blob: eb0b7c10458c670ee1df6e41053a1b16bb5457e8 [file] [log] [blame]
/*
* Copyright (c) 2020 Matija Tudan
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr.h>
#include <kernel.h>
#include <drivers/i2c.h>
#include <drivers/dac.h>
#include <sys/util.h>
#include <sys/byteorder.h>
#include <sys/__assert.h>
#include <logging/log.h>
LOG_MODULE_REGISTER(dac_dacx3608, CONFIG_DAC_LOG_LEVEL);
/* Register addresses */
#define DACX3608_REG_DEVICE_CONFIG 0x01U
#define DACX3608_REG_STATUS_TRIGGER 0x02U
#define DACX3608_REG_BRDCAST 0x03U
#define DACX3608_REG_DACA_DATA 0x08U
#define DAC43608_DEVICE_ID 0x500 /* STATUS_TRIGGER[DEVICE_ID] */
#define DAC53608_DEVICE_ID 0x300 /* STATUS_TRIGGER[DEVICE_ID] */
#define DACX3608_SW_RST 0x0A /* STATUS_TRIGGER[SW_RST] */
#define DACX3608_POR_DELAY 5
#define DACX3608_MAX_CHANNEL 8
struct dacx3608_config {
const char *i2c_bus;
uint16_t i2c_addr;
uint8_t resolution;
};
struct dacx3608_data {
const struct device *i2c;
uint8_t configured;
};
static int dacx3608_reg_read(const struct device *dev, uint8_t reg,
uint16_t *val)
{
struct dacx3608_data *data = dev->data;
const struct dacx3608_config *cfg = dev->config;
if (i2c_burst_read(data->i2c, cfg->i2c_addr,
reg, (uint8_t *) val, 2) < 0) {
LOG_ERR("I2C read failed");
return -EIO;
}
*val = sys_be16_to_cpu(*val);
return 0;
}
static int dacx3608_reg_write(const struct device *dev, uint8_t reg,
uint16_t val)
{
struct dacx3608_data *data = dev->data;
const struct dacx3608_config *cfg = dev->config;
uint8_t buf[3] = {reg, val >> 8, val & 0xFF};
return i2c_write(data->i2c, buf, sizeof(buf), cfg->i2c_addr);
}
int dacx3608_reg_update(const struct device *dev, uint8_t reg,
uint16_t mask, bool setting)
{
uint16_t regval;
int ret;
ret = dacx3608_reg_read(dev, reg, &regval);
if (ret) {
return -EIO;
}
if (setting) {
regval |= mask;
} else {
regval &= ~mask;
}
ret = dacx3608_reg_write(dev, reg, regval);
if (ret) {
return ret;
}
return 0;
}
static int dacx3608_channel_setup(const struct device *dev,
const struct dac_channel_cfg *channel_cfg)
{
const struct dacx3608_config *config = dev->config;
struct dacx3608_data *data = dev->data;
bool setting = false;
int ret;
if (channel_cfg->channel_id > DACX3608_MAX_CHANNEL - 1) {
LOG_ERR("Unsupported channel %d", channel_cfg->channel_id);
return -ENOTSUP;
}
if (channel_cfg->resolution != config->resolution) {
LOG_ERR("Unsupported resolution %d", channel_cfg->resolution);
return -ENOTSUP;
}
if (data->configured & BIT(channel_cfg->channel_id)) {
LOG_DBG("Channel %d already configured", channel_cfg->channel_id);
return 0;
}
/* Clear PDNn bit */
ret = dacx3608_reg_update(dev, DACX3608_REG_DEVICE_CONFIG,
BIT(channel_cfg->channel_id), setting);
if (ret) {
LOG_ERR("Unable to update DEVICE_CONFIG register");
return -EIO;
}
data->configured |= BIT(channel_cfg->channel_id);
LOG_DBG("Channel %d initialized", channel_cfg->channel_id);
return 0;
}
static int dacx3608_write_value(const struct device *dev, uint8_t channel,
uint32_t value)
{
const struct dacx3608_config *config = dev->config;
struct dacx3608_data *data = dev->data;
uint16_t regval;
int ret;
if (channel > DACX3608_MAX_CHANNEL - 1) {
LOG_ERR("Unsupported channel %d", channel);
return -ENOTSUP;
}
if (!(data->configured & BIT(channel))) {
LOG_ERR("Channel %d not initialized", channel);
return -EINVAL;
}
if (value >= (1 << (config->resolution))) {
LOG_ERR("Value %d out of range", value);
return -EINVAL;
}
/*
* Shift passed value two times left because first two bits are Don't Care
*
* DACn_DATA register format:
*
* | 15 14 13 12 | 11 10 9 8 7 6 5 4 3 2 | 1 0 |
* |-------------|---------------------------------|------------|
* | Don't Care | DAC53608[9:0] / DAC43608[7:0] | Don't Care |
*/
regval = value << 2;
regval &= 0xFFFF;
ret = dacx3608_reg_write(dev, DACX3608_REG_DACA_DATA + channel, regval);
if (ret) {
LOG_ERR("Unable to set value %d on channel %d", value, channel);
return -EIO;
}
return 0;
}
static int dacx3608_soft_reset(const struct device *dev)
{
uint16_t regval = DACX3608_SW_RST;
int ret;
ret = dacx3608_reg_write(dev, DACX3608_REG_STATUS_TRIGGER, regval);
if (ret) {
return -EIO;
}
k_msleep(DACX3608_POR_DELAY);
return 0;
}
static int dacx3608_device_id_check(const struct device *dev)
{
uint16_t dev_id;
int ret;
ret = dacx3608_reg_read(dev, DACX3608_REG_STATUS_TRIGGER, &dev_id);
if (ret) {
LOG_ERR("Unable to read device ID");
return -EIO;
}
switch (dev_id) {
case DAC43608_DEVICE_ID:
case DAC53608_DEVICE_ID:
LOG_DBG("Device ID %#4x", dev_id);
break;
default:
LOG_ERR("Unknown Device ID %#4x", dev_id);
return -EIO;
}
return 0;
}
static int dacx3608_init(const struct device *dev)
{
const struct dacx3608_config *config = dev->config;
struct dacx3608_data *data = dev->data;
int ret;
data->i2c = device_get_binding(config->i2c_bus);
if (!data->i2c) {
LOG_ERR("Could not find I2C device");
return -EINVAL;
}
ret = dacx3608_soft_reset(dev);
if (ret) {
LOG_ERR("Soft-reset failed");
return ret;
}
ret = dacx3608_device_id_check(dev);
if (ret) {
return ret;
}
data->configured = 0;
LOG_DBG("Init complete");
return 0;
}
static const struct dac_driver_api dacx3608_driver_api = {
.channel_setup = dacx3608_channel_setup,
.write_value = dacx3608_write_value,
};
#define INST_DT_DACX3608(inst, t) DT_INST(inst, ti_dac##t)
#define DACX3608_DEVICE(t, n, res) \
static struct dacx3608_data dac##t##_data_##n; \
static const struct dacx3608_config dac##t##_config_##n = { \
.i2c_bus = DT_BUS_LABEL(INST_DT_DACX3608(n, t)), \
.i2c_addr = DT_REG_ADDR(INST_DT_DACX3608(n, t)), \
.resolution = res, \
}; \
DEVICE_DT_DEFINE(INST_DT_DACX3608(n, t), \
&dacx3608_init, NULL, \
&dac##t##_data_##n, \
&dac##t##_config_##n, POST_KERNEL, \
CONFIG_DAC_DACX3608_INIT_PRIORITY, \
&dacx3608_driver_api)
/*
* DAC43608: 8-bit
*/
#define DAC43608_DEVICE(n) DACX3608_DEVICE(43608, n, 8)
/*
* DAC53608: 10-bit
*/
#define DAC53608_DEVICE(n) DACX3608_DEVICE(53608, n, 10)
#define CALL_WITH_ARG(arg, expr) expr(arg)
#define INST_DT_DACX3608_FOREACH(t, inst_expr) \
UTIL_LISTIFY(DT_NUM_INST_STATUS_OKAY(ti_dac##t), \
CALL_WITH_ARG, inst_expr)
INST_DT_DACX3608_FOREACH(43608, DAC43608_DEVICE);
INST_DT_DACX3608_FOREACH(53608, DAC53608_DEVICE);