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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Azoteq IQS626A Capacitive Touch Controller
4 *
5 * Copyright (C) 2020 Jeff LaBundy <jeff@labundy.com>
6 *
7 * This driver registers up to 2 input devices: one representing capacitive or
8 * inductive keys as well as Hall-effect switches, and one for a trackpad that
9 * can express various gestures.
10 */
11
12#include <linux/bits.h>
13#include <linux/completion.h>
14#include <linux/delay.h>
15#include <linux/device.h>
16#include <linux/err.h>
17#include <linux/i2c.h>
18#include <linux/input.h>
19#include <linux/input/touchscreen.h>
20#include <linux/interrupt.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/of_device.h>
24#include <linux/property.h>
25#include <linux/regmap.h>
26#include <linux/slab.h>
27
28#define IQS626_VER_INFO 0x00
29#define IQS626_VER_INFO_PROD_NUM 0x51
30
31#define IQS626_SYS_FLAGS 0x02
32#define IQS626_SYS_FLAGS_SHOW_RESET BIT(15)
33#define IQS626_SYS_FLAGS_IN_ATI BIT(12)
34#define IQS626_SYS_FLAGS_PWR_MODE_MASK GENMASK(9, 8)
35#define IQS626_SYS_FLAGS_PWR_MODE_SHIFT 8
36
37#define IQS626_HALL_OUTPUT 0x23
38
39#define IQS626_SYS_SETTINGS 0x80
40#define IQS626_SYS_SETTINGS_CLK_DIV BIT(15)
41#define IQS626_SYS_SETTINGS_ULP_AUTO BIT(14)
42#define IQS626_SYS_SETTINGS_DIS_AUTO BIT(13)
43#define IQS626_SYS_SETTINGS_PWR_MODE_MASK GENMASK(12, 11)
44#define IQS626_SYS_SETTINGS_PWR_MODE_SHIFT 11
45#define IQS626_SYS_SETTINGS_PWR_MODE_MAX 3
46#define IQS626_SYS_SETTINGS_ULP_UPDATE_MASK GENMASK(10, 8)
47#define IQS626_SYS_SETTINGS_ULP_UPDATE_SHIFT 8
48#define IQS626_SYS_SETTINGS_ULP_UPDATE_MAX 7
49#define IQS626_SYS_SETTINGS_EVENT_MODE BIT(5)
50#define IQS626_SYS_SETTINGS_EVENT_MODE_LP BIT(4)
51#define IQS626_SYS_SETTINGS_REDO_ATI BIT(2)
52#define IQS626_SYS_SETTINGS_ACK_RESET BIT(0)
53
54#define IQS626_MISC_A_ATI_BAND_DISABLE BIT(7)
55#define IQS626_MISC_A_TPx_LTA_UPDATE_MASK GENMASK(6, 4)
56#define IQS626_MISC_A_TPx_LTA_UPDATE_SHIFT 4
57#define IQS626_MISC_A_TPx_LTA_UPDATE_MAX 7
58#define IQS626_MISC_A_ATI_LP_ONLY BIT(3)
59#define IQS626_MISC_A_GPIO3_SELECT_MASK GENMASK(2, 0)
60#define IQS626_MISC_A_GPIO3_SELECT_MAX 7
61
62#define IQS626_EVENT_MASK_SYS BIT(6)
63#define IQS626_EVENT_MASK_GESTURE BIT(3)
64#define IQS626_EVENT_MASK_DEEP BIT(2)
65#define IQS626_EVENT_MASK_TOUCH BIT(1)
66#define IQS626_EVENT_MASK_PROX BIT(0)
67
68#define IQS626_RATE_NP_MS_MAX 255
69#define IQS626_RATE_LP_MS_MAX 255
70#define IQS626_RATE_ULP_MS_MAX 4080
71#define IQS626_TIMEOUT_PWR_MS_MAX 130560
72#define IQS626_TIMEOUT_LTA_MS_MAX 130560
73
74#define IQS626_MISC_B_RESEED_UI_SEL_MASK GENMASK(7, 6)
75#define IQS626_MISC_B_RESEED_UI_SEL_SHIFT 6
76#define IQS626_MISC_B_RESEED_UI_SEL_MAX 3
77#define IQS626_MISC_B_THRESH_EXTEND BIT(5)
78#define IQS626_MISC_B_TRACKING_UI_ENABLE BIT(4)
79#define IQS626_MISC_B_TPx_SWIPE BIT(3)
80#define IQS626_MISC_B_RESEED_OFFSET BIT(2)
81#define IQS626_MISC_B_FILT_STR_TPx GENMASK(1, 0)
82
83#define IQS626_THRESH_SWIPE_MAX 255
84#define IQS626_TIMEOUT_TAP_MS_MAX 4080
85#define IQS626_TIMEOUT_SWIPE_MS_MAX 4080
86
87#define IQS626_CHx_ENG_0_MEAS_CAP_SIZE BIT(7)
88#define IQS626_CHx_ENG_0_RX_TERM_VSS BIT(5)
89#define IQS626_CHx_ENG_0_LINEARIZE BIT(4)
90#define IQS626_CHx_ENG_0_DUAL_DIR BIT(3)
91#define IQS626_CHx_ENG_0_FILT_DISABLE BIT(2)
92#define IQS626_CHx_ENG_0_ATI_MODE_MASK GENMASK(1, 0)
93#define IQS626_CHx_ENG_0_ATI_MODE_MAX 3
94
95#define IQS626_CHx_ENG_1_CCT_HIGH_1 BIT(7)
96#define IQS626_CHx_ENG_1_CCT_HIGH_0 BIT(6)
97#define IQS626_CHx_ENG_1_PROJ_BIAS_MASK GENMASK(5, 4)
98#define IQS626_CHx_ENG_1_PROJ_BIAS_SHIFT 4
99#define IQS626_CHx_ENG_1_PROJ_BIAS_MAX 3
100#define IQS626_CHx_ENG_1_CCT_ENABLE BIT(3)
101#define IQS626_CHx_ENG_1_SENSE_FREQ_MASK GENMASK(2, 1)
102#define IQS626_CHx_ENG_1_SENSE_FREQ_SHIFT 1
103#define IQS626_CHx_ENG_1_SENSE_FREQ_MAX 3
104#define IQS626_CHx_ENG_1_ATI_BAND_TIGHTEN BIT(0)
105
106#define IQS626_CHx_ENG_2_LOCAL_CAP_MASK GENMASK(7, 6)
107#define IQS626_CHx_ENG_2_LOCAL_CAP_SHIFT 6
108#define IQS626_CHx_ENG_2_LOCAL_CAP_MAX 3
109#define IQS626_CHx_ENG_2_LOCAL_CAP_ENABLE BIT(5)
110#define IQS626_CHx_ENG_2_SENSE_MODE_MASK GENMASK(3, 0)
111#define IQS626_CHx_ENG_2_SENSE_MODE_MAX 15
112
113#define IQS626_CHx_ENG_3_TX_FREQ_MASK GENMASK(5, 4)
114#define IQS626_CHx_ENG_3_TX_FREQ_SHIFT 4
115#define IQS626_CHx_ENG_3_TX_FREQ_MAX 3
116#define IQS626_CHx_ENG_3_INV_LOGIC BIT(0)
117
118#define IQS626_CHx_ENG_4_RX_TERM_VREG BIT(6)
119#define IQS626_CHx_ENG_4_CCT_LOW_1 BIT(5)
120#define IQS626_CHx_ENG_4_CCT_LOW_0 BIT(4)
121#define IQS626_CHx_ENG_4_COMP_DISABLE BIT(1)
122#define IQS626_CHx_ENG_4_STATIC_ENABLE BIT(0)
123
124#define IQS626_TPx_ATI_BASE_MIN 45
125#define IQS626_TPx_ATI_BASE_MAX 300
126#define IQS626_CHx_ATI_BASE_MASK GENMASK(7, 6)
127#define IQS626_CHx_ATI_BASE_75 0x00
128#define IQS626_CHx_ATI_BASE_100 0x40
129#define IQS626_CHx_ATI_BASE_150 0x80
130#define IQS626_CHx_ATI_BASE_200 0xC0
131#define IQS626_CHx_ATI_TARGET_MASK GENMASK(5, 0)
132#define IQS626_CHx_ATI_TARGET_MAX 2016
133
134#define IQS626_CHx_THRESH_MAX 255
135#define IQS626_CHx_HYST_DEEP_MASK GENMASK(7, 4)
136#define IQS626_CHx_HYST_DEEP_SHIFT 4
137#define IQS626_CHx_HYST_TOUCH_MASK GENMASK(3, 0)
138#define IQS626_CHx_HYST_MAX 15
139
140#define IQS626_FILT_STR_NP_TPx_MASK GENMASK(7, 6)
141#define IQS626_FILT_STR_NP_TPx_SHIFT 6
142#define IQS626_FILT_STR_LP_TPx_MASK GENMASK(5, 4)
143#define IQS626_FILT_STR_LP_TPx_SHIFT 4
144
145#define IQS626_FILT_STR_NP_CNT_MASK GENMASK(7, 6)
146#define IQS626_FILT_STR_NP_CNT_SHIFT 6
147#define IQS626_FILT_STR_LP_CNT_MASK GENMASK(5, 4)
148#define IQS626_FILT_STR_LP_CNT_SHIFT 4
149#define IQS626_FILT_STR_NP_LTA_MASK GENMASK(3, 2)
150#define IQS626_FILT_STR_NP_LTA_SHIFT 2
151#define IQS626_FILT_STR_LP_LTA_MASK GENMASK(1, 0)
152#define IQS626_FILT_STR_MAX 3
153
154#define IQS626_ULP_PROJ_ENABLE BIT(4)
155#define IQS626_GEN_WEIGHT_MAX 255
156
157#define IQS626_MAX_REG 0xFF
158
159#define IQS626_NUM_CH_TP_3 9
160#define IQS626_NUM_CH_TP_2 6
161#define IQS626_NUM_CH_GEN 3
162#define IQS626_NUM_CRx_TX 8
163
164#define IQS626_PWR_MODE_POLL_SLEEP_US 50000
165#define IQS626_PWR_MODE_POLL_TIMEOUT_US 500000
166
167#define iqs626_irq_wait() usleep_range(350, 400)
168
169enum iqs626_ch_id {
170 IQS626_CH_ULP_0,
171 IQS626_CH_TP_2,
172 IQS626_CH_TP_3,
173 IQS626_CH_GEN_0,
174 IQS626_CH_GEN_1,
175 IQS626_CH_GEN_2,
176 IQS626_CH_HALL,
177};
178
179enum iqs626_rx_inactive {
180 IQS626_RX_INACTIVE_VSS,
181 IQS626_RX_INACTIVE_FLOAT,
182 IQS626_RX_INACTIVE_VREG,
183};
184
185enum iqs626_st_offs {
186 IQS626_ST_OFFS_PROX,
187 IQS626_ST_OFFS_DIR,
188 IQS626_ST_OFFS_TOUCH,
189 IQS626_ST_OFFS_DEEP,
190};
191
192enum iqs626_th_offs {
193 IQS626_TH_OFFS_PROX,
194 IQS626_TH_OFFS_TOUCH,
195 IQS626_TH_OFFS_DEEP,
196};
197
198enum iqs626_event_id {
199 IQS626_EVENT_PROX_DN,
200 IQS626_EVENT_PROX_UP,
201 IQS626_EVENT_TOUCH_DN,
202 IQS626_EVENT_TOUCH_UP,
203 IQS626_EVENT_DEEP_DN,
204 IQS626_EVENT_DEEP_UP,
205};
206
207enum iqs626_gesture_id {
208 IQS626_GESTURE_FLICK_X_POS,
209 IQS626_GESTURE_FLICK_X_NEG,
210 IQS626_GESTURE_FLICK_Y_POS,
211 IQS626_GESTURE_FLICK_Y_NEG,
212 IQS626_GESTURE_TAP,
213 IQS626_GESTURE_HOLD,
214 IQS626_NUM_GESTURES,
215};
216
217struct iqs626_event_desc {
218 const char *name;
219 enum iqs626_st_offs st_offs;
220 enum iqs626_th_offs th_offs;
221 bool dir_up;
222 u8 mask;
223};
224
225static const struct iqs626_event_desc iqs626_events[] = {
226 [IQS626_EVENT_PROX_DN] = {
227 .name = "event-prox",
228 .st_offs = IQS626_ST_OFFS_PROX,
229 .th_offs = IQS626_TH_OFFS_PROX,
230 .mask = IQS626_EVENT_MASK_PROX,
231 },
232 [IQS626_EVENT_PROX_UP] = {
233 .name = "event-prox-alt",
234 .st_offs = IQS626_ST_OFFS_PROX,
235 .th_offs = IQS626_TH_OFFS_PROX,
236 .dir_up = true,
237 .mask = IQS626_EVENT_MASK_PROX,
238 },
239 [IQS626_EVENT_TOUCH_DN] = {
240 .name = "event-touch",
241 .st_offs = IQS626_ST_OFFS_TOUCH,
242 .th_offs = IQS626_TH_OFFS_TOUCH,
243 .mask = IQS626_EVENT_MASK_TOUCH,
244 },
245 [IQS626_EVENT_TOUCH_UP] = {
246 .name = "event-touch-alt",
247 .st_offs = IQS626_ST_OFFS_TOUCH,
248 .th_offs = IQS626_TH_OFFS_TOUCH,
249 .dir_up = true,
250 .mask = IQS626_EVENT_MASK_TOUCH,
251 },
252 [IQS626_EVENT_DEEP_DN] = {
253 .name = "event-deep",
254 .st_offs = IQS626_ST_OFFS_DEEP,
255 .th_offs = IQS626_TH_OFFS_DEEP,
256 .mask = IQS626_EVENT_MASK_DEEP,
257 },
258 [IQS626_EVENT_DEEP_UP] = {
259 .name = "event-deep-alt",
260 .st_offs = IQS626_ST_OFFS_DEEP,
261 .th_offs = IQS626_TH_OFFS_DEEP,
262 .dir_up = true,
263 .mask = IQS626_EVENT_MASK_DEEP,
264 },
265};
266
267struct iqs626_ver_info {
268 u8 prod_num;
269 u8 sw_num;
270 u8 hw_num;
271 u8 padding;
272} __packed;
273
274struct iqs626_flags {
275 __be16 system;
276 u8 gesture;
277 u8 padding_a;
278 u8 states[4];
279 u8 ref_active;
280 u8 padding_b;
281 u8 comp_min;
282 u8 comp_max;
283 u8 trackpad_x;
284 u8 trackpad_y;
285} __packed;
286
287struct iqs626_ch_reg_ulp {
288 u8 thresh[2];
289 u8 hyst;
290 u8 filter;
291 u8 engine[2];
292 u8 ati_target;
293 u8 padding;
294 __be16 ati_comp;
295 u8 rx_enable;
296 u8 tx_enable;
297} __packed;
298
299struct iqs626_ch_reg_tp {
300 u8 thresh;
301 u8 ati_base;
302 __be16 ati_comp;
303} __packed;
304
305struct iqs626_tp_grp_reg {
306 u8 hyst;
307 u8 ati_target;
308 u8 engine[2];
309 struct iqs626_ch_reg_tp ch_reg_tp[IQS626_NUM_CH_TP_3];
310} __packed;
311
312struct iqs626_ch_reg_gen {
313 u8 thresh[3];
314 u8 padding;
315 u8 hyst;
316 u8 ati_target;
317 __be16 ati_comp;
318 u8 engine[5];
319 u8 filter;
320 u8 rx_enable;
321 u8 tx_enable;
322 u8 assoc_select;
323 u8 assoc_weight;
324} __packed;
325
326struct iqs626_ch_reg_hall {
327 u8 engine;
328 u8 thresh;
329 u8 hyst;
330 u8 ati_target;
331 __be16 ati_comp;
332} __packed;
333
334struct iqs626_sys_reg {
335 __be16 general;
336 u8 misc_a;
337 u8 event_mask;
338 u8 active;
339 u8 reseed;
340 u8 rate_np;
341 u8 rate_lp;
342 u8 rate_ulp;
343 u8 timeout_pwr;
344 u8 timeout_rdy;
345 u8 timeout_lta;
346 u8 misc_b;
347 u8 thresh_swipe;
348 u8 timeout_tap;
349 u8 timeout_swipe;
350 u8 redo_ati;
351 u8 padding;
352 struct iqs626_ch_reg_ulp ch_reg_ulp;
353 struct iqs626_tp_grp_reg tp_grp_reg;
354 struct iqs626_ch_reg_gen ch_reg_gen[IQS626_NUM_CH_GEN];
355 struct iqs626_ch_reg_hall ch_reg_hall;
356} __packed;
357
358struct iqs626_channel_desc {
359 const char *name;
360 int num_ch;
361 u8 active;
362 bool events[ARRAY_SIZE(iqs626_events)];
363};
364
365static const struct iqs626_channel_desc iqs626_channels[] = {
366 [IQS626_CH_ULP_0] = {
367 .name = "ulp-0",
368 .num_ch = 1,
369 .active = BIT(0),
370 .events = {
371 [IQS626_EVENT_PROX_DN] = true,
372 [IQS626_EVENT_PROX_UP] = true,
373 [IQS626_EVENT_TOUCH_DN] = true,
374 [IQS626_EVENT_TOUCH_UP] = true,
375 },
376 },
377 [IQS626_CH_TP_2] = {
378 .name = "trackpad-3x2",
379 .num_ch = IQS626_NUM_CH_TP_2,
380 .active = BIT(1),
381 .events = {
382 [IQS626_EVENT_TOUCH_DN] = true,
383 },
384 },
385 [IQS626_CH_TP_3] = {
386 .name = "trackpad-3x3",
387 .num_ch = IQS626_NUM_CH_TP_3,
388 .active = BIT(2) | BIT(1),
389 .events = {
390 [IQS626_EVENT_TOUCH_DN] = true,
391 },
392 },
393 [IQS626_CH_GEN_0] = {
394 .name = "generic-0",
395 .num_ch = 1,
396 .active = BIT(4),
397 .events = {
398 [IQS626_EVENT_PROX_DN] = true,
399 [IQS626_EVENT_PROX_UP] = true,
400 [IQS626_EVENT_TOUCH_DN] = true,
401 [IQS626_EVENT_TOUCH_UP] = true,
402 [IQS626_EVENT_DEEP_DN] = true,
403 [IQS626_EVENT_DEEP_UP] = true,
404 },
405 },
406 [IQS626_CH_GEN_1] = {
407 .name = "generic-1",
408 .num_ch = 1,
409 .active = BIT(5),
410 .events = {
411 [IQS626_EVENT_PROX_DN] = true,
412 [IQS626_EVENT_PROX_UP] = true,
413 [IQS626_EVENT_TOUCH_DN] = true,
414 [IQS626_EVENT_TOUCH_UP] = true,
415 [IQS626_EVENT_DEEP_DN] = true,
416 [IQS626_EVENT_DEEP_UP] = true,
417 },
418 },
419 [IQS626_CH_GEN_2] = {
420 .name = "generic-2",
421 .num_ch = 1,
422 .active = BIT(6),
423 .events = {
424 [IQS626_EVENT_PROX_DN] = true,
425 [IQS626_EVENT_PROX_UP] = true,
426 [IQS626_EVENT_TOUCH_DN] = true,
427 [IQS626_EVENT_TOUCH_UP] = true,
428 [IQS626_EVENT_DEEP_DN] = true,
429 [IQS626_EVENT_DEEP_UP] = true,
430 },
431 },
432 [IQS626_CH_HALL] = {
433 .name = "hall",
434 .num_ch = 1,
435 .active = BIT(7),
436 .events = {
437 [IQS626_EVENT_TOUCH_DN] = true,
438 [IQS626_EVENT_TOUCH_UP] = true,
439 },
440 },
441};
442
443struct iqs626_private {
444 struct i2c_client *client;
445 struct regmap *regmap;
446 struct iqs626_sys_reg sys_reg;
447 struct completion ati_done;
448 struct input_dev *keypad;
449 struct input_dev *trackpad;
450 struct touchscreen_properties prop;
451 unsigned int kp_type[ARRAY_SIZE(iqs626_channels)]
452 [ARRAY_SIZE(iqs626_events)];
453 unsigned int kp_code[ARRAY_SIZE(iqs626_channels)]
454 [ARRAY_SIZE(iqs626_events)];
455 unsigned int tp_code[IQS626_NUM_GESTURES];
456 unsigned int suspend_mode;
457};
458
459static noinline_for_stack int
460iqs626_parse_events(struct iqs626_private *iqs626,
461 const struct fwnode_handle *ch_node,
462 enum iqs626_ch_id ch_id)
463{
464 struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
465 struct i2c_client *client = iqs626->client;
466 const struct fwnode_handle *ev_node;
467 const char *ev_name;
468 u8 *thresh, *hyst;
469 unsigned int thresh_tp[IQS626_NUM_CH_TP_3];
470 unsigned int val;
471 int num_ch = iqs626_channels[ch_id].num_ch;
472 int error, i, j;
473
474 switch (ch_id) {
475 case IQS626_CH_ULP_0:
476 thresh = sys_reg->ch_reg_ulp.thresh;
477 hyst = &sys_reg->ch_reg_ulp.hyst;
478 break;
479
480 case IQS626_CH_TP_2:
481 case IQS626_CH_TP_3:
482 thresh = &sys_reg->tp_grp_reg.ch_reg_tp[0].thresh;
483 hyst = &sys_reg->tp_grp_reg.hyst;
484 break;
485
486 case IQS626_CH_GEN_0:
487 case IQS626_CH_GEN_1:
488 case IQS626_CH_GEN_2:
489 i = ch_id - IQS626_CH_GEN_0;
490 thresh = sys_reg->ch_reg_gen[i].thresh;
491 hyst = &sys_reg->ch_reg_gen[i].hyst;
492 break;
493
494 case IQS626_CH_HALL:
495 thresh = &sys_reg->ch_reg_hall.thresh;
496 hyst = &sys_reg->ch_reg_hall.hyst;
497 break;
498
499 default:
500 return -EINVAL;
501 }
502
503 for (i = 0; i < ARRAY_SIZE(iqs626_events); i++) {
504 if (!iqs626_channels[ch_id].events[i])
505 continue;
506
507 if (ch_id == IQS626_CH_TP_2 || ch_id == IQS626_CH_TP_3) {
508 /*
509 * Trackpad touch events are simply described under the
510 * trackpad child node.
511 */
512 ev_node = ch_node;
513 } else {
514 ev_name = iqs626_events[i].name;
515 ev_node = fwnode_get_named_child_node(ch_node, ev_name);
516 if (!ev_node)
517 continue;
518
519 if (!fwnode_property_read_u32(ev_node, "linux,code",
520 &val)) {
521 iqs626->kp_code[ch_id][i] = val;
522
523 if (fwnode_property_read_u32(ev_node,
524 "linux,input-type",
525 &val)) {
526 if (ch_id == IQS626_CH_HALL)
527 val = EV_SW;
528 else
529 val = EV_KEY;
530 }
531
532 if (val != EV_KEY && val != EV_SW) {
533 dev_err(&client->dev,
534 "Invalid input type: %u\n",
535 val);
536 return -EINVAL;
537 }
538
539 iqs626->kp_type[ch_id][i] = val;
540
541 sys_reg->event_mask &= ~iqs626_events[i].mask;
542 }
543 }
544
545 if (!fwnode_property_read_u32(ev_node, "azoteq,hyst", &val)) {
546 if (val > IQS626_CHx_HYST_MAX) {
547 dev_err(&client->dev,
548 "Invalid %s channel hysteresis: %u\n",
549 fwnode_get_name(ch_node), val);
550 return -EINVAL;
551 }
552
553 if (i == IQS626_EVENT_DEEP_DN ||
554 i == IQS626_EVENT_DEEP_UP) {
555 *hyst &= ~IQS626_CHx_HYST_DEEP_MASK;
556 *hyst |= (val << IQS626_CHx_HYST_DEEP_SHIFT);
557 } else if (i == IQS626_EVENT_TOUCH_DN ||
558 i == IQS626_EVENT_TOUCH_UP) {
559 *hyst &= ~IQS626_CHx_HYST_TOUCH_MASK;
560 *hyst |= val;
561 }
562 }
563
564 if (ch_id != IQS626_CH_TP_2 && ch_id != IQS626_CH_TP_3 &&
565 !fwnode_property_read_u32(ev_node, "azoteq,thresh", &val)) {
566 if (val > IQS626_CHx_THRESH_MAX) {
567 dev_err(&client->dev,
568 "Invalid %s channel threshold: %u\n",
569 fwnode_get_name(ch_node), val);
570 return -EINVAL;
571 }
572
573 if (ch_id == IQS626_CH_HALL)
574 *thresh = val;
575 else
576 *(thresh + iqs626_events[i].th_offs) = val;
577
578 continue;
579 }
580
581 if (!fwnode_property_present(ev_node, "azoteq,thresh"))
582 continue;
583
584 error = fwnode_property_read_u32_array(ev_node, "azoteq,thresh",
585 thresh_tp, num_ch);
586 if (error) {
587 dev_err(&client->dev,
588 "Failed to read %s channel thresholds: %d\n",
589 fwnode_get_name(ch_node), error);
590 return error;
591 }
592
593 for (j = 0; j < num_ch; j++) {
594 if (thresh_tp[j] > IQS626_CHx_THRESH_MAX) {
595 dev_err(&client->dev,
596 "Invalid %s channel threshold: %u\n",
597 fwnode_get_name(ch_node), thresh_tp[j]);
598 return -EINVAL;
599 }
600
601 sys_reg->tp_grp_reg.ch_reg_tp[j].thresh = thresh_tp[j];
602 }
603 }
604
605 return 0;
606}
607
608static noinline_for_stack int
609iqs626_parse_ati_target(struct iqs626_private *iqs626,
610 const struct fwnode_handle *ch_node,
611 enum iqs626_ch_id ch_id)
612{
613 struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
614 struct i2c_client *client = iqs626->client;
615 unsigned int ati_base[IQS626_NUM_CH_TP_3];
616 unsigned int val;
617 u8 *ati_target;
618 int num_ch = iqs626_channels[ch_id].num_ch;
619 int error, i;
620
621 switch (ch_id) {
622 case IQS626_CH_ULP_0:
623 ati_target = &sys_reg->ch_reg_ulp.ati_target;
624 break;
625
626 case IQS626_CH_TP_2:
627 case IQS626_CH_TP_3:
628 ati_target = &sys_reg->tp_grp_reg.ati_target;
629 break;
630
631 case IQS626_CH_GEN_0:
632 case IQS626_CH_GEN_1:
633 case IQS626_CH_GEN_2:
634 i = ch_id - IQS626_CH_GEN_0;
635 ati_target = &sys_reg->ch_reg_gen[i].ati_target;
636 break;
637
638 case IQS626_CH_HALL:
639 ati_target = &sys_reg->ch_reg_hall.ati_target;
640 break;
641
642 default:
643 return -EINVAL;
644 }
645
646 if (!fwnode_property_read_u32(ch_node, "azoteq,ati-target", &val)) {
647 if (val > IQS626_CHx_ATI_TARGET_MAX) {
648 dev_err(&client->dev,
649 "Invalid %s channel ATI target: %u\n",
650 fwnode_get_name(ch_node), val);
651 return -EINVAL;
652 }
653
654 *ati_target &= ~IQS626_CHx_ATI_TARGET_MASK;
655 *ati_target |= (val / 32);
656 }
657
658 if (ch_id != IQS626_CH_TP_2 && ch_id != IQS626_CH_TP_3 &&
659 !fwnode_property_read_u32(ch_node, "azoteq,ati-base", &val)) {
660 switch (val) {
661 case 75:
662 val = IQS626_CHx_ATI_BASE_75;
663 break;
664
665 case 100:
666 val = IQS626_CHx_ATI_BASE_100;
667 break;
668
669 case 150:
670 val = IQS626_CHx_ATI_BASE_150;
671 break;
672
673 case 200:
674 val = IQS626_CHx_ATI_BASE_200;
675 break;
676
677 default:
678 dev_err(&client->dev,
679 "Invalid %s channel ATI base: %u\n",
680 fwnode_get_name(ch_node), val);
681 return -EINVAL;
682 }
683
684 *ati_target &= ~IQS626_CHx_ATI_BASE_MASK;
685 *ati_target |= val;
686
687 return 0;
688 }
689
690 if (!fwnode_property_present(ch_node, "azoteq,ati-base"))
691 return 0;
692
693 error = fwnode_property_read_u32_array(ch_node, "azoteq,ati-base",
694 ati_base, num_ch);
695 if (error) {
696 dev_err(&client->dev,
697 "Failed to read %s channel ATI bases: %d\n",
698 fwnode_get_name(ch_node), error);
699 return error;
700 }
701
702 for (i = 0; i < num_ch; i++) {
703 if (ati_base[i] < IQS626_TPx_ATI_BASE_MIN ||
704 ati_base[i] > IQS626_TPx_ATI_BASE_MAX) {
705 dev_err(&client->dev,
706 "Invalid %s channel ATI base: %u\n",
707 fwnode_get_name(ch_node), ati_base[i]);
708 return -EINVAL;
709 }
710
711 ati_base[i] -= IQS626_TPx_ATI_BASE_MIN;
712 sys_reg->tp_grp_reg.ch_reg_tp[i].ati_base = ati_base[i];
713 }
714
715 return 0;
716}
717
718static int iqs626_parse_pins(struct iqs626_private *iqs626,
719 const struct fwnode_handle *ch_node,
720 const char *propname, u8 *enable)
721{
722 struct i2c_client *client = iqs626->client;
723 unsigned int val[IQS626_NUM_CRx_TX];
724 int error, count, i;
725
726 if (!fwnode_property_present(ch_node, propname))
727 return 0;
728
729 count = fwnode_property_count_u32(ch_node, propname);
730 if (count > IQS626_NUM_CRx_TX) {
731 dev_err(&client->dev,
732 "Too many %s channel CRX/TX pins present\n",
733 fwnode_get_name(ch_node));
734 return -EINVAL;
735 } else if (count < 0) {
736 dev_err(&client->dev,
737 "Failed to count %s channel CRX/TX pins: %d\n",
738 fwnode_get_name(ch_node), count);
739 return count;
740 }
741
742 error = fwnode_property_read_u32_array(ch_node, propname, val, count);
743 if (error) {
744 dev_err(&client->dev,
745 "Failed to read %s channel CRX/TX pins: %d\n",
746 fwnode_get_name(ch_node), error);
747 return error;
748 }
749
750 *enable = 0;
751
752 for (i = 0; i < count; i++) {
753 if (val[i] >= IQS626_NUM_CRx_TX) {
754 dev_err(&client->dev,
755 "Invalid %s channel CRX/TX pin: %u\n",
756 fwnode_get_name(ch_node), val[i]);
757 return -EINVAL;
758 }
759
760 *enable |= BIT(val[i]);
761 }
762
763 return 0;
764}
765
766static int iqs626_parse_trackpad(struct iqs626_private *iqs626,
767 const struct fwnode_handle *ch_node)
768{
769 struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
770 struct i2c_client *client = iqs626->client;
771 u8 *hyst = &sys_reg->tp_grp_reg.hyst;
772 unsigned int val;
773 int error, count;
774
775 if (!fwnode_property_read_u32(ch_node, "azoteq,lta-update", &val)) {
776 if (val > IQS626_MISC_A_TPx_LTA_UPDATE_MAX) {
777 dev_err(&client->dev,
778 "Invalid %s channel update rate: %u\n",
779 fwnode_get_name(ch_node), val);
780 return -EINVAL;
781 }
782
783 sys_reg->misc_a &= ~IQS626_MISC_A_TPx_LTA_UPDATE_MASK;
784 sys_reg->misc_a |= (val << IQS626_MISC_A_TPx_LTA_UPDATE_SHIFT);
785 }
786
787 if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-trackpad",
788 &val)) {
789 if (val > IQS626_FILT_STR_MAX) {
790 dev_err(&client->dev,
791 "Invalid %s channel filter strength: %u\n",
792 fwnode_get_name(ch_node), val);
793 return -EINVAL;
794 }
795
796 sys_reg->misc_b &= ~IQS626_MISC_B_FILT_STR_TPx;
797 sys_reg->misc_b |= val;
798 }
799
800 if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-np-cnt",
801 &val)) {
802 if (val > IQS626_FILT_STR_MAX) {
803 dev_err(&client->dev,
804 "Invalid %s channel filter strength: %u\n",
805 fwnode_get_name(ch_node), val);
806 return -EINVAL;
807 }
808
809 *hyst &= ~IQS626_FILT_STR_NP_TPx_MASK;
810 *hyst |= (val << IQS626_FILT_STR_NP_TPx_SHIFT);
811 }
812
813 if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-lp-cnt",
814 &val)) {
815 if (val > IQS626_FILT_STR_MAX) {
816 dev_err(&client->dev,
817 "Invalid %s channel filter strength: %u\n",
818 fwnode_get_name(ch_node), val);
819 return -EINVAL;
820 }
821
822 *hyst &= ~IQS626_FILT_STR_LP_TPx_MASK;
823 *hyst |= (val << IQS626_FILT_STR_LP_TPx_SHIFT);
824 }
825
826 if (!fwnode_property_present(ch_node, "linux,keycodes"))
827 return 0;
828
829 count = fwnode_property_count_u32(ch_node, "linux,keycodes");
830 if (count > IQS626_NUM_GESTURES) {
831 dev_err(&client->dev, "Too many keycodes present\n");
832 return -EINVAL;
833 } else if (count < 0) {
834 dev_err(&client->dev, "Failed to count keycodes: %d\n", count);
835 return count;
836 }
837
838 error = fwnode_property_read_u32_array(ch_node, "linux,keycodes",
839 iqs626->tp_code, count);
840 if (error) {
841 dev_err(&client->dev, "Failed to read keycodes: %d\n", error);
842 return error;
843 }
844
845 sys_reg->misc_b &= ~IQS626_MISC_B_TPx_SWIPE;
846 if (fwnode_property_present(ch_node, "azoteq,gesture-swipe"))
847 sys_reg->misc_b |= IQS626_MISC_B_TPx_SWIPE;
848
849 if (!fwnode_property_read_u32(ch_node, "azoteq,timeout-tap-ms",
850 &val)) {
851 if (val > IQS626_TIMEOUT_TAP_MS_MAX) {
852 dev_err(&client->dev,
853 "Invalid %s channel timeout: %u\n",
854 fwnode_get_name(ch_node), val);
855 return -EINVAL;
856 }
857
858 sys_reg->timeout_tap = val / 16;
859 }
860
861 if (!fwnode_property_read_u32(ch_node, "azoteq,timeout-swipe-ms",
862 &val)) {
863 if (val > IQS626_TIMEOUT_SWIPE_MS_MAX) {
864 dev_err(&client->dev,
865 "Invalid %s channel timeout: %u\n",
866 fwnode_get_name(ch_node), val);
867 return -EINVAL;
868 }
869
870 sys_reg->timeout_swipe = val / 16;
871 }
872
873 if (!fwnode_property_read_u32(ch_node, "azoteq,thresh-swipe",
874 &val)) {
875 if (val > IQS626_THRESH_SWIPE_MAX) {
876 dev_err(&client->dev,
877 "Invalid %s channel threshold: %u\n",
878 fwnode_get_name(ch_node), val);
879 return -EINVAL;
880 }
881
882 sys_reg->thresh_swipe = val;
883 }
884
885 sys_reg->event_mask &= ~IQS626_EVENT_MASK_GESTURE;
886
887 return 0;
888}
889
890static noinline_for_stack int
891iqs626_parse_channel(struct iqs626_private *iqs626,
892 const struct fwnode_handle *ch_node,
893 enum iqs626_ch_id ch_id)
894{
895 struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
896 struct i2c_client *client = iqs626->client;
897 u8 *engine, *filter, *rx_enable, *tx_enable;
898 u8 *assoc_select, *assoc_weight;
899 unsigned int val;
900 int error, i;
901
902 switch (ch_id) {
903 case IQS626_CH_ULP_0:
904 engine = sys_reg->ch_reg_ulp.engine;
905 break;
906
907 case IQS626_CH_TP_2:
908 case IQS626_CH_TP_3:
909 engine = sys_reg->tp_grp_reg.engine;
910 break;
911
912 case IQS626_CH_GEN_0:
913 case IQS626_CH_GEN_1:
914 case IQS626_CH_GEN_2:
915 i = ch_id - IQS626_CH_GEN_0;
916 engine = sys_reg->ch_reg_gen[i].engine;
917 break;
918
919 case IQS626_CH_HALL:
920 engine = &sys_reg->ch_reg_hall.engine;
921 break;
922
923 default:
924 return -EINVAL;
925 }
926
927 *engine |= IQS626_CHx_ENG_0_MEAS_CAP_SIZE;
928 if (fwnode_property_present(ch_node, "azoteq,meas-cap-decrease"))
929 *engine &= ~IQS626_CHx_ENG_0_MEAS_CAP_SIZE;
930
931 *engine |= IQS626_CHx_ENG_0_RX_TERM_VSS;
932 if (!fwnode_property_read_u32(ch_node, "azoteq,rx-inactive", &val)) {
933 switch (val) {
934 case IQS626_RX_INACTIVE_VSS:
935 break;
936
937 case IQS626_RX_INACTIVE_FLOAT:
938 *engine &= ~IQS626_CHx_ENG_0_RX_TERM_VSS;
939 if (ch_id == IQS626_CH_GEN_0 ||
940 ch_id == IQS626_CH_GEN_1 ||
941 ch_id == IQS626_CH_GEN_2)
942 *(engine + 4) &= ~IQS626_CHx_ENG_4_RX_TERM_VREG;
943 break;
944
945 case IQS626_RX_INACTIVE_VREG:
946 if (ch_id == IQS626_CH_GEN_0 ||
947 ch_id == IQS626_CH_GEN_1 ||
948 ch_id == IQS626_CH_GEN_2) {
949 *engine &= ~IQS626_CHx_ENG_0_RX_TERM_VSS;
950 *(engine + 4) |= IQS626_CHx_ENG_4_RX_TERM_VREG;
951 break;
952 }
953 fallthrough;
954
955 default:
956 dev_err(&client->dev,
957 "Invalid %s channel CRX pin termination: %u\n",
958 fwnode_get_name(ch_node), val);
959 return -EINVAL;
960 }
961 }
962
963 *engine &= ~IQS626_CHx_ENG_0_LINEARIZE;
964 if (fwnode_property_present(ch_node, "azoteq,linearize"))
965 *engine |= IQS626_CHx_ENG_0_LINEARIZE;
966
967 *engine &= ~IQS626_CHx_ENG_0_DUAL_DIR;
968 if (fwnode_property_present(ch_node, "azoteq,dual-direction"))
969 *engine |= IQS626_CHx_ENG_0_DUAL_DIR;
970
971 *engine &= ~IQS626_CHx_ENG_0_FILT_DISABLE;
972 if (fwnode_property_present(ch_node, "azoteq,filt-disable"))
973 *engine |= IQS626_CHx_ENG_0_FILT_DISABLE;
974
975 if (!fwnode_property_read_u32(ch_node, "azoteq,ati-mode", &val)) {
976 if (val > IQS626_CHx_ENG_0_ATI_MODE_MAX) {
977 dev_err(&client->dev,
978 "Invalid %s channel ATI mode: %u\n",
979 fwnode_get_name(ch_node), val);
980 return -EINVAL;
981 }
982
983 *engine &= ~IQS626_CHx_ENG_0_ATI_MODE_MASK;
984 *engine |= val;
985 }
986
987 if (ch_id == IQS626_CH_HALL)
988 return 0;
989
990 *(engine + 1) &= ~IQS626_CHx_ENG_1_CCT_ENABLE;
991 if (!fwnode_property_read_u32(ch_node, "azoteq,cct-increase",
992 &val) && val) {
993 unsigned int orig_val = val--;
994
995 /*
996 * In the case of the generic channels, the charge cycle time
997 * field doubles in size and straddles two separate registers.
998 */
999 if (ch_id == IQS626_CH_GEN_0 ||
1000 ch_id == IQS626_CH_GEN_1 ||
1001 ch_id == IQS626_CH_GEN_2) {
1002 *(engine + 4) &= ~IQS626_CHx_ENG_4_CCT_LOW_1;
1003 if (val & BIT(1))
1004 *(engine + 4) |= IQS626_CHx_ENG_4_CCT_LOW_1;
1005
1006 *(engine + 4) &= ~IQS626_CHx_ENG_4_CCT_LOW_0;
1007 if (val & BIT(0))
1008 *(engine + 4) |= IQS626_CHx_ENG_4_CCT_LOW_0;
1009
1010 val >>= 2;
1011 }
1012
1013 if (val & ~GENMASK(1, 0)) {
1014 dev_err(&client->dev,
1015 "Invalid %s channel charge cycle time: %u\n",
1016 fwnode_get_name(ch_node), orig_val);
1017 return -EINVAL;
1018 }
1019
1020 *(engine + 1) &= ~IQS626_CHx_ENG_1_CCT_HIGH_1;
1021 if (val & BIT(1))
1022 *(engine + 1) |= IQS626_CHx_ENG_1_CCT_HIGH_1;
1023
1024 *(engine + 1) &= ~IQS626_CHx_ENG_1_CCT_HIGH_0;
1025 if (val & BIT(0))
1026 *(engine + 1) |= IQS626_CHx_ENG_1_CCT_HIGH_0;
1027
1028 *(engine + 1) |= IQS626_CHx_ENG_1_CCT_ENABLE;
1029 }
1030
1031 if (!fwnode_property_read_u32(ch_node, "azoteq,proj-bias", &val)) {
1032 if (val > IQS626_CHx_ENG_1_PROJ_BIAS_MAX) {
1033 dev_err(&client->dev,
1034 "Invalid %s channel bias current: %u\n",
1035 fwnode_get_name(ch_node), val);
1036 return -EINVAL;
1037 }
1038
1039 *(engine + 1) &= ~IQS626_CHx_ENG_1_PROJ_BIAS_MASK;
1040 *(engine + 1) |= (val << IQS626_CHx_ENG_1_PROJ_BIAS_SHIFT);
1041 }
1042
1043 if (!fwnode_property_read_u32(ch_node, "azoteq,sense-freq", &val)) {
1044 if (val > IQS626_CHx_ENG_1_SENSE_FREQ_MAX) {
1045 dev_err(&client->dev,
1046 "Invalid %s channel sensing frequency: %u\n",
1047 fwnode_get_name(ch_node), val);
1048 return -EINVAL;
1049 }
1050
1051 *(engine + 1) &= ~IQS626_CHx_ENG_1_SENSE_FREQ_MASK;
1052 *(engine + 1) |= (val << IQS626_CHx_ENG_1_SENSE_FREQ_SHIFT);
1053 }
1054
1055 *(engine + 1) &= ~IQS626_CHx_ENG_1_ATI_BAND_TIGHTEN;
1056 if (fwnode_property_present(ch_node, "azoteq,ati-band-tighten"))
1057 *(engine + 1) |= IQS626_CHx_ENG_1_ATI_BAND_TIGHTEN;
1058
1059 if (ch_id == IQS626_CH_TP_2 || ch_id == IQS626_CH_TP_3)
1060 return iqs626_parse_trackpad(iqs626, ch_node);
1061
1062 if (ch_id == IQS626_CH_ULP_0) {
1063 sys_reg->ch_reg_ulp.hyst &= ~IQS626_ULP_PROJ_ENABLE;
1064 if (fwnode_property_present(ch_node, "azoteq,proj-enable"))
1065 sys_reg->ch_reg_ulp.hyst |= IQS626_ULP_PROJ_ENABLE;
1066
1067 filter = &sys_reg->ch_reg_ulp.filter;
1068
1069 rx_enable = &sys_reg->ch_reg_ulp.rx_enable;
1070 tx_enable = &sys_reg->ch_reg_ulp.tx_enable;
1071 } else {
1072 i = ch_id - IQS626_CH_GEN_0;
1073 filter = &sys_reg->ch_reg_gen[i].filter;
1074
1075 rx_enable = &sys_reg->ch_reg_gen[i].rx_enable;
1076 tx_enable = &sys_reg->ch_reg_gen[i].tx_enable;
1077 }
1078
1079 if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-np-cnt",
1080 &val)) {
1081 if (val > IQS626_FILT_STR_MAX) {
1082 dev_err(&client->dev,
1083 "Invalid %s channel filter strength: %u\n",
1084 fwnode_get_name(ch_node), val);
1085 return -EINVAL;
1086 }
1087
1088 *filter &= ~IQS626_FILT_STR_NP_CNT_MASK;
1089 *filter |= (val << IQS626_FILT_STR_NP_CNT_SHIFT);
1090 }
1091
1092 if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-lp-cnt",
1093 &val)) {
1094 if (val > IQS626_FILT_STR_MAX) {
1095 dev_err(&client->dev,
1096 "Invalid %s channel filter strength: %u\n",
1097 fwnode_get_name(ch_node), val);
1098 return -EINVAL;
1099 }
1100
1101 *filter &= ~IQS626_FILT_STR_LP_CNT_MASK;
1102 *filter |= (val << IQS626_FILT_STR_LP_CNT_SHIFT);
1103 }
1104
1105 if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-np-lta",
1106 &val)) {
1107 if (val > IQS626_FILT_STR_MAX) {
1108 dev_err(&client->dev,
1109 "Invalid %s channel filter strength: %u\n",
1110 fwnode_get_name(ch_node), val);
1111 return -EINVAL;
1112 }
1113
1114 *filter &= ~IQS626_FILT_STR_NP_LTA_MASK;
1115 *filter |= (val << IQS626_FILT_STR_NP_LTA_SHIFT);
1116 }
1117
1118 if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-lp-lta",
1119 &val)) {
1120 if (val > IQS626_FILT_STR_MAX) {
1121 dev_err(&client->dev,
1122 "Invalid %s channel filter strength: %u\n",
1123 fwnode_get_name(ch_node), val);
1124 return -EINVAL;
1125 }
1126
1127 *filter &= ~IQS626_FILT_STR_LP_LTA_MASK;
1128 *filter |= val;
1129 }
1130
1131 error = iqs626_parse_pins(iqs626, ch_node, "azoteq,rx-enable",
1132 rx_enable);
1133 if (error)
1134 return error;
1135
1136 error = iqs626_parse_pins(iqs626, ch_node, "azoteq,tx-enable",
1137 tx_enable);
1138 if (error)
1139 return error;
1140
1141 if (ch_id == IQS626_CH_ULP_0)
1142 return 0;
1143
1144 *(engine + 2) &= ~IQS626_CHx_ENG_2_LOCAL_CAP_ENABLE;
1145 if (!fwnode_property_read_u32(ch_node, "azoteq,local-cap-size",
1146 &val) && val) {
1147 unsigned int orig_val = val--;
1148
1149 if (val > IQS626_CHx_ENG_2_LOCAL_CAP_MAX) {
1150 dev_err(&client->dev,
1151 "Invalid %s channel local cap. size: %u\n",
1152 fwnode_get_name(ch_node), orig_val);
1153 return -EINVAL;
1154 }
1155
1156 *(engine + 2) &= ~IQS626_CHx_ENG_2_LOCAL_CAP_MASK;
1157 *(engine + 2) |= (val << IQS626_CHx_ENG_2_LOCAL_CAP_SHIFT);
1158
1159 *(engine + 2) |= IQS626_CHx_ENG_2_LOCAL_CAP_ENABLE;
1160 }
1161
1162 if (!fwnode_property_read_u32(ch_node, "azoteq,sense-mode", &val)) {
1163 if (val > IQS626_CHx_ENG_2_SENSE_MODE_MAX) {
1164 dev_err(&client->dev,
1165 "Invalid %s channel sensing mode: %u\n",
1166 fwnode_get_name(ch_node), val);
1167 return -EINVAL;
1168 }
1169
1170 *(engine + 2) &= ~IQS626_CHx_ENG_2_SENSE_MODE_MASK;
1171 *(engine + 2) |= val;
1172 }
1173
1174 if (!fwnode_property_read_u32(ch_node, "azoteq,tx-freq", &val)) {
1175 if (val > IQS626_CHx_ENG_3_TX_FREQ_MAX) {
1176 dev_err(&client->dev,
1177 "Invalid %s channel excitation frequency: %u\n",
1178 fwnode_get_name(ch_node), val);
1179 return -EINVAL;
1180 }
1181
1182 *(engine + 3) &= ~IQS626_CHx_ENG_3_TX_FREQ_MASK;
1183 *(engine + 3) |= (val << IQS626_CHx_ENG_3_TX_FREQ_SHIFT);
1184 }
1185
1186 *(engine + 3) &= ~IQS626_CHx_ENG_3_INV_LOGIC;
1187 if (fwnode_property_present(ch_node, "azoteq,invert-enable"))
1188 *(engine + 3) |= IQS626_CHx_ENG_3_INV_LOGIC;
1189
1190 *(engine + 4) &= ~IQS626_CHx_ENG_4_COMP_DISABLE;
1191 if (fwnode_property_present(ch_node, "azoteq,comp-disable"))
1192 *(engine + 4) |= IQS626_CHx_ENG_4_COMP_DISABLE;
1193
1194 *(engine + 4) &= ~IQS626_CHx_ENG_4_STATIC_ENABLE;
1195 if (fwnode_property_present(ch_node, "azoteq,static-enable"))
1196 *(engine + 4) |= IQS626_CHx_ENG_4_STATIC_ENABLE;
1197
1198 i = ch_id - IQS626_CH_GEN_0;
1199 assoc_select = &sys_reg->ch_reg_gen[i].assoc_select;
1200 assoc_weight = &sys_reg->ch_reg_gen[i].assoc_weight;
1201
1202 *assoc_select = 0;
1203 if (!fwnode_property_present(ch_node, "azoteq,assoc-select"))
1204 return 0;
1205
1206 for (i = 0; i < ARRAY_SIZE(iqs626_channels); i++) {
1207 if (fwnode_property_match_string(ch_node, "azoteq,assoc-select",
1208 iqs626_channels[i].name) < 0)
1209 continue;
1210
1211 *assoc_select |= iqs626_channels[i].active;
1212 }
1213
1214 if (fwnode_property_read_u32(ch_node, "azoteq,assoc-weight", &val))
1215 return 0;
1216
1217 if (val > IQS626_GEN_WEIGHT_MAX) {
1218 dev_err(&client->dev,
1219 "Invalid %s channel associated weight: %u\n",
1220 fwnode_get_name(ch_node), val);
1221 return -EINVAL;
1222 }
1223
1224 *assoc_weight = val;
1225
1226 return 0;
1227}
1228
1229static int iqs626_parse_prop(struct iqs626_private *iqs626)
1230{
1231 struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
1232 struct i2c_client *client = iqs626->client;
1233 struct fwnode_handle *ch_node;
1234 unsigned int val;
1235 int error, i;
1236 u16 general;
1237
1238 if (!device_property_read_u32(&client->dev, "azoteq,suspend-mode",
1239 &val)) {
1240 if (val > IQS626_SYS_SETTINGS_PWR_MODE_MAX) {
1241 dev_err(&client->dev, "Invalid suspend mode: %u\n",
1242 val);
1243 return -EINVAL;
1244 }
1245
1246 iqs626->suspend_mode = val;
1247 }
1248
1249 error = regmap_raw_read(iqs626->regmap, IQS626_SYS_SETTINGS, sys_reg,
1250 sizeof(*sys_reg));
1251 if (error)
1252 return error;
1253
1254 general = be16_to_cpu(sys_reg->general);
1255 general &= IQS626_SYS_SETTINGS_ULP_UPDATE_MASK;
1256
1257 if (device_property_present(&client->dev, "azoteq,clk-div"))
1258 general |= IQS626_SYS_SETTINGS_CLK_DIV;
1259
1260 if (device_property_present(&client->dev, "azoteq,ulp-enable"))
1261 general |= IQS626_SYS_SETTINGS_ULP_AUTO;
1262
1263 if (!device_property_read_u32(&client->dev, "azoteq,ulp-update",
1264 &val)) {
1265 if (val > IQS626_SYS_SETTINGS_ULP_UPDATE_MAX) {
1266 dev_err(&client->dev, "Invalid update rate: %u\n", val);
1267 return -EINVAL;
1268 }
1269
1270 general &= ~IQS626_SYS_SETTINGS_ULP_UPDATE_MASK;
1271 general |= (val << IQS626_SYS_SETTINGS_ULP_UPDATE_SHIFT);
1272 }
1273
1274 sys_reg->misc_a &= ~IQS626_MISC_A_ATI_BAND_DISABLE;
1275 if (device_property_present(&client->dev, "azoteq,ati-band-disable"))
1276 sys_reg->misc_a |= IQS626_MISC_A_ATI_BAND_DISABLE;
1277
1278 sys_reg->misc_a &= ~IQS626_MISC_A_ATI_LP_ONLY;
1279 if (device_property_present(&client->dev, "azoteq,ati-lp-only"))
1280 sys_reg->misc_a |= IQS626_MISC_A_ATI_LP_ONLY;
1281
1282 if (!device_property_read_u32(&client->dev, "azoteq,gpio3-select",
1283 &val)) {
1284 if (val > IQS626_MISC_A_GPIO3_SELECT_MAX) {
1285 dev_err(&client->dev, "Invalid GPIO3 selection: %u\n",
1286 val);
1287 return -EINVAL;
1288 }
1289
1290 sys_reg->misc_a &= ~IQS626_MISC_A_GPIO3_SELECT_MASK;
1291 sys_reg->misc_a |= val;
1292 }
1293
1294 if (!device_property_read_u32(&client->dev, "azoteq,reseed-select",
1295 &val)) {
1296 if (val > IQS626_MISC_B_RESEED_UI_SEL_MAX) {
1297 dev_err(&client->dev, "Invalid reseed selection: %u\n",
1298 val);
1299 return -EINVAL;
1300 }
1301
1302 sys_reg->misc_b &= ~IQS626_MISC_B_RESEED_UI_SEL_MASK;
1303 sys_reg->misc_b |= (val << IQS626_MISC_B_RESEED_UI_SEL_SHIFT);
1304 }
1305
1306 sys_reg->misc_b &= ~IQS626_MISC_B_THRESH_EXTEND;
1307 if (device_property_present(&client->dev, "azoteq,thresh-extend"))
1308 sys_reg->misc_b |= IQS626_MISC_B_THRESH_EXTEND;
1309
1310 sys_reg->misc_b &= ~IQS626_MISC_B_TRACKING_UI_ENABLE;
1311 if (device_property_present(&client->dev, "azoteq,tracking-enable"))
1312 sys_reg->misc_b |= IQS626_MISC_B_TRACKING_UI_ENABLE;
1313
1314 sys_reg->misc_b &= ~IQS626_MISC_B_RESEED_OFFSET;
1315 if (device_property_present(&client->dev, "azoteq,reseed-offset"))
1316 sys_reg->misc_b |= IQS626_MISC_B_RESEED_OFFSET;
1317
1318 if (!device_property_read_u32(&client->dev, "azoteq,rate-np-ms",
1319 &val)) {
1320 if (val > IQS626_RATE_NP_MS_MAX) {
1321 dev_err(&client->dev, "Invalid report rate: %u\n", val);
1322 return -EINVAL;
1323 }
1324
1325 sys_reg->rate_np = val;
1326 }
1327
1328 if (!device_property_read_u32(&client->dev, "azoteq,rate-lp-ms",
1329 &val)) {
1330 if (val > IQS626_RATE_LP_MS_MAX) {
1331 dev_err(&client->dev, "Invalid report rate: %u\n", val);
1332 return -EINVAL;
1333 }
1334
1335 sys_reg->rate_lp = val;
1336 }
1337
1338 if (!device_property_read_u32(&client->dev, "azoteq,rate-ulp-ms",
1339 &val)) {
1340 if (val > IQS626_RATE_ULP_MS_MAX) {
1341 dev_err(&client->dev, "Invalid report rate: %u\n", val);
1342 return -EINVAL;
1343 }
1344
1345 sys_reg->rate_ulp = val / 16;
1346 }
1347
1348 if (!device_property_read_u32(&client->dev, "azoteq,timeout-pwr-ms",
1349 &val)) {
1350 if (val > IQS626_TIMEOUT_PWR_MS_MAX) {
1351 dev_err(&client->dev, "Invalid timeout: %u\n", val);
1352 return -EINVAL;
1353 }
1354
1355 sys_reg->timeout_pwr = val / 512;
1356 }
1357
1358 if (!device_property_read_u32(&client->dev, "azoteq,timeout-lta-ms",
1359 &val)) {
1360 if (val > IQS626_TIMEOUT_LTA_MS_MAX) {
1361 dev_err(&client->dev, "Invalid timeout: %u\n", val);
1362 return -EINVAL;
1363 }
1364
1365 sys_reg->timeout_lta = val / 512;
1366 }
1367
1368 sys_reg->event_mask = ~((u8)IQS626_EVENT_MASK_SYS);
1369 sys_reg->redo_ati = 0;
1370
1371 sys_reg->reseed = 0;
1372 sys_reg->active = 0;
1373
1374 for (i = 0; i < ARRAY_SIZE(iqs626_channels); i++) {
1375 ch_node = device_get_named_child_node(&client->dev,
1376 iqs626_channels[i].name);
1377 if (!ch_node)
1378 continue;
1379
1380 error = iqs626_parse_channel(iqs626, ch_node, i);
1381 if (error)
1382 return error;
1383
1384 error = iqs626_parse_ati_target(iqs626, ch_node, i);
1385 if (error)
1386 return error;
1387
1388 error = iqs626_parse_events(iqs626, ch_node, i);
1389 if (error)
1390 return error;
1391
1392 if (!fwnode_property_present(ch_node, "azoteq,ati-exclude"))
1393 sys_reg->redo_ati |= iqs626_channels[i].active;
1394
1395 if (!fwnode_property_present(ch_node, "azoteq,reseed-disable"))
1396 sys_reg->reseed |= iqs626_channels[i].active;
1397
1398 sys_reg->active |= iqs626_channels[i].active;
1399 }
1400
1401 general |= IQS626_SYS_SETTINGS_EVENT_MODE;
1402
1403 /*
1404 * Enable streaming during normal-power mode if the trackpad is used to
1405 * report raw coordinates instead of gestures. In that case, the device
1406 * returns to event mode during low-power mode.
1407 */
1408 if (sys_reg->active & iqs626_channels[IQS626_CH_TP_2].active &&
1409 sys_reg->event_mask & IQS626_EVENT_MASK_GESTURE)
1410 general |= IQS626_SYS_SETTINGS_EVENT_MODE_LP;
1411
1412 general |= IQS626_SYS_SETTINGS_REDO_ATI;
1413 general |= IQS626_SYS_SETTINGS_ACK_RESET;
1414
1415 sys_reg->general = cpu_to_be16(general);
1416
1417 error = regmap_raw_write(iqs626->regmap, IQS626_SYS_SETTINGS,
1418 &iqs626->sys_reg, sizeof(iqs626->sys_reg));
1419 if (error)
1420 return error;
1421
1422 iqs626_irq_wait();
1423
1424 return 0;
1425}
1426
1427static int iqs626_input_init(struct iqs626_private *iqs626)
1428{
1429 struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
1430 struct i2c_client *client = iqs626->client;
1431 int error, i, j;
1432
1433 iqs626->keypad = devm_input_allocate_device(&client->dev);
1434 if (!iqs626->keypad)
1435 return -ENOMEM;
1436
1437 iqs626->keypad->keycodemax = ARRAY_SIZE(iqs626->kp_code);
1438 iqs626->keypad->keycode = iqs626->kp_code;
1439 iqs626->keypad->keycodesize = sizeof(**iqs626->kp_code);
1440
1441 iqs626->keypad->name = "iqs626a_keypad";
1442 iqs626->keypad->id.bustype = BUS_I2C;
1443
1444 for (i = 0; i < ARRAY_SIZE(iqs626_channels); i++) {
1445 if (!(sys_reg->active & iqs626_channels[i].active))
1446 continue;
1447
1448 for (j = 0; j < ARRAY_SIZE(iqs626_events); j++) {
1449 if (!iqs626->kp_type[i][j])
1450 continue;
1451
1452 input_set_capability(iqs626->keypad,
1453 iqs626->kp_type[i][j],
1454 iqs626->kp_code[i][j]);
1455 }
1456 }
1457
1458 if (!(sys_reg->active & iqs626_channels[IQS626_CH_TP_2].active))
1459 return 0;
1460
1461 iqs626->trackpad = devm_input_allocate_device(&client->dev);
1462 if (!iqs626->trackpad)
1463 return -ENOMEM;
1464
1465 iqs626->trackpad->keycodemax = ARRAY_SIZE(iqs626->tp_code);
1466 iqs626->trackpad->keycode = iqs626->tp_code;
1467 iqs626->trackpad->keycodesize = sizeof(*iqs626->tp_code);
1468
1469 iqs626->trackpad->name = "iqs626a_trackpad";
1470 iqs626->trackpad->id.bustype = BUS_I2C;
1471
1472 /*
1473 * Present the trackpad as a traditional pointing device if no gestures
1474 * have been mapped to a keycode.
1475 */
1476 if (sys_reg->event_mask & IQS626_EVENT_MASK_GESTURE) {
1477 u8 tp_mask = iqs626_channels[IQS626_CH_TP_3].active;
1478
1479 input_set_capability(iqs626->trackpad, EV_KEY, BTN_TOUCH);
1480 input_set_abs_params(iqs626->trackpad, ABS_Y, 0, 255, 0, 0);
1481
1482 if ((sys_reg->active & tp_mask) == tp_mask)
1483 input_set_abs_params(iqs626->trackpad,
1484 ABS_X, 0, 255, 0, 0);
1485 else
1486 input_set_abs_params(iqs626->trackpad,
1487 ABS_X, 0, 128, 0, 0);
1488
1489 touchscreen_parse_properties(iqs626->trackpad, false,
1490 &iqs626->prop);
1491 } else {
1492 for (i = 0; i < IQS626_NUM_GESTURES; i++)
1493 if (iqs626->tp_code[i] != KEY_RESERVED)
1494 input_set_capability(iqs626->trackpad, EV_KEY,
1495 iqs626->tp_code[i]);
1496 }
1497
1498 error = input_register_device(iqs626->trackpad);
1499 if (error)
1500 dev_err(&client->dev, "Failed to register trackpad: %d\n",
1501 error);
1502
1503 return error;
1504}
1505
1506static int iqs626_report(struct iqs626_private *iqs626)
1507{
1508 struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
1509 struct i2c_client *client = iqs626->client;
1510 struct iqs626_flags flags;
1511 __le16 hall_output;
1512 int error, i, j;
1513 u8 state;
1514 u8 *dir_mask = &flags.states[IQS626_ST_OFFS_DIR];
1515
1516 error = regmap_raw_read(iqs626->regmap, IQS626_SYS_FLAGS, &flags,
1517 sizeof(flags));
1518 if (error) {
1519 dev_err(&client->dev, "Failed to read device status: %d\n",
1520 error);
1521 return error;
1522 }
1523
1524 /*
1525 * The device resets itself if its own watchdog bites, which can happen
1526 * in the event of an I2C communication error. In this case, the device
1527 * asserts a SHOW_RESET interrupt and all registers must be restored.
1528 */
1529 if (be16_to_cpu(flags.system) & IQS626_SYS_FLAGS_SHOW_RESET) {
1530 dev_err(&client->dev, "Unexpected device reset\n");
1531
1532 error = regmap_raw_write(iqs626->regmap, IQS626_SYS_SETTINGS,
1533 sys_reg, sizeof(*sys_reg));
1534 if (error)
1535 dev_err(&client->dev,
1536 "Failed to re-initialize device: %d\n", error);
1537
1538 return error;
1539 }
1540
1541 if (be16_to_cpu(flags.system) & IQS626_SYS_FLAGS_IN_ATI)
1542 return 0;
1543
1544 /*
1545 * Unlike the ULP or generic channels, the Hall channel does not have a
1546 * direction flag. Instead, the direction (i.e. magnet polarity) can be
1547 * derived based on the sign of the 2's complement differential output.
1548 */
1549 if (sys_reg->active & iqs626_channels[IQS626_CH_HALL].active) {
1550 error = regmap_raw_read(iqs626->regmap, IQS626_HALL_OUTPUT,
1551 &hall_output, sizeof(hall_output));
1552 if (error) {
1553 dev_err(&client->dev,
1554 "Failed to read Hall output: %d\n", error);
1555 return error;
1556 }
1557
1558 *dir_mask &= ~iqs626_channels[IQS626_CH_HALL].active;
1559 if (le16_to_cpu(hall_output) < 0x8000)
1560 *dir_mask |= iqs626_channels[IQS626_CH_HALL].active;
1561 }
1562
1563 for (i = 0; i < ARRAY_SIZE(iqs626_channels); i++) {
1564 if (!(sys_reg->active & iqs626_channels[i].active))
1565 continue;
1566
1567 for (j = 0; j < ARRAY_SIZE(iqs626_events); j++) {
1568 if (!iqs626->kp_type[i][j])
1569 continue;
1570
1571 state = flags.states[iqs626_events[j].st_offs];
1572 state &= iqs626_events[j].dir_up ? *dir_mask
1573 : ~(*dir_mask);
1574 state &= iqs626_channels[i].active;
1575
1576 input_event(iqs626->keypad, iqs626->kp_type[i][j],
1577 iqs626->kp_code[i][j], !!state);
1578 }
1579 }
1580
1581 input_sync(iqs626->keypad);
1582
1583 /*
1584 * The following completion signals that ATI has finished, any initial
1585 * switch states have been reported and the keypad can be registered.
1586 */
1587 complete_all(&iqs626->ati_done);
1588
1589 if (!(sys_reg->active & iqs626_channels[IQS626_CH_TP_2].active))
1590 return 0;
1591
1592 if (sys_reg->event_mask & IQS626_EVENT_MASK_GESTURE) {
1593 state = flags.states[IQS626_ST_OFFS_TOUCH];
1594 state &= iqs626_channels[IQS626_CH_TP_2].active;
1595
1596 input_report_key(iqs626->trackpad, BTN_TOUCH, state);
1597
1598 if (state)
1599 touchscreen_report_pos(iqs626->trackpad, &iqs626->prop,
1600 flags.trackpad_x,
1601 flags.trackpad_y, false);
1602 } else {
1603 for (i = 0; i < IQS626_NUM_GESTURES; i++)
1604 input_report_key(iqs626->trackpad, iqs626->tp_code[i],
1605 flags.gesture & BIT(i));
1606
1607 if (flags.gesture & GENMASK(IQS626_GESTURE_TAP, 0)) {
1608 input_sync(iqs626->trackpad);
1609
1610 /*
1611 * Momentary gestures are followed by a complementary
1612 * release cycle so as to emulate a full keystroke.
1613 */
1614 for (i = 0; i < IQS626_GESTURE_HOLD; i++)
1615 input_report_key(iqs626->trackpad,
1616 iqs626->tp_code[i], 0);
1617 }
1618 }
1619
1620 input_sync(iqs626->trackpad);
1621
1622 return 0;
1623}
1624
1625static irqreturn_t iqs626_irq(int irq, void *context)
1626{
1627 struct iqs626_private *iqs626 = context;
1628
1629 if (iqs626_report(iqs626))
1630 return IRQ_NONE;
1631
1632 /*
1633 * The device does not deassert its interrupt (RDY) pin until shortly
1634 * after receiving an I2C stop condition; the following delay ensures
1635 * the interrupt handler does not return before this time.
1636 */
1637 iqs626_irq_wait();
1638
1639 return IRQ_HANDLED;
1640}
1641
1642static const struct regmap_config iqs626_regmap_config = {
1643 .reg_bits = 8,
1644 .val_bits = 16,
1645 .max_register = IQS626_MAX_REG,
1646};
1647
1648static int iqs626_probe(struct i2c_client *client)
1649{
1650 struct iqs626_ver_info ver_info;
1651 struct iqs626_private *iqs626;
1652 int error;
1653
1654 iqs626 = devm_kzalloc(&client->dev, sizeof(*iqs626), GFP_KERNEL);
1655 if (!iqs626)
1656 return -ENOMEM;
1657
1658 i2c_set_clientdata(client, iqs626);
1659 iqs626->client = client;
1660
1661 iqs626->regmap = devm_regmap_init_i2c(client, &iqs626_regmap_config);
1662 if (IS_ERR(iqs626->regmap)) {
1663 error = PTR_ERR(iqs626->regmap);
1664 dev_err(&client->dev, "Failed to initialize register map: %d\n",
1665 error);
1666 return error;
1667 }
1668
1669 init_completion(&iqs626->ati_done);
1670
1671 error = regmap_raw_read(iqs626->regmap, IQS626_VER_INFO, &ver_info,
1672 sizeof(ver_info));
1673 if (error)
1674 return error;
1675
1676 if (ver_info.prod_num != IQS626_VER_INFO_PROD_NUM) {
1677 dev_err(&client->dev, "Unrecognized product number: 0x%02X\n",
1678 ver_info.prod_num);
1679 return -EINVAL;
1680 }
1681
1682 error = iqs626_parse_prop(iqs626);
1683 if (error)
1684 return error;
1685
1686 error = iqs626_input_init(iqs626);
1687 if (error)
1688 return error;
1689
1690 error = devm_request_threaded_irq(&client->dev, client->irq,
1691 NULL, iqs626_irq, IRQF_ONESHOT,
1692 client->name, iqs626);
1693 if (error) {
1694 dev_err(&client->dev, "Failed to request IRQ: %d\n", error);
1695 return error;
1696 }
1697
1698 if (!wait_for_completion_timeout(&iqs626->ati_done,
1699 msecs_to_jiffies(2000))) {
1700 dev_err(&client->dev, "Failed to complete ATI\n");
1701 return -ETIMEDOUT;
1702 }
1703
1704 /*
1705 * The keypad may include one or more switches and is not registered
1706 * until ATI is complete and the initial switch states are read.
1707 */
1708 error = input_register_device(iqs626->keypad);
1709 if (error)
1710 dev_err(&client->dev, "Failed to register keypad: %d\n", error);
1711
1712 return error;
1713}
1714
1715static int __maybe_unused iqs626_suspend(struct device *dev)
1716{
1717 struct iqs626_private *iqs626 = dev_get_drvdata(dev);
1718 struct i2c_client *client = iqs626->client;
1719 unsigned int val;
1720 int error;
1721
1722 if (!iqs626->suspend_mode)
1723 return 0;
1724
1725 disable_irq(client->irq);
1726
1727 /*
1728 * Automatic power mode switching must be disabled before the device is
1729 * forced into any particular power mode. In this case, the device will
1730 * transition into normal-power mode.
1731 */
1732 error = regmap_update_bits(iqs626->regmap, IQS626_SYS_SETTINGS,
1733 IQS626_SYS_SETTINGS_DIS_AUTO, ~0);
1734 if (error)
1735 goto err_irq;
1736
1737 /*
1738 * The following check ensures the device has completed its transition
1739 * into normal-power mode before a manual mode switch is performed.
1740 */
1741 error = regmap_read_poll_timeout(iqs626->regmap, IQS626_SYS_FLAGS, val,
1742 !(val & IQS626_SYS_FLAGS_PWR_MODE_MASK),
1743 IQS626_PWR_MODE_POLL_SLEEP_US,
1744 IQS626_PWR_MODE_POLL_TIMEOUT_US);
1745 if (error)
1746 goto err_irq;
1747
1748 error = regmap_update_bits(iqs626->regmap, IQS626_SYS_SETTINGS,
1749 IQS626_SYS_SETTINGS_PWR_MODE_MASK,
1750 iqs626->suspend_mode <<
1751 IQS626_SYS_SETTINGS_PWR_MODE_SHIFT);
1752 if (error)
1753 goto err_irq;
1754
1755 /*
1756 * This last check ensures the device has completed its transition into
1757 * the desired power mode to prevent any spurious interrupts from being
1758 * triggered after iqs626_suspend has already returned.
1759 */
1760 error = regmap_read_poll_timeout(iqs626->regmap, IQS626_SYS_FLAGS, val,
1761 (val & IQS626_SYS_FLAGS_PWR_MODE_MASK)
1762 == (iqs626->suspend_mode <<
1763 IQS626_SYS_FLAGS_PWR_MODE_SHIFT),
1764 IQS626_PWR_MODE_POLL_SLEEP_US,
1765 IQS626_PWR_MODE_POLL_TIMEOUT_US);
1766
1767err_irq:
1768 iqs626_irq_wait();
1769 enable_irq(client->irq);
1770
1771 return error;
1772}
1773
1774static int __maybe_unused iqs626_resume(struct device *dev)
1775{
1776 struct iqs626_private *iqs626 = dev_get_drvdata(dev);
1777 struct i2c_client *client = iqs626->client;
1778 unsigned int val;
1779 int error;
1780
1781 if (!iqs626->suspend_mode)
1782 return 0;
1783
1784 disable_irq(client->irq);
1785
1786 error = regmap_update_bits(iqs626->regmap, IQS626_SYS_SETTINGS,
1787 IQS626_SYS_SETTINGS_PWR_MODE_MASK, 0);
1788 if (error)
1789 goto err_irq;
1790
1791 /*
1792 * This check ensures the device has returned to normal-power mode
1793 * before automatic power mode switching is re-enabled.
1794 */
1795 error = regmap_read_poll_timeout(iqs626->regmap, IQS626_SYS_FLAGS, val,
1796 !(val & IQS626_SYS_FLAGS_PWR_MODE_MASK),
1797 IQS626_PWR_MODE_POLL_SLEEP_US,
1798 IQS626_PWR_MODE_POLL_TIMEOUT_US);
1799 if (error)
1800 goto err_irq;
1801
1802 error = regmap_update_bits(iqs626->regmap, IQS626_SYS_SETTINGS,
1803 IQS626_SYS_SETTINGS_DIS_AUTO, 0);
1804 if (error)
1805 goto err_irq;
1806
1807 /*
1808 * This step reports any events that may have been "swallowed" as a
1809 * result of polling PWR_MODE (which automatically acknowledges any
1810 * pending interrupts).
1811 */
1812 error = iqs626_report(iqs626);
1813
1814err_irq:
1815 iqs626_irq_wait();
1816 enable_irq(client->irq);
1817
1818 return error;
1819}
1820
1821static SIMPLE_DEV_PM_OPS(iqs626_pm, iqs626_suspend, iqs626_resume);
1822
1823static const struct of_device_id iqs626_of_match[] = {
1824 { .compatible = "azoteq,iqs626a" },
1825 { }
1826};
1827MODULE_DEVICE_TABLE(of, iqs626_of_match);
1828
1829static struct i2c_driver iqs626_i2c_driver = {
1830 .driver = {
1831 .name = "iqs626a",
1832 .of_match_table = iqs626_of_match,
1833 .pm = &iqs626_pm,
1834 },
1835 .probe_new = iqs626_probe,
1836};
1837module_i2c_driver(iqs626_i2c_driver);
1838
1839MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
1840MODULE_DESCRIPTION("Azoteq IQS626A Capacitive Touch Controller");
1841MODULE_LICENSE("GPL");