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ARM: kvm: rename cpu_reset to avoid name clash
[linux-2.6.git] / drivers / input / keyboard / samsung-keypad.c
blobac43a486c77536c6267aa33f766b104d698784d7
1 /*
2 * Samsung keypad driver
3 *
4 * Copyright (C) 2010 Samsung Electronics Co.Ltd
5 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
6 * Author: Donghwa Lee <dh09.lee@samsung.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 */
13
14 #include <linux/clk.h>
15 #include <linux/delay.h>
16 #include <linux/err.h>
17 #include <linux/init.h>
18 #include <linux/input.h>
19 #include <linux/interrupt.h>
20 #include <linux/io.h>
21 #include <linux/module.h>
22 #include <linux/platform_device.h>
23 #include <linux/pm.h>
24 #include <linux/pm_runtime.h>
25 #include <linux/slab.h>
26 #include <linux/of.h>
27 #include <linux/sched.h>
28 #include <linux/input/samsung-keypad.h>
29
30 #define SAMSUNG_KEYIFCON 0x00
31 #define SAMSUNG_KEYIFSTSCLR 0x04
32 #define SAMSUNG_KEYIFCOL 0x08
33 #define SAMSUNG_KEYIFROW 0x0c
34 #define SAMSUNG_KEYIFFC 0x10
35
36 /* SAMSUNG_KEYIFCON */
37 #define SAMSUNG_KEYIFCON_INT_F_EN (1 << 0)
38 #define SAMSUNG_KEYIFCON_INT_R_EN (1 << 1)
39 #define SAMSUNG_KEYIFCON_DF_EN (1 << 2)
40 #define SAMSUNG_KEYIFCON_FC_EN (1 << 3)
41 #define SAMSUNG_KEYIFCON_WAKEUPEN (1 << 4)
42
43 /* SAMSUNG_KEYIFSTSCLR */
44 #define SAMSUNG_KEYIFSTSCLR_P_INT_MASK (0xff << 0)
45 #define SAMSUNG_KEYIFSTSCLR_R_INT_MASK (0xff << 8)
46 #define SAMSUNG_KEYIFSTSCLR_R_INT_OFFSET 8
47 #define S5PV210_KEYIFSTSCLR_P_INT_MASK (0x3fff << 0)
48 #define S5PV210_KEYIFSTSCLR_R_INT_MASK (0x3fff << 16)
49 #define S5PV210_KEYIFSTSCLR_R_INT_OFFSET 16
50
51 /* SAMSUNG_KEYIFCOL */
52 #define SAMSUNG_KEYIFCOL_MASK (0xff << 0)
53 #define S5PV210_KEYIFCOLEN_MASK (0xff << 8)
54
55 /* SAMSUNG_KEYIFROW */
56 #define SAMSUNG_KEYIFROW_MASK (0xff << 0)
57 #define S5PV210_KEYIFROW_MASK (0x3fff << 0)
58
59 /* SAMSUNG_KEYIFFC */
60 #define SAMSUNG_KEYIFFC_MASK (0x3ff << 0)
61
62 enum samsung_keypad_type {
63 KEYPAD_TYPE_SAMSUNG,
64 KEYPAD_TYPE_S5PV210,
65 };
66
67 struct samsung_keypad {
68 struct input_dev *input_dev;
69 struct platform_device *pdev;
70 struct clk *clk;
71 void __iomem *base;
72 wait_queue_head_t wait;
73 bool stopped;
74 bool wake_enabled;
75 int irq;
76 enum samsung_keypad_type type;
77 unsigned int row_shift;
78 unsigned int rows;
79 unsigned int cols;
80 unsigned int row_state[SAMSUNG_MAX_COLS];
81 unsigned short keycodes[];
82 };
83
84 static void samsung_keypad_scan(struct samsung_keypad *keypad,
85 unsigned int *row_state)
86 {
87 unsigned int col;
88 unsigned int val;
89
90 for (col = 0; col < keypad->cols; col++) {
91 if (keypad->type == KEYPAD_TYPE_S5PV210) {
92 val = S5PV210_KEYIFCOLEN_MASK;
93 val &= ~(1 << col) << 8;
94 } else {
95 val = SAMSUNG_KEYIFCOL_MASK;
96 val &= ~(1 << col);
97 }
98
99 writel(val, keypad->base + SAMSUNG_KEYIFCOL);
100 mdelay(1);
101
102 val = readl(keypad->base + SAMSUNG_KEYIFROW);
103 row_state[col] = ~val & ((1 << keypad->rows) - 1);
104 }
105
106 /* KEYIFCOL reg clear */
107 writel(0, keypad->base + SAMSUNG_KEYIFCOL);
108 }
109
110 static bool samsung_keypad_report(struct samsung_keypad *keypad,
111 unsigned int *row_state)
112 {
113 struct input_dev *input_dev = keypad->input_dev;
114 unsigned int changed;
115 unsigned int pressed;
116 unsigned int key_down = 0;
117 unsigned int val;
118 unsigned int col, row;
119
120 for (col = 0; col < keypad->cols; col++) {
121 changed = row_state[col] ^ keypad->row_state[col];
122 key_down |= row_state[col];
123 if (!changed)
124 continue;
125
126 for (row = 0; row < keypad->rows; row++) {
127 if (!(changed & (1 << row)))
128 continue;
129
130 pressed = row_state[col] & (1 << row);
131
132 dev_dbg(&keypad->input_dev->dev,
133 "key %s, row: %d, col: %d\n",
134 pressed ? "pressed" : "released", row, col);
135
136 val = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
137
138 input_event(input_dev, EV_MSC, MSC_SCAN, val);
139 input_report_key(input_dev,
140 keypad->keycodes[val], pressed);
141 }
142 input_sync(keypad->input_dev);
143 }
144
145 memcpy(keypad->row_state, row_state, sizeof(keypad->row_state));
146
147 return key_down;
148 }
149
150 static irqreturn_t samsung_keypad_irq(int irq, void *dev_id)
151 {
152 struct samsung_keypad *keypad = dev_id;
153 unsigned int row_state[SAMSUNG_MAX_COLS];
154 unsigned int val;
155 bool key_down;
156
157 pm_runtime_get_sync(&keypad->pdev->dev);
158
159 do {
160 val = readl(keypad->base + SAMSUNG_KEYIFSTSCLR);
161 /* Clear interrupt. */
162 writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
163
164 samsung_keypad_scan(keypad, row_state);
165
166 key_down = samsung_keypad_report(keypad, row_state);
167 if (key_down)
168 wait_event_timeout(keypad->wait, keypad->stopped,
169 msecs_to_jiffies(50));
170
171 } while (key_down && !keypad->stopped);
172
173 pm_runtime_put(&keypad->pdev->dev);
174
175 return IRQ_HANDLED;
176 }
177
178 static void samsung_keypad_start(struct samsung_keypad *keypad)
179 {
180 unsigned int val;
181
182 pm_runtime_get_sync(&keypad->pdev->dev);
183
184 /* Tell IRQ thread that it may poll the device. */
185 keypad->stopped = false;
186
187 clk_enable(keypad->clk);
188
189 /* Enable interrupt bits. */
190 val = readl(keypad->base + SAMSUNG_KEYIFCON);
191 val |= SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN;
192 writel(val, keypad->base + SAMSUNG_KEYIFCON);
193
194 /* KEYIFCOL reg clear. */
195 writel(0, keypad->base + SAMSUNG_KEYIFCOL);
196
197 pm_runtime_put(&keypad->pdev->dev);
198 }
199
200 static void samsung_keypad_stop(struct samsung_keypad *keypad)
201 {
202 unsigned int val;
203
204 pm_runtime_get_sync(&keypad->pdev->dev);
205
206 /* Signal IRQ thread to stop polling and disable the handler. */
207 keypad->stopped = true;
208 wake_up(&keypad->wait);
209 disable_irq(keypad->irq);
210
211 /* Clear interrupt. */
212 writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
213
214 /* Disable interrupt bits. */
215 val = readl(keypad->base + SAMSUNG_KEYIFCON);
216 val &= ~(SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN);
217 writel(val, keypad->base + SAMSUNG_KEYIFCON);
218
219 clk_disable(keypad->clk);
220
221 /*
222 * Now that chip should not generate interrupts we can safely
223 * re-enable the handler.
224 */
225 enable_irq(keypad->irq);
226
227 pm_runtime_put(&keypad->pdev->dev);
228 }
229
230 static int samsung_keypad_open(struct input_dev *input_dev)
231 {
232 struct samsung_keypad *keypad = input_get_drvdata(input_dev);
233
234 samsung_keypad_start(keypad);
235
236 return 0;
237 }
238
239 static void samsung_keypad_close(struct input_dev *input_dev)
240 {
241 struct samsung_keypad *keypad = input_get_drvdata(input_dev);
242
243 samsung_keypad_stop(keypad);
244 }
245
246 #ifdef CONFIG_OF
247 static struct samsung_keypad_platdata *samsung_keypad_parse_dt(
248 struct device *dev)
249 {
250 struct samsung_keypad_platdata *pdata;
251 struct matrix_keymap_data *keymap_data;
252 uint32_t *keymap, num_rows = 0, num_cols = 0;
253 struct device_node *np = dev->of_node, *key_np;
254 unsigned int key_count;
255
256 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
257 if (!pdata) {
258 dev_err(dev, "could not allocate memory for platform data\n");
259 return NULL;
260 }
261
262 of_property_read_u32(np, "samsung,keypad-num-rows", &num_rows);
263 of_property_read_u32(np, "samsung,keypad-num-columns", &num_cols);
264 if (!num_rows || !num_cols) {
265 dev_err(dev, "number of keypad rows/columns not specified\n");
266 return NULL;
267 }
268 pdata->rows = num_rows;
269 pdata->cols = num_cols;
270
271 keymap_data = devm_kzalloc(dev, sizeof(*keymap_data), GFP_KERNEL);
272 if (!keymap_data) {
273 dev_err(dev, "could not allocate memory for keymap data\n");
274 return NULL;
275 }
276 pdata->keymap_data = keymap_data;
277
278 key_count = of_get_child_count(np);
279 keymap_data->keymap_size = key_count;
280 keymap = devm_kzalloc(dev, sizeof(uint32_t) * key_count, GFP_KERNEL);
281 if (!keymap) {
282 dev_err(dev, "could not allocate memory for keymap\n");
283 return NULL;
284 }
285 keymap_data->keymap = keymap;
286
287 for_each_child_of_node(np, key_np) {
288 u32 row, col, key_code;
289 of_property_read_u32(key_np, "keypad,row", &row);
290 of_property_read_u32(key_np, "keypad,column", &col);
291 of_property_read_u32(key_np, "linux,code", &key_code);
292 *keymap++ = KEY(row, col, key_code);
293 }
294
295 if (of_get_property(np, "linux,input-no-autorepeat", NULL))
296 pdata->no_autorepeat = true;
297 if (of_get_property(np, "linux,input-wakeup", NULL))
298 pdata->wakeup = true;
299
300 return pdata;
301 }
302 #else
303 static
304 struct samsung_keypad_platdata *samsung_keypad_parse_dt(struct device *dev)
305 {
306 return NULL;
307 }
308 #endif
309
310 static int samsung_keypad_probe(struct platform_device *pdev)
311 {
312 const struct samsung_keypad_platdata *pdata;
313 const struct matrix_keymap_data *keymap_data;
314 struct samsung_keypad *keypad;
315 struct resource *res;
316 struct input_dev *input_dev;
317 unsigned int row_shift;
318 unsigned int keymap_size;
319 int error;
320
321 if (pdev->dev.of_node)
322 pdata = samsung_keypad_parse_dt(&pdev->dev);
323 else
324 pdata = pdev->dev.platform_data;
325 if (!pdata) {
326 dev_err(&pdev->dev, "no platform data defined\n");
327 return -EINVAL;
328 }
329
330 keymap_data = pdata->keymap_data;
331 if (!keymap_data) {
332 dev_err(&pdev->dev, "no keymap data defined\n");
333 return -EINVAL;
334 }
335
336 if (!pdata->rows || pdata->rows > SAMSUNG_MAX_ROWS)
337 return -EINVAL;
338
339 if (!pdata->cols || pdata->cols > SAMSUNG_MAX_COLS)
340 return -EINVAL;
341
342 /* initialize the gpio */
343 if (pdata->cfg_gpio)
344 pdata->cfg_gpio(pdata->rows, pdata->cols);
345
346 row_shift = get_count_order(pdata->cols);
347 keymap_size = (pdata->rows << row_shift) * sizeof(keypad->keycodes[0]);
348
349 keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad) + keymap_size,
350 GFP_KERNEL);
351 input_dev = devm_input_allocate_device(&pdev->dev);
352 if (!keypad || !input_dev)
353 return -ENOMEM;
354
355 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
356 if (!res)
357 return -ENODEV;
358
359 keypad->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
360 if (!keypad->base)
361 return -EBUSY;
362
363 keypad->clk = devm_clk_get(&pdev->dev, "keypad");
364 if (IS_ERR(keypad->clk)) {
365 dev_err(&pdev->dev, "failed to get keypad clk\n");
366 return PTR_ERR(keypad->clk);
367 }
368
369 error = clk_prepare(keypad->clk);
370 if (error) {
371 dev_err(&pdev->dev, "keypad clock prepare failed\n");
372 return error;
373 }
374
375 keypad->input_dev = input_dev;
376 keypad->pdev = pdev;
377 keypad->row_shift = row_shift;
378 keypad->rows = pdata->rows;
379 keypad->cols = pdata->cols;
380 keypad->stopped = true;
381 init_waitqueue_head(&keypad->wait);
382
383 if (pdev->dev.of_node)
384 keypad->type = of_device_is_compatible(pdev->dev.of_node,
385 "samsung,s5pv210-keypad");
386 else
387 keypad->type = platform_get_device_id(pdev)->driver_data;
388
389 input_dev->name = pdev->name;
390 input_dev->id.bustype = BUS_HOST;
391 input_dev->dev.parent = &pdev->dev;
392
393 input_dev->open = samsung_keypad_open;
394 input_dev->close = samsung_keypad_close;
395
396 error = matrix_keypad_build_keymap(keymap_data, NULL,
397 pdata->rows, pdata->cols,
398 keypad->keycodes, input_dev);
399 if (error) {
400 dev_err(&pdev->dev, "failed to build keymap\n");
401 goto err_unprepare_clk;
402 }
403
404 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
405 if (!pdata->no_autorepeat)
406 __set_bit(EV_REP, input_dev->evbit);
407
408 input_set_drvdata(input_dev, keypad);
409
410 keypad->irq = platform_get_irq(pdev, 0);
411 if (keypad->irq < 0) {
412 error = keypad->irq;
413 goto err_unprepare_clk;
414 }
415
416 error = devm_request_threaded_irq(&pdev->dev, keypad->irq, NULL,
417 samsung_keypad_irq, IRQF_ONESHOT,
418 dev_name(&pdev->dev), keypad);
419 if (error) {
420 dev_err(&pdev->dev, "failed to register keypad interrupt\n");
421 goto err_unprepare_clk;
422 }
423
424 device_init_wakeup(&pdev->dev, pdata->wakeup);
425 platform_set_drvdata(pdev, keypad);
426 pm_runtime_enable(&pdev->dev);
427
428 error = input_register_device(keypad->input_dev);
429 if (error)
430 goto err_disable_runtime_pm;
431
432 if (pdev->dev.of_node) {
433 devm_kfree(&pdev->dev, (void *)pdata->keymap_data->keymap);
434 devm_kfree(&pdev->dev, (void *)pdata->keymap_data);
435 devm_kfree(&pdev->dev, (void *)pdata);
436 }
437 return 0;
438
439 err_disable_runtime_pm:
440 pm_runtime_disable(&pdev->dev);
441 device_init_wakeup(&pdev->dev, 0);
442 err_unprepare_clk:
443 clk_unprepare(keypad->clk);
444 return error;
445 }
446
447 static int samsung_keypad_remove(struct platform_device *pdev)
448 {
449 struct samsung_keypad *keypad = platform_get_drvdata(pdev);
450
451 pm_runtime_disable(&pdev->dev);
452 device_init_wakeup(&pdev->dev, 0);
453
454 input_unregister_device(keypad->input_dev);
455
456 clk_unprepare(keypad->clk);
457
458 return 0;
459 }
460
461 #ifdef CONFIG_PM_RUNTIME
462 static int samsung_keypad_runtime_suspend(struct device *dev)
463 {
464 struct platform_device *pdev = to_platform_device(dev);
465 struct samsung_keypad *keypad = platform_get_drvdata(pdev);
466 unsigned int val;
467 int error;
468
469 if (keypad->stopped)
470 return 0;
471
472 /* This may fail on some SoCs due to lack of controller support */
473 error = enable_irq_wake(keypad->irq);
474 if (!error)
475 keypad->wake_enabled = true;
476
477 val = readl(keypad->base + SAMSUNG_KEYIFCON);
478 val |= SAMSUNG_KEYIFCON_WAKEUPEN;
479 writel(val, keypad->base + SAMSUNG_KEYIFCON);
480
481 clk_disable(keypad->clk);
482
483 return 0;
484 }
485
486 static int samsung_keypad_runtime_resume(struct device *dev)
487 {
488 struct platform_device *pdev = to_platform_device(dev);
489 struct samsung_keypad *keypad = platform_get_drvdata(pdev);
490 unsigned int val;
491
492 if (keypad->stopped)
493 return 0;
494
495 clk_enable(keypad->clk);
496
497 val = readl(keypad->base + SAMSUNG_KEYIFCON);
498 val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
499 writel(val, keypad->base + SAMSUNG_KEYIFCON);
500
501 if (keypad->wake_enabled)
502 disable_irq_wake(keypad->irq);
503
504 return 0;
505 }
506 #endif
507
508 #ifdef CONFIG_PM_SLEEP
509 static void samsung_keypad_toggle_wakeup(struct samsung_keypad *keypad,
510 bool enable)
511 {
512 unsigned int val;
513
514 clk_enable(keypad->clk);
515
516 val = readl(keypad->base + SAMSUNG_KEYIFCON);
517 if (enable) {
518 val |= SAMSUNG_KEYIFCON_WAKEUPEN;
519 if (device_may_wakeup(&keypad->pdev->dev))
520 enable_irq_wake(keypad->irq);
521 } else {
522 val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
523 if (device_may_wakeup(&keypad->pdev->dev))
524 disable_irq_wake(keypad->irq);
525 }
526 writel(val, keypad->base + SAMSUNG_KEYIFCON);
527
528 clk_disable(keypad->clk);
529 }
530
531 static int samsung_keypad_suspend(struct device *dev)
532 {
533 struct platform_device *pdev = to_platform_device(dev);
534 struct samsung_keypad *keypad = platform_get_drvdata(pdev);
535 struct input_dev *input_dev = keypad->input_dev;
536
537 mutex_lock(&input_dev->mutex);
538
539 if (input_dev->users)
540 samsung_keypad_stop(keypad);
541
542 samsung_keypad_toggle_wakeup(keypad, true);
543
544 mutex_unlock(&input_dev->mutex);
545
546 return 0;
547 }
548
549 static int samsung_keypad_resume(struct device *dev)
550 {
551 struct platform_device *pdev = to_platform_device(dev);
552 struct samsung_keypad *keypad = platform_get_drvdata(pdev);
553 struct input_dev *input_dev = keypad->input_dev;
554
555 mutex_lock(&input_dev->mutex);
556
557 samsung_keypad_toggle_wakeup(keypad, false);
558
559 if (input_dev->users)
560 samsung_keypad_start(keypad);
561
562 mutex_unlock(&input_dev->mutex);
563
564 return 0;
565 }
566 #endif
567
568 static const struct dev_pm_ops samsung_keypad_pm_ops = {
569 SET_SYSTEM_SLEEP_PM_OPS(samsung_keypad_suspend, samsung_keypad_resume)
570 SET_RUNTIME_PM_OPS(samsung_keypad_runtime_suspend,
571 samsung_keypad_runtime_resume, NULL)
572 };
573
574 #ifdef CONFIG_OF
575 static const struct of_device_id samsung_keypad_dt_match[] = {
576 { .compatible = "samsung,s3c6410-keypad" },
577 { .compatible = "samsung,s5pv210-keypad" },
578 {},
579 };
580 MODULE_DEVICE_TABLE(of, samsung_keypad_dt_match);
581 #endif
582
583 static struct platform_device_id samsung_keypad_driver_ids[] = {
584 {
585 .name = "samsung-keypad",
586 .driver_data = KEYPAD_TYPE_SAMSUNG,
587 }, {
588 .name = "s5pv210-keypad",
589 .driver_data = KEYPAD_TYPE_S5PV210,
590 },
591 { },
592 };
593 MODULE_DEVICE_TABLE(platform, samsung_keypad_driver_ids);
594
595 static struct platform_driver samsung_keypad_driver = {
596 .probe = samsung_keypad_probe,
597 .remove = samsung_keypad_remove,
598 .driver = {
599 .name = "samsung-keypad",
600 .owner = THIS_MODULE,
601 .of_match_table = of_match_ptr(samsung_keypad_dt_match),
602 .pm = &samsung_keypad_pm_ops,
603 },
604 .id_table = samsung_keypad_driver_ids,
605 };
606 module_platform_driver(samsung_keypad_driver);
607
608 MODULE_DESCRIPTION("Samsung keypad driver");
609 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
610 MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
611 MODULE_LICENSE("GPL");
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