[PATCH 2/2] drm/amdgpu: add sysfs for current gpu voltage.

[Rex Zhu]

Change-Id: I348f9307c8e03e193df481e6c9faf234039d97b5
Signed-off-by: Rex Zhu <Rex.Zhu at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_dpm.h |  4 +++
 drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c  | 50 +++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dpm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_dpm.h
index f187680..3b77966 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dpm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dpm.h
@@ -414,6 +414,10 @@ struct amdgpu_dpm_funcs {
 	((adev)->powerplay.pp_funcs->switch_power_profile(\
 			(adev)->powerplay.pp_handle, type))
 
+#define amdgpu_get_voltage(adev, type, vol) \
+	((adev)->powerplay.pp_funcs->get_gpu_voltage(\
+			(adev)->powerplay.pp_handle, type, vol))
+
 struct amdgpu_dpm {
 	struct amdgpu_ps        *ps;
 	/* number of valid power states */
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index f435275..20dcf06 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -958,6 +958,52 @@ static ssize_t amdgpu_hwmon_get_fan1_input(struct device *dev,
 	return sprintf(buf, "%i\n", speed);
 }
 
+
+static ssize_t amdgpu_hwmon_show_vddc(struct device *dev,
+					   struct device_attribute *attr,
+					   char *buf)
+{
+	struct amdgpu_device *adev = dev_get_drvdata(dev);
+	u32 vol = 0;
+
+	if (adev->pp_enabled)
+		amdgpu_get_voltage(adev, PP_VDDC, &vol);
+
+	return sprintf(buf, "%i\n", vol >> 15);  /* voltage in unit of mv */
+
+}
+
+
+static ssize_t amdgpu_hwmon_set_vddc(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	/* to do */
+	return count;
+}
+
+static ssize_t amdgpu_hwmon_show_vddci(struct device *dev,
+					   struct device_attribute *attr,
+					   char *buf)
+{
+	struct amdgpu_device *adev = dev_get_drvdata(dev);
+	u32 vol = 0;
+
+	if (adev->pp_enabled)
+		amdgpu_get_voltage(adev, PP_VDDCI, &vol);
+
+	return sprintf(buf, "%i\n", vol >> 15); /* voltage in unit of mv */
+}
+
+
+static ssize_t amdgpu_hwmon_set_vddci(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	/* to do */
+	return count;
+}
+
 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, amdgpu_hwmon_show_temp, NULL, 0);
 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, amdgpu_hwmon_show_temp_thresh, NULL, 0);
 static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, amdgpu_hwmon_show_temp_thresh, NULL, 1);
@@ -966,6 +1012,8 @@ static ssize_t amdgpu_hwmon_get_fan1_input(struct device *dev,
 static SENSOR_DEVICE_ATTR(pwm1_min, S_IRUGO, amdgpu_hwmon_get_pwm1_min, NULL, 0);
 static SENSOR_DEVICE_ATTR(pwm1_max, S_IRUGO, amdgpu_hwmon_get_pwm1_max, NULL, 0);
 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, amdgpu_hwmon_get_fan1_input, NULL, 0);
+static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO | S_IWUSR, amdgpu_hwmon_show_vddc, amdgpu_hwmon_set_vddc, 0);
+static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO | S_IWUSR, amdgpu_hwmon_show_vddci, amdgpu_hwmon_set_vddci, 0);
 
 static struct attribute *hwmon_attributes[] = {
 	&sensor_dev_attr_temp1_input.dev_attr.attr,
@@ -976,6 +1024,8 @@ static ssize_t amdgpu_hwmon_get_fan1_input(struct device *dev,
 	&sensor_dev_attr_pwm1_min.dev_attr.attr,
 	&sensor_dev_attr_pwm1_max.dev_attr.attr,
 	&sensor_dev_attr_fan1_input.dev_attr.attr,
+	&sensor_dev_attr_in0_input.dev_attr.attr,
+	&sensor_dev_attr_in1_input.dev_attr.attr,
 	NULL
 };
 
-- 
1.9.1