/* 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 <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
/* 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
* accommodate 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) {
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
* @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
* @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;
IR_dprintk(1, "keyup key 0x%04x\n", dev->last_keycode);
input_report_key(dev->input_dev, dev->last_keycode, 0);
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
* @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, true);
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);
input_sync(dev->input_dev);
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)
{
bool new_event = !dev->keypressed ||
dev->last_scancode != scancode ||
dev->last_toggle != toggle;
if (new_event && dev->keypressed)
ir_do_keyup(dev, false);
input_event(dev->input_dev, EV_MSC, MSC_SCAN, scancode);
if (new_event && keycode != KEY_RESERVED) {
/* Register a keypress */
dev->keypressed = true;
dev->last_scancode = scancode;
dev->last_toggle = toggle;
dev->last_keycode = keycode;
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, 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);
if (rdev)
rdev->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 struct {
u64 type;
char *name;
} proto_names[] = {
{ RC_BIT_NONE, "none" },
{ RC_BIT_OTHER, "other" },
{ RC_BIT_UNKNOWN, "unknown" },
{ RC_BIT_RC5 |
RC_BIT_RC5X, "rc-5" },
{ RC_BIT_NEC, "nec" },
{ RC_BIT_RC6_0 |
RC_BIT_RC6_6A_20 |
RC_BIT_RC6_6A_24 |
RC_BIT_RC6_6A_32 |
RC_BIT_RC6_MCE, "rc-6" },
{ RC_BIT_JVC, "jvc" },
{ RC_BIT_SONY12 |
RC_BIT_SONY15 |
RC_BIT_SONY20, "sony" },
{ RC_BIT_RC5_SZ, "rc-5-sz" },
{ RC_BIT_SANYO, "sanyo" },
{ RC_BIT_MCE_KBD, "mce_kbd" },
{ RC_BIT_LIRC, "lirc" },
};
/**
* 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.
*
* dev->lock is taken to guard against races between device
* registration, 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;
/* Device is being removed */
if (!dev)
return -EINVAL;
mutex_lock(&dev->lock);
enabled = dev->enabled_protocols;
if (dev->driver_type == RC_DRIVER_SCANCODE)
allowed = dev->allowed_protos;
else if (dev->raw)
allowed = ir_raw_get_allowed_protocols();
else {
mutex_unlock(&dev->lock);
return -ENODEV;
}
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 (allowed & proto_names[i].type)
allowed &= ~proto_names[i].type;
}
if (tmp != buf)
tmp--;
*tmp = '\n';
mutex_unlock(&dev->lock);
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.
*
* dev->lock is taken to guard against races between device
* registration, store_protocols and show_protocols.
*/
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;
ssize_t ret;
/* Device is being removed */
if (!dev)
return -EINVAL;
mutex_lock(&dev->lock);
if (dev->driver_type != RC_DRIVER_SCANCODE && !dev->raw) {
IR_dprintk(1, "Protocol switching not supported\n");
ret = -EINVAL;
goto out;
}
type = dev->enabled_protocols;
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;
}
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)) {
IR_dprintk(1, "Unknown protocol: '%s'\n", tmp);
ret = -EINVAL;
goto out;
}
count++;
if (enable)
type |= mask;
else if (disable)
type &= ~mask;
else
type = mask;
}
if (!count) {
IR_dprintk(1, "Protocol not specified\n");
ret = -EINVAL;
goto out;
}
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);
ret = -EINVAL;
goto out;
}
}
dev->enabled_protocols = type;
IR_dprintk(1, "Current protocol(s): 0x%llx\n",
(long long)type);
ret = len;
out:
mutex_unlock(&dev->lock);
return ret;
}
static void rc_dev_release(struct device *device)
{
}
#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 || !dev->input_dev)
return -ENODEV;
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 = ir_getkeycode;
dev->input_dev->setkeycode = ir_setkeycode;
input_set_drvdata(dev->input_dev, dev);
spin_lock_init(&dev->rc_map.lock);
spin_lock_init(&dev->keylock);
mutex_init(&dev->lock);
setup_timer(&dev->timer_keyup, ir_timer_keyup, (unsigned long)dev);
dev->dev.type = &rc_dev_type;
dev->dev.class = &rc_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)
return;
if (dev->input_dev)
input_free_device(dev->input_dev);
put_device(&dev->dev);
kfree(dev);
module_put(THIS_MODULE);
}
EXPORT_SYMBOL_GPL(rc_free_device);
int rc_register_device(struct rc_dev *dev)
{
static bool raw_init = false; /* raw decoders loaded? */
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;
/*
* Take the lock here, as the device sysfs node will appear
* when device_add() is called, which may trigger an ir-keytable udev
* rule, which will in turn call show_protocols and access
* dev->enabled_protocols before it has been initialized.
*/
mutex_lock(&dev->lock);
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)
goto out_unlock;
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, 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().
*/
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;
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) {
/* Load raw decoders, if they aren't already */
if (!raw_init) {
IR_dprintk(1, "Loading raw decoders\n");
ir_raw_init();
raw_init = true;
}
rc = ir_raw_event_register(dev);
if (rc < 0)
goto out_input;
}
if (dev->change_protocol) {
u64 rc_type = (1 << rc_map->rc_type);
rc = dev->change_protocol(dev, &rc_type);
if (rc < 0)
goto out_raw;
dev->enabled_protocols = rc_type;
}
mutex_unlock(&dev->lock);
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);
out_unlock:
mutex_unlock(&dev->lock);
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);
/* Freeing the table should also call the stop callback */
ir_free_table(&dev->rc_map);
IR_dprintk(1, "Freed keycode table\n");
input_unregister_device(dev->input_dev);
dev->input_dev = NULL;
device_del(&dev->dev);
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) {
printk(KERN_ERR "rc_core: unable to register rc class\n");
return rc;
}
rc_map_register(&empty_map);
return 0;
}
static void __exit rc_core_exit(void)
{
class_unregister(&rc_class);
rc_map_unregister(&empty_map);
}
subsys_initcall(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");