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[linux-2.6-omap-h63xx.git] / drivers / input / keyboard / omap-keypad.c
1 /*
2  * linux/drivers/char/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 <asm/arch/irqs.h>
37 #include <asm/arch/gpio.h>
38 #include <asm/arch/hardware.h>
39 #include <asm/arch/keypad.h>
40 #include <asm/arch/menelaus.h>
41 #include <asm/io.h>
42 #include <asm/errno.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         unsigned int irq;
60         unsigned int rows;
61         unsigned int cols;
62 };
63
64 DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0);
65
66 static int *keymap;
67 static unsigned int *row_gpios;
68 static unsigned int *col_gpios;
69
70 #ifdef CONFIG_ARCH_OMAP2
71 static void set_col_gpio_val(struct omap_kp *omap_kp, u8 value)
72 {
73         int col;
74         for (col = 0; col < omap_kp->cols; col++) {
75                 if (value & (1 << col))
76                         omap_set_gpio_dataout(col_gpios[col], 1);
77                 else
78                         omap_set_gpio_dataout(col_gpios[col], 0);
79         }
80 }
81
82 static u8 get_row_gpio_val(struct omap_kp *omap_kp)
83 {
84         int row;
85         u8 value = 0;
86
87         for (row = 0; row < omap_kp->rows; row++) {
88                 if (omap_get_gpio_datain(row_gpios[row]))
89                         value |= (1 << row);
90         }
91         return value;
92 }
93 #else
94 #define         set_col_gpio_val(x, y)  do {} while (0)
95 #define         get_row_gpio_val(x)     0
96 #endif
97
98 static irqreturn_t omap_kp_interrupt(int irq, void *dev_id,
99                                      struct pt_regs *regs)
100 {
101         struct omap_kp *omap_kp = dev_id;
102
103         /* disable keyboard interrupt and schedule for handling */
104         if (cpu_is_omap24xx()) {
105                 int i;
106                 for (i = 0; i < omap_kp->rows; i++)
107                         disable_irq(OMAP_GPIO_IRQ(row_gpios[i]));
108         } else {
109                 /* disable keyboard interrupt and schedule for handling */
110                 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
111         }
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         } else {
133                 /* disable keyboard interrupt and schedule for handling */
134                 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
135         }
136         if (!cpu_is_omap24xx()) {
137                 /* read the keypad status */
138                 omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
139                 for (col = 0; col < omap_kp->cols; col++) {
140                         omap_writew(~(1 << col) & 0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
141
142                         if (machine_is_omap_osk() || machine_is_omap_h2() || machine_is_omap_h3()) {
143                                 udelay(9);
144                         } else {
145                                 udelay(4);
146                         }
147                         state[col] = ~omap_readw(OMAP_MPUIO_BASE + OMAP_MPUIO_KBR_LATCH) & 0xff;
148                 }
149                 omap_writew(0x00, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
150                 udelay(2);
151         } else {
152                 /* read the keypad status */
153                 for (col = 0; col < omap_kp->cols; col++) {
154                         set_col_gpio_val(omap_kp, ~(1 << col));
155                         state[col] = ~(get_row_gpio_val(omap_kp)) & 0x3f;
156                 }
157                 set_col_gpio_val(omap_kp, 0);
158         }
159 }
160
161 static 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
172 static 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, row, (new_state[col] & (1 << row)) ? "pressed" : "released");
195 #else
196                         key = omap_kp_find_key(col, row);
197                         if (key < 0) {
198                                 printk(KERN_WARNING "omap-keypad: Spurious key event %d-%d\n",
199                                        col, row);
200                                 /* We scan again after a couple of seconds */
201                                 spurious = 1;
202                                 continue;
203                         }
204
205                         if (!(kp_cur_group == (key & GROUP_MASK) ||
206                               kp_cur_group == -1))
207                                 continue;
208
209                         kp_cur_group = key & GROUP_MASK;
210                         input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
211                                          !!(new_state[col] & (1 << row)));
212 #endif
213                 }
214         }
215         memcpy(keypad_state, new_state, sizeof(keypad_state));
216
217         if (key_down) {
218                 int delay = HZ / 20;
219                 /* some key is pressed - keep irq disabled and use timer
220                  * to poll the keypad */
221                 if (spurious)
222                         delay = 2 * HZ;
223                 mod_timer(&omap_kp_data->timer, jiffies + delay);
224         } else {
225                 /* enable interrupts */
226                 if (cpu_is_omap24xx()) {
227                         int i;
228                         for (i = 0; i < omap_kp_data->rows; i++)
229                                 enable_irq(OMAP_GPIO_IRQ(row_gpios[i]));
230                 } else {
231                         omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
232                         kp_cur_group = -1;
233                 }
234         }
235 }
236
237 static ssize_t omap_kp_enable_show(struct device *dev, 
238                                    struct device_attribute *attr, char *buf)
239 {
240         return sprintf(buf, "%u\n", kp_enable);
241 }
242
243 static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,
244                                     const char *buf, size_t count)
245 {
246         int state;
247
248         if (sscanf(buf, "%u", &state) != 1)
249                 return -EINVAL;
250
251         if ((state != 1) && (state != 0))
252                 return -EINVAL;
253
254         mutex_lock(&kp_enable_mutex);
255         if (state != kp_enable) {
256                 if (state)
257                         enable_irq(INT_KEYBOARD);
258                 else
259                         disable_irq(INT_KEYBOARD);
260                 kp_enable = state;
261         }
262         mutex_unlock(&kp_enable_mutex);
263
264         return strnlen(buf, count);
265 }
266
267 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);
268
269 #ifdef CONFIG_PM
270 static int omap_kp_suspend(struct platform_device *dev, pm_message_t state)
271 {
272         /* Nothing yet */
273
274         return 0;
275 }
276
277 static int omap_kp_resume(struct platform_device *dev)
278 {
279         /* Nothing yet */
280
281         return 0;
282 }
283 #else
284 #define omap_kp_suspend NULL
285 #define omap_kp_resume  NULL
286 #endif
287
288 static int __init omap_kp_probe(struct platform_device *pdev)
289 {
290         struct omap_kp *omap_kp;
291         struct input_dev *input_dev;
292         struct omap_kp_platform_data *pdata =  pdev->dev.platform_data;
293         int i;
294
295         if (!pdata->rows || !pdata->cols || !pdata->keymap) {
296                 printk(KERN_ERR "No rows, cols or keymap from pdata\n");
297                 return -EINVAL;
298         }
299
300         omap_kp = kzalloc(sizeof(struct omap_kp), GFP_KERNEL);
301         input_dev = input_allocate_device();
302         if (!omap_kp || !input_dev) {
303                 kfree(omap_kp);
304                 input_free_device(input_dev);
305                 return -ENOMEM;
306         }
307
308         platform_set_drvdata(pdev, omap_kp);
309
310         omap_kp->input = input_dev;
311
312         /* Disable the interrupt for the MPUIO keyboard */
313         if (!cpu_is_omap24xx())
314                 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
315
316         keymap = pdata->keymap;
317
318         if (pdata->rep)
319                 set_bit(EV_REP, input_dev->evbit);
320
321         if (pdata->row_gpios && pdata->col_gpios) {
322                 row_gpios = pdata->row_gpios;
323                 col_gpios = pdata->col_gpios;
324         }
325
326         omap_kp->rows = pdata->rows;
327         omap_kp->cols = pdata->cols;
328
329         if (cpu_is_omap24xx()) {
330                 /* Cols: outputs */
331                 for (i = 0; i < omap_kp->cols; i++) {
332                         if (omap_request_gpio(col_gpios[i]) < 0) {
333                                 printk(KERN_ERR "Failed to request"
334                                        "GPIO%d for keypad\n",
335                                        col_gpios[i]);
336                                 return -EINVAL;
337                         }
338                         omap_set_gpio_direction(col_gpios[i], 0);
339                 }
340                 /* Rows: inputs */
341                 for (i = 0; i < omap_kp->rows; i++) {
342                         if (omap_request_gpio(row_gpios[i]) < 0) {
343                                 printk(KERN_ERR "Failed to request"
344                                        "GPIO%d for keypad\n",
345                                        row_gpios[i]);
346                                 return -EINVAL;
347                         }
348                         omap_set_gpio_direction(row_gpios[i], 1);
349                 }
350         }
351
352         init_timer(&omap_kp->timer);
353         omap_kp->timer.function = omap_kp_timer;
354         omap_kp->timer.data = (unsigned long) omap_kp;
355
356         /* get the irq and init timer*/
357         tasklet_enable(&kp_tasklet);
358         kp_tasklet.data = (unsigned long) omap_kp;
359
360         omap_kp->irq = platform_get_irq(pdev, 0);
361         if (omap_kp->irq) {
362                 if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
363                                 "omap-keypad", omap_kp) < 0)
364                         return -EINVAL;
365         }
366
367         device_create_file(&pdev->dev, &dev_attr_enable);
368
369         /* setup input device */
370         set_bit(EV_KEY, input_dev->evbit);
371         for (i = 0; keymap[i] != 0; i++)
372                 set_bit(keymap[i] & KEY_MAX, input_dev->keybit);
373         input_dev->name = "omap-keypad";
374         input_dev->cdev.dev = &pdev->dev;
375         input_dev->private = omap_kp;
376         input_register_device(omap_kp->input);
377
378         if (machine_is_omap_h2() || machine_is_omap_h3() ||
379             machine_is_omap_perseus2()) {
380                 omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);
381         }
382         /* scan current status and enable interrupt */
383         omap_kp_scan_keypad(omap_kp, keypad_state);
384         if (!cpu_is_omap24xx()) {
385                 omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
386         } else {
387                 for (i = 0; i < omap_kp->rows; i++) {
388                         if (request_irq(OMAP_GPIO_IRQ(row_gpios[i]), omap_kp_interrupt,
389                                         SA_TRIGGER_FALLING, "omap-keypad", omap_kp) < 0)
390                                 return -EINVAL;
391                 }
392         }
393
394         return 0;
395 }
396
397 static int omap_kp_remove(struct platform_device *pdev)
398 {
399         struct omap_kp *omap_kp = platform_get_drvdata(pdev);
400
401         /* disable keypad interrupt handling */
402         tasklet_disable(&kp_tasklet);
403         if (cpu_is_omap24xx()) {
404                 int i;
405                 for (i = 0; i < omap_kp->cols; i++)
406                         omap_free_gpio(col_gpios[i]);
407                 for (i = 0; i < omap_kp->rows; i++) {
408                         omap_free_gpio(row_gpios[i]);
409                         free_irq(OMAP_GPIO_IRQ(row_gpios[i]), 0);
410                 }
411         } else {
412                 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
413                 free_irq(omap_kp->irq, 0);
414         }
415
416         del_timer_sync(&omap_kp->timer);
417
418         /* unregister everything */
419         input_unregister_device(omap_kp->input);
420
421         kfree(omap_kp);
422
423         return 0;
424 }
425
426 static struct platform_driver omap_kp_driver = {
427         .probe          = omap_kp_probe,
428         .remove         = omap_kp_remove,
429         .suspend        = omap_kp_suspend,
430         .resume         = omap_kp_resume,
431         .driver         = {
432                 .name   = "omap-keypad",
433         },
434 };
435
436 static int __devinit omap_kp_init(void)
437 {
438         printk(KERN_INFO "OMAP Keypad Driver\n");
439         return platform_driver_register(&omap_kp_driver);
440 }
441
442 static void __exit omap_kp_exit(void)
443 {
444         platform_driver_unregister(&omap_kp_driver);
445 }
446
447 module_init(omap_kp_init);
448 module_exit(omap_kp_exit);
449
450 MODULE_AUTHOR("Timo Teräs");
451 MODULE_DESCRIPTION("OMAP Keypad Driver");
452 MODULE_LICENSE("GPL");