/*
 * 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/lm75.h>
#include <sys/i2c/clients/lm75_impl.h>

static void *lm75soft_statep;

static int lm75_do_attach(dev_info_t *);
static int lm75_do_detach(dev_info_t *);
static int lm75_do_resume(void);
static int lm75_do_suspend(void);
static int lm75_get16(intptr_t, int, struct lm75_unit *, int);
static int lm75_set16(intptr_t, int, struct lm75_unit *, int);

/*
 * cb ops (only need ioctl)
 */
static int lm75_open(dev_t *, int, int, cred_t *);
static int lm75_close(dev_t, int, int, cred_t *);
static int lm75_ioctl(dev_t, int, intptr_t, int, cred_t *, int *);

static struct cb_ops lm75_cbops = {
        lm75_open,                      /* open  */
        lm75_close,                     /* close */
        nodev,                          /* strategy */
        nodev,                          /* print */
        nodev,                          /* dump */
        nodev,                          /* read */
        nodev,                          /* write */
        lm75_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 lm75_attach(dev_info_t *dip, ddi_attach_cmd_t cmd);
static int lm75_detach(dev_info_t *dip, ddi_detach_cmd_t cmd);

static struct dev_ops lm75_ops = {
        DEVO_REV,
        0,
        ddi_getinfo_1to1,
        nulldev,
        nulldev,
        lm75_attach,
        lm75_detach,
        nodev,
        &lm75_cbops,
        NULL,
        NULL,
        ddi_quiesce_not_needed,         /* quiesce */
};

extern struct mod_ops mod_driverops;

static struct modldrv lm75_modldrv = {
        &mod_driverops,                 /* type of module - driver */
        "LM75 i2c device driver",
        &lm75_ops
};

static struct modlinkage lm75_modlinkage = {
        MODREV_1,
        &lm75_modldrv,
        0
};


int
_init(void)
{
        int error;

        error = mod_install(&lm75_modlinkage);

        if (!error)
                (void) ddi_soft_state_init(&lm75soft_statep,
                    sizeof (struct lm75_unit), 1);
        return (error);
}

int
_fini(void)
{
        int error;

        error = mod_remove(&lm75_modlinkage);
        if (!error)
                ddi_soft_state_fini(&lm75soft_statep);

        return (error);
}

int
_info(struct modinfo *modinfop)
{
        return (mod_info(&lm75_modlinkage, modinfop));
}

static int
lm75_open(dev_t *devp, int flags, int otyp, cred_t *credp)
{
        _NOTE(ARGUNUSED(credp))

        struct lm75_unit *unitp;
        int instance;
        int error = 0;

        instance = getminor(*devp);

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

        unitp = (struct lm75_unit *)
            ddi_get_soft_state(lm75soft_statep, instance);

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

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

        mutex_enter(&unitp->lm75_mutex);

        if (flags & FEXCL) {
                if (unitp->lm75_oflag != 0) {
                        error = EBUSY;
                } else {
                        unitp->lm75_oflag = FEXCL;
                }
        } else {
                if (unitp->lm75_oflag == FEXCL) {
                        error = EBUSY;
                } else {
                        unitp->lm75_oflag = FOPEN;
                }
        }

        mutex_exit(&unitp->lm75_mutex);

        return (error);
}

static int
lm75_close(dev_t dev, int flags, int otyp, cred_t *credp)
{
        _NOTE(ARGUNUSED(flags, otyp, credp))

        struct lm75_unit *unitp;
        int instance;

        instance = getminor(dev);

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

        unitp = (struct lm75_unit *)
            ddi_get_soft_state(lm75soft_statep, instance);

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

        mutex_enter(&unitp->lm75_mutex);

        unitp->lm75_oflag = 0;

        mutex_exit(&unitp->lm75_mutex);
        return (DDI_SUCCESS);
}

static int
lm75_get16(intptr_t arg, int reg, struct lm75_unit *unitp, int mode)
{
        i2c_transfer_t          *i2c_tran_pointer;
        int err = DDI_SUCCESS;
        int16_t                 temp16;
        int8_t                  holder;

        (void) i2c_transfer_alloc(unitp->lm75_hdl, &i2c_tran_pointer,
            1, 2, I2C_SLEEP);
        if (i2c_tran_pointer == NULL) {
                D2CMN_ERR((CE_WARN, "%s: Failed in I2C_GET_TEMPERATURE "
                    "i2c_tran_pointer not allocated\n", unitp->lm75_name));
                return (ENOMEM);
        }

        i2c_tran_pointer->i2c_flags = I2C_WR_RD;
        i2c_tran_pointer->i2c_wbuf[0] = (uchar_t)reg;

        err = i2c_transfer(unitp->lm75_hdl, i2c_tran_pointer);
        if (err) {
                D2CMN_ERR((CE_WARN, "%s: Failed in I2C_GET_TEMPERATURE "
                    "i2c_transfer routine\n", unitp->lm75_name));
                i2c_transfer_free(unitp->lm75_hdl, i2c_tran_pointer);
                return (err);
        }

        D1CMN_ERR((CE_NOTE, "%s: rbuf[0] =  %x rbuf[1] = %x\n",
            unitp->lm75_name, i2c_tran_pointer->i2c_rbuf[0],
            i2c_tran_pointer->i2c_rbuf[0]));
        temp16 = i2c_tran_pointer->i2c_rbuf[0];
        temp16 = (temp16 << 1);
        temp16 = (temp16 | ((i2c_tran_pointer->i2c_rbuf[1] & 0x80) >> 7));


        if (temp16 & LM75_COMP_MASK) {
                holder = (temp16 & LM75_COMP_MASK_UPPER);
                holder = -holder;
                holder = holder/2;
                temp16 = 0 - holder;
        } else {
                temp16 = temp16 / 2;
        }
        if (ddi_copyout((caddr_t)&temp16, (caddr_t)arg,
            sizeof (int16_t), mode) != DDI_SUCCESS) {
                D2CMN_ERR((CE_WARN, "%s: Failed in I2C_GET_TEMPERATURE "
                    "ddi_copyout routine\n", unitp->lm75_name));
                err = EFAULT;
        }
        i2c_transfer_free(unitp->lm75_hdl, i2c_tran_pointer);
        return (err);
}

static int
lm75_set16(intptr_t arg, int reg, struct lm75_unit *unitp, int mode)
{
        i2c_transfer_t          *i2c_tran_pointer;
        int err = DDI_SUCCESS;
        int16_t                 temp16;

        if (ddi_copyin((caddr_t)arg, (caddr_t)&temp16,
            sizeof (int16_t), mode) != DDI_SUCCESS) {
                D2CMN_ERR((CE_WARN, "%s: Failed in LM74_SET_HYST "
                    "ddi_copyin routine\n", unitp->lm75_name));
                return (EFAULT);
        }

        (void) i2c_transfer_alloc(unitp->lm75_hdl, &i2c_tran_pointer,
            3, 0, I2C_SLEEP);
        if (i2c_tran_pointer == NULL) {
                D2CMN_ERR((CE_WARN, "%s: Failed in LM75_SET_HYST "
                    "i2c_tran_pointer not allocated\n", unitp->lm75_name));
                return (ENOMEM);
        }

        /* BEGIN CSTYLED */
        /*
         * The temperature is 16bits where the top 9 are a twos-complement
         * word with the the least significant bit used to indicate 0.5C
         *
         * |15|14|13|12|11|10| 9| 8| 7| 6| 5| 4| 3| 2| 1| 0|
         * |-----------------------------------------------|
         * |+-|      Temperature      |       Unused       |
         */
        /* END CSTYLED */
        i2c_tran_pointer->i2c_flags = I2C_WR;
        i2c_tran_pointer->i2c_wbuf[0] = (uchar_t)reg;
        i2c_tran_pointer->i2c_wbuf[1] = ((temp16 >> 1) & 0xff);
        i2c_tran_pointer->i2c_wbuf[2] = ((temp16 & 0x1) << 7);

        err = i2c_transfer(unitp->lm75_hdl, i2c_tran_pointer);
        i2c_transfer_free(unitp->lm75_hdl, i2c_tran_pointer);
        return (err);
}

static int
lm75_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *credp,
    int *rvalp)
{
        _NOTE(ARGUNUSED(credp, rvalp))

        struct lm75_unit        *unitp;
        int                     instance;
        int                     err = 0;
        i2c_transfer_t          *i2c_tran_pointer;
        uchar_t                 passin_byte;

        if (arg == (intptr_t)NULL) {
                D2CMN_ERR((CE_WARN, "LM75: ioctl: arg passed in to ioctl "
                    "= NULL\n"));
                err = EINVAL;
                return (err);
        }
        instance = getminor(dev);
        unitp = (struct lm75_unit *)
            ddi_get_soft_state(lm75soft_statep, instance);

        if (unitp == NULL) {
                cmn_err(CE_WARN, "LM75: ioctl: unitp = NULL\n");
                err = ENOMEM;
                return (err);
        }

        mutex_enter(&unitp->lm75_mutex);

        switch (cmd) {
        case I2C_GET_TEMPERATURE:
                err = lm75_get16(arg, LM75_TEMPERATURE_REG, unitp, mode);
                break;

        case LM75_GET_HYST:
                err = lm75_get16(arg, LM75_HYST_REG, unitp, mode);
                break;

        case LM75_SET_HYST:
                err = lm75_set16(arg, LM75_HYST_REG, unitp, mode);
                break;

        case LM75_GET_OVERTEMP_SHUTDOWN:
                err = lm75_get16(arg, LM75_OVERTEMP_REG, unitp, mode);
                break;

        case LM75_SET_OVERTEMP_SHUTDOWN:
                err = lm75_set16(arg, LM75_OVERTEMP_REG, unitp, mode);
                break;

        case LM75_GET_CONFIG:
                (void) i2c_transfer_alloc(unitp->lm75_hdl, &i2c_tran_pointer,
                    1, 1, I2C_SLEEP);
                if (i2c_tran_pointer == NULL) {
                        D2CMN_ERR((CE_WARN, "%s: Failed in LM75_GET_CONFIG "
                            "i2c_tran_pointer not allocated\n",
                            unitp->lm75_name));
                        err = ENOMEM;
                        break;
                }
                i2c_tran_pointer->i2c_flags = I2C_WR_RD;
                i2c_tran_pointer->i2c_wbuf[0] = LM75_CONFIGURATION_REG;

                err = i2c_transfer(unitp->lm75_hdl, i2c_tran_pointer);
                if (err) {
                        D2CMN_ERR((CE_WARN, "%s: Failed in LM75_GET_CONFIG "
                            "i2c_transfer routine\n",
                            unitp->lm75_name));
                        i2c_transfer_free(unitp->lm75_hdl, i2c_tran_pointer);
                        break;
                }
                if (ddi_copyout((caddr_t)i2c_tran_pointer->i2c_rbuf,
                    (caddr_t)arg,
                    sizeof (uint8_t), mode) != DDI_SUCCESS) {
                        D2CMN_ERR((CE_WARN, "%s: Failed in LM75_GET_CONFIG "
                            "ddi_copyout routine\n",
                            unitp->lm75_name));
                        err = EFAULT;
                }
                i2c_transfer_free(unitp->lm75_hdl, i2c_tran_pointer);
                break;

        case LM75_SET_CONFIG:
                if (ddi_copyin((caddr_t)arg, (caddr_t)&passin_byte,
                    sizeof (uint8_t), mode) != DDI_SUCCESS) {
                        D2CMN_ERR((CE_WARN, "%s: Failed in LM75_SET_CONFIG "
                            "ddi_copyin routine\n",
                            unitp->lm75_name));
                        err = EFAULT;
                        break;
                }
                (void) i2c_transfer_alloc(unitp->lm75_hdl, &i2c_tran_pointer,
                    2, 0, I2C_SLEEP);
                if (i2c_tran_pointer == NULL) {
                        D2CMN_ERR((CE_WARN, "%s: Failed in LM75_SET_CONFIG "
                            "i2c_tran_pointer not allocated\n",
                            unitp->lm75_name));
                        err = ENOMEM;
                        break;
                }
                i2c_tran_pointer->i2c_flags = I2C_WR;
                i2c_tran_pointer->i2c_wbuf[0] = LM75_CONFIGURATION_REG;
                i2c_tran_pointer->i2c_wbuf[1] = passin_byte;

                err = i2c_transfer(unitp->lm75_hdl, i2c_tran_pointer);
                i2c_transfer_free(unitp->lm75_hdl, i2c_tran_pointer);
                break;

        default:
                D2CMN_ERR((CE_WARN, "%s: Invalid IOCTL cmd %x\n",
                    unitp->lm75_name, cmd));
                err = EINVAL;
        }

        mutex_exit(&unitp->lm75_mutex);
        return (err);
}

static int
lm75_attach(dev_info_t *dip, ddi_attach_cmd_t cmd)
{
        switch (cmd) {
        case DDI_ATTACH:
                return (lm75_do_attach(dip));
        case DDI_RESUME:
                return (lm75_do_resume());
        default:
                return (DDI_FAILURE);
        }
}

static int
lm75_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
{
        switch (cmd) {
        case DDI_DETACH:
                return (lm75_do_detach(dip));
        case DDI_SUSPEND:
                return (lm75_do_suspend());
        default:
                return (DDI_FAILURE);
        }
}

static int
lm75_do_attach(dev_info_t *dip)
{
        struct lm75_unit *unitp;
        int instance;

        instance = ddi_get_instance(dip);

        if (ddi_soft_state_zalloc(lm75soft_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(lm75soft_statep, instance);

        if (unitp == NULL) {
                cmn_err(CE_WARN, "LM75: ioctl: unitp = NULL\n");
                return (ENOMEM);
        }

        (void) snprintf(unitp->lm75_name, sizeof (unitp->lm75_name),
            "%s%d", ddi_node_name(dip), instance);

        if (ddi_create_minor_node(dip, "lm75", S_IFCHR, instance,
            "ddi_i2c:temperature_sensor", 0) == DDI_FAILURE) {
                cmn_err(CE_WARN, "%s ddi_create_minor_node failed for "
                    "%s\n", unitp->lm75_name, "lm75");
                ddi_soft_state_free(lm75soft_statep, instance);

                return (DDI_FAILURE);
        }

        if (i2c_client_register(dip, &unitp->lm75_hdl) != I2C_SUCCESS) {
                ddi_remove_minor_node(dip, NULL);
                ddi_soft_state_free(lm75soft_statep, instance);

                return (DDI_FAILURE);
        }

        mutex_init(&unitp->lm75_mutex, NULL, MUTEX_DRIVER, NULL);

        return (DDI_SUCCESS);
}

static int
lm75_do_resume(void)
{
        int ret = DDI_SUCCESS;

        return (ret);
}

static int
lm75_do_suspend()
{
        int ret = DDI_SUCCESS;

        return (ret);
}

static int
lm75_do_detach(dev_info_t *dip)
{
        struct lm75_unit *unitp;
        int instance;

        instance = ddi_get_instance(dip);

        unitp = ddi_get_soft_state(lm75soft_statep, instance);

        if (unitp == NULL) {
                cmn_err(CE_WARN, "LM75: ioctl: unitp = NULL\n");
                return (ENOMEM);
        }

        i2c_client_unregister(unitp->lm75_hdl);

        ddi_remove_minor_node(dip, NULL);

        mutex_destroy(&unitp->lm75_mutex);
        ddi_soft_state_free(lm75soft_statep, instance);

        return (DDI_SUCCESS);
}