a3d3c53f73
There is no need to initialize the error since it is going to be assigned with the return status of at least on of the device_create_file() call. We can return directly in case the first file creation fails. All the labels for goto can be removed (along with the gotos) as well. Tell the compiler that the failures are unlikely so it can create better binaries. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@gmail.com> Signed-off-by: Darren Hart <dvhart@linux.intel.com>
161 lines
3.7 KiB
C
161 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 <linux/acpi.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_FAILURE(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_FAILURE(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_FAILURE(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_FAILURE(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;
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error = device_create_file(&acpi->dev, &irst_timeout_attr);
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if (unlikely(error))
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return error;
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error = device_create_file(&acpi->dev, &irst_wakeup_attr);
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if (unlikely(error))
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device_remove_file(&acpi->dev, &irst_timeout_attr);
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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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