Initial import

1 files changed, 158 insertions, 0 deletions

diff --git a/drivers/staging/comedi/drivers/pcmad.c b/drivers/staging/comedi/drivers/pcmad.c
new file mode 100644
index 000000000..12f94fe82
--- /dev/null
+++ b/drivers/staging/comedi/drivers/pcmad.c
@@ -0,0 +1,158 @@
+/*
+ * pcmad.c
+ * Hardware driver for Winsystems PCM-A/D12 and PCM-A/D16
+ *
+ * COMEDI - Linux Control and Measurement Device Interface
+ * Copyright (C) 2000,2001 David A. Schleef <ds@schleef.org>
+ *
+ * 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.
+ */
+
+/*
+ * Driver: pcmad
+ * Description: Winsystems PCM-A/D12, PCM-A/D16
+ * Devices: [Winsystems] PCM-A/D12 (pcmad12), PCM-A/D16 (pcmad16)
+ * Author: ds
+ * Status: untested
+ *
+ * This driver was written on a bet that I couldn't write a driver
+ * in less than 2 hours.  I won the bet, but never got paid.  =(
+ *
+ * Configuration options:
+ *   [0] - I/O port base
+ *   [1] - IRQ (unused)
+ *   [2] - Analog input reference (must match jumpers)
+ *	   0 = single-ended (16 channels)
+ *	   1 = differential (8 channels)
+ *   [3] - Analog input encoding (must match jumpers)
+ *	   0 = straight binary (0-5V input range)
+ *	   1 = two's complement (+-10V input range)
+ */
+
+#include <linux/module.h>
+#include "../comedidev.h"
+
+#define PCMAD_STATUS		0
+#define PCMAD_LSB		1
+#define PCMAD_MSB		2
+#define PCMAD_CONVERT		1
+
+struct pcmad_board_struct {
+	const char *name;
+	unsigned int ai_maxdata;
+};
+
+static const struct pcmad_board_struct pcmad_boards[] = {
+	{
+		.name		= "pcmad12",
+		.ai_maxdata	= 0x0fff,
+	}, {
+		.name		= "pcmad16",
+		.ai_maxdata	= 0xffff,
+	},
+};
+
+static int pcmad_ai_eoc(struct comedi_device *dev,
+			struct comedi_subdevice *s,
+			struct comedi_insn *insn,
+			unsigned long context)
+{
+	unsigned int status;
+
+	status = inb(dev->iobase + PCMAD_STATUS);
+	if ((status & 0x3) == 0x3)
+		return 0;
+	return -EBUSY;
+}
+
+static int pcmad_ai_insn_read(struct comedi_device *dev,
+			      struct comedi_subdevice *s,
+			      struct comedi_insn *insn,
+			      unsigned int *data)
+{
+	unsigned int chan = CR_CHAN(insn->chanspec);
+	unsigned int range = CR_RANGE(insn->chanspec);
+	unsigned int val;
+	int ret;
+	int i;
+
+	for (i = 0; i < insn->n; i++) {
+		outb(chan, dev->iobase + PCMAD_CONVERT);
+
+		ret = comedi_timeout(dev, s, insn, pcmad_ai_eoc, 0);
+		if (ret)
+			return ret;
+
+		val = inb(dev->iobase + PCMAD_LSB) |
+		      (inb(dev->iobase + PCMAD_MSB) << 8);
+
+		/* data is shifted on the pcmad12, fix it */
+		if (s->maxdata == 0x0fff)
+			val >>= 4;
+
+		if (comedi_range_is_bipolar(s, range)) {
+			/* munge the two's complement value */
+			val ^= ((s->maxdata + 1) >> 1);
+		}
+
+		data[i] = val;
+	}
+
+	return insn->n;
+}
+
+static int pcmad_attach(struct comedi_device *dev, struct comedi_devconfig *it)
+{
+	const struct pcmad_board_struct *board = dev->board_ptr;
+	struct comedi_subdevice *s;
+	int ret;
+
+	ret = comedi_request_region(dev, it->options[0], 0x04);
+	if (ret)
+		return ret;
+
+	ret = comedi_alloc_subdevices(dev, 1);
+	if (ret)
+		return ret;
+
+	s = &dev->subdevices[0];
+	s->type		= COMEDI_SUBD_AI;
+	if (it->options[1]) {
+		/* 8 differential channels */
+		s->subdev_flags	= SDF_READABLE | AREF_DIFF;
+		s->n_chan	= 8;
+	} else {
+		/* 16 single-ended channels */
+		s->subdev_flags	= SDF_READABLE | AREF_GROUND;
+		s->n_chan	= 16;
+	}
+	s->len_chanlist	= 1;
+	s->maxdata	= board->ai_maxdata;
+	s->range_table	= it->options[2] ? &range_bipolar10 : &range_unipolar5;
+	s->insn_read	= pcmad_ai_insn_read;
+
+	return 0;
+}
+
+static struct comedi_driver pcmad_driver = {
+	.driver_name	= "pcmad",
+	.module		= THIS_MODULE,
+	.attach		= pcmad_attach,
+	.detach		= comedi_legacy_detach,
+	.board_name	= &pcmad_boards[0].name,
+	.num_names	= ARRAY_SIZE(pcmad_boards),
+	.offset		= sizeof(pcmad_boards[0]),
+};
+module_comedi_driver(pcmad_driver);
+
+MODULE_AUTHOR("Comedi http://www.comedi.org");
+MODULE_DESCRIPTION("Comedi low-level driver");
+MODULE_LICENSE("GPL");