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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
23#define QT1050_CHIP_ID 0x00
24#define QT1050_CHIP_ID_VER 0x46
25
26
27#define QT1050_FW_VERSION 0x01
28
29
30#define QT1050_DET_STATUS 0x02
31
32
33#define QT1050_KEY_STATUS 0x03
34
35
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
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
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
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
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
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
88#define QT1050_LPMODE 0x3d
89
90
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
98struct qt1050_key_regs {
99 unsigned int nthr;
100 unsigned int pulse_scale;
101 unsigned int di_aks;
102 unsigned int csd;
103};
104
105struct qt1050_key {
106 u32 num;
107 u32 charge_delay;
108 u32 thr_cnt;
109 u32 samples;
110 u32 scale;
111 u32 keycode;
112};
113
114struct 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
124static 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
153static 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
174static 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
190static 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
195static 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
206static 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
211static 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_RBTREE,
217
218 .wr_table = &qt1050_writeable_table,
219 .rd_table = &qt1050_readable_table,
220 .volatile_reg = qt1050_volatile_reg,
221};
222
223static bool qt1050_identify(struct qt1050_priv *ts)
224{
225 unsigned int val;
226 int err;
227
228
229 regmap_read(ts->regmap, QT1050_CHIP_ID, &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
236 err = regmap_read(ts->regmap, QT1050_FW_VERSION, &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
248static 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
257 err = regmap_read(ts->regmap, QT1050_DET_STATUS, &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
265 err = regmap_read(ts->regmap, QT1050_KEY_STATUS, &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
274 changed &= ts->reg_keys;
275
276 for_each_set_bit(i, &changed, QT1050_MAX_KEYS)
277 input_report_key(input, ts->keys[i].keycode,
278 test_bit(i, &new_keys));
279
280 ts->last_keys = new_keys;
281 input_sync(input);
282
283 return IRQ_HANDLED;
284}
285
286static const struct qt1050_key_regs *qt1050_get_key_regs(int key_num)
287{
288 return &qt1050_key_regs_data[key_num];
289}
290
291static 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(number);
296
297 return regmap_update_bits(map, key_regs->di_aks, 0xfc,
298 on ? BIT(4) : 0x00);
299}
300
301static 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
309 for (i = 0; i < QT1050_MAX_KEYS; i++) {
310 err = qt1050_set_key(map, i, 0);
311 if (err)
312 return err;
313 }
314
315 for (i = 0; i < QT1050_MAX_KEYS; i++, button++) {
316
317 if (button->keycode == KEY_RESERVED)
318 continue;
319
320 err = qt1050_set_key(map, button->num, 1);
321 if (err)
322 return err;
323
324 key_regs = qt1050_get_key_regs(button->num);
325
326 err = regmap_write(map, key_regs->pulse_scale,
327 (button->samples << 4) | (button->scale));
328 if (err)
329 return err;
330 err = regmap_write(map, key_regs->csd, button->charge_delay);
331 if (err)
332 return err;
333 err = regmap_write(map, key_regs->nthr, button->thr_cnt);
334 if (err)
335 return err;
336 }
337
338 return 0;
339}
340
341static 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
355 if (fwnode_property_read_u32(child, "linux,code",
356 &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(child, "reg",
367 &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
377 if (fwnode_property_read_u32(child,
378 "microchip,pre-charge-time-ns",
379 &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(child, "microchip,average-samples",
390 &button.samples)) {
391 button.samples = 0;
392 } else {
393 if (is_power_of_2(button.samples))
394 button.samples = ilog2(button.samples);
395 else
396 button.samples = 0;
397 }
398
399 if (fwnode_property_read_u32(child, "microchip,average-scaling",
400 &button.scale)) {
401 button.scale = 0;
402 } else {
403 if (is_power_of_2(button.scale))
404 button.scale = ilog2(button.scale);
405 else
406 button.scale = 0;
407
408 }
409
410 if (fwnode_property_read_u32(child, "microchip,threshold",
411 &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
423err:
424 fwnode_handle_put(child);
425 return -EINVAL;
426}
427
428static 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
438 err = i2c_check_functionality(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, 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(map))
460 return PTR_ERR(map);
461
462 ts->client = client;
463 ts->input = input;
464 ts->regmap = map;
465
466 i2c_set_clientdata(client, ts);
467
468
469 if (!qt1050_identify(ts))
470 return -ENODEV;
471
472
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
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
495 err = regmap_update_bits(ts->regmap, QT1050_RES_CAL, 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
509 err = regmap_update_bits(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
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, client->irq, NULL,
525 qt1050_irq_threaded, IRQF_ONESHOT,
526 "qt1050", ts);
527 if (err) {
528 dev_err(&client->dev, "Failed to request irq: %d\n", err);
529 return err;
530 }
531
532
533 err = regmap_read(ts->regmap, QT1050_DET_STATUS, &status);
534 if (err) {
535 dev_err(dev, "Failed to clear #CHANGE line level: %d\n", err);
536 return err;
537 }
538
539
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
550static int __maybe_unused 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(client->irq);
556
557
558
559
560
561
562 return regmap_write(ts->regmap, QT1050_LPMODE,
563 device_may_wakeup(dev) ? 125 : 0);
564}
565
566static int __maybe_unused 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(client->irq);
572
573
574 return regmap_write(ts->regmap, QT1050_LPMODE, 2);
575}
576
577static SIMPLE_DEV_PM_OPS(qt1050_pm_ops, qt1050_suspend, qt1050_resume);
578
579static const struct of_device_id __maybe_unused qt1050_of_match[] = {
580 { .compatible = "microchip,qt1050", },
581 { },
582};
583MODULE_DEVICE_TABLE(of, qt1050_of_match);
584
585static struct i2c_driver qt1050_driver = {
586 .driver = {
587 .name = "qt1050",
588 .of_match_table = of_match_ptr(qt1050_of_match),
589 .pm = &qt1050_pm_ops,
590 },
591 .probe_new = qt1050_probe,
592};
593
594module_i2c_driver(qt1050_driver);
595
596MODULE_AUTHOR("Marco Felsch <kernel@pengutronix.de");
597MODULE_DESCRIPTION("Driver for AT42QT1050 QTouch sensor");
598MODULE_LICENSE("GPL v2");
599
