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path: root/drivers/input/input.c
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Diffstat (limited to 'drivers/input/input.c')
-rw-r--r--drivers/input/input.c182
1 files changed, 125 insertions, 57 deletions
diff --git a/drivers/input/input.c b/drivers/input/input.c
index 9c79bd56b51a..e1243b4b32a5 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -33,25 +33,6 @@ MODULE_LICENSE("GPL");
#define INPUT_DEVICES 256
-/*
- * EV_ABS events which should not be cached are listed here.
- */
-static unsigned int input_abs_bypass_init_data[] __initdata = {
- ABS_MT_TOUCH_MAJOR,
- ABS_MT_TOUCH_MINOR,
- ABS_MT_WIDTH_MAJOR,
- ABS_MT_WIDTH_MINOR,
- ABS_MT_ORIENTATION,
- ABS_MT_POSITION_X,
- ABS_MT_POSITION_Y,
- ABS_MT_TOOL_TYPE,
- ABS_MT_BLOB_ID,
- ABS_MT_TRACKING_ID,
- ABS_MT_PRESSURE,
- 0
-};
-static unsigned long input_abs_bypass[BITS_TO_LONGS(ABS_CNT)];
-
static LIST_HEAD(input_dev_list);
static LIST_HEAD(input_handler_list);
@@ -181,6 +162,56 @@ static void input_stop_autorepeat(struct input_dev *dev)
#define INPUT_PASS_TO_DEVICE 2
#define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
+static int input_handle_abs_event(struct input_dev *dev,
+ unsigned int code, int *pval)
+{
+ bool is_mt_event;
+ int *pold;
+
+ if (code == ABS_MT_SLOT) {
+ /*
+ * "Stage" the event; we'll flush it later, when we
+ * get actiual touch data.
+ */
+ if (*pval >= 0 && *pval < dev->mtsize)
+ dev->slot = *pval;
+
+ return INPUT_IGNORE_EVENT;
+ }
+
+ is_mt_event = code >= ABS_MT_FIRST && code <= ABS_MT_LAST;
+
+ if (!is_mt_event) {
+ pold = &dev->abs[code];
+ } else if (dev->mt) {
+ struct input_mt_slot *mtslot = &dev->mt[dev->slot];
+ pold = &mtslot->abs[code - ABS_MT_FIRST];
+ } else {
+ /*
+ * Bypass filtering for multitouch events when
+ * not employing slots.
+ */
+ pold = NULL;
+ }
+
+ if (pold) {
+ *pval = input_defuzz_abs_event(*pval, *pold,
+ dev->absfuzz[code]);
+ if (*pold == *pval)
+ return INPUT_IGNORE_EVENT;
+
+ *pold = *pval;
+ }
+
+ /* Flush pending "slot" event */
+ if (is_mt_event && dev->slot != dev->abs[ABS_MT_SLOT]) {
+ dev->abs[ABS_MT_SLOT] = dev->slot;
+ input_pass_event(dev, EV_ABS, ABS_MT_SLOT, dev->slot);
+ }
+
+ return INPUT_PASS_TO_HANDLERS;
+}
+
static void input_handle_event(struct input_dev *dev,
unsigned int type, unsigned int code, int value)
{
@@ -196,12 +227,12 @@ static void input_handle_event(struct input_dev *dev,
case SYN_REPORT:
if (!dev->sync) {
- dev->sync = 1;
+ dev->sync = true;
disposition = INPUT_PASS_TO_HANDLERS;
}
break;
case SYN_MT_REPORT:
- dev->sync = 0;
+ dev->sync = false;
disposition = INPUT_PASS_TO_HANDLERS;
break;
}
@@ -233,21 +264,9 @@ static void input_handle_event(struct input_dev *dev,
break;
case EV_ABS:
- if (is_event_supported(code, dev->absbit, ABS_MAX)) {
-
- if (test_bit(code, input_abs_bypass)) {
- disposition = INPUT_PASS_TO_HANDLERS;
- break;
- }
+ if (is_event_supported(code, dev->absbit, ABS_MAX))
+ disposition = input_handle_abs_event(dev, code, &value);
- value = input_defuzz_abs_event(value,
- dev->abs[code], dev->absfuzz[code]);
-
- if (dev->abs[code] != value) {
- dev->abs[code] = value;
- disposition = INPUT_PASS_TO_HANDLERS;
- }
- }
break;
case EV_REL:
@@ -298,7 +317,7 @@ static void input_handle_event(struct input_dev *dev,
}
if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN)
- dev->sync = 0;
+ dev->sync = false;
if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
dev->event(dev, type, code, value);
@@ -528,12 +547,30 @@ void input_close_device(struct input_handle *handle)
EXPORT_SYMBOL(input_close_device);
/*
+ * Simulate keyup events for all keys that are marked as pressed.
+ * The function must be called with dev->event_lock held.
+ */
+static void input_dev_release_keys(struct input_dev *dev)
+{
+ int code;
+
+ if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
+ for (code = 0; code <= KEY_MAX; code++) {
+ if (is_event_supported(code, dev->keybit, KEY_MAX) &&
+ __test_and_clear_bit(code, dev->key)) {
+ input_pass_event(dev, EV_KEY, code, 0);
+ }
+ }
+ input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
+ }
+}
+
+/*
* Prepare device for unregistering
*/
static void input_disconnect_device(struct input_dev *dev)
{
struct input_handle *handle;
- int code;
/*
* Mark device as going away. Note that we take dev->mutex here
@@ -552,15 +589,7 @@ static void input_disconnect_device(struct input_dev *dev)
* generate events even after we done here but they will not
* reach any handlers.
*/
- if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
- for (code = 0; code <= KEY_MAX; code++) {
- if (is_event_supported(code, dev->keybit, KEY_MAX) &&
- __test_and_clear_bit(code, dev->key)) {
- input_pass_event(dev, EV_KEY, code, 0);
- }
- }
- input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
- }
+ input_dev_release_keys(dev);
list_for_each_entry(handle, &dev->h_list, d_node)
handle->open = 0;
@@ -684,7 +713,7 @@ int input_set_keycode(struct input_dev *dev,
unsigned int scancode, unsigned int keycode)
{
unsigned long flags;
- int old_keycode;
+ unsigned int old_keycode;
int retval;
if (keycode > KEY_MAX)
@@ -1278,6 +1307,7 @@ static void input_dev_release(struct device *device)
struct input_dev *dev = to_input_dev(device);
input_ff_destroy(dev);
+ input_mt_destroy_slots(dev);
kfree(dev);
module_put(THIS_MODULE);
@@ -1433,6 +1463,15 @@ static int input_dev_resume(struct device *dev)
mutex_lock(&input_dev->mutex);
input_dev_reset(input_dev, true);
+
+ /*
+ * Keys that have been pressed at suspend time are unlikely
+ * to be still pressed when we resume.
+ */
+ spin_lock_irq(&input_dev->event_lock);
+ input_dev_release_keys(input_dev);
+ spin_unlock_irq(&input_dev->event_lock);
+
mutex_unlock(&input_dev->mutex);
return 0;
@@ -1518,6 +1557,45 @@ void input_free_device(struct input_dev *dev)
EXPORT_SYMBOL(input_free_device);
/**
+ * input_mt_create_slots() - create MT input slots
+ * @dev: input device supporting MT events and finger tracking
+ * @num_slots: number of slots used by the device
+ *
+ * This function allocates all necessary memory for MT slot handling
+ * in the input device, and adds ABS_MT_SLOT to the device capabilities.
+ */
+int input_mt_create_slots(struct input_dev *dev, unsigned int num_slots)
+{
+ if (!num_slots)
+ return 0;
+
+ dev->mt = kcalloc(num_slots, sizeof(struct input_mt_slot), GFP_KERNEL);
+ if (!dev->mt)
+ return -ENOMEM;
+
+ dev->mtsize = num_slots;
+ input_set_abs_params(dev, ABS_MT_SLOT, 0, num_slots - 1, 0, 0);
+
+ return 0;
+}
+EXPORT_SYMBOL(input_mt_create_slots);
+
+/**
+ * input_mt_destroy_slots() - frees the MT slots of the input device
+ * @dev: input device with allocated MT slots
+ *
+ * This function is only needed in error path as the input core will
+ * automatically free the MT slots when the device is destroyed.
+ */
+void input_mt_destroy_slots(struct input_dev *dev)
+{
+ kfree(dev->mt);
+ dev->mt = NULL;
+ dev->mtsize = 0;
+}
+EXPORT_SYMBOL(input_mt_destroy_slots);
+
+/**
* input_set_capability - mark device as capable of a certain event
* @dev: device that is capable of emitting or accepting event
* @type: type of the event (EV_KEY, EV_REL, etc...)
@@ -1926,20 +2004,10 @@ static const struct file_operations input_fops = {
.open = input_open_file,
};
-static void __init input_init_abs_bypass(void)
-{
- const unsigned int *p;
-
- for (p = input_abs_bypass_init_data; *p; p++)
- input_abs_bypass[BIT_WORD(*p)] |= BIT_MASK(*p);
-}
-
static int __init input_init(void)
{
int err;
- input_init_abs_bypass();
-
err = class_register(&input_class);
if (err) {
printk(KERN_ERR "input: unable to register input_dev class\n");
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-20 04:04:41 +0000