d17ee48907
i2c Alert Response Address. Skipping this won't hurt (the address is allegedly reserved), and it might avoid the lock-ups that have been seen by others.
271 lines
6.2 KiB
C
271 lines
6.2 KiB
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);
|