NetBSD-5.0.2/sys/dev/i2c/i2c.c
/* $NetBSD: i2c.c,v 1.22 2008/09/29 22:55:08 pgoyette Exp $ */
/*
* Copyright (c) 2003 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Jason R. Thorpe for Wasabi Systems, Inc.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
* 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: i2c.c,v 1.22 2008/09/29 22:55:08 pgoyette Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/event.h>
#include <sys/conf.h>
#include <sys/malloc.h>
#include <sys/kthread.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <dev/i2c/i2cvar.h>
#include "locators.h"
#include <opt_i2cbus.h>
struct iic_softc {
i2c_tag_t sc_tag;
int sc_type;
};
static void iic_smbus_intr_thread(void *);
int
iicbus_print(void *aux, const char *pnp)
{
if (pnp != NULL)
aprint_normal("iic at %s", pnp);
return (UNCONF);
}
static int
iic_print(void *aux, const char *pnp)
{
struct i2c_attach_args *ia = aux;
if (ia->ia_addr != (i2c_addr_t)-1)
aprint_normal(" addr 0x%x", ia->ia_addr);
return (UNCONF);
}
static int
iic_search(device_t parent, cfdata_t cf, const int *ldesc, void *aux)
{
struct iic_softc *sc = device_private(parent);
struct i2c_attach_args ia;
ia.ia_tag = sc->sc_tag;
ia.ia_addr = cf->cf_loc[IICCF_ADDR];
ia.ia_size = cf->cf_loc[IICCF_SIZE];
ia.ia_type = sc->sc_type;
if (config_match(parent, cf, &ia) > 0)
config_attach(parent, cf, &ia, iic_print);
return (0);
}
static int
iic_match(device_t parent, cfdata_t cf, void *aux)
{
return (1);
}
static void
iic_attach(device_t parent, device_t self, void *aux)
{
struct iic_softc *sc = device_private(self);
struct i2cbus_attach_args *iba = aux;
i2c_tag_t ic;
int rv;
aprint_naive(": I2C bus\n");
aprint_normal(": I2C bus\n");
sc->sc_tag = iba->iba_tag;
sc->sc_type = iba->iba_type;
ic = sc->sc_tag;
ic->ic_devname = device_xname(self);
LIST_INIT(&(sc->sc_tag->ic_list));
LIST_INIT(&(sc->sc_tag->ic_proc_list));
rv = kthread_create(PRI_NONE, 0, NULL, iic_smbus_intr_thread,
ic, &ic->ic_intr_thread, "%s", ic->ic_devname);
if (rv)
aprint_error_dev(self, "unable to create intr thread\n");
#if I2C_SCAN
if (sc->sc_type == I2C_TYPE_SMBUS) {
int found = 0;
i2c_addr_t addr;
uint8_t cmd = 0, val;
for (addr = 0x0; addr < 0x80; addr++) {
/* Skip i2c Alert Response Address */
if (addr == 0x0c)
continue;
iic_acquire_bus(ic, 0);
if (iic_exec(ic, I2C_OP_READ_WITH_STOP, addr,
&cmd, 1, &val, 1, 0) == 0) {
if (found == 0)
aprint_normal("%s: devices at",
ic->ic_devname);
found++;
aprint_normal(" 0x%02x", addr);
}
iic_release_bus(ic, 0);
}
if (found == 0)
aprint_normal("%s: no devices found", ic->ic_devname);
aprint_normal("\n");
}
#endif
if (!pmf_device_register(self, NULL, NULL))
aprint_error_dev(self, "couldn't establish power handler\n");
/*
* Attach all i2c devices described in the kernel
* configuration file.
*/
config_search_ia(iic_search, self, "iic", NULL);
}
static void
iic_smbus_intr_thread(void *aux)
{
i2c_tag_t ic;
struct ic_intr_list *il;
int rv;
ic = (i2c_tag_t)aux;
ic->ic_running = 1;
ic->ic_pending = 0;
while (ic->ic_running) {
if (ic->ic_pending == 0)
rv = tsleep(ic, PZERO, "iicintr", hz);
if (ic->ic_pending > 0) {
LIST_FOREACH(il, &(ic->ic_proc_list), il_next) {
(*il->il_intr)(il->il_intrarg);
}
ic->ic_pending--;
}
}
kthread_exit(0);
}
void *
iic_smbus_intr_establish(i2c_tag_t ic, int (*intr)(void *), void *intrarg)
{
struct ic_intr_list *il;
il = malloc(sizeof(struct ic_intr_list), M_DEVBUF, M_WAITOK);
if (il == NULL)
return NULL;
il->il_intr = intr;
il->il_intrarg = intrarg;
LIST_INSERT_HEAD(&(ic->ic_list), il, il_next);
return il;
}
void
iic_smbus_intr_disestablish(i2c_tag_t ic, void *hdl)
{
struct ic_intr_list *il;
il = (struct ic_intr_list *)hdl;
LIST_REMOVE(il, il_next);
free(il, M_DEVBUF);
return;
}
void *
iic_smbus_intr_establish_proc(i2c_tag_t ic, int (*intr)(void *), void *intrarg)
{
struct ic_intr_list *il;
il = malloc(sizeof(struct ic_intr_list), M_DEVBUF, M_WAITOK);
if (il == NULL)
return NULL;
il->il_intr = intr;
il->il_intrarg = intrarg;
LIST_INSERT_HEAD(&(ic->ic_proc_list), il, il_next);
return il;
}
void
iic_smbus_intr_disestablish_proc(i2c_tag_t ic, void *hdl)
{
struct ic_intr_list *il;
il = (struct ic_intr_list *)hdl;
LIST_REMOVE(il, il_next);
free(il, M_DEVBUF);
return;
}
int
iic_smbus_intr(i2c_tag_t ic)
{
struct ic_intr_list *il;
LIST_FOREACH(il, &(ic->ic_list), il_next) {
(*il->il_intr)(il->il_intrarg);
}
ic->ic_pending++;
wakeup(ic);
return 1;
}
CFATTACH_DECL_NEW(iic, sizeof(struct iic_softc),
iic_match, iic_attach, NULL, NULL);