1 /* 2 * Copyright 2023 Daniel DeGrasse <daniel@degrasse.com> 3 * 4 * SPDX-License-Identifier: Apache-2.0 5 */ 6 7 #ifndef _DRIVERS_SENSOR_TCN75A_H_ 8 #define _DRIVERS_SENSOR_TCN75A_H_ 9 10 #include <zephyr/drivers/gpio.h> 11 #include <zephyr/drivers/i2c.h> 12 #include <zephyr/drivers/sensor.h> 13 #include <zephyr/sys/byteorder.h> 14 15 #define TCN75A_TEMP_REG 0x0 16 #define TCN75A_CONFIG_REG 0x1 17 #define TCN75A_THYST_REG 0x2 18 #define TCN75A_TSET_REG 0x3 19 20 /* TCN75A TEMP register constants */ 21 #define TCN75A_TEMP_MSB_POS 8 22 #define TCN75A_TEMP_MSB_MASK 0xFF00 23 #define TCN75A_TEMP_LSB_MASK 0xFF 24 #define TCN75A_TEMP_LSB_POS 0 25 26 /* TCN75A CONFIG register constants */ 27 #define TCN75A_CONFIG_ONEDOWN BIT(7) 28 #define TCN75A_CONFIG_RES(x) (((x) & 0x3) << 5) 29 #define TCN75A_CONFIG_INT_EN 0x2 30 #define TCN75A_CONFIG_SHUTDOWN 0x1 31 32 struct tcn75a_config { 33 struct i2c_dt_spec i2c_spec; 34 bool oneshot_mode; 35 uint8_t resolution; 36 #ifdef CONFIG_TCN75A_TRIGGER 37 struct gpio_dt_spec alert_gpios; 38 #endif 39 }; 40 41 struct tcn75a_data { 42 uint16_t temp_sample; 43 #ifdef CONFIG_TCN75A_TRIGGER 44 const struct device *dev; 45 struct gpio_callback gpio_cb; 46 sensor_trigger_handler_t sensor_cb; 47 const struct sensor_trigger *sensor_trig; 48 #endif 49 #ifdef CONFIG_TCN75A_TRIGGER_GLOBAL_THREAD 50 struct k_work work; 51 #endif 52 #ifdef CONFIG_TCN75A_TRIGGER_OWN_THREAD 53 K_KERNEL_STACK_MEMBER(thread_stack, CONFIG_TCN75A_THREAD_STACK_SIZE); 54 struct k_thread thread; 55 struct k_sem trig_sem; 56 #endif 57 }; 58 59 /* Helpers to convert from TCN75A temperature fixed point format 60 * to sensor val2 format. When the LSB of the TCN75A temperature sample 61 * is treated as an integer, the format to convert to sensor val2 is 62 * FIXED_POINT_VAL * 3906.25 63 */ 64 #define TCN75A_FIXED_PT_TO_SENSOR(x) (((x)*3906) + ((x) >> 2)) 65 /* This conversion is imprecise, but because the 4 least significant bits 66 * of the temperature register aren't used, it doesn't matter. 67 */ 68 #define TCN75A_SENSOR_TO_FIXED_PT(x) ((x) / 3906) 69 70 #ifdef CONFIG_TCN75A_TRIGGER 71 72 int tcn75a_trigger_init(const struct device *dev); 73 int tcn75a_attr_get(const struct device *dev, enum sensor_channel chan, enum sensor_attribute attr, 74 struct sensor_value *val); 75 76 int tcn75a_attr_set(const struct device *dev, enum sensor_channel chan, enum sensor_attribute attr, 77 const struct sensor_value *val); 78 int tcn75a_trigger_set(const struct device *dev, const struct sensor_trigger *trig, 79 sensor_trigger_handler_t handler); 80 #endif 81 int tcn75a_sample_fetch(const struct device *dev, enum sensor_channel chan); 82 83 #endif /* _DRIVERS_SENSOR_TCN75A_H_ */ 84
