diff options
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/Makefile | 1 | ||||
| -rw-r--r-- | drivers/hwmon/ds620.c | 65 |
2 files changed, 66 insertions, 0 deletions
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index 25b8e8a..b4fb057 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -15,6 +15,7 @@ obj-$(CONFIG_DTT_ADT7460) += adt7460.o obj-$(CONFIG_DTT_DS1621) += ds1621.o obj-$(CONFIG_DTT_DS1722) += ds1722.o obj-$(CONFIG_DTT_DS1775) += ds1775.o +obj-$(CONFIG_DTT_DS620) += ds620.o obj-$(CONFIG_DTT_LM63) += lm63.o obj-$(CONFIG_DTT_LM73) += lm73.o obj-$(CONFIG_DTT_LM75) += lm75.o diff --git a/drivers/hwmon/ds620.c b/drivers/hwmon/ds620.c new file mode 100644 index 0000000..1ecc3da --- /dev/null +++ b/drivers/hwmon/ds620.c @@ -0,0 +1,65 @@ +/* + * DS620 DTT support + * + * (C) Copyright 2014 3ADEV <http://www.3adev.com> + * Written-by: Albert ARIBAUD <albert.aribaud@3adev.fr> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +/* + * Dallas Semiconductor's DS1621/1631 Digital Thermometer and Thermostat. + */ + +#include <common.h> +#include <i2c.h> +#include <dtt.h> + +/* + * Device code + */ +#define DTT_I2C_DEV_CODE 0x48 +#define DTT_START_CONVERT 0x51 +#define DTT_TEMP 0xAA +#define DTT_CONFIG 0xAC + +/* + * Config register MSB bits + */ +#define DTT_CONFIG_1SHOT 0x01 +#define DTT_CONFIG_AUTOC 0x02 +#define DTT_CONFIG_R0 0x04 /* always 1 */ +#define DTT_CONFIG_R1 0x08 /* always 1 */ +#define DTT_CONFIG_TLF 0x10 +#define DTT_CONFIG_THF 0x20 +#define DTT_CONFIG_NVB 0x40 +#define DTT_CONFIG_DONE 0x80 + +#define CHIP(sensor) (DTT_I2C_DEV_CODE + (sensor & 0x07)) + +int dtt_init_one(int sensor) +{ + uint8_t config = DTT_CONFIG_1SHOT + | DTT_CONFIG_R0 + | DTT_CONFIG_R1; + return i2c_write(CHIP(sensor), DTT_CONFIG, 1, &config, 1); +} + +int dtt_get_temp(int sensor) +{ + uint8_t status; + uint8_t temp[2]; + + /* Start a conversion, may take up to 1 second. */ + i2c_write(CHIP(sensor), DTT_START_CONVERT, 1, NULL, 0); + do { + if (i2c_read(CHIP(sensor), DTT_CONFIG, 1, &status, 1)) + /* bail out if I2C error */ + status |= DTT_CONFIG_DONE; + } while (!(status & DTT_CONFIG_DONE)); + if (i2c_read(CHIP(sensor), DTT_TEMP, 1, temp, 2)) + /* bail out if I2C error */ + return -274; /* below absolute zero == error */ + + return ((int16_t)(temp[1] | (temp[0] << 8))) >> 7; +} |