From: Mustafa Ekşi <mustafa.eskieksi@xxxxxxxxx>
This wmi driver supports Casper Excalibur laptops' changing keyboard
backlight, reading fan speeds and changing power profiles. Multicolor
led device is used for backlight, platform_profile for power management
and hwmon for fan speeds. It supports both old (10th gen or older) and
new (11th gen or newer) laptops. It uses x86_match_cpu to check if the
laptop is old or new.
This driver's Multicolor keyboard backlight API is very similar to Rishit
Bansal's proposed API.
Signed-off-by: Mustafa Ekşi <mustafa.eskieksi@xxxxxxxxx>
---
Changes in v4:
- Renamed casper_driver to casper_drv
- Moved all global variables to casper_drv struct. Devices access
casper_drv via wdev's driver_data.
- Removed struct led_cache, because only its u32 array was used. It is
replaced with color_cache.
- Added mutex_locks in casper_set and casper_query, so they now accept
casper_drv instead of wmi_device as argument.
- Changed endianess conversion in hwmon_read to something sparse doesn't
complain about.
- Moved registrations of multicolor leds and platform profile to their
own functions. This makes casper_wmi_probe more readable.
- Added .no_singleton to wmi_device.
- Some minor changes.
Changes in v3:
- Replaced led_control attribute with multicolor led interface.
- Added struct led_cache, instead of storing only last color change.
- Added dmi list to prevent registering platform_profile driver in models
that doesn't have this feature.
- Added a x86_cpu_id to differentiate older laptops that are reporting
fan speeds in big-endian. Also newer laptops have a different power
profile scheme. I'm using x86_cpu_id because they don't have a
difference in model names, only in cpu generations (the official driver
download page makes you select your cpu's generation too).
- Removed hwmon_pwm device in favor of platform_profile driver. It
indirectly affects fans' speed but they also affect frequency and
power consumption as well.
- Replaced handwritten masks with GENMASK equivalents.
- Replaced led_classdev_register with
devm_led_classdev_multicolor_register. This should solve the bug
where led_classdev remains registered even if casper_wmi_probe
returns -ENODEV.
- Removed select NEW_LEDS and LEDS_CLASS, because it creates recursive
dependencies.
- And some minor changes.
Changes in v2:
- Added masks for
- Changed casper_set and casper_query returns Linux error code rather
than acpi_status.
- replaced complicated bit operations with FIELD_GET.
- Fixed some indentation and spacing.
- Broke fan speeds further.
- Moved module metadata to the end of the file.
---
MAINTAINERS | 6 +
drivers/platform/x86/Kconfig | 14 +
drivers/platform/x86/Makefile | 1 +
drivers/platform/x86/casper-wmi.c | 629 ++++++++++++++++++++++++++++++
4 files changed, 650 insertions(+)
create mode 100644 drivers/platform/x86/casper-wmi.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 1aabf1c15bb..e4cb770c990 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4724,6 +4724,12 @@ S: Maintained
W: https://wireless.wiki.kernel.org/en/users/Drivers/carl9170
F: drivers/net/wireless/ath/carl9170/
+CASPER EXCALIBUR WMI DRIVER
+M: Mustafa Ekşi <mustafa.eskieksi@xxxxxxxxx>
+L: platform-driver-x86@xxxxxxxxxxxxxxx
+S: Maintained
+F: drivers/platform/x86/casper-wmi.c
+
CAVIUM I2C DRIVER
M: Robert Richter <rric@xxxxxxxxxx>
S: Odd Fixes
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index bdd302274b9..4f951bcac1a 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -1127,6 +1127,20 @@ config SEL3350_PLATFORM
To compile this driver as a module, choose M here: the module
will be called sel3350-platform.
+config CASPER_WMI
+ tristate "Casper Excalibur Laptop WMI driver"
+ depends on ACPI_WMI
+ depends on HWMON
+ depends on LEDS_CLASS_MULTICOLOR
+ select ACPI_PLATFORM_PROFILE
+ help
+ Say Y here if you want to support WMI-based fan speed reporting,
+ power management and keyboard backlight support on Casper Excalibur
+ Laptops.
+
+ To compile this driver as a module, choose M here: the module will
+ be called casper-wmi.
+
endif # X86_PLATFORM_DEVICES
config P2SB
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 1de432e8861..4b527dd44ad 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_MXM_WMI) += mxm-wmi.o
obj-$(CONFIG_NVIDIA_WMI_EC_BACKLIGHT) += nvidia-wmi-ec-backlight.o
obj-$(CONFIG_XIAOMI_WMI) += xiaomi-wmi.o
obj-$(CONFIG_GIGABYTE_WMI) += gigabyte-wmi.o
+obj-$(CONFIG_CASPER_WMI) += casper-wmi.o
# Acer
obj-$(CONFIG_ACERHDF) += acerhdf.o
diff --git a/drivers/platform/x86/casper-wmi.c b/drivers/platform/x86/casper-wmi.c
new file mode 100644
index 00000000000..72616c94860
--- /dev/null
+++ b/drivers/platform/x86/casper-wmi.c
@@ -0,0 +1,629 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include <linux/module.h>
+#include <linux/bits.h>
+#include <linux/bitops.h>
+#include <linux/acpi.h>
+#include <linux/leds.h>
+#include <linux/slab.h>
+#include <linux/wmi.h>
+#include <linux/device.h>
+#include <linux/hwmon.h>
+#include <linux/sysfs.h>
+#include <linux/types.h>
+#include <acpi/acexcep.h>
+#include <linux/bitfield.h>
+#include <linux/platform_profile.h>
+#include <linux/led-class-multicolor.h>
+#include <linux/types.h>
+#include <linux/mutex_types.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/container_of.h>
+
+#include <linux/dmi.h>
+#include <asm/cpu_device_id.h>
+#include <asm/intel-family.h>
+
+#define CASPER_WMI_GUID "644C5791-B7B0-4123-A90B-E93876E0DAAD"
+
+#define CASPER_READ 0xfa00
+#define CASPER_WRITE 0xfb00
+#define CASPER_GET_HARDWAREINFO 0x0200
+#define CASPER_SET_LED 0x0100
+#define CASPER_POWERPLAN 0x0300
+
+#define CASPER_KEYBOARD_LED_1 0x03
+#define CASPER_KEYBOARD_LED_2 0x04
+#define CASPER_KEYBOARD_LED_3 0x05
+#define CASPER_ALL_KEYBOARD_LEDS 0x06
+#define CASPER_CORNER_LEDS 0x07
+#define CASPER_LED_COUNT 4
+
+static const char * const zone_names[CASPER_LED_COUNT] = {
+ "casper::kbd_zoned_backlight-right",
+ "casper::kbd_zoned_backlight-middle",
+ "casper::kbd_zoned_backlight-left",
+ "casper::kbd_zoned_backlight-corners",
+};
+
+#define CASPER_LED_ALPHA GENMASK(31, 24)
+#define CASPER_LED_RED GENMASK(23, 16)
+#define CASPER_LED_GREEN GENMASK(15, 8)
+#define CASPER_LED_BLUE GENMASK(7, 0)
+#define CASPER_DEFAULT_COLOR (CASPER_LED_RED | CASPER_LED_GREEN | \
+ CASPER_LED_BLUE)
+#define CASPER_FAN_CPU 0
+#define CASPER_FAN_GPU 1
+
+enum casper_power_profile_old {
+ CASPER_HIGH_PERFORMANCE = 1,
+ CASPER_GAMING = 2,
+ CASPER_TEXT_MODE = 3,
+ CASPER_POWERSAVE = 4
+};
+
+enum casper_power_profile_new {
+ CASPER_NEW_HIGH_PERFORMANCE = 0,
+ CASPER_NEW_GAMING = 1,
+ CASPER_NEW_AUDIO = 2
+};
+
+struct casper_quirk_entry {
+ bool big_endian_fans;
+ bool no_power_profiles;
+ bool new_power_scheme;
+};
+
+struct casper_drv {
+ struct platform_profile_handler handler;
+ struct mutex casper_mutex;
+ u32 color_cache[CASPER_LED_COUNT];
+ struct led_classdev_mc *casper_kbd_mc;
+ struct mc_subled *subleds;
+ struct wmi_device *wdev;
+ struct casper_quirk_entry *quirk_applied;
+};
+
+struct casper_wmi_args {
+ u16 a0, a1;
+ u32 a2, a3, a4, a5, a6, a7, a8;
+};
+
+enum casper_led_mode {
+ LED_NORMAL = 0x10,
+ LED_BLINK = 0x20,
+ LED_FADE = 0x30,
+ LED_HEARTBEAT = 0x40,
+ LED_REPEAT = 0x50,
+ LED_RANDOM = 0x60
+};
+
+static int casper_set(struct casper_drv *drv, u16 a1, u8 led_id, u32 data)
+{
+ acpi_status ret = 0;
+ struct casper_wmi_args wmi_args;
+ struct acpi_buffer input;
+
+ wmi_args = (struct casper_wmi_args) {
+ .a0 = CASPER_WRITE,
+ .a1 = a1,
+ .a2 = led_id,
+ .a3 = data
+ };
+
+ input = (struct acpi_buffer) {
+ (acpi_size) sizeof(struct casper_wmi_args),
+ &wmi_args
+ };
+
+ mutex_lock(&drv->casper_mutex);
+
+ ret = wmidev_block_set(drv->wdev, 0, &input);
+ if (ACPI_FAILURE(ret))
+ ret = -EIO;
+
+ mutex_unlock(&drv->casper_mutex);
+ return ret;
+}
+
+static int casper_query(struct casper_drv *drv, u16 a1,
+ struct casper_wmi_args *out)
+{
+ union acpi_object *obj;
+ struct casper_wmi_args wmi_args;
+ struct acpi_buffer input;
+ int ret = 0;
+
+ wmi_args = (struct casper_wmi_args) {
+ .a0 = CASPER_READ,
+ .a1 = a1
+ };
+ input = (struct acpi_buffer) {
+ (acpi_size) sizeof(struct casper_wmi_args),
+ &wmi_args
+ };
+
+ mutex_lock(&drv->casper_mutex);
+
+ ret = wmidev_block_set(drv->wdev, 0, &input);
+ if (ACPI_FAILURE(ret)) {
+ ret = -EIO;
+ goto unlock;
+ }
+
+ obj = wmidev_block_query(drv->wdev, 0);
+ if (!obj) {
+ ret = -EIO;
+ goto unlock;
+ }
+
+ if (obj->type != ACPI_TYPE_BUFFER) { // obj will be 0x10 on failure
+ ret = -EINVAL;
+ goto freeobj;
+ }
+ if (obj->buffer.length != sizeof(struct casper_wmi_args)) {
+ ret = -EIO;
+ goto freeobj;
+ }
+
+ memcpy(out, obj->buffer.pointer, sizeof(struct casper_wmi_args));
+
+freeobj:
+ kfree(obj);
+unlock:
+ mutex_unlock(&drv->casper_mutex);
+ return ret;
+}
+
+static enum led_brightness get_casper_brightness(struct led_classdev *led_cdev)
+{
+ struct casper_drv *drv = dev_get_drvdata(led_cdev->dev->parent);
+ struct casper_wmi_args hardware_alpha = {0};
+
+ if (strcmp(led_cdev->name, zone_names[3]) == 0)
+ return FIELD_GET(CASPER_LED_ALPHA, drv->color_cache[3]);
+
+ casper_query(drv, CASPER_GET_HARDWAREINFO, &hardware_alpha);
+
+ return hardware_alpha.a6;
+}
+
+static void set_casper_brightness(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ u32 bright_with_mode, bright_prep, led_data, led_data_no_alpha;
+ struct casper_drv *drv;
+ int ret;
+ size_t zone;
+ u8 zone_to_change;
+
+ drv = dev_get_drvdata(led_cdev->dev->parent);
+
+ for (size_t i = 0; i < CASPER_LED_COUNT; i++)
+ if (strcmp(led_cdev->name, zone_names[i]) == 0)
+ zone = i;
+ if (zone == 3)
+ zone_to_change = CASPER_CORNER_LEDS;
+ else
+ zone_to_change = zone + CASPER_KEYBOARD_LED_1;
+
+ led_data_no_alpha = drv->subleds[zone].intensity & ~CASPER_LED_ALPHA;
+
+ if ((drv->color_cache[zone] & ~CASPER_LED_ALPHA) == led_data_no_alpha)
+ bright_with_mode = brightness | LED_NORMAL;
+ else
+ bright_with_mode = get_casper_brightness(led_cdev) | LED_NORMAL;
+
+ bright_prep = FIELD_PREP(CASPER_LED_ALPHA, bright_with_mode);
+ led_data = bright_prep | led_data_no_alpha;
+ ret = casper_set(drv, CASPER_SET_LED, zone_to_change, led_data);
+ if (ret)
+ return;
+
+ drv->color_cache[zone] = led_data;
+}
+
+static int casper_platform_profile_get(struct platform_profile_handler *pprof,
+ enum platform_profile_option *profile)
+{
+ struct casper_drv *drv = container_of(pprof, struct casper_drv,
+ handler);
+ struct casper_wmi_args ret_buff = {0};
+ int ret;
+
+ ret = casper_query(drv, CASPER_POWERPLAN, &ret_buff);
+ if (ret)
+ return ret;
+
+ if (drv->quirk_applied->new_power_scheme) {
+ switch (ret_buff.a2) {
+ case CASPER_NEW_HIGH_PERFORMANCE:
+ *profile = PLATFORM_PROFILE_PERFORMANCE;
+ break;
+ case CASPER_NEW_GAMING:
+ *profile = PLATFORM_PROFILE_BALANCED;
+ break;
+ case CASPER_NEW_AUDIO:
+ *profile = PLATFORM_PROFILE_LOW_POWER;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+ }
+
+ switch (ret_buff.a2) {
+ case CASPER_HIGH_PERFORMANCE:
+ *profile = PLATFORM_PROFILE_PERFORMANCE;
+ break;
+ case CASPER_GAMING:
+ *profile = PLATFORM_PROFILE_BALANCED_PERFORMANCE;
+ break;
+ case CASPER_TEXT_MODE:
+ *profile = PLATFORM_PROFILE_BALANCED;
+ break;
+ case CASPER_POWERSAVE:
+ *profile = PLATFORM_PROFILE_LOW_POWER;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int casper_platform_profile_set(struct platform_profile_handler *pprof,
+ enum platform_profile_option profile)
+{
+ struct casper_drv *drv = container_of(pprof, struct casper_drv,
+ handler);
+ enum casper_power_profile_old prf_old;
+ enum casper_power_profile_new prf_new;
+
+ if (drv->quirk_applied->new_power_scheme) {
+
+ switch (profile) {
+ case PLATFORM_PROFILE_PERFORMANCE:
+ prf_new = CASPER_NEW_HIGH_PERFORMANCE;
+ break;
+ case PLATFORM_PROFILE_BALANCED:
+ prf_new = CASPER_NEW_GAMING;
+ break;
+ case PLATFORM_PROFILE_LOW_POWER:
+ prf_new = CASPER_NEW_AUDIO;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return casper_set(drv, CASPER_POWERPLAN, prf_new, 0);
+ }
+
+ switch (profile) {
+ case PLATFORM_PROFILE_PERFORMANCE:
+ prf_old = CASPER_HIGH_PERFORMANCE;
+ break;
+ case PLATFORM_PROFILE_BALANCED_PERFORMANCE:
+ prf_old = CASPER_GAMING;
+ break;
+ case PLATFORM_PROFILE_BALANCED:
+ prf_old = CASPER_TEXT_MODE;
+ break;
+ case PLATFORM_PROFILE_LOW_POWER:
+ prf_old = CASPER_POWERSAVE;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return casper_set(drv, CASPER_POWERPLAN, prf_old, 0);
+}
+
+static umode_t casper_wmi_hwmon_is_visible(const void *drvdata,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel)
+{
+ return 0444;
+}
+
+static int casper_wmi_hwmon_read(struct device *dev,
+ enum hwmon_sensor_types type, u32 attr,
+ int channel, long *val)
+{
+ struct casper_wmi_args out = { 0 };
+ struct wmi_device *wdev = to_wmi_device(dev->parent);
+ struct casper_drv *drv = dev_get_drvdata(&wdev->dev);
+ int ret;
+
+ ret = casper_query(drv, CASPER_GET_HARDWAREINFO, &out);
+ if (ret)
+ return ret;
+
+ switch (channel) {
+ case CASPER_FAN_CPU:
+ if (drv->quirk_applied->big_endian_fans)
+ *val = be16_to_cpu(*(__be16 *)&out.a4);
+ else
+ *val = out.a5;
+ break;
+ case CASPER_FAN_GPU:
+ if (drv->quirk_applied->big_endian_fans)
+ *val = be16_to_cpu(*(__be16 *)&out.a5);
+ else
+ *val = out.a5;
+ break;
+ }
+
+ return 0;
+}
+
+static int casper_wmi_hwmon_read_string(struct device *dev,
+ enum hwmon_sensor_types type, u32 attr,
+ int channel, const char **str)
+{
+ switch (channel) {
+ case CASPER_FAN_CPU:
+ *str = "cpu_fan_speed";
+ break;
+ case CASPER_FAN_GPU:
+ *str = "gpu_fan_speed";
+ break;
+ }
+ return 0;
+}
+
+static const struct hwmon_ops casper_wmi_hwmon_ops = {
+ .is_visible = &casper_wmi_hwmon_is_visible,
+ .read = &casper_wmi_hwmon_read,
+ .read_string = &casper_wmi_hwmon_read_string,
+};
+
+static const struct hwmon_channel_info *const casper_wmi_hwmon_info[] = {
+ HWMON_CHANNEL_INFO(fan,
+ HWMON_F_INPUT | HWMON_F_LABEL,
+ HWMON_F_INPUT | HWMON_F_LABEL),
+ NULL
+};
+
+static const struct hwmon_chip_info casper_wmi_hwmon_chip_info = {
+ .ops = &casper_wmi_hwmon_ops,
+ .info = casper_wmi_hwmon_info,
+};
+
+static struct casper_quirk_entry gen_older_than_11 = {
+ .big_endian_fans = true,
+ .new_power_scheme = false
+};
+
+static struct casper_quirk_entry gen_newer_than_11 = {
+ .big_endian_fans = false,
+ .new_power_scheme = true
+};
+
+static const struct x86_cpu_id casper_gen[] = {
+ X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE, &gen_older_than_11),
+ X86_MATCH_INTEL_FAM6_MODEL(COMETLAKE, &gen_older_than_11),
+ X86_MATCH_INTEL_FAM6_MODEL(TIGERLAKE, &gen_newer_than_11),
+ X86_MATCH_INTEL_FAM6_MODEL(ALDERLAKE, &gen_newer_than_11),
+ X86_MATCH_INTEL_FAM6_MODEL(RAPTORLAKE, &gen_newer_than_11),
+ X86_MATCH_INTEL_FAM6_MODEL(METEORLAKE, &gen_newer_than_11),
+ {}
+};
+
+/*
+ * These quirks don't get stored in quirk_applied.
+ */
+static struct casper_quirk_entry quirk_no_power_profile = {
+ .no_power_profiles = true
+};
+
+static struct casper_quirk_entry quirk_has_power_profile = {
+ .no_power_profiles = false
+};
+
+static const struct dmi_system_id casper_quirks[] = {
+ {
+ .ident = "CASPER EXCALIBUR G650",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR,
+ "CASPER BILGISAYAR SISTEMLERI"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "EXCALIBUR G650")
+ },
+ .driver_data = &quirk_no_power_profile
+ },
+ {
+ .ident = "CASPER EXCALIBUR G670",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR,
+ "CASPER BILGISAYAR SISTEMLERI"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "EXCALIBUR G670")
+ },
+ .driver_data = &quirk_no_power_profile
+ },
+ {
+ .ident = "CASPER EXCALIBUR G750",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR,
+ "CASPER BILGISAYAR SISTEMLERI"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "EXCALIBUR G750")
+ },
+ .driver_data = &quirk_no_power_profile
+ },
+ {
+ .ident = "CASPER EXCALIBUR G770",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR,
+ "CASPER BILGISAYAR SISTEMLERI"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "EXCALIBUR G770")
+ },
+ .driver_data = &quirk_has_power_profile
+ },
+ {
+ .ident = "CASPER EXCALIBUR G780",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR,
+ "CASPER BILGISAYAR SISTEMLERI"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "EXCALIBUR G780")
+ },
+ .driver_data = &quirk_has_power_profile
+ },
+ {
+ .ident = "CASPER EXCALIBUR G870",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR,
+ "CASPER BILGISAYAR SISTEMLERI"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "EXCALIBUR G870")
+ },
+ .driver_data = &quirk_has_power_profile
+ },
+ {
+ .ident = "CASPER EXCALIBUR G900",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR,
+ "CASPER BILGISAYAR SISTEMLERI"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "EXCALIBUR G900")
+ },
+ .driver_data = &quirk_has_power_profile
+ },
+ {
+ .ident = "CASPER EXCALIBUR G911",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR,
+ "CASPER BILGISAYAR SISTEMLERI"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "EXCALIBUR G911")
+ },
+ .driver_data = &quirk_has_power_profile
+ },
+ { }
+};
+
+static int casper_platform_profile_register(struct casper_drv *drv)
+{
+ drv->handler.profile_get = casper_platform_profile_get;
+ drv->handler.profile_set = casper_platform_profile_set;
+
+ set_bit(PLATFORM_PROFILE_LOW_POWER, drv->handler.choices);
+ set_bit(PLATFORM_PROFILE_BALANCED, drv->handler.choices);
+ if (!drv->quirk_applied->new_power_scheme)
+ set_bit(PLATFORM_PROFILE_BALANCED_PERFORMANCE,
+ drv->handler.choices);
+ set_bit(PLATFORM_PROFILE_PERFORMANCE, drv->handler.choices);
+
+ return platform_profile_register(&drv->handler);
+}
+
+static int casper_multicolor_register(struct casper_drv *drv)
+{
+ int ret;
+
+ drv->casper_kbd_mc = devm_kcalloc(&drv->wdev->dev,
+ CASPER_LED_COUNT, sizeof(*drv->casper_kbd_mc), GFP_KERNEL);
+
+ drv->subleds = devm_kcalloc(&drv->wdev->dev,
+ CASPER_LED_COUNT, sizeof(struct mc_subled *), GFP_KERNEL);
+
+ for (size_t i = 0; i < CASPER_LED_COUNT; i++) {
+ drv->subleds[i] = (struct mc_subled) {
+ .color_index = LED_COLOR_ID_RGB,
+ .brightness = 2,
+ .intensity = CASPER_DEFAULT_COLOR
+ };
+ drv->casper_kbd_mc[i] = (struct led_classdev_mc) {
+ .led_cdev = {
+ .name = zone_names[i],
+ .brightness = 0,
+ .max_brightness = 2,
+ .brightness_set = &set_casper_brightness,
+ .brightness_get = &get_casper_brightness,
+ .color = LED_COLOR_ID_RGB,
+ },
+ .num_colors = 1,
+ .subled_info = &drv->subleds[i]
+ };
+
+ ret = devm_led_classdev_multicolor_register(&drv->wdev->dev,
+ &drv->casper_kbd_mc[i]);
+ if (ret)
+ return -ENODEV;
+ drv->color_cache[i] = CASPER_DEFAULT_COLOR;
+ }
+ return 0;
+}
+
+static int casper_wmi_probe(struct wmi_device *wdev, const void *context)
+{
+ struct device *hwmon_dev;
+ struct casper_drv *drv;
+ const struct x86_cpu_id *gen_id;
+ const struct dmi_system_id *dmi_id;
+ struct casper_quirk_entry *pp_quirk;
+ int ret;
+
+ drv = devm_kzalloc(&wdev->dev, sizeof(*drv), GFP_KERNEL);
+ if (!drv)
+ return -ENOMEM;
+ mutex_init(&drv->casper_mutex);
