| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * linux/drivers/char/ppdev.c |
| * |
| * This is the code behind /dev/parport* -- it allows a user-space |
| * application to use the parport subsystem. |
| * |
| * Copyright (C) 1998-2000, 2002 Tim Waugh <tim@cyberelk.net> |
| * |
| * A /dev/parportx device node represents an arbitrary device |
| * on port 'x'. The following operations are possible: |
| * |
| * open do nothing, set up default IEEE 1284 protocol to be COMPAT |
| * close release port and unregister device (if necessary) |
| * ioctl |
| * EXCL register device exclusively (may fail) |
| * CLAIM (register device first time) parport_claim_or_block |
| * RELEASE parport_release |
| * SETMODE set the IEEE 1284 protocol to use for read/write |
| * SETPHASE set the IEEE 1284 phase of a particular mode. Not to be |
| * confused with ioctl(fd, SETPHASER, &stun). ;-) |
| * DATADIR data_forward / data_reverse |
| * WDATA write_data |
| * RDATA read_data |
| * WCONTROL write_control |
| * RCONTROL read_control |
| * FCONTROL frob_control |
| * RSTATUS read_status |
| * NEGOT parport_negotiate |
| * YIELD parport_yield_blocking |
| * WCTLONIRQ on interrupt, set control lines |
| * CLRIRQ clear (and return) interrupt count |
| * SETTIME sets device timeout (struct timeval) |
| * GETTIME gets device timeout (struct timeval) |
| * GETMODES gets hardware supported modes (unsigned int) |
| * GETMODE gets the current IEEE1284 mode |
| * GETPHASE gets the current IEEE1284 phase |
| * GETFLAGS gets current (user-visible) flags |
| * SETFLAGS sets current (user-visible) flags |
| * read/write read or write in current IEEE 1284 protocol |
| * select wait for interrupt (in readfds) |
| * |
| * Changes: |
| * Added SETTIME/GETTIME ioctl, Fred Barnes, 1999. |
| * |
| * Arnaldo Carvalho de Melo <acme@conectiva.com.br> 2000/08/25 |
| * - On error, copy_from_user and copy_to_user do not return -EFAULT, |
| * They return the positive number of bytes *not* copied due to address |
| * space errors. |
| * |
| * Added GETMODES/GETMODE/GETPHASE ioctls, Fred Barnes <frmb2@ukc.ac.uk>, 03/01/2001. |
| * Added GETFLAGS/SETFLAGS ioctls, Fred Barnes, 04/2001 |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/sched/signal.h> |
| #include <linux/device.h> |
| #include <linux/ioctl.h> |
| #include <linux/parport.h> |
| #include <linux/ctype.h> |
| #include <linux/poll.h> |
| #include <linux/slab.h> |
| #include <linux/major.h> |
| #include <linux/ppdev.h> |
| #include <linux/mutex.h> |
| #include <linux/uaccess.h> |
| #include <linux/compat.h> |
| |
| #define PP_VERSION "ppdev: user-space parallel port driver" |
| #define CHRDEV "ppdev" |
| |
| struct pp_struct { |
| struct pardevice *pdev; |
| wait_queue_head_t irq_wait; |
| atomic_t irqc; |
| unsigned int flags; |
| int irqresponse; |
| unsigned char irqctl; |
| struct ieee1284_info state; |
| struct ieee1284_info saved_state; |
| long default_inactivity; |
| int index; |
| }; |
| |
| /* should we use PARDEVICE_MAX here? */ |
| static struct device *devices[PARPORT_MAX]; |
| |
| static DEFINE_IDA(ida_index); |
| |
| /* pp_struct.flags bitfields */ |
| #define PP_CLAIMED (1<<0) |
| #define PP_EXCL (1<<1) |
| |
| /* Other constants */ |
| #define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */ |
| #define PP_BUFFER_SIZE 1024 |
| #define PARDEVICE_MAX 8 |
| |
| static DEFINE_MUTEX(pp_do_mutex); |
| |
| /* define fixed sized ioctl cmd for y2038 migration */ |
| #define PPGETTIME32 _IOR(PP_IOCTL, 0x95, s32[2]) |
| #define PPSETTIME32 _IOW(PP_IOCTL, 0x96, s32[2]) |
| #define PPGETTIME64 _IOR(PP_IOCTL, 0x95, s64[2]) |
| #define PPSETTIME64 _IOW(PP_IOCTL, 0x96, s64[2]) |
| |
| static inline void pp_enable_irq(struct pp_struct *pp) |
| { |
| struct parport *port = pp->pdev->port; |
| |
| port->ops->enable_irq(port); |
| } |
| |
| static ssize_t pp_read(struct file *file, char __user *buf, size_t count, |
| loff_t *ppos) |
| { |
| unsigned int minor = iminor(file_inode(file)); |
| struct pp_struct *pp = file->private_data; |
| char *kbuffer; |
| ssize_t bytes_read = 0; |
| struct parport *pport; |
| int mode; |
| |
| if (!(pp->flags & PP_CLAIMED)) { |
| /* Don't have the port claimed */ |
| pr_debug(CHRDEV "%x: claim the port first\n", minor); |
| return -EINVAL; |
| } |
| |
| /* Trivial case. */ |
| if (count == 0) |
| return 0; |
| |
| kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); |
| if (!kbuffer) |
| return -ENOMEM; |
| pport = pp->pdev->port; |
| mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); |
| |
| parport_set_timeout(pp->pdev, |
| (file->f_flags & O_NONBLOCK) ? |
| PARPORT_INACTIVITY_O_NONBLOCK : |
| pp->default_inactivity); |
| |
| while (bytes_read == 0) { |
| ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE); |
| |
| if (mode == IEEE1284_MODE_EPP) { |
| /* various specials for EPP mode */ |
| int flags = 0; |
| size_t (*fn)(struct parport *, void *, size_t, int); |
| |
| if (pp->flags & PP_W91284PIC) |
| flags |= PARPORT_W91284PIC; |
| if (pp->flags & PP_FASTREAD) |
| flags |= PARPORT_EPP_FAST; |
| if (pport->ieee1284.mode & IEEE1284_ADDR) |
| fn = pport->ops->epp_read_addr; |
| else |
| fn = pport->ops->epp_read_data; |
| bytes_read = (*fn)(pport, kbuffer, need, flags); |
| } else { |
| bytes_read = parport_read(pport, kbuffer, need); |
| } |
| |
| if (bytes_read != 0) |
| break; |
| |
| if (file->f_flags & O_NONBLOCK) { |
| bytes_read = -EAGAIN; |
| break; |
| } |
| |
| if (signal_pending(current)) { |
| bytes_read = -ERESTARTSYS; |
| break; |
| } |
| |
| cond_resched(); |
| } |
| |
| parport_set_timeout(pp->pdev, pp->default_inactivity); |
| |
| if (bytes_read > 0 && copy_to_user(buf, kbuffer, bytes_read)) |
| bytes_read = -EFAULT; |
| |
| kfree(kbuffer); |
| pp_enable_irq(pp); |
| return bytes_read; |
| } |
| |
| static ssize_t pp_write(struct file *file, const char __user *buf, |
| size_t count, loff_t *ppos) |
| { |
| unsigned int minor = iminor(file_inode(file)); |
| struct pp_struct *pp = file->private_data; |
| char *kbuffer; |
| ssize_t bytes_written = 0; |
| ssize_t wrote; |
| int mode; |
| struct parport *pport; |
| |
| if (!(pp->flags & PP_CLAIMED)) { |
| /* Don't have the port claimed */ |
| pr_debug(CHRDEV "%x: claim the port first\n", minor); |
| return -EINVAL; |
| } |
| |
| kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL); |
| if (!kbuffer) |
| return -ENOMEM; |
| |
| pport = pp->pdev->port; |
| mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR); |
| |
| parport_set_timeout(pp->pdev, |
| (file->f_flags & O_NONBLOCK) ? |
| PARPORT_INACTIVITY_O_NONBLOCK : |
| pp->default_inactivity); |
| |
| while (bytes_written < count) { |
| ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE); |
| |
| if (copy_from_user(kbuffer, buf + bytes_written, n)) { |
| bytes_written = -EFAULT; |
| break; |
| } |
| |
| if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) { |
| /* do a fast EPP write */ |
| if (pport->ieee1284.mode & IEEE1284_ADDR) { |
| wrote = pport->ops->epp_write_addr(pport, |
| kbuffer, n, PARPORT_EPP_FAST); |
| } else { |
| wrote = pport->ops->epp_write_data(pport, |
| kbuffer, n, PARPORT_EPP_FAST); |
| } |
| } else { |
| wrote = parport_write(pp->pdev->port, kbuffer, n); |
| } |
| |
| if (wrote <= 0) { |
| if (!bytes_written) |
| bytes_written = wrote; |
| break; |
| } |
| |
| bytes_written += wrote; |
| |
| if (file->f_flags & O_NONBLOCK) { |
| if (!bytes_written) |
| bytes_written = -EAGAIN; |
| break; |
| } |
| |
| if (signal_pending(current)) |
| break; |
| |
| cond_resched(); |
| } |
| |
| parport_set_timeout(pp->pdev, pp->default_inactivity); |
| |
| kfree(kbuffer); |
| pp_enable_irq(pp); |
| return bytes_written; |
| } |
| |
| static void pp_irq(void *private) |
| { |
| struct pp_struct *pp = private; |
| |
| if (pp->irqresponse) { |
| parport_write_control(pp->pdev->port, pp->irqctl); |
| pp->irqresponse = 0; |
| } |
| |
| atomic_inc(&pp->irqc); |
| wake_up_interruptible(&pp->irq_wait); |
| } |
| |
| static int register_device(int minor, struct pp_struct *pp) |
| { |
| struct parport *port; |
| struct pardevice *pdev = NULL; |
| char *name; |
| struct pardev_cb ppdev_cb; |
| int rc = 0, index; |
| |
| name = kasprintf(GFP_KERNEL, CHRDEV "%x", minor); |
| if (name == NULL) |
| return -ENOMEM; |
| |
| port = parport_find_number(minor); |
| if (!port) { |
| pr_warn("%s: no associated port!\n", name); |
| rc = -ENXIO; |
| goto err; |
| } |
| |
| index = ida_simple_get(&ida_index, 0, 0, GFP_KERNEL); |
| memset(&ppdev_cb, 0, sizeof(ppdev_cb)); |
| ppdev_cb.irq_func = pp_irq; |
| ppdev_cb.flags = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0; |
| ppdev_cb.private = pp; |
| pdev = parport_register_dev_model(port, name, &ppdev_cb, index); |
| parport_put_port(port); |
| |
| if (!pdev) { |
| pr_warn("%s: failed to register device!\n", name); |
| rc = -ENXIO; |
| ida_simple_remove(&ida_index, index); |
| goto err; |
| } |
| |
| pp->pdev = pdev; |
| pp->index = index; |
| dev_dbg(&pdev->dev, "registered pardevice\n"); |
| err: |
| kfree(name); |
| return rc; |
| } |
| |
| static enum ieee1284_phase init_phase(int mode) |
| { |
| switch (mode & ~(IEEE1284_DEVICEID |
| | IEEE1284_ADDR)) { |
| case IEEE1284_MODE_NIBBLE: |
| case IEEE1284_MODE_BYTE: |
| return IEEE1284_PH_REV_IDLE; |
| } |
| return IEEE1284_PH_FWD_IDLE; |
| } |
| |
| static int pp_set_timeout(struct pardevice *pdev, long tv_sec, int tv_usec) |
| { |
| long to_jiffies; |
| |
| if ((tv_sec < 0) || (tv_usec < 0)) |
| return -EINVAL; |
| |
| to_jiffies = usecs_to_jiffies(tv_usec); |
| to_jiffies += tv_sec * HZ; |
| if (to_jiffies <= 0) |
| return -EINVAL; |
| |
| pdev->timeout = to_jiffies; |
| return 0; |
| } |
| |
| static int pp_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| { |
| unsigned int minor = iminor(file_inode(file)); |
| struct pp_struct *pp = file->private_data; |
| struct parport *port; |
| void __user *argp = (void __user *)arg; |
| |
| /* First handle the cases that don't take arguments. */ |
| switch (cmd) { |
| case PPCLAIM: |
| { |
| struct ieee1284_info *info; |
| int ret; |
| |
| if (pp->flags & PP_CLAIMED) { |
| dev_dbg(&pp->pdev->dev, "you've already got it!\n"); |
| return -EINVAL; |
| } |
| |
| /* Deferred device registration. */ |
| if (!pp->pdev) { |
| int err = register_device(minor, pp); |
| |
| if (err) |
| return err; |
| } |
| |
| ret = parport_claim_or_block(pp->pdev); |
| if (ret < 0) |
| return ret; |
| |
| pp->flags |= PP_CLAIMED; |
| |
| /* For interrupt-reporting to work, we need to be |
| * informed of each interrupt. */ |
| pp_enable_irq(pp); |
| |
| /* We may need to fix up the state machine. */ |
| 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; |
| pp->default_inactivity = parport_set_timeout(pp->pdev, 0); |
| parport_set_timeout(pp->pdev, pp->default_inactivity); |
| |
| return 0; |
| } |
| case PPEXCL: |
| if (pp->pdev) { |
| dev_dbg(&pp->pdev->dev, |
| "too late for PPEXCL; already registered\n"); |
| if (pp->flags & PP_EXCL) |
| /* But it's not really an error. */ |
| return 0; |
| /* There's no chance of making the driver happy. */ |
| return -EINVAL; |
| } |
| |
| /* Just remember to register the device exclusively |
| * when we finally do the registration. */ |
| pp->flags |= PP_EXCL; |
| return 0; |
| case PPSETMODE: |
| { |
| int mode; |
| |
| if (copy_from_user(&mode, argp, sizeof(mode))) |
| return -EFAULT; |
| /* FIXME: validate mode */ |
| pp->state.mode = mode; |
| pp->state.phase = init_phase(mode); |
| |
| if (pp->flags & PP_CLAIMED) { |
| pp->pdev->port->ieee1284.mode = mode; |
| pp->pdev->port->ieee1284.phase = pp->state.phase; |
| } |
| |
| return 0; |
| } |
| case PPGETMODE: |
| { |
| int mode; |
| |
| if (pp->flags & PP_CLAIMED) |
| mode = pp->pdev->port->ieee1284.mode; |
| else |
| mode = pp->state.mode; |
| |
| if (copy_to_user(argp, &mode, sizeof(mode))) |
| return -EFAULT; |
| return 0; |
| } |
| case PPSETPHASE: |
| { |
| int phase; |
| |
| if (copy_from_user(&phase, argp, sizeof(phase))) |
| return -EFAULT; |
| |
| /* FIXME: validate phase */ |
| pp->state.phase = phase; |
| |
| if (pp->flags & PP_CLAIMED) |
| pp->pdev->port->ieee1284.phase = phase; |
| |
| return 0; |
| } |
| case PPGETPHASE: |
| { |
| int phase; |
| |
| if (pp->flags & PP_CLAIMED) |
| phase = pp->pdev->port->ieee1284.phase; |
| else |
| phase = pp->state.phase; |
| if (copy_to_user(argp, &phase, sizeof(phase))) |
| return -EFAULT; |
| return 0; |
| } |
| case PPGETMODES: |
| { |
| unsigned int modes; |
| |
| port = parport_find_number(minor); |
| if (!port) |
| return -ENODEV; |
| |
| modes = port->modes; |
| parport_put_port(port); |
| if (copy_to_user(argp, &modes, sizeof(modes))) |
| return -EFAULT; |
| return 0; |
| } |
| case PPSETFLAGS: |
| { |
| int uflags; |
| |
| if (copy_from_user(&uflags, argp, sizeof(uflags))) |
| return -EFAULT; |
| pp->flags &= ~PP_FLAGMASK; |
| pp->flags |= (uflags & PP_FLAGMASK); |
| return 0; |
| } |
| case PPGETFLAGS: |
| { |
| int uflags; |
| |
| uflags = pp->flags & PP_FLAGMASK; |
| if (copy_to_user(argp, &uflags, sizeof(uflags))) |
| return -EFAULT; |
| return 0; |
| } |
| } /* end switch() */ |
| |
| /* Everything else requires the port to be claimed, so check |
| * that now. */ |
| if ((pp->flags & PP_CLAIMED) == 0) { |
| pr_debug(CHRDEV "%x: claim the port first\n", minor); |
| return -EINVAL; |
| } |
| |
| port = pp->pdev->port; |
| switch (cmd) { |
| struct ieee1284_info *info; |
| unsigned char reg; |
| unsigned char mask; |
| int mode; |
| s32 time32[2]; |
| s64 time64[2]; |
| struct timespec64 ts; |
| int ret; |
| |
| case PPRSTATUS: |
| reg = parport_read_status(port); |
| if (copy_to_user(argp, ®, sizeof(reg))) |
| return -EFAULT; |
| return 0; |
| case PPRDATA: |
| reg = parport_read_data(port); |
| if (copy_to_user(argp, ®, sizeof(reg))) |
| return -EFAULT; |
| 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); |
| ida_simple_remove(&ida_index, pp->index); |
| pp->pdev = NULL; |
| pr_debug(CHRDEV "%x: unregistered pardevice\n", minor); |
| } |
| |
| kfree(pp); |
| |
| return 0; |
| } |
| |
| /* No kernel lock held - fine */ |
| static __poll_t pp_poll(struct file *file, poll_table *wait) |
| { |
| struct pp_struct *pp = file->private_data; |
| __poll_t mask = 0; |
| |
| poll_wait(file, &pp->irq_wait, wait); |
| if (atomic_read(&pp->irqc)) |
| mask |= EPOLLIN | EPOLLRDNORM; |
| |
| 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); |