diff options
Diffstat (limited to 'kernel/drivers/media/rc/rc-main.c')
| -rw-r--r-- | kernel/drivers/media/rc/rc-main.c | 1520 |
1 files changed, 1520 insertions, 0 deletions
diff --git a/kernel/drivers/media/rc/rc-main.c b/kernel/drivers/media/rc/rc-main.c new file mode 100644 index 000000000..f8c5e47a3 --- /dev/null +++ b/kernel/drivers/media/rc/rc-main.c @@ -0,0 +1,1520 @@ +/* rc-main.c - Remote Controller core module + * + * Copyright (C) 2009-2010 by Mauro Carvalho Chehab + * + * 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/leds.h> +#include <linux/slab.h> +#include <linux/device.h> +#include <linux/module.h> +#include "rc-core-priv.h" + +/* Bitmap to store allocated device numbers from 0 to IRRCV_NUM_DEVICES - 1 */ +#define IRRCV_NUM_DEVICES 256 +static DECLARE_BITMAP(ir_core_dev_number, IRRCV_NUM_DEVICES); + +/* 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 led_trigger *led_feedback; + +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("%s", 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->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(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); + 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 + * @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 + * @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_type protocol, + u32 scancode, u32 keycode, u8 toggle) +{ + bool new_event = (!dev->keypressed || + dev->last_protocol != protocol || + 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_protocol = protocol; + dev->last_scancode = scancode; + dev->last_toggle = toggle; + dev->last_keycode = keycode; + + IR_dprintk(1, "%s: key down event, " + "key 0x%04x, protocol 0x%04x, scancode 0x%08x\n", + dev->input_name, keycode, protocol, scancode); + input_report_key(dev->input_dev, keycode, 1); + + led_trigger_event(led_feedback, LED_FULL); + } + + 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_type protocol, u32 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 + 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 + * @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_type protocol, + u32 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); + +int rc_open(struct rc_dev *rdev) +{ + int rval = 0; + + if (!rdev) + return -EINVAL; + + mutex_lock(&rdev->lock); + if (!rdev->users++ && rdev->open != NULL) + rval = rdev->open(rdev); + + if (rval) + rdev->users--; + + mutex_unlock(&rdev->lock); + + return rval; +} +EXPORT_SYMBOL_GPL(rc_open); + +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 != NULL) + rdev->close(rdev); + + mutex_unlock(&rdev->lock); + } +} +EXPORT_SYMBOL_GPL(rc_close); + +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 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_SHARP, "sharp" }, + { RC_BIT_MCE_KBD, "mce_kbd" }, + { RC_BIT_LIRC, "lirc" }, + { RC_BIT_XMP, "xmp" }, +}; + +/** + * 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_PROTO_ATTR(_name, _mode, _show, _store, _type) \ + struct rc_filter_attribute dev_attr_##_name = { \ + .attr = __ATTR(_name, _mode, _show, _store), \ + .type = (_type), \ + } +#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/wakeup 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 trigged by reading /sys/class/rc/rc?/[wakeup_]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); + struct rc_filter_attribute *fattr = to_rc_filter_attr(mattr); + u64 allowed, enabled; + char *tmp = buf; + int i; + + /* Device is being removed */ + if (!dev) + return -EINVAL; + + mutex_lock(&dev->lock); + + if (fattr->type == RC_FILTER_NORMAL) { + enabled = dev->enabled_protocols; + allowed = dev->allowed_protocols; + if (dev->raw && !allowed) + allowed = ir_raw_get_allowed_protocols(); + } else { + enabled = dev->enabled_wakeup_protocols; + allowed = dev->allowed_wakeup_protocols; + } + + mutex_unlock(&dev->lock); + + IR_dprintk(1, "%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; + } + + if (tmp != buf) + tmp--; + *tmp = '\n'; + + return tmp + 1 - buf; +} + +/** + * parse_protocol_change() - parses a protocol change request + * @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(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)) { + IR_dprintk(1, "Unknown protocol: '%s'\n", tmp); + return -EINVAL; + } + + count++; + + if (enable) + *protocols |= mask; + else if (disable) + *protocols &= ~mask; + else + *protocols = mask; + } + + if (!count) { + IR_dprintk(1, "Protocol not specified\n"); + return -EINVAL; + } + + return count; +} + +/** + * 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 trigged 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 device + * registration, 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); + struct rc_filter_attribute *fattr = to_rc_filter_attr(mattr); + u64 *current_protocols; + int (*change_protocol)(struct rc_dev *dev, u64 *rc_type); + struct rc_scancode_filter *filter; + int (*set_filter)(struct rc_dev *dev, struct rc_scancode_filter *filter); + u64 old_protocols, new_protocols; + ssize_t rc; + + /* Device is being removed */ + if (!dev) + return -EINVAL; + + if (fattr->type == RC_FILTER_NORMAL) { + IR_dprintk(1, "Normal protocol change requested\n"); + current_protocols = &dev->enabled_protocols; + change_protocol = dev->change_protocol; + filter = &dev->scancode_filter; + set_filter = dev->s_filter; + } else { + IR_dprintk(1, "Wakeup protocol change requested\n"); + current_protocols = &dev->enabled_wakeup_protocols; + change_protocol = dev->change_wakeup_protocol; + filter = &dev->scancode_wakeup_filter; + set_filter = dev->s_wakeup_filter; + } + + if (!change_protocol) { + IR_dprintk(1, "Protocol switching not supported\n"); + return -EINVAL; + } + + mutex_lock(&dev->lock); + + old_protocols = *current_protocols; + new_protocols = old_protocols; + rc = parse_protocol_change(&new_protocols, buf); + if (rc < 0) + goto out; + + rc = change_protocol(dev, &new_protocols); + if (rc < 0) { + IR_dprintk(1, "Error setting protocols to 0x%llx\n", + (long long)new_protocols); + goto out; + } + + if (new_protocols != old_protocols) { + *current_protocols = new_protocols; + IR_dprintk(1, "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 (set_filter && filter->mask) { + if (new_protocols) + rc = set_filter(dev, filter); + else + rc = -1; + + if (rc < 0) { + filter->data = 0; + filter->mask = 0; + set_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 trigged 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 device registration, + * 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; + + /* Device is being removed */ + if (!dev) + return -EINVAL; + + if (fattr->type == RC_FILTER_NORMAL) + filter = &dev->scancode_filter; + else + filter = &dev->scancode_wakeup_filter; + + mutex_lock(&dev->lock); + 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 trigged 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 device registration, + * 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); + u64 *enabled_protocols; + + /* Device is being removed */ + if (!dev) + return -EINVAL; + + ret = kstrtoul(buf, 0, &val); + if (ret < 0) + return ret; + + if (fattr->type == RC_FILTER_NORMAL) { + set_filter = dev->s_filter; + enabled_protocols = &dev->enabled_protocols; + filter = &dev->scancode_filter; + } else { + set_filter = dev->s_wakeup_filter; + enabled_protocols = &dev->enabled_wakeup_protocols; + filter = &dev->scancode_wakeup_filter; + } + + if (!set_filter) + return -EINVAL; + + mutex_lock(&dev->lock); + + new_filter = *filter; + if (fattr->mask) + new_filter.mask = val; + else + new_filter.data = val; + + if (!*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; +} + +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 RC_PROTO_ATTR(protocols, S_IRUGO | S_IWUSR, + show_protocols, store_protocols, RC_FILTER_NORMAL); +static RC_PROTO_ATTR(wakeup_protocols, S_IRUGO | S_IWUSR, + show_protocols, store_protocols, RC_FILTER_WAKEUP); +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_protocol_attrs[] = { + &dev_attr_protocols.attr.attr, + NULL, +}; + +static struct attribute_group rc_dev_protocol_attr_grp = { + .attrs = rc_dev_protocol_attrs, +}; + +static struct attribute *rc_dev_wakeup_protocol_attrs[] = { + &dev_attr_wakeup_protocols.attr.attr, + NULL, +}; + +static struct attribute_group rc_dev_wakeup_protocol_attr_grp = { + .attrs = rc_dev_wakeup_protocol_attrs, +}; + +static struct attribute *rc_dev_filter_attrs[] = { + &dev_attr_filter.attr.attr, + &dev_attr_filter_mask.attr.attr, + NULL, +}; + +static 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, + NULL, +}; + +static struct attribute_group rc_dev_wakeup_filter_attr_grp = { + .attrs = rc_dev_wakeup_filter_attrs, +}; + +static struct device_type rc_dev_type = { + .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; + + 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? */ + struct rc_map *rc_map; + const char *path; + int rc, devno, attr = 0; + + 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; + + do { + devno = find_first_zero_bit(ir_core_dev_number, + IRRCV_NUM_DEVICES); + /* No free device slots */ + if (devno >= IRRCV_NUM_DEVICES) + return -ENOMEM; + } while (test_and_set_bit(devno, ir_core_dev_number)); + + dev->dev.groups = dev->sysfs_groups; + dev->sysfs_groups[attr++] = &rc_dev_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; + if (dev->change_wakeup_protocol) + dev->sysfs_groups[attr++] = &rc_dev_wakeup_protocol_attr_grp; + dev->sysfs_groups[attr++] = NULL; + + /* + * 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 = devno; + 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; + + /* input_register_device can call ir_open, so unlock mutex here */ + mutex_unlock(&dev->lock); + + rc = input_register_device(dev->input_dev); + + mutex_lock(&dev->lock); + + 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; + } + /* calls ir_register_device so unlock mutex here*/ + mutex_unlock(&dev->lock); + rc = ir_raw_event_register(dev); + mutex_lock(&dev->lock); + if (rc < 0) + goto out_input; + } + + if (dev->change_protocol) { + u64 rc_type = (1ll << rc_map->rc_type); + if (dev->driver_type == RC_DRIVER_IR_RAW) + rc_type |= RC_BIT_LIRC; + 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); + clear_bit(dev->devno, ir_core_dev_number); + 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); + + clear_bit(dev->devno, ir_core_dev_number); + + 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; + } + + led_trigger_register_simple("rc-feedback", &led_feedback); + rc_map_register(&empty_map); + + return 0; +} + +static void __exit rc_core_exit(void) +{ + class_unregister(&rc_class); + led_trigger_unregister_simple(led_feedback); + 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"); +MODULE_LICENSE("GPL"); |