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authorKomal Shah <komal_shah802003@yahoo.com>2006-09-29 04:59:19 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-29 12:18:07 -0400
commitad4e09b16ad361c15bd7186dcd118cb901089b97 (patch)
treeeb74ac65ec10ac73eb404a98b34e851fd98bd499 /drivers/input
parent7768a13c252a97e13a552f88f642962768de1fa4 (diff)
[PATCH] OMAP: Add keypad driver
This patch adds support for keypad driver running on different TI OMAP(http://www.ti.com/omap) processor based boards like OSK, H2, H3, H4, Persuas and Nokia 770. Signed-off-by: Komal Shah <komal_shah802003@yahoo.com> Acked-by: Dmitry Torokhov <dtor@mail.ru> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/keyboard/Kconfig9
-rw-r--r--drivers/input/keyboard/Makefile1
-rw-r--r--drivers/input/keyboard/omap-keypad.c492
3 files changed, 502 insertions, 0 deletions
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index a9dda56f62c4..83eac3a66bc8 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -183,4 +183,13 @@ config KEYBOARD_HIL
183 This driver implements support for HIL-keyboards attached 183 This driver implements support for HIL-keyboards attached
184 to your machine, so normally you should say Y here. 184 to your machine, so normally you should say Y here.
185 185
186config KEYBOARD_OMAP
187 tristate "TI OMAP keypad support"
188 depends on (ARCH_OMAP1 || ARCH_OMAP2)
189 help
190 Say Y here if you want to use the OMAP keypad.
191
192 To compile this driver as a module, choose M here: the
193 module will be called omap-keypad.
194
186endif 195endif
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 2708167ba175..b265391f1f10 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -15,4 +15,5 @@ obj-$(CONFIG_KEYBOARD_CORGI) += corgikbd.o
15obj-$(CONFIG_KEYBOARD_SPITZ) += spitzkbd.o 15obj-$(CONFIG_KEYBOARD_SPITZ) += spitzkbd.o
16obj-$(CONFIG_KEYBOARD_HIL) += hil_kbd.o 16obj-$(CONFIG_KEYBOARD_HIL) += hil_kbd.o
17obj-$(CONFIG_KEYBOARD_HIL_OLD) += hilkbd.o 17obj-$(CONFIG_KEYBOARD_HIL_OLD) += hilkbd.o
18obj-$(CONFIG_KEYBOARD_OMAP) += omap-keypad.o
18 19
diff --git a/drivers/input/keyboard/omap-keypad.c b/drivers/input/keyboard/omap-keypad.c
new file mode 100644
index 000000000000..d436287d1d2e
--- /dev/null
+++ b/drivers/input/keyboard/omap-keypad.c
@@ -0,0 +1,492 @@
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
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 struct pt_regs *regs)
102{
103 struct omap_kp *omap_kp = dev_id;
104
105 /* disable keyboard interrupt and schedule for handling */
106 if (cpu_is_omap24xx()) {
107 int i;
108 for (i = 0; i < omap_kp->rows; i++)
109 disable_irq(OMAP_GPIO_IRQ(row_gpios[i]));
110 } else
111 /* disable keyboard interrupt and schedule for handling */
112 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
113
114 tasklet_schedule(&kp_tasklet);
115
116 return IRQ_HANDLED;
117}
118
119static void omap_kp_timer(unsigned long data)
120{
121 tasklet_schedule(&kp_tasklet);
122}
123
124static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state)
125{
126 int col = 0;
127
128 /* read the keypad status */
129 if (cpu_is_omap24xx()) {
130 int i;
131 for (i = 0; i < omap_kp->rows; i++)
132 disable_irq(OMAP_GPIO_IRQ(row_gpios[i]));
133
134 /* read the keypad status */
135 for (col = 0; col < omap_kp->cols; col++) {
136 set_col_gpio_val(omap_kp, ~(1 << col));
137 state[col] = ~(get_row_gpio_val(omap_kp)) & 0x3f;
138 }
139 set_col_gpio_val(omap_kp, 0);
140
141 } else {
142 /* disable keyboard interrupt and schedule for handling */
143 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
144
145 /* read the keypad status */
146 omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
147 for (col = 0; col < omap_kp->cols; col++) {
148 omap_writew(~(1 << col) & 0xff,
149 OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
150
151 udelay(omap_kp->delay);
152
153 state[col] = ~omap_readw(OMAP_MPUIO_BASE +
154 OMAP_MPUIO_KBR_LATCH) & 0xff;
155 }
156 omap_writew(0x00, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
157 udelay(2);
158 }
159}
160
161static inline int omap_kp_find_key(int col, int row)
162{
163 int i, key;
164
165 key = KEY(col, row, 0);
166 for (i = 0; keymap[i] != 0; i++)
167 if ((keymap[i] & 0xff000000) == key)
168 return keymap[i] & 0x00ffffff;
169 return -1;
170}
171
172static void omap_kp_tasklet(unsigned long data)
173{
174 struct omap_kp *omap_kp_data = (struct omap_kp *) data;
175 unsigned char new_state[8], changed, key_down = 0;
176 int col, row;
177 int spurious = 0;
178
179 /* check for any changes */
180 omap_kp_scan_keypad(omap_kp_data, new_state);
181
182 /* check for changes and print those */
183 for (col = 0; col < omap_kp_data->cols; col++) {
184 changed = new_state[col] ^ keypad_state[col];
185 key_down |= new_state[col];
186 if (changed == 0)
187 continue;
188
189 for (row = 0; row < omap_kp_data->rows; row++) {
190 int key;
191 if (!(changed & (1 << row)))
192 continue;
193#ifdef NEW_BOARD_LEARNING_MODE
194 printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col,
195 row, (new_state[col] & (1 << row)) ?
196 "pressed" : "released");
197#else
198 key = omap_kp_find_key(col, row);
199 if (key < 0) {
200 printk(KERN_WARNING
201 "omap-keypad: Spurious key event %d-%d\n",
202 col, row);
203 /* We scan again after a couple of seconds */
204 spurious = 1;
205 continue;
206 }
207
208 if (!(kp_cur_group == (key & GROUP_MASK) ||
209 kp_cur_group == -1))
210 continue;
211
212 kp_cur_group = key & GROUP_MASK;
213 input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
214 new_state[col] & (1 << row));
215#endif
216 }
217 }
218 memcpy(keypad_state, new_state, sizeof(keypad_state));
219
220 if (key_down) {
221 int delay = HZ / 20;
222 /* some key is pressed - keep irq disabled and use timer
223 * to poll the keypad */
224 if (spurious)
225 delay = 2 * HZ;
226 mod_timer(&omap_kp_data->timer, jiffies + delay);
227 } else {
228 /* enable interrupts */
229 if (cpu_is_omap24xx()) {
230 int i;
231 for (i = 0; i < omap_kp_data->rows; i++)
232 enable_irq(OMAP_GPIO_IRQ(row_gpios[i]));
233 } else {
234 omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
235 kp_cur_group = -1;
236 }
237 }
238}
239
240static ssize_t omap_kp_enable_show(struct device *dev,
241 struct device_attribute *attr, char *buf)
242{
243 return sprintf(buf, "%u\n", kp_enable);
244}
245
246static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,
247 const char *buf, size_t count)
248{
249 int state;
250
251 if (sscanf(buf, "%u", &state) != 1)
252 return -EINVAL;
253
254 if ((state != 1) && (state != 0))
255 return -EINVAL;
256
257 mutex_lock(&kp_enable_mutex);
258 if (state != kp_enable) {
259 if (state)
260 enable_irq(INT_KEYBOARD);
261 else
262 disable_irq(INT_KEYBOARD);
263 kp_enable = state;
264 }
265 mutex_unlock(&kp_enable_mutex);
266
267 return strnlen(buf, count);
268}
269
270static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);
271
272#ifdef CONFIG_PM
273static int omap_kp_suspend(struct platform_device *dev, pm_message_t state)
274{
275 /* Nothing yet */
276
277 return 0;
278}
279
280static int omap_kp_resume(struct platform_device *dev)
281{
282 /* Nothing yet */
283
284 return 0;
285}
286#else
287#define omap_kp_suspend NULL
288#define omap_kp_resume NULL
289#endif
290
291static int __init omap_kp_probe(struct platform_device *pdev)
292{
293 struct omap_kp *omap_kp;
294 struct input_dev *input_dev;
295 struct omap_kp_platform_data *pdata = pdev->dev.platform_data;
296 int i, col_idx, row_idx, irq_idx, ret;
297
298 if (!pdata->rows || !pdata->cols || !pdata->keymap) {
299 printk(KERN_ERR "No rows, cols or keymap from pdata\n");
300 return -EINVAL;
301 }
302
303 omap_kp = kzalloc(sizeof(struct omap_kp), GFP_KERNEL);
304 input_dev = input_allocate_device();
305 if (!omap_kp || !input_dev) {
306 kfree(omap_kp);
307 input_free_device(input_dev);
308 return -ENOMEM;
309 }
310
311 platform_set_drvdata(pdev, omap_kp);
312
313 omap_kp->input = input_dev;
314
315 /* Disable the interrupt for the MPUIO keyboard */
316 if (!cpu_is_omap24xx())
317 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
318
319 keymap = pdata->keymap;
320
321 if (pdata->rep)
322 set_bit(EV_REP, input_dev->evbit);
323
324 if (pdata->delay)
325 omap_kp->delay = pdata->delay;
326
327 if (pdata->row_gpios && pdata->col_gpios) {
328 row_gpios = pdata->row_gpios;
329 col_gpios = pdata->col_gpios;
330 }
331
332 omap_kp->rows = pdata->rows;
333 omap_kp->cols = pdata->cols;
334
335 if (cpu_is_omap24xx()) {
336 /* Cols: outputs */
337 for (col_idx = 0; col_idx < omap_kp->cols; col_idx++) {
338 if (omap_request_gpio(col_gpios[col_idx]) < 0) {
339 printk(KERN_ERR "Failed to request"
340 "GPIO%d for keypad\n",
341 col_gpios[col_idx]);
342 goto err1;
343 }
344 omap_set_gpio_direction(col_gpios[col_idx], 0);
345 }
346 /* Rows: inputs */
347 for (row_idx = 0; row_idx < omap_kp->rows; row_idx++) {
348 if (omap_request_gpio(row_gpios[row_idx]) < 0) {
349 printk(KERN_ERR "Failed to request"
350 "GPIO%d for keypad\n",
351 row_gpios[row_idx]);
352 goto err2;
353 }
354 omap_set_gpio_direction(row_gpios[row_idx], 1);
355 }
356 }
357
358 setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp);
359
360 /* get the irq and init timer*/
361 tasklet_enable(&kp_tasklet);
362 kp_tasklet.data = (unsigned long) omap_kp;
363
364 ret = device_create_file(&pdev->dev, &dev_attr_enable);
365 if (ret < 0)
366 goto err2;
367
368 /* setup input device */
369 set_bit(EV_KEY, input_dev->evbit);
370 for (i = 0; keymap[i] != 0; i++)
371 set_bit(keymap[i] & KEY_MAX, input_dev->keybit);
372 input_dev->name = "omap-keypad";
373 input_dev->phys = "omap-keypad/input0";
374 input_dev->cdev.dev = &pdev->dev;
375 input_dev->private = omap_kp;
376
377 input_dev->id.bustype = BUS_HOST;
378 input_dev->id.vendor = 0x0001;
379 input_dev->id.product = 0x0001;
380 input_dev->id.version = 0x0100;
381
382 input_dev->keycode = keymap;
383 input_dev->keycodesize = sizeof(unsigned int);
384 input_dev->keycodemax = pdata->keymapsize;
385
386 ret = input_register_device(omap_kp->input);
387 if (ret < 0) {
388 printk(KERN_ERR "Unable to register omap-keypad input device\n");
389 goto err3;
390 }
391
392 if (pdata->dbounce)
393 omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);
394
395 /* scan current status and enable interrupt */
396 omap_kp_scan_keypad(omap_kp, keypad_state);
397 if (!cpu_is_omap24xx()) {
398 omap_kp->irq = platform_get_irq(pdev, 0);
399 if (omap_kp->irq >= 0) {
400 if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
401 "omap-keypad", omap_kp) < 0)
402 goto err4;
403 }
404 omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
405 } else {
406 for (irq_idx = 0; irq_idx < omap_kp->rows; irq_idx++) {
407 if (request_irq(OMAP_GPIO_IRQ(row_gpios[irq_idx]),
408 omap_kp_interrupt,
409 IRQF_TRIGGER_FALLING,
410 "omap-keypad", omap_kp) < 0)
411 goto err5;
412 }
413 }
414 return 0;
415err5:
416 for (i = irq_idx-1; i >=0; i--)
417 free_irq(row_gpios[i], 0);
418err4:
419 input_unregister_device(omap_kp->input);
420 input_dev = NULL;
421err3:
422 device_remove_file(&pdev->dev, &dev_attr_enable);
423err2:
424 for (i = row_idx-1; i >=0; i--)
425 omap_free_gpio(row_gpios[i]);
426err1:
427 for (i = col_idx-1; i >=0; i--)
428 omap_free_gpio(col_gpios[i]);
429
430 kfree(omap_kp);
431 input_free_device(input_dev);
432
433 return -EINVAL;
434}
435
436static int omap_kp_remove(struct platform_device *pdev)
437{
438 struct omap_kp *omap_kp = platform_get_drvdata(pdev);
439
440 /* disable keypad interrupt handling */
441 tasklet_disable(&kp_tasklet);
442 if (cpu_is_omap24xx()) {
443 int i;
444 for (i = 0; i < omap_kp->cols; i++)
445 omap_free_gpio(col_gpios[i]);
446 for (i = 0; i < omap_kp->rows; i++) {
447 omap_free_gpio(row_gpios[i]);
448 free_irq(OMAP_GPIO_IRQ(row_gpios[i]), 0);
449 }
450 } else {
451 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
452 free_irq(omap_kp->irq, 0);
453 }
454
455 del_timer_sync(&omap_kp->timer);
456 tasklet_kill(&kp_tasklet);
457
458 /* unregister everything */
459 input_unregister_device(omap_kp->input);
460
461 kfree(omap_kp);
462
463 return 0;
464}
465
466static struct platform_driver omap_kp_driver = {
467 .probe = omap_kp_probe,
468 .remove = omap_kp_remove,
469 .suspend = omap_kp_suspend,
470 .resume = omap_kp_resume,
471 .driver = {
472 .name = "omap-keypad",
473 },
474};
475
476static int __devinit omap_kp_init(void)
477{
478 printk(KERN_INFO "OMAP Keypad Driver\n");
479 return platform_driver_register(&omap_kp_driver);
480}
481
482static void __exit omap_kp_exit(void)
483{
484 platform_driver_unregister(&omap_kp_driver);
485}
486
487module_init(omap_kp_init);
488module_exit(omap_kp_exit);
489
490MODULE_AUTHOR("Timo Teräs");
491MODULE_DESCRIPTION("OMAP Keypad Driver");
492MODULE_LICENSE("GPL");