Mini210/kernel

Introduction

The original kernel delivered by FriendlyARM comes with some modules to handle peripherals. I decided to get rid of those modules, especially if they are closed source.

How to add LEDs support in the kernel

BSP file modification

The original BSP provided by FriendlyARM comes with no LEDs support. LEDs are handled by a kernel module instead. I decided to add LEDs support to the BSP to be able to get HeartBeat, NAND and MMC triggers light the LEDs. I took board-omap4panda.c from PandaBoard as an example, and also looked at how it was done on Pengutronix BSP.

You have to declare the LEDs and affect them to the GPIO pins.

...
#if defined(CONFIG_S5PV210_SETUP_IDE)
static struct s3c_ide_platdata mini210_ide_pdata __initdata = {
               .setup_gpio		= s5pv210_ide_setup_gpio,
};
#endif
/* GPIO LED */
#if defined(CONFIG_LEDS_GPIO) || defined(CONFIG_LEDS_GPIO_MODULE)
#include <linux/leds.h>
static struct gpio_led mini210_leds[] = {
       {
               .name = "led1",
               .default_trigger = "heartbeat",
               .gpio = S5PV210_GPJ2(0),
               .active_low = 1,
       },
       {
               .name = "led2",
               .default_trigger = "nand-disk",
               .gpio = S5PV210_GPJ2(1),
               .active_low = 1,
       },
       {
               .name = "led3",
               .default_trigger = "mmc0",
               .gpio = S5PV210_GPJ2(2),
               .active_low = 1,
       },
       {
               .name = "led4",
               .default_trigger = "",
               .gpio = S5PV210_GPJ2(3),
               .active_low = 1,
       },
};
static struct gpio_led_platform_data mini210_leds_info = {
       .num_leds	= ARRAY_SIZE(mini210_leds),
       .leds		= mini210_leds,
};
static struct platform_device leds_mini210 = {
       .name		= "leds-gpio",
       .id		= -1,
       .dev		= {
       .platform_data	= &mini210_leds_info,
       },
};
#endif /* CONFIG_LEDS_GPIO */
#ifdef CONFIG_KEYBOARD_GPIO
static struct gpio_keys_button gpio_buttons[] = {
       {
               .gpio		= S5PV210_GPH2(0),
...
...
...
static struct platform_device *mini210_devices[] __initdata = {
       &s3c_device_adc,
       &s3c_device_cfcon,
       ...
       ...
	&s5p_device_hpd,
    #endif
    #if defined(CONFIG_LEDS_GPIO) || defined(CONFIG_LEDS_GPIO_MODULE)
	&leds_mini210,
    #endif
};
#ifdef CONFIG_VIDEO_S5K4EA
/* Set for MIPI-CSI Camera module Power Enable */
static int mini210_mipi_cam_pwr_en(int enabled)
{
     ...

Kernel configuration

Then you have to enable LEDs handling in the kernel configuration, and also activate the corresponding triggers.

Samsung resistive touchscreen

friendlyArm ftp site (FTP) If you haven't burnt superboot.bin to your SD card, [http://armworks.cc/index.php?title=Mini210S_Burn_rootfs_to_Nand#Burning_...