spec(reimaden): add platform support kernel module

spec/reimaden/ac71/hwmon_fan.c

@@ -0,0 +1,152 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "pr.h"
+
+#include <linux/device.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/init.h>
+#include <linux/sysfs.h>
+#include <linux/types.h>
+
+#include "ec.h"
+#include "fan.h"
+#include "pdev.h"
+
+/* ========================================================================== */
+
+static struct device *ac71_hwmon_fan_dev;
+
+/* ========================================================================== */
+
+static umode_t ac71_hwmon_fan_is_visible(const void *data, enum hwmon_sensor_types type,
+					 u32 attr, int channel)
+{
+	switch (type) {
+	case hwmon_fan:
+		switch (attr) {
+		case hwmon_fan_input:
+		case hwmon_fan_fault:
+			return 0444;
+		}
+		break;
+	case hwmon_temp:
+		switch (attr) {
+		case hwmon_temp_input:
+		case hwmon_temp_label:
+			return 0444;
+		}
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static int ac71_hwmon_fan_read(struct device *device, enum hwmon_sensor_types type,
+			       u32 attr, int channel, long *value)
+{
+	int err;
+
+	switch (type) {
+	case hwmon_fan:
+		switch (attr) {
+		case hwmon_fan_input:
+			err = ac71_fan_get_rpm(channel);
+			if (err < 0)
+				return err;
+
+			*value = err;
+			break;
+		default:
+			return -EOPNOTSUPP;
+		}
+		break;
+	case hwmon_temp:
+		switch (attr) {
+		case hwmon_temp_input:
+			err = ac71_fan_get_temp(channel);
+			if (err < 0)
+				return err;
+
+			*value = err * 1000;
+			break;
+		default:
+			return -EOPNOTSUPP;
+		}
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static int ac71_hwmon_fan_read_string(struct device *dev, enum hwmon_sensor_types type,
+				      u32 attr, int channel, const char **str)
+{
+	static const char * const temp_labels[] = {
+		"fan1_temp",
+		"fan2_temp",
+	};
+
+	switch (type) {
+	case hwmon_temp:
+		switch (attr) {
+		case hwmon_temp_label:
+			*str = temp_labels[channel];
+			break;
+		default:
+			return -EOPNOTSUPP;
+		}
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+/* ========================================================================== */
+
+static const struct hwmon_channel_info *ac71_hwmon_fan_ch_info[] = {
+	HWMON_CHANNEL_INFO(fan,
+			   HWMON_F_INPUT,
+			   HWMON_F_INPUT),
+	HWMON_CHANNEL_INFO(temp,
+			   HWMON_T_INPUT | HWMON_T_LABEL,
+			   HWMON_T_INPUT | HWMON_T_LABEL),
+	NULL
+};
+
+static const struct hwmon_ops ac71_hwmon_fan_ops = {
+	.is_visible  = ac71_hwmon_fan_is_visible,
+	.read        = ac71_hwmon_fan_read,
+	.read_string = ac71_hwmon_fan_read_string,
+};
+
+static const struct hwmon_chip_info ac71_hwmon_fan_chip_info = {
+	.ops  = &ac71_hwmon_fan_ops,
+	.info =  ac71_hwmon_fan_ch_info,
+};
+
+/* ========================================================================== */
+
+int __init ac71_hwmon_fan_setup(void)
+{
+	int err = 0;
+
+	ac71_hwmon_fan_dev = hwmon_device_register_with_info(
+		&ac71_platform_dev->dev, KBUILD_MODNAME ".hwmon.fan", NULL,
+		&ac71_hwmon_fan_chip_info, NULL);
+
+	if (IS_ERR(ac71_hwmon_fan_dev))
+		err = PTR_ERR(ac71_hwmon_fan_dev);
+
+	return err;
+}
+
+void ac71_hwmon_fan_cleanup(void)
+{
+	if (!IS_ERR_OR_NULL(ac71_hwmon_fan_dev))
+		hwmon_device_unregister(ac71_hwmon_fan_dev);
+}