On Tue, Apr 7, 2015 at 6:53 PM, <gavinli@xxxxxxxxxxxxxx> wrote:
> From: Gavin Li <git@xxxxxxxxxxxxxx>
>
> 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 <git@xxxxxxxxxxxxxx>
> + *
> + * 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,
Please use a constant instead of a magic number here.
> + .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) {
Please use a constant instead of 16 here.
> + 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;
Same
> + 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;
Same, and other places
> + 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;
Why sometime uint32_t and sometime unsigned int ?
> + 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:
Instead of 'errX' please give a name related to what happen after the
label (or what failed just before)
> + 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
>
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--
Corentin Chary
http://xf.iksaif.net
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