From 29ee9fbaa1bfa2e89fc7b5774f18d22bc20dd574 Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Wed, 5 Nov 2014 10:21:07 -0700 Subject: [PATCH] staging: comedi: usbduxsigma: use comedi_async 'scans_done' to detect AI EOA Remove the private data member 'ai_sample_count' and use the comedi_async 'scans_done' member to detect the analog input end-of-acquisition. Move the EOA check so it happens after adding the samples from the current urb to the async buffer. This prevents the unnecessary resubmit of the urb when the EOA occurs. Signed-off-by: H Hartley Sweeten Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/usbduxsigma.c | 22 ++++------------------ 1 file changed, 4 insertions(+), 18 deletions(-) diff --git a/drivers/staging/comedi/drivers/usbduxsigma.c b/drivers/staging/comedi/drivers/usbduxsigma.c index 31b2806..dc19435 100644 --- a/drivers/staging/comedi/drivers/usbduxsigma.c +++ b/drivers/staging/comedi/drivers/usbduxsigma.c @@ -164,8 +164,6 @@ struct usbduxsigma_private { unsigned ao_cmd_running:1; unsigned pwm_cmd_running:1; - /* number of samples to acquire */ - int ai_sample_count; /* time between samples in units of the timer */ unsigned int ai_timer; unsigned int ao_timer; @@ -226,14 +224,6 @@ static void usbduxsigma_ai_handle_urb(struct comedi_device *dev, if (devpriv->ai_counter == 0) { devpriv->ai_counter = devpriv->ai_timer; - if (cmd->stop_src == TRIG_COUNT) { - devpriv->ai_sample_count--; - if (devpriv->ai_sample_count < 0) { - async->events |= COMEDI_CB_EOA; - return; - } - } - /* get the state of the dio pins to allow external trigger */ dio_state = be32_to_cpu(devpriv->in_buf[0]); @@ -247,6 +237,10 @@ static void usbduxsigma_ai_handle_urb(struct comedi_device *dev, if (!comedi_buf_write_samples(s, &val, 1)) return; } + + if (cmd->stop_src == TRIG_COUNT && + async->scans_done >= cmd->stop_arg) + async->events |= COMEDI_CB_EOA; } /* if command is still running, resubmit urb */ @@ -578,14 +572,6 @@ static int usbduxsigma_ai_cmdtest(struct comedi_device *dev, if (devpriv->ai_timer < 1) err |= -EINVAL; - if (cmd->stop_src == TRIG_COUNT) { - /* data arrives as one packet */ - devpriv->ai_sample_count = cmd->stop_arg; - } else { - /* continuous acquisition */ - devpriv->ai_sample_count = 0; - } - if (err) return 4; -- 2.7.4