linux/drivers/platform/x86/tc1100-wmi.c
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00

285 lines
6.7 KiB
C

/*
* HP Compaq TC1100 Tablet WMI Extras Driver
*
* Copyright (C) 2007 Carlos Corbacho <carlos@strangeworlds.co.uk>
* Copyright (C) 2004 Jamey Hicks <jamey.hicks@hp.com>
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* 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.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/types.h>
#include <acpi/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <linux/platform_device.h>
#define GUID "C364AC71-36DB-495A-8494-B439D472A505"
#define TC1100_INSTANCE_WIRELESS 1
#define TC1100_INSTANCE_JOGDIAL 2
#define TC1100_LOGPREFIX "tc1100-wmi: "
#define TC1100_INFO KERN_INFO TC1100_LOGPREFIX
MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");
MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
MODULE_LICENSE("GPL");
MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");
static struct platform_device *tc1100_device;
struct tc1100_data {
u32 wireless;
u32 jogdial;
};
static struct tc1100_data suspend_data;
/* --------------------------------------------------------------------------
Device Management
-------------------------------------------------------------------------- */
static int get_state(u32 *out, u8 instance)
{
u32 tmp;
acpi_status status;
struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
if (!out)
return -EINVAL;
if (instance > 2)
return -ENODEV;
status = wmi_query_block(GUID, instance, &result);
if (ACPI_FAILURE(status))
return -ENODEV;
obj = (union acpi_object *) result.pointer;
if (obj && obj->type == ACPI_TYPE_INTEGER) {
tmp = obj->integer.value;
} else {
tmp = 0;
}
if (result.length > 0 && result.pointer)
kfree(result.pointer);
switch (instance) {
case TC1100_INSTANCE_WIRELESS:
*out = (tmp == 3) ? 1 : 0;
return 0;
case TC1100_INSTANCE_JOGDIAL:
*out = (tmp == 1) ? 0 : 1;
return 0;
default:
return -ENODEV;
}
}
static int set_state(u32 *in, u8 instance)
{
u32 value;
acpi_status status;
struct acpi_buffer input;
if (!in)
return -EINVAL;
if (instance > 2)
return -ENODEV;
switch (instance) {
case TC1100_INSTANCE_WIRELESS:
value = (*in) ? 1 : 2;
break;
case TC1100_INSTANCE_JOGDIAL:
value = (*in) ? 0 : 1;
break;
default:
return -ENODEV;
}
input.length = sizeof(u32);
input.pointer = &value;
status = wmi_set_block(GUID, instance, &input);
if (ACPI_FAILURE(status))
return -ENODEV;
return 0;
}
/* --------------------------------------------------------------------------
FS Interface (/sys)
-------------------------------------------------------------------------- */
/*
* Read/ write bool sysfs macro
*/
#define show_set_bool(value, instance) \
static ssize_t \
show_bool_##value(struct device *dev, struct device_attribute *attr, \
char *buf) \
{ \
u32 result; \
acpi_status status = get_state(&result, instance); \
if (ACPI_SUCCESS(status)) \
return sprintf(buf, "%d\n", result); \
return sprintf(buf, "Read error\n"); \
} \
\
static ssize_t \
set_bool_##value(struct device *dev, struct device_attribute *attr, \
const char *buf, size_t count) \
{ \
u32 tmp = simple_strtoul(buf, NULL, 10); \
acpi_status status = set_state(&tmp, instance); \
if (ACPI_FAILURE(status)) \
return -EINVAL; \
return count; \
} \
static DEVICE_ATTR(value, S_IWUGO | S_IRUGO | S_IWUSR, \
show_bool_##value, set_bool_##value);
show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
static struct attribute *tc1100_attributes[] = {
&dev_attr_wireless.attr,
&dev_attr_jogdial.attr,
NULL
};
static struct attribute_group tc1100_attribute_group = {
.attrs = tc1100_attributes,
};
/* --------------------------------------------------------------------------
Driver Model
-------------------------------------------------------------------------- */
static int __init tc1100_probe(struct platform_device *device)
{
return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group);
}
static int __devexit tc1100_remove(struct platform_device *device)
{
sysfs_remove_group(&device->dev.kobj, &tc1100_attribute_group);
return 0;
}
#ifdef CONFIG_PM
static int tc1100_suspend(struct device *dev)
{
int ret;
ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
if (ret)
return ret;
ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
if (ret)
return ret;
return 0;
}
static int tc1100_resume(struct device *dev)
{
int ret;
ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
if (ret)
return ret;
ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
if (ret)
return ret;
return 0;
}
static const struct dev_pm_ops tc1100_pm_ops = {
.suspend = tc1100_suspend,
.resume = tc1100_resume,
.freeze = tc1100_suspend,
.restore = tc1100_resume,
};
#endif
static struct platform_driver tc1100_driver = {
.driver = {
.name = "tc1100-wmi",
.owner = THIS_MODULE,
#ifdef CONFIG_PM
.pm = &tc1100_pm_ops,
#endif
},
.remove = __devexit_p(tc1100_remove),
};
static int __init tc1100_init(void)
{
int error;
if (!wmi_has_guid(GUID))
return -ENODEV;
tc1100_device = platform_device_alloc("tc1100-wmi", -1);
if (!tc1100_device)
return -ENOMEM;
error = platform_device_add(tc1100_device);
if (error)
goto err_device_put;
error = platform_driver_probe(&tc1100_driver, tc1100_probe);
if (error)
goto err_device_del;
printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras loaded\n");
return 0;
err_device_del:
platform_device_del(tc1100_device);
err_device_put:
platform_device_put(tc1100_device);
return error;
}
static void __exit tc1100_exit(void)
{
platform_device_unregister(tc1100_device);
platform_driver_unregister(&tc1100_driver);
}
module_init(tc1100_init);
module_exit(tc1100_exit);