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e932d817 DB |
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; | |
44eda784 | 159 | u8 hwversion; |
e932d817 DB |
160 | int xfer_status; |
161 | atomic_t read_avail; | |
162 | atomic_t xfer_avail; | |
163 | struct gpio_chip gc; | |
164 | }; | |
165 | ||
166 | static int gpio_push_pull = 0xFF; | |
167 | module_param(gpio_push_pull, int, S_IRUGO | S_IWUSR); | |
168 | MODULE_PARM_DESC(gpio_push_pull, "GPIO push-pull configuration bitmask"); | |
169 | ||
170 | static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset) | |
171 | { | |
172 | struct cp2112_device *dev = container_of(chip, struct cp2112_device, | |
173 | gc); | |
174 | struct hid_device *hdev = dev->hdev; | |
175 | u8 buf[5]; | |
176 | int ret; | |
177 | ||
490051ad JK |
178 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, |
179 | sizeof(buf), HID_FEATURE_REPORT, | |
180 | HID_REQ_GET_REPORT); | |
e932d817 DB |
181 | if (ret != sizeof(buf)) { |
182 | hid_err(hdev, "error requesting GPIO config: %d\n", ret); | |
183 | return ret; | |
184 | } | |
185 | ||
186 | buf[1] &= ~(1 << offset); | |
187 | buf[2] = gpio_push_pull; | |
188 | ||
293e483d BT |
189 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, sizeof(buf), |
190 | HID_FEATURE_REPORT, HID_REQ_SET_REPORT); | |
e932d817 DB |
191 | if (ret < 0) { |
192 | hid_err(hdev, "error setting GPIO config: %d\n", ret); | |
193 | return ret; | |
194 | } | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
199 | static void cp2112_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
200 | { | |
201 | struct cp2112_device *dev = container_of(chip, struct cp2112_device, | |
202 | gc); | |
203 | struct hid_device *hdev = dev->hdev; | |
204 | u8 buf[3]; | |
205 | int ret; | |
206 | ||
207 | buf[0] = CP2112_GPIO_SET; | |
208 | buf[1] = value ? 0xff : 0; | |
209 | buf[2] = 1 << offset; | |
210 | ||
293e483d BT |
211 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_SET, buf, sizeof(buf), |
212 | HID_FEATURE_REPORT, HID_REQ_SET_REPORT); | |
e932d817 DB |
213 | if (ret < 0) |
214 | hid_err(hdev, "error setting GPIO values: %d\n", ret); | |
215 | } | |
216 | ||
217 | static int cp2112_gpio_get(struct gpio_chip *chip, unsigned offset) | |
218 | { | |
219 | struct cp2112_device *dev = container_of(chip, struct cp2112_device, | |
220 | gc); | |
221 | struct hid_device *hdev = dev->hdev; | |
222 | u8 buf[2]; | |
223 | int ret; | |
224 | ||
490051ad JK |
225 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_GET, buf, sizeof(buf), |
226 | HID_FEATURE_REPORT, HID_REQ_GET_REPORT); | |
e932d817 DB |
227 | if (ret != sizeof(buf)) { |
228 | hid_err(hdev, "error requesting GPIO values: %d\n", ret); | |
229 | return ret; | |
230 | } | |
231 | ||
232 | return (buf[1] >> offset) & 1; | |
233 | } | |
234 | ||
235 | static int cp2112_gpio_direction_output(struct gpio_chip *chip, | |
236 | unsigned offset, int value) | |
237 | { | |
238 | struct cp2112_device *dev = container_of(chip, struct cp2112_device, | |
239 | gc); | |
240 | struct hid_device *hdev = dev->hdev; | |
241 | u8 buf[5]; | |
242 | int ret; | |
243 | ||
490051ad JK |
244 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, |
245 | sizeof(buf), HID_FEATURE_REPORT, | |
246 | HID_REQ_GET_REPORT); | |
e932d817 DB |
247 | if (ret != sizeof(buf)) { |
248 | hid_err(hdev, "error requesting GPIO config: %d\n", ret); | |
249 | return ret; | |
250 | } | |
251 | ||
252 | buf[1] |= 1 << offset; | |
253 | buf[2] = gpio_push_pull; | |
254 | ||
293e483d BT |
255 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, sizeof(buf), |
256 | HID_FEATURE_REPORT, HID_REQ_SET_REPORT); | |
e932d817 DB |
257 | if (ret < 0) { |
258 | hid_err(hdev, "error setting GPIO config: %d\n", ret); | |
259 | return ret; | |
260 | } | |
261 | ||
beb9d007 AB |
262 | /* |
263 | * Set gpio value when output direction is already set, | |
264 | * as specified in AN495, Rev. 0.2, cpt. 4.4 | |
265 | */ | |
266 | cp2112_gpio_set(chip, offset, value); | |
267 | ||
e932d817 DB |
268 | return 0; |
269 | } | |
270 | ||
271 | static int cp2112_hid_get(struct hid_device *hdev, unsigned char report_number, | |
272 | u8 *data, size_t count, unsigned char report_type) | |
273 | { | |
274 | u8 *buf; | |
275 | int ret; | |
276 | ||
277 | buf = kmalloc(count, GFP_KERNEL); | |
278 | if (!buf) | |
279 | return -ENOMEM; | |
280 | ||
490051ad JK |
281 | ret = hid_hw_raw_request(hdev, report_number, buf, count, |
282 | report_type, HID_REQ_GET_REPORT); | |
e932d817 DB |
283 | memcpy(data, buf, count); |
284 | kfree(buf); | |
285 | return ret; | |
286 | } | |
287 | ||
288 | static int cp2112_hid_output(struct hid_device *hdev, u8 *data, size_t count, | |
289 | unsigned char report_type) | |
290 | { | |
291 | u8 *buf; | |
292 | int ret; | |
293 | ||
294 | buf = kmemdup(data, count, GFP_KERNEL); | |
295 | if (!buf) | |
296 | return -ENOMEM; | |
297 | ||
866e4797 BT |
298 | if (report_type == HID_OUTPUT_REPORT) |
299 | ret = hid_hw_output_report(hdev, buf, count); | |
300 | else | |
301 | ret = hid_hw_raw_request(hdev, buf[0], buf, count, report_type, | |
302 | HID_REQ_SET_REPORT); | |
303 | ||
e932d817 DB |
304 | kfree(buf); |
305 | return ret; | |
306 | } | |
307 | ||
308 | static int cp2112_wait(struct cp2112_device *dev, atomic_t *avail) | |
309 | { | |
310 | int ret = 0; | |
311 | ||
312 | /* We have sent either a CP2112_TRANSFER_STATUS_REQUEST or a | |
313 | * CP2112_DATA_READ_FORCE_SEND and we are waiting for the response to | |
314 | * come in cp2112_raw_event or timeout. There will only be one of these | |
315 | * in flight at any one time. The timeout is extremely large and is a | |
316 | * last resort if the CP2112 has died. If we do timeout we don't expect | |
317 | * to receive the response which would cause data races, it's not like | |
318 | * we can do anything about it anyway. | |
319 | */ | |
320 | ret = wait_event_interruptible_timeout(dev->wait, | |
321 | atomic_read(avail), msecs_to_jiffies(RESPONSE_TIMEOUT)); | |
322 | if (-ERESTARTSYS == ret) | |
323 | return ret; | |
324 | if (!ret) | |
325 | return -ETIMEDOUT; | |
326 | ||
327 | atomic_set(avail, 0); | |
328 | return 0; | |
329 | } | |
330 | ||
331 | static int cp2112_xfer_status(struct cp2112_device *dev) | |
332 | { | |
333 | struct hid_device *hdev = dev->hdev; | |
334 | u8 buf[2]; | |
335 | int ret; | |
336 | ||
337 | buf[0] = CP2112_TRANSFER_STATUS_REQUEST; | |
338 | buf[1] = 0x01; | |
339 | atomic_set(&dev->xfer_avail, 0); | |
340 | ||
341 | ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); | |
342 | if (ret < 0) { | |
343 | hid_warn(hdev, "Error requesting status: %d\n", ret); | |
344 | return ret; | |
345 | } | |
346 | ||
347 | ret = cp2112_wait(dev, &dev->xfer_avail); | |
348 | if (ret) | |
349 | return ret; | |
350 | ||
351 | return dev->xfer_status; | |
352 | } | |
353 | ||
354 | static int cp2112_read(struct cp2112_device *dev, u8 *data, size_t size) | |
355 | { | |
356 | struct hid_device *hdev = dev->hdev; | |
357 | struct cp2112_force_read_report report; | |
358 | int ret; | |
359 | ||
6debce6f AB |
360 | if (size > sizeof(dev->read_data)) |
361 | size = sizeof(dev->read_data); | |
e932d817 DB |
362 | report.report = CP2112_DATA_READ_FORCE_SEND; |
363 | report.length = cpu_to_be16(size); | |
364 | ||
365 | atomic_set(&dev->read_avail, 0); | |
366 | ||
367 | ret = cp2112_hid_output(hdev, &report.report, sizeof(report), | |
368 | HID_OUTPUT_REPORT); | |
369 | if (ret < 0) { | |
370 | hid_warn(hdev, "Error requesting data: %d\n", ret); | |
371 | return ret; | |
372 | } | |
373 | ||
374 | ret = cp2112_wait(dev, &dev->read_avail); | |
375 | if (ret) | |
376 | return ret; | |
377 | ||
5a673fce | 378 | hid_dbg(hdev, "read %d of %zd bytes requested\n", |
e932d817 DB |
379 | dev->read_length, size); |
380 | ||
381 | if (size > dev->read_length) | |
382 | size = dev->read_length; | |
383 | ||
384 | memcpy(data, dev->read_data, size); | |
385 | return dev->read_length; | |
386 | } | |
387 | ||
388 | static int cp2112_read_req(void *buf, u8 slave_address, u16 length) | |
389 | { | |
390 | struct cp2112_read_req_report *report = buf; | |
391 | ||
392 | if (length < 1 || length > 512) | |
393 | return -EINVAL; | |
394 | ||
395 | report->report = CP2112_DATA_READ_REQUEST; | |
396 | report->slave_address = slave_address << 1; | |
397 | report->length = cpu_to_be16(length); | |
398 | return sizeof(*report); | |
399 | } | |
400 | ||
401 | static int cp2112_write_read_req(void *buf, u8 slave_address, u16 length, | |
402 | u8 command, u8 *data, u8 data_length) | |
403 | { | |
404 | struct cp2112_write_read_req_report *report = buf; | |
405 | ||
406 | if (length < 1 || length > 512 | |
407 | || data_length > sizeof(report->target_address) - 1) | |
408 | return -EINVAL; | |
409 | ||
410 | report->report = CP2112_DATA_WRITE_READ_REQUEST; | |
411 | report->slave_address = slave_address << 1; | |
412 | report->length = cpu_to_be16(length); | |
413 | report->target_address_length = data_length + 1; | |
414 | report->target_address[0] = command; | |
415 | memcpy(&report->target_address[1], data, data_length); | |
416 | return data_length + 6; | |
417 | } | |
418 | ||
419 | static int cp2112_write_req(void *buf, u8 slave_address, u8 command, u8 *data, | |
420 | u8 data_length) | |
421 | { | |
422 | struct cp2112_write_req_report *report = buf; | |
423 | ||
424 | if (data_length > sizeof(report->data) - 1) | |
425 | return -EINVAL; | |
426 | ||
427 | report->report = CP2112_DATA_WRITE_REQUEST; | |
428 | report->slave_address = slave_address << 1; | |
429 | report->length = data_length + 1; | |
430 | report->data[0] = command; | |
431 | memcpy(&report->data[1], data, data_length); | |
432 | return data_length + 4; | |
433 | } | |
434 | ||
b9029345 AB |
435 | static int cp2112_i2c_write_req(void *buf, u8 slave_address, u8 *data, |
436 | u8 data_length) | |
437 | { | |
438 | struct cp2112_write_req_report *report = buf; | |
439 | ||
440 | if (data_length > sizeof(report->data)) | |
441 | return -EINVAL; | |
442 | ||
443 | report->report = CP2112_DATA_WRITE_REQUEST; | |
444 | report->slave_address = slave_address << 1; | |
445 | report->length = data_length; | |
446 | memcpy(report->data, data, data_length); | |
447 | return data_length + 3; | |
448 | } | |
449 | ||
44eda784 EW |
450 | static int cp2112_i2c_write_read_req(void *buf, u8 slave_address, |
451 | u8 *addr, int addr_length, | |
452 | int read_length) | |
453 | { | |
454 | struct cp2112_write_read_req_report *report = buf; | |
455 | ||
456 | if (read_length < 1 || read_length > 512 || | |
457 | addr_length > sizeof(report->target_address)) | |
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(read_length); | |
463 | report->target_address_length = addr_length; | |
464 | memcpy(report->target_address, addr, addr_length); | |
465 | return addr_length + 5; | |
466 | } | |
467 | ||
b9029345 AB |
468 | static int cp2112_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, |
469 | int num) | |
470 | { | |
471 | struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; | |
472 | struct hid_device *hdev = dev->hdev; | |
473 | u8 buf[64]; | |
474 | ssize_t count; | |
44eda784 EW |
475 | ssize_t read_length = 0; |
476 | u8 *read_buf = NULL; | |
b9029345 AB |
477 | unsigned int retries; |
478 | int ret; | |
479 | ||
480 | hid_dbg(hdev, "I2C %d messages\n", num); | |
481 | ||
44eda784 EW |
482 | if (num == 1) { |
483 | if (msgs->flags & I2C_M_RD) { | |
484 | hid_dbg(hdev, "I2C read %#04x len %d\n", | |
485 | msgs->addr, msgs->len); | |
486 | read_length = msgs->len; | |
487 | read_buf = msgs->buf; | |
488 | count = cp2112_read_req(buf, msgs->addr, msgs->len); | |
489 | } else { | |
490 | hid_dbg(hdev, "I2C write %#04x len %d\n", | |
491 | msgs->addr, msgs->len); | |
492 | count = cp2112_i2c_write_req(buf, msgs->addr, | |
493 | msgs->buf, msgs->len); | |
494 | } | |
495 | if (count < 0) | |
496 | return count; | |
497 | } else if (dev->hwversion > 1 && /* no repeated start in rev 1 */ | |
498 | num == 2 && | |
499 | msgs[0].addr == msgs[1].addr && | |
500 | !(msgs[0].flags & I2C_M_RD) && (msgs[1].flags & I2C_M_RD)) { | |
501 | hid_dbg(hdev, "I2C write-read %#04x wlen %d rlen %d\n", | |
502 | msgs[0].addr, msgs[0].len, msgs[1].len); | |
503 | read_length = msgs[1].len; | |
504 | read_buf = msgs[1].buf; | |
505 | count = cp2112_i2c_write_read_req(buf, msgs[0].addr, | |
506 | msgs[0].buf, msgs[0].len, msgs[1].len); | |
507 | if (count < 0) | |
508 | return count; | |
509 | } else { | |
b9029345 AB |
510 | hid_err(hdev, |
511 | "Multi-message I2C transactions not supported\n"); | |
512 | return -EOPNOTSUPP; | |
513 | } | |
514 | ||
b9029345 AB |
515 | ret = hid_hw_power(hdev, PM_HINT_FULLON); |
516 | if (ret < 0) { | |
517 | hid_err(hdev, "power management error: %d\n", ret); | |
518 | return ret; | |
519 | } | |
520 | ||
521 | ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); | |
522 | if (ret < 0) { | |
523 | hid_warn(hdev, "Error starting transaction: %d\n", ret); | |
524 | goto power_normal; | |
525 | } | |
526 | ||
527 | for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { | |
528 | ret = cp2112_xfer_status(dev); | |
529 | if (-EBUSY == ret) | |
530 | continue; | |
531 | if (ret < 0) | |
532 | goto power_normal; | |
533 | break; | |
534 | } | |
535 | ||
536 | if (XFER_STATUS_RETRIES <= retries) { | |
537 | hid_warn(hdev, "Transfer timed out, cancelling.\n"); | |
538 | buf[0] = CP2112_CANCEL_TRANSFER; | |
539 | buf[1] = 0x01; | |
540 | ||
541 | ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); | |
542 | if (ret < 0) | |
543 | hid_warn(hdev, "Error cancelling transaction: %d\n", | |
544 | ret); | |
545 | ||
546 | ret = -ETIMEDOUT; | |
547 | goto power_normal; | |
548 | } | |
549 | ||
44eda784 EW |
550 | for (count = 0; count < read_length;) { |
551 | ret = cp2112_read(dev, read_buf + count, read_length - count); | |
5ddfb12e EW |
552 | if (ret < 0) |
553 | goto power_normal; | |
554 | if (ret == 0) { | |
555 | hid_err(hdev, "read returned 0\n"); | |
556 | ret = -EIO; | |
557 | goto power_normal; | |
558 | } | |
559 | count += ret; | |
44eda784 | 560 | if (count > read_length) { |
5ddfb12e EW |
561 | /* |
562 | * The hardware returned too much data. | |
563 | * This is mostly harmless because cp2112_read() | |
564 | * has a limit check so didn't overrun our | |
565 | * buffer. Nevertheless, we return an error | |
566 | * because something is seriously wrong and | |
567 | * it shouldn't go unnoticed. | |
568 | */ | |
569 | hid_err(hdev, "long read: %d > %zd\n", | |
44eda784 | 570 | ret, read_length - count + ret); |
5ddfb12e EW |
571 | ret = -EIO; |
572 | goto power_normal; | |
573 | } | |
b9029345 AB |
574 | } |
575 | ||
b9029345 | 576 | /* return the number of transferred messages */ |
44eda784 | 577 | ret = num; |
b9029345 AB |
578 | |
579 | power_normal: | |
580 | hid_hw_power(hdev, PM_HINT_NORMAL); | |
581 | hid_dbg(hdev, "I2C transfer finished: %d\n", ret); | |
582 | return ret; | |
583 | } | |
584 | ||
e932d817 DB |
585 | static int cp2112_xfer(struct i2c_adapter *adap, u16 addr, |
586 | unsigned short flags, char read_write, u8 command, | |
587 | int size, union i2c_smbus_data *data) | |
588 | { | |
589 | struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; | |
590 | struct hid_device *hdev = dev->hdev; | |
591 | u8 buf[64]; | |
592 | __be16 word; | |
0438ee70 | 593 | ssize_t count; |
e932d817 DB |
594 | size_t read_length = 0; |
595 | unsigned int retries; | |
596 | int ret; | |
597 | ||
598 | hid_dbg(hdev, "%s addr 0x%x flags 0x%x cmd 0x%x size %d\n", | |
599 | read_write == I2C_SMBUS_WRITE ? "write" : "read", | |
600 | addr, flags, command, size); | |
601 | ||
602 | switch (size) { | |
603 | case I2C_SMBUS_BYTE: | |
604 | read_length = 1; | |
605 | ||
606 | if (I2C_SMBUS_READ == read_write) | |
607 | count = cp2112_read_req(buf, addr, read_length); | |
608 | else | |
6d00d153 | 609 | count = cp2112_write_req(buf, addr, command, NULL, |
e932d817 DB |
610 | 0); |
611 | break; | |
612 | case I2C_SMBUS_BYTE_DATA: | |
613 | read_length = 1; | |
614 | ||
615 | if (I2C_SMBUS_READ == read_write) | |
616 | count = cp2112_write_read_req(buf, addr, read_length, | |
617 | command, NULL, 0); | |
618 | else | |
619 | count = cp2112_write_req(buf, addr, command, | |
620 | &data->byte, 1); | |
621 | break; | |
622 | case I2C_SMBUS_WORD_DATA: | |
623 | read_length = 2; | |
624 | word = cpu_to_be16(data->word); | |
625 | ||
626 | if (I2C_SMBUS_READ == read_write) | |
627 | count = cp2112_write_read_req(buf, addr, read_length, | |
628 | command, NULL, 0); | |
629 | else | |
630 | count = cp2112_write_req(buf, addr, command, | |
631 | (u8 *)&word, 2); | |
632 | break; | |
633 | case I2C_SMBUS_PROC_CALL: | |
634 | size = I2C_SMBUS_WORD_DATA; | |
635 | read_write = I2C_SMBUS_READ; | |
636 | read_length = 2; | |
637 | word = cpu_to_be16(data->word); | |
638 | ||
639 | count = cp2112_write_read_req(buf, addr, read_length, command, | |
640 | (u8 *)&word, 2); | |
641 | break; | |
642 | case I2C_SMBUS_I2C_BLOCK_DATA: | |
643 | size = I2C_SMBUS_BLOCK_DATA; | |
644 | /* fallthrough */ | |
645 | case I2C_SMBUS_BLOCK_DATA: | |
646 | if (I2C_SMBUS_READ == read_write) { | |
647 | count = cp2112_write_read_req(buf, addr, | |
648 | I2C_SMBUS_BLOCK_MAX, | |
649 | command, NULL, 0); | |
650 | } else { | |
651 | count = cp2112_write_req(buf, addr, command, | |
652 | data->block, | |
653 | data->block[0] + 1); | |
654 | } | |
655 | break; | |
656 | case I2C_SMBUS_BLOCK_PROC_CALL: | |
657 | size = I2C_SMBUS_BLOCK_DATA; | |
658 | read_write = I2C_SMBUS_READ; | |
659 | ||
660 | count = cp2112_write_read_req(buf, addr, I2C_SMBUS_BLOCK_MAX, | |
661 | command, data->block, | |
662 | data->block[0] + 1); | |
663 | break; | |
664 | default: | |
665 | hid_warn(hdev, "Unsupported transaction %d\n", size); | |
666 | return -EOPNOTSUPP; | |
667 | } | |
668 | ||
669 | if (count < 0) | |
670 | return count; | |
671 | ||
672 | ret = hid_hw_power(hdev, PM_HINT_FULLON); | |
673 | if (ret < 0) { | |
674 | hid_err(hdev, "power management error: %d\n", ret); | |
675 | return ret; | |
676 | } | |
677 | ||
678 | ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); | |
679 | if (ret < 0) { | |
680 | hid_warn(hdev, "Error starting transaction: %d\n", ret); | |
681 | goto power_normal; | |
682 | } | |
683 | ||
684 | for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { | |
685 | ret = cp2112_xfer_status(dev); | |
686 | if (-EBUSY == ret) | |
687 | continue; | |
688 | if (ret < 0) | |
689 | goto power_normal; | |
690 | break; | |
691 | } | |
692 | ||
693 | if (XFER_STATUS_RETRIES <= retries) { | |
694 | hid_warn(hdev, "Transfer timed out, cancelling.\n"); | |
695 | buf[0] = CP2112_CANCEL_TRANSFER; | |
696 | buf[1] = 0x01; | |
697 | ||
698 | ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); | |
699 | if (ret < 0) | |
700 | hid_warn(hdev, "Error cancelling transaction: %d\n", | |
701 | ret); | |
702 | ||
703 | ret = -ETIMEDOUT; | |
704 | goto power_normal; | |
705 | } | |
706 | ||
707 | if (I2C_SMBUS_WRITE == read_write) { | |
708 | ret = 0; | |
709 | goto power_normal; | |
710 | } | |
711 | ||
712 | if (I2C_SMBUS_BLOCK_DATA == size) | |
713 | read_length = ret; | |
714 | ||
715 | ret = cp2112_read(dev, buf, read_length); | |
716 | if (ret < 0) | |
717 | goto power_normal; | |
718 | if (ret != read_length) { | |
5a673fce | 719 | hid_warn(hdev, "short read: %d < %zd\n", ret, read_length); |
e932d817 DB |
720 | ret = -EIO; |
721 | goto power_normal; | |
722 | } | |
723 | ||
724 | switch (size) { | |
725 | case I2C_SMBUS_BYTE: | |
726 | case I2C_SMBUS_BYTE_DATA: | |
727 | data->byte = buf[0]; | |
728 | break; | |
729 | case I2C_SMBUS_WORD_DATA: | |
730 | data->word = be16_to_cpup((__be16 *)buf); | |
731 | break; | |
732 | case I2C_SMBUS_BLOCK_DATA: | |
733 | if (read_length > I2C_SMBUS_BLOCK_MAX) { | |
734 | ret = -EPROTO; | |
735 | goto power_normal; | |
736 | } | |
737 | ||
738 | memcpy(data->block, buf, read_length); | |
739 | break; | |
740 | } | |
741 | ||
742 | ret = 0; | |
743 | power_normal: | |
744 | hid_hw_power(hdev, PM_HINT_NORMAL); | |
745 | hid_dbg(hdev, "transfer finished: %d\n", ret); | |
746 | return ret; | |
747 | } | |
748 | ||
749 | static u32 cp2112_functionality(struct i2c_adapter *adap) | |
750 | { | |
b9029345 AB |
751 | return I2C_FUNC_I2C | |
752 | I2C_FUNC_SMBUS_BYTE | | |
e932d817 DB |
753 | I2C_FUNC_SMBUS_BYTE_DATA | |
754 | I2C_FUNC_SMBUS_WORD_DATA | | |
755 | I2C_FUNC_SMBUS_BLOCK_DATA | | |
756 | I2C_FUNC_SMBUS_I2C_BLOCK | | |
757 | I2C_FUNC_SMBUS_PROC_CALL | | |
758 | I2C_FUNC_SMBUS_BLOCK_PROC_CALL; | |
759 | } | |
760 | ||
761 | static const struct i2c_algorithm smbus_algorithm = { | |
b9029345 | 762 | .master_xfer = cp2112_i2c_xfer, |
e932d817 DB |
763 | .smbus_xfer = cp2112_xfer, |
764 | .functionality = cp2112_functionality, | |
765 | }; | |
766 | ||
767 | static int cp2112_get_usb_config(struct hid_device *hdev, | |
768 | struct cp2112_usb_config_report *cfg) | |
769 | { | |
770 | int ret; | |
771 | ||
772 | ret = cp2112_hid_get(hdev, CP2112_USB_CONFIG, (u8 *)cfg, sizeof(*cfg), | |
773 | HID_FEATURE_REPORT); | |
774 | if (ret != sizeof(*cfg)) { | |
775 | hid_err(hdev, "error reading usb config: %d\n", ret); | |
776 | if (ret < 0) | |
777 | return ret; | |
778 | return -EIO; | |
779 | } | |
780 | ||
781 | return 0; | |
782 | } | |
783 | ||
784 | static int cp2112_set_usb_config(struct hid_device *hdev, | |
785 | struct cp2112_usb_config_report *cfg) | |
786 | { | |
787 | int ret; | |
788 | ||
789 | BUG_ON(cfg->report != CP2112_USB_CONFIG); | |
790 | ||
791 | ret = cp2112_hid_output(hdev, (u8 *)cfg, sizeof(*cfg), | |
792 | HID_FEATURE_REPORT); | |
793 | if (ret != sizeof(*cfg)) { | |
794 | hid_err(hdev, "error writing usb config: %d\n", ret); | |
795 | if (ret < 0) | |
796 | return ret; | |
797 | return -EIO; | |
798 | } | |
799 | ||
800 | return 0; | |
801 | } | |
802 | ||
803 | static void chmod_sysfs_attrs(struct hid_device *hdev); | |
804 | ||
805 | #define CP2112_CONFIG_ATTR(name, store, format, ...) \ | |
806 | static ssize_t name##_store(struct device *kdev, \ | |
807 | struct device_attribute *attr, const char *buf, \ | |
808 | size_t count) \ | |
809 | { \ | |
810 | struct hid_device *hdev = container_of(kdev, struct hid_device, dev); \ | |
811 | struct cp2112_usb_config_report cfg; \ | |
812 | int ret = cp2112_get_usb_config(hdev, &cfg); \ | |
813 | if (ret) \ | |
814 | return ret; \ | |
815 | store; \ | |
816 | ret = cp2112_set_usb_config(hdev, &cfg); \ | |
817 | if (ret) \ | |
818 | return ret; \ | |
819 | chmod_sysfs_attrs(hdev); \ | |
820 | return count; \ | |
821 | } \ | |
822 | static ssize_t name##_show(struct device *kdev, \ | |
823 | struct device_attribute *attr, char *buf) \ | |
824 | { \ | |
825 | struct hid_device *hdev = container_of(kdev, struct hid_device, dev); \ | |
826 | struct cp2112_usb_config_report cfg; \ | |
827 | int ret = cp2112_get_usb_config(hdev, &cfg); \ | |
828 | if (ret) \ | |
829 | return ret; \ | |
830 | return scnprintf(buf, PAGE_SIZE, format, ##__VA_ARGS__); \ | |
831 | } \ | |
c3c041ba | 832 | static DEVICE_ATTR_RW(name); |
e932d817 DB |
833 | |
834 | CP2112_CONFIG_ATTR(vendor_id, ({ | |
835 | u16 vid; | |
836 | ||
837 | if (sscanf(buf, "%hi", &vid) != 1) | |
838 | return -EINVAL; | |
839 | ||
840 | cfg.vid = cpu_to_le16(vid); | |
841 | cfg.mask = 0x01; | |
842 | }), "0x%04x\n", le16_to_cpu(cfg.vid)); | |
843 | ||
844 | CP2112_CONFIG_ATTR(product_id, ({ | |
845 | u16 pid; | |
846 | ||
847 | if (sscanf(buf, "%hi", &pid) != 1) | |
848 | return -EINVAL; | |
849 | ||
850 | cfg.pid = cpu_to_le16(pid); | |
851 | cfg.mask = 0x02; | |
852 | }), "0x%04x\n", le16_to_cpu(cfg.pid)); | |
853 | ||
854 | CP2112_CONFIG_ATTR(max_power, ({ | |
855 | int mA; | |
856 | ||
857 | if (sscanf(buf, "%i", &mA) != 1) | |
858 | return -EINVAL; | |
859 | ||
860 | cfg.max_power = (mA + 1) / 2; | |
861 | cfg.mask = 0x04; | |
862 | }), "%u mA\n", cfg.max_power * 2); | |
863 | ||
864 | CP2112_CONFIG_ATTR(power_mode, ({ | |
865 | if (sscanf(buf, "%hhi", &cfg.power_mode) != 1) | |
866 | return -EINVAL; | |
867 | ||
868 | cfg.mask = 0x08; | |
869 | }), "%u\n", cfg.power_mode); | |
870 | ||
871 | CP2112_CONFIG_ATTR(release_version, ({ | |
872 | if (sscanf(buf, "%hhi.%hhi", &cfg.release_major, &cfg.release_minor) | |
873 | != 2) | |
874 | return -EINVAL; | |
875 | ||
876 | cfg.mask = 0x10; | |
877 | }), "%u.%u\n", cfg.release_major, cfg.release_minor); | |
878 | ||
879 | #undef CP2112_CONFIG_ATTR | |
880 | ||
881 | struct cp2112_pstring_attribute { | |
882 | struct device_attribute attr; | |
883 | unsigned char report; | |
884 | }; | |
885 | ||
886 | static ssize_t pstr_store(struct device *kdev, | |
887 | struct device_attribute *kattr, const char *buf, | |
888 | size_t count) | |
889 | { | |
890 | struct hid_device *hdev = container_of(kdev, struct hid_device, dev); | |
891 | struct cp2112_pstring_attribute *attr = | |
892 | container_of(kattr, struct cp2112_pstring_attribute, attr); | |
893 | struct cp2112_string_report report; | |
894 | int ret; | |
895 | ||
896 | memset(&report, 0, sizeof(report)); | |
897 | ||
898 | ret = utf8s_to_utf16s(buf, count, UTF16_LITTLE_ENDIAN, | |
899 | report.string, ARRAY_SIZE(report.string)); | |
900 | report.report = attr->report; | |
901 | report.length = ret * sizeof(report.string[0]) + 2; | |
902 | report.type = USB_DT_STRING; | |
903 | ||
904 | ret = cp2112_hid_output(hdev, &report.report, report.length + 1, | |
905 | HID_FEATURE_REPORT); | |
906 | if (ret != report.length + 1) { | |
907 | hid_err(hdev, "error writing %s string: %d\n", kattr->attr.name, | |
908 | ret); | |
909 | if (ret < 0) | |
910 | return ret; | |
911 | return -EIO; | |
912 | } | |
913 | ||
914 | chmod_sysfs_attrs(hdev); | |
915 | return count; | |
916 | } | |
917 | ||
918 | static ssize_t pstr_show(struct device *kdev, | |
919 | struct device_attribute *kattr, char *buf) | |
920 | { | |
921 | struct hid_device *hdev = container_of(kdev, struct hid_device, dev); | |
922 | struct cp2112_pstring_attribute *attr = | |
923 | container_of(kattr, struct cp2112_pstring_attribute, attr); | |
924 | struct cp2112_string_report report; | |
925 | u8 length; | |
926 | int ret; | |
927 | ||
928 | ret = cp2112_hid_get(hdev, attr->report, &report.report, | |
929 | sizeof(report) - 1, HID_FEATURE_REPORT); | |
930 | if (ret < 3) { | |
931 | hid_err(hdev, "error reading %s string: %d\n", kattr->attr.name, | |
932 | ret); | |
933 | if (ret < 0) | |
934 | return ret; | |
935 | return -EIO; | |
936 | } | |
937 | ||
938 | if (report.length < 2) { | |
939 | hid_err(hdev, "invalid %s string length: %d\n", | |
940 | kattr->attr.name, report.length); | |
941 | return -EIO; | |
942 | } | |
943 | ||
944 | length = report.length > ret - 1 ? ret - 1 : report.length; | |
945 | length = (length - 2) / sizeof(report.string[0]); | |
946 | ret = utf16s_to_utf8s(report.string, length, UTF16_LITTLE_ENDIAN, buf, | |
947 | PAGE_SIZE - 1); | |
948 | buf[ret++] = '\n'; | |
949 | return ret; | |
950 | } | |
951 | ||
952 | #define CP2112_PSTR_ATTR(name, _report) \ | |
c3c041ba | 953 | static struct cp2112_pstring_attribute dev_attr_##name = { \ |
e932d817 DB |
954 | .attr = __ATTR(name, (S_IWUSR | S_IRUGO), pstr_show, pstr_store), \ |
955 | .report = _report, \ | |
956 | }; | |
957 | ||
958 | CP2112_PSTR_ATTR(manufacturer, CP2112_MANUFACTURER_STRING); | |
959 | CP2112_PSTR_ATTR(product, CP2112_PRODUCT_STRING); | |
960 | CP2112_PSTR_ATTR(serial, CP2112_SERIAL_STRING); | |
961 | ||
962 | #undef CP2112_PSTR_ATTR | |
963 | ||
964 | static const struct attribute_group cp2112_attr_group = { | |
965 | .attrs = (struct attribute *[]){ | |
966 | &dev_attr_vendor_id.attr, | |
967 | &dev_attr_product_id.attr, | |
968 | &dev_attr_max_power.attr, | |
969 | &dev_attr_power_mode.attr, | |
970 | &dev_attr_release_version.attr, | |
971 | &dev_attr_manufacturer.attr.attr, | |
972 | &dev_attr_product.attr.attr, | |
973 | &dev_attr_serial.attr.attr, | |
974 | NULL | |
975 | } | |
976 | }; | |
977 | ||
978 | /* Chmoding our sysfs attributes is simply a way to expose which fields in the | |
979 | * PROM have already been programmed. We do not depend on this preventing | |
980 | * writing to these attributes since the CP2112 will simply ignore writes to | |
981 | * already-programmed fields. This is why there is no sense in fixing this | |
982 | * racy behaviour. | |
983 | */ | |
984 | static void chmod_sysfs_attrs(struct hid_device *hdev) | |
985 | { | |
986 | struct attribute **attr; | |
987 | u8 buf[2]; | |
988 | int ret; | |
989 | ||
990 | ret = cp2112_hid_get(hdev, CP2112_LOCK_BYTE, buf, sizeof(buf), | |
991 | HID_FEATURE_REPORT); | |
992 | if (ret != sizeof(buf)) { | |
993 | hid_err(hdev, "error reading lock byte: %d\n", ret); | |
994 | return; | |
995 | } | |
996 | ||
997 | for (attr = cp2112_attr_group.attrs; *attr; ++attr) { | |
998 | umode_t mode = (buf[1] & 1) ? S_IWUSR | S_IRUGO : S_IRUGO; | |
999 | ret = sysfs_chmod_file(&hdev->dev.kobj, *attr, mode); | |
1000 | if (ret < 0) | |
1001 | hid_err(hdev, "error chmoding sysfs file %s\n", | |
1002 | (*attr)->name); | |
1003 | buf[1] >>= 1; | |
1004 | } | |
1005 | } | |
1006 | ||
1007 | static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id) | |
1008 | { | |
1009 | struct cp2112_device *dev; | |
1010 | u8 buf[3]; | |
1011 | struct cp2112_smbus_config_report config; | |
1012 | int ret; | |
1013 | ||
1014 | ret = hid_parse(hdev); | |
1015 | if (ret) { | |
1016 | hid_err(hdev, "parse failed\n"); | |
1017 | return ret; | |
1018 | } | |
1019 | ||
1020 | ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW); | |
1021 | if (ret) { | |
1022 | hid_err(hdev, "hw start failed\n"); | |
1023 | return ret; | |
1024 | } | |
1025 | ||
1026 | ret = hid_hw_open(hdev); | |
1027 | if (ret) { | |
1028 | hid_err(hdev, "hw open failed\n"); | |
1029 | goto err_hid_stop; | |
1030 | } | |
1031 | ||
1032 | ret = hid_hw_power(hdev, PM_HINT_FULLON); | |
1033 | if (ret < 0) { | |
1034 | hid_err(hdev, "power management error: %d\n", ret); | |
1035 | goto err_hid_close; | |
1036 | } | |
1037 | ||
1038 | ret = cp2112_hid_get(hdev, CP2112_GET_VERSION_INFO, buf, sizeof(buf), | |
1039 | HID_FEATURE_REPORT); | |
1040 | if (ret != sizeof(buf)) { | |
1041 | hid_err(hdev, "error requesting version\n"); | |
1042 | if (ret >= 0) | |
1043 | ret = -EIO; | |
1044 | goto err_power_normal; | |
1045 | } | |
1046 | ||
1047 | hid_info(hdev, "Part Number: 0x%02X Device Version: 0x%02X\n", | |
1048 | buf[1], buf[2]); | |
1049 | ||
1050 | ret = cp2112_hid_get(hdev, CP2112_SMBUS_CONFIG, (u8 *)&config, | |
1051 | sizeof(config), HID_FEATURE_REPORT); | |
1052 | if (ret != sizeof(config)) { | |
1053 | hid_err(hdev, "error requesting SMBus config\n"); | |
1054 | if (ret >= 0) | |
1055 | ret = -EIO; | |
1056 | goto err_power_normal; | |
1057 | } | |
1058 | ||
1059 | config.retry_time = cpu_to_be16(1); | |
1060 | ||
1061 | ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config), | |
1062 | HID_FEATURE_REPORT); | |
1063 | if (ret != sizeof(config)) { | |
1064 | hid_err(hdev, "error setting SMBus config\n"); | |
1065 | if (ret >= 0) | |
1066 | ret = -EIO; | |
1067 | goto err_power_normal; | |
1068 | } | |
1069 | ||
1070 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1071 | if (!dev) { | |
1072 | ret = -ENOMEM; | |
1073 | goto err_power_normal; | |
1074 | } | |
1075 | ||
1076 | hid_set_drvdata(hdev, (void *)dev); | |
1077 | dev->hdev = hdev; | |
1078 | dev->adap.owner = THIS_MODULE; | |
1079 | dev->adap.class = I2C_CLASS_HWMON; | |
1080 | dev->adap.algo = &smbus_algorithm; | |
1081 | dev->adap.algo_data = dev; | |
1082 | dev->adap.dev.parent = &hdev->dev; | |
1083 | snprintf(dev->adap.name, sizeof(dev->adap.name), | |
1084 | "CP2112 SMBus Bridge on hiddev%d", hdev->minor); | |
44eda784 | 1085 | dev->hwversion = buf[2]; |
e932d817 DB |
1086 | init_waitqueue_head(&dev->wait); |
1087 | ||
1088 | hid_device_io_start(hdev); | |
1089 | ret = i2c_add_adapter(&dev->adap); | |
1090 | hid_device_io_stop(hdev); | |
1091 | ||
1092 | if (ret) { | |
1093 | hid_err(hdev, "error registering i2c adapter\n"); | |
1094 | goto err_free_dev; | |
1095 | } | |
1096 | ||
1097 | hid_dbg(hdev, "adapter registered\n"); | |
1098 | ||
1099 | dev->gc.label = "cp2112_gpio"; | |
1100 | dev->gc.direction_input = cp2112_gpio_direction_input; | |
1101 | dev->gc.direction_output = cp2112_gpio_direction_output; | |
1102 | dev->gc.set = cp2112_gpio_set; | |
1103 | dev->gc.get = cp2112_gpio_get; | |
1104 | dev->gc.base = -1; | |
1105 | dev->gc.ngpio = 8; | |
1106 | dev->gc.can_sleep = 1; | |
1107 | dev->gc.dev = &hdev->dev; | |
1108 | ||
1109 | ret = gpiochip_add(&dev->gc); | |
1110 | if (ret < 0) { | |
1111 | hid_err(hdev, "error registering gpio chip\n"); | |
1112 | goto err_free_i2c; | |
1113 | } | |
1114 | ||
1115 | ret = sysfs_create_group(&hdev->dev.kobj, &cp2112_attr_group); | |
1116 | if (ret < 0) { | |
1117 | hid_err(hdev, "error creating sysfs attrs\n"); | |
1118 | goto err_gpiochip_remove; | |
1119 | } | |
1120 | ||
1121 | chmod_sysfs_attrs(hdev); | |
1122 | hid_hw_power(hdev, PM_HINT_NORMAL); | |
1123 | ||
1124 | return ret; | |
1125 | ||
1126 | err_gpiochip_remove: | |
88d5e520 | 1127 | gpiochip_remove(&dev->gc); |
e932d817 DB |
1128 | err_free_i2c: |
1129 | i2c_del_adapter(&dev->adap); | |
1130 | err_free_dev: | |
1131 | kfree(dev); | |
1132 | err_power_normal: | |
1133 | hid_hw_power(hdev, PM_HINT_NORMAL); | |
1134 | err_hid_close: | |
1135 | hid_hw_close(hdev); | |
1136 | err_hid_stop: | |
1137 | hid_hw_stop(hdev); | |
1138 | return ret; | |
1139 | } | |
1140 | ||
1141 | static void cp2112_remove(struct hid_device *hdev) | |
1142 | { | |
1143 | struct cp2112_device *dev = hid_get_drvdata(hdev); | |
1144 | ||
1145 | sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group); | |
88d5e520 | 1146 | gpiochip_remove(&dev->gc); |
e932d817 DB |
1147 | i2c_del_adapter(&dev->adap); |
1148 | /* i2c_del_adapter has finished removing all i2c devices from our | |
1149 | * adapter. Well behaved devices should no longer call our cp2112_xfer | |
1150 | * and should have waited for any pending calls to finish. It has also | |
1151 | * waited for device_unregister(&adap->dev) to complete. Therefore we | |
1152 | * can safely free our struct cp2112_device. | |
1153 | */ | |
1154 | hid_hw_close(hdev); | |
1155 | hid_hw_stop(hdev); | |
1156 | kfree(dev); | |
1157 | } | |
1158 | ||
1159 | static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report, | |
1160 | u8 *data, int size) | |
1161 | { | |
1162 | struct cp2112_device *dev = hid_get_drvdata(hdev); | |
1163 | struct cp2112_xfer_status_report *xfer = (void *)data; | |
1164 | ||
1165 | switch (data[0]) { | |
1166 | case CP2112_TRANSFER_STATUS_RESPONSE: | |
1167 | hid_dbg(hdev, "xfer status: %02x %02x %04x %04x\n", | |
1168 | xfer->status0, xfer->status1, | |
1169 | be16_to_cpu(xfer->retries), be16_to_cpu(xfer->length)); | |
1170 | ||
1171 | switch (xfer->status0) { | |
1172 | case STATUS0_IDLE: | |
1173 | dev->xfer_status = -EAGAIN; | |
1174 | break; | |
1175 | case STATUS0_BUSY: | |
1176 | dev->xfer_status = -EBUSY; | |
1177 | break; | |
1178 | case STATUS0_COMPLETE: | |
1179 | dev->xfer_status = be16_to_cpu(xfer->length); | |
1180 | break; | |
1181 | case STATUS0_ERROR: | |
1182 | switch (xfer->status1) { | |
1183 | case STATUS1_TIMEOUT_NACK: | |
1184 | case STATUS1_TIMEOUT_BUS: | |
1185 | dev->xfer_status = -ETIMEDOUT; | |
1186 | break; | |
1187 | default: | |
1188 | dev->xfer_status = -EIO; | |
1189 | break; | |
1190 | } | |
1191 | break; | |
1192 | default: | |
1193 | dev->xfer_status = -EINVAL; | |
1194 | break; | |
1195 | } | |
1196 | ||
1197 | atomic_set(&dev->xfer_avail, 1); | |
1198 | break; | |
1199 | case CP2112_DATA_READ_RESPONSE: | |
1200 | hid_dbg(hdev, "read response: %02x %02x\n", data[1], data[2]); | |
1201 | ||
1202 | dev->read_length = data[2]; | |
1203 | if (dev->read_length > sizeof(dev->read_data)) | |
1204 | dev->read_length = sizeof(dev->read_data); | |
1205 | ||
1206 | memcpy(dev->read_data, &data[3], dev->read_length); | |
1207 | atomic_set(&dev->read_avail, 1); | |
1208 | break; | |
1209 | default: | |
1210 | hid_err(hdev, "unknown report\n"); | |
1211 | ||
1212 | return 0; | |
1213 | } | |
1214 | ||
1215 | wake_up_interruptible(&dev->wait); | |
1216 | return 1; | |
1217 | } | |
1218 | ||
1219 | static struct hid_driver cp2112_driver = { | |
1220 | .name = "cp2112", | |
1221 | .id_table = cp2112_devices, | |
1222 | .probe = cp2112_probe, | |
1223 | .remove = cp2112_remove, | |
1224 | .raw_event = cp2112_raw_event, | |
1225 | }; | |
1226 | ||
1227 | module_hid_driver(cp2112_driver); | |
1228 | MODULE_DESCRIPTION("Silicon Labs HID USB to SMBus master bridge"); | |
1229 | MODULE_AUTHOR("David Barksdale <dbarksdale@uplogix.com>"); | |
1230 | MODULE_LICENSE("GPL"); | |
1231 |