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0a5f1d476a
There may be applications trying to seek on the irnet character device, so we should use noop_llseek to avoid returning an error when the default llseek changes to no_llseek. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Samuel Ortiz <samuel@sortiz.org> Cc: netdev@vger.kernel.org Signed-off-by: David S. Miller <davem@davemloft.net>
120 lines
3.1 KiB
C
120 lines
3.1 KiB
C
/*
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* IrNET protocol module : Synchronous PPP over an IrDA socket.
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*
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* Jean II - HPL `00 - <jt@hpl.hp.com>
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*
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* This file contains all definitions and declarations necessary for the
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* PPP part of the IrNET module.
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* This file is a private header, so other modules don't want to know
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* what's in there...
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*/
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#ifndef IRNET_PPP_H
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#define IRNET_PPP_H
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/***************************** INCLUDES *****************************/
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#include "irnet.h" /* Module global include */
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/************************ CONSTANTS & MACROS ************************/
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/* /dev/irnet file constants */
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#define IRNET_MAJOR 10 /* Misc range */
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#define IRNET_MINOR 187 /* Official allocation */
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/* IrNET control channel stuff */
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#define IRNET_MAX_COMMAND 256 /* Max length of a command line */
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/* PPP hardcore stuff */
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/* Bits in rbits (PPP flags in irnet struct) */
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#define SC_RCV_BITS (SC_RCV_B7_1|SC_RCV_B7_0|SC_RCV_ODDP|SC_RCV_EVNP)
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/* Bit numbers in busy */
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#define XMIT_BUSY 0
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#define RECV_BUSY 1
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#define XMIT_WAKEUP 2
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#define XMIT_FULL 3
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/* Queue management */
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#define PPPSYNC_MAX_RQLEN 32 /* arbitrary */
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/****************************** TYPES ******************************/
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/**************************** PROTOTYPES ****************************/
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/* ----------------------- CONTROL CHANNEL ----------------------- */
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static inline ssize_t
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irnet_ctrl_write(irnet_socket *,
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const char *,
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size_t);
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static inline ssize_t
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irnet_ctrl_read(irnet_socket *,
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struct file *,
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char *,
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size_t);
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static inline unsigned int
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irnet_ctrl_poll(irnet_socket *,
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struct file *,
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poll_table *);
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/* ----------------------- CHARACTER DEVICE ----------------------- */
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static int
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dev_irnet_open(struct inode *, /* fs callback : open */
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struct file *),
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dev_irnet_close(struct inode *,
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struct file *);
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static ssize_t
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dev_irnet_write(struct file *,
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const char __user *,
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size_t,
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loff_t *),
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dev_irnet_read(struct file *,
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char __user *,
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size_t,
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loff_t *);
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static unsigned int
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dev_irnet_poll(struct file *,
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poll_table *);
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static long
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dev_irnet_ioctl(struct file *,
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unsigned int,
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unsigned long);
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/* ------------------------ PPP INTERFACE ------------------------ */
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static inline struct sk_buff *
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irnet_prepare_skb(irnet_socket *,
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struct sk_buff *);
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static int
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ppp_irnet_send(struct ppp_channel *,
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struct sk_buff *);
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static int
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ppp_irnet_ioctl(struct ppp_channel *,
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unsigned int,
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unsigned long);
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/**************************** VARIABLES ****************************/
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/* Filesystem callbacks (to call us) */
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static const struct file_operations irnet_device_fops =
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{
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.owner = THIS_MODULE,
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.read = dev_irnet_read,
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.write = dev_irnet_write,
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.poll = dev_irnet_poll,
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.unlocked_ioctl = dev_irnet_ioctl,
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.open = dev_irnet_open,
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.release = dev_irnet_close,
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.llseek = noop_llseek,
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/* Also : llseek, readdir, mmap, flush, fsync, fasync, lock, readv, writev */
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};
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/* Structure so that the misc major (drivers/char/misc.c) take care of us... */
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static struct miscdevice irnet_misc_device =
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{
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IRNET_MINOR,
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"irnet",
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&irnet_device_fops
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};
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#endif /* IRNET_PPP_H */
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