linux/drivers/extcon/extcon-class.c
Wang, Xiaoming 7585ca0dc9 extcon: remove freed groups caused the panic or warning in unregister flow
(edev->extcon_dev_type.groups) has been freed before device_unregister.
extcon_dev_unregister -> kfree(edev->extcon_dev_type.groups)
then device_unregister -> device_del -> device_remove_attrs
-> device_remove_groups(dev, type->groups);
panic because type->groups has been freed.

This patch is move device_unregister ahead of groups free
to avoid panic in extcon_dev_unregister.

stack
[ 22.847226] BUG: unable to handle kernel paging request at 5f39746e
[ 22.847234] IP: [<c1387fcd>] sysfs_remove_group+0x2d/0xd0
[ 22.847238] *pdpt = 0000000000000000 *pde = 0000000000000000
[ 22.847241] Oops: 0000 [#1] PREEMPT SMP
[ 22.847244] Modules linked in:
[ 22.847249] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 3.10.16-261140-g6533774 #1
[ 22.847251] task: f3078000 ti: f3072000 task.ti: f3072000
[ 22.847254] EIP: 0060:[<c1387fcd>] EFLAGS: 00010206 CPU: 0
[ 22.847257] EIP is at sysfs_remove_group+0x2d/0xd0
[ 22.847259] EAX: 00000004 EBX: 5f39746e ECX: 00000000 EDX: f2773560
[ 22.847261] ESI: f2653b80 EDI: f2773560 EBP: f3073c90 ESP: f3073c70
[ 22.847263] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
[ 22.847264] CR0: 8005003b CR2: 5f39746e CR3: 020e5000 CR4: 001007f0
[ 22.847266] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[ 22.847268] DR6: ffff0ff0 DR7: 00000400
[ 22.847269] Stack:
[ 22.847276] c13848c9 c1ae3805 f3073c80 f24ddc4c 00000246 f2773e88 f1c44408 f2531340
[ 22.847283] f3073ca0 c16935ca f1c44400 f27d3340 f3073cb4 c1693858 f24ddc44 f1c44400
[ 22.847289] f1c4420c f3073cc8 c1693f76 f1c44400 00000001 00000000 f3073ce8 c1694011
[ 22.847290] Call Trace:
[ 22.847295] [<c13848c9>] ? sysfs_hash_and_remove+0x49/0xa0
[ 22.847300] [<c1ae3805>] ? sub_preempt_count+0x55/0xe0
[ 22.847306] [<c16935ca>] device_remove_groups+0x2a/0x40
[ 22.847309] [<c1693858>] device_remove_attrs+0x38/0x60
[ 22.847313] [<c1693f76>] device_del+0xd6/0x150
[ 22.847316] [<c1694011>] device_unregister+0x21/0x60
[ 22.847320] [<c13869e8>] ? sysfs_remove_link+0x18/0x30
[ 22.847323] [<c1697d04>] ? class_compat_remove_link+0x34/0x50
[ 22.847329] [<c18bf5d9>] extcon_dev_unregister+0xf9/0x130
[ 22.847333] [<c18bd21f>] pwrsrc_extcon_dev_reg_callback+0x7f/0xa0
[ 22.847337] [<c1ae36e3>] notifier_call_chain+0x43/0x60
[ 22.847343] [<c12634e1>] __blocking_notifier_call_chain+0x41/0x80
[ 22.847347] [<c126353f>] blocking_notifier_call_chain+0x1f/0x30
[ 22.847351] [<c18bef39>] extcon_dev_notify_add_device+0x19/0x20
[ 22.847354] [<c18bf074>] extcon_dev_register+0x134/0x580
[ 22.847358] [<c1ae3805>] ? sub_preempt_count+0x55/0xe0
[ 22.847363] [<c154b4da>] ? gpiod_request+0x6a/0x1d0
[ 22.847368] [<c132528a>] ? kmem_cache_alloc_trace+0xaa/0x170
[ 22.847372] [<c18c0179>] ? fsa9285_probe+0x99/0x3f0
[ 22.847375] [<c18c00e0>] ? fsa9285_irq_handler+0xf0/0xf0
[ 22.847379] [<c18c019f>] fsa9285_probe+0xbf/0x3f0
[ 22.847383] [<c18c00e0>] ? fsa9285_irq_handler+0xf0/0xf0
[ 22.847388] [<c1828d9e>] i2c_device_probe+0x7e/0xf0
[ 22.847392] [<c1386e52>] ? sysfs_create_link+0x22/0x40
[ 22.847395] [<c1696c62>] ? driver_sysfs_add+0x72/0xa0
[ 22.847399] [<c1697119>] driver_probe_device+0x79/0x360
[ 22.847403] [<c1697491>] __driver_attach+0x91/0xa0
[ 22.847407] [<c1697400>] ? driver_probe_device+0x360/0x360
[ 22.847410] [<c16955a2>] bus_for_each_dev+0x42/0x80
[ 22.847414] [<c1696bee>] driver_attach+0x1e/0x20
[ 22.847417] [<c1697400>] ? driver_probe_device+0x360/0x360
[ 22.847420] [<c169675f>] bus_add_driver+0xef/0x270
[ 22.847425] [<c1828e10>] ? i2c_device_probe+0xf0/0xf0
[ 22.847428] [<c1828e10>] ? i2c_device_probe+0xf0/0xf0
[ 22.847432] [<c1697a8a>] driver_register+0x6a/0x160
[ 22.847436] [<c1addb3d>] ? mutex_unlock+0xd/0x10
[ 22.847440] [<c1438ab2>] ? __create_file+0x122/0x2a0
[ 22.847446] [<c20557d3>] ? extcon_class_init+0x15/0x15
[ 22.847450] [<c1827cbb>] i2c_register_driver+0x2b/0xd0
[ 22.847454] [<c1438d05>] ? debugfs_create_file+0x35/0x40
[ 22.847458] [<c20557d3>] ? extcon_class_init+0x15/0x15
[ 22.847461] [<c20557e4>] fsa9285_extcon_init+0x11/0x29
[ 22.847465] [<c12001aa>] do_one_initcall+0xba/0x170
[ 22.847471] [<c2012b4a>] kernel_init_freeable+0x119/0x1b8
[ 22.847475] [<c20124d3>] ? do_early_param+0x7a/0x7a
[ 22.847480] [<c1ac4090>] kernel_init+0x10/0xd0
[ 22.847485] [<c1ae6cf7>] ret_from_kernel_thread+0x1b/0x28
[ 22.847488] [<c1ac4080>] ? rest_init+0x80/0x80

Tested-by: Liu, Chuansheng <chuansheng.liu@intel.com>
Reviewed-by: Liu, Chuansheng <chuansheng.liu@intel.com>
Signed-off-by: xiaoming wang <xiaoming.wang@intel.com>
Signed-off-by: Zhang Dongxing <dongxing.zhang@intel.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2013-11-26 15:17:23 +09:00

841 lines
23 KiB
C

/*
* drivers/extcon/extcon_class.c
*
* External connector (extcon) class driver
*
* 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/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] = {
[EXTCON_USB] = "USB",
[EXTCON_USB_HOST] = "USB-Host",
[EXTCON_TA] = "TA",
[EXTCON_FAST_CHARGER] = "Fast-charger",
[EXTCON_SLOW_CHARGER] = "Slow-charger",
[EXTCON_CHARGE_DOWNSTREAM] = "Charge-downstream",
[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",
};
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 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->print_state) {
int ret = edev->print_state(edev, buf);
if (ret >= 0)
return ret;
/* Use default if failed */
}
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;
count += sprintf(buf + count, "%s=%d\n",
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);
/* 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));
}
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);
return sprintf(buf, "%s\n",
cable->edev->supported_cable[cable->cable_index]);
}
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);
return sprintf(buf, "%d\n",
extcon_get_cable_state_(cable->edev,
cable->cable_index));
}
/**
* 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;
unsigned long flags;
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;
}
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) {
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)
{
return extcon_update_state(edev, 0xffffffff, state);
}
EXPORT_SYMBOL_GPL(extcon_set_state);
/**
* extcon_find_cable_index() - Get the cable index based on the cable name.
* @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.
*/
int extcon_find_cable_index(struct extcon_dev *edev, const char *cable_name)
{
int i;
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;
}
}
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))
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)
{
return extcon_get_cable_state_(edev, extcon_find_cable_index
(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
* true: attached / false: detached.
*/
int extcon_set_cable_state_(struct extcon_dev *edev,
int index, bool cable_state)
{
u32 state;
if (index < 0 || (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)
{
return extcon_set_cable_state_(edev, extcon_find_cable_index
(edev, cable_name), 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;
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);
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
* 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)
{
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 = extcon_find_cable_index(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;
return raw_notifier_chain_register(&obj->edev->nh,
&obj->internal_nb);
} 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 (extcon_find_cable_index(extd, cable_name) < 0)
continue;
class_dev_iter_exit(&iter);
return extcon_register_interest(obj, extd->name,
cable_name, nb);
}
return -ENODEV;
}
}
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)
{
if (!obj)
return -EINVAL;
return raw_notifier_chain_unregister(&obj->edev->nh, &obj->internal_nb);
}
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.
* @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)
{
return raw_notifier_chain_register(&edev->nh, nb);
}
EXPORT_SYMBOL_GPL(extcon_register_notifier);
/**
* extcon_unregister_notifier() - Unregister a notifiee from the extcon device.
* @edev: the extcon device.
* @nb: a registered notifier block to be unregistered.
*/
int extcon_unregister_notifier(struct extcon_dev *edev,
struct notifier_block *nb)
{
return raw_notifier_chain_unregister(&edev->nh, nb);
}
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_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;
if (!extcon_class) {
ret = create_extcon_class();
if (ret < 0)
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 (index > SUPPORTED_CABLE_MAX) {
dev_err(&edev->dev, "extcon: maximum number of supported cables exceeded.\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);
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);
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);
RAW_INIT_NOTIFIER_HEAD(&edev->nh);
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;
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 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("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");