[PATCH i-g-t v3 1/3] lib/igt_kms: Move backlight read and write to lib
Santhosh Reddy Guddati
santhosh.reddy.guddati at intel.com
Tue Oct 22 12:10:40 UTC 2024
move backlight_read and backlight_write functions from
kms_pm_backlight to library to reuse in other tests.
move and rename struct context to intel_backlight_context_t.
v2: Rename backlight_read to igt_backlight_read and backlight_write to
backlight_write (Suraj).
Add a new member to intel_backlight_context_t to cache vendor specific
backlight path.
Signed-off-by: Santhosh Reddy Guddati <santhosh.reddy.guddati at intel.com>
---
lib/igt_kms.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++
lib/igt_kms.h | 12 ++++++++++
2 files changed, 78 insertions(+)
diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index bb35d4b82..5d8096a17 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -7119,3 +7119,69 @@ void igt_reset_link_params(int drm_fd, igt_output_t *output)
temp = drmModeGetConnector(drm_fd, output->config.connector->connector_id);
drmModeFreeConnector(temp);
}
+
+/**
+ * igt_backlight_read:
+ * @result: Pointer to store the result
+ * @fname: Name of the file to read
+ * @context: Pointer to the context structure
+ */
+int igt_backlight_read(int *result, const char *fname, igt_backlight_context_t *context)
+{
+ int fd;
+ char full[PATH_MAX];
+ char dst[64];
+ int r, e;
+
+ igt_assert(snprintf(full, PATH_MAX, "%s/%s/%s",
+ context->backlight_dir_path,
+ context->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;
+}
+
+/**
+ * igt_backlight_write:
+ * @value: Value to write
+ * @fname: Name of the file to write
+ * @context: Pointer to the context structure
+ */
+int igt_backlight_write(int value, const char *fname, igt_backlight_context_t *context)
+{
+ int fd;
+ char full[PATH_MAX];
+ char src[64];
+ int len;
+
+ igt_assert(snprintf(full, PATH_MAX, "%s/%s/%s",
+ context->backlight_dir_path,
+ context->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;
+}
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index 2b26d2bbf..bd154d1c1 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -33,6 +33,7 @@
#include <stdint.h>
#include <stddef.h>
#include <assert.h>
+#include <limits.h>
#include <xf86drmMode.h>
@@ -513,6 +514,15 @@ typedef struct {
uint16_t tile_h_size, tile_v_size;
} igt_tile_info_t;
+/* Backlight context*/
+typedef struct {
+ int max;
+ int old;
+ igt_output_t *output;
+ char path[PATH_MAX];
+ char backlight_dir_path[PATH_MAX];
+} igt_backlight_context_t;
+
void igt_display_reset_outputs(igt_display_t *display);
void igt_display_require(igt_display_t *display, int drm_fd);
void igt_display_fini(igt_display_t *display);
@@ -1253,5 +1263,7 @@ bool igt_has_force_link_training_failure_debugfs(int drmfd, igt_output_t *output
int igt_get_dp_pending_lt_failures(int drm_fd, igt_output_t *output);
int igt_get_dp_pending_retrain(int drm_fd, igt_output_t *output);
void igt_reset_link_params(int drm_fd, igt_output_t *output);
+int igt_backlight_read(int *result, const char *fname, igt_backlight_context_t *context);
+int igt_backlight_write(int value, const char *fname, igt_backlight_context_t *context);
#endif /* __IGT_KMS_H__ */
--
2.34.1
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