seeprom.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 1999-2002 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/stat.h>
#include <sys/modctl.h>
#include <sys/open.h>
#include <sys/types.h>
#include <sys/kmem.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/note.h>
#include <sys/i2c/misc/i2c_svc.h>
#include <sys/i2c/clients/seeprom_impl.h>
/*
* cb ops
*/
static int seeprom_open(dev_t *, int, int, cred_t *);
static int seeprom_close(dev_t, int, int, cred_t *);
static int seeprom_read(dev_t, struct uio *, cred_t *);
static int seeprom_write(dev_t, struct uio *, cred_t *);
static int seeprom_io(dev_t, struct uio *, int);
/*
* dev ops
*/
static int seeprom_attach(dev_info_t *dip, ddi_attach_cmd_t cmd);
static int seeprom_detach(dev_info_t *dip, ddi_detach_cmd_t cmd);
static int seeprom_info(dev_info_t *, ddi_info_cmd_t, void *, void **);
static struct cb_ops seeprom_cbops = {
seeprom_open, /* open */
seeprom_close, /* close */
nodev, /* strategy */
nodev, /* print */
nodev, /* dump */
seeprom_read, /* read */
seeprom_write, /* write */
nodev, /* ioctl */
nodev, /* devmap */
nodev, /* mmap */
nodev, /* segmap */
nochpoll, /* poll */
ddi_prop_op, /* cb_prop_op */
NULL, /* streamtab */
D_NEW | D_MP | D_HOTPLUG, /* Driver compatibility flag */
CB_REV, /* rev */
nodev, /* int (*cb_aread)() */
nodev /* int (*cb_awrite)() */
};
static struct dev_ops seeprom_ops = {
DEVO_REV,
0,
seeprom_info,
nulldev,
nulldev,
seeprom_attach,
seeprom_detach,
nodev,
&seeprom_cbops,
NULL
};
static struct modldrv seeprom_modldrv = {
&mod_driverops, /* type of module - driver */
"I2C serial EEPROM device driver v%I%",
&seeprom_ops,
};
static struct modlinkage seeprom_modlinkage = {
MODREV_1,
&seeprom_modldrv,
0
};
/*
* globals
*/
static void *seepromsoft_statep;
int
_init(void)
{
int error;
error = mod_install(&seeprom_modlinkage);
if (error == 0) {
(void) ddi_soft_state_init(&seepromsoft_statep,
sizeof (struct seepromunit), 1);
}
return (error);
}
int
_fini(void)
{
int error;
error = mod_remove(&seeprom_modlinkage);
if (error == 0) {
ddi_soft_state_fini(&seepromsoft_statep);
}
return (error);
}
int
_info(struct modinfo *modinfop)
{
return (mod_info(&seeprom_modlinkage, modinfop));
}
static int
seeprom_do_attach(dev_info_t *dip)
{
struct seepromunit *unitp;
int instance;
dev_t dev;
instance = ddi_get_instance(dip);
if (ddi_soft_state_zalloc(seepromsoft_statep, instance) != 0) {
cmn_err(CE_WARN, "%s_%d: failed to zalloc softstate",
ddi_node_name(dip), instance);
return (DDI_FAILURE);
}
unitp = ddi_get_soft_state(seepromsoft_statep, instance);
unitp->seeprom_dip = dip;
(void) snprintf(unitp->seeprom_name, sizeof (unitp->seeprom_name),
"%s%d", ddi_driver_name(dip), instance);
if (ddi_create_minor_node(dip, ddi_node_name(dip), S_IFCHR,
instance, SEEPROM_NODE_TYPE, NULL) == DDI_FAILURE) {
cmn_err(CE_WARN, "%s ddi_create_minor_node failed for '%s'",
unitp->seeprom_name, ddi_node_name(dip));
ddi_soft_state_free(seepromsoft_statep, instance);
return (DDI_FAILURE);
}
if (i2c_client_register(dip, &unitp->seeprom_hdl) != I2C_SUCCESS) {
cmn_err(CE_WARN, "i2c_client_register failed\n");
ddi_remove_minor_node(dip, NULL);
ddi_soft_state_free(seepromsoft_statep, instance);
return (DDI_FAILURE);
}
if (strcmp(ddi_binding_name(dip), "i2c-at34c02") == 0) {
unitp->seeprom_addrsize = AT34C02_ADDRSIZE;
unitp->seeprom_memsize = AT34C02_MEMSIZE;
unitp->seeprom_pagesize = AT34C02_PAGESIZE;
unitp->seeprom_pagemask = AT34C02_PAGEMASK;
} else {
/*
* Default is i2c-at24c64
*/
unitp->seeprom_addrsize = AT24C64_ADDRSIZE;
unitp->seeprom_memsize = AT24C64_MEMSIZE;
unitp->seeprom_pagesize = AT24C64_PAGESIZE;
unitp->seeprom_pagemask = AT24C64_PAGEMASK;
}
dev = makedevice(DDI_MAJOR_T_UNKNOWN, instance);
(void) ddi_prop_create(dev, dip, DDI_PROP_CANSLEEP, "size",
(caddr_t)&unitp->seeprom_memsize, sizeof (unitp->seeprom_memsize));
mutex_init(&unitp->seeprom_mutex, NULL, MUTEX_DRIVER, NULL);
cv_init(&unitp->seeprom_cv, NULL, CV_DRIVER, NULL);
return (DDI_SUCCESS);
}
static int
seeprom_attach(dev_info_t *dip, ddi_attach_cmd_t cmd)
{
switch (cmd) {
case DDI_ATTACH:
return (seeprom_do_attach(dip));
case DDI_RESUME:
/*
* No state to restore.
*/
return (DDI_SUCCESS);
default:
return (DDI_FAILURE);
}
}
static int
seeprom_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
{
_NOTE(ARGUNUSED(dip))
struct seepromunit *unitp;
switch (infocmd) {
case DDI_INFO_DEVT2DEVINFO:
unitp = ddi_get_soft_state(seepromsoft_statep,
getminor((dev_t)arg));
if (unitp == NULL) {
return (ENXIO);
}
*result = (void *)unitp->seeprom_dip;
return (DDI_SUCCESS);
case DDI_INFO_DEVT2INSTANCE:
*result = (void *)getminor((dev_t)arg);
return (DDI_SUCCESS);
default:
return (DDI_FAILURE);
}
}
static int
seeprom_do_detach(dev_info_t *dip)
{
struct seepromunit *unitp;
int instance;
instance = ddi_get_instance(dip);
unitp = ddi_get_soft_state(seepromsoft_statep, instance);
i2c_client_unregister(unitp->seeprom_hdl);
ddi_remove_minor_node(dip, NULL);
mutex_destroy(&unitp->seeprom_mutex);
cv_destroy(&unitp->seeprom_cv);
ddi_soft_state_free(seepromsoft_statep, instance);
return (DDI_SUCCESS);
}
static int
seeprom_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
{
switch (cmd) {
case DDI_DETACH:
return (seeprom_do_detach(dip));
case DDI_SUSPEND:
/*
* No state to save. IO will be blocked by nexus.
*/
return (DDI_SUCCESS);
default:
return (DDI_FAILURE);
}
}
static int
seeprom_open(dev_t *devp, int flags, int otyp, cred_t *credp)
{
_NOTE(ARGUNUSED(credp))
struct seepromunit *unitp;
int instance;
int err = 0;
if (otyp != OTYP_CHR) {
return (EINVAL);
}
instance = getminor(*devp);
unitp = (struct seepromunit *)
ddi_get_soft_state(seepromsoft_statep, instance);
if (unitp == NULL) {
return (ENXIO);
}
mutex_enter(&unitp->seeprom_mutex);
if (flags & FEXCL) {
if (unitp->seeprom_oflag != 0) {
err = EBUSY;
} else {
unitp->seeprom_oflag = FEXCL;
}
} else {
if (unitp->seeprom_oflag == FEXCL) {
err = EBUSY;
} else {
unitp->seeprom_oflag = FOPEN;
}
}
mutex_exit(&unitp->seeprom_mutex);
return (err);
}
static int
seeprom_close(dev_t dev, int flags, int otyp, cred_t *credp)
{
_NOTE(ARGUNUSED(flags, otyp, credp))
struct seepromunit *unitp;
int instance;
instance = getminor(dev);
unitp = (struct seepromunit *)
ddi_get_soft_state(seepromsoft_statep, instance);
if (unitp == NULL) {
return (ENXIO);
}
mutex_enter(&unitp->seeprom_mutex);
unitp->seeprom_oflag = 0;
mutex_exit(&unitp->seeprom_mutex);
return (DDI_SUCCESS);
}
static int
seeprom_read(dev_t dev, struct uio *uiop, cred_t *cred_p)
{
_NOTE(ARGUNUSED(cred_p))
return (seeprom_io(dev, uiop, B_READ));
}
static int
seeprom_write(dev_t dev, struct uio *uiop, cred_t *cred_p)
{
_NOTE(ARGUNUSED(cred_p))
return (seeprom_io(dev, uiop, B_WRITE));
}
static int
seeprom_io(dev_t dev, struct uio *uiop, int rw)
{
struct seepromunit *unitp;
int instance = getminor(dev);
int seeprom_addr;
int bytes_to_rw;
int err = 0;
int current_xfer_len;
int actual_data_xfer;
i2c_transfer_t *i2ctp = NULL;
unitp = (struct seepromunit *)
ddi_get_soft_state(seepromsoft_statep, instance);
if (unitp == NULL) {
return (ENXIO);
}
if (uiop->uio_offset >= unitp->seeprom_memsize) {
/*
* Exceeded seeprom size.
*/
return (ENXIO);
}
seeprom_addr = uiop->uio_offset;
if (uiop->uio_resid == 0) {
return (0);
}
bytes_to_rw = min(uiop->uio_resid,
unitp->seeprom_memsize - uiop->uio_offset);
/*
* Serialize access here to prevent a transaction starting
* until after 20 ms delay if last operation was a write.
*/
mutex_enter(&unitp->seeprom_mutex);
while ((unitp->seeprom_flags & SEEPROM_BUSY) == SEEPROM_BUSY) {
if (cv_wait_sig(&unitp->seeprom_cv,
&unitp->seeprom_mutex) <= 0) {
mutex_exit(&unitp->seeprom_mutex);
return (EINTR);
}
}
unitp->seeprom_flags |= SEEPROM_BUSY;
mutex_exit(&unitp->seeprom_mutex);
while ((bytes_to_rw != 0) && (err == 0)) {
current_xfer_len = min(bytes_to_rw, unitp->seeprom_pagesize -
(seeprom_addr & unitp->seeprom_pagemask));
if (rw == B_WRITE) {
if (i2ctp == NULL) {
(void) i2c_transfer_alloc(unitp->seeprom_hdl,
&i2ctp,
unitp->seeprom_addrsize + current_xfer_len,
0,
I2C_SLEEP);
if ((err = uiomove(&i2ctp->i2c_wbuf[
unitp->seeprom_addrsize],
current_xfer_len, UIO_WRITE, uiop)) != 0) {
i2c_transfer_free(unitp->seeprom_hdl,
i2ctp);
break;
}
i2ctp->i2c_version = I2C_XFER_REV;
i2ctp->i2c_flags = I2C_WR;
} else {
/*
* not all bytes were sent in previous attempt.
* Adjust the write pointer to the unsent data.
*/
/*LINTED*/
i2ctp->i2c_wbuf += actual_data_xfer;
/*LINTED*/
i2ctp->i2c_wlen -= actual_data_xfer;
}
if (unitp->seeprom_addrsize == 2) {
i2ctp->i2c_wbuf[0] = (seeprom_addr >> 8);
i2ctp->i2c_wbuf[1] = (uchar_t)seeprom_addr;
} else {
i2ctp->i2c_wbuf[0] = (uchar_t)seeprom_addr;
}
if ((err = i2c_transfer(unitp->seeprom_hdl, i2ctp)) !=
I2C_SUCCESS) {
i2c_transfer_free(unitp->seeprom_hdl, i2ctp);
break;
}
actual_data_xfer = i2ctp->i2c_wlen -
i2ctp->i2c_w_resid - unitp->seeprom_addrsize;
if (i2ctp->i2c_w_resid == 0) {
i2c_transfer_free(unitp->seeprom_hdl, i2ctp);
i2ctp = NULL;
}
/*
* 20 ms(20000 Microsec) delay is required before
* issuing another transaction. This enforces that
* wait.
*/
delay(drv_usectohz(20000));
} else {
/*
* SEEPROM read. First write out the address to read.
*/
(void) i2c_transfer_alloc(unitp->seeprom_hdl, &i2ctp,
unitp->seeprom_addrsize, current_xfer_len,
I2C_SLEEP);
i2ctp->i2c_version = I2C_XFER_REV;
if (unitp->seeprom_addrsize == 2) {
i2ctp->i2c_wbuf[0] = (seeprom_addr >> 8);
i2ctp->i2c_wbuf[1] = (uchar_t)seeprom_addr;
} else {
i2ctp->i2c_wbuf[0] = (uchar_t)seeprom_addr;
}
i2ctp->i2c_flags = I2C_WR_RD;
if ((err = i2c_transfer(unitp->seeprom_hdl, i2ctp)) !=
I2C_SUCCESS) {
i2c_transfer_free(unitp->seeprom_hdl, i2ctp);
break;
}
actual_data_xfer = i2ctp->i2c_rlen - i2ctp->i2c_r_resid;
err = uiomove(i2ctp->i2c_rbuf, actual_data_xfer,
UIO_READ, uiop);
i2c_transfer_free(unitp->seeprom_hdl, i2ctp);
}
bytes_to_rw -= actual_data_xfer;
seeprom_addr += actual_data_xfer;
}
mutex_enter(&unitp->seeprom_mutex);
unitp->seeprom_flags = 0;
cv_signal(&unitp->seeprom_cv);
mutex_exit(&unitp->seeprom_mutex);
return (err);
}