- 根目录:
- drivers
- platform
- x86
- alienware-wmi.c
/*
* Alienware AlienFX control
*
* Copyright (C) 2014 Dell Inc <mario_limonciello@dell.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.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/acpi.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/dmi.h>
#include <linux/acpi.h>
#include <linux/leds.h>
#define LEGACY_CONTROL_GUID "A90597CE-A997-11DA-B012-B622A1EF5492"
#define LEGACY_POWER_CONTROL_GUID "A80593CE-A997-11DA-B012-B622A1EF5492"
#define WMAX_CONTROL_GUID "A70591CE-A997-11DA-B012-B622A1EF5492"
#define WMAX_METHOD_HDMI_SOURCE 0x1
#define WMAX_METHOD_HDMI_STATUS 0x2
#define WMAX_METHOD_BRIGHTNESS 0x3
#define WMAX_METHOD_ZONE_CONTROL 0x4
#define WMAX_METHOD_HDMI_CABLE 0x5
MODULE_AUTHOR("Mario Limonciello <mario_limonciello@dell.com>");
MODULE_DESCRIPTION("Alienware special feature control");
MODULE_LICENSE("GPL");
MODULE_ALIAS("wmi:" LEGACY_CONTROL_GUID);
MODULE_ALIAS("wmi:" WMAX_CONTROL_GUID);
enum INTERFACE_FLAGS {
LEGACY,
WMAX,
};
enum LEGACY_CONTROL_STATES {
LEGACY_RUNNING = 1,
LEGACY_BOOTING = 0,
LEGACY_SUSPEND = 3,
};
enum WMAX_CONTROL_STATES {
WMAX_RUNNING = 0xFF,
WMAX_BOOTING = 0,
WMAX_SUSPEND = 3,
};
struct quirk_entry {
u8 num_zones;
u8 hdmi_mux;
};
static struct quirk_entry *quirks;
static struct quirk_entry quirk_unknown = {
.num_zones = 2,
.hdmi_mux = 0,
};
static struct quirk_entry quirk_x51_family = {
.num_zones = 3,
.hdmi_mux = 0.
};
static struct quirk_entry quirk_asm100 = {
.num_zones = 2,
.hdmi_mux = 1,
};
static int __init dmi_matched(const struct dmi_system_id *dmi)
{
quirks = dmi->driver_data;
return 1;
}
static const struct dmi_system_id alienware_quirks[] __initconst = {
{
.callback = dmi_matched,
.ident = "Alienware X51 R1",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Alienware"),
DMI_MATCH(DMI_PRODUCT_NAME, "Alienware X51"),
},
.driver_data = &quirk_x51_family,
},
{
.callback = dmi_matched,
.ident = "Alienware X51 R2",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Alienware"),
DMI_MATCH(DMI_PRODUCT_NAME, "Alienware X51 R2"),
},
.driver_data = &quirk_x51_family,
},
{
.callback = dmi_matched,
.ident = "Alienware ASM100",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Alienware"),
DMI_MATCH(DMI_PRODUCT_NAME, "ASM100"),
},
.driver_data = &quirk_asm100,
},
{}
};
struct color_platform {
u8 blue;
u8 green;
u8 red;
} __packed;
struct platform_zone {
u8 location;
struct device_attribute *attr;
struct color_platform colors;
};
struct wmax_brightness_args {
u32 led_mask;
u32 percentage;
};
struct hdmi_args {
u8 arg;
};
struct legacy_led_args {
struct color_platform colors;
u8 brightness;
u8 state;
} __packed;
struct wmax_led_args {
u32 led_mask;
struct color_platform colors;
u8 state;
} __packed;
static struct platform_device *platform_device;
static struct device_attribute *zone_dev_attrs;
static struct attribute **zone_attrs;
static struct platform_zone *zone_data;
static struct platform_driver platform_driver = {
.driver = {
.name = "alienware-wmi",
}
};
static struct attribute_group zone_attribute_group = {
.name = "rgb_zones",
};
static u8 interface;
static u8 lighting_control_state;
static u8 global_brightness;
/*
* Helpers used for zone control
*/
static int parse_rgb(const char *buf, struct platform_zone *zone)
{
long unsigned int rgb;
int ret;
union color_union {
struct color_platform cp;
int package;
} repackager;
ret = kstrtoul(buf, 16, &rgb);
if (ret)
return ret;
/* RGB triplet notation is 24-bit hexadecimal */
if (rgb > 0xFFFFFF)
return -EINVAL;
repackager.package = rgb & 0x0f0f0f0f;
pr_debug("alienware-wmi: r: %d g:%d b: %d\n",
repackager.cp.red, repackager.cp.green, repackager.cp.blue);
zone->colors = repackager.cp;
return 0;
}
static struct platform_zone *match_zone(struct device_attribute *attr)
{
int i;
for (i = 0; i < quirks->num_zones; i++) {
if ((struct device_attribute *)zone_data[i].attr == attr) {
pr_debug("alienware-wmi: matched zone location: %d\n",
zone_data[i].location);
return &zone_data[i];
}
}
return NULL;
}
/*
* Individual RGB zone control
*/
static int alienware_update_led(struct platform_zone *zone)
{
int method_id;
acpi_status status;
char *guid;
struct acpi_buffer input;
struct legacy_led_args legacy_args;
struct wmax_led_args wmax_args;
if (interface == WMAX) {
wmax_args.led_mask = 1 << zone->location;
wmax_args.colors = zone->colors;
wmax_args.state = lighting_control_state;
guid = WMAX_CONTROL_GUID;
method_id = WMAX_METHOD_ZONE_CONTROL;
input.length = (acpi_size) sizeof(wmax_args);
input.pointer = &wmax_args;
} else {
legacy_args.colors = zone->colors;
legacy_args.brightness = global_brightness;
legacy_args.state = 0;
if (lighting_control_state == LEGACY_BOOTING ||
lighting_control_state == LEGACY_SUSPEND) {
guid = LEGACY_POWER_CONTROL_GUID;
legacy_args.state = lighting_control_state;
} else
guid = LEGACY_CONTROL_GUID;
method_id = zone->location + 1;
input.length = (acpi_size) sizeof(legacy_args);
input.pointer = &legacy_args;
}
pr_debug("alienware-wmi: guid %s method %d\n", guid, method_id);
status = wmi_evaluate_method(guid, 1, method_id, &input, NULL);
if (ACPI_FAILURE(status))
pr_err("alienware-wmi: zone set failure: %u\n", status);
return ACPI_FAILURE(status);
}
static ssize_t zone_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct platform_zone *target_zone;
target_zone = match_zone(attr);
if (target_zone == NULL)
return sprintf(buf, "red: -1, green: -1, blue: -1\n");
return sprintf(buf, "red: %d, green: %d, blue: %d\n",
target_zone->colors.red,
target_zone->colors.green, target_zone->colors.blue);
}
static ssize_t zone_set(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct platform_zone *target_zone;
int ret;
target_zone = match_zone(attr);
if (target_zone == NULL) {
pr_err("alienware-wmi: invalid target zone\n");
return 1;
}
ret = parse_rgb(buf, target_zone);
if (ret)
return ret;
ret = alienware_update_led(target_zone);
return ret ? ret : count;
}
/*
* LED Brightness (Global)
*/
static int wmax_brightness(int brightness)
{
acpi_status status;
struct acpi_buffer input;
struct wmax_brightness_args args = {
.led_mask = 0xFF,
.percentage = brightness,
};
input.length = (acpi_size) sizeof(args);
input.pointer = &args;
status = wmi_evaluate_method(WMAX_CONTROL_GUID, 1,
WMAX_METHOD_BRIGHTNESS, &input, NULL);
if (ACPI_FAILURE(status))
pr_err("alienware-wmi: brightness set failure: %u\n", status);
return ACPI_FAILURE(status);
}
static void global_led_set(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
int ret;
global_brightness = brightness;
if (interface == WMAX)
ret = wmax_brightness(brightness);
else
ret = alienware_update_led(&zone_data[0]);
if (ret)
pr_err("LED brightness update failed\n");
}
static enum led_brightness global_led_get(struct led_classdev *led_cdev)
{
return global_brightness;
}
static struct led_classdev global_led = {
.brightness_set = global_led_set,
.brightness_get = global_led_get,
.name = "alienware::global_brightness",
};
/*
* Lighting control state device attribute (Global)
*/
static ssize_t show_control_state(struct device *dev,
struct device_attribute *attr, char *buf)
{
if (lighting_control_state == LEGACY_BOOTING)
return scnprintf(buf, PAGE_SIZE, "[booting] running suspend\n");
else if (lighting_control_state == LEGACY_SUSPEND)
return scnprintf(buf, PAGE_SIZE, "booting running [suspend]\n");
return scnprintf(buf, PAGE_SIZE, "booting [running] suspend\n");
}
static ssize_t store_control_state(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
long unsigned int val;
if (strcmp(buf, "booting\n") == 0)
val = LEGACY_BOOTING;
else if (strcmp(buf, "suspend\n") == 0)
val = LEGACY_SUSPEND;
else if (interface == LEGACY)
val = LEGACY_RUNNING;
else
val = WMAX_RUNNING;
lighting_control_state = val;
pr_debug("alienware-wmi: updated control state to %d\n",
lighting_control_state);
return count;
}
static DEVICE_ATTR(lighting_control_state, 0644, show_control_state,
store_control_state);
static int alienware_zone_init(struct platform_device *dev)
{
int i;
char buffer[10];
char *name;
if (interface == WMAX) {
lighting_control_state = WMAX_RUNNING;
} else if (interface == LEGACY) {
lighting_control_state = LEGACY_RUNNING;
}
global_led.max_brightness = 0x0F;
global_brightness = global_led.max_brightness;
/*
* - zone_dev_attrs num_zones + 1 is for individual zones and then
* null terminated
* - zone_attrs num_zones + 2 is for all attrs in zone_dev_attrs +
* the lighting control + null terminated
* - zone_data num_zones is for the distinct zones
*/
zone_dev_attrs =
kzalloc(sizeof(struct device_attribute) * (quirks->num_zones + 1),
GFP_KERNEL);
if (!zone_dev_attrs)
return -ENOMEM;
zone_attrs =
kzalloc(sizeof(struct attribute *) * (quirks->num_zones + 2),
GFP_KERNEL);
if (!zone_attrs)
return -ENOMEM;
zone_data =
kzalloc(sizeof(struct platform_zone) * (quirks->num_zones),
GFP_KERNEL);
if (!zone_data)
return -ENOMEM;
for (i = 0; i < quirks->num_zones; i++) {
sprintf(buffer, "zone%02X", i);
name = kstrdup(buffer, GFP_KERNEL);
if (name == NULL)
return 1;
sysfs_attr_init(&zone_dev_attrs[i].attr);
zone_dev_attrs[i].attr.name = name;
zone_dev_attrs[i].attr.mode = 0644;
zone_dev_attrs[i].show = zone_show;
zone_dev_attrs[i].store = zone_set;
zone_data[i].location = i;
zone_attrs[i] = &zone_dev_attrs[i].attr;
zone_data[i].attr = &zone_dev_attrs[i];
}
zone_attrs[quirks->num_zones] = &dev_attr_lighting_control_state.attr;
zone_attribute_group.attrs = zone_attrs;
led_classdev_register(&dev->dev, &global_led);
return sysfs_create_group(&dev->dev.kobj, &zone_attribute_group);
}
static void alienware_zone_exit(struct platform_device *dev)
{
sysfs_remove_group(&dev->dev.kobj, &zone_attribute_group);
led_classdev_unregister(&global_led);
if (zone_dev_attrs) {
int i;
for (i = 0; i < quirks->num_zones; i++)
kfree(zone_dev_attrs[i].attr.name);
}
kfree(zone_dev_attrs);
kfree(zone_data);
kfree(zone_attrs);
}
/*
The HDMI mux sysfs node indicates the status of the HDMI input mux.
It can toggle between standard system GPU output and HDMI input.
*/
static acpi_status alienware_hdmi_command(struct hdmi_args *in_args,
u32 command, int *out_data)
{
acpi_status status;
union acpi_object *obj;
struct acpi_buffer input;
struct acpi_buffer output;
input.length = (acpi_size) sizeof(*in_args);
input.pointer = in_args;
if (out_data != NULL) {
output.length = ACPI_ALLOCATE_BUFFER;
output.pointer = NULL;
status = wmi_evaluate_method(WMAX_CONTROL_GUID, 1,
command, &input, &output);
} else
status = wmi_evaluate_method(WMAX_CONTROL_GUID, 1,
command, &input, NULL);
if (ACPI_SUCCESS(status) && out_data != NULL) {
obj = (union acpi_object *)output.pointer;
if (obj && obj->type == ACPI_TYPE_INTEGER)
*out_data = (u32) obj->integer.value;
}
return status;
}
static ssize_t show_hdmi_cable(struct device *dev,
struct device_attribute *attr, char *buf)
{
acpi_status status;
u32 out_data;
struct hdmi_args in_args = {
.arg = 0,
};
status =
alienware_hdmi_command(&in_args, WMAX_METHOD_HDMI_CABLE,
(u32 *) &out_data);
if (ACPI_SUCCESS(status)) {
if (out_data == 0)
return scnprintf(buf, PAGE_SIZE,
"[unconnected] connected unknown\n");
else if (out_data == 1)
return scnprintf(buf, PAGE_SIZE,
"unconnected [connected] unknown\n");
}
pr_err("alienware-wmi: unknown HDMI cable status: %d\n", status);
return scnprintf(buf, PAGE_SIZE, "unconnected connected [unknown]\n");
}
static ssize_t show_hdmi_source(struct device *dev,
struct device_attribute *attr, char *buf)
{
acpi_status status;
u32 out_data;
struct hdmi_args in_args = {
.arg = 0,
};
status =
alienware_hdmi_command(&in_args, WMAX_METHOD_HDMI_STATUS,
(u32 *) &out_data);
if (ACPI_SUCCESS(status)) {
if (out_data == 1)
return scnprintf(buf, PAGE_SIZE,
"[input] gpu unknown\n");
else if (out_data == 2)
return scnprintf(buf, PAGE_SIZE,
"input [gpu] unknown\n");
}
pr_err("alienware-wmi: unknown HDMI source status: %d\n", out_data);
return scnprintf(buf, PAGE_SIZE, "input gpu [unknown]\n");
}
static ssize_t toggle_hdmi_source(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
acpi_status status;
struct hdmi_args args;
if (strcmp(buf, "gpu\n") == 0)
args.arg = 1;
else if (strcmp(buf, "input\n") == 0)
args.arg = 2;
else
args.arg = 3;
pr_debug("alienware-wmi: setting hdmi to %d : %s", args.arg, buf);
status = alienware_hdmi_command(&args, WMAX_METHOD_HDMI_SOURCE, NULL);
if (ACPI_FAILURE(status))
pr_err("alienware-wmi: HDMI toggle failed: results: %u\n",
status);
return count;
}
static DEVICE_ATTR(cable, S_IRUGO, show_hdmi_cable, NULL);
static DEVICE_ATTR(source, S_IRUGO | S_IWUSR, show_hdmi_source,
toggle_hdmi_source);
static struct attribute *hdmi_attrs[] = {
&dev_attr_cable.attr,
&dev_attr_source.attr,
NULL,
};
static struct attribute_group hdmi_attribute_group = {
.name = "hdmi",
.attrs = hdmi_attrs,
};
static void remove_hdmi(struct platform_device *dev)
{
if (quirks->hdmi_mux > 0)
sysfs_remove_group(&dev->dev.kobj, &hdmi_attribute_group);
}
static int create_hdmi(struct platform_device *dev)
{
int ret;
ret = sysfs_create_group(&dev->dev.kobj, &hdmi_attribute_group);
if (ret)
goto error_create_hdmi;
return 0;
error_create_hdmi:
remove_hdmi(dev);
return ret;
}
static int __init alienware_wmi_init(void)
{
int ret;
if (wmi_has_guid(LEGACY_CONTROL_GUID))
interface = LEGACY;
else if (wmi_has_guid(WMAX_CONTROL_GUID))
interface = WMAX;
else {
pr_warn("alienware-wmi: No known WMI GUID found\n");
return -ENODEV;
}
dmi_check_system(alienware_quirks);
if (quirks == NULL)
quirks = &quirk_unknown;
ret = platform_driver_register(&platform_driver);
if (ret)
goto fail_platform_driver;
platform_device = platform_device_alloc("alienware-wmi", -1);
if (!platform_device) {
ret = -ENOMEM;
goto fail_platform_device1;
}
ret = platform_device_add(platform_device);
if (ret)
goto fail_platform_device2;
if (quirks->hdmi_mux > 0) {
ret = create_hdmi(platform_device);
if (ret)
goto fail_prep_hdmi;
}
ret = alienware_zone_init(platform_device);
if (ret)
goto fail_prep_zones;
return 0;
fail_prep_zones:
alienware_zone_exit(platform_device);
fail_prep_hdmi:
platform_device_del(platform_device);
fail_platform_device2:
platform_device_put(platform_device);
fail_platform_device1:
platform_driver_unregister(&platform_driver);
fail_platform_driver:
return ret;
}
module_init(alienware_wmi_init);
static void __exit alienware_wmi_exit(void)
{
if (platform_device) {
alienware_zone_exit(platform_device);
remove_hdmi(platform_device);
platform_device_unregister(platform_device);
platform_driver_unregister(&platform_driver);
}
}
module_exit(alienware_wmi_exit);