1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Microchip AT42QT1050 QTouch Sensor Controller |
4 | * |
5 | * Copyright (C) 2019 Pengutronix, Marco Felsch <kernel@pengutronix.de> |
6 | * |
7 | * Base on AT42QT1070 driver by: |
8 | * Bo Shen <voice.shen@atmel.com> |
9 | * Copyright (C) 2011 Atmel |
10 | */ |
11 | |
12 | #include <linux/delay.h> |
13 | #include <linux/i2c.h> |
14 | #include <linux/input.h> |
15 | #include <linux/interrupt.h> |
16 | #include <linux/kernel.h> |
17 | #include <linux/log2.h> |
18 | #include <linux/module.h> |
19 | #include <linux/of.h> |
20 | #include <linux/regmap.h> |
21 | |
22 | /* Chip ID */ |
23 | #define QT1050_CHIP_ID 0x00 |
24 | #define QT1050_CHIP_ID_VER 0x46 |
25 | |
26 | /* Firmware version */ |
27 | #define QT1050_FW_VERSION 0x01 |
28 | |
29 | /* Detection status */ |
30 | #define QT1050_DET_STATUS 0x02 |
31 | |
32 | /* Key status */ |
33 | #define QT1050_KEY_STATUS 0x03 |
34 | |
35 | /* Key Signals */ |
36 | #define QT1050_KEY_SIGNAL_0_MSB 0x06 |
37 | #define QT1050_KEY_SIGNAL_0_LSB 0x07 |
38 | #define QT1050_KEY_SIGNAL_1_MSB 0x08 |
39 | #define QT1050_KEY_SIGNAL_1_LSB 0x09 |
40 | #define QT1050_KEY_SIGNAL_2_MSB 0x0c |
41 | #define QT1050_KEY_SIGNAL_2_LSB 0x0d |
42 | #define QT1050_KEY_SIGNAL_3_MSB 0x0e |
43 | #define QT1050_KEY_SIGNAL_3_LSB 0x0f |
44 | #define QT1050_KEY_SIGNAL_4_MSB 0x10 |
45 | #define QT1050_KEY_SIGNAL_4_LSB 0x11 |
46 | |
47 | /* Reference data */ |
48 | #define QT1050_REF_DATA_0_MSB 0x14 |
49 | #define QT1050_REF_DATA_0_LSB 0x15 |
50 | #define QT1050_REF_DATA_1_MSB 0x16 |
51 | #define QT1050_REF_DATA_1_LSB 0x17 |
52 | #define QT1050_REF_DATA_2_MSB 0x1a |
53 | #define QT1050_REF_DATA_2_LSB 0x1b |
54 | #define QT1050_REF_DATA_3_MSB 0x1c |
55 | #define QT1050_REF_DATA_3_LSB 0x1d |
56 | #define QT1050_REF_DATA_4_MSB 0x1e |
57 | #define QT1050_REF_DATA_4_LSB 0x1f |
58 | |
59 | /* Negative threshold level */ |
60 | #define QT1050_NTHR_0 0x21 |
61 | #define QT1050_NTHR_1 0x22 |
62 | #define QT1050_NTHR_2 0x24 |
63 | #define QT1050_NTHR_3 0x25 |
64 | #define QT1050_NTHR_4 0x26 |
65 | |
66 | /* Pulse / Scale */ |
67 | #define QT1050_PULSE_SCALE_0 0x28 |
68 | #define QT1050_PULSE_SCALE_1 0x29 |
69 | #define QT1050_PULSE_SCALE_2 0x2b |
70 | #define QT1050_PULSE_SCALE_3 0x2c |
71 | #define QT1050_PULSE_SCALE_4 0x2d |
72 | |
73 | /* Detection integrator counter / AKS */ |
74 | #define QT1050_DI_AKS_0 0x2f |
75 | #define QT1050_DI_AKS_1 0x30 |
76 | #define QT1050_DI_AKS_2 0x32 |
77 | #define QT1050_DI_AKS_3 0x33 |
78 | #define QT1050_DI_AKS_4 0x34 |
79 | |
80 | /* Charge Share Delay */ |
81 | #define QT1050_CSD_0 0x36 |
82 | #define QT1050_CSD_1 0x37 |
83 | #define QT1050_CSD_2 0x39 |
84 | #define QT1050_CSD_3 0x3a |
85 | #define QT1050_CSD_4 0x3b |
86 | |
87 | /* Low Power Mode */ |
88 | #define QT1050_LPMODE 0x3d |
89 | |
90 | /* Calibration and Reset */ |
91 | #define QT1050_RES_CAL 0x3f |
92 | #define QT1050_RES_CAL_RESET BIT(7) |
93 | #define QT1050_RES_CAL_CALIBRATE BIT(1) |
94 | |
95 | #define QT1050_MAX_KEYS 5 |
96 | #define QT1050_RESET_TIME 255 |
97 | |
98 | struct qt1050_key_regs { |
99 | unsigned int nthr; |
100 | unsigned int pulse_scale; |
101 | unsigned int di_aks; |
102 | unsigned int csd; |
103 | }; |
104 | |
105 | struct qt1050_key { |
106 | u32 num; |
107 | u32 charge_delay; |
108 | u32 thr_cnt; |
109 | u32 samples; |
110 | u32 scale; |
111 | u32 keycode; |
112 | }; |
113 | |
114 | struct qt1050_priv { |
115 | struct i2c_client *client; |
116 | struct input_dev *input; |
117 | struct regmap *regmap; |
118 | struct qt1050_key keys[QT1050_MAX_KEYS]; |
119 | unsigned short keycodes[QT1050_MAX_KEYS]; |
120 | u8 reg_keys; |
121 | u8 last_keys; |
122 | }; |
123 | |
124 | static const struct qt1050_key_regs qt1050_key_regs_data[] = { |
125 | { |
126 | .nthr = QT1050_NTHR_0, |
127 | .pulse_scale = QT1050_PULSE_SCALE_0, |
128 | .di_aks = QT1050_DI_AKS_0, |
129 | .csd = QT1050_CSD_0, |
130 | }, { |
131 | .nthr = QT1050_NTHR_1, |
132 | .pulse_scale = QT1050_PULSE_SCALE_1, |
133 | .di_aks = QT1050_DI_AKS_1, |
134 | .csd = QT1050_CSD_1, |
135 | }, { |
136 | .nthr = QT1050_NTHR_2, |
137 | .pulse_scale = QT1050_PULSE_SCALE_2, |
138 | .di_aks = QT1050_DI_AKS_2, |
139 | .csd = QT1050_CSD_2, |
140 | }, { |
141 | .nthr = QT1050_NTHR_3, |
142 | .pulse_scale = QT1050_PULSE_SCALE_3, |
143 | .di_aks = QT1050_DI_AKS_3, |
144 | .csd = QT1050_CSD_3, |
145 | }, { |
146 | .nthr = QT1050_NTHR_4, |
147 | .pulse_scale = QT1050_PULSE_SCALE_4, |
148 | .di_aks = QT1050_DI_AKS_4, |
149 | .csd = QT1050_CSD_4, |
150 | } |
151 | }; |
152 | |
153 | static bool qt1050_volatile_reg(struct device *dev, unsigned int reg) |
154 | { |
155 | switch (reg) { |
156 | case QT1050_DET_STATUS: |
157 | case QT1050_KEY_STATUS: |
158 | case QT1050_KEY_SIGNAL_0_MSB: |
159 | case QT1050_KEY_SIGNAL_0_LSB: |
160 | case QT1050_KEY_SIGNAL_1_MSB: |
161 | case QT1050_KEY_SIGNAL_1_LSB: |
162 | case QT1050_KEY_SIGNAL_2_MSB: |
163 | case QT1050_KEY_SIGNAL_2_LSB: |
164 | case QT1050_KEY_SIGNAL_3_MSB: |
165 | case QT1050_KEY_SIGNAL_3_LSB: |
166 | case QT1050_KEY_SIGNAL_4_MSB: |
167 | case QT1050_KEY_SIGNAL_4_LSB: |
168 | return true; |
169 | default: |
170 | return false; |
171 | } |
172 | } |
173 | |
174 | static const struct regmap_range qt1050_readable_ranges[] = { |
175 | regmap_reg_range(QT1050_CHIP_ID, QT1050_KEY_STATUS), |
176 | regmap_reg_range(QT1050_KEY_SIGNAL_0_MSB, QT1050_KEY_SIGNAL_1_LSB), |
177 | regmap_reg_range(QT1050_KEY_SIGNAL_2_MSB, QT1050_KEY_SIGNAL_4_LSB), |
178 | regmap_reg_range(QT1050_REF_DATA_0_MSB, QT1050_REF_DATA_1_LSB), |
179 | regmap_reg_range(QT1050_REF_DATA_2_MSB, QT1050_REF_DATA_4_LSB), |
180 | regmap_reg_range(QT1050_NTHR_0, QT1050_NTHR_1), |
181 | regmap_reg_range(QT1050_NTHR_2, QT1050_NTHR_4), |
182 | regmap_reg_range(QT1050_PULSE_SCALE_0, QT1050_PULSE_SCALE_1), |
183 | regmap_reg_range(QT1050_PULSE_SCALE_2, QT1050_PULSE_SCALE_4), |
184 | regmap_reg_range(QT1050_DI_AKS_0, QT1050_DI_AKS_1), |
185 | regmap_reg_range(QT1050_DI_AKS_2, QT1050_DI_AKS_4), |
186 | regmap_reg_range(QT1050_CSD_0, QT1050_CSD_1), |
187 | regmap_reg_range(QT1050_CSD_2, QT1050_RES_CAL), |
188 | }; |
189 | |
190 | static const struct regmap_access_table qt1050_readable_table = { |
191 | .yes_ranges = qt1050_readable_ranges, |
192 | .n_yes_ranges = ARRAY_SIZE(qt1050_readable_ranges), |
193 | }; |
194 | |
195 | static const struct regmap_range qt1050_writeable_ranges[] = { |
196 | regmap_reg_range(QT1050_NTHR_0, QT1050_NTHR_1), |
197 | regmap_reg_range(QT1050_NTHR_2, QT1050_NTHR_4), |
198 | regmap_reg_range(QT1050_PULSE_SCALE_0, QT1050_PULSE_SCALE_1), |
199 | regmap_reg_range(QT1050_PULSE_SCALE_2, QT1050_PULSE_SCALE_4), |
200 | regmap_reg_range(QT1050_DI_AKS_0, QT1050_DI_AKS_1), |
201 | regmap_reg_range(QT1050_DI_AKS_2, QT1050_DI_AKS_4), |
202 | regmap_reg_range(QT1050_CSD_0, QT1050_CSD_1), |
203 | regmap_reg_range(QT1050_CSD_2, QT1050_RES_CAL), |
204 | }; |
205 | |
206 | static const struct regmap_access_table qt1050_writeable_table = { |
207 | .yes_ranges = qt1050_writeable_ranges, |
208 | .n_yes_ranges = ARRAY_SIZE(qt1050_writeable_ranges), |
209 | }; |
210 | |
211 | static struct regmap_config qt1050_regmap_config = { |
212 | .reg_bits = 8, |
213 | .val_bits = 8, |
214 | .max_register = QT1050_RES_CAL, |
215 | |
216 | .cache_type = REGCACHE_MAPLE, |
217 | |
218 | .wr_table = &qt1050_writeable_table, |
219 | .rd_table = &qt1050_readable_table, |
220 | .volatile_reg = qt1050_volatile_reg, |
221 | }; |
222 | |
223 | static bool qt1050_identify(struct qt1050_priv *ts) |
224 | { |
225 | unsigned int val; |
226 | int err; |
227 | |
228 | /* Read Chip ID */ |
229 | regmap_read(map: ts->regmap, QT1050_CHIP_ID, val: &val); |
230 | if (val != QT1050_CHIP_ID_VER) { |
231 | dev_err(&ts->client->dev, "ID %d not supported\n" , val); |
232 | return false; |
233 | } |
234 | |
235 | /* Read firmware version */ |
236 | err = regmap_read(map: ts->regmap, QT1050_FW_VERSION, val: &val); |
237 | if (err) { |
238 | dev_err(&ts->client->dev, "could not read the firmware version\n" ); |
239 | return false; |
240 | } |
241 | |
242 | dev_info(&ts->client->dev, "AT42QT1050 firmware version %1d.%1d\n" , |
243 | val >> 4, val & 0xf); |
244 | |
245 | return true; |
246 | } |
247 | |
248 | static irqreturn_t qt1050_irq_threaded(int irq, void *dev_id) |
249 | { |
250 | struct qt1050_priv *ts = dev_id; |
251 | struct input_dev *input = ts->input; |
252 | unsigned long new_keys, changed; |
253 | unsigned int val; |
254 | int i, err; |
255 | |
256 | /* Read the detected status register, thus clearing interrupt */ |
257 | err = regmap_read(map: ts->regmap, QT1050_DET_STATUS, val: &val); |
258 | if (err) { |
259 | dev_err(&ts->client->dev, "Fail to read detection status: %d\n" , |
260 | err); |
261 | return IRQ_NONE; |
262 | } |
263 | |
264 | /* Read which key changed, keys are not continuous */ |
265 | err = regmap_read(map: ts->regmap, QT1050_KEY_STATUS, val: &val); |
266 | if (err) { |
267 | dev_err(&ts->client->dev, |
268 | "Fail to determine the key status: %d\n" , err); |
269 | return IRQ_NONE; |
270 | } |
271 | new_keys = (val & 0x70) >> 2 | (val & 0x6) >> 1; |
272 | changed = ts->last_keys ^ new_keys; |
273 | /* Report registered keys only */ |
274 | changed &= ts->reg_keys; |
275 | |
276 | for_each_set_bit(i, &changed, QT1050_MAX_KEYS) |
277 | input_report_key(dev: input, code: ts->keys[i].keycode, |
278 | test_bit(i, &new_keys)); |
279 | |
280 | ts->last_keys = new_keys; |
281 | input_sync(dev: input); |
282 | |
283 | return IRQ_HANDLED; |
284 | } |
285 | |
286 | static const struct qt1050_key_regs *qt1050_get_key_regs(int key_num) |
287 | { |
288 | return &qt1050_key_regs_data[key_num]; |
289 | } |
290 | |
291 | static int qt1050_set_key(struct regmap *map, int number, int on) |
292 | { |
293 | const struct qt1050_key_regs *key_regs; |
294 | |
295 | key_regs = qt1050_get_key_regs(key_num: number); |
296 | |
297 | return regmap_update_bits(map, reg: key_regs->di_aks, mask: 0xfc, |
298 | val: on ? BIT(4) : 0x00); |
299 | } |
300 | |
301 | static int qt1050_apply_fw_data(struct qt1050_priv *ts) |
302 | { |
303 | struct regmap *map = ts->regmap; |
304 | struct qt1050_key *button = &ts->keys[0]; |
305 | const struct qt1050_key_regs *key_regs; |
306 | int i, err; |
307 | |
308 | /* Disable all keys and enable only the specified ones */ |
309 | for (i = 0; i < QT1050_MAX_KEYS; i++) { |
310 | err = qt1050_set_key(map, number: i, on: 0); |
311 | if (err) |
312 | return err; |
313 | } |
314 | |
315 | for (i = 0; i < QT1050_MAX_KEYS; i++, button++) { |
316 | /* Keep KEY_RESERVED keys off */ |
317 | if (button->keycode == KEY_RESERVED) |
318 | continue; |
319 | |
320 | err = qt1050_set_key(map, number: button->num, on: 1); |
321 | if (err) |
322 | return err; |
323 | |
324 | key_regs = qt1050_get_key_regs(key_num: button->num); |
325 | |
326 | err = regmap_write(map, reg: key_regs->pulse_scale, |
327 | val: (button->samples << 4) | (button->scale)); |
328 | if (err) |
329 | return err; |
330 | err = regmap_write(map, reg: key_regs->csd, val: button->charge_delay); |
331 | if (err) |
332 | return err; |
333 | err = regmap_write(map, reg: key_regs->nthr, val: button->thr_cnt); |
334 | if (err) |
335 | return err; |
336 | } |
337 | |
338 | return 0; |
339 | } |
340 | |
341 | static int qt1050_parse_fw(struct qt1050_priv *ts) |
342 | { |
343 | struct device *dev = &ts->client->dev; |
344 | struct fwnode_handle *child; |
345 | int nbuttons; |
346 | |
347 | nbuttons = device_get_child_node_count(dev); |
348 | if (nbuttons == 0 || nbuttons > QT1050_MAX_KEYS) |
349 | return -ENODEV; |
350 | |
351 | device_for_each_child_node(dev, child) { |
352 | struct qt1050_key button; |
353 | |
354 | /* Required properties */ |
355 | if (fwnode_property_read_u32(fwnode: child, propname: "linux,code" , |
356 | val: &button.keycode)) { |
357 | dev_err(dev, "Button without keycode\n" ); |
358 | goto err; |
359 | } |
360 | if (button.keycode >= KEY_MAX) { |
361 | dev_err(dev, "Invalid keycode 0x%x\n" , |
362 | button.keycode); |
363 | goto err; |
364 | } |
365 | |
366 | if (fwnode_property_read_u32(fwnode: child, propname: "reg" , |
367 | val: &button.num)) { |
368 | dev_err(dev, "Button without pad number\n" ); |
369 | goto err; |
370 | } |
371 | if (button.num < 0 || button.num > QT1050_MAX_KEYS - 1) |
372 | goto err; |
373 | |
374 | ts->reg_keys |= BIT(button.num); |
375 | |
376 | /* Optional properties */ |
377 | if (fwnode_property_read_u32(fwnode: child, |
378 | propname: "microchip,pre-charge-time-ns" , |
379 | val: &button.charge_delay)) { |
380 | button.charge_delay = 0; |
381 | } else { |
382 | if (button.charge_delay % 2500 == 0) |
383 | button.charge_delay = |
384 | button.charge_delay / 2500; |
385 | else |
386 | button.charge_delay = 0; |
387 | } |
388 | |
389 | if (fwnode_property_read_u32(fwnode: child, propname: "microchip,average-samples" , |
390 | val: &button.samples)) { |
391 | button.samples = 0; |
392 | } else { |
393 | if (is_power_of_2(n: button.samples)) |
394 | button.samples = ilog2(button.samples); |
395 | else |
396 | button.samples = 0; |
397 | } |
398 | |
399 | if (fwnode_property_read_u32(fwnode: child, propname: "microchip,average-scaling" , |
400 | val: &button.scale)) { |
401 | button.scale = 0; |
402 | } else { |
403 | if (is_power_of_2(n: button.scale)) |
404 | button.scale = ilog2(button.scale); |
405 | else |
406 | button.scale = 0; |
407 | |
408 | } |
409 | |
410 | if (fwnode_property_read_u32(fwnode: child, propname: "microchip,threshold" , |
411 | val: &button.thr_cnt)) { |
412 | button.thr_cnt = 20; |
413 | } else { |
414 | if (button.thr_cnt > 255) |
415 | button.thr_cnt = 20; |
416 | } |
417 | |
418 | ts->keys[button.num] = button; |
419 | } |
420 | |
421 | return 0; |
422 | |
423 | err: |
424 | fwnode_handle_put(fwnode: child); |
425 | return -EINVAL; |
426 | } |
427 | |
428 | static int qt1050_probe(struct i2c_client *client) |
429 | { |
430 | struct qt1050_priv *ts; |
431 | struct input_dev *input; |
432 | struct device *dev = &client->dev; |
433 | struct regmap *map; |
434 | unsigned int status, i; |
435 | int err; |
436 | |
437 | /* Check basic functionality */ |
438 | err = i2c_check_functionality(adap: client->adapter, I2C_FUNC_SMBUS_BYTE); |
439 | if (!err) { |
440 | dev_err(&client->dev, "%s adapter not supported\n" , |
441 | dev_driver_string(&client->adapter->dev)); |
442 | return -ENODEV; |
443 | } |
444 | |
445 | if (!client->irq) { |
446 | dev_err(dev, "assign a irq line to this device\n" ); |
447 | return -EINVAL; |
448 | } |
449 | |
450 | ts = devm_kzalloc(dev, size: sizeof(*ts), GFP_KERNEL); |
451 | if (!ts) |
452 | return -ENOMEM; |
453 | |
454 | input = devm_input_allocate_device(dev); |
455 | if (!input) |
456 | return -ENOMEM; |
457 | |
458 | map = devm_regmap_init_i2c(client, &qt1050_regmap_config); |
459 | if (IS_ERR(ptr: map)) |
460 | return PTR_ERR(ptr: map); |
461 | |
462 | ts->client = client; |
463 | ts->input = input; |
464 | ts->regmap = map; |
465 | |
466 | i2c_set_clientdata(client, data: ts); |
467 | |
468 | /* Identify the qt1050 chip */ |
469 | if (!qt1050_identify(ts)) |
470 | return -ENODEV; |
471 | |
472 | /* Get pdata */ |
473 | err = qt1050_parse_fw(ts); |
474 | if (err) { |
475 | dev_err(dev, "Failed to parse firmware: %d\n" , err); |
476 | return err; |
477 | } |
478 | |
479 | input->name = "AT42QT1050 QTouch Sensor" ; |
480 | input->dev.parent = &client->dev; |
481 | input->id.bustype = BUS_I2C; |
482 | |
483 | /* Add the keycode */ |
484 | input->keycode = ts->keycodes; |
485 | input->keycodesize = sizeof(ts->keycodes[0]); |
486 | input->keycodemax = QT1050_MAX_KEYS; |
487 | |
488 | __set_bit(EV_KEY, input->evbit); |
489 | for (i = 0; i < QT1050_MAX_KEYS; i++) { |
490 | ts->keycodes[i] = ts->keys[i].keycode; |
491 | __set_bit(ts->keycodes[i], input->keybit); |
492 | } |
493 | |
494 | /* Trigger re-calibration */ |
495 | err = regmap_update_bits(map: ts->regmap, QT1050_RES_CAL, mask: 0x7f, |
496 | QT1050_RES_CAL_CALIBRATE); |
497 | if (err) { |
498 | dev_err(dev, "Trigger calibration failed: %d\n" , err); |
499 | return err; |
500 | } |
501 | err = regmap_read_poll_timeout(ts->regmap, QT1050_DET_STATUS, status, |
502 | status >> 7 == 1, 10000, 200000); |
503 | if (err) { |
504 | dev_err(dev, "Calibration failed: %d\n" , err); |
505 | return err; |
506 | } |
507 | |
508 | /* Soft reset to set defaults */ |
509 | err = regmap_update_bits(map: ts->regmap, QT1050_RES_CAL, |
510 | QT1050_RES_CAL_RESET, QT1050_RES_CAL_RESET); |
511 | if (err) { |
512 | dev_err(dev, "Trigger soft reset failed: %d\n" , err); |
513 | return err; |
514 | } |
515 | msleep(QT1050_RESET_TIME); |
516 | |
517 | /* Set pdata */ |
518 | err = qt1050_apply_fw_data(ts); |
519 | if (err) { |
520 | dev_err(dev, "Failed to set firmware data: %d\n" , err); |
521 | return err; |
522 | } |
523 | |
524 | err = devm_request_threaded_irq(dev, irq: client->irq, NULL, |
525 | thread_fn: qt1050_irq_threaded, IRQF_ONESHOT, |
526 | devname: "qt1050" , dev_id: ts); |
527 | if (err) { |
528 | dev_err(&client->dev, "Failed to request irq: %d\n" , err); |
529 | return err; |
530 | } |
531 | |
532 | /* Clear #CHANGE line */ |
533 | err = regmap_read(map: ts->regmap, QT1050_DET_STATUS, val: &status); |
534 | if (err) { |
535 | dev_err(dev, "Failed to clear #CHANGE line level: %d\n" , err); |
536 | return err; |
537 | } |
538 | |
539 | /* Register the input device */ |
540 | err = input_register_device(ts->input); |
541 | if (err) { |
542 | dev_err(&client->dev, "Failed to register input device: %d\n" , |
543 | err); |
544 | return err; |
545 | } |
546 | |
547 | return 0; |
548 | } |
549 | |
550 | static int qt1050_suspend(struct device *dev) |
551 | { |
552 | struct i2c_client *client = to_i2c_client(dev); |
553 | struct qt1050_priv *ts = i2c_get_clientdata(client); |
554 | |
555 | disable_irq(irq: client->irq); |
556 | |
557 | /* |
558 | * Set measurement interval to 1s (125 x 8ms) if wakeup is allowed |
559 | * else turn off. The 1s interval seems to be a good compromise between |
560 | * low power and response time. |
561 | */ |
562 | return regmap_write(map: ts->regmap, QT1050_LPMODE, |
563 | val: device_may_wakeup(dev) ? 125 : 0); |
564 | } |
565 | |
566 | static int qt1050_resume(struct device *dev) |
567 | { |
568 | struct i2c_client *client = to_i2c_client(dev); |
569 | struct qt1050_priv *ts = i2c_get_clientdata(client); |
570 | |
571 | enable_irq(irq: client->irq); |
572 | |
573 | /* Set measurement interval back to 16ms (2 x 8ms) */ |
574 | return regmap_write(map: ts->regmap, QT1050_LPMODE, val: 2); |
575 | } |
576 | |
577 | static DEFINE_SIMPLE_DEV_PM_OPS(qt1050_pm_ops, qt1050_suspend, qt1050_resume); |
578 | |
579 | static const struct of_device_id __maybe_unused qt1050_of_match[] = { |
580 | { .compatible = "microchip,qt1050" , }, |
581 | { }, |
582 | }; |
583 | MODULE_DEVICE_TABLE(of, qt1050_of_match); |
584 | |
585 | static struct i2c_driver qt1050_driver = { |
586 | .driver = { |
587 | .name = "qt1050" , |
588 | .of_match_table = of_match_ptr(qt1050_of_match), |
589 | .pm = pm_sleep_ptr(&qt1050_pm_ops), |
590 | }, |
591 | .probe = qt1050_probe, |
592 | }; |
593 | |
594 | module_i2c_driver(qt1050_driver); |
595 | |
596 | MODULE_AUTHOR("Marco Felsch <kernel@pengutronix.de" ); |
597 | MODULE_DESCRIPTION("Driver for AT42QT1050 QTouch sensor" ); |
598 | MODULE_LICENSE("GPL v2" ); |
599 | |