Version:  2.0.40 2.2.26 2.4.37 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7

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 static irqreturn_t omap_kp_interrupt(int irq, void *dev_id)
 68 {
 69         /* disable keyboard interrupt and schedule for handling */
 70         omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 71 
 72         tasklet_schedule(&kp_tasklet);
 73 
 74         return IRQ_HANDLED;
 75 }
 76 
 77 static void omap_kp_timer(unsigned long data)
 78 {
 79         tasklet_schedule(&kp_tasklet);
 80 }
 81 
 82 static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state)
 83 {
 84         int col = 0;
 85 
 86         /* disable keyboard interrupt and schedule for handling */
 87         omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 88 
 89         /* read the keypad status */
 90         omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
 91         for (col = 0; col < omap_kp->cols; col++) {
 92                 omap_writew(~(1 << col) & 0xff,
 93                             OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
 94 
 95                 udelay(omap_kp->delay);
 96 
 97                 state[col] = ~omap_readw(OMAP1_MPUIO_BASE +
 98                                          OMAP_MPUIO_KBR_LATCH) & 0xff;
 99         }
100         omap_writew(0x00, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
101         udelay(2);
102 }
103 
104 static void omap_kp_tasklet(unsigned long data)
105 {
106         struct omap_kp *omap_kp_data = (struct omap_kp *) data;
107         unsigned short *keycodes = omap_kp_data->input->keycode;
108         unsigned int row_shift = get_count_order(omap_kp_data->cols);
109         unsigned char new_state[8], changed, key_down = 0;
110         int col, row;
111 
112         /* check for any changes */
113         omap_kp_scan_keypad(omap_kp_data, new_state);
114 
115         /* check for changes and print those */
116         for (col = 0; col < omap_kp_data->cols; col++) {
117                 changed = new_state[col] ^ keypad_state[col];
118                 key_down |= new_state[col];
119                 if (changed == 0)
120                         continue;
121 
122                 for (row = 0; row < omap_kp_data->rows; row++) {
123                         int key;
124                         if (!(changed & (1 << row)))
125                                 continue;
126 #ifdef NEW_BOARD_LEARNING_MODE
127                         printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col,
128                                row, (new_state[col] & (1 << row)) ?
129                                "pressed" : "released");
130 #else
131                         key = keycodes[MATRIX_SCAN_CODE(row, col, row_shift)];
132 
133                         if (!(kp_cur_group == (key & GROUP_MASK) ||
134                               kp_cur_group == -1))
135                                 continue;
136 
137                         kp_cur_group = key & GROUP_MASK;
138                         input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
139                                          new_state[col] & (1 << row));
140 #endif
141                 }
142         }
143         input_sync(omap_kp_data->input);
144         memcpy(keypad_state, new_state, sizeof(keypad_state));
145 
146         if (key_down) {
147                 /* some key is pressed - keep irq disabled and use timer
148                  * to poll the keypad */
149                 mod_timer(&omap_kp_data->timer, jiffies + HZ / 20);
150         } else {
151                 /* enable interrupts */
152                 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
153                 kp_cur_group = -1;
154         }
155 }
156 
157 static ssize_t omap_kp_enable_show(struct device *dev,
158                                    struct device_attribute *attr, char *buf)
159 {
160         return sprintf(buf, "%u\n", kp_enable);
161 }
162 
163 static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,
164                                     const char *buf, size_t count)
165 {
166         struct omap_kp *omap_kp = dev_get_drvdata(dev);
167         int state;
168 
169         if (sscanf(buf, "%u", &state) != 1)
170                 return -EINVAL;
171 
172         if ((state != 1) && (state != 0))
173                 return -EINVAL;
174 
175         mutex_lock(&kp_enable_mutex);
176         if (state != kp_enable) {
177                 if (state)
178                         enable_irq(omap_kp->irq);
179                 else
180                         disable_irq(omap_kp->irq);
181                 kp_enable = state;
182         }
183         mutex_unlock(&kp_enable_mutex);
184 
185         return strnlen(buf, count);
186 }
187 
188 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);
189 
190 static int omap_kp_probe(struct platform_device *pdev)
191 {
192         struct omap_kp *omap_kp;
193         struct input_dev *input_dev;
194         struct omap_kp_platform_data *pdata = dev_get_platdata(&pdev->dev);
195         int i, col_idx, row_idx, ret;
196         unsigned int row_shift, keycodemax;
197 
198         if (!pdata->rows || !pdata->cols || !pdata->keymap_data) {
199                 printk(KERN_ERR "No rows, cols or keymap_data from pdata\n");
200                 return -EINVAL;
201         }
202 
203         row_shift = get_count_order(pdata->cols);
204         keycodemax = pdata->rows << row_shift;
205 
206         omap_kp = kzalloc(sizeof(struct omap_kp) +
207                         keycodemax * sizeof(unsigned short), GFP_KERNEL);
208         input_dev = input_allocate_device();
209         if (!omap_kp || !input_dev) {
210                 kfree(omap_kp);
211                 input_free_device(input_dev);
212                 return -ENOMEM;
213         }
214 
215         platform_set_drvdata(pdev, omap_kp);
216 
217         omap_kp->input = input_dev;
218 
219         /* Disable the interrupt for the MPUIO keyboard */
220         omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
221 
222         if (pdata->delay)
223                 omap_kp->delay = pdata->delay;
224 
225         if (pdata->row_gpios && pdata->col_gpios) {
226                 row_gpios = pdata->row_gpios;
227                 col_gpios = pdata->col_gpios;
228         }
229 
230         omap_kp->rows = pdata->rows;
231         omap_kp->cols = pdata->cols;
232 
233         col_idx = 0;
234         row_idx = 0;
235 
236         setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp);
237 
238         /* get the irq and init timer*/
239         kp_tasklet.data = (unsigned long) omap_kp;
240         tasklet_enable(&kp_tasklet);
241 
242         ret = device_create_file(&pdev->dev, &dev_attr_enable);
243         if (ret < 0)
244                 goto err2;
245 
246         /* setup input device */
247         input_dev->name = "omap-keypad";
248         input_dev->phys = "omap-keypad/input0";
249         input_dev->dev.parent = &pdev->dev;
250 
251         input_dev->id.bustype = BUS_HOST;
252         input_dev->id.vendor = 0x0001;
253         input_dev->id.product = 0x0001;
254         input_dev->id.version = 0x0100;
255 
256         if (pdata->rep)
257                 __set_bit(EV_REP, input_dev->evbit);
258 
259         ret = matrix_keypad_build_keymap(pdata->keymap_data, NULL,
260                                          pdata->rows, pdata->cols,
261                                          omap_kp->keymap, input_dev);
262         if (ret < 0)
263                 goto err3;
264 
265         ret = input_register_device(omap_kp->input);
266         if (ret < 0) {
267                 printk(KERN_ERR "Unable to register omap-keypad input device\n");
268                 goto err3;
269         }
270 
271         if (pdata->dbounce)
272                 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);
273 
274         /* scan current status and enable interrupt */
275         omap_kp_scan_keypad(omap_kp, keypad_state);
276         omap_kp->irq = platform_get_irq(pdev, 0);
277         if (omap_kp->irq >= 0) {
278                 if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
279                                 "omap-keypad", omap_kp) < 0)
280                         goto err4;
281         }
282         omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
283 
284         return 0;
285 
286 err4:
287         input_unregister_device(omap_kp->input);
288         input_dev = NULL;
289 err3:
290         device_remove_file(&pdev->dev, &dev_attr_enable);
291 err2:
292         for (i = row_idx - 1; i >= 0; i--)
293                 gpio_free(row_gpios[i]);
294         for (i = col_idx - 1; i >= 0; i--)
295                 gpio_free(col_gpios[i]);
296 
297         kfree(omap_kp);
298         input_free_device(input_dev);
299 
300         return -EINVAL;
301 }
302 
303 static int omap_kp_remove(struct platform_device *pdev)
304 {
305         struct omap_kp *omap_kp = platform_get_drvdata(pdev);
306 
307         /* disable keypad interrupt handling */
308         tasklet_disable(&kp_tasklet);
309         omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
310         free_irq(omap_kp->irq, omap_kp);
311 
312         del_timer_sync(&omap_kp->timer);
313         tasklet_kill(&kp_tasklet);
314 
315         /* unregister everything */
316         input_unregister_device(omap_kp->input);
317 
318         kfree(omap_kp);
319 
320         return 0;
321 }
322 
323 static struct platform_driver omap_kp_driver = {
324         .probe          = omap_kp_probe,
325         .remove         = omap_kp_remove,
326         .driver         = {
327                 .name   = "omap-keypad",
328         },
329 };
330 module_platform_driver(omap_kp_driver);
331 
332 MODULE_AUTHOR("Timo Teräs");
333 MODULE_DESCRIPTION("OMAP Keypad Driver");
334 MODULE_LICENSE("GPL");
335 MODULE_ALIAS("platform:omap-keypad");
336 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us