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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> | |
bab7614d EM |
17 | #include <linux/input.h> |
18 | #include <linux/irq.h> | |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/jiffies.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/gpio.h> | |
23 | #include <linux/input/matrix_keypad.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
4a83eecf AC |
25 | #include <linux/of.h> |
26 | #include <linux/of_gpio.h> | |
27 | #include <linux/of_platform.h> | |
bab7614d EM |
28 | |
29 | struct matrix_keypad { | |
30 | const struct matrix_keypad_platform_data *pdata; | |
31 | struct input_dev *input_dev; | |
d82f1c35 | 32 | unsigned int row_shift; |
bab7614d | 33 | |
dd219234 DT |
34 | DECLARE_BITMAP(disabled_gpios, MATRIX_MAX_ROWS); |
35 | ||
bab7614d EM |
36 | uint32_t last_key_state[MATRIX_MAX_COLS]; |
37 | struct delayed_work work; | |
dd219234 | 38 | spinlock_t lock; |
bab7614d EM |
39 | bool scan_pending; |
40 | bool stopped; | |
fb76dd10 | 41 | bool gpio_all_disabled; |
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; | |
4a83eecf | 121 | const unsigned short *keycodes = input_dev->keycode; |
bab7614d EM |
122 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; |
123 | uint32_t new_state[MATRIX_MAX_COLS]; | |
124 | int row, col, code; | |
125 | ||
126 | /* de-activate all columns for scanning */ | |
127 | activate_all_cols(pdata, false); | |
128 | ||
129 | memset(new_state, 0, sizeof(new_state)); | |
130 | ||
131 | /* assert each column and read the row status out */ | |
132 | for (col = 0; col < pdata->num_col_gpios; col++) { | |
133 | ||
134 | activate_col(pdata, col, true); | |
135 | ||
136 | for (row = 0; row < pdata->num_row_gpios; row++) | |
137 | new_state[col] |= | |
138 | row_asserted(pdata, row) ? (1 << row) : 0; | |
139 | ||
140 | activate_col(pdata, col, false); | |
141 | } | |
142 | ||
143 | for (col = 0; col < pdata->num_col_gpios; col++) { | |
144 | uint32_t bits_changed; | |
145 | ||
146 | bits_changed = keypad->last_key_state[col] ^ new_state[col]; | |
147 | if (bits_changed == 0) | |
148 | continue; | |
149 | ||
150 | for (row = 0; row < pdata->num_row_gpios; row++) { | |
151 | if ((bits_changed & (1 << row)) == 0) | |
152 | continue; | |
153 | ||
d82f1c35 | 154 | code = MATRIX_SCAN_CODE(row, col, keypad->row_shift); |
bab7614d EM |
155 | input_event(input_dev, EV_MSC, MSC_SCAN, code); |
156 | input_report_key(input_dev, | |
4a83eecf | 157 | keycodes[code], |
bab7614d EM |
158 | new_state[col] & (1 << row)); |
159 | } | |
160 | } | |
161 | input_sync(input_dev); | |
162 | ||
163 | memcpy(keypad->last_key_state, new_state, sizeof(new_state)); | |
164 | ||
165 | activate_all_cols(pdata, true); | |
166 | ||
167 | /* Enable IRQs again */ | |
168 | spin_lock_irq(&keypad->lock); | |
169 | keypad->scan_pending = false; | |
170 | enable_row_irqs(keypad); | |
171 | spin_unlock_irq(&keypad->lock); | |
172 | } | |
173 | ||
174 | static irqreturn_t matrix_keypad_interrupt(int irq, void *id) | |
175 | { | |
176 | struct matrix_keypad *keypad = id; | |
177 | unsigned long flags; | |
178 | ||
179 | spin_lock_irqsave(&keypad->lock, flags); | |
180 | ||
181 | /* | |
182 | * See if another IRQ beaten us to it and scheduled the | |
183 | * scan already. In that case we should not try to | |
184 | * disable IRQs again. | |
185 | */ | |
186 | if (unlikely(keypad->scan_pending || keypad->stopped)) | |
187 | goto out; | |
188 | ||
189 | disable_row_irqs(keypad); | |
190 | keypad->scan_pending = true; | |
191 | schedule_delayed_work(&keypad->work, | |
192 | msecs_to_jiffies(keypad->pdata->debounce_ms)); | |
193 | ||
194 | out: | |
195 | spin_unlock_irqrestore(&keypad->lock, flags); | |
196 | return IRQ_HANDLED; | |
197 | } | |
198 | ||
199 | static int matrix_keypad_start(struct input_dev *dev) | |
200 | { | |
201 | struct matrix_keypad *keypad = input_get_drvdata(dev); | |
202 | ||
203 | keypad->stopped = false; | |
204 | mb(); | |
205 | ||
206 | /* | |
207 | * Schedule an immediate key scan to capture current key state; | |
208 | * columns will be activated and IRQs be enabled after the scan. | |
209 | */ | |
210 | schedule_delayed_work(&keypad->work, 0); | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
215 | static void matrix_keypad_stop(struct input_dev *dev) | |
216 | { | |
217 | struct matrix_keypad *keypad = input_get_drvdata(dev); | |
218 | ||
219 | keypad->stopped = true; | |
220 | mb(); | |
221 | flush_work(&keypad->work.work); | |
222 | /* | |
223 | * matrix_keypad_scan() will leave IRQs enabled; | |
224 | * we should disable them now. | |
225 | */ | |
226 | disable_row_irqs(keypad); | |
227 | } | |
228 | ||
0508c19a | 229 | #ifdef CONFIG_PM_SLEEP |
fb76dd10 | 230 | static void matrix_keypad_enable_wakeup(struct matrix_keypad *keypad) |
bab7614d | 231 | { |
bab7614d | 232 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; |
fb76dd10 | 233 | unsigned int gpio; |
bab7614d EM |
234 | int i; |
235 | ||
fb76dd10 LF |
236 | if (pdata->clustered_irq > 0) { |
237 | if (enable_irq_wake(pdata->clustered_irq) == 0) | |
238 | keypad->gpio_all_disabled = true; | |
239 | } else { | |
bab7614d | 240 | |
dd219234 DT |
241 | for (i = 0; i < pdata->num_row_gpios; i++) { |
242 | if (!test_bit(i, keypad->disabled_gpios)) { | |
fb76dd10 | 243 | gpio = pdata->row_gpios[i]; |
dd219234 DT |
244 | |
245 | if (enable_irq_wake(gpio_to_irq(gpio)) == 0) | |
246 | __set_bit(i, keypad->disabled_gpios); | |
247 | } | |
248 | } | |
249 | } | |
bab7614d EM |
250 | } |
251 | ||
fb76dd10 | 252 | static void matrix_keypad_disable_wakeup(struct matrix_keypad *keypad) |
bab7614d | 253 | { |
bab7614d | 254 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; |
fb76dd10 | 255 | unsigned int gpio; |
bab7614d EM |
256 | int i; |
257 | ||
fb76dd10 LF |
258 | if (pdata->clustered_irq > 0) { |
259 | if (keypad->gpio_all_disabled) { | |
260 | disable_irq_wake(pdata->clustered_irq); | |
261 | keypad->gpio_all_disabled = false; | |
262 | } | |
263 | } else { | |
dd219234 DT |
264 | for (i = 0; i < pdata->num_row_gpios; i++) { |
265 | if (test_and_clear_bit(i, keypad->disabled_gpios)) { | |
fb76dd10 | 266 | gpio = pdata->row_gpios[i]; |
dd219234 DT |
267 | disable_irq_wake(gpio_to_irq(gpio)); |
268 | } | |
269 | } | |
270 | } | |
fb76dd10 LF |
271 | } |
272 | ||
273 | static int matrix_keypad_suspend(struct device *dev) | |
274 | { | |
275 | struct platform_device *pdev = to_platform_device(dev); | |
276 | struct matrix_keypad *keypad = platform_get_drvdata(pdev); | |
277 | ||
278 | matrix_keypad_stop(keypad->input_dev); | |
279 | ||
280 | if (device_may_wakeup(&pdev->dev)) | |
281 | matrix_keypad_enable_wakeup(keypad); | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
286 | static int matrix_keypad_resume(struct device *dev) | |
287 | { | |
288 | struct platform_device *pdev = to_platform_device(dev); | |
289 | struct matrix_keypad *keypad = platform_get_drvdata(pdev); | |
290 | ||
291 | if (device_may_wakeup(&pdev->dev)) | |
292 | matrix_keypad_disable_wakeup(keypad); | |
bab7614d EM |
293 | |
294 | matrix_keypad_start(keypad->input_dev); | |
295 | ||
296 | return 0; | |
297 | } | |
bab7614d EM |
298 | #endif |
299 | ||
0508c19a DT |
300 | static SIMPLE_DEV_PM_OPS(matrix_keypad_pm_ops, |
301 | matrix_keypad_suspend, matrix_keypad_resume); | |
302 | ||
5298cc4c BP |
303 | static int matrix_keypad_init_gpio(struct platform_device *pdev, |
304 | struct matrix_keypad *keypad) | |
bab7614d EM |
305 | { |
306 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; | |
b83643eb | 307 | int i, err; |
bab7614d EM |
308 | |
309 | /* initialized strobe lines as outputs, activated */ | |
310 | for (i = 0; i < pdata->num_col_gpios; i++) { | |
311 | err = gpio_request(pdata->col_gpios[i], "matrix_kbd_col"); | |
312 | if (err) { | |
313 | dev_err(&pdev->dev, | |
314 | "failed to request GPIO%d for COL%d\n", | |
315 | pdata->col_gpios[i], i); | |
316 | goto err_free_cols; | |
317 | } | |
318 | ||
319 | gpio_direction_output(pdata->col_gpios[i], !pdata->active_low); | |
320 | } | |
321 | ||
322 | for (i = 0; i < pdata->num_row_gpios; i++) { | |
323 | err = gpio_request(pdata->row_gpios[i], "matrix_kbd_row"); | |
324 | if (err) { | |
325 | dev_err(&pdev->dev, | |
326 | "failed to request GPIO%d for ROW%d\n", | |
327 | pdata->row_gpios[i], i); | |
328 | goto err_free_rows; | |
329 | } | |
330 | ||
331 | gpio_direction_input(pdata->row_gpios[i]); | |
332 | } | |
333 | ||
fb76dd10 | 334 | if (pdata->clustered_irq > 0) { |
24e4d21c | 335 | err = request_any_context_irq(pdata->clustered_irq, |
bab7614d | 336 | matrix_keypad_interrupt, |
fb76dd10 | 337 | pdata->clustered_irq_flags, |
bab7614d | 338 | "matrix-keypad", keypad); |
24e4d21c | 339 | if (err < 0) { |
bab7614d | 340 | dev_err(&pdev->dev, |
fb76dd10 LF |
341 | "Unable to acquire clustered interrupt\n"); |
342 | goto err_free_rows; | |
343 | } | |
344 | } else { | |
345 | for (i = 0; i < pdata->num_row_gpios; i++) { | |
24e4d21c LW |
346 | err = request_any_context_irq( |
347 | gpio_to_irq(pdata->row_gpios[i]), | |
fb76dd10 | 348 | matrix_keypad_interrupt, |
fb76dd10 LF |
349 | IRQF_TRIGGER_RISING | |
350 | IRQF_TRIGGER_FALLING, | |
351 | "matrix-keypad", keypad); | |
24e4d21c | 352 | if (err < 0) { |
fb76dd10 | 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; | |
aeda5003 DT |
428 | |
429 | pdata->wakeup = of_property_read_bool(np, "wakeup-source") || | |
430 | of_property_read_bool(np, "linux,wakeup"); /* legacy */ | |
431 | ||
4a83eecf AC |
432 | if (of_get_property(np, "gpio-activelow", NULL)) |
433 | pdata->active_low = true; | |
434 | ||
435 | of_property_read_u32(np, "debounce-delay-ms", &pdata->debounce_ms); | |
436 | of_property_read_u32(np, "col-scan-delay-us", | |
437 | &pdata->col_scan_delay_us); | |
438 | ||
439 | gpios = devm_kzalloc(dev, | |
440 | sizeof(unsigned int) * | |
441 | (pdata->num_row_gpios + pdata->num_col_gpios), | |
442 | GFP_KERNEL); | |
443 | if (!gpios) { | |
444 | dev_err(dev, "could not allocate memory for gpios\n"); | |
445 | return ERR_PTR(-ENOMEM); | |
446 | } | |
447 | ||
448 | for (i = 0; i < pdata->num_row_gpios; i++) | |
449 | gpios[i] = of_get_named_gpio(np, "row-gpios", i); | |
450 | ||
451 | for (i = 0; i < pdata->num_col_gpios; i++) | |
452 | gpios[pdata->num_row_gpios + i] = | |
453 | of_get_named_gpio(np, "col-gpios", i); | |
454 | ||
455 | pdata->row_gpios = gpios; | |
456 | pdata->col_gpios = &gpios[pdata->num_row_gpios]; | |
457 | ||
458 | return pdata; | |
459 | } | |
460 | #else | |
461 | static inline struct matrix_keypad_platform_data * | |
462 | matrix_keypad_parse_dt(struct device *dev) | |
463 | { | |
464 | dev_err(dev, "no platform data defined\n"); | |
465 | ||
466 | return ERR_PTR(-EINVAL); | |
467 | } | |
468 | #endif | |
469 | ||
5298cc4c | 470 | static int matrix_keypad_probe(struct platform_device *pdev) |
bab7614d EM |
471 | { |
472 | const struct matrix_keypad_platform_data *pdata; | |
bab7614d EM |
473 | struct matrix_keypad *keypad; |
474 | struct input_dev *input_dev; | |
bab7614d EM |
475 | int err; |
476 | ||
4a83eecf | 477 | pdata = dev_get_platdata(&pdev->dev); |
bab7614d | 478 | if (!pdata) { |
4a83eecf AC |
479 | pdata = matrix_keypad_parse_dt(&pdev->dev); |
480 | if (IS_ERR(pdata)) { | |
481 | dev_err(&pdev->dev, "no platform data defined\n"); | |
482 | return PTR_ERR(pdata); | |
483 | } | |
484 | } else if (!pdata->keymap_data) { | |
bab7614d EM |
485 | dev_err(&pdev->dev, "no keymap data defined\n"); |
486 | return -EINVAL; | |
487 | } | |
488 | ||
4a83eecf | 489 | keypad = kzalloc(sizeof(struct matrix_keypad), GFP_KERNEL); |
bab7614d | 490 | input_dev = input_allocate_device(); |
01111fcd | 491 | if (!keypad || !input_dev) { |
bab7614d EM |
492 | err = -ENOMEM; |
493 | goto err_free_mem; | |
494 | } | |
495 | ||
496 | keypad->input_dev = input_dev; | |
497 | keypad->pdata = pdata; | |
4a83eecf | 498 | keypad->row_shift = get_count_order(pdata->num_col_gpios); |
bab7614d EM |
499 | keypad->stopped = true; |
500 | INIT_DELAYED_WORK(&keypad->work, matrix_keypad_scan); | |
501 | spin_lock_init(&keypad->lock); | |
502 | ||
503 | input_dev->name = pdev->name; | |
504 | input_dev->id.bustype = BUS_HOST; | |
505 | input_dev->dev.parent = &pdev->dev; | |
bab7614d EM |
506 | input_dev->open = matrix_keypad_start; |
507 | input_dev->close = matrix_keypad_stop; | |
508 | ||
4a83eecf | 509 | err = matrix_keypad_build_keymap(pdata->keymap_data, NULL, |
1932811f DT |
510 | pdata->num_row_gpios, |
511 | pdata->num_col_gpios, | |
4a83eecf AC |
512 | NULL, input_dev); |
513 | if (err) { | |
514 | dev_err(&pdev->dev, "failed to build keymap\n"); | |
1932811f | 515 | goto err_free_mem; |
4a83eecf | 516 | } |
bab7614d | 517 | |
1932811f DT |
518 | if (!pdata->no_autorepeat) |
519 | __set_bit(EV_REP, input_dev->evbit); | |
bab7614d EM |
520 | input_set_capability(input_dev, EV_MSC, MSC_SCAN); |
521 | input_set_drvdata(input_dev, keypad); | |
522 | ||
b83643eb | 523 | err = matrix_keypad_init_gpio(pdev, keypad); |
bab7614d EM |
524 | if (err) |
525 | goto err_free_mem; | |
526 | ||
527 | err = input_register_device(keypad->input_dev); | |
528 | if (err) | |
b83643eb | 529 | goto err_free_gpio; |
bab7614d EM |
530 | |
531 | device_init_wakeup(&pdev->dev, pdata->wakeup); | |
532 | platform_set_drvdata(pdev, keypad); | |
533 | ||
534 | return 0; | |
535 | ||
b83643eb DT |
536 | err_free_gpio: |
537 | matrix_keypad_free_gpio(keypad); | |
bab7614d EM |
538 | err_free_mem: |
539 | input_free_device(input_dev); | |
bab7614d EM |
540 | kfree(keypad); |
541 | return err; | |
542 | } | |
543 | ||
e2619cf7 | 544 | static int matrix_keypad_remove(struct platform_device *pdev) |
bab7614d EM |
545 | { |
546 | struct matrix_keypad *keypad = platform_get_drvdata(pdev); | |
bab7614d EM |
547 | |
548 | device_init_wakeup(&pdev->dev, 0); | |
549 | ||
b83643eb | 550 | matrix_keypad_free_gpio(keypad); |
bab7614d | 551 | input_unregister_device(keypad->input_dev); |
bab7614d EM |
552 | kfree(keypad); |
553 | ||
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", | |
f72a28ab | 570 | .pm = &matrix_keypad_pm_ops, |
4a83eecf | 571 | .of_match_table = of_match_ptr(matrix_keypad_dt_match), |
bab7614d EM |
572 | }, |
573 | }; | |
5146c84f | 574 | module_platform_driver(matrix_keypad_driver); |
bab7614d EM |
575 | |
576 | MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); | |
577 | MODULE_DESCRIPTION("GPIO Driven Matrix Keypad Driver"); | |
578 | MODULE_LICENSE("GPL v2"); | |
579 | MODULE_ALIAS("platform:matrix-keypad"); |