[dragonfly.git] / sys / bus / iicbus / iic.c

/*-
 * Copyright (c) 1998 Nicolas Souchu
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD: src/sys/dev/iicbus/iic.c,v 1.18 1999/11/18 05:43:32 peter Exp $
 * $DragonFly: src/sys/bus/iicbus/iic.c,v 1.10 2006/09/10 01:26:32 dillon Exp $
 *
 */
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/buf.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/fcntl.h>

#include <machine/clock.h>

#include "iiconf.h"
#include "iicbus.h"

#include <machine/iic.h>

#include "iicbus_if.h"

#define BUFSIZE 1024

struct iic_softc {

	u_char sc_addr;			/* address on iicbus */
	int sc_count;			/* >0 if device opened */

	char sc_buffer[BUFSIZE];	/* output buffer */
	char sc_inbuf[BUFSIZE];		/* input buffer */
};

#define IIC_SOFTC(unit) \
	((struct iic_softc *)devclass_get_softc(iic_devclass, (unit)))

#define IIC_DEVICE(unit) \
	(devclass_get_device(iic_devclass, (unit)))

static int iic_probe(device_t);
static int iic_attach(device_t);

static devclass_t iic_devclass;

static device_method_t iic_methods[] = {
	/* device interface */
	DEVMETHOD(device_probe,		iic_probe),
	DEVMETHOD(device_attach,	iic_attach),

	/* iicbus interface */
	DEVMETHOD(iicbus_intr,		iicbus_generic_intr),

	{ 0, 0 }
};

static driver_t iic_driver = {
	"iic",
	iic_methods,
	sizeof(struct iic_softc),
};

static	d_open_t	iicopen;
static	d_close_t	iicclose;
static	d_write_t	iicwrite;
static	d_read_t	iicread;
static	d_ioctl_t	iicioctl;

#define CDEV_MAJOR 105
static struct dev_ops iic_ops = {
	{ "iic", CDEV_MAJOR, 0 },
	.d_open =	iicopen,
	.d_close =	iicclose,
	.d_read =	iicread,
	.d_write =	iicwrite,
	.d_ioctl =	iicioctl,
};

/*
 * iicprobe()
 */
static int
iic_probe(device_t dev)
{
	struct iic_softc *sc = (struct iic_softc *)device_get_softc(dev);

	sc->sc_addr = iicbus_get_addr(dev);

	/* XXX detect chip with start/stop conditions */

	return (0);
}
	
/*
 * iicattach()
 */
static int
iic_attach(device_t dev)
{
	make_dev(&iic_ops, device_get_unit(dev),	/* XXX cleanup */
			UID_ROOT, GID_WHEEL,
			0600, "iic%d", device_get_unit(dev));
	return (0);
}

static int
iicopen (struct dev_open_args *ap)
{
	cdev_t dev = ap->a_head.a_dev;
	struct iic_softc *sc = IIC_SOFTC(minor(dev));

	if (!sc)
		return (EINVAL);

	if (sc->sc_count > 0)
		return (EBUSY);

	sc->sc_count++;

	return (0);
}

static int
iicclose(struct dev_close_args *ap)
{
	cdev_t dev = ap->a_head.a_dev;
	struct iic_softc *sc = IIC_SOFTC(minor(dev));

	if (!sc)
		return (EINVAL);

	if (!sc->sc_count)
		return (EINVAL);

	sc->sc_count--;

	if (sc->sc_count < 0)
		panic("%s: iic_count < 0!", __func__);

	return (0);
}

static int
iicwrite(struct dev_write_args *ap)
{
	cdev_t dev = ap->a_head.a_dev;
	struct uio *uio = ap->a_uio;
	device_t iicdev = IIC_DEVICE(minor(dev));
	struct iic_softc *sc = IIC_SOFTC(minor(dev));
	int sent, error, count;

	if (!sc || !iicdev)
		return (EINVAL);

	if (sc->sc_count == 0)
		return (EINVAL);

	if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
		return (error);

	count = (int)szmin(uio->uio_resid, BUFSIZE);
	uiomove(sc->sc_buffer, (size_t)count, uio);

	error = iicbus_block_write(device_get_parent(iicdev), sc->sc_addr,
					sc->sc_buffer, count, &sent);

	iicbus_release_bus(device_get_parent(iicdev), iicdev);

	return(error);
}

static int
iicread(struct dev_read_args *ap)
{
	cdev_t dev = ap->a_head.a_dev;
	struct uio *uio = ap->a_uio;
	device_t iicdev = IIC_DEVICE(minor(dev));
	struct iic_softc *sc = IIC_SOFTC(minor(dev));
	int len, error = 0;
	int bufsize;

	if (!sc || !iicdev)
		return (EINVAL);

	if (sc->sc_count == 0)
		return (EINVAL);

	if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
		return (error);

	/* max amount of data to read */
	len = (int)szmin(uio->uio_resid, BUFSIZE);

	if ((error = iicbus_block_read(device_get_parent(iicdev), sc->sc_addr,
					sc->sc_inbuf, len, &bufsize)))
		return (error);

	if (bufsize > uio->uio_resid)
		panic("%s: too much data read!", __func__);

	iicbus_release_bus(device_get_parent(iicdev), iicdev);

	return (uiomove(sc->sc_inbuf, (size_t)bufsize, uio));
}

static int
iicioctl(struct dev_ioctl_args *ap)
{
	cdev_t dev = ap->a_head.a_dev;
	device_t iicdev = IIC_DEVICE(minor(dev));
	struct iic_softc *sc = IIC_SOFTC(minor(dev));
	device_t parent = device_get_parent(iicdev);
	struct iiccmd *s = (struct iiccmd *)ap->a_data;
	int error, count;

	if (!sc)
		return (EINVAL);

	if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev,
			(ap->a_fflag & O_NONBLOCK) ? IIC_DONTWAIT :
						(IIC_WAIT | IIC_INTR))))
		return (error);

	switch (ap->a_cmd) {
	case I2CSTART:
		error = iicbus_start(parent, s->slave, 0);
		break;

	case I2CSTOP:
		error = iicbus_stop(parent);
		break;

	case I2CRSTCARD:
		error = iicbus_reset(parent, 0, 0, NULL);
		break;

	case I2CWRITE:
		error = iicbus_write(parent, s->buf, s->count, &count, 0);
		break;

	case I2CREAD:
		error = iicbus_read(parent, s->buf, s->count, &count, s->last, 0);
		break;

	default:
		error = ENODEV;
	}

	iicbus_release_bus(device_get_parent(iicdev), iicdev);

	return (error);
}

DRIVER_MODULE(iic, iicbus, iic_driver, iic_devclass, 0, 0);
Commit	Line	Data
984263bc MD	1	/*-
	2	* Copyright (c) 1998 Nicolas Souchu
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	*
	14	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
	15	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	16	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	17	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	18	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	19	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	20	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	21	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	22	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	23	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	24	* SUCH DAMAGE.
	25	*
	26	* $FreeBSD: src/sys/dev/iicbus/iic.c,v 1.18 1999/11/18 05:43:32 peter Exp $
b13267a5	27	* $DragonFly: src/sys/bus/iicbus/iic.c,v 1.10 2006/09/10 01:26:32 dillon Exp $
984263bc MD	28	*
	29	*/
	30	#include <sys/param.h>
	31	#include <sys/kernel.h>
	32	#include <sys/systm.h>
	33	#include <sys/module.h>
	34	#include <sys/bus.h>
	35	#include <sys/conf.h>
	36	#include <sys/buf.h>
	37	#include <sys/uio.h>
	38	#include <sys/malloc.h>
	39	#include <sys/fcntl.h>
	40
	41	#include <machine/clock.h>
	42
1f2de5d4 MD	43	#include "iiconf.h"
1f2de5d4 MD	44	#include "iicbus.h"
984263bc MD	45
	46	#include <machine/iic.h>
	47
	48	#include "iicbus_if.h"
	49
	50	#define BUFSIZE 1024
	51
	52	struct iic_softc {
	53
	54	u_char sc_addr; /* address on iicbus */
	55	int sc_count; /* >0 if device opened */
	56
	57	char sc_buffer[BUFSIZE]; /* output buffer */
	58	char sc_inbuf[BUFSIZE]; /* input buffer */
	59	};
	60
	61	#define IIC_SOFTC(unit) \
	62	((struct iic_softc *)devclass_get_softc(iic_devclass, (unit)))
	63
	64	#define IIC_DEVICE(unit) \
	65	(devclass_get_device(iic_devclass, (unit)))
	66
	67	static int iic_probe(device_t);
	68	static int iic_attach(device_t);
	69
	70	static devclass_t iic_devclass;
	71
	72	static device_method_t iic_methods[] = {
	73	/* device interface */
	74	DEVMETHOD(device_probe, iic_probe),
	75	DEVMETHOD(device_attach, iic_attach),
	76
	77	/* iicbus interface */
	78	DEVMETHOD(iicbus_intr, iicbus_generic_intr),
	79
	80	{ 0, 0 }
	81	};
	82
	83	static driver_t iic_driver = {
	84	"iic",
	85	iic_methods,
	86	sizeof(struct iic_softc),
	87	};
	88
	89	static d_open_t iicopen;
	90	static d_close_t iicclose;
	91	static d_write_t iicwrite;
	92	static d_read_t iicread;
	93	static d_ioctl_t iicioctl;
	94
	95	#define CDEV_MAJOR 105
fef8985e MD	96	static struct dev_ops iic_ops = {
	97	{ "iic", CDEV_MAJOR, 0 },
	98	.d_open = iicopen,
	99	.d_close = iicclose,
	100	.d_read = iicread,
	101	.d_write = iicwrite,
	102	.d_ioctl = iicioctl,
984263bc MD	103	};
	104
	105	/*
	106	* iicprobe()
	107	*/
	108	static int
	109	iic_probe(device_t dev)
	110	{
	111	struct iic_softc sc = (struct iic_softc )device_get_softc(dev);
	112
	113	sc->sc_addr = iicbus_get_addr(dev);
	114
	115	/* XXX detect chip with start/stop conditions */
	116
	117	return (0);
	118	}
	119
	120	/*
	121	* iicattach()
	122	*/
	123	static int
	124	iic_attach(device_t dev)
	125	{
fef8985e	126	make_dev(&iic_ops, device_get_unit(dev), /* XXX cleanup */
984263bc MD	127	UID_ROOT, GID_WHEEL,
	128	0600, "iic%d", device_get_unit(dev));
	129	return (0);
	130	}
	131
	132	static int
fef8985e	133	iicopen (struct dev_open_args *ap)
984263bc	134	{
b13267a5	135	cdev_t dev = ap->a_head.a_dev;
984263bc MD	136	struct iic_softc *sc = IIC_SOFTC(minor(dev));
	137
	138	if (!sc)
	139	return (EINVAL);
	140
	141	if (sc->sc_count > 0)
	142	return (EBUSY);
	143
	144	sc->sc_count++;
	145
	146	return (0);
	147	}
	148
	149	static int
fef8985e	150	iicclose(struct dev_close_args *ap)
984263bc	151	{
b13267a5	152	cdev_t dev = ap->a_head.a_dev;
984263bc MD	153	struct iic_softc *sc = IIC_SOFTC(minor(dev));
	154
	155	if (!sc)
	156	return (EINVAL);
	157
	158	if (!sc->sc_count)
	159	return (EINVAL);
	160
	161	sc->sc_count--;
	162
	163	if (sc->sc_count < 0)
5e2195bf	164	panic("%s: iic_count < 0!", __func__);
984263bc MD	165
	166	return (0);
	167	}
	168
	169	static int
fef8985e	170	iicwrite(struct dev_write_args *ap)
984263bc	171	{
b13267a5	172	cdev_t dev = ap->a_head.a_dev;
fef8985e	173	struct uio *uio = ap->a_uio;
984263bc MD	174	device_t iicdev = IIC_DEVICE(minor(dev));
	175	struct iic_softc *sc = IIC_SOFTC(minor(dev));
	176	int sent, error, count;
	177
	178	if (!sc \|\| !iicdev)
	179	return (EINVAL);
	180
	181	if (sc->sc_count == 0)
	182	return (EINVAL);
	183
	184	if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
	185	return (error);
	186
e54488bb MD	187	count = (int)szmin(uio->uio_resid, BUFSIZE);
e54488bb MD	188	uiomove(sc->sc_buffer, (size_t)count, uio);
984263bc MD	189
	190	error = iicbus_block_write(device_get_parent(iicdev), sc->sc_addr,
	191	sc->sc_buffer, count, &sent);
	192
	193	iicbus_release_bus(device_get_parent(iicdev), iicdev);
	194
	195	return(error);
	196	}
	197
	198	static int
fef8985e	199	iicread(struct dev_read_args *ap)
984263bc	200	{
b13267a5	201	cdev_t dev = ap->a_head.a_dev;
fef8985e	202	struct uio *uio = ap->a_uio;
984263bc MD	203	device_t iicdev = IIC_DEVICE(minor(dev));
	204	struct iic_softc *sc = IIC_SOFTC(minor(dev));
	205	int len, error = 0;
	206	int bufsize;
	207
	208	if (!sc \|\| !iicdev)
	209	return (EINVAL);
	210
	211	if (sc->sc_count == 0)
	212	return (EINVAL);
	213
	214	if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
	215	return (error);
	216
	217	/* max amount of data to read */
e54488bb	218	len = (int)szmin(uio->uio_resid, BUFSIZE);
984263bc MD	219
	220	if ((error = iicbus_block_read(device_get_parent(iicdev), sc->sc_addr,
	221	sc->sc_inbuf, len, &bufsize)))
	222	return (error);
	223
	224	if (bufsize > uio->uio_resid)
5e2195bf	225	panic("%s: too much data read!", __func__);
984263bc MD	226
	227	iicbus_release_bus(device_get_parent(iicdev), iicdev);
	228
e54488bb	229	return (uiomove(sc->sc_inbuf, (size_t)bufsize, uio));
984263bc MD	230	}
	231
	232	static int
fef8985e	233	iicioctl(struct dev_ioctl_args *ap)
984263bc	234	{
b13267a5	235	cdev_t dev = ap->a_head.a_dev;
984263bc MD	236	device_t iicdev = IIC_DEVICE(minor(dev));
	237	struct iic_softc *sc = IIC_SOFTC(minor(dev));
	238	device_t parent = device_get_parent(iicdev);
fef8985e	239	struct iiccmd s = (struct iiccmd )ap->a_data;
984263bc MD	240	int error, count;
	241
	242	if (!sc)
	243	return (EINVAL);
	244
	245	if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev,
fef8985e	246	(ap->a_fflag & O_NONBLOCK) ? IIC_DONTWAIT :
984263bc MD	247	(IIC_WAIT \| IIC_INTR))))
	248	return (error);
	249
fef8985e	250	switch (ap->a_cmd) {
984263bc MD	251	case I2CSTART:
	252	error = iicbus_start(parent, s->slave, 0);
	253	break;
	254
	255	case I2CSTOP:
	256	error = iicbus_stop(parent);
	257	break;
	258
	259	case I2CRSTCARD:
	260	error = iicbus_reset(parent, 0, 0, NULL);
	261	break;
	262
	263	case I2CWRITE:
	264	error = iicbus_write(parent, s->buf, s->count, &count, 0);
	265	break;
	266
	267	case I2CREAD:
	268	error = iicbus_read(parent, s->buf, s->count, &count, s->last, 0);
	269	break;
	270
	271	default:
	272	error = ENODEV;
	273	}
	274
	275	iicbus_release_bus(device_get_parent(iicdev), iicdev);
	276
	277	return (error);
	278	}
	279
	280	DRIVER_MODULE(iic, iicbus, iic_driver, iic_devclass, 0, 0);