1 files changed, 1135 insertions, 0 deletions

diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
new file mode 100644
index 000000000000..72be8a02118c
--- /dev/null
+++ b/drivers/media/rc/rc-main.c
@@ -0,0 +1,1135 @@
+/* rc-main.c - Remote Controller core module
+ *
+ * Copyright (C) 2009-2010 by Mauro Carvalho Chehab <mchehab@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation version 2 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ */
+
+#include <media/rc-core.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <linux/input.h>
+#include <linux/slab.h>
+#include <linux/device.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
+
+/* FIXME: IR_KEYPRESS_TIMEOUT should be protocol specific */
+#define IR_KEYPRESS_TIMEOUT 250
+
+/* Used to keep track of known keymaps */
+static LIST_HEAD(rc_map_list);
+static DEFINE_SPINLOCK(rc_map_lock);
+
+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 MODULE
+        if (!map) {
+                int rc = request_module(name);
+                if (rc < 0) {
+                        printk(KERN_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) {
+                printk(KERN_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_type = RC_TYPE_UNKNOWN,     /* Legacy IR type */
+                .name    = RC_MAP_EMPTY,
+        }
+};
+
+/**
+ * ir_create_table() - initializes a scancode table
+ * @rc_map:     the rc_map to initialize
+ * @name:       name to assign to the table
+ * @rc_type:    ir type to assign to the new table
+ * @size:       initial size of the table
+ * @return:     zero on success or a negative error code
+ *
+ * This routine will initialize the rc_map and will allocate
+ * memory to hold at least the specified number of elements.
+ */
+static int ir_create_table(struct rc_map *rc_map,
+                           const char *name, u64 rc_type, size_t size)
+{
+        rc_map->name = name;
+        rc_map->rc_type = rc_type;
+        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)
+                return -ENOMEM;
+
+        IR_dprintk(1, "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->scan);
+        rc_map->scan = NULL;
+}
+
+/**
+ * ir_resize_table() - resizes a scancode table if necessary
+ * @rc_map:     the rc_map to resize
+ * @gfp_flags:  gfp flags to use when allocating memory
+ * @return:     zero on success or a negative error code
+ *
+ * This routine will shrink the rc_map if it has lots of
+ * unused entries and grow it if it is full.
+ */
+static int ir_resize_table(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;
+                IR_dprintk(1, "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;
+                IR_dprintk(1, "Shrinking table to %u bytes\n", newalloc);
+        }
+
+        if (newalloc == oldalloc)
+                return 0;
+
+        newscan = kmalloc(newalloc, gfp_flags);
+        if (!newscan) {
+                IR_dprintk(1, "Failed to kmalloc %u bytes\n", newalloc);
+                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
+ * @keycode:    the desired keycode
+ * @return:     previous keycode assigned to the mapping
+ *
+ * This routine is used to update scancode->keycode mapping at given
+ * position.
+ */
+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) {
+                IR_dprintk(1, "#%d: Deleting scan 0x%04x\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 {
+                IR_dprintk(1, "#%d: %s scan 0x%04x 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(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
+ *              accomodate not yet present scancodes
+ * @return:     index of the mapping containing scancode in question
+ *              or -1U in case of failure.
+ *
+ * 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.
+ */
+static unsigned int ir_establish_scancode(struct rc_dev *dev,
+                                          struct rc_map *rc_map,
+                                          unsigned int 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->scanmask)
+                scancode &= dev->scanmask;
+
+        /* 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(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
+ * @scancode:   the desired scancode
+ * @keycode:    result
+ * @return:     -EINVAL if the keycode could not be inserted, otherwise zero.
+ *
+ * This routine is used to handle evdev EVIOCSKEY ioctl.
+ */
+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;
+        unsigned int 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 = input_scancode_to_scalar(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
+ * @to:         the struct rc_map to copy entries to
+ * @from:       the struct rc_map to copy entries from
+ * @return:     -ENOMEM if all keycodes could not be inserted, otherwise zero.
+ *
+ * This routine is used to handle table initialization.
+ */
+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(rc_map, from->name,
+                             from->rc_type, from->size);
+        if (rc)
+                return rc;
+
+        IR_dprintk(1, "Allocated space for %u keycode entries (%u bytes)\n",
+                   rc_map->size, rc_map->alloc);
+
+        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;
+}
+
+/**
+ * ir_lookup_by_scancode() - locate mapping by scancode
+ * @rc_map:     the struct rc_map to search
+ * @scancode:   scancode to look for in the table
+ * @return:     index in the table, -1U if not found
+ *
+ * This routine performs binary search in RC keykeymap table for
+ * given scancode.
+ */
+static unsigned int ir_lookup_by_scancode(const struct rc_map *rc_map,
+                                          unsigned int scancode)
+{
+        int start = 0;
+        int end = rc_map->len - 1;
+        int mid;
+
+        while (start <= end) {
+                mid = (start + end) / 2;
+                if (rc_map->scan[mid].scancode < scancode)
+                        start = mid + 1;
+                else if (rc_map->scan[mid].scancode > scancode)
+                        end = mid - 1;
+                else
+                        return mid;
+        }
+
+        return -1U;
+}
+
+/**
+ * ir_getkeycode() - get a keycode from the scancode->keycode table
+ * @idev:       the struct input_dev device descriptor
+ * @scancode:   the desired scancode
+ * @keycode:    used to return the keycode, if found, or KEY_RESERVED
+ * @return:     always returns zero.
+ *
+ * This routine is used to handle evdev EVIOCGKEY ioctl.
+ */
+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;
+        unsigned int scancode;
+        int retval;
+
+        spin_lock_irqsave(&rc_map->lock, flags);
+
+        if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
+                index = ke->index;
+        } else {
+                retval = input_scancode_to_scalar(ke, &scancode);
+                if (retval)
+                        goto out;
+
+                index = ir_lookup_by_scancode(rc_map, scancode);
+        }
+
+        if (index >= rc_map->len) {
+                if (!(ke->flags & INPUT_KEYMAP_BY_INDEX))
+                        IR_dprintk(1, "unknown key for scancode 0x%04x\n",
+                                   scancode);
+                retval = -EINVAL;
+                goto out;
+        }
+
+        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));
+
+        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
+ * @return:     the corresponding keycode, or KEY_RESERVED
+ *
+ * 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.
+ */
+u32 rc_g_keycode_from_table(struct rc_dev *dev, u32 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)
+                IR_dprintk(1, "%s: scancode 0x%04x keycode 0x%02x\n",
+                           dev->input_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
+ *
+ * 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)
+{
+        if (!dev->keypressed)
+                return;
+
+        IR_dprintk(1, "keyup key 0x%04x\n", dev->last_keycode);
+        input_report_key(dev->input_dev, dev->last_keycode, 0);
+        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);
+        spin_unlock_irqrestore(&dev->keylock, flags);
+}
+EXPORT_SYMBOL_GPL(rc_keyup);
+
+/**
+ * ir_timer_keyup() - generates a keyup event after a timeout
+ * @cookie:     a pointer to the struct rc_dev for the device
+ *
+ * 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(unsigned long cookie)
+{
+        struct rc_dev *dev = (struct rc_dev *)cookie;
+        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);
+        spin_unlock_irqrestore(&dev->keylock, flags);
+}
+
+/**
+ * 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;
+
+        spin_lock_irqsave(&dev->keylock, flags);
+
+        input_event(dev->input_dev, EV_MSC, MSC_SCAN, dev->last_scancode);
+
+        if (!dev->keypressed)
+                goto out;
+
+        dev->keyup_jiffies = jiffies + msecs_to_jiffies(IR_KEYPRESS_TIMEOUT);
+        mod_timer(&dev->timer_keyup, dev->keyup_jiffies);
+
+out:
+        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
+ * @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, int scancode,
+                          u32 keycode, u8 toggle)
+{
+        input_event(dev->input_dev, EV_MSC, MSC_SCAN, scancode);
+
+        /* Repeat event? */
+        if (dev->keypressed &&
+            dev->last_scancode == scancode &&
+            dev->last_toggle == toggle)
+                return;
+
+        /* Release old keypress */
+        ir_do_keyup(dev);
+
+        dev->last_scancode = scancode;
+        dev->last_toggle = toggle;
+        dev->last_keycode = keycode;
+
+        if (keycode == KEY_RESERVED)
+                return;
+
+        /* Register a keypress */
+        dev->keypressed = true;
+        IR_dprintk(1, "%s: key down event, key 0x%04x, scancode 0x%04x\n",
+                   dev->input_name, keycode, scancode);
+        input_report_key(dev->input_dev, dev->last_keycode, 1);
+        input_sync(dev->input_dev);
+}
+
+/**
+ * rc_keydown() - generates input event for a key press
+ * @dev:        the struct rc_dev descriptor of the device
+ * @scancode:   the scancode that we're seeking
+ * @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, int 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, scancode, keycode, toggle);
+
+        if (dev->keypressed) {
+                dev->keyup_jiffies = jiffies + msecs_to_jiffies(IR_KEYPRESS_TIMEOUT);
+                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
+ * @scancode:   the scancode that we're seeking
+ * @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, int 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, scancode, keycode, toggle);
+        spin_unlock_irqrestore(&dev->keylock, flags);
+}
+EXPORT_SYMBOL_GPL(rc_keydown_notimeout);
+
+static int ir_open(struct input_dev *idev)
+{
+        struct rc_dev *rdev = input_get_drvdata(idev);
+
+        return rdev->open(rdev);
+}
+
+static void ir_close(struct input_dev *idev)
+{
+        struct rc_dev *rdev = input_get_drvdata(idev);
+
+        rdev->close(rdev);
+}
+
+/* class for /sys/class/rc */
+static char *ir_devnode(struct device *dev, mode_t *mode)
+{
+        return kasprintf(GFP_KERNEL, "rc/%s", dev_name(dev));
+}
+
+static struct class ir_input_class = {
+        .name           = "rc",
+        .devnode        = ir_devnode,
+};
+
+static struct {
+        u64     type;
+        char    *name;
+} proto_names[] = {
+        { RC_TYPE_UNKNOWN,      "unknown"       },
+        { RC_TYPE_RC5,          "rc-5"          },
+        { RC_TYPE_NEC,          "nec"           },
+        { RC_TYPE_RC6,          "rc-6"          },
+        { RC_TYPE_JVC,          "jvc"           },
+        { RC_TYPE_SONY,         "sony"          },
+        { RC_TYPE_RC5_SZ,       "rc-5-sz"       },
+        { RC_TYPE_LIRC,         "lirc"          },
+};
+
+#define PROTO_NONE      "none"
+
+/**
+ * show_protocols() - shows the current IR protocol(s)
+ * @device:     the device descriptor
+ * @mattr:      the device attribute struct (unused)
+ * @buf:        a pointer to the output buffer
+ *
+ * This routine is a callback routine for input read the IR protocol type(s).
+ * it is trigged by reading /sys/class/rc/rc?/protocols.
+ * It returns the protocol names of supported protocols.
+ * Enabled protocols are printed in brackets.
+ */
+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;
+
+        /* Device is being removed */
+        if (!dev)
+                return -EINVAL;
+
+        if (dev->driver_type == RC_DRIVER_SCANCODE) {
+                enabled = dev->rc_map.rc_type;
+                allowed = dev->allowed_protos;
+        } else {
+                enabled = dev->raw->enabled_protocols;
+                allowed = ir_raw_get_allowed_protocols();
+        }
+
+        IR_dprintk(1, "allowed - 0x%llx, enabled - 0x%llx\n",
+                   (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 (tmp != buf)
+                tmp--;
+        *tmp = '\n';
+        return tmp + 1 - buf;
+}
+
+/**
+ * store_protocols() - changes the current IR protocol(s)
+ * @device:     the device descriptor
+ * @mattr:      the device attribute struct (unused)
+ * @buf:        a pointer to the input buffer
+ * @len:        length of the input buffer
+ *
+ * This routine is for changing the IR protocol type.
+ * It is trigged by writing to /sys/class/rc/rc?/protocols.
+ * Writing "+proto" will add a protocol to the list of enabled protocols.
+ * Writing "-proto" will remove a protocol from the list of enabled protocols.
+ * Writing "proto" will enable only "proto".
+ * Writing "none" will disable all protocols.
+ * Returns -EINVAL if an invalid protocol combination or unknown protocol name
+ * is used, otherwise @len.
+ */
+static ssize_t store_protocols(struct device *device,
+                               struct device_attribute *mattr,
+                               const char *data,
+                               size_t len)
+{
+        struct rc_dev *dev = to_rc_dev(device);
+        bool enable, disable;
+        const char *tmp;
+        u64 type;
+        u64 mask;
+        int rc, i, count = 0;
+        unsigned long flags;
+
+        /* Device is being removed */
+        if (!dev)
+                return -EINVAL;
+
+        if (dev->driver_type == RC_DRIVER_SCANCODE)
+                type = dev->rc_map.rc_type;
+        else if (dev->raw)
+                type = dev->raw->enabled_protocols;
+        else {
+                IR_dprintk(1, "Protocol switching not supported\n");
+                return -EINVAL;
+        }
+
+        while ((tmp = strsep((char **) &data, " \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;
+                }
+
+                if (!enable && !disable && !strncasecmp(tmp, PROTO_NONE, sizeof(PROTO_NONE))) {
+                        tmp += sizeof(PROTO_NONE);
+                        mask = 0;
+                        count++;
+                } else {
+                        for (i = 0; i < ARRAY_SIZE(proto_names); i++) {
+                                if (!strncasecmp(tmp, proto_names[i].name, strlen(proto_names[i].name))) {
+                                        tmp += strlen(proto_names[i].name);
+                                        mask = proto_names[i].type;
+                                        break;
+                                }
+                        }
+                        if (i == ARRAY_SIZE(proto_names)) {
+                                IR_dprintk(1, "Unknown protocol: '%s'\n", tmp);
+                                return -EINVAL;
+                        }
+                        count++;
+                }
+
+                if (enable)
+                        type |= mask;
+                else if (disable)
+                        type &= ~mask;
+                else
+                        type = mask;
+        }
+
+        if (!count) {
+                IR_dprintk(1, "Protocol not specified\n");
+                return -EINVAL;
+        }
+
+        if (dev->change_protocol) {
+                rc = dev->change_protocol(dev, type);
+                if (rc < 0) {
+                        IR_dprintk(1, "Error setting protocols to 0x%llx\n",
+                                   (long long)type);
+                        return -EINVAL;
+                }
+        }
+
+        if (dev->driver_type == RC_DRIVER_SCANCODE) {
+                spin_lock_irqsave(&dev->rc_map.lock, flags);
+                dev->rc_map.rc_type = type;
+                spin_unlock_irqrestore(&dev->rc_map.lock, flags);
+        } else {
+                dev->raw->enabled_protocols = type;
+        }
+
+        IR_dprintk(1, "Current protocol(s): 0x%llx\n",
+                   (long long)type);
+
+        return len;
+}
+
+static void rc_dev_release(struct device *device)
+{
+        struct rc_dev *dev = to_rc_dev(device);
+
+        kfree(dev);
+        module_put(THIS_MODULE);
+}
+
+#define ADD_HOTPLUG_VAR(fmt, val...)                                    \
+        do {                                                            \
+                int err = add_uevent_var(env, fmt, val);                \
+                if (err)                                                \
+                        return err;                                     \
+        } while (0)
+
+static int rc_dev_uevent(struct device *device, struct kobj_uevent_env *env)
+{
+        struct rc_dev *dev = to_rc_dev(device);
+
+        if (dev->rc_map.name)
+                ADD_HOTPLUG_VAR("NAME=%s", dev->rc_map.name);
+        if (dev->driver_name)
+                ADD_HOTPLUG_VAR("DRV_NAME=%s", dev->driver_name);
+
+        return 0;
+}
+
+/*
+ * Static device attribute struct with the sysfs attributes for IR's
+ */
+static DEVICE_ATTR(protocols, S_IRUGO | S_IWUSR,
+                   show_protocols, store_protocols);
+
+static struct attribute *rc_dev_attrs[] = {
+        &dev_attr_protocols.attr,
+        NULL,
+};
+
+static struct attribute_group rc_dev_attr_grp = {
+        .attrs  = rc_dev_attrs,
+};
+
+static const struct attribute_group *rc_dev_attr_groups[] = {
+        &rc_dev_attr_grp,
+        NULL
+};
+
+static struct device_type rc_dev_type = {
+        .groups         = rc_dev_attr_groups,
+        .release        = rc_dev_release,
+        .uevent         = rc_dev_uevent,
+};
+
+struct rc_dev *rc_allocate_device(void)
+{
+        struct rc_dev *dev;
+
+        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+        if (!dev)
+                return NULL;
+
+        dev->input_dev = input_allocate_device();
+        if (!dev->input_dev) {
+                kfree(dev);
+                return NULL;
+        }
+
+        dev->input_dev->getkeycode_new = ir_getkeycode;
+        dev->input_dev->setkeycode_new = ir_setkeycode;
+        input_set_drvdata(dev->input_dev, dev);
+
+        spin_lock_init(&dev->rc_map.lock);
+        spin_lock_init(&dev->keylock);
+        setup_timer(&dev->timer_keyup, ir_timer_keyup, (unsigned long)dev);
+
+        dev->dev.type = &rc_dev_type;
+        dev->dev.class = &ir_input_class;
+        device_initialize(&dev->dev);
+
+        __module_get(THIS_MODULE);
+        return dev;
+}
+EXPORT_SYMBOL_GPL(rc_allocate_device);
+
+void rc_free_device(struct rc_dev *dev)
+{
+        if (dev) {
+                input_free_device(dev->input_dev);
+                put_device(&dev->dev);
+        }
+}
+EXPORT_SYMBOL_GPL(rc_free_device);
+
+int rc_register_device(struct rc_dev *dev)
+{
+        static atomic_t devno = ATOMIC_INIT(0);
+        struct rc_map *rc_map;
+        const char *path;
+        int rc;
+
+        if (!dev || !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;
+
+        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);
+        if (dev->open)
+                dev->input_dev->open = ir_open;
+        if (dev->close)
+                dev->input_dev->close = ir_close;
+
+        dev->devno = (unsigned long)(atomic_inc_return(&devno) - 1);
+        dev_set_name(&dev->dev, "rc%ld", dev->devno);
+        dev_set_drvdata(&dev->dev, dev);
+        rc = device_add(&dev->dev);
+        if (rc)
+                return rc;
+
+        rc = ir_setkeytable(dev, rc_map);
+        if (rc)
+                goto out_dev;
+
+        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->input_name;
+        rc = input_register_device(dev->input_dev);
+        if (rc)
+                goto out_table;
+
+        /*
+         * Default delay of 250ms is too short for some protocols, expecially
+         * 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().
+         */
+        dev->input_dev->rep[REP_DELAY] = 500;
+
+        path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
+        printk(KERN_INFO "%s: %s as %s\n",
+                dev_name(&dev->dev),
+                dev->input_name ? dev->input_name : "Unspecified device",
+                path ? path : "N/A");
+        kfree(path);
+
+        if (dev->driver_type == RC_DRIVER_IR_RAW) {
+                rc = ir_raw_event_register(dev);
+                if (rc < 0)
+                        goto out_input;
+        }
+
+        if (dev->change_protocol) {
+                rc = dev->change_protocol(dev, rc_map->rc_type);
+                if (rc < 0)
+                        goto out_raw;
+        }
+
+        IR_dprintk(1, "Registered rc%ld (driver: %s, remote: %s, mode %s)\n",
+                   dev->devno,
+                   dev->driver_name ? dev->driver_name : "unknown",
+                   rc_map->name ? rc_map->name : "unknown",
+                   dev->driver_type == RC_DRIVER_IR_RAW ? "raw" : "cooked");
+
+        return 0;
+
+out_raw:
+        if (dev->driver_type == RC_DRIVER_IR_RAW)
+                ir_raw_event_unregister(dev);
+out_input:
+        input_unregister_device(dev->input_dev);
+        dev->input_dev = NULL;
+out_table:
+        ir_free_table(&dev->rc_map);
+out_dev:
+        device_del(&dev->dev);
+        return rc;
+}
+EXPORT_SYMBOL_GPL(rc_register_device);
+
+void rc_unregister_device(struct rc_dev *dev)
+{
+        if (!dev)
+                return;
+
+        del_timer_sync(&dev->timer_keyup);
+
+        if (dev->driver_type == RC_DRIVER_IR_RAW)
+                ir_raw_event_unregister(dev);
+
+        input_unregister_device(dev->input_dev);
+        dev->input_dev = NULL;
+
+        ir_free_table(&dev->rc_map);
+        IR_dprintk(1, "Freed keycode table\n");
+
+        device_unregister(&dev->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(&ir_input_class);
+        if (rc) {
+                printk(KERN_ERR "rc_core: unable to register rc class\n");
+                return rc;
+        }
+
+        /* Initialize/load the decoders/keymap code that will be used */
+        ir_raw_init();
+        rc_map_register(&empty_map);
+
+        return 0;
+}
+
+static void __exit rc_core_exit(void)
+{
+        class_unregister(&ir_input_class);
+        rc_map_unregister(&empty_map);
+}
+
+module_init(rc_core_init);
+module_exit(rc_core_exit);
+
+int rc_core_debug;    /* ir_debug level (0,1,2) */
+EXPORT_SYMBOL_GPL(rc_core_debug);
+module_param_named(debug, rc_core_debug, int, 0644);
+
+MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
+MODULE_LICENSE("GPL");