diff options
Diffstat (limited to 'drivers/input/input.c')
| -rw-r--r-- | drivers/input/input.c | 2429 |
1 files changed, 1973 insertions, 456 deletions
diff --git a/drivers/input/input.c b/drivers/input/input.c index 1a1654caedd..29ca0bb4f56 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -10,327 +10,1029 @@ * the Free Software Foundation. */ +#define pr_fmt(fmt) KBUILD_BASENAME ": " fmt + #include <linux/init.h> -#include <linux/sched.h> -#include <linux/smp_lock.h> -#include <linux/input.h> +#include <linux/types.h> +#include <linux/idr.h> +#include <linux/input/mt.h> #include <linux/module.h> +#include <linux/slab.h> #include <linux/random.h> #include <linux/major.h> #include <linux/proc_fs.h> -#include <linux/kobject_uevent.h> -#include <linux/interrupt.h> +#include <linux/sched.h> +#include <linux/seq_file.h> #include <linux/poll.h> #include <linux/device.h> +#include <linux/mutex.h> +#include <linux/rcupdate.h> +#include "input-compat.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 +#define INPUT_MAX_CHAR_DEVICES 1024 +#define INPUT_FIRST_DYNAMIC_DEV 256 +static DEFINE_IDA(input_ida); static LIST_HEAD(input_dev_list); static LIST_HEAD(input_handler_list); -static struct input_handler *input_table[8]; +/* + * 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 const struct input_value input_value_sync = { EV_SYN, SYN_REPORT, 1 }; + +static inline int is_event_supported(unsigned int code, + unsigned long *bm, unsigned int max) +{ + return code <= max && test_bit(code, bm); +} + +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; + + if (value > old_val - fuzz && value < old_val + fuzz) + return (old_val * 3 + value) / 4; + + if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2) + return (old_val + value) / 2; + } + + return value; +} + +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])); + } +} + +static void input_stop_autorepeat(struct input_dev *dev) +{ + del_timer(&dev->timer); +} + +/* + * Pass event first through all filters and then, if event has not been + * filtered out, through all open handles. This function is called with + * dev->event_lock held and interrupts disabled. + */ +static unsigned int input_to_handler(struct input_handle *handle, + struct input_value *vals, unsigned int count) +{ + struct input_handler *handler = handle->handler; + struct input_value *end = vals; + struct input_value *v; + + for (v = vals; v != vals + count; v++) { + if (handler->filter && + handler->filter(handle, v->type, v->code, v->value)) + continue; + if (end != v) + *end = *v; + end++; + } + + count = end - vals; + if (!count) + return 0; + + if (handler->events) + handler->events(handle, vals, count); + else if (handler->event) + for (v = vals; v != end; v++) + handler->event(handle, v->type, v->code, v->value); + + return count; +} -void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) +/* + * Pass values first through all filters and then, if event has not been + * filtered out, through all open handles. This function is called with + * dev->event_lock held and interrupts disabled. + */ +static void input_pass_values(struct input_dev *dev, + struct input_value *vals, unsigned int count) { struct input_handle *handle; + struct input_value *v; - if (type > EV_MAX || !test_bit(type, dev->evbit)) + if (!count) return; - add_input_randomness(type, code, value); + rcu_read_lock(); - switch (type) { + handle = rcu_dereference(dev->grab); + if (handle) { + count = input_to_handler(handle, vals, count); + } else { + list_for_each_entry_rcu(handle, &dev->h_list, d_node) + if (handle->open) + count = input_to_handler(handle, vals, count); + } - case EV_SYN: - switch (code) { - case SYN_CONFIG: - if (dev->event) dev->event(dev, type, code, value); - break; + rcu_read_unlock(); - case SYN_REPORT: - if (dev->sync) return; - dev->sync = 1; - break; - } + add_input_randomness(vals->type, vals->code, vals->value); + + /* trigger auto repeat for key events */ + for (v = vals; v != vals + count; v++) { + if (v->type == EV_KEY && v->value != 2) { + if (v->value) + input_start_autorepeat(dev, v->code); + else + input_stop_autorepeat(dev); + } + } +} + +static void input_pass_event(struct input_dev *dev, + unsigned int type, unsigned int code, int value) +{ + struct input_value vals[] = { { type, code, value } }; + + input_pass_values(dev, vals, ARRAY_SIZE(vals)); +} + +/* + * 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; + + spin_lock_irqsave(&dev->event_lock, flags); + + if (test_bit(dev->repeat_key, dev->key) && + is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) { + struct input_value vals[] = { + { EV_KEY, dev->repeat_key, 2 }, + input_value_sync + }; + + input_pass_values(dev, vals, ARRAY_SIZE(vals)); + + if (dev->rep[REP_PERIOD]) + mod_timer(&dev->timer, jiffies + + msecs_to_jiffies(dev->rep[REP_PERIOD])); + } + + spin_unlock_irqrestore(&dev->event_lock, flags); +} + +#define INPUT_IGNORE_EVENT 0 +#define INPUT_PASS_TO_HANDLERS 1 +#define INPUT_PASS_TO_DEVICE 2 +#define INPUT_SLOT 4 +#define INPUT_FLUSH 8 +#define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE) + +static int input_handle_abs_event(struct input_dev *dev, + unsigned int code, int *pval) +{ + struct input_mt *mt = dev->mt; + bool is_mt_event; + int *pold; + + if (code == ABS_MT_SLOT) { + /* + * "Stage" the event; we'll flush it later, when we + * get actual touch data. + */ + if (mt && *pval >= 0 && *pval < mt->num_slots) + mt->slot = *pval; + + return INPUT_IGNORE_EVENT; + } + + is_mt_event = input_is_mt_value(code); + + if (!is_mt_event) { + pold = &dev->absinfo[code].value; + } else if (mt) { + pold = &mt->slots[mt->slot].abs[code - ABS_MT_FIRST]; + } else { + /* + * Bypass filtering for multi-touch events when + * not employing slots. + */ + pold = NULL; + } + + if (pold) { + *pval = input_defuzz_abs_event(*pval, *pold, + dev->absinfo[code].fuzz); + if (*pold == *pval) + return INPUT_IGNORE_EVENT; + + *pold = *pval; + } + + /* Flush pending "slot" event */ + if (is_mt_event && mt && mt->slot != input_abs_get_val(dev, ABS_MT_SLOT)) { + input_abs_set_val(dev, ABS_MT_SLOT, mt->slot); + return INPUT_PASS_TO_HANDLERS | INPUT_SLOT; + } + + return INPUT_PASS_TO_HANDLERS; +} + +static int input_get_disposition(struct input_dev *dev, + unsigned int type, unsigned int code, int *pval) +{ + int disposition = INPUT_IGNORE_EVENT; + int value = *pval; + + switch (type) { + + case EV_SYN: + switch (code) { + case SYN_CONFIG: + disposition = INPUT_PASS_TO_ALL; break; - case EV_KEY: + case SYN_REPORT: + disposition = INPUT_PASS_TO_HANDLERS | INPUT_FLUSH; + break; + case SYN_MT_REPORT: + disposition = INPUT_PASS_TO_HANDLERS; + break; + } + break; - if (code > KEY_MAX || !test_bit(code, dev->keybit) || !!test_bit(code, dev->key) == value) - return; + case EV_KEY: + if (is_event_supported(code, dev->keybit, KEY_MAX)) { - if (value == 2) + /* auto-repeat bypasses state updates */ + if (value == 2) { + disposition = INPUT_PASS_TO_HANDLERS; break; + } - change_bit(code, dev->key); + if (!!test_bit(code, dev->key) != !!value) { - 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])); + __change_bit(code, dev->key); + disposition = INPUT_PASS_TO_HANDLERS; } + } + break; - break; + case EV_SW: + if (is_event_supported(code, dev->swbit, SW_MAX) && + !!test_bit(code, dev->sw) != !!value) { - case EV_SW: + __change_bit(code, dev->sw); + disposition = INPUT_PASS_TO_HANDLERS; + } + break; - if (code > SW_MAX || !test_bit(code, dev->swbit) || !!test_bit(code, dev->sw) == value) - return; + case EV_ABS: + if (is_event_supported(code, dev->absbit, ABS_MAX)) + disposition = input_handle_abs_event(dev, code, &value); - change_bit(code, dev->sw); + break; - break; + case EV_REL: + if (is_event_supported(code, dev->relbit, REL_MAX) && value) + disposition = INPUT_PASS_TO_HANDLERS; - case EV_ABS: + break; - if (code > ABS_MAX || !test_bit(code, dev->absbit)) - return; + case EV_MSC: + if (is_event_supported(code, dev->mscbit, MSC_MAX)) + disposition = INPUT_PASS_TO_ALL; - if (dev->absfuzz[code]) { - if ((value > dev->abs[code] - (dev->absfuzz[code] >> 1)) && - (value < dev->abs[code] + (dev->absfuzz[code] >> 1))) - return; + break; - if ((value > dev->abs[code] - dev->absfuzz[code]) && - (value < dev->abs[code] + dev->absfuzz[code])) - value = (dev->abs[code] * 3 + value) >> 2; + case EV_LED: + if (is_event_supported(code, dev->ledbit, LED_MAX) && + !!test_bit(code, dev->led) != !!value) { - if ((value > dev->abs[code] - (dev->absfuzz[code] << 1)) && - (value < dev->abs[code] + (dev->absfuzz[code] << 1))) - value = (dev->abs[code] + value) >> 1; - } + __change_bit(code, dev->led); + disposition = INPUT_PASS_TO_ALL; + } + break; - if (dev->abs[code] == value) - return; + case EV_SND: + if (is_event_supported(code, dev->sndbit, SND_MAX)) { - dev->abs[code] = value; - break; + if (!!test_bit(code, dev->snd) != !!value) + __change_bit(code, dev->snd); + disposition = INPUT_PASS_TO_ALL; + } + break; - case EV_REL: + case EV_REP: + if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) { + dev->rep[code] = value; + disposition = INPUT_PASS_TO_ALL; + } + break; - if (code > REL_MAX || !test_bit(code, dev->relbit) || (value == 0)) - return; + case EV_FF: + if (value >= 0) + disposition = INPUT_PASS_TO_ALL; + break; - break; + case EV_PWR: + disposition = INPUT_PASS_TO_ALL; + break; + } - case EV_MSC: + *pval = value; + return disposition; +} - if (code > MSC_MAX || !test_bit(code, dev->mscbit)) - return; +static void input_handle_event(struct input_dev *dev, + unsigned int type, unsigned int code, int value) +{ + int disposition; - if (dev->event) dev->event(dev, type, code, value); + disposition = input_get_disposition(dev, type, code, &value); - break; + if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) + dev->event(dev, type, code, value); - case EV_LED: + if (!dev->vals) + return; - if (code > LED_MAX || !test_bit(code, dev->ledbit) || !!test_bit(code, dev->led) == value) - return; + if (disposition & INPUT_PASS_TO_HANDLERS) { + struct input_value *v; - change_bit(code, dev->led); - if (dev->event) dev->event(dev, type, code, value); + if (disposition & INPUT_SLOT) { + v = &dev->vals[dev->num_vals++]; + v->type = EV_ABS; + v->code = ABS_MT_SLOT; + v->value = dev->mt->slot; + } - break; + v = &dev->vals[dev->num_vals++]; + v->type = type; + v->code = code; + v->value = value; + } - case EV_SND: + if (disposition & INPUT_FLUSH) { + if (dev->num_vals >= 2) + input_pass_values(dev, dev->vals, dev->num_vals); + dev->num_vals = 0; + } else if (dev->num_vals >= dev->max_vals - 2) { + dev->vals[dev->num_vals++] = input_value_sync; + input_pass_values(dev, dev->vals, dev->num_vals); + dev->num_vals = 0; + } - if (code > SND_MAX || !test_bit(code, dev->sndbit)) - return; +} - if (dev->event) dev->event(dev, type, code, value); +/** + * 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 to report input events. See also input_inject_event(). + * + * NOTE: input_event() may be safely used right after input device was + * allocated with input_allocate_device(), even before it is registered + * with input_register_device(), but the event will not reach any of the + * input handlers. Such early invocation of input_event() may be used + * to 'seed' initial state of a switch or initial position of absolute + * axis, etc. + */ +void input_event(struct input_dev *dev, + unsigned int type, unsigned int code, int value) +{ + unsigned long flags; - break; + if (is_event_supported(type, dev->evbit, EV_MAX)) { - case EV_REP: + spin_lock_irqsave(&dev->event_lock, flags); + input_handle_event(dev, type, code, value); + spin_unlock_irqrestore(&dev->event_lock, flags); + } +} +EXPORT_SYMBOL(input_event); - if (code > REP_MAX || value < 0 || dev->rep[code] == value) return; +/** + * 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 = handle->dev; + struct input_handle *grab; + unsigned long flags; - dev->rep[code] = value; - if (dev->event) dev->event(dev, type, code, value); + if (is_event_supported(type, dev->evbit, EV_MAX)) { + spin_lock_irqsave(&dev->event_lock, flags); - break; + rcu_read_lock(); + grab = rcu_dereference(dev->grab); + if (!grab || grab == handle) + input_handle_event(dev, type, code, value); + rcu_read_unlock(); - case EV_FF: - if (dev->event) dev->event(dev, type, code, value); - break; + spin_unlock_irqrestore(&dev->event_lock, flags); } +} +EXPORT_SYMBOL(input_inject_event); - if (type != EV_SYN) - dev->sync = 0; +/** + * input_alloc_absinfo - allocates array of input_absinfo structs + * @dev: the input device emitting absolute events + * + * If the absinfo struct the caller asked for is already allocated, this + * functions will not do anything. + */ +void input_alloc_absinfo(struct input_dev *dev) +{ + if (!dev->absinfo) + dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo), + GFP_KERNEL); - 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); + WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__); } +EXPORT_SYMBOL(input_alloc_absinfo); -static void input_repeat_key(unsigned long data) +void input_set_abs_params(struct input_dev *dev, unsigned int axis, + int min, int max, int fuzz, int flat) { - struct input_dev *dev = (void *) data; + struct input_absinfo *absinfo; - if (!test_bit(dev->repeat_key, dev->key)) + input_alloc_absinfo(dev); + if (!dev->absinfo) return; - input_event(dev, EV_KEY, dev->repeat_key, 2); - input_sync(dev); + absinfo = &dev->absinfo[axis]; + absinfo->minimum = min; + absinfo->maximum = max; + absinfo->fuzz = fuzz; + absinfo->flat = flat; - if (dev->rep[REP_PERIOD]) - mod_timer(&dev->timer, jiffies + msecs_to_jiffies(dev->rep[REP_PERIOD])); + dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis); } +EXPORT_SYMBOL(input_set_abs_params); + -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); + + out: + mutex_unlock(&dev->mutex); + return retval; } +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; + struct input_handle *grabber; - handle->dev->grab = handle; - return 0; + grabber = rcu_dereference_protected(dev->grab, + lockdep_is_held(&dev->mutex)); + if (grabber == 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); + } } +/** + * 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 = down_interruptible(&dev->sem); - 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--; - - up(&dev->sem); + 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(); + } + } - return err; + out: + mutex_unlock(&dev->mutex); + 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); - down(&dev->sem); + __input_release_device(handle); if (!--dev->users && dev->close) dev->close(dev); - handle->open--; - up(&dev->sem); + 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) +/* + * Simulate keyup events for all keys that are marked as pressed. + * The function must be called with dev->event_lock held. + */ +static void input_dev_release_keys(struct input_dev *dev) { - list_add_tail(&handle->d_node, &handle->dev->h_list); - list_add_tail(&handle->h_node, &handle->handler->h_list); + int code; + + 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); + } } -#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; +/* + * Prepare device for unregistering + */ +static void input_disconnect_device(struct input_dev *dev) +{ + struct input_handle *handle; + + /* + * 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. + */ + input_dev_release_keys(dev); + + list_for_each_entry(handle, &dev->h_list, d_node) + handle->open = 0; + + spin_unlock_irq(&dev->event_lock); +} + +/** + * input_scancode_to_scalar() - converts scancode in &struct input_keymap_entry + * @ke: keymap entry containing scancode to be converted. + * @scancode: pointer to the location where converted scancode should + * be stored. + * + * This function is used to convert scancode stored in &struct keymap_entry + * into scalar form understood by legacy keymap handling methods. These + * methods expect scancodes to be represented as 'unsigned int'. + */ +int input_scancode_to_scalar(const struct input_keymap_entry *ke, + unsigned int *scancode) +{ + switch (ke->len) { + case 1: + *scancode = *((u8 *)ke->scancode); + break; + + case 2: + *scancode = *((u16 *)ke->scancode); + break; + + case 4: + *scancode = *((u32 *)ke->scancode); + break; + + default: + return -EINVAL; + } + + return 0; +} +EXPORT_SYMBOL(input_scancode_to_scalar); + +/* + * Those routines handle the default case where no [gs]etkeycode() is + * defined. In this case, an array indexed by the scancode is used. + */ + +static unsigned int input_fetch_keycode(struct input_dev *dev, + unsigned int index) +{ + switch (dev->keycodesize) { + case 1: + return ((u8 *)dev->keycode)[index]; + + case 2: + return ((u16 *)dev->keycode)[index]; + + default: + return ((u32 *)dev->keycode)[index]; + } +} -static struct input_device_id *input_match_device(struct input_device_id *id, struct input_dev *dev) +static int input_default_getkeycode(struct input_dev *dev, + struct input_keymap_entry *ke) { + unsigned int index; + int error; + + if (!dev->keycodesize) + return -EINVAL; + + if (ke->flags & INPUT_KEYMAP_BY_INDEX) + index = ke->index; + else { + error = input_scancode_to_scalar(ke, &index); + if (error) + return error; + } + + if (index >= dev->keycodemax) + return -EINVAL; + + ke->keycode = input_fetch_keycode(dev, index); + ke->index = index; + ke->len = sizeof(index); + memcpy(ke->scancode, &index, sizeof(index)); + + return 0; +} + +static int input_default_setkeycode(struct input_dev *dev, + const struct input_keymap_entry *ke, + unsigned int *old_keycode) +{ + unsigned int index; + int error; int i; - for (; id->flags || id->driver_info; id++) { + if (!dev->keycodesize) + return -EINVAL; + + if (ke->flags & INPUT_KEYMAP_BY_INDEX) { + index = ke->index; + } else { + error = input_scancode_to_scalar(ke, &index); + if (error) + return error; + } + + if (index >= dev->keycodemax) + return -EINVAL; + + if (dev->keycodesize < sizeof(ke->keycode) && + (ke->keycode >> (dev->keycodesize * 8))) + return -EINVAL; + + switch (dev->keycodesize) { + case 1: { + u8 *k = (u8 *)dev->keycode; + *old_keycode = k[index]; + k[index] = ke->keycode; + break; + } + case 2: { + u16 *k = (u16 *)dev->keycode; + *old_keycode = k[index]; + k[index] = ke->keycode; + break; + } + default: { + u32 *k = (u32 *)dev->keycode; + *old_keycode = k[index]; + k[index] = ke->keycode; + break; + } + } + + __clear_bit(*old_keycode, dev->keybit); + __set_bit(ke->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 + * @ke: keymap entry + * + * This function should be called by anyone interested in retrieving current + * keymap. Presently evdev handlers use it. + */ +int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke) +{ + unsigned long flags; + int retval; + + spin_lock_irqsave(&dev->event_lock, flags); + retval = dev->getkeycode(dev, ke); + spin_unlock_irqrestore(&dev->event_lock, flags); + + return retval; +} +EXPORT_SYMBOL(input_get_keycode); + +/** + * input_set_keycode - attribute a keycode to a given scancode + * @dev: input device which keymap is being updated + * @ke: new keymap entry + * + * 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, + const struct input_keymap_entry *ke) +{ + unsigned long flags; + unsigned int old_keycode; + int retval; + + if (ke->keycode > KEY_MAX) + return -EINVAL; + + spin_lock_irqsave(&dev->event_lock, flags); + + retval = dev->setkeycode(dev, ke, &old_keycode); + if (retval) + goto out; + + /* Make sure KEY_RESERVED did not get enabled. */ + __clear_bit(KEY_RESERVED, dev->keybit); + + /* + * Simulate keyup event if keycode is not present + * in the keymap anymore + */ + if (test_bit(EV_KEY, dev->evbit) && + !is_event_supported(old_keycode, dev->keybit, KEY_MAX) && + __test_and_clear_bit(old_keycode, dev->key)) { + struct input_value vals[] = { + { EV_KEY, old_keycode, 0 }, + input_value_sync + }; + + input_pass_values(dev, vals, ARRAY_SIZE(vals)); + } + + out: + spin_unlock_irqrestore(&dev->event_lock, flags); + + return retval; +} +EXPORT_SYMBOL(input_set_keycode); + +static const struct input_device_id *input_match_device(struct input_handler *handler, + struct input_dev *dev) +{ + const struct input_device_id *id; + + for (id = handler->id_table; id->flags || id->driver_info; id++) { if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) - if (id->id.bustype != dev->id.bustype) + if (id->bustype != dev->id.bustype) continue; if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR) - if (id->id.vendor != dev->id.vendor) + if (id->vendor != dev->id.vendor) continue; if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT) - if (id->id.product != dev->id.product) + if (id->product != dev->id.product) continue; if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION) - if (id->id.version != dev->id.version) + if (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); + if (!bitmap_subset(id->evbit, dev->evbit, EV_MAX)) + continue; + + if (!bitmap_subset(id->keybit, dev->keybit, KEY_MAX)) + continue; + + if (!bitmap_subset(id->relbit, dev->relbit, REL_MAX)) + continue; + + if (!bitmap_subset(id->absbit, dev->absbit, ABS_MAX)) + continue; + + if (!bitmap_subset(id->mscbit, dev->mscbit, MSC_MAX)) + continue; + + if (!bitmap_subset(id->ledbit, dev->ledbit, LED_MAX)) + continue; - return id; + if (!bitmap_subset(id->sndbit, dev->sndbit, SND_MAX)) + continue; + + if (!bitmap_subset(id->ffbit, dev->ffbit, FF_MAX)) + continue; + + if (!bitmap_subset(id->swbit, dev->swbit, SW_MAX)) + continue; + + if (!handler->match || handler->match(handler, dev)) + return id; } return NULL; } -static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, int max) +static int input_attach_handler(struct input_dev *dev, struct input_handler *handler) +{ + const struct input_device_id *id; + int error; + + id = input_match_device(handler, dev); + if (!id) + return -ENODEV; + + error = handler->connect(handler, dev, id); + if (error && error != -ENODEV) + pr_err("failed to attach handler %s to device %s, error: %d\n", + handler->name, kobject_name(&dev->dev.kobj), error); + + return error; +} + +#ifdef CONFIG_COMPAT + +static int input_bits_to_string(char *buf, int buf_size, + unsigned long bits, bool skip_empty) { - int i; int len = 0; - for (i = NBITS(max) - 1; i > 0; i--) - if (bitmap[i]) - break; + if (INPUT_COMPAT_TEST) { + u32 dword = bits >> 32; + if (dword || !skip_empty) + len += snprintf(buf, buf_size, "%x ", dword); + + dword = bits & 0xffffffffUL; + if (dword || !skip_empty || len) + len += snprintf(buf + len, max(buf_size - len, 0), + "%x", dword); + } else { + if (bits || !skip_empty) + len += snprintf(buf, buf_size, "%lx", bits); + } - for (; i >= 0; i--) - len += snprintf(buf + len, max(buf_size - len, 0), - "%lx%s", bitmap[i], i > 0 ? " " : ""); return len; } +#else /* !CONFIG_COMPAT */ + +static int input_bits_to_string(char *buf, int buf_size, + unsigned long bits, bool skip_empty) +{ + return bits || !skip_empty ? + snprintf(buf, buf_size, "%lx", bits) : 0; +} + +#endif + #ifdef CONFIG_PROC_FS static struct proc_dir_entry *proc_bus_input_dir; @@ -343,154 +1045,234 @@ static inline void input_wakeup_procfs_readers(void) wake_up(&input_devices_poll_wait); } -static unsigned int input_devices_poll(struct file *file, poll_table *wait) +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; } -#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) +union input_seq_state { + struct { + unsigned short pos; + bool mutex_acquired; + }; + void *p; +}; -#define TEST_AND_SPRINTF_BIT(ev, bm) \ - do { \ - if (test_bit(EV_##ev, dev->evbit)) \ - SPRINTF_BIT(ev, bm); \ - } while (0) +static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos) +{ + union input_seq_state *state = (union input_seq_state *)&seq->private; + int error; + + /* We need to fit into seq->private pointer */ + BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); -static int input_devices_read(char *buf, char **start, off_t pos, int count, int *eof, void *data) + error = mutex_lock_interruptible(&input_mutex); + if (error) { + state->mutex_acquired = false; + return ERR_PTR(error); + } + + state->mutex_acquired = true; + + return seq_list_start(&input_dev_list, *pos); +} + +static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos) { - struct input_dev *dev; + return seq_list_next(v, &input_dev_list, pos); +} + +static void input_seq_stop(struct seq_file *seq, void *v) +{ + union input_seq_state *state = (union input_seq_state *)&seq->private; + + if (state->mutex_acquired) + mutex_unlock(&input_mutex); +} + +static void input_seq_print_bitmap(struct seq_file *seq, const char *name, + unsigned long *bitmap, int max) +{ + int i; + bool skip_empty = true; + char buf[18]; + + seq_printf(seq, "B: %s=", name); + + for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { + if (input_bits_to_string(buf, sizeof(buf), + bitmap[i], skip_empty)) { + skip_empty = false; + seq_printf(seq, "%s%s", buf, i > 0 ? " " : ""); + } + } + + /* + * If no output was produced print a single 0. + */ + if (skip_empty) + seq_puts(seq, "0"); + + seq_putc(seq, '\n'); +} + +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->dev.kobj, GFP_KERNEL); struct input_handle *handle; - const char *path; - off_t at = 0; - int len, cnt = 0; + seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n", + dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version); + + 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(dev, &input_dev_list, node) { + list_for_each_entry(handle, &dev->h_list, d_node) + seq_printf(seq, "%s ", handle->name); + seq_putc(seq, '\n'); - path = dev->dynalloc ? kobject_get_path(&dev->cdev.kobj, GFP_KERNEL) : NULL; + input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX); + + input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX); + if (test_bit(EV_KEY, dev->evbit)) + input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX); + if (test_bit(EV_REL, dev->evbit)) + input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX); + if (test_bit(EV_ABS, dev->evbit)) + input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX); + if (test_bit(EV_MSC, dev->evbit)) + input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX); + if (test_bit(EV_LED, dev->evbit)) + input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX); + if (test_bit(EV_SND, dev->evbit)) + input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX); + if (test_bit(EV_FF, dev->evbit)) + input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX); + if (test_bit(EV_SW, dev->evbit)) + input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX); - 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); + seq_putc(seq, '\n'); - 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="); + kfree(path); + return 0; +} - 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; - } +static const struct seq_operations input_devices_seq_ops = { + .start = input_devices_seq_start, + .next = input_devices_seq_next, + .stop = input_seq_stop, + .show = input_devices_seq_show, +}; - kfree(path); +static int input_proc_devices_open(struct inode *inode, struct file *file) +{ + return seq_open(file, &input_devices_seq_ops); +} + +static const struct file_operations input_devices_fileops = { + .owner = THIS_MODULE, + .open = input_proc_devices_open, + .poll = input_proc_devices_poll, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + +static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos) +{ + union input_seq_state *state = (union input_seq_state *)&seq->private; + int error; + + /* We need to fit into seq->private pointer */ + BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private)); + + error = mutex_lock_interruptible(&input_mutex); + if (error) { + state->mutex_acquired = false; + return ERR_PTR(error); } - if (&dev->node == &input_dev_list) - *eof = 1; + state->mutex_acquired = true; + state->pos = *pos; - return (count > cnt) ? cnt : count; + return seq_list_start(&input_handler_list, *pos); } -static int input_handlers_read(char *buf, char **start, off_t pos, int count, int *eof, void *data) +static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos) { - struct input_handler *handler; + union input_seq_state *state = (union input_seq_state *)&seq->private; - off_t at = 0; - int len = 0, cnt = 0; - int i = 0; + state->pos = *pos + 1; + return seq_list_next(v, &input_handler_list, pos); +} - list_for_each_entry(handler, &input_handler_list, node) { +static int input_handlers_seq_show(struct seq_file *seq, void *v) +{ + struct input_handler *handler = container_of(v, struct input_handler, node); + union input_seq_state *state = (union input_seq_state *)&seq->private; - 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); + seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name); + if (handler->filter) + seq_puts(seq, " (filter)"); + if (handler->legacy_minors) + seq_printf(seq, " Minor=%d", handler->minor); + seq_putc(seq, '\n'); - at += len; + return 0; +} - 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; +static const struct seq_operations input_handlers_seq_ops = { + .start = input_handlers_seq_start, + .next = input_handlers_seq_next, + .stop = input_seq_stop, + .show = input_handlers_seq_show, +}; - return (count > cnt) ? cnt : count; +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_fileops; +static const struct file_operations input_handlers_fileops = { + .owner = THIS_MODULE, + .open = input_proc_handlers_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; 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_read_entry("devices", 0, proc_bus_input_dir, input_devices_read, NULL); + entry = proc_create("devices", 0, proc_bus_input_dir, + &input_devices_fileops); 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); + entry = proc_create("handlers", 0, proc_bus_input_dir, + &input_handlers_fileops); 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); + fail1: remove_proc_entry("bus/input", NULL); return -ENOMEM; } @@ -498,7 +1280,7 @@ 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 */ @@ -507,46 +1289,119 @@ 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); +#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); INPUT_DEV_STRING_ATTR_SHOW(uniq); +static int input_print_modalias_bits(char *buf, int size, + char name, unsigned long *bm, + unsigned int min_bit, unsigned int max_bit) +{ + int len = 0, i; + + len += snprintf(buf, max(size, 0), "%c", name); + for (i = min_bit; i < max_bit; i++) + if (bm[BIT_WORD(i)] & BIT_MASK(i)) + len += snprintf(buf + len, max(size - len, 0), "%X,", i); + return len; +} + +static int input_print_modalias(char *buf, int size, struct input_dev *id, + int add_cr) +{ + int len; + + len = snprintf(buf, max(size, 0), + "input:b%04Xv%04Xp%04Xe%04X-", + id->id.bustype, id->id.vendor, + id->id.product, id->id.version); + + len += input_print_modalias_bits(buf + len, size - len, + 'e', id->evbit, 0, EV_MAX); + len += input_print_modalias_bits(buf + len, size - len, + 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX); + len += input_print_modalias_bits(buf + len, size - len, + 'r', id->relbit, 0, REL_MAX); + len += input_print_modalias_bits(buf + len, size - len, + 'a', id->absbit, 0, ABS_MAX); + len += input_print_modalias_bits(buf + len, size - len, + 'm', id->mscbit, 0, MSC_MAX); + len += input_print_modalias_bits(buf + len, size - len, + 'l', id->ledbit, 0, LED_MAX); + len += input_print_modalias_bits(buf + len, size - len, + 's', id->sndbit, 0, SND_MAX); + len += input_print_modalias_bits(buf + len, size - len, + 'f', id->ffbit, 0, FF_MAX); + len += input_print_modalias_bits(buf + len, size - len, + 'w', id->swbit, 0, SW_MAX); + + if (add_cr) + len += snprintf(buf + len, max(size - len, 0), "\n"); + + return len; +} + +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; + + len = input_print_modalias(buf, PAGE_SIZE, id, 1); + + return min_t(int, len, PAGE_SIZE); +} +static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL); + +static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, + int max, int add_cr); + +static ssize_t input_dev_show_properties(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->propbit, + INPUT_PROP_MAX, true); + return min_t(int, len, PAGE_SIZE); +} +static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL); + static struct attribute *input_dev_attrs[] = { - &class_device_attr_name.attr, - &class_device_attr_phys.attr, - &class_device_attr_uniq.attr, + &dev_attr_name.attr, + &dev_attr_phys.attr, + &dev_attr_uniq.attr, + &dev_attr_modalias.attr, + &dev_attr_properties.attr, NULL }; -static struct attribute_group input_dev_group = { +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); +#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); @@ -554,10 +1409,10 @@ 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 }; @@ -566,13 +1421,47 @@ static struct attribute_group input_dev_id_attr_group = { .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); +static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, + int max, int add_cr) +{ + int i; + int len = 0; + bool skip_empty = true; + + for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { + len += input_bits_to_string(buf + len, max(buf_size - len, 0), + bitmap[i], skip_empty); + if (len) { + skip_empty = false; + if (i > 0) + len += snprintf(buf + len, max(buf_size - len, 0), " "); + } + } + + /* + * If no output was produced print a single 0. + */ + if (len == 0) + len = snprintf(buf, buf_size, "%d", 0); + + if (add_cr) + len += snprintf(buf + len, max(buf_size - len, 0), "\n"); + + return len; +} + +#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, \ + true); \ + 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); @@ -585,15 +1474,15 @@ 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 }; @@ -602,65 +1491,90 @@ 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); + input_mt_destroy_slots(dev); + kfree(dev->absinfo); + kfree(dev->vals); kfree(dev); + module_put(THIS_MODULE); } /* - * Input hotplugging interface - loading event handlers based on + * Input uevent interface - loading event handlers based on * device bitfields. */ -static int input_add_hotplug_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) +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) + int len; + + if (add_uevent_var(env, "%s", name)) return -ENOMEM; - envp[*cur_index] = buffer + *cur_len; + len = input_print_bitmap(&env->buf[env->buflen - 1], + sizeof(env->buf) - env->buflen, + bitmap, max, false); + if (len >= (sizeof(env->buf) - env->buflen)) + return -ENOMEM; + + env->buflen += len; + return 0; +} + +static int input_add_uevent_modalias_var(struct kobj_uevent_env *env, + struct input_dev *dev) +{ + 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, "MODALIAS=")) return -ENOMEM; - *cur_len += input_print_bitmap(buffer + *cur_len, - max(buffer_size - *cur_len, 0), - bitmap, max) + 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_hotplug_env_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_hotplug_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(env, dev); \ if (err) \ return err; \ } while (0) -static int input_dev_hotplug(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, @@ -669,9 +1583,11 @@ static int input_dev_hotplug(struct class_device *cdev, char **envp, INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name); if (dev->phys) INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys); - if (dev->phys) + if (dev->uniq) INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq); + INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX); + 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); @@ -690,73 +1606,507 @@ static int input_dev_hotplug(struct class_device *cdev, char **envp, if (test_bit(EV_SW, dev->evbit)) INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX); - envp[i] = NULL; + INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev); + + return 0; +} + +#define INPUT_DO_TOGGLE(dev, type, bits, on) \ + do { \ + int i; \ + bool active; \ + \ + if (!test_bit(EV_##type, dev->evbit)) \ + break; \ + \ + for (i = 0; i < type##_MAX; i++) { \ + if (!test_bit(i, dev->bits##bit)) \ + continue; \ + \ + active = test_bit(i, dev->bits); \ + if (!active && !on) \ + continue; \ + \ + dev->event(dev, EV_##type, i, on ? active : 0); \ + } \ + } while (0) + +static void input_dev_toggle(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]); + } +} + +/** + * input_reset_device() - reset/restore the state of input device + * @dev: input device whose state needs to be reset + * + * This function tries to reset the state of an opened input device and + * bring internal state and state if the hardware in sync with each other. + * We mark all keys as released, restore LED state, repeat rate, etc. + */ +void input_reset_device(struct input_dev *dev) +{ + unsigned long flags; + + mutex_lock(&dev->mutex); + spin_lock_irqsave(&dev->event_lock, flags); + + input_dev_toggle(dev, true); + input_dev_release_keys(dev); + + spin_unlock_irqrestore(&dev->event_lock, flags); + mutex_unlock(&dev->mutex); +} +EXPORT_SYMBOL(input_reset_device); + +#ifdef CONFIG_PM_SLEEP +static int input_dev_suspend(struct device *dev) +{ + struct input_dev *input_dev = to_input_dev(dev); + + spin_lock_irq(&input_dev->event_lock); + + /* + * Keys that are pressed now are unlikely to be + * still pressed when we resume. + */ + input_dev_release_keys(input_dev); + + /* Turn off LEDs and sounds, if any are active. */ + input_dev_toggle(input_dev, false); + + spin_unlock_irq(&input_dev->event_lock); + + return 0; +} + +static int input_dev_resume(struct device *dev) +{ + struct input_dev *input_dev = to_input_dev(dev); + + spin_lock_irq(&input_dev->event_lock); + + /* Restore state of LEDs and sounds, if any were active. */ + input_dev_toggle(input_dev, true); + + spin_unlock_irq(&input_dev->event_lock); + + return 0; +} + +static int input_dev_freeze(struct device *dev) +{ + struct input_dev *input_dev = to_input_dev(dev); + + spin_lock_irq(&input_dev->event_lock); + + /* + * Keys that are pressed now are unlikely to be + * still pressed when we resume. + */ + input_dev_release_keys(input_dev); + + spin_unlock_irq(&input_dev->event_lock); return 0; } +static int input_dev_poweroff(struct device *dev) +{ + struct input_dev *input_dev = to_input_dev(dev); + + spin_lock_irq(&input_dev->event_lock); + + /* Turn off LEDs and sounds, if any are active. */ + input_dev_toggle(input_dev, false); + + spin_unlock_irq(&input_dev->event_lock); + + return 0; +} + +static const struct dev_pm_ops input_dev_pm_ops = { + .suspend = input_dev_suspend, + .resume = input_dev_resume, + .freeze = input_dev_freeze, + .poweroff = input_dev_poweroff, + .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_SLEEP + .pm = &input_dev_pm_ops, +#endif +}; + +static char *input_devnode(struct device *dev, umode_t *mode) +{ + return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); +} + struct class input_class = { - .name = "input", - .release = input_dev_release, - .hotplug = input_dev_hotplug, + .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) { + static atomic_t input_no = ATOMIC_INIT(0); 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_timer(&dev->timer); INIT_LIST_HEAD(&dev->h_list); INIT_LIST_HEAD(&dev->node); + + dev_set_name(&dev->dev, "input%ld", + (unsigned long) atomic_inc_return(&input_no) - 1); + + __module_get(THIS_MODULE); } return dev; } +EXPORT_SYMBOL(input_allocate_device); + +struct input_devres { + struct input_dev *input; +}; -static void input_register_classdevice(struct input_dev *dev) +static int devm_input_device_match(struct device *dev, void *res, void *data) { - static atomic_t input_no = ATOMIC_INIT(0); - const char *path; + struct input_devres *devres = res; - __module_get(THIS_MODULE); + return devres->input == data; +} - dev->dev = dev->cdev.dev; +static void devm_input_device_release(struct device *dev, void *res) +{ + struct input_devres *devres = res; + struct input_dev *input = devres->input; - snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id), - "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1); + dev_dbg(dev, "%s: dropping reference to %s\n", + __func__, dev_name(&input->dev)); + input_put_device(input); +} - path = kobject_get_path(&dev->cdev.class->subsys.kset.kobj, GFP_KERNEL); - printk(KERN_INFO "input: %s as %s/%s\n", - dev->name ? dev->name : "Unspecified device", - path ? path : "", dev->cdev.class_id); - kfree(path); +/** + * devm_input_allocate_device - allocate managed input device + * @dev: device owning the input device being created + * + * Returns prepared struct input_dev or %NULL. + * + * Managed input devices do not need to be explicitly unregistered or + * freed as it will be done automatically when owner device unbinds from + * its driver (or binding fails). Once managed input device is allocated, + * it is ready to be set up and registered in the same fashion as regular + * input device. There are no special devm_input_device_[un]register() + * variants, regular ones work with both managed and unmanaged devices, + * should you need them. In most cases however, managed input device need + * not be explicitly unregistered or freed. + * + * NOTE: the owner device is set up as parent of input device and users + * should not override it. + */ +struct input_dev *devm_input_allocate_device(struct device *dev) +{ + struct input_dev *input; + struct input_devres *devres; + + devres = devres_alloc(devm_input_device_release, + sizeof(struct input_devres), GFP_KERNEL); + if (!devres) + return NULL; + + input = input_allocate_device(); + if (!input) { + devres_free(devres); + return NULL; + } + + input->dev.parent = dev; + input->devres_managed = true; + + devres->input = input; + devres_add(dev, devres); + + return input; +} +EXPORT_SYMBOL(devm_input_allocate_device); - class_device_add(&dev->cdev); - sysfs_create_group(&dev->cdev.kobj, &input_dev_group); - sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group); - sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group); +/** + * 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) { + if (dev->devres_managed) + WARN_ON(devres_destroy(dev->dev.parent, + devm_input_device_release, + devm_input_device_match, + dev)); + input_put_device(dev); + } } +EXPORT_SYMBOL(input_free_device); -void input_register_device(struct input_dev *dev) +/** + * 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) { - struct input_handle *handle; + switch (type) { + case EV_KEY: + __set_bit(code, dev->keybit); + break; + + case EV_REL: + __set_bit(code, dev->relbit); + break; + + case EV_ABS: + input_alloc_absinfo(dev); + if (!dev->absinfo) + return; + + __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: + pr_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); + +static unsigned int input_estimate_events_per_packet(struct input_dev *dev) +{ + int mt_slots; + int i; + unsigned int events; + + if (dev->mt) { + mt_slots = dev->mt->num_slots; + } else if (test_bit(ABS_MT_TRACKING_ID, dev->absbit)) { + mt_slots = dev->absinfo[ABS_MT_TRACKING_ID].maximum - + dev->absinfo[ABS_MT_TRACKING_ID].minimum + 1, + mt_slots = clamp(mt_slots, 2, 32); + } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) { + mt_slots = 2; + } else { + mt_slots = 0; + } + + events = mt_slots + 1; /* count SYN_MT_REPORT and SYN_REPORT */ + + for (i = 0; i < ABS_CNT; i++) { + if (test_bit(i, dev->absbit)) { + if (input_is_mt_axis(i)) + events += mt_slots; + else + events++; + } + } + + for (i = 0; i < REL_CNT; i++) + if (test_bit(i, dev->relbit)) + events++; + + /* Make room for KEY and MSC events */ + events += 7; + + return events; +} + +#define INPUT_CLEANSE_BITMASK(dev, type, bits) \ + do { \ + if (!test_bit(EV_##type, dev->evbit)) \ + memset(dev->bits##bit, 0, \ + sizeof(dev->bits##bit)); \ + } while (0) + +static void input_cleanse_bitmasks(struct input_dev *dev) +{ + INPUT_CLEANSE_BITMASK(dev, KEY, key); + INPUT_CLEANSE_BITMASK(dev, REL, rel); + INPUT_CLEANSE_BITMASK(dev, ABS, abs); + INPUT_CLEANSE_BITMASK(dev, MSC, msc); + INPUT_CLEANSE_BITMASK(dev, LED, led); + INPUT_CLEANSE_BITMASK(dev, SND, snd); + INPUT_CLEANSE_BITMASK(dev, FF, ff); + INPUT_CLEANSE_BITMASK(dev, SW, sw); +} + +static void __input_unregister_device(struct input_dev *dev) +{ + struct input_handle *handle, *next; + + input_disconnect_device(dev); + + mutex_lock(&input_mutex); + + 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); + + input_wakeup_procfs_readers(); + + mutex_unlock(&input_mutex); + + device_del(&dev->dev); +} + +static void devm_input_device_unregister(struct device *dev, void *res) +{ + struct input_devres *devres = res; + struct input_dev *input = devres->input; + + dev_dbg(dev, "%s: unregistering device %s\n", + __func__, dev_name(&input->dev)); + __input_unregister_device(input); +} + +/** + * 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. + * + * Note that this function is also used to register managed input devices + * (ones allocated with devm_input_allocate_device()). Such managed input + * devices need not be explicitly unregistered or freed, their tear down + * is controlled by the devres infrastructure. It is also worth noting + * that tear down of managed input devices is internally a 2-step process: + * registered managed input device is first unregistered, but stays in + * memory and can still handle input_event() calls (although events will + * not be delivered anywhere). The freeing of managed input device will + * happen later, when devres stack is unwound to the point where device + * allocation was made. + */ +int input_register_device(struct input_dev *dev) +{ + struct input_devres *devres = NULL; struct input_handler *handler; - struct input_device_id *id; + unsigned int packet_size; + const char *path; + int error; + + if (dev->devres_managed) { + devres = devres_alloc(devm_input_device_unregister, + sizeof(struct input_devres), GFP_KERNEL); + if (!devres) + return -ENOMEM; - set_bit(EV_SYN, dev->evbit); + devres->input = dev; + } - init_MUTEX(&dev->sem); + /* Every input device generates EV_SYN/SYN_REPORT events. */ + __set_bit(EV_SYN, dev->evbit); + + /* KEY_RESERVED is not supposed to be transmitted to userspace. */ + __clear_bit(KEY_RESERVED, dev->keybit); + + /* Make sure that bitmasks not mentioned in dev->evbit are clean. */ + input_cleanse_bitmasks(dev); + + packet_size = input_estimate_events_per_packet(dev); + if (dev->hint_events_per_packet < packet_size) + dev->hint_events_per_packet = packet_size; + + dev->max_vals = dev->hint_events_per_packet + 2; + dev->vals = kcalloc(dev->max_vals, sizeof(*dev->vals), GFP_KERNEL); + if (!dev->vals) { + error = -ENOMEM; + goto err_devres_free; + } /* * 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; @@ -764,126 +2114,291 @@ void 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); + if (!dev->getkeycode) + dev->getkeycode = input_default_getkeycode; - if (dev->dynalloc) - input_register_classdevice(dev); + if (!dev->setkeycode) + dev->setkeycode = input_default_setkeycode; - 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); + error = device_add(&dev->dev); + if (error) + goto err_free_vals; + path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); + pr_info("%s as %s\n", + dev->name ? dev->name : "Unspecified device", + path ? path : "N/A"); + kfree(path); - input_wakeup_procfs_readers(); -} + error = mutex_lock_interruptible(&input_mutex); + if (error) + goto err_device_del; -void input_unregister_device(struct input_dev *dev) -{ - struct list_head * node, * next; + list_add_tail(&dev->node, &input_dev_list); - if (!dev) return; + list_for_each_entry(handler, &input_handler_list, node) + input_attach_handler(dev, handler); - del_timer_sync(&dev->timer); + input_wakeup_procfs_readers(); - 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); + mutex_unlock(&input_mutex); + + if (dev->devres_managed) { + dev_dbg(dev->dev.parent, "%s: registering %s with devres.\n", + __func__, dev_name(&dev->dev)); + devres_add(dev->dev.parent, devres); } + return 0; - list_del_init(&dev->node); +err_device_del: + device_del(&dev->dev); +err_free_vals: + kfree(dev->vals); + dev->vals = NULL; +err_devres_free: + devres_free(devres); + return error; +} +EXPORT_SYMBOL(input_register_device); - if (dev->dynalloc) { - sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group); - sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group); - class_device_unregister(&dev->cdev); +/** + * 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) +{ + if (dev->devres_managed) { + WARN_ON(devres_destroy(dev->dev.parent, + devm_input_device_unregister, + devm_input_device_match, + dev)); + __input_unregister_device(dev); + /* + * We do not do input_put_device() here because it will be done + * when 2nd devres fires up. + */ + } else { + __input_unregister_device(dev); + input_put_device(dev); } - - input_wakeup_procfs_readers(); } +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 error; - if (!handler) return; + error = mutex_lock_interruptible(&input_mutex); + if (error) + return error; 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_attach_handler(dev, handler); input_wakeup_procfs_readers(); + + mutex_unlock(&input_mutex); + return 0; } +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); - if (handler->fops != NULL) - input_table[handler->minor >> 5] = NULL; - input_wakeup_procfs_readers(); + + mutex_unlock(&input_mutex); } +EXPORT_SYMBOL(input_unregister_handler); -static int input_open_file(struct inode *inode, struct file *file) +/** + * input_handler_for_each_handle - handle iterator + * @handler: input handler to iterate + * @data: data for the callback + * @fn: function to be called for each handle + * + * Iterate over @bus's list of devices, and call @fn for each, passing + * it @data and stop when @fn returns a non-zero value. The function is + * using RCU to traverse the list and therefore may be usind in atonic + * contexts. The @fn callback is invoked from RCU critical section and + * thus must not sleep. + */ +int input_handler_for_each_handle(struct input_handler *handler, void *data, + int (*fn)(struct input_handle *, void *)) { - struct input_handler *handler = input_table[iminor(inode) >> 5]; - struct file_operations *old_fops, *new_fops = NULL; - int err; + struct input_handle *handle; + int retval = 0; - /* No load-on-demand here? */ - if (!handler || !(new_fops = fops_get(handler->fops))) - return -ENODEV; + rcu_read_lock(); + + list_for_each_entry_rcu(handle, &handler->h_list, h_node) { + retval = fn(handle, data); + if (retval) + break; + } + + rcu_read_unlock(); + + return retval; +} +EXPORT_SYMBOL(input_handler_for_each_handle); + +/** + * input_register_handle - register a new input handle + * @handle: handle to register + * + * This function puts a new input handle onto device's + * and handler's lists so that events can flow through + * it once it is opened using input_open_device(). + * + * This function is supposed to be called from handler's + * connect() method. + */ +int input_register_handle(struct input_handle *handle) +{ + struct input_handler *handler = handle->handler; + struct input_dev *dev = handle->dev; + int error; /* - * That's _really_ odd. Usually NULL ->open means "nothing special", - * not "no device". Oh, well... + * We take dev->mutex here to prevent race with + * input_release_device(). */ - if (!new_fops->open) { - fops_put(new_fops); - return -ENODEV; - } - old_fops = file->f_op; - file->f_op = new_fops; + error = mutex_lock_interruptible(&dev->mutex); + if (error) + return error; - err = new_fops->open(inode, file); + /* + * Filters go to the head of the list, normal handlers + * to the tail. + */ + if (handler->filter) + list_add_rcu(&handle->d_node, &dev->h_list); + else + list_add_tail_rcu(&handle->d_node, &dev->h_list); - if (err) { - fops_put(file->f_op); - file->f_op = fops_get(old_fops); + mutex_unlock(&dev->mutex); + + /* + * Since we are supposed to be called from ->connect() + * which is mutually exclusive with ->disconnect() + * we can't be racing with input_unregister_handle() + * and so separate lock is not needed here. + */ + list_add_tail_rcu(&handle->h_node, &handler->h_list); + + if (handler->start) + handler->start(handle); + + return 0; +} +EXPORT_SYMBOL(input_register_handle); + +/** + * input_unregister_handle - unregister an input handle + * @handle: handle to unregister + * + * This function removes input handle from device's + * and handler's lists. + * + * This function is supposed to be called from handler's + * disconnect() method. + */ +void input_unregister_handle(struct input_handle *handle) +{ + struct input_dev *dev = handle->dev; + + list_del_rcu(&handle->h_node); + + /* + * Take dev->mutex to prevent race with input_release_device(). + */ + mutex_lock(&dev->mutex); + list_del_rcu(&handle->d_node); + mutex_unlock(&dev->mutex); + + synchronize_rcu(); +} +EXPORT_SYMBOL(input_unregister_handle); + +/** + * input_get_new_minor - allocates a new input minor number + * @legacy_base: beginning or the legacy range to be searched + * @legacy_num: size of legacy range + * @allow_dynamic: whether we can also take ID from the dynamic range + * + * This function allocates a new device minor for from input major namespace. + * Caller can request legacy minor by specifying @legacy_base and @legacy_num + * parameters and whether ID can be allocated from dynamic range if there are + * no free IDs in legacy range. + */ +int input_get_new_minor(int legacy_base, unsigned int legacy_num, + bool allow_dynamic) +{ + /* + * This function should be called from input handler's ->connect() + * methods, which are serialized with input_mutex, so no additional + * locking is needed here. + */ + if (legacy_base >= 0) { + int minor = ida_simple_get(&input_ida, + legacy_base, + legacy_base + legacy_num, + GFP_KERNEL); + if (minor >= 0 || !allow_dynamic) + return minor; } - fops_put(old_fops); - return err; + + return ida_simple_get(&input_ida, + INPUT_FIRST_DYNAMIC_DEV, INPUT_MAX_CHAR_DEVICES, + GFP_KERNEL); } +EXPORT_SYMBOL(input_get_new_minor); -static struct file_operations input_fops = { - .owner = THIS_MODULE, - .open = input_open_file, -}; +/** + * input_free_minor - release previously allocated minor + * @minor: minor to be released + * + * This function releases previously allocated input minor so that it can be + * reused later. + */ +void input_free_minor(unsigned int minor) +{ + ida_simple_remove(&input_ida, minor); +} +EXPORT_SYMBOL(input_free_minor); static int __init input_init(void) { @@ -891,7 +2406,7 @@ static int __init input_init(void) err = class_register(&input_class); if (err) { - printk(KERN_ERR "input: unable to register input_dev class\n"); + pr_err("unable to register input_dev class\n"); return err; } @@ -899,9 +2414,10 @@ static int __init input_init(void) if (err) goto fail1; - err = register_chrdev(INPUT_MAJOR, "input", &input_fops); + err = register_chrdev_region(MKDEV(INPUT_MAJOR, 0), + INPUT_MAX_CHAR_DEVICES, "input"); if (err) { - printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR); + pr_err("unable to register char major %d", INPUT_MAJOR); goto fail2; } @@ -915,7 +2431,8 @@ static int __init input_init(void) static void __exit input_exit(void) { input_proc_exit(); - unregister_chrdev(INPUT_MAJOR, "input"); + unregister_chrdev_region(MKDEV(INPUT_MAJOR, 0), + INPUT_MAX_CHAR_DEVICES); class_unregister(&input_class); } |