From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- drivers/char/ppdev.c | 885 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 885 insertions(+) create mode 100644 drivers/char/ppdev.c (limited to 'drivers/char/ppdev.c') diff --git a/drivers/char/ppdev.c b/drivers/char/ppdev.c new file mode 100644 index 000000000..6da817b98 --- /dev/null +++ b/drivers/char/ppdev.c @@ -0,0 +1,885 @@ +// 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 + * + * 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 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 , 03/01/2001. + * Added GETFLAGS/SETFLAGS ioctls, Fred Barnes, 04/2001 + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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_free_name; + } + + index = ida_alloc(&ida_index, GFP_KERNEL); + if (index < 0) { + pr_warn("%s: failed to get index!\n", name); + rc = index; + goto err_put_port; + } + + 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); + + if (!pdev) { + pr_warn("%s: failed to register device!\n", name); + rc = -ENXIO; + ida_free(&ida_index, index); + goto err_put_port; + } + + pp->pdev = pdev; + pp->index = index; + dev_dbg(&pdev->dev, "registered pardevice\n"); +err_put_port: + parport_put_port(port); +err_free_name: + 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; + struct ieee1284_info *info; + unsigned char reg; + unsigned char mask; + int mode; + s32 time32[2]; + s64 time64[2]; + struct timespec64 ts; + int ret; + + /* First handle the cases that don't take arguments. */ + switch (cmd) { + case PPCLAIM: + { + 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) { + 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; + + if ((time32[0] < 0) || (time32[1] < 0)) + return -EINVAL; + + return pp_set_timeout(pp->pdev, time32[0], time32[1]); + + case PPSETTIME64: + if (copy_from_user(time64, argp, sizeof(time64))) + return -EFAULT; + + if ((time64[0] < 0) || (time64[1] < 0)) + return -EINVAL; + + if (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall()) + time64[1] >>= 32; + + 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 (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 (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall()) + time64[1] <<= 32; + + 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; +} + +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_obj(struct pp_struct); + 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) && pp->pdev) { + 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_free(&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 const struct class ppdev_class = { + .name = CHRDEV, +}; + +static const struct file_operations pp_fops = { + .owner = THIS_MODULE, + .read = pp_read, + .write = pp_write, + .poll = pp_poll, + .unlocked_ioctl = pp_ioctl, + .compat_ioctl = compat_ptr_ioctl, + .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, +}; + +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; + } + err = class_register(&ppdev_class); + if (err) + 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_unregister(&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_unregister(&ppdev_class); + unregister_chrdev(PP_MAJOR, CHRDEV); +} + +module_init(ppdev_init); +module_exit(ppdev_cleanup); + +MODULE_DESCRIPTION("Support for user-space parallel port device drivers"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR); -- cgit v1.3.1