/*
 * Blackfin Infra-red Driver
 *
 * Copyright 2006-2009 Analog Devices Inc.
 *
 * Enter bugs at http://blackfin.uclinux.org/
 *
 * Licensed under the GPL-2 or later.
 *
 */
#include "bfin_sir.h"

#ifdef CONFIG_SIR_BFIN_DMA
#define DMA_SIR_RX_XCNT        10
#define DMA_SIR_RX_YCNT        (PAGE_SIZE / DMA_SIR_RX_XCNT)
#define DMA_SIR_RX_FLUSH_JIFS  (HZ * 4 / 250)
#endif

#if ANOMALY_05000447
static int max_rate = 57600;
#else
static int max_rate = 115200;
#endif

static void turnaround_delay(int mtt)
{
        long ticks;

        mtt = mtt < 10000 ? 10000 : mtt;
        ticks = 1 + mtt / (USEC_PER_SEC / HZ);
        schedule_timeout_uninterruptible(ticks);
}

static void bfin_sir_init_ports(struct bfin_sir_port *sp, struct platform_device *pdev)
{
        int i;
        struct resource *res;

        for (i = 0; i < pdev->num_resources; i++) {
                res = &pdev->resource[i];
                switch (res->flags) {
                case IORESOURCE_MEM:
                        sp->membase   = (void __iomem *)res->start;
                        break;
                case IORESOURCE_IRQ:
                        sp->irq = res->start;
                        break;
                case IORESOURCE_DMA:
                        sp->rx_dma_channel = res->start;
                        sp->tx_dma_channel = res->end;
                        break;
                default:
                        break;
                }
        }

        sp->clk = get_sclk();
#ifdef CONFIG_SIR_BFIN_DMA
        sp->tx_done        = 1;
        init_timer(&(sp->rx_dma_timer));
#endif
}

static void bfin_sir_stop_tx(struct bfin_sir_port *port)
{
#ifdef CONFIG_SIR_BFIN_DMA
        disable_dma(port->tx_dma_channel);
#endif

        while (!(UART_GET_LSR(port) & THRE)) {
                cpu_relax();
                continue;
        }

        UART_CLEAR_IER(port, ETBEI);
}

static void bfin_sir_enable_tx(struct bfin_sir_port *port)
{
        UART_SET_IER(port, ETBEI);
}

static void bfin_sir_stop_rx(struct bfin_sir_port *port)
{
        UART_CLEAR_IER(port, ERBFI);
}

static void bfin_sir_enable_rx(struct bfin_sir_port *port)
{
        UART_SET_IER(port, ERBFI);
}

static int bfin_sir_set_speed(struct bfin_sir_port *port, int speed)
{
        int ret = -EINVAL;
        unsigned int quot;
        unsigned short val, lsr, lcr;
        static int utime;
        int count = 10;

        lcr = WLS(8);

        switch (speed) {
        case 9600:
        case 19200:
        case 38400:
        case 57600:
        case 115200:

                /*
                 * IRDA is not affected by anomaly 05000230, so there is no
                 * need to tweak the divisor like he UART driver (which will
                 * slightly speed up the baud rate on us).
                 */
                quot = (port->clk + (8 * speed)) / (16 * speed);

                do {
                        udelay(utime);
                        lsr = UART_GET_LSR(port);
                } while (!(lsr & TEMT) && count--);

                /* The useconds for 1 bits to transmit */
                utime = 1000000 / speed + 1;

                /* Clear UCEN bit to reset the UART state machine
                 * and control registers
                 */
                val = UART_GET_GCTL(port);
                val &= ~UCEN;
                UART_PUT_GCTL(port, val);

                /* Set DLAB in LCR to Access THR RBR IER */
                UART_SET_DLAB(port);
                SSYNC();

                UART_PUT_DLL(port, quot & 0xFF);
                UART_PUT_DLH(port, (quot >> 8) & 0xFF);
                SSYNC();

                /* Clear DLAB in LCR */
                UART_CLEAR_DLAB(port);
                SSYNC();

                UART_PUT_LCR(port, lcr);

                val = UART_GET_GCTL(port);
                val |= UCEN;
                UART_PUT_GCTL(port, val);

                ret = 0;
                break;
        default:
                printk(KERN_WARNING "bfin_sir: Invalid speed %d\n", speed);
                break;
        }

        val = UART_GET_GCTL(port);
        /* If not add the 'RPOLC', we can't catch the receive interrupt.
         * It's related with the HW layout and the IR transiver.
         */
        val |= UMOD_IRDA | RPOLC;
        UART_PUT_GCTL(port, val);
        return ret;
}

static int bfin_sir_is_receiving(struct net_device *dev)
{
        struct bfin_sir_self *self = netdev_priv(dev);
        struct bfin_sir_port *port = self->sir_port;

        if (!(UART_GET_IER(port) & ERBFI))
                return 0;
        return self->rx_buff.state != OUTSIDE_FRAME;
}

#ifdef CONFIG_SIR_BFIN_PIO
static void bfin_sir_tx_chars(struct net_device *dev)
{
        unsigned int chr;
        struct bfin_sir_self *self = netdev_priv(dev);
        struct bfin_sir_port *port = self->sir_port;

        if (self->tx_buff.len != 0) {
                chr = *(self->tx_buff.data);
                UART_PUT_CHAR(port, chr);
                self->tx_buff.data++;
                self->tx_buff.len--;
        } else {
                self->stats.tx_packets++;
                self->stats.tx_bytes += self->tx_buff.data - self->tx_buff.head;
                if (self->newspeed) {
                        bfin_sir_set_speed(port, self->newspeed);
                        self->speed = self->newspeed;
                        self->newspeed = 0;
                }
                bfin_sir_stop_tx(port);
                bfin_sir_enable_rx(port);
                /* I'm hungry! */
                netif_wake_queue(dev);
        }
}

static void bfin_sir_rx_chars(struct net_device *dev)
{
        struct bfin_sir_self *self = netdev_priv(dev);
        struct bfin_sir_port *port = self->sir_port;
        unsigned char ch;

        UART_CLEAR_LSR(port);
        ch = UART_GET_CHAR(port);
        async_unwrap_char(dev, &self->stats, &self->rx_buff, ch);
}

static irqreturn_t bfin_sir_rx_int(int irq, void *dev_id)
{
        struct net_device *dev = dev_id;
        struct bfin_sir_self *self = netdev_priv(dev);
        struct bfin_sir_port *port = self->sir_port;

        spin_lock(&self->lock);
        while ((UART_GET_LSR(port) & DR))
                bfin_sir_rx_chars(dev);
        spin_unlock(&self->lock);

        return IRQ_HANDLED;
}

static irqreturn_t bfin_sir_tx_int(int irq, void *dev_id)
{
        struct net_device *dev = dev_id;
        struct bfin_sir_self *self = netdev_priv(dev);
        struct bfin_sir_port *port = self->sir_port;

        spin_lock(&self->lock);
        if (UART_GET_LSR(port) & THRE)
                bfin_sir_tx_chars(dev);
        spin_unlock(&self->lock);

        return IRQ_HANDLED;
}
#endif /* CONFIG_SIR_BFIN_PIO */

#ifdef CONFIG_SIR_BFIN_DMA
static void bfin_sir_dma_tx_chars(struct net_device *dev)
{
        struct bfin_sir_self *self = netdev_priv(dev);
        struct bfin_sir_port *port = self->sir_port;

        if (!port->tx_done)
                return;
        port->tx_done = 0;

        if (self->tx_buff.len == 0) {
                self->stats.tx_packets++;
                if (self->newspeed) {
                        bfin_sir_set_speed(port, self->newspeed);
                        self->speed = self->newspeed;
                        self->newspeed = 0;
                }
                bfin_sir_enable_rx(port);
                port->tx_done = 1;
                netif_wake_queue(dev);
                return;
        }

        blackfin_dcache_flush_range((unsigned long)(self->tx_buff.data),
                (unsigned long)(self->tx_buff.data+self->tx_buff.len));
        set_dma_config(port->tx_dma_channel,
                set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
                        INTR_ON_BUF, DIMENSION_LINEAR, DATA_SIZE_8,
                        DMA_SYNC_RESTART));
        set_dma_start_addr(port->tx_dma_channel,
                (unsigned long)(self->tx_buff.data));
        set_dma_x_count(port->tx_dma_channel, self->tx_buff.len);
        set_dma_x_modify(port->tx_dma_channel, 1);
        enable_dma(port->tx_dma_channel);
}

static irqreturn_t bfin_sir_dma_tx_int(int irq, void *dev_id)
{
        struct net_device *dev = dev_id;
        struct bfin_sir_self *self = netdev_priv(dev);
        struct bfin_sir_port *port = self->sir_port;

        spin_lock(&self->lock);
        if (!(get_dma_curr_irqstat(port->tx_dma_channel) & DMA_RUN)) {
                clear_dma_irqstat(port->tx_dma_channel);
                bfin_sir_stop_tx(port);

                self->stats.tx_packets++;
                self->stats.tx_bytes += self->tx_buff.len;
                self->tx_buff.len = 0;
                if (self->newspeed) {
                        bfin_sir_set_speed(port, self->newspeed);
                        self->speed = self->newspeed;
                        self->newspeed = 0;
                }
                bfin_sir_enable_rx(port);
                /* I'm hungry! */
                netif_wake_queue(dev);
                port->tx_done = 1;
        }
        spin_unlock(&self->lock);

        return IRQ_HANDLED;
}

static void bfin_sir_dma_rx_chars(struct net_device *dev)
{
        struct bfin_sir_self *self = netdev_priv(dev);
        struct bfin_sir_port *port = self->sir_port;
        int i;

        UART_CLEAR_LSR(port);

        for (i = port->rx_dma_buf.head; i < port->rx_dma_buf.tail; i++)
                async_unwrap_char(dev, &self->stats, &self->rx_buff, port->rx_dma_buf.buf[i]);
}

void bfin_sir_rx_dma_timeout(struct net_device *dev)
{
        struct bfin_sir_self *self = netdev_priv(dev);
        struct bfin_sir_port *port = self->sir_port;
        int x_pos, pos;
        unsigned long flags;

        spin_lock_irqsave(&self->lock, flags);
        x_pos = DMA_SIR_RX_XCNT - get_dma_curr_xcount(port->rx_dma_channel);
        if (x_pos == DMA_SIR_RX_XCNT)
                x_pos = 0;

        pos = port->rx_dma_nrows * DMA_SIR_RX_XCNT + x_pos;

        if (pos > port->rx_dma_buf.tail) {
                port->rx_dma_buf.tail = pos;
                bfin_sir_dma_rx_chars(dev);
                port->rx_dma_buf.head = port->rx_dma_buf.tail;
        }
        spin_unlock_irqrestore(&self->lock, flags);
}

static irqreturn_t bfin_sir_dma_rx_int(int irq, void *dev_id)
{
        struct net_device *dev = dev_id;
        struct bfin_sir_self *self = netdev_priv(dev);
        struct bfin_sir_port *port = self->sir_port;
        unsigned short irqstat;

        spin_lock(&self->lock);

        port->rx_dma_nrows++;
        port->rx_dma_buf.tail = DMA_SIR_RX_XCNT * port->rx_dma_nrows;
        bfin_sir_dma_rx_chars(dev);
        if (port->rx_dma_nrows >= DMA_SIR_RX_YCNT) {
                port->rx_dma_nrows = 0;
                port->rx_dma_buf.tail = 0;
        }
        port->rx_dma_buf.head = port->rx_dma_buf.tail;

        irqstat = get_dma_curr_irqstat(port->rx_dma_channel);
        clear_dma_irqstat(port->rx_dma_channel);
        spin_unlock(&self->lock);

        mod_timer(&port->rx_dma_timer, jiffies + DMA_SIR_RX_FLUSH_JIFS);
        return IRQ_HANDLED;
}
#endif /* CONFIG_SIR_BFIN_DMA */

static int bfin_sir_startup(struct bfin_sir_port *port, struct net_device *dev)
{
#ifdef CONFIG_SIR_BFIN_DMA
        dma_addr_t dma_handle;
#endif /* CONFIG_SIR_BFIN_DMA */

        if (request_dma(port->rx_dma_channel, "BFIN_UART_RX") < 0) {
                dev_warn(&dev->dev, "Unable to attach SIR RX DMA channel\n");
                return -EBUSY;
        }

        if (request_dma(port->tx_dma_channel, "BFIN_UART_TX") < 0) {
                dev_warn(&dev->dev, "Unable to attach SIR TX DMA channel\n");
                free_dma(port->rx_dma_channel);
                return -EBUSY;
        }

#ifdef CONFIG_SIR_BFIN_DMA

        set_dma_callback(port->rx_dma_channel, bfin_sir_dma_rx_int, dev);
        set_dma_callback(port->tx_dma_channel, bfin_sir_dma_tx_int, dev);

        port->rx_dma_buf.buf = dma_alloc_coherent(NULL, PAGE_SIZE,
                                                  &dma_handle, GFP_DMA);
        port->rx_dma_buf.head = 0;
        port->rx_dma_buf.tail = 0;
        port->rx_dma_nrows = 0;

        set_dma_config(port->rx_dma_channel,
                                set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
                                                                        INTR_ON_ROW, DIMENSION_2D,
                                                                        DATA_SIZE_8, DMA_SYNC_RESTART));
        set_dma_x_count(port->rx_dma_channel, DMA_SIR_RX_XCNT);
        set_dma_x_modify(port->rx_dma_channel, 1);
        set_dma_y_count(port->rx_dma_channel, DMA_SIR_RX_YCNT);
        set_dma_y_modify(port->rx_dma_channel, 1);
        set_dma_start_addr(port->rx_dma_channel, (unsigned long)port->rx_dma_buf.buf);
        enable_dma(port->rx_dma_channel);

        port->rx_dma_timer.data = (unsigned long)(dev);
        port->rx_dma_timer.function = (void *)bfin_sir_rx_dma_timeout;

#else

        if (request_irq(port->irq, bfin_sir_rx_int, IRQF_DISABLED, "BFIN_SIR_RX", dev)) {
                dev_warn(&dev->dev, "Unable to attach SIR RX interrupt\n");
                return -EBUSY;
        }

        if (request_irq(port->irq+1, bfin_sir_tx_int, IRQF_DISABLED, "BFIN_SIR_TX", dev)) {
                dev_warn(&dev->dev, "Unable to attach SIR TX interrupt\n");
                free_irq(port->irq, dev);
                return -EBUSY;
        }
#endif

        return 0;
}

static void bfin_sir_shutdown(struct bfin_sir_port *port, struct net_device *dev)
{
        unsigned short val;

        bfin_sir_stop_rx(port);

        val = UART_GET_GCTL(port);
        val &= ~(UCEN | UMOD_MASK | RPOLC);
        UART_PUT_GCTL(port, val);

#ifdef CONFIG_SIR_BFIN_DMA
        disable_dma(port->tx_dma_channel);
        disable_dma(port->rx_dma_channel);
        del_timer(&(port->rx_dma_timer));
        dma_free_coherent(NULL, PAGE_SIZE, port->rx_dma_buf.buf, 0);
#else
        free_irq(port->irq+1, dev);
        free_irq(port->irq, dev);
#endif
        free_dma(port->tx_dma_channel);
        free_dma(port->rx_dma_channel);
}

#ifdef CONFIG_PM
static int bfin_sir_suspend(struct platform_device *pdev, pm_message_t state)
{
        struct bfin_sir_port *sir_port;
        struct net_device *dev;
        struct bfin_sir_self *self;

        sir_port = platform_get_drvdata(pdev);
        if (!sir_port)
                return 0;

        dev = sir_port->dev;
        self = netdev_priv(dev);
        if (self->open) {
                flush_work(&self->work);
                bfin_sir_shutdown(self->sir_port, dev);
                netif_device_detach(dev);
        }

        return 0;
}
static int bfin_sir_resume(struct platform_device *pdev)
{
        struct bfin_sir_port *sir_port;
        struct net_device *dev;
        struct bfin_sir_self *self;
        struct bfin_sir_port *port;

        sir_port = platform_get_drvdata(pdev);
        if (!sir_port)
                return 0;

        dev = sir_port->dev;
        self = netdev_priv(dev);
        port = self->sir_port;
        if (self->open) {
                if (self->newspeed) {
                        self->speed = self->newspeed;
                        self->newspeed = 0;
                }
                bfin_sir_startup(port, dev);
                bfin_sir_set_speed(port, 9600);
                bfin_sir_enable_rx(port);
                netif_device_attach(dev);
        }
        return 0;
}
#else
#define bfin_sir_suspend   NULL
#define bfin_sir_resume    NULL
#endif

static void bfin_sir_send_work(struct work_struct *work)
{
        struct bfin_sir_self  *self = container_of(work, struct bfin_sir_self, work);
        struct net_device *dev = self->sir_port->dev;
        struct bfin_sir_port *port = self->sir_port;
        unsigned short val;
        int tx_cnt = 10;

        while (bfin_sir_is_receiving(dev) && --tx_cnt)
                turnaround_delay(self->mtt);

        bfin_sir_stop_rx(port);

        /* To avoid losting RX interrupt, we reset IR function before
         * sending data. We also can set the speed, which will
         * reset all the UART.
         */
        val = UART_GET_GCTL(port);
        val &= ~(UMOD_MASK | RPOLC);
        UART_PUT_GCTL(port, val);
        SSYNC();
        val |= UMOD_IRDA | RPOLC;
        UART_PUT_GCTL(port, val);
        SSYNC();
        /* bfin_sir_set_speed(port, self->speed); */

#ifdef CONFIG_SIR_BFIN_DMA
        bfin_sir_dma_tx_chars(dev);
#endif
        bfin_sir_enable_tx(port);
        netif_trans_update(dev);
}

static int bfin_sir_hard_xmit(struct sk_buff *skb, struct net_device *dev)
{
        struct bfin_sir_self *self = netdev_priv(dev);
        int speed = irda_get_next_speed(skb);

        netif_stop_queue(dev);

        self->mtt = irda_get_mtt(skb);

        if (speed != self->speed && speed != -1)
                self->newspeed = speed;

        self->tx_buff.data = self->tx_buff.head;
        if (skb->len == 0)
                self->tx_buff.len = 0;
        else
                self->tx_buff.len = async_wrap_skb(skb, self->tx_buff.data, self->tx_buff.truesize);

        schedule_work(&self->work);
        dev_kfree_skb(skb);

        return 0;
}

static int bfin_sir_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
{
        struct if_irda_req *rq = (struct if_irda_req *)ifreq;
        struct bfin_sir_self *self = netdev_priv(dev);
        struct bfin_sir_port *port = self->sir_port;
        int ret = 0;

        switch (cmd) {
        case SIOCSBANDWIDTH:
                if (capable(CAP_NET_ADMIN)) {
                        if (self->open) {
                                ret = bfin_sir_set_speed(port, rq->ifr_baudrate);
                                bfin_sir_enable_rx(port);
                        } else {
                                dev_warn(&dev->dev, "SIOCSBANDWIDTH: !netif_running\n");
                                ret = 0;
                        }
                }
                break;

        case SIOCSMEDIABUSY:
                ret = -EPERM;
                if (capable(CAP_NET_ADMIN)) {
                        irda_device_set_media_busy(dev, TRUE);
                        ret = 0;
                }
                break;

        case SIOCGRECEIVING:
                rq->ifr_receiving = bfin_sir_is_receiving(dev);
                break;

        default:
                ret = -EOPNOTSUPP;
                break;
        }

        return ret;
}

static struct net_device_stats *bfin_sir_stats(struct net_device *dev)
{
        struct bfin_sir_self *self = netdev_priv(dev);

        return &self->stats;
}

static int bfin_sir_open(struct net_device *dev)
{
        struct bfin_sir_self *self = netdev_priv(dev);
        struct bfin_sir_port *port = self->sir_port;
        int err;

        self->newspeed = 0;
        self->speed = 9600;

        spin_lock_init(&self->lock);

        err = bfin_sir_startup(port, dev);
        if (err)
                goto err_startup;

        bfin_sir_set_speed(port, 9600);

        self->irlap = irlap_open(dev, &self->qos, DRIVER_NAME);
        if (!self->irlap) {
                err = -ENOMEM;
                goto err_irlap;
        }

        INIT_WORK(&self->work, bfin_sir_send_work);

        /*
         * Now enable the interrupt then start the queue
         */
        self->open = 1;
        bfin_sir_enable_rx(port);

        netif_start_queue(dev);

        return 0;

err_irlap:
        self->open = 0;
        bfin_sir_shutdown(port, dev);
err_startup:
        return err;
}

static int bfin_sir_stop(struct net_device *dev)
{
        struct bfin_sir_self *self = netdev_priv(dev);

        flush_work(&self->work);
        bfin_sir_shutdown(self->sir_port, dev);

        if (self->rxskb) {
                dev_kfree_skb(self->rxskb);
                self->rxskb = NULL;
        }

        /* Stop IrLAP */
        if (self->irlap) {
                irlap_close(self->irlap);
                self->irlap = NULL;
        }

        netif_stop_queue(dev);
        self->open = 0;

        return 0;
}

static int bfin_sir_init_iobuf(iobuff_t *io, int size)
{
        io->head = kmalloc(size, GFP_KERNEL);
        if (!io->head)
                return -ENOMEM;
        io->truesize = size;
        io->in_frame = FALSE;
        io->state    = OUTSIDE_FRAME;
        io->data     = io->head;
        return 0;
}

static const struct net_device_ops bfin_sir_ndo = {
        .ndo_open               = bfin_sir_open,
        .ndo_stop               = bfin_sir_stop,
        .ndo_start_xmit         = bfin_sir_hard_xmit,
        .ndo_do_ioctl           = bfin_sir_ioctl,
        .ndo_get_stats          = bfin_sir_stats,
};

static int bfin_sir_probe(struct platform_device *pdev)
{
        struct net_device *dev;
        struct bfin_sir_self *self;
        unsigned int baudrate_mask;
        struct bfin_sir_port *sir_port;
        int err;

        if (pdev->id >= 0 && pdev->id < ARRAY_SIZE(per) && \
                                per[pdev->id][3] == pdev->id) {
                err = peripheral_request_list(per[pdev->id], DRIVER_NAME);
                if (err)
                        return err;
        } else {
                dev_err(&pdev->dev, "Invalid pdev id, please check board file\n");
                return -ENODEV;
        }

        err = -ENOMEM;
        sir_port = kmalloc(sizeof(*sir_port), GFP_KERNEL);
        if (!sir_port)
                goto err_mem_0;

        bfin_sir_init_ports(sir_port, pdev);

        dev = alloc_irdadev(sizeof(*self));
        if (!dev)
                goto err_mem_1;

        self = netdev_priv(dev);
        self->dev = &pdev->dev;
        self->sir_port = sir_port;
        sir_port->dev = dev;

        err = bfin_sir_init_iobuf(&self->rx_buff, IRDA_SKB_MAX_MTU);
        if (err)
                goto err_mem_2;
        err = bfin_sir_init_iobuf(&self->tx_buff, IRDA_SIR_MAX_FRAME);
        if (err)
                goto err_mem_3;

        dev->netdev_ops = &bfin_sir_ndo;
        dev->irq = sir_port->irq;

        irda_init_max_qos_capabilies(&self->qos);

        baudrate_mask = IR_9600;

        switch (max_rate) {
        case 115200:
                baudrate_mask |= IR_115200;
        case 57600:
                baudrate_mask |= IR_57600;
        case 38400:
                baudrate_mask |= IR_38400;
        case 19200:
                baudrate_mask |= IR_19200;
        case 9600:
                break;
        default:
                dev_warn(&pdev->dev, "Invalid maximum baud rate, using 9600\n");
        }

        self->qos.baud_rate.bits &= baudrate_mask;

        self->qos.min_turn_time.bits = 1; /* 10 ms or more */

        irda_qos_bits_to_value(&self->qos);

        err = register_netdev(dev);

        if (err) {
                kfree(self->tx_buff.head);
err_mem_3:
                kfree(self->rx_buff.head);
err_mem_2:
                free_netdev(dev);
err_mem_1:
                kfree(sir_port);
err_mem_0:
                peripheral_free_list(per[pdev->id]);
        } else
                platform_set_drvdata(pdev, sir_port);

        return err;
}

static int bfin_sir_remove(struct platform_device *pdev)
{
        struct bfin_sir_port *sir_port;
        struct net_device *dev = NULL;
        struct bfin_sir_self *self;

        sir_port = platform_get_drvdata(pdev);
        if (!sir_port)
                return 0;
        dev = sir_port->dev;
        self = netdev_priv(dev);
        unregister_netdev(dev);
        kfree(self->tx_buff.head);
        kfree(self->rx_buff.head);
        free_netdev(dev);
        kfree(sir_port);
        platform_set_drvdata(pdev, NULL);

        return 0;
}

static struct platform_driver bfin_ir_driver = {
        .probe   = bfin_sir_probe,
        .remove  = bfin_sir_remove,
        .suspend = bfin_sir_suspend,
        .resume  = bfin_sir_resume,
        .driver  = {
                .name = DRIVER_NAME,
        },
};

module_platform_driver(bfin_ir_driver);

module_param(max_rate, int, 0);
MODULE_PARM_DESC(max_rate, "Maximum baud rate (115200, 57600, 38400, 19200, 9600)");

MODULE_AUTHOR("Graf Yang <graf.yang@analog.com>");
MODULE_DESCRIPTION("Blackfin IrDA driver");
MODULE_LICENSE("GPL");