X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=drivers%2Finput%2Finput.c;h=e828aab7daceada9eb8858fb19fa3fc755baa7ea;hb=f552ce5fc2df5504f2feb0087e8a3e61b694ad67;hp=de2e7546b491a8878da0677fc40694ec4ba99b3e;hpb=ca56fe07f46e1c174b544e714be183f1476fecea;p=safe%2Fjmp%2Flinux-2.6 diff --git a/drivers/input/input.c b/drivers/input/input.c index de2e754..e828aab 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -11,18 +11,18 @@ */ #include -#include -#include +#include #include #include #include #include #include #include -#include #include #include #include +#include +#include MODULE_AUTHOR("Vojtech Pavlik "); MODULE_DESCRIPTION("Input core"); @@ -30,261 +30,674 @@ MODULE_LICENSE("GPL"); #define INPUT_DEVICES 256 +/* + * EV_ABS events which should not be cached are listed here. + */ +static unsigned int input_abs_bypass_init_data[] __initdata = { + ABS_MT_TOUCH_MAJOR, + ABS_MT_TOUCH_MINOR, + ABS_MT_WIDTH_MAJOR, + ABS_MT_WIDTH_MINOR, + ABS_MT_ORIENTATION, + ABS_MT_POSITION_X, + ABS_MT_POSITION_Y, + ABS_MT_TOOL_TYPE, + ABS_MT_BLOB_ID, + ABS_MT_TRACKING_ID, + 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]; -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); + __change_bit(code, dev->snd); + disposition = INPUT_PASS_TO_ALL; + } + break; - if (dev->event) - dev->event(dev, type, code, value); - - 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: - if (dev->event) - dev->event(dev, type, code, value); - break; - } +void input_event(struct input_dev *dev, + unsigned int type, unsigned int code, int value) +{ + unsigned long flags; - if (type != EV_SYN) - dev->sync = 0; + if (is_event_supported(type, dev->evbit, EV_MAX)) { - 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); + 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); + } } EXPORT_SYMBOL(input_event); -static void input_repeat_key(unsigned long data) +/** + * input_inject_event() - send input event from input handler + * @handle: input handle to send event through + * @type: type of the 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. + */ +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); -int input_accept_process(struct input_handle *handle, struct file *file) +/** + * 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->accept) - return handle->dev->accept(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->grab) { + retval = -EBUSY; + goto out; + } + + rcu_assign_pointer(dev->grab, handle); + synchronize_rcu(); + + out: + mutex_unlock(&dev->mutex); + return retval; } -EXPORT_SYMBOL(input_accept_process); +EXPORT_SYMBOL(input_grab_device); -int input_grab_device(struct input_handle *handle) +static void __input_release_device(struct input_handle *handle) { - if (handle->dev->grab) - return -EBUSY; + struct input_dev *dev = handle->dev; - handle->dev->grab = handle; - return 0; + if (dev->grab == handle) { + 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->open && handle->handler->start) + handle->handler->start(handle); + } } -EXPORT_SYMBOL(input_grab_device); +/** + * 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) { - if (handle->dev->grab == handle) - handle->dev->grab = NULL; + 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) +{ + 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) { - list_add_tail(&handle->d_node, &handle->dev->h_list); - list_add_tail(&handle->h_node, &handle->handler->h_list); + 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; @@ -322,6 +735,29 @@ static struct input_device_id *input_match_device(struct input_device_id *id, st 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; @@ -336,51 +772,31 @@ static inline void input_wakeup_procfs_readers(void) 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; -} - -static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos) -{ - if (element->next == list) - return NULL; - - ++(*pos); - return element->next; -} - 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... */ + if (mutex_lock_interruptible(&input_mutex)) + return NULL; - return list_get_nth_element(&input_dev_list, pos); + 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) { - /* release lock here */ + mutex_unlock(&input_mutex); } static void input_seq_print_bitmap(struct seq_file *seq, const char *name, @@ -388,7 +804,7 @@ 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; @@ -401,7 +817,7 @@ static void input_seq_print_bitmap(struct seq_file *seq, const char *name, 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", @@ -410,6 +826,7 @@ static int input_devices_seq_show(struct seq_file *seq, void *v) 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) @@ -440,7 +857,7 @@ static int input_devices_seq_show(struct seq_file *seq, void *v) 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, @@ -452,7 +869,7 @@ static int input_proc_devices_open(struct inode *inode, struct file *file) 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, @@ -463,20 +880,22 @@ static struct file_operations input_devices_fileops = { 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... */ + if (mutex_lock_interruptible(&input_mutex)) + return NULL; + seq->private = (void *)(unsigned long)*pos; - return list_get_nth_element(&input_handler_list, 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); + return seq_list_next(v, &input_handler_list, pos); } static void input_handlers_seq_stop(struct seq_file *seq, void *v) { - /* release lock here */ + mutex_unlock(&input_mutex); } static int input_handlers_seq_show(struct seq_file *seq, void *v) @@ -491,7 +910,7 @@ static int input_handlers_seq_show(struct seq_file *seq, void *v) 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, @@ -503,7 +922,7 @@ static int input_proc_handlers_open(struct inode *inode, struct file *file) 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, @@ -515,30 +934,24 @@ static int __init input_proc_init(void) { 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; } @@ -546,7 +959,7 @@ 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); + remove_proc_entry("bus/input", NULL); } #else /* !CONFIG_PROC_FS */ @@ -555,24 +968,17 @@ 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 = 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); @@ -586,7 +992,7 @@ static int input_print_modalias_bits(char *buf, int size, 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; } @@ -626,7 +1032,9 @@ static int input_print_modalias(char *buf, int size, struct input_dev *id, 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; @@ -635,13 +1043,13 @@ static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf) 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 }; @@ -649,13 +1057,15 @@ 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 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); @@ -663,10 +1073,10 @@ 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, + &dev_attr_bustype.attr, + &dev_attr_vendor.attr, + &dev_attr_product.attr, + &dev_attr_version.attr, NULL }; @@ -681,7 +1091,7 @@ static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, 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; @@ -695,15 +1105,17 @@ static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, 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); @@ -716,15 +1128,15 @@ 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, + &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 }; @@ -733,11 +1145,20 @@ static struct attribute_group input_dev_caps_attr_group = { .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); + module_put(THIS_MODULE); } @@ -745,87 +1166,66 @@ static void input_dev_release(struct class_device *class_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, @@ -857,65 +1257,218 @@ static int input_dev_uevent(struct class_device *cdev, char **envp, INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); - envp[i] = NULL; return 0; } +#define INPUT_DO_TOGGLE(dev, type, bits, on) \ + do { \ + int i; \ + if (!test_bit(EV_##type, dev->evbit)) \ + break; \ + for (i = 0; i < type##_MAX; i++) { \ + if (!test_bit(i, dev->bits##bit) || \ + !test_bit(i, dev->bits)) \ + continue; \ + dev->event(dev, EV_##type, i, on); \ + } \ + } while (0) + +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]); + } +} + +#ifdef CONFIG_PM +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 : ""); - 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 @@ -930,120 +1483,129 @@ int input_register_device(struct input_dev *dev) 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; + if (!dev->getkeycode) + dev->getkeycode = input_default_getkeycode; - error = sysfs_create_group(&dev->cdev.kobj, &input_dev_attr_group); - if (error) - goto fail1; + if (!dev->setkeycode) + dev->setkeycode = input_default_setkeycode; - 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); + 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); - class_device_unregister(&dev->cdev); + input_wakeup_procfs_readers(); - mutex_lock(&dev->mutex); - dev->name = dev->phys = dev->uniq = NULL; - mutex_unlock(&dev->mutex); + 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); + 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; - 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); + mutex_lock(&input_mutex); + + 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); @@ -1051,18 +1613,92 @@ void input_unregister_handler(struct input_handler *handler) input_table[handler->minor >> 5] = NULL; input_wakeup_procfs_readers(); + + mutex_unlock(&input_mutex); } EXPORT_SYMBOL(input_unregister_handler); +/** + * 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(&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_init(&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", @@ -1070,7 +1706,8 @@ static int input_open_file(struct inode *inode, struct file *file) */ if (!new_fops->open) { fops_put(new_fops); - return -ENODEV; + err = -ENODEV; + goto out; } old_fops = file->f_op; file->f_op = new_fops; @@ -1082,18 +1719,30 @@ static int input_open_file(struct inode *inode, struct file *file) 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");