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Input: Add support for 32-bit emulation on 64-bit platforms for evdev.
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Signed-off-by: Juergen Kreileder <jk@blackdown.de>
Signed-off-by: Vojtech Pavlik <vojtech@suse.cz>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
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Juergen Kreileder authored and Dmitry Torokhov committed May 29, 2005
1 parent 024ac44 commit 52658bb
Showing 1 changed file with 266 additions and 2 deletions.
268 changes: 266 additions & 2 deletions drivers/input/evdev.c
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,7 @@
#include <linux/smp_lock.h>
#include <linux/device.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/compat.h>

struct evdev {
int exist;
Expand Down Expand Up @@ -145,6 +146,41 @@ static int evdev_open(struct inode * inode, struct file * file)
return 0;
}

#ifdef CONFIG_COMPAT
struct input_event_compat {
struct compat_timeval time;
__u16 type;
__u16 code;
__s32 value;
};

#ifdef CONFIG_X86_64
# define COMPAT_TEST test_thread_flag(TIF_IA32)
#elif defined(CONFIG_IA64)
# define COMPAT_TEST IS_IA32_PROCESS(ia64_task_regs(current))
#elif defined(CONFIG_ARCH_S390)
# define COMPAT_TEST test_thread_flag(TIF_31BIT)
#else
# define COMPAT_TEST test_thread_flag(TIF_32BIT)
#endif

static ssize_t evdev_write_compat(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
{
struct evdev_list *list = file->private_data;
struct input_event_compat event;
int retval = 0;

while (retval < count) {
if (copy_from_user(&event, buffer + retval, sizeof(struct input_event_compat)))
return -EFAULT;
input_event(list->evdev->handle.dev, event.type, event.code, event.value);
retval += sizeof(struct input_event_compat);
}

return retval;
}
#endif

static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
{
struct evdev_list *list = file->private_data;
Expand All @@ -153,6 +189,11 @@ static ssize_t evdev_write(struct file * file, const char __user * buffer, size_

if (!list->evdev->exist) return -ENODEV;

#ifdef CONFIG_COMPAT
if (COMPAT_TEST)
return evdev_write_compat(file, buffer, count, ppos);
#endif

while (retval < count) {

if (copy_from_user(&event, buffer + retval, sizeof(struct input_event)))
Expand All @@ -164,11 +205,56 @@ static ssize_t evdev_write(struct file * file, const char __user * buffer, size_
return retval;
}

#ifdef CONFIG_COMPAT
static ssize_t evdev_read_compat(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
{
struct evdev_list *list = file->private_data;
int retval;

if (count < sizeof(struct input_event_compat))
return -EINVAL;

if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
return -EAGAIN;

retval = wait_event_interruptible(list->evdev->wait,
list->head != list->tail || (!list->evdev->exist));

if (retval)
return retval;

if (!list->evdev->exist)
return -ENODEV;

while (list->head != list->tail && retval + sizeof(struct input_event_compat) <= count) {
struct input_event *event = (struct input_event *) list->buffer + list->tail;
struct input_event_compat event_compat;
event_compat.time.tv_sec = event->time.tv_sec;
event_compat.time.tv_usec = event->time.tv_usec;
event_compat.type = event->type;
event_compat.code = event->code;
event_compat.value = event->value;

if (copy_to_user(buffer + retval, &event_compat,
sizeof(struct input_event_compat))) return -EFAULT;
list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
retval += sizeof(struct input_event_compat);
}

return retval;
}
#endif

static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
{
struct evdev_list *list = file->private_data;
int retval;

#ifdef CONFIG_COMPAT
if (COMPAT_TEST)
return evdev_read_compat(file, buffer, count, ppos);
#endif

if (count < sizeof(struct input_event))
return -EINVAL;

Expand Down Expand Up @@ -203,7 +289,7 @@ static unsigned int evdev_poll(struct file *file, poll_table *wait)
(list->evdev->exist ? 0 : (POLLHUP | POLLERR));
}

static int evdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct evdev_list *list = file->private_data;
struct evdev *evdev = list->evdev;
Expand Down Expand Up @@ -389,14 +475,192 @@ static int evdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
return -EINVAL;
}

#ifdef CONFIG_COMPAT

#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
#define NBITS_COMPAT(x) ((((x)-1)/BITS_PER_LONG_COMPAT)+1)
#define OFF_COMPAT(x) ((x)%BITS_PER_LONG_COMPAT)
#define BIT_COMPAT(x) (1UL<<OFF_COMPAT(x))
#define LONG_COMPAT(x) ((x)/BITS_PER_LONG_COMPAT)
#define test_bit_compat(bit, array) ((array[LONG_COMPAT(bit)] >> OFF_COMPAT(bit)) & 1)

static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
{
struct evdev_list *list = file->private_data;
struct evdev *evdev = list->evdev;
struct input_dev *dev = evdev->handle.dev;
struct input_absinfo abs;
void __user *p = compat_ptr(arg);
int i;

if (!evdev->exist) return -ENODEV;

switch (cmd) {

case EVIOCGVERSION:
case EVIOCGID:
case EVIOCGKEYCODE:
case EVIOCSKEYCODE:
case EVIOCSFF:
case EVIOCRMFF:
case EVIOCGEFFECTS:
case EVIOCGRAB:
return evdev_ioctl(file, cmd, (unsigned long) p);

default:

if (_IOC_TYPE(cmd) != 'E' || _IOC_DIR(cmd) != _IOC_READ)
return -EINVAL;

if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {

long *bits;
int len;

switch (_IOC_NR(cmd) & EV_MAX) {
case 0: bits = dev->evbit; len = EV_MAX; break;
case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
case EV_REL: bits = dev->relbit; len = REL_MAX; break;
case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
default: return -EINVAL;
}
len = NBITS_COMPAT(len) * sizeof(compat_long_t);
if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
#ifdef __BIG_ENDIAN
for (i = 0; i < len / sizeof(compat_long_t); i++)
if (copy_to_user((compat_long_t*) p + i,
(compat_long_t*) bits + i + 1 - ((i % 2) << 1),
sizeof(compat_long_t)))
return -EFAULT;
return len;
#else
return copy_to_user(p, bits, len) ? -EFAULT : len;
#endif
}

if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) {
int len;
len = NBITS_COMPAT(KEY_MAX) * sizeof(compat_long_t);
if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
#ifdef __BIG_ENDIAN
for (i = 0; i < len / sizeof(compat_long_t); i++)
if (copy_to_user((compat_long_t*) p + i,
(compat_long_t*) dev->key + i + 1 - ((i % 2) << 1),
sizeof(compat_long_t)))
return -EFAULT;
return len;
#else
return copy_to_user(p, dev->key, len) ? -EFAULT : len;
#endif
}

if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) {
int len;
len = NBITS_COMPAT(LED_MAX) * sizeof(compat_long_t);
if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
#ifdef __BIG_ENDIAN
for (i = 0; i < len / sizeof(compat_long_t); i++)
if (copy_to_user((compat_long_t*) p + i,
(compat_long_t*) dev->led + i + 1 - ((i % 2) << 1),
sizeof(compat_long_t)))
return -EFAULT;
return len;
#else
return copy_to_user(p, dev->led, len) ? -EFAULT : len;
#endif
}

if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) {
int len;
len = NBITS_COMPAT(SND_MAX) * sizeof(compat_long_t);
if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
#ifdef __BIG_ENDIAN
for (i = 0; i < len / sizeof(compat_long_t); i++)
if (copy_to_user((compat_long_t*) p + i,
(compat_long_t*) dev->snd + i + 1 - ((i % 2) << 1),
sizeof(compat_long_t)))
return -EFAULT;
return len;
#else
return copy_to_user(p, dev->snd, len) ? -EFAULT : len;
#endif
}

if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) {
int len;
if (!dev->name) return -ENOENT;
len = strlen(dev->name) + 1;
if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
return copy_to_user(p, dev->name, len) ? -EFAULT : len;
}

if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) {
int len;
if (!dev->phys) return -ENOENT;
len = strlen(dev->phys) + 1;
if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
return copy_to_user(p, dev->phys, len) ? -EFAULT : len;
}

if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) {
int len;
if (!dev->uniq) return -ENOENT;
len = strlen(dev->uniq) + 1;
if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
return copy_to_user(p, dev->uniq, len) ? -EFAULT : len;
}

if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {

int t = _IOC_NR(cmd) & ABS_MAX;

abs.value = dev->abs[t];
abs.minimum = dev->absmin[t];
abs.maximum = dev->absmax[t];
abs.fuzz = dev->absfuzz[t];
abs.flat = dev->absflat[t];

if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
return -EFAULT;

return 0;
}

if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {

int t = _IOC_NR(cmd) & ABS_MAX;

if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
return -EFAULT;

dev->abs[t] = abs.value;
dev->absmin[t] = abs.minimum;
dev->absmax[t] = abs.maximum;
dev->absfuzz[t] = abs.fuzz;
dev->absflat[t] = abs.flat;

return 0;
}
}
return -EINVAL;
}
#endif

static struct file_operations evdev_fops = {
.owner = THIS_MODULE,
.read = evdev_read,
.write = evdev_write,
.poll = evdev_poll,
.open = evdev_open,
.release = evdev_release,
.ioctl = evdev_ioctl,
.unlocked_ioctl = evdev_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = evdev_ioctl_compat,
#endif
.fasync = evdev_fasync,
.flush = evdev_flush
};
Expand Down

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