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/*

 * w1_netlink.c

 *

 * Copyright (c) 2003 Evgeniy Polyakov <johnpol@2ka.mipt.ru>

 *

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 */

#include <linux/skbuff.h>

#include <linux/netlink.h>

#include <linux/connector.h>

#include "w1.h"

#include "w1_log.h"

#include "w1_netlink.h"

#if defined(CONFIG_W1_CON) && (defined(CONFIG_CONNECTOR) || (defined(CONFIG_CONNECTOR_MODULE) && defined(CONFIG_W1_MODULE)))

void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)

{

        char buf[sizeof(struct cn_msg) + sizeof(struct w1_netlink_msg)];

        struct cn_msg *m = (struct cn_msg *)buf;

        struct w1_netlink_msg *w = (struct w1_netlink_msg *)(m+1);

        memset(buf, 0, sizeof(buf));

        m->id.idx = CN_W1_IDX;

        m->id.val = CN_W1_VAL;

        m->seq = dev->seq++;

        m->len = sizeof(struct w1_netlink_msg);

        memcpy(w, msg, sizeof(struct w1_netlink_msg));

        cn_netlink_send(m, 0, GFP_KERNEL);

}

static int w1_process_command_master(struct w1_master *dev, struct cn_msg *msg,

                struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)

{

        dev_dbg(&dev->dev, "%s: %s: cmd=%02x, len=%u.\n",

                __func__, dev->name, cmd->cmd, cmd->len);

        if (cmd->cmd != W1_CMD_SEARCH && cmd->cmd != W1_CMD_ALARM_SEARCH)

                return -EINVAL;

        w1_search_process(dev, (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH);

        return 0;

}

static int w1_send_read_reply(struct w1_slave *sl, struct cn_msg *msg,

                struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)

{

        void *data;

        struct w1_netlink_msg *h;

        struct w1_netlink_cmd *c;

        struct cn_msg *cm;

        int err;

        data = kzalloc(sizeof(struct cn_msg) +

                        sizeof(struct w1_netlink_msg) +

                        sizeof(struct w1_netlink_cmd) +

                        cmd->len, GFP_KERNEL);

        if (!data)

                return -ENOMEM;

        cm = (struct cn_msg *)(data);

        h = (struct w1_netlink_msg *)(cm + 1);

        c = (struct w1_netlink_cmd *)(h + 1);

        memcpy(cm, msg, sizeof(struct cn_msg));

        memcpy(h, hdr, sizeof(struct w1_netlink_msg));

        memcpy(c, cmd, sizeof(struct w1_netlink_cmd));

        cm->ack = msg->seq+1;

        cm->len = sizeof(struct w1_netlink_msg) + sizeof(struct w1_netlink_cmd) + cmd->len;

        h->len = sizeof(struct w1_netlink_cmd) + cmd->len;

        memcpy(c->data, cmd->data, c->len);

        err = cn_netlink_send(cm, 0, GFP_KERNEL);

        kfree(data);

        return err;

}

static int w1_process_command_slave(struct w1_slave *sl, struct cn_msg *msg,

                struct w1_netlink_msg *hdr, struct w1_netlink_cmd *cmd)

{

        int err = 0;

        dev_dbg(&sl->master->dev, "%s: %02x.%012llx.%02x: cmd=%02x, len=%u.\n",

                __func__, sl->reg_num.family, (unsigned long long)sl->reg_num.id, sl->reg_num.crc,

                cmd->cmd, cmd->len);

        switch (cmd->cmd) {

                case W1_CMD_READ:

                        w1_read_block(sl->master, cmd->data, cmd->len);

                        w1_send_read_reply(sl, msg, hdr, cmd);

                        break;

                case W1_CMD_WRITE:

                        w1_write_block(sl->master, cmd->data, cmd->len);

                        break;

                case W1_CMD_SEARCH:

                case W1_CMD_ALARM_SEARCH:

                        w1_search_process(sl->master,

                                        (cmd->cmd == W1_CMD_ALARM_SEARCH)?W1_ALARM_SEARCH:W1_SEARCH);

                        break;

                default:

                        err = -1;

                        break;

        }

        return err;

}

static void w1_cn_callback(void *data)

{

        struct cn_msg *msg = data;

        struct w1_netlink_msg *m = (struct w1_netlink_msg *)(msg + 1);

        struct w1_netlink_cmd *cmd;

        struct w1_slave *sl;

        struct w1_master *dev;

        int err = 0;

        while (msg->len && !err) {

                struct w1_reg_num id;

                u16 mlen = m->len;

                u8 *cmd_data = m->data;

                dev = NULL;

                sl = NULL;

                memcpy(&id, m->id.id, sizeof(id));

#if 0

                printk("%s: %02x.%012llx.%02x: type=%02x, len=%u.\n",

                                __func__, id.family, (unsigned long long)id.id, id.crc, m->type, m->len);

#endif

                if (m->len + sizeof(struct w1_netlink_msg) > msg->len) {

                        err = -E2BIG;

                        break;

                }

                if (!mlen)

                        goto out_cont;

                if (m->type == W1_MASTER_CMD) {

                        dev = w1_search_master_id(m->id.mst.id);

                } else if (m->type == W1_SLAVE_CMD) {

                        sl = w1_search_slave(&id);

                        if (sl)

                                dev = sl->master;

                }

                if (!dev) {

                        err = -ENODEV;

                        goto out_cont;

                }

                mutex_lock(&dev->mutex);

                if (sl && w1_reset_select_slave(sl)) {

                        err = -ENODEV;

                        goto out_up;

                }

                while (mlen) {

                        cmd = (struct w1_netlink_cmd *)cmd_data;

                        if (cmd->len + sizeof(struct w1_netlink_cmd) > mlen) {

                                err = -E2BIG;

                                break;

                        }

                        if (sl)

                                w1_process_command_slave(sl, msg, m, cmd);

                        else

                                w1_process_command_master(dev, msg, m, cmd);

                        cmd_data += cmd->len + sizeof(struct w1_netlink_cmd);

                        mlen -= cmd->len + sizeof(struct w1_netlink_cmd);

                }

out_up:

                atomic_dec(&dev->refcnt);

                if (sl)

                        atomic_dec(&sl->refcnt);

                mutex_unlock(&dev->mutex);

out_cont:

                msg->len -= sizeof(struct w1_netlink_msg) + m->len;

                m = (struct w1_netlink_msg *)(((u8 *)m) + sizeof(struct w1_netlink_msg) + m->len);

                /*

                 * Let's allow requests for nonexisting devices.

                 */

                if (err == -ENODEV)

                        err = 0;

        }

#if 0

        if (err) {

                printk("%s: malformed message. Dropping.\n", __func__);

        }

#endif

}

int w1_init_netlink(void)

{

        struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};

        return cn_add_callback(&w1_id, "w1", &w1_cn_callback);

}

void w1_fini_netlink(void)

{

        struct cb_id w1_id = {.idx = CN_W1_IDX, .val = CN_W1_VAL};

        cn_del_callback(&w1_id);

}

#else

void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)

{

}

int w1_init_netlink(void)

{

        return 0;

}

void w1_fini_netlink(void)

{

}

#endif