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path: root/drivers/media/IR/ir-keytable.c
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-rw-r--r--drivers/media/IR/ir-keytable.c710
1 files changed, 0 insertions, 710 deletions
diff --git a/drivers/media/IR/ir-keytable.c b/drivers/media/IR/ir-keytable.c
deleted file mode 100644
index f60107c3b091..000000000000
--- a/drivers/media/IR/ir-keytable.c
+++ /dev/null
@@ -1,710 +0,0 @@
-/* ir-keytable.c - handle IR scancode->keycode tables
- *
- * Copyright (C) 2009 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 <linux/input.h>
-#include <linux/slab.h>
-#include "ir-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
-
-/**
- * ir_create_table() - initializes a scancode table
- * @rc_tab: the ir_scancode_table to initialize
- * @name: name to assign to the table
- * @ir_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 ir_scancode_table and will allocate
- * memory to hold at least the specified number elements.
- */
-static int ir_create_table(struct ir_scancode_table *rc_tab,
- const char *name, u64 ir_type, size_t size)
-{
- rc_tab->name = name;
- rc_tab->ir_type = ir_type;
- rc_tab->alloc = roundup_pow_of_two(size * sizeof(struct ir_scancode));
- rc_tab->size = rc_tab->alloc / sizeof(struct ir_scancode);
- rc_tab->scan = kmalloc(rc_tab->alloc, GFP_KERNEL);
- if (!rc_tab->scan)
- return -ENOMEM;
-
- IR_dprintk(1, "Allocated space for %u keycode entries (%u bytes)\n",
- rc_tab->size, rc_tab->alloc);
- return 0;
-}
-
-/**
- * ir_free_table() - frees memory allocated by a scancode table
- * @rc_tab: 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 ir_scancode_table *rc_tab)
-{
- rc_tab->size = 0;
- kfree(rc_tab->scan);
- rc_tab->scan = NULL;
-}
-
-/**
- * ir_resize_table() - resizes a scancode table if necessary
- * @rc_tab: the ir_scancode_table 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 ir_scancode_table if it has lots of
- * unused entries and grow it if it is full.
- */
-static int ir_resize_table(struct ir_scancode_table *rc_tab, gfp_t gfp_flags)
-{
- unsigned int oldalloc = rc_tab->alloc;
- unsigned int newalloc = oldalloc;
- struct ir_scancode *oldscan = rc_tab->scan;
- struct ir_scancode *newscan;
-
- if (rc_tab->size == rc_tab->len) {
- /* All entries in use -> grow keytable */
- if (rc_tab->alloc >= IR_TAB_MAX_SIZE)
- return -ENOMEM;
-
- newalloc *= 2;
- IR_dprintk(1, "Growing table to %u bytes\n", newalloc);
- }
-
- if ((rc_tab->len * 3 < rc_tab->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_tab->scan, rc_tab->len * sizeof(struct ir_scancode));
- rc_tab->scan = newscan;
- rc_tab->alloc = newalloc;
- rc_tab->size = rc_tab->alloc / sizeof(struct ir_scancode);
- kfree(oldscan);
- return 0;
-}
-
-/**
- * ir_update_mapping() - set a keycode in the scancode->keycode table
- * @dev: the struct input_dev device descriptor
- * @rc_tab: 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->keycopde mapping at given
- * position.
- */
-static unsigned int ir_update_mapping(struct input_dev *dev,
- struct ir_scancode_table *rc_tab,
- unsigned int index,
- unsigned int new_keycode)
-{
- int old_keycode = rc_tab->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_tab->scan[index].scancode);
- rc_tab->len--;
- memmove(&rc_tab->scan[index], &rc_tab->scan[index+ 1],
- (rc_tab->len - index) * sizeof(struct ir_scancode));
- } else {
- IR_dprintk(1, "#%d: %s scan 0x%04x with key 0x%04x\n",
- index,
- old_keycode == KEY_RESERVED ? "New" : "Replacing",
- rc_tab->scan[index].scancode, new_keycode);
- rc_tab->scan[index].keycode = new_keycode;
- __set_bit(new_keycode, dev->keybit);
- }
-
- if (old_keycode != KEY_RESERVED) {
- /* A previous mapping was updated... */
- __clear_bit(old_keycode, dev->keybit);
- /* ... but another scancode might use the same keycode */
- for (i = 0; i < rc_tab->len; i++) {
- if (rc_tab->scan[i].keycode == old_keycode) {
- __set_bit(old_keycode, dev->keybit);
- break;
- }
- }
-
- /* Possibly shrink the keytable, failure is not a problem */
- ir_resize_table(rc_tab, GFP_ATOMIC);
- }
-
- return old_keycode;
-}
-
-/**
- * ir_locate_scancode() - set a keycode in the scancode->keycode table
- * @ir_dev: the struct ir_input_dev device descriptor
- * @rc_tab: 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 ir_scancode_table.
- * If scancode is not yet present the routine will allocate a new slot
- * for it.
- */
-static unsigned int ir_establish_scancode(struct ir_input_dev *ir_dev,
- struct ir_scancode_table *rc_tab,
- 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,
- */
- if (ir_dev->props && ir_dev->props->scanmask)
- scancode &= ir_dev->props->scanmask;
-
- /* First check if we already have a mapping for this ir command */
- for (i = 0; i < rc_tab->len; i++) {
- if (rc_tab->scan[i].scancode == scancode)
- return i;
-
- /* Keytable is sorted from lowest to highest scancode */
- if (rc_tab->scan[i].scancode >= scancode)
- break;
- }
-
- /* No previous mapping found, we might need to grow the table */
- if (rc_tab->size == rc_tab->len) {
- if (!resize || ir_resize_table(rc_tab, GFP_ATOMIC))
- return -1U;
- }
-
- /* i is the proper index to insert our new keycode */
- if (i < rc_tab->len)
- memmove(&rc_tab->scan[i + 1], &rc_tab->scan[i],
- (rc_tab->len - i) * sizeof(struct ir_scancode));
- rc_tab->scan[i].scancode = scancode;
- rc_tab->scan[i].keycode = KEY_RESERVED;
- rc_tab->len++;
-
- return i;
-}
-
-/**
- * ir_setkeycode() - set a keycode in the scancode->keycode table
- * @dev: 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 *dev,
- const struct input_keymap_entry *ke,
- unsigned int *old_keycode)
-{
- struct ir_input_dev *ir_dev = input_get_drvdata(dev);
- struct ir_scancode_table *rc_tab = &ir_dev->rc_tab;
- unsigned int index;
- unsigned int scancode;
- int retval;
- unsigned long flags;
-
- spin_lock_irqsave(&rc_tab->lock, flags);
-
- if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
- index = ke->index;
- if (index >= rc_tab->len) {
- retval = -EINVAL;
- goto out;
- }
- } else {
- retval = input_scancode_to_scalar(ke, &scancode);
- if (retval)
- goto out;
-
- index = ir_establish_scancode(ir_dev, rc_tab, scancode, true);
- if (index >= rc_tab->len) {
- retval = -ENOMEM;
- goto out;
- }
- }
-
- *old_keycode = ir_update_mapping(dev, rc_tab, index, ke->keycode);
-
-out:
- spin_unlock_irqrestore(&rc_tab->lock, flags);
- return retval;
-}
-
-/**
- * ir_setkeytable() - sets several entries in the scancode->keycode table
- * @dev: the struct input_dev device descriptor
- * @to: the struct ir_scancode_table to copy entries to
- * @from: the struct ir_scancode_table 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 ir_input_dev *ir_dev,
- const struct ir_scancode_table *from)
-{
- struct ir_scancode_table *rc_tab = &ir_dev->rc_tab;
- unsigned int i, index;
- int rc;
-
- rc = ir_create_table(&ir_dev->rc_tab,
- from->name, from->ir_type, from->size);
- if (rc)
- return rc;
-
- IR_dprintk(1, "Allocated space for %u keycode entries (%u bytes)\n",
- rc_tab->size, rc_tab->alloc);
-
- for (i = 0; i < from->size; i++) {
- index = ir_establish_scancode(ir_dev, rc_tab,
- from->scan[i].scancode, false);
- if (index >= rc_tab->len) {
- rc = -ENOMEM;
- break;
- }
-
- ir_update_mapping(ir_dev->input_dev, rc_tab, index,
- from->scan[i].keycode);
- }
-
- if (rc)
- ir_free_table(rc_tab);
-
- return rc;
-}
-
-/**
- * ir_lookup_by_scancode() - locate mapping by scancode
- * @rc_tab: the &struct ir_scancode_table 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 ir_scancode_table *rc_tab,
- unsigned int scancode)
-{
- int start = 0;
- int end = rc_tab->len - 1;
- int mid;
-
- while (start <= end) {
- mid = (start + end) / 2;
- if (rc_tab->scan[mid].scancode < scancode)
- start = mid + 1;
- else if (rc_tab->scan[mid].scancode > scancode)
- end = mid - 1;
- else
- return mid;
- }
-
- return -1U;
-}
-
-/**
- * ir_getkeycode() - get a keycode from the scancode->keycode table
- * @dev: 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 *dev,
- struct input_keymap_entry *ke)
-{
- struct ir_input_dev *ir_dev = input_get_drvdata(dev);
- struct ir_scancode_table *rc_tab = &ir_dev->rc_tab;
- struct ir_scancode *entry;
- unsigned long flags;
- unsigned int index;
- unsigned int scancode;
- int retval;
-
- spin_lock_irqsave(&rc_tab->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_tab, scancode);
- }
-
- if (index >= rc_tab->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_tab->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_tab->lock, flags);
- return retval;
-}
-
-/**
- * ir_g_keycode_from_table() - gets the keycode that corresponds to a scancode
- * @input_dev: the struct input_dev descriptor of the device
- * @scancode: the scancode that we're seeking
- *
- * This routine is used by the input routines when a key is pressed at the
- * IR. The scancode is received and needs to be converted into a keycode.
- * If the key is not found, it returns KEY_RESERVED. Otherwise, returns the
- * corresponding keycode from the table.
- */
-u32 ir_g_keycode_from_table(struct input_dev *dev, u32 scancode)
-{
- struct ir_input_dev *ir_dev = input_get_drvdata(dev);
- struct ir_scancode_table *rc_tab = &ir_dev->rc_tab;
- unsigned int keycode;
- unsigned int index;
- unsigned long flags;
-
- spin_lock_irqsave(&rc_tab->lock, flags);
-
- index = ir_lookup_by_scancode(rc_tab, scancode);
- keycode = index < rc_tab->len ?
- rc_tab->scan[index].keycode : KEY_RESERVED;
-
- spin_unlock_irqrestore(&rc_tab->lock, flags);
-
- if (keycode != KEY_RESERVED)
- IR_dprintk(1, "%s: scancode 0x%04x keycode 0x%02x\n",
- dev->name, scancode, keycode);
-
- return keycode;
-}
-EXPORT_SYMBOL_GPL(ir_g_keycode_from_table);
-
-/**
- * ir_keyup() - generates input event to cleanup a key press
- * @ir: the struct ir_input_dev descriptor of the device
- *
- * This routine is used to signal that a key has been released on the
- * remote control. It reports a keyup input event via input_report_key().
- */
-void ir_keyup(struct ir_input_dev *ir)
-{
- if (!ir->keypressed)
- return;
-
- IR_dprintk(1, "keyup key 0x%04x\n", ir->last_keycode);
- input_report_key(ir->input_dev, ir->last_keycode, 0);
- input_sync(ir->input_dev);
- ir->keypressed = false;
-}
-EXPORT_SYMBOL_GPL(ir_keyup);
-
-/**
- * ir_timer_keyup() - generates a keyup event after a timeout
- * @cookie: a pointer to struct ir_input_dev passed to setup_timer()
- *
- * 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 ir_input_dev *ir = (struct ir_input_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(&ir->keylock, flags);
- if (time_is_before_eq_jiffies(ir->keyup_jiffies))
- ir_keyup(ir);
- spin_unlock_irqrestore(&ir->keylock, flags);
-}
-
-/**
- * ir_repeat() - notifies the IR core that a key is still pressed
- * @dev: the struct input_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 ir_repeat(struct input_dev *dev)
-{
- unsigned long flags;
- struct ir_input_dev *ir = input_get_drvdata(dev);
-
- spin_lock_irqsave(&ir->keylock, flags);
-
- input_event(dev, EV_MSC, MSC_SCAN, ir->last_scancode);
-
- if (!ir->keypressed)
- goto out;
-
- ir->keyup_jiffies = jiffies + msecs_to_jiffies(IR_KEYPRESS_TIMEOUT);
- mod_timer(&ir->timer_keyup, ir->keyup_jiffies);
-
-out:
- spin_unlock_irqrestore(&ir->keylock, flags);
-}
-EXPORT_SYMBOL_GPL(ir_repeat);
-
-/**
- * ir_keydown() - generates input event for a key press
- * @dev: the struct input_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 by the input routines when a key is pressed at the
- * IR. It gets the keycode for a scancode and reports an input event via
- * input_report_key().
- */
-void ir_keydown(struct input_dev *dev, int scancode, u8 toggle)
-{
- unsigned long flags;
- struct ir_input_dev *ir = input_get_drvdata(dev);
-
- u32 keycode = ir_g_keycode_from_table(dev, scancode);
-
- spin_lock_irqsave(&ir->keylock, flags);
-
- input_event(dev, EV_MSC, MSC_SCAN, scancode);
-
- /* Repeat event? */
- if (ir->keypressed &&
- ir->last_scancode == scancode &&
- ir->last_toggle == toggle)
- goto set_timer;
-
- /* Release old keypress */
- ir_keyup(ir);
-
- ir->last_scancode = scancode;
- ir->last_toggle = toggle;
- ir->last_keycode = keycode;
-
-
- if (keycode == KEY_RESERVED)
- goto out;
-
-
- /* Register a keypress */
- ir->keypressed = true;
- IR_dprintk(1, "%s: key down event, key 0x%04x, scancode 0x%04x\n",
- dev->name, keycode, scancode);
- input_report_key(dev, ir->last_keycode, 1);
- input_sync(dev);
-
-set_timer:
- ir->keyup_jiffies = jiffies + msecs_to_jiffies(IR_KEYPRESS_TIMEOUT);
- mod_timer(&ir->timer_keyup, ir->keyup_jiffies);
-out:
- spin_unlock_irqrestore(&ir->keylock, flags);
-}
-EXPORT_SYMBOL_GPL(ir_keydown);
-
-static int ir_open(struct input_dev *input_dev)
-{
- struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
-
- return ir_dev->props->open(ir_dev->props->priv);
-}
-
-static void ir_close(struct input_dev *input_dev)
-{
- struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
-
- ir_dev->props->close(ir_dev->props->priv);
-}
-
-/**
- * __ir_input_register() - sets the IR keycode table and add the handlers
- * for keymap table get/set
- * @input_dev: the struct input_dev descriptor of the device
- * @rc_tab: the struct ir_scancode_table table of scancode/keymap
- *
- * This routine is used to initialize the input infrastructure
- * to work with an IR.
- * It will register the input/evdev interface for the device and
- * register the syfs code for IR class
- */
-int __ir_input_register(struct input_dev *input_dev,
- const struct ir_scancode_table *rc_tab,
- struct ir_dev_props *props,
- const char *driver_name)
-{
- struct ir_input_dev *ir_dev;
- int rc;
-
- if (rc_tab->scan == NULL || !rc_tab->size)
- return -EINVAL;
-
- ir_dev = kzalloc(sizeof(*ir_dev), GFP_KERNEL);
- if (!ir_dev)
- return -ENOMEM;
-
- ir_dev->driver_name = kasprintf(GFP_KERNEL, "%s", driver_name);
- if (!ir_dev->driver_name) {
- rc = -ENOMEM;
- goto out_dev;
- }
-
- input_dev->getkeycode_new = ir_getkeycode;
- input_dev->setkeycode_new = ir_setkeycode;
- input_set_drvdata(input_dev, ir_dev);
- ir_dev->input_dev = input_dev;
-
- spin_lock_init(&ir_dev->rc_tab.lock);
- spin_lock_init(&ir_dev->keylock);
- setup_timer(&ir_dev->timer_keyup, ir_timer_keyup, (unsigned long)ir_dev);
-
- if (props) {
- ir_dev->props = props;
- if (props->open)
- input_dev->open = ir_open;
- if (props->close)
- input_dev->close = ir_close;
- }
-
- set_bit(EV_KEY, input_dev->evbit);
- set_bit(EV_REP, input_dev->evbit);
- set_bit(EV_MSC, input_dev->evbit);
- set_bit(MSC_SCAN, input_dev->mscbit);
-
- rc = ir_setkeytable(ir_dev, rc_tab);
- if (rc)
- goto out_name;
-
- rc = ir_register_class(input_dev);
- if (rc < 0)
- goto out_table;
-
- if (ir_dev->props)
- if (ir_dev->props->driver_type == RC_DRIVER_IR_RAW) {
- rc = ir_raw_event_register(input_dev);
- if (rc < 0)
- goto out_event;
- }
-
- rc = ir_register_input(input_dev);
- if (rc < 0)
- goto out_event;
-
- IR_dprintk(1, "Registered input device on %s for %s remote%s.\n",
- driver_name, rc_tab->name,
- (ir_dev->props && ir_dev->props->driver_type == RC_DRIVER_IR_RAW) ?
- " in raw mode" : "");
-
- /*
- * 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.
- */
- input_dev->rep[REP_DELAY] = 500;
-
- return 0;
-
-out_event:
- ir_unregister_class(input_dev);
-out_table:
- ir_free_table(&ir_dev->rc_tab);
-out_name:
- kfree(ir_dev->driver_name);
-out_dev:
- kfree(ir_dev);
- return rc;
-}
-EXPORT_SYMBOL_GPL(__ir_input_register);
-
-/**
- * ir_input_unregister() - unregisters IR and frees resources
- * @input_dev: the struct input_dev descriptor of the device
-
- * This routine is used to free memory and de-register interfaces.
- */
-void ir_input_unregister(struct input_dev *input_dev)
-{
- struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
-
- if (!ir_dev)
- return;
-
- IR_dprintk(1, "Freed keycode table\n");
-
- del_timer_sync(&ir_dev->timer_keyup);
- if (ir_dev->props)
- if (ir_dev->props->driver_type == RC_DRIVER_IR_RAW)
- ir_raw_event_unregister(input_dev);
-
- ir_free_table(&ir_dev->rc_tab);
-
- ir_unregister_class(input_dev);
-
- kfree(ir_dev->driver_name);
- kfree(ir_dev);
-}
-EXPORT_SYMBOL_GPL(ir_input_unregister);
-
-int ir_core_debug; /* ir_debug level (0,1,2) */
-EXPORT_SYMBOL_GPL(ir_core_debug);
-module_param_named(debug, ir_core_debug, int, 0644);
-
-MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
-MODULE_LICENSE("GPL");