153 lines
3.4 KiB
C
153 lines
3.4 KiB
C
/*
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* Copyright (c) 2020 Seagate Technology LLC
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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 pwm_leds
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/**
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* @file
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* @brief PWM driven LEDs
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*/
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#include <drivers/led.h>
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#include <drivers/pwm.h>
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#include <device.h>
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#include <zephyr.h>
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#include <sys/math_extras.h>
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#include <logging/log.h>
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LOG_MODULE_REGISTER(led_pwm, CONFIG_LED_LOG_LEVEL);
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#define DEV_CFG(dev) ((const struct led_pwm_config *) ((dev)->config))
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struct led_pwm {
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const struct device *dev;
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uint32_t channel;
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uint32_t period;
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pwm_flags_t flags;
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};
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struct led_pwm_config {
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int num_leds;
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const struct led_pwm *led;
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};
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static int led_pwm_blink(const struct device *dev, uint32_t led,
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uint32_t delay_on, uint32_t delay_off)
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{
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const struct led_pwm_config *config = DEV_CFG(dev);
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const struct led_pwm *led_pwm;
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uint32_t period_usec, pulse_usec;
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if (led >= config->num_leds) {
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return -EINVAL;
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}
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/*
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* Convert delays (in ms) into PWM period and pulse (in us) and check
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* for overflows.
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*/
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if (u32_add_overflow(delay_on, delay_off, &period_usec) ||
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u32_mul_overflow(period_usec, 1000, &period_usec) ||
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u32_mul_overflow(delay_on, 1000, &pulse_usec)) {
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return -EINVAL;
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}
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led_pwm = &config->led[led];
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return pwm_pin_set_usec(led_pwm->dev, led_pwm->channel,
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period_usec, pulse_usec, led_pwm->flags);
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}
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static int led_pwm_set_brightness(const struct device *dev,
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uint32_t led, uint8_t value)
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{
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const struct led_pwm_config *config = DEV_CFG(dev);
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const struct led_pwm *led_pwm;
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uint32_t pulse;
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if (led >= config->num_leds || value > 100) {
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return -EINVAL;
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}
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led_pwm = &config->led[led];
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pulse = led_pwm->period * value / 100;
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return pwm_pin_set_cycles(led_pwm->dev, led_pwm->channel,
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led_pwm->period, pulse, led_pwm->flags);
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}
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static int led_pwm_on(const struct device *dev, uint32_t led)
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{
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return led_pwm_set_brightness(dev, led, 100);
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}
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static int led_pwm_off(const struct device *dev, uint32_t led)
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{
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return led_pwm_set_brightness(dev, led, 0);
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}
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static int led_pwm_init(const struct device *dev)
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{
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const struct led_pwm_config *config = DEV_CFG(dev);
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int i;
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if (!config->num_leds) {
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LOG_ERR("%s: no LEDs found (DT child nodes missing)",
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dev->name);
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return -ENODEV;
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}
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for (i = 0; i < config->num_leds; i++) {
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const struct led_pwm *led = &config->led[i];
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if (!device_is_ready(led->dev)) {
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LOG_ERR("%s: pwm device not ready", dev->name);
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return -ENODEV;
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}
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}
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return 0;
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}
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static const struct led_driver_api led_pwm_api = {
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.on = led_pwm_on,
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.off = led_pwm_off,
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.blink = led_pwm_blink,
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.set_brightness = led_pwm_set_brightness,
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};
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#define LED_PWM(led_node_id) \
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{ \
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.dev = DEVICE_DT_GET(DT_PWMS_CTLR(led_node_id)), \
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.channel = DT_PWMS_CHANNEL(led_node_id), \
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.period = DT_PHA_OR(led_node_id, pwms, period, 100), \
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.flags = DT_PHA_OR(led_node_id, pwms, flags, \
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PWM_POLARITY_NORMAL), \
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},
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#define LED_PWM_DEVICE(id) \
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\
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const struct led_pwm led_pwm_##id[] = { \
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DT_INST_FOREACH_CHILD(id, LED_PWM) \
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}; \
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\
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const struct led_pwm_config led_pwm_config_##id = { \
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.num_leds = ARRAY_SIZE(led_pwm_##id), \
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.led = led_pwm_##id, \
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}; \
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\
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DEVICE_DEFINE(led_pwm_##id, \
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DT_INST_PROP_OR(id, label, "LED_PWM_"#id), \
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&led_pwm_init, \
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device_pm_control_nop, \
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NULL, \
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&led_pwm_config_##id, \
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POST_KERNEL, CONFIG_LED_INIT_PRIORITY, \
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&led_pwm_api);
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DT_INST_FOREACH_STATUS_OKAY(LED_PWM_DEVICE)
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