修改设备树
修改 pinctrl_tsc
原来配置如下：
pinctrl_tsc: tscgrp {
fsl,pins = <
MX6UL_PAD_GPIO1_IO01__GPIO1_IO01 0xb0
MX6UL_PAD_GPIO1_IO02__GPIO1_IO02 0xb0
MX6UL_PAD_GPIO1_IO03__GPIO1_IO03 0xb0
MX6UL_PAD_GPIO1_IO04__GPIO1_IO04 0xb0
>;
};
修改后配置如下：
pinctrl_tsc: tscgrp {
fsl,pins = <
MX6UL_PAD_GPIO1_IO09__GPIO1_IO09 0XF080 /* TSC_INT */
>;
};
删除复用IO
添加节点
gt9147是使用i2c进行通信，从机地址是0x14,在i2c2添加如下
gt9147:gt9147@14 {
compatible = "goodix,gt9147", "goodix,gt9xx";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_tsc>;
reg = <0x14>;
interrupt-parent = <&gpio1>;
interrupts = <9 0>;
reset-gpios = <&gpio5 9 GPIO_ACTIVE_LOW>;
interrupt-gpios = <&gpio1 9 GPIO_ACTIVE_LOW>;
status = "okay";
};
编译设备树更新到开发板
添加驱动程序，驱动代码如下
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/gpio/consumer.h>
#include <linux/of_irq.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include <linux/input/mt.h>
#include <linux/input/touchscreen.h>
#include <linux/i2c.h>
#define GT_CTRL_REG 0X8040 /* GT9147控制寄存器 */
#define GT_MODSW_REG 0X804D /* GT9147模式切换寄存器 */
#define GT_CFGS_REG 0X8047 /* GT9147配置起始地址寄存器 */
#define GT_CHECK_REG 0X80FF /* GT9147校验和寄存器 */
#define GT_PID_REG 0X8140 /* GT9147产品ID寄存器 */
#define GT_GSTID_REG 0X814E /* GT9147当前检测到的触摸情况 */
#define GT_TP1_REG 0X814F /* 第一个触摸点数据地址 */
#define GT_TP2_REG 0X8157 /* 第二个触摸点数据地址 */
#define GT_TP3_REG 0X815F /* 第三个触摸点数据地址 */
#define GT_TP4_REG 0X8167 /* 第四个触摸点数据地址 */
#define GT_TP5_REG 0X816F /* 第五个触摸点数据地址 */
#define MAX_SUPPORT_POINTS 5 /* 最多5点电容触摸 */
struct gt9147_dev {
int irq_pin,reset_pin; /* 中断和复位IO */
int irqnum; /* 中断号 */
void *private_data; /* 私有数据 */
struct input_dev *input; /* input结构体 */
struct i2c_client *client; /* I2C客户端 */
};
struct gt9147_dev gt9147;
const unsigned char GT9147_CT[]=
{
0x48,0xe0,0x01,0x10,0x01,0x05,0x0d,0x00,0x01,0x08,
0x28,0x05,0x50,0x32,0x03,0x05,0x00,0x00,0xff,0xff,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x89,0x28,0x0a,
0x17,0x15,0x31,0x0d,0x00,0x00,0x02,0x9b,0x03,0x25,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x32,0x00,0x00,
0x00,0x0f,0x94,0x94,0xc5,0x02,0x07,0x00,0x00,0x04,
0x8d,0x13,0x00,0x5c,0x1e,0x00,0x3c,0x30,0x00,0x29,
0x4c,0x00,0x1e,0x78,0x00,0x1e,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x08,0x0a,0x0c,0x0e,0x10,0x12,0x14,0x16,
0x18,0x1a,0x00,0x00,0x00,0x00,0x1f,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0x00,0x02,0x04,0x05,0x06,0x08,0x0a,0x0c,
0x0e,0x1d,0x1e,0x1f,0x20,0x22,0x24,0x28,0x29,0xff,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,
};
/*
* @description : 复位GT9147
* @param - client : 要操作的i2c
* @param - multidev: 自定义的multitouch设备
* @return : 0，成功;其他负值,失败
*/
static int gt9147_ts_reset(struct i2c_client *client, struct gt9147_dev *dev)
{
int ret = 0;
/* 申请复位IO*/
if (gpio_is_valid(dev->reset_pin)) {
/* 申请复位IO，并且默认输出高电平 */
ret = devm_gpio_request_one(&client->dev,
dev->reset_pin, GPIOF_OUT_INIT_HIGH,
"gt9147 reset");
if (ret) {
return ret;
}
}
/* 申请中断IO*/
if (gpio_is_valid(dev->irq_pin)) {
/* 申请复位IO，并且默认输出高电平 */
ret = devm_gpio_request_one(&client->dev,
dev->irq_pin, GPIOF_OUT_INIT_HIGH,
"gt9147 int");
if (ret) {
return ret;
}
}
/* 4、初始化GT9147，要严格按照GT9147时序要求 */
gpio_set_value(dev->reset_pin, 0); /* 复位GT9147 */
msleep(10);
gpio_set_value(dev->reset_pin, 1); /* 停止复位GT9147 */
msleep(10);
gpio_set_value(dev->irq_pin, 0); /* 拉低INT引脚 */
msleep(50);
gpio_direction_input(dev->irq_pin); /* INT引脚设置为输入 */
return 0;
}
/*
* @description : 从GT9147读取多个寄存器数据
* @param - dev: GT9147设备
* @param - reg: 要读取的寄存器首地址
* @param - buf: 读取到的数据
* @param - len: 要读取的数据长度
* @return : 操作结果
*/
static int gt9147_read_regs(struct gt9147_dev *dev, u16 reg, u8 *buf, int len)
{
int ret;
u8 regdata[2];
struct i2c_msg msg[2];
struct i2c_client *client = (struct i2c_client *)dev->client;
/* GT9147寄存器长度为2个字节 */
regdata[0] = reg >> 8;
regdata[1] = reg & 0xFF;
/* msg[0]为发送要读取的首地址 */
msg[0].addr = client->addr; /* ft5x06地址 */
msg[0].flags = !I2C_M_RD; /* 标记为发送数据 */
msg[0].buf = ®data[0]; /* 读取的首地址 */
msg[0].len = 2; /* reg长度*/
/* msg[1]读取数据 */
msg[1].addr = client->addr; /* ft5x06地址 */
msg[1].flags = I2C_M_RD; /* 标记为读取数据*/
msg[1].buf = buf; /* 读取数据缓冲区 */
msg[1].len = len; /* 要读取的数据长度*/
ret = i2c_transfer(client->adapter, msg, 2);
if(ret == 2) {
ret = 0;
} else {
ret = -EREMOTEIO;
}
return ret;
}
/*
* @description : 向GT9147多个寄存器写入数据
* @param - dev: GT9147设备
* @param - reg: 要写入的寄存器首地址
* @param - val: 要写入的数据缓冲区
* @param - len: 要写入的数据长度
* @return : 操作结果
*/
static s32 gt9147_write_regs(struct gt9147_dev *dev, u16 reg, u8 *buf, u8 len)
{
u8 b[256];
struct i2c_msg msg;
struct i2c_client *client = (struct i2c_client *)dev->client;
b[0] = reg >> 8; /* 寄存器首地址低8位 */
b[1] = reg & 0XFF; /* 寄存器首地址高8位 */
memcpy(&b[2],buf,len); /* 将要写入的数据拷贝到数组b里面 */
msg.addr = client->addr; /* gt9147地址 */
msg.flags = 0; /* 标记为写数据 */
msg.buf = b; /* 要写入的数据缓冲区 */
msg.len = len + 2; /* 要写入的数据长度 */
return i2c_transfer(client->adapter, &msg, 1);
}
static irqreturn_t gt9147_irq_handler(int irq, void *dev_id)
{
int touch_num = 0;
int input_x, input_y;
int id = 0;
int ret = 0;
u8 data;
u8 touch_data[5];
struct gt9147_dev *dev = dev_id;
ret = gt9147_read_regs(dev, GT_GSTID_REG, &data, 1);
if (data == 0x00) { /* 没有触摸数据，直接返回 */
goto fail;
} else { /* 统计触摸点数据 */
touch_num = data & 0x0f;
}
/* 由于GT9147没有硬件检测每个触摸点按下和抬起，因此每个触摸点的抬起和按
* 下不好处理，尝试过一些方法，但是效果都不好，因此这里暂时使用单点触摸
*/
if(touch_num) { /* 单点触摸按下 */
gt9147_read_regs(dev, GT_TP1_REG, touch_data, 5);
id = touch_data[0] & 0x0F;
if(id == 0) {
input_x = touch_data[1] | (touch_data[2] << 8);
input_y = touch_data[3] | (touch_data[4] << 8);
input_mt_slot(dev->input, id);
input_mt_report_slot_state(dev->input, MT_TOOL_FINGER, true);
input_report_abs(dev->input, ABS_MT_POSITION_X, input_x);
input_report_abs(dev->input, ABS_MT_POSITION_Y, input_y);
}
} else if(touch_num == 0){ /* 单点触摸释放 */
input_mt_slot(dev->input, id);
input_mt_report_slot_state(dev->input, MT_TOOL_FINGER, false);
}
input_mt_report_pointer_emulation(dev->input, true);
input_sync(dev->input);
data = 0x00; /* 向0X814E寄存器写0 */
gt9147_write_regs(dev, GT_GSTID_REG, &data, 1);
fail:
return IRQ_HANDLED;
}
/*
* @description : GT9147中断初始化
* @param - client : 要操作的i2c
* @param - multidev: 自定义的multitouch设备
* @return : 0，成功;其他负值,失败
*/
static int gt9147_ts_irq(struct i2c_client *client, struct gt9147_dev *dev)
{
int ret = 0;
/* 2，申请中断,client->irq就是IO中断， */
ret = devm_request_threaded_irq(&client->dev, client->irq, NULL,
gt9147_irq_handler, IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
client->name, >9147);
if (ret) {
dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
return ret;
}
return 0;
}
/*
* @description : 发送GT9147配置参数
* @param - client: i2c_client
* @param - mode: 0,参数不保存到flash
* 1,参数保存到flash
* @return : 无
*/
void gt9147_send_cfg(struct gt9147_dev *dev, unsigned char mode)
{
unsigned char buf[2];
unsigned int i = 0;
buf[0] = 0;
buf[1] = mode; /* 是否写入到GT9147 FLASH? 即是否掉电保存 */
for(i = 0; i < (sizeof(GT9147_CT)); i++) /* 计算校验和 */
buf[0] += GT9147_CT[i];
buf[0] = (~buf[0]) + 1;
/* 发送寄存器配置 */
gt9147_write_regs(dev, GT_CFGS_REG, (u8 *)GT9147_CT, sizeof(GT9147_CT));
gt9147_write_regs(dev, GT_CHECK_REG, buf, 2);/* 写入校验和,配置更新标记 */
}
int gt9147_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
u8 data, ret;
gt9147.client = client;
/* 1，获取设备树中的中断和复位引脚 */
gt9147.irq_pin = of_get_named_gpio(client->dev.of_node, "interrupt-gpios", 0);
gt9147.reset_pin = of_get_named_gpio(client->dev.of_node, "reset-gpios", 0);
/* 2，复位GT9147 */
ret = gt9147_ts_reset(client, >9147);
if(ret < 0) {
goto fail;
}
/* 3，初始化GT9147 */
data = 0x02;
gt9147_write_regs(>9147, GT_CTRL_REG, &data, 1); /* 软复位 */
mdelay(100);
data = 0x0;
gt9147_write_regs(>9147, GT_CTRL_REG, &data, 1); /* 停止软复位 */
mdelay(100);
/* 4,初始化GT9147，烧写固件
gt9147_read_regs(>9147, GT_CFGS_REG, &data, 1);
printk("GT9147 ID =%#X\r\n", data);
if(data < GT9147_CT[0]) {
gt9147_send_cfg(>9147, 0); 芯片内置固件已能够使用，无需下载固件
} */
/* 5，input设备注册 */
gt9147.input = devm_input_allocate_device(&client->dev);
if (!gt9147.input) {
ret = -ENOMEM;
goto fail;
}
gt9147.input->name = client->name;
gt9147.input->id.bustype = BUS_I2C;
gt9147.input->dev.parent = &client->dev;
__set_bit(EV_KEY, gt9147.input->evbit);
__set_bit(EV_ABS, gt9147.input->evbit);
__set_bit(BTN_TOUCH, gt9147.input->keybit);
input_set_abs_params(gt9147.input, ABS_X, 0, 480, 0, 0);
input_set_abs_params(gt9147.input, ABS_Y, 0, 272, 0, 0);
input_set_abs_params(gt9147.input, ABS_MT_POSITION_X,0, 480, 0, 0);
input_set_abs_params(gt9147.input, ABS_MT_POSITION_Y,0, 272, 0, 0);
ret = input_mt_init_slots(gt9147.input, MAX_SUPPORT_POINTS, 0);
if (ret) {
goto fail;
}
ret = input_register_device(gt9147.input);
if (ret)
goto fail;
/* 6，最后初始化中断 */
ret = gt9147_ts_irq(client, >9147);
if(ret < 0) {
goto fail;
}
return 0;
fail:
return ret;
}
/*
* @description : i2c驱动的remove函数，移除i2c驱动的时候此函数会执行
* @param - client : i2c设备
* @return : 0，成功;其他负值,失败
*/
int gt9147_remove(struct i2c_client *client)
{
input_unregister_device(gt9147.input);
return 0;
}
/*
* 传统驱动匹配表
*/
const struct i2c_device_id gt9147_id_table[] = {
{ "goodix,gt9147", 0, },
{ /* sentinel */ }
};
/*
* 设备树匹配表
*/
const struct of_device_id gt9147_of_match_table[] = {
{.compatible = "goodix,gt9147" },
{ /* sentinel */ }
};
/* i2c驱动结构体 */
struct i2c_driver gt9147_i2c_driver = {
.driver = {
.name = "gt9147",
.owner = THIS_MODULE,
.of_match_table = gt9147_of_match_table,
},
.id_table = gt9147_id_table,
.probe = gt9147_probe,
.remove = gt9147_remove,
};
module_i2c_driver(gt9147_i2c_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("jankin");
编译KO 移植到开发板
.测试触摸是否可用，使用如下指令查看触摸中断次数，及查看驱动是否正常加载
cat /proc/interrupts
添加完成！！！