diff options
Diffstat (limited to 'drivers/input/input.c')
| -rw-r--r-- | drivers/input/input.c | 1211 |
1 files changed, 898 insertions, 313 deletions
diff --git a/drivers/input/input.c b/drivers/input/input.c index ab060710688..29ca0bb4f56 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -10,10 +10,14 @@ * the Free Software Foundation. */ +#define pr_fmt(fmt) KBUILD_BASENAME ": " fmt + #include <linux/init.h> #include <linux/types.h> -#include <linux/input.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> @@ -23,31 +27,15 @@ #include <linux/device.h> #include <linux/mutex.h> #include <linux/rcupdate.h> -#include <linux/smp_lock.h> +#include "input-compat.h" MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>"); MODULE_DESCRIPTION("Input core"); 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)]; +#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); @@ -60,7 +48,7 @@ static LIST_HEAD(input_handler_list); */ static DEFINE_MUTEX(input_mutex); -static struct input_handler *input_table[8]; +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) @@ -84,26 +72,102 @@ static int input_defuzz_abs_event(int value, int old_val, int fuzz) 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 through all open handles. This function is called with + * Pass event first through all filters and then, if event has not been + * filtered out, through all open handles. This function is called with * dev->event_lock held and interrupts disabled. */ -static void input_pass_event(struct input_dev *dev, - unsigned int type, unsigned int code, int value) +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; +} + +/* + * 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 (!count) + return; rcu_read_lock(); handle = rcu_dereference(dev->grab); - if (handle) - handle->handler->event(handle, type, code, value); - else + if (handle) { + count = input_to_handler(handle, vals, count); + } else { list_for_each_entry_rcu(handle, &dev->h_list, d_node) if (handle->open) - handle->handler->event(handle, - type, code, value); + count = input_to_handler(handle, vals, count); + } + rcu_read_unlock(); + + 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)); } /* @@ -120,18 +184,12 @@ static void input_repeat_key(unsigned long data) 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_event(dev, EV_KEY, dev->repeat_key, 2); - - 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); - } + input_pass_values(dev, vals, ARRAY_SIZE(vals)); if (dev->rep[REP_PERIOD]) mod_timer(&dev->timer, jiffies + @@ -141,31 +199,68 @@ static void input_repeat_key(unsigned long data) spin_unlock_irqrestore(&dev->event_lock, flags); } -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); -} - #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 void input_handle_event(struct input_dev *dev, - unsigned int type, unsigned int code, int value) +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) { @@ -176,37 +271,34 @@ static void input_handle_event(struct input_dev *dev, break; case SYN_REPORT: - if (!dev->sync) { - dev->sync = 1; - disposition = INPUT_PASS_TO_HANDLERS; - } + disposition = INPUT_PASS_TO_HANDLERS | INPUT_FLUSH; 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 (is_event_supported(code, dev->keybit, KEY_MAX)) { - if (value != 2) { - __change_bit(code, dev->key); - if (value) - input_start_autorepeat(dev, code); - else - input_stop_autorepeat(dev); + /* auto-repeat bypasses state updates */ + if (value == 2) { + disposition = INPUT_PASS_TO_HANDLERS; + break; } - disposition = INPUT_PASS_TO_HANDLERS; + if (!!test_bit(code, dev->key) != !!value) { + + __change_bit(code, dev->key); + disposition = INPUT_PASS_TO_HANDLERS; + } } break; case EV_SW: if (is_event_supported(code, dev->swbit, SW_MAX) && - !!test_bit(code, dev->sw) != value) { + !!test_bit(code, dev->sw) != !!value) { __change_bit(code, dev->sw); disposition = INPUT_PASS_TO_HANDLERS; @@ -214,21 +306,9 @@ static void input_handle_event(struct input_dev *dev, break; case EV_ABS: - if (is_event_supported(code, dev->absbit, ABS_MAX)) { + if (is_event_supported(code, dev->absbit, ABS_MAX)) + disposition = input_handle_abs_event(dev, code, &value); - if (test_bit(code, input_abs_bypass)) { - disposition = INPUT_PASS_TO_HANDLERS; - break; - } - - value = input_defuzz_abs_event(value, - dev->abs[code], dev->absfuzz[code]); - - if (dev->abs[code] != value) { - dev->abs[code] = value; - disposition = INPUT_PASS_TO_HANDLERS; - } - } break; case EV_REL: @@ -245,7 +325,7 @@ static void input_handle_event(struct input_dev *dev, case EV_LED: if (is_event_supported(code, dev->ledbit, LED_MAX) && - !!test_bit(code, dev->led) != value) { + !!test_bit(code, dev->led) != !!value) { __change_bit(code, dev->led); disposition = INPUT_PASS_TO_ALL; @@ -278,14 +358,49 @@ static void input_handle_event(struct input_dev *dev, break; } - if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN) - dev->sync = 0; + *pval = value; + return disposition; +} + +static void input_handle_event(struct input_dev *dev, + unsigned int type, unsigned int code, int value) +{ + int disposition; + + disposition = input_get_disposition(dev, type, code, &value); if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event) dev->event(dev, type, code, value); - if (disposition & INPUT_PASS_TO_HANDLERS) - input_pass_event(dev, type, code, value); + if (!dev->vals) + return; + + if (disposition & INPUT_PASS_TO_HANDLERS) { + struct input_value *v; + + if (disposition & INPUT_SLOT) { + v = &dev->vals[dev->num_vals++]; + v->type = EV_ABS; + v->code = ABS_MT_SLOT; + v->value = dev->mt->slot; + } + + v = &dev->vals[dev->num_vals++]; + v->type = type; + v->code = code; + v->value = value; + } + + 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; + } + } /** @@ -313,7 +428,6 @@ void input_event(struct input_dev *dev, if (is_event_supported(type, dev->evbit, EV_MAX)) { 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); } @@ -353,6 +467,43 @@ void input_inject_event(struct input_handle *handle, EXPORT_SYMBOL(input_inject_event); /** + * 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); + + WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__); +} +EXPORT_SYMBOL(input_alloc_absinfo); + +void input_set_abs_params(struct input_dev *dev, unsigned int axis, + int min, int max, int fuzz, int flat) +{ + struct input_absinfo *absinfo; + + input_alloc_absinfo(dev); + if (!dev->absinfo) + return; + + absinfo = &dev->absinfo[axis]; + absinfo->minimum = min; + absinfo->maximum = max; + absinfo->fuzz = fuzz; + absinfo->flat = flat; + + dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis); +} +EXPORT_SYMBOL(input_set_abs_params); + + +/** * input_grab_device - grabs device for exclusive use * @handle: input handle that wants to own the device * @@ -375,7 +526,6 @@ int input_grab_device(struct input_handle *handle) } rcu_assign_pointer(dev->grab, handle); - synchronize_rcu(); out: mutex_unlock(&dev->mutex); @@ -386,8 +536,11 @@ EXPORT_SYMBOL(input_grab_device); static void __input_release_device(struct input_handle *handle) { struct input_dev *dev = handle->dev; + struct input_handle *grabber; - if (dev->grab == handle) { + 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(); @@ -509,12 +662,30 @@ void input_close_device(struct input_handle *handle) EXPORT_SYMBOL(input_close_device); /* + * 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) +{ + 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); + } +} + +/* * 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 @@ -533,15 +704,7 @@ static void input_disconnect_device(struct input_dev *dev) * 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); - } + input_dev_release_keys(dev); list_for_each_entry(handle, &dev->h_list, d_node) handle->open = 0; @@ -549,76 +712,141 @@ static void input_disconnect_device(struct input_dev *dev) spin_unlock_irq(&dev->event_lock); } -static int input_fetch_keycode(struct input_dev *dev, int scancode) +/** + * 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)[scancode]; + case 1: + return ((u8 *)dev->keycode)[index]; - case 2: - return ((u16 *)dev->keycode)[scancode]; + case 2: + return ((u16 *)dev->keycode)[index]; - default: - return ((u32 *)dev->keycode)[scancode]; + default: + return ((u32 *)dev->keycode)[index]; } } static int input_default_getkeycode(struct input_dev *dev, - int scancode, int *keycode) + struct input_keymap_entry *ke) { + unsigned int index; + int error; + if (!dev->keycodesize) return -EINVAL; - if (scancode >= dev->keycodemax) + 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; - *keycode = input_fetch_keycode(dev, scancode); + 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, - int scancode, int keycode) + const struct input_keymap_entry *ke, + unsigned int *old_keycode) { - int old_keycode; + unsigned int index; + int error; int i; - if (scancode >= dev->keycodemax) + if (!dev->keycodesize) return -EINVAL; - if (!dev->keycodesize) + 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(keycode) && (keycode >> (dev->keycodesize * 8))) + 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[scancode]; - k[scancode] = keycode; + *old_keycode = k[index]; + k[index] = ke->keycode; break; } case 2: { u16 *k = (u16 *)dev->keycode; - old_keycode = k[scancode]; - k[scancode] = keycode; + *old_keycode = k[index]; + k[index] = ke->keycode; break; } default: { u32 *k = (u32 *)dev->keycode; - old_keycode = k[scancode]; - k[scancode] = keycode; + *old_keycode = k[index]; + k[index] = ke->keycode; break; } } - clear_bit(old_keycode, dev->keybit); - set_bit(keycode, dev->keybit); + __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); + if (input_fetch_keycode(dev, i) == *old_keycode) { + __set_bit(*old_keycode, dev->keybit); break; /* Setting the bit twice is useless, so break */ } } @@ -629,52 +857,50 @@ static int input_default_setkeycode(struct input_dev *dev, /** * 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 + * @ke: keymap entry * * This function should be called by anyone interested in retrieving current - * keymap. Presently keyboard and evdev handlers use it. + * keymap. Presently evdev handlers use it. */ -int input_get_keycode(struct input_dev *dev, int scancode, int *keycode) +int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke) { - if (scancode < 0) - return -EINVAL; + 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 dev->getkeycode(dev, scancode, keycode); + return retval; } EXPORT_SYMBOL(input_get_keycode); /** - * input_get_keycode - assign new keycode to a given scancode + * input_set_keycode - attribute a 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 + * @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, int scancode, int keycode) +int input_set_keycode(struct input_dev *dev, + const struct input_keymap_entry *ke) { unsigned long flags; - int old_keycode; + unsigned int old_keycode; int retval; - if (scancode < 0) - return -EINVAL; - - if (keycode < 0 || keycode > KEY_MAX) + if (ke->keycode > KEY_MAX) return -EINVAL; spin_lock_irqsave(&dev->event_lock, flags); - retval = dev->getkeycode(dev, scancode, &old_keycode); + retval = dev->setkeycode(dev, ke, &old_keycode); if (retval) goto out; - retval = dev->setkeycode(dev, scancode, keycode); - if (retval) - goto out; + /* Make sure KEY_RESERVED did not get enabled. */ + __clear_bit(KEY_RESERVED, dev->keybit); /* * Simulate keyup event if keycode is not present @@ -683,10 +909,12 @@ int input_set_keycode(struct input_dev *dev, int scancode, int keycode) 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_event(dev, EV_KEY, old_keycode, 0); - if (dev->sync) - input_pass_event(dev, EV_SYN, SYN_REPORT, 1); + input_pass_values(dev, vals, ARRAY_SIZE(vals)); } out: @@ -696,19 +924,12 @@ int input_set_keycode(struct input_dev *dev, int scancode, int keycode) } EXPORT_SYMBOL(input_set_keycode); -#define MATCH_BIT(bit, max) \ - for (i = 0; i < BITS_TO_LONGS(max); i++) \ - if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \ - break; \ - if (i != BITS_TO_LONGS(max)) \ - continue; - -static const struct input_device_id *input_match_device(const struct input_device_id *id, +static const struct input_device_id *input_match_device(struct input_handler *handler, struct input_dev *dev) { - int i; + const struct input_device_id *id; - for (; id->flags || id->driver_info; id++) { + for (id = handler->id_table; id->flags || id->driver_info; id++) { if (id->flags & INPUT_DEVICE_ID_MATCH_BUS) if (id->bustype != dev->id.bustype) @@ -726,17 +947,35 @@ static const struct input_device_id *input_match_device(const struct input_devic 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); - - return id; + 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; + + 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; @@ -747,23 +986,52 @@ static int input_attach_handler(struct input_dev *dev, struct input_handler *han const struct input_device_id *id; int error; - if (handler->blacklist && input_match_device(handler->blacklist, dev)) - return -ENODEV; - - id = input_match_device(handler->id_table, dev); + id = input_match_device(handler, dev); if (!id) return -ENODEV; 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); + 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 len = 0; + + if (INPUT_COMPAT_TEST) { + u32 dword = bits >> 32; + if (dword || !skip_empty) + len += snprintf(buf, buf_size, "%x ", dword); + + dword = bits & 0xffffffffUL; + if (dword || !skip_empty || len) + len += snprintf(buf + len, max(buf_size - len, 0), + "%x", dword); + } else { + if (bits || !skip_empty) + len += snprintf(buf, buf_size, "%lx", bits); + } + + return len; +} + +#else /* !CONFIG_COMPAT */ + +static int input_bits_to_string(char *buf, int buf_size, + unsigned long bits, bool skip_empty) +{ + return bits || !skip_empty ? + snprintf(buf, buf_size, "%lx", bits) : 0; +} + +#endif #ifdef CONFIG_PROC_FS @@ -832,14 +1100,25 @@ static void input_seq_print_bitmap(struct seq_file *seq, const char *name, unsigned long *bitmap, int max) { int i; - - for (i = BITS_TO_LONGS(max) - 1; i > 0; i--) - if (bitmap[i]) - break; + bool skip_empty = true; + char buf[18]; seq_printf(seq, "B: %s=", name); - for (; i >= 0; i--) - seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : ""); + + for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { + if (input_bits_to_string(buf, sizeof(buf), + bitmap[i], skip_empty)) { + skip_empty = false; + seq_printf(seq, "%s%s", buf, i > 0 ? " " : ""); + } + } + + /* + * If no output was produced print a single 0. + */ + if (skip_empty) + seq_puts(seq, "0"); + seq_putc(seq, '\n'); } @@ -862,6 +1141,8 @@ static int input_devices_seq_show(struct seq_file *seq, void *v) seq_printf(seq, "%s ", handle->name); seq_putc(seq, '\n'); + 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); @@ -941,7 +1222,9 @@ static int input_handlers_seq_show(struct seq_file *seq, void *v) union input_seq_state *state = (union input_seq_state *)&seq->private; seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name); - if (handler->fops) + if (handler->filter) + seq_puts(seq, " (filter)"); + if (handler->legacy_minors) seq_printf(seq, " Minor=%d", handler->minor); seq_putc(seq, '\n'); @@ -1083,11 +1366,26 @@ static ssize_t input_dev_show_modalias(struct device *dev, } 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[] = { &dev_attr_name.attr, &dev_attr_phys.attr, &dev_attr_uniq.attr, &dev_attr_modalias.attr, + &dev_attr_properties.attr, NULL }; @@ -1128,14 +1426,23 @@ static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, { int i; int len = 0; + bool skip_empty = true; + + for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) { + len += input_bits_to_string(buf + len, max(buf_size - len, 0), + bitmap[i], skip_empty); + if (len) { + skip_empty = false; + if (i > 0) + len += snprintf(buf + len, max(buf_size - len, 0), " "); + } + } - for (i = BITS_TO_LONGS(max) - 1; i > 0; i--) - if (bitmap[i]) - break; - - for (; i >= 0; i--) - len += snprintf(buf + len, max(buf_size - len, 0), - "%lx%s", bitmap[i], i > 0 ? " " : ""); + /* + * If no output was produced print a single 0. + */ + if (len == 0) + len = snprintf(buf, buf_size, "%d", 0); if (add_cr) len += snprintf(buf + len, max(buf_size - len, 0), "\n"); @@ -1150,7 +1457,8 @@ static ssize_t input_dev_show_cap_##bm(struct device *dev, \ { \ struct input_dev *input_dev = to_input_dev(dev); \ int len = input_print_bitmap(buf, PAGE_SIZE, \ - input_dev->bm##bit, ev##_MAX, 1); \ + input_dev->bm##bit, ev##_MAX, \ + true); \ return min_t(int, len, PAGE_SIZE); \ } \ static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL) @@ -1195,6 +1503,9 @@ static void input_dev_release(struct device *device) 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); @@ -1209,12 +1520,12 @@ static int input_add_uevent_bm_var(struct kobj_uevent_env *env, { int len; - if (add_uevent_var(env, "%s=", name)) + if (add_uevent_var(env, "%s", name)) return -ENOMEM; len = input_print_bitmap(&env->buf[env->buflen - 1], sizeof(env->buf) - env->buflen, - bitmap, max, 0); + bitmap, max, false); if (len >= (sizeof(env->buf) - env->buflen)) return -ENOMEM; @@ -1275,6 +1586,8 @@ static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) 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); @@ -1318,8 +1631,7 @@ static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env) } \ } while (0) -#ifdef CONFIG_PM -static void input_dev_reset(struct input_dev *dev, bool activate) +static void input_dev_toggle(struct input_dev *dev, bool activate) { if (!dev->event) return; @@ -1333,13 +1645,46 @@ static void input_dev_reset(struct input_dev *dev, bool activate) } } +/** + * 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); - mutex_lock(&input_dev->mutex); - input_dev_reset(input_dev, false); - mutex_unlock(&input_dev->mutex); + 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; } @@ -1348,9 +1693,43 @@ 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); + 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; } @@ -1358,7 +1737,8 @@ static int input_dev_resume(struct device *dev) static const struct dev_pm_ops input_dev_pm_ops = { .suspend = input_dev_suspend, .resume = input_dev_resume, - .poweroff = input_dev_suspend, + .freeze = input_dev_freeze, + .poweroff = input_dev_poweroff, .restore = input_dev_resume, }; #endif /* CONFIG_PM */ @@ -1367,12 +1747,12 @@ static struct device_type input_dev_type = { .groups = input_dev_attr_groups, .release = input_dev_release, .uevent = input_dev_uevent, -#ifdef CONFIG_PM +#ifdef CONFIG_PM_SLEEP .pm = &input_dev_pm_ops, #endif }; -static char *input_devnode(struct device *dev, mode_t *mode) +static char *input_devnode(struct device *dev, umode_t *mode) { return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); } @@ -1386,7 +1766,7 @@ EXPORT_SYMBOL_GPL(input_class); /** * input_allocate_device - allocate memory for new input device * - * Returns prepared struct input_dev or NULL. + * 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 @@ -1394,6 +1774,7 @@ EXPORT_SYMBOL_GPL(input_class); */ 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); @@ -1403,9 +1784,13 @@ struct input_dev *input_allocate_device(void) 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); } @@ -1413,6 +1798,71 @@ struct input_dev *input_allocate_device(void) } EXPORT_SYMBOL(input_allocate_device); +struct input_devres { + struct input_dev *input; +}; + +static int devm_input_device_match(struct device *dev, void *res, void *data) +{ + struct input_devres *devres = res; + + return devres->input == data; +} + +static void devm_input_device_release(struct device *dev, void *res) +{ + struct input_devres *devres = res; + struct input_dev *input = devres->input; + + dev_dbg(dev, "%s: dropping reference to %s\n", + __func__, dev_name(&input->dev)); + input_put_device(input); +} + +/** + * 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); + /** * input_free_device - free memory occupied by input_dev structure * @dev: input device to free @@ -1429,8 +1879,14 @@ EXPORT_SYMBOL(input_allocate_device); */ void input_free_device(struct input_dev *dev) { - if (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); @@ -1455,6 +1911,10 @@ void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int break; case EV_ABS: + input_alloc_absinfo(dev); + if (!dev->absinfo) + return; + __set_bit(code, dev->absbit); break; @@ -1483,9 +1943,8 @@ void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int break; default: - printk(KERN_ERR - "input_set_capability: unknown type %u (code %u)\n", - type, code); + pr_err("input_set_capability: unknown type %u (code %u)\n", + type, code); dump_stack(); return; } @@ -1494,6 +1953,96 @@ void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int } 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 @@ -1505,22 +2054,59 @@ EXPORT_SYMBOL(input_set_capability); * 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) { - static atomic_t input_no = ATOMIC_INIT(0); + struct input_devres *devres = NULL; struct input_handler *handler; + 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; + + devres->input = dev; + } + + /* 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; @@ -1534,23 +2120,19 @@ int input_register_device(struct input_dev *dev) if (!dev->setkeycode) dev->setkeycode = input_default_setkeycode; - dev_set_name(&dev->dev, "input%ld", - (unsigned long) atomic_inc_return(&input_no) - 1); - error = device_add(&dev->dev); if (error) - return error; + goto err_free_vals; 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"); + pr_info("%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; - } + if (error) + goto err_device_del; list_add_tail(&dev->node, &input_dev_list); @@ -1561,7 +2143,21 @@ int input_register_device(struct input_dev *dev) 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; + +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); @@ -1574,24 +2170,20 @@ EXPORT_SYMBOL(input_register_device); */ 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_unregister(&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); + } } EXPORT_SYMBOL(input_unregister_device); @@ -1606,22 +2198,14 @@ EXPORT_SYMBOL(input_unregister_device); int input_register_handler(struct input_handler *handler) { struct input_dev *dev; - int retval; + int error; - retval = mutex_lock_interruptible(&input_mutex); - if (retval) - return retval; + error = mutex_lock_interruptible(&input_mutex); + if (error) + return error; INIT_LIST_HEAD(&handler->h_list); - 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) @@ -1629,9 +2213,8 @@ int input_register_handler(struct input_handler *handler) input_wakeup_procfs_readers(); - out: mutex_unlock(&input_mutex); - return retval; + return 0; } EXPORT_SYMBOL(input_register_handler); @@ -1654,9 +2237,6 @@ void input_unregister_handler(struct input_handler *handler) list_del_init(&handler->node); - if (handler->fops != NULL) - input_table[handler->minor >> 5] = NULL; - input_wakeup_procfs_readers(); mutex_unlock(&input_mutex); @@ -1719,7 +2299,16 @@ int input_register_handle(struct input_handle *handle) error = mutex_lock_interruptible(&dev->mutex); if (error) return error; - list_add_tail_rcu(&handle->d_node, &dev->h_list); + + /* + * Filters go to the head of the list, normal handlers + * to the tail. + */ + if (handler->filter) + list_add_rcu(&handle->d_node, &dev->h_list); + else + list_add_tail_rcu(&handle->d_node, &dev->h_list); + mutex_unlock(&dev->mutex); /* @@ -1764,66 +2353,60 @@ void input_unregister_handle(struct input_handle *handle) } EXPORT_SYMBOL(input_unregister_handle); -static int input_open_file(struct inode *inode, struct file *file) +/** + * 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) { - struct input_handler *handler; - const struct file_operations *old_fops, *new_fops = NULL; - int err; - - lock_kernel(); - /* No load-on-demand here? */ - 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", - * not "no device". Oh, well... + * 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 (!new_fops->open) { - fops_put(new_fops); - err = -ENODEV; - goto out; + 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; } - old_fops = file->f_op; - file->f_op = new_fops; - - err = new_fops->open(inode, file); - if (err) { - fops_put(file->f_op); - file->f_op = fops_get(old_fops); - } - fops_put(old_fops); -out: - unlock_kernel(); - 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 const struct file_operations input_fops = { - .owner = THIS_MODULE, - .open = input_open_file, -}; - -static void __init input_init_abs_bypass(void) +/** + * 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) { - const unsigned int *p; - - for (p = input_abs_bypass_init_data; *p; p++) - input_abs_bypass[BIT_WORD(*p)] |= BIT_MASK(*p); + ida_simple_remove(&input_ida, minor); } +EXPORT_SYMBOL(input_free_minor); 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"); + pr_err("unable to register input_dev class\n"); return err; } @@ -1831,9 +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; } @@ -1847,7 +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); } |