?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
tracing/kprobes: Support soft-mode disabling
[linux-2.6.git] / drivers / input / keyboard / omap-keypad.c
blobd0d5226d9cd4981398997d60db6b01949bc0030a
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 <linux/gpio.h>
39 #include <linux/platform_data/gpio-omap.h>
40 #include <linux/platform_data/keypad-omap.h>
41
42 #undef NEW_BOARD_LEARNING_MODE
43
44 static void omap_kp_tasklet(unsigned long);
45 static void omap_kp_timer(unsigned long);
46
47 static unsigned char keypad_state[8];
48 static DEFINE_MUTEX(kp_enable_mutex);
49 static int kp_enable = 1;
50 static int kp_cur_group = -1;
51
52 struct omap_kp {
53 struct input_dev *input;
54 struct timer_list timer;
55 int irq;
56 unsigned int rows;
57 unsigned int cols;
58 unsigned long delay;
59 unsigned int debounce;
60 unsigned short keymap[];
61 };
62
63 static DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0);
64
65 static unsigned int *row_gpios;
66 static unsigned int *col_gpios;
67
68 #ifdef CONFIG_ARCH_OMAP2
69 static void set_col_gpio_val(struct omap_kp *omap_kp, u8 value)
70 {
71 int col;
72
73 for (col = 0; col < omap_kp->cols; col++)
74 gpio_set_value(col_gpios[col], value & (1 << col));
75 }
76
77 static u8 get_row_gpio_val(struct omap_kp *omap_kp)
78 {
79 int row;
80 u8 value = 0;
81
82 for (row = 0; row < omap_kp->rows; row++) {
83 if (gpio_get_value(row_gpios[row]))
84 value |= (1 << row);
85 }
86 return value;
87 }
88 #else
89 #define set_col_gpio_val(x, y) do {} while (0)
90 #define get_row_gpio_val(x) 0
91 #endif
92
93 static irqreturn_t omap_kp_interrupt(int irq, void *dev_id)
94 {
95 /* disable keyboard interrupt and schedule for handling */
96 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
97
98 tasklet_schedule(&kp_tasklet);
99
100 return IRQ_HANDLED;
101 }
102
103 static void omap_kp_timer(unsigned long data)
104 {
105 tasklet_schedule(&kp_tasklet);
106 }
107
108 static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state)
109 {
110 int col = 0;
111
112 /* disable keyboard interrupt and schedule for handling */
113 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
114
115 /* read the keypad status */
116 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
117 for (col = 0; col < omap_kp->cols; col++) {
118 omap_writew(~(1 << col) & 0xff,
119 OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
120
121 udelay(omap_kp->delay);
122
123 state[col] = ~omap_readw(OMAP1_MPUIO_BASE +
124 OMAP_MPUIO_KBR_LATCH) & 0xff;
125 }
126 omap_writew(0x00, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
127 udelay(2);
128 }
129
130 static void omap_kp_tasklet(unsigned long data)
131 {
132 struct omap_kp *omap_kp_data = (struct omap_kp *) data;
133 unsigned short *keycodes = omap_kp_data->input->keycode;
134 unsigned int row_shift = get_count_order(omap_kp_data->cols);
135 unsigned char new_state[8], changed, key_down = 0;
136 int col, row;
137 int spurious = 0;
138
139 /* check for any changes */
140 omap_kp_scan_keypad(omap_kp_data, new_state);
141
142 /* check for changes and print those */
143 for (col = 0; col < omap_kp_data->cols; col++) {
144 changed = new_state[col] ^ keypad_state[col];
145 key_down |= new_state[col];
146 if (changed == 0)
147 continue;
148
149 for (row = 0; row < omap_kp_data->rows; row++) {
150 int key;
151 if (!(changed & (1 << row)))
152 continue;
153 #ifdef NEW_BOARD_LEARNING_MODE
154 printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col,
155 row, (new_state[col] & (1 << row)) ?
156 "pressed" : "released");
157 #else
158 key = keycodes[MATRIX_SCAN_CODE(row, col, row_shift)];
159 if (key < 0) {
160 printk(KERN_WARNING
161 "omap-keypad: Spurious key event %d-%d\n",
162 col, row);
163 /* We scan again after a couple of seconds */
164 spurious = 1;
165 continue;
166 }
167
168 if (!(kp_cur_group == (key & GROUP_MASK) ||
169 kp_cur_group == -1))
170 continue;
171
172 kp_cur_group = key & GROUP_MASK;
173 input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
174 new_state[col] & (1 << row));
175 #endif
176 }
177 }
178 input_sync(omap_kp_data->input);
179 memcpy(keypad_state, new_state, sizeof(keypad_state));
180
181 if (key_down) {
182 int delay = HZ / 20;
183 /* some key is pressed - keep irq disabled and use timer
184 * to poll the keypad */
185 if (spurious)
186 delay = 2 * HZ;
187 mod_timer(&omap_kp_data->timer, jiffies + delay);
188 } else {
189 /* enable interrupts */
190 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
191 kp_cur_group = -1;
192 }
193 }
194
195 static ssize_t omap_kp_enable_show(struct device *dev,
196 struct device_attribute *attr, char *buf)
197 {
198 return sprintf(buf, "%u\n", kp_enable);
199 }
200
201 static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,
202 const char *buf, size_t count)
203 {
204 struct omap_kp *omap_kp = dev_get_drvdata(dev);
205 int state;
206
207 if (sscanf(buf, "%u", &state) != 1)
208 return -EINVAL;
209
210 if ((state != 1) && (state != 0))
211 return -EINVAL;
212
213 mutex_lock(&kp_enable_mutex);
214 if (state != kp_enable) {
215 if (state)
216 enable_irq(omap_kp->irq);
217 else
218 disable_irq(omap_kp->irq);
219 kp_enable = state;
220 }
221 mutex_unlock(&kp_enable_mutex);
222
223 return strnlen(buf, count);
224 }
225
226 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);
227
228 #ifdef CONFIG_PM
229 static int omap_kp_suspend(struct platform_device *dev, pm_message_t state)
230 {
231 /* Nothing yet */
232
233 return 0;
234 }
235
236 static int omap_kp_resume(struct platform_device *dev)
237 {
238 /* Nothing yet */
239
240 return 0;
241 }
242 #else
243 #define omap_kp_suspend NULL
244 #define omap_kp_resume NULL
245 #endif
246
247 static int omap_kp_probe(struct platform_device *pdev)
248 {
249 struct omap_kp *omap_kp;
250 struct input_dev *input_dev;
251 struct omap_kp_platform_data *pdata = pdev->dev.platform_data;
252 int i, col_idx, row_idx, ret;
253 unsigned int row_shift, keycodemax;
254
255 if (!pdata->rows || !pdata->cols || !pdata->keymap_data) {
256 printk(KERN_ERR "No rows, cols or keymap_data from pdata\n");
257 return -EINVAL;
258 }
259
260 row_shift = get_count_order(pdata->cols);
261 keycodemax = pdata->rows << row_shift;
262
263 omap_kp = kzalloc(sizeof(struct omap_kp) +
264 keycodemax * sizeof(unsigned short), GFP_KERNEL);
265 input_dev = input_allocate_device();
266 if (!omap_kp || !input_dev) {
267 kfree(omap_kp);
268 input_free_device(input_dev);
269 return -ENOMEM;
270 }
271
272 platform_set_drvdata(pdev, omap_kp);
273
274 omap_kp->input = input_dev;
275
276 /* Disable the interrupt for the MPUIO keyboard */
277 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
278
279 if (pdata->delay)
280 omap_kp->delay = pdata->delay;
281
282 if (pdata->row_gpios && pdata->col_gpios) {
283 row_gpios = pdata->row_gpios;
284 col_gpios = pdata->col_gpios;
285 }
286
287 omap_kp->rows = pdata->rows;
288 omap_kp->cols = pdata->cols;
289
290 col_idx = 0;
291 row_idx = 0;
292
293 setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp);
294
295 /* get the irq and init timer*/
296 tasklet_enable(&kp_tasklet);
297 kp_tasklet.data = (unsigned long) omap_kp;
298
299 ret = device_create_file(&pdev->dev, &dev_attr_enable);
300 if (ret < 0)
301 goto err2;
302
303 /* setup input device */
304 input_dev->name = "omap-keypad";
305 input_dev->phys = "omap-keypad/input0";
306 input_dev->dev.parent = &pdev->dev;
307
308 input_dev->id.bustype = BUS_HOST;
309 input_dev->id.vendor = 0x0001;
310 input_dev->id.product = 0x0001;
311 input_dev->id.version = 0x0100;
312
313 if (pdata->rep)
314 __set_bit(EV_REP, input_dev->evbit);
315
316 ret = matrix_keypad_build_keymap(pdata->keymap_data, NULL,
317 pdata->rows, pdata->cols,
318 omap_kp->keymap, input_dev);
319 if (ret < 0)
320 goto err3;
321
322 ret = input_register_device(omap_kp->input);
323 if (ret < 0) {
324 printk(KERN_ERR "Unable to register omap-keypad input device\n");
325 goto err3;
326 }
327
328 if (pdata->dbounce)
329 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);
330
331 /* scan current status and enable interrupt */
332 omap_kp_scan_keypad(omap_kp, keypad_state);
333 omap_kp->irq = platform_get_irq(pdev, 0);
334 if (omap_kp->irq >= 0) {
335 if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
336 "omap-keypad", omap_kp) < 0)
337 goto err4;
338 }
339 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
340
341 return 0;
342
343 err4:
344 input_unregister_device(omap_kp->input);
345 input_dev = NULL;
346 err3:
347 device_remove_file(&pdev->dev, &dev_attr_enable);
348 err2:
349 for (i = row_idx - 1; i >= 0; i--)
350 gpio_free(row_gpios[i]);
351 for (i = col_idx - 1; i >= 0; i--)
352 gpio_free(col_gpios[i]);
353
354 kfree(omap_kp);
355 input_free_device(input_dev);
356
357 return -EINVAL;
358 }
359
360 static int omap_kp_remove(struct platform_device *pdev)
361 {
362 struct omap_kp *omap_kp = platform_get_drvdata(pdev);
363
364 /* disable keypad interrupt handling */
365 tasklet_disable(&kp_tasklet);
366 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
367 free_irq(omap_kp->irq, omap_kp);
368
369 del_timer_sync(&omap_kp->timer);
370 tasklet_kill(&kp_tasklet);
371
372 /* unregister everything */
373 input_unregister_device(omap_kp->input);
374
375 kfree(omap_kp);
376
377 return 0;
378 }
379
380 static struct platform_driver omap_kp_driver = {
381 .probe = omap_kp_probe,
382 .remove = omap_kp_remove,
383 .suspend = omap_kp_suspend,
384 .resume = omap_kp_resume,
385 .driver = {
386 .name = "omap-keypad",
387 .owner = THIS_MODULE,
388 },
389 };
390 module_platform_driver(omap_kp_driver);
391
392 MODULE_AUTHOR("Timo Teräs");
393 MODULE_DESCRIPTION("OMAP Keypad Driver");
394 MODULE_LICENSE("GPL");
395 MODULE_ALIAS("platform:omap-keypad");
Linus' kernel tree