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c7c878a41d
acpi_evaluate_integer() is an ACPI API introduced to evaluate an ACPI control method that is known to have an integer return value. This API can simplify the code because the calling function does not need to use the specified acpi_buffer structure required by acpi_evaluate_object(); Convert acpi_evaluate_object() to acpi_evaluate_integer() in drivers/platform/x86/intel-rst.c in this patch. Plus, this should also fix a memory leak that the acpi_buffer is not freed in some cases. Signed-off-by: Zhang Rui <rui.zhang@intel.com> CC: Matthew Garrett <matthew.garrett@nebula.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
167 lines
3.7 KiB
C
167 lines
3.7 KiB
C
/*
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* Copyright 2013 Matthew Garrett <mjg59@srcf.ucam.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <acpi/acpi_drivers.h>
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MODULE_LICENSE("GPL");
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static ssize_t irst_show_wakeup_events(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct acpi_device *acpi;
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unsigned long long value;
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acpi_status status;
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acpi = to_acpi_device(dev);
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status = acpi_evaluate_integer(acpi->handle, "GFFS", NULL, &value);
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if (!ACPI_SUCCESS(status))
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return -EINVAL;
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return sprintf(buf, "%lld\n", value);
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}
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static ssize_t irst_store_wakeup_events(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct acpi_device *acpi;
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acpi_status status;
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unsigned long value;
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int error;
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acpi = to_acpi_device(dev);
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error = kstrtoul(buf, 0, &value);
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if (error)
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return error;
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status = acpi_execute_simple_method(acpi->handle, "SFFS", value);
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if (!ACPI_SUCCESS(status))
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return -EINVAL;
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return count;
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}
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static struct device_attribute irst_wakeup_attr = {
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.attr = { .name = "wakeup_events", .mode = 0600 },
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.show = irst_show_wakeup_events,
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.store = irst_store_wakeup_events
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};
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static ssize_t irst_show_wakeup_time(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct acpi_device *acpi;
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unsigned long long value;
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acpi_status status;
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acpi = to_acpi_device(dev);
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status = acpi_evaluate_integer(acpi->handle, "GFTV", NULL, &value);
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if (!ACPI_SUCCESS(status))
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return -EINVAL;
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return sprintf(buf, "%lld\n", value);
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}
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static ssize_t irst_store_wakeup_time(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct acpi_device *acpi;
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acpi_status status;
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unsigned long value;
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int error;
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acpi = to_acpi_device(dev);
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error = kstrtoul(buf, 0, &value);
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if (error)
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return error;
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status = acpi_execute_simple_method(acpi->handle, "SFTV", value);
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if (!ACPI_SUCCESS(status))
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return -EINVAL;
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return count;
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}
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static struct device_attribute irst_timeout_attr = {
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.attr = { .name = "wakeup_time", .mode = 0600 },
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.show = irst_show_wakeup_time,
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.store = irst_store_wakeup_time
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};
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static int irst_add(struct acpi_device *acpi)
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{
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int error = 0;
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error = device_create_file(&acpi->dev, &irst_timeout_attr);
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if (error)
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goto out;
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error = device_create_file(&acpi->dev, &irst_wakeup_attr);
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if (error)
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goto out_timeout;
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return 0;
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out_timeout:
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device_remove_file(&acpi->dev, &irst_timeout_attr);
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out:
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return error;
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}
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static int irst_remove(struct acpi_device *acpi)
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{
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device_remove_file(&acpi->dev, &irst_wakeup_attr);
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device_remove_file(&acpi->dev, &irst_timeout_attr);
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return 0;
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}
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static const struct acpi_device_id irst_ids[] = {
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{"INT3392", 0},
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{"", 0}
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};
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static struct acpi_driver irst_driver = {
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.owner = THIS_MODULE,
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.name = "intel_rapid_start",
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.class = "intel_rapid_start",
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.ids = irst_ids,
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.ops = {
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.add = irst_add,
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.remove = irst_remove,
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},
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};
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module_acpi_driver(irst_driver);
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MODULE_DEVICE_TABLE(acpi, irst_ids);
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