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Linux/drivers/input/keyboard/omap-keypad.c

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

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