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76cdc083 AP |
1 | /* |
2 | * Driver for the IMX keypad port. | |
3 | * Copyright (C) 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
76cdc083 AP |
8 | */ |
9 | ||
10 | #include <linux/clk.h> | |
11 | #include <linux/delay.h> | |
12 | #include <linux/device.h> | |
13 | #include <linux/err.h> | |
76cdc083 AP |
14 | #include <linux/input/matrix_keypad.h> |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/io.h> | |
17 | #include <linux/jiffies.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/module.h> | |
0e14235e | 20 | #include <linux/of.h> |
76cdc083 | 21 | #include <linux/platform_device.h> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
76cdc083 AP |
23 | #include <linux/timer.h> |
24 | ||
25 | /* | |
26 | * Keypad Controller registers (halfword) | |
27 | */ | |
28 | #define KPCR 0x00 /* Keypad Control Register */ | |
29 | ||
30 | #define KPSR 0x02 /* Keypad Status Register */ | |
31 | #define KBD_STAT_KPKD (0x1 << 0) /* Key Press Interrupt Status bit (w1c) */ | |
32 | #define KBD_STAT_KPKR (0x1 << 1) /* Key Release Interrupt Status bit (w1c) */ | |
33 | #define KBD_STAT_KDSC (0x1 << 2) /* Key Depress Synch Chain Status bit (w1c)*/ | |
34 | #define KBD_STAT_KRSS (0x1 << 3) /* Key Release Synch Status bit (w1c)*/ | |
35 | #define KBD_STAT_KDIE (0x1 << 8) /* Key Depress Interrupt Enable Status bit */ | |
36 | #define KBD_STAT_KRIE (0x1 << 9) /* Key Release Interrupt Enable */ | |
37 | #define KBD_STAT_KPPEN (0x1 << 10) /* Keypad Clock Enable */ | |
38 | ||
39 | #define KDDR 0x04 /* Keypad Data Direction Register */ | |
40 | #define KPDR 0x06 /* Keypad Data Register */ | |
41 | ||
42 | #define MAX_MATRIX_KEY_ROWS 8 | |
43 | #define MAX_MATRIX_KEY_COLS 8 | |
44 | #define MATRIX_ROW_SHIFT 3 | |
45 | ||
46 | #define MAX_MATRIX_KEY_NUM (MAX_MATRIX_KEY_ROWS * MAX_MATRIX_KEY_COLS) | |
47 | ||
48 | struct imx_keypad { | |
49 | ||
50 | struct clk *clk; | |
51 | struct input_dev *input_dev; | |
52 | void __iomem *mmio_base; | |
53 | ||
54 | int irq; | |
55 | struct timer_list check_matrix_timer; | |
56 | ||
57 | /* | |
58 | * The matrix is stable only if no changes are detected after | |
59 | * IMX_KEYPAD_SCANS_FOR_STABILITY scans | |
60 | */ | |
61 | #define IMX_KEYPAD_SCANS_FOR_STABILITY 3 | |
62 | int stable_count; | |
63 | ||
64 | bool enabled; | |
65 | ||
66 | /* Masks for enabled rows/cols */ | |
67 | unsigned short rows_en_mask; | |
68 | unsigned short cols_en_mask; | |
69 | ||
70 | unsigned short keycodes[MAX_MATRIX_KEY_NUM]; | |
71 | ||
72 | /* | |
73 | * Matrix states: | |
74 | * -stable: achieved after a complete debounce process. | |
75 | * -unstable: used in the debouncing process. | |
76 | */ | |
77 | unsigned short matrix_stable_state[MAX_MATRIX_KEY_COLS]; | |
78 | unsigned short matrix_unstable_state[MAX_MATRIX_KEY_COLS]; | |
79 | }; | |
80 | ||
81 | /* Scan the matrix and return the new state in *matrix_volatile_state. */ | |
82 | static void imx_keypad_scan_matrix(struct imx_keypad *keypad, | |
83 | unsigned short *matrix_volatile_state) | |
84 | { | |
85 | int col; | |
86 | unsigned short reg_val; | |
87 | ||
88 | for (col = 0; col < MAX_MATRIX_KEY_COLS; col++) { | |
89 | if ((keypad->cols_en_mask & (1 << col)) == 0) | |
90 | continue; | |
91 | /* | |
92 | * Discharge keypad capacitance: | |
93 | * 2. write 1s on column data. | |
94 | * 3. configure columns as totem-pole to discharge capacitance. | |
95 | * 4. configure columns as open-drain. | |
96 | */ | |
97 | reg_val = readw(keypad->mmio_base + KPDR); | |
98 | reg_val |= 0xff00; | |
99 | writew(reg_val, keypad->mmio_base + KPDR); | |
100 | ||
101 | reg_val = readw(keypad->mmio_base + KPCR); | |
102 | reg_val &= ~((keypad->cols_en_mask & 0xff) << 8); | |
103 | writew(reg_val, keypad->mmio_base + KPCR); | |
104 | ||
105 | udelay(2); | |
106 | ||
107 | reg_val = readw(keypad->mmio_base + KPCR); | |
108 | reg_val |= (keypad->cols_en_mask & 0xff) << 8; | |
109 | writew(reg_val, keypad->mmio_base + KPCR); | |
110 | ||
111 | /* | |
112 | * 5. Write a single column to 0, others to 1. | |
113 | * 6. Sample row inputs and save data. | |
114 | * 7. Repeat steps 2 - 6 for remaining columns. | |
115 | */ | |
116 | reg_val = readw(keypad->mmio_base + KPDR); | |
117 | reg_val &= ~(1 << (8 + col)); | |
118 | writew(reg_val, keypad->mmio_base + KPDR); | |
119 | ||
120 | /* | |
121 | * Delay added to avoid propagating the 0 from column to row | |
122 | * when scanning. | |
123 | */ | |
124 | udelay(5); | |
125 | ||
126 | /* | |
127 | * 1s in matrix_volatile_state[col] means key pressures | |
128 | * throw data from non enabled rows. | |
129 | */ | |
130 | reg_val = readw(keypad->mmio_base + KPDR); | |
131 | matrix_volatile_state[col] = (~reg_val) & keypad->rows_en_mask; | |
132 | } | |
133 | ||
134 | /* | |
135 | * Return in standby mode: | |
136 | * 9. write 0s to columns | |
137 | */ | |
138 | reg_val = readw(keypad->mmio_base + KPDR); | |
139 | reg_val &= 0x00ff; | |
140 | writew(reg_val, keypad->mmio_base + KPDR); | |
141 | } | |
142 | ||
143 | /* | |
144 | * Compare the new matrix state (volatile) with the stable one stored in | |
145 | * keypad->matrix_stable_state and fire events if changes are detected. | |
146 | */ | |
147 | static void imx_keypad_fire_events(struct imx_keypad *keypad, | |
148 | unsigned short *matrix_volatile_state) | |
149 | { | |
150 | struct input_dev *input_dev = keypad->input_dev; | |
151 | int row, col; | |
152 | ||
153 | for (col = 0; col < MAX_MATRIX_KEY_COLS; col++) { | |
154 | unsigned short bits_changed; | |
155 | int code; | |
156 | ||
157 | if ((keypad->cols_en_mask & (1 << col)) == 0) | |
158 | continue; /* Column is not enabled */ | |
159 | ||
160 | bits_changed = keypad->matrix_stable_state[col] ^ | |
161 | matrix_volatile_state[col]; | |
162 | ||
163 | if (bits_changed == 0) | |
164 | continue; /* Column does not contain changes */ | |
165 | ||
166 | for (row = 0; row < MAX_MATRIX_KEY_ROWS; row++) { | |
167 | if ((keypad->rows_en_mask & (1 << row)) == 0) | |
168 | continue; /* Row is not enabled */ | |
169 | if ((bits_changed & (1 << row)) == 0) | |
170 | continue; /* Row does not contain changes */ | |
171 | ||
172 | code = MATRIX_SCAN_CODE(row, col, MATRIX_ROW_SHIFT); | |
173 | input_event(input_dev, EV_MSC, MSC_SCAN, code); | |
174 | input_report_key(input_dev, keypad->keycodes[code], | |
175 | matrix_volatile_state[col] & (1 << row)); | |
176 | dev_dbg(&input_dev->dev, "Event code: %d, val: %d", | |
177 | keypad->keycodes[code], | |
178 | matrix_volatile_state[col] & (1 << row)); | |
179 | } | |
180 | } | |
181 | input_sync(input_dev); | |
182 | } | |
183 | ||
184 | /* | |
185 | * imx_keypad_check_for_events is the timer handler. | |
186 | */ | |
187 | static void imx_keypad_check_for_events(unsigned long data) | |
188 | { | |
189 | struct imx_keypad *keypad = (struct imx_keypad *) data; | |
190 | unsigned short matrix_volatile_state[MAX_MATRIX_KEY_COLS]; | |
191 | unsigned short reg_val; | |
192 | bool state_changed, is_zero_matrix; | |
193 | int i; | |
194 | ||
195 | memset(matrix_volatile_state, 0, sizeof(matrix_volatile_state)); | |
196 | ||
197 | imx_keypad_scan_matrix(keypad, matrix_volatile_state); | |
198 | ||
199 | state_changed = false; | |
200 | for (i = 0; i < MAX_MATRIX_KEY_COLS; i++) { | |
201 | if ((keypad->cols_en_mask & (1 << i)) == 0) | |
202 | continue; | |
203 | ||
204 | if (keypad->matrix_unstable_state[i] ^ matrix_volatile_state[i]) { | |
205 | state_changed = true; | |
206 | break; | |
207 | } | |
208 | } | |
209 | ||
210 | /* | |
211 | * If the matrix state is changed from the previous scan | |
212 | * (Re)Begin the debouncing process, saving the new state in | |
213 | * keypad->matrix_unstable_state. | |
214 | * else | |
215 | * Increase the count of number of scans with a stable state. | |
216 | */ | |
217 | if (state_changed) { | |
218 | memcpy(keypad->matrix_unstable_state, matrix_volatile_state, | |
219 | sizeof(matrix_volatile_state)); | |
220 | keypad->stable_count = 0; | |
221 | } else | |
222 | keypad->stable_count++; | |
223 | ||
224 | /* | |
225 | * If the matrix is not as stable as we want reschedule scan | |
226 | * in the near future. | |
227 | */ | |
228 | if (keypad->stable_count < IMX_KEYPAD_SCANS_FOR_STABILITY) { | |
229 | mod_timer(&keypad->check_matrix_timer, | |
230 | jiffies + msecs_to_jiffies(10)); | |
231 | return; | |
232 | } | |
233 | ||
234 | /* | |
235 | * If the matrix state is stable, fire the events and save the new | |
236 | * stable state. Note, if the matrix is kept stable for longer | |
237 | * (keypad->stable_count > IMX_KEYPAD_SCANS_FOR_STABILITY) all | |
238 | * events have already been generated. | |
239 | */ | |
240 | if (keypad->stable_count == IMX_KEYPAD_SCANS_FOR_STABILITY) { | |
241 | imx_keypad_fire_events(keypad, matrix_volatile_state); | |
242 | ||
243 | memcpy(keypad->matrix_stable_state, matrix_volatile_state, | |
244 | sizeof(matrix_volatile_state)); | |
245 | } | |
246 | ||
247 | is_zero_matrix = true; | |
248 | for (i = 0; i < MAX_MATRIX_KEY_COLS; i++) { | |
249 | if (matrix_volatile_state[i] != 0) { | |
250 | is_zero_matrix = false; | |
251 | break; | |
252 | } | |
253 | } | |
254 | ||
255 | ||
256 | if (is_zero_matrix) { | |
257 | /* | |
258 | * All keys have been released. Enable only the KDI | |
259 | * interrupt for future key presses (clear the KDI | |
260 | * status bit and its sync chain before that). | |
261 | */ | |
262 | reg_val = readw(keypad->mmio_base + KPSR); | |
263 | reg_val |= KBD_STAT_KPKD | KBD_STAT_KDSC; | |
264 | writew(reg_val, keypad->mmio_base + KPSR); | |
265 | ||
266 | reg_val = readw(keypad->mmio_base + KPSR); | |
267 | reg_val |= KBD_STAT_KDIE; | |
268 | reg_val &= ~KBD_STAT_KRIE; | |
269 | writew(reg_val, keypad->mmio_base + KPSR); | |
270 | } else { | |
271 | /* | |
272 | * Some keys are still pressed. Schedule a rescan in | |
273 | * attempt to detect multiple key presses and enable | |
274 | * the KRI interrupt to react quickly to key release | |
275 | * event. | |
276 | */ | |
277 | mod_timer(&keypad->check_matrix_timer, | |
278 | jiffies + msecs_to_jiffies(60)); | |
279 | ||
280 | reg_val = readw(keypad->mmio_base + KPSR); | |
281 | reg_val |= KBD_STAT_KPKR | KBD_STAT_KRSS; | |
282 | writew(reg_val, keypad->mmio_base + KPSR); | |
283 | ||
284 | reg_val = readw(keypad->mmio_base + KPSR); | |
285 | reg_val |= KBD_STAT_KRIE; | |
286 | reg_val &= ~KBD_STAT_KDIE; | |
287 | writew(reg_val, keypad->mmio_base + KPSR); | |
288 | } | |
289 | } | |
290 | ||
291 | static irqreturn_t imx_keypad_irq_handler(int irq, void *dev_id) | |
292 | { | |
293 | struct imx_keypad *keypad = dev_id; | |
294 | unsigned short reg_val; | |
295 | ||
296 | reg_val = readw(keypad->mmio_base + KPSR); | |
297 | ||
298 | /* Disable both interrupt types */ | |
299 | reg_val &= ~(KBD_STAT_KRIE | KBD_STAT_KDIE); | |
300 | /* Clear interrupts status bits */ | |
301 | reg_val |= KBD_STAT_KPKR | KBD_STAT_KPKD; | |
302 | writew(reg_val, keypad->mmio_base + KPSR); | |
303 | ||
304 | if (keypad->enabled) { | |
305 | /* The matrix is supposed to be changed */ | |
306 | keypad->stable_count = 0; | |
307 | ||
308 | /* Schedule the scanning procedure near in the future */ | |
309 | mod_timer(&keypad->check_matrix_timer, | |
310 | jiffies + msecs_to_jiffies(2)); | |
311 | } | |
312 | ||
313 | return IRQ_HANDLED; | |
314 | } | |
315 | ||
316 | static void imx_keypad_config(struct imx_keypad *keypad) | |
317 | { | |
318 | unsigned short reg_val; | |
319 | ||
320 | /* | |
321 | * Include enabled rows in interrupt generation (KPCR[7:0]) | |
322 | * Configure keypad columns as open-drain (KPCR[15:8]) | |
323 | */ | |
324 | reg_val = readw(keypad->mmio_base + KPCR); | |
325 | reg_val |= keypad->rows_en_mask & 0xff; /* rows */ | |
326 | reg_val |= (keypad->cols_en_mask & 0xff) << 8; /* cols */ | |
327 | writew(reg_val, keypad->mmio_base + KPCR); | |
328 | ||
329 | /* Write 0's to KPDR[15:8] (Colums) */ | |
330 | reg_val = readw(keypad->mmio_base + KPDR); | |
331 | reg_val &= 0x00ff; | |
332 | writew(reg_val, keypad->mmio_base + KPDR); | |
333 | ||
334 | /* Configure columns as output, rows as input (KDDR[15:0]) */ | |
335 | writew(0xff00, keypad->mmio_base + KDDR); | |
336 | ||
337 | /* | |
338 | * Clear Key Depress and Key Release status bit. | |
339 | * Clear both synchronizer chain. | |
340 | */ | |
341 | reg_val = readw(keypad->mmio_base + KPSR); | |
342 | reg_val |= KBD_STAT_KPKR | KBD_STAT_KPKD | | |
343 | KBD_STAT_KDSC | KBD_STAT_KRSS; | |
344 | writew(reg_val, keypad->mmio_base + KPSR); | |
345 | ||
346 | /* Enable KDI and disable KRI (avoid false release events). */ | |
347 | reg_val |= KBD_STAT_KDIE; | |
348 | reg_val &= ~KBD_STAT_KRIE; | |
349 | writew(reg_val, keypad->mmio_base + KPSR); | |
350 | } | |
351 | ||
352 | static void imx_keypad_inhibit(struct imx_keypad *keypad) | |
353 | { | |
354 | unsigned short reg_val; | |
355 | ||
356 | /* Inhibit KDI and KRI interrupts. */ | |
357 | reg_val = readw(keypad->mmio_base + KPSR); | |
358 | reg_val &= ~(KBD_STAT_KRIE | KBD_STAT_KDIE); | |
f35dd69b | 359 | reg_val |= KBD_STAT_KPKR | KBD_STAT_KPKD; |
76cdc083 AP |
360 | writew(reg_val, keypad->mmio_base + KPSR); |
361 | ||
362 | /* Colums as open drain and disable all rows */ | |
92aab960 AP |
363 | reg_val = (keypad->cols_en_mask & 0xff) << 8; |
364 | writew(reg_val, keypad->mmio_base + KPCR); | |
76cdc083 AP |
365 | } |
366 | ||
367 | static void imx_keypad_close(struct input_dev *dev) | |
368 | { | |
369 | struct imx_keypad *keypad = input_get_drvdata(dev); | |
370 | ||
371 | dev_dbg(&dev->dev, ">%s\n", __func__); | |
372 | ||
373 | /* Mark keypad as being inactive */ | |
374 | keypad->enabled = false; | |
375 | synchronize_irq(keypad->irq); | |
376 | del_timer_sync(&keypad->check_matrix_timer); | |
377 | ||
378 | imx_keypad_inhibit(keypad); | |
379 | ||
380 | /* Disable clock unit */ | |
a1e636e6 | 381 | clk_disable_unprepare(keypad->clk); |
76cdc083 AP |
382 | } |
383 | ||
384 | static int imx_keypad_open(struct input_dev *dev) | |
385 | { | |
386 | struct imx_keypad *keypad = input_get_drvdata(dev); | |
333fbe84 | 387 | int error; |
76cdc083 AP |
388 | |
389 | dev_dbg(&dev->dev, ">%s\n", __func__); | |
390 | ||
333fbe84 FE |
391 | /* Enable the kpp clock */ |
392 | error = clk_prepare_enable(keypad->clk); | |
393 | if (error) | |
394 | return error; | |
395 | ||
76cdc083 AP |
396 | /* We became active from now */ |
397 | keypad->enabled = true; | |
398 | ||
76cdc083 AP |
399 | imx_keypad_config(keypad); |
400 | ||
401 | /* Sanity control, not all the rows must be actived now. */ | |
402 | if ((readw(keypad->mmio_base + KPDR) & keypad->rows_en_mask) == 0) { | |
403 | dev_err(&dev->dev, | |
404 | "too many keys pressed, control pins initialisation\n"); | |
405 | goto open_err; | |
406 | } | |
407 | ||
408 | return 0; | |
409 | ||
410 | open_err: | |
411 | imx_keypad_close(dev); | |
412 | return -EIO; | |
413 | } | |
414 | ||
0e14235e | 415 | #ifdef CONFIG_OF |
27ec39c0 | 416 | static const struct of_device_id imx_keypad_of_match[] = { |
0e14235e LY |
417 | { .compatible = "fsl,imx21-kpp", }, |
418 | { /* sentinel */ } | |
419 | }; | |
420 | MODULE_DEVICE_TABLE(of, imx_keypad_of_match); | |
421 | #endif | |
422 | ||
5298cc4c | 423 | static int imx_keypad_probe(struct platform_device *pdev) |
76cdc083 | 424 | { |
c838cb3d JH |
425 | const struct matrix_keymap_data *keymap_data = |
426 | dev_get_platdata(&pdev->dev); | |
76cdc083 AP |
427 | struct imx_keypad *keypad; |
428 | struct input_dev *input_dev; | |
429 | struct resource *res; | |
0e14235e | 430 | int irq, error, i, row, col; |
76cdc083 | 431 | |
0e14235e | 432 | if (!keymap_data && !pdev->dev.of_node) { |
76cdc083 AP |
433 | dev_err(&pdev->dev, "no keymap defined\n"); |
434 | return -EINVAL; | |
435 | } | |
436 | ||
437 | irq = platform_get_irq(pdev, 0); | |
438 | if (irq < 0) { | |
439 | dev_err(&pdev->dev, "no irq defined in platform data\n"); | |
7fb45edb | 440 | return irq; |
76cdc083 AP |
441 | } |
442 | ||
da5bce19 | 443 | input_dev = devm_input_allocate_device(&pdev->dev); |
76cdc083 AP |
444 | if (!input_dev) { |
445 | dev_err(&pdev->dev, "failed to allocate the input device\n"); | |
da5bce19 | 446 | return -ENOMEM; |
76cdc083 AP |
447 | } |
448 | ||
061a5ad7 | 449 | keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad), GFP_KERNEL); |
76cdc083 AP |
450 | if (!keypad) { |
451 | dev_err(&pdev->dev, "not enough memory for driver data\n"); | |
da5bce19 | 452 | return -ENOMEM; |
76cdc083 AP |
453 | } |
454 | ||
455 | keypad->input_dev = input_dev; | |
456 | keypad->irq = irq; | |
457 | keypad->stable_count = 0; | |
458 | ||
459 | setup_timer(&keypad->check_matrix_timer, | |
460 | imx_keypad_check_for_events, (unsigned long) keypad); | |
461 | ||
ef0aca7f | 462 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
da5bce19 FE |
463 | keypad->mmio_base = devm_ioremap_resource(&pdev->dev, res); |
464 | if (IS_ERR(keypad->mmio_base)) | |
465 | return PTR_ERR(keypad->mmio_base); | |
76cdc083 | 466 | |
da5bce19 | 467 | keypad->clk = devm_clk_get(&pdev->dev, NULL); |
76cdc083 AP |
468 | if (IS_ERR(keypad->clk)) { |
469 | dev_err(&pdev->dev, "failed to get keypad clock\n"); | |
da5bce19 | 470 | return PTR_ERR(keypad->clk); |
76cdc083 AP |
471 | } |
472 | ||
76cdc083 AP |
473 | /* Init the Input device */ |
474 | input_dev->name = pdev->name; | |
475 | input_dev->id.bustype = BUS_HOST; | |
476 | input_dev->dev.parent = &pdev->dev; | |
477 | input_dev->open = imx_keypad_open; | |
478 | input_dev->close = imx_keypad_close; | |
76cdc083 | 479 | |
1932811f DT |
480 | error = matrix_keypad_build_keymap(keymap_data, NULL, |
481 | MAX_MATRIX_KEY_ROWS, | |
482 | MAX_MATRIX_KEY_COLS, | |
483 | keypad->keycodes, input_dev); | |
484 | if (error) { | |
485 | dev_err(&pdev->dev, "failed to build keymap\n"); | |
da5bce19 | 486 | return error; |
1932811f | 487 | } |
76cdc083 | 488 | |
0e14235e LY |
489 | /* Search for rows and cols enabled */ |
490 | for (row = 0; row < MAX_MATRIX_KEY_ROWS; row++) { | |
491 | for (col = 0; col < MAX_MATRIX_KEY_COLS; col++) { | |
492 | i = MATRIX_SCAN_CODE(row, col, MATRIX_ROW_SHIFT); | |
493 | if (keypad->keycodes[i] != KEY_RESERVED) { | |
494 | keypad->rows_en_mask |= 1 << row; | |
495 | keypad->cols_en_mask |= 1 << col; | |
496 | } | |
497 | } | |
498 | } | |
499 | dev_dbg(&pdev->dev, "enabled rows mask: %x\n", keypad->rows_en_mask); | |
500 | dev_dbg(&pdev->dev, "enabled cols mask: %x\n", keypad->cols_en_mask); | |
501 | ||
1932811f | 502 | __set_bit(EV_REP, input_dev->evbit); |
76cdc083 AP |
503 | input_set_capability(input_dev, EV_MSC, MSC_SCAN); |
504 | input_set_drvdata(input_dev, keypad); | |
505 | ||
506 | /* Ensure that the keypad will stay dormant until opened */ | |
e998200c FE |
507 | error = clk_prepare_enable(keypad->clk); |
508 | if (error) | |
509 | return error; | |
76cdc083 | 510 | imx_keypad_inhibit(keypad); |
609455f4 | 511 | clk_disable_unprepare(keypad->clk); |
76cdc083 | 512 | |
da5bce19 | 513 | error = devm_request_irq(&pdev->dev, irq, imx_keypad_irq_handler, 0, |
76cdc083 AP |
514 | pdev->name, keypad); |
515 | if (error) { | |
516 | dev_err(&pdev->dev, "failed to request IRQ\n"); | |
da5bce19 | 517 | return error; |
76cdc083 AP |
518 | } |
519 | ||
520 | /* Register the input device */ | |
521 | error = input_register_device(input_dev); | |
522 | if (error) { | |
523 | dev_err(&pdev->dev, "failed to register input device\n"); | |
da5bce19 | 524 | return error; |
76cdc083 AP |
525 | } |
526 | ||
527 | platform_set_drvdata(pdev, keypad); | |
528 | device_init_wakeup(&pdev->dev, 1); | |
529 | ||
76cdc083 AP |
530 | return 0; |
531 | } | |
532 | ||
e179d5fa | 533 | static int __maybe_unused imx_kbd_suspend(struct device *dev) |
81e8f2bc HW |
534 | { |
535 | struct platform_device *pdev = to_platform_device(dev); | |
536 | struct imx_keypad *kbd = platform_get_drvdata(pdev); | |
537 | struct input_dev *input_dev = kbd->input_dev; | |
538 | ||
539 | /* imx kbd can wake up system even clock is disabled */ | |
540 | mutex_lock(&input_dev->mutex); | |
541 | ||
542 | if (input_dev->users) | |
a1e636e6 | 543 | clk_disable_unprepare(kbd->clk); |
81e8f2bc HW |
544 | |
545 | mutex_unlock(&input_dev->mutex); | |
546 | ||
547 | if (device_may_wakeup(&pdev->dev)) | |
548 | enable_irq_wake(kbd->irq); | |
549 | ||
550 | return 0; | |
551 | } | |
552 | ||
e179d5fa | 553 | static int __maybe_unused imx_kbd_resume(struct device *dev) |
81e8f2bc HW |
554 | { |
555 | struct platform_device *pdev = to_platform_device(dev); | |
556 | struct imx_keypad *kbd = platform_get_drvdata(pdev); | |
557 | struct input_dev *input_dev = kbd->input_dev; | |
333fbe84 | 558 | int ret = 0; |
81e8f2bc HW |
559 | |
560 | if (device_may_wakeup(&pdev->dev)) | |
561 | disable_irq_wake(kbd->irq); | |
562 | ||
563 | mutex_lock(&input_dev->mutex); | |
564 | ||
333fbe84 FE |
565 | if (input_dev->users) { |
566 | ret = clk_prepare_enable(kbd->clk); | |
567 | if (ret) | |
568 | goto err_clk; | |
569 | } | |
81e8f2bc | 570 | |
333fbe84 | 571 | err_clk: |
81e8f2bc HW |
572 | mutex_unlock(&input_dev->mutex); |
573 | ||
333fbe84 | 574 | return ret; |
81e8f2bc | 575 | } |
81e8f2bc HW |
576 | |
577 | static SIMPLE_DEV_PM_OPS(imx_kbd_pm_ops, imx_kbd_suspend, imx_kbd_resume); | |
578 | ||
76cdc083 AP |
579 | static struct platform_driver imx_keypad_driver = { |
580 | .driver = { | |
581 | .name = "imx-keypad", | |
81e8f2bc | 582 | .pm = &imx_kbd_pm_ops, |
0e14235e | 583 | .of_match_table = of_match_ptr(imx_keypad_of_match), |
76cdc083 AP |
584 | }, |
585 | .probe = imx_keypad_probe, | |
76cdc083 | 586 | }; |
5146c84f | 587 | module_platform_driver(imx_keypad_driver); |
76cdc083 AP |
588 | |
589 | MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>"); | |
590 | MODULE_DESCRIPTION("IMX Keypad Port Driver"); | |
591 | MODULE_LICENSE("GPL v2"); | |
592 | MODULE_ALIAS("platform:imx-keypad"); |