[PATCH 02/11] vga_switcheroo: Add helper function to get the active client

[Lukas Wunner]

From: Seth Forshee <seth.fors...@canonical.com>

Add vga_switcheroo_get_active_client() to allow drivers to get the
active video client. This will be used by drivers wishing to temporarily
mux only the DDC to the inactive client.

Signed-off-by: Seth Forshee <seth.forshee at canonical.com>
Signed-off-by: Dave Airlie <airlied at gmail.com>
Signed-off-by: Lukas Wunner <lukas at wunner.de>
---
 drivers/gpu/vga/vga_switcheroo.c | 14 ++++++++++++++
 include/linux/vga_switcheroo.h   |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/drivers/gpu/vga/vga_switcheroo.c b/drivers/gpu/vga/vga_switcheroo.c
index 0d3ac20..620c4ac 100644
--- a/drivers/gpu/vga/vga_switcheroo.c
+++ b/drivers/gpu/vga/vga_switcheroo.c
@@ -209,6 +209,20 @@ find_active_client(struct list_head *head)
        return NULL;
 }

+struct pci_dev *vga_switcheroo_get_active_client(void)
+{
+       struct vga_switcheroo_client *client;
+       struct pci_dev *pdev = NULL;
+
+       mutex_lock(&vgasr_mutex);
+       client = find_active_client(&vgasr_priv.clients);
+       if (client)
+               pdev = client->pdev;
+       mutex_unlock(&vgasr_mutex);
+       return pdev;
+}
+EXPORT_SYMBOL(vga_switcheroo_get_active_client);
+
 int vga_switcheroo_get_client_state(struct pci_dev *pdev)
 {
        struct vga_switcheroo_client *client;
diff --git a/include/linux/vga_switcheroo.h b/include/linux/vga_switcheroo.h
index 2fef78b..c81a686 100644
--- a/include/linux/vga_switcheroo.h
+++ b/include/linux/vga_switcheroo.h
@@ -62,6 +62,7 @@ void vga_switcheroo_unregister_handler(void);

 int vga_switcheroo_process_delayed_switch(void);

+struct pci_dev *vga_switcheroo_get_active_client(void);
 int vga_switcheroo_get_client_state(struct pci_dev *dev);

 void vga_switcheroo_set_dynamic_switch(struct pci_dev *pdev, enum 
vga_switcheroo_state dynamic);
@@ -82,6 +83,7 @@ static inline int vga_switcheroo_register_audio_client(struct 
pci_dev *pdev,
        int id, bool active) { return 0; }
 static inline void vga_switcheroo_unregister_handler(void) {}
 static inline int vga_switcheroo_process_delayed_switch(void) { return 0; }
+static inline struct pci_dev *vga_switcheroo_get_active_client(void) { return 
NULL; }
 static inline int vga_switcheroo_get_client_state(struct pci_dev *dev) { 
return VGA_SWITCHEROO_ON; }

 static inline void vga_switcheroo_set_dynamic_switch(struct pci_dev *pdev, 
enum vga_switcheroo_state dynamic) {}
-- 
1.8.5.2 (Apple Git-48)