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27#include <linux/module.h>
28#include <linux/init.h>
29#include <linux/interrupt.h>
30#include <linux/types.h>
31#include <linux/input.h>
32#include <linux/kernel.h>
33#include <linux/delay.h>
34#include <linux/platform_device.h>
35#include <linux/mutex.h>
36#include <linux/errno.h>
37#include <asm/arch/gpio.h>
38#include <asm/arch/keypad.h>
39#include <asm/arch/menelaus.h>
40#include <asm/irq.h>
41#include <asm/hardware.h>
42#include <asm/io.h>
43#include <asm/mach-types.h>
44#include <asm/arch/mux.h>
45
46#undef NEW_BOARD_LEARNING_MODE
47
48static void omap_kp_tasklet(unsigned long);
49static void omap_kp_timer(unsigned long);
50
51static unsigned char keypad_state[8];
52static DEFINE_MUTEX(kp_enable_mutex);
53static int kp_enable = 1;
54static int kp_cur_group = -1;
55
56struct omap_kp {
57 struct input_dev *input;
58 struct timer_list timer;
59 int irq;
60 unsigned int rows;
61 unsigned int cols;
62 unsigned long delay;
63 unsigned int debounce;
64};
65
66DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0);
67
68static int *keymap;
69static unsigned int *row_gpios;
70static unsigned int *col_gpios;
71
72#ifdef CONFIG_ARCH_OMAP2
73static void set_col_gpio_val(struct omap_kp *omap_kp, u8 value)
74{
75 int col;
76 for (col = 0; col < omap_kp->cols; col++) {
77 if (value & (1 << col))
78 omap_set_gpio_dataout(col_gpios[col], 1);
79 else
80 omap_set_gpio_dataout(col_gpios[col], 0);
81 }
82}
83
84static u8 get_row_gpio_val(struct omap_kp *omap_kp)
85{
86 int row;
87 u8 value = 0;
88
89 for (row = 0; row < omap_kp->rows; row++) {
90 if (omap_get_gpio_datain(row_gpios[row]))
91 value |= (1 << row);
92 }
93 return value;
94}
95#else
96#define set_col_gpio_val(x, y) do {} while (0)
97#define get_row_gpio_val(x) 0
98#endif
99
100static irqreturn_t omap_kp_interrupt(int irq, void *dev_id)
101{
102 struct omap_kp *omap_kp = dev_id;
103
104
105 if (cpu_is_omap24xx()) {
106 int i;
107 for (i = 0; i < omap_kp->rows; i++)
108 disable_irq(OMAP_GPIO_IRQ(row_gpios[i]));
109 } else
110
111 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
112
113 tasklet_schedule(&kp_tasklet);
114
115 return IRQ_HANDLED;
116}
117
118static void omap_kp_timer(unsigned long data)
119{
120 tasklet_schedule(&kp_tasklet);
121}
122
123static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state)
124{
125 int col = 0;
126
127
128 if (cpu_is_omap24xx()) {
129 int i;
130 for (i = 0; i < omap_kp->rows; i++)
131 disable_irq(OMAP_GPIO_IRQ(row_gpios[i]));
132
133
134 for (col = 0; col < omap_kp->cols; col++) {
135 set_col_gpio_val(omap_kp, ~(1 << col));
136 state[col] = ~(get_row_gpio_val(omap_kp)) & 0x3f;
137 }
138 set_col_gpio_val(omap_kp, 0);
139
140 } else {
141
142 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
143
144
145 omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
146 for (col = 0; col < omap_kp->cols; col++) {
147 omap_writew(~(1 << col) & 0xff,
148 OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
149
150 udelay(omap_kp->delay);
151
152 state[col] = ~omap_readw(OMAP_MPUIO_BASE +
153 OMAP_MPUIO_KBR_LATCH) & 0xff;
154 }
155 omap_writew(0x00, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
156 udelay(2);
157 }
158}
159
160static inline int omap_kp_find_key(int col, int row)
161{
162 int i, key;
163
164 key = KEY(col, row, 0);
165 for (i = 0; keymap[i] != 0; i++)
166 if ((keymap[i] & 0xff000000) == key)
167 return keymap[i] & 0x00ffffff;
168 return -1;
169}
170
171static void omap_kp_tasklet(unsigned long data)
172{
173 struct omap_kp *omap_kp_data = (struct omap_kp *) data;
174 unsigned char new_state[8], changed, key_down = 0;
175 int col, row;
176 int spurious = 0;
177
178
179 omap_kp_scan_keypad(omap_kp_data, new_state);
180
181
182 for (col = 0; col < omap_kp_data->cols; col++) {
183 changed = new_state[col] ^ keypad_state[col];
184 key_down |= new_state[col];
185 if (changed == 0)
186 continue;
187
188 for (row = 0; row < omap_kp_data->rows; row++) {
189 int key;
190 if (!(changed & (1 << row)))
191 continue;
192#ifdef NEW_BOARD_LEARNING_MODE
193 printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col,
194 row, (new_state[col] & (1 << row)) ?
195 "pressed" : "released");
196#else
197 key = omap_kp_find_key(col, row);
198 if (key < 0) {
199 printk(KERN_WARNING
200 "omap-keypad: Spurious key event %d-%d\n",
201 col, row);
202
203 spurious = 1;
204 continue;
205 }
206
207 if (!(kp_cur_group == (key & GROUP_MASK) ||
208 kp_cur_group == -1))
209 continue;
210
211 kp_cur_group = key & GROUP_MASK;
212 input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
213 new_state[col] & (1 << row));
214#endif
215 }
216 }
217 memcpy(keypad_state, new_state, sizeof(keypad_state));
218
219 if (key_down) {
220 int delay = HZ / 20;
221
222
223 if (spurious)
224 delay = 2 * HZ;
225 mod_timer(&omap_kp_data->timer, jiffies + delay);
226 } else {
227
228 if (cpu_is_omap24xx()) {
229 int i;
230 for (i = 0; i < omap_kp_data->rows; i++)
231 enable_irq(OMAP_GPIO_IRQ(row_gpios[i]));
232 } else {
233 omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
234 kp_cur_group = -1;
235 }
236 }
237}
238
239static ssize_t omap_kp_enable_show(struct device *dev,
240 struct device_attribute *attr, char *buf)
241{
242 return sprintf(buf, "%u\n", kp_enable);
243}
244
245static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,
246 const char *buf, size_t count)
247{
248 int state;
249
250 if (sscanf(buf, "%u", &state) != 1)
251 return -EINVAL;
252
253 if ((state != 1) && (state != 0))
254 return -EINVAL;
255
256 mutex_lock(&kp_enable_mutex);
257 if (state != kp_enable) {
258 if (state)
259 enable_irq(INT_KEYBOARD);
260 else
261 disable_irq(INT_KEYBOARD);
262 kp_enable = state;
263 }
264 mutex_unlock(&kp_enable_mutex);
265
266 return strnlen(buf, count);
267}
268
269static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);
270
271#ifdef CONFIG_PM
272static int omap_kp_suspend(struct platform_device *dev, pm_message_t state)
273{
274
275
276 return 0;
277}
278
279static int omap_kp_resume(struct platform_device *dev)
280{
281
282
283 return 0;
284}
285#else
286#define omap_kp_suspend NULL
287#define omap_kp_resume NULL
288#endif
289
290static int __init omap_kp_probe(struct platform_device *pdev)
291{
292 struct omap_kp *omap_kp;
293 struct input_dev *input_dev;
294 struct omap_kp_platform_data *pdata = pdev->dev.platform_data;
295 int i, col_idx, row_idx, irq_idx, ret;
296
297 if (!pdata->rows || !pdata->cols || !pdata->keymap) {
298 printk(KERN_ERR "No rows, cols or keymap from pdata\n");
299 return -EINVAL;
300 }
301
302 omap_kp = kzalloc(sizeof(struct omap_kp), GFP_KERNEL);
303 input_dev = input_allocate_device();
304 if (!omap_kp || !input_dev) {
305 kfree(omap_kp);
306 input_free_device(input_dev);
307 return -ENOMEM;
308 }
309
310 platform_set_drvdata(pdev, omap_kp);
311
312 omap_kp->input = input_dev;
313
314
315 if (!cpu_is_omap24xx())
316 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
317
318 keymap = pdata->keymap;
319
320 if (pdata->rep)
321 __set_bit(EV_REP, input_dev->evbit);
322
323 if (pdata->delay)
324 omap_kp->delay = pdata->delay;
325
326 if (pdata->row_gpios && pdata->col_gpios) {
327 row_gpios = pdata->row_gpios;
328 col_gpios = pdata->col_gpios;
329 }
330
331 omap_kp->rows = pdata->rows;
332 omap_kp->cols = pdata->cols;
333
334 if (cpu_is_omap24xx()) {
335
336 for (col_idx = 0; col_idx < omap_kp->cols; col_idx++) {
337 if (omap_request_gpio(col_gpios[col_idx]) < 0) {
338 printk(KERN_ERR "Failed to request"
339 "GPIO%d for keypad\n",
340 col_gpios[col_idx]);
341 goto err1;
342 }
343 omap_set_gpio_direction(col_gpios[col_idx], 0);
344 }
345
346 for (row_idx = 0; row_idx < omap_kp->rows; row_idx++) {
347 if (omap_request_gpio(row_gpios[row_idx]) < 0) {
348 printk(KERN_ERR "Failed to request"
349 "GPIO%d for keypad\n",
350 row_gpios[row_idx]);
351 goto err2;
352 }
353 omap_set_gpio_direction(row_gpios[row_idx], 1);
354 }
355 }
356
357 setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp);
358
359
360 tasklet_enable(&kp_tasklet);
361 kp_tasklet.data = (unsigned long) omap_kp;
362
363 ret = device_create_file(&pdev->dev, &dev_attr_enable);
364 if (ret < 0)
365 goto err2;
366
367
368 __set_bit(EV_KEY, input_dev->evbit);
369 for (i = 0; keymap[i] != 0; i++)
370 __set_bit(keymap[i] & KEY_MAX, input_dev->keybit);
371 input_dev->name = "omap-keypad";
372 input_dev->phys = "omap-keypad/input0";
373 input_dev->dev.parent = &pdev->dev;
374
375 input_dev->id.bustype = BUS_HOST;
376 input_dev->id.vendor = 0x0001;
377 input_dev->id.product = 0x0001;
378 input_dev->id.version = 0x0100;
379
380 ret = input_register_device(omap_kp->input);
381 if (ret < 0) {
382 printk(KERN_ERR "Unable to register omap-keypad input device\n");
383 goto err3;
384 }
385
386 if (pdata->dbounce)
387 omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);
388
389
390 omap_kp_scan_keypad(omap_kp, keypad_state);
391 if (!cpu_is_omap24xx()) {
392 omap_kp->irq = platform_get_irq(pdev, 0);
393 if (omap_kp->irq >= 0) {
394 if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
395 "omap-keypad", omap_kp) < 0)
396 goto err4;
397 }
398 omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
399 } else {
400 for (irq_idx = 0; irq_idx < omap_kp->rows; irq_idx++) {
401 if (request_irq(OMAP_GPIO_IRQ(row_gpios[irq_idx]),
402 omap_kp_interrupt,
403 IRQF_TRIGGER_FALLING,
404 "omap-keypad", omap_kp) < 0)
405 goto err5;
406 }
407 }
408 return 0;
409err5:
410 for (i = irq_idx - 1; i >=0; i--)
411 free_irq(row_gpios[i], 0);
412err4:
413 input_unregister_device(omap_kp->input);
414 input_dev = NULL;
415err3:
416 device_remove_file(&pdev->dev, &dev_attr_enable);
417err2:
418 for (i = row_idx-1; i >=0; i--)
419 omap_free_gpio(row_gpios[i]);
420err1:
421 for (i = col_idx-1; i >=0; i--)
422 omap_free_gpio(col_gpios[i]);
423
424 kfree(omap_kp);
425 input_free_device(input_dev);
426
427 return -EINVAL;
428}
429
430static int omap_kp_remove(struct platform_device *pdev)
431{
432 struct omap_kp *omap_kp = platform_get_drvdata(pdev);
433
434
435 tasklet_disable(&kp_tasklet);
436 if (cpu_is_omap24xx()) {
437 int i;
438 for (i = 0; i < omap_kp->cols; i++)
439 omap_free_gpio(col_gpios[i]);
440 for (i = 0; i < omap_kp->rows; i++) {
441 omap_free_gpio(row_gpios[i]);
442 free_irq(OMAP_GPIO_IRQ(row_gpios[i]), 0);
443 }
444 } else {
445 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
446 free_irq(omap_kp->irq, 0);
447 }
448
449 del_timer_sync(&omap_kp->timer);
450 tasklet_kill(&kp_tasklet);
451
452
453 input_unregister_device(omap_kp->input);
454
455 kfree(omap_kp);
456
457 return 0;
458}
459
460static struct platform_driver omap_kp_driver = {
461 .probe = omap_kp_probe,
462 .remove = omap_kp_remove,
463 .suspend = omap_kp_suspend,
464 .resume = omap_kp_resume,
465 .driver = {
466 .name = "omap-keypad",
467 },
468};
469
470static int __devinit omap_kp_init(void)
471{
472 printk(KERN_INFO "OMAP Keypad Driver\n");
473 return platform_driver_register(&omap_kp_driver);
474}
475
476static void __exit omap_kp_exit(void)
477{
478 platform_driver_unregister(&omap_kp_driver);
479}
480
481module_init(omap_kp_init);
482module_exit(omap_kp_exit);
483
484MODULE_AUTHOR("Timo Teräs");
485MODULE_DESCRIPTION("OMAP Keypad Driver");
486MODULE_LICENSE("GPL");
487
