staging: comedi: me4000: comedi_handle_events() will stop conversions

The irq handler does not need to manually stop conversions and disable
interrupts when "end-of-acquisition", "error", or "overflow" events are
detected. The comedi_handle_events() will call the subdevice (*cancel)
when these are detected and stop the acquisition.

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>

diff --git a/drivers/staging/comedi/drivers/me4000.c b/drivers/staging/comedi/drivers/me4000.c
index b2d9d61..b17183d 100644 (file)
--- a/drivers/staging/comedi/drivers/me4000.c
+++ b/drivers/staging/comedi/drivers/me4000.c
@@ -939,41 +939,17 @@ static irqreturn_t me4000_ai_isr(int irq, void *dev_id)
                if (!(tmp & ME4000_AI_STATUS_FF_DATA) &&
                    !(tmp & ME4000_AI_STATUS_HF_DATA) &&
                    (tmp & ME4000_AI_STATUS_EF_DATA)) {
-                       c = ME4000_AI_FIFO_COUNT;
-
-                       /*
-                        * FIFO overflow, so stop conversion
-                        * and disable all interrupts
-                        */
-                       tmp |= ME4000_AI_CTRL_IMMEDIATE_STOP;
-                       tmp &= ~(ME4000_AI_CTRL_HF_IRQ |
-                                ME4000_AI_CTRL_SC_IRQ);
-                       outl(tmp, dev->iobase + ME4000_AI_CTRL_REG);
-
-                       s->async->events |= COMEDI_CB_ERROR;
-
                        dev_err(dev->class_dev, "FIFO overflow\n");
+                       s->async->events |= COMEDI_CB_ERROR;
+                       c = ME4000_AI_FIFO_COUNT;
                } else if ((tmp & ME4000_AI_STATUS_FF_DATA) &&
                           !(tmp & ME4000_AI_STATUS_HF_DATA) &&
                           (tmp & ME4000_AI_STATUS_EF_DATA)) {
                        c = ME4000_AI_FIFO_COUNT / 2;
                } else {
-                       dev_err(dev->class_dev,
-                               "Can't determine state of fifo\n");
-                       c = 0;
-
-                       /*
-                        * Undefined state, so stop conversion
-                        * and disable all interrupts
-                        */
-                       tmp |= ME4000_AI_CTRL_IMMEDIATE_STOP;
-                       tmp &= ~(ME4000_AI_CTRL_HF_IRQ |
-                                ME4000_AI_CTRL_SC_IRQ);
-                       outl(tmp, dev->iobase + ME4000_AI_CTRL_REG);
-
-                       s->async->events |= COMEDI_CB_ERROR;
-
                        dev_err(dev->class_dev, "Undefined FIFO state\n");
+                       s->async->events |= COMEDI_CB_ERROR;
+                       c = 0;
                }
 
                for (i = 0; i < c; i++) {
@@ -981,17 +957,8 @@ static irqreturn_t me4000_ai_isr(int irq, void *dev_id)
                        lval = inl(dev->iobase + ME4000_AI_DATA_REG) & 0xFFFF;
                        lval ^= 0x8000;
 
-                       if (!comedi_buf_write_samples(s, &lval, 1)) {
-                               /*
-                                * Buffer overflow, so stop conversion
-                                * and disable all interrupts
-                                */
-                               tmp |= ME4000_AI_CTRL_IMMEDIATE_STOP;
-                               tmp &= ~(ME4000_AI_CTRL_HF_IRQ |
-                                        ME4000_AI_CTRL_SC_IRQ);
-                               outl(tmp, dev->iobase + ME4000_AI_CTRL_REG);
+                       if (!comedi_buf_write_samples(s, &lval, 1))
                                break;
-                       }
                }
 
                /* Work is done, so reset the interrupt */
@@ -1003,17 +970,9 @@ static irqreturn_t me4000_ai_isr(int irq, void *dev_id)
 
        if (inl(dev->iobase + ME4000_IRQ_STATUS_REG) &
            ME4000_IRQ_STATUS_SC) {
+               /* Acquisition is complete */
                s->async->events |= COMEDI_CB_EOA;
 
-               /*
-                * Acquisition is complete, so stop
-                * conversion and disable all interrupts
-                */
-               tmp = inl(dev->iobase + ME4000_AI_CTRL_REG);
-               tmp |= ME4000_AI_CTRL_IMMEDIATE_STOP;
-               tmp &= ~(ME4000_AI_CTRL_HF_IRQ | ME4000_AI_CTRL_SC_IRQ);
-               outl(tmp, dev->iobase + ME4000_AI_CTRL_REG);
-
                /* Poll data until fifo empty */
                while (inl(dev->iobase + ME4000_AI_STATUS_REG) &
                       ME4000_AI_STATUS_EF_DATA) {
@@ -1026,6 +985,7 @@ static irqreturn_t me4000_ai_isr(int irq, void *dev_id)
                }
 
                /* Work is done, so reset the interrupt */
+               tmp = inl(dev->iobase + ME4000_AI_CTRL_REG);
                tmp |= ME4000_AI_CTRL_SC_IRQ_RESET;
                outl(tmp, dev->iobase + ME4000_AI_CTRL_REG);
                tmp &= ~ME4000_AI_CTRL_SC_IRQ_RESET;