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hw/misc/led: Add a LED device 

Add a LED device which can be connected to a GPIO output.
They can also be dimmed with PWM devices. For now we do
not implement the dimmed mode, but in preparation of a
future implementation, we start using the LED intensity.

LEDs are limited to a fixed set of colors.

Reviewed-by: Luc Michel <luc.michel@greensocs.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20200912134041.946260-2-f4bug@amsat.org>
This commit is contained in:
Philippe Mathieu-Daudé 2020-03-21 17:49:01 +01:00
parent a5fac424c7
commit c1b2982627
6 changed files with 242 additions and 0 deletions
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6
MAINTAINERS
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@ -1967,6 +1967,12 @@ F: docs/specs/vmgenid.txt
F: tests/qtest/vmgenid-test.c
F: stubs/vmgenid.c
LED
M: Philippe Mathieu-Daudé <f4bug@amsat.org>
S: Maintained
F: include/hw/misc/led.h
F: hw/misc/led.c
Unimplemented device
M: Peter Maydell <peter.maydell@linaro.org>
R: Philippe Mathieu-Daudé <f4bug@amsat.org>

3
hw/misc/Kconfig
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@ -126,6 +126,9 @@ config AUX
config UNIMP
bool
config LED
bool
config MAC_VIA
bool
select MOS6522

142
hw/misc/led.c Normal file
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@ -0,0 +1,142 @@
/*
* 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 "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);
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_reset(DeviceState *dev)
{
LEDState *s = LED(dev);
led_set_state(s, false);
}
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");
}
}
static Property led_properties[] = {
DEFINE_PROP_STRING("color", LEDState, color),
DEFINE_PROP_STRING("description", LEDState, description),
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,
LEDColor color,
const char *description)
{
g_autofree char *name = NULL;
DeviceState *dev;
dev = qdev_new(TYPE_LED);
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);
}

1
hw/misc/meson.build
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@ -11,6 +11,7 @@ softmmu_ss.add(when: 'CONFIG_TMP105', if_true: files('tmp105.c'))
softmmu_ss.add(when: 'CONFIG_TMP421', if_true: files('tmp421.c'))
softmmu_ss.add(when: 'CONFIG_UNIMP', if_true: files('unimp.c'))
softmmu_ss.add(when: 'CONFIG_EMPTY_SLOT', if_true: files('empty_slot.c'))
softmmu_ss.add(when: 'CONFIG_LED', if_true: files('led.c'))
# ARM devices
softmmu_ss.add(when: 'CONFIG_PL310', if_true: files('arm_l2x0.c'))

3
hw/misc/trace-events
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@ -223,6 +223,9 @@ via1_adb_poll(uint8_t data, const char *vadbint, int status, int index, int size
grlib_ahb_pnp_read(uint64_t addr, uint32_t value) "AHB PnP read addr:0x%03"PRIx64" data:0x%08x"
grlib_apb_pnp_read(uint64_t addr, uint32_t value) "APB PnP read addr:0x%03"PRIx64" data:0x%08x"
# led.c
led_set_intensity(const char *color, const char *desc, uint8_t intensity_percent) "LED desc:'%s' color:%s intensity: %u%%"
# pca9552.c
pca955x_gpio_status(const char *description, const char *buf) "%s GPIOs 0-15 [%s]"
pca955x_gpio_change(const char *description, unsigned id, unsigned prev_state, unsigned current_state) "%s GPIO id:%u status: %u -> %u"

87
include/hw/misc/led.h Normal file
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@ -0,0 +1,87 @@
/*
* QEMU single LED device
*
* Copyright (C) 2020 Philippe Mathieu-Daudé <f4bug@amsat.org>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef HW_MISC_LED_H
#define HW_MISC_LED_H
#include "qom/object.h"
#define TYPE_LED "led"
/**
* LEDColor: Color of a LED
*
* This set is restricted to physically available LED colors.
*
* LED colors from 'Table 1. Product performance of LUXEON Rebel Color
* Line' of the 'DS68 LUXEON Rebel Color Line' datasheet available at:
* https://www.lumileds.com/products/color-leds/luxeon-rebel-color/
*/
typedef enum { /* Coarse wavelength range */
LED_COLOR_VIOLET, /* 425 nm */
LED_COLOR_BLUE, /* 475 nm */
LED_COLOR_CYAN, /* 500 nm */
LED_COLOR_GREEN, /* 535 nm */
LED_COLOR_AMBER, /* 590 nm */
LED_COLOR_ORANGE, /* 615 nm */
LED_COLOR_RED, /* 630 nm */
} LEDColor;
struct LEDState {
/* Private */
DeviceState parent_obj;
/* Public */
uint8_t intensity_percent;
/* Properties */
char *description;
char *color;
};
typedef struct LEDState LEDState;
DECLARE_INSTANCE_CHECKER(LEDState, LED, TYPE_LED)
/**
* led_set_intensity: Set the intensity of a LED device
* @s: the LED object
* @intensity_percent: intensity as percentage in range 0 to 100.
*/
void led_set_intensity(LEDState *s, unsigned intensity_percent);
/**
* led_get_intensity:
* @s: the LED object
*
* Returns: The LED intensity as percentage in range 0 to 100.
*/
unsigned led_get_intensity(LEDState *s);
/**
* led_set_state: Set the state of a LED device
* @s: the LED object
* @is_emitting: boolean indicating whether the LED is emitting
*
* This utility is meant for LED connected to GPIO.
*/
void led_set_state(LEDState *s, bool is_emitting);
/**
* led_create_simple: Create and realize a LED device
* @parentobj: the parent object
* @color: color of the LED
* @description: description of the LED (optional)
*
* Create the device state structure, initialize it, and
* drop the reference to it (the device is realized).
*
* Returns: The newly allocated and instantiated LED object.
*/
LEDState *led_create_simple(Object *parentobj,
LEDColor color,
const char *description);
#endif /* HW_MISC_LED_H */