Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 235 insertions, 0 deletions

diff --git a/arch/x86/platform/olpc/olpc-xo15-sci.c b/arch/x86/platform/olpc/olpc-xo15-sci.c
new file mode 100644
index 000000000..c0533fbc3
--- /dev/null
+++ b/arch/x86/platform/olpc/olpc-xo15-sci.c
@@ -0,0 +1,235 @@
+/*
+ * Support for OLPC XO-1.5 System Control Interrupts (SCI)
+ *
+ * Copyright (C) 2009-2010 One Laptop per Child
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <linux/power_supply.h>
+#include <linux/olpc-ec.h>
+
+#include <linux/acpi.h>
+#include <asm/olpc.h>
+
+#define DRV_NAME			"olpc-xo15-sci"
+#define PFX				DRV_NAME ": "
+#define XO15_SCI_CLASS			DRV_NAME
+#define XO15_SCI_DEVICE_NAME		"OLPC XO-1.5 SCI"
+
+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)
+{
+	acpi_status status;
+
+	status = acpi_execute_simple_method(NULL, "\\_SB.PCI0.LID.LIDW", wake_on_close);
+	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)
+{
+	struct power_supply *psy = power_supply_get_by_name("olpc-battery");
+
+	if (psy) {
+		power_supply_changed(psy);
+		power_supply_put(psy);
+	}
+}
+
+static void ac_status_changed(void)
+{
+	struct power_supply *psy = power_supply_get_by_name("olpc-ac");
+
+	if (psy) {
+		power_supply_changed(psy);
+		power_supply_put(psy);
+	}
+}
+
+static void process_sci_queue(void)
+{
+	u16 data;
+	int r;
+
+	do {
+		r = olpc_ec_sci_query(&data);
+		if (r || !data)
+			break;
+
+		pr_debug(PFX "SCI 0x%x received\n", data);
+
+		switch (data) {
+		case EC_SCI_SRC_BATERR:
+		case EC_SCI_SRC_BATSOC:
+		case EC_SCI_SRC_BATTERY:
+		case EC_SCI_SRC_BATCRIT:
+			battery_status_changed();
+			break;
+		case EC_SCI_SRC_ACPWR:
+			ac_status_changed();
+			break;
+		}
+	} while (data);
+
+	if (r)
+		pr_err(PFX "Failed to clear SCI queue");
+}
+
+static void process_sci_queue_work(struct work_struct *work)
+{
+	process_sci_queue();
+}
+
+static DECLARE_WORK(sci_work, process_sci_queue_work);
+
+static u32 xo15_sci_gpe_handler(acpi_handle gpe_device, u32 gpe, void *context)
+{
+	schedule_work(&sci_work);
+	return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE;
+}
+
+static int xo15_sci_add(struct acpi_device *device)
+{
+	unsigned long long tmp;
+	acpi_status status;
+	int r;
+
+	if (!device)
+		return -EINVAL;
+
+	strcpy(acpi_device_name(device), XO15_SCI_DEVICE_NAME);
+	strcpy(acpi_device_class(device), XO15_SCI_CLASS);
+
+	/* Get GPE bit assignment (EC events). */
+	status = acpi_evaluate_integer(device->handle, "_GPE", NULL, &tmp);
+	if (ACPI_FAILURE(status))
+		return -EINVAL;
+
+	xo15_sci_gpe = tmp;
+	status = acpi_install_gpe_handler(NULL, xo15_sci_gpe,
+					  ACPI_GPE_EDGE_TRIGGERED,
+					  xo15_sci_gpe_handler, device);
+	if (ACPI_FAILURE(status))
+		return -ENODEV;
+
+	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);
+
+	acpi_enable_gpe(NULL, xo15_sci_gpe);
+
+	/* Enable wake-on-EC */
+	if (device->wakeup.flags.valid)
+		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)
+{
+	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;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int xo15_sci_resume(struct device *dev)
+{
+	/* Enable all EC events */
+	olpc_ec_mask_write(EC_SCI_SRC_ALL);
+
+	/* Power/battery status might have changed */
+	battery_status_changed();
+	ac_status_changed();
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(xo15_sci_pm, NULL, xo15_sci_resume);
+
+static const struct acpi_device_id xo15_sci_device_ids[] = {
+	{"XO15EC", 0},
+	{"", 0},
+};
+
+static struct acpi_driver xo15_sci_drv = {
+	.name = DRV_NAME,
+	.class = XO15_SCI_CLASS,
+	.ids = xo15_sci_device_ids,
+	.ops = {
+		.add = xo15_sci_add,
+		.remove = xo15_sci_remove,
+	},
+	.drv.pm = &xo15_sci_pm,
+};
+
+static int __init xo15_sci_init(void)
+{
+	return acpi_bus_register_driver(&xo15_sci_drv);
+}
+device_initcall(xo15_sci_init);