138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
/* sensor_sx9500.c - Driver for Semtech SX9500 SAR proximity chip */
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/*
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* Copyright (c) 2016 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <errno.h>
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#include <kernel.h>
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#include <i2c.h>
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#include <sensor.h>
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#include <init.h>
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#include <gpio.h>
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#include <misc/__assert.h>
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#include "sx9500.h"
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static u8_t sx9500_reg_defaults[] = {
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/*
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* First number is register address to write to. The chip
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* auto-increments the address for subsequent values in a single
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* write message.
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*/
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SX9500_REG_PROX_CTRL1,
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0x43, /* Shield enabled, small range. */
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0x77, /* x8 gain, 167kHz frequency, finest resolution. */
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0x40, /* Doze enabled, 2x scan period doze, no raw filter. */
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0x30, /* Average threshold. */
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0x0f, /* Debouncer off, lowest average negative filter,
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* highest average postive filter.
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*/
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0x0e, /* Proximity detection threshold: 280 */
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0x00, /* No automatic compensation, compensate each pin
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* independently, proximity hysteresis: 32, close
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* debouncer off, far debouncer off.
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*/
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0x00, /* No stuck timeout, no periodic compensation. */
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};
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static int sx9500_sample_fetch(struct device *dev, enum sensor_channel chan)
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{
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struct sx9500_data *data = (struct sx9500_data *) dev->driver_data;
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__ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL || chan == SENSOR_CHAN_PROX);
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return i2c_reg_read_byte(data->i2c_master, data->i2c_slave_addr,
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SX9500_REG_STAT, &data->prox_stat);
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}
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static int sx9500_channel_get(struct device *dev,
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enum sensor_channel chan,
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struct sensor_value *val)
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{
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struct sx9500_data *data = (struct sx9500_data *) dev->driver_data;
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__ASSERT_NO_MSG(chan == SENSOR_CHAN_PROX);
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val->val1 = !!(data->prox_stat &
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(1 << (4 + CONFIG_SX9500_PROX_CHANNEL)));
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val->val2 = 0;
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return 0;
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}
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static const struct sensor_driver_api sx9500_api_funcs = {
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.sample_fetch = sx9500_sample_fetch,
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.channel_get = sx9500_channel_get,
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#ifdef CONFIG_SX9500_TRIGGER
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.trigger_set = sx9500_trigger_set,
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#endif
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};
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static int sx9500_init_chip(struct device *dev)
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{
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struct sx9500_data *data = (struct sx9500_data *) dev->driver_data;
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u8_t val;
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if (i2c_write(data->i2c_master, sx9500_reg_defaults,
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sizeof(sx9500_reg_defaults), data->i2c_slave_addr)
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< 0) {
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return -EIO;
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}
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/* No interrupts active. We only activate them when an
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* application registers a trigger.
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*/
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if (i2c_reg_write_byte(data->i2c_master, data->i2c_slave_addr,
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SX9500_REG_IRQ_MSK, 0) < 0) {
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return -EIO;
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}
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/* Read irq source reg to clear reset status. */
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if (i2c_reg_read_byte(data->i2c_master, data->i2c_slave_addr,
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SX9500_REG_IRQ_SRC, &val) < 0) {
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return -EIO;
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}
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return i2c_reg_write_byte(data->i2c_master, data->i2c_slave_addr,
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SX9500_REG_PROX_CTRL0,
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1 << CONFIG_SX9500_PROX_CHANNEL);
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}
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int sx9500_init(struct device *dev)
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{
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struct sx9500_data *data = dev->driver_data;
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data->i2c_master = device_get_binding(CONFIG_SX9500_I2C_DEV_NAME);
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if (!data->i2c_master) {
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SYS_LOG_DBG("sx9500: i2c master not found: %s",
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CONFIG_SX9500_I2C_DEV_NAME);
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return -EINVAL;
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}
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data->i2c_slave_addr = CONFIG_SX9500_I2C_ADDR;
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if (sx9500_init_chip(dev) < 0) {
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SYS_LOG_DBG("sx9500: failed to initialize chip");
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return -EINVAL;
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}
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if (sx9500_setup_interrupt(dev) < 0) {
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SYS_LOG_DBG("sx9500: failed to setup interrupt");
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return -EINVAL;
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}
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dev->driver_api = &sx9500_api_funcs;
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return 0;
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}
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struct sx9500_data sx9500_data;
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DEVICE_INIT(sx9500, CONFIG_SX9500_DEV_NAME, sx9500_init, &sx9500_data,
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NULL, POST_KERNEL, CONFIG_SENSOR_INIT_PRIORITY);
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