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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 
159                         if (!(kp_cur_group == (key & GROUP_MASK) ||
160                               kp_cur_group == -1))
161                                 continue;
162 
163                         kp_cur_group = key & GROUP_MASK;
164                         input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
165                                          new_state[col] & (1 << row));
166 #endif
167                 }
168         }
169         input_sync(omap_kp_data->input);
170         memcpy(keypad_state, new_state, sizeof(keypad_state));
171 
172         if (key_down) {
173                 int delay = HZ / 20;
174                 /* some key is pressed - keep irq disabled and use timer
175                  * to poll the keypad */
176                 if (spurious)
177                         delay = 2 * HZ;
178                 mod_timer(&omap_kp_data->timer, jiffies + delay);
179         } else {
180                 /* enable interrupts */
181                 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
182                 kp_cur_group = -1;
183         }
184 }
185 
186 static ssize_t omap_kp_enable_show(struct device *dev,
187                                    struct device_attribute *attr, char *buf)
188 {
189         return sprintf(buf, "%u\n", kp_enable);
190 }
191 
192 static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,
193                                     const char *buf, size_t count)
194 {
195         struct omap_kp *omap_kp = dev_get_drvdata(dev);
196         int state;
197 
198         if (sscanf(buf, "%u", &state) != 1)
199                 return -EINVAL;
200 
201         if ((state != 1) && (state != 0))
202                 return -EINVAL;
203 
204         mutex_lock(&kp_enable_mutex);
205         if (state != kp_enable) {
206                 if (state)
207                         enable_irq(omap_kp->irq);
208                 else
209                         disable_irq(omap_kp->irq);
210                 kp_enable = state;
211         }
212         mutex_unlock(&kp_enable_mutex);
213 
214         return strnlen(buf, count);
215 }
216 
217 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);
218 
219 #ifdef CONFIG_PM
220 static int omap_kp_suspend(struct platform_device *dev, pm_message_t state)
221 {
222         /* Nothing yet */
223 
224         return 0;
225 }
226 
227 static int omap_kp_resume(struct platform_device *dev)
228 {
229         /* Nothing yet */
230 
231         return 0;
232 }
233 #else
234 #define omap_kp_suspend NULL
235 #define omap_kp_resume  NULL
236 #endif
237 
238 static int omap_kp_probe(struct platform_device *pdev)
239 {
240         struct omap_kp *omap_kp;
241         struct input_dev *input_dev;
242         struct omap_kp_platform_data *pdata = dev_get_platdata(&pdev->dev);
243         int i, col_idx, row_idx, ret;
244         unsigned int row_shift, keycodemax;
245 
246         if (!pdata->rows || !pdata->cols || !pdata->keymap_data) {
247                 printk(KERN_ERR "No rows, cols or keymap_data from pdata\n");
248                 return -EINVAL;
249         }
250 
251         row_shift = get_count_order(pdata->cols);
252         keycodemax = pdata->rows << row_shift;
253 
254         omap_kp = kzalloc(sizeof(struct omap_kp) +
255                         keycodemax * sizeof(unsigned short), GFP_KERNEL);
256         input_dev = input_allocate_device();
257         if (!omap_kp || !input_dev) {
258                 kfree(omap_kp);
259                 input_free_device(input_dev);
260                 return -ENOMEM;
261         }
262 
263         platform_set_drvdata(pdev, omap_kp);
264 
265         omap_kp->input = input_dev;
266 
267         /* Disable the interrupt for the MPUIO keyboard */
268         omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
269 
270         if (pdata->delay)
271                 omap_kp->delay = pdata->delay;
272 
273         if (pdata->row_gpios && pdata->col_gpios) {
274                 row_gpios = pdata->row_gpios;
275                 col_gpios = pdata->col_gpios;
276         }
277 
278         omap_kp->rows = pdata->rows;
279         omap_kp->cols = pdata->cols;
280 
281         col_idx = 0;
282         row_idx = 0;
283 
284         setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp);
285 
286         /* get the irq and init timer*/
287         kp_tasklet.data = (unsigned long) omap_kp;
288         tasklet_enable(&kp_tasklet);
289 
290         ret = device_create_file(&pdev->dev, &dev_attr_enable);
291         if (ret < 0)
292                 goto err2;
293 
294         /* setup input device */
295         input_dev->name = "omap-keypad";
296         input_dev->phys = "omap-keypad/input0";
297         input_dev->dev.parent = &pdev->dev;
298 
299         input_dev->id.bustype = BUS_HOST;
300         input_dev->id.vendor = 0x0001;
301         input_dev->id.product = 0x0001;
302         input_dev->id.version = 0x0100;
303 
304         if (pdata->rep)
305                 __set_bit(EV_REP, input_dev->evbit);
306 
307         ret = matrix_keypad_build_keymap(pdata->keymap_data, NULL,
308                                          pdata->rows, pdata->cols,
309                                          omap_kp->keymap, input_dev);
310         if (ret < 0)
311                 goto err3;
312 
313         ret = input_register_device(omap_kp->input);
314         if (ret < 0) {
315                 printk(KERN_ERR "Unable to register omap-keypad input device\n");
316                 goto err3;
317         }
318 
319         if (pdata->dbounce)
320                 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);
321 
322         /* scan current status and enable interrupt */
323         omap_kp_scan_keypad(omap_kp, keypad_state);
324         omap_kp->irq = platform_get_irq(pdev, 0);
325         if (omap_kp->irq >= 0) {
326                 if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
327                                 "omap-keypad", omap_kp) < 0)
328                         goto err4;
329         }
330         omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
331 
332         return 0;
333 
334 err4:
335         input_unregister_device(omap_kp->input);
336         input_dev = NULL;
337 err3:
338         device_remove_file(&pdev->dev, &dev_attr_enable);
339 err2:
340         for (i = row_idx - 1; i >= 0; i--)
341                 gpio_free(row_gpios[i]);
342         for (i = col_idx - 1; i >= 0; i--)
343                 gpio_free(col_gpios[i]);
344 
345         kfree(omap_kp);
346         input_free_device(input_dev);
347 
348         return -EINVAL;
349 }
350 
351 static int omap_kp_remove(struct platform_device *pdev)
352 {
353         struct omap_kp *omap_kp = platform_get_drvdata(pdev);
354 
355         /* disable keypad interrupt handling */
356         tasklet_disable(&kp_tasklet);
357         omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
358         free_irq(omap_kp->irq, omap_kp);
359 
360         del_timer_sync(&omap_kp->timer);
361         tasklet_kill(&kp_tasklet);
362 
363         /* unregister everything */
364         input_unregister_device(omap_kp->input);
365 
366         kfree(omap_kp);
367 
368         return 0;
369 }
370 
371 static struct platform_driver omap_kp_driver = {
372         .probe          = omap_kp_probe,
373         .remove         = omap_kp_remove,
374         .suspend        = omap_kp_suspend,
375         .resume         = omap_kp_resume,
376         .driver         = {
377                 .name   = "omap-keypad",
378         },
379 };
380 module_platform_driver(omap_kp_driver);
381 
382 MODULE_AUTHOR("Timo Teräs");
383 MODULE_DESCRIPTION("OMAP Keypad Driver");
384 MODULE_LICENSE("GPL");
385 MODULE_ALIAS("platform:omap-keypad");
386 

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