[PATCH 1/2] vga_switcheroo: Add a helper function to get the client state

[Takashi Iwai]

Add vga_switcheroo_get_client_state() to get the current state of the
client.  This is necessary to determine the proper initial state of
audio clients in HD-audio driver.

Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
 drivers/gpu/vga/vga_switcheroo.c |   13 +++++++++++++
 include/linux/vga_switcheroo.h   |    9 +++++++++
 2 files changed, 22 insertions(+)

diff --git a/drivers/gpu/vga/vga_switcheroo.c b/drivers/gpu/vga/vga_switcheroo.c
index 38f9534..eb4f64f 100644
--- a/drivers/gpu/vga/vga_switcheroo.c
+++ b/drivers/gpu/vga/vga_switcheroo.c
@@ -190,6 +190,19 @@ find_active_client(struct list_head *head)
        return NULL;
 }

+int vga_switcheroo_get_client_state(struct pci_dev *pdev)
+{
+       struct vga_switcheroo_client *client;
+
+       client = find_client_from_pci(&vgasr_priv.clients, pdev);
+       if (!client)
+               return VGA_SWITCHEROO_NOT_FOUND;
+       if (!vgasr_priv.active)
+               return VGA_SWITCHEROO_INIT;
+       return client->pwr_state;
+}
+EXPORT_SYMBOL(vga_switcheroo_get_client_state);
+
 void vga_switcheroo_unregister_client(struct pci_dev *pdev)
 {
        struct vga_switcheroo_client *client;
diff --git a/include/linux/vga_switcheroo.h b/include/linux/vga_switcheroo.h
index b455c7c..661fb7a 100644
--- a/include/linux/vga_switcheroo.h
+++ b/include/linux/vga_switcheroo.h
@@ -12,6 +12,9 @@
 enum vga_switcheroo_state {
        VGA_SWITCHEROO_OFF,
        VGA_SWITCHEROO_ON,
+       /* below are referred only from vga_switcheroo_get_client_state() */
+       VGA_SWITCHEROO_INIT,
+       VGA_SWITCHEROO_NOT_FOUND,
 };

 enum vga_switcheroo_client_id {
@@ -50,6 +53,8 @@ void vga_switcheroo_unregister_handler(void);

 int vga_switcheroo_process_delayed_switch(void);

+int vga_switcheroo_get_client_state(struct pci_dev *dev);
+
 #else

 static inline void vga_switcheroo_unregister_client(struct pci_dev *dev) {}
@@ -62,5 +67,9 @@ 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 int vga_switcheroo_get_client_state(struct pci_dev *dev) {
+       return VGA_SWITCHEROO_CLIENT_ON;
+}
+

 #endif
-- 
1.7.10.4