Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 768 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_hwmon.c b/drivers/gpu/drm/nouveau/nouveau_hwmon.c
new file mode 100644
index 000000000..08a1ab6b1
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nouveau_hwmon.c
@@ -0,0 +1,768 @@
+/*
+ * Copyright 2010 Red Hat Inc.
+ *
+ * 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 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
+ *
+ * Authors: Ben Skeggs
+ */
+
+#ifdef CONFIG_ACPI
+#include <linux/acpi.h>
+#endif
+#include <linux/power_supply.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+
+#include <drm/drmP.h>
+
+#include "nouveau_drv.h"
+#include "nouveau_hwmon.h"
+
+#include <nvkm/subdev/iccsense.h>
+#include <nvkm/subdev/volt.h>
+
+#if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))
+
+static ssize_t
+nouveau_hwmon_show_temp1_auto_point1_pwm(struct device *d,
+					 struct device_attribute *a, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%d\n", 100);
+}
+static SENSOR_DEVICE_ATTR(temp1_auto_point1_pwm, 0444,
+			  nouveau_hwmon_show_temp1_auto_point1_pwm, NULL, 0);
+
+static ssize_t
+nouveau_hwmon_temp1_auto_point1_temp(struct device *d,
+				     struct device_attribute *a, char *buf)
+{
+	struct drm_device *dev = dev_get_drvdata(d);
+	struct nouveau_drm *drm = nouveau_drm(dev);
+	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
+
+	return snprintf(buf, PAGE_SIZE, "%d\n",
+	      therm->attr_get(therm, NVKM_THERM_ATTR_THRS_FAN_BOOST) * 1000);
+}
+static ssize_t
+nouveau_hwmon_set_temp1_auto_point1_temp(struct device *d,
+					 struct device_attribute *a,
+					 const char *buf, size_t count)
+{
+	struct drm_device *dev = dev_get_drvdata(d);
+	struct nouveau_drm *drm = nouveau_drm(dev);
+	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
+	long value;
+
+	if (kstrtol(buf, 10, &value))
+		return -EINVAL;
+
+	therm->attr_set(therm, NVKM_THERM_ATTR_THRS_FAN_BOOST,
+			value / 1000);
+
+	return count;
+}
+static SENSOR_DEVICE_ATTR(temp1_auto_point1_temp, 0644,
+			  nouveau_hwmon_temp1_auto_point1_temp,
+			  nouveau_hwmon_set_temp1_auto_point1_temp, 0);
+
+static ssize_t
+nouveau_hwmon_temp1_auto_point1_temp_hyst(struct device *d,
+					  struct device_attribute *a, char *buf)
+{
+	struct drm_device *dev = dev_get_drvdata(d);
+	struct nouveau_drm *drm = nouveau_drm(dev);
+	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
+
+	return snprintf(buf, PAGE_SIZE, "%d\n",
+	 therm->attr_get(therm, NVKM_THERM_ATTR_THRS_FAN_BOOST_HYST) * 1000);
+}
+static ssize_t
+nouveau_hwmon_set_temp1_auto_point1_temp_hyst(struct device *d,
+					      struct device_attribute *a,
+					      const char *buf, size_t count)
+{
+	struct drm_device *dev = dev_get_drvdata(d);
+	struct nouveau_drm *drm = nouveau_drm(dev);
+	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
+	long value;
+
+	if (kstrtol(buf, 10, &value))
+		return -EINVAL;
+
+	therm->attr_set(therm, NVKM_THERM_ATTR_THRS_FAN_BOOST_HYST,
+			value / 1000);
+
+	return count;
+}
+static SENSOR_DEVICE_ATTR(temp1_auto_point1_temp_hyst, 0644,
+			  nouveau_hwmon_temp1_auto_point1_temp_hyst,
+			  nouveau_hwmon_set_temp1_auto_point1_temp_hyst, 0);
+
+static ssize_t
+nouveau_hwmon_get_pwm1_max(struct device *d,
+			   struct device_attribute *a, char *buf)
+{
+	struct drm_device *dev = dev_get_drvdata(d);
+	struct nouveau_drm *drm = nouveau_drm(dev);
+	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
+	int ret;
+
+	ret = therm->attr_get(therm, NVKM_THERM_ATTR_FAN_MAX_DUTY);
+	if (ret < 0)
+		return ret;
+
+	return sprintf(buf, "%i\n", ret);
+}
+
+static ssize_t
+nouveau_hwmon_get_pwm1_min(struct device *d,
+			   struct device_attribute *a, char *buf)
+{
+	struct drm_device *dev = dev_get_drvdata(d);
+	struct nouveau_drm *drm = nouveau_drm(dev);
+	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
+	int ret;
+
+	ret = therm->attr_get(therm, NVKM_THERM_ATTR_FAN_MIN_DUTY);
+	if (ret < 0)
+		return ret;
+
+	return sprintf(buf, "%i\n", ret);
+}
+
+static ssize_t
+nouveau_hwmon_set_pwm1_min(struct device *d, struct device_attribute *a,
+			   const char *buf, size_t count)
+{
+	struct drm_device *dev = dev_get_drvdata(d);
+	struct nouveau_drm *drm = nouveau_drm(dev);
+	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
+	long value;
+	int ret;
+
+	if (kstrtol(buf, 10, &value))
+		return -EINVAL;
+
+	ret = therm->attr_set(therm, NVKM_THERM_ATTR_FAN_MIN_DUTY, value);
+	if (ret < 0)
+		return ret;
+
+	return count;
+}
+static SENSOR_DEVICE_ATTR(pwm1_min, 0644,
+			  nouveau_hwmon_get_pwm1_min,
+			  nouveau_hwmon_set_pwm1_min, 0);
+
+static ssize_t
+nouveau_hwmon_set_pwm1_max(struct device *d, struct device_attribute *a,
+			   const char *buf, size_t count)
+{
+	struct drm_device *dev = dev_get_drvdata(d);
+	struct nouveau_drm *drm = nouveau_drm(dev);
+	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
+	long value;
+	int ret;
+
+	if (kstrtol(buf, 10, &value))
+		return -EINVAL;
+
+	ret = therm->attr_set(therm, NVKM_THERM_ATTR_FAN_MAX_DUTY, value);
+	if (ret < 0)
+		return ret;
+
+	return count;
+}
+static SENSOR_DEVICE_ATTR(pwm1_max, 0644,
+			  nouveau_hwmon_get_pwm1_max,
+			  nouveau_hwmon_set_pwm1_max, 0);
+
+static struct attribute *pwm_fan_sensor_attrs[] = {
+	&sensor_dev_attr_pwm1_min.dev_attr.attr,
+	&sensor_dev_attr_pwm1_max.dev_attr.attr,
+	NULL
+};
+static const struct attribute_group pwm_fan_sensor_group = {
+	.attrs = pwm_fan_sensor_attrs,
+};
+
+static struct attribute *temp1_auto_point_sensor_attrs[] = {
+	&sensor_dev_attr_temp1_auto_point1_pwm.dev_attr.attr,
+	&sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
+	&sensor_dev_attr_temp1_auto_point1_temp_hyst.dev_attr.attr,
+	NULL
+};
+static const struct attribute_group temp1_auto_point_sensor_group = {
+	.attrs = temp1_auto_point_sensor_attrs,
+};
+
+#define N_ATTR_GROUPS   3
+
+static const u32 nouveau_config_chip[] = {
+	HWMON_C_UPDATE_INTERVAL,
+	0
+};
+
+static const u32 nouveau_config_in[] = {
+	HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_LABEL,
+	0
+};
+
+static const u32 nouveau_config_temp[] = {
+	HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST |
+	HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_EMERGENCY |
+	HWMON_T_EMERGENCY_HYST,
+	0
+};
+
+static const u32 nouveau_config_fan[] = {
+	HWMON_F_INPUT,
+	0
+};
+
+static const u32 nouveau_config_pwm[] = {
+	HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
+	0
+};
+
+static const u32 nouveau_config_power[] = {
+	HWMON_P_INPUT | HWMON_P_CAP_MAX | HWMON_P_CRIT,
+	0
+};
+
+static const struct hwmon_channel_info nouveau_chip = {
+	.type = hwmon_chip,
+	.config = nouveau_config_chip,
+};
+
+static const struct hwmon_channel_info nouveau_temp = {
+	.type = hwmon_temp,
+	.config = nouveau_config_temp,
+};
+
+static const struct hwmon_channel_info nouveau_fan = {
+	.type = hwmon_fan,
+	.config = nouveau_config_fan,
+};
+
+static const struct hwmon_channel_info nouveau_in = {
+	.type = hwmon_in,
+	.config = nouveau_config_in,
+};
+
+static const struct hwmon_channel_info nouveau_pwm = {
+	.type = hwmon_pwm,
+	.config = nouveau_config_pwm,
+};
+
+static const struct hwmon_channel_info nouveau_power = {
+	.type = hwmon_power,
+	.config = nouveau_config_power,
+};
+
+static const struct hwmon_channel_info *nouveau_info[] = {
+	&nouveau_chip,
+	&nouveau_temp,
+	&nouveau_fan,
+	&nouveau_in,
+	&nouveau_pwm,
+	&nouveau_power,
+	NULL
+};
+
+static umode_t
+nouveau_chip_is_visible(const void *data, u32 attr, int channel)
+{
+	switch (attr) {
+	case hwmon_chip_update_interval:
+		return 0444;
+	default:
+		return 0;
+	}
+}
+
+static umode_t
+nouveau_power_is_visible(const void *data, u32 attr, int channel)
+{
+	struct nouveau_drm *drm = nouveau_drm((struct drm_device *)data);
+	struct nvkm_iccsense *iccsense = nvxx_iccsense(&drm->client.device);
+
+	if (!iccsense || !iccsense->data_valid || list_empty(&iccsense->rails))
+		return 0;
+
+	switch (attr) {
+	case hwmon_power_input:
+		return 0444;
+	case hwmon_power_max:
+		if (iccsense->power_w_max)
+			return 0444;
+		return 0;
+	case hwmon_power_crit:
+		if (iccsense->power_w_crit)
+			return 0444;
+		return 0;
+	default:
+		return 0;
+	}
+}
+
+static umode_t
+nouveau_temp_is_visible(const void *data, u32 attr, int channel)
+{
+	struct nouveau_drm *drm = nouveau_drm((struct drm_device *)data);
+	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
+
+	if (!therm || !therm->attr_get || nvkm_therm_temp_get(therm) < 0)
+		return 0;
+
+	switch (attr) {
+	case hwmon_temp_input:
+		return 0444;
+	case hwmon_temp_max:
+	case hwmon_temp_max_hyst:
+	case hwmon_temp_crit:
+	case hwmon_temp_crit_hyst:
+	case hwmon_temp_emergency:
+	case hwmon_temp_emergency_hyst:
+		return 0644;
+	default:
+		return 0;
+	}
+}
+
+static umode_t
+nouveau_pwm_is_visible(const void *data, u32 attr, int channel)
+{
+	struct nouveau_drm *drm = nouveau_drm((struct drm_device *)data);
+	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
+
+	if (!therm || !therm->attr_get || !therm->fan_get ||
+	    therm->fan_get(therm) < 0)
+		return 0;
+
+	switch (attr) {
+	case hwmon_pwm_enable:
+	case hwmon_pwm_input:
+		return 0644;
+	default:
+		return 0;
+	}
+}
+
+static umode_t
+nouveau_input_is_visible(const void *data, u32 attr, int channel)
+{
+	struct nouveau_drm *drm = nouveau_drm((struct drm_device *)data);
+	struct nvkm_volt *volt = nvxx_volt(&drm->client.device);
+
+	if (!volt || nvkm_volt_get(volt) < 0)
+		return 0;
+
+	switch (attr) {
+	case hwmon_in_input:
+	case hwmon_in_label:
+	case hwmon_in_min:
+	case hwmon_in_max:
+		return 0444;
+	default:
+		return 0;
+	}
+}
+
+static umode_t
+nouveau_fan_is_visible(const void *data, u32 attr, int channel)
+{
+	struct nouveau_drm *drm = nouveau_drm((struct drm_device *)data);
+	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
+
+	if (!therm || !therm->attr_get || nvkm_therm_fan_sense(therm) < 0)
+		return 0;
+
+	switch (attr) {
+	case hwmon_fan_input:
+		return 0444;
+	default:
+		return 0;
+	}
+}
+
+static int
+nouveau_chip_read(struct device *dev, u32 attr, int channel, long *val)
+{
+	switch (attr) {
+	case hwmon_chip_update_interval:
+		*val = 1000;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static int
+nouveau_temp_read(struct device *dev, u32 attr, int channel, long *val)
+{
+	struct drm_device *drm_dev = dev_get_drvdata(dev);
+	struct nouveau_drm *drm = nouveau_drm(drm_dev);
+	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
+	int ret;
+
+	if (!therm || !therm->attr_get)
+		return -EOPNOTSUPP;
+
+	switch (attr) {
+	case hwmon_temp_input:
+		ret = nvkm_therm_temp_get(therm);
+		*val = ret < 0 ? ret : (ret * 1000);
+		break;
+	case hwmon_temp_max:
+		*val = therm->attr_get(therm, NVKM_THERM_ATTR_THRS_DOWN_CLK)
+					* 1000;
+		break;
+	case hwmon_temp_max_hyst:
+		*val = therm->attr_get(therm, NVKM_THERM_ATTR_THRS_DOWN_CLK_HYST)
+					* 1000;
+		break;
+	case hwmon_temp_crit:
+		*val = therm->attr_get(therm, NVKM_THERM_ATTR_THRS_CRITICAL)
+					* 1000;
+		break;
+	case hwmon_temp_crit_hyst:
+		*val = therm->attr_get(therm, NVKM_THERM_ATTR_THRS_CRITICAL_HYST)
+					* 1000;
+		break;
+	case hwmon_temp_emergency:
+		*val = therm->attr_get(therm, NVKM_THERM_ATTR_THRS_SHUTDOWN)
+					* 1000;
+		break;
+	case hwmon_temp_emergency_hyst:
+		*val = therm->attr_get(therm, NVKM_THERM_ATTR_THRS_SHUTDOWN_HYST)
+					* 1000;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static int
+nouveau_fan_read(struct device *dev, u32 attr, int channel, long *val)
+{
+	struct drm_device *drm_dev = dev_get_drvdata(dev);
+	struct nouveau_drm *drm = nouveau_drm(drm_dev);
+	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
+
+	if (!therm)
+		return -EOPNOTSUPP;
+
+	switch (attr) {
+	case hwmon_fan_input:
+		*val = nvkm_therm_fan_sense(therm);
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static int
+nouveau_in_read(struct device *dev, u32 attr, int channel, long *val)
+{
+	struct drm_device *drm_dev = dev_get_drvdata(dev);
+	struct nouveau_drm *drm = nouveau_drm(drm_dev);
+	struct nvkm_volt *volt = nvxx_volt(&drm->client.device);
+	int ret;
+
+	if (!volt)
+		return -EOPNOTSUPP;
+
+	switch (attr) {
+	case hwmon_in_input:
+		ret = nvkm_volt_get(volt);
+		*val = ret < 0 ? ret : (ret / 1000);
+		break;
+	case hwmon_in_min:
+		*val = volt->min_uv > 0 ? (volt->min_uv / 1000) : -ENODEV;
+		break;
+	case hwmon_in_max:
+		*val = volt->max_uv > 0 ? (volt->max_uv / 1000) : -ENODEV;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static int
+nouveau_pwm_read(struct device *dev, u32 attr, int channel, long *val)
+{
+	struct drm_device *drm_dev = dev_get_drvdata(dev);
+	struct nouveau_drm *drm = nouveau_drm(drm_dev);
+	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
+
+	if (!therm || !therm->attr_get || !therm->fan_get)
+		return -EOPNOTSUPP;
+
+	switch (attr) {
+	case hwmon_pwm_enable:
+		*val = therm->attr_get(therm, NVKM_THERM_ATTR_FAN_MODE);
+		break;
+	case hwmon_pwm_input:
+		*val = therm->fan_get(therm);
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static int
+nouveau_power_read(struct device *dev, u32 attr, int channel, long *val)
+{
+	struct drm_device *drm_dev = dev_get_drvdata(dev);
+	struct nouveau_drm *drm = nouveau_drm(drm_dev);
+	struct nvkm_iccsense *iccsense = nvxx_iccsense(&drm->client.device);
+
+	if (!iccsense)
+		return -EOPNOTSUPP;
+
+	switch (attr) {
+	case hwmon_power_input:
+		*val = nvkm_iccsense_read_all(iccsense);
+		break;
+	case hwmon_power_max:
+		*val = iccsense->power_w_max;
+		break;
+	case hwmon_power_crit:
+		*val = iccsense->power_w_crit;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static int
+nouveau_temp_write(struct device *dev, u32 attr, int channel, long val)
+{
+	struct drm_device *drm_dev = dev_get_drvdata(dev);
+	struct nouveau_drm *drm = nouveau_drm(drm_dev);
+	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
+
+	if (!therm || !therm->attr_set)
+		return -EOPNOTSUPP;
+
+	switch (attr) {
+	case hwmon_temp_max:
+		return therm->attr_set(therm, NVKM_THERM_ATTR_THRS_DOWN_CLK,
+					val / 1000);
+	case hwmon_temp_max_hyst:
+		return therm->attr_set(therm, NVKM_THERM_ATTR_THRS_DOWN_CLK_HYST,
+					val / 1000);
+	case hwmon_temp_crit:
+		return therm->attr_set(therm, NVKM_THERM_ATTR_THRS_CRITICAL,
+					val / 1000);
+	case hwmon_temp_crit_hyst:
+		return therm->attr_set(therm, NVKM_THERM_ATTR_THRS_CRITICAL_HYST,
+					val / 1000);
+	case hwmon_temp_emergency:
+		return therm->attr_set(therm, NVKM_THERM_ATTR_THRS_SHUTDOWN,
+					val / 1000);
+	case hwmon_temp_emergency_hyst:
+		return therm->attr_set(therm, NVKM_THERM_ATTR_THRS_SHUTDOWN_HYST,
+					val / 1000);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int
+nouveau_pwm_write(struct device *dev, u32 attr, int channel, long val)
+{
+	struct drm_device *drm_dev = dev_get_drvdata(dev);
+	struct nouveau_drm *drm = nouveau_drm(drm_dev);
+	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
+
+	if (!therm || !therm->attr_set)
+		return -EOPNOTSUPP;
+
+	switch (attr) {
+	case hwmon_pwm_input:
+		return therm->fan_set(therm, val);
+	case hwmon_pwm_enable:
+		return therm->attr_set(therm, NVKM_THERM_ATTR_FAN_MODE, val);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static umode_t
+nouveau_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr,
+			int channel)
+{
+	switch (type) {
+	case hwmon_chip:
+		return nouveau_chip_is_visible(data, attr, channel);
+	case hwmon_temp:
+		return nouveau_temp_is_visible(data, attr, channel);
+	case hwmon_fan:
+		return nouveau_fan_is_visible(data, attr, channel);
+	case hwmon_in:
+		return nouveau_input_is_visible(data, attr, channel);
+	case hwmon_pwm:
+		return nouveau_pwm_is_visible(data, attr, channel);
+	case hwmon_power:
+		return nouveau_power_is_visible(data, attr, channel);
+	default:
+		return 0;
+	}
+}
+
+static const char input_label[] = "GPU core";
+
+static int
+nouveau_read_string(struct device *dev, enum hwmon_sensor_types type, u32 attr,
+		    int channel, const char **buf)
+{
+	if (type == hwmon_in && attr == hwmon_in_label) {
+		*buf = input_label;
+		return 0;
+	}
+
+	return -EOPNOTSUPP;
+}
+
+static int
+nouveau_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
+							int channel, long *val)
+{
+	switch (type) {
+	case hwmon_chip:
+		return nouveau_chip_read(dev, attr, channel, val);
+	case hwmon_temp:
+		return nouveau_temp_read(dev, attr, channel, val);
+	case hwmon_fan:
+		return nouveau_fan_read(dev, attr, channel, val);
+	case hwmon_in:
+		return nouveau_in_read(dev, attr, channel, val);
+	case hwmon_pwm:
+		return nouveau_pwm_read(dev, attr, channel, val);
+	case hwmon_power:
+		return nouveau_power_read(dev, attr, channel, val);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static int
+nouveau_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
+							int channel, long val)
+{
+	switch (type) {
+	case hwmon_temp:
+		return nouveau_temp_write(dev, attr, channel, val);
+	case hwmon_pwm:
+		return nouveau_pwm_write(dev, attr, channel, val);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static const struct hwmon_ops nouveau_hwmon_ops = {
+	.is_visible = nouveau_is_visible,
+	.read = nouveau_read,
+	.read_string = nouveau_read_string,
+	.write = nouveau_write,
+};
+
+static const struct hwmon_chip_info nouveau_chip_info = {
+	.ops = &nouveau_hwmon_ops,
+	.info = nouveau_info,
+};
+#endif
+
+int
+nouveau_hwmon_init(struct drm_device *dev)
+{
+#if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))
+	struct nouveau_drm *drm = nouveau_drm(dev);
+	struct nvkm_iccsense *iccsense = nvxx_iccsense(&drm->client.device);
+	struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
+	struct nvkm_volt *volt = nvxx_volt(&drm->client.device);
+	const struct attribute_group *special_groups[N_ATTR_GROUPS];
+	struct nouveau_hwmon *hwmon;
+	struct device *hwmon_dev;
+	int ret = 0;
+	int i = 0;
+
+	if (!iccsense && !therm && !volt) {
+		NV_DEBUG(drm, "Skipping hwmon registration\n");
+		return 0;
+	}
+
+	hwmon = drm->hwmon = kzalloc(sizeof(*hwmon), GFP_KERNEL);
+	if (!hwmon)
+		return -ENOMEM;
+	hwmon->dev = dev;
+
+	if (therm && therm->attr_get && therm->attr_set) {
+		if (nvkm_therm_temp_get(therm) >= 0)
+			special_groups[i++] = &temp1_auto_point_sensor_group;
+		if (therm->fan_get && therm->fan_get(therm) >= 0)
+			special_groups[i++] = &pwm_fan_sensor_group;
+	}
+
+	special_groups[i] = 0;
+	hwmon_dev = hwmon_device_register_with_info(dev->dev, "nouveau", dev,
+							&nouveau_chip_info,
+							special_groups);
+	if (IS_ERR(hwmon_dev)) {
+		ret = PTR_ERR(hwmon_dev);
+		NV_ERROR(drm, "Unable to register hwmon device: %d\n", ret);
+		return ret;
+	}
+
+	hwmon->hwmon = hwmon_dev;
+	return 0;
+#else
+	return 0;
+#endif
+}
+
+void
+nouveau_hwmon_fini(struct drm_device *dev)
+{
+#if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))
+	struct nouveau_hwmon *hwmon = nouveau_hwmon(dev);
+
+	if (!hwmon)
+		return;
+
+	if (hwmon->hwmon)
+		hwmon_device_unregister(hwmon->hwmon);
+
+	nouveau_drm(dev)->hwmon = NULL;
+	kfree(hwmon);
+#endif
+}