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-rw-r--r--drivers/input/misc/uinput.c89
-rw-r--r--include/uapi/linux/uinput.h29
2 files changed, 58 insertions, 60 deletions
diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c
index a16fc4a4bb1f..782df415e4d5 100644
--- a/drivers/input/misc/uinput.c
+++ b/drivers/input/misc/uinput.c
@@ -256,13 +256,22 @@ static void uinput_destroy_device(struct uinput_device *udev)
static int uinput_create_device(struct uinput_device *udev)
{
struct input_dev *dev = udev->dev;
- int error;
+ int error, nslot;
if (udev->state != UIST_SETUP_COMPLETE) {
printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
return -EINVAL;
}
+ if (test_bit(ABS_MT_SLOT, dev->absbit)) {
+ nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
+ error = input_mt_init_slots(dev, nslot, 0);
+ if (error)
+ goto fail1;
+ } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
+ input_set_events_per_packet(dev, 60);
+ }
+
if (udev->ff_effects_max) {
error = input_ff_create(dev, udev->ff_effects_max);
if (error)
@@ -308,10 +317,35 @@ static int uinput_open(struct inode *inode, struct file *file)
return 0;
}
+static int uinput_validate_absinfo(struct input_dev *dev, unsigned int code,
+ const struct input_absinfo *abs)
+{
+ int min, max;
+
+ min = abs->minimum;
+ max = abs->maximum;
+
+ if ((min != 0 || max != 0) && max <= min) {
+ printk(KERN_DEBUG
+ "%s: invalid abs[%02x] min:%d max:%d\n",
+ UINPUT_NAME, code, min, max);
+ return -EINVAL;
+ }
+
+ if (abs->flat > max - min) {
+ printk(KERN_DEBUG
+ "%s: abs_flat #%02x out of range: %d (min:%d/max:%d)\n",
+ UINPUT_NAME, code, abs->flat, min, max);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static int uinput_validate_absbits(struct input_dev *dev)
{
unsigned int cnt;
- int nslot;
+ int error;
if (!test_bit(EV_ABS, dev->evbit))
return 0;
@@ -321,38 +355,12 @@ static int uinput_validate_absbits(struct input_dev *dev)
*/
for_each_set_bit(cnt, dev->absbit, ABS_CNT) {
- int min, max;
-
- min = input_abs_get_min(dev, cnt);
- max = input_abs_get_max(dev, cnt);
-
- if ((min != 0 || max != 0) && max <= min) {
- printk(KERN_DEBUG
- "%s: invalid abs[%02x] min:%d max:%d\n",
- UINPUT_NAME, cnt,
- input_abs_get_min(dev, cnt),
- input_abs_get_max(dev, cnt));
+ if (!dev->absinfo)
return -EINVAL;
- }
-
- if (input_abs_get_flat(dev, cnt) >
- input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) {
- printk(KERN_DEBUG
- "%s: abs_flat #%02x out of range: %d "
- "(min:%d/max:%d)\n",
- UINPUT_NAME, cnt,
- input_abs_get_flat(dev, cnt),
- input_abs_get_min(dev, cnt),
- input_abs_get_max(dev, cnt));
- return -EINVAL;
- }
- }
- if (test_bit(ABS_MT_SLOT, dev->absbit)) {
- nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
- input_mt_init_slots(dev, nslot, 0);
- } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
- input_set_events_per_packet(dev, 60);
+ error = uinput_validate_absinfo(dev, cnt, &dev->absinfo[cnt]);
+ if (error)
+ return error;
}
return 0;
@@ -375,7 +383,6 @@ static int uinput_dev_setup(struct uinput_device *udev,
{
struct uinput_setup setup;
struct input_dev *dev;
- int retval;
if (udev->state == UIST_CREATED)
return -EINVAL;
@@ -395,10 +402,6 @@ static int uinput_dev_setup(struct uinput_device *udev,
if (!dev->name)
return -ENOMEM;
- retval = uinput_validate_absbits(dev);
- if (retval < 0)
- return retval;
-
udev->state = UIST_SETUP_COMPLETE;
return 0;
}
@@ -408,6 +411,7 @@ static int uinput_abs_setup(struct uinput_device *udev,
{
struct uinput_abs_setup setup = {};
struct input_dev *dev;
+ int error;
if (size > sizeof(setup))
return -E2BIG;
@@ -423,19 +427,16 @@ static int uinput_abs_setup(struct uinput_device *udev,
dev = udev->dev;
+ error = uinput_validate_absinfo(dev, setup.code, &setup.absinfo);
+ if (error)
+ return error;
+
input_alloc_absinfo(dev);
if (!dev->absinfo)
return -ENOMEM;
set_bit(setup.code, dev->absbit);
dev->absinfo[setup.code] = setup.absinfo;
-
- /*
- * We restore the state to UIST_NEW_DEVICE because the user has to call
- * UI_DEV_SETUP in the last place before UI_DEV_CREATE to check the
- * validity of the absbits.
- */
- udev->state = UIST_NEW_DEVICE;
return 0;
}
diff --git a/include/uapi/linux/uinput.h b/include/uapi/linux/uinput.h
index 77b8cf73a178..dc652e224b67 100644
--- a/include/uapi/linux/uinput.h
+++ b/include/uapi/linux/uinput.h
@@ -72,13 +72,12 @@ struct uinput_setup {
/**
* UI_DEV_SETUP - Set device parameters for setup
*
- * This ioctl sets parameters for the input device to be created. It must be
- * issued *before* calling UI_DEV_CREATE or it will fail. This ioctl supersedes
- * the old "struct uinput_user_dev" method, which wrote this data via write().
- * To actually set the absolute axes, you also need to call the ioctl
- * UI_ABS_SETUP *before* calling this ioctl.
+ * This ioctl sets parameters for the input device to be created. It
+ * supersedes the old "struct uinput_user_dev" method, which wrote this data
+ * via write(). To actually set the absolute axes UI_ABS_SETUP should be
+ * used.
*
- * This ioctl takes a "struct uinput_setup" object as argument. The fields of
+ * The ioctl takes a "struct uinput_setup" object as argument. The fields of
* this object are as follows:
* id: See the description of "struct input_id". This field is
* copied unchanged into the new device.
@@ -87,9 +86,9 @@ struct uinput_setup {
* See below for a description of FF with uinput.
*
* This ioctl can be called multiple times and will overwrite previous values.
- * If this ioctl fails with -EINVAL, you're recommended to use the old
- * "uinput_user_dev" method via write() as fallback, in case you run on an old
- * kernel that does not support this ioctl.
+ * If this ioctl fails with -EINVAL, it is recommended to use the old
+ * "uinput_user_dev" method via write() as a fallback, in case you run on an
+ * old kernel that does not support this ioctl.
*
* This ioctl may fail with -EINVAL if it is not supported or if you passed
* incorrect values, -ENOMEM if the kernel runs out of memory or -EFAULT if the
@@ -109,12 +108,10 @@ struct uinput_abs_setup {
* UI_ABS_SETUP - Set absolute axis information for the device to setup
*
* This ioctl sets one absolute axis information for the input device to be
- * created. It must be issued *before* calling UI_DEV_SETUP and UI_DEV_CREATE
- * for every absolute axis the device exports.
- * This ioctl supersedes the old "struct uinput_user_dev" method, which wrote
+ * created. It supersedes the old "struct uinput_user_dev" method, which wrote
* part of this data and the content of UI_DEV_SETUP via write().
*
- * This ioctl takes a "struct uinput_abs_setup" object as argument. The fields
+ * The ioctl takes a "struct uinput_abs_setup" object as argument. The fields
* of this object are as follows:
* code: The corresponding input code associated with this axis
* (ABS_X, ABS_Y, etc...)
@@ -124,9 +121,9 @@ struct uinput_abs_setup {
* UI_SET_ABSBIT, this ioctl will enable it.
*
* This ioctl can be called multiple times and will overwrite previous values.
- * If this ioctl fails with -EINVAL, you're recommended to use the old
- * "uinput_user_dev" method via write() as fallback, in case you run on an old
- * kernel that does not support this ioctl.
+ * If this ioctl fails with -EINVAL, it is recommended to use the old
+ * "uinput_user_dev" method via write() as a fallback, in case you run on an
+ * old kernel that does not support this ioctl.
*
* This ioctl may fail with -EINVAL if it is not supported or if you passed
* incorrect values, -ENOMEM if the kernel runs out of memory or -EFAULT if the
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 03:35:48 +0000