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FRV: Use generic show_interrupts()
[cris-mirror.git] / drivers / input / keyboard / omap-keypad.c
blob0e2a19cb43d812ad784f74ed07dfc9fc8f60fa84
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 <linux/slab.h>
38 #include <mach/gpio.h>
39 #include <plat/keypad.h>
40 #include <plat/menelaus.h>
41 #include <asm/irq.h>
42 #include <mach/hardware.h>
43 #include <asm/io.h>
44 #include <plat/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 static DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0);
67
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
104 for (i = 0; i < omap_kp->rows; i++) {
105 int gpio_irq = gpio_to_irq(row_gpios[i]);
106 /*
107 * The interrupt which we're currently handling should
108 * be disabled _nosync() to avoid deadlocks waiting
109 * for this handler to complete. All others should
110 * be disabled the regular way for SMP safety.
111 */
112 if (gpio_irq == irq)
113 disable_irq_nosync(gpio_irq);
114 else
115 disable_irq(gpio_irq);
116 }
117 } else
118 /* disable keyboard interrupt and schedule for handling */
119 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
120
121 tasklet_schedule(&kp_tasklet);
122
123 return IRQ_HANDLED;
124 }
125
126 static void omap_kp_timer(unsigned long data)
127 {
128 tasklet_schedule(&kp_tasklet);
129 }
130
131 static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state)
132 {
133 int col = 0;
134
135 /* read the keypad status */
136 if (cpu_is_omap24xx()) {
137 /* read the keypad status */
138 for (col = 0; col < omap_kp->cols; col++) {
139 set_col_gpio_val(omap_kp, ~(1 << col));
140 state[col] = ~(get_row_gpio_val(omap_kp)) & 0xff;
141 }
142 set_col_gpio_val(omap_kp, 0);
143
144 } else {
145 /* disable keyboard interrupt and schedule for handling */
146 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
147
148 /* read the keypad status */
149 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
150 for (col = 0; col < omap_kp->cols; col++) {
151 omap_writew(~(1 << col) & 0xff,
152 OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
153
154 udelay(omap_kp->delay);
155
156 state[col] = ~omap_readw(OMAP1_MPUIO_BASE +
157 OMAP_MPUIO_KBR_LATCH) & 0xff;
158 }
159 omap_writew(0x00, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
160 udelay(2);
161 }
162 }
163
164 static void omap_kp_tasklet(unsigned long data)
165 {
166 struct omap_kp *omap_kp_data = (struct omap_kp *) data;
167 unsigned short *keycodes = omap_kp_data->input->keycode;
168 unsigned int row_shift = get_count_order(omap_kp_data->cols);
169 unsigned char new_state[8], changed, key_down = 0;
170 int col, row;
171 int spurious = 0;
172
173 /* check for any changes */
174 omap_kp_scan_keypad(omap_kp_data, new_state);
175
176 /* check for changes and print those */
177 for (col = 0; col < omap_kp_data->cols; col++) {
178 changed = new_state[col] ^ keypad_state[col];
179 key_down |= new_state[col];
180 if (changed == 0)
181 continue;
182
183 for (row = 0; row < omap_kp_data->rows; row++) {
184 int key;
185 if (!(changed & (1 << row)))
186 continue;
187 #ifdef NEW_BOARD_LEARNING_MODE
188 printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col,
189 row, (new_state[col] & (1 << row)) ?
190 "pressed" : "released");
191 #else
192 key = keycodes[MATRIX_SCAN_CODE(row, col, row_shift)];
193 if (key < 0) {
194 printk(KERN_WARNING
195 "omap-keypad: Spurious key event %d-%d\n",
196 col, row);
197 /* We scan again after a couple of seconds */
198 spurious = 1;
199 continue;
200 }
201
202 if (!(kp_cur_group == (key & GROUP_MASK) ||
203 kp_cur_group == -1))
204 continue;
205
206 kp_cur_group = key & GROUP_MASK;
207 input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
208 new_state[col] & (1 << row));
209 #endif
210 }
211 }
212 memcpy(keypad_state, new_state, sizeof(keypad_state));
213
214 if (key_down) {
215 int delay = HZ / 20;
216 /* some key is pressed - keep irq disabled and use timer
217 * to poll the keypad */
218 if (spurious)
219 delay = 2 * HZ;
220 mod_timer(&omap_kp_data->timer, jiffies + delay);
221 } else {
222 /* enable interrupts */
223 if (cpu_is_omap24xx()) {
224 int i;
225 for (i = 0; i < omap_kp_data->rows; i++)
226 enable_irq(gpio_to_irq(row_gpios[i]));
227 } else {
228 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
229 kp_cur_group = -1;
230 }
231 }
232 }
233
234 static ssize_t omap_kp_enable_show(struct device *dev,
235 struct device_attribute *attr, char *buf)
236 {
237 return sprintf(buf, "%u\n", kp_enable);
238 }
239
240 static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,
241 const char *buf, size_t count)
242 {
243 int state;
244
245 if (sscanf(buf, "%u", &state) != 1)
246 return -EINVAL;
247
248 if ((state != 1) && (state != 0))
249 return -EINVAL;
250
251 mutex_lock(&kp_enable_mutex);
252 if (state != kp_enable) {
253 if (state)
254 enable_irq(INT_KEYBOARD);
255 else
256 disable_irq(INT_KEYBOARD);
257 kp_enable = state;
258 }
259 mutex_unlock(&kp_enable_mutex);
260
261 return strnlen(buf, count);
262 }
263
264 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);
265
266 #ifdef CONFIG_PM
267 static int omap_kp_suspend(struct platform_device *dev, pm_message_t state)
268 {
269 /* Nothing yet */
270
271 return 0;
272 }
273
274 static int omap_kp_resume(struct platform_device *dev)
275 {
276 /* Nothing yet */
277
278 return 0;
279 }
280 #else
281 #define omap_kp_suspend NULL
282 #define omap_kp_resume NULL
283 #endif
284
285 static int __devinit omap_kp_probe(struct platform_device *pdev)
286 {
287 struct omap_kp *omap_kp;
288 struct input_dev *input_dev;
289 struct omap_kp_platform_data *pdata = pdev->dev.platform_data;
290 int i, col_idx, row_idx, irq_idx, ret;
291 unsigned int row_shift, keycodemax;
292
293 if (!pdata->rows || !pdata->cols || !pdata->keymap_data) {
294 printk(KERN_ERR "No rows, cols or keymap_data from pdata\n");
295 return -EINVAL;
296 }
297
298 row_shift = get_count_order(pdata->cols);
299 keycodemax = pdata->rows << row_shift;
300
301 omap_kp = kzalloc(sizeof(struct omap_kp) +
302 keycodemax * sizeof(unsigned short), 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, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
317
318 input_dev->keycode = &omap_kp[1];
319 input_dev->keycodesize = sizeof(unsigned short);
320 input_dev->keycodemax = keycodemax;
321
322 if (pdata->rep)
323 __set_bit(EV_REP, input_dev->evbit);
324
325 if (pdata->delay)
326 omap_kp->delay = pdata->delay;
327
328 if (pdata->row_gpios && pdata->col_gpios) {
329 row_gpios = pdata->row_gpios;
330 col_gpios = pdata->col_gpios;
331 }
332
333 omap_kp->rows = pdata->rows;
334 omap_kp->cols = pdata->cols;
335
336 if (cpu_is_omap24xx()) {
337 /* Cols: outputs */
338 for (col_idx = 0; col_idx < omap_kp->cols; col_idx++) {
339 if (gpio_request(col_gpios[col_idx], "omap_kp_col") < 0) {
340 printk(KERN_ERR "Failed to request"
341 "GPIO%d for keypad\n",
342 col_gpios[col_idx]);
343 goto err1;
344 }
345 gpio_direction_output(col_gpios[col_idx], 0);
346 }
347 /* Rows: inputs */
348 for (row_idx = 0; row_idx < omap_kp->rows; row_idx++) {
349 if (gpio_request(row_gpios[row_idx], "omap_kp_row") < 0) {
350 printk(KERN_ERR "Failed to request"
351 "GPIO%d for keypad\n",
352 row_gpios[row_idx]);
353 goto err2;
354 }
355 gpio_direction_input(row_gpios[row_idx]);
356 }
357 } else {
358 col_idx = 0;
359 row_idx = 0;
360 }
361
362 setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp);
363
364 /* get the irq and init timer*/
365 tasklet_enable(&kp_tasklet);
366 kp_tasklet.data = (unsigned long) omap_kp;
367
368 ret = device_create_file(&pdev->dev, &dev_attr_enable);
369 if (ret < 0)
370 goto err2;
371
372 /* setup input device */
373 __set_bit(EV_KEY, input_dev->evbit);
374 matrix_keypad_build_keymap(pdata->keymap_data, row_shift,
375 input_dev->keycode, input_dev->keybit);
376 input_dev->name = "omap-keypad";
377 input_dev->phys = "omap-keypad/input0";
378 input_dev->dev.parent = &pdev->dev;
379
380 input_dev->id.bustype = BUS_HOST;
381 input_dev->id.vendor = 0x0001;
382 input_dev->id.product = 0x0001;
383 input_dev->id.version = 0x0100;
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, OMAP1_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, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
404 } else {
405 for (irq_idx = 0; irq_idx < omap_kp->rows; irq_idx++) {
406 if (request_irq(gpio_to_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], NULL);
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 gpio_free(row_gpios[i]);
425 err1:
426 for (i = col_idx - 1; i >=0; i--)
427 gpio_free(col_gpios[i]);
428
429 kfree(omap_kp);
430 input_free_device(input_dev);
431
432 return -EINVAL;
433 }
434
435 static int __devexit 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 gpio_free(col_gpios[i]);
445 for (i = 0; i < omap_kp->rows; i++) {
446 gpio_free(row_gpios[i]);
447 free_irq(gpio_to_irq(row_gpios[i]), NULL);
448 }
449 } else {
450 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
451 free_irq(omap_kp->irq, NULL);
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 = __devexit_p(omap_kp_remove),
468 .suspend = omap_kp_suspend,
469 .resume = omap_kp_resume,
470 .driver = {
471 .name = "omap-keypad",
472 .owner = THIS_MODULE,
473 },
474 };
475
476 static int __init omap_kp_init(void)
477 {
478 printk(KERN_INFO "OMAP Keypad Driver\n");
479 return platform_driver_register(&omap_kp_driver);
480 }
481
482 static void __exit omap_kp_exit(void)
483 {
484 platform_driver_unregister(&omap_kp_driver);
485 }
486
487 module_init(omap_kp_init);
488 module_exit(omap_kp_exit);
489
490 MODULE_AUTHOR("Timo Teräs");
491 MODULE_DESCRIPTION("OMAP Keypad Driver");
492 MODULE_LICENSE("GPL");
493 MODULE_ALIAS("platform:omap-keypad");
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