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Merge tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm
[mirror_ubuntu-kernels.git] / drivers / hid / hid-cp2112.c
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 * https://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 struct irq_chip irq;
165 u8 *in_out_buffer;
166 struct mutex lock;
167
168 struct gpio_desc *desc[8];
169 bool gpio_poll;
170 struct delayed_work gpio_poll_worker;
171 unsigned long irq_mask;
172 u8 gpio_prev_state;
173 };
174
175 static int gpio_push_pull = 0xFF;
176 module_param(gpio_push_pull, int, S_IRUGO | S_IWUSR);
177 MODULE_PARM_DESC(gpio_push_pull, "GPIO push-pull configuration bitmask");
178
179 static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
180 {
181 struct cp2112_device *dev = gpiochip_get_data(chip);
182 struct hid_device *hdev = dev->hdev;
183 u8 *buf = dev->in_out_buffer;
184 int ret;
185
186 mutex_lock(&dev->lock);
187
188 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
189 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
190 HID_REQ_GET_REPORT);
191 if (ret != CP2112_GPIO_CONFIG_LENGTH) {
192 hid_err(hdev, "error requesting GPIO config: %d\n", ret);
193 if (ret >= 0)
194 ret = -EIO;
195 goto exit;
196 }
197
198 buf[1] &= ~(1 << offset);
199 buf[2] = gpio_push_pull;
200
201 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
202 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
203 HID_REQ_SET_REPORT);
204 if (ret != CP2112_GPIO_CONFIG_LENGTH) {
205 hid_err(hdev, "error setting GPIO config: %d\n", ret);
206 if (ret >= 0)
207 ret = -EIO;
208 goto exit;
209 }
210
211 ret = 0;
212
213 exit:
214 mutex_unlock(&dev->lock);
215 return ret;
216 }
217
218 static void cp2112_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
219 {
220 struct cp2112_device *dev = gpiochip_get_data(chip);
221 struct hid_device *hdev = dev->hdev;
222 u8 *buf = dev->in_out_buffer;
223 int ret;
224
225 mutex_lock(&dev->lock);
226
227 buf[0] = CP2112_GPIO_SET;
228 buf[1] = value ? 0xff : 0;
229 buf[2] = 1 << offset;
230
231 ret = hid_hw_raw_request(hdev, CP2112_GPIO_SET, buf,
232 CP2112_GPIO_SET_LENGTH, HID_FEATURE_REPORT,
233 HID_REQ_SET_REPORT);
234 if (ret < 0)
235 hid_err(hdev, "error setting GPIO values: %d\n", ret);
236
237 mutex_unlock(&dev->lock);
238 }
239
240 static int cp2112_gpio_get_all(struct gpio_chip *chip)
241 {
242 struct cp2112_device *dev = gpiochip_get_data(chip);
243 struct hid_device *hdev = dev->hdev;
244 u8 *buf = dev->in_out_buffer;
245 int ret;
246
247 mutex_lock(&dev->lock);
248
249 ret = hid_hw_raw_request(hdev, CP2112_GPIO_GET, buf,
250 CP2112_GPIO_GET_LENGTH, HID_FEATURE_REPORT,
251 HID_REQ_GET_REPORT);
252 if (ret != CP2112_GPIO_GET_LENGTH) {
253 hid_err(hdev, "error requesting GPIO values: %d\n", ret);
254 ret = ret < 0 ? ret : -EIO;
255 goto exit;
256 }
257
258 ret = buf[1];
259
260 exit:
261 mutex_unlock(&dev->lock);
262
263 return ret;
264 }
265
266 static int cp2112_gpio_get(struct gpio_chip *chip, unsigned int offset)
267 {
268 int ret;
269
270 ret = cp2112_gpio_get_all(chip);
271 if (ret < 0)
272 return ret;
273
274 return (ret >> offset) & 1;
275 }
276
277 static int cp2112_gpio_direction_output(struct gpio_chip *chip,
278 unsigned offset, int value)
279 {
280 struct cp2112_device *dev = gpiochip_get_data(chip);
281 struct hid_device *hdev = dev->hdev;
282 u8 *buf = dev->in_out_buffer;
283 int ret;
284
285 mutex_lock(&dev->lock);
286
287 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
288 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
289 HID_REQ_GET_REPORT);
290 if (ret != CP2112_GPIO_CONFIG_LENGTH) {
291 hid_err(hdev, "error requesting GPIO config: %d\n", ret);
292 goto fail;
293 }
294
295 buf[1] |= 1 << offset;
296 buf[2] = gpio_push_pull;
297
298 ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
299 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
300 HID_REQ_SET_REPORT);
301 if (ret < 0) {
302 hid_err(hdev, "error setting GPIO config: %d\n", ret);
303 goto fail;
304 }
305
306 mutex_unlock(&dev->lock);
307
308 /*
309 * Set gpio value when output direction is already set,
310 * as specified in AN495, Rev. 0.2, cpt. 4.4
311 */
312 cp2112_gpio_set(chip, offset, value);
313
314 return 0;
315
316 fail:
317 mutex_unlock(&dev->lock);
318 return ret < 0 ? ret : -EIO;
319 }
320
321 static int cp2112_hid_get(struct hid_device *hdev, unsigned char report_number,
322 u8 *data, size_t count, unsigned char report_type)
323 {
324 u8 *buf;
325 int ret;
326
327 buf = kmalloc(count, GFP_KERNEL);
328 if (!buf)
329 return -ENOMEM;
330
331 ret = hid_hw_raw_request(hdev, report_number, buf, count,
332 report_type, HID_REQ_GET_REPORT);
333 memcpy(data, buf, count);
334 kfree(buf);
335 return ret;
336 }
337
338 static int cp2112_hid_output(struct hid_device *hdev, u8 *data, size_t count,
339 unsigned char report_type)
340 {
341 u8 *buf;
342 int ret;
343
344 buf = kmemdup(data, count, GFP_KERNEL);
345 if (!buf)
346 return -ENOMEM;
347
348 if (report_type == HID_OUTPUT_REPORT)
349 ret = hid_hw_output_report(hdev, buf, count);
350 else
351 ret = hid_hw_raw_request(hdev, buf[0], buf, count, report_type,
352 HID_REQ_SET_REPORT);
353
354 kfree(buf);
355 return ret;
356 }
357
358 static int cp2112_wait(struct cp2112_device *dev, atomic_t *avail)
359 {
360 int ret = 0;
361
362 /* We have sent either a CP2112_TRANSFER_STATUS_REQUEST or a
363 * CP2112_DATA_READ_FORCE_SEND and we are waiting for the response to
364 * come in cp2112_raw_event or timeout. There will only be one of these
365 * in flight at any one time. The timeout is extremely large and is a
366 * last resort if the CP2112 has died. If we do timeout we don't expect
367 * to receive the response which would cause data races, it's not like
368 * we can do anything about it anyway.
369 */
370 ret = wait_event_interruptible_timeout(dev->wait,
371 atomic_read(avail), msecs_to_jiffies(RESPONSE_TIMEOUT));
372 if (-ERESTARTSYS == ret)
373 return ret;
374 if (!ret)
375 return -ETIMEDOUT;
376
377 atomic_set(avail, 0);
378 return 0;
379 }
380
381 static int cp2112_xfer_status(struct cp2112_device *dev)
382 {
383 struct hid_device *hdev = dev->hdev;
384 u8 buf[2];
385 int ret;
386
387 buf[0] = CP2112_TRANSFER_STATUS_REQUEST;
388 buf[1] = 0x01;
389 atomic_set(&dev->xfer_avail, 0);
390
391 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT);
392 if (ret < 0) {
393 hid_warn(hdev, "Error requesting status: %d\n", ret);
394 return ret;
395 }
396
397 ret = cp2112_wait(dev, &dev->xfer_avail);
398 if (ret)
399 return ret;
400
401 return dev->xfer_status;
402 }
403
404 static int cp2112_read(struct cp2112_device *dev, u8 *data, size_t size)
405 {
406 struct hid_device *hdev = dev->hdev;
407 struct cp2112_force_read_report report;
408 int ret;
409
410 if (size > sizeof(dev->read_data))
411 size = sizeof(dev->read_data);
412 report.report = CP2112_DATA_READ_FORCE_SEND;
413 report.length = cpu_to_be16(size);
414
415 atomic_set(&dev->read_avail, 0);
416
417 ret = cp2112_hid_output(hdev, &report.report, sizeof(report),
418 HID_OUTPUT_REPORT);
419 if (ret < 0) {
420 hid_warn(hdev, "Error requesting data: %d\n", ret);
421 return ret;
422 }
423
424 ret = cp2112_wait(dev, &dev->read_avail);
425 if (ret)
426 return ret;
427
428 hid_dbg(hdev, "read %d of %zd bytes requested\n",
429 dev->read_length, size);
430
431 if (size > dev->read_length)
432 size = dev->read_length;
433
434 memcpy(data, dev->read_data, size);
435 return dev->read_length;
436 }
437
438 static int cp2112_read_req(void *buf, u8 slave_address, u16 length)
439 {
440 struct cp2112_read_req_report *report = buf;
441
442 if (length < 1 || length > 512)
443 return -EINVAL;
444
445 report->report = CP2112_DATA_READ_REQUEST;
446 report->slave_address = slave_address << 1;
447 report->length = cpu_to_be16(length);
448 return sizeof(*report);
449 }
450
451 static int cp2112_write_read_req(void *buf, u8 slave_address, u16 length,
452 u8 command, u8 *data, u8 data_length)
453 {
454 struct cp2112_write_read_req_report *report = buf;
455
456 if (length < 1 || length > 512
457 || data_length > sizeof(report->target_address) - 1)
458 return -EINVAL;
459
460 report->report = CP2112_DATA_WRITE_READ_REQUEST;
461 report->slave_address = slave_address << 1;
462 report->length = cpu_to_be16(length);
463 report->target_address_length = data_length + 1;
464 report->target_address[0] = command;
465 memcpy(&report->target_address[1], data, data_length);
466 return data_length + 6;
467 }
468
469 static int cp2112_write_req(void *buf, u8 slave_address, u8 command, u8 *data,
470 u8 data_length)
471 {
472 struct cp2112_write_req_report *report = buf;
473
474 if (data_length > sizeof(report->data) - 1)
475 return -EINVAL;
476
477 report->report = CP2112_DATA_WRITE_REQUEST;
478 report->slave_address = slave_address << 1;
479 report->length = data_length + 1;
480 report->data[0] = command;
481 memcpy(&report->data[1], data, data_length);
482 return data_length + 4;
483 }
484
485 static int cp2112_i2c_write_req(void *buf, u8 slave_address, u8 *data,
486 u8 data_length)
487 {
488 struct cp2112_write_req_report *report = buf;
489
490 if (data_length > sizeof(report->data))
491 return -EINVAL;
492
493 report->report = CP2112_DATA_WRITE_REQUEST;
494 report->slave_address = slave_address << 1;
495 report->length = data_length;
496 memcpy(report->data, data, data_length);
497 return data_length + 3;
498 }
499
500 static int cp2112_i2c_write_read_req(void *buf, u8 slave_address,
501 u8 *addr, int addr_length,
502 int read_length)
503 {
504 struct cp2112_write_read_req_report *report = buf;
505
506 if (read_length < 1 || read_length > 512 ||
507 addr_length > sizeof(report->target_address))
508 return -EINVAL;
509
510 report->report = CP2112_DATA_WRITE_READ_REQUEST;
511 report->slave_address = slave_address << 1;
512 report->length = cpu_to_be16(read_length);
513 report->target_address_length = addr_length;
514 memcpy(report->target_address, addr, addr_length);
515 return addr_length + 5;
516 }
517
518 static int cp2112_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
519 int num)
520 {
521 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data;
522 struct hid_device *hdev = dev->hdev;
523 u8 buf[64];
524 ssize_t count;
525 ssize_t read_length = 0;
526 u8 *read_buf = NULL;
527 unsigned int retries;
528 int ret;
529
530 hid_dbg(hdev, "I2C %d messages\n", num);
531
532 if (num == 1) {
533 if (msgs->flags & I2C_M_RD) {
534 hid_dbg(hdev, "I2C read %#04x len %d\n",
535 msgs->addr, msgs->len);
536 read_length = msgs->len;
537 read_buf = msgs->buf;
538 count = cp2112_read_req(buf, msgs->addr, msgs->len);
539 } else {
540 hid_dbg(hdev, "I2C write %#04x len %d\n",
541 msgs->addr, msgs->len);
542 count = cp2112_i2c_write_req(buf, msgs->addr,
543 msgs->buf, msgs->len);
544 }
545 if (count < 0)
546 return count;
547 } else if (dev->hwversion > 1 && /* no repeated start in rev 1 */
548 num == 2 &&
549 msgs[0].addr == msgs[1].addr &&
550 !(msgs[0].flags & I2C_M_RD) && (msgs[1].flags & I2C_M_RD)) {
551 hid_dbg(hdev, "I2C write-read %#04x wlen %d rlen %d\n",
552 msgs[0].addr, msgs[0].len, msgs[1].len);
553 read_length = msgs[1].len;
554 read_buf = msgs[1].buf;
555 count = cp2112_i2c_write_read_req(buf, msgs[0].addr,
556 msgs[0].buf, msgs[0].len, msgs[1].len);
557 if (count < 0)
558 return count;
559 } else {
560 hid_err(hdev,
561 "Multi-message I2C transactions not supported\n");
562 return -EOPNOTSUPP;
563 }
564
565 ret = hid_hw_power(hdev, PM_HINT_FULLON);
566 if (ret < 0) {
567 hid_err(hdev, "power management error: %d\n", ret);
568 return ret;
569 }
570
571 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT);
572 if (ret < 0) {
573 hid_warn(hdev, "Error starting transaction: %d\n", ret);
574 goto power_normal;
575 }
576
577 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) {
578 ret = cp2112_xfer_status(dev);
579 if (-EBUSY == ret)
580 continue;
581 if (ret < 0)
582 goto power_normal;
583 break;
584 }
585
586 if (XFER_STATUS_RETRIES <= retries) {
587 hid_warn(hdev, "Transfer timed out, cancelling.\n");
588 buf[0] = CP2112_CANCEL_TRANSFER;
589 buf[1] = 0x01;
590
591 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT);
592 if (ret < 0)
593 hid_warn(hdev, "Error cancelling transaction: %d\n",
594 ret);
595
596 ret = -ETIMEDOUT;
597 goto power_normal;
598 }
599
600 for (count = 0; count < read_length;) {
601 ret = cp2112_read(dev, read_buf + count, read_length - count);
602 if (ret < 0)
603 goto power_normal;
604 if (ret == 0) {
605 hid_err(hdev, "read returned 0\n");
606 ret = -EIO;
607 goto power_normal;
608 }
609 count += ret;
610 if (count > read_length) {
611 /*
612 * The hardware returned too much data.
613 * This is mostly harmless because cp2112_read()
614 * has a limit check so didn't overrun our
615 * buffer. Nevertheless, we return an error
616 * because something is seriously wrong and
617 * it shouldn't go unnoticed.
618 */
619 hid_err(hdev, "long read: %d > %zd\n",
620 ret, read_length - count + ret);
621 ret = -EIO;
622 goto power_normal;
623 }
624 }
625
626 /* return the number of transferred messages */
627 ret = num;
628
629 power_normal:
630 hid_hw_power(hdev, PM_HINT_NORMAL);
631 hid_dbg(hdev, "I2C transfer finished: %d\n", ret);
632 return ret;
633 }
634
635 static int cp2112_xfer(struct i2c_adapter *adap, u16 addr,
636 unsigned short flags, char read_write, u8 command,
637 int size, union i2c_smbus_data *data)
638 {
639 struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data;
640 struct hid_device *hdev = dev->hdev;
641 u8 buf[64];
642 __le16 word;
643 ssize_t count;
644 size_t read_length = 0;
645 unsigned int retries;
646 int ret;
647
648 hid_dbg(hdev, "%s addr 0x%x flags 0x%x cmd 0x%x size %d\n",
649 read_write == I2C_SMBUS_WRITE ? "write" : "read",
650 addr, flags, command, size);
651
652 switch (size) {
653 case I2C_SMBUS_BYTE:
654 read_length = 1;
655
656 if (I2C_SMBUS_READ == read_write)
657 count = cp2112_read_req(buf, addr, read_length);
658 else
659 count = cp2112_write_req(buf, addr, command, NULL,
660 0);
661 break;
662 case I2C_SMBUS_BYTE_DATA:
663 read_length = 1;
664
665 if (I2C_SMBUS_READ == read_write)
666 count = cp2112_write_read_req(buf, addr, read_length,
667 command, NULL, 0);
668 else
669 count = cp2112_write_req(buf, addr, command,
670 &data->byte, 1);
671 break;
672 case I2C_SMBUS_WORD_DATA:
673 read_length = 2;
674 word = cpu_to_le16(data->word);
675
676 if (I2C_SMBUS_READ == read_write)
677 count = cp2112_write_read_req(buf, addr, read_length,
678 command, NULL, 0);
679 else
680 count = cp2112_write_req(buf, addr, command,
681 (u8 *)&word, 2);
682 break;
683 case I2C_SMBUS_PROC_CALL:
684 size = I2C_SMBUS_WORD_DATA;
685 read_write = I2C_SMBUS_READ;
686 read_length = 2;
687 word = cpu_to_le16(data->word);
688
689 count = cp2112_write_read_req(buf, addr, read_length, command,
690 (u8 *)&word, 2);
691 break;
692 case I2C_SMBUS_I2C_BLOCK_DATA:
693 if (read_write == I2C_SMBUS_READ) {
694 read_length = data->block[0];
695 count = cp2112_write_read_req(buf, addr, read_length,
696 command, NULL, 0);
697 } else {
698 count = cp2112_write_req(buf, addr, command,
699 data->block + 1,
700 data->block[0]);
701 }
702 break;
703 case I2C_SMBUS_BLOCK_DATA:
704 if (I2C_SMBUS_READ == read_write) {
705 count = cp2112_write_read_req(buf, addr,
706 I2C_SMBUS_BLOCK_MAX,
707 command, NULL, 0);
708 } else {
709 count = cp2112_write_req(buf, addr, command,
710 data->block,
711 data->block[0] + 1);
712 }
713 break;
714 case I2C_SMBUS_BLOCK_PROC_CALL:
715 size = I2C_SMBUS_BLOCK_DATA;
716 read_write = I2C_SMBUS_READ;
717
718 count = cp2112_write_read_req(buf, addr, I2C_SMBUS_BLOCK_MAX,
719 command, data->block,
720 data->block[0] + 1);
721 break;
722 default:
723 hid_warn(hdev, "Unsupported transaction %d\n", size);
724 return -EOPNOTSUPP;
725 }
726
727 if (count < 0)
728 return count;
729
730 ret = hid_hw_power(hdev, PM_HINT_FULLON);
731 if (ret < 0) {
732 hid_err(hdev, "power management error: %d\n", ret);
733 return ret;
734 }
735
736 ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT);
737 if (ret < 0) {
738 hid_warn(hdev, "Error starting transaction: %d\n", ret);
739 goto power_normal;
740 }
741
742 for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) {
743 ret = cp2112_xfer_status(dev);
744 if (-EBUSY == ret)
745 continue;
746 if (ret < 0)
747 goto power_normal;
748 break;
749 }
750
751 if (XFER_STATUS_RETRIES <= retries) {
752 hid_warn(hdev, "Transfer timed out, cancelling.\n");
753 buf[0] = CP2112_CANCEL_TRANSFER;
754 buf[1] = 0x01;
755
756 ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT);
757 if (ret < 0)
758 hid_warn(hdev, "Error cancelling transaction: %d\n",
759 ret);
760
761 ret = -ETIMEDOUT;
762 goto power_normal;
763 }
764
765 if (I2C_SMBUS_WRITE == read_write) {
766 ret = 0;
767 goto power_normal;
768 }
769
770 if (I2C_SMBUS_BLOCK_DATA == size)
771 read_length = ret;
772
773 ret = cp2112_read(dev, buf, read_length);
774 if (ret < 0)
775 goto power_normal;
776 if (ret != read_length) {
777 hid_warn(hdev, "short read: %d < %zd\n", ret, read_length);
778 ret = -EIO;
779 goto power_normal;
780 }
781
782 switch (size) {
783 case I2C_SMBUS_BYTE:
784 case I2C_SMBUS_BYTE_DATA:
785 data->byte = buf[0];
786 break;
787 case I2C_SMBUS_WORD_DATA:
788 data->word = le16_to_cpup((__le16 *)buf);
789 break;
790 case I2C_SMBUS_I2C_BLOCK_DATA:
791 memcpy(data->block + 1, buf, read_length);
792 break;
793 case I2C_SMBUS_BLOCK_DATA:
794 if (read_length > I2C_SMBUS_BLOCK_MAX) {
795 ret = -EPROTO;
796 goto power_normal;
797 }
798
799 memcpy(data->block, buf, read_length);
800 break;
801 }
802
803 ret = 0;
804 power_normal:
805 hid_hw_power(hdev, PM_HINT_NORMAL);
806 hid_dbg(hdev, "transfer finished: %d\n", ret);
807 return ret;
808 }
809
810 static u32 cp2112_functionality(struct i2c_adapter *adap)
811 {
812 return I2C_FUNC_I2C |
813 I2C_FUNC_SMBUS_BYTE |
814 I2C_FUNC_SMBUS_BYTE_DATA |
815 I2C_FUNC_SMBUS_WORD_DATA |
816 I2C_FUNC_SMBUS_BLOCK_DATA |
817 I2C_FUNC_SMBUS_I2C_BLOCK |
818 I2C_FUNC_SMBUS_PROC_CALL |
819 I2C_FUNC_SMBUS_BLOCK_PROC_CALL;
820 }
821
822 static const struct i2c_algorithm smbus_algorithm = {
823 .master_xfer = cp2112_i2c_xfer,
824 .smbus_xfer = cp2112_xfer,
825 .functionality = cp2112_functionality,
826 };
827
828 static int cp2112_get_usb_config(struct hid_device *hdev,
829 struct cp2112_usb_config_report *cfg)
830 {
831 int ret;
832
833 ret = cp2112_hid_get(hdev, CP2112_USB_CONFIG, (u8 *)cfg, sizeof(*cfg),
834 HID_FEATURE_REPORT);
835 if (ret != sizeof(*cfg)) {
836 hid_err(hdev, "error reading usb config: %d\n", ret);
837 if (ret < 0)
838 return ret;
839 return -EIO;
840 }
841
842 return 0;
843 }
844
845 static int cp2112_set_usb_config(struct hid_device *hdev,
846 struct cp2112_usb_config_report *cfg)
847 {
848 int ret;
849
850 BUG_ON(cfg->report != CP2112_USB_CONFIG);
851
852 ret = cp2112_hid_output(hdev, (u8 *)cfg, sizeof(*cfg),
853 HID_FEATURE_REPORT);
854 if (ret != sizeof(*cfg)) {
855 hid_err(hdev, "error writing usb config: %d\n", ret);
856 if (ret < 0)
857 return ret;
858 return -EIO;
859 }
860
861 return 0;
862 }
863
864 static void chmod_sysfs_attrs(struct hid_device *hdev);
865
866 #define CP2112_CONFIG_ATTR(name, store, format, ...) \
867 static ssize_t name##_store(struct device *kdev, \
868 struct device_attribute *attr, const char *buf, \
869 size_t count) \
870 { \
871 struct hid_device *hdev = to_hid_device(kdev); \
872 struct cp2112_usb_config_report cfg; \
873 int ret = cp2112_get_usb_config(hdev, &cfg); \
874 if (ret) \
875 return ret; \
876 store; \
877 ret = cp2112_set_usb_config(hdev, &cfg); \
878 if (ret) \
879 return ret; \
880 chmod_sysfs_attrs(hdev); \
881 return count; \
882 } \
883 static ssize_t name##_show(struct device *kdev, \
884 struct device_attribute *attr, char *buf) \
885 { \
886 struct hid_device *hdev = to_hid_device(kdev); \
887 struct cp2112_usb_config_report cfg; \
888 int ret = cp2112_get_usb_config(hdev, &cfg); \
889 if (ret) \
890 return ret; \
891 return scnprintf(buf, PAGE_SIZE, format, ##__VA_ARGS__); \
892 } \
893 static DEVICE_ATTR_RW(name);
894
895 CP2112_CONFIG_ATTR(vendor_id, ({
896 u16 vid;
897
898 if (sscanf(buf, "%hi", &vid) != 1)
899 return -EINVAL;
900
901 cfg.vid = cpu_to_le16(vid);
902 cfg.mask = 0x01;
903 }), "0x%04x\n", le16_to_cpu(cfg.vid));
904
905 CP2112_CONFIG_ATTR(product_id, ({
906 u16 pid;
907
908 if (sscanf(buf, "%hi", &pid) != 1)
909 return -EINVAL;
910
911 cfg.pid = cpu_to_le16(pid);
912 cfg.mask = 0x02;
913 }), "0x%04x\n", le16_to_cpu(cfg.pid));
914
915 CP2112_CONFIG_ATTR(max_power, ({
916 int mA;
917
918 if (sscanf(buf, "%i", &mA) != 1)
919 return -EINVAL;
920
921 cfg.max_power = (mA + 1) / 2;
922 cfg.mask = 0x04;
923 }), "%u mA\n", cfg.max_power * 2);
924
925 CP2112_CONFIG_ATTR(power_mode, ({
926 if (sscanf(buf, "%hhi", &cfg.power_mode) != 1)
927 return -EINVAL;
928
929 cfg.mask = 0x08;
930 }), "%u\n", cfg.power_mode);
931
932 CP2112_CONFIG_ATTR(release_version, ({
933 if (sscanf(buf, "%hhi.%hhi", &cfg.release_major, &cfg.release_minor)
934 != 2)
935 return -EINVAL;
936
937 cfg.mask = 0x10;
938 }), "%u.%u\n", cfg.release_major, cfg.release_minor);
939
940 #undef CP2112_CONFIG_ATTR
941
942 struct cp2112_pstring_attribute {
943 struct device_attribute attr;
944 unsigned char report;
945 };
946
947 static ssize_t pstr_store(struct device *kdev,
948 struct device_attribute *kattr, const char *buf,
949 size_t count)
950 {
951 struct hid_device *hdev = to_hid_device(kdev);
952 struct cp2112_pstring_attribute *attr =
953 container_of(kattr, struct cp2112_pstring_attribute, attr);
954 struct cp2112_string_report report;
955 int ret;
956
957 memset(&report, 0, sizeof(report));
958
959 ret = utf8s_to_utf16s(buf, count, UTF16_LITTLE_ENDIAN,
960 report.string, ARRAY_SIZE(report.string));
961 report.report = attr->report;
962 report.length = ret * sizeof(report.string[0]) + 2;
963 report.type = USB_DT_STRING;
964
965 ret = cp2112_hid_output(hdev, &report.report, report.length + 1,
966 HID_FEATURE_REPORT);
967 if (ret != report.length + 1) {
968 hid_err(hdev, "error writing %s string: %d\n", kattr->attr.name,
969 ret);
970 if (ret < 0)
971 return ret;
972 return -EIO;
973 }
974
975 chmod_sysfs_attrs(hdev);
976 return count;
977 }
978
979 static ssize_t pstr_show(struct device *kdev,
980 struct device_attribute *kattr, char *buf)
981 {
982 struct hid_device *hdev = to_hid_device(kdev);
983 struct cp2112_pstring_attribute *attr =
984 container_of(kattr, struct cp2112_pstring_attribute, attr);
985 struct cp2112_string_report report;
986 u8 length;
987 int ret;
988
989 ret = cp2112_hid_get(hdev, attr->report, &report.report,
990 sizeof(report) - 1, HID_FEATURE_REPORT);
991 if (ret < 3) {
992 hid_err(hdev, "error reading %s string: %d\n", kattr->attr.name,
993 ret);
994 if (ret < 0)
995 return ret;
996 return -EIO;
997 }
998
999 if (report.length < 2) {
1000 hid_err(hdev, "invalid %s string length: %d\n",
1001 kattr->attr.name, report.length);
1002 return -EIO;
1003 }
1004
1005 length = report.length > ret - 1 ? ret - 1 : report.length;
1006 length = (length - 2) / sizeof(report.string[0]);
1007 ret = utf16s_to_utf8s(report.string, length, UTF16_LITTLE_ENDIAN, buf,
1008 PAGE_SIZE - 1);
1009 buf[ret++] = '\n';
1010 return ret;
1011 }
1012
1013 #define CP2112_PSTR_ATTR(name, _report) \
1014 static struct cp2112_pstring_attribute dev_attr_##name = { \
1015 .attr = __ATTR(name, (S_IWUSR | S_IRUGO), pstr_show, pstr_store), \
1016 .report = _report, \
1017 };
1018
1019 CP2112_PSTR_ATTR(manufacturer, CP2112_MANUFACTURER_STRING);
1020 CP2112_PSTR_ATTR(product, CP2112_PRODUCT_STRING);
1021 CP2112_PSTR_ATTR(serial, CP2112_SERIAL_STRING);
1022
1023 #undef CP2112_PSTR_ATTR
1024
1025 static const struct attribute_group cp2112_attr_group = {
1026 .attrs = (struct attribute *[]){
1027 &dev_attr_vendor_id.attr,
1028 &dev_attr_product_id.attr,
1029 &dev_attr_max_power.attr,
1030 &dev_attr_power_mode.attr,
1031 &dev_attr_release_version.attr,
1032 &dev_attr_manufacturer.attr.attr,
1033 &dev_attr_product.attr.attr,
1034 &dev_attr_serial.attr.attr,
1035 NULL
1036 }
1037 };
1038
1039 /* Chmoding our sysfs attributes is simply a way to expose which fields in the
1040 * PROM have already been programmed. We do not depend on this preventing
1041 * writing to these attributes since the CP2112 will simply ignore writes to
1042 * already-programmed fields. This is why there is no sense in fixing this
1043 * racy behaviour.
1044 */
1045 static void chmod_sysfs_attrs(struct hid_device *hdev)
1046 {
1047 struct attribute **attr;
1048 u8 buf[2];
1049 int ret;
1050
1051 ret = cp2112_hid_get(hdev, CP2112_LOCK_BYTE, buf, sizeof(buf),
1052 HID_FEATURE_REPORT);
1053 if (ret != sizeof(buf)) {
1054 hid_err(hdev, "error reading lock byte: %d\n", ret);
1055 return;
1056 }
1057
1058 for (attr = cp2112_attr_group.attrs; *attr; ++attr) {
1059 umode_t mode = (buf[1] & 1) ? S_IWUSR | S_IRUGO : S_IRUGO;
1060 ret = sysfs_chmod_file(&hdev->dev.kobj, *attr, mode);
1061 if (ret < 0)
1062 hid_err(hdev, "error chmoding sysfs file %s\n",
1063 (*attr)->name);
1064 buf[1] >>= 1;
1065 }
1066 }
1067
1068 static void cp2112_gpio_irq_ack(struct irq_data *d)
1069 {
1070 }
1071
1072 static void cp2112_gpio_irq_mask(struct irq_data *d)
1073 {
1074 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1075 struct cp2112_device *dev = gpiochip_get_data(gc);
1076
1077 __clear_bit(d->hwirq, &dev->irq_mask);
1078 }
1079
1080 static void cp2112_gpio_irq_unmask(struct irq_data *d)
1081 {
1082 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1083 struct cp2112_device *dev = gpiochip_get_data(gc);
1084
1085 __set_bit(d->hwirq, &dev->irq_mask);
1086 }
1087
1088 static void cp2112_gpio_poll_callback(struct work_struct *work)
1089 {
1090 struct cp2112_device *dev = container_of(work, struct cp2112_device,
1091 gpio_poll_worker.work);
1092 struct irq_data *d;
1093 u8 gpio_mask;
1094 u8 virqs = (u8)dev->irq_mask;
1095 u32 irq_type;
1096 int irq, virq, ret;
1097
1098 ret = cp2112_gpio_get_all(&dev->gc);
1099 if (ret == -ENODEV) /* the hardware has been disconnected */
1100 return;
1101 if (ret < 0)
1102 goto exit;
1103
1104 gpio_mask = ret;
1105
1106 while (virqs) {
1107 virq = ffs(virqs) - 1;
1108 virqs &= ~BIT(virq);
1109
1110 if (!dev->gc.to_irq)
1111 break;
1112
1113 irq = dev->gc.to_irq(&dev->gc, virq);
1114
1115 d = irq_get_irq_data(irq);
1116 if (!d)
1117 continue;
1118
1119 irq_type = irqd_get_trigger_type(d);
1120
1121 if (gpio_mask & BIT(virq)) {
1122 /* Level High */
1123
1124 if (irq_type & IRQ_TYPE_LEVEL_HIGH)
1125 handle_nested_irq(irq);
1126
1127 if ((irq_type & IRQ_TYPE_EDGE_RISING) &&
1128 !(dev->gpio_prev_state & BIT(virq)))
1129 handle_nested_irq(irq);
1130 } else {
1131 /* Level Low */
1132
1133 if (irq_type & IRQ_TYPE_LEVEL_LOW)
1134 handle_nested_irq(irq);
1135
1136 if ((irq_type & IRQ_TYPE_EDGE_FALLING) &&
1137 (dev->gpio_prev_state & BIT(virq)))
1138 handle_nested_irq(irq);
1139 }
1140 }
1141
1142 dev->gpio_prev_state = gpio_mask;
1143
1144 exit:
1145 if (dev->gpio_poll)
1146 schedule_delayed_work(&dev->gpio_poll_worker, 10);
1147 }
1148
1149
1150 static unsigned int cp2112_gpio_irq_startup(struct irq_data *d)
1151 {
1152 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1153 struct cp2112_device *dev = gpiochip_get_data(gc);
1154
1155 INIT_DELAYED_WORK(&dev->gpio_poll_worker, cp2112_gpio_poll_callback);
1156
1157 if (!dev->gpio_poll) {
1158 dev->gpio_poll = true;
1159 schedule_delayed_work(&dev->gpio_poll_worker, 0);
1160 }
1161
1162 cp2112_gpio_irq_unmask(d);
1163 return 0;
1164 }
1165
1166 static void cp2112_gpio_irq_shutdown(struct irq_data *d)
1167 {
1168 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
1169 struct cp2112_device *dev = gpiochip_get_data(gc);
1170
1171 cancel_delayed_work_sync(&dev->gpio_poll_worker);
1172 }
1173
1174 static int cp2112_gpio_irq_type(struct irq_data *d, unsigned int type)
1175 {
1176 return 0;
1177 }
1178
1179 static int __maybe_unused cp2112_allocate_irq(struct cp2112_device *dev,
1180 int pin)
1181 {
1182 int ret;
1183
1184 if (dev->desc[pin])
1185 return -EINVAL;
1186
1187 dev->desc[pin] = gpiochip_request_own_desc(&dev->gc, pin,
1188 "HID/I2C:Event",
1189 GPIO_ACTIVE_HIGH,
1190 GPIOD_IN);
1191 if (IS_ERR(dev->desc[pin])) {
1192 dev_err(dev->gc.parent, "Failed to request GPIO\n");
1193 return PTR_ERR(dev->desc[pin]);
1194 }
1195
1196 ret = cp2112_gpio_direction_input(&dev->gc, pin);
1197 if (ret < 0) {
1198 dev_err(dev->gc.parent, "Failed to set GPIO to input dir\n");
1199 goto err_desc;
1200 }
1201
1202 ret = gpiochip_lock_as_irq(&dev->gc, pin);
1203 if (ret) {
1204 dev_err(dev->gc.parent, "Failed to lock GPIO as interrupt\n");
1205 goto err_desc;
1206 }
1207
1208 ret = gpiod_to_irq(dev->desc[pin]);
1209 if (ret < 0) {
1210 dev_err(dev->gc.parent, "Failed to translate GPIO to IRQ\n");
1211 goto err_lock;
1212 }
1213
1214 return ret;
1215
1216 err_lock:
1217 gpiochip_unlock_as_irq(&dev->gc, pin);
1218 err_desc:
1219 gpiochip_free_own_desc(dev->desc[pin]);
1220 dev->desc[pin] = NULL;
1221 return ret;
1222 }
1223
1224 static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)
1225 {
1226 struct cp2112_device *dev;
1227 u8 buf[3];
1228 struct cp2112_smbus_config_report config;
1229 struct gpio_irq_chip *girq;
1230 int ret;
1231
1232 dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL);
1233 if (!dev)
1234 return -ENOMEM;
1235
1236 dev->in_out_buffer = devm_kzalloc(&hdev->dev, CP2112_REPORT_MAX_LENGTH,
1237 GFP_KERNEL);
1238 if (!dev->in_out_buffer)
1239 return -ENOMEM;
1240
1241 mutex_init(&dev->lock);
1242
1243 ret = hid_parse(hdev);
1244 if (ret) {
1245 hid_err(hdev, "parse failed\n");
1246 return ret;
1247 }
1248
1249 ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
1250 if (ret) {
1251 hid_err(hdev, "hw start failed\n");
1252 return ret;
1253 }
1254
1255 ret = hid_hw_open(hdev);
1256 if (ret) {
1257 hid_err(hdev, "hw open failed\n");
1258 goto err_hid_stop;
1259 }
1260
1261 ret = hid_hw_power(hdev, PM_HINT_FULLON);
1262 if (ret < 0) {
1263 hid_err(hdev, "power management error: %d\n", ret);
1264 goto err_hid_close;
1265 }
1266
1267 ret = cp2112_hid_get(hdev, CP2112_GET_VERSION_INFO, buf, sizeof(buf),
1268 HID_FEATURE_REPORT);
1269 if (ret != sizeof(buf)) {
1270 hid_err(hdev, "error requesting version\n");
1271 if (ret >= 0)
1272 ret = -EIO;
1273 goto err_power_normal;
1274 }
1275
1276 hid_info(hdev, "Part Number: 0x%02X Device Version: 0x%02X\n",
1277 buf[1], buf[2]);
1278
1279 ret = cp2112_hid_get(hdev, CP2112_SMBUS_CONFIG, (u8 *)&config,
1280 sizeof(config), HID_FEATURE_REPORT);
1281 if (ret != sizeof(config)) {
1282 hid_err(hdev, "error requesting SMBus config\n");
1283 if (ret >= 0)
1284 ret = -EIO;
1285 goto err_power_normal;
1286 }
1287
1288 config.retry_time = cpu_to_be16(1);
1289
1290 ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config),
1291 HID_FEATURE_REPORT);
1292 if (ret != sizeof(config)) {
1293 hid_err(hdev, "error setting SMBus config\n");
1294 if (ret >= 0)
1295 ret = -EIO;
1296 goto err_power_normal;
1297 }
1298
1299 hid_set_drvdata(hdev, (void *)dev);
1300 dev->hdev = hdev;
1301 dev->adap.owner = THIS_MODULE;
1302 dev->adap.class = I2C_CLASS_HWMON;
1303 dev->adap.algo = &smbus_algorithm;
1304 dev->adap.algo_data = dev;
1305 dev->adap.dev.parent = &hdev->dev;
1306 snprintf(dev->adap.name, sizeof(dev->adap.name),
1307 "CP2112 SMBus Bridge on hidraw%d",
1308 ((struct hidraw *)hdev->hidraw)->minor);
1309 dev->hwversion = buf[2];
1310 init_waitqueue_head(&dev->wait);
1311
1312 hid_device_io_start(hdev);
1313 ret = i2c_add_adapter(&dev->adap);
1314 hid_device_io_stop(hdev);
1315
1316 if (ret) {
1317 hid_err(hdev, "error registering i2c adapter\n");
1318 goto err_power_normal;
1319 }
1320
1321 hid_dbg(hdev, "adapter registered\n");
1322
1323 dev->gc.label = "cp2112_gpio";
1324 dev->gc.direction_input = cp2112_gpio_direction_input;
1325 dev->gc.direction_output = cp2112_gpio_direction_output;
1326 dev->gc.set = cp2112_gpio_set;
1327 dev->gc.get = cp2112_gpio_get;
1328 dev->gc.base = -1;
1329 dev->gc.ngpio = 8;
1330 dev->gc.can_sleep = 1;
1331 dev->gc.parent = &hdev->dev;
1332
1333 dev->irq.name = "cp2112-gpio";
1334 dev->irq.irq_startup = cp2112_gpio_irq_startup;
1335 dev->irq.irq_shutdown = cp2112_gpio_irq_shutdown;
1336 dev->irq.irq_ack = cp2112_gpio_irq_ack;
1337 dev->irq.irq_mask = cp2112_gpio_irq_mask;
1338 dev->irq.irq_unmask = cp2112_gpio_irq_unmask;
1339 dev->irq.irq_set_type = cp2112_gpio_irq_type;
1340 dev->irq.flags = IRQCHIP_MASK_ON_SUSPEND;
1341
1342 girq = &dev->gc.irq;
1343 girq->chip = &dev->irq;
1344 /* The event comes from the outside so no parent handler */
1345 girq->parent_handler = NULL;
1346 girq->num_parents = 0;
1347 girq->parents = NULL;
1348 girq->default_type = IRQ_TYPE_NONE;
1349 girq->handler = handle_simple_irq;
1350
1351 ret = gpiochip_add_data(&dev->gc, dev);
1352 if (ret < 0) {
1353 hid_err(hdev, "error registering gpio chip\n");
1354 goto err_free_i2c;
1355 }
1356
1357 ret = sysfs_create_group(&hdev->dev.kobj, &cp2112_attr_group);
1358 if (ret < 0) {
1359 hid_err(hdev, "error creating sysfs attrs\n");
1360 goto err_gpiochip_remove;
1361 }
1362
1363 chmod_sysfs_attrs(hdev);
1364 hid_hw_power(hdev, PM_HINT_NORMAL);
1365
1366 return ret;
1367
1368 err_gpiochip_remove:
1369 gpiochip_remove(&dev->gc);
1370 err_free_i2c:
1371 i2c_del_adapter(&dev->adap);
1372 err_power_normal:
1373 hid_hw_power(hdev, PM_HINT_NORMAL);
1374 err_hid_close:
1375 hid_hw_close(hdev);
1376 err_hid_stop:
1377 hid_hw_stop(hdev);
1378 return ret;
1379 }
1380
1381 static void cp2112_remove(struct hid_device *hdev)
1382 {
1383 struct cp2112_device *dev = hid_get_drvdata(hdev);
1384 int i;
1385
1386 sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group);
1387 i2c_del_adapter(&dev->adap);
1388
1389 if (dev->gpio_poll) {
1390 dev->gpio_poll = false;
1391 cancel_delayed_work_sync(&dev->gpio_poll_worker);
1392 }
1393
1394 for (i = 0; i < ARRAY_SIZE(dev->desc); i++) {
1395 gpiochip_unlock_as_irq(&dev->gc, i);
1396 gpiochip_free_own_desc(dev->desc[i]);
1397 }
1398
1399 gpiochip_remove(&dev->gc);
1400 /* i2c_del_adapter has finished removing all i2c devices from our
1401 * adapter. Well behaved devices should no longer call our cp2112_xfer
1402 * and should have waited for any pending calls to finish. It has also
1403 * waited for device_unregister(&adap->dev) to complete. Therefore we
1404 * can safely free our struct cp2112_device.
1405 */
1406 hid_hw_close(hdev);
1407 hid_hw_stop(hdev);
1408 }
1409
1410 static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report,
1411 u8 *data, int size)
1412 {
1413 struct cp2112_device *dev = hid_get_drvdata(hdev);
1414 struct cp2112_xfer_status_report *xfer = (void *)data;
1415
1416 switch (data[0]) {
1417 case CP2112_TRANSFER_STATUS_RESPONSE:
1418 hid_dbg(hdev, "xfer status: %02x %02x %04x %04x\n",
1419 xfer->status0, xfer->status1,
1420 be16_to_cpu(xfer->retries), be16_to_cpu(xfer->length));
1421
1422 switch (xfer->status0) {
1423 case STATUS0_IDLE:
1424 dev->xfer_status = -EAGAIN;
1425 break;
1426 case STATUS0_BUSY:
1427 dev->xfer_status = -EBUSY;
1428 break;
1429 case STATUS0_COMPLETE:
1430 dev->xfer_status = be16_to_cpu(xfer->length);
1431 break;
1432 case STATUS0_ERROR:
1433 switch (xfer->status1) {
1434 case STATUS1_TIMEOUT_NACK:
1435 case STATUS1_TIMEOUT_BUS:
1436 dev->xfer_status = -ETIMEDOUT;
1437 break;
1438 default:
1439 dev->xfer_status = -EIO;
1440 break;
1441 }
1442 break;
1443 default:
1444 dev->xfer_status = -EINVAL;
1445 break;
1446 }
1447
1448 atomic_set(&dev->xfer_avail, 1);
1449 break;
1450 case CP2112_DATA_READ_RESPONSE:
1451 hid_dbg(hdev, "read response: %02x %02x\n", data[1], data[2]);
1452
1453 dev->read_length = data[2];
1454 if (dev->read_length > sizeof(dev->read_data))
1455 dev->read_length = sizeof(dev->read_data);
1456
1457 memcpy(dev->read_data, &data[3], dev->read_length);
1458 atomic_set(&dev->read_avail, 1);
1459 break;
1460 default:
1461 hid_err(hdev, "unknown report\n");
1462
1463 return 0;
1464 }
1465
1466 wake_up_interruptible(&dev->wait);
1467 return 1;
1468 }
1469
1470 static struct hid_driver cp2112_driver = {
1471 .name = "cp2112",
1472 .id_table = cp2112_devices,
1473 .probe = cp2112_probe,
1474 .remove = cp2112_remove,
1475 .raw_event = cp2112_raw_event,
1476 };
1477
1478 module_hid_driver(cp2112_driver);
1479 MODULE_DESCRIPTION("Silicon Labs HID USB to SMBus master bridge");
1480 MODULE_AUTHOR("David Barksdale <dbarksdale@uplogix.com>");
1481 MODULE_LICENSE("GPL");
1482
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