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2025cf9e | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e932d817 DB |
2 | /* |
3 | * hid-cp2112.c - Silicon Labs HID USB to SMBus master bridge | |
4 | * Copyright (c) 2013,2014 Uplogix, Inc. | |
5 | * David Barksdale <dbarksdale@uplogix.com> | |
e932d817 DB |
6 | */ |
7 | ||
8 | /* | |
9 | * The Silicon Labs CP2112 chip is a USB HID device which provides an | |
10 | * SMBus controller for talking to slave devices and 8 GPIO pins. The | |
11 | * host communicates with the CP2112 via raw HID reports. | |
12 | * | |
13 | * Data Sheet: | |
14 | * http://www.silabs.com/Support%20Documents/TechnicalDocs/CP2112.pdf | |
15 | * Programming Interface Specification: | |
ce4dd820 | 16 | * https://www.silabs.com/documents/public/application-notes/an495-cp2112-interface-specification.pdf |
e932d817 DB |
17 | */ |
18 | ||
13de9cca | 19 | #include <linux/gpio.h> |
47513c2f | 20 | #include <linux/gpio/driver.h> |
e932d817 | 21 | #include <linux/hid.h> |
42cb6b35 | 22 | #include <linux/hidraw.h> |
e932d817 DB |
23 | #include <linux/i2c.h> |
24 | #include <linux/module.h> | |
25 | #include <linux/nls.h> | |
26 | #include <linux/usb/ch9.h> | |
27 | #include "hid-ids.h" | |
28 | ||
1ffb3c40 BT |
29 | #define CP2112_REPORT_MAX_LENGTH 64 |
30 | #define CP2112_GPIO_CONFIG_LENGTH 5 | |
31 | #define CP2112_GPIO_GET_LENGTH 2 | |
32 | #define CP2112_GPIO_SET_LENGTH 3 | |
33 | ||
e932d817 DB |
34 | enum { |
35 | CP2112_GPIO_CONFIG = 0x02, | |
36 | CP2112_GPIO_GET = 0x03, | |
37 | CP2112_GPIO_SET = 0x04, | |
38 | CP2112_GET_VERSION_INFO = 0x05, | |
39 | CP2112_SMBUS_CONFIG = 0x06, | |
40 | CP2112_DATA_READ_REQUEST = 0x10, | |
41 | CP2112_DATA_WRITE_READ_REQUEST = 0x11, | |
42 | CP2112_DATA_READ_FORCE_SEND = 0x12, | |
43 | CP2112_DATA_READ_RESPONSE = 0x13, | |
44 | CP2112_DATA_WRITE_REQUEST = 0x14, | |
45 | CP2112_TRANSFER_STATUS_REQUEST = 0x15, | |
46 | CP2112_TRANSFER_STATUS_RESPONSE = 0x16, | |
47 | CP2112_CANCEL_TRANSFER = 0x17, | |
48 | CP2112_LOCK_BYTE = 0x20, | |
49 | CP2112_USB_CONFIG = 0x21, | |
50 | CP2112_MANUFACTURER_STRING = 0x22, | |
51 | CP2112_PRODUCT_STRING = 0x23, | |
52 | CP2112_SERIAL_STRING = 0x24, | |
53 | }; | |
54 | ||
55 | enum { | |
56 | STATUS0_IDLE = 0x00, | |
57 | STATUS0_BUSY = 0x01, | |
58 | STATUS0_COMPLETE = 0x02, | |
59 | STATUS0_ERROR = 0x03, | |
60 | }; | |
61 | ||
62 | enum { | |
63 | STATUS1_TIMEOUT_NACK = 0x00, | |
64 | STATUS1_TIMEOUT_BUS = 0x01, | |
65 | STATUS1_ARBITRATION_LOST = 0x02, | |
66 | STATUS1_READ_INCOMPLETE = 0x03, | |
67 | STATUS1_WRITE_INCOMPLETE = 0x04, | |
68 | STATUS1_SUCCESS = 0x05, | |
69 | }; | |
70 | ||
71 | struct cp2112_smbus_config_report { | |
72 | u8 report; /* CP2112_SMBUS_CONFIG */ | |
73 | __be32 clock_speed; /* Hz */ | |
74 | u8 device_address; /* Stored in the upper 7 bits */ | |
75 | u8 auto_send_read; /* 1 = enabled, 0 = disabled */ | |
76 | __be16 write_timeout; /* ms, 0 = no timeout */ | |
77 | __be16 read_timeout; /* ms, 0 = no timeout */ | |
78 | u8 scl_low_timeout; /* 1 = enabled, 0 = disabled */ | |
79 | __be16 retry_time; /* # of retries, 0 = no limit */ | |
80 | } __packed; | |
81 | ||
82 | struct cp2112_usb_config_report { | |
83 | u8 report; /* CP2112_USB_CONFIG */ | |
84 | __le16 vid; /* Vendor ID */ | |
85 | __le16 pid; /* Product ID */ | |
86 | u8 max_power; /* Power requested in 2mA units */ | |
87 | u8 power_mode; /* 0x00 = bus powered | |
88 | 0x01 = self powered & regulator off | |
89 | 0x02 = self powered & regulator on */ | |
90 | u8 release_major; | |
91 | u8 release_minor; | |
92 | u8 mask; /* What fields to program */ | |
93 | } __packed; | |
94 | ||
95 | struct cp2112_read_req_report { | |
96 | u8 report; /* CP2112_DATA_READ_REQUEST */ | |
97 | u8 slave_address; | |
98 | __be16 length; | |
99 | } __packed; | |
100 | ||
101 | struct cp2112_write_read_req_report { | |
102 | u8 report; /* CP2112_DATA_WRITE_READ_REQUEST */ | |
103 | u8 slave_address; | |
104 | __be16 length; | |
105 | u8 target_address_length; | |
106 | u8 target_address[16]; | |
107 | } __packed; | |
108 | ||
109 | struct cp2112_write_req_report { | |
110 | u8 report; /* CP2112_DATA_WRITE_REQUEST */ | |
111 | u8 slave_address; | |
112 | u8 length; | |
113 | u8 data[61]; | |
114 | } __packed; | |
115 | ||
116 | struct cp2112_force_read_report { | |
117 | u8 report; /* CP2112_DATA_READ_FORCE_SEND */ | |
118 | __be16 length; | |
119 | } __packed; | |
120 | ||
121 | struct cp2112_xfer_status_report { | |
122 | u8 report; /* CP2112_TRANSFER_STATUS_RESPONSE */ | |
123 | u8 status0; /* STATUS0_* */ | |
124 | u8 status1; /* STATUS1_* */ | |
125 | __be16 retries; | |
126 | __be16 length; | |
127 | } __packed; | |
128 | ||
129 | struct cp2112_string_report { | |
130 | u8 dummy; /* force .string to be aligned */ | |
131 | u8 report; /* CP2112_*_STRING */ | |
132 | u8 length; /* length in bytes of everyting after .report */ | |
133 | u8 type; /* USB_DT_STRING */ | |
134 | wchar_t string[30]; /* UTF16_LITTLE_ENDIAN string */ | |
135 | } __packed; | |
136 | ||
137 | /* Number of times to request transfer status before giving up waiting for a | |
138 | transfer to complete. This may need to be changed if SMBUS clock, retries, | |
139 | or read/write/scl_low timeout settings are changed. */ | |
140 | static const int XFER_STATUS_RETRIES = 10; | |
141 | ||
142 | /* Time in ms to wait for a CP2112_DATA_READ_RESPONSE or | |
143 | CP2112_TRANSFER_STATUS_RESPONSE. */ | |
144 | static const int RESPONSE_TIMEOUT = 50; | |
145 | ||
146 | static const struct hid_device_id cp2112_devices[] = { | |
147 | { HID_USB_DEVICE(USB_VENDOR_ID_CYGNAL, USB_DEVICE_ID_CYGNAL_CP2112) }, | |
148 | { } | |
149 | }; | |
150 | MODULE_DEVICE_TABLE(hid, cp2112_devices); | |
151 | ||
152 | struct cp2112_device { | |
153 | struct i2c_adapter adap; | |
154 | struct hid_device *hdev; | |
155 | wait_queue_head_t wait; | |
156 | u8 read_data[61]; | |
157 | u8 read_length; | |
44eda784 | 158 | u8 hwversion; |
e932d817 DB |
159 | int xfer_status; |
160 | atomic_t read_avail; | |
161 | atomic_t xfer_avail; | |
162 | struct gpio_chip gc; | |
1ffb3c40 | 163 | u8 *in_out_buffer; |
7a7b5df8 | 164 | struct mutex lock; |
13de9cca BT |
165 | |
166 | struct gpio_desc *desc[8]; | |
167 | bool gpio_poll; | |
168 | struct delayed_work gpio_poll_worker; | |
169 | unsigned long irq_mask; | |
170 | u8 gpio_prev_state; | |
e932d817 DB |
171 | }; |
172 | ||
173 | static int gpio_push_pull = 0xFF; | |
174 | module_param(gpio_push_pull, int, S_IRUGO | S_IWUSR); | |
175 | MODULE_PARM_DESC(gpio_push_pull, "GPIO push-pull configuration bitmask"); | |
176 | ||
177 | static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset) | |
178 | { | |
47513c2f | 179 | struct cp2112_device *dev = gpiochip_get_data(chip); |
e932d817 | 180 | struct hid_device *hdev = dev->hdev; |
1ffb3c40 | 181 | u8 *buf = dev->in_out_buffer; |
e932d817 DB |
182 | int ret; |
183 | ||
7a7b5df8 | 184 | mutex_lock(&dev->lock); |
1ffb3c40 | 185 | |
490051ad | 186 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, |
1ffb3c40 BT |
187 | CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, |
188 | HID_REQ_GET_REPORT); | |
189 | if (ret != CP2112_GPIO_CONFIG_LENGTH) { | |
e932d817 | 190 | hid_err(hdev, "error requesting GPIO config: %d\n", ret); |
7da85fbf SS |
191 | if (ret >= 0) |
192 | ret = -EIO; | |
1ffb3c40 | 193 | goto exit; |
e932d817 DB |
194 | } |
195 | ||
196 | buf[1] &= ~(1 << offset); | |
197 | buf[2] = gpio_push_pull; | |
198 | ||
1ffb3c40 BT |
199 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, |
200 | CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, | |
201 | HID_REQ_SET_REPORT); | |
7da85fbf | 202 | if (ret != CP2112_GPIO_CONFIG_LENGTH) { |
e932d817 | 203 | hid_err(hdev, "error setting GPIO config: %d\n", ret); |
7da85fbf SS |
204 | if (ret >= 0) |
205 | ret = -EIO; | |
1ffb3c40 | 206 | goto exit; |
e932d817 DB |
207 | } |
208 | ||
1ffb3c40 BT |
209 | ret = 0; |
210 | ||
211 | exit: | |
7a7b5df8 | 212 | mutex_unlock(&dev->lock); |
7da85fbf | 213 | return ret; |
e932d817 DB |
214 | } |
215 | ||
216 | static void cp2112_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
217 | { | |
47513c2f | 218 | struct cp2112_device *dev = gpiochip_get_data(chip); |
e932d817 | 219 | struct hid_device *hdev = dev->hdev; |
1ffb3c40 | 220 | u8 *buf = dev->in_out_buffer; |
e932d817 DB |
221 | int ret; |
222 | ||
7a7b5df8 | 223 | mutex_lock(&dev->lock); |
1ffb3c40 | 224 | |
e932d817 DB |
225 | buf[0] = CP2112_GPIO_SET; |
226 | buf[1] = value ? 0xff : 0; | |
227 | buf[2] = 1 << offset; | |
228 | ||
1ffb3c40 BT |
229 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_SET, buf, |
230 | CP2112_GPIO_SET_LENGTH, HID_FEATURE_REPORT, | |
231 | HID_REQ_SET_REPORT); | |
e932d817 DB |
232 | if (ret < 0) |
233 | hid_err(hdev, "error setting GPIO values: %d\n", ret); | |
1ffb3c40 | 234 | |
7a7b5df8 | 235 | mutex_unlock(&dev->lock); |
e932d817 DB |
236 | } |
237 | ||
13de9cca | 238 | static int cp2112_gpio_get_all(struct gpio_chip *chip) |
e932d817 | 239 | { |
47513c2f | 240 | struct cp2112_device *dev = gpiochip_get_data(chip); |
e932d817 | 241 | struct hid_device *hdev = dev->hdev; |
1ffb3c40 | 242 | u8 *buf = dev->in_out_buffer; |
e932d817 DB |
243 | int ret; |
244 | ||
7a7b5df8 | 245 | mutex_lock(&dev->lock); |
1ffb3c40 BT |
246 | |
247 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_GET, buf, | |
248 | CP2112_GPIO_GET_LENGTH, HID_FEATURE_REPORT, | |
249 | HID_REQ_GET_REPORT); | |
250 | if (ret != CP2112_GPIO_GET_LENGTH) { | |
e932d817 | 251 | hid_err(hdev, "error requesting GPIO values: %d\n", ret); |
1ffb3c40 BT |
252 | ret = ret < 0 ? ret : -EIO; |
253 | goto exit; | |
e932d817 DB |
254 | } |
255 | ||
13de9cca | 256 | ret = buf[1]; |
1ffb3c40 BT |
257 | |
258 | exit: | |
7a7b5df8 | 259 | mutex_unlock(&dev->lock); |
1ffb3c40 BT |
260 | |
261 | return ret; | |
e932d817 DB |
262 | } |
263 | ||
13de9cca BT |
264 | static int cp2112_gpio_get(struct gpio_chip *chip, unsigned int offset) |
265 | { | |
266 | int ret; | |
267 | ||
268 | ret = cp2112_gpio_get_all(chip); | |
269 | if (ret < 0) | |
270 | return ret; | |
271 | ||
272 | return (ret >> offset) & 1; | |
273 | } | |
274 | ||
e932d817 DB |
275 | static int cp2112_gpio_direction_output(struct gpio_chip *chip, |
276 | unsigned offset, int value) | |
277 | { | |
47513c2f | 278 | struct cp2112_device *dev = gpiochip_get_data(chip); |
e932d817 | 279 | struct hid_device *hdev = dev->hdev; |
1ffb3c40 | 280 | u8 *buf = dev->in_out_buffer; |
e932d817 DB |
281 | int ret; |
282 | ||
7a7b5df8 | 283 | mutex_lock(&dev->lock); |
1ffb3c40 | 284 | |
490051ad | 285 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, |
1ffb3c40 BT |
286 | CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, |
287 | HID_REQ_GET_REPORT); | |
288 | if (ret != CP2112_GPIO_CONFIG_LENGTH) { | |
e932d817 | 289 | hid_err(hdev, "error requesting GPIO config: %d\n", ret); |
1ffb3c40 | 290 | goto fail; |
e932d817 DB |
291 | } |
292 | ||
293 | buf[1] |= 1 << offset; | |
294 | buf[2] = gpio_push_pull; | |
295 | ||
1ffb3c40 BT |
296 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, |
297 | CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, | |
298 | HID_REQ_SET_REPORT); | |
e932d817 DB |
299 | if (ret < 0) { |
300 | hid_err(hdev, "error setting GPIO config: %d\n", ret); | |
1ffb3c40 | 301 | goto fail; |
e932d817 DB |
302 | } |
303 | ||
7a7b5df8 | 304 | mutex_unlock(&dev->lock); |
1ffb3c40 | 305 | |
beb9d007 AB |
306 | /* |
307 | * Set gpio value when output direction is already set, | |
308 | * as specified in AN495, Rev. 0.2, cpt. 4.4 | |
309 | */ | |
310 | cp2112_gpio_set(chip, offset, value); | |
311 | ||
e932d817 | 312 | return 0; |
1ffb3c40 BT |
313 | |
314 | fail: | |
7a7b5df8 | 315 | mutex_unlock(&dev->lock); |
1ffb3c40 | 316 | return ret < 0 ? ret : -EIO; |
e932d817 DB |
317 | } |
318 | ||
319 | static int cp2112_hid_get(struct hid_device *hdev, unsigned char report_number, | |
320 | u8 *data, size_t count, unsigned char report_type) | |
321 | { | |
322 | u8 *buf; | |
323 | int ret; | |
324 | ||
325 | buf = kmalloc(count, GFP_KERNEL); | |
326 | if (!buf) | |
327 | return -ENOMEM; | |
328 | ||
490051ad JK |
329 | ret = hid_hw_raw_request(hdev, report_number, buf, count, |
330 | report_type, HID_REQ_GET_REPORT); | |
e932d817 DB |
331 | memcpy(data, buf, count); |
332 | kfree(buf); | |
333 | return ret; | |
334 | } | |
335 | ||
336 | static int cp2112_hid_output(struct hid_device *hdev, u8 *data, size_t count, | |
337 | unsigned char report_type) | |
338 | { | |
339 | u8 *buf; | |
340 | int ret; | |
341 | ||
342 | buf = kmemdup(data, count, GFP_KERNEL); | |
343 | if (!buf) | |
344 | return -ENOMEM; | |
345 | ||
866e4797 BT |
346 | if (report_type == HID_OUTPUT_REPORT) |
347 | ret = hid_hw_output_report(hdev, buf, count); | |
348 | else | |
349 | ret = hid_hw_raw_request(hdev, buf[0], buf, count, report_type, | |
350 | HID_REQ_SET_REPORT); | |
351 | ||
e932d817 DB |
352 | kfree(buf); |
353 | return ret; | |
354 | } | |
355 | ||
356 | static int cp2112_wait(struct cp2112_device *dev, atomic_t *avail) | |
357 | { | |
358 | int ret = 0; | |
359 | ||
360 | /* We have sent either a CP2112_TRANSFER_STATUS_REQUEST or a | |
361 | * CP2112_DATA_READ_FORCE_SEND and we are waiting for the response to | |
362 | * come in cp2112_raw_event or timeout. There will only be one of these | |
363 | * in flight at any one time. The timeout is extremely large and is a | |
364 | * last resort if the CP2112 has died. If we do timeout we don't expect | |
365 | * to receive the response which would cause data races, it's not like | |
366 | * we can do anything about it anyway. | |
367 | */ | |
368 | ret = wait_event_interruptible_timeout(dev->wait, | |
369 | atomic_read(avail), msecs_to_jiffies(RESPONSE_TIMEOUT)); | |
370 | if (-ERESTARTSYS == ret) | |
371 | return ret; | |
372 | if (!ret) | |
373 | return -ETIMEDOUT; | |
374 | ||
375 | atomic_set(avail, 0); | |
376 | return 0; | |
377 | } | |
378 | ||
379 | static int cp2112_xfer_status(struct cp2112_device *dev) | |
380 | { | |
381 | struct hid_device *hdev = dev->hdev; | |
382 | u8 buf[2]; | |
383 | int ret; | |
384 | ||
385 | buf[0] = CP2112_TRANSFER_STATUS_REQUEST; | |
386 | buf[1] = 0x01; | |
387 | atomic_set(&dev->xfer_avail, 0); | |
388 | ||
389 | ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); | |
390 | if (ret < 0) { | |
391 | hid_warn(hdev, "Error requesting status: %d\n", ret); | |
392 | return ret; | |
393 | } | |
394 | ||
395 | ret = cp2112_wait(dev, &dev->xfer_avail); | |
396 | if (ret) | |
397 | return ret; | |
398 | ||
399 | return dev->xfer_status; | |
400 | } | |
401 | ||
402 | static int cp2112_read(struct cp2112_device *dev, u8 *data, size_t size) | |
403 | { | |
404 | struct hid_device *hdev = dev->hdev; | |
405 | struct cp2112_force_read_report report; | |
406 | int ret; | |
407 | ||
6debce6f AB |
408 | if (size > sizeof(dev->read_data)) |
409 | size = sizeof(dev->read_data); | |
e932d817 DB |
410 | report.report = CP2112_DATA_READ_FORCE_SEND; |
411 | report.length = cpu_to_be16(size); | |
412 | ||
413 | atomic_set(&dev->read_avail, 0); | |
414 | ||
415 | ret = cp2112_hid_output(hdev, &report.report, sizeof(report), | |
416 | HID_OUTPUT_REPORT); | |
417 | if (ret < 0) { | |
418 | hid_warn(hdev, "Error requesting data: %d\n", ret); | |
419 | return ret; | |
420 | } | |
421 | ||
422 | ret = cp2112_wait(dev, &dev->read_avail); | |
423 | if (ret) | |
424 | return ret; | |
425 | ||
5a673fce | 426 | hid_dbg(hdev, "read %d of %zd bytes requested\n", |
e932d817 DB |
427 | dev->read_length, size); |
428 | ||
429 | if (size > dev->read_length) | |
430 | size = dev->read_length; | |
431 | ||
432 | memcpy(data, dev->read_data, size); | |
433 | return dev->read_length; | |
434 | } | |
435 | ||
436 | static int cp2112_read_req(void *buf, u8 slave_address, u16 length) | |
437 | { | |
438 | struct cp2112_read_req_report *report = buf; | |
439 | ||
440 | if (length < 1 || length > 512) | |
441 | return -EINVAL; | |
442 | ||
443 | report->report = CP2112_DATA_READ_REQUEST; | |
444 | report->slave_address = slave_address << 1; | |
445 | report->length = cpu_to_be16(length); | |
446 | return sizeof(*report); | |
447 | } | |
448 | ||
449 | static int cp2112_write_read_req(void *buf, u8 slave_address, u16 length, | |
450 | u8 command, u8 *data, u8 data_length) | |
451 | { | |
452 | struct cp2112_write_read_req_report *report = buf; | |
453 | ||
454 | if (length < 1 || length > 512 | |
455 | || data_length > sizeof(report->target_address) - 1) | |
456 | return -EINVAL; | |
457 | ||
458 | report->report = CP2112_DATA_WRITE_READ_REQUEST; | |
459 | report->slave_address = slave_address << 1; | |
460 | report->length = cpu_to_be16(length); | |
461 | report->target_address_length = data_length + 1; | |
462 | report->target_address[0] = command; | |
463 | memcpy(&report->target_address[1], data, data_length); | |
464 | return data_length + 6; | |
465 | } | |
466 | ||
467 | static int cp2112_write_req(void *buf, u8 slave_address, u8 command, u8 *data, | |
468 | u8 data_length) | |
469 | { | |
470 | struct cp2112_write_req_report *report = buf; | |
471 | ||
472 | if (data_length > sizeof(report->data) - 1) | |
473 | return -EINVAL; | |
474 | ||
475 | report->report = CP2112_DATA_WRITE_REQUEST; | |
476 | report->slave_address = slave_address << 1; | |
477 | report->length = data_length + 1; | |
478 | report->data[0] = command; | |
479 | memcpy(&report->data[1], data, data_length); | |
480 | return data_length + 4; | |
481 | } | |
482 | ||
b9029345 AB |
483 | static int cp2112_i2c_write_req(void *buf, u8 slave_address, u8 *data, |
484 | u8 data_length) | |
485 | { | |
486 | struct cp2112_write_req_report *report = buf; | |
487 | ||
488 | if (data_length > sizeof(report->data)) | |
489 | return -EINVAL; | |
490 | ||
491 | report->report = CP2112_DATA_WRITE_REQUEST; | |
492 | report->slave_address = slave_address << 1; | |
493 | report->length = data_length; | |
494 | memcpy(report->data, data, data_length); | |
495 | return data_length + 3; | |
496 | } | |
497 | ||
44eda784 EW |
498 | static int cp2112_i2c_write_read_req(void *buf, u8 slave_address, |
499 | u8 *addr, int addr_length, | |
500 | int read_length) | |
501 | { | |
502 | struct cp2112_write_read_req_report *report = buf; | |
503 | ||
504 | if (read_length < 1 || read_length > 512 || | |
505 | addr_length > sizeof(report->target_address)) | |
506 | return -EINVAL; | |
507 | ||
508 | report->report = CP2112_DATA_WRITE_READ_REQUEST; | |
509 | report->slave_address = slave_address << 1; | |
510 | report->length = cpu_to_be16(read_length); | |
511 | report->target_address_length = addr_length; | |
512 | memcpy(report->target_address, addr, addr_length); | |
513 | return addr_length + 5; | |
514 | } | |
515 | ||
b9029345 AB |
516 | static int cp2112_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, |
517 | int num) | |
518 | { | |
519 | struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; | |
520 | struct hid_device *hdev = dev->hdev; | |
521 | u8 buf[64]; | |
522 | ssize_t count; | |
44eda784 EW |
523 | ssize_t read_length = 0; |
524 | u8 *read_buf = NULL; | |
b9029345 AB |
525 | unsigned int retries; |
526 | int ret; | |
527 | ||
528 | hid_dbg(hdev, "I2C %d messages\n", num); | |
529 | ||
44eda784 EW |
530 | if (num == 1) { |
531 | if (msgs->flags & I2C_M_RD) { | |
532 | hid_dbg(hdev, "I2C read %#04x len %d\n", | |
533 | msgs->addr, msgs->len); | |
534 | read_length = msgs->len; | |
535 | read_buf = msgs->buf; | |
536 | count = cp2112_read_req(buf, msgs->addr, msgs->len); | |
537 | } else { | |
538 | hid_dbg(hdev, "I2C write %#04x len %d\n", | |
539 | msgs->addr, msgs->len); | |
540 | count = cp2112_i2c_write_req(buf, msgs->addr, | |
541 | msgs->buf, msgs->len); | |
542 | } | |
543 | if (count < 0) | |
544 | return count; | |
545 | } else if (dev->hwversion > 1 && /* no repeated start in rev 1 */ | |
546 | num == 2 && | |
547 | msgs[0].addr == msgs[1].addr && | |
548 | !(msgs[0].flags & I2C_M_RD) && (msgs[1].flags & I2C_M_RD)) { | |
549 | hid_dbg(hdev, "I2C write-read %#04x wlen %d rlen %d\n", | |
550 | msgs[0].addr, msgs[0].len, msgs[1].len); | |
551 | read_length = msgs[1].len; | |
552 | read_buf = msgs[1].buf; | |
553 | count = cp2112_i2c_write_read_req(buf, msgs[0].addr, | |
554 | msgs[0].buf, msgs[0].len, msgs[1].len); | |
555 | if (count < 0) | |
556 | return count; | |
557 | } else { | |
b9029345 AB |
558 | hid_err(hdev, |
559 | "Multi-message I2C transactions not supported\n"); | |
560 | return -EOPNOTSUPP; | |
561 | } | |
562 | ||
b9029345 AB |
563 | ret = hid_hw_power(hdev, PM_HINT_FULLON); |
564 | if (ret < 0) { | |
565 | hid_err(hdev, "power management error: %d\n", ret); | |
566 | return ret; | |
567 | } | |
568 | ||
569 | ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); | |
570 | if (ret < 0) { | |
571 | hid_warn(hdev, "Error starting transaction: %d\n", ret); | |
572 | goto power_normal; | |
573 | } | |
574 | ||
575 | for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { | |
576 | ret = cp2112_xfer_status(dev); | |
577 | if (-EBUSY == ret) | |
578 | continue; | |
579 | if (ret < 0) | |
580 | goto power_normal; | |
581 | break; | |
582 | } | |
583 | ||
584 | if (XFER_STATUS_RETRIES <= retries) { | |
585 | hid_warn(hdev, "Transfer timed out, cancelling.\n"); | |
586 | buf[0] = CP2112_CANCEL_TRANSFER; | |
587 | buf[1] = 0x01; | |
588 | ||
589 | ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); | |
590 | if (ret < 0) | |
591 | hid_warn(hdev, "Error cancelling transaction: %d\n", | |
592 | ret); | |
593 | ||
594 | ret = -ETIMEDOUT; | |
595 | goto power_normal; | |
596 | } | |
597 | ||
44eda784 EW |
598 | for (count = 0; count < read_length;) { |
599 | ret = cp2112_read(dev, read_buf + count, read_length - count); | |
5ddfb12e EW |
600 | if (ret < 0) |
601 | goto power_normal; | |
602 | if (ret == 0) { | |
603 | hid_err(hdev, "read returned 0\n"); | |
604 | ret = -EIO; | |
605 | goto power_normal; | |
606 | } | |
607 | count += ret; | |
44eda784 | 608 | if (count > read_length) { |
5ddfb12e EW |
609 | /* |
610 | * The hardware returned too much data. | |
611 | * This is mostly harmless because cp2112_read() | |
612 | * has a limit check so didn't overrun our | |
613 | * buffer. Nevertheless, we return an error | |
614 | * because something is seriously wrong and | |
615 | * it shouldn't go unnoticed. | |
616 | */ | |
617 | hid_err(hdev, "long read: %d > %zd\n", | |
44eda784 | 618 | ret, read_length - count + ret); |
5ddfb12e EW |
619 | ret = -EIO; |
620 | goto power_normal; | |
621 | } | |
b9029345 AB |
622 | } |
623 | ||
b9029345 | 624 | /* return the number of transferred messages */ |
44eda784 | 625 | ret = num; |
b9029345 AB |
626 | |
627 | power_normal: | |
628 | hid_hw_power(hdev, PM_HINT_NORMAL); | |
629 | hid_dbg(hdev, "I2C transfer finished: %d\n", ret); | |
630 | return ret; | |
631 | } | |
632 | ||
e932d817 DB |
633 | static int cp2112_xfer(struct i2c_adapter *adap, u16 addr, |
634 | unsigned short flags, char read_write, u8 command, | |
635 | int size, union i2c_smbus_data *data) | |
636 | { | |
637 | struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; | |
638 | struct hid_device *hdev = dev->hdev; | |
639 | u8 buf[64]; | |
29e2d6d1 | 640 | __le16 word; |
0438ee70 | 641 | ssize_t count; |
e932d817 DB |
642 | size_t read_length = 0; |
643 | unsigned int retries; | |
644 | int ret; | |
645 | ||
646 | hid_dbg(hdev, "%s addr 0x%x flags 0x%x cmd 0x%x size %d\n", | |
647 | read_write == I2C_SMBUS_WRITE ? "write" : "read", | |
648 | addr, flags, command, size); | |
649 | ||
650 | switch (size) { | |
651 | case I2C_SMBUS_BYTE: | |
652 | read_length = 1; | |
653 | ||
654 | if (I2C_SMBUS_READ == read_write) | |
655 | count = cp2112_read_req(buf, addr, read_length); | |
656 | else | |
6d00d153 | 657 | count = cp2112_write_req(buf, addr, command, NULL, |
e932d817 DB |
658 | 0); |
659 | break; | |
660 | case I2C_SMBUS_BYTE_DATA: | |
661 | read_length = 1; | |
662 | ||
663 | if (I2C_SMBUS_READ == read_write) | |
664 | count = cp2112_write_read_req(buf, addr, read_length, | |
665 | command, NULL, 0); | |
666 | else | |
667 | count = cp2112_write_req(buf, addr, command, | |
668 | &data->byte, 1); | |
669 | break; | |
670 | case I2C_SMBUS_WORD_DATA: | |
671 | read_length = 2; | |
29e2d6d1 | 672 | word = cpu_to_le16(data->word); |
e932d817 DB |
673 | |
674 | if (I2C_SMBUS_READ == read_write) | |
675 | count = cp2112_write_read_req(buf, addr, read_length, | |
676 | command, NULL, 0); | |
677 | else | |
678 | count = cp2112_write_req(buf, addr, command, | |
679 | (u8 *)&word, 2); | |
680 | break; | |
681 | case I2C_SMBUS_PROC_CALL: | |
682 | size = I2C_SMBUS_WORD_DATA; | |
683 | read_write = I2C_SMBUS_READ; | |
684 | read_length = 2; | |
29e2d6d1 | 685 | word = cpu_to_le16(data->word); |
e932d817 DB |
686 | |
687 | count = cp2112_write_read_req(buf, addr, read_length, command, | |
688 | (u8 *)&word, 2); | |
689 | break; | |
690 | case I2C_SMBUS_I2C_BLOCK_DATA: | |
542134c0 ES |
691 | if (read_write == I2C_SMBUS_READ) { |
692 | read_length = data->block[0]; | |
693 | count = cp2112_write_read_req(buf, addr, read_length, | |
694 | command, NULL, 0); | |
695 | } else { | |
696 | count = cp2112_write_req(buf, addr, command, | |
697 | data->block + 1, | |
698 | data->block[0]); | |
699 | } | |
700 | break; | |
e932d817 DB |
701 | case I2C_SMBUS_BLOCK_DATA: |
702 | if (I2C_SMBUS_READ == read_write) { | |
703 | count = cp2112_write_read_req(buf, addr, | |
704 | I2C_SMBUS_BLOCK_MAX, | |
705 | command, NULL, 0); | |
706 | } else { | |
707 | count = cp2112_write_req(buf, addr, command, | |
708 | data->block, | |
709 | data->block[0] + 1); | |
710 | } | |
711 | break; | |
712 | case I2C_SMBUS_BLOCK_PROC_CALL: | |
713 | size = I2C_SMBUS_BLOCK_DATA; | |
714 | read_write = I2C_SMBUS_READ; | |
715 | ||
716 | count = cp2112_write_read_req(buf, addr, I2C_SMBUS_BLOCK_MAX, | |
717 | command, data->block, | |
718 | data->block[0] + 1); | |
719 | break; | |
720 | default: | |
721 | hid_warn(hdev, "Unsupported transaction %d\n", size); | |
722 | return -EOPNOTSUPP; | |
723 | } | |
724 | ||
725 | if (count < 0) | |
726 | return count; | |
727 | ||
728 | ret = hid_hw_power(hdev, PM_HINT_FULLON); | |
729 | if (ret < 0) { | |
730 | hid_err(hdev, "power management error: %d\n", ret); | |
731 | return ret; | |
732 | } | |
733 | ||
734 | ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); | |
735 | if (ret < 0) { | |
736 | hid_warn(hdev, "Error starting transaction: %d\n", ret); | |
737 | goto power_normal; | |
738 | } | |
739 | ||
740 | for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { | |
741 | ret = cp2112_xfer_status(dev); | |
742 | if (-EBUSY == ret) | |
743 | continue; | |
744 | if (ret < 0) | |
745 | goto power_normal; | |
746 | break; | |
747 | } | |
748 | ||
749 | if (XFER_STATUS_RETRIES <= retries) { | |
750 | hid_warn(hdev, "Transfer timed out, cancelling.\n"); | |
751 | buf[0] = CP2112_CANCEL_TRANSFER; | |
752 | buf[1] = 0x01; | |
753 | ||
754 | ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); | |
755 | if (ret < 0) | |
756 | hid_warn(hdev, "Error cancelling transaction: %d\n", | |
757 | ret); | |
758 | ||
759 | ret = -ETIMEDOUT; | |
760 | goto power_normal; | |
761 | } | |
762 | ||
763 | if (I2C_SMBUS_WRITE == read_write) { | |
764 | ret = 0; | |
765 | goto power_normal; | |
766 | } | |
767 | ||
768 | if (I2C_SMBUS_BLOCK_DATA == size) | |
769 | read_length = ret; | |
770 | ||
771 | ret = cp2112_read(dev, buf, read_length); | |
772 | if (ret < 0) | |
773 | goto power_normal; | |
774 | if (ret != read_length) { | |
5a673fce | 775 | hid_warn(hdev, "short read: %d < %zd\n", ret, read_length); |
e932d817 DB |
776 | ret = -EIO; |
777 | goto power_normal; | |
778 | } | |
779 | ||
780 | switch (size) { | |
781 | case I2C_SMBUS_BYTE: | |
782 | case I2C_SMBUS_BYTE_DATA: | |
783 | data->byte = buf[0]; | |
784 | break; | |
785 | case I2C_SMBUS_WORD_DATA: | |
29e2d6d1 | 786 | data->word = le16_to_cpup((__le16 *)buf); |
e932d817 | 787 | break; |
542134c0 ES |
788 | case I2C_SMBUS_I2C_BLOCK_DATA: |
789 | memcpy(data->block + 1, buf, read_length); | |
790 | break; | |
e932d817 DB |
791 | case I2C_SMBUS_BLOCK_DATA: |
792 | if (read_length > I2C_SMBUS_BLOCK_MAX) { | |
793 | ret = -EPROTO; | |
794 | goto power_normal; | |
795 | } | |
796 | ||
797 | memcpy(data->block, buf, read_length); | |
798 | break; | |
799 | } | |
800 | ||
801 | ret = 0; | |
802 | power_normal: | |
803 | hid_hw_power(hdev, PM_HINT_NORMAL); | |
804 | hid_dbg(hdev, "transfer finished: %d\n", ret); | |
805 | return ret; | |
806 | } | |
807 | ||
808 | static u32 cp2112_functionality(struct i2c_adapter *adap) | |
809 | { | |
b9029345 AB |
810 | return I2C_FUNC_I2C | |
811 | I2C_FUNC_SMBUS_BYTE | | |
e932d817 DB |
812 | I2C_FUNC_SMBUS_BYTE_DATA | |
813 | I2C_FUNC_SMBUS_WORD_DATA | | |
814 | I2C_FUNC_SMBUS_BLOCK_DATA | | |
815 | I2C_FUNC_SMBUS_I2C_BLOCK | | |
816 | I2C_FUNC_SMBUS_PROC_CALL | | |
817 | I2C_FUNC_SMBUS_BLOCK_PROC_CALL; | |
818 | } | |
819 | ||
820 | static const struct i2c_algorithm smbus_algorithm = { | |
b9029345 | 821 | .master_xfer = cp2112_i2c_xfer, |
e932d817 DB |
822 | .smbus_xfer = cp2112_xfer, |
823 | .functionality = cp2112_functionality, | |
824 | }; | |
825 | ||
826 | static int cp2112_get_usb_config(struct hid_device *hdev, | |
827 | struct cp2112_usb_config_report *cfg) | |
828 | { | |
829 | int ret; | |
830 | ||
831 | ret = cp2112_hid_get(hdev, CP2112_USB_CONFIG, (u8 *)cfg, sizeof(*cfg), | |
832 | HID_FEATURE_REPORT); | |
833 | if (ret != sizeof(*cfg)) { | |
834 | hid_err(hdev, "error reading usb config: %d\n", ret); | |
835 | if (ret < 0) | |
836 | return ret; | |
837 | return -EIO; | |
838 | } | |
839 | ||
840 | return 0; | |
841 | } | |
842 | ||
843 | static int cp2112_set_usb_config(struct hid_device *hdev, | |
844 | struct cp2112_usb_config_report *cfg) | |
845 | { | |
846 | int ret; | |
847 | ||
848 | BUG_ON(cfg->report != CP2112_USB_CONFIG); | |
849 | ||
850 | ret = cp2112_hid_output(hdev, (u8 *)cfg, sizeof(*cfg), | |
851 | HID_FEATURE_REPORT); | |
852 | if (ret != sizeof(*cfg)) { | |
853 | hid_err(hdev, "error writing usb config: %d\n", ret); | |
854 | if (ret < 0) | |
855 | return ret; | |
856 | return -EIO; | |
857 | } | |
858 | ||
859 | return 0; | |
860 | } | |
861 | ||
862 | static void chmod_sysfs_attrs(struct hid_device *hdev); | |
863 | ||
864 | #define CP2112_CONFIG_ATTR(name, store, format, ...) \ | |
865 | static ssize_t name##_store(struct device *kdev, \ | |
866 | struct device_attribute *attr, const char *buf, \ | |
867 | size_t count) \ | |
868 | { \ | |
ee79a8f8 | 869 | struct hid_device *hdev = to_hid_device(kdev); \ |
e932d817 DB |
870 | struct cp2112_usb_config_report cfg; \ |
871 | int ret = cp2112_get_usb_config(hdev, &cfg); \ | |
872 | if (ret) \ | |
873 | return ret; \ | |
874 | store; \ | |
875 | ret = cp2112_set_usb_config(hdev, &cfg); \ | |
876 | if (ret) \ | |
877 | return ret; \ | |
878 | chmod_sysfs_attrs(hdev); \ | |
879 | return count; \ | |
880 | } \ | |
881 | static ssize_t name##_show(struct device *kdev, \ | |
882 | struct device_attribute *attr, char *buf) \ | |
883 | { \ | |
ee79a8f8 | 884 | struct hid_device *hdev = to_hid_device(kdev); \ |
e932d817 DB |
885 | struct cp2112_usb_config_report cfg; \ |
886 | int ret = cp2112_get_usb_config(hdev, &cfg); \ | |
887 | if (ret) \ | |
888 | return ret; \ | |
889 | return scnprintf(buf, PAGE_SIZE, format, ##__VA_ARGS__); \ | |
890 | } \ | |
c3c041ba | 891 | static DEVICE_ATTR_RW(name); |
e932d817 DB |
892 | |
893 | CP2112_CONFIG_ATTR(vendor_id, ({ | |
894 | u16 vid; | |
895 | ||
896 | if (sscanf(buf, "%hi", &vid) != 1) | |
897 | return -EINVAL; | |
898 | ||
899 | cfg.vid = cpu_to_le16(vid); | |
900 | cfg.mask = 0x01; | |
901 | }), "0x%04x\n", le16_to_cpu(cfg.vid)); | |
902 | ||
903 | CP2112_CONFIG_ATTR(product_id, ({ | |
904 | u16 pid; | |
905 | ||
906 | if (sscanf(buf, "%hi", &pid) != 1) | |
907 | return -EINVAL; | |
908 | ||
909 | cfg.pid = cpu_to_le16(pid); | |
910 | cfg.mask = 0x02; | |
911 | }), "0x%04x\n", le16_to_cpu(cfg.pid)); | |
912 | ||
913 | CP2112_CONFIG_ATTR(max_power, ({ | |
914 | int mA; | |
915 | ||
916 | if (sscanf(buf, "%i", &mA) != 1) | |
917 | return -EINVAL; | |
918 | ||
919 | cfg.max_power = (mA + 1) / 2; | |
920 | cfg.mask = 0x04; | |
921 | }), "%u mA\n", cfg.max_power * 2); | |
922 | ||
923 | CP2112_CONFIG_ATTR(power_mode, ({ | |
924 | if (sscanf(buf, "%hhi", &cfg.power_mode) != 1) | |
925 | return -EINVAL; | |
926 | ||
927 | cfg.mask = 0x08; | |
928 | }), "%u\n", cfg.power_mode); | |
929 | ||
930 | CP2112_CONFIG_ATTR(release_version, ({ | |
931 | if (sscanf(buf, "%hhi.%hhi", &cfg.release_major, &cfg.release_minor) | |
932 | != 2) | |
933 | return -EINVAL; | |
934 | ||
935 | cfg.mask = 0x10; | |
936 | }), "%u.%u\n", cfg.release_major, cfg.release_minor); | |
937 | ||
938 | #undef CP2112_CONFIG_ATTR | |
939 | ||
940 | struct cp2112_pstring_attribute { | |
941 | struct device_attribute attr; | |
942 | unsigned char report; | |
943 | }; | |
944 | ||
945 | static ssize_t pstr_store(struct device *kdev, | |
946 | struct device_attribute *kattr, const char *buf, | |
947 | size_t count) | |
948 | { | |
ee79a8f8 | 949 | struct hid_device *hdev = to_hid_device(kdev); |
e932d817 DB |
950 | struct cp2112_pstring_attribute *attr = |
951 | container_of(kattr, struct cp2112_pstring_attribute, attr); | |
952 | struct cp2112_string_report report; | |
953 | int ret; | |
954 | ||
955 | memset(&report, 0, sizeof(report)); | |
956 | ||
957 | ret = utf8s_to_utf16s(buf, count, UTF16_LITTLE_ENDIAN, | |
958 | report.string, ARRAY_SIZE(report.string)); | |
959 | report.report = attr->report; | |
960 | report.length = ret * sizeof(report.string[0]) + 2; | |
961 | report.type = USB_DT_STRING; | |
962 | ||
963 | ret = cp2112_hid_output(hdev, &report.report, report.length + 1, | |
964 | HID_FEATURE_REPORT); | |
965 | if (ret != report.length + 1) { | |
966 | hid_err(hdev, "error writing %s string: %d\n", kattr->attr.name, | |
967 | ret); | |
968 | if (ret < 0) | |
969 | return ret; | |
970 | return -EIO; | |
971 | } | |
972 | ||
973 | chmod_sysfs_attrs(hdev); | |
974 | return count; | |
975 | } | |
976 | ||
977 | static ssize_t pstr_show(struct device *kdev, | |
978 | struct device_attribute *kattr, char *buf) | |
979 | { | |
ee79a8f8 | 980 | struct hid_device *hdev = to_hid_device(kdev); |
e932d817 DB |
981 | struct cp2112_pstring_attribute *attr = |
982 | container_of(kattr, struct cp2112_pstring_attribute, attr); | |
983 | struct cp2112_string_report report; | |
984 | u8 length; | |
985 | int ret; | |
986 | ||
987 | ret = cp2112_hid_get(hdev, attr->report, &report.report, | |
988 | sizeof(report) - 1, HID_FEATURE_REPORT); | |
989 | if (ret < 3) { | |
990 | hid_err(hdev, "error reading %s string: %d\n", kattr->attr.name, | |
991 | ret); | |
992 | if (ret < 0) | |
993 | return ret; | |
994 | return -EIO; | |
995 | } | |
996 | ||
997 | if (report.length < 2) { | |
998 | hid_err(hdev, "invalid %s string length: %d\n", | |
999 | kattr->attr.name, report.length); | |
1000 | return -EIO; | |
1001 | } | |
1002 | ||
1003 | length = report.length > ret - 1 ? ret - 1 : report.length; | |
1004 | length = (length - 2) / sizeof(report.string[0]); | |
1005 | ret = utf16s_to_utf8s(report.string, length, UTF16_LITTLE_ENDIAN, buf, | |
1006 | PAGE_SIZE - 1); | |
1007 | buf[ret++] = '\n'; | |
1008 | return ret; | |
1009 | } | |
1010 | ||
1011 | #define CP2112_PSTR_ATTR(name, _report) \ | |
c3c041ba | 1012 | static struct cp2112_pstring_attribute dev_attr_##name = { \ |
e932d817 DB |
1013 | .attr = __ATTR(name, (S_IWUSR | S_IRUGO), pstr_show, pstr_store), \ |
1014 | .report = _report, \ | |
1015 | }; | |
1016 | ||
1017 | CP2112_PSTR_ATTR(manufacturer, CP2112_MANUFACTURER_STRING); | |
1018 | CP2112_PSTR_ATTR(product, CP2112_PRODUCT_STRING); | |
1019 | CP2112_PSTR_ATTR(serial, CP2112_SERIAL_STRING); | |
1020 | ||
1021 | #undef CP2112_PSTR_ATTR | |
1022 | ||
1023 | static const struct attribute_group cp2112_attr_group = { | |
1024 | .attrs = (struct attribute *[]){ | |
1025 | &dev_attr_vendor_id.attr, | |
1026 | &dev_attr_product_id.attr, | |
1027 | &dev_attr_max_power.attr, | |
1028 | &dev_attr_power_mode.attr, | |
1029 | &dev_attr_release_version.attr, | |
1030 | &dev_attr_manufacturer.attr.attr, | |
1031 | &dev_attr_product.attr.attr, | |
1032 | &dev_attr_serial.attr.attr, | |
1033 | NULL | |
1034 | } | |
1035 | }; | |
1036 | ||
1037 | /* Chmoding our sysfs attributes is simply a way to expose which fields in the | |
1038 | * PROM have already been programmed. We do not depend on this preventing | |
1039 | * writing to these attributes since the CP2112 will simply ignore writes to | |
1040 | * already-programmed fields. This is why there is no sense in fixing this | |
1041 | * racy behaviour. | |
1042 | */ | |
1043 | static void chmod_sysfs_attrs(struct hid_device *hdev) | |
1044 | { | |
1045 | struct attribute **attr; | |
1046 | u8 buf[2]; | |
1047 | int ret; | |
1048 | ||
1049 | ret = cp2112_hid_get(hdev, CP2112_LOCK_BYTE, buf, sizeof(buf), | |
1050 | HID_FEATURE_REPORT); | |
1051 | if (ret != sizeof(buf)) { | |
1052 | hid_err(hdev, "error reading lock byte: %d\n", ret); | |
1053 | return; | |
1054 | } | |
1055 | ||
1056 | for (attr = cp2112_attr_group.attrs; *attr; ++attr) { | |
1057 | umode_t mode = (buf[1] & 1) ? S_IWUSR | S_IRUGO : S_IRUGO; | |
1058 | ret = sysfs_chmod_file(&hdev->dev.kobj, *attr, mode); | |
1059 | if (ret < 0) | |
1060 | hid_err(hdev, "error chmoding sysfs file %s\n", | |
1061 | (*attr)->name); | |
1062 | buf[1] >>= 1; | |
1063 | } | |
1064 | } | |
1065 | ||
13de9cca BT |
1066 | static void cp2112_gpio_irq_ack(struct irq_data *d) |
1067 | { | |
1068 | } | |
1069 | ||
1070 | static void cp2112_gpio_irq_mask(struct irq_data *d) | |
1071 | { | |
1072 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d); | |
1073 | struct cp2112_device *dev = gpiochip_get_data(gc); | |
1074 | ||
1075 | __clear_bit(d->hwirq, &dev->irq_mask); | |
1076 | } | |
1077 | ||
1078 | static void cp2112_gpio_irq_unmask(struct irq_data *d) | |
1079 | { | |
1080 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d); | |
1081 | struct cp2112_device *dev = gpiochip_get_data(gc); | |
1082 | ||
1083 | __set_bit(d->hwirq, &dev->irq_mask); | |
1084 | } | |
1085 | ||
1086 | static void cp2112_gpio_poll_callback(struct work_struct *work) | |
1087 | { | |
1088 | struct cp2112_device *dev = container_of(work, struct cp2112_device, | |
1089 | gpio_poll_worker.work); | |
1090 | struct irq_data *d; | |
1091 | u8 gpio_mask; | |
1092 | u8 virqs = (u8)dev->irq_mask; | |
1093 | u32 irq_type; | |
1094 | int irq, virq, ret; | |
1095 | ||
1096 | ret = cp2112_gpio_get_all(&dev->gc); | |
1097 | if (ret == -ENODEV) /* the hardware has been disconnected */ | |
1098 | return; | |
1099 | if (ret < 0) | |
1100 | goto exit; | |
1101 | ||
1102 | gpio_mask = ret; | |
1103 | ||
1104 | while (virqs) { | |
1105 | virq = ffs(virqs) - 1; | |
1106 | virqs &= ~BIT(virq); | |
1107 | ||
1108 | if (!dev->gc.to_irq) | |
1109 | break; | |
1110 | ||
1111 | irq = dev->gc.to_irq(&dev->gc, virq); | |
1112 | ||
1113 | d = irq_get_irq_data(irq); | |
1114 | if (!d) | |
1115 | continue; | |
1116 | ||
1117 | irq_type = irqd_get_trigger_type(d); | |
1118 | ||
1119 | if (gpio_mask & BIT(virq)) { | |
1120 | /* Level High */ | |
1121 | ||
1122 | if (irq_type & IRQ_TYPE_LEVEL_HIGH) | |
1123 | handle_nested_irq(irq); | |
1124 | ||
1125 | if ((irq_type & IRQ_TYPE_EDGE_RISING) && | |
1126 | !(dev->gpio_prev_state & BIT(virq))) | |
1127 | handle_nested_irq(irq); | |
1128 | } else { | |
1129 | /* Level Low */ | |
1130 | ||
1131 | if (irq_type & IRQ_TYPE_LEVEL_LOW) | |
1132 | handle_nested_irq(irq); | |
1133 | ||
1134 | if ((irq_type & IRQ_TYPE_EDGE_FALLING) && | |
1135 | (dev->gpio_prev_state & BIT(virq))) | |
1136 | handle_nested_irq(irq); | |
1137 | } | |
1138 | } | |
1139 | ||
1140 | dev->gpio_prev_state = gpio_mask; | |
1141 | ||
1142 | exit: | |
1143 | if (dev->gpio_poll) | |
1144 | schedule_delayed_work(&dev->gpio_poll_worker, 10); | |
1145 | } | |
1146 | ||
1147 | ||
1148 | static unsigned int cp2112_gpio_irq_startup(struct irq_data *d) | |
1149 | { | |
1150 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d); | |
1151 | struct cp2112_device *dev = gpiochip_get_data(gc); | |
1152 | ||
1153 | INIT_DELAYED_WORK(&dev->gpio_poll_worker, cp2112_gpio_poll_callback); | |
1154 | ||
1155 | cp2112_gpio_direction_input(gc, d->hwirq); | |
1156 | ||
1157 | if (!dev->gpio_poll) { | |
1158 | dev->gpio_poll = true; | |
1159 | schedule_delayed_work(&dev->gpio_poll_worker, 0); | |
1160 | } | |
1161 | ||
1162 | cp2112_gpio_irq_unmask(d); | |
1163 | return 0; | |
1164 | } | |
1165 | ||
1166 | static void cp2112_gpio_irq_shutdown(struct irq_data *d) | |
1167 | { | |
1168 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d); | |
1169 | struct cp2112_device *dev = gpiochip_get_data(gc); | |
1170 | ||
1171 | cancel_delayed_work_sync(&dev->gpio_poll_worker); | |
1172 | } | |
1173 | ||
1174 | static int cp2112_gpio_irq_type(struct irq_data *d, unsigned int type) | |
1175 | { | |
1176 | return 0; | |
1177 | } | |
1178 | ||
1179 | static struct irq_chip cp2112_gpio_irqchip = { | |
1180 | .name = "cp2112-gpio", | |
1181 | .irq_startup = cp2112_gpio_irq_startup, | |
1182 | .irq_shutdown = cp2112_gpio_irq_shutdown, | |
1183 | .irq_ack = cp2112_gpio_irq_ack, | |
1184 | .irq_mask = cp2112_gpio_irq_mask, | |
1185 | .irq_unmask = cp2112_gpio_irq_unmask, | |
1186 | .irq_set_type = cp2112_gpio_irq_type, | |
1187 | }; | |
1188 | ||
1189 | static int __maybe_unused cp2112_allocate_irq(struct cp2112_device *dev, | |
1190 | int pin) | |
1191 | { | |
1192 | int ret; | |
1193 | ||
1194 | if (dev->desc[pin]) | |
1195 | return -EINVAL; | |
1196 | ||
1197 | dev->desc[pin] = gpiochip_request_own_desc(&dev->gc, pin, | |
21abf103 | 1198 | "HID/I2C:Event", 0); |
13de9cca BT |
1199 | if (IS_ERR(dev->desc[pin])) { |
1200 | dev_err(dev->gc.parent, "Failed to request GPIO\n"); | |
1201 | return PTR_ERR(dev->desc[pin]); | |
1202 | } | |
1203 | ||
1204 | ret = gpiochip_lock_as_irq(&dev->gc, pin); | |
1205 | if (ret) { | |
1206 | dev_err(dev->gc.parent, "Failed to lock GPIO as interrupt\n"); | |
1207 | goto err_desc; | |
1208 | } | |
1209 | ||
1210 | ret = gpiod_to_irq(dev->desc[pin]); | |
1211 | if (ret < 0) { | |
1212 | dev_err(dev->gc.parent, "Failed to translate GPIO to IRQ\n"); | |
1213 | goto err_lock; | |
1214 | } | |
1215 | ||
1216 | return ret; | |
1217 | ||
1218 | err_lock: | |
1219 | gpiochip_unlock_as_irq(&dev->gc, pin); | |
1220 | err_desc: | |
1221 | gpiochip_free_own_desc(dev->desc[pin]); | |
1222 | dev->desc[pin] = NULL; | |
1223 | return ret; | |
1224 | } | |
1225 | ||
e932d817 DB |
1226 | static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id) |
1227 | { | |
1228 | struct cp2112_device *dev; | |
1229 | u8 buf[3]; | |
1230 | struct cp2112_smbus_config_report config; | |
1231 | int ret; | |
1232 | ||
1ffb3c40 BT |
1233 | dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL); |
1234 | if (!dev) | |
1235 | return -ENOMEM; | |
1236 | ||
1237 | dev->in_out_buffer = devm_kzalloc(&hdev->dev, CP2112_REPORT_MAX_LENGTH, | |
1238 | GFP_KERNEL); | |
1239 | if (!dev->in_out_buffer) | |
1240 | return -ENOMEM; | |
1241 | ||
7a7b5df8 | 1242 | mutex_init(&dev->lock); |
1ffb3c40 | 1243 | |
e932d817 DB |
1244 | ret = hid_parse(hdev); |
1245 | if (ret) { | |
1246 | hid_err(hdev, "parse failed\n"); | |
1247 | return ret; | |
1248 | } | |
1249 | ||
1250 | ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW); | |
1251 | if (ret) { | |
1252 | hid_err(hdev, "hw start failed\n"); | |
1253 | return ret; | |
1254 | } | |
1255 | ||
1256 | ret = hid_hw_open(hdev); | |
1257 | if (ret) { | |
1258 | hid_err(hdev, "hw open failed\n"); | |
1259 | goto err_hid_stop; | |
1260 | } | |
1261 | ||
1262 | ret = hid_hw_power(hdev, PM_HINT_FULLON); | |
1263 | if (ret < 0) { | |
1264 | hid_err(hdev, "power management error: %d\n", ret); | |
1265 | goto err_hid_close; | |
1266 | } | |
1267 | ||
1268 | ret = cp2112_hid_get(hdev, CP2112_GET_VERSION_INFO, buf, sizeof(buf), | |
1269 | HID_FEATURE_REPORT); | |
1270 | if (ret != sizeof(buf)) { | |
1271 | hid_err(hdev, "error requesting version\n"); | |
1272 | if (ret >= 0) | |
1273 | ret = -EIO; | |
1274 | goto err_power_normal; | |
1275 | } | |
1276 | ||
1277 | hid_info(hdev, "Part Number: 0x%02X Device Version: 0x%02X\n", | |
1278 | buf[1], buf[2]); | |
1279 | ||
1280 | ret = cp2112_hid_get(hdev, CP2112_SMBUS_CONFIG, (u8 *)&config, | |
1281 | sizeof(config), HID_FEATURE_REPORT); | |
1282 | if (ret != sizeof(config)) { | |
1283 | hid_err(hdev, "error requesting SMBus config\n"); | |
1284 | if (ret >= 0) | |
1285 | ret = -EIO; | |
1286 | goto err_power_normal; | |
1287 | } | |
1288 | ||
1289 | config.retry_time = cpu_to_be16(1); | |
1290 | ||
1291 | ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config), | |
1292 | HID_FEATURE_REPORT); | |
1293 | if (ret != sizeof(config)) { | |
1294 | hid_err(hdev, "error setting SMBus config\n"); | |
1295 | if (ret >= 0) | |
1296 | ret = -EIO; | |
1297 | goto err_power_normal; | |
1298 | } | |
1299 | ||
e932d817 DB |
1300 | hid_set_drvdata(hdev, (void *)dev); |
1301 | dev->hdev = hdev; | |
1302 | dev->adap.owner = THIS_MODULE; | |
1303 | dev->adap.class = I2C_CLASS_HWMON; | |
1304 | dev->adap.algo = &smbus_algorithm; | |
1305 | dev->adap.algo_data = dev; | |
1306 | dev->adap.dev.parent = &hdev->dev; | |
1307 | snprintf(dev->adap.name, sizeof(dev->adap.name), | |
42cb6b35 JK |
1308 | "CP2112 SMBus Bridge on hidraw%d", |
1309 | ((struct hidraw *)hdev->hidraw)->minor); | |
44eda784 | 1310 | dev->hwversion = buf[2]; |
e932d817 DB |
1311 | init_waitqueue_head(&dev->wait); |
1312 | ||
1313 | hid_device_io_start(hdev); | |
1314 | ret = i2c_add_adapter(&dev->adap); | |
1315 | hid_device_io_stop(hdev); | |
1316 | ||
1317 | if (ret) { | |
1318 | hid_err(hdev, "error registering i2c adapter\n"); | |
1ffb3c40 | 1319 | goto err_power_normal; |
e932d817 DB |
1320 | } |
1321 | ||
1322 | hid_dbg(hdev, "adapter registered\n"); | |
1323 | ||
1324 | dev->gc.label = "cp2112_gpio"; | |
1325 | dev->gc.direction_input = cp2112_gpio_direction_input; | |
1326 | dev->gc.direction_output = cp2112_gpio_direction_output; | |
1327 | dev->gc.set = cp2112_gpio_set; | |
1328 | dev->gc.get = cp2112_gpio_get; | |
1329 | dev->gc.base = -1; | |
1330 | dev->gc.ngpio = 8; | |
1331 | dev->gc.can_sleep = 1; | |
58383c78 | 1332 | dev->gc.parent = &hdev->dev; |
e932d817 | 1333 | |
47513c2f | 1334 | ret = gpiochip_add_data(&dev->gc, dev); |
e932d817 DB |
1335 | if (ret < 0) { |
1336 | hid_err(hdev, "error registering gpio chip\n"); | |
1337 | goto err_free_i2c; | |
1338 | } | |
1339 | ||
1340 | ret = sysfs_create_group(&hdev->dev.kobj, &cp2112_attr_group); | |
1341 | if (ret < 0) { | |
1342 | hid_err(hdev, "error creating sysfs attrs\n"); | |
1343 | goto err_gpiochip_remove; | |
1344 | } | |
1345 | ||
1346 | chmod_sysfs_attrs(hdev); | |
1347 | hid_hw_power(hdev, PM_HINT_NORMAL); | |
1348 | ||
13de9cca BT |
1349 | ret = gpiochip_irqchip_add(&dev->gc, &cp2112_gpio_irqchip, 0, |
1350 | handle_simple_irq, IRQ_TYPE_NONE); | |
1351 | if (ret) { | |
1352 | dev_err(dev->gc.parent, "failed to add IRQ chip\n"); | |
1353 | goto err_sysfs_remove; | |
1354 | } | |
1355 | ||
e932d817 DB |
1356 | return ret; |
1357 | ||
13de9cca BT |
1358 | err_sysfs_remove: |
1359 | sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group); | |
e932d817 | 1360 | err_gpiochip_remove: |
88d5e520 | 1361 | gpiochip_remove(&dev->gc); |
e932d817 DB |
1362 | err_free_i2c: |
1363 | i2c_del_adapter(&dev->adap); | |
e932d817 DB |
1364 | err_power_normal: |
1365 | hid_hw_power(hdev, PM_HINT_NORMAL); | |
1366 | err_hid_close: | |
1367 | hid_hw_close(hdev); | |
1368 | err_hid_stop: | |
1369 | hid_hw_stop(hdev); | |
1370 | return ret; | |
1371 | } | |
1372 | ||
1373 | static void cp2112_remove(struct hid_device *hdev) | |
1374 | { | |
1375 | struct cp2112_device *dev = hid_get_drvdata(hdev); | |
13de9cca | 1376 | int i; |
e932d817 DB |
1377 | |
1378 | sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group); | |
e932d817 | 1379 | i2c_del_adapter(&dev->adap); |
13de9cca BT |
1380 | |
1381 | if (dev->gpio_poll) { | |
1382 | dev->gpio_poll = false; | |
1383 | cancel_delayed_work_sync(&dev->gpio_poll_worker); | |
1384 | } | |
1385 | ||
1386 | for (i = 0; i < ARRAY_SIZE(dev->desc); i++) { | |
1387 | gpiochip_unlock_as_irq(&dev->gc, i); | |
1388 | gpiochip_free_own_desc(dev->desc[i]); | |
1389 | } | |
1390 | ||
1391 | gpiochip_remove(&dev->gc); | |
e932d817 DB |
1392 | /* i2c_del_adapter has finished removing all i2c devices from our |
1393 | * adapter. Well behaved devices should no longer call our cp2112_xfer | |
1394 | * and should have waited for any pending calls to finish. It has also | |
1395 | * waited for device_unregister(&adap->dev) to complete. Therefore we | |
1396 | * can safely free our struct cp2112_device. | |
1397 | */ | |
1398 | hid_hw_close(hdev); | |
1399 | hid_hw_stop(hdev); | |
e932d817 DB |
1400 | } |
1401 | ||
1402 | static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report, | |
1403 | u8 *data, int size) | |
1404 | { | |
1405 | struct cp2112_device *dev = hid_get_drvdata(hdev); | |
1406 | struct cp2112_xfer_status_report *xfer = (void *)data; | |
1407 | ||
1408 | switch (data[0]) { | |
1409 | case CP2112_TRANSFER_STATUS_RESPONSE: | |
1410 | hid_dbg(hdev, "xfer status: %02x %02x %04x %04x\n", | |
1411 | xfer->status0, xfer->status1, | |
1412 | be16_to_cpu(xfer->retries), be16_to_cpu(xfer->length)); | |
1413 | ||
1414 | switch (xfer->status0) { | |
1415 | case STATUS0_IDLE: | |
1416 | dev->xfer_status = -EAGAIN; | |
1417 | break; | |
1418 | case STATUS0_BUSY: | |
1419 | dev->xfer_status = -EBUSY; | |
1420 | break; | |
1421 | case STATUS0_COMPLETE: | |
1422 | dev->xfer_status = be16_to_cpu(xfer->length); | |
1423 | break; | |
1424 | case STATUS0_ERROR: | |
1425 | switch (xfer->status1) { | |
1426 | case STATUS1_TIMEOUT_NACK: | |
1427 | case STATUS1_TIMEOUT_BUS: | |
1428 | dev->xfer_status = -ETIMEDOUT; | |
1429 | break; | |
1430 | default: | |
1431 | dev->xfer_status = -EIO; | |
1432 | break; | |
1433 | } | |
1434 | break; | |
1435 | default: | |
1436 | dev->xfer_status = -EINVAL; | |
1437 | break; | |
1438 | } | |
1439 | ||
1440 | atomic_set(&dev->xfer_avail, 1); | |
1441 | break; | |
1442 | case CP2112_DATA_READ_RESPONSE: | |
1443 | hid_dbg(hdev, "read response: %02x %02x\n", data[1], data[2]); | |
1444 | ||
1445 | dev->read_length = data[2]; | |
1446 | if (dev->read_length > sizeof(dev->read_data)) | |
1447 | dev->read_length = sizeof(dev->read_data); | |
1448 | ||
1449 | memcpy(dev->read_data, &data[3], dev->read_length); | |
1450 | atomic_set(&dev->read_avail, 1); | |
1451 | break; | |
1452 | default: | |
1453 | hid_err(hdev, "unknown report\n"); | |
1454 | ||
1455 | return 0; | |
1456 | } | |
1457 | ||
1458 | wake_up_interruptible(&dev->wait); | |
1459 | return 1; | |
1460 | } | |
1461 | ||
1462 | static struct hid_driver cp2112_driver = { | |
1463 | .name = "cp2112", | |
1464 | .id_table = cp2112_devices, | |
1465 | .probe = cp2112_probe, | |
1466 | .remove = cp2112_remove, | |
1467 | .raw_event = cp2112_raw_event, | |
1468 | }; | |
1469 | ||
1470 | module_hid_driver(cp2112_driver); | |
1471 | MODULE_DESCRIPTION("Silicon Labs HID USB to SMBus master bridge"); | |
1472 | MODULE_AUTHOR("David Barksdale <dbarksdale@uplogix.com>"); | |
1473 | MODULE_LICENSE("GPL"); | |
1474 |