1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // |
3 | // Driver for the IMX keypad port. |
4 | // Copyright (C) 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com> |
5 | |
6 | #include <linux/clk.h> |
7 | #include <linux/delay.h> |
8 | #include <linux/device.h> |
9 | #include <linux/err.h> |
10 | #include <linux/input.h> |
11 | #include <linux/input/matrix_keypad.h> |
12 | #include <linux/interrupt.h> |
13 | #include <linux/io.h> |
14 | #include <linux/jiffies.h> |
15 | #include <linux/kernel.h> |
16 | #include <linux/module.h> |
17 | #include <linux/of.h> |
18 | #include <linux/platform_device.h> |
19 | #include <linux/slab.h> |
20 | #include <linux/timer.h> |
21 | |
22 | /* |
23 | * Keypad Controller registers (halfword) |
24 | */ |
25 | #define KPCR 0x00 /* Keypad Control Register */ |
26 | |
27 | #define KPSR 0x02 /* Keypad Status Register */ |
28 | #define KBD_STAT_KPKD (0x1 << 0) /* Key Press Interrupt Status bit (w1c) */ |
29 | #define KBD_STAT_KPKR (0x1 << 1) /* Key Release Interrupt Status bit (w1c) */ |
30 | #define KBD_STAT_KDSC (0x1 << 2) /* Key Depress Synch Chain Status bit (w1c)*/ |
31 | #define (0x1 << 3) /* Key Release Synch Status bit (w1c)*/ |
32 | #define KBD_STAT_KDIE (0x1 << 8) /* Key Depress Interrupt Enable Status bit */ |
33 | #define KBD_STAT_KRIE (0x1 << 9) /* Key Release Interrupt Enable */ |
34 | #define KBD_STAT_KPPEN (0x1 << 10) /* Keypad Clock Enable */ |
35 | |
36 | #define KDDR 0x04 /* Keypad Data Direction Register */ |
37 | #define KPDR 0x06 /* Keypad Data Register */ |
38 | |
39 | #define MAX_MATRIX_KEY_ROWS 8 |
40 | #define MAX_MATRIX_KEY_COLS 8 |
41 | #define MATRIX_ROW_SHIFT 3 |
42 | |
43 | #define MAX_MATRIX_KEY_NUM (MAX_MATRIX_KEY_ROWS * MAX_MATRIX_KEY_COLS) |
44 | |
45 | struct imx_keypad { |
46 | |
47 | struct clk *clk; |
48 | struct input_dev *input_dev; |
49 | void __iomem *mmio_base; |
50 | |
51 | int irq; |
52 | struct timer_list check_matrix_timer; |
53 | |
54 | /* |
55 | * The matrix is stable only if no changes are detected after |
56 | * IMX_KEYPAD_SCANS_FOR_STABILITY scans |
57 | */ |
58 | #define IMX_KEYPAD_SCANS_FOR_STABILITY 3 |
59 | int stable_count; |
60 | |
61 | bool enabled; |
62 | |
63 | /* Masks for enabled rows/cols */ |
64 | unsigned short rows_en_mask; |
65 | unsigned short cols_en_mask; |
66 | |
67 | unsigned short keycodes[MAX_MATRIX_KEY_NUM]; |
68 | |
69 | /* |
70 | * Matrix states: |
71 | * -stable: achieved after a complete debounce process. |
72 | * -unstable: used in the debouncing process. |
73 | */ |
74 | unsigned short matrix_stable_state[MAX_MATRIX_KEY_COLS]; |
75 | unsigned short matrix_unstable_state[MAX_MATRIX_KEY_COLS]; |
76 | }; |
77 | |
78 | /* Scan the matrix and return the new state in *matrix_volatile_state. */ |
79 | static void imx_keypad_scan_matrix(struct imx_keypad *keypad, |
80 | unsigned short *matrix_volatile_state) |
81 | { |
82 | int col; |
83 | unsigned short reg_val; |
84 | |
85 | for (col = 0; col < MAX_MATRIX_KEY_COLS; col++) { |
86 | if ((keypad->cols_en_mask & (1 << col)) == 0) |
87 | continue; |
88 | /* |
89 | * Discharge keypad capacitance: |
90 | * 2. write 1s on column data. |
91 | * 3. configure columns as totem-pole to discharge capacitance. |
92 | * 4. configure columns as open-drain. |
93 | */ |
94 | reg_val = readw(addr: keypad->mmio_base + KPDR); |
95 | reg_val |= 0xff00; |
96 | writew(val: reg_val, addr: keypad->mmio_base + KPDR); |
97 | |
98 | reg_val = readw(addr: keypad->mmio_base + KPCR); |
99 | reg_val &= ~((keypad->cols_en_mask & 0xff) << 8); |
100 | writew(val: reg_val, addr: keypad->mmio_base + KPCR); |
101 | |
102 | udelay(2); |
103 | |
104 | reg_val = readw(addr: keypad->mmio_base + KPCR); |
105 | reg_val |= (keypad->cols_en_mask & 0xff) << 8; |
106 | writew(val: reg_val, addr: keypad->mmio_base + KPCR); |
107 | |
108 | /* |
109 | * 5. Write a single column to 0, others to 1. |
110 | * 6. Sample row inputs and save data. |
111 | * 7. Repeat steps 2 - 6 for remaining columns. |
112 | */ |
113 | reg_val = readw(addr: keypad->mmio_base + KPDR); |
114 | reg_val &= ~(1 << (8 + col)); |
115 | writew(val: reg_val, addr: keypad->mmio_base + KPDR); |
116 | |
117 | /* |
118 | * Delay added to avoid propagating the 0 from column to row |
119 | * when scanning. |
120 | */ |
121 | udelay(5); |
122 | |
123 | /* |
124 | * 1s in matrix_volatile_state[col] means key pressures |
125 | * throw data from non enabled rows. |
126 | */ |
127 | reg_val = readw(addr: keypad->mmio_base + KPDR); |
128 | matrix_volatile_state[col] = (~reg_val) & keypad->rows_en_mask; |
129 | } |
130 | |
131 | /* |
132 | * Return in standby mode: |
133 | * 9. write 0s to columns |
134 | */ |
135 | reg_val = readw(addr: keypad->mmio_base + KPDR); |
136 | reg_val &= 0x00ff; |
137 | writew(val: reg_val, addr: keypad->mmio_base + KPDR); |
138 | } |
139 | |
140 | /* |
141 | * Compare the new matrix state (volatile) with the stable one stored in |
142 | * keypad->matrix_stable_state and fire events if changes are detected. |
143 | */ |
144 | static void imx_keypad_fire_events(struct imx_keypad *keypad, |
145 | unsigned short *matrix_volatile_state) |
146 | { |
147 | struct input_dev *input_dev = keypad->input_dev; |
148 | int row, col; |
149 | |
150 | for (col = 0; col < MAX_MATRIX_KEY_COLS; col++) { |
151 | unsigned short bits_changed; |
152 | int code; |
153 | |
154 | if ((keypad->cols_en_mask & (1 << col)) == 0) |
155 | continue; /* Column is not enabled */ |
156 | |
157 | bits_changed = keypad->matrix_stable_state[col] ^ |
158 | matrix_volatile_state[col]; |
159 | |
160 | if (bits_changed == 0) |
161 | continue; /* Column does not contain changes */ |
162 | |
163 | for (row = 0; row < MAX_MATRIX_KEY_ROWS; row++) { |
164 | if ((keypad->rows_en_mask & (1 << row)) == 0) |
165 | continue; /* Row is not enabled */ |
166 | if ((bits_changed & (1 << row)) == 0) |
167 | continue; /* Row does not contain changes */ |
168 | |
169 | code = MATRIX_SCAN_CODE(row, col, MATRIX_ROW_SHIFT); |
170 | input_event(dev: input_dev, EV_MSC, MSC_SCAN, value: code); |
171 | input_report_key(dev: input_dev, code: keypad->keycodes[code], |
172 | value: matrix_volatile_state[col] & (1 << row)); |
173 | dev_dbg(&input_dev->dev, "Event code: %d, val: %d" , |
174 | keypad->keycodes[code], |
175 | matrix_volatile_state[col] & (1 << row)); |
176 | } |
177 | } |
178 | input_sync(dev: input_dev); |
179 | } |
180 | |
181 | /* |
182 | * imx_keypad_check_for_events is the timer handler. |
183 | */ |
184 | static void imx_keypad_check_for_events(struct timer_list *t) |
185 | { |
186 | struct imx_keypad *keypad = from_timer(keypad, t, check_matrix_timer); |
187 | unsigned short matrix_volatile_state[MAX_MATRIX_KEY_COLS]; |
188 | unsigned short reg_val; |
189 | bool state_changed, is_zero_matrix; |
190 | int i; |
191 | |
192 | memset(matrix_volatile_state, 0, sizeof(matrix_volatile_state)); |
193 | |
194 | imx_keypad_scan_matrix(keypad, matrix_volatile_state); |
195 | |
196 | state_changed = false; |
197 | for (i = 0; i < MAX_MATRIX_KEY_COLS; i++) { |
198 | if ((keypad->cols_en_mask & (1 << i)) == 0) |
199 | continue; |
200 | |
201 | if (keypad->matrix_unstable_state[i] ^ matrix_volatile_state[i]) { |
202 | state_changed = true; |
203 | break; |
204 | } |
205 | } |
206 | |
207 | /* |
208 | * If the matrix state is changed from the previous scan |
209 | * (Re)Begin the debouncing process, saving the new state in |
210 | * keypad->matrix_unstable_state. |
211 | * else |
212 | * Increase the count of number of scans with a stable state. |
213 | */ |
214 | if (state_changed) { |
215 | memcpy(keypad->matrix_unstable_state, matrix_volatile_state, |
216 | sizeof(matrix_volatile_state)); |
217 | keypad->stable_count = 0; |
218 | } else |
219 | keypad->stable_count++; |
220 | |
221 | /* |
222 | * If the matrix is not as stable as we want reschedule scan |
223 | * in the near future. |
224 | */ |
225 | if (keypad->stable_count < IMX_KEYPAD_SCANS_FOR_STABILITY) { |
226 | mod_timer(timer: &keypad->check_matrix_timer, |
227 | expires: jiffies + msecs_to_jiffies(m: 10)); |
228 | return; |
229 | } |
230 | |
231 | /* |
232 | * If the matrix state is stable, fire the events and save the new |
233 | * stable state. Note, if the matrix is kept stable for longer |
234 | * (keypad->stable_count > IMX_KEYPAD_SCANS_FOR_STABILITY) all |
235 | * events have already been generated. |
236 | */ |
237 | if (keypad->stable_count == IMX_KEYPAD_SCANS_FOR_STABILITY) { |
238 | imx_keypad_fire_events(keypad, matrix_volatile_state); |
239 | |
240 | memcpy(keypad->matrix_stable_state, matrix_volatile_state, |
241 | sizeof(matrix_volatile_state)); |
242 | } |
243 | |
244 | is_zero_matrix = true; |
245 | for (i = 0; i < MAX_MATRIX_KEY_COLS; i++) { |
246 | if (matrix_volatile_state[i] != 0) { |
247 | is_zero_matrix = false; |
248 | break; |
249 | } |
250 | } |
251 | |
252 | |
253 | if (is_zero_matrix) { |
254 | /* |
255 | * All keys have been released. Enable only the KDI |
256 | * interrupt for future key presses (clear the KDI |
257 | * status bit and its sync chain before that). |
258 | */ |
259 | reg_val = readw(addr: keypad->mmio_base + KPSR); |
260 | reg_val |= KBD_STAT_KPKD | KBD_STAT_KDSC; |
261 | writew(val: reg_val, addr: keypad->mmio_base + KPSR); |
262 | |
263 | reg_val = readw(addr: keypad->mmio_base + KPSR); |
264 | reg_val |= KBD_STAT_KDIE; |
265 | reg_val &= ~KBD_STAT_KRIE; |
266 | writew(val: reg_val, addr: keypad->mmio_base + KPSR); |
267 | } else { |
268 | /* |
269 | * Some keys are still pressed. Schedule a rescan in |
270 | * attempt to detect multiple key presses and enable |
271 | * the KRI interrupt to react quickly to key release |
272 | * event. |
273 | */ |
274 | mod_timer(timer: &keypad->check_matrix_timer, |
275 | expires: jiffies + msecs_to_jiffies(m: 60)); |
276 | |
277 | reg_val = readw(addr: keypad->mmio_base + KPSR); |
278 | reg_val |= KBD_STAT_KPKR | KBD_STAT_KRSS; |
279 | writew(val: reg_val, addr: keypad->mmio_base + KPSR); |
280 | |
281 | reg_val = readw(addr: keypad->mmio_base + KPSR); |
282 | reg_val |= KBD_STAT_KRIE; |
283 | reg_val &= ~KBD_STAT_KDIE; |
284 | writew(val: reg_val, addr: keypad->mmio_base + KPSR); |
285 | } |
286 | } |
287 | |
288 | static irqreturn_t imx_keypad_irq_handler(int irq, void *dev_id) |
289 | { |
290 | struct imx_keypad *keypad = dev_id; |
291 | unsigned short reg_val; |
292 | |
293 | reg_val = readw(addr: keypad->mmio_base + KPSR); |
294 | |
295 | /* Disable both interrupt types */ |
296 | reg_val &= ~(KBD_STAT_KRIE | KBD_STAT_KDIE); |
297 | /* Clear interrupts status bits */ |
298 | reg_val |= KBD_STAT_KPKR | KBD_STAT_KPKD; |
299 | writew(val: reg_val, addr: keypad->mmio_base + KPSR); |
300 | |
301 | if (keypad->enabled) { |
302 | /* The matrix is supposed to be changed */ |
303 | keypad->stable_count = 0; |
304 | |
305 | /* Schedule the scanning procedure near in the future */ |
306 | mod_timer(timer: &keypad->check_matrix_timer, |
307 | expires: jiffies + msecs_to_jiffies(m: 2)); |
308 | } |
309 | |
310 | return IRQ_HANDLED; |
311 | } |
312 | |
313 | static void imx_keypad_config(struct imx_keypad *keypad) |
314 | { |
315 | unsigned short reg_val; |
316 | |
317 | /* |
318 | * Include enabled rows in interrupt generation (KPCR[7:0]) |
319 | * Configure keypad columns as open-drain (KPCR[15:8]) |
320 | */ |
321 | reg_val = readw(addr: keypad->mmio_base + KPCR); |
322 | reg_val |= keypad->rows_en_mask & 0xff; /* rows */ |
323 | reg_val |= (keypad->cols_en_mask & 0xff) << 8; /* cols */ |
324 | writew(val: reg_val, addr: keypad->mmio_base + KPCR); |
325 | |
326 | /* Write 0's to KPDR[15:8] (Colums) */ |
327 | reg_val = readw(addr: keypad->mmio_base + KPDR); |
328 | reg_val &= 0x00ff; |
329 | writew(val: reg_val, addr: keypad->mmio_base + KPDR); |
330 | |
331 | /* Configure columns as output, rows as input (KDDR[15:0]) */ |
332 | writew(val: 0xff00, addr: keypad->mmio_base + KDDR); |
333 | |
334 | /* |
335 | * Clear Key Depress and Key Release status bit. |
336 | * Clear both synchronizer chain. |
337 | */ |
338 | reg_val = readw(addr: keypad->mmio_base + KPSR); |
339 | reg_val |= KBD_STAT_KPKR | KBD_STAT_KPKD | |
340 | KBD_STAT_KDSC | KBD_STAT_KRSS; |
341 | writew(val: reg_val, addr: keypad->mmio_base + KPSR); |
342 | |
343 | /* Enable KDI and disable KRI (avoid false release events). */ |
344 | reg_val |= KBD_STAT_KDIE; |
345 | reg_val &= ~KBD_STAT_KRIE; |
346 | writew(val: reg_val, addr: keypad->mmio_base + KPSR); |
347 | } |
348 | |
349 | static void imx_keypad_inhibit(struct imx_keypad *keypad) |
350 | { |
351 | unsigned short reg_val; |
352 | |
353 | /* Inhibit KDI and KRI interrupts. */ |
354 | reg_val = readw(addr: keypad->mmio_base + KPSR); |
355 | reg_val &= ~(KBD_STAT_KRIE | KBD_STAT_KDIE); |
356 | reg_val |= KBD_STAT_KPKR | KBD_STAT_KPKD; |
357 | writew(val: reg_val, addr: keypad->mmio_base + KPSR); |
358 | |
359 | /* Colums as open drain and disable all rows */ |
360 | reg_val = (keypad->cols_en_mask & 0xff) << 8; |
361 | writew(val: reg_val, addr: keypad->mmio_base + KPCR); |
362 | } |
363 | |
364 | static void imx_keypad_close(struct input_dev *dev) |
365 | { |
366 | struct imx_keypad *keypad = input_get_drvdata(dev); |
367 | |
368 | dev_dbg(&dev->dev, ">%s\n" , __func__); |
369 | |
370 | /* Mark keypad as being inactive */ |
371 | keypad->enabled = false; |
372 | synchronize_irq(irq: keypad->irq); |
373 | del_timer_sync(timer: &keypad->check_matrix_timer); |
374 | |
375 | imx_keypad_inhibit(keypad); |
376 | |
377 | /* Disable clock unit */ |
378 | clk_disable_unprepare(clk: keypad->clk); |
379 | } |
380 | |
381 | static int imx_keypad_open(struct input_dev *dev) |
382 | { |
383 | struct imx_keypad *keypad = input_get_drvdata(dev); |
384 | int error; |
385 | |
386 | dev_dbg(&dev->dev, ">%s\n" , __func__); |
387 | |
388 | /* Enable the kpp clock */ |
389 | error = clk_prepare_enable(clk: keypad->clk); |
390 | if (error) |
391 | return error; |
392 | |
393 | /* We became active from now */ |
394 | keypad->enabled = true; |
395 | |
396 | imx_keypad_config(keypad); |
397 | |
398 | /* Sanity control, not all the rows must be actived now. */ |
399 | if ((readw(addr: keypad->mmio_base + KPDR) & keypad->rows_en_mask) == 0) { |
400 | dev_err(&dev->dev, |
401 | "too many keys pressed, control pins initialisation\n" ); |
402 | goto open_err; |
403 | } |
404 | |
405 | return 0; |
406 | |
407 | open_err: |
408 | imx_keypad_close(dev); |
409 | return -EIO; |
410 | } |
411 | |
412 | static const struct of_device_id imx_keypad_of_match[] = { |
413 | { .compatible = "fsl,imx21-kpp" , }, |
414 | { /* sentinel */ } |
415 | }; |
416 | MODULE_DEVICE_TABLE(of, imx_keypad_of_match); |
417 | |
418 | static int imx_keypad_probe(struct platform_device *pdev) |
419 | { |
420 | struct imx_keypad *keypad; |
421 | struct input_dev *input_dev; |
422 | int irq, error, i, row, col; |
423 | |
424 | irq = platform_get_irq(pdev, 0); |
425 | if (irq < 0) |
426 | return irq; |
427 | |
428 | input_dev = devm_input_allocate_device(&pdev->dev); |
429 | if (!input_dev) { |
430 | dev_err(&pdev->dev, "failed to allocate the input device\n" ); |
431 | return -ENOMEM; |
432 | } |
433 | |
434 | keypad = devm_kzalloc(dev: &pdev->dev, size: sizeof(*keypad), GFP_KERNEL); |
435 | if (!keypad) { |
436 | dev_err(&pdev->dev, "not enough memory for driver data\n" ); |
437 | return -ENOMEM; |
438 | } |
439 | |
440 | keypad->input_dev = input_dev; |
441 | keypad->irq = irq; |
442 | keypad->stable_count = 0; |
443 | |
444 | timer_setup(&keypad->check_matrix_timer, |
445 | imx_keypad_check_for_events, 0); |
446 | |
447 | keypad->mmio_base = devm_platform_ioremap_resource(pdev, index: 0); |
448 | if (IS_ERR(ptr: keypad->mmio_base)) |
449 | return PTR_ERR(ptr: keypad->mmio_base); |
450 | |
451 | keypad->clk = devm_clk_get(dev: &pdev->dev, NULL); |
452 | if (IS_ERR(ptr: keypad->clk)) { |
453 | dev_err(&pdev->dev, "failed to get keypad clock\n" ); |
454 | return PTR_ERR(ptr: keypad->clk); |
455 | } |
456 | |
457 | /* Init the Input device */ |
458 | input_dev->name = pdev->name; |
459 | input_dev->id.bustype = BUS_HOST; |
460 | input_dev->dev.parent = &pdev->dev; |
461 | input_dev->open = imx_keypad_open; |
462 | input_dev->close = imx_keypad_close; |
463 | |
464 | error = matrix_keypad_build_keymap(NULL, NULL, |
465 | MAX_MATRIX_KEY_ROWS, |
466 | MAX_MATRIX_KEY_COLS, |
467 | keymap: keypad->keycodes, input_dev); |
468 | if (error) { |
469 | dev_err(&pdev->dev, "failed to build keymap\n" ); |
470 | return error; |
471 | } |
472 | |
473 | /* Search for rows and cols enabled */ |
474 | for (row = 0; row < MAX_MATRIX_KEY_ROWS; row++) { |
475 | for (col = 0; col < MAX_MATRIX_KEY_COLS; col++) { |
476 | i = MATRIX_SCAN_CODE(row, col, MATRIX_ROW_SHIFT); |
477 | if (keypad->keycodes[i] != KEY_RESERVED) { |
478 | keypad->rows_en_mask |= 1 << row; |
479 | keypad->cols_en_mask |= 1 << col; |
480 | } |
481 | } |
482 | } |
483 | dev_dbg(&pdev->dev, "enabled rows mask: %x\n" , keypad->rows_en_mask); |
484 | dev_dbg(&pdev->dev, "enabled cols mask: %x\n" , keypad->cols_en_mask); |
485 | |
486 | __set_bit(EV_REP, input_dev->evbit); |
487 | input_set_capability(dev: input_dev, EV_MSC, MSC_SCAN); |
488 | input_set_drvdata(dev: input_dev, data: keypad); |
489 | |
490 | /* Ensure that the keypad will stay dormant until opened */ |
491 | error = clk_prepare_enable(clk: keypad->clk); |
492 | if (error) |
493 | return error; |
494 | imx_keypad_inhibit(keypad); |
495 | clk_disable_unprepare(clk: keypad->clk); |
496 | |
497 | error = devm_request_irq(dev: &pdev->dev, irq, handler: imx_keypad_irq_handler, irqflags: 0, |
498 | devname: pdev->name, dev_id: keypad); |
499 | if (error) { |
500 | dev_err(&pdev->dev, "failed to request IRQ\n" ); |
501 | return error; |
502 | } |
503 | |
504 | /* Register the input device */ |
505 | error = input_register_device(input_dev); |
506 | if (error) { |
507 | dev_err(&pdev->dev, "failed to register input device\n" ); |
508 | return error; |
509 | } |
510 | |
511 | platform_set_drvdata(pdev, data: keypad); |
512 | device_init_wakeup(dev: &pdev->dev, enable: 1); |
513 | |
514 | return 0; |
515 | } |
516 | |
517 | static int __maybe_unused imx_kbd_noirq_suspend(struct device *dev) |
518 | { |
519 | struct platform_device *pdev = to_platform_device(dev); |
520 | struct imx_keypad *kbd = platform_get_drvdata(pdev); |
521 | struct input_dev *input_dev = kbd->input_dev; |
522 | unsigned short reg_val = readw(addr: kbd->mmio_base + KPSR); |
523 | |
524 | /* imx kbd can wake up system even clock is disabled */ |
525 | mutex_lock(&input_dev->mutex); |
526 | |
527 | if (input_device_enabled(dev: input_dev)) |
528 | clk_disable_unprepare(clk: kbd->clk); |
529 | |
530 | mutex_unlock(lock: &input_dev->mutex); |
531 | |
532 | if (device_may_wakeup(dev: &pdev->dev)) { |
533 | if (reg_val & KBD_STAT_KPKD) |
534 | reg_val |= KBD_STAT_KRIE; |
535 | if (reg_val & KBD_STAT_KPKR) |
536 | reg_val |= KBD_STAT_KDIE; |
537 | writew(val: reg_val, addr: kbd->mmio_base + KPSR); |
538 | |
539 | enable_irq_wake(irq: kbd->irq); |
540 | } |
541 | |
542 | return 0; |
543 | } |
544 | |
545 | static int __maybe_unused imx_kbd_noirq_resume(struct device *dev) |
546 | { |
547 | struct platform_device *pdev = to_platform_device(dev); |
548 | struct imx_keypad *kbd = platform_get_drvdata(pdev); |
549 | struct input_dev *input_dev = kbd->input_dev; |
550 | int ret = 0; |
551 | |
552 | if (device_may_wakeup(dev: &pdev->dev)) |
553 | disable_irq_wake(irq: kbd->irq); |
554 | |
555 | mutex_lock(&input_dev->mutex); |
556 | |
557 | if (input_device_enabled(dev: input_dev)) { |
558 | ret = clk_prepare_enable(clk: kbd->clk); |
559 | if (ret) |
560 | goto err_clk; |
561 | } |
562 | |
563 | err_clk: |
564 | mutex_unlock(lock: &input_dev->mutex); |
565 | |
566 | return ret; |
567 | } |
568 | |
569 | static const struct dev_pm_ops imx_kbd_pm_ops = { |
570 | SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx_kbd_noirq_suspend, imx_kbd_noirq_resume) |
571 | }; |
572 | |
573 | static struct platform_driver imx_keypad_driver = { |
574 | .driver = { |
575 | .name = "imx-keypad" , |
576 | .pm = &imx_kbd_pm_ops, |
577 | .of_match_table = imx_keypad_of_match, |
578 | }, |
579 | .probe = imx_keypad_probe, |
580 | }; |
581 | module_platform_driver(imx_keypad_driver); |
582 | |
583 | MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>" ); |
584 | MODULE_DESCRIPTION("IMX Keypad Port Driver" ); |
585 | MODULE_LICENSE("GPL v2" ); |
586 | MODULE_ALIAS("platform:imx-keypad" ); |
587 | |