diff options
Diffstat (limited to 'drivers/extcon/extcon-class.c')
| -rw-r--r-- | drivers/extcon/extcon-class.c | 836 |
1 files changed, 836 insertions, 0 deletions
diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c new file mode 100644 index 00000000000..946a3188b2b --- /dev/null +++ b/drivers/extcon/extcon-class.c @@ -0,0 +1,836 @@ +/* + * drivers/extcon/extcon_class.c + * + * External connector (extcon) class driver + * + * Copyright (C) 2012 Samsung Electronics + * Author: Donggeun Kim <dg77.kim@samsung.com> + * Author: MyungJoo Ham <myungjoo.ham@samsung.com> + * + * based on android/drivers/switch/switch_class.c + * Copyright (C) 2008 Google, Inc. + * Author: Mike Lockwood <lockwood@android.com> + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * +*/ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/init.h> +#include <linux/device.h> +#include <linux/fs.h> +#include <linux/err.h> +#include <linux/extcon.h> +#include <linux/slab.h> +#include <linux/sysfs.h> + +/* + * extcon_cable_name suggests the standard cable names for commonly used + * cable types. + * + * However, please do not use extcon_cable_name directly for extcon_dev + * struct's supported_cable pointer unless your device really supports + * every single port-type of the following cable names. Please choose cable + * names that are actually used in your extcon device. + */ +const char *extcon_cable_name[] = { + [EXTCON_USB] = "USB", + [EXTCON_USB_HOST] = "USB-Host", + [EXTCON_TA] = "TA", + [EXTCON_FAST_CHARGER] = "Fast-charger", + [EXTCON_SLOW_CHARGER] = "Slow-charger", + [EXTCON_CHARGE_DOWNSTREAM] = "Charge-downstream", + [EXTCON_HDMI] = "HDMI", + [EXTCON_MHL] = "MHL", + [EXTCON_DVI] = "DVI", + [EXTCON_VGA] = "VGA", + [EXTCON_DOCK] = "Dock", + [EXTCON_LINE_IN] = "Line-in", + [EXTCON_LINE_OUT] = "Line-out", + [EXTCON_MIC_IN] = "Microphone", + [EXTCON_HEADPHONE_OUT] = "Headphone", + [EXTCON_SPDIF_IN] = "SPDIF-in", + [EXTCON_SPDIF_OUT] = "SPDIF-out", + [EXTCON_VIDEO_IN] = "Video-in", + [EXTCON_VIDEO_OUT] = "Video-out", + [EXTCON_MECHANICAL] = "Mechanical", + + NULL, +}; + +static struct class *extcon_class; +#if defined(CONFIG_ANDROID) +static struct class_compat *switch_class; +#endif /* CONFIG_ANDROID */ + +static LIST_HEAD(extcon_dev_list); +static DEFINE_MUTEX(extcon_dev_list_lock); + +/** + * check_mutually_exclusive - Check if new_state violates mutually_exclusive + * condition. + * @edev: the extcon device + * @new_state: new cable attach status for @edev + * + * Returns 0 if nothing violates. Returns the index + 1 for the first + * violated condition. + */ +static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state) +{ + int i = 0; + + if (!edev->mutually_exclusive) + return 0; + + for (i = 0; edev->mutually_exclusive[i]; i++) { + int count = 0, j; + u32 correspondants = new_state & edev->mutually_exclusive[i]; + u32 exp = 1; + + for (j = 0; j < 32; j++) { + if (exp & correspondants) + count++; + if (count > 1) + return i + 1; + exp <<= 1; + } + } + + return 0; +} + +static ssize_t state_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + int i, count = 0; + struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev); + + if (edev->print_state) { + int ret = edev->print_state(edev, buf); + + if (ret >= 0) + return ret; + /* Use default if failed */ + } + + if (edev->max_supported == 0) + return sprintf(buf, "%u\n", edev->state); + + for (i = 0; i < SUPPORTED_CABLE_MAX; i++) { + if (!edev->supported_cable[i]) + break; + count += sprintf(buf + count, "%s=%d\n", + edev->supported_cable[i], + !!(edev->state & (1 << i))); + } + + return count; +} + +int extcon_set_state(struct extcon_dev *edev, u32 state); +static ssize_t state_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + u32 state; + ssize_t ret = 0; + struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev); + + ret = sscanf(buf, "0x%x", &state); + if (ret == 0) + ret = -EINVAL; + else + ret = extcon_set_state(edev, state); + + if (ret < 0) + return ret; + + return count; +} + +static ssize_t name_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev); + + /* Optional callback given by the user */ + if (edev->print_name) { + int ret = edev->print_name(edev, buf); + if (ret >= 0) + return ret; + } + + return sprintf(buf, "%s\n", dev_name(edev->dev)); +} + +static ssize_t cable_name_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct extcon_cable *cable = container_of(attr, struct extcon_cable, + attr_name); + + return sprintf(buf, "%s\n", + cable->edev->supported_cable[cable->cable_index]); +} + +static ssize_t cable_state_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct extcon_cable *cable = container_of(attr, struct extcon_cable, + attr_state); + + return sprintf(buf, "%d\n", + extcon_get_cable_state_(cable->edev, + cable->cable_index)); +} + +static ssize_t cable_state_store(struct device *dev, + struct device_attribute *attr, const char *buf, + size_t count) +{ + struct extcon_cable *cable = container_of(attr, struct extcon_cable, + attr_state); + int ret, state; + + ret = sscanf(buf, "%d", &state); + if (ret == 0) + ret = -EINVAL; + else + ret = extcon_set_cable_state_(cable->edev, cable->cable_index, + state); + + if (ret < 0) + return ret; + return count; +} + +/** + * extcon_update_state() - Update the cable attach states of the extcon device + * only for the masked bits. + * @edev: the extcon device + * @mask: the bit mask to designate updated bits. + * @state: new cable attach status for @edev + * + * Changing the state sends uevent with environment variable containing + * the name of extcon device (envp[0]) and the state output (envp[1]). + * Tizen uses this format for extcon device to get events from ports. + * Android uses this format as well. + * + * Note that the notifier provides which bits are changed in the state + * variable with the val parameter (second) to the callback. + */ +int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state) +{ + char name_buf[120]; + char state_buf[120]; + char *prop_buf; + char *envp[3]; + int env_offset = 0; + int length; + unsigned long flags; + + spin_lock_irqsave(&edev->lock, flags); + + if (edev->state != ((edev->state & ~mask) | (state & mask))) { + u32 old_state = edev->state; + + if (check_mutually_exclusive(edev, (edev->state & ~mask) | + (state & mask))) { + spin_unlock_irqrestore(&edev->lock, flags); + return -EPERM; + } + + edev->state &= ~mask; + edev->state |= state & mask; + + raw_notifier_call_chain(&edev->nh, old_state, edev); + + /* This could be in interrupt handler */ + prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); + if (prop_buf) { + length = name_show(edev->dev, NULL, prop_buf); + if (length > 0) { + if (prop_buf[length - 1] == '\n') + prop_buf[length - 1] = 0; + snprintf(name_buf, sizeof(name_buf), + "NAME=%s", prop_buf); + envp[env_offset++] = name_buf; + } + length = state_show(edev->dev, NULL, prop_buf); + if (length > 0) { + if (prop_buf[length - 1] == '\n') + prop_buf[length - 1] = 0; + snprintf(state_buf, sizeof(state_buf), + "STATE=%s", prop_buf); + envp[env_offset++] = state_buf; + } + envp[env_offset] = NULL; + /* Unlock early before uevent */ + spin_unlock_irqrestore(&edev->lock, flags); + + kobject_uevent_env(&edev->dev->kobj, KOBJ_CHANGE, envp); + free_page((unsigned long)prop_buf); + } else { + /* Unlock early before uevent */ + spin_unlock_irqrestore(&edev->lock, flags); + + dev_err(edev->dev, "out of memory in extcon_set_state\n"); + kobject_uevent(&edev->dev->kobj, KOBJ_CHANGE); + } + } else { + /* No changes */ + spin_unlock_irqrestore(&edev->lock, flags); + } + + return 0; +} +EXPORT_SYMBOL_GPL(extcon_update_state); + +/** + * extcon_set_state() - Set the cable attach states of the extcon device. + * @edev: the extcon device + * @state: new cable attach status for @edev + * + * Note that notifier provides which bits are changed in the state + * variable with the val parameter (second) to the callback. + */ +int extcon_set_state(struct extcon_dev *edev, u32 state) +{ + return extcon_update_state(edev, 0xffffffff, state); +} +EXPORT_SYMBOL_GPL(extcon_set_state); + +/** + * extcon_find_cable_index() - Get the cable index based on the cable name. + * @edev: the extcon device that has the cable. + * @cable_name: cable name to be searched. + * + * Note that accessing a cable state based on cable_index is faster than + * cable_name because using cable_name induces a loop with strncmp(). + * Thus, when get/set_cable_state is repeatedly used, using cable_index + * is recommended. + */ +int extcon_find_cable_index(struct extcon_dev *edev, const char *cable_name) +{ + int i; + + if (edev->supported_cable) { + for (i = 0; edev->supported_cable[i]; i++) { + if (!strncmp(edev->supported_cable[i], + cable_name, CABLE_NAME_MAX)) + return i; + } + } + + return -EINVAL; +} +EXPORT_SYMBOL_GPL(extcon_find_cable_index); + +/** + * extcon_get_cable_state_() - Get the status of a specific cable. + * @edev: the extcon device that has the cable. + * @index: cable index that can be retrieved by extcon_find_cable_index(). + */ +int extcon_get_cable_state_(struct extcon_dev *edev, int index) +{ + if (index < 0 || (edev->max_supported && edev->max_supported <= index)) + return -EINVAL; + + return !!(edev->state & (1 << index)); +} +EXPORT_SYMBOL_GPL(extcon_get_cable_state_); + +/** + * extcon_get_cable_state() - Get the status of a specific cable. + * @edev: the extcon device that has the cable. + * @cable_name: cable name. + * + * Note that this is slower than extcon_get_cable_state_. + */ +int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name) +{ + return extcon_get_cable_state_(edev, extcon_find_cable_index + (edev, cable_name)); +} +EXPORT_SYMBOL_GPL(extcon_get_cable_state); + +/** + * extcon_get_cable_state_() - Set the status of a specific cable. + * @edev: the extcon device that has the cable. + * @index: cable index that can be retrieved by extcon_find_cable_index(). + * @cable_state: the new cable status. The default semantics is + * true: attached / false: detached. + */ +int extcon_set_cable_state_(struct extcon_dev *edev, + int index, bool cable_state) +{ + u32 state; + + if (index < 0 || (edev->max_supported && edev->max_supported <= index)) + return -EINVAL; + + state = cable_state ? (1 << index) : 0; + return extcon_update_state(edev, 1 << index, state); +} +EXPORT_SYMBOL_GPL(extcon_set_cable_state_); + +/** + * extcon_get_cable_state() - Set the status of a specific cable. + * @edev: the extcon device that has the cable. + * @cable_name: cable name. + * @cable_state: the new cable status. The default semantics is + * true: attached / false: detached. + * + * Note that this is slower than extcon_set_cable_state_. + */ +int extcon_set_cable_state(struct extcon_dev *edev, + const char *cable_name, bool cable_state) +{ + return extcon_set_cable_state_(edev, extcon_find_cable_index + (edev, cable_name), cable_state); +} +EXPORT_SYMBOL_GPL(extcon_set_cable_state); + +/** + * extcon_get_extcon_dev() - Get the extcon device instance from the name + * @extcon_name: The extcon name provided with extcon_dev_register() + */ +struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) +{ + struct extcon_dev *sd; + + mutex_lock(&extcon_dev_list_lock); + list_for_each_entry(sd, &extcon_dev_list, entry) { + if (!strcmp(sd->name, extcon_name)) + goto out; + } + sd = NULL; +out: + mutex_unlock(&extcon_dev_list_lock); + return sd; +} +EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); + +static int _call_per_cable(struct notifier_block *nb, unsigned long val, + void *ptr) +{ + struct extcon_specific_cable_nb *obj = container_of(nb, + struct extcon_specific_cable_nb, internal_nb); + struct extcon_dev *edev = ptr; + + if ((val & (1 << obj->cable_index)) != + (edev->state & (1 << obj->cable_index))) { + bool cable_state = true; + + obj->previous_value = val; + + if (val & (1 << obj->cable_index)) + cable_state = false; + + return obj->user_nb->notifier_call(obj->user_nb, + cable_state, ptr); + } + + return NOTIFY_OK; +} + +/** + * extcon_register_interest() - Register a notifier for a state change of a + * specific cable, not an entier set of cables of a + * extcon device. + * @obj: an empty extcon_specific_cable_nb object to be returned. + * @extcon_name: the name of extcon device. + * @cable_name: the target cable name. + * @nb: the notifier block to get notified. + * + * Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets + * the struct for you. + * + * extcon_register_interest is a helper function for those who want to get + * notification for a single specific cable's status change. If a user wants + * to get notification for any changes of all cables of a extcon device, + * he/she should use the general extcon_register_notifier(). + * + * Note that the second parameter given to the callback of nb (val) is + * "old_state", not the current state. The current state can be retrieved + * by looking at the third pameter (edev pointer)'s state value. + */ +int extcon_register_interest(struct extcon_specific_cable_nb *obj, + const char *extcon_name, const char *cable_name, + struct notifier_block *nb) +{ + if (!obj || !extcon_name || !cable_name || !nb) + return -EINVAL; + + obj->edev = extcon_get_extcon_dev(extcon_name); + if (!obj->edev) + return -ENODEV; + + obj->cable_index = extcon_find_cable_index(obj->edev, cable_name); + if (obj->cable_index < 0) + return -ENODEV; + + obj->user_nb = nb; + + obj->internal_nb.notifier_call = _call_per_cable; + + return raw_notifier_chain_register(&obj->edev->nh, &obj->internal_nb); +} + +/** + * extcon_unregister_interest() - Unregister the notifier registered by + * extcon_register_interest(). + * @obj: the extcon_specific_cable_nb object returned by + * extcon_register_interest(). + */ +int extcon_unregister_interest(struct extcon_specific_cable_nb *obj) +{ + if (!obj) + return -EINVAL; + + return raw_notifier_chain_unregister(&obj->edev->nh, &obj->internal_nb); +} + +/** + * extcon_register_notifier() - Register a notifiee to get notified by + * any attach status changes from the extcon. + * @edev: the extcon device. + * @nb: a notifier block to be registered. + * + * Note that the second parameter given to the callback of nb (val) is + * "old_state", not the current state. The current state can be retrieved + * by looking at the third pameter (edev pointer)'s state value. + */ +int extcon_register_notifier(struct extcon_dev *edev, + struct notifier_block *nb) +{ + return raw_notifier_chain_register(&edev->nh, nb); +} +EXPORT_SYMBOL_GPL(extcon_register_notifier); + +/** + * extcon_unregister_notifier() - Unregister a notifiee from the extcon device. + * @edev: the extcon device. + * @nb: a registered notifier block to be unregistered. + */ +int extcon_unregister_notifier(struct extcon_dev *edev, + struct notifier_block *nb) +{ + return raw_notifier_chain_unregister(&edev->nh, nb); +} +EXPORT_SYMBOL_GPL(extcon_unregister_notifier); + +static struct device_attribute extcon_attrs[] = { + __ATTR(state, S_IRUGO | S_IWUSR, state_show, state_store), + __ATTR_RO(name), + __ATTR_NULL, +}; + +static int create_extcon_class(void) +{ + if (!extcon_class) { + extcon_class = class_create(THIS_MODULE, "extcon"); + if (IS_ERR(extcon_class)) + return PTR_ERR(extcon_class); + extcon_class->dev_attrs = extcon_attrs; + +#if defined(CONFIG_ANDROID) + switch_class = class_compat_register("switch"); + if (WARN(!switch_class, "cannot allocate")) + return -ENOMEM; +#endif /* CONFIG_ANDROID */ + } + + return 0; +} + +static void extcon_cleanup(struct extcon_dev *edev, bool skip) +{ + mutex_lock(&extcon_dev_list_lock); + list_del(&edev->entry); + mutex_unlock(&extcon_dev_list_lock); + + if (!skip && get_device(edev->dev)) { + int index; + + if (edev->mutually_exclusive && edev->max_supported) { + for (index = 0; edev->mutually_exclusive[index]; + index++) + kfree(edev->d_attrs_muex[index].attr.name); + kfree(edev->d_attrs_muex); + kfree(edev->attrs_muex); + } + + for (index = 0; index < edev->max_supported; index++) + kfree(edev->cables[index].attr_g.name); + + if (edev->max_supported) { + kfree(edev->extcon_dev_type.groups); + kfree(edev->cables); + } + + device_unregister(edev->dev); + put_device(edev->dev); + } + + kfree(edev->dev); +} + +static void extcon_dev_release(struct device *dev) +{ + struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev); + + extcon_cleanup(edev, true); +} + +static const char *muex_name = "mutually_exclusive"; +static void dummy_sysfs_dev_release(struct device *dev) +{ +} + +/** + * extcon_dev_register() - Register a new extcon device + * @edev : the new extcon device (should be allocated before calling) + * @dev : the parent device for this extcon device. + * + * Among the members of edev struct, please set the "user initializing data" + * in any case and set the "optional callbacks" if required. However, please + * do not set the values of "internal data", which are initialized by + * this function. + */ +int extcon_dev_register(struct extcon_dev *edev, struct device *dev) +{ + int ret, index = 0; + + if (!extcon_class) { + ret = create_extcon_class(); + if (ret < 0) + return ret; + } + + if (edev->supported_cable) { + /* Get size of array */ + for (index = 0; edev->supported_cable[index]; index++) + ; + edev->max_supported = index; + } else { + edev->max_supported = 0; + } + + if (index > SUPPORTED_CABLE_MAX) { + dev_err(edev->dev, "extcon: maximum number of supported cables exceeded.\n"); + return -EINVAL; + } + + edev->dev = kzalloc(sizeof(struct device), GFP_KERNEL); + if (!edev->dev) + return -ENOMEM; + edev->dev->parent = dev; + edev->dev->class = extcon_class; + edev->dev->release = extcon_dev_release; + + dev_set_name(edev->dev, edev->name ? edev->name : dev_name(dev)); + + if (edev->max_supported) { + char buf[10]; + char *str; + struct extcon_cable *cable; + + edev->cables = kzalloc(sizeof(struct extcon_cable) * + edev->max_supported, GFP_KERNEL); + if (!edev->cables) { + ret = -ENOMEM; + goto err_sysfs_alloc; + } + for (index = 0; index < edev->max_supported; index++) { + cable = &edev->cables[index]; + + snprintf(buf, 10, "cable.%d", index); + str = kzalloc(sizeof(char) * (strlen(buf) + 1), + GFP_KERNEL); + if (!str) { + for (index--; index >= 0; index--) { + cable = &edev->cables[index]; + kfree(cable->attr_g.name); + } + ret = -ENOMEM; + + goto err_alloc_cables; + } + strcpy(str, buf); + + cable->edev = edev; + cable->cable_index = index; + cable->attrs[0] = &cable->attr_name.attr; + cable->attrs[1] = &cable->attr_state.attr; + cable->attrs[2] = NULL; + cable->attr_g.name = str; + cable->attr_g.attrs = cable->attrs; + + sysfs_attr_init(&cable->attr_name.attr); + cable->attr_name.attr.name = "name"; + cable->attr_name.attr.mode = 0444; + cable->attr_name.show = cable_name_show; + + sysfs_attr_init(&cable->attr_state.attr); + cable->attr_state.attr.name = "state"; + cable->attr_state.attr.mode = 0644; + cable->attr_state.show = cable_state_show; + cable->attr_state.store = cable_state_store; + } + } + + if (edev->max_supported && edev->mutually_exclusive) { + char buf[80]; + char *name; + + /* Count the size of mutually_exclusive array */ + for (index = 0; edev->mutually_exclusive[index]; index++) + ; + + edev->attrs_muex = kzalloc(sizeof(struct attribute *) * + (index + 1), GFP_KERNEL); + if (!edev->attrs_muex) { + ret = -ENOMEM; + goto err_muex; + } + + edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) * + index, GFP_KERNEL); + if (!edev->d_attrs_muex) { + ret = -ENOMEM; + kfree(edev->attrs_muex); + goto err_muex; + } + + for (index = 0; edev->mutually_exclusive[index]; index++) { + sprintf(buf, "0x%x", edev->mutually_exclusive[index]); + name = kzalloc(sizeof(char) * (strlen(buf) + 1), + GFP_KERNEL); + if (!name) { + for (index--; index >= 0; index--) { + kfree(edev->d_attrs_muex[index].attr. + name); + } + kfree(edev->d_attrs_muex); + kfree(edev->attrs_muex); + ret = -ENOMEM; + goto err_muex; + } + strcpy(name, buf); + sysfs_attr_init(&edev->d_attrs_muex[index].attr); + edev->d_attrs_muex[index].attr.name = name; + edev->d_attrs_muex[index].attr.mode = 0000; + edev->attrs_muex[index] = &edev->d_attrs_muex[index] + .attr; + } + edev->attr_g_muex.name = muex_name; + edev->attr_g_muex.attrs = edev->attrs_muex; + + } + + if (edev->max_supported) { + edev->extcon_dev_type.groups = + kzalloc(sizeof(struct attribute_group *) * + (edev->max_supported + 2), GFP_KERNEL); + if (!edev->extcon_dev_type.groups) { + ret = -ENOMEM; + goto err_alloc_groups; + } + + edev->extcon_dev_type.name = dev_name(edev->dev); + edev->extcon_dev_type.release = dummy_sysfs_dev_release; + + for (index = 0; index < edev->max_supported; index++) + edev->extcon_dev_type.groups[index] = + &edev->cables[index].attr_g; + if (edev->mutually_exclusive) + edev->extcon_dev_type.groups[index] = + &edev->attr_g_muex; + + edev->dev->type = &edev->extcon_dev_type; + } + + ret = device_register(edev->dev); + if (ret) { + put_device(edev->dev); + goto err_dev; + } +#if defined(CONFIG_ANDROID) + if (switch_class) + ret = class_compat_create_link(switch_class, edev->dev, + NULL); +#endif /* CONFIG_ANDROID */ + + spin_lock_init(&edev->lock); + + RAW_INIT_NOTIFIER_HEAD(&edev->nh); + + dev_set_drvdata(edev->dev, edev); + edev->state = 0; + + mutex_lock(&extcon_dev_list_lock); + list_add(&edev->entry, &extcon_dev_list); + mutex_unlock(&extcon_dev_list_lock); + + return 0; + +err_dev: + if (edev->max_supported) + kfree(edev->extcon_dev_type.groups); +err_alloc_groups: + if (edev->max_supported && edev->mutually_exclusive) { + for (index = 0; edev->mutually_exclusive[index]; index++) + kfree(edev->d_attrs_muex[index].attr.name); + kfree(edev->d_attrs_muex); + kfree(edev->attrs_muex); + } +err_muex: + for (index = 0; index < edev->max_supported; index++) + kfree(edev->cables[index].attr_g.name); +err_alloc_cables: + if (edev->max_supported) + kfree(edev->cables); +err_sysfs_alloc: + kfree(edev->dev); + return ret; +} +EXPORT_SYMBOL_GPL(extcon_dev_register); + +/** + * extcon_dev_unregister() - Unregister the extcon device. + * @edev: the extcon device instance to be unregistered. + * + * Note that this does not call kfree(edev) because edev was not allocated + * by this class. + */ +void extcon_dev_unregister(struct extcon_dev *edev) +{ + extcon_cleanup(edev, false); +} +EXPORT_SYMBOL_GPL(extcon_dev_unregister); + +static int __init extcon_class_init(void) +{ + return create_extcon_class(); +} +module_init(extcon_class_init); + +static void __exit extcon_class_exit(void) +{ + class_destroy(extcon_class); +} +module_exit(extcon_class_exit); + +MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); +MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); +MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); +MODULE_DESCRIPTION("External connector (extcon) class driver"); +MODULE_LICENSE("GPL"); |