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authorMatthew Garrett <mjg59@srcf.ucam.org>2013-07-03 02:41:03 +0400
committerMatthew Garrett <matthew.garrett@nebula.com>2013-07-10 23:42:48 +0400
commit34a956db3774e8cba3f6b52aa9c1d67cf9a496fe (patch)
treefbc6a170ee548c9cf4a170bd6e399bfe5fd1f557 /drivers/platform
parent8667ca9518bbe0eff2222e69d611f4c8549fcbde (diff)
downloadlinux-34a956db3774e8cba3f6b52aa9c1d67cf9a496fe.tar.xz
Add support driver for Intel Rapid Start Technology
Intel Rapid Start Technology is a firmware-based suspend-to-disk implementation. Once placed in S3, the device will wake once either a timeout elapses or the battery reaches a critical level. It will then resume to the firmware and copy the contents of RAM to a specialised partition, and then power off the machine. If the user turns the machine back on the firmware will copy the contents of the partition back to RAM and then resume from S3 as normal. This driver provides an interface for configuring the wakeup events and timeout. It still requires firmware support and an appropriate suspend partition. Signed-off-by: Matthew Garrett <mjg59@srcf.ucam.org> Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
Diffstat (limited to 'drivers/platform')
-rw-r--r--drivers/platform/x86/Kconfig12
-rw-r--r--drivers/platform/x86/Makefile1
-rw-r--r--drivers/platform/x86/intel-rst.c209
3 files changed, 222 insertions, 0 deletions
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 37645b923c52..36057f481162 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -782,6 +782,18 @@ config APPLE_GMUX
graphics as well as the backlight. Currently only backlight
control is supported by the driver.
+config INTEL_RST
+ tristate "Intel Rapid Start Technology Driver"
+ depends on ACPI
+ ---help---
+ This driver provides support for modifying paramaters on systems
+ equipped with Intel's Rapid Start Technology. When put in an ACPI
+ sleep state, these devices will wake after either a configured
+ timeout or when the system battery reaches a critical state,
+ automatically copying memory contents to disk. On resume, the
+ firmware will copy the memory contents back to RAM and resume the OS
+ as usual.
+
config PVPANIC
tristate "pvpanic device support"
depends on ACPI
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index ef0ec746f78c..5c669ce8d243 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -51,5 +51,6 @@ obj-$(CONFIG_INTEL_OAKTRAIL) += intel_oaktrail.o
obj-$(CONFIG_SAMSUNG_Q10) += samsung-q10.o
obj-$(CONFIG_APPLE_GMUX) += apple-gmux.o
obj-$(CONFIG_CHROMEOS_LAPTOP) += chromeos_laptop.o
+obj-$(CONFIG_INTEL_RST) += intel-rst.o
obj-$(CONFIG_PVPANIC) += pvpanic.o
diff --git a/drivers/platform/x86/intel-rst.c b/drivers/platform/x86/intel-rst.c
new file mode 100644
index 000000000000..9385afd9b558
--- /dev/null
+++ b/drivers/platform/x86/intel-rst.c
@@ -0,0 +1,209 @@
+/*
+ * Copyright 2013 Matthew Garrett <mjg59@srcf.ucam.org>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <acpi/acpi_drivers.h>
+
+MODULE_LICENSE("GPL");
+
+static ssize_t irst_show_wakeup_events(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct acpi_device *acpi;
+ struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+ union acpi_object *result;
+ acpi_status status;
+
+ acpi = to_acpi_device(dev);
+
+ status = acpi_evaluate_object(acpi->handle, "GFFS", NULL, &output);
+ if (!ACPI_SUCCESS(status))
+ return -EINVAL;
+
+ result = output.pointer;
+
+ if (result->type != ACPI_TYPE_INTEGER) {
+ kfree(result);
+ return -EINVAL;
+ }
+
+ return sprintf(buf, "%lld\n", result->integer.value);
+}
+
+static ssize_t irst_store_wakeup_events(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct acpi_device *acpi;
+ struct acpi_object_list input;
+ union acpi_object param;
+ acpi_status status;
+ unsigned long value;
+ int error;
+
+ acpi = to_acpi_device(dev);
+
+ error = kstrtoul(buf, 0, &value);
+
+ if (error)
+ return error;
+
+ param.type = ACPI_TYPE_INTEGER;
+ param.integer.value = value;
+
+ input.count = 1;
+ input.pointer = &param;
+
+ status = acpi_evaluate_object(acpi->handle, "SFFS", &input, NULL);
+
+ if (!ACPI_SUCCESS(status))
+ return -EINVAL;
+
+ return count;
+}
+
+static struct device_attribute irst_wakeup_attr = {
+ .attr = { .name = "wakeup_events", .mode = 0600 },
+ .show = irst_show_wakeup_events,
+ .store = irst_store_wakeup_events
+};
+
+static ssize_t irst_show_wakeup_time(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct acpi_device *acpi;
+ struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+ union acpi_object *result;
+ acpi_status status;
+
+ acpi = to_acpi_device(dev);
+
+ status = acpi_evaluate_object(acpi->handle, "GFTV", NULL, &output);
+ if (!ACPI_SUCCESS(status))
+ return -EINVAL;
+
+ result = output.pointer;
+
+ if (result->type != ACPI_TYPE_INTEGER) {
+ kfree(result);
+ return -EINVAL;
+ }
+
+ return sprintf(buf, "%lld\n", result->integer.value);
+}
+
+static ssize_t irst_store_wakeup_time(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct acpi_device *acpi;
+ struct acpi_object_list input;
+ union acpi_object param;
+ acpi_status status;
+ unsigned long value;
+ int error;
+
+ acpi = to_acpi_device(dev);
+
+ error = kstrtoul(buf, 0, &value);
+
+ if (error)
+ return error;
+
+ param.type = ACPI_TYPE_INTEGER;
+ param.integer.value = value;
+
+ input.count = 1;
+ input.pointer = &param;
+
+ status = acpi_evaluate_object(acpi->handle, "SFTV", &input, NULL);
+
+ if (!ACPI_SUCCESS(status))
+ return -EINVAL;
+
+ return count;
+}
+
+static struct device_attribute irst_timeout_attr = {
+ .attr = { .name = "wakeup_time", .mode = 0600 },
+ .show = irst_show_wakeup_time,
+ .store = irst_store_wakeup_time
+};
+
+static int irst_add(struct acpi_device *acpi)
+{
+ int error = 0;
+
+ error = device_create_file(&acpi->dev, &irst_timeout_attr);
+ if (error)
+ goto out;
+
+ error = device_create_file(&acpi->dev, &irst_wakeup_attr);
+ if (error)
+ goto out_timeout;
+
+ return 0;
+
+out_timeout:
+ device_remove_file(&acpi->dev, &irst_timeout_attr);
+out:
+ return error;
+}
+
+static int irst_remove(struct acpi_device *acpi)
+{
+ device_remove_file(&acpi->dev, &irst_wakeup_attr);
+ device_remove_file(&acpi->dev, &irst_timeout_attr);
+
+ return 0;
+}
+
+static const struct acpi_device_id irst_ids[] = {
+ {"INT3392", 0},
+ {"", 0}
+};
+
+static struct acpi_driver irst_driver = {
+ .owner = THIS_MODULE,
+ .name = "intel_rapid_start",
+ .class = "intel_rapid_start",
+ .ids = irst_ids,
+ .ops = {
+ .add = irst_add,
+ .remove = irst_remove,
+ },
+};
+
+static int irst_init(void)
+{
+ return acpi_bus_register_driver(&irst_driver);
+}
+
+static void irst_exit(void)
+{
+ acpi_bus_unregister_driver(&irst_driver);
+}
+
+module_init(irst_init);
+module_exit(irst_exit);
+
+MODULE_DEVICE_TABLE(acpi, irst_ids);