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/*
* QEMU single LED device
*
* Copyright (C) 2020 Philippe Mathieu-Daudé <f4bug@amsat.org>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "migration/vmstate.h"
#include "hw/qdev-properties.h"
#include "hw/misc/led.h"
#include "hw/irq.h"
#include "trace.h"
#define LED_INTENSITY_PERCENT_MAX 100
static const char * const led_color_name[] = {
[LED_COLOR_VIOLET] = "violet",
[LED_COLOR_BLUE] = "blue",
[LED_COLOR_CYAN] = "cyan",
[LED_COLOR_GREEN] = "green",
[LED_COLOR_AMBER] = "amber",
[LED_COLOR_ORANGE] = "orange",
[LED_COLOR_RED] = "red",
};
static bool led_color_name_is_valid(const char *color_name)
{
for (size_t i = 0; i < ARRAY_SIZE(led_color_name); i++) {
if (strcmp(color_name, led_color_name[i]) == 0) {
return true;
}
}
return false;
}
void led_set_intensity(LEDState *s, unsigned intensity_percent)
{
if (intensity_percent > LED_INTENSITY_PERCENT_MAX) {
intensity_percent = LED_INTENSITY_PERCENT_MAX;
}
trace_led_set_intensity(s->description, s->color, intensity_percent);
if (intensity_percent != s->intensity_percent) {
trace_led_change_intensity(s->description, s->color,
s->intensity_percent, intensity_percent);
}
s->intensity_percent = intensity_percent;
}
unsigned led_get_intensity(LEDState *s)
{
return s->intensity_percent;
}
void led_set_state(LEDState *s, bool is_emitting)
{
led_set_intensity(s, is_emitting ? LED_INTENSITY_PERCENT_MAX : 0);
}
static void led_set_state_gpio_handler(void *opaque, int line, int new_state)
{
LEDState *s = LED(opaque);
assert(line == 0);
led_set_state(s, !!new_state != s->gpio_active_high);
}
static void led_reset(DeviceState *dev)
{
LEDState *s = LED(dev);
led_set_state(s, s->gpio_active_high);
}
static const VMStateDescription vmstate_led = {
.name = TYPE_LED,
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT8(intensity_percent, LEDState),
VMSTATE_END_OF_LIST()
}
};
static void led_realize(DeviceState *dev, Error **errp)
{
LEDState *s = LED(dev);
if (s->color == NULL) {
error_setg(errp, "property 'color' not specified");
return;
} else if (!led_color_name_is_valid(s->color)) {
error_setg(errp, "property 'color' invalid or not supported");
return;
}
if (s->description == NULL) {
s->description = g_strdup("n/a");
}
qdev_init_gpio_in(DEVICE(s), led_set_state_gpio_handler, 1);
}
static Property led_properties[] = {
DEFINE_PROP_STRING("color", LEDState, color),
DEFINE_PROP_STRING("description", LEDState, description),
DEFINE_PROP_BOOL("gpio-active-high", LEDState, gpio_active_high, true),
DEFINE_PROP_END_OF_LIST(),
};
static void led_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->desc = "LED";
dc->vmsd = &vmstate_led;
dc->reset = led_reset;
dc->realize = led_realize;
set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories);
device_class_set_props(dc, led_properties);
}
static const TypeInfo led_info = {
.name = TYPE_LED,
.parent = TYPE_DEVICE,
.instance_size = sizeof(LEDState),
.class_init = led_class_init
};
static void led_register_types(void)
{
type_register_static(&led_info);
}
type_init(led_register_types)
LEDState *led_create_simple(Object *parentobj,
GpioPolarity gpio_polarity,
LEDColor color,
const char *description)
{
g_autofree char *name = NULL;
DeviceState *dev;
dev = qdev_new(TYPE_LED);
qdev_prop_set_bit(dev, "gpio-active-high",
gpio_polarity == GPIO_POLARITY_ACTIVE_HIGH);
qdev_prop_set_string(dev, "color", led_color_name[color]);
if (!description) {
static unsigned undescribed_led_id;
name = g_strdup_printf("undescribed-led-#%u", undescribed_led_id++);
} else {
qdev_prop_set_string(dev, "description", description);
name = g_ascii_strdown(description, -1);
name = g_strdelimit(name, " #", '-');
}
object_property_add_child(parentobj, name, OBJECT(dev));
qdev_realize_and_unref(dev, NULL, &error_fatal);
return LED(dev);
}
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