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8#include "qemu/osdep.h"
9#include "qapi/error.h"
10#include "migration/vmstate.h"
11#include "hw/qdev-properties.h"
12#include "hw/misc/led.h"
13#include "hw/irq.h"
14#include "trace.h"
15
16#define LED_INTENSITY_PERCENT_MAX 100
17
18static const char * const led_color_name[] = {
19 [LED_COLOR_VIOLET] = "violet",
20 [LED_COLOR_BLUE] = "blue",
21 [LED_COLOR_CYAN] = "cyan",
22 [LED_COLOR_GREEN] = "green",
23 [LED_COLOR_YELLOW] = "yellow",
24 [LED_COLOR_AMBER] = "amber",
25 [LED_COLOR_ORANGE] = "orange",
26 [LED_COLOR_RED] = "red",
27};
28
29static bool led_color_name_is_valid(const char *color_name)
30{
31 for (size_t i = 0; i < ARRAY_SIZE(led_color_name); i++) {
32 if (strcmp(color_name, led_color_name[i]) == 0) {
33 return true;
34 }
35 }
36 return false;
37}
38
39void led_set_intensity(LEDState *s, unsigned intensity_percent)
40{
41 if (intensity_percent > LED_INTENSITY_PERCENT_MAX) {
42 intensity_percent = LED_INTENSITY_PERCENT_MAX;
43 }
44 trace_led_set_intensity(s->description, s->color, intensity_percent);
45 if (intensity_percent != s->intensity_percent) {
46 trace_led_change_intensity(s->description, s->color,
47 s->intensity_percent, intensity_percent);
48 }
49 s->intensity_percent = intensity_percent;
50}
51
52unsigned led_get_intensity(LEDState *s)
53{
54 return s->intensity_percent;
55}
56
57void led_set_state(LEDState *s, bool is_emitting)
58{
59 led_set_intensity(s, is_emitting ? LED_INTENSITY_PERCENT_MAX : 0);
60}
61
62static void led_set_state_gpio_handler(void *opaque, int line, int new_state)
63{
64 LEDState *s = LED(opaque);
65
66 assert(line == 0);
67 led_set_state(s, !!new_state != s->gpio_active_high);
68}
69
70static void led_reset(DeviceState *dev)
71{
72 LEDState *s = LED(dev);
73
74 led_set_state(s, s->gpio_active_high);
75}
76
77static const VMStateDescription vmstate_led = {
78 .name = TYPE_LED,
79 .version_id = 1,
80 .minimum_version_id = 1,
81 .fields = (VMStateField[]) {
82 VMSTATE_UINT8(intensity_percent, LEDState),
83 VMSTATE_END_OF_LIST()
84 }
85};
86
87static void led_realize(DeviceState *dev, Error **errp)
88{
89 LEDState *s = LED(dev);
90
91 if (s->color == NULL) {
92 error_setg(errp, "property 'color' not specified");
93 return;
94 } else if (!led_color_name_is_valid(s->color)) {
95 error_setg(errp, "property 'color' invalid or not supported");
96 return;
97 }
98 if (s->description == NULL) {
99 s->description = g_strdup("n/a");
100 }
101
102 qdev_init_gpio_in(DEVICE(s), led_set_state_gpio_handler, 1);
103}
104
105static Property led_properties[] = {
106 DEFINE_PROP_STRING("color", LEDState, color),
107 DEFINE_PROP_STRING("description", LEDState, description),
108 DEFINE_PROP_BOOL("gpio-active-high", LEDState, gpio_active_high, true),
109 DEFINE_PROP_END_OF_LIST(),
110};
111
112static void led_class_init(ObjectClass *klass, void *data)
113{
114 DeviceClass *dc = DEVICE_CLASS(klass);
115
116 dc->desc = "LED";
117 dc->vmsd = &vmstate_led;
118 dc->reset = led_reset;
119 dc->realize = led_realize;
120 set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories);
121 device_class_set_props(dc, led_properties);
122}
123
124static const TypeInfo led_info = {
125 .name = TYPE_LED,
126 .parent = TYPE_DEVICE,
127 .instance_size = sizeof(LEDState),
128 .class_init = led_class_init
129};
130
131static void led_register_types(void)
132{
133 type_register_static(&led_info);
134}
135
136type_init(led_register_types)
137
138LEDState *led_create_simple(Object *parentobj,
139 GpioPolarity gpio_polarity,
140 LEDColor color,
141 const char *description)
142{
143 g_autofree char *name = NULL;
144 DeviceState *dev;
145
146 dev = qdev_new(TYPE_LED);
147 qdev_prop_set_bit(dev, "gpio-active-high",
148 gpio_polarity == GPIO_POLARITY_ACTIVE_HIGH);
149 qdev_prop_set_string(dev, "color", led_color_name[color]);
150 if (!description) {
151 static unsigned undescribed_led_id;
152 name = g_strdup_printf("undescribed-led-#%u", undescribed_led_id++);
153 } else {
154 qdev_prop_set_string(dev, "description", description);
155 name = g_ascii_strdown(description, -1);
156 name = g_strdelimit(name, " #", '-');
157 }
158 object_property_add_child(parentobj, name, OBJECT(dev));
159 qdev_realize_and_unref(dev, NULL, &error_fatal);
160
161 return LED(dev);
162}
163
