/*
* 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,
};
/**
* struct extcon_cable - An internal data for each cable of extcon device.
* @edev: The extcon device
* @cable_index: Index of this cable in the edev
* @attr_g: Attribute group for the cable
* @attr_name: "name" sysfs entry
* @attr_state: "state" sysfs entry
* @attrs: Array pointing to attr_name and attr_state for attr_g
*/
struct extcon_cable {
struct extcon_dev *edev;
int cable_index;
struct attribute_group attr_g;
struct device_attribute attr_name;
struct device_attribute attr_state;
struct attribute *attrs[3]; /* to be fed to attr_g.attrs */
};
static struct class *extcon_class;
#if defined(CONFIG_ANDROID)
static struct class_compat *switch_class;
#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 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 =