/* drivers/input/sensors/temperature/tmp_ms5607.c
*
- This software is licensed under the terms of the GNU General Public
- License version 2, as published by the Free Software Foundation, and
- may be copied, distributed, and modified under those terms.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
*/
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/miscdevice.h>
#include <linux/gpio.h>
#include <linux/uaccess.h>
#include <asm/atomic.h>
#include <linux/delay.h>
#include <linux/input.h>
#include <linux/workqueue.h>
#include <linux/freezer.h>
#include <linux/of_gpio.h>
#ifdef CONFIG_HAS_EARLYSUSPEND
#include <linux/earlysuspend.h>
#endif
#include <linux/sensor-dev.h>
#define CMD_RESET 0x1E // ADC reset command
#define CMD_ADC_READ 0x00 // ADC read command
#define CMD_ADC_CONV 0x40 // ADC conversion command
#define CMD_ADC_D1 0x00 // ADC D1 conversion
#define CMD_ADC_D2 0x10 // ADC D2 conversion
#define CMD_ADC_256 0x00 // ADC OSR=256
#define CMD_ADC_512 0x02 // ADC OSR=512
#define CMD_ADC_1024 0x04 // ADC OSR=1024
#define CMD_ADC_2048 0x06 // ADC OSR=2048
#define CMD_ADC_4096 0x08 // ADC OSR=4096
#define CMD_PROM_RD 0xA0 // Prom read command
#if defined(CONFIG_PR_MS5607)
extern int g_ms5607_temp;
extern int g_ms5607_pr_status;
#else
static int g_ms5607_temp = 0;
static int g_ms5607_pr_status = SENSOR_OFF;
#endif
int g_ms5607_temp_status;
static int C[8] = {0};
/****operate according to sensor chip:start/
static int sensor_active(struct i2c_client *client, int enable, int rate)
{
int result = 0;
int i = 0;
char prom[16];
if((enable)&&(g_ms5607_pr_status == SENSOR_OFF))
{
result = sensor_write_reg_normal(client, CMD_RESET);
if(result)
printk("%s:line=%d,error\n",__func__,__LINE__);
//Read PROM (128 bit of calibration words)
memset(prom, 0, 16);
prom[0]= CMD_PROM_RD;//CMD_PROM_RD;
for(i=0; i<8; i++)
{
prom[i*2]= CMD_PROM_RD + i*2;
result = sensor_rx_data(client, &prom[i*2], 2);
if(result)
{
printk("%s:line=%d,error\n",__func__,__LINE__);
return result;
}
}
for (i=0;i<8;i++)
{
C[i] = prom[2*i] << 8 | prom[2*i + 1];
//printk("prom[%d]=0x%x,prom[%d]=0x%x",2*i,prom[2*i],(2*i + 1),prom[2*i + 1]);
//printk("\nC[%d]=%d,",i+1,C[i]);
}
}
g_ms5607_temp_status = enable;
return result;
}
static int sensor_init(struct i2c_client *client)
{
struct sensor_private_data *sensor =
(struct sensor_private_data *) i2c_get_clientdata(client);
int result = 0;
result = sensor->ops->active(client,0,0);
if(result)
{
printk("%s:line=%d,error\n",__func__,__LINE__);
return result;
}
sensor->status_cur = SENSOR_OFF;
g_ms5607_temp_status = sensor->status_cur;
//Reset
//result = sensor_write_reg_normal(client, CMD_RESET);
//if(result)
//printk("%s:line=%d,error\n",__func__,__LINE__);
return result;
}
static int temperature_report_value(struct input_dev *input, int data)
{
//get temperature, high and temperature from register data
input_report_abs(input, ABS_THROTTLE, data);
input_sync(input);
return 0;
}
static int sensor_report_value(struct i2c_client *client)
{
struct sensor_private_data *sensor =
(struct sensor_private_data *) i2c_get_clientdata(client);
int result = 0;
char buffer[3];
char index = 0;
unsigned int D1=0, D2=0;
int T2 = 0;
long long OFF = 0; // offset at actual temperature
long long SENS = 0; // sensitivity at actual temperature
int dT = 0; // difference between actual and measured temperature
long long OFF2 = 0;
long long SENS2 = 0;
int P = 0; // compensated pressure value
memset(buffer, 0, 3);
if(sensor->ops->read_len < 3) //sensor->ops->read_len = 3
{
printk("%s:lenth is error,len=%d\n",__func__,sensor->ops->read_len);
return -1;
}
if(g_ms5607_pr_status == SENSOR_OFF)
{
//D1 conversion
sensor_write_reg_normal(client, CMD_ADC_CONV + CMD_ADC_D1 + CMD_ADC_4096);
msleep(10);
memset(buffer, 0, 3);
buffer[0] = CMD_ADC_READ;
result = sensor_rx_data(client, &buffer[0], 3);
if(result)
{
printk("%s:line=%d,error\n",__func__,__LINE__);
return result;
}
D1 = (buffer[0] << 16) | (buffer[1] << 8) | buffer[2];
DBG("\nD1=%d :buffer[0]=0x%x,buffer[1]=0x%x,buffer2]=0x%x\n",D1,buffer[0],buffer[1],buffer[2]);
//D2 conversion
sensor_write_reg_normal(client, CMD_ADC_CONV + CMD_ADC_D2 + CMD_ADC_4096);
msleep(10);
memset(buffer, 0, 3);
buffer[0] = CMD_ADC_READ;
result = sensor_rx_data(client, &buffer[0], 3);
if(result)
{
printk("%s:line=%d,error\n",__func__,__LINE__);
return result;
}
D2 = (buffer[0] << 16) | (buffer[1] << 8) | buffer[2];
DBG("D2=%d:buffer[0]=0x%x,buffer[1]=0x%x,buffer2]=0x%x\n",D2,buffer[0],buffer[1],buffer[2]);
dT = D2 - ((unsigned int)C[5] << 8);
g_ms5607_temp = (int)(2000 + ((long long)dT * C[6] >> 23));
OFF = ((unsigned long long)C[2] << 17) + (C[4] * (long long)dT >> 6);
SENS = ((long long)C[1] << 16) + (C[3] * (long long)dT >> 7);
/*calcualte 2nd order pressure and temperature (BP5607 2nd order algorithm)*/
if (g_ms5607_temp < -4000 || g_ms5607_temp > 8500)
{
printk("%s:temperature is error\n",__func__);
return -1;
}
if (g_ms5607_temp < 2000)
{
int tmp;
tmp = (g_ms5607_temp - 2000) * (g_ms5607_temp - 2000);
T2 = (int)((long long)(dT * dT) >> 31);
OFF2 = (((long long)tmp * 61)*((long long)tmp * 61)) >> 4;
SENS2 = (long long)((tmp*tmp) << 1);
if (g_ms5607_temp < -1500)
{
tmp = (g_ms5607_temp + 1500) * (g_ms5607_temp + 1500);
OFF2 += 15 * tmp;
SENS2 += 8 * tmp;
}
}
else
{
T2=0;
OFF2 = 0;
SENS2 = 0;
}
g_ms5607_temp -= T2;
OFF -= OFF2;
SENS -= SENS2;
P = (int)((((D1 * SENS) >> 21) - OFF) >> 15);
index = temperature_report_value(sensor->input_dev, g_ms5607_temp);
DBG("%s:pressure=%d,temperature=%d\n",__func__,P,g_ms5607_temp);
}
else
{
index = temperature_report_value(sensor->input_dev, g_ms5607_temp);
#if defined(CONFIG_PR_MS5607)
DBG("%s:pressure=%d,temperature=%d\n",__func__,P,g_ms5607_temp);
#else
printk("%s:errror,need pr_ms5607\n",__func__);
#endif
}
return result;
}
struct sensor_operate temperature_ms5607_ops = {
.name = "tmp_ms5607",
.type = SENSOR_TYPE_TEMPERATURE, //sensor type and it should be correct
.id_i2c = TEMPERATURE_ID_MS5607, //i2c id number
.read_reg = SENSOR_UNKNOW_DATA, //read data
.read_len = 3, //data length
.id_reg = SENSOR_UNKNOW_DATA, //read device id from this register
.id_data = SENSOR_UNKNOW_DATA, //device id
.precision = 24, //8 bits
.ctrl_reg = SENSOR_UNKNOW_DATA, //enable or disable
.int_status_reg = SENSOR_UNKNOW_DATA, //intterupt status register
.range = {100,65535}, //range
.trig = IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
.active = sensor_active,
.init = sensor_init,
.report = sensor_report_value,
};
/****operate according to sensor chip:end /
static int temperature_ms5607_probe(struct i2c_client *client, const struct i2c_device_id *devid)
{
return sensor_register_device(client, NULL, devid, &temperature_ms5607_ops);
}
static int temperature_ms5607_remove(struct i2c_client *client)
{
return sensor_unregister_device(client, NULL, &temperature_ms5607_ops);
}
static const struct i2c_device_id temperature_ms5607_id[] = {
{"tmp_ms5607", TEMPERATURE_ID_MS5607},
{}
};
static struct i2c_driver temperature_ms5607_driver = {
.probe = temperature_ms5607_probe,
.remove = temperature_ms5607_remove,
.shutdown = sensor_shutdown,
.id_table = temperature_ms5607_id,
.driver = {
.name = "temperature_ms5607",
#ifdef CONFIG_PM
.pm = &sensor_pm_ops,
#endif
},
};
module_i2c_driver(temperature_ms5607_driver);
MODULE_AUTHOR("xxx");
MODULE_DESCRIPTION("ms5607 temperature driver");
MODULE_LICENSE("GPL");