Staging: ipack: move out of staging

The ipack subsystem is cleaned up enough to now move out of the staging
tree, and into drivers/ipack.

Cc: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Cc: Jens Taprogge <jens.taprogge@taprogge.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 751 insertions, 0 deletions

diff --git a/drivers/ipack/devices/ipoctal.c b/drivers/ipack/devices/ipoctal.c
new file mode 100644
index 000000000000..783f120338d1
--- /dev/null
+++ b/drivers/ipack/devices/ipoctal.c
@@ -0,0 +1,751 @@
+/**
+ * ipoctal.c
+ *
+ * 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>
+ *
+ * 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; version 2 of the License.
+ */
+
+#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/atomic.h>
+#include <linux/io.h>
+#include "../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;
+        atomic_t                        open;
+        struct tty_port                 tty_port;
+        union scc2698_channel __iomem   *regs;
+        union scc2698_block __iomem     *block_regs;
+        unsigned int                    board_id;
+        unsigned char                   *board_write;
+        u8                              isr_rx_rdy_mask;
+        u8                              isr_tx_rdy_mask;
+};
+
+struct ipoctal {
+        struct ipack_device             *dev;
+        unsigned int                    board_id;
+        struct ipoctal_channel          channel[NR_CHANNELS];
+        unsigned char                   write;
+        struct tty_driver               *tty_drv;
+        u8 __iomem                      *mem8_space;
+        u8 __iomem                      *int_space;
+};
+
+static int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty)
+{
+        struct ipoctal_channel *channel;
+
+        channel = dev_get_drvdata(tty->dev);
+
+        iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
+        return 0;
+}
+
+static int ipoctal_open(struct tty_struct *tty, struct file *file)
+{
+        int res;
+        struct ipoctal_channel *channel;
+
+        channel = dev_get_drvdata(tty->dev);
+
+        if (atomic_read(&channel->open))
+                return -EBUSY;
+
+        tty->driver_data = channel;
+
+        res = tty_port_open(&channel->tty_port, tty, file);
+        if (res)
+                return res;
+
+        atomic_inc(&channel->open);
+        return 0;
+}
+
+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);
+
+        if (atomic_dec_and_test(&channel->open))
+                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,
+                           struct tty_struct *tty, u8 sr)
+{
+        unsigned char value;
+        unsigned char flag = TTY_NORMAL;
+        u8 isr;
+
+        do {
+                value = ioread8(&channel->regs->r.rhr);
+                /* 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(tty, 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) {
+                                iowrite8(CR_CMD_RESET_BREAK_CHANGE, &channel->regs->w.cr);
+                                channel->stats.rcv_break++;
+                                flag = TTY_BREAK;
+                        }
+                }
+                tty_insert_flip_char(tty, 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(tty);
+}
+
+static void ipoctal_irq_tx(struct ipoctal_channel *channel)
+{
+        unsigned char value;
+        unsigned int *pointer_write = &channel->pointer_write;
+
+        if (channel->nb_bytes <= 0) {
+                channel->nb_bytes = 0;
+                return;
+        }
+
+        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--;
+
+        if ((channel->nb_bytes == 0) &&
+            (waitqueue_active(&channel->queue))) {
+
+                if (channel->board_id != IPACK1_DEVICE_ID_SBS_OCTAL_485) {
+                        *channel->board_write = 1;
+                        wake_up_interruptible(&channel->queue);
+                }
+        }
+}
+
+static void ipoctal_irq_channel(struct ipoctal_channel *channel)
+{
+        u8 isr, sr;
+        struct tty_struct *tty;
+
+        /* If there is no client, skip the check */
+        if (!atomic_read(&channel->open))
+                return;
+
+        tty = tty_port_tty_get(&channel->tty_port);
+        if (!tty)
+                return;
+        /* 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);
+
+        /* 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) &&
+            (sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) {
+                iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
+                iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr);
+                iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
+                *channel->board_write = 1;
+                wake_up_interruptible(&channel->queue);
+        }
+
+        /* RX data */
+        if ((isr & channel->isr_rx_rdy_mask) && (sr & SR_RX_READY))
+                ipoctal_irq_rx(channel, tty, sr);
+
+        /* TX of each character */
+        if ((isr & channel->isr_tx_rdy_mask) && (sr & SR_TX_READY))
+                ipoctal_irq_tx(channel);
+
+        tty_flip_buffer_push(tty);
+        tty_kref_put(tty);
+}
+
+static irqreturn_t ipoctal_irq_handler(void *arg)
+{
+        unsigned int i;
+        struct ipoctal *ipoctal = (struct ipoctal *) arg;
+
+        /* Check all channels */
+        for (i = 0; i < NR_CHANNELS; i++)
+                ipoctal_irq_channel(&ipoctal->channel[i]);
+
+        /* Clear the IPack device interrupt */
+        readw(ipoctal->int_space + ACK_INT_REQ0);
+        readw(ipoctal->int_space + ACK_INT_REQ1);
+
+        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 *tty;
+        char name[20];
+        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_nocache(&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_nocache(&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_nocache(&ipoctal->dev->dev,
+                                     region->start, 0x8000);
+        if (!addr) {
+                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_write = &ipoctal->write;
+                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;
+                }
+
+                iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
+                iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr);
+                iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr);
+                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);
+        }
+
+        /*
+         * 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);
+        /* Dummy write */
+        iowrite8(1, ipoctal->mem8_space + 1);
+
+        /* Register the TTY device */
+
+        /* Each IP-OCTAL channel is a TTY port */
+        tty = alloc_tty_driver(NR_CHANNELS);
+
+        if (!tty)
+                return -ENOMEM;
+
+        /* Fill struct tty_driver with ipoctal data */
+        tty->owner = THIS_MODULE;
+        tty->driver_name = KBUILD_MODNAME;
+        sprintf(name, KBUILD_MODNAME ".%d.%d.", bus_nr, slot);
+        tty->name = name;
+        tty->major = 0;
+
+        tty->minor_start = 0;
+        tty->type = TTY_DRIVER_TYPE_SERIAL;
+        tty->subtype = SERIAL_TYPE_NORMAL;
+        tty->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+        tty->init_termios = tty_std_termios;
+        tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+        tty->init_termios.c_ispeed = 9600;
+        tty->init_termios.c_ospeed = 9600;
+
+        tty_set_operations(tty, &ipoctal_fops);
+        res = tty_register_driver(tty);
+        if (res) {
+                dev_err(&ipoctal->dev->dev, "Can't register tty driver.\n");
+                put_tty_driver(tty);
+                return res;
+        }
+
+        /* Save struct tty_driver for use it when uninstalling the device */
+        ipoctal->tty_drv = tty;
+
+        for (i = 0; i < NR_CHANNELS; i++) {
+                struct device *tty_dev;
+
+                channel = &ipoctal->channel[i];
+                tty_port_init(&channel->tty_port);
+                tty_port_alloc_xmit_buf(&channel->tty_port);
+                channel->tty_port.ops = &ipoctal_tty_port_ops;
+
+                ipoctal_reset_stats(&channel->stats);
+                channel->nb_bytes = 0;
+                init_waitqueue_head(&channel->queue);
+
+                spin_lock_init(&channel->lock);
+                channel->pointer_read = 0;
+                channel->pointer_write = 0;
+                tty_dev = tty_port_register_device(&channel->tty_port, tty, i, NULL);
+                if (IS_ERR(tty_dev)) {
+                        dev_err(&ipoctal->dev->dev, "Failed to register tty device.\n");
+                        continue;
+                }
+                dev_set_drvdata(tty_dev, channel);
+
+                /*
+                 * Enable again the RX. TX will be enabled when
+                 * there is something to send
+                 */
+                iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
+        }
+
+        return 0;
+}
+
+static inline int ipoctal_copy_write_buffer(struct ipoctal_channel *channel,
+                                            const unsigned char *buf,
+                                            int count)
+{
+        unsigned long flags;
+        int 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 int ipoctal_write_tty(struct tty_struct *tty,
+                             const unsigned char *buf, int count)
+{
+        struct ipoctal_channel *channel = tty->driver_data;
+        unsigned int 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);
+                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);
+        wait_event_interruptible(channel->queue, *channel->board_write);
+        iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
+
+        *channel->board_write = 0;
+        return char_copied;
+}
+
+static int ipoctal_write_room(struct tty_struct *tty)
+{
+        struct ipoctal_channel *channel = tty->driver_data;
+
+        return PAGE_SIZE - channel->nb_bytes;
+}
+
+static 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,
+                                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 */
+        iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
+        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);
+
+        /* 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;
+                break;
+        }
+
+        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 */
+        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);
+
+        iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr);
+        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);
+
+        clear_bit(ASYNCB_INITIALIZED, &channel->tty_port.flags);
+        wake_up_interruptible(&channel->tty_port.open_wait);
+}
+
+static const struct tty_operations ipoctal_fops = {
+        .ioctl =                NULL,
+        .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,
+};
+
+static int ipoctal_probe(struct ipack_device *dev)
+{
+        int res;
+        struct ipoctal *ipoctal;
+
+        ipoctal = kzalloc(sizeof(struct ipoctal), GFP_KERNEL);
+        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];
+                tty_unregister_device(ipoctal->tty_drv, i);
+                tty_port_free_xmit_buf(&channel->tty_port);
+        }
+
+        tty_unregister_driver(ipoctal->tty_drv);
+        put_tty_driver(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);