Commit | Line | Data |
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bab7614d EM |
1 | /* |
2 | * GPIO driven matrix keyboard driver | |
3 | * | |
4 | * Copyright (c) 2008 Marek Vasut <marek.vasut@gmail.com> | |
5 | * | |
6 | * Based on corgikbd.c | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/types.h> | |
15 | #include <linux/delay.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/input.h> | |
19 | #include <linux/irq.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/jiffies.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/gpio.h> | |
24 | #include <linux/input/matrix_keypad.h> | |
5a0e3ad6 | 25 | #include <linux/slab.h> |
bab7614d EM |
26 | |
27 | struct matrix_keypad { | |
28 | const struct matrix_keypad_platform_data *pdata; | |
29 | struct input_dev *input_dev; | |
d82f1c35 | 30 | unsigned int row_shift; |
bab7614d | 31 | |
dd219234 DT |
32 | DECLARE_BITMAP(disabled_gpios, MATRIX_MAX_ROWS); |
33 | ||
bab7614d EM |
34 | uint32_t last_key_state[MATRIX_MAX_COLS]; |
35 | struct delayed_work work; | |
dd219234 | 36 | spinlock_t lock; |
bab7614d EM |
37 | bool scan_pending; |
38 | bool stopped; | |
fb76dd10 | 39 | bool gpio_all_disabled; |
01111fcd DT |
40 | |
41 | unsigned short keycodes[]; | |
bab7614d EM |
42 | }; |
43 | ||
44 | /* | |
45 | * NOTE: normally the GPIO has to be put into HiZ when de-activated to cause | |
46 | * minmal side effect when scanning other columns, here it is configured to | |
47 | * be input, and it should work on most platforms. | |
48 | */ | |
49 | static void __activate_col(const struct matrix_keypad_platform_data *pdata, | |
50 | int col, bool on) | |
51 | { | |
52 | bool level_on = !pdata->active_low; | |
53 | ||
54 | if (on) { | |
55 | gpio_direction_output(pdata->col_gpios[col], level_on); | |
56 | } else { | |
57 | gpio_set_value_cansleep(pdata->col_gpios[col], !level_on); | |
58 | gpio_direction_input(pdata->col_gpios[col]); | |
59 | } | |
60 | } | |
61 | ||
62 | static void activate_col(const struct matrix_keypad_platform_data *pdata, | |
63 | int col, bool on) | |
64 | { | |
65 | __activate_col(pdata, col, on); | |
66 | ||
67 | if (on && pdata->col_scan_delay_us) | |
68 | udelay(pdata->col_scan_delay_us); | |
69 | } | |
70 | ||
71 | static void activate_all_cols(const struct matrix_keypad_platform_data *pdata, | |
72 | bool on) | |
73 | { | |
74 | int col; | |
75 | ||
76 | for (col = 0; col < pdata->num_col_gpios; col++) | |
77 | __activate_col(pdata, col, on); | |
78 | } | |
79 | ||
80 | static bool row_asserted(const struct matrix_keypad_platform_data *pdata, | |
81 | int row) | |
82 | { | |
83 | return gpio_get_value_cansleep(pdata->row_gpios[row]) ? | |
84 | !pdata->active_low : pdata->active_low; | |
85 | } | |
86 | ||
87 | static void enable_row_irqs(struct matrix_keypad *keypad) | |
88 | { | |
89 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; | |
90 | int i; | |
91 | ||
fb76dd10 LF |
92 | if (pdata->clustered_irq > 0) |
93 | enable_irq(pdata->clustered_irq); | |
94 | else { | |
95 | for (i = 0; i < pdata->num_row_gpios; i++) | |
96 | enable_irq(gpio_to_irq(pdata->row_gpios[i])); | |
97 | } | |
bab7614d EM |
98 | } |
99 | ||
100 | static void disable_row_irqs(struct matrix_keypad *keypad) | |
101 | { | |
102 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; | |
103 | int i; | |
104 | ||
fb76dd10 LF |
105 | if (pdata->clustered_irq > 0) |
106 | disable_irq_nosync(pdata->clustered_irq); | |
107 | else { | |
108 | for (i = 0; i < pdata->num_row_gpios; i++) | |
109 | disable_irq_nosync(gpio_to_irq(pdata->row_gpios[i])); | |
110 | } | |
bab7614d EM |
111 | } |
112 | ||
113 | /* | |
114 | * This gets the keys from keyboard and reports it to input subsystem | |
115 | */ | |
116 | static void matrix_keypad_scan(struct work_struct *work) | |
117 | { | |
118 | struct matrix_keypad *keypad = | |
119 | container_of(work, struct matrix_keypad, work.work); | |
120 | struct input_dev *input_dev = keypad->input_dev; | |
121 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; | |
122 | uint32_t new_state[MATRIX_MAX_COLS]; | |
123 | int row, col, code; | |
124 | ||
125 | /* de-activate all columns for scanning */ | |
126 | activate_all_cols(pdata, false); | |
127 | ||
128 | memset(new_state, 0, sizeof(new_state)); | |
129 | ||
130 | /* assert each column and read the row status out */ | |
131 | for (col = 0; col < pdata->num_col_gpios; col++) { | |
132 | ||
133 | activate_col(pdata, col, true); | |
134 | ||
135 | for (row = 0; row < pdata->num_row_gpios; row++) | |
136 | new_state[col] |= | |
137 | row_asserted(pdata, row) ? (1 << row) : 0; | |
138 | ||
139 | activate_col(pdata, col, false); | |
140 | } | |
141 | ||
142 | for (col = 0; col < pdata->num_col_gpios; col++) { | |
143 | uint32_t bits_changed; | |
144 | ||
145 | bits_changed = keypad->last_key_state[col] ^ new_state[col]; | |
146 | if (bits_changed == 0) | |
147 | continue; | |
148 | ||
149 | for (row = 0; row < pdata->num_row_gpios; row++) { | |
150 | if ((bits_changed & (1 << row)) == 0) | |
151 | continue; | |
152 | ||
d82f1c35 | 153 | code = MATRIX_SCAN_CODE(row, col, keypad->row_shift); |
bab7614d EM |
154 | input_event(input_dev, EV_MSC, MSC_SCAN, code); |
155 | input_report_key(input_dev, | |
156 | keypad->keycodes[code], | |
157 | new_state[col] & (1 << row)); | |
158 | } | |
159 | } | |
160 | input_sync(input_dev); | |
161 | ||
162 | memcpy(keypad->last_key_state, new_state, sizeof(new_state)); | |
163 | ||
164 | activate_all_cols(pdata, true); | |
165 | ||
166 | /* Enable IRQs again */ | |
167 | spin_lock_irq(&keypad->lock); | |
168 | keypad->scan_pending = false; | |
169 | enable_row_irqs(keypad); | |
170 | spin_unlock_irq(&keypad->lock); | |
171 | } | |
172 | ||
173 | static irqreturn_t matrix_keypad_interrupt(int irq, void *id) | |
174 | { | |
175 | struct matrix_keypad *keypad = id; | |
176 | unsigned long flags; | |
177 | ||
178 | spin_lock_irqsave(&keypad->lock, flags); | |
179 | ||
180 | /* | |
181 | * See if another IRQ beaten us to it and scheduled the | |
182 | * scan already. In that case we should not try to | |
183 | * disable IRQs again. | |
184 | */ | |
185 | if (unlikely(keypad->scan_pending || keypad->stopped)) | |
186 | goto out; | |
187 | ||
188 | disable_row_irqs(keypad); | |
189 | keypad->scan_pending = true; | |
190 | schedule_delayed_work(&keypad->work, | |
191 | msecs_to_jiffies(keypad->pdata->debounce_ms)); | |
192 | ||
193 | out: | |
194 | spin_unlock_irqrestore(&keypad->lock, flags); | |
195 | return IRQ_HANDLED; | |
196 | } | |
197 | ||
198 | static int matrix_keypad_start(struct input_dev *dev) | |
199 | { | |
200 | struct matrix_keypad *keypad = input_get_drvdata(dev); | |
201 | ||
202 | keypad->stopped = false; | |
203 | mb(); | |
204 | ||
205 | /* | |
206 | * Schedule an immediate key scan to capture current key state; | |
207 | * columns will be activated and IRQs be enabled after the scan. | |
208 | */ | |
209 | schedule_delayed_work(&keypad->work, 0); | |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
214 | static void matrix_keypad_stop(struct input_dev *dev) | |
215 | { | |
216 | struct matrix_keypad *keypad = input_get_drvdata(dev); | |
217 | ||
218 | keypad->stopped = true; | |
219 | mb(); | |
220 | flush_work(&keypad->work.work); | |
221 | /* | |
222 | * matrix_keypad_scan() will leave IRQs enabled; | |
223 | * we should disable them now. | |
224 | */ | |
225 | disable_row_irqs(keypad); | |
226 | } | |
227 | ||
0508c19a | 228 | #ifdef CONFIG_PM_SLEEP |
fb76dd10 | 229 | static void matrix_keypad_enable_wakeup(struct matrix_keypad *keypad) |
bab7614d | 230 | { |
bab7614d | 231 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; |
fb76dd10 | 232 | unsigned int gpio; |
bab7614d EM |
233 | int i; |
234 | ||
fb76dd10 LF |
235 | if (pdata->clustered_irq > 0) { |
236 | if (enable_irq_wake(pdata->clustered_irq) == 0) | |
237 | keypad->gpio_all_disabled = true; | |
238 | } else { | |
bab7614d | 239 | |
dd219234 DT |
240 | for (i = 0; i < pdata->num_row_gpios; i++) { |
241 | if (!test_bit(i, keypad->disabled_gpios)) { | |
fb76dd10 | 242 | gpio = pdata->row_gpios[i]; |
dd219234 DT |
243 | |
244 | if (enable_irq_wake(gpio_to_irq(gpio)) == 0) | |
245 | __set_bit(i, keypad->disabled_gpios); | |
246 | } | |
247 | } | |
248 | } | |
bab7614d EM |
249 | } |
250 | ||
fb76dd10 | 251 | static void matrix_keypad_disable_wakeup(struct matrix_keypad *keypad) |
bab7614d | 252 | { |
bab7614d | 253 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; |
fb76dd10 | 254 | unsigned int gpio; |
bab7614d EM |
255 | int i; |
256 | ||
fb76dd10 LF |
257 | if (pdata->clustered_irq > 0) { |
258 | if (keypad->gpio_all_disabled) { | |
259 | disable_irq_wake(pdata->clustered_irq); | |
260 | keypad->gpio_all_disabled = false; | |
261 | } | |
262 | } else { | |
dd219234 DT |
263 | for (i = 0; i < pdata->num_row_gpios; i++) { |
264 | if (test_and_clear_bit(i, keypad->disabled_gpios)) { | |
fb76dd10 | 265 | gpio = pdata->row_gpios[i]; |
dd219234 DT |
266 | disable_irq_wake(gpio_to_irq(gpio)); |
267 | } | |
268 | } | |
269 | } | |
fb76dd10 LF |
270 | } |
271 | ||
272 | static int matrix_keypad_suspend(struct device *dev) | |
273 | { | |
274 | struct platform_device *pdev = to_platform_device(dev); | |
275 | struct matrix_keypad *keypad = platform_get_drvdata(pdev); | |
276 | ||
277 | matrix_keypad_stop(keypad->input_dev); | |
278 | ||
279 | if (device_may_wakeup(&pdev->dev)) | |
280 | matrix_keypad_enable_wakeup(keypad); | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
285 | static int matrix_keypad_resume(struct device *dev) | |
286 | { | |
287 | struct platform_device *pdev = to_platform_device(dev); | |
288 | struct matrix_keypad *keypad = platform_get_drvdata(pdev); | |
289 | ||
290 | if (device_may_wakeup(&pdev->dev)) | |
291 | matrix_keypad_disable_wakeup(keypad); | |
bab7614d EM |
292 | |
293 | matrix_keypad_start(keypad->input_dev); | |
294 | ||
295 | return 0; | |
296 | } | |
bab7614d EM |
297 | #endif |
298 | ||
0508c19a DT |
299 | static SIMPLE_DEV_PM_OPS(matrix_keypad_pm_ops, |
300 | matrix_keypad_suspend, matrix_keypad_resume); | |
301 | ||
b83643eb DT |
302 | static int __devinit matrix_keypad_init_gpio(struct platform_device *pdev, |
303 | struct matrix_keypad *keypad) | |
bab7614d EM |
304 | { |
305 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; | |
b83643eb | 306 | int i, err; |
bab7614d EM |
307 | |
308 | /* initialized strobe lines as outputs, activated */ | |
309 | for (i = 0; i < pdata->num_col_gpios; i++) { | |
310 | err = gpio_request(pdata->col_gpios[i], "matrix_kbd_col"); | |
311 | if (err) { | |
312 | dev_err(&pdev->dev, | |
313 | "failed to request GPIO%d for COL%d\n", | |
314 | pdata->col_gpios[i], i); | |
315 | goto err_free_cols; | |
316 | } | |
317 | ||
318 | gpio_direction_output(pdata->col_gpios[i], !pdata->active_low); | |
319 | } | |
320 | ||
321 | for (i = 0; i < pdata->num_row_gpios; i++) { | |
322 | err = gpio_request(pdata->row_gpios[i], "matrix_kbd_row"); | |
323 | if (err) { | |
324 | dev_err(&pdev->dev, | |
325 | "failed to request GPIO%d for ROW%d\n", | |
326 | pdata->row_gpios[i], i); | |
327 | goto err_free_rows; | |
328 | } | |
329 | ||
330 | gpio_direction_input(pdata->row_gpios[i]); | |
331 | } | |
332 | ||
fb76dd10 LF |
333 | if (pdata->clustered_irq > 0) { |
334 | err = request_irq(pdata->clustered_irq, | |
bab7614d | 335 | matrix_keypad_interrupt, |
fb76dd10 | 336 | pdata->clustered_irq_flags, |
bab7614d EM |
337 | "matrix-keypad", keypad); |
338 | if (err) { | |
339 | dev_err(&pdev->dev, | |
fb76dd10 LF |
340 | "Unable to acquire clustered interrupt\n"); |
341 | goto err_free_rows; | |
342 | } | |
343 | } else { | |
344 | for (i = 0; i < pdata->num_row_gpios; i++) { | |
345 | err = request_irq(gpio_to_irq(pdata->row_gpios[i]), | |
346 | matrix_keypad_interrupt, | |
fb76dd10 LF |
347 | IRQF_TRIGGER_RISING | |
348 | IRQF_TRIGGER_FALLING, | |
349 | "matrix-keypad", keypad); | |
350 | if (err) { | |
351 | dev_err(&pdev->dev, | |
b83643eb | 352 | "Unable to acquire interrupt for GPIO line %i\n", |
fb76dd10 LF |
353 | pdata->row_gpios[i]); |
354 | goto err_free_irqs; | |
355 | } | |
bab7614d EM |
356 | } |
357 | } | |
358 | ||
359 | /* initialized as disabled - enabled by input->open */ | |
360 | disable_row_irqs(keypad); | |
361 | return 0; | |
362 | ||
363 | err_free_irqs: | |
364 | while (--i >= 0) | |
365 | free_irq(gpio_to_irq(pdata->row_gpios[i]), keypad); | |
366 | i = pdata->num_row_gpios; | |
367 | err_free_rows: | |
368 | while (--i >= 0) | |
369 | gpio_free(pdata->row_gpios[i]); | |
370 | i = pdata->num_col_gpios; | |
371 | err_free_cols: | |
372 | while (--i >= 0) | |
373 | gpio_free(pdata->col_gpios[i]); | |
374 | ||
375 | return err; | |
376 | } | |
377 | ||
b83643eb DT |
378 | static void matrix_keypad_free_gpio(struct matrix_keypad *keypad) |
379 | { | |
380 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; | |
381 | int i; | |
382 | ||
383 | if (pdata->clustered_irq > 0) { | |
384 | free_irq(pdata->clustered_irq, keypad); | |
385 | } else { | |
386 | for (i = 0; i < pdata->num_row_gpios; i++) | |
387 | free_irq(gpio_to_irq(pdata->row_gpios[i]), keypad); | |
388 | } | |
389 | ||
390 | for (i = 0; i < pdata->num_row_gpios; i++) | |
391 | gpio_free(pdata->row_gpios[i]); | |
392 | ||
393 | for (i = 0; i < pdata->num_col_gpios; i++) | |
394 | gpio_free(pdata->col_gpios[i]); | |
395 | } | |
396 | ||
bab7614d EM |
397 | static int __devinit matrix_keypad_probe(struct platform_device *pdev) |
398 | { | |
399 | const struct matrix_keypad_platform_data *pdata; | |
400 | const struct matrix_keymap_data *keymap_data; | |
401 | struct matrix_keypad *keypad; | |
402 | struct input_dev *input_dev; | |
d82f1c35 | 403 | unsigned int row_shift; |
01111fcd | 404 | size_t keymap_size; |
bab7614d EM |
405 | int err; |
406 | ||
407 | pdata = pdev->dev.platform_data; | |
408 | if (!pdata) { | |
409 | dev_err(&pdev->dev, "no platform data defined\n"); | |
410 | return -EINVAL; | |
411 | } | |
412 | ||
413 | keymap_data = pdata->keymap_data; | |
414 | if (!keymap_data) { | |
415 | dev_err(&pdev->dev, "no keymap data defined\n"); | |
416 | return -EINVAL; | |
417 | } | |
418 | ||
d82f1c35 | 419 | row_shift = get_count_order(pdata->num_col_gpios); |
01111fcd DT |
420 | keymap_size = (pdata->num_row_gpios << row_shift) * |
421 | sizeof(keypad->keycodes[0]); | |
422 | keypad = kzalloc(sizeof(struct matrix_keypad) + keymap_size, | |
423 | GFP_KERNEL); | |
bab7614d | 424 | input_dev = input_allocate_device(); |
01111fcd | 425 | if (!keypad || !input_dev) { |
bab7614d EM |
426 | err = -ENOMEM; |
427 | goto err_free_mem; | |
428 | } | |
429 | ||
430 | keypad->input_dev = input_dev; | |
431 | keypad->pdata = pdata; | |
d82f1c35 | 432 | keypad->row_shift = row_shift; |
bab7614d EM |
433 | keypad->stopped = true; |
434 | INIT_DELAYED_WORK(&keypad->work, matrix_keypad_scan); | |
435 | spin_lock_init(&keypad->lock); | |
436 | ||
437 | input_dev->name = pdev->name; | |
438 | input_dev->id.bustype = BUS_HOST; | |
439 | input_dev->dev.parent = &pdev->dev; | |
bab7614d EM |
440 | input_dev->open = matrix_keypad_start; |
441 | input_dev->close = matrix_keypad_stop; | |
442 | ||
1932811f DT |
443 | err = matrix_keypad_build_keymap(keymap_data, NULL, |
444 | pdata->num_row_gpios, | |
445 | pdata->num_col_gpios, | |
446 | keypad->keycodes, input_dev); | |
447 | if (err) | |
448 | goto err_free_mem; | |
bab7614d | 449 | |
1932811f DT |
450 | if (!pdata->no_autorepeat) |
451 | __set_bit(EV_REP, input_dev->evbit); | |
bab7614d EM |
452 | input_set_capability(input_dev, EV_MSC, MSC_SCAN); |
453 | input_set_drvdata(input_dev, keypad); | |
454 | ||
b83643eb | 455 | err = matrix_keypad_init_gpio(pdev, keypad); |
bab7614d EM |
456 | if (err) |
457 | goto err_free_mem; | |
458 | ||
459 | err = input_register_device(keypad->input_dev); | |
460 | if (err) | |
b83643eb | 461 | goto err_free_gpio; |
bab7614d EM |
462 | |
463 | device_init_wakeup(&pdev->dev, pdata->wakeup); | |
464 | platform_set_drvdata(pdev, keypad); | |
465 | ||
466 | return 0; | |
467 | ||
b83643eb DT |
468 | err_free_gpio: |
469 | matrix_keypad_free_gpio(keypad); | |
bab7614d EM |
470 | err_free_mem: |
471 | input_free_device(input_dev); | |
bab7614d EM |
472 | kfree(keypad); |
473 | return err; | |
474 | } | |
475 | ||
476 | static int __devexit matrix_keypad_remove(struct platform_device *pdev) | |
477 | { | |
478 | struct matrix_keypad *keypad = platform_get_drvdata(pdev); | |
bab7614d EM |
479 | |
480 | device_init_wakeup(&pdev->dev, 0); | |
481 | ||
b83643eb | 482 | matrix_keypad_free_gpio(keypad); |
bab7614d | 483 | input_unregister_device(keypad->input_dev); |
bab7614d EM |
484 | kfree(keypad); |
485 | ||
b83643eb DT |
486 | platform_set_drvdata(pdev, NULL); |
487 | ||
bab7614d EM |
488 | return 0; |
489 | } | |
490 | ||
491 | static struct platform_driver matrix_keypad_driver = { | |
492 | .probe = matrix_keypad_probe, | |
493 | .remove = __devexit_p(matrix_keypad_remove), | |
bab7614d EM |
494 | .driver = { |
495 | .name = "matrix-keypad", | |
496 | .owner = THIS_MODULE, | |
f72a28ab | 497 | .pm = &matrix_keypad_pm_ops, |
bab7614d EM |
498 | }, |
499 | }; | |
5146c84f | 500 | module_platform_driver(matrix_keypad_driver); |
bab7614d EM |
501 | |
502 | MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); | |
503 | MODULE_DESCRIPTION("GPIO Driven Matrix Keypad Driver"); | |
504 | MODULE_LICENSE("GPL v2"); | |
505 | MODULE_ALIAS("platform:matrix-keypad"); |