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");