linux/drivers/extcon/extcon.c
Chanwoo Choi 11eecf910b extcon: Modify the id and name of external connector
This patch modifies the id and name of external connector with the
additional prefix to clarify both attribute and meaning of external
connector as following:
- EXTCON_CHG_* mean the charger connector.
- EXTCON_JACK_* mean the jack connector.
- EXTCON_DISP_* mean the display port connector.

Following table show the new name of external connector with old name:
--------------------------------------------------
Old extcon name         | New extcon name        |
--------------------------------------------------
EXTCON_TA               | EXTCON_CHG_USB_DCP     |
EXTCON_CHARGE_DOWNSTREAM| EXTCON_CHG_USB_CDP     |
EXTCON_FAST_CHARGER     | EXTCON_CHG_USB_FAST    |
EXTCON_SLOW_CHARGER     | EXTCON_CHG_USB_SLOW    |
--------------------------------------------------
EXTCON_MICROPHONE       | EXTCON_JACK_MICROPHONE |
EXTCON_HEADPHONE        | EXTCON_JACK_HEADPHONE  |
EXTCON_LINE_IN          | EXTCON_JACK_LINE_IN    |
EXTCON_LINE_OUT         | EXTCON_JACK_LINE_OUT   |
EXTCON_VIDEO_IN         | EXTCON_JACK_VIDEO_IN   |
EXTCON_VIDEO_OUT        | EXTCON_JACK_VIDEO_OUT  |
EXTCON_SPDIF_IN         | EXTCON_JACK_SPDIF_IN   |
EXTCON_SPDIF_OUT        | EXTCON_JACK_SPDIF_OUT  |
--------------------------------------------------
EXTCON_HMDI             | EXTCON_DISP_HDMI       |
EXTCON_MHL              | EXTCON_DISP_MHL        |
EXTCON_DVI              | EXTCON_DISP_DVI        |
EXTCON_VGA              | EXTCON_DISP_VGA        |
--------------------------------------------------

And, when altering the name of USB charger connector, EXTCON refers to the
"Battery Charging v1.2 Spec and Adopters Agreement"[1] to use the standard
name of USB charging port as following. Following name of USB charging port
are already used in power_supply subsystem. We chan check it on patch[2].
- EXTCON_CHG_USB_SDP	/* Standard Downstream Port */
- EXTCON_CHG_USB_DCP	/* Dedicated Charging Port */
- EXTCON_CHG_USB_CDP	/* Charging Downstream Port */
- EXTCON_CHG_USB_ACA	/* Accessory Charger Adapter */

[1] www.usb.org/developers/docs/devclass_docs/BCv1.2_070312.zip
[2] commit 85efc8a18c ("power_supply: Add types for USB chargers")

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
[ckeepax: For the Arizona changes]
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Reviewed-by: Roger Quadros <rogerq@ti.com>
2015-10-16 08:30:09 +09:00

1155 lines
30 KiB
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>
*
* based on android/drivers/switch/switch_class.c
* Copyright (C) 2008 Google, Inc.
* Author: Mike Lockwood <lockwood@android.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/err.h>
#include <linux/extcon.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#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",
/* Charging external connector */
[EXTCON_CHG_USB_SDP] = "SDP",
[EXTCON_CHG_USB_DCP] = "DCP",
[EXTCON_CHG_USB_CDP] = "CDP",
[EXTCON_CHG_USB_ACA] = "ACA",
[EXTCON_CHG_USB_FAST] = "FAST-CHARGER",
[EXTCON_CHG_USB_SLOW] = "SLOW-CHARGER",
/* Jack external connector */
[EXTCON_JACK_MICROPHONE] = "MICROPHONE",
[EXTCON_JACK_HEADPHONE] = "HEADPHONE",
[EXTCON_JACK_LINE_IN] = "LINE-IN",
[EXTCON_JACK_LINE_OUT] = "LINE-OUT",
[EXTCON_JACK_VIDEO_IN] = "VIDEO-IN",
[EXTCON_JACK_VIDEO_OUT] = "VIDEO-OUT",
[EXTCON_JACK_SPDIF_IN] = "SPDIF-IN",
[EXTCON_JACK_SPDIF_OUT] = "SPDIF-OUT",
/* Display external connector */
[EXTCON_DISP_HDMI] = "HDMI",
[EXTCON_DISP_MHL] = "MHL",
[EXTCON_DISP_DVI] = "DVI",
[EXTCON_DISP_VGA] = "VGA",
/* Miscellaneous external connector */
[EXTCON_DOCK] = "DOCK",
[EXTCON_JIG] = "JIG",
[EXTCON_MECHANICAL] = "MECHANICAL",
NULL,
};
static struct class *extcon_class;
#if defined(CONFIG_ANDROID)
static struct class_compat *switch_class;
#endif /* CONFIG_ANDROID */
static LIST_HEAD(extcon_dev_list);
static DEFINE_MUTEX(extcon_dev_list_lock);
/**
* check_mutually_exclusive - Check if new_state violates mutually_exclusive
* condition.
* @edev: the extcon device
* @new_state: new cable attach status for @edev
*
* Returns 0 if nothing violates. Returns the index + 1 for the first
* violated condition.
*/
static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state)
{
int i = 0;
if (!edev->mutually_exclusive)
return 0;
for (i = 0; edev->mutually_exclusive[i]; i++) {
int weight;
u32 correspondants = new_state & edev->mutually_exclusive[i];
/* calculate the total number of bits set */
weight = hweight32(correspondants);
if (weight > 1)
return i + 1;
}
return 0;
}
static 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_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)) {
*attached = ((new >> idx) & 0x1) ? true : false;
return true;
}
return false;
}
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_name[edev->supported_cable[i]],
!!(edev->state & (1 << i)));
}
return count;
}
static ssize_t state_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
u32 state;
ssize_t ret = 0;
struct extcon_dev *edev = dev_get_drvdata(dev);
ret = sscanf(buf, "0x%x", &state);
if (ret == 0)
ret = -EINVAL;
else
ret = extcon_set_state(edev, state);
if (ret < 0)
return ret;
return count;
}
static DEVICE_ATTR_RW(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_name[cable->edev->supported_cable[i]]);
}
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_cable_state_(cable->edev,
cable->edev->supported_cable[i]));
}
/**
* extcon_update_state() - Update the cable attach states of the extcon device
* only for the masked bits.
* @edev: the extcon device
* @mask: the bit mask to designate updated bits.
* @state: new cable attach status for @edev
*
* Changing the state sends uevent with environment variable containing
* the name of extcon device (envp[0]) and the state output (envp[1]).
* Tizen uses this format for extcon device to get events from ports.
* Android uses this format as well.
*
* Note that the notifier provides which bits are changed in the state
* variable with the val parameter (second) to the callback.
*/
int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state)
{
char name_buf[120];
char state_buf[120];
char *prop_buf;
char *envp[3];
int env_offset = 0;
int length;
int index;
unsigned long flags;
bool attached;
if (!edev)
return -EINVAL;
spin_lock_irqsave(&edev->lock, flags);
if (edev->state != ((edev->state & ~mask) | (state & mask))) {
u32 old_state;
if (check_mutually_exclusive(edev, (edev->state & ~mask) |
(state & mask))) {
spin_unlock_irqrestore(&edev->lock, flags);
return -EPERM;
}
old_state = edev->state;
edev->state &= ~mask;
edev->state |= state & mask;
for (index = 0; index < edev->max_supported; index++) {
if (is_extcon_changed(old_state, edev->state, index,
&attached))
raw_notifier_call_chain(&edev->nh[index],
attached, edev);
}
/* This could be in interrupt handler */
prop_buf = (char *)get_zeroed_page(GFP_ATOMIC);
if (prop_buf) {
length = name_show(&edev->dev, NULL, prop_buf);
if (length > 0) {
if (prop_buf[length - 1] == '\n')
prop_buf[length - 1] = 0;
snprintf(name_buf, sizeof(name_buf),
"NAME=%s", prop_buf);
envp[env_offset++] = name_buf;
}
length = state_show(&edev->dev, NULL, prop_buf);
if (length > 0) {
if (prop_buf[length - 1] == '\n')
prop_buf[length - 1] = 0;
snprintf(state_buf, sizeof(state_buf),
"STATE=%s", prop_buf);
envp[env_offset++] = state_buf;
}
envp[env_offset] = NULL;
/* Unlock early before uevent */
spin_unlock_irqrestore(&edev->lock, flags);
kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp);
free_page((unsigned long)prop_buf);
} else {
/* Unlock early before uevent */
spin_unlock_irqrestore(&edev->lock, flags);
dev_err(&edev->dev, "out of memory in extcon_set_state\n");
kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE);
}
} else {
/* No changes */
spin_unlock_irqrestore(&edev->lock, flags);
}
return 0;
}
EXPORT_SYMBOL_GPL(extcon_update_state);
/**
* extcon_set_state() - Set the cable attach states of the extcon device.
* @edev: the extcon device
* @state: new cable attach status for @edev
*
* Note that notifier provides which bits are changed in the state
* variable with the val parameter (second) to the callback.
*/
int extcon_set_state(struct extcon_dev *edev, u32 state)
{
if (!edev)
return -EINVAL;
return extcon_update_state(edev, 0xffffffff, state);
}
EXPORT_SYMBOL_GPL(extcon_set_state);
/**
* extcon_get_cable_state_() - Get the status of a specific cable.
* @edev: the extcon device that has the cable.
* @id: the unique id of each external connector in extcon enumeration.
*/
int extcon_get_cable_state_(struct extcon_dev *edev, const unsigned int id)
{
int index;
if (!edev)
return -EINVAL;
index = find_cable_index_by_id(edev, id);
if (index < 0)
return index;
if (edev->max_supported && edev->max_supported <= index)
return -EINVAL;
return !!(edev->state & (1 << index));
}
EXPORT_SYMBOL_GPL(extcon_get_cable_state_);
/**
* extcon_get_cable_state() - Get the status of a specific cable.
* @edev: the extcon device that has the cable.
* @cable_name: cable name.
*
* Note that this is slower than extcon_get_cable_state_.
*/
int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name)
{
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
* 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, unsigned int id,
bool cable_state)
{
u32 state;
int index;
if (!edev)
return -EINVAL;
index = find_cable_index_by_id(edev, id);
if (index < 0)
return index;
if (edev->max_supported && edev->max_supported <= index)
return -EINVAL;
state = cable_state ? (1 << index) : 0;
return extcon_update_state(edev, 1 << index, state);
}
EXPORT_SYMBOL_GPL(extcon_set_cable_state_);
/**
* extcon_set_cable_state() - Set the status of a specific cable.
* @edev: the extcon device that has the cable.
* @cable_name: cable name.
* @cable_state: the new cable status. The default semantics is
* true: attached / false: detached.
*
* Note that this is slower than extcon_set_cable_state_.
*/
int extcon_set_cable_state(struct extcon_dev *edev,
const char *cable_name, bool cable_state)
{
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()
*/
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_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.
* @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, 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);
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 notifiee from 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.
*/
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);
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);
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;
#if defined(CONFIG_ANDROID)
switch_class = class_compat_register("switch");
if (WARN(!switch_class, "cannot allocate"))
return -ENOMEM;
#endif /* CONFIG_ANDROID */
}
return 0;
}
static void extcon_dev_release(struct device *dev)
{
}
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: Array of supported extcon ending with EXTCON_NONE.
* If supported_cable is NULL, cable name related APIs
* are disabled.
*
* This function allocates the memory for extcon device without allocating
* memory in each extcon provider driver and initialize default setting for
* extcon device.
*
* Return the pointer of extcon device 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 to free
*/
void extcon_dev_free(struct extcon_dev *edev)
{
kfree(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);
/**
* extcon_dev_register() - Register a new extcon device
* @edev : the new extcon device (should be allocated before calling)
*
* Among the members of edev struct, please set the "user initializing data"
* in any case and set the "optional callbacks" if required. However, please
* do not set the values of "internal data", which are initialized by
* this function.
*/
int extcon_dev_register(struct extcon_dev *edev)
{
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 = kzalloc(sizeof(struct extcon_cable) *
edev->max_supported, GFP_KERNEL);
if (!edev->cables) {
ret = -ENOMEM;
goto err_sysfs_alloc;
}
for (index = 0; index < edev->max_supported; index++) {
cable = &edev->cables[index];
snprintf(buf, 10, "cable.%d", index);
str = kzalloc(sizeof(char) * (strlen(buf) + 1),
GFP_KERNEL);
if (!str) {
for (index--; index >= 0; index--) {
cable = &edev->cables[index];
kfree(cable->attr_g.name);
}
ret = -ENOMEM;
goto err_alloc_cables;
}
strcpy(str, buf);
cable->edev = edev;
cable->cable_index = index;
cable->attrs[0] = &cable->attr_name.attr;
cable->attrs[1] = &cable->attr_state.attr;
cable->attrs[2] = NULL;
cable->attr_g.name = str;
cable->attr_g.attrs = cable->attrs;
sysfs_attr_init(&cable->attr_name.attr);
cable->attr_name.attr.name = "name";
cable->attr_name.attr.mode = 0444;
cable->attr_name.show = cable_name_show;
sysfs_attr_init(&cable->attr_state.attr);
cable->attr_state.attr.name = "state";
cable->attr_state.attr.mode = 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 = kzalloc(sizeof(struct attribute *) *
(index + 1), GFP_KERNEL);
if (!edev->attrs_muex) {
ret = -ENOMEM;
goto err_muex;
}
edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) *
index, GFP_KERNEL);
if (!edev->d_attrs_muex) {
ret = -ENOMEM;
kfree(edev->attrs_muex);
goto err_muex;
}
for (index = 0; edev->mutually_exclusive[index]; index++) {
sprintf(buf, "0x%x", edev->mutually_exclusive[index]);
name = kzalloc(sizeof(char) * (strlen(buf) + 1),
GFP_KERNEL);
if (!name) {
for (index--; index >= 0; index--) {
kfree(edev->d_attrs_muex[index].attr.
name);
}
kfree(edev->d_attrs_muex);
kfree(edev->attrs_muex);
ret = -ENOMEM;
goto err_muex;
}
strcpy(name, buf);
sysfs_attr_init(&edev->d_attrs_muex[index].attr);
edev->d_attrs_muex[index].attr.name = name;
edev->d_attrs_muex[index].attr.mode = 0000;
edev->attrs_muex[index] = &edev->d_attrs_muex[index]
.attr;
}
edev->attr_g_muex.name = muex_name;
edev->attr_g_muex.attrs = edev->attrs_muex;
}
if (edev->max_supported) {
edev->extcon_dev_type.groups =
kzalloc(sizeof(struct attribute_group *) *
(edev->max_supported + 2), GFP_KERNEL);
if (!edev->extcon_dev_type.groups) {
ret = -ENOMEM;
goto err_alloc_groups;
}
edev->extcon_dev_type.name = dev_name(&edev->dev);
edev->extcon_dev_type.release = dummy_sysfs_dev_release;
for (index = 0; index < edev->max_supported; index++)
edev->extcon_dev_type.groups[index] =
&edev->cables[index].attr_g;
if (edev->mutually_exclusive)
edev->extcon_dev_type.groups[index] =
&edev->attr_g_muex;
edev->dev.type = &edev->extcon_dev_type;
}
ret = device_register(&edev->dev);
if (ret) {
put_device(&edev->dev);
goto err_dev;
}
#if defined(CONFIG_ANDROID)
if (switch_class)
ret = class_compat_create_link(switch_class, &edev->dev, NULL);
#endif /* CONFIG_ANDROID */
spin_lock_init(&edev->lock);
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;
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 instance to be unregistered.
*
* Note that this does not call kfree(edev) because edev was not allocated
* by this class.
*/
void extcon_dev_unregister(struct extcon_dev *edev)
{
int index;
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);
}
#if defined(CONFIG_ANDROID)
if (switch_class)
class_compat_remove_link(switch_class, &edev->dev, NULL);
#endif
put_device(&edev->dev);
}
EXPORT_SYMBOL_GPL(extcon_dev_unregister);
static void devm_extcon_dev_unreg(struct device *dev, void *res)
{
extcon_dev_unregister(*(struct extcon_dev **)res);
}
/**
* 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);
#ifdef CONFIG_OF
/*
* extcon_get_edev_by_phandle - Get the extcon device from devicetree
* @dev - instance to the given device
* @index - index into list of extcon_dev
*
* return the instance of extcon device
*/
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_err(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_err(dev, "failed to get phandle in %s node\n",
dev->of_node->full_name);
return ERR_PTR(-ENODEV);
}
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) {
mutex_unlock(&extcon_dev_list_lock);
return edev;
}
}
mutex_unlock(&extcon_dev_list_lock);
return ERR_PTR(-EPROBE_DEFER);
}
#else
struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
{
return ERR_PTR(-ENOSYS);
}
#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_init(extcon_class_init);
static void __exit extcon_class_exit(void)
{
#if defined(CONFIG_ANDROID)
class_compat_unregister(switch_class);
#endif
class_destroy(extcon_class);
}
module_exit(extcon_class_exit);
MODULE_AUTHOR("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>");
MODULE_DESCRIPTION("External connector (extcon) class driver");
MODULE_LICENSE("GPL");