i2c/clients/ltc1427.c

	ltc1427.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 (c) 2000-2001 by Sun Microsystems, Inc.
 * All rights reserved.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"


#include <sys/stat.h>       /* ddi_create_minor_node S_IFCHR */
#include <sys/modctl.h>     /* for modldrv */
#include <sys/open.h>       /* for open params.  */
#include <sys/types.h>
#include <sys/kmem.h>
#include <sys/sunddi.h>
#include <sys/conf.h>       /* req. by dev_ops flags MTSAFE etc. */
#include <sys/ddi.h>
#include <sys/file.h>
#include <sys/note.h>

#include <sys/i2c/clients/ltc1427_impl.h>

static void *ltc1427soft_statep;


static int ltc1427_do_attach(dev_info_t *);
static int ltc1427_do_detach(dev_info_t *);
static int ltc1427_do_resume(void);
static int ltc1427_do_suspend(void);

/*
 * cb ops (only need ioctl)
 */
static int ltc1427_open(dev_t *, int, int, cred_t *);
static int ltc1427_close(dev_t, int, int, cred_t *);
static int ltc1427_ioctl(dev_t, int, intptr_t, int, cred_t *, int *);

static struct cb_ops ltc1427_cbops = {
    ltc1427_open,           /* open  */
    ltc1427_close,          /* close */
    nodev,              /* strategy */
    nodev,              /* print */
    nodev,              /* dump */
    nodev,              /* read */
    nodev,              /* write */
    ltc1427_ioctl,          /* 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)() */
};

/*
 * dev ops
 */
static int ltc1427_attach(dev_info_t *dip, ddi_attach_cmd_t cmd);
static int ltc1427_detach(dev_info_t *dip, ddi_detach_cmd_t cmd);

static struct dev_ops ltc1427_ops = {
    DEVO_REV,
    0,
    ddi_getinfo_1to1,
    nulldev,
    nulldev,
    ltc1427_attach,
    ltc1427_detach,
    nodev,
    &ltc1427_cbops,
    NULL
};

extern struct mod_ops mod_driverops;

static struct modldrv ltc1427_modldrv = {
    &mod_driverops,         /* type of module - driver */
    "LTC1427 i2c device driver: v%I%",
    &ltc1427_ops
};

static struct modlinkage ltc1427_modlinkage = {
    MODREV_1,
    &ltc1427_modldrv,
    0
};


int
_init(void)
{
    int error;

    error = mod_install(&ltc1427_modlinkage);

    if (!error)
        (void) ddi_soft_state_init(&ltc1427soft_statep,
            sizeof (struct ltc1427_unit), 1);
    return (error);
}

int
_fini(void)
{
    int error;

    error = mod_remove(&ltc1427_modlinkage);
    if (!error)
        ddi_soft_state_fini(&ltc1427soft_statep);

    return (error);
}

int
_info(struct modinfo *modinfop)
{
    return (mod_info(&ltc1427_modlinkage, modinfop));
}

static int
ltc1427_open(dev_t *devp, int flags, int otyp, cred_t *credp)
{
    _NOTE(ARGUNUSED(credp))

    struct ltc1427_unit *unitp;
    int instance;
    int error = 0;

    instance = getminor(*devp);

    if (instance < 0) {
        return (ENXIO);
    }

    unitp = (struct ltc1427_unit *)
        ddi_get_soft_state(ltc1427soft_statep, instance);

    if (unitp == NULL) {
        return (ENXIO);
    }

    if (otyp != OTYP_CHR) {
        return (EINVAL);
    }

    mutex_enter(&unitp->ltc1427_mutex);

    if (flags & FEXCL) {
        if (unitp->ltc1427_oflag != 0) {
            error = EBUSY;
        } else {
            unitp->ltc1427_oflag = FEXCL;
        }
    } else {
        if (unitp->ltc1427_oflag == FEXCL) {
            error = EBUSY;
        } else {
            unitp->ltc1427_oflag = FOPEN;
        }
    }

    mutex_exit(&unitp->ltc1427_mutex);

    return (error);
}

static int
ltc1427_close(dev_t dev, int flags, int otyp, cred_t *credp)
{
    _NOTE(ARGUNUSED(flags, otyp, credp))

    struct ltc1427_unit *unitp;
    int instance;

    instance = getminor(dev);

    if (instance < 0) {
        return (ENXIO);
    }

    unitp = (struct ltc1427_unit *)
        ddi_get_soft_state(ltc1427soft_statep, instance);

    if (unitp == NULL) {
        return (ENXIO);
    }

    mutex_enter(&unitp->ltc1427_mutex);

    unitp->ltc1427_oflag = 0;

    mutex_exit(&unitp->ltc1427_mutex);
    return (DDI_SUCCESS);
}

static int
ltc1427_ioctl(dev_t dev, int cmd, intptr_t arg, int mode,
        cred_t *credp, int *rvalp)
{
    _NOTE(ARGUNUSED(credp, rvalp))

    struct ltc1427_unit     *unitp;
    int         instance;
    int             err = 0;
    i2c_transfer_t      *i2c_tran_pointer;
    int32_t         fan_speed;

    if (arg == NULL) {
        D2CMN_ERR((CE_WARN, "LTC1427: ioctl: arg passed in to ioctl "
                "= NULL\n"));
        err = EINVAL;
        return (err);
    }
    instance = getminor(dev);
    unitp = (struct ltc1427_unit *)
        ddi_get_soft_state(ltc1427soft_statep, instance);

    mutex_enter(&unitp->ltc1427_mutex);

    switch (cmd) {
    case I2C_GET_OUTPUT:
        D1CMN_ERR((CE_NOTE, "current_set_flag = %d\n",
            unitp->current_set_flag));
        if (unitp->current_set_flag == 0) {
            err = EIO;
            break;
        } else {
            if (ddi_copyout((caddr_t)&unitp->current_value,
                (caddr_t)arg, sizeof (int32_t),
                mode) != DDI_SUCCESS) {
                D2CMN_ERR((CE_WARN,
                "%s: Failed in I2C_GET_OUTPUT "
                "ddi_copyout routine\n",
                    unitp->ltc1427_name));
                err = EFAULT;
                break;
            }
        }
        break;

    case I2C_SET_OUTPUT:
        if (ddi_copyin((caddr_t)arg, (caddr_t)&fan_speed,
            sizeof (int32_t), mode) != DDI_SUCCESS) {
            D2CMN_ERR((CE_WARN,
                "%s: Failed in I2C_SET_OUTPUT "
                "ioctl before switch\n",
                    unitp->ltc1427_name));
            err = EFAULT;
            break;
        }

        (void) i2c_transfer_alloc(unitp->ltc1427_hdl,
            &i2c_tran_pointer, 2, 0, I2C_SLEEP);
        if (i2c_tran_pointer == NULL) {
            D2CMN_ERR((CE_WARN,
                "%s: Failed in I2C_SET_OUTPUT "
                "i2c_transfer_pointer not allocated\n",
                    unitp->ltc1427_name));
            err = ENOMEM;
            break;
        }
        i2c_tran_pointer->i2c_flags = I2C_WR;
        i2c_tran_pointer->i2c_wbuf[0] =
            (uchar_t)((fan_speed >> 8) & 0x03);
        i2c_tran_pointer->i2c_wbuf[1] =
            (uchar_t)((fan_speed) & 0x000000ff);

        err = i2c_transfer(unitp->ltc1427_hdl, i2c_tran_pointer);
        if (!err) {
            unitp->current_value = fan_speed;
            unitp->current_set_flag = 1;
        }
        i2c_transfer_free(unitp->ltc1427_hdl, i2c_tran_pointer);
        break;

    default:
        D2CMN_ERR((CE_WARN, "%s: Invalid IOCTL cmd: %x\n",
            unitp->ltc1427_name, cmd));
        err = EINVAL;
    }

    mutex_exit(&unitp->ltc1427_mutex);
    return (err);
}

static int
ltc1427_attach(dev_info_t *dip, ddi_attach_cmd_t cmd)
{
    switch (cmd) {
    case DDI_ATTACH:
        return (ltc1427_do_attach(dip));
    case DDI_RESUME:
        return (ltc1427_do_resume());
    default:
        return (DDI_FAILURE);
    }
}

static int
ltc1427_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
{
    switch (cmd) {
    case DDI_DETACH:
        return (ltc1427_do_detach(dip));
    case DDI_SUSPEND:
        return (ltc1427_do_suspend());
    default:
        return (DDI_FAILURE);
    }
}

static int
ltc1427_do_attach(dev_info_t *dip)
{
    struct ltc1427_unit *unitp;
    int instance;

    instance = ddi_get_instance(dip);

    if (ddi_soft_state_zalloc(ltc1427soft_statep, instance) != 0) {
        cmn_err(CE_WARN, "%s%d: failed to zalloc softstate\n",
            ddi_get_name(dip), instance);
        return (DDI_FAILURE);
    }

    unitp = ddi_get_soft_state(ltc1427soft_statep, instance);

    if (unitp == NULL) {
        cmn_err(CE_WARN, "%s%d: unitp not filled\n",
            ddi_get_name(dip), instance);
        return (ENOMEM);
    }

    (void) snprintf(unitp->ltc1427_name, sizeof (unitp->ltc1427_name),
            "%s%d", ddi_node_name(dip), instance);

    if (ddi_create_minor_node(dip, "ltc1427", S_IFCHR, instance,
            "ddi_i2c:adio", NULL) == DDI_FAILURE) {
        cmn_err(CE_WARN, "%s ddi_create_minor_node failed for "
            "%s\n", unitp->ltc1427_name, "ltc1427");
        ddi_soft_state_free(ltc1427soft_statep, instance);

        return (DDI_FAILURE);
    }

    if (i2c_client_register(dip, &unitp->ltc1427_hdl) != I2C_SUCCESS) {
        ddi_remove_minor_node(dip, NULL);
        ddi_soft_state_free(ltc1427soft_statep, instance);

        return (DDI_FAILURE);
    }

    mutex_init(&unitp->ltc1427_mutex, NULL, MUTEX_DRIVER, NULL);

    return (DDI_SUCCESS);
}

static int
ltc1427_do_resume()
{
    int ret = DDI_SUCCESS;

    return (ret);
}

static int
ltc1427_do_suspend()
{
    int ret = DDI_SUCCESS;

    return (ret);
}

static int
ltc1427_do_detach(dev_info_t *dip)
{
    struct ltc1427_unit *unitp;
    int instance;

    instance = ddi_get_instance(dip);

    unitp = ddi_get_soft_state(ltc1427soft_statep, instance);

    if (unitp == NULL) {
        cmn_err(CE_WARN, "%s%d: unitp not filled\n",
            ddi_get_name(dip), instance);
        return (ENOMEM);
    }

    i2c_client_unregister(unitp->ltc1427_hdl);

    ddi_remove_minor_node(dip, NULL);

    mutex_destroy(&unitp->ltc1427_mutex);

    ddi_soft_state_free(ltc1427soft_statep, instance);

    return (DDI_SUCCESS);
}