| /* |
| * 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[][CABLE_NAME_MAX + 1] = { |
| [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", |
| }; |
| |
| 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 weight; |
| u32 correspondants = new_state & edev->mutually_exclusive[i]; |
| |
| /* calculate the total number of bits set */ |
| weight = hweight32(correspondants); |
| if (weight > 1) |
| return i + 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_set_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_set_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 -EINVAL; |
| |
| 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_dev_release(struct device *dev) |
| { |
| kfree(dev); |
| } |
| |
| 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) |
| { |
| int index; |
| |
| mutex_lock(&extcon_dev_list_lock); |
| list_del(&edev->entry); |
| mutex_unlock(&extcon_dev_list_lock); |
| |
| if (IS_ERR_OR_NULL(get_device(edev->dev))) { |
| dev_err(edev->dev, "Failed to unregister extcon_dev (%s)\n", |
| dev_name(edev->dev)); |
| return; |
| } |
| |
| 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); |
| } |
| |
| #if defined(CONFIG_ANDROID) |
| if (switch_class) |
| class_compat_remove_link(switch_class, edev->dev, NULL); |
| #endif |
| device_unregister(edev->dev); |
| put_device(edev->dev); |
| } |
| 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) |
| { |
| #if defined(CONFIG_ANDROID) |
| class_compat_unregister(switch_class); |
| #endif |
| 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"); |