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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/hid.h> | |
29 | #include <linux/i2c.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/nls.h> | |
32 | #include <linux/usb/ch9.h> | |
33 | #include "hid-ids.h" | |
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 | int xfer_status; | |
160 | atomic_t read_avail; | |
161 | atomic_t xfer_avail; | |
162 | struct gpio_chip gc; | |
163 | }; | |
164 | ||
165 | static int gpio_push_pull = 0xFF; | |
166 | module_param(gpio_push_pull, int, S_IRUGO | S_IWUSR); | |
167 | MODULE_PARM_DESC(gpio_push_pull, "GPIO push-pull configuration bitmask"); | |
168 | ||
169 | static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset) | |
170 | { | |
171 | struct cp2112_device *dev = container_of(chip, struct cp2112_device, | |
172 | gc); | |
173 | struct hid_device *hdev = dev->hdev; | |
174 | u8 buf[5]; | |
175 | int ret; | |
176 | ||
177 | ret = hdev->hid_get_raw_report(hdev, CP2112_GPIO_CONFIG, buf, | |
178 | sizeof(buf), HID_FEATURE_REPORT); | |
179 | if (ret != sizeof(buf)) { | |
180 | hid_err(hdev, "error requesting GPIO config: %d\n", ret); | |
181 | return ret; | |
182 | } | |
183 | ||
184 | buf[1] &= ~(1 << offset); | |
185 | buf[2] = gpio_push_pull; | |
186 | ||
187 | ret = hdev->hid_output_raw_report(hdev, buf, sizeof(buf), | |
188 | HID_FEATURE_REPORT); | |
189 | if (ret < 0) { | |
190 | hid_err(hdev, "error setting GPIO config: %d\n", ret); | |
191 | return ret; | |
192 | } | |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
197 | static void cp2112_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
198 | { | |
199 | struct cp2112_device *dev = container_of(chip, struct cp2112_device, | |
200 | gc); | |
201 | struct hid_device *hdev = dev->hdev; | |
202 | u8 buf[3]; | |
203 | int ret; | |
204 | ||
205 | buf[0] = CP2112_GPIO_SET; | |
206 | buf[1] = value ? 0xff : 0; | |
207 | buf[2] = 1 << offset; | |
208 | ||
209 | ret = hdev->hid_output_raw_report(hdev, buf, sizeof(buf), | |
210 | HID_FEATURE_REPORT); | |
211 | if (ret < 0) | |
212 | hid_err(hdev, "error setting GPIO values: %d\n", ret); | |
213 | } | |
214 | ||
215 | static int cp2112_gpio_get(struct gpio_chip *chip, unsigned offset) | |
216 | { | |
217 | struct cp2112_device *dev = container_of(chip, struct cp2112_device, | |
218 | gc); | |
219 | struct hid_device *hdev = dev->hdev; | |
220 | u8 buf[2]; | |
221 | int ret; | |
222 | ||
223 | ret = hdev->hid_get_raw_report(hdev, CP2112_GPIO_GET, buf, sizeof(buf), | |
224 | HID_FEATURE_REPORT); | |
225 | if (ret != sizeof(buf)) { | |
226 | hid_err(hdev, "error requesting GPIO values: %d\n", ret); | |
227 | return ret; | |
228 | } | |
229 | ||
230 | return (buf[1] >> offset) & 1; | |
231 | } | |
232 | ||
233 | static int cp2112_gpio_direction_output(struct gpio_chip *chip, | |
234 | unsigned offset, int value) | |
235 | { | |
236 | struct cp2112_device *dev = container_of(chip, struct cp2112_device, | |
237 | gc); | |
238 | struct hid_device *hdev = dev->hdev; | |
239 | u8 buf[5]; | |
240 | int ret; | |
241 | ||
242 | cp2112_gpio_set(chip, offset, value); | |
243 | ||
244 | ret = hdev->hid_get_raw_report(hdev, CP2112_GPIO_CONFIG, buf, | |
245 | sizeof(buf), HID_FEATURE_REPORT); | |
246 | if (ret != sizeof(buf)) { | |
247 | hid_err(hdev, "error requesting GPIO config: %d\n", ret); | |
248 | return ret; | |
249 | } | |
250 | ||
251 | buf[1] |= 1 << offset; | |
252 | buf[2] = gpio_push_pull; | |
253 | ||
254 | ret = hdev->hid_output_raw_report(hdev, buf, sizeof(buf), | |
255 | HID_FEATURE_REPORT); | |
256 | if (ret < 0) { | |
257 | hid_err(hdev, "error setting GPIO config: %d\n", ret); | |
258 | return ret; | |
259 | } | |
260 | ||
261 | return 0; | |
262 | } | |
263 | ||
264 | static int cp2112_hid_get(struct hid_device *hdev, unsigned char report_number, | |
265 | u8 *data, size_t count, unsigned char report_type) | |
266 | { | |
267 | u8 *buf; | |
268 | int ret; | |
269 | ||
270 | buf = kmalloc(count, GFP_KERNEL); | |
271 | if (!buf) | |
272 | return -ENOMEM; | |
273 | ||
274 | ret = hdev->hid_get_raw_report(hdev, report_number, buf, count, | |
275 | report_type); | |
276 | memcpy(data, buf, count); | |
277 | kfree(buf); | |
278 | return ret; | |
279 | } | |
280 | ||
281 | static int cp2112_hid_output(struct hid_device *hdev, u8 *data, size_t count, | |
282 | unsigned char report_type) | |
283 | { | |
284 | u8 *buf; | |
285 | int ret; | |
286 | ||
287 | buf = kmemdup(data, count, GFP_KERNEL); | |
288 | if (!buf) | |
289 | return -ENOMEM; | |
290 | ||
291 | ret = hdev->hid_output_raw_report(hdev, buf, count, report_type); | |
292 | kfree(buf); | |
293 | return ret; | |
294 | } | |
295 | ||
296 | static int cp2112_wait(struct cp2112_device *dev, atomic_t *avail) | |
297 | { | |
298 | int ret = 0; | |
299 | ||
300 | /* We have sent either a CP2112_TRANSFER_STATUS_REQUEST or a | |
301 | * CP2112_DATA_READ_FORCE_SEND and we are waiting for the response to | |
302 | * come in cp2112_raw_event or timeout. There will only be one of these | |
303 | * in flight at any one time. The timeout is extremely large and is a | |
304 | * last resort if the CP2112 has died. If we do timeout we don't expect | |
305 | * to receive the response which would cause data races, it's not like | |
306 | * we can do anything about it anyway. | |
307 | */ | |
308 | ret = wait_event_interruptible_timeout(dev->wait, | |
309 | atomic_read(avail), msecs_to_jiffies(RESPONSE_TIMEOUT)); | |
310 | if (-ERESTARTSYS == ret) | |
311 | return ret; | |
312 | if (!ret) | |
313 | return -ETIMEDOUT; | |
314 | ||
315 | atomic_set(avail, 0); | |
316 | return 0; | |
317 | } | |
318 | ||
319 | static int cp2112_xfer_status(struct cp2112_device *dev) | |
320 | { | |
321 | struct hid_device *hdev = dev->hdev; | |
322 | u8 buf[2]; | |
323 | int ret; | |
324 | ||
325 | buf[0] = CP2112_TRANSFER_STATUS_REQUEST; | |
326 | buf[1] = 0x01; | |
327 | atomic_set(&dev->xfer_avail, 0); | |
328 | ||
329 | ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); | |
330 | if (ret < 0) { | |
331 | hid_warn(hdev, "Error requesting status: %d\n", ret); | |
332 | return ret; | |
333 | } | |
334 | ||
335 | ret = cp2112_wait(dev, &dev->xfer_avail); | |
336 | if (ret) | |
337 | return ret; | |
338 | ||
339 | return dev->xfer_status; | |
340 | } | |
341 | ||
342 | static int cp2112_read(struct cp2112_device *dev, u8 *data, size_t size) | |
343 | { | |
344 | struct hid_device *hdev = dev->hdev; | |
345 | struct cp2112_force_read_report report; | |
346 | int ret; | |
347 | ||
348 | report.report = CP2112_DATA_READ_FORCE_SEND; | |
349 | report.length = cpu_to_be16(size); | |
350 | ||
351 | atomic_set(&dev->read_avail, 0); | |
352 | ||
353 | ret = cp2112_hid_output(hdev, &report.report, sizeof(report), | |
354 | HID_OUTPUT_REPORT); | |
355 | if (ret < 0) { | |
356 | hid_warn(hdev, "Error requesting data: %d\n", ret); | |
357 | return ret; | |
358 | } | |
359 | ||
360 | ret = cp2112_wait(dev, &dev->read_avail); | |
361 | if (ret) | |
362 | return ret; | |
363 | ||
364 | hid_dbg(hdev, "read %d of %d bytes requested\n", | |
365 | dev->read_length, size); | |
366 | ||
367 | if (size > dev->read_length) | |
368 | size = dev->read_length; | |
369 | ||
370 | memcpy(data, dev->read_data, size); | |
371 | return dev->read_length; | |
372 | } | |
373 | ||
374 | static int cp2112_read_req(void *buf, u8 slave_address, u16 length) | |
375 | { | |
376 | struct cp2112_read_req_report *report = buf; | |
377 | ||
378 | if (length < 1 || length > 512) | |
379 | return -EINVAL; | |
380 | ||
381 | report->report = CP2112_DATA_READ_REQUEST; | |
382 | report->slave_address = slave_address << 1; | |
383 | report->length = cpu_to_be16(length); | |
384 | return sizeof(*report); | |
385 | } | |
386 | ||
387 | static int cp2112_write_read_req(void *buf, u8 slave_address, u16 length, | |
388 | u8 command, u8 *data, u8 data_length) | |
389 | { | |
390 | struct cp2112_write_read_req_report *report = buf; | |
391 | ||
392 | if (length < 1 || length > 512 | |
393 | || data_length > sizeof(report->target_address) - 1) | |
394 | return -EINVAL; | |
395 | ||
396 | report->report = CP2112_DATA_WRITE_READ_REQUEST; | |
397 | report->slave_address = slave_address << 1; | |
398 | report->length = cpu_to_be16(length); | |
399 | report->target_address_length = data_length + 1; | |
400 | report->target_address[0] = command; | |
401 | memcpy(&report->target_address[1], data, data_length); | |
402 | return data_length + 6; | |
403 | } | |
404 | ||
405 | static int cp2112_write_req(void *buf, u8 slave_address, u8 command, u8 *data, | |
406 | u8 data_length) | |
407 | { | |
408 | struct cp2112_write_req_report *report = buf; | |
409 | ||
410 | if (data_length > sizeof(report->data) - 1) | |
411 | return -EINVAL; | |
412 | ||
413 | report->report = CP2112_DATA_WRITE_REQUEST; | |
414 | report->slave_address = slave_address << 1; | |
415 | report->length = data_length + 1; | |
416 | report->data[0] = command; | |
417 | memcpy(&report->data[1], data, data_length); | |
418 | return data_length + 4; | |
419 | } | |
420 | ||
421 | static int cp2112_xfer(struct i2c_adapter *adap, u16 addr, | |
422 | unsigned short flags, char read_write, u8 command, | |
423 | int size, union i2c_smbus_data *data) | |
424 | { | |
425 | struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; | |
426 | struct hid_device *hdev = dev->hdev; | |
427 | u8 buf[64]; | |
428 | __be16 word; | |
429 | size_t count; | |
430 | size_t read_length = 0; | |
431 | unsigned int retries; | |
432 | int ret; | |
433 | ||
434 | hid_dbg(hdev, "%s addr 0x%x flags 0x%x cmd 0x%x size %d\n", | |
435 | read_write == I2C_SMBUS_WRITE ? "write" : "read", | |
436 | addr, flags, command, size); | |
437 | ||
438 | switch (size) { | |
439 | case I2C_SMBUS_BYTE: | |
440 | read_length = 1; | |
441 | ||
442 | if (I2C_SMBUS_READ == read_write) | |
443 | count = cp2112_read_req(buf, addr, read_length); | |
444 | else | |
445 | count = cp2112_write_req(buf, addr, data->byte, NULL, | |
446 | 0); | |
447 | break; | |
448 | case I2C_SMBUS_BYTE_DATA: | |
449 | read_length = 1; | |
450 | ||
451 | if (I2C_SMBUS_READ == read_write) | |
452 | count = cp2112_write_read_req(buf, addr, read_length, | |
453 | command, NULL, 0); | |
454 | else | |
455 | count = cp2112_write_req(buf, addr, command, | |
456 | &data->byte, 1); | |
457 | break; | |
458 | case I2C_SMBUS_WORD_DATA: | |
459 | read_length = 2; | |
460 | word = cpu_to_be16(data->word); | |
461 | ||
462 | if (I2C_SMBUS_READ == read_write) | |
463 | count = cp2112_write_read_req(buf, addr, read_length, | |
464 | command, NULL, 0); | |
465 | else | |
466 | count = cp2112_write_req(buf, addr, command, | |
467 | (u8 *)&word, 2); | |
468 | break; | |
469 | case I2C_SMBUS_PROC_CALL: | |
470 | size = I2C_SMBUS_WORD_DATA; | |
471 | read_write = I2C_SMBUS_READ; | |
472 | read_length = 2; | |
473 | word = cpu_to_be16(data->word); | |
474 | ||
475 | count = cp2112_write_read_req(buf, addr, read_length, command, | |
476 | (u8 *)&word, 2); | |
477 | break; | |
478 | case I2C_SMBUS_I2C_BLOCK_DATA: | |
479 | size = I2C_SMBUS_BLOCK_DATA; | |
480 | /* fallthrough */ | |
481 | case I2C_SMBUS_BLOCK_DATA: | |
482 | if (I2C_SMBUS_READ == read_write) { | |
483 | count = cp2112_write_read_req(buf, addr, | |
484 | I2C_SMBUS_BLOCK_MAX, | |
485 | command, NULL, 0); | |
486 | } else { | |
487 | count = cp2112_write_req(buf, addr, command, | |
488 | data->block, | |
489 | data->block[0] + 1); | |
490 | } | |
491 | break; | |
492 | case I2C_SMBUS_BLOCK_PROC_CALL: | |
493 | size = I2C_SMBUS_BLOCK_DATA; | |
494 | read_write = I2C_SMBUS_READ; | |
495 | ||
496 | count = cp2112_write_read_req(buf, addr, I2C_SMBUS_BLOCK_MAX, | |
497 | command, data->block, | |
498 | data->block[0] + 1); | |
499 | break; | |
500 | default: | |
501 | hid_warn(hdev, "Unsupported transaction %d\n", size); | |
502 | return -EOPNOTSUPP; | |
503 | } | |
504 | ||
505 | if (count < 0) | |
506 | return count; | |
507 | ||
508 | ret = hid_hw_power(hdev, PM_HINT_FULLON); | |
509 | if (ret < 0) { | |
510 | hid_err(hdev, "power management error: %d\n", ret); | |
511 | return ret; | |
512 | } | |
513 | ||
514 | ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); | |
515 | if (ret < 0) { | |
516 | hid_warn(hdev, "Error starting transaction: %d\n", ret); | |
517 | goto power_normal; | |
518 | } | |
519 | ||
520 | for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { | |
521 | ret = cp2112_xfer_status(dev); | |
522 | if (-EBUSY == ret) | |
523 | continue; | |
524 | if (ret < 0) | |
525 | goto power_normal; | |
526 | break; | |
527 | } | |
528 | ||
529 | if (XFER_STATUS_RETRIES <= retries) { | |
530 | hid_warn(hdev, "Transfer timed out, cancelling.\n"); | |
531 | buf[0] = CP2112_CANCEL_TRANSFER; | |
532 | buf[1] = 0x01; | |
533 | ||
534 | ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); | |
535 | if (ret < 0) | |
536 | hid_warn(hdev, "Error cancelling transaction: %d\n", | |
537 | ret); | |
538 | ||
539 | ret = -ETIMEDOUT; | |
540 | goto power_normal; | |
541 | } | |
542 | ||
543 | if (I2C_SMBUS_WRITE == read_write) { | |
544 | ret = 0; | |
545 | goto power_normal; | |
546 | } | |
547 | ||
548 | if (I2C_SMBUS_BLOCK_DATA == size) | |
549 | read_length = ret; | |
550 | ||
551 | ret = cp2112_read(dev, buf, read_length); | |
552 | if (ret < 0) | |
553 | goto power_normal; | |
554 | if (ret != read_length) { | |
555 | hid_warn(hdev, "short read: %d < %d\n", ret, read_length); | |
556 | ret = -EIO; | |
557 | goto power_normal; | |
558 | } | |
559 | ||
560 | switch (size) { | |
561 | case I2C_SMBUS_BYTE: | |
562 | case I2C_SMBUS_BYTE_DATA: | |
563 | data->byte = buf[0]; | |
564 | break; | |
565 | case I2C_SMBUS_WORD_DATA: | |
566 | data->word = be16_to_cpup((__be16 *)buf); | |
567 | break; | |
568 | case I2C_SMBUS_BLOCK_DATA: | |
569 | if (read_length > I2C_SMBUS_BLOCK_MAX) { | |
570 | ret = -EPROTO; | |
571 | goto power_normal; | |
572 | } | |
573 | ||
574 | memcpy(data->block, buf, read_length); | |
575 | break; | |
576 | } | |
577 | ||
578 | ret = 0; | |
579 | power_normal: | |
580 | hid_hw_power(hdev, PM_HINT_NORMAL); | |
581 | hid_dbg(hdev, "transfer finished: %d\n", ret); | |
582 | return ret; | |
583 | } | |
584 | ||
585 | static u32 cp2112_functionality(struct i2c_adapter *adap) | |
586 | { | |
587 | return I2C_FUNC_SMBUS_BYTE | | |
588 | I2C_FUNC_SMBUS_BYTE_DATA | | |
589 | I2C_FUNC_SMBUS_WORD_DATA | | |
590 | I2C_FUNC_SMBUS_BLOCK_DATA | | |
591 | I2C_FUNC_SMBUS_I2C_BLOCK | | |
592 | I2C_FUNC_SMBUS_PROC_CALL | | |
593 | I2C_FUNC_SMBUS_BLOCK_PROC_CALL; | |
594 | } | |
595 | ||
596 | static const struct i2c_algorithm smbus_algorithm = { | |
597 | .smbus_xfer = cp2112_xfer, | |
598 | .functionality = cp2112_functionality, | |
599 | }; | |
600 | ||
601 | static int cp2112_get_usb_config(struct hid_device *hdev, | |
602 | struct cp2112_usb_config_report *cfg) | |
603 | { | |
604 | int ret; | |
605 | ||
606 | ret = cp2112_hid_get(hdev, CP2112_USB_CONFIG, (u8 *)cfg, sizeof(*cfg), | |
607 | HID_FEATURE_REPORT); | |
608 | if (ret != sizeof(*cfg)) { | |
609 | hid_err(hdev, "error reading usb config: %d\n", ret); | |
610 | if (ret < 0) | |
611 | return ret; | |
612 | return -EIO; | |
613 | } | |
614 | ||
615 | return 0; | |
616 | } | |
617 | ||
618 | static int cp2112_set_usb_config(struct hid_device *hdev, | |
619 | struct cp2112_usb_config_report *cfg) | |
620 | { | |
621 | int ret; | |
622 | ||
623 | BUG_ON(cfg->report != CP2112_USB_CONFIG); | |
624 | ||
625 | ret = cp2112_hid_output(hdev, (u8 *)cfg, sizeof(*cfg), | |
626 | HID_FEATURE_REPORT); | |
627 | if (ret != sizeof(*cfg)) { | |
628 | hid_err(hdev, "error writing usb config: %d\n", ret); | |
629 | if (ret < 0) | |
630 | return ret; | |
631 | return -EIO; | |
632 | } | |
633 | ||
634 | return 0; | |
635 | } | |
636 | ||
637 | static void chmod_sysfs_attrs(struct hid_device *hdev); | |
638 | ||
639 | #define CP2112_CONFIG_ATTR(name, store, format, ...) \ | |
640 | static ssize_t name##_store(struct device *kdev, \ | |
641 | struct device_attribute *attr, const char *buf, \ | |
642 | size_t count) \ | |
643 | { \ | |
644 | struct hid_device *hdev = container_of(kdev, struct hid_device, dev); \ | |
645 | struct cp2112_usb_config_report cfg; \ | |
646 | int ret = cp2112_get_usb_config(hdev, &cfg); \ | |
647 | if (ret) \ | |
648 | return ret; \ | |
649 | store; \ | |
650 | ret = cp2112_set_usb_config(hdev, &cfg); \ | |
651 | if (ret) \ | |
652 | return ret; \ | |
653 | chmod_sysfs_attrs(hdev); \ | |
654 | return count; \ | |
655 | } \ | |
656 | static ssize_t name##_show(struct device *kdev, \ | |
657 | struct device_attribute *attr, char *buf) \ | |
658 | { \ | |
659 | struct hid_device *hdev = container_of(kdev, struct hid_device, dev); \ | |
660 | struct cp2112_usb_config_report cfg; \ | |
661 | int ret = cp2112_get_usb_config(hdev, &cfg); \ | |
662 | if (ret) \ | |
663 | return ret; \ | |
664 | return scnprintf(buf, PAGE_SIZE, format, ##__VA_ARGS__); \ | |
665 | } \ | |
c3c041ba | 666 | static DEVICE_ATTR_RW(name); |
e932d817 DB |
667 | |
668 | CP2112_CONFIG_ATTR(vendor_id, ({ | |
669 | u16 vid; | |
670 | ||
671 | if (sscanf(buf, "%hi", &vid) != 1) | |
672 | return -EINVAL; | |
673 | ||
674 | cfg.vid = cpu_to_le16(vid); | |
675 | cfg.mask = 0x01; | |
676 | }), "0x%04x\n", le16_to_cpu(cfg.vid)); | |
677 | ||
678 | CP2112_CONFIG_ATTR(product_id, ({ | |
679 | u16 pid; | |
680 | ||
681 | if (sscanf(buf, "%hi", &pid) != 1) | |
682 | return -EINVAL; | |
683 | ||
684 | cfg.pid = cpu_to_le16(pid); | |
685 | cfg.mask = 0x02; | |
686 | }), "0x%04x\n", le16_to_cpu(cfg.pid)); | |
687 | ||
688 | CP2112_CONFIG_ATTR(max_power, ({ | |
689 | int mA; | |
690 | ||
691 | if (sscanf(buf, "%i", &mA) != 1) | |
692 | return -EINVAL; | |
693 | ||
694 | cfg.max_power = (mA + 1) / 2; | |
695 | cfg.mask = 0x04; | |
696 | }), "%u mA\n", cfg.max_power * 2); | |
697 | ||
698 | CP2112_CONFIG_ATTR(power_mode, ({ | |
699 | if (sscanf(buf, "%hhi", &cfg.power_mode) != 1) | |
700 | return -EINVAL; | |
701 | ||
702 | cfg.mask = 0x08; | |
703 | }), "%u\n", cfg.power_mode); | |
704 | ||
705 | CP2112_CONFIG_ATTR(release_version, ({ | |
706 | if (sscanf(buf, "%hhi.%hhi", &cfg.release_major, &cfg.release_minor) | |
707 | != 2) | |
708 | return -EINVAL; | |
709 | ||
710 | cfg.mask = 0x10; | |
711 | }), "%u.%u\n", cfg.release_major, cfg.release_minor); | |
712 | ||
713 | #undef CP2112_CONFIG_ATTR | |
714 | ||
715 | struct cp2112_pstring_attribute { | |
716 | struct device_attribute attr; | |
717 | unsigned char report; | |
718 | }; | |
719 | ||
720 | static ssize_t pstr_store(struct device *kdev, | |
721 | struct device_attribute *kattr, const char *buf, | |
722 | size_t count) | |
723 | { | |
724 | struct hid_device *hdev = container_of(kdev, struct hid_device, dev); | |
725 | struct cp2112_pstring_attribute *attr = | |
726 | container_of(kattr, struct cp2112_pstring_attribute, attr); | |
727 | struct cp2112_string_report report; | |
728 | int ret; | |
729 | ||
730 | memset(&report, 0, sizeof(report)); | |
731 | ||
732 | ret = utf8s_to_utf16s(buf, count, UTF16_LITTLE_ENDIAN, | |
733 | report.string, ARRAY_SIZE(report.string)); | |
734 | report.report = attr->report; | |
735 | report.length = ret * sizeof(report.string[0]) + 2; | |
736 | report.type = USB_DT_STRING; | |
737 | ||
738 | ret = cp2112_hid_output(hdev, &report.report, report.length + 1, | |
739 | HID_FEATURE_REPORT); | |
740 | if (ret != report.length + 1) { | |
741 | hid_err(hdev, "error writing %s string: %d\n", kattr->attr.name, | |
742 | ret); | |
743 | if (ret < 0) | |
744 | return ret; | |
745 | return -EIO; | |
746 | } | |
747 | ||
748 | chmod_sysfs_attrs(hdev); | |
749 | return count; | |
750 | } | |
751 | ||
752 | static ssize_t pstr_show(struct device *kdev, | |
753 | struct device_attribute *kattr, char *buf) | |
754 | { | |
755 | struct hid_device *hdev = container_of(kdev, struct hid_device, dev); | |
756 | struct cp2112_pstring_attribute *attr = | |
757 | container_of(kattr, struct cp2112_pstring_attribute, attr); | |
758 | struct cp2112_string_report report; | |
759 | u8 length; | |
760 | int ret; | |
761 | ||
762 | ret = cp2112_hid_get(hdev, attr->report, &report.report, | |
763 | sizeof(report) - 1, HID_FEATURE_REPORT); | |
764 | if (ret < 3) { | |
765 | hid_err(hdev, "error reading %s string: %d\n", kattr->attr.name, | |
766 | ret); | |
767 | if (ret < 0) | |
768 | return ret; | |
769 | return -EIO; | |
770 | } | |
771 | ||
772 | if (report.length < 2) { | |
773 | hid_err(hdev, "invalid %s string length: %d\n", | |
774 | kattr->attr.name, report.length); | |
775 | return -EIO; | |
776 | } | |
777 | ||
778 | length = report.length > ret - 1 ? ret - 1 : report.length; | |
779 | length = (length - 2) / sizeof(report.string[0]); | |
780 | ret = utf16s_to_utf8s(report.string, length, UTF16_LITTLE_ENDIAN, buf, | |
781 | PAGE_SIZE - 1); | |
782 | buf[ret++] = '\n'; | |
783 | return ret; | |
784 | } | |
785 | ||
786 | #define CP2112_PSTR_ATTR(name, _report) \ | |
c3c041ba | 787 | static struct cp2112_pstring_attribute dev_attr_##name = { \ |
e932d817 DB |
788 | .attr = __ATTR(name, (S_IWUSR | S_IRUGO), pstr_show, pstr_store), \ |
789 | .report = _report, \ | |
790 | }; | |
791 | ||
792 | CP2112_PSTR_ATTR(manufacturer, CP2112_MANUFACTURER_STRING); | |
793 | CP2112_PSTR_ATTR(product, CP2112_PRODUCT_STRING); | |
794 | CP2112_PSTR_ATTR(serial, CP2112_SERIAL_STRING); | |
795 | ||
796 | #undef CP2112_PSTR_ATTR | |
797 | ||
798 | static const struct attribute_group cp2112_attr_group = { | |
799 | .attrs = (struct attribute *[]){ | |
800 | &dev_attr_vendor_id.attr, | |
801 | &dev_attr_product_id.attr, | |
802 | &dev_attr_max_power.attr, | |
803 | &dev_attr_power_mode.attr, | |
804 | &dev_attr_release_version.attr, | |
805 | &dev_attr_manufacturer.attr.attr, | |
806 | &dev_attr_product.attr.attr, | |
807 | &dev_attr_serial.attr.attr, | |
808 | NULL | |
809 | } | |
810 | }; | |
811 | ||
812 | /* Chmoding our sysfs attributes is simply a way to expose which fields in the | |
813 | * PROM have already been programmed. We do not depend on this preventing | |
814 | * writing to these attributes since the CP2112 will simply ignore writes to | |
815 | * already-programmed fields. This is why there is no sense in fixing this | |
816 | * racy behaviour. | |
817 | */ | |
818 | static void chmod_sysfs_attrs(struct hid_device *hdev) | |
819 | { | |
820 | struct attribute **attr; | |
821 | u8 buf[2]; | |
822 | int ret; | |
823 | ||
824 | ret = cp2112_hid_get(hdev, CP2112_LOCK_BYTE, buf, sizeof(buf), | |
825 | HID_FEATURE_REPORT); | |
826 | if (ret != sizeof(buf)) { | |
827 | hid_err(hdev, "error reading lock byte: %d\n", ret); | |
828 | return; | |
829 | } | |
830 | ||
831 | for (attr = cp2112_attr_group.attrs; *attr; ++attr) { | |
832 | umode_t mode = (buf[1] & 1) ? S_IWUSR | S_IRUGO : S_IRUGO; | |
833 | ret = sysfs_chmod_file(&hdev->dev.kobj, *attr, mode); | |
834 | if (ret < 0) | |
835 | hid_err(hdev, "error chmoding sysfs file %s\n", | |
836 | (*attr)->name); | |
837 | buf[1] >>= 1; | |
838 | } | |
839 | } | |
840 | ||
841 | static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id) | |
842 | { | |
843 | struct cp2112_device *dev; | |
844 | u8 buf[3]; | |
845 | struct cp2112_smbus_config_report config; | |
846 | int ret; | |
847 | ||
848 | ret = hid_parse(hdev); | |
849 | if (ret) { | |
850 | hid_err(hdev, "parse failed\n"); | |
851 | return ret; | |
852 | } | |
853 | ||
854 | ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW); | |
855 | if (ret) { | |
856 | hid_err(hdev, "hw start failed\n"); | |
857 | return ret; | |
858 | } | |
859 | ||
860 | ret = hid_hw_open(hdev); | |
861 | if (ret) { | |
862 | hid_err(hdev, "hw open failed\n"); | |
863 | goto err_hid_stop; | |
864 | } | |
865 | ||
866 | ret = hid_hw_power(hdev, PM_HINT_FULLON); | |
867 | if (ret < 0) { | |
868 | hid_err(hdev, "power management error: %d\n", ret); | |
869 | goto err_hid_close; | |
870 | } | |
871 | ||
872 | ret = cp2112_hid_get(hdev, CP2112_GET_VERSION_INFO, buf, sizeof(buf), | |
873 | HID_FEATURE_REPORT); | |
874 | if (ret != sizeof(buf)) { | |
875 | hid_err(hdev, "error requesting version\n"); | |
876 | if (ret >= 0) | |
877 | ret = -EIO; | |
878 | goto err_power_normal; | |
879 | } | |
880 | ||
881 | hid_info(hdev, "Part Number: 0x%02X Device Version: 0x%02X\n", | |
882 | buf[1], buf[2]); | |
883 | ||
884 | ret = cp2112_hid_get(hdev, CP2112_SMBUS_CONFIG, (u8 *)&config, | |
885 | sizeof(config), HID_FEATURE_REPORT); | |
886 | if (ret != sizeof(config)) { | |
887 | hid_err(hdev, "error requesting SMBus config\n"); | |
888 | if (ret >= 0) | |
889 | ret = -EIO; | |
890 | goto err_power_normal; | |
891 | } | |
892 | ||
893 | config.retry_time = cpu_to_be16(1); | |
894 | ||
895 | ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config), | |
896 | HID_FEATURE_REPORT); | |
897 | if (ret != sizeof(config)) { | |
898 | hid_err(hdev, "error setting SMBus config\n"); | |
899 | if (ret >= 0) | |
900 | ret = -EIO; | |
901 | goto err_power_normal; | |
902 | } | |
903 | ||
904 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
905 | if (!dev) { | |
906 | ret = -ENOMEM; | |
907 | goto err_power_normal; | |
908 | } | |
909 | ||
910 | hid_set_drvdata(hdev, (void *)dev); | |
911 | dev->hdev = hdev; | |
912 | dev->adap.owner = THIS_MODULE; | |
913 | dev->adap.class = I2C_CLASS_HWMON; | |
914 | dev->adap.algo = &smbus_algorithm; | |
915 | dev->adap.algo_data = dev; | |
916 | dev->adap.dev.parent = &hdev->dev; | |
917 | snprintf(dev->adap.name, sizeof(dev->adap.name), | |
918 | "CP2112 SMBus Bridge on hiddev%d", hdev->minor); | |
919 | init_waitqueue_head(&dev->wait); | |
920 | ||
921 | hid_device_io_start(hdev); | |
922 | ret = i2c_add_adapter(&dev->adap); | |
923 | hid_device_io_stop(hdev); | |
924 | ||
925 | if (ret) { | |
926 | hid_err(hdev, "error registering i2c adapter\n"); | |
927 | goto err_free_dev; | |
928 | } | |
929 | ||
930 | hid_dbg(hdev, "adapter registered\n"); | |
931 | ||
932 | dev->gc.label = "cp2112_gpio"; | |
933 | dev->gc.direction_input = cp2112_gpio_direction_input; | |
934 | dev->gc.direction_output = cp2112_gpio_direction_output; | |
935 | dev->gc.set = cp2112_gpio_set; | |
936 | dev->gc.get = cp2112_gpio_get; | |
937 | dev->gc.base = -1; | |
938 | dev->gc.ngpio = 8; | |
939 | dev->gc.can_sleep = 1; | |
940 | dev->gc.dev = &hdev->dev; | |
941 | ||
942 | ret = gpiochip_add(&dev->gc); | |
943 | if (ret < 0) { | |
944 | hid_err(hdev, "error registering gpio chip\n"); | |
945 | goto err_free_i2c; | |
946 | } | |
947 | ||
948 | ret = sysfs_create_group(&hdev->dev.kobj, &cp2112_attr_group); | |
949 | if (ret < 0) { | |
950 | hid_err(hdev, "error creating sysfs attrs\n"); | |
951 | goto err_gpiochip_remove; | |
952 | } | |
953 | ||
954 | chmod_sysfs_attrs(hdev); | |
955 | hid_hw_power(hdev, PM_HINT_NORMAL); | |
956 | ||
957 | return ret; | |
958 | ||
959 | err_gpiochip_remove: | |
960 | if (gpiochip_remove(&dev->gc) < 0) | |
961 | hid_err(hdev, "error removing gpio chip\n"); | |
962 | err_free_i2c: | |
963 | i2c_del_adapter(&dev->adap); | |
964 | err_free_dev: | |
965 | kfree(dev); | |
966 | err_power_normal: | |
967 | hid_hw_power(hdev, PM_HINT_NORMAL); | |
968 | err_hid_close: | |
969 | hid_hw_close(hdev); | |
970 | err_hid_stop: | |
971 | hid_hw_stop(hdev); | |
972 | return ret; | |
973 | } | |
974 | ||
975 | static void cp2112_remove(struct hid_device *hdev) | |
976 | { | |
977 | struct cp2112_device *dev = hid_get_drvdata(hdev); | |
978 | ||
979 | sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group); | |
980 | if (gpiochip_remove(&dev->gc)) | |
981 | hid_err(hdev, "unable to remove gpio chip\n"); | |
982 | i2c_del_adapter(&dev->adap); | |
983 | /* i2c_del_adapter has finished removing all i2c devices from our | |
984 | * adapter. Well behaved devices should no longer call our cp2112_xfer | |
985 | * and should have waited for any pending calls to finish. It has also | |
986 | * waited for device_unregister(&adap->dev) to complete. Therefore we | |
987 | * can safely free our struct cp2112_device. | |
988 | */ | |
989 | hid_hw_close(hdev); | |
990 | hid_hw_stop(hdev); | |
991 | kfree(dev); | |
992 | } | |
993 | ||
994 | static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report, | |
995 | u8 *data, int size) | |
996 | { | |
997 | struct cp2112_device *dev = hid_get_drvdata(hdev); | |
998 | struct cp2112_xfer_status_report *xfer = (void *)data; | |
999 | ||
1000 | switch (data[0]) { | |
1001 | case CP2112_TRANSFER_STATUS_RESPONSE: | |
1002 | hid_dbg(hdev, "xfer status: %02x %02x %04x %04x\n", | |
1003 | xfer->status0, xfer->status1, | |
1004 | be16_to_cpu(xfer->retries), be16_to_cpu(xfer->length)); | |
1005 | ||
1006 | switch (xfer->status0) { | |
1007 | case STATUS0_IDLE: | |
1008 | dev->xfer_status = -EAGAIN; | |
1009 | break; | |
1010 | case STATUS0_BUSY: | |
1011 | dev->xfer_status = -EBUSY; | |
1012 | break; | |
1013 | case STATUS0_COMPLETE: | |
1014 | dev->xfer_status = be16_to_cpu(xfer->length); | |
1015 | break; | |
1016 | case STATUS0_ERROR: | |
1017 | switch (xfer->status1) { | |
1018 | case STATUS1_TIMEOUT_NACK: | |
1019 | case STATUS1_TIMEOUT_BUS: | |
1020 | dev->xfer_status = -ETIMEDOUT; | |
1021 | break; | |
1022 | default: | |
1023 | dev->xfer_status = -EIO; | |
1024 | break; | |
1025 | } | |
1026 | break; | |
1027 | default: | |
1028 | dev->xfer_status = -EINVAL; | |
1029 | break; | |
1030 | } | |
1031 | ||
1032 | atomic_set(&dev->xfer_avail, 1); | |
1033 | break; | |
1034 | case CP2112_DATA_READ_RESPONSE: | |
1035 | hid_dbg(hdev, "read response: %02x %02x\n", data[1], data[2]); | |
1036 | ||
1037 | dev->read_length = data[2]; | |
1038 | if (dev->read_length > sizeof(dev->read_data)) | |
1039 | dev->read_length = sizeof(dev->read_data); | |
1040 | ||
1041 | memcpy(dev->read_data, &data[3], dev->read_length); | |
1042 | atomic_set(&dev->read_avail, 1); | |
1043 | break; | |
1044 | default: | |
1045 | hid_err(hdev, "unknown report\n"); | |
1046 | ||
1047 | return 0; | |
1048 | } | |
1049 | ||
1050 | wake_up_interruptible(&dev->wait); | |
1051 | return 1; | |
1052 | } | |
1053 | ||
1054 | static struct hid_driver cp2112_driver = { | |
1055 | .name = "cp2112", | |
1056 | .id_table = cp2112_devices, | |
1057 | .probe = cp2112_probe, | |
1058 | .remove = cp2112_remove, | |
1059 | .raw_event = cp2112_raw_event, | |
1060 | }; | |
1061 | ||
1062 | module_hid_driver(cp2112_driver); | |
1063 | MODULE_DESCRIPTION("Silicon Labs HID USB to SMBus master bridge"); | |
1064 | MODULE_AUTHOR("David Barksdale <dbarksdale@uplogix.com>"); | |
1065 | MODULE_LICENSE("GPL"); | |
1066 |