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标题:
程序注解
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作者:
rgf
时间:
2018-1-19 19:02
标题:
程序注解
求大神给下面的程序做注解，请稍详细些，谢谢。
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/gpio.h>
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#include <linux/leds.h>
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#include <linux/platform_device.h>
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#include <asm/mach-types.h>
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#include <asm/mach/arch.h>
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#include <mach/da8xx.h>
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#include <mach/mux.h>
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#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)
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#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)
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#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)
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#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)
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/* assign the tl som board LED-GPIOs*/
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static const short da850_evm_tl_user_led_pins[] = {
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/* These pins are definition at <mach/mux.h> file */
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DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,
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-1
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};
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static struct gpio_led da850_evm_tl_leds[] = {
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{
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.active_low = 0,
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.gpio = DA850_USER_LED0,
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.name = "user_led0",
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.default_trigger = "default-on",
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},
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{
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.active_low = 0,
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.gpio = DA850_USER_LED1,
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.name = "user_led1",
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.default_trigger = "default-on",
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},
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{
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.active_low = 0,
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.gpio = DA850_USER_LED2,
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.name = "user_led2",
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.default_trigger = "default-on",
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},
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{
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.active_low = 0,
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.gpio = DA850_USER_LED3,
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.name = "user_led3",
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.default_trigger = "default-on",
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},
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};
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static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {
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.leds = da850_evm_tl_leds,
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.num_leds = ARRAY_SIZE(da850_evm_tl_leds),
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};
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static void led_dev_release(struct device *dev)
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{
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};
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static struct platform_device da850_evm_tl_leds_device = {
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.name = "leds-gpio",
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.id = 1,
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.dev = {
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.platform_data = &da850_evm_tl_leds_pdata,
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.release = led_dev_release,
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}
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};
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static int __init led_platform_init(void)
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{
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int ret;
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#if 0
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ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);
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if (ret)
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pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
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"%d\n", ret);
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#endif
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ret = platform_device_register(&da850_evm_tl_leds_device);
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if (ret)
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pr_warning("Could not register som GPIO expander LEDS");
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else
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printk(KERN_INFO "LED register sucessful!\n");
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return ret;
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}
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static void __exit led_platform_exit(void)
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{
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platform_device_unregister(&da850_evm_tl_leds_device);
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printk(KERN_INFO "LED unregister!\n");
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}
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module_init(led_platform_init);
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module_exit(led_platform_exit);
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MODULE_DESCRIPTION("Led platform driver");
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MODULE_AUTHOR("Tronlong");
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MODULE_LICENSE("GPL");
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