From: Andy Lutomirski <l...@kernel.org>
Some subdrivers need to access sibling devices. This gives them a
clean way to do so.
Signed-off-by: Andy Lutomirski <l...@kernel.org>
Cc: Andy Lutomirski <l...@amacapital.net>
Cc: Mario Limonciello <mario_limoncie...@dell.com>
Cc: Pali Rohár <pali.ro...@gmail.com>
Cc: Rafael Wysocki <r...@rjwysocki.net>
Cc: linux-kernel@vger.kernel.org
Cc: platform-driver-...@vger.kernel.org
Cc: linux-a...@vger.kernel.org
Signed-off-by: Darren Hart (VMware) <dvh...@infradead.org>
---
drivers/platform/x86/wmi.c | 17 +++++++++++++++++
include/linux/wmi.h | 4 ++++
2 files changed, 21 insertions(+)
diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index f1c9464..8dd9988 100644
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -344,6 +344,23 @@ union acpi_object *wmidev_block_query(struct wmi_device
*wdev, u8 instance)
}
EXPORT_SYMBOL_GPL(wmidev_block_query);
+struct wmi_device *wmidev_get_other_guid(struct wmi_device *wdev,
+ const char *guid_string)
+{
+ struct wmi_block *this_wb = container_of(wdev, struct wmi_block, dev);
+ struct wmi_block *other_wb;
+
+ if (!find_guid(guid_string, &other_wb))
+ return NULL;
+
+ if (other_wb->acpi_device != this_wb->acpi_device)
+ return NULL;
+
+ get_device(&other_wb->dev.dev);
+ return &other_wb->dev;
+}
+EXPORT_SYMBOL_GPL(wmidev_get_other_guid);
+
/**
* wmi_set_block - Write to a WMI block
* @guid_string: 36 char string of the form
fa50ff2b-f2e8-45de-83fa-65417f2f49ba
diff --git a/include/linux/wmi.h b/include/linux/wmi.h
index 0ab2540..a283768 100644
--- a/include/linux/wmi.h
+++ b/include/linux/wmi.h
@@ -33,6 +33,10 @@ struct wmi_device {
extern union acpi_object *wmidev_block_query(struct wmi_device *wdev,
u8 instance);
+/* Gets another device on the same bus. Caller must put_device the result. */
+extern struct wmi_device *wmidev_get_other_guid(struct wmi_device *wdev,
+ const char *guid_string);
+
struct wmi_device_id {
const char *guid_string;
};
--
2.9.4
