android_kernel_xiaomi_sm8350/drivers/platform/x86/msi-wmi.c

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/*
* MSI WMI hotkeys
*
* Copyright (C) 2009 Novell <trenn@suse.de>
*
* Most stuff taken over from hp-wmi
*
* 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/input.h>
#include <linux/input/sparse-keymap.h>
#include <linux/acpi.h>
#include <linux/backlight.h>
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>
2010-03-24 04:04:11 -04:00
#include <linux/slab.h>
MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
MODULE_DESCRIPTION("MSI laptop WMI hotkeys driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("wmi:551A1F84-FBDD-4125-91DB-3EA8F44F1D45");
MODULE_ALIAS("wmi:B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2");
#define DRV_NAME "msi-wmi"
#define DRV_PFX DRV_NAME ": "
#define MSIWMI_BIOS_GUID "551A1F84-FBDD-4125-91DB-3EA8F44F1D45"
#define MSIWMI_EVENT_GUID "B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2"
#define dprintk(msg...) pr_debug(DRV_PFX msg)
#define KEYCODE_BASE 0xD0
#define MSI_WMI_BRIGHTNESSUP KEYCODE_BASE
#define MSI_WMI_BRIGHTNESSDOWN (KEYCODE_BASE + 1)
#define MSI_WMI_VOLUMEUP (KEYCODE_BASE + 2)
#define MSI_WMI_VOLUMEDOWN (KEYCODE_BASE + 3)
static struct key_entry msi_wmi_keymap[] = {
{ KE_KEY, MSI_WMI_BRIGHTNESSUP, {KEY_BRIGHTNESSUP} },
{ KE_KEY, MSI_WMI_BRIGHTNESSDOWN, {KEY_BRIGHTNESSDOWN} },
{ KE_KEY, MSI_WMI_VOLUMEUP, {KEY_VOLUMEUP} },
{ KE_KEY, MSI_WMI_VOLUMEDOWN, {KEY_VOLUMEDOWN} },
{ KE_END, 0}
};
static ktime_t last_pressed[ARRAY_SIZE(msi_wmi_keymap) - 1];
struct backlight_device *backlight;
static int backlight_map[] = { 0x00, 0x33, 0x66, 0x99, 0xCC, 0xFF };
static struct input_dev *msi_wmi_input_dev;
static int msi_wmi_query_block(int instance, int *ret)
{
acpi_status status;
union acpi_object *obj;
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
status = wmi_query_block(MSIWMI_BIOS_GUID, instance, &output);
obj = output.pointer;
if (!obj || obj->type != ACPI_TYPE_INTEGER) {
if (obj) {
printk(KERN_ERR DRV_PFX "query block returned object "
"type: %d - buffer length:%d\n", obj->type,
obj->type == ACPI_TYPE_BUFFER ?
obj->buffer.length : 0);
}
kfree(obj);
return -EINVAL;
}
*ret = obj->integer.value;
kfree(obj);
return 0;
}
static int msi_wmi_set_block(int instance, int value)
{
acpi_status status;
struct acpi_buffer input = { sizeof(int), &value };
dprintk("Going to set block of instance: %d - value: %d\n",
instance, value);
status = wmi_set_block(MSIWMI_BIOS_GUID, instance, &input);
return ACPI_SUCCESS(status) ? 0 : 1;
}
static int bl_get(struct backlight_device *bd)
{
int level, err, ret;
/* Instance 1 is "get backlight", cmp with DSDT */
err = msi_wmi_query_block(1, &ret);
if (err) {
printk(KERN_ERR DRV_PFX "Could not query backlight: %d\n", err);
return -EINVAL;
}
dprintk("Get: Query block returned: %d\n", ret);
for (level = 0; level < ARRAY_SIZE(backlight_map); level++) {
if (backlight_map[level] == ret) {
dprintk("Current backlight level: 0x%X - index: %d\n",
backlight_map[level], level);
break;
}
}
if (level == ARRAY_SIZE(backlight_map)) {
printk(KERN_ERR DRV_PFX "get: Invalid brightness value: 0x%X\n",
ret);
return -EINVAL;
}
return level;
}
static int bl_set_status(struct backlight_device *bd)
{
int bright = bd->props.brightness;
if (bright >= ARRAY_SIZE(backlight_map) || bright < 0)
return -EINVAL;
/* Instance 0 is "set backlight" */
return msi_wmi_set_block(0, backlight_map[bright]);
}
static const struct backlight_ops msi_backlight_ops = {
.get_brightness = bl_get,
.update_status = bl_set_status,
};
static void msi_wmi_notify(u32 value, void *context)
{
struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
static struct key_entry *key;
union acpi_object *obj;
ktime_t cur;
acpi_status status;
status = wmi_get_event_data(value, &response);
if (status != AE_OK) {
printk(KERN_INFO DRV_PFX "bad event status 0x%x\n", status);
return;
}
obj = (union acpi_object *)response.pointer;
if (obj && obj->type == ACPI_TYPE_INTEGER) {
int eventcode = obj->integer.value;
dprintk("Eventcode: 0x%x\n", eventcode);
key = sparse_keymap_entry_from_scancode(msi_wmi_input_dev,
eventcode);
if (key) {
ktime_t diff;
cur = ktime_get_real();
diff = ktime_sub(cur, last_pressed[key->code -
KEYCODE_BASE]);
/* Ignore event if the same event happened in a 50 ms
timeframe -> Key press may result in 10-20 GPEs */
if (ktime_to_us(diff) < 1000 * 50) {
dprintk("Suppressed key event 0x%X - "
"Last press was %lld us ago\n",
key->code, ktime_to_us(diff));
return;
}
last_pressed[key->code - KEYCODE_BASE] = cur;
if (key->type == KE_KEY &&
/* Brightness is served via acpi video driver */
(!acpi_video_backlight_support() ||
(key->code != MSI_WMI_BRIGHTNESSUP &&
key->code != MSI_WMI_BRIGHTNESSDOWN))) {
dprintk("Send key: 0x%X - "
"Input layer keycode: %d\n", key->code,
key->keycode);
sparse_keymap_report_entry(msi_wmi_input_dev,
key, 1, true);
}
} else
printk(KERN_INFO "Unknown key pressed - %x\n",
eventcode);
} else
printk(KERN_INFO DRV_PFX "Unknown event received\n");
kfree(response.pointer);
}
static int __init msi_wmi_input_setup(void)
{
int err;
msi_wmi_input_dev = input_allocate_device();
if (!msi_wmi_input_dev)
return -ENOMEM;
msi_wmi_input_dev->name = "MSI WMI hotkeys";
msi_wmi_input_dev->phys = "wmi/input0";
msi_wmi_input_dev->id.bustype = BUS_HOST;
err = sparse_keymap_setup(msi_wmi_input_dev, msi_wmi_keymap, NULL);
if (err)
goto err_free_dev;
err = input_register_device(msi_wmi_input_dev);
if (err)
goto err_free_keymap;
memset(last_pressed, 0, sizeof(last_pressed));
return 0;
err_free_keymap:
sparse_keymap_free(msi_wmi_input_dev);
err_free_dev:
input_free_device(msi_wmi_input_dev);
return err;
}
static int __init msi_wmi_init(void)
{
int err;
if (!wmi_has_guid(MSIWMI_EVENT_GUID)) {
printk(KERN_ERR
"This machine doesn't have MSI-hotkeys through WMI\n");
return -ENODEV;
}
err = wmi_install_notify_handler(MSIWMI_EVENT_GUID,
msi_wmi_notify, NULL);
if (ACPI_FAILURE(err))
return -EINVAL;
err = msi_wmi_input_setup();
if (err)
goto err_uninstall_notifier;
if (!acpi_video_backlight_support()) {
struct backlight_properties props;
memset(&props, 0, sizeof(struct backlight_properties));
props.max_brightness = ARRAY_SIZE(backlight_map) - 1;
backlight = backlight_device_register(DRV_NAME, NULL, NULL,
&msi_backlight_ops,
&props);
if (IS_ERR(backlight)) {
err = PTR_ERR(backlight);
goto err_free_input;
}
err = bl_get(NULL);
if (err < 0)
goto err_free_backlight;
backlight->props.brightness = err;
}
dprintk("Event handler installed\n");
return 0;
err_free_backlight:
backlight_device_unregister(backlight);
err_free_input:
input_unregister_device(msi_wmi_input_dev);
err_uninstall_notifier:
wmi_remove_notify_handler(MSIWMI_EVENT_GUID);
return err;
}
static void __exit msi_wmi_exit(void)
{
if (wmi_has_guid(MSIWMI_EVENT_GUID)) {
wmi_remove_notify_handler(MSIWMI_EVENT_GUID);
sparse_keymap_free(msi_wmi_input_dev);
input_unregister_device(msi_wmi_input_dev);
backlight_device_unregister(backlight);
}
}
module_init(msi_wmi_init);
module_exit(msi_wmi_exit);