1 /*
2  * OMAP4 Keypad Driver
3  *
4  * Copyright (C) 2010 Texas Instruments
5  *
6  * Author: Abraham Arce <x0066660@ti.com>
7  * Initial Code: Syed Rafiuddin <rafiuddin.syed@ti.com>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22  */
23 
24 #include <linux/module.h>
25 #include <linux/interrupt.h>
26 #include <linux/platform_device.h>
27 #include <linux/errno.h>
28 #include <linux/io.h>
29 #include <linux/of.h>
30 #include <linux/input.h>
31 #include <linux/input/matrix_keypad.h>
32 #include <linux/slab.h>
33 #include <linux/pm_runtime.h>
34 
35 /* OMAP4 registers */
36 #define OMAP4_KBD_REVISION		0x00
37 #define OMAP4_KBD_SYSCONFIG		0x10
38 #define OMAP4_KBD_SYSSTATUS		0x14
39 #define OMAP4_KBD_IRQSTATUS		0x18
40 #define OMAP4_KBD_IRQENABLE		0x1C
41 #define OMAP4_KBD_WAKEUPENABLE		0x20
42 #define OMAP4_KBD_PENDING		0x24
43 #define OMAP4_KBD_CTRL			0x28
44 #define OMAP4_KBD_DEBOUNCINGTIME	0x2C
45 #define OMAP4_KBD_LONGKEYTIME		0x30
46 #define OMAP4_KBD_TIMEOUT		0x34
47 #define OMAP4_KBD_STATEMACHINE		0x38
48 #define OMAP4_KBD_ROWINPUTS		0x3C
49 #define OMAP4_KBD_COLUMNOUTPUTS		0x40
50 #define OMAP4_KBD_FULLCODE31_0		0x44
51 #define OMAP4_KBD_FULLCODE63_32		0x48
52 
53 /* OMAP4 bit definitions */
54 #define OMAP4_DEF_IRQENABLE_EVENTEN	BIT(0)
55 #define OMAP4_DEF_IRQENABLE_LONGKEY	BIT(1)
56 #define OMAP4_DEF_WUP_EVENT_ENA		BIT(0)
57 #define OMAP4_DEF_WUP_LONG_KEY_ENA	BIT(1)
58 #define OMAP4_DEF_CTRL_NOSOFTMODE	BIT(1)
59 #define OMAP4_DEF_CTRL_PTV_SHIFT	2
60 
61 /* OMAP4 values */
62 #define OMAP4_VAL_IRQDISABLE		0x0
63 #define OMAP4_VAL_DEBOUNCINGTIME	0x7
64 #define OMAP4_VAL_PVT			0x7
65 
66 enum {
67 	KBD_REVISION_OMAP4 = 0,
68 	KBD_REVISION_OMAP5,
69 };
70 
71 struct omap4_keypad {
72 	struct input_dev *input;
73 
74 	void __iomem *base;
75 	bool irq_wake_enabled;
76 	unsigned int irq;
77 
78 	unsigned int rows;
79 	unsigned int cols;
80 	u32 reg_offset;
81 	u32 irqreg_offset;
82 	unsigned int row_shift;
83 	bool no_autorepeat;
84 	unsigned char key_state[8];
85 	unsigned short *keymap;
86 };
87 
88 static int kbd_readl(struct omap4_keypad *keypad_data, u32 offset)
89 {
90 	return __raw_readl(keypad_data->base +
91 				keypad_data->reg_offset + offset);
92 }
93 
94 static void kbd_writel(struct omap4_keypad *keypad_data, u32 offset, u32 value)
95 {
96 	__raw_writel(value,
97 		     keypad_data->base + keypad_data->reg_offset + offset);
98 }
99 
100 static int kbd_read_irqreg(struct omap4_keypad *keypad_data, u32 offset)
101 {
102 	return __raw_readl(keypad_data->base +
103 				keypad_data->irqreg_offset + offset);
104 }
105 
106 static void kbd_write_irqreg(struct omap4_keypad *keypad_data,
107 			     u32 offset, u32 value)
108 {
109 	__raw_writel(value,
110 		     keypad_data->base + keypad_data->irqreg_offset + offset);
111 }
112 
113 
114 /* Interrupt handlers */
115 static irqreturn_t omap4_keypad_irq_handler(int irq, void *dev_id)
116 {
117 	struct omap4_keypad *keypad_data = dev_id;
118 
119 	if (kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS)) {
120 		/* Disable interrupts */
121 		kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
122 				 OMAP4_VAL_IRQDISABLE);
123 		return IRQ_WAKE_THREAD;
124 	}
125 
126 	return IRQ_NONE;
127 }
128 
129 static irqreturn_t omap4_keypad_irq_thread_fn(int irq, void *dev_id)
130 {
131 	struct omap4_keypad *keypad_data = dev_id;
132 	struct input_dev *input_dev = keypad_data->input;
133 	unsigned char key_state[ARRAY_SIZE(keypad_data->key_state)];
134 	unsigned int col, row, code, changed;
135 	u32 *new_state = (u32 *) key_state;
136 
137 	*new_state = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0);
138 	*(new_state + 1) = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32);
139 
140 	for (row = 0; row < keypad_data->rows; row++) {
141 		changed = key_state[row] ^ keypad_data->key_state[row];
142 		if (!changed)
143 			continue;
144 
145 		for (col = 0; col < keypad_data->cols; col++) {
146 			if (changed & (1 << col)) {
147 				code = MATRIX_SCAN_CODE(row, col,
148 						keypad_data->row_shift);
149 				input_event(input_dev, EV_MSC, MSC_SCAN, code);
150 				input_report_key(input_dev,
151 						 keypad_data->keymap[code],
152 						 key_state[row] & (1 << col));
153 			}
154 		}
155 	}
156 
157 	input_sync(input_dev);
158 
159 	memcpy(keypad_data->key_state, key_state,
160 		sizeof(keypad_data->key_state));
161 
162 	/* clear pending interrupts */
163 	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
164 			 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
165 
166 	/* enable interrupts */
167 	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
168 		OMAP4_DEF_IRQENABLE_EVENTEN |
169 				OMAP4_DEF_IRQENABLE_LONGKEY);
170 
171 	return IRQ_HANDLED;
172 }
173 
174 static int omap4_keypad_open(struct input_dev *input)
175 {
176 	struct omap4_keypad *keypad_data = input_get_drvdata(input);
177 
178 	pm_runtime_get_sync(input->dev.parent);
179 
180 	disable_irq(keypad_data->irq);
181 
182 	kbd_writel(keypad_data, OMAP4_KBD_CTRL,
183 			OMAP4_DEF_CTRL_NOSOFTMODE |
184 			(OMAP4_VAL_PVT << OMAP4_DEF_CTRL_PTV_SHIFT));
185 	kbd_writel(keypad_data, OMAP4_KBD_DEBOUNCINGTIME,
186 			OMAP4_VAL_DEBOUNCINGTIME);
187 	/* clear pending interrupts */
188 	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
189 			 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
190 	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
191 			OMAP4_DEF_IRQENABLE_EVENTEN |
192 				OMAP4_DEF_IRQENABLE_LONGKEY);
193 	kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE,
194 			OMAP4_DEF_WUP_EVENT_ENA | OMAP4_DEF_WUP_LONG_KEY_ENA);
195 
196 	enable_irq(keypad_data->irq);
197 
198 	return 0;
199 }
200 
201 static void omap4_keypad_close(struct input_dev *input)
202 {
203 	struct omap4_keypad *keypad_data = input_get_drvdata(input);
204 
205 	disable_irq(keypad_data->irq);
206 
207 	/* Disable interrupts */
208 	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
209 			 OMAP4_VAL_IRQDISABLE);
210 
211 	/* clear pending interrupts */
212 	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
213 			 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
214 
215 	enable_irq(keypad_data->irq);
216 
217 	pm_runtime_put_sync(input->dev.parent);
218 }
219 
220 static int omap4_keypad_parse_dt(struct device *dev,
221 				 struct omap4_keypad *keypad_data)
222 {
223 	struct device_node *np = dev->of_node;
224 	int err;
225 
226 	err = matrix_keypad_parse_of_params(dev, &keypad_data->rows,
227 					    &keypad_data->cols);
228 	if (err)
229 		return err;
230 
231 	if (of_get_property(np, "linux,input-no-autorepeat", NULL))
232 		keypad_data->no_autorepeat = true;
233 
234 	return 0;
235 }
236 
237 static int omap4_keypad_probe(struct platform_device *pdev)
238 {
239 	struct omap4_keypad *keypad_data;
240 	struct input_dev *input_dev;
241 	struct resource *res;
242 	unsigned int max_keys;
243 	int rev;
244 	int irq;
245 	int error;
246 
247 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
248 	if (!res) {
249 		dev_err(&pdev->dev, "no base address specified\n");
250 		return -EINVAL;
251 	}
252 
253 	irq = platform_get_irq(pdev, 0);
254 	if (!irq) {
255 		dev_err(&pdev->dev, "no keyboard irq assigned\n");
256 		return -EINVAL;
257 	}
258 
259 	keypad_data = kzalloc(sizeof(struct omap4_keypad), GFP_KERNEL);
260 	if (!keypad_data) {
261 		dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
262 		return -ENOMEM;
263 	}
264 
265 	keypad_data->irq = irq;
266 
267 	error = omap4_keypad_parse_dt(&pdev->dev, keypad_data);
268 	if (error)
269 		return error;
270 
271 	res = request_mem_region(res->start, resource_size(res), pdev->name);
272 	if (!res) {
273 		dev_err(&pdev->dev, "can't request mem region\n");
274 		error = -EBUSY;
275 		goto err_free_keypad;
276 	}
277 
278 	keypad_data->base = ioremap(res->start, resource_size(res));
279 	if (!keypad_data->base) {
280 		dev_err(&pdev->dev, "can't ioremap mem resource\n");
281 		error = -ENOMEM;
282 		goto err_release_mem;
283 	}
284 
285 
286 	/*
287 	 * Enable clocks for the keypad module so that we can read
288 	 * revision register.
289 	 */
290 	pm_runtime_enable(&pdev->dev);
291 	error = pm_runtime_get_sync(&pdev->dev);
292 	if (error) {
293 		dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
294 		goto err_unmap;
295 	}
296 	rev = __raw_readl(keypad_data->base + OMAP4_KBD_REVISION);
297 	rev &= 0x03 << 30;
298 	rev >>= 30;
299 	switch (rev) {
300 	case KBD_REVISION_OMAP4:
301 		keypad_data->reg_offset = 0x00;
302 		keypad_data->irqreg_offset = 0x00;
303 		break;
304 	case KBD_REVISION_OMAP5:
305 		keypad_data->reg_offset = 0x10;
306 		keypad_data->irqreg_offset = 0x0c;
307 		break;
308 	default:
309 		dev_err(&pdev->dev,
310 			"Keypad reports unsupported revision %d", rev);
311 		error = -EINVAL;
312 		goto err_pm_put_sync;
313 	}
314 
315 	/* input device allocation */
316 	keypad_data->input = input_dev = input_allocate_device();
317 	if (!input_dev) {
318 		error = -ENOMEM;
319 		goto err_pm_put_sync;
320 	}
321 
322 	input_dev->name = pdev->name;
323 	input_dev->dev.parent = &pdev->dev;
324 	input_dev->id.bustype = BUS_HOST;
325 	input_dev->id.vendor = 0x0001;
326 	input_dev->id.product = 0x0001;
327 	input_dev->id.version = 0x0001;
328 
329 	input_dev->open = omap4_keypad_open;
330 	input_dev->close = omap4_keypad_close;
331 
332 	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
333 	if (!keypad_data->no_autorepeat)
334 		__set_bit(EV_REP, input_dev->evbit);
335 
336 	input_set_drvdata(input_dev, keypad_data);
337 
338 	keypad_data->row_shift = get_count_order(keypad_data->cols);
339 	max_keys = keypad_data->rows << keypad_data->row_shift;
340 	keypad_data->keymap = kzalloc(max_keys * sizeof(keypad_data->keymap[0]),
341 				      GFP_KERNEL);
342 	if (!keypad_data->keymap) {
343 		dev_err(&pdev->dev, "Not enough memory for keymap\n");
344 		error = -ENOMEM;
345 		goto err_free_input;
346 	}
347 
348 	error = matrix_keypad_build_keymap(NULL, NULL,
349 					   keypad_data->rows, keypad_data->cols,
350 					   keypad_data->keymap, input_dev);
351 	if (error) {
352 		dev_err(&pdev->dev, "failed to build keymap\n");
353 		goto err_free_keymap;
354 	}
355 
356 	error = request_threaded_irq(keypad_data->irq, omap4_keypad_irq_handler,
357 				     omap4_keypad_irq_thread_fn, 0,
358 				     "omap4-keypad", keypad_data);
359 	if (error) {
360 		dev_err(&pdev->dev, "failed to register interrupt\n");
361 		goto err_free_input;
362 	}
363 
364 	device_init_wakeup(&pdev->dev, true);
365 	pm_runtime_put_sync(&pdev->dev);
366 
367 	error = input_register_device(keypad_data->input);
368 	if (error < 0) {
369 		dev_err(&pdev->dev, "failed to register input device\n");
370 		goto err_pm_disable;
371 	}
372 
373 	platform_set_drvdata(pdev, keypad_data);
374 	return 0;
375 
376 err_pm_disable:
377 	pm_runtime_disable(&pdev->dev);
378 	device_init_wakeup(&pdev->dev, false);
379 	free_irq(keypad_data->irq, keypad_data);
380 err_free_keymap:
381 	kfree(keypad_data->keymap);
382 err_free_input:
383 	input_free_device(input_dev);
384 err_pm_put_sync:
385 	pm_runtime_put_sync(&pdev->dev);
386 err_unmap:
387 	iounmap(keypad_data->base);
388 err_release_mem:
389 	release_mem_region(res->start, resource_size(res));
390 err_free_keypad:
391 	kfree(keypad_data);
392 	return error;
393 }
394 
395 static int omap4_keypad_remove(struct platform_device *pdev)
396 {
397 	struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
398 	struct resource *res;
399 
400 	free_irq(keypad_data->irq, keypad_data);
401 
402 	pm_runtime_disable(&pdev->dev);
403 
404 	device_init_wakeup(&pdev->dev, false);
405 
406 	input_unregister_device(keypad_data->input);
407 
408 	iounmap(keypad_data->base);
409 
410 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
411 	release_mem_region(res->start, resource_size(res));
412 
413 	kfree(keypad_data->keymap);
414 	kfree(keypad_data);
415 
416 	return 0;
417 }
418 
419 static const struct of_device_id omap_keypad_dt_match[] = {
420 	{ .compatible = "ti,omap4-keypad" },
421 	{},
422 };
423 MODULE_DEVICE_TABLE(of, omap_keypad_dt_match);
424 
425 #ifdef CONFIG_PM_SLEEP
426 static int omap4_keypad_suspend(struct device *dev)
427 {
428 	struct platform_device *pdev = to_platform_device(dev);
429 	struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
430 	int error;
431 
432 	if (device_may_wakeup(&pdev->dev)) {
433 		error = enable_irq_wake(keypad_data->irq);
434 		if (!error)
435 			keypad_data->irq_wake_enabled = true;
436 	}
437 
438 	return 0;
439 }
440 
441 static int omap4_keypad_resume(struct device *dev)
442 {
443 	struct platform_device *pdev = to_platform_device(dev);
444 	struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
445 
446 	if (device_may_wakeup(&pdev->dev) && keypad_data->irq_wake_enabled) {
447 		disable_irq_wake(keypad_data->irq);
448 		keypad_data->irq_wake_enabled = false;
449 	}
450 
451 	return 0;
452 }
453 #endif
454 
455 static SIMPLE_DEV_PM_OPS(omap4_keypad_pm_ops,
456 			 omap4_keypad_suspend, omap4_keypad_resume);
457 
458 static struct platform_driver omap4_keypad_driver = {
459 	.probe		= omap4_keypad_probe,
460 	.remove		= omap4_keypad_remove,
461 	.driver		= {
462 		.name	= "omap4-keypad",
463 		.pm	= &omap4_keypad_pm_ops,
464 		.of_match_table = omap_keypad_dt_match,
465 	},
466 };
467 module_platform_driver(omap4_keypad_driver);
468 
469 MODULE_AUTHOR("Texas Instruments");
470 MODULE_DESCRIPTION("OMAP4 Keypad Driver");
471 MODULE_LICENSE("GPL");
472 MODULE_ALIAS("platform:omap4-keypad");
473