mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 08:57:58 +00:00
1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
143 lines
3.1 KiB
C
143 lines
3.1 KiB
C
/*
|
|
* (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.\n");
|
|
return 0;
|
|
}
|
|
return (int)((int16_t) ret / 256);
|
|
} /* dtt_get_temp() */
|