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24#include <linux/module.h>
25#include <linux/init.h>
26#include <linux/interrupt.h>
27#include <linux/platform_device.h>
28#include <linux/errno.h>
29#include <linux/io.h>
30#include <linux/of.h>
31#include <linux/input.h>
32#include <linux/slab.h>
33#include <linux/pm_runtime.h>
34
35#include <linux/platform_data/omap4-keypad.h>
36
37
38#define OMAP4_KBD_REVISION 0x00
39#define OMAP4_KBD_SYSCONFIG 0x10
40#define OMAP4_KBD_SYSSTATUS 0x14
41#define OMAP4_KBD_IRQSTATUS 0x18
42#define OMAP4_KBD_IRQENABLE 0x1C
43#define OMAP4_KBD_WAKEUPENABLE 0x20
44#define OMAP4_KBD_PENDING 0x24
45#define OMAP4_KBD_CTRL 0x28
46#define OMAP4_KBD_DEBOUNCINGTIME 0x2C
47#define OMAP4_KBD_LONGKEYTIME 0x30
48#define OMAP4_KBD_TIMEOUT 0x34
49#define OMAP4_KBD_STATEMACHINE 0x38
50#define OMAP4_KBD_ROWINPUTS 0x3C
51#define OMAP4_KBD_COLUMNOUTPUTS 0x40
52#define OMAP4_KBD_FULLCODE31_0 0x44
53#define OMAP4_KBD_FULLCODE63_32 0x48
54
55
56#define OMAP4_DEF_IRQENABLE_EVENTEN BIT(0)
57#define OMAP4_DEF_IRQENABLE_LONGKEY BIT(1)
58#define OMAP4_DEF_WUP_EVENT_ENA BIT(0)
59#define OMAP4_DEF_WUP_LONG_KEY_ENA BIT(1)
60#define OMAP4_DEF_CTRL_NOSOFTMODE BIT(1)
61#define OMAP4_DEF_CTRL_PTV_SHIFT 2
62
63
64#define OMAP4_VAL_IRQDISABLE 0x0
65#define OMAP4_VAL_DEBOUNCINGTIME 0x7
66#define OMAP4_VAL_PVT 0x7
67
68enum {
69 KBD_REVISION_OMAP4 = 0,
70 KBD_REVISION_OMAP5,
71};
72
73struct omap4_keypad {
74 struct input_dev *input;
75
76 void __iomem *base;
77 bool irq_wake_enabled;
78 unsigned int irq;
79
80 unsigned int rows;
81 unsigned int cols;
82 u32 reg_offset;
83 u32 irqreg_offset;
84 unsigned int row_shift;
85 bool no_autorepeat;
86 unsigned char key_state[8];
87 unsigned short *keymap;
88};
89
90static int kbd_readl(struct omap4_keypad *keypad_data, u32 offset)
91{
92 return __raw_readl(keypad_data->base +
93 keypad_data->reg_offset + offset);
94}
95
96static void kbd_writel(struct omap4_keypad *keypad_data, u32 offset, u32 value)
97{
98 __raw_writel(value,
99 keypad_data->base + keypad_data->reg_offset + offset);
100}
101
102static int kbd_read_irqreg(struct omap4_keypad *keypad_data, u32 offset)
103{
104 return __raw_readl(keypad_data->base +
105 keypad_data->irqreg_offset + offset);
106}
107
108static void kbd_write_irqreg(struct omap4_keypad *keypad_data,
109 u32 offset, u32 value)
110{
111 __raw_writel(value,
112 keypad_data->base + keypad_data->irqreg_offset + offset);
113}
114
115
116
117static irqreturn_t omap4_keypad_irq_handler(int irq, void *dev_id)
118{
119 struct omap4_keypad *keypad_data = dev_id;
120
121 if (kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS)) {
122
123 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
124 OMAP4_VAL_IRQDISABLE);
125 return IRQ_WAKE_THREAD;
126 }
127
128 return IRQ_NONE;
129}
130
131static irqreturn_t omap4_keypad_irq_thread_fn(int irq, void *dev_id)
132{
133 struct omap4_keypad *keypad_data = dev_id;
134 struct input_dev *input_dev = keypad_data->input;
135 unsigned char key_state[ARRAY_SIZE(keypad_data->key_state)];
136 unsigned int col, row, code, changed;
137 u32 *new_state = (u32 *) key_state;
138
139 *new_state = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0);
140 *(new_state + 1) = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32);
141
142 for (row = 0; row < keypad_data->rows; row++) {
143 changed = key_state[row] ^ keypad_data->key_state[row];
144 if (!changed)
145 continue;
146
147 for (col = 0; col < keypad_data->cols; col++) {
148 if (changed & (1 << col)) {
149 code = MATRIX_SCAN_CODE(row, col,
150 keypad_data->row_shift);
151 input_event(input_dev, EV_MSC, MSC_SCAN, code);
152 input_report_key(input_dev,
153 keypad_data->keymap[code],
154 key_state[row] & (1 << col));
155 }
156 }
157 }
158
159 input_sync(input_dev);
160
161 memcpy(keypad_data->key_state, key_state,
162 sizeof(keypad_data->key_state));
163
164
165 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
166 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
167
168
169 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
170 OMAP4_DEF_IRQENABLE_EVENTEN |
171 OMAP4_DEF_IRQENABLE_LONGKEY);
172
173 return IRQ_HANDLED;
174}
175
176static int omap4_keypad_open(struct input_dev *input)
177{
178 struct omap4_keypad *keypad_data = input_get_drvdata(input);
179
180 pm_runtime_get_sync(input->dev.parent);
181
182 disable_irq(keypad_data->irq);
183
184 kbd_writel(keypad_data, OMAP4_KBD_CTRL,
185 OMAP4_DEF_CTRL_NOSOFTMODE |
186 (OMAP4_VAL_PVT << OMAP4_DEF_CTRL_PTV_SHIFT));
187 kbd_writel(keypad_data, OMAP4_KBD_DEBOUNCINGTIME,
188 OMAP4_VAL_DEBOUNCINGTIME);
189
190 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
191 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
192 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
193 OMAP4_DEF_IRQENABLE_EVENTEN |
194 OMAP4_DEF_IRQENABLE_LONGKEY);
195 kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE,
196 OMAP4_DEF_WUP_EVENT_ENA | OMAP4_DEF_WUP_LONG_KEY_ENA);
197
198 enable_irq(keypad_data->irq);
199
200 return 0;
201}
202
203static void omap4_keypad_close(struct input_dev *input)
204{
205 struct omap4_keypad *keypad_data = input_get_drvdata(input);
206
207 disable_irq(keypad_data->irq);
208
209
210 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
211 OMAP4_VAL_IRQDISABLE);
212
213
214 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
215 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
216
217 enable_irq(keypad_data->irq);
218
219 pm_runtime_put_sync(input->dev.parent);
220}
221
222#ifdef CONFIG_OF
223static int omap4_keypad_parse_dt(struct device *dev,
224 struct omap4_keypad *keypad_data)
225{
226 struct device_node *np = dev->of_node;
227 int err;
228
229 err = matrix_keypad_parse_of_params(dev, &keypad_data->rows,
230 &keypad_data->cols);
231 if (err)
232 return err;
233
234 if (of_get_property(np, "linux,input-no-autorepeat", NULL))
235 keypad_data->no_autorepeat = true;
236
237 return 0;
238}
239#else
240static inline int omap4_keypad_parse_dt(struct device *dev,
241 struct omap4_keypad *keypad_data)
242{
243 return -ENOSYS;
244}
245#endif
246
247static int omap4_keypad_probe(struct platform_device *pdev)
248{
249 const struct omap4_keypad_platform_data *pdata =
250 dev_get_platdata(&pdev->dev);
251 const struct matrix_keymap_data *keymap_data =
252 pdata ? pdata->keymap_data : NULL;
253 struct omap4_keypad *keypad_data;
254 struct input_dev *input_dev;
255 struct resource *res;
256 unsigned int max_keys;
257 int rev;
258 int irq;
259 int error;
260
261 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
262 if (!res) {
263 dev_err(&pdev->dev, "no base address specified\n");
264 return -EINVAL;
265 }
266
267 irq = platform_get_irq(pdev, 0);
268 if (!irq) {
269 dev_err(&pdev->dev, "no keyboard irq assigned\n");
270 return -EINVAL;
271 }
272
273 keypad_data = kzalloc(sizeof(struct omap4_keypad), GFP_KERNEL);
274 if (!keypad_data) {
275 dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
276 return -ENOMEM;
277 }
278
279 keypad_data->irq = irq;
280
281 if (pdata) {
282 keypad_data->rows = pdata->rows;
283 keypad_data->cols = pdata->cols;
284 } else {
285 error = omap4_keypad_parse_dt(&pdev->dev, keypad_data);
286 if (error)
287 return error;
288 }
289
290 res = request_mem_region(res->start, resource_size(res), pdev->name);
291 if (!res) {
292 dev_err(&pdev->dev, "can't request mem region\n");
293 error = -EBUSY;
294 goto err_free_keypad;
295 }
296
297 keypad_data->base = ioremap(res->start, resource_size(res));
298 if (!keypad_data->base) {
299 dev_err(&pdev->dev, "can't ioremap mem resource\n");
300 error = -ENOMEM;
301 goto err_release_mem;
302 }
303
304
305
306
307
308
309 pm_runtime_enable(&pdev->dev);
310 error = pm_runtime_get_sync(&pdev->dev);
311 if (error) {
312 dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
313 goto err_unmap;
314 }
315 rev = __raw_readl(keypad_data->base + OMAP4_KBD_REVISION);
316 rev &= 0x03 << 30;
317 rev >>= 30;
318 switch (rev) {
319 case KBD_REVISION_OMAP4:
320 keypad_data->reg_offset = 0x00;
321 keypad_data->irqreg_offset = 0x00;
322 break;
323 case KBD_REVISION_OMAP5:
324 keypad_data->reg_offset = 0x10;
325 keypad_data->irqreg_offset = 0x0c;
326 break;
327 default:
328 dev_err(&pdev->dev,
329 "Keypad reports unsupported revision %d", rev);
330 error = -EINVAL;
331 goto err_pm_put_sync;
332 }
333
334
335 keypad_data->input = input_dev = input_allocate_device();
336 if (!input_dev) {
337 error = -ENOMEM;
338 goto err_pm_put_sync;
339 }
340
341 input_dev->name = pdev->name;
342 input_dev->dev.parent = &pdev->dev;
343 input_dev->id.bustype = BUS_HOST;
344 input_dev->id.vendor = 0x0001;
345 input_dev->id.product = 0x0001;
346 input_dev->id.version = 0x0001;
347
348 input_dev->open = omap4_keypad_open;
349 input_dev->close = omap4_keypad_close;
350
351 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
352 if (!keypad_data->no_autorepeat)
353 __set_bit(EV_REP, input_dev->evbit);
354
355 input_set_drvdata(input_dev, keypad_data);
356
357 keypad_data->row_shift = get_count_order(keypad_data->cols);
358 max_keys = keypad_data->rows << keypad_data->row_shift;
359 keypad_data->keymap = kzalloc(max_keys * sizeof(keypad_data->keymap[0]),
360 GFP_KERNEL);
361 if (!keypad_data->keymap) {
362 dev_err(&pdev->dev, "Not enough memory for keymap\n");
363 error = -ENOMEM;
364 goto err_free_input;
365 }
366
367 error = matrix_keypad_build_keymap(keymap_data, NULL,
368 keypad_data->rows, keypad_data->cols,
369 keypad_data->keymap, input_dev);
370 if (error) {
371 dev_err(&pdev->dev, "failed to build keymap\n");
372 goto err_free_keymap;
373 }
374
375 error = request_threaded_irq(keypad_data->irq, omap4_keypad_irq_handler,
376 omap4_keypad_irq_thread_fn, 0,
377 "omap4-keypad", keypad_data);
378 if (error) {
379 dev_err(&pdev->dev, "failed to register interrupt\n");
380 goto err_free_input;
381 }
382
383 device_init_wakeup(&pdev->dev, true);
384 pm_runtime_put_sync(&pdev->dev);
385
386 error = input_register_device(keypad_data->input);
387 if (error < 0) {
388 dev_err(&pdev->dev, "failed to register input device\n");
389 goto err_pm_disable;
390 }
391
392 platform_set_drvdata(pdev, keypad_data);
393 return 0;
394
395err_pm_disable:
396 pm_runtime_disable(&pdev->dev);
397 device_init_wakeup(&pdev->dev, false);
398 free_irq(keypad_data->irq, keypad_data);
399err_free_keymap:
400 kfree(keypad_data->keymap);
401err_free_input:
402 input_free_device(input_dev);
403err_pm_put_sync:
404 pm_runtime_put_sync(&pdev->dev);
405err_unmap:
406 iounmap(keypad_data->base);
407err_release_mem:
408 release_mem_region(res->start, resource_size(res));
409err_free_keypad:
410 kfree(keypad_data);
411 return error;
412}
413
414static int omap4_keypad_remove(struct platform_device *pdev)
415{
416 struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
417 struct resource *res;
418
419 free_irq(keypad_data->irq, keypad_data);
420
421 pm_runtime_disable(&pdev->dev);
422
423 device_init_wakeup(&pdev->dev, false);
424
425 input_unregister_device(keypad_data->input);
426
427 iounmap(keypad_data->base);
428
429 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
430 release_mem_region(res->start, resource_size(res));
431
432 kfree(keypad_data->keymap);
433 kfree(keypad_data);
434
435 return 0;
436}
437
438#ifdef CONFIG_OF
439static const struct of_device_id omap_keypad_dt_match[] = {
440 { .compatible = "ti,omap4-keypad" },
441 {},
442};
443MODULE_DEVICE_TABLE(of, omap_keypad_dt_match);
444#endif
445
446#ifdef CONFIG_PM_SLEEP
447static int omap4_keypad_suspend(struct device *dev)
448{
449 struct platform_device *pdev = to_platform_device(dev);
450 struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
451 int error;
452
453 if (device_may_wakeup(&pdev->dev)) {
454 error = enable_irq_wake(keypad_data->irq);
455 if (!error)
456 keypad_data->irq_wake_enabled = true;
457 }
458
459 return 0;
460}
461
462static int omap4_keypad_resume(struct device *dev)
463{
464 struct platform_device *pdev = to_platform_device(dev);
465 struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
466
467 if (device_may_wakeup(&pdev->dev) && keypad_data->irq_wake_enabled) {
468 disable_irq_wake(keypad_data->irq);
469 keypad_data->irq_wake_enabled = false;
470 }
471
472 return 0;
473}
474#endif
475
476static SIMPLE_DEV_PM_OPS(omap4_keypad_pm_ops,
477 omap4_keypad_suspend, omap4_keypad_resume);
478
479static struct platform_driver omap4_keypad_driver = {
480 .probe = omap4_keypad_probe,
481 .remove = omap4_keypad_remove,
482 .driver = {
483 .name = "omap4-keypad",
484 .owner = THIS_MODULE,
485 .pm = &omap4_keypad_pm_ops,
486 .of_match_table = of_match_ptr(omap_keypad_dt_match),
487 },
488};
489module_platform_driver(omap4_keypad_driver);
490
491MODULE_AUTHOR("Texas Instruments");
492MODULE_DESCRIPTION("OMAP4 Keypad Driver");
493MODULE_LICENSE("GPL");
494MODULE_ALIAS("platform:omap4-keypad");
495
