kernel:max92xx加串解串示例代码[可读取16位寄存器地址]

主要逻辑函数就是max92xx_i2c_read/write

/*!* @file max92xx.c** @brief max92xx GMSL1 DSI Serializer/DESerializer driver** @ingroup LCD*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/pinctrl/consumer.h>
#include <linux/regulator/consumer.h>static int max92xx_probe(struct i2c_client *adapter,const struct i2c_device_id *id);
static int max92xx_remove(struct i2c_client *client);static const struct i2c_device_id max92xx_id[] = {{"max9283", 0},{},
};MODULE_DEVICE_TABLE(i2c, max92xx_id);static int init_max92xx(void);static struct i2c_driver max92xx_i2c_driver = {.driver = {.owner = THIS_MODULE,.name = "max9283",},.probe = max92xx_probe,.remove = max92xx_remove,.id_table = max92xx_id,
};static struct sensor {struct i2c_client *i2c_client;
} max92xx_data;/************************************************************************ I2C transfert.***********************************************************************//*******************************************************
Function:Read data from the i2c slave device.
Input:
Output:
*********************************************************/
unsigned long max92xx_i2c_read(struct i2c_client *client, int address)
{unsigned long rxdata;u8 i2c_buf[8];u8 i2c_addr[8];struct i2c_adapter *adapter;adapter = to_i2c_adapter(client->dev.parent);i2c_addr[0] = (address & 0xff00)>>8;i2c_addr[1] = (address & 0xff);struct i2c_msg msgs[2] = {{.flags   = !I2C_M_RD,.addr  = client->addr,.len = 2,.buf   = i2c_addr,},{.flags   = I2C_M_RD,.addr   = client->addr,.len = 2,.buf   = i2c_buf,},};i2c_transfer(client->adapter, msgs, 2);//成功返回执行消息数,失败返回负//rxdata = (i2c_buf[0]<<8)|i2c_buf[1];rxdata = (i2c_buf[0]);return rxdata;
}/*******************************************************
Function:Write data to the i2c slave device.
Input:
Output:
*********************************************************/
void max92xx_i2c_write(struct i2c_client *client, int address, int data)
{u8 i2c_buf[8]; i2c_buf[0] = (address & 0xff00)>>8;i2c_buf[1] = (address & 0xff);i2c_buf[2] = data;// i2c_buf[3] = (data & 0xff00)>>8;// i2c_buf[4] = (data & 0xff);struct i2c_msg msg = {.flags = !I2C_M_RD,.addr = client->addr,.len = 3,.buf = i2c_buf,};i2c_transfer(client->adapter, &msg, 1);printk("write max92xx addr: 0x%4X  val:0x%4X\n", address, data);
}/*! Read one register from a max92xx i2c slave device.**   @param *reg        register in the device we wish to access.** @return               0 if success, an error code otherwise.*/
static inline int max92xx_read_reg(u8 reg)
{int val;val = i2c_smbus_read_byte_data(max92xx_data.i2c_client, reg);return val;}/*! Write one register of a max92xx i2c slave device.**  @param *reg        register in the device we wish to access.** @return               0 if success, an error code otherwise.*/
static int max92xx_write_reg(u8 reg, u8 val)
{s32 ret;ret = i2c_smbus_write_byte_data(max92xx_data.i2c_client, reg, val);if (ret < 0) {pr_err("%s:write reg error:reg=%2x,val=%2x\n", __func__,reg, val);}return ret;
}/*!* Maintains the information on the current state of the sensor.*/
static int max92xx_int(void)
{int ret = 0;printk("max9283_init start \n");max92xx_i2c_write(max92xx_data.i2c_client, 0x0010, 0x91);max92xx_i2c_write(max92xx_data.i2c_client, 0x0407, 0x20);max92xx_i2c_write(max92xx_data.i2c_client, 0x044D, 0x80);max92xx_i2c_write(max92xx_data.i2c_client, 0x0330, 0x80);max92xx_i2c_write(max92xx_data.i2c_client, 0x0331, 0x33);max92xx_i2c_write(max92xx_data.i2c_client, 0x005B, 0x10);max92xx_i2c_write(max92xx_data.i2c_client, 0x0053, 0x12);
//  max92xx_i2c_write(max92xx_data.i2c_client, 0x0308, 0x65);
//  max92xx_i2c_write(max92xx_data.i2c_client, 0x0332, 0x4E);max92xx_i2c_write(max92xx_data.i2c_client, 0x0333, 0xE4);
//  max92xx_i2c_write(max92xx_data.i2c_client, 0x0311, 0x50);max92xx_i2c_write(max92xx_data.i2c_client, 0x0415, 0x01);printk("max9283_init end \n");pr_debug("%s\n",__func__);return ret;
}static int max92xx_pattern_init(void)
{
//testint ret = 0;pr_debug("%s\n",__func__);//ret |= max92xx_write_reg(0x09 ,0x00);return ret;
}static int init_max92xx(void)
{
#if 1return max92xx_int();
#elsereturn max92xx_pattern_init();
#endif
}static bool check_chip_existence(void)
{
/*  if((max92xx_read_reg(0x0) == 0x35)&&(max92xx_read_reg(0x1) == 0x38)&&(max92xx_read_reg(0x2) == 0x49))return true;return false;*/return true;
}int max9283_enable(int enable)
{int ret = 0;if (enable){pr_debug("%s enter enable %d \n", __func__,enable);ret |= max92xx_write_reg(0x09, 0x01);ret |= max92xx_write_reg(0x0D, 0x01);msleep(10);ret |= max92xx_write_reg(0xE5, 0xFF);ret |= max92xx_write_reg(0xE0, 0x01);ret |= max92xx_write_reg(0xE1, 0xFF);}else{pr_debug("%s enter disable %d \n", __func__,enable);ret |= max92xx_write_reg(0x0D, 0x00);}return ret;
}
EXPORT_SYMBOL(max9283_enable);static ssize_t max92xx_reg_show(struct device *dev,struct device_attribute *attr, char *buf)
{int len;u16 i;len = sprintf(buf, "result\n");for(i = 0; i <= 0x4ff; i++){msleep(10);pr_err("runtime_max92xx: 0x%4X = 0x%2X\n", i, max92xx_i2c_read(max92xx_data.i2c_client,i));}return len;
}static ssize_t max92xx_reg_store(struct device *dev,struct device_attribute *attr, const char *buf, size_t count)
{int len;int addr, val;len = sscanf(buf, "0x%x 0x%x", (unsigned int *)&addr ,(unsigned int *)&val);pr_info("write max92xx addr: 0x%2X\tval:0x%2X\n", addr, val);max92xx_write_reg(addr, val);return count;
}static ssize_t max92xx_reg_single_store(struct device *dev,struct device_attribute *attr, const char *buf, size_t count)
{int len;int addr;len = sscanf(buf, "0x%x", (unsigned int *)&addr);pr_info("read max92xx addr: 0x%2X\tval:0x%2X\n", addr, max92xx_read_reg(addr));return count;
}static ssize_t max92xx_i2c_read_store(struct device *dev,struct device_attribute *attr, char *buf)
{int len;int addr;len = sscanf(buf, "0x%x", (unsigned int *)&addr);printk("read max92xx addr: 0x%4X  val:0x%4X\n", addr, max92xx_i2c_read(max92xx_data.i2c_client, addr));
}static ssize_t max92xx_i2c_write_store(struct device *dev,struct device_attribute *attr, const char *buf, size_t count)
{int len;int addr, val;len = sscanf(buf, "0x%x 0x%x", (unsigned int *)&addr ,(unsigned int *)&val);printk("write max92xx addr: 0x%4X  val:0x%4X\n", addr, val);max92xx_i2c_write(max92xx_data.i2c_client, addr, val);return count;
}static DEVICE_ATTR(reg, (0644), max92xx_reg_show, max92xx_reg_store);
static DEVICE_ATTR(reg_single, (0644), NULL, max92xx_reg_single_store);
static DEVICE_ATTR(max92xx_read_reg, (0644), NULL, max92xx_i2c_read_store);
static DEVICE_ATTR(max92xx_write_reg, (0644), NULL, max92xx_i2c_write_store);static struct attribute *max92xx_attributes[] = {&dev_attr_reg.attr,&dev_attr_reg_single.attr,&dev_attr_max92xx_read_reg.attr,&dev_attr_max92xx_write_reg.attr,NULL
};static struct attribute_group max92xx_attr_group = {.attrs = max92xx_attributes,
};static int max92xx_probe(struct i2c_client *client,const struct i2c_device_id *id)
{int retval = 0;int enable_gpio;static struct kobject *max92xx_kobj;max92xx_data.i2c_client = client;if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {dev_err(&client->dev, "I2C not supported\n");return -ENODEV;}if(check_chip_existence() == false){pr_err("%s:no chip is found\n", __func__);return -EIO;}else{pr_info("%s:chip is found\n", __func__);}printk("max9283 enable gpio_requeset\n");enable_gpio = of_get_named_gpio(client->dev.of_node, "qcom,max9283_enable-gpio",0); if (enable_gpio < 0)printk("max9283 enable gpio is not available \n");retval = gpio_request(enable_gpio,"max9283_enable");if(0 != retval) {printk("gpio request %d failed.\n",enable_gpio);}gpio_direction_output(enable_gpio,1);msleep(1000);retval = init_max92xx();if(retval != 0)return -EIO;max92xx_kobj = kobject_create_and_add("max9283", kernel_kobj);if(!max92xx_kobj)return -ENOMEM;retval = sysfs_create_group(max92xx_kobj, &max92xx_attr_group);if (retval) {kobject_put(max92xx_kobj);}return 0;
}static int max92xx_remove(struct i2c_client *client)
{return 0;
}/*!* max92xx init function.* Called on insmod.** @return    Error code indicating success or failure.*/
static __init int max92xx_init(void)
{u8 err = 0;/* Tells the i2c driver what functions to call for this driver. */err = i2c_add_driver(&max92xx_i2c_driver);if (err != 0)pr_err("%s:driver registration failed, error=%d\n",__func__, err);return err;
}/*!* max92xx cleanup function.* Called on rmmod.** @return     Error code indicating success or failure.*/
static void __exit max92xx_clean(void)
{i2c_del_driver(&max92xx_i2c_driver);
}module_init(max92xx_init);
module_exit(max92xx_clean);MODULE_AUTHOR("PATEO maze");
MODULE_DESCRIPTION("max92xx GMSL1 DSI Serializer/DESerializer driver");
MODULE_LICENSE("GPL");

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kernel:max92xx加串解串示例代码[可读取16位寄存器地址]

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