*/
#include <linux/init.h>
-#include <linux/sched.h>
-#include <linux/smp_lock.h>
+#include <linux/types.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/random.h>
#include <linux/major.h>
#include <linux/proc_fs.h>
+#include <linux/sched.h>
#include <linux/seq_file.h>
-#include <linux/interrupt.h>
#include <linux/poll.h>
#include <linux/device.h>
#include <linux/mutex.h>
+#include <linux/rcupdate.h>
+#include <linux/smp_lock.h>
MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
MODULE_DESCRIPTION("Input core");
#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,
+ 0
+};
+static unsigned long input_abs_bypass[BITS_TO_LONGS(ABS_CNT)];
+
static LIST_HEAD(input_dev_list);
static LIST_HEAD(input_handler_list);
+/*
+ * input_mutex protects access to both input_dev_list and input_handler_list.
+ * This also causes input_[un]register_device and input_[un]register_handler
+ * be mutually exclusive which simplifies locking in drivers implementing
+ * input handlers.
+ */
+static DEFINE_MUTEX(input_mutex);
+
static struct input_handler *input_table[8];
-/**
- * input_event() - report new input event
- * @handle: device that generated the event
- * @type: type of the event
- * @code: event code
- * @value: value of the event
- *
- * This function should be used by drivers implementing various input devices
- * See also input_inject_event()
- */
-void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
+static inline int is_event_supported(unsigned int code,
+ unsigned long *bm, unsigned int max)
{
- struct input_handle *handle;
+ return code <= max && test_bit(code, bm);
+}
- if (type > EV_MAX || !test_bit(type, dev->evbit))
- return;
+static int input_defuzz_abs_event(int value, int old_val, int fuzz)
+{
+ if (fuzz) {
+ if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
+ return old_val;
- add_input_randomness(type, code, value);
+ if (value > old_val - fuzz && value < old_val + fuzz)
+ return (old_val * 3 + value) / 4;
- switch (type) {
+ if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
+ return (old_val + value) / 2;
+ }
- case EV_SYN:
- switch (code) {
- case SYN_CONFIG:
- if (dev->event)
- dev->event(dev, type, code, value);
- break;
-
- case SYN_REPORT:
- if (dev->sync)
- return;
- dev->sync = 1;
- break;
- }
- break;
+ return value;
+}
- case EV_KEY:
+/*
+ * Pass event through all open handles. This function is called with
+ * dev->event_lock held and interrupts disabled.
+ */
+static void input_pass_event(struct input_dev *dev,
+ unsigned int type, unsigned int code, int value)
+{
+ struct input_handle *handle;
- if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value)
- return;
+ rcu_read_lock();
- if (value == 2)
- break;
+ handle = rcu_dereference(dev->grab);
+ if (handle)
+ handle->handler->event(handle, type, code, value);
+ else
+ list_for_each_entry_rcu(handle, &dev->h_list, d_node)
+ if (handle->open)
+ handle->handler->event(handle,
+ type, code, value);
+ rcu_read_unlock();
+}
- change_bit(code, dev->key);
+/*
+ * Generate software autorepeat event. Note that we take
+ * dev->event_lock here to avoid racing with input_event
+ * which may cause keys get "stuck".
+ */
+static void input_repeat_key(unsigned long data)
+{
+ struct input_dev *dev = (void *) data;
+ unsigned long flags;
- if (test_bit(EV_REP, dev->evbit) && dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] && dev->timer.data && value) {
- dev->repeat_key = code;
- mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
- }
+ spin_lock_irqsave(&dev->event_lock, flags);
- break;
+ if (test_bit(dev->repeat_key, dev->key) &&
+ is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
- case EV_SW:
+ input_pass_event(dev, EV_KEY, dev->repeat_key, 2);
- if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value)
- return;
+ if (dev->sync) {
+ /*
+ * Only send SYN_REPORT if we are not in a middle
+ * of driver parsing a new hardware packet.
+ * Otherwise assume that the driver will send
+ * SYN_REPORT once it's done.
+ */
+ input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
+ }
- change_bit(code, dev->sw);
+ if (dev->rep[REP_PERIOD])
+ mod_timer(&dev->timer, jiffies +
+ msecs_to_jiffies(dev->rep[REP_PERIOD]));
+ }
- break;
+ spin_unlock_irqrestore(&dev->event_lock, flags);
+}
- case EV_ABS:
+static void input_start_autorepeat(struct input_dev *dev, int code)
+{
+ if (test_bit(EV_REP, dev->evbit) &&
+ dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
+ dev->timer.data) {
+ dev->repeat_key = code;
+ mod_timer(&dev->timer,
+ jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
+ }
+}
- if (code > ABS_MAX || !test_bit(code, dev->absbit))
- return;
+static void input_stop_autorepeat(struct input_dev *dev)
+{
+ del_timer(&dev->timer);
+}
- if (dev->absfuzz[code]) {
- if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&
- (value < dev->abs[code] + (dev->absfuzz[code] >> 1)))
- return;
+#define INPUT_IGNORE_EVENT 0
+#define INPUT_PASS_TO_HANDLERS 1
+#define INPUT_PASS_TO_DEVICE 2
+#define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
- if ((value > dev->abs[code] - dev->absfuzz[code]) &&
- (value < dev->abs[code] + dev->absfuzz[code]))
- value = (dev->abs[code] * 3 + value) >> 2;
+static void input_handle_event(struct input_dev *dev,
+ unsigned int type, unsigned int code, int value)
+{
+ int disposition = INPUT_IGNORE_EVENT;
- if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&
- (value < dev->abs[code] + (dev->absfuzz[code] << 1)))
- value = (dev->abs[code] + value) >> 1;
- }
+ switch (type) {
- if (dev->abs[code] == value)
- return;
+ case EV_SYN:
+ switch (code) {
+ case SYN_CONFIG:
+ disposition = INPUT_PASS_TO_ALL;
+ break;
- dev->abs[code] = value;
+ case SYN_REPORT:
+ if (!dev->sync) {
+ dev->sync = 1;
+ disposition = INPUT_PASS_TO_HANDLERS;
+ }
break;
+ case SYN_MT_REPORT:
+ dev->sync = 0;
+ disposition = INPUT_PASS_TO_HANDLERS;
+ break;
+ }
+ break;
+
+ case EV_KEY:
+ if (is_event_supported(code, dev->keybit, KEY_MAX) &&
+ !!test_bit(code, dev->key) != value) {
+
+ if (value != 2) {
+ __change_bit(code, dev->key);
+ if (value)
+ input_start_autorepeat(dev, code);
+ else
+ input_stop_autorepeat(dev);
+ }
- case EV_REL:
+ disposition = INPUT_PASS_TO_HANDLERS;
+ }
+ break;
- if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0))
- return;
+ case EV_SW:
+ if (is_event_supported(code, dev->swbit, SW_MAX) &&
+ !!test_bit(code, dev->sw) != value) {
- break;
+ __change_bit(code, dev->sw);
+ disposition = INPUT_PASS_TO_HANDLERS;
+ }
+ break;
- case EV_MSC:
+ case EV_ABS:
+ if (is_event_supported(code, dev->absbit, ABS_MAX)) {
- if (code > MSC_MAX || !test_bit(code, dev->mscbit))
- return;
+ if (test_bit(code, input_abs_bypass)) {
+ disposition = INPUT_PASS_TO_HANDLERS;
+ break;
+ }
- if (dev->event)
- dev->event(dev, type, code, value);
+ value = input_defuzz_abs_event(value,
+ dev->abs[code], dev->absfuzz[code]);
- break;
+ if (dev->abs[code] != value) {
+ dev->abs[code] = value;
+ disposition = INPUT_PASS_TO_HANDLERS;
+ }
+ }
+ break;
- case EV_LED:
+ case EV_REL:
+ if (is_event_supported(code, dev->relbit, REL_MAX) && value)
+ disposition = INPUT_PASS_TO_HANDLERS;
- if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)
- return;
+ break;
- change_bit(code, dev->led);
+ case EV_MSC:
+ if (is_event_supported(code, dev->mscbit, MSC_MAX))
+ disposition = INPUT_PASS_TO_ALL;
- if (dev->event)
- dev->event(dev, type, code, value);
+ break;
- break;
+ case EV_LED:
+ if (is_event_supported(code, dev->ledbit, LED_MAX) &&
+ !!test_bit(code, dev->led) != value) {
- case EV_SND:
+ __change_bit(code, dev->led);
+ disposition = INPUT_PASS_TO_ALL;
+ }
+ break;
- if (code > SND_MAX || !test_bit(code, dev->sndbit))
- return;
+ case EV_SND:
+ if (is_event_supported(code, dev->sndbit, SND_MAX)) {
if (!!test_bit(code, dev->snd) != !!value)
- change_bit(code, dev->snd);
-
- if (dev->event)
- dev->event(dev, type, code, value);
+ __change_bit(code, dev->snd);
+ disposition = INPUT_PASS_TO_ALL;
+ }
+ break;
- break;
+ case EV_REP:
+ if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
+ dev->rep[code] = value;
+ disposition = INPUT_PASS_TO_ALL;
+ }
+ break;
+
+ case EV_FF:
+ if (value >= 0)
+ disposition = INPUT_PASS_TO_ALL;
+ break;
+
+ case EV_PWR:
+ disposition = INPUT_PASS_TO_ALL;
+ break;
+ }
- case EV_REP:
+ if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN)
+ dev->sync = 0;
- if (code > REP_MAX || value < 0 || dev->rep[code] == value)
- return;
+ if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
+ dev->event(dev, type, code, value);
- dev->rep[code] = value;
- if (dev->event)
- dev->event(dev, type, code, value);
+ if (disposition & INPUT_PASS_TO_HANDLERS)
+ input_pass_event(dev, type, code, value);
+}
- break;
+/**
+ * input_event() - report new input event
+ * @dev: device that generated the event
+ * @type: type of the event
+ * @code: event code
+ * @value: value of the event
+ *
+ * This function should be used by drivers implementing various input
+ * devices. See also input_inject_event().
+ */
- case EV_FF:
+void input_event(struct input_dev *dev,
+ unsigned int type, unsigned int code, int value)
+{
+ unsigned long flags;
- if (value < 0)
- return;
+ if (is_event_supported(type, dev->evbit, EV_MAX)) {
- if (dev->event)
- dev->event(dev, type, code, value);
- break;
+ spin_lock_irqsave(&dev->event_lock, flags);
+ add_input_randomness(type, code, value);
+ input_handle_event(dev, type, code, value);
+ spin_unlock_irqrestore(&dev->event_lock, flags);
}
-
- if (type != EV_SYN)
- dev->sync = 0;
-
- if (dev->grab)
- dev->grab->handler->event(dev->grab, type, code, value);
- else
- list_for_each_entry(handle, &dev->h_list, d_node)
- if (handle->open)
- handle->handler->event(handle, type, code, value);
}
EXPORT_SYMBOL(input_event);
* @code: event code
* @value: value of the event
*
- * Similar to input_event() but will ignore event if device is "grabbed" and handle
- * injecting event is not the one that owns the device.
+ * Similar to input_event() but will ignore event if device is
+ * "grabbed" and handle injecting event is not the one that owns
+ * the device.
*/
-void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
-{
- if (!handle->dev->grab || handle->dev->grab == handle)
- input_event(handle->dev, type, code, value);
-}
-EXPORT_SYMBOL(input_inject_event);
-
-static void input_repeat_key(unsigned long data)
+void input_inject_event(struct input_handle *handle,
+ unsigned int type, unsigned int code, int value)
{
- struct input_dev *dev = (void *) data;
+ struct input_dev *dev = handle->dev;
+ struct input_handle *grab;
+ unsigned long flags;
- if (!test_bit(dev->repeat_key, dev->key))
- return;
+ if (is_event_supported(type, dev->evbit, EV_MAX)) {
+ spin_lock_irqsave(&dev->event_lock, flags);
- input_event(dev, EV_KEY, dev->repeat_key, 2);
- input_sync(dev);
+ rcu_read_lock();
+ grab = rcu_dereference(dev->grab);
+ if (!grab || grab == handle)
+ input_handle_event(dev, type, code, value);
+ rcu_read_unlock();
- if (dev->rep[REP_PERIOD])
- mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD]));
+ spin_unlock_irqrestore(&dev->event_lock, flags);
+ }
}
+EXPORT_SYMBOL(input_inject_event);
+/**
+ * input_grab_device - grabs device for exclusive use
+ * @handle: input handle that wants to own the device
+ *
+ * When a device is grabbed by an input handle all events generated by
+ * the device are delivered only to this handle. Also events injected
+ * by other input handles are ignored while device is grabbed.
+ */
int input_grab_device(struct input_handle *handle)
{
- if (handle->dev->grab)
- return -EBUSY;
+ struct input_dev *dev = handle->dev;
+ int retval;
- handle->dev->grab = handle;
- return 0;
+ retval = mutex_lock_interruptible(&dev->mutex);
+ if (retval)
+ return retval;
+
+ if (dev->grab) {
+ retval = -EBUSY;
+ goto out;
+ }
+
+ rcu_assign_pointer(dev->grab, handle);
+ synchronize_rcu();
+
+ out:
+ mutex_unlock(&dev->mutex);
+ return retval;
}
EXPORT_SYMBOL(input_grab_device);
-void input_release_device(struct input_handle *handle)
+static void __input_release_device(struct input_handle *handle)
{
struct input_dev *dev = handle->dev;
if (dev->grab == handle) {
- dev->grab = NULL;
+ rcu_assign_pointer(dev->grab, NULL);
+ /* Make sure input_pass_event() notices that grab is gone */
+ synchronize_rcu();
list_for_each_entry(handle, &dev->h_list, d_node)
- if (handle->handler->start)
+ if (handle->open && handle->handler->start)
handle->handler->start(handle);
}
}
+
+/**
+ * input_release_device - release previously grabbed device
+ * @handle: input handle that owns the device
+ *
+ * Releases previously grabbed device so that other input handles can
+ * start receiving input events. Upon release all handlers attached
+ * to the device have their start() method called so they have a change
+ * to synchronize device state with the rest of the system.
+ */
+void input_release_device(struct input_handle *handle)
+{
+ struct input_dev *dev = handle->dev;
+
+ mutex_lock(&dev->mutex);
+ __input_release_device(handle);
+ mutex_unlock(&dev->mutex);
+}
EXPORT_SYMBOL(input_release_device);
+/**
+ * input_open_device - open input device
+ * @handle: handle through which device is being accessed
+ *
+ * This function should be called by input handlers when they
+ * want to start receive events from given input device.
+ */
int input_open_device(struct input_handle *handle)
{
struct input_dev *dev = handle->dev;
- int err;
+ int retval;
- err = mutex_lock_interruptible(&dev->mutex);
- if (err)
- return err;
+ retval = mutex_lock_interruptible(&dev->mutex);
+ if (retval)
+ return retval;
+
+ if (dev->going_away) {
+ retval = -ENODEV;
+ goto out;
+ }
handle->open++;
if (!dev->users++ && dev->open)
- err = dev->open(dev);
-
- if (err)
- handle->open--;
+ retval = dev->open(dev);
+
+ if (retval) {
+ dev->users--;
+ if (!--handle->open) {
+ /*
+ * Make sure we are not delivering any more events
+ * through this handle
+ */
+ synchronize_rcu();
+ }
+ }
+ out:
mutex_unlock(&dev->mutex);
-
- return err;
+ return retval;
}
EXPORT_SYMBOL(input_open_device);
-int input_flush_device(struct input_handle* handle, struct file* file)
+int input_flush_device(struct input_handle *handle, struct file *file)
{
- if (handle->dev->flush)
- return handle->dev->flush(handle->dev, file);
+ struct input_dev *dev = handle->dev;
+ int retval;
- return 0;
+ retval = mutex_lock_interruptible(&dev->mutex);
+ if (retval)
+ return retval;
+
+ if (dev->flush)
+ retval = dev->flush(dev, file);
+
+ mutex_unlock(&dev->mutex);
+ return retval;
}
EXPORT_SYMBOL(input_flush_device);
+/**
+ * input_close_device - close input device
+ * @handle: handle through which device is being accessed
+ *
+ * This function should be called by input handlers when they
+ * want to stop receive events from given input device.
+ */
void input_close_device(struct input_handle *handle)
{
struct input_dev *dev = handle->dev;
- input_release_device(handle);
-
mutex_lock(&dev->mutex);
+ __input_release_device(handle);
+
if (!--dev->users && dev->close)
dev->close(dev);
- handle->open--;
+
+ if (!--handle->open) {
+ /*
+ * synchronize_rcu() makes sure that input_pass_event()
+ * completed and that no more input events are delivered
+ * through this handle
+ */
+ synchronize_rcu();
+ }
mutex_unlock(&dev->mutex);
}
EXPORT_SYMBOL(input_close_device);
-static void input_link_handle(struct input_handle *handle)
+/*
+ * Prepare device for unregistering
+ */
+static void input_disconnect_device(struct input_dev *dev)
{
- list_add_tail(&handle->d_node, &handle->dev->h_list);
- list_add_tail(&handle->h_node, &handle->handler->h_list);
+ struct input_handle *handle;
+ int code;
+
+ /*
+ * Mark device as going away. Note that we take dev->mutex here
+ * not to protect access to dev->going_away but rather to ensure
+ * that there are no threads in the middle of input_open_device()
+ */
+ mutex_lock(&dev->mutex);
+ dev->going_away = true;
+ mutex_unlock(&dev->mutex);
+
+ spin_lock_irq(&dev->event_lock);
+
+ /*
+ * Simulate keyup events for all pressed keys so that handlers
+ * are not left with "stuck" keys. The driver may continue
+ * 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);
+ }
+
+ list_for_each_entry(handle, &dev->h_list, d_node)
+ handle->open = 0;
+
+ spin_unlock_irq(&dev->event_lock);
}
+static int input_fetch_keycode(struct input_dev *dev, int scancode)
+{
+ switch (dev->keycodesize) {
+ case 1:
+ return ((u8 *)dev->keycode)[scancode];
+
+ case 2:
+ return ((u16 *)dev->keycode)[scancode];
+
+ default:
+ return ((u32 *)dev->keycode)[scancode];
+ }
+}
+
+static int input_default_getkeycode(struct input_dev *dev,
+ int scancode, int *keycode)
+{
+ if (!dev->keycodesize)
+ return -EINVAL;
+
+ if (scancode >= dev->keycodemax)
+ return -EINVAL;
+
+ *keycode = input_fetch_keycode(dev, scancode);
+
+ return 0;
+}
+
+static int input_default_setkeycode(struct input_dev *dev,
+ int scancode, int keycode)
+{
+ int old_keycode;
+ int i;
+
+ if (scancode >= dev->keycodemax)
+ return -EINVAL;
+
+ if (!dev->keycodesize)
+ return -EINVAL;
+
+ if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8)))
+ return -EINVAL;
+
+ switch (dev->keycodesize) {
+ case 1: {
+ u8 *k = (u8 *)dev->keycode;
+ old_keycode = k[scancode];
+ k[scancode] = keycode;
+ break;
+ }
+ case 2: {
+ u16 *k = (u16 *)dev->keycode;
+ old_keycode = k[scancode];
+ k[scancode] = keycode;
+ break;
+ }
+ default: {
+ u32 *k = (u32 *)dev->keycode;
+ old_keycode = k[scancode];
+ k[scancode] = keycode;
+ break;
+ }
+ }
+
+ clear_bit(old_keycode, dev->keybit);
+ set_bit(keycode, dev->keybit);
+
+ for (i = 0; i < dev->keycodemax; i++) {
+ if (input_fetch_keycode(dev, i) == old_keycode) {
+ set_bit(old_keycode, dev->keybit);
+ break; /* Setting the bit twice is useless, so break */
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * input_get_keycode - retrieve keycode currently mapped to a given scancode
+ * @dev: input device which keymap is being queried
+ * @scancode: scancode (or its equivalent for device in question) for which
+ * keycode is needed
+ * @keycode: result
+ *
+ * This function should be called by anyone interested in retrieving current
+ * keymap. Presently keyboard and evdev handlers use it.
+ */
+int input_get_keycode(struct input_dev *dev, int scancode, int *keycode)
+{
+ if (scancode < 0)
+ return -EINVAL;
+
+ return dev->getkeycode(dev, scancode, keycode);
+}
+EXPORT_SYMBOL(input_get_keycode);
+
+/**
+ * input_get_keycode - assign new keycode to a given scancode
+ * @dev: input device which keymap is being updated
+ * @scancode: scancode (or its equivalent for device in question)
+ * @keycode: new keycode to be assigned to the scancode
+ *
+ * This function should be called by anyone needing to update current
+ * keymap. Presently keyboard and evdev handlers use it.
+ */
+int input_set_keycode(struct input_dev *dev, int scancode, int keycode)
+{
+ unsigned long flags;
+ int old_keycode;
+ int retval;
+
+ if (scancode < 0)
+ return -EINVAL;
+
+ if (keycode < 0 || keycode > KEY_MAX)
+ return -EINVAL;
+
+ spin_lock_irqsave(&dev->event_lock, flags);
+
+ retval = dev->getkeycode(dev, scancode, &old_keycode);
+ if (retval)
+ goto out;
+
+ retval = dev->setkeycode(dev, scancode, keycode);
+ if (retval)
+ goto out;
+
+ /*
+ * Simulate keyup event if keycode is not present
+ * in the keymap anymore
+ */
+ if (test_bit(EV_KEY, dev->evbit) &&
+ !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
+ __test_and_clear_bit(old_keycode, dev->key)) {
+
+ input_pass_event(dev, EV_KEY, old_keycode, 0);
+ if (dev->sync)
+ input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
+ }
+
+ out:
+ spin_unlock_irqrestore(&dev->event_lock, flags);
+
+ return retval;
+}
+EXPORT_SYMBOL(input_set_keycode);
+
#define MATCH_BIT(bit, max) \
- for (i = 0; i < NBITS(max); i++) \
+ for (i = 0; i < BITS_TO_LONGS(max); i++) \
if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
break; \
- if (i != NBITS(max)) \
+ if (i != BITS_TO_LONGS(max)) \
continue;
-static struct input_device_id *input_match_device(struct input_device_id *id, struct input_dev *dev)
+static const struct input_device_id *input_match_device(const struct input_device_id *id,
+ struct input_dev *dev)
{
int i;
return NULL;
}
+static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
+{
+ const struct input_device_id *id;
+ int error;
+
+ if (handler->blacklist && input_match_device(handler->blacklist, dev))
+ return -ENODEV;
+
+ id = input_match_device(handler->id_table, dev);
+ if (!id)
+ return -ENODEV;
+
+ error = handler->connect(handler, dev, id);
+ if (error && error != -ENODEV)
+ printk(KERN_ERR
+ "input: failed to attach handler %s to device %s, "
+ "error: %d\n",
+ handler->name, kobject_name(&dev->dev.kobj), error);
+
+ return error;
+}
+
+
#ifdef CONFIG_PROC_FS
static struct proc_dir_entry *proc_bus_input_dir;
static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
{
- int state = input_devices_state;
-
poll_wait(file, &input_devices_poll_wait, wait);
- if (state != input_devices_state)
+ if (file->f_version != input_devices_state) {
+ file->f_version = input_devices_state;
return POLLIN | POLLRDNORM;
+ }
return 0;
}
-static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos)
-{
- struct list_head *node;
- loff_t i = 0;
-
- list_for_each(node, list)
- if (i++ == *pos)
- return node;
-
- return NULL;
-}
+union input_seq_state {
+ struct {
+ unsigned short pos;
+ bool mutex_acquired;
+ };
+ void *p;
+};
-static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos)
+static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
{
- if (element->next == list)
- return NULL;
+ union input_seq_state *state = (union input_seq_state *)&seq->private;
+ int error;
- ++(*pos);
- return element->next;
-}
+ /* We need to fit into seq->private pointer */
+ BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
-static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
-{
- /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
+ error = mutex_lock_interruptible(&input_mutex);
+ if (error) {
+ state->mutex_acquired = false;
+ return ERR_PTR(error);
+ }
- return list_get_nth_element(&input_dev_list, pos);
+ state->mutex_acquired = true;
+
+ return seq_list_start(&input_dev_list, *pos);
}
static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
- return list_get_next_element(&input_dev_list, v, pos);
+ return seq_list_next(v, &input_dev_list, pos);
}
-static void input_devices_seq_stop(struct seq_file *seq, void *v)
+static void input_seq_stop(struct seq_file *seq, void *v)
{
- /* release lock here */
+ union input_seq_state *state = (union input_seq_state *)&seq->private;
+
+ if (state->mutex_acquired)
+ mutex_unlock(&input_mutex);
}
static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
{
int i;
- for (i = NBITS(max) - 1; i > 0; i--)
+ for (i = BITS_TO_LONGS(max) - 1; i > 0; i--)
if (bitmap[i])
break;
static int input_devices_seq_show(struct seq_file *seq, void *v)
{
struct input_dev *dev = container_of(v, struct input_dev, node);
- const char *path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
+ const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
struct input_handle *handle;
seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
+ seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
seq_printf(seq, "H: Handlers=");
list_for_each_entry(handle, &dev->h_list, d_node)
return 0;
}
-static struct seq_operations input_devices_seq_ops = {
+static const struct seq_operations input_devices_seq_ops = {
.start = input_devices_seq_start,
.next = input_devices_seq_next,
- .stop = input_devices_seq_stop,
+ .stop = input_seq_stop,
.show = input_devices_seq_show,
};
return seq_open(file, &input_devices_seq_ops);
}
-static struct file_operations input_devices_fileops = {
+static const struct file_operations input_devices_fileops = {
.owner = THIS_MODULE,
.open = input_proc_devices_open,
.poll = input_proc_devices_poll,
static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
{
- /* acquire lock here ... Yes, we do need locking, I knowi, I know... */
- seq->private = (void *)(unsigned long)*pos;
- return list_get_nth_element(&input_handler_list, pos);
+ union input_seq_state *state = (union input_seq_state *)&seq->private;
+ int error;
+
+ /* We need to fit into seq->private pointer */
+ BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
+
+ error = mutex_lock_interruptible(&input_mutex);
+ if (error) {
+ state->mutex_acquired = false;
+ return ERR_PTR(error);
+ }
+
+ state->mutex_acquired = true;
+ state->pos = *pos;
+
+ return seq_list_start(&input_handler_list, *pos);
}
static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
- seq->private = (void *)(unsigned long)(*pos + 1);
- return list_get_next_element(&input_handler_list, v, pos);
-}
+ union input_seq_state *state = (union input_seq_state *)&seq->private;
-static void input_handlers_seq_stop(struct seq_file *seq, void *v)
-{
- /* release lock here */
+ state->pos = *pos + 1;
+ return seq_list_next(v, &input_handler_list, pos);
}
static int input_handlers_seq_show(struct seq_file *seq, void *v)
{
struct input_handler *handler = container_of(v, struct input_handler, node);
+ union input_seq_state *state = (union input_seq_state *)&seq->private;
- seq_printf(seq, "N: Number=%ld Name=%s",
- (unsigned long)seq->private, handler->name);
+ seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
if (handler->fops)
seq_printf(seq, " Minor=%d", handler->minor);
seq_putc(seq, '\n');
return 0;
}
-static struct seq_operations input_handlers_seq_ops = {
+
+static const struct seq_operations input_handlers_seq_ops = {
.start = input_handlers_seq_start,
.next = input_handlers_seq_next,
- .stop = input_handlers_seq_stop,
+ .stop = input_seq_stop,
.show = input_handlers_seq_show,
};
return seq_open(file, &input_handlers_seq_ops);
}
-static struct file_operations input_handlers_fileops = {
+static const struct file_operations input_handlers_fileops = {
.owner = THIS_MODULE,
.open = input_proc_handlers_open,
.read = seq_read,
{
struct proc_dir_entry *entry;
- proc_bus_input_dir = proc_mkdir("input", proc_bus);
+ proc_bus_input_dir = proc_mkdir("bus/input", NULL);
if (!proc_bus_input_dir)
return -ENOMEM;
- proc_bus_input_dir->owner = THIS_MODULE;
-
- entry = create_proc_entry("devices", 0, proc_bus_input_dir);
+ entry = proc_create("devices", 0, proc_bus_input_dir,
+ &input_devices_fileops);
if (!entry)
goto fail1;
- entry->owner = THIS_MODULE;
- entry->proc_fops = &input_devices_fileops;
-
- entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
+ entry = proc_create("handlers", 0, proc_bus_input_dir,
+ &input_handlers_fileops);
if (!entry)
goto fail2;
- entry->owner = THIS_MODULE;
- entry->proc_fops = &input_handlers_fileops;
-
return 0;
fail2: remove_proc_entry("devices", proc_bus_input_dir);
- fail1: remove_proc_entry("input", proc_bus);
+ fail1: remove_proc_entry("bus/input", NULL);
return -ENOMEM;
}
{
remove_proc_entry("devices", proc_bus_input_dir);
remove_proc_entry("handlers", proc_bus_input_dir);
- remove_proc_entry("input", proc_bus);
+ remove_proc_entry("bus/input", NULL);
}
#else /* !CONFIG_PROC_FS */
static inline void input_proc_exit(void) { }
#endif
-#define INPUT_DEV_STRING_ATTR_SHOW(name) \
-static ssize_t input_dev_show_##name(struct class_device *dev, char *buf) \
-{ \
- struct input_dev *input_dev = to_input_dev(dev); \
- int retval; \
- \
- retval = mutex_lock_interruptible(&input_dev->mutex); \
- if (retval) \
- return retval; \
- \
- retval = scnprintf(buf, PAGE_SIZE, \
- "%s\n", input_dev->name ? input_dev->name : ""); \
- \
- mutex_unlock(&input_dev->mutex); \
- \
- return retval; \
-} \
-static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL);
+#define INPUT_DEV_STRING_ATTR_SHOW(name) \
+static ssize_t input_dev_show_##name(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
+{ \
+ struct input_dev *input_dev = to_input_dev(dev); \
+ \
+ return scnprintf(buf, PAGE_SIZE, "%s\n", \
+ input_dev->name ? input_dev->name : ""); \
+} \
+static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
INPUT_DEV_STRING_ATTR_SHOW(name);
INPUT_DEV_STRING_ATTR_SHOW(phys);
len += snprintf(buf, max(size, 0), "%c", name);
for (i = min_bit; i < max_bit; i++)
- if (bm[LONG(i)] & BIT(i))
+ if (bm[BIT_WORD(i)] & BIT_MASK(i))
len += snprintf(buf + len, max(size - len, 0), "%X,", i);
return len;
}
return len;
}
-static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
+static ssize_t input_dev_show_modalias(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
{
struct input_dev *id = to_input_dev(dev);
ssize_t len;
return min_t(int, len, PAGE_SIZE);
}
-static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
+static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
static struct attribute *input_dev_attrs[] = {
- &class_device_attr_name.attr,
- &class_device_attr_phys.attr,
- &class_device_attr_uniq.attr,
- &class_device_attr_modalias.attr,
+ &dev_attr_name.attr,
+ &dev_attr_phys.attr,
+ &dev_attr_uniq.attr,
+ &dev_attr_modalias.attr,
NULL
};
.attrs = input_dev_attrs,
};
-#define INPUT_DEV_ID_ATTR(name) \
-static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf) \
-{ \
- struct input_dev *input_dev = to_input_dev(dev); \
- return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
-} \
-static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
+#define INPUT_DEV_ID_ATTR(name) \
+static ssize_t input_dev_show_id_##name(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
+{ \
+ struct input_dev *input_dev = to_input_dev(dev); \
+ return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
+} \
+static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
INPUT_DEV_ID_ATTR(bustype);
INPUT_DEV_ID_ATTR(vendor);
INPUT_DEV_ID_ATTR(version);
static struct attribute *input_dev_id_attrs[] = {
- &class_device_attr_bustype.attr,
- &class_device_attr_vendor.attr,
- &class_device_attr_product.attr,
- &class_device_attr_version.attr,
+ &dev_attr_bustype.attr,
+ &dev_attr_vendor.attr,
+ &dev_attr_product.attr,
+ &dev_attr_version.attr,
NULL
};
int i;
int len = 0;
- for (i = NBITS(max) - 1; i > 0; i--)
+ for (i = BITS_TO_LONGS(max) - 1; i > 0; i--)
if (bitmap[i])
break;
return len;
}
-#define INPUT_DEV_CAP_ATTR(ev, bm) \
-static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf) \
-{ \
- struct input_dev *input_dev = to_input_dev(dev); \
- int len = input_print_bitmap(buf, PAGE_SIZE, \
- input_dev->bm##bit, ev##_MAX, 1); \
- return min_t(int, len, PAGE_SIZE); \
-} \
-static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
+#define INPUT_DEV_CAP_ATTR(ev, bm) \
+static ssize_t input_dev_show_cap_##bm(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
+{ \
+ struct input_dev *input_dev = to_input_dev(dev); \
+ int len = input_print_bitmap(buf, PAGE_SIZE, \
+ input_dev->bm##bit, ev##_MAX, 1); \
+ return min_t(int, len, PAGE_SIZE); \
+} \
+static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
INPUT_DEV_CAP_ATTR(EV, ev);
INPUT_DEV_CAP_ATTR(KEY, key);
INPUT_DEV_CAP_ATTR(SW, sw);
static struct attribute *input_dev_caps_attrs[] = {
- &class_device_attr_ev.attr,
- &class_device_attr_key.attr,
- &class_device_attr_rel.attr,
- &class_device_attr_abs.attr,
- &class_device_attr_msc.attr,
- &class_device_attr_led.attr,
- &class_device_attr_snd.attr,
- &class_device_attr_ff.attr,
- &class_device_attr_sw.attr,
+ &dev_attr_ev.attr,
+ &dev_attr_key.attr,
+ &dev_attr_rel.attr,
+ &dev_attr_abs.attr,
+ &dev_attr_msc.attr,
+ &dev_attr_led.attr,
+ &dev_attr_snd.attr,
+ &dev_attr_ff.attr,
+ &dev_attr_sw.attr,
NULL
};
.attrs = input_dev_caps_attrs,
};
-static void input_dev_release(struct class_device *class_dev)
+static const struct attribute_group *input_dev_attr_groups[] = {
+ &input_dev_attr_group,
+ &input_dev_id_attr_group,
+ &input_dev_caps_attr_group,
+ NULL
+};
+
+static void input_dev_release(struct device *device)
{
- struct input_dev *dev = to_input_dev(class_dev);
+ struct input_dev *dev = to_input_dev(device);
input_ff_destroy(dev);
kfree(dev);
* Input uevent interface - loading event handlers based on
* device bitfields.
*/
-static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
- char *buffer, int buffer_size, int *cur_len,
+static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
const char *name, unsigned long *bitmap, int max)
{
- if (*cur_index >= num_envp - 1)
- return -ENOMEM;
-
- envp[*cur_index] = buffer + *cur_len;
+ int len;
- *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
- if (*cur_len >= buffer_size)
+ if (add_uevent_var(env, "%s=", name))
return -ENOMEM;
- *cur_len += input_print_bitmap(buffer + *cur_len,
- max(buffer_size - *cur_len, 0),
- bitmap, max, 0) + 1;
- if (*cur_len > buffer_size)
+ len = input_print_bitmap(&env->buf[env->buflen - 1],
+ sizeof(env->buf) - env->buflen,
+ bitmap, max, 0);
+ if (len >= (sizeof(env->buf) - env->buflen))
return -ENOMEM;
- (*cur_index)++;
+ env->buflen += len;
return 0;
}
-static int input_add_uevent_modalias_var(char **envp, int num_envp, int *cur_index,
- char *buffer, int buffer_size, int *cur_len,
+static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
struct input_dev *dev)
{
- if (*cur_index >= num_envp - 1)
- return -ENOMEM;
-
- envp[*cur_index] = buffer + *cur_len;
+ int len;
- *cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0),
- "MODALIAS=");
- if (*cur_len >= buffer_size)
+ if (add_uevent_var(env, "MODALIAS="))
return -ENOMEM;
- *cur_len += input_print_modalias(buffer + *cur_len,
- max(buffer_size - *cur_len, 0),
- dev, 0) + 1;
- if (*cur_len > buffer_size)
+ len = input_print_modalias(&env->buf[env->buflen - 1],
+ sizeof(env->buf) - env->buflen,
+ dev, 0);
+ if (len >= (sizeof(env->buf) - env->buflen))
return -ENOMEM;
- (*cur_index)++;
+ env->buflen += len;
return 0;
}
#define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
do { \
- int err = add_uevent_var(envp, num_envp, &i, \
- buffer, buffer_size, &len, \
- fmt, val); \
+ int err = add_uevent_var(env, fmt, val); \
if (err) \
return err; \
} while (0)
#define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
do { \
- int err = input_add_uevent_bm_var(envp, num_envp, &i, \
- buffer, buffer_size, &len, \
- name, bm, max); \
+ int err = input_add_uevent_bm_var(env, name, bm, max); \
if (err) \
return err; \
} while (0)
#define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
do { \
- int err = input_add_uevent_modalias_var(envp, \
- num_envp, &i, \
- buffer, buffer_size, &len, \
- dev); \
+ int err = input_add_uevent_modalias_var(env, dev); \
if (err) \
return err; \
} while (0)
-static int input_dev_uevent(struct class_device *cdev, char **envp,
- int num_envp, char *buffer, int buffer_size)
+static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
{
- struct input_dev *dev = to_input_dev(cdev);
- int i = 0;
- int len = 0;
+ struct input_dev *dev = to_input_dev(device);
INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
dev->id.bustype, dev->id.vendor,
INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
- envp[i] = NULL;
return 0;
}
+#define INPUT_DO_TOGGLE(dev, type, bits, on) \
+ do { \
+ int i; \
+ bool active; \
+ \
+ if (!test_bit(EV_##type, dev->evbit)) \
+ break; \
+ \
+ for (i = 0; i < type##_MAX; i++) { \
+ if (!test_bit(i, dev->bits##bit)) \
+ continue; \
+ \
+ active = test_bit(i, dev->bits); \
+ if (!active && !on) \
+ continue; \
+ \
+ dev->event(dev, EV_##type, i, on ? active : 0); \
+ } \
+ } while (0)
+
+#ifdef CONFIG_PM
+static void input_dev_reset(struct input_dev *dev, bool activate)
+{
+ if (!dev->event)
+ return;
+
+ INPUT_DO_TOGGLE(dev, LED, led, activate);
+ INPUT_DO_TOGGLE(dev, SND, snd, activate);
+
+ if (activate && test_bit(EV_REP, dev->evbit)) {
+ dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
+ dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
+ }
+}
+
+static int input_dev_suspend(struct device *dev)
+{
+ struct input_dev *input_dev = to_input_dev(dev);
+
+ mutex_lock(&input_dev->mutex);
+ input_dev_reset(input_dev, false);
+ mutex_unlock(&input_dev->mutex);
+
+ return 0;
+}
+
+static int input_dev_resume(struct device *dev)
+{
+ struct input_dev *input_dev = to_input_dev(dev);
+
+ mutex_lock(&input_dev->mutex);
+ input_dev_reset(input_dev, true);
+ mutex_unlock(&input_dev->mutex);
+
+ return 0;
+}
+
+static const struct dev_pm_ops input_dev_pm_ops = {
+ .suspend = input_dev_suspend,
+ .resume = input_dev_resume,
+ .poweroff = input_dev_suspend,
+ .restore = input_dev_resume,
+};
+#endif /* CONFIG_PM */
+
+static struct device_type input_dev_type = {
+ .groups = input_dev_attr_groups,
+ .release = input_dev_release,
+ .uevent = input_dev_uevent,
+#ifdef CONFIG_PM
+ .pm = &input_dev_pm_ops,
+#endif
+};
+
+static char *input_devnode(struct device *dev, mode_t *mode)
+{
+ return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
+}
+
struct class input_class = {
- .name = "input",
- .release = input_dev_release,
- .uevent = input_dev_uevent,
+ .name = "input",
+ .devnode = input_devnode,
};
EXPORT_SYMBOL_GPL(input_class);
+/**
+ * input_allocate_device - allocate memory for new input device
+ *
+ * Returns prepared struct input_dev or NULL.
+ *
+ * NOTE: Use input_free_device() to free devices that have not been
+ * registered; input_unregister_device() should be used for already
+ * registered devices.
+ */
struct input_dev *input_allocate_device(void)
{
struct input_dev *dev;
dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
if (dev) {
- dev->dynalloc = 1;
- dev->cdev.class = &input_class;
- class_device_initialize(&dev->cdev);
+ dev->dev.type = &input_dev_type;
+ dev->dev.class = &input_class;
+ device_initialize(&dev->dev);
mutex_init(&dev->mutex);
+ spin_lock_init(&dev->event_lock);
INIT_LIST_HEAD(&dev->h_list);
INIT_LIST_HEAD(&dev->node);
+
+ __module_get(THIS_MODULE);
}
return dev;
}
EXPORT_SYMBOL(input_allocate_device);
+/**
+ * input_free_device - free memory occupied by input_dev structure
+ * @dev: input device to free
+ *
+ * This function should only be used if input_register_device()
+ * was not called yet or if it failed. Once device was registered
+ * use input_unregister_device() and memory will be freed once last
+ * reference to the device is dropped.
+ *
+ * Device should be allocated by input_allocate_device().
+ *
+ * NOTE: If there are references to the input device then memory
+ * will not be freed until last reference is dropped.
+ */
void input_free_device(struct input_dev *dev)
{
- if (dev) {
-
- mutex_lock(&dev->mutex);
- dev->name = dev->phys = dev->uniq = NULL;
- mutex_unlock(&dev->mutex);
-
+ if (dev)
input_put_device(dev);
- }
}
EXPORT_SYMBOL(input_free_device);
+/**
+ * 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...)
+ * @code: event code
+ *
+ * In addition to setting up corresponding bit in appropriate capability
+ * bitmap the function also adjusts dev->evbit.
+ */
+void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
+{
+ switch (type) {
+ case EV_KEY:
+ __set_bit(code, dev->keybit);
+ break;
+
+ case EV_REL:
+ __set_bit(code, dev->relbit);
+ break;
+
+ case EV_ABS:
+ __set_bit(code, dev->absbit);
+ break;
+
+ case EV_MSC:
+ __set_bit(code, dev->mscbit);
+ break;
+
+ case EV_SW:
+ __set_bit(code, dev->swbit);
+ break;
+
+ case EV_LED:
+ __set_bit(code, dev->ledbit);
+ break;
+
+ case EV_SND:
+ __set_bit(code, dev->sndbit);
+ break;
+
+ case EV_FF:
+ __set_bit(code, dev->ffbit);
+ break;
+
+ case EV_PWR:
+ /* do nothing */
+ break;
+
+ default:
+ printk(KERN_ERR
+ "input_set_capability: unknown type %u (code %u)\n",
+ type, code);
+ dump_stack();
+ return;
+ }
+
+ __set_bit(type, dev->evbit);
+}
+EXPORT_SYMBOL(input_set_capability);
+
+/**
+ * input_register_device - register device with input core
+ * @dev: device to be registered
+ *
+ * This function registers device with input core. The device must be
+ * allocated with input_allocate_device() and all it's capabilities
+ * set up before registering.
+ * If function fails the device must be freed with input_free_device().
+ * Once device has been successfully registered it can be unregistered
+ * with input_unregister_device(); input_free_device() should not be
+ * called in this case.
+ */
int input_register_device(struct input_dev *dev)
{
static atomic_t input_no = ATOMIC_INIT(0);
- struct input_handle *handle;
struct input_handler *handler;
- struct input_device_id *id;
const char *path;
int error;
- if (!dev->dynalloc) {
- printk(KERN_WARNING "input: device %s is statically allocated, will not register\n"
- "Please convert to input_allocate_device() or contact dtor_core@ameritech.net\n",
- dev->name ? dev->name : "<Unknown>");
- return -EINVAL;
- }
-
- set_bit(EV_SYN, dev->evbit);
+ __set_bit(EV_SYN, dev->evbit);
/*
* If delay and period are pre-set by the driver, then autorepeating
dev->rep[REP_PERIOD] = 33;
}
- INIT_LIST_HEAD(&dev->h_list);
- list_add_tail(&dev->node, &input_dev_list);
-
- dev->cdev.class = &input_class;
- snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
- "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
+ if (!dev->getkeycode)
+ dev->getkeycode = input_default_getkeycode;
- error = class_device_add(&dev->cdev);
- if (error)
- return error;
+ if (!dev->setkeycode)
+ dev->setkeycode = input_default_setkeycode;
- error = sysfs_create_group(&dev->cdev.kobj, &input_dev_attr_group);
- if (error)
- goto fail1;
-
- error = sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group);
- if (error)
- goto fail2;
+ dev_set_name(&dev->dev, "input%ld",
+ (unsigned long) atomic_inc_return(&input_no) - 1);
- error = sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
+ error = device_add(&dev->dev);
if (error)
- goto fail3;
-
- __module_get(THIS_MODULE);
+ return error;
- path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
+ path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
printk(KERN_INFO "input: %s as %s\n",
dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
kfree(path);
+ error = mutex_lock_interruptible(&input_mutex);
+ if (error) {
+ device_del(&dev->dev);
+ return error;
+ }
+
+ list_add_tail(&dev->node, &input_dev_list);
+
list_for_each_entry(handler, &input_handler_list, node)
- if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
- if ((id = input_match_device(handler->id_table, dev)))
- if ((handle = handler->connect(handler, dev, id))) {
- input_link_handle(handle);
- if (handler->start)
- handler->start(handle);
- }
+ input_attach_handler(dev, handler);
input_wakeup_procfs_readers();
- return 0;
+ mutex_unlock(&input_mutex);
- fail3: sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
- fail2: sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
- fail1: class_device_del(&dev->cdev);
- return error;
+ return 0;
}
EXPORT_SYMBOL(input_register_device);
+/**
+ * input_unregister_device - unregister previously registered device
+ * @dev: device to be unregistered
+ *
+ * This function unregisters an input device. Once device is unregistered
+ * the caller should not try to access it as it may get freed at any moment.
+ */
void input_unregister_device(struct input_dev *dev)
{
- struct list_head *node, *next;
+ struct input_handle *handle, *next;
- if (!dev)
- return;
+ input_disconnect_device(dev);
- del_timer_sync(&dev->timer);
+ mutex_lock(&input_mutex);
- list_for_each_safe(node, next, &dev->h_list) {
- struct input_handle * handle = to_handle(node);
- list_del_init(&handle->d_node);
- list_del_init(&handle->h_node);
+ list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
handle->handler->disconnect(handle);
- }
+ WARN_ON(!list_empty(&dev->h_list));
+ del_timer_sync(&dev->timer);
list_del_init(&dev->node);
- sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
- sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
- sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
-
- mutex_lock(&dev->mutex);
- dev->name = dev->phys = dev->uniq = NULL;
- mutex_unlock(&dev->mutex);
+ input_wakeup_procfs_readers();
- class_device_unregister(&dev->cdev);
+ mutex_unlock(&input_mutex);
- input_wakeup_procfs_readers();
+ device_unregister(&dev->dev);
}
EXPORT_SYMBOL(input_unregister_device);
-void input_register_handler(struct input_handler *handler)
+/**
+ * input_register_handler - register a new input handler
+ * @handler: handler to be registered
+ *
+ * This function registers a new input handler (interface) for input
+ * devices in the system and attaches it to all input devices that
+ * are compatible with the handler.
+ */
+int input_register_handler(struct input_handler *handler)
{
struct input_dev *dev;
- struct input_handle *handle;
- struct input_device_id *id;
+ int retval;
- if (!handler)
- return;
+ retval = mutex_lock_interruptible(&input_mutex);
+ if (retval)
+ return retval;
INIT_LIST_HEAD(&handler->h_list);
- if (handler->fops != NULL)
+ if (handler->fops != NULL) {
+ if (input_table[handler->minor >> 5]) {
+ retval = -EBUSY;
+ goto out;
+ }
input_table[handler->minor >> 5] = handler;
+ }
list_add_tail(&handler->node, &input_handler_list);
list_for_each_entry(dev, &input_dev_list, node)
- if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
- if ((id = input_match_device(handler->id_table, dev)))
- if ((handle = handler->connect(handler, dev, id))) {
- input_link_handle(handle);
- if (handler->start)
- handler->start(handle);
- }
+ input_attach_handler(dev, handler);
input_wakeup_procfs_readers();
+
+ out:
+ mutex_unlock(&input_mutex);
+ return retval;
}
EXPORT_SYMBOL(input_register_handler);
+/**
+ * input_unregister_handler - unregisters an input handler
+ * @handler: handler to be unregistered
+ *
+ * This function disconnects a handler from its input devices and
+ * removes it from lists of known handlers.
+ */
void input_unregister_handler(struct input_handler *handler)
{
- struct list_head *node, *next;
+ struct input_handle *handle, *next;
+
+ mutex_lock(&input_mutex);
- list_for_each_safe(node, next, &handler->h_list) {
- struct input_handle * handle = to_handle_h(node);
- list_del_init(&handle->h_node);
- list_del_init(&handle->d_node);
+ list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
handler->disconnect(handle);
- }
+ WARN_ON(!list_empty(&handler->h_list));
list_del_init(&handler->node);
input_table[handler->minor >> 5] = NULL;
input_wakeup_procfs_readers();
+
+ mutex_unlock(&input_mutex);
}
EXPORT_SYMBOL(input_unregister_handler);
+/**
+ * input_handler_for_each_handle - handle iterator
+ * @handler: input handler to iterate
+ * @data: data for the callback
+ * @fn: function to be called for each handle
+ *
+ * Iterate over @bus's list of devices, and call @fn for each, passing
+ * it @data and stop when @fn returns a non-zero value. The function is
+ * using RCU to traverse the list and therefore may be usind in atonic
+ * contexts. The @fn callback is invoked from RCU critical section and
+ * thus must not sleep.
+ */
+int input_handler_for_each_handle(struct input_handler *handler, void *data,
+ int (*fn)(struct input_handle *, void *))
+{
+ struct input_handle *handle;
+ int retval = 0;
+
+ rcu_read_lock();
+
+ list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
+ retval = fn(handle, data);
+ if (retval)
+ break;
+ }
+
+ rcu_read_unlock();
+
+ return retval;
+}
+EXPORT_SYMBOL(input_handler_for_each_handle);
+
+/**
+ * input_register_handle - register a new input handle
+ * @handle: handle to register
+ *
+ * This function puts a new input handle onto device's
+ * and handler's lists so that events can flow through
+ * it once it is opened using input_open_device().
+ *
+ * This function is supposed to be called from handler's
+ * connect() method.
+ */
+int input_register_handle(struct input_handle *handle)
+{
+ struct input_handler *handler = handle->handler;
+ struct input_dev *dev = handle->dev;
+ int error;
+
+ /*
+ * We take dev->mutex here to prevent race with
+ * input_release_device().
+ */
+ error = mutex_lock_interruptible(&dev->mutex);
+ if (error)
+ return error;
+ list_add_tail_rcu(&handle->d_node, &dev->h_list);
+ mutex_unlock(&dev->mutex);
+
+ /*
+ * Since we are supposed to be called from ->connect()
+ * which is mutually exclusive with ->disconnect()
+ * we can't be racing with input_unregister_handle()
+ * and so separate lock is not needed here.
+ */
+ list_add_tail_rcu(&handle->h_node, &handler->h_list);
+
+ if (handler->start)
+ handler->start(handle);
+
+ return 0;
+}
+EXPORT_SYMBOL(input_register_handle);
+
+/**
+ * input_unregister_handle - unregister an input handle
+ * @handle: handle to unregister
+ *
+ * This function removes input handle from device's
+ * and handler's lists.
+ *
+ * This function is supposed to be called from handler's
+ * disconnect() method.
+ */
+void input_unregister_handle(struct input_handle *handle)
+{
+ struct input_dev *dev = handle->dev;
+
+ list_del_rcu(&handle->h_node);
+
+ /*
+ * Take dev->mutex to prevent race with input_release_device().
+ */
+ mutex_lock(&dev->mutex);
+ list_del_rcu(&handle->d_node);
+ mutex_unlock(&dev->mutex);
+
+ synchronize_rcu();
+}
+EXPORT_SYMBOL(input_unregister_handle);
+
static int input_open_file(struct inode *inode, struct file *file)
{
- struct input_handler *handler = input_table[iminor(inode) >> 5];
+ struct input_handler *handler;
const struct file_operations *old_fops, *new_fops = NULL;
int err;
+ lock_kernel();
/* No load-on-demand here? */
- if (!handler || !(new_fops = fops_get(handler->fops)))
- return -ENODEV;
+ handler = input_table[iminor(inode) >> 5];
+ if (!handler || !(new_fops = fops_get(handler->fops))) {
+ err = -ENODEV;
+ goto out;
+ }
/*
* That's _really_ odd. Usually NULL ->open means "nothing special",
*/
if (!new_fops->open) {
fops_put(new_fops);
- return -ENODEV;
+ err = -ENODEV;
+ goto out;
}
old_fops = file->f_op;
file->f_op = new_fops;
file->f_op = fops_get(old_fops);
}
fops_put(old_fops);
+out:
+ unlock_kernel();
return err;
}
-static struct file_operations input_fops = {
+static const struct file_operations input_fops = {
.owner = THIS_MODULE,
.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");
Code Review / linux-2.6.git / blobdiff