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ARM: kvm: rename cpu_reset to avoid name clash
[linux-2.6.git] / drivers / input / keyboard / pxa27x_keypad.c
blob134c3b404a54d22a5b7b425c22fc88ea4949cecf
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/init.h>
22 #include <linux/interrupt.h>
23 #include <linux/input.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
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 /* state row bits of each column scan */
115 uint32_t matrix_key_state[MAX_MATRIX_KEY_COLS];
116 uint32_t direct_key_state;
117
118 unsigned int direct_key_mask;
119 };
120
121 #ifdef CONFIG_OF
122 static int pxa27x_keypad_matrix_key_parse_dt(struct pxa27x_keypad *keypad,
123 struct pxa27x_keypad_platform_data *pdata)
124 {
125 struct input_dev *input_dev = keypad->input_dev;
126 struct device *dev = input_dev->dev.parent;
127 u32 rows, cols;
128 int error;
129
130 error = matrix_keypad_parse_of_params(dev, &rows, &cols);
131 if (error)
132 return error;
133
134 if (rows > MAX_MATRIX_KEY_ROWS || cols > MAX_MATRIX_KEY_COLS) {
135 dev_err(dev, "rows or cols exceeds maximum value\n");
136 return -EINVAL;
137 }
138
139 pdata->matrix_key_rows = rows;
140 pdata->matrix_key_cols = cols;
141
142 error = matrix_keypad_build_keymap(NULL, NULL,
143 pdata->matrix_key_rows,
144 pdata->matrix_key_cols,
145 keypad->keycodes, input_dev);
146 if (error)
147 return error;
148
149 return 0;
150 }
151
152 static int pxa27x_keypad_direct_key_parse_dt(struct pxa27x_keypad *keypad,
153 struct pxa27x_keypad_platform_data *pdata)
154 {
155 struct input_dev *input_dev = keypad->input_dev;
156 struct device *dev = input_dev->dev.parent;
157 struct device_node *np = dev->of_node;
158 const __be16 *prop;
159 unsigned short code;
160 unsigned int proplen, size;
161 int i;
162 int error;
163
164 error = of_property_read_u32(np, "marvell,direct-key-count",
165 &pdata->direct_key_num);
166 if (error) {
167 /*
168 * If do not have marvel,direct-key-count defined,
169 * it means direct key is not supported.
170 */
171 return error == -EINVAL ? 0 : error;
172 }
173
174 error = of_property_read_u32(np, "marvell,direct-key-mask",
175 &pdata->direct_key_mask);
176 if (error) {
177 if (error != -EINVAL)
178 return error;
179
180 /*
181 * If marvell,direct-key-mask is not defined, driver will use
182 * default value. Default value is set when configure the keypad.
183 */
184 pdata->direct_key_mask = 0;
185 }
186
187 pdata->direct_key_low_active = of_property_read_bool(np,
188 "marvell,direct-key-low-active");
189
190 prop = of_get_property(np, "marvell,direct-key-map", &proplen);
191 if (!prop)
192 return -EINVAL;
193
194 if (proplen % sizeof(u16))
195 return -EINVAL;
196
197 size = proplen / sizeof(u16);
198
199 /* Only MAX_DIRECT_KEY_NUM is accepted.*/
200 if (size > MAX_DIRECT_KEY_NUM)
201 return -EINVAL;
202
203 for (i = 0; i < size; i++) {
204 code = be16_to_cpup(prop + i);
205 keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = code;
206 __set_bit(code, input_dev->keybit);
207 }
208
209 return 0;
210 }
211
212 static int pxa27x_keypad_rotary_parse_dt(struct pxa27x_keypad *keypad,
213 struct pxa27x_keypad_platform_data *pdata)
214 {
215 const __be32 *prop;
216 int i, relkey_ret;
217 unsigned int code, proplen;
218 const char *rotaryname[2] = {
219 "marvell,rotary0", "marvell,rotary1"};
220 const char relkeyname[] = {"marvell,rotary-rel-key"};
221 struct input_dev *input_dev = keypad->input_dev;
222 struct device *dev = input_dev->dev.parent;
223 struct device_node *np = dev->of_node;
224
225 relkey_ret = of_property_read_u32(np, relkeyname, &code);
226 /* if can read correct rotary key-code, we do not need this. */
227 if (relkey_ret == 0) {
228 unsigned short relcode;
229
230 /* rotary0 taks lower half, rotary1 taks upper half. */
231 relcode = code & 0xffff;
232 pdata->rotary0_rel_code = (code & 0xffff);
233 __set_bit(relcode, input_dev->relbit);
234
235 relcode = code >> 16;
236 pdata->rotary1_rel_code = relcode;
237 __set_bit(relcode, input_dev->relbit);
238 }
239
240 for (i = 0; i < 2; i++) {
241 prop = of_get_property(np, rotaryname[i], &proplen);
242 /*
243 * If the prop is not set, it means keypad does not need
244 * initialize the rotaryX.
245 */
246 if (!prop)
247 continue;
248
249 code = be32_to_cpup(prop);
250 /*
251 * Not all up/down key code are valid.
252 * Now we depends on direct-rel-code.
253 */
254 if ((!(code & 0xffff) || !(code >> 16)) && relkey_ret) {
255 return relkey_ret;
256 } else {
257 unsigned int n = MAX_MATRIX_KEY_NUM + (i << 1);
258 unsigned short keycode;
259
260 keycode = code & 0xffff;
261 keypad->keycodes[n] = keycode;
262 __set_bit(keycode, input_dev->keybit);
263
264 keycode = code >> 16;
265 keypad->keycodes[n + 1] = keycode;
266 __set_bit(keycode, input_dev->keybit);
267
268 if (i == 0)
269 pdata->rotary0_rel_code = -1;
270 else
271 pdata->rotary1_rel_code = -1;
272 }
273 if (i == 0)
274 pdata->enable_rotary0 = 1;
275 else
276 pdata->enable_rotary1 = 1;
277 }
278
279 keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
280 keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
281
282 return 0;
283 }
284
285 static int pxa27x_keypad_build_keycode_from_dt(struct pxa27x_keypad *keypad)
286 {
287 struct input_dev *input_dev = keypad->input_dev;
288 struct device *dev = input_dev->dev.parent;
289 struct device_node *np = dev->of_node;
290 struct pxa27x_keypad_platform_data *pdata;
291 int error;
292
293 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
294 if (!pdata) {
295 dev_err(dev, "failed to allocate memory for pdata\n");
296 return -ENOMEM;
297 }
298
299 error = pxa27x_keypad_matrix_key_parse_dt(keypad, pdata);
300 if (error) {
301 dev_err(dev, "failed to parse matrix key\n");
302 return error;
303 }
304
305 error = pxa27x_keypad_direct_key_parse_dt(keypad, pdata);
306 if (error) {
307 dev_err(dev, "failed to parse direct key\n");
308 return error;
309 }
310
311 error = pxa27x_keypad_rotary_parse_dt(keypad, pdata);
312 if (error) {
313 dev_err(dev, "failed to parse rotary key\n");
314 return error;
315 }
316
317 error = of_property_read_u32(np, "marvell,debounce-interval",
318 &pdata->debounce_interval);
319 if (error) {
320 dev_err(dev, "failed to parse debpunce-interval\n");
321 return error;
322 }
323
324 /*
325 * The keycodes may not only includes matrix key but also the direct
326 * key or rotary key.
327 */
328 input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
329
330 keypad->pdata = pdata;
331 return 0;
332 }
333
334 #else
335
336 static int pxa27x_keypad_build_keycode_from_dt(struct pxa27x_keypad *keypad)
337 {
338 dev_info(keypad->input_dev->dev.parent, "missing platform data\n");
339
340 return -EINVAL;
341 }
342
343 #endif
344
345 static int pxa27x_keypad_build_keycode(struct pxa27x_keypad *keypad)
346 {
347 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
348 struct input_dev *input_dev = keypad->input_dev;
349 const struct matrix_keymap_data *keymap_data =
350 pdata ? pdata->matrix_keymap_data : NULL;
351 unsigned short keycode;
352 int i;
353 int error;
354
355 error = matrix_keypad_build_keymap(keymap_data, NULL,
356 pdata->matrix_key_rows,
357 pdata->matrix_key_cols,
358 keypad->keycodes, input_dev);
359 if (error)
360 return error;
361
362 /*
363 * The keycodes may not only include matrix keys but also the direct
364 * or rotary keys.
365 */
366 input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
367
368 /* For direct keys. */
369 for (i = 0; i < pdata->direct_key_num; i++) {
370 keycode = pdata->direct_key_map[i];
371 keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = keycode;
372 __set_bit(keycode, input_dev->keybit);
373 }
374
375 if (pdata->enable_rotary0) {
376 if (pdata->rotary0_up_key && pdata->rotary0_down_key) {
377 keycode = pdata->rotary0_up_key;
378 keypad->keycodes[MAX_MATRIX_KEY_NUM + 0] = keycode;
379 __set_bit(keycode, input_dev->keybit);
380
381 keycode = pdata->rotary0_down_key;
382 keypad->keycodes[MAX_MATRIX_KEY_NUM + 1] = keycode;
383 __set_bit(keycode, input_dev->keybit);
384
385 keypad->rotary_rel_code[0] = -1;
386 } else {
387 keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
388 __set_bit(pdata->rotary0_rel_code, input_dev->relbit);
389 }
390 }
391
392 if (pdata->enable_rotary1) {
393 if (pdata->rotary1_up_key && pdata->rotary1_down_key) {
394 keycode = pdata->rotary1_up_key;
395 keypad->keycodes[MAX_MATRIX_KEY_NUM + 2] = keycode;
396 __set_bit(keycode, input_dev->keybit);
397
398 keycode = pdata->rotary1_down_key;
399 keypad->keycodes[MAX_MATRIX_KEY_NUM + 3] = keycode;
400 __set_bit(keycode, input_dev->keybit);
401
402 keypad->rotary_rel_code[1] = -1;
403 } else {
404 keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
405 __set_bit(pdata->rotary1_rel_code, input_dev->relbit);
406 }
407 }
408
409 __clear_bit(KEY_RESERVED, input_dev->keybit);
410
411 return 0;
412 }
413
414 static void pxa27x_keypad_scan_matrix(struct pxa27x_keypad *keypad)
415 {
416 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
417 struct input_dev *input_dev = keypad->input_dev;
418 int row, col, num_keys_pressed = 0;
419 uint32_t new_state[MAX_MATRIX_KEY_COLS];
420 uint32_t kpas = keypad_readl(KPAS);
421
422 num_keys_pressed = KPAS_MUKP(kpas);
423
424 memset(new_state, 0, sizeof(new_state));
425
426 if (num_keys_pressed == 0)
427 goto scan;
428
429 if (num_keys_pressed == 1) {
430 col = KPAS_CP(kpas);
431 row = KPAS_RP(kpas);
432
433 /* if invalid row/col, treat as no key pressed */
434 if (col >= pdata->matrix_key_cols ||
435 row >= pdata->matrix_key_rows)
436 goto scan;
437
438 new_state[col] = (1 << row);
439 goto scan;
440 }
441
442 if (num_keys_pressed > 1) {
443 uint32_t kpasmkp0 = keypad_readl(KPASMKP0);
444 uint32_t kpasmkp1 = keypad_readl(KPASMKP1);
445 uint32_t kpasmkp2 = keypad_readl(KPASMKP2);
446 uint32_t kpasmkp3 = keypad_readl(KPASMKP3);
447
448 new_state[0] = kpasmkp0 & KPASMKP_MKC_MASK;
449 new_state[1] = (kpasmkp0 >> 16) & KPASMKP_MKC_MASK;
450 new_state[2] = kpasmkp1 & KPASMKP_MKC_MASK;
451 new_state[3] = (kpasmkp1 >> 16) & KPASMKP_MKC_MASK;
452 new_state[4] = kpasmkp2 & KPASMKP_MKC_MASK;
453 new_state[5] = (kpasmkp2 >> 16) & KPASMKP_MKC_MASK;
454 new_state[6] = kpasmkp3 & KPASMKP_MKC_MASK;
455 new_state[7] = (kpasmkp3 >> 16) & KPASMKP_MKC_MASK;
456 }
457 scan:
458 for (col = 0; col < pdata->matrix_key_cols; col++) {
459 uint32_t bits_changed;
460 int code;
461
462 bits_changed = keypad->matrix_key_state[col] ^ new_state[col];
463 if (bits_changed == 0)
464 continue;
465
466 for (row = 0; row < pdata->matrix_key_rows; row++) {
467 if ((bits_changed & (1 << row)) == 0)
468 continue;
469
470 code = MATRIX_SCAN_CODE(row, col, MATRIX_ROW_SHIFT);
471 input_event(input_dev, EV_MSC, MSC_SCAN, code);
472 input_report_key(input_dev, keypad->keycodes[code],
473 new_state[col] & (1 << row));
474 }
475 }
476 input_sync(input_dev);
477 memcpy(keypad->matrix_key_state, new_state, sizeof(new_state));
478 }
479
480 #define DEFAULT_KPREC (0x007f007f)
481
482 static inline int rotary_delta(uint32_t kprec)
483 {
484 if (kprec & KPREC_OF0)
485 return (kprec & 0xff) + 0x7f;
486 else if (kprec & KPREC_UF0)
487 return (kprec & 0xff) - 0x7f - 0xff;
488 else
489 return (kprec & 0xff) - 0x7f;
490 }
491
492 static void report_rotary_event(struct pxa27x_keypad *keypad, int r, int delta)
493 {
494 struct input_dev *dev = keypad->input_dev;
495
496 if (delta == 0)
497 return;
498
499 if (keypad->rotary_rel_code[r] == -1) {
500 int code = MAX_MATRIX_KEY_NUM + 2 * r + (delta > 0 ? 0 : 1);
501 unsigned char keycode = keypad->keycodes[code];
502
503 /* simulate a press-n-release */
504 input_event(dev, EV_MSC, MSC_SCAN, code);
505 input_report_key(dev, keycode, 1);
506 input_sync(dev);
507 input_event(dev, EV_MSC, MSC_SCAN, code);
508 input_report_key(dev, keycode, 0);
509 input_sync(dev);
510 } else {
511 input_report_rel(dev, keypad->rotary_rel_code[r], delta);
512 input_sync(dev);
513 }
514 }
515
516 static void pxa27x_keypad_scan_rotary(struct pxa27x_keypad *keypad)
517 {
518 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
519 uint32_t kprec;
520
521 /* read and reset to default count value */
522 kprec = keypad_readl(KPREC);
523 keypad_writel(KPREC, DEFAULT_KPREC);
524
525 if (pdata->enable_rotary0)
526 report_rotary_event(keypad, 0, rotary_delta(kprec));
527
528 if (pdata->enable_rotary1)
529 report_rotary_event(keypad, 1, rotary_delta(kprec >> 16));
530 }
531
532 static void pxa27x_keypad_scan_direct(struct pxa27x_keypad *keypad)
533 {
534 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
535 struct input_dev *input_dev = keypad->input_dev;
536 unsigned int new_state;
537 uint32_t kpdk, bits_changed;
538 int i;
539
540 kpdk = keypad_readl(KPDK);
541
542 if (pdata->enable_rotary0 || pdata->enable_rotary1)
543 pxa27x_keypad_scan_rotary(keypad);
544
545 /*
546 * The KPDR_DK only output the key pin level, so it relates to board,
547 * and low level may be active.
548 */
549 if (pdata->direct_key_low_active)
550 new_state = ~KPDK_DK(kpdk) & keypad->direct_key_mask;
551 else
552 new_state = KPDK_DK(kpdk) & keypad->direct_key_mask;
553
554 bits_changed = keypad->direct_key_state ^ new_state;
555
556 if (bits_changed == 0)
557 return;
558
559 for (i = 0; i < pdata->direct_key_num; i++) {
560 if (bits_changed & (1 << i)) {
561 int code = MAX_MATRIX_KEY_NUM + i;
562
563 input_event(input_dev, EV_MSC, MSC_SCAN, code);
564 input_report_key(input_dev, keypad->keycodes[code],
565 new_state & (1 << i));
566 }
567 }
568 input_sync(input_dev);
569 keypad->direct_key_state = new_state;
570 }
571
572 static void clear_wakeup_event(struct pxa27x_keypad *keypad)
573 {
574 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
575
576 if (pdata->clear_wakeup_event)
577 (pdata->clear_wakeup_event)();
578 }
579
580 static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
581 {
582 struct pxa27x_keypad *keypad = dev_id;
583 unsigned long kpc = keypad_readl(KPC);
584
585 clear_wakeup_event(keypad);
586
587 if (kpc & KPC_DI)
588 pxa27x_keypad_scan_direct(keypad);
589
590 if (kpc & KPC_MI)
591 pxa27x_keypad_scan_matrix(keypad);
592
593 return IRQ_HANDLED;
594 }
595
596 static void pxa27x_keypad_config(struct pxa27x_keypad *keypad)
597 {
598 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
599 unsigned int mask = 0, direct_key_num = 0;
600 unsigned long kpc = 0;
601
602 /* clear pending interrupt bit */
603 keypad_readl(KPC);
604
605 /* enable matrix keys with automatic scan */
606 if (pdata->matrix_key_rows && pdata->matrix_key_cols) {
607 kpc |= KPC_ASACT | KPC_MIE | KPC_ME | KPC_MS_ALL;
608 kpc |= KPC_MKRN(pdata->matrix_key_rows) |
609 KPC_MKCN(pdata->matrix_key_cols);
610 }
611
612 /* enable rotary key, debounce interval same as direct keys */
613 if (pdata->enable_rotary0) {
614 mask |= 0x03;
615 direct_key_num = 2;
616 kpc |= KPC_REE0;
617 }
618
619 if (pdata->enable_rotary1) {
620 mask |= 0x0c;
621 direct_key_num = 4;
622 kpc |= KPC_REE1;
623 }
624
625 if (pdata->direct_key_num > direct_key_num)
626 direct_key_num = pdata->direct_key_num;
627
628 /*
629 * Direct keys usage may not start from KP_DKIN0, check the platfrom
630 * mask data to config the specific.
631 */
632 if (pdata->direct_key_mask)
633 keypad->direct_key_mask = pdata->direct_key_mask;
634 else
635 keypad->direct_key_mask = ((1 << direct_key_num) - 1) & ~mask;
636
637 /* enable direct key */
638 if (direct_key_num)
639 kpc |= KPC_DE | KPC_DIE | KPC_DKN(direct_key_num);
640
641 keypad_writel(KPC, kpc | KPC_RE_ZERO_DEB);
642 keypad_writel(KPREC, DEFAULT_KPREC);
643 keypad_writel(KPKDI, pdata->debounce_interval);
644 }
645
646 static int pxa27x_keypad_open(struct input_dev *dev)
647 {
648 struct pxa27x_keypad *keypad = input_get_drvdata(dev);
649
650 /* Enable unit clock */
651 clk_prepare_enable(keypad->clk);
652 pxa27x_keypad_config(keypad);
653
654 return 0;
655 }
656
657 static void pxa27x_keypad_close(struct input_dev *dev)
658 {
659 struct pxa27x_keypad *keypad = input_get_drvdata(dev);
660
661 /* Disable clock unit */
662 clk_disable_unprepare(keypad->clk);
663 }
664
665 #ifdef CONFIG_PM_SLEEP
666 static int pxa27x_keypad_suspend(struct device *dev)
667 {
668 struct platform_device *pdev = to_platform_device(dev);
669 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
670
671 /*
672 * If the keypad is used a wake up source, clock can not be disabled.
673 * Or it can not detect the key pressing.
674 */
675 if (device_may_wakeup(&pdev->dev))
676 enable_irq_wake(keypad->irq);
677 else
678 clk_disable_unprepare(keypad->clk);
679
680 return 0;
681 }
682
683 static int pxa27x_keypad_resume(struct device *dev)
684 {
685 struct platform_device *pdev = to_platform_device(dev);
686 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
687 struct input_dev *input_dev = keypad->input_dev;
688
689 /*
690 * If the keypad is used as wake up source, the clock is not turned
691 * off. So do not need configure it again.
692 */
693 if (device_may_wakeup(&pdev->dev)) {
694 disable_irq_wake(keypad->irq);
695 } else {
696 mutex_lock(&input_dev->mutex);
697
698 if (input_dev->users) {
699 /* Enable unit clock */
700 clk_prepare_enable(keypad->clk);
701 pxa27x_keypad_config(keypad);
702 }
703
704 mutex_unlock(&input_dev->mutex);
705 }
706
707 return 0;
708 }
709 #endif
710
711 static SIMPLE_DEV_PM_OPS(pxa27x_keypad_pm_ops,
712 pxa27x_keypad_suspend, pxa27x_keypad_resume);
713
714
715 static int pxa27x_keypad_probe(struct platform_device *pdev)
716 {
717 const struct pxa27x_keypad_platform_data *pdata =
718 dev_get_platdata(&pdev->dev);
719 struct device_node *np = pdev->dev.of_node;
720 struct pxa27x_keypad *keypad;
721 struct input_dev *input_dev;
722 struct resource *res;
723 int irq, error;
724
725 /* Driver need build keycode from device tree or pdata */
726 if (!np && !pdata)
727 return -EINVAL;
728
729 irq = platform_get_irq(pdev, 0);
730 if (irq < 0) {
731 dev_err(&pdev->dev, "failed to get keypad irq\n");
732 return -ENXIO;
733 }
734
735 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
736 if (res == NULL) {
737 dev_err(&pdev->dev, "failed to get I/O memory\n");
738 return -ENXIO;
739 }
740
741 keypad = kzalloc(sizeof(struct pxa27x_keypad), GFP_KERNEL);
742 input_dev = input_allocate_device();
743 if (!keypad || !input_dev) {
744 dev_err(&pdev->dev, "failed to allocate memory\n");
745 error = -ENOMEM;
746 goto failed_free;
747 }
748
749 keypad->pdata = pdata;
750 keypad->input_dev = input_dev;
751 keypad->irq = irq;
752
753 res = request_mem_region(res->start, resource_size(res), pdev->name);
754 if (res == NULL) {
755 dev_err(&pdev->dev, "failed to request I/O memory\n");
756 error = -EBUSY;
757 goto failed_free;
758 }
759
760 keypad->mmio_base = ioremap(res->start, resource_size(res));
761 if (keypad->mmio_base == NULL) {
762 dev_err(&pdev->dev, "failed to remap I/O memory\n");
763 error = -ENXIO;
764 goto failed_free_mem;
765 }
766
767 keypad->clk = clk_get(&pdev->dev, NULL);
768 if (IS_ERR(keypad->clk)) {
769 dev_err(&pdev->dev, "failed to get keypad clock\n");
770 error = PTR_ERR(keypad->clk);
771 goto failed_free_io;
772 }
773
774 input_dev->name = pdev->name;
775 input_dev->id.bustype = BUS_HOST;
776 input_dev->open = pxa27x_keypad_open;
777 input_dev->close = pxa27x_keypad_close;
778 input_dev->dev.parent = &pdev->dev;
779
780 input_dev->keycode = keypad->keycodes;
781 input_dev->keycodesize = sizeof(keypad->keycodes[0]);
782 input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
783
784 input_set_drvdata(input_dev, keypad);
785
786 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
787 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
788
789 if (pdata)
790 error = pxa27x_keypad_build_keycode(keypad);
791 else
792 error = pxa27x_keypad_build_keycode_from_dt(keypad);
793 if (error) {
794 dev_err(&pdev->dev, "failed to build keycode\n");
795 goto failed_put_clk;
796 }
797
798 if ((pdata->enable_rotary0 && keypad->rotary_rel_code[0] != -1) ||
799 (pdata->enable_rotary1 && keypad->rotary_rel_code[1] != -1)) {
800 input_dev->evbit[0] |= BIT_MASK(EV_REL);
801 }
802
803 error = request_irq(irq, pxa27x_keypad_irq_handler, 0,
804 pdev->name, keypad);
805 if (error) {
806 dev_err(&pdev->dev, "failed to request IRQ\n");
807 goto failed_put_clk;
808 }
809
810 /* Register the input device */
811 error = input_register_device(input_dev);
812 if (error) {
813 dev_err(&pdev->dev, "failed to register input device\n");
814 goto failed_free_irq;
815 }
816
817 platform_set_drvdata(pdev, keypad);
818 device_init_wakeup(&pdev->dev, 1);
819
820 return 0;
821
822 failed_free_irq:
823 free_irq(irq, keypad);
824 failed_put_clk:
825 clk_put(keypad->clk);
826 failed_free_io:
827 iounmap(keypad->mmio_base);
828 failed_free_mem:
829 release_mem_region(res->start, resource_size(res));
830 failed_free:
831 input_free_device(input_dev);
832 kfree(keypad);
833 return error;
834 }
835
836 static int pxa27x_keypad_remove(struct platform_device *pdev)
837 {
838 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
839 struct resource *res;
840
841 free_irq(keypad->irq, keypad);
842 clk_put(keypad->clk);
843
844 input_unregister_device(keypad->input_dev);
845 iounmap(keypad->mmio_base);
846
847 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
848 release_mem_region(res->start, resource_size(res));
849
850 kfree(keypad);
851
852 return 0;
853 }
854
855 /* work with hotplug and coldplug */
856 MODULE_ALIAS("platform:pxa27x-keypad");
857
858 #ifdef CONFIG_OF
859 static const struct of_device_id pxa27x_keypad_dt_match[] = {
860 { .compatible = "marvell,pxa27x-keypad" },
861 {},
862 };
863 MODULE_DEVICE_TABLE(of, pxa27x_keypad_dt_match);
864 #endif
865
866 static struct platform_driver pxa27x_keypad_driver = {
867 .probe = pxa27x_keypad_probe,
868 .remove = pxa27x_keypad_remove,
869 .driver = {
870 .name = "pxa27x-keypad",
871 .of_match_table = of_match_ptr(pxa27x_keypad_dt_match),
872 .owner = THIS_MODULE,
873 .pm = &pxa27x_keypad_pm_ops,
874 },
875 };
876 module_platform_driver(pxa27x_keypad_driver);
877
878 MODULE_DESCRIPTION("PXA27x Keypad Controller Driver");
879 MODULE_LICENSE("GPL");
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