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/* sensor_mcp9808_trigger.c - Trigger support for MCP9808 */
/*
* Copyright (c) 2016 Intel Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <errno.h>
#include <kernel.h>
#include <i2c.h>
#include <misc/byteorder.h>
#include <misc/__assert.h>
#include "mcp9808.h"
static int mcp9808_reg_write(struct mcp9808_data *data, uint8_t reg, uint16_t val)
{
uint16_t be_val = sys_cpu_to_be16(val);
struct i2c_msg msgs[2] = {
{
.buf = ®,
.len = 1,
.flags = I2C_MSG_WRITE | I2C_MSG_RESTART,
},
{
.buf = (uint8_t *) &be_val,
.len = 2,
.flags = I2C_MSG_WRITE | I2C_MSG_STOP,
},
};
return i2c_transfer(data->i2c_master, msgs, 2, data->i2c_slave_addr);
}
static int mcp9808_reg_update(struct mcp9808_data *data, uint8_t reg,
uint16_t mask, uint16_t val)
{
uint16_t old_val, new_val;
if (mcp9808_reg_read(data, reg, &old_val) < 0) {
return -EIO;
}
new_val = old_val & ~mask;
new_val |= val;
if (new_val == old_val) {
return 0;
}
return mcp9808_reg_write(data, reg, new_val);
}
int mcp9808_attr_set(struct device *dev, enum sensor_channel chan,
enum sensor_attribute attr,
const struct sensor_value *val)
{
struct mcp9808_data *data = dev->driver_data;
uint16_t reg_val = 0;
uint8_t reg_addr;
int32_t val2;
__ASSERT_NO_MSG(chan == SENSOR_CHAN_TEMP);
val2 = val->val2;
while (val2 > 0) {
reg_val += (1 << 2);
val2 -= 250000;
}
reg_val |= val->val1 << 4;
switch (attr) {
case SENSOR_ATTR_LOWER_THRESH:
reg_addr = MCP9808_REG_LOWER_LIMIT;
break;
case SENSOR_ATTR_UPPER_THRESH:
reg_addr = MCP9808_REG_UPPER_LIMIT;
break;
default:
return -EINVAL;
}
return mcp9808_reg_write(data, reg_addr, reg_val);
}
int mcp9808_trigger_set(struct device *dev,
const struct sensor_trigger *trig,
sensor_trigger_handler_t handler)
{
struct mcp9808_data *data = dev->driver_data;
data->trig = *trig;
data->trigger_handler = handler;
return mcp9808_reg_update(data, MCP9808_REG_CONFIG, MCP9808_ALERT_CNT,
handler == NULL ? 0 : MCP9808_ALERT_CNT);
}
#ifdef CONFIG_MCP9808_TRIGGER_OWN_THREAD
static void mcp9808_gpio_cb(struct device *dev,
struct gpio_callback *cb, uint32_t pins)
{
struct mcp9808_data *data =
CONTAINER_OF(cb, struct mcp9808_data, gpio_cb);
ARG_UNUSED(pins);
k_sem_give(&data->sem);
}
static void mcp9808_thread_main(int arg1, int arg2)
{
struct device *dev = INT_TO_POINTER(arg1);
struct mcp9808_data *data = dev->driver_data;
ARG_UNUSED(arg2);
while (1) {
k_sem_take(&data->sem, K_FOREVER);
data->trigger_handler(dev, &data->trig);
mcp9808_reg_update(data, MCP9808_REG_CONFIG,
MCP9808_INT_CLEAR, MCP9808_INT_CLEAR);
}
}
static char __stack mcp9808_thread_stack[CONFIG_MCP9808_THREAD_STACK_SIZE];
#else /* CONFIG_MCP9808_TRIGGER_GLOBAL_THREAD */
static void mcp9808_gpio_cb(struct device *dev,
struct gpio_callback *cb, uint32_t pins)
{
struct mcp9808_data *data =
CONTAINER_OF(cb, struct mcp9808_data, gpio_cb);
ARG_UNUSED(pins);
k_work_submit(&data->work);
}
static void mcp9808_gpio_thread_cb(struct k_work *work)
{
struct mcp9808_data *data =
CONTAINER_OF(work, struct mcp9808_data, work);
struct device *dev = data->dev;
data->trigger_handler(dev, &data->trig);
mcp9808_reg_update(data, MCP9808_REG_CONFIG,
MCP9808_INT_CLEAR, MCP9808_INT_CLEAR);
}
#endif /* CONFIG_MCP9808_TRIGGER_GLOBAL_THREAD */
void mcp9808_setup_interrupt(struct device *dev)
{
struct mcp9808_data *data = dev->driver_data;
struct device *gpio;
mcp9808_reg_update(data, MCP9808_REG_CONFIG, MCP9808_ALERT_INT,
MCP9808_ALERT_INT);
mcp9808_reg_write(data, MCP9808_REG_CRITICAL, MCP9808_TEMP_MAX);
mcp9808_reg_update(data, MCP9808_REG_CONFIG, MCP9808_INT_CLEAR,
MCP9808_INT_CLEAR);
#ifdef CONFIG_MCP9808_TRIGGER_OWN_THREAD
k_sem_init(&data->sem, 0, UINT_MAX);
k_thread_spawn(mcp9808_thread_stack,
CONFIG_MCP9808_THREAD_STACK_SIZE,
mcp9808_thread_main, POINTER_TO_INT(dev), 0, NULL,
K_PRIO_COOP(CONFIG_MCP9808_THREAD_PRIORITY), 0, 0);
#else /* CONFIG_MCP9808_TRIGGER_GLOBAL_THREAD */
data->work.handler = mcp9808_gpio_thread_cb;
data->dev = dev;
#endif
gpio = device_get_binding(CONFIG_MCP9808_GPIO_CONTROLLER);
gpio_pin_configure(gpio, CONFIG_MCP9808_GPIO_PIN,
GPIO_DIR_IN | GPIO_INT | GPIO_INT_EDGE |
GPIO_INT_ACTIVE_LOW | GPIO_INT_DEBOUNCE);
gpio_init_callback(&data->gpio_cb,
mcp9808_gpio_cb,
BIT(CONFIG_MCP9808_GPIO_PIN));
gpio_add_callback(gpio, &data->gpio_cb);
gpio_pin_enable_callback(gpio, CONFIG_MCP9808_GPIO_PIN);
}
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