1 files changed, 165 insertions, 0 deletions
diff --git a/drivers/comedi/drivers/pcmda12.c b/drivers/comedi/drivers/pcmda12.c
new file mode 100644
index 000000000..611f13bed
--- /dev/null
+++ b/drivers/comedi/drivers/pcmda12.c
@@ -0,0 +1,165 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * pcmda12.c
+ * Driver for Winsystems PC-104 based PCM-D/A-12 8-channel AO board.
+ *
+ * COMEDI - Linux Control and Measurement Device Interface
+ * Copyright (C) 2006 Calin A. Culianu <calin@ajvar.org>
+ */
+
+/*
+ * Driver: pcmda12
+ * Description: A driver for the Winsystems PCM-D/A-12
+ * Devices: [Winsystems] PCM-D/A-12 (pcmda12)
+ * Author: Calin Culianu <calin@ajvar.org>
+ * Updated: Fri, 13 Jan 2006 12:01:01 -0500
+ * Status: works
+ *
+ * A driver for the relatively straightforward-to-program PCM-D/A-12.
+ * This board doesn't support commands, and the only way to set its
+ * analog output range is to jumper the board. As such,
+ * comedi_data_write() ignores the range value specified.
+ *
+ * The board uses 16 consecutive I/O addresses starting at the I/O port
+ * base address. Each address corresponds to the LSB then MSB of a
+ * particular channel from 0-7.
+ *
+ * Note that the board is not ISA-PNP capable and thus needs the I/O
+ * port comedi_config parameter.
+ *
+ * Note that passing a nonzero value as the second config option will
+ * enable "simultaneous xfer" mode for this board, in which AO writes
+ * will not take effect until a subsequent read of any AO channel. This
+ * is so that one can speed up programming by preloading all AO registers
+ * with values before simultaneously setting them to take effect with one
+ * read command.
+ *
+ * Configuration Options:
+ *   [0] - I/O port base address
+ *   [1] - Do Simultaneous Xfer (see description)
+ */
+
+#include <linux/module.h>
+#include <linux/comedi/comedidev.h>
+
+/* AI range is not configurable, it's set by jumpers on the board */
+static const struct comedi_lrange pcmda12_ranges = {
+	3, {
+		UNI_RANGE(5),
+		UNI_RANGE(10),
+		BIP_RANGE(5)
+	}
+};
+
+struct pcmda12_private {
+	int simultaneous_xfer_mode;
+};
+
+static int pcmda12_ao_insn_write(struct comedi_device *dev,
+				 struct comedi_subdevice *s,
+				 struct comedi_insn *insn,
+				 unsigned int *data)
+{
+	struct pcmda12_private *devpriv = dev->private;
+	unsigned int chan = CR_CHAN(insn->chanspec);
+	unsigned int val = s->readback[chan];
+	unsigned long ioreg = dev->iobase + (chan * 2);
+	int i;
+
+	for (i = 0; i < insn->n; ++i) {
+		val = data[i];
+		outb(val & 0xff, ioreg);
+		outb((val >> 8) & 0xff, ioreg + 1);
+
+		/*
+		 * Initiate transfer if not in simultaneaous xfer
+		 * mode by reading one of the AO registers.
+		 */
+		if (!devpriv->simultaneous_xfer_mode)
+			inb(ioreg);
+	}
+	s->readback[chan] = val;
+
+	return insn->n;
+}
+
+static int pcmda12_ao_insn_read(struct comedi_device *dev,
+				struct comedi_subdevice *s,
+				struct comedi_insn *insn,
+				unsigned int *data)
+{
+	struct pcmda12_private *devpriv = dev->private;
+
+	/*
+	 * Initiate simultaneaous xfer mode by reading one of the
+	 * AO registers. All analog outputs will then be updated.
+	 */
+	if (devpriv->simultaneous_xfer_mode)
+		inb(dev->iobase);
+
+	return comedi_readback_insn_read(dev, s, insn, data);
+}
+
+static void pcmda12_ao_reset(struct comedi_device *dev,
+			     struct comedi_subdevice *s)
+{
+	int i;
+
+	for (i = 0; i < s->n_chan; ++i) {
+		outb(0, dev->iobase + (i * 2));
+		outb(0, dev->iobase + (i * 2) + 1);
+	}
+	/* Initiate transfer by reading one of the AO registers. */
+	inb(dev->iobase);
+}
+
+static int pcmda12_attach(struct comedi_device *dev,
+			  struct comedi_devconfig *it)
+{
+	struct pcmda12_private *devpriv;
+	struct comedi_subdevice *s;
+	int ret;
+
+	ret = comedi_request_region(dev, it->options[0], 0x10);
+	if (ret)
+		return ret;
+
+	devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
+	if (!devpriv)
+		return -ENOMEM;
+
+	devpriv->simultaneous_xfer_mode = it->options[1];
+
+	ret = comedi_alloc_subdevices(dev, 1);
+	if (ret)
+		return ret;
+
+	s = &dev->subdevices[0];
+	s->type		= COMEDI_SUBD_AO;
+	s->subdev_flags	= SDF_READABLE | SDF_WRITABLE;
+	s->n_chan	= 8;
+	s->maxdata	= 0x0fff;
+	s->range_table	= &pcmda12_ranges;
+	s->insn_write	= pcmda12_ao_insn_write;
+	s->insn_read	= pcmda12_ao_insn_read;
+
+	ret = comedi_alloc_subdev_readback(s);
+	if (ret)
+		return ret;
+
+	pcmda12_ao_reset(dev, s);
+
+	return 0;
+}
+
+static struct comedi_driver pcmda12_driver = {
+	.driver_name	= "pcmda12",
+	.module		= THIS_MODULE,
+	.attach		= pcmda12_attach,
+	.detach		= comedi_legacy_detach,
+};
+module_comedi_driver(pcmda12_driver);
+
+MODULE_AUTHOR("Comedi https://www.comedi.org");
+MODULE_DESCRIPTION("Comedi low-level driver");
+MODULE_LICENSE("GPL");