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Linux/drivers/input/keyboard/pxa27x_keypad.c

  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_of_params(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 debpunce-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 
648         /* Enable unit clock */
649         clk_prepare_enable(keypad->clk);
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 
687         /*
688          * If the keypad is used as wake up source, the clock is not turned
689          * off. So do not need configure it again.
690          */
691         if (device_may_wakeup(&pdev->dev)) {
692                 disable_irq_wake(keypad->irq);
693         } else {
694                 mutex_lock(&input_dev->mutex);
695 
696                 if (input_dev->users) {
697                         /* Enable unit clock */
698                         clk_prepare_enable(keypad->clk);
699                         pxa27x_keypad_config(keypad);
700                 }
701 
702                 mutex_unlock(&input_dev->mutex);
703         }
704 
705         return 0;
706 }
707 #endif
708 
709 static SIMPLE_DEV_PM_OPS(pxa27x_keypad_pm_ops,
710                          pxa27x_keypad_suspend, pxa27x_keypad_resume);
711 
712 
713 static int pxa27x_keypad_probe(struct platform_device *pdev)
714 {
715         const struct pxa27x_keypad_platform_data *pdata =
716                                         dev_get_platdata(&pdev->dev);
717         struct device_node *np = pdev->dev.of_node;
718         struct pxa27x_keypad *keypad;
719         struct input_dev *input_dev;
720         struct resource *res;
721         int irq, error;
722 
723         /* Driver need build keycode from device tree or pdata */
724         if (!np && !pdata)
725                 return -EINVAL;
726 
727         irq = platform_get_irq(pdev, 0);
728         if (irq < 0) {
729                 dev_err(&pdev->dev, "failed to get keypad irq\n");
730                 return -ENXIO;
731         }
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");
842 

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