425 lines
9.9 KiB
C
425 lines
9.9 KiB
C
/*
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* Copyright (c) 2021 Vestas Wind Systems A/S
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT lm77
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#include <zephyr/device.h>
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#include <zephyr/drivers/gpio.h>
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#include <zephyr/drivers/i2c.h>
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#include <zephyr/drivers/sensor.h>
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#include <zephyr/logging/log.h>
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#include <zephyr/pm/device.h>
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#include <zephyr/sys/byteorder.h>
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LOG_MODULE_REGISTER(lm77, CONFIG_SENSOR_LOG_LEVEL);
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/*
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* Only compile in trigger support if enabled in Kconfig and at least one
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* enabled lm77 devicetree node has the int-gpios property.
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*/
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#define LM77_TRIGGER_SUPPORT_INST(inst) DT_INST_NODE_HAS_PROP(inst, int_gpios) ||
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#define LM77_TRIGGER_SUPPORT \
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(CONFIG_LM77_TRIGGER && (DT_INST_FOREACH_STATUS_OKAY(LM77_TRIGGER_SUPPORT_INST) 0))
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/* LM77 registers */
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#define LM77_REG_TEMP 0x00U
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#define LM77_REG_CONFIG 0x01U
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#define LM77_REG_THYST 0x02U
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#define LM77_REG_TCRIT 0x03U
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#define LM77_REG_TLOW 0x04U
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#define LM77_REG_THIGH 0x05U
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/* LM77 configuration register bits */
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union lm77_reg_config {
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uint8_t reg;
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struct {
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uint8_t shutdown : 1;
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uint8_t int_mode : 1;
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uint8_t tcrita_pol : 1;
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uint8_t int_pol : 1;
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uint8_t fault_queue : 1;
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uint8_t reserved : 3;
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} __packed;
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};
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struct lm77_config {
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struct i2c_dt_spec i2c;
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union lm77_reg_config config_dt;
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#if LM77_TRIGGER_SUPPORT
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struct gpio_dt_spec int_gpio;
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#endif /* LM77_TRIGGER_SUPPORT */
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};
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struct lm77_data {
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int16_t temp;
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#if LM77_TRIGGER_SUPPORT
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const struct device *dev;
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struct k_work_q workq;
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struct k_work work;
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struct gpio_callback int_gpio_cb;
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const struct sensor_trigger *trigger;
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sensor_trigger_handler_t trigger_handler;
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K_KERNEL_STACK_MEMBER(stack, CONFIG_LM77_TRIGGER_THREAD_STACK_SIZE);
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#endif /* LM77_TRIGGER_SUPPORT */
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};
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static int lm77_write_config(const struct device *dev, uint8_t value)
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{
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const struct lm77_config *config = dev->config;
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uint8_t buf[2] = { LM77_REG_CONFIG, value };
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return i2c_write_dt(&config->i2c, buf, sizeof(buf));
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}
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static int lm77_read_temp(const struct device *dev, uint8_t reg, int16_t *value)
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{
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const struct lm77_config *config = dev->config;
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uint8_t buf[2];
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int err;
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err = i2c_write_read_dt(&config->i2c, ®, sizeof(reg), &buf, sizeof(buf));
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if (err < 0) {
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LOG_ERR("failed to read temperature register 0x%02x (err %d)", reg, err);
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return err;
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}
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*value = sys_get_be16(buf);
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return 0;
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}
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static int lm77_write_temp(const struct device *dev, uint8_t reg, int16_t value)
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{
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const struct lm77_config *config = dev->config;
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uint8_t buf[3] = { reg, value >> 8, value };
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return i2c_write_dt(&config->i2c, buf, sizeof(buf));
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}
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static void lm77_sensor_value_to_temp(const struct sensor_value *val, int16_t *temp)
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{
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/* Integer part in degrees Celsius (LSB = 0.5 degrees Celsius) */
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*temp = val->val1 << 1;
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/* Fractional part in micro degrees Celsius */
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*temp += (val->val2 * 2) / 1000000;
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/* Shift up to include "status" bits */
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*temp <<= 3;
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}
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static void lm77_temp_to_sensor_value(int16_t temp, struct sensor_value *val)
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{
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/* Shift down to remove "status" bits (LSB = 0.5 degrees Celsius) */
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temp = (temp >> 3) * 5;
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/* Integer part in degrees Celsius */
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val->val1 = temp / 10;
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/* Fractional part in micro degrees Celsius */
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val->val2 = temp % 10;
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val->val2 *= 100000;
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}
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static int lm77_attr_set(const struct device *dev, enum sensor_channel chan,
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enum sensor_attribute attr, const struct sensor_value *val)
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{
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int16_t temp = 0;
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uint8_t reg;
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int err;
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__ASSERT_NO_MSG(val != NULL);
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if (chan != SENSOR_CHAN_AMBIENT_TEMP) {
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return -ENOTSUP;
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}
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switch (attr) {
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case SENSOR_ATTR_LOWER_THRESH:
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reg = LM77_REG_TLOW;
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break;
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case SENSOR_ATTR_UPPER_THRESH:
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reg = LM77_REG_THIGH;
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break;
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case SENSOR_ATTR_ALERT:
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reg = LM77_REG_TCRIT;
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break;
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case SENSOR_ATTR_HYSTERESIS:
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reg = LM77_REG_THYST;
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break;
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default:
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return -ENOTSUP;
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}
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lm77_sensor_value_to_temp(val, &temp);
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err = lm77_write_temp(dev, reg, temp);
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if (err < 0) {
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LOG_ERR("failed to write register 0x%02x (err %d)", reg, err);
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return err;
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}
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return 0;
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}
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static int lm77_attr_get(const struct device *dev, enum sensor_channel chan,
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enum sensor_attribute attr, struct sensor_value *val)
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{
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int16_t temp;
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uint8_t reg;
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int err;
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__ASSERT_NO_MSG(val != NULL);
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if (chan != SENSOR_CHAN_AMBIENT_TEMP) {
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return -ENOTSUP;
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}
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switch (attr) {
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case SENSOR_ATTR_LOWER_THRESH:
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reg = LM77_REG_TLOW;
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break;
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case SENSOR_ATTR_UPPER_THRESH:
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reg = LM77_REG_THIGH;
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break;
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case SENSOR_ATTR_ALERT:
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reg = LM77_REG_TCRIT;
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break;
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case SENSOR_ATTR_HYSTERESIS:
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reg = LM77_REG_THYST;
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break;
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default:
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return -ENOTSUP;
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}
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err = lm77_read_temp(dev, reg, &temp);
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if (err < 0) {
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LOG_ERR("failed to read register 0x%02x (err %d)", reg, err);
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return err;
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}
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lm77_temp_to_sensor_value(temp, val);
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return 0;
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}
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#if LM77_TRIGGER_SUPPORT
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static int lm77_trigger_set(const struct device *dev, const struct sensor_trigger *trig,
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sensor_trigger_handler_t handler)
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{
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const struct lm77_config *config = dev->config;
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struct lm77_data *data = dev->data;
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gpio_flags_t flags;
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int err;
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__ASSERT_NO_MSG(trig != NULL);
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if (trig->type != SENSOR_TRIG_THRESHOLD || trig->chan != SENSOR_CHAN_AMBIENT_TEMP ||
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config->int_gpio.port == NULL) {
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return -ENOTSUP;
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}
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if (handler != NULL) {
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flags = GPIO_INT_EDGE_TO_ACTIVE;
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} else {
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flags = GPIO_INT_DISABLE;
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}
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err = gpio_pin_interrupt_configure_dt(&config->int_gpio, flags);
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if (err < 0) {
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LOG_ERR("failed to configure INT GPIO IRQ (err %d)", err);
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return err;
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}
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data->trigger = trig;
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data->trigger_handler = handler;
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return 0;
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}
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static void lm77_trigger_work_handler(struct k_work *item)
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{
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struct lm77_data *data = CONTAINER_OF(item, struct lm77_data, work);
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sensor_trigger_handler_t handler = data->trigger_handler;
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if (handler != NULL) {
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handler(data->dev, (struct sensor_trigger *)data->trigger);
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}
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}
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static void lm77_int_gpio_callback_handler(const struct device *port,
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struct gpio_callback *cb,
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gpio_port_pins_t pins)
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{
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struct lm77_data *data = CONTAINER_OF(cb, struct lm77_data, int_gpio_cb);
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ARG_UNUSED(port);
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ARG_UNUSED(pins);
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k_work_submit_to_queue(&data->workq, &data->work);
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}
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#endif /* LM77_TRIGGER_SUPPORT */
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static int lm77_sample_fetch(const struct device *dev, enum sensor_channel chan)
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{
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struct lm77_data *data = dev->data;
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int16_t temp;
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int err;
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if (chan != SENSOR_CHAN_ALL && chan != SENSOR_CHAN_AMBIENT_TEMP) {
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return -ENOTSUP;
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}
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err = lm77_read_temp(dev, LM77_REG_TEMP, &temp);
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if (err < 0) {
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LOG_ERR("failed to read temperature (err %d)", err);
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return err;
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}
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data->temp = temp;
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return 0;
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}
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static int lm77_channel_get(const struct device *dev, enum sensor_channel chan,
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struct sensor_value *val)
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{
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struct lm77_data *data = dev->data;
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if (chan != SENSOR_CHAN_AMBIENT_TEMP) {
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return -ENOTSUP;
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}
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lm77_temp_to_sensor_value(data->temp, val);
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return 0;
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}
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static const struct sensor_driver_api lm77_driver_api = {
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.attr_set = lm77_attr_set,
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.attr_get = lm77_attr_get,
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#if LM77_TRIGGER_SUPPORT
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.trigger_set = lm77_trigger_set,
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#endif /* LM77_TRIGGER_SUPPORT */
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.sample_fetch = lm77_sample_fetch,
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.channel_get = lm77_channel_get,
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};
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static int lm77_init(const struct device *dev)
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{
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const struct lm77_config *config = dev->config;
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int err;
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#if LM77_TRIGGER_SUPPORT
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struct lm77_data *data = dev->data;
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#endif /* LM77_TRIGGER_SUPPORT */
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if (!device_is_ready(config->i2c.bus)) {
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LOG_ERR("I2c bus not ready");
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return -EINVAL;
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}
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err = lm77_write_config(dev, config->config_dt.reg);
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if (err < 0) {
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LOG_ERR("failed to write configuration (err %d)", err);
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return err;
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}
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#if LM77_TRIGGER_SUPPORT
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data->dev = dev;
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k_work_queue_start(&data->workq, data->stack, K_THREAD_STACK_SIZEOF(data->stack),
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CONFIG_LM77_TRIGGER_THREAD_PRIO, NULL);
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k_thread_name_set(&data->workq.thread, "lm77_trigger");
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k_work_init(&data->work, lm77_trigger_work_handler);
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if (config->int_gpio.port != NULL) {
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if (!device_is_ready(config->int_gpio.port)) {
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LOG_ERR("INT GPIO not ready");
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return -EINVAL;
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}
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err = gpio_pin_configure_dt(&config->int_gpio, GPIO_INPUT);
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if (err < 0) {
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LOG_ERR("failed to configure INT GPIO (err %d)", err);
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return err;
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}
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gpio_init_callback(&data->int_gpio_cb, lm77_int_gpio_callback_handler,
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BIT(config->int_gpio.pin));
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err = gpio_add_callback(config->int_gpio.port, &data->int_gpio_cb);
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if (err < 0) {
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LOG_ERR("failed to add INT GPIO callback (err %d)", err);
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return err;
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}
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}
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#endif /* LM77_TRIGGER_SUPPORT */
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return 0;
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}
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#ifdef CONFIG_PM_DEVICE
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static int lm77_pm_action(const struct device *dev,
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enum pm_device_action action)
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{
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const struct lm77_config *config = dev->config;
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union lm77_reg_config creg = config->config_dt;
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int err;
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switch (action) {
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case PM_DEVICE_ACTION_SUSPEND:
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creg.shutdown = 1;
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break;
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case PM_DEVICE_ACTION_RESUME:
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creg.shutdown = 0;
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break;
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default:
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return -ENOTSUP;
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}
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err = lm77_write_config(dev, creg.reg);
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if (err < 0) {
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LOG_ERR("failed to write configuration (err %d)", err);
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return err;
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}
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return 0;
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}
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#endif /* CONFIG_PM_DEVICE */
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#if LM77_TRIGGER_SUPPORT
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#define LM77_INT_GPIO_INIT(n) .int_gpio = GPIO_DT_SPEC_INST_GET_OR(n, int_gpios, { 0 })
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#else /* LM77_TRIGGER_SUPPORT */
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#define LM77_INT_GPIO_INIT(n)
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#endif /* ! LM77_TRIGGER_SUPPORT */
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#define LM77_INIT(n) \
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static struct lm77_data lm77_data_##n; \
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\
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static const struct lm77_config lm77_config_##n = { \
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.i2c = I2C_DT_SPEC_INST_GET(n), \
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.config_dt = { \
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.shutdown = 0, \
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.int_mode = DT_INST_NODE_HAS_PROP(n, int_gpios), \
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.tcrita_pol = DT_INST_PROP(n, tcrita_inverted), \
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.int_pol = DT_INST_PROP(n, int_inverted), \
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.fault_queue = DT_INST_PROP(n, enable_fault_queue), \
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.reserved = 0, \
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}, \
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LM77_INT_GPIO_INIT(n) \
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}; \
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\
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PM_DEVICE_DT_INST_DEFINE(n, lm77_pm_action); \
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\
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DEVICE_DT_INST_DEFINE(n, lm77_init, \
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PM_DEVICE_DT_INST_GET(n), \
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&lm77_data_##n, \
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&lm77_config_##n, POST_KERNEL, \
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CONFIG_SENSOR_INIT_PRIORITY, \
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&lm77_driver_api);
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DT_INST_FOREACH_STATUS_OKAY(LM77_INIT)
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