1241 mutex_init(&dev->lock);
1ffb3c40 1242
e932d817
DB		 1243 ret = hid_parse(hdev);
1244 if (ret) {
1245 hid_err(hdev, "parse failed\n");
1246 return ret;
1247 }
1248
1249 ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
1250 if (ret) {
1251 hid_err(hdev, "hw start failed\n");
1252 return ret;
1253 }
1254
1255 ret = hid_hw_open(hdev);
1256 if (ret) {
1257 hid_err(hdev, "hw open failed\n");
1258 goto err_hid_stop;
1259 }
1260
1261 ret = hid_hw_power(hdev, PM_HINT_FULLON);
1262 if (ret < 0) {
1263 hid_err(hdev, "power management error: %d\n", ret);
1264 goto err_hid_close;
1265 }
1266
1267 ret = cp2112_hid_get(hdev, CP2112_GET_VERSION_INFO, buf, sizeof(buf),
1268 HID_FEATURE_REPORT);
1269 if (ret != sizeof(buf)) {
1270 hid_err(hdev, "error requesting version\n");
1271 if (ret >= 0)
1272 ret = -EIO;
1273 goto err_power_normal;
1274 }
1275
1276 hid_info(hdev, "Part Number: 0x%02X Device Version: 0x%02X\n",
1277 buf[1], buf[2]);
1278
1279 ret = cp2112_hid_get(hdev, CP2112_SMBUS_CONFIG, (u8 *)&config,
1280 sizeof(config), HID_FEATURE_REPORT);
1281 if (ret != sizeof(config)) {
1282 hid_err(hdev, "error requesting SMBus config\n");
1283 if (ret >= 0)
1284 ret = -EIO;
1285 goto err_power_normal;
1286 }
1287
1288 config.retry_time = cpu_to_be16(1);
1289
1290 ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config),
1291 HID_FEATURE_REPORT);
1292 if (ret != sizeof(config)) {
1293 hid_err(hdev, "error setting SMBus config\n");
1294 if (ret >= 0)
1295 ret = -EIO;
1296 goto err_power_normal;
1297 }
1298
e932d817
DB		 1299 hid_set_drvdata(hdev, (void *)dev);
1300 dev->hdev = hdev;
1301 dev->adap.owner = THIS_MODULE;
1302 dev->adap.class = I2C_CLASS_HWMON;
1303 dev->adap.algo = &smbus_algorithm;
1304 dev->adap.algo_data = dev;
1305 dev->adap.dev.parent = &hdev->dev;
1306 snprintf(dev->adap.name, sizeof(dev->adap.name),
42cb6b35
JK		 1307 "CP2112 SMBus Bridge on hidraw%d",
1308 ((struct hidraw *)hdev->hidraw)->minor);
44eda784 1309 dev->hwversion = buf[2];
e932d817
DB		 1310 init_waitqueue_head(&dev->wait);
1311
1312 hid_device_io_start(hdev);
1313 ret = i2c_add_adapter(&dev->adap);
1314 hid_device_io_stop(hdev);
1315
1316 if (ret) {
1317 hid_err(hdev, "error registering i2c adapter\n");
1ffb3c40 1318 goto err_power_normal;
e932d817
DB		 1319 }
1320
1321 hid_dbg(hdev, "adapter registered\n");
1322
1323 dev->gc.label = "cp2112_gpio";
1324 dev->gc.direction_input = cp2112_gpio_direction_input;
1325 dev->gc.direction_output = cp2112_gpio_direction_output;
1326 dev->gc.set = cp2112_gpio_set;
1327 dev->gc.get = cp2112_gpio_get;
1328 dev->gc.base = -1;
1329 dev->gc.ngpio = 8;
1330 dev->gc.can_sleep = 1;
58383c78 1331 dev->gc.parent = &hdev->dev;
e932d817 1332
2a2b09c8
DG		 1333 dev->irq.name = "cp2112-gpio";
1334 dev->irq.irq_startup = cp2112_gpio_irq_startup;
1335 dev->irq.irq_shutdown = cp2112_gpio_irq_shutdown;
1336 dev->irq.irq_ack = cp2112_gpio_irq_ack;
1337 dev->irq.irq_mask = cp2112_gpio_irq_mask;
1338 dev->irq.irq_unmask = cp2112_gpio_irq_unmask;
1339 dev->irq.irq_set_type = cp2112_gpio_irq_type;
1340 dev->irq.flags = IRQCHIP_MASK_ON_SUSPEND;
1341
6bfa3175 1342 girq = &dev->gc.irq;
2a2b09c8 1343 girq->chip = &dev->irq;
6bfa3175
LW		 1344 /* The event comes from the outside so no parent handler */
1345 girq->parent_handler = NULL;
1346 girq->num_parents = 0;
1347 girq->parents = NULL;
1348 girq->default_type = IRQ_TYPE_NONE;
1349 girq->handler = handle_simple_irq;
1350
47513c2f 1351 ret = gpiochip_add_data(&dev->gc, dev);
e932d817
DB		 1352 if (ret < 0) {
1353 hid_err(hdev, "error registering gpio chip\n");
1354 goto err_free_i2c;
1355 }
1356
1357 ret = sysfs_create_group(&hdev->dev.kobj, &cp2112_attr_group);
1358 if (ret < 0) {
1359 hid_err(hdev, "error creating sysfs attrs\n");
1360 goto err_gpiochip_remove;
1361 }
1362
1363 chmod_sysfs_attrs(hdev);
1364 hid_hw_power(hdev, PM_HINT_NORMAL);
1365
1366 return ret;
1367
1368err_gpiochip_remove:
88d5e520 1369 gpiochip_remove(&dev->gc);
e932d817
DB		 1370err_free_i2c:
1371 i2c_del_adapter(&dev->adap);
e932d817
DB		 1372err_power_normal:
1373 hid_hw_power(hdev, PM_HINT_NORMAL);
1374err_hid_close:
1375 hid_hw_close(hdev);
1376err_hid_stop:
1377 hid_hw_stop(hdev);
1378 return ret;
1379}
1380
1381static void cp2112_remove(struct hid_device *hdev)
1382{
1383 struct cp2112_device *dev = hid_get_drvdata(hdev);
13de9cca 1384 int i;
e932d817
DB		 1385
1386 sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group);
e932d817 1387 i2c_del_adapter(&dev->adap);
13de9cca
BT		 1388
1389 if (dev->gpio_poll) {
1390 dev->gpio_poll = false;
1391 cancel_delayed_work_sync(&dev->gpio_poll_worker);
1392 }
1393
1394 for (i = 0; i < ARRAY_SIZE(dev->desc); i++) {
1395 gpiochip_unlock_as_irq(&dev->gc, i);
1396 gpiochip_free_own_desc(dev->desc[i]);
1397 }
1398
1399 gpiochip_remove(&dev->gc);
e932d817
DB		 1400 /* i2c_del_adapter has finished removing all i2c devices from our
1401 * adapter. Well behaved devices should no longer call our cp2112_xfer
1402 * and should have waited for any pending calls to finish. It has also
1403 * waited for device_unregister(&adap->dev) to complete. Therefore we
1404 * can safely free our struct cp2112_device.
1405 */
1406 hid_hw_close(hdev);
1407 hid_hw_stop(hdev);
e932d817
DB		 1408}
1409
1410static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report,
1411 u8 *data, int size)
1412{
1413 struct cp2112_device *dev = hid_get_drvdata(hdev);
1414 struct cp2112_xfer_status_report *xfer = (void *)data;
1415
1416 switch (data[0]) {
1417 case CP2112_TRANSFER_STATUS_RESPONSE:
1418 hid_dbg(hdev, "xfer status: %02x %02x %04x %04x\n",
1419 xfer->status0, xfer->status1,
1420 be16_to_cpu(xfer->retries), be16_to_cpu(xfer->length));
1421
1422 switch (xfer->status0) {
1423 case STATUS0_IDLE:
1424 dev->xfer_status = -EAGAIN;
1425 break;
1426 case STATUS0_BUSY:
1427 dev->xfer_status = -EBUSY;
1428 break;
1429 case STATUS0_COMPLETE:
1430 dev->xfer_status = be16_to_cpu(xfer->length);
1431 break;
1432 case STATUS0_ERROR:
1433 switch (xfer->status1) {
1434 case STATUS1_TIMEOUT_NACK:
1435 case STATUS1_TIMEOUT_BUS:
1436 dev->xfer_status = -ETIMEDOUT;
1437 break;
1438 default:
1439 dev->xfer_status = -EIO;
1440 break;
1441 }
1442 break;
1443 default:
1444 dev->xfer_status = -EINVAL;
1445 break;
1446 }
1447
1448 atomic_set(&dev->xfer_avail, 1);
1449 break;
1450 case CP2112_DATA_READ_RESPONSE:
1451 hid_dbg(hdev, "read response: %02x %02x\n", data[1], data[2]);
1452
1453 dev->read_length = data[2];
1454 if (dev->read_length > sizeof(dev->read_data))
1455 dev->read_length = sizeof(dev->read_data);
1456
1457 memcpy(dev->read_data, &data[3], dev->read_length);
1458 atomic_set(&dev->read_avail, 1);
1459 break;
1460 default:
1461 hid_err(hdev, "unknown report\n");
1462
1463 return 0;
1464 }
1465
1466 wake_up_interruptible(&dev->wait);
1467 return 1;
1468}
1469
1470static struct hid_driver cp2112_driver = {
1471 .name = "cp2112",
1472 .id_table = cp2112_devices,
1473 .probe = cp2112_probe,
1474 .remove = cp2112_remove,
1475 .raw_event = cp2112_raw_event,
1476};
1477
1478module_hid_driver(cp2112_driver);
1479MODULE_DESCRIPTION("Silicon Labs HID USB to SMBus master bridge");
1480MODULE_AUTHOR("David Barksdale <dbarksdale@uplogix.com>");
1481MODULE_LICENSE("GPL");
1482
Linux 6.x block layer and io_uring tree(s)