This source file includes following definitions.
- samsung_keypad_scan
- samsung_keypad_report
- samsung_keypad_irq
- samsung_keypad_start
- samsung_keypad_stop
- samsung_keypad_open
- samsung_keypad_close
- samsung_keypad_parse_dt
- samsung_keypad_parse_dt
- samsung_keypad_probe
- samsung_keypad_remove
- samsung_keypad_runtime_suspend
- samsung_keypad_runtime_resume
- samsung_keypad_toggle_wakeup
- samsung_keypad_suspend
- samsung_keypad_resume
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9
10 #include <linux/clk.h>
11 #include <linux/delay.h>
12 #include <linux/err.h>
13 #include <linux/input.h>
14 #include <linux/interrupt.h>
15 #include <linux/io.h>
16 #include <linux/module.h>
17 #include <linux/platform_device.h>
18 #include <linux/pm.h>
19 #include <linux/pm_runtime.h>
20 #include <linux/slab.h>
21 #include <linux/of.h>
22 #include <linux/sched.h>
23 #include <linux/input/samsung-keypad.h>
24
25 #define SAMSUNG_KEYIFCON 0x00
26 #define SAMSUNG_KEYIFSTSCLR 0x04
27 #define SAMSUNG_KEYIFCOL 0x08
28 #define SAMSUNG_KEYIFROW 0x0c
29 #define SAMSUNG_KEYIFFC 0x10
30
31
32 #define SAMSUNG_KEYIFCON_INT_F_EN (1 << 0)
33 #define SAMSUNG_KEYIFCON_INT_R_EN (1 << 1)
34 #define SAMSUNG_KEYIFCON_DF_EN (1 << 2)
35 #define SAMSUNG_KEYIFCON_FC_EN (1 << 3)
36 #define SAMSUNG_KEYIFCON_WAKEUPEN (1 << 4)
37
38
39 #define SAMSUNG_KEYIFSTSCLR_P_INT_MASK (0xff << 0)
40 #define SAMSUNG_KEYIFSTSCLR_R_INT_MASK (0xff << 8)
41 #define SAMSUNG_KEYIFSTSCLR_R_INT_OFFSET 8
42 #define S5PV210_KEYIFSTSCLR_P_INT_MASK (0x3fff << 0)
43 #define S5PV210_KEYIFSTSCLR_R_INT_MASK (0x3fff << 16)
44 #define S5PV210_KEYIFSTSCLR_R_INT_OFFSET 16
45
46
47 #define SAMSUNG_KEYIFCOL_MASK (0xff << 0)
48 #define S5PV210_KEYIFCOLEN_MASK (0xff << 8)
49
50
51 #define SAMSUNG_KEYIFROW_MASK (0xff << 0)
52 #define S5PV210_KEYIFROW_MASK (0x3fff << 0)
53
54
55 #define SAMSUNG_KEYIFFC_MASK (0x3ff << 0)
56
57 enum samsung_keypad_type {
58 KEYPAD_TYPE_SAMSUNG,
59 KEYPAD_TYPE_S5PV210,
60 };
61
62 struct samsung_keypad {
63 struct input_dev *input_dev;
64 struct platform_device *pdev;
65 struct clk *clk;
66 void __iomem *base;
67 wait_queue_head_t wait;
68 bool stopped;
69 bool wake_enabled;
70 int irq;
71 enum samsung_keypad_type type;
72 unsigned int row_shift;
73 unsigned int rows;
74 unsigned int cols;
75 unsigned int row_state[SAMSUNG_MAX_COLS];
76 unsigned short keycodes[];
77 };
78
79 static void samsung_keypad_scan(struct samsung_keypad *keypad,
80 unsigned int *row_state)
81 {
82 unsigned int col;
83 unsigned int val;
84
85 for (col = 0; col < keypad->cols; col++) {
86 if (keypad->type == KEYPAD_TYPE_S5PV210) {
87 val = S5PV210_KEYIFCOLEN_MASK;
88 val &= ~(1 << col) << 8;
89 } else {
90 val = SAMSUNG_KEYIFCOL_MASK;
91 val &= ~(1 << col);
92 }
93
94 writel(val, keypad->base + SAMSUNG_KEYIFCOL);
95 mdelay(1);
96
97 val = readl(keypad->base + SAMSUNG_KEYIFROW);
98 row_state[col] = ~val & ((1 << keypad->rows) - 1);
99 }
100
101
102 writel(0, keypad->base + SAMSUNG_KEYIFCOL);
103 }
104
105 static bool samsung_keypad_report(struct samsung_keypad *keypad,
106 unsigned int *row_state)
107 {
108 struct input_dev *input_dev = keypad->input_dev;
109 unsigned int changed;
110 unsigned int pressed;
111 unsigned int key_down = 0;
112 unsigned int val;
113 unsigned int col, row;
114
115 for (col = 0; col < keypad->cols; col++) {
116 changed = row_state[col] ^ keypad->row_state[col];
117 key_down |= row_state[col];
118 if (!changed)
119 continue;
120
121 for (row = 0; row < keypad->rows; row++) {
122 if (!(changed & (1 << row)))
123 continue;
124
125 pressed = row_state[col] & (1 << row);
126
127 dev_dbg(&keypad->input_dev->dev,
128 "key %s, row: %d, col: %d\n",
129 pressed ? "pressed" : "released", row, col);
130
131 val = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
132
133 input_event(input_dev, EV_MSC, MSC_SCAN, val);
134 input_report_key(input_dev,
135 keypad->keycodes[val], pressed);
136 }
137 input_sync(keypad->input_dev);
138 }
139
140 memcpy(keypad->row_state, row_state, sizeof(keypad->row_state));
141
142 return key_down;
143 }
144
145 static irqreturn_t samsung_keypad_irq(int irq, void *dev_id)
146 {
147 struct samsung_keypad *keypad = dev_id;
148 unsigned int row_state[SAMSUNG_MAX_COLS];
149 unsigned int val;
150 bool key_down;
151
152 pm_runtime_get_sync(&keypad->pdev->dev);
153
154 do {
155 val = readl(keypad->base + SAMSUNG_KEYIFSTSCLR);
156
157 writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
158
159 samsung_keypad_scan(keypad, row_state);
160
161 key_down = samsung_keypad_report(keypad, row_state);
162 if (key_down)
163 wait_event_timeout(keypad->wait, keypad->stopped,
164 msecs_to_jiffies(50));
165
166 } while (key_down && !keypad->stopped);
167
168 pm_runtime_put(&keypad->pdev->dev);
169
170 return IRQ_HANDLED;
171 }
172
173 static void samsung_keypad_start(struct samsung_keypad *keypad)
174 {
175 unsigned int val;
176
177 pm_runtime_get_sync(&keypad->pdev->dev);
178
179
180 keypad->stopped = false;
181
182 clk_enable(keypad->clk);
183
184
185 val = readl(keypad->base + SAMSUNG_KEYIFCON);
186 val |= SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN;
187 writel(val, keypad->base + SAMSUNG_KEYIFCON);
188
189
190 writel(0, keypad->base + SAMSUNG_KEYIFCOL);
191
192 pm_runtime_put(&keypad->pdev->dev);
193 }
194
195 static void samsung_keypad_stop(struct samsung_keypad *keypad)
196 {
197 unsigned int val;
198
199 pm_runtime_get_sync(&keypad->pdev->dev);
200
201
202 keypad->stopped = true;
203 wake_up(&keypad->wait);
204 disable_irq(keypad->irq);
205
206
207 writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
208
209
210 val = readl(keypad->base + SAMSUNG_KEYIFCON);
211 val &= ~(SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN);
212 writel(val, keypad->base + SAMSUNG_KEYIFCON);
213
214 clk_disable(keypad->clk);
215
216
217
218
219
220 enable_irq(keypad->irq);
221
222 pm_runtime_put(&keypad->pdev->dev);
223 }
224
225 static int samsung_keypad_open(struct input_dev *input_dev)
226 {
227 struct samsung_keypad *keypad = input_get_drvdata(input_dev);
228
229 samsung_keypad_start(keypad);
230
231 return 0;
232 }
233
234 static void samsung_keypad_close(struct input_dev *input_dev)
235 {
236 struct samsung_keypad *keypad = input_get_drvdata(input_dev);
237
238 samsung_keypad_stop(keypad);
239 }
240
241 #ifdef CONFIG_OF
242 static struct samsung_keypad_platdata *
243 samsung_keypad_parse_dt(struct device *dev)
244 {
245 struct samsung_keypad_platdata *pdata;
246 struct matrix_keymap_data *keymap_data;
247 uint32_t *keymap, num_rows = 0, num_cols = 0;
248 struct device_node *np = dev->of_node, *key_np;
249 unsigned int key_count;
250
251 if (!np) {
252 dev_err(dev, "missing device tree data\n");
253 return ERR_PTR(-EINVAL);
254 }
255
256 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
257 if (!pdata) {
258 dev_err(dev, "could not allocate memory for platform data\n");
259 return ERR_PTR(-ENOMEM);
260 }
261
262 of_property_read_u32(np, "samsung,keypad-num-rows", &num_rows);
263 of_property_read_u32(np, "samsung,keypad-num-columns", &num_cols);
264 if (!num_rows || !num_cols) {
265 dev_err(dev, "number of keypad rows/columns not specified\n");
266 return ERR_PTR(-EINVAL);
267 }
268 pdata->rows = num_rows;
269 pdata->cols = num_cols;
270
271 keymap_data = devm_kzalloc(dev, sizeof(*keymap_data), GFP_KERNEL);
272 if (!keymap_data) {
273 dev_err(dev, "could not allocate memory for keymap data\n");
274 return ERR_PTR(-ENOMEM);
275 }
276 pdata->keymap_data = keymap_data;
277
278 key_count = of_get_child_count(np);
279 keymap_data->keymap_size = key_count;
280 keymap = devm_kcalloc(dev, key_count, sizeof(uint32_t), GFP_KERNEL);
281 if (!keymap) {
282 dev_err(dev, "could not allocate memory for keymap\n");
283 return ERR_PTR(-ENOMEM);
284 }
285 keymap_data->keymap = keymap;
286
287 for_each_child_of_node(np, key_np) {
288 u32 row, col, key_code;
289 of_property_read_u32(key_np, "keypad,row", &row);
290 of_property_read_u32(key_np, "keypad,column", &col);
291 of_property_read_u32(key_np, "linux,code", &key_code);
292 *keymap++ = KEY(row, col, key_code);
293 }
294
295 if (of_get_property(np, "linux,input-no-autorepeat", NULL))
296 pdata->no_autorepeat = true;
297
298 pdata->wakeup = of_property_read_bool(np, "wakeup-source") ||
299
300 of_property_read_bool(np, "linux,input-wakeup");
301
302
303 return pdata;
304 }
305 #else
306 static struct samsung_keypad_platdata *
307 samsung_keypad_parse_dt(struct device *dev)
308 {
309 dev_err(dev, "no platform data defined\n");
310
311 return ERR_PTR(-EINVAL);
312 }
313 #endif
314
315 static int samsung_keypad_probe(struct platform_device *pdev)
316 {
317 const struct samsung_keypad_platdata *pdata;
318 const struct matrix_keymap_data *keymap_data;
319 struct samsung_keypad *keypad;
320 struct resource *res;
321 struct input_dev *input_dev;
322 unsigned int row_shift;
323 unsigned int keymap_size;
324 int error;
325
326 pdata = dev_get_platdata(&pdev->dev);
327 if (!pdata) {
328 pdata = samsung_keypad_parse_dt(&pdev->dev);
329 if (IS_ERR(pdata))
330 return PTR_ERR(pdata);
331 }
332
333 keymap_data = pdata->keymap_data;
334 if (!keymap_data) {
335 dev_err(&pdev->dev, "no keymap data defined\n");
336 return -EINVAL;
337 }
338
339 if (!pdata->rows || pdata->rows > SAMSUNG_MAX_ROWS)
340 return -EINVAL;
341
342 if (!pdata->cols || pdata->cols > SAMSUNG_MAX_COLS)
343 return -EINVAL;
344
345
346 if (pdata->cfg_gpio)
347 pdata->cfg_gpio(pdata->rows, pdata->cols);
348
349 row_shift = get_count_order(pdata->cols);
350 keymap_size = (pdata->rows << row_shift) * sizeof(keypad->keycodes[0]);
351
352 keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad) + keymap_size,
353 GFP_KERNEL);
354 input_dev = devm_input_allocate_device(&pdev->dev);
355 if (!keypad || !input_dev)
356 return -ENOMEM;
357
358 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
359 if (!res)
360 return -ENODEV;
361
362 keypad->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
363 if (!keypad->base)
364 return -EBUSY;
365
366 keypad->clk = devm_clk_get(&pdev->dev, "keypad");
367 if (IS_ERR(keypad->clk)) {
368 dev_err(&pdev->dev, "failed to get keypad clk\n");
369 return PTR_ERR(keypad->clk);
370 }
371
372 error = clk_prepare(keypad->clk);
373 if (error) {
374 dev_err(&pdev->dev, "keypad clock prepare failed\n");
375 return error;
376 }
377
378 keypad->input_dev = input_dev;
379 keypad->pdev = pdev;
380 keypad->row_shift = row_shift;
381 keypad->rows = pdata->rows;
382 keypad->cols = pdata->cols;
383 keypad->stopped = true;
384 init_waitqueue_head(&keypad->wait);
385
386 if (pdev->dev.of_node)
387 keypad->type = of_device_is_compatible(pdev->dev.of_node,
388 "samsung,s5pv210-keypad");
389 else
390 keypad->type = platform_get_device_id(pdev)->driver_data;
391
392 input_dev->name = pdev->name;
393 input_dev->id.bustype = BUS_HOST;
394 input_dev->dev.parent = &pdev->dev;
395
396 input_dev->open = samsung_keypad_open;
397 input_dev->close = samsung_keypad_close;
398
399 error = matrix_keypad_build_keymap(keymap_data, NULL,
400 pdata->rows, pdata->cols,
401 keypad->keycodes, input_dev);
402 if (error) {
403 dev_err(&pdev->dev, "failed to build keymap\n");
404 goto err_unprepare_clk;
405 }
406
407 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
408 if (!pdata->no_autorepeat)
409 __set_bit(EV_REP, input_dev->evbit);
410
411 input_set_drvdata(input_dev, keypad);
412
413 keypad->irq = platform_get_irq(pdev, 0);
414 if (keypad->irq < 0) {
415 error = keypad->irq;
416 goto err_unprepare_clk;
417 }
418
419 error = devm_request_threaded_irq(&pdev->dev, keypad->irq, NULL,
420 samsung_keypad_irq, IRQF_ONESHOT,
421 dev_name(&pdev->dev), keypad);
422 if (error) {
423 dev_err(&pdev->dev, "failed to register keypad interrupt\n");
424 goto err_unprepare_clk;
425 }
426
427 device_init_wakeup(&pdev->dev, pdata->wakeup);
428 platform_set_drvdata(pdev, keypad);
429 pm_runtime_enable(&pdev->dev);
430
431 error = input_register_device(keypad->input_dev);
432 if (error)
433 goto err_disable_runtime_pm;
434
435 if (pdev->dev.of_node) {
436 devm_kfree(&pdev->dev, (void *)pdata->keymap_data->keymap);
437 devm_kfree(&pdev->dev, (void *)pdata->keymap_data);
438 devm_kfree(&pdev->dev, (void *)pdata);
439 }
440 return 0;
441
442 err_disable_runtime_pm:
443 pm_runtime_disable(&pdev->dev);
444 err_unprepare_clk:
445 clk_unprepare(keypad->clk);
446 return error;
447 }
448
449 static int samsung_keypad_remove(struct platform_device *pdev)
450 {
451 struct samsung_keypad *keypad = platform_get_drvdata(pdev);
452
453 pm_runtime_disable(&pdev->dev);
454
455 input_unregister_device(keypad->input_dev);
456
457 clk_unprepare(keypad->clk);
458
459 return 0;
460 }
461
462 #ifdef CONFIG_PM
463 static int samsung_keypad_runtime_suspend(struct device *dev)
464 {
465 struct platform_device *pdev = to_platform_device(dev);
466 struct samsung_keypad *keypad = platform_get_drvdata(pdev);
467 unsigned int val;
468 int error;
469
470 if (keypad->stopped)
471 return 0;
472
473
474 error = enable_irq_wake(keypad->irq);
475 if (!error)
476 keypad->wake_enabled = true;
477
478 val = readl(keypad->base + SAMSUNG_KEYIFCON);
479 val |= SAMSUNG_KEYIFCON_WAKEUPEN;
480 writel(val, keypad->base + SAMSUNG_KEYIFCON);
481
482 clk_disable(keypad->clk);
483
484 return 0;
485 }
486
487 static int samsung_keypad_runtime_resume(struct device *dev)
488 {
489 struct platform_device *pdev = to_platform_device(dev);
490 struct samsung_keypad *keypad = platform_get_drvdata(pdev);
491 unsigned int val;
492
493 if (keypad->stopped)
494 return 0;
495
496 clk_enable(keypad->clk);
497
498 val = readl(keypad->base + SAMSUNG_KEYIFCON);
499 val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
500 writel(val, keypad->base + SAMSUNG_KEYIFCON);
501
502 if (keypad->wake_enabled)
503 disable_irq_wake(keypad->irq);
504
505 return 0;
506 }
507 #endif
508
509 #ifdef CONFIG_PM_SLEEP
510 static void samsung_keypad_toggle_wakeup(struct samsung_keypad *keypad,
511 bool enable)
512 {
513 unsigned int val;
514
515 clk_enable(keypad->clk);
516
517 val = readl(keypad->base + SAMSUNG_KEYIFCON);
518 if (enable) {
519 val |= SAMSUNG_KEYIFCON_WAKEUPEN;
520 if (device_may_wakeup(&keypad->pdev->dev))
521 enable_irq_wake(keypad->irq);
522 } else {
523 val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
524 if (device_may_wakeup(&keypad->pdev->dev))
525 disable_irq_wake(keypad->irq);
526 }
527 writel(val, keypad->base + SAMSUNG_KEYIFCON);
528
529 clk_disable(keypad->clk);
530 }
531
532 static int samsung_keypad_suspend(struct device *dev)
533 {
534 struct platform_device *pdev = to_platform_device(dev);
535 struct samsung_keypad *keypad = platform_get_drvdata(pdev);
536 struct input_dev *input_dev = keypad->input_dev;
537
538 mutex_lock(&input_dev->mutex);
539
540 if (input_dev->users)
541 samsung_keypad_stop(keypad);
542
543 samsung_keypad_toggle_wakeup(keypad, true);
544
545 mutex_unlock(&input_dev->mutex);
546
547 return 0;
548 }
549
550 static int samsung_keypad_resume(struct device *dev)
551 {
552 struct platform_device *pdev = to_platform_device(dev);
553 struct samsung_keypad *keypad = platform_get_drvdata(pdev);
554 struct input_dev *input_dev = keypad->input_dev;
555
556 mutex_lock(&input_dev->mutex);
557
558 samsung_keypad_toggle_wakeup(keypad, false);
559
560 if (input_dev->users)
561 samsung_keypad_start(keypad);
562
563 mutex_unlock(&input_dev->mutex);
564
565 return 0;
566 }
567 #endif
568
569 static const struct dev_pm_ops samsung_keypad_pm_ops = {
570 SET_SYSTEM_SLEEP_PM_OPS(samsung_keypad_suspend, samsung_keypad_resume)
571 SET_RUNTIME_PM_OPS(samsung_keypad_runtime_suspend,
572 samsung_keypad_runtime_resume, NULL)
573 };
574
575 #ifdef CONFIG_OF
576 static const struct of_device_id samsung_keypad_dt_match[] = {
577 { .compatible = "samsung,s3c6410-keypad" },
578 { .compatible = "samsung,s5pv210-keypad" },
579 {},
580 };
581 MODULE_DEVICE_TABLE(of, samsung_keypad_dt_match);
582 #endif
583
584 static const struct platform_device_id samsung_keypad_driver_ids[] = {
585 {
586 .name = "samsung-keypad",
587 .driver_data = KEYPAD_TYPE_SAMSUNG,
588 }, {
589 .name = "s5pv210-keypad",
590 .driver_data = KEYPAD_TYPE_S5PV210,
591 },
592 { },
593 };
594 MODULE_DEVICE_TABLE(platform, samsung_keypad_driver_ids);
595
596 static struct platform_driver samsung_keypad_driver = {
597 .probe = samsung_keypad_probe,
598 .remove = samsung_keypad_remove,
599 .driver = {
600 .name = "samsung-keypad",
601 .of_match_table = of_match_ptr(samsung_keypad_dt_match),
602 .pm = &samsung_keypad_pm_ops,
603 },
604 .id_table = samsung_keypad_driver_ids,
605 };
606 module_platform_driver(samsung_keypad_driver);
607
608 MODULE_DESCRIPTION("Samsung keypad driver");
609 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
610 MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
611 MODULE_LICENSE("GPL");