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-rw-r--r--drivers/misc/thinkpad_acpi.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index 6b93007..1dcf066 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -5983,6 +5983,52 @@ static void fan_exit(void)
flush_workqueue(tpacpi_wq);
}
+static void fan_suspend(pm_message_t state)
+{
+ if (!fan_control_allowed)
+ return;
+
+ /* Store fan status in cache */
+ fan_get_status_safe(NULL);
+ if (tp_features.fan_ctrl_status_undef)
+ fan_control_desired_level = TP_EC_FAN_AUTO;
+}
+
+static void fan_resume(void)
+{
+ u8 saved_fan_level;
+ u8 current_level = 7;
+ bool do_set = false;
+
+ /* DSDT *always* updates status on resume */
+ tp_features.fan_ctrl_status_undef = 0;
+
+ saved_fan_level = fan_control_desired_level;
+ if (!fan_control_allowed ||
+ (fan_get_status_safe(&current_level) < 0))
+ return;
+
+ switch (fan_control_access_mode) {
+ case TPACPI_FAN_WR_ACPI_SFAN:
+ do_set = (saved_fan_level > current_level);
+ break;
+ case TPACPI_FAN_WR_ACPI_FANS:
+ case TPACPI_FAN_WR_TPEC:
+ do_set = ((saved_fan_level & TP_EC_FAN_FULLSPEED) ||
+ (saved_fan_level == 7 &&
+ !(current_level & TP_EC_FAN_FULLSPEED)));
+ break;
+ default:
+ return;
+ }
+ if (do_set) {
+ printk(TPACPI_NOTICE
+ "restoring fan level to 0x%02x\n",
+ saved_fan_level);
+ fan_set_level_safe(saved_fan_level);
+ }
+}
+
static int fan_read(char *p)
{
int len = 0;
@@ -6174,6 +6220,8 @@ static struct ibm_struct fan_driver_data = {
.read = fan_read,
.write = fan_write,
.exit = fan_exit,
+ .suspend = fan_suspend,
+ .resume = fan_resume,
};
/****************************************************************************