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Merge branch 'for-linus-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/mason...
[mirror_ubuntu-zesty-kernel.git] / drivers / hid / hid-cp2112.c
1 /*
2 * hid-cp2112.c - Silicon Labs HID USB to SMBus master bridge
3 * Copyright (c) 2013,2014 Uplogix, Inc.
4 * David Barksdale <dbarksdale@uplogix.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 */
15
16 /*
17 * The Silicon Labs CP2112 chip is a USB HID device which provides an
18 * SMBus controller for talking to slave devices and 8 GPIO pins. The
19 * host communicates with the CP2112 via raw HID reports.
20 *
21 * Data Sheet:
22 * http://www.silabs.com/Support%20Documents/TechnicalDocs/CP2112.pdf
23 * Programming Interface Specification:
24 * http://www.silabs.com/Support%20Documents/TechnicalDocs/AN495.pdf
25 */
26
27 #include <linux/gpio.h>
28 #include <linux/gpio/driver.h>
29 #include <linux/hid.h>
30 #include <linux/i2c.h>
31 #include <linux/module.h>
32 #include <linux/nls.h>
33 #include <linux/usb/ch9.h>
34 #include "hid-ids.h"
35
36 #define CP2112_REPORT_MAX_LENGTH 64
37 #define CP2112_GPIO_CONFIG_LENGTH 5
38 #define CP2112_GPIO_GET_LENGTH 2
39 #define CP2112_GPIO_SET_LENGTH 3
40
41 enum {
42 CP2112_GPIO_CONFIG = 0x02,
43 CP2112_GPIO_GET = 0x03,
44 CP2112_GPIO_SET = 0x04,
45 CP2112_GET_VERSION_INFO = 0x05,
46 CP2112_SMBUS_CONFIG = 0x06,
47 CP2112_DATA_READ_REQUEST = 0x10,
48 CP2112_DATA_WRITE_READ_REQUEST = 0x11,
49 CP2112_DATA_READ_FORCE_SEND = 0x12,
50 CP2112_DATA_READ_RESPONSE = 0x13,
51 CP2112_DATA_WRITE_REQUEST = 0x14,
52 CP2112_TRANSFER_STATUS_REQUEST = 0x15,
53 CP2112_TRANSFER_STATUS_RESPONSE = 0x16,
54 CP2112_CANCEL_TRANSFER = 0x17,
55 CP2112_LOCK_BYTE = 0x20,
56 CP2112_USB_CONFIG = 0x21,
57 CP2112_MANUFACTURER_STRING = 0x22,
58 CP2112_PRODUCT_STRING = 0x23,
59 CP2112_SERIAL_STRING = 0x24,
60 };
61
62 enum {
63 STATUS0_IDLE = 0x00,
64 STATUS0_BUSY = 0x01,
65 STATUS0_COMPLETE = 0x02,
66 STATUS0_ERROR = 0x03,
67 };
68
69 enum {
70 STATUS1_TIMEOUT_NACK = 0x00,
71 STATUS1_TIMEOUT_BUS = 0x01,
72 STATUS1_ARBITRATION_LOST = 0x02,
73 STATUS1_READ_INCOMPLETE = 0x03,
74 STATUS1_WRITE_INCOMPLETE = 0x04,
75 STATUS1_SUCCESS = 0x05,
76 };
77
78 struct cp2112_smbus_config_report {
79 u8 report; /* CP2112_SMBUS_CONFIG */
80 __be32 clock_speed; /* Hz */
81 u8 device_address; /* Stored in the upper 7 bits */
82 u8 auto_send_read; /* 1 = enabled, 0 = disabled */
83 __be16 write_timeout; /* ms, 0 = no timeout */
84 __be16 read_timeout; /* ms, 0 = no timeout */
85 u8 scl_low_timeout; /* 1 = enabled, 0 = disabled */
86 __be16 retry_time; /* # of retries, 0 = no limit */
87 } __packed;
88
89 struct cp2112_usb_config_report {
90 u8 report; /* CP2112_USB_CONFIG */
91 __le16 vid; /* Vendor ID */
92 __le16 pid; /* Product ID */
93 u8 max_power; /* Power requested in 2mA units */
94 u8 power_mode; /* 0x00 = bus powered
95 0x01 = self powered & regulator off
96 0x02 = self powered & regulator on */
97 u8 release_major;
98 u8 release_minor;
99 u8 mask; /* What fields to program */
100 } __packed;
101
102 struct cp2112_read_req_report {
103 u8 report; /* CP2112_DATA_READ_REQUEST */
104 u8 slave_address;
105 __be16 length;
106 } __packed;
107
108 struct cp2112_write_read_req_report {
109 u8 report; /* CP2112_DATA_WRITE_READ_REQUEST */
110 u8 slave_address;
111 __be16 length;
112 u8 target_address_length;
113 u8 target_address[16];
114 } __packed;
115
116 struct cp2112_write_req_report {
117 u8 report; /* CP2112_DATA_WRITE_REQUEST */
118 u8 slave_address;
119 u8 length;
120 u8 data[61];
121 } __packed;
122
123 struct cp2112_force_read_report {
124 u8 report; /* CP2112_DATA_READ_FORCE_SEND */
125 __be16 length;
126 } __packed;
127
128 struct cp2112_xfer_status_report {
129 u8 report; /* CP2112_TRANSFER_STATUS_RESPONSE */
130 u8 status0; /* STATUS0_* */
131 u8 status1; /* STATUS1_* */
132 __be16 retries;
133 __be16 length;
134 } __packed;
135
136 struct cp2112_string_report {
137 u8 dummy; /* force .string to be aligned */
138 u8 report; /* CP2112_*_STRING */
139 u8 length; /* length in bytes of everyting after .report */
140 u8 type; /* USB_DT_STRING */
141 wchar_t string[30]; /* UTF16_LITTLE_ENDIAN string */
142 } __packed;
143
144 /* Number of times to request transfer status before giving up waiting for a
145 transfer to complete. This may need to be changed if SMBUS clock, retries,
146 or read/write/scl_low timeout settings are changed. */
147 static const int XFER_STATUS_RETRIES = 10;
148
149 /* Time in ms to wait for a CP2112_DATA_READ_RESPONSE or
150 CP2112_TRANSFER_STATUS_RESPONSE. */
151 static const int RESPONSE_TIMEOUT = 50;
152
153 static const struct hid_device_id cp2112_devices[] = {
154 { HID_USB_DEVICE(USB_VENDOR_ID_CYGNAL, USB_DEVICE_ID_CYGNAL_CP2112) },
155 { }
156 };
157 MODULE_DEVICE_TABLE(hid, cp2112_devices);
158
159 struct cp2112_device {
160 struct i2c_adapter adap;
161 struct hid_device *hdev;
162 wait_queue_head_t wait;
163 u8 read_data[61];
164 u8 read_length;
165 u8 hwversion;
166 int xfer_status;
167 atomic_t read_avail;
168 atomic_t xfer_avail;
169 struct gpio_chip gc;
170 u8 *in_out_buffer;
171 spinlock_t lock;
172
173 struct gpio_desc *desc[8];
174 bool gpio_poll;
175 struct delayed_work gpio_poll_worker;
176 unsigned long irq_mask;
177 u8 gpio_prev_state;
178 };
179
180 static int gpio_push_pull = 0xFF;
181 module_param(gpio_push_pull, int, S_IRUGO | S_IWUSR);
182 MODULE_PARM_DESC(gpio_push_pull, "GPIO push-pull configuration bitmask");
183
184 static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
185 {
186 struct cp2112_device *dev = gpiochip_get_data(chip);
187 struct hid_device *hdev = dev->hdev;
188 u8 *buf = dev->in_out_buffer;
189 unsigned long flags;
190 int ret;
191
192 spin_lock_irqsave(&dev->lock, flags);
193
194 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
195 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
196 HID_REQ_GET_REPORT);
197 if (ret != CP2112_GPIO_CONFIG_LENGTH) {
198 hid_err(hdev, "error requesting GPIO config: %d\n", ret);
199 goto exit;
200 }
201
202 buf[1] &= ~(1 << offset);
203 buf[2] = gpio_push_pull;
204
205 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
206 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
207 HID_REQ_SET_REPORT);
208 if (ret < 0) {
209 hid_err(hdev, "error setting GPIO config: %d\n", ret);
210 goto exit;
211 }
212
213 ret = 0;
214
215 exit:
216 spin_unlock_irqrestore(&dev->lock, flags);
217 return ret <= 0 ? ret : -EIO;
218 }
219
220 static void cp2112_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
221 {
222 struct cp2112_device *dev = gpiochip_get_data(chip);
223 struct hid_device *hdev = dev->hdev;
224 u8 *buf = dev->in_out_buffer;
225 unsigned long flags;
226 int ret;
227
228 spin_lock_irqsave(&dev->lock, flags);
229
230 buf[0] = CP2112_GPIO_SET;
231 buf[1] = value ? 0xff : 0;
232 buf[2] = 1 << offset;
233
234 ret = hid_hw_raw_request(hdev, CP2112_GPIO_SET, buf,
235 CP2112_GPIO_SET_LENGTH, HID_FEATURE_REPORT,
236 HID_REQ_SET_REPORT);
237 if (ret < 0)
238 hid_err(hdev, "error setting GPIO values: %d\n", ret);
239
240 spin_unlock_irqrestore(&dev->lock, flags);
241 }
242
243 static int cp2112_gpio_get_all(struct gpio_chip *chip)
244 {
245 struct cp2112_device *dev = gpiochip_get_data(chip);
246 struct hid_device *hdev = dev->hdev;
247 u8 *buf = dev->in_out_buffer;
248 unsigned long flags;
249 int ret;
250
251 spin_lock_irqsave(&dev->lock, flags);
252
253 ret = hid_hw_raw_request(hdev, CP2112_GPIO_GET, buf,
254 CP2112_GPIO_GET_LENGTH, HID_FEATURE_REPORT,
255 HID_REQ_GET_REPORT);
256 if (ret != CP2112_GPIO_GET_LENGTH) {
257 hid_err(hdev, "error requesting GPIO values: %d\n", ret);
258 ret = ret < 0 ? ret : -EIO;
259 goto exit;
260 }
261
262 ret = buf[1];
263
264 exit:
265 spin_unlock_irqrestore(&dev->lock, flags);
266
267 return ret;
268 }
269
270 static int cp2112_gpio_get(struct gpio_chip *chip, unsigned int offset)
271 {
272 int ret;
273
274 ret = cp2112_gpio_get_all(chip);
275 if (ret < 0)
276 return ret;
277
278 return (ret >> offset) & 1;
279 }
280
281 static int cp2112_gpio_direction_output(struct gpio_chip *chip,
282 unsigned offset, int value)
283 {
284 struct cp2112_device *dev = gpiochip_get_data(chip);
285 struct hid_device *hdev = dev->hdev;
286 u8 *buf = dev->in_out_buffer;
287 unsigned long flags;
288 int ret;
289
290 spin_lock_irqsave(&dev->lock, flags);
291
292 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
293 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
294 HID_REQ_GET_REPORT);
295 if (ret != CP2112_GPIO_CONFIG_LENGTH) {
296 hid_err(hdev, "error requesting GPIO config: %d\n", ret);
297 goto fail;
298 }
299
300 buf[1] |= 1 << offset;
301 buf[2] = gpio_push_pull;
302
303 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
304 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
305 HID_REQ_SET_REPORT);
306 if (ret < 0) {
307 hid_err(hdev, "error setting GPIO config: %d\n", ret);
308 goto fail;
309 }
310
311 spin_unlock_irqrestore(&dev->lock, flags);
312
313 /*
314 * Set gpio value when output direction is already set,
315 * as specified in AN495, Rev. 0.2, cpt. 4.4
316 */
317 cp2112_gpio_set(chip, offset, value);
318
319 return 0;
320
321 fail:
322 spin_unlock_irqrestore(&dev->lock, flags);
323 return ret < 0 ? ret : -EIO;
324 }
325
326 static int cp2112_hid_get(struct hid_device *hdev, unsigned char report_number,
327 u8 *data, size_t count, unsigned char report_type)
328 {
329 u8 *buf;
330 int ret;
331
332 buf = kmalloc(count, GFP_KERNEL);
333 if (!buf)
334 return -ENOMEM;
335
336 ret = hid_hw_raw_request(hdev, report_number, buf, count,
337 report_type, HID_REQ_GET_REPORT);
338 memcpy(data, buf, count);
339 kfree(buf);
340 return ret;
341 }
342
343 static int cp2112_hid_output(struct hid_device *hdev, u8 *data, size_t count,
344 unsigned char report_type)
345 {
346 u8 *buf;
347 int ret;
348
349 buf = kmemdup(data, count, GFP_KERNEL);
350 if (!buf)
351 return -ENOMEM;
352
353 if (report_type == HID_OUTPUT_REPORT)
354 ret = hid_hw_output_report(hdev, buf, count);
355 else
356 ret = hid_hw_raw_request(hdev, buf[0], buf, count, report_type,
357 HID_REQ_SET_REPORT);
358
359 kfree(buf);
360 return ret;
361 }
362
363 static int cp2112_wait(struct cp2112_device *dev, atomic_t *avail)
364 {
365 int ret = 0;
366
367 /* We have sent either a CP2112_TRANSFER_STATUS_REQUEST or a
368 * CP2112_DATA_READ_FORCE_SEND and we are waiting for the response to
369 * come in cp2112_raw_event or timeout. There will only be one of these
370 * in flight at any one time. The timeout is extremely large and is a
371 * last resort if the CP2112 has died. If we do timeout we don't expect
372 * to receive the response which would cause data races, it's not like
373 * we can do anything about it anyway.
374 */
375 ret = wait_event_interruptible_timeout(dev->wait,
376 atomic_read(avail), msecs_to_jiffies(RESPONSE_TIMEOUT));
377 if (-ERESTARTSYS == ret)
378 return ret;
379 if (!ret)
380 return -ETIMEDOUT;
381
382 atomic_set(avail, 0);
383 return 0;
384 }
385
386 static int cp2112_xfer_status(struct cp2112_device *dev)
387 {
388 struct hid_device *hdev = dev->hdev;
389 u8 buf[2];
390 int ret;
391
392 buf[0] = CP2112_TRANSFER_STATUS_REQUEST;
393 buf[1] = 0x01;
394 atomic_set(&dev->xfer_avail, 0);
395
396 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT);
397 if (ret < 0) {
398 hid_warn(hdev, "Error requesting status: %d\n", ret);
399 return ret;
400 }
401
402 ret = cp2112_wait(dev, &dev->xfer_avail);
403 if (ret)
404 return ret;
405
406 return dev->xfer_status;
407 }
408
409 static int cp2112_read(struct cp2112_device *dev, u8 *data, size_t size)
410 {
411 struct hid_device *hdev = dev->hdev;
412 struct cp2112_force_read_report report;
413 int ret;
414
415 if (size > sizeof(dev->read_data))
416 size = sizeof(dev->read_data);
417 report.report = CP2112_DATA_READ_FORCE_SEND;
418 report.length = cpu_to_be16(size);
419
420 atomic_set(&dev->read_avail, 0);
421
422 ret = cp2112_hid_output(hdev, &report.report, sizeof(report),
423 HID_OUTPUT_REPORT);
424 if (ret < 0) {
425 hid_warn(hdev, "Error requesting data: %d\n", ret);
426 return ret;
427 }
428
429 ret = cp2112_wait(dev, &dev->read_avail);
430 if (ret)
431 return ret;
432
433 hid_dbg(hdev, "read %d of %zd bytes requested\n",
434 dev->read_length, size);
435
436 if (size > dev->read_length)
437 size = dev->read_length;
438
439 memcpy(data, dev->read_data, size);
440 return dev->read_length;
441 }
442
443 static int cp2112_read_req(void *buf, u8 slave_address, u16 length)
444 {
445 struct cp2112_read_req_report *report = buf;
446
447 if (length < 1 || length > 512)
448 return -EINVAL;
449
450 report->report = CP2112_DATA_READ_REQUEST;
451 report->slave_address = slave_address << 1;
452 report->length = cpu_to_be16(length);
453 return sizeof(*report);
454 }
455
456 static int cp2112_write_read_req(void *buf, u8 slave_address, u16 length,
457 u8 command, u8 *data, u8 data_length)
458 {
459 struct cp2112_write_read_req_report *report = buf;
460
461 if (length < 1 || length > 512
462 || data_length > sizeof(report->target_address) - 1)
463 return -EINVAL;
464
465 report->report = CP2112_DATA_WRITE_READ_REQUEST;
466 report->slave_address = slave_address << 1;
467 report->length = cpu_to_be16(length);
468 report->target_address_length = data_length + 1;
469 report->target_address[0] = command;
470 memcpy(&report->target_address[1], data, data_length);
471 return data_length + 6;
472 }
473
474 static int cp2112_write_req(void *buf, u8 slave_address, u8 command, u8 *data,
475 u8 data_length)
476 {
477 struct cp2112_write_req_report *report = buf;
478
479 if (data_length > sizeof(report->data) - 1)
480 return -EINVAL;
481
482 report->report = CP2112_DATA_WRITE_REQUEST;
483 report->slave_address = slave_address << 1;
484 report->length = data_length + 1;
485 report->data[0] = command;
486 memcpy(&report->data[1], data, data_length);
487 return data_length + 4;
488 }
489
490 static int cp2112_i2c_write_req(void *buf, u8 slave_address, u8 *data,
491 u8 data_length)
492 {
493 struct cp2112_write_req_report *report = buf;
494
495 if (data_length > sizeof(report->data))
496 return -EINVAL;
497
498 report->report = CP2112_DATA_WRITE_REQUEST;
499 report->slave_address = slave_address << 1;
500 report->length = data_length;
501 memcpy(report->data, data, data_length);
502 return data_length + 3;
503 }
504
505 static int cp2112_i2c_write_read_req(void *buf, u8 slave_address,
506 u8 *addr, int addr_length,
507 int read_length)
508 {
509 struct cp2112_write_read_req_report *report = buf;
510
511 if (read_length < 1 || read_length > 512 ||
512 addr_length > sizeof(report->target_address))
513 return -EINVAL;
514
515 report->report = CP2112_DATA_WRITE_READ_REQUEST;
516 report->slave_address = slave_address << 1;
517 report->length = cpu_to_be16(read_length);
518 report->target_address_length = addr_length;
519 memcpy(report->target_address, addr, addr_length);
520 return addr_length + 5;
521 }
522
523 static int cp2112_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
524 int num)
525 {
526 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data;
527 struct hid_device *hdev = dev->hdev;
528 u8 buf[64];
529 ssize_t count;
530 ssize_t read_length = 0;
531 u8 *read_buf = NULL;
532 unsigned int retries;
533 int ret;
534
535 hid_dbg(hdev, "I2C %d messages\n", num);
536
537 if (num == 1) {
538 if (msgs->flags & I2C_M_RD) {
539 hid_dbg(hdev, "I2C read %#04x len %d\n",
540 msgs->addr, msgs->len);
541 read_length = msgs->len;
542 read_buf = msgs->buf;
543 count = cp2112_read_req(buf, msgs->addr, msgs->len);
544 } else {
545 hid_dbg(hdev, "I2C write %#04x len %d\n",
546 msgs->addr, msgs->len);
547 count = cp2112_i2c_write_req(buf, msgs->addr,
548 msgs->buf, msgs->len);
549 }
550 if (count < 0)
551 return count;
552 } else if (dev->hwversion > 1 && /* no repeated start in rev 1 */
553 num == 2 &&
554 msgs[0].addr == msgs[1].addr &&
555 !(msgs[0].flags & I2C_M_RD) && (msgs[1].flags & I2C_M_RD)) {
556 hid_dbg(hdev, "I2C write-read %#04x wlen %d rlen %d\n",
557 msgs[0].addr, msgs[0].len, msgs[1].len);
558 read_length = msgs[1].len;
559 read_buf = msgs[1].buf;
560 count = cp2112_i2c_write_read_req(buf, msgs[0].addr,
561 msgs[0].buf, msgs[0].len, msgs[1].len);
562 if (count < 0)
563 return count;
564 } else {
565 hid_err(hdev,
566 "Multi-message I2C transactions not supported\n");
567 return -EOPNOTSUPP;
568 }
569
570 ret = hid_hw_power(hdev, PM_HINT_FULLON);
571 if (ret < 0) {
572 hid_err(hdev, "power management error: %d\n", ret);
573 return ret;
574 }
575
576 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT);
577 if (ret < 0) {
578 hid_warn(hdev, "Error starting transaction: %d\n", ret);
579 goto power_normal;
580 }
581
582 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) {
583 ret = cp2112_xfer_status(dev);
584 if (-EBUSY == ret)
585 continue;
586 if (ret < 0)
587 goto power_normal;
588 break;
589 }
590
591 if (XFER_STATUS_RETRIES <= retries) {
592 hid_warn(hdev, "Transfer timed out, cancelling.\n");
593 buf[0] = CP2112_CANCEL_TRANSFER;
594 buf[1] = 0x01;
595
596 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT);
597 if (ret < 0)
598 hid_warn(hdev, "Error cancelling transaction: %d\n",
599 ret);
600
601 ret = -ETIMEDOUT;
602 goto power_normal;
603 }
604
605 for (count = 0; count < read_length;) {
606 ret = cp2112_read(dev, read_buf + count, read_length - count);
607 if (ret < 0)
608 goto power_normal;
609 if (ret == 0) {
610 hid_err(hdev, "read returned 0\n");
611 ret = -EIO;
612 goto power_normal;
613 }
614 count += ret;
615 if (count > read_length) {
616 /*
617 * The hardware returned too much data.
618 * This is mostly harmless because cp2112_read()
619 * has a limit check so didn't overrun our
620 * buffer. Nevertheless, we return an error
621 * because something is seriously wrong and
622 * it shouldn't go unnoticed.
623 */
624 hid_err(hdev, "long read: %d > %zd\n",
625 ret, read_length - count + ret);
626 ret = -EIO;
627 goto power_normal;
628 }
629 }
630
631 /* return the number of transferred messages */
632 ret = num;
633
634 power_normal:
635 hid_hw_power(hdev, PM_HINT_NORMAL);
636 hid_dbg(hdev, "I2C transfer finished: %d\n", ret);
637 return ret;
638 }
639
640 static int cp2112_xfer(struct i2c_adapter *adap, u16 addr,
641 unsigned short flags, char read_write, u8 command,
642 int size, union i2c_smbus_data *data)
643 {
644 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data;
645 struct hid_device *hdev = dev->hdev;
646 u8 buf[64];
647 __le16 word;
648 ssize_t count;
649 size_t read_length = 0;
650 unsigned int retries;
651 int ret;
652
653 hid_dbg(hdev, "%s addr 0x%x flags 0x%x cmd 0x%x size %d\n",
654 read_write == I2C_SMBUS_WRITE ? "write" : "read",
655 addr, flags, command, size);
656
657 switch (size) {
658 case I2C_SMBUS_BYTE:
659 read_length = 1;
660
661 if (I2C_SMBUS_READ == read_write)
662 count = cp2112_read_req(buf, addr, read_length);
663 else
664 count = cp2112_write_req(buf, addr, command, NULL,
665 0);
666 break;
667 case I2C_SMBUS_BYTE_DATA:
668 read_length = 1;
669
670 if (I2C_SMBUS_READ == read_write)
671 count = cp2112_write_read_req(buf, addr, read_length,
672 command, NULL, 0);
673 else
674 count = cp2112_write_req(buf, addr, command,
675 &data->byte, 1);
676 break;
677 case I2C_SMBUS_WORD_DATA:
678 read_length = 2;
679 word = cpu_to_le16(data->word);
680
681 if (I2C_SMBUS_READ == read_write)
682 count = cp2112_write_read_req(buf, addr, read_length,
683 command, NULL, 0);
684 else
685 count = cp2112_write_req(buf, addr, command,
686 (u8 *)&word, 2);
687 break;
688 case I2C_SMBUS_PROC_CALL:
689 size = I2C_SMBUS_WORD_DATA;
690 read_write = I2C_SMBUS_READ;
691 read_length = 2;
692 word = cpu_to_le16(data->word);
693
694 count = cp2112_write_read_req(buf, addr, read_length, command,
695 (u8 *)&word, 2);
696 break;
697 case I2C_SMBUS_I2C_BLOCK_DATA:
698 size = I2C_SMBUS_BLOCK_DATA;
699 /* fallthrough */
700 case I2C_SMBUS_BLOCK_DATA:
701 if (I2C_SMBUS_READ == read_write) {
702 count = cp2112_write_read_req(buf, addr,
703 I2C_SMBUS_BLOCK_MAX,
704 command, NULL, 0);
705 } else {
706 count = cp2112_write_req(buf, addr, command,
707 data->block,
708 data->block[0] + 1);
709 }
710 break;
711 case I2C_SMBUS_BLOCK_PROC_CALL:
712 size = I2C_SMBUS_BLOCK_DATA;
713 read_write = I2C_SMBUS_READ;
714
715 count = cp2112_write_read_req(buf, addr, I2C_SMBUS_BLOCK_MAX,
716 command, data->block,
717 data->block[0] + 1);
718 break;
719 default:
720 hid_warn(hdev, "Unsupported transaction %d\n", size);
721 return -EOPNOTSUPP;
722 }
723
724 if (count < 0)
725 return count;
726
727 ret = hid_hw_power(hdev, PM_HINT_FULLON);
728 if (ret < 0) {
729 hid_err(hdev, "power management error: %d\n", ret);
730 return ret;
731 }
732
733 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT);
734 if (ret < 0) {
735 hid_warn(hdev, "Error starting transaction: %d\n", ret);
736 goto power_normal;
737 }
738
739 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) {
740 ret = cp2112_xfer_status(dev);
741 if (-EBUSY == ret)
742 continue;
743 if (ret < 0)
744 goto power_normal;
745 break;
746 }
747
748 if (XFER_STATUS_RETRIES <= retries) {
749 hid_warn(hdev, "Transfer timed out, cancelling.\n");
750 buf[0] = CP2112_CANCEL_TRANSFER;
751 buf[1] = 0x01;
752
753 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT);
754 if (ret < 0)
755 hid_warn(hdev, "Error cancelling transaction: %d\n",
756 ret);
757
758 ret = -ETIMEDOUT;
759 goto power_normal;
760 }
761
762 if (I2C_SMBUS_WRITE == read_write) {
763 ret = 0;
764 goto power_normal;
765 }
766
767 if (I2C_SMBUS_BLOCK_DATA == size)
768 read_length = ret;
769
770 ret = cp2112_read(dev, buf, read_length);
771 if (ret < 0)
772 goto power_normal;
773 if (ret != read_length) {
774 hid_warn(hdev, "short read: %d < %zd\n", ret, read_length);
775 ret = -EIO;
776 goto power_normal;
777 }
778
779 switch (size) {
780 case I2C_SMBUS_BYTE:
781 case I2C_SMBUS_BYTE_DATA:
782 data->byte = buf[0];
783 break;
784 case I2C_SMBUS_WORD_DATA:
785 data->word = le16_to_cpup((__le16 *)buf);
786 break;
787 case I2C_SMBUS_BLOCK_DATA:
788 if (read_length > I2C_SMBUS_BLOCK_MAX) {
789 ret = -EPROTO;
790 goto power_normal;
791 }
792
793 memcpy(data->block, buf, read_length);
794 break;
795 }
796
797 ret = 0;
798 power_normal:
799 hid_hw_power(hdev, PM_HINT_NORMAL);
800 hid_dbg(hdev, "transfer finished: %d\n", ret);
801 return ret;
802 }
803
804 static u32 cp2112_functionality(struct i2c_adapter *adap)
805 {
806 return I2C_FUNC_I2C |
807 I2C_FUNC_SMBUS_BYTE |
808 I2C_FUNC_SMBUS_BYTE_DATA |
809 I2C_FUNC_SMBUS_WORD_DATA |
810 I2C_FUNC_SMBUS_BLOCK_DATA |
811 I2C_FUNC_SMBUS_I2C_BLOCK |
812 I2C_FUNC_SMBUS_PROC_CALL |
813 I2C_FUNC_SMBUS_BLOCK_PROC_CALL;
814 }
815
816 static const struct i2c_algorithm smbus_algorithm = {
817 .master_xfer = cp2112_i2c_xfer,
818 .smbus_xfer = cp2112_xfer,
819 .functionality = cp2112_functionality,
820 };
821
822 static int cp2112_get_usb_config(struct hid_device *hdev,
823 struct cp2112_usb_config_report *cfg)
824 {
825 int ret;
826
827 ret = cp2112_hid_get(hdev, CP2112_USB_CONFIG, (u8 *)cfg, sizeof(*cfg),
828 HID_FEATURE_REPORT);
829 if (ret != sizeof(*cfg)) {
830 hid_err(hdev, "error reading usb config: %d\n", ret);
831 if (ret < 0)
832 return ret;
833 return -EIO;
834 }
835
836 return 0;
837 }
838
839 static int cp2112_set_usb_config(struct hid_device *hdev,
840 struct cp2112_usb_config_report *cfg)
841 {
842 int ret;
843
844 BUG_ON(cfg->report != CP2112_USB_CONFIG);
845
846 ret = cp2112_hid_output(hdev, (u8 *)cfg, sizeof(*cfg),
847 HID_FEATURE_REPORT);
848 if (ret != sizeof(*cfg)) {
849 hid_err(hdev, "error writing usb config: %d\n", ret);
850 if (ret < 0)
851 return ret;
852 return -EIO;
853 }
854
855 return 0;
856 }
857
858 static void chmod_sysfs_attrs(struct hid_device *hdev);
859
860 #define CP2112_CONFIG_ATTR(name, store, format, ...) \
861 static ssize_t name##_store(struct device *kdev, \
862 struct device_attribute *attr, const char *buf, \
863 size_t count) \
864 { \
865 struct hid_device *hdev = to_hid_device(kdev); \
866 struct cp2112_usb_config_report cfg; \
867 int ret = cp2112_get_usb_config(hdev, &cfg); \
868 if (ret) \
869 return ret; \
870 store; \
871 ret = cp2112_set_usb_config(hdev, &cfg); \
872 if (ret) \
873 return ret; \
874 chmod_sysfs_attrs(hdev); \
875 return count; \
876 } \
877 static ssize_t name##_show(struct device *kdev, \
878 struct device_attribute *attr, char *buf) \
879 { \
880 struct hid_device *hdev = to_hid_device(kdev); \
881 struct cp2112_usb_config_report cfg; \
882 int ret = cp2112_get_usb_config(hdev, &cfg); \
883 if (ret) \
884 return ret; \
885 return scnprintf(buf, PAGE_SIZE, format, ##__VA_ARGS__); \
886 } \
887 static DEVICE_ATTR_RW(name);
888
889 CP2112_CONFIG_ATTR(vendor_id, ({
890 u16 vid;
891
892 if (sscanf(buf, "%hi", &vid) != 1)
893 return -EINVAL;
894
895 cfg.vid = cpu_to_le16(vid);
896 cfg.mask = 0x01;
897 }), "0x%04x\n", le16_to_cpu(cfg.vid));
898
899 CP2112_CONFIG_ATTR(product_id, ({
900 u16 pid;
901
902 if (sscanf(buf, "%hi", &pid) != 1)
903 return -EINVAL;
904
905 cfg.pid = cpu_to_le16(pid);
906 cfg.mask = 0x02;
907 }), "0x%04x\n", le16_to_cpu(cfg.pid));
908
909 CP2112_CONFIG_ATTR(max_power, ({
910 int mA;
911
912 if (sscanf(buf, "%i", &mA) != 1)
913 return -EINVAL;
914
915 cfg.max_power = (mA + 1) / 2;
916 cfg.mask = 0x04;
917 }), "%u mA\n", cfg.max_power * 2);
918
919 CP2112_CONFIG_ATTR(power_mode, ({
920 if (sscanf(buf, "%hhi", &cfg.power_mode) != 1)
921 return -EINVAL;
922
923 cfg.mask = 0x08;
924 }), "%u\n", cfg.power_mode);
925
926 CP2112_CONFIG_ATTR(release_version, ({
927 if (sscanf(buf, "%hhi.%hhi", &cfg.release_major, &cfg.release_minor)
928 != 2)
929 return -EINVAL;
930
931 cfg.mask = 0x10;
932 }), "%u.%u\n", cfg.release_major, cfg.release_minor);
933
934 #undef CP2112_CONFIG_ATTR
935
936 struct cp2112_pstring_attribute {
937 struct device_attribute attr;
938 unsigned char report;
939 };
940
941 static ssize_t pstr_store(struct device *kdev,
942 struct device_attribute *kattr, const char *buf,
943 size_t count)
944 {
945 struct hid_device *hdev = to_hid_device(kdev);
946 struct cp2112_pstring_attribute *attr =
947 container_of(kattr, struct cp2112_pstring_attribute, attr);
948 struct cp2112_string_report report;
949 int ret;
950
951 memset(&report, 0, sizeof(report));
952
953 ret = utf8s_to_utf16s(buf, count, UTF16_LITTLE_ENDIAN,
954 report.string, ARRAY_SIZE(report.string));
955 report.report = attr->report;
956 report.length = ret * sizeof(report.string[0]) + 2;
957 report.type = USB_DT_STRING;
958
959 ret = cp2112_hid_output(hdev, &report.report, report.length + 1,
960 HID_FEATURE_REPORT);
961 if (ret != report.length + 1) {
962 hid_err(hdev, "error writing %s string: %d\n", kattr->attr.name,
963 ret);
964 if (ret < 0)
965 return ret;
966 return -EIO;
967 }
968
969 chmod_sysfs_attrs(hdev);
970 return count;
971 }
972
973 static ssize_t pstr_show(struct device *kdev,
974 struct device_attribute *kattr, char *buf)
975 {
976 struct hid_device *hdev = to_hid_device(kdev);
977 struct cp2112_pstring_attribute *attr =
978 container_of(kattr, struct cp2112_pstring_attribute, attr);
979 struct cp2112_string_report report;
980 u8 length;
981 int ret;
982
983 ret = cp2112_hid_get(hdev, attr->report, &report.report,
984 sizeof(report) - 1, HID_FEATURE_REPORT);
985 if (ret < 3) {
986 hid_err(hdev, "error reading %s string: %d\n", kattr->attr.name,
987 ret);
988 if (ret < 0)
989 return ret;
990 return -EIO;
991 }
992
993 if (report.length < 2) {
994 hid_err(hdev, "invalid %s string length: %d\n",
995 kattr->attr.name, report.length);
996 return -EIO;
997 }
998
999 length = report.length > ret - 1 ? ret - 1 : report.length;
1000 length = (length - 2) / sizeof(report.string[0]);
1001 ret = utf16s_to_utf8s(report.string, length, UTF16_LITTLE_ENDIAN, buf,
1002 PAGE_SIZE - 1);
1003 buf[ret++] = '\n';
1004 return ret;
1005 }
1006
1007 #define CP2112_PSTR_ATTR(name, _report) \
1008 static struct cp2112_pstring_attribute dev_attr_##name = { \
1009 .attr = __ATTR(name, (S_IWUSR | S_IRUGO), pstr_show, pstr_store), \
1010 .report = _report, \
1011 };
1012
1013 CP2112_PSTR_ATTR(manufacturer, CP2112_MANUFACTURER_STRING);
1014 CP2112_PSTR_ATTR(product, CP2112_PRODUCT_STRING);
1015 CP2112_PSTR_ATTR(serial, CP2112_SERIAL_STRING);
1016
1017 #undef CP2112_PSTR_ATTR
1018
1019 static const struct attribute_group cp2112_attr_group = {
1020 .attrs = (struct attribute *[]){
1021 &dev_attr_vendor_id.attr,
1022 &dev_attr_product_id.attr,
1023 &dev_attr_max_power.attr,
1024 &dev_attr_power_mode.attr,
1025 &dev_attr_release_version.attr,
1026 &dev_attr_manufacturer.attr.attr,
1027 &dev_attr_product.attr.attr,
1028 &dev_attr_serial.attr.attr,
1029 NULL
1030 }
1031 };
1032
1033 /* Chmoding our sysfs attributes is simply a way to expose which fields in the
1034 * PROM have already been programmed. We do not depend on this preventing
1035 * writing to these attributes since the CP2112 will simply ignore writes to
1036 * already-programmed fields. This is why there is no sense in fixing this
1037 * racy behaviour.
1038 */
1039 static void chmod_sysfs_attrs(struct hid_device *hdev)
1040 {
1041 struct attribute **attr;
1042 u8 buf[2];
1043 int ret;
1044
1045 ret = cp2112_hid_get(hdev, CP2112_LOCK_BYTE, buf, sizeof(buf),
1046 HID_FEATURE_REPORT);
1047 if (ret != sizeof(buf)) {
1048 hid_err(hdev, "error reading lock byte: %d\n", ret);
1049 return;
1050 }
1051
1052 for (attr = cp2112_attr_group.attrs; *attr; ++attr) {
1053 umode_t mode = (buf[1] & 1) ? S_IWUSR | S_IRUGO : S_IRUGO;
1054 ret = sysfs_chmod_file(&hdev->dev.kobj, *attr, mode);
1055 if (ret < 0)
1056 hid_err(hdev, "error chmoding sysfs file %s\n",
1057 (*attr)->name);
1058 buf[1] >>= 1;
1059 }
1060 }
1061
1062 static void cp2112_gpio_irq_ack(struct irq_data *d)
1063 {
1064 }
1065
1066 static void cp2112_gpio_irq_mask(struct irq_data *d)
1067 {
1068 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1069 struct cp2112_device *dev = gpiochip_get_data(gc);
1070
1071 __clear_bit(d->hwirq, &dev->irq_mask);
1072 }
1073
1074 static void cp2112_gpio_irq_unmask(struct irq_data *d)
1075 {
1076 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1077 struct cp2112_device *dev = gpiochip_get_data(gc);
1078
1079 __set_bit(d->hwirq, &dev->irq_mask);
1080 }
1081
1082 static void cp2112_gpio_poll_callback(struct work_struct *work)
1083 {
1084 struct cp2112_device *dev = container_of(work, struct cp2112_device,
1085 gpio_poll_worker.work);
1086 struct irq_data *d;
1087 u8 gpio_mask;
1088 u8 virqs = (u8)dev->irq_mask;
1089 u32 irq_type;
1090 int irq, virq, ret;
1091
1092 ret = cp2112_gpio_get_all(&dev->gc);
1093 if (ret == -ENODEV) /* the hardware has been disconnected */
1094 return;
1095 if (ret < 0)
1096 goto exit;
1097
1098 gpio_mask = ret;
1099
1100 while (virqs) {
1101 virq = ffs(virqs) - 1;
1102 virqs &= ~BIT(virq);
1103
1104 if (!dev->gc.to_irq)
1105 break;
1106
1107 irq = dev->gc.to_irq(&dev->gc, virq);
1108
1109 d = irq_get_irq_data(irq);
1110 if (!d)
1111 continue;
1112
1113 irq_type = irqd_get_trigger_type(d);
1114
1115 if (gpio_mask & BIT(virq)) {
1116 /* Level High */
1117
1118 if (irq_type & IRQ_TYPE_LEVEL_HIGH)
1119 handle_nested_irq(irq);
1120
1121 if ((irq_type & IRQ_TYPE_EDGE_RISING) &&
1122 !(dev->gpio_prev_state & BIT(virq)))
1123 handle_nested_irq(irq);
1124 } else {
1125 /* Level Low */
1126
1127 if (irq_type & IRQ_TYPE_LEVEL_LOW)
1128 handle_nested_irq(irq);
1129
1130 if ((irq_type & IRQ_TYPE_EDGE_FALLING) &&
1131 (dev->gpio_prev_state & BIT(virq)))
1132 handle_nested_irq(irq);
1133 }
1134 }
1135
1136 dev->gpio_prev_state = gpio_mask;
1137
1138 exit:
1139 if (dev->gpio_poll)
1140 schedule_delayed_work(&dev->gpio_poll_worker, 10);
1141 }
1142
1143
1144 static unsigned int cp2112_gpio_irq_startup(struct irq_data *d)
1145 {
1146 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1147 struct cp2112_device *dev = gpiochip_get_data(gc);
1148
1149 INIT_DELAYED_WORK(&dev->gpio_poll_worker, cp2112_gpio_poll_callback);
1150
1151 cp2112_gpio_direction_input(gc, d->hwirq);
1152
1153 if (!dev->gpio_poll) {
1154 dev->gpio_poll = true;
1155 schedule_delayed_work(&dev->gpio_poll_worker, 0);
1156 }
1157
1158 cp2112_gpio_irq_unmask(d);
1159 return 0;
1160 }
1161
1162 static void cp2112_gpio_irq_shutdown(struct irq_data *d)
1163 {
1164 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1165 struct cp2112_device *dev = gpiochip_get_data(gc);
1166
1167 cancel_delayed_work_sync(&dev->gpio_poll_worker);
1168 }
1169
1170 static int cp2112_gpio_irq_type(struct irq_data *d, unsigned int type)
1171 {
1172 return 0;
1173 }
1174
1175 static struct irq_chip cp2112_gpio_irqchip = {
1176 .name = "cp2112-gpio",
1177 .irq_startup = cp2112_gpio_irq_startup,
1178 .irq_shutdown = cp2112_gpio_irq_shutdown,
1179 .irq_ack = cp2112_gpio_irq_ack,
1180 .irq_mask = cp2112_gpio_irq_mask,
1181 .irq_unmask = cp2112_gpio_irq_unmask,
1182 .irq_set_type = cp2112_gpio_irq_type,
1183 };
1184
1185 static int __maybe_unused cp2112_allocate_irq(struct cp2112_device *dev,
1186 int pin)
1187 {
1188 int ret;
1189
1190 if (dev->desc[pin])
1191 return -EINVAL;
1192
1193 dev->desc[pin] = gpiochip_request_own_desc(&dev->gc, pin,
1194 "HID/I2C:Event");
1195 if (IS_ERR(dev->desc[pin])) {
1196 dev_err(dev->gc.parent, "Failed to request GPIO\n");
1197 return PTR_ERR(dev->desc[pin]);
1198 }
1199
1200 ret = gpiochip_lock_as_irq(&dev->gc, pin);
1201 if (ret) {
1202 dev_err(dev->gc.parent, "Failed to lock GPIO as interrupt\n");
1203 goto err_desc;
1204 }
1205
1206 ret = gpiod_to_irq(dev->desc[pin]);
1207 if (ret < 0) {
1208 dev_err(dev->gc.parent, "Failed to translate GPIO to IRQ\n");
1209 goto err_lock;
1210 }
1211
1212 return ret;
1213
1214 err_lock:
1215 gpiochip_unlock_as_irq(&dev->gc, pin);
1216 err_desc:
1217 gpiochip_free_own_desc(dev->desc[pin]);
1218 dev->desc[pin] = NULL;
1219 return ret;
1220 }
1221
1222 static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)
1223 {
1224 struct cp2112_device *dev;
1225 u8 buf[3];
1226 struct cp2112_smbus_config_report config;
1227 int ret;
1228
1229 dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL);
1230 if (!dev)
1231 return -ENOMEM;
1232
1233 dev->in_out_buffer = devm_kzalloc(&hdev->dev, CP2112_REPORT_MAX_LENGTH,
1234 GFP_KERNEL);
1235 if (!dev->in_out_buffer)
1236 return -ENOMEM;
1237
1238 spin_lock_init(&dev->lock);
1239
1240 ret = hid_parse(hdev);
1241 if (ret) {
1242 hid_err(hdev, "parse failed\n");
1243 return ret;
1244 }
1245
1246 ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
1247 if (ret) {
1248 hid_err(hdev, "hw start failed\n");
1249 return ret;
1250 }
1251
1252 ret = hid_hw_open(hdev);
1253 if (ret) {
1254 hid_err(hdev, "hw open failed\n");
1255 goto err_hid_stop;
1256 }
1257
1258 ret = hid_hw_power(hdev, PM_HINT_FULLON);
1259 if (ret < 0) {
1260 hid_err(hdev, "power management error: %d\n", ret);
1261 goto err_hid_close;
1262 }
1263
1264 ret = cp2112_hid_get(hdev, CP2112_GET_VERSION_INFO, buf, sizeof(buf),
1265 HID_FEATURE_REPORT);
1266 if (ret != sizeof(buf)) {
1267 hid_err(hdev, "error requesting version\n");
1268 if (ret >= 0)
1269 ret = -EIO;
1270 goto err_power_normal;
1271 }
1272
1273 hid_info(hdev, "Part Number: 0x%02X Device Version: 0x%02X\n",
1274 buf[1], buf[2]);
1275
1276 ret = cp2112_hid_get(hdev, CP2112_SMBUS_CONFIG, (u8 *)&config,
1277 sizeof(config), HID_FEATURE_REPORT);
1278 if (ret != sizeof(config)) {
1279 hid_err(hdev, "error requesting SMBus config\n");
1280 if (ret >= 0)
1281 ret = -EIO;
1282 goto err_power_normal;
1283 }
1284
1285 config.retry_time = cpu_to_be16(1);
1286
1287 ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config),
1288 HID_FEATURE_REPORT);
1289 if (ret != sizeof(config)) {
1290 hid_err(hdev, "error setting SMBus config\n");
1291 if (ret >= 0)
1292 ret = -EIO;
1293 goto err_power_normal;
1294 }
1295
1296 hid_set_drvdata(hdev, (void *)dev);
1297 dev->hdev = hdev;
1298 dev->adap.owner = THIS_MODULE;
1299 dev->adap.class = I2C_CLASS_HWMON;
1300 dev->adap.algo = &smbus_algorithm;
1301 dev->adap.algo_data = dev;
1302 dev->adap.dev.parent = &hdev->dev;
1303 snprintf(dev->adap.name, sizeof(dev->adap.name),
1304 "CP2112 SMBus Bridge on hiddev%d", hdev->minor);
1305 dev->hwversion = buf[2];
1306 init_waitqueue_head(&dev->wait);
1307
1308 hid_device_io_start(hdev);
1309 ret = i2c_add_adapter(&dev->adap);
1310 hid_device_io_stop(hdev);
1311
1312 if (ret) {
1313 hid_err(hdev, "error registering i2c adapter\n");
1314 goto err_power_normal;
1315 }
1316
1317 hid_dbg(hdev, "adapter registered\n");
1318
1319 dev->gc.label = "cp2112_gpio";
1320 dev->gc.direction_input = cp2112_gpio_direction_input;
1321 dev->gc.direction_output = cp2112_gpio_direction_output;
1322 dev->gc.set = cp2112_gpio_set;
1323 dev->gc.get = cp2112_gpio_get;
1324 dev->gc.base = -1;
1325 dev->gc.ngpio = 8;
1326 dev->gc.can_sleep = 1;
1327 dev->gc.parent = &hdev->dev;
1328
1329 ret = gpiochip_add_data(&dev->gc, dev);
1330 if (ret < 0) {
1331 hid_err(hdev, "error registering gpio chip\n");
1332 goto err_free_i2c;
1333 }
1334
1335 ret = sysfs_create_group(&hdev->dev.kobj, &cp2112_attr_group);
1336 if (ret < 0) {
1337 hid_err(hdev, "error creating sysfs attrs\n");
1338 goto err_gpiochip_remove;
1339 }
1340
1341 chmod_sysfs_attrs(hdev);
1342 hid_hw_power(hdev, PM_HINT_NORMAL);
1343
1344 ret = gpiochip_irqchip_add(&dev->gc, &cp2112_gpio_irqchip, 0,
1345 handle_simple_irq, IRQ_TYPE_NONE);
1346 if (ret) {
1347 dev_err(dev->gc.parent, "failed to add IRQ chip\n");
1348 goto err_sysfs_remove;
1349 }
1350
1351 return ret;
1352
1353 err_sysfs_remove:
1354 sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group);
1355 err_gpiochip_remove:
1356 gpiochip_remove(&dev->gc);
1357 err_free_i2c:
1358 i2c_del_adapter(&dev->adap);
1359 err_power_normal:
1360 hid_hw_power(hdev, PM_HINT_NORMAL);
1361 err_hid_close:
1362 hid_hw_close(hdev);
1363 err_hid_stop:
1364 hid_hw_stop(hdev);
1365 return ret;
1366 }
1367
1368 static void cp2112_remove(struct hid_device *hdev)
1369 {
1370 struct cp2112_device *dev = hid_get_drvdata(hdev);
1371 int i;
1372
1373 sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group);
1374 i2c_del_adapter(&dev->adap);
1375
1376 if (dev->gpio_poll) {
1377 dev->gpio_poll = false;
1378 cancel_delayed_work_sync(&dev->gpio_poll_worker);
1379 }
1380
1381 for (i = 0; i < ARRAY_SIZE(dev->desc); i++) {
1382 gpiochip_unlock_as_irq(&dev->gc, i);
1383 gpiochip_free_own_desc(dev->desc[i]);
1384 }
1385
1386 gpiochip_remove(&dev->gc);
1387 /* i2c_del_adapter has finished removing all i2c devices from our
1388 * adapter. Well behaved devices should no longer call our cp2112_xfer
1389 * and should have waited for any pending calls to finish. It has also
1390 * waited for device_unregister(&adap->dev) to complete. Therefore we
1391 * can safely free our struct cp2112_device.
1392 */
1393 hid_hw_close(hdev);
1394 hid_hw_stop(hdev);
1395 }
1396
1397 static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report,
1398 u8 *data, int size)
1399 {
1400 struct cp2112_device *dev = hid_get_drvdata(hdev);
1401 struct cp2112_xfer_status_report *xfer = (void *)data;
1402
1403 switch (data[0]) {
1404 case CP2112_TRANSFER_STATUS_RESPONSE:
1405 hid_dbg(hdev, "xfer status: %02x %02x %04x %04x\n",
1406 xfer->status0, xfer->status1,
1407 be16_to_cpu(xfer->retries), be16_to_cpu(xfer->length));
1408
1409 switch (xfer->status0) {
1410 case STATUS0_IDLE:
1411 dev->xfer_status = -EAGAIN;
1412 break;
1413 case STATUS0_BUSY:
1414 dev->xfer_status = -EBUSY;
1415 break;
1416 case STATUS0_COMPLETE:
1417 dev->xfer_status = be16_to_cpu(xfer->length);
1418 break;
1419 case STATUS0_ERROR:
1420 switch (xfer->status1) {
1421 case STATUS1_TIMEOUT_NACK:
1422 case STATUS1_TIMEOUT_BUS:
1423 dev->xfer_status = -ETIMEDOUT;
1424 break;
1425 default:
1426 dev->xfer_status = -EIO;
1427 break;
1428 }
1429 break;
1430 default:
1431 dev->xfer_status = -EINVAL;
1432 break;
1433 }
1434
1435 atomic_set(&dev->xfer_avail, 1);
1436 break;
1437 case CP2112_DATA_READ_RESPONSE:
1438 hid_dbg(hdev, "read response: %02x %02x\n", data[1], data[2]);
1439
1440 dev->read_length = data[2];
1441 if (dev->read_length > sizeof(dev->read_data))
1442 dev->read_length = sizeof(dev->read_data);
1443
1444 memcpy(dev->read_data, &data[3], dev->read_length);
1445 atomic_set(&dev->read_avail, 1);
1446 break;
1447 default:
1448 hid_err(hdev, "unknown report\n");
1449
1450 return 0;
1451 }
1452
1453 wake_up_interruptible(&dev->wait);
1454 return 1;
1455 }
1456
1457 static struct hid_driver cp2112_driver = {
1458 .name = "cp2112",
1459 .id_table = cp2112_devices,
1460 .probe = cp2112_probe,
1461 .remove = cp2112_remove,
1462 .raw_event = cp2112_raw_event,
1463 };
1464
1465 module_hid_driver(cp2112_driver);
1466 MODULE_DESCRIPTION("Silicon Labs HID USB to SMBus master bridge");
1467 MODULE_AUTHOR("David Barksdale <dbarksdale@uplogix.com>");
1468 MODULE_LICENSE("GPL");
1469
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