MIPS: ath79: add common GPIO buttons device
[linux-2.6.git] / arch / mips / ath79 / mach-pb44.c
1 /*
2  *  Atheros PB44 reference board support
3  *
4  *  Copyright (C) 2009-2010 Gabor Juhos <juhosg@openwrt.org>
5  *
6  *  This program is free software; you can redistribute it and/or modify it
7  *  under the terms of the GNU General Public License version 2 as published
8  *  by the Free Software Foundation.
9  */
10
11 #include <linux/init.h>
12 #include <linux/platform_device.h>
13 #include <linux/i2c.h>
14 #include <linux/i2c-gpio.h>
15 #include <linux/i2c/pcf857x.h>
16
17 #include "machtypes.h"
18 #include "dev-gpio-buttons.h"
19 #include "dev-leds-gpio.h"
20
21 #define PB44_GPIO_I2C_SCL       0
22 #define PB44_GPIO_I2C_SDA       1
23
24 #define PB44_GPIO_EXP_BASE      16
25 #define PB44_GPIO_SW_RESET      (PB44_GPIO_EXP_BASE + 6)
26 #define PB44_GPIO_SW_JUMP       (PB44_GPIO_EXP_BASE + 8)
27 #define PB44_GPIO_LED_JUMP1     (PB44_GPIO_EXP_BASE + 9)
28 #define PB44_GPIO_LED_JUMP2     (PB44_GPIO_EXP_BASE + 10)
29
30 #define PB44_KEYS_POLL_INTERVAL         20      /* msecs */
31 #define PB44_KEYS_DEBOUNCE_INTERVAL     (3 * PB44_KEYS_POLL_INTERVAL)
32
33 static struct i2c_gpio_platform_data pb44_i2c_gpio_data = {
34         .sda_pin        = PB44_GPIO_I2C_SDA,
35         .scl_pin        = PB44_GPIO_I2C_SCL,
36 };
37
38 static struct platform_device pb44_i2c_gpio_device = {
39         .name           = "i2c-gpio",
40         .id             = 0,
41         .dev = {
42                 .platform_data  = &pb44_i2c_gpio_data,
43         }
44 };
45
46 static struct pcf857x_platform_data pb44_pcf857x_data = {
47         .gpio_base      = PB44_GPIO_EXP_BASE,
48 };
49
50 static struct i2c_board_info pb44_i2c_board_info[] __initdata = {
51         {
52                 I2C_BOARD_INFO("pcf8575", 0x20),
53                 .platform_data  = &pb44_pcf857x_data,
54         },
55 };
56
57 static struct gpio_led pb44_leds_gpio[] __initdata = {
58         {
59                 .name           = "pb44:amber:jump1",
60                 .gpio           = PB44_GPIO_LED_JUMP1,
61                 .active_low     = 1,
62         }, {
63                 .name           = "pb44:green:jump2",
64                 .gpio           = PB44_GPIO_LED_JUMP2,
65                 .active_low     = 1,
66         },
67 };
68
69 static struct gpio_keys_button pb44_gpio_keys[] __initdata = {
70         {
71                 .desc           = "soft_reset",
72                 .type           = EV_KEY,
73                 .code           = KEY_RESTART,
74                 .debounce_interval = PB44_KEYS_DEBOUNCE_INTERVAL,
75                 .gpio           = PB44_GPIO_SW_RESET,
76                 .active_low     = 1,
77         } , {
78                 .desc           = "jumpstart",
79                 .type           = EV_KEY,
80                 .code           = KEY_WPS_BUTTON,
81                 .debounce_interval = PB44_KEYS_DEBOUNCE_INTERVAL,
82                 .gpio           = PB44_GPIO_SW_JUMP,
83                 .active_low     = 1,
84         }
85 };
86
87 static void __init pb44_init(void)
88 {
89         i2c_register_board_info(0, pb44_i2c_board_info,
90                                 ARRAY_SIZE(pb44_i2c_board_info));
91         platform_device_register(&pb44_i2c_gpio_device);
92
93         ath79_register_leds_gpio(-1, ARRAY_SIZE(pb44_leds_gpio),
94                                  pb44_leds_gpio);
95         ath79_register_gpio_keys_polled(-1, PB44_KEYS_POLL_INTERVAL,
96                                         ARRAY_SIZE(pb44_gpio_keys),
97                                         pb44_gpio_keys);
98 }
99
100 MIPS_MACHINE(ATH79_MACH_PB44, "PB44", "Atheros PB44 reference board",
101              pb44_init);