Commit 52658bb6 authored by Juergen Kreileder's avatar Juergen Kreileder Committed by Dmitry Torokhov
Browse files

Input: Add support for 32-bit emulation on 64-bit platforms for evdev. 



Signed-off-by: default avatarJuergen Kreileder <jk@blackdown.de>
Signed-off-by: default avatarVojtech Pavlik <vojtech@suse.cz>
Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
parent 024ac44c

drivers/input/evdev.c

+266 −2
Original line number Diff line number Diff line
@@ -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;
@@ -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;
@@ -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)))
@@ -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;
@@ -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;
@@ -389,6 +475,181 @@ 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,
@@ -396,7 +657,10 @@ static struct file_operations evdev_fops = { 
	.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

};