*/
#include <linux/init.h>
+#include <linux/types.h>
#include <linux/input.h>
#include <linux/module.h>
+#include <linux/slab.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/poll.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/rcupdate.h>
+#include <linux/smp_lock.h>
+#include "input-compat.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,
+ 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);
}
/*
- * Pass event through all open handles. This function is called with
+ * Pass event first through all filters and then, if event has not been
+ * filtered out, 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_handler *handler;
struct input_handle *handle;
rcu_read_lock();
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);
+ else {
+ bool filtered = false;
+
+ list_for_each_entry_rcu(handle, &dev->h_list, d_node) {
+ if (!handle->open)
+ continue;
+
+ handler = handle->handler;
+ if (!handler->filter) {
+ if (filtered)
+ break;
+
+ handler->event(handle, type, code, value);
+
+ } else if (handler->filter(handle, type, code, value))
+ filtered = true;
+ }
+ }
+
rcu_read_unlock();
}
}
}
+static void input_stop_autorepeat(struct input_dev *dev)
+{
+ del_timer(&dev->timer);
+}
+
#define INPUT_IGNORE_EVENT 0
#define INPUT_PASS_TO_HANDLERS 1
#define INPUT_PASS_TO_DEVICE 2
disposition = INPUT_PASS_TO_HANDLERS;
}
break;
+ case SYN_MT_REPORT:
+ dev->sync = 0;
+ disposition = INPUT_PASS_TO_HANDLERS;
+ break;
}
break;
__change_bit(code, dev->key);
if (value)
input_start_autorepeat(dev, code);
+ else
+ input_stop_autorepeat(dev);
}
disposition = INPUT_PASS_TO_HANDLERS;
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;
+ }
+
value = input_defuzz_abs_event(value,
dev->abs[code], dev->absfuzz[code]);
if (value >= 0)
disposition = INPUT_PASS_TO_ALL;
break;
+
+ case EV_PWR:
+ disposition = INPUT_PASS_TO_ALL;
+ break;
}
- if (type != EV_SYN)
+ if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN)
dev->sync = 0;
if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
* @value: value of the event
*
* This function should be used by drivers implementing various input
- * devices. See also input_inject_event().
+ * devices to report input events. See also input_inject_event().
+ *
+ * NOTE: input_event() may be safely used right after input device was
+ * allocated with input_allocate_device(), even before it is registered
+ * with input_register_device(), but the event will not reach any of the
+ * input handlers. Such early invocation of input_event() may be used
+ * to 'seed' initial state of a switch or initial position of absolute
+ * axis, etc.
*/
-
void input_event(struct input_dev *dev,
unsigned int type, unsigned int code, int value)
{
* that there are no threads in the middle of input_open_device()
*/
mutex_lock(&dev->mutex);
- dev->going_away = 1;
+ dev->going_away = true;
mutex_unlock(&dev->mutex);
spin_lock_irq(&dev->event_lock);
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_bit(code, dev->key)) {
+ __test_and_clear_bit(code, dev->key)) {
input_pass_event(dev, EV_KEY, code, 0);
}
}
}
static int input_default_getkeycode(struct input_dev *dev,
- int scancode, int *keycode)
+ unsigned int scancode,
+ unsigned int *keycode)
{
if (!dev->keycodesize)
return -EINVAL;
- if (scancode < 0 || scancode >= dev->keycodemax)
+ if (scancode >= dev->keycodemax)
return -EINVAL;
*keycode = input_fetch_keycode(dev, scancode);
}
static int input_default_setkeycode(struct input_dev *dev,
- int scancode, int keycode)
+ unsigned int scancode,
+ unsigned int keycode)
{
int old_keycode;
int i;
- if (scancode < 0 || scancode >= dev->keycodemax)
- return -EINVAL;
-
- if (keycode < 0 || keycode > KEY_MAX)
+ if (scancode >= dev->keycodemax)
return -EINVAL;
if (!dev->keycodesize)
}
}
- clear_bit(old_keycode, dev->keybit);
- set_bit(keycode, dev->keybit);
+ __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);
+ __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,
+ unsigned int scancode, unsigned int *keycode)
+{
+ 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,
+ unsigned int scancode, unsigned int keycode)
+{
+ unsigned long flags;
+ int old_keycode;
+ int retval;
+
+ if (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;
+
+ /* Make sure KEY_RESERVED did not get enabled. */
+ __clear_bit(KEY_RESERVED, dev->keybit);
+
+ /*
+ * 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 < BITS_TO_LONGS(max); i++) \
if (i != BITS_TO_LONGS(max)) \
continue;
-static const struct input_device_id *input_match_device(const struct input_device_id *id,
+static const struct input_device_id *input_match_device(struct input_handler *handler,
struct input_dev *dev)
{
+ const struct input_device_id *id;
int i;
- for (; id->flags || id->driver_info; id++) {
+ for (id = handler->id_table; id->flags || id->driver_info; id++) {
if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
if (id->bustype != dev->id.bustype)
MATCH_BIT(ffbit, FF_MAX);
MATCH_BIT(swbit, SW_MAX);
- return id;
+ if (!handler->match || handler->match(handler, dev))
+ return id;
}
return NULL;
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);
+ id = input_match_device(handler, dev);
if (!id)
return -ENODEV;
return error;
}
+#ifdef CONFIG_COMPAT
+
+static int input_bits_to_string(char *buf, int buf_size,
+ unsigned long bits, bool skip_empty)
+{
+ int len = 0;
+
+ if (INPUT_COMPAT_TEST) {
+ u32 dword = bits >> 32;
+ if (dword || !skip_empty)
+ len += snprintf(buf, buf_size, "%x ", dword);
+
+ dword = bits & 0xffffffffUL;
+ if (dword || !skip_empty || len)
+ len += snprintf(buf + len, max(buf_size - len, 0),
+ "%x", dword);
+ } else {
+ if (bits || !skip_empty)
+ len += snprintf(buf, buf_size, "%lx", bits);
+ }
+
+ return len;
+}
+
+#else /* !CONFIG_COMPAT */
+
+static int input_bits_to_string(char *buf, int buf_size,
+ unsigned long bits, bool skip_empty)
+{
+ return bits || !skip_empty ?
+ snprintf(buf, buf_size, "%lx", bits) : 0;
+}
+
+#endif
#ifdef CONFIG_PROC_FS
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;
}
+union input_seq_state {
+ struct {
+ unsigned short pos;
+ bool mutex_acquired;
+ };
+ void *p;
+};
+
static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
{
- if (mutex_lock_interruptible(&input_mutex))
- return NULL;
+ 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;
return seq_list_start(&input_dev_list, *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)
{
- mutex_unlock(&input_mutex);
+ 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,
unsigned long *bitmap, int max)
{
int i;
-
- for (i = BITS_TO_LONGS(max) - 1; i > 0; i--)
- if (bitmap[i])
- break;
+ bool skip_empty = true;
+ char buf[18];
seq_printf(seq, "B: %s=", name);
- for (; i >= 0; i--)
- seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
+
+ for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
+ if (input_bits_to_string(buf, sizeof(buf),
+ bitmap[i], skip_empty)) {
+ skip_empty = false;
+ seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
+ }
+ }
+
+ /*
+ * If no output was produced print a single 0.
+ */
+ if (skip_empty)
+ seq_puts(seq, "0");
+
seq_putc(seq, '\n');
}
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,
};
static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
{
- if (mutex_lock_interruptible(&input_mutex))
- return NULL;
+ 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;
- seq->private = (void *)(unsigned long)*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 seq_list_next(v, &input_handler_list, pos);
-}
+ union input_seq_state *state = (union input_seq_state *)&seq->private;
-static void input_handlers_seq_stop(struct seq_file *seq, void *v)
-{
- mutex_unlock(&input_mutex);
+ 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->filter)
+ seq_puts(seq, " (filter)");
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,
};
{
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 */
{
int i;
int len = 0;
+ bool skip_empty = true;
+
+ for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
+ len += input_bits_to_string(buf + len, max(buf_size - len, 0),
+ bitmap[i], skip_empty);
+ if (len) {
+ skip_empty = false;
+ if (i > 0)
+ len += snprintf(buf + len, max(buf_size - len, 0), " ");
+ }
+ }
- for (i = BITS_TO_LONGS(max) - 1; i > 0; i--)
- if (bitmap[i])
- break;
-
- for (; i >= 0; i--)
- len += snprintf(buf + len, max(buf_size - len, 0),
- "%lx%s", bitmap[i], i > 0 ? " " : "");
+ /*
+ * If no output was produced print a single 0.
+ */
+ if (len == 0)
+ len = snprintf(buf, buf_size, "%d", 0);
if (add_cr)
len += snprintf(buf + len, max(buf_size - len, 0), "\n");
{ \
struct input_dev *input_dev = to_input_dev(dev); \
int len = input_print_bitmap(buf, PAGE_SIZE, \
- input_dev->bm##bit, ev##_MAX, 1); \
+ input_dev->bm##bit, ev##_MAX, \
+ true); \
return min_t(int, len, PAGE_SIZE); \
} \
static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
.attrs = input_dev_caps_attrs,
};
-static struct attribute_group *input_dev_attr_groups[] = {
+static const struct attribute_group *input_dev_attr_groups[] = {
&input_dev_attr_group,
&input_dev_id_attr_group,
&input_dev_caps_attr_group,
len = input_print_bitmap(&env->buf[env->buflen - 1],
sizeof(env->buf) - env->buflen,
- bitmap, max, 0);
+ bitmap, max, false);
if (len >= (sizeof(env->buf) - env->buflen))
return -ENOMEM;
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",
+ .devnode = input_devnode,
};
EXPORT_SYMBOL_GPL(input_class);
__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",
}
EXPORT_SYMBOL(input_set_capability);
+#define INPUT_CLEANSE_BITMASK(dev, type, bits) \
+ do { \
+ if (!test_bit(EV_##type, dev->evbit)) \
+ memset(dev->bits##bit, 0, \
+ sizeof(dev->bits##bit)); \
+ } while (0)
+
+static void input_cleanse_bitmasks(struct input_dev *dev)
+{
+ INPUT_CLEANSE_BITMASK(dev, KEY, key);
+ INPUT_CLEANSE_BITMASK(dev, REL, rel);
+ INPUT_CLEANSE_BITMASK(dev, ABS, abs);
+ INPUT_CLEANSE_BITMASK(dev, MSC, msc);
+ INPUT_CLEANSE_BITMASK(dev, LED, led);
+ INPUT_CLEANSE_BITMASK(dev, SND, snd);
+ INPUT_CLEANSE_BITMASK(dev, FF, ff);
+ INPUT_CLEANSE_BITMASK(dev, SW, sw);
+}
+
/**
* input_register_device - register device with input core
* @dev: device to be registered
const char *path;
int error;
+ /* Every input device generates EV_SYN/SYN_REPORT events. */
__set_bit(EV_SYN, dev->evbit);
+ /* KEY_RESERVED is not supposed to be transmitted to userspace. */
+ __clear_bit(KEY_RESERVED, dev->keybit);
+
+ /* Make sure that bitmasks not mentioned in dev->evbit are clean. */
+ input_cleanse_bitmasks(dev);
+
/*
* If delay and period are pre-set by the driver, then autorepeating
* is handled by the driver itself and we don't do it in input.c.
*/
-
init_timer(&dev->timer);
if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
dev->timer.data = (long) dev;
if (!dev->setkeycode)
dev->setkeycode = input_default_setkeycode;
- snprintf(dev->dev.bus_id, sizeof(dev->dev.bus_id),
- "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
-
- if (dev->cdev.dev)
- dev->dev.parent = dev->cdev.dev;
+ dev_set_name(&dev->dev, "input%ld",
+ (unsigned long) atomic_inc_return(&input_no) - 1);
error = device_add(&dev->dev);
if (error)
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
*
error = mutex_lock_interruptible(&dev->mutex);
if (error)
return error;
- list_add_tail_rcu(&handle->d_node, &dev->h_list);
+
+ /*
+ * Filters go to the head of the list, normal handlers
+ * to the tail.
+ */
+ if (handler->filter)
+ list_add_rcu(&handle->d_node, &dev->h_list);
+ else
+ list_add_tail_rcu(&handle->d_node, &dev->h_list);
+
mutex_unlock(&dev->mutex);
- synchronize_rcu();
/*
* Since we are supposed to be called from ->connect()
* we can't be racing with input_unregister_handle()
* and so separate lock is not needed here.
*/
- list_add_tail(&handle->h_node, &handler->h_list);
+ list_add_tail_rcu(&handle->h_node, &handler->h_list);
if (handler->start)
handler->start(handle);
{
struct input_dev *dev = handle->dev;
- list_del_init(&handle->h_node);
+ 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;
+ err = mutex_lock_interruptible(&input_mutex);
+ if (err)
+ return err;
+
/* 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);
+
+ mutex_unlock(&input_mutex);
/*
* That's _really_ odd. Usually NULL ->open means "nothing special",
* not "no device". Oh, well...
*/
- if (!new_fops->open) {
+ if (!new_fops || !new_fops->open) {
fops_put(new_fops);
- return -ENODEV;
+ err = -ENODEV;
+ goto out;
}
+
old_fops = file->f_op;
file->f_op = new_fops;
err = new_fops->open(inode, file);
-
if (err) {
fops_put(file->f_op);
file->f_op = fops_get(old_fops);
}
fops_put(old_fops);
+out:
return err;
}
.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");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff