Embest SBC8600B, Quick Start Manual

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6.5 Driver Development
6.5.1 Driver for the gpio_keys
1. Device definition
Linux-3.2.0-psp04.06.00.08.sdk/arch/arm/mach-omap2/board-am335xev
m.c
Setup GPIO 0.2 as a “menu” key, return value as “KEY_F1”, triggered on low
level; set GPIO 2.1 as a ”back”key, return value as ”KEY_ESC”, triggered on
low level, the structure template is shown below.
static struct gpio_keys_button gpio_key_buttons[] = {
{
.code = KEY_F1,
.gpio = GPIO_TO_PIN(0, 20),
.active_low = true,
.desc = "menu",
.type = EV_KEY,
// .wakeup = 1,
},
{
.code = KEY_ESC,
.gpio = GPIO_TO_PIN(2, 1),
.active_low = true,
.desc = "back",
.type = EV_KEY,
// .wakeup = 1,
},
};
static struct gpio_keys_platform_data gpio_key_info = {
.buttons = gpio_key_buttons,
.nbuttons = ARRAY_SIZE(gpio_key_buttons),
};
static struct platform_device gpio_keys = {
.name = "gpio-keys",
.id = -1,
.dev = {
.platform_data = &gpio_key_info,
},
};