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@cam.org>.
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
29 #include <asm/mach/arch.h>
30 #include <asm/mach/map.h>
31
32 #include <mach/hardware.h>
33 #include <mach/pxa27x_keypad.h>
34
35 /*
36 * Keypad Controller registers
37 */
38 #define KPC 0x0000 /* Keypad Control register */
39 #define KPDK 0x0008 /* Keypad Direct Key register */
40 #define KPREC 0x0010 /* Keypad Rotary Encoder register */
41 #define KPMK 0x0018 /* Keypad Matrix Key register */
42 #define KPAS 0x0020 /* Keypad Automatic Scan register */
43
44 /* Keypad Automatic Scan Multiple Key Presser register 0-3 */
45 #define KPASMKP0 0x0028
46 #define KPASMKP1 0x0030
47 #define KPASMKP2 0x0038
48 #define KPASMKP3 0x0040
49 #define KPKDI 0x0048
50
51 /* bit definitions */
52 #define KPC_MKRN(n) ((((n) - 1) & 0x7) << 26) /* matrix key row number */
53 #define KPC_MKCN(n) ((((n) - 1) & 0x7) << 23) /* matrix key column number */
54 #define KPC_DKN(n) ((((n) - 1) & 0x7) << 6) /* direct key number */
55
56 #define KPC_AS (0x1 << 30) /* Automatic Scan bit */
57 #define KPC_ASACT (0x1 << 29) /* Automatic Scan on Activity */
58 #define KPC_MI (0x1 << 22) /* Matrix interrupt bit */
59 #define KPC_IMKP (0x1 << 21) /* Ignore Multiple Key Press */
60
61 #define KPC_MS(n) (0x1 << (13 + (n))) /* Matrix scan line 'n' */
62 #define KPC_MS_ALL (0xff << 13)
63
64 #define KPC_ME (0x1 << 12) /* Matrix Keypad Enable */
65 #define KPC_MIE (0x1 << 11) /* Matrix Interrupt Enable */
66 #define KPC_DK_DEB_SEL (0x1 << 9) /* Direct Keypad Debounce Select */
67 #define KPC_DI (0x1 << 5) /* Direct key interrupt bit */
68 #define KPC_RE_ZERO_DEB (0x1 << 4) /* Rotary Encoder Zero Debounce */
69 #define KPC_REE1 (0x1 << 3) /* Rotary Encoder1 Enable */
70 #define KPC_REE0 (0x1 << 2) /* Rotary Encoder0 Enable */
71 #define KPC_DE (0x1 << 1) /* Direct Keypad Enable */
72 #define KPC_DIE (0x1 << 0) /* Direct Keypad interrupt Enable */
73
74 #define KPDK_DKP (0x1 << 31)
75 #define KPDK_DK(n) ((n) & 0xff)
76
77 #define KPREC_OF1 (0x1 << 31)
78 #define kPREC_UF1 (0x1 << 30)
79 #define KPREC_OF0 (0x1 << 15)
80 #define KPREC_UF0 (0x1 << 14)
81
82 #define KPREC_RECOUNT0(n) ((n) & 0xff)
83 #define KPREC_RECOUNT1(n) (((n) >> 16) & 0xff)
84
85 #define KPMK_MKP (0x1 << 31)
86 #define KPAS_SO (0x1 << 31)
87 #define KPASMKPx_SO (0x1 << 31)
88
89 #define KPAS_MUKP(n) (((n) >> 26) & 0x1f)
90 #define KPAS_RP(n) (((n) >> 4) & 0xf)
91 #define KPAS_CP(n) ((n) & 0xf)
92
93 #define KPASMKP_MKC_MASK (0xff)
94
95 #define keypad_readl(off) __raw_readl(keypad->mmio_base + (off))
96 #define keypad_writel(off, v) __raw_writel((v), keypad->mmio_base + (off))
97
98 #define MAX_MATRIX_KEY_NUM (8 * 8)
99
100 struct pxa27x_keypad {
101 struct pxa27x_keypad_platform_data *pdata;
102
103 struct clk *clk;
104 struct input_dev *input_dev;
105 void __iomem *mmio_base;
106
107 int irq;
108
109 /* matrix key code map */
110 unsigned int matrix_keycodes[MAX_MATRIX_KEY_NUM];
111
112 /* state row bits of each column scan */
113 uint32_t matrix_key_state[MAX_MATRIX_KEY_COLS];
114 uint32_t direct_key_state;
115
116 unsigned int direct_key_mask;
117
118 int rotary_rel_code[2];
119 int rotary_up_key[2];
120 int rotary_down_key[2];
121 };
122
123 static void pxa27x_keypad_build_keycode(struct pxa27x_keypad *keypad)
124 {
125 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
126 struct input_dev *input_dev = keypad->input_dev;
127 unsigned int *key;
128 int i;
129
130 key = &pdata->matrix_key_map[0];
131 for (i = 0; i < pdata->matrix_key_map_size; i++, key++) {
132 int row = ((*key) >> 28) & 0xf;
133 int col = ((*key) >> 24) & 0xf;
134 int code = (*key) & 0xffffff;
135
136 keypad->matrix_keycodes[(row << 3) + col] = code;
137 set_bit(code, input_dev->keybit);
138 }
139
140 for (i = 0; i < pdata->direct_key_num; i++)
141 set_bit(pdata->direct_key_map[i], input_dev->keybit);
142
143 keypad->rotary_up_key[0] = pdata->rotary0_up_key;
144 keypad->rotary_up_key[1] = pdata->rotary1_up_key;
145 keypad->rotary_down_key[0] = pdata->rotary0_down_key;
146 keypad->rotary_down_key[1] = pdata->rotary1_down_key;
147 keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
148 keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
149
150 if (pdata->enable_rotary0) {
151 if (pdata->rotary0_up_key && pdata->rotary0_down_key) {
152 set_bit(pdata->rotary0_up_key, input_dev->keybit);
153 set_bit(pdata->rotary0_down_key, input_dev->keybit);
154 } else
155 set_bit(pdata->rotary0_rel_code, input_dev->relbit);
156 }
157
158 if (pdata->enable_rotary1) {
159 if (pdata->rotary1_up_key && pdata->rotary1_down_key) {
160 set_bit(pdata->rotary1_up_key, input_dev->keybit);
161 set_bit(pdata->rotary1_down_key, input_dev->keybit);
162 } else
163 set_bit(pdata->rotary1_rel_code, input_dev->relbit);
164 }
165 }
166
167 static inline unsigned int lookup_matrix_keycode(
168 struct pxa27x_keypad *keypad, int row, int col)
169 {
170 return keypad->matrix_keycodes[(row << 3) + col];
171 }
172
173 static void pxa27x_keypad_scan_matrix(struct pxa27x_keypad *keypad)
174 {
175 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
176 int row, col, num_keys_pressed = 0;
177 uint32_t new_state[MAX_MATRIX_KEY_COLS];
178 uint32_t kpas = keypad_readl(KPAS);
179
180 num_keys_pressed = KPAS_MUKP(kpas);
181
182 memset(new_state, 0, sizeof(new_state));
183
184 if (num_keys_pressed == 0)
185 goto scan;
186
187 if (num_keys_pressed == 1) {
188 col = KPAS_CP(kpas);
189 row = KPAS_RP(kpas);
190
191 /* if invalid row/col, treat as no key pressed */
192 if (col >= pdata->matrix_key_cols ||
193 row >= pdata->matrix_key_rows)
194 goto scan;
195
196 new_state[col] = (1 << row);
197 goto scan;
198 }
199
200 if (num_keys_pressed > 1) {
201 uint32_t kpasmkp0 = keypad_readl(KPASMKP0);
202 uint32_t kpasmkp1 = keypad_readl(KPASMKP1);
203 uint32_t kpasmkp2 = keypad_readl(KPASMKP2);
204 uint32_t kpasmkp3 = keypad_readl(KPASMKP3);
205
206 new_state[0] = kpasmkp0 & KPASMKP_MKC_MASK;
207 new_state[1] = (kpasmkp0 >> 16) & KPASMKP_MKC_MASK;
208 new_state[2] = kpasmkp1 & KPASMKP_MKC_MASK;
209 new_state[3] = (kpasmkp1 >> 16) & KPASMKP_MKC_MASK;
210 new_state[4] = kpasmkp2 & KPASMKP_MKC_MASK;
211 new_state[5] = (kpasmkp2 >> 16) & KPASMKP_MKC_MASK;
212 new_state[6] = kpasmkp3 & KPASMKP_MKC_MASK;
213 new_state[7] = (kpasmkp3 >> 16) & KPASMKP_MKC_MASK;
214 }
215 scan:
216 for (col = 0; col < pdata->matrix_key_cols; col++) {
217 uint32_t bits_changed;
218
219 bits_changed = keypad->matrix_key_state[col] ^ new_state[col];
220 if (bits_changed == 0)
221 continue;
222
223 for (row = 0; row < pdata->matrix_key_rows; row++) {
224 if ((bits_changed & (1 << row)) == 0)
225 continue;
226
227 input_report_key(keypad->input_dev,
228 lookup_matrix_keycode(keypad, row, col),
229 new_state[col] & (1 << row));
230 }
231 }
232 input_sync(keypad->input_dev);
233 memcpy(keypad->matrix_key_state, new_state, sizeof(new_state));
234 }
235
236 #define DEFAULT_KPREC (0x007f007f)
237
238 static inline int rotary_delta(uint32_t kprec)
239 {
240 if (kprec & KPREC_OF0)
241 return (kprec & 0xff) + 0x7f;
242 else if (kprec & KPREC_UF0)
243 return (kprec & 0xff) - 0x7f - 0xff;
244 else
245 return (kprec & 0xff) - 0x7f;
246 }
247
248 static void report_rotary_event(struct pxa27x_keypad *keypad, int r, int delta)
249 {
250 struct input_dev *dev = keypad->input_dev;
251
252 if (delta == 0)
253 return;
254
255 if (keypad->rotary_up_key[r] && keypad->rotary_down_key[r]) {
256 int keycode = (delta > 0) ? keypad->rotary_up_key[r] :
257 keypad->rotary_down_key[r];
258
259 /* simulate a press-n-release */
260 input_report_key(dev, keycode, 1);
261 input_sync(dev);
262 input_report_key(dev, keycode, 0);
263 input_sync(dev);
264 } else {
265 input_report_rel(dev, keypad->rotary_rel_code[r], delta);
266 input_sync(dev);
267 }
268 }
269
270 static void pxa27x_keypad_scan_rotary(struct pxa27x_keypad *keypad)
271 {
272 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
273 uint32_t kprec;
274
275 /* read and reset to default count value */
276 kprec = keypad_readl(KPREC);
277 keypad_writel(KPREC, DEFAULT_KPREC);
278
279 if (pdata->enable_rotary0)
280 report_rotary_event(keypad, 0, rotary_delta(kprec));
281
282 if (pdata->enable_rotary1)
283 report_rotary_event(keypad, 1, rotary_delta(kprec >> 16));
284 }
285
286 static void pxa27x_keypad_scan_direct(struct pxa27x_keypad *keypad)
287 {
288 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
289 unsigned int new_state;
290 uint32_t kpdk, bits_changed;
291 int i;
292
293 kpdk = keypad_readl(KPDK);
294
295 if (pdata->enable_rotary0 || pdata->enable_rotary1)
296 pxa27x_keypad_scan_rotary(keypad);
297
298 if (pdata->direct_key_map == NULL)
299 return;
300
301 new_state = KPDK_DK(kpdk) & keypad->direct_key_mask;
302 bits_changed = keypad->direct_key_state ^ new_state;
303
304 if (bits_changed == 0)
305 return;
306
307 for (i = 0; i < pdata->direct_key_num; i++) {
308 if (bits_changed & (1 << i))
309 input_report_key(keypad->input_dev,
310 pdata->direct_key_map[i],
311 (new_state & (1 << i)));
312 }
313 input_sync(keypad->input_dev);
314 keypad->direct_key_state = new_state;
315 }
316
317 static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
318 {
319 struct pxa27x_keypad *keypad = dev_id;
320 unsigned long kpc = keypad_readl(KPC);
321
322 if (kpc & KPC_DI)
323 pxa27x_keypad_scan_direct(keypad);
324
325 if (kpc & KPC_MI)
326 pxa27x_keypad_scan_matrix(keypad);
327
328 return IRQ_HANDLED;
329 }
330
331 static void pxa27x_keypad_config(struct pxa27x_keypad *keypad)
332 {
333 struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
334 unsigned int mask = 0, direct_key_num = 0;
335 unsigned long kpc = 0;
336
337 /* enable matrix keys with automatic scan */
338 if (pdata->matrix_key_rows && pdata->matrix_key_cols) {
339 kpc |= KPC_ASACT | KPC_MIE | KPC_ME | KPC_MS_ALL;
340 kpc |= KPC_MKRN(pdata->matrix_key_rows) |
341 KPC_MKCN(pdata->matrix_key_cols);
342 }
343
344 /* enable rotary key, debounce interval same as direct keys */
345 if (pdata->enable_rotary0) {
346 mask |= 0x03;
347 direct_key_num = 2;
348 kpc |= KPC_REE0;
349 }
350
351 if (pdata->enable_rotary1) {
352 mask |= 0x0c;
353 direct_key_num = 4;
354 kpc |= KPC_REE1;
355 }
356
357 if (pdata->direct_key_num > direct_key_num)
358 direct_key_num = pdata->direct_key_num;
359
360 keypad->direct_key_mask = ((2 << direct_key_num) - 1) & ~mask;
361
362 /* enable direct key */
363 if (direct_key_num)
364 kpc |= KPC_DE | KPC_DIE | KPC_DKN(direct_key_num);
365
366 keypad_writel(KPC, kpc | KPC_RE_ZERO_DEB);
367 keypad_writel(KPREC, DEFAULT_KPREC);
368 keypad_writel(KPKDI, pdata->debounce_interval);
369 }
370
371 static int pxa27x_keypad_open(struct input_dev *dev)
372 {
373 struct pxa27x_keypad *keypad = input_get_drvdata(dev);
374
375 /* Enable unit clock */
376 clk_enable(keypad->clk);
377 pxa27x_keypad_config(keypad);
378
379 return 0;
380 }
381
382 static void pxa27x_keypad_close(struct input_dev *dev)
383 {
384 struct pxa27x_keypad *keypad = input_get_drvdata(dev);
385
386 /* Disable clock unit */
387 clk_disable(keypad->clk);
388 }
389
390 #ifdef CONFIG_PM
391 static int pxa27x_keypad_suspend(struct platform_device *pdev, pm_message_t state)
392 {
393 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
394
395 clk_disable(keypad->clk);
396
397 if (device_may_wakeup(&pdev->dev))
398 enable_irq_wake(keypad->irq);
399
400 return 0;
401 }
402
403 static int pxa27x_keypad_resume(struct platform_device *pdev)
404 {
405 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
406 struct input_dev *input_dev = keypad->input_dev;
407
408 if (device_may_wakeup(&pdev->dev))
409 disable_irq_wake(keypad->irq);
410
411 mutex_lock(&input_dev->mutex);
412
413 if (input_dev->users) {
414 /* Enable unit clock */
415 clk_enable(keypad->clk);
416 pxa27x_keypad_config(keypad);
417 }
418
419 mutex_unlock(&input_dev->mutex);
420
421 return 0;
422 }
423 #else
424 #define pxa27x_keypad_suspend NULL
425 #define pxa27x_keypad_resume NULL
426 #endif
427
428 #define res_size(res) ((res)->end - (res)->start + 1)
429
430 static int __devinit pxa27x_keypad_probe(struct platform_device *pdev)
431 {
432 struct pxa27x_keypad *keypad;
433 struct input_dev *input_dev;
434 struct resource *res;
435 int irq, error;
436
437 keypad = kzalloc(sizeof(struct pxa27x_keypad), GFP_KERNEL);
438 if (keypad == NULL) {
439 dev_err(&pdev->dev, "failed to allocate driver data\n");
440 return -ENOMEM;
441 }
442
443 keypad->pdata = pdev->dev.platform_data;
444 if (keypad->pdata == NULL) {
445 dev_err(&pdev->dev, "no platform data defined\n");
446 error = -EINVAL;
447 goto failed_free;
448 }
449
450 irq = platform_get_irq(pdev, 0);
451 if (irq < 0) {
452 dev_err(&pdev->dev, "failed to get keypad irq\n");
453 error = -ENXIO;
454 goto failed_free;
455 }
456
457 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
458 if (res == NULL) {
459 dev_err(&pdev->dev, "failed to get I/O memory\n");
460 error = -ENXIO;
461 goto failed_free;
462 }
463
464 res = request_mem_region(res->start, res_size(res), pdev->name);
465 if (res == NULL) {
466 dev_err(&pdev->dev, "failed to request I/O memory\n");
467 error = -EBUSY;
468 goto failed_free;
469 }
470
471 keypad->mmio_base = ioremap(res->start, res_size(res));
472 if (keypad->mmio_base == NULL) {
473 dev_err(&pdev->dev, "failed to remap I/O memory\n");
474 error = -ENXIO;
475 goto failed_free_mem;
476 }
477
478 keypad->clk = clk_get(&pdev->dev, NULL);
479 if (IS_ERR(keypad->clk)) {
480 dev_err(&pdev->dev, "failed to get keypad clock\n");
481 error = PTR_ERR(keypad->clk);
482 goto failed_free_io;
483 }
484
485 /* Create and register the input driver. */
486 input_dev = input_allocate_device();
487 if (!input_dev) {
488 dev_err(&pdev->dev, "failed to allocate input device\n");
489 error = -ENOMEM;
490 goto failed_put_clk;
491 }
492
493 input_dev->name = pdev->name;
494 input_dev->id.bustype = BUS_HOST;
495 input_dev->open = pxa27x_keypad_open;
496 input_dev->close = pxa27x_keypad_close;
497 input_dev->dev.parent = &pdev->dev;
498
499 keypad->input_dev = input_dev;
500 input_set_drvdata(input_dev, keypad);
501
502 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
503 if ((keypad->pdata->enable_rotary0 &&
504 keypad->pdata->rotary0_rel_code) ||
505 (keypad->pdata->enable_rotary1 &&
506 keypad->pdata->rotary1_rel_code)) {
507 input_dev->evbit[0] |= BIT_MASK(EV_REL);
508 }
509
510 pxa27x_keypad_build_keycode(keypad);
511 platform_set_drvdata(pdev, keypad);
512
513 error = request_irq(irq, pxa27x_keypad_irq_handler, IRQF_DISABLED,
514 pdev->name, keypad);
515 if (error) {
516 dev_err(&pdev->dev, "failed to request IRQ\n");
517 goto failed_free_dev;
518 }
519
520 keypad->irq = irq;
521
522 /* Register the input device */
523 error = input_register_device(input_dev);
524 if (error) {
525 dev_err(&pdev->dev, "failed to register input device\n");
526 goto failed_free_irq;
527 }
528
529 device_init_wakeup(&pdev->dev, 1);
530
531 return 0;
532
533 failed_free_irq:
534 free_irq(irq, pdev);
535 platform_set_drvdata(pdev, NULL);
536 failed_free_dev:
537 input_free_device(input_dev);
538 failed_put_clk:
539 clk_put(keypad->clk);
540 failed_free_io:
541 iounmap(keypad->mmio_base);
542 failed_free_mem:
543 release_mem_region(res->start, res_size(res));
544 failed_free:
545 kfree(keypad);
546 return error;
547 }
548
549 static int __devexit pxa27x_keypad_remove(struct platform_device *pdev)
550 {
551 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
552 struct resource *res;
553
554 free_irq(keypad->irq, pdev);
555
556 clk_disable(keypad->clk);
557 clk_put(keypad->clk);
558
559 input_unregister_device(keypad->input_dev);
560 input_free_device(keypad->input_dev);
561
562 iounmap(keypad->mmio_base);
563
564 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
565 release_mem_region(res->start, res_size(res));
566
567 platform_set_drvdata(pdev, NULL);
568 kfree(keypad);
569 return 0;
570 }
571
572 /* work with hotplug and coldplug */
573 MODULE_ALIAS("platform:pxa27x-keypad");
574
575 static struct platform_driver pxa27x_keypad_driver = {
576 .probe = pxa27x_keypad_probe,
577 .remove = __devexit_p(pxa27x_keypad_remove),
578 .suspend = pxa27x_keypad_suspend,
579 .resume = pxa27x_keypad_resume,
580 .driver = {
581 .name = "pxa27x-keypad",
582 .owner = THIS_MODULE,
583 },
584 };
585
586 static int __init pxa27x_keypad_init(void)
587 {
588 return platform_driver_register(&pxa27x_keypad_driver);
589 }
590
591 static void __exit pxa27x_keypad_exit(void)
592 {
593 platform_driver_unregister(&pxa27x_keypad_driver);
594 }
595
596 module_init(pxa27x_keypad_init);
597 module_exit(pxa27x_keypad_exit);
598
599 MODULE_DESCRIPTION("PXA27x Keypad Controller Driver");
600 MODULE_LICENSE("GPL");
601
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