From b7e43781c014ce86959035538d172350cbf4c622 Mon Sep 17 00:00:00 2001
From: Daniel Drake <dsd@laptop.org>
Date: Mon, 5 Mar 2012 15:01:00 -0800
Subject: [PATCH] --- yaml --- r: 292775 b: refs/heads/master c:
 d1f42e314c9c50541c79a6edf2b4cab63fe02ee3 h: refs/heads/master i:   292773:
 e17bf74ef548ba4eba9c392b07510463e7f590b8   292771:
 b31f6e35aa3c2fa47644b261edfc531a71abf382   292767:
 952bfa2ee4f5cb0478f6e4d828468cd7750076e5 v: v3

---
 [refs]                                       |  2 +-
 trunk/arch/x86/platform/olpc/olpc-xo15-sci.c | 72 +++++++++++++++++++-
 2 files changed, 72 insertions(+), 2 deletions(-)

diff --git a/[refs] b/[refs]
index f08d2ecac5f9..a567c73c4dc8 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: da4e3302949f4a702f1ddfefe067762232d363d5
+refs/heads/master: d1f42e314c9c50541c79a6edf2b4cab63fe02ee3
diff --git a/trunk/arch/x86/platform/olpc/olpc-xo15-sci.c b/trunk/arch/x86/platform/olpc/olpc-xo15-sci.c
index 2b235b77d9ab..23e5b9d7977b 100644
--- a/trunk/arch/x86/platform/olpc/olpc-xo15-sci.c
+++ b/trunk/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;
 }