DevKit8500D/A User Manual - DMCS Pages for Students

.id = -1,
.dev = {
.platform_data = &gpio_key_info,
},
};
2) GPIO pinmux Configuration
Setup the GPIO 26, 29 as M4 (GPIO mode), IEM (Input enable).
u-boot-03.00.02.07/board/devkit8500.h
/*
* IEN - Input Enable
* IDIS - Input Disable
* PTD - Pull type Down
* PTU - Pull type Up
* DIS - Pull type selection is inactive
* EN - Pull type selection is active
* M0 - Mode 0
* The commented string gives the final mux configuration for that pin
*/
MUX_VAL(CP(ETK_D12_ES2),
MUX_VAL(CP(ETK_D15_ES2),
(IEN | PTU | DIS | M4)) /*GPIO_26*/\
(IEN | PTU | DIS | M4)) /*GPIO_29*/\
3) Driver Design
linux-2.6.32-devkit8500/drivers/input/keyboard/gpio_keys.c
a) Structure for platform_driver_register to register gpio_keys driver.
static struct platform_driver gpio_keys_device_driver = {
.probe
.remove
= gpio_keys_probe,
= __devexit_p(gpio_keys_remove),
.driver = {
.name
= "gpio-keys",
#ifdef CONFIG_PM
.owner = THIS_MODULE,
.pm
= &gpio_keys_pm_ops,
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