On Thu, 28 May 2015, Antti Koskipaa <antti.koskipaa@xxxxxxxxxxxxxxx> wrote: > This is a basic sanity test of the backlight sysfs interface. > > v2: > - Add jani's suggestion for immediate readback > - Remove unused parameter from test_and_verify() > - Add fade test > > Issue: VIZ-3377 > Signed-off-by: Antti Koskipaa <antti.koskipaa@xxxxxxxxxxxxxxx> Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx> > --- > tests/.gitignore | 1 + > tests/Makefile.sources | 1 + > tests/pm_backlight.c | 171 +++++++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 173 insertions(+) > create mode 100644 tests/pm_backlight.c > > diff --git a/tests/.gitignore b/tests/.gitignore > index a3f3143..f816ded 100644 > --- a/tests/.gitignore > +++ b/tests/.gitignore > @@ -150,6 +150,7 @@ kms_vblank > kms_crtc_background_color > kms_plane_scaling > kms_panel_fitting > +pm_backlight > pm_lpsp > pm_rc6_residency > pm_rpm > diff --git a/tests/Makefile.sources b/tests/Makefile.sources > index 994c31b..d2a44e8 100644 > --- a/tests/Makefile.sources > +++ b/tests/Makefile.sources > @@ -80,6 +80,7 @@ TESTS_progs_M = \ > kms_crtc_background_color \ > kms_plane_scaling \ > kms_panel_fitting \ > + pm_backlight \ > pm_lpsp \ > pm_rpm \ > pm_rps \ > diff --git a/tests/pm_backlight.c b/tests/pm_backlight.c > new file mode 100644 > index 0000000..d02336d > --- /dev/null > +++ b/tests/pm_backlight.c > @@ -0,0 +1,171 @@ > +/* > + * 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@xxxxxxxxxxxxxxx> > + * > + */ > + > +#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> > + > +#include "igt_core.h" > + > +#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(int val) > +{ > + int result; > + > + igt_assert(backlight_write(val, "brightness") == 0); > + igt_assert(backlight_read(&result, "brightness") == 0); > + /* Check that the exact value sticks */ > + igt_assert(result == val); > + > + igt_assert(backlight_read(&result, "actual_brightness") == 0); > + /* Some rounding may happen depending on hw. Just check that it's close enough. */ > + igt_assert(result <= val + val * TOLERANCE / 100 && result >= val - val * TOLERANCE / 100); > +} > + > +static void test_brightness(int max) > +{ > + test_and_verify(0); > + test_and_verify(max); > + test_and_verify(max / 2); > +} > + > +static void test_bad_brightness(int max) > +{ > + int val; > + /* First write some sane value */ > + backlight_write(max / 2, "brightness"); > + /* Writing invalid values should fail and not change the value */ > + igt_assert(backlight_write(-1, "brightness") < 0); > + backlight_read(&val, "brightness"); > + igt_assert(val == max / 2); > + igt_assert(backlight_write(max + 1, "brightness") < 0); > + backlight_read(&val, "brightness"); > + igt_assert(val == max / 2); > + igt_assert(backlight_write(INT_MAX, "brightness") < 0); > + backlight_read(&val, "brightness"); > + igt_assert(val == max / 2); > +} > + > +static void test_fade(int max) > +{ > + int i; > + static const struct timespec ts = { .tv_sec = 0, .tv_nsec = FADESPEED*1000000 }; > + > + /* Fade out, then in */ > + for (i = max; i > 0; i -= max / FADESTEPS) { > + test_and_verify(i); > + nanosleep(&ts, NULL); > + } > + for (i = 0; i <= max; i += max / FADESTEPS) { > + test_and_verify(i); > + nanosleep(&ts, NULL); > + } > +} > + > +igt_main > +{ > + int max, old; > + > + igt_skip_on_simulation(); > + > + igt_fixture { > + /* 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(&max, "max_brightness") > -1); > + } > + > + igt_subtest("brightness") > + test_brightness(max); > + igt_subtest("bad-brightness") > + test_bad_brightness(max); > + igt_subtest("fade") > + test_fade(max); > + > + igt_fixture { > + /* Restore old brightness */ > + backlight_write(old, "brightness"); > + } > +} > -- > 1.8.3.2 > -- Jani Nikula, Intel Open Source Technology Center _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx