Staging: comedi: add fl212 driver

Driver for FL512 board

From: Anders Gnistrup <ex18@kalman.iau.dtu.dk>
Cc: David Schleef <ds@schleef.org>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/comedi/drivers/fl512.c

+/*
+    comedi/drivers/fl512.c
+    Anders Gnistrup <ex18@kalman.iau.dtu.dk>
+*/
+
+/*
+Driver: fl512
+Description: unknown
+Author: Anders Gnistrup <ex18@kalman.iau.dtu.dk>
+Devices: [unknown] FL512 (fl512)
+Status: unknown
+
+Digital I/O is not supported.
+
+Configuration options:
+  [0] - I/O port base address
+*/
+
+#define DEBUG 0
+
+#include "../comedidev.h"
+
+#include <linux/delay.h>
+#include <linux/ioport.h>
+
+#define FL512_SIZE 16		/* the size of the used memory */
+typedef struct {
+	sampl_t ao_readback[2];
+} fl512_private;
+#define devpriv ((fl512_private *) dev->private)
+
+static const comedi_lrange range_fl512 = { 4, {
+			BIP_RANGE(0.5),
+			BIP_RANGE(1),
+			BIP_RANGE(5),
+			BIP_RANGE(10),
+			UNI_RANGE(1),
+			UNI_RANGE(5),
+			UNI_RANGE(10),
+	}
+};
+
+static int fl512_attach(comedi_device * dev, comedi_devconfig * it);
+static int fl512_detach(comedi_device * dev);
+
+static comedi_driver driver_fl512 = {
+      driver_name:"fl512",
+      module:THIS_MODULE,
+      attach:fl512_attach,
+      detach:fl512_detach,
+};
+
+COMEDI_INITCLEANUP(driver_fl512);
+
+static int fl512_ai_insn(comedi_device * dev,
+	comedi_subdevice * s, comedi_insn * insn, lsampl_t * data);
+static int fl512_ao_insn(comedi_device * dev,
+	comedi_subdevice * s, comedi_insn * insn, lsampl_t * data);
+static int fl512_ao_insn_readback(comedi_device * dev,
+	comedi_subdevice * s, comedi_insn * insn, lsampl_t * data);
+
+/*
+ * fl512_ai_insn : this is the analog input function
+ */
+static int fl512_ai_insn(comedi_device * dev,
+	comedi_subdevice * s, comedi_insn * insn, lsampl_t * data)
+{
+	int n;
+	unsigned int lo_byte, hi_byte;
+	char chan = CR_CHAN(insn->chanspec);
+	unsigned long iobase = dev->iobase;
+
+	for (n = 0; n < insn->n; n++) {	/* sample n times on selected channel */
+		/* XXX probably can move next step out of for() loop -- will make
+		 * AI a little bit faster. */
+		outb(chan, iobase + 2);	/* select chan */
+		outb(0, iobase + 3);	/* start conversion */
+		/* XXX should test "done" flag instead of delay */
+		comedi_udelay(30);	/* sleep 30 usec */
+		lo_byte = inb(iobase + 2);	/* low 8 byte */
+		hi_byte = inb(iobase + 3) & 0xf;	/* high 4 bit and mask */
+		data[n] = lo_byte + (hi_byte << 8);
+	}
+	return n;
+}
+
+/*
+ * fl512_ao_insn : used to write to a DA port n times
+ */
+static int fl512_ao_insn(comedi_device * dev,
+	comedi_subdevice * s, comedi_insn * insn, lsampl_t * data)
+{
+	int n;
+	int chan = CR_CHAN(insn->chanspec);	/* get chan to write */
+	unsigned long iobase = dev->iobase;	/* get base address  */
+
+	for (n = 0; n < insn->n; n++) {	/* write n data set */
+		outb(data[n] & 0x0ff, iobase + 4 + 2 * chan);	/* write low byte   */
+		outb((data[n] & 0xf00) >> 8, iobase + 4 + 2 * chan);	/* write high byte  */
+		inb(iobase + 4 + 2 * chan);	/* trig */
+
+		devpriv->ao_readback[chan] = data[n];
+	}
+	return n;
+}
+
+/*
+ * fl512_ao_insn_readback : used to read previous values written to
+ * DA port
+ */
+static int fl512_ao_insn_readback(comedi_device * dev,
+	comedi_subdevice * s, comedi_insn * insn, lsampl_t * data)
+{
+	int n;
+	int chan = CR_CHAN(insn->chanspec);
+
+	for (n = 0; n < insn->n; n++) {
+		data[n] = devpriv->ao_readback[chan];
+	}
+
+	return n;
+}
+
+/*
+ * start attach
+ */
+static int fl512_attach(comedi_device * dev, comedi_devconfig * it)
+{
+	unsigned long iobase;
+	comedi_subdevice *s;	/* pointer to the subdevice:
+				   Analog in, Analog out, ( not made ->and Digital IO) */
+
+	iobase = it->options[0];
+	printk("comedi:%d fl512: 0x%04lx", dev->minor, iobase);
+	if (!request_region(iobase, FL512_SIZE, "fl512")) {
+		printk(" I/O port conflict\n");
+		return -EIO;
+	}
+	dev->iobase = iobase;
+	dev->board_name = "fl512";
+	if (alloc_private(dev, sizeof(fl512_private)) < 0)
+		return -ENOMEM;
+
+#if DEBUG
+	printk("malloc ok\n");
+#endif
+
+	if (alloc_subdevices(dev, 2) < 0)
+		return -ENOMEM;
+
+	/*
+	 * this if the definitions of the supdevices, 2 have been defined
+	 */
+	/* Analog indput */
+	s = dev->subdevices + 0;
+	s->type = COMEDI_SUBD_AI;	/* define subdevice as Analog In   */
+	s->subdev_flags = SDF_READABLE | SDF_GROUND;	/* you can read it from userspace  */
+	s->n_chan = 16;		/* Number of Analog input channels */
+	s->maxdata = 0x0fff;	/* accept only 12 bits of data     */
+	s->range_table = &range_fl512;	/* device use one of the ranges    */
+	s->insn_read = fl512_ai_insn;	/* function to call when read AD   */
+	printk("comedi: fl512: subdevice 0 initialized\n");
+
+	/* Analog output */
+	s = dev->subdevices + 1;
+	s->type = COMEDI_SUBD_AO;	/* define subdevice as Analog OUT   */
+	s->subdev_flags = SDF_WRITABLE;	/* you can write it from userspace  */
+	s->n_chan = 2;		/* Number of Analog output channels */
+	s->maxdata = 0x0fff;	/* accept only 12 bits of data      */
+	s->range_table = &range_fl512;	/* device use one of the ranges     */
+	s->insn_write = fl512_ao_insn;	/* function to call when write DA   */
+	s->insn_read = fl512_ao_insn_readback;	/* function to call when reading DA   */
+	printk("comedi: fl512: subdevice 1 initialized\n");
+
+	return 1;
+}
+
+static int fl512_detach(comedi_device * dev)
+{
+	if (dev->iobase)
+		release_region(dev->iobase, FL512_SIZE);
+	printk("comedi%d: fl512: dummy i detach\n", dev->minor);
+	return 0;
+}