platform/x86: intel-rst: Move to intel sub-directory

Move Intel RST driver to intel sub-directory to improve readability
and rename it from intel-rst.c to rst.c.

Signed-off-by: Kate Hsuan <hpa@redhat.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210820110458.73018-10-andriy.shevchenko@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

3 files changed, 158 insertions, 0 deletions

diff --git a/drivers/platform/x86/intel/Kconfig b/drivers/platform/x86/intel/Kconfig
index 379d9e425cc7..fb1d1175fd09 100644
--- a/drivers/platform/x86/intel/Kconfig
+++ b/drivers/platform/x86/intel/Kconfig
@@ -61,4 +61,16 @@ config INTEL_PUNIT_IPC
 	  This driver provides support for Intel P-Unit Mailbox IPC mechanism,
 	  which is used to bridge the communications between kernel and P-Unit.
 
+config INTEL_RST
+	tristate "Intel Rapid Start Technology Driver"
+	depends on ACPI
+	help
+	  This driver provides support for modifying parameters 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.
+
 endif # X86_PLATFORM_DRIVERS_INTEL
diff --git a/drivers/platform/x86/intel/Makefile b/drivers/platform/x86/intel/Makefile
index e8c2b1249f87..d0ab3202c1ac 100644
--- a/drivers/platform/x86/intel/Makefile
+++ b/drivers/platform/x86/intel/Makefile
@@ -20,3 +20,7 @@ intel_mrfld_pwrbtn-y			:= mrfld_pwrbtn.o
 obj-$(CONFIG_INTEL_MRFLD_PWRBTN)	+= intel_mrfld_pwrbtn.o
 intel_punit_ipc-y			:= punit_ipc.o
 obj-$(CONFIG_INTEL_PUNIT_IPC)		+= intel_punit_ipc.o
+
+# Intel Uncore drivers
+intel-rst-y				:= rst.o
+obj-$(CONFIG_INTEL_RST)			+= intel-rst.o
diff --git a/drivers/platform/x86/intel/rst.c b/drivers/platform/x86/intel/rst.c
new file mode 100644
index 000000000000..3b81cb896fed
--- /dev/null
+++ b/drivers/platform/x86/intel/rst.c
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  Copyright 2013 Matthew Garrett <mjg59@srcf.ucam.org>
+ */
+
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+MODULE_LICENSE("GPL");
+
+static ssize_t irst_show_wakeup_events(struct device *dev,
+				       struct device_attribute *attr,
+				       char *buf)
+{
+	struct acpi_device *acpi;
+	unsigned long long value;
+	acpi_status status;
+
+	acpi = to_acpi_device(dev);
+
+	status = acpi_evaluate_integer(acpi->handle, "GFFS", NULL, &value);
+	if (ACPI_FAILURE(status))
+		return -EINVAL;
+
+	return sprintf(buf, "%lld\n", 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;
+	acpi_status status;
+	unsigned long value;
+	int error;
+
+	acpi = to_acpi_device(dev);
+
+	error = kstrtoul(buf, 0, &value);
+	if (error)
+		return error;
+
+	status = acpi_execute_simple_method(acpi->handle, "SFFS", value);
+	if (ACPI_FAILURE(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;
+	unsigned long long value;
+	acpi_status status;
+
+	acpi = to_acpi_device(dev);
+
+	status = acpi_evaluate_integer(acpi->handle, "GFTV", NULL, &value);
+	if (ACPI_FAILURE(status))
+		return -EINVAL;
+
+	return sprintf(buf, "%lld\n", 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;
+	acpi_status status;
+	unsigned long value;
+	int error;
+
+	acpi = to_acpi_device(dev);
+
+	error = kstrtoul(buf, 0, &value);
+	if (error)
+		return error;
+
+	status = acpi_execute_simple_method(acpi->handle, "SFTV", value);
+	if (ACPI_FAILURE(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;
+
+	error = device_create_file(&acpi->dev, &irst_timeout_attr);
+	if (unlikely(error))
+		return error;
+
+	error = device_create_file(&acpi->dev, &irst_wakeup_attr);
+	if (unlikely(error))
+		device_remove_file(&acpi->dev, &irst_timeout_attr);
+
+	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,
+	},
+};
+
+module_acpi_driver(irst_driver);
+
+MODULE_DEVICE_TABLE(acpi, irst_ids);