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bootloader/u-boot_2015_04/drivers/hwmon/lm75.c 3.07 KB
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  /*
   * (C) Copyright 2001
   * Bill Hunter,  Wave 7 Optics, williamhunter@mediaone.net
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  /*
   * On Semiconductor's LM75 Temperature Sensor
   */
  
  #include <common.h>
  #include <i2c.h>
  #include <dtt.h>
  
  /*
   * Device code
   */
  #if defined(CONFIG_SYS_I2C_DTT_ADDR)
  #define DTT_I2C_DEV_CODE CONFIG_SYS_I2C_DTT_ADDR
  #else
  #define DTT_I2C_DEV_CODE 0x48			/* ON Semi's LM75 device */
  #endif
  #define DTT_READ_TEMP		0x0
  #define DTT_CONFIG		0x1
  #define DTT_TEMP_HYST		0x2
  #define DTT_TEMP_SET		0x3
  
  int dtt_read(int sensor, int reg)
  {
  	int dlen;
  	uchar data[2];
  
  #ifdef CONFIG_DTT_AD7414
  	/*
  	 * On AD7414 the first value upon bootup is not read correctly.
  	 * This is most likely because of the 800ms update time of the
  	 * temp register in normal update mode. To get current values
  	 * each time we issue the "dtt" command including upon powerup
  	 * we switch into one-short mode.
  	 *
  	 * Issue one-shot mode command
  	 */
  	dtt_write(sensor, DTT_CONFIG, 0x64);
  #endif
  
  	/* Validate 'reg' param */
  	if((reg < 0) || (reg > 3))
  		return -1;
  
  	/* Calculate sensor address and register. */
  	sensor = DTT_I2C_DEV_CODE + (sensor & 0x07);
  
  	/* Prepare to handle 2 byte result. */
  	if ((reg == DTT_READ_TEMP) ||
  		(reg == DTT_TEMP_HYST) ||
  		(reg == DTT_TEMP_SET))
  			dlen = 2;
  	else
  		dlen = 1;
  
  	/* Now try to read the register. */
  	if (i2c_read(sensor, reg, 1, data, dlen) != 0)
  		return -1;
  
  	/* Handle 2 byte result. */
  	if (dlen == 2)
  		return ((int)((short)data[1] + (((short)data[0]) << 8)));
  
  	return (int)data[0];
  } /* dtt_read() */
  
  
  int dtt_write(int sensor, int reg, int val)
  {
  	int dlen;
  	uchar data[2];
  
  	/* Validate 'reg' param */
  	if ((reg < 0) || (reg > 3))
  		return 1;
  
  	/* Calculate sensor address and register. */
  	sensor = DTT_I2C_DEV_CODE + (sensor & 0x07);
  
  	/* Handle 2 byte values. */
  	if ((reg == DTT_READ_TEMP) ||
  		(reg == DTT_TEMP_HYST) ||
  		(reg == DTT_TEMP_SET)) {
  			dlen = 2;
  		data[0] = (char)((val >> 8) & 0xff);	/* MSB first */
  		data[1] = (char)(val & 0xff);
  	} else {
  		dlen = 1;
  		data[0] = (char)(val & 0xff);
  	}
  
  	/* Write value to register. */
  	if (i2c_write(sensor, reg, 1, data, dlen) != 0)
  		return 1;
  
  	return 0;
  } /* dtt_write() */
  
  
  int dtt_init_one(int sensor)
  {
  	int val;
  
  	/* Setup TSET ( trip point ) register */
  	val = ((CONFIG_SYS_DTT_MAX_TEMP * 2) << 7) & 0xff80; /* trip */
  	if (dtt_write(sensor, DTT_TEMP_SET, val) != 0)
  		return 1;
  
  	/* Setup THYST ( untrip point ) register - Hysteresis */
  	val = (((CONFIG_SYS_DTT_MAX_TEMP - CONFIG_SYS_DTT_HYSTERESIS) * 2) << 7) & 0xff80;
  	if (dtt_write(sensor, DTT_TEMP_HYST, val) != 0)
  		return 1;
  
  	/* Setup configuraton register */
  #ifdef CONFIG_DTT_AD7414
  	/* config = alert active low and disabled */
  	val = 0x60;
  #else
  	/* config = 6 sample integration, int mode, active low, and enable */
  	val = 0x18;
  #endif
  	if (dtt_write(sensor, DTT_CONFIG, val) != 0)
  		return 1;
  
  	return 0;
  } /* dtt_init_one() */
  
  int dtt_get_temp(int sensor)
  {
  	int const ret = dtt_read(sensor, DTT_READ_TEMP);
  
  	if (ret < 0) {
  		printf("DTT temperature read failed.
  ");
  		return 0;
  	}
  	return (int)((int16_t) ret / 256);
  } /* dtt_get_temp() */