To clarify the analog output (*do_cmd) function, factor out the
code that starts the pacer.
Signed-off-by: H Hartley Sweeten <hswee...@visionengravers.com>
Cc: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/staging/comedi/drivers/amplc_pci224.c | 142 +++++++++++++-------------
1 file changed, 73 insertions(+), 69 deletions(-)
diff --git a/drivers/staging/comedi/drivers/amplc_pci224.c
b/drivers/staging/comedi/drivers/amplc_pci224.c
index a34bd9d..727fc22 100644
--- a/drivers/staging/comedi/drivers/amplc_pci224.c
+++ b/drivers/staging/comedi/drivers/amplc_pci224.c
@@ -901,9 +901,77 @@ pci224_ao_cmdtest(struct comedi_device *dev, struct
comedi_subdevice *s,
return 0;
}
-/*
- * 'do_cmd' function for AO subdevice.
- */
+static void pci224_ao_start_pacer(struct comedi_device *dev,
+ struct comedi_subdevice *s)
+{
+ struct pci224_private *devpriv = dev->private;
+ struct comedi_cmd *cmd = &s->async->cmd;
+ unsigned int div1, div2, round;
+ unsigned int ns = cmd->scan_begin_arg;
+ int round_mode = cmd->flags & TRIG_ROUND_MASK;
+
+ /* Check whether to use a single timer. */
+ switch (round_mode) {
+ case TRIG_ROUND_NEAREST:
+ default:
+ round = I8254_OSC_BASE_10MHZ / 2;
+ break;
+ case TRIG_ROUND_DOWN:
+ round = 0;
+ break;
+ case TRIG_ROUND_UP:
+ round = I8254_OSC_BASE_10MHZ - 1;
+ break;
+ }
+ /* Be careful to avoid overflow! */
+ div2 = cmd->scan_begin_arg / I8254_OSC_BASE_10MHZ;
+ div2 += (round + cmd->scan_begin_arg % I8254_OSC_BASE_10MHZ) /
+ I8254_OSC_BASE_10MHZ;
+ if (div2 <= 0x10000) {
+ /* A single timer will suffice. */
+ if (div2 < 2)
+ div2 = 2;
+ div2 &= 0xffff;
+ div1 = 1; /* Flag that single timer to be used. */
+ } else {
+ /* Use two timers. */
+ div1 = devpriv->cached_div1;
+ div2 = devpriv->cached_div2;
+ i8253_cascade_ns_to_timer(I8254_OSC_BASE_10MHZ,
+ &div1, &div2,
+ &ns, round_mode);
+ }
+
+ /*
+ * The output of timer Z2-0 will be used as the scan trigger
+ * source.
+ */
+ /* Make sure Z2-0 is gated on. */
+ outb(GAT_CONFIG(0, GAT_VCC),
+ devpriv->iobase1 + PCI224_ZGAT_SCE);
+ if (div1 == 1) {
+ /* Not cascading. Z2-0 needs 10 MHz clock. */
+ outb(CLK_CONFIG(0, CLK_10MHZ),
+ devpriv->iobase1 + PCI224_ZCLK_SCE);
+ } else {
+ /* Cascading with Z2-2. */
+ /* Make sure Z2-2 is gated on. */
+ outb(GAT_CONFIG(2, GAT_VCC),
+ devpriv->iobase1 + PCI224_ZGAT_SCE);
+ /* Z2-2 needs 10 MHz clock. */
+ outb(CLK_CONFIG(2, CLK_10MHZ),
+ devpriv->iobase1 + PCI224_ZCLK_SCE);
+ /* Load Z2-2 mode (2) and counter (div1). */
+ i8254_load(devpriv->iobase1 + PCI224_Z2_CT0, 0,
+ 2, div1, 2);
+ /* Z2-0 is clocked from Z2-2's output. */
+ outb(CLK_CONFIG(0, CLK_OUTNM1),
+ devpriv->iobase1 + PCI224_ZCLK_SCE);
+ }
+ /* Load Z2-0 mode (2) and counter (div2). */
+ i8254_load(devpriv->iobase1 + PCI224_Z2_CT0, 0, 0, div2, 2);
+}
+
static int pci224_ao_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
{
struct pci224_private *devpriv = dev->private;
@@ -959,72 +1027,8 @@ static int pci224_ao_cmd(struct comedi_device *dev,
struct comedi_subdevice *s)
outw(devpriv->daccon | PCI224_DACCON_FIFORESET,
dev->iobase + PCI224_DACCON);
- if (cmd->scan_begin_src == TRIG_TIMER) {
- unsigned int div1, div2, round;
- unsigned int ns = cmd->scan_begin_arg;
- int round_mode = cmd->flags & TRIG_ROUND_MASK;
-
- /* Check whether to use a single timer. */
- switch (round_mode) {
- case TRIG_ROUND_NEAREST:
- default:
- round = I8254_OSC_BASE_10MHZ / 2;
- break;
- case TRIG_ROUND_DOWN:
- round = 0;
- break;
- case TRIG_ROUND_UP:
- round = I8254_OSC_BASE_10MHZ - 1;
- break;
- }
- /* Be careful to avoid overflow! */
- div2 = cmd->scan_begin_arg / I8254_OSC_BASE_10MHZ;
- div2 += (round + cmd->scan_begin_arg % I8254_OSC_BASE_10MHZ) /
- I8254_OSC_BASE_10MHZ;
- if (div2 <= 0x10000) {
- /* A single timer will suffice. */
- if (div2 < 2)
- div2 = 2;
- div2 &= 0xffff;
- div1 = 1; /* Flag that single timer to be used. */
- } else {
- /* Use two timers. */
- div1 = devpriv->cached_div1;
- div2 = devpriv->cached_div2;
- i8253_cascade_ns_to_timer(I8254_OSC_BASE_10MHZ,
- &div1, &div2,
- &ns, round_mode);
- }
-
- /*
- * The output of timer Z2-0 will be used as the scan trigger
- * source.
- */
- /* Make sure Z2-0 is gated on. */
- outb(GAT_CONFIG(0, GAT_VCC),
- devpriv->iobase1 + PCI224_ZGAT_SCE);
- if (div1 == 1) {
- /* Not cascading. Z2-0 needs 10 MHz clock. */
- outb(CLK_CONFIG(0, CLK_10MHZ),
- devpriv->iobase1 + PCI224_ZCLK_SCE);
- } else {
- /* Cascading with Z2-2. */
- /* Make sure Z2-2 is gated on. */
- outb(GAT_CONFIG(2, GAT_VCC),
- devpriv->iobase1 + PCI224_ZGAT_SCE);
- /* Z2-2 needs 10 MHz clock. */
- outb(CLK_CONFIG(2, CLK_10MHZ),
- devpriv->iobase1 + PCI224_ZCLK_SCE);
- /* Load Z2-2 mode (2) and counter (div1). */
- i8254_load(devpriv->iobase1 + PCI224_Z2_CT0, 0,
- 2, div1, 2);
- /* Z2-0 is clocked from Z2-2's output. */
- outb(CLK_CONFIG(0, CLK_OUTNM1),
- devpriv->iobase1 + PCI224_ZCLK_SCE);
- }
- /* Load Z2-0 mode (2) and counter (div2). */
- i8254_load(devpriv->iobase1 + PCI224_Z2_CT0, 0, 0, div2, 2);
- }
+ if (cmd->scan_begin_src == TRIG_TIMER)
+ pci224_ao_start_pacer(dev, s);
/*
* Sort out end of acquisition.
--
1.9.2
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