| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <44b660c9-600a-4031-80ae-7a7e9465ffa9@gmx.de>
Date: Fri, 1 Mar 2024 11:09:15 +0100
From: Armin Wolf <W_Armin@....de>
To: Ai Chao <aichao@...inos.cn>, hdegoede@...hat.com,
ilpo.jarvinen@...ux.intel.com, linux-kernel@...r.kernel.org,
platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v3] platform/x86: add lenovo generic wmi driver
Am 01.03.24 um 09:16 schrieb Ai Chao:
> Add lenovo generic wmi driver to support camera button.
>
> Signed-off-by: Ai Chao <aichao@...inos.cn>
> ---
>
> v2: Adjust GPL v2 to GPL, adjust sprintf to sysfs_emit.
> v3: Remove lenovo_wmi_remove function.
>
> drivers/platform/x86/Kconfig | 10 +++
> drivers/platform/x86/Makefile | 1 +
> drivers/platform/x86/lenovo-wmi.c | 113 ++++++++++++++++++++++++++++++
> 3 files changed, 124 insertions(+)
> create mode 100644 drivers/platform/x86/lenovo-wmi.c
>
> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
> index bdd302274b9a..fbbb8fb843d7 100644
> --- a/drivers/platform/x86/Kconfig
> +++ b/drivers/platform/x86/Kconfig
> @@ -1001,6 +1001,16 @@ config INSPUR_PLATFORM_PROFILE
> To compile this driver as a module, choose M here: the module
> will be called inspur-platform-profile.
>
> +config LENOVO_WMI
> + tristate "Lenovo Geneirc WMI driver"
> + depends on ACPI_WMI
> + depends on INPUT
> + help
> + This driver provides support for Lenovo WMI driver.
> +
> + To compile this driver as a module, choose M here: the module
> + will be called lenovo-wmi.
> +
Hi,
does the WMI driver only handle the camera button? If yes, then please change the
driver name to something more specific like "lenovo-wmi-camera".
And please add a more descriptive help text.
> source "drivers/platform/x86/x86-android-tablets/Kconfig"
>
> config FW_ATTR_CLASS
> diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
> index 1de432e8861e..d51086552192 100644
> --- a/drivers/platform/x86/Makefile
> +++ b/drivers/platform/x86/Makefile
> @@ -66,6 +66,7 @@ obj-$(CONFIG_SENSORS_HDAPS) += hdaps.o
> obj-$(CONFIG_THINKPAD_ACPI) += thinkpad_acpi.o
> obj-$(CONFIG_THINKPAD_LMI) += think-lmi.o
> obj-$(CONFIG_YOGABOOK) += lenovo-yogabook.o
> +obj-$(CONFIG_LENOVO_WMI) += lenovo-wmi.o
>
> # Intel
> obj-y += intel/
> diff --git a/drivers/platform/x86/lenovo-wmi.c b/drivers/platform/x86/lenovo-wmi.c
> new file mode 100644
> index 000000000000..96c2ec9e6441
> --- /dev/null
> +++ b/drivers/platform/x86/lenovo-wmi.c
> @@ -0,0 +1,113 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Lenovo Generic WMI Driver
> + *
See note above.
> + * Copyright (C) 2024 Ai Chao <aichao@...inos.cn>
> + */
> +
> +#include <linux/acpi.h>
> +#include <linux/device.h>
> +#include <linux/input.h>
> +#include <linux/module.h>
> +#include <linux/wmi.h>
> +
> +#define WMI_LENOVO_CAMERABUTTON_EVENT_GUID "50C76F1F-D8E4-D895-0A3D-62F4EA400013"
> +
> +static u8 camera_mode;
Please avoid unnecessary global state, the WMI driver should be able to be instantiated
multiple times by the WMI driver core.
Instead move camera_mode into struct lenovo_wmi_priv.
> +
> +struct lenovo_wmi_priv {
> + struct input_dev *idev;
> +};
> +
> +static ssize_t camerabutton_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + return sysfs_emit(buf, "%u\n", camera_mode);
> +}
> +
> +DEVICE_ATTR_RO(camerabutton);
> +
> +static struct attribute *lenovo_wmi_attrs[] = {
> + &dev_attr_camerabutton.attr,
> + NULL,
> +};
> +
> +static const struct attribute_group lenovo_wmi_group = {
> + .attrs = lenovo_wmi_attrs,
> +};
> +
> +const struct attribute_group *lenovo_wmi_groups[] = {
> + &lenovo_wmi_group,
> + NULL,
> +};
> +
> +static void lenovo_wmi_notify(struct wmi_device *wdev, union acpi_object *obj)
> +{
> + struct lenovo_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
> +
> + if (obj->type == ACPI_TYPE_BUFFER) {
> + camera_mode = obj->buffer.pointer[0];
> + input_report_key(priv->idev, KEY_CAMERA, 1);
> + input_sync(priv->idev);
> + input_report_key(priv->idev, KEY_CAMERA, 0);
> + input_sync(priv->idev);
Two things:
- you should validate the size of the received ACPI buffer
- what data does camera_mode contain? Maybe it would make sense to
export camera_mode over the input subsystem _if_ it contains the current
state of the camera button (or something similar).
I think of a construct like this (assuming camera_mode contains the current state of the button):
input_report_key(priv->idev, KEY_CAMERA, camera_mode == CAMERA_BUTTON_PRESSED);
input_sync(priv->idev);
> + } else {
> + dev_dbg(&wdev->dev, "Bad response type %d\n", obj->type);
> + }
> +}
> +
> +static int lenovo_wmi_input_setup(struct wmi_device *wdev)
> +{
> + struct lenovo_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
> +
> + priv->idev = devm_input_allocate_device(&wdev->dev);
> + if (!priv->idev)
> + return -ENOMEM;
> +
> + priv->idev->name = "Lenovo WMI Camera Button";
> + priv->idev->phys = "wmi/input0";
> + priv->idev->id.bustype = BUS_HOST;
> + priv->idev->dev.parent = &wdev->dev;
> + priv->idev->evbit[0] = BIT_MASK(EV_KEY);
> + priv->idev->keybit[BIT_WORD(KEY_CAMERA)] = BIT_MASK(KEY_CAMERA);
> +
I thing set_bit() could be used here, like the xiaomi-wmi driver does it.
> + return input_register_device(priv->idev);
> +}
> +
> +static int lenovo_wmi_probe(struct wmi_device *wdev, const void *context)
> +{
> + struct lenovo_wmi_priv *priv;
> + int err;
> +
> + priv = devm_kzalloc(&wdev->dev, sizeof(struct lenovo_wmi_priv),
> + GFP_KERNEL);
Please use sizeof(*priv) instead of sizeof(struct lenovo_wmi_priv).
> + if (!priv)
> + return -ENOMEM;
> +
> + dev_set_drvdata(&wdev->dev, priv);
> +
> + err = lenovo_wmi_input_setup(wdev);
> + return err;
I think lenovo_wmi_input_setup() is small enough to merge it with lenovo_wmi_probe().
> +}
> +
> +static const struct wmi_device_id lenovo_wmi_id_table[] = {
> + { .guid_string = WMI_LENOVO_CAMERABUTTON_EVENT_GUID },
> + { }
> +};
> +
> +static struct wmi_driver lenovo_wmi_driver = {
> + .driver = {
> + .name = "lenovo-wmi",
> + .dev_groups = lenovo_wmi_groups,
> + },
> + .id_table = lenovo_wmi_id_table,
> + .probe = lenovo_wmi_probe,
> + .notify = lenovo_wmi_notify,
> +};
Please set probe_type = PROBE_PREFER_ASYNCHRONOUS like the inspur_platform_profile driver.
Also please set the no_singleton flag inside the WMI driver struct after you moved
camera_mode into struct lenovo_wmi_priv, as i wont accept new WMI drivers without
this flag.
Please note that the no_singleton flag was added very recently and you will need to rebase
your driver onto for-next.
Thanks,
Armin Wolf
> +
> +module_wmi_driver(lenovo_wmi_driver);
> +
> +MODULE_DEVICE_TABLE(wmi, lenovo_wmi_id_table);
> +MODULE_AUTHOR("Ai Chao <aichao@...inos.cn>");
> +MODULE_DESCRIPTION("Lenovo Generic WMI Driver");
> +MODULE_LICENSE("GPL");
Powered by blists - more mailing lists