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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / hid / hid-cp2112.c
blobdb1b55df0d1319c21b382fd8430e95f1821e3415
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * hid-cp2112.c - Silicon Labs HID USB to SMBus master bridge
4 * Copyright (c) 2013,2014 Uplogix, Inc.
5 * David Barksdale <dbarksdale@uplogix.com>
6 */
7
8 /*
9 * The Silicon Labs CP2112 chip is a USB HID device which provides an
10 * SMBus controller for talking to slave devices and 8 GPIO pins. The
11 * host communicates with the CP2112 via raw HID reports.
12 *
13 * Data Sheet:
14 * http://www.silabs.com/Support%20Documents/TechnicalDocs/CP2112.pdf
15 * Programming Interface Specification:
16 * https://www.silabs.com/documents/public/application-notes/an495-cp2112-interface-specification.pdf
17 */
18
19 #include <linux/gpio/consumer.h>
20 #include <linux/gpio/machine.h>
21 #include <linux/gpio/driver.h>
22 #include <linux/hid.h>
23 #include <linux/hidraw.h>
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
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
35 enum {
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
56 enum {
57 STATUS0_IDLE = 0x00,
58 STATUS0_BUSY = 0x01,
59 STATUS0_COMPLETE = 0x02,
60 STATUS0_ERROR = 0x03,
61 };
62
63 enum {
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
72 struct 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
83 struct 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
96 struct cp2112_read_req_report {
97 u8 report; /* CP2112_DATA_READ_REQUEST */
98 u8 slave_address;
99 __be16 length;
100 } __packed;
101
102 struct 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
110 struct 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
117 struct cp2112_force_read_report {
118 u8 report; /* CP2112_DATA_READ_FORCE_SEND */
119 __be16 length;
120 } __packed;
121
122 struct 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
130 struct 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. */
141 static 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. */
145 static const int RESPONSE_TIMEOUT = 50;
146
147 static const struct hid_device_id cp2112_devices[] = {
148 { HID_USB_DEVICE(USB_VENDOR_ID_CYGNAL, USB_DEVICE_ID_CYGNAL_CP2112) },
149 { }
150 };
151 MODULE_DEVICE_TABLE(hid, cp2112_devices);
152
153 struct 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;
159 u8 hwversion;
160 int xfer_status;
161 atomic_t read_avail;
162 atomic_t xfer_avail;
163 struct gpio_chip gc;
164 u8 *in_out_buffer;
165 struct mutex lock;
166
167 struct gpio_desc *desc[8];
168 bool gpio_poll;
169 struct delayed_work gpio_poll_worker;
170 unsigned long irq_mask;
171 u8 gpio_prev_state;
172 };
173
174 static int gpio_push_pull = 0xFF;
175 module_param(gpio_push_pull, int, S_IRUGO | S_IWUSR);
176 MODULE_PARM_DESC(gpio_push_pull, "GPIO push-pull configuration bitmask");
177
178 static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
179 {
180 struct cp2112_device *dev = gpiochip_get_data(chip);
181 struct hid_device *hdev = dev->hdev;
182 u8 *buf = dev->in_out_buffer;
183 int ret;
184
185 mutex_lock(&dev->lock);
186
187 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
188 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
189 HID_REQ_GET_REPORT);
190 if (ret != CP2112_GPIO_CONFIG_LENGTH) {
191 hid_err(hdev, "error requesting GPIO config: %d\n", ret);
192 if (ret >= 0)
193 ret = -EIO;
194 goto exit;
195 }
196
197 buf[1] &= ~(1 << offset);
198 buf[2] = gpio_push_pull;
199
200 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
201 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
202 HID_REQ_SET_REPORT);
203 if (ret != CP2112_GPIO_CONFIG_LENGTH) {
204 hid_err(hdev, "error setting GPIO config: %d\n", ret);
205 if (ret >= 0)
206 ret = -EIO;
207 goto exit;
208 }
209
210 ret = 0;
211
212 exit:
213 mutex_unlock(&dev->lock);
214 return ret;
215 }
216
217 static void cp2112_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
218 {
219 struct cp2112_device *dev = gpiochip_get_data(chip);
220 struct hid_device *hdev = dev->hdev;
221 u8 *buf = dev->in_out_buffer;
222 int ret;
223
224 mutex_lock(&dev->lock);
225
226 buf[0] = CP2112_GPIO_SET;
227 buf[1] = value ? 0xff : 0;
228 buf[2] = 1 << offset;
229
230 ret = hid_hw_raw_request(hdev, CP2112_GPIO_SET, buf,
231 CP2112_GPIO_SET_LENGTH, HID_FEATURE_REPORT,
232 HID_REQ_SET_REPORT);
233 if (ret < 0)
234 hid_err(hdev, "error setting GPIO values: %d\n", ret);
235
236 mutex_unlock(&dev->lock);
237 }
238
239 static int cp2112_gpio_get_all(struct gpio_chip *chip)
240 {
241 struct cp2112_device *dev = gpiochip_get_data(chip);
242 struct hid_device *hdev = dev->hdev;
243 u8 *buf = dev->in_out_buffer;
244 int ret;
245
246 mutex_lock(&dev->lock);
247
248 ret = hid_hw_raw_request(hdev, CP2112_GPIO_GET, buf,
249 CP2112_GPIO_GET_LENGTH, HID_FEATURE_REPORT,
250 HID_REQ_GET_REPORT);
251 if (ret != CP2112_GPIO_GET_LENGTH) {
252 hid_err(hdev, "error requesting GPIO values: %d\n", ret);
253 ret = ret < 0 ? ret : -EIO;
254 goto exit;
255 }
256
257 ret = buf[1];
258
259 exit:
260 mutex_unlock(&dev->lock);
261
262 return ret;
263 }
264
265 static int cp2112_gpio_get(struct gpio_chip *chip, unsigned int offset)
266 {
267 int ret;
268
269 ret = cp2112_gpio_get_all(chip);
270 if (ret < 0)
271 return ret;
272
273 return (ret >> offset) & 1;
274 }
275
276 static int cp2112_gpio_direction_output(struct gpio_chip *chip,
277 unsigned offset, int value)
278 {
279 struct cp2112_device *dev = gpiochip_get_data(chip);
280 struct hid_device *hdev = dev->hdev;
281 u8 *buf = dev->in_out_buffer;
282 int ret;
283
284 mutex_lock(&dev->lock);
285
286 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
287 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
288 HID_REQ_GET_REPORT);
289 if (ret != CP2112_GPIO_CONFIG_LENGTH) {
290 hid_err(hdev, "error requesting GPIO config: %d\n", ret);
291 goto fail;
292 }
293
294 buf[1] |= 1 << offset;
295 buf[2] = gpio_push_pull;
296
297 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
298 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
299 HID_REQ_SET_REPORT);
300 if (ret < 0) {
301 hid_err(hdev, "error setting GPIO config: %d\n", ret);
302 goto fail;
303 }
304
305 mutex_unlock(&dev->lock);
306
307 /*
308 * Set gpio value when output direction is already set,
309 * as specified in AN495, Rev. 0.2, cpt. 4.4
310 */
311 cp2112_gpio_set(chip, offset, value);
312
313 return 0;
314
315 fail:
316 mutex_unlock(&dev->lock);
317 return ret < 0 ? ret : -EIO;
318 }
319
320 static int cp2112_hid_get(struct hid_device *hdev, unsigned char report_number,
321 u8 *data, size_t count, unsigned char report_type)
322 {
323 u8 *buf;
324 int ret;
325
326 buf = kmalloc(count, GFP_KERNEL);
327 if (!buf)
328 return -ENOMEM;
329
330 ret = hid_hw_raw_request(hdev, report_number, buf, count,
331 report_type, HID_REQ_GET_REPORT);
332 memcpy(data, buf, count);
333 kfree(buf);
334 return ret;
335 }
336
337 static int cp2112_hid_output(struct hid_device *hdev, u8 *data, size_t count,
338 unsigned char report_type)
339 {
340 u8 *buf;
341 int ret;
342
343 buf = kmemdup(data, count, GFP_KERNEL);
344 if (!buf)
345 return -ENOMEM;
346
347 if (report_type == HID_OUTPUT_REPORT)
348 ret = hid_hw_output_report(hdev, buf, count);
349 else
350 ret = hid_hw_raw_request(hdev, buf[0], buf, count, report_type,
351 HID_REQ_SET_REPORT);
352
353 kfree(buf);
354 return ret;
355 }
356
357 static int cp2112_wait(struct cp2112_device *dev, atomic_t *avail)
358 {
359 int ret = 0;
360
361 /* We have sent either a CP2112_TRANSFER_STATUS_REQUEST or a
362 * CP2112_DATA_READ_FORCE_SEND and we are waiting for the response to
363 * come in cp2112_raw_event or timeout. There will only be one of these
364 * in flight at any one time. The timeout is extremely large and is a
365 * last resort if the CP2112 has died. If we do timeout we don't expect
366 * to receive the response which would cause data races, it's not like
367 * we can do anything about it anyway.
368 */
369 ret = wait_event_interruptible_timeout(dev->wait,
370 atomic_read(avail), msecs_to_jiffies(RESPONSE_TIMEOUT));
371 if (-ERESTARTSYS == ret)
372 return ret;
373 if (!ret)
374 return -ETIMEDOUT;
375
376 atomic_set(avail, 0);
377 return 0;
378 }
379
380 static int cp2112_xfer_status(struct cp2112_device *dev)
381 {
382 struct hid_device *hdev = dev->hdev;
383 u8 buf[2];
384 int ret;
385
386 buf[0] = CP2112_TRANSFER_STATUS_REQUEST;
387 buf[1] = 0x01;
388 atomic_set(&dev->xfer_avail, 0);
389
390 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT);
391 if (ret < 0) {
392 hid_warn(hdev, "Error requesting status: %d\n", ret);
393 return ret;
394 }
395
396 ret = cp2112_wait(dev, &dev->xfer_avail);
397 if (ret)
398 return ret;
399
400 return dev->xfer_status;
401 }
402
403 static int cp2112_read(struct cp2112_device *dev, u8 *data, size_t size)
404 {
405 struct hid_device *hdev = dev->hdev;
406 struct cp2112_force_read_report report;
407 int ret;
408
409 if (size > sizeof(dev->read_data))
410 size = sizeof(dev->read_data);
411 report.report = CP2112_DATA_READ_FORCE_SEND;
412 report.length = cpu_to_be16(size);
413
414 atomic_set(&dev->read_avail, 0);
415
416 ret = cp2112_hid_output(hdev, &report.report, sizeof(report),
417 HID_OUTPUT_REPORT);
418 if (ret < 0) {
419 hid_warn(hdev, "Error requesting data: %d\n", ret);
420 return ret;
421 }
422
423 ret = cp2112_wait(dev, &dev->read_avail);
424 if (ret)
425 return ret;
426
427 hid_dbg(hdev, "read %d of %zd bytes requested\n",
428 dev->read_length, size);
429
430 if (size > dev->read_length)
431 size = dev->read_length;
432
433 memcpy(data, dev->read_data, size);
434 return dev->read_length;
435 }
436
437 static int cp2112_read_req(void *buf, u8 slave_address, u16 length)
438 {
439 struct cp2112_read_req_report *report = buf;
440
441 if (length < 1 || length > 512)
442 return -EINVAL;
443
444 report->report = CP2112_DATA_READ_REQUEST;
445 report->slave_address = slave_address << 1;
446 report->length = cpu_to_be16(length);
447 return sizeof(*report);
448 }
449
450 static int cp2112_write_read_req(void *buf, u8 slave_address, u16 length,
451 u8 command, u8 *data, u8 data_length)
452 {
453 struct cp2112_write_read_req_report *report = buf;
454
455 if (length < 1 || length > 512
456 || data_length > sizeof(report->target_address) - 1)
457 return -EINVAL;
458
459 report->report = CP2112_DATA_WRITE_READ_REQUEST;
460 report->slave_address = slave_address << 1;
461 report->length = cpu_to_be16(length);
462 report->target_address_length = data_length + 1;
463 report->target_address[0] = command;
464 memcpy(&report->target_address[1], data, data_length);
465 return data_length + 6;
466 }
467
468 static int cp2112_write_req(void *buf, u8 slave_address, u8 command, u8 *data,
469 u8 data_length)
470 {
471 struct cp2112_write_req_report *report = buf;
472
473 if (data_length > sizeof(report->data) - 1)
474 return -EINVAL;
475
476 report->report = CP2112_DATA_WRITE_REQUEST;
477 report->slave_address = slave_address << 1;
478 report->length = data_length + 1;
479 report->data[0] = command;
480 memcpy(&report->data[1], data, data_length);
481 return data_length + 4;
482 }
483
484 static int cp2112_i2c_write_req(void *buf, u8 slave_address, u8 *data,
485 u8 data_length)
486 {
487 struct cp2112_write_req_report *report = buf;
488
489 if (data_length > sizeof(report->data))
490 return -EINVAL;
491
492 report->report = CP2112_DATA_WRITE_REQUEST;
493 report->slave_address = slave_address << 1;
494 report->length = data_length;
495 memcpy(report->data, data, data_length);
496 return data_length + 3;
497 }
498
499 static int cp2112_i2c_write_read_req(void *buf, u8 slave_address,
500 u8 *addr, int addr_length,
501 int read_length)
502 {
503 struct cp2112_write_read_req_report *report = buf;
504
505 if (read_length < 1 || read_length > 512 ||
506 addr_length > sizeof(report->target_address))
507 return -EINVAL;
508
509 report->report = CP2112_DATA_WRITE_READ_REQUEST;
510 report->slave_address = slave_address << 1;
511 report->length = cpu_to_be16(read_length);
512 report->target_address_length = addr_length;
513 memcpy(report->target_address, addr, addr_length);
514 return addr_length + 5;
515 }
516
517 static int cp2112_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
518 int num)
519 {
520 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data;
521 struct hid_device *hdev = dev->hdev;
522 u8 buf[64];
523 ssize_t count;
524 ssize_t read_length = 0;
525 u8 *read_buf = NULL;
526 unsigned int retries;
527 int ret;
528
529 hid_dbg(hdev, "I2C %d messages\n", num);
530
531 if (num == 1) {
532 if (msgs->flags & I2C_M_RD) {
533 hid_dbg(hdev, "I2C read %#04x len %d\n",
534 msgs->addr, msgs->len);
535 read_length = msgs->len;
536 read_buf = msgs->buf;
537 count = cp2112_read_req(buf, msgs->addr, msgs->len);
538 } else {
539 hid_dbg(hdev, "I2C write %#04x len %d\n",
540 msgs->addr, msgs->len);
541 count = cp2112_i2c_write_req(buf, msgs->addr,
542 msgs->buf, msgs->len);
543 }
544 if (count < 0)
545 return count;
546 } else if (dev->hwversion > 1 && /* no repeated start in rev 1 */
547 num == 2 &&
548 msgs[0].addr == msgs[1].addr &&
549 !(msgs[0].flags & I2C_M_RD) && (msgs[1].flags & I2C_M_RD)) {
550 hid_dbg(hdev, "I2C write-read %#04x wlen %d rlen %d\n",
551 msgs[0].addr, msgs[0].len, msgs[1].len);
552 read_length = msgs[1].len;
553 read_buf = msgs[1].buf;
554 count = cp2112_i2c_write_read_req(buf, msgs[0].addr,
555 msgs[0].buf, msgs[0].len, msgs[1].len);
556 if (count < 0)
557 return count;
558 } else {
559 hid_err(hdev,
560 "Multi-message I2C transactions not supported\n");
561 return -EOPNOTSUPP;
562 }
563
564 ret = hid_hw_power(hdev, PM_HINT_FULLON);
565 if (ret < 0) {
566 hid_err(hdev, "power management error: %d\n", ret);
567 return ret;
568 }
569
570 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT);
571 if (ret < 0) {
572 hid_warn(hdev, "Error starting transaction: %d\n", ret);
573 goto power_normal;
574 }
575
576 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) {
577 ret = cp2112_xfer_status(dev);
578 if (-EBUSY == ret)
579 continue;
580 if (ret < 0)
581 goto power_normal;
582 break;
583 }
584
585 if (XFER_STATUS_RETRIES <= retries) {
586 hid_warn(hdev, "Transfer timed out, cancelling.\n");
587 buf[0] = CP2112_CANCEL_TRANSFER;
588 buf[1] = 0x01;
589
590 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT);
591 if (ret < 0)
592 hid_warn(hdev, "Error cancelling transaction: %d\n",
593 ret);
594
595 ret = -ETIMEDOUT;
596 goto power_normal;
597 }
598
599 for (count = 0; count < read_length;) {
600 ret = cp2112_read(dev, read_buf + count, read_length - count);
601 if (ret < 0)
602 goto power_normal;
603 if (ret == 0) {
604 hid_err(hdev, "read returned 0\n");
605 ret = -EIO;
606 goto power_normal;
607 }
608 count += ret;
609 if (count > read_length) {
610 /*
611 * The hardware returned too much data.
612 * This is mostly harmless because cp2112_read()
613 * has a limit check so didn't overrun our
614 * buffer. Nevertheless, we return an error
615 * because something is seriously wrong and
616 * it shouldn't go unnoticed.
617 */
618 hid_err(hdev, "long read: %d > %zd\n",
619 ret, read_length - count + ret);
620 ret = -EIO;
621 goto power_normal;
622 }
623 }
624
625 /* return the number of transferred messages */
626 ret = num;
627
628 power_normal:
629 hid_hw_power(hdev, PM_HINT_NORMAL);
630 hid_dbg(hdev, "I2C transfer finished: %d\n", ret);
631 return ret;
632 }
633
634 static int cp2112_xfer(struct i2c_adapter *adap, u16 addr,
635 unsigned short flags, char read_write, u8 command,
636 int size, union i2c_smbus_data *data)
637 {
638 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data;
639 struct hid_device *hdev = dev->hdev;
640 u8 buf[64];
641 __le16 word;
642 ssize_t count;
643 size_t read_length = 0;
644 unsigned int retries;
645 int ret;
646
647 hid_dbg(hdev, "%s addr 0x%x flags 0x%x cmd 0x%x size %d\n",
648 read_write == I2C_SMBUS_WRITE ? "write" : "read",
649 addr, flags, command, size);
650
651 switch (size) {
652 case I2C_SMBUS_BYTE:
653 read_length = 1;
654
655 if (I2C_SMBUS_READ == read_write)
656 count = cp2112_read_req(buf, addr, read_length);
657 else
658 count = cp2112_write_req(buf, addr, command, NULL,
659 0);
660 break;
661 case I2C_SMBUS_BYTE_DATA:
662 read_length = 1;
663
664 if (I2C_SMBUS_READ == read_write)
665 count = cp2112_write_read_req(buf, addr, read_length,
666 command, NULL, 0);
667 else
668 count = cp2112_write_req(buf, addr, command,
669 &data->byte, 1);
670 break;
671 case I2C_SMBUS_WORD_DATA:
672 read_length = 2;
673 word = cpu_to_le16(data->word);
674
675 if (I2C_SMBUS_READ == read_write)
676 count = cp2112_write_read_req(buf, addr, read_length,
677 command, NULL, 0);
678 else
679 count = cp2112_write_req(buf, addr, command,
680 (u8 *)&word, 2);
681 break;
682 case I2C_SMBUS_PROC_CALL:
683 size = I2C_SMBUS_WORD_DATA;
684 read_write = I2C_SMBUS_READ;
685 read_length = 2;
686 word = cpu_to_le16(data->word);
687
688 count = cp2112_write_read_req(buf, addr, read_length, command,
689 (u8 *)&word, 2);
690 break;
691 case I2C_SMBUS_I2C_BLOCK_DATA:
692 if (read_write == I2C_SMBUS_READ) {
693 read_length = data->block[0];
694 count = cp2112_write_read_req(buf, addr, read_length,
695 command, NULL, 0);
696 } else {
697 count = cp2112_write_req(buf, addr, command,
698 data->block + 1,
699 data->block[0]);
700 }
701 break;
702 case I2C_SMBUS_BLOCK_DATA:
703 if (I2C_SMBUS_READ == read_write) {
704 count = cp2112_write_read_req(buf, addr,
705 I2C_SMBUS_BLOCK_MAX,
706 command, NULL, 0);
707 } else {
708 count = cp2112_write_req(buf, addr, command,
709 data->block,
710 data->block[0] + 1);
711 }
712 break;
713 case I2C_SMBUS_BLOCK_PROC_CALL:
714 size = I2C_SMBUS_BLOCK_DATA;
715 read_write = I2C_SMBUS_READ;
716
717 count = cp2112_write_read_req(buf, addr, I2C_SMBUS_BLOCK_MAX,
718 command, data->block,
719 data->block[0] + 1);
720 break;
721 default:
722 hid_warn(hdev, "Unsupported transaction %d\n", size);
723 return -EOPNOTSUPP;
724 }
725
726 if (count < 0)
727 return count;
728
729 ret = hid_hw_power(hdev, PM_HINT_FULLON);
730 if (ret < 0) {
731 hid_err(hdev, "power management error: %d\n", ret);
732 return ret;
733 }
734
735 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT);
736 if (ret < 0) {
737 hid_warn(hdev, "Error starting transaction: %d\n", ret);
738 goto power_normal;
739 }
740
741 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) {
742 ret = cp2112_xfer_status(dev);
743 if (-EBUSY == ret)
744 continue;
745 if (ret < 0)
746 goto power_normal;
747 break;
748 }
749
750 if (XFER_STATUS_RETRIES <= retries) {
751 hid_warn(hdev, "Transfer timed out, cancelling.\n");
752 buf[0] = CP2112_CANCEL_TRANSFER;
753 buf[1] = 0x01;
754
755 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT);
756 if (ret < 0)
757 hid_warn(hdev, "Error cancelling transaction: %d\n",
758 ret);
759
760 ret = -ETIMEDOUT;
761 goto power_normal;
762 }
763
764 if (I2C_SMBUS_WRITE == read_write) {
765 ret = 0;
766 goto power_normal;
767 }
768
769 if (I2C_SMBUS_BLOCK_DATA == size)
770 read_length = ret;
771
772 ret = cp2112_read(dev, buf, read_length);
773 if (ret < 0)
774 goto power_normal;
775 if (ret != read_length) {
776 hid_warn(hdev, "short read: %d < %zd\n", ret, read_length);
777 ret = -EIO;
778 goto power_normal;
779 }
780
781 switch (size) {
782 case I2C_SMBUS_BYTE:
783 case I2C_SMBUS_BYTE_DATA:
784 data->byte = buf[0];
785 break;
786 case I2C_SMBUS_WORD_DATA:
787 data->word = le16_to_cpup((__le16 *)buf);
788 break;
789 case I2C_SMBUS_I2C_BLOCK_DATA:
790 memcpy(data->block + 1, buf, read_length);
791 break;
792 case I2C_SMBUS_BLOCK_DATA:
793 if (read_length > I2C_SMBUS_BLOCK_MAX) {
794 ret = -EPROTO;
795 goto power_normal;
796 }
797
798 memcpy(data->block, buf, read_length);
799 break;
800 }
801
802 ret = 0;
803 power_normal:
804 hid_hw_power(hdev, PM_HINT_NORMAL);
805 hid_dbg(hdev, "transfer finished: %d\n", ret);
806 return ret;
807 }
808
809 static u32 cp2112_functionality(struct i2c_adapter *adap)
810 {
811 return I2C_FUNC_I2C |
812 I2C_FUNC_SMBUS_BYTE |
813 I2C_FUNC_SMBUS_BYTE_DATA |
814 I2C_FUNC_SMBUS_WORD_DATA |
815 I2C_FUNC_SMBUS_BLOCK_DATA |
816 I2C_FUNC_SMBUS_I2C_BLOCK |
817 I2C_FUNC_SMBUS_PROC_CALL |
818 I2C_FUNC_SMBUS_BLOCK_PROC_CALL;
819 }
820
821 static const struct i2c_algorithm smbus_algorithm = {
822 .master_xfer = cp2112_i2c_xfer,
823 .smbus_xfer = cp2112_xfer,
824 .functionality = cp2112_functionality,
825 };
826
827 static int cp2112_get_usb_config(struct hid_device *hdev,
828 struct cp2112_usb_config_report *cfg)
829 {
830 int ret;
831
832 ret = cp2112_hid_get(hdev, CP2112_USB_CONFIG, (u8 *)cfg, sizeof(*cfg),
833 HID_FEATURE_REPORT);
834 if (ret != sizeof(*cfg)) {
835 hid_err(hdev, "error reading usb config: %d\n", ret);
836 if (ret < 0)
837 return ret;
838 return -EIO;
839 }
840
841 return 0;
842 }
843
844 static int cp2112_set_usb_config(struct hid_device *hdev,
845 struct cp2112_usb_config_report *cfg)
846 {
847 int ret;
848
849 BUG_ON(cfg->report != CP2112_USB_CONFIG);
850
851 ret = cp2112_hid_output(hdev, (u8 *)cfg, sizeof(*cfg),
852 HID_FEATURE_REPORT);
853 if (ret != sizeof(*cfg)) {
854 hid_err(hdev, "error writing usb config: %d\n", ret);
855 if (ret < 0)
856 return ret;
857 return -EIO;
858 }
859
860 return 0;
861 }
862
863 static void chmod_sysfs_attrs(struct hid_device *hdev);
864
865 #define CP2112_CONFIG_ATTR(name, store, format, ...) \
866 static ssize_t name##_store(struct device *kdev, \
867 struct device_attribute *attr, const char *buf, \
868 size_t count) \
869 { \
870 struct hid_device *hdev = to_hid_device(kdev); \
871 struct cp2112_usb_config_report cfg; \
872 int ret = cp2112_get_usb_config(hdev, &cfg); \
873 if (ret) \
874 return ret; \
875 store; \
876 ret = cp2112_set_usb_config(hdev, &cfg); \
877 if (ret) \
878 return ret; \
879 chmod_sysfs_attrs(hdev); \
880 return count; \
881 } \
882 static ssize_t name##_show(struct device *kdev, \
883 struct device_attribute *attr, char *buf) \
884 { \
885 struct hid_device *hdev = to_hid_device(kdev); \
886 struct cp2112_usb_config_report cfg; \
887 int ret = cp2112_get_usb_config(hdev, &cfg); \
888 if (ret) \
889 return ret; \
890 return scnprintf(buf, PAGE_SIZE, format, ##__VA_ARGS__); \
891 } \
892 static DEVICE_ATTR_RW(name);
893
894 CP2112_CONFIG_ATTR(vendor_id, ({
895 u16 vid;
896
897 if (sscanf(buf, "%hi", &vid) != 1)
898 return -EINVAL;
899
900 cfg.vid = cpu_to_le16(vid);
901 cfg.mask = 0x01;
902 }), "0x%04x\n", le16_to_cpu(cfg.vid));
903
904 CP2112_CONFIG_ATTR(product_id, ({
905 u16 pid;
906
907 if (sscanf(buf, "%hi", &pid) != 1)
908 return -EINVAL;
909
910 cfg.pid = cpu_to_le16(pid);
911 cfg.mask = 0x02;
912 }), "0x%04x\n", le16_to_cpu(cfg.pid));
913
914 CP2112_CONFIG_ATTR(max_power, ({
915 int mA;
916
917 if (sscanf(buf, "%i", &mA) != 1)
918 return -EINVAL;
919
920 cfg.max_power = (mA + 1) / 2;
921 cfg.mask = 0x04;
922 }), "%u mA\n", cfg.max_power * 2);
923
924 CP2112_CONFIG_ATTR(power_mode, ({
925 if (sscanf(buf, "%hhi", &cfg.power_mode) != 1)
926 return -EINVAL;
927
928 cfg.mask = 0x08;
929 }), "%u\n", cfg.power_mode);
930
931 CP2112_CONFIG_ATTR(release_version, ({
932 if (sscanf(buf, "%hhi.%hhi", &cfg.release_major, &cfg.release_minor)
933 != 2)
934 return -EINVAL;
935
936 cfg.mask = 0x10;
937 }), "%u.%u\n", cfg.release_major, cfg.release_minor);
938
939 #undef CP2112_CONFIG_ATTR
940
941 struct cp2112_pstring_attribute {
942 struct device_attribute attr;
943 unsigned char report;
944 };
945
946 static ssize_t pstr_store(struct device *kdev,
947 struct device_attribute *kattr, const char *buf,
948 size_t count)
949 {
950 struct hid_device *hdev = to_hid_device(kdev);
951 struct cp2112_pstring_attribute *attr =
952 container_of(kattr, struct cp2112_pstring_attribute, attr);
953 struct cp2112_string_report report;
954 int ret;
955
956 memset(&report, 0, sizeof(report));
957
958 ret = utf8s_to_utf16s(buf, count, UTF16_LITTLE_ENDIAN,
959 report.string, ARRAY_SIZE(report.string));
960 report.report = attr->report;
961 report.length = ret * sizeof(report.string[0]) + 2;
962 report.type = USB_DT_STRING;
963
964 ret = cp2112_hid_output(hdev, &report.report, report.length + 1,
965 HID_FEATURE_REPORT);
966 if (ret != report.length + 1) {
967 hid_err(hdev, "error writing %s string: %d\n", kattr->attr.name,
968 ret);
969 if (ret < 0)
970 return ret;
971 return -EIO;
972 }
973
974 chmod_sysfs_attrs(hdev);
975 return count;
976 }
977
978 static ssize_t pstr_show(struct device *kdev,
979 struct device_attribute *kattr, char *buf)
980 {
981 struct hid_device *hdev = to_hid_device(kdev);
982 struct cp2112_pstring_attribute *attr =
983 container_of(kattr, struct cp2112_pstring_attribute, attr);
984 struct cp2112_string_report report;
985 u8 length;
986 int ret;
987
988 ret = cp2112_hid_get(hdev, attr->report, &report.report,
989 sizeof(report) - 1, HID_FEATURE_REPORT);
990 if (ret < 3) {
991 hid_err(hdev, "error reading %s string: %d\n", kattr->attr.name,
992 ret);
993 if (ret < 0)
994 return ret;
995 return -EIO;
996 }
997
998 if (report.length < 2) {
999 hid_err(hdev, "invalid %s string length: %d\n",
1000 kattr->attr.name, report.length);
1001 return -EIO;
1002 }
1003
1004 length = report.length > ret - 1 ? ret - 1 : report.length;
1005 length = (length - 2) / sizeof(report.string[0]);
1006 ret = utf16s_to_utf8s(report.string, length, UTF16_LITTLE_ENDIAN, buf,
1007 PAGE_SIZE - 1);
1008 buf[ret++] = '\n';
1009 return ret;
1010 }
1011
1012 #define CP2112_PSTR_ATTR(name, _report) \
1013 static struct cp2112_pstring_attribute dev_attr_##name = { \
1014 .attr = __ATTR(name, (S_IWUSR | S_IRUGO), pstr_show, pstr_store), \
1015 .report = _report, \
1016 };
1017
1018 CP2112_PSTR_ATTR(manufacturer, CP2112_MANUFACTURER_STRING);
1019 CP2112_PSTR_ATTR(product, CP2112_PRODUCT_STRING);
1020 CP2112_PSTR_ATTR(serial, CP2112_SERIAL_STRING);
1021
1022 #undef CP2112_PSTR_ATTR
1023
1024 static const struct attribute_group cp2112_attr_group = {
1025 .attrs = (struct attribute *[]){
1026 &dev_attr_vendor_id.attr,
1027 &dev_attr_product_id.attr,
1028 &dev_attr_max_power.attr,
1029 &dev_attr_power_mode.attr,
1030 &dev_attr_release_version.attr,
1031 &dev_attr_manufacturer.attr.attr,
1032 &dev_attr_product.attr.attr,
1033 &dev_attr_serial.attr.attr,
1034 NULL
1035 }
1036 };
1037
1038 /* Chmoding our sysfs attributes is simply a way to expose which fields in the
1039 * PROM have already been programmed. We do not depend on this preventing
1040 * writing to these attributes since the CP2112 will simply ignore writes to
1041 * already-programmed fields. This is why there is no sense in fixing this
1042 * racy behaviour.
1043 */
1044 static void chmod_sysfs_attrs(struct hid_device *hdev)
1045 {
1046 struct attribute **attr;
1047 u8 buf[2];
1048 int ret;
1049
1050 ret = cp2112_hid_get(hdev, CP2112_LOCK_BYTE, buf, sizeof(buf),
1051 HID_FEATURE_REPORT);
1052 if (ret != sizeof(buf)) {
1053 hid_err(hdev, "error reading lock byte: %d\n", ret);
1054 return;
1055 }
1056
1057 for (attr = cp2112_attr_group.attrs; *attr; ++attr) {
1058 umode_t mode = (buf[1] & 1) ? S_IWUSR | S_IRUGO : S_IRUGO;
1059 ret = sysfs_chmod_file(&hdev->dev.kobj, *attr, mode);
1060 if (ret < 0)
1061 hid_err(hdev, "error chmoding sysfs file %s\n",
1062 (*attr)->name);
1063 buf[1] >>= 1;
1064 }
1065 }
1066
1067 static void cp2112_gpio_irq_ack(struct irq_data *d)
1068 {
1069 }
1070
1071 static void cp2112_gpio_irq_mask(struct irq_data *d)
1072 {
1073 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1074 struct cp2112_device *dev = gpiochip_get_data(gc);
1075
1076 __clear_bit(d->hwirq, &dev->irq_mask);
1077 }
1078
1079 static void cp2112_gpio_irq_unmask(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 __set_bit(d->hwirq, &dev->irq_mask);
1085 }
1086
1087 static void cp2112_gpio_poll_callback(struct work_struct *work)
1088 {
1089 struct cp2112_device *dev = container_of(work, struct cp2112_device,
1090 gpio_poll_worker.work);
1091 struct irq_data *d;
1092 u8 gpio_mask;
1093 u8 virqs = (u8)dev->irq_mask;
1094 u32 irq_type;
1095 int irq, virq, ret;
1096
1097 ret = cp2112_gpio_get_all(&dev->gc);
1098 if (ret == -ENODEV) /* the hardware has been disconnected */
1099 return;
1100 if (ret < 0)
1101 goto exit;
1102
1103 gpio_mask = ret;
1104
1105 while (virqs) {
1106 virq = ffs(virqs) - 1;
1107 virqs &= ~BIT(virq);
1108
1109 if (!dev->gc.to_irq)
1110 break;
1111
1112 irq = dev->gc.to_irq(&dev->gc, virq);
1113
1114 d = irq_get_irq_data(irq);
1115 if (!d)
1116 continue;
1117
1118 irq_type = irqd_get_trigger_type(d);
1119
1120 if (gpio_mask & BIT(virq)) {
1121 /* Level High */
1122
1123 if (irq_type & IRQ_TYPE_LEVEL_HIGH)
1124 handle_nested_irq(irq);
1125
1126 if ((irq_type & IRQ_TYPE_EDGE_RISING) &&
1127 !(dev->gpio_prev_state & BIT(virq)))
1128 handle_nested_irq(irq);
1129 } else {
1130 /* Level Low */
1131
1132 if (irq_type & IRQ_TYPE_LEVEL_LOW)
1133 handle_nested_irq(irq);
1134
1135 if ((irq_type & IRQ_TYPE_EDGE_FALLING) &&
1136 (dev->gpio_prev_state & BIT(virq)))
1137 handle_nested_irq(irq);
1138 }
1139 }
1140
1141 dev->gpio_prev_state = gpio_mask;
1142
1143 exit:
1144 if (dev->gpio_poll)
1145 schedule_delayed_work(&dev->gpio_poll_worker, 10);
1146 }
1147
1148
1149 static unsigned int cp2112_gpio_irq_startup(struct irq_data *d)
1150 {
1151 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1152 struct cp2112_device *dev = gpiochip_get_data(gc);
1153
1154 INIT_DELAYED_WORK(&dev->gpio_poll_worker, cp2112_gpio_poll_callback);
1155
1156 if (!dev->gpio_poll) {
1157 dev->gpio_poll = true;
1158 schedule_delayed_work(&dev->gpio_poll_worker, 0);
1159 }
1160
1161 cp2112_gpio_irq_unmask(d);
1162 return 0;
1163 }
1164
1165 static void cp2112_gpio_irq_shutdown(struct irq_data *d)
1166 {
1167 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1168 struct cp2112_device *dev = gpiochip_get_data(gc);
1169
1170 cancel_delayed_work_sync(&dev->gpio_poll_worker);
1171 }
1172
1173 static int cp2112_gpio_irq_type(struct irq_data *d, unsigned int type)
1174 {
1175 return 0;
1176 }
1177
1178 static struct irq_chip cp2112_gpio_irqchip = {
1179 .name = "cp2112-gpio",
1180 .irq_startup = cp2112_gpio_irq_startup,
1181 .irq_shutdown = cp2112_gpio_irq_shutdown,
1182 .irq_ack = cp2112_gpio_irq_ack,
1183 .irq_mask = cp2112_gpio_irq_mask,
1184 .irq_unmask = cp2112_gpio_irq_unmask,
1185 .irq_set_type = cp2112_gpio_irq_type,
1186 };
1187
1188 static int __maybe_unused cp2112_allocate_irq(struct cp2112_device *dev,
1189 int pin)
1190 {
1191 int ret;
1192
1193 if (dev->desc[pin])
1194 return -EINVAL;
1195
1196 dev->desc[pin] = gpiochip_request_own_desc(&dev->gc, pin,
1197 "HID/I2C:Event",
1198 GPIO_ACTIVE_HIGH,
1199 GPIOD_IN);
1200 if (IS_ERR(dev->desc[pin])) {
1201 dev_err(dev->gc.parent, "Failed to request GPIO\n");
1202 return PTR_ERR(dev->desc[pin]);
1203 }
1204
1205 ret = cp2112_gpio_direction_input(&dev->gc, pin);
1206 if (ret < 0) {
1207 dev_err(dev->gc.parent, "Failed to set GPIO to input dir\n");
1208 goto err_desc;
1209 }
1210
1211 ret = gpiochip_lock_as_irq(&dev->gc, pin);
1212 if (ret) {
1213 dev_err(dev->gc.parent, "Failed to lock GPIO as interrupt\n");
1214 goto err_desc;
1215 }
1216
1217 ret = gpiod_to_irq(dev->desc[pin]);
1218 if (ret < 0) {
1219 dev_err(dev->gc.parent, "Failed to translate GPIO to IRQ\n");
1220 goto err_lock;
1221 }
1222
1223 return ret;
1224
1225 err_lock:
1226 gpiochip_unlock_as_irq(&dev->gc, pin);
1227 err_desc:
1228 gpiochip_free_own_desc(dev->desc[pin]);
1229 dev->desc[pin] = NULL;
1230 return ret;
1231 }
1232
1233 static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)
1234 {
1235 struct cp2112_device *dev;
1236 u8 buf[3];
1237 struct cp2112_smbus_config_report config;
1238 int ret;
1239
1240 dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL);
1241 if (!dev)
1242 return -ENOMEM;
1243
1244 dev->in_out_buffer = devm_kzalloc(&hdev->dev, CP2112_REPORT_MAX_LENGTH,
1245 GFP_KERNEL);
1246 if (!dev->in_out_buffer)
1247 return -ENOMEM;
1248
1249 mutex_init(&dev->lock);
1250
1251 ret = hid_parse(hdev);
1252 if (ret) {
1253 hid_err(hdev, "parse failed\n");
1254 return ret;
1255 }
1256
1257 ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
1258 if (ret) {
1259 hid_err(hdev, "hw start failed\n");
1260 return ret;
1261 }
1262
1263 ret = hid_hw_open(hdev);
1264 if (ret) {
1265 hid_err(hdev, "hw open failed\n");
1266 goto err_hid_stop;
1267 }
1268
1269 ret = hid_hw_power(hdev, PM_HINT_FULLON);
1270 if (ret < 0) {
1271 hid_err(hdev, "power management error: %d\n", ret);
1272 goto err_hid_close;
1273 }
1274
1275 ret = cp2112_hid_get(hdev, CP2112_GET_VERSION_INFO, buf, sizeof(buf),
1276 HID_FEATURE_REPORT);
1277 if (ret != sizeof(buf)) {
1278 hid_err(hdev, "error requesting version\n");
1279 if (ret >= 0)
1280 ret = -EIO;
1281 goto err_power_normal;
1282 }
1283
1284 hid_info(hdev, "Part Number: 0x%02X Device Version: 0x%02X\n",
1285 buf[1], buf[2]);
1286
1287 ret = cp2112_hid_get(hdev, CP2112_SMBUS_CONFIG, (u8 *)&config,
1288 sizeof(config), HID_FEATURE_REPORT);
1289 if (ret != sizeof(config)) {
1290 hid_err(hdev, "error requesting SMBus config\n");
1291 if (ret >= 0)
1292 ret = -EIO;
1293 goto err_power_normal;
1294 }
1295
1296 config.retry_time = cpu_to_be16(1);
1297
1298 ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config),
1299 HID_FEATURE_REPORT);
1300 if (ret != sizeof(config)) {
1301 hid_err(hdev, "error setting SMBus config\n");
1302 if (ret >= 0)
1303 ret = -EIO;
1304 goto err_power_normal;
1305 }
1306
1307 hid_set_drvdata(hdev, (void *)dev);
1308 dev->hdev = hdev;
1309 dev->adap.owner = THIS_MODULE;
1310 dev->adap.class = I2C_CLASS_HWMON;
1311 dev->adap.algo = &smbus_algorithm;
1312 dev->adap.algo_data = dev;
1313 dev->adap.dev.parent = &hdev->dev;
1314 snprintf(dev->adap.name, sizeof(dev->adap.name),
1315 "CP2112 SMBus Bridge on hidraw%d",
1316 ((struct hidraw *)hdev->hidraw)->minor);
1317 dev->hwversion = buf[2];
1318 init_waitqueue_head(&dev->wait);
1319
1320 hid_device_io_start(hdev);
1321 ret = i2c_add_adapter(&dev->adap);
1322 hid_device_io_stop(hdev);
1323
1324 if (ret) {
1325 hid_err(hdev, "error registering i2c adapter\n");
1326 goto err_power_normal;
1327 }
1328
1329 hid_dbg(hdev, "adapter registered\n");
1330
1331 dev->gc.label = "cp2112_gpio";
1332 dev->gc.direction_input = cp2112_gpio_direction_input;
1333 dev->gc.direction_output = cp2112_gpio_direction_output;
1334 dev->gc.set = cp2112_gpio_set;
1335 dev->gc.get = cp2112_gpio_get;
1336 dev->gc.base = -1;
1337 dev->gc.ngpio = 8;
1338 dev->gc.can_sleep = 1;
1339 dev->gc.parent = &hdev->dev;
1340
1341 ret = gpiochip_add_data(&dev->gc, dev);
1342 if (ret < 0) {
1343 hid_err(hdev, "error registering gpio chip\n");
1344 goto err_free_i2c;
1345 }
1346
1347 ret = sysfs_create_group(&hdev->dev.kobj, &cp2112_attr_group);
1348 if (ret < 0) {
1349 hid_err(hdev, "error creating sysfs attrs\n");
1350 goto err_gpiochip_remove;
1351 }
1352
1353 chmod_sysfs_attrs(hdev);
1354 hid_hw_power(hdev, PM_HINT_NORMAL);
1355
1356 ret = gpiochip_irqchip_add(&dev->gc, &cp2112_gpio_irqchip, 0,
1357 handle_simple_irq, IRQ_TYPE_NONE);
1358 if (ret) {
1359 dev_err(dev->gc.parent, "failed to add IRQ chip\n");
1360 goto err_sysfs_remove;
1361 }
1362
1363 return ret;
1364
1365 err_sysfs_remove:
1366 sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group);
1367 err_gpiochip_remove:
1368 gpiochip_remove(&dev->gc);
1369 err_free_i2c:
1370 i2c_del_adapter(&dev->adap);
1371 err_power_normal:
1372 hid_hw_power(hdev, PM_HINT_NORMAL);
1373 err_hid_close:
1374 hid_hw_close(hdev);
1375 err_hid_stop:
1376 hid_hw_stop(hdev);
1377 return ret;
1378 }
1379
1380 static void cp2112_remove(struct hid_device *hdev)
1381 {
1382 struct cp2112_device *dev = hid_get_drvdata(hdev);
1383 int i;
1384
1385 sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group);
1386 i2c_del_adapter(&dev->adap);
1387
1388 if (dev->gpio_poll) {
1389 dev->gpio_poll = false;
1390 cancel_delayed_work_sync(&dev->gpio_poll_worker);
1391 }
1392
1393 for (i = 0; i < ARRAY_SIZE(dev->desc); i++) {
1394 gpiochip_unlock_as_irq(&dev->gc, i);
1395 gpiochip_free_own_desc(dev->desc[i]);
1396 }
1397
1398 gpiochip_remove(&dev->gc);
1399 /* i2c_del_adapter has finished removing all i2c devices from our
1400 * adapter. Well behaved devices should no longer call our cp2112_xfer
1401 * and should have waited for any pending calls to finish. It has also
1402 * waited for device_unregister(&adap->dev) to complete. Therefore we
1403 * can safely free our struct cp2112_device.
1404 */
1405 hid_hw_close(hdev);
1406 hid_hw_stop(hdev);
1407 }
1408
1409 static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report,
1410 u8 *data, int size)
1411 {
1412 struct cp2112_device *dev = hid_get_drvdata(hdev);
1413 struct cp2112_xfer_status_report *xfer = (void *)data;
1414
1415 switch (data[0]) {
1416 case CP2112_TRANSFER_STATUS_RESPONSE:
1417 hid_dbg(hdev, "xfer status: %02x %02x %04x %04x\n",
1418 xfer->status0, xfer->status1,
1419 be16_to_cpu(xfer->retries), be16_to_cpu(xfer->length));
1420
1421 switch (xfer->status0) {
1422 case STATUS0_IDLE:
1423 dev->xfer_status = -EAGAIN;
1424 break;
1425 case STATUS0_BUSY:
1426 dev->xfer_status = -EBUSY;
1427 break;
1428 case STATUS0_COMPLETE:
1429 dev->xfer_status = be16_to_cpu(xfer->length);
1430 break;
1431 case STATUS0_ERROR:
1432 switch (xfer->status1) {
1433 case STATUS1_TIMEOUT_NACK:
1434 case STATUS1_TIMEOUT_BUS:
1435 dev->xfer_status = -ETIMEDOUT;
1436 break;
1437 default:
1438 dev->xfer_status = -EIO;
1439 break;
1440 }
1441 break;
1442 default:
1443 dev->xfer_status = -EINVAL;
1444 break;
1445 }
1446
1447 atomic_set(&dev->xfer_avail, 1);
1448 break;
1449 case CP2112_DATA_READ_RESPONSE:
1450 hid_dbg(hdev, "read response: %02x %02x\n", data[1], data[2]);
1451
1452 dev->read_length = data[2];
1453 if (dev->read_length > sizeof(dev->read_data))
1454 dev->read_length = sizeof(dev->read_data);
1455
1456 memcpy(dev->read_data, &data[3], dev->read_length);
1457 atomic_set(&dev->read_avail, 1);
1458 break;
1459 default:
1460 hid_err(hdev, "unknown report\n");
1461
1462 return 0;
1463 }
1464
1465 wake_up_interruptible(&dev->wait);
1466 return 1;
1467 }
1468
1469 static struct hid_driver cp2112_driver = {
1470 .name = "cp2112",
1471 .id_table = cp2112_devices,
1472 .probe = cp2112_probe,
1473 .remove = cp2112_remove,
1474 .raw_event = cp2112_raw_event,
1475 };
1476
1477 module_hid_driver(cp2112_driver);
1478 MODULE_DESCRIPTION("Silicon Labs HID USB to SMBus master bridge");
1479 MODULE_AUTHOR("David Barksdale <dbarksdale@uplogix.com>");
1480 MODULE_LICENSE("GPL");
1481
Linux with added FPC-III support