path: root/arch/arm/Kconfig

config ARM
	bool
	default y
	select ARCH_BINFMT_ELF_RANDOMIZE_PIE
	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
	select ARCH_HAVE_CUSTOM_GPIO_H
	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
	select ARCH_WANT_IPC_PARSE_VERSION
	select BUILDTIME_EXTABLE_SORT if MMU
	select CPU_PM if (SUSPEND || CPU_IDLE)
	select DCACHE_WORD_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && !CPU_BIG_ENDIAN && MMU
	select GENERIC_ATOMIC64 if (CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI)
	select GENERIC_CLOCKEVENTS_BROADCAST if SMP
	select GENERIC_IRQ_PROBE
	select GENERIC_IRQ_SHOW
	select GENERIC_PCI_IOMAP
	select GENERIC_SCHED_CLOCK
	select GENERIC_SMP_IDLE_THREAD
	select GENERIC_IDLE_POLL_SETUP
	select GENERIC_STRNCPY_FROM_USER
	select GENERIC_STRNLEN_USER
	select HARDIRQS_SW_RESEND
	select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
	select HAVE_ARCH_KGDB
	select HAVE_ARCH_SECCOMP_FILTER
	select HAVE_ARCH_TRACEHOOK
	select HAVE_BPF_JIT
	select HAVE_C_RECORDMCOUNT
	select HAVE_DEBUG_KMEMLEAK
	select HAVE_DMA_API_DEBUG
	select HAVE_DMA_ATTRS
	select HAVE_DMA_CONTIGUOUS if MMU
	select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
	select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
	select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
	select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
	select HAVE_GENERIC_DMA_COHERENT
	select HAVE_GENERIC_HARDIRQS
	select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
	select HAVE_IDE if PCI || ISA || PCMCIA
	select HAVE_IRQ_TIME_ACCOUNTING
	select HAVE_KERNEL_GZIP
	select HAVE_KERNEL_LZ4
	select HAVE_KERNEL_LZMA
	select HAVE_KERNEL_LZO
	select HAVE_KERNEL_XZ
	select HAVE_KPROBES if !XIP_KERNEL
	select HAVE_KRETPROBES if (HAVE_KPROBES)
	select HAVE_MEMBLOCK
	select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
	select HAVE_PERF_EVENTS
	select HAVE_REGS_AND_STACK_ACCESS_API
	select HAVE_SYSCALL_TRACEPOINTS
	select HAVE_UID16
	select IRQ_FORCED_THREADING
	select KTIME_SCALAR
	select PERF_USE_VMALLOC
	select RTC_LIB
	select SYS_SUPPORTS_APM_EMULATION
	select HAVE_MOD_ARCH_SPECIFIC if ARM_UNWIND
	select MODULES_USE_ELF_REL
	select CLONE_BACKWARDS
	select OLD_SIGSUSPEND3
	select OLD_SIGACTION
	select HAVE_CONTEXT_TRACKING
	helps = 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;
	case EV_SW:  bits = dev->swbit;  len = SW_MAX;  break;
	default: return -EINVAL;
	}

	/*
	 * Work around bugs in userspace programs that like to do
	 * EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len'
	 * should be in bytes, not in bits.
	 */
	if ((_IOC_NR(cmd) & EV_MAX) == EV_KEY && _IOC_SIZE(cmd) == OLD_KEY_MAX) {
		len = OLD_KEY_MAX;
		if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000))
			printk(KERN_WARNING
				"evdev.c(EVIOCGBIT): Suspicious buffer size %u, "
				"limiting output to %zu bytes. See "
				"http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n",
				OLD_KEY_MAX,
				BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long));
	}

	return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode);
}
#undef OLD_KEY_MAX

static long evdev_do_ioctl(struct file *file, unsigned int cmd,
			   void __user *p, int compat_mode)
{
	struct evdev_client *client = file->private_data;
	struct evdev *evdev = client->evdev;
	struct input_dev *dev = evdev->handle.dev;
	struct input_absinfo abs;
	struct ff_effect effect;
	int __user *ip = (int __user *)p;
	int i, t, u, v;
	int error;

	switch (cmd) {

	case EVIOCGVERSION:
		return put_user(EV_VERSION, ip);

	case EVIOCGID:
		if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
			return -EFAULT;
		return 0;

	case EVIOCGREP:
		if (!test_bit(EV_REP, dev->evbit))
			return -ENOSYS;
		if (put_user(dev->rep[REP_DELAY], ip))
			return -EFAULT;
		if (put_user(dev->rep[REP_PERIOD], ip + 1))
			return -EFAULT;
		return 0;

	case EVIOCSREP:
		if (!test_bit(EV_REP, dev->evbit))
			return -ENOSYS;
		if (get_user(u, ip))
			return -EFAULT;
		if (get_user(v, ip + 1))
			return -EFAULT;

		input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
		input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);

		return 0;

	case EVIOCGKEYCODE:
		if (get_user(t, ip))
			return -EFAULT;

		error = input_get_keycode(dev, t, &v);
		if (error)
			return error;

		if (put_user(v, ip + 1))
			return -EFAULT;

		return 0;

	case EVIOCSKEYCODE:
		if (get_user(t, ip) || get_user(v, ip + 1))
			return -EFAULT;

		return input_set_keycode(dev, t, v);

	case EVIOCRMFF:
		return input_ff_erase(dev, (int)(unsigned long) p, file);

	case EVIOCGEFFECTS:
		i = test_bit(EV_FF, dev->evbit) ?
				dev->ff->max_effects : 0;
		if (put_user(i, ip))
			return -EFAULT;
		return 0;

	case EVIOCGRAB:
		if (p)
			return evdev_grab(evdev, client);
		else
			return evdev_ungrab(evdev, client);

	default:

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

		if (_IOC_DIR(cmd) == _IOC_READ) {

			if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0)))
				return handle_eviocgbit(dev, cmd, p, compat_mode);

			if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
				return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd),
						    p, compat_mode);

			if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
				return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd),
						    p, compat_mode);

			if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
				return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd),
						    p, compat_mode);

			if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0)))
				return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd),
						    p, compat_mode);

			if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
				return str_to_user(dev->name, _IOC_SIZE(cmd), p);

			if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
				return str_to_user(dev->phys, _IOC_SIZE(cmd), p);

			if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
				return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);

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

				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];
				abs.resolution = dev->absres[t];

				if (copy_to_user(p, &abs, min_t(size_t,
								_IOC_SIZE(cmd),
								sizeof(struct input_absinfo))))
					return -EFAULT;

				return 0;
			}

		}

		if (_IOC_DIR(cmd) == _IOC_WRITE) {

			if (_IOC_NR(cmd) == _IOC_NR(EVIOCSFF)) {

				if (input_ff_effect_from_user(p, _IOC_SIZE(cmd), &effect))
					return -EFAULT;

				error = input_ff_upload(dev, &effect, file);

				if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
					return -EFAULT;

				return error;
			}

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

				t = _IOC_NR(cmd) & ABS_MAX;

				if (copy_from_user(&abs, p, min_t(size_t,
								  _IOC_SIZE(cmd),
								  sizeof(struct input_absinfo))))
					return -EFAULT;

				/*
				 * Take event lock to ensure that we are not
				 * changing device parameters in the middle
				 * of event.
				 */
				spin_lock_irq(&dev->event_lock);

				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;
				dev->absres[t] = _IOC_SIZE(cmd) < sizeof(struct input_absinfo) ?
							0 : abs.resolution;

				spin_unlock_irq(&dev->event_lock);

				return 0;
			}
		}
	}
	return -EINVAL;
}

static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
				void __user *p, int compat_mode)
{
	struct evdev_client *client = file->private_data;
	struct evdev *evdev = client->evdev;
	int retval;

	retval = mutex_lock_interruptible(&evdev->mutex);
	if (retval)
		return retval;

	if (!evdev->exist) {
		retval = -ENODEV;
		goto out;
	}

	retval = evdev_do_ioctl(file, cmd, p, compat_mode);

 out:
	mutex_unlock(&evdev->mutex);
	return retval;
}

static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
}

#ifdef CONFIG_COMPAT
static long evdev_ioctl_compat(struct file *file,
				unsigned int cmd, unsigned long arg)
{
	return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
}
#endif

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

static int evdev_install_chrdev(struct evdev *evdev)
{
	/*
	 * No need to do any locking here as calls to connect and
	 * disconnect are serialized by the input core
	 */
	evdev_table[evdev->minor] = evdev;
	return 0;
}

static void evdev_remove_chrdev(struct evdev *evdev)
{
	/*
	 * Lock evdev table to prevent race with evdev_open()
	 */
	mutex_lock(&evdev_table_mutex);
	evdev_table[evdev->minor] = NULL;
	mutex_unlock(&evdev_table_mutex);
}

/*
 * Mark device non-existent. This disables writes, ioctls and
 * prevents new users from opening the device. Already posted
 * blocking reads will stay, however new ones will fail.
 */
static void evdev_mark_dead(struct evdev *evdev)
{
	mutex_lock(&evdev->mutex);
	evdev->exist = 0;
	mutex_unlock(&evdev->mutex);
}

static void evdev_cleanup(struct evdev *evdev)
{
	struct input_handle *handle = &evdev->handle;

	evdev_mark_dead(evdev);
	evdev_hangup(evdev);
	evdev_remove_chrdev(evdev);

	/* evdev is marked dead so no one else accesses evdev->open */
	if (evdev->open) {
		input_flush_device(handle, NULL);
		input_close_device(handle);
	}
}

/*
 * Create new evdev device. Note that input core serializes calls
 * to connect and disconnect so we don't need to lock evdev_table here.
 */
static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
			 const struct input_device_id *id)
{
	struct evdev *evdev;
	int minor;
	int error;

	for (minor = 0; minor < EVDEV_MINORS; minor++)
		if (!evdev_table[minor])
			break;

	if (minor == EVDEV_MINORS) {
		printk(KERN_ERR "evdev: no more free evdev devices\n");
		return -ENFILE;
	}

	evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL);
	if (!evdev)
		return -ENOMEM;

	INIT_LIST_HEAD(&evdev->client_list);
	spin_lock_init(&evdev->client_lock);
	mutex_init(&evdev->mutex);
	init_waitqueue_head(&evdev->wait);

	dev_set_name(&evdev->dev, "event%d", minor);
	evdev->exist = 1;
	evdev->minor = minor;

	evdev->handle.dev = input_get_device(dev);
	evdev->handle.name = dev_name(&evdev->dev);
	evdev->handle.handler = handler;
	evdev->handle.private = evdev;

	evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor);
	evdev->dev.class = &input_class;
	evdev->dev.parent = &dev->dev;
	evdev->dev.release = evdev_free;
	device_initialize(&evdev->dev);

	error = input_register_handle(&evdev->handle);
	if (error)
		goto err_free_evdev;

	error = evdev_install_chrdev(evdev);
	if (error)
		goto err_unregister_handle;

	error = device_add(&evdev->dev);
	if (error)
		goto err_cleanup_evdev;

	return 0;

 err_cleanup_evdev:
	evdev_cleanup(evdev);
 err_unregister_handle:
	input_unregister_handle(&evdev->handle);
 err_free_evdev:
	put_device(&evdev->dev);
	return error;
}

static void evdev_disconnect(struct input_handle *handle)
{
	struct evdev *evdev = handle->private;

	device_del(&evdev->dev);
	evdev_cleanup(evdev);
	input_unregister_handle(handle);
	put_device(&evdev->dev);
}

static const struct input_device_id evdev_ids[] = {
	{ .driver_info = 1 },	/* Matches all devices */
	{ },			/* Terminating zero entry */
};

MODULE_DEVICE_TABLE(input, evdev_ids);

static struct input_handler evdev_handler = {
	.event		= evdev_event,
	.connect	= evdev_connect,
	.disconnect	= evdev_disconnect,
	.fops		= &evdev_fops,
	.minor		= EVDEV_MINOR_BASE,
	.name		= "evdev",
	.id_table	= evdev_ids,
};

static int __init evdev_init(void)
{
	return input_register_handler(&evdev_handler);
}

static void __exit evdev_exit(void)
{
	input_unregister_handler(&evdev_handler);
}

module_init(evdev_init);
module_exit(evdev_exit);

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Input driver event char devices");
MODULE_LICENSE("GPL");