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 // SPDX-License-Identifier: GPL-2.0
 // rc-main.c - Remote Controller core module
 //
 // Copyright (C) 2009-2010 by Mauro Carvalho Chehab
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <media/rc-core.h>
 #include <linux/bsearch.h>
 #include <linux/spinlock.h>
 #include <linux/delay.h>
 #include <linux/input.h>
 #include <linux/leds.h>
 #include <linux/slab.h>
 #include <linux/idr.h>
 #include <linux/device.h>
 #include <linux/module.h>
 #include "rc-core-priv.h"
 
 /* Sizes are in bytes, 256 bytes allows for 32 entries on x64 */
 #define IR_TAB_MIN_SIZE 256
 #define IR_TAB_MAX_SIZE 8192
 
 static const struct {
     const char *name;
     unsigned int repeat_period;
     unsigned int scancode_bits;
 } protocols[] = {
     [RC_PROTO_UNKNOWN] = { .name = "unknown", .repeat_period = 125 },
     [RC_PROTO_OTHER] = { .name = "other", .repeat_period = 125 },
     [RC_PROTO_RC5] = { .name = "rc-5",
         .scancode_bits = 0x1f7f, .repeat_period = 114 },
     [RC_PROTO_RC5X_20] = { .name = "rc-5x-20",
         .scancode_bits = 0x1f7f3f, .repeat_period = 114 },
     [RC_PROTO_RC5_SZ] = { .name = "rc-5-sz",
         .scancode_bits = 0x2fff, .repeat_period = 114 },
     [RC_PROTO_JVC] = { .name = "jvc",
         .scancode_bits = 0xffff, .repeat_period = 125 },
     [RC_PROTO_SONY12] = { .name = "sony-12",
         .scancode_bits = 0x1f007f, .repeat_period = 100 },
     [RC_PROTO_SONY15] = { .name = "sony-15",
         .scancode_bits = 0xff007f, .repeat_period = 100 },
     [RC_PROTO_SONY20] = { .name = "sony-20",
         .scancode_bits = 0x1fff7f, .repeat_period = 100 },
     [RC_PROTO_NEC] = { .name = "nec",
         .scancode_bits = 0xffff, .repeat_period = 110 },
     [RC_PROTO_NECX] = { .name = "nec-x",
         .scancode_bits = 0xffffff, .repeat_period = 110 },
     [RC_PROTO_NEC32] = { .name = "nec-32",
         .scancode_bits = 0xffffffff, .repeat_period = 110 },
     [RC_PROTO_SANYO] = { .name = "sanyo",
         .scancode_bits = 0x1fffff, .repeat_period = 125 },
     [RC_PROTO_MCIR2_KBD] = { .name = "mcir2-kbd",
         .scancode_bits = 0xffffff, .repeat_period = 100 },
     [RC_PROTO_MCIR2_MSE] = { .name = "mcir2-mse",
         .scancode_bits = 0x1fffff, .repeat_period = 100 },
     [RC_PROTO_RC6_0] = { .name = "rc-6-0",
         .scancode_bits = 0xffff, .repeat_period = 114 },
     [RC_PROTO_RC6_6A_20] = { .name = "rc-6-6a-20",
         .scancode_bits = 0xfffff, .repeat_period = 114 },
     [RC_PROTO_RC6_6A_24] = { .name = "rc-6-6a-24",
         .scancode_bits = 0xffffff, .repeat_period = 114 },
     [RC_PROTO_RC6_6A_32] = { .name = "rc-6-6a-32",
         .scancode_bits = 0xffffffff, .repeat_period = 114 },
     [RC_PROTO_RC6_MCE] = { .name = "rc-6-mce",
         .scancode_bits = 0xffff7fff, .repeat_period = 114 },
     [RC_PROTO_SHARP] = { .name = "sharp",
         .scancode_bits = 0x1fff, .repeat_period = 125 },
     [RC_PROTO_XMP] = { .name = "xmp", .repeat_period = 125 },
     [RC_PROTO_CEC] = { .name = "cec", .repeat_period = 0 },
     [RC_PROTO_IMON] = { .name = "imon",
         .scancode_bits = 0x7fffffff, .repeat_period = 114 },
     [RC_PROTO_RCMM12] = { .name = "rc-mm-12",
         .scancode_bits = 0x00000fff, .repeat_period = 114 },
     [RC_PROTO_RCMM24] = { .name = "rc-mm-24",
         .scancode_bits = 0x00ffffff, .repeat_period = 114 },
     [RC_PROTO_RCMM32] = { .name = "rc-mm-32",
         .scancode_bits = 0xffffffff, .repeat_period = 114 },
     [RC_PROTO_XBOX_DVD] = { .name = "xbox-dvd", .repeat_period = 64 },
 };
 
 /* Used to keep track of known keymaps */
 static LIST_HEAD(rc_map_list);
 static DEFINE_SPINLOCK(rc_map_lock);
 static struct led_trigger *led_feedback;
 
 /* Used to keep track of rc devices */
 static DEFINE_IDA(rc_ida);
 
 static struct rc_map_list *seek_rc_map(const char *name)
 {
     struct rc_map_list *map = NULL;
 
     spin_lock(&rc_map_lock);
     list_for_each_entry(map, &rc_map_list, list) {
         if (!strcmp(name, map->map.name)) {
             spin_unlock(&rc_map_lock);
             return map;
         }
     }
     spin_unlock(&rc_map_lock);
 
     return NULL;
 }
 
 struct rc_map *rc_map_get(const char *name)
 {
 
     struct rc_map_list *map;
 
     map = seek_rc_map(name);
 #ifdef CONFIG_MODULES
     if (!map) {
         int rc = request_module("%s", name);
         if (rc < 0) {
             pr_err("Couldn't load IR keymap %s\n", name);
             return NULL;
         }
         msleep(20); /* Give some time for IR to register */
 
         map = seek_rc_map(name);
     }
 #endif
     if (!map) {
         pr_err("IR keymap %s not found\n", name);
         return NULL;
     }
 
     printk(KERN_INFO "Registered IR keymap %s\n", map->map.name);
 
     return &map->map;
 }
 EXPORT_SYMBOL_GPL(rc_map_get);
 
 int rc_map_register(struct rc_map_list *map)
 {
     spin_lock(&rc_map_lock);
     list_add_tail(&map->list, &rc_map_list);
     spin_unlock(&rc_map_lock);
     return 0;
 }
 EXPORT_SYMBOL_GPL(rc_map_register);
 
 void rc_map_unregister(struct rc_map_list *map)
 {
     spin_lock(&rc_map_lock);
     list_del(&map->list);
     spin_unlock(&rc_map_lock);
 }
 EXPORT_SYMBOL_GPL(rc_map_unregister);
 
 
 static struct rc_map_table empty[] = {
     { 0x2a, KEY_COFFEE },
 };
 
 static struct rc_map_list empty_map = {
     .map = {
         .scan     = empty,
         .size     = ARRAY_SIZE(empty),
         .rc_proto = RC_PROTO_UNKNOWN,   /* Legacy IR type */
         .name     = RC_MAP_EMPTY,
     }
 };
 
 /**
  * scancode_to_u64() - 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 a version of input_scancode_to_scalar specialized for
  * rc-core.
  */
 static int scancode_to_u64(const struct input_keymap_entry *ke, u64 *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;
 
     case 8:
         *scancode = *((u64 *)ke->scancode);
         break;
 
     default:
         return -EINVAL;
     }
 
     return 0;
 }
 
 /**
  * ir_create_table() - initializes a scancode table
  * @dev:    the rc_dev device
  * @rc_map: the rc_map to initialize
  * @name:   name to assign to the table
  * @rc_proto:   ir type to assign to the new table
  * @size:   initial size of the table
  *
  * This routine will initialize the rc_map and will allocate
  * memory to hold at least the specified number of elements.
  *
  * return:  zero on success or a negative error code
  */
 static int ir_create_table(struct rc_dev *dev, struct rc_map *rc_map,
                const char *name, u64 rc_proto, size_t size)
 {
     rc_map->name = kstrdup(name, GFP_KERNEL);
     if (!rc_map->name)
         return -ENOMEM;
     rc_map->rc_proto = rc_proto;
     rc_map->alloc = roundup_pow_of_two(size * sizeof(struct rc_map_table));
     rc_map->size = rc_map->alloc / sizeof(struct rc_map_table);
     rc_map->scan = kmalloc(rc_map->alloc, GFP_KERNEL);
     if (!rc_map->scan) {
         kfree(rc_map->name);
         rc_map->name = NULL;
         return -ENOMEM;
     }
 
     dev_dbg(&dev->dev, "Allocated space for %u keycode entries (%u bytes)\n",
         rc_map->size, rc_map->alloc);
     return 0;
 }
 
 /**
  * ir_free_table() - frees memory allocated by a scancode table
  * @rc_map: the table whose mappings need to be freed
  *
  * This routine will free memory alloctaed for key mappings used by given
  * scancode table.
  */
 static void ir_free_table(struct rc_map *rc_map)
 {
     rc_map->size = 0;
     kfree(rc_map->name);
     rc_map->name = NULL;
     kfree(rc_map->scan);
     rc_map->scan = NULL;
 }
 
 /**
  * ir_resize_table() - resizes a scancode table if necessary
  * @dev:    the rc_dev device
  * @rc_map: the rc_map to resize
  * @gfp_flags:  gfp flags to use when allocating memory
  *
  * This routine will shrink the rc_map if it has lots of
  * unused entries and grow it if it is full.
  *
  * return:  zero on success or a negative error code
  */
 static int ir_resize_table(struct rc_dev *dev, struct rc_map *rc_map,
                gfp_t gfp_flags)
 {
     unsigned int oldalloc = rc_map->alloc;
     unsigned int newalloc = oldalloc;
     struct rc_map_table *oldscan = rc_map->scan;
     struct rc_map_table *newscan;
 
     if (rc_map->size == rc_map->len) {
         /* All entries in use -> grow keytable */
         if (rc_map->alloc >= IR_TAB_MAX_SIZE)
             return -ENOMEM;
 
         newalloc *= 2;
         dev_dbg(&dev->dev, "Growing table to %u bytes\n", newalloc);
     }
 
     if ((rc_map->len * 3 < rc_map->size) && (oldalloc > IR_TAB_MIN_SIZE)) {
         /* Less than 1/3 of entries in use -> shrink keytable */
         newalloc /= 2;
         dev_dbg(&dev->dev, "Shrinking table to %u bytes\n", newalloc);
     }
 
     if (newalloc == oldalloc)
         return 0;
 
     newscan = kmalloc(newalloc, gfp_flags);
     if (!newscan)
         return -ENOMEM;
 
     memcpy(newscan, rc_map->scan, rc_map->len * sizeof(struct rc_map_table));
     rc_map->scan = newscan;
     rc_map->alloc = newalloc;
     rc_map->size = rc_map->alloc / sizeof(struct rc_map_table);
     kfree(oldscan);
     return 0;
 }
 
 /**
  * ir_update_mapping() - set a keycode in the scancode->keycode table
  * @dev:    the struct rc_dev device descriptor
  * @rc_map: scancode table to be adjusted
  * @index:  index of the mapping that needs to be updated
  * @new_keycode: the desired keycode
  *
  * This routine is used to update scancode->keycode mapping at given
  * position.
  *
  * return:  previous keycode assigned to the mapping
  *
  */
 static unsigned int ir_update_mapping(struct rc_dev *dev,
                       struct rc_map *rc_map,
                       unsigned int index,
                       unsigned int new_keycode)
 {
     int old_keycode = rc_map->scan[index].keycode;
     int i;
 
     /* Did the user wish to remove the mapping? */
     if (new_keycode == KEY_RESERVED || new_keycode == KEY_UNKNOWN) {
         dev_dbg(&dev->dev, "#%d: Deleting scan 0x%04llx\n",
             index, rc_map->scan[index].scancode);
         rc_map->len--;
         memmove(&rc_map->scan[index], &rc_map->scan[index+ 1],
             (rc_map->len - index) * sizeof(struct rc_map_table));
     } else {
         dev_dbg(&dev->dev, "#%d: %s scan 0x%04llx with key 0x%04x\n",
             index,
             old_keycode == KEY_RESERVED ? "New" : "Replacing",
             rc_map->scan[index].scancode, new_keycode);
         rc_map->scan[index].keycode = new_keycode;
         __set_bit(new_keycode, dev->input_dev->keybit);
     }
 
     if (old_keycode != KEY_RESERVED) {
         /* A previous mapping was updated... */
         __clear_bit(old_keycode, dev->input_dev->keybit);
         /* ... but another scancode might use the same keycode */
         for (i = 0; i < rc_map->len; i++) {
             if (rc_map->scan[i].keycode == old_keycode) {
                 __set_bit(old_keycode, dev->input_dev->keybit);
                 break;
             }
         }
 
         /* Possibly shrink the keytable, failure is not a problem */
         ir_resize_table(dev, rc_map, GFP_ATOMIC);
     }
 
     return old_keycode;
 }
 
 /**
  * ir_establish_scancode() - set a keycode in the scancode->keycode table
  * @dev:    the struct rc_dev device descriptor
  * @rc_map: scancode table to be searched
  * @scancode:   the desired scancode
  * @resize: controls whether we allowed to resize the table to
  *      accommodate not yet present scancodes
  *
  * This routine is used to locate given scancode in rc_map.
  * If scancode is not yet present the routine will allocate a new slot
  * for it.
  *
  * return:  index of the mapping containing scancode in question
  *      or -1U in case of failure.
  */
 static unsigned int ir_establish_scancode(struct rc_dev *dev,
                       struct rc_map *rc_map,
                       u64 scancode, bool resize)
 {
     unsigned int i;
 
     /*
      * Unfortunately, some hardware-based IR decoders don't provide
      * all bits for the complete IR code. In general, they provide only
      * the command part of the IR code. Yet, as it is possible to replace
      * the provided IR with another one, it is needed to allow loading
      * IR tables from other remotes. So, we support specifying a mask to
      * indicate the valid bits of the scancodes.
      */
     if (dev->scancode_mask)
         scancode &= dev->scancode_mask;
 
     /* First check if we already have a mapping for this ir command */
     for (i = 0; i < rc_map->len; i++) {
         if (rc_map->scan[i].scancode == scancode)
             return i;
 
         /* Keytable is sorted from lowest to highest scancode */
         if (rc_map->scan[i].scancode >= scancode)
             break;
     }
 
     /* No previous mapping found, we might need to grow the table */
     if (rc_map->size == rc_map->len) {
         if (!resize || ir_resize_table(dev, rc_map, GFP_ATOMIC))
             return -1U;
     }
 
     /* i is the proper index to insert our new keycode */
     if (i < rc_map->len)
         memmove(&rc_map->scan[i + 1], &rc_map->scan[i],
             (rc_map->len - i) * sizeof(struct rc_map_table));
     rc_map->scan[i].scancode = scancode;
     rc_map->scan[i].keycode = KEY_RESERVED;
     rc_map->len++;
 
     return i;
 }
 
 /**
  * ir_setkeycode() - set a keycode in the scancode->keycode table
  * @idev:   the struct input_dev device descriptor
  * @ke:     Input keymap entry
  * @old_keycode: result
  *
  * This routine is used to handle evdev EVIOCSKEY ioctl.
  *
  * return:  -EINVAL if the keycode could not be inserted, otherwise zero.
  */
 static int ir_setkeycode(struct input_dev *idev,
              const struct input_keymap_entry *ke,
              unsigned int *old_keycode)
 {
     struct rc_dev *rdev = input_get_drvdata(idev);
     struct rc_map *rc_map = &rdev->rc_map;
     unsigned int index;
     u64 scancode;
     int retval = 0;
     unsigned long flags;
 
     spin_lock_irqsave(&rc_map->lock, flags);
 
     if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
         index = ke->index;
         if (index >= rc_map->len) {
             retval = -EINVAL;
             goto out;
         }
     } else {
         retval = scancode_to_u64(ke, &scancode);
         if (retval)
             goto out;
 
         index = ir_establish_scancode(rdev, rc_map, scancode, true);
         if (index >= rc_map->len) {
             retval = -ENOMEM;
             goto out;
         }
     }
 
     *old_keycode = ir_update_mapping(rdev, rc_map, index, ke->keycode);
 
 out:
     spin_unlock_irqrestore(&rc_map->lock, flags);
     return retval;
 }
 
 /**
  * ir_setkeytable() - sets several entries in the scancode->keycode table
  * @dev:    the struct rc_dev device descriptor
  * @from:   the struct rc_map to copy entries from
  *
  * This routine is used to handle table initialization.
  *
  * return:  -ENOMEM if all keycodes could not be inserted, otherwise zero.
  */
 static int ir_setkeytable(struct rc_dev *dev, const struct rc_map *from)
 {
     struct rc_map *rc_map = &dev->rc_map;
     unsigned int i, index;
     int rc;
 
     rc = ir_create_table(dev, rc_map, from->name, from->rc_proto,
                  from->size);
     if (rc)
         return rc;
 
     for (i = 0; i < from->size; i++) {
         index = ir_establish_scancode(dev, rc_map,
                           from->scan[i].scancode, false);
         if (index >= rc_map->len) {
             rc = -ENOMEM;
             break;
         }
 
         ir_update_mapping(dev, rc_map, index,
                   from->scan[i].keycode);
     }
 
     if (rc)
         ir_free_table(rc_map);
 
     return rc;
 }
 
 static int rc_map_cmp(const void *key, const void *elt)
 {
     const u64 *scancode = key;
     const struct rc_map_table *e = elt;
 
     if (*scancode < e->scancode)
         return -1;
     else if (*scancode > e->scancode)
         return 1;
     return 0;
 }
 
 /**
  * ir_lookup_by_scancode() - locate mapping by scancode
  * @rc_map: the struct rc_map to search
  * @scancode:   scancode to look for in the table
  *
  * This routine performs binary search in RC keykeymap table for
  * given scancode.
  *
  * return:  index in the table, -1U if not found
  */
 static unsigned int ir_lookup_by_scancode(const struct rc_map *rc_map,
                       u64 scancode)
 {
     struct rc_map_table *res;
 
     res = bsearch(&scancode, rc_map->scan, rc_map->len,
               sizeof(struct rc_map_table), rc_map_cmp);
     if (!res)
         return -1U;
     else
         return res - rc_map->scan;
 }
 
 /**
  * ir_getkeycode() - get a keycode from the scancode->keycode table
  * @idev:   the struct input_dev device descriptor
  * @ke:     Input keymap entry
  *
  * This routine is used to handle evdev EVIOCGKEY ioctl.
  *
  * return:  always returns zero.
  */
 static int ir_getkeycode(struct input_dev *idev,
              struct input_keymap_entry *ke)
 {
     struct rc_dev *rdev = input_get_drvdata(idev);
     struct rc_map *rc_map = &rdev->rc_map;
     struct rc_map_table *entry;
     unsigned long flags;
     unsigned int index;
     u64 scancode;
     int retval;
 
     spin_lock_irqsave(&rc_map->lock, flags);
 
     if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
         index = ke->index;
     } else {
         retval = scancode_to_u64(ke, &scancode);
         if (retval)
             goto out;
 
         index = ir_lookup_by_scancode(rc_map, scancode);
     }
 
     if (index < rc_map->len) {
         entry = &rc_map->scan[index];
 
         ke->index = index;
         ke->keycode = entry->keycode;
         ke->len = sizeof(entry->scancode);
         memcpy(ke->scancode, &entry->scancode, sizeof(entry->scancode));
     } else if (!(ke->flags & INPUT_KEYMAP_BY_INDEX)) {
         /*
          * We do not really know the valid range of scancodes
          * so let's respond with KEY_RESERVED to anything we
          * do not have mapping for [yet].
          */
         ke->index = index;
         ke->keycode = KEY_RESERVED;
     } else {
         retval = -EINVAL;
         goto out;
     }
 
     retval = 0;
 
 out:
     spin_unlock_irqrestore(&rc_map->lock, flags);
     return retval;
 }
 
 /**
  * rc_g_keycode_from_table() - gets the keycode that corresponds to a scancode
  * @dev:    the struct rc_dev descriptor of the device
  * @scancode:   the scancode to look for
  *
  * This routine is used by drivers which need to convert a scancode to a
  * keycode. Normally it should not be used since drivers should have no
  * interest in keycodes.
  *
  * return:  the corresponding keycode, or KEY_RESERVED
  */
 u32 rc_g_keycode_from_table(struct rc_dev *dev, u64 scancode)
 {
     struct rc_map *rc_map = &dev->rc_map;
     unsigned int keycode;
     unsigned int index;
     unsigned long flags;
 
     spin_lock_irqsave(&rc_map->lock, flags);
 
     index = ir_lookup_by_scancode(rc_map, scancode);
     keycode = index < rc_map->len ?
             rc_map->scan[index].keycode : KEY_RESERVED;
 
     spin_unlock_irqrestore(&rc_map->lock, flags);
 
     if (keycode != KEY_RESERVED)
         dev_dbg(&dev->dev, "%s: scancode 0x%04llx keycode 0x%02x\n",
             dev->device_name, scancode, keycode);
 
     return keycode;
 }
 EXPORT_SYMBOL_GPL(rc_g_keycode_from_table);
 
 /**
  * ir_do_keyup() - internal function to signal the release of a keypress
  * @dev:    the struct rc_dev descriptor of the device
  * @sync:   whether or not to call input_sync
  *
  * This function is used internally to release a keypress, it must be
  * called with keylock held.
  */
 static void ir_do_keyup(struct rc_dev *dev, bool sync)
 {
     if (!dev->keypressed)
         return;
 
     dev_dbg(&dev->dev, "keyup key 0x%04x\n", dev->last_keycode);
     del_timer(&dev->timer_repeat);
     input_report_key(dev->input_dev, dev->last_keycode, 0);
     led_trigger_event(led_feedback, LED_OFF);
     if (sync)
         input_sync(dev->input_dev);
     dev->keypressed = false;
 }
 
 /**
  * rc_keyup() - signals the release of a keypress
  * @dev:    the struct rc_dev descriptor of the device
  *
  * This routine is used to signal that a key has been released on the
  * remote control.
  */
 void rc_keyup(struct rc_dev *dev)
 {
     unsigned long flags;
 
     spin_lock_irqsave(&dev->keylock, flags);
     ir_do_keyup(dev, true);
     spin_unlock_irqrestore(&dev->keylock, flags);
 }
 EXPORT_SYMBOL_GPL(rc_keyup);
 
 /**
  * ir_timer_keyup() - generates a keyup event after a timeout
  *
  * @t:      a pointer to the struct timer_list
  *
  * This routine will generate a keyup event some time after a keydown event
  * is generated when no further activity has been detected.
  */
 static void ir_timer_keyup(struct timer_list *t)
 {
     struct rc_dev *dev = from_timer(dev, t, timer_keyup);
     unsigned long flags;
 
     /*
      * ir->keyup_jiffies is used to prevent a race condition if a
      * hardware interrupt occurs at this point and the keyup timer
      * event is moved further into the future as a result.
      *
      * The timer will then be reactivated and this function called
      * again in the future. We need to exit gracefully in that case
      * to allow the input subsystem to do its auto-repeat magic or
      * a keyup event might follow immediately after the keydown.
      */
     spin_lock_irqsave(&dev->keylock, flags);
     if (time_is_before_eq_jiffies(dev->keyup_jiffies))
         ir_do_keyup(dev, true);
     spin_unlock_irqrestore(&dev->keylock, flags);
 }
 
 /**
  * ir_timer_repeat() - generates a repeat event after a timeout
  *
  * @t:      a pointer to the struct timer_list
  *
  * This routine will generate a soft repeat event every REP_PERIOD
  * milliseconds.
  */
 static void ir_timer_repeat(struct timer_list *t)
 {
     struct rc_dev *dev = from_timer(dev, t, timer_repeat);
     struct input_dev *input = dev->input_dev;
     unsigned long flags;
 
     spin_lock_irqsave(&dev->keylock, flags);
     if (dev->keypressed) {
         input_event(input, EV_KEY, dev->last_keycode, 2);
         input_sync(input);
         if (input->rep[REP_PERIOD])
             mod_timer(&dev->timer_repeat, jiffies +
                   msecs_to_jiffies(input->rep[REP_PERIOD]));
     }
     spin_unlock_irqrestore(&dev->keylock, flags);
 }
 
 static unsigned int repeat_period(int protocol)
 {
     if (protocol >= ARRAY_SIZE(protocols))
         return 100;
 
     return protocols[protocol].repeat_period;
 }
 
 /**
  * rc_repeat() - signals that a key is still pressed
  * @dev:    the struct rc_dev descriptor of the device
  *
  * This routine is used by IR decoders when a repeat message which does
  * not include the necessary bits to reproduce the scancode has been
  * received.
  */
 void rc_repeat(struct rc_dev *dev)
 {
     unsigned long flags;
     unsigned int timeout = usecs_to_jiffies(dev->timeout) +
         msecs_to_jiffies(repeat_period(dev->last_protocol));
     struct lirc_scancode sc = {
         .scancode = dev->last_scancode, .rc_proto = dev->last_protocol,
         .keycode = dev->keypressed ? dev->last_keycode : KEY_RESERVED,
         .flags = LIRC_SCANCODE_FLAG_REPEAT |
              (dev->last_toggle ? LIRC_SCANCODE_FLAG_TOGGLE : 0)
     };
 
     if (dev->allowed_protocols != RC_PROTO_BIT_CEC)
         lirc_scancode_event(dev, &sc);
 
     spin_lock_irqsave(&dev->keylock, flags);
 
     if (dev->last_scancode <= U32_MAX) {
         input_event(dev->input_dev, EV_MSC, MSC_SCAN,
                 dev->last_scancode);
         input_sync(dev->input_dev);
     }
 
     if (dev->keypressed) {
         dev->keyup_jiffies = jiffies + timeout;
         mod_timer(&dev->timer_keyup, dev->keyup_jiffies);
     }
 
     spin_unlock_irqrestore(&dev->keylock, flags);
 }
 EXPORT_SYMBOL_GPL(rc_repeat);
 
 /**
  * ir_do_keydown() - internal function to process a keypress
  * @dev:    the struct rc_dev descriptor of the device
  * @protocol:   the protocol of the keypress
  * @scancode:   the scancode of the keypress
  * @keycode:    the keycode of the keypress
  * @toggle:     the toggle value of the keypress
  *
  * This function is used internally to register a keypress, it must be
  * called with keylock held.
  */
 static void ir_do_keydown(struct rc_dev *dev, enum rc_proto protocol,
               u64 scancode, u32 keycode, u8 toggle)
 {
     bool new_event = (!dev->keypressed       ||
               dev->last_protocol != protocol ||
               dev->last_scancode != scancode ||
               dev->last_toggle   != toggle);
     struct lirc_scancode sc = {
         .scancode = scancode, .rc_proto = protocol,
         .flags = (toggle ? LIRC_SCANCODE_FLAG_TOGGLE : 0) |
              (!new_event ? LIRC_SCANCODE_FLAG_REPEAT : 0),
         .keycode = keycode
     };
 
     if (dev->allowed_protocols != RC_PROTO_BIT_CEC)
         lirc_scancode_event(dev, &sc);
 
     if (new_event && dev->keypressed)
         ir_do_keyup(dev, false);
 
     if (scancode <= U32_MAX)
         input_event(dev->input_dev, EV_MSC, MSC_SCAN, scancode);
 
     dev->last_protocol = protocol;
     dev->last_scancode = scancode;
     dev->last_toggle = toggle;
     dev->last_keycode = keycode;
 
     if (new_event && keycode != KEY_RESERVED) {
         /* Register a keypress */
         dev->keypressed = true;
 
         dev_dbg(&dev->dev, "%s: key down event, key 0x%04x, protocol 0x%04x, scancode 0x%08llx\n",
             dev->device_name, keycode, protocol, scancode);
         input_report_key(dev->input_dev, keycode, 1);
 
         led_trigger_event(led_feedback, LED_FULL);
     }
 
     /*
      * For CEC, start sending repeat messages as soon as the first
      * repeated message is sent, as long as REP_DELAY = 0 and REP_PERIOD
      * is non-zero. Otherwise, the input layer will generate repeat
      * messages.
      */
     if (!new_event && keycode != KEY_RESERVED &&
         dev->allowed_protocols == RC_PROTO_BIT_CEC &&
         !timer_pending(&dev->timer_repeat) &&
         dev->input_dev->rep[REP_PERIOD] &&
         !dev->input_dev->rep[REP_DELAY]) {
         input_event(dev->input_dev, EV_KEY, keycode, 2);
         mod_timer(&dev->timer_repeat, jiffies +
               msecs_to_jiffies(dev->input_dev->rep[REP_PERIOD]));
     }
 
     input_sync(dev->input_dev);
 }
 
 /**
  * rc_keydown() - generates input event for a key press
  * @dev:    the struct rc_dev descriptor of the device
  * @protocol:   the protocol for the keypress
  * @scancode:   the scancode for the keypress
  * @toggle:     the toggle value (protocol dependent, if the protocol doesn't
  *              support toggle values, this should be set to zero)
  *
  * This routine is used to signal that a key has been pressed on the
  * remote control.
  */
 void rc_keydown(struct rc_dev *dev, enum rc_proto protocol, u64 scancode,
         u8 toggle)
 {
     unsigned long flags;
     u32 keycode = rc_g_keycode_from_table(dev, scancode);
 
     spin_lock_irqsave(&dev->keylock, flags);
     ir_do_keydown(dev, protocol, scancode, keycode, toggle);
 
     if (dev->keypressed) {
         dev->keyup_jiffies = jiffies + usecs_to_jiffies(dev->timeout) +
             msecs_to_jiffies(repeat_period(protocol));
         mod_timer(&dev->timer_keyup, dev->keyup_jiffies);
     }
     spin_unlock_irqrestore(&dev->keylock, flags);
 }
 EXPORT_SYMBOL_GPL(rc_keydown);
 
 /**
  * rc_keydown_notimeout() - generates input event for a key press without
  *                          an automatic keyup event at a later time
  * @dev:    the struct rc_dev descriptor of the device
  * @protocol:   the protocol for the keypress
  * @scancode:   the scancode for the keypress
  * @toggle:     the toggle value (protocol dependent, if the protocol doesn't
  *              support toggle values, this should be set to zero)
  *
  * This routine is used to signal that a key has been pressed on the
  * remote control. The driver must manually call rc_keyup() at a later stage.
  */
 void rc_keydown_notimeout(struct rc_dev *dev, enum rc_proto protocol,
               u64 scancode, u8 toggle)
 {
     unsigned long flags;
     u32 keycode = rc_g_keycode_from_table(dev, scancode);
 
     spin_lock_irqsave(&dev->keylock, flags);
     ir_do_keydown(dev, protocol, scancode, keycode, toggle);
     spin_unlock_irqrestore(&dev->keylock, flags);
 }
 EXPORT_SYMBOL_GPL(rc_keydown_notimeout);
 
 /**
  * rc_validate_scancode() - checks that a scancode is valid for a protocol.
  *  For nec, it should do the opposite of ir_nec_bytes_to_scancode()
  * @proto:  protocol
  * @scancode:   scancode
  */
 bool rc_validate_scancode(enum rc_proto proto, u32 scancode)
 {
     switch (proto) {
     /*
      * NECX has a 16-bit address; if the lower 8 bits match the upper
      * 8 bits inverted, then the address would match regular nec.
      */
     case RC_PROTO_NECX:
         if ((((scancode >> 16) ^ ~(scancode >> 8)) & 0xff) == 0)
             return false;
         break;
     /*
      * NEC32 has a 16 bit address and 16 bit command. If the lower 8 bits
      * of the command match the upper 8 bits inverted, then it would
      * be either NEC or NECX.
      */
     case RC_PROTO_NEC32:
         if ((((scancode >> 8) ^ ~scancode) & 0xff) == 0)
             return false;
         break;
     /*
      * If the customer code (top 32-bit) is 0x800f, it is MCE else it
      * is regular mode-6a 32 bit
      */
     case RC_PROTO_RC6_MCE:
         if ((scancode & 0xffff0000) != 0x800f0000)
             return false;
         break;
     case RC_PROTO_RC6_6A_32:
         if ((scancode & 0xffff0000) == 0x800f0000)
             return false;
         break;
     default:
         break;
     }
 
     return true;
 }
 
 /**
  * rc_validate_filter() - checks that the scancode and mask are valid and
  *            provides sensible defaults
  * @dev:    the struct rc_dev descriptor of the device
  * @filter: the scancode and mask
  *
  * return:  0 or -EINVAL if the filter is not valid
  */
 static int rc_validate_filter(struct rc_dev *dev,
                   struct rc_scancode_filter *filter)
 {
     u32 mask, s = filter->data;
     enum rc_proto protocol = dev->wakeup_protocol;
 
     if (protocol >= ARRAY_SIZE(protocols))
         return -EINVAL;
 
     mask = protocols[protocol].scancode_bits;
 
     if (!rc_validate_scancode(protocol, s))
         return -EINVAL;
 
     filter->data &= mask;
     filter->mask &= mask;
 
     /*
      * If we have to raw encode the IR for wakeup, we cannot have a mask
      */
     if (dev->encode_wakeup && filter->mask != 0 && filter->mask != mask)
         return -EINVAL;
 
     return 0;
 }
 
 int rc_open(struct rc_dev *rdev)
 {
     int rval = 0;
 
     if (!rdev)
         return -EINVAL;
 
     mutex_lock(&rdev->lock);
 
     if (!rdev->registered) {
         rval = -ENODEV;
     } else {
         if (!rdev->users++ && rdev->open)
             rval = rdev->open(rdev);
 
         if (rval)
             rdev->users--;
     }
 
     mutex_unlock(&rdev->lock);
 
     return rval;
 }
 
 static int ir_open(struct input_dev *idev)
 {
     struct rc_dev *rdev = input_get_drvdata(idev);
 
     return rc_open(rdev);
 }
 
 void rc_close(struct rc_dev *rdev)
 {
     if (rdev) {
         mutex_lock(&rdev->lock);
 
         if (!--rdev->users && rdev->close && rdev->registered)
             rdev->close(rdev);
 
         mutex_unlock(&rdev->lock);
     }
 }
 
 static void ir_close(struct input_dev *idev)
 {
     struct rc_dev *rdev = input_get_drvdata(idev);
     rc_close(rdev);
 }
 
 /* class for /sys/class/rc */
 static char *rc_devnode(struct device *dev, umode_t *mode)
 {
     return kasprintf(GFP_KERNEL, "rc/%s", dev_name(dev));
 }
 
 static struct class rc_class = {
     .name       = "rc",
     .devnode    = rc_devnode,
 };
 
 /*
  * These are the protocol textual descriptions that are
  * used by the sysfs protocols file. Note that the order
  * of the entries is relevant.
  */
 static const struct {
     u64 type;
     const char  *name;
     const char  *module_name;
 } proto_names[] = {
     { RC_PROTO_BIT_NONE,    "none",     NULL            },
     { RC_PROTO_BIT_OTHER,   "other",    NULL            },
     { RC_PROTO_BIT_UNKNOWN, "unknown",  NULL            },
     { RC_PROTO_BIT_RC5 |
       RC_PROTO_BIT_RC5X_20, "rc-5",     "ir-rc5-decoder"    },
     { RC_PROTO_BIT_NEC |
       RC_PROTO_BIT_NECX |
       RC_PROTO_BIT_NEC32,   "nec",      "ir-nec-decoder"    },
     { RC_PROTO_BIT_RC6_0 |
       RC_PROTO_BIT_RC6_6A_20 |
       RC_PROTO_BIT_RC6_6A_24 |
       RC_PROTO_BIT_RC6_6A_32 |
       RC_PROTO_BIT_RC6_MCE, "rc-6",     "ir-rc6-decoder"    },
     { RC_PROTO_BIT_JVC, "jvc",      "ir-jvc-decoder"    },
     { RC_PROTO_BIT_SONY12 |
       RC_PROTO_BIT_SONY15 |
       RC_PROTO_BIT_SONY20,  "sony",     "ir-sony-decoder"   },
     { RC_PROTO_BIT_RC5_SZ,  "rc-5-sz",  "ir-rc5-decoder"    },
     { RC_PROTO_BIT_SANYO,   "sanyo",    "ir-sanyo-decoder"  },
     { RC_PROTO_BIT_SHARP,   "sharp",    "ir-sharp-decoder"  },
     { RC_PROTO_BIT_MCIR2_KBD |
       RC_PROTO_BIT_MCIR2_MSE, "mce_kbd",    "ir-mce_kbd-decoder"    },
     { RC_PROTO_BIT_XMP, "xmp",      "ir-xmp-decoder"    },
     { RC_PROTO_BIT_CEC, "cec",      NULL            },
     { RC_PROTO_BIT_IMON,    "imon",     "ir-imon-decoder"   },
     { RC_PROTO_BIT_RCMM12 |
       RC_PROTO_BIT_RCMM24 |
       RC_PROTO_BIT_RCMM32,  "rc-mm",    "ir-rcmm-decoder"   },
     { RC_PROTO_BIT_XBOX_DVD, "xbox-dvd",    NULL            },
 };
 
 /**
  * struct rc_filter_attribute - Device attribute relating to a filter type.
  * @attr:   Device attribute.
  * @type:   Filter type.
  * @mask:   false for filter value, true for filter mask.
  */
 struct rc_filter_attribute {
     struct device_attribute     attr;
     enum rc_filter_type     type;
     bool                mask;
 };
 #define to_rc_filter_attr(a) container_of(a, struct rc_filter_attribute, attr)
 
 #define RC_FILTER_ATTR(_name, _mode, _show, _store, _type, _mask)   \
     struct rc_filter_attribute dev_attr_##_name = {         \
         .attr = __ATTR(_name, _mode, _show, _store),        \
         .type = (_type),                    \
         .mask = (_mask),                    \
     }
 
 /**
  * show_protocols() - shows the current IR protocol(s)
  * @device: the device descriptor
  * @mattr:  the device attribute struct
  * @buf:    a pointer to the output buffer
  *
  * This routine is a callback routine for input read the IR protocol type(s).
  * it is triggered by reading /sys/class/rc/rc?/protocols.
  * It returns the protocol names of supported protocols.
  * Enabled protocols are printed in brackets.
  *
  * dev->lock is taken to guard against races between
  * store_protocols and show_protocols.
  */
 static ssize_t show_protocols(struct device *device,
                   struct device_attribute *mattr, char *buf)
 {
     struct rc_dev *dev = to_rc_dev(device);
     u64 allowed, enabled;
     char *tmp = buf;
     int i;
 
     mutex_lock(&dev->lock);
 
     enabled = dev->enabled_protocols;
     allowed = dev->allowed_protocols;
     if (dev->raw && !allowed)
         allowed = ir_raw_get_allowed_protocols();
 
     mutex_unlock(&dev->lock);
 
     dev_dbg(&dev->dev, "%s: allowed - 0x%llx, enabled - 0x%llx\n",
         __func__, (long long)allowed, (long long)enabled);
 
     for (i = 0; i < ARRAY_SIZE(proto_names); i++) {
         if (allowed & enabled & proto_names[i].type)
             tmp += sprintf(tmp, "[%s] ", proto_names[i].name);
         else if (allowed & proto_names[i].type)
             tmp += sprintf(tmp, "%s ", proto_names[i].name);
 
         if (allowed & proto_names[i].type)
             allowed &= ~proto_names[i].type;
     }
 
 #ifdef CONFIG_LIRC
     if (dev->driver_type == RC_DRIVER_IR_RAW)
         tmp += sprintf(tmp, "[lirc] ");
 #endif
 
     if (tmp != buf)
         tmp--;
     *tmp = '\n';
 
     return tmp + 1 - buf;
 }
 
 /**
  * parse_protocol_change() - parses a protocol change request
  * @dev:    rc_dev device
  * @protocols:  pointer to the bitmask of current protocols
  * @buf:    pointer to the buffer with a list of changes
  *
  * Writing "+proto" will add a protocol to the protocol mask.
  * Writing "-proto" will remove a protocol from protocol mask.
  * Writing "proto" will enable only "proto".
  * Writing "none" will disable all protocols.
  * Returns the number of changes performed or a negative error code.
  */
 static int parse_protocol_change(struct rc_dev *dev, u64 *protocols,
                  const char *buf)
 {
     const char *tmp;
     unsigned count = 0;
     bool enable, disable;
     u64 mask;
     int i;
 
     while ((tmp = strsep((char **)&buf, " \n")) != NULL) {
         if (!*tmp)
             break;
 
         if (*tmp == '+') {
             enable = true;
             disable = false;
             tmp++;
         } else if (*tmp == '-') {
             enable = false;
             disable = true;
             tmp++;
         } else {
             enable = false;
             disable = false;
         }
 
         for (i = 0; i < ARRAY_SIZE(proto_names); i++) {
             if (!strcasecmp(tmp, proto_names[i].name)) {
                 mask = proto_names[i].type;
                 break;
             }
         }
 
         if (i == ARRAY_SIZE(proto_names)) {
             if (!strcasecmp(tmp, "lirc"))
                 mask = 0;
             else {
                 dev_dbg(&dev->dev, "Unknown protocol: '%s'\n",
                     tmp);
                 return -EINVAL;
             }
         }
 
         count++;
 
         if (enable)
             *protocols |= mask;
         else if (disable)
             *protocols &= ~mask;
         else
             *protocols = mask;
     }
 
     if (!count) {
         dev_dbg(&dev->dev, "Protocol not specified\n");
         return -EINVAL;
     }
 
     return count;
 }
 
 void ir_raw_load_modules(u64 *protocols)
 {
     u64 available;
     int i, ret;
 
     for (i = 0; i < ARRAY_SIZE(proto_names); i++) {
         if (proto_names[i].type == RC_PROTO_BIT_NONE ||
             proto_names[i].type & (RC_PROTO_BIT_OTHER |
                        RC_PROTO_BIT_UNKNOWN))
             continue;
 
         available = ir_raw_get_allowed_protocols();
         if (!(*protocols & proto_names[i].type & ~available))
             continue;
 
         if (!proto_names[i].module_name) {
             pr_err("Can't enable IR protocol %s\n",
                    proto_names[i].name);
             *protocols &= ~proto_names[i].type;
             continue;
         }
 
         ret = request_module("%s", proto_names[i].module_name);
         if (ret < 0) {
             pr_err("Couldn't load IR protocol module %s\n",
                    proto_names[i].module_name);
             *protocols &= ~proto_names[i].type;
             continue;
         }
         msleep(20);
         available = ir_raw_get_allowed_protocols();
         if (!(*protocols & proto_names[i].type & ~available))
             continue;
 
         pr_err("Loaded IR protocol module %s, but protocol %s still not available\n",
                proto_names[i].module_name,
                proto_names[i].name);
         *protocols &= ~proto_names[i].type;
     }
 }
 
 /**
  * store_protocols() - changes the current/wakeup IR protocol(s)
  * @device: the device descriptor
  * @mattr:  the device attribute struct
  * @buf:    a pointer to the input buffer
  * @len:    length of the input buffer
  *
  * This routine is for changing the IR protocol type.
  * It is triggered by writing to /sys/class/rc/rc?/[wakeup_]protocols.
  * See parse_protocol_change() for the valid commands.
  * Returns @len on success or a negative error code.
  *
  * dev->lock is taken to guard against races between
  * store_protocols and show_protocols.
  */
 static ssize_t store_protocols(struct device *device,
                    struct device_attribute *mattr,
                    const char *buf, size_t len)
 {
     struct rc_dev *dev = to_rc_dev(device);
     u64 *current_protocols;
     struct rc_scancode_filter *filter;
     u64 old_protocols, new_protocols;
     ssize_t rc;
 
     dev_dbg(&dev->dev, "Normal protocol change requested\n");
     current_protocols = &dev->enabled_protocols;
     filter = &dev->scancode_filter;
 
     if (!dev->change_protocol) {
         dev_dbg(&dev->dev, "Protocol switching not supported\n");
         return -EINVAL;
     }
 
     mutex_lock(&dev->lock);
     if (!dev->registered) {
         mutex_unlock(&dev->lock);
         return -ENODEV;
     }
 
     old_protocols = *current_protocols;
     new_protocols = old_protocols;
     rc = parse_protocol_change(dev, &new_protocols, buf);
     if (rc < 0)
         goto out;
 
     if (dev->driver_type == RC_DRIVER_IR_RAW)
         ir_raw_load_modules(&new_protocols);
 
     rc = dev->change_protocol(dev, &new_protocols);
     if (rc < 0) {
         dev_dbg(&dev->dev, "Error setting protocols to 0x%llx\n",
             (long long)new_protocols);
         goto out;
     }
 
     if (new_protocols != old_protocols) {
         *current_protocols = new_protocols;
         dev_dbg(&dev->dev, "Protocols changed to 0x%llx\n",
             (long long)new_protocols);
     }
 
     /*
      * If a protocol change was attempted the filter may need updating, even
      * if the actual protocol mask hasn't changed (since the driver may have
      * cleared the filter).
      * Try setting the same filter with the new protocol (if any).
      * Fall back to clearing the filter.
      */
     if (dev->s_filter && filter->mask) {
         if (new_protocols)
             rc = dev->s_filter(dev, filter);
         else
             rc = -1;
 
         if (rc < 0) {
             filter->data = 0;
             filter->mask = 0;
             dev->s_filter(dev, filter);
         }
     }
 
     rc = len;
 
 out:
     mutex_unlock(&dev->lock);
     return rc;
 }
 
 /**
  * show_filter() - shows the current scancode filter value or mask
  * @device: the device descriptor
  * @attr:   the device attribute struct
  * @buf:    a pointer to the output buffer
  *
  * This routine is a callback routine to read a scancode filter value or mask.
  * It is triggered by reading /sys/class/rc/rc?/[wakeup_]filter[_mask].
  * It prints the current scancode filter value or mask of the appropriate filter
  * type in hexadecimal into @buf and returns the size of the buffer.
  *
  * Bits of the filter value corresponding to set bits in the filter mask are
  * compared against input scancodes and non-matching scancodes are discarded.
  *
  * dev->lock is taken to guard against races between
  * store_filter and show_filter.
  */
 static ssize_t show_filter(struct device *device,
                struct device_attribute *attr,
                char *buf)
 {
     struct rc_dev *dev = to_rc_dev(device);
     struct rc_filter_attribute *fattr = to_rc_filter_attr(attr);
     struct rc_scancode_filter *filter;
     u32 val;
 
     mutex_lock(&dev->lock);
 
     if (fattr->type == RC_FILTER_NORMAL)
         filter = &dev->scancode_filter;
     else
         filter = &dev->scancode_wakeup_filter;
 
     if (fattr->mask)
         val = filter->mask;
     else
         val = filter->data;
     mutex_unlock(&dev->lock);
 
     return sprintf(buf, "%#x\n", val);
 }
 
 /**
  * store_filter() - changes the scancode filter value
  * @device: the device descriptor
  * @attr:   the device attribute struct
  * @buf:    a pointer to the input buffer
  * @len:    length of the input buffer
  *
  * This routine is for changing a scancode filter value or mask.
  * It is triggered by writing to /sys/class/rc/rc?/[wakeup_]filter[_mask].
  * Returns -EINVAL if an invalid filter value for the current protocol was
  * specified or if scancode filtering is not supported by the driver, otherwise
  * returns @len.
  *
  * Bits of the filter value corresponding to set bits in the filter mask are
  * compared against input scancodes and non-matching scancodes are discarded.
  *
  * dev->lock is taken to guard against races between
  * store_filter and show_filter.
  */
 static ssize_t store_filter(struct device *device,
                 struct device_attribute *attr,
                 const char *buf, size_t len)
 {
     struct rc_dev *dev = to_rc_dev(device);
     struct rc_filter_attribute *fattr = to_rc_filter_attr(attr);
     struct rc_scancode_filter new_filter, *filter;
     int ret;
     unsigned long val;
     int (*set_filter)(struct rc_dev *dev, struct rc_scancode_filter *filter);
 
     ret = kstrtoul(buf, 0, &val);
     if (ret < 0)
         return ret;
 
     if (fattr->type == RC_FILTER_NORMAL) {
         set_filter = dev->s_filter;
         filter = &dev->scancode_filter;
     } else {
         set_filter = dev->s_wakeup_filter;
         filter = &dev->scancode_wakeup_filter;
     }
 
     if (!set_filter)
         return -EINVAL;
 
     mutex_lock(&dev->lock);
     if (!dev->registered) {
         mutex_unlock(&dev->lock);
         return -ENODEV;
     }
 
     new_filter = *filter;
     if (fattr->mask)
         new_filter.mask = val;
     else
         new_filter.data = val;
 
     if (fattr->type == RC_FILTER_WAKEUP) {
         /*
          * Refuse to set a filter unless a protocol is enabled
          * and the filter is valid for that protocol
          */
         if (dev->wakeup_protocol != RC_PROTO_UNKNOWN)
             ret = rc_validate_filter(dev, &new_filter);
         else
             ret = -EINVAL;
 
         if (ret != 0)
             goto unlock;
     }
 
     if (fattr->type == RC_FILTER_NORMAL && !dev->enabled_protocols &&
         val) {
         /* refuse to set a filter unless a protocol is enabled */
         ret = -EINVAL;
         goto unlock;
     }
 
     ret = set_filter(dev, &new_filter);
     if (ret < 0)
         goto unlock;
 
     *filter = new_filter;
 
 unlock:
     mutex_unlock(&dev->lock);
     return (ret < 0) ? ret : len;
 }
 
 /**
  * show_wakeup_protocols() - shows the wakeup IR protocol
  * @device: the device descriptor
  * @mattr:  the device attribute struct
  * @buf:    a pointer to the output buffer
  *
  * This routine is a callback routine for input read the IR protocol type(s).
  * it is triggered by reading /sys/class/rc/rc?/wakeup_protocols.
  * It returns the protocol names of supported protocols.
  * The enabled protocols are printed in brackets.
  *
  * dev->lock is taken to guard against races between
  * store_wakeup_protocols and show_wakeup_protocols.
  */
 static ssize_t show_wakeup_protocols(struct device *device,
                      struct device_attribute *mattr,
                      char *buf)
 {
     struct rc_dev *dev = to_rc_dev(device);
     u64 allowed;
     enum rc_proto enabled;
     char *tmp = buf;
     int i;
 
     mutex_lock(&dev->lock);
 
     allowed = dev->allowed_wakeup_protocols;
     enabled = dev->wakeup_protocol;
 
     mutex_unlock(&dev->lock);
 
     dev_dbg(&dev->dev, "%s: allowed - 0x%llx, enabled - %d\n",
         __func__, (long long)allowed, enabled);
 
     for (i = 0; i < ARRAY_SIZE(protocols); i++) {
         if (allowed & (1ULL << i)) {
             if (i == enabled)
                 tmp += sprintf(tmp, "[%s] ", protocols[i].name);
             else
                 tmp += sprintf(tmp, "%s ", protocols[i].name);
         }
     }
 
     if (tmp != buf)
         tmp--;
     *tmp = '\n';
 
     return tmp + 1 - buf;
 }
 
 /**
  * store_wakeup_protocols() - changes the wakeup IR protocol(s)
  * @device: the device descriptor
  * @mattr:  the device attribute struct
  * @buf:    a pointer to the input buffer
  * @len:    length of the input buffer
  *
  * This routine is for changing the IR protocol type.
  * It is triggered by writing to /sys/class/rc/rc?/wakeup_protocols.
  * Returns @len on success or a negative error code.
  *
  * dev->lock is taken to guard against races between
  * store_wakeup_protocols and show_wakeup_protocols.
  */
 static ssize_t store_wakeup_protocols(struct device *device,
                       struct device_attribute *mattr,
                       const char *buf, size_t len)
 {
     struct rc_dev *dev = to_rc_dev(device);
     enum rc_proto protocol = RC_PROTO_UNKNOWN;
     ssize_t rc;
     u64 allowed;
     int i;
 
     mutex_lock(&dev->lock);
     if (!dev->registered) {
         mutex_unlock(&dev->lock);
         return -ENODEV;
     }
 
     allowed = dev->allowed_wakeup_protocols;
 
     if (!sysfs_streq(buf, "none")) {
         for (i = 0; i < ARRAY_SIZE(protocols); i++) {
             if ((allowed & (1ULL << i)) &&
                 sysfs_streq(buf, protocols[i].name)) {
                 protocol = i;
                 break;
             }
         }
 
         if (i == ARRAY_SIZE(protocols)) {
             rc = -EINVAL;
             goto out;
         }
 
         if (dev->encode_wakeup) {
             u64 mask = 1ULL << protocol;
 
             ir_raw_load_modules(&mask);
             if (!mask) {
                 rc = -EINVAL;
                 goto out;
             }
         }
     }
 
     if (dev->wakeup_protocol != protocol) {
         dev->wakeup_protocol = protocol;
         dev_dbg(&dev->dev, "Wakeup protocol changed to %d\n", protocol);
 
         if (protocol == RC_PROTO_RC6_MCE)
             dev->scancode_wakeup_filter.data = 0x800f0000;
         else
             dev->scancode_wakeup_filter.data = 0;
         dev->scancode_wakeup_filter.mask = 0;
 
         rc = dev->s_wakeup_filter(dev, &dev->scancode_wakeup_filter);
         if (rc == 0)
             rc = len;
     } else {
         rc = len;
     }
 
 out:
     mutex_unlock(&dev->lock);
     return rc;
 }
 
 static void rc_dev_release(struct device *device)
 {
     struct rc_dev *dev = to_rc_dev(device);
 
     kfree(dev);
 }
 
 static int rc_dev_uevent(struct device *device, struct kobj_uevent_env *env)
 {
     struct rc_dev *dev = to_rc_dev(device);
     int ret = 0;
 
     mutex_lock(&dev->lock);
 
     if (!dev->registered)
         ret = -ENODEV;
     if (ret == 0 && dev->rc_map.name)
         ret = add_uevent_var(env, "NAME=%s", dev->rc_map.name);
     if (ret == 0 && dev->driver_name)
         ret = add_uevent_var(env, "DRV_NAME=%s", dev->driver_name);
     if (ret == 0 && dev->device_name)
         ret = add_uevent_var(env, "DEV_NAME=%s", dev->device_name);
 
     mutex_unlock(&dev->lock);
 
     return ret;
 }
 
 /*
  * Static device attribute struct with the sysfs attributes for IR's
  */
 static struct device_attribute dev_attr_ro_protocols =
 __ATTR(protocols, 0444, show_protocols, NULL);
 static struct device_attribute dev_attr_rw_protocols =
 __ATTR(protocols, 0644, show_protocols, store_protocols);
 static DEVICE_ATTR(wakeup_protocols, 0644, show_wakeup_protocols,
            store_wakeup_protocols);
 static RC_FILTER_ATTR(filter, S_IRUGO|S_IWUSR,
               show_filter, store_filter, RC_FILTER_NORMAL, false);
 static RC_FILTER_ATTR(filter_mask, S_IRUGO|S_IWUSR,
               show_filter, store_filter, RC_FILTER_NORMAL, true);
 static RC_FILTER_ATTR(wakeup_filter, S_IRUGO|S_IWUSR,
               show_filter, store_filter, RC_FILTER_WAKEUP, false);
 static RC_FILTER_ATTR(wakeup_filter_mask, S_IRUGO|S_IWUSR,
               show_filter, store_filter, RC_FILTER_WAKEUP, true);
 
 static struct attribute *rc_dev_rw_protocol_attrs[] = {
     &dev_attr_rw_protocols.attr,
     NULL,
 };
 
 static const struct attribute_group rc_dev_rw_protocol_attr_grp = {
     .attrs  = rc_dev_rw_protocol_attrs,
 };
 
 static struct attribute *rc_dev_ro_protocol_attrs[] = {
     &dev_attr_ro_protocols.attr,
     NULL,
 };
 
 static const struct attribute_group rc_dev_ro_protocol_attr_grp = {
     .attrs  = rc_dev_ro_protocol_attrs,
 };
 
 static struct attribute *rc_dev_filter_attrs[] = {
     &dev_attr_filter.attr.attr,
     &dev_attr_filter_mask.attr.attr,
     NULL,
 };
 
 static const struct attribute_group rc_dev_filter_attr_grp = {
     .attrs  = rc_dev_filter_attrs,
 };
 
 static struct attribute *rc_dev_wakeup_filter_attrs[] = {
     &dev_attr_wakeup_filter.attr.attr,
     &dev_attr_wakeup_filter_mask.attr.attr,
     &dev_attr_wakeup_protocols.attr,
     NULL,
 };
 
 static const struct attribute_group rc_dev_wakeup_filter_attr_grp = {
     .attrs  = rc_dev_wakeup_filter_attrs,
 };
 
 static const struct device_type rc_dev_type = {
     .release    = rc_dev_release,
     .uevent     = rc_dev_uevent,
 };
 
 struct rc_dev *rc_allocate_device(enum rc_driver_type type)
 {
     struct rc_dev *dev;
 
     dev = kzalloc(sizeof(*dev), GFP_KERNEL);
     if (!dev)
         return NULL;
 
     if (type != RC_DRIVER_IR_RAW_TX) {
         dev->input_dev = input_allocate_device();
         if (!dev->input_dev) {
             kfree(dev);
             return NULL;
         }
 
         dev->input_dev->getkeycode = ir_getkeycode;
         dev->input_dev->setkeycode = ir_setkeycode;
         input_set_drvdata(dev->input_dev, dev);
 
         dev->timeout = IR_DEFAULT_TIMEOUT;
         timer_setup(&dev->timer_keyup, ir_timer_keyup, 0);
         timer_setup(&dev->timer_repeat, ir_timer_repeat, 0);
 
         spin_lock_init(&dev->rc_map.lock);
         spin_lock_init(&dev->keylock);
     }
     mutex_init(&dev->lock);
 
     dev->dev.type = &rc_dev_type;
     dev->dev.class = &rc_class;
     device_initialize(&dev->dev);
 
     dev->driver_type = type;
 
     __module_get(THIS_MODULE);
     return dev;
 }
 EXPORT_SYMBOL_GPL(rc_allocate_device);
 
 void rc_free_device(struct rc_dev *dev)
 {
     if (!dev)
         return;
 
     input_free_device(dev->input_dev);
 
     put_device(&dev->dev);
 
     /* kfree(dev) will be called by the callback function
        rc_dev_release() */
 
     module_put(THIS_MODULE);
 }
 EXPORT_SYMBOL_GPL(rc_free_device);
 
 static void devm_rc_alloc_release(struct device *dev, void *res)
 {
     rc_free_device(*(struct rc_dev **)res);
 }
 
 struct rc_dev *devm_rc_allocate_device(struct device *dev,
                        enum rc_driver_type type)
 {
     struct rc_dev **dr, *rc;
 
     dr = devres_alloc(devm_rc_alloc_release, sizeof(*dr), GFP_KERNEL);
     if (!dr)
         return NULL;
 
     rc = rc_allocate_device(type);
     if (!rc) {
         devres_free(dr);
         return NULL;
     }
 
     rc->dev.parent = dev;
     rc->managed_alloc = true;
     *dr = rc;
     devres_add(dev, dr);
 
     return rc;
 }
 EXPORT_SYMBOL_GPL(devm_rc_allocate_device);
 
 static int rc_prepare_rx_device(struct rc_dev *dev)
 {
     int rc;
     struct rc_map *rc_map;
     u64 rc_proto;
 
     if (!dev->map_name)
         return -EINVAL;
 
     rc_map = rc_map_get(dev->map_name);
     if (!rc_map)
         rc_map = rc_map_get(RC_MAP_EMPTY);
     if (!rc_map || !rc_map->scan || rc_map->size == 0)
         return -EINVAL;
 
     rc = ir_setkeytable(dev, rc_map);
     if (rc)
         return rc;
 
     rc_proto = BIT_ULL(rc_map->rc_proto);
 
     if (dev->driver_type == RC_DRIVER_SCANCODE && !dev->change_protocol)
         dev->enabled_protocols = dev->allowed_protocols;
 
     if (dev->driver_type == RC_DRIVER_IR_RAW)
         ir_raw_load_modules(&rc_proto);
 
     if (dev->change_protocol) {
         rc = dev->change_protocol(dev, &rc_proto);
         if (rc < 0)
             goto out_table;
         dev->enabled_protocols = rc_proto;
     }
 
     /* Keyboard events */
     set_bit(EV_KEY, dev->input_dev->evbit);
     set_bit(EV_REP, dev->input_dev->evbit);
     set_bit(EV_MSC, dev->input_dev->evbit);
     set_bit(MSC_SCAN, dev->input_dev->mscbit);
 
     /* Pointer/mouse events */
     set_bit(INPUT_PROP_POINTING_STICK, dev->input_dev->propbit);
     set_bit(EV_REL, dev->input_dev->evbit);
     set_bit(REL_X, dev->input_dev->relbit);
     set_bit(REL_Y, dev->input_dev->relbit);
 
     if (dev->open)
         dev->input_dev->open = ir_open;
     if (dev->close)
         dev->input_dev->close = ir_close;
 
     dev->input_dev->dev.parent = &dev->dev;
     memcpy(&dev->input_dev->id, &dev->input_id, sizeof(dev->input_id));
     dev->input_dev->phys = dev->input_phys;
     dev->input_dev->name = dev->device_name;
 
     return 0;
 
 out_table:
     ir_free_table(&dev->rc_map);
 
     return rc;
 }
 
 static int rc_setup_rx_device(struct rc_dev *dev)
 {
     int rc;
 
     /* rc_open will be called here */
     rc = input_register_device(dev->input_dev);
     if (rc)
         return rc;
 
     /*
      * Default delay of 250ms is too short for some protocols, especially
      * since the timeout is currently set to 250ms. Increase it to 500ms,
      * to avoid wrong repetition of the keycodes. Note that this must be
      * set after the call to input_register_device().
      */
     if (dev->allowed_protocols == RC_PROTO_BIT_CEC)
         dev->input_dev->rep[REP_DELAY] = 0;
     else
         dev->input_dev->rep[REP_DELAY] = 500;
 
     /*
      * As a repeat event on protocols like RC-5 and NEC take as long as
      * 110/114ms, using 33ms as a repeat period is not the right thing
      * to do.
      */
     dev->input_dev->rep[REP_PERIOD] = 125;
 
     return 0;
 }
 
 static void rc_free_rx_device(struct rc_dev *dev)
 {
     if (!dev)
         return;
 
     if (dev->input_dev) {
         input_unregister_device(dev->input_dev);
         dev->input_dev = NULL;
     }
 
     ir_free_table(&dev->rc_map);
 }
 
 int rc_register_device(struct rc_dev *dev)
 {
     const char *path;
     int attr = 0;
     int minor;
     int rc;
 
     if (!dev)
         return -EINVAL;
 
     minor = ida_alloc_max(&rc_ida, RC_DEV_MAX - 1, GFP_KERNEL);
     if (minor < 0)
         return minor;
 
     dev->minor = minor;
     dev_set_name(&dev->dev, "rc%u", dev->minor);
     dev_set_drvdata(&dev->dev, dev);
 
     dev->dev.groups = dev->sysfs_groups;
     if (dev->driver_type == RC_DRIVER_SCANCODE && !dev->change_protocol)
         dev->sysfs_groups[attr++] = &rc_dev_ro_protocol_attr_grp;
     else if (dev->driver_type != RC_DRIVER_IR_RAW_TX)
         dev->sysfs_groups[attr++] = &rc_dev_rw_protocol_attr_grp;
     if (dev->s_filter)
         dev->sysfs_groups[attr++] = &rc_dev_filter_attr_grp;
     if (dev->s_wakeup_filter)
         dev->sysfs_groups[attr++] = &rc_dev_wakeup_filter_attr_grp;
     dev->sysfs_groups[attr++] = NULL;
 
     if (dev->driver_type == RC_DRIVER_IR_RAW) {
         rc = ir_raw_event_prepare(dev);
         if (rc < 0)
             goto out_minor;
     }
 
     if (dev->driver_type != RC_DRIVER_IR_RAW_TX) {
         rc = rc_prepare_rx_device(dev);
         if (rc)
             goto out_raw;
     }
 
     dev->registered = true;
 
     rc = device_add(&dev->dev);
     if (rc)
         goto out_rx_free;
 
     path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
     dev_info(&dev->dev, "%s as %s\n",
          dev->device_name ?: "Unspecified device", path ?: "N/A");
     kfree(path);
 
     /*
      * once the input device is registered in rc_setup_rx_device,
      * userspace can open the input device and rc_open() will be called
      * as a result. This results in driver code being allowed to submit
      * keycodes with rc_keydown, so lirc must be registered first.
      */
     if (dev->allowed_protocols != RC_PROTO_BIT_CEC) {
         rc = lirc_register(dev);
         if (rc < 0)
             goto out_dev;
     }
 
     if (dev->driver_type != RC_DRIVER_IR_RAW_TX) {
         rc = rc_setup_rx_device(dev);
         if (rc)
             goto out_lirc;
     }
 
     if (dev->driver_type == RC_DRIVER_IR_RAW) {
         rc = ir_raw_event_register(dev);
         if (rc < 0)
             goto out_rx;
     }
 
     dev_dbg(&dev->dev, "Registered rc%u (driver: %s)\n", dev->minor,
         dev->driver_name ? dev->driver_name : "unknown");
 
     return 0;
 
 out_rx:
     rc_free_rx_device(dev);
 out_lirc:
     if (dev->allowed_protocols != RC_PROTO_BIT_CEC)
         lirc_unregister(dev);
 out_dev:
     device_del(&dev->dev);
 out_rx_free:
     ir_free_table(&dev->rc_map);
 out_raw:
     ir_raw_event_free(dev);
 out_minor:
     ida_free(&rc_ida, minor);
     return rc;
 }
 EXPORT_SYMBOL_GPL(rc_register_device);
 
 static void devm_rc_release(struct device *dev, void *res)
 {
     rc_unregister_device(*(struct rc_dev **)res);
 }
 
 int devm_rc_register_device(struct device *parent, struct rc_dev *dev)
 {
     struct rc_dev **dr;
     int ret;
 
     dr = devres_alloc(devm_rc_release, sizeof(*dr), GFP_KERNEL);
     if (!dr)
         return -ENOMEM;
 
     ret = rc_register_device(dev);
     if (ret) {
         devres_free(dr);
         return ret;
     }
 
     *dr = dev;
     devres_add(parent, dr);
 
     return 0;
 }
 EXPORT_SYMBOL_GPL(devm_rc_register_device);
 
 void rc_unregister_device(struct rc_dev *dev)
 {
     if (!dev)
         return;
 
     if (dev->driver_type == RC_DRIVER_IR_RAW)
         ir_raw_event_unregister(dev);
 
     del_timer_sync(&dev->timer_keyup);
     del_timer_sync(&dev->timer_repeat);
 
     mutex_lock(&dev->lock);
     if (dev->users && dev->close)
         dev->close(dev);
     dev->registered = false;
     mutex_unlock(&dev->lock);
 
     rc_free_rx_device(dev);
 
     /*
      * lirc device should be freed with dev->registered = false, so
      * that userspace polling will get notified.
      */
     if (dev->allowed_protocols != RC_PROTO_BIT_CEC)
         lirc_unregister(dev);
 
     device_del(&dev->dev);
 
     ida_free(&rc_ida, dev->minor);
 
     if (!dev->managed_alloc)
         rc_free_device(dev);
 }
 
 EXPORT_SYMBOL_GPL(rc_unregister_device);
 
 /*
  * Init/exit code for the module. Basically, creates/removes /sys/class/rc
  */
 
 static int __init rc_core_init(void)
 {
     int rc = class_register(&rc_class);
     if (rc) {
         pr_err("rc_core: unable to register rc class\n");
         return rc;
     }
 
     rc = lirc_dev_init();
     if (rc) {
         pr_err("rc_core: unable to init lirc\n");
         class_unregister(&rc_class);
         return rc;
     }
 
     led_trigger_register_simple("rc-feedback", &led_feedback);
     rc_map_register(&empty_map);
 #ifdef CONFIG_MEDIA_CEC_RC
     rc_map_register(&cec_map);
 #endif
 
     return 0;
 }
 
 static void __exit rc_core_exit(void)
 {
     lirc_dev_exit();
     class_unregister(&rc_class);
     led_trigger_unregister_simple(led_feedback);
 #ifdef CONFIG_MEDIA_CEC_RC
     rc_map_unregister(&cec_map);
 #endif
     rc_map_unregister(&empty_map);
 }
 
 subsys_initcall(rc_core_init);
 module_exit(rc_core_exit);
 
 MODULE_AUTHOR("Mauro Carvalho Chehab");
 MODULE_LICENSE("GPL v2");

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