Philippe Mathieu-Daudé | c1b2982 | 2020-03-21 17:49:01 +0100 | [diff] [blame] | 1 | /* |
| 2 | * QEMU single LED device |
| 3 | * |
| 4 | * Copyright (C) 2020 Philippe Mathieu-Daudé <f4bug@amsat.org> |
| 5 | * |
| 6 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 7 | */ |
| 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 "trace.h" |
| 14 | |
| 15 | #define LED_INTENSITY_PERCENT_MAX 100 |
| 16 | |
| 17 | static const char * const led_color_name[] = { |
| 18 | [LED_COLOR_VIOLET] = "violet", |
| 19 | [LED_COLOR_BLUE] = "blue", |
| 20 | [LED_COLOR_CYAN] = "cyan", |
| 21 | [LED_COLOR_GREEN] = "green", |
Philippe Mathieu-Daudé | 956eb20 | 2021-03-13 16:18:34 +0100 | [diff] [blame] | 22 | [LED_COLOR_YELLOW] = "yellow", |
Philippe Mathieu-Daudé | c1b2982 | 2020-03-21 17:49:01 +0100 | [diff] [blame] | 23 | [LED_COLOR_AMBER] = "amber", |
| 24 | [LED_COLOR_ORANGE] = "orange", |
| 25 | [LED_COLOR_RED] = "red", |
| 26 | }; |
| 27 | |
| 28 | static bool led_color_name_is_valid(const char *color_name) |
| 29 | { |
| 30 | for (size_t i = 0; i < ARRAY_SIZE(led_color_name); i++) { |
| 31 | if (strcmp(color_name, led_color_name[i]) == 0) { |
| 32 | return true; |
| 33 | } |
| 34 | } |
| 35 | return false; |
| 36 | } |
| 37 | |
| 38 | void led_set_intensity(LEDState *s, unsigned intensity_percent) |
| 39 | { |
| 40 | if (intensity_percent > LED_INTENSITY_PERCENT_MAX) { |
| 41 | intensity_percent = LED_INTENSITY_PERCENT_MAX; |
| 42 | } |
| 43 | trace_led_set_intensity(s->description, s->color, intensity_percent); |
Philippe Mathieu-Daudé | 4aef439 | 2020-06-20 18:47:17 +0200 | [diff] [blame] | 44 | if (intensity_percent != s->intensity_percent) { |
| 45 | trace_led_change_intensity(s->description, s->color, |
| 46 | s->intensity_percent, intensity_percent); |
| 47 | } |
Philippe Mathieu-Daudé | c1b2982 | 2020-03-21 17:49:01 +0100 | [diff] [blame] | 48 | s->intensity_percent = intensity_percent; |
| 49 | } |
| 50 | |
| 51 | unsigned led_get_intensity(LEDState *s) |
| 52 | { |
| 53 | return s->intensity_percent; |
| 54 | } |
| 55 | |
| 56 | void led_set_state(LEDState *s, bool is_emitting) |
| 57 | { |
| 58 | led_set_intensity(s, is_emitting ? LED_INTENSITY_PERCENT_MAX : 0); |
| 59 | } |
| 60 | |
Philippe Mathieu-Daudé | ddb67f6 | 2020-06-16 06:23:50 +0200 | [diff] [blame] | 61 | static void led_set_state_gpio_handler(void *opaque, int line, int new_state) |
| 62 | { |
| 63 | LEDState *s = LED(opaque); |
| 64 | |
| 65 | assert(line == 0); |
| 66 | led_set_state(s, !!new_state != s->gpio_active_high); |
| 67 | } |
| 68 | |
Philippe Mathieu-Daudé | c1b2982 | 2020-03-21 17:49:01 +0100 | [diff] [blame] | 69 | static void led_reset(DeviceState *dev) |
| 70 | { |
| 71 | LEDState *s = LED(dev); |
| 72 | |
Philippe Mathieu-Daudé | ddb67f6 | 2020-06-16 06:23:50 +0200 | [diff] [blame] | 73 | led_set_state(s, s->gpio_active_high); |
Philippe Mathieu-Daudé | c1b2982 | 2020-03-21 17:49:01 +0100 | [diff] [blame] | 74 | } |
| 75 | |
| 76 | static const VMStateDescription vmstate_led = { |
| 77 | .name = TYPE_LED, |
| 78 | .version_id = 1, |
| 79 | .minimum_version_id = 1, |
| 80 | .fields = (VMStateField[]) { |
| 81 | VMSTATE_UINT8(intensity_percent, LEDState), |
| 82 | VMSTATE_END_OF_LIST() |
| 83 | } |
| 84 | }; |
| 85 | |
| 86 | static void led_realize(DeviceState *dev, Error **errp) |
| 87 | { |
| 88 | LEDState *s = LED(dev); |
| 89 | |
| 90 | if (s->color == NULL) { |
| 91 | error_setg(errp, "property 'color' not specified"); |
| 92 | return; |
| 93 | } else if (!led_color_name_is_valid(s->color)) { |
| 94 | error_setg(errp, "property 'color' invalid or not supported"); |
| 95 | return; |
| 96 | } |
| 97 | if (s->description == NULL) { |
| 98 | s->description = g_strdup("n/a"); |
| 99 | } |
Philippe Mathieu-Daudé | ddb67f6 | 2020-06-16 06:23:50 +0200 | [diff] [blame] | 100 | |
| 101 | qdev_init_gpio_in(DEVICE(s), led_set_state_gpio_handler, 1); |
Philippe Mathieu-Daudé | c1b2982 | 2020-03-21 17:49:01 +0100 | [diff] [blame] | 102 | } |
| 103 | |
| 104 | static Property led_properties[] = { |
| 105 | DEFINE_PROP_STRING("color", LEDState, color), |
| 106 | DEFINE_PROP_STRING("description", LEDState, description), |
Philippe Mathieu-Daudé | ddb67f6 | 2020-06-16 06:23:50 +0200 | [diff] [blame] | 107 | DEFINE_PROP_BOOL("gpio-active-high", LEDState, gpio_active_high, true), |
Philippe Mathieu-Daudé | c1b2982 | 2020-03-21 17:49:01 +0100 | [diff] [blame] | 108 | DEFINE_PROP_END_OF_LIST(), |
| 109 | }; |
| 110 | |
| 111 | static void led_class_init(ObjectClass *klass, void *data) |
| 112 | { |
| 113 | DeviceClass *dc = DEVICE_CLASS(klass); |
| 114 | |
| 115 | dc->desc = "LED"; |
| 116 | dc->vmsd = &vmstate_led; |
| 117 | dc->reset = led_reset; |
| 118 | dc->realize = led_realize; |
| 119 | set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories); |
| 120 | device_class_set_props(dc, led_properties); |
| 121 | } |
| 122 | |
| 123 | static const TypeInfo led_info = { |
| 124 | .name = TYPE_LED, |
| 125 | .parent = TYPE_DEVICE, |
| 126 | .instance_size = sizeof(LEDState), |
| 127 | .class_init = led_class_init |
| 128 | }; |
| 129 | |
| 130 | static void led_register_types(void) |
| 131 | { |
| 132 | type_register_static(&led_info); |
| 133 | } |
| 134 | |
| 135 | type_init(led_register_types) |
| 136 | |
| 137 | LEDState *led_create_simple(Object *parentobj, |
Philippe Mathieu-Daudé | ddb67f6 | 2020-06-16 06:23:50 +0200 | [diff] [blame] | 138 | GpioPolarity gpio_polarity, |
Philippe Mathieu-Daudé | c1b2982 | 2020-03-21 17:49:01 +0100 | [diff] [blame] | 139 | LEDColor color, |
| 140 | const char *description) |
| 141 | { |
| 142 | g_autofree char *name = NULL; |
| 143 | DeviceState *dev; |
| 144 | |
| 145 | dev = qdev_new(TYPE_LED); |
Philippe Mathieu-Daudé | ddb67f6 | 2020-06-16 06:23:50 +0200 | [diff] [blame] | 146 | qdev_prop_set_bit(dev, "gpio-active-high", |
| 147 | gpio_polarity == GPIO_POLARITY_ACTIVE_HIGH); |
Philippe Mathieu-Daudé | c1b2982 | 2020-03-21 17:49:01 +0100 | [diff] [blame] | 148 | qdev_prop_set_string(dev, "color", led_color_name[color]); |
| 149 | if (!description) { |
| 150 | static unsigned undescribed_led_id; |
| 151 | name = g_strdup_printf("undescribed-led-#%u", undescribed_led_id++); |
| 152 | } else { |
| 153 | qdev_prop_set_string(dev, "description", description); |
| 154 | name = g_ascii_strdown(description, -1); |
| 155 | name = g_strdelimit(name, " #", '-'); |
| 156 | } |
| 157 | object_property_add_child(parentobj, name, OBJECT(dev)); |
| 158 | qdev_realize_and_unref(dev, NULL, &error_fatal); |
| 159 | |
| 160 | return LED(dev); |
| 161 | } |