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Linux 3.18.86
[linux/fpc-iii.git] / drivers / input / keyboard / pxa27x_keypad.c
bloba15063bea70020bc44b060a5e9aff8e8133de09e
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/device.h>
24 #include <linux/platform_device.h>
25 #include <linux/clk.h>
26 #include <linux/err.h>
27 #include <linux/input/matrix_keypad.h>
28 #include <linux/slab.h>
29 #include <linux/of.h>
30
31 #include <asm/mach/arch.h>
32 #include <asm/mach/map.h>
33
34 #include <mach/hardware.h>
35 #include <linux/platform_data/keypad-pxa27x.h>
36 /*
37 * Keypad Controller registers
38 */
39 #define KPC 0x0000 /* Keypad Control register */
40 #define KPDK 0x0008 /* Keypad Direct Key register */
41 #define KPREC 0x0010 /* Keypad Rotary Encoder register */
42 #define KPMK 0x0018 /* Keypad Matrix Key register */
43 #define KPAS 0x0020 /* Keypad Automatic Scan register */
44
45 /* Keypad Automatic Scan Multiple Key Presser register 0-3 */
46 #define KPASMKP0 0x0028
47 #define KPASMKP1 0x0030
48 #define KPASMKP2 0x0038
49 #define KPASMKP3 0x0040
50 #define KPKDI 0x0048
51
52 /* bit definitions */
53 #define KPC_MKRN(n) ((((n) - 1) & 0x7) << 26) /* matrix key row number */
54 #define KPC_MKCN(n) ((((n) - 1) & 0x7) << 23) /* matrix key column number */
55 #define KPC_DKN(n) ((((n) - 1) & 0x7) << 6) /* direct key number */
56
57 #define KPC_AS (0x1 << 30) /* Automatic Scan bit */
58 #define KPC_ASACT (0x1 << 29) /* Automatic Scan on Activity */
59 #define KPC_MI (0x1 << 22) /* Matrix interrupt bit */
60 #define KPC_IMKP (0x1 << 21) /* Ignore Multiple Key Press */
61
62 #define KPC_MS(n) (0x1 << (13 + (n))) /* Matrix scan line 'n' */
63 #define KPC_MS_ALL (0xff << 13)
64
65 #define KPC_ME (0x1 << 12) /* Matrix Keypad Enable */
66 #define KPC_MIE (0x1 << 11) /* Matrix Interrupt Enable */
67 #define KPC_DK_DEB_SEL (0x1 << 9) /* Direct Keypad Debounce Select */
68 #define KPC_DI (0x1 << 5) /* Direct key interrupt bit */
69 #define KPC_RE_ZERO_DEB (0x1 << 4) /* Rotary Encoder Zero Debounce */
70 #define KPC_REE1 (0x1 << 3) /* Rotary Encoder1 Enable */
71 #define KPC_REE0 (0x1 << 2) /* Rotary Encoder0 Enable */
72 #define KPC_DE (0x1 << 1) /* Direct Keypad Enable */
73 #define KPC_DIE (0x1 << 0) /* Direct Keypad interrupt Enable */
74
75 #define KPDK_DKP (0x1 << 31)
76 #define KPDK_DK(n) ((n) & 0xff)
77
78 #define KPREC_OF1 (0x1 << 31)
79 #define kPREC_UF1 (0x1 << 30)
80 #define KPREC_OF0 (0x1 << 15)
81 #define KPREC_UF0 (0x1 << 14)
82
83 #define KPREC_RECOUNT0(n) ((n) & 0xff)
84 #define KPREC_RECOUNT1(n) (((n) >> 16) & 0xff)
85
86 #define KPMK_MKP (0x1 << 31)
87 #define KPAS_SO (0x1 << 31)
88 #define KPASMKPx_SO (0x1 << 31)
89
90 #define KPAS_MUKP(n) (((n) >> 26) & 0x1f)
91 #define KPAS_RP(n) (((n) >> 4) & 0xf)
92 #define KPAS_CP(n) ((n) & 0xf)
93
94 #define KPASMKP_MKC_MASK (0xff)
95
96 #define keypad_readl(off) __raw_readl(keypad->mmio_base + (off))
97 #define keypad_writel(off, v) __raw_writel((v), keypad->mmio_base + (off))
98
99 #define MAX_MATRIX_KEY_NUM (MAX_MATRIX_KEY_ROWS * MAX_MATRIX_KEY_COLS)
100 #define MAX_KEYPAD_KEYS (MAX_MATRIX_KEY_NUM + MAX_DIRECT_KEY_NUM)
101
102 struct pxa27x_keypad {
103 const struct pxa27x_keypad_platform_data *pdata;
104
105 struct clk *clk;
106 struct input_dev *input_dev;
107 void __iomem *mmio_base;
108
109 int irq;
110
111 unsigned short keycodes[MAX_KEYPAD_KEYS];
112 int rotary_rel_code[2];
113
114 unsigned int row_shift;
115
116 /* state row bits of each column scan */
117 uint32_t matrix_key_state[MAX_MATRIX_KEY_COLS];
118 uint32_t direct_key_state;
119
120 unsigned int direct_key_mask;
121 };
122
123 #ifdef CONFIG_OF
124 static int pxa27x_keypad_matrix_key_parse_dt(struct pxa27x_keypad *keypad,
125 struct pxa27x_keypad_platform_data *pdata)
126 {
127 struct input_dev *input_dev = keypad->input_dev;
128 struct device *dev = input_dev->dev.parent;
129 u32 rows, cols;
130 int error;
131
132 error = matrix_keypad_parse_of_params(dev, &rows, &cols);
133 if (error)
134 return error;
135
136 if (rows > MAX_MATRIX_KEY_ROWS || cols > MAX_MATRIX_KEY_COLS) {
137 dev_err(dev, "rows or cols exceeds maximum value\n");
138 return -EINVAL;
139 }
140
141 pdata->matrix_key_rows = rows;
142 pdata->matrix_key_cols = cols;
143
144 error = matrix_keypad_build_keymap(NULL, NULL,
145 pdata->matrix_key_rows,
146 pdata->matrix_key_cols,
147 keypad->keycodes, input_dev);
148 if (error)
149 return error;
150
151 return 0;
152 }
153
154 static int pxa27x_keypad_direct_key_parse_dt(struct pxa27x_keypad *keypad,
155 struct pxa27x_keypad_platform_data *pdata)
156 {
157 struct input_dev *input_dev = keypad->input_dev;
158 struct device *dev = input_dev->dev.parent;
159 struct device_node *np = dev->of_node;
160 const __be16 *prop;
161 unsigned short code;
162 unsigned int proplen, size;
163 int i;
164 int error;
165
166 error = of_property_read_u32(np, "marvell,direct-key-count",
167 &pdata->direct_key_num);
168 if (error) {
169 /*
170 * If do not have marvel,direct-key-count defined,
171 * it means direct key is not supported.
172 */
173 return error == -EINVAL ? 0 : error;
174 }
175
176 error = of_property_read_u32(np, "marvell,direct-key-mask",
177 &pdata->direct_key_mask);
178 if (error) {
179 if (error != -EINVAL)
180 return error;
181
182 /*
183 * If marvell,direct-key-mask is not defined, driver will use
184 * default value. Default value is set when configure the keypad.
185 */
186 pdata->direct_key_mask = 0;
187 }
188
189 pdata->direct_key_low_active = of_property_read_bool(np,
190 "marvell,direct-key-low-active");
191
192 prop = of_get_property(np, "marvell,direct-key-map", &proplen);
193 if (!prop)
194 return -EINVAL;
195
196 if (proplen % sizeof(u16))
197 return -EINVAL;
198
199 size = proplen / sizeof(u16);
200
201 /* Only MAX_DIRECT_KEY_NUM is accepted.*/
202 if (size > MAX_DIRECT_KEY_NUM)
203 return -EINVAL;
204
205 for (i = 0; i < size; i++) {
206 code = be16_to_cpup(prop + i);
207 keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = code;
208 __set_bit(code, input_dev->keybit);
209 }
210
211 return 0;
212 }
213
214 static int pxa27x_keypad_rotary_parse_dt(struct pxa27x_keypad *keypad,
215 struct pxa27x_keypad_platform_data *pdata)
216 {
217 const __be32 *prop;
218 int i, relkey_ret;
219 unsigned int code, proplen;
220 const char *rotaryname[2] = {
221 "marvell,rotary0", "marvell,rotary1"};
222 const char relkeyname[] = {"marvell,rotary-rel-key"};
223 struct input_dev *input_dev = keypad->input_dev;
224 struct device *dev = input_dev->dev.parent;
225 struct device_node *np = dev->of_node;
226
227 relkey_ret = of_property_read_u32(np, relkeyname, &code);
228 /* if can read correct rotary key-code, we do not need this. */
229 if (relkey_ret == 0) {
230 unsigned short relcode;
231
232 /* rotary0 taks lower half, rotary1 taks upper half. */
233 relcode = code & 0xffff;
234 pdata->rotary0_rel_code = (code & 0xffff);
235 __set_bit(relcode, input_dev->relbit);
236
237 relcode = code >> 16;
238 pdata->rotary1_rel_code = relcode;
239 __set_bit(relcode, input_dev->relbit);
240 }
241
242 for (i = 0; i < 2; i++) {
243 prop = of_get_property(np, rotaryname[i], &proplen);
244 /*
245 * If the prop is not set, it means keypad does not need
246 * initialize the rotaryX.
247 */
248 if (!prop)
249 continue;
250
251 code = be32_to_cpup(prop);
252 /*
253 * Not all up/down key code are valid.
254 * Now we depends on direct-rel-code.
255 */
256 if ((!(code & 0xffff) || !(code >> 16)) && relkey_ret) {
257 return relkey_ret;
258 } else {
259 unsigned int n = MAX_MATRIX_KEY_NUM + (i << 1);
260 unsigned short keycode;
261
262 keycode = code & 0xffff;
263 keypad->keycodes[n] = keycode;
264 __set_bit(keycode, input_dev->keybit);
265
266 keycode = code >> 16;
267 keypad->keycodes[n + 1] = keycode;
268 __set_bit(keycode, input_dev->keybit);
269
270 if (i == 0)
271 pdata->rotary0_rel_code = -1;
272 else
273 pdata->rotary1_rel_code = -1;
274 }
275 if (i == 0)
276 pdata->enable_rotary0 = 1;
277 else
278 pdata->enable_rotary1 = 1;
279 }
280
281 keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
282 keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
283
284 return 0;
285 }
286
287 static int pxa27x_keypad_build_keycode_from_dt(struct pxa27x_keypad *keypad)
288 {
289 struct input_dev *input_dev = keypad->input_dev;
290 struct device *dev = input_dev->dev.parent;
291 struct device_node *np = dev->of_node;
292 struct pxa27x_keypad_platform_data *pdata;
293 int error;
294
295 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
296 if (!pdata) {
297 dev_err(dev, "failed to allocate memory for pdata\n");
298 return -ENOMEM;
299 }
300
301 error = pxa27x_keypad_matrix_key_parse_dt(keypad, pdata);
302 if (error) {
303 dev_err(dev, "failed to parse matrix key\n");
304 return error;
305 }
306
307 error = pxa27x_keypad_direct_key_parse_dt(keypad, pdata);
308 if (error) {
309 dev_err(dev, "failed to parse direct key\n");
310 return error;
311 }
312
313 error = pxa27x_keypad_rotary_parse_dt(keypad, pdata);
314 if (error) {
315 dev_err(dev, "failed to parse rotary key\n");
316 return error;
317 }
318
319 error = of_property_read_u32(np, "marvell,debounce-interval",
320 &pdata->debounce_interval);
321 if (error) {
322 dev_err(dev, "failed to parse debpunce-interval\n");
323 return error;
324 }
325
326 /*
327 * The keycodes may not only includes matrix key but also the direct
328 * key or rotary key.
329 */
330 input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
331
332 keypad->pdata = pdata;
333 return 0;
334 }
335
336 #else
337
338 static int pxa27x_keypad_build_keycode_from_dt(struct pxa27x_keypad *keypad)
339 {
340 dev_info(keypad->input_dev->dev.parent, "missing platform data\n");
341
342 return -EINVAL;
343 }
344
345 #endif
346
347 static int pxa27x_keypad_build_keycode(struct pxa27x_keypad *keypad)
348 {
349 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
350 struct input_dev *input_dev = keypad->input_dev;
351 const struct matrix_keymap_data *keymap_data =
352 pdata ? pdata->matrix_keymap_data : NULL;
353 unsigned short keycode;
354 int i;
355 int error;
356
357 error = matrix_keypad_build_keymap(keymap_data, NULL,
358 pdata->matrix_key_rows,
359 pdata->matrix_key_cols,
360 keypad->keycodes, input_dev);
361 if (error)
362 return error;
363
364 /*
365 * The keycodes may not only include matrix keys but also the direct
366 * or rotary keys.
367 */
368 input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
369
370 /* For direct keys. */
371 for (i = 0; i < pdata->direct_key_num; i++) {
372 keycode = pdata->direct_key_map[i];
373 keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = keycode;
374 __set_bit(keycode, input_dev->keybit);
375 }
376
377 if (pdata->enable_rotary0) {
378 if (pdata->rotary0_up_key && pdata->rotary0_down_key) {
379 keycode = pdata->rotary0_up_key;
380 keypad->keycodes[MAX_MATRIX_KEY_NUM + 0] = keycode;
381 __set_bit(keycode, input_dev->keybit);
382
383 keycode = pdata->rotary0_down_key;
384 keypad->keycodes[MAX_MATRIX_KEY_NUM + 1] = keycode;
385 __set_bit(keycode, input_dev->keybit);
386
387 keypad->rotary_rel_code[0] = -1;
388 } else {
389 keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
390 __set_bit(pdata->rotary0_rel_code, input_dev->relbit);
391 }
392 }
393
394 if (pdata->enable_rotary1) {
395 if (pdata->rotary1_up_key && pdata->rotary1_down_key) {
396 keycode = pdata->rotary1_up_key;
397 keypad->keycodes[MAX_MATRIX_KEY_NUM + 2] = keycode;
398 __set_bit(keycode, input_dev->keybit);
399
400 keycode = pdata->rotary1_down_key;
401 keypad->keycodes[MAX_MATRIX_KEY_NUM + 3] = keycode;
402 __set_bit(keycode, input_dev->keybit);
403
404 keypad->rotary_rel_code[1] = -1;
405 } else {
406 keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
407 __set_bit(pdata->rotary1_rel_code, input_dev->relbit);
408 }
409 }
410
411 __clear_bit(KEY_RESERVED, input_dev->keybit);
412
413 return 0;
414 }
415
416 static void pxa27x_keypad_scan_matrix(struct pxa27x_keypad *keypad)
417 {
418 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
419 struct input_dev *input_dev = keypad->input_dev;
420 int row, col, num_keys_pressed = 0;
421 uint32_t new_state[MAX_MATRIX_KEY_COLS];
422 uint32_t kpas = keypad_readl(KPAS);
423
424 num_keys_pressed = KPAS_MUKP(kpas);
425
426 memset(new_state, 0, sizeof(new_state));
427
428 if (num_keys_pressed == 0)
429 goto scan;
430
431 if (num_keys_pressed == 1) {
432 col = KPAS_CP(kpas);
433 row = KPAS_RP(kpas);
434
435 /* if invalid row/col, treat as no key pressed */
436 if (col >= pdata->matrix_key_cols ||
437 row >= pdata->matrix_key_rows)
438 goto scan;
439
440 new_state[col] = (1 << row);
441 goto scan;
442 }
443
444 if (num_keys_pressed > 1) {
445 uint32_t kpasmkp0 = keypad_readl(KPASMKP0);
446 uint32_t kpasmkp1 = keypad_readl(KPASMKP1);
447 uint32_t kpasmkp2 = keypad_readl(KPASMKP2);
448 uint32_t kpasmkp3 = keypad_readl(KPASMKP3);
449
450 new_state[0] = kpasmkp0 & KPASMKP_MKC_MASK;
451 new_state[1] = (kpasmkp0 >> 16) & KPASMKP_MKC_MASK;
452 new_state[2] = kpasmkp1 & KPASMKP_MKC_MASK;
453 new_state[3] = (kpasmkp1 >> 16) & KPASMKP_MKC_MASK;
454 new_state[4] = kpasmkp2 & KPASMKP_MKC_MASK;
455 new_state[5] = (kpasmkp2 >> 16) & KPASMKP_MKC_MASK;
456 new_state[6] = kpasmkp3 & KPASMKP_MKC_MASK;
457 new_state[7] = (kpasmkp3 >> 16) & KPASMKP_MKC_MASK;
458 }
459 scan:
460 for (col = 0; col < pdata->matrix_key_cols; col++) {
461 uint32_t bits_changed;
462 int code;
463
464 bits_changed = keypad->matrix_key_state[col] ^ new_state[col];
465 if (bits_changed == 0)
466 continue;
467
468 for (row = 0; row < pdata->matrix_key_rows; row++) {
469 if ((bits_changed & (1 << row)) == 0)
470 continue;
471
472 code = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
473
474 input_event(input_dev, EV_MSC, MSC_SCAN, code);
475 input_report_key(input_dev, keypad->keycodes[code],
476 new_state[col] & (1 << row));
477 }
478 }
479 input_sync(input_dev);
480 memcpy(keypad->matrix_key_state, new_state, sizeof(new_state));
481 }
482
483 #define DEFAULT_KPREC (0x007f007f)
484
485 static inline int rotary_delta(uint32_t kprec)
486 {
487 if (kprec & KPREC_OF0)
488 return (kprec & 0xff) + 0x7f;
489 else if (kprec & KPREC_UF0)
490 return (kprec & 0xff) - 0x7f - 0xff;
491 else
492 return (kprec & 0xff) - 0x7f;
493 }
494
495 static void report_rotary_event(struct pxa27x_keypad *keypad, int r, int delta)
496 {
497 struct input_dev *dev = keypad->input_dev;
498
499 if (delta == 0)
500 return;
501
502 if (keypad->rotary_rel_code[r] == -1) {
503 int code = MAX_MATRIX_KEY_NUM + 2 * r + (delta > 0 ? 0 : 1);
504 unsigned char keycode = keypad->keycodes[code];
505
506 /* simulate a press-n-release */
507 input_event(dev, EV_MSC, MSC_SCAN, code);
508 input_report_key(dev, keycode, 1);
509 input_sync(dev);
510 input_event(dev, EV_MSC, MSC_SCAN, code);
511 input_report_key(dev, keycode, 0);
512 input_sync(dev);
513 } else {
514 input_report_rel(dev, keypad->rotary_rel_code[r], delta);
515 input_sync(dev);
516 }
517 }
518
519 static void pxa27x_keypad_scan_rotary(struct pxa27x_keypad *keypad)
520 {
521 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
522 uint32_t kprec;
523
524 /* read and reset to default count value */
525 kprec = keypad_readl(KPREC);
526 keypad_writel(KPREC, DEFAULT_KPREC);
527
528 if (pdata->enable_rotary0)
529 report_rotary_event(keypad, 0, rotary_delta(kprec));
530
531 if (pdata->enable_rotary1)
532 report_rotary_event(keypad, 1, rotary_delta(kprec >> 16));
533 }
534
535 static void pxa27x_keypad_scan_direct(struct pxa27x_keypad *keypad)
536 {
537 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
538 struct input_dev *input_dev = keypad->input_dev;
539 unsigned int new_state;
540 uint32_t kpdk, bits_changed;
541 int i;
542
543 kpdk = keypad_readl(KPDK);
544
545 if (pdata->enable_rotary0 || pdata->enable_rotary1)
546 pxa27x_keypad_scan_rotary(keypad);
547
548 /*
549 * The KPDR_DK only output the key pin level, so it relates to board,
550 * and low level may be active.
551 */
552 if (pdata->direct_key_low_active)
553 new_state = ~KPDK_DK(kpdk) & keypad->direct_key_mask;
554 else
555 new_state = KPDK_DK(kpdk) & keypad->direct_key_mask;
556
557 bits_changed = keypad->direct_key_state ^ new_state;
558
559 if (bits_changed == 0)
560 return;
561
562 for (i = 0; i < pdata->direct_key_num; i++) {
563 if (bits_changed & (1 << i)) {
564 int code = MAX_MATRIX_KEY_NUM + i;
565
566 input_event(input_dev, EV_MSC, MSC_SCAN, code);
567 input_report_key(input_dev, keypad->keycodes[code],
568 new_state & (1 << i));
569 }
570 }
571 input_sync(input_dev);
572 keypad->direct_key_state = new_state;
573 }
574
575 static void clear_wakeup_event(struct pxa27x_keypad *keypad)
576 {
577 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
578
579 if (pdata->clear_wakeup_event)
580 (pdata->clear_wakeup_event)();
581 }
582
583 static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
584 {
585 struct pxa27x_keypad *keypad = dev_id;
586 unsigned long kpc = keypad_readl(KPC);
587
588 clear_wakeup_event(keypad);
589
590 if (kpc & KPC_DI)
591 pxa27x_keypad_scan_direct(keypad);
592
593 if (kpc & KPC_MI)
594 pxa27x_keypad_scan_matrix(keypad);
595
596 return IRQ_HANDLED;
597 }
598
599 static void pxa27x_keypad_config(struct pxa27x_keypad *keypad)
600 {
601 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
602 unsigned int mask = 0, direct_key_num = 0;
603 unsigned long kpc = 0;
604
605 /* clear pending interrupt bit */
606 keypad_readl(KPC);
607
608 /* enable matrix keys with automatic scan */
609 if (pdata->matrix_key_rows && pdata->matrix_key_cols) {
610 kpc |= KPC_ASACT | KPC_MIE | KPC_ME | KPC_MS_ALL;
611 kpc |= KPC_MKRN(pdata->matrix_key_rows) |
612 KPC_MKCN(pdata->matrix_key_cols);
613 }
614
615 /* enable rotary key, debounce interval same as direct keys */
616 if (pdata->enable_rotary0) {
617 mask |= 0x03;
618 direct_key_num = 2;
619 kpc |= KPC_REE0;
620 }
621
622 if (pdata->enable_rotary1) {
623 mask |= 0x0c;
624 direct_key_num = 4;
625 kpc |= KPC_REE1;
626 }
627
628 if (pdata->direct_key_num > direct_key_num)
629 direct_key_num = pdata->direct_key_num;
630
631 /*
632 * Direct keys usage may not start from KP_DKIN0, check the platfrom
633 * mask data to config the specific.
634 */
635 if (pdata->direct_key_mask)
636 keypad->direct_key_mask = pdata->direct_key_mask;
637 else
638 keypad->direct_key_mask = ((1 << direct_key_num) - 1) & ~mask;
639
640 /* enable direct key */
641 if (direct_key_num)
642 kpc |= KPC_DE | KPC_DIE | KPC_DKN(direct_key_num);
643
644 keypad_writel(KPC, kpc | KPC_RE_ZERO_DEB);
645 keypad_writel(KPREC, DEFAULT_KPREC);
646 keypad_writel(KPKDI, pdata->debounce_interval);
647 }
648
649 static int pxa27x_keypad_open(struct input_dev *dev)
650 {
651 struct pxa27x_keypad *keypad = input_get_drvdata(dev);
652
653 /* Enable unit clock */
654 clk_prepare_enable(keypad->clk);
655 pxa27x_keypad_config(keypad);
656
657 return 0;
658 }
659
660 static void pxa27x_keypad_close(struct input_dev *dev)
661 {
662 struct pxa27x_keypad *keypad = input_get_drvdata(dev);
663
664 /* Disable clock unit */
665 clk_disable_unprepare(keypad->clk);
666 }
667
668 #ifdef CONFIG_PM_SLEEP
669 static int pxa27x_keypad_suspend(struct device *dev)
670 {
671 struct platform_device *pdev = to_platform_device(dev);
672 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
673
674 /*
675 * If the keypad is used a wake up source, clock can not be disabled.
676 * Or it can not detect the key pressing.
677 */
678 if (device_may_wakeup(&pdev->dev))
679 enable_irq_wake(keypad->irq);
680 else
681 clk_disable_unprepare(keypad->clk);
682
683 return 0;
684 }
685
686 static int pxa27x_keypad_resume(struct device *dev)
687 {
688 struct platform_device *pdev = to_platform_device(dev);
689 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
690 struct input_dev *input_dev = keypad->input_dev;
691
692 /*
693 * If the keypad is used as wake up source, the clock is not turned
694 * off. So do not need configure it again.
695 */
696 if (device_may_wakeup(&pdev->dev)) {
697 disable_irq_wake(keypad->irq);
698 } else {
699 mutex_lock(&input_dev->mutex);
700
701 if (input_dev->users) {
702 /* Enable unit clock */
703 clk_prepare_enable(keypad->clk);
704 pxa27x_keypad_config(keypad);
705 }
706
707 mutex_unlock(&input_dev->mutex);
708 }
709
710 return 0;
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 = kzalloc(sizeof(struct pxa27x_keypad), GFP_KERNEL);
745 input_dev = input_allocate_device();
746 if (!keypad || !input_dev) {
747 dev_err(&pdev->dev, "failed to allocate memory\n");
748 error = -ENOMEM;
749 goto failed_free;
750 }
751
752 keypad->pdata = pdata;
753 keypad->input_dev = input_dev;
754 keypad->irq = irq;
755
756 res = request_mem_region(res->start, resource_size(res), pdev->name);
757 if (res == NULL) {
758 dev_err(&pdev->dev, "failed to request I/O memory\n");
759 error = -EBUSY;
760 goto failed_free;
761 }
762
763 keypad->mmio_base = ioremap(res->start, resource_size(res));
764 if (keypad->mmio_base == NULL) {
765 dev_err(&pdev->dev, "failed to remap I/O memory\n");
766 error = -ENXIO;
767 goto failed_free_mem;
768 }
769
770 keypad->clk = clk_get(&pdev->dev, NULL);
771 if (IS_ERR(keypad->clk)) {
772 dev_err(&pdev->dev, "failed to get keypad clock\n");
773 error = PTR_ERR(keypad->clk);
774 goto failed_free_io;
775 }
776
777 input_dev->name = pdev->name;
778 input_dev->id.bustype = BUS_HOST;
779 input_dev->open = pxa27x_keypad_open;
780 input_dev->close = pxa27x_keypad_close;
781 input_dev->dev.parent = &pdev->dev;
782
783 input_dev->keycode = keypad->keycodes;
784 input_dev->keycodesize = sizeof(keypad->keycodes[0]);
785 input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
786
787 input_set_drvdata(input_dev, keypad);
788
789 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
790 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
791
792 if (pdata) {
793 error = pxa27x_keypad_build_keycode(keypad);
794 } else {
795 error = pxa27x_keypad_build_keycode_from_dt(keypad);
796 /*
797 * Data that we get from DT resides in dynamically
798 * allocated memory so we need to update our pdata
799 * pointer.
800 */
801 pdata = keypad->pdata;
802 }
803 if (error) {
804 dev_err(&pdev->dev, "failed to build keycode\n");
805 goto failed_put_clk;
806 }
807
808 keypad->row_shift = get_count_order(pdata->matrix_key_cols);
809
810 if ((pdata->enable_rotary0 && keypad->rotary_rel_code[0] != -1) ||
811 (pdata->enable_rotary1 && keypad->rotary_rel_code[1] != -1)) {
812 input_dev->evbit[0] |= BIT_MASK(EV_REL);
813 }
814
815 error = request_irq(irq, pxa27x_keypad_irq_handler, 0,
816 pdev->name, keypad);
817 if (error) {
818 dev_err(&pdev->dev, "failed to request IRQ\n");
819 goto failed_put_clk;
820 }
821
822 /* Register the input device */
823 error = input_register_device(input_dev);
824 if (error) {
825 dev_err(&pdev->dev, "failed to register input device\n");
826 goto failed_free_irq;
827 }
828
829 platform_set_drvdata(pdev, keypad);
830 device_init_wakeup(&pdev->dev, 1);
831
832 return 0;
833
834 failed_free_irq:
835 free_irq(irq, keypad);
836 failed_put_clk:
837 clk_put(keypad->clk);
838 failed_free_io:
839 iounmap(keypad->mmio_base);
840 failed_free_mem:
841 release_mem_region(res->start, resource_size(res));
842 failed_free:
843 input_free_device(input_dev);
844 kfree(keypad);
845 return error;
846 }
847
848 static int pxa27x_keypad_remove(struct platform_device *pdev)
849 {
850 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
851 struct resource *res;
852
853 free_irq(keypad->irq, keypad);
854 clk_put(keypad->clk);
855
856 input_unregister_device(keypad->input_dev);
857 iounmap(keypad->mmio_base);
858
859 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
860 release_mem_region(res->start, resource_size(res));
861
862 kfree(keypad);
863
864 return 0;
865 }
866
867 /* work with hotplug and coldplug */
868 MODULE_ALIAS("platform:pxa27x-keypad");
869
870 #ifdef CONFIG_OF
871 static const struct of_device_id pxa27x_keypad_dt_match[] = {
872 { .compatible = "marvell,pxa27x-keypad" },
873 {},
874 };
875 MODULE_DEVICE_TABLE(of, pxa27x_keypad_dt_match);
876 #endif
877
878 static struct platform_driver pxa27x_keypad_driver = {
879 .probe = pxa27x_keypad_probe,
880 .remove = pxa27x_keypad_remove,
881 .driver = {
882 .name = "pxa27x-keypad",
883 .of_match_table = of_match_ptr(pxa27x_keypad_dt_match),
884 .owner = THIS_MODULE,
885 .pm = &pxa27x_keypad_pm_ops,
886 },
887 };
888 module_platform_driver(pxa27x_keypad_driver);
889
890 MODULE_DESCRIPTION("PXA27x Keypad Controller Driver");
891 MODULE_LICENSE("GPL");
Linux with added FPC-III support