Staging: comedi: add fl212 driver

/*

    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;

}