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 <mach/hardware.h> 24#include <mach/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 35static 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 46struct 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 55static 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 */ 71static 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 95static 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 148static 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 */ 160MODULE_ALIAS("platform:aaed2000-keyboard"); 161 162static 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 171static int __init aaedkbd_init(void) 172{ 173 return platform_driver_register(&aaedkbd_driver); 174} 175 176static void __exit aaedkbd_exit(void) 177{ 178 platform_driver_unregister(&aaedkbd_driver); 179} 180 181module_init(aaedkbd_init); 182module_exit(aaedkbd_exit); 183 184MODULE_AUTHOR("Nicolas Bellido Y Ortega"); 185MODULE_DESCRIPTION("AAED-2000 Keyboard Driver"); 186MODULE_LICENSE("GPL v2"); 187