2 * Keyboard driver for the AAED-2000 dev board
4 * Copyright (c) 2006 Nicolas Bellido Y Ortega
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.
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>
24 #include <asm/arch/hardware.h>
25 #include <asm/arch/aaed2000.h>
29 #define KB_ROWMASK(r) (1 << (r))
30 #define SCANCODE(r,c) (((c) * KB_ROWS) + (r))
31 #define NR_SCANCODES (KB_COLS * KB_ROWS)
33 #define SCAN_INTERVAL (50) /* ms */
34 #define KB_ACTIVATE_DELAY (20) /* us */
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
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];
55 #define KBDSCAN_STABLE_COUNT 2
57 static void aaedkbd_report_col(struct aaedkbd *aaedkbd,
58 unsigned int col, unsigned int rowd)
60 unsigned int scancode, pressed;
63 for (row = 0; row < KB_ROWS; row++) {
64 scancode = SCANCODE(row, col);
65 pressed = rowd & KB_ROWMASK(row);
67 input_report_key(aaedkbd->input, aaedkbd->keycode[scancode], pressed);
71 /* Scan the hardware keyboard and push any changes up through the input layer */
72 static void aaedkbd_work(void *data)
74 struct aaedkbd *aaedkbd = data;
75 unsigned int col, rowd;
79 AAEC_GPIO_KSCAN = col + 8;
80 udelay(KB_ACTIVATE_DELAY);
81 rowd = AAED_EXT_GPIO & AAED_EGPIO_KBD_SCAN;
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);
90 } while (col < KB_COLS);
92 AAEC_GPIO_KSCAN = 0x07;
93 input_sync(aaedkbd->input);
95 schedule_delayed_work(&aaedkbd->workq, msecs_to_jiffies(SCAN_INTERVAL));
98 static int aaedkbd_open(struct input_dev *indev)
100 struct aaedkbd *aaedkbd = indev->private;
102 schedule_delayed_work(&aaedkbd->workq, msecs_to_jiffies(SCAN_INTERVAL));
107 static void aaedkbd_close(struct input_dev *indev)
109 struct aaedkbd *aaedkbd = indev->private;
111 cancel_delayed_work(&aaedkbd->workq);
112 flush_scheduled_work();
115 static int __devinit aaedkbd_probe(struct platform_device *pdev)
117 struct aaedkbd *aaedkbd;
118 struct input_dev *input_dev;
122 aaedkbd = kzalloc(sizeof(struct aaedkbd), GFP_KERNEL);
123 input_dev = input_allocate_device();
124 if (!aaedkbd || !input_dev) {
129 platform_set_drvdata(pdev, aaedkbd);
131 aaedkbd->input = input_dev;
133 /* Init keyboard rescan workqueue */
134 INIT_WORK(&aaedkbd->workq, aaedkbd_work, aaedkbd);
136 memcpy(aaedkbd->keycode, aaedkbd_keycode, sizeof(aaedkbd->keycode));
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;
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);
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);
156 input_dev->open = aaedkbd_open;
157 input_dev->close = aaedkbd_close;
159 error = input_register_device(aaedkbd->input);
165 fail: kfree(aaedkbd);
166 input_free_device(input_dev);
170 static int __devexit aaedkbd_remove(struct platform_device *pdev)
172 struct aaedkbd *aaedkbd = platform_get_drvdata(pdev);
174 input_unregister_device(aaedkbd->input);
180 static struct platform_driver aaedkbd_driver = {
181 .probe = aaedkbd_probe,
182 .remove = __devexit_p(aaedkbd_remove),
184 .name = "aaed2000-keyboard",
188 static int __init aaedkbd_init(void)
190 return platform_driver_register(&aaedkbd_driver);
193 static void __exit aaedkbd_exit(void)
195 platform_driver_unregister(&aaedkbd_driver);
198 module_init(aaedkbd_init);
199 module_exit(aaedkbd_exit);
201 MODULE_AUTHOR("Nicolas Bellido Y Ortega");
202 MODULE_DESCRIPTION("AAED-2000 Keyboard Driver");
203 MODULE_LICENSE("GPLv2");