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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 (1 << 0)
57#define OMAP4_DEF_IRQENABLE_LONGKEY (1 << 1)
58#define OMAP4_DEF_IRQENABLE_TIMEOUTEN (1 << 2)
59#define OMAP4_DEF_WUP_EVENT_ENA (1 << 0)
60#define OMAP4_DEF_WUP_LONG_KEY_ENA (1 << 1)
61#define OMAP4_DEF_CTRL_NOSOFTMODE (1 << 1)
62#define OMAP4_DEF_CTRLPTVVALUE (1 << 2)
63#define OMAP4_DEF_CTRLPTV (1 << 1)
64
65
66#define OMAP4_VAL_IRQDISABLE 0x00
67#define OMAP4_VAL_DEBOUNCINGTIME 0x07
68#define OMAP4_VAL_FUNCTIONALCFG 0x1E
69
70#define OMAP4_MASK_IRQSTATUSDISABLE 0xFFFF
71
72enum {
73 KBD_REVISION_OMAP4 = 0,
74 KBD_REVISION_OMAP5,
75};
76
77struct omap4_keypad {
78 struct input_dev *input;
79
80 void __iomem *base;
81 unsigned int irq;
82
83 unsigned int rows;
84 unsigned int cols;
85 u32 reg_offset;
86 u32 irqreg_offset;
87 unsigned int row_shift;
88 bool no_autorepeat;
89 unsigned char key_state[8];
90 unsigned short *keymap;
91};
92
93static int kbd_readl(struct omap4_keypad *keypad_data, u32 offset)
94{
95 return __raw_readl(keypad_data->base +
96 keypad_data->reg_offset + offset);
97}
98
99static void kbd_writel(struct omap4_keypad *keypad_data, u32 offset, u32 value)
100{
101 __raw_writel(value,
102 keypad_data->base + keypad_data->reg_offset + offset);
103}
104
105static int kbd_read_irqreg(struct omap4_keypad *keypad_data, u32 offset)
106{
107 return __raw_readl(keypad_data->base +
108 keypad_data->irqreg_offset + offset);
109}
110
111static void kbd_write_irqreg(struct omap4_keypad *keypad_data,
112 u32 offset, u32 value)
113{
114 __raw_writel(value,
115 keypad_data->base + keypad_data->irqreg_offset + offset);
116}
117
118
119
120static irqreturn_t omap4_keypad_interrupt(int irq, void *dev_id)
121{
122 struct omap4_keypad *keypad_data = dev_id;
123 struct input_dev *input_dev = keypad_data->input;
124 unsigned char key_state[ARRAY_SIZE(keypad_data->key_state)];
125 unsigned int col, row, code, changed;
126 u32 *new_state = (u32 *) key_state;
127
128
129 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
130 OMAP4_VAL_IRQDISABLE);
131
132 *new_state = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0);
133 *(new_state + 1) = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32);
134
135 for (row = 0; row < keypad_data->rows; row++) {
136 changed = key_state[row] ^ keypad_data->key_state[row];
137 if (!changed)
138 continue;
139
140 for (col = 0; col < keypad_data->cols; col++) {
141 if (changed & (1 << col)) {
142 code = MATRIX_SCAN_CODE(row, col,
143 keypad_data->row_shift);
144 input_event(input_dev, EV_MSC, MSC_SCAN, code);
145 input_report_key(input_dev,
146 keypad_data->keymap[code],
147 key_state[row] & (1 << col));
148 }
149 }
150 }
151
152 input_sync(input_dev);
153
154 memcpy(keypad_data->key_state, key_state,
155 sizeof(keypad_data->key_state));
156
157
158 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
159 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
160
161
162 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
163 OMAP4_DEF_IRQENABLE_EVENTEN |
164 OMAP4_DEF_IRQENABLE_LONGKEY);
165
166 return IRQ_HANDLED;
167}
168
169static int omap4_keypad_open(struct input_dev *input)
170{
171 struct omap4_keypad *keypad_data = input_get_drvdata(input);
172
173 pm_runtime_get_sync(input->dev.parent);
174
175 disable_irq(keypad_data->irq);
176
177 kbd_writel(keypad_data, OMAP4_KBD_CTRL,
178 OMAP4_VAL_FUNCTIONALCFG);
179 kbd_writel(keypad_data, OMAP4_KBD_DEBOUNCINGTIME,
180 OMAP4_VAL_DEBOUNCINGTIME);
181 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
182 OMAP4_VAL_IRQDISABLE);
183 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
184 OMAP4_DEF_IRQENABLE_EVENTEN |
185 OMAP4_DEF_IRQENABLE_LONGKEY);
186 kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE,
187 OMAP4_DEF_WUP_EVENT_ENA | OMAP4_DEF_WUP_LONG_KEY_ENA);
188
189 enable_irq(keypad_data->irq);
190
191 return 0;
192}
193
194static void omap4_keypad_close(struct input_dev *input)
195{
196 struct omap4_keypad *keypad_data = input_get_drvdata(input);
197
198 disable_irq(keypad_data->irq);
199
200
201 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
202 OMAP4_VAL_IRQDISABLE);
203
204
205 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
206 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
207
208 enable_irq(keypad_data->irq);
209
210 pm_runtime_put_sync(input->dev.parent);
211}
212
213#ifdef CONFIG_OF
214static int omap4_keypad_parse_dt(struct device *dev,
215 struct omap4_keypad *keypad_data)
216{
217 struct device_node *np = dev->of_node;
218 int err;
219
220 err = matrix_keypad_parse_of_params(dev, &keypad_data->rows,
221 &keypad_data->cols);
222 if (err)
223 return err;
224
225 if (of_get_property(np, "linux,input-no-autorepeat", NULL))
226 keypad_data->no_autorepeat = true;
227
228 return 0;
229}
230#else
231static inline int omap4_keypad_parse_dt(struct device *dev,
232 struct omap4_keypad *keypad_data)
233{
234 return -ENOSYS;
235}
236#endif
237
238static int omap4_keypad_probe(struct platform_device *pdev)
239{
240 const struct omap4_keypad_platform_data *pdata =
241 dev_get_platdata(&pdev->dev);
242 const struct matrix_keymap_data *keymap_data =
243 pdata ? pdata->keymap_data : NULL;
244 struct omap4_keypad *keypad_data;
245 struct input_dev *input_dev;
246 struct resource *res;
247 unsigned int max_keys;
248 int rev;
249 int irq;
250 int error;
251
252 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
253 if (!res) {
254 dev_err(&pdev->dev, "no base address specified\n");
255 return -EINVAL;
256 }
257
258 irq = platform_get_irq(pdev, 0);
259 if (!irq) {
260 dev_err(&pdev->dev, "no keyboard irq assigned\n");
261 return -EINVAL;
262 }
263
264 keypad_data = kzalloc(sizeof(struct omap4_keypad), GFP_KERNEL);
265 if (!keypad_data) {
266 dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
267 return -ENOMEM;
268 }
269
270 keypad_data->irq = irq;
271
272 if (pdata) {
273 keypad_data->rows = pdata->rows;
274 keypad_data->cols = pdata->cols;
275 } else {
276 error = omap4_keypad_parse_dt(&pdev->dev, keypad_data);
277 if (error)
278 return error;
279 }
280
281 res = request_mem_region(res->start, resource_size(res), pdev->name);
282 if (!res) {
283 dev_err(&pdev->dev, "can't request mem region\n");
284 error = -EBUSY;
285 goto err_free_keypad;
286 }
287
288 keypad_data->base = ioremap(res->start, resource_size(res));
289 if (!keypad_data->base) {
290 dev_err(&pdev->dev, "can't ioremap mem resource\n");
291 error = -ENOMEM;
292 goto err_release_mem;
293 }
294
295
296
297
298
299
300 pm_runtime_enable(&pdev->dev);
301 error = pm_runtime_get_sync(&pdev->dev);
302 if (error) {
303 dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
304 goto err_unmap;
305 }
306 rev = __raw_readl(keypad_data->base + OMAP4_KBD_REVISION);
307 rev &= 0x03 << 30;
308 rev >>= 30;
309 switch (rev) {
310 case KBD_REVISION_OMAP4:
311 keypad_data->reg_offset = 0x00;
312 keypad_data->irqreg_offset = 0x00;
313 break;
314 case KBD_REVISION_OMAP5:
315 keypad_data->reg_offset = 0x10;
316 keypad_data->irqreg_offset = 0x0c;
317 break;
318 default:
319 dev_err(&pdev->dev,
320 "Keypad reports unsupported revision %d", rev);
321 error = -EINVAL;
322 goto err_pm_put_sync;
323 }
324
325
326 keypad_data->input = input_dev = input_allocate_device();
327 if (!input_dev) {
328 error = -ENOMEM;
329 goto err_pm_put_sync;
330 }
331
332 input_dev->name = pdev->name;
333 input_dev->dev.parent = &pdev->dev;
334 input_dev->id.bustype = BUS_HOST;
335 input_dev->id.vendor = 0x0001;
336 input_dev->id.product = 0x0001;
337 input_dev->id.version = 0x0001;
338
339 input_dev->open = omap4_keypad_open;
340 input_dev->close = omap4_keypad_close;
341
342 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
343 if (!keypad_data->no_autorepeat)
344 __set_bit(EV_REP, input_dev->evbit);
345
346 input_set_drvdata(input_dev, keypad_data);
347
348 keypad_data->row_shift = get_count_order(keypad_data->cols);
349 max_keys = keypad_data->rows << keypad_data->row_shift;
350 keypad_data->keymap = kzalloc(max_keys * sizeof(keypad_data->keymap[0]),
351 GFP_KERNEL);
352 if (!keypad_data->keymap) {
353 dev_err(&pdev->dev, "Not enough memory for keymap\n");
354 error = -ENOMEM;
355 goto err_free_input;
356 }
357
358 error = matrix_keypad_build_keymap(keymap_data, NULL,
359 keypad_data->rows, keypad_data->cols,
360 keypad_data->keymap, input_dev);
361 if (error) {
362 dev_err(&pdev->dev, "failed to build keymap\n");
363 goto err_free_keymap;
364 }
365
366 error = request_irq(keypad_data->irq, omap4_keypad_interrupt,
367 IRQF_TRIGGER_RISING,
368 "omap4-keypad", keypad_data);
369 if (error) {
370 dev_err(&pdev->dev, "failed to register interrupt\n");
371 goto err_free_input;
372 }
373
374 pm_runtime_put_sync(&pdev->dev);
375
376 error = input_register_device(keypad_data->input);
377 if (error < 0) {
378 dev_err(&pdev->dev, "failed to register input device\n");
379 goto err_pm_disable;
380 }
381
382 platform_set_drvdata(pdev, keypad_data);
383 return 0;
384
385err_pm_disable:
386 pm_runtime_disable(&pdev->dev);
387 free_irq(keypad_data->irq, keypad_data);
388err_free_keymap:
389 kfree(keypad_data->keymap);
390err_free_input:
391 input_free_device(input_dev);
392err_pm_put_sync:
393 pm_runtime_put_sync(&pdev->dev);
394err_unmap:
395 iounmap(keypad_data->base);
396err_release_mem:
397 release_mem_region(res->start, resource_size(res));
398err_free_keypad:
399 kfree(keypad_data);
400 return error;
401}
402
403static int omap4_keypad_remove(struct platform_device *pdev)
404{
405 struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
406 struct resource *res;
407
408 free_irq(keypad_data->irq, keypad_data);
409
410 pm_runtime_disable(&pdev->dev);
411
412 input_unregister_device(keypad_data->input);
413
414 iounmap(keypad_data->base);
415
416 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
417 release_mem_region(res->start, resource_size(res));
418
419 kfree(keypad_data->keymap);
420 kfree(keypad_data);
421
422 platform_set_drvdata(pdev, NULL);
423
424 return 0;
425}
426
427#ifdef CONFIG_OF
428static const struct of_device_id omap_keypad_dt_match[] = {
429 { .compatible = "ti,omap4-keypad" },
430 {},
431};
432MODULE_DEVICE_TABLE(of, omap_keypad_dt_match);
433#endif
434
435static struct platform_driver omap4_keypad_driver = {
436 .probe = omap4_keypad_probe,
437 .remove = omap4_keypad_remove,
438 .driver = {
439 .name = "omap4-keypad",
440 .owner = THIS_MODULE,
441 .of_match_table = of_match_ptr(omap_keypad_dt_match),
442 },
443};
444module_platform_driver(omap4_keypad_driver);
445
446MODULE_AUTHOR("Texas Instruments");
447MODULE_DESCRIPTION("OMAP4 Keypad Driver");
448MODULE_LICENSE("GPL");
449MODULE_ALIAS("platform:omap4-keypad");
450
