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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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0d44b410a0
The kfree() function tests whether its argument is NULL and then returns immediately. Thus the test around the call is not needed. This issue was detected by using the Coccinelle software. Signed-off-by: Markus Elfring <elfring@users.sourceforge.net> Signed-off-by: Darren Hart <dvhart@linux.intel.com>
280 lines
6.5 KiB
C
280 lines
6.5 KiB
C
/*
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* HP Compaq TC1100 Tablet WMI Extras Driver
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*
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* Copyright (C) 2007 Carlos Corbacho <carlos@strangeworlds.co.uk>
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* Copyright (C) 2004 Jamey Hicks <jamey.hicks@hp.com>
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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 (at
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* 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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/acpi.h>
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#include <linux/platform_device.h>
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#define GUID "C364AC71-36DB-495A-8494-B439D472A505"
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#define TC1100_INSTANCE_WIRELESS 1
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#define TC1100_INSTANCE_JOGDIAL 2
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MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");
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MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");
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static struct platform_device *tc1100_device;
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struct tc1100_data {
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u32 wireless;
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u32 jogdial;
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};
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static struct tc1100_data suspend_data;
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/* --------------------------------------------------------------------------
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Device Management
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-------------------------------------------------------------------------- */
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static int get_state(u32 *out, u8 instance)
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{
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u32 tmp;
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acpi_status status;
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struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *obj;
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if (!out)
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return -EINVAL;
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if (instance > 2)
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return -ENODEV;
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status = wmi_query_block(GUID, instance, &result);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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obj = (union acpi_object *) result.pointer;
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if (obj && obj->type == ACPI_TYPE_INTEGER) {
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tmp = obj->integer.value;
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} else {
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tmp = 0;
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}
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if (result.length > 0)
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kfree(result.pointer);
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switch (instance) {
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case TC1100_INSTANCE_WIRELESS:
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*out = (tmp == 3) ? 1 : 0;
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return 0;
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case TC1100_INSTANCE_JOGDIAL:
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*out = (tmp == 1) ? 0 : 1;
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return 0;
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default:
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return -ENODEV;
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}
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}
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static int set_state(u32 *in, u8 instance)
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{
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u32 value;
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acpi_status status;
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struct acpi_buffer input;
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if (!in)
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return -EINVAL;
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if (instance > 2)
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return -ENODEV;
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switch (instance) {
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case TC1100_INSTANCE_WIRELESS:
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value = (*in) ? 1 : 2;
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break;
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case TC1100_INSTANCE_JOGDIAL:
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value = (*in) ? 0 : 1;
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break;
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default:
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return -ENODEV;
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}
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input.length = sizeof(u32);
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input.pointer = &value;
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status = wmi_set_block(GUID, instance, &input);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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return 0;
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}
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/* --------------------------------------------------------------------------
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FS Interface (/sys)
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-------------------------------------------------------------------------- */
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/*
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* Read/ write bool sysfs macro
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*/
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#define show_set_bool(value, instance) \
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static ssize_t \
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show_bool_##value(struct device *dev, struct device_attribute *attr, \
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char *buf) \
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{ \
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u32 result; \
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acpi_status status = get_state(&result, instance); \
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if (ACPI_SUCCESS(status)) \
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return sprintf(buf, "%d\n", result); \
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return sprintf(buf, "Read error\n"); \
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} \
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\
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static ssize_t \
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set_bool_##value(struct device *dev, struct device_attribute *attr, \
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const char *buf, size_t count) \
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{ \
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u32 tmp = simple_strtoul(buf, NULL, 10); \
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acpi_status status = set_state(&tmp, instance); \
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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 DEVICE_ATTR(value, S_IRUGO | S_IWUSR, \
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show_bool_##value, set_bool_##value);
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show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
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show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
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static struct attribute *tc1100_attributes[] = {
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&dev_attr_wireless.attr,
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&dev_attr_jogdial.attr,
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NULL
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};
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static struct attribute_group tc1100_attribute_group = {
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.attrs = tc1100_attributes,
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};
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/* --------------------------------------------------------------------------
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Driver Model
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-------------------------------------------------------------------------- */
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static int __init tc1100_probe(struct platform_device *device)
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{
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return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group);
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}
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static int tc1100_remove(struct platform_device *device)
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{
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sysfs_remove_group(&device->dev.kobj, &tc1100_attribute_group);
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return 0;
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}
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#ifdef CONFIG_PM
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static int tc1100_suspend(struct device *dev)
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{
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int ret;
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ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
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if (ret)
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return ret;
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ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
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if (ret)
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return ret;
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return 0;
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}
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static int tc1100_resume(struct device *dev)
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{
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int ret;
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ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
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if (ret)
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return ret;
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ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
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if (ret)
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return ret;
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return 0;
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}
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static const struct dev_pm_ops tc1100_pm_ops = {
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.suspend = tc1100_suspend,
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.resume = tc1100_resume,
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.freeze = tc1100_suspend,
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.restore = tc1100_resume,
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};
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#endif
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static struct platform_driver tc1100_driver = {
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.driver = {
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.name = "tc1100-wmi",
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#ifdef CONFIG_PM
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.pm = &tc1100_pm_ops,
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#endif
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},
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.remove = tc1100_remove,
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};
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static int __init tc1100_init(void)
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{
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int error;
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if (!wmi_has_guid(GUID))
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return -ENODEV;
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tc1100_device = platform_device_alloc("tc1100-wmi", -1);
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if (!tc1100_device)
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return -ENOMEM;
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error = platform_device_add(tc1100_device);
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if (error)
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goto err_device_put;
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error = platform_driver_probe(&tc1100_driver, tc1100_probe);
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if (error)
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goto err_device_del;
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pr_info("HP Compaq TC1100 Tablet WMI Extras loaded\n");
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return 0;
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err_device_del:
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platform_device_del(tc1100_device);
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err_device_put:
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platform_device_put(tc1100_device);
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return error;
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}
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static void __exit tc1100_exit(void)
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{
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platform_device_unregister(tc1100_device);
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platform_driver_unregister(&tc1100_driver);
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}
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module_init(tc1100_init);
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module_exit(tc1100_exit);
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