Merge remote-tracking branch 'remotes/philmd-gitlab/tags/led-api-20201026' into staging

API to model LED.

CI jobs results:
. https://cirrus-ci.com/build/4879251751043072
. https://gitlab.com/philmd/qemu/-/pipelines/207661784
. https://travis-ci.org/github/philmd/qemu/builds/738958191
. https://app.shippable.com/github/philmd/qemu/runs/891/summary/console

# gpg: Signature made Mon 26 Oct 2020 22:03:59 GMT
# gpg:                using RSA key FAABE75E12917221DCFD6BB2E3E32C2CDEADC0DE
# gpg: Good signature from "Philippe Mathieu-Daudé (F4BUG) <f4bug@amsat.org>" [full]
# Primary key fingerprint: FAAB E75E 1291 7221 DCFD  6BB2 E3E3 2C2C DEAD C0DE

* remotes/philmd-gitlab/tags/led-api-20201026:
  hw/arm/tosa: Replace fprintf() calls by LED devices
  hw/misc/mps2-scc: Use the LED device
  hw/misc/mps2-fpgaio: Use the LED device
  hw/arm/aspeed: Add the 3 front LEDs drived by the PCA9552 #1
  hw/misc/led: Emit a trace event when LED intensity has changed
  hw/misc/led: Allow connecting from GPIO output
  hw/misc/led: Add a LED device

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 97 insertions, 0 deletions

diff --git a/include/hw/misc/led.h b/include/hw/misc/led.h
new file mode 100644
index 0000000000..aa359b87c2
--- /dev/null
+++ b/include/hw/misc/led.h
@@ -0,0 +1,97 @@
+/*
+ * 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"
+#include "hw/qdev-core.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;
+    qemu_irq irq;
+
+    /* Properties */
+    char *description;
+    char *color;
+    /*
+     * Determines whether a GPIO is using a positive (active-high)
+     * logic (when used with GPIO, the intensity at reset is related
+     * to the GPIO polarity).
+     */
+    bool gpio_active_high;
+};
+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
+ * @gpio_polarity: GPIO polarity
+ * @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,
+                            GpioPolarity gpio_polarity,
+                            LEDColor color,
+                            const char *description);
+
+#endif /* HW_MISC_LED_H */