ALSA: maestro3: Enable docking support for Dell Latitude C810

Enable I2S docking for Dell Latitude C810.
This allows the audio output on C/Port II to work (and probably also
the audio inputs on C/Dock II).

The volume can't be adjusted - none of the mixer controls currently
supported affects the I2S output (they belong to the STAC9721/23 AC'97
codec responsible for the laptop internal connectors & speakers).

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 11 insertions, 4 deletions

diff --git a/sound/pci/maestro3.c b/sound/pci/maestro3.c
index 72e89cedc52d..965d5c6f2fa0 100644
--- a/sound/pci/maestro3.c
+++ b/sound/pci/maestro3.c
@@ -1932,12 +1932,19 @@ snd_m3_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val)
 }
 
 
-static void snd_m3_remote_codec_config(int io, int isremote)
+static void snd_m3_remote_codec_config(struct snd_m3 *chip, int isremote)
 {
+        int io = chip->iobase;
+        u16 tmp;
+
         isremote = isremote ? 1 : 0;
 
-        outw((inw(io + RING_BUS_CTRL_B) & ~SECOND_CODEC_ID_MASK) | isremote,
-             io + RING_BUS_CTRL_B);
+        tmp = inw(io + RING_BUS_CTRL_B) & ~SECOND_CODEC_ID_MASK;
+        /* enable dock on Dell Latitude C810 */
+        if (chip->pci->subsystem_vendor == 0x1028 &&
+            chip->pci->subsystem_device == 0x00e5)
+                tmp |= M3I_DOCK_ENABLE;
+        outw(tmp | isremote, io + RING_BUS_CTRL_B);
         outw((inw(io + SDO_OUT_DEST_CTRL) & ~COMMAND_ADDR_OUT) | isremote,
              io + SDO_OUT_DEST_CTRL);
         outw((inw(io + SDO_IN_DEST_CTRL) & ~STATUS_ADDR_IN) | isremote,
@@ -1989,7 +1996,7 @@ static void snd_m3_ac97_reset(struct snd_m3 *chip)
                 if (!chip->irda_workaround)
                         dir |= 0x10; /* assuming pci bus master? */
 
-                snd_m3_remote_codec_config(io, 0);
+                snd_m3_remote_codec_config(chip, 0);
 
                 outw(IO_SRAM_ENABLE, io + RING_BUS_CTRL_A);
                 udelay(20);