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.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/jiffies.h>
  20 #include <linux/module.h>
  21 #include <linux/slab.h>
  22 #include <linux/workqueue.h>
  23
  24 #include <asm/arch/hardware.h>
  25 #include <asm/arch/aaed2000.h>
  26
  27 #define KB_ROWS                 12
  28 #define KB_COLS                 8
  29 #define KB_ROWMASK(r)           (1 << (r))
  30 #define SCANCODE(r,c)           (((c) * KB_ROWS) + (r))
  31 #define NR_SCANCODES            (KB_COLS * KB_ROWS)
  32
  33 #define SCAN_INTERVAL           (50) /* ms */
  34 #define KB_ACTIVATE_DELAY       (20) /* us */
  35
  36 static unsigned char aaedkbd_keycode[NR_SCANCODES] = {
  37         KEY_9, KEY_0, KEY_MINUS, KEY_EQUAL, KEY_BACKSPACE, 0, KEY_SPACE, KEY_KP6, 0, KEY_KPDOT, 0, 0,
  38         KEY_K, KEY_M, KEY_O, KEY_DOT, KEY_SLASH, 0, KEY_F, 0, 0, 0, KEY_LEFTSHIFT, 0,
  39         KEY_I, KEY_P, KEY_LEFTBRACE, KEY_RIGHTBRACE, KEY_BACKSLASH, 0, 0, 0, 0, 0, KEY_RIGHTSHIFT, 0,
  40         KEY_8, KEY_L, KEY_SEMICOLON, KEY_APOSTROPHE, KEY_ENTER, 0, 0, 0, 0, 0, 0, 0,
  41         KEY_J, KEY_H, KEY_B, KEY_KP8, KEY_KP4, 0, KEY_C, KEY_D, KEY_S, KEY_A, 0, KEY_CAPSLOCK,
  42         KEY_Y, KEY_U, KEY_N, KEY_T, 0, 0, KEY_R, KEY_E, KEY_W, KEY_Q, 0, KEY_TAB,
  43         KEY_7, KEY_6, KEY_G, 0, KEY_5, 0, KEY_4, KEY_3, KEY_2, KEY_1, 0, KEY_GRAVE,
  44         0, 0, KEY_COMMA, 0, KEY_KP2, 0, KEY_V, KEY_LEFTALT, KEY_X, KEY_Z, 0, KEY_LEFTCTRL
  45 };
  46
  47 struct aaedkbd {
  48         unsigned char keycode[ARRAY_SIZE(aaedkbd_keycode)];
  49         struct input_dev *input;
  50         struct work_struct workq;
  51         int kbdscan_state[KB_COLS];
  52         int kbdscan_count[KB_COLS];
  53 };
  54
  55 #define KBDSCAN_STABLE_COUNT 2
  56
  57 static void aaedkbd_report_col(struct aaedkbd *aaedkbd,
  58                                 unsigned int col, unsigned int rowd)
  59 {
  60         unsigned int scancode, pressed;
  61         unsigned int row;
  62
  63         for (row = 0; row < KB_ROWS; row++) {
  64                 scancode = SCANCODE(row, col);
  65                 pressed = rowd & KB_ROWMASK(row);
  66
  67                 input_report_key(aaedkbd->input, aaedkbd->keycode[scancode], pressed);
  68         }
  69 }
  70
  71 /* Scan the hardware keyboard and push any changes up through the input layer */
  72 static void aaedkbd_work(void *data)
  73 {
  74         struct aaedkbd *aaedkbd = data;
  75         unsigned int col, rowd;
  76
  77         col = 0;
  78         do {
  79                 AAEC_GPIO_KSCAN = col + 8;
  80                 udelay(KB_ACTIVATE_DELAY);
  81                 rowd = AAED_EXT_GPIO & AAED_EGPIO_KBD_SCAN;
  82
  83                 if (rowd != aaedkbd->kbdscan_state[col]) {
  84                         aaedkbd->kbdscan_count[col] = 0;
  85                         aaedkbd->kbdscan_state[col] = rowd;
  86                 } else if (++aaedkbd->kbdscan_count[col] >= KBDSCAN_STABLE_COUNT) {
  87                         aaedkbd_report_col(aaedkbd, col, rowd);
  88                         col++;
  89                 }
  90         } while (col < KB_COLS);
  91
  92         AAEC_GPIO_KSCAN = 0x07;
  93         input_sync(aaedkbd->input);
  94
  95         schedule_delayed_work(&aaedkbd->workq, msecs_to_jiffies(SCAN_INTERVAL));
  96 }
  97
  98 static int aaedkbd_open(struct input_dev *indev)
  99 {
 100         struct aaedkbd *aaedkbd = indev->private;
 101
 102         schedule_delayed_work(&aaedkbd->workq, msecs_to_jiffies(SCAN_INTERVAL));
 103
 104         return 0;
 105 }
 106
 107 static void aaedkbd_close(struct input_dev *indev)
 108 {
 109         struct aaedkbd *aaedkbd = indev->private;
 110
 111         cancel_delayed_work(&aaedkbd->workq);
 112         flush_scheduled_work();
 113 }
 114
 115 static int __devinit aaedkbd_probe(struct platform_device *pdev)
 116 {
 117         struct aaedkbd *aaedkbd;
 118         struct input_dev *input_dev;
 119         int i;
 120         int error;
 121
 122         aaedkbd = kzalloc(sizeof(struct aaedkbd), GFP_KERNEL);
 123         input_dev = input_allocate_device();
 124         if (!aaedkbd || !input_dev) {
 125                 error = -ENOMEM;
 126                 goto fail;
 127         }
 128
 129         platform_set_drvdata(pdev, aaedkbd);
 130
 131         aaedkbd->input = input_dev;
 132
 133         /* Init keyboard rescan workqueue */
 134         INIT_WORK(&aaedkbd->workq, aaedkbd_work, aaedkbd);
 135
 136         memcpy(aaedkbd->keycode, aaedkbd_keycode, sizeof(aaedkbd->keycode));
 137
 138         input_dev->name = "AAED-2000 Keyboard";
 139         input_dev->phys = "aaedkbd/input0";
 140         input_dev->id.bustype = BUS_HOST;
 141         input_dev->id.vendor = 0x0001;
 142         input_dev->id.product = 0x0001;
 143         input_dev->id.version = 0x0100;
 144         input_dev->cdev.dev = &pdev->dev;
 145         input_dev->private = aaedkbd;
 146
 147         input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP);
 148         input_dev->keycode = aaedkbd->keycode;
 149         input_dev->keycodesize = sizeof(unsigned char);
 150         input_dev->keycodemax = ARRAY_SIZE(aaedkbd_keycode);
 151
 152         for (i = 0; i < ARRAY_SIZE(aaedkbd_keycode); i++)
 153                 set_bit(aaedkbd->keycode[i], input_dev->keybit);
 154         clear_bit(0, input_dev->keybit);
 155
 156         input_dev->open = aaedkbd_open;
 157         input_dev->close = aaedkbd_close;
 158
 159         error = input_register_device(aaedkbd->input);
 160         if (error)
 161                 goto fail;
 162
 163         return 0;
 164
 165  fail:  kfree(aaedkbd);
 166         input_free_device(input_dev);
 167         return error;
 168 }
 169
 170 static int __devexit aaedkbd_remove(struct platform_device *pdev)
 171 {
 172         struct aaedkbd *aaedkbd = platform_get_drvdata(pdev);
 173
 174         input_unregister_device(aaedkbd->input);
 175         kfree(aaedkbd);
 176
 177         return 0;
 178 }
 179
 180 static struct platform_driver aaedkbd_driver = {
 181         .probe          = aaedkbd_probe,
 182         .remove         = __devexit_p(aaedkbd_remove),
 183         .driver         = {
 184                 .name   = "aaed2000-keyboard",
 185         },
 186 };
 187
 188 static int __init aaedkbd_init(void)
 189 {
 190         return platform_driver_register(&aaedkbd_driver);
 191 }
 192
 193 static void __exit aaedkbd_exit(void)
 194 {
 195         platform_driver_unregister(&aaedkbd_driver);
 196 }
 197
 198 module_init(aaedkbd_init);
 199 module_exit(aaedkbd_exit);
 200
 201 MODULE_AUTHOR("Nicolas Bellido Y Ortega");
 202 MODULE_DESCRIPTION("AAED-2000 Keyboard Driver");
 203 MODULE_LICENSE("GPLv2");