Merge tag 'char-misc-4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char/misc driver updates from Greg KH:
 "Here is the big char/misc driver update for 4.8-rc1.

  Not a lot of stuff, but it's all over the place, full details are in
  the shortlog.  All of these have been in linux-next with no reported
  issues for a while"

* tag 'char-misc-4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (49 commits)
  lkdtm: silence warnings about function declarations
  lkdtm: hide unused functions
  intel_th: pci: Add Kaby Lake PCH-H support
  intel_th: Fix a deadlock in modprobing
  dsp56k: prevent a harmless underflow
  chardev: add missing line break in pr_warn
  lkdtm: use struct arrays instead of enums
  lkdtm: move jprobe entry points to start of source
  lkdtm: reorganize module paramaters
  lkdtm: rename globals for clarity
  lkdtm: rename "count" to "crash_count"
  lkdtm: remove intentional off-by-one array access
  lkdtm: split remaining logic bug tests to separate file
  lkdtm: split heap corruption tests to separate file
  lkdtm: split memory permissions tests to separate file
  lkdtm: split usercopy tests to separate file
  lkdtm: drop "alloc_size" parameter
  lkdtm: add usercopy test for blocking kernel text
  extcon: adc-jack: add suspend/resume support
  extcon: add missing of_node_put after calling of_parse_phandle
  ...

33 files changed, 2147 insertions, 1608 deletions

diff --git a/Documentation/devicetree/bindings/extcon/extcon-arizona.txt b/Documentation/devicetree/bindings/extcon/extcon-arizona.txt
index e27341f8a4c7..7f3d94ae81ff 100644
--- a/Documentation/devicetree/bindings/extcon/extcon-arizona.txt
+++ b/Documentation/devicetree/bindings/extcon/extcon-arizona.txt
@@ -46,7 +46,8 @@ Optional properties:
     The second cell represents the MICBIAS to be used.
     The third cell represents the value of the micd-pol-gpio pin.
 
-  - wlf,gpsw : Settings for the general purpose switch
+  - wlf,gpsw : Settings for the general purpose switch, set as one of the
+    ARIZONA_GPSW_XXX defines.
 
 Example:
 
diff --git a/MAINTAINERS b/MAINTAINERS
index 8c20323d1277..6d3e135677a7 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6970,7 +6970,7 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching.git
 LINUX KERNEL DUMP TEST MODULE (LKDTM)
 M:	Kees Cook <keescook@chromium.org>
 S:	Maintained
-F:	drivers/misc/lkdtm.c
+F:	drivers/misc/lkdtm*
 
 LLC (802.2)
 M:	Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
diff --git a/drivers/char/dsp56k.c b/drivers/char/dsp56k.c
index 8bf70e8c3f79..50aa9ba91f25 100644
--- a/drivers/char/dsp56k.c
+++ b/drivers/char/dsp56k.c
@@ -325,7 +325,7 @@ static long dsp56k_ioctl(struct file *file, unsigned int cmd,
 			if(get_user(bin, &binary->bin) < 0)
 				return -EFAULT;
 		
-			if (len == 0) {
+			if (len <= 0) {
 				return -EINVAL;      /* nothing to upload?!? */
 			}
 			if (len > DSP56K_MAX_BINARY_LENGTH) {
diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile
index 2a0e4f45d5b2..972c813c375b 100644
--- a/drivers/extcon/Makefile
+++ b/drivers/extcon/Makefile
@@ -2,7 +2,8 @@
 # Makefile for external connector class (extcon) devices
 #
 
-obj-$(CONFIG_EXTCON)		+= extcon.o
+obj-$(CONFIG_EXTCON)		+= extcon-core.o
+extcon-core-objs		+= extcon.o devres.o
 obj-$(CONFIG_EXTCON_ADC_JACK)	+= extcon-adc-jack.o
 obj-$(CONFIG_EXTCON_ARIZONA)	+= extcon-arizona.o
 obj-$(CONFIG_EXTCON_AXP288)	+= extcon-axp288.o
diff --git a/drivers/extcon/devres.c b/drivers/extcon/devres.c
new file mode 100644
index 000000000000..e686acd1c459
--- /dev/null
+++ b/drivers/extcon/devres.c
@@ -0,0 +1,216 @@
+/*
+ *  drivers/extcon/devres.c - EXTCON device's resource management
+ *
+ * Copyright (C) 2016 Samsung Electronics
+ * Author: Chanwoo Choi <cw00.choi@samsung.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/extcon.h>
+
+static int devm_extcon_dev_match(struct device *dev, void *res, void *data)
+{
+	struct extcon_dev **r = res;
+
+	if (WARN_ON(!r || !*r))
+		return 0;
+
+	return *r == data;
+}
+
+static void devm_extcon_dev_release(struct device *dev, void *res)
+{
+	extcon_dev_free(*(struct extcon_dev **)res);
+}
+
+
+static void devm_extcon_dev_unreg(struct device *dev, void *res)
+{
+	extcon_dev_unregister(*(struct extcon_dev **)res);
+}
+
+struct extcon_dev_notifier_devres {
+	struct extcon_dev *edev;
+	unsigned int id;
+	struct notifier_block *nb;
+};
+
+static void devm_extcon_dev_notifier_unreg(struct device *dev, void *res)
+{
+	struct extcon_dev_notifier_devres *this = res;
+
+	extcon_unregister_notifier(this->edev, this->id, this->nb);
+}
+
+/**
+ * devm_extcon_dev_allocate - Allocate managed extcon device
+ * @dev:		device owning the extcon device being created
+ * @supported_cable:	Array of supported extcon ending with EXTCON_NONE.
+ *			If supported_cable is NULL, cable name related APIs
+ *			are disabled.
+ *
+ * This function manages automatically the memory of extcon device using device
+ * resource management and simplify the control of freeing the memory of extcon
+ * device.
+ *
+ * Returns the pointer memory of allocated extcon_dev if success
+ * or ERR_PTR(err) if fail
+ */
+struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
+					const unsigned int *supported_cable)
+{
+	struct extcon_dev **ptr, *edev;
+
+	ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return ERR_PTR(-ENOMEM);
+
+	edev = extcon_dev_allocate(supported_cable);
+	if (IS_ERR(edev)) {
+		devres_free(ptr);
+		return edev;
+	}
+
+	edev->dev.parent = dev;
+
+	*ptr = edev;
+	devres_add(dev, ptr);
+
+	return edev;
+}
+EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate);
+
+/**
+ * devm_extcon_dev_free() - Resource-managed extcon_dev_unregister()
+ * @dev:	device the extcon belongs to
+ * @edev:	the extcon device to unregister
+ *
+ * Free the memory that is allocated with devm_extcon_dev_allocate()
+ * function.
+ */
+void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev)
+{
+	WARN_ON(devres_release(dev, devm_extcon_dev_release,
+			       devm_extcon_dev_match, edev));
+}
+EXPORT_SYMBOL_GPL(devm_extcon_dev_free);
+
+/**
+ * devm_extcon_dev_register() - Resource-managed extcon_dev_register()
+ * @dev:	device to allocate extcon device
+ * @edev:	the new extcon device to register
+ *
+ * Managed extcon_dev_register() function. If extcon device is attached with
+ * this function, that extcon device is automatically unregistered on driver
+ * detach. Internally this function calls extcon_dev_register() function.
+ * To get more information, refer that function.
+ *
+ * If extcon device is registered with this function and the device needs to be
+ * unregistered separately, devm_extcon_dev_unregister() should be used.
+ *
+ * Returns 0 if success or negaive error number if failure.
+ */
+int devm_extcon_dev_register(struct device *dev, struct extcon_dev *edev)
+{
+	struct extcon_dev **ptr;
+	int ret;
+
+	ptr = devres_alloc(devm_extcon_dev_unreg, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return -ENOMEM;
+
+	ret = extcon_dev_register(edev);
+	if (ret) {
+		devres_free(ptr);
+		return ret;
+	}
+
+	*ptr = edev;
+	devres_add(dev, ptr);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(devm_extcon_dev_register);
+
+/**
+ * devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister()
+ * @dev:	device the extcon belongs to
+ * @edev:	the extcon device to unregister
+ *
+ * Unregister extcon device that is registered with devm_extcon_dev_register()
+ * function.
+ */
+void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev)
+{
+	WARN_ON(devres_release(dev, devm_extcon_dev_unreg,
+			       devm_extcon_dev_match, edev));
+}
+EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister);
+
+/**
+ * devm_extcon_register_notifier() - Resource-managed extcon_register_notifier()
+ * @dev:	device to allocate extcon device
+ * @edev:	the extcon device that has the external connecotr.
+ * @id:		the unique id of each external connector in extcon enumeration.
+ * @nb:		a notifier block to be registered.
+ *
+ * This function manages automatically the notifier of extcon device using
+ * device resource management and simplify the control of unregistering
+ * the notifier of extcon device.
+ *
+ * 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.
+ *
+ * Returns 0 if success or negaive error number if failure.
+ */
+int devm_extcon_register_notifier(struct device *dev, struct extcon_dev *edev,
+				unsigned int id, struct notifier_block *nb)
+{
+	struct extcon_dev_notifier_devres *ptr;
+	int ret;
+
+	ptr = devres_alloc(devm_extcon_dev_notifier_unreg, sizeof(*ptr),
+				GFP_KERNEL);
+	if (!ptr)
+		return -ENOMEM;
+
+	ret = extcon_register_notifier(edev, id, nb);
+	if (ret) {
+		devres_free(ptr);
+		return ret;
+	}
+
+	ptr->edev = edev;
+	ptr->id = id;
+	ptr->nb = nb;
+	devres_add(dev, ptr);
+
+	return 0;
+}
+EXPORT_SYMBOL(devm_extcon_register_notifier);
+
+/**
+ * devm_extcon_unregister_notifier()
+			- Resource-managed extcon_unregister_notifier()
+ * @dev:	device to allocate extcon device
+ * @edev:	the extcon device that has the external connecotr.
+ * @id:		the unique id of each external connector in extcon enumeration.
+ * @nb:		a notifier block to be registered.
+ */
+void devm_extcon_unregister_notifier(struct device *dev,
+				struct extcon_dev *edev, unsigned int id,
+				struct notifier_block *nb)
+{
+	WARN_ON(devres_release(dev, devm_extcon_dev_notifier_unreg,
+			       devm_extcon_dev_match, edev));
+}
+EXPORT_SYMBOL(devm_extcon_unregister_notifier);
diff --git a/drivers/extcon/extcon-adc-jack.c b/drivers/extcon/extcon-adc-jack.c
index 7fc0ae1912f8..44e48aa78a84 100644
--- a/drivers/extcon/extcon-adc-jack.c
+++ b/drivers/extcon/extcon-adc-jack.c
@@ -38,6 +38,7 @@
  * @chan:		iio channel being queried.
  */
 struct adc_jack_data {
+	struct device *dev;
 	struct extcon_dev *edev;
 
 	const unsigned int **cable_names;
@@ -49,6 +50,7 @@ struct adc_jack_data {
 	struct delayed_work handler;
 
 	struct iio_channel *chan;
+	bool wakeup_source;
 };
 
 static void adc_jack_handler(struct work_struct *work)
@@ -105,6 +107,7 @@ static int adc_jack_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
+	data->dev = &pdev->dev;
 	data->edev = devm_extcon_dev_allocate(&pdev->dev, pdata->cable_names);
 	if (IS_ERR(data->edev)) {
 		dev_err(&pdev->dev, "failed to allocate extcon device\n");
@@ -128,6 +131,7 @@ static int adc_jack_probe(struct platform_device *pdev)
 		return PTR_ERR(data->chan);
 
 	data->handling_delay = msecs_to_jiffies(pdata->handling_delay_ms);
+	data->wakeup_source = pdata->wakeup_source;
 
 	INIT_DEFERRABLE_WORK(&data->handler, adc_jack_handler);
 
@@ -151,6 +155,9 @@ static int adc_jack_probe(struct platform_device *pdev)
 		return err;
 	}
 
+	if (data->wakeup_source)
+		device_init_wakeup(&pdev->dev, 1);
+
 	return 0;
 }
 
@@ -165,11 +172,38 @@ static int adc_jack_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int adc_jack_suspend(struct device *dev)
+{
+	struct adc_jack_data *data = dev_get_drvdata(dev);
+
+	cancel_delayed_work_sync(&data->handler);
+	if (device_may_wakeup(data->dev))
+		enable_irq_wake(data->irq);
+
+	return 0;
+}
+
+static int adc_jack_resume(struct device *dev)
+{
+	struct adc_jack_data *data = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(data->dev))
+		disable_irq_wake(data->irq);
+
+	return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static SIMPLE_DEV_PM_OPS(adc_jack_pm_ops,
+		adc_jack_suspend, adc_jack_resume);
+
 static struct platform_driver adc_jack_driver = {
 	.probe          = adc_jack_probe,
 	.remove         = adc_jack_remove,
 	.driver         = {
 		.name   = "adc-jack",
+		.pm = &adc_jack_pm_ops,
 	},
 };
 
diff --git a/drivers/extcon/extcon-usb-gpio.c b/drivers/extcon/extcon-usb-gpio.c
index 2b2fecffb1ad..2512660dc4b9 100644
--- a/drivers/extcon/extcon-usb-gpio.c
+++ b/drivers/extcon/extcon-usb-gpio.c
@@ -24,8 +24,10 @@
 #include <linux/module.h>
 #include <linux/of_gpio.h>
 #include <linux/platform_device.h>
+#include <linux/pm_wakeirq.h>
 #include <linux/slab.h>
 #include <linux/workqueue.h>
+#include <linux/acpi.h>
 
 #define USB_GPIO_DEBOUNCE_MS	20	/* ms */
 
@@ -91,7 +93,7 @@ static int usb_extcon_probe(struct platform_device *pdev)
 	struct usb_extcon_info *info;
 	int ret;
 
-	if (!np)
+	if (!np && !ACPI_HANDLE(dev))
 		return -EINVAL;
 
 	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
@@ -141,7 +143,8 @@ static int usb_extcon_probe(struct platform_device *pdev)
 	}
 
 	platform_set_drvdata(pdev, info);
-	device_init_wakeup(dev, 1);
+	device_init_wakeup(dev, true);
+	dev_pm_set_wake_irq(dev, info->id_irq);
 
 	/* Perform initial detection */
 	usb_extcon_detect_cable(&info->wq_detcable.work);
@@ -155,6 +158,9 @@ static int usb_extcon_remove(struct platform_device *pdev)
 
 	cancel_delayed_work_sync(&info->wq_detcable);
 
+	dev_pm_clear_wake_irq(&pdev->dev);
+	device_init_wakeup(&pdev->dev, false);
+
 	return 0;
 }
 
@@ -164,12 +170,6 @@ static int usb_extcon_suspend(struct device *dev)
 	struct usb_extcon_info *info = dev_get_drvdata(dev);
 	int ret = 0;
 
-	if (device_may_wakeup(dev)) {
-		ret = enable_irq_wake(info->id_irq);
-		if (ret)
-			return ret;
-	}
-
 	/*
 	 * We don't want to process any IRQs after this point
 	 * as GPIOs used behind I2C subsystem might not be
@@ -185,13 +185,10 @@ static int usb_extcon_resume(struct device *dev)
 	struct usb_extcon_info *info = dev_get_drvdata(dev);
 	int ret = 0;
 
-	if (device_may_wakeup(dev)) {
-		ret = disable_irq_wake(info->id_irq);
-		if (ret)
-			return ret;
-	}
-
 	enable_irq(info->id_irq);
+	if (!device_may_wakeup(dev))
+		queue_delayed_work(system_power_efficient_wq,
+				   &info->wq_detcable, 0);
 
 	return ret;
 }
@@ -206,6 +203,12 @@ static const struct of_device_id usb_extcon_dt_match[] = {
 };
 MODULE_DEVICE_TABLE(of, usb_extcon_dt_match);
 
+static const struct platform_device_id usb_extcon_platform_ids[] = {
+	{ .name = "extcon-usb-gpio", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, usb_extcon_platform_ids);
+
 static struct platform_driver usb_extcon_driver = {
 	.probe		= usb_extcon_probe,
 	.remove		= usb_extcon_remove,
@@ -214,6 +217,7 @@ static struct platform_driver usb_extcon_driver = {
 		.pm	= &usb_extcon_pm_ops,
 		.of_match_table = usb_extcon_dt_match,
 	},
+	.id_table = usb_extcon_platform_ids,
 };
 
 module_platform_driver(usb_extcon_driver);
diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
index 21a123cadf78..8682efc0f57b 100644
--- a/drivers/extcon/extcon.c
+++ b/drivers/extcon/extcon.c
@@ -77,6 +77,26 @@ static const char *extcon_name[] =  {
 	NULL,
 };
 
+/**
+ * struct extcon_cable - An internal data for each cable of extcon device.
+ * @edev:		The extcon device
+ * @cable_index:	Index of this cable in the edev
+ * @attr_g:		Attribute group for the cable
+ * @attr_name:		"name" sysfs entry
+ * @attr_state:		"state" sysfs entry
+ * @attrs:		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 */
+};
+
 static struct class *extcon_class;
 #if defined(CONFIG_ANDROID)
 static struct class_compat *switch_class;
@@ -127,38 +147,6 @@ static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id
 	return -EINVAL;
 }
 
-static int find_cable_id_by_name(struct extcon_dev *edev, const char *name)
-{
-	int id = -EINVAL;
-	int i = 0;
-
-	/* Find the id of extcon cable */
-	while (extcon_name[i]) {
-		if (!strncmp(extcon_name[i], name, CABLE_NAME_MAX)) {
-			id = i;
-			break;
-		}
-		i++;
-	}
-
-	return id;
-}
-
-static int find_cable_index_by_name(struct extcon_dev *edev, const char *name)
-{
-	int id;
-
-	if (edev->max_supported == 0)
-		return -EINVAL;
-
-	/* Find the the number of extcon cable */
-	id = find_cable_id_by_name(edev, name);
-	if (id < 0)
-		return id;
-
-	return find_cable_index_by_id(edev, id);
-}
-
 static bool is_extcon_changed(u32 prev, u32 new, int idx, bool *attached)
 {
 	if (((prev >> idx) & 0x1) != ((new >> idx) & 0x1)) {
@@ -374,25 +362,6 @@ int extcon_get_cable_state_(struct extcon_dev *edev, const unsigned int id)
 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)
-{
-	int id;
-
-	id = find_cable_id_by_name(edev, cable_name);
-	if (id < 0)
-		return id;
-
-	return extcon_get_cable_state_(edev, id);
-}
-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.
  * @id:			the unique id of each external connector
@@ -422,28 +391,6 @@ int extcon_set_cable_state_(struct extcon_dev *edev, unsigned int id,
 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)
-{
-	int id;
-
-	id = find_cable_id_by_name(edev, cable_name);
-	if (id < 0)
-		return id;
-
-	return extcon_set_cable_state_(edev, id, 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()
  */
@@ -467,105 +414,6 @@ out:
 EXPORT_SYMBOL_GPL(extcon_get_extcon_dev);
 
 /**
- * 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.
- *			if NULL, extcon_register_interest will register
- *			every cable with the target cable_name given.
- * @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)
-{
-	unsigned long flags;
-	int ret;
-
-	if (!obj || !cable_name || !nb)
-		return -EINVAL;
-
-	if (extcon_name) {
-		obj->edev = extcon_get_extcon_dev(extcon_name);
-		if (!obj->edev)
-			return -ENODEV;
-
-		obj->cable_index = find_cable_index_by_name(obj->edev,
-							cable_name);
-		if (obj->cable_index < 0)
-			return obj->cable_index;
-
-		obj->user_nb = nb;
-
-		spin_lock_irqsave(&obj->edev->lock, flags);
-		ret = raw_notifier_chain_register(
-					&obj->edev->nh[obj->cable_index],
-					obj->user_nb);
-		spin_unlock_irqrestore(&obj->edev->lock, flags);
-	} else {
-		struct class_dev_iter iter;
-		struct extcon_dev *extd;
-		struct device *dev;
-
-		if (!extcon_class)
-			return -ENODEV;
-		class_dev_iter_init(&iter, extcon_class, NULL, NULL);
-		while ((dev = class_dev_iter_next(&iter))) {
-			extd = dev_get_drvdata(dev);
-
-			if (find_cable_index_by_name(extd, cable_name) < 0)
-				continue;
-
-			class_dev_iter_exit(&iter);
-			return extcon_register_interest(obj, extd->name,
-						cable_name, nb);
-		}
-
-		ret = -ENODEV;
-	}
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(extcon_register_interest);
-
-/**
- * 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)
-{
-	unsigned long flags;
-	int ret;
-
-	if (!obj)
-		return -EINVAL;
-
-	spin_lock_irqsave(&obj->edev->lock, flags);
-	ret = raw_notifier_chain_unregister(
-			&obj->edev->nh[obj->cable_index], obj->user_nb);
-	spin_unlock_irqrestore(&obj->edev->lock, flags);
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(extcon_unregister_interest);
-
-/**
  * extcon_register_notifier() - Register a notifiee to get notified by
  *				any attach status changes from the extcon.
  * @edev:	the extcon device that has the external connecotr.
@@ -582,14 +430,35 @@ int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
 	unsigned long flags;
 	int ret, idx;
 
-	if (!edev || !nb)
+	if (!nb)
 		return -EINVAL;
 
-	idx = find_cable_index_by_id(edev, id);
+	if (edev) {
+		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);
+		spin_lock_irqsave(&edev->lock, flags);
+		ret = raw_notifier_chain_register(&edev->nh[idx], nb);
+		spin_unlock_irqrestore(&edev->lock, flags);
+	} else {
+		struct extcon_dev *extd;
+
+		mutex_lock(&extcon_dev_list_lock);
+		list_for_each_entry(extd, &extcon_dev_list, entry) {
+			idx = find_cable_index_by_id(extd, id);
+			if (idx >= 0)
+				break;
+		}
+		mutex_unlock(&extcon_dev_list_lock);
+
+		if (idx >= 0) {
+			edev = extd;
+			return extcon_register_notifier(extd, id, nb);
+		} else {
+			ret = -ENODEV;
+		}
+	}
 
 	return ret;
 }
@@ -611,6 +480,8 @@ int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
 		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);
@@ -693,66 +564,6 @@ void extcon_dev_free(struct extcon_dev *edev)
 }
 EXPORT_SYMBOL_GPL(extcon_dev_free);
 
-static int devm_extcon_dev_match(struct device *dev, void *res, void *data)
-{
-	struct extcon_dev **r = res;
-
-	if (WARN_ON(!r || !*r))
-		return 0;
-
-	return *r == data;
-}
-
-static void devm_extcon_dev_release(struct device *dev, void *res)
-{
-	extcon_dev_free(*(struct extcon_dev **)res);
-}
-
-/**
- * devm_extcon_dev_allocate - Allocate managed extcon device
- * @dev:		device owning the extcon device being created
- * @supported_cable:	Array of supported extcon ending with EXTCON_NONE.
- *			If supported_cable is NULL, cable name related APIs
- *			are disabled.
- *
- * This function manages automatically the memory of extcon device using device
- * resource management and simplify the control of freeing the memory of extcon
- * device.
- *
- * Returns the pointer memory of allocated extcon_dev if success
- * or ERR_PTR(err) if fail
- */
-struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
-					const unsigned int *supported_cable)
-{
-	struct extcon_dev **ptr, *edev;
-
-	ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL);
-	if (!ptr)
-		return ERR_PTR(-ENOMEM);
-
-	edev = extcon_dev_allocate(supported_cable);
-	if (IS_ERR(edev)) {
-		devres_free(ptr);
-		return edev;
-	}
-
-	edev->dev.parent = dev;
-
-	*ptr = edev;
-	devres_add(dev, ptr);
-
-	return edev;
-}
-EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate);
-
-void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev)
-{
-	WARN_ON(devres_release(dev, devm_extcon_dev_release,
-			       devm_extcon_dev_match, edev));
-}
-EXPORT_SYMBOL_GPL(devm_extcon_dev_free);