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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: | |
b1631b84 | 14 | * https://www.silabs.com/Support%20Documents/TechnicalDocs/CP2112.pdf |
e932d817 | 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; | |
2a2b09c8 | 164 | struct irq_chip irq; |
1ffb3c40 | 165 | u8 *in_out_buffer; |
7a7b5df8 | 166 | struct mutex lock; |
13de9cca BT |
167 | |
168 | struct gpio_desc *desc[8]; | |
169 | bool gpio_poll; | |
170 | struct delayed_work gpio_poll_worker; | |
171 | unsigned long irq_mask; | |
172 | u8 gpio_prev_state; | |
e932d817 DB |
173 | }; |
174 | ||
175 | static int gpio_push_pull = 0xFF; | |
176 | module_param(gpio_push_pull, int, S_IRUGO | S_IWUSR); | |
177 | MODULE_PARM_DESC(gpio_push_pull, "GPIO push-pull configuration bitmask"); | |
178 | ||
179 | static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset) | |
180 | { | |
47513c2f | 181 | struct cp2112_device *dev = gpiochip_get_data(chip); |
e932d817 | 182 | struct hid_device *hdev = dev->hdev; |
1ffb3c40 | 183 | u8 *buf = dev->in_out_buffer; |
e932d817 DB |
184 | int ret; |
185 | ||
7a7b5df8 | 186 | mutex_lock(&dev->lock); |
1ffb3c40 | 187 | |
490051ad | 188 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, |
1ffb3c40 BT |
189 | CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, |
190 | HID_REQ_GET_REPORT); | |
191 | if (ret != CP2112_GPIO_CONFIG_LENGTH) { | |
e932d817 | 192 | hid_err(hdev, "error requesting GPIO config: %d\n", ret); |
7da85fbf SS |
193 | if (ret >= 0) |
194 | ret = -EIO; | |
1ffb3c40 | 195 | goto exit; |
e932d817 DB |
196 | } |
197 | ||
198 | buf[1] &= ~(1 << offset); | |
199 | buf[2] = gpio_push_pull; | |
200 | ||
1ffb3c40 BT |
201 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, |
202 | CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, | |
203 | HID_REQ_SET_REPORT); | |
7da85fbf | 204 | if (ret != CP2112_GPIO_CONFIG_LENGTH) { |
e932d817 | 205 | hid_err(hdev, "error setting GPIO config: %d\n", ret); |
7da85fbf SS |
206 | if (ret >= 0) |
207 | ret = -EIO; | |
1ffb3c40 | 208 | goto exit; |
e932d817 DB |
209 | } |
210 | ||
1ffb3c40 BT |
211 | ret = 0; |
212 | ||
213 | exit: | |
7a7b5df8 | 214 | mutex_unlock(&dev->lock); |
7da85fbf | 215 | return ret; |
e932d817 DB |
216 | } |
217 | ||
218 | static void cp2112_gpio_set(struct gpio_chip *chip, unsigned offset, int value) | |
219 | { | |
47513c2f | 220 | struct cp2112_device *dev = gpiochip_get_data(chip); |
e932d817 | 221 | struct hid_device *hdev = dev->hdev; |
1ffb3c40 | 222 | u8 *buf = dev->in_out_buffer; |
e932d817 DB |
223 | int ret; |
224 | ||
7a7b5df8 | 225 | mutex_lock(&dev->lock); |
1ffb3c40 | 226 | |
e932d817 DB |
227 | buf[0] = CP2112_GPIO_SET; |
228 | buf[1] = value ? 0xff : 0; | |
229 | buf[2] = 1 << offset; | |
230 | ||
1ffb3c40 BT |
231 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_SET, buf, |
232 | CP2112_GPIO_SET_LENGTH, HID_FEATURE_REPORT, | |
233 | HID_REQ_SET_REPORT); | |
e932d817 DB |
234 | if (ret < 0) |
235 | hid_err(hdev, "error setting GPIO values: %d\n", ret); | |
1ffb3c40 | 236 | |
7a7b5df8 | 237 | mutex_unlock(&dev->lock); |
e932d817 DB |
238 | } |
239 | ||
13de9cca | 240 | static int cp2112_gpio_get_all(struct gpio_chip *chip) |
e932d817 | 241 | { |
47513c2f | 242 | struct cp2112_device *dev = gpiochip_get_data(chip); |
e932d817 | 243 | struct hid_device *hdev = dev->hdev; |
1ffb3c40 | 244 | u8 *buf = dev->in_out_buffer; |
e932d817 DB |
245 | int ret; |
246 | ||
7a7b5df8 | 247 | mutex_lock(&dev->lock); |
1ffb3c40 BT |
248 | |
249 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_GET, buf, | |
250 | CP2112_GPIO_GET_LENGTH, HID_FEATURE_REPORT, | |
251 | HID_REQ_GET_REPORT); | |
252 | if (ret != CP2112_GPIO_GET_LENGTH) { | |
e932d817 | 253 | hid_err(hdev, "error requesting GPIO values: %d\n", ret); |
1ffb3c40 BT |
254 | ret = ret < 0 ? ret : -EIO; |
255 | goto exit; | |
e932d817 DB |
256 | } |
257 | ||
13de9cca | 258 | ret = buf[1]; |
1ffb3c40 BT |
259 | |
260 | exit: | |
7a7b5df8 | 261 | mutex_unlock(&dev->lock); |
1ffb3c40 BT |
262 | |
263 | return ret; | |
e932d817 DB |
264 | } |
265 | ||
13de9cca BT |
266 | static int cp2112_gpio_get(struct gpio_chip *chip, unsigned int offset) |
267 | { | |
268 | int ret; | |
269 | ||
270 | ret = cp2112_gpio_get_all(chip); | |
271 | if (ret < 0) | |
272 | return ret; | |
273 | ||
274 | return (ret >> offset) & 1; | |
275 | } | |
276 | ||
e932d817 DB |
277 | static int cp2112_gpio_direction_output(struct gpio_chip *chip, |
278 | unsigned offset, int value) | |
279 | { | |
47513c2f | 280 | struct cp2112_device *dev = gpiochip_get_data(chip); |
e932d817 | 281 | struct hid_device *hdev = dev->hdev; |
1ffb3c40 | 282 | u8 *buf = dev->in_out_buffer; |
e932d817 DB |
283 | int ret; |
284 | ||
7a7b5df8 | 285 | mutex_lock(&dev->lock); |
1ffb3c40 | 286 | |
490051ad | 287 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, |
1ffb3c40 BT |
288 | CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, |
289 | HID_REQ_GET_REPORT); | |
290 | if (ret != CP2112_GPIO_CONFIG_LENGTH) { | |
e932d817 | 291 | hid_err(hdev, "error requesting GPIO config: %d\n", ret); |
1ffb3c40 | 292 | goto fail; |
e932d817 DB |
293 | } |
294 | ||
295 | buf[1] |= 1 << offset; | |
296 | buf[2] = gpio_push_pull; | |
297 | ||
1ffb3c40 BT |
298 | ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf, |
299 | CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT, | |
300 | HID_REQ_SET_REPORT); | |
e932d817 DB |
301 | if (ret < 0) { |
302 | hid_err(hdev, "error setting GPIO config: %d\n", ret); | |
1ffb3c40 | 303 | goto fail; |
e932d817 DB |
304 | } |
305 | ||
7a7b5df8 | 306 | mutex_unlock(&dev->lock); |
1ffb3c40 | 307 | |
beb9d007 AB |
308 | /* |
309 | * Set gpio value when output direction is already set, | |
310 | * as specified in AN495, Rev. 0.2, cpt. 4.4 | |
311 | */ | |
312 | cp2112_gpio_set(chip, offset, value); | |
313 | ||
e932d817 | 314 | return 0; |
1ffb3c40 BT |
315 | |
316 | fail: | |
7a7b5df8 | 317 | mutex_unlock(&dev->lock); |
1ffb3c40 | 318 | return ret < 0 ? ret : -EIO; |
e932d817 DB |
319 | } |
320 | ||
321 | static int cp2112_hid_get(struct hid_device *hdev, unsigned char report_number, | |
322 | u8 *data, size_t count, unsigned char report_type) | |
323 | { | |
324 | u8 *buf; | |
325 | int ret; | |
326 | ||
327 | buf = kmalloc(count, GFP_KERNEL); | |
328 | if (!buf) | |
329 | return -ENOMEM; | |
330 | ||
490051ad JK |
331 | ret = hid_hw_raw_request(hdev, report_number, buf, count, |
332 | report_type, HID_REQ_GET_REPORT); | |
e932d817 DB |
333 | memcpy(data, buf, count); |
334 | kfree(buf); | |
335 | return ret; | |
336 | } | |
337 | ||
338 | static int cp2112_hid_output(struct hid_device *hdev, u8 *data, size_t count, | |
339 | unsigned char report_type) | |
340 | { | |
341 | u8 *buf; | |
342 | int ret; | |
343 | ||
344 | buf = kmemdup(data, count, GFP_KERNEL); | |
345 | if (!buf) | |
346 | return -ENOMEM; | |
347 | ||
866e4797 BT |
348 | if (report_type == HID_OUTPUT_REPORT) |
349 | ret = hid_hw_output_report(hdev, buf, count); | |
350 | else | |
351 | ret = hid_hw_raw_request(hdev, buf[0], buf, count, report_type, | |
352 | HID_REQ_SET_REPORT); | |
353 | ||
e932d817 DB |
354 | kfree(buf); |
355 | return ret; | |
356 | } | |
357 | ||
358 | static int cp2112_wait(struct cp2112_device *dev, atomic_t *avail) | |
359 | { | |
360 | int ret = 0; | |
361 | ||
362 | /* We have sent either a CP2112_TRANSFER_STATUS_REQUEST or a | |
363 | * CP2112_DATA_READ_FORCE_SEND and we are waiting for the response to | |
364 | * come in cp2112_raw_event or timeout. There will only be one of these | |
365 | * in flight at any one time. The timeout is extremely large and is a | |
366 | * last resort if the CP2112 has died. If we do timeout we don't expect | |
367 | * to receive the response which would cause data races, it's not like | |
368 | * we can do anything about it anyway. | |
369 | */ | |
370 | ret = wait_event_interruptible_timeout(dev->wait, | |
371 | atomic_read(avail), msecs_to_jiffies(RESPONSE_TIMEOUT)); | |
372 | if (-ERESTARTSYS == ret) | |
373 | return ret; | |
374 | if (!ret) | |
375 | return -ETIMEDOUT; | |
376 | ||
377 | atomic_set(avail, 0); | |
378 | return 0; | |
379 | } | |
380 | ||
381 | static int cp2112_xfer_status(struct cp2112_device *dev) | |
382 | { | |
383 | struct hid_device *hdev = dev->hdev; | |
384 | u8 buf[2]; | |
385 | int ret; | |
386 | ||
387 | buf[0] = CP2112_TRANSFER_STATUS_REQUEST; | |
388 | buf[1] = 0x01; | |
389 | atomic_set(&dev->xfer_avail, 0); | |
390 | ||
391 | ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); | |
392 | if (ret < 0) { | |
393 | hid_warn(hdev, "Error requesting status: %d\n", ret); | |
394 | return ret; | |
395 | } | |
396 | ||
397 | ret = cp2112_wait(dev, &dev->xfer_avail); | |
398 | if (ret) | |
399 | return ret; | |
400 | ||
401 | return dev->xfer_status; | |
402 | } | |
403 | ||
404 | static int cp2112_read(struct cp2112_device *dev, u8 *data, size_t size) | |
405 | { | |
406 | struct hid_device *hdev = dev->hdev; | |
407 | struct cp2112_force_read_report report; | |
408 | int ret; | |
409 | ||
6debce6f AB |
410 | if (size > sizeof(dev->read_data)) |
411 | size = sizeof(dev->read_data); | |
e932d817 DB |
412 | report.report = CP2112_DATA_READ_FORCE_SEND; |
413 | report.length = cpu_to_be16(size); | |
414 | ||
415 | atomic_set(&dev->read_avail, 0); | |
416 | ||
417 | ret = cp2112_hid_output(hdev, &report.report, sizeof(report), | |
418 | HID_OUTPUT_REPORT); | |
419 | if (ret < 0) { | |
420 | hid_warn(hdev, "Error requesting data: %d\n", ret); | |
421 | return ret; | |
422 | } | |
423 | ||
424 | ret = cp2112_wait(dev, &dev->read_avail); | |
425 | if (ret) | |
426 | return ret; | |
427 | ||
5a673fce | 428 | hid_dbg(hdev, "read %d of %zd bytes requested\n", |
e932d817 DB |
429 | dev->read_length, size); |
430 | ||
431 | if (size > dev->read_length) | |
432 | size = dev->read_length; | |
433 | ||
434 | memcpy(data, dev->read_data, size); | |
435 | return dev->read_length; | |
436 | } | |
437 | ||
438 | static int cp2112_read_req(void *buf, u8 slave_address, u16 length) | |
439 | { | |
440 | struct cp2112_read_req_report *report = buf; | |
441 | ||
442 | if (length < 1 || length > 512) | |
443 | return -EINVAL; | |
444 | ||
445 | report->report = CP2112_DATA_READ_REQUEST; | |
446 | report->slave_address = slave_address << 1; | |
447 | report->length = cpu_to_be16(length); | |
448 | return sizeof(*report); | |
449 | } | |
450 | ||
451 | static int cp2112_write_read_req(void *buf, u8 slave_address, u16 length, | |
452 | u8 command, u8 *data, u8 data_length) | |
453 | { | |
454 | struct cp2112_write_read_req_report *report = buf; | |
455 | ||
456 | if (length < 1 || length > 512 | |
457 | || data_length > sizeof(report->target_address) - 1) | |
458 | return -EINVAL; | |
459 | ||
460 | report->report = CP2112_DATA_WRITE_READ_REQUEST; | |
461 | report->slave_address = slave_address << 1; | |
462 | report->length = cpu_to_be16(length); | |
463 | report->target_address_length = data_length + 1; | |
464 | report->target_address[0] = command; | |
465 | memcpy(&report->target_address[1], data, data_length); | |
466 | return data_length + 6; | |
467 | } | |
468 | ||
469 | static int cp2112_write_req(void *buf, u8 slave_address, u8 command, u8 *data, | |
470 | u8 data_length) | |
471 | { | |
472 | struct cp2112_write_req_report *report = buf; | |
473 | ||
474 | if (data_length > sizeof(report->data) - 1) | |
475 | return -EINVAL; | |
476 | ||
477 | report->report = CP2112_DATA_WRITE_REQUEST; | |
478 | report->slave_address = slave_address << 1; | |
479 | report->length = data_length + 1; | |
480 | report->data[0] = command; | |
481 | memcpy(&report->data[1], data, data_length); | |
482 | return data_length + 4; | |
483 | } | |
484 | ||
b9029345 AB |
485 | static int cp2112_i2c_write_req(void *buf, u8 slave_address, u8 *data, |
486 | u8 data_length) | |
487 | { | |
488 | struct cp2112_write_req_report *report = buf; | |
489 | ||
490 | if (data_length > sizeof(report->data)) | |
491 | return -EINVAL; | |
492 | ||
493 | report->report = CP2112_DATA_WRITE_REQUEST; | |
494 | report->slave_address = slave_address << 1; | |
495 | report->length = data_length; | |
496 | memcpy(report->data, data, data_length); | |
497 | return data_length + 3; | |
498 | } | |
499 | ||
44eda784 EW |
500 | static int cp2112_i2c_write_read_req(void *buf, u8 slave_address, |
501 | u8 *addr, int addr_length, | |
502 | int read_length) | |
503 | { | |
504 | struct cp2112_write_read_req_report *report = buf; | |
505 | ||
506 | if (read_length < 1 || read_length > 512 || | |
507 | addr_length > sizeof(report->target_address)) | |
508 | return -EINVAL; | |
509 | ||
510 | report->report = CP2112_DATA_WRITE_READ_REQUEST; | |
511 | report->slave_address = slave_address << 1; | |
512 | report->length = cpu_to_be16(read_length); | |
513 | report->target_address_length = addr_length; | |
514 | memcpy(report->target_address, addr, addr_length); | |
515 | return addr_length + 5; | |
516 | } | |
517 | ||
b9029345 AB |
518 | static int cp2112_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, |
519 | int num) | |
520 | { | |
521 | struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; | |
522 | struct hid_device *hdev = dev->hdev; | |
523 | u8 buf[64]; | |
524 | ssize_t count; | |
44eda784 EW |
525 | ssize_t read_length = 0; |
526 | u8 *read_buf = NULL; | |
b9029345 AB |
527 | unsigned int retries; |
528 | int ret; | |
529 | ||
530 | hid_dbg(hdev, "I2C %d messages\n", num); | |
531 | ||
44eda784 EW |
532 | if (num == 1) { |
533 | if (msgs->flags & I2C_M_RD) { | |
534 | hid_dbg(hdev, "I2C read %#04x len %d\n", | |
535 | msgs->addr, msgs->len); | |
536 | read_length = msgs->len; | |
537 | read_buf = msgs->buf; | |
538 | count = cp2112_read_req(buf, msgs->addr, msgs->len); | |
539 | } else { | |
540 | hid_dbg(hdev, "I2C write %#04x len %d\n", | |
541 | msgs->addr, msgs->len); | |
542 | count = cp2112_i2c_write_req(buf, msgs->addr, | |
543 | msgs->buf, msgs->len); | |
544 | } | |
545 | if (count < 0) | |
546 | return count; | |
547 | } else if (dev->hwversion > 1 && /* no repeated start in rev 1 */ | |
548 | num == 2 && | |
549 | msgs[0].addr == msgs[1].addr && | |
550 | !(msgs[0].flags & I2C_M_RD) && (msgs[1].flags & I2C_M_RD)) { | |
551 | hid_dbg(hdev, "I2C write-read %#04x wlen %d rlen %d\n", | |
552 | msgs[0].addr, msgs[0].len, msgs[1].len); | |
553 | read_length = msgs[1].len; | |
554 | read_buf = msgs[1].buf; | |
555 | count = cp2112_i2c_write_read_req(buf, msgs[0].addr, | |
556 | msgs[0].buf, msgs[0].len, msgs[1].len); | |
557 | if (count < 0) | |
558 | return count; | |
559 | } else { | |
b9029345 AB |
560 | hid_err(hdev, |
561 | "Multi-message I2C transactions not supported\n"); | |
562 | return -EOPNOTSUPP; | |
563 | } | |
564 | ||
b9029345 AB |
565 | ret = hid_hw_power(hdev, PM_HINT_FULLON); |
566 | if (ret < 0) { | |
567 | hid_err(hdev, "power management error: %d\n", ret); | |
568 | return ret; | |
569 | } | |
570 | ||
571 | ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); | |
572 | if (ret < 0) { | |
573 | hid_warn(hdev, "Error starting transaction: %d\n", ret); | |
574 | goto power_normal; | |
575 | } | |
576 | ||
577 | for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { | |
578 | ret = cp2112_xfer_status(dev); | |
579 | if (-EBUSY == ret) | |
580 | continue; | |
581 | if (ret < 0) | |
582 | goto power_normal; | |
583 | break; | |
584 | } | |
585 | ||
586 | if (XFER_STATUS_RETRIES <= retries) { | |
587 | hid_warn(hdev, "Transfer timed out, cancelling.\n"); | |
588 | buf[0] = CP2112_CANCEL_TRANSFER; | |
589 | buf[1] = 0x01; | |
590 | ||
591 | ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); | |
592 | if (ret < 0) | |
593 | hid_warn(hdev, "Error cancelling transaction: %d\n", | |
594 | ret); | |
595 | ||
596 | ret = -ETIMEDOUT; | |
597 | goto power_normal; | |
598 | } | |
599 | ||
44eda784 EW |
600 | for (count = 0; count < read_length;) { |
601 | ret = cp2112_read(dev, read_buf + count, read_length - count); | |
5ddfb12e EW |
602 | if (ret < 0) |
603 | goto power_normal; | |
604 | if (ret == 0) { | |
605 | hid_err(hdev, "read returned 0\n"); | |
606 | ret = -EIO; | |
607 | goto power_normal; | |
608 | } | |
609 | count += ret; | |
44eda784 | 610 | if (count > read_length) { |
5ddfb12e EW |
611 | /* |
612 | * The hardware returned too much data. | |
613 | * This is mostly harmless because cp2112_read() | |
614 | * has a limit check so didn't overrun our | |
615 | * buffer. Nevertheless, we return an error | |
616 | * because something is seriously wrong and | |
617 | * it shouldn't go unnoticed. | |
618 | */ | |
619 | hid_err(hdev, "long read: %d > %zd\n", | |
44eda784 | 620 | ret, read_length - count + ret); |
5ddfb12e EW |
621 | ret = -EIO; |
622 | goto power_normal; | |
623 | } | |
b9029345 AB |
624 | } |
625 | ||
b9029345 | 626 | /* return the number of transferred messages */ |
44eda784 | 627 | ret = num; |
b9029345 AB |
628 | |
629 | power_normal: | |
630 | hid_hw_power(hdev, PM_HINT_NORMAL); | |
631 | hid_dbg(hdev, "I2C transfer finished: %d\n", ret); | |
632 | return ret; | |
633 | } | |
634 | ||
e932d817 DB |
635 | static int cp2112_xfer(struct i2c_adapter *adap, u16 addr, |
636 | unsigned short flags, char read_write, u8 command, | |
637 | int size, union i2c_smbus_data *data) | |
638 | { | |
639 | struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data; | |
640 | struct hid_device *hdev = dev->hdev; | |
641 | u8 buf[64]; | |
29e2d6d1 | 642 | __le16 word; |
0438ee70 | 643 | ssize_t count; |
e932d817 DB |
644 | size_t read_length = 0; |
645 | unsigned int retries; | |
646 | int ret; | |
647 | ||
648 | hid_dbg(hdev, "%s addr 0x%x flags 0x%x cmd 0x%x size %d\n", | |
649 | read_write == I2C_SMBUS_WRITE ? "write" : "read", | |
650 | addr, flags, command, size); | |
651 | ||
652 | switch (size) { | |
653 | case I2C_SMBUS_BYTE: | |
654 | read_length = 1; | |
655 | ||
656 | if (I2C_SMBUS_READ == read_write) | |
657 | count = cp2112_read_req(buf, addr, read_length); | |
658 | else | |
6d00d153 | 659 | count = cp2112_write_req(buf, addr, command, NULL, |
e932d817 DB |
660 | 0); |
661 | break; | |
662 | case I2C_SMBUS_BYTE_DATA: | |
663 | read_length = 1; | |
664 | ||
665 | if (I2C_SMBUS_READ == read_write) | |
666 | count = cp2112_write_read_req(buf, addr, read_length, | |
667 | command, NULL, 0); | |
668 | else | |
669 | count = cp2112_write_req(buf, addr, command, | |
670 | &data->byte, 1); | |
671 | break; | |
672 | case I2C_SMBUS_WORD_DATA: | |
673 | read_length = 2; | |
29e2d6d1 | 674 | word = cpu_to_le16(data->word); |
e932d817 DB |
675 | |
676 | if (I2C_SMBUS_READ == read_write) | |
677 | count = cp2112_write_read_req(buf, addr, read_length, | |
678 | command, NULL, 0); | |
679 | else | |
680 | count = cp2112_write_req(buf, addr, command, | |
681 | (u8 *)&word, 2); | |
682 | break; | |
683 | case I2C_SMBUS_PROC_CALL: | |
684 | size = I2C_SMBUS_WORD_DATA; | |
685 | read_write = I2C_SMBUS_READ; | |
686 | read_length = 2; | |
29e2d6d1 | 687 | word = cpu_to_le16(data->word); |
e932d817 DB |
688 | |
689 | count = cp2112_write_read_req(buf, addr, read_length, command, | |
690 | (u8 *)&word, 2); | |
691 | break; | |
692 | case I2C_SMBUS_I2C_BLOCK_DATA: | |
542134c0 ES |
693 | if (read_write == I2C_SMBUS_READ) { |
694 | read_length = data->block[0]; | |
695 | count = cp2112_write_read_req(buf, addr, read_length, | |
696 | command, NULL, 0); | |
697 | } else { | |
698 | count = cp2112_write_req(buf, addr, command, | |
699 | data->block + 1, | |
700 | data->block[0]); | |
701 | } | |
702 | break; | |
e932d817 DB |
703 | case I2C_SMBUS_BLOCK_DATA: |
704 | if (I2C_SMBUS_READ == read_write) { | |
705 | count = cp2112_write_read_req(buf, addr, | |
706 | I2C_SMBUS_BLOCK_MAX, | |
707 | command, NULL, 0); | |
708 | } else { | |
709 | count = cp2112_write_req(buf, addr, command, | |
710 | data->block, | |
711 | data->block[0] + 1); | |
712 | } | |
713 | break; | |
714 | case I2C_SMBUS_BLOCK_PROC_CALL: | |
715 | size = I2C_SMBUS_BLOCK_DATA; | |
716 | read_write = I2C_SMBUS_READ; | |
717 | ||
718 | count = cp2112_write_read_req(buf, addr, I2C_SMBUS_BLOCK_MAX, | |
719 | command, data->block, | |
720 | data->block[0] + 1); | |
721 | break; | |
722 | default: | |
723 | hid_warn(hdev, "Unsupported transaction %d\n", size); | |
724 | return -EOPNOTSUPP; | |
725 | } | |
726 | ||
727 | if (count < 0) | |
728 | return count; | |
729 | ||
730 | ret = hid_hw_power(hdev, PM_HINT_FULLON); | |
731 | if (ret < 0) { | |
732 | hid_err(hdev, "power management error: %d\n", ret); | |
733 | return ret; | |
734 | } | |
735 | ||
736 | ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT); | |
737 | if (ret < 0) { | |
738 | hid_warn(hdev, "Error starting transaction: %d\n", ret); | |
739 | goto power_normal; | |
740 | } | |
741 | ||
742 | for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) { | |
743 | ret = cp2112_xfer_status(dev); | |
744 | if (-EBUSY == ret) | |
745 | continue; | |
746 | if (ret < 0) | |
747 | goto power_normal; | |
748 | break; | |
749 | } | |
750 | ||
751 | if (XFER_STATUS_RETRIES <= retries) { | |
752 | hid_warn(hdev, "Transfer timed out, cancelling.\n"); | |
753 | buf[0] = CP2112_CANCEL_TRANSFER; | |
754 | buf[1] = 0x01; | |
755 | ||
756 | ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT); | |
757 | if (ret < 0) | |
758 | hid_warn(hdev, "Error cancelling transaction: %d\n", | |
759 | ret); | |
760 | ||
761 | ret = -ETIMEDOUT; | |
762 | goto power_normal; | |
763 | } | |
764 | ||
765 | if (I2C_SMBUS_WRITE == read_write) { | |
766 | ret = 0; | |
767 | goto power_normal; | |
768 | } | |
769 | ||
770 | if (I2C_SMBUS_BLOCK_DATA == size) | |
771 | read_length = ret; | |
772 | ||
773 | ret = cp2112_read(dev, buf, read_length); | |
774 | if (ret < 0) | |
775 | goto power_normal; | |
776 | if (ret != read_length) { | |
5a673fce | 777 | hid_warn(hdev, "short read: %d < %zd\n", ret, read_length); |
e932d817 DB |
778 | ret = -EIO; |
779 | goto power_normal; | |
780 | } | |
781 | ||
782 | switch (size) { | |
783 | case I2C_SMBUS_BYTE: | |
784 | case I2C_SMBUS_BYTE_DATA: | |
785 | data->byte = buf[0]; | |
786 | break; | |
787 | case I2C_SMBUS_WORD_DATA: | |
29e2d6d1 | 788 | data->word = le16_to_cpup((__le16 *)buf); |
e932d817 | 789 | break; |
542134c0 ES |
790 | case I2C_SMBUS_I2C_BLOCK_DATA: |
791 | memcpy(data->block + 1, buf, read_length); | |
792 | break; | |
e932d817 DB |
793 | case I2C_SMBUS_BLOCK_DATA: |
794 | if (read_length > I2C_SMBUS_BLOCK_MAX) { | |
795 | ret = -EPROTO; | |
796 | goto power_normal; | |
797 | } | |
798 | ||
799 | memcpy(data->block, buf, read_length); | |
800 | break; | |
801 | } | |
802 | ||
803 | ret = 0; | |
804 | power_normal: | |
805 | hid_hw_power(hdev, PM_HINT_NORMAL); | |
806 | hid_dbg(hdev, "transfer finished: %d\n", ret); | |
807 | return ret; | |
808 | } | |
809 | ||
810 | static u32 cp2112_functionality(struct i2c_adapter *adap) | |
811 | { | |
b9029345 AB |
812 | return I2C_FUNC_I2C | |
813 | I2C_FUNC_SMBUS_BYTE | | |
e932d817 DB |
814 | I2C_FUNC_SMBUS_BYTE_DATA | |
815 | I2C_FUNC_SMBUS_WORD_DATA | | |
816 | I2C_FUNC_SMBUS_BLOCK_DATA | | |
817 | I2C_FUNC_SMBUS_I2C_BLOCK | | |
818 | I2C_FUNC_SMBUS_PROC_CALL | | |
819 | I2C_FUNC_SMBUS_BLOCK_PROC_CALL; | |
820 | } | |
821 | ||
822 | static const struct i2c_algorithm smbus_algorithm = { | |
b9029345 | 823 | .master_xfer = cp2112_i2c_xfer, |
e932d817 DB |
824 | .smbus_xfer = cp2112_xfer, |
825 | .functionality = cp2112_functionality, | |
826 | }; | |
827 | ||
828 | static int cp2112_get_usb_config(struct hid_device *hdev, | |
829 | struct cp2112_usb_config_report *cfg) | |
830 | { | |
831 | int ret; | |
832 | ||
833 | ret = cp2112_hid_get(hdev, CP2112_USB_CONFIG, (u8 *)cfg, sizeof(*cfg), | |
834 | HID_FEATURE_REPORT); | |
835 | if (ret != sizeof(*cfg)) { | |
836 | hid_err(hdev, "error reading usb config: %d\n", ret); | |
837 | if (ret < 0) | |
838 | return ret; | |
839 | return -EIO; | |
840 | } | |
841 | ||
842 | return 0; | |
843 | } | |
844 | ||
845 | static int cp2112_set_usb_config(struct hid_device *hdev, | |
846 | struct cp2112_usb_config_report *cfg) | |
847 | { | |
848 | int ret; | |
849 | ||
850 | BUG_ON(cfg->report != CP2112_USB_CONFIG); | |
851 | ||
852 | ret = cp2112_hid_output(hdev, (u8 *)cfg, sizeof(*cfg), | |
853 | HID_FEATURE_REPORT); | |
854 | if (ret != sizeof(*cfg)) { | |
855 | hid_err(hdev, "error writing usb config: %d\n", ret); | |
856 | if (ret < 0) | |
857 | return ret; | |
858 | return -EIO; | |
859 | } | |
860 | ||
861 | return 0; | |
862 | } | |
863 | ||
864 | static void chmod_sysfs_attrs(struct hid_device *hdev); | |
865 | ||
866 | #define CP2112_CONFIG_ATTR(name, store, format, ...) \ | |
867 | static ssize_t name##_store(struct device *kdev, \ | |
868 | struct device_attribute *attr, const char *buf, \ | |
869 | size_t count) \ | |
870 | { \ | |
ee79a8f8 | 871 | struct hid_device *hdev = to_hid_device(kdev); \ |
e932d817 DB |
872 | struct cp2112_usb_config_report cfg; \ |
873 | int ret = cp2112_get_usb_config(hdev, &cfg); \ | |
874 | if (ret) \ | |
875 | return ret; \ | |
876 | store; \ | |
877 | ret = cp2112_set_usb_config(hdev, &cfg); \ | |
878 | if (ret) \ | |
879 | return ret; \ | |
880 | chmod_sysfs_attrs(hdev); \ | |
881 | return count; \ | |
882 | } \ | |
883 | static ssize_t name##_show(struct device *kdev, \ | |
884 | struct device_attribute *attr, char *buf) \ | |
885 | { \ | |
ee79a8f8 | 886 | struct hid_device *hdev = to_hid_device(kdev); \ |
e932d817 DB |
887 | struct cp2112_usb_config_report cfg; \ |
888 | int ret = cp2112_get_usb_config(hdev, &cfg); \ | |
889 | if (ret) \ | |
890 | return ret; \ | |
891 | return scnprintf(buf, PAGE_SIZE, format, ##__VA_ARGS__); \ | |
892 | } \ | |
c3c041ba | 893 | static DEVICE_ATTR_RW(name); |
e932d817 DB |
894 | |
895 | CP2112_CONFIG_ATTR(vendor_id, ({ | |
896 | u16 vid; | |
897 | ||
898 | if (sscanf(buf, "%hi", &vid) != 1) | |
899 | return -EINVAL; | |
900 | ||
901 | cfg.vid = cpu_to_le16(vid); | |
902 | cfg.mask = 0x01; | |
903 | }), "0x%04x\n", le16_to_cpu(cfg.vid)); | |
904 | ||
905 | CP2112_CONFIG_ATTR(product_id, ({ | |
906 | u16 pid; | |
907 | ||
908 | if (sscanf(buf, "%hi", &pid) != 1) | |
909 | return -EINVAL; | |
910 | ||
911 | cfg.pid = cpu_to_le16(pid); | |
912 | cfg.mask = 0x02; | |
913 | }), "0x%04x\n", le16_to_cpu(cfg.pid)); | |
914 | ||
915 | CP2112_CONFIG_ATTR(max_power, ({ | |
916 | int mA; | |
917 | ||
918 | if (sscanf(buf, "%i", &mA) != 1) | |
919 | return -EINVAL; | |
920 | ||
921 | cfg.max_power = (mA + 1) / 2; | |
922 | cfg.mask = 0x04; | |
923 | }), "%u mA\n", cfg.max_power * 2); | |
924 | ||
925 | CP2112_CONFIG_ATTR(power_mode, ({ | |
926 | if (sscanf(buf, "%hhi", &cfg.power_mode) != 1) | |
927 | return -EINVAL; | |
928 | ||
929 | cfg.mask = 0x08; | |
930 | }), "%u\n", cfg.power_mode); | |
931 | ||
932 | CP2112_CONFIG_ATTR(release_version, ({ | |
933 | if (sscanf(buf, "%hhi.%hhi", &cfg.release_major, &cfg.release_minor) | |
934 | != 2) | |
935 | return -EINVAL; | |
936 | ||
937 | cfg.mask = 0x10; | |
938 | }), "%u.%u\n", cfg.release_major, cfg.release_minor); | |
939 | ||
940 | #undef CP2112_CONFIG_ATTR | |
941 | ||
942 | struct cp2112_pstring_attribute { | |
943 | struct device_attribute attr; | |
944 | unsigned char report; | |
945 | }; | |
946 | ||
947 | static ssize_t pstr_store(struct device *kdev, | |
948 | struct device_attribute *kattr, const char *buf, | |
949 | size_t count) | |
950 | { | |
ee79a8f8 | 951 | struct hid_device *hdev = to_hid_device(kdev); |
e932d817 DB |
952 | struct cp2112_pstring_attribute *attr = |
953 | container_of(kattr, struct cp2112_pstring_attribute, attr); | |
954 | struct cp2112_string_report report; | |
955 | int ret; | |
956 | ||
957 | memset(&report, 0, sizeof(report)); | |
958 | ||
959 | ret = utf8s_to_utf16s(buf, count, UTF16_LITTLE_ENDIAN, | |
960 | report.string, ARRAY_SIZE(report.string)); | |
961 | report.report = attr->report; | |
962 | report.length = ret * sizeof(report.string[0]) + 2; | |
963 | report.type = USB_DT_STRING; | |
964 | ||
965 | ret = cp2112_hid_output(hdev, &report.report, report.length + 1, | |
966 | HID_FEATURE_REPORT); | |
967 | if (ret != report.length + 1) { | |
968 | hid_err(hdev, "error writing %s string: %d\n", kattr->attr.name, | |
969 | ret); | |
970 | if (ret < 0) | |
971 | return ret; | |
972 | return -EIO; | |
973 | } | |
974 | ||
975 | chmod_sysfs_attrs(hdev); | |
976 | return count; | |
977 | } | |
978 | ||
979 | static ssize_t pstr_show(struct device *kdev, | |
980 | struct device_attribute *kattr, char *buf) | |
981 | { | |
ee79a8f8 | 982 | struct hid_device *hdev = to_hid_device(kdev); |
e932d817 DB |
983 | struct cp2112_pstring_attribute *attr = |
984 | container_of(kattr, struct cp2112_pstring_attribute, attr); | |
985 | struct cp2112_string_report report; | |
986 | u8 length; | |
987 | int ret; | |
988 | ||
989 | ret = cp2112_hid_get(hdev, attr->report, &report.report, | |
990 | sizeof(report) - 1, HID_FEATURE_REPORT); | |
991 | if (ret < 3) { | |
992 | hid_err(hdev, "error reading %s string: %d\n", kattr->attr.name, | |
993 | ret); | |
994 | if (ret < 0) | |
995 | return ret; | |
996 | return -EIO; | |
997 | } | |
998 | ||
999 | if (report.length < 2) { | |
1000 | hid_err(hdev, "invalid %s string length: %d\n", | |
1001 | kattr->attr.name, report.length); | |
1002 | return -EIO; | |
1003 | } | |
1004 | ||
1005 | length = report.length > ret - 1 ? ret - 1 : report.length; | |
1006 | length = (length - 2) / sizeof(report.string[0]); | |
1007 | ret = utf16s_to_utf8s(report.string, length, UTF16_LITTLE_ENDIAN, buf, | |
1008 | PAGE_SIZE - 1); | |
1009 | buf[ret++] = '\n'; | |
1010 | return ret; | |
1011 | } | |
1012 | ||
1013 | #define CP2112_PSTR_ATTR(name, _report) \ | |
c3c041ba | 1014 | static struct cp2112_pstring_attribute dev_attr_##name = { \ |
e932d817 DB |
1015 | .attr = __ATTR(name, (S_IWUSR | S_IRUGO), pstr_show, pstr_store), \ |
1016 | .report = _report, \ | |
1017 | }; | |
1018 | ||
1019 | CP2112_PSTR_ATTR(manufacturer, CP2112_MANUFACTURER_STRING); | |
1020 | CP2112_PSTR_ATTR(product, CP2112_PRODUCT_STRING); | |
1021 | CP2112_PSTR_ATTR(serial, CP2112_SERIAL_STRING); | |
1022 | ||
1023 | #undef CP2112_PSTR_ATTR | |
1024 | ||
1025 | static const struct attribute_group cp2112_attr_group = { | |
1026 | .attrs = (struct attribute *[]){ | |
1027 | &dev_attr_vendor_id.attr, | |
1028 | &dev_attr_product_id.attr, | |
1029 | &dev_attr_max_power.attr, | |
1030 | &dev_attr_power_mode.attr, | |
1031 | &dev_attr_release_version.attr, | |
1032 | &dev_attr_manufacturer.attr.attr, | |
1033 | &dev_attr_product.attr.attr, | |
1034 | &dev_attr_serial.attr.attr, | |
1035 | NULL | |
1036 | } | |
1037 | }; | |
1038 | ||
1039 | /* Chmoding our sysfs attributes is simply a way to expose which fields in the | |
1040 | * PROM have already been programmed. We do not depend on this preventing | |
1041 | * writing to these attributes since the CP2112 will simply ignore writes to | |
1042 | * already-programmed fields. This is why there is no sense in fixing this | |
1043 | * racy behaviour. | |
1044 | */ | |
1045 | static void chmod_sysfs_attrs(struct hid_device *hdev) | |
1046 | { | |
1047 | struct attribute **attr; | |
1048 | u8 buf[2]; | |
1049 | int ret; | |
1050 | ||
1051 | ret = cp2112_hid_get(hdev, CP2112_LOCK_BYTE, buf, sizeof(buf), | |
1052 | HID_FEATURE_REPORT); | |
1053 | if (ret != sizeof(buf)) { | |
1054 | hid_err(hdev, "error reading lock byte: %d\n", ret); | |
1055 | return; | |
1056 | } | |
1057 | ||
1058 | for (attr = cp2112_attr_group.attrs; *attr; ++attr) { | |
1059 | umode_t mode = (buf[1] & 1) ? S_IWUSR | S_IRUGO : S_IRUGO; | |
1060 | ret = sysfs_chmod_file(&hdev->dev.kobj, *attr, mode); | |
1061 | if (ret < 0) | |
1062 | hid_err(hdev, "error chmoding sysfs file %s\n", | |
1063 | (*attr)->name); | |
1064 | buf[1] >>= 1; | |
1065 | } | |
1066 | } | |
1067 | ||
13de9cca BT |
1068 | static void cp2112_gpio_irq_ack(struct irq_data *d) |
1069 | { | |
1070 | } | |
1071 | ||
1072 | static void cp2112_gpio_irq_mask(struct irq_data *d) | |
1073 | { | |
1074 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d); | |
1075 | struct cp2112_device *dev = gpiochip_get_data(gc); | |
1076 | ||
1077 | __clear_bit(d->hwirq, &dev->irq_mask); | |
1078 | } | |
1079 | ||
1080 | static void cp2112_gpio_irq_unmask(struct irq_data *d) | |
1081 | { | |
1082 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d); | |
1083 | struct cp2112_device *dev = gpiochip_get_data(gc); | |
1084 | ||
1085 | __set_bit(d->hwirq, &dev->irq_mask); | |
1086 | } | |
1087 | ||
1088 | static void cp2112_gpio_poll_callback(struct work_struct *work) | |
1089 | { | |
1090 | struct cp2112_device *dev = container_of(work, struct cp2112_device, | |
1091 | gpio_poll_worker.work); | |
1092 | struct irq_data *d; | |
1093 | u8 gpio_mask; | |
1094 | u8 virqs = (u8)dev->irq_mask; | |
1095 | u32 irq_type; | |
1096 | int irq, virq, ret; | |
1097 | ||
1098 | ret = cp2112_gpio_get_all(&dev->gc); | |
1099 | if (ret == -ENODEV) /* the hardware has been disconnected */ | |
1100 | return; | |
1101 | if (ret < 0) | |
1102 | goto exit; | |
1103 | ||
1104 | gpio_mask = ret; | |
1105 | ||
1106 | while (virqs) { | |
1107 | virq = ffs(virqs) - 1; | |
1108 | virqs &= ~BIT(virq); | |
1109 | ||
1110 | if (!dev->gc.to_irq) | |
1111 | break; | |
1112 | ||
1113 | irq = dev->gc.to_irq(&dev->gc, virq); | |
1114 | ||
1115 | d = irq_get_irq_data(irq); | |
1116 | if (!d) | |
1117 | continue; | |
1118 | ||
1119 | irq_type = irqd_get_trigger_type(d); | |
1120 | ||
1121 | if (gpio_mask & BIT(virq)) { | |
1122 | /* Level High */ | |
1123 | ||
1124 | if (irq_type & IRQ_TYPE_LEVEL_HIGH) | |
1125 | handle_nested_irq(irq); | |
1126 | ||
1127 | if ((irq_type & IRQ_TYPE_EDGE_RISING) && | |
1128 | !(dev->gpio_prev_state & BIT(virq))) | |
1129 | handle_nested_irq(irq); | |
1130 | } else { | |
1131 | /* Level Low */ | |
1132 | ||
1133 | if (irq_type & IRQ_TYPE_LEVEL_LOW) | |
1134 | handle_nested_irq(irq); | |
1135 | ||
1136 | if ((irq_type & IRQ_TYPE_EDGE_FALLING) && | |
1137 | (dev->gpio_prev_state & BIT(virq))) | |
1138 | handle_nested_irq(irq); | |
1139 | } | |
1140 | } | |
1141 | ||
1142 | dev->gpio_prev_state = gpio_mask; | |
1143 | ||
1144 | exit: | |
1145 | if (dev->gpio_poll) | |
1146 | schedule_delayed_work(&dev->gpio_poll_worker, 10); | |
1147 | } | |
1148 | ||
1149 | ||
1150 | static unsigned int cp2112_gpio_irq_startup(struct irq_data *d) | |
1151 | { | |
1152 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d); | |
1153 | struct cp2112_device *dev = gpiochip_get_data(gc); | |
1154 | ||
1155 | INIT_DELAYED_WORK(&dev->gpio_poll_worker, cp2112_gpio_poll_callback); | |
1156 | ||
13de9cca BT |
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 | ||
13de9cca BT |
1179 | static int __maybe_unused cp2112_allocate_irq(struct cp2112_device *dev, |
1180 | int pin) | |
1181 | { | |
1182 | int ret; | |
1183 | ||
1184 | if (dev->desc[pin]) | |
1185 | return -EINVAL; | |
1186 | ||
1187 | dev->desc[pin] = gpiochip_request_own_desc(&dev->gc, pin, | |
5923ea6c LW |
1188 | "HID/I2C:Event", |
1189 | GPIO_ACTIVE_HIGH, | |
1190 | GPIOD_IN); | |
13de9cca BT |
1191 | if (IS_ERR(dev->desc[pin])) { |
1192 | dev_err(dev->gc.parent, "Failed to request GPIO\n"); | |
1193 | return PTR_ERR(dev->desc[pin]); | |
1194 | } | |
1195 | ||
2d05dba2 BT |
1196 | ret = cp2112_gpio_direction_input(&dev->gc, pin); |
1197 | if (ret < 0) { | |
1198 | dev_err(dev->gc.parent, "Failed to set GPIO to input dir\n"); | |
1199 | goto err_desc; | |
1200 | } | |
1201 | ||
13de9cca BT |
1202 | ret = gpiochip_lock_as_irq(&dev->gc, pin); |
1203 | if (ret) { | |
1204 | dev_err(dev->gc.parent, "Failed to lock GPIO as interrupt\n"); | |
1205 | goto err_desc; | |
1206 | } | |
1207 | ||
1208 | ret = gpiod_to_irq(dev->desc[pin]); | |
1209 | if (ret < 0) { | |
1210 | dev_err(dev->gc.parent, "Failed to translate GPIO to IRQ\n"); | |
1211 | goto err_lock; | |
1212 | } | |
1213 | ||
1214 | return ret; | |
1215 | ||
1216 | err_lock: | |
1217 | gpiochip_unlock_as_irq(&dev->gc, pin); | |
1218 | err_desc: | |
1219 | gpiochip_free_own_desc(dev->desc[pin]); | |
1220 | dev->desc[pin] = NULL; | |
1221 | return ret; | |
1222 | } | |
1223 | ||
e932d817 DB |
1224 | static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id) |
1225 | { | |
1226 | struct cp2112_device *dev; | |
1227 | u8 buf[3]; | |
1228 | struct cp2112_smbus_config_report config; | |
6bfa3175 | 1229 | struct gpio_irq_chip *girq; |
e932d817 DB |
1230 | int ret; |
1231 | ||
1ffb3c40 BT |
1232 | dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL); |
1233 | if (!dev) | |
1234 | return -ENOMEM; | |
1235 | ||
1236 | dev->in_out_buffer = devm_kzalloc(&hdev->dev, CP2112_REPORT_MAX_LENGTH, | |
1237 | GFP_KERNEL); | |
1238 | if (!dev->in_out_buffer) | |
1239 | return -ENOMEM; | |
1240 | ||
7a7b5df8 | 1241 | mutex_init(&dev->lock); |
1ffb3c40 | 1242 | |
e932d817 DB |
1243 | ret = hid_parse(hdev); |
1244 | if (ret) { | |
1245 | hid_err(hdev, "parse failed\n"); | |
1246 | return ret; | |
1247 | } | |
1248 | ||
1249 | ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW); | |
1250 | if (ret) { | |
1251 | hid_err(hdev, "hw start failed\n"); | |
1252 | return ret; | |
1253 | } | |
1254 | ||
1255 | ret = hid_hw_open(hdev); | |
1256 | if (ret) { | |
1257 | hid_err(hdev, "hw open failed\n"); | |
1258 | goto err_hid_stop; | |
1259 | } | |
1260 | ||
1261 | ret = hid_hw_power(hdev, PM_HINT_FULLON); | |
1262 | if (ret < 0) { | |
1263 | hid_err(hdev, "power management error: %d\n", ret); | |
1264 | goto err_hid_close; | |
1265 | } | |
1266 | ||
1267 | ret = cp2112_hid_get(hdev, CP2112_GET_VERSION_INFO, buf, sizeof(buf), | |
1268 | HID_FEATURE_REPORT); | |
1269 | if (ret != sizeof(buf)) { | |
1270 | hid_err(hdev, "error requesting version\n"); | |
1271 | if (ret >= 0) | |
1272 | ret = -EIO; | |
1273 | goto err_power_normal; | |
1274 | } | |
1275 | ||
1276 | hid_info(hdev, "Part Number: 0x%02X Device Version: 0x%02X\n", | |
1277 | buf[1], buf[2]); | |
1278 | ||
1279 | ret = cp2112_hid_get(hdev, CP2112_SMBUS_CONFIG, (u8 *)&config, | |
1280 | sizeof(config), HID_FEATURE_REPORT); | |
1281 | if (ret != sizeof(config)) { | |
1282 | hid_err(hdev, "error requesting SMBus config\n"); | |
1283 | if (ret >= 0) | |
1284 | ret = -EIO; | |
1285 | goto err_power_normal; | |
1286 | } | |
1287 | ||
1288 | config.retry_time = cpu_to_be16(1); | |
1289 | ||
1290 | ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config), | |
1291 | HID_FEATURE_REPORT); | |
1292 | if (ret != sizeof(config)) { | |
1293 | hid_err(hdev, "error setting SMBus config\n"); | |
1294 | if (ret >= 0) | |
1295 | ret = -EIO; | |
1296 | goto err_power_normal; | |
1297 | } | |
1298 | ||
e932d817 DB |
1299 | hid_set_drvdata(hdev, (void *)dev); |
1300 | dev->hdev = hdev; | |
1301 | dev->adap.owner = THIS_MODULE; | |
1302 | dev->adap.class = I2C_CLASS_HWMON; | |
1303 | dev->adap.algo = &smbus_algorithm; | |
1304 | dev->adap.algo_data = dev; | |
1305 | dev->adap.dev.parent = &hdev->dev; | |
1306 | snprintf(dev->adap.name, sizeof(dev->adap.name), | |
42cb6b35 JK |
1307 | "CP2112 SMBus Bridge on hidraw%d", |
1308 | ((struct hidraw *)hdev->hidraw)->minor); | |
44eda784 | 1309 | dev->hwversion = buf[2]; |
e932d817 DB |
1310 | init_waitqueue_head(&dev->wait); |
1311 | ||
1312 | hid_device_io_start(hdev); | |
1313 | ret = i2c_add_adapter(&dev->adap); | |
1314 | hid_device_io_stop(hdev); | |
1315 | ||
1316 | if (ret) { | |
1317 | hid_err(hdev, "error registering i2c adapter\n"); | |
1ffb3c40 | 1318 | goto err_power_normal; |
e932d817 DB |
1319 | } |
1320 | ||
1321 | hid_dbg(hdev, "adapter registered\n"); | |
1322 | ||
1323 | dev->gc.label = "cp2112_gpio"; | |
1324 | dev->gc.direction_input = cp2112_gpio_direction_input; | |
1325 | dev->gc.direction_output = cp2112_gpio_direction_output; | |
1326 | dev->gc.set = cp2112_gpio_set; | |
1327 | dev->gc.get = cp2112_gpio_get; | |
1328 | dev->gc.base = -1; | |
1329 | dev->gc.ngpio = 8; | |
1330 | dev->gc.can_sleep = 1; | |
58383c78 | 1331 | dev->gc.parent = &hdev->dev; |
e932d817 | 1332 | |
2a2b09c8 DG |
1333 | dev->irq.name = "cp2112-gpio"; |
1334 | dev->irq.irq_startup = cp2112_gpio_irq_startup; | |
1335 | dev->irq.irq_shutdown = cp2112_gpio_irq_shutdown; | |
1336 | dev->irq.irq_ack = cp2112_gpio_irq_ack; | |
1337 | dev->irq.irq_mask = cp2112_gpio_irq_mask; | |
1338 | dev->irq.irq_unmask = cp2112_gpio_irq_unmask; | |
1339 | dev->irq.irq_set_type = cp2112_gpio_irq_type; | |
1340 | dev->irq.flags = IRQCHIP_MASK_ON_SUSPEND; | |
1341 | ||
6bfa3175 | 1342 | girq = &dev->gc.irq; |
2a2b09c8 | 1343 | girq->chip = &dev->irq; |
6bfa3175 LW |
1344 | /* The event comes from the outside so no parent handler */ |
1345 | girq->parent_handler = NULL; | |
1346 | girq->num_parents = 0; | |
1347 | girq->parents = NULL; | |
1348 | girq->default_type = IRQ_TYPE_NONE; | |
1349 | girq->handler = handle_simple_irq; | |
1350 | ||
47513c2f | 1351 | ret = gpiochip_add_data(&dev->gc, dev); |
e932d817 DB |
1352 | if (ret < 0) { |
1353 | hid_err(hdev, "error registering gpio chip\n"); | |
1354 | goto err_free_i2c; | |
1355 | } | |
1356 | ||
1357 | ret = sysfs_create_group(&hdev->dev.kobj, &cp2112_attr_group); | |
1358 | if (ret < 0) { | |
1359 | hid_err(hdev, "error creating sysfs attrs\n"); | |
1360 | goto err_gpiochip_remove; | |
1361 | } | |
1362 | ||
1363 | chmod_sysfs_attrs(hdev); | |
1364 | hid_hw_power(hdev, PM_HINT_NORMAL); | |
1365 | ||
1366 | return ret; | |
1367 | ||
1368 | err_gpiochip_remove: | |
88d5e520 | 1369 | gpiochip_remove(&dev->gc); |
e932d817 DB |
1370 | err_free_i2c: |
1371 | i2c_del_adapter(&dev->adap); | |
e932d817 DB |
1372 | err_power_normal: |
1373 | hid_hw_power(hdev, PM_HINT_NORMAL); | |
1374 | err_hid_close: | |
1375 | hid_hw_close(hdev); | |
1376 | err_hid_stop: | |
1377 | hid_hw_stop(hdev); | |
1378 | return ret; | |
1379 | } | |
1380 | ||
1381 | static void cp2112_remove(struct hid_device *hdev) | |
1382 | { | |
1383 | struct cp2112_device *dev = hid_get_drvdata(hdev); | |
13de9cca | 1384 | int i; |
e932d817 DB |
1385 | |
1386 | sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group); | |
e932d817 | 1387 | i2c_del_adapter(&dev->adap); |
13de9cca BT |
1388 | |
1389 | if (dev->gpio_poll) { | |
1390 | dev->gpio_poll = false; | |
1391 | cancel_delayed_work_sync(&dev->gpio_poll_worker); | |
1392 | } | |
1393 | ||
1394 | for (i = 0; i < ARRAY_SIZE(dev->desc); i++) { | |
1395 | gpiochip_unlock_as_irq(&dev->gc, i); | |
1396 | gpiochip_free_own_desc(dev->desc[i]); | |
1397 | } | |
1398 | ||
1399 | gpiochip_remove(&dev->gc); | |
e932d817 DB |
1400 | /* i2c_del_adapter has finished removing all i2c devices from our |
1401 | * adapter. Well behaved devices should no longer call our cp2112_xfer | |
1402 | * and should have waited for any pending calls to finish. It has also | |
1403 | * waited for device_unregister(&adap->dev) to complete. Therefore we | |
1404 | * can safely free our struct cp2112_device. | |
1405 | */ | |
1406 | hid_hw_close(hdev); | |
1407 | hid_hw_stop(hdev); | |
e932d817 DB |
1408 | } |
1409 | ||
1410 | static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report, | |
1411 | u8 *data, int size) | |
1412 | { | |
1413 | struct cp2112_device *dev = hid_get_drvdata(hdev); | |
1414 | struct cp2112_xfer_status_report *xfer = (void *)data; | |
1415 | ||
1416 | switch (data[0]) { | |
1417 | case CP2112_TRANSFER_STATUS_RESPONSE: | |
1418 | hid_dbg(hdev, "xfer status: %02x %02x %04x %04x\n", | |
1419 | xfer->status0, xfer->status1, | |
1420 | be16_to_cpu(xfer->retries), be16_to_cpu(xfer->length)); | |
1421 | ||
1422 | switch (xfer->status0) { | |
1423 | case STATUS0_IDLE: | |
1424 | dev->xfer_status = -EAGAIN; | |
1425 | break; | |
1426 | case STATUS0_BUSY: | |
1427 | dev->xfer_status = -EBUSY; | |
1428 | break; | |
1429 | case STATUS0_COMPLETE: | |
1430 | dev->xfer_status = be16_to_cpu(xfer->length); | |
1431 | break; | |
1432 | case STATUS0_ERROR: | |
1433 | switch (xfer->status1) { | |
1434 | case STATUS1_TIMEOUT_NACK: | |
1435 | case STATUS1_TIMEOUT_BUS: | |
1436 | dev->xfer_status = -ETIMEDOUT; | |
1437 | break; | |
1438 | default: | |
1439 | dev->xfer_status = -EIO; | |
1440 | break; | |
1441 | } | |
1442 | break; | |
1443 | default: | |
1444 | dev->xfer_status = -EINVAL; | |
1445 | break; | |
1446 | } | |
1447 | ||
1448 | atomic_set(&dev->xfer_avail, 1); | |
1449 | break; | |
1450 | case CP2112_DATA_READ_RESPONSE: | |
1451 | hid_dbg(hdev, "read response: %02x %02x\n", data[1], data[2]); | |
1452 | ||
1453 | dev->read_length = data[2]; | |
1454 | if (dev->read_length > sizeof(dev->read_data)) | |
1455 | dev->read_length = sizeof(dev->read_data); | |
1456 | ||
1457 | memcpy(dev->read_data, &data[3], dev->read_length); | |
1458 | atomic_set(&dev->read_avail, 1); | |
1459 | break; | |
1460 | default: | |
1461 | hid_err(hdev, "unknown report\n"); | |
1462 | ||
1463 | return 0; | |
1464 | } | |
1465 | ||
1466 | wake_up_interruptible(&dev->wait); | |
1467 | return 1; | |
1468 | } | |
1469 | ||
1470 | static struct hid_driver cp2112_driver = { | |
1471 | .name = "cp2112", | |
1472 | .id_table = cp2112_devices, | |
1473 | .probe = cp2112_probe, | |
1474 | .remove = cp2112_remove, | |
1475 | .raw_event = cp2112_raw_event, | |
1476 | }; | |
1477 | ||
1478 | module_hid_driver(cp2112_driver); | |
1479 | MODULE_DESCRIPTION("Silicon Labs HID USB to SMBus master bridge"); | |
1480 | MODULE_AUTHOR("David Barksdale <dbarksdale@uplogix.com>"); | |
1481 | MODULE_LICENSE("GPL"); | |
1482 |