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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> |
4a83eecf AC |
26 | #include <linux/of.h> |
27 | #include <linux/of_gpio.h> | |
28 | #include <linux/of_platform.h> | |
bab7614d EM |
29 | |
30 | struct matrix_keypad { | |
31 | const struct matrix_keypad_platform_data *pdata; | |
32 | struct input_dev *input_dev; | |
d82f1c35 | 33 | unsigned int row_shift; |
bab7614d | 34 | |
dd219234 DT |
35 | DECLARE_BITMAP(disabled_gpios, MATRIX_MAX_ROWS); |
36 | ||
bab7614d EM |
37 | uint32_t last_key_state[MATRIX_MAX_COLS]; |
38 | struct delayed_work work; | |
dd219234 | 39 | spinlock_t lock; |
bab7614d EM |
40 | bool scan_pending; |
41 | bool stopped; | |
fb76dd10 | 42 | bool gpio_all_disabled; |
bab7614d EM |
43 | }; |
44 | ||
45 | /* | |
46 | * NOTE: normally the GPIO has to be put into HiZ when de-activated to cause | |
47 | * minmal side effect when scanning other columns, here it is configured to | |
48 | * be input, and it should work on most platforms. | |
49 | */ | |
50 | static void __activate_col(const struct matrix_keypad_platform_data *pdata, | |
51 | int col, bool on) | |
52 | { | |
53 | bool level_on = !pdata->active_low; | |
54 | ||
55 | if (on) { | |
56 | gpio_direction_output(pdata->col_gpios[col], level_on); | |
57 | } else { | |
58 | gpio_set_value_cansleep(pdata->col_gpios[col], !level_on); | |
59 | gpio_direction_input(pdata->col_gpios[col]); | |
60 | } | |
61 | } | |
62 | ||
63 | static void activate_col(const struct matrix_keypad_platform_data *pdata, | |
64 | int col, bool on) | |
65 | { | |
66 | __activate_col(pdata, col, on); | |
67 | ||
68 | if (on && pdata->col_scan_delay_us) | |
69 | udelay(pdata->col_scan_delay_us); | |
70 | } | |
71 | ||
72 | static void activate_all_cols(const struct matrix_keypad_platform_data *pdata, | |
73 | bool on) | |
74 | { | |
75 | int col; | |
76 | ||
77 | for (col = 0; col < pdata->num_col_gpios; col++) | |
78 | __activate_col(pdata, col, on); | |
79 | } | |
80 | ||
81 | static bool row_asserted(const struct matrix_keypad_platform_data *pdata, | |
82 | int row) | |
83 | { | |
84 | return gpio_get_value_cansleep(pdata->row_gpios[row]) ? | |
85 | !pdata->active_low : pdata->active_low; | |
86 | } | |
87 | ||
88 | static void enable_row_irqs(struct matrix_keypad *keypad) | |
89 | { | |
90 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; | |
91 | int i; | |
92 | ||
fb76dd10 LF |
93 | if (pdata->clustered_irq > 0) |
94 | enable_irq(pdata->clustered_irq); | |
95 | else { | |
96 | for (i = 0; i < pdata->num_row_gpios; i++) | |
97 | enable_irq(gpio_to_irq(pdata->row_gpios[i])); | |
98 | } | |
bab7614d EM |
99 | } |
100 | ||
101 | static void disable_row_irqs(struct matrix_keypad *keypad) | |
102 | { | |
103 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; | |
104 | int i; | |
105 | ||
fb76dd10 LF |
106 | if (pdata->clustered_irq > 0) |
107 | disable_irq_nosync(pdata->clustered_irq); | |
108 | else { | |
109 | for (i = 0; i < pdata->num_row_gpios; i++) | |
110 | disable_irq_nosync(gpio_to_irq(pdata->row_gpios[i])); | |
111 | } | |
bab7614d EM |
112 | } |
113 | ||
114 | /* | |
115 | * This gets the keys from keyboard and reports it to input subsystem | |
116 | */ | |
117 | static void matrix_keypad_scan(struct work_struct *work) | |
118 | { | |
119 | struct matrix_keypad *keypad = | |
120 | container_of(work, struct matrix_keypad, work.work); | |
121 | struct input_dev *input_dev = keypad->input_dev; | |
4a83eecf | 122 | const unsigned short *keycodes = input_dev->keycode; |
bab7614d EM |
123 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; |
124 | uint32_t new_state[MATRIX_MAX_COLS]; | |
125 | int row, col, code; | |
126 | ||
127 | /* de-activate all columns for scanning */ | |
128 | activate_all_cols(pdata, false); | |
129 | ||
130 | memset(new_state, 0, sizeof(new_state)); | |
131 | ||
132 | /* assert each column and read the row status out */ | |
133 | for (col = 0; col < pdata->num_col_gpios; col++) { | |
134 | ||
135 | activate_col(pdata, col, true); | |
136 | ||
137 | for (row = 0; row < pdata->num_row_gpios; row++) | |
138 | new_state[col] |= | |
139 | row_asserted(pdata, row) ? (1 << row) : 0; | |
140 | ||
141 | activate_col(pdata, col, false); | |
142 | } | |
143 | ||
144 | for (col = 0; col < pdata->num_col_gpios; col++) { | |
145 | uint32_t bits_changed; | |
146 | ||
147 | bits_changed = keypad->last_key_state[col] ^ new_state[col]; | |
148 | if (bits_changed == 0) | |
149 | continue; | |
150 | ||
151 | for (row = 0; row < pdata->num_row_gpios; row++) { | |
152 | if ((bits_changed & (1 << row)) == 0) | |
153 | continue; | |
154 | ||
d82f1c35 | 155 | code = MATRIX_SCAN_CODE(row, col, keypad->row_shift); |
bab7614d EM |
156 | input_event(input_dev, EV_MSC, MSC_SCAN, code); |
157 | input_report_key(input_dev, | |
4a83eecf | 158 | keycodes[code], |
bab7614d EM |
159 | new_state[col] & (1 << row)); |
160 | } | |
161 | } | |
162 | input_sync(input_dev); | |
163 | ||
164 | memcpy(keypad->last_key_state, new_state, sizeof(new_state)); | |
165 | ||
166 | activate_all_cols(pdata, true); | |
167 | ||
168 | /* Enable IRQs again */ | |
169 | spin_lock_irq(&keypad->lock); | |
170 | keypad->scan_pending = false; | |
171 | enable_row_irqs(keypad); | |
172 | spin_unlock_irq(&keypad->lock); | |
173 | } | |
174 | ||
175 | static irqreturn_t matrix_keypad_interrupt(int irq, void *id) | |
176 | { | |
177 | struct matrix_keypad *keypad = id; | |
178 | unsigned long flags; | |
179 | ||
180 | spin_lock_irqsave(&keypad->lock, flags); | |
181 | ||
182 | /* | |
183 | * See if another IRQ beaten us to it and scheduled the | |
184 | * scan already. In that case we should not try to | |
185 | * disable IRQs again. | |
186 | */ | |
187 | if (unlikely(keypad->scan_pending || keypad->stopped)) | |
188 | goto out; | |
189 | ||
190 | disable_row_irqs(keypad); | |
191 | keypad->scan_pending = true; | |
192 | schedule_delayed_work(&keypad->work, | |
193 | msecs_to_jiffies(keypad->pdata->debounce_ms)); | |
194 | ||
195 | out: | |
196 | spin_unlock_irqrestore(&keypad->lock, flags); | |
197 | return IRQ_HANDLED; | |
198 | } | |
199 | ||
200 | static int matrix_keypad_start(struct input_dev *dev) | |
201 | { | |
202 | struct matrix_keypad *keypad = input_get_drvdata(dev); | |
203 | ||
204 | keypad->stopped = false; | |
205 | mb(); | |
206 | ||
207 | /* | |
208 | * Schedule an immediate key scan to capture current key state; | |
209 | * columns will be activated and IRQs be enabled after the scan. | |
210 | */ | |
211 | schedule_delayed_work(&keypad->work, 0); | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | static void matrix_keypad_stop(struct input_dev *dev) | |
217 | { | |
218 | struct matrix_keypad *keypad = input_get_drvdata(dev); | |
219 | ||
220 | keypad->stopped = true; | |
221 | mb(); | |
222 | flush_work(&keypad->work.work); | |
223 | /* | |
224 | * matrix_keypad_scan() will leave IRQs enabled; | |
225 | * we should disable them now. | |
226 | */ | |
227 | disable_row_irqs(keypad); | |
228 | } | |
229 | ||
0508c19a | 230 | #ifdef CONFIG_PM_SLEEP |
fb76dd10 | 231 | static void matrix_keypad_enable_wakeup(struct matrix_keypad *keypad) |
bab7614d | 232 | { |
bab7614d | 233 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; |
fb76dd10 | 234 | unsigned int gpio; |
bab7614d EM |
235 | int i; |
236 | ||
fb76dd10 LF |
237 | if (pdata->clustered_irq > 0) { |
238 | if (enable_irq_wake(pdata->clustered_irq) == 0) | |
239 | keypad->gpio_all_disabled = true; | |
240 | } else { | |
bab7614d | 241 | |
dd219234 DT |
242 | for (i = 0; i < pdata->num_row_gpios; i++) { |
243 | if (!test_bit(i, keypad->disabled_gpios)) { | |
fb76dd10 | 244 | gpio = pdata->row_gpios[i]; |
dd219234 DT |
245 | |
246 | if (enable_irq_wake(gpio_to_irq(gpio)) == 0) | |
247 | __set_bit(i, keypad->disabled_gpios); | |
248 | } | |
249 | } | |
250 | } | |
bab7614d EM |
251 | } |
252 | ||
fb76dd10 | 253 | static void matrix_keypad_disable_wakeup(struct matrix_keypad *keypad) |
bab7614d | 254 | { |
bab7614d | 255 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; |
fb76dd10 | 256 | unsigned int gpio; |
bab7614d EM |
257 | int i; |
258 | ||
fb76dd10 LF |
259 | if (pdata->clustered_irq > 0) { |
260 | if (keypad->gpio_all_disabled) { | |
261 | disable_irq_wake(pdata->clustered_irq); | |
262 | keypad->gpio_all_disabled = false; | |
263 | } | |
264 | } else { | |
dd219234 DT |
265 | for (i = 0; i < pdata->num_row_gpios; i++) { |
266 | if (test_and_clear_bit(i, keypad->disabled_gpios)) { | |
fb76dd10 | 267 | gpio = pdata->row_gpios[i]; |
dd219234 DT |
268 | disable_irq_wake(gpio_to_irq(gpio)); |
269 | } | |
270 | } | |
271 | } | |
fb76dd10 LF |
272 | } |
273 | ||
274 | static int matrix_keypad_suspend(struct device *dev) | |
275 | { | |
276 | struct platform_device *pdev = to_platform_device(dev); | |
277 | struct matrix_keypad *keypad = platform_get_drvdata(pdev); | |
278 | ||
279 | matrix_keypad_stop(keypad->input_dev); | |
280 | ||
281 | if (device_may_wakeup(&pdev->dev)) | |
282 | matrix_keypad_enable_wakeup(keypad); | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
287 | static int matrix_keypad_resume(struct device *dev) | |
288 | { | |
289 | struct platform_device *pdev = to_platform_device(dev); | |
290 | struct matrix_keypad *keypad = platform_get_drvdata(pdev); | |
291 | ||
292 | if (device_may_wakeup(&pdev->dev)) | |
293 | matrix_keypad_disable_wakeup(keypad); | |
bab7614d EM |
294 | |
295 | matrix_keypad_start(keypad->input_dev); | |
296 | ||
297 | return 0; | |
298 | } | |
bab7614d EM |
299 | #endif |
300 | ||
0508c19a DT |
301 | static SIMPLE_DEV_PM_OPS(matrix_keypad_pm_ops, |
302 | matrix_keypad_suspend, matrix_keypad_resume); | |
303 | ||
5298cc4c BP |
304 | static int matrix_keypad_init_gpio(struct platform_device *pdev, |
305 | struct matrix_keypad *keypad) | |
bab7614d EM |
306 | { |
307 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; | |
b83643eb | 308 | int i, err; |
bab7614d EM |
309 | |
310 | /* initialized strobe lines as outputs, activated */ | |
311 | for (i = 0; i < pdata->num_col_gpios; i++) { | |
312 | err = gpio_request(pdata->col_gpios[i], "matrix_kbd_col"); | |
313 | if (err) { | |
314 | dev_err(&pdev->dev, | |
315 | "failed to request GPIO%d for COL%d\n", | |
316 | pdata->col_gpios[i], i); | |
317 | goto err_free_cols; | |
318 | } | |
319 | ||
320 | gpio_direction_output(pdata->col_gpios[i], !pdata->active_low); | |
321 | } | |
322 | ||
323 | for (i = 0; i < pdata->num_row_gpios; i++) { | |
324 | err = gpio_request(pdata->row_gpios[i], "matrix_kbd_row"); | |
325 | if (err) { | |
326 | dev_err(&pdev->dev, | |
327 | "failed to request GPIO%d for ROW%d\n", | |
328 | pdata->row_gpios[i], i); | |
329 | goto err_free_rows; | |
330 | } | |
331 | ||
332 | gpio_direction_input(pdata->row_gpios[i]); | |
333 | } | |
334 | ||
fb76dd10 LF |
335 | if (pdata->clustered_irq > 0) { |
336 | err = request_irq(pdata->clustered_irq, | |
bab7614d | 337 | matrix_keypad_interrupt, |
fb76dd10 | 338 | pdata->clustered_irq_flags, |
bab7614d EM |
339 | "matrix-keypad", keypad); |
340 | if (err) { | |
341 | dev_err(&pdev->dev, | |
fb76dd10 LF |
342 | "Unable to acquire clustered interrupt\n"); |
343 | goto err_free_rows; | |
344 | } | |
345 | } else { | |
346 | for (i = 0; i < pdata->num_row_gpios; i++) { | |
347 | err = request_irq(gpio_to_irq(pdata->row_gpios[i]), | |
348 | matrix_keypad_interrupt, | |
fb76dd10 LF |
349 | IRQF_TRIGGER_RISING | |
350 | IRQF_TRIGGER_FALLING, | |
351 | "matrix-keypad", keypad); | |
352 | if (err) { | |
353 | dev_err(&pdev->dev, | |
b83643eb | 354 | "Unable to acquire interrupt for GPIO line %i\n", |
fb76dd10 LF |
355 | pdata->row_gpios[i]); |
356 | goto err_free_irqs; | |
357 | } | |
bab7614d EM |
358 | } |
359 | } | |
360 | ||
361 | /* initialized as disabled - enabled by input->open */ | |
362 | disable_row_irqs(keypad); | |
363 | return 0; | |
364 | ||
365 | err_free_irqs: | |
366 | while (--i >= 0) | |
367 | free_irq(gpio_to_irq(pdata->row_gpios[i]), keypad); | |
368 | i = pdata->num_row_gpios; | |
369 | err_free_rows: | |
370 | while (--i >= 0) | |
371 | gpio_free(pdata->row_gpios[i]); | |
372 | i = pdata->num_col_gpios; | |
373 | err_free_cols: | |
374 | while (--i >= 0) | |
375 | gpio_free(pdata->col_gpios[i]); | |
376 | ||
377 | return err; | |
378 | } | |
379 | ||
b83643eb DT |
380 | static void matrix_keypad_free_gpio(struct matrix_keypad *keypad) |
381 | { | |
382 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; | |
383 | int i; | |
384 | ||
385 | if (pdata->clustered_irq > 0) { | |
386 | free_irq(pdata->clustered_irq, keypad); | |
387 | } else { | |
388 | for (i = 0; i < pdata->num_row_gpios; i++) | |
389 | free_irq(gpio_to_irq(pdata->row_gpios[i]), keypad); | |
390 | } | |
391 | ||
392 | for (i = 0; i < pdata->num_row_gpios; i++) | |
393 | gpio_free(pdata->row_gpios[i]); | |
394 | ||
395 | for (i = 0; i < pdata->num_col_gpios; i++) | |
396 | gpio_free(pdata->col_gpios[i]); | |
397 | } | |
398 | ||
4a83eecf | 399 | #ifdef CONFIG_OF |
5298cc4c | 400 | static struct matrix_keypad_platform_data * |
4a83eecf AC |
401 | matrix_keypad_parse_dt(struct device *dev) |
402 | { | |
403 | struct matrix_keypad_platform_data *pdata; | |
404 | struct device_node *np = dev->of_node; | |
405 | unsigned int *gpios; | |
e80beb27 | 406 | int i, nrow, ncol; |
4a83eecf AC |
407 | |
408 | if (!np) { | |
409 | dev_err(dev, "device lacks DT data\n"); | |
410 | return ERR_PTR(-ENODEV); | |
411 | } | |
412 | ||
413 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
414 | if (!pdata) { | |
415 | dev_err(dev, "could not allocate memory for platform data\n"); | |
416 | return ERR_PTR(-ENOMEM); | |
417 | } | |
418 | ||
e80beb27 GL |
419 | pdata->num_row_gpios = nrow = of_gpio_named_count(np, "row-gpios"); |
420 | pdata->num_col_gpios = ncol = of_gpio_named_count(np, "col-gpios"); | |
421 | if (nrow <= 0 || ncol <= 0) { | |
4a83eecf AC |
422 | dev_err(dev, "number of keypad rows/columns not specified\n"); |
423 | return ERR_PTR(-EINVAL); | |
424 | } | |
425 | ||
426 | if (of_get_property(np, "linux,no-autorepeat", NULL)) | |
427 | pdata->no_autorepeat = true; | |
428 | if (of_get_property(np, "linux,wakeup", NULL)) | |
429 | pdata->wakeup = true; | |
430 | if (of_get_property(np, "gpio-activelow", NULL)) | |
431 | pdata->active_low = true; | |
432 | ||
433 | of_property_read_u32(np, "debounce-delay-ms", &pdata->debounce_ms); | |
434 | of_property_read_u32(np, "col-scan-delay-us", | |
435 | &pdata->col_scan_delay_us); | |
436 | ||
437 | gpios = devm_kzalloc(dev, | |
438 | sizeof(unsigned int) * | |
439 | (pdata->num_row_gpios + pdata->num_col_gpios), | |
440 | GFP_KERNEL); | |
441 | if (!gpios) { | |
442 | dev_err(dev, "could not allocate memory for gpios\n"); | |
443 | return ERR_PTR(-ENOMEM); | |
444 | } | |
445 | ||
446 | for (i = 0; i < pdata->num_row_gpios; i++) | |
447 | gpios[i] = of_get_named_gpio(np, "row-gpios", i); | |
448 | ||
449 | for (i = 0; i < pdata->num_col_gpios; i++) | |
450 | gpios[pdata->num_row_gpios + i] = | |
451 | of_get_named_gpio(np, "col-gpios", i); | |
452 | ||
453 | pdata->row_gpios = gpios; | |
454 | pdata->col_gpios = &gpios[pdata->num_row_gpios]; | |
455 | ||
456 | return pdata; | |
457 | } | |
458 | #else | |
459 | static inline struct matrix_keypad_platform_data * | |
460 | matrix_keypad_parse_dt(struct device *dev) | |
461 | { | |
462 | dev_err(dev, "no platform data defined\n"); | |
463 | ||
464 | return ERR_PTR(-EINVAL); | |
465 | } | |
466 | #endif | |
467 | ||
5298cc4c | 468 | static int matrix_keypad_probe(struct platform_device *pdev) |
bab7614d EM |
469 | { |
470 | const struct matrix_keypad_platform_data *pdata; | |
bab7614d EM |
471 | struct matrix_keypad *keypad; |
472 | struct input_dev *input_dev; | |
bab7614d EM |
473 | int err; |
474 | ||
4a83eecf | 475 | pdata = dev_get_platdata(&pdev->dev); |
bab7614d | 476 | if (!pdata) { |
4a83eecf AC |
477 | pdata = matrix_keypad_parse_dt(&pdev->dev); |
478 | if (IS_ERR(pdata)) { | |
479 | dev_err(&pdev->dev, "no platform data defined\n"); | |
480 | return PTR_ERR(pdata); | |
481 | } | |
482 | } else if (!pdata->keymap_data) { | |
bab7614d EM |
483 | dev_err(&pdev->dev, "no keymap data defined\n"); |
484 | return -EINVAL; | |
485 | } | |
486 | ||
4a83eecf | 487 | keypad = kzalloc(sizeof(struct matrix_keypad), GFP_KERNEL); |
bab7614d | 488 | input_dev = input_allocate_device(); |
01111fcd | 489 | if (!keypad || !input_dev) { |
bab7614d EM |
490 | err = -ENOMEM; |
491 | goto err_free_mem; | |
492 | } | |
493 | ||
494 | keypad->input_dev = input_dev; | |
495 | keypad->pdata = pdata; | |
4a83eecf | 496 | keypad->row_shift = get_count_order(pdata->num_col_gpios); |
bab7614d EM |
497 | keypad->stopped = true; |
498 | INIT_DELAYED_WORK(&keypad->work, matrix_keypad_scan); | |
499 | spin_lock_init(&keypad->lock); | |
500 | ||
501 | input_dev->name = pdev->name; | |
502 | input_dev->id.bustype = BUS_HOST; | |
503 | input_dev->dev.parent = &pdev->dev; | |
bab7614d EM |
504 | input_dev->open = matrix_keypad_start; |
505 | input_dev->close = matrix_keypad_stop; | |
506 | ||
4a83eecf | 507 | err = matrix_keypad_build_keymap(pdata->keymap_data, NULL, |
1932811f DT |
508 | pdata->num_row_gpios, |
509 | pdata->num_col_gpios, | |
4a83eecf AC |
510 | NULL, input_dev); |
511 | if (err) { | |
512 | dev_err(&pdev->dev, "failed to build keymap\n"); | |
1932811f | 513 | goto err_free_mem; |
4a83eecf | 514 | } |
bab7614d | 515 | |
1932811f DT |
516 | if (!pdata->no_autorepeat) |
517 | __set_bit(EV_REP, input_dev->evbit); | |
bab7614d EM |
518 | input_set_capability(input_dev, EV_MSC, MSC_SCAN); |
519 | input_set_drvdata(input_dev, keypad); | |
520 | ||
b83643eb | 521 | err = matrix_keypad_init_gpio(pdev, keypad); |
bab7614d EM |
522 | if (err) |
523 | goto err_free_mem; | |
524 | ||
525 | err = input_register_device(keypad->input_dev); | |
526 | if (err) | |
b83643eb | 527 | goto err_free_gpio; |
bab7614d EM |
528 | |
529 | device_init_wakeup(&pdev->dev, pdata->wakeup); | |
530 | platform_set_drvdata(pdev, keypad); | |
531 | ||
532 | return 0; | |
533 | ||
b83643eb DT |
534 | err_free_gpio: |
535 | matrix_keypad_free_gpio(keypad); | |
bab7614d EM |
536 | err_free_mem: |
537 | input_free_device(input_dev); | |
bab7614d EM |
538 | kfree(keypad); |
539 | return err; | |
540 | } | |
541 | ||
e2619cf7 | 542 | static int matrix_keypad_remove(struct platform_device *pdev) |
bab7614d EM |
543 | { |
544 | struct matrix_keypad *keypad = platform_get_drvdata(pdev); | |
bab7614d EM |
545 | |
546 | device_init_wakeup(&pdev->dev, 0); | |
547 | ||
b83643eb | 548 | matrix_keypad_free_gpio(keypad); |
bab7614d | 549 | input_unregister_device(keypad->input_dev); |
bab7614d EM |
550 | kfree(keypad); |
551 | ||
b83643eb DT |
552 | platform_set_drvdata(pdev, NULL); |
553 | ||
bab7614d EM |
554 | return 0; |
555 | } | |
556 | ||
4a83eecf AC |
557 | #ifdef CONFIG_OF |
558 | static const struct of_device_id matrix_keypad_dt_match[] = { | |
559 | { .compatible = "gpio-matrix-keypad" }, | |
560 | { } | |
561 | }; | |
562 | MODULE_DEVICE_TABLE(of, matrix_keypad_dt_match); | |
563 | #endif | |
564 | ||
bab7614d EM |
565 | static struct platform_driver matrix_keypad_driver = { |
566 | .probe = matrix_keypad_probe, | |
1cb0aa88 | 567 | .remove = matrix_keypad_remove, |
bab7614d EM |
568 | .driver = { |
569 | .name = "matrix-keypad", | |
570 | .owner = THIS_MODULE, | |
f72a28ab | 571 | .pm = &matrix_keypad_pm_ops, |
4a83eecf | 572 | .of_match_table = of_match_ptr(matrix_keypad_dt_match), |
bab7614d EM |
573 | }, |
574 | }; | |
5146c84f | 575 | module_platform_driver(matrix_keypad_driver); |
bab7614d EM |
576 | |
577 | MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); | |
578 | MODULE_DESCRIPTION("GPIO Driven Matrix Keypad Driver"); | |
579 | MODULE_LICENSE("GPL v2"); | |
580 | MODULE_ALIAS("platform:matrix-keypad"); |