From 510f5d3bd0c17a6d46393b617586907c1bb94d62 Mon Sep 17 00:00:00 2001
From: David Schleef <ds@schleef.org>
Date: Sun, 27 May 2001 23:56:55 +0000
Subject: [PATCH] Merged pcmad driver

---
 comedi/drivers/Makefile |   2 +
 comedi/drivers/pcmad.c  | 180 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 182 insertions(+)
 create mode 100644 comedi/drivers/pcmad.c

diff --git a/comedi/drivers/Makefile b/comedi/drivers/Makefile
index d8d1a53f..68f93416 100644
--- a/comedi/drivers/Makefile
+++ b/comedi/drivers/Makefile
@@ -60,6 +60,8 @@ obj-$(CONFIG_COMEDI_NI_PCIDIO)		+= ni_pcidio.o
 obj-$(CONFIG_COMEDI_MITE)		+= mite.o
 obj-$(CONFIG_COMEDI_NI_ATMIO16D)	+= ni_atmio16d.o
 
+obj-$(CONFIG_COMEDI_PCMAD)		+= pcmad.o
+
 obj-$(CONFIG_COMEDI_POC)		+= poc.o
 
 obj-$(CONFIG_COMEDI_PCL711)		+= pcl711.o
diff --git a/comedi/drivers/pcmad.c b/comedi/drivers/pcmad.c
new file mode 100644
index 00000000..21cd6ba5
--- /dev/null
+++ b/comedi/drivers/pcmad.c
@@ -0,0 +1,180 @@
+/*
+    module/pcmad
+    hardware driver for Winsystems PCM-A/D12 and PCM-A/D16
+
+    COMEDI - Linux Control and Measurement Device Interface
+    Copyright (C) 2000 David A. Schleef <ds@stm.lbl.gov>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/malloc.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/timex.h>
+#include <linux/timer.h>
+#include <asm/io.h>
+#include <comedi_module.h>
+
+
+#define PCMAD_SIZE		4
+
+#define PCMAD_STATUS		0
+#define PCMAD_LSB		1
+#define PCMAD_MSB		2
+#define PCMAD_CONVERT		1
+
+static int pcmad_attach(comedi_device *dev,comedi_devconfig *it);
+static int pcmad_detach(comedi_device *dev);
+static int pcmad_recognize(char *name);
+comedi_driver driver_pcmad={
+	driver_name:	"pcmad",
+	module:		THIS_MODULE,
+	attach:		pcmad_attach,
+	detach:		pcmad_detach,
+	recognize:	pcmad_recognize,
+};
+
+struct pcmad_board_struct{
+	char *name;
+	int n_ai_bits;
+};
+struct pcmad_board_struct pcmad_boards[]={
+	{
+	name:		"pcmad12",
+	n_ai_bits:	12,
+	},
+	{
+	name:		"pcmad16",
+	n_ai_bits:	16,
+	},
+};
+#define this_board ((struct pcmad_board_struct *)(dev->board_ptr))
+static int n_pcmad_boards=(sizeof(pcmad_boards)/sizeof(pcmad_boards[0]));
+
+struct pcmad_priv_struct{
+	int differential;
+	int twos_comp;
+};
+#define devpriv ((struct pcmad_priv_struct *)dev->private)
+
+
+#define TIMEOUT	100
+
+static int pcmad_ai_mode0(comedi_device *dev,comedi_subdevice *s,comedi_trig *it)
+{
+	int i,msb,lsb;
+	int chan;
+	int data;
+
+	chan=CR_CHAN(it->chanlist[0]);
+
+	outb(chan,dev->iobase+PCMAD_CONVERT);
+
+	for(i=0;i<TIMEOUT;i++){
+		if((inb(dev->iobase+PCMAD_STATUS)&0x3) == 0x3)
+			break;
+	}
+	lsb=inb(dev->iobase+PCMAD_LSB);
+	msb=inb(dev->iobase+PCMAD_MSB);
+
+	data=(msb<<8)|(lsb);
+
+	if(devpriv->twos_comp){
+		data ^= (1<<(this_board->n_ai_bits-1));
+	}
+	it->data[0]=data;
+	
+	return 1;
+}
+
+static int pcmad_recognize(char *name)
+{
+	int i;
+
+	for(i=0;i<n_pcmad_boards;i++){
+		if(!strcmp(pcmad_boards[i].name,name))
+			return i;
+	}
+
+	return -1;
+}
+
+/*
+ * options:
+ * 0	i/o base
+ * 1	unused
+ * 2	0=single ended 1=differential
+ * 3	0=straight binary 1=two's comp
+ */
+static int pcmad_attach(comedi_device *dev,comedi_devconfig *it)
+{
+	int ret;
+	comedi_subdevice *s;
+
+	dev->iobase=it->options[0];
+	printk("comedi%d: pcmad: 0x%04x ",dev->minor,dev->iobase);
+	if(check_region(dev->iobase,PCMAD_SIZE)<0){
+		printk("I/O port conflict\n");
+		return -EIO;
+	}
+	request_region(dev->iobase,PCMAD_SIZE,"pcmad");
+	dev->iobase=dev->iobase;
+	dev->iosize=PCMAD_SIZE;
+
+	dev->n_subdevices=1;
+	if((ret=alloc_subdevices(dev))<0)
+		return ret;
+	if((ret=alloc_private(dev,sizeof(struct pcmad_priv_struct)))<0)
+		return ret;
+
+	dev->board_ptr = pcmad_boards+dev->board;
+
+	s=dev->subdevices+0;
+	s->type=COMEDI_SUBD_AI;
+	s->subdev_flags=SDF_READABLE;
+	s->n_chan=16;			/* XXX */
+	s->len_chanlist=1;
+	s->trig[0]=pcmad_ai_mode0;
+	s->maxdata=(1<<this_board->n_ai_bits)-1;
+	s->range_table=&range_unknown;
+
+	return 0;
+}
+
+
+static int pcmad_detach(comedi_device *dev)
+{
+	printk("comedi%d: pcmad: remove\n",dev->minor);
+	
+	if(dev->irq){
+		free_irq(dev->irq,dev);
+	}
+	release_region(dev->iobase,dev->iosize);
+
+	return 0;
+}
+
+
+COMEDI_INITCLEANUP(driver_pcmad);
+
-- 
2.26.2