staging: comedi: ke_counter: add ability to select counter clock source

Add an (*insn_config) to the counter subdevice to allow the user to select
the clock source for the counters using the INSN_CONFIG_SET_CLOCK_SRC
instruction. The current selection can be queried with the instruction
INSN_CONFIG_GET_CLOCK_SRC.

Also, handle the INSN_CONFIG_RESET instruction to reset all the counters.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 54 insertions, 3 deletions

diff --git a/drivers/staging/comedi/drivers/ke_counter.c b/drivers/staging/comedi/drivers/ke_counter.c
index ec43c38958de..ed873c45e011 100644
--- a/drivers/staging/comedi/drivers/ke_counter.c
+++ b/drivers/staging/comedi/drivers/ke_counter.c
@@ -93,6 +93,58 @@ static int ke_counter_insn_read(struct comedi_device *dev,
         return insn->n;
 }
 
+static void ke_counter_reset(struct comedi_device *dev)
+{
+        unsigned int chan;
+
+        for (chan = 0; chan < 3; chan++)
+                outb(0, dev->iobase + KE_RESET_REG(chan));
+}
+
+static int ke_counter_insn_config(struct comedi_device *dev,
+                                  struct comedi_subdevice *s,
+                                  struct comedi_insn *insn,
+                                  unsigned int *data)
+{
+        switch (data[0]) {
+        case INSN_CONFIG_SET_CLOCK_SRC:
+                switch (data[1]) {
+                case KE_OSC_SEL_EXT:    /* Pin 21 on D-sub */
+                case KE_OSC_SEL_4MHZ:   /* option */
+                case KE_OSC_SEL_20MHZ:  /* default */
+                        break;
+                default:
+                        return -EINVAL;
+                }
+                outb(data[1], dev->iobase + KE_OSC_SEL_REG);
+                break;
+        case INSN_CONFIG_GET_CLOCK_SRC:
+                data[1] = inb(dev->iobase + KE_OSC_SEL_REG);
+                switch (data[1]) {
+                case KE_OSC_SEL_EXT:
+                        data[2] = 0;    /* Unknown */
+                        break;
+                case KE_OSC_SEL_4MHZ:
+                        data[2] = 250;  /* 250ns */
+                        break;
+                case KE_OSC_SEL_20MHZ:
+                        data[2] = 50;   /* 50ns */
+                        break;
+                default:
+                        data[2] = 0;    /* Invalid? */
+                        break;
+                }
+                break;
+        case INSN_CONFIG_RESET:
+                ke_counter_reset(dev);
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        return insn->n;
+}
+
 static int ke_counter_do_insn_bits(struct comedi_device *dev,
                                    struct comedi_subdevice *s,
                                    struct comedi_insn *insn,
@@ -130,6 +182,7 @@ static int ke_counter_auto_attach(struct comedi_device *dev,
         s->range_table  = &range_unknown;
         s->insn_read    = ke_counter_insn_read;
         s->insn_write   = ke_counter_insn_write;
+        s->insn_config  = ke_counter_insn_config;
 
         s = &dev->subdevices[1];
         s->type         = COMEDI_SUBD_DO;
@@ -141,9 +194,7 @@ static int ke_counter_auto_attach(struct comedi_device *dev,
 
         outb(KE_OSC_SEL_20MHZ, dev->iobase + KE_OSC_SEL_REG);
 
-        outb(0, dev->iobase + KE_RESET_REG(0));
-        outb(0, dev->iobase + KE_RESET_REG(1));
-        outb(0, dev->iobase + KE_RESET_REG(2));
+        ke_counter_reset(dev);
 
         return 0;
 }