a7y18lte-ubports/android_kernel_samsung_universal7885
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Input: joydev - implement proper locking

Browse Source 
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov 2007-08-30 00:22:32 -04:00
parent 464b241575
commit b126207ccd
1 changed files with 492 additions and 251 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

513
drivers/input/joydev.c
View File

@ -43,6 +43,8 @@ struct joydev {
struct input_handle handle; struct input_handle handle;
wait_queue_head_t wait; wait_queue_head_t wait;
struct list_head client_list; struct list_head client_list;
spinlock_t client_lock; /* protects client_list */
struct mutex mutex;
struct device dev; struct device dev;
struct js_corr corr[ABS_MAX + 1]; struct js_corr corr[ABS_MAX + 1];
@ -61,23 +63,28 @@ struct joydev_client {
int head; int head;
int tail; int tail;
int startup; int startup;
spinlock_t buffer_lock; /* protects access to buffer, head and tail */
struct fasync_struct *fasync; struct fasync_struct *fasync;
struct joydev *joydev; struct joydev *joydev;
struct list_head node; struct list_head node;
}; };
static struct joydev *joydev_table[JOYDEV_MINORS]; static struct joydev *joydev_table[JOYDEV_MINORS];
static DEFINE_MUTEX(joydev_table_mutex);
static int joydev_correct(int value, struct js_corr *corr) static int joydev_correct(int value, struct js_corr *corr)
{ {
switch (corr->type) { switch (corr->type) {
case JS_CORR_NONE: case JS_CORR_NONE:
break; break;
case JS_CORR_BROKEN: case JS_CORR_BROKEN:
value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 : value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
((corr->coef[3] * (value - corr->coef[1])) >> 14)) : ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
((corr->coef[2] * (value - corr->coef[0])) >> 14); ((corr->coef[2] * (value - corr->coef[0])) >> 14);
break; break;
default: default:
return 0; return 0;
} }
@ -85,7 +92,32 @@ static int joydev_correct(int value, struct js_corr *corr)
return value < -32767 ? -32767 : (value > 32767 ? 32767 : value); return value < -32767 ? -32767 : (value > 32767 ? 32767 : value);
} }
static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value) static void joydev_pass_event(struct joydev_client *client,
struct js_event *event)
{
struct joydev *joydev = client->joydev;
/*
* IRQs already disabled, just acquire the lock
*/
spin_lock(&client->buffer_lock);
client->buffer[client->head] = *event;
if (client->startup == joydev->nabs + joydev->nkey) {
client->head++;
client->head &= JOYDEV_BUFFER_SIZE - 1;
if (client->tail == client->head)
client->startup = 0;
}
spin_unlock(&client->buffer_lock);
kill_fasync(&client->fasync, SIGIO, POLL_IN);
}
static void joydev_event(struct input_handle *handle,
unsigned int type, unsigned int code, int value)
{ {
struct joydev *joydev = handle->private; struct joydev *joydev = handle->private;
struct joydev_client *client; struct joydev_client *client;
@ -104,7 +136,8 @@ static void joydev_event(struct input_handle *handle, unsigned int type, unsigne
case EV_ABS: case EV_ABS:
event.type = JS_EVENT_AXIS; event.type = JS_EVENT_AXIS;
event.number = joydev->absmap[code]; event.number = joydev->absmap[code];
event.value = joydev_correct(value, joydev->corr + event.number); event.value = joydev_correct(value,
&joydev->corr[event.number]);
if (event.value == joydev->abs[event.number]) if (event.value == joydev->abs[event.number])
return; return;
joydev->abs[event.number] = event.value; joydev->abs[event.number] = event.value;
@ -116,16 +149,8 @@ static void joydev_event(struct input_handle *handle, unsigned int type, unsigne
event.time = jiffies_to_msecs(jiffies); event.time = jiffies_to_msecs(jiffies);
list_for_each_entry(client, &joydev->client_list, node) { list_for_each_entry_rcu(client, &joydev->client_list, node)
joydev_pass_event(client, &event);
memcpy(client->buffer + client->head, &event, sizeof(struct js_event));
if (client->startup == joydev->nabs + joydev->nkey)
if (client->tail == (client->head = (client->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
client->startup = 0;
kill_fasync(&client->fasync, SIGIO, POLL_IN);
}
wake_up_interruptible(&joydev->wait); wake_up_interruptible(&joydev->wait);
} }
@ -144,23 +169,85 @@ static void joydev_free(struct device *dev)
{ {
struct joydev *joydev = container_of(dev, struct joydev, dev); struct joydev *joydev = container_of(dev, struct joydev, dev);
joydev_table[joydev->minor] = NULL;
kfree(joydev); kfree(joydev);
} }
static void joydev_attach_client(struct joydev *joydev,
struct joydev_client *client)
{
spin_lock(&joydev->client_lock);
list_add_tail_rcu(&client->node, &joydev->client_list);
spin_unlock(&joydev->client_lock);
/*
* We don't use synchronize_rcu() here because read-side
* critical section is protected by a spinlock (dev->event_lock)
* instead of rcu_read_lock().
*/
synchronize_sched();
}
static void joydev_detach_client(struct joydev *joydev,
struct joydev_client *client)
{
spin_lock(&joydev->client_lock);
list_del_rcu(&client->node);
spin_unlock(&joydev->client_lock);
synchronize_sched();
}
static int joydev_open_device(struct joydev *joydev)
{
int retval;
retval = mutex_lock_interruptible(&joydev->mutex);
if (retval)
return retval;
if (!joydev->exist)
retval = -ENODEV;
else if (!joydev->open++)
retval = input_open_device(&joydev->handle);
mutex_unlock(&joydev->mutex);
return retval;
}
static void joydev_close_device(struct joydev *joydev)
{
mutex_lock(&joydev->mutex);
if (joydev->exist && !--joydev->open)
input_close_device(&joydev->handle);
mutex_unlock(&joydev->mutex);
}
/*
* Wake up users waiting for IO so they can disconnect from
* dead device.
*/
static void joydev_hangup(struct joydev *joydev)
{
struct joydev_client *client;
spin_lock(&joydev->client_lock);
list_for_each_entry(client, &joydev->client_list, node)
kill_fasync(&client->fasync, SIGIO, POLL_HUP);
spin_unlock(&joydev->client_lock);
wake_up_interruptible(&joydev->wait);
}
static int joydev_release(struct inode *inode, struct file *file) static int joydev_release(struct inode *inode, struct file *file)
{ {
struct joydev_client *client = file->private_data; struct joydev_client *client = file->private_data;
struct joydev *joydev = client->joydev; struct joydev *joydev = client->joydev;
joydev_fasync(-1, file, 0); joydev_fasync(-1, file, 0);
joydev_detach_client(joydev, client);
list_del(&client->node);
kfree(client); kfree(client);
if (!--joydev->open && joydev->exist) joydev_close_device(joydev);
input_close_device(&joydev->handle);
put_device(&joydev->dev); put_device(&joydev->dev);
return 0; return 0;
@ -176,11 +263,16 @@ static int joydev_open(struct inode *inode, struct file *file)
if (i >= JOYDEV_MINORS) if (i >= JOYDEV_MINORS)
return -ENODEV; return -ENODEV;
error = mutex_lock_interruptible(&joydev_table_mutex);
if (error)
return error;
joydev = joydev_table[i]; joydev = joydev_table[i];
if (!joydev || !joydev->exist) if (joydev)
return -ENODEV;
get_device(&joydev->dev); get_device(&joydev->dev);
mutex_unlock(&joydev_table_mutex);
if (!joydev)
return -ENODEV;
client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL); client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
if (!client) { if (!client) {
@ -188,37 +280,129 @@ static int joydev_open(struct inode *inode, struct file *file)
goto err_put_joydev; goto err_put_joydev;
} }
spin_lock_init(&client->buffer_lock);
client->joydev = joydev; client->joydev = joydev;
list_add_tail(&client->node, &joydev->client_list); joydev_attach_client(joydev, client);
if (!joydev->open++ && joydev->exist) { error = joydev_open_device(joydev);
error = input_open_device(&joydev->handle);
if (error) if (error)
goto err_free_client; goto err_free_client;
}
file->private_data = client; file->private_data = client;
return 0; return 0;
err_free_client: err_free_client:
list_del(&client->node); joydev_detach_client(joydev, client);
kfree(client); kfree(client);
err_put_joydev: err_put_joydev:
put_device(&joydev->dev); put_device(&joydev->dev);
return error; return error;
} }
static ssize_t joydev_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) static int joydev_generate_startup_event(struct joydev_client *client,
struct input_dev *input,
struct js_event *event)
{ {
return -EINVAL; struct joydev *joydev = client->joydev;
int have_event;
spin_lock_irq(&client->buffer_lock);
have_event = client->startup < joydev->nabs + joydev->nkey;
if (have_event) {
event->time = jiffies_to_msecs(jiffies);
if (client->startup < joydev->nkey) {
event->type = JS_EVENT_BUTTON | JS_EVENT_INIT;
event->number = client->startup;
event->value = !!test_bit(joydev->keypam[event->number],
input->key);
} else {
event->type = JS_EVENT_AXIS | JS_EVENT_INIT;
event->number = client->startup - joydev->nkey;
event->value = joydev->abs[event->number];
}
client->startup++;
} }
static ssize_t joydev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) spin_unlock_irq(&client->buffer_lock);
return have_event;
}
static int joydev_fetch_next_event(struct joydev_client *client,
struct js_event *event)
{
int have_event;
spin_lock_irq(&client->buffer_lock);
have_event = client->head != client->tail;
if (have_event) {
*event = client->buffer[client->tail++];
client->tail &= JOYDEV_BUFFER_SIZE - 1;
}
spin_unlock_irq(&client->buffer_lock);
return have_event;
}
/*
* Old joystick interface
*/
static ssize_t joydev_0x_read(struct joydev_client *client,
struct input_dev *input,
char __user *buf)
{
struct joydev *joydev = client->joydev;
struct JS_DATA_TYPE data;
int i;
spin_lock_irq(&input->event_lock);
/*
* Get device state
*/
for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
data.buttons |=
test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
/*
* Reset reader's event queue
*/
spin_lock(&client->buffer_lock);
client->startup = 0;
client->tail = client->head;
spin_unlock(&client->buffer_lock);
spin_unlock_irq(&input->event_lock);
if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
return -EFAULT;
return sizeof(struct JS_DATA_TYPE);
}
static inline int joydev_data_pending(struct joydev_client *client)
{
struct joydev *joydev = client->joydev;
return client->startup < joydev->nabs + joydev->nkey ||
client->head != client->tail;
}
static ssize_t joydev_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{ {
struct joydev_client *client = file->private_data; struct joydev_client *client = file->private_data;
struct joydev *joydev = client->joydev; struct joydev *joydev = client->joydev;
struct input_dev *input = joydev->handle.dev; struct input_dev *input = joydev->handle.dev;
int retval = 0; struct js_event event;
int retval;
if (!joydev->exist) if (!joydev->exist)
return -ENODEV; return -ENODEV;
@ -226,68 +410,35 @@ static ssize_t joydev_read(struct file *file, char __user *buf, size_t count, lo
if (count < sizeof(struct js_event)) if (count < sizeof(struct js_event))
return -EINVAL; return -EINVAL;
if (count == sizeof(struct JS_DATA_TYPE)) { if (count == sizeof(struct JS_DATA_TYPE))
return joydev_0x_read(client, input, buf);
struct JS_DATA_TYPE data; if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK))
int i;
for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
data.buttons |= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
return -EFAULT;
client->startup = 0;
client->tail = client->head;
return sizeof(struct JS_DATA_TYPE);
}
if (client->startup == joydev->nabs + joydev->nkey &&
client->head == client->tail && (file->f_flags & O_NONBLOCK))
return -EAGAIN; return -EAGAIN;
retval = wait_event_interruptible(joydev->wait, retval = wait_event_interruptible(joydev->wait,
!joydev->exist || !joydev->exist || joydev_data_pending(client));
client->startup < joydev->nabs + joydev->nkey ||
client->head != client->tail);
if (retval) if (retval)
return retval; return retval;
if (!joydev->exist) if (!joydev->exist)
return -ENODEV; return -ENODEV;
while (client->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) { while (retval + sizeof(struct js_event) <= count &&
joydev_generate_startup_event(client, input, &event)) {
struct js_event event;
event.time = jiffies_to_msecs(jiffies);
if (client->startup < joydev->nkey) {
event.type = JS_EVENT_BUTTON | JS_EVENT_INIT;
event.number = client->startup;
event.value = !!test_bit(joydev->keypam[event.number], input->key);
} else {
event.type = JS_EVENT_AXIS | JS_EVENT_INIT;
event.number = client->startup - joydev->nkey;
event.value = joydev->abs[event.number];
}
if (copy_to_user(buf + retval, &event, sizeof(struct js_event))) if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
return -EFAULT; return -EFAULT;
client->startup++;
retval += sizeof(struct js_event); retval += sizeof(struct js_event);
} }
while (client->head != client->tail && retval + sizeof(struct js_event) <= count) { while (retval + sizeof(struct js_event) <= count &&
joydev_fetch_next_event(client, &event)) {
if (copy_to_user(buf + retval, client->buffer + client->tail, sizeof(struct js_event))) if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
return -EFAULT; return -EFAULT;
client->tail = (client->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
retval += sizeof(struct js_event); retval += sizeof(struct js_event);
} }
@ -301,11 +452,12 @@ static unsigned int joydev_poll(struct file *file, poll_table *wait)
struct joydev *joydev = client->joydev; struct joydev *joydev = client->joydev;
poll_wait(file, &joydev->wait, wait); poll_wait(file, &joydev->wait, wait);
return ((client->head != client->tail || client->startup < joydev->nabs + joydev->nkey) ? return (joydev_data_pending(client) ? (POLLIN | POLLRDNORM) : 0) |
(POLLIN | POLLRDNORM) : 0) | (joydev->exist ? 0 : (POLLHUP | POLLERR)); (joydev->exist ? 0 : (POLLHUP | POLLERR));
} }
static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __user *argp) static int joydev_ioctl_common(struct joydev *joydev,
unsigned int cmd, void __user *argp)
{ {
struct input_dev *dev = joydev->handle.dev; struct input_dev *dev = joydev->handle.dev;
int i, j; int i, j;
@ -339,9 +491,11 @@ static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __u
if (copy_from_user(joydev->corr, argp, if (copy_from_user(joydev->corr, argp,
sizeof(joydev->corr[0]) * joydev->nabs)) sizeof(joydev->corr[0]) * joydev->nabs))
return -EFAULT; return -EFAULT;
for (i = 0; i < joydev->nabs; i++) { for (i = 0; i < joydev->nabs; i++) {
j = joydev->abspam[i]; j = joydev->abspam[i];
joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i); joydev->abs[i] = joydev_correct(dev->abs[j],
&joydev->corr[i]);
} }
return 0; return 0;
@ -350,8 +504,10 @@ static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __u
sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0; sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
case JSIOCSAXMAP: case JSIOCSAXMAP:
if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1))) if (copy_from_user(joydev->abspam, argp,
sizeof(__u8) * (ABS_MAX + 1)))
return -EFAULT; return -EFAULT;
for (i = 0; i < joydev->nabs; i++) { for (i = 0; i < joydev->nabs; i++) {
if (joydev->abspam[i] > ABS_MAX) if (joydev->abspam[i] > ABS_MAX)
return -EINVAL; return -EINVAL;
@ -364,13 +520,17 @@ static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __u
sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0; sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;
case JSIOCSBTNMAP: case JSIOCSBTNMAP:
if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1))) if (copy_from_user(joydev->keypam, argp,
sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
return -EFAULT; return -EFAULT;
for (i = 0; i < joydev->nkey; i++) { for (i = 0; i < joydev->nkey; i++) {
if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC) if (joydev->keypam[i] > KEY_MAX ||
joydev->keypam[i] < BTN_MISC)
return -EINVAL; return -EINVAL;
joydev->keymap[joydev->keypam[i] - BTN_MISC] = i; joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
} }
return 0; return 0;
case JSIOCGBTNMAP: case JSIOCGBTNMAP:
@ -378,7 +538,7 @@ static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __u
sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0; sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;
default: default:
if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) { if ((cmd & ~IOCSIZE_MASK) == JSIOCGNAME(0)) {
int len; int len;
if (!dev->name) if (!dev->name)
return 0; return 0;
@ -394,33 +554,42 @@ static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __u
} }
#ifdef CONFIG_COMPAT #ifdef CONFIG_COMPAT
static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) static long joydev_compat_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{ {
struct joydev_client *client = file->private_data; struct joydev_client *client = file->private_data;
struct joydev *joydev = client->joydev; struct joydev *joydev = client->joydev;
void __user *argp = (void __user *)arg; void __user *argp = (void __user *)arg;
s32 tmp32; s32 tmp32;
struct JS_DATA_SAVE_TYPE_32 ds32; struct JS_DATA_SAVE_TYPE_32 ds32;
int err; int retval;
if (!joydev->exist) retval = mutex_lock_interruptible(&joydev->mutex);
return -ENODEV; if (retval)
return retval;
if (!joydev->exist) {
retval = -ENODEV;
goto out;
}
switch (cmd) { switch (cmd) {
case JS_SET_TIMELIMIT: case JS_SET_TIMELIMIT:
err = get_user(tmp32, (s32 __user *) arg); retval = get_user(tmp32, (s32 __user *) arg);
if (err == 0) if (retval == 0)
joydev->glue.JS_TIMELIMIT = tmp32; joydev->glue.JS_TIMELIMIT = tmp32;
break; break;
case JS_GET_TIMELIMIT: case JS_GET_TIMELIMIT:
tmp32 = joydev->glue.JS_TIMELIMIT; tmp32 = joydev->glue.JS_TIMELIMIT;
err = put_user(tmp32, (s32 __user *) arg); retval = put_user(tmp32, (s32 __user *) arg);
break; break;
case JS_SET_ALL: case JS_SET_ALL:
err = copy_from_user(&ds32, argp, retval = copy_from_user(&ds32, argp,
sizeof(ds32)) ? -EFAULT : 0; sizeof(ds32)) ? -EFAULT : 0;
if (err == 0) { if (retval == 0) {
joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT; joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT;
joydev->glue.BUSY = ds32.BUSY; joydev->glue.BUSY = ds32.BUSY;
joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME; joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
@ -438,55 +607,119 @@ static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned lo
ds32.JS_SAVE = joydev->glue.JS_SAVE; ds32.JS_SAVE = joydev->glue.JS_SAVE;
ds32.JS_CORR = joydev->glue.JS_CORR; ds32.JS_CORR = joydev->glue.JS_CORR;
err = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0; retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
break; break;
default: default:
err = joydev_ioctl_common(joydev, cmd, argp); retval = joydev_ioctl_common(joydev, cmd, argp);
break;
} }
return err;
out:
mutex_unlock(&joydev->mutex);
return retval;
} }
#endif /* CONFIG_COMPAT */ #endif /* CONFIG_COMPAT */
static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) static long joydev_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{ {
struct joydev_client *client = file->private_data; struct joydev_client *client = file->private_data;
struct joydev *joydev = client->joydev; struct joydev *joydev = client->joydev;
void __user *argp = (void __user *)arg; void __user *argp = (void __user *)arg;
int retval;
if (!joydev->exist) retval = mutex_lock_interruptible(&joydev->mutex);
return -ENODEV; if (retval)
return retval;
if (!joydev->exist) {
retval = -ENODEV;
goto out;
}
switch (cmd) { switch (cmd) {
case JS_SET_TIMELIMIT: case JS_SET_TIMELIMIT:
return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg); retval = get_user(joydev->glue.JS_TIMELIMIT,
(long __user *) arg);
break;
case JS_GET_TIMELIMIT: case JS_GET_TIMELIMIT:
return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg); retval = put_user(joydev->glue.JS_TIMELIMIT,
(long __user *) arg);
break;
case JS_SET_ALL: case JS_SET_ALL:
return copy_from_user(&joydev->glue, argp, retval = copy_from_user(&joydev->glue, argp,
sizeof(joydev->glue)) ? -EFAULT: 0; sizeof(joydev->glue)) ? -EFAULT: 0;
break;
case JS_GET_ALL: case JS_GET_ALL:
return copy_to_user(argp, &joydev->glue, retval = copy_to_user(argp, &joydev->glue,
sizeof(joydev->glue)) ? -EFAULT : 0; sizeof(joydev->glue)) ? -EFAULT : 0;
break;
default: default:
return joydev_ioctl_common(joydev, cmd, argp); retval = joydev_ioctl_common(joydev, cmd, argp);
break;
} }
out:
mutex_unlock(&joydev->mutex);
return retval;
} }
static const struct file_operations joydev_fops = { static const struct file_operations joydev_fops = {
.owner = THIS_MODULE, .owner = THIS_MODULE,
.read = joydev_read, .read = joydev_read,
.write = joydev_write,
.poll = joydev_poll, .poll = joydev_poll,
.open = joydev_open, .open = joydev_open,
.release = joydev_release, .release = joydev_release,
.ioctl = joydev_ioctl, .unlocked_ioctl = joydev_ioctl,
#ifdef CONFIG_COMPAT #ifdef CONFIG_COMPAT
.compat_ioctl = joydev_compat_ioctl, .compat_ioctl = joydev_compat_ioctl,
#endif #endif
.fasync = joydev_fasync, .fasync = joydev_fasync,
}; };
static int joydev_install_chrdev(struct joydev *joydev)
{
joydev_table[joydev->minor] = joydev;
return 0;
}
static void joydev_remove_chrdev(struct joydev *joydev)
{
mutex_lock(&joydev_table_mutex);
joydev_table[joydev->minor] = NULL;
mutex_unlock(&joydev_table_mutex);
}
/*
* Mark device non-existant. This disables writes, ioctls and
* prevents new users from opening the device. Already posted
* blocking reads will stay, however new ones will fail.
*/
static void joydev_mark_dead(struct joydev *joydev)
{
mutex_lock(&joydev->mutex);
joydev->exist = 0;
mutex_unlock(&joydev->mutex);
}
static void joydev_cleanup(struct joydev *joydev)
{
struct input_handle *handle = &joydev->handle;
joydev_mark_dead(joydev);
joydev_hangup(joydev);
joydev_remove_chrdev(joydev);
/* joydev is marked dead so noone else accesses joydev->open */
if (joydev->open)
input_close_device(handle);
}
static int joydev_connect(struct input_handler *handler, struct input_dev *dev, static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
const struct input_device_id *id) const struct input_device_id *id)
{ {
@ -494,7 +727,10 @@ static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
int i, j, t, minor; int i, j, t, minor;
int error; int error;
for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++); for (minor = 0; minor < JOYDEV_MINORS; minor++)
if (!joydev_table[minor])
break;
if (minor == JOYDEV_MINORS) { if (minor == JOYDEV_MINORS) {
printk(KERN_ERR "joydev: no more free joydev devices\n"); printk(KERN_ERR "joydev: no more free joydev devices\n");
return -ENFILE; return -ENFILE;
@ -505,15 +741,19 @@ static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
return -ENOMEM; return -ENOMEM;
INIT_LIST_HEAD(&joydev->client_list); INIT_LIST_HEAD(&joydev->client_list);
spin_lock_init(&joydev->client_lock);
mutex_init(&joydev->mutex);
init_waitqueue_head(&joydev->wait); init_waitqueue_head(&joydev->wait);
snprintf(joydev->name, sizeof(joydev->name), "js%d", minor);
joydev->exist = 1;
joydev->minor = minor; joydev->minor = minor;
joydev->exist = 1; joydev->exist = 1;
joydev->handle.dev = dev; joydev->handle.dev = dev;
joydev->handle.name = joydev->name; joydev->handle.name = joydev->name;
joydev->handle.handler = handler; joydev->handle.handler = handler;
joydev->handle.private = joydev; joydev->handle.private = joydev;
snprintf(joydev->name, sizeof(joydev->name), "js%d", minor);
for (i = 0; i < ABS_MAX + 1; i++) for (i = 0; i < ABS_MAX + 1; i++)
if (test_bit(i, dev->absbit)) { if (test_bit(i, dev->absbit)) {
@ -545,67 +785,65 @@ static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
} }
joydev->corr[i].type = JS_CORR_BROKEN; joydev->corr[i].type = JS_CORR_BROKEN;
joydev->corr[i].prec = dev->absfuzz[j]; joydev->corr[i].prec = dev->absfuzz[j];
joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j]; joydev->corr[i].coef[0] =
joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j]; (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j]))) joydev->corr[i].coef[1] =
continue; (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
t = (dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j];
if (t) {
joydev->corr[i].coef[2] = (1 << 29) / t; joydev->corr[i].coef[2] = (1 << 29) / t;
joydev->corr[i].coef[3] = (1 << 29) / t; joydev->corr[i].coef[3] = (1 << 29) / t;
joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i); joydev->abs[i] = joydev_correct(dev->abs[j],
joydev->corr + i);
}
} }
snprintf(joydev->dev.bus_id, sizeof(joydev->dev.bus_id), strlcpy(joydev->dev.bus_id, joydev->name, sizeof(joydev->dev.bus_id));
"js%d", minor); joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor);
joydev->dev.class = &input_class; joydev->dev.class = &input_class;
joydev->dev.parent = &dev->dev; joydev->dev.parent = &dev->dev;
joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor);
joydev->dev.release = joydev_free; joydev->dev.release = joydev_free;
device_initialize(&joydev->dev); device_initialize(&joydev->dev);
joydev_table[minor] = joydev; error = input_register_handle(&joydev->handle);
error = device_add(&joydev->dev);
if (error) if (error)
goto err_free_joydev; goto err_free_joydev;
error = input_register_handle(&joydev->handle); error = joydev_install_chrdev(joydev);
if (error) if (error)
goto err_delete_joydev; goto err_unregister_handle;
error = device_add(&joydev->dev);
if (error)
goto err_cleanup_joydev;
return 0; return 0;
err_delete_joydev: err_cleanup_joydev:
device_del(&joydev->dev); joydev_cleanup(joydev);
err_unregister_handle:
input_unregister_handle(&joydev->handle);
err_free_joydev: err_free_joydev:
put_device(&joydev->dev); put_device(&joydev->dev);
return error; return error;
} }
static void joydev_disconnect(struct input_handle *handle) static void joydev_disconnect(struct input_handle *handle)
{ {
struct joydev *joydev = handle->private; struct joydev *joydev = handle->private;
struct joydev_client *client;
input_unregister_handle(handle);
device_del(&joydev->dev); device_del(&joydev->dev);
joydev_cleanup(joydev);
joydev->exist = 0; input_unregister_handle(handle);
if (joydev->open) {
input_close_device(handle);
list_for_each_entry(client, &joydev->client_list, node)
kill_fasync(&client->fasync, SIGIO, POLL_HUP);
wake_up_interruptible(&joydev->wait);
}
put_device(&joydev->dev); put_device(&joydev->dev);
} }
static const struct input_device_id joydev_blacklist[] = { static const struct input_device_id joydev_blacklist[] = {
{ {
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT, .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
INPUT_DEVICE_ID_MATCH_KEYBIT,
.evbit = { BIT(EV_KEY) }, .evbit = { BIT(EV_KEY) },
.keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) }, .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
}, /* Avoid itouchpads, touchscreens and tablets */ }, /* Avoid itouchpads, touchscreens and tablets */
@ -614,17 +852,20 @@ static const struct input_device_id joydev_blacklist[] = {
static const struct input_device_id joydev_ids[] = { static const struct input_device_id joydev_ids[] = {
{ {
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
INPUT_DEVICE_ID_MATCH_ABSBIT,
.evbit = { BIT(EV_ABS) }, .evbit = { BIT(EV_ABS) },
.absbit = { BIT(ABS_X) }, .absbit = { BIT(ABS_X) },
}, },
{ {
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
INPUT_DEVICE_ID_MATCH_ABSBIT,
.evbit = { BIT(EV_ABS) }, .evbit = { BIT(EV_ABS) },
.absbit = { BIT(ABS_WHEEL) }, .absbit = { BIT(ABS_WHEEL) },
}, },
{ {
.flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
INPUT_DEVICE_ID_MATCH_ABSBIT,
.evbit = { BIT(EV_ABS) }, .evbit = { BIT(EV_ABS) },
.absbit = { BIT(ABS_THROTTLE) }, .absbit = { BIT(ABS_THROTTLE) },
}, },