[PATCH 4/4] staging: comedi: comedi_test: implement INSN_CONFIG_GET_CMD_TIMING_CONSTRAINTS

[Spencer E. Olson]

Adds implementation of the new INSN_CONFIG_GET_CMD_TIMING_CONSTRAINTS
instruction.

Signed-off-by: Spencer E. Olson <olso...@umich.edu>
---
 drivers/staging/comedi/drivers/comedi_test.c | 44 ++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/drivers/staging/comedi/drivers/comedi_test.c 
b/drivers/staging/comedi/drivers/comedi_test.c
index d437af721bd8..ef4c7c8a2b71 100644
--- a/drivers/staging/comedi/drivers/comedi_test.c
+++ b/drivers/staging/comedi/drivers/comedi_test.c
@@ -626,6 +626,48 @@ static int waveform_ao_insn_write(struct comedi_device 
*dev,
        return insn->n;
 }
 
+static int waveform_ai_insn_config(struct comedi_device *dev,
+                                  struct comedi_subdevice *s,
+                                  struct comedi_insn *insn,
+                                  unsigned int *data)
+{
+       if (data[0] == INSN_CONFIG_GET_CMD_TIMING_CONSTRAINTS) {
+               /*
+                * input:  data[1], data[2] : scan_begin_src, convert_src
+                * output: data[1], data[2] : scan_begin_min, convert_min
+                */
+               if (data[1] == TRIG_FOLLOW) {
+                       /* exactly TRIG_FOLLOW case */
+                       data[1] = 0;
+                       data[2] = NSEC_PER_USEC;
+               } else {
+                       data[1] = NSEC_PER_USEC;
+                       if (data[2] & TRIG_TIMER)
+                               data[2] = NSEC_PER_USEC;
+                       else
+                               data[2] = 0;
+               }
+               return 0;
+       }
+
+       return -EINVAL;
+}
+
+static int waveform_ao_insn_config(struct comedi_device *dev,
+                                  struct comedi_subdevice *s,
+                                  struct comedi_insn *insn,
+                                  unsigned int *data)
+{
+       if (data[0] == INSN_CONFIG_GET_CMD_TIMING_CONSTRAINTS) {
+               /* we don't care about actual channels */
+               data[1] = NSEC_PER_USEC; /* scan_begin_min */
+               data[2] = 0;             /* convert_min */
+               return 0;
+       }
+
+       return -EINVAL;
+}
+
 static int waveform_common_attach(struct comedi_device *dev,
                                  int amplitude, int period)
 {
@@ -658,6 +700,7 @@ static int waveform_common_attach(struct comedi_device *dev,
        s->do_cmd = waveform_ai_cmd;
        s->do_cmdtest = waveform_ai_cmdtest;
        s->cancel = waveform_ai_cancel;
+       s->insn_config = waveform_ai_insn_config;
 
        s = &dev->subdevices[1];
        dev->write_subdev = s;
@@ -673,6 +716,7 @@ static int waveform_common_attach(struct comedi_device *dev,
        s->do_cmd = waveform_ao_cmd;
        s->do_cmdtest = waveform_ao_cmdtest;
        s->cancel = waveform_ao_cancel;
+       s->insn_config = waveform_ao_insn_config;
 
        /* Our default loopback value is just a 0V flatline */
        for (i = 0; i < s->n_chan; i++)
-- 
2.17.1

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