From: H Hartley Sweeten Date: Tue, 11 Sep 2012 01:55:54 +0000 (-0700) Subject: staging: comedi: adl_pci9111: cleanup ai read in pci9111_ai_insn_read() X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2f002cc9b8c5e59d3e67a184d7b1520fed9e3094;p=linux-beck.git staging: comedi: adl_pci9111: cleanup ai read in pci9111_ai_insn_read() The shift, maxdata, and invert values, used to handle the 12-/16-bit analog input differences, can be calculated based on the subdevice maxdata value. Signed-off-by: H Hartley Sweeten Cc: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/comedi/drivers/adl_pci9111.c b/drivers/staging/comedi/drivers/adl_pci9111.c index b009c7b6a65e..0093a401e447 100644 --- a/drivers/staging/comedi/drivers/adl_pci9111.c +++ b/drivers/staging/comedi/drivers/adl_pci9111.c @@ -966,10 +966,11 @@ static int pci9111_ai_insn_read(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_insn *insn, unsigned int *data) { - int resolution = - ((struct pci9111_board *)dev->board_ptr)->ai_resolution; - - int timeout, i; + unsigned int maxdata = s->maxdata; + unsigned int invert = (maxdata + 1) >> 1; + unsigned int shift = (maxdata == 0xffff) ? 0 : 4; + int timeout; + int i; pci9111_ai_channel_set(CR_CHAN((&insn->chanspec)[0])); @@ -995,14 +996,8 @@ static int pci9111_ai_insn_read(struct comedi_device *dev, conversion_done: - if (resolution == PCI9111_HR_AI_RESOLUTION) - data[i] = (inw(dev->iobase + PCI9111_AI_FIFO_REG) - & PCI9111_HR_AI_RESOLUTION_MASK) - ^ PCI9111_HR_AI_RESOLUTION_2_CMP_BIT; - else - data[i] = ((inw(dev->iobase + PCI9111_AI_FIFO_REG) >> 4) - & PCI9111_AI_RESOLUTION_MASK) - ^ PCI9111_AI_RESOLUTION_2_CMP_BIT; + data[i] = inw(dev->iobase + PCI9111_AI_FIFO_REG); + data[i] = ((data[i] >> shift) & maxdata) ^ invert; } return i;