From 52658bb685df77f71e97f1b503dee97d27a88b0f Mon Sep 17 00:00:00 2001 From: Juergen Kreileder Date: Sun, 29 May 2005 02:26:43 -0500 Subject: [PATCH] Input: Add support for 32-bit emulation on 64-bit platforms for evdev. Signed-off-by: Juergen Kreileder Signed-off-by: Vojtech Pavlik Signed-off-by: Dmitry Torokhov --- drivers/input/evdev.c | 268 +++++++++++++++++++++++++++++++++++++++++- 1 file changed, 266 insertions(+), 2 deletions(-) diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c index 17552a2997..a04a8314dc 100644 --- a/drivers/input/evdev.c +++ b/drivers/input/evdev.c @@ -21,6 +21,7 @@ #include #include #include +#include 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(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 }; -- 2.39.5