diff options
Diffstat (limited to 'driver/temp_sensor/oti502.c')
| -rw-r--r-- | driver/temp_sensor/oti502.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/driver/temp_sensor/oti502.c b/driver/temp_sensor/oti502.c new file mode 100644 index 0000000000..8a420363e8 --- /dev/null +++ b/driver/temp_sensor/oti502.c @@ -0,0 +1,67 @@ +/* Copyright 2019 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. + */ + +/* OTI502 temperature sensor module for Chrome EC */ + +#include "common.h" +#include "console.h" +#include "oti502.h" +#include "i2c.h" +#include "hooks.h" +#include "util.h" + +static int temp_val_ambient; /* Ambient is chip temperature*/ +static int temp_val_object; /* Object is IR temperature */ + +static int oti502_read_block(const int offset, uint8_t *data, int len) +{ + return i2c_read_block(I2C_PORT_THERMAL, OTI502_I2C_ADDR_FLAGS, + offset, data, len); +} + +int oti502_get_val(int idx, int *temp_ptr) +{ + switch (idx) { + case OTI502_IDX_AMBIENT: + *temp_ptr = temp_val_ambient; + break; + case OTI502_IDX_OBJECT: + *temp_ptr = temp_val_object; + break; + default: + return EC_ERROR_UNKNOWN; + } + + return EC_SUCCESS; +} + +static void temp_sensor_poll(void) +{ + uint8_t temp_val[6]; + + memset(temp_val, 0, sizeof(temp_val)); + + oti502_read_block(0x80, temp_val, sizeof(temp_val)); + + if (temp_val[2] >= 0x80) { + /* Treat temperature as 0 degree C if temperature is negative*/ + temp_val_ambient = 0; + ccprintf("Temperature ambient is negative !\n"); + } else { + temp_val_ambient = ((temp_val[1] << 8) + temp_val[0]) / 200; + temp_val_ambient = C_TO_K(temp_val_ambient); + } + + if (temp_val[5] >= 0x80) { + /* Treat temperature as 0 degree C if temperature is negative*/ + temp_val_object = 0; + ccprintf("Temperature object is negative !\n"); + } else { + temp_val_object = ((temp_val[4] << 8) + temp_val[5]) / 200; + temp_val_object = C_TO_K(temp_val_object); + } +} +DECLARE_HOOK(HOOK_SECOND, temp_sensor_poll, HOOK_PRIO_TEMP_SENSOR); + |