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Message-ID: <d5dce9f8-ae80-44c7-a45e-9b763de88095@gmx.de>
Date: Wed, 18 Oct 2023 14:23:21 +0200
From: Armin Wolf <W_Armin@....de>
To: Ai Chao <aichao@...inos.cn>, hdegoede@...hat.com,
ilpo.jarvinen@...ux.intel.com, markgross@...nel.org
Cc: linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v3] platform/x86: inspur-wmi: Add platform profile support
Am 18.10.23 um 10:00 schrieb Ai Chao:
> Add support for Inspur platforms to used the platform profile feature.
>
> This will allow users to determine and control the platform modes
> between low-power, balanced and performance modes.
>
> change for v3
> - Remove input device
> - Using the platform profile interface
>
> change for v2
> - Remove Event GUID, remove inspur_wmi_notify and inspur_wmi_notify.
> - Add more explanation.
Please move the changelog out of the commit message, see
https://lore.kernel.org/lkml/20231007081230.3555681-1-andriy.shevchenko@linux.intel.com
for an example.
> Signed-off-by: Ai Chao <aichao@...inos.cn>
> ---
> drivers/platform/x86/Kconfig | 10 ++
> drivers/platform/x86/Makefile | 3 +
> drivers/platform/x86/inspur-wmi.c | 215 ++++++++++++++++++++++++++++++
> 3 files changed, 228 insertions(+)
> create mode 100644 drivers/platform/x86/inspur-wmi.c
>
> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
> index 2a1070543391..d7bd27c53751 100644
> --- a/drivers/platform/x86/Kconfig
> +++ b/drivers/platform/x86/Kconfig
> @@ -988,6 +988,16 @@ config TOUCHSCREEN_DMI
> the OS-image for the device. This option supplies the missing info.
> Enable this for x86 tablets with Silead or Chipone touchscreens.
>
> +config INSPUR_WMI
> + tristate "Inspur WMI platform profile driver"
> + depends on ACPI_WMI
Please select the platform profile subsystem with "select ACPI_PLATFORM_PROFILE".
> + help
> + This will allow users to determine and control the platform modes
> + between low-power, balanced and performance modes.
> +
> + To compile this driver as a module, choose M here: the module
> + will be called inspur-wmi.
> +
> 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 b457de5abf7d..9285c252757e 100644
> --- a/drivers/platform/x86/Makefile
> +++ b/drivers/platform/x86/Makefile
> @@ -98,6 +98,9 @@ obj-$(CONFIG_TOSHIBA_WMI) += toshiba-wmi.o
> # before toshiba_acpi initializes
> obj-$(CONFIG_ACPI_TOSHIBA) += toshiba_acpi.o
>
> +# Inspur
> +obj-$(CONFIG_INSPUR_WMI) += inspur-wmi.o
> +
> # Laptop drivers
> obj-$(CONFIG_ACPI_CMPC) += classmate-laptop.o
> obj-$(CONFIG_COMPAL_LAPTOP) += compal-laptop.o
> diff --git a/drivers/platform/x86/inspur-wmi.c b/drivers/platform/x86/inspur-wmi.c
> new file mode 100644
> index 000000000000..d0c5ae2e3fcb
> --- /dev/null
> +++ b/drivers/platform/x86/inspur-wmi.c
> @@ -0,0 +1,215 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Inspur WMI power mode
> + *
> + * Copyright (C) 2018 Ai Chao <aichao@...inos.cn>
> + */
> +
> +#include <linux/acpi.h>
> +#include <linux/device.h>
> +#include <linux/module.h>
> +#include <linux/platform_profile.h>
> +#include <linux/wmi.h>
> +
> +#define WMI_INSPUR_POWERMODE_BIOS_GUID "596C31E3-332D-43C9-AEE9-585493284F5D"
> +
> +enum inspur_wmi_method_ids {
> + INSPUR_WMI_GET_POWERMODE = 0x02,
> + INSPUR_WMI_SET_POWERMODE = 0x03,
> +};
> +
> +/**
> + * Power Mode:
> + * 0x0: Balance Mode
> + * 0x1: Performance Mode
> + * 0x2: Power Saver Mode
> + */
> +enum inspur_tmp_profile {
> + INSPUR_TMP_PROFILE_BALANCE = 0,
> + INSPUR_TMP_PROFILE_PERFORMANCE = 1,
> + INSPUR_TMP_PROFILE_POWERSAVE = 2,
> +};
> +
> +struct inspur_wmi_priv {
> + struct wmi_device *wdev;
> + struct platform_profile_handler handler;
> +};
> +
> +static int inspur_wmi_perform_query(struct wmi_device *wdev,
> + enum inspur_wmi_method_ids query_id,
> + void *buffer, size_t insize,
> + size_t outsize)
> +{
> + struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
> + struct acpi_buffer input = { insize, buffer};
> + union acpi_object *obj;
> + acpi_status status;
> + int ret = 0;
> +
> + status = wmidev_evaluate_method(wdev, 0, query_id, &input, &output);
> + if (ACPI_FAILURE(status)) {
> + dev_err(&wdev->dev, "EC Powermode control failed: %s\n",
> + acpi_format_exception(status));
> + return -EIO;
> + }
> +
> + obj = output.pointer;
> + if (!obj)
> + return -EINVAL;
> +
> + if (obj->type != ACPI_TYPE_BUFFER ||
> + obj->buffer.length != outsize) {
> + ret = -EINVAL;
> + goto out_free;
> + }
> +
> + memcpy(buffer, obj->buffer.pointer, obj->buffer.length);
> +
> +out_free:
> + kfree(obj);
> + return ret;
> +}
> +
> +/**
> + * Set Power Mode to EC RAM. If Power Mode value greater than 0x3,
> + * return error
> + * Method ID: 0x3
> + * Arg: 4 Bytes
> + * Byte [0]: Power Mode:
> + * 0x0: Balance Mode
> + * 0x1: Performance Mode
> + * 0x2: Power Saver Mode
> + * Return Value: 4 Bytes
> + * Byte [0]: Return Code
> + * 0x0: No Error
> + * 0x1: Error
> + */
> +static int inspur_platform_profile_set(struct platform_profile_handler *pprof,
> + enum platform_profile_option profile)
> +{
> + struct inspur_wmi_priv *priv = container_of(pprof, struct inspur_wmi_priv,
> + handler);
> + u8 ret_code[4] = {0, 0, 0, 0};
> + int ret;
> +
> + switch (profile) {
> + case PLATFORM_PROFILE_BALANCED:
> + ret_code[0] = INSPUR_TMP_PROFILE_BALANCE;
> + break;
> + case PLATFORM_PROFILE_PERFORMANCE:
> + ret_code[0] = INSPUR_TMP_PROFILE_PERFORMANCE;
> + break;
> + case PLATFORM_PROFILE_LOW_POWER:
> + ret_code[0] = INSPUR_TMP_PROFILE_POWERSAVE;
> + break;
> + default:
> + return -EOPNOTSUPP;
> + }
> +
> + ret = inspur_wmi_perform_query(priv->wdev, INSPUR_WMI_SET_POWERMODE,
> + ret_code, sizeof(ret_code),
> + sizeof(ret_code));
> +
> + if (ret < 0)
> + return ret;
> + else if (ret_code[0])
> + return -EBADRQC;
That "else" is pointless due to the early return. Please move the ret_code[0] check
out of the else clause, like this:
if (ret < 0)
return ret;
if (ret_code[0])
return -EBADRQC;
> +
> + return 0;
> +}
> +
> +/**
> + * Get Power Mode from EC RAM, If Power Mode value greater than 0x3,
> + * return error
> + * Method ID: 0x2
> + * Return Value: 4 Bytes
> + * Byte [0]: Return Code
> + * 0x0: No Error
> + * 0x1: Error
> + * Byte [1]: Power Mode
> + * 0x0: Balance Mode
> + * 0x1: Performance Mode
> + * 0x2: Power Saver Mode
> + */
> +static int inspur_platform_profile_get(struct platform_profile_handler *pprof,
> + enum platform_profile_option *profile)
> +{
> + struct inspur_wmi_priv *priv = container_of(pprof, struct inspur_wmi_priv,
> + handler);
> + u8 ret_code[4] = {0, 0, 0, 0};
> + int ret;
> +
> + ret = inspur_wmi_perform_query(priv->wdev, INSPUR_WMI_GET_POWERMODE,
> + &ret_code, sizeof(ret_code),
> + sizeof(ret_code));
> + if (ret < 0)
> + return ret;
> + else if (ret_code[0])
> + return -EBADRQC;
Same as above.
> +
> + switch (ret_code[1]) {
> + case INSPUR_TMP_PROFILE_BALANCE:
> + *profile = PLATFORM_PROFILE_BALANCED;
> + break;
> + case INSPUR_TMP_PROFILE_PERFORMANCE:
> + *profile = PLATFORM_PROFILE_PERFORMANCE;
> + break;
> + case INSPUR_TMP_PROFILE_POWERSAVE:
> + *profile = PLATFORM_PROFILE_LOW_POWER;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static int inspur_wmi_probe(struct wmi_device *wdev, const void *context)
> +{
> + struct inspur_wmi_priv *priv;
> +
> + priv = devm_kzalloc(&wdev->dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + priv->wdev = wdev;
> + dev_set_drvdata(&wdev->dev, priv);
> +
> + priv->handler.profile_get = inspur_platform_profile_get;
> + priv->handler.profile_set = inspur_platform_profile_set;
> +
> + set_bit(PLATFORM_PROFILE_LOW_POWER, priv->handler.choices);
> + set_bit(PLATFORM_PROFILE_BALANCED, priv->handler.choices);
> + set_bit(PLATFORM_PROFILE_PERFORMANCE, priv->handler.choices);
> +
> + platform_profile_register(&priv->handler);
> + return 0;
I said that the surface platform profile driver was a good example _except_ for this
minor issue. Please return the result of platform_profile_register(), see
https://lore.kernel.org/lkml/20231014235449.288702-1-W_Armin@gmx.de for an explanation.
Other than that and the remaining issues above, the driver looks good to me.
Armin Wolf
> +}
> +
> +static void inspur_wmi_remove(struct wmi_device *wdev)
> +{
> + platform_profile_remove();
> +}
> +
> +static const struct wmi_device_id inspur_wmi_id_table[] = {
> + { .guid_string = WMI_INSPUR_POWERMODE_BIOS_GUID },
> + { }
> +};
> +
> +MODULE_DEVICE_TABLE(wmi, inspur_wmi_id_table);
> +
> +static struct wmi_driver inspur_wmi_driver = {
> + .driver = {
> + .name = "inspur-wmi",
> + .probe_type = PROBE_PREFER_ASYNCHRONOUS,
> + },
> + .id_table = inspur_wmi_id_table,
> + .probe = inspur_wmi_probe,
> + .remove = inspur_wmi_remove,
> +};
> +
> +module_wmi_driver(inspur_wmi_driver);
> +
> +MODULE_AUTHOR("Ai Chao <aichao@...inos.cn>");
> +MODULE_DESCRIPTION("Inspur WMI hotkeys");
> +MODULE_LICENSE("GPL");
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