// SPDX-License-Identifier: GPL-2.0-only
/*
 * driver for the GE IP-OCTAL boards
 *
 * Copyright (C) 2009-2012 CERN (www.cern.ch)
 * Author: Nicolas Serafini, EIC2 SA
 * Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
 */

#include <linux/device.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/tty.h>
#include <linux/serial.h>
#include <linux/tty_flip.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/ipack.h>
#include "ipoctal.h"
#include "scc2698.h"

#define IP_OCTAL_ID_SPACE_VECTOR    0x41
#define IP_OCTAL_NB_BLOCKS          4

static const struct tty_operations ipoctal_fops;

struct ipoctal_channel {
        struct ipoctal_stats            stats;
        unsigned int                    nb_bytes;
        wait_queue_head_t               queue;
        spinlock_t                      lock;
        unsigned int                    pointer_read;
        unsigned int                    pointer_write;
        struct tty_port                 tty_port;
        bool                            tty_registered;
        union scc2698_channel __iomem   *regs;
        union scc2698_block __iomem     *block_regs;
        unsigned int                    board_id;
        u8                              isr_rx_rdy_mask;
        u8                              isr_tx_rdy_mask;
        unsigned int                    rx_enable;
};

struct ipoctal {
        struct ipack_device             *dev;
        unsigned int                    board_id;
        struct ipoctal_channel          channel[NR_CHANNELS];
        struct tty_driver               *tty_drv;
        u8 __iomem                      *mem8_space;
        u8 __iomem                      *int_space;
};

static inline struct ipoctal *chan_to_ipoctal(struct ipoctal_channel *chan,
                                              unsigned int index)
{
        return container_of(chan, struct ipoctal, channel[index]);
}

static void ipoctal_reset_channel(struct ipoctal_channel *channel)
{
        iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
        channel->rx_enable = 0;
        iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
        iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
        iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);
        iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr);
}

static int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty)
{
        struct ipoctal_channel *channel;

        channel = dev_get_drvdata(tty->dev);

        /*
         * Enable RX. TX will be enabled when
         * there is something to send
         */
        iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
        channel->rx_enable = 1;
        return 0;
}

static int ipoctal_install(struct tty_driver *driver, struct tty_struct *tty)
{
        struct ipoctal_channel *channel = dev_get_drvdata(tty->dev);
        struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index);
        int res;

        if (!ipack_get_carrier(ipoctal->dev))
                return -EBUSY;

        res = tty_standard_install(driver, tty);
        if (res)
                goto err_put_carrier;

        tty->driver_data = channel;

        return 0;

err_put_carrier:
        ipack_put_carrier(ipoctal->dev);

        return res;
}

static int ipoctal_open(struct tty_struct *tty, struct file *file)
{
        struct ipoctal_channel *channel = tty->driver_data;

        return tty_port_open(&channel->tty_port, tty, file);
}

static void ipoctal_reset_stats(struct ipoctal_stats *stats)
{
        stats->tx = 0;
        stats->rx = 0;
        stats->rcv_break = 0;
        stats->framing_err = 0;
        stats->overrun_err = 0;
        stats->parity_err = 0;
}

static void ipoctal_free_channel(struct ipoctal_channel *channel)
{
        ipoctal_reset_stats(&channel->stats);
        channel->pointer_read = 0;
        channel->pointer_write = 0;
        channel->nb_bytes = 0;
}

static void ipoctal_close(struct tty_struct *tty, struct file *filp)
{
        struct ipoctal_channel *channel = tty->driver_data;

        tty_port_close(&channel->tty_port, tty, filp);
        ipoctal_free_channel(channel);
}

static int ipoctal_get_icount(struct tty_struct *tty,
                              struct serial_icounter_struct *icount)
{
        struct ipoctal_channel *channel = tty->driver_data;

        icount->cts = 0;
        icount->dsr = 0;
        icount->rng = 0;
        icount->dcd = 0;
        icount->rx = channel->stats.rx;
        icount->tx = channel->stats.tx;
        icount->frame = channel->stats.framing_err;
        icount->parity = channel->stats.parity_err;
        icount->brk = channel->stats.rcv_break;
        return 0;
}

static void ipoctal_irq_rx(struct ipoctal_channel *channel, u8 sr)
{
        struct tty_port *port = &channel->tty_port;
        u8 isr, value, flag;

        do {
                value = ioread8(&channel->regs->r.rhr);
                flag = TTY_NORMAL;
                /* Error: count statistics */
                if (sr & SR_ERROR) {
                        iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr);

                        if (sr & SR_OVERRUN_ERROR) {
                                channel->stats.overrun_err++;
                                /* Overrun doesn't affect the current character*/
                                tty_insert_flip_char(port, 0, TTY_OVERRUN);
                        }
                        if (sr & SR_PARITY_ERROR) {
                                channel->stats.parity_err++;
                                flag = TTY_PARITY;
                        }
                        if (sr & SR_FRAMING_ERROR) {
                                channel->stats.framing_err++;
                                flag = TTY_FRAME;
                        }
                        if (sr & SR_RECEIVED_BREAK) {
                                channel->stats.rcv_break++;
                                flag = TTY_BREAK;
                        }
                }
                tty_insert_flip_char(port, value, flag);

                /* Check if there are more characters in RX FIFO
                 * If there are more, the isr register for this channel
                 * has enabled the RxRDY|FFULL bit.
                 */
                isr = ioread8(&channel->block_regs->r.isr);
                sr = ioread8(&channel->regs->r.sr);
        } while (isr & channel->isr_rx_rdy_mask);

        tty_flip_buffer_push(port);
}

static void ipoctal_irq_tx(struct ipoctal_channel *channel)
{
        unsigned int *pointer_write = &channel->pointer_write;
        u8 value;

        if (channel->nb_bytes == 0)
                return;

        spin_lock(&channel->lock);
        value = channel->tty_port.xmit_buf[*pointer_write];
        iowrite8(value, &channel->regs->w.thr);
        channel->stats.tx++;
        (*pointer_write)++;
        *pointer_write = *pointer_write % PAGE_SIZE;
        channel->nb_bytes--;
        spin_unlock(&channel->lock);
}

static void ipoctal_irq_channel(struct ipoctal_channel *channel)
{
        u8 isr, sr;

        /* The HW is organized in pair of channels.  See which register we need
         * to read from */
        isr = ioread8(&channel->block_regs->r.isr);
        sr = ioread8(&channel->regs->r.sr);

        if (isr & (IMR_DELTA_BREAK_A | IMR_DELTA_BREAK_B))
                iowrite8(CR_CMD_RESET_BREAK_CHANGE, &channel->regs->w.cr);

        if ((sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) {
                iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
                /* In case of RS-485, change from TX to RX when finishing TX.
                 * Half-duplex. */
                if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
                        iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr);
                        iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
                        channel->rx_enable = 1;
                }
        }

        /* RX data */
        if ((isr & channel->isr_rx_rdy_mask) && (sr & SR_RX_READY))
                ipoctal_irq_rx(channel, sr);

        /* TX of each character */
        if ((isr & channel->isr_tx_rdy_mask) && (sr & SR_TX_READY))
                ipoctal_irq_tx(channel);
}

static irqreturn_t ipoctal_irq_handler(void *arg)
{
        unsigned int i;
        struct ipoctal *ipoctal = arg;

        /* Clear the IPack device interrupt */
        readw(ipoctal->int_space + ACK_INT_REQ0);
        readw(ipoctal->int_space + ACK_INT_REQ1);

        /* Check all channels */
        for (i = 0; i < NR_CHANNELS; i++)
                ipoctal_irq_channel(&ipoctal->channel[i]);

        return IRQ_HANDLED;
}

static const struct tty_port_operations ipoctal_tty_port_ops = {
        .dtr_rts = NULL,
        .activate = ipoctal_port_activate,
};

static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr,
                             unsigned int slot)
{
        int res;
        int i;
        struct tty_driver *drv;
        struct ipoctal_channel *channel;
        struct ipack_region *region;
        void __iomem *addr;
        union scc2698_channel __iomem *chan_regs;
        union scc2698_block __iomem *block_regs;

        ipoctal->board_id = ipoctal->dev->id_device;

        region = &ipoctal->dev->region[IPACK_IO_SPACE];
        addr = devm_ioremap(&ipoctal->dev->dev,
                                    region->start, region->size);
        if (!addr) {
                dev_err(&ipoctal->dev->dev,
                        "Unable to map slot [%d:%d] IO space!\n",
                        bus_nr, slot);
                return -EADDRNOTAVAIL;
        }
        /* Save the virtual address to access the registers easily */
        chan_regs =
                (union scc2698_channel __iomem *) addr;
        block_regs =
                (union scc2698_block __iomem *) addr;

        region = &ipoctal->dev->region[IPACK_INT_SPACE];
        ipoctal->int_space =
                devm_ioremap(&ipoctal->dev->dev,
                                     region->start, region->size);
        if (!ipoctal->int_space) {
                dev_err(&ipoctal->dev->dev,
                        "Unable to map slot [%d:%d] INT space!\n",
                        bus_nr, slot);
                return -EADDRNOTAVAIL;
        }

        region = &ipoctal->dev->region[IPACK_MEM8_SPACE];
        ipoctal->mem8_space =
                devm_ioremap(&ipoctal->dev->dev,
                                     region->start, 0x8000);
        if (!ipoctal->mem8_space) {
                dev_err(&ipoctal->dev->dev,
                        "Unable to map slot [%d:%d] MEM8 space!\n",
                        bus_nr, slot);
                return -EADDRNOTAVAIL;
        }


        /* Disable RX and TX before touching anything */
        for (i = 0; i < NR_CHANNELS ; i++) {
                struct ipoctal_channel *channel = &ipoctal->channel[i];
                channel->regs = chan_regs + i;
                channel->block_regs = block_regs + (i >> 1);
                channel->board_id = ipoctal->board_id;
                if (i & 1) {
                        channel->isr_tx_rdy_mask = ISR_TxRDY_B;
                        channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_B;
                } else {
                        channel->isr_tx_rdy_mask = ISR_TxRDY_A;
                        channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_A;
                }

                ipoctal_reset_channel(channel);
                iowrite8(MR1_CHRL_8_BITS | MR1_ERROR_CHAR | MR1_RxINT_RxRDY,
                         &channel->regs->w.mr); /* mr1 */
                iowrite8(0, &channel->regs->w.mr); /* mr2 */
                iowrite8(TX_CLK_9600  | RX_CLK_9600, &channel->regs->w.csr);
        }

        for (i = 0; i < IP_OCTAL_NB_BLOCKS; i++) {
                iowrite8(ACR_BRG_SET2, &block_regs[i].w.acr);
                iowrite8(OPCR_MPP_OUTPUT | OPCR_MPOa_RTSN | OPCR_MPOb_RTSN,
                         &block_regs[i].w.opcr);
                iowrite8(IMR_TxRDY_A | IMR_RxRDY_FFULL_A | IMR_DELTA_BREAK_A |
                         IMR_TxRDY_B | IMR_RxRDY_FFULL_B | IMR_DELTA_BREAK_B,
                         &block_regs[i].w.imr);
        }

        /* Dummy write */
        iowrite8(1, ipoctal->mem8_space + 1);

        /* Register the TTY device */

        /* Each IP-OCTAL channel is a TTY port */
        drv = tty_alloc_driver(NR_CHANNELS, TTY_DRIVER_REAL_RAW |
                        TTY_DRIVER_DYNAMIC_DEV);
        if (IS_ERR(drv))
                return PTR_ERR(drv);

        /* Fill struct tty_driver with ipoctal data */
        drv->owner = THIS_MODULE;
        drv->driver_name = KBUILD_MODNAME;
        drv->name = kasprintf(GFP_KERNEL, KBUILD_MODNAME ".%d.%d.", bus_nr, slot);
        if (!drv->name) {
                res = -ENOMEM;
                goto err_put_driver;
        }
        drv->major = 0;

        drv->minor_start = 0;
        drv->type = TTY_DRIVER_TYPE_SERIAL;
        drv->subtype = SERIAL_TYPE_NORMAL;
        drv->init_termios = tty_std_termios;
        drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
        drv->init_termios.c_ispeed = 9600;
        drv->init_termios.c_ospeed = 9600;

        tty_set_operations(drv, &ipoctal_fops);
        res = tty_register_driver(drv);
        if (res) {
                dev_err(&ipoctal->dev->dev, "Can't register tty driver.\n");
                goto err_free_name;
        }

        /* Save struct tty_driver for use it when uninstalling the device */
        ipoctal->tty_drv = drv;

        for (i = 0; i < NR_CHANNELS; i++) {
                struct device *tty_dev;

                channel = &ipoctal->channel[i];
                tty_port_init(&channel->tty_port);
                res = tty_port_alloc_xmit_buf(&channel->tty_port);
                if (res)
                        continue;
                channel->tty_port.ops = &ipoctal_tty_port_ops;

                ipoctal_reset_stats(&channel->stats);
                channel->nb_bytes = 0;
                spin_lock_init(&channel->lock);
                channel->pointer_read = 0;
                channel->pointer_write = 0;
                tty_dev = tty_port_register_device_attr(&channel->tty_port, drv,
                                                        i, NULL, channel, NULL);
                if (IS_ERR(tty_dev)) {
                        dev_err(&ipoctal->dev->dev, "Failed to register tty device.\n");
                        tty_port_free_xmit_buf(&channel->tty_port);
                        tty_port_destroy(&channel->tty_port);
                        continue;
                }
                channel->tty_registered = true;
        }

        /*
         * IP-OCTAL has different addresses to copy its IRQ vector.
         * Depending of the carrier these addresses are accesible or not.
         * More info in the datasheet.
         */
        ipoctal->dev->bus->ops->request_irq(ipoctal->dev,
                                       ipoctal_irq_handler, ipoctal);

        return 0;

err_free_name:
        kfree(drv->name);
err_put_driver:
        tty_driver_kref_put(drv);

        return res;
}

static inline size_t ipoctal_copy_write_buffer(struct ipoctal_channel *channel,
                                               const u8 *buf, size_t count)
{
        unsigned long flags;
        size_t i;
        unsigned int *pointer_read = &channel->pointer_read;

        /* Copy the bytes from the user buffer to the internal one */
        for (i = 0; i < count; i++) {
                if (i <= (PAGE_SIZE - channel->nb_bytes)) {
                        spin_lock_irqsave(&channel->lock, flags);
                        channel->tty_port.xmit_buf[*pointer_read] = buf[i];
                        *pointer_read = (*pointer_read + 1) % PAGE_SIZE;
                        channel->nb_bytes++;
                        spin_unlock_irqrestore(&channel->lock, flags);
                } else {
                        break;
                }
        }
        return i;
}

static ssize_t ipoctal_write_tty(struct tty_struct *tty, const u8 *buf,
                                 size_t count)
{
        struct ipoctal_channel *channel = tty->driver_data;
        size_t char_copied;

        char_copied = ipoctal_copy_write_buffer(channel, buf, count);

        /* As the IP-OCTAL 485 only supports half duplex, do it manually */
        if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) {
                iowrite8(CR_DISABLE_RX, &channel->regs->w.cr);
                channel->rx_enable = 0;
                iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr);
        }

        /*
         * Send a packet and then disable TX to avoid failure after several send
         * operations
         */
        iowrite8(CR_ENABLE_TX, &channel->regs->w.cr);
        return char_copied;
}

static unsigned int ipoctal_write_room(struct tty_struct *tty)
{
        struct ipoctal_channel *channel = tty->driver_data;

        return PAGE_SIZE - channel->nb_bytes;
}

static unsigned int ipoctal_chars_in_buffer(struct tty_struct *tty)
{
        struct ipoctal_channel *channel = tty->driver_data;

        return channel->nb_bytes;
}

static void ipoctal_set_termios(struct tty_struct *tty,
                                const struct ktermios *old_termios)
{
        unsigned int cflag;
        unsigned char mr1 = 0;
        unsigned char mr2 = 0;
        unsigned char csr = 0;
        struct ipoctal_channel *channel = tty->driver_data;
        speed_t baud;

        cflag = tty->termios.c_cflag;

        /* Disable and reset everything before change the setup */
        ipoctal_reset_channel(channel);

        /* Set Bits per chars */
        switch (cflag & CSIZE) {
        case CS6:
                mr1 |= MR1_CHRL_6_BITS;
                break;
        case CS7:
                mr1 |= MR1_CHRL_7_BITS;
                break;
        case CS8:
        default:
                mr1 |= MR1_CHRL_8_BITS;
                /* By default, select CS8 */
                tty->termios.c_cflag = (cflag & ~CSIZE) | CS8;
                break;
        }

        /* Set Parity */
        if (cflag & PARENB)
                if (cflag & PARODD)
                        mr1 |= MR1_PARITY_ON | MR1_PARITY_ODD;
                else
                        mr1 |= MR1_PARITY_ON | MR1_PARITY_EVEN;
        else
                mr1 |= MR1_PARITY_OFF;

        /* Mark or space parity is not supported */
        tty->termios.c_cflag &= ~CMSPAR;

        /* Set stop bits */
        if (cflag & CSTOPB)
                mr2 |= MR2_STOP_BITS_LENGTH_2;
        else
                mr2 |= MR2_STOP_BITS_LENGTH_1;

        /* Set the flow control */
        switch (channel->board_id) {
        case IPACK1_DEVICE_ID_SBS_OCTAL_232:
                if (cflag & CRTSCTS) {
                        mr1 |= MR1_RxRTS_CONTROL_ON;
                        mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_ON;
                } else {
                        mr1 |= MR1_RxRTS_CONTROL_OFF;
                        mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
                }
                break;
        case IPACK1_DEVICE_ID_SBS_OCTAL_422:
                mr1 |= MR1_RxRTS_CONTROL_OFF;
                mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
                break;
        case IPACK1_DEVICE_ID_SBS_OCTAL_485:
                mr1 |= MR1_RxRTS_CONTROL_OFF;
                mr2 |= MR2_TxRTS_CONTROL_ON | MR2_CTS_ENABLE_TX_OFF;
                break;
        default:
                return;
        }

        baud = tty_get_baud_rate(tty);
        tty_termios_encode_baud_rate(&tty->termios, baud, baud);

        /* Set baud rate */
        switch (baud) {
        case 75:
                csr |= TX_CLK_75 | RX_CLK_75;
                break;
        case 110:
                csr |= TX_CLK_110 | RX_CLK_110;
                break;
        case 150:
                csr |= TX_CLK_150 | RX_CLK_150;
                break;
        case 300:
                csr |= TX_CLK_300 | RX_CLK_300;
                break;
        case 600:
                csr |= TX_CLK_600 | RX_CLK_600;
                break;
        case 1200:
                csr |= TX_CLK_1200 | RX_CLK_1200;
                break;
        case 1800:
                csr |= TX_CLK_1800 | RX_CLK_1800;
                break;
        case 2000:
                csr |= TX_CLK_2000 | RX_CLK_2000;
                break;
        case 2400:
                csr |= TX_CLK_2400 | RX_CLK_2400;
                break;
        case 4800:
                csr |= TX_CLK_4800  | RX_CLK_4800;
                break;
        case 9600:
                csr |= TX_CLK_9600  | RX_CLK_9600;
                break;
        case 19200:
                csr |= TX_CLK_19200 | RX_CLK_19200;
                break;
        case 38400:
        default:
                csr |= TX_CLK_38400 | RX_CLK_38400;
                /* In case of default, we establish 38400 bps */
                tty_termios_encode_baud_rate(&tty->termios, 38400, 38400);
                break;
        }

        mr1 |= MR1_ERROR_CHAR;
        mr1 |= MR1_RxINT_RxRDY;

        /* Write the control registers */
        iowrite8(mr1, &channel->regs->w.mr);
        iowrite8(mr2, &channel->regs->w.mr);
        iowrite8(csr, &channel->regs->w.csr);

        /* Enable again the RX, if it was before */
        if (channel->rx_enable)
                iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
}

static void ipoctal_hangup(struct tty_struct *tty)
{
        unsigned long flags;
        struct ipoctal_channel *channel = tty->driver_data;

        if (channel == NULL)
                return;

        spin_lock_irqsave(&channel->lock, flags);
        channel->nb_bytes = 0;
        channel->pointer_read = 0;
        channel->pointer_write = 0;
        spin_unlock_irqrestore(&channel->lock, flags);

        tty_port_hangup(&channel->tty_port);

        ipoctal_reset_channel(channel);
        tty_port_set_initialized(&channel->tty_port, false);
        wake_up_interruptible(&channel->tty_port.open_wait);
}

static void ipoctal_shutdown(struct tty_struct *tty)
{
        struct ipoctal_channel *channel = tty->driver_data;

        if (channel == NULL)
                return;

        ipoctal_reset_channel(channel);
        tty_port_set_initialized(&channel->tty_port, false);
}

static void ipoctal_cleanup(struct tty_struct *tty)
{
        struct ipoctal_channel *channel = tty->driver_data;
        struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index);

        /* release the carrier driver */
        ipack_put_carrier(ipoctal->dev);
}

static const struct tty_operations ipoctal_fops = {
        .ioctl =                NULL,
        .install =              ipoctal_install,
        .open =                 ipoctal_open,
        .close =                ipoctal_close,
        .write =                ipoctal_write_tty,
        .set_termios =          ipoctal_set_termios,
        .write_room =           ipoctal_write_room,
        .chars_in_buffer =      ipoctal_chars_in_buffer,
        .get_icount =           ipoctal_get_icount,
        .hangup =               ipoctal_hangup,
        .shutdown =             ipoctal_shutdown,
        .cleanup =              ipoctal_cleanup,
};

static int ipoctal_probe(struct ipack_device *dev)
{
        int res;
        struct ipoctal *ipoctal;

        ipoctal = kzalloc_obj(struct ipoctal);
        if (ipoctal == NULL)
                return -ENOMEM;

        ipoctal->dev = dev;
        res = ipoctal_inst_slot(ipoctal, dev->bus->bus_nr, dev->slot);
        if (res)
                goto out_uninst;

        dev_set_drvdata(&dev->dev, ipoctal);
        return 0;

out_uninst:
        kfree(ipoctal);
        return res;
}

static void __ipoctal_remove(struct ipoctal *ipoctal)
{
        int i;

        ipoctal->dev->bus->ops->free_irq(ipoctal->dev);

        for (i = 0; i < NR_CHANNELS; i++) {
                struct ipoctal_channel *channel = &ipoctal->channel[i];

                if (!channel->tty_registered)
                        continue;

                tty_unregister_device(ipoctal->tty_drv, i);
                tty_port_free_xmit_buf(&channel->tty_port);
                tty_port_destroy(&channel->tty_port);
        }

        tty_unregister_driver(ipoctal->tty_drv);
        kfree(ipoctal->tty_drv->name);
        tty_driver_kref_put(ipoctal->tty_drv);
        kfree(ipoctal);
}

static void ipoctal_remove(struct ipack_device *idev)
{
        __ipoctal_remove(dev_get_drvdata(&idev->dev));
}

static DEFINE_IPACK_DEVICE_TABLE(ipoctal_ids) = {
        { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
                        IPACK1_DEVICE_ID_SBS_OCTAL_232) },
        { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
                        IPACK1_DEVICE_ID_SBS_OCTAL_422) },
        { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS,
                        IPACK1_DEVICE_ID_SBS_OCTAL_485) },
        { 0, },
};

MODULE_DEVICE_TABLE(ipack, ipoctal_ids);

static const struct ipack_driver_ops ipoctal_drv_ops = {
        .probe  = ipoctal_probe,
        .remove = ipoctal_remove,
};

static struct ipack_driver driver = {
        .ops      = &ipoctal_drv_ops,
        .id_table = ipoctal_ids,
};

static int __init ipoctal_init(void)
{
        return ipack_driver_register(&driver, THIS_MODULE, KBUILD_MODNAME);
}

static void __exit ipoctal_exit(void)
{
        ipack_driver_unregister(&driver);
}

MODULE_DESCRIPTION("IP-Octal 232, 422 and 485 device driver");
MODULE_LICENSE("GPL");

module_init(ipoctal_init);
module_exit(ipoctal_exit);