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Linux 5.1.15
[linux/fpc-iii.git] / drivers / input / keyboard / pxa27x_keypad.c
blobd0bdaeadf86d8ab0af2468ff07b94541845700f9
1 /*
2 * linux/drivers/input/keyboard/pxa27x_keypad.c
3 *
4 * Driver for the pxa27x matrix keyboard controller.
5 *
6 * Created: Feb 22, 2007
7 * Author: Rodolfo Giometti <giometti@linux.it>
8 *
9 * Based on a previous implementations by Kevin O'Connor
10 * <kevin_at_koconnor.net> and Alex Osborne <bobofdoom@gmail.com> and
11 * on some suggestions by Nicolas Pitre <nico@fluxnic.net>.
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
18
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/interrupt.h>
22 #include <linux/input.h>
23 #include <linux/io.h>
24 #include <linux/device.h>
25 #include <linux/platform_device.h>
26 #include <linux/clk.h>
27 #include <linux/err.h>
28 #include <linux/input/matrix_keypad.h>
29 #include <linux/slab.h>
30 #include <linux/of.h>
31
32 #include <linux/platform_data/keypad-pxa27x.h>
33 /*
34 * Keypad Controller registers
35 */
36 #define KPC 0x0000 /* Keypad Control register */
37 #define KPDK 0x0008 /* Keypad Direct Key register */
38 #define KPREC 0x0010 /* Keypad Rotary Encoder register */
39 #define KPMK 0x0018 /* Keypad Matrix Key register */
40 #define KPAS 0x0020 /* Keypad Automatic Scan register */
41
42 /* Keypad Automatic Scan Multiple Key Presser register 0-3 */
43 #define KPASMKP0 0x0028
44 #define KPASMKP1 0x0030
45 #define KPASMKP2 0x0038
46 #define KPASMKP3 0x0040
47 #define KPKDI 0x0048
48
49 /* bit definitions */
50 #define KPC_MKRN(n) ((((n) - 1) & 0x7) << 26) /* matrix key row number */
51 #define KPC_MKCN(n) ((((n) - 1) & 0x7) << 23) /* matrix key column number */
52 #define KPC_DKN(n) ((((n) - 1) & 0x7) << 6) /* direct key number */
53
54 #define KPC_AS (0x1 << 30) /* Automatic Scan bit */
55 #define KPC_ASACT (0x1 << 29) /* Automatic Scan on Activity */
56 #define KPC_MI (0x1 << 22) /* Matrix interrupt bit */
57 #define KPC_IMKP (0x1 << 21) /* Ignore Multiple Key Press */
58
59 #define KPC_MS(n) (0x1 << (13 + (n))) /* Matrix scan line 'n' */
60 #define KPC_MS_ALL (0xff << 13)
61
62 #define KPC_ME (0x1 << 12) /* Matrix Keypad Enable */
63 #define KPC_MIE (0x1 << 11) /* Matrix Interrupt Enable */
64 #define KPC_DK_DEB_SEL (0x1 << 9) /* Direct Keypad Debounce Select */
65 #define KPC_DI (0x1 << 5) /* Direct key interrupt bit */
66 #define KPC_RE_ZERO_DEB (0x1 << 4) /* Rotary Encoder Zero Debounce */
67 #define KPC_REE1 (0x1 << 3) /* Rotary Encoder1 Enable */
68 #define KPC_REE0 (0x1 << 2) /* Rotary Encoder0 Enable */
69 #define KPC_DE (0x1 << 1) /* Direct Keypad Enable */
70 #define KPC_DIE (0x1 << 0) /* Direct Keypad interrupt Enable */
71
72 #define KPDK_DKP (0x1 << 31)
73 #define KPDK_DK(n) ((n) & 0xff)
74
75 #define KPREC_OF1 (0x1 << 31)
76 #define kPREC_UF1 (0x1 << 30)
77 #define KPREC_OF0 (0x1 << 15)
78 #define KPREC_UF0 (0x1 << 14)
79
80 #define KPREC_RECOUNT0(n) ((n) & 0xff)
81 #define KPREC_RECOUNT1(n) (((n) >> 16) & 0xff)
82
83 #define KPMK_MKP (0x1 << 31)
84 #define KPAS_SO (0x1 << 31)
85 #define KPASMKPx_SO (0x1 << 31)
86
87 #define KPAS_MUKP(n) (((n) >> 26) & 0x1f)
88 #define KPAS_RP(n) (((n) >> 4) & 0xf)
89 #define KPAS_CP(n) ((n) & 0xf)
90
91 #define KPASMKP_MKC_MASK (0xff)
92
93 #define keypad_readl(off) __raw_readl(keypad->mmio_base + (off))
94 #define keypad_writel(off, v) __raw_writel((v), keypad->mmio_base + (off))
95
96 #define MAX_MATRIX_KEY_NUM (MAX_MATRIX_KEY_ROWS * MAX_MATRIX_KEY_COLS)
97 #define MAX_KEYPAD_KEYS (MAX_MATRIX_KEY_NUM + MAX_DIRECT_KEY_NUM)
98
99 struct pxa27x_keypad {
100 const struct pxa27x_keypad_platform_data *pdata;
101
102 struct clk *clk;
103 struct input_dev *input_dev;
104 void __iomem *mmio_base;
105
106 int irq;
107
108 unsigned short keycodes[MAX_KEYPAD_KEYS];
109 int rotary_rel_code[2];
110
111 unsigned int row_shift;
112
113 /* state row bits of each column scan */
114 uint32_t matrix_key_state[MAX_MATRIX_KEY_COLS];
115 uint32_t direct_key_state;
116
117 unsigned int direct_key_mask;
118 };
119
120 #ifdef CONFIG_OF
121 static int pxa27x_keypad_matrix_key_parse_dt(struct pxa27x_keypad *keypad,
122 struct pxa27x_keypad_platform_data *pdata)
123 {
124 struct input_dev *input_dev = keypad->input_dev;
125 struct device *dev = input_dev->dev.parent;
126 u32 rows, cols;
127 int error;
128
129 error = matrix_keypad_parse_properties(dev, &rows, &cols);
130 if (error)
131 return error;
132
133 if (rows > MAX_MATRIX_KEY_ROWS || cols > MAX_MATRIX_KEY_COLS) {
134 dev_err(dev, "rows or cols exceeds maximum value\n");
135 return -EINVAL;
136 }
137
138 pdata->matrix_key_rows = rows;
139 pdata->matrix_key_cols = cols;
140
141 error = matrix_keypad_build_keymap(NULL, NULL,
142 pdata->matrix_key_rows,
143 pdata->matrix_key_cols,
144 keypad->keycodes, input_dev);
145 if (error)
146 return error;
147
148 return 0;
149 }
150
151 static int pxa27x_keypad_direct_key_parse_dt(struct pxa27x_keypad *keypad,
152 struct pxa27x_keypad_platform_data *pdata)
153 {
154 struct input_dev *input_dev = keypad->input_dev;
155 struct device *dev = input_dev->dev.parent;
156 struct device_node *np = dev->of_node;
157 const __be16 *prop;
158 unsigned short code;
159 unsigned int proplen, size;
160 int i;
161 int error;
162
163 error = of_property_read_u32(np, "marvell,direct-key-count",
164 &pdata->direct_key_num);
165 if (error) {
166 /*
167 * If do not have marvel,direct-key-count defined,
168 * it means direct key is not supported.
169 */
170 return error == -EINVAL ? 0 : error;
171 }
172
173 error = of_property_read_u32(np, "marvell,direct-key-mask",
174 &pdata->direct_key_mask);
175 if (error) {
176 if (error != -EINVAL)
177 return error;
178
179 /*
180 * If marvell,direct-key-mask is not defined, driver will use
181 * default value. Default value is set when configure the keypad.
182 */
183 pdata->direct_key_mask = 0;
184 }
185
186 pdata->direct_key_low_active = of_property_read_bool(np,
187 "marvell,direct-key-low-active");
188
189 prop = of_get_property(np, "marvell,direct-key-map", &proplen);
190 if (!prop)
191 return -EINVAL;
192
193 if (proplen % sizeof(u16))
194 return -EINVAL;
195
196 size = proplen / sizeof(u16);
197
198 /* Only MAX_DIRECT_KEY_NUM is accepted.*/
199 if (size > MAX_DIRECT_KEY_NUM)
200 return -EINVAL;
201
202 for (i = 0; i < size; i++) {
203 code = be16_to_cpup(prop + i);
204 keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = code;
205 __set_bit(code, input_dev->keybit);
206 }
207
208 return 0;
209 }
210
211 static int pxa27x_keypad_rotary_parse_dt(struct pxa27x_keypad *keypad,
212 struct pxa27x_keypad_platform_data *pdata)
213 {
214 const __be32 *prop;
215 int i, relkey_ret;
216 unsigned int code, proplen;
217 const char *rotaryname[2] = {
218 "marvell,rotary0", "marvell,rotary1"};
219 const char relkeyname[] = {"marvell,rotary-rel-key"};
220 struct input_dev *input_dev = keypad->input_dev;
221 struct device *dev = input_dev->dev.parent;
222 struct device_node *np = dev->of_node;
223
224 relkey_ret = of_property_read_u32(np, relkeyname, &code);
225 /* if can read correct rotary key-code, we do not need this. */
226 if (relkey_ret == 0) {
227 unsigned short relcode;
228
229 /* rotary0 taks lower half, rotary1 taks upper half. */
230 relcode = code & 0xffff;
231 pdata->rotary0_rel_code = (code & 0xffff);
232 __set_bit(relcode, input_dev->relbit);
233
234 relcode = code >> 16;
235 pdata->rotary1_rel_code = relcode;
236 __set_bit(relcode, input_dev->relbit);
237 }
238
239 for (i = 0; i < 2; i++) {
240 prop = of_get_property(np, rotaryname[i], &proplen);
241 /*
242 * If the prop is not set, it means keypad does not need
243 * initialize the rotaryX.
244 */
245 if (!prop)
246 continue;
247
248 code = be32_to_cpup(prop);
249 /*
250 * Not all up/down key code are valid.
251 * Now we depends on direct-rel-code.
252 */
253 if ((!(code & 0xffff) || !(code >> 16)) && relkey_ret) {
254 return relkey_ret;
255 } else {
256 unsigned int n = MAX_MATRIX_KEY_NUM + (i << 1);
257 unsigned short keycode;
258
259 keycode = code & 0xffff;
260 keypad->keycodes[n] = keycode;
261 __set_bit(keycode, input_dev->keybit);
262
263 keycode = code >> 16;
264 keypad->keycodes[n + 1] = keycode;
265 __set_bit(keycode, input_dev->keybit);
266
267 if (i == 0)
268 pdata->rotary0_rel_code = -1;
269 else
270 pdata->rotary1_rel_code = -1;
271 }
272 if (i == 0)
273 pdata->enable_rotary0 = 1;
274 else
275 pdata->enable_rotary1 = 1;
276 }
277
278 keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
279 keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
280
281 return 0;
282 }
283
284 static int pxa27x_keypad_build_keycode_from_dt(struct pxa27x_keypad *keypad)
285 {
286 struct input_dev *input_dev = keypad->input_dev;
287 struct device *dev = input_dev->dev.parent;
288 struct device_node *np = dev->of_node;
289 struct pxa27x_keypad_platform_data *pdata;
290 int error;
291
292 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
293 if (!pdata) {
294 dev_err(dev, "failed to allocate memory for pdata\n");
295 return -ENOMEM;
296 }
297
298 error = pxa27x_keypad_matrix_key_parse_dt(keypad, pdata);
299 if (error) {
300 dev_err(dev, "failed to parse matrix key\n");
301 return error;
302 }
303
304 error = pxa27x_keypad_direct_key_parse_dt(keypad, pdata);
305 if (error) {
306 dev_err(dev, "failed to parse direct key\n");
307 return error;
308 }
309
310 error = pxa27x_keypad_rotary_parse_dt(keypad, pdata);
311 if (error) {
312 dev_err(dev, "failed to parse rotary key\n");
313 return error;
314 }
315
316 error = of_property_read_u32(np, "marvell,debounce-interval",
317 &pdata->debounce_interval);
318 if (error) {
319 dev_err(dev, "failed to parse debounce-interval\n");
320 return error;
321 }
322
323 /*
324 * The keycodes may not only includes matrix key but also the direct
325 * key or rotary key.
326 */
327 input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
328
329 keypad->pdata = pdata;
330 return 0;
331 }
332
333 #else
334
335 static int pxa27x_keypad_build_keycode_from_dt(struct pxa27x_keypad *keypad)
336 {
337 dev_info(keypad->input_dev->dev.parent, "missing platform data\n");
338
339 return -EINVAL;
340 }
341
342 #endif
343
344 static int pxa27x_keypad_build_keycode(struct pxa27x_keypad *keypad)
345 {
346 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
347 struct input_dev *input_dev = keypad->input_dev;
348 unsigned short keycode;
349 int i;
350 int error;
351
352 error = matrix_keypad_build_keymap(pdata->matrix_keymap_data, NULL,
353 pdata->matrix_key_rows,
354 pdata->matrix_key_cols,
355 keypad->keycodes, input_dev);
356 if (error)
357 return error;
358
359 /*
360 * The keycodes may not only include matrix keys but also the direct
361 * or rotary keys.
362 */
363 input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
364
365 /* For direct keys. */
366 for (i = 0; i < pdata->direct_key_num; i++) {
367 keycode = pdata->direct_key_map[i];
368 keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = keycode;
369 __set_bit(keycode, input_dev->keybit);
370 }
371
372 if (pdata->enable_rotary0) {
373 if (pdata->rotary0_up_key && pdata->rotary0_down_key) {
374 keycode = pdata->rotary0_up_key;
375 keypad->keycodes[MAX_MATRIX_KEY_NUM + 0] = keycode;
376 __set_bit(keycode, input_dev->keybit);
377
378 keycode = pdata->rotary0_down_key;
379 keypad->keycodes[MAX_MATRIX_KEY_NUM + 1] = keycode;
380 __set_bit(keycode, input_dev->keybit);
381
382 keypad->rotary_rel_code[0] = -1;
383 } else {
384 keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
385 __set_bit(pdata->rotary0_rel_code, input_dev->relbit);
386 }
387 }
388
389 if (pdata->enable_rotary1) {
390 if (pdata->rotary1_up_key && pdata->rotary1_down_key) {
391 keycode = pdata->rotary1_up_key;
392 keypad->keycodes[MAX_MATRIX_KEY_NUM + 2] = keycode;
393 __set_bit(keycode, input_dev->keybit);
394
395 keycode = pdata->rotary1_down_key;
396 keypad->keycodes[MAX_MATRIX_KEY_NUM + 3] = keycode;
397 __set_bit(keycode, input_dev->keybit);
398
399 keypad->rotary_rel_code[1] = -1;
400 } else {
401 keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
402 __set_bit(pdata->rotary1_rel_code, input_dev->relbit);
403 }
404 }
405
406 __clear_bit(KEY_RESERVED, input_dev->keybit);
407
408 return 0;
409 }
410
411 static void pxa27x_keypad_scan_matrix(struct pxa27x_keypad *keypad)
412 {
413 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
414 struct input_dev *input_dev = keypad->input_dev;
415 int row, col, num_keys_pressed = 0;
416 uint32_t new_state[MAX_MATRIX_KEY_COLS];
417 uint32_t kpas = keypad_readl(KPAS);
418
419 num_keys_pressed = KPAS_MUKP(kpas);
420
421 memset(new_state, 0, sizeof(new_state));
422
423 if (num_keys_pressed == 0)
424 goto scan;
425
426 if (num_keys_pressed == 1) {
427 col = KPAS_CP(kpas);
428 row = KPAS_RP(kpas);
429
430 /* if invalid row/col, treat as no key pressed */
431 if (col >= pdata->matrix_key_cols ||
432 row >= pdata->matrix_key_rows)
433 goto scan;
434
435 new_state[col] = (1 << row);
436 goto scan;
437 }
438
439 if (num_keys_pressed > 1) {
440 uint32_t kpasmkp0 = keypad_readl(KPASMKP0);
441 uint32_t kpasmkp1 = keypad_readl(KPASMKP1);
442 uint32_t kpasmkp2 = keypad_readl(KPASMKP2);
443 uint32_t kpasmkp3 = keypad_readl(KPASMKP3);
444
445 new_state[0] = kpasmkp0 & KPASMKP_MKC_MASK;
446 new_state[1] = (kpasmkp0 >> 16) & KPASMKP_MKC_MASK;
447 new_state[2] = kpasmkp1 & KPASMKP_MKC_MASK;
448 new_state[3] = (kpasmkp1 >> 16) & KPASMKP_MKC_MASK;
449 new_state[4] = kpasmkp2 & KPASMKP_MKC_MASK;
450 new_state[5] = (kpasmkp2 >> 16) & KPASMKP_MKC_MASK;
451 new_state[6] = kpasmkp3 & KPASMKP_MKC_MASK;
452 new_state[7] = (kpasmkp3 >> 16) & KPASMKP_MKC_MASK;
453 }
454 scan:
455 for (col = 0; col < pdata->matrix_key_cols; col++) {
456 uint32_t bits_changed;
457 int code;
458
459 bits_changed = keypad->matrix_key_state[col] ^ new_state[col];
460 if (bits_changed == 0)
461 continue;
462
463 for (row = 0; row < pdata->matrix_key_rows; row++) {
464 if ((bits_changed & (1 << row)) == 0)
465 continue;
466
467 code = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
468
469 input_event(input_dev, EV_MSC, MSC_SCAN, code);
470 input_report_key(input_dev, keypad->keycodes[code],
471 new_state[col] & (1 << row));
472 }
473 }
474 input_sync(input_dev);
475 memcpy(keypad->matrix_key_state, new_state, sizeof(new_state));
476 }
477
478 #define DEFAULT_KPREC (0x007f007f)
479
480 static inline int rotary_delta(uint32_t kprec)
481 {
482 if (kprec & KPREC_OF0)
483 return (kprec & 0xff) + 0x7f;
484 else if (kprec & KPREC_UF0)
485 return (kprec & 0xff) - 0x7f - 0xff;
486 else
487 return (kprec & 0xff) - 0x7f;
488 }
489
490 static void report_rotary_event(struct pxa27x_keypad *keypad, int r, int delta)
491 {
492 struct input_dev *dev = keypad->input_dev;
493
494 if (delta == 0)
495 return;
496
497 if (keypad->rotary_rel_code[r] == -1) {
498 int code = MAX_MATRIX_KEY_NUM + 2 * r + (delta > 0 ? 0 : 1);
499 unsigned char keycode = keypad->keycodes[code];
500
501 /* simulate a press-n-release */
502 input_event(dev, EV_MSC, MSC_SCAN, code);
503 input_report_key(dev, keycode, 1);
504 input_sync(dev);
505 input_event(dev, EV_MSC, MSC_SCAN, code);
506 input_report_key(dev, keycode, 0);
507 input_sync(dev);
508 } else {
509 input_report_rel(dev, keypad->rotary_rel_code[r], delta);
510 input_sync(dev);
511 }
512 }
513
514 static void pxa27x_keypad_scan_rotary(struct pxa27x_keypad *keypad)
515 {
516 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
517 uint32_t kprec;
518
519 /* read and reset to default count value */
520 kprec = keypad_readl(KPREC);
521 keypad_writel(KPREC, DEFAULT_KPREC);
522
523 if (pdata->enable_rotary0)
524 report_rotary_event(keypad, 0, rotary_delta(kprec));
525
526 if (pdata->enable_rotary1)
527 report_rotary_event(keypad, 1, rotary_delta(kprec >> 16));
528 }
529
530 static void pxa27x_keypad_scan_direct(struct pxa27x_keypad *keypad)
531 {
532 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
533 struct input_dev *input_dev = keypad->input_dev;
534 unsigned int new_state;
535 uint32_t kpdk, bits_changed;
536 int i;
537
538 kpdk = keypad_readl(KPDK);
539
540 if (pdata->enable_rotary0 || pdata->enable_rotary1)
541 pxa27x_keypad_scan_rotary(keypad);
542
543 /*
544 * The KPDR_DK only output the key pin level, so it relates to board,
545 * and low level may be active.
546 */
547 if (pdata->direct_key_low_active)
548 new_state = ~KPDK_DK(kpdk) & keypad->direct_key_mask;
549 else
550 new_state = KPDK_DK(kpdk) & keypad->direct_key_mask;
551
552 bits_changed = keypad->direct_key_state ^ new_state;
553
554 if (bits_changed == 0)
555 return;
556
557 for (i = 0; i < pdata->direct_key_num; i++) {
558 if (bits_changed & (1 << i)) {
559 int code = MAX_MATRIX_KEY_NUM + i;
560
561 input_event(input_dev, EV_MSC, MSC_SCAN, code);
562 input_report_key(input_dev, keypad->keycodes[code],
563 new_state & (1 << i));
564 }
565 }
566 input_sync(input_dev);
567 keypad->direct_key_state = new_state;
568 }
569
570 static void clear_wakeup_event(struct pxa27x_keypad *keypad)
571 {
572 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
573
574 if (pdata->clear_wakeup_event)
575 (pdata->clear_wakeup_event)();
576 }
577
578 static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
579 {
580 struct pxa27x_keypad *keypad = dev_id;
581 unsigned long kpc = keypad_readl(KPC);
582
583 clear_wakeup_event(keypad);
584
585 if (kpc & KPC_DI)
586 pxa27x_keypad_scan_direct(keypad);
587
588 if (kpc & KPC_MI)
589 pxa27x_keypad_scan_matrix(keypad);
590
591 return IRQ_HANDLED;
592 }
593
594 static void pxa27x_keypad_config(struct pxa27x_keypad *keypad)
595 {
596 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
597 unsigned int mask = 0, direct_key_num = 0;
598 unsigned long kpc = 0;
599
600 /* clear pending interrupt bit */
601 keypad_readl(KPC);
602
603 /* enable matrix keys with automatic scan */
604 if (pdata->matrix_key_rows && pdata->matrix_key_cols) {
605 kpc |= KPC_ASACT | KPC_MIE | KPC_ME | KPC_MS_ALL;
606 kpc |= KPC_MKRN(pdata->matrix_key_rows) |
607 KPC_MKCN(pdata->matrix_key_cols);
608 }
609
610 /* enable rotary key, debounce interval same as direct keys */
611 if (pdata->enable_rotary0) {
612 mask |= 0x03;
613 direct_key_num = 2;
614 kpc |= KPC_REE0;
615 }
616
617 if (pdata->enable_rotary1) {
618 mask |= 0x0c;
619 direct_key_num = 4;
620 kpc |= KPC_REE1;
621 }
622
623 if (pdata->direct_key_num > direct_key_num)
624 direct_key_num = pdata->direct_key_num;
625
626 /*
627 * Direct keys usage may not start from KP_DKIN0, check the platfrom
628 * mask data to config the specific.
629 */
630 if (pdata->direct_key_mask)
631 keypad->direct_key_mask = pdata->direct_key_mask;
632 else
633 keypad->direct_key_mask = ((1 << direct_key_num) - 1) & ~mask;
634
635 /* enable direct key */
636 if (direct_key_num)
637 kpc |= KPC_DE | KPC_DIE | KPC_DKN(direct_key_num);
638
639 keypad_writel(KPC, kpc | KPC_RE_ZERO_DEB);
640 keypad_writel(KPREC, DEFAULT_KPREC);
641 keypad_writel(KPKDI, pdata->debounce_interval);
642 }
643
644 static int pxa27x_keypad_open(struct input_dev *dev)
645 {
646 struct pxa27x_keypad *keypad = input_get_drvdata(dev);
647 int ret;
648 /* Enable unit clock */
649 ret = clk_prepare_enable(keypad->clk);
650 if (ret)
651 return ret;
652
653 pxa27x_keypad_config(keypad);
654
655 return 0;
656 }
657
658 static void pxa27x_keypad_close(struct input_dev *dev)
659 {
660 struct pxa27x_keypad *keypad = input_get_drvdata(dev);
661
662 /* Disable clock unit */
663 clk_disable_unprepare(keypad->clk);
664 }
665
666 #ifdef CONFIG_PM_SLEEP
667 static int pxa27x_keypad_suspend(struct device *dev)
668 {
669 struct platform_device *pdev = to_platform_device(dev);
670 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
671
672 /*
673 * If the keypad is used a wake up source, clock can not be disabled.
674 * Or it can not detect the key pressing.
675 */
676 if (device_may_wakeup(&pdev->dev))
677 enable_irq_wake(keypad->irq);
678 else
679 clk_disable_unprepare(keypad->clk);
680
681 return 0;
682 }
683
684 static int pxa27x_keypad_resume(struct device *dev)
685 {
686 struct platform_device *pdev = to_platform_device(dev);
687 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
688 struct input_dev *input_dev = keypad->input_dev;
689 int ret = 0;
690
691 /*
692 * If the keypad is used as wake up source, the clock is not turned
693 * off. So do not need configure it again.
694 */
695 if (device_may_wakeup(&pdev->dev)) {
696 disable_irq_wake(keypad->irq);
697 } else {
698 mutex_lock(&input_dev->mutex);
699
700 if (input_dev->users) {
701 /* Enable unit clock */
702 ret = clk_prepare_enable(keypad->clk);
703 if (!ret)
704 pxa27x_keypad_config(keypad);
705 }
706
707 mutex_unlock(&input_dev->mutex);
708 }
709
710 return ret;
711 }
712 #endif
713
714 static SIMPLE_DEV_PM_OPS(pxa27x_keypad_pm_ops,
715 pxa27x_keypad_suspend, pxa27x_keypad_resume);
716
717
718 static int pxa27x_keypad_probe(struct platform_device *pdev)
719 {
720 const struct pxa27x_keypad_platform_data *pdata =
721 dev_get_platdata(&pdev->dev);
722 struct device_node *np = pdev->dev.of_node;
723 struct pxa27x_keypad *keypad;
724 struct input_dev *input_dev;
725 struct resource *res;
726 int irq, error;
727
728 /* Driver need build keycode from device tree or pdata */
729 if (!np && !pdata)
730 return -EINVAL;
731
732 irq = platform_get_irq(pdev, 0);
733 if (irq < 0) {
734 dev_err(&pdev->dev, "failed to get keypad irq\n");
735 return -ENXIO;
736 }
737
738 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
739 if (res == NULL) {
740 dev_err(&pdev->dev, "failed to get I/O memory\n");
741 return -ENXIO;
742 }
743
744 keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad),
745 GFP_KERNEL);
746 if (!keypad)
747 return -ENOMEM;
748
749 input_dev = devm_input_allocate_device(&pdev->dev);
750 if (!input_dev)
751 return -ENOMEM;
752
753 keypad->pdata = pdata;
754 keypad->input_dev = input_dev;
755 keypad->irq = irq;
756
757 keypad->mmio_base = devm_ioremap_resource(&pdev->dev, res);
758 if (IS_ERR(keypad->mmio_base))
759 return PTR_ERR(keypad->mmio_base);
760
761 keypad->clk = devm_clk_get(&pdev->dev, NULL);
762 if (IS_ERR(keypad->clk)) {
763 dev_err(&pdev->dev, "failed to get keypad clock\n");
764 return PTR_ERR(keypad->clk);
765 }
766
767 input_dev->name = pdev->name;
768 input_dev->id.bustype = BUS_HOST;
769 input_dev->open = pxa27x_keypad_open;
770 input_dev->close = pxa27x_keypad_close;
771 input_dev->dev.parent = &pdev->dev;
772
773 input_dev->keycode = keypad->keycodes;
774 input_dev->keycodesize = sizeof(keypad->keycodes[0]);
775 input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
776
777 input_set_drvdata(input_dev, keypad);
778
779 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
780 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
781
782 if (pdata) {
783 error = pxa27x_keypad_build_keycode(keypad);
784 } else {
785 error = pxa27x_keypad_build_keycode_from_dt(keypad);
786 /*
787 * Data that we get from DT resides in dynamically
788 * allocated memory so we need to update our pdata
789 * pointer.
790 */
791 pdata = keypad->pdata;
792 }
793 if (error) {
794 dev_err(&pdev->dev, "failed to build keycode\n");
795 return error;
796 }
797
798 keypad->row_shift = get_count_order(pdata->matrix_key_cols);
799
800 if ((pdata->enable_rotary0 && keypad->rotary_rel_code[0] != -1) ||
801 (pdata->enable_rotary1 && keypad->rotary_rel_code[1] != -1)) {
802 input_dev->evbit[0] |= BIT_MASK(EV_REL);
803 }
804
805 error = devm_request_irq(&pdev->dev, irq, pxa27x_keypad_irq_handler,
806 0, pdev->name, keypad);
807 if (error) {
808 dev_err(&pdev->dev, "failed to request IRQ\n");
809 return error;
810 }
811
812 /* Register the input device */
813 error = input_register_device(input_dev);
814 if (error) {
815 dev_err(&pdev->dev, "failed to register input device\n");
816 return error;
817 }
818
819 platform_set_drvdata(pdev, keypad);
820 device_init_wakeup(&pdev->dev, 1);
821
822 return 0;
823 }
824
825 #ifdef CONFIG_OF
826 static const struct of_device_id pxa27x_keypad_dt_match[] = {
827 { .compatible = "marvell,pxa27x-keypad" },
828 {},
829 };
830 MODULE_DEVICE_TABLE(of, pxa27x_keypad_dt_match);
831 #endif
832
833 static struct platform_driver pxa27x_keypad_driver = {
834 .probe = pxa27x_keypad_probe,
835 .driver = {
836 .name = "pxa27x-keypad",
837 .of_match_table = of_match_ptr(pxa27x_keypad_dt_match),
838 .pm = &pxa27x_keypad_pm_ops,
839 },
840 };
841 module_platform_driver(pxa27x_keypad_driver);
842
843 MODULE_DESCRIPTION("PXA27x Keypad Controller Driver");
844 MODULE_LICENSE("GPL");
845 /* work with hotplug and coldplug */
846 MODULE_ALIAS("platform:pxa27x-keypad");
Linux with added FPC-III support