feat(reimaden): add platform support kernel module

spec/reimaden/ac71/hwmon_pwm.c

@@ -0,0 +1,122 @@
+// 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/lockdep.h>
+#include <linux/mutex.h>
+#include <linux/sysfs.h>
+#include <linux/types.h>
+
+#include "fan.h"
+#include "pdev.h"
+#include "util.h"
+
+/* ========================================================================== */
+
+static struct device *ac71_hwmon_pwm_dev;
+
+/* ========================================================================== */
+
+static umode_t ac71_hwmon_pwm_is_visible(const void *data, enum hwmon_sensor_types type,
+					 u32 attr, int channel)
+{
+	if (type != hwmon_pwm && attr != hwmon_pwm_enable)
+		return -EOPNOTSUPP;
+
+	return 0644;
+}
+
+static int ac71_hwmon_pwm_read(struct device *device, enum hwmon_sensor_types type,
+			       u32 attr, int channel, long *value)
+{
+	int err;
+
+	switch (type) {
+	case hwmon_pwm:
+		switch (attr) {
+		case hwmon_pwm_enable:
+			err = ac71_fan_get_mode();
+			if (err < 0)
+				return err;
+
+			*value = err;
+			break;
+		case hwmon_pwm_input:
+			err = ac71_fan_get_pwm(channel);
+			if (err < 0)
+				return err;
+
+			*value = err;
+			break;
+		default:
+			return -EOPNOTSUPP;
+		}
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static int ac71_hwmon_pwm_write(struct device *device, enum hwmon_sensor_types type,
+			    u32 attr, int channel, long value)
+{
+	switch (type) {
+	case hwmon_pwm:
+		switch (attr) {
+		case hwmon_pwm_enable:
+			return ac71_fan_set_mode(value);
+		case hwmon_pwm_input:
+			return ac71_fan_set_pwm(channel, value);
+		default:
+			return -EOPNOTSUPP;
+		}
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static const struct hwmon_channel_info *ac71_hwmon_pwm_ch_info[] = {
+	HWMON_CHANNEL_INFO(pwm, HWMON_PWM_ENABLE),
+	HWMON_CHANNEL_INFO(pwm, HWMON_PWM_INPUT, HWMON_PWM_INPUT),
+	NULL
+};
+
+static const struct hwmon_ops ac71_hwmon_pwm_ops = {
+	.is_visible  = ac71_hwmon_pwm_is_visible,
+	.read        = ac71_hwmon_pwm_read,
+	.write       = ac71_hwmon_pwm_write,
+};
+
+static const struct hwmon_chip_info ac71_hwmon_pwm_chip_info = {
+	.ops  = &ac71_hwmon_pwm_ops,
+	.info =  ac71_hwmon_pwm_ch_info,
+};
+
+/* ========================================================================== */
+
+int __init ac71_hwmon_pwm_setup(void)
+{
+	int err = 0;
+
+	ac71_hwmon_pwm_dev = hwmon_device_register_with_info(
+		&ac71_platform_dev->dev, KBUILD_MODNAME ".hwmon.pwm", NULL,
+		&ac71_hwmon_pwm_chip_info, NULL);
+
+	if (IS_ERR(ac71_hwmon_pwm_dev))
+		err = PTR_ERR(ac71_hwmon_pwm_dev);
+
+	return err;
+}
+
+void ac71_hwmon_pwm_cleanup(void)
+{
+	if (!IS_ERR_OR_NULL(ac71_hwmon_pwm_dev))
+		hwmon_device_unregister(ac71_hwmon_pwm_dev);
+}