| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * drivers/extcon/extcon.c - External Connector (extcon) framework. |
| * |
| * Copyright (C) 2015 Samsung Electronics |
| * Author: Chanwoo Choi <cw00.choi@samsung.com> |
| * |
| * 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> |
| */ |
| |
| #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/of.h> |
| #include <linux/slab.h> |
| #include <linux/sysfs.h> |
| |
| #include "extcon.h" |
| |
| #define SUPPORTED_CABLE_MAX 32 |
| |
| static const struct __extcon_info { |
| unsigned int type; |
| unsigned int id; |
| const char *name; |
| |
| } extcon_info[] = { |
| [EXTCON_NONE] = { |
| .type = EXTCON_TYPE_MISC, |
| .id = EXTCON_NONE, |
| .name = "NONE", |
| }, |
| |
| /* USB external connector */ |
| [EXTCON_USB] = { |
| .type = EXTCON_TYPE_USB, |
| .id = EXTCON_USB, |
| .name = "USB", |
| }, |
| [EXTCON_USB_HOST] = { |
| .type = EXTCON_TYPE_USB, |
| .id = EXTCON_USB_HOST, |
| .name = "USB-HOST", |
| }, |
| |
| /* Charging external connector */ |
| [EXTCON_CHG_USB_SDP] = { |
| .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, |
| .id = EXTCON_CHG_USB_SDP, |
| .name = "SDP", |
| }, |
| [EXTCON_CHG_USB_DCP] = { |
| .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, |
| .id = EXTCON_CHG_USB_DCP, |
| .name = "DCP", |
| }, |
| [EXTCON_CHG_USB_CDP] = { |
| .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, |
| .id = EXTCON_CHG_USB_CDP, |
| .name = "CDP", |
| }, |
| [EXTCON_CHG_USB_ACA] = { |
| .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, |
| .id = EXTCON_CHG_USB_ACA, |
| .name = "ACA", |
| }, |
| [EXTCON_CHG_USB_FAST] = { |
| .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, |
| .id = EXTCON_CHG_USB_FAST, |
| .name = "FAST-CHARGER", |
| }, |
| [EXTCON_CHG_USB_SLOW] = { |
| .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, |
| .id = EXTCON_CHG_USB_SLOW, |
| .name = "SLOW-CHARGER", |
| }, |
| [EXTCON_CHG_WPT] = { |
| .type = EXTCON_TYPE_CHG, |
| .id = EXTCON_CHG_WPT, |
| .name = "WPT", |
| }, |
| [EXTCON_CHG_USB_PD] = { |
| .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, |
| .id = EXTCON_CHG_USB_PD, |
| .name = "PD", |
| }, |
| |
| /* Jack external connector */ |
| [EXTCON_JACK_MICROPHONE] = { |
| .type = EXTCON_TYPE_JACK, |
| .id = EXTCON_JACK_MICROPHONE, |
| .name = "MICROPHONE", |
| }, |
| [EXTCON_JACK_HEADPHONE] = { |
| .type = EXTCON_TYPE_JACK, |
| .id = EXTCON_JACK_HEADPHONE, |
| .name = "HEADPHONE", |
| }, |
| [EXTCON_JACK_LINE_IN] = { |
| .type = EXTCON_TYPE_JACK, |
| .id = EXTCON_JACK_LINE_IN, |
| .name = "LINE-IN", |
| }, |
| [EXTCON_JACK_LINE_OUT] = { |
| .type = EXTCON_TYPE_JACK, |
| .id = EXTCON_JACK_LINE_OUT, |
| .name = "LINE-OUT", |
| }, |
| [EXTCON_JACK_VIDEO_IN] = { |
| .type = EXTCON_TYPE_JACK, |
| .id = EXTCON_JACK_VIDEO_IN, |
| .name = "VIDEO-IN", |
| }, |
| [EXTCON_JACK_VIDEO_OUT] = { |
| .type = EXTCON_TYPE_JACK, |
| .id = EXTCON_JACK_VIDEO_OUT, |
| .name = "VIDEO-OUT", |
| }, |
| [EXTCON_JACK_SPDIF_IN] = { |
| .type = EXTCON_TYPE_JACK, |
| .id = EXTCON_JACK_SPDIF_IN, |
| .name = "SPDIF-IN", |
| }, |
| [EXTCON_JACK_SPDIF_OUT] = { |
| .type = EXTCON_TYPE_JACK, |
| .id = EXTCON_JACK_SPDIF_OUT, |
| .name = "SPDIF-OUT", |
| }, |
| |
| /* Display external connector */ |
| [EXTCON_DISP_HDMI] = { |
| .type = EXTCON_TYPE_DISP, |
| .id = EXTCON_DISP_HDMI, |
| .name = "HDMI", |
| }, |
| [EXTCON_DISP_MHL] = { |
| .type = EXTCON_TYPE_DISP, |
| .id = EXTCON_DISP_MHL, |
| .name = "MHL", |
| }, |
| [EXTCON_DISP_DVI] = { |
| .type = EXTCON_TYPE_DISP, |
| .id = EXTCON_DISP_DVI, |
| .name = "DVI", |
| }, |
| [EXTCON_DISP_VGA] = { |
| .type = EXTCON_TYPE_DISP, |
| .id = EXTCON_DISP_VGA, |
| .name = "VGA", |
| }, |
| [EXTCON_DISP_DP] = { |
| .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB, |
| .id = EXTCON_DISP_DP, |
| .name = "DP", |
| }, |
| [EXTCON_DISP_HMD] = { |
| .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB, |
| .id = EXTCON_DISP_HMD, |
| .name = "HMD", |
| }, |
| [EXTCON_DISP_CVBS] = { |
| .type = EXTCON_TYPE_DISP, |
| .id = EXTCON_DISP_CVBS, |
| .name = "CVBS", |
| }, |
| [EXTCON_DISP_EDP] = { |
| .type = EXTCON_TYPE_DISP, |
| .id = EXTCON_DISP_EDP, |
| .name = "EDP", |
| }, |
| |
| /* Miscellaneous external connector */ |
| [EXTCON_DOCK] = { |
| .type = EXTCON_TYPE_MISC, |
| .id = EXTCON_DOCK, |
| .name = "DOCK", |
| }, |
| [EXTCON_JIG] = { |
| .type = EXTCON_TYPE_MISC, |
| .id = EXTCON_JIG, |
| .name = "JIG", |
| }, |
| [EXTCON_MECHANICAL] = { |
| .type = EXTCON_TYPE_MISC, |
| .id = EXTCON_MECHANICAL, |
| .name = "MECHANICAL", |
| }, |
| |
| { /* sentinel */ } |
| }; |
| |
| /** |
| * struct extcon_cable - An internal data for an external connector. |
| * @edev: the extcon device |
| * @cable_index: the index of this cable in the edev |
| * @attr_g: the attribute group for the cable |
| * @attr_name: "name" sysfs entry |
| * @attr_state: "state" sysfs entry |
| * @attrs: the array pointing to attr_name and attr_state for attr_g |
| * @usb_propval: the array of USB connector properties |
| * @chg_propval: the array of charger connector properties |
| * @jack_propval: the array of jack connector properties |
| * @disp_propval: the array of display connector properties |
| * @usb_bits: the bit array of the USB connector property capabilities |
| * @chg_bits: the bit array of the charger connector property capabilities |
| * @jack_bits: the bit array of the jack connector property capabilities |
| * @disp_bits: the bit array of the display connector property capabilities |
| */ |
| struct extcon_cable { |
| struct extcon_dev *edev; |
| int cable_index; |
| |
| struct attribute_group attr_g; |
| struct device_attribute attr_name; |
| struct device_attribute attr_state; |
| |
| struct attribute *attrs[3]; /* to be fed to attr_g.attrs */ |
| |
| union extcon_property_value usb_propval[EXTCON_PROP_USB_CNT]; |
| union extcon_property_value chg_propval[EXTCON_PROP_CHG_CNT]; |
| union extcon_property_value jack_propval[EXTCON_PROP_JACK_CNT]; |
| union extcon_property_value disp_propval[EXTCON_PROP_DISP_CNT]; |
| |
| unsigned long usb_bits[BITS_TO_LONGS(EXTCON_PROP_USB_CNT)]; |
| unsigned long chg_bits[BITS_TO_LONGS(EXTCON_PROP_CHG_CNT)]; |
| unsigned long jack_bits[BITS_TO_LONGS(EXTCON_PROP_JACK_CNT)]; |
| unsigned long disp_bits[BITS_TO_LONGS(EXTCON_PROP_DISP_CNT)]; |
| }; |
| |
| static struct class *extcon_class; |
| |
| static LIST_HEAD(extcon_dev_list); |
| static DEFINE_MUTEX(extcon_dev_list_lock); |
| |
| 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 int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id) |
| { |
| int i; |
| |
| /* Find the index of extcon cable in edev->supported_cable */ |
| for (i = 0; i < edev->max_supported; i++) { |
| if (edev->supported_cable[i] == id) |
| return i; |
| } |
| |
| return -EINVAL; |
| } |
| |
| static int get_extcon_type(unsigned int prop) |
| { |
| switch (prop) { |
| case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: |
| return EXTCON_TYPE_USB; |
| case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: |
| return EXTCON_TYPE_CHG; |
| case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: |
| return EXTCON_TYPE_JACK; |
| case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: |
| return EXTCON_TYPE_DISP; |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static bool is_extcon_attached(struct extcon_dev *edev, unsigned int index) |
| { |
| return !!(edev->state & BIT(index)); |
| } |
| |
| static bool is_extcon_changed(struct extcon_dev *edev, int index, |
| bool new_state) |
| { |
| int state = !!(edev->state & BIT(index)); |
| return (state != new_state); |
| } |
| |
| static bool is_extcon_property_supported(unsigned int id, unsigned int prop) |
| { |
| int type; |
| |
| /* Check whether the property is supported or not. */ |
| type = get_extcon_type(prop); |
| if (type < 0) |
| return false; |
| |
| /* Check whether a specific extcon id supports the property or not. */ |
| return !!(extcon_info[id].type & type); |
| } |
| |
| static int is_extcon_property_capability(struct extcon_dev *edev, |
| unsigned int id, int index,unsigned int prop) |
| { |
| struct extcon_cable *cable; |
| int type, ret; |
| |
| /* Check whether the property is supported or not. */ |
| type = get_extcon_type(prop); |
| if (type < 0) |
| return type; |
| |
| cable = &edev->cables[index]; |
| |
| switch (type) { |
| case EXTCON_TYPE_USB: |
| ret = test_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits); |
| break; |
| case EXTCON_TYPE_CHG: |
| ret = test_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits); |
| break; |
| case EXTCON_TYPE_JACK: |
| ret = test_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits); |
| break; |
| case EXTCON_TYPE_DISP: |
| ret = test_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits); |
| break; |
| default: |
| ret = -EINVAL; |
| } |
| |
| return ret; |
| } |
| |
| static void init_property(struct extcon_dev *edev, unsigned int id, int index) |
| { |
| unsigned int type = extcon_info[id].type; |
| struct extcon_cable *cable = &edev->cables[index]; |
| |
| if (EXTCON_TYPE_USB & type) |
| memset(cable->usb_propval, 0, sizeof(cable->usb_propval)); |
| if (EXTCON_TYPE_CHG & type) |
| memset(cable->chg_propval, 0, sizeof(cable->chg_propval)); |
| if (EXTCON_TYPE_JACK & type) |
| memset(cable->jack_propval, 0, sizeof(cable->jack_propval)); |
| if (EXTCON_TYPE_DISP & type) |
| memset(cable->disp_propval, 0, sizeof(cable->disp_propval)); |
| } |
| |
| static ssize_t state_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| int i, count = 0; |
| struct extcon_dev *edev = dev_get_drvdata(dev); |
| |
| if (edev->max_supported == 0) |
| return sprintf(buf, "%u\n", edev->state); |
| |
| for (i = 0; i < edev->max_supported; i++) { |
| count += sprintf(buf + count, "%s=%d\n", |
| extcon_info[edev->supported_cable[i]].name, |
| !!(edev->state & BIT(i))); |
| } |
| |
| return count; |
| } |
| static DEVICE_ATTR_RO(state); |
| |
| static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct extcon_dev *edev = dev_get_drvdata(dev); |
| |
| return sprintf(buf, "%s\n", edev->name); |
| } |
| static DEVICE_ATTR_RO(name); |
| |
| 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); |
| int i = cable->cable_index; |
| |
| return sprintf(buf, "%s\n", |
| extcon_info[cable->edev->supported_cable[i]].name); |
| } |
| |
| 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); |
| |
| int i = cable->cable_index; |
| |
| return sprintf(buf, "%d\n", |
| extcon_get_state(cable->edev, cable->edev->supported_cable[i])); |
| } |
| |
| /** |
| * extcon_sync() - Synchronize the state for an external connector. |
| * @edev: the extcon device |
| * @id: the unique id indicating an external connector |
| * |
| * Note that this function send a notification in order to synchronize |
| * the state and property of an external connector. |
| * |
| * Returns 0 if success or error number if fail. |
| */ |
| int extcon_sync(struct extcon_dev *edev, unsigned int id) |
| { |
| char name_buf[120]; |
| char state_buf[120]; |
| char *prop_buf; |
| char *envp[3]; |
| int env_offset = 0; |
| int length; |
| int index; |
| int state; |
| unsigned long flags; |
| |
| if (!edev) |
| return -EINVAL; |
| |
| index = find_cable_index_by_id(edev, id); |
| if (index < 0) |
| return index; |
| |
| spin_lock_irqsave(&edev->lock, flags); |
| state = !!(edev->state & BIT(index)); |
| spin_unlock_irqrestore(&edev->lock, flags); |
| |
| /* |
| * Call functions in a raw notifier chain for the specific one |
| * external connector. |
| */ |
| raw_notifier_call_chain(&edev->nh[index], state, edev); |
| |
| /* |
| * Call functions in a raw notifier chain for the all supported |
| * external connectors. |
| */ |
| raw_notifier_call_chain(&edev->nh_all, state, edev); |
| |
| spin_lock_irqsave(&edev->lock, flags); |
| /* This could be in interrupt handler */ |
| prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); |
| if (!prop_buf) { |
| /* 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); |
| |
| return -ENOMEM; |
| } |
| |
| 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); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(extcon_sync); |
| |
| /** |
| * extcon_get_state() - Get the state of an external connector. |
| * @edev: the extcon device |
| * @id: the unique id indicating an external connector |
| * |
| * Returns 0 if success or error number if fail. |
| */ |
| int extcon_get_state(struct extcon_dev *edev, const unsigned int id) |
| { |
| int index, state; |
| unsigned long flags; |
| |
| if (!edev) |
| return -EINVAL; |
| |
| index = find_cable_index_by_id(edev, id); |
| if (index < 0) |
| return index; |
| |
| spin_lock_irqsave(&edev->lock, flags); |
| state = is_extcon_attached(edev, index); |
| spin_unlock_irqrestore(&edev->lock, flags); |
| |
| return state; |
| } |
| EXPORT_SYMBOL_GPL(extcon_get_state); |
| |
| /** |
| * extcon_set_state() - Set the state of an external connector. |
| * @edev: the extcon device |
| * @id: the unique id indicating an external connector |
| * @state: the new state of an external connector. |
| * the default semantics is true: attached / false: detached. |
| * |
| * Note that this function set the state of an external connector without |
| * a notification. To synchronize the state of an external connector, |
| * have to use extcon_set_state_sync() and extcon_sync(). |
| * |
| * Returns 0 if success or error number if fail. |
| */ |
| int extcon_set_state(struct extcon_dev *edev, unsigned int id, bool state) |
| { |
| unsigned long flags; |
| int index, ret = 0; |
| |
| if (!edev) |
| return -EINVAL; |
| |
| index = find_cable_index_by_id(edev, id); |
| if (index < 0) |
| return index; |
| |
| spin_lock_irqsave(&edev->lock, flags); |
| |
| /* Check whether the external connector's state is changed. */ |
| if (!is_extcon_changed(edev, index, state)) |
| goto out; |
| |
| if (check_mutually_exclusive(edev, |
| (edev->state & ~BIT(index)) | (state & BIT(index)))) { |
| ret = -EPERM; |
| goto out; |
| } |
| |
| /* |
| * Initialize the value of extcon property before setting |
| * the detached state for an external connector. |
| */ |
| if (!state) |
| init_property(edev, id, index); |
| |
| /* Update the state for an external connector. */ |
| if (state) |
| edev->state |= BIT(index); |
| else |
| edev->state &= ~(BIT(index)); |
| out: |
| spin_unlock_irqrestore(&edev->lock, flags); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(extcon_set_state); |
| |
| /** |
| * extcon_set_state_sync() - Set the state of an external connector with sync. |
| * @edev: the extcon device |
| * @id: the unique id indicating an external connector |
| * @state: the new state of external connector. |
| * the default semantics is true: attached / false: detached. |
| * |
| * Note that this function set the state of external connector |
| * and synchronize the state by sending a notification. |
| * |
| * Returns 0 if success or error number if fail. |
| */ |
| int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id, bool state) |
| { |
| int ret; |
| |
| ret = extcon_set_state(edev, id, state); |
| if (ret < 0) |
| return ret; |
| |
| return extcon_sync(edev, id); |
| } |
| EXPORT_SYMBOL_GPL(extcon_set_state_sync); |
| |
| /** |
| * extcon_get_property() - Get the property value of an external connector. |
| * @edev: the extcon device |
| * @id: the unique id indicating an external connector |
| * @prop: the property id indicating an extcon property |
| * @prop_val: the pointer which store the value of extcon property |
| * |
| * Note that when getting the property value of external connector, |
| * the external connector should be attached. If detached state, function |
| * return 0 without property value. Also, the each property should be |
| * included in the list of supported properties according to extcon type. |
| * |
| * Returns 0 if success or error number if fail. |
| */ |
| int extcon_get_property(struct extcon_dev *edev, unsigned int id, |
| unsigned int prop, |
| union extcon_property_value *prop_val) |
| { |
| struct extcon_cable *cable; |
| unsigned long flags; |
| int index, ret = 0; |
| |
| *prop_val = (union extcon_property_value){0}; |
| |
| if (!edev) |
| return -EINVAL; |
| |
| /* Check whether the property is supported or not */ |
| if (!is_extcon_property_supported(id, prop)) |
| return -EINVAL; |
| |
| /* Find the cable index of external connector by using id */ |
| index = find_cable_index_by_id(edev, id); |
| if (index < 0) |
| return index; |
| |
| spin_lock_irqsave(&edev->lock, flags); |
| |
| /* Check whether the property is available or not. */ |
| if (!is_extcon_property_capability(edev, id, index, prop)) { |
| spin_unlock_irqrestore(&edev->lock, flags); |
| return -EPERM; |
| } |
| |
| /* |
| * Check whether the external connector is attached. |
| * If external connector is detached, the user can not |
| * get the property value. |
| */ |
| if (!is_extcon_attached(edev, index)) { |
| spin_unlock_irqrestore(&edev->lock, flags); |
| return 0; |
| } |
| |
| cable = &edev->cables[index]; |
| |
| /* Get the property value according to extcon type */ |
| switch (prop) { |
| case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: |
| *prop_val = cable->usb_propval[prop - EXTCON_PROP_USB_MIN]; |
| break; |
| case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: |
| *prop_val = cable->chg_propval[prop - EXTCON_PROP_CHG_MIN]; |
| break; |
| case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: |
| *prop_val = cable->jack_propval[prop - EXTCON_PROP_JACK_MIN]; |
| break; |
| case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: |
| *prop_val = cable->disp_propval[prop - EXTCON_PROP_DISP_MIN]; |
| break; |
| default: |
| ret = -EINVAL; |
| break; |
| } |
| |
| spin_unlock_irqrestore(&edev->lock, flags); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(extcon_get_property); |
| |
| /** |
| * extcon_set_property() - Set the property value of an external connector. |
| * @edev: the extcon device |
| * @id: the unique id indicating an external connector |
| * @prop: the property id indicating an extcon property |
| * @prop_val: the pointer including the new value of extcon property |
| * |
| * Note that each property should be included in the list of supported |
| * properties according to the extcon type. |
| * |
| * Returns 0 if success or error number if fail. |
| */ |
| int extcon_set_property(struct extcon_dev *edev, unsigned int id, |
| unsigned int prop, |
| union extcon_property_value prop_val) |
| { |
| struct extcon_cable *cable; |
| unsigned long flags; |
| int index, ret = 0; |
| |
| if (!edev) |
| return -EINVAL; |
| |
| /* Check whether the property is supported or not */ |
| if (!is_extcon_property_supported(id, prop)) |
| return -EINVAL; |
| |
| /* Find the cable index of external connector by using id */ |
| index = find_cable_index_by_id(edev, id); |
| if (index < 0) |
| return index; |
| |
| spin_lock_irqsave(&edev->lock, flags); |
| |
| /* Check whether the property is available or not. */ |
| if (!is_extcon_property_capability(edev, id, index, prop)) { |
| spin_unlock_irqrestore(&edev->lock, flags); |
| return -EPERM; |
| } |
| |
| cable = &edev->cables[index]; |
| |
| /* Set the property value according to extcon type */ |
| switch (prop) { |
| case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: |
| cable->usb_propval[prop - EXTCON_PROP_USB_MIN] = prop_val; |
| break; |
| case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: |
| cable->chg_propval[prop - EXTCON_PROP_CHG_MIN] = prop_val; |
| break; |
| case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: |
| cable->jack_propval[prop - EXTCON_PROP_JACK_MIN] = prop_val; |
| break; |
| case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: |
| cable->disp_propval[prop - EXTCON_PROP_DISP_MIN] = prop_val; |
| break; |
| default: |
| ret = -EINVAL; |
| break; |
| } |
| |
| spin_unlock_irqrestore(&edev->lock, flags); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(extcon_set_property); |
| |
| /** |
| * extcon_set_property_sync() - Set property of an external connector with sync. |
| * @edev: the extcon device |
| * @id: the unique id indicating an external connector |
| * @prop: the property id indicating an extcon property |
| * @prop_val: the pointer including the new value of extcon property |
| * |
| * Note that when setting the property value of external connector, |
| * the external connector should be attached. The each property should |
| * be included in the list of supported properties according to extcon type. |
| * |
| * Returns 0 if success or error number if fail. |
| */ |
| int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id, |
| unsigned int prop, |
| union extcon_property_value prop_val) |
| { |
| int ret; |
| |
| ret = extcon_set_property(edev, id, prop, prop_val); |
| if (ret < 0) |
| return ret; |
| |
| return extcon_sync(edev, id); |
| } |
| EXPORT_SYMBOL_GPL(extcon_set_property_sync); |
| |
| /** |
| * extcon_get_property_capability() - Get the capability of the property |
| * for an external connector. |
| * @edev: the extcon device |
| * @id: the unique id indicating an external connector |
| * @prop: the property id indicating an extcon property |
| * |
| * Returns 1 if the property is available or 0 if not available. |
| */ |
| int extcon_get_property_capability(struct extcon_dev *edev, unsigned int id, |
| unsigned int prop) |
| { |
| int index; |
| |
| if (!edev) |
| return -EINVAL; |
| |
| /* Check whether the property is supported or not */ |
| if (!is_extcon_property_supported(id, prop)) |
| return -EINVAL; |
| |
| /* Find the cable index of external connector by using id */ |
| index = find_cable_index_by_id(edev, id); |
| if (index < 0) |
| return index; |
| |
| return is_extcon_property_capability(edev, id, index, prop); |
| } |
| EXPORT_SYMBOL_GPL(extcon_get_property_capability); |
| |
| /** |
| * extcon_set_property_capability() - Set the capability of the property |
| * for an external connector. |
| * @edev: the extcon device |
| * @id: the unique id indicating an external connector |
| * @prop: the property id indicating an extcon property |
| * |
| * Note that this function set the capability of the property |
| * for an external connector in order to mark the bit in capability |
| * bitmap which mean the available state of the property. |
| * |
| * Returns 0 if success or error number if fail. |
| */ |
| int extcon_set_property_capability(struct extcon_dev *edev, unsigned int id, |
| unsigned int prop) |
| { |
| struct extcon_cable *cable; |
| int index, type, ret = 0; |
| |
| if (!edev) |
| return -EINVAL; |
| |
| /* Check whether the property is supported or not. */ |
| if (!is_extcon_property_supported(id, prop)) |
| return -EINVAL; |
| |
| /* Find the cable index of external connector by using id. */ |
| index = find_cable_index_by_id(edev, id); |
| if (index < 0) |
| return index; |
| |
| type = get_extcon_type(prop); |
| if (type < 0) |
| return type; |
| |
| cable = &edev->cables[index]; |
| |
| switch (type) { |
| case EXTCON_TYPE_USB: |
| __set_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits); |
| break; |
| case EXTCON_TYPE_CHG: |
| __set_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits); |
| break; |
| case EXTCON_TYPE_JACK: |
| __set_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits); |
| break; |
| case EXTCON_TYPE_DISP: |
| __set_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits); |
| break; |
| default: |
| ret = -EINVAL; |
| } |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(extcon_set_property_capability); |
| |
| /** |
| * extcon_get_extcon_dev() - Get the extcon device instance from the name. |
| * @extcon_name: the extcon name provided with extcon_dev_register() |
| * |
| * Return the pointer of extcon device if success or ERR_PTR(err) if fail. |
| * NOTE: This function returns -EPROBE_DEFER so it may only be called from |
| * probe() functions. |
| */ |
| struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) |
| { |
| struct extcon_dev *sd; |
| |
| if (!extcon_name) |
| return ERR_PTR(-EINVAL); |
| |
| mutex_lock(&extcon_dev_list_lock); |
| list_for_each_entry(sd, &extcon_dev_list, entry) { |
| if (!strcmp(sd->name, extcon_name)) |
| goto out; |
| } |
| sd = ERR_PTR(-EPROBE_DEFER); |
| out: |
| mutex_unlock(&extcon_dev_list_lock); |
| return sd; |
| } |
| EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); |
| |
| /** |
| * extcon_register_notifier() - Register a notifier block to get notified by |
| * any state changes from the extcon. |
| * @edev: the extcon device |
| * @id: the unique id indicating an external connector |
| * @nb: a notifier block to be registered |
| * |
| * Note that the second parameter given to the callback of nb (val) is |
| * the current state of an external connector and the third pameter |
| * is the pointer of extcon device. |
| * |
| * Returns 0 if success or error number if fail. |
| */ |
| int extcon_register_notifier(struct extcon_dev *edev, unsigned int id, |
| struct notifier_block *nb) |
| { |
| unsigned long flags; |
| int ret, idx; |
| |
| if (!edev || !nb) |
| return -EINVAL; |
| |
| idx = find_cable_index_by_id(edev, id); |
| if (idx < 0) |
| return idx; |
| |
| spin_lock_irqsave(&edev->lock, flags); |
| ret = raw_notifier_chain_register(&edev->nh[idx], nb); |
| spin_unlock_irqrestore(&edev->lock, flags); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(extcon_register_notifier); |
| |
| /** |
| * extcon_unregister_notifier() - Unregister a notifier block from the extcon. |
| * @edev: the extcon device |
| * @id: the unique id indicating an external connector |
| * @nb: a notifier block to be registered |
| * |
| * Returns 0 if success or error number if fail. |
| */ |
| int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id, |
| struct notifier_block *nb) |
| { |
| unsigned long flags; |
| int ret, idx; |
| |
| if (!edev || !nb) |
| return -EINVAL; |
| |
| idx = find_cable_index_by_id(edev, id); |
| if (idx < 0) |
| return idx; |
| |
| spin_lock_irqsave(&edev->lock, flags); |
| ret = raw_notifier_chain_unregister(&edev->nh[idx], nb); |
| spin_unlock_irqrestore(&edev->lock, flags); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(extcon_unregister_notifier); |
| |
| /** |
| * extcon_register_notifier_all() - Register a notifier block for all connectors. |
| * @edev: the extcon device |
| * @nb: a notifier block to be registered |
| * |
| * Note that this function registers a notifier block in order to receive |
| * the state change of all supported external connectors from extcon device. |
| * And the second parameter given to the callback of nb (val) is |
| * the current state and the third pameter is the pointer of extcon device. |
| * |
| * Returns 0 if success or error number if fail. |
| */ |
| int extcon_register_notifier_all(struct extcon_dev *edev, |
| struct notifier_block *nb) |
| { |
| unsigned long flags; |
| int ret; |
| |
| if (!edev || !nb) |
| return -EINVAL; |
| |
| spin_lock_irqsave(&edev->lock, flags); |
| ret = raw_notifier_chain_register(&edev->nh_all, nb); |
| spin_unlock_irqrestore(&edev->lock, flags); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(extcon_register_notifier_all); |
| |
| /** |
| * extcon_unregister_notifier_all() - Unregister a notifier block from extcon. |
| * @edev: the extcon device |
| * @nb: a notifier block to be registered |
| * |
| * Returns 0 if success or error number if fail. |
| */ |
| int extcon_unregister_notifier_all(struct extcon_dev *edev, |
| struct notifier_block *nb) |
| { |
| unsigned long flags; |
| int ret; |
| |
| if (!edev || !nb) |
| return -EINVAL; |
| |
| spin_lock_irqsave(&edev->lock, flags); |
| ret = raw_notifier_chain_unregister(&edev->nh_all, nb); |
| spin_unlock_irqrestore(&edev->lock, flags); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(extcon_unregister_notifier_all); |
| |
| static struct attribute *extcon_attrs[] = { |
| &dev_attr_state.attr, |
| &dev_attr_name.attr, |
| NULL, |
| }; |
| ATTRIBUTE_GROUPS(extcon); |
| |
| 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_groups = extcon_groups; |
| } |
| |
| return 0; |
| } |
| |
| static void extcon_dev_release(struct device *dev) |
| { |
| } |
| |
| static const char *muex_name = "mutually_exclusive"; |
| static void dummy_sysfs_dev_release(struct device *dev) |
| { |
| } |
| |
| /* |
| * extcon_dev_allocate() - Allocate the memory of extcon device. |
| * @supported_cable: the array of the supported external connectors |
| * ending with EXTCON_NONE. |
| * |
| * Note that this function allocates the memory for extcon device |
| * and initialize default setting for the extcon device. |
| * |
| * Returns the pointer memory of allocated extcon_dev if success |
| * or ERR_PTR(err) if fail. |
| */ |
| struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable) |
| { |
| struct extcon_dev *edev; |
| |
| if (!supported_cable) |
| return ERR_PTR(-EINVAL); |
| |
| edev = kzalloc(sizeof(*edev), GFP_KERNEL); |
| if (!edev) |
| return ERR_PTR(-ENOMEM); |
| |
| edev->max_supported = 0; |
| edev->supported_cable = supported_cable; |
| |
| return edev; |
| } |
| |
| /* |
| * extcon_dev_free() - Free the memory of extcon device. |
| * @edev: the extcon device |
| */ |
| void extcon_dev_free(struct extcon_dev *edev) |
| { |
| kfree(edev); |
| } |
| EXPORT_SYMBOL_GPL(extcon_dev_free); |
| |
| /** |
| * extcon_dev_register() - Register an new extcon device |
| * @edev: the extcon device to be registered |
| * |
| * Among the members of edev struct, please set the "user initializing data" |
| * do not set the values of "internal data", which are initialized by |
| * this function. |
| * |
| * Note that before calling this funciton, have to allocate the memory |
| * of an extcon device by using the extcon_dev_allocate(). And the extcon |
| * dev should include the supported_cable information. |
| * |
| * Returns 0 if success or error number if fail. |
| */ |
| int extcon_dev_register(struct extcon_dev *edev) |
| { |
| int ret, index = 0; |
| static atomic_t edev_no = ATOMIC_INIT(-1); |
| |
| if (!extcon_class) { |
| ret = create_extcon_class(); |
| if (ret < 0) |
| return ret; |
| } |
| |
| if (!edev || !edev->supported_cable) |
| return -EINVAL; |
| |
| for (; edev->supported_cable[index] != EXTCON_NONE; index++); |
| |
| edev->max_supported = index; |
| if (index > SUPPORTED_CABLE_MAX) { |
| dev_err(&edev->dev, |
| "exceed the maximum number of supported cables\n"); |
| return -EINVAL; |
| } |
| |
| edev->dev.class = extcon_class; |
| edev->dev.release = extcon_dev_release; |
| |
| edev->name = dev_name(edev->dev.parent); |
| if (IS_ERR_OR_NULL(edev->name)) { |
| dev_err(&edev->dev, |
| "extcon device name is null\n"); |
| return -EINVAL; |
| } |
| dev_set_name(&edev->dev, "extcon%lu", |
| (unsigned long)atomic_inc_return(&edev_no)); |
| |
| if (edev->max_supported) { |
| char *str; |
| struct extcon_cable *cable; |
| |
| edev->cables = kcalloc(edev->max_supported, |
| sizeof(struct extcon_cable), |
| GFP_KERNEL); |
| if (!edev->cables) { |
| ret = -ENOMEM; |
| goto err_sysfs_alloc; |
| } |
| for (index = 0; index < edev->max_supported; index++) { |
| cable = &edev->cables[index]; |
| |
| str = kasprintf(GFP_KERNEL, "cable.%d", index); |
| if (!str) { |
| for (index--; index >= 0; index--) { |
| cable = &edev->cables[index]; |
| kfree(cable->attr_g.name); |
| } |
| ret = -ENOMEM; |
| |
| goto err_alloc_cables; |
| } |
| |
| 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 = 0444; |
| cable->attr_state.show = cable_state_show; |
| } |
| } |
| |
| if (edev->max_supported && edev->mutually_exclusive) { |
| char *name; |
| |
| /* Count the size of mutually_exclusive array */ |
| for (index = 0; edev->mutually_exclusive[index]; index++) |
| ; |
| |
| edev->attrs_muex = kcalloc(index + 1, |
| sizeof(struct attribute *), |
| GFP_KERNEL); |
| if (!edev->attrs_muex) { |
| ret = -ENOMEM; |
| goto err_muex; |
| } |
| |
| edev->d_attrs_muex = kcalloc(index, |
| sizeof(struct device_attribute), |
| GFP_KERNEL); |
| if (!edev->d_attrs_muex) { |
| ret = -ENOMEM; |
| kfree(edev->attrs_muex); |
| goto err_muex; |
| } |
| |
| for (index = 0; edev->mutually_exclusive[index]; index++) { |
| name = kasprintf(GFP_KERNEL, "0x%x", |
| edev->mutually_exclusive[index]); |
| 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; |
| } |
| 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 = |
| kcalloc(edev->max_supported + 2, |
| sizeof(struct attribute_group *), |
| 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; |
| } |
| |
| spin_lock_init(&edev->lock); |
| if (edev->max_supported) { |
| edev->nh = kcalloc(edev->max_supported, sizeof(*edev->nh), |
| GFP_KERNEL); |
| if (!edev->nh) { |
| ret = -ENOMEM; |
| goto err_alloc_nh; |
| } |
| } |
| |
| for (index = 0; index < edev->max_supported; index++) |
| RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]); |
| |
| RAW_INIT_NOTIFIER_HEAD(&edev->nh_all); |
| |
| dev_set_drvdata(&edev->dev, edev); |
| edev->state = 0; |
| |
| ret = device_register(&edev->dev); |
| if (ret) { |
| put_device(&edev->dev); |
| goto err_dev; |
| } |
| |
| 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->nh); |
| err_alloc_nh: |
| 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: |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(extcon_dev_register); |
| |
| /** |
| * extcon_dev_unregister() - Unregister the extcon device. |
| * @edev: the extcon device 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; |
| |
| if (!edev) |
| return; |
| |
| 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; |
| } |
| |
| device_unregister(&edev->dev); |
| |
| 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); |
| kfree(edev->nh); |
| } |
| |
| put_device(&edev->dev); |
| } |
| EXPORT_SYMBOL_GPL(extcon_dev_unregister); |
| |
| #ifdef CONFIG_OF |
| |
| /* |
| * extcon_find_edev_by_node - Find the extcon device from devicetree. |
| * @node : OF node identifying edev |
| * |
| * Return the pointer of extcon device if success or ERR_PTR(err) if fail. |
| */ |
| struct extcon_dev *extcon_find_edev_by_node(struct device_node *node) |
| { |
| struct extcon_dev *edev; |
| |
| mutex_lock(&extcon_dev_list_lock); |
| list_for_each_entry(edev, &extcon_dev_list, entry) |
| if (edev->dev.parent && edev->dev.parent->of_node == node) |
| goto out; |
| edev = ERR_PTR(-EPROBE_DEFER); |
| out: |
| mutex_unlock(&extcon_dev_list_lock); |
| |
| return edev; |
| } |
| |
| /* |
| * extcon_get_edev_by_phandle - Get the extcon device from devicetree. |
| * @dev : the instance to the given device |
| * @index : the index into list of extcon_dev |
| * |
| * Return the pointer of extcon device if success or ERR_PTR(err) if fail. |
| */ |
| struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) |
| { |
| struct device_node *node; |
| struct extcon_dev *edev; |
| |
| if (!dev) |
| return ERR_PTR(-EINVAL); |
| |
| if (!dev->of_node) { |
| dev_dbg(dev, "device does not have a device node entry\n"); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| node = of_parse_phandle(dev->of_node, "extcon", index); |
| if (!node) { |
| dev_dbg(dev, "failed to get phandle in %pOF node\n", |
| dev->of_node); |
| return ERR_PTR(-ENODEV); |
| } |
| |
| edev = extcon_find_edev_by_node(node); |
| of_node_put(node); |
| |
| return edev; |
| } |
| |
| #else |
| |
| struct extcon_dev *extcon_find_edev_by_node(struct device_node *node) |
| { |
| return ERR_PTR(-ENOSYS); |
| } |
| |
| struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) |
| { |
| return ERR_PTR(-ENOSYS); |
| } |
| |
| #endif /* CONFIG_OF */ |
| |
| EXPORT_SYMBOL_GPL(extcon_find_edev_by_node); |
| EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle); |
| |
| /** |
| * extcon_get_edev_name() - Get the name of the extcon device. |
| * @edev: the extcon device |
| */ |
| const char *extcon_get_edev_name(struct extcon_dev *edev) |
| { |
| return !edev ? NULL : edev->name; |
| } |
| EXPORT_SYMBOL_GPL(extcon_get_edev_name); |
| |
| 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("Chanwoo Choi <cw00.choi@samsung.com>"); |
| MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); |
| MODULE_DESCRIPTION("External Connector (extcon) framework"); |
| MODULE_LICENSE("GPL v2"); |