Attachment 30784 Details for Bug 24765 – Add support for ACPI backlight control for FreeBSD and DrangonFlyBSD

[patch] Add support for ACPI backlight control for FreeBSD and DrangonFlyBSD

radeonhd-backlight.diff4 (text/plain), 3.07 KB, created by Jung-uk Kim on 2009-10-28 21:32:22 UTC

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Creator: Jung-uk Kim

Created: 2009-10-28 21:32:22 UTC

Size: 3.07 KB

patch

obsolete

>--- src/rhd_acpi.c.orig	2009-10-06 07:36:07.000000000 -0400
>+++ src/rhd_acpi.c	2009-10-28 21:55:56.000000000 -0400
>@@ -47,6 +47,88 @@
> #include "rhd_acpi.h"
> 
> 
>+#if defined(__FreeBSD__) || defined(__DragonFly__)
>+
>+#include <stdlib.h>
>+#include <sys/sysctl.h>
>+
>+#define	ACPI_VIDEO_LEVELS	"hw.acpi.video.lcd0.levels"
>+#define	ACPI_VIDEO_BRIGHTNESS	"hw.acpi.video.lcd0.brightness"
>+
>+#define	RHD_BL_ROUNDDOWN(x, y)	(((x) / (y)) * (y))
>+
>+/*
>+ * Get/Set LCD backlight brightness via acpi_video(4).
>+ */
>+static Bool
>+rhdDoBacklight(struct rhdOutput *Output, Bool do_write, int *val)
>+{
>+    int *levels;
>+    size_t len;
>+    int level;
>+    int max_levels, num_levels;
>+    int d1, d2, max, min;
>+    int lower, step;
>+    int i;
>+    RHDFUNC(Output);
>+
>+    if (sysctlbyname(ACPI_VIDEO_LEVELS, NULL, &len, NULL, 0) != 0 || len == 0)
>+	return FALSE;
>+    levels = (int *)malloc(len);
>+    if (levels == NULL)
>+	return FALSE;
>+    if (sysctlbyname(ACPI_VIDEO_LEVELS, levels, &len, NULL, 0) != 0) {
>+	free(levels);
>+	return FALSE;
>+    }
>+
>+    num_levels = len / sizeof(*levels);
>+    for (i = 1, max = 0, min = 0; i < num_levels; i++) {
>+	if (levels[i] < levels[min])
>+	    min = i;
>+	if (levels[i] > levels[max])
>+	    max = i;
>+    }
>+    max_levels = levels[max] - levels[min] + 1;
>+    step = (RHD_BACKLIGHT_PROPERTY_MAX + 1) / max_levels;
>+
>+    if (do_write) {
>+	if (*val >= RHD_BL_ROUNDDOWN(RHD_BACKLIGHT_PROPERTY_MAX, step)) {
>+	    level = levels[max];
>+	    free(levels);
>+	} else {
>+	    d1 = RHD_BACKLIGHT_PROPERTY_MAX;
>+	    lower = RHD_BL_ROUNDDOWN(*val, step);
>+	    for (i = 0; i < num_levels; i++) {
>+		if (levels[i] * (RHD_BACKLIGHT_PROPERTY_MAX + 1) / max_levels >= lower) {
>+		    d2 = levels[i] * step - lower;
>+		    if (d1 > d2) {
>+			level = levels[i];
>+			d1 = d2;
>+		    }
>+		}
>+	    }
>+	    free(levels);
>+	    if (d1 >= RHD_BACKLIGHT_PROPERTY_MAX)
>+		return FALSE;
>+	}
>+	if (sysctlbyname(ACPI_VIDEO_BRIGHTNESS, NULL, 0, &level, sizeof(level)) != 0)
>+	    return FALSE;
>+	RHDDebug(Output->scrnIndex, "%s: Wrote value %i (ACPI %i)\n", __func__, *val, level);
>+    } else {
>+	free(levels);
>+	len = sizeof(level);
>+	if (sysctlbyname(ACPI_VIDEO_BRIGHTNESS, &level, &len, NULL, 0) != 0)
>+	    return FALSE;
>+	*val = level * (RHD_BACKLIGHT_PROPERTY_MAX + 1) / max_levels + step - 1;
>+	RHDDebug(Output->scrnIndex, "%s: Read value %i (ACPI %i)\n", __func__, *val, level);
>+    }
>+
>+    return TRUE;
>+}
>+
>+#elif defined(__linux__)
>+
> #define ACPI_PATH "/sys/class/backlight"
> 
> /*
>@@ -120,6 +202,7 @@
> 
>     return FALSE;
> }
>+#endif
> 
> /*
>  * RhdACPIGetBacklightControl(): return backlight value in range 0..255;
>@@ -128,7 +211,7 @@
> int
> RhdACPIGetBacklightControl(struct rhdOutput *Output)
> {
>-#ifdef __linux__
>+#if defined(__FreeBSD__) || defined(__DragonFly__) || defined(__linux__)
>     int ret;
>     RHDFUNC(Output);
>     if (rhdDoBacklight(Output, FALSE, &ret))
>@@ -144,7 +227,7 @@
> RhdACPISetBacklightControl(struct rhdOutput *Output, int val)
> {
>     RHDFUNC(Output);
>-#ifdef __linux__
>+#if defined(__FreeBSD__) || defined(__DragonFly__) || defined(__linux__)
>     rhdDoBacklight(Output, TRUE, &val);
> #endif
> }

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Attachments on bug 24765: 30756 | 30757 | 30780 | 30783 | 30784 | 30785 | 30812

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