xref: /linux/drivers/input/keyboard/samsung-keypad.c (revision 148f9bb87745ed45f7a11b2cbd3bc0f017d5d257) 
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");
612