From 2d56f3a32c0e62f99c043d2579840f9731fe5855 Mon Sep 17 00:00:00 2001 From: Philip Langdale Date: Thu, 16 Oct 2008 22:31:42 -0400 Subject: Input: refactor evdev 32bit compat to be shareable with uinput Currently, evdev has working 32bit compatibility and uinput does not. uinput needs the input_event code that evdev uses, so let's refactor it so it can be shared. [dtor@mail.ru: add fix for force feedback compat issues] Signed-off-by: Philip Langdale Signed-off-by: Dmitry Torokhov --- drivers/input/misc/uinput.c | 172 +++++++++++++++++++++++++++++++++++++------- 1 file changed, 145 insertions(+), 27 deletions(-) (limited to 'drivers/input/misc') diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c index 223d56d5555b..46b7caeb2817 100644 --- a/drivers/input/misc/uinput.c +++ b/drivers/input/misc/uinput.c @@ -37,6 +37,7 @@ #include #include #include +#include "../input-compat.h" static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) { @@ -78,6 +79,7 @@ static struct uinput_request* uinput_request_find(struct uinput_device *udev, in /* Find an input request, by ID. Returns NULL if the ID isn't valid. */ if (id >= UINPUT_NUM_REQUESTS || id < 0) return NULL; + return udev->requests[id]; } @@ -127,6 +129,17 @@ static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *eff struct uinput_request request; int retval; + /* + * uinput driver does not currently support periodic effects with + * custom waveform since it does not have a way to pass buffer of + * samples (custom_data) to userspace. If ever there is a device + * supporting custom waveforms we would need to define an additional + * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out. + */ + if (effect->type == FF_PERIODIC && + effect->u.periodic.waveform == FF_CUSTOM) + return -EINVAL; + request.id = -1; init_completion(&request.done); request.code = UI_FF_UPLOAD; @@ -353,15 +366,15 @@ static inline ssize_t uinput_inject_event(struct uinput_device *udev, const char { struct input_event ev; - if (count != sizeof(struct input_event)) + if (count < input_event_size()) return -EINVAL; - if (copy_from_user(&ev, buffer, sizeof(struct input_event))) + if (input_event_from_user(buffer, &ev)) return -EFAULT; input_event(udev->dev, ev.type, ev.code, ev.value); - return sizeof(struct input_event); + return input_event_size(); } static ssize_t uinput_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) @@ -407,13 +420,13 @@ static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count, goto out; } - while (udev->head != udev->tail && retval + sizeof(struct input_event) <= count) { - if (copy_to_user(buffer + retval, &udev->buff[udev->tail], sizeof(struct input_event))) { + while (udev->head != udev->tail && retval + input_event_size() <= count) { + if (input_event_to_user(buffer + retval, &udev->buff[udev->tail])) { retval = -EFAULT; goto out; } udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE; - retval += sizeof(struct input_event); + retval += input_event_size(); } out: @@ -444,6 +457,93 @@ static int uinput_release(struct inode *inode, struct file *file) return 0; } +#ifdef CONFIG_COMPAT +struct uinput_ff_upload_compat { + int request_id; + int retval; + struct ff_effect_compat effect; + struct ff_effect_compat old; +}; + +static int uinput_ff_upload_to_user(char __user *buffer, + const struct uinput_ff_upload *ff_up) +{ + if (INPUT_COMPAT_TEST) { + struct uinput_ff_upload_compat ff_up_compat; + + ff_up_compat.request_id = ff_up->request_id; + ff_up_compat.retval = ff_up->retval; + /* + * It so happens that the pointer that gives us the trouble + * is the last field in the structure. Since we don't support + * custom waveforms in uinput anyway we can just copy the whole + * thing (to the compat size) and ignore the pointer. + */ + memcpy(&ff_up_compat.effect, &ff_up->effect, + sizeof(struct ff_effect_compat)); + memcpy(&ff_up_compat.old, &ff_up->old, + sizeof(struct ff_effect_compat)); + + if (copy_to_user(buffer, &ff_up_compat, + sizeof(struct uinput_ff_upload_compat))) + return -EFAULT; + } else { + if (copy_to_user(buffer, ff_up, + sizeof(struct uinput_ff_upload))) + return -EFAULT; + } + + return 0; +} + +static int uinput_ff_upload_from_user(const char __user *buffer, + struct uinput_ff_upload *ff_up) +{ + if (INPUT_COMPAT_TEST) { + struct uinput_ff_upload_compat ff_up_compat; + + if (copy_from_user(&ff_up_compat, buffer, + sizeof(struct uinput_ff_upload_compat))) + return -EFAULT; + + ff_up->request_id = ff_up_compat.request_id; + ff_up->retval = ff_up_compat.retval; + memcpy(&ff_up->effect, &ff_up_compat.effect, + sizeof(struct ff_effect_compat)); + memcpy(&ff_up->old, &ff_up_compat.old, + sizeof(struct ff_effect_compat)); + + } else { + if (copy_from_user(ff_up, buffer, + sizeof(struct uinput_ff_upload))) + return -EFAULT; + } + + return 0; +} + +#else + +static int uinput_ff_upload_to_user(char __user *buffer, + const struct uinput_ff_upload *ff_up) +{ + if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload))) + return -EFAULT; + + return 0; +} + +static int uinput_ff_upload_from_user(const char __user *buffer, + struct uinput_ff_upload *ff_up) +{ + if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload))) + return -EFAULT; + + return 0; +} + +#endif + #define uinput_set_bit(_arg, _bit, _max) \ ({ \ int __ret = 0; \ @@ -455,19 +555,17 @@ static int uinput_release(struct inode *inode, struct file *file) __ret; \ }) -static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +static long uinput_ioctl_handler(struct file *file, unsigned int cmd, + unsigned long arg, void __user *p) { int retval; - struct uinput_device *udev; - void __user *p = (void __user *)arg; + struct uinput_device *udev = file->private_data; struct uinput_ff_upload ff_up; struct uinput_ff_erase ff_erase; struct uinput_request *req; int length; char *phys; - udev = file->private_data; - retval = mutex_lock_interruptible(&udev->mutex); if (retval) return retval; @@ -549,26 +647,24 @@ static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg) break; case UI_BEGIN_FF_UPLOAD: - if (copy_from_user(&ff_up, p, sizeof(ff_up))) { - retval = -EFAULT; + retval = uinput_ff_upload_from_user(p, &ff_up); + if (retval) break; - } + req = uinput_request_find(udev, ff_up.request_id); - if (!(req && req->code == UI_FF_UPLOAD && req->u.upload.effect)) { + if (!req || req->code != UI_FF_UPLOAD || !req->u.upload.effect) { retval = -EINVAL; break; } + ff_up.retval = 0; - memcpy(&ff_up.effect, req->u.upload.effect, sizeof(struct ff_effect)); + ff_up.effect = *req->u.upload.effect; if (req->u.upload.old) - memcpy(&ff_up.old, req->u.upload.old, sizeof(struct ff_effect)); + ff_up.old = *req->u.upload.old; else memset(&ff_up.old, 0, sizeof(struct ff_effect)); - if (copy_to_user(p, &ff_up, sizeof(ff_up))) { - retval = -EFAULT; - break; - } + retval = uinput_ff_upload_to_user(p, &ff_up); break; case UI_BEGIN_FF_ERASE: @@ -576,29 +672,34 @@ static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg) retval = -EFAULT; break; } + req = uinput_request_find(udev, ff_erase.request_id); - if (!(req && req->code == UI_FF_ERASE)) { + if (!req || req->code != UI_FF_ERASE) { retval = -EINVAL; break; } + ff_erase.retval = 0; ff_erase.effect_id = req->u.effect_id; if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) { retval = -EFAULT; break; } + break; case UI_END_FF_UPLOAD: - if (copy_from_user(&ff_up, p, sizeof(ff_up))) { - retval = -EFAULT; + retval = uinput_ff_upload_from_user(p, &ff_up); + if (retval) break; - } + req = uinput_request_find(udev, ff_up.request_id); - if (!(req && req->code == UI_FF_UPLOAD && req->u.upload.effect)) { + if (!req || req->code != UI_FF_UPLOAD || + !req->u.upload.effect) { retval = -EINVAL; break; } + req->retval = ff_up.retval; uinput_request_done(udev, req); break; @@ -608,11 +709,13 @@ static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg) retval = -EFAULT; break; } + req = uinput_request_find(udev, ff_erase.request_id); - if (!(req && req->code == UI_FF_ERASE)) { + if (!req || req->code != UI_FF_ERASE) { retval = -EINVAL; break; } + req->retval = ff_erase.retval; uinput_request_done(udev, req); break; @@ -626,6 +729,18 @@ static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg) return retval; } +static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg); +} + +#ifdef CONFIG_COMPAT +static long uinput_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg)); +} +#endif + static const struct file_operations uinput_fops = { .owner = THIS_MODULE, .open = uinput_open, @@ -634,6 +749,9 @@ static const struct file_operations uinput_fops = { .write = uinput_write, .poll = uinput_poll, .unlocked_ioctl = uinput_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = uinput_compat_ioctl, +#endif }; static struct miscdevice uinput_misc = { -- cgit v1.2.3