mirror of https://gitee.com/openkylin/linux.git
885 lines
20 KiB
C
885 lines
20 KiB
C
/*
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* linux/drivers/char/ppdev.c
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*
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* This is the code behind /dev/parport* -- it allows a user-space
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* application to use the parport subsystem.
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*
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* Copyright (C) 1998-2000, 2002 Tim Waugh <tim@cyberelk.net>
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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
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* A /dev/parportx device node represents an arbitrary device
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* on port 'x'. The following operations are possible:
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*
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* open do nothing, set up default IEEE 1284 protocol to be COMPAT
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* close release port and unregister device (if necessary)
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* ioctl
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* EXCL register device exclusively (may fail)
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* CLAIM (register device first time) parport_claim_or_block
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* RELEASE parport_release
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* SETMODE set the IEEE 1284 protocol to use for read/write
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* SETPHASE set the IEEE 1284 phase of a particular mode. Not to be
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* confused with ioctl(fd, SETPHASER, &stun). ;-)
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* DATADIR data_forward / data_reverse
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* WDATA write_data
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* RDATA read_data
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* WCONTROL write_control
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* RCONTROL read_control
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* FCONTROL frob_control
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* RSTATUS read_status
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* NEGOT parport_negotiate
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* YIELD parport_yield_blocking
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* WCTLONIRQ on interrupt, set control lines
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* CLRIRQ clear (and return) interrupt count
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* SETTIME sets device timeout (struct timeval)
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* GETTIME gets device timeout (struct timeval)
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* GETMODES gets hardware supported modes (unsigned int)
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* GETMODE gets the current IEEE1284 mode
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* GETPHASE gets the current IEEE1284 phase
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* GETFLAGS gets current (user-visible) flags
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* SETFLAGS sets current (user-visible) flags
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* read/write read or write in current IEEE 1284 protocol
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* select wait for interrupt (in readfds)
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*
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* Changes:
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* Added SETTIME/GETTIME ioctl, Fred Barnes, 1999.
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*
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* Arnaldo Carvalho de Melo <acme@conectiva.com.br> 2000/08/25
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* - On error, copy_from_user and copy_to_user do not return -EFAULT,
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* They return the positive number of bytes *not* copied due to address
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* space errors.
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*
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* Added GETMODES/GETMODE/GETPHASE ioctls, Fred Barnes <frmb2@ukc.ac.uk>, 03/01/2001.
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* Added GETFLAGS/SETFLAGS ioctls, Fred Barnes, 04/2001
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/device.h>
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#include <linux/ioctl.h>
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#include <linux/parport.h>
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#include <linux/ctype.h>
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#include <linux/poll.h>
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#include <linux/slab.h>
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#include <linux/major.h>
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#include <linux/ppdev.h>
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#include <linux/mutex.h>
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#include <linux/uaccess.h>
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#include <linux/compat.h>
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#define PP_VERSION "ppdev: user-space parallel port driver"
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#define CHRDEV "ppdev"
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struct pp_struct {
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struct pardevice *pdev;
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wait_queue_head_t irq_wait;
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atomic_t irqc;
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unsigned int flags;
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int irqresponse;
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unsigned char irqctl;
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struct ieee1284_info state;
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struct ieee1284_info saved_state;
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long default_inactivity;
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};
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/* should we use PARDEVICE_MAX here? */
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static struct device *devices[PARPORT_MAX];
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/* pp_struct.flags bitfields */
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#define PP_CLAIMED (1<<0)
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#define PP_EXCL (1<<1)
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/* Other constants */
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#define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */
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#define PP_BUFFER_SIZE 1024
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#define PARDEVICE_MAX 8
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/* ROUND_UP macro from fs/select.c */
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#define ROUND_UP(x,y) (((x)+(y)-1)/(y))
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static DEFINE_MUTEX(pp_do_mutex);
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/* define fixed sized ioctl cmd for y2038 migration */
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#define PPGETTIME32 _IOR(PP_IOCTL, 0x95, s32[2])
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#define PPSETTIME32 _IOW(PP_IOCTL, 0x96, s32[2])
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#define PPGETTIME64 _IOR(PP_IOCTL, 0x95, s64[2])
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#define PPSETTIME64 _IOW(PP_IOCTL, 0x96, s64[2])
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static inline void pp_enable_irq(struct pp_struct *pp)
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{
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struct parport *port = pp->pdev->port;
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port->ops->enable_irq(port);
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}
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static ssize_t pp_read(struct file *file, char __user *buf, size_t count,
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loff_t *ppos)
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{
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unsigned int minor = iminor(file_inode(file));
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struct pp_struct *pp = file->private_data;
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char *kbuffer;
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ssize_t bytes_read = 0;
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struct parport *pport;
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int mode;
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if (!(pp->flags & PP_CLAIMED)) {
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/* Don't have the port claimed */
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pr_debug(CHRDEV "%x: claim the port first\n", minor);
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return -EINVAL;
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}
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/* Trivial case. */
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if (count == 0)
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return 0;
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kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL);
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if (!kbuffer)
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return -ENOMEM;
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pport = pp->pdev->port;
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mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
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parport_set_timeout(pp->pdev,
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(file->f_flags & O_NONBLOCK) ?
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PARPORT_INACTIVITY_O_NONBLOCK :
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pp->default_inactivity);
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while (bytes_read == 0) {
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ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE);
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if (mode == IEEE1284_MODE_EPP) {
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/* various specials for EPP mode */
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int flags = 0;
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size_t (*fn)(struct parport *, void *, size_t, int);
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if (pp->flags & PP_W91284PIC)
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flags |= PARPORT_W91284PIC;
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if (pp->flags & PP_FASTREAD)
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flags |= PARPORT_EPP_FAST;
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if (pport->ieee1284.mode & IEEE1284_ADDR)
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fn = pport->ops->epp_read_addr;
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else
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fn = pport->ops->epp_read_data;
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bytes_read = (*fn)(pport, kbuffer, need, flags);
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} else {
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bytes_read = parport_read(pport, kbuffer, need);
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}
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if (bytes_read != 0)
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break;
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if (file->f_flags & O_NONBLOCK) {
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bytes_read = -EAGAIN;
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break;
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}
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if (signal_pending(current)) {
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bytes_read = -ERESTARTSYS;
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break;
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}
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cond_resched();
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}
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parport_set_timeout(pp->pdev, pp->default_inactivity);
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if (bytes_read > 0 && copy_to_user(buf, kbuffer, bytes_read))
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bytes_read = -EFAULT;
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kfree(kbuffer);
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pp_enable_irq(pp);
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return bytes_read;
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}
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static ssize_t pp_write(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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unsigned int minor = iminor(file_inode(file));
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struct pp_struct *pp = file->private_data;
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char *kbuffer;
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ssize_t bytes_written = 0;
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ssize_t wrote;
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int mode;
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struct parport *pport;
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if (!(pp->flags & PP_CLAIMED)) {
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/* Don't have the port claimed */
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pr_debug(CHRDEV "%x: claim the port first\n", minor);
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return -EINVAL;
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}
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kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL);
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if (!kbuffer)
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return -ENOMEM;
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pport = pp->pdev->port;
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mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
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parport_set_timeout(pp->pdev,
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(file->f_flags & O_NONBLOCK) ?
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PARPORT_INACTIVITY_O_NONBLOCK :
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pp->default_inactivity);
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while (bytes_written < count) {
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ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE);
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if (copy_from_user(kbuffer, buf + bytes_written, n)) {
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bytes_written = -EFAULT;
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break;
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}
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if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) {
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/* do a fast EPP write */
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if (pport->ieee1284.mode & IEEE1284_ADDR) {
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wrote = pport->ops->epp_write_addr(pport,
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kbuffer, n, PARPORT_EPP_FAST);
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} else {
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wrote = pport->ops->epp_write_data(pport,
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kbuffer, n, PARPORT_EPP_FAST);
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}
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} else {
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wrote = parport_write(pp->pdev->port, kbuffer, n);
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}
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if (wrote <= 0) {
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if (!bytes_written)
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bytes_written = wrote;
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break;
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}
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bytes_written += wrote;
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if (file->f_flags & O_NONBLOCK) {
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if (!bytes_written)
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bytes_written = -EAGAIN;
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break;
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}
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if (signal_pending(current))
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break;
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cond_resched();
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}
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parport_set_timeout(pp->pdev, pp->default_inactivity);
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kfree(kbuffer);
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pp_enable_irq(pp);
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return bytes_written;
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}
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static void pp_irq(void *private)
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{
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struct pp_struct *pp = private;
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if (pp->irqresponse) {
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parport_write_control(pp->pdev->port, pp->irqctl);
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pp->irqresponse = 0;
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}
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atomic_inc(&pp->irqc);
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wake_up_interruptible(&pp->irq_wait);
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}
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static int register_device(int minor, struct pp_struct *pp)
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{
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struct parport *port;
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struct pardevice *pdev = NULL;
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char *name;
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struct pardev_cb ppdev_cb;
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int rc = 0;
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name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor);
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if (name == NULL)
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return -ENOMEM;
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port = parport_find_number(minor);
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if (!port) {
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pr_warn("%s: no associated port!\n", name);
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rc = -ENXIO;
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goto err;
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}
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memset(&ppdev_cb, 0, sizeof(ppdev_cb));
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ppdev_cb.irq_func = pp_irq;
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ppdev_cb.flags = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0;
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ppdev_cb.private = pp;
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pdev = parport_register_dev_model(port, name, &ppdev_cb, minor);
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parport_put_port(port);
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if (!pdev) {
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pr_warn("%s: failed to register device!\n", name);
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rc = -ENXIO;
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goto err;
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}
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pp->pdev = pdev;
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dev_dbg(&pdev->dev, "registered pardevice\n");
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err:
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kfree(name);
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return rc;
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}
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static enum ieee1284_phase init_phase(int mode)
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{
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switch (mode & ~(IEEE1284_DEVICEID
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| IEEE1284_ADDR)) {
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case IEEE1284_MODE_NIBBLE:
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case IEEE1284_MODE_BYTE:
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return IEEE1284_PH_REV_IDLE;
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}
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return IEEE1284_PH_FWD_IDLE;
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}
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static int pp_set_timeout(struct pardevice *pdev, long tv_sec, int tv_usec)
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{
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long to_jiffies;
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if ((tv_sec < 0) || (tv_usec < 0))
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return -EINVAL;
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to_jiffies = usecs_to_jiffies(tv_usec);
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to_jiffies += tv_sec * HZ;
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if (to_jiffies <= 0)
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return -EINVAL;
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pdev->timeout = to_jiffies;
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return 0;
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}
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static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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unsigned int minor = iminor(file_inode(file));
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struct pp_struct *pp = file->private_data;
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struct parport *port;
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void __user *argp = (void __user *)arg;
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/* First handle the cases that don't take arguments. */
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switch (cmd) {
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case PPCLAIM:
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{
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struct ieee1284_info *info;
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int ret;
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if (pp->flags & PP_CLAIMED) {
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dev_dbg(&pp->pdev->dev, "you've already got it!\n");
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return -EINVAL;
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}
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/* Deferred device registration. */
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if (!pp->pdev) {
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int err = register_device(minor, pp);
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if (err)
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return err;
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}
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ret = parport_claim_or_block(pp->pdev);
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if (ret < 0)
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return ret;
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pp->flags |= PP_CLAIMED;
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/* For interrupt-reporting to work, we need to be
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* informed of each interrupt. */
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pp_enable_irq(pp);
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/* We may need to fix up the state machine. */
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info = &pp->pdev->port->ieee1284;
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pp->saved_state.mode = info->mode;
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pp->saved_state.phase = info->phase;
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info->mode = pp->state.mode;
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info->phase = pp->state.phase;
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pp->default_inactivity = parport_set_timeout(pp->pdev, 0);
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parport_set_timeout(pp->pdev, pp->default_inactivity);
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return 0;
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}
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case PPEXCL:
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if (pp->pdev) {
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dev_dbg(&pp->pdev->dev,
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"too late for PPEXCL; already registered\n");
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if (pp->flags & PP_EXCL)
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/* But it's not really an error. */
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return 0;
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/* There's no chance of making the driver happy. */
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return -EINVAL;
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}
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/* Just remember to register the device exclusively
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* when we finally do the registration. */
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pp->flags |= PP_EXCL;
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return 0;
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case PPSETMODE:
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{
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int mode;
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if (copy_from_user(&mode, argp, sizeof(mode)))
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return -EFAULT;
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/* FIXME: validate mode */
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pp->state.mode = mode;
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pp->state.phase = init_phase(mode);
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if (pp->flags & PP_CLAIMED) {
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pp->pdev->port->ieee1284.mode = mode;
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pp->pdev->port->ieee1284.phase = pp->state.phase;
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}
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return 0;
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}
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case PPGETMODE:
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{
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int mode;
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if (pp->flags & PP_CLAIMED)
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mode = pp->pdev->port->ieee1284.mode;
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else
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mode = pp->state.mode;
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if (copy_to_user(argp, &mode, sizeof(mode)))
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return -EFAULT;
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return 0;
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}
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case PPSETPHASE:
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{
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int phase;
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if (copy_from_user(&phase, argp, sizeof(phase)))
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return -EFAULT;
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/* FIXME: validate phase */
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pp->state.phase = phase;
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if (pp->flags & PP_CLAIMED)
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pp->pdev->port->ieee1284.phase = phase;
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return 0;
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}
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case PPGETPHASE:
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{
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int phase;
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if (pp->flags & PP_CLAIMED)
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phase = pp->pdev->port->ieee1284.phase;
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else
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phase = pp->state.phase;
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if (copy_to_user(argp, &phase, sizeof(phase)))
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return -EFAULT;
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return 0;
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}
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case PPGETMODES:
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{
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unsigned int modes;
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port = parport_find_number(minor);
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if (!port)
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return -ENODEV;
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modes = port->modes;
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parport_put_port(port);
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if (copy_to_user(argp, &modes, sizeof(modes)))
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return -EFAULT;
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return 0;
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}
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case PPSETFLAGS:
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{
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int uflags;
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if (copy_from_user(&uflags, argp, sizeof(uflags)))
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return -EFAULT;
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pp->flags &= ~PP_FLAGMASK;
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pp->flags |= (uflags & PP_FLAGMASK);
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return 0;
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}
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case PPGETFLAGS:
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{
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int uflags;
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uflags = pp->flags & PP_FLAGMASK;
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if (copy_to_user(argp, &uflags, sizeof(uflags)))
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return -EFAULT;
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return 0;
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}
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} /* end switch() */
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/* Everything else requires the port to be claimed, so check
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* that now. */
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if ((pp->flags & PP_CLAIMED) == 0) {
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pr_debug(CHRDEV "%x: claim the port first\n", minor);
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return -EINVAL;
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}
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port = pp->pdev->port;
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switch (cmd) {
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struct ieee1284_info *info;
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unsigned char reg;
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unsigned char mask;
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int mode;
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s32 time32[2];
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s64 time64[2];
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struct timespec64 ts;
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int ret;
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case PPRSTATUS:
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reg = parport_read_status(port);
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if (copy_to_user(argp, ®, sizeof(reg)))
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return -EFAULT;
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return 0;
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case PPRDATA:
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reg = parport_read_data(port);
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if (copy_to_user(argp, ®, sizeof(reg)))
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return -EFAULT;
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return 0;
|
|
case PPRCONTROL:
|
|
reg = parport_read_control(port);
|
|
if (copy_to_user(argp, ®, sizeof(reg)))
|
|
return -EFAULT;
|
|
return 0;
|
|
case PPYIELD:
|
|
parport_yield_blocking(pp->pdev);
|
|
return 0;
|
|
|
|
case PPRELEASE:
|
|
/* Save the state machine's state. */
|
|
info = &pp->pdev->port->ieee1284;
|
|
pp->state.mode = info->mode;
|
|
pp->state.phase = info->phase;
|
|
info->mode = pp->saved_state.mode;
|
|
info->phase = pp->saved_state.phase;
|
|
parport_release(pp->pdev);
|
|
pp->flags &= ~PP_CLAIMED;
|
|
return 0;
|
|
|
|
case PPWCONTROL:
|
|
if (copy_from_user(®, argp, sizeof(reg)))
|
|
return -EFAULT;
|
|
parport_write_control(port, reg);
|
|
return 0;
|
|
|
|
case PPWDATA:
|
|
if (copy_from_user(®, argp, sizeof(reg)))
|
|
return -EFAULT;
|
|
parport_write_data(port, reg);
|
|
return 0;
|
|
|
|
case PPFCONTROL:
|
|
if (copy_from_user(&mask, argp,
|
|
sizeof(mask)))
|
|
return -EFAULT;
|
|
if (copy_from_user(®, 1 + (unsigned char __user *) arg,
|
|
sizeof(reg)))
|
|
return -EFAULT;
|
|
parport_frob_control(port, mask, reg);
|
|
return 0;
|
|
|
|
case PPDATADIR:
|
|
if (copy_from_user(&mode, argp, sizeof(mode)))
|
|
return -EFAULT;
|
|
if (mode)
|
|
port->ops->data_reverse(port);
|
|
else
|
|
port->ops->data_forward(port);
|
|
return 0;
|
|
|
|
case PPNEGOT:
|
|
if (copy_from_user(&mode, argp, sizeof(mode)))
|
|
return -EFAULT;
|
|
switch ((ret = parport_negotiate(port, mode))) {
|
|
case 0: break;
|
|
case -1: /* handshake failed, peripheral not IEEE 1284 */
|
|
ret = -EIO;
|
|
break;
|
|
case 1: /* handshake succeeded, peripheral rejected mode */
|
|
ret = -ENXIO;
|
|
break;
|
|
}
|
|
pp_enable_irq(pp);
|
|
return ret;
|
|
|
|
case PPWCTLONIRQ:
|
|
if (copy_from_user(®, argp, sizeof(reg)))
|
|
return -EFAULT;
|
|
|
|
/* Remember what to set the control lines to, for next
|
|
* time we get an interrupt. */
|
|
pp->irqctl = reg;
|
|
pp->irqresponse = 1;
|
|
return 0;
|
|
|
|
case PPCLRIRQ:
|
|
ret = atomic_read(&pp->irqc);
|
|
if (copy_to_user(argp, &ret, sizeof(ret)))
|
|
return -EFAULT;
|
|
atomic_sub(ret, &pp->irqc);
|
|
return 0;
|
|
|
|
case PPSETTIME32:
|
|
if (copy_from_user(time32, argp, sizeof(time32)))
|
|
return -EFAULT;
|
|
|
|
return pp_set_timeout(pp->pdev, time32[0], time32[1]);
|
|
|
|
case PPSETTIME64:
|
|
if (copy_from_user(time64, argp, sizeof(time64)))
|
|
return -EFAULT;
|
|
|
|
return pp_set_timeout(pp->pdev, time64[0], time64[1]);
|
|
|
|
case PPGETTIME32:
|
|
jiffies_to_timespec64(pp->pdev->timeout, &ts);
|
|
time32[0] = ts.tv_sec;
|
|
time32[1] = ts.tv_nsec / NSEC_PER_USEC;
|
|
if ((time32[0] < 0) || (time32[1] < 0))
|
|
return -EINVAL;
|
|
|
|
if (copy_to_user(argp, time32, sizeof(time32)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
|
|
case PPGETTIME64:
|
|
jiffies_to_timespec64(pp->pdev->timeout, &ts);
|
|
time64[0] = ts.tv_sec;
|
|
time64[1] = ts.tv_nsec / NSEC_PER_USEC;
|
|
if ((time64[0] < 0) || (time64[1] < 0))
|
|
return -EINVAL;
|
|
|
|
if (copy_to_user(argp, time64, sizeof(time64)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
|
|
default:
|
|
dev_dbg(&pp->pdev->dev, "What? (cmd=0x%x)\n", cmd);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Keep the compiler happy */
|
|
return 0;
|
|
}
|
|
|
|
static long pp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
long ret;
|
|
|
|
mutex_lock(&pp_do_mutex);
|
|
ret = pp_do_ioctl(file, cmd, arg);
|
|
mutex_unlock(&pp_do_mutex);
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static long pp_compat_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
return pp_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
|
|
}
|
|
#endif
|
|
|
|
static int pp_open(struct inode *inode, struct file *file)
|
|
{
|
|
unsigned int minor = iminor(inode);
|
|
struct pp_struct *pp;
|
|
|
|
if (minor >= PARPORT_MAX)
|
|
return -ENXIO;
|
|
|
|
pp = kmalloc(sizeof(struct pp_struct), GFP_KERNEL);
|
|
if (!pp)
|
|
return -ENOMEM;
|
|
|
|
pp->state.mode = IEEE1284_MODE_COMPAT;
|
|
pp->state.phase = init_phase(pp->state.mode);
|
|
pp->flags = 0;
|
|
pp->irqresponse = 0;
|
|
atomic_set(&pp->irqc, 0);
|
|
init_waitqueue_head(&pp->irq_wait);
|
|
|
|
/* Defer the actual device registration until the first claim.
|
|
* That way, we know whether or not the driver wants to have
|
|
* exclusive access to the port (PPEXCL).
|
|
*/
|
|
pp->pdev = NULL;
|
|
file->private_data = pp;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pp_release(struct inode *inode, struct file *file)
|
|
{
|
|
unsigned int minor = iminor(inode);
|
|
struct pp_struct *pp = file->private_data;
|
|
int compat_negot;
|
|
|
|
compat_negot = 0;
|
|
if (!(pp->flags & PP_CLAIMED) && pp->pdev &&
|
|
(pp->state.mode != IEEE1284_MODE_COMPAT)) {
|
|
struct ieee1284_info *info;
|
|
|
|
/* parport released, but not in compatibility mode */
|
|
parport_claim_or_block(pp->pdev);
|
|
pp->flags |= PP_CLAIMED;
|
|
info = &pp->pdev->port->ieee1284;
|
|
pp->saved_state.mode = info->mode;
|
|
pp->saved_state.phase = info->phase;
|
|
info->mode = pp->state.mode;
|
|
info->phase = pp->state.phase;
|
|
compat_negot = 1;
|
|
} else if ((pp->flags & PP_CLAIMED) && pp->pdev &&
|
|
(pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) {
|
|
compat_negot = 2;
|
|
}
|
|
if (compat_negot) {
|
|
parport_negotiate(pp->pdev->port, IEEE1284_MODE_COMPAT);
|
|
dev_dbg(&pp->pdev->dev,
|
|
"negotiated back to compatibility mode because user-space forgot\n");
|
|
}
|
|
|
|
if (pp->flags & PP_CLAIMED) {
|
|
struct ieee1284_info *info;
|
|
|
|
info = &pp->pdev->port->ieee1284;
|
|
pp->state.mode = info->mode;
|
|
pp->state.phase = info->phase;
|
|
info->mode = pp->saved_state.mode;
|
|
info->phase = pp->saved_state.phase;
|
|
parport_release(pp->pdev);
|
|
if (compat_negot != 1) {
|
|
pr_debug(CHRDEV "%x: released pardevice "
|
|
"because user-space forgot\n", minor);
|
|
}
|
|
}
|
|
|
|
if (pp->pdev) {
|
|
parport_unregister_device(pp->pdev);
|
|
pp->pdev = NULL;
|
|
pr_debug(CHRDEV "%x: unregistered pardevice\n", minor);
|
|
}
|
|
|
|
kfree(pp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* No kernel lock held - fine */
|
|
static unsigned int pp_poll(struct file *file, poll_table *wait)
|
|
{
|
|
struct pp_struct *pp = file->private_data;
|
|
unsigned int mask = 0;
|
|
|
|
poll_wait(file, &pp->irq_wait, wait);
|
|
if (atomic_read(&pp->irqc))
|
|
mask |= POLLIN | POLLRDNORM;
|
|
|
|
return mask;
|
|
}
|
|
|
|
static struct class *ppdev_class;
|
|
|
|
static const struct file_operations pp_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
.read = pp_read,
|
|
.write = pp_write,
|
|
.poll = pp_poll,
|
|
.unlocked_ioctl = pp_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = pp_compat_ioctl,
|
|
#endif
|
|
.open = pp_open,
|
|
.release = pp_release,
|
|
};
|
|
|
|
static void pp_attach(struct parport *port)
|
|
{
|
|
struct device *ret;
|
|
|
|
if (devices[port->number])
|
|
return;
|
|
|
|
ret = device_create(ppdev_class, port->dev,
|
|
MKDEV(PP_MAJOR, port->number), NULL,
|
|
"parport%d", port->number);
|
|
if (IS_ERR(ret)) {
|
|
pr_err("Failed to create device parport%d\n",
|
|
port->number);
|
|
return;
|
|
}
|
|
devices[port->number] = ret;
|
|
}
|
|
|
|
static void pp_detach(struct parport *port)
|
|
{
|
|
if (!devices[port->number])
|
|
return;
|
|
|
|
device_destroy(ppdev_class, MKDEV(PP_MAJOR, port->number));
|
|
devices[port->number] = NULL;
|
|
}
|
|
|
|
static int pp_probe(struct pardevice *par_dev)
|
|
{
|
|
struct device_driver *drv = par_dev->dev.driver;
|
|
int len = strlen(drv->name);
|
|
|
|
if (strncmp(par_dev->name, drv->name, len))
|
|
return -ENODEV;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct parport_driver pp_driver = {
|
|
.name = CHRDEV,
|
|
.probe = pp_probe,
|
|
.match_port = pp_attach,
|
|
.detach = pp_detach,
|
|
.devmodel = true,
|
|
};
|
|
|
|
static int __init ppdev_init(void)
|
|
{
|
|
int err = 0;
|
|
|
|
if (register_chrdev(PP_MAJOR, CHRDEV, &pp_fops)) {
|
|
pr_warn(CHRDEV ": unable to get major %d\n", PP_MAJOR);
|
|
return -EIO;
|
|
}
|
|
ppdev_class = class_create(THIS_MODULE, CHRDEV);
|
|
if (IS_ERR(ppdev_class)) {
|
|
err = PTR_ERR(ppdev_class);
|
|
goto out_chrdev;
|
|
}
|
|
err = parport_register_driver(&pp_driver);
|
|
if (err < 0) {
|
|
pr_warn(CHRDEV ": unable to register with parport\n");
|
|
goto out_class;
|
|
}
|
|
|
|
pr_info(PP_VERSION "\n");
|
|
goto out;
|
|
|
|
out_class:
|
|
class_destroy(ppdev_class);
|
|
out_chrdev:
|
|
unregister_chrdev(PP_MAJOR, CHRDEV);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static void __exit ppdev_cleanup(void)
|
|
{
|
|
/* Clean up all parport stuff */
|
|
parport_unregister_driver(&pp_driver);
|
|
class_destroy(ppdev_class);
|
|
unregister_chrdev(PP_MAJOR, CHRDEV);
|
|
}
|
|
|
|
module_init(ppdev_init);
|
|
module_exit(ppdev_cleanup);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR);
|