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-rw-r--r--arch/x86/platform/olpc/olpc-xo15-sci.c72
1 files changed, 71 insertions, 1 deletions
diff --git a/arch/x86/platform/olpc/olpc-xo15-sci.c b/arch/x86/platform/olpc/olpc-xo15-sci.c
index 2b235b7..23e5b9d 100644
--- a/arch/x86/platform/olpc/olpc-xo15-sci.c
+++ b/arch/x86/platform/olpc/olpc-xo15-sci.c
@@ -23,7 +23,66 @@
#define XO15_SCI_CLASS DRV_NAME
#define XO15_SCI_DEVICE_NAME "OLPC XO-1.5 SCI"
-static unsigned long xo15_sci_gpe;
+static unsigned long xo15_sci_gpe;
+static bool lid_wake_on_close;
+
+/*
+ * The normal ACPI LID wakeup behavior is wake-on-open, but not
+ * wake-on-close. This is implemented as standard by the XO-1.5 DSDT.
+ *
+ * We provide here a sysfs attribute that will additionally enable
+ * wake-on-close behavior. This is useful (e.g.) when we oportunistically
+ * suspend with the display running; if the lid is then closed, we want to
+ * wake up to turn the display off.
+ *
+ * This is controlled through a custom method in the XO-1.5 DSDT.
+ */
+static int set_lid_wake_behavior(bool wake_on_close)
+{
+ struct acpi_object_list arg_list;
+ union acpi_object arg;
+ acpi_status status;
+
+ arg_list.count = 1;
+ arg_list.pointer = &arg;
+ arg.type = ACPI_TYPE_INTEGER;
+ arg.integer.value = wake_on_close;
+
+ status = acpi_evaluate_object(NULL, "\\_SB.PCI0.LID.LIDW", &arg_list, NULL);
+ if (ACPI_FAILURE(status)) {
+ pr_warning(PFX "failed to set lid behavior\n");
+ return 1;
+ }
+
+ lid_wake_on_close = wake_on_close;
+
+ return 0;
+}
+
+static ssize_t
+lid_wake_on_close_show(struct kobject *s, struct kobj_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%u\n", lid_wake_on_close);
+}
+
+static ssize_t lid_wake_on_close_store(struct kobject *s,
+ struct kobj_attribute *attr,
+ const char *buf, size_t n)
+{
+ unsigned int val;
+
+ if (sscanf(buf, "%u", &val) != 1)
+ return -EINVAL;
+
+ set_lid_wake_behavior(!!val);
+
+ return n;
+}
+
+static struct kobj_attribute lid_wake_on_close_attr =
+ __ATTR(lid_wake_on_close, 0644,
+ lid_wake_on_close_show,
+ lid_wake_on_close_store);
static void battery_status_changed(void)
{
@@ -91,6 +150,7 @@ static int xo15_sci_add(struct acpi_device *device)
{
unsigned long long tmp;
acpi_status status;
+ int r;
if (!device)
return -EINVAL;
@@ -112,6 +172,10 @@ static int xo15_sci_add(struct acpi_device *device)
dev_info(&device->dev, "Initialized, GPE = 0x%lx\n", xo15_sci_gpe);
+ r = sysfs_create_file(&device->dev.kobj, &lid_wake_on_close_attr.attr);
+ if (r)
+ goto err_sysfs;
+
/* Flush queue, and enable all SCI events */
process_sci_queue();
olpc_ec_mask_write(EC_SCI_SRC_ALL);
@@ -123,6 +187,11 @@ static int xo15_sci_add(struct acpi_device *device)
device_init_wakeup(&device->dev, true);
return 0;
+
+err_sysfs:
+ acpi_remove_gpe_handler(NULL, xo15_sci_gpe, xo15_sci_gpe_handler);
+ cancel_work_sync(&sci_work);
+ return r;
}
static int xo15_sci_remove(struct acpi_device *device, int type)
@@ -130,6 +199,7 @@ static int xo15_sci_remove(struct acpi_device *device, int type)
acpi_disable_gpe(NULL, xo15_sci_gpe);
acpi_remove_gpe_handler(NULL, xo15_sci_gpe, xo15_sci_gpe_handler);
cancel_work_sync(&sci_work);
+ sysfs_remove_file(&device->dev.kobj, &lid_wake_on_close_attr.attr);
return 0;
}
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