1cbebf5adSMarco Felsch // SPDX-License-Identifier: GPL-2.0
2cbebf5adSMarco Felsch /*
3cbebf5adSMarco Felsch * Microchip AT42QT1050 QTouch Sensor Controller
4cbebf5adSMarco Felsch *
5cbebf5adSMarco Felsch * Copyright (C) 2019 Pengutronix, Marco Felsch <kernel@pengutronix.de>
6cbebf5adSMarco Felsch *
7cbebf5adSMarco Felsch * Base on AT42QT1070 driver by:
8cbebf5adSMarco Felsch * Bo Shen <voice.shen@atmel.com>
9cbebf5adSMarco Felsch * Copyright (C) 2011 Atmel
10cbebf5adSMarco Felsch */
11cbebf5adSMarco Felsch
12cbebf5adSMarco Felsch #include <linux/delay.h>
13cbebf5adSMarco Felsch #include <linux/i2c.h>
14cbebf5adSMarco Felsch #include <linux/input.h>
15cbebf5adSMarco Felsch #include <linux/interrupt.h>
16cbebf5adSMarco Felsch #include <linux/kernel.h>
17cbebf5adSMarco Felsch #include <linux/log2.h>
18cbebf5adSMarco Felsch #include <linux/module.h>
19cbebf5adSMarco Felsch #include <linux/of.h>
20cbebf5adSMarco Felsch #include <linux/regmap.h>
21cbebf5adSMarco Felsch
22cbebf5adSMarco Felsch /* Chip ID */
23cbebf5adSMarco Felsch #define QT1050_CHIP_ID 0x00
24cbebf5adSMarco Felsch #define QT1050_CHIP_ID_VER 0x46
25cbebf5adSMarco Felsch
26cbebf5adSMarco Felsch /* Firmware version */
27cbebf5adSMarco Felsch #define QT1050_FW_VERSION 0x01
28cbebf5adSMarco Felsch
29cbebf5adSMarco Felsch /* Detection status */
30cbebf5adSMarco Felsch #define QT1050_DET_STATUS 0x02
31cbebf5adSMarco Felsch
32cbebf5adSMarco Felsch /* Key status */
33cbebf5adSMarco Felsch #define QT1050_KEY_STATUS 0x03
34cbebf5adSMarco Felsch
35cbebf5adSMarco Felsch /* Key Signals */
36cbebf5adSMarco Felsch #define QT1050_KEY_SIGNAL_0_MSB 0x06
37cbebf5adSMarco Felsch #define QT1050_KEY_SIGNAL_0_LSB 0x07
38cbebf5adSMarco Felsch #define QT1050_KEY_SIGNAL_1_MSB 0x08
39cbebf5adSMarco Felsch #define QT1050_KEY_SIGNAL_1_LSB 0x09
40cbebf5adSMarco Felsch #define QT1050_KEY_SIGNAL_2_MSB 0x0c
41cbebf5adSMarco Felsch #define QT1050_KEY_SIGNAL_2_LSB 0x0d
42cbebf5adSMarco Felsch #define QT1050_KEY_SIGNAL_3_MSB 0x0e
43cbebf5adSMarco Felsch #define QT1050_KEY_SIGNAL_3_LSB 0x0f
44cbebf5adSMarco Felsch #define QT1050_KEY_SIGNAL_4_MSB 0x10
45cbebf5adSMarco Felsch #define QT1050_KEY_SIGNAL_4_LSB 0x11
46cbebf5adSMarco Felsch
47cbebf5adSMarco Felsch /* Reference data */
48cbebf5adSMarco Felsch #define QT1050_REF_DATA_0_MSB 0x14
49cbebf5adSMarco Felsch #define QT1050_REF_DATA_0_LSB 0x15
50cbebf5adSMarco Felsch #define QT1050_REF_DATA_1_MSB 0x16
51cbebf5adSMarco Felsch #define QT1050_REF_DATA_1_LSB 0x17
52cbebf5adSMarco Felsch #define QT1050_REF_DATA_2_MSB 0x1a
53cbebf5adSMarco Felsch #define QT1050_REF_DATA_2_LSB 0x1b
54cbebf5adSMarco Felsch #define QT1050_REF_DATA_3_MSB 0x1c
55cbebf5adSMarco Felsch #define QT1050_REF_DATA_3_LSB 0x1d
56cbebf5adSMarco Felsch #define QT1050_REF_DATA_4_MSB 0x1e
57cbebf5adSMarco Felsch #define QT1050_REF_DATA_4_LSB 0x1f
58cbebf5adSMarco Felsch
59cbebf5adSMarco Felsch /* Negative threshold level */
60cbebf5adSMarco Felsch #define QT1050_NTHR_0 0x21
61cbebf5adSMarco Felsch #define QT1050_NTHR_1 0x22
62cbebf5adSMarco Felsch #define QT1050_NTHR_2 0x24
63cbebf5adSMarco Felsch #define QT1050_NTHR_3 0x25
64cbebf5adSMarco Felsch #define QT1050_NTHR_4 0x26
65cbebf5adSMarco Felsch
66cbebf5adSMarco Felsch /* Pulse / Scale */
67cbebf5adSMarco Felsch #define QT1050_PULSE_SCALE_0 0x28
68cbebf5adSMarco Felsch #define QT1050_PULSE_SCALE_1 0x29
69cbebf5adSMarco Felsch #define QT1050_PULSE_SCALE_2 0x2b
70cbebf5adSMarco Felsch #define QT1050_PULSE_SCALE_3 0x2c
71cbebf5adSMarco Felsch #define QT1050_PULSE_SCALE_4 0x2d
72cbebf5adSMarco Felsch
73cbebf5adSMarco Felsch /* Detection integrator counter / AKS */
74cbebf5adSMarco Felsch #define QT1050_DI_AKS_0 0x2f
75cbebf5adSMarco Felsch #define QT1050_DI_AKS_1 0x30
76cbebf5adSMarco Felsch #define QT1050_DI_AKS_2 0x32
77cbebf5adSMarco Felsch #define QT1050_DI_AKS_3 0x33
78cbebf5adSMarco Felsch #define QT1050_DI_AKS_4 0x34
79cbebf5adSMarco Felsch
80cbebf5adSMarco Felsch /* Charge Share Delay */
81cbebf5adSMarco Felsch #define QT1050_CSD_0 0x36
82cbebf5adSMarco Felsch #define QT1050_CSD_1 0x37
83cbebf5adSMarco Felsch #define QT1050_CSD_2 0x39
84cbebf5adSMarco Felsch #define QT1050_CSD_3 0x3a
85cbebf5adSMarco Felsch #define QT1050_CSD_4 0x3b
86cbebf5adSMarco Felsch
87cbebf5adSMarco Felsch /* Low Power Mode */
88cbebf5adSMarco Felsch #define QT1050_LPMODE 0x3d
89cbebf5adSMarco Felsch
90cbebf5adSMarco Felsch /* Calibration and Reset */
91cbebf5adSMarco Felsch #define QT1050_RES_CAL 0x3f
92cbebf5adSMarco Felsch #define QT1050_RES_CAL_RESET BIT(7)
93cbebf5adSMarco Felsch #define QT1050_RES_CAL_CALIBRATE BIT(1)
94cbebf5adSMarco Felsch
95cbebf5adSMarco Felsch #define QT1050_MAX_KEYS 5
96cbebf5adSMarco Felsch #define QT1050_RESET_TIME 255
97cbebf5adSMarco Felsch
98cbebf5adSMarco Felsch struct qt1050_key_regs {
99cbebf5adSMarco Felsch unsigned int nthr;
100cbebf5adSMarco Felsch unsigned int pulse_scale;
101cbebf5adSMarco Felsch unsigned int di_aks;
102cbebf5adSMarco Felsch unsigned int csd;
103cbebf5adSMarco Felsch };
104cbebf5adSMarco Felsch
105cbebf5adSMarco Felsch struct qt1050_key {
106cbebf5adSMarco Felsch u32 num;
107cbebf5adSMarco Felsch u32 charge_delay;
108cbebf5adSMarco Felsch u32 thr_cnt;
109cbebf5adSMarco Felsch u32 samples;
110cbebf5adSMarco Felsch u32 scale;
111cbebf5adSMarco Felsch u32 keycode;
112cbebf5adSMarco Felsch };
113cbebf5adSMarco Felsch
114cbebf5adSMarco Felsch struct qt1050_priv {
115cbebf5adSMarco Felsch struct i2c_client *client;
116cbebf5adSMarco Felsch struct input_dev *input;
117cbebf5adSMarco Felsch struct regmap *regmap;
118cbebf5adSMarco Felsch struct qt1050_key keys[QT1050_MAX_KEYS];
119cbebf5adSMarco Felsch unsigned short keycodes[QT1050_MAX_KEYS];
120cbebf5adSMarco Felsch u8 reg_keys;
121cbebf5adSMarco Felsch u8 last_keys;
122cbebf5adSMarco Felsch };
123cbebf5adSMarco Felsch
124cbebf5adSMarco Felsch static const struct qt1050_key_regs qt1050_key_regs_data[] = {
125cbebf5adSMarco Felsch {
126cbebf5adSMarco Felsch .nthr = QT1050_NTHR_0,
127cbebf5adSMarco Felsch .pulse_scale = QT1050_PULSE_SCALE_0,
128cbebf5adSMarco Felsch .di_aks = QT1050_DI_AKS_0,
129cbebf5adSMarco Felsch .csd = QT1050_CSD_0,
130cbebf5adSMarco Felsch }, {
131cbebf5adSMarco Felsch .nthr = QT1050_NTHR_1,
132cbebf5adSMarco Felsch .pulse_scale = QT1050_PULSE_SCALE_1,
133cbebf5adSMarco Felsch .di_aks = QT1050_DI_AKS_1,
134cbebf5adSMarco Felsch .csd = QT1050_CSD_1,
135cbebf5adSMarco Felsch }, {
136cbebf5adSMarco Felsch .nthr = QT1050_NTHR_2,
137cbebf5adSMarco Felsch .pulse_scale = QT1050_PULSE_SCALE_2,
138cbebf5adSMarco Felsch .di_aks = QT1050_DI_AKS_2,
139cbebf5adSMarco Felsch .csd = QT1050_CSD_2,
140cbebf5adSMarco Felsch }, {
141cbebf5adSMarco Felsch .nthr = QT1050_NTHR_3,
142cbebf5adSMarco Felsch .pulse_scale = QT1050_PULSE_SCALE_3,
143cbebf5adSMarco Felsch .di_aks = QT1050_DI_AKS_3,
144cbebf5adSMarco Felsch .csd = QT1050_CSD_3,
145cbebf5adSMarco Felsch }, {
146cbebf5adSMarco Felsch .nthr = QT1050_NTHR_4,
147cbebf5adSMarco Felsch .pulse_scale = QT1050_PULSE_SCALE_4,
148cbebf5adSMarco Felsch .di_aks = QT1050_DI_AKS_4,
149cbebf5adSMarco Felsch .csd = QT1050_CSD_4,
150cbebf5adSMarco Felsch }
151cbebf5adSMarco Felsch };
152cbebf5adSMarco Felsch
qt1050_volatile_reg(struct device * dev,unsigned int reg)153cbebf5adSMarco Felsch static bool qt1050_volatile_reg(struct device *dev, unsigned int reg)
154cbebf5adSMarco Felsch {
155cbebf5adSMarco Felsch switch (reg) {
156cbebf5adSMarco Felsch case QT1050_DET_STATUS:
157cbebf5adSMarco Felsch case QT1050_KEY_STATUS:
158cbebf5adSMarco Felsch case QT1050_KEY_SIGNAL_0_MSB:
159cbebf5adSMarco Felsch case QT1050_KEY_SIGNAL_0_LSB:
160cbebf5adSMarco Felsch case QT1050_KEY_SIGNAL_1_MSB:
161cbebf5adSMarco Felsch case QT1050_KEY_SIGNAL_1_LSB:
162cbebf5adSMarco Felsch case QT1050_KEY_SIGNAL_2_MSB:
163cbebf5adSMarco Felsch case QT1050_KEY_SIGNAL_2_LSB:
164cbebf5adSMarco Felsch case QT1050_KEY_SIGNAL_3_MSB:
165cbebf5adSMarco Felsch case QT1050_KEY_SIGNAL_3_LSB:
166cbebf5adSMarco Felsch case QT1050_KEY_SIGNAL_4_MSB:
167cbebf5adSMarco Felsch case QT1050_KEY_SIGNAL_4_LSB:
168cbebf5adSMarco Felsch return true;
169cbebf5adSMarco Felsch default:
170cbebf5adSMarco Felsch return false;
171cbebf5adSMarco Felsch }
172cbebf5adSMarco Felsch }
173cbebf5adSMarco Felsch
174cbebf5adSMarco Felsch static const struct regmap_range qt1050_readable_ranges[] = {
175cbebf5adSMarco Felsch regmap_reg_range(QT1050_CHIP_ID, QT1050_KEY_STATUS),
176cbebf5adSMarco Felsch regmap_reg_range(QT1050_KEY_SIGNAL_0_MSB, QT1050_KEY_SIGNAL_1_LSB),
177cbebf5adSMarco Felsch regmap_reg_range(QT1050_KEY_SIGNAL_2_MSB, QT1050_KEY_SIGNAL_4_LSB),
178cbebf5adSMarco Felsch regmap_reg_range(QT1050_REF_DATA_0_MSB, QT1050_REF_DATA_1_LSB),
179cbebf5adSMarco Felsch regmap_reg_range(QT1050_REF_DATA_2_MSB, QT1050_REF_DATA_4_LSB),
180cbebf5adSMarco Felsch regmap_reg_range(QT1050_NTHR_0, QT1050_NTHR_1),
181cbebf5adSMarco Felsch regmap_reg_range(QT1050_NTHR_2, QT1050_NTHR_4),
182cbebf5adSMarco Felsch regmap_reg_range(QT1050_PULSE_SCALE_0, QT1050_PULSE_SCALE_1),
183cbebf5adSMarco Felsch regmap_reg_range(QT1050_PULSE_SCALE_2, QT1050_PULSE_SCALE_4),
184cbebf5adSMarco Felsch regmap_reg_range(QT1050_DI_AKS_0, QT1050_DI_AKS_1),
185cbebf5adSMarco Felsch regmap_reg_range(QT1050_DI_AKS_2, QT1050_DI_AKS_4),
186cbebf5adSMarco Felsch regmap_reg_range(QT1050_CSD_0, QT1050_CSD_1),
187cbebf5adSMarco Felsch regmap_reg_range(QT1050_CSD_2, QT1050_RES_CAL),
188cbebf5adSMarco Felsch };
189cbebf5adSMarco Felsch
190cbebf5adSMarco Felsch static const struct regmap_access_table qt1050_readable_table = {
191cbebf5adSMarco Felsch .yes_ranges = qt1050_readable_ranges,
192cbebf5adSMarco Felsch .n_yes_ranges = ARRAY_SIZE(qt1050_readable_ranges),
193cbebf5adSMarco Felsch };
194cbebf5adSMarco Felsch
195cbebf5adSMarco Felsch static const struct regmap_range qt1050_writeable_ranges[] = {
196cbebf5adSMarco Felsch regmap_reg_range(QT1050_NTHR_0, QT1050_NTHR_1),
197cbebf5adSMarco Felsch regmap_reg_range(QT1050_NTHR_2, QT1050_NTHR_4),
198cbebf5adSMarco Felsch regmap_reg_range(QT1050_PULSE_SCALE_0, QT1050_PULSE_SCALE_1),
199cbebf5adSMarco Felsch regmap_reg_range(QT1050_PULSE_SCALE_2, QT1050_PULSE_SCALE_4),
200cbebf5adSMarco Felsch regmap_reg_range(QT1050_DI_AKS_0, QT1050_DI_AKS_1),
201cbebf5adSMarco Felsch regmap_reg_range(QT1050_DI_AKS_2, QT1050_DI_AKS_4),
202cbebf5adSMarco Felsch regmap_reg_range(QT1050_CSD_0, QT1050_CSD_1),
203cbebf5adSMarco Felsch regmap_reg_range(QT1050_CSD_2, QT1050_RES_CAL),
204cbebf5adSMarco Felsch };
205cbebf5adSMarco Felsch
206cbebf5adSMarco Felsch static const struct regmap_access_table qt1050_writeable_table = {
207cbebf5adSMarco Felsch .yes_ranges = qt1050_writeable_ranges,
208cbebf5adSMarco Felsch .n_yes_ranges = ARRAY_SIZE(qt1050_writeable_ranges),
209cbebf5adSMarco Felsch };
210cbebf5adSMarco Felsch
211cbebf5adSMarco Felsch static struct regmap_config qt1050_regmap_config = {
212cbebf5adSMarco Felsch .reg_bits = 8,
213cbebf5adSMarco Felsch .val_bits = 8,
214cbebf5adSMarco Felsch .max_register = QT1050_RES_CAL,
215cbebf5adSMarco Felsch
216cbebf5adSMarco Felsch .cache_type = REGCACHE_RBTREE,
217cbebf5adSMarco Felsch
218cbebf5adSMarco Felsch .wr_table = &qt1050_writeable_table,
219cbebf5adSMarco Felsch .rd_table = &qt1050_readable_table,
220cbebf5adSMarco Felsch .volatile_reg = qt1050_volatile_reg,
221cbebf5adSMarco Felsch };
222cbebf5adSMarco Felsch
qt1050_identify(struct qt1050_priv * ts)223cbebf5adSMarco Felsch static bool qt1050_identify(struct qt1050_priv *ts)
224cbebf5adSMarco Felsch {
225cbebf5adSMarco Felsch unsigned int val;
226cbebf5adSMarco Felsch int err;
227cbebf5adSMarco Felsch
228cbebf5adSMarco Felsch /* Read Chip ID */
229cbebf5adSMarco Felsch regmap_read(ts->regmap, QT1050_CHIP_ID, &val);
230cbebf5adSMarco Felsch if (val != QT1050_CHIP_ID_VER) {
231cbebf5adSMarco Felsch dev_err(&ts->client->dev, "ID %d not supported\n", val);
232cbebf5adSMarco Felsch return false;
233cbebf5adSMarco Felsch }
234cbebf5adSMarco Felsch
235cbebf5adSMarco Felsch /* Read firmware version */
236cbebf5adSMarco Felsch err = regmap_read(ts->regmap, QT1050_FW_VERSION, &val);
237cbebf5adSMarco Felsch if (err) {
238cbebf5adSMarco Felsch dev_err(&ts->client->dev, "could not read the firmware version\n");
239cbebf5adSMarco Felsch return false;
240cbebf5adSMarco Felsch }
241cbebf5adSMarco Felsch
242cbebf5adSMarco Felsch dev_info(&ts->client->dev, "AT42QT1050 firmware version %1d.%1d\n",
243cbebf5adSMarco Felsch val >> 4, val & 0xf);
244cbebf5adSMarco Felsch
245cbebf5adSMarco Felsch return true;
246cbebf5adSMarco Felsch }
247cbebf5adSMarco Felsch
qt1050_irq_threaded(int irq,void * dev_id)248cbebf5adSMarco Felsch static irqreturn_t qt1050_irq_threaded(int irq, void *dev_id)
249cbebf5adSMarco Felsch {
250cbebf5adSMarco Felsch struct qt1050_priv *ts = dev_id;
251cbebf5adSMarco Felsch struct input_dev *input = ts->input;
252cbebf5adSMarco Felsch unsigned long new_keys, changed;
253cbebf5adSMarco Felsch unsigned int val;
254cbebf5adSMarco Felsch int i, err;
255cbebf5adSMarco Felsch
256cbebf5adSMarco Felsch /* Read the detected status register, thus clearing interrupt */
257cbebf5adSMarco Felsch err = regmap_read(ts->regmap, QT1050_DET_STATUS, &val);
258cbebf5adSMarco Felsch if (err) {
259cbebf5adSMarco Felsch dev_err(&ts->client->dev, "Fail to read detection status: %d\n",
260cbebf5adSMarco Felsch err);
261cbebf5adSMarco Felsch return IRQ_NONE;
262cbebf5adSMarco Felsch }
263cbebf5adSMarco Felsch
264cbebf5adSMarco Felsch /* Read which key changed, keys are not continuous */
265cbebf5adSMarco Felsch err = regmap_read(ts->regmap, QT1050_KEY_STATUS, &val);
266cbebf5adSMarco Felsch if (err) {
267cbebf5adSMarco Felsch dev_err(&ts->client->dev,
268cbebf5adSMarco Felsch "Fail to determine the key status: %d\n", err);
269cbebf5adSMarco Felsch return IRQ_NONE;
270cbebf5adSMarco Felsch }
271cbebf5adSMarco Felsch new_keys = (val & 0x70) >> 2 | (val & 0x6) >> 1;
272cbebf5adSMarco Felsch changed = ts->last_keys ^ new_keys;
273cbebf5adSMarco Felsch /* Report registered keys only */
274cbebf5adSMarco Felsch changed &= ts->reg_keys;
275cbebf5adSMarco Felsch
276cbebf5adSMarco Felsch for_each_set_bit(i, &changed, QT1050_MAX_KEYS)
277cbebf5adSMarco Felsch input_report_key(input, ts->keys[i].keycode,
278cbebf5adSMarco Felsch test_bit(i, &new_keys));
279cbebf5adSMarco Felsch
280cbebf5adSMarco Felsch ts->last_keys = new_keys;
281cbebf5adSMarco Felsch input_sync(input);
282cbebf5adSMarco Felsch
283cbebf5adSMarco Felsch return IRQ_HANDLED;
284cbebf5adSMarco Felsch }
285cbebf5adSMarco Felsch
qt1050_get_key_regs(int key_num)286cbebf5adSMarco Felsch static const struct qt1050_key_regs *qt1050_get_key_regs(int key_num)
287cbebf5adSMarco Felsch {
288cbebf5adSMarco Felsch return &qt1050_key_regs_data[key_num];
289cbebf5adSMarco Felsch }
290cbebf5adSMarco Felsch
qt1050_set_key(struct regmap * map,int number,int on)291cbebf5adSMarco Felsch static int qt1050_set_key(struct regmap *map, int number, int on)
292cbebf5adSMarco Felsch {
293cbebf5adSMarco Felsch const struct qt1050_key_regs *key_regs;
294cbebf5adSMarco Felsch
295cbebf5adSMarco Felsch key_regs = qt1050_get_key_regs(number);
296cbebf5adSMarco Felsch
297cbebf5adSMarco Felsch return regmap_update_bits(map, key_regs->di_aks, 0xfc,
298cbebf5adSMarco Felsch on ? BIT(4) : 0x00);
299cbebf5adSMarco Felsch }
300cbebf5adSMarco Felsch
qt1050_apply_fw_data(struct qt1050_priv * ts)301cbebf5adSMarco Felsch static int qt1050_apply_fw_data(struct qt1050_priv *ts)
302cbebf5adSMarco Felsch {
303cbebf5adSMarco Felsch struct regmap *map = ts->regmap;
304cbebf5adSMarco Felsch struct qt1050_key *button = &ts->keys[0];
305cbebf5adSMarco Felsch const struct qt1050_key_regs *key_regs;
306cbebf5adSMarco Felsch int i, err;
307cbebf5adSMarco Felsch
308cbebf5adSMarco Felsch /* Disable all keys and enable only the specified ones */
309cbebf5adSMarco Felsch for (i = 0; i < QT1050_MAX_KEYS; i++) {
310cbebf5adSMarco Felsch err = qt1050_set_key(map, i, 0);
311cbebf5adSMarco Felsch if (err)
312cbebf5adSMarco Felsch return err;
313cbebf5adSMarco Felsch }
314cbebf5adSMarco Felsch
315cbebf5adSMarco Felsch for (i = 0; i < QT1050_MAX_KEYS; i++, button++) {
316cbebf5adSMarco Felsch /* Keep KEY_RESERVED keys off */
317cbebf5adSMarco Felsch if (button->keycode == KEY_RESERVED)
318cbebf5adSMarco Felsch continue;
319cbebf5adSMarco Felsch
320cbebf5adSMarco Felsch err = qt1050_set_key(map, button->num, 1);
321cbebf5adSMarco Felsch if (err)
322cbebf5adSMarco Felsch return err;
323cbebf5adSMarco Felsch
324cbebf5adSMarco Felsch key_regs = qt1050_get_key_regs(button->num);
325cbebf5adSMarco Felsch
326cbebf5adSMarco Felsch err = regmap_write(map, key_regs->pulse_scale,
327cbebf5adSMarco Felsch (button->samples << 4) | (button->scale));
328cbebf5adSMarco Felsch if (err)
329cbebf5adSMarco Felsch return err;
330cbebf5adSMarco Felsch err = regmap_write(map, key_regs->csd, button->charge_delay);
331cbebf5adSMarco Felsch if (err)
332cbebf5adSMarco Felsch return err;
333cbebf5adSMarco Felsch err = regmap_write(map, key_regs->nthr, button->thr_cnt);
334cbebf5adSMarco Felsch if (err)
335cbebf5adSMarco Felsch return err;
336cbebf5adSMarco Felsch }
337cbebf5adSMarco Felsch
338cbebf5adSMarco Felsch return 0;
339cbebf5adSMarco Felsch }
340cbebf5adSMarco Felsch
qt1050_parse_fw(struct qt1050_priv * ts)341cbebf5adSMarco Felsch static int qt1050_parse_fw(struct qt1050_priv *ts)
342cbebf5adSMarco Felsch {
343cbebf5adSMarco Felsch struct device *dev = &ts->client->dev;
344cbebf5adSMarco Felsch struct fwnode_handle *child;
345cbebf5adSMarco Felsch int nbuttons;
346cbebf5adSMarco Felsch
347cbebf5adSMarco Felsch nbuttons = device_get_child_node_count(dev);
348cbebf5adSMarco Felsch if (nbuttons == 0 || nbuttons > QT1050_MAX_KEYS)
349cbebf5adSMarco Felsch return -ENODEV;
350cbebf5adSMarco Felsch
351cbebf5adSMarco Felsch device_for_each_child_node(dev, child) {
352cbebf5adSMarco Felsch struct qt1050_key button;
353cbebf5adSMarco Felsch
354cbebf5adSMarco Felsch /* Required properties */
355cbebf5adSMarco Felsch if (fwnode_property_read_u32(child, "linux,code",
356cbebf5adSMarco Felsch &button.keycode)) {
357cbebf5adSMarco Felsch dev_err(dev, "Button without keycode\n");
358cbebf5adSMarco Felsch goto err;
359cbebf5adSMarco Felsch }
360cbebf5adSMarco Felsch if (button.keycode >= KEY_MAX) {
361cbebf5adSMarco Felsch dev_err(dev, "Invalid keycode 0x%x\n",
362cbebf5adSMarco Felsch button.keycode);
363cbebf5adSMarco Felsch goto err;
364cbebf5adSMarco Felsch }
365cbebf5adSMarco Felsch
366cbebf5adSMarco Felsch if (fwnode_property_read_u32(child, "reg",
367cbebf5adSMarco Felsch &button.num)) {
368cbebf5adSMarco Felsch dev_err(dev, "Button without pad number\n");
369cbebf5adSMarco Felsch goto err;
370cbebf5adSMarco Felsch }
371cbebf5adSMarco Felsch if (button.num < 0 || button.num > QT1050_MAX_KEYS - 1)
372cbebf5adSMarco Felsch goto err;
373cbebf5adSMarco Felsch
374cbebf5adSMarco Felsch ts->reg_keys |= BIT(button.num);
375cbebf5adSMarco Felsch
376cbebf5adSMarco Felsch /* Optional properties */
377cbebf5adSMarco Felsch if (fwnode_property_read_u32(child,
378cbebf5adSMarco Felsch "microchip,pre-charge-time-ns",
379cbebf5adSMarco Felsch &button.charge_delay)) {
380cbebf5adSMarco Felsch button.charge_delay = 0;
381cbebf5adSMarco Felsch } else {
382cbebf5adSMarco Felsch if (button.charge_delay % 2500 == 0)
383cbebf5adSMarco Felsch button.charge_delay =
384cbebf5adSMarco Felsch button.charge_delay / 2500;
385cbebf5adSMarco Felsch else
386cbebf5adSMarco Felsch button.charge_delay = 0;
387cbebf5adSMarco Felsch }
388cbebf5adSMarco Felsch
389cbebf5adSMarco Felsch if (fwnode_property_read_u32(child, "microchip,average-samples",
390cbebf5adSMarco Felsch &button.samples)) {
391cbebf5adSMarco Felsch button.samples = 0;
392cbebf5adSMarco Felsch } else {
393cbebf5adSMarco Felsch if (is_power_of_2(button.samples))
394cbebf5adSMarco Felsch button.samples = ilog2(button.samples);
395cbebf5adSMarco Felsch else
396cbebf5adSMarco Felsch button.samples = 0;
397cbebf5adSMarco Felsch }
398cbebf5adSMarco Felsch
399cbebf5adSMarco Felsch if (fwnode_property_read_u32(child, "microchip,average-scaling",
400cbebf5adSMarco Felsch &button.scale)) {
401cbebf5adSMarco Felsch button.scale = 0;
402cbebf5adSMarco Felsch } else {
403cbebf5adSMarco Felsch if (is_power_of_2(button.scale))
404cbebf5adSMarco Felsch button.scale = ilog2(button.scale);
405cbebf5adSMarco Felsch else
406cbebf5adSMarco Felsch button.scale = 0;
407cbebf5adSMarco Felsch
408cbebf5adSMarco Felsch }
409cbebf5adSMarco Felsch
410cbebf5adSMarco Felsch if (fwnode_property_read_u32(child, "microchip,threshold",
411cbebf5adSMarco Felsch &button.thr_cnt)) {
412cbebf5adSMarco Felsch button.thr_cnt = 20;
413cbebf5adSMarco Felsch } else {
414cbebf5adSMarco Felsch if (button.thr_cnt > 255)
415cbebf5adSMarco Felsch button.thr_cnt = 20;
416cbebf5adSMarco Felsch }
417cbebf5adSMarco Felsch
418cbebf5adSMarco Felsch ts->keys[button.num] = button;
419cbebf5adSMarco Felsch }
420cbebf5adSMarco Felsch
421cbebf5adSMarco Felsch return 0;
422cbebf5adSMarco Felsch
423cbebf5adSMarco Felsch err:
424cbebf5adSMarco Felsch fwnode_handle_put(child);
425cbebf5adSMarco Felsch return -EINVAL;
426cbebf5adSMarco Felsch }
427cbebf5adSMarco Felsch
qt1050_probe(struct i2c_client * client)428cbebf5adSMarco Felsch static int qt1050_probe(struct i2c_client *client)
429cbebf5adSMarco Felsch {
430cbebf5adSMarco Felsch struct qt1050_priv *ts;
431cbebf5adSMarco Felsch struct input_dev *input;
432cbebf5adSMarco Felsch struct device *dev = &client->dev;
433cbebf5adSMarco Felsch struct regmap *map;
434cbebf5adSMarco Felsch unsigned int status, i;
435cbebf5adSMarco Felsch int err;
436cbebf5adSMarco Felsch
437cbebf5adSMarco Felsch /* Check basic functionality */
438cbebf5adSMarco Felsch err = i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE);
439cbebf5adSMarco Felsch if (!err) {
440cbebf5adSMarco Felsch dev_err(&client->dev, "%s adapter not supported\n",
441cbebf5adSMarco Felsch dev_driver_string(&client->adapter->dev));
442cbebf5adSMarco Felsch return -ENODEV;
443cbebf5adSMarco Felsch }
444cbebf5adSMarco Felsch
445cbebf5adSMarco Felsch if (!client->irq) {
446cbebf5adSMarco Felsch dev_err(dev, "assign a irq line to this device\n");
447cbebf5adSMarco Felsch return -EINVAL;
448cbebf5adSMarco Felsch }
449cbebf5adSMarco Felsch
450cbebf5adSMarco Felsch ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
451cbebf5adSMarco Felsch if (!ts)
452cbebf5adSMarco Felsch return -ENOMEM;
453cbebf5adSMarco Felsch
454cbebf5adSMarco Felsch input = devm_input_allocate_device(dev);
455cbebf5adSMarco Felsch if (!input)
456cbebf5adSMarco Felsch return -ENOMEM;
457cbebf5adSMarco Felsch
458cbebf5adSMarco Felsch map = devm_regmap_init_i2c(client, &qt1050_regmap_config);
459cbebf5adSMarco Felsch if (IS_ERR(map))
460cbebf5adSMarco Felsch return PTR_ERR(map);
461cbebf5adSMarco Felsch
462cbebf5adSMarco Felsch ts->client = client;
463cbebf5adSMarco Felsch ts->input = input;
464cbebf5adSMarco Felsch ts->regmap = map;
465cbebf5adSMarco Felsch
466cbebf5adSMarco Felsch i2c_set_clientdata(client, ts);
467cbebf5adSMarco Felsch
468cbebf5adSMarco Felsch /* Identify the qt1050 chip */
469cbebf5adSMarco Felsch if (!qt1050_identify(ts))
470cbebf5adSMarco Felsch return -ENODEV;
471cbebf5adSMarco Felsch
472cbebf5adSMarco Felsch /* Get pdata */
473cbebf5adSMarco Felsch err = qt1050_parse_fw(ts);
474cbebf5adSMarco Felsch if (err) {
475cbebf5adSMarco Felsch dev_err(dev, "Failed to parse firmware: %d\n", err);
476cbebf5adSMarco Felsch return err;
477cbebf5adSMarco Felsch }
478cbebf5adSMarco Felsch
479cbebf5adSMarco Felsch input->name = "AT42QT1050 QTouch Sensor";
480cbebf5adSMarco Felsch input->dev.parent = &client->dev;
481cbebf5adSMarco Felsch input->id.bustype = BUS_I2C;
482cbebf5adSMarco Felsch
483cbebf5adSMarco Felsch /* Add the keycode */
484cbebf5adSMarco Felsch input->keycode = ts->keycodes;
485cbebf5adSMarco Felsch input->keycodesize = sizeof(ts->keycodes[0]);
486cbebf5adSMarco Felsch input->keycodemax = QT1050_MAX_KEYS;
487cbebf5adSMarco Felsch
488cbebf5adSMarco Felsch __set_bit(EV_KEY, input->evbit);
489cbebf5adSMarco Felsch for (i = 0; i < QT1050_MAX_KEYS; i++) {
490cbebf5adSMarco Felsch ts->keycodes[i] = ts->keys[i].keycode;
491cbebf5adSMarco Felsch __set_bit(ts->keycodes[i], input->keybit);
492cbebf5adSMarco Felsch }
493cbebf5adSMarco Felsch
494cbebf5adSMarco Felsch /* Trigger re-calibration */
495cbebf5adSMarco Felsch err = regmap_update_bits(ts->regmap, QT1050_RES_CAL, 0x7f,
496cbebf5adSMarco Felsch QT1050_RES_CAL_CALIBRATE);
497cbebf5adSMarco Felsch if (err) {
498cbebf5adSMarco Felsch dev_err(dev, "Trigger calibration failed: %d\n", err);
499cbebf5adSMarco Felsch return err;
500cbebf5adSMarco Felsch }
501cbebf5adSMarco Felsch err = regmap_read_poll_timeout(ts->regmap, QT1050_DET_STATUS, status,
502cbebf5adSMarco Felsch status >> 7 == 1, 10000, 200000);
503cbebf5adSMarco Felsch if (err) {
504cbebf5adSMarco Felsch dev_err(dev, "Calibration failed: %d\n", err);
505cbebf5adSMarco Felsch return err;
506cbebf5adSMarco Felsch }
507cbebf5adSMarco Felsch
508cbebf5adSMarco Felsch /* Soft reset to set defaults */
509cbebf5adSMarco Felsch err = regmap_update_bits(ts->regmap, QT1050_RES_CAL,
510cbebf5adSMarco Felsch QT1050_RES_CAL_RESET, QT1050_RES_CAL_RESET);
511cbebf5adSMarco Felsch if (err) {
512cbebf5adSMarco Felsch dev_err(dev, "Trigger soft reset failed: %d\n", err);
513cbebf5adSMarco Felsch return err;
514cbebf5adSMarco Felsch }
515cbebf5adSMarco Felsch msleep(QT1050_RESET_TIME);
516cbebf5adSMarco Felsch
517cbebf5adSMarco Felsch /* Set pdata */
518cbebf5adSMarco Felsch err = qt1050_apply_fw_data(ts);
519cbebf5adSMarco Felsch if (err) {
520cbebf5adSMarco Felsch dev_err(dev, "Failed to set firmware data: %d\n", err);
521cbebf5adSMarco Felsch return err;
522cbebf5adSMarco Felsch }
523cbebf5adSMarco Felsch
524cbebf5adSMarco Felsch err = devm_request_threaded_irq(dev, client->irq, NULL,
525cbebf5adSMarco Felsch qt1050_irq_threaded, IRQF_ONESHOT,
526cbebf5adSMarco Felsch "qt1050", ts);
527cbebf5adSMarco Felsch if (err) {
528cbebf5adSMarco Felsch dev_err(&client->dev, "Failed to request irq: %d\n", err);
529cbebf5adSMarco Felsch return err;
530cbebf5adSMarco Felsch }
531cbebf5adSMarco Felsch
532cbebf5adSMarco Felsch /* Clear #CHANGE line */
533cbebf5adSMarco Felsch err = regmap_read(ts->regmap, QT1050_DET_STATUS, &status);
534cbebf5adSMarco Felsch if (err) {
535cbebf5adSMarco Felsch dev_err(dev, "Failed to clear #CHANGE line level: %d\n", err);
536cbebf5adSMarco Felsch return err;
537cbebf5adSMarco Felsch }
538cbebf5adSMarco Felsch
539cbebf5adSMarco Felsch /* Register the input device */
540cbebf5adSMarco Felsch err = input_register_device(ts->input);
541cbebf5adSMarco Felsch if (err) {
542cbebf5adSMarco Felsch dev_err(&client->dev, "Failed to register input device: %d\n",
543cbebf5adSMarco Felsch err);
544cbebf5adSMarco Felsch return err;
545cbebf5adSMarco Felsch }
546cbebf5adSMarco Felsch
547cbebf5adSMarco Felsch return 0;
548cbebf5adSMarco Felsch }
549cbebf5adSMarco Felsch
qt1050_suspend(struct device * dev)550ffa5d80fSJonathan Cameron static int qt1050_suspend(struct device *dev)
551cbebf5adSMarco Felsch {
552cbebf5adSMarco Felsch struct i2c_client *client = to_i2c_client(dev);
553cbebf5adSMarco Felsch struct qt1050_priv *ts = i2c_get_clientdata(client);
554cbebf5adSMarco Felsch
555cbebf5adSMarco Felsch disable_irq(client->irq);
556cbebf5adSMarco Felsch
557cbebf5adSMarco Felsch /*
558cbebf5adSMarco Felsch * Set measurement interval to 1s (125 x 8ms) if wakeup is allowed
559cbebf5adSMarco Felsch * else turn off. The 1s interval seems to be a good compromise between
560cbebf5adSMarco Felsch * low power and response time.
561cbebf5adSMarco Felsch */
562cbebf5adSMarco Felsch return regmap_write(ts->regmap, QT1050_LPMODE,
563cbebf5adSMarco Felsch device_may_wakeup(dev) ? 125 : 0);
564cbebf5adSMarco Felsch }
565cbebf5adSMarco Felsch
qt1050_resume(struct device * dev)566ffa5d80fSJonathan Cameron static int qt1050_resume(struct device *dev)
567cbebf5adSMarco Felsch {
568cbebf5adSMarco Felsch struct i2c_client *client = to_i2c_client(dev);
569cbebf5adSMarco Felsch struct qt1050_priv *ts = i2c_get_clientdata(client);
570cbebf5adSMarco Felsch
571cbebf5adSMarco Felsch enable_irq(client->irq);
572cbebf5adSMarco Felsch
573cbebf5adSMarco Felsch /* Set measurement interval back to 16ms (2 x 8ms) */
574cbebf5adSMarco Felsch return regmap_write(ts->regmap, QT1050_LPMODE, 2);
575cbebf5adSMarco Felsch }
576cbebf5adSMarco Felsch
577ffa5d80fSJonathan Cameron static DEFINE_SIMPLE_DEV_PM_OPS(qt1050_pm_ops, qt1050_suspend, qt1050_resume);
578cbebf5adSMarco Felsch
579cbebf5adSMarco Felsch static const struct of_device_id __maybe_unused qt1050_of_match[] = {
580cbebf5adSMarco Felsch { .compatible = "microchip,qt1050", },
581cbebf5adSMarco Felsch { },
582cbebf5adSMarco Felsch };
583cbebf5adSMarco Felsch MODULE_DEVICE_TABLE(of, qt1050_of_match);
584cbebf5adSMarco Felsch
585cbebf5adSMarco Felsch static struct i2c_driver qt1050_driver = {
586cbebf5adSMarco Felsch .driver = {
587cbebf5adSMarco Felsch .name = "qt1050",
588cbebf5adSMarco Felsch .of_match_table = of_match_ptr(qt1050_of_match),
589ffa5d80fSJonathan Cameron .pm = pm_sleep_ptr(&qt1050_pm_ops),
590cbebf5adSMarco Felsch },
591*d8bde56dSUwe Kleine-König .probe = qt1050_probe,
592cbebf5adSMarco Felsch };
593cbebf5adSMarco Felsch
594cbebf5adSMarco Felsch module_i2c_driver(qt1050_driver);
595cbebf5adSMarco Felsch
596cbebf5adSMarco Felsch MODULE_AUTHOR("Marco Felsch <kernel@pengutronix.de");
597cbebf5adSMarco Felsch MODULE_DESCRIPTION("Driver for AT42QT1050 QTouch sensor");
598cbebf5adSMarco Felsch MODULE_LICENSE("GPL v2");
599