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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. | |
8 | * | |
9 | * <<Power management needs to be implemented>>. | |
10 | */ | |
11 | ||
12 | #include <linux/clk.h> | |
13 | #include <linux/delay.h> | |
14 | #include <linux/device.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/input/matrix_keypad.h> | |
18 | #include <linux/interrupt.h> | |
19 | #include <linux/io.h> | |
20 | #include <linux/jiffies.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/platform_device.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
76cdc083 AP |
25 | #include <linux/timer.h> |
26 | ||
27 | /* | |
28 | * Keypad Controller registers (halfword) | |
29 | */ | |
30 | #define KPCR 0x00 /* Keypad Control Register */ | |
31 | ||
32 | #define KPSR 0x02 /* Keypad Status Register */ | |
33 | #define KBD_STAT_KPKD (0x1 << 0) /* Key Press Interrupt Status bit (w1c) */ | |
34 | #define KBD_STAT_KPKR (0x1 << 1) /* Key Release Interrupt Status bit (w1c) */ | |
35 | #define KBD_STAT_KDSC (0x1 << 2) /* Key Depress Synch Chain Status bit (w1c)*/ | |
36 | #define KBD_STAT_KRSS (0x1 << 3) /* Key Release Synch Status bit (w1c)*/ | |
37 | #define KBD_STAT_KDIE (0x1 << 8) /* Key Depress Interrupt Enable Status bit */ | |
38 | #define KBD_STAT_KRIE (0x1 << 9) /* Key Release Interrupt Enable */ | |
39 | #define KBD_STAT_KPPEN (0x1 << 10) /* Keypad Clock Enable */ | |
40 | ||
41 | #define KDDR 0x04 /* Keypad Data Direction Register */ | |
42 | #define KPDR 0x06 /* Keypad Data Register */ | |
43 | ||
44 | #define MAX_MATRIX_KEY_ROWS 8 | |
45 | #define MAX_MATRIX_KEY_COLS 8 | |
46 | #define MATRIX_ROW_SHIFT 3 | |
47 | ||
48 | #define MAX_MATRIX_KEY_NUM (MAX_MATRIX_KEY_ROWS * MAX_MATRIX_KEY_COLS) | |
49 | ||
50 | struct imx_keypad { | |
51 | ||
52 | struct clk *clk; | |
53 | struct input_dev *input_dev; | |
54 | void __iomem *mmio_base; | |
55 | ||
56 | int irq; | |
57 | struct timer_list check_matrix_timer; | |
58 | ||
59 | /* | |
60 | * The matrix is stable only if no changes are detected after | |
61 | * IMX_KEYPAD_SCANS_FOR_STABILITY scans | |
62 | */ | |
63 | #define IMX_KEYPAD_SCANS_FOR_STABILITY 3 | |
64 | int stable_count; | |
65 | ||
66 | bool enabled; | |
67 | ||
68 | /* Masks for enabled rows/cols */ | |
69 | unsigned short rows_en_mask; | |
70 | unsigned short cols_en_mask; | |
71 | ||
72 | unsigned short keycodes[MAX_MATRIX_KEY_NUM]; | |
73 | ||
74 | /* | |
75 | * Matrix states: | |
76 | * -stable: achieved after a complete debounce process. | |
77 | * -unstable: used in the debouncing process. | |
78 | */ | |
79 | unsigned short matrix_stable_state[MAX_MATRIX_KEY_COLS]; | |
80 | unsigned short matrix_unstable_state[MAX_MATRIX_KEY_COLS]; | |
81 | }; | |
82 | ||
83 | /* Scan the matrix and return the new state in *matrix_volatile_state. */ | |
84 | static void imx_keypad_scan_matrix(struct imx_keypad *keypad, | |
85 | unsigned short *matrix_volatile_state) | |
86 | { | |
87 | int col; | |
88 | unsigned short reg_val; | |
89 | ||
90 | for (col = 0; col < MAX_MATRIX_KEY_COLS; col++) { | |
91 | if ((keypad->cols_en_mask & (1 << col)) == 0) | |
92 | continue; | |
93 | /* | |
94 | * Discharge keypad capacitance: | |
95 | * 2. write 1s on column data. | |
96 | * 3. configure columns as totem-pole to discharge capacitance. | |
97 | * 4. configure columns as open-drain. | |
98 | */ | |
99 | reg_val = readw(keypad->mmio_base + KPDR); | |
100 | reg_val |= 0xff00; | |
101 | writew(reg_val, keypad->mmio_base + KPDR); | |
102 | ||
103 | reg_val = readw(keypad->mmio_base + KPCR); | |
104 | reg_val &= ~((keypad->cols_en_mask & 0xff) << 8); | |
105 | writew(reg_val, keypad->mmio_base + KPCR); | |
106 | ||
107 | udelay(2); | |
108 | ||
109 | reg_val = readw(keypad->mmio_base + KPCR); | |
110 | reg_val |= (keypad->cols_en_mask & 0xff) << 8; | |
111 | writew(reg_val, keypad->mmio_base + KPCR); | |
112 | ||
113 | /* | |
114 | * 5. Write a single column to 0, others to 1. | |
115 | * 6. Sample row inputs and save data. | |
116 | * 7. Repeat steps 2 - 6 for remaining columns. | |
117 | */ | |
118 | reg_val = readw(keypad->mmio_base + KPDR); | |
119 | reg_val &= ~(1 << (8 + col)); | |
120 | writew(reg_val, keypad->mmio_base + KPDR); | |
121 | ||
122 | /* | |
123 | * Delay added to avoid propagating the 0 from column to row | |
124 | * when scanning. | |
125 | */ | |
126 | udelay(5); | |
127 | ||
128 | /* | |
129 | * 1s in matrix_volatile_state[col] means key pressures | |
130 | * throw data from non enabled rows. | |
131 | */ | |
132 | reg_val = readw(keypad->mmio_base + KPDR); | |
133 | matrix_volatile_state[col] = (~reg_val) & keypad->rows_en_mask; | |
134 | } | |
135 | ||
136 | /* | |
137 | * Return in standby mode: | |
138 | * 9. write 0s to columns | |
139 | */ | |
140 | reg_val = readw(keypad->mmio_base + KPDR); | |
141 | reg_val &= 0x00ff; | |
142 | writew(reg_val, keypad->mmio_base + KPDR); | |
143 | } | |
144 | ||
145 | /* | |
146 | * Compare the new matrix state (volatile) with the stable one stored in | |
147 | * keypad->matrix_stable_state and fire events if changes are detected. | |
148 | */ | |
149 | static void imx_keypad_fire_events(struct imx_keypad *keypad, | |
150 | unsigned short *matrix_volatile_state) | |
151 | { | |
152 | struct input_dev *input_dev = keypad->input_dev; | |
153 | int row, col; | |
154 | ||
155 | for (col = 0; col < MAX_MATRIX_KEY_COLS; col++) { | |
156 | unsigned short bits_changed; | |
157 | int code; | |
158 | ||
159 | if ((keypad->cols_en_mask & (1 << col)) == 0) | |
160 | continue; /* Column is not enabled */ | |
161 | ||
162 | bits_changed = keypad->matrix_stable_state[col] ^ | |
163 | matrix_volatile_state[col]; | |
164 | ||
165 | if (bits_changed == 0) | |
166 | continue; /* Column does not contain changes */ | |
167 | ||
168 | for (row = 0; row < MAX_MATRIX_KEY_ROWS; row++) { | |
169 | if ((keypad->rows_en_mask & (1 << row)) == 0) | |
170 | continue; /* Row is not enabled */ | |
171 | if ((bits_changed & (1 << row)) == 0) | |
172 | continue; /* Row does not contain changes */ | |
173 | ||
174 | code = MATRIX_SCAN_CODE(row, col, MATRIX_ROW_SHIFT); | |
175 | input_event(input_dev, EV_MSC, MSC_SCAN, code); | |
176 | input_report_key(input_dev, keypad->keycodes[code], | |
177 | matrix_volatile_state[col] & (1 << row)); | |
178 | dev_dbg(&input_dev->dev, "Event code: %d, val: %d", | |
179 | keypad->keycodes[code], | |
180 | matrix_volatile_state[col] & (1 << row)); | |
181 | } | |
182 | } | |
183 | input_sync(input_dev); | |
184 | } | |
185 | ||
186 | /* | |
187 | * imx_keypad_check_for_events is the timer handler. | |
188 | */ | |
189 | static void imx_keypad_check_for_events(unsigned long data) | |
190 | { | |
191 | struct imx_keypad *keypad = (struct imx_keypad *) data; | |
192 | unsigned short matrix_volatile_state[MAX_MATRIX_KEY_COLS]; | |
193 | unsigned short reg_val; | |
194 | bool state_changed, is_zero_matrix; | |
195 | int i; | |
196 | ||
197 | memset(matrix_volatile_state, 0, sizeof(matrix_volatile_state)); | |
198 | ||
199 | imx_keypad_scan_matrix(keypad, matrix_volatile_state); | |
200 | ||
201 | state_changed = false; | |
202 | for (i = 0; i < MAX_MATRIX_KEY_COLS; i++) { | |
203 | if ((keypad->cols_en_mask & (1 << i)) == 0) | |
204 | continue; | |
205 | ||
206 | if (keypad->matrix_unstable_state[i] ^ matrix_volatile_state[i]) { | |
207 | state_changed = true; | |
208 | break; | |
209 | } | |
210 | } | |
211 | ||
212 | /* | |
213 | * If the matrix state is changed from the previous scan | |
214 | * (Re)Begin the debouncing process, saving the new state in | |
215 | * keypad->matrix_unstable_state. | |
216 | * else | |
217 | * Increase the count of number of scans with a stable state. | |
218 | */ | |
219 | if (state_changed) { | |
220 | memcpy(keypad->matrix_unstable_state, matrix_volatile_state, | |
221 | sizeof(matrix_volatile_state)); | |
222 | keypad->stable_count = 0; | |
223 | } else | |
224 | keypad->stable_count++; | |
225 | ||
226 | /* | |
227 | * If the matrix is not as stable as we want reschedule scan | |
228 | * in the near future. | |
229 | */ | |
230 | if (keypad->stable_count < IMX_KEYPAD_SCANS_FOR_STABILITY) { | |
231 | mod_timer(&keypad->check_matrix_timer, | |
232 | jiffies + msecs_to_jiffies(10)); | |
233 | return; | |
234 | } | |
235 | ||
236 | /* | |
237 | * If the matrix state is stable, fire the events and save the new | |
238 | * stable state. Note, if the matrix is kept stable for longer | |
239 | * (keypad->stable_count > IMX_KEYPAD_SCANS_FOR_STABILITY) all | |
240 | * events have already been generated. | |
241 | */ | |
242 | if (keypad->stable_count == IMX_KEYPAD_SCANS_FOR_STABILITY) { | |
243 | imx_keypad_fire_events(keypad, matrix_volatile_state); | |
244 | ||
245 | memcpy(keypad->matrix_stable_state, matrix_volatile_state, | |
246 | sizeof(matrix_volatile_state)); | |
247 | } | |
248 | ||
249 | is_zero_matrix = true; | |
250 | for (i = 0; i < MAX_MATRIX_KEY_COLS; i++) { | |
251 | if (matrix_volatile_state[i] != 0) { | |
252 | is_zero_matrix = false; | |
253 | break; | |
254 | } | |
255 | } | |
256 | ||
257 | ||
258 | if (is_zero_matrix) { | |
259 | /* | |
260 | * All keys have been released. Enable only the KDI | |
261 | * interrupt for future key presses (clear the KDI | |
262 | * status bit and its sync chain before that). | |
263 | */ | |
264 | reg_val = readw(keypad->mmio_base + KPSR); | |
265 | reg_val |= KBD_STAT_KPKD | KBD_STAT_KDSC; | |
266 | writew(reg_val, keypad->mmio_base + KPSR); | |
267 | ||
268 | reg_val = readw(keypad->mmio_base + KPSR); | |
269 | reg_val |= KBD_STAT_KDIE; | |
270 | reg_val &= ~KBD_STAT_KRIE; | |
271 | writew(reg_val, keypad->mmio_base + KPSR); | |
272 | } else { | |
273 | /* | |
274 | * Some keys are still pressed. Schedule a rescan in | |
275 | * attempt to detect multiple key presses and enable | |
276 | * the KRI interrupt to react quickly to key release | |
277 | * event. | |
278 | */ | |
279 | mod_timer(&keypad->check_matrix_timer, | |
280 | jiffies + msecs_to_jiffies(60)); | |
281 | ||
282 | reg_val = readw(keypad->mmio_base + KPSR); | |
283 | reg_val |= KBD_STAT_KPKR | KBD_STAT_KRSS; | |
284 | writew(reg_val, keypad->mmio_base + KPSR); | |
285 | ||
286 | reg_val = readw(keypad->mmio_base + KPSR); | |
287 | reg_val |= KBD_STAT_KRIE; | |
288 | reg_val &= ~KBD_STAT_KDIE; | |
289 | writew(reg_val, keypad->mmio_base + KPSR); | |
290 | } | |
291 | } | |
292 | ||
293 | static irqreturn_t imx_keypad_irq_handler(int irq, void *dev_id) | |
294 | { | |
295 | struct imx_keypad *keypad = dev_id; | |
296 | unsigned short reg_val; | |
297 | ||
298 | reg_val = readw(keypad->mmio_base + KPSR); | |
299 | ||
300 | /* Disable both interrupt types */ | |
301 | reg_val &= ~(KBD_STAT_KRIE | KBD_STAT_KDIE); | |
302 | /* Clear interrupts status bits */ | |
303 | reg_val |= KBD_STAT_KPKR | KBD_STAT_KPKD; | |
304 | writew(reg_val, keypad->mmio_base + KPSR); | |
305 | ||
306 | if (keypad->enabled) { | |
307 | /* The matrix is supposed to be changed */ | |
308 | keypad->stable_count = 0; | |
309 | ||
310 | /* Schedule the scanning procedure near in the future */ | |
311 | mod_timer(&keypad->check_matrix_timer, | |
312 | jiffies + msecs_to_jiffies(2)); | |
313 | } | |
314 | ||
315 | return IRQ_HANDLED; | |
316 | } | |
317 | ||
318 | static void imx_keypad_config(struct imx_keypad *keypad) | |
319 | { | |
320 | unsigned short reg_val; | |
321 | ||
322 | /* | |
323 | * Include enabled rows in interrupt generation (KPCR[7:0]) | |
324 | * Configure keypad columns as open-drain (KPCR[15:8]) | |
325 | */ | |
326 | reg_val = readw(keypad->mmio_base + KPCR); | |
327 | reg_val |= keypad->rows_en_mask & 0xff; /* rows */ | |
328 | reg_val |= (keypad->cols_en_mask & 0xff) << 8; /* cols */ | |
329 | writew(reg_val, keypad->mmio_base + KPCR); | |
330 | ||
331 | /* Write 0's to KPDR[15:8] (Colums) */ | |
332 | reg_val = readw(keypad->mmio_base + KPDR); | |
333 | reg_val &= 0x00ff; | |
334 | writew(reg_val, keypad->mmio_base + KPDR); | |
335 | ||
336 | /* Configure columns as output, rows as input (KDDR[15:0]) */ | |
337 | writew(0xff00, keypad->mmio_base + KDDR); | |
338 | ||
339 | /* | |
340 | * Clear Key Depress and Key Release status bit. | |
341 | * Clear both synchronizer chain. | |
342 | */ | |
343 | reg_val = readw(keypad->mmio_base + KPSR); | |
344 | reg_val |= KBD_STAT_KPKR | KBD_STAT_KPKD | | |
345 | KBD_STAT_KDSC | KBD_STAT_KRSS; | |
346 | writew(reg_val, keypad->mmio_base + KPSR); | |
347 | ||
348 | /* Enable KDI and disable KRI (avoid false release events). */ | |
349 | reg_val |= KBD_STAT_KDIE; | |
350 | reg_val &= ~KBD_STAT_KRIE; | |
351 | writew(reg_val, keypad->mmio_base + KPSR); | |
352 | } | |
353 | ||
354 | static void imx_keypad_inhibit(struct imx_keypad *keypad) | |
355 | { | |
356 | unsigned short reg_val; | |
357 | ||
358 | /* Inhibit KDI and KRI interrupts. */ | |
359 | reg_val = readw(keypad->mmio_base + KPSR); | |
360 | reg_val &= ~(KBD_STAT_KRIE | KBD_STAT_KDIE); | |
361 | writew(reg_val, keypad->mmio_base + KPSR); | |
362 | ||
363 | /* Colums as open drain and disable all rows */ | |
364 | writew(0xff00, keypad->mmio_base + KPCR); | |
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 */ | |
381 | clk_disable(keypad->clk); | |
382 | } | |
383 | ||
384 | static int imx_keypad_open(struct input_dev *dev) | |
385 | { | |
386 | struct imx_keypad *keypad = input_get_drvdata(dev); | |
387 | ||
388 | dev_dbg(&dev->dev, ">%s\n", __func__); | |
389 | ||
390 | /* We became active from now */ | |
391 | keypad->enabled = true; | |
392 | ||
393 | /* Enable the kpp clock */ | |
394 | clk_enable(keypad->clk); | |
395 | imx_keypad_config(keypad); | |
396 | ||
397 | /* Sanity control, not all the rows must be actived now. */ | |
398 | if ((readw(keypad->mmio_base + KPDR) & keypad->rows_en_mask) == 0) { | |
399 | dev_err(&dev->dev, | |
400 | "too many keys pressed, control pins initialisation\n"); | |
401 | goto open_err; | |
402 | } | |
403 | ||
404 | return 0; | |
405 | ||
406 | open_err: | |
407 | imx_keypad_close(dev); | |
408 | return -EIO; | |
409 | } | |
410 | ||
411 | static int __devinit imx_keypad_probe(struct platform_device *pdev) | |
412 | { | |
413 | const struct matrix_keymap_data *keymap_data = pdev->dev.platform_data; | |
414 | struct imx_keypad *keypad; | |
415 | struct input_dev *input_dev; | |
416 | struct resource *res; | |
417 | int irq, error, i; | |
418 | ||
419 | if (keymap_data == NULL) { | |
420 | dev_err(&pdev->dev, "no keymap defined\n"); | |
421 | return -EINVAL; | |
422 | } | |
423 | ||
424 | irq = platform_get_irq(pdev, 0); | |
425 | if (irq < 0) { | |
426 | dev_err(&pdev->dev, "no irq defined in platform data\n"); | |
427 | return -EINVAL; | |
428 | } | |
429 | ||
430 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
431 | if (res == NULL) { | |
432 | dev_err(&pdev->dev, "no I/O memory defined in platform data\n"); | |
433 | return -EINVAL; | |
434 | } | |
435 | ||
436 | res = request_mem_region(res->start, resource_size(res), pdev->name); | |
437 | if (res == NULL) { | |
438 | dev_err(&pdev->dev, "failed to request I/O memory\n"); | |
439 | return -EBUSY; | |
440 | } | |
441 | ||
442 | input_dev = input_allocate_device(); | |
443 | if (!input_dev) { | |
444 | dev_err(&pdev->dev, "failed to allocate the input device\n"); | |
445 | error = -ENOMEM; | |
446 | goto failed_rel_mem; | |
447 | } | |
448 | ||
449 | keypad = kzalloc(sizeof(struct imx_keypad), GFP_KERNEL); | |
450 | if (!keypad) { | |
451 | dev_err(&pdev->dev, "not enough memory for driver data\n"); | |
452 | error = -ENOMEM; | |
453 | goto failed_free_input; | |
454 | } | |
455 | ||
456 | keypad->input_dev = input_dev; | |
457 | keypad->irq = irq; | |
458 | keypad->stable_count = 0; | |
459 | ||
460 | setup_timer(&keypad->check_matrix_timer, | |
461 | imx_keypad_check_for_events, (unsigned long) keypad); | |
462 | ||
463 | keypad->mmio_base = ioremap(res->start, resource_size(res)); | |
464 | if (keypad->mmio_base == NULL) { | |
465 | dev_err(&pdev->dev, "failed to remap I/O memory\n"); | |
466 | error = -ENOMEM; | |
467 | goto failed_free_priv; | |
468 | } | |
469 | ||
470 | keypad->clk = clk_get(&pdev->dev, "kpp"); | |
471 | if (IS_ERR(keypad->clk)) { | |
472 | dev_err(&pdev->dev, "failed to get keypad clock\n"); | |
473 | error = PTR_ERR(keypad->clk); | |
474 | goto failed_unmap; | |
475 | } | |
476 | ||
477 | /* Search for rows and cols enabled */ | |
478 | for (i = 0; i < keymap_data->keymap_size; i++) { | |
479 | keypad->rows_en_mask |= 1 << KEY_ROW(keymap_data->keymap[i]); | |
480 | keypad->cols_en_mask |= 1 << KEY_COL(keymap_data->keymap[i]); | |
481 | } | |
482 | ||
483 | if (keypad->rows_en_mask > ((1 << MAX_MATRIX_KEY_ROWS) - 1) || | |
484 | keypad->cols_en_mask > ((1 << MAX_MATRIX_KEY_COLS) - 1)) { | |
485 | dev_err(&pdev->dev, | |
486 | "invalid key data (too many rows or colums)\n"); | |
487 | error = -EINVAL; | |
488 | goto failed_clock_put; | |
489 | } | |
490 | dev_dbg(&pdev->dev, "enabled rows mask: %x\n", keypad->rows_en_mask); | |
491 | dev_dbg(&pdev->dev, "enabled cols mask: %x\n", keypad->cols_en_mask); | |
492 | ||
493 | /* Init the Input device */ | |
494 | input_dev->name = pdev->name; | |
495 | input_dev->id.bustype = BUS_HOST; | |
496 | input_dev->dev.parent = &pdev->dev; | |
497 | input_dev->open = imx_keypad_open; | |
498 | input_dev->close = imx_keypad_close; | |
499 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP); | |
500 | input_dev->keycode = keypad->keycodes; | |
501 | input_dev->keycodesize = sizeof(keypad->keycodes[0]); | |
502 | input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes); | |
503 | ||
504 | matrix_keypad_build_keymap(keymap_data, MATRIX_ROW_SHIFT, | |
505 | keypad->keycodes, input_dev->keybit); | |
506 | ||
507 | input_set_capability(input_dev, EV_MSC, MSC_SCAN); | |
508 | input_set_drvdata(input_dev, keypad); | |
509 | ||
510 | /* Ensure that the keypad will stay dormant until opened */ | |
511 | imx_keypad_inhibit(keypad); | |
512 | ||
ec4665c4 | 513 | error = request_irq(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"); | |
517 | goto failed_clock_put; | |
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"); | |
524 | goto failed_free_irq; | |
525 | } | |
526 | ||
527 | platform_set_drvdata(pdev, keypad); | |
528 | device_init_wakeup(&pdev->dev, 1); | |
529 | ||
530 | return 0; | |
531 | ||
532 | failed_free_irq: | |
533 | free_irq(irq, pdev); | |
534 | failed_clock_put: | |
535 | clk_put(keypad->clk); | |
536 | failed_unmap: | |
537 | iounmap(keypad->mmio_base); | |
538 | failed_free_priv: | |
539 | kfree(keypad); | |
540 | failed_free_input: | |
541 | input_free_device(input_dev); | |
542 | failed_rel_mem: | |
543 | release_mem_region(res->start, resource_size(res)); | |
544 | return error; | |
545 | } | |
546 | ||
547 | static int __devexit imx_keypad_remove(struct platform_device *pdev) | |
548 | { | |
549 | struct imx_keypad *keypad = platform_get_drvdata(pdev); | |
550 | struct resource *res; | |
551 | ||
552 | dev_dbg(&pdev->dev, ">%s\n", __func__); | |
553 | ||
554 | platform_set_drvdata(pdev, NULL); | |
555 | ||
556 | input_unregister_device(keypad->input_dev); | |
557 | ||
558 | free_irq(keypad->irq, keypad); | |
559 | clk_put(keypad->clk); | |
560 | ||
561 | iounmap(keypad->mmio_base); | |
562 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
563 | release_mem_region(res->start, resource_size(res)); | |
564 | ||
565 | kfree(keypad); | |
566 | ||
567 | return 0; | |
568 | } | |
569 | ||
81e8f2bc HW |
570 | #ifdef CONFIG_PM_SLEEP |
571 | static int imx_kbd_suspend(struct device *dev) | |
572 | { | |
573 | struct platform_device *pdev = to_platform_device(dev); | |
574 | struct imx_keypad *kbd = platform_get_drvdata(pdev); | |
575 | struct input_dev *input_dev = kbd->input_dev; | |
576 | ||
577 | /* imx kbd can wake up system even clock is disabled */ | |
578 | mutex_lock(&input_dev->mutex); | |
579 | ||
580 | if (input_dev->users) | |
581 | clk_disable(kbd->clk); | |
582 | ||
583 | mutex_unlock(&input_dev->mutex); | |
584 | ||
585 | if (device_may_wakeup(&pdev->dev)) | |
586 | enable_irq_wake(kbd->irq); | |
587 | ||
588 | return 0; | |
589 | } | |
590 | ||
591 | static int imx_kbd_resume(struct device *dev) | |
592 | { | |
593 | struct platform_device *pdev = to_platform_device(dev); | |
594 | struct imx_keypad *kbd = platform_get_drvdata(pdev); | |
595 | struct input_dev *input_dev = kbd->input_dev; | |
596 | ||
597 | if (device_may_wakeup(&pdev->dev)) | |
598 | disable_irq_wake(kbd->irq); | |
599 | ||
600 | mutex_lock(&input_dev->mutex); | |
601 | ||
602 | if (input_dev->users) | |
603 | clk_enable(kbd->clk); | |
604 | ||
605 | mutex_unlock(&input_dev->mutex); | |
606 | ||
607 | return 0; | |
608 | } | |
609 | #endif | |
610 | ||
611 | static SIMPLE_DEV_PM_OPS(imx_kbd_pm_ops, imx_kbd_suspend, imx_kbd_resume); | |
612 | ||
76cdc083 AP |
613 | static struct platform_driver imx_keypad_driver = { |
614 | .driver = { | |
615 | .name = "imx-keypad", | |
616 | .owner = THIS_MODULE, | |
81e8f2bc | 617 | .pm = &imx_kbd_pm_ops, |
76cdc083 AP |
618 | }, |
619 | .probe = imx_keypad_probe, | |
620 | .remove = __devexit_p(imx_keypad_remove), | |
621 | }; | |
5146c84f | 622 | module_platform_driver(imx_keypad_driver); |
76cdc083 AP |
623 | |
624 | MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>"); | |
625 | MODULE_DESCRIPTION("IMX Keypad Port Driver"); | |
626 | MODULE_LICENSE("GPL v2"); | |
627 | MODULE_ALIAS("platform:imx-keypad"); |