drm/radeon/kms: add support for internal thermal sensors (v3)

[mv-sheeva.git] / drivers / gpu / drm / radeon / radeon_pm.c

diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
index 115d26b762cc2b3db9301c86e66d97505f6fd291..ed66062ae9d0044601e843a2caa937559d361d78 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -27,6 +27,8 @@
 #include <linux/acpi.h>
 #endif
 #include <linux/power_supply.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
 
 #define RADEON_IDLE_LOOP_MS 100
 #define RADEON_RECLOCK_DELAY_MS 200
@@ -423,6 +425,82 @@ fail:
 static DEVICE_ATTR(power_profile, S_IRUGO | S_IWUSR, radeon_get_pm_profile, radeon_set_pm_profile);
 static DEVICE_ATTR(power_method, S_IRUGO | S_IWUSR, radeon_get_pm_method, radeon_set_pm_method);
 
+static ssize_t radeon_hwmon_show_temp(struct device *dev,
+                                     struct device_attribute *attr,
+                                     char *buf)
+{
+       struct drm_device *ddev = pci_get_drvdata(to_pci_dev(dev));
+       struct radeon_device *rdev = ddev->dev_private;
+       u32 temp;
+
+       switch (rdev->pm.int_thermal_type) {
+       case THERMAL_TYPE_RV6XX:
+               temp = rv6xx_get_temp(rdev);
+               break;
+       case THERMAL_TYPE_RV770:
+               temp = rv770_get_temp(rdev);
+               break;
+       case THERMAL_TYPE_EVERGREEN:
+               temp = evergreen_get_temp(rdev);
+               break;
+       default:
+               temp = 0;
+               break;
+       }
+
+       return snprintf(buf, PAGE_SIZE, "%d\n", temp);
+}
+
+static ssize_t radeon_hwmon_show_name(struct device *dev,
+                                     struct device_attribute *attr,
+                                     char *buf)
+{
+       return sprintf(buf, "radeon\n");
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, radeon_hwmon_show_temp, NULL, 0);
+static SENSOR_DEVICE_ATTR(name, S_IRUGO, radeon_hwmon_show_name, NULL, 0);
+
+static struct attribute *hwmon_attributes[] = {
+       &sensor_dev_attr_temp1_input.dev_attr.attr,
+       &sensor_dev_attr_name.dev_attr.attr,
+       NULL
+};
+
+static const struct attribute_group hwmon_attrgroup = {
+       .attrs = hwmon_attributes,
+};
+
+static void radeon_hwmon_init(struct radeon_device *rdev)
+{
+       int err;
+
+       rdev->pm.int_hwmon_dev = NULL;
+
+       switch (rdev->pm.int_thermal_type) {
+       case THERMAL_TYPE_RV6XX:
+       case THERMAL_TYPE_RV770:
+       case THERMAL_TYPE_EVERGREEN:
+               rdev->pm.int_hwmon_dev = hwmon_device_register(rdev->dev);
+               dev_set_drvdata(rdev->pm.int_hwmon_dev, rdev->ddev);
+               err = sysfs_create_group(&rdev->pm.int_hwmon_dev->kobj,
+                                        &hwmon_attrgroup);
+               if (err)
+                       DRM_ERROR("Unable to create hwmon sysfs file: %d\n", err);
+               break;
+       default:
+               break;
+       }
+}
+
+static void radeon_hwmon_fini(struct radeon_device *rdev)
+{
+       if (rdev->pm.int_hwmon_dev) {
+               sysfs_remove_group(&rdev->pm.int_hwmon_dev->kobj, &hwmon_attrgroup);
+               hwmon_device_unregister(rdev->pm.int_hwmon_dev);
+       }
+}
+
 void radeon_pm_suspend(struct radeon_device *rdev)
 {
        bool flush_wq = false;
@@ -470,6 +548,7 @@ int radeon_pm_init(struct radeon_device *rdev)
        rdev->pm.dynpm_can_downclock = true;
        rdev->pm.current_sclk = rdev->clock.default_sclk;
        rdev->pm.current_mclk = rdev->clock.default_mclk;
+       rdev->pm.int_thermal_type = THERMAL_TYPE_NONE;
 
        if (rdev->bios) {
                if (rdev->is_atom_bios)
@@ -480,6 +559,8 @@ int radeon_pm_init(struct radeon_device *rdev)
                radeon_pm_init_profile(rdev);
        }
 
+       /* set up the internal thermal sensor if applicable */
+       radeon_hwmon_init(rdev);
        if (rdev->pm.num_power_states > 1) {
                /* where's the best place to put these? */
                ret = device_create_file(rdev->dev, &dev_attr_power_profile);
@@ -535,6 +616,7 @@ void radeon_pm_fini(struct radeon_device *rdev)
 #endif
        }
 
+       radeon_hwmon_fini(rdev);
        if (rdev->pm.i2c_bus)
                radeon_i2c_destroy(rdev->pm.i2c_bus);
 }