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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/input.h>
18#include <linux/interrupt.h>
19#include <linux/io.h>
20#include <linux/module.h>
21#include <linux/platform_device.h>
22#include <linux/pm.h>
23#include <linux/pm_runtime.h>
24#include <linux/slab.h>
25#include <linux/of.h>
26#include <linux/sched.h>
27#include <linux/input/samsung-keypad.h>
28
29#define SAMSUNG_KEYIFCON 0x00
30#define SAMSUNG_KEYIFSTSCLR 0x04
31#define SAMSUNG_KEYIFCOL 0x08
32#define SAMSUNG_KEYIFROW 0x0c
33#define SAMSUNG_KEYIFFC 0x10
34
35/* SAMSUNG_KEYIFCON */
36#define SAMSUNG_KEYIFCON_INT_F_EN (1 << 0)
37#define SAMSUNG_KEYIFCON_INT_R_EN (1 << 1)
38#define SAMSUNG_KEYIFCON_DF_EN (1 << 2)
39#define SAMSUNG_KEYIFCON_FC_EN (1 << 3)
40#define SAMSUNG_KEYIFCON_WAKEUPEN (1 << 4)
41
42/* SAMSUNG_KEYIFSTSCLR */
43#define SAMSUNG_KEYIFSTSCLR_P_INT_MASK (0xff << 0)
44#define SAMSUNG_KEYIFSTSCLR_R_INT_MASK (0xff << 8)
45#define SAMSUNG_KEYIFSTSCLR_R_INT_OFFSET 8
46#define S5PV210_KEYIFSTSCLR_P_INT_MASK (0x3fff << 0)
47#define S5PV210_KEYIFSTSCLR_R_INT_MASK (0x3fff << 16)
48#define S5PV210_KEYIFSTSCLR_R_INT_OFFSET 16
49
50/* SAMSUNG_KEYIFCOL */
51#define SAMSUNG_KEYIFCOL_MASK (0xff << 0)
52#define S5PV210_KEYIFCOLEN_MASK (0xff << 8)
53
54/* SAMSUNG_KEYIFROW */
55#define SAMSUNG_KEYIFROW_MASK (0xff << 0)
56#define S5PV210_KEYIFROW_MASK (0x3fff << 0)
57
58/* SAMSUNG_KEYIFFC */
59#define SAMSUNG_KEYIFFC_MASK (0x3ff << 0)
60
61enum samsung_keypad_type {
62 KEYPAD_TYPE_SAMSUNG,
63 KEYPAD_TYPE_S5PV210,
64};
65
66struct samsung_keypad {
67 struct input_dev *input_dev;
68 struct platform_device *pdev;
69 struct clk *clk;
70 void __iomem *base;
71 wait_queue_head_t wait;
72 bool stopped;
73 bool wake_enabled;
74 int irq;
75 enum samsung_keypad_type type;
76 unsigned int row_shift;
77 unsigned int rows;
78 unsigned int cols;
79 unsigned int row_state[SAMSUNG_MAX_COLS];
80 unsigned short keycodes[];
81};
82
83static void samsung_keypad_scan(struct samsung_keypad *keypad,
84 unsigned int *row_state)
85{
86 unsigned int col;
87 unsigned int val;
88
89 for (col = 0; col < keypad->cols; col++) {
90 if (keypad->type == KEYPAD_TYPE_S5PV210) {
91 val = S5PV210_KEYIFCOLEN_MASK;
92 val &= ~(1 << col) << 8;
93 } else {
94 val = SAMSUNG_KEYIFCOL_MASK;
95 val &= ~(1 << col);
96 }
97
98 writel(val, keypad->base + SAMSUNG_KEYIFCOL);
99 mdelay(1);
100
101 val = readl(keypad->base + SAMSUNG_KEYIFROW);
102 row_state[col] = ~val & ((1 << keypad->rows) - 1);
103 }
104
105 /* KEYIFCOL reg clear */
106 writel(0, keypad->base + SAMSUNG_KEYIFCOL);
107}
108
109static bool samsung_keypad_report(struct samsung_keypad *keypad,
110 unsigned int *row_state)
111{
112 struct input_dev *input_dev = keypad->input_dev;
113 unsigned int changed;
114 unsigned int pressed;
115 unsigned int key_down = 0;
116 unsigned int val;
117 unsigned int col, row;
118
119 for (col = 0; col < keypad->cols; col++) {
120 changed = row_state[col] ^ keypad->row_state[col];
121 key_down |= row_state[col];
122 if (!changed)
123 continue;
124
125 for (row = 0; row < keypad->rows; row++) {
126 if (!(changed & (1 << row)))
127 continue;
128
129 pressed = row_state[col] & (1 << row);
130
131 dev_dbg(&keypad->input_dev->dev,
132 "key %s, row: %d, col: %d\n",
133 pressed ? "pressed" : "released", row, col);
134
135 val = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
136
137 input_event(input_dev, EV_MSC, MSC_SCAN, val);
138 input_report_key(input_dev,
139 keypad->keycodes[val], pressed);
140 }
141 input_sync(keypad->input_dev);
142 }
143
144 memcpy(keypad->row_state, row_state, sizeof(keypad->row_state));
145
146 return key_down;
147}
148
149static irqreturn_t samsung_keypad_irq(int irq, void *dev_id)
150{
151 struct samsung_keypad *keypad = dev_id;
152 unsigned int row_state[SAMSUNG_MAX_COLS];
153 unsigned int val;
154 bool key_down;
155
156 pm_runtime_get_sync(&keypad->pdev->dev);
157
158 do {
159 val = readl(keypad->base + SAMSUNG_KEYIFSTSCLR);
160 /* Clear interrupt. */
161 writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
162
163 samsung_keypad_scan(keypad, row_state);
164
165 key_down = samsung_keypad_report(keypad, row_state);
166 if (key_down)
167 wait_event_timeout(keypad->wait, keypad->stopped,
168 msecs_to_jiffies(50));
169
170 } while (key_down && !keypad->stopped);
171
172 pm_runtime_put(&keypad->pdev->dev);
173
174 return IRQ_HANDLED;
175}
176
177static void samsung_keypad_start(struct samsung_keypad *keypad)
178{
179 unsigned int val;
180
181 pm_runtime_get_sync(&keypad->pdev->dev);
182
183 /* Tell IRQ thread that it may poll the device. */
184 keypad->stopped = false;
185
186 clk_enable(keypad->clk);
187
188 /* Enable interrupt bits. */
189 val = readl(keypad->base + SAMSUNG_KEYIFCON);
190 val |= SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN;
191 writel(val, keypad->base + SAMSUNG_KEYIFCON);
192
193 /* KEYIFCOL reg clear. */
194 writel(0, keypad->base + SAMSUNG_KEYIFCOL);
195
196 pm_runtime_put(&keypad->pdev->dev);
197}
198
199static void samsung_keypad_stop(struct samsung_keypad *keypad)
200{
201 unsigned int val;
202
203 pm_runtime_get_sync(&keypad->pdev->dev);
204
205 /* Signal IRQ thread to stop polling and disable the handler. */
206 keypad->stopped = true;
207 wake_up(&keypad->wait);
208 disable_irq(keypad->irq);
209
210 /* Clear interrupt. */
211 writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
212
213 /* Disable interrupt bits. */
214 val = readl(keypad->base + SAMSUNG_KEYIFCON);
215 val &= ~(SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN);
216 writel(val, keypad->base + SAMSUNG_KEYIFCON);
217
218 clk_disable(keypad->clk);
219
220 /*
221 * Now that chip should not generate interrupts we can safely
222 * re-enable the handler.
223 */
224 enable_irq(keypad->irq);
225
226 pm_runtime_put(&keypad->pdev->dev);
227}
228
229static int samsung_keypad_open(struct input_dev *input_dev)
230{
231 struct samsung_keypad *keypad = input_get_drvdata(input_dev);
232
233 samsung_keypad_start(keypad);
234
235 return 0;
236}
237
238static void samsung_keypad_close(struct input_dev *input_dev)
239{
240 struct samsung_keypad *keypad = input_get_drvdata(input_dev);
241
242 samsung_keypad_stop(keypad);
243}
244
245#ifdef CONFIG_OF
246static struct samsung_keypad_platdata *
247samsung_keypad_parse_dt(struct device *dev)
248{
249 struct samsung_keypad_platdata *pdata;
250 struct matrix_keymap_data *keymap_data;
251 uint32_t *keymap, num_rows = 0, num_cols = 0;
252 struct device_node *np = dev->of_node, *key_np;
253 unsigned int key_count;
254
255 if (!np) {
256 dev_err(dev, "missing device tree data\n");
257 return ERR_PTR(-EINVAL);
258 }
259
260 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
261 if (!pdata) {
262 dev_err(dev, "could not allocate memory for platform data\n");
263 return ERR_PTR(-ENOMEM);
264 }
265
266 of_property_read_u32(np, "samsung,keypad-num-rows", &num_rows);
267 of_property_read_u32(np, "samsung,keypad-num-columns", &num_cols);
268 if (!num_rows || !num_cols) {
269 dev_err(dev, "number of keypad rows/columns not specified\n");
270 return ERR_PTR(-EINVAL);
271 }
272 pdata->rows = num_rows;
273 pdata->cols = num_cols;
274
275 keymap_data = devm_kzalloc(dev, sizeof(*keymap_data), GFP_KERNEL);
276 if (!keymap_data) {
277 dev_err(dev, "could not allocate memory for keymap data\n");
278 return ERR_PTR(-ENOMEM);
279 }
280 pdata->keymap_data = keymap_data;
281
282 key_count = of_get_child_count(np);
283 keymap_data->keymap_size = key_count;
284 keymap = devm_kzalloc(dev, sizeof(uint32_t) * key_count, GFP_KERNEL);
285 if (!keymap) {
286 dev_err(dev, "could not allocate memory for keymap\n");
287 return ERR_PTR(-ENOMEM);
288 }
289 keymap_data->keymap = keymap;
290
291 for_each_child_of_node(np, key_np) {
292 u32 row, col, key_code;
293 of_property_read_u32(key_np, "keypad,row", &row);
294 of_property_read_u32(key_np, "keypad,column", &col);
295 of_property_read_u32(key_np, "linux,code", &key_code);
296 *keymap++ = KEY(row, col, key_code);
297 }
298
299 if (of_get_property(np, "linux,input-no-autorepeat", NULL))
300 pdata->no_autorepeat = true;
301
302 if (of_get_property(np, "linux,input-wakeup", NULL))
303 pdata->wakeup = true;
304
305 return pdata;
306}
307#else
308static struct samsung_keypad_platdata *
309samsung_keypad_parse_dt(struct device *dev)
310{
311 dev_err(dev, "no platform data defined\n");
312
313 return ERR_PTR(-EINVAL);
314}
315#endif
316
317static int samsung_keypad_probe(struct platform_device *pdev)
318{
319 const struct samsung_keypad_platdata *pdata;
320 const struct matrix_keymap_data *keymap_data;
321 struct samsung_keypad *keypad;
322 struct resource *res;
323 struct input_dev *input_dev;
324 unsigned int row_shift;
325 unsigned int keymap_size;
326 int error;
327
328 pdata = dev_get_platdata(&pdev->dev);
329 if (!pdata) {
330 pdata = samsung_keypad_parse_dt(&pdev->dev);
331 if (IS_ERR(pdata))
332 return PTR_ERR(pdata);
333 }
334
335 keymap_data = pdata->keymap_data;
336 if (!keymap_data) {
337 dev_err(&pdev->dev, "no keymap data defined\n");
338 return -EINVAL;
339 }
340
341 if (!pdata->rows || pdata->rows > SAMSUNG_MAX_ROWS)
342 return -EINVAL;
343
344 if (!pdata->cols || pdata->cols > SAMSUNG_MAX_COLS)
345 return -EINVAL;
346
347 /* initialize the gpio */
348 if (pdata->cfg_gpio)
349 pdata->cfg_gpio(pdata->rows, pdata->cols);
350
351 row_shift = get_count_order(pdata->cols);
352 keymap_size = (pdata->rows << row_shift) * sizeof(keypad->keycodes[0]);
353
354 keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad) + keymap_size,
355 GFP_KERNEL);
356 input_dev = devm_input_allocate_device(&pdev->dev);
357 if (!keypad || !input_dev)
358 return -ENOMEM;
359
360 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
361 if (!res)
362 return -ENODEV;
363
364 keypad->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
365 if (!keypad->base)
366 return -EBUSY;
367
368 keypad->clk = devm_clk_get(&pdev->dev, "keypad");
369 if (IS_ERR(keypad->clk)) {
370 dev_err(&pdev->dev, "failed to get keypad clk\n");
371 return PTR_ERR(keypad->clk);
372 }
373
374 error = clk_prepare(keypad->clk);
375 if (error) {
376 dev_err(&pdev->dev, "keypad clock prepare failed\n");
377 return error;
378 }
379
380 keypad->input_dev = input_dev;
381 keypad->pdev = pdev;
382 keypad->row_shift = row_shift;
383 keypad->rows = pdata->rows;
384 keypad->cols = pdata->cols;
385 keypad->stopped = true;
386 init_waitqueue_head(&keypad->wait);
387
388 if (pdev->dev.of_node)
389 keypad->type = of_device_is_compatible(pdev->dev.of_node,
390 "samsung,s5pv210-keypad");
391 else
392 keypad->type = platform_get_device_id(pdev)->driver_data;
393
394 input_dev->name = pdev->name;
395 input_dev->id.bustype = BUS_HOST;
396 input_dev->dev.parent = &pdev->dev;
397
398 input_dev->open = samsung_keypad_open;
399 input_dev->close = samsung_keypad_close;
400
401 error = matrix_keypad_build_keymap(keymap_data, NULL,
402 pdata->rows, pdata->cols,
403 keypad->keycodes, input_dev);
404 if (error) {
405 dev_err(&pdev->dev, "failed to build keymap\n");
406 goto err_unprepare_clk;
407 }
408
409 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
410 if (!pdata->no_autorepeat)
411 __set_bit(EV_REP, input_dev->evbit);
412
413 input_set_drvdata(input_dev, keypad);
414
415 keypad->irq = platform_get_irq(pdev, 0);
416 if (keypad->irq < 0) {
417 error = keypad->irq;
418 goto err_unprepare_clk;
419 }
420
421 error = devm_request_threaded_irq(&pdev->dev, keypad->irq, NULL,
422 samsung_keypad_irq, IRQF_ONESHOT,
423 dev_name(&pdev->dev), keypad);
424 if (error) {
425 dev_err(&pdev->dev, "failed to register keypad interrupt\n");
426 goto err_unprepare_clk;
427 }
428
429 device_init_wakeup(&pdev->dev, pdata->wakeup);
430 platform_set_drvdata(pdev, keypad);
431 pm_runtime_enable(&pdev->dev);
432
433 error = input_register_device(keypad->input_dev);
434 if (error)
435 goto err_disable_runtime_pm;
436
437 if (pdev->dev.of_node) {
438 devm_kfree(&pdev->dev, (void *)pdata->keymap_data->keymap);
439 devm_kfree(&pdev->dev, (void *)pdata->keymap_data);
440 devm_kfree(&pdev->dev, (void *)pdata);
441 }
442 return 0;
443
444err_disable_runtime_pm:
445 pm_runtime_disable(&pdev->dev);
446 device_init_wakeup(&pdev->dev, 0);
447err_unprepare_clk:
448 clk_unprepare(keypad->clk);
449 return error;
450}
451
452static int samsung_keypad_remove(struct platform_device *pdev)
453{
454 struct samsung_keypad *keypad = platform_get_drvdata(pdev);
455
456 pm_runtime_disable(&pdev->dev);
457 device_init_wakeup(&pdev->dev, 0);
458
459 input_unregister_device(keypad->input_dev);
460
461 clk_unprepare(keypad->clk);
462
463 return 0;
464}
465
466#ifdef CONFIG_PM_RUNTIME
467static int samsung_keypad_runtime_suspend(struct device *dev)
468{
469 struct platform_device *pdev = to_platform_device(dev);
470 struct samsung_keypad *keypad = platform_get_drvdata(pdev);
471 unsigned int val;
472 int error;
473
474 if (keypad->stopped)
475 return 0;
476
477 /* This may fail on some SoCs due to lack of controller support */
478 error = enable_irq_wake(keypad->irq);
479 if (!error)
480 keypad->wake_enabled = true;
481
482 val = readl(keypad->base + SAMSUNG_KEYIFCON);
483 val |= SAMSUNG_KEYIFCON_WAKEUPEN;
484 writel(val, keypad->base + SAMSUNG_KEYIFCON);
485
486 clk_disable(keypad->clk);
487
488 return 0;
489}
490
491static int samsung_keypad_runtime_resume(struct device *dev)
492{
493 struct platform_device *pdev = to_platform_device(dev);
494 struct samsung_keypad *keypad = platform_get_drvdata(pdev);
495 unsigned int val;
496
497 if (keypad->stopped)
498 return 0;
499
500 clk_enable(keypad->clk);
501
502 val = readl(keypad->base + SAMSUNG_KEYIFCON);
503 val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
504 writel(val, keypad->base + SAMSUNG_KEYIFCON);
505
506 if (keypad->wake_enabled)
507 disable_irq_wake(keypad->irq);
508
509 return 0;
510}
511#endif
512
513#ifdef CONFIG_PM_SLEEP
514static void samsung_keypad_toggle_wakeup(struct samsung_keypad *keypad,
515 bool enable)
516{
517 unsigned int val;
518
519 clk_enable(keypad->clk);
520
521 val = readl(keypad->base + SAMSUNG_KEYIFCON);
522 if (enable) {
523 val |= SAMSUNG_KEYIFCON_WAKEUPEN;
524 if (device_may_wakeup(&keypad->pdev->dev))
525 enable_irq_wake(keypad->irq);
526 } else {
527 val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
528 if (device_may_wakeup(&keypad->pdev->dev))
529 disable_irq_wake(keypad->irq);
530 }
531 writel(val, keypad->base + SAMSUNG_KEYIFCON);
532
533 clk_disable(keypad->clk);
534}
535
536static int samsung_keypad_suspend(struct device *dev)
537{
538 struct platform_device *pdev = to_platform_device(dev);
539 struct samsung_keypad *keypad = platform_get_drvdata(pdev);
540 struct input_dev *input_dev = keypad->input_dev;
541
542 mutex_lock(&input_dev->mutex);
543
544 if (input_dev->users)
545 samsung_keypad_stop(keypad);
546
547 samsung_keypad_toggle_wakeup(keypad, true);
548
549 mutex_unlock(&input_dev->mutex);
550
551 return 0;
552}
553
554static int samsung_keypad_resume(struct device *dev)
555{
556 struct platform_device *pdev = to_platform_device(dev);
557 struct samsung_keypad *keypad = platform_get_drvdata(pdev);
558 struct input_dev *input_dev = keypad->input_dev;
559
560 mutex_lock(&input_dev->mutex);
561
562 samsung_keypad_toggle_wakeup(keypad, false);
563
564 if (input_dev->users)
565 samsung_keypad_start(keypad);
566
567 mutex_unlock(&input_dev->mutex);
568
569 return 0;
570}
571#endif
572
573static const struct dev_pm_ops samsung_keypad_pm_ops = {
574 SET_SYSTEM_SLEEP_PM_OPS(samsung_keypad_suspend, samsung_keypad_resume)
575 SET_RUNTIME_PM_OPS(samsung_keypad_runtime_suspend,
576 samsung_keypad_runtime_resume, NULL)
577};
578
579#ifdef CONFIG_OF
580static const struct of_device_id samsung_keypad_dt_match[] = {
581 { .compatible = "samsung,s3c6410-keypad" },
582 { .compatible = "samsung,s5pv210-keypad" },
583 {},
584};
585MODULE_DEVICE_TABLE(of, samsung_keypad_dt_match);
586#endif
587
588static struct platform_device_id samsung_keypad_driver_ids[] = {
589 {
590 .name = "samsung-keypad",
591 .driver_data = KEYPAD_TYPE_SAMSUNG,
592 }, {
593 .name = "s5pv210-keypad",
594 .driver_data = KEYPAD_TYPE_S5PV210,
595 },
596 { },
597};
598MODULE_DEVICE_TABLE(platform, samsung_keypad_driver_ids);
599
600static struct platform_driver samsung_keypad_driver = {
601 .probe = samsung_keypad_probe,
602 .remove = samsung_keypad_remove,
603 .driver = {
604 .name = "samsung-keypad",
605 .owner = THIS_MODULE,
606 .of_match_table = of_match_ptr(samsung_keypad_dt_match),
607 .pm = &samsung_keypad_pm_ops,
608 },
609 .id_table = samsung_keypad_driver_ids,
610};
611module_platform_driver(samsung_keypad_driver);
612
613MODULE_DESCRIPTION("Samsung keypad driver");
614MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
615MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
616MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Samsung keypad driver
4 *
5 * Copyright (C) 2010 Samsung Electronics Co.Ltd
6 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
7 * Author: Donghwa Lee <dh09.lee@samsung.com>
8 */
9
10#include <linux/clk.h>
11#include <linux/delay.h>
12#include <linux/err.h>
13#include <linux/input.h>
14#include <linux/interrupt.h>
15#include <linux/io.h>
16#include <linux/module.h>
17#include <linux/platform_device.h>
18#include <linux/pm.h>
19#include <linux/pm_runtime.h>
20#include <linux/slab.h>
21#include <linux/of.h>
22#include <linux/sched.h>
23#include <linux/input/samsung-keypad.h>
24
25#define SAMSUNG_KEYIFCON 0x00
26#define SAMSUNG_KEYIFSTSCLR 0x04
27#define SAMSUNG_KEYIFCOL 0x08
28#define SAMSUNG_KEYIFROW 0x0c
29#define SAMSUNG_KEYIFFC 0x10
30
31/* SAMSUNG_KEYIFCON */
32#define SAMSUNG_KEYIFCON_INT_F_EN (1 << 0)
33#define SAMSUNG_KEYIFCON_INT_R_EN (1 << 1)
34#define SAMSUNG_KEYIFCON_DF_EN (1 << 2)
35#define SAMSUNG_KEYIFCON_FC_EN (1 << 3)
36#define SAMSUNG_KEYIFCON_WAKEUPEN (1 << 4)
37
38/* SAMSUNG_KEYIFSTSCLR */
39#define SAMSUNG_KEYIFSTSCLR_P_INT_MASK (0xff << 0)
40#define SAMSUNG_KEYIFSTSCLR_R_INT_MASK (0xff << 8)
41#define SAMSUNG_KEYIFSTSCLR_R_INT_OFFSET 8
42#define S5PV210_KEYIFSTSCLR_P_INT_MASK (0x3fff << 0)
43#define S5PV210_KEYIFSTSCLR_R_INT_MASK (0x3fff << 16)
44#define S5PV210_KEYIFSTSCLR_R_INT_OFFSET 16
45
46/* SAMSUNG_KEYIFCOL */
47#define SAMSUNG_KEYIFCOL_MASK (0xff << 0)
48#define S5PV210_KEYIFCOLEN_MASK (0xff << 8)
49
50/* SAMSUNG_KEYIFROW */
51#define SAMSUNG_KEYIFROW_MASK (0xff << 0)
52#define S5PV210_KEYIFROW_MASK (0x3fff << 0)
53
54/* SAMSUNG_KEYIFFC */
55#define SAMSUNG_KEYIFFC_MASK (0x3ff << 0)
56
57enum samsung_keypad_type {
58 KEYPAD_TYPE_SAMSUNG,
59 KEYPAD_TYPE_S5PV210,
60};
61
62struct samsung_keypad {
63 struct input_dev *input_dev;
64 struct platform_device *pdev;
65 struct clk *clk;
66 void __iomem *base;
67 wait_queue_head_t wait;
68 bool stopped;
69 bool wake_enabled;
70 int irq;
71 enum samsung_keypad_type type;
72 unsigned int row_shift;
73 unsigned int rows;
74 unsigned int cols;
75 unsigned int row_state[SAMSUNG_MAX_COLS];
76 unsigned short keycodes[];
77};
78
79static void samsung_keypad_scan(struct samsung_keypad *keypad,
80 unsigned int *row_state)
81{
82 unsigned int col;
83 unsigned int val;
84
85 for (col = 0; col < keypad->cols; col++) {
86 if (keypad->type == KEYPAD_TYPE_S5PV210) {
87 val = S5PV210_KEYIFCOLEN_MASK;
88 val &= ~(1 << col) << 8;
89 } else {
90 val = SAMSUNG_KEYIFCOL_MASK;
91 val &= ~(1 << col);
92 }
93
94 writel(val, keypad->base + SAMSUNG_KEYIFCOL);
95 mdelay(1);
96
97 val = readl(keypad->base + SAMSUNG_KEYIFROW);
98 row_state[col] = ~val & ((1 << keypad->rows) - 1);
99 }
100
101 /* KEYIFCOL reg clear */
102 writel(0, keypad->base + SAMSUNG_KEYIFCOL);
103}
104
105static bool samsung_keypad_report(struct samsung_keypad *keypad,
106 unsigned int *row_state)
107{
108 struct input_dev *input_dev = keypad->input_dev;
109 unsigned int changed;
110 unsigned int pressed;
111 unsigned int key_down = 0;
112 unsigned int val;
113 unsigned int col, row;
114
115 for (col = 0; col < keypad->cols; col++) {
116 changed = row_state[col] ^ keypad->row_state[col];
117 key_down |= row_state[col];
118 if (!changed)
119 continue;
120
121 for (row = 0; row < keypad->rows; row++) {
122 if (!(changed & (1 << row)))
123 continue;
124
125 pressed = row_state[col] & (1 << row);
126
127 dev_dbg(&keypad->input_dev->dev,
128 "key %s, row: %d, col: %d\n",
129 pressed ? "pressed" : "released", row, col);
130
131 val = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
132
133 input_event(input_dev, EV_MSC, MSC_SCAN, val);
134 input_report_key(input_dev,
135 keypad->keycodes[val], pressed);
136 }
137 input_sync(keypad->input_dev);
138 }
139
140 memcpy(keypad->row_state, row_state, sizeof(keypad->row_state));
141
142 return key_down;
143}
144
145static irqreturn_t samsung_keypad_irq(int irq, void *dev_id)
146{
147 struct samsung_keypad *keypad = dev_id;
148 unsigned int row_state[SAMSUNG_MAX_COLS];
149 bool key_down;
150
151 pm_runtime_get_sync(&keypad->pdev->dev);
152
153 do {
154 readl(keypad->base + SAMSUNG_KEYIFSTSCLR);
155 /* Clear interrupt. */
156 writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
157
158 samsung_keypad_scan(keypad, row_state);
159
160 key_down = samsung_keypad_report(keypad, row_state);
161 if (key_down)
162 wait_event_timeout(keypad->wait, keypad->stopped,
163 msecs_to_jiffies(50));
164
165 } while (key_down && !keypad->stopped);
166
167 pm_runtime_put(&keypad->pdev->dev);
168
169 return IRQ_HANDLED;
170}
171
172static void samsung_keypad_start(struct samsung_keypad *keypad)
173{
174 unsigned int val;
175
176 pm_runtime_get_sync(&keypad->pdev->dev);
177
178 /* Tell IRQ thread that it may poll the device. */
179 keypad->stopped = false;
180
181 clk_enable(keypad->clk);
182
183 /* Enable interrupt bits. */
184 val = readl(keypad->base + SAMSUNG_KEYIFCON);
185 val |= SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN;
186 writel(val, keypad->base + SAMSUNG_KEYIFCON);
187
188 /* KEYIFCOL reg clear. */
189 writel(0, keypad->base + SAMSUNG_KEYIFCOL);
190
191 pm_runtime_put(&keypad->pdev->dev);
192}
193
194static void samsung_keypad_stop(struct samsung_keypad *keypad)
195{
196 unsigned int val;
197
198 pm_runtime_get_sync(&keypad->pdev->dev);
199
200 /* Signal IRQ thread to stop polling and disable the handler. */
201 keypad->stopped = true;
202 wake_up(&keypad->wait);
203 disable_irq(keypad->irq);
204
205 /* Clear interrupt. */
206 writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
207
208 /* Disable interrupt bits. */
209 val = readl(keypad->base + SAMSUNG_KEYIFCON);
210 val &= ~(SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN);
211 writel(val, keypad->base + SAMSUNG_KEYIFCON);
212
213 clk_disable(keypad->clk);
214
215 /*
216 * Now that chip should not generate interrupts we can safely
217 * re-enable the handler.
218 */
219 enable_irq(keypad->irq);
220
221 pm_runtime_put(&keypad->pdev->dev);
222}
223
224static int samsung_keypad_open(struct input_dev *input_dev)
225{
226 struct samsung_keypad *keypad = input_get_drvdata(input_dev);
227
228 samsung_keypad_start(keypad);
229
230 return 0;
231}
232
233static void samsung_keypad_close(struct input_dev *input_dev)
234{
235 struct samsung_keypad *keypad = input_get_drvdata(input_dev);
236
237 samsung_keypad_stop(keypad);
238}
239
240#ifdef CONFIG_OF
241static struct samsung_keypad_platdata *
242samsung_keypad_parse_dt(struct device *dev)
243{
244 struct samsung_keypad_platdata *pdata;
245 struct matrix_keymap_data *keymap_data;
246 uint32_t *keymap, num_rows = 0, num_cols = 0;
247 struct device_node *np = dev->of_node, *key_np;
248 unsigned int key_count;
249
250 if (!np) {
251 dev_err(dev, "missing device tree data\n");
252 return ERR_PTR(-EINVAL);
253 }
254
255 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
256 if (!pdata) {
257 dev_err(dev, "could not allocate memory for platform data\n");
258 return ERR_PTR(-ENOMEM);
259 }
260
261 of_property_read_u32(np, "samsung,keypad-num-rows", &num_rows);
262 of_property_read_u32(np, "samsung,keypad-num-columns", &num_cols);
263 if (!num_rows || !num_cols) {
264 dev_err(dev, "number of keypad rows/columns not specified\n");
265 return ERR_PTR(-EINVAL);
266 }
267 pdata->rows = num_rows;
268 pdata->cols = num_cols;
269
270 keymap_data = devm_kzalloc(dev, sizeof(*keymap_data), GFP_KERNEL);
271 if (!keymap_data) {
272 dev_err(dev, "could not allocate memory for keymap data\n");
273 return ERR_PTR(-ENOMEM);
274 }
275 pdata->keymap_data = keymap_data;
276
277 key_count = of_get_child_count(np);
278 keymap_data->keymap_size = key_count;
279 keymap = devm_kcalloc(dev, key_count, sizeof(uint32_t), GFP_KERNEL);
280 if (!keymap) {
281 dev_err(dev, "could not allocate memory for keymap\n");
282 return ERR_PTR(-ENOMEM);
283 }
284 keymap_data->keymap = keymap;
285
286 for_each_child_of_node(np, key_np) {
287 u32 row, col, key_code;
288 of_property_read_u32(key_np, "keypad,row", &row);
289 of_property_read_u32(key_np, "keypad,column", &col);
290 of_property_read_u32(key_np, "linux,code", &key_code);
291 *keymap++ = KEY(row, col, key_code);
292 }
293
294 if (of_get_property(np, "linux,input-no-autorepeat", NULL))
295 pdata->no_autorepeat = true;
296
297 pdata->wakeup = of_property_read_bool(np, "wakeup-source") ||
298 /* legacy name */
299 of_property_read_bool(np, "linux,input-wakeup");
300
301
302 return pdata;
303}
304#else
305static struct samsung_keypad_platdata *
306samsung_keypad_parse_dt(struct device *dev)
307{
308 dev_err(dev, "no platform data defined\n");
309
310 return ERR_PTR(-EINVAL);
311}
312#endif
313
314static int samsung_keypad_probe(struct platform_device *pdev)
315{
316 const struct samsung_keypad_platdata *pdata;
317 const struct matrix_keymap_data *keymap_data;
318 struct samsung_keypad *keypad;
319 struct resource *res;
320 struct input_dev *input_dev;
321 unsigned int row_shift;
322 unsigned int keymap_size;
323 int error;
324
325 pdata = dev_get_platdata(&pdev->dev);
326 if (!pdata) {
327 pdata = samsung_keypad_parse_dt(&pdev->dev);
328 if (IS_ERR(pdata))
329 return PTR_ERR(pdata);
330 }
331
332 keymap_data = pdata->keymap_data;
333 if (!keymap_data) {
334 dev_err(&pdev->dev, "no keymap data defined\n");
335 return -EINVAL;
336 }
337
338 if (!pdata->rows || pdata->rows > SAMSUNG_MAX_ROWS)
339 return -EINVAL;
340
341 if (!pdata->cols || pdata->cols > SAMSUNG_MAX_COLS)
342 return -EINVAL;
343
344 /* initialize the gpio */
345 if (pdata->cfg_gpio)
346 pdata->cfg_gpio(pdata->rows, pdata->cols);
347
348 row_shift = get_count_order(pdata->cols);
349 keymap_size = (pdata->rows << row_shift) * sizeof(keypad->keycodes[0]);
350
351 keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad) + keymap_size,
352 GFP_KERNEL);
353 input_dev = devm_input_allocate_device(&pdev->dev);
354 if (!keypad || !input_dev)
355 return -ENOMEM;
356
357 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
358 if (!res)
359 return -ENODEV;
360
361 keypad->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
362 if (!keypad->base)
363 return -EBUSY;
364
365 keypad->clk = devm_clk_get(&pdev->dev, "keypad");
366 if (IS_ERR(keypad->clk)) {
367 dev_err(&pdev->dev, "failed to get keypad clk\n");
368 return PTR_ERR(keypad->clk);
369 }
370
371 error = clk_prepare(keypad->clk);
372 if (error) {
373 dev_err(&pdev->dev, "keypad clock prepare failed\n");
374 return error;
375 }
376
377 keypad->input_dev = input_dev;
378 keypad->pdev = pdev;
379 keypad->row_shift = row_shift;
380 keypad->rows = pdata->rows;
381 keypad->cols = pdata->cols;
382 keypad->stopped = true;
383 init_waitqueue_head(&keypad->wait);
384
385 if (pdev->dev.of_node)
386 keypad->type = of_device_is_compatible(pdev->dev.of_node,
387 "samsung,s5pv210-keypad");
388 else
389 keypad->type = platform_get_device_id(pdev)->driver_data;
390
391 input_dev->name = pdev->name;
392 input_dev->id.bustype = BUS_HOST;
393 input_dev->dev.parent = &pdev->dev;
394
395 input_dev->open = samsung_keypad_open;
396 input_dev->close = samsung_keypad_close;
397
398 error = matrix_keypad_build_keymap(keymap_data, NULL,
399 pdata->rows, pdata->cols,
400 keypad->keycodes, input_dev);
401 if (error) {
402 dev_err(&pdev->dev, "failed to build keymap\n");
403 goto err_unprepare_clk;
404 }
405
406 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
407 if (!pdata->no_autorepeat)
408 __set_bit(EV_REP, input_dev->evbit);
409
410 input_set_drvdata(input_dev, keypad);
411
412 keypad->irq = platform_get_irq(pdev, 0);
413 if (keypad->irq < 0) {
414 error = keypad->irq;
415 goto err_unprepare_clk;
416 }
417
418 error = devm_request_threaded_irq(&pdev->dev, keypad->irq, NULL,
419 samsung_keypad_irq, IRQF_ONESHOT,
420 dev_name(&pdev->dev), keypad);
421 if (error) {
422 dev_err(&pdev->dev, "failed to register keypad interrupt\n");
423 goto err_unprepare_clk;
424 }
425
426 device_init_wakeup(&pdev->dev, pdata->wakeup);
427 platform_set_drvdata(pdev, keypad);
428 pm_runtime_enable(&pdev->dev);
429
430 error = input_register_device(keypad->input_dev);
431 if (error)
432 goto err_disable_runtime_pm;
433
434 if (pdev->dev.of_node) {
435 devm_kfree(&pdev->dev, (void *)pdata->keymap_data->keymap);
436 devm_kfree(&pdev->dev, (void *)pdata->keymap_data);
437 devm_kfree(&pdev->dev, (void *)pdata);
438 }
439 return 0;
440
441err_disable_runtime_pm:
442 pm_runtime_disable(&pdev->dev);
443err_unprepare_clk:
444 clk_unprepare(keypad->clk);
445 return error;
446}
447
448static int samsung_keypad_remove(struct platform_device *pdev)
449{
450 struct samsung_keypad *keypad = platform_get_drvdata(pdev);
451
452 pm_runtime_disable(&pdev->dev);
453
454 input_unregister_device(keypad->input_dev);
455
456 clk_unprepare(keypad->clk);
457
458 return 0;
459}
460
461#ifdef CONFIG_PM
462static 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
486static 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
509static 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
531static 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_device_enabled(input_dev))
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
549static 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_device_enabled(input_dev))
560 samsung_keypad_start(keypad);
561
562 mutex_unlock(&input_dev->mutex);
563
564 return 0;
565}
566#endif
567
568static 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
575static const struct of_device_id samsung_keypad_dt_match[] = {
576 { .compatible = "samsung,s3c6410-keypad" },
577 { .compatible = "samsung,s5pv210-keypad" },
578 {},
579};
580MODULE_DEVICE_TABLE(of, samsung_keypad_dt_match);
581#endif
582
583static const 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};
593MODULE_DEVICE_TABLE(platform, samsung_keypad_driver_ids);
594
595static struct platform_driver samsung_keypad_driver = {
596 .probe = samsung_keypad_probe,
597 .remove = samsung_keypad_remove,
598 .driver = {
599 .name = "samsung-keypad",
600 .of_match_table = of_match_ptr(samsung_keypad_dt_match),
601 .pm = &samsung_keypad_pm_ops,
602 },
603 .id_table = samsung_keypad_driver_ids,
604};
605module_platform_driver(samsung_keypad_driver);
606
607MODULE_DESCRIPTION("Samsung keypad driver");
608MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
609MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
610MODULE_LICENSE("GPL");