drivers/input/keyboard/aaed2000_kbd.c

   1 /*
   2  *  Keyboard driver for the AAED-2000 dev board
   3  *
   4  *  Copyright (c) 2006 Nicolas Bellido Y Ortega
   5  *
   6  *  Based on corgikbd.c
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License version 2 as
  10  *  published by the Free Software Foundation.
  11  *
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/init.h>
  17 #include <linux/input-polldev.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/jiffies.h>
  20 #include <linux/module.h>
  21 #include <linux/slab.h>
  22
  23 #include <asm/arch/hardware.h>
  24 #include <asm/arch/aaed2000.h>
  25
  26 #define KB_ROWS                 12
  27 #define KB_COLS                 8
  28 #define KB_ROWMASK(r)           (1 << (r))
  29 #define SCANCODE(r,c)           (((c) * KB_ROWS) + (r))
  30 #define NR_SCANCODES            (KB_COLS * KB_ROWS)
  31
  32 #define SCAN_INTERVAL           (50) /* ms */
  33 #define KB_ACTIVATE_DELAY       (20) /* us */
  34
  35 static unsigned char aaedkbd_keycode[NR_SCANCODES] = {
  36         KEY_9, KEY_0, KEY_MINUS, KEY_EQUAL, KEY_BACKSPACE, 0, KEY_SPACE, KEY_KP6, 0, KEY_KPDOT, 0, 0,
  37         KEY_K, KEY_M, KEY_O, KEY_DOT, KEY_SLASH, 0, KEY_F, 0, 0, 0, KEY_LEFTSHIFT, 0,
  38         KEY_I, KEY_P, KEY_LEFTBRACE, KEY_RIGHTBRACE, KEY_BACKSLASH, 0, 0, 0, 0, 0, KEY_RIGHTSHIFT, 0,
  39         KEY_8, KEY_L, KEY_SEMICOLON, KEY_APOSTROPHE, KEY_ENTER, 0, 0, 0, 0, 0, 0, 0,
  40         KEY_J, KEY_H, KEY_B, KEY_KP8, KEY_KP4, 0, KEY_C, KEY_D, KEY_S, KEY_A, 0, KEY_CAPSLOCK,
  41         KEY_Y, KEY_U, KEY_N, KEY_T, 0, 0, KEY_R, KEY_E, KEY_W, KEY_Q, 0, KEY_TAB,
  42         KEY_7, KEY_6, KEY_G, 0, KEY_5, 0, KEY_4, KEY_3, KEY_2, KEY_1, 0, KEY_GRAVE,
  43         0, 0, KEY_COMMA, 0, KEY_KP2, 0, KEY_V, KEY_LEFTALT, KEY_X, KEY_Z, 0, KEY_LEFTCTRL
  44 };
  45
  46 struct aaedkbd {
  47         unsigned char keycode[ARRAY_SIZE(aaedkbd_keycode)];
  48         struct input_polled_dev *poll_dev;
  49         int kbdscan_state[KB_COLS];
  50         int kbdscan_count[KB_COLS];
  51 };
  52
  53 #define KBDSCAN_STABLE_COUNT 2
  54
  55 static void aaedkbd_report_col(struct aaedkbd *aaedkbd,
  56                                 unsigned int col, unsigned int rowd)
  57 {
  58         unsigned int scancode, pressed;
  59         unsigned int row;
  60
  61         for (row = 0; row < KB_ROWS; row++) {
  62                 scancode = SCANCODE(row, col);
  63                 pressed = rowd & KB_ROWMASK(row);
  64
  65                 input_report_key(aaedkbd->poll_dev->input,
  66                                  aaedkbd->keycode[scancode], pressed);
  67         }
  68 }
  69
  70 /* Scan the hardware keyboard and push any changes up through the input layer */
  71 static void aaedkbd_poll(struct input_polled_dev *dev)
  72 {
  73         struct aaedkbd *aaedkbd = dev->private;
  74         unsigned int col, rowd;
  75
  76         col = 0;
  77         do {
  78                 AAEC_GPIO_KSCAN = col + 8;
  79                 udelay(KB_ACTIVATE_DELAY);
  80                 rowd = AAED_EXT_GPIO & AAED_EGPIO_KBD_SCAN;
  81
  82                 if (rowd != aaedkbd->kbdscan_state[col]) {
  83                         aaedkbd->kbdscan_count[col] = 0;
  84                         aaedkbd->kbdscan_state[col] = rowd;
  85                 } else if (++aaedkbd->kbdscan_count[col] >= KBDSCAN_STABLE_COUNT) {
  86                         aaedkbd_report_col(aaedkbd, col, rowd);
  87                         col++;
  88                 }
  89         } while (col < KB_COLS);
  90
  91         AAEC_GPIO_KSCAN = 0x07;
  92         input_sync(dev->input);
  93 }
  94
  95 static int __devinit aaedkbd_probe(struct platform_device *pdev)
  96 {
  97         struct aaedkbd *aaedkbd;
  98         struct input_polled_dev *poll_dev;
  99         struct input_dev *input_dev;
 100         int i;
 101         int error;
 102
 103         aaedkbd = kzalloc(sizeof(struct aaedkbd), GFP_KERNEL);
 104         poll_dev = input_allocate_polled_device();
 105         if (!aaedkbd || !poll_dev) {
 106                 error = -ENOMEM;
 107                 goto fail;
 108         }
 109
 110         platform_set_drvdata(pdev, aaedkbd);
 111
 112         aaedkbd->poll_dev = poll_dev;
 113         memcpy(aaedkbd->keycode, aaedkbd_keycode, sizeof(aaedkbd->keycode));
 114
 115         poll_dev->private = aaedkbd;
 116         poll_dev->poll = aaedkbd_poll;
 117         poll_dev->poll_interval = SCAN_INTERVAL;
 118
 119         input_dev = poll_dev->input;
 120         input_dev->name = "AAED-2000 Keyboard";
 121         input_dev->phys = "aaedkbd/input0";
 122         input_dev->id.bustype = BUS_HOST;
 123         input_dev->id.vendor = 0x0001;
 124         input_dev->id.product = 0x0001;
 125         input_dev->id.version = 0x0100;
 126         input_dev->dev.parent = &pdev->dev;
 127
 128         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
 129         input_dev->keycode = aaedkbd->keycode;
 130         input_dev->keycodesize = sizeof(unsigned char);
 131         input_dev->keycodemax = ARRAY_SIZE(aaedkbd_keycode);
 132
 133         for (i = 0; i < ARRAY_SIZE(aaedkbd_keycode); i++)
 134                 set_bit(aaedkbd->keycode[i], input_dev->keybit);
 135         clear_bit(0, input_dev->keybit);
 136
 137         error = input_register_polled_device(aaedkbd->poll_dev);
 138         if (error)
 139                 goto fail;
 140
 141         return 0;
 142
 143  fail:  kfree(aaedkbd);
 144         input_free_polled_device(poll_dev);
 145         return error;
 146 }
 147
 148 static int __devexit aaedkbd_remove(struct platform_device *pdev)
 149 {
 150         struct aaedkbd *aaedkbd = platform_get_drvdata(pdev);
 151
 152         input_unregister_polled_device(aaedkbd->poll_dev);
 153         input_free_polled_device(aaedkbd->poll_dev);
 154         kfree(aaedkbd);
 155
 156         return 0;
 157 }
 158
 159 /* work with hotplug and coldplug */
 160 MODULE_ALIAS("platform:aaed2000-keyboard");
 161
 162 static struct platform_driver aaedkbd_driver = {
 163         .probe          = aaedkbd_probe,
 164         .remove         = __devexit_p(aaedkbd_remove),
 165         .driver         = {
 166                 .name   = "aaed2000-keyboard",
 167                 .owner  = THIS_MODULE,
 168         },
 169 };
 170
 171 static int __init aaedkbd_init(void)
 172 {
 173         return platform_driver_register(&aaedkbd_driver);
 174 }
 175
 176 static void __exit aaedkbd_exit(void)
 177 {
 178         platform_driver_unregister(&aaedkbd_driver);
 179 }
 180
 181 module_init(aaedkbd_init);
 182 module_exit(aaedkbd_exit);
 183
 184 MODULE_AUTHOR("Nicolas Bellido Y Ortega");
 185 MODULE_DESCRIPTION("AAED-2000 Keyboard Driver");
 186 MODULE_LICENSE("GPL v2");