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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma
[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 */
5e423a0c
KC		 132 struct_group_attr(contents, __packed,
133 u8 report; /* CP2112_*_STRING */
134 u8 length; /* length in bytes of everything after .report */
135 u8 type; /* USB_DT_STRING */
136 wchar_t string[30]; /* UTF16_LITTLE_ENDIAN string */
137 );
e932d817
DB		 138} __packed;
139
140/* Number of times to request transfer status before giving up waiting for a
141 transfer to complete. This may need to be changed if SMBUS clock, retries,
142 or read/write/scl_low timeout settings are changed. */
143static const int XFER_STATUS_RETRIES = 10;
144
145/* Time in ms to wait for a CP2112_DATA_READ_RESPONSE or
146 CP2112_TRANSFER_STATUS_RESPONSE. */
147static const int RESPONSE_TIMEOUT = 50;
148
149static const struct hid_device_id cp2112_devices[] = {
150 { HID_USB_DEVICE(USB_VENDOR_ID_CYGNAL, USB_DEVICE_ID_CYGNAL_CP2112) },
151 { }
152};
153MODULE_DEVICE_TABLE(hid, cp2112_devices);
154
155struct cp2112_device {
156 struct i2c_adapter adap;
157 struct hid_device *hdev;
158 wait_queue_head_t wait;
159 u8 read_data[61];
160 u8 read_length;
44eda784 161 u8 hwversion;
e932d817
DB		 162 int xfer_status;
163 atomic_t read_avail;
164 atomic_t xfer_avail;
165 struct gpio_chip gc;
2a2b09c8 166 struct irq_chip irq;
1ffb3c40 167 u8 *in_out_buffer;
7a7b5df8 168 struct mutex lock;
13de9cca
BT		 169
170 struct gpio_desc *desc[8];
171 bool gpio_poll;
172 struct delayed_work gpio_poll_worker;
173 unsigned long irq_mask;
174 u8 gpio_prev_state;
e932d817
DB		 175};
176
177static int gpio_push_pull = 0xFF;
178module_param(gpio_push_pull, int, S_IRUGO | S_IWUSR);
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{
47513c2f 183 struct cp2112_device *dev = gpiochip_get_data(chip);
e932d817 184 struct hid_device *hdev = dev->hdev;
1ffb3c40 185 u8 *buf = dev->in_out_buffer;
e932d817
DB		 186 int ret;
187
7a7b5df8 188 mutex_lock(&dev->lock);
1ffb3c40 189
490051ad 190 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
1ffb3c40
BT		 191 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
192 HID_REQ_GET_REPORT);
193 if (ret != CP2112_GPIO_CONFIG_LENGTH) {
e932d817 194 hid_err(hdev, "error requesting GPIO config: %d\n", ret);
7da85fbf
SS		 195 if (ret >= 0)
196 ret = -EIO;
1ffb3c40 197 goto exit;
e932d817
DB		 198 }
199
200 buf[1] &= ~(1 << offset);
201 buf[2] = gpio_push_pull;
202
1ffb3c40
BT		 203 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
204 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
205 HID_REQ_SET_REPORT);
7da85fbf 206 if (ret != CP2112_GPIO_CONFIG_LENGTH) {
e932d817 207 hid_err(hdev, "error setting GPIO config: %d\n", ret);
7da85fbf
SS		 208 if (ret >= 0)
209 ret = -EIO;
1ffb3c40 210 goto exit;
e932d817
DB		 211 }
212
1ffb3c40
BT		 213 ret = 0;
214
215exit:
7a7b5df8 216 mutex_unlock(&dev->lock);
7da85fbf 217 return ret;
e932d817
DB		 218}
219
220static void cp2112_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
221{
47513c2f 222 struct cp2112_device *dev = gpiochip_get_data(chip);
e932d817 223 struct hid_device *hdev = dev->hdev;
1ffb3c40 224 u8 *buf = dev->in_out_buffer;
e932d817
DB		 225 int ret;
226
7a7b5df8 227 mutex_lock(&dev->lock);
1ffb3c40 228
e932d817
DB		 229 buf[0] = CP2112_GPIO_SET;
230 buf[1] = value ? 0xff : 0;
231 buf[2] = 1 << offset;
232
1ffb3c40
BT		 233 ret = hid_hw_raw_request(hdev, CP2112_GPIO_SET, buf,
234 CP2112_GPIO_SET_LENGTH, HID_FEATURE_REPORT,
235 HID_REQ_SET_REPORT);
e932d817
DB		 236 if (ret < 0)
237 hid_err(hdev, "error setting GPIO values: %d\n", ret);
1ffb3c40 238
7a7b5df8 239 mutex_unlock(&dev->lock);
e932d817
DB		 240}
241
13de9cca 242static int cp2112_gpio_get_all(struct gpio_chip *chip)
e932d817 243{
47513c2f 244 struct cp2112_device *dev = gpiochip_get_data(chip);
e932d817 245 struct hid_device *hdev = dev->hdev;
1ffb3c40 246 u8 *buf = dev->in_out_buffer;
e932d817
DB		 247 int ret;
248
7a7b5df8 249 mutex_lock(&dev->lock);
1ffb3c40
BT		 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) {
e932d817 255 hid_err(hdev, "error requesting GPIO values: %d\n", ret);
1ffb3c40
BT		 256 ret = ret < 0 ? ret : -EIO;
257 goto exit;
e932d817
DB		 258 }
259
13de9cca 260 ret = buf[1];
1ffb3c40
BT		 261
262exit:
7a7b5df8 263 mutex_unlock(&dev->lock);
1ffb3c40
BT		 264
265 return ret;
e932d817
DB		 266}
267
13de9cca
BT		 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
e932d817
DB		 279static int cp2112_gpio_direction_output(struct gpio_chip *chip,
280 unsigned offset, int value)
281{
47513c2f 282 struct cp2112_device *dev = gpiochip_get_data(chip);
e932d817 283 struct hid_device *hdev = dev->hdev;
1ffb3c40 284 u8 *buf = dev->in_out_buffer;
e932d817
DB		 285 int ret;
286
7a7b5df8 287 mutex_lock(&dev->lock);
1ffb3c40 288
490051ad 289 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
1ffb3c40
BT		 290 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
291 HID_REQ_GET_REPORT);
292 if (ret != CP2112_GPIO_CONFIG_LENGTH) {
e932d817 293 hid_err(hdev, "error requesting GPIO config: %d\n", ret);
1ffb3c40 294 goto fail;
e932d817
DB		 295 }
296
297 buf[1] |= 1 << offset;
298 buf[2] = gpio_push_pull;
299
1ffb3c40
BT		 300 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
301 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
302 HID_REQ_SET_REPORT);
e932d817
DB		 303 if (ret < 0) {
304 hid_err(hdev, "error setting GPIO config: %d\n", ret);
1ffb3c40 305 goto fail;
e932d817
DB		 306 }
307
7a7b5df8 308 mutex_unlock(&dev->lock);
1ffb3c40 309
beb9d007
AB		 310 /*
311 * Set gpio value when output direction is already set,
312 * as specified in AN495, Rev. 0.2, cpt. 4.4
313 */
314 cp2112_gpio_set(chip, offset, value);
315
e932d817 316 return 0;
1ffb3c40
BT		 317
318fail:
7a7b5df8 319 mutex_unlock(&dev->lock);
1ffb3c40 320 return ret < 0 ? ret : -EIO;
e932d817
DB		 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
490051ad
JK		 333 ret = hid_hw_raw_request(hdev, report_number, buf, count,
334 report_type, HID_REQ_GET_REPORT);
e932d817
DB		 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
866e4797
BT		 350 if (report_type == HID_OUTPUT_REPORT)
351 ret = hid_hw_output_report(hdev, buf, count);
352 else
353 ret = hid_hw_raw_request(hdev, buf[0], buf, count, report_type,
354 HID_REQ_SET_REPORT);
355
e932d817
DB		 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 a
365 * CP2112_DATA_READ_FORCE_SEND and we are waiting for the response to
366 * come in cp2112_raw_event or timeout. There will only be one of these
367 * in flight at any one time. The timeout is extremely large and is a
368 * last resort if the CP2112 has died. If we do timeout we don't expect
369 * to receive the response which would cause data races, it's not like
370 * we can do anything about it anyway.
371 */
372 ret = wait_event_interruptible_timeout(dev->wait,
373 atomic_read(avail), msecs_to_jiffies(RESPONSE_TIMEOUT));
374 if (-ERESTARTSYS == ret)
375 return ret;
376 if (!ret)
377 return -ETIMEDOUT;
378
379 atomic_set(avail, 0);
380 return 0;
381}
382
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
6debce6f
AB		 412 if (size > sizeof(dev->read_data))
413 size = sizeof(dev->read_data);
e932d817
DB		 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
5a673fce 430 hid_dbg(hdev, "read %d of %zd bytes requested\n",
e932d817
DB		 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 > 512
459 || data_length > sizeof(report->target_address) - 1)
460 return -EINVAL;
461
462 report->report = CP2112_DATA_WRITE_READ_REQUEST;
463 report->slave_address = slave_address << 1;
464 report->length = cpu_to_be16(length);
465 report->target_address_length = data_length + 1;
466 report->target_address[0] = command;
467 memcpy(&report->target_address[1], data, data_length);
468 return data_length + 6;
469}
470
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
b9029345
AB		 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
44eda784
EW		 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
b9029345
AB		 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;
44eda784
EW		 527 ssize_t read_length = 0;
528 u8 *read_buf = NULL;
b9029345
AB		 529 unsigned int retries;
530 int ret;
531
532 hid_dbg(hdev, "I2C %d messages\n", num);
533
44eda784
EW		 534 if (num == 1) {
535 if (msgs->flags & I2C_M_RD) {
536 hid_dbg(hdev, "I2C read %#04x len %d\n",
537 msgs->addr, msgs->len);
538 read_length = msgs->len;
539 read_buf = msgs->buf;
540 count = cp2112_read_req(buf, msgs->addr, msgs->len);
541 } else {
542 hid_dbg(hdev, "I2C write %#04x len %d\n",
543 msgs->addr, msgs->len);
544 count = cp2112_i2c_write_req(buf, msgs->addr,
545 msgs->buf, msgs->len);
546 }
547 if (count < 0)
548 return count;
549 } else if (dev->hwversion > 1 && /* no repeated start in rev 1 */
550 num == 2 &&
551 msgs[0].addr == msgs[1].addr &&
552 !(msgs[0].flags & I2C_M_RD) && (msgs[1].flags & I2C_M_RD)) {
553 hid_dbg(hdev, "I2C write-read %#04x wlen %d rlen %d\n",
554 msgs[0].addr, msgs[0].len, msgs[1].len);
555 read_length = msgs[1].len;
556 read_buf = msgs[1].buf;
557 count = cp2112_i2c_write_read_req(buf, msgs[0].addr,
558 msgs[0].buf, msgs[0].len, msgs[1].len);
559 if (count < 0)
560 return count;
561 } else {
b9029345
AB		 562 hid_err(hdev,
563 "Multi-message I2C transactions not supported\n");
564 return -EOPNOTSUPP;
565 }
566
b9029345
AB		 567 ret = hid_hw_power(hdev, PM_HINT_FULLON);
568 if (ret < 0) {
569 hid_err(hdev, "power management error: %d\n", ret);
570 return ret;
571 }
572
573 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT);
574 if (ret < 0) {
575 hid_warn(hdev, "Error starting transaction: %d\n", ret);
576 goto power_normal;
577 }
578
579 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) {
580 ret = cp2112_xfer_status(dev);
581 if (-EBUSY == ret)
582 continue;
583 if (ret < 0)
584 goto power_normal;
585 break;
586 }
587
588 if (XFER_STATUS_RETRIES <= retries) {
589 hid_warn(hdev, "Transfer timed out, cancelling.\n");
590 buf[0] = CP2112_CANCEL_TRANSFER;
591 buf[1] = 0x01;
592
593 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT);
594 if (ret < 0)
595 hid_warn(hdev, "Error cancelling transaction: %d\n",
596 ret);
597
598 ret = -ETIMEDOUT;
599 goto power_normal;
600 }
601
44eda784
EW		 602 for (count = 0; count < read_length;) {
603 ret = cp2112_read(dev, read_buf + count, read_length - count);
5ddfb12e
EW		 604 if (ret < 0)
605 goto power_normal;
606 if (ret == 0) {
607 hid_err(hdev, "read returned 0\n");
608 ret = -EIO;
609 goto power_normal;
610 }
611 count += ret;
44eda784 612 if (count > read_length) {
5ddfb12e
EW		 613 /*
614 * The hardware returned too much data.
615 * This is mostly harmless because cp2112_read()
616 * has a limit check so didn't overrun our
617 * buffer. Nevertheless, we return an error
618 * because something is seriously wrong and
619 * it shouldn't go unnoticed.
620 */
621 hid_err(hdev, "long read: %d > %zd\n",
44eda784 622 ret, read_length - count + ret);
5ddfb12e
EW		 623 ret = -EIO;
624 goto power_normal;
625 }
b9029345
AB		 626 }
627
b9029345 628 /* return the number of transferred messages */
44eda784 629 ret = num;
b9029345
AB		 630
631power_normal:
632 hid_hw_power(hdev, PM_HINT_NORMAL);
633 hid_dbg(hdev, "I2C transfer finished: %d\n", ret);
634 return ret;
635}
636
e932d817
DB		 637static int cp2112_xfer(struct i2c_adapter *adap, u16 addr,
638 unsigned short flags, char read_write, u8 command,
639 int size, union i2c_smbus_data *data)
640{
641 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data;
642 struct hid_device *hdev = dev->hdev;
643 u8 buf[64];
29e2d6d1 644 __le16 word;
0438ee70 645 ssize_t count;
e932d817
DB		 646 size_t read_length = 0;
647 unsigned int retries;
648 int ret;
649
650 hid_dbg(hdev, "%s addr 0x%x flags 0x%x cmd 0x%x size %d\n",
651 read_write == I2C_SMBUS_WRITE ? "write" : "read",
652 addr, flags, command, size);
653
654 switch (size) {
655 case I2C_SMBUS_BYTE:
656 read_length = 1;
657
658 if (I2C_SMBUS_READ == read_write)
659 count = cp2112_read_req(buf, addr, read_length);
660 else
6d00d153 661 count = cp2112_write_req(buf, addr, command, NULL,
e932d817
DB		 662 0);
663 break;
664 case I2C_SMBUS_BYTE_DATA:
665 read_length = 1;
666
667 if (I2C_SMBUS_READ == read_write)
668 count = cp2112_write_read_req(buf, addr, read_length,
669 command, NULL, 0);
670 else
671 count = cp2112_write_req(buf, addr, command,
672 &data->byte, 1);
673 break;
674 case I2C_SMBUS_WORD_DATA:
675 read_length = 2;
29e2d6d1 676 word = cpu_to_le16(data->word);
e932d817
DB		 677
678 if (I2C_SMBUS_READ == read_write)
679 count = cp2112_write_read_req(buf, addr, read_length,
680 command, NULL, 0);
681 else
682 count = cp2112_write_req(buf, addr, command,
683 (u8 *)&word, 2);
684 break;
685 case I2C_SMBUS_PROC_CALL:
686 size = I2C_SMBUS_WORD_DATA;
687 read_write = I2C_SMBUS_READ;
688 read_length = 2;
29e2d6d1 689 word = cpu_to_le16(data->word);
e932d817
DB		 690
691 count = cp2112_write_read_req(buf, addr, read_length, command,
692 (u8 *)&word, 2);
693 break;
694 case I2C_SMBUS_I2C_BLOCK_DATA:
542134c0
ES		 695 if (read_write == I2C_SMBUS_READ) {
696 read_length = data->block[0];
697 count = cp2112_write_read_req(buf, addr, read_length,
698 command, NULL, 0);
699 } else {
700 count = cp2112_write_req(buf, addr, command,
701 data->block + 1,
702 data->block[0]);
703 }
704 break;
e932d817
DB		 705 case I2C_SMBUS_BLOCK_DATA:
706 if (I2C_SMBUS_READ == read_write) {
707 count = cp2112_write_read_req(buf, addr,
708 I2C_SMBUS_BLOCK_MAX,
709 command, NULL, 0);
710 } else {
711 count = cp2112_write_req(buf, addr, command,
712 data->block,
713 data->block[0] + 1);
714 }
715 break;
716 case I2C_SMBUS_BLOCK_PROC_CALL:
717 size = I2C_SMBUS_BLOCK_DATA;
718 read_write = I2C_SMBUS_READ;
719
720 count = cp2112_write_read_req(buf, addr, I2C_SMBUS_BLOCK_MAX,
721 command, data->block,
722 data->block[0] + 1);
723 break;
724 default:
725 hid_warn(hdev, "Unsupported transaction %d\n", size);
726 return -EOPNOTSUPP;
727 }
728
729 if (count < 0)
730 return count;
731
732 ret = hid_hw_power(hdev, PM_HINT_FULLON);
733 if (ret < 0) {
734 hid_err(hdev, "power management error: %d\n", ret);
735 return ret;
736 }
737
738 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT);
739 if (ret < 0) {
740 hid_warn(hdev, "Error starting transaction: %d\n", ret);
741 goto power_normal;
742 }
743
744 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) {
745 ret = cp2112_xfer_status(dev);
746 if (-EBUSY == ret)
747 continue;
748 if (ret < 0)
749 goto power_normal;
750 break;
751 }
752
753 if (XFER_STATUS_RETRIES <= retries) {
754 hid_warn(hdev, "Transfer timed out, cancelling.\n");
755 buf[0] = CP2112_CANCEL_TRANSFER;
756 buf[1] = 0x01;
757
758 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT);
759 if (ret < 0)
760 hid_warn(hdev, "Error cancelling transaction: %d\n",
761 ret);
762
763 ret = -ETIMEDOUT;
764 goto power_normal;
765 }
766
767 if (I2C_SMBUS_WRITE == read_write) {
768 ret = 0;
769 goto power_normal;
770 }
771
772 if (I2C_SMBUS_BLOCK_DATA == size)
773 read_length = ret;
774
775 ret = cp2112_read(dev, buf, read_length);
776 if (ret < 0)
777 goto power_normal;
778 if (ret != read_length) {
5a673fce 779 hid_warn(hdev, "short read: %d < %zd\n", ret, read_length);
e932d817
DB		 780 ret = -EIO;
781 goto power_normal;
782 }
783
784 switch (size) {
785 case I2C_SMBUS_BYTE:
786 case I2C_SMBUS_BYTE_DATA:
787 data->byte = buf[0];
788 break;
789 case I2C_SMBUS_WORD_DATA:
29e2d6d1 790 data->word = le16_to_cpup((__le16 *)buf);
e932d817 791 break;
542134c0 792 case I2C_SMBUS_I2C_BLOCK_DATA:
38158384
HM		 793 if (read_length > I2C_SMBUS_BLOCK_MAX) {
794 ret = -EINVAL;
795 goto power_normal;
796 }
797
542134c0
ES		 798 memcpy(data->block + 1, buf, read_length);
799 break;
e932d817
DB		 800 case I2C_SMBUS_BLOCK_DATA:
801 if (read_length > I2C_SMBUS_BLOCK_MAX) {
802 ret = -EPROTO;
803 goto power_normal;
804 }
805
806 memcpy(data->block, buf, read_length);
807 break;
808 }
809
810 ret = 0;
811power_normal:
812 hid_hw_power(hdev, PM_HINT_NORMAL);
813 hid_dbg(hdev, "transfer finished: %d\n", ret);
814 return ret;
815}
816
817static u32 cp2112_functionality(struct i2c_adapter *adap)
818{
b9029345
AB		 819 return I2C_FUNC_I2C |
820 I2C_FUNC_SMBUS_BYTE |
e932d817
DB		 821 I2C_FUNC_SMBUS_BYTE_DATA |
822 I2C_FUNC_SMBUS_WORD_DATA |
823 I2C_FUNC_SMBUS_BLOCK_DATA |
824 I2C_FUNC_SMBUS_I2C_BLOCK |
825 I2C_FUNC_SMBUS_PROC_CALL |
826 I2C_FUNC_SMBUS_BLOCK_PROC_CALL;
827}
828
829static const struct i2c_algorithm smbus_algorithm = {
b9029345 830 .master_xfer = cp2112_i2c_xfer,
e932d817
DB		 831 .smbus_xfer = cp2112_xfer,
832 .functionality = cp2112_functionality,
833};
834
835static int cp2112_get_usb_config(struct hid_device *hdev,
836 struct cp2112_usb_config_report *cfg)
837{
838 int ret;
839
840 ret = cp2112_hid_get(hdev, CP2112_USB_CONFIG, (u8 *)cfg, sizeof(*cfg),
841 HID_FEATURE_REPORT);
842 if (ret != sizeof(*cfg)) {
843 hid_err(hdev, "error reading usb config: %d\n", ret);
844 if (ret < 0)
845 return ret;
846 return -EIO;
847 }
848
849 return 0;
850}
851
852static int cp2112_set_usb_config(struct hid_device *hdev,
853 struct cp2112_usb_config_report *cfg)
854{
855 int ret;
856
857 BUG_ON(cfg->report != CP2112_USB_CONFIG);
858
859 ret = cp2112_hid_output(hdev, (u8 *)cfg, sizeof(*cfg),
860 HID_FEATURE_REPORT);
861 if (ret != sizeof(*cfg)) {
862 hid_err(hdev, "error writing usb config: %d\n", ret);
863 if (ret < 0)
864 return ret;
865 return -EIO;
866 }
867
868 return 0;
869}
870
871static void chmod_sysfs_attrs(struct hid_device *hdev);
872
873#define CP2112_CONFIG_ATTR(name, store, format, ...) \
874static ssize_t name##_store(struct device *kdev, \
875 struct device_attribute *attr, const char *buf, \
876 size_t count) \
877{ \
ee79a8f8 878 struct hid_device *hdev = to_hid_device(kdev); \
e932d817
DB		 879 struct cp2112_usb_config_report cfg; \
880 int ret = cp2112_get_usb_config(hdev, &cfg); \
881 if (ret) \
882 return ret; \
883 store; \
884 ret = cp2112_set_usb_config(hdev, &cfg); \
885 if (ret) \
886 return ret; \
887 chmod_sysfs_attrs(hdev); \
888 return count; \
889} \
890static ssize_t name##_show(struct device *kdev, \
891 struct device_attribute *attr, char *buf) \
892{ \
ee79a8f8 893 struct hid_device *hdev = to_hid_device(kdev); \
e932d817
DB		 894 struct cp2112_usb_config_report cfg; \
895 int ret = cp2112_get_usb_config(hdev, &cfg); \
896 if (ret) \
897 return ret; \
898 return scnprintf(buf, PAGE_SIZE, format, ##__VA_ARGS__); \
899} \
c3c041ba 900static DEVICE_ATTR_RW(name);
e932d817
DB		 901
902CP2112_CONFIG_ATTR(vendor_id, ({
903 u16 vid;
904
905 if (sscanf(buf, "%hi", &vid) != 1)
906 return -EINVAL;
907
908 cfg.vid = cpu_to_le16(vid);
909 cfg.mask = 0x01;
910}), "0x%04x\n", le16_to_cpu(cfg.vid));
911
912CP2112_CONFIG_ATTR(product_id, ({
913 u16 pid;
914
915 if (sscanf(buf, "%hi", &pid) != 1)
916 return -EINVAL;
917
918 cfg.pid = cpu_to_le16(pid);
919 cfg.mask = 0x02;
920}), "0x%04x\n", le16_to_cpu(cfg.pid));
921
922CP2112_CONFIG_ATTR(max_power, ({
923 int mA;
924
925 if (sscanf(buf, "%i", &mA) != 1)
926 return -EINVAL;
927
928 cfg.max_power = (mA + 1) / 2;
929 cfg.mask = 0x04;
930}), "%u mA\n", cfg.max_power * 2);
931
932CP2112_CONFIG_ATTR(power_mode, ({
933 if (sscanf(buf, "%hhi", &cfg.power_mode) != 1)
934 return -EINVAL;
935
936 cfg.mask = 0x08;
937}), "%u\n", cfg.power_mode);
938
939CP2112_CONFIG_ATTR(release_version, ({
940 if (sscanf(buf, "%hhi.%hhi", &cfg.release_major, &cfg.release_minor)
941 != 2)
942 return -EINVAL;
943
944 cfg.mask = 0x10;
945}), "%u.%u\n", cfg.release_major, cfg.release_minor);
946
947#undef CP2112_CONFIG_ATTR
948
949struct cp2112_pstring_attribute {
950 struct device_attribute attr;
951 unsigned char report;
952};
953
954static ssize_t pstr_store(struct device *kdev,
955 struct device_attribute *kattr, const char *buf,
956 size_t count)
957{
ee79a8f8 958 struct hid_device *hdev = to_hid_device(kdev);
e932d817
DB		 959 struct cp2112_pstring_attribute *attr =
960 container_of(kattr, struct cp2112_pstring_attribute, attr);
961 struct cp2112_string_report report;
962 int ret;
963
964 memset(&report, 0, sizeof(report));
965
966 ret = utf8s_to_utf16s(buf, count, UTF16_LITTLE_ENDIAN,
967 report.string, ARRAY_SIZE(report.string));
968 report.report = attr->report;
969 report.length = ret * sizeof(report.string[0]) + 2;
970 report.type = USB_DT_STRING;
971
972 ret = cp2112_hid_output(hdev, &report.report, report.length + 1,
973 HID_FEATURE_REPORT);
974 if (ret != report.length + 1) {
975 hid_err(hdev, "error writing %s string: %d\n", kattr->attr.name,
976 ret);
977 if (ret < 0)
978 return ret;
979 return -EIO;
980 }
981
982 chmod_sysfs_attrs(hdev);
983 return count;
984}
985
986static ssize_t pstr_show(struct device *kdev,
987 struct device_attribute *kattr, char *buf)
988{
ee79a8f8 989 struct hid_device *hdev = to_hid_device(kdev);
e932d817
DB		 990 struct cp2112_pstring_attribute *attr =
991 container_of(kattr, struct cp2112_pstring_attribute, attr);
992 struct cp2112_string_report report;
993 u8 length;
994 int ret;
995
5e423a0c
KC		 996 ret = cp2112_hid_get(hdev, attr->report, (u8 *)&report.contents,
997 sizeof(report.contents), HID_FEATURE_REPORT);
e932d817
DB		 998 if (ret < 3) {
999 hid_err(hdev, "error reading %s string: %d\n", kattr->attr.name,
1000 ret);
1001 if (ret < 0)
1002 return ret;
1003 return -EIO;
1004 }
1005
1006 if (report.length < 2) {
1007 hid_err(hdev, "invalid %s string length: %d\n",
1008 kattr->attr.name, report.length);
1009 return -EIO;
1010 }
1011
1012 length = report.length > ret - 1 ? ret - 1 : report.length;
1013 length = (length - 2) / sizeof(report.string[0]);
1014 ret = utf16s_to_utf8s(report.string, length, UTF16_LITTLE_ENDIAN, buf,
1015 PAGE_SIZE - 1);
1016 buf[ret++] = '\n';
1017 return ret;
1018}
1019
1020#define CP2112_PSTR_ATTR(name, _report) \
c3c041ba 1021static struct cp2112_pstring_attribute dev_attr_##name = { \
e932d817
DB		 1022 .attr = __ATTR(name, (S_IWUSR | S_IRUGO), pstr_show, pstr_store), \
1023 .report = _report, \
1024};
1025
1026CP2112_PSTR_ATTR(manufacturer, CP2112_MANUFACTURER_STRING);
1027CP2112_PSTR_ATTR(product, CP2112_PRODUCT_STRING);
1028CP2112_PSTR_ATTR(serial, CP2112_SERIAL_STRING);
1029
1030#undef CP2112_PSTR_ATTR
1031
1032static const struct attribute_group cp2112_attr_group = {
1033 .attrs = (struct attribute *[]){
1034 &dev_attr_vendor_id.attr,
1035 &dev_attr_product_id.attr,
1036 &dev_attr_max_power.attr,
1037 &dev_attr_power_mode.attr,
1038 &dev_attr_release_version.attr,
1039 &dev_attr_manufacturer.attr.attr,
1040 &dev_attr_product.attr.attr,
1041 &dev_attr_serial.attr.attr,
1042 NULL
1043 }
1044};
1045
1046/* Chmoding our sysfs attributes is simply a way to expose which fields in the
1047 * PROM have already been programmed. We do not depend on this preventing
1048 * writing to these attributes since the CP2112 will simply ignore writes to
1049 * already-programmed fields. This is why there is no sense in fixing this
1050 * racy behaviour.
1051 */
1052static void chmod_sysfs_attrs(struct hid_device *hdev)
1053{
1054 struct attribute **attr;
1055 u8 buf[2];
1056 int ret;
1057
1058 ret = cp2112_hid_get(hdev, CP2112_LOCK_BYTE, buf, sizeof(buf),
1059 HID_FEATURE_REPORT);
1060 if (ret != sizeof(buf)) {
1061 hid_err(hdev, "error reading lock byte: %d\n", ret);
1062 return;
1063 }
1064
1065 for (attr = cp2112_attr_group.attrs; *attr; ++attr) {
1066 umode_t mode = (buf[1] & 1) ? S_IWUSR | S_IRUGO : S_IRUGO;
1067 ret = sysfs_chmod_file(&hdev->dev.kobj, *attr, mode);
1068 if (ret < 0)
1069 hid_err(hdev, "error chmoding sysfs file %s\n",
1070 (*attr)->name);
1071 buf[1] >>= 1;
1072 }
1073}
1074
13de9cca
BT		 1075static void cp2112_gpio_irq_ack(struct irq_data *d)
1076{
1077}
1078
1079static void cp2112_gpio_irq_mask(struct irq_data *d)
1080{
1081 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1082 struct cp2112_device *dev = gpiochip_get_data(gc);
1083
1084 __clear_bit(d->hwirq, &dev->irq_mask);
1085}
1086
1087static void cp2112_gpio_irq_unmask(struct irq_data *d)
1088{
1089 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1090 struct cp2112_device *dev = gpiochip_get_data(gc);
1091
1092 __set_bit(d->hwirq, &dev->irq_mask);
1093}
1094
1095static void cp2112_gpio_poll_callback(struct work_struct *work)
1096{
1097 struct cp2112_device *dev = container_of(work, struct cp2112_device,
1098 gpio_poll_worker.work);
1099 struct irq_data *d;
1100 u8 gpio_mask;
1101 u8 virqs = (u8)dev->irq_mask;
1102 u32 irq_type;
1103 int irq, virq, ret;
1104
1105 ret = cp2112_gpio_get_all(&dev->gc);
1106 if (ret == -ENODEV) /* the hardware has been disconnected */
1107 return;
1108 if (ret < 0)
1109 goto exit;
1110
1111 gpio_mask = ret;
1112
1113 while (virqs) {
1114 virq = ffs(virqs) - 1;
1115 virqs &= ~BIT(virq);
1116
1117 if (!dev->gc.to_irq)
1118 break;
1119
1120 irq = dev->gc.to_irq(&dev->gc, virq);
1121
1122 d = irq_get_irq_data(irq);
1123 if (!d)
1124 continue;
1125
1126 irq_type = irqd_get_trigger_type(d);
1127
1128 if (gpio_mask & BIT(virq)) {
1129 /* Level High */
1130
1131 if (irq_type & IRQ_TYPE_LEVEL_HIGH)
1132 handle_nested_irq(irq);
1133
1134 if ((irq_type & IRQ_TYPE_EDGE_RISING) &&
1135 !(dev->gpio_prev_state & BIT(virq)))
1136 handle_nested_irq(irq);
1137 } else {
1138 /* Level Low */
1139
1140 if (irq_type & IRQ_TYPE_LEVEL_LOW)
1141 handle_nested_irq(irq);
1142
1143 if ((irq_type & IRQ_TYPE_EDGE_FALLING) &&
1144 (dev->gpio_prev_state & BIT(virq)))
1145 handle_nested_irq(irq);
1146 }
1147 }
1148
1149 dev->gpio_prev_state = gpio_mask;
1150
1151exit:
1152 if (dev->gpio_poll)
1153 schedule_delayed_work(&dev->gpio_poll_worker, 10);
1154}
1155
1156
1157static unsigned int cp2112_gpio_irq_startup(struct irq_data *d)
1158{
1159 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1160 struct cp2112_device *dev = gpiochip_get_data(gc);
1161
1162 INIT_DELAYED_WORK(&dev->gpio_poll_worker, cp2112_gpio_poll_callback);
1163
13de9cca
BT		 1164 if (!dev->gpio_poll) {
1165 dev->gpio_poll = true;
1166 schedule_delayed_work(&dev->gpio_poll_worker, 0);
1167 }
1168
1169 cp2112_gpio_irq_unmask(d);
1170 return 0;
1171}
1172
1173static void cp2112_gpio_irq_shutdown(struct irq_data *d)
1174{
1175 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1176 struct cp2112_device *dev = gpiochip_get_data(gc);
1177
1178 cancel_delayed_work_sync(&dev->gpio_poll_worker);
1179}
1180
1181static int cp2112_gpio_irq_type(struct irq_data *d, unsigned int type)
1182{
1183 return 0;
1184}
1185
13de9cca
BT		 1186static int __maybe_unused cp2112_allocate_irq(struct cp2112_device *dev,
1187 int pin)
1188{
1189 int ret;
1190
1191 if (dev->desc[pin])
1192 return -EINVAL;
1193
1194 dev->desc[pin] = gpiochip_request_own_desc(&dev->gc, pin,
5923ea6c
LW		 1195 "HID/I2C:Event",
1196 GPIO_ACTIVE_HIGH,
1197 GPIOD_IN);
13de9cca
BT		 1198 if (IS_ERR(dev->desc[pin])) {
1199 dev_err(dev->gc.parent, "Failed to request GPIO\n");
1200 return PTR_ERR(dev->desc[pin]);
1201 }
1202
2d05dba2
BT		 1203 ret = cp2112_gpio_direction_input(&dev->gc, pin);
1204 if (ret < 0) {
1205 dev_err(dev->gc.parent, "Failed to set GPIO to input dir\n");
1206 goto err_desc;
1207 }
1208
13de9cca
BT		 1209 ret = gpiochip_lock_as_irq(&dev->gc, pin);
1210 if (ret) {
1211 dev_err(dev->gc.parent, "Failed to lock GPIO as interrupt\n");
1212 goto err_desc;
1213 }
1214
1215 ret = gpiod_to_irq(dev->desc[pin]);
1216 if (ret < 0) {
1217 dev_err(dev->gc.parent, "Failed to translate GPIO to IRQ\n");
1218 goto err_lock;
1219 }
1220
1221 return ret;
1222
1223err_lock:
1224 gpiochip_unlock_as_irq(&dev->gc, pin);
1225err_desc:
1226 gpiochip_free_own_desc(dev->desc[pin]);
1227 dev->desc[pin] = NULL;
1228 return ret;
1229}
1230
e932d817
DB		 1231static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)
1232{
1233 struct cp2112_device *dev;
1234 u8 buf[3];
1235 struct cp2112_smbus_config_report config;
6bfa3175 1236 struct gpio_irq_chip *girq;
e932d817
DB		 1237 int ret;
1238
1ffb3c40
BT		 1239 dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL);
1240 if (!dev)
1241 return -ENOMEM;
1242
1243 dev->in_out_buffer = devm_kzalloc(&hdev->dev, CP2112_REPORT_MAX_LENGTH,
1244 GFP_KERNEL);
1245 if (!dev->in_out_buffer)
1246 return -ENOMEM;
1247
7a7b5df8 1248 mutex_init(&dev->lock);
1ffb3c40 1249
e932d817
DB		 1250 ret = hid_parse(hdev);
1251 if (ret) {
1252 hid_err(hdev, "parse failed\n");
1253 return ret;
1254 }
1255
1256 ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
1257 if (ret) {
1258 hid_err(hdev, "hw start failed\n");
1259 return ret;
1260 }
1261
1262 ret = hid_hw_open(hdev);
1263 if (ret) {
1264 hid_err(hdev, "hw open failed\n");
1265 goto err_hid_stop;
1266 }
1267
1268 ret = hid_hw_power(hdev, PM_HINT_FULLON);
1269 if (ret < 0) {
1270 hid_err(hdev, "power management error: %d\n", ret);
1271 goto err_hid_close;
1272 }
1273
1274 ret = cp2112_hid_get(hdev, CP2112_GET_VERSION_INFO, buf, sizeof(buf),
1275 HID_FEATURE_REPORT);
1276 if (ret != sizeof(buf)) {
1277 hid_err(hdev, "error requesting version\n");
1278 if (ret >= 0)
1279 ret = -EIO;
1280 goto err_power_normal;
1281 }
1282
1283 hid_info(hdev, "Part Number: 0x%02X Device Version: 0x%02X\n",
1284 buf[1], buf[2]);
1285
1286 ret = cp2112_hid_get(hdev, CP2112_SMBUS_CONFIG, (u8 *)&config,
1287 sizeof(config), HID_FEATURE_REPORT);
1288 if (ret != sizeof(config)) {
1289 hid_err(hdev, "error requesting SMBus config\n");
1290 if (ret >= 0)
1291 ret = -EIO;
1292 goto err_power_normal;
1293 }
1294
1295 config.retry_time = cpu_to_be16(1);
1296
1297 ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config),
1298 HID_FEATURE_REPORT);
1299 if (ret != sizeof(config)) {
1300 hid_err(hdev, "error setting SMBus config\n");
1301 if (ret >= 0)
1302 ret = -EIO;
1303 goto err_power_normal;
1304 }
1305
e932d817
DB		 1306 hid_set_drvdata(hdev, (void *)dev);
1307 dev->hdev = hdev;
1308 dev->adap.owner = THIS_MODULE;
1309 dev->adap.class = I2C_CLASS_HWMON;
1310 dev->adap.algo = &smbus_algorithm;
1311 dev->adap.algo_data = dev;
1312 dev->adap.dev.parent = &hdev->dev;
1313 snprintf(dev->adap.name, sizeof(dev->adap.name),
42cb6b35
JK		 1314 "CP2112 SMBus Bridge on hidraw%d",
1315 ((struct hidraw *)hdev->hidraw)->minor);
44eda784 1316 dev->hwversion = buf[2];
e932d817
DB		 1317 init_waitqueue_head(&dev->wait);
1318
1319 hid_device_io_start(hdev);
1320 ret = i2c_add_adapter(&dev->adap);
1321 hid_device_io_stop(hdev);
1322
1323 if (ret) {
1324 hid_err(hdev, "error registering i2c adapter\n");
1ffb3c40 1325 goto err_power_normal;
e932d817
DB		 1326 }
1327
1328 hid_dbg(hdev, "adapter registered\n");
1329
1330 dev->gc.label = "cp2112_gpio";
1331 dev->gc.direction_input = cp2112_gpio_direction_input;
1332 dev->gc.direction_output = cp2112_gpio_direction_output;
1333 dev->gc.set = cp2112_gpio_set;
1334 dev->gc.get = cp2112_gpio_get;
1335 dev->gc.base = -1;
1336 dev->gc.ngpio = 8;
1337 dev->gc.can_sleep = 1;
58383c78 1338 dev->gc.parent = &hdev->dev;
e932d817 1339
2a2b09c8
DG		 1340 dev->irq.name = "cp2112-gpio";
1341 dev->irq.irq_startup = cp2112_gpio_irq_startup;
1342 dev->irq.irq_shutdown = cp2112_gpio_irq_shutdown;
1343 dev->irq.irq_ack = cp2112_gpio_irq_ack;
1344 dev->irq.irq_mask = cp2112_gpio_irq_mask;
1345 dev->irq.irq_unmask = cp2112_gpio_irq_unmask;
1346 dev->irq.irq_set_type = cp2112_gpio_irq_type;
1347 dev->irq.flags = IRQCHIP_MASK_ON_SUSPEND;
1348
6bfa3175 1349 girq = &dev->gc.irq;
2a2b09c8 1350 girq->chip = &dev->irq;
6bfa3175
LW		 1351 /* The event comes from the outside so no parent handler */
1352 girq->parent_handler = NULL;
1353 girq->num_parents = 0;
1354 girq->parents = NULL;
1355 girq->default_type = IRQ_TYPE_NONE;
1356 girq->handler = handle_simple_irq;
37f5b858 1357 girq->threaded = true;
6bfa3175 1358
47513c2f 1359 ret = gpiochip_add_data(&dev->gc, dev);
e932d817
DB		 1360 if (ret < 0) {
1361 hid_err(hdev, "error registering gpio chip\n");
1362 goto err_free_i2c;
1363 }
1364
1365 ret = sysfs_create_group(&hdev->dev.kobj, &cp2112_attr_group);
1366 if (ret < 0) {
1367 hid_err(hdev, "error creating sysfs attrs\n");
1368 goto err_gpiochip_remove;
1369 }
1370
1371 chmod_sysfs_attrs(hdev);
1372 hid_hw_power(hdev, PM_HINT_NORMAL);
1373
1374 return ret;
1375
1376err_gpiochip_remove:
88d5e520 1377 gpiochip_remove(&dev->gc);
e932d817
DB		 1378err_free_i2c:
1379 i2c_del_adapter(&dev->adap);
e932d817
DB		 1380err_power_normal:
1381 hid_hw_power(hdev, PM_HINT_NORMAL);
1382err_hid_close:
1383 hid_hw_close(hdev);
1384err_hid_stop:
1385 hid_hw_stop(hdev);
1386 return ret;
1387}
1388
1389static void cp2112_remove(struct hid_device *hdev)
1390{
1391 struct cp2112_device *dev = hid_get_drvdata(hdev);
13de9cca 1392 int i;
e932d817
DB		 1393
1394 sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group);
e932d817 1395 i2c_del_adapter(&dev->adap);
13de9cca
BT		 1396
1397 if (dev->gpio_poll) {
1398 dev->gpio_poll = false;
1399 cancel_delayed_work_sync(&dev->gpio_poll_worker);
1400 }
1401
1402 for (i = 0; i < ARRAY_SIZE(dev->desc); i++) {
1403 gpiochip_unlock_as_irq(&dev->gc, i);
1404 gpiochip_free_own_desc(dev->desc[i]);
1405 }
1406
1407 gpiochip_remove(&dev->gc);
e932d817
DB		 1408 /* i2c_del_adapter has finished removing all i2c devices from our
1409 * adapter. Well behaved devices should no longer call our cp2112_xfer
1410 * and should have waited for any pending calls to finish. It has also
1411 * waited for device_unregister(&adap->dev) to complete. Therefore we
1412 * can safely free our struct cp2112_device.
1413 */
1414 hid_hw_close(hdev);
1415 hid_hw_stop(hdev);
e932d817
DB		 1416}
1417
1418static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report,
1419 u8 *data, int size)
1420{
1421 struct cp2112_device *dev = hid_get_drvdata(hdev);
1422 struct cp2112_xfer_status_report *xfer = (void *)data;
1423
1424 switch (data[0]) {
1425 case CP2112_TRANSFER_STATUS_RESPONSE:
1426 hid_dbg(hdev, "xfer status: %02x %02x %04x %04x\n",
1427 xfer->status0, xfer->status1,
1428 be16_to_cpu(xfer->retries), be16_to_cpu(xfer->length));
1429
1430 switch (xfer->status0) {
1431 case STATUS0_IDLE:
1432 dev->xfer_status = -EAGAIN;
1433 break;
1434 case STATUS0_BUSY:
1435 dev->xfer_status = -EBUSY;
1436 break;
1437 case STATUS0_COMPLETE:
1438 dev->xfer_status = be16_to_cpu(xfer->length);
1439 break;
1440 case STATUS0_ERROR:
1441 switch (xfer->status1) {
1442 case STATUS1_TIMEOUT_NACK:
1443 case STATUS1_TIMEOUT_BUS:
1444 dev->xfer_status = -ETIMEDOUT;
1445 break;
1446 default:
1447 dev->xfer_status = -EIO;
1448 break;
1449 }
1450 break;
1451 default:
1452 dev->xfer_status = -EINVAL;
1453 break;
1454 }
1455
1456 atomic_set(&dev->xfer_avail, 1);
1457 break;
1458 case CP2112_DATA_READ_RESPONSE:
1459 hid_dbg(hdev, "read response: %02x %02x\n", data[1], data[2]);
1460
1461 dev->read_length = data[2];
1462 if (dev->read_length > sizeof(dev->read_data))
1463 dev->read_length = sizeof(dev->read_data);
1464
1465 memcpy(dev->read_data, &data[3], dev->read_length);
1466 atomic_set(&dev->read_avail, 1);
1467 break;
1468 default:
1469 hid_err(hdev, "unknown report\n");
1470
1471 return 0;
1472 }
1473
1474 wake_up_interruptible(&dev->wait);
1475 return 1;
1476}
1477
1478static struct hid_driver cp2112_driver = {
1479 .name = "cp2112",
1480 .id_table = cp2112_devices,
1481 .probe = cp2112_probe,
1482 .remove = cp2112_remove,
1483 .raw_event = cp2112_raw_event,
1484};
1485
1486module_hid_driver(cp2112_driver);
1487MODULE_DESCRIPTION("Silicon Labs HID USB to SMBus master bridge");
1488MODULE_AUTHOR("David Barksdale <dbarksdale@uplogix.com>");
1489MODULE_LICENSE("GPL");
1490
Linux 6.x block layer and io_uring tree(s)