diff options
-rw-r--r-- | driver/build.mk | 1 | ||||
-rw-r--r-- | driver/temp_sensor/tmp112.c | 82 | ||||
-rw-r--r-- | driver/temp_sensor/tmp112.h | 29 |
3 files changed, 112 insertions, 0 deletions
diff --git a/driver/build.mk b/driver/build.mk index 43f68502ea..aab87ee035 100644 --- a/driver/build.mk +++ b/driver/build.mk @@ -74,6 +74,7 @@ driver-$(CONFIG_TEMP_SENSOR_G781)+=temp_sensor/g78x.o driver-$(CONFIG_TEMP_SENSOR_G782)+=temp_sensor/g78x.o driver-$(CONFIG_TEMP_SENSOR_TMP006)+=temp_sensor/tmp006.o driver-$(CONFIG_TEMP_SENSOR_TMP432)+=temp_sensor/tmp432.o +driver-$(CONFIG_TEMP_SENSOR_TMP112)+=temp_sensor/tmp112.o # Touchpads driver-$(CONFIG_TOUCHPAD_ELAN)+=touchpad_elan.o diff --git a/driver/temp_sensor/tmp112.c b/driver/temp_sensor/tmp112.c new file mode 100644 index 0000000000..f567e2433c --- /dev/null +++ b/driver/temp_sensor/tmp112.c @@ -0,0 +1,82 @@ +/* Copyright (c) 2016 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +/* TMP112 temperature sensor module for Chrome EC */ + +#include "common.h" +#include "console.h" +#include "tmp112.h" +#include "i2c.h" +#include "hooks.h" +#include "util.h" + +#define TMP112_RESOLUTION 12 +#define TMP112_SHIFT1 (16 - TMP112_RESOLUTION) +#define TMP112_SHIFT2 (TMP112_RESOLUTION - 8) + +static int temp_val_local; + +static int raw_read16(const int offset, int *data_ptr) +{ + return i2c_read16(I2C_PORT_THERMAL, TMP112_I2C_ADDR, offset, data_ptr); +} + +static int raw_write16(const int offset, int data) +{ + return i2c_write16(I2C_PORT_THERMAL, TMP112_I2C_ADDR, offset, data); +} + +static int get_temp(int *temp_ptr) +{ + int rv; + int temp_raw = 0; + + rv = raw_read16(TMP112_REG_TEMP, &temp_raw); + if (rv < 0) + return rv; + + *temp_ptr = (int)(int16_t)temp_raw; + return EC_SUCCESS; +} + +static inline int tmp112_reg_to_c(int16_t reg) +{ + int tmp; + + tmp = (((reg >> TMP112_SHIFT1) * 1000 ) >> TMP112_SHIFT2); + + return tmp / 1000; +} + +int tmp112_get_val(int idx, int *temp_ptr) +{ + *temp_ptr = temp_val_local; + return EC_SUCCESS; +} + +static void tmp112_poll(void) +{ + int temp_c = 0; + + if (get_temp(&temp_c) == EC_SUCCESS) + temp_val_local = C_TO_K(tmp112_reg_to_c(temp_c)); +} +DECLARE_HOOK(HOOK_SECOND, tmp112_poll, HOOK_PRIO_TEMP_SENSOR); + +static void tmp112_init(void) +{ + int tmp; + int set_mask, clr_mask; + + /* 12 bit mode */ + set_mask = (3 << 5); + + /* not oneshot mode */ + clr_mask = (1 << 7); + + raw_read16(TMP112_REG_CONF, &tmp); + raw_write16(TMP112_REG_CONF, (tmp & ~clr_mask) | set_mask); +} +DECLARE_HOOK(HOOK_INIT, tmp112_init, HOOK_PRIO_DEFAULT); diff --git a/driver/temp_sensor/tmp112.h b/driver/temp_sensor/tmp112.h new file mode 100644 index 0000000000..14ee56da0c --- /dev/null +++ b/driver/temp_sensor/tmp112.h @@ -0,0 +1,29 @@ +/* Copyright (c) 2016 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#ifndef __CROS_EC_TMP112_H +#define __CROS_EC_TMP112_H + +#include "i2c.h" + +#define TMP112_I2C_ADDR 0x90 | I2C_FLAG_BIG_ENDIAN + +#define TMP112_REG_TEMP 0x00 +#define TMP112_REG_CONF 0x01 +#define TMP112_REG_HYST 0x02 +#define TMP112_REG_MAX 0x03 + +/** + * Get the last polled value of a sensor. + * + * @param idx Index to read. (Ignored) + * + * @param temp_ptr Destination for temperature in K. + * + * @return EC_SUCCESS if successful, non-zero if error. + */ +int tmp112_get_val(int idx, int *temp_ptr); + +#endif /* __CROS_EC_TMP112_H */ |