On 2014-09-16 12:40, Luca Ellero wrote:
Add function for reading from counter subdevice.
Signed-off-by: Luca Ellero <luca.ell...@brickedbrain.com>
---
drivers/staging/comedi/drivers/ni_usb6501.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/staging/comedi/drivers/ni_usb6501.c
b/drivers/staging/comedi/drivers/ni_usb6501.c
index 31a798e..ba2058b 100644
--- a/drivers/staging/comedi/drivers/ni_usb6501.c
+++ b/drivers/staging/comedi/drivers/ni_usb6501.c
@@ -467,6 +467,23 @@ static int ni6501_cnt_insn_config(struct comedi_device
*dev,
return ret;
}
+static int ni6501_cnt_insn_read(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn,
+ unsigned int *data)
+{
+ int ret;
+ u32 counter;
+
+ ret = ni6501_counter_command(dev, READ_COUNTER, &counter);
+ if (ret)
+ return ret;
+
+ data[0] = counter;
+
+ return insn->n;
+}
+
Generally, insn_read should read insn->n values, like this:
unsigned int i;
for (i = 0; i < insn->n; i++) {
ret = ni_6501_counter_command(dev, READ_COUNTER,
&counter);
if (ret)
return ret;
data[i] = counter;
}
return insn->n;
--
-=( Ian Abbott @ MEV Ltd. E-mail: <abbo...@mev.co.uk> )=-
-=( Tel: +44 (0)161 477 1898 FAX: +44 (0)161 718 3587 )=-
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