/* 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 #include #include #include #include #include #include #include #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(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); 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 * @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); 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 * @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); 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_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? */ struct rc_map *rc_map; const char *path; int rc, devno; 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); 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->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; } 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); 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");