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         },
 387 };
 388 module_platform_driver(omap_kp_driver);
 389
 390 MODULE_AUTHOR("Timo Teräs");
 391 MODULE_DESCRIPTION("OMAP Keypad Driver");
 392 MODULE_LICENSE("GPL");
 393 MODULE_ALIAS("platform:omap-keypad");