![Bjorn Helgaas](/assets/img/avatar_default.png)
Several IR drivers used "for (i = 0; i < 4; i++)" to walk their dev_self[] table. Better to use ARRAY_SIZE(). And fix ali-ircc so it won't run off the end if we find too many adapters. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
1133 lines
29 KiB
C
1133 lines
29 KiB
C
/*********************************************************************
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*
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* Filename: irport.c
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* Version: 1.0
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* Description: Half duplex serial port SIR driver for IrDA.
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* Status: Experimental.
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* Author: Dag Brattli <dagb@cs.uit.no>
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* Created at: Sun Aug 3 13:49:59 1997
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* Modified at: Fri Jan 28 20:22:38 2000
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* Modified by: Dag Brattli <dagb@cs.uit.no>
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* Sources: serial.c by Linus Torvalds
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*
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* Copyright (c) 1997, 1998, 1999-2000 Dag Brattli, All Rights Reserved.
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* Copyright (c) 2000-2003 Jean Tourrilhes, All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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* This driver is ment to be a small half duplex serial driver to be
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* used for IR-chipsets that has a UART (16550) compatibility mode.
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* Eventually it will replace irtty, because of irtty has some
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* problems that is hard to get around when we don't have control
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* over the serial driver. This driver may also be used by FIR
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* drivers to handle SIR mode for them.
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*
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********************************************************************/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/ioport.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/skbuff.h>
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#include <linux/serial_reg.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/delay.h>
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#include <linux/rtnetlink.h>
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#include <linux/bitops.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <net/irda/irda.h>
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#include <net/irda/wrapper.h>
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#include "irport.h"
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#define IO_EXTENT 8
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/*
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* Currently you'll need to set these values using insmod like this:
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* insmod irport io=0x3e8 irq=11
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*/
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static unsigned int io[] = { ~0, ~0, ~0, ~0 };
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static unsigned int irq[] = { 0, 0, 0, 0 };
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static unsigned int qos_mtt_bits = 0x03;
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static struct irport_cb *dev_self[] = { NULL, NULL, NULL, NULL};
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static char *driver_name = "irport";
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static inline void irport_write_wakeup(struct irport_cb *self);
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static inline int irport_write(int iobase, int fifo_size, __u8 *buf, int len);
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static inline void irport_receive(struct irport_cb *self);
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static int irport_net_ioctl(struct net_device *dev, struct ifreq *rq,
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int cmd);
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static inline int irport_is_receiving(struct irport_cb *self);
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static int irport_set_dtr_rts(struct net_device *dev, int dtr, int rts);
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static int irport_raw_write(struct net_device *dev, __u8 *buf, int len);
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static struct net_device_stats *irport_net_get_stats(struct net_device *dev);
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static int irport_change_speed_complete(struct irda_task *task);
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static void irport_timeout(struct net_device *dev);
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static irqreturn_t irport_interrupt(int irq, void *dev_id,
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struct pt_regs *regs);
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static int irport_hard_xmit(struct sk_buff *skb, struct net_device *dev);
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static void irport_change_speed(void *priv, __u32 speed);
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static int irport_net_open(struct net_device *dev);
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static int irport_net_close(struct net_device *dev);
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static struct irport_cb *
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irport_open(int i, unsigned int iobase, unsigned int irq)
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{
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struct net_device *dev;
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struct irport_cb *self;
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IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
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/* Lock the port that we need */
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if (!request_region(iobase, IO_EXTENT, driver_name)) {
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IRDA_DEBUG(0, "%s(), can't get iobase of 0x%03x\n",
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__FUNCTION__, iobase);
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goto err_out1;
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}
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/*
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* Allocate new instance of the driver
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*/
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dev = alloc_irdadev(sizeof(struct irport_cb));
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if (!dev) {
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IRDA_ERROR("%s(), can't allocate memory for "
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"irda device!\n", __FUNCTION__);
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goto err_out2;
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}
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self = dev->priv;
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spin_lock_init(&self->lock);
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/* Need to store self somewhere */
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dev_self[i] = self;
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self->priv = self;
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self->index = i;
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/* Initialize IO */
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self->io.sir_base = iobase;
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self->io.sir_ext = IO_EXTENT;
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self->io.irq = irq;
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self->io.fifo_size = 16; /* 16550A and compatible */
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/* Initialize QoS for this device */
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irda_init_max_qos_capabilies(&self->qos);
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self->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|
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IR_115200;
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self->qos.min_turn_time.bits = qos_mtt_bits;
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irda_qos_bits_to_value(&self->qos);
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/* Bootstrap ZeroCopy Rx */
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self->rx_buff.truesize = IRDA_SKB_MAX_MTU;
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self->rx_buff.skb = __dev_alloc_skb(self->rx_buff.truesize,
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GFP_KERNEL);
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if (self->rx_buff.skb == NULL) {
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IRDA_ERROR("%s(), can't allocate memory for "
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"receive buffer!\n", __FUNCTION__);
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goto err_out3;
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}
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skb_reserve(self->rx_buff.skb, 1);
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self->rx_buff.head = self->rx_buff.skb->data;
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/* No need to memset the buffer, unless you are really pedantic */
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/* Finish setup the Rx buffer descriptor */
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self->rx_buff.in_frame = FALSE;
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self->rx_buff.state = OUTSIDE_FRAME;
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self->rx_buff.data = self->rx_buff.head;
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/* Specify how much memory we want */
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self->tx_buff.truesize = 4000;
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/* Allocate memory if needed */
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if (self->tx_buff.truesize > 0) {
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self->tx_buff.head = (__u8 *) kmalloc(self->tx_buff.truesize,
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GFP_KERNEL);
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if (self->tx_buff.head == NULL) {
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IRDA_ERROR("%s(), can't allocate memory for "
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"transmit buffer!\n", __FUNCTION__);
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goto err_out4;
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}
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memset(self->tx_buff.head, 0, self->tx_buff.truesize);
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}
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self->tx_buff.data = self->tx_buff.head;
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self->netdev = dev;
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/* Keep track of module usage */
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SET_MODULE_OWNER(dev);
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/* May be overridden by piggyback drivers */
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self->interrupt = irport_interrupt;
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self->change_speed = irport_change_speed;
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/* Override the network functions we need to use */
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dev->hard_start_xmit = irport_hard_xmit;
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dev->tx_timeout = irport_timeout;
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dev->watchdog_timeo = HZ; /* Allow time enough for speed change */
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dev->open = irport_net_open;
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dev->stop = irport_net_close;
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dev->get_stats = irport_net_get_stats;
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dev->do_ioctl = irport_net_ioctl;
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/* Make ifconfig display some details */
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dev->base_addr = iobase;
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dev->irq = irq;
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if (register_netdev(dev)) {
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IRDA_ERROR("%s(), register_netdev() failed!\n", __FUNCTION__);
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goto err_out5;
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}
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IRDA_MESSAGE("IrDA: Registered device %s (irport io=0x%X irq=%d)\n",
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dev->name, iobase, irq);
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return self;
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err_out5:
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kfree(self->tx_buff.head);
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err_out4:
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kfree_skb(self->rx_buff.skb);
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err_out3:
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free_netdev(dev);
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dev_self[i] = NULL;
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err_out2:
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release_region(iobase, IO_EXTENT);
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err_out1:
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return NULL;
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}
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static int irport_close(struct irport_cb *self)
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{
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IRDA_ASSERT(self != NULL, return -1;);
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/* We are not using any dongle anymore! */
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if (self->dongle)
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irda_device_dongle_cleanup(self->dongle);
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self->dongle = NULL;
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/* Remove netdevice */
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unregister_netdev(self->netdev);
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/* Release the IO-port that this driver is using */
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IRDA_DEBUG(0 , "%s(), Releasing Region %03x\n",
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__FUNCTION__, self->io.sir_base);
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release_region(self->io.sir_base, self->io.sir_ext);
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kfree(self->tx_buff.head);
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if (self->rx_buff.skb)
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kfree_skb(self->rx_buff.skb);
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self->rx_buff.skb = NULL;
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/* Remove ourselves */
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dev_self[self->index] = NULL;
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free_netdev(self->netdev);
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return 0;
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}
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static void irport_stop(struct irport_cb *self)
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{
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int iobase;
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iobase = self->io.sir_base;
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/* We can't lock, we may be called from a FIR driver - Jean II */
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/* We are not transmitting any more */
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self->transmitting = 0;
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/* Reset UART */
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outb(0, iobase+UART_MCR);
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/* Turn off interrupts */
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outb(0, iobase+UART_IER);
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}
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static void irport_start(struct irport_cb *self)
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{
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int iobase;
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iobase = self->io.sir_base;
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irport_stop(self);
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/* We can't lock, we may be called from a FIR driver - Jean II */
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/* Initialize UART */
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outb(UART_LCR_WLEN8, iobase+UART_LCR); /* Reset DLAB */
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outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase+UART_MCR);
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/* Turn on interrups */
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outb(UART_IER_RLSI | UART_IER_RDI |UART_IER_THRI, iobase+UART_IER);
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}
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/*
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* Function irport_get_fcr (speed)
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*
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* Compute value of fcr
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*
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*/
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static inline unsigned int irport_get_fcr(__u32 speed)
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{
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unsigned int fcr; /* FIFO control reg */
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/* Enable fifos */
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fcr = UART_FCR_ENABLE_FIFO;
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/*
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* Use trigger level 1 to avoid 3 ms. timeout delay at 9600 bps, and
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* almost 1,7 ms at 19200 bps. At speeds above that we can just forget
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* about this timeout since it will always be fast enough.
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*/
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if (speed < 38400)
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fcr |= UART_FCR_TRIGGER_1;
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else
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//fcr |= UART_FCR_TRIGGER_14;
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fcr |= UART_FCR_TRIGGER_8;
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return(fcr);
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}
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/*
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* Function irport_change_speed (self, speed)
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*
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* Set speed of IrDA port to specified baudrate
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*
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* This function should be called with irq off and spin-lock.
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*/
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static void irport_change_speed(void *priv, __u32 speed)
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{
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struct irport_cb *self = (struct irport_cb *) priv;
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int iobase;
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unsigned int fcr; /* FIFO control reg */
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unsigned int lcr; /* Line control reg */
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int divisor;
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(speed != 0, return;);
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IRDA_DEBUG(1, "%s(), Setting speed to: %d - iobase=%#x\n",
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__FUNCTION__, speed, self->io.sir_base);
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/* We can't lock, we may be called from a FIR driver - Jean II */
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iobase = self->io.sir_base;
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/* Update accounting for new speed */
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self->io.speed = speed;
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/* Turn off interrupts */
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outb(0, iobase+UART_IER);
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divisor = SPEED_MAX/speed;
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/* Get proper fifo configuration */
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fcr = irport_get_fcr(speed);
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/* IrDA ports use 8N1 */
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lcr = UART_LCR_WLEN8;
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outb(UART_LCR_DLAB | lcr, iobase+UART_LCR); /* Set DLAB */
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outb(divisor & 0xff, iobase+UART_DLL); /* Set speed */
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outb(divisor >> 8, iobase+UART_DLM);
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outb(lcr, iobase+UART_LCR); /* Set 8N1 */
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outb(fcr, iobase+UART_FCR); /* Enable FIFO's */
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/* Turn on interrups */
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/* This will generate a fatal interrupt storm.
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* People calling us will do that properly - Jean II */
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//outb(/*UART_IER_RLSI|*/UART_IER_RDI/*|UART_IER_THRI*/, iobase+UART_IER);
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}
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/*
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* Function __irport_change_speed (instance, state, param)
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*
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* State machine for changing speed of the device. We do it this way since
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* we cannot use schedule_timeout() when we are in interrupt context
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*
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*/
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static int __irport_change_speed(struct irda_task *task)
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{
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struct irport_cb *self;
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__u32 speed = (__u32) task->param;
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unsigned long flags = 0;
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int wasunlocked = 0;
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int ret = 0;
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IRDA_DEBUG(2, "%s(), <%ld>\n", __FUNCTION__, jiffies);
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self = (struct irport_cb *) task->instance;
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IRDA_ASSERT(self != NULL, return -1;);
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/* Locking notes : this function may be called from irq context with
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* spinlock, via irport_write_wakeup(), or from non-interrupt without
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* spinlock (from the task timer). Yuck !
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* This is ugly, and unsafe is the spinlock is not already acquired.
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* This will be fixed when irda-task get rewritten.
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* Jean II */
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if (!spin_is_locked(&self->lock)) {
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spin_lock_irqsave(&self->lock, flags);
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wasunlocked = 1;
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}
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switch (task->state) {
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case IRDA_TASK_INIT:
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case IRDA_TASK_WAIT:
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/* Are we ready to change speed yet? */
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if (self->tx_buff.len > 0) {
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task->state = IRDA_TASK_WAIT;
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/* Try again later */
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ret = msecs_to_jiffies(20);
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break;
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}
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if (self->dongle)
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irda_task_next_state(task, IRDA_TASK_CHILD_INIT);
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else
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irda_task_next_state(task, IRDA_TASK_CHILD_DONE);
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break;
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case IRDA_TASK_CHILD_INIT:
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/* Go to default speed */
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self->change_speed(self->priv, 9600);
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/* Change speed of dongle */
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if (irda_task_execute(self->dongle,
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self->dongle->issue->change_speed,
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NULL, task, (void *) speed))
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{
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/* Dongle need more time to change its speed */
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irda_task_next_state(task, IRDA_TASK_CHILD_WAIT);
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/* Give dongle 1 sec to finish */
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ret = msecs_to_jiffies(1000);
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} else
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/* Child finished immediately */
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irda_task_next_state(task, IRDA_TASK_CHILD_DONE);
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break;
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case IRDA_TASK_CHILD_WAIT:
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IRDA_WARNING("%s(), changing speed of dongle timed out!\n", __FUNCTION__);
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ret = -1;
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break;
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case IRDA_TASK_CHILD_DONE:
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/* Finally we are ready to change the speed */
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self->change_speed(self->priv, speed);
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irda_task_next_state(task, IRDA_TASK_DONE);
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break;
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default:
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IRDA_ERROR("%s(), unknown state %d\n",
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__FUNCTION__, task->state);
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irda_task_next_state(task, IRDA_TASK_DONE);
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ret = -1;
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break;
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}
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/* Put stuff in the state we found them - Jean II */
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if(wasunlocked) {
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spin_unlock_irqrestore(&self->lock, flags);
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}
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|
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return ret;
|
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}
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|
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/*
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* Function irport_change_speed_complete (task)
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*
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* Called when the change speed operation completes
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*
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*/
|
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static int irport_change_speed_complete(struct irda_task *task)
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{
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struct irport_cb *self;
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|
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IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
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self = (struct irport_cb *) task->instance;
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IRDA_ASSERT(self != NULL, return -1;);
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IRDA_ASSERT(self->netdev != NULL, return -1;);
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|
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/* Finished changing speed, so we are not busy any longer */
|
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/* Signal network layer so it can try to send the frame */
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|
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netif_wake_queue(self->netdev);
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|
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return 0;
|
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}
|
|
|
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/*
|
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* Function irport_timeout (struct net_device *dev)
|
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*
|
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* The networking layer thinks we timed out.
|
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*
|
|
*/
|
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|
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static void irport_timeout(struct net_device *dev)
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{
|
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struct irport_cb *self;
|
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int iobase;
|
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int iir, lsr;
|
|
unsigned long flags;
|
|
|
|
self = (struct irport_cb *) dev->priv;
|
|
IRDA_ASSERT(self != NULL, return;);
|
|
iobase = self->io.sir_base;
|
|
|
|
IRDA_WARNING("%s: transmit timed out, jiffies = %ld, trans_start = %ld\n",
|
|
dev->name, jiffies, dev->trans_start);
|
|
spin_lock_irqsave(&self->lock, flags);
|
|
|
|
/* Debug what's happening... */
|
|
|
|
/* Get interrupt status */
|
|
lsr = inb(iobase+UART_LSR);
|
|
/* Read interrupt register */
|
|
iir = inb(iobase+UART_IIR);
|
|
IRDA_DEBUG(0, "%s(), iir=%02x, lsr=%02x, iobase=%#x\n",
|
|
__FUNCTION__, iir, lsr, iobase);
|
|
|
|
IRDA_DEBUG(0, "%s(), transmitting=%d, remain=%d, done=%d\n",
|
|
__FUNCTION__, self->transmitting, self->tx_buff.len,
|
|
self->tx_buff.data - self->tx_buff.head);
|
|
|
|
/* Now, restart the port */
|
|
irport_start(self);
|
|
self->change_speed(self->priv, self->io.speed);
|
|
/* This will re-enable irqs */
|
|
outb(/*UART_IER_RLSI|*/UART_IER_RDI/*|UART_IER_THRI*/, iobase+UART_IER);
|
|
dev->trans_start = jiffies;
|
|
spin_unlock_irqrestore(&self->lock, flags);
|
|
|
|
netif_wake_queue(dev);
|
|
}
|
|
|
|
/*
|
|
* Function irport_wait_hw_transmitter_finish ()
|
|
*
|
|
* Wait for the real end of HW transmission
|
|
*
|
|
* The UART is a strict FIFO, and we get called only when we have finished
|
|
* pushing data to the FIFO, so the maximum amount of time we must wait
|
|
* is only for the FIFO to drain out.
|
|
*
|
|
* We use a simple calibrated loop. We may need to adjust the loop
|
|
* delay (udelay) to balance I/O traffic and latency. And we also need to
|
|
* adjust the maximum timeout.
|
|
* It would probably be better to wait for the proper interrupt,
|
|
* but it doesn't seem to be available.
|
|
*
|
|
* We can't use jiffies or kernel timers because :
|
|
* 1) We are called from the interrupt handler, which disable softirqs,
|
|
* so jiffies won't be increased
|
|
* 2) Jiffies granularity is usually very coarse (10ms), and we don't
|
|
* want to wait that long to detect stuck hardware.
|
|
* Jean II
|
|
*/
|
|
|
|
static void irport_wait_hw_transmitter_finish(struct irport_cb *self)
|
|
{
|
|
int iobase;
|
|
int count = 1000; /* 1 ms */
|
|
|
|
iobase = self->io.sir_base;
|
|
|
|
/* Calibrated busy loop */
|
|
while((count-- > 0) && !(inb(iobase+UART_LSR) & UART_LSR_TEMT))
|
|
udelay(1);
|
|
|
|
if(count == 0)
|
|
IRDA_DEBUG(0, "%s(): stuck transmitter\n", __FUNCTION__);
|
|
}
|
|
|
|
/*
|
|
* Function irport_hard_start_xmit (struct sk_buff *skb, struct net_device *dev)
|
|
*
|
|
* Transmits the current frame until FIFO is full, then
|
|
* waits until the next transmitt interrupt, and continues until the
|
|
* frame is transmitted.
|
|
*/
|
|
static int irport_hard_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct irport_cb *self;
|
|
unsigned long flags;
|
|
int iobase;
|
|
s32 speed;
|
|
|
|
IRDA_DEBUG(1, "%s()\n", __FUNCTION__);
|
|
|
|
IRDA_ASSERT(dev != NULL, return 0;);
|
|
|
|
self = (struct irport_cb *) dev->priv;
|
|
IRDA_ASSERT(self != NULL, return 0;);
|
|
|
|
iobase = self->io.sir_base;
|
|
|
|
netif_stop_queue(dev);
|
|
|
|
/* Make sure tests & speed change are atomic */
|
|
spin_lock_irqsave(&self->lock, flags);
|
|
|
|
/* Check if we need to change the speed */
|
|
speed = irda_get_next_speed(skb);
|
|
if ((speed != self->io.speed) && (speed != -1)) {
|
|
/* Check for empty frame */
|
|
if (!skb->len) {
|
|
/*
|
|
* We send frames one by one in SIR mode (no
|
|
* pipelining), so at this point, if we were sending
|
|
* a previous frame, we just received the interrupt
|
|
* telling us it is finished (UART_IIR_THRI).
|
|
* Therefore, waiting for the transmitter to really
|
|
* finish draining the fifo won't take too long.
|
|
* And the interrupt handler is not expected to run.
|
|
* - Jean II */
|
|
irport_wait_hw_transmitter_finish(self);
|
|
/* Better go there already locked - Jean II */
|
|
irda_task_execute(self, __irport_change_speed,
|
|
irport_change_speed_complete,
|
|
NULL, (void *) speed);
|
|
dev->trans_start = jiffies;
|
|
spin_unlock_irqrestore(&self->lock, flags);
|
|
dev_kfree_skb(skb);
|
|
return 0;
|
|
} else
|
|
self->new_speed = speed;
|
|
}
|
|
|
|
/* Init tx buffer */
|
|
self->tx_buff.data = self->tx_buff.head;
|
|
|
|
/* Copy skb to tx_buff while wrapping, stuffing and making CRC */
|
|
self->tx_buff.len = async_wrap_skb(skb, self->tx_buff.data,
|
|
self->tx_buff.truesize);
|
|
|
|
self->stats.tx_bytes += self->tx_buff.len;
|
|
|
|
/* We are transmitting */
|
|
self->transmitting = 1;
|
|
|
|
/* Turn on transmit finished interrupt. Will fire immediately! */
|
|
outb(UART_IER_THRI, iobase+UART_IER);
|
|
|
|
dev->trans_start = jiffies;
|
|
spin_unlock_irqrestore(&self->lock, flags);
|
|
|
|
dev_kfree_skb(skb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Function irport_write (driver)
|
|
*
|
|
* Fill Tx FIFO with transmit data
|
|
*
|
|
* Called only from irport_write_wakeup()
|
|
*/
|
|
static inline int irport_write(int iobase, int fifo_size, __u8 *buf, int len)
|
|
{
|
|
int actual = 0;
|
|
|
|
/* Fill FIFO with current frame */
|
|
while ((actual < fifo_size) && (actual < len)) {
|
|
/* Transmit next byte */
|
|
outb(buf[actual], iobase+UART_TX);
|
|
|
|
actual++;
|
|
}
|
|
|
|
return actual;
|
|
}
|
|
|
|
/*
|
|
* Function irport_write_wakeup (tty)
|
|
*
|
|
* Called by the driver when there's room for more data. If we have
|
|
* more packets to send, we send them here.
|
|
*
|
|
* Called only from irport_interrupt()
|
|
* Make sure this function is *not* called while we are receiving,
|
|
* otherwise we will reset fifo and loose data :-(
|
|
*/
|
|
static inline void irport_write_wakeup(struct irport_cb *self)
|
|
{
|
|
int actual = 0;
|
|
int iobase;
|
|
unsigned int fcr;
|
|
|
|
IRDA_ASSERT(self != NULL, return;);
|
|
|
|
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
|
|
|
|
iobase = self->io.sir_base;
|
|
|
|
/* Finished with frame? */
|
|
if (self->tx_buff.len > 0) {
|
|
/* Write data left in transmit buffer */
|
|
actual = irport_write(iobase, self->io.fifo_size,
|
|
self->tx_buff.data, self->tx_buff.len);
|
|
self->tx_buff.data += actual;
|
|
self->tx_buff.len -= actual;
|
|
} else {
|
|
/*
|
|
* Now serial buffer is almost free & we can start
|
|
* transmission of another packet. But first we must check
|
|
* if we need to change the speed of the hardware
|
|
*/
|
|
if (self->new_speed) {
|
|
irport_wait_hw_transmitter_finish(self);
|
|
irda_task_execute(self, __irport_change_speed,
|
|
irport_change_speed_complete,
|
|
NULL, (void *) self->new_speed);
|
|
self->new_speed = 0;
|
|
} else {
|
|
/* Tell network layer that we want more frames */
|
|
netif_wake_queue(self->netdev);
|
|
}
|
|
self->stats.tx_packets++;
|
|
|
|
/*
|
|
* Reset Rx FIFO to make sure that all reflected transmit data
|
|
* is discarded. This is needed for half duplex operation
|
|
*/
|
|
fcr = irport_get_fcr(self->io.speed);
|
|
fcr |= UART_FCR_CLEAR_RCVR;
|
|
outb(fcr, iobase+UART_FCR);
|
|
|
|
/* Finished transmitting */
|
|
self->transmitting = 0;
|
|
|
|
/* Turn on receive interrupts */
|
|
outb(UART_IER_RDI, iobase+UART_IER);
|
|
|
|
IRDA_DEBUG(1, "%s() : finished Tx\n", __FUNCTION__);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Function irport_receive (self)
|
|
*
|
|
* Receive one frame from the infrared port
|
|
*
|
|
* Called only from irport_interrupt()
|
|
*/
|
|
static inline void irport_receive(struct irport_cb *self)
|
|
{
|
|
int boguscount = 0;
|
|
int iobase;
|
|
|
|
IRDA_ASSERT(self != NULL, return;);
|
|
|
|
iobase = self->io.sir_base;
|
|
|
|
/*
|
|
* Receive all characters in Rx FIFO, unwrap and unstuff them.
|
|
* async_unwrap_char will deliver all found frames
|
|
*/
|
|
do {
|
|
async_unwrap_char(self->netdev, &self->stats, &self->rx_buff,
|
|
inb(iobase+UART_RX));
|
|
|
|
/* Make sure we don't stay here too long */
|
|
if (boguscount++ > 32) {
|
|
IRDA_DEBUG(2,"%s(), breaking!\n", __FUNCTION__);
|
|
break;
|
|
}
|
|
} while (inb(iobase+UART_LSR) & UART_LSR_DR);
|
|
}
|
|
|
|
/*
|
|
* Function irport_interrupt (irq, dev_id, regs)
|
|
*
|
|
* Interrupt handler
|
|
*/
|
|
static irqreturn_t irport_interrupt(int irq, void *dev_id,
|
|
struct pt_regs *regs)
|
|
{
|
|
struct net_device *dev = (struct net_device *) dev_id;
|
|
struct irport_cb *self;
|
|
int boguscount = 0;
|
|
int iobase;
|
|
int iir, lsr;
|
|
int handled = 0;
|
|
|
|
if (!dev) {
|
|
IRDA_WARNING("%s() irq %d for unknown device.\n", __FUNCTION__, irq);
|
|
return IRQ_NONE;
|
|
}
|
|
self = (struct irport_cb *) dev->priv;
|
|
|
|
spin_lock(&self->lock);
|
|
|
|
iobase = self->io.sir_base;
|
|
|
|
/* Cut'n'paste interrupt routine from serial.c
|
|
* This version try to minimise latency and I/O operations.
|
|
* Simplified and modified to enforce half duplex operation.
|
|
* - Jean II */
|
|
|
|
/* Check status even is iir reg is cleared, more robust and
|
|
* eliminate a read on the I/O bus - Jean II */
|
|
do {
|
|
/* Get interrupt status ; Clear interrupt */
|
|
lsr = inb(iobase+UART_LSR);
|
|
|
|
/* Are we receiving or transmitting ? */
|
|
if(!self->transmitting) {
|
|
/* Received something ? */
|
|
if (lsr & UART_LSR_DR)
|
|
irport_receive(self);
|
|
} else {
|
|
/* Room in Tx fifo ? */
|
|
if (lsr & (UART_LSR_THRE | UART_LSR_TEMT))
|
|
irport_write_wakeup(self);
|
|
}
|
|
|
|
/* A bit hackish, but working as expected... Jean II */
|
|
if(lsr & (UART_LSR_THRE | UART_LSR_TEMT | UART_LSR_DR))
|
|
handled = 1;
|
|
|
|
/* Make sure we don't stay here to long */
|
|
if (boguscount++ > 10) {
|
|
IRDA_WARNING("%s() irq handler looping : lsr=%02x\n",
|
|
__FUNCTION__, lsr);
|
|
break;
|
|
}
|
|
|
|
/* Read interrupt register */
|
|
iir = inb(iobase+UART_IIR);
|
|
|
|
/* Enable this debug only when no other options and at low
|
|
* bit rates, otherwise it may cause Rx overruns (lsr=63).
|
|
* - Jean II */
|
|
IRDA_DEBUG(6, "%s(), iir=%02x, lsr=%02x, iobase=%#x\n",
|
|
__FUNCTION__, iir, lsr, iobase);
|
|
|
|
/* As long as interrupt pending... */
|
|
} while ((iir & UART_IIR_NO_INT) == 0);
|
|
|
|
spin_unlock(&self->lock);
|
|
return IRQ_RETVAL(handled);
|
|
}
|
|
|
|
/*
|
|
* Function irport_net_open (dev)
|
|
*
|
|
* Network device is taken up. Usually this is done by "ifconfig irda0 up"
|
|
*
|
|
*/
|
|
static int irport_net_open(struct net_device *dev)
|
|
{
|
|
struct irport_cb *self;
|
|
int iobase;
|
|
char hwname[16];
|
|
unsigned long flags;
|
|
|
|
IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
|
|
|
|
IRDA_ASSERT(dev != NULL, return -1;);
|
|
self = (struct irport_cb *) dev->priv;
|
|
|
|
iobase = self->io.sir_base;
|
|
|
|
if (request_irq(self->io.irq, self->interrupt, 0, dev->name,
|
|
(void *) dev)) {
|
|
IRDA_DEBUG(0, "%s(), unable to allocate irq=%d\n",
|
|
__FUNCTION__, self->io.irq);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
spin_lock_irqsave(&self->lock, flags);
|
|
/* Init uart */
|
|
irport_start(self);
|
|
/* Set 9600 bauds per default, including at the dongle */
|
|
irda_task_execute(self, __irport_change_speed,
|
|
irport_change_speed_complete,
|
|
NULL, (void *) 9600);
|
|
spin_unlock_irqrestore(&self->lock, flags);
|
|
|
|
|
|
/* Give self a hardware name */
|
|
sprintf(hwname, "SIR @ 0x%03x", self->io.sir_base);
|
|
|
|
/*
|
|
* Open new IrLAP layer instance, now that everything should be
|
|
* initialized properly
|
|
*/
|
|
self->irlap = irlap_open(dev, &self->qos, hwname);
|
|
|
|
/* Ready to play! */
|
|
|
|
netif_start_queue(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Function irport_net_close (self)
|
|
*
|
|
* Network device is taken down. Usually this is done by
|
|
* "ifconfig irda0 down"
|
|
*/
|
|
static int irport_net_close(struct net_device *dev)
|
|
{
|
|
struct irport_cb *self;
|
|
int iobase;
|
|
unsigned long flags;
|
|
|
|
IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
|
|
|
|
IRDA_ASSERT(dev != NULL, return -1;);
|
|
self = (struct irport_cb *) dev->priv;
|
|
|
|
IRDA_ASSERT(self != NULL, return -1;);
|
|
|
|
iobase = self->io.sir_base;
|
|
|
|
/* Stop device */
|
|
netif_stop_queue(dev);
|
|
|
|
/* Stop and remove instance of IrLAP */
|
|
if (self->irlap)
|
|
irlap_close(self->irlap);
|
|
self->irlap = NULL;
|
|
|
|
spin_lock_irqsave(&self->lock, flags);
|
|
irport_stop(self);
|
|
spin_unlock_irqrestore(&self->lock, flags);
|
|
|
|
free_irq(self->io.irq, dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Function irport_is_receiving (self)
|
|
*
|
|
* Returns true is we are currently receiving data
|
|
*
|
|
*/
|
|
static inline int irport_is_receiving(struct irport_cb *self)
|
|
{
|
|
return (self->rx_buff.state != OUTSIDE_FRAME);
|
|
}
|
|
|
|
/*
|
|
* Function irport_set_dtr_rts (tty, dtr, rts)
|
|
*
|
|
* This function can be used by dongles etc. to set or reset the status
|
|
* of the dtr and rts lines
|
|
*/
|
|
static int irport_set_dtr_rts(struct net_device *dev, int dtr, int rts)
|
|
{
|
|
struct irport_cb *self = dev->priv;
|
|
int iobase;
|
|
|
|
IRDA_ASSERT(self != NULL, return -1;);
|
|
|
|
iobase = self->io.sir_base;
|
|
|
|
if (dtr)
|
|
dtr = UART_MCR_DTR;
|
|
if (rts)
|
|
rts = UART_MCR_RTS;
|
|
|
|
outb(dtr|rts|UART_MCR_OUT2, iobase+UART_MCR);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int irport_raw_write(struct net_device *dev, __u8 *buf, int len)
|
|
{
|
|
struct irport_cb *self = (struct irport_cb *) dev->priv;
|
|
int actual = 0;
|
|
int iobase;
|
|
|
|
IRDA_ASSERT(self != NULL, return -1;);
|
|
|
|
iobase = self->io.sir_base;
|
|
|
|
/* Tx FIFO should be empty! */
|
|
if (!(inb(iobase+UART_LSR) & UART_LSR_THRE)) {
|
|
IRDA_DEBUG( 0, "%s(), failed, fifo not empty!\n", __FUNCTION__);
|
|
return -1;
|
|
}
|
|
|
|
/* Fill FIFO with current frame */
|
|
while (actual < len) {
|
|
/* Transmit next byte */
|
|
outb(buf[actual], iobase+UART_TX);
|
|
actual++;
|
|
}
|
|
|
|
return actual;
|
|
}
|
|
|
|
/*
|
|
* Function irport_net_ioctl (dev, rq, cmd)
|
|
*
|
|
* Process IOCTL commands for this device
|
|
*
|
|
*/
|
|
static int irport_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
|
|
{
|
|
struct if_irda_req *irq = (struct if_irda_req *) rq;
|
|
struct irport_cb *self;
|
|
dongle_t *dongle;
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
|
|
IRDA_ASSERT(dev != NULL, return -1;);
|
|
|
|
self = dev->priv;
|
|
|
|
IRDA_ASSERT(self != NULL, return -1;);
|
|
|
|
IRDA_DEBUG(2, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__, dev->name, cmd);
|
|
|
|
switch (cmd) {
|
|
case SIOCSBANDWIDTH: /* Set bandwidth */
|
|
if (!capable(CAP_NET_ADMIN))
|
|
ret = -EPERM;
|
|
else
|
|
irda_task_execute(self, __irport_change_speed, NULL,
|
|
NULL, (void *) irq->ifr_baudrate);
|
|
break;
|
|
case SIOCSDONGLE: /* Set dongle */
|
|
if (!capable(CAP_NET_ADMIN)) {
|
|
ret = -EPERM;
|
|
break;
|
|
}
|
|
|
|
/* Locking :
|
|
* irda_device_dongle_init() can't be locked.
|
|
* irda_task_execute() doesn't need to be locked.
|
|
* Jean II
|
|
*/
|
|
|
|
/* Initialize dongle */
|
|
dongle = irda_device_dongle_init(dev, irq->ifr_dongle);
|
|
if (!dongle)
|
|
break;
|
|
|
|
dongle->set_mode = NULL;
|
|
dongle->read = NULL;
|
|
dongle->write = irport_raw_write;
|
|
dongle->set_dtr_rts = irport_set_dtr_rts;
|
|
|
|
/* Now initialize the dongle! */
|
|
dongle->issue->open(dongle, &self->qos);
|
|
|
|
/* Reset dongle */
|
|
irda_task_execute(dongle, dongle->issue->reset, NULL, NULL,
|
|
NULL);
|
|
|
|
/* Make dongle available to driver only now to avoid
|
|
* race conditions - Jean II */
|
|
self->dongle = dongle;
|
|
break;
|
|
case SIOCSMEDIABUSY: /* Set media busy */
|
|
if (!capable(CAP_NET_ADMIN)) {
|
|
ret = -EPERM;
|
|
break;
|
|
}
|
|
|
|
irda_device_set_media_busy(self->netdev, TRUE);
|
|
break;
|
|
case SIOCGRECEIVING: /* Check if we are receiving right now */
|
|
irq->ifr_receiving = irport_is_receiving(self);
|
|
break;
|
|
case SIOCSDTRRTS:
|
|
if (!capable(CAP_NET_ADMIN)) {
|
|
ret = -EPERM;
|
|
break;
|
|
}
|
|
|
|
/* No real need to lock... */
|
|
spin_lock_irqsave(&self->lock, flags);
|
|
irport_set_dtr_rts(dev, irq->ifr_dtr, irq->ifr_rts);
|
|
spin_unlock_irqrestore(&self->lock, flags);
|
|
break;
|
|
default:
|
|
ret = -EOPNOTSUPP;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct net_device_stats *irport_net_get_stats(struct net_device *dev)
|
|
{
|
|
struct irport_cb *self = (struct irport_cb *) dev->priv;
|
|
|
|
return &self->stats;
|
|
}
|
|
|
|
static int __init irport_init(void)
|
|
{
|
|
int i;
|
|
|
|
for (i=0; (io[i] < 2000) && (i < ARRAY_SIZE(dev_self)); i++) {
|
|
if (irport_open(i, io[i], irq[i]) != NULL)
|
|
return 0;
|
|
}
|
|
/*
|
|
* Maybe something failed, but we can still be usable for FIR drivers
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Function irport_cleanup ()
|
|
*
|
|
* Close all configured ports
|
|
*
|
|
*/
|
|
static void __exit irport_cleanup(void)
|
|
{
|
|
int i;
|
|
|
|
IRDA_DEBUG( 4, "%s()\n", __FUNCTION__);
|
|
|
|
for (i=0; i < ARRAY_SIZE(dev_self); i++) {
|
|
if (dev_self[i])
|
|
irport_close(dev_self[i]);
|
|
}
|
|
}
|
|
|
|
module_param_array(io, int, NULL, 0);
|
|
MODULE_PARM_DESC(io, "Base I/O addresses");
|
|
module_param_array(irq, int, NULL, 0);
|
|
MODULE_PARM_DESC(irq, "IRQ lines");
|
|
|
|
MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
|
|
MODULE_DESCRIPTION("Half duplex serial driver for IrDA SIR mode");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(irport_init);
|
|
module_exit(irport_cleanup);
|
|
|