i2c 设备模型
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spi设备驱动模型
spi的驱动模板如下1
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struct spi_device *sensor_spi=NULL;
int sensor_spi_write(void)
{
return 0;
}
int sensor_spi_read(void)
{
return 0;
}
static const struct spi_device_id sensor_spi_id[] = {
{ DEVICE_NAME, 0 },
{ }
};
MODULE_DEVICE_TABLE(spi, sensor_spi_id);
static int sensor_probe(struct spi_device *spi)
{
sensor_spi=spi;
return 0;
}
static int sensor_remove(struct spi_device *spi)
{
return 0;
}
static struct spi_driver sensor_driver = {
.driver = {
.name = DEVICE_NAME,
.owner = THIS_MODULE,
},
.probe = sensor_probe,
.remove = sensor_remove,
.id_table = sensor_spi_id,
};
static __init int sensor_spi_init(void)
{
int status=-1;
struct spi_master *master;
struct spi_device *spi;
struct spi_board_info chip =
{
.modalias = DEVICE_NAME,
.mode = 0x00,
.bus_num = 0,
.chip_select = 0,
.max_speed_hz = 2000000,
};
spi_register_driver(&sensor_driver);
if (status<0)
{
pr_err("%s: spi_register_driver spi_driver failure. status = %d\n", __func__, status);
}
pr_err("%s: spi_register_driver spi_driver success. status = %d\n", __func__, status);
master = spi_busnum_to_master(SENSOR_SPI_BUS);
if (!master)
{
status = -ENODEV;
goto error_busnum;
}
spi = spi_new_device(master, &chip);
if (!spi)
{
status = -EBUSY;
goto error_mem;
}
return status;
error_mem:
error_busnum:
spi_unregister_driver(&sensor_driver);
return status;
}
static __exit void sensor_spi_exit(void)
{
spi_unregister_driver(&sensor_driver);
if(sensor_spi!=NULL)
spi_unregister_device(sensor_spi);
}
module_init(sensor_spi_init);
module_exit(sensor_spi_exit);
MODULE_LICENSE("GPL v2");