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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / input / keyboard / pxa27x_keypad.c
blob7e65708b25a44a56f1f3d7dd43e22cfaff3ad327
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/drivers/input/keyboard/pxa27x_keypad.c
4 *
5 * Driver for the pxa27x matrix keyboard controller.
6 *
7 * Created: Feb 22, 2007
8 * Author: Rodolfo Giometti <giometti@linux.it>
9 *
10 * Based on a previous implementations by Kevin O'Connor
11 * <kevin_at_koconnor.net> and Alex Osborne <bobofdoom@gmail.com> and
12 * on some suggestions by Nicolas Pitre <nico@fluxnic.net>.
13 */
14
15
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/interrupt.h>
19 #include <linux/input.h>
20 #include <linux/io.h>
21 #include <linux/device.h>
22 #include <linux/platform_device.h>
23 #include <linux/clk.h>
24 #include <linux/err.h>
25 #include <linux/input/matrix_keypad.h>
26 #include <linux/slab.h>
27 #include <linux/of.h>
28
29 #include <linux/platform_data/keypad-pxa27x.h>
30 /*
31 * Keypad Controller registers
32 */
33 #define KPC 0x0000 /* Keypad Control register */
34 #define KPDK 0x0008 /* Keypad Direct Key register */
35 #define KPREC 0x0010 /* Keypad Rotary Encoder register */
36 #define KPMK 0x0018 /* Keypad Matrix Key register */
37 #define KPAS 0x0020 /* Keypad Automatic Scan register */
38
39 /* Keypad Automatic Scan Multiple Key Presser register 0-3 */
40 #define KPASMKP0 0x0028
41 #define KPASMKP1 0x0030
42 #define KPASMKP2 0x0038
43 #define KPASMKP3 0x0040
44 #define KPKDI 0x0048
45
46 /* bit definitions */
47 #define KPC_MKRN(n) ((((n) - 1) & 0x7) << 26) /* matrix key row number */
48 #define KPC_MKCN(n) ((((n) - 1) & 0x7) << 23) /* matrix key column number */
49 #define KPC_DKN(n) ((((n) - 1) & 0x7) << 6) /* direct key number */
50
51 #define KPC_AS (0x1 << 30) /* Automatic Scan bit */
52 #define KPC_ASACT (0x1 << 29) /* Automatic Scan on Activity */
53 #define KPC_MI (0x1 << 22) /* Matrix interrupt bit */
54 #define KPC_IMKP (0x1 << 21) /* Ignore Multiple Key Press */
55
56 #define KPC_MS(n) (0x1 << (13 + (n))) /* Matrix scan line 'n' */
57 #define KPC_MS_ALL (0xff << 13)
58
59 #define KPC_ME (0x1 << 12) /* Matrix Keypad Enable */
60 #define KPC_MIE (0x1 << 11) /* Matrix Interrupt Enable */
61 #define KPC_DK_DEB_SEL (0x1 << 9) /* Direct Keypad Debounce Select */
62 #define KPC_DI (0x1 << 5) /* Direct key interrupt bit */
63 #define KPC_RE_ZERO_DEB (0x1 << 4) /* Rotary Encoder Zero Debounce */
64 #define KPC_REE1 (0x1 << 3) /* Rotary Encoder1 Enable */
65 #define KPC_REE0 (0x1 << 2) /* Rotary Encoder0 Enable */
66 #define KPC_DE (0x1 << 1) /* Direct Keypad Enable */
67 #define KPC_DIE (0x1 << 0) /* Direct Keypad interrupt Enable */
68
69 #define KPDK_DKP (0x1 << 31)
70 #define KPDK_DK(n) ((n) & 0xff)
71
72 #define KPREC_OF1 (0x1 << 31)
73 #define kPREC_UF1 (0x1 << 30)
74 #define KPREC_OF0 (0x1 << 15)
75 #define KPREC_UF0 (0x1 << 14)
76
77 #define KPREC_RECOUNT0(n) ((n) & 0xff)
78 #define KPREC_RECOUNT1(n) (((n) >> 16) & 0xff)
79
80 #define KPMK_MKP (0x1 << 31)
81 #define KPAS_SO (0x1 << 31)
82 #define KPASMKPx_SO (0x1 << 31)
83
84 #define KPAS_MUKP(n) (((n) >> 26) & 0x1f)
85 #define KPAS_RP(n) (((n) >> 4) & 0xf)
86 #define KPAS_CP(n) ((n) & 0xf)
87
88 #define KPASMKP_MKC_MASK (0xff)
89
90 #define keypad_readl(off) __raw_readl(keypad->mmio_base + (off))
91 #define keypad_writel(off, v) __raw_writel((v), keypad->mmio_base + (off))
92
93 #define MAX_MATRIX_KEY_NUM (MAX_MATRIX_KEY_ROWS * MAX_MATRIX_KEY_COLS)
94 #define MAX_KEYPAD_KEYS (MAX_MATRIX_KEY_NUM + MAX_DIRECT_KEY_NUM)
95
96 struct pxa27x_keypad {
97 const struct pxa27x_keypad_platform_data *pdata;
98
99 struct clk *clk;
100 struct input_dev *input_dev;
101 void __iomem *mmio_base;
102
103 int irq;
104
105 unsigned short keycodes[MAX_KEYPAD_KEYS];
106 int rotary_rel_code[2];
107
108 unsigned int row_shift;
109
110 /* state row bits of each column scan */
111 uint32_t matrix_key_state[MAX_MATRIX_KEY_COLS];
112 uint32_t direct_key_state;
113
114 unsigned int direct_key_mask;
115 };
116
117 #ifdef CONFIG_OF
118 static int pxa27x_keypad_matrix_key_parse_dt(struct pxa27x_keypad *keypad,
119 struct pxa27x_keypad_platform_data *pdata)
120 {
121 struct input_dev *input_dev = keypad->input_dev;
122 struct device *dev = input_dev->dev.parent;
123 u32 rows, cols;
124 int error;
125
126 error = matrix_keypad_parse_properties(dev, &rows, &cols);
127 if (error)
128 return error;
129
130 if (rows > MAX_MATRIX_KEY_ROWS || cols > MAX_MATRIX_KEY_COLS) {
131 dev_err(dev, "rows or cols exceeds maximum value\n");
132 return -EINVAL;
133 }
134
135 pdata->matrix_key_rows = rows;
136 pdata->matrix_key_cols = cols;
137
138 error = matrix_keypad_build_keymap(NULL, NULL,
139 pdata->matrix_key_rows,
140 pdata->matrix_key_cols,
141 keypad->keycodes, input_dev);
142 if (error)
143 return error;
144
145 return 0;
146 }
147
148 static int pxa27x_keypad_direct_key_parse_dt(struct pxa27x_keypad *keypad,
149 struct pxa27x_keypad_platform_data *pdata)
150 {
151 struct input_dev *input_dev = keypad->input_dev;
152 struct device *dev = input_dev->dev.parent;
153 struct device_node *np = dev->of_node;
154 const __be16 *prop;
155 unsigned short code;
156 unsigned int proplen, size;
157 int i;
158 int error;
159
160 error = of_property_read_u32(np, "marvell,direct-key-count",
161 &pdata->direct_key_num);
162 if (error) {
163 /*
164 * If do not have marvel,direct-key-count defined,
165 * it means direct key is not supported.
166 */
167 return error == -EINVAL ? 0 : error;
168 }
169
170 error = of_property_read_u32(np, "marvell,direct-key-mask",
171 &pdata->direct_key_mask);
172 if (error) {
173 if (error != -EINVAL)
174 return error;
175
176 /*
177 * If marvell,direct-key-mask is not defined, driver will use
178 * default value. Default value is set when configure the keypad.
179 */
180 pdata->direct_key_mask = 0;
181 }
182
183 pdata->direct_key_low_active = of_property_read_bool(np,
184 "marvell,direct-key-low-active");
185
186 prop = of_get_property(np, "marvell,direct-key-map", &proplen);
187 if (!prop)
188 return -EINVAL;
189
190 if (proplen % sizeof(u16))
191 return -EINVAL;
192
193 size = proplen / sizeof(u16);
194
195 /* Only MAX_DIRECT_KEY_NUM is accepted.*/
196 if (size > MAX_DIRECT_KEY_NUM)
197 return -EINVAL;
198
199 for (i = 0; i < size; i++) {
200 code = be16_to_cpup(prop + i);
201 keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = code;
202 __set_bit(code, input_dev->keybit);
203 }
204
205 return 0;
206 }
207
208 static int pxa27x_keypad_rotary_parse_dt(struct pxa27x_keypad *keypad,
209 struct pxa27x_keypad_platform_data *pdata)
210 {
211 const __be32 *prop;
212 int i, relkey_ret;
213 unsigned int code, proplen;
214 const char *rotaryname[2] = {
215 "marvell,rotary0", "marvell,rotary1"};
216 const char relkeyname[] = {"marvell,rotary-rel-key"};
217 struct input_dev *input_dev = keypad->input_dev;
218 struct device *dev = input_dev->dev.parent;
219 struct device_node *np = dev->of_node;
220
221 relkey_ret = of_property_read_u32(np, relkeyname, &code);
222 /* if can read correct rotary key-code, we do not need this. */
223 if (relkey_ret == 0) {
224 unsigned short relcode;
225
226 /* rotary0 taks lower half, rotary1 taks upper half. */
227 relcode = code & 0xffff;
228 pdata->rotary0_rel_code = (code & 0xffff);
229 __set_bit(relcode, input_dev->relbit);
230
231 relcode = code >> 16;
232 pdata->rotary1_rel_code = relcode;
233 __set_bit(relcode, input_dev->relbit);
234 }
235
236 for (i = 0; i < 2; i++) {
237 prop = of_get_property(np, rotaryname[i], &proplen);
238 /*
239 * If the prop is not set, it means keypad does not need
240 * initialize the rotaryX.
241 */
242 if (!prop)
243 continue;
244
245 code = be32_to_cpup(prop);
246 /*
247 * Not all up/down key code are valid.
248 * Now we depends on direct-rel-code.
249 */
250 if ((!(code & 0xffff) || !(code >> 16)) && relkey_ret) {
251 return relkey_ret;
252 } else {
253 unsigned int n = MAX_MATRIX_KEY_NUM + (i << 1);
254 unsigned short keycode;
255
256 keycode = code & 0xffff;
257 keypad->keycodes[n] = keycode;
258 __set_bit(keycode, input_dev->keybit);
259
260 keycode = code >> 16;
261 keypad->keycodes[n + 1] = keycode;
262 __set_bit(keycode, input_dev->keybit);
263
264 if (i == 0)
265 pdata->rotary0_rel_code = -1;
266 else
267 pdata->rotary1_rel_code = -1;
268 }
269 if (i == 0)
270 pdata->enable_rotary0 = 1;
271 else
272 pdata->enable_rotary1 = 1;
273 }
274
275 keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
276 keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
277
278 return 0;
279 }
280
281 static int pxa27x_keypad_build_keycode_from_dt(struct pxa27x_keypad *keypad)
282 {
283 struct input_dev *input_dev = keypad->input_dev;
284 struct device *dev = input_dev->dev.parent;
285 struct device_node *np = dev->of_node;
286 struct pxa27x_keypad_platform_data *pdata;
287 int error;
288
289 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
290 if (!pdata) {
291 dev_err(dev, "failed to allocate memory for pdata\n");
292 return -ENOMEM;
293 }
294
295 error = pxa27x_keypad_matrix_key_parse_dt(keypad, pdata);
296 if (error) {
297 dev_err(dev, "failed to parse matrix key\n");
298 return error;
299 }
300
301 error = pxa27x_keypad_direct_key_parse_dt(keypad, pdata);
302 if (error) {
303 dev_err(dev, "failed to parse direct key\n");
304 return error;
305 }
306
307 error = pxa27x_keypad_rotary_parse_dt(keypad, pdata);
308 if (error) {
309 dev_err(dev, "failed to parse rotary key\n");
310 return error;
311 }
312
313 error = of_property_read_u32(np, "marvell,debounce-interval",
314 &pdata->debounce_interval);
315 if (error) {
316 dev_err(dev, "failed to parse debounce-interval\n");
317 return error;
318 }
319
320 /*
321 * The keycodes may not only includes matrix key but also the direct
322 * key or rotary key.
323 */
324 input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
325
326 keypad->pdata = pdata;
327 return 0;
328 }
329
330 #else
331
332 static int pxa27x_keypad_build_keycode_from_dt(struct pxa27x_keypad *keypad)
333 {
334 dev_info(keypad->input_dev->dev.parent, "missing platform data\n");
335
336 return -EINVAL;
337 }
338
339 #endif
340
341 static int pxa27x_keypad_build_keycode(struct pxa27x_keypad *keypad)
342 {
343 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
344 struct input_dev *input_dev = keypad->input_dev;
345 unsigned short keycode;
346 int i;
347 int error;
348
349 error = matrix_keypad_build_keymap(pdata->matrix_keymap_data, NULL,
350 pdata->matrix_key_rows,
351 pdata->matrix_key_cols,
352 keypad->keycodes, input_dev);
353 if (error)
354 return error;
355
356 /*
357 * The keycodes may not only include matrix keys but also the direct
358 * or rotary keys.
359 */
360 input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
361
362 /* For direct keys. */
363 for (i = 0; i < pdata->direct_key_num; i++) {
364 keycode = pdata->direct_key_map[i];
365 keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = keycode;
366 __set_bit(keycode, input_dev->keybit);
367 }
368
369 if (pdata->enable_rotary0) {
370 if (pdata->rotary0_up_key && pdata->rotary0_down_key) {
371 keycode = pdata->rotary0_up_key;
372 keypad->keycodes[MAX_MATRIX_KEY_NUM + 0] = keycode;
373 __set_bit(keycode, input_dev->keybit);
374
375 keycode = pdata->rotary0_down_key;
376 keypad->keycodes[MAX_MATRIX_KEY_NUM + 1] = keycode;
377 __set_bit(keycode, input_dev->keybit);
378
379 keypad->rotary_rel_code[0] = -1;
380 } else {
381 keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
382 __set_bit(pdata->rotary0_rel_code, input_dev->relbit);
383 }
384 }
385
386 if (pdata->enable_rotary1) {
387 if (pdata->rotary1_up_key && pdata->rotary1_down_key) {
388 keycode = pdata->rotary1_up_key;
389 keypad->keycodes[MAX_MATRIX_KEY_NUM + 2] = keycode;
390 __set_bit(keycode, input_dev->keybit);
391
392 keycode = pdata->rotary1_down_key;
393 keypad->keycodes[MAX_MATRIX_KEY_NUM + 3] = keycode;
394 __set_bit(keycode, input_dev->keybit);
395
396 keypad->rotary_rel_code[1] = -1;
397 } else {
398 keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
399 __set_bit(pdata->rotary1_rel_code, input_dev->relbit);
400 }
401 }
402
403 __clear_bit(KEY_RESERVED, input_dev->keybit);
404
405 return 0;
406 }
407
408 static void pxa27x_keypad_scan_matrix(struct pxa27x_keypad *keypad)
409 {
410 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
411 struct input_dev *input_dev = keypad->input_dev;
412 int row, col, num_keys_pressed = 0;
413 uint32_t new_state[MAX_MATRIX_KEY_COLS];
414 uint32_t kpas = keypad_readl(KPAS);
415
416 num_keys_pressed = KPAS_MUKP(kpas);
417
418 memset(new_state, 0, sizeof(new_state));
419
420 if (num_keys_pressed == 0)
421 goto scan;
422
423 if (num_keys_pressed == 1) {
424 col = KPAS_CP(kpas);
425 row = KPAS_RP(kpas);
426
427 /* if invalid row/col, treat as no key pressed */
428 if (col >= pdata->matrix_key_cols ||
429 row >= pdata->matrix_key_rows)
430 goto scan;
431
432 new_state[col] = (1 << row);
433 goto scan;
434 }
435
436 if (num_keys_pressed > 1) {
437 uint32_t kpasmkp0 = keypad_readl(KPASMKP0);
438 uint32_t kpasmkp1 = keypad_readl(KPASMKP1);
439 uint32_t kpasmkp2 = keypad_readl(KPASMKP2);
440 uint32_t kpasmkp3 = keypad_readl(KPASMKP3);
441
442 new_state[0] = kpasmkp0 & KPASMKP_MKC_MASK;
443 new_state[1] = (kpasmkp0 >> 16) & KPASMKP_MKC_MASK;
444 new_state[2] = kpasmkp1 & KPASMKP_MKC_MASK;
445 new_state[3] = (kpasmkp1 >> 16) & KPASMKP_MKC_MASK;
446 new_state[4] = kpasmkp2 & KPASMKP_MKC_MASK;
447 new_state[5] = (kpasmkp2 >> 16) & KPASMKP_MKC_MASK;
448 new_state[6] = kpasmkp3 & KPASMKP_MKC_MASK;
449 new_state[7] = (kpasmkp3 >> 16) & KPASMKP_MKC_MASK;
450 }
451 scan:
452 for (col = 0; col < pdata->matrix_key_cols; col++) {
453 uint32_t bits_changed;
454 int code;
455
456 bits_changed = keypad->matrix_key_state[col] ^ new_state[col];
457 if (bits_changed == 0)
458 continue;
459
460 for (row = 0; row < pdata->matrix_key_rows; row++) {
461 if ((bits_changed & (1 << row)) == 0)
462 continue;
463
464 code = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
465
466 input_event(input_dev, EV_MSC, MSC_SCAN, code);
467 input_report_key(input_dev, keypad->keycodes[code],
468 new_state[col] & (1 << row));
469 }
470 }
471 input_sync(input_dev);
472 memcpy(keypad->matrix_key_state, new_state, sizeof(new_state));
473 }
474
475 #define DEFAULT_KPREC (0x007f007f)
476
477 static inline int rotary_delta(uint32_t kprec)
478 {
479 if (kprec & KPREC_OF0)
480 return (kprec & 0xff) + 0x7f;
481 else if (kprec & KPREC_UF0)
482 return (kprec & 0xff) - 0x7f - 0xff;
483 else
484 return (kprec & 0xff) - 0x7f;
485 }
486
487 static void report_rotary_event(struct pxa27x_keypad *keypad, int r, int delta)
488 {
489 struct input_dev *dev = keypad->input_dev;
490
491 if (delta == 0)
492 return;
493
494 if (keypad->rotary_rel_code[r] == -1) {
495 int code = MAX_MATRIX_KEY_NUM + 2 * r + (delta > 0 ? 0 : 1);
496 unsigned char keycode = keypad->keycodes[code];
497
498 /* simulate a press-n-release */
499 input_event(dev, EV_MSC, MSC_SCAN, code);
500 input_report_key(dev, keycode, 1);
501 input_sync(dev);
502 input_event(dev, EV_MSC, MSC_SCAN, code);
503 input_report_key(dev, keycode, 0);
504 input_sync(dev);
505 } else {
506 input_report_rel(dev, keypad->rotary_rel_code[r], delta);
507 input_sync(dev);
508 }
509 }
510
511 static void pxa27x_keypad_scan_rotary(struct pxa27x_keypad *keypad)
512 {
513 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
514 uint32_t kprec;
515
516 /* read and reset to default count value */
517 kprec = keypad_readl(KPREC);
518 keypad_writel(KPREC, DEFAULT_KPREC);
519
520 if (pdata->enable_rotary0)
521 report_rotary_event(keypad, 0, rotary_delta(kprec));
522
523 if (pdata->enable_rotary1)
524 report_rotary_event(keypad, 1, rotary_delta(kprec >> 16));
525 }
526
527 static void pxa27x_keypad_scan_direct(struct pxa27x_keypad *keypad)
528 {
529 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
530 struct input_dev *input_dev = keypad->input_dev;
531 unsigned int new_state;
532 uint32_t kpdk, bits_changed;
533 int i;
534
535 kpdk = keypad_readl(KPDK);
536
537 if (pdata->enable_rotary0 || pdata->enable_rotary1)
538 pxa27x_keypad_scan_rotary(keypad);
539
540 /*
541 * The KPDR_DK only output the key pin level, so it relates to board,
542 * and low level may be active.
543 */
544 if (pdata->direct_key_low_active)
545 new_state = ~KPDK_DK(kpdk) & keypad->direct_key_mask;
546 else
547 new_state = KPDK_DK(kpdk) & keypad->direct_key_mask;
548
549 bits_changed = keypad->direct_key_state ^ new_state;
550
551 if (bits_changed == 0)
552 return;
553
554 for (i = 0; i < pdata->direct_key_num; i++) {
555 if (bits_changed & (1 << i)) {
556 int code = MAX_MATRIX_KEY_NUM + i;
557
558 input_event(input_dev, EV_MSC, MSC_SCAN, code);
559 input_report_key(input_dev, keypad->keycodes[code],
560 new_state & (1 << i));
561 }
562 }
563 input_sync(input_dev);
564 keypad->direct_key_state = new_state;
565 }
566
567 static void clear_wakeup_event(struct pxa27x_keypad *keypad)
568 {
569 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
570
571 if (pdata->clear_wakeup_event)
572 (pdata->clear_wakeup_event)();
573 }
574
575 static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
576 {
577 struct pxa27x_keypad *keypad = dev_id;
578 unsigned long kpc = keypad_readl(KPC);
579
580 clear_wakeup_event(keypad);
581
582 if (kpc & KPC_DI)
583 pxa27x_keypad_scan_direct(keypad);
584
585 if (kpc & KPC_MI)
586 pxa27x_keypad_scan_matrix(keypad);
587
588 return IRQ_HANDLED;
589 }
590
591 static void pxa27x_keypad_config(struct pxa27x_keypad *keypad)
592 {
593 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
594 unsigned int mask = 0, direct_key_num = 0;
595 unsigned long kpc = 0;
596
597 /* clear pending interrupt bit */
598 keypad_readl(KPC);
599
600 /* enable matrix keys with automatic scan */
601 if (pdata->matrix_key_rows && pdata->matrix_key_cols) {
602 kpc |= KPC_ASACT | KPC_MIE | KPC_ME | KPC_MS_ALL;
603 kpc |= KPC_MKRN(pdata->matrix_key_rows) |
604 KPC_MKCN(pdata->matrix_key_cols);
605 }
606
607 /* enable rotary key, debounce interval same as direct keys */
608 if (pdata->enable_rotary0) {
609 mask |= 0x03;
610 direct_key_num = 2;
611 kpc |= KPC_REE0;
612 }
613
614 if (pdata->enable_rotary1) {
615 mask |= 0x0c;
616 direct_key_num = 4;
617 kpc |= KPC_REE1;
618 }
619
620 if (pdata->direct_key_num > direct_key_num)
621 direct_key_num = pdata->direct_key_num;
622
623 /*
624 * Direct keys usage may not start from KP_DKIN0, check the platfrom
625 * mask data to config the specific.
626 */
627 if (pdata->direct_key_mask)
628 keypad->direct_key_mask = pdata->direct_key_mask;
629 else
630 keypad->direct_key_mask = ((1 << direct_key_num) - 1) & ~mask;
631
632 /* enable direct key */
633 if (direct_key_num)
634 kpc |= KPC_DE | KPC_DIE | KPC_DKN(direct_key_num);
635
636 keypad_writel(KPC, kpc | KPC_RE_ZERO_DEB);
637 keypad_writel(KPREC, DEFAULT_KPREC);
638 keypad_writel(KPKDI, pdata->debounce_interval);
639 }
640
641 static int pxa27x_keypad_open(struct input_dev *dev)
642 {
643 struct pxa27x_keypad *keypad = input_get_drvdata(dev);
644 int ret;
645 /* Enable unit clock */
646 ret = clk_prepare_enable(keypad->clk);
647 if (ret)
648 return ret;
649
650 pxa27x_keypad_config(keypad);
651
652 return 0;
653 }
654
655 static void pxa27x_keypad_close(struct input_dev *dev)
656 {
657 struct pxa27x_keypad *keypad = input_get_drvdata(dev);
658
659 /* Disable clock unit */
660 clk_disable_unprepare(keypad->clk);
661 }
662
663 #ifdef CONFIG_PM_SLEEP
664 static int pxa27x_keypad_suspend(struct device *dev)
665 {
666 struct platform_device *pdev = to_platform_device(dev);
667 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
668
669 /*
670 * If the keypad is used a wake up source, clock can not be disabled.
671 * Or it can not detect the key pressing.
672 */
673 if (device_may_wakeup(&pdev->dev))
674 enable_irq_wake(keypad->irq);
675 else
676 clk_disable_unprepare(keypad->clk);
677
678 return 0;
679 }
680
681 static int pxa27x_keypad_resume(struct device *dev)
682 {
683 struct platform_device *pdev = to_platform_device(dev);
684 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
685 struct input_dev *input_dev = keypad->input_dev;
686 int ret = 0;
687
688 /*
689 * If the keypad is used as wake up source, the clock is not turned
690 * off. So do not need configure it again.
691 */
692 if (device_may_wakeup(&pdev->dev)) {
693 disable_irq_wake(keypad->irq);
694 } else {
695 mutex_lock(&input_dev->mutex);
696
697 if (input_dev->users) {
698 /* Enable unit clock */
699 ret = clk_prepare_enable(keypad->clk);
700 if (!ret)
701 pxa27x_keypad_config(keypad);
702 }
703
704 mutex_unlock(&input_dev->mutex);
705 }
706
707 return ret;
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 return -ENXIO;
732
733 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
734 if (res == NULL) {
735 dev_err(&pdev->dev, "failed to get I/O memory\n");
736 return -ENXIO;
737 }
738
739 keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad),
740 GFP_KERNEL);
741 if (!keypad)
742 return -ENOMEM;
743
744 input_dev = devm_input_allocate_device(&pdev->dev);
745 if (!input_dev)
746 return -ENOMEM;
747
748 keypad->pdata = pdata;
749 keypad->input_dev = input_dev;
750 keypad->irq = irq;
751
752 keypad->mmio_base = devm_ioremap_resource(&pdev->dev, res);
753 if (IS_ERR(keypad->mmio_base))
754 return PTR_ERR(keypad->mmio_base);
755
756 keypad->clk = devm_clk_get(&pdev->dev, NULL);
757 if (IS_ERR(keypad->clk)) {
758 dev_err(&pdev->dev, "failed to get keypad clock\n");
759 return PTR_ERR(keypad->clk);
760 }
761
762 input_dev->name = pdev->name;
763 input_dev->id.bustype = BUS_HOST;
764 input_dev->open = pxa27x_keypad_open;
765 input_dev->close = pxa27x_keypad_close;
766 input_dev->dev.parent = &pdev->dev;
767
768 input_dev->keycode = keypad->keycodes;
769 input_dev->keycodesize = sizeof(keypad->keycodes[0]);
770 input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
771
772 input_set_drvdata(input_dev, keypad);
773
774 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
775 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
776
777 if (pdata) {
778 error = pxa27x_keypad_build_keycode(keypad);
779 } else {
780 error = pxa27x_keypad_build_keycode_from_dt(keypad);
781 /*
782 * Data that we get from DT resides in dynamically
783 * allocated memory so we need to update our pdata
784 * pointer.
785 */
786 pdata = keypad->pdata;
787 }
788 if (error) {
789 dev_err(&pdev->dev, "failed to build keycode\n");
790 return error;
791 }
792
793 keypad->row_shift = get_count_order(pdata->matrix_key_cols);
794
795 if ((pdata->enable_rotary0 && keypad->rotary_rel_code[0] != -1) ||
796 (pdata->enable_rotary1 && keypad->rotary_rel_code[1] != -1)) {
797 input_dev->evbit[0] |= BIT_MASK(EV_REL);
798 }
799
800 error = devm_request_irq(&pdev->dev, irq, pxa27x_keypad_irq_handler,
801 0, pdev->name, keypad);
802 if (error) {
803 dev_err(&pdev->dev, "failed to request IRQ\n");
804 return error;
805 }
806
807 /* Register the input device */
808 error = input_register_device(input_dev);
809 if (error) {
810 dev_err(&pdev->dev, "failed to register input device\n");
811 return error;
812 }
813
814 platform_set_drvdata(pdev, keypad);
815 device_init_wakeup(&pdev->dev, 1);
816
817 return 0;
818 }
819
820 #ifdef CONFIG_OF
821 static const struct of_device_id pxa27x_keypad_dt_match[] = {
822 { .compatible = "marvell,pxa27x-keypad" },
823 {},
824 };
825 MODULE_DEVICE_TABLE(of, pxa27x_keypad_dt_match);
826 #endif
827
828 static struct platform_driver pxa27x_keypad_driver = {
829 .probe = pxa27x_keypad_probe,
830 .driver = {
831 .name = "pxa27x-keypad",
832 .of_match_table = of_match_ptr(pxa27x_keypad_dt_match),
833 .pm = &pxa27x_keypad_pm_ops,
834 },
835 };
836 module_platform_driver(pxa27x_keypad_driver);
837
838 MODULE_DESCRIPTION("PXA27x Keypad Controller Driver");
839 MODULE_LICENSE("GPL");
840 /* work with hotplug and coldplug */
841 MODULE_ALIAS("platform:pxa27x-keypad");
Linux with added FPC-III support