?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
FRV: Use generic show_interrupts()
[cris-mirror.git] / drivers / input / keyboard / samsung-keypad.c
blobf689f49e31093d406a8a93e78827d797f9d9aa4f
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/slab.h>
24 #include <linux/sched.h>
25 #include <plat/keypad.h>
26
27 #define SAMSUNG_KEYIFCON 0x00
28 #define SAMSUNG_KEYIFSTSCLR 0x04
29 #define SAMSUNG_KEYIFCOL 0x08
30 #define SAMSUNG_KEYIFROW 0x0c
31 #define SAMSUNG_KEYIFFC 0x10
32
33 /* SAMSUNG_KEYIFCON */
34 #define SAMSUNG_KEYIFCON_INT_F_EN (1 << 0)
35 #define SAMSUNG_KEYIFCON_INT_R_EN (1 << 1)
36 #define SAMSUNG_KEYIFCON_DF_EN (1 << 2)
37 #define SAMSUNG_KEYIFCON_FC_EN (1 << 3)
38 #define SAMSUNG_KEYIFCON_WAKEUPEN (1 << 4)
39
40 /* SAMSUNG_KEYIFSTSCLR */
41 #define SAMSUNG_KEYIFSTSCLR_P_INT_MASK (0xff << 0)
42 #define SAMSUNG_KEYIFSTSCLR_R_INT_MASK (0xff << 8)
43 #define SAMSUNG_KEYIFSTSCLR_R_INT_OFFSET 8
44 #define S5PV210_KEYIFSTSCLR_P_INT_MASK (0x3fff << 0)
45 #define S5PV210_KEYIFSTSCLR_R_INT_MASK (0x3fff << 16)
46 #define S5PV210_KEYIFSTSCLR_R_INT_OFFSET 16
47
48 /* SAMSUNG_KEYIFCOL */
49 #define SAMSUNG_KEYIFCOL_MASK (0xff << 0)
50 #define S5PV210_KEYIFCOLEN_MASK (0xff << 8)
51
52 /* SAMSUNG_KEYIFROW */
53 #define SAMSUNG_KEYIFROW_MASK (0xff << 0)
54 #define S5PV210_KEYIFROW_MASK (0x3fff << 0)
55
56 /* SAMSUNG_KEYIFFC */
57 #define SAMSUNG_KEYIFFC_MASK (0x3ff << 0)
58
59 enum samsung_keypad_type {
60 KEYPAD_TYPE_SAMSUNG,
61 KEYPAD_TYPE_S5PV210,
62 };
63
64 struct samsung_keypad {
65 struct input_dev *input_dev;
66 struct clk *clk;
67 void __iomem *base;
68 wait_queue_head_t wait;
69 bool stopped;
70 int irq;
71 unsigned int row_shift;
72 unsigned int rows;
73 unsigned int cols;
74 unsigned int row_state[SAMSUNG_MAX_COLS];
75 unsigned short keycodes[];
76 };
77
78 static int samsung_keypad_is_s5pv210(struct device *dev)
79 {
80 struct platform_device *pdev = to_platform_device(dev);
81 enum samsung_keypad_type type =
82 platform_get_device_id(pdev)->driver_data;
83
84 return type == KEYPAD_TYPE_S5PV210;
85 }
86
87 static void samsung_keypad_scan(struct samsung_keypad *keypad,
88 unsigned int *row_state)
89 {
90 struct device *dev = keypad->input_dev->dev.parent;
91 unsigned int col;
92 unsigned int val;
93
94 for (col = 0; col < keypad->cols; col++) {
95 if (samsung_keypad_is_s5pv210(dev)) {
96 val = S5PV210_KEYIFCOLEN_MASK;
97 val &= ~(1 << col) << 8;
98 } else {
99 val = SAMSUNG_KEYIFCOL_MASK;
100 val &= ~(1 << col);
101 }
102
103 writel(val, keypad->base + SAMSUNG_KEYIFCOL);
104 mdelay(1);
105
106 val = readl(keypad->base + SAMSUNG_KEYIFROW);
107 row_state[col] = ~val & ((1 << keypad->rows) - 1);
108 }
109
110 /* KEYIFCOL reg clear */
111 writel(0, keypad->base + SAMSUNG_KEYIFCOL);
112 }
113
114 static bool samsung_keypad_report(struct samsung_keypad *keypad,
115 unsigned int *row_state)
116 {
117 struct input_dev *input_dev = keypad->input_dev;
118 unsigned int changed;
119 unsigned int pressed;
120 unsigned int key_down = 0;
121 unsigned int val;
122 unsigned int col, row;
123
124 for (col = 0; col < keypad->cols; col++) {
125 changed = row_state[col] ^ keypad->row_state[col];
126 key_down |= row_state[col];
127 if (!changed)
128 continue;
129
130 for (row = 0; row < keypad->rows; row++) {
131 if (!(changed & (1 << row)))
132 continue;
133
134 pressed = row_state[col] & (1 << row);
135
136 dev_dbg(&keypad->input_dev->dev,
137 "key %s, row: %d, col: %d\n",
138 pressed ? "pressed" : "released", row, col);
139
140 val = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
141
142 input_event(input_dev, EV_MSC, MSC_SCAN, val);
143 input_report_key(input_dev,
144 keypad->keycodes[val], pressed);
145 }
146 input_sync(keypad->input_dev);
147 }
148
149 memcpy(keypad->row_state, row_state, sizeof(keypad->row_state));
150
151 return key_down;
152 }
153
154 static irqreturn_t samsung_keypad_irq(int irq, void *dev_id)
155 {
156 struct samsung_keypad *keypad = dev_id;
157 unsigned int row_state[SAMSUNG_MAX_COLS];
158 unsigned int val;
159 bool key_down;
160
161 do {
162 val = readl(keypad->base + SAMSUNG_KEYIFSTSCLR);
163 /* Clear interrupt. */
164 writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
165
166 samsung_keypad_scan(keypad, row_state);
167
168 key_down = samsung_keypad_report(keypad, row_state);
169 if (key_down)
170 wait_event_timeout(keypad->wait, keypad->stopped,
171 msecs_to_jiffies(50));
172
173 } while (key_down && !keypad->stopped);
174
175 return IRQ_HANDLED;
176 }
177
178 static void samsung_keypad_start(struct samsung_keypad *keypad)
179 {
180 unsigned int val;
181
182 /* Tell IRQ thread that it may poll the device. */
183 keypad->stopped = false;
184
185 clk_enable(keypad->clk);
186
187 /* Enable interrupt bits. */
188 val = readl(keypad->base + SAMSUNG_KEYIFCON);
189 val |= SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN;
190 writel(val, keypad->base + SAMSUNG_KEYIFCON);
191
192 /* KEYIFCOL reg clear. */
193 writel(0, keypad->base + SAMSUNG_KEYIFCOL);
194 }
195
196 static void samsung_keypad_stop(struct samsung_keypad *keypad)
197 {
198 unsigned int val;
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
222 static int samsung_keypad_open(struct input_dev *input_dev)
223 {
224 struct samsung_keypad *keypad = input_get_drvdata(input_dev);
225
226 samsung_keypad_start(keypad);
227
228 return 0;
229 }
230
231 static void samsung_keypad_close(struct input_dev *input_dev)
232 {
233 struct samsung_keypad *keypad = input_get_drvdata(input_dev);
234
235 samsung_keypad_stop(keypad);
236 }
237
238 static int __devinit samsung_keypad_probe(struct platform_device *pdev)
239 {
240 const struct samsung_keypad_platdata *pdata;
241 const struct matrix_keymap_data *keymap_data;
242 struct samsung_keypad *keypad;
243 struct resource *res;
244 struct input_dev *input_dev;
245 unsigned int row_shift;
246 unsigned int keymap_size;
247 int error;
248
249 pdata = pdev->dev.platform_data;
250 if (!pdata) {
251 dev_err(&pdev->dev, "no platform data defined\n");
252 return -EINVAL;
253 }
254
255 keymap_data = pdata->keymap_data;
256 if (!keymap_data) {
257 dev_err(&pdev->dev, "no keymap data defined\n");
258 return -EINVAL;
259 }
260
261 if (!pdata->rows || pdata->rows > SAMSUNG_MAX_ROWS)
262 return -EINVAL;
263
264 if (!pdata->cols || pdata->cols > SAMSUNG_MAX_COLS)
265 return -EINVAL;
266
267 /* initialize the gpio */
268 if (pdata->cfg_gpio)
269 pdata->cfg_gpio(pdata->rows, pdata->cols);
270
271 row_shift = get_count_order(pdata->cols);
272 keymap_size = (pdata->rows << row_shift) * sizeof(keypad->keycodes[0]);
273
274 keypad = kzalloc(sizeof(*keypad) + keymap_size, GFP_KERNEL);
275 input_dev = input_allocate_device();
276 if (!keypad || !input_dev) {
277 error = -ENOMEM;
278 goto err_free_mem;
279 }
280
281 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
282 if (!res) {
283 error = -ENODEV;
284 goto err_free_mem;
285 }
286
287 keypad->base = ioremap(res->start, resource_size(res));
288 if (!keypad->base) {
289 error = -EBUSY;
290 goto err_free_mem;
291 }
292
293 keypad->clk = clk_get(&pdev->dev, "keypad");
294 if (IS_ERR(keypad->clk)) {
295 dev_err(&pdev->dev, "failed to get keypad clk\n");
296 error = PTR_ERR(keypad->clk);
297 goto err_unmap_base;
298 }
299
300 keypad->input_dev = input_dev;
301 keypad->row_shift = row_shift;
302 keypad->rows = pdata->rows;
303 keypad->cols = pdata->cols;
304 init_waitqueue_head(&keypad->wait);
305
306 input_dev->name = pdev->name;
307 input_dev->id.bustype = BUS_HOST;
308 input_dev->dev.parent = &pdev->dev;
309 input_set_drvdata(input_dev, keypad);
310
311 input_dev->open = samsung_keypad_open;
312 input_dev->close = samsung_keypad_close;
313
314 input_dev->evbit[0] = BIT_MASK(EV_KEY);
315 if (!pdata->no_autorepeat)
316 input_dev->evbit[0] |= BIT_MASK(EV_REP);
317
318 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
319
320 input_dev->keycode = keypad->keycodes;
321 input_dev->keycodesize = sizeof(keypad->keycodes[0]);
322 input_dev->keycodemax = pdata->rows << row_shift;
323
324 matrix_keypad_build_keymap(keymap_data, row_shift,
325 input_dev->keycode, input_dev->keybit);
326
327 keypad->irq = platform_get_irq(pdev, 0);
328 if (keypad->irq < 0) {
329 error = keypad->irq;
330 goto err_put_clk;
331 }
332
333 error = request_threaded_irq(keypad->irq, NULL, samsung_keypad_irq,
334 IRQF_ONESHOT, dev_name(&pdev->dev), keypad);
335 if (error) {
336 dev_err(&pdev->dev, "failed to register keypad interrupt\n");
337 goto err_put_clk;
338 }
339
340 error = input_register_device(keypad->input_dev);
341 if (error)
342 goto err_free_irq;
343
344 device_init_wakeup(&pdev->dev, pdata->wakeup);
345 platform_set_drvdata(pdev, keypad);
346 return 0;
347
348 err_free_irq:
349 free_irq(keypad->irq, keypad);
350 err_put_clk:
351 clk_put(keypad->clk);
352 err_unmap_base:
353 iounmap(keypad->base);
354 err_free_mem:
355 input_free_device(input_dev);
356 kfree(keypad);
357
358 return error;
359 }
360
361 static int __devexit samsung_keypad_remove(struct platform_device *pdev)
362 {
363 struct samsung_keypad *keypad = platform_get_drvdata(pdev);
364
365 device_init_wakeup(&pdev->dev, 0);
366 platform_set_drvdata(pdev, NULL);
367
368 input_unregister_device(keypad->input_dev);
369
370 /*
371 * It is safe to free IRQ after unregistering device because
372 * samsung_keypad_close will shut off interrupts.
373 */
374 free_irq(keypad->irq, keypad);
375
376 clk_put(keypad->clk);
377
378 iounmap(keypad->base);
379 kfree(keypad);
380
381 return 0;
382 }
383
384 #ifdef CONFIG_PM
385 static void samsung_keypad_toggle_wakeup(struct samsung_keypad *keypad,
386 bool enable)
387 {
388 struct device *dev = keypad->input_dev->dev.parent;
389 unsigned int val;
390
391 clk_enable(keypad->clk);
392
393 val = readl(keypad->base + SAMSUNG_KEYIFCON);
394 if (enable) {
395 val |= SAMSUNG_KEYIFCON_WAKEUPEN;
396 if (device_may_wakeup(dev))
397 enable_irq_wake(keypad->irq);
398 } else {
399 val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
400 if (device_may_wakeup(dev))
401 disable_irq_wake(keypad->irq);
402 }
403 writel(val, keypad->base + SAMSUNG_KEYIFCON);
404
405 clk_disable(keypad->clk);
406 }
407
408 static int samsung_keypad_suspend(struct device *dev)
409 {
410 struct platform_device *pdev = to_platform_device(dev);
411 struct samsung_keypad *keypad = platform_get_drvdata(pdev);
412 struct input_dev *input_dev = keypad->input_dev;
413
414 mutex_lock(&input_dev->mutex);
415
416 if (input_dev->users)
417 samsung_keypad_stop(keypad);
418
419 samsung_keypad_toggle_wakeup(keypad, true);
420
421 mutex_unlock(&input_dev->mutex);
422
423 return 0;
424 }
425
426 static int samsung_keypad_resume(struct device *dev)
427 {
428 struct platform_device *pdev = to_platform_device(dev);
429 struct samsung_keypad *keypad = platform_get_drvdata(pdev);
430 struct input_dev *input_dev = keypad->input_dev;
431
432 mutex_lock(&input_dev->mutex);
433
434 samsung_keypad_toggle_wakeup(keypad, false);
435
436 if (input_dev->users)
437 samsung_keypad_start(keypad);
438
439 mutex_unlock(&input_dev->mutex);
440
441 return 0;
442 }
443
444 static const struct dev_pm_ops samsung_keypad_pm_ops = {
445 .suspend = samsung_keypad_suspend,
446 .resume = samsung_keypad_resume,
447 };
448 #endif
449
450 static struct platform_device_id samsung_keypad_driver_ids[] = {
451 {
452 .name = "samsung-keypad",
453 .driver_data = KEYPAD_TYPE_SAMSUNG,
454 }, {
455 .name = "s5pv210-keypad",
456 .driver_data = KEYPAD_TYPE_S5PV210,
457 },
458 { },
459 };
460 MODULE_DEVICE_TABLE(platform, samsung_keypad_driver_ids);
461
462 static struct platform_driver samsung_keypad_driver = {
463 .probe = samsung_keypad_probe,
464 .remove = __devexit_p(samsung_keypad_remove),
465 .driver = {
466 .name = "samsung-keypad",
467 .owner = THIS_MODULE,
468 #ifdef CONFIG_PM
469 .pm = &samsung_keypad_pm_ops,
470 #endif
471 },
472 .id_table = samsung_keypad_driver_ids,
473 };
474
475 static int __init samsung_keypad_init(void)
476 {
477 return platform_driver_register(&samsung_keypad_driver);
478 }
479 module_init(samsung_keypad_init);
480
481 static void __exit samsung_keypad_exit(void)
482 {
483 platform_driver_unregister(&samsung_keypad_driver);
484 }
485 module_exit(samsung_keypad_exit);
486
487 MODULE_DESCRIPTION("Samsung keypad driver");
488 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
489 MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
490 MODULE_LICENSE("GPL");
491 MODULE_ALIAS("platform:samsung-keypad");
CRIS linux kernel tree