/*
- * drivers/extcon/extcon_class.c
+ * drivers/extcon/extcon.c - External Connector (extcon) framework.
*
* External connector (extcon) class driver
*
+ * 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>
* 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/slab.h>
#include <linux/sysfs.h>
-/*
- * extcon_cable_name suggests the standard cable names for commonly used
- * cable types.
- *
- * However, please do not use extcon_cable_name directly for extcon_dev
- * struct's supported_cable pointer unless your device really supports
- * every single port-type of the following cable names. Please choose cable
- * names that are actually used in your extcon device.
- */
-const char extcon_cable_name[][CABLE_NAME_MAX + 1] = {
+#define SUPPORTED_CABLE_MAX 32
+#define CABLE_NAME_MAX 30
+
+static const char *extcon_name[] = {
+ [EXTCON_NONE] = "NONE",
+
+ /* USB external connector */
[EXTCON_USB] = "USB",
- [EXTCON_USB_HOST] = "USB-Host",
+ [EXTCON_USB_HOST] = "USB-HOST",
+
+ /* Charger external connector */
[EXTCON_TA] = "TA",
- [EXTCON_FAST_CHARGER] = "Fast-charger",
- [EXTCON_SLOW_CHARGER] = "Slow-charger",
- [EXTCON_CHARGE_DOWNSTREAM] = "Charge-downstream",
+ [EXTCON_FAST_CHARGER] = "FAST-CHARGER",
+ [EXTCON_SLOW_CHARGER] = "SLOW-CHARGER",
+ [EXTCON_CHARGE_DOWNSTREAM] = "CHARGE-DOWNSTREAM",
+
+ /* Audio/Video external connector */
+ [EXTCON_LINE_IN] = "LINE-IN",
+ [EXTCON_LINE_OUT] = "LINE-OUT",
+ [EXTCON_MICROPHONE] = "MICROPHONE",
+ [EXTCON_HEADPHONE] = "HEADPHONE",
+
[EXTCON_HDMI] = "HDMI",
[EXTCON_MHL] = "MHL",
[EXTCON_DVI] = "DVI",
[EXTCON_VGA] = "VGA",
- [EXTCON_DOCK] = "Dock",
- [EXTCON_LINE_IN] = "Line-in",
- [EXTCON_LINE_OUT] = "Line-out",
- [EXTCON_MIC_IN] = "Microphone",
- [EXTCON_HEADPHONE_OUT] = "Headphone",
- [EXTCON_SPDIF_IN] = "SPDIF-in",
- [EXTCON_SPDIF_OUT] = "SPDIF-out",
- [EXTCON_VIDEO_IN] = "Video-in",
- [EXTCON_VIDEO_OUT] = "Video-out",
- [EXTCON_MECHANICAL] = "Mechanical",
+ [EXTCON_SPDIF_IN] = "SPDIF-IN",
+ [EXTCON_SPDIF_OUT] = "SPDIF-OUT",
+ [EXTCON_VIDEO_IN] = "VIDEO-IN",
+ [EXTCON_VIDEO_OUT] = "VIDEO-OUT",
+
+ /* Etc external connector */
+ [EXTCON_DOCK] = "DOCK",
+ [EXTCON_JIG] = "JIG",
+ [EXTCON_MECHANICAL] = "MECHANICAL",
+
+ NULL,
};
static struct class *extcon_class;
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 find_cable_index_by_name(struct extcon_dev *edev, const char *name)
+{
+ unsigned int id = EXTCON_NONE;
+ int i = 0;
+
+ if (edev->max_supported == 0)
+ return -EINVAL;
+
+ /* Find the the number of extcon cable */
+ while (extcon_name[i]) {
+ if (!strncmp(extcon_name[i], name, CABLE_NAME_MAX)) {
+ id = i;
+ break;
+ }
+ }
+
+ if (id == EXTCON_NONE)
+ return -EINVAL;
+
+ 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)) {
+ *attached = new ? true : false;
+ return true;
+ }
+
+ return false;
+}
+
static ssize_t state_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
if (edev->max_supported == 0)
return sprintf(buf, "%u\n", edev->state);
- for (i = 0; i < SUPPORTED_CABLE_MAX; i++) {
- if (!edev->supported_cable[i])
- break;
+ for (i = 0; i < edev->max_supported; i++) {
count += sprintf(buf + count, "%s=%d\n",
- edev->supported_cable[i],
+ extcon_name[edev->supported_cable[i]],
!!(edev->state & (1 << i)));
}
{
struct extcon_dev *edev = dev_get_drvdata(dev);
- /* Optional callback given by the user */
- if (edev->print_name) {
- int ret = edev->print_name(edev, buf);
-
- if (ret >= 0)
- return ret;
- }
-
- return sprintf(buf, "%s\n", dev_name(&edev->dev));
+ return sprintf(buf, "%s\n", edev->name);
}
static DEVICE_ATTR_RO(name);
{
struct extcon_cable *cable = container_of(attr, struct extcon_cable,
attr_name);
+ int i = cable->cable_index;
return sprintf(buf, "%s\n",
- cable->edev->supported_cable[cable->cable_index]);
+ extcon_name[cable->edev->supported_cable[i]]);
}
static ssize_t cable_state_show(struct device *dev,
char *envp[3];
int env_offset = 0;
int length;
+ int index;
unsigned long flags;
+ bool attached;
spin_lock_irqsave(&edev->lock, flags);
if (edev->state != ((edev->state & ~mask) | (state & mask))) {
- u32 old_state = edev->state;
-
if (check_mutually_exclusive(edev, (edev->state & ~mask) |
(state & mask))) {
spin_unlock_irqrestore(&edev->lock, flags);
return -EPERM;
}
+ for (index = 0; index < edev->max_supported; index++) {
+ if (is_extcon_changed(edev->state, state, index, &attached))
+ raw_notifier_call_chain(&edev->nh[index], attached, edev);
+ }
+
edev->state &= ~mask;
edev->state |= state & mask;
- raw_notifier_call_chain(&edev->nh, old_state, edev);
/* This could be in interrupt handler */
prop_buf = (char *)get_zeroed_page(GFP_ATOMIC);
if (prop_buf) {
EXPORT_SYMBOL_GPL(extcon_set_state);
/**
- * extcon_find_cable_index() - Get the cable index based on the cable name.
+ * extcon_get_cable_state_() - Get the status of a specific cable.
* @edev: the extcon device that has the cable.
- * @cable_name: cable name to be searched.
- *
- * Note that accessing a cable state based on cable_index is faster than
- * cable_name because using cable_name induces a loop with strncmp().
- * Thus, when get/set_cable_state is repeatedly used, using cable_index
- * is recommended.
+ * @id: the unique id of each external connector in extcon enumeration.
*/
-int extcon_find_cable_index(struct extcon_dev *edev, const char *cable_name)
+int extcon_get_cable_state_(struct extcon_dev *edev, const unsigned int id)
{
- int i;
+ int index;
- if (edev->supported_cable) {
- for (i = 0; edev->supported_cable[i]; i++) {
- if (!strncmp(edev->supported_cable[i],
- cable_name, CABLE_NAME_MAX))
- return i;
- }
- }
+ index = find_cable_index_by_id(edev, id);
+ if (index < 0)
+ return index;
- return -EINVAL;
-}
-EXPORT_SYMBOL_GPL(extcon_find_cable_index);
-
-/**
- * extcon_get_cable_state_() - Get the status of a specific cable.
- * @edev: the extcon device that has the cable.
- * @index: cable index that can be retrieved by extcon_find_cable_index().
- */
-int extcon_get_cable_state_(struct extcon_dev *edev, int index)
-{
- if (index < 0 || (edev->max_supported && edev->max_supported <= index))
+ if (edev->max_supported && edev->max_supported <= index)
return -EINVAL;
return !!(edev->state & (1 << index));
*/
int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name)
{
- return extcon_get_cable_state_(edev, extcon_find_cable_index
+ return extcon_get_cable_state_(edev, find_cable_index_by_name
(edev, cable_name));
}
EXPORT_SYMBOL_GPL(extcon_get_cable_state);
/**
* extcon_set_cable_state_() - Set the status of a specific cable.
* @edev: the extcon device that has the cable.
- * @index: cable index that can be retrieved by
- * extcon_find_cable_index().
- * @cable_state: the new cable status. The default semantics is
+ * @id: the unique id of each external connector
+ * in extcon enumeration.
+ * @state: the new cable status. The default semantics is
* true: attached / false: detached.
*/
-int extcon_set_cable_state_(struct extcon_dev *edev,
- int index, bool cable_state)
+int extcon_set_cable_state_(struct extcon_dev *edev, unsigned int id,
+ bool cable_state)
{
u32 state;
+ int index;
+
+ index = find_cable_index_by_id(edev, id);
+ if (index < 0)
+ return index;
- if (index < 0 || (edev->max_supported && edev->max_supported <= index))
+ if (edev->max_supported && edev->max_supported <= index)
return -EINVAL;
state = cable_state ? (1 << index) : 0;
int extcon_set_cable_state(struct extcon_dev *edev,
const char *cable_name, bool cable_state)
{
- return extcon_set_cable_state_(edev, extcon_find_cable_index
+ return extcon_set_cable_state_(edev, find_cable_index_by_name
(edev, cable_name), cable_state);
}
EXPORT_SYMBOL_GPL(extcon_set_cable_state);
}
EXPORT_SYMBOL_GPL(extcon_get_extcon_dev);
-static int _call_per_cable(struct notifier_block *nb, unsigned long val,
- void *ptr)
-{
- struct extcon_specific_cable_nb *obj = container_of(nb,
- struct extcon_specific_cable_nb, internal_nb);
- struct extcon_dev *edev = ptr;
-
- if ((val & (1 << obj->cable_index)) !=
- (edev->state & (1 << obj->cable_index))) {
- bool cable_state = true;
-
- obj->previous_value = val;
-
- if (val & (1 << obj->cable_index))
- cable_state = false;
-
- return obj->user_nb->notifier_call(obj->user_nb,
- cable_state, ptr);
- }
-
- return NOTIFY_OK;
-}
-
/**
* extcon_register_interest() - Register a notifier for a state change of a
* specific cable, not an entier set of cables of a
if (!obj->edev)
return -ENODEV;
- obj->cable_index = extcon_find_cable_index(obj->edev,
- cable_name);
+ 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;
- obj->internal_nb.notifier_call = _call_per_cable;
-
spin_lock_irqsave(&obj->edev->lock, flags);
- ret = raw_notifier_chain_register(&obj->edev->nh,
- &obj->internal_nb);
+ ret = raw_notifier_chain_register(
+ &obj->edev->nh[obj->cable_index],
+ obj->user_nb);
spin_unlock_irqrestore(&obj->edev->lock, flags);
- return ret;
} else {
struct class_dev_iter iter;
struct extcon_dev *extd;
while ((dev = class_dev_iter_next(&iter))) {
extd = dev_get_drvdata(dev);
- if (extcon_find_cable_index(extd, cable_name) < 0)
+ if (find_cable_index_by_name(extd, cable_name) < 0)
continue;
class_dev_iter_exit(&iter);
cable_name, nb);
}
- return -ENODEV;
+ ret = -ENODEV;
}
+
+ return ret;
}
EXPORT_SYMBOL_GPL(extcon_register_interest);
return -EINVAL;
spin_lock_irqsave(&obj->edev->lock, flags);
- ret = raw_notifier_chain_unregister(&obj->edev->nh, &obj->internal_nb);
+ ret = raw_notifier_chain_unregister(
+ &obj->edev->nh[obj->cable_index], obj->user_nb);
spin_unlock_irqrestore(&obj->edev->lock, flags);
return ret;
/**
* extcon_register_notifier() - Register a notifiee to get notified by
* any attach status changes from the extcon.
- * @edev: the 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.
*
* Note that the second parameter given to the callback of nb (val) is
* "old_state", not the current state. The current state can be retrieved
* by looking at the third pameter (edev pointer)'s state value.
*/
-int extcon_register_notifier(struct extcon_dev *edev,
- struct notifier_block *nb)
+int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
+ struct notifier_block *nb)
{
unsigned long flags;
- int ret;
+ int ret, idx;
+
+ idx = find_cable_index_by_id(edev, id);
spin_lock_irqsave(&edev->lock, flags);
- ret = raw_notifier_chain_register(&edev->nh, nb);
+ ret = raw_notifier_chain_register(&edev->nh[idx], nb);
spin_unlock_irqrestore(&edev->lock, flags);
return ret;
/**
* extcon_unregister_notifier() - Unregister a notifiee from the extcon device.
- * @edev: the extcon device.
- * @nb: a registered notifier block to be unregistered.
+ * @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.
*/
-int extcon_unregister_notifier(struct extcon_dev *edev,
- struct notifier_block *nb)
+int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
+ struct notifier_block *nb)
{
unsigned long flags;
- int ret;
+ int ret, idx;
+
+ idx = find_cable_index_by_id(edev, id);
spin_lock_irqsave(&edev->lock, flags);
- ret = raw_notifier_chain_unregister(&edev->nh, nb);
+ ret = raw_notifier_chain_unregister(&edev->nh[idx], nb);
spin_unlock_irqrestore(&edev->lock, flags);
return ret;
/*
* extcon_dev_allocate() - Allocate the memory of extcon device.
- * @supported_cable: Array of supported cable names ending with NULL.
+ * @supported_cable: Array of supported extcon ending with EXTCON_NONE.
* If supported_cable is NULL, cable name related APIs
* are disabled.
*
*
* Return the pointer of extcon device if success or ERR_PTR(err) if fail
*/
-struct extcon_dev *extcon_dev_allocate(const char **supported_cable)
+struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable)
{
struct extcon_dev *edev;
/**
* devm_extcon_dev_allocate - Allocate managed extcon device
* @dev: device owning the extcon device being created
- * @supported_cable: Array of supported cable names ending with NULL.
+ * @supported_cable: Array of supported extcon ending with EXTCON_NONE.
* If supported_cable is NULL, cable name related APIs
* are disabled.
*
* or ERR_PTR(err) if fail
*/
struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
- const char **supported_cable)
+ const unsigned int *supported_cable)
{
struct extcon_dev **ptr, *edev;
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();
return ret;
}
- if (edev->supported_cable) {
- /* Get size of array */
- for (index = 0; edev->supported_cable[index]; index++)
- ;
- edev->max_supported = index;
- } else {
- edev->max_supported = 0;
- }
+ if (!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, "extcon: maximum number of supported cables exceeded.\n");
+ 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 = edev->name ? edev->name : dev_name(edev->dev.parent);
+ 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, "%s", edev->name);
+ dev_set_name(&edev->dev, "extcon%lu",
+ (unsigned long)atomic_inc_return(&edev_no));
if (edev->max_supported) {
char buf[10];
spin_lock_init(&edev->lock);
- RAW_INIT_NOTIFIER_HEAD(&edev->nh);
+ edev->nh = devm_kzalloc(&edev->dev,
+ sizeof(*edev->nh) * edev->max_supported, 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]);
dev_set_drvdata(&edev->dev, edev);
edev->state = 0;
#endif /* CONFIG_OF */
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_exit(extcon_class_exit);
+MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>");
MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
projects / deliverable / linux.git / blobdiff