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TSC2007触摸驱动实验（一）

web 2025/7/29 0:01:50

代码：

#include<linux/init.h>
#include<linux/module.h>
#include<linux/i2c.h>
#include <linux/gpio.h>
#include<linux/of_gpio.h>
#include<linux/interrupt.h>
#include<linux/of_irq.h>
#include <linux/input.h>
#include<linux/delay.h>int irq;
static struct input_dev *tsc2007_dev;
static struct device_node *tsc2007_device_node;
static struct i2c_client *tsc2007_client;
static int tsc2007_read_reg(u8 reg_addr);
static void tsc2007_write_reg(u8 reg_addr,u8 data,u8 len);static void tsc2007_write_reg(u8 reg_addr,u8 data,u8 len)
{u8 buff[256];struct i2c_msg msgs[]={[0]={.addr=tsc2007_client->addr,.flags=0,.len=len+1,.buf=buff,}};buff[0]=reg_addr;memcpy(&buff[1],&data,len);i2c_transfer(tsc2007_client->adapter,msgs,1);
}
static int tsc2007_read_reg(u8 reg_addr)
{u8 data;struct i2c_msg msgs[]={[0]={.addr=tsc2007_client->addr,.flags=0,.len=sizeof(reg_addr),.buf=&reg_addr,},[1]={.addr=tsc2007_client->addr,.flags=1,.len=sizeof(data),.buf=&data,},};i2c_transfer(tsc2007_client->adapter,msgs,2);return data;
}
static const struct i2c_device_id tsc2007_id_ts[]=
{{"xxx",0},{}
};
static const struct of_device_id tsc2007_id[]=
{{.compatible = "ti,tsc2007",0},{}
};
static irqreturn_t tsc2007_handler(int irq,void *args)
{printk("This is tsc2007_handler\n");return IRQ_HANDLED;
}
int tsc2007_probe(struct i2c_client *client,const struct i2c_device_id *id)
{int ret;int tsc2007_irq_gpio;int tsc2007_reset_gpio;printk("This is tsc2007_probe\n");tsc2007_client=client;tsc2007_device_node=of_find_node_by_path("/soc/aips-bus@02100000/i2c@021a4000/tsc2007@48");if(tsc2007_device_node==NULL){printk("of_find_node_by_path is error\n");return -1;}printk("tsc2007_device_node is %s\n",tsc2007_device_node->name);tsc2007_irq_gpio=of_get_named_gpio(tsc2007_device_node,"gpios",0);if(tsc2007_irq_gpio<0){printk("tsc2007_irq_gpio of_get_named_gpio is error\n");return -2;}/*tsc2007_reset_gpio=of_get_named_gpio(tsc2007_device_node,"reset-gpios",0);if(tsc2007_reset_gpio<0){printk("tsc2007_reset_gpio of_get_named_gpio is error\n");return -3;}*/printk("tsc2007_irq_gpio is %d\n",tsc2007_irq_gpio);//printk("tsc2007_reset_gpio is %d\n",tsc2007_reset_gpio);gpio_free(tsc2007_irq_gpio);ret=gpio_request(tsc2007_irq_gpio,"irq_gpio");if(ret<0){printk("gpio_request is error\n");return -4;}gpio_free(tsc2007_reset_gpio);ret=gpio_request(tsc2007_reset_gpio,"reset_gpio");if(ret<0){printk("tsc2007_reset_gpio_request is error\n");return -5;}gpio_direction_input(tsc2007_irq_gpio);gpio_direction_output(tsc2007_reset_gpio,0);msleep(5);gpio_set_value(tsc2007_reset_gpio,1);irq=gpio_to_irq(tsc2007_irq_gpio);ret=request_irq(irq,tsc2007_handler,IRQ_TYPE_EDGE_FALLING|IRQF_ONESHOT,"tsc2007_irq",NULL);if(ret<0){printk("request_irq is error\n");goto error_request_irq;}tsc2007_dev=input_allocate_device();tsc2007_dev->name="tsc2007_input_test";__set_bit(EV_KEY,tsc2007_dev->evbit);__set_bit(EV_ABS,tsc2007_dev->evbit);__set_bit(BTN_TOUCH,tsc2007_dev->evbit);input_set_abs_params(tsc2007_dev,ABS_X,0,256,0,0);input_set_abs_params(tsc2007_dev,ABS_Y,0,200,0,0);input_set_abs_params(tsc2007_dev,ABS_PRESSURE,0,255,0,0);input_register_device(tsc2007_dev);if(ret<0){printk("input_register_device is error\n");goto error_input_register;}//ret=tsc2007_read_reg(0xd0);//printk("ret is %#x\n",ret);return 0;error_request_irq:free_irq(irq,NULL);return ret;
error_input_register:input_free_device(tsc2007_dev);return ret;
}
int tsc2007_remove(struct i2c_client *i2c_client)
{return 0;
}
static struct i2c_driver tsc2007_driver=
{.driver={.owner=THIS_MODULE,.name="tsc2007_test",.of_match_table=tsc2007_id},.probe=tsc2007_probe,.remove=tsc2007_remove,.id_table=tsc2007_id_ts};
static tsc2007_driver_init(void)
{int ret;ret=i2c_add_driver(&tsc2007_driver);if(ret<0){printk("i2c_add_driver is error\n");return ret;}printk("This is tsc2007_driver_init\n");return 0;
}
static void tsc2007_driver_exit(void)
{free_irq(irq,NULL);input_free_device(tsc2007_dev);i2c_del_driver(&tsc2007_driver);printk("This is tsc2007_driver_exit\n");
}
module_init(tsc2007_driver_init);
module_exit(tsc2007_driver_exit);
MODULE_LICENSE("GPL");

运行效果：