v4.19.13 snapshot.
diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
new file mode 100644
index 0000000..b9d27c8
--- /dev/null
+++ b/drivers/extcon/extcon.c
@@ -0,0 +1,1440 @@
+/*
+ * 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>
+ *
+ * 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/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",
+ },
+
+ /* 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
+ */
+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 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
+ *
+ * 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, index;
+ unsigned long flags;
+
+ index = find_cable_index_by_id(edev, id);
+ if (index < 0)
+ return index;
+
+ /* Check whether the external connector's state is changed. */
+ spin_lock_irqsave(&edev->lock, flags);
+ ret = is_extcon_changed(edev, index, state);
+ spin_unlock_irqrestore(&edev->lock, flags);
+ if (!ret)
+ return 0;
+
+ 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.
+ * @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.
+ */
+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 = NULL;
+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 = -EINVAL;
+
+ 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 buf[10];
+ 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];
+
+ snprintf(buf, 10, "cable.%d", index);
+ str = kzalloc(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 = 0444;
+ cable->attr_state.show = cable_state_show;
+ }
+ }
+
+ 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 = 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++) {
+ sprintf(buf, "0x%x", edev->mutually_exclusive[index]);
+ name = kzalloc(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 =
+ 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;
+ }
+
+ ret = device_register(&edev->dev);
+ if (ret) {
+ put_device(&edev->dev);
+ goto err_dev;
+ }
+
+ spin_lock_init(&edev->lock);
+ edev->nh = devm_kcalloc(&edev->dev, edev->max_supported,
+ sizeof(*edev->nh), GFP_KERNEL);
+ if (!edev->nh) {
+ ret = -ENOMEM;
+ goto err_dev;
+ }
+
+ 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;
+
+ 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:
+ 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);
+ }
+
+ 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;
+}
+
+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");