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/*
* Copyright © 2015 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Author:
* Antti Koskipaa <antti.koskipaa@linux.intel.com>
*
*/
#include "igt.h"
#include <limits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <time.h>
struct context {
int max;
};
#define TOLERANCE 5 /* percent */
#define BACKLIGHT_PATH "/sys/class/backlight/intel_backlight"
#define FADESTEPS 10
#define FADESPEED 100 /* milliseconds between steps */
IGT_TEST_DESCRIPTION("Basic backlight sysfs test");
static int backlight_read(int *result, const char *fname)
{
int fd;
char full[PATH_MAX];
char dst[64];
int r, e;
igt_assert(snprintf(full, PATH_MAX, "%s/%s", BACKLIGHT_PATH, fname) < PATH_MAX);
fd = open(full, O_RDONLY);
if (fd == -1)
return -errno;
r = read(fd, dst, sizeof(dst));
e = errno;
close(fd);
if (r < 0)
return -e;
errno = 0;
*result = strtol(dst, NULL, 10);
return errno;
}
static int backlight_write(int value, const char *fname)
{
int fd;
char full[PATH_MAX];
char src[64];
int len;
igt_assert(snprintf(full, PATH_MAX, "%s/%s", BACKLIGHT_PATH, fname) < PATH_MAX);
fd = open(full, O_WRONLY);
if (fd == -1)
return -errno;
len = snprintf(src, sizeof(src), "%i", value);
len = write(fd, src, len);
close(fd);
if (len < 0)
return len;
return 0;
}
static void test_and_verify(struct context *context, int val)
{
const int tolerance = val * TOLERANCE / 100;
int result;
igt_assert_eq(backlight_write(val, "brightness"), 0);
igt_assert_eq(backlight_read(&result, "brightness"), 0);
/* Check that the exact value sticks */
igt_assert_eq(result, val);
igt_assert_eq(backlight_read(&result, "actual_brightness"), 0);
/* Some rounding may happen depending on hw */
igt_assert_f(result >= max(0, val - tolerance) &&
result <= min(context->max, val + tolerance),
"actual_brightness [%d] did not match expected brightness [%d +- %d]\n",
result, val, tolerance);
}
static void test_brightness(struct context *context)
{
test_and_verify(context, 0);
test_and_verify(context, context->max);
test_and_verify(context, context->max / 2);
}
static void test_bad_brightness(struct context *context)
{
int val;
/* First write some sane value */
backlight_write(context->max / 2, "brightness");
/* Writing invalid values should fail and not change the value */
igt_assert_lt(backlight_write(-1, "brightness"), 0);
backlight_read(&val, "brightness");
igt_assert_eq(val, context->max / 2);
igt_assert_lt(backlight_write(context->max + 1, "brightness"), 0);
backlight_read(&val, "brightness");
igt_assert_eq(val, context->max / 2);
igt_assert_lt(backlight_write(INT_MAX, "brightness"), 0);
backlight_read(&val, "brightness");
igt_assert_eq(val, context->max / 2);
}
static void test_fade(struct context *context)
{
int i;
static const struct timespec ts = { .tv_sec = 0, .tv_nsec = FADESPEED*1000000 };
/* Fade out, then in */
for (i = context->max; i > 0; i -= context->max / FADESTEPS) {
test_and_verify(context, i);
nanosleep(&ts, NULL);
}
for (i = 0; i <= context->max; i += context->max / FADESTEPS) {
test_and_verify(context, i);
nanosleep(&ts, NULL);
}
}
static void
test_fade_with_dpms(struct context *context, igt_output_t *output)
{
igt_require(igt_setup_runtime_pm(output->display->drm_fd));
kmstest_set_connector_dpms(output->display->drm_fd,
output->config.connector,
DRM_MODE_DPMS_OFF);
igt_require(igt_wait_for_pm_status(IGT_RUNTIME_PM_STATUS_SUSPENDED));
kmstest_set_connector_dpms(output->display->drm_fd,
output->config.connector,
DRM_MODE_DPMS_ON);
igt_assert(igt_wait_for_pm_status(IGT_RUNTIME_PM_STATUS_ACTIVE));
test_fade(context);
}
static void
test_fade_with_suspend(struct context *context, igt_output_t *output)
{
igt_system_suspend_autoresume(SUSPEND_STATE_MEM, SUSPEND_TEST_NONE);
test_fade(context);
}
igt_main
{
struct context context = {0};
int old;
igt_display_t display;
igt_output_t *output;
struct igt_fb fb;
igt_fixture {
enum pipe pipe;
bool found = false;
char full_name[32] = {};
char *name;
drmModeModeInfo *mode;
igt_plane_t *primary;
/*
* Backlight tests requires the output to be enabled,
* try to enable all.
*/
kmstest_set_vt_graphics_mode();
igt_display_require(&display, drm_open_driver(DRIVER_INTEL));
/* Get the max value and skip the whole test if sysfs interface not available */
igt_skip_on(backlight_read(&old, "brightness"));
igt_assert(backlight_read(&context.max, "max_brightness") > -1);
/* should be ../../cardX-$output */
igt_assert_lt(12, readlink(BACKLIGHT_PATH "/device", full_name, sizeof(full_name) - 1));
name = basename(full_name);
for_each_pipe_with_valid_output(&display, pipe, output) {
if (strcmp(name + 6, output->name))
continue;
found = true;
break;
}
igt_require_f(found,
"Could not map backlight for \"%s\" to connected output\n",
name);
igt_output_set_pipe(output, pipe);
mode = igt_output_get_mode(output);
igt_create_pattern_fb(display.drm_fd,
mode->hdisplay, mode->vdisplay,
DRM_FORMAT_XRGB8888,
LOCAL_DRM_FORMAT_MOD_NONE, &fb);
primary = igt_output_get_plane_type(output, DRM_PLANE_TYPE_PRIMARY);
igt_plane_set_fb(primary, &fb);
igt_display_commit2(&display, display.is_atomic ? COMMIT_ATOMIC : COMMIT_LEGACY);
igt_pm_enable_sata_link_power_management();
}
igt_subtest("basic-brightness")
test_brightness(&context);
igt_subtest("bad-brightness")
test_bad_brightness(&context);
igt_subtest("fade")
test_fade(&context);
igt_subtest("fade_with_dpms")
test_fade_with_dpms(&context, output);
igt_subtest("fade_with_suspend")
test_fade_with_suspend(&context, output);
igt_fixture {
/* Restore old brightness */
backlight_write(old, "brightness");
igt_display_fini(&display);
igt_remove_fb(display.drm_fd, &fb);
igt_pm_restore_sata_link_power_management();
close(display.drm_fd);
}
}
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