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x86/amd-iommu: Add per IOMMU reference counting
[linux/fpc-iii.git] / drivers / input / keyboard / omap-keypad.c
blobbba85add35a3df5d1eb5716d282199be8ed5c5c4
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
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 inline int omap_kp_find_key(int col, int row)
165 {
166 int i, key;
167
168 key = KEY(col, row, 0);
169 for (i = 0; keymap[i] != 0; i++)
170 if ((keymap[i] & 0xff000000) == key)
171 return keymap[i] & 0x00ffffff;
172 return -1;
173 }
174
175 static void omap_kp_tasklet(unsigned long data)
176 {
177 struct omap_kp *omap_kp_data = (struct omap_kp *) data;
178 unsigned char new_state[8], changed, key_down = 0;
179 int col, row;
180 int spurious = 0;
181
182 /* check for any changes */
183 omap_kp_scan_keypad(omap_kp_data, new_state);
184
185 /* check for changes and print those */
186 for (col = 0; col < omap_kp_data->cols; col++) {
187 changed = new_state[col] ^ keypad_state[col];
188 key_down |= new_state[col];
189 if (changed == 0)
190 continue;
191
192 for (row = 0; row < omap_kp_data->rows; row++) {
193 int key;
194 if (!(changed & (1 << row)))
195 continue;
196 #ifdef NEW_BOARD_LEARNING_MODE
197 printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col,
198 row, (new_state[col] & (1 << row)) ?
199 "pressed" : "released");
200 #else
201 key = omap_kp_find_key(col, row);
202 if (key < 0) {
203 printk(KERN_WARNING
204 "omap-keypad: Spurious key event %d-%d\n",
205 col, row);
206 /* We scan again after a couple of seconds */
207 spurious = 1;
208 continue;
209 }
210
211 if (!(kp_cur_group == (key & GROUP_MASK) ||
212 kp_cur_group == -1))
213 continue;
214
215 kp_cur_group = key & GROUP_MASK;
216 input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
217 new_state[col] & (1 << row));
218 #endif
219 }
220 }
221 memcpy(keypad_state, new_state, sizeof(keypad_state));
222
223 if (key_down) {
224 int delay = HZ / 20;
225 /* some key is pressed - keep irq disabled and use timer
226 * to poll the keypad */
227 if (spurious)
228 delay = 2 * HZ;
229 mod_timer(&omap_kp_data->timer, jiffies + delay);
230 } else {
231 /* enable interrupts */
232 if (cpu_is_omap24xx()) {
233 int i;
234 for (i = 0; i < omap_kp_data->rows; i++)
235 enable_irq(gpio_to_irq(row_gpios[i]));
236 } else {
237 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
238 kp_cur_group = -1;
239 }
240 }
241 }
242
243 static ssize_t omap_kp_enable_show(struct device *dev,
244 struct device_attribute *attr, char *buf)
245 {
246 return sprintf(buf, "%u\n", kp_enable);
247 }
248
249 static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,
250 const char *buf, size_t count)
251 {
252 int state;
253
254 if (sscanf(buf, "%u", &state) != 1)
255 return -EINVAL;
256
257 if ((state != 1) && (state != 0))
258 return -EINVAL;
259
260 mutex_lock(&kp_enable_mutex);
261 if (state != kp_enable) {
262 if (state)
263 enable_irq(INT_KEYBOARD);
264 else
265 disable_irq(INT_KEYBOARD);
266 kp_enable = state;
267 }
268 mutex_unlock(&kp_enable_mutex);
269
270 return strnlen(buf, count);
271 }
272
273 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);
274
275 #ifdef CONFIG_PM
276 static int omap_kp_suspend(struct platform_device *dev, pm_message_t state)
277 {
278 /* Nothing yet */
279
280 return 0;
281 }
282
283 static int omap_kp_resume(struct platform_device *dev)
284 {
285 /* Nothing yet */
286
287 return 0;
288 }
289 #else
290 #define omap_kp_suspend NULL
291 #define omap_kp_resume NULL
292 #endif
293
294 static int __devinit omap_kp_probe(struct platform_device *pdev)
295 {
296 struct omap_kp *omap_kp;
297 struct input_dev *input_dev;
298 struct omap_kp_platform_data *pdata = pdev->dev.platform_data;
299 int i, col_idx, row_idx, irq_idx, ret;
300
301 if (!pdata->rows || !pdata->cols || !pdata->keymap) {
302 printk(KERN_ERR "No rows, cols or keymap from pdata\n");
303 return -EINVAL;
304 }
305
306 omap_kp = kzalloc(sizeof(struct omap_kp), GFP_KERNEL);
307 input_dev = input_allocate_device();
308 if (!omap_kp || !input_dev) {
309 kfree(omap_kp);
310 input_free_device(input_dev);
311 return -ENOMEM;
312 }
313
314 platform_set_drvdata(pdev, omap_kp);
315
316 omap_kp->input = input_dev;
317
318 /* Disable the interrupt for the MPUIO keyboard */
319 if (!cpu_is_omap24xx())
320 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
321
322 keymap = pdata->keymap;
323
324 if (pdata->rep)
325 __set_bit(EV_REP, input_dev->evbit);
326
327 if (pdata->delay)
328 omap_kp->delay = pdata->delay;
329
330 if (pdata->row_gpios && pdata->col_gpios) {
331 row_gpios = pdata->row_gpios;
332 col_gpios = pdata->col_gpios;
333 }
334
335 omap_kp->rows = pdata->rows;
336 omap_kp->cols = pdata->cols;
337
338 if (cpu_is_omap24xx()) {
339 /* Cols: outputs */
340 for (col_idx = 0; col_idx < omap_kp->cols; col_idx++) {
341 if (gpio_request(col_gpios[col_idx], "omap_kp_col") < 0) {
342 printk(KERN_ERR "Failed to request"
343 "GPIO%d for keypad\n",
344 col_gpios[col_idx]);
345 goto err1;
346 }
347 gpio_direction_output(col_gpios[col_idx], 0);
348 }
349 /* Rows: inputs */
350 for (row_idx = 0; row_idx < omap_kp->rows; row_idx++) {
351 if (gpio_request(row_gpios[row_idx], "omap_kp_row") < 0) {
352 printk(KERN_ERR "Failed to request"
353 "GPIO%d for keypad\n",
354 row_gpios[row_idx]);
355 goto err2;
356 }
357 gpio_direction_input(row_gpios[row_idx]);
358 }
359 } else {
360 col_idx = 0;
361 row_idx = 0;
362 }
363
364 setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp);
365
366 /* get the irq and init timer*/
367 tasklet_enable(&kp_tasklet);
368 kp_tasklet.data = (unsigned long) omap_kp;
369
370 ret = device_create_file(&pdev->dev, &dev_attr_enable);
371 if (ret < 0)
372 goto err2;
373
374 /* setup input device */
375 __set_bit(EV_KEY, input_dev->evbit);
376 for (i = 0; keymap[i] != 0; i++)
377 __set_bit(keymap[i] & KEY_MAX, input_dev->keybit);
378 input_dev->name = "omap-keypad";
379 input_dev->phys = "omap-keypad/input0";
380 input_dev->dev.parent = &pdev->dev;
381
382 input_dev->id.bustype = BUS_HOST;
383 input_dev->id.vendor = 0x0001;
384 input_dev->id.product = 0x0001;
385 input_dev->id.version = 0x0100;
386
387 ret = input_register_device(omap_kp->input);
388 if (ret < 0) {
389 printk(KERN_ERR "Unable to register omap-keypad input device\n");
390 goto err3;
391 }
392
393 if (pdata->dbounce)
394 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);
395
396 /* scan current status and enable interrupt */
397 omap_kp_scan_keypad(omap_kp, keypad_state);
398 if (!cpu_is_omap24xx()) {
399 omap_kp->irq = platform_get_irq(pdev, 0);
400 if (omap_kp->irq >= 0) {
401 if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
402 "omap-keypad", omap_kp) < 0)
403 goto err4;
404 }
405 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
406 } else {
407 for (irq_idx = 0; irq_idx < omap_kp->rows; irq_idx++) {
408 if (request_irq(gpio_to_irq(row_gpios[irq_idx]),
409 omap_kp_interrupt,
410 IRQF_TRIGGER_FALLING,
411 "omap-keypad", omap_kp) < 0)
412 goto err5;
413 }
414 }
415 return 0;
416 err5:
417 for (i = irq_idx - 1; i >=0; i--)
418 free_irq(row_gpios[i], 0);
419 err4:
420 input_unregister_device(omap_kp->input);
421 input_dev = NULL;
422 err3:
423 device_remove_file(&pdev->dev, &dev_attr_enable);
424 err2:
425 for (i = row_idx - 1; i >=0; i--)
426 gpio_free(row_gpios[i]);
427 err1:
428 for (i = col_idx - 1; i >=0; i--)
429 gpio_free(col_gpios[i]);
430
431 kfree(omap_kp);
432 input_free_device(input_dev);
433
434 return -EINVAL;
435 }
436
437 static int __devexit omap_kp_remove(struct platform_device *pdev)
438 {
439 struct omap_kp *omap_kp = platform_get_drvdata(pdev);
440
441 /* disable keypad interrupt handling */
442 tasklet_disable(&kp_tasklet);
443 if (cpu_is_omap24xx()) {
444 int i;
445 for (i = 0; i < omap_kp->cols; i++)
446 gpio_free(col_gpios[i]);
447 for (i = 0; i < omap_kp->rows; i++) {
448 gpio_free(row_gpios[i]);
449 free_irq(gpio_to_irq(row_gpios[i]), 0);
450 }
451 } else {
452 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
453 free_irq(omap_kp->irq, 0);
454 }
455
456 del_timer_sync(&omap_kp->timer);
457 tasklet_kill(&kp_tasklet);
458
459 /* unregister everything */
460 input_unregister_device(omap_kp->input);
461
462 kfree(omap_kp);
463
464 return 0;
465 }
466
467 static struct platform_driver omap_kp_driver = {
468 .probe = omap_kp_probe,
469 .remove = __devexit_p(omap_kp_remove),
470 .suspend = omap_kp_suspend,
471 .resume = omap_kp_resume,
472 .driver = {
473 .name = "omap-keypad",
474 .owner = THIS_MODULE,
475 },
476 };
477
478 static int __init omap_kp_init(void)
479 {
480 printk(KERN_INFO "OMAP Keypad Driver\n");
481 return platform_driver_register(&omap_kp_driver);
482 }
483
484 static void __exit omap_kp_exit(void)
485 {
486 platform_driver_unregister(&omap_kp_driver);
487 }
488
489 module_init(omap_kp_init);
490 module_exit(omap_kp_exit);
491
492 MODULE_AUTHOR("Timo Teräs");
493 MODULE_DESCRIPTION("OMAP Keypad Driver");
494 MODULE_LICENSE("GPL");
495 MODULE_ALIAS("platform:omap-keypad");
Linux with added FPC-III support