linux dts i2c

最新推荐文章于 2025-07-22 15:46:06 发布

gaoguoxin2

最新推荐文章于 2025-07-22 15:46:06 发布

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分类专栏： linux驱动 freesale imx6sl

本文链接：https://blog.youkuaiyun.com/gaoguoxin2/article/details/53428071

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本文介绍了在Linux环境下为lis3dh加速度计配置设备树(dts)及相应驱动的方法。通过设备树文件imx6sl-evk.dts添加lis3dh设备节点，并在内核源码中实现lis3dh平台数据结构和设备ID匹配表。最终实现了lis3dh加速度计的正确加载和使用。

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http://www.voidcn.com/blog/sevenjoin/article/p-4954234.html

http://blog.youkuaiyun.com/u013129593/article/details/53010773

http://www.cnblogs.com/lihaiyan/p/4475194.html

http://www.voidcn.com/blog/xishuang_gongzi/article/p-6240391.html

1. dts configuration

kernel_imx/arch/arm/boot/dts/imx6sl-evk.dts

&i2c2{
...
       /*luke add for lis3dh st*/
        lis3dh@18 {
                compatible = "st,lis3dh";
                reg = <0x18>;
                status = "okay";
        };  
      /*ed*/
};

2. c source

CONFIG_OF is the adding for dts

#ifdef CONFIG_OF
static struct lis3dh_acc_platform_data lis3dh_pdata = {
.poll_interval = 10,
.min_interval  = 10,
.axis_map_x    = 0,
.axis_map_y    = 1,
.axis_map_z    = 2,
.negate_x      = 1,
.negate_y      = 0,
.negate_z      = 1,
.gpio_int1     = -EINVAL,
.gpio_int2     = -EINVAL,
};

static const struct of_device_id lis3dh_i2c_dt_ids[] = {
	{
	  .compatible = "st,lis3dh",
  }
}

MODULE_DEVICE_TABLE(of,lis3dh_i2c_dt_ids);
#endif

static int lis3dh_acc_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
{


  #ifdef CONFIG_OF
  client->dev.platform_data = &lis3dh_pdata;	
  #endif

...
	return 0;

}


static struct i2c_driver lis3dh_acc_driver = {
	.driver = {
			.owner = THIS_MODULE,
			.name = LIS3DH_ACC_DEV_NAME,
			#ifdef CONFIG_OF
			.of_match_table = of_match_ptr(lis3dh_i2c_dt_ids),
			#endif
		  },
	.probe = lis3dh_acc_probe,
	.remove = lis3dh_acc_remove, 
	.id_table = lis3dh_acc_id,
};

static int __init lis3dh_acc_init(void)
{
	return i2c_add_driver(&lis3dh_acc_driver);
}

static void __exit lis3dh_acc_exit(void)
{
	i2c_del_driver(&lis3dh_acc_driver);
}

module_init(lis3dh_acc_init);
module_exit(lis3dh_acc_exit);

MODULE_DESCRIPTION("lis3dh accelerometer sysfs driver");
MODULE_AUTHOR("Matteo Dameno, Carmine Iascone, STMicroelectronics");
MODULE_LICENSE("GPL");