[PATCH v2] platform/x86: support to store/show powermode value for Inspur
From: Ai Chao
Date: Fri Oct 13 2023 - 23:29:05 EST
Support to store/show powermode value for Inspur by WMI interface.
This driver provides support for Inspur WMI hotkeys. User used Fn+Q to
change the power mode. If desktop applications receive hotkey(Fn+Q)
event, then it get the currently power mode and change the power mode.
The desktop applications modify brightness and cpufreq based on
power mode.
change for v2
- Remove Event GUID, remove inspur_wmi_notify and inspur_wmi_notify.
- Add more explanation.
Signed-off-by: Ai Chao <aichao@xxxxxxxxxx>
---
drivers/platform/x86/Kconfig | 14 ++
drivers/platform/x86/Makefile | 3 +
drivers/platform/x86/inspur-wmi.c | 210 ++++++++++++++++++++++++++++++
3 files changed, 227 insertions(+)
create mode 100644 drivers/platform/x86/inspur-wmi.c
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 2a1070543391..fa2a4335c83d 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -988,6 +988,20 @@ 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 hotkeys driver"
+ depends on ACPI_WMI
+ depends on INPUT
+ help
+ This driver provides support for Inspur WMI hotkeys.
+ User used Fn+Q to change the power mode. If desktop applications
+ receive hotkeys(Fn+Q) event, then it get the currently power mode
+ and change the power mode. The desktop applications modify brightness
+ and cpufreq based on power mode.
+
+ 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..ef6cfd87f074
--- /dev/null
+++ b/drivers/platform/x86/inspur-wmi.c
@@ -0,0 +1,210 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Inspur WMI hotkeys
+ *
+ * Copyright (C) 2018 Ai Chao <aichao@xxxxxxxxxx>
+ */
+
+#include <linux/acpi.h>
+#include <linux/device.h>
+#include <linux/input.h>
+#include <linux/module.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,
+};
+
+struct inspur_wmi_priv {
+ struct input_dev *idev;
+ struct wmi_device *wdev;
+};
+
+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)
+{
+ union acpi_object *obj;
+ acpi_status status;
+ int ret = 0;
+ struct acpi_buffer input = { insize, buffer};
+ struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+
+ 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) {
+ ret = -EINVAL;
+ goto out_free;
+ }
+
+ /* Ignore output data of zero size */
+ if (!outsize)
+ goto out_free;
+
+ if (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 ssize_t powermode_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct inspur_wmi_priv *priv = dev_get_drvdata(dev);
+ int ret;
+ u32 mode;
+ u8 *ret_code;
+
+ ret = kstrtoint(buf, 0, &mode);
+ if (ret)
+ return ret;
+
+ ret = inspur_wmi_perform_query(priv->wdev,
+ INSPUR_WMI_SET_POWERMODE,
+ &mode, sizeof(mode), sizeof(mode));
+
+ if (ret < 0)
+ return ret;
+
+ ret_code = (u8 *)(&mode);
+ if (ret_code[0])
+ return -EBADRQC;
+
+ return count;
+}
+
+/**
+ * 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 ssize_t powermode_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct inspur_wmi_priv *priv = dev_get_drvdata(dev);
+ u32 mode = 0;
+ int ret;
+ u8 *ret_code;
+
+ ret = inspur_wmi_perform_query(priv->wdev,
+ INSPUR_WMI_GET_POWERMODE,
+ &mode, sizeof(mode), sizeof(mode));
+ if (ret < 0)
+ return ret;
+
+ ret_code = (u8 *)(&mode);
+ if (ret_code[0])
+ return -EBADRQC;
+
+ return sprintf(buf, "%u\n", ret_code[1]);
+}
+
+static DEVICE_ATTR_RW(powermode);
+
+static struct attribute *inspur_wmi_attrs[] = {
+ &dev_attr_powermode.attr,
+ NULL,
+};
+
+static const struct attribute_group inspur_wmi_group = {
+ .attrs = inspur_wmi_attrs,
+};
+
+static const struct attribute_group *inspur_wmi_groups[] = {
+ &inspur_wmi_group,
+ NULL,
+};
+
+static int inspur_wmi_input_setup(struct wmi_device *wdev)
+{
+ struct inspur_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
+
+ priv->idev = devm_input_allocate_device(&wdev->dev);
+ if (!priv->idev)
+ return -ENOMEM;
+
+ priv->idev->name = "Inspur WMI hotkeys";
+ priv->idev->phys = "wmi/input0";
+ priv->idev->id.bustype = BUS_HOST;
+ priv->idev->dev.parent = &wdev->dev;
+
+ return input_register_device(priv->idev);
+}
+
+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);
+
+ return inspur_wmi_input_setup(wdev);
+}
+
+static const struct wmi_device_id inspur_wmi_id_table[] = {
+ { .guid_string = WMI_INSPUR_POWERMODE_BIOS_GUID },
+ { }
+};
+
+static struct wmi_driver inspur_wmi_driver = {
+ .driver = {
+ .name = "inspur-wmi",
+ .dev_groups = inspur_wmi_groups,
+ },
+ .id_table = inspur_wmi_id_table,
+ .probe = inspur_wmi_probe,
+};
+
+module_wmi_driver(inspur_wmi_driver);
+
+MODULE_DEVICE_TABLE(wmi, inspur_wmi_id_table);
+MODULE_AUTHOR("Ai Chao <aichao@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Inspur WMI hotkeys");
+MODULE_LICENSE("GPL");
--
2.25.1