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[people/arne_f/kernel.git] / 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/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 <mach/pxa27x_keypad.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 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 static void pxa27x_keypad_build_keycode(struct pxa27x_keypad *keypad)
122 {
123 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
124 struct input_dev *input_dev = keypad->input_dev;
125 unsigned short keycode;
126 int i;
127
128 for (i = 0; i < pdata->matrix_key_map_size; i++) {
129 unsigned int key = pdata->matrix_key_map[i];
130 unsigned int row = KEY_ROW(key);
131 unsigned int col = KEY_COL(key);
132 unsigned int scancode = MATRIX_SCAN_CODE(row, col,
133 MATRIX_ROW_SHIFT);
134
135 keycode = KEY_VAL(key);
136 keypad->keycodes[scancode] = keycode;
137 __set_bit(keycode, input_dev->keybit);
138 }
139
140 for (i = 0; i < pdata->direct_key_num; i++) {
141 keycode = pdata->direct_key_map[i];
142 keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = keycode;
143 __set_bit(keycode, input_dev->keybit);
144 }
145
146 if (pdata->enable_rotary0) {
147 if (pdata->rotary0_up_key && pdata->rotary0_down_key) {
148 keycode = pdata->rotary0_up_key;
149 keypad->keycodes[MAX_MATRIX_KEY_NUM + 0] = keycode;
150 __set_bit(keycode, input_dev->keybit);
151
152 keycode = pdata->rotary0_down_key;
153 keypad->keycodes[MAX_MATRIX_KEY_NUM + 1] = keycode;
154 __set_bit(keycode, input_dev->keybit);
155
156 keypad->rotary_rel_code[0] = -1;
157 } else {
158 keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
159 __set_bit(pdata->rotary0_rel_code, input_dev->relbit);
160 }
161 }
162
163 if (pdata->enable_rotary1) {
164 if (pdata->rotary1_up_key && pdata->rotary1_down_key) {
165 keycode = pdata->rotary1_up_key;
166 keypad->keycodes[MAX_MATRIX_KEY_NUM + 2] = keycode;
167 __set_bit(keycode, input_dev->keybit);
168
169 keycode = pdata->rotary1_down_key;
170 keypad->keycodes[MAX_MATRIX_KEY_NUM + 3] = keycode;
171 __set_bit(keycode, input_dev->keybit);
172
173 keypad->rotary_rel_code[1] = -1;
174 } else {
175 keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
176 __set_bit(pdata->rotary1_rel_code, input_dev->relbit);
177 }
178 }
179
180 __clear_bit(KEY_RESERVED, input_dev->keybit);
181 }
182
183 static void pxa27x_keypad_scan_matrix(struct pxa27x_keypad *keypad)
184 {
185 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
186 struct input_dev *input_dev = keypad->input_dev;
187 int row, col, num_keys_pressed = 0;
188 uint32_t new_state[MAX_MATRIX_KEY_COLS];
189 uint32_t kpas = keypad_readl(KPAS);
190
191 num_keys_pressed = KPAS_MUKP(kpas);
192
193 memset(new_state, 0, sizeof(new_state));
194
195 if (num_keys_pressed == 0)
196 goto scan;
197
198 if (num_keys_pressed == 1) {
199 col = KPAS_CP(kpas);
200 row = KPAS_RP(kpas);
201
202 /* if invalid row/col, treat as no key pressed */
203 if (col >= pdata->matrix_key_cols ||
204 row >= pdata->matrix_key_rows)
205 goto scan;
206
207 new_state[col] = (1 << row);
208 goto scan;
209 }
210
211 if (num_keys_pressed > 1) {
212 uint32_t kpasmkp0 = keypad_readl(KPASMKP0);
213 uint32_t kpasmkp1 = keypad_readl(KPASMKP1);
214 uint32_t kpasmkp2 = keypad_readl(KPASMKP2);
215 uint32_t kpasmkp3 = keypad_readl(KPASMKP3);
216
217 new_state[0] = kpasmkp0 & KPASMKP_MKC_MASK;
218 new_state[1] = (kpasmkp0 >> 16) & KPASMKP_MKC_MASK;
219 new_state[2] = kpasmkp1 & KPASMKP_MKC_MASK;
220 new_state[3] = (kpasmkp1 >> 16) & KPASMKP_MKC_MASK;
221 new_state[4] = kpasmkp2 & KPASMKP_MKC_MASK;
222 new_state[5] = (kpasmkp2 >> 16) & KPASMKP_MKC_MASK;
223 new_state[6] = kpasmkp3 & KPASMKP_MKC_MASK;
224 new_state[7] = (kpasmkp3 >> 16) & KPASMKP_MKC_MASK;
225 }
226 scan:
227 for (col = 0; col < pdata->matrix_key_cols; col++) {
228 uint32_t bits_changed;
229 int code;
230
231 bits_changed = keypad->matrix_key_state[col] ^ new_state[col];
232 if (bits_changed == 0)
233 continue;
234
235 for (row = 0; row < pdata->matrix_key_rows; row++) {
236 if ((bits_changed & (1 << row)) == 0)
237 continue;
238
239 code = MATRIX_SCAN_CODE(row, col, MATRIX_ROW_SHIFT);
240 input_event(input_dev, EV_MSC, MSC_SCAN, code);
241 input_report_key(input_dev, keypad->keycodes[code],
242 new_state[col] & (1 << row));
243 }
244 }
245 input_sync(input_dev);
246 memcpy(keypad->matrix_key_state, new_state, sizeof(new_state));
247 }
248
249 #define DEFAULT_KPREC (0x007f007f)
250
251 static inline int rotary_delta(uint32_t kprec)
252 {
253 if (kprec & KPREC_OF0)
254 return (kprec & 0xff) + 0x7f;
255 else if (kprec & KPREC_UF0)
256 return (kprec & 0xff) - 0x7f - 0xff;
257 else
258 return (kprec & 0xff) - 0x7f;
259 }
260
261 static void report_rotary_event(struct pxa27x_keypad *keypad, int r, int delta)
262 {
263 struct input_dev *dev = keypad->input_dev;
264
265 if (delta == 0)
266 return;
267
268 if (keypad->rotary_rel_code[r] == -1) {
269 int code = MAX_MATRIX_KEY_NUM + 2 * r + (delta > 0 ? 0 : 1);
270 unsigned char keycode = keypad->keycodes[code];
271
272 /* simulate a press-n-release */
273 input_event(dev, EV_MSC, MSC_SCAN, code);
274 input_report_key(dev, keycode, 1);
275 input_sync(dev);
276 input_event(dev, EV_MSC, MSC_SCAN, code);
277 input_report_key(dev, keycode, 0);
278 input_sync(dev);
279 } else {
280 input_report_rel(dev, keypad->rotary_rel_code[r], delta);
281 input_sync(dev);
282 }
283 }
284
285 static void pxa27x_keypad_scan_rotary(struct pxa27x_keypad *keypad)
286 {
287 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
288 uint32_t kprec;
289
290 /* read and reset to default count value */
291 kprec = keypad_readl(KPREC);
292 keypad_writel(KPREC, DEFAULT_KPREC);
293
294 if (pdata->enable_rotary0)
295 report_rotary_event(keypad, 0, rotary_delta(kprec));
296
297 if (pdata->enable_rotary1)
298 report_rotary_event(keypad, 1, rotary_delta(kprec >> 16));
299 }
300
301 static void pxa27x_keypad_scan_direct(struct pxa27x_keypad *keypad)
302 {
303 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
304 struct input_dev *input_dev = keypad->input_dev;
305 unsigned int new_state;
306 uint32_t kpdk, bits_changed;
307 int i;
308
309 kpdk = keypad_readl(KPDK);
310
311 if (pdata->enable_rotary0 || pdata->enable_rotary1)
312 pxa27x_keypad_scan_rotary(keypad);
313
314 new_state = KPDK_DK(kpdk) & keypad->direct_key_mask;
315 bits_changed = keypad->direct_key_state ^ new_state;
316
317 if (bits_changed == 0)
318 return;
319
320 for (i = 0; i < pdata->direct_key_num; i++) {
321 if (bits_changed & (1 << i)) {
322 int code = MAX_MATRIX_KEY_NUM + i;
323
324 input_event(input_dev, EV_MSC, MSC_SCAN, code);
325 input_report_key(input_dev, keypad->keycodes[code],
326 new_state & (1 << i));
327 }
328 }
329 input_sync(input_dev);
330 keypad->direct_key_state = new_state;
331 }
332
333 static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
334 {
335 struct pxa27x_keypad *keypad = dev_id;
336 unsigned long kpc = keypad_readl(KPC);
337
338 if (kpc & KPC_DI)
339 pxa27x_keypad_scan_direct(keypad);
340
341 if (kpc & KPC_MI)
342 pxa27x_keypad_scan_matrix(keypad);
343
344 return IRQ_HANDLED;
345 }
346
347 static void pxa27x_keypad_config(struct pxa27x_keypad *keypad)
348 {
349 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
350 unsigned int mask = 0, direct_key_num = 0;
351 unsigned long kpc = 0;
352
353 /* enable matrix keys with automatic scan */
354 if (pdata->matrix_key_rows && pdata->matrix_key_cols) {
355 kpc |= KPC_ASACT | KPC_MIE | KPC_ME | KPC_MS_ALL;
356 kpc |= KPC_MKRN(pdata->matrix_key_rows) |
357 KPC_MKCN(pdata->matrix_key_cols);
358 }
359
360 /* enable rotary key, debounce interval same as direct keys */
361 if (pdata->enable_rotary0) {
362 mask |= 0x03;
363 direct_key_num = 2;
364 kpc |= KPC_REE0;
365 }
366
367 if (pdata->enable_rotary1) {
368 mask |= 0x0c;
369 direct_key_num = 4;
370 kpc |= KPC_REE1;
371 }
372
373 if (pdata->direct_key_num > direct_key_num)
374 direct_key_num = pdata->direct_key_num;
375
376 keypad->direct_key_mask = ((2 << direct_key_num) - 1) & ~mask;
377
378 /* enable direct key */
379 if (direct_key_num)
380 kpc |= KPC_DE | KPC_DIE | KPC_DKN(direct_key_num);
381
382 keypad_writel(KPC, kpc | KPC_RE_ZERO_DEB);
383 keypad_writel(KPREC, DEFAULT_KPREC);
384 keypad_writel(KPKDI, pdata->debounce_interval);
385 }
386
387 static int pxa27x_keypad_open(struct input_dev *dev)
388 {
389 struct pxa27x_keypad *keypad = input_get_drvdata(dev);
390
391 /* Enable unit clock */
392 clk_enable(keypad->clk);
393 pxa27x_keypad_config(keypad);
394
395 return 0;
396 }
397
398 static void pxa27x_keypad_close(struct input_dev *dev)
399 {
400 struct pxa27x_keypad *keypad = input_get_drvdata(dev);
401
402 /* Disable clock unit */
403 clk_disable(keypad->clk);
404 }
405
406 #ifdef CONFIG_PM
407 static int pxa27x_keypad_suspend(struct device *dev)
408 {
409 struct platform_device *pdev = to_platform_device(dev);
410 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
411
412 clk_disable(keypad->clk);
413
414 if (device_may_wakeup(&pdev->dev))
415 enable_irq_wake(keypad->irq);
416
417 return 0;
418 }
419
420 static int pxa27x_keypad_resume(struct device *dev)
421 {
422 struct platform_device *pdev = to_platform_device(dev);
423 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
424 struct input_dev *input_dev = keypad->input_dev;
425
426 if (device_may_wakeup(&pdev->dev))
427 disable_irq_wake(keypad->irq);
428
429 mutex_lock(&input_dev->mutex);
430
431 if (input_dev->users) {
432 /* Enable unit clock */
433 clk_enable(keypad->clk);
434 pxa27x_keypad_config(keypad);
435 }
436
437 mutex_unlock(&input_dev->mutex);
438
439 return 0;
440 }
441
442 static const struct dev_pm_ops pxa27x_keypad_pm_ops = {
443 .suspend = pxa27x_keypad_suspend,
444 .resume = pxa27x_keypad_resume,
445 };
446 #endif
447
448 static int __devinit pxa27x_keypad_probe(struct platform_device *pdev)
449 {
450 struct pxa27x_keypad_platform_data *pdata = pdev->dev.platform_data;
451 struct pxa27x_keypad *keypad;
452 struct input_dev *input_dev;
453 struct resource *res;
454 int irq, error;
455
456 if (pdata == NULL) {
457 dev_err(&pdev->dev, "no platform data defined\n");
458 return -EINVAL;
459 }
460
461 irq = platform_get_irq(pdev, 0);
462 if (irq < 0) {
463 dev_err(&pdev->dev, "failed to get keypad irq\n");
464 return -ENXIO;
465 }
466
467 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
468 if (res == NULL) {
469 dev_err(&pdev->dev, "failed to get I/O memory\n");
470 return -ENXIO;
471 }
472
473 keypad = kzalloc(sizeof(struct pxa27x_keypad), GFP_KERNEL);
474 input_dev = input_allocate_device();
475 if (!keypad || !input_dev) {
476 dev_err(&pdev->dev, "failed to allocate memory\n");
477 error = -ENOMEM;
478 goto failed_free;
479 }
480
481 keypad->pdata = pdata;
482 keypad->input_dev = input_dev;
483 keypad->irq = irq;
484
485 res = request_mem_region(res->start, resource_size(res), pdev->name);
486 if (res == NULL) {
487 dev_err(&pdev->dev, "failed to request I/O memory\n");
488 error = -EBUSY;
489 goto failed_free;
490 }
491
492 keypad->mmio_base = ioremap(res->start, resource_size(res));
493 if (keypad->mmio_base == NULL) {
494 dev_err(&pdev->dev, "failed to remap I/O memory\n");
495 error = -ENXIO;
496 goto failed_free_mem;
497 }
498
499 keypad->clk = clk_get(&pdev->dev, NULL);
500 if (IS_ERR(keypad->clk)) {
501 dev_err(&pdev->dev, "failed to get keypad clock\n");
502 error = PTR_ERR(keypad->clk);
503 goto failed_free_io;
504 }
505
506 input_dev->name = pdev->name;
507 input_dev->id.bustype = BUS_HOST;
508 input_dev->open = pxa27x_keypad_open;
509 input_dev->close = pxa27x_keypad_close;
510 input_dev->dev.parent = &pdev->dev;
511
512 input_dev->keycode = keypad->keycodes;
513 input_dev->keycodesize = sizeof(keypad->keycodes[0]);
514 input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
515
516 input_set_drvdata(input_dev, keypad);
517
518 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
519 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
520
521 pxa27x_keypad_build_keycode(keypad);
522
523 if ((pdata->enable_rotary0 && keypad->rotary_rel_code[0] != -1) ||
524 (pdata->enable_rotary1 && keypad->rotary_rel_code[1] != -1)) {
525 input_dev->evbit[0] |= BIT_MASK(EV_REL);
526 }
527
528 error = request_irq(irq, pxa27x_keypad_irq_handler, IRQF_DISABLED,
529 pdev->name, keypad);
530 if (error) {
531 dev_err(&pdev->dev, "failed to request IRQ\n");
532 goto failed_put_clk;
533 }
534
535 /* Register the input device */
536 error = input_register_device(input_dev);
537 if (error) {
538 dev_err(&pdev->dev, "failed to register input device\n");
539 goto failed_free_irq;
540 }
541
542 platform_set_drvdata(pdev, keypad);
543 device_init_wakeup(&pdev->dev, 1);
544
545 return 0;
546
547 failed_free_irq:
548 free_irq(irq, pdev);
549 failed_put_clk:
550 clk_put(keypad->clk);
551 failed_free_io:
552 iounmap(keypad->mmio_base);
553 failed_free_mem:
554 release_mem_region(res->start, resource_size(res));
555 failed_free:
556 input_free_device(input_dev);
557 kfree(keypad);
558 return error;
559 }
560
561 static int __devexit pxa27x_keypad_remove(struct platform_device *pdev)
562 {
563 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
564 struct resource *res;
565
566 free_irq(keypad->irq, pdev);
567 clk_put(keypad->clk);
568
569 input_unregister_device(keypad->input_dev);
570 input_free_device(keypad->input_dev);
571
572 iounmap(keypad->mmio_base);
573
574 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
575 release_mem_region(res->start, resource_size(res));
576
577 platform_set_drvdata(pdev, NULL);
578 kfree(keypad);
579
580 return 0;
581 }
582
583 /* work with hotplug and coldplug */
584 MODULE_ALIAS("platform:pxa27x-keypad");
585
586 static struct platform_driver pxa27x_keypad_driver = {
587 .probe = pxa27x_keypad_probe,
588 .remove = __devexit_p(pxa27x_keypad_remove),
589 .driver = {
590 .name = "pxa27x-keypad",
591 .owner = THIS_MODULE,
592 #ifdef CONFIG_PM
593 .pm = &pxa27x_keypad_pm_ops,
594 #endif
595 },
596 };
597
598 static int __init pxa27x_keypad_init(void)
599 {
600 return platform_driver_register(&pxa27x_keypad_driver);
601 }
602
603 static void __exit pxa27x_keypad_exit(void)
604 {
605 platform_driver_unregister(&pxa27x_keypad_driver);
606 }
607
608 module_init(pxa27x_keypad_init);
609 module_exit(pxa27x_keypad_exit);
610
611 MODULE_DESCRIPTION("PXA27x Keypad Controller Driver");
612 MODULE_LICENSE("GPL");
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