Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753933Ab3GBW2A (ORCPT ); Tue, 2 Jul 2013 18:28:00 -0400 Received: from cavan.codon.org.uk ([93.93.128.6]:44777 "EHLO cavan.codon.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752453Ab3GBW16 (ORCPT ); Tue, 2 Jul 2013 18:27:58 -0400 From: Matthew Garrett To: linux-kernel@vger.kernel.org Cc: platform-driver-x86@vger.kernel.org, Matthew Garrett Subject: [PATCH] Add support driver for Intel Rapid Start Technology Date: Tue, 2 Jul 2013 18:27:41 -0400 Message-Id: <1372804061-2260-1-git-send-email-mjg59@srcf.ucam.org> X-Mailer: git-send-email 1.8.3.1 X-SA-Do-Not-Run: Yes X-SA-Exim-Connect-IP: 2001:470:1f07:1371:422c:f4ff:fe92:dff9 X-SA-Exim-Mail-From: mjg59@srcf.ucam.org X-SA-Exim-Scanned: No (on cavan.codon.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7459 Lines: 270 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 --- .../ABI/testing/sysfs-driver-intel-rapid-start | 21 +++ drivers/platform/x86/intel-rst.c | 209 +++++++++++++++++++++ 2 files changed, 230 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-driver-intel-rapid-start create mode 100644 drivers/platform/x86/intel-rst.c diff --git a/Documentation/ABI/testing/sysfs-driver-intel-rapid-start b/Documentation/ABI/testing/sysfs-driver-intel-rapid-start new file mode 100644 index 0000000..5a7d2e2 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-driver-intel-rapid-start @@ -0,0 +1,21 @@ +What: /sys/bus/acpi/intel-rapid-start/wakeup_events +Date: July 2, 2013 +KernelVersion: 3.11 +Contact: Matthew Garrett +Description: An integer representing a set of wakeup events as follows: + 1: Wake to enter hibernation when the wakeup timer expires + 2: Wake to enter hibernation when the battery reaches a + critical level + + These values are ORed together. For example, a value of 3 + indicates that the system will wake to enter hibernation when + either the wakeup timer expires or the battery reaches a + critical level. + +What: /sys/bus/acpi/intel-rapid-start/wakeup_time +Date: July 2, 2013 +KernelVersion: 3.11 +Contact: Matthew Garrett +Description: An integer representing the length of time the system will + remain asleep before waking up to enter hibernation. + This value is in minutes. diff --git a/drivers/platform/x86/intel-rst.c b/drivers/platform/x86/intel-rst.c new file mode 100644 index 0000000..9385afd --- /dev/null +++ b/drivers/platform/x86/intel-rst.c @@ -0,0 +1,209 @@ +/* + * Copyright 2013 Matthew Garrett + * + * 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 +#include +#include +#include + +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 = ¶m; + + 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 = ¶m; + + 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); -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/