Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * Provide access to virtual console memory.
 * /dev/vcs: the screen as it is being viewed right now (possibly scrolled)
 * /dev/vcsN: the screen of /dev/ttyN (1 <= N <= 63)
 *            [minor: N]
 *
 * /dev/vcsaN: idem, but including attributes, and prefixed with
 *	the 4 bytes lines,columns,x,y (as screendump used to give).
 *	Attribute/character pair is in native endianity.
 *            [minor: N+128]
 *
 * /dev/vcsuN: similar to /dev/vcsaN but using 4-byte unicode values
 *	instead of 1-byte screen glyph values.
 *            [minor: N+64]
 *
 * /dev/vcsuaN: same idea as /dev/vcsaN for unicode (not yet implemented).
 *
 * This replaces screendump and part of selection, so that the system
 * administrator can control access using file system permissions.
 *
 * aeb@cwi.nl - efter Friedas begravelse - 950211
 *
 * machek@k332.feld.cvut.cz - modified not to send characters to wrong console
 *	 - fixed some fatal off-by-one bugs (0-- no longer == -1 -> looping and looping and looping...)
 *	 - making it shorter - scr_readw are macros which expand in PRETTY long code
 */
 
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/tty.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/vt_kern.h>
#include <linux/selection.h>
#include <linux/kbd_kern.h>
#include <linux/console.h>
#include <linux/device.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/poll.h>
#include <linux/signal.h>
#include <linux/slab.h>
#include <linux/notifier.h>
 
#include <linux/uaccess.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
 
#define HEADER_SIZE	4u
#define CON_BUF_SIZE (CONFIG_BASE_SMALL ? 256 : PAGE_SIZE)
 
/*
 * Our minor space:
 *
 *   0 ... 63	glyph mode without attributes
 *  64 ... 127	unicode mode without attributes
 * 128 ... 191	glyph mode with attributes
 * 192 ... 255	unused (reserved for unicode with attributes)
 *
 * This relies on MAX_NR_CONSOLES being  <= 63, meaning 63 actual consoles
 * with minors 0, 64, 128 and 192 being proxies for the foreground console.
 */
#if MAX_NR_CONSOLES > 63
#warning "/dev/vcs* devices may not accommodate more than 63 consoles"
#endif
 
#define console(inode)		(iminor(inode) & 63)
#define use_unicode(inode)	(iminor(inode) & 64)
#define use_attributes(inode)	(iminor(inode) & 128)
 
 
struct vcs_poll_data {
<------>struct notifier_block notifier;
<------>unsigned int cons_num;
<------>int event;
<------>wait_queue_head_t waitq;
<------>struct fasync_struct *fasync;
};
 
static int
vcs_notifier(struct notifier_block *nb, unsigned long code, void *_param)
{
<------>struct vt_notifier_param *param = _param;
<------>struct vc_data *vc = param->vc;
<------>struct vcs_poll_data *poll =
<------><------>container_of(nb, struct vcs_poll_data, notifier);
<------>int currcons = poll->cons_num;
<------>int fa_band;
 
<------>switch (code) {
<------>case VT_UPDATE:
<------><------>fa_band = POLL_PRI;
<------><------>break;
<------>case VT_DEALLOCATE:
<------><------>fa_band = POLL_HUP;
<------><------>break;
<------>default:
<------><------>return NOTIFY_DONE;
<------>}
 
<------>if (currcons == 0)
<------><------>currcons = fg_console;
<------>else
<------><------>currcons--;
<------>if (currcons != vc->vc_num)
<------><------>return NOTIFY_DONE;
 
<------>poll->event = code;
<------>wake_up_interruptible(&poll->waitq);
<------>kill_fasync(&poll->fasync, SIGIO, fa_band);
<------>return NOTIFY_OK;
}
 
static void
vcs_poll_data_free(struct vcs_poll_data *poll)
{
<------>unregister_vt_notifier(&poll->notifier);
<------>kfree(poll);
}
 
static struct vcs_poll_data *
vcs_poll_data_get(struct file *file)
{
<------>struct vcs_poll_data *poll = file->private_data, *kill = NULL;
 
<------>if (poll)
<------><------>return poll;
 
<------>poll = kzalloc(sizeof(*poll), GFP_KERNEL);
<------>if (!poll)
<------><------>return NULL;
<------>poll->cons_num = console(file_inode(file));
<------>init_waitqueue_head(&poll->waitq);
<------>poll->notifier.notifier_call = vcs_notifier;
<------>/*
<------> * In order not to lose any update event, we must pretend one might
<------> * have occurred before we have a chance to register our notifier.
<------> * This is also how user space has come to detect which kernels
<------> * support POLLPRI on /dev/vcs* devices i.e. using poll() with
<------> * POLLPRI and a zero timeout.
<------> */
<------>poll->event = VT_UPDATE;
 
<------>if (register_vt_notifier(&poll->notifier) != 0) {
<------><------>kfree(poll);
<------><------>return NULL;
<------>}
 
<------>/*
<------> * This code may be called either through ->poll() or ->fasync().
<------> * If we have two threads using the same file descriptor, they could
<------> * both enter this function, both notice that the structure hasn't
<------> * been allocated yet and go ahead allocating it in parallel, but
<------> * only one of them must survive and be shared otherwise we'd leak
<------> * memory with a dangling notifier callback.
<------> */
<------>spin_lock(&file->f_lock);
<------>if (!file->private_data) {
<------><------>file->private_data = poll;
<------>} else {
<------><------>/* someone else raced ahead of us */
<------><------>kill = poll;
<------><------>poll = file->private_data;
<------>}
<------>spin_unlock(&file->f_lock);
<------>if (kill)
<------><------>vcs_poll_data_free(kill);
 
<------>return poll;
}
 
/**
 * vcs_vc -- return VC for @inode
 * @inode: inode for which to return a VC
 * @viewed: returns whether this console is currently foreground (viewed)
 *
 * Must be called with console_lock.
 */
static struct vc_data *vcs_vc(struct inode *inode, bool *viewed)
{
<------>unsigned int currcons = console(inode);
 
<------>WARN_CONSOLE_UNLOCKED();
 
<------>if (currcons == 0) {
<------><------>currcons = fg_console;
<------><------>if (viewed)
<------><------><------>*viewed = true;
<------>} else {
<------><------>currcons--;
<------><------>if (viewed)
<------><------><------>*viewed = false;
<------>}
<------>return vc_cons[currcons].d;
}
 
/**
 * vcs_size -- return size for a VC in @vc
 * @vc: which VC
 * @attr: does it use attributes?
 * @unicode: is it unicode?
 *
 * Must be called with console_lock.
 */
static int vcs_size(const struct vc_data *vc, bool attr, bool unicode)
{
<------>int size;
 
<------>WARN_CONSOLE_UNLOCKED();
 
<------>size = vc->vc_rows * vc->vc_cols;
 
<------>if (attr) {
<------><------>if (unicode)
<------><------><------>return -EOPNOTSUPP;
 
<------><------>size = 2 * size + HEADER_SIZE;
<------>} else if (unicode)
<------><------>size *= 4;
 
<------>return size;
}
 
static loff_t vcs_lseek(struct file *file, loff_t offset, int orig)
{
<------>struct inode *inode = file_inode(file);
<------>struct vc_data *vc;
<------>int size;
 
<------>console_lock();
<------>vc = vcs_vc(inode, NULL);
<------>if (!vc) {
<------><------>console_unlock();
<------><------>return -ENXIO;
<------>}
 
<------>size = vcs_size(vc, use_attributes(inode), use_unicode(inode));
<------>console_unlock();
<------>if (size < 0)
<------><------>return size;
<------>return fixed_size_llseek(file, offset, orig, size);
}
 
static int vcs_read_buf_uni(struct vc_data *vc, char *con_buf,
<------><------>unsigned int pos, unsigned int count, bool viewed)
{
<------>unsigned int nr, row, col, maxcol = vc->vc_cols;
<------>int ret;
 
<------>ret = vc_uniscr_check(vc);
<------>if (ret)
<------><------>return ret;
 
<------>pos /= 4;
<------>row = pos / maxcol;
<------>col = pos % maxcol;
<------>nr = maxcol - col;
<------>do {
<------><------>if (nr > count / 4)
<------><------><------>nr = count / 4;
<------><------>vc_uniscr_copy_line(vc, con_buf, viewed, row, col, nr);
<------><------>con_buf += nr * 4;
<------><------>count -= nr * 4;
<------><------>row++;
<------><------>col = 0;
<------><------>nr = maxcol;
<------>} while (count);
 
<------>return 0;
}
 
static void vcs_read_buf_noattr(const struct vc_data *vc, char *con_buf,
<------><------>unsigned int pos, unsigned int count, bool viewed)
{
<------>u16 *org;
<------>unsigned int col, maxcol = vc->vc_cols;
 
<------>org = screen_pos(vc, pos, viewed);
<------>col = pos % maxcol;
<------>pos += maxcol - col;
 
<------>while (count-- > 0) {
<------><------>*con_buf++ = (vcs_scr_readw(vc, org++) & 0xff);
<------><------>if (++col == maxcol) {
<------><------><------>org = screen_pos(vc, pos, viewed);
<------><------><------>col = 0;
<------><------><------>pos += maxcol;
<------><------>}
<------>}
}
 
static unsigned int vcs_read_buf(const struct vc_data *vc, char *con_buf,
<------><------>unsigned int pos, unsigned int count, bool viewed,
<------><------>unsigned int *skip)
{
<------>u16 *org, *con_buf16;
<------>unsigned int col, maxcol = vc->vc_cols;
<------>unsigned int filled = count;
 
<------>if (pos < HEADER_SIZE) {
<------><------>/* clamp header values if they don't fit */
<------><------>con_buf[0] = min(vc->vc_rows, 0xFFu);
<------><------>con_buf[1] = min(vc->vc_cols, 0xFFu);
<------><------>getconsxy(vc, con_buf + 2);
 
<------><------>*skip += pos;
<------><------>count += pos;
<------><------>if (count > CON_BUF_SIZE) {
<------><------><------>count = CON_BUF_SIZE;
<------><------><------>filled = count - pos;
<------><------>}
 
<------><------>/* Advance state pointers and move on. */
<------><------>count -= min(HEADER_SIZE, count);
<------><------>pos = HEADER_SIZE;
<------><------>con_buf += HEADER_SIZE;
<------><------>/* If count >= 0, then pos is even... */
<------>} else if (pos & 1) {
<------><------>/*
<------><------> * Skip first byte for output if start address is odd. Update
<------><------> * region sizes up/down depending on free space in buffer.
<------><------> */
<------><------>(*skip)++;
<------><------>if (count < CON_BUF_SIZE)
<------><------><------>count++;
<------><------>else
<------><------><------>filled--;
<------>}
 
<------>if (!count)
<------><------>return filled;
 
<------>pos -= HEADER_SIZE;
<------>pos /= 2;
<------>col = pos % maxcol;
 
<------>org = screen_pos(vc, pos, viewed);
<------>pos += maxcol - col;
 
<------>/*
<------> * Buffer has even length, so we can always copy character + attribute.
<------> * We do not copy last byte to userspace if count is odd.
<------> */
<------>count = (count + 1) / 2;
<------>con_buf16 = (u16 *)con_buf;
 
<------>while (count) {
<------><------>*con_buf16++ = vcs_scr_readw(vc, org++);
<------><------>count--;
<------><------>if (++col == maxcol) {
<------><------><------>org = screen_pos(vc, pos, viewed);
<------><------><------>col = 0;
<------><------><------>pos += maxcol;
<------><------>}
<------>}
 
<------>return filled;
}
 
static ssize_t
vcs_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
<------>struct inode *inode = file_inode(file);
<------>struct vc_data *vc;
<------>struct vcs_poll_data *poll;
<------>unsigned int read;
<------>ssize_t ret;
<------>char *con_buf;
<------>loff_t pos;
<------>bool viewed, attr, uni_mode;
 
<------>con_buf = (char *) __get_free_page(GFP_KERNEL);
<------>if (!con_buf)
<------><------>return -ENOMEM;
 
<------>pos = *ppos;
 
<------>/* Select the proper current console and verify
<------> * sanity of the situation under the console lock.
<------> */
<------>console_lock();
 
<------>uni_mode = use_unicode(inode);
<------>attr = use_attributes(inode);
<------>ret = -ENXIO;
<------>vc = vcs_vc(inode, &viewed);
<------>if (!vc)
<------><------>goto unlock_out;
 
<------>ret = -EINVAL;
<------>if (pos < 0)
<------><------>goto unlock_out;
<------>/* we enforce 32-bit alignment for pos and count in unicode mode */
<------>if (uni_mode && (pos | count) & 3)
<------><------>goto unlock_out;
 
<------>poll = file->private_data;
<------>if (count && poll)
<------><------>poll->event = 0;
<------>read = 0;
<------>ret = 0;
<------>while (count) {
<------><------>unsigned int this_round, skip = 0;
<------><------>int size;
 
<------><------>/* Check whether we are above size each round,
<------><------> * as copy_to_user at the end of this loop
<------><------> * could sleep.
<------><------> */
<------><------>size = vcs_size(vc, attr, uni_mode);
<------><------>if (size < 0) {
<------><------><------>if (read)
<------><------><------><------>break;
<------><------><------>ret = size;
<------><------><------>goto unlock_out;
<------><------>}
<------><------>if (pos >= size)
<------><------><------>break;
<------><------>if (count > size - pos)
<------><------><------>count = size - pos;
 
<------><------>this_round = count;
<------><------>if (this_round > CON_BUF_SIZE)
<------><------><------>this_round = CON_BUF_SIZE;
 
<------><------>/* Perform the whole read into the local con_buf.
<------><------> * Then we can drop the console spinlock and safely
<------><------> * attempt to move it to userspace.
<------><------> */
 
<------><------>if (uni_mode) {
<------><------><------>ret = vcs_read_buf_uni(vc, con_buf, pos, this_round,
<------><------><------><------><------>viewed);
<------><------><------>if (ret)
<------><------><------><------>break;
<------><------>} else if (!attr) {
<------><------><------>vcs_read_buf_noattr(vc, con_buf, pos, this_round,
<------><------><------><------><------>viewed);
<------><------>} else {
<------><------><------>this_round = vcs_read_buf(vc, con_buf, pos, this_round,
<------><------><------><------><------>viewed, &skip);
<------><------>}
 
<------><------>/* Finally, release the console semaphore while we push
<------><------> * all the data to userspace from our temporary buffer.
<------><------> *
<------><------> * AKPM: Even though it's a semaphore, we should drop it because
<------><------> * the pagefault handling code may want to call printk().
<------><------> */
 
<------><------>console_unlock();
<------><------>ret = copy_to_user(buf, con_buf + skip, this_round);
<------><------>console_lock();
 
<------><------>if (ret) {
<------><------><------>read += this_round - ret;
<------><------><------>ret = -EFAULT;
<------><------><------>break;
<------><------>}
<------><------>buf += this_round;
<------><------>pos += this_round;
<------><------>read += this_round;
<------><------>count -= this_round;
<------>}
<------>*ppos += read;
<------>if (read)
<------><------>ret = read;
unlock_out:
<------>console_unlock();
<------>free_page((unsigned long) con_buf);
<------>return ret;
}
 
static u16 *vcs_write_buf_noattr(struct vc_data *vc, const char *con_buf,
<------><------>unsigned int pos, unsigned int count, bool viewed, u16 **org0)
{
<------>u16 *org;
<------>unsigned int col, maxcol = vc->vc_cols;
 
<------>*org0 = org = screen_pos(vc, pos, viewed);
<------>col = pos % maxcol;
<------>pos += maxcol - col;
 
<------>while (count > 0) {
<------><------>unsigned char c = *con_buf++;
 
<------><------>count--;
<------><------>vcs_scr_writew(vc,
<------><------><------>       (vcs_scr_readw(vc, org) & 0xff00) | c, org);
<------><------>org++;
<------><------>if (++col == maxcol) {
<------><------><------>org = screen_pos(vc, pos, viewed);
<------><------><------>col = 0;
<------><------><------>pos += maxcol;
<------><------>}
<------>}
 
<------>return org;
}
 
/*
 * Compilers (gcc 10) are unable to optimize the swap in cpu_to_le16. So do it
 * the poor man way.
 */
static inline u16 vc_compile_le16(u8 hi, u8 lo)
{
#ifdef __BIG_ENDIAN
<------>return (lo << 8u) | hi;
#else
<------>return (hi << 8u) | lo;
#endif
}
 
static u16 *vcs_write_buf(struct vc_data *vc, const char *con_buf,
<------><------>unsigned int pos, unsigned int count, bool viewed, u16 **org0)
{
<------>u16 *org;
<------>unsigned int col, maxcol = vc->vc_cols;
<------>unsigned char c;
 
<------>/* header */
<------>if (pos < HEADER_SIZE) {
<------><------>char header[HEADER_SIZE];
 
<------><------>getconsxy(vc, header + 2);
<------><------>while (pos < HEADER_SIZE && count > 0) {
<------><------><------>count--;
<------><------><------>header[pos++] = *con_buf++;
<------><------>}
<------><------>if (!viewed)
<------><------><------>putconsxy(vc, header + 2);
<------>}
 
<------>if (!count)
<------><------>return NULL;
 
<------>pos -= HEADER_SIZE;
<------>col = (pos/2) % maxcol;
 
<------>*org0 = org = screen_pos(vc, pos/2, viewed);
 
<------>/* odd pos -- the first single character */
<------>if (pos & 1) {
<------><------>count--;
<------><------>c = *con_buf++;
<------><------>vcs_scr_writew(vc, vc_compile_le16(c, vcs_scr_readw(vc, org)),
<------><------><------><------>org);
<------><------>org++;
<------><------>pos++;
<------><------>if (++col == maxcol) {
<------><------><------>org = screen_pos(vc, pos/2, viewed);
<------><------><------>col = 0;
<------><------>}
<------>}
 
<------>pos /= 2;
<------>pos += maxcol - col;
 
<------>/* even pos -- handle attr+character pairs */
<------>while (count > 1) {
<------><------>unsigned short w;
 
<------><------>w = get_unaligned(((unsigned short *)con_buf));
<------><------>vcs_scr_writew(vc, w, org++);
<------><------>con_buf += 2;
<------><------>count -= 2;
<------><------>if (++col == maxcol) {
<------><------><------>org = screen_pos(vc, pos, viewed);
<------><------><------>col = 0;
<------><------><------>pos += maxcol;
<------><------>}
<------>}
 
<------>if (!count)
<------><------>return org;
 
<------>/* odd pos -- the remaining character */
<------>c = *con_buf++;
<------>vcs_scr_writew(vc, vc_compile_le16(vcs_scr_readw(vc, org) >> 8, c),
<------><------><------><------>org);
 
<------>return org;
}
 
static ssize_t
vcs_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
{
<------>struct inode *inode = file_inode(file);
<------>struct vc_data *vc;
<------>char *con_buf;
<------>u16 *org0, *org;
<------>unsigned int written;
<------>int size;
<------>ssize_t ret;
<------>loff_t pos;
<------>bool viewed, attr;
 
<------>if (use_unicode(inode))
<------><------>return -EOPNOTSUPP;
 
<------>con_buf = (char *) __get_free_page(GFP_KERNEL);
<------>if (!con_buf)
<------><------>return -ENOMEM;
 
<------>pos = *ppos;
 
<------>/* Select the proper current console and verify
<------> * sanity of the situation under the console lock.
<------> */
<------>console_lock();
 
<------>attr = use_attributes(inode);
<------>ret = -ENXIO;
<------>vc = vcs_vc(inode, &viewed);
<------>if (!vc)
<------><------>goto unlock_out;
 
<------>size = vcs_size(vc, attr, false);
<------>if (size < 0) {
<------><------>ret = size;
<------><------>goto unlock_out;
<------>}
<------>ret = -EINVAL;
<------>if (pos < 0 || pos > size)
<------><------>goto unlock_out;
<------>if (count > size - pos)
<------><------>count = size - pos;
<------>written = 0;
<------>while (count) {
<------><------>unsigned int this_round = count;
 
<------><------>if (this_round > CON_BUF_SIZE)
<------><------><------>this_round = CON_BUF_SIZE;
 
<------><------>/* Temporarily drop the console lock so that we can read
<------><------> * in the write data from userspace safely.
<------><------> */
<------><------>console_unlock();
<------><------>ret = copy_from_user(con_buf, buf, this_round);
<------><------>console_lock();
 
<------><------>if (ret) {
<------><------><------>this_round -= ret;
<------><------><------>if (!this_round) {
<------><------><------><------>/* Abort loop if no data were copied. Otherwise
<------><------><------><------> * fail with -EFAULT.
<------><------><------><------> */
<------><------><------><------>if (written)
<------><------><------><------><------>break;
<------><------><------><------>ret = -EFAULT;
<------><------><------><------>goto unlock_out;
<------><------><------>}
<------><------>}
 
<------><------>/* The vcs_size might have changed while we slept to grab
<------><------> * the user buffer, so recheck.
<------><------> * Return data written up to now on failure.
<------><------> */
<------><------>size = vcs_size(vc, attr, false);
<------><------>if (size < 0) {
<------><------><------>if (written)
<------><------><------><------>break;
<------><------><------>ret = size;
<------><------><------>goto unlock_out;
<------><------>}
<------><------>if (pos >= size)
<------><------><------>break;
<------><------>if (this_round > size - pos)
<------><------><------>this_round = size - pos;
 
<------><------>/* OK, now actually push the write to the console
<------><------> * under the lock using the local kernel buffer.
<------><------> */
 
<------><------>if (attr)
<------><------><------>org = vcs_write_buf(vc, con_buf, pos, this_round,
<------><------><------><------><------>viewed, &org0);
<------><------>else
<------><------><------>org = vcs_write_buf_noattr(vc, con_buf, pos, this_round,
<------><------><------><------><------>viewed, &org0);
 
<------><------>count -= this_round;
<------><------>written += this_round;
<------><------>buf += this_round;
<------><------>pos += this_round;
<------><------>if (org)
<------><------><------>update_region(vc, (unsigned long)(org0), org - org0);
<------>}
<------>*ppos += written;
<------>ret = written;
<------>if (written)
<------><------>vcs_scr_updated(vc);
 
unlock_out:
<------>console_unlock();
<------>free_page((unsigned long) con_buf);
<------>return ret;
}
 
static __poll_t
vcs_poll(struct file *file, poll_table *wait)
{
<------>struct vcs_poll_data *poll = vcs_poll_data_get(file);
<------>__poll_t ret = DEFAULT_POLLMASK|EPOLLERR;
 
<------>if (poll) {
<------><------>poll_wait(file, &poll->waitq, wait);
<------><------>switch (poll->event) {
<------><------>case VT_UPDATE:
<------><------><------>ret = DEFAULT_POLLMASK|EPOLLPRI;
<------><------><------>break;
<------><------>case VT_DEALLOCATE:
<------><------><------>ret = DEFAULT_POLLMASK|EPOLLHUP|EPOLLERR;
<------><------><------>break;
<------><------>case 0:
<------><------><------>ret = DEFAULT_POLLMASK;
<------><------><------>break;
<------><------>}
<------>}
<------>return ret;
}
 
static int
vcs_fasync(int fd, struct file *file, int on)
{
<------>struct vcs_poll_data *poll = file->private_data;
 
<------>if (!poll) {
<------><------>/* don't allocate anything if all we want is disable fasync */
<------><------>if (!on)
<------><------><------>return 0;
<------><------>poll = vcs_poll_data_get(file);
<------><------>if (!poll)
<------><------><------>return -ENOMEM;
<------>}
 
<------>return fasync_helper(fd, file, on, &poll->fasync);
}
 
static int
vcs_open(struct inode *inode, struct file *filp)
{
<------>unsigned int currcons = console(inode);
<------>bool attr = use_attributes(inode);
<------>bool uni_mode = use_unicode(inode);
<------>int ret = 0;
 
<------>/* we currently don't support attributes in unicode mode */
<------>if (attr && uni_mode)
<------><------>return -EOPNOTSUPP;
 
<------>console_lock();
<------>if(currcons && !vc_cons_allocated(currcons-1))
<------><------>ret = -ENXIO;
<------>console_unlock();
<------>return ret;
}
 
static int vcs_release(struct inode *inode, struct file *file)
{
<------>struct vcs_poll_data *poll = file->private_data;
 
<------>if (poll)
<------><------>vcs_poll_data_free(poll);
<------>return 0;
}
 
static const struct file_operations vcs_fops = {
<------>.llseek		= vcs_lseek,
<------>.read		= vcs_read,
<------>.write		= vcs_write,
<------>.poll		= vcs_poll,
<------>.fasync		= vcs_fasync,
<------>.open		= vcs_open,
<------>.release	= vcs_release,
};
 
static struct class *vc_class;
 
void vcs_make_sysfs(int index)
{
<------>device_create(vc_class, NULL, MKDEV(VCS_MAJOR, index + 1), NULL,
<------><------>      "vcs%u", index + 1);
<------>device_create(vc_class, NULL, MKDEV(VCS_MAJOR, index + 65), NULL,
<------><------>      "vcsu%u", index + 1);
<------>device_create(vc_class, NULL, MKDEV(VCS_MAJOR, index + 129), NULL,
<------><------>      "vcsa%u", index + 1);
}
 
void vcs_remove_sysfs(int index)
{
<------>device_destroy(vc_class, MKDEV(VCS_MAJOR, index + 1));
<------>device_destroy(vc_class, MKDEV(VCS_MAJOR, index + 65));
<------>device_destroy(vc_class, MKDEV(VCS_MAJOR, index + 129));
}
 
int __init vcs_init(void)
{
<------>unsigned int i;
 
<------>if (register_chrdev(VCS_MAJOR, "vcs", &vcs_fops))
<------><------>panic("unable to get major %d for vcs device", VCS_MAJOR);
<------>vc_class = class_create(THIS_MODULE, "vc");
 
<------>device_create(vc_class, NULL, MKDEV(VCS_MAJOR, 0), NULL, "vcs");
<------>device_create(vc_class, NULL, MKDEV(VCS_MAJOR, 64), NULL, "vcsu");
<------>device_create(vc_class, NULL, MKDEV(VCS_MAJOR, 128), NULL, "vcsa");
<------>for (i = 0; i < MIN_NR_CONSOLES; i++)
<------><------>vcs_make_sysfs(i);
<------>return 0;
}