OK6410矩陣鍵盤驅動 linux2.6.36

實現了4*4的矩陣鍵盤驅動，

參考文檔 http://www.linuxidc.com/Linux/2012-09/69904.htm

需要注明一點的是：

void samsung_keypad_cfg_gpio(unsigned int rows, unsigned int cols)函數的位置：

arch/arm/mach-s3c64xx/setup-keypad.c 修改方法如下：

1. voidsamsung_keypad_cfg_gpio(unsigned int rows, unsigned int cols)
3. {
5. unsignedint gpio;
7. unsignedint end;
12. /*Set all the necessary GPK pins to special-function 3: KP_ROW[x] */
14. end= S3C64XX_GPK(8 + rows);
16. for(gpio = S3C64XX_GPK(8); gpio < end; gpio++) {
18. s3c_gpio_cfgpin(gpio,S3C_GPIO_SFN(3));
20. s3c_gpio_setpull(gpio,S3C_GPIO_PULL_NONE);
22. }
26. /*Set all the necessary GPL pins to special-function 3: KP_COL[x] */
28. end= S3C64XX_GPL(0 + cols);
30. for(gpio = S3C64XX_GPL(0); gpio < end; gpio++) {
32. s3c_gpio_cfgpin(gpio,S3C_GPIO_SFN(3));
34. s3c_gpio_setpull(gpio,S3C_GPIO_PULL_NONE);
36. }
38. }
40. 其中S3C_GPIO_PULL_NONE需要改成S3C_GPIO_PULL_UP

此外，還需要修改一點，代碼原先為2*8的矩陣鍵盤，需修改為4*4的矩陣鍵盤

在arch/arm/mach-s3c64xx/mach-smdk6410.c中，在380行中修改為如下：

1. static struct samsung_keypad_platdata smdk6410_keypad_data _initdata={
3. .keymap_data = & smdk6410_keymap_data,
5. .rows = 4,
7. .cols = 4,
9. };

整個代碼如下：

samsung-keypad,c :

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. */
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>
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
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)
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
48. /* SAMSUNG_KEYIFCOL */
49. #define SAMSUNG_KEYIFCOL_MASK (0xff << 0)
50. #define S5PV210_KEYIFCOLEN_MASK (0xff << 8)
52. unsigned int keypad_keycode[] = {'1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G'};
54. /* SAMSUNG_KEYIFROW */
55. #define SAMSUNG_KEYIFROW_MASK (0xff << 0)
56. #define S5PV210_KEYIFROW_MASK (0x3fff << 0)
58. /* SAMSUNG_KEYIFFC */
59. #define SAMSUNG_KEYIFFC_MASK (0x3ff << 0)
63. enum samsung_keypad_type {
64. KEYPAD_TYPE_SAMSUNG,
65. KEYPAD_TYPE_S5PV210,
66. };
68. struct samsung_keypad {
69. struct input_dev *input_dev;
70. struct clk *clk;
71. void __iomem *base;
72. wait_queue_head_t wait;
73. bool stopped;
74. int irq;
75. unsigned int row_shift;
76. unsigned int rows;
77. unsigned int cols;
78. unsigned int row_state[SAMSUNG_MAX_COLS];
79. unsigned short keycodes[];
80. };
82. static int samsung_keypad_is_s5pv210(struct device *dev)
83. {
84. struct platform_device *pdev = to_platform_device(dev);
85. enum samsung_keypad_type type =
86. platform_get_device_id(pdev)->driver_data;
88. return type == KEYPAD_TYPE_S5PV210;
89. }
91. static void samsung_keypad_scan(struct samsung_keypad *keypad,
92. unsigned int *row_state)
93. {
94. // struct device *dev = keypad->input_dev->dev.parent;
95. unsigned int col;
96. unsigned int val;
98. // printk("<0>samsung_keypad_scan!\n");
100. for (col = 0; col < keypad->cols; col++) {
101. /*if (samsung_keypad_is_s5pv210(dev)) {
102. val = S5PV210_KEYIFCOLEN_MASK;
103. val &= ~(1 << col) << 8;
104. } else {*/
105. val = SAMSUNG_KEYIFCOL_MASK;
106. val &= ~(1 << col);
107. //}
109. writel(val, keypad->base + SAMSUNG_KEYIFCOL);
110. mdelay(1);
112. val = readl(keypad->base + SAMSUNG_KEYIFROW);
113. row_state[col] = ~val & ((1 << keypad->rows) - 1);
114. }
116. /* KEYIFCOL reg clear */
117. writel(0, keypad->base + SAMSUNG_KEYIFCOL);
118. }
120. static bool samsung_keypad_report(struct samsung_keypad *keypad,
121. unsigned int *row_state)
122. {
123. struct input_dev *input_dev = keypad->input_dev;
124. unsigned int changed;
125. unsigned int pressed;
126. unsigned int key_down = 0;
127. unsigned int val;
128. unsigned int col, row;
131. for (col = 0; col < keypad->cols; col++) {
132. changed = row_state[col] ^ keypad->row_state[col];
133. key_down |= row_state[col];
134. if (!changed)
135. continue;
137. for (row = 0; row < keypad->rows; row++) {
138. if (!(changed & (1 << row)))
139. continue;
141. pressed = row_state[col] & (1 << row);
143. printk("\n<0>samsung_keypad key %s,row:%d,col:%d\n"
144. ,(pressed ? "pressed":"released"),row,col );
146. dev_dbg(&keypad->input_dev->dev,
147. "key %s, row: %d, col: %d\n",
148. pressed ? "pressed" : "released", row, col);
150. val = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
152. input_event(input_dev, EV_MSC, MSC_SCAN, val);
153. input_report_key(input_dev,
154. keypad->keycodes[val], pressed);
155. }
156. input_sync(keypad->input_dev);
157. }
159. memcpy(keypad->row_state, row_state, sizeof(keypad->row_state));
161. return key_down;
162. }
164. static irqreturn_t samsung_keypad_irq(int irq, void *dev_id)
165. {
166. struct samsung_keypad *keypad = dev_id;
167. unsigned int row_state[SAMSUNG_MAX_COLS];
168. unsigned int val;
169. bool key_down;
171. do {
172. val = readl(keypad->base + SAMSUNG_KEYIFSTSCLR);
173. /* Clear interrupt. */
174. writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
176. samsung_keypad_scan(keypad, row_state);
178. key_down = samsung_keypad_report(keypad, row_state);
179. if (key_down)
180. wait_event_timeout(keypad->wait, keypad->stopped,
181. msecs_to_jiffies(50));
183. } while (key_down && !keypad->stopped);
185. return IRQ_HANDLED;
186. }
188. static void samsung_keypad_start(struct samsung_keypad *keypad)
189. {
190. unsigned int val;
192. /* Tell IRQ thread that it may poll the device. */
193. keypad->stopped = false;
195. clk_enable(keypad->clk);
197. /* Enable interrupt bits. */
198. val = readl(keypad->base + SAMSUNG_KEYIFCON);
199. val |= SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN;
200. writel(val, keypad->base + SAMSUNG_KEYIFCON);
202. /* KEYIFCOL reg clear. */
203. writel(0, keypad->base + SAMSUNG_KEYIFCOL);
204. }
206. static void samsung_keypad_stop(struct samsung_keypad *keypad)
207. {
208. unsigned int val;
210. /* Signal IRQ thread to stop polling and disable the handler. */
211. keypad->stopped = true;
212. wake_up(&keypad->wait);
213. disable_irq(keypad->irq);
215. /* Clear interrupt. */
216. writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
218. /* Disable interrupt bits. */
219. val = readl(keypad->base + SAMSUNG_KEYIFCON);
220. val &= ~(SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN);
221. writel(val, keypad->base + SAMSUNG_KEYIFCON);
223. clk_disable(keypad->clk);
225. /*
226. * Now that chip should not generate interrupts we can safely
227. * re-enable the handler.
228. */
229. enable_irq(keypad->irq);
230. }
232. static int samsung_keypad_open(struct input_dev *input_dev)
233. {
234. printk("<0>samsung_keypad_open!\n");
235. struct samsung_keypad *keypad = input_get_drvdata(input_dev);
237. samsung_keypad_start(keypad);
239. return 0;
240. }
242. static void samsung_keypad_close(struct input_dev *input_dev)
243. {
244. struct samsung_keypad *keypad = input_get_drvdata(input_dev);
246. samsung_keypad_stop(keypad);
247. }
249. static int __devinit samsung_keypad_probe(struct platform_device *pdev)
250. {
251. const struct samsung_keypad_platdata *pdata;
252. const struct matrix_keymap_data *keymap_data;
253. struct samsung_keypad *keypad;
254. struct resource *res;
255. struct input_dev *input_dev;
256. unsigned int row_shift;
257. unsigned int keymap_size;
258. int error;
260. unsigned int key=0;
261. unsigned int keycodes_size=sizeof(keypad_keycode)/sizeof(keypad_keycode[0]);
263. printk("<0>samsung_keypad_probe!\n");
265. pdata = pdev->dev.platform_data;
266. if (!pdata) {
267. dev_err(&pdev->dev, "no platform data defined\n");
268. return -EINVAL;
269. }
271. keymap_data = pdata->keymap_data;
272. if (!keymap_data) {
273. dev_err(&pdev->dev, "no keymap data defined\n");
274. return -EINVAL;
275. }
277. if (!pdata->rows || pdata->rows > SAMSUNG_MAX_ROWS)
278. return -EINVAL;
280. if (!pdata->cols || pdata->cols > SAMSUNG_MAX_COLS)
281. return -EINVAL;
283. /* initialize the gpio */
284. if (pdata->cfg_gpio)
285. pdata->cfg_gpio(pdata->rows, pdata->cols);
287. row_shift = get_count_order(pdata->cols);
288. keymap_size = (pdata->rows << row_shift) * sizeof(keypad->keycodes[0]);
290. keypad = kzalloc(sizeof(*keypad) + keymap_size, GFP_KERNEL);
291. input_dev = input_allocate_device();
292. if (!keypad || !input_dev) {
293. error = -ENOMEM;
294. goto err_free_mem;
295. }
297. res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
298. if (!res) {
299. error = -ENODEV;
300. goto err_free_mem;
301. }
303. keypad->base = ioremap(res->start, resource_size(res));
304. if (!keypad->base) {
305. error = -EBUSY;
306. goto err_free_mem;
307. }
309. keypad->clk = clk_get(&pdev->dev, "keypad");
310. if (IS_ERR(keypad->clk)) {
311. dev_err(&pdev->dev, "failed to get keypad clk\n");
312. error = PTR_ERR(keypad->clk);
313. goto err_unmap_base;
314. }
316. keypad->input_dev = input_dev;
317. keypad->row_shift = row_shift;
318. keypad->rows = pdata->rows;
319. keypad->cols = pdata->cols;
320. init_waitqueue_head(&keypad->wait);
322. input_dev->name = pdev->name;
323. input_dev->id.bustype = BUS_HOST;
324. input_dev->dev.parent = &pdev->dev;
325. input_set_drvdata(input_dev, keypad);
327. input_dev->open = samsung_keypad_open;
328. input_dev->close = samsung_keypad_close;
330. input_dev->evbit[0] = BIT_MASK(EV_KEY);
331. if (!pdata->no_autorepeat)
332. input_dev->evbit[0] |= BIT_MASK(EV_REP);
334. input_set_capability(input_dev, EV_MSC, MSC_SCAN);
336. input_dev->keycode = keypad->keycodes;
337. input_dev->keycodesize = sizeof(keypad->keycodes[0]);
338. input_dev->keycodemax = pdata->rows << row_shift;
340. /*matrix_keypad_build_keymap(keymap_data, row_shift,
341. input_dev->keycode, input_dev->keybit);*/
342. for(key=0;key<keycodes_size;key++){
343. int code=keypad->keycodes[key]=keypad_keycode[key];
344. if(code<=0)
345. continue;
346. __set_bit(code,input_dev->keybit);
347. }
348. __clear_bit(0,input_dev->keybit);
350. keypad->irq = platform_get_irq(pdev, 0);
351. if (keypad->irq < 0) {
352. error = keypad->irq;
353. goto err_put_clk;
354. }
356. error = request_threaded_irq(keypad->irq, NULL, samsung_keypad_irq,
357. IRQF_ONESHOT, dev_name(&pdev->dev), keypad);
358. if (error) {
359. dev_err(&pdev->dev, "failed to register keypad interrupt\n");
360. goto err_put_clk;
361. }
363. error = input_register_device(keypad->input_dev);
364. if (error)
365. goto err_free_irq;
367. device_init_wakeup(&pdev->dev, pdata->wakeup);
368. platform_set_drvdata(pdev, keypad);
369. return 0;
371. err_free_irq:
372. free_irq(keypad->irq, keypad);
373. err_put_clk:
374. clk_put(keypad->clk);
375. err_unmap_base:
376. iounmap(keypad->base);
377. err_free_mem:
378. input_free_device(input_dev);
379. kfree(keypad);
381. return error;
382. }
384. static int __devexit samsung_keypad_remove(struct platform_device *pdev)
385. {
386. struct samsung_keypad *keypad = platform_get_drvdata(pdev);
388. device_init_wakeup(&pdev->dev, 0);
389. platform_set_drvdata(pdev, NULL);
391. input_unregister_device(keypad->input_dev);
393. /*
394. * It is safe to free IRQ after unregistering device because
395. * samsung_keypad_close will shut off interrupts.
396. */
397. free_irq(keypad->irq, keypad);
399. clk_put(keypad->clk);
401. iounmap(keypad->base);
402. kfree(keypad);
404. return 0;
405. }
407. #ifdef CONFIG_PM
408. static void samsung_keypad_toggle_wakeup(struct samsung_keypad *keypad,
409. bool enable)
410. {
411. struct device *dev = keypad->input_dev->dev.parent;
412. unsigned int val;
414. clk_enable(keypad->clk);
416. val = readl(keypad->base + SAMSUNG_KEYIFCON);
417. if (enable) {
418. val |= SAMSUNG_KEYIFCON_WAKEUPEN;
419. if (device_may_wakeup(dev))
420. enable_irq_wake(keypad->irq);
421. } else {
422. val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
423. if (device_may_wakeup(dev))
424. disable_irq_wake(keypad->irq);
425. }
426. writel(val, keypad->base + SAMSUNG_KEYIFCON);
428. clk_disable(keypad->clk);
429. }
431. static int samsung_keypad_suspend(struct device *dev)
432. {
433. struct platform_device *pdev = to_platform_device(dev);
434. struct samsung_keypad *keypad = platform_get_drvdata(pdev);
435. struct input_dev *input_dev = keypad->input_dev;
437. mutex_lock(&input_dev->mutex);
439. if (input_dev->users)
440. samsung_keypad_stop(keypad);
442. samsung_keypad_toggle_wakeup(keypad, true);
444. mutex_unlock(&input_dev->mutex);
446. return 0;
447. }
449. static int samsung_keypad_resume(struct device *dev)
450. {
451. struct platform_device *pdev = to_platform_device(dev);
452. struct samsung_keypad *keypad = platform_get_drvdata(pdev);
453. struct input_dev *input_dev = keypad->input_dev;
455. mutex_lock(&input_dev->mutex);
457. samsung_keypad_toggle_wakeup(keypad, false);
459. if (input_dev->users)
460. samsung_keypad_start(keypad);
462. mutex_unlock(&input_dev->mutex);
464. return 0;
465. }
467. static const struct dev_pm_ops samsung_keypad_pm_ops = {
468. .suspend = samsung_keypad_suspend,
469. .resume = samsung_keypad_resume,
470. };
471. #endif
473. static struct platform_device_id samsung_keypad_driver_ids[] = {
474. {
475. .name = "samsung-keypad",
476. .driver_data = KEYPAD_TYPE_SAMSUNG,
477. }, {
478. .name = "s5pv210-keypad",
479. .driver_data = KEYPAD_TYPE_S5PV210,
480. },
481. { },
482. };
483. MODULE_DEVICE_TABLE(platform, samsung_keypad_driver_ids);
485. static struct platform_driver samsung_keypad_driver = {
486. .probe = samsung_keypad_probe,
487. .remove = __devexit_p(samsung_keypad_remove),
488. .driver = {
489. .name = "samsung-keypad",
490. .owner = THIS_MODULE,
491. #ifdef CONFIG_PM
492. .pm = &samsung_keypad_pm_ops,
493. #endif
494. },
495. .id_table = samsung_keypad_driver_ids,
496. };
498. static int __init samsung_keypad_init(void)
499. {
500. printk("<0>adc_drv_open and adc_init()\n");
501. return platform_driver_register(&samsung_keypad_driver);
502. }
503. module_init(samsung_keypad_init);
505. static void __exit samsung_keypad_exit(void)
506. {
507. platform_driver_unregister(&samsung_keypad_driver);
508. }
509. module_exit(samsung_keypad_exit);
511. MODULE_DESCRIPTION("Samsung keypad driver");
512. MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
513. MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
514. MODULE_LICENSE("GPL");
515. MODULE_ALIAS("platform:samsung-keypad");