[PATCH 3/3] staging: comedi: ni_daq_700: add AI subdevice
Ian Abbott
abbotti at mev.co.uk
Fri Sep 21 11:05:47 UTC 2012
Add subdevice 1 as an analog input (AI) subdevice. It currently only
supports basic, software-triggered acquisitions.
This is mostly the work of Fred Brooks (MODULE_AUTHOR), but he based his
update on an older version of the driver. I applied the relevant
changes with a few tweaks: adding an explicit `udelay(1)` in a timeout
loop, replacing binary constants with hex, renaming functions, replacing
`printk()` calls, removing exported symbols, removing (very) incomplete
comedi "command" support, and making some coding-style changes.
Signed-off-by: Ian Abbott <abbotti at mev.co.uk>
---
drivers/staging/comedi/drivers/ni_daq_700.c | 136 ++++++++++++++++++++++++++--
1 file changed, 126 insertions(+), 10 deletions(-)
diff --git a/drivers/staging/comedi/drivers/ni_daq_700.c b/drivers/staging/comedi/drivers/ni_daq_700.c
index 2318463..2ba0ade 100644
--- a/drivers/staging/comedi/drivers/ni_daq_700.c
+++ b/drivers/staging/comedi/drivers/ni_daq_700.c
@@ -1,6 +1,6 @@
/*
* comedi/drivers/ni_daq_700.c
- * Driver for DAQCard-700 DIO only
+ * Driver for DAQCard-700 DIO/AI
* copied from 8255
*
* COMEDI - Linux Control and Measurement Device Interface
@@ -29,14 +29,25 @@ Author: Fred Brooks <nsaspook at nsaspook.com>,
based on ni_daq_dio24 by Daniel Vecino Castel <dvecino at able.es>
Devices: [National Instruments] PCMCIA DAQ-Card-700 (ni_daq_700)
Status: works
-Updated: Thu, 21 Feb 2008 12:07:20 +0000
+Updated: Wed, 19 Sep 2012 12:07:20 +0000
-The daqcard-700 appears in Comedi as a single digital I/O subdevice with
-16 channels. The channel 0 corresponds to the daqcard-700's output
+The daqcard-700 appears in Comedi as a digital I/O subdevice (0) with
+16 channels and a analog input subdevice (1) with 16 single-ended channels.
+
+Digital: The channel 0 corresponds to the daqcard-700's output
port, bit 0; channel 8 corresponds to the input port, bit 0.
-Direction configuration: channels 0-7 output, 8-15 input (8225 device
+Digital direction configuration: channels 0-7 output, 8-15 input (8225 device
emu as port A output, port B input, port C N/A).
+
+Analog: The input range is 0 to 4095 for -10 to +10 volts
+IRQ is assigned but not used.
+
+Version 0.1 Original DIO only driver
+Version 0.2 DIO and basic AI analog input support on 16 se channels
+
+Manuals: Register level: http://www.ni.com/pdf/manuals/340698.pdf
+ User Manual: http://www.ni.com/pdf/manuals/320676d.pdf
*/
#include <linux/interrupt.h>
@@ -55,8 +66,21 @@ struct daq700_board {
const char *name;
};
-#define DIO_W 0x04
-#define DIO_R 0x05
+/* daqcard700 registers */
+#define DIO_W 0x04 /* WO 8bit */
+#define DIO_R 0x05 /* RO 8bit */
+#define CMD_R1 0x00 /* WO 8bit */
+#define CMD_R2 0x07 /* RW 8bit */
+#define CMD_R3 0x05 /* W0 8bit */
+#define STA_R1 0x00 /* RO 8bit */
+#define STA_R2 0x01 /* RO 8bit */
+#define ADFIFO_R 0x02 /* RO 16bit */
+#define ADCLEAR_R 0x01 /* WO 8bit */
+#define CDA_R0 0x08 /* RW 8bit */
+#define CDA_R1 0x09 /* RW 8bit */
+#define CDA_R2 0x0A /* RW 8bit */
+#define CMO_R 0x0B /* RO 8bit */
+#define TIC_R 0x06 /* WO 8bit */
static int daq700_dio_insn_bits(struct comedi_device *dev,
struct comedi_subdevice *s,
@@ -97,6 +121,87 @@ static int daq700_dio_insn_config(struct comedi_device *dev,
return insn->n;
}
+static int daq700_ai_rinsn(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn, unsigned int *data)
+{
+ int n, i, chan;
+ int d;
+ unsigned int status;
+ enum { TIMEOUT = 100 };
+
+ chan = CR_CHAN(insn->chanspec);
+ /* write channel to multiplexer */
+ /* set mask scan bit high to disable scanning */
+ outb(chan | 0x80, dev->iobase + CMD_R1);
+
+ /* convert n samples */
+ for (n = 0; n < insn->n; n++) {
+ /* trigger conversion with out0 L to H */
+ outb(0x00, dev->iobase + CMD_R2); /* enable ADC conversions */
+ outb(0x30, dev->iobase + CMO_R); /* mode 0 out0 L, from H */
+ /* mode 1 out0 H, L to H, start conversion */
+ outb(0x32, dev->iobase + CMO_R);
+ /* wait for conversion to end */
+ for (i = 0; i < TIMEOUT; i++) {
+ status = inb(dev->iobase + STA_R2);
+ if ((status & 0x03) != 0) {
+ dev_info(dev->class_dev,
+ "Overflow/run Error\n");
+ return -EOVERFLOW;
+ }
+ status = inb(dev->iobase + STA_R1);
+ if ((status & 0x02) != 0) {
+ dev_info(dev->class_dev, "Data Error\n");
+ return -ENODATA;
+ }
+ if ((status & 0x11) == 0x01) {
+ /* ADC conversion complete */
+ break;
+ }
+ udelay(1);
+ }
+ if (i == TIMEOUT) {
+ dev_info(dev->class_dev,
+ "timeout during ADC conversion\n");
+ return -ETIMEDOUT;
+ }
+ /* read data */
+ d = inw(dev->iobase + ADFIFO_R);
+ /* mangle the data as necessary */
+ /* Bipolar Offset Binary: 0 to 4095 for -10 to +10 */
+ d &= 0x0fff;
+ d ^= 0x0800;
+ data[n] = d;
+ }
+ return n;
+}
+
+/*
+ * Data acquisition is enabled.
+ * The counter 0 output is high.
+ * The I/O connector pin CLK1 drives counter 1 source.
+ * Multiple-channel scanning is disabled.
+ * All interrupts are disabled.
+ * The analog input range is set to +-10 V
+ * The analog input mode is single-ended.
+ * The analog input circuitry is initialized to channel 0.
+ * The A/D FIFO is cleared.
+ */
+static void daq700_ai_config(struct comedi_device *dev,
+ struct comedi_subdevice *s)
+{
+ unsigned long iobase = dev->iobase;
+
+ outb(0x80, iobase + CMD_R1); /* disable scanning, ADC to chan 0 */
+ outb(0x00, iobase + CMD_R2); /* clear all bits */
+ outb(0x00, iobase + CMD_R3); /* set +-10 range */
+ outb(0x32, iobase + CMO_R); /* config counter mode1, out0 to H */
+ outb(0x00, iobase + TIC_R); /* clear counter interrupt */
+ outb(0x00, iobase + ADCLEAR_R); /* clear the ADC FIFO */
+ inw(iobase + ADFIFO_R); /* read 16bit junk from FIFO to clear */
+}
+
static int daq700_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
const struct daq700_board *thisboard = comedi_board(dev);
@@ -116,7 +221,7 @@ static int daq700_attach(struct comedi_device *dev, struct comedi_devconfig *it)
dev->board_name = thisboard->name;
- ret = comedi_alloc_subdevices(dev, 1);
+ ret = comedi_alloc_subdevices(dev, 2);
if (ret)
return ret;
@@ -129,10 +234,20 @@ static int daq700_attach(struct comedi_device *dev, struct comedi_devconfig *it)
s->maxdata = 1;
s->insn_bits = daq700_dio_insn_bits;
s->insn_config = daq700_dio_insn_config;
-
s->state = 0;
s->io_bits = 0x00ff;
+ /* DAQCard-700 ai */
+ s = &dev->subdevices[1];
+ s->type = COMEDI_SUBD_AI;
+ /* we support single-ended (ground) */
+ s->subdev_flags = SDF_READABLE | SDF_GROUND;
+ s->n_chan = 16;
+ s->maxdata = (1 << 12) - 1;
+ s->range_table = &range_bipolar10;
+ s->insn_read = daq700_ai_rinsn;
+ daq700_ai_config(dev, s);
+
dev_info(dev->class_dev, "%s: %s, io 0x%lx\n",
dev->driver->driver_name,
dev->board_name,
@@ -246,5 +361,6 @@ module_exit(daq700_cs_exit);
MODULE_AUTHOR("Fred Brooks <nsaspook at nsaspook.com>");
MODULE_DESCRIPTION(
- "Comedi driver for National Instruments PCMCIA DAQCard-700 DIO");
+ "Comedi driver for National Instruments PCMCIA DAQCard-700 DIO/AI");
+MODULE_VERSION("0.2.00");
MODULE_LICENSE("GPL");
--
1.7.12
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