/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (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 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#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/pcf8591.h>
#include <sys/i2c/clients/pcf8591_impl.h>

static void *pcf8591soft_statep;

static uint8_t ipmode = PCF8591_4SINGLE;
static int32_t current_value = 0;
static int current_set_flag = 0;

static int pcf8591_do_attach(dev_info_t *);
static int pcf8591_do_detach(dev_info_t *);
static int pcf8591_do_resume(void);
static int pcf8591_do_suspend(void);

/*
 * cb ops (only need ioctl)
 */
static int pcf8591_open(dev_t *, int, int, cred_t *);
static int pcf8591_close(dev_t, int, int, cred_t *);
static int pcf8591_ioctl(dev_t, int, intptr_t, int, cred_t *, int *);

static struct cb_ops pcf8591_cbops = {
        pcf8591_open,                   /* open  */
        pcf8591_close,                  /* close */
        nodev,                          /* strategy */
        nodev,                          /* print */
        nodev,                          /* dump */
        nodev,                          /* read */
        nodev,                          /* write */
        pcf8591_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 pcf8591_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg,
                void **result);
static int pcf8591_attach(dev_info_t *dip, ddi_attach_cmd_t cmd);
static int pcf8591_detach(dev_info_t *dip, ddi_detach_cmd_t cmd);

static struct dev_ops pcf8591_ops = {
        DEVO_REV,
        0,
        pcf8591_info,
        nulldev,
        nulldev,
        pcf8591_attach,
        pcf8591_detach,
        nodev,
        &pcf8591_cbops,
        NULL,
        NULL,
        ddi_quiesce_not_needed,         /* quiesce */
};

extern struct mod_ops mod_driverops;

static struct modldrv pcf8591_modldrv = {
        &mod_driverops,                 /* type of module - driver */
        "PCF8591 i2c device driver",
        &pcf8591_ops
};

static struct modlinkage pcf8591_modlinkage = {
        MODREV_1,
        &pcf8591_modldrv,
        0
};


int
_init(void)
{
        int error;

        error = mod_install(&pcf8591_modlinkage);
        if (!error)
                (void) ddi_soft_state_init(&pcf8591soft_statep,
                    sizeof (struct pcf8591_unit), 1);
        return (error);
}

int
_fini(void)
{
        int error;

        error = mod_remove(&pcf8591_modlinkage);
        if (!error)
                ddi_soft_state_fini(&pcf8591soft_statep);

        return (error);
}

int
_info(struct modinfo *modinfop)
{
        return (mod_info(&pcf8591_modlinkage, modinfop));
}

static int
pcf8591_open(dev_t *devp, int flags, int otyp, cred_t *credp)
{
        _NOTE(ARGUNUSED(credp))

        struct pcf8591_unit *unitp;
        int instance;
        int error = 0;

        instance = MINOR_TO_INST(getminor(*devp));

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

        unitp = (struct pcf8591_unit *)
            ddi_get_soft_state(pcf8591soft_statep, instance);

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

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

        mutex_enter(&unitp->pcf8591_mutex);

        if (flags & FEXCL) {
                if (unitp->pcf8591_oflag != 0) {
                        error = EBUSY;
                } else {
                        unitp->pcf8591_oflag = FEXCL;
                }
        } else {
                if (unitp->pcf8591_oflag == FEXCL) {
                        error = EBUSY;
                } else {
                        unitp->pcf8591_oflag = FOPEN;
                }
        }

        mutex_exit(&unitp->pcf8591_mutex);

        return (error);
}

static int
pcf8591_close(dev_t dev, int flags, int otyp, cred_t *credp)
{
        _NOTE(ARGUNUSED(flags, otyp, credp))

        struct pcf8591_unit *unitp;
        int instance;

        instance = MINOR_TO_INST(getminor(dev));

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

        unitp = (struct pcf8591_unit *)
            ddi_get_soft_state(pcf8591soft_statep, instance);

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

        mutex_enter(&unitp->pcf8591_mutex);

        unitp->pcf8591_oflag = 0;

        mutex_exit(&unitp->pcf8591_mutex);
        return (DDI_SUCCESS);
}

static int
pcf8591_ioctl(dev_t dev, int cmd, intptr_t arg, int mode,
    cred_t *credp, int *rvalp)
{
        _NOTE(ARGUNUSED(credp, rvalp))

        struct pcf8591_unit     *unitp;
        int                     err = 0;
        i2c_transfer_t          *i2c_tran_pointer;
        int port = MINOR_TO_PORT(getminor(dev));
        int instance = MINOR_TO_INST(getminor(dev));
        int autoincr = 0;
        uchar_t control, reg;
        int32_t value;
        uint8_t uvalue;

        if (arg == (intptr_t)NULL) {
                D2CMN_ERR((CE_WARN, "PCF8591: ioctl: arg passed in to ioctl "
                    "= NULL\n"));
                err = EINVAL;
                return (err);
        }
        unitp = (struct pcf8591_unit *)
            ddi_get_soft_state(pcf8591soft_statep, instance);

        if (unitp == NULL) {
                cmn_err(CE_WARN, "PCF8591: ioctl: unitp not filled\n");
                return (ENOMEM);
        }

        mutex_enter(&unitp->pcf8591_mutex);

        D1CMN_ERR((CE_NOTE, "%s: ioctl: port = %d  instance = %d\n",
            unitp->pcf8591_name, port, instance));

        switch (cmd) {
        case I2C_GET_INPUT:
                (void) i2c_transfer_alloc(unitp->pcf8591_hdl, &i2c_tran_pointer,
                    1, 2, I2C_SLEEP);
                if (i2c_tran_pointer == NULL) {
                        D2CMN_ERR((CE_WARN, "%s: Failed in I2C_GET_INPUT "
                            "i2c_tran_pointer not allocated\n",
                            unitp->pcf8591_name));
                        err = ENOMEM;
                        break;
                }
                reg = (uchar_t)port;
                if ((reg == 0x02) && (ipmode == PCF8591_2DIFF)) {
                        D2CMN_ERR((CE_WARN, "%s: Failed in I2C_GET_INPUT "
                            "cannot use port 2 when ipmode is "
                            "0x03\n", unitp->pcf8591_name));
                        err = EIO;
                        i2c_transfer_free(unitp->pcf8591_hdl, i2c_tran_pointer);
                        break;
                }

                if ((reg == 0x03) && (ipmode != PCF8591_4SINGLE)) {
                        D2CMN_ERR((CE_WARN, "%s: Failed in I2C_GET_INPUT "
                            "cannot use port 3 when ipmode is not "
                            "0x00\n", unitp->pcf8591_name));
                        err = EIO;
                        i2c_transfer_free(unitp->pcf8591_hdl, i2c_tran_pointer);
                        break;
                }
                control = ((0 << PCF8591_ANALOG_OUTPUT_SHIFT) |
                    (ipmode << PCF8591_ANALOG_INPUT_SHIFT) |
                    (autoincr << PCF8591_AUTOINCR_SHIFT) | reg);

                i2c_tran_pointer->i2c_flags = I2C_WR_RD;
                i2c_tran_pointer->i2c_wbuf[0] = control;

                err = i2c_transfer(unitp->pcf8591_hdl, i2c_tran_pointer);
                if (err) {
                        D2CMN_ERR((CE_WARN, "%s: Failed in I2C_GET_INPUT"
                            " i2c_transfer routine\n",
                            unitp->pcf8591_name));
                        i2c_transfer_free(unitp->pcf8591_hdl, i2c_tran_pointer);
                        break;
                }
                i2c_tran_pointer->i2c_rbuf[0] = i2c_tran_pointer->i2c_rbuf[1];
                value = i2c_tran_pointer->i2c_rbuf[0];
                D1CMN_ERR((CE_NOTE, "%s: Back from transfer result is %x\n",
                    unitp->pcf8591_name, value));
                if (ddi_copyout((caddr_t)&value,
                    (caddr_t)arg,
                    sizeof (int32_t), mode) != DDI_SUCCESS) {
                        D2CMN_ERR((CE_WARN, "%s: Failed I2C_GET_INPUT"
                            " ddi_copyout routine\n",
                            unitp->pcf8591_name));
                        err = EFAULT;
                }
                i2c_transfer_free(unitp->pcf8591_hdl, i2c_tran_pointer);
                break;

        case I2C_SET_OUTPUT:
                reg = (uchar_t)port;
                if (ipmode != PCF8591_4SINGLE) {
                        D2CMN_ERR((CE_WARN, "%s: Failed in I2C_SET_OUTPUT "
                            "cannot set output when ipmode is not "
                            "0x00\n", unitp->pcf8591_name));
                        err = EIO;
                        break;
                }

                (void) i2c_transfer_alloc(unitp->pcf8591_hdl, &i2c_tran_pointer,
                    2, 0, I2C_SLEEP);
                if (i2c_tran_pointer == NULL) {
                        D2CMN_ERR((CE_WARN, "%s: Failed in "
                            "I2C_SET_OUTPUT "
                            "i2c_tran_pointer not allocated\n",
                            unitp->pcf8591_name));
                        err = ENOMEM;
                        break;
                }
                if (ddi_copyin((caddr_t)arg, (caddr_t)&value,
                    sizeof (int32_t), mode) != DDI_SUCCESS) {
                        D2CMN_ERR((CE_WARN, "%s: Failed in I2C_SET_OUTPUT"
                            " ddi_copyout routine\n",
                            unitp->pcf8591_name));
                        err = EFAULT;
                        i2c_transfer_free(unitp->pcf8591_hdl, i2c_tran_pointer);
                        break;
                }
                control = ((1 << PCF8591_ANALOG_OUTPUT_SHIFT) |
                    (0 << PCF8591_ANALOG_INPUT_SHIFT) |
                    (autoincr << PCF8591_AUTOINCR_SHIFT) | reg);

                i2c_tran_pointer->i2c_flags = I2C_WR;
                i2c_tran_pointer->i2c_wbuf[0] = control;
                i2c_tran_pointer->i2c_wbuf[1] = (uchar_t)value;

                err = i2c_transfer(unitp->pcf8591_hdl, i2c_tran_pointer);
                if (!err) {
                        current_value = value;
                        current_set_flag = 1;
                }
                i2c_transfer_free(unitp->pcf8591_hdl, i2c_tran_pointer);
                break;

        case I2C_GET_OUTPUT:
                if (current_set_flag == 0) {
                        err = EIO;
                        break;
                } else {
                        if (ddi_copyout((caddr_t)(uintptr_t)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->pcf8591_name));
                                err = EFAULT;
                                break;
                        }
                }
                break;

        case PCF8591_SET_IPMODE:
                if (ddi_copyin((caddr_t)arg, (caddr_t)&uvalue,
                    sizeof (uint_t), mode) != DDI_SUCCESS) {
                        D2CMN_ERR((CE_WARN, "%s: Failed in PCF8591_SET_IPMODE"
                            " ddi_copyout routine\n",
                            unitp->pcf8591_name));
                        err = EFAULT;
                        break;
                }

                if (uvalue > 0x03) {
                        D2CMN_ERR((CE_WARN, "%s: Failed in PCF8591_SET_IPMODE"
                            " value is not a valid mode\n",
                            unitp->pcf8591_name));
                        err = EIO;
                        break;
                }

                ipmode = uvalue;
                break;

        default:
                D2CMN_ERR((CE_WARN, "%s: Invalid IOCTL cmd: %x\n",
                    unitp->pcf8591_name, cmd));
                err = EINVAL;
        }

        mutex_exit(&unitp->pcf8591_mutex);
        return (err);

}

/* ARGSUSED */
static int
pcf8591_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
{
        dev_t   dev;
        int     instance;

        if (infocmd == DDI_INFO_DEVT2INSTANCE) {
                dev = (dev_t)arg;
                instance = MINOR_TO_INST(getminor(dev));
                *result = (void *)(uintptr_t)instance;
                return (DDI_SUCCESS);
        }
        return (DDI_FAILURE);
}

static int
pcf8591_attach(dev_info_t *dip, ddi_attach_cmd_t cmd)
{
        switch (cmd) {
        case DDI_ATTACH:
                return (pcf8591_do_attach(dip));
        case DDI_RESUME:
                return (pcf8591_do_resume());
        default:
                return (DDI_FAILURE);
        }
}

static int
pcf8591_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
{
        switch (cmd) {
        case DDI_DETACH:
                return (pcf8591_do_detach(dip));
        case DDI_SUSPEND:
                return (pcf8591_do_suspend());
        default:
                return (DDI_FAILURE);
        }
}

static int
pcf8591_do_attach(dev_info_t *dip)
{
        struct pcf8591_unit *unitp;
        int instance;
        char name[MAXNAMELEN];
        minor_t minor_number;
        int i;

        instance = ddi_get_instance(dip);

        if (ddi_soft_state_zalloc(pcf8591soft_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(pcf8591soft_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->pcf8591_name, sizeof (unitp->pcf8591_name),
            "%s%d", ddi_node_name(dip), instance);

        for (i = 0; i < 4; i++) {
                (void) sprintf(name, "port_%d", i);

                minor_number = INST_TO_MINOR(instance) |
                    PORT_TO_MINOR(I2C_PORT(i));

                if (ddi_create_minor_node(dip, name, S_IFCHR, minor_number,
                    "ddi_i2c:adio", 0) == DDI_FAILURE) {
                        cmn_err(CE_WARN, "%s ddi_create_minor_node failed for "
                            "%s\n", unitp->pcf8591_name, name);
                        ddi_soft_state_free(pcf8591soft_statep, instance);

                        return (DDI_FAILURE);
                }
        }

        if (i2c_client_register(dip, &unitp->pcf8591_hdl) != I2C_SUCCESS) {
                ddi_remove_minor_node(dip, NULL);
                ddi_soft_state_free(pcf8591soft_statep, instance);

                return (DDI_FAILURE);
        }

        mutex_init(&unitp->pcf8591_mutex, NULL, MUTEX_DRIVER, NULL);

        return (DDI_SUCCESS);
}

static int
pcf8591_do_resume()
{
        int ret = DDI_SUCCESS;

        return (ret);
}

static int
pcf8591_do_suspend()
{
        int ret = DDI_SUCCESS;

        return (ret);
}

static int
pcf8591_do_detach(dev_info_t *dip)
{
        struct pcf8591_unit *unitp;
        int instance;

        instance = ddi_get_instance(dip);

        unitp = ddi_get_soft_state(pcf8591soft_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->pcf8591_hdl);

        ddi_remove_minor_node(dip, NULL);

        mutex_destroy(&unitp->pcf8591_mutex);

        ddi_soft_state_free(pcf8591soft_statep, instance);

        return (DDI_SUCCESS);
}