Linux设备驱动 -IIC主机驱动注册

Durriya ·

更新时间:2024-09-21

· 690 次阅读

i2c驱动注册和卸载。 i2c设备驱动初始化完成-进入probe函数。
i2c_del_driver/i2c_add_driver,i2c_driver
module_init和late_initcall：module_init先运行，late_initcall后运行

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#ifdef CONFIG_HAS_EARLYSUSPEND
#include 
#endif
#include 
#include 
#include 
#include 
static int i2c_test_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
	printk("==%s:\n", __FUNCTION__);
	return 0;
}
static int __devexit i2c_test_remove(struct i2c_client *client)
{
	i2c_set_clientdata(client, NULL);
	printk("==%s:\n", __FUNCTION__);
	return 0;
}
static const struct i2c_device_id i2c_test_id[] = {
	{ "i2c_test", 0 },
	{ }
};
static struct i2c_driver i2c_test_driver = {
	.probe		= i2c_test_probe,
	.remove		= __devexit_p(i2c_test_remove),
	.id_table	= i2c_test_id,
	.driver	= {
		.name	= "i2c_test",
		.owner	= THIS_MODULE,
	},
};
static void i2c_io_init(void)
{
	int ret;
	ret = gpio_request(EXYNOS4_GPL0(2), "TP1_EN");
	if (ret) {
		printk(KERN_ERR "failed to request TP1_EN for "
				"I2C control\n");
		//return err;
	}
	gpio_direction_output(EXYNOS4_GPL0(2), 1);
	s3c_gpio_cfgpin(EXYNOS4_GPL0(2), S3C_GPIO_OUTPUT);
	gpio_free(EXYNOS4_GPL0(2));
	mdelay(5);
	ret = gpio_request(EXYNOS4_GPX0(3), "GPX0_3");
	if (ret) {
		gpio_free(EXYNOS4_GPX0(3));
		ret = gpio_request(EXYNOS4_GPX0(3), "GPX0_3");
	if(ret)
	{
		printk("ft5xox: Failed to request GPX0_3 \n");
	}
	}
	gpio_direction_output(EXYNOS4_GPX0(3), 0);
	mdelay(200);
	gpio_direction_output(EXYNOS4_GPX0(3), 1);
	s3c_gpio_cfgpin(EXYNOS4_GPX0(3), S3C_GPIO_OUTPUT);
	gpio_free(EXYNOS4_GPX0(3));
	msleep(300);	
}
static int __init i2c_test_init(void)
{
	printk("==%s:\n", __FUNCTION__);
	i2c_io_init();
	printk("==%s:\n", __FUNCTION__);
	return i2c_add_driver(&i2c_test_driver);
}
static void __exit i2c_test_exit(void)
{
	printk("==%s:\n", __FUNCTION__);
	i2c_del_driver(&i2c_test_driver);
}
late_initcall(i2c_test_init);
module_exit(i2c_test_exit);
MODULE_AUTHOR("xunwei_rty");
MODULE_DESCRIPTION("TsI2CTest");
MODULE_LICENSE("GPL");

作者：IOT技术栈

iic Linux

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