V4L/DVB (5035): Pvrusb2: Enable radio mode round #2

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This is the logic that:
  a) Ensures /sys/class/pvrusb2/sn-*/ctl_frequency/{max,min}_val are
     "automagically" reset to sane values on each mode change.

  b) Allows tuning to a radio frequency by something like:
     echo `perl -e "print int(94.9*16000 + 0.5)"` \
       > /sys/class/pvrusb2/sn-*/ctl_input/cur_val


The trick was to take advantage of the already existing .get_{min,max}_value
function pointers in pvr2_ctrl, to "dynamically override" the hardcoded values
for min/max frequency at runtime.

For a moment I thought to dispose of the hardcoded MIN/MAX_FREQ and use the
hirange/lowrange fields of the v4l2_tuner struct instead, but then I see that
tuner-core.c kinda hardcodes these as well, so I decided to not bother.

Signed-off-by: Pantelis Koukousoulas <pakt223@freemail.gr>
Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

...

This commit is contained in:

Pantelis Koukousoulas 2006-12-27 23:06:04 -03:00 • committed by Mauro Carvalho Chehab

parent 275b2e283b

commit 25d8527a44

2 changed files with 37 additions and 6 deletions

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39

drivers/media/video/pvrusb2/pvrusb2-hdw.c

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4

drivers/media/video/pvrusb2/pvrusb2-i2c-cmd-v4l2.c

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