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Message-Id: <ff211830e3953c70aa8e0d43614619f1fb423668.1507156392.git.mario.limonciello@dell.com>
Date: Wed, 4 Oct 2017 17:48:31 -0500
From: Mario Limonciello <mario.limonciello@...l.com>
To: dvhart@...radead.org, Andy Shevchenko <andy.shevchenko@...il.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
platform-driver-x86@...r.kernel.org,
Andy Lutomirski <luto@...nel.org>, quasisec@...gle.com,
pali.rohar@...il.com, rjw@...ysocki.net, mjg59@...gle.com,
hch@....de, Greg KH <greg@...ah.com>,
Mario Limonciello <mario.limonciello@...l.com>
Subject: [PATCH v4 05/14] platform/x86: dell-wmi-descriptor: split WMI descriptor into it's own driver
All communication on individual GUIDs should occur in separate drivers.
Allowing a driver to communicate with the bus to another GUID is just
a hack that discourages drivers to adopt the bus model.
The information found from the WMI descriptor driver is now exported
for use by other drivers.
Signed-off-by: Mario Limonciello <mario.limonciello@...l.com>
---
MAINTAINERS | 5 +
drivers/platform/x86/Kconfig | 12 +++
drivers/platform/x86/Makefile | 1 +
drivers/platform/x86/dell-wmi-descriptor.c | 162 +++++++++++++++++++++++++++++
drivers/platform/x86/dell-wmi-descriptor.h | 18 ++++
drivers/platform/x86/dell-wmi.c | 88 ++--------------
6 files changed, 205 insertions(+), 81 deletions(-)
create mode 100644 drivers/platform/x86/dell-wmi-descriptor.c
create mode 100644 drivers/platform/x86/dell-wmi-descriptor.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 08b96f77f618..659dbeec4191 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4002,6 +4002,11 @@ M: Pali Rohár <pali.rohar@...il.com>
S: Maintained
F: drivers/platform/x86/dell-wmi.c
+DELL WMI DESCRIPTOR DRIVER
+M: Mario Limonciello <mario.limonciello@...l.com>
+S: Maintained
+F: drivers/platform/x86/dell-wmi-descriptor.c
+
DELTA ST MEDIA DRIVER
M: Hugues Fruchet <hugues.fruchet@...com>
L: linux-media@...r.kernel.org
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 1f7959ff055c..bc347c326d87 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -121,6 +121,7 @@ config DELL_WMI
depends on DMI
depends on INPUT
depends on ACPI_VIDEO || ACPI_VIDEO = n
+ depends on DELL_WMI_DESCRIPTOR
select DELL_SMBIOS
select INPUT_SPARSEKMAP
---help---
@@ -129,6 +130,17 @@ config DELL_WMI
To compile this driver as a module, choose M here: the module will
be called dell-wmi.
+config DELL_WMI_DESCRIPTOR
+ tristate "Dell WMI descriptor"
+ depends on ACPI_WMI
+ default ACPI_WMI
+ ---help---
+ Say Y here if you want to be able to read the format of WMI
+ communications on some Dell laptops, desktops and IoT gateways.
+
+ To compile this driver as a module, choose M here: the module will
+ be called dell-wmi-descriptor.
+
config DELL_WMI_AIO
tristate "WMI Hotkeys for Dell All-In-One series"
depends on ACPI_WMI
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 2b315d0df3b7..8636f5d3424f 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_COMPAL_LAPTOP) += compal-laptop.o
obj-$(CONFIG_DELL_SMBIOS) += dell-smbios.o
obj-$(CONFIG_DELL_LAPTOP) += dell-laptop.o
obj-$(CONFIG_DELL_WMI) += dell-wmi.o
+obj-$(CONFIG_DELL_WMI_DESCRIPTOR) += dell-wmi-descriptor.o
obj-$(CONFIG_DELL_WMI_AIO) += dell-wmi-aio.o
obj-$(CONFIG_DELL_WMI_LED) += dell-wmi-led.o
obj-$(CONFIG_DELL_SMO8800) += dell-smo8800.o
diff --git a/drivers/platform/x86/dell-wmi-descriptor.c b/drivers/platform/x86/dell-wmi-descriptor.c
new file mode 100644
index 000000000000..5c2bdda11916
--- /dev/null
+++ b/drivers/platform/x86/dell-wmi-descriptor.c
@@ -0,0 +1,162 @@
+/*
+ * Dell WMI descriptor driver
+ *
+ * Copyright (C) 2017 Dell Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * 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.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/acpi.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/wmi.h>
+#include "dell-wmi-descriptor.h"
+
+#define DELL_WMI_DESCRIPTOR_GUID "8D9DDCBC-A997-11DA-B012-B622A1EF5492"
+
+struct descriptor_priv {
+ struct list_head list;
+ u32 interface_version;
+ u32 size;
+};
+static LIST_HEAD(wmi_list);
+
+bool dell_wmi_get_interface_version(u32 *version)
+{
+ struct descriptor_priv *priv;
+
+ priv = list_first_entry_or_null(&wmi_list,
+ struct descriptor_priv,
+ list);
+ if (!priv)
+ return false;
+ *version = priv->interface_version;
+ return true;
+}
+EXPORT_SYMBOL_GPL(dell_wmi_get_interface_version);
+
+bool dell_wmi_get_size(u32 *size)
+{
+ struct descriptor_priv *priv;
+
+ priv = list_first_entry_or_null(&wmi_list,
+ struct descriptor_priv,
+ list);
+ if (!priv)
+ return false;
+ *size = priv->size;
+ return true;
+}
+EXPORT_SYMBOL_GPL(dell_wmi_get_size);
+
+/*
+ * Descriptor buffer is 128 byte long and contains:
+ *
+ * Name Offset Length Value
+ * Vendor Signature 0 4 "DELL"
+ * Object Signature 4 4 " WMI"
+ * WMI Interface Version 8 4 <version>
+ * WMI buffer length 12 4 4096 or 32768
+ */
+static int dell_wmi_descriptor_probe(struct wmi_device *wdev)
+{
+ union acpi_object *obj = NULL;
+ struct descriptor_priv *priv;
+ u32 *buffer;
+ int ret;
+
+ obj = wmidev_block_query(wdev, 0);
+ if (!obj) {
+ dev_err(&wdev->dev, "failed to read Dell WMI descriptor\n");
+ ret = -EIO;
+ goto out;
+ }
+
+ if (obj->type != ACPI_TYPE_BUFFER) {
+ dev_err(&wdev->dev, "Dell descriptor has wrong type\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* Although it's not technically a failure, this would lead to
+ * unexpected behavior
+ */
+ if (obj->buffer.length != 128) {
+ dev_err(&wdev->dev,
+ "Dell descriptor buffer has unexpected length (%d)\n",
+ obj->buffer.length);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ buffer = (u32 *)obj->buffer.pointer;
+
+ if (strncmp(obj->string.pointer, "DELL WMI", 8) != 0) {
+ dev_err(&wdev->dev, "Dell descriptor buffer has invalid signature (%8ph)\n",
+ buffer);
+ ret = -EINVAL;
+ goto out;
+ }
+ if (buffer[2] != 0 && buffer[2] != 1)
+ dev_warn(&wdev->dev, "Dell descriptor buffer has unknown version (%u)\n",
+ buffer[2]);
+
+ if (buffer[3] != 4096 && buffer[3] != 32768)
+ dev_warn(&wdev->dev, "Dell descriptor buffer has unexpected buffer length (%u)\n",
+ buffer[3]);
+
+ priv = devm_kzalloc(&wdev->dev, sizeof(struct descriptor_priv),
+ GFP_KERNEL);
+
+ priv->interface_version = buffer[2];
+ priv->size = buffer[3];
+ ret = 0;
+ dev_set_drvdata(&wdev->dev, priv);
+ list_add_tail(&priv->list, &wmi_list);
+
+ /* remove me */
+ dev_info(&wdev->dev, "Detected Dell WMI interface version %u and buffer size %u\n",
+ priv->interface_version, priv->size);
+
+out:
+ kfree(obj);
+ return ret;
+}
+
+static int dell_wmi_descriptor_remove(struct wmi_device *wdev)
+{
+ struct descriptor_priv *priv = dev_get_drvdata(&wdev->dev);
+
+ list_del(&priv->list);
+ return 0;
+}
+
+static const struct wmi_device_id dell_wmi_descriptor_id_table[] = {
+ { .guid_string = DELL_WMI_DESCRIPTOR_GUID },
+ { },
+};
+
+static struct wmi_driver dell_wmi_descriptor_driver = {
+ .driver = {
+ .name = "dell-wmi-descriptor",
+ },
+ .probe = dell_wmi_descriptor_probe,
+ .remove = dell_wmi_descriptor_remove,
+ .id_table = dell_wmi_descriptor_id_table,
+};
+
+module_wmi_driver(dell_wmi_descriptor_driver);
+
+MODULE_ALIAS("wmi:" DELL_WMI_DESCRIPTOR_GUID);
+MODULE_AUTHOR("Mario Limonciello <mario.limonciello@...l.com>");
+MODULE_DESCRIPTION("Dell WMI descriptor driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/platform/x86/dell-wmi-descriptor.h b/drivers/platform/x86/dell-wmi-descriptor.h
new file mode 100644
index 000000000000..3e652c6da034
--- /dev/null
+++ b/drivers/platform/x86/dell-wmi-descriptor.h
@@ -0,0 +1,18 @@
+/*
+ *
+ * Copyright (c) 2017 Dell Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _DELL_WMI_DESCRIPTOR_H_
+#define _DELL_WMI_DESCRIPTOR_H_
+
+#include <linux/wmi.h>
+
+bool dell_wmi_get_interface_version(u32 *version);
+bool dell_wmi_get_size(u32 *size);
+
+#endif
diff --git a/drivers/platform/x86/dell-wmi.c b/drivers/platform/x86/dell-wmi.c
index 1366bccdf275..90d7e8e55e9b 100644
--- a/drivers/platform/x86/dell-wmi.c
+++ b/drivers/platform/x86/dell-wmi.c
@@ -39,6 +39,7 @@
#include <linux/wmi.h>
#include <acpi/video.h>
#include "dell-smbios.h"
+#include "dell-wmi-descriptor.h"
MODULE_AUTHOR("Matthew Garrett <mjg@...hat.com>");
MODULE_AUTHOR("Pali Rohár <pali.rohar@...il.com>");
@@ -46,7 +47,6 @@ MODULE_DESCRIPTION("Dell laptop WMI hotkeys driver");
MODULE_LICENSE("GPL");
#define DELL_EVENT_GUID "9DBB5994-A997-11DA-B012-B622A1EF5492"
-#define DELL_DESCRIPTOR_GUID "8D9DDCBC-A997-11DA-B012-B622A1EF5492"
static bool wmi_requires_smbios_request;
@@ -54,7 +54,6 @@ MODULE_ALIAS("wmi:"DELL_EVENT_GUID);
struct dell_wmi_priv {
struct input_dev *input_dev;
- u32 interface_version;
};
static int __init dmi_matched(const struct dmi_system_id *dmi)
@@ -347,9 +346,9 @@ static void dell_wmi_process_key(struct wmi_device *wdev, int type, int code)
static void dell_wmi_notify(struct wmi_device *wdev,
union acpi_object *obj)
{
- struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
u16 *buffer_entry, *buffer_end;
acpi_size buffer_size;
+ u32 interface_version;
int len, i;
if (obj->type != ACPI_TYPE_BUFFER) {
@@ -376,7 +375,11 @@ static void dell_wmi_notify(struct wmi_device *wdev,
* So to prevent reading garbage from buffer we will process only first
* one event on devices with WMI interface version 0.
*/
- if (priv->interface_version == 0 && buffer_entry < buffer_end)
+ if (!dell_wmi_get_interface_version(&interface_version)) {
+ pr_warn("WMI descriptor driver not ready or unavailable");
+ return;
+ }
+ if (interface_version == 0 && buffer_entry < buffer_end)
if (buffer_end > buffer_entry + buffer_entry[0] + 1)
buffer_end = buffer_entry + buffer_entry[0] + 1;
@@ -617,78 +620,6 @@ static void dell_wmi_input_destroy(struct wmi_device *wdev)
input_unregister_device(priv->input_dev);
}
-/*
- * Descriptor buffer is 128 byte long and contains:
- *
- * Name Offset Length Value
- * Vendor Signature 0 4 "DELL"
- * Object Signature 4 4 " WMI"
- * WMI Interface Version 8 4 <version>
- * WMI buffer length 12 4 4096 or 32768
- */
-static int dell_wmi_check_descriptor_buffer(struct wmi_device *wdev)
-{
- struct dell_wmi_priv *priv = dev_get_drvdata(&wdev->dev);
- union acpi_object *obj = NULL;
- struct wmi_device *desc_dev;
- u32 *buffer;
- int ret;
-
- desc_dev = wmidev_get_other_guid(wdev, DELL_DESCRIPTOR_GUID);
- if (!desc_dev) {
- dev_err(&wdev->dev, "Dell WMI descriptor does not exist\n");
- return -ENODEV;
- }
-
- obj = wmidev_block_query(desc_dev, 0);
- if (!obj) {
- dev_err(&wdev->dev, "failed to read Dell WMI descriptor\n");
- ret = -EIO;
- goto out;
- }
-
- if (obj->type != ACPI_TYPE_BUFFER) {
- dev_err(&wdev->dev, "Dell descriptor has wrong type\n");
- ret = -EINVAL;
- goto out;
- }
-
- if (obj->buffer.length != 128) {
- dev_err(&wdev->dev,
- "Dell descriptor buffer has invalid length (%d)\n",
- obj->buffer.length);
- ret = -EINVAL;
- goto out;
- }
-
- buffer = (u32 *)obj->buffer.pointer;
-
- if (strncmp(obj->string.pointer, "DELL WMI", 8) != 0) {
- dev_err(&wdev->dev, "Dell descriptor buffer has invalid signature (%8ph)\n",
- buffer);
- ret = -EINVAL;
- goto out;
- }
- if (buffer[2] != 0 && buffer[2] != 1)
- dev_warn(&wdev->dev, "Dell descriptor buffer has unknown version (%u)\n",
- buffer[2]);
-
- if (desc_buffer[3] != 4096 && desc_buffer[3] != 32768)
- dev_warn(&wdev->dev, "Dell descriptor buffer has invalid buffer length (%u)\n",
- buffer[3]);
-
- priv->interface_version = buffer[2];
- ret = 0;
-
- dev_info(&wdev->dev, "Detected Dell WMI interface version %u\n",
- priv->interface_version);
-
-out:
- kfree(obj);
- put_device(&desc_dev->dev);
- return ret;
-}
-
/*
* According to Dell SMBIOS documentation:
*
@@ -724,7 +655,6 @@ static int dell_wmi_events_set_enabled(bool enable)
static int dell_wmi_probe(struct wmi_device *wdev)
{
struct dell_wmi_priv *priv;
- int err;
priv = devm_kzalloc(
&wdev->dev, sizeof(struct dell_wmi_priv), GFP_KERNEL);
@@ -732,10 +662,6 @@ static int dell_wmi_probe(struct wmi_device *wdev)
return -ENOMEM;
dev_set_drvdata(&wdev->dev, priv);
- err = dell_wmi_check_descriptor_buffer(wdev);
- if (err)
- return err;
-
return dell_wmi_input_setup(wdev);
}
--
2.14.1
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