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platform/surface: platform_profile: add fan power state handling #166

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platform/surface: platform_profile: add fan power state handling #166

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63 changes: 63 additions & 0 deletions drivers/platform/surface/surface_platform_profile.c
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,11 @@ enum ssam_fan_profile {
SSAM_FAN_PROFILE_BEST_PERFORMANCE = 4,
};

enum ssam_fan_state {
SSAM_FAN_STATE_NORMAL = 1,
SSAM_FAN_STATE_STANDBY = 2,
};

struct ssam_tmp_profile_info {
__le32 profile;
__le16 unknown1;
Expand Down Expand Up @@ -61,6 +66,13 @@ SSAM_DEFINE_SYNC_REQUEST_W(__ssam_fan_profile_set, u8, {
.instance_id = 0x01,
});

SSAM_DEFINE_SYNC_REQUEST_W(__ssam_fan_state_set, u8, {
.target_category = SSAM_SSH_TC_FAN,
.target_id = SSAM_SSH_TID_SAM,
.command_id = 0x0f,
.instance_id = 0x01,
});

static int ssam_tmp_profile_get(struct ssam_device *sdev, enum ssam_tmp_profile *p)
{
struct ssam_tmp_profile_info info;
Expand Down Expand Up @@ -88,6 +100,13 @@ static int ssam_fan_profile_set(struct ssam_device *sdev, enum ssam_fan_profile
return ssam_retry(__ssam_fan_profile_set, sdev->ctrl, &profile);
}

static int ssam_fan_state_set(struct ssam_device *sdev, enum ssam_fan_state s)
{
const u8 state = s;

return ssam_retry(__ssam_fan_state_set, sdev->ctrl, &state);
}

static int convert_ssam_tmp_to_profile(struct ssam_device *sdev, enum ssam_tmp_profile p)
{
switch (p) {
Expand Down Expand Up @@ -236,6 +255,49 @@ static int surface_platform_profile_probe(struct ssam_device *sdev)
return PTR_ERR_OR_ZERO(tpd->ppdev);
}

#ifdef CONFIG_PM_SLEEP

static int surface_platform_profile_pm_prepare(struct device *dev)
{
struct ssam_platform_profile_device *tpd;
int status;

tpd = dev_get_drvdata(dev);

if (tpd->has_fan) {
status = ssam_fan_state_set(tpd->sdev, SSAM_FAN_STATE_STANDBY);
if (status)
dev_err(&tpd->sdev->dev, "pm: fan standby notification failed");
}

return status;
}

static void surface_platform_profile_pm_complete(struct device *dev)
{
struct ssam_platform_profile_device *tpd;
int status;

tpd = dev_get_drvdata(dev);

if (tpd->has_fan) {
status = ssam_fan_state_set(tpd->sdev, SSAM_FAN_STATE_NORMAL);
if (status)
dev_err(&tpd->sdev->dev, "pm: fan resume notification failed");
}
}

static const struct dev_pm_ops surface_platform_profile_pm_ops = {
.prepare = surface_platform_profile_pm_prepare,
.complete = surface_platform_profile_pm_complete,
};

#else /* CONFIG_PM_SLEEP */

static const struct dev_pm_ops surface_platform_profile_pm_ops = { };

#endif /* CONFIG_PM_SLEEP */

static const struct ssam_device_id ssam_platform_profile_match[] = {
{ SSAM_SDEV(TMP, SAM, 0x00, 0x01) },
{ },
Expand All @@ -247,6 +309,7 @@ static struct ssam_device_driver surface_platform_profile = {
.match_table = ssam_platform_profile_match,
.driver = {
.name = "surface_platform_profile",
.pm = &surface_platform_profile_pm_ops,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
};
Expand Down