1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * MCP2221A - Microchip USB to I2C Host Protocol Bridge |
4 | * |
5 | * Copyright (c) 2020, Rishi Gupta <gupt21@gmail.com> |
6 | * |
7 | * Datasheet: https://ww1.microchip.com/downloads/en/DeviceDoc/20005565B.pdf |
8 | */ |
9 | |
10 | #include <linux/module.h> |
11 | #include <linux/err.h> |
12 | #include <linux/mutex.h> |
13 | #include <linux/bitfield.h> |
14 | #include <linux/completion.h> |
15 | #include <linux/delay.h> |
16 | #include <linux/hid.h> |
17 | #include <linux/hidraw.h> |
18 | #include <linux/i2c.h> |
19 | #include <linux/gpio/driver.h> |
20 | #include <linux/iio/iio.h> |
21 | #include "hid-ids.h" |
22 | |
23 | /* Commands codes in a raw output report */ |
24 | enum { |
25 | MCP2221_I2C_WR_DATA = 0x90, |
26 | MCP2221_I2C_WR_NO_STOP = 0x94, |
27 | MCP2221_I2C_RD_DATA = 0x91, |
28 | MCP2221_I2C_RD_RPT_START = 0x93, |
29 | MCP2221_I2C_GET_DATA = 0x40, |
30 | MCP2221_I2C_PARAM_OR_STATUS = 0x10, |
31 | MCP2221_I2C_SET_SPEED = 0x20, |
32 | MCP2221_I2C_CANCEL = 0x10, |
33 | MCP2221_GPIO_SET = 0x50, |
34 | MCP2221_GPIO_GET = 0x51, |
35 | MCP2221_SET_SRAM_SETTINGS = 0x60, |
36 | MCP2221_GET_SRAM_SETTINGS = 0x61, |
37 | MCP2221_READ_FLASH_DATA = 0xb0, |
38 | }; |
39 | |
40 | /* Response codes in a raw input report */ |
41 | enum { |
42 | MCP2221_SUCCESS = 0x00, |
43 | MCP2221_I2C_ENG_BUSY = 0x01, |
44 | MCP2221_I2C_START_TOUT = 0x12, |
45 | MCP2221_I2C_STOP_TOUT = 0x62, |
46 | MCP2221_I2C_WRADDRL_TOUT = 0x23, |
47 | MCP2221_I2C_WRDATA_TOUT = 0x44, |
48 | MCP2221_I2C_WRADDRL_NACK = 0x25, |
49 | MCP2221_I2C_MASK_ADDR_NACK = 0x40, |
50 | MCP2221_I2C_WRADDRL_SEND = 0x21, |
51 | MCP2221_I2C_ADDR_NACK = 0x25, |
52 | MCP2221_I2C_READ_PARTIAL = 0x54, |
53 | MCP2221_I2C_READ_COMPL = 0x55, |
54 | MCP2221_ALT_F_NOT_GPIOV = 0xEE, |
55 | MCP2221_ALT_F_NOT_GPIOD = 0xEF, |
56 | }; |
57 | |
58 | /* MCP GPIO direction encoding */ |
59 | enum { |
60 | MCP2221_DIR_OUT = 0x00, |
61 | MCP2221_DIR_IN = 0x01, |
62 | }; |
63 | |
64 | #define MCP_NGPIO 4 |
65 | |
66 | /* MCP GPIO set command layout */ |
67 | struct mcp_set_gpio { |
68 | u8 cmd; |
69 | u8 dummy; |
70 | struct { |
71 | u8 change_value; |
72 | u8 value; |
73 | u8 change_direction; |
74 | u8 direction; |
75 | } gpio[MCP_NGPIO]; |
76 | } __packed; |
77 | |
78 | /* MCP GPIO get command layout */ |
79 | struct mcp_get_gpio { |
80 | u8 cmd; |
81 | u8 dummy; |
82 | struct { |
83 | u8 value; |
84 | u8 direction; |
85 | } gpio[MCP_NGPIO]; |
86 | } __packed; |
87 | |
88 | /* |
89 | * There is no way to distinguish responses. Therefore next command |
90 | * is sent only after response to previous has been received. Mutex |
91 | * lock is used for this purpose mainly. |
92 | */ |
93 | struct mcp2221 { |
94 | struct hid_device *hdev; |
95 | struct i2c_adapter adapter; |
96 | struct mutex lock; |
97 | struct completion wait_in_report; |
98 | struct delayed_work init_work; |
99 | u8 *rxbuf; |
100 | u8 txbuf[64]; |
101 | int rxbuf_idx; |
102 | int status; |
103 | u8 cur_i2c_clk_div; |
104 | struct gpio_chip *gc; |
105 | u8 gp_idx; |
106 | u8 gpio_dir; |
107 | u8 mode[4]; |
108 | #if IS_REACHABLE(CONFIG_IIO) |
109 | struct iio_chan_spec iio_channels[3]; |
110 | u16 adc_values[3]; |
111 | u8 adc_scale; |
112 | u8 dac_value; |
113 | u16 dac_scale; |
114 | #endif |
115 | }; |
116 | |
117 | struct mcp2221_iio { |
118 | struct mcp2221 *mcp; |
119 | }; |
120 | |
121 | /* |
122 | * Default i2c bus clock frequency 400 kHz. Modify this if you |
123 | * want to set some other frequency (min 50 kHz - max 400 kHz). |
124 | */ |
125 | static uint i2c_clk_freq = 400; |
126 | |
127 | /* Synchronously send output report to the device */ |
128 | static int mcp_send_report(struct mcp2221 *mcp, |
129 | u8 *out_report, size_t len) |
130 | { |
131 | u8 *buf; |
132 | int ret; |
133 | |
134 | buf = kmemdup(p: out_report, size: len, GFP_KERNEL); |
135 | if (!buf) |
136 | return -ENOMEM; |
137 | |
138 | /* mcp2221 uses interrupt endpoint for out reports */ |
139 | ret = hid_hw_output_report(hdev: mcp->hdev, buf, len); |
140 | kfree(objp: buf); |
141 | |
142 | if (ret < 0) |
143 | return ret; |
144 | return 0; |
145 | } |
146 | |
147 | /* |
148 | * Send o/p report to the device and wait for i/p report to be |
149 | * received from the device. If the device does not respond, |
150 | * we timeout. |
151 | */ |
152 | static int mcp_send_data_req_status(struct mcp2221 *mcp, |
153 | u8 *out_report, int len) |
154 | { |
155 | int ret; |
156 | unsigned long t; |
157 | |
158 | reinit_completion(x: &mcp->wait_in_report); |
159 | |
160 | ret = mcp_send_report(mcp, out_report, len); |
161 | if (ret) |
162 | return ret; |
163 | |
164 | t = wait_for_completion_timeout(x: &mcp->wait_in_report, |
165 | timeout: msecs_to_jiffies(m: 4000)); |
166 | if (!t) |
167 | return -ETIMEDOUT; |
168 | |
169 | return mcp->status; |
170 | } |
171 | |
172 | /* Check pass/fail for actual communication with i2c slave */ |
173 | static int mcp_chk_last_cmd_status(struct mcp2221 *mcp) |
174 | { |
175 | memset(mcp->txbuf, 0, 8); |
176 | mcp->txbuf[0] = MCP2221_I2C_PARAM_OR_STATUS; |
177 | |
178 | return mcp_send_data_req_status(mcp, out_report: mcp->txbuf, len: 8); |
179 | } |
180 | |
181 | /* Cancels last command releasing i2c bus just in case occupied */ |
182 | static int mcp_cancel_last_cmd(struct mcp2221 *mcp) |
183 | { |
184 | memset(mcp->txbuf, 0, 8); |
185 | mcp->txbuf[0] = MCP2221_I2C_PARAM_OR_STATUS; |
186 | mcp->txbuf[2] = MCP2221_I2C_CANCEL; |
187 | |
188 | return mcp_send_data_req_status(mcp, out_report: mcp->txbuf, len: 8); |
189 | } |
190 | |
191 | /* Check if the last command succeeded or failed and return the result. |
192 | * If the command did fail, cancel that command which will free the i2c bus. |
193 | */ |
194 | static int mcp_chk_last_cmd_status_free_bus(struct mcp2221 *mcp) |
195 | { |
196 | int ret; |
197 | |
198 | ret = mcp_chk_last_cmd_status(mcp); |
199 | if (ret) { |
200 | /* The last command was a failure. |
201 | * Send a cancel which will also free the bus. |
202 | */ |
203 | usleep_range(min: 980, max: 1000); |
204 | mcp_cancel_last_cmd(mcp); |
205 | } |
206 | |
207 | return ret; |
208 | } |
209 | |
210 | static int mcp_set_i2c_speed(struct mcp2221 *mcp) |
211 | { |
212 | int ret; |
213 | |
214 | memset(mcp->txbuf, 0, 8); |
215 | mcp->txbuf[0] = MCP2221_I2C_PARAM_OR_STATUS; |
216 | mcp->txbuf[3] = MCP2221_I2C_SET_SPEED; |
217 | mcp->txbuf[4] = mcp->cur_i2c_clk_div; |
218 | |
219 | ret = mcp_send_data_req_status(mcp, out_report: mcp->txbuf, len: 8); |
220 | if (ret) { |
221 | /* Small delay is needed here */ |
222 | usleep_range(min: 980, max: 1000); |
223 | mcp_cancel_last_cmd(mcp); |
224 | } |
225 | |
226 | return 0; |
227 | } |
228 | |
229 | /* |
230 | * An output report can contain minimum 1 and maximum 60 user data |
231 | * bytes. If the number of data bytes is more then 60, we send it |
232 | * in chunks of 60 bytes. Last chunk may contain exactly 60 or less |
233 | * bytes. Total number of bytes is informed in very first report to |
234 | * mcp2221, from that point onwards it first collect all the data |
235 | * from host and then send to i2c slave device. |
236 | */ |
237 | static int mcp_i2c_write(struct mcp2221 *mcp, |
238 | struct i2c_msg *msg, int type, u8 last_status) |
239 | { |
240 | int ret, len, idx, sent; |
241 | |
242 | idx = 0; |
243 | sent = 0; |
244 | if (msg->len < 60) |
245 | len = msg->len; |
246 | else |
247 | len = 60; |
248 | |
249 | do { |
250 | mcp->txbuf[0] = type; |
251 | mcp->txbuf[1] = msg->len & 0xff; |
252 | mcp->txbuf[2] = msg->len >> 8; |
253 | mcp->txbuf[3] = (u8)(msg->addr << 1); |
254 | |
255 | memcpy(&mcp->txbuf[4], &msg->buf[idx], len); |
256 | |
257 | ret = mcp_send_data_req_status(mcp, out_report: mcp->txbuf, len: len + 4); |
258 | if (ret) |
259 | return ret; |
260 | |
261 | usleep_range(min: 980, max: 1000); |
262 | |
263 | if (last_status) { |
264 | ret = mcp_chk_last_cmd_status_free_bus(mcp); |
265 | if (ret) |
266 | return ret; |
267 | } |
268 | |
269 | sent = sent + len; |
270 | if (sent >= msg->len) |
271 | break; |
272 | |
273 | idx = idx + len; |
274 | if ((msg->len - sent) < 60) |
275 | len = msg->len - sent; |
276 | else |
277 | len = 60; |
278 | |
279 | /* |
280 | * Testing shows delay is needed between successive writes |
281 | * otherwise next write fails on first-try from i2c core. |
282 | * This value is obtained through automated stress testing. |
283 | */ |
284 | usleep_range(min: 980, max: 1000); |
285 | } while (len > 0); |
286 | |
287 | return ret; |
288 | } |
289 | |
290 | /* |
291 | * Device reads all data (0 - 65535 bytes) from i2c slave device and |
292 | * stores it in device itself. This data is read back from device to |
293 | * host in multiples of 60 bytes using input reports. |
294 | */ |
295 | static int mcp_i2c_smbus_read(struct mcp2221 *mcp, |
296 | struct i2c_msg *msg, int type, u16 smbus_addr, |
297 | u8 smbus_len, u8 *smbus_buf) |
298 | { |
299 | int ret; |
300 | u16 total_len; |
301 | int retries = 0; |
302 | |
303 | mcp->txbuf[0] = type; |
304 | if (msg) { |
305 | mcp->txbuf[1] = msg->len & 0xff; |
306 | mcp->txbuf[2] = msg->len >> 8; |
307 | mcp->txbuf[3] = (u8)(msg->addr << 1); |
308 | total_len = msg->len; |
309 | mcp->rxbuf = msg->buf; |
310 | } else { |
311 | mcp->txbuf[1] = smbus_len; |
312 | mcp->txbuf[2] = 0; |
313 | mcp->txbuf[3] = (u8)(smbus_addr << 1); |
314 | total_len = smbus_len; |
315 | mcp->rxbuf = smbus_buf; |
316 | } |
317 | |
318 | ret = mcp_send_data_req_status(mcp, out_report: mcp->txbuf, len: 4); |
319 | if (ret) |
320 | return ret; |
321 | |
322 | mcp->rxbuf_idx = 0; |
323 | |
324 | do { |
325 | /* Wait for the data to be read by the device */ |
326 | usleep_range(min: 980, max: 1000); |
327 | |
328 | memset(mcp->txbuf, 0, 4); |
329 | mcp->txbuf[0] = MCP2221_I2C_GET_DATA; |
330 | |
331 | ret = mcp_send_data_req_status(mcp, out_report: mcp->txbuf, len: 1); |
332 | if (ret) { |
333 | if (retries < 5) { |
334 | /* The data wasn't ready to read. |
335 | * Wait a bit longer and try again. |
336 | */ |
337 | usleep_range(min: 90, max: 100); |
338 | retries++; |
339 | } else { |
340 | return ret; |
341 | } |
342 | } else { |
343 | retries = 0; |
344 | } |
345 | } while (mcp->rxbuf_idx < total_len); |
346 | |
347 | usleep_range(min: 980, max: 1000); |
348 | ret = mcp_chk_last_cmd_status_free_bus(mcp); |
349 | |
350 | return ret; |
351 | } |
352 | |
353 | static int mcp_i2c_xfer(struct i2c_adapter *adapter, |
354 | struct i2c_msg msgs[], int num) |
355 | { |
356 | int ret; |
357 | struct mcp2221 *mcp = i2c_get_adapdata(adap: adapter); |
358 | |
359 | hid_hw_power(hdev: mcp->hdev, PM_HINT_FULLON); |
360 | |
361 | mutex_lock(&mcp->lock); |
362 | |
363 | if (num == 1) { |
364 | if (msgs->flags & I2C_M_RD) { |
365 | ret = mcp_i2c_smbus_read(mcp, msg: msgs, type: MCP2221_I2C_RD_DATA, |
366 | smbus_addr: 0, smbus_len: 0, NULL); |
367 | } else { |
368 | ret = mcp_i2c_write(mcp, msg: msgs, type: MCP2221_I2C_WR_DATA, last_status: 1); |
369 | } |
370 | if (ret) |
371 | goto exit; |
372 | ret = num; |
373 | } else if (num == 2) { |
374 | /* Ex transaction; send reg address and read its contents */ |
375 | if (msgs[0].addr == msgs[1].addr && |
376 | !(msgs[0].flags & I2C_M_RD) && |
377 | (msgs[1].flags & I2C_M_RD)) { |
378 | |
379 | ret = mcp_i2c_write(mcp, msg: &msgs[0], |
380 | type: MCP2221_I2C_WR_NO_STOP, last_status: 0); |
381 | if (ret) |
382 | goto exit; |
383 | |
384 | ret = mcp_i2c_smbus_read(mcp, msg: &msgs[1], |
385 | type: MCP2221_I2C_RD_RPT_START, |
386 | smbus_addr: 0, smbus_len: 0, NULL); |
387 | if (ret) |
388 | goto exit; |
389 | ret = num; |
390 | } else { |
391 | dev_err(&adapter->dev, |
392 | "unsupported multi-msg i2c transaction\n" ); |
393 | ret = -EOPNOTSUPP; |
394 | } |
395 | } else { |
396 | dev_err(&adapter->dev, |
397 | "unsupported multi-msg i2c transaction\n" ); |
398 | ret = -EOPNOTSUPP; |
399 | } |
400 | |
401 | exit: |
402 | hid_hw_power(hdev: mcp->hdev, PM_HINT_NORMAL); |
403 | mutex_unlock(lock: &mcp->lock); |
404 | return ret; |
405 | } |
406 | |
407 | static int mcp_smbus_write(struct mcp2221 *mcp, u16 addr, |
408 | u8 command, u8 *buf, u8 len, int type, |
409 | u8 last_status) |
410 | { |
411 | int data_len, ret; |
412 | |
413 | mcp->txbuf[0] = type; |
414 | mcp->txbuf[1] = len + 1; /* 1 is due to command byte itself */ |
415 | mcp->txbuf[2] = 0; |
416 | mcp->txbuf[3] = (u8)(addr << 1); |
417 | mcp->txbuf[4] = command; |
418 | |
419 | switch (len) { |
420 | case 0: |
421 | data_len = 5; |
422 | break; |
423 | case 1: |
424 | mcp->txbuf[5] = buf[0]; |
425 | data_len = 6; |
426 | break; |
427 | case 2: |
428 | mcp->txbuf[5] = buf[0]; |
429 | mcp->txbuf[6] = buf[1]; |
430 | data_len = 7; |
431 | break; |
432 | default: |
433 | if (len > I2C_SMBUS_BLOCK_MAX) |
434 | return -EINVAL; |
435 | |
436 | memcpy(&mcp->txbuf[5], buf, len); |
437 | data_len = len + 5; |
438 | } |
439 | |
440 | ret = mcp_send_data_req_status(mcp, out_report: mcp->txbuf, len: data_len); |
441 | if (ret) |
442 | return ret; |
443 | |
444 | if (last_status) { |
445 | usleep_range(min: 980, max: 1000); |
446 | |
447 | ret = mcp_chk_last_cmd_status_free_bus(mcp); |
448 | } |
449 | |
450 | return ret; |
451 | } |
452 | |
453 | static int mcp_smbus_xfer(struct i2c_adapter *adapter, u16 addr, |
454 | unsigned short flags, char read_write, |
455 | u8 command, int size, |
456 | union i2c_smbus_data *data) |
457 | { |
458 | int ret; |
459 | struct mcp2221 *mcp = i2c_get_adapdata(adap: adapter); |
460 | |
461 | hid_hw_power(hdev: mcp->hdev, PM_HINT_FULLON); |
462 | |
463 | mutex_lock(&mcp->lock); |
464 | |
465 | switch (size) { |
466 | |
467 | case I2C_SMBUS_QUICK: |
468 | if (read_write == I2C_SMBUS_READ) |
469 | ret = mcp_i2c_smbus_read(mcp, NULL, type: MCP2221_I2C_RD_DATA, |
470 | smbus_addr: addr, smbus_len: 0, smbus_buf: &data->byte); |
471 | else |
472 | ret = mcp_smbus_write(mcp, addr, command, NULL, |
473 | len: 0, type: MCP2221_I2C_WR_DATA, last_status: 1); |
474 | break; |
475 | case I2C_SMBUS_BYTE: |
476 | if (read_write == I2C_SMBUS_READ) |
477 | ret = mcp_i2c_smbus_read(mcp, NULL, type: MCP2221_I2C_RD_DATA, |
478 | smbus_addr: addr, smbus_len: 1, smbus_buf: &data->byte); |
479 | else |
480 | ret = mcp_smbus_write(mcp, addr, command, NULL, |
481 | len: 0, type: MCP2221_I2C_WR_DATA, last_status: 1); |
482 | break; |
483 | case I2C_SMBUS_BYTE_DATA: |
484 | if (read_write == I2C_SMBUS_READ) { |
485 | ret = mcp_smbus_write(mcp, addr, command, NULL, |
486 | len: 0, type: MCP2221_I2C_WR_NO_STOP, last_status: 0); |
487 | if (ret) |
488 | goto exit; |
489 | |
490 | ret = mcp_i2c_smbus_read(mcp, NULL, |
491 | type: MCP2221_I2C_RD_RPT_START, |
492 | smbus_addr: addr, smbus_len: 1, smbus_buf: &data->byte); |
493 | } else { |
494 | ret = mcp_smbus_write(mcp, addr, command, buf: &data->byte, |
495 | len: 1, type: MCP2221_I2C_WR_DATA, last_status: 1); |
496 | } |
497 | break; |
498 | case I2C_SMBUS_WORD_DATA: |
499 | if (read_write == I2C_SMBUS_READ) { |
500 | ret = mcp_smbus_write(mcp, addr, command, NULL, |
501 | len: 0, type: MCP2221_I2C_WR_NO_STOP, last_status: 0); |
502 | if (ret) |
503 | goto exit; |
504 | |
505 | ret = mcp_i2c_smbus_read(mcp, NULL, |
506 | type: MCP2221_I2C_RD_RPT_START, |
507 | smbus_addr: addr, smbus_len: 2, smbus_buf: (u8 *)&data->word); |
508 | } else { |
509 | ret = mcp_smbus_write(mcp, addr, command, |
510 | buf: (u8 *)&data->word, len: 2, |
511 | type: MCP2221_I2C_WR_DATA, last_status: 1); |
512 | } |
513 | break; |
514 | case I2C_SMBUS_BLOCK_DATA: |
515 | if (read_write == I2C_SMBUS_READ) { |
516 | ret = mcp_smbus_write(mcp, addr, command, NULL, |
517 | len: 0, type: MCP2221_I2C_WR_NO_STOP, last_status: 1); |
518 | if (ret) |
519 | goto exit; |
520 | |
521 | mcp->rxbuf_idx = 0; |
522 | mcp->rxbuf = data->block; |
523 | mcp->txbuf[0] = MCP2221_I2C_GET_DATA; |
524 | ret = mcp_send_data_req_status(mcp, out_report: mcp->txbuf, len: 1); |
525 | if (ret) |
526 | goto exit; |
527 | } else { |
528 | if (!data->block[0]) { |
529 | ret = -EINVAL; |
530 | goto exit; |
531 | } |
532 | ret = mcp_smbus_write(mcp, addr, command, buf: data->block, |
533 | len: data->block[0] + 1, |
534 | type: MCP2221_I2C_WR_DATA, last_status: 1); |
535 | } |
536 | break; |
537 | case I2C_SMBUS_I2C_BLOCK_DATA: |
538 | if (read_write == I2C_SMBUS_READ) { |
539 | ret = mcp_smbus_write(mcp, addr, command, NULL, |
540 | len: 0, type: MCP2221_I2C_WR_NO_STOP, last_status: 1); |
541 | if (ret) |
542 | goto exit; |
543 | |
544 | mcp->rxbuf_idx = 0; |
545 | mcp->rxbuf = data->block; |
546 | mcp->txbuf[0] = MCP2221_I2C_GET_DATA; |
547 | ret = mcp_send_data_req_status(mcp, out_report: mcp->txbuf, len: 1); |
548 | if (ret) |
549 | goto exit; |
550 | } else { |
551 | if (!data->block[0]) { |
552 | ret = -EINVAL; |
553 | goto exit; |
554 | } |
555 | ret = mcp_smbus_write(mcp, addr, command, |
556 | buf: &data->block[1], len: data->block[0], |
557 | type: MCP2221_I2C_WR_DATA, last_status: 1); |
558 | } |
559 | break; |
560 | case I2C_SMBUS_PROC_CALL: |
561 | ret = mcp_smbus_write(mcp, addr, command, |
562 | buf: (u8 *)&data->word, |
563 | len: 2, type: MCP2221_I2C_WR_NO_STOP, last_status: 0); |
564 | if (ret) |
565 | goto exit; |
566 | |
567 | ret = mcp_i2c_smbus_read(mcp, NULL, |
568 | type: MCP2221_I2C_RD_RPT_START, |
569 | smbus_addr: addr, smbus_len: 2, smbus_buf: (u8 *)&data->word); |
570 | break; |
571 | case I2C_SMBUS_BLOCK_PROC_CALL: |
572 | ret = mcp_smbus_write(mcp, addr, command, buf: data->block, |
573 | len: data->block[0] + 1, |
574 | type: MCP2221_I2C_WR_NO_STOP, last_status: 0); |
575 | if (ret) |
576 | goto exit; |
577 | |
578 | ret = mcp_i2c_smbus_read(mcp, NULL, |
579 | type: MCP2221_I2C_RD_RPT_START, |
580 | smbus_addr: addr, I2C_SMBUS_BLOCK_MAX, |
581 | smbus_buf: data->block); |
582 | break; |
583 | default: |
584 | dev_err(&mcp->adapter.dev, |
585 | "unsupported smbus transaction size:%d\n" , size); |
586 | ret = -EOPNOTSUPP; |
587 | } |
588 | |
589 | exit: |
590 | hid_hw_power(hdev: mcp->hdev, PM_HINT_NORMAL); |
591 | mutex_unlock(lock: &mcp->lock); |
592 | return ret; |
593 | } |
594 | |
595 | static u32 mcp_i2c_func(struct i2c_adapter *adapter) |
596 | { |
597 | return I2C_FUNC_I2C | |
598 | I2C_FUNC_SMBUS_READ_BLOCK_DATA | |
599 | I2C_FUNC_SMBUS_BLOCK_PROC_CALL | |
600 | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_PEC); |
601 | } |
602 | |
603 | static const struct i2c_algorithm mcp_i2c_algo = { |
604 | .master_xfer = mcp_i2c_xfer, |
605 | .smbus_xfer = mcp_smbus_xfer, |
606 | .functionality = mcp_i2c_func, |
607 | }; |
608 | |
609 | #if IS_REACHABLE(CONFIG_GPIOLIB) |
610 | static int mcp_gpio_get(struct gpio_chip *gc, |
611 | unsigned int offset) |
612 | { |
613 | int ret; |
614 | struct mcp2221 *mcp = gpiochip_get_data(gc); |
615 | |
616 | mcp->txbuf[0] = MCP2221_GPIO_GET; |
617 | |
618 | mcp->gp_idx = offsetof(struct mcp_get_gpio, gpio[offset]); |
619 | |
620 | mutex_lock(&mcp->lock); |
621 | ret = mcp_send_data_req_status(mcp, out_report: mcp->txbuf, len: 1); |
622 | mutex_unlock(lock: &mcp->lock); |
623 | |
624 | return ret; |
625 | } |
626 | |
627 | static void mcp_gpio_set(struct gpio_chip *gc, |
628 | unsigned int offset, int value) |
629 | { |
630 | struct mcp2221 *mcp = gpiochip_get_data(gc); |
631 | |
632 | memset(mcp->txbuf, 0, 18); |
633 | mcp->txbuf[0] = MCP2221_GPIO_SET; |
634 | |
635 | mcp->gp_idx = offsetof(struct mcp_set_gpio, gpio[offset].value); |
636 | |
637 | mcp->txbuf[mcp->gp_idx - 1] = 1; |
638 | mcp->txbuf[mcp->gp_idx] = !!value; |
639 | |
640 | mutex_lock(&mcp->lock); |
641 | mcp_send_data_req_status(mcp, out_report: mcp->txbuf, len: 18); |
642 | mutex_unlock(lock: &mcp->lock); |
643 | } |
644 | |
645 | static int mcp_gpio_dir_set(struct mcp2221 *mcp, |
646 | unsigned int offset, u8 val) |
647 | { |
648 | memset(mcp->txbuf, 0, 18); |
649 | mcp->txbuf[0] = MCP2221_GPIO_SET; |
650 | |
651 | mcp->gp_idx = offsetof(struct mcp_set_gpio, gpio[offset].direction); |
652 | |
653 | mcp->txbuf[mcp->gp_idx - 1] = 1; |
654 | mcp->txbuf[mcp->gp_idx] = val; |
655 | |
656 | return mcp_send_data_req_status(mcp, out_report: mcp->txbuf, len: 18); |
657 | } |
658 | |
659 | static int mcp_gpio_direction_input(struct gpio_chip *gc, |
660 | unsigned int offset) |
661 | { |
662 | int ret; |
663 | struct mcp2221 *mcp = gpiochip_get_data(gc); |
664 | |
665 | mutex_lock(&mcp->lock); |
666 | ret = mcp_gpio_dir_set(mcp, offset, val: MCP2221_DIR_IN); |
667 | mutex_unlock(lock: &mcp->lock); |
668 | |
669 | return ret; |
670 | } |
671 | |
672 | static int mcp_gpio_direction_output(struct gpio_chip *gc, |
673 | unsigned int offset, int value) |
674 | { |
675 | int ret; |
676 | struct mcp2221 *mcp = gpiochip_get_data(gc); |
677 | |
678 | mutex_lock(&mcp->lock); |
679 | ret = mcp_gpio_dir_set(mcp, offset, val: MCP2221_DIR_OUT); |
680 | mutex_unlock(lock: &mcp->lock); |
681 | |
682 | /* Can't configure as output, bailout early */ |
683 | if (ret) |
684 | return ret; |
685 | |
686 | mcp_gpio_set(gc, offset, value); |
687 | |
688 | return 0; |
689 | } |
690 | |
691 | static int mcp_gpio_get_direction(struct gpio_chip *gc, |
692 | unsigned int offset) |
693 | { |
694 | int ret; |
695 | struct mcp2221 *mcp = gpiochip_get_data(gc); |
696 | |
697 | mcp->txbuf[0] = MCP2221_GPIO_GET; |
698 | |
699 | mcp->gp_idx = offsetof(struct mcp_get_gpio, gpio[offset]); |
700 | |
701 | mutex_lock(&mcp->lock); |
702 | ret = mcp_send_data_req_status(mcp, out_report: mcp->txbuf, len: 1); |
703 | mutex_unlock(lock: &mcp->lock); |
704 | |
705 | if (ret) |
706 | return ret; |
707 | |
708 | if (mcp->gpio_dir == MCP2221_DIR_IN) |
709 | return GPIO_LINE_DIRECTION_IN; |
710 | |
711 | return GPIO_LINE_DIRECTION_OUT; |
712 | } |
713 | #endif |
714 | |
715 | /* Gives current state of i2c engine inside mcp2221 */ |
716 | static int mcp_get_i2c_eng_state(struct mcp2221 *mcp, |
717 | u8 *data, u8 idx) |
718 | { |
719 | int ret; |
720 | |
721 | switch (data[idx]) { |
722 | case MCP2221_I2C_WRADDRL_NACK: |
723 | case MCP2221_I2C_WRADDRL_SEND: |
724 | ret = -ENXIO; |
725 | break; |
726 | case MCP2221_I2C_START_TOUT: |
727 | case MCP2221_I2C_STOP_TOUT: |
728 | case MCP2221_I2C_WRADDRL_TOUT: |
729 | case MCP2221_I2C_WRDATA_TOUT: |
730 | ret = -ETIMEDOUT; |
731 | break; |
732 | case MCP2221_I2C_ENG_BUSY: |
733 | ret = -EAGAIN; |
734 | break; |
735 | case MCP2221_SUCCESS: |
736 | ret = 0x00; |
737 | break; |
738 | default: |
739 | ret = -EIO; |
740 | } |
741 | |
742 | return ret; |
743 | } |
744 | |
745 | /* |
746 | * MCP2221 uses interrupt endpoint for input reports. This function |
747 | * is called by HID layer when it receives i/p report from mcp2221, |
748 | * which is actually a response to the previously sent command. |
749 | * |
750 | * MCP2221A firmware specific return codes are parsed and 0 or |
751 | * appropriate negative error code is returned. Delayed response |
752 | * results in timeout error and stray reponses results in -EIO. |
753 | */ |
754 | static int mcp2221_raw_event(struct hid_device *hdev, |
755 | struct hid_report *report, u8 *data, int size) |
756 | { |
757 | u8 *buf; |
758 | struct mcp2221 *mcp = hid_get_drvdata(hdev); |
759 | |
760 | switch (data[0]) { |
761 | |
762 | case MCP2221_I2C_WR_DATA: |
763 | case MCP2221_I2C_WR_NO_STOP: |
764 | case MCP2221_I2C_RD_DATA: |
765 | case MCP2221_I2C_RD_RPT_START: |
766 | switch (data[1]) { |
767 | case MCP2221_SUCCESS: |
768 | mcp->status = 0; |
769 | break; |
770 | default: |
771 | mcp->status = mcp_get_i2c_eng_state(mcp, data, idx: 2); |
772 | } |
773 | complete(&mcp->wait_in_report); |
774 | break; |
775 | |
776 | case MCP2221_I2C_PARAM_OR_STATUS: |
777 | switch (data[1]) { |
778 | case MCP2221_SUCCESS: |
779 | if ((mcp->txbuf[3] == MCP2221_I2C_SET_SPEED) && |
780 | (data[3] != MCP2221_I2C_SET_SPEED)) { |
781 | mcp->status = -EAGAIN; |
782 | break; |
783 | } |
784 | if (data[20] & MCP2221_I2C_MASK_ADDR_NACK) { |
785 | mcp->status = -ENXIO; |
786 | break; |
787 | } |
788 | mcp->status = mcp_get_i2c_eng_state(mcp, data, idx: 8); |
789 | #if IS_REACHABLE(CONFIG_IIO) |
790 | memcpy(&mcp->adc_values, &data[50], sizeof(mcp->adc_values)); |
791 | #endif |
792 | break; |
793 | default: |
794 | mcp->status = -EIO; |
795 | } |
796 | complete(&mcp->wait_in_report); |
797 | break; |
798 | |
799 | case MCP2221_I2C_GET_DATA: |
800 | switch (data[1]) { |
801 | case MCP2221_SUCCESS: |
802 | if (data[2] == MCP2221_I2C_ADDR_NACK) { |
803 | mcp->status = -ENXIO; |
804 | break; |
805 | } |
806 | if (!mcp_get_i2c_eng_state(mcp, data, idx: 2) |
807 | && (data[3] == 0)) { |
808 | mcp->status = 0; |
809 | break; |
810 | } |
811 | if (data[3] == 127) { |
812 | mcp->status = -EIO; |
813 | break; |
814 | } |
815 | if (data[2] == MCP2221_I2C_READ_COMPL || |
816 | data[2] == MCP2221_I2C_READ_PARTIAL) { |
817 | buf = mcp->rxbuf; |
818 | memcpy(&buf[mcp->rxbuf_idx], &data[4], data[3]); |
819 | mcp->rxbuf_idx = mcp->rxbuf_idx + data[3]; |
820 | mcp->status = 0; |
821 | break; |
822 | } |
823 | mcp->status = -EIO; |
824 | break; |
825 | default: |
826 | mcp->status = -EIO; |
827 | } |
828 | complete(&mcp->wait_in_report); |
829 | break; |
830 | |
831 | case MCP2221_GPIO_GET: |
832 | switch (data[1]) { |
833 | case MCP2221_SUCCESS: |
834 | if ((data[mcp->gp_idx] == MCP2221_ALT_F_NOT_GPIOV) || |
835 | (data[mcp->gp_idx + 1] == MCP2221_ALT_F_NOT_GPIOD)) { |
836 | mcp->status = -ENOENT; |
837 | } else { |
838 | mcp->status = !!data[mcp->gp_idx]; |
839 | mcp->gpio_dir = data[mcp->gp_idx + 1]; |
840 | } |
841 | break; |
842 | default: |
843 | mcp->status = -EAGAIN; |
844 | } |
845 | complete(&mcp->wait_in_report); |
846 | break; |
847 | |
848 | case MCP2221_GPIO_SET: |
849 | switch (data[1]) { |
850 | case MCP2221_SUCCESS: |
851 | if ((data[mcp->gp_idx] == MCP2221_ALT_F_NOT_GPIOV) || |
852 | (data[mcp->gp_idx - 1] == MCP2221_ALT_F_NOT_GPIOV)) { |
853 | mcp->status = -ENOENT; |
854 | } else { |
855 | mcp->status = 0; |
856 | } |
857 | break; |
858 | default: |
859 | mcp->status = -EAGAIN; |
860 | } |
861 | complete(&mcp->wait_in_report); |
862 | break; |
863 | |
864 | case MCP2221_SET_SRAM_SETTINGS: |
865 | switch (data[1]) { |
866 | case MCP2221_SUCCESS: |
867 | mcp->status = 0; |
868 | break; |
869 | default: |
870 | mcp->status = -EAGAIN; |
871 | } |
872 | complete(&mcp->wait_in_report); |
873 | break; |
874 | |
875 | case MCP2221_GET_SRAM_SETTINGS: |
876 | switch (data[1]) { |
877 | case MCP2221_SUCCESS: |
878 | memcpy(&mcp->mode, &data[22], 4); |
879 | #if IS_REACHABLE(CONFIG_IIO) |
880 | mcp->dac_value = data[6] & GENMASK(4, 0); |
881 | #endif |
882 | mcp->status = 0; |
883 | break; |
884 | default: |
885 | mcp->status = -EAGAIN; |
886 | } |
887 | complete(&mcp->wait_in_report); |
888 | break; |
889 | |
890 | case MCP2221_READ_FLASH_DATA: |
891 | switch (data[1]) { |
892 | case MCP2221_SUCCESS: |
893 | mcp->status = 0; |
894 | |
895 | /* Only handles CHIP SETTINGS subpage currently */ |
896 | if (mcp->txbuf[1] != 0) { |
897 | mcp->status = -EIO; |
898 | break; |
899 | } |
900 | |
901 | #if IS_REACHABLE(CONFIG_IIO) |
902 | { |
903 | u8 tmp; |
904 | /* DAC scale value */ |
905 | tmp = FIELD_GET(GENMASK(7, 6), data[6]); |
906 | if ((data[6] & BIT(5)) && tmp) |
907 | mcp->dac_scale = tmp + 4; |
908 | else |
909 | mcp->dac_scale = 5; |
910 | |
911 | /* ADC scale value */ |
912 | tmp = FIELD_GET(GENMASK(4, 3), data[7]); |
913 | if ((data[7] & BIT(2)) && tmp) |
914 | mcp->adc_scale = tmp - 1; |
915 | else |
916 | mcp->adc_scale = 0; |
917 | } |
918 | #endif |
919 | |
920 | break; |
921 | default: |
922 | mcp->status = -EAGAIN; |
923 | } |
924 | complete(&mcp->wait_in_report); |
925 | break; |
926 | |
927 | default: |
928 | mcp->status = -EIO; |
929 | complete(&mcp->wait_in_report); |
930 | } |
931 | |
932 | return 1; |
933 | } |
934 | |
935 | /* Device resource managed function for HID unregistration */ |
936 | static void mcp2221_hid_unregister(void *ptr) |
937 | { |
938 | struct hid_device *hdev = ptr; |
939 | |
940 | hid_hw_close(hdev); |
941 | hid_hw_stop(hdev); |
942 | } |
943 | |
944 | /* This is needed to be sure hid_hw_stop() isn't called twice by the subsystem */ |
945 | static void mcp2221_remove(struct hid_device *hdev) |
946 | { |
947 | struct mcp2221 *mcp = hid_get_drvdata(hdev); |
948 | |
949 | cancel_delayed_work_sync(dwork: &mcp->init_work); |
950 | } |
951 | |
952 | #if IS_REACHABLE(CONFIG_IIO) |
953 | static int mcp2221_read_raw(struct iio_dev *indio_dev, |
954 | struct iio_chan_spec const *channel, int *val, |
955 | int *val2, long mask) |
956 | { |
957 | struct mcp2221_iio *priv = iio_priv(indio_dev); |
958 | struct mcp2221 *mcp = priv->mcp; |
959 | int ret; |
960 | |
961 | if (mask == IIO_CHAN_INFO_SCALE) { |
962 | if (channel->output) |
963 | *val = 1 << mcp->dac_scale; |
964 | else |
965 | *val = 1 << mcp->adc_scale; |
966 | |
967 | return IIO_VAL_INT; |
968 | } |
969 | |
970 | mutex_lock(&mcp->lock); |
971 | |
972 | if (channel->output) { |
973 | *val = mcp->dac_value; |
974 | ret = IIO_VAL_INT; |
975 | } else { |
976 | /* Read ADC values */ |
977 | ret = mcp_chk_last_cmd_status(mcp); |
978 | |
979 | if (!ret) { |
980 | *val = le16_to_cpu((__force __le16) mcp->adc_values[channel->address]); |
981 | if (*val >= BIT(10)) |
982 | ret = -EINVAL; |
983 | else |
984 | ret = IIO_VAL_INT; |
985 | } |
986 | } |
987 | |
988 | mutex_unlock(lock: &mcp->lock); |
989 | |
990 | return ret; |
991 | } |
992 | |
993 | static int mcp2221_write_raw(struct iio_dev *indio_dev, |
994 | struct iio_chan_spec const *chan, |
995 | int val, int val2, long mask) |
996 | { |
997 | struct mcp2221_iio *priv = iio_priv(indio_dev); |
998 | struct mcp2221 *mcp = priv->mcp; |
999 | int ret; |
1000 | |
1001 | if (val < 0 || val >= BIT(5)) |
1002 | return -EINVAL; |
1003 | |
1004 | mutex_lock(&mcp->lock); |
1005 | |
1006 | memset(mcp->txbuf, 0, 12); |
1007 | mcp->txbuf[0] = MCP2221_SET_SRAM_SETTINGS; |
1008 | mcp->txbuf[4] = BIT(7) | val; |
1009 | |
1010 | ret = mcp_send_data_req_status(mcp, out_report: mcp->txbuf, len: 12); |
1011 | if (!ret) |
1012 | mcp->dac_value = val; |
1013 | |
1014 | mutex_unlock(lock: &mcp->lock); |
1015 | |
1016 | return ret; |
1017 | } |
1018 | |
1019 | static const struct iio_info mcp2221_info = { |
1020 | .read_raw = &mcp2221_read_raw, |
1021 | .write_raw = &mcp2221_write_raw, |
1022 | }; |
1023 | |
1024 | static int mcp_iio_channels(struct mcp2221 *mcp) |
1025 | { |
1026 | int idx, cnt = 0; |
1027 | bool dac_created = false; |
1028 | |
1029 | /* GP0 doesn't have ADC/DAC alternative function */ |
1030 | for (idx = 1; idx < MCP_NGPIO; idx++) { |
1031 | struct iio_chan_spec *chan = &mcp->iio_channels[cnt]; |
1032 | |
1033 | switch (mcp->mode[idx]) { |
1034 | case 2: |
1035 | chan->address = idx - 1; |
1036 | chan->channel = cnt++; |
1037 | break; |
1038 | case 3: |
1039 | /* GP1 doesn't have DAC alternative function */ |
1040 | if (idx == 1 || dac_created) |
1041 | continue; |
1042 | /* DAC1 and DAC2 outputs are connected to the same DAC */ |
1043 | dac_created = true; |
1044 | chan->output = 1; |
1045 | cnt++; |
1046 | break; |
1047 | default: |
1048 | continue; |
1049 | }; |
1050 | |
1051 | chan->type = IIO_VOLTAGE; |
1052 | chan->indexed = 1; |
1053 | chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW); |
1054 | chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE); |
1055 | chan->scan_index = -1; |
1056 | } |
1057 | |
1058 | return cnt; |
1059 | } |
1060 | |
1061 | static void mcp_init_work(struct work_struct *work) |
1062 | { |
1063 | struct iio_dev *indio_dev; |
1064 | struct mcp2221 *mcp = container_of(work, struct mcp2221, init_work.work); |
1065 | struct mcp2221_iio *data; |
1066 | static int retries = 5; |
1067 | int ret, num_channels; |
1068 | |
1069 | hid_hw_power(hdev: mcp->hdev, PM_HINT_FULLON); |
1070 | mutex_lock(&mcp->lock); |
1071 | |
1072 | mcp->txbuf[0] = MCP2221_GET_SRAM_SETTINGS; |
1073 | ret = mcp_send_data_req_status(mcp, out_report: mcp->txbuf, len: 1); |
1074 | |
1075 | if (ret == -EAGAIN) |
1076 | goto reschedule_task; |
1077 | |
1078 | num_channels = mcp_iio_channels(mcp); |
1079 | if (!num_channels) |
1080 | goto unlock; |
1081 | |
1082 | mcp->txbuf[0] = MCP2221_READ_FLASH_DATA; |
1083 | mcp->txbuf[1] = 0; |
1084 | ret = mcp_send_data_req_status(mcp, out_report: mcp->txbuf, len: 2); |
1085 | |
1086 | if (ret == -EAGAIN) |
1087 | goto reschedule_task; |
1088 | |
1089 | indio_dev = devm_iio_device_alloc(parent: &mcp->hdev->dev, sizeof_priv: sizeof(*data)); |
1090 | if (!indio_dev) |
1091 | goto unlock; |
1092 | |
1093 | data = iio_priv(indio_dev); |
1094 | data->mcp = mcp; |
1095 | |
1096 | indio_dev->name = "mcp2221" ; |
1097 | indio_dev->modes = INDIO_DIRECT_MODE; |
1098 | indio_dev->info = &mcp2221_info; |
1099 | indio_dev->channels = mcp->iio_channels; |
1100 | indio_dev->num_channels = num_channels; |
1101 | |
1102 | devm_iio_device_register(&mcp->hdev->dev, indio_dev); |
1103 | |
1104 | unlock: |
1105 | mutex_unlock(lock: &mcp->lock); |
1106 | hid_hw_power(hdev: mcp->hdev, PM_HINT_NORMAL); |
1107 | |
1108 | return; |
1109 | |
1110 | reschedule_task: |
1111 | mutex_unlock(lock: &mcp->lock); |
1112 | hid_hw_power(hdev: mcp->hdev, PM_HINT_NORMAL); |
1113 | |
1114 | if (!retries--) |
1115 | return; |
1116 | |
1117 | /* Device is not ready to read SRAM or FLASH data, try again */ |
1118 | schedule_delayed_work(dwork: &mcp->init_work, delay: msecs_to_jiffies(m: 100)); |
1119 | } |
1120 | #endif |
1121 | |
1122 | static int mcp2221_probe(struct hid_device *hdev, |
1123 | const struct hid_device_id *id) |
1124 | { |
1125 | int ret; |
1126 | struct mcp2221 *mcp; |
1127 | |
1128 | mcp = devm_kzalloc(dev: &hdev->dev, size: sizeof(*mcp), GFP_KERNEL); |
1129 | if (!mcp) |
1130 | return -ENOMEM; |
1131 | |
1132 | ret = hid_parse(hdev); |
1133 | if (ret) { |
1134 | hid_err(hdev, "can't parse reports\n" ); |
1135 | return ret; |
1136 | } |
1137 | |
1138 | /* |
1139 | * This driver uses the .raw_event callback and therefore does not need any |
1140 | * HID_CONNECT_xxx flags. |
1141 | */ |
1142 | ret = hid_hw_start(hdev, connect_mask: 0); |
1143 | if (ret) { |
1144 | hid_err(hdev, "can't start hardware\n" ); |
1145 | return ret; |
1146 | } |
1147 | |
1148 | hid_info(hdev, "USB HID v%x.%02x Device [%s] on %s\n" , hdev->version >> 8, |
1149 | hdev->version & 0xff, hdev->name, hdev->phys); |
1150 | |
1151 | ret = hid_hw_open(hdev); |
1152 | if (ret) { |
1153 | hid_err(hdev, "can't open device\n" ); |
1154 | hid_hw_stop(hdev); |
1155 | return ret; |
1156 | } |
1157 | |
1158 | mutex_init(&mcp->lock); |
1159 | init_completion(x: &mcp->wait_in_report); |
1160 | hid_set_drvdata(hdev, data: mcp); |
1161 | mcp->hdev = hdev; |
1162 | |
1163 | ret = devm_add_action_or_reset(&hdev->dev, mcp2221_hid_unregister, hdev); |
1164 | if (ret) |
1165 | return ret; |
1166 | |
1167 | hid_device_io_start(hid: hdev); |
1168 | |
1169 | /* Set I2C bus clock diviser */ |
1170 | if (i2c_clk_freq > 400) |
1171 | i2c_clk_freq = 400; |
1172 | if (i2c_clk_freq < 50) |
1173 | i2c_clk_freq = 50; |
1174 | mcp->cur_i2c_clk_div = (12000000 / (i2c_clk_freq * 1000)) - 3; |
1175 | ret = mcp_set_i2c_speed(mcp); |
1176 | if (ret) { |
1177 | hid_err(hdev, "can't set i2c speed: %d\n" , ret); |
1178 | return ret; |
1179 | } |
1180 | |
1181 | mcp->adapter.owner = THIS_MODULE; |
1182 | mcp->adapter.class = I2C_CLASS_HWMON; |
1183 | mcp->adapter.algo = &mcp_i2c_algo; |
1184 | mcp->adapter.retries = 1; |
1185 | mcp->adapter.dev.parent = &hdev->dev; |
1186 | ACPI_COMPANION_SET(&mcp->adapter.dev, ACPI_COMPANION(hdev->dev.parent)); |
1187 | snprintf(buf: mcp->adapter.name, size: sizeof(mcp->adapter.name), |
1188 | fmt: "MCP2221 usb-i2c bridge" ); |
1189 | |
1190 | i2c_set_adapdata(adap: &mcp->adapter, data: mcp); |
1191 | ret = devm_i2c_add_adapter(dev: &hdev->dev, adapter: &mcp->adapter); |
1192 | if (ret) { |
1193 | hid_err(hdev, "can't add usb-i2c adapter: %d\n" , ret); |
1194 | return ret; |
1195 | } |
1196 | |
1197 | #if IS_REACHABLE(CONFIG_GPIOLIB) |
1198 | /* Setup GPIO chip */ |
1199 | mcp->gc = devm_kzalloc(dev: &hdev->dev, size: sizeof(*mcp->gc), GFP_KERNEL); |
1200 | if (!mcp->gc) |
1201 | return -ENOMEM; |
1202 | |
1203 | mcp->gc->label = "mcp2221_gpio" ; |
1204 | mcp->gc->direction_input = mcp_gpio_direction_input; |
1205 | mcp->gc->direction_output = mcp_gpio_direction_output; |
1206 | mcp->gc->get_direction = mcp_gpio_get_direction; |
1207 | mcp->gc->set = mcp_gpio_set; |
1208 | mcp->gc->get = mcp_gpio_get; |
1209 | mcp->gc->ngpio = MCP_NGPIO; |
1210 | mcp->gc->base = -1; |
1211 | mcp->gc->can_sleep = 1; |
1212 | mcp->gc->parent = &hdev->dev; |
1213 | |
1214 | ret = devm_gpiochip_add_data(&hdev->dev, mcp->gc, mcp); |
1215 | if (ret) |
1216 | return ret; |
1217 | #endif |
1218 | |
1219 | #if IS_REACHABLE(CONFIG_IIO) |
1220 | INIT_DELAYED_WORK(&mcp->init_work, mcp_init_work); |
1221 | schedule_delayed_work(dwork: &mcp->init_work, delay: msecs_to_jiffies(m: 100)); |
1222 | #endif |
1223 | |
1224 | return 0; |
1225 | } |
1226 | |
1227 | static const struct hid_device_id mcp2221_devices[] = { |
1228 | { HID_USB_DEVICE(USB_VENDOR_ID_MICROCHIP, USB_DEVICE_ID_MCP2221) }, |
1229 | { } |
1230 | }; |
1231 | MODULE_DEVICE_TABLE(hid, mcp2221_devices); |
1232 | |
1233 | static struct hid_driver mcp2221_driver = { |
1234 | .name = "mcp2221" , |
1235 | .id_table = mcp2221_devices, |
1236 | .probe = mcp2221_probe, |
1237 | .remove = mcp2221_remove, |
1238 | .raw_event = mcp2221_raw_event, |
1239 | }; |
1240 | |
1241 | /* Register with HID core */ |
1242 | module_hid_driver(mcp2221_driver); |
1243 | |
1244 | MODULE_AUTHOR("Rishi Gupta <gupt21@gmail.com>" ); |
1245 | MODULE_DESCRIPTION("MCP2221 Microchip HID USB to I2C master bridge" ); |
1246 | MODULE_LICENSE("GPL v2" ); |
1247 | |