From 00e69c8a86f9f42188fea455c2eb0797417ed7fc Mon Sep 17 00:00:00 2001
From: Riana Tauro <riana.tauro@intel.com>
Date: Mon, 17 Oct 2022 11:05:17 +0530
Subject: [PATCH] lib/igt_hwmon: Introduce library igt_hwmon
igt_hwmon exposes methods to open hwmon directories identified by name
v2: Add license(Petri)
Cc: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Riana Tauro <riana.tauro@intel.com>
Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
---
lib/igt_hwmon.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++++
lib/igt_hwmon.h | 13 +++++++++
lib/meson.build | 1 +
3 files changed, 88 insertions(+)
create mode 100644 lib/igt_hwmon.c
create mode 100644 lib/igt_hwmon.h
diff --git a/lib/igt_hwmon.c b/lib/igt_hwmon.c
new file mode 100644
index 000000000..309019d69
--- /dev/null
+++ b/lib/igt_hwmon.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <unistd.h>
+
+#include "drmtest.h"
+#include "igt_core.h"
+#include "igt_hwmon.h"
+#include "igt_sysfs.h"
+
+static char *igt_hwmon_path(int device, char *path, const char *name)
+{
+ char buf[80];
+ int path_offset;
+ struct dirent *entry;
+ struct stat st;
+ DIR *dir;
+
+ if (igt_debug_on(device < 0))
+ return NULL;
+
+ if (igt_debug_on(fstat(device, &st)) || igt_debug_on(!S_ISCHR(st.st_mode)))
+ return NULL;
+
+ path_offset = snprintf(path, PATH_MAX, "/sys/dev/char/%d:%d/device/hwmon",
+ major(st.st_rdev), minor(st.st_rdev));
+
+ dir = opendir(path);
+ if (!dir)
+ return NULL;
+
+ while ((entry = readdir(dir))) {
+ if (entry->d_name[0] == '.')
+ continue;
+
+ snprintf(path + path_offset, PATH_MAX - path_offset, "/%s/name", entry->d_name);
+ igt_sysfs_scanf(dirfd(dir), path, "%s", buf);
+
+ if (strncmp(buf, name, strlen(name)) == 0) {
+ snprintf(path + path_offset, PATH_MAX - path_offset, "/%s", entry->d_name);
+ closedir(dir);
+ return path;
+ }
+ }
+
+ closedir(dir);
+ return NULL;
+}
+
+/**
+ * igt_hwmon_open:
+ * @device: fd of the device
+ *
+ * Opens the hwmon directory corresponding to device
+ *
+ * Returns:
+ * The directory fd, or -1 on failure.
+ */
+int igt_hwmon_open(int device)
+{
+ char path[PATH_MAX];
+
+ if (!is_i915_device(device) || !igt_hwmon_path(device, path, "i915"))
+ return -1;
+
+ return open(path, O_RDONLY);
+}
+
diff --git a/lib/igt_hwmon.h b/lib/igt_hwmon.h
new file mode 100644
index 000000000..e50c09389
--- /dev/null
+++ b/lib/igt_hwmon.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#ifndef IGT_HWMON_H
+#define IGT_HWMON_H
+
+#include <stdbool.h>
+
+int igt_hwmon_open(int device);
+
+#endif /* IGT_HWMON_H */
diff --git a/lib/meson.build b/lib/meson.build
index c665bd250..b1b8e80cb 100644
--- a/lib/meson.build
+++ b/lib/meson.build
@@ -24,6 +24,7 @@ lib_sources = [
'igt_aux.c',
'igt_gt.c',
'igt_halffloat.c',
+ 'igt_hwmon.c',
'igt_io.c',
'igt_matrix.c',
'igt_os.c',
--
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