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