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