程序注解

rgf · 发表于 2018-1-19 19:02:07

求大神给下面的程序做注解，请稍详细些，谢谢。
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/gpio.h>
#include <linux/leds.h>
#include <linux/platform_device.h>

#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <mach/da8xx.h>
#include <mach/mux.h>

#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)
#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)
#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)

/* assign the tl som board LED-GPIOs*/
static const short da850_evm_tl_user_led_pins[] = {
/* These pins are definition at <mach/mux.h> file */
DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,
-1
};

static struct gpio_led da850_evm_tl_leds[] = {
{
.active_low = 0,
.gpio = DA850_USER_LED0,
.name = "user_led0",
.default_trigger = "default-on",
},
{
.active_low = 0,
.gpio = DA850_USER_LED1,
.name = "user_led1",
.default_trigger = "default-on",
},
{
.active_low = 0,
.gpio = DA850_USER_LED2,
.name = "user_led2",
.default_trigger = "default-on",
},
{
.active_low = 0,
.gpio = DA850_USER_LED3,
.name = "user_led3",
.default_trigger = "default-on",
},
};

static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {
.leds = da850_evm_tl_leds,
.num_leds = ARRAY_SIZE(da850_evm_tl_leds),
};

static void led_dev_release(struct device *dev)
{
};

static struct platform_device da850_evm_tl_leds_device = {
.name = "leds-gpio",
.id = 1,
.dev = {
.platform_data = &da850_evm_tl_leds_pdata,
.release = led_dev_release,
}
};

static int __init led_platform_init(void)
{
int ret;
#if 0
ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);
if (ret)
pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
"%d\n", ret);
#endif
ret = platform_device_register(&da850_evm_tl_leds_device);
if (ret)
pr_warning("Could not register som GPIO expander LEDS");
else
printk(KERN_INFO "LED register sucessful!\n");

return ret;
}

static void __exit led_platform_exit(void)
{
platform_device_unregister(&da850_evm_tl_leds_device);

printk(KERN_INFO "LED unregister!\n");
}

module_init(led_platform_init);
module_exit(led_platform_exit);

MODULE_DESCRIPTION("Led platform driver");
MODULE_AUTHOR("Tronlong");
MODULE_LICENSE("GPL");

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