[PATCH 3/4] staging: comedi: das6402: read analog input samples in interrupt handler

[H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>]

Currently the interrupt handler just clears the interrupt.

Add the code necessary to read the analog input samples when running
an async command.

Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/staging/comedi/drivers/das6402.c | 42 ++++++++++++++++++++++++++------
 1 file changed, 35 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/comedi/drivers/das6402.c b/drivers/staging/comedi/drivers/das6402.c
index 2a810b6..ed00ef2 100644
--- a/drivers/staging/comedi/drivers/das6402.c
+++ b/drivers/staging/comedi/drivers/das6402.c
@@ -193,12 +193,46 @@ static void das6402_enable_counter(struct comedi_device *dev, bool load)
 	}
 }
 
+static unsigned int das6402_ai_read_sample(struct comedi_device *dev,
+					   struct comedi_subdevice *s)
+{
+	unsigned int val;
+
+	val = inw(dev->iobase + DAS6402_AI_DATA_REG);
+	if (s->maxdata == 0x0fff)
+		val >>= 4;
+	return val;
+}
+
 static irqreturn_t das6402_interrupt(int irq, void *d)
 {
 	struct comedi_device *dev = d;
+	struct comedi_subdevice *s = dev->read_subdev;
+	struct comedi_async *async = s->async;
+	struct comedi_cmd *cmd = &async->cmd;
+	unsigned int status;
+
+	status = inb(dev->iobase + DAS6402_STATUS_REG);
+	if ((status & DAS6402_STATUS_INT) == 0)
+		return IRQ_NONE;
+
+	if (status & DAS6402_STATUS_FFULL) {
+		async->events |= COMEDI_CB_OVERFLOW;
+	} else if (status & DAS6402_STATUS_FFNE) {
+		unsigned int val;
+
+		val = das6402_ai_read_sample(dev, s);
+		comedi_buf_write_samples(s, &val, 1);
+
+		if (cmd->stop_src == TRIG_COUNT &&
+		    async->scans_done >= cmd->stop_arg)
+			async->events |= COMEDI_CB_EOA;
+	}
 
 	das6402_clear_all_interrupts(dev);
 
+	comedi_handle_events(dev, s);
+
 	return IRQ_HANDLED;
 }
 
@@ -367,7 +401,6 @@ static int das6402_ai_insn_read(struct comedi_device *dev,
 {
 	unsigned int chan = CR_CHAN(insn->chanspec);
 	unsigned int aref = CR_AREF(insn->chanspec);
-	unsigned int val;
 	int ret;
 	int i;
 
@@ -391,12 +424,7 @@ static int das6402_ai_insn_read(struct comedi_device *dev,
 		if (ret)
 			break;
 
-		val = inw(dev->iobase + DAS6402_AI_DATA_REG);
-
-		if (s->maxdata == 0x0fff)
-			val >>= 4;
-
-		data[i] = val;
+		data[i] = das6402_ai_read_sample(dev, s);
 	}
 
 	das6402_ai_clear_eoc(dev);
-- 
2.0.3

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