[PATCH 1/2] tests: add backlight test

[Kristian Hoegsberg]

On Mon, Mar 12, 2012 at 07:40:08PM -0300, Tiago Vignatti wrote:
> Signed-off-by: Tiago Vignatti <tiago.vignatti at intel.com>

Thanks, applied.
Kristian

> ---
>  tests/Makefile.am    |    9 ++-
>  tests/setbacklight.c |  191 ++++++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 199 insertions(+), 1 deletions(-)
>  create mode 100644 tests/setbacklight.c
> 
> diff --git a/tests/Makefile.am b/tests/Makefile.am
> index ff64060..1df2c79 100644
> --- a/tests/Makefile.am
> +++ b/tests/Makefile.am
> @@ -1,6 +1,6 @@
>  if BUILD_TESTS
>  
> -noinst_PROGRAMS = matrix-test
> +noinst_PROGRAMS = matrix-test setbacklight
>  
>  endif
>  
> @@ -13,3 +13,10 @@ matrix_test_SOURCES =				\
>  	$(top_srcdir)/src/matrix.c		\
>  	$(top_srcdir)/src/matrix.h
>  matrix_test_LDADD = -lm -lrt
> +
> +setbacklight_SOURCES =				\
> +	setbacklight.c				\
> +	$(top_srcdir)/src/libbacklight.c	\
> +	$(top_srcdir)/src/libbacklight.h
> +
> +setbacklight_LDADD = -ludev -ldrm
> diff --git a/tests/setbacklight.c b/tests/setbacklight.c
> new file mode 100644
> index 0000000..f7b298c
> --- /dev/null
> +++ b/tests/setbacklight.c
> @@ -0,0 +1,191 @@
> +/*
> + * Copyright © 2012 Intel Corporation
> + *
> + * Permission to use, copy, modify, distribute, and sell this software and
> + * its documentation for any purpose is hereby granted without fee, provided
> + * that the above copyright notice appear in all copies and that both that
> + * copyright notice and this permission notice appear in supporting
> + * documentation, and that the name of the copyright holders not be used in
> + * advertising or publicity pertaining to distribution of the software
> + * without specific, written prior permission.  The copyright holders make
> + * no representations about the suitability of this software for any
> + * purpose.  It is provided "as is" without express or implied warranty.
> + *
> + * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
> + * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
> + * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
> + * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
> + * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
> + * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
> + * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
> + *
> + * Author: Tiago Vignatti
> + */
> +/*
> + * \file setbacklight.c
> + * Test program to get a backlight connector and set its brightness value.
> + * Queries for the connectors id can be performed using drm/tests/modeprint
> + * program.
> + */
> +
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <unistd.h>
> +#include <fcntl.h>
> +#include <xf86drm.h>
> +#include <xf86drmMode.h>
> +
> +#include "libbacklight.h"
> +
> +static uint32_t
> +get_drm_connector_type(struct udev_device *drm_device, uint32_t connector_id)
> +{
> +	const char *filename;
> +	int fd, i, connector_type;
> +	drmModeResPtr res;
> +	drmModeConnectorPtr connector;
> +
> +	filename = udev_device_get_devnode(drm_device);
> +	fd = open(filename, O_RDWR | O_CLOEXEC);
> +	if (fd < 0) {
> +		printf("couldn't open drm_device\n");
> +		return -1;
> +	}
> +
> +	res = drmModeGetResources(fd);
> +	if (res == 0) {
> +		printf("Failed to get resources from card\n");
> +		close(fd);
> +		return -1;
> +	}
> +
> +	for (i = 0; i < res->count_connectors; i++) {
> +		connector = drmModeGetConnector(fd, res->connectors[i]);
> +		if (!connector)
> +			continue;
> +
> +		if ((connector->connection == DRM_MODE_DISCONNECTED) ||
> +		    (connector->connector_id != connector_id)) {
> +			drmModeFreeConnector(connector);
> +			continue;
> +		}
> +
> +		connector_type = connector->connector_type;
> +		drmModeFreeConnector(connector);
> +		drmModeFreeResources(res);
> +
> +		return connector_type;
> +	}
> +
> +	drmModeFreeResources(res);
> +	return -1;
> +}
> +
> +/* returns a value between 0-255 range, where higher is brighter */
> +static uint32_t
> +get_normalized_backlight(struct backlight *backlight)
> +{
> +	long brightness, max_brightness;
> +	long norm;
> +
> +	brightness = backlight_get_brightness(backlight);
> +	max_brightness = backlight_get_max_brightness(backlight);
> +
> +	/* convert it to a scale of 0 to 255 */
> +	norm = (brightness * 255)/(max_brightness);
> +
> +	return (int) norm;
> +}
> +
> +static void
> +set_backlight(struct udev_device *drm_device, int connector_id, int blight)
> +{
> +	int connector_type;
> +	long max_brightness, brightness, actual_brightness;
> +	struct backlight *backlight;
> +	long new_blight;
> +
> +	connector_type = get_drm_connector_type(drm_device, connector_id);
> +	if (connector_type < 0)
> +		return;
> +
> +	backlight = backlight_init(drm_device, connector_type);
> +	if (!backlight) {
> +		printf("backlight adjust failed\n");
> +		return;
> +	}
> +
> +	max_brightness = backlight_get_max_brightness(backlight);
> +	printf("Max backlight: %ld\n", max_brightness);
> +
> +	brightness = backlight_get_brightness(backlight);
> +	printf("Cached backlight: %ld\n", brightness);
> +
> +	actual_brightness = backlight_get_actual_brightness(backlight);
> +	printf("Hardware backlight: %ld\n", actual_brightness);
> +
> +	printf("normalized current brightness: %d\n",
> +	       get_normalized_backlight(backlight));
> +
> +	/* denormalized value */
> +	new_blight = (blight * max_brightness) / 255;
> +
> +	backlight_set_brightness(backlight, new_blight);
> +	printf("Setting brightness to: %ld (norm: %d)\n", new_blight, blight);
> +
> +	backlight_destroy(backlight);
> +}
> +
> +int
> +main(int argc, char **argv)
> +{
> +	int blight, connector_id;
> +	const char *default_seat = "seat0";
> +	const char *path, *device_seat;
> +	struct udev *udev;
> +	struct udev_enumerate *e;
> +	struct udev_list_entry *entry;
> +	struct udev_device *device, *drm_device;
> +
> +	if (argc < 3) {
> +		printf("Please add connector_id and brightness values from 0-255\n");
> +		return 1;
> +	}
> +
> +	connector_id = atoi(argv[1]);
> +	blight = atoi(argv[2]);
> +
> +	udev = udev_new();
> +	if (udev == NULL) {
> +		printf("failed to initialize udev context\n");
> +		return 1;
> +	}
> +
> +	e = udev_enumerate_new(udev);
> +	udev_enumerate_add_match_subsystem(e, "drm");
> +	udev_enumerate_add_match_sysname(e, "card[0-9]*");
> +
> +	udev_enumerate_scan_devices(e);
> +	drm_device = NULL;
> +	udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
> +		path = udev_list_entry_get_name(entry);
> +		device = udev_device_new_from_syspath(udev, path);
> +		device_seat =
> +			udev_device_get_property_value(device, "ID_SEAT");
> +		if (!device_seat)
> +			device_seat = default_seat;
> +
> +		drm_device = device;
> +		break;
> +	}
> +
> +	if (drm_device == NULL) {
> +		printf("no drm device found\n");
> +		return 1;
> +	}
> +
> +	set_backlight(drm_device, connector_id, blight);
> +
> +	udev_device_unref(drm_device);
> +	return 0;
> +}
> -- 
> 1.7.5.4
> 
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