On Wed, Apr 24, 2013 at 11:36:02AM -0500, H Hartley Sweeten wrote:
> On Wednesday, April 24, 2013 2:09 AM, Ian Abbott wrote:
> > On 2013-04-23 20:58, H Hartley Sweeten wrote:
> >> The bits needed to set the analog input gain can be simply calculated
> >> based on the 'range'.
> >>
> >> The LabPC versions of the board do not have the '0x10' gain that the
> >> LabPC+ board supports. By incrementing the range appropriately the
> >> correct gain bits can still be calculated.
> >>
> >> This allows removing the two gain tables, as well as the export, along
> >> with the 'ai_range_code' data in the boardinfo.
> >>
> >> Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
> >> Cc: Ian Abbott <abbbotti@xxxxxxxxx>
> >> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> >> ---
> >> drivers/staging/comedi/drivers/ni_labpc.c | 30 +++++++++++++--------------
> >> drivers/staging/comedi/drivers/ni_labpc.h | 3 ---
> >> drivers/staging/comedi/drivers/ni_labpc_cs.c | 1 -
> >> drivers/staging/comedi/drivers/ni_labpc_pci.c | 1 -
> >> 4 files changed, 14 insertions(+), 21 deletions(-)
> >>
> >> diff --git a/drivers/staging/comedi/drivers/ni_labpc.c b/drivers/staging/comedi/drivers/ni_labpc.c
> >> index 5ed9a6f..773368d 100644
> >> --- a/drivers/staging/comedi/drivers/ni_labpc.c
> >> +++ b/drivers/staging/comedi/drivers/ni_labpc.c
> >> @@ -88,7 +88,7 @@
> >> #define CMD1_REG 0x00 /* W: Command 1 reg */
> >> #define CMD1_MA(x) (((x) & 0x7) << 0)
> >> #define CMD1_TWOSCMP (1 << 3)
> >> -#define CMD1_GAIN_MASK (7 << 4)
> >> +#define CMD1_GAIN(x) (((x) & 0x7) << 4)
> >> #define CMD1_SCANEN (1 << 7)
> >> #define CMD2_REG 0x01 /* W: Command 2 reg */
> >> #define CMD2_PRETRIG (1 << 0)
> >> @@ -153,11 +153,6 @@ enum scan_mode {
> >> MODE_MULT_CHAN_DOWN,
> >> };
> >>
> >> -static const int labpc_plus_ai_gain_bits[] = {
> >> - 0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70,
> >> - 0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70,
> >> -};
> >> -
> >> static const struct comedi_lrange range_labpc_plus_ai = {
> >> 16, {
> >> BIP_RANGE(5),
> >> @@ -179,12 +174,6 @@ static const struct comedi_lrange range_labpc_plus_ai = {
> >> }
> >> };
> >>
> >> -const int labpc_1200_ai_gain_bits[] = {
> >> - 0x00, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70,
> >> - 0x00, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70,
> >> -};
> >> -EXPORT_SYMBOL_GPL(labpc_1200_ai_gain_bits);
> >> -
> >> static const struct comedi_lrange range_labpc_1200_ai = {
> >> 14, {
> >> BIP_RANGE(5),
> >> @@ -237,20 +226,17 @@ static inline void labpc_writeb(unsigned int byte, unsigned long address)
> >> static const struct labpc_boardinfo labpc_boards[] = {
> >> {
> >> .name = "lab-pc-1200",
> >> - .ai_range_code = labpc_1200_ai_gain_bits,
> >> .ai_speed = 10000,
> >> .ai_scan_up = 1,
> >> .has_ao = 1,
> >> .is_labpc1200 = 1,
> >> }, {
> >> .name = "lab-pc-1200ai",
> >> - .ai_range_code = labpc_1200_ai_gain_bits,
> >> .ai_speed = 10000,
> >> .ai_scan_up = 1,
> >> .is_labpc1200 = 1,
> >> }, {
> >> .name = "lab-pc+",
> >> - .ai_range_code = labpc_plus_ai_gain_bits,
> >> .ai_speed = 12000,
> >> .has_ao = 1,
> >> },
> >> @@ -321,12 +307,24 @@ static void labpc_ai_set_chan_and_gain(struct comedi_device *dev,
> >> const struct labpc_boardinfo *board = comedi_board(dev);
> >> struct labpc_private *devpriv = dev->private;
> >>
> >> + if (board->is_labpc1200) {
> >> + /*
> >> + * The LabPC-1200 boards do not have a gain
> >> + * of '0x10'. Skip the range values that would
> >> + * result in this gain.
> >> + */
> >> + if (range > 1)
> >> + range++;
> >> + if (range > 8)
> >> + range++;
> >
> > Off-by one error. That would change the sequence 0 to 13 to the following:
> >
> > 0, 1, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15
> >
> > I think you meant:
> >
> > if (range > 0)
> > range++;
> > if (range > 8)
> > range++;
> >
> > which maps the sequence 0 to 13 to the following:
> >
> > 0, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15
>
> Ugh.. You are correct. Brain fart with that.
>
> > You could also use:
> >
> > range += (range > 0) + (range > 7);
> >
> > which I think is easier to understand (and doesn't need the curly braces).
>
> I like that one better. I'll update the patch.
>
> Greg,
>
> Do you want all four patchs again as v2 or just an update of this one?
Just an updated this one, I've applied the other 3.
thanks,
greg k-h
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