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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 | ||
5923ea6c LW |
19 | #include <linux/gpio/consumer.h> |
20 | #include <linux/gpio/machine.h> | |
47513c2f | 21 | #include <linux/gpio/driver.h> |
e932d817 | 22 | #include <linux/hid.h> |
42cb6b35 | 23 | #include <linux/hidraw.h> |
e932d817 DB |
24 | #include <linux/i2c.h> |
25 | #include <linux/module.h> | |
26 | #include <linux/nls.h> | |
27 | #include <linux/usb/ch9.h> | |
28 | #include "hid-ids.h" | |
29 | ||
1ffb3c40 BT |
30 | #define CP2112_REPORT_MAX_LENGTH 64 |
31 | #define CP2112_GPIO_CONFIG_LENGTH 5 | |
32 | #define CP2112_GPIO_GET_LENGTH 2 | |
33 | #define CP2112_GPIO_SET_LENGTH 3 | |
34 | ||
e932d817 DB |
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; | |
1ffb3c40 | 164 | u8 *in_out_buffer; |
7a7b5df8 | 165 | struct mutex lock; |
13de9cca BT |
166 | |
167 | struct gpio_desc *desc[8]; | |
168 | bool gpio_poll; | |
169 | struct delayed_work gpio_poll_worker; | |
170 | unsigned long irq_mask; | |
171 | u8 gpio_prev_state; | |
e932d817 DB |
172 | }; |
173 | ||
174 | static int gpio_push_pull = 0xFF; | |
175 | module_param(gpio_push_pull, int, S_IRUGO | S_IWUSR); | |
176 | MODULE_PARM_DESC(gpio_push_pull, "GPIO push-pull configuration bitmask"); | |
177 | ||
178 | static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset) | |
179 | { | |
47513c2f | 180 | struct cp2112_device *dev = gpiochip_get_data(chip); |
e932d817 | 181 | struct hid_device *hdev = dev->hdev; |
1ffb3c40 | 182 | u8 *buf = dev->in_out_buffer; |
e932d817 DB |
183 | int ret; |
184 | ||
7a7b5df8 | 185 | mutex_lock(&dev->lock); |
1ffb3c40 | 186 | |
490051ad | 187 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, |
1ffb3c40 BT |
188 | CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, |
189 | HID_REQ_GET_REPORT); | |
190 | if (ret != CP2112_GPIO_CONFIG_LENGTH) { | |
e932d817 | 191 | hid_err(hdev, "error requesting GPIO config: %d\n", ret); |
7da85fbf SS |
192 | if (ret >= 0) |
193 | ret = -EIO; | |
1ffb3c40 | 194 | goto exit; |
e932d817 DB |
195 | } |
196 | ||
197 | buf[1] &= ~(1 << offset); | |
198 | buf[2] = gpio_push_pull; | |
199 | ||
1ffb3c40 BT |
200 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, |
201 | CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, | |
202 | HID_REQ_SET_REPORT); | |
7da85fbf | 203 | if (ret != CP2112_GPIO_CONFIG_LENGTH) { |
e932d817 | 204 | hid_err(hdev, "error setting GPIO config: %d\n", ret); |
7da85fbf SS |
205 | if (ret >= 0) |
206 | ret = -EIO; | |
1ffb3c40 | 207 | goto exit; |
e932d817 DB |
208 | } |
209 | ||
1ffb3c40 BT |
210 | ret = 0; |
211 | ||
212 | exit: | |
7a7b5df8 | 213 | mutex_unlock(&dev->lock); |
7da85fbf | 214 | return ret; |
e932d817 DB |
215 | } |
216 | ||
217 | static void cp2112_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
218 | { | |
47513c2f | 219 | struct cp2112_device *dev = gpiochip_get_data(chip); |
e932d817 | 220 | struct hid_device *hdev = dev->hdev; |
1ffb3c40 | 221 | u8 *buf = dev->in_out_buffer; |
e932d817 DB |
222 | int ret; |
223 | ||
7a7b5df8 | 224 | mutex_lock(&dev->lock); |
1ffb3c40 | 225 | |
e932d817 DB |
226 | buf[0] = CP2112_GPIO_SET; |
227 | buf[1] = value ? 0xff : 0; | |
228 | buf[2] = 1 << offset; | |
229 | ||
1ffb3c40 BT |
230 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_SET, buf, |
231 | CP2112_GPIO_SET_LENGTH, HID_FEATURE_REPORT, | |
232 | HID_REQ_SET_REPORT); | |
e932d817 DB |
233 | if (ret < 0) |
234 | hid_err(hdev, "error setting GPIO values: %d\n", ret); | |
1ffb3c40 | 235 | |
7a7b5df8 | 236 | mutex_unlock(&dev->lock); |
e932d817 DB |
237 | } |
238 | ||
13de9cca | 239 | static int cp2112_gpio_get_all(struct gpio_chip *chip) |
e932d817 | 240 | { |
47513c2f | 241 | struct cp2112_device *dev = gpiochip_get_data(chip); |
e932d817 | 242 | struct hid_device *hdev = dev->hdev; |
1ffb3c40 | 243 | u8 *buf = dev->in_out_buffer; |
e932d817 DB |
244 | int ret; |
245 | ||
7a7b5df8 | 246 | mutex_lock(&dev->lock); |
1ffb3c40 BT |
247 | |
248 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_GET, buf, | |
249 | CP2112_GPIO_GET_LENGTH, HID_FEATURE_REPORT, | |
250 | HID_REQ_GET_REPORT); | |
251 | if (ret != CP2112_GPIO_GET_LENGTH) { | |
e932d817 | 252 | hid_err(hdev, "error requesting GPIO values: %d\n", ret); |
1ffb3c40 BT |
253 | ret = ret < 0 ? ret : -EIO; |
254 | goto exit; | |
e932d817 DB |
255 | } |
256 | ||
13de9cca | 257 | ret = buf[1]; |
1ffb3c40 BT |
258 | |
259 | exit: | |
7a7b5df8 | 260 | mutex_unlock(&dev->lock); |
1ffb3c40 BT |
261 | |
262 | return ret; | |
e932d817 DB |
263 | } |
264 | ||
13de9cca BT |
265 | static int cp2112_gpio_get(struct gpio_chip *chip, unsigned int offset) |
266 | { | |
267 | int ret; | |
268 | ||
269 | ret = cp2112_gpio_get_all(chip); | |
270 | if (ret < 0) | |
271 | return ret; | |
272 | ||
273 | return (ret >> offset) & 1; | |
274 | } | |
275 | ||
e932d817 DB |
276 | static int cp2112_gpio_direction_output(struct gpio_chip *chip, |
277 | unsigned offset, int value) | |
278 | { | |
47513c2f | 279 | struct cp2112_device *dev = gpiochip_get_data(chip); |
e932d817 | 280 | struct hid_device *hdev = dev->hdev; |
1ffb3c40 | 281 | u8 *buf = dev->in_out_buffer; |
e932d817 DB |
282 | int ret; |
283 | ||
7a7b5df8 | 284 | mutex_lock(&dev->lock); |
1ffb3c40 | 285 | |
490051ad | 286 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, |
1ffb3c40 BT |
287 | CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, |
288 | HID_REQ_GET_REPORT); | |
289 | if (ret != CP2112_GPIO_CONFIG_LENGTH) { | |
e932d817 | 290 | hid_err(hdev, "error requesting GPIO config: %d\n", ret); |
1ffb3c40 | 291 | goto fail; |
e932d817 DB |
292 | } |
293 | ||
294 | buf[1] |= 1 << offset; | |
295 | buf[2] = gpio_push_pull; | |
296 | ||
1ffb3c40 BT |
297 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, |
298 | CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, | |
299 | HID_REQ_SET_REPORT); | |
e932d817 DB |
300 | if (ret < 0) { |
301 | hid_err(hdev, "error setting GPIO config: %d\n", ret); | |
1ffb3c40 | 302 | goto fail; |
e932d817 DB |
303 | } |
304 | ||
7a7b5df8 | 305 | mutex_unlock(&dev->lock); |
1ffb3c40 | 306 | |
beb9d007 AB |
307 | /* |
308 | * Set gpio value when output direction is already set, | |
309 | * as specified in AN495, Rev. 0.2, cpt. 4.4 | |
310 | */ | |
311 | cp2112_gpio_set(chip, offset, value); | |
312 | ||
e932d817 | 313 | return 0; |
1ffb3c40 BT |
314 | |
315 | fail: | |
7a7b5df8 | 316 | mutex_unlock(&dev->lock); |
1ffb3c40 | 317 | return ret < 0 ? ret : -EIO; |
e932d817 DB |
318 | } |
319 | ||
320 | static int cp2112_hid_get(struct hid_device *hdev, unsigned char report_number, | |
321 | u8 *data, size_t count, unsigned char report_type) | |
322 | { | |
323 | u8 *buf; | |
324 | int ret; | |
325 | ||
326 | buf = kmalloc(count, GFP_KERNEL); | |
327 | if (!buf) | |
328 | return -ENOMEM; | |
329 | ||
490051ad JK |
330 | ret = hid_hw_raw_request(hdev, report_number, buf, count, |
331 | report_type, HID_REQ_GET_REPORT); | |
e932d817 DB |
332 | memcpy(data, buf, count); |
333 | kfree(buf); | |
334 | return ret; | |
335 | } | |
336 | ||
337 | static int cp2112_hid_output(struct hid_device *hdev, u8 *data, size_t count, | |
338 | unsigned char report_type) | |
339 | { | |
340 | u8 *buf; | |
341 | int ret; | |
342 | ||
343 | buf = kmemdup(data, count, GFP_KERNEL); | |
344 | if (!buf) | |
345 | return -ENOMEM; | |
346 | ||
866e4797 BT |
347 | if (report_type == HID_OUTPUT_REPORT) |
348 | ret = hid_hw_output_report(hdev, buf, count); | |
349 | else | |
350 | ret = hid_hw_raw_request(hdev, buf[0], buf, count, report_type, | |
351 | HID_REQ_SET_REPORT); | |
352 | ||
e932d817 DB |
353 | kfree(buf); |
354 | return ret; | |
355 | } | |
356 | ||
357 | static int cp2112_wait(struct cp2112_device *dev, atomic_t *avail) | |
358 | { | |
359 | int ret = 0; | |
360 | ||
361 | /* We have sent either a CP2112_TRANSFER_STATUS_REQUEST or a | |
362 | * CP2112_DATA_READ_FORCE_SEND and we are waiting for the response to | |
363 | * come in cp2112_raw_event or timeout. There will only be one of these | |
364 | * in flight at any one time. The timeout is extremely large and is a | |
365 | * last resort if the CP2112 has died. If we do timeout we don't expect | |
366 | * to receive the response which would cause data races, it's not like | |
367 | * we can do anything about it anyway. | |
368 | */ | |
369 | ret = wait_event_interruptible_timeout(dev->wait, | |
370 | atomic_read(avail), msecs_to_jiffies(RESPONSE_TIMEOUT)); | |
371 | if (-ERESTARTSYS == ret) | |
372 | return ret; | |
373 | if (!ret) | |
374 | return -ETIMEDOUT; | |
375 | ||
376 | atomic_set(avail, 0); | |
377 | return 0; | |
378 | } | |
379 | ||
380 | static int cp2112_xfer_status(struct cp2112_device *dev) | |
381 | { | |
382 | struct hid_device *hdev = dev->hdev; | |
383 | u8 buf[2]; | |
384 | int ret; | |
385 | ||
386 | buf[0] = CP2112_TRANSFER_STATUS_REQUEST; | |
387 | buf[1] = 0x01; | |
388 | atomic_set(&dev->xfer_avail, 0); | |
389 | ||
390 | ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); | |
391 | if (ret < 0) { | |
392 | hid_warn(hdev, "Error requesting status: %d\n", ret); | |
393 | return ret; | |
394 | } | |
395 | ||
396 | ret = cp2112_wait(dev, &dev->xfer_avail); | |
397 | if (ret) | |
398 | return ret; | |
399 | ||
400 | return dev->xfer_status; | |
401 | } | |
402 | ||
403 | static int cp2112_read(struct cp2112_device *dev, u8 *data, size_t size) | |
404 | { | |
405 | struct hid_device *hdev = dev->hdev; | |
406 | struct cp2112_force_read_report report; | |
407 | int ret; | |
408 | ||
6debce6f AB |
409 | if (size > sizeof(dev->read_data)) |
410 | size = sizeof(dev->read_data); | |
e932d817 DB |
411 | report.report = CP2112_DATA_READ_FORCE_SEND; |
412 | report.length = cpu_to_be16(size); | |
413 | ||
414 | atomic_set(&dev->read_avail, 0); | |
415 | ||
416 | ret = cp2112_hid_output(hdev, &report.report, sizeof(report), | |
417 | HID_OUTPUT_REPORT); | |
418 | if (ret < 0) { | |
419 | hid_warn(hdev, "Error requesting data: %d\n", ret); | |
420 | return ret; | |
421 | } | |
422 | ||
423 | ret = cp2112_wait(dev, &dev->read_avail); | |
424 | if (ret) | |
425 | return ret; | |
426 | ||
5a673fce | 427 | hid_dbg(hdev, "read %d of %zd bytes requested\n", |
e932d817 DB |
428 | dev->read_length, size); |
429 | ||
430 | if (size > dev->read_length) | |
431 | size = dev->read_length; | |
432 | ||
433 | memcpy(data, dev->read_data, size); | |
434 | return dev->read_length; | |
435 | } | |
436 | ||
437 | static int cp2112_read_req(void *buf, u8 slave_address, u16 length) | |
438 | { | |
439 | struct cp2112_read_req_report *report = buf; | |
440 | ||
441 | if (length < 1 || length > 512) | |
442 | return -EINVAL; | |
443 | ||
444 | report->report = CP2112_DATA_READ_REQUEST; | |
445 | report->slave_address = slave_address << 1; | |
446 | report->length = cpu_to_be16(length); | |
447 | return sizeof(*report); | |
448 | } | |
449 | ||
450 | static int cp2112_write_read_req(void *buf, u8 slave_address, u16 length, | |
451 | u8 command, u8 *data, u8 data_length) | |
452 | { | |
453 | struct cp2112_write_read_req_report *report = buf; | |
454 | ||
455 | if (length < 1 || length > 512 | |
456 | || data_length > sizeof(report->target_address) - 1) | |
457 | return -EINVAL; | |
458 | ||
459 | report->report = CP2112_DATA_WRITE_READ_REQUEST; | |
460 | report->slave_address = slave_address << 1; | |
461 | report->length = cpu_to_be16(length); | |
462 | report->target_address_length = data_length + 1; | |
463 | report->target_address[0] = command; | |
464 | memcpy(&report->target_address[1], data, data_length); | |
465 | return data_length + 6; | |
466 | } | |
467 | ||
468 | static int cp2112_write_req(void *buf, u8 slave_address, u8 command, u8 *data, | |
469 | u8 data_length) | |
470 | { | |
471 | struct cp2112_write_req_report *report = buf; | |
472 | ||
473 | if (data_length > sizeof(report->data) - 1) | |
474 | return -EINVAL; | |
475 | ||
476 | report->report = CP2112_DATA_WRITE_REQUEST; | |
477 | report->slave_address = slave_address << 1; | |
478 | report->length = data_length + 1; | |
479 | report->data[0] = command; | |
480 | memcpy(&report->data[1], data, data_length); | |
481 | return data_length + 4; | |
482 | } | |
483 | ||
b9029345 AB |
484 | static int cp2112_i2c_write_req(void *buf, u8 slave_address, u8 *data, |
485 | u8 data_length) | |
486 | { | |
487 | struct cp2112_write_req_report *report = buf; | |
488 | ||
489 | if (data_length > sizeof(report->data)) | |
490 | return -EINVAL; | |
491 | ||
492 | report->report = CP2112_DATA_WRITE_REQUEST; | |
493 | report->slave_address = slave_address << 1; | |
494 | report->length = data_length; | |
495 | memcpy(report->data, data, data_length); | |
496 | return data_length + 3; | |
497 | } | |
498 | ||
44eda784 EW |
499 | static int cp2112_i2c_write_read_req(void *buf, u8 slave_address, |
500 | u8 *addr, int addr_length, | |
501 | int read_length) | |
502 | { | |
503 | struct cp2112_write_read_req_report *report = buf; | |
504 | ||
505 | if (read_length < 1 || read_length > 512 || | |
506 | addr_length > sizeof(report->target_address)) | |
507 | return -EINVAL; | |
508 | ||
509 | report->report = CP2112_DATA_WRITE_READ_REQUEST; | |
510 | report->slave_address = slave_address << 1; | |
511 | report->length = cpu_to_be16(read_length); | |
512 | report->target_address_length = addr_length; | |
513 | memcpy(report->target_address, addr, addr_length); | |
514 | return addr_length + 5; | |
515 | } | |
516 | ||
b9029345 AB |
517 | static int cp2112_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, |
518 | int num) | |
519 | { | |
520 | struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; | |
521 | struct hid_device *hdev = dev->hdev; | |
522 | u8 buf[64]; | |
523 | ssize_t count; | |
44eda784 EW |
524 | ssize_t read_length = 0; |
525 | u8 *read_buf = NULL; | |
b9029345 AB |
526 | unsigned int retries; |
527 | int ret; | |
528 | ||
529 | hid_dbg(hdev, "I2C %d messages\n", num); | |
530 | ||
44eda784 EW |
531 | if (num == 1) { |
532 | if (msgs->flags & I2C_M_RD) { | |
533 | hid_dbg(hdev, "I2C read %#04x len %d\n", | |
534 | msgs->addr, msgs->len); | |
535 | read_length = msgs->len; | |
536 | read_buf = msgs->buf; | |
537 | count = cp2112_read_req(buf, msgs->addr, msgs->len); | |
538 | } else { | |
539 | hid_dbg(hdev, "I2C write %#04x len %d\n", | |
540 | msgs->addr, msgs->len); | |
541 | count = cp2112_i2c_write_req(buf, msgs->addr, | |
542 | msgs->buf, msgs->len); | |
543 | } | |
544 | if (count < 0) | |
545 | return count; | |
546 | } else if (dev->hwversion > 1 && /* no repeated start in rev 1 */ | |
547 | num == 2 && | |
548 | msgs[0].addr == msgs[1].addr && | |
549 | !(msgs[0].flags & I2C_M_RD) && (msgs[1].flags & I2C_M_RD)) { | |
550 | hid_dbg(hdev, "I2C write-read %#04x wlen %d rlen %d\n", | |
551 | msgs[0].addr, msgs[0].len, msgs[1].len); | |
552 | read_length = msgs[1].len; | |
553 | read_buf = msgs[1].buf; | |
554 | count = cp2112_i2c_write_read_req(buf, msgs[0].addr, | |
555 | msgs[0].buf, msgs[0].len, msgs[1].len); | |
556 | if (count < 0) | |
557 | return count; | |
558 | } else { | |
b9029345 AB |
559 | hid_err(hdev, |
560 | "Multi-message I2C transactions not supported\n"); | |
561 | return -EOPNOTSUPP; | |
562 | } | |
563 | ||
b9029345 AB |
564 | ret = hid_hw_power(hdev, PM_HINT_FULLON); |
565 | if (ret < 0) { | |
566 | hid_err(hdev, "power management error: %d\n", ret); | |
567 | return ret; | |
568 | } | |
569 | ||
570 | ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); | |
571 | if (ret < 0) { | |
572 | hid_warn(hdev, "Error starting transaction: %d\n", ret); | |
573 | goto power_normal; | |
574 | } | |
575 | ||
576 | for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { | |
577 | ret = cp2112_xfer_status(dev); | |
578 | if (-EBUSY == ret) | |
579 | continue; | |
580 | if (ret < 0) | |
581 | goto power_normal; | |
582 | break; | |
583 | } | |
584 | ||
585 | if (XFER_STATUS_RETRIES <= retries) { | |
586 | hid_warn(hdev, "Transfer timed out, cancelling.\n"); | |
587 | buf[0] = CP2112_CANCEL_TRANSFER; | |
588 | buf[1] = 0x01; | |
589 | ||
590 | ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); | |
591 | if (ret < 0) | |
592 | hid_warn(hdev, "Error cancelling transaction: %d\n", | |
593 | ret); | |
594 | ||
595 | ret = -ETIMEDOUT; | |
596 | goto power_normal; | |
597 | } | |
598 | ||
44eda784 EW |
599 | for (count = 0; count < read_length;) { |
600 | ret = cp2112_read(dev, read_buf + count, read_length - count); | |
5ddfb12e EW |
601 | if (ret < 0) |
602 | goto power_normal; | |
603 | if (ret == 0) { | |
604 | hid_err(hdev, "read returned 0\n"); | |
605 | ret = -EIO; | |
606 | goto power_normal; | |
607 | } | |
608 | count += ret; | |
44eda784 | 609 | if (count > read_length) { |
5ddfb12e EW |
610 | /* |
611 | * The hardware returned too much data. | |
612 | * This is mostly harmless because cp2112_read() | |
613 | * has a limit check so didn't overrun our | |
614 | * buffer. Nevertheless, we return an error | |
615 | * because something is seriously wrong and | |
616 | * it shouldn't go unnoticed. | |
617 | */ | |
618 | hid_err(hdev, "long read: %d > %zd\n", | |
44eda784 | 619 | ret, read_length - count + ret); |
5ddfb12e EW |
620 | ret = -EIO; |
621 | goto power_normal; | |
622 | } | |
b9029345 AB |
623 | } |
624 | ||
b9029345 | 625 | /* return the number of transferred messages */ |
44eda784 | 626 | ret = num; |
b9029345 AB |
627 | |
628 | power_normal: | |
629 | hid_hw_power(hdev, PM_HINT_NORMAL); | |
630 | hid_dbg(hdev, "I2C transfer finished: %d\n", ret); | |
631 | return ret; | |
632 | } | |
633 | ||
e932d817 DB |
634 | static int cp2112_xfer(struct i2c_adapter *adap, u16 addr, |
635 | unsigned short flags, char read_write, u8 command, | |
636 | int size, union i2c_smbus_data *data) | |
637 | { | |
638 | struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; | |
639 | struct hid_device *hdev = dev->hdev; | |
640 | u8 buf[64]; | |
29e2d6d1 | 641 | __le16 word; |
0438ee70 | 642 | ssize_t count; |
e932d817 DB |
643 | size_t read_length = 0; |
644 | unsigned int retries; | |
645 | int ret; | |
646 | ||
647 | hid_dbg(hdev, "%s addr 0x%x flags 0x%x cmd 0x%x size %d\n", | |
648 | read_write == I2C_SMBUS_WRITE ? "write" : "read", | |
649 | addr, flags, command, size); | |
650 | ||
651 | switch (size) { | |
652 | case I2C_SMBUS_BYTE: | |
653 | read_length = 1; | |
654 | ||
655 | if (I2C_SMBUS_READ == read_write) | |
656 | count = cp2112_read_req(buf, addr, read_length); | |
657 | else | |
6d00d153 | 658 | count = cp2112_write_req(buf, addr, command, NULL, |
e932d817 DB |
659 | 0); |
660 | break; | |
661 | case I2C_SMBUS_BYTE_DATA: | |
662 | read_length = 1; | |
663 | ||
664 | if (I2C_SMBUS_READ == read_write) | |
665 | count = cp2112_write_read_req(buf, addr, read_length, | |
666 | command, NULL, 0); | |
667 | else | |
668 | count = cp2112_write_req(buf, addr, command, | |
669 | &data->byte, 1); | |
670 | break; | |
671 | case I2C_SMBUS_WORD_DATA: | |
672 | read_length = 2; | |
29e2d6d1 | 673 | word = cpu_to_le16(data->word); |
e932d817 DB |
674 | |
675 | if (I2C_SMBUS_READ == read_write) | |
676 | count = cp2112_write_read_req(buf, addr, read_length, | |
677 | command, NULL, 0); | |
678 | else | |
679 | count = cp2112_write_req(buf, addr, command, | |
680 | (u8 *)&word, 2); | |
681 | break; | |
682 | case I2C_SMBUS_PROC_CALL: | |
683 | size = I2C_SMBUS_WORD_DATA; | |
684 | read_write = I2C_SMBUS_READ; | |
685 | read_length = 2; | |
29e2d6d1 | 686 | word = cpu_to_le16(data->word); |
e932d817 DB |
687 | |
688 | count = cp2112_write_read_req(buf, addr, read_length, command, | |
689 | (u8 *)&word, 2); | |
690 | break; | |
691 | case I2C_SMBUS_I2C_BLOCK_DATA: | |
542134c0 ES |
692 | if (read_write == I2C_SMBUS_READ) { |
693 | read_length = data->block[0]; | |
694 | count = cp2112_write_read_req(buf, addr, read_length, | |
695 | command, NULL, 0); | |
696 | } else { | |
697 | count = cp2112_write_req(buf, addr, command, | |
698 | data->block + 1, | |
699 | data->block[0]); | |
700 | } | |
701 | break; | |
e932d817 DB |
702 | case I2C_SMBUS_BLOCK_DATA: |
703 | if (I2C_SMBUS_READ == read_write) { | |
704 | count = cp2112_write_read_req(buf, addr, | |
705 | I2C_SMBUS_BLOCK_MAX, | |
706 | command, NULL, 0); | |
707 | } else { | |
708 | count = cp2112_write_req(buf, addr, command, | |
709 | data->block, | |
710 | data->block[0] + 1); | |
711 | } | |
712 | break; | |
713 | case I2C_SMBUS_BLOCK_PROC_CALL: | |
714 | size = I2C_SMBUS_BLOCK_DATA; | |
715 | read_write = I2C_SMBUS_READ; | |
716 | ||
717 | count = cp2112_write_read_req(buf, addr, I2C_SMBUS_BLOCK_MAX, | |
718 | command, data->block, | |
719 | data->block[0] + 1); | |
720 | break; | |
721 | default: | |
722 | hid_warn(hdev, "Unsupported transaction %d\n", size); | |
723 | return -EOPNOTSUPP; | |
724 | } | |
725 | ||
726 | if (count < 0) | |
727 | return count; | |
728 | ||
729 | ret = hid_hw_power(hdev, PM_HINT_FULLON); | |
730 | if (ret < 0) { | |
731 | hid_err(hdev, "power management error: %d\n", ret); | |
732 | return ret; | |
733 | } | |
734 | ||
735 | ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); | |
736 | if (ret < 0) { | |
737 | hid_warn(hdev, "Error starting transaction: %d\n", ret); | |
738 | goto power_normal; | |
739 | } | |
740 | ||
741 | for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { | |
742 | ret = cp2112_xfer_status(dev); | |
743 | if (-EBUSY == ret) | |
744 | continue; | |
745 | if (ret < 0) | |
746 | goto power_normal; | |
747 | break; | |
748 | } | |
749 | ||
750 | if (XFER_STATUS_RETRIES <= retries) { | |
751 | hid_warn(hdev, "Transfer timed out, cancelling.\n"); | |
752 | buf[0] = CP2112_CANCEL_TRANSFER; | |
753 | buf[1] = 0x01; | |
754 | ||
755 | ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); | |
756 | if (ret < 0) | |
757 | hid_warn(hdev, "Error cancelling transaction: %d\n", | |
758 | ret); | |
759 | ||
760 | ret = -ETIMEDOUT; | |
761 | goto power_normal; | |
762 | } | |
763 | ||
764 | if (I2C_SMBUS_WRITE == read_write) { | |
765 | ret = 0; | |
766 | goto power_normal; | |
767 | } | |
768 | ||
769 | if (I2C_SMBUS_BLOCK_DATA == size) | |
770 | read_length = ret; | |
771 | ||
772 | ret = cp2112_read(dev, buf, read_length); | |
773 | if (ret < 0) | |
774 | goto power_normal; | |
775 | if (ret != read_length) { | |
5a673fce | 776 | hid_warn(hdev, "short read: %d < %zd\n", ret, read_length); |
e932d817 DB |
777 | ret = -EIO; |
778 | goto power_normal; | |
779 | } | |
780 | ||
781 | switch (size) { | |
782 | case I2C_SMBUS_BYTE: | |
783 | case I2C_SMBUS_BYTE_DATA: | |
784 | data->byte = buf[0]; | |
785 | break; | |
786 | case I2C_SMBUS_WORD_DATA: | |
29e2d6d1 | 787 | data->word = le16_to_cpup((__le16 *)buf); |
e932d817 | 788 | break; |
542134c0 ES |
789 | case I2C_SMBUS_I2C_BLOCK_DATA: |
790 | memcpy(data->block + 1, buf, read_length); | |
791 | break; | |
e932d817 DB |
792 | case I2C_SMBUS_BLOCK_DATA: |
793 | if (read_length > I2C_SMBUS_BLOCK_MAX) { | |
794 | ret = -EPROTO; | |
795 | goto power_normal; | |
796 | } | |
797 | ||
798 | memcpy(data->block, buf, read_length); | |
799 | break; | |
800 | } | |
801 | ||
802 | ret = 0; | |
803 | power_normal: | |
804 | hid_hw_power(hdev, PM_HINT_NORMAL); | |
805 | hid_dbg(hdev, "transfer finished: %d\n", ret); | |
806 | return ret; | |
807 | } | |
808 | ||
809 | static u32 cp2112_functionality(struct i2c_adapter *adap) | |
810 | { | |
b9029345 AB |
811 | return I2C_FUNC_I2C | |
812 | I2C_FUNC_SMBUS_BYTE | | |
e932d817 DB |
813 | I2C_FUNC_SMBUS_BYTE_DATA | |
814 | I2C_FUNC_SMBUS_WORD_DATA | | |
815 | I2C_FUNC_SMBUS_BLOCK_DATA | | |
816 | I2C_FUNC_SMBUS_I2C_BLOCK | | |
817 | I2C_FUNC_SMBUS_PROC_CALL | | |
818 | I2C_FUNC_SMBUS_BLOCK_PROC_CALL; | |
819 | } | |
820 | ||
821 | static const struct i2c_algorithm smbus_algorithm = { | |
b9029345 | 822 | .master_xfer = cp2112_i2c_xfer, |
e932d817 DB |
823 | .smbus_xfer = cp2112_xfer, |
824 | .functionality = cp2112_functionality, | |
825 | }; | |
826 | ||
827 | static int cp2112_get_usb_config(struct hid_device *hdev, | |
828 | struct cp2112_usb_config_report *cfg) | |
829 | { | |
830 | int ret; | |
831 | ||
832 | ret = cp2112_hid_get(hdev, CP2112_USB_CONFIG, (u8 *)cfg, sizeof(*cfg), | |
833 | HID_FEATURE_REPORT); | |
834 | if (ret != sizeof(*cfg)) { | |
835 | hid_err(hdev, "error reading usb config: %d\n", ret); | |
836 | if (ret < 0) | |
837 | return ret; | |
838 | return -EIO; | |
839 | } | |
840 | ||
841 | return 0; | |
842 | } | |
843 | ||
844 | static int cp2112_set_usb_config(struct hid_device *hdev, | |
845 | struct cp2112_usb_config_report *cfg) | |
846 | { | |
847 | int ret; | |
848 | ||
849 | BUG_ON(cfg->report != CP2112_USB_CONFIG); | |
850 | ||
851 | ret = cp2112_hid_output(hdev, (u8 *)cfg, sizeof(*cfg), | |
852 | HID_FEATURE_REPORT); | |
853 | if (ret != sizeof(*cfg)) { | |
854 | hid_err(hdev, "error writing usb config: %d\n", ret); | |
855 | if (ret < 0) | |
856 | return ret; | |
857 | return -EIO; | |
858 | } | |
859 | ||
860 | return 0; | |
861 | } | |
862 | ||
863 | static void chmod_sysfs_attrs(struct hid_device *hdev); | |
864 | ||
865 | #define CP2112_CONFIG_ATTR(name, store, format, ...) \ | |
866 | static ssize_t name##_store(struct device *kdev, \ | |
867 | struct device_attribute *attr, const char *buf, \ | |
868 | size_t count) \ | |
869 | { \ | |
ee79a8f8 | 870 | struct hid_device *hdev = to_hid_device(kdev); \ |
e932d817 DB |
871 | struct cp2112_usb_config_report cfg; \ |
872 | int ret = cp2112_get_usb_config(hdev, &cfg); \ | |
873 | if (ret) \ | |
874 | return ret; \ | |
875 | store; \ | |
876 | ret = cp2112_set_usb_config(hdev, &cfg); \ | |
877 | if (ret) \ | |
878 | return ret; \ | |
879 | chmod_sysfs_attrs(hdev); \ | |
880 | return count; \ | |
881 | } \ | |
882 | static ssize_t name##_show(struct device *kdev, \ | |
883 | struct device_attribute *attr, char *buf) \ | |
884 | { \ | |
ee79a8f8 | 885 | struct hid_device *hdev = to_hid_device(kdev); \ |
e932d817 DB |
886 | struct cp2112_usb_config_report cfg; \ |
887 | int ret = cp2112_get_usb_config(hdev, &cfg); \ | |
888 | if (ret) \ | |
889 | return ret; \ | |
890 | return scnprintf(buf, PAGE_SIZE, format, ##__VA_ARGS__); \ | |
891 | } \ | |
c3c041ba | 892 | static DEVICE_ATTR_RW(name); |
e932d817 DB |
893 | |
894 | CP2112_CONFIG_ATTR(vendor_id, ({ | |
895 | u16 vid; | |
896 | ||
897 | if (sscanf(buf, "%hi", &vid) != 1) | |
898 | return -EINVAL; | |
899 | ||
900 | cfg.vid = cpu_to_le16(vid); | |
901 | cfg.mask = 0x01; | |
902 | }), "0x%04x\n", le16_to_cpu(cfg.vid)); | |
903 | ||
904 | CP2112_CONFIG_ATTR(product_id, ({ | |
905 | u16 pid; | |
906 | ||
907 | if (sscanf(buf, "%hi", &pid) != 1) | |
908 | return -EINVAL; | |
909 | ||
910 | cfg.pid = cpu_to_le16(pid); | |
911 | cfg.mask = 0x02; | |
912 | }), "0x%04x\n", le16_to_cpu(cfg.pid)); | |
913 | ||
914 | CP2112_CONFIG_ATTR(max_power, ({ | |
915 | int mA; | |
916 | ||
917 | if (sscanf(buf, "%i", &mA) != 1) | |
918 | return -EINVAL; | |
919 | ||
920 | cfg.max_power = (mA + 1) / 2; | |
921 | cfg.mask = 0x04; | |
922 | }), "%u mA\n", cfg.max_power * 2); | |
923 | ||
924 | CP2112_CONFIG_ATTR(power_mode, ({ | |
925 | if (sscanf(buf, "%hhi", &cfg.power_mode) != 1) | |
926 | return -EINVAL; | |
927 | ||
928 | cfg.mask = 0x08; | |
929 | }), "%u\n", cfg.power_mode); | |
930 | ||
931 | CP2112_CONFIG_ATTR(release_version, ({ | |
932 | if (sscanf(buf, "%hhi.%hhi", &cfg.release_major, &cfg.release_minor) | |
933 | != 2) | |
934 | return -EINVAL; | |
935 | ||
936 | cfg.mask = 0x10; | |
937 | }), "%u.%u\n", cfg.release_major, cfg.release_minor); | |
938 | ||
939 | #undef CP2112_CONFIG_ATTR | |
940 | ||
941 | struct cp2112_pstring_attribute { | |
942 | struct device_attribute attr; | |
943 | unsigned char report; | |
944 | }; | |
945 | ||
946 | static ssize_t pstr_store(struct device *kdev, | |
947 | struct device_attribute *kattr, const char *buf, | |
948 | size_t count) | |
949 | { | |
ee79a8f8 | 950 | struct hid_device *hdev = to_hid_device(kdev); |
e932d817 DB |
951 | struct cp2112_pstring_attribute *attr = |
952 | container_of(kattr, struct cp2112_pstring_attribute, attr); | |
953 | struct cp2112_string_report report; | |
954 | int ret; | |
955 | ||
956 | memset(&report, 0, sizeof(report)); | |
957 | ||
958 | ret = utf8s_to_utf16s(buf, count, UTF16_LITTLE_ENDIAN, | |
959 | report.string, ARRAY_SIZE(report.string)); | |
960 | report.report = attr->report; | |
961 | report.length = ret * sizeof(report.string[0]) + 2; | |
962 | report.type = USB_DT_STRING; | |
963 | ||
964 | ret = cp2112_hid_output(hdev, &report.report, report.length + 1, | |
965 | HID_FEATURE_REPORT); | |
966 | if (ret != report.length + 1) { | |
967 | hid_err(hdev, "error writing %s string: %d\n", kattr->attr.name, | |
968 | ret); | |
969 | if (ret < 0) | |
970 | return ret; | |
971 | return -EIO; | |
972 | } | |
973 | ||
974 | chmod_sysfs_attrs(hdev); | |
975 | return count; | |
976 | } | |
977 | ||
978 | static ssize_t pstr_show(struct device *kdev, | |
979 | struct device_attribute *kattr, char *buf) | |
980 | { | |
ee79a8f8 | 981 | struct hid_device *hdev = to_hid_device(kdev); |
e932d817 DB |
982 | struct cp2112_pstring_attribute *attr = |
983 | container_of(kattr, struct cp2112_pstring_attribute, attr); | |
984 | struct cp2112_string_report report; | |
985 | u8 length; | |
986 | int ret; | |
987 | ||
988 | ret = cp2112_hid_get(hdev, attr->report, &report.report, | |
989 | sizeof(report) - 1, HID_FEATURE_REPORT); | |
990 | if (ret < 3) { | |
991 | hid_err(hdev, "error reading %s string: %d\n", kattr->attr.name, | |
992 | ret); | |
993 | if (ret < 0) | |
994 | return ret; | |
995 | return -EIO; | |
996 | } | |
997 | ||
998 | if (report.length < 2) { | |
999 | hid_err(hdev, "invalid %s string length: %d\n", | |
1000 | kattr->attr.name, report.length); | |
1001 | return -EIO; | |
1002 | } | |
1003 | ||
1004 | length = report.length > ret - 1 ? ret - 1 : report.length; | |
1005 | length = (length - 2) / sizeof(report.string[0]); | |
1006 | ret = utf16s_to_utf8s(report.string, length, UTF16_LITTLE_ENDIAN, buf, | |
1007 | PAGE_SIZE - 1); | |
1008 | buf[ret++] = '\n'; | |
1009 | return ret; | |
1010 | } | |
1011 | ||
1012 | #define CP2112_PSTR_ATTR(name, _report) \ | |
c3c041ba | 1013 | static struct cp2112_pstring_attribute dev_attr_##name = { \ |
e932d817 DB |
1014 | .attr = __ATTR(name, (S_IWUSR | S_IRUGO), pstr_show, pstr_store), \ |
1015 | .report = _report, \ | |
1016 | }; | |
1017 | ||
1018 | CP2112_PSTR_ATTR(manufacturer, CP2112_MANUFACTURER_STRING); | |
1019 | CP2112_PSTR_ATTR(product, CP2112_PRODUCT_STRING); | |
1020 | CP2112_PSTR_ATTR(serial, CP2112_SERIAL_STRING); | |
1021 | ||
1022 | #undef CP2112_PSTR_ATTR | |
1023 | ||
1024 | static const struct attribute_group cp2112_attr_group = { | |
1025 | .attrs = (struct attribute *[]){ | |
1026 | &dev_attr_vendor_id.attr, | |
1027 | &dev_attr_product_id.attr, | |
1028 | &dev_attr_max_power.attr, | |
1029 | &dev_attr_power_mode.attr, | |
1030 | &dev_attr_release_version.attr, | |
1031 | &dev_attr_manufacturer.attr.attr, | |
1032 | &dev_attr_product.attr.attr, | |
1033 | &dev_attr_serial.attr.attr, | |
1034 | NULL | |
1035 | } | |
1036 | }; | |
1037 | ||
1038 | /* Chmoding our sysfs attributes is simply a way to expose which fields in the | |
1039 | * PROM have already been programmed. We do not depend on this preventing | |
1040 | * writing to these attributes since the CP2112 will simply ignore writes to | |
1041 | * already-programmed fields. This is why there is no sense in fixing this | |
1042 | * racy behaviour. | |
1043 | */ | |
1044 | static void chmod_sysfs_attrs(struct hid_device *hdev) | |
1045 | { | |
1046 | struct attribute **attr; | |
1047 | u8 buf[2]; | |
1048 | int ret; | |
1049 | ||
1050 | ret = cp2112_hid_get(hdev, CP2112_LOCK_BYTE, buf, sizeof(buf), | |
1051 | HID_FEATURE_REPORT); | |
1052 | if (ret != sizeof(buf)) { | |
1053 | hid_err(hdev, "error reading lock byte: %d\n", ret); | |
1054 | return; | |
1055 | } | |
1056 | ||
1057 | for (attr = cp2112_attr_group.attrs; *attr; ++attr) { | |
1058 | umode_t mode = (buf[1] & 1) ? S_IWUSR | S_IRUGO : S_IRUGO; | |
1059 | ret = sysfs_chmod_file(&hdev->dev.kobj, *attr, mode); | |
1060 | if (ret < 0) | |
1061 | hid_err(hdev, "error chmoding sysfs file %s\n", | |
1062 | (*attr)->name); | |
1063 | buf[1] >>= 1; | |
1064 | } | |
1065 | } | |
1066 | ||
13de9cca BT |
1067 | static void cp2112_gpio_irq_ack(struct irq_data *d) |
1068 | { | |
1069 | } | |
1070 | ||
1071 | static void cp2112_gpio_irq_mask(struct irq_data *d) | |
1072 | { | |
1073 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d); | |
1074 | struct cp2112_device *dev = gpiochip_get_data(gc); | |
1075 | ||
1076 | __clear_bit(d->hwirq, &dev->irq_mask); | |
1077 | } | |
1078 | ||
1079 | static void cp2112_gpio_irq_unmask(struct irq_data *d) | |
1080 | { | |
1081 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d); | |
1082 | struct cp2112_device *dev = gpiochip_get_data(gc); | |
1083 | ||
1084 | __set_bit(d->hwirq, &dev->irq_mask); | |
1085 | } | |
1086 | ||
1087 | static void cp2112_gpio_poll_callback(struct work_struct *work) | |
1088 | { | |
1089 | struct cp2112_device *dev = container_of(work, struct cp2112_device, | |
1090 | gpio_poll_worker.work); | |
1091 | struct irq_data *d; | |
1092 | u8 gpio_mask; | |
1093 | u8 virqs = (u8)dev->irq_mask; | |
1094 | u32 irq_type; | |
1095 | int irq, virq, ret; | |
1096 | ||
1097 | ret = cp2112_gpio_get_all(&dev->gc); | |
1098 | if (ret == -ENODEV) /* the hardware has been disconnected */ | |
1099 | return; | |
1100 | if (ret < 0) | |
1101 | goto exit; | |
1102 | ||
1103 | gpio_mask = ret; | |
1104 | ||
1105 | while (virqs) { | |
1106 | virq = ffs(virqs) - 1; | |
1107 | virqs &= ~BIT(virq); | |
1108 | ||
1109 | if (!dev->gc.to_irq) | |
1110 | break; | |
1111 | ||
1112 | irq = dev->gc.to_irq(&dev->gc, virq); | |
1113 | ||
1114 | d = irq_get_irq_data(irq); | |
1115 | if (!d) | |
1116 | continue; | |
1117 | ||
1118 | irq_type = irqd_get_trigger_type(d); | |
1119 | ||
1120 | if (gpio_mask & BIT(virq)) { | |
1121 | /* Level High */ | |
1122 | ||
1123 | if (irq_type & IRQ_TYPE_LEVEL_HIGH) | |
1124 | handle_nested_irq(irq); | |
1125 | ||
1126 | if ((irq_type & IRQ_TYPE_EDGE_RISING) && | |
1127 | !(dev->gpio_prev_state & BIT(virq))) | |
1128 | handle_nested_irq(irq); | |
1129 | } else { | |
1130 | /* Level Low */ | |
1131 | ||
1132 | if (irq_type & IRQ_TYPE_LEVEL_LOW) | |
1133 | handle_nested_irq(irq); | |
1134 | ||
1135 | if ((irq_type & IRQ_TYPE_EDGE_FALLING) && | |
1136 | (dev->gpio_prev_state & BIT(virq))) | |
1137 | handle_nested_irq(irq); | |
1138 | } | |
1139 | } | |
1140 | ||
1141 | dev->gpio_prev_state = gpio_mask; | |
1142 | ||
1143 | exit: | |
1144 | if (dev->gpio_poll) | |
1145 | schedule_delayed_work(&dev->gpio_poll_worker, 10); | |
1146 | } | |
1147 | ||
1148 | ||
1149 | static unsigned int cp2112_gpio_irq_startup(struct irq_data *d) | |
1150 | { | |
1151 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d); | |
1152 | struct cp2112_device *dev = gpiochip_get_data(gc); | |
1153 | ||
1154 | INIT_DELAYED_WORK(&dev->gpio_poll_worker, cp2112_gpio_poll_callback); | |
1155 | ||
13de9cca BT |
1156 | if (!dev->gpio_poll) { |
1157 | dev->gpio_poll = true; | |
1158 | schedule_delayed_work(&dev->gpio_poll_worker, 0); | |
1159 | } | |
1160 | ||
1161 | cp2112_gpio_irq_unmask(d); | |
1162 | return 0; | |
1163 | } | |
1164 | ||
1165 | static void cp2112_gpio_irq_shutdown(struct irq_data *d) | |
1166 | { | |
1167 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d); | |
1168 | struct cp2112_device *dev = gpiochip_get_data(gc); | |
1169 | ||
1170 | cancel_delayed_work_sync(&dev->gpio_poll_worker); | |
1171 | } | |
1172 | ||
1173 | static int cp2112_gpio_irq_type(struct irq_data *d, unsigned int type) | |
1174 | { | |
1175 | return 0; | |
1176 | } | |
1177 | ||
1178 | static struct irq_chip cp2112_gpio_irqchip = { | |
1179 | .name = "cp2112-gpio", | |
1180 | .irq_startup = cp2112_gpio_irq_startup, | |
1181 | .irq_shutdown = cp2112_gpio_irq_shutdown, | |
1182 | .irq_ack = cp2112_gpio_irq_ack, | |
1183 | .irq_mask = cp2112_gpio_irq_mask, | |
1184 | .irq_unmask = cp2112_gpio_irq_unmask, | |
1185 | .irq_set_type = cp2112_gpio_irq_type, | |
1186 | }; | |
1187 | ||
1188 | static int __maybe_unused cp2112_allocate_irq(struct cp2112_device *dev, | |
1189 | int pin) | |
1190 | { | |
1191 | int ret; | |
1192 | ||
1193 | if (dev->desc[pin]) | |
1194 | return -EINVAL; | |
1195 | ||
1196 | dev->desc[pin] = gpiochip_request_own_desc(&dev->gc, pin, | |
5923ea6c LW |
1197 | "HID/I2C:Event", |
1198 | GPIO_ACTIVE_HIGH, | |
1199 | GPIOD_IN); | |
13de9cca BT |
1200 | if (IS_ERR(dev->desc[pin])) { |
1201 | dev_err(dev->gc.parent, "Failed to request GPIO\n"); | |
1202 | return PTR_ERR(dev->desc[pin]); | |
1203 | } | |
1204 | ||
2d05dba2 BT |
1205 | ret = cp2112_gpio_direction_input(&dev->gc, pin); |
1206 | if (ret < 0) { | |
1207 | dev_err(dev->gc.parent, "Failed to set GPIO to input dir\n"); | |
1208 | goto err_desc; | |
1209 | } | |
1210 | ||
13de9cca BT |
1211 | ret = gpiochip_lock_as_irq(&dev->gc, pin); |
1212 | if (ret) { | |
1213 | dev_err(dev->gc.parent, "Failed to lock GPIO as interrupt\n"); | |
1214 | goto err_desc; | |
1215 | } | |
1216 | ||
1217 | ret = gpiod_to_irq(dev->desc[pin]); | |
1218 | if (ret < 0) { | |
1219 | dev_err(dev->gc.parent, "Failed to translate GPIO to IRQ\n"); | |
1220 | goto err_lock; | |
1221 | } | |
1222 | ||
1223 | return ret; | |
1224 | ||
1225 | err_lock: | |
1226 | gpiochip_unlock_as_irq(&dev->gc, pin); | |
1227 | err_desc: | |
1228 | gpiochip_free_own_desc(dev->desc[pin]); | |
1229 | dev->desc[pin] = NULL; | |
1230 | return ret; | |
1231 | } | |
1232 | ||
e932d817 DB |
1233 | static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id) |
1234 | { | |
1235 | struct cp2112_device *dev; | |
1236 | u8 buf[3]; | |
1237 | struct cp2112_smbus_config_report config; | |
1238 | int ret; | |
1239 | ||
1ffb3c40 BT |
1240 | dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL); |
1241 | if (!dev) | |
1242 | return -ENOMEM; | |
1243 | ||
1244 | dev->in_out_buffer = devm_kzalloc(&hdev->dev, CP2112_REPORT_MAX_LENGTH, | |
1245 | GFP_KERNEL); | |
1246 | if (!dev->in_out_buffer) | |
1247 | return -ENOMEM; | |
1248 | ||
7a7b5df8 | 1249 | mutex_init(&dev->lock); |
1ffb3c40 | 1250 | |
e932d817 DB |
1251 | ret = hid_parse(hdev); |
1252 | if (ret) { | |
1253 | hid_err(hdev, "parse failed\n"); | |
1254 | return ret; | |
1255 | } | |
1256 | ||
1257 | ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW); | |
1258 | if (ret) { | |
1259 | hid_err(hdev, "hw start failed\n"); | |
1260 | return ret; | |
1261 | } | |
1262 | ||
1263 | ret = hid_hw_open(hdev); | |
1264 | if (ret) { | |
1265 | hid_err(hdev, "hw open failed\n"); | |
1266 | goto err_hid_stop; | |
1267 | } | |
1268 | ||
1269 | ret = hid_hw_power(hdev, PM_HINT_FULLON); | |
1270 | if (ret < 0) { | |
1271 | hid_err(hdev, "power management error: %d\n", ret); | |
1272 | goto err_hid_close; | |
1273 | } | |
1274 | ||
1275 | ret = cp2112_hid_get(hdev, CP2112_GET_VERSION_INFO, buf, sizeof(buf), | |
1276 | HID_FEATURE_REPORT); | |
1277 | if (ret != sizeof(buf)) { | |
1278 | hid_err(hdev, "error requesting version\n"); | |
1279 | if (ret >= 0) | |
1280 | ret = -EIO; | |
1281 | goto err_power_normal; | |
1282 | } | |
1283 | ||
1284 | hid_info(hdev, "Part Number: 0x%02X Device Version: 0x%02X\n", | |
1285 | buf[1], buf[2]); | |
1286 | ||
1287 | ret = cp2112_hid_get(hdev, CP2112_SMBUS_CONFIG, (u8 *)&config, | |
1288 | sizeof(config), HID_FEATURE_REPORT); | |
1289 | if (ret != sizeof(config)) { | |
1290 | hid_err(hdev, "error requesting SMBus config\n"); | |
1291 | if (ret >= 0) | |
1292 | ret = -EIO; | |
1293 | goto err_power_normal; | |
1294 | } | |
1295 | ||
1296 | config.retry_time = cpu_to_be16(1); | |
1297 | ||
1298 | ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config), | |
1299 | HID_FEATURE_REPORT); | |
1300 | if (ret != sizeof(config)) { | |
1301 | hid_err(hdev, "error setting SMBus config\n"); | |
1302 | if (ret >= 0) | |
1303 | ret = -EIO; | |
1304 | goto err_power_normal; | |
1305 | } | |
1306 | ||
e932d817 DB |
1307 | hid_set_drvdata(hdev, (void *)dev); |
1308 | dev->hdev = hdev; | |
1309 | dev->adap.owner = THIS_MODULE; | |
1310 | dev->adap.class = I2C_CLASS_HWMON; | |
1311 | dev->adap.algo = &smbus_algorithm; | |
1312 | dev->adap.algo_data = dev; | |
1313 | dev->adap.dev.parent = &hdev->dev; | |
1314 | snprintf(dev->adap.name, sizeof(dev->adap.name), | |
42cb6b35 JK |
1315 | "CP2112 SMBus Bridge on hidraw%d", |
1316 | ((struct hidraw *)hdev->hidraw)->minor); | |
44eda784 | 1317 | dev->hwversion = buf[2]; |
e932d817 DB |
1318 | init_waitqueue_head(&dev->wait); |
1319 | ||
1320 | hid_device_io_start(hdev); | |
1321 | ret = i2c_add_adapter(&dev->adap); | |
1322 | hid_device_io_stop(hdev); | |
1323 | ||
1324 | if (ret) { | |
1325 | hid_err(hdev, "error registering i2c adapter\n"); | |
1ffb3c40 | 1326 | goto err_power_normal; |
e932d817 DB |
1327 | } |
1328 | ||
1329 | hid_dbg(hdev, "adapter registered\n"); | |
1330 | ||
1331 | dev->gc.label = "cp2112_gpio"; | |
1332 | dev->gc.direction_input = cp2112_gpio_direction_input; | |
1333 | dev->gc.direction_output = cp2112_gpio_direction_output; | |
1334 | dev->gc.set = cp2112_gpio_set; | |
1335 | dev->gc.get = cp2112_gpio_get; | |
1336 | dev->gc.base = -1; | |
1337 | dev->gc.ngpio = 8; | |
1338 | dev->gc.can_sleep = 1; | |
58383c78 | 1339 | dev->gc.parent = &hdev->dev; |
e932d817 | 1340 | |
47513c2f | 1341 | ret = gpiochip_add_data(&dev->gc, dev); |
e932d817 DB |
1342 | if (ret < 0) { |
1343 | hid_err(hdev, "error registering gpio chip\n"); | |
1344 | goto err_free_i2c; | |
1345 | } | |
1346 | ||
1347 | ret = sysfs_create_group(&hdev->dev.kobj, &cp2112_attr_group); | |
1348 | if (ret < 0) { | |
1349 | hid_err(hdev, "error creating sysfs attrs\n"); | |
1350 | goto err_gpiochip_remove; | |
1351 | } | |
1352 | ||
1353 | chmod_sysfs_attrs(hdev); | |
1354 | hid_hw_power(hdev, PM_HINT_NORMAL); | |
1355 | ||
13de9cca BT |
1356 | ret = gpiochip_irqchip_add(&dev->gc, &cp2112_gpio_irqchip, 0, |
1357 | handle_simple_irq, IRQ_TYPE_NONE); | |
1358 | if (ret) { | |
1359 | dev_err(dev->gc.parent, "failed to add IRQ chip\n"); | |
1360 | goto err_sysfs_remove; | |
1361 | } | |
1362 | ||
e932d817 DB |
1363 | return ret; |
1364 | ||
13de9cca BT |
1365 | err_sysfs_remove: |
1366 | sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group); | |
e932d817 | 1367 | err_gpiochip_remove: |
88d5e520 | 1368 | gpiochip_remove(&dev->gc); |
e932d817 DB |
1369 | err_free_i2c: |
1370 | i2c_del_adapter(&dev->adap); | |
e932d817 DB |
1371 | err_power_normal: |
1372 | hid_hw_power(hdev, PM_HINT_NORMAL); | |
1373 | err_hid_close: | |
1374 | hid_hw_close(hdev); | |
1375 | err_hid_stop: | |
1376 | hid_hw_stop(hdev); | |
1377 | return ret; | |
1378 | } | |
1379 | ||
1380 | static void cp2112_remove(struct hid_device *hdev) | |
1381 | { | |
1382 | struct cp2112_device *dev = hid_get_drvdata(hdev); | |
13de9cca | 1383 | int i; |
e932d817 DB |
1384 | |
1385 | sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group); | |
e932d817 | 1386 | i2c_del_adapter(&dev->adap); |
13de9cca BT |
1387 | |
1388 | if (dev->gpio_poll) { | |
1389 | dev->gpio_poll = false; | |
1390 | cancel_delayed_work_sync(&dev->gpio_poll_worker); | |
1391 | } | |
1392 | ||
1393 | for (i = 0; i < ARRAY_SIZE(dev->desc); i++) { | |
1394 | gpiochip_unlock_as_irq(&dev->gc, i); | |
1395 | gpiochip_free_own_desc(dev->desc[i]); | |
1396 | } | |
1397 | ||
1398 | gpiochip_remove(&dev->gc); | |
e932d817 DB |
1399 | /* i2c_del_adapter has finished removing all i2c devices from our |
1400 | * adapter. Well behaved devices should no longer call our cp2112_xfer | |
1401 | * and should have waited for any pending calls to finish. It has also | |
1402 | * waited for device_unregister(&adap->dev) to complete. Therefore we | |
1403 | * can safely free our struct cp2112_device. | |
1404 | */ | |
1405 | hid_hw_close(hdev); | |
1406 | hid_hw_stop(hdev); | |
e932d817 DB |
1407 | } |
1408 | ||
1409 | static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report, | |
1410 | u8 *data, int size) | |
1411 | { | |
1412 | struct cp2112_device *dev = hid_get_drvdata(hdev); | |
1413 | struct cp2112_xfer_status_report *xfer = (void *)data; | |
1414 | ||
1415 | switch (data[0]) { | |
1416 | case CP2112_TRANSFER_STATUS_RESPONSE: | |
1417 | hid_dbg(hdev, "xfer status: %02x %02x %04x %04x\n", | |
1418 | xfer->status0, xfer->status1, | |
1419 | be16_to_cpu(xfer->retries), be16_to_cpu(xfer->length)); | |
1420 | ||
1421 | switch (xfer->status0) { | |
1422 | case STATUS0_IDLE: | |
1423 | dev->xfer_status = -EAGAIN; | |
1424 | break; | |
1425 | case STATUS0_BUSY: | |
1426 | dev->xfer_status = -EBUSY; | |
1427 | break; | |
1428 | case STATUS0_COMPLETE: | |
1429 | dev->xfer_status = be16_to_cpu(xfer->length); | |
1430 | break; | |
1431 | case STATUS0_ERROR: | |
1432 | switch (xfer->status1) { | |
1433 | case STATUS1_TIMEOUT_NACK: | |
1434 | case STATUS1_TIMEOUT_BUS: | |
1435 | dev->xfer_status = -ETIMEDOUT; | |
1436 | break; | |
1437 | default: | |
1438 | dev->xfer_status = -EIO; | |
1439 | break; | |
1440 | } | |
1441 | break; | |
1442 | default: | |
1443 | dev->xfer_status = -EINVAL; | |
1444 | break; | |
1445 | } | |
1446 | ||
1447 | atomic_set(&dev->xfer_avail, 1); | |
1448 | break; | |
1449 | case CP2112_DATA_READ_RESPONSE: | |
1450 | hid_dbg(hdev, "read response: %02x %02x\n", data[1], data[2]); | |
1451 | ||
1452 | dev->read_length = data[2]; | |
1453 | if (dev->read_length > sizeof(dev->read_data)) | |
1454 | dev->read_length = sizeof(dev->read_data); | |
1455 | ||
1456 | memcpy(dev->read_data, &data[3], dev->read_length); | |
1457 | atomic_set(&dev->read_avail, 1); | |
1458 | break; | |
1459 | default: | |
1460 | hid_err(hdev, "unknown report\n"); | |
1461 | ||
1462 | return 0; | |
1463 | } | |
1464 | ||
1465 | wake_up_interruptible(&dev->wait); | |
1466 | return 1; | |
1467 | } | |
1468 | ||
1469 | static struct hid_driver cp2112_driver = { | |
1470 | .name = "cp2112", | |
1471 | .id_table = cp2112_devices, | |
1472 | .probe = cp2112_probe, | |
1473 | .remove = cp2112_remove, | |
1474 | .raw_event = cp2112_raw_event, | |
1475 | }; | |
1476 | ||
1477 | module_hid_driver(cp2112_driver); | |
1478 | MODULE_DESCRIPTION("Silicon Labs HID USB to SMBus master bridge"); | |
1479 | MODULE_AUTHOR("David Barksdale <dbarksdale@uplogix.com>"); | |
1480 | MODULE_LICENSE("GPL"); | |
1481 |