![Hans de Goede](/assets/img/avatar_default.png)
Since extcon.c is using raw_notifiers it must protect the notifier list itself when [un]registering notifiers to avoid the list changing while extcon_update_state is walking the list (through raw_notifier_call_chain). Signed-off-by: Hans de Goede <hdegoede@redhat.com> [cw00.choi: Apply this patch to extcon.c driver instead of old extcon-class.c] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
1067 lines
28 KiB
C
1067 lines
28 KiB
C
/*
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* drivers/extcon/extcon_class.c
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*
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* External connector (extcon) class driver
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*
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* Copyright (C) 2012 Samsung Electronics
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* Author: Donggeun Kim <dg77.kim@samsung.com>
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* Author: MyungJoo Ham <myungjoo.ham@samsung.com>
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*
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* based on android/drivers/switch/switch_class.c
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* Copyright (C) 2008 Google, Inc.
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* Author: Mike Lockwood <lockwood@android.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/err.h>
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#include <linux/extcon.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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/*
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* extcon_cable_name suggests the standard cable names for commonly used
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* cable types.
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*
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* However, please do not use extcon_cable_name directly for extcon_dev
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* struct's supported_cable pointer unless your device really supports
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* every single port-type of the following cable names. Please choose cable
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* names that are actually used in your extcon device.
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*/
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const char extcon_cable_name[][CABLE_NAME_MAX + 1] = {
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[EXTCON_USB] = "USB",
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[EXTCON_USB_HOST] = "USB-Host",
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[EXTCON_TA] = "TA",
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[EXTCON_FAST_CHARGER] = "Fast-charger",
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[EXTCON_SLOW_CHARGER] = "Slow-charger",
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[EXTCON_CHARGE_DOWNSTREAM] = "Charge-downstream",
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[EXTCON_HDMI] = "HDMI",
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[EXTCON_MHL] = "MHL",
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[EXTCON_DVI] = "DVI",
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[EXTCON_VGA] = "VGA",
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[EXTCON_DOCK] = "Dock",
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[EXTCON_LINE_IN] = "Line-in",
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[EXTCON_LINE_OUT] = "Line-out",
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[EXTCON_MIC_IN] = "Microphone",
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[EXTCON_HEADPHONE_OUT] = "Headphone",
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[EXTCON_SPDIF_IN] = "SPDIF-in",
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[EXTCON_SPDIF_OUT] = "SPDIF-out",
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[EXTCON_VIDEO_IN] = "Video-in",
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[EXTCON_VIDEO_OUT] = "Video-out",
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[EXTCON_MECHANICAL] = "Mechanical",
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};
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static struct class *extcon_class;
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#if defined(CONFIG_ANDROID)
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static struct class_compat *switch_class;
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#endif /* CONFIG_ANDROID */
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static LIST_HEAD(extcon_dev_list);
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static DEFINE_MUTEX(extcon_dev_list_lock);
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/**
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* check_mutually_exclusive - Check if new_state violates mutually_exclusive
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* condition.
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* @edev: the extcon device
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* @new_state: new cable attach status for @edev
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*
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* Returns 0 if nothing violates. Returns the index + 1 for the first
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* violated condition.
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*/
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static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state)
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{
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int i = 0;
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if (!edev->mutually_exclusive)
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return 0;
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for (i = 0; edev->mutually_exclusive[i]; i++) {
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int weight;
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u32 correspondants = new_state & edev->mutually_exclusive[i];
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/* calculate the total number of bits set */
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weight = hweight32(correspondants);
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if (weight > 1)
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return i + 1;
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}
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return 0;
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}
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static ssize_t state_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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int i, count = 0;
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struct extcon_dev *edev = dev_get_drvdata(dev);
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if (edev->print_state) {
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int ret = edev->print_state(edev, buf);
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if (ret >= 0)
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return ret;
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/* Use default if failed */
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}
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if (edev->max_supported == 0)
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return sprintf(buf, "%u\n", edev->state);
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for (i = 0; i < SUPPORTED_CABLE_MAX; i++) {
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if (!edev->supported_cable[i])
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break;
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count += sprintf(buf + count, "%s=%d\n",
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edev->supported_cable[i],
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!!(edev->state & (1 << i)));
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}
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return count;
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}
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static ssize_t state_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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u32 state;
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ssize_t ret = 0;
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struct extcon_dev *edev = dev_get_drvdata(dev);
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ret = sscanf(buf, "0x%x", &state);
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if (ret == 0)
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ret = -EINVAL;
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else
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ret = extcon_set_state(edev, state);
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if (ret < 0)
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return ret;
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return count;
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}
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static DEVICE_ATTR_RW(state);
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static ssize_t name_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct extcon_dev *edev = dev_get_drvdata(dev);
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/* Optional callback given by the user */
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if (edev->print_name) {
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int ret = edev->print_name(edev, buf);
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if (ret >= 0)
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return ret;
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}
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return sprintf(buf, "%s\n", dev_name(&edev->dev));
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}
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static DEVICE_ATTR_RO(name);
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static ssize_t cable_name_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct extcon_cable *cable = container_of(attr, struct extcon_cable,
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attr_name);
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return sprintf(buf, "%s\n",
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cable->edev->supported_cable[cable->cable_index]);
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}
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static ssize_t cable_state_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct extcon_cable *cable = container_of(attr, struct extcon_cable,
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attr_state);
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return sprintf(buf, "%d\n",
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extcon_get_cable_state_(cable->edev,
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cable->cable_index));
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}
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/**
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* extcon_update_state() - Update the cable attach states of the extcon device
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* only for the masked bits.
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* @edev: the extcon device
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* @mask: the bit mask to designate updated bits.
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* @state: new cable attach status for @edev
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*
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* Changing the state sends uevent with environment variable containing
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* the name of extcon device (envp[0]) and the state output (envp[1]).
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* Tizen uses this format for extcon device to get events from ports.
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* Android uses this format as well.
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*
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* Note that the notifier provides which bits are changed in the state
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* variable with the val parameter (second) to the callback.
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*/
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int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state)
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{
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char name_buf[120];
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char state_buf[120];
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char *prop_buf;
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char *envp[3];
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int env_offset = 0;
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int length;
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unsigned long flags;
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spin_lock_irqsave(&edev->lock, flags);
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if (edev->state != ((edev->state & ~mask) | (state & mask))) {
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u32 old_state = edev->state;
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if (check_mutually_exclusive(edev, (edev->state & ~mask) |
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(state & mask))) {
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spin_unlock_irqrestore(&edev->lock, flags);
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return -EPERM;
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}
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edev->state &= ~mask;
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edev->state |= state & mask;
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raw_notifier_call_chain(&edev->nh, old_state, edev);
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/* This could be in interrupt handler */
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prop_buf = (char *)get_zeroed_page(GFP_ATOMIC);
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if (prop_buf) {
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length = name_show(&edev->dev, NULL, prop_buf);
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if (length > 0) {
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if (prop_buf[length - 1] == '\n')
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prop_buf[length - 1] = 0;
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snprintf(name_buf, sizeof(name_buf),
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"NAME=%s", prop_buf);
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envp[env_offset++] = name_buf;
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}
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length = state_show(&edev->dev, NULL, prop_buf);
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if (length > 0) {
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if (prop_buf[length - 1] == '\n')
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prop_buf[length - 1] = 0;
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snprintf(state_buf, sizeof(state_buf),
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"STATE=%s", prop_buf);
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envp[env_offset++] = state_buf;
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}
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envp[env_offset] = NULL;
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/* Unlock early before uevent */
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spin_unlock_irqrestore(&edev->lock, flags);
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kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp);
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free_page((unsigned long)prop_buf);
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} else {
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/* Unlock early before uevent */
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spin_unlock_irqrestore(&edev->lock, flags);
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dev_err(&edev->dev, "out of memory in extcon_set_state\n");
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kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE);
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}
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} else {
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/* No changes */
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spin_unlock_irqrestore(&edev->lock, flags);
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(extcon_update_state);
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/**
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* extcon_set_state() - Set the cable attach states of the extcon device.
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* @edev: the extcon device
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* @state: new cable attach status for @edev
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*
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* Note that notifier provides which bits are changed in the state
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* variable with the val parameter (second) to the callback.
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*/
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int extcon_set_state(struct extcon_dev *edev, u32 state)
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{
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return extcon_update_state(edev, 0xffffffff, state);
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}
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EXPORT_SYMBOL_GPL(extcon_set_state);
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/**
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* extcon_find_cable_index() - Get the cable index based on the cable name.
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* @edev: the extcon device that has the cable.
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* @cable_name: cable name to be searched.
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*
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* Note that accessing a cable state based on cable_index is faster than
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* cable_name because using cable_name induces a loop with strncmp().
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* Thus, when get/set_cable_state is repeatedly used, using cable_index
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* is recommended.
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*/
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int extcon_find_cable_index(struct extcon_dev *edev, const char *cable_name)
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{
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int i;
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if (edev->supported_cable) {
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for (i = 0; edev->supported_cable[i]; i++) {
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if (!strncmp(edev->supported_cable[i],
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cable_name, CABLE_NAME_MAX))
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return i;
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}
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}
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return -EINVAL;
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}
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EXPORT_SYMBOL_GPL(extcon_find_cable_index);
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/**
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* extcon_get_cable_state_() - Get the status of a specific cable.
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* @edev: the extcon device that has the cable.
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* @index: cable index that can be retrieved by extcon_find_cable_index().
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*/
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int extcon_get_cable_state_(struct extcon_dev *edev, int index)
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{
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if (index < 0 || (edev->max_supported && edev->max_supported <= index))
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return -EINVAL;
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return !!(edev->state & (1 << index));
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}
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EXPORT_SYMBOL_GPL(extcon_get_cable_state_);
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/**
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* extcon_get_cable_state() - Get the status of a specific cable.
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* @edev: the extcon device that has the cable.
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* @cable_name: cable name.
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*
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* Note that this is slower than extcon_get_cable_state_.
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*/
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int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name)
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{
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return extcon_get_cable_state_(edev, extcon_find_cable_index
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(edev, cable_name));
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}
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EXPORT_SYMBOL_GPL(extcon_get_cable_state);
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/**
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* extcon_set_cable_state_() - Set the status of a specific cable.
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* @edev: the extcon device that has the cable.
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* @index: cable index that can be retrieved by
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* extcon_find_cable_index().
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* @cable_state: the new cable status. The default semantics is
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* true: attached / false: detached.
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*/
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int extcon_set_cable_state_(struct extcon_dev *edev,
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int index, bool cable_state)
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{
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u32 state;
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if (index < 0 || (edev->max_supported && edev->max_supported <= index))
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return -EINVAL;
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state = cable_state ? (1 << index) : 0;
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return extcon_update_state(edev, 1 << index, state);
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}
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EXPORT_SYMBOL_GPL(extcon_set_cable_state_);
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/**
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* extcon_set_cable_state() - Set the status of a specific cable.
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* @edev: the extcon device that has the cable.
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* @cable_name: cable name.
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* @cable_state: the new cable status. The default semantics is
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* true: attached / false: detached.
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*
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* Note that this is slower than extcon_set_cable_state_.
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*/
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int extcon_set_cable_state(struct extcon_dev *edev,
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const char *cable_name, bool cable_state)
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{
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return extcon_set_cable_state_(edev, extcon_find_cable_index
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(edev, cable_name), cable_state);
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}
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EXPORT_SYMBOL_GPL(extcon_set_cable_state);
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/**
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* extcon_get_extcon_dev() - Get the extcon device instance from the name
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* @extcon_name: The extcon name provided with extcon_dev_register()
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*/
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struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
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{
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struct extcon_dev *sd;
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mutex_lock(&extcon_dev_list_lock);
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list_for_each_entry(sd, &extcon_dev_list, entry) {
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if (!strcmp(sd->name, extcon_name))
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goto out;
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}
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sd = NULL;
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out:
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mutex_unlock(&extcon_dev_list_lock);
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return sd;
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}
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EXPORT_SYMBOL_GPL(extcon_get_extcon_dev);
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static int _call_per_cable(struct notifier_block *nb, unsigned long val,
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void *ptr)
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{
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struct extcon_specific_cable_nb *obj = container_of(nb,
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struct extcon_specific_cable_nb, internal_nb);
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struct extcon_dev *edev = ptr;
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if ((val & (1 << obj->cable_index)) !=
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(edev->state & (1 << obj->cable_index))) {
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bool cable_state = true;
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obj->previous_value = val;
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if (val & (1 << obj->cable_index))
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cable_state = false;
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return obj->user_nb->notifier_call(obj->user_nb,
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cable_state, ptr);
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}
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return NOTIFY_OK;
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}
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/**
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* extcon_register_interest() - Register a notifier for a state change of a
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* specific cable, not an entier set of cables of a
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* extcon device.
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* @obj: an empty extcon_specific_cable_nb object to be returned.
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* @extcon_name: the name of extcon device.
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* if NULL, extcon_register_interest will register
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* every cable with the target cable_name given.
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* @cable_name: the target cable name.
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* @nb: the notifier block to get notified.
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*
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* Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets
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* the struct for you.
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*
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* extcon_register_interest is a helper function for those who want to get
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* notification for a single specific cable's status change. If a user wants
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* to get notification for any changes of all cables of a extcon device,
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* he/she should use the general extcon_register_notifier().
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*
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* Note that the second parameter given to the callback of nb (val) is
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* "old_state", not the current state. The current state can be retrieved
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* by looking at the third pameter (edev pointer)'s state value.
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*/
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int extcon_register_interest(struct extcon_specific_cable_nb *obj,
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const char *extcon_name, const char *cable_name,
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struct notifier_block *nb)
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{
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unsigned long flags;
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int ret;
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if (!obj || !cable_name || !nb)
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return -EINVAL;
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if (extcon_name) {
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obj->edev = extcon_get_extcon_dev(extcon_name);
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if (!obj->edev)
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return -ENODEV;
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obj->cable_index = extcon_find_cable_index(obj->edev,
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cable_name);
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if (obj->cable_index < 0)
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return obj->cable_index;
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obj->user_nb = nb;
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obj->internal_nb.notifier_call = _call_per_cable;
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spin_lock_irqsave(&obj->edev->lock, flags);
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ret = raw_notifier_chain_register(&obj->edev->nh,
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&obj->internal_nb);
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spin_unlock_irqrestore(&obj->edev->lock, flags);
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return ret;
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} else {
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struct class_dev_iter iter;
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struct extcon_dev *extd;
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struct device *dev;
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if (!extcon_class)
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return -ENODEV;
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class_dev_iter_init(&iter, extcon_class, NULL, NULL);
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while ((dev = class_dev_iter_next(&iter))) {
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extd = dev_get_drvdata(dev);
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if (extcon_find_cable_index(extd, cable_name) < 0)
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continue;
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|
|
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)
|
|
{
|
|
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->internal_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.
|
|
* @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)
|
|
{
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&edev->lock, flags);
|
|
ret = raw_notifier_chain_register(&edev->nh, 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.
|
|
* @nb: a registered notifier block to be unregistered.
|
|
*/
|
|
int extcon_unregister_notifier(struct extcon_dev *edev,
|
|
struct notifier_block *nb)
|
|
{
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&edev->lock, flags);
|
|
ret = raw_notifier_chain_unregister(&edev->nh, 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 cable names ending with NULL.
|
|
* 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 char **supported_cable)
|
|
{
|
|
struct extcon_dev *edev;
|
|
|
|
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 cable names ending with NULL.
|
|
* 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 char **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;
|
|
|
|
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 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->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);
|
|
|
|
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");
|