Linux下SPI和IIC驱动免在设备树上添加设备信息的编写方法
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编写驱动时,一般需要往设备树上添加节点信息,这里提供一种直接在驱动中添加设备信息的方法。
i2c的驱动模板如下
#include <linux/module.h> #include <linux/i2c.h> #define SENSOR_BUS_NUM 0 #define SENSOR_SLAVE_ADDRESS 0x3e #define SENSOR_NAME "sensor" struct i2c_client *sensor_client=NULL; static int sensor_probe(struct i2c_client *client,const struct i2c_device_id *id) { sensor_client=client; return 0; } static int sensor_remove(struct i2c_client *client) { return 0; } static const struct i2c_device_id sensor_id[] = { {SENSOR_NAME, 0}, { } }; MODULE_DEVICE_TABLE(i2c, sensor_id); static struct i2c_driver sensor_driver = { .driver = { .name = SENSOR_NAME, }, .probe = sensor_probe, .remove = sensor_remove, .id_table = sensor_id, }; static struct i2c_board_info sensor_device = { I2C_BOARD_INFO("hmc5883l-i2c", SENSOR_SLAVE_ADDRESS), }; static int __init sensor_init(void) { struct i2c_adapter *adap; struct i2c_client *client; adap = i2c_get_adapter(sensor_bus_num); if (!adap) { printk("i2c adapter %d\n",sensor_bus_num); return -ENODEV; } else { printk("get ii2 adapter %d ok\n", sensor_bus_num); client = i2c_new_device(adap, &sensor_device); } if (!client) { printk("get i2c client %s @ 0x%02x fail!\n", sensor_device.type, sensor_device.addr); return -ENODEV; } else { printk("get i2c client ok!\n"); } i2c_put_adapter(adap); i2c_add_driver(&sensor_driver); printk("sensor init success!\n"); return 0; } static void __exit sensor_exit(void) { i2c_del_driver(&sensor_driver); if(sensor_client!=NULL) i2c_unregister_device(sensor_client); printk("Module removed\n"); } module_init(sensor_init); module_exit(sensor_exit); ODULE_AUTHOR("GPL"); ODULE_LICENSE("GPL");
spi的驱动模板如下
#include <linux/module.h> #include <linux/spi/spi.h> #define DEVICE_NAME "sensor" #define SENSOR_SPI_BUS 0 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");
原文:http://blog.csdn.net/mike8825/article/details/51335582
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