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0eb70904 FE |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // | |
3 | // Driver for the IMX keypad port. | |
4 | // Copyright (C) 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com> | |
76cdc083 AP |
5 | |
6 | #include <linux/clk.h> | |
7 | #include <linux/delay.h> | |
8 | #include <linux/device.h> | |
9 | #include <linux/err.h> | |
76cdc083 AP |
10 | #include <linux/input/matrix_keypad.h> |
11 | #include <linux/interrupt.h> | |
12 | #include <linux/io.h> | |
13 | #include <linux/jiffies.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
0e14235e | 16 | #include <linux/of.h> |
76cdc083 | 17 | #include <linux/platform_device.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
76cdc083 AP |
19 | #include <linux/timer.h> |
20 | ||
21 | /* | |
22 | * Keypad Controller registers (halfword) | |
23 | */ | |
24 | #define KPCR 0x00 /* Keypad Control Register */ | |
25 | ||
26 | #define KPSR 0x02 /* Keypad Status Register */ | |
27 | #define KBD_STAT_KPKD (0x1 << 0) /* Key Press Interrupt Status bit (w1c) */ | |
28 | #define KBD_STAT_KPKR (0x1 << 1) /* Key Release Interrupt Status bit (w1c) */ | |
29 | #define KBD_STAT_KDSC (0x1 << 2) /* Key Depress Synch Chain Status bit (w1c)*/ | |
30 | #define KBD_STAT_KRSS (0x1 << 3) /* Key Release Synch Status bit (w1c)*/ | |
31 | #define KBD_STAT_KDIE (0x1 << 8) /* Key Depress Interrupt Enable Status bit */ | |
32 | #define KBD_STAT_KRIE (0x1 << 9) /* Key Release Interrupt Enable */ | |
33 | #define KBD_STAT_KPPEN (0x1 << 10) /* Keypad Clock Enable */ | |
34 | ||
35 | #define KDDR 0x04 /* Keypad Data Direction Register */ | |
36 | #define KPDR 0x06 /* Keypad Data Register */ | |
37 | ||
38 | #define MAX_MATRIX_KEY_ROWS 8 | |
39 | #define MAX_MATRIX_KEY_COLS 8 | |
40 | #define MATRIX_ROW_SHIFT 3 | |
41 | ||
42 | #define MAX_MATRIX_KEY_NUM (MAX_MATRIX_KEY_ROWS * MAX_MATRIX_KEY_COLS) | |
43 | ||
44 | struct imx_keypad { | |
45 | ||
46 | struct clk *clk; | |
47 | struct input_dev *input_dev; | |
48 | void __iomem *mmio_base; | |
49 | ||
50 | int irq; | |
51 | struct timer_list check_matrix_timer; | |
52 | ||
53 | /* | |
54 | * The matrix is stable only if no changes are detected after | |
55 | * IMX_KEYPAD_SCANS_FOR_STABILITY scans | |
56 | */ | |
57 | #define IMX_KEYPAD_SCANS_FOR_STABILITY 3 | |
58 | int stable_count; | |
59 | ||
60 | bool enabled; | |
61 | ||
62 | /* Masks for enabled rows/cols */ | |
63 | unsigned short rows_en_mask; | |
64 | unsigned short cols_en_mask; | |
65 | ||
66 | unsigned short keycodes[MAX_MATRIX_KEY_NUM]; | |
67 | ||
68 | /* | |
69 | * Matrix states: | |
70 | * -stable: achieved after a complete debounce process. | |
71 | * -unstable: used in the debouncing process. | |
72 | */ | |
73 | unsigned short matrix_stable_state[MAX_MATRIX_KEY_COLS]; | |
74 | unsigned short matrix_unstable_state[MAX_MATRIX_KEY_COLS]; | |
75 | }; | |
76 | ||
77 | /* Scan the matrix and return the new state in *matrix_volatile_state. */ | |
78 | static void imx_keypad_scan_matrix(struct imx_keypad *keypad, | |
79 | unsigned short *matrix_volatile_state) | |
80 | { | |
81 | int col; | |
82 | unsigned short reg_val; | |
83 | ||
84 | for (col = 0; col < MAX_MATRIX_KEY_COLS; col++) { | |
85 | if ((keypad->cols_en_mask & (1 << col)) == 0) | |
86 | continue; | |
87 | /* | |
88 | * Discharge keypad capacitance: | |
89 | * 2. write 1s on column data. | |
90 | * 3. configure columns as totem-pole to discharge capacitance. | |
91 | * 4. configure columns as open-drain. | |
92 | */ | |
93 | reg_val = readw(keypad->mmio_base + KPDR); | |
94 | reg_val |= 0xff00; | |
95 | writew(reg_val, keypad->mmio_base + KPDR); | |
96 | ||
97 | reg_val = readw(keypad->mmio_base + KPCR); | |
98 | reg_val &= ~((keypad->cols_en_mask & 0xff) << 8); | |
99 | writew(reg_val, keypad->mmio_base + KPCR); | |
100 | ||
101 | udelay(2); | |
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 | /* | |
108 | * 5. Write a single column to 0, others to 1. | |
109 | * 6. Sample row inputs and save data. | |
110 | * 7. Repeat steps 2 - 6 for remaining columns. | |
111 | */ | |
112 | reg_val = readw(keypad->mmio_base + KPDR); | |
113 | reg_val &= ~(1 << (8 + col)); | |
114 | writew(reg_val, keypad->mmio_base + KPDR); | |
115 | ||
116 | /* | |
117 | * Delay added to avoid propagating the 0 from column to row | |
118 | * when scanning. | |
119 | */ | |
120 | udelay(5); | |
121 | ||
122 | /* | |
123 | * 1s in matrix_volatile_state[col] means key pressures | |
124 | * throw data from non enabled rows. | |
125 | */ | |
126 | reg_val = readw(keypad->mmio_base + KPDR); | |
127 | matrix_volatile_state[col] = (~reg_val) & keypad->rows_en_mask; | |
128 | } | |
129 | ||
130 | /* | |
131 | * Return in standby mode: | |
132 | * 9. write 0s to columns | |
133 | */ | |
134 | reg_val = readw(keypad->mmio_base + KPDR); | |
135 | reg_val &= 0x00ff; | |
136 | writew(reg_val, keypad->mmio_base + KPDR); | |
137 | } | |
138 | ||
139 | /* | |
140 | * Compare the new matrix state (volatile) with the stable one stored in | |
141 | * keypad->matrix_stable_state and fire events if changes are detected. | |
142 | */ | |
143 | static void imx_keypad_fire_events(struct imx_keypad *keypad, | |
144 | unsigned short *matrix_volatile_state) | |
145 | { | |
146 | struct input_dev *input_dev = keypad->input_dev; | |
147 | int row, col; | |
148 | ||
149 | for (col = 0; col < MAX_MATRIX_KEY_COLS; col++) { | |
150 | unsigned short bits_changed; | |
151 | int code; | |
152 | ||
153 | if ((keypad->cols_en_mask & (1 << col)) == 0) | |
154 | continue; /* Column is not enabled */ | |
155 | ||
156 | bits_changed = keypad->matrix_stable_state[col] ^ | |
157 | matrix_volatile_state[col]; | |
158 | ||
159 | if (bits_changed == 0) | |
160 | continue; /* Column does not contain changes */ | |
161 | ||
162 | for (row = 0; row < MAX_MATRIX_KEY_ROWS; row++) { | |
163 | if ((keypad->rows_en_mask & (1 << row)) == 0) | |
164 | continue; /* Row is not enabled */ | |
165 | if ((bits_changed & (1 << row)) == 0) | |
166 | continue; /* Row does not contain changes */ | |
167 | ||
168 | code = MATRIX_SCAN_CODE(row, col, MATRIX_ROW_SHIFT); | |
169 | input_event(input_dev, EV_MSC, MSC_SCAN, code); | |
170 | input_report_key(input_dev, keypad->keycodes[code], | |
171 | matrix_volatile_state[col] & (1 << row)); | |
172 | dev_dbg(&input_dev->dev, "Event code: %d, val: %d", | |
173 | keypad->keycodes[code], | |
174 | matrix_volatile_state[col] & (1 << row)); | |
175 | } | |
176 | } | |
177 | input_sync(input_dev); | |
178 | } | |
179 | ||
180 | /* | |
181 | * imx_keypad_check_for_events is the timer handler. | |
182 | */ | |
4ea40278 | 183 | static void imx_keypad_check_for_events(struct timer_list *t) |
76cdc083 | 184 | { |
4ea40278 | 185 | struct imx_keypad *keypad = from_timer(keypad, t, check_matrix_timer); |
76cdc083 AP |
186 | unsigned short matrix_volatile_state[MAX_MATRIX_KEY_COLS]; |
187 | unsigned short reg_val; | |
188 | bool state_changed, is_zero_matrix; | |
189 | int i; | |
190 | ||
191 | memset(matrix_volatile_state, 0, sizeof(matrix_volatile_state)); | |
192 | ||
193 | imx_keypad_scan_matrix(keypad, matrix_volatile_state); | |
194 | ||
195 | state_changed = false; | |
196 | for (i = 0; i < MAX_MATRIX_KEY_COLS; i++) { | |
197 | if ((keypad->cols_en_mask & (1 << i)) == 0) | |
198 | continue; | |
199 | ||
200 | if (keypad->matrix_unstable_state[i] ^ matrix_volatile_state[i]) { | |
201 | state_changed = true; | |
202 | break; | |
203 | } | |
204 | } | |
205 | ||
206 | /* | |
207 | * If the matrix state is changed from the previous scan | |
208 | * (Re)Begin the debouncing process, saving the new state in | |
209 | * keypad->matrix_unstable_state. | |
210 | * else | |
211 | * Increase the count of number of scans with a stable state. | |
212 | */ | |
213 | if (state_changed) { | |
214 | memcpy(keypad->matrix_unstable_state, matrix_volatile_state, | |
215 | sizeof(matrix_volatile_state)); | |
216 | keypad->stable_count = 0; | |
217 | } else | |
218 | keypad->stable_count++; | |
219 | ||
220 | /* | |
221 | * If the matrix is not as stable as we want reschedule scan | |
222 | * in the near future. | |
223 | */ | |
224 | if (keypad->stable_count < IMX_KEYPAD_SCANS_FOR_STABILITY) { | |
225 | mod_timer(&keypad->check_matrix_timer, | |
226 | jiffies + msecs_to_jiffies(10)); | |
227 | return; | |
228 | } | |
229 | ||
230 | /* | |
231 | * If the matrix state is stable, fire the events and save the new | |
232 | * stable state. Note, if the matrix is kept stable for longer | |
233 | * (keypad->stable_count > IMX_KEYPAD_SCANS_FOR_STABILITY) all | |
234 | * events have already been generated. | |
235 | */ | |
236 | if (keypad->stable_count == IMX_KEYPAD_SCANS_FOR_STABILITY) { | |
237 | imx_keypad_fire_events(keypad, matrix_volatile_state); | |
238 | ||
239 | memcpy(keypad->matrix_stable_state, matrix_volatile_state, | |
240 | sizeof(matrix_volatile_state)); | |
241 | } | |
242 | ||
243 | is_zero_matrix = true; | |
244 | for (i = 0; i < MAX_MATRIX_KEY_COLS; i++) { | |
245 | if (matrix_volatile_state[i] != 0) { | |
246 | is_zero_matrix = false; | |
247 | break; | |
248 | } | |
249 | } | |
250 | ||
251 | ||
252 | if (is_zero_matrix) { | |
253 | /* | |
254 | * All keys have been released. Enable only the KDI | |
255 | * interrupt for future key presses (clear the KDI | |
256 | * status bit and its sync chain before that). | |
257 | */ | |
258 | reg_val = readw(keypad->mmio_base + KPSR); | |
259 | reg_val |= KBD_STAT_KPKD | KBD_STAT_KDSC; | |
260 | writew(reg_val, keypad->mmio_base + KPSR); | |
261 | ||
262 | reg_val = readw(keypad->mmio_base + KPSR); | |
263 | reg_val |= KBD_STAT_KDIE; | |
264 | reg_val &= ~KBD_STAT_KRIE; | |
265 | writew(reg_val, keypad->mmio_base + KPSR); | |
266 | } else { | |
267 | /* | |
268 | * Some keys are still pressed. Schedule a rescan in | |
269 | * attempt to detect multiple key presses and enable | |
270 | * the KRI interrupt to react quickly to key release | |
271 | * event. | |
272 | */ | |
273 | mod_timer(&keypad->check_matrix_timer, | |
274 | jiffies + msecs_to_jiffies(60)); | |
275 | ||
276 | reg_val = readw(keypad->mmio_base + KPSR); | |
277 | reg_val |= KBD_STAT_KPKR | KBD_STAT_KRSS; | |
278 | writew(reg_val, keypad->mmio_base + KPSR); | |
279 | ||
280 | reg_val = readw(keypad->mmio_base + KPSR); | |
281 | reg_val |= KBD_STAT_KRIE; | |
282 | reg_val &= ~KBD_STAT_KDIE; | |
283 | writew(reg_val, keypad->mmio_base + KPSR); | |
284 | } | |
285 | } | |
286 | ||
287 | static irqreturn_t imx_keypad_irq_handler(int irq, void *dev_id) | |
288 | { | |
289 | struct imx_keypad *keypad = dev_id; | |
290 | unsigned short reg_val; | |
291 | ||
292 | reg_val = readw(keypad->mmio_base + KPSR); | |
293 | ||
294 | /* Disable both interrupt types */ | |
295 | reg_val &= ~(KBD_STAT_KRIE | KBD_STAT_KDIE); | |
296 | /* Clear interrupts status bits */ | |
297 | reg_val |= KBD_STAT_KPKR | KBD_STAT_KPKD; | |
298 | writew(reg_val, keypad->mmio_base + KPSR); | |
299 | ||
300 | if (keypad->enabled) { | |
301 | /* The matrix is supposed to be changed */ | |
302 | keypad->stable_count = 0; | |
303 | ||
304 | /* Schedule the scanning procedure near in the future */ | |
305 | mod_timer(&keypad->check_matrix_timer, | |
306 | jiffies + msecs_to_jiffies(2)); | |
307 | } | |
308 | ||
309 | return IRQ_HANDLED; | |
310 | } | |
311 | ||
312 | static void imx_keypad_config(struct imx_keypad *keypad) | |
313 | { | |
314 | unsigned short reg_val; | |
315 | ||
316 | /* | |
317 | * Include enabled rows in interrupt generation (KPCR[7:0]) | |
318 | * Configure keypad columns as open-drain (KPCR[15:8]) | |
319 | */ | |
320 | reg_val = readw(keypad->mmio_base + KPCR); | |
321 | reg_val |= keypad->rows_en_mask & 0xff; /* rows */ | |
322 | reg_val |= (keypad->cols_en_mask & 0xff) << 8; /* cols */ | |
323 | writew(reg_val, keypad->mmio_base + KPCR); | |
324 | ||
325 | /* Write 0's to KPDR[15:8] (Colums) */ | |
326 | reg_val = readw(keypad->mmio_base + KPDR); | |
327 | reg_val &= 0x00ff; | |
328 | writew(reg_val, keypad->mmio_base + KPDR); | |
329 | ||
330 | /* Configure columns as output, rows as input (KDDR[15:0]) */ | |
331 | writew(0xff00, keypad->mmio_base + KDDR); | |
332 | ||
333 | /* | |
334 | * Clear Key Depress and Key Release status bit. | |
335 | * Clear both synchronizer chain. | |
336 | */ | |
337 | reg_val = readw(keypad->mmio_base + KPSR); | |
338 | reg_val |= KBD_STAT_KPKR | KBD_STAT_KPKD | | |
339 | KBD_STAT_KDSC | KBD_STAT_KRSS; | |
340 | writew(reg_val, keypad->mmio_base + KPSR); | |
341 | ||
342 | /* Enable KDI and disable KRI (avoid false release events). */ | |
343 | reg_val |= KBD_STAT_KDIE; | |
344 | reg_val &= ~KBD_STAT_KRIE; | |
345 | writew(reg_val, keypad->mmio_base + KPSR); | |
346 | } | |
347 | ||
348 | static void imx_keypad_inhibit(struct imx_keypad *keypad) | |
349 | { | |
350 | unsigned short reg_val; | |
351 | ||
352 | /* Inhibit KDI and KRI interrupts. */ | |
353 | reg_val = readw(keypad->mmio_base + KPSR); | |
354 | reg_val &= ~(KBD_STAT_KRIE | KBD_STAT_KDIE); | |
f35dd69b | 355 | reg_val |= KBD_STAT_KPKR | KBD_STAT_KPKD; |
76cdc083 AP |
356 | writew(reg_val, keypad->mmio_base + KPSR); |
357 | ||
358 | /* Colums as open drain and disable all rows */ | |
92aab960 AP |
359 | reg_val = (keypad->cols_en_mask & 0xff) << 8; |
360 | writew(reg_val, keypad->mmio_base + KPCR); | |
76cdc083 AP |
361 | } |
362 | ||
363 | static void imx_keypad_close(struct input_dev *dev) | |
364 | { | |
365 | struct imx_keypad *keypad = input_get_drvdata(dev); | |
366 | ||
367 | dev_dbg(&dev->dev, ">%s\n", __func__); | |
368 | ||
369 | /* Mark keypad as being inactive */ | |
370 | keypad->enabled = false; | |
371 | synchronize_irq(keypad->irq); | |
372 | del_timer_sync(&keypad->check_matrix_timer); | |
373 | ||
374 | imx_keypad_inhibit(keypad); | |
375 | ||
376 | /* Disable clock unit */ | |
a1e636e6 | 377 | clk_disable_unprepare(keypad->clk); |
76cdc083 AP |
378 | } |
379 | ||
380 | static int imx_keypad_open(struct input_dev *dev) | |
381 | { | |
382 | struct imx_keypad *keypad = input_get_drvdata(dev); | |
333fbe84 | 383 | int error; |
76cdc083 AP |
384 | |
385 | dev_dbg(&dev->dev, ">%s\n", __func__); | |
386 | ||
333fbe84 FE |
387 | /* Enable the kpp clock */ |
388 | error = clk_prepare_enable(keypad->clk); | |
389 | if (error) | |
390 | return error; | |
391 | ||
76cdc083 AP |
392 | /* We became active from now */ |
393 | keypad->enabled = true; | |
394 | ||
76cdc083 AP |
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 | ||
0e14235e | 411 | #ifdef CONFIG_OF |
27ec39c0 | 412 | static const struct of_device_id imx_keypad_of_match[] = { |
0e14235e LY |
413 | { .compatible = "fsl,imx21-kpp", }, |
414 | { /* sentinel */ } | |
415 | }; | |
416 | MODULE_DEVICE_TABLE(of, imx_keypad_of_match); | |
417 | #endif | |
418 | ||
5298cc4c | 419 | static int imx_keypad_probe(struct platform_device *pdev) |
76cdc083 | 420 | { |
c838cb3d JH |
421 | const struct matrix_keymap_data *keymap_data = |
422 | dev_get_platdata(&pdev->dev); | |
76cdc083 AP |
423 | struct imx_keypad *keypad; |
424 | struct input_dev *input_dev; | |
0e14235e | 425 | int irq, error, i, row, col; |
76cdc083 | 426 | |
0e14235e | 427 | if (!keymap_data && !pdev->dev.of_node) { |
76cdc083 AP |
428 | dev_err(&pdev->dev, "no keymap defined\n"); |
429 | return -EINVAL; | |
430 | } | |
431 | ||
432 | irq = platform_get_irq(pdev, 0); | |
433 | if (irq < 0) { | |
434 | dev_err(&pdev->dev, "no irq defined in platform data\n"); | |
7fb45edb | 435 | return irq; |
76cdc083 AP |
436 | } |
437 | ||
da5bce19 | 438 | input_dev = devm_input_allocate_device(&pdev->dev); |
76cdc083 AP |
439 | if (!input_dev) { |
440 | dev_err(&pdev->dev, "failed to allocate the input device\n"); | |
da5bce19 | 441 | return -ENOMEM; |
76cdc083 AP |
442 | } |
443 | ||
061a5ad7 | 444 | keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad), GFP_KERNEL); |
76cdc083 AP |
445 | if (!keypad) { |
446 | dev_err(&pdev->dev, "not enough memory for driver data\n"); | |
da5bce19 | 447 | return -ENOMEM; |
76cdc083 AP |
448 | } |
449 | ||
450 | keypad->input_dev = input_dev; | |
451 | keypad->irq = irq; | |
452 | keypad->stable_count = 0; | |
453 | ||
4ea40278 KC |
454 | timer_setup(&keypad->check_matrix_timer, |
455 | imx_keypad_check_for_events, 0); | |
76cdc083 | 456 | |
d8ea61c5 | 457 | keypad->mmio_base = devm_platform_ioremap_resource(pdev, 0); |
da5bce19 FE |
458 | if (IS_ERR(keypad->mmio_base)) |
459 | return PTR_ERR(keypad->mmio_base); | |
76cdc083 | 460 | |
da5bce19 | 461 | keypad->clk = devm_clk_get(&pdev->dev, NULL); |
76cdc083 AP |
462 | if (IS_ERR(keypad->clk)) { |
463 | dev_err(&pdev->dev, "failed to get keypad clock\n"); | |
da5bce19 | 464 | return PTR_ERR(keypad->clk); |
76cdc083 AP |
465 | } |
466 | ||
76cdc083 AP |
467 | /* Init the Input device */ |
468 | input_dev->name = pdev->name; | |
469 | input_dev->id.bustype = BUS_HOST; | |
470 | input_dev->dev.parent = &pdev->dev; | |
471 | input_dev->open = imx_keypad_open; | |
472 | input_dev->close = imx_keypad_close; | |
76cdc083 | 473 | |
1932811f DT |
474 | error = matrix_keypad_build_keymap(keymap_data, NULL, |
475 | MAX_MATRIX_KEY_ROWS, | |
476 | MAX_MATRIX_KEY_COLS, | |
477 | keypad->keycodes, input_dev); | |
478 | if (error) { | |
479 | dev_err(&pdev->dev, "failed to build keymap\n"); | |
da5bce19 | 480 | return error; |
1932811f | 481 | } |
76cdc083 | 482 | |
0e14235e LY |
483 | /* Search for rows and cols enabled */ |
484 | for (row = 0; row < MAX_MATRIX_KEY_ROWS; row++) { | |
485 | for (col = 0; col < MAX_MATRIX_KEY_COLS; col++) { | |
486 | i = MATRIX_SCAN_CODE(row, col, MATRIX_ROW_SHIFT); | |
487 | if (keypad->keycodes[i] != KEY_RESERVED) { | |
488 | keypad->rows_en_mask |= 1 << row; | |
489 | keypad->cols_en_mask |= 1 << col; | |
490 | } | |
491 | } | |
492 | } | |
493 | dev_dbg(&pdev->dev, "enabled rows mask: %x\n", keypad->rows_en_mask); | |
494 | dev_dbg(&pdev->dev, "enabled cols mask: %x\n", keypad->cols_en_mask); | |
495 | ||
1932811f | 496 | __set_bit(EV_REP, input_dev->evbit); |
76cdc083 AP |
497 | input_set_capability(input_dev, EV_MSC, MSC_SCAN); |
498 | input_set_drvdata(input_dev, keypad); | |
499 | ||
500 | /* Ensure that the keypad will stay dormant until opened */ | |
e998200c FE |
501 | error = clk_prepare_enable(keypad->clk); |
502 | if (error) | |
503 | return error; | |
76cdc083 | 504 | imx_keypad_inhibit(keypad); |
609455f4 | 505 | clk_disable_unprepare(keypad->clk); |
76cdc083 | 506 | |
da5bce19 | 507 | error = devm_request_irq(&pdev->dev, irq, imx_keypad_irq_handler, 0, |
76cdc083 AP |
508 | pdev->name, keypad); |
509 | if (error) { | |
510 | dev_err(&pdev->dev, "failed to request IRQ\n"); | |
da5bce19 | 511 | return error; |
76cdc083 AP |
512 | } |
513 | ||
514 | /* Register the input device */ | |
515 | error = input_register_device(input_dev); | |
516 | if (error) { | |
517 | dev_err(&pdev->dev, "failed to register input device\n"); | |
da5bce19 | 518 | return error; |
76cdc083 AP |
519 | } |
520 | ||
521 | platform_set_drvdata(pdev, keypad); | |
522 | device_init_wakeup(&pdev->dev, 1); | |
523 | ||
76cdc083 AP |
524 | return 0; |
525 | } | |
526 | ||
e179d5fa | 527 | static int __maybe_unused imx_kbd_suspend(struct device *dev) |
81e8f2bc HW |
528 | { |
529 | struct platform_device *pdev = to_platform_device(dev); | |
530 | struct imx_keypad *kbd = platform_get_drvdata(pdev); | |
531 | struct input_dev *input_dev = kbd->input_dev; | |
532 | ||
533 | /* imx kbd can wake up system even clock is disabled */ | |
534 | mutex_lock(&input_dev->mutex); | |
535 | ||
536 | if (input_dev->users) | |
a1e636e6 | 537 | clk_disable_unprepare(kbd->clk); |
81e8f2bc HW |
538 | |
539 | mutex_unlock(&input_dev->mutex); | |
540 | ||
541 | if (device_may_wakeup(&pdev->dev)) | |
542 | enable_irq_wake(kbd->irq); | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
e179d5fa | 547 | static int __maybe_unused imx_kbd_resume(struct device *dev) |
81e8f2bc HW |
548 | { |
549 | struct platform_device *pdev = to_platform_device(dev); | |
550 | struct imx_keypad *kbd = platform_get_drvdata(pdev); | |
551 | struct input_dev *input_dev = kbd->input_dev; | |
333fbe84 | 552 | int ret = 0; |
81e8f2bc HW |
553 | |
554 | if (device_may_wakeup(&pdev->dev)) | |
555 | disable_irq_wake(kbd->irq); | |
556 | ||
557 | mutex_lock(&input_dev->mutex); | |
558 | ||
333fbe84 FE |
559 | if (input_dev->users) { |
560 | ret = clk_prepare_enable(kbd->clk); | |
561 | if (ret) | |
562 | goto err_clk; | |
563 | } | |
81e8f2bc | 564 | |
333fbe84 | 565 | err_clk: |
81e8f2bc HW |
566 | mutex_unlock(&input_dev->mutex); |
567 | ||
333fbe84 | 568 | return ret; |
81e8f2bc | 569 | } |
81e8f2bc HW |
570 | |
571 | static SIMPLE_DEV_PM_OPS(imx_kbd_pm_ops, imx_kbd_suspend, imx_kbd_resume); | |
572 | ||
76cdc083 AP |
573 | static struct platform_driver imx_keypad_driver = { |
574 | .driver = { | |
575 | .name = "imx-keypad", | |
81e8f2bc | 576 | .pm = &imx_kbd_pm_ops, |
0e14235e | 577 | .of_match_table = of_match_ptr(imx_keypad_of_match), |
76cdc083 AP |
578 | }, |
579 | .probe = imx_keypad_probe, | |
76cdc083 | 580 | }; |
5146c84f | 581 | module_platform_driver(imx_keypad_driver); |
76cdc083 AP |
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"); |