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/*
* Copyright (c) 2022 Nordic Semiconductor ASA
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT nordic_npm6001_wdt
#include <errno.h>
#include <zephyr/device.h>
#include <zephyr/drivers/i2c.h>
#include <zephyr/drivers/watchdog.h>
#include <zephyr/sys/util_macro.h>
#include <zephyr/toolchain.h>
/* nPM6001 Watchdog related registers */
#define NPM6001_WDARMEDVALUE 0x54U
#define NPM6001_WDARMEDSTROBE 0x55U
#define NPM6001_WDTRIGGERVALUE0 0x56U
#define NPM6001_WDTRIGGERVALUE1 0x57U
#define NPM6001_WDTRIGGERVALUE2 0x58U
#define NPM6001_WDDATASTROBE 0x5DU
#define NPM6001_WDPWRUPVALUE 0x5EU
#define NPM6001_WDPWRUPSTROBE 0x5FU
#define NPM6001_WDKICK 0x60U
#define NPM6001_WDREQPOWERDOWN 0x62U
/* nPM6001 WDTRIGGERVALUEx ms/LSB, min/max values */
#define NPM6001_WDTRIGGERVALUE_MS_LSB 4000U
#define NPM6001_WDTRIGGERVALUE_MIN 0x2U
#define NPM6001_WDTRIGGERVALUE_MAX 0xFFFFFFU
/* nPM6001 WDPWRUPVALUE fields */
#define NPM6001_WDPWRUPVALUE_OSC_ENABLE BIT(0)
#define NPM6001_WDPWRUPVALUE_COUNTER_ENABLE BIT(1)
#define NPM6001_WDPWRUPVALUE_LS_ENABLE BIT(2)
struct wdt_npm6001_config {
struct i2c_dt_spec bus;
};
static int wdt_npm6001_setup(const struct device *dev, uint8_t options)
{
ARG_UNUSED(dev);
ARG_UNUSED(options);
return 0;
}
static int wdt_npm6001_disable(const struct device *dev)
{
const struct wdt_npm6001_config *config = dev->config;
uint8_t buf[4] = {NPM6001_WDARMEDVALUE, 1U, NPM6001_WDARMEDSTROBE, 1U};
return i2c_write_dt(&config->bus, buf, sizeof(buf));
}
static int wdt_npm6001_install_timeout(const struct device *dev,
const struct wdt_timeout_cfg *timeout)
{
const struct wdt_npm6001_config *config = dev->config;
uint32_t window;
uint8_t buf[2];
int ret;
if (timeout->window.min != 0U) {
return -EINVAL;
}
/* round-up timeout, e.g. 5s -> 8s */
window = (((timeout->window.max + NPM6001_WDTRIGGERVALUE_MS_LSB - 1U) /
NPM6001_WDTRIGGERVALUE_MS_LSB) +
1U);
if ((window < NPM6001_WDTRIGGERVALUE_MIN) ||
(window > NPM6001_WDTRIGGERVALUE_MAX)) {
return -EINVAL;
}
/* enable OSC/COUNTER/LS */
buf[0] = NPM6001_WDPWRUPVALUE;
buf[1] = NPM6001_WDPWRUPVALUE_OSC_ENABLE |
NPM6001_WDPWRUPVALUE_COUNTER_ENABLE |
NPM6001_WDPWRUPVALUE_LS_ENABLE;
ret = i2c_write_dt(&config->bus, buf, sizeof(buf));
if (ret < 0) {
return ret;
}
buf[0] = NPM6001_WDPWRUPSTROBE;
buf[1] = 1U;
ret = i2c_write_dt(&config->bus, buf, sizeof(buf));
if (ret < 0) {
return ret;
}
/* write trigger value */
buf[0] = NPM6001_WDTRIGGERVALUE0;
buf[1] = (uint8_t)window;
ret = i2c_write_dt(&config->bus, buf, sizeof(buf));
if (ret < 0) {
return ret;
}
buf[0] = NPM6001_WDTRIGGERVALUE1;
buf[1] = (uint8_t)(window >> 8U);
ret = i2c_write_dt(&config->bus, buf, sizeof(buf));
if (ret < 0) {
return ret;
}
buf[0] = NPM6001_WDTRIGGERVALUE2;
buf[1] = (uint8_t)(window >> 16U);
ret = i2c_write_dt(&config->bus, buf, sizeof(buf));
if (ret < 0) {
return ret;
}
buf[0] = NPM6001_WDDATASTROBE;
buf[1] = 1U;
ret = i2c_write_dt(&config->bus, buf, sizeof(buf));
if (ret < 0) {
return ret;
}
/* arm watchdog & kick */
buf[0] = NPM6001_WDARMEDVALUE;
buf[1] = 1U;
ret = i2c_write_dt(&config->bus, buf, sizeof(buf));
if (ret < 0) {
return ret;
}
buf[0] = NPM6001_WDARMEDSTROBE;
buf[1] = 1U;
ret = i2c_write_dt(&config->bus, buf, sizeof(buf));
if (ret < 0) {
return ret;
}
buf[0] = NPM6001_WDKICK;
buf[1] = 1U;
ret = i2c_write_dt(&config->bus, buf, sizeof(buf));
if (ret < 0) {
return ret;
}
return 0;
}
static int wdt_npm6001_feed(const struct device *dev, int channel_id)
{
const struct wdt_npm6001_config *config = dev->config;
uint8_t buf[2] = {NPM6001_WDKICK, 1U};
ARG_UNUSED(channel_id);
return i2c_write_dt(&config->bus, buf, sizeof(buf));
}
static const struct wdt_driver_api wdt_npm6001_api = {
.setup = wdt_npm6001_setup,
.disable = wdt_npm6001_disable,
.install_timeout = wdt_npm6001_install_timeout,
.feed = wdt_npm6001_feed,
};
static int wdt_npm6001_init(const struct device *dev)
{
const struct wdt_npm6001_config *config = dev->config;
if (!device_is_ready(config->bus.bus)) {
return -ENODEV;
}
return 0;
}
#define WDT_NPM6001_DEFINE(n) \
static const struct wdt_npm6001_config wdt_npm6001_config##n = { \
.bus = I2C_DT_SPEC_GET(DT_INST_PARENT(n)), \
}; \
\
DEVICE_DT_INST_DEFINE(n, &wdt_npm6001_init, NULL, NULL, \
&wdt_npm6001_config##n, POST_KERNEL, \
CONFIG_WDT_NPM6001_INIT_PRIORITY, \
&wdt_npm6001_api);
DT_INST_FOREACH_STATUS_OKAY(WDT_NPM6001_DEFINE)