[PATCH for 2.6.37 REGRESSION] cx25840: Prevent device probefailure due to volume control ERANGE error

From: Andy Walls
Date: Sun Dec 05 2010 - 17:42:09 EST


This patch was created and tested against linux-next
( git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git ),
tag next-20101203, and fixes a regression that crept into 2.6.36.

The volume control scale in the cx25840 driver has an unusual mapping
from register values to v4l2 volume control values. Enforce the mapping
limits, so that the default volume control setting does not fall out of
bounds to prevent the cx25840 module device probe from failing.

Signed-off-by: Andy Walls <awalls@xxxxxxxxxxxxxxxx>
Cc: Hans Verkuil <hverkuil@xxxxxxxxx>
Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
---
drivers/media/video/cx25840/cx25840-core.c | 19 +++++++++++++++++--
1 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/media/video/cx25840/cx25840-core.c b/drivers/media/video/cx25840/cx25840-core.c
index dfb198d..f164618 100644
--- a/drivers/media/video/cx25840/cx25840-core.c
+++ b/drivers/media/video/cx25840/cx25840-core.c
@@ -1989,8 +1989,23 @@ static int cx25840_probe(struct i2c_client *client,
v4l2_ctrl_new_std(&state->hdl, &cx25840_ctrl_ops,
V4L2_CID_HUE, -128, 127, 1, 0);
if (!is_cx2583x(state)) {
- default_volume = 228 - cx25840_read(client, 0x8d4);
- default_volume = ((default_volume / 2) + 23) << 9;
+ default_volume = cx25840_read(client, 0x8d4);
+ /*
+ * Enforce the legacy PVR-350/MSP3400 to PVR-150/CX25843 volume
+ * scale mapping limits to avoid -ERANGE errors when
+ * initializing the volume control
+ */
+ if (default_volume > 228) {
+ /* Bottom out at -96 dB, v4l2 vol range 0x2e00-0x2fff */
+ default_volume = 228;
+ cx25840_write(client, 0x8d4, 228);
+ }
+ else if (default_volume < 20) {
+ /* Top out at + 8 dB, v4l2 vol range 0xfe00-0xffff */
+ default_volume = 20;
+ cx25840_write(client, 0x8d4, 20);
+ }
+ default_volume = (((228 - default_volume) >> 1) + 23) << 9;

state->volume = v4l2_ctrl_new_std(&state->hdl,
&cx25840_audio_ctrl_ops, V4L2_CID_AUDIO_VOLUME,
--
1.7.2.3



--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/