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Linux 2.6.21.1
[linux/fpc-iii.git] / drivers / input / keyboard / omap-keypad.c
blob5680a6d95b2b335c36c8bd6eed067ee87d2d085e
1 /*
2 * linux/drivers/input/keyboard/omap-keypad.c
3 *
4 * OMAP Keypad Driver
5 *
6 * Copyright (C) 2003 Nokia Corporation
7 * Written by Timo Teräs <ext-timo.teras@nokia.com>
8 *
9 * Added support for H2 & H3 Keypad
10 * Copyright (C) 2004 Texas Instruments
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 */
26
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
48 static void omap_kp_tasklet(unsigned long);
49 static void omap_kp_timer(unsigned long);
50
51 static unsigned char keypad_state[8];
52 static DEFINE_MUTEX(kp_enable_mutex);
53 static int kp_enable = 1;
54 static int kp_cur_group = -1;
55
56 struct 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
66 DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0);
67
68 static int *keymap;
69 static unsigned int *row_gpios;
70 static unsigned int *col_gpios;
71
72 #ifdef CONFIG_ARCH_OMAP2
73 static 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
84 static 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
100 static irqreturn_t omap_kp_interrupt(int irq, void *dev_id)
101 {
102 struct omap_kp *omap_kp = dev_id;
103
104 /* disable keyboard interrupt and schedule for handling */
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 /* disable keyboard interrupt and schedule for handling */
111 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
112
113 tasklet_schedule(&kp_tasklet);
114
115 return IRQ_HANDLED;
116 }
117
118 static void omap_kp_timer(unsigned long data)
119 {
120 tasklet_schedule(&kp_tasklet);
121 }
122
123 static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state)
124 {
125 int col = 0;
126
127 /* read the keypad status */
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 /* read the keypad status */
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 /* disable keyboard interrupt and schedule for handling */
142 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
143
144 /* read the keypad status */
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
160 static 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
171 static 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 /* check for any changes */
179 omap_kp_scan_keypad(omap_kp_data, new_state);
180
181 /* check for changes and print those */
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 /* We scan again after a couple of seconds */
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 /* some key is pressed - keep irq disabled and use timer
222 * to poll the keypad */
223 if (spurious)
224 delay = 2 * HZ;
225 mod_timer(&omap_kp_data->timer, jiffies + delay);
226 } else {
227 /* enable interrupts */
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
239 static 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
245 static 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
269 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);
270
271 #ifdef CONFIG_PM
272 static int omap_kp_suspend(struct platform_device *dev, pm_message_t state)
273 {
274 /* Nothing yet */
275
276 return 0;
277 }
278
279 static int omap_kp_resume(struct platform_device *dev)
280 {
281 /* Nothing yet */
282
283 return 0;
284 }
285 #else
286 #define omap_kp_suspend NULL
287 #define omap_kp_resume NULL
288 #endif
289
290 static 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 /* Disable the interrupt for the MPUIO keyboard */
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 /* Cols: outputs */
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 /* Rows: inputs */
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 /* get the irq and init timer*/
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 /* setup input device */
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->cdev.dev = &pdev->dev;
374 input_dev->private = omap_kp;
375
376 input_dev->id.bustype = BUS_HOST;
377 input_dev->id.vendor = 0x0001;
378 input_dev->id.product = 0x0001;
379 input_dev->id.version = 0x0100;
380
381 input_dev->keycode = keymap;
382 input_dev->keycodesize = sizeof(unsigned int);
383 input_dev->keycodemax = pdata->keymapsize;
384
385 ret = input_register_device(omap_kp->input);
386 if (ret < 0) {
387 printk(KERN_ERR "Unable to register omap-keypad input device\n");
388 goto err3;
389 }
390
391 if (pdata->dbounce)
392 omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);
393
394 /* scan current status and enable interrupt */
395 omap_kp_scan_keypad(omap_kp, keypad_state);
396 if (!cpu_is_omap24xx()) {
397 omap_kp->irq = platform_get_irq(pdev, 0);
398 if (omap_kp->irq >= 0) {
399 if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
400 "omap-keypad", omap_kp) < 0)
401 goto err4;
402 }
403 omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
404 } else {
405 for (irq_idx = 0; irq_idx < omap_kp->rows; irq_idx++) {
406 if (request_irq(OMAP_GPIO_IRQ(row_gpios[irq_idx]),
407 omap_kp_interrupt,
408 IRQF_TRIGGER_FALLING,
409 "omap-keypad", omap_kp) < 0)
410 goto err5;
411 }
412 }
413 return 0;
414 err5:
415 for (i = irq_idx-1; i >=0; i--)
416 free_irq(row_gpios[i], 0);
417 err4:
418 input_unregister_device(omap_kp->input);
419 input_dev = NULL;
420 err3:
421 device_remove_file(&pdev->dev, &dev_attr_enable);
422 err2:
423 for (i = row_idx-1; i >=0; i--)
424 omap_free_gpio(row_gpios[i]);
425 err1:
426 for (i = col_idx-1; i >=0; i--)
427 omap_free_gpio(col_gpios[i]);
428
429 kfree(omap_kp);
430 input_free_device(input_dev);
431
432 return -EINVAL;
433 }
434
435 static int omap_kp_remove(struct platform_device *pdev)
436 {
437 struct omap_kp *omap_kp = platform_get_drvdata(pdev);
438
439 /* disable keypad interrupt handling */
440 tasklet_disable(&kp_tasklet);
441 if (cpu_is_omap24xx()) {
442 int i;
443 for (i = 0; i < omap_kp->cols; i++)
444 omap_free_gpio(col_gpios[i]);
445 for (i = 0; i < omap_kp->rows; i++) {
446 omap_free_gpio(row_gpios[i]);
447 free_irq(OMAP_GPIO_IRQ(row_gpios[i]), 0);
448 }
449 } else {
450 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
451 free_irq(omap_kp->irq, 0);
452 }
453
454 del_timer_sync(&omap_kp->timer);
455 tasklet_kill(&kp_tasklet);
456
457 /* unregister everything */
458 input_unregister_device(omap_kp->input);
459
460 kfree(omap_kp);
461
462 return 0;
463 }
464
465 static struct platform_driver omap_kp_driver = {
466 .probe = omap_kp_probe,
467 .remove = omap_kp_remove,
468 .suspend = omap_kp_suspend,
469 .resume = omap_kp_resume,
470 .driver = {
471 .name = "omap-keypad",
472 },
473 };
474
475 static int __devinit omap_kp_init(void)
476 {
477 printk(KERN_INFO "OMAP Keypad Driver\n");
478 return platform_driver_register(&omap_kp_driver);
479 }
480
481 static void __exit omap_kp_exit(void)
482 {
483 platform_driver_unregister(&omap_kp_driver);
484 }
485
486 module_init(omap_kp_init);
487 module_exit(omap_kp_exit);
488
489 MODULE_AUTHOR("Timo Teräs");
490 MODULE_DESCRIPTION("OMAP Keypad Driver");
491 MODULE_LICENSE("GPL");
Linux with added FPC-III support