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rt2x00: Simplify rt2x00_check_rev
[linux/fpc-iii.git] / drivers / input / keyboard / omap-keypad.c
blob058fa8b02c21ee1b939085c024c23884e2f6ca1d
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 <mach/gpio.h>
38 #include <mach/keypad.h>
39 #include <mach/menelaus.h>
40 #include <asm/irq.h>
41 #include <mach/hardware.h>
42 #include <asm/io.h>
43 #include <mach/mux.h>
44
45 #undef NEW_BOARD_LEARNING_MODE
46
47 static void omap_kp_tasklet(unsigned long);
48 static void omap_kp_timer(unsigned long);
49
50 static unsigned char keypad_state[8];
51 static DEFINE_MUTEX(kp_enable_mutex);
52 static int kp_enable = 1;
53 static int kp_cur_group = -1;
54
55 struct omap_kp {
56 struct input_dev *input;
57 struct timer_list timer;
58 int irq;
59 unsigned int rows;
60 unsigned int cols;
61 unsigned long delay;
62 unsigned int debounce;
63 };
64
65 static DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0);
66
67 static int *keymap;
68 static unsigned int *row_gpios;
69 static unsigned int *col_gpios;
70
71 #ifdef CONFIG_ARCH_OMAP2
72 static void set_col_gpio_val(struct omap_kp *omap_kp, u8 value)
73 {
74 int col;
75
76 for (col = 0; col < omap_kp->cols; col++)
77 gpio_set_value(col_gpios[col], value & (1 << col));
78 }
79
80 static u8 get_row_gpio_val(struct omap_kp *omap_kp)
81 {
82 int row;
83 u8 value = 0;
84
85 for (row = 0; row < omap_kp->rows; row++) {
86 if (gpio_get_value(row_gpios[row]))
87 value |= (1 << row);
88 }
89 return value;
90 }
91 #else
92 #define set_col_gpio_val(x, y) do {} while (0)
93 #define get_row_gpio_val(x) 0
94 #endif
95
96 static irqreturn_t omap_kp_interrupt(int irq, void *dev_id)
97 {
98 struct omap_kp *omap_kp = dev_id;
99
100 /* disable keyboard interrupt and schedule for handling */
101 if (cpu_is_omap24xx()) {
102 int i;
103 for (i = 0; i < omap_kp->rows; i++)
104 disable_irq(gpio_to_irq(row_gpios[i]));
105 } else
106 /* disable keyboard interrupt and schedule for handling */
107 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
108
109 tasklet_schedule(&kp_tasklet);
110
111 return IRQ_HANDLED;
112 }
113
114 static void omap_kp_timer(unsigned long data)
115 {
116 tasklet_schedule(&kp_tasklet);
117 }
118
119 static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state)
120 {
121 int col = 0;
122
123 /* read the keypad status */
124 if (cpu_is_omap24xx()) {
125 /* read the keypad status */
126 for (col = 0; col < omap_kp->cols; col++) {
127 set_col_gpio_val(omap_kp, ~(1 << col));
128 state[col] = ~(get_row_gpio_val(omap_kp)) & 0xff;
129 }
130 set_col_gpio_val(omap_kp, 0);
131
132 } else {
133 /* disable keyboard interrupt and schedule for handling */
134 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
135
136 /* read the keypad status */
137 omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
138 for (col = 0; col < omap_kp->cols; col++) {
139 omap_writew(~(1 << col) & 0xff,
140 OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
141
142 udelay(omap_kp->delay);
143
144 state[col] = ~omap_readw(OMAP_MPUIO_BASE +
145 OMAP_MPUIO_KBR_LATCH) & 0xff;
146 }
147 omap_writew(0x00, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
148 udelay(2);
149 }
150 }
151
152 static inline int omap_kp_find_key(int col, int row)
153 {
154 int i, key;
155
156 key = KEY(col, row, 0);
157 for (i = 0; keymap[i] != 0; i++)
158 if ((keymap[i] & 0xff000000) == key)
159 return keymap[i] & 0x00ffffff;
160 return -1;
161 }
162
163 static void omap_kp_tasklet(unsigned long data)
164 {
165 struct omap_kp *omap_kp_data = (struct omap_kp *) data;
166 unsigned char new_state[8], changed, key_down = 0;
167 int col, row;
168 int spurious = 0;
169
170 /* check for any changes */
171 omap_kp_scan_keypad(omap_kp_data, new_state);
172
173 /* check for changes and print those */
174 for (col = 0; col < omap_kp_data->cols; col++) {
175 changed = new_state[col] ^ keypad_state[col];
176 key_down |= new_state[col];
177 if (changed == 0)
178 continue;
179
180 for (row = 0; row < omap_kp_data->rows; row++) {
181 int key;
182 if (!(changed & (1 << row)))
183 continue;
184 #ifdef NEW_BOARD_LEARNING_MODE
185 printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col,
186 row, (new_state[col] & (1 << row)) ?
187 "pressed" : "released");
188 #else
189 key = omap_kp_find_key(col, row);
190 if (key < 0) {
191 printk(KERN_WARNING
192 "omap-keypad: Spurious key event %d-%d\n",
193 col, row);
194 /* We scan again after a couple of seconds */
195 spurious = 1;
196 continue;
197 }
198
199 if (!(kp_cur_group == (key & GROUP_MASK) ||
200 kp_cur_group == -1))
201 continue;
202
203 kp_cur_group = key & GROUP_MASK;
204 input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
205 new_state[col] & (1 << row));
206 #endif
207 }
208 }
209 memcpy(keypad_state, new_state, sizeof(keypad_state));
210
211 if (key_down) {
212 int delay = HZ / 20;
213 /* some key is pressed - keep irq disabled and use timer
214 * to poll the keypad */
215 if (spurious)
216 delay = 2 * HZ;
217 mod_timer(&omap_kp_data->timer, jiffies + delay);
218 } else {
219 /* enable interrupts */
220 if (cpu_is_omap24xx()) {
221 int i;
222 for (i = 0; i < omap_kp_data->rows; i++)
223 enable_irq(gpio_to_irq(row_gpios[i]));
224 } else {
225 omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
226 kp_cur_group = -1;
227 }
228 }
229 }
230
231 static ssize_t omap_kp_enable_show(struct device *dev,
232 struct device_attribute *attr, char *buf)
233 {
234 return sprintf(buf, "%u\n", kp_enable);
235 }
236
237 static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,
238 const char *buf, size_t count)
239 {
240 int state;
241
242 if (sscanf(buf, "%u", &state) != 1)
243 return -EINVAL;
244
245 if ((state != 1) && (state != 0))
246 return -EINVAL;
247
248 mutex_lock(&kp_enable_mutex);
249 if (state != kp_enable) {
250 if (state)
251 enable_irq(INT_KEYBOARD);
252 else
253 disable_irq(INT_KEYBOARD);
254 kp_enable = state;
255 }
256 mutex_unlock(&kp_enable_mutex);
257
258 return strnlen(buf, count);
259 }
260
261 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);
262
263 #ifdef CONFIG_PM
264 static int omap_kp_suspend(struct platform_device *dev, pm_message_t state)
265 {
266 /* Nothing yet */
267
268 return 0;
269 }
270
271 static int omap_kp_resume(struct platform_device *dev)
272 {
273 /* Nothing yet */
274
275 return 0;
276 }
277 #else
278 #define omap_kp_suspend NULL
279 #define omap_kp_resume NULL
280 #endif
281
282 static int __devinit omap_kp_probe(struct platform_device *pdev)
283 {
284 struct omap_kp *omap_kp;
285 struct input_dev *input_dev;
286 struct omap_kp_platform_data *pdata = pdev->dev.platform_data;
287 int i, col_idx, row_idx, irq_idx, ret;
288
289 if (!pdata->rows || !pdata->cols || !pdata->keymap) {
290 printk(KERN_ERR "No rows, cols or keymap from pdata\n");
291 return -EINVAL;
292 }
293
294 omap_kp = kzalloc(sizeof(struct omap_kp), GFP_KERNEL);
295 input_dev = input_allocate_device();
296 if (!omap_kp || !input_dev) {
297 kfree(omap_kp);
298 input_free_device(input_dev);
299 return -ENOMEM;
300 }
301
302 platform_set_drvdata(pdev, omap_kp);
303
304 omap_kp->input = input_dev;
305
306 /* Disable the interrupt for the MPUIO keyboard */
307 if (!cpu_is_omap24xx())
308 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
309
310 keymap = pdata->keymap;
311
312 if (pdata->rep)
313 __set_bit(EV_REP, input_dev->evbit);
314
315 if (pdata->delay)
316 omap_kp->delay = pdata->delay;
317
318 if (pdata->row_gpios && pdata->col_gpios) {
319 row_gpios = pdata->row_gpios;
320 col_gpios = pdata->col_gpios;
321 }
322
323 omap_kp->rows = pdata->rows;
324 omap_kp->cols = pdata->cols;
325
326 if (cpu_is_omap24xx()) {
327 /* Cols: outputs */
328 for (col_idx = 0; col_idx < omap_kp->cols; col_idx++) {
329 if (gpio_request(col_gpios[col_idx], "omap_kp_col") < 0) {
330 printk(KERN_ERR "Failed to request"
331 "GPIO%d for keypad\n",
332 col_gpios[col_idx]);
333 goto err1;
334 }
335 gpio_direction_output(col_gpios[col_idx], 0);
336 }
337 /* Rows: inputs */
338 for (row_idx = 0; row_idx < omap_kp->rows; row_idx++) {
339 if (gpio_request(row_gpios[row_idx], "omap_kp_row") < 0) {
340 printk(KERN_ERR "Failed to request"
341 "GPIO%d for keypad\n",
342 row_gpios[row_idx]);
343 goto err2;
344 }
345 gpio_direction_input(row_gpios[row_idx]);
346 }
347 } else {
348 col_idx = 0;
349 row_idx = 0;
350 }
351
352 setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp);
353
354 /* get the irq and init timer*/
355 tasklet_enable(&kp_tasklet);
356 kp_tasklet.data = (unsigned long) omap_kp;
357
358 ret = device_create_file(&pdev->dev, &dev_attr_enable);
359 if (ret < 0)
360 goto err2;
361
362 /* setup input device */
363 __set_bit(EV_KEY, input_dev->evbit);
364 for (i = 0; keymap[i] != 0; i++)
365 __set_bit(keymap[i] & KEY_MAX, input_dev->keybit);
366 input_dev->name = "omap-keypad";
367 input_dev->phys = "omap-keypad/input0";
368 input_dev->dev.parent = &pdev->dev;
369
370 input_dev->id.bustype = BUS_HOST;
371 input_dev->id.vendor = 0x0001;
372 input_dev->id.product = 0x0001;
373 input_dev->id.version = 0x0100;
374
375 ret = input_register_device(omap_kp->input);
376 if (ret < 0) {
377 printk(KERN_ERR "Unable to register omap-keypad input device\n");
378 goto err3;
379 }
380
381 if (pdata->dbounce)
382 omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);
383
384 /* scan current status and enable interrupt */
385 omap_kp_scan_keypad(omap_kp, keypad_state);
386 if (!cpu_is_omap24xx()) {
387 omap_kp->irq = platform_get_irq(pdev, 0);
388 if (omap_kp->irq >= 0) {
389 if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
390 "omap-keypad", omap_kp) < 0)
391 goto err4;
392 }
393 omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
394 } else {
395 for (irq_idx = 0; irq_idx < omap_kp->rows; irq_idx++) {
396 if (request_irq(gpio_to_irq(row_gpios[irq_idx]),
397 omap_kp_interrupt,
398 IRQF_TRIGGER_FALLING,
399 "omap-keypad", omap_kp) < 0)
400 goto err5;
401 }
402 }
403 return 0;
404 err5:
405 for (i = irq_idx - 1; i >=0; i--)
406 free_irq(row_gpios[i], 0);
407 err4:
408 input_unregister_device(omap_kp->input);
409 input_dev = NULL;
410 err3:
411 device_remove_file(&pdev->dev, &dev_attr_enable);
412 err2:
413 for (i = row_idx - 1; i >=0; i--)
414 gpio_free(row_gpios[i]);
415 err1:
416 for (i = col_idx - 1; i >=0; i--)
417 gpio_free(col_gpios[i]);
418
419 kfree(omap_kp);
420 input_free_device(input_dev);
421
422 return -EINVAL;
423 }
424
425 static int __devexit omap_kp_remove(struct platform_device *pdev)
426 {
427 struct omap_kp *omap_kp = platform_get_drvdata(pdev);
428
429 /* disable keypad interrupt handling */
430 tasklet_disable(&kp_tasklet);
431 if (cpu_is_omap24xx()) {
432 int i;
433 for (i = 0; i < omap_kp->cols; i++)
434 gpio_free(col_gpios[i]);
435 for (i = 0; i < omap_kp->rows; i++) {
436 gpio_free(row_gpios[i]);
437 free_irq(gpio_to_irq(row_gpios[i]), 0);
438 }
439 } else {
440 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
441 free_irq(omap_kp->irq, 0);
442 }
443
444 del_timer_sync(&omap_kp->timer);
445 tasklet_kill(&kp_tasklet);
446
447 /* unregister everything */
448 input_unregister_device(omap_kp->input);
449
450 kfree(omap_kp);
451
452 return 0;
453 }
454
455 static struct platform_driver omap_kp_driver = {
456 .probe = omap_kp_probe,
457 .remove = __devexit_p(omap_kp_remove),
458 .suspend = omap_kp_suspend,
459 .resume = omap_kp_resume,
460 .driver = {
461 .name = "omap-keypad",
462 .owner = THIS_MODULE,
463 },
464 };
465
466 static int __init omap_kp_init(void)
467 {
468 printk(KERN_INFO "OMAP Keypad Driver\n");
469 return platform_driver_register(&omap_kp_driver);
470 }
471
472 static void __exit omap_kp_exit(void)
473 {
474 platform_driver_unregister(&omap_kp_driver);
475 }
476
477 module_init(omap_kp_init);
478 module_exit(omap_kp_exit);
479
480 MODULE_AUTHOR("Timo Teräs");
481 MODULE_DESCRIPTION("OMAP Keypad Driver");
482 MODULE_LICENSE("GPL");
483 MODULE_ALIAS("platform:omap-keypad");
Linux with added FPC-III support