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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 | /* | |
aa0e26bb DR |
45 | * NOTE: If drive_inactive_cols is false, then the GPIO has to be put into |
46 | * HiZ when de-activated to cause minmal side effect when scanning other | |
47 | * columns. In that case it is configured here to be input, otherwise it is | |
48 | * driven with the inactive value. | |
bab7614d EM |
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); | |
aa0e26bb DR |
59 | if (!pdata->drive_inactive_cols) |
60 | gpio_direction_input(pdata->col_gpios[col]); | |
bab7614d EM |
61 | } |
62 | } | |
63 | ||
64 | static void activate_col(const struct matrix_keypad_platform_data *pdata, | |
65 | int col, bool on) | |
66 | { | |
67 | __activate_col(pdata, col, on); | |
68 | ||
69 | if (on && pdata->col_scan_delay_us) | |
70 | udelay(pdata->col_scan_delay_us); | |
71 | } | |
72 | ||
73 | static void activate_all_cols(const struct matrix_keypad_platform_data *pdata, | |
74 | bool on) | |
75 | { | |
76 | int col; | |
77 | ||
78 | for (col = 0; col < pdata->num_col_gpios; col++) | |
79 | __activate_col(pdata, col, on); | |
80 | } | |
81 | ||
82 | static bool row_asserted(const struct matrix_keypad_platform_data *pdata, | |
83 | int row) | |
84 | { | |
85 | return gpio_get_value_cansleep(pdata->row_gpios[row]) ? | |
86 | !pdata->active_low : pdata->active_low; | |
87 | } | |
88 | ||
89 | static void enable_row_irqs(struct matrix_keypad *keypad) | |
90 | { | |
91 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; | |
92 | int i; | |
93 | ||
fb76dd10 LF |
94 | if (pdata->clustered_irq > 0) |
95 | enable_irq(pdata->clustered_irq); | |
96 | else { | |
97 | for (i = 0; i < pdata->num_row_gpios; i++) | |
98 | enable_irq(gpio_to_irq(pdata->row_gpios[i])); | |
99 | } | |
bab7614d EM |
100 | } |
101 | ||
102 | static void disable_row_irqs(struct matrix_keypad *keypad) | |
103 | { | |
104 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; | |
105 | int i; | |
106 | ||
fb76dd10 LF |
107 | if (pdata->clustered_irq > 0) |
108 | disable_irq_nosync(pdata->clustered_irq); | |
109 | else { | |
110 | for (i = 0; i < pdata->num_row_gpios; i++) | |
111 | disable_irq_nosync(gpio_to_irq(pdata->row_gpios[i])); | |
112 | } | |
bab7614d EM |
113 | } |
114 | ||
115 | /* | |
116 | * This gets the keys from keyboard and reports it to input subsystem | |
117 | */ | |
118 | static void matrix_keypad_scan(struct work_struct *work) | |
119 | { | |
120 | struct matrix_keypad *keypad = | |
121 | container_of(work, struct matrix_keypad, work.work); | |
122 | struct input_dev *input_dev = keypad->input_dev; | |
4a83eecf | 123 | const unsigned short *keycodes = input_dev->keycode; |
bab7614d EM |
124 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; |
125 | uint32_t new_state[MATRIX_MAX_COLS]; | |
126 | int row, col, code; | |
127 | ||
128 | /* de-activate all columns for scanning */ | |
129 | activate_all_cols(pdata, false); | |
130 | ||
131 | memset(new_state, 0, sizeof(new_state)); | |
132 | ||
133 | /* assert each column and read the row status out */ | |
134 | for (col = 0; col < pdata->num_col_gpios; col++) { | |
135 | ||
136 | activate_col(pdata, col, true); | |
137 | ||
138 | for (row = 0; row < pdata->num_row_gpios; row++) | |
139 | new_state[col] |= | |
140 | row_asserted(pdata, row) ? (1 << row) : 0; | |
141 | ||
142 | activate_col(pdata, col, false); | |
143 | } | |
144 | ||
145 | for (col = 0; col < pdata->num_col_gpios; col++) { | |
146 | uint32_t bits_changed; | |
147 | ||
148 | bits_changed = keypad->last_key_state[col] ^ new_state[col]; | |
149 | if (bits_changed == 0) | |
150 | continue; | |
151 | ||
152 | for (row = 0; row < pdata->num_row_gpios; row++) { | |
153 | if ((bits_changed & (1 << row)) == 0) | |
154 | continue; | |
155 | ||
d82f1c35 | 156 | code = MATRIX_SCAN_CODE(row, col, keypad->row_shift); |
bab7614d EM |
157 | input_event(input_dev, EV_MSC, MSC_SCAN, code); |
158 | input_report_key(input_dev, | |
4a83eecf | 159 | keycodes[code], |
bab7614d EM |
160 | new_state[col] & (1 << row)); |
161 | } | |
162 | } | |
163 | input_sync(input_dev); | |
164 | ||
165 | memcpy(keypad->last_key_state, new_state, sizeof(new_state)); | |
166 | ||
167 | activate_all_cols(pdata, true); | |
168 | ||
169 | /* Enable IRQs again */ | |
170 | spin_lock_irq(&keypad->lock); | |
171 | keypad->scan_pending = false; | |
172 | enable_row_irqs(keypad); | |
173 | spin_unlock_irq(&keypad->lock); | |
174 | } | |
175 | ||
176 | static irqreturn_t matrix_keypad_interrupt(int irq, void *id) | |
177 | { | |
178 | struct matrix_keypad *keypad = id; | |
179 | unsigned long flags; | |
180 | ||
181 | spin_lock_irqsave(&keypad->lock, flags); | |
182 | ||
183 | /* | |
184 | * See if another IRQ beaten us to it and scheduled the | |
185 | * scan already. In that case we should not try to | |
186 | * disable IRQs again. | |
187 | */ | |
188 | if (unlikely(keypad->scan_pending || keypad->stopped)) | |
189 | goto out; | |
190 | ||
191 | disable_row_irqs(keypad); | |
192 | keypad->scan_pending = true; | |
193 | schedule_delayed_work(&keypad->work, | |
194 | msecs_to_jiffies(keypad->pdata->debounce_ms)); | |
195 | ||
196 | out: | |
197 | spin_unlock_irqrestore(&keypad->lock, flags); | |
198 | return IRQ_HANDLED; | |
199 | } | |
200 | ||
201 | static int matrix_keypad_start(struct input_dev *dev) | |
202 | { | |
203 | struct matrix_keypad *keypad = input_get_drvdata(dev); | |
204 | ||
205 | keypad->stopped = false; | |
206 | mb(); | |
207 | ||
208 | /* | |
209 | * Schedule an immediate key scan to capture current key state; | |
210 | * columns will be activated and IRQs be enabled after the scan. | |
211 | */ | |
212 | schedule_delayed_work(&keypad->work, 0); | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | static void matrix_keypad_stop(struct input_dev *dev) | |
218 | { | |
219 | struct matrix_keypad *keypad = input_get_drvdata(dev); | |
220 | ||
221 | keypad->stopped = true; | |
222 | mb(); | |
223 | flush_work(&keypad->work.work); | |
224 | /* | |
225 | * matrix_keypad_scan() will leave IRQs enabled; | |
226 | * we should disable them now. | |
227 | */ | |
228 | disable_row_irqs(keypad); | |
229 | } | |
230 | ||
0508c19a | 231 | #ifdef CONFIG_PM_SLEEP |
fb76dd10 | 232 | static void matrix_keypad_enable_wakeup(struct matrix_keypad *keypad) |
bab7614d | 233 | { |
bab7614d | 234 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; |
fb76dd10 | 235 | unsigned int gpio; |
bab7614d EM |
236 | int i; |
237 | ||
fb76dd10 LF |
238 | if (pdata->clustered_irq > 0) { |
239 | if (enable_irq_wake(pdata->clustered_irq) == 0) | |
240 | keypad->gpio_all_disabled = true; | |
241 | } else { | |
bab7614d | 242 | |
dd219234 DT |
243 | for (i = 0; i < pdata->num_row_gpios; i++) { |
244 | if (!test_bit(i, keypad->disabled_gpios)) { | |
fb76dd10 | 245 | gpio = pdata->row_gpios[i]; |
dd219234 DT |
246 | |
247 | if (enable_irq_wake(gpio_to_irq(gpio)) == 0) | |
248 | __set_bit(i, keypad->disabled_gpios); | |
249 | } | |
250 | } | |
251 | } | |
bab7614d EM |
252 | } |
253 | ||
fb76dd10 | 254 | static void matrix_keypad_disable_wakeup(struct matrix_keypad *keypad) |
bab7614d | 255 | { |
bab7614d | 256 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; |
fb76dd10 | 257 | unsigned int gpio; |
bab7614d EM |
258 | int i; |
259 | ||
fb76dd10 LF |
260 | if (pdata->clustered_irq > 0) { |
261 | if (keypad->gpio_all_disabled) { | |
262 | disable_irq_wake(pdata->clustered_irq); | |
263 | keypad->gpio_all_disabled = false; | |
264 | } | |
265 | } else { | |
dd219234 DT |
266 | for (i = 0; i < pdata->num_row_gpios; i++) { |
267 | if (test_and_clear_bit(i, keypad->disabled_gpios)) { | |
fb76dd10 | 268 | gpio = pdata->row_gpios[i]; |
dd219234 DT |
269 | disable_irq_wake(gpio_to_irq(gpio)); |
270 | } | |
271 | } | |
272 | } | |
fb76dd10 LF |
273 | } |
274 | ||
275 | static int matrix_keypad_suspend(struct device *dev) | |
276 | { | |
277 | struct platform_device *pdev = to_platform_device(dev); | |
278 | struct matrix_keypad *keypad = platform_get_drvdata(pdev); | |
279 | ||
280 | matrix_keypad_stop(keypad->input_dev); | |
281 | ||
282 | if (device_may_wakeup(&pdev->dev)) | |
283 | matrix_keypad_enable_wakeup(keypad); | |
284 | ||
285 | return 0; | |
286 | } | |
287 | ||
288 | static int matrix_keypad_resume(struct device *dev) | |
289 | { | |
290 | struct platform_device *pdev = to_platform_device(dev); | |
291 | struct matrix_keypad *keypad = platform_get_drvdata(pdev); | |
292 | ||
293 | if (device_may_wakeup(&pdev->dev)) | |
294 | matrix_keypad_disable_wakeup(keypad); | |
bab7614d EM |
295 | |
296 | matrix_keypad_start(keypad->input_dev); | |
297 | ||
298 | return 0; | |
299 | } | |
bab7614d EM |
300 | #endif |
301 | ||
0508c19a DT |
302 | static SIMPLE_DEV_PM_OPS(matrix_keypad_pm_ops, |
303 | matrix_keypad_suspend, matrix_keypad_resume); | |
304 | ||
5298cc4c BP |
305 | static int matrix_keypad_init_gpio(struct platform_device *pdev, |
306 | struct matrix_keypad *keypad) | |
bab7614d EM |
307 | { |
308 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; | |
b83643eb | 309 | int i, err; |
bab7614d EM |
310 | |
311 | /* initialized strobe lines as outputs, activated */ | |
312 | for (i = 0; i < pdata->num_col_gpios; i++) { | |
313 | err = gpio_request(pdata->col_gpios[i], "matrix_kbd_col"); | |
314 | if (err) { | |
315 | dev_err(&pdev->dev, | |
316 | "failed to request GPIO%d for COL%d\n", | |
317 | pdata->col_gpios[i], i); | |
318 | goto err_free_cols; | |
319 | } | |
320 | ||
321 | gpio_direction_output(pdata->col_gpios[i], !pdata->active_low); | |
322 | } | |
323 | ||
324 | for (i = 0; i < pdata->num_row_gpios; i++) { | |
325 | err = gpio_request(pdata->row_gpios[i], "matrix_kbd_row"); | |
326 | if (err) { | |
327 | dev_err(&pdev->dev, | |
328 | "failed to request GPIO%d for ROW%d\n", | |
329 | pdata->row_gpios[i], i); | |
330 | goto err_free_rows; | |
331 | } | |
332 | ||
333 | gpio_direction_input(pdata->row_gpios[i]); | |
334 | } | |
335 | ||
fb76dd10 | 336 | if (pdata->clustered_irq > 0) { |
24e4d21c | 337 | err = request_any_context_irq(pdata->clustered_irq, |
bab7614d | 338 | matrix_keypad_interrupt, |
fb76dd10 | 339 | pdata->clustered_irq_flags, |
bab7614d | 340 | "matrix-keypad", keypad); |
24e4d21c | 341 | if (err < 0) { |
bab7614d | 342 | dev_err(&pdev->dev, |
fb76dd10 LF |
343 | "Unable to acquire clustered interrupt\n"); |
344 | goto err_free_rows; | |
345 | } | |
346 | } else { | |
347 | for (i = 0; i < pdata->num_row_gpios; i++) { | |
24e4d21c LW |
348 | err = request_any_context_irq( |
349 | gpio_to_irq(pdata->row_gpios[i]), | |
fb76dd10 | 350 | matrix_keypad_interrupt, |
fb76dd10 LF |
351 | IRQF_TRIGGER_RISING | |
352 | IRQF_TRIGGER_FALLING, | |
353 | "matrix-keypad", keypad); | |
24e4d21c | 354 | if (err < 0) { |
fb76dd10 | 355 | dev_err(&pdev->dev, |
b83643eb | 356 | "Unable to acquire interrupt for GPIO line %i\n", |
fb76dd10 LF |
357 | pdata->row_gpios[i]); |
358 | goto err_free_irqs; | |
359 | } | |
bab7614d EM |
360 | } |
361 | } | |
362 | ||
363 | /* initialized as disabled - enabled by input->open */ | |
364 | disable_row_irqs(keypad); | |
365 | return 0; | |
366 | ||
367 | err_free_irqs: | |
368 | while (--i >= 0) | |
369 | free_irq(gpio_to_irq(pdata->row_gpios[i]), keypad); | |
370 | i = pdata->num_row_gpios; | |
371 | err_free_rows: | |
372 | while (--i >= 0) | |
373 | gpio_free(pdata->row_gpios[i]); | |
374 | i = pdata->num_col_gpios; | |
375 | err_free_cols: | |
376 | while (--i >= 0) | |
377 | gpio_free(pdata->col_gpios[i]); | |
378 | ||
379 | return err; | |
380 | } | |
381 | ||
b83643eb DT |
382 | static void matrix_keypad_free_gpio(struct matrix_keypad *keypad) |
383 | { | |
384 | const struct matrix_keypad_platform_data *pdata = keypad->pdata; | |
385 | int i; | |
386 | ||
387 | if (pdata->clustered_irq > 0) { | |
388 | free_irq(pdata->clustered_irq, keypad); | |
389 | } else { | |
390 | for (i = 0; i < pdata->num_row_gpios; i++) | |
391 | free_irq(gpio_to_irq(pdata->row_gpios[i]), keypad); | |
392 | } | |
393 | ||
394 | for (i = 0; i < pdata->num_row_gpios; i++) | |
395 | gpio_free(pdata->row_gpios[i]); | |
396 | ||
397 | for (i = 0; i < pdata->num_col_gpios; i++) | |
398 | gpio_free(pdata->col_gpios[i]); | |
399 | } | |
400 | ||
4a83eecf | 401 | #ifdef CONFIG_OF |
5298cc4c | 402 | static struct matrix_keypad_platform_data * |
4a83eecf AC |
403 | matrix_keypad_parse_dt(struct device *dev) |
404 | { | |
405 | struct matrix_keypad_platform_data *pdata; | |
406 | struct device_node *np = dev->of_node; | |
407 | unsigned int *gpios; | |
e80beb27 | 408 | int i, nrow, ncol; |
4a83eecf AC |
409 | |
410 | if (!np) { | |
411 | dev_err(dev, "device lacks DT data\n"); | |
412 | return ERR_PTR(-ENODEV); | |
413 | } | |
414 | ||
415 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
416 | if (!pdata) { | |
417 | dev_err(dev, "could not allocate memory for platform data\n"); | |
418 | return ERR_PTR(-ENOMEM); | |
419 | } | |
420 | ||
e80beb27 GL |
421 | pdata->num_row_gpios = nrow = of_gpio_named_count(np, "row-gpios"); |
422 | pdata->num_col_gpios = ncol = of_gpio_named_count(np, "col-gpios"); | |
423 | if (nrow <= 0 || ncol <= 0) { | |
4a83eecf AC |
424 | dev_err(dev, "number of keypad rows/columns not specified\n"); |
425 | return ERR_PTR(-EINVAL); | |
426 | } | |
427 | ||
428 | if (of_get_property(np, "linux,no-autorepeat", NULL)) | |
429 | pdata->no_autorepeat = true; | |
aeda5003 DT |
430 | |
431 | pdata->wakeup = of_property_read_bool(np, "wakeup-source") || | |
432 | of_property_read_bool(np, "linux,wakeup"); /* legacy */ | |
433 | ||
4a83eecf AC |
434 | if (of_get_property(np, "gpio-activelow", NULL)) |
435 | pdata->active_low = true; | |
436 | ||
aa0e26bb DR |
437 | pdata->drive_inactive_cols = |
438 | of_property_read_bool(np, "drive-inactive-cols"); | |
439 | ||
4a83eecf AC |
440 | of_property_read_u32(np, "debounce-delay-ms", &pdata->debounce_ms); |
441 | of_property_read_u32(np, "col-scan-delay-us", | |
442 | &pdata->col_scan_delay_us); | |
443 | ||
444 | gpios = devm_kzalloc(dev, | |
445 | sizeof(unsigned int) * | |
446 | (pdata->num_row_gpios + pdata->num_col_gpios), | |
447 | GFP_KERNEL); | |
448 | if (!gpios) { | |
449 | dev_err(dev, "could not allocate memory for gpios\n"); | |
450 | return ERR_PTR(-ENOMEM); | |
451 | } | |
452 | ||
453 | for (i = 0; i < pdata->num_row_gpios; i++) | |
454 | gpios[i] = of_get_named_gpio(np, "row-gpios", i); | |
455 | ||
456 | for (i = 0; i < pdata->num_col_gpios; i++) | |
457 | gpios[pdata->num_row_gpios + i] = | |
458 | of_get_named_gpio(np, "col-gpios", i); | |
459 | ||
460 | pdata->row_gpios = gpios; | |
461 | pdata->col_gpios = &gpios[pdata->num_row_gpios]; | |
462 | ||
463 | return pdata; | |
464 | } | |
465 | #else | |
466 | static inline struct matrix_keypad_platform_data * | |
467 | matrix_keypad_parse_dt(struct device *dev) | |
468 | { | |
469 | dev_err(dev, "no platform data defined\n"); | |
470 | ||
471 | return ERR_PTR(-EINVAL); | |
472 | } | |
473 | #endif | |
474 | ||
5298cc4c | 475 | static int matrix_keypad_probe(struct platform_device *pdev) |
bab7614d EM |
476 | { |
477 | const struct matrix_keypad_platform_data *pdata; | |
bab7614d EM |
478 | struct matrix_keypad *keypad; |
479 | struct input_dev *input_dev; | |
bab7614d EM |
480 | int err; |
481 | ||
4a83eecf | 482 | pdata = dev_get_platdata(&pdev->dev); |
bab7614d | 483 | if (!pdata) { |
4a83eecf AC |
484 | pdata = matrix_keypad_parse_dt(&pdev->dev); |
485 | if (IS_ERR(pdata)) { | |
486 | dev_err(&pdev->dev, "no platform data defined\n"); | |
487 | return PTR_ERR(pdata); | |
488 | } | |
489 | } else if (!pdata->keymap_data) { | |
bab7614d EM |
490 | dev_err(&pdev->dev, "no keymap data defined\n"); |
491 | return -EINVAL; | |
492 | } | |
493 | ||
4a83eecf | 494 | keypad = kzalloc(sizeof(struct matrix_keypad), GFP_KERNEL); |
bab7614d | 495 | input_dev = input_allocate_device(); |
01111fcd | 496 | if (!keypad || !input_dev) { |
bab7614d EM |
497 | err = -ENOMEM; |
498 | goto err_free_mem; | |
499 | } | |
500 | ||
501 | keypad->input_dev = input_dev; | |
502 | keypad->pdata = pdata; | |
4a83eecf | 503 | keypad->row_shift = get_count_order(pdata->num_col_gpios); |
bab7614d EM |
504 | keypad->stopped = true; |
505 | INIT_DELAYED_WORK(&keypad->work, matrix_keypad_scan); | |
506 | spin_lock_init(&keypad->lock); | |
507 | ||
508 | input_dev->name = pdev->name; | |
509 | input_dev->id.bustype = BUS_HOST; | |
510 | input_dev->dev.parent = &pdev->dev; | |
bab7614d EM |
511 | input_dev->open = matrix_keypad_start; |
512 | input_dev->close = matrix_keypad_stop; | |
513 | ||
4a83eecf | 514 | err = matrix_keypad_build_keymap(pdata->keymap_data, NULL, |
1932811f DT |
515 | pdata->num_row_gpios, |
516 | pdata->num_col_gpios, | |
4a83eecf AC |
517 | NULL, input_dev); |
518 | if (err) { | |
519 | dev_err(&pdev->dev, "failed to build keymap\n"); | |
1932811f | 520 | goto err_free_mem; |
4a83eecf | 521 | } |
bab7614d | 522 | |
1932811f DT |
523 | if (!pdata->no_autorepeat) |
524 | __set_bit(EV_REP, input_dev->evbit); | |
bab7614d EM |
525 | input_set_capability(input_dev, EV_MSC, MSC_SCAN); |
526 | input_set_drvdata(input_dev, keypad); | |
527 | ||
b83643eb | 528 | err = matrix_keypad_init_gpio(pdev, keypad); |
bab7614d EM |
529 | if (err) |
530 | goto err_free_mem; | |
531 | ||
532 | err = input_register_device(keypad->input_dev); | |
533 | if (err) | |
b83643eb | 534 | goto err_free_gpio; |
bab7614d EM |
535 | |
536 | device_init_wakeup(&pdev->dev, pdata->wakeup); | |
537 | platform_set_drvdata(pdev, keypad); | |
538 | ||
539 | return 0; | |
540 | ||
b83643eb DT |
541 | err_free_gpio: |
542 | matrix_keypad_free_gpio(keypad); | |
bab7614d EM |
543 | err_free_mem: |
544 | input_free_device(input_dev); | |
bab7614d EM |
545 | kfree(keypad); |
546 | return err; | |
547 | } | |
548 | ||
e2619cf7 | 549 | static int matrix_keypad_remove(struct platform_device *pdev) |
bab7614d EM |
550 | { |
551 | struct matrix_keypad *keypad = platform_get_drvdata(pdev); | |
bab7614d | 552 | |
b83643eb | 553 | matrix_keypad_free_gpio(keypad); |
bab7614d | 554 | input_unregister_device(keypad->input_dev); |
bab7614d EM |
555 | kfree(keypad); |
556 | ||
557 | return 0; | |
558 | } | |
559 | ||
4a83eecf AC |
560 | #ifdef CONFIG_OF |
561 | static const struct of_device_id matrix_keypad_dt_match[] = { | |
562 | { .compatible = "gpio-matrix-keypad" }, | |
563 | { } | |
564 | }; | |
565 | MODULE_DEVICE_TABLE(of, matrix_keypad_dt_match); | |
566 | #endif | |
567 | ||
bab7614d EM |
568 | static struct platform_driver matrix_keypad_driver = { |
569 | .probe = matrix_keypad_probe, | |
1cb0aa88 | 570 | .remove = matrix_keypad_remove, |
bab7614d EM |
571 | .driver = { |
572 | .name = "matrix-keypad", | |
f72a28ab | 573 | .pm = &matrix_keypad_pm_ops, |
4a83eecf | 574 | .of_match_table = of_match_ptr(matrix_keypad_dt_match), |
bab7614d EM |
575 | }, |
576 | }; | |
5146c84f | 577 | module_platform_driver(matrix_keypad_driver); |
bab7614d EM |
578 | |
579 | MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); | |
580 | MODULE_DESCRIPTION("GPIO Driven Matrix Keypad Driver"); | |
581 | MODULE_LICENSE("GPL v2"); | |
582 | MODULE_ALIAS("platform:matrix-keypad"); |