tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
36static 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
47struct 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
57static 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 */
72static 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
98static 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
107static 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
115static 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
170static 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
180static struct platform_driver aaedkbd_driver = {
181 .probe = aaedkbd_probe,
182 .remove = __devexit_p(aaedkbd_remove),
183 .driver = {
184 .name = "aaed2000-keyboard",
185 },
186};
187
188static int __init aaedkbd_init(void)
189{
190 return platform_driver_register(&aaedkbd_driver);
191}
192
193static void __exit aaedkbd_exit(void)
194{
195 platform_driver_unregister(&aaedkbd_driver);
196}
197
198module_init(aaedkbd_init);
199module_exit(aaedkbd_exit);
200
201MODULE_AUTHOR("Nicolas Bellido Y Ortega");
202MODULE_DESCRIPTION("AAED-2000 Keyboard Driver");
203MODULE_LICENSE("GPLv2");