From: Gavin Li <[email protected]>
This driver adds support for coarse (on or off) fan control and
the keyboard backlight on newer Samsung laptops.
---
drivers/platform/x86/Kconfig | 10 ++
drivers/platform/x86/Makefile | 1 +
drivers/platform/x86/samsung-wmi.c | 221 +++++++++++++++++++++++++++++++++++++
3 files changed, 232 insertions(+)
create mode 100644 drivers/platform/x86/samsung-wmi.c
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 9752761..96f4620 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -813,6 +813,16 @@ config SAMSUNG_LAPTOP
To compile this driver as a module, choose M here: the module
will be called samsung-laptop.
+config SAMSUNG_WMI
+ tristate "Samsung WMI driver (for newer Samsung laptops)"
+ depends on ACPI
+ depends on ACPI_WMI
+ select LEDS_CLASS
+ select NEW_LEDS
+ ---help---
+ This driver adds support for coarse (on or off) fan control
+ and the keyboard backlight for newer Samsung laptops.
+
config MXM_WMI
tristate "WMI support for MXM Laptop Graphics"
depends on ACPI_WMI
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index f82232b..4c65e51 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -48,6 +48,7 @@ obj-$(CONFIG_XO1_RFKILL) += xo1-rfkill.o
obj-$(CONFIG_XO15_EBOOK) += xo15-ebook.o
obj-$(CONFIG_IBM_RTL) += ibm_rtl.o
obj-$(CONFIG_SAMSUNG_LAPTOP) += samsung-laptop.o
+obj-$(CONFIG_SAMSUNG_WMI) += samsung-wmi.o
obj-$(CONFIG_MXM_WMI) += mxm-wmi.o
obj-$(CONFIG_INTEL_MID_POWER_BUTTON) += intel_mid_powerbtn.o
obj-$(CONFIG_INTEL_OAKTRAIL) += intel_oaktrail.o
diff --git a/drivers/platform/x86/samsung-wmi.c
b/drivers/platform/x86/samsung-wmi.c
new file mode 100644
index 0000000..c93cfe4
--- /dev/null
+++ b/drivers/platform/x86/samsung-wmi.c
@@ -0,0 +1,221 @@
+/*
+ * Samsung WMI driver
+ *
+ * Copyright (C) 2015 Gavin Li <[email protected]>
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/acpi.h>
+#include <linux/leds.h>
+#include <linux/platform_device.h>
+
+#define DRIVER_NAME "samsung-wmi"
+#define WMI_GUID "C16C47BA-50E3-444A-AF3A-B1C348380001"
+
+struct samsung_wmi_packet {
+ uint16_t magic;
+ uint16_t opcode;
+ uint8_t reqres;
+ uint8_t data[16];
+} __packed;
+
+static struct platform_device *samsung_wmi_device;
+
+static inline bool string_matches(const char *str, const char *kwd) {
+ size_t len = strlen(kwd);
+ if (strncmp(str, kwd, len) != 0)
+ return false;
+ return str[len] == '\0' || str[len] == '\n';
+}
+
+static int samsung_wmi_method_call(uint16_t opcode, void *data, size_t len) {
+ struct samsung_wmi_packet inpkt = {
+ .magic = 0x5843,
+ .opcode = opcode,
+ };
+ struct acpi_buffer inbuf = { sizeof(inpkt), &inpkt };
+ struct acpi_buffer outbuf = { ACPI_ALLOCATE_BUFFER, NULL };
+ union acpi_object *outobj;
+ struct samsung_wmi_packet *outpkt;
+ acpi_status st;
+ int ret = -EIO;
+ /********/
+ if (len > 16) {
+ ret = -EINVAL;
+ goto err0;
+ }
+ memcpy(inpkt.data, data, len);
+ st = wmi_evaluate_method(WMI_GUID, 1, 0, &inbuf, &outbuf);
+ if (ACPI_FAILURE(st)) {
+ dev_err(&samsung_wmi_device->dev, "opcode 0x%x failed: %s\n",
+ opcode, acpi_format_exception(st));
+ goto err0;
+ }
+ outobj = outbuf.pointer;
+ if (outobj->type != ACPI_TYPE_BUFFER) {
+ goto err1;
+ }
+ if (outobj->buffer.length < sizeof(outpkt)) {
+ goto err1;
+ }
+ outpkt = (struct samsung_wmi_packet *)outobj->buffer.pointer;
+ memcpy(data, outpkt->data, len);
+ ret = 0;
+err1:
+ kfree(outobj);
+err0:
+ return ret;
+}
+
+static int samsung_wmi_method_call_with_unlock(
+ uint16_t unlock_opcode,
+ uint16_t opcode, void *data, size_t len) {
+ unsigned int unlock_data = 0xAABB;
+ int ret;
+ /********/
+ ret = samsung_wmi_method_call(unlock_opcode, &unlock_data,
sizeof(unlock_data));
+ if (ret)
+ goto err0;
+ if (unlock_data != 0xCCDD) {
+ dev_err(&samsung_wmi_device->dev, "incorrect unlock
response!\n");
+ ret = -EIO;
+ goto err0;
+ }
+ ret = samsung_wmi_method_call(opcode, data, len);
+err0:
+ return ret;
+}
+
+static ssize_t samsung_wmi_fan_mode_show(struct device *dev, struct
device_attribute *attr,
+ char *buf) {
+ uint32_t data = 0;
+ if (samsung_wmi_method_call_with_unlock(0x31, 0x31, &data,
sizeof(data)))
+ return -EIO;
+ if (data)
+ strcpy(buf, "[auto off] on\n");
+ else
+ strcpy(buf, "auto off [on]\n");
+ return strlen(buf);
+}
+
+static ssize_t samsung_wmi_fan_mode_store(struct device *dev, struct
device_attribute *attr,
+ const char *buf, size_t count) {
+ uint32_t data;
+ if (string_matches(buf, "auto"))
+ data = 0x810001;
+ else if (string_matches(buf, "on"))
+ data = 0;
+ else if (string_matches(buf, "off"))
+ data = 0x800001;
+ else
+ return -EINVAL;
+ if (samsung_wmi_method_call_with_unlock(0x31, 0x32, &data,
sizeof(data)))
+ return -EIO;
+ else
+ return count;
+}
+
+static void samsung_wmi_kbd_backlight_led_brightness_set(
+ struct led_classdev *cdev, enum led_brightness brightness) {
+ unsigned int data = brightness;
+ if (data > 4)
+ data = 4;
+ data = (data << 8) | 0x82;
+ /********/
+ samsung_wmi_method_call_with_unlock(0x78, 0x78, &data, sizeof(data));
+}
+
+static DEVICE_ATTR(fan_mode, S_IRUGO | S_IWUSR, samsung_wmi_fan_mode_show,
samsung_wmi_fan_mode_store);
+
+static struct platform_driver samsung_wmi_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+static struct led_classdev samsung_wmi_kbd_backlight_led = {
+ .name = DRIVER_NAME "::kbd_backlight",
+ .max_brightness = 4,
+ .brightness_set = samsung_wmi_kbd_backlight_led_brightness_set,
+};
+
+static int kb_default_brightness = -1;
+module_param(kb_default_brightness, int, S_IRUGO);
+MODULE_PARM_DESC(kb_default_brightness,
+ "Default keyboard backlight brightness right after
initialization");
+
+static int samsung_wmi_init(void) {
+ int ret;
+ // check whether method is present
+ if (!wmi_has_guid(WMI_GUID))
+ return -ENODEV;
+ // we're good to go
+ ret = platform_driver_register(&samsung_wmi_driver);
+ if (ret) {
+ goto err0;
+ }
+ samsung_wmi_device = platform_device_alloc(DRIVER_NAME, -1);
+ if (!samsung_wmi_device) {
+ ret = -ENOMEM;
+ goto err1;
+ }
+ ret = platform_device_add(samsung_wmi_device);
+ if (ret) {
+ goto err2;
+ }
+ ret = device_create_file(&samsung_wmi_device->dev, &dev_attr_fan_mode);
+ if (ret) {
+ goto err3;
+ }
+ ret = led_classdev_register(&samsung_wmi_device->dev,
+ &samsung_wmi_kbd_backlight_led);
+ if (ret) {
+ goto err4;
+ }
+ if (kb_default_brightness >= 0) {
+ led_set_brightness(&samsung_wmi_kbd_backlight_led,
kb_default_brightness);
+ }
+ return 0;
+//err5:
+ led_classdev_unregister(&samsung_wmi_kbd_backlight_led);
+err4:
+ device_remove_file(&samsung_wmi_device->dev, &dev_attr_fan_mode);
+err3:
+ platform_device_del(samsung_wmi_device);
+err2:
+ platform_device_put(samsung_wmi_device);
+err1:
+ platform_driver_unregister(&samsung_wmi_driver);
+err0:
+ return ret;
+}
+
+static void samsung_wmi_exit(void) {
+ led_classdev_unregister(&samsung_wmi_kbd_backlight_led);
+ device_remove_file(&samsung_wmi_device->dev, &dev_attr_fan_mode);
+ platform_device_unregister(samsung_wmi_device);
+ platform_driver_unregister(&samsung_wmi_driver);
+}
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Gavin Li");
+MODULE_DESCRIPTION("WMI driver for some Samsung laptops.");
+MODULE_ALIAS("wmi:" WMI_GUID);
+module_init(samsung_wmi_init);
+module_exit(samsung_wmi_exit);
--
2.3.5
--
To unsubscribe from this list: send the line "unsubscribe platform-driver-x86"
in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
