kernel-ark/drivers/input/input.c
Rusty Russell 1d8f430c15 [PATCH] Input: add modalias support
Here's the patch for modalias support for input classes.  It uses
comma-separated numbers, and doesn't describe all the potential keys (no
module currently cares, and that would make the strings huge).  The
changes to input.h are to move the definitions needed by file2alias
outside __KERNEL__.  I chose not to move those definitions to
mod_devicetable.h, because there are so many that it might break compile
of something else in the kernel.

The rest is fairly straightforward.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
CC: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-01-04 16:18:09 -08:00

976 lines
23 KiB
C

/*
* The input core
*
* Copyright (c) 1999-2002 Vojtech Pavlik
*/
/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*/
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/smp_lock.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/random.h>
#include <linux/major.h>
#include <linux/proc_fs.h>
#include <linux/interrupt.h>
#include <linux/poll.h>
#include <linux/device.h>
MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
MODULE_DESCRIPTION("Input core");
MODULE_LICENSE("GPL");
EXPORT_SYMBOL(input_allocate_device);
EXPORT_SYMBOL(input_register_device);
EXPORT_SYMBOL(input_unregister_device);
EXPORT_SYMBOL(input_register_handler);
EXPORT_SYMBOL(input_unregister_handler);
EXPORT_SYMBOL(input_grab_device);
EXPORT_SYMBOL(input_release_device);
EXPORT_SYMBOL(input_open_device);
EXPORT_SYMBOL(input_close_device);
EXPORT_SYMBOL(input_accept_process);
EXPORT_SYMBOL(input_flush_device);
EXPORT_SYMBOL(input_event);
EXPORT_SYMBOL_GPL(input_class);
#define INPUT_DEVICES 256
static LIST_HEAD(input_dev_list);
static LIST_HEAD(input_handler_list);
static struct input_handler *input_table[8];
void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
{
struct input_handle *handle;
if (type > EV_MAX || !test_bit(type, dev->evbit))
return;
add_input_randomness(type, code, value);
switch (type) {
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;
case EV_KEY:
if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value)
return;
if (value == 2)
break;
change_bit(code, dev->key);
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]));
}
break;
case EV_SW:
if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value)
return;
change_bit(code, dev->sw);
break;
case EV_ABS:
if (code > ABS_MAX || !test_bit(code, dev->absbit))
return;
if (dev->absfuzz[code]) {
if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) &&
(value < dev->abs[code] + (dev->absfuzz[code] >> 1)))
return;
if ((value > dev->abs[code] - dev->absfuzz[code]) &&
(value < dev->abs[code] + dev->absfuzz[code]))
value = (dev->abs[code] * 3 + value) >> 2;
if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) &&
(value < dev->abs[code] + (dev->absfuzz[code] << 1)))
value = (dev->abs[code] + value) >> 1;
}
if (dev->abs[code] == value)
return;
dev->abs[code] = value;
break;
case EV_REL:
if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0))
return;
break;
case EV_MSC:
if (code > MSC_MAX || !test_bit(code, dev->mscbit))
return;
if (dev->event) dev->event(dev, type, code, value);
break;
case EV_LED:
if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value)
return;
change_bit(code, dev->led);
if (dev->event) dev->event(dev, type, code, value);
break;
case EV_SND:
if (code > SND_MAX || !test_bit(code, dev->sndbit))
return;
if (dev->event) dev->event(dev, type, code, value);
break;
case EV_REP:
if (code > REP_MAX || value < 0 || dev->rep[code] == value) return;
dev->rep[code] = value;
if (dev->event) dev->event(dev, type, code, value);
break;
case EV_FF:
if (dev->event) dev->event(dev, type, code, value);
break;
}
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);
}
static void input_repeat_key(unsigned long data)
{
struct input_dev *dev = (void *) data;
if (!test_bit(dev->repeat_key, dev->key))
return;
input_event(dev, EV_KEY, dev->repeat_key, 2);
input_sync(dev);
if (dev->rep[REP_PERIOD])
mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD]));
}
int input_accept_process(struct input_handle *handle, struct file *file)
{
if (handle->dev->accept)
return handle->dev->accept(handle->dev, file);
return 0;
}
int input_grab_device(struct input_handle *handle)
{
if (handle->dev->grab)
return -EBUSY;
handle->dev->grab = handle;
return 0;
}
void input_release_device(struct input_handle *handle)
{
if (handle->dev->grab == handle)
handle->dev->grab = NULL;
}
int input_open_device(struct input_handle *handle)
{
struct input_dev *dev = handle->dev;
int err;
err = down_interruptible(&dev->sem);
if (err)
return err;
handle->open++;
if (!dev->users++ && dev->open)
err = dev->open(dev);
if (err)
handle->open--;
up(&dev->sem);
return err;
}
int input_flush_device(struct input_handle* handle, struct file* file)
{
if (handle->dev->flush)
return handle->dev->flush(handle->dev, file);
return 0;
}
void input_close_device(struct input_handle *handle)
{
struct input_dev *dev = handle->dev;
input_release_device(handle);
down(&dev->sem);
if (!--dev->users && dev->close)
dev->close(dev);
handle->open--;
up(&dev->sem);
}
static void input_link_handle(struct input_handle *handle)
{
list_add_tail(&handle->d_node, &handle->dev->h_list);
list_add_tail(&handle->h_node, &handle->handler->h_list);
}
#define MATCH_BIT(bit, max) \
for (i = 0; i < NBITS(max); i++) \
if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
break; \
if (i != NBITS(max)) \
continue;
static struct input_device_id *input_match_device(struct input_device_id *id, struct input_dev *dev)
{
int i;
for (; id->flags || id->driver_info; id++) {
if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
if (id->id.bustype != dev->id.bustype)
continue;
if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
if (id->id.vendor != dev->id.vendor)
continue;
if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
if (id->id.product != dev->id.product)
continue;
if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
if (id->id.version != dev->id.version)
continue;
MATCH_BIT(evbit, EV_MAX);
MATCH_BIT(keybit, KEY_MAX);
MATCH_BIT(relbit, REL_MAX);
MATCH_BIT(absbit, ABS_MAX);
MATCH_BIT(mscbit, MSC_MAX);
MATCH_BIT(ledbit, LED_MAX);
MATCH_BIT(sndbit, SND_MAX);
MATCH_BIT(ffbit, FF_MAX);
MATCH_BIT(swbit, SW_MAX);
return id;
}
return NULL;
}
static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, int max)
{
int i;
int len = 0;
for (i = NBITS(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 ? " " : "");
return len;
}
#ifdef CONFIG_PROC_FS
static struct proc_dir_entry *proc_bus_input_dir;
static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
static int input_devices_state;
static inline void input_wakeup_procfs_readers(void)
{
input_devices_state++;
wake_up(&input_devices_poll_wait);
}
static unsigned int input_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)
return POLLIN | POLLRDNORM;
return 0;
}
#define SPRINTF_BIT(ev, bm) \
do { \
len += sprintf(buf + len, "B: %s=", #ev); \
len += input_print_bitmap(buf + len, INT_MAX, \
dev->bm##bit, ev##_MAX); \
len += sprintf(buf + len, "\n"); \
} while (0)
#define TEST_AND_SPRINTF_BIT(ev, bm) \
do { \
if (test_bit(EV_##ev, dev->evbit)) \
SPRINTF_BIT(ev, bm); \
} while (0)
static int input_devices_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
{
struct input_dev *dev;
struct input_handle *handle;
const char *path;
off_t at = 0;
int len, cnt = 0;
list_for_each_entry(dev, &input_dev_list, node) {
path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
len = sprintf(buf, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
len += sprintf(buf + len, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
len += sprintf(buf + len, "P: Phys=%s\n", dev->phys ? dev->phys : "");
len += sprintf(buf + len, "S: Sysfs=%s\n", path ? path : "");
len += sprintf(buf + len, "H: Handlers=");
list_for_each_entry(handle, &dev->h_list, d_node)
len += sprintf(buf + len, "%s ", handle->name);
len += sprintf(buf + len, "\n");
SPRINTF_BIT(EV, ev);
TEST_AND_SPRINTF_BIT(KEY, key);
TEST_AND_SPRINTF_BIT(REL, rel);
TEST_AND_SPRINTF_BIT(ABS, abs);
TEST_AND_SPRINTF_BIT(MSC, msc);
TEST_AND_SPRINTF_BIT(LED, led);
TEST_AND_SPRINTF_BIT(SND, snd);
TEST_AND_SPRINTF_BIT(FF, ff);
TEST_AND_SPRINTF_BIT(SW, sw);
len += sprintf(buf + len, "\n");
at += len;
if (at >= pos) {
if (!*start) {
*start = buf + (pos - (at - len));
cnt = at - pos;
} else cnt += len;
buf += len;
if (cnt >= count)
break;
}
kfree(path);
}
if (&dev->node == &input_dev_list)
*eof = 1;
return (count > cnt) ? cnt : count;
}
static int input_handlers_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
{
struct input_handler *handler;
off_t at = 0;
int len = 0, cnt = 0;
int i = 0;
list_for_each_entry(handler, &input_handler_list, node) {
if (handler->fops)
len = sprintf(buf, "N: Number=%d Name=%s Minor=%d\n",
i++, handler->name, handler->minor);
else
len = sprintf(buf, "N: Number=%d Name=%s\n",
i++, handler->name);
at += len;
if (at >= pos) {
if (!*start) {
*start = buf + (pos - (at - len));
cnt = at - pos;
} else cnt += len;
buf += len;
if (cnt >= count)
break;
}
}
if (&handler->node == &input_handler_list)
*eof = 1;
return (count > cnt) ? cnt : count;
}
static struct file_operations input_fileops;
static int __init input_proc_init(void)
{
struct proc_dir_entry *entry;
proc_bus_input_dir = proc_mkdir("input", proc_bus);
if (!proc_bus_input_dir)
return -ENOMEM;
proc_bus_input_dir->owner = THIS_MODULE;
entry = create_proc_read_entry("devices", 0, proc_bus_input_dir, input_devices_read, NULL);
if (!entry)
goto fail1;
entry->owner = THIS_MODULE;
input_fileops = *entry->proc_fops;
entry->proc_fops = &input_fileops;
entry->proc_fops->poll = input_devices_poll;
entry = create_proc_read_entry("handlers", 0, proc_bus_input_dir, input_handlers_read, NULL);
if (!entry)
goto fail2;
entry->owner = THIS_MODULE;
return 0;
fail2: remove_proc_entry("devices", proc_bus_input_dir);
fail1: remove_proc_entry("input", proc_bus);
return -ENOMEM;
}
static void input_proc_exit(void)
{
remove_proc_entry("devices", proc_bus_input_dir);
remove_proc_entry("handlers", proc_bus_input_dir);
remove_proc_entry("input", proc_bus);
}
#else /* !CONFIG_PROC_FS */
static inline void input_wakeup_procfs_readers(void) { }
static inline int input_proc_init(void) { return 0; }
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 = down_interruptible(&input_dev->sem); \
if (retval) \
return retval; \
\
retval = sprintf(buf, "%s\n", input_dev->name ? input_dev->name : ""); \
\
up(&input_dev->sem); \
\
return retval; \
} \
static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL);
INPUT_DEV_STRING_ATTR_SHOW(name);
INPUT_DEV_STRING_ATTR_SHOW(phys);
INPUT_DEV_STRING_ATTR_SHOW(uniq);
static int print_modalias_bits(char *buf, char prefix, unsigned long *arr,
unsigned int min, unsigned int max)
{
int len, i;
len = sprintf(buf, "%c", prefix);
for (i = min; i < max; i++)
if (arr[LONG(i)] & BIT(i))
len += sprintf(buf+len, "%X,", i);
return len;
}
static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
{
struct input_dev *id = to_input_dev(dev);
ssize_t len = 0;
len += sprintf(buf+len, "input:b%04Xv%04Xp%04Xe%04X-",
id->id.bustype,
id->id.vendor,
id->id.product,
id->id.version);
len += print_modalias_bits(buf+len, 'e', id->evbit, 0, EV_MAX);
len += print_modalias_bits(buf+len, 'k', id->keybit,
KEY_MIN_INTERESTING, KEY_MAX);
len += print_modalias_bits(buf+len, 'r', id->relbit, 0, REL_MAX);
len += print_modalias_bits(buf+len, 'a', id->absbit, 0, ABS_MAX);
len += print_modalias_bits(buf+len, 'm', id->mscbit, 0, MSC_MAX);
len += print_modalias_bits(buf+len, 'l', id->ledbit, 0, LED_MAX);
len += print_modalias_bits(buf+len, 's', id->sndbit, 0, SND_MAX);
len += print_modalias_bits(buf+len, 'f', id->ffbit, 0, FF_MAX);
len += print_modalias_bits(buf+len, 'w', id->swbit, 0, SW_MAX);
len += sprintf(buf+len, "\n");
return len;
}
static CLASS_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,
NULL
};
static struct attribute_group input_dev_attr_group = {
.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 sprintf(buf, "%04x\n", input_dev->id.name); \
} \
static CLASS_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(product);
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,
NULL
};
static struct attribute_group input_dev_id_attr_group = {
.name = "id",
.attrs = input_dev_id_attrs,
};
#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); \
return input_print_bitmap(buf, PAGE_SIZE, input_dev->bm##bit, ev##_MAX);\
} \
static CLASS_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(REL, rel);
INPUT_DEV_CAP_ATTR(ABS, abs);
INPUT_DEV_CAP_ATTR(MSC, msc);
INPUT_DEV_CAP_ATTR(LED, led);
INPUT_DEV_CAP_ATTR(SND, snd);
INPUT_DEV_CAP_ATTR(FF, ff);
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,
NULL
};
static struct attribute_group input_dev_caps_attr_group = {
.name = "capabilities",
.attrs = input_dev_caps_attrs,
};
static void input_dev_release(struct class_device *class_dev)
{
struct input_dev *dev = to_input_dev(class_dev);
kfree(dev);
module_put(THIS_MODULE);
}
/*
* 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,
const char *name, unsigned long *bitmap, int max)
{
if (*cur_index >= num_envp - 1)
return -ENOMEM;
envp[*cur_index] = buffer + *cur_len;
*cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
if (*cur_len > buffer_size)
return -ENOMEM;
*cur_len += input_print_bitmap(buffer + *cur_len,
max(buffer_size - *cur_len, 0),
bitmap, max) + 1;
if (*cur_len > buffer_size)
return -ENOMEM;
(*cur_index)++;
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); \
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); \
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)
{
struct input_dev *dev = to_input_dev(cdev);
int i = 0;
int len = 0;
INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
dev->id.bustype, dev->id.vendor,
dev->id.product, dev->id.version);
if (dev->name)
INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
if (dev->phys)
INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
if (dev->uniq)
INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
if (test_bit(EV_KEY, dev->evbit))
INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
if (test_bit(EV_REL, dev->evbit))
INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
if (test_bit(EV_ABS, dev->evbit))
INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
if (test_bit(EV_MSC, dev->evbit))
INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
if (test_bit(EV_LED, dev->evbit))
INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
if (test_bit(EV_SND, dev->evbit))
INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
if (test_bit(EV_FF, dev->evbit))
INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
if (test_bit(EV_SW, dev->evbit))
INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
envp[i] = NULL;
return 0;
}
struct class input_class = {
.name = "input",
.release = input_dev_release,
.uevent = input_dev_uevent,
};
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);
INIT_LIST_HEAD(&dev->h_list);
INIT_LIST_HEAD(&dev->node);
}
return dev;
}
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;
}
init_MUTEX(&dev->sem);
set_bit(EV_SYN, dev->evbit);
/*
* 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;
dev->timer.function = input_repeat_key;
dev->rep[REP_DELAY] = 250;
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);
error = class_device_add(&dev->cdev);
if (error)
return error;
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;
error = sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
if (error)
goto fail3;
__module_get(THIS_MODULE);
path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
printk(KERN_INFO "input: %s as %s\n",
dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
kfree(path);
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);
input_wakeup_procfs_readers();
return 0;
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;
}
void input_unregister_device(struct input_dev *dev)
{
struct list_head * node, * next;
if (!dev) return;
del_timer_sync(&dev->timer);
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);
handle->handler->disconnect(handle);
}
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);
class_device_unregister(&dev->cdev);
input_wakeup_procfs_readers();
}
void input_register_handler(struct input_handler *handler)
{
struct input_dev *dev;
struct input_handle *handle;
struct input_device_id *id;
if (!handler) return;
INIT_LIST_HEAD(&handler->h_list);
if (handler->fops != NULL)
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);
input_wakeup_procfs_readers();
}
void input_unregister_handler(struct input_handler *handler)
{
struct list_head * node, * next;
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);
handler->disconnect(handle);
}
list_del_init(&handler->node);
if (handler->fops != NULL)
input_table[handler->minor >> 5] = NULL;
input_wakeup_procfs_readers();
}
static int input_open_file(struct inode *inode, struct file *file)
{
struct input_handler *handler = input_table[iminor(inode) >> 5];
struct file_operations *old_fops, *new_fops = NULL;
int err;
/* No load-on-demand here? */
if (!handler || !(new_fops = fops_get(handler->fops)))
return -ENODEV;
/*
* That's _really_ odd. Usually NULL ->open means "nothing special",
* not "no device". Oh, well...
*/
if (!new_fops->open) {
fops_put(new_fops);
return -ENODEV;
}
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);
return err;
}
static struct file_operations input_fops = {
.owner = THIS_MODULE,
.open = input_open_file,
};
static int __init input_init(void)
{
int err;
err = class_register(&input_class);
if (err) {
printk(KERN_ERR "input: unable to register input_dev class\n");
return err;
}
err = input_proc_init();
if (err)
goto fail1;
err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
if (err) {
printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
goto fail2;
}
return 0;
fail2: input_proc_exit();
fail1: class_unregister(&input_class);
return err;
}
static void __exit input_exit(void)
{
input_proc_exit();
unregister_chrdev(INPUT_MAJOR, "input");
class_unregister(&input_class);
}
subsys_initcall(input_init);
module_exit(input_exit);