mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 04:26:39 +07:00
5b11ebedd6
Function get_zeroed_page() returns a NULL pointer if there is no enough
memory. In function extcon_sync(), it returns 0 if the call to
get_zeroed_page() fails. The return value 0 indicates success in the
context, which is incosistent with the execution status. This patch
fixes the bug by returning -ENOMEM.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=188611
Signed-off-by: Pan Bian <bianpan2016@163.com>
Fixes: a580982f08
Cc: stable <stable@vger.kernel.org>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1387 lines
35 KiB
C
1387 lines
35 KiB
C
/*
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* drivers/extcon/extcon.c - External Connector (extcon) framework.
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*
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* External connector (extcon) class driver
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*
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* Copyright (C) 2015 Samsung Electronics
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* Author: Chanwoo Choi <cw00.choi@samsung.com>
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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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#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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#define SUPPORTED_CABLE_MAX 32
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#define CABLE_NAME_MAX 30
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struct __extcon_info {
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unsigned int type;
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unsigned int id;
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const char *name;
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} extcon_info[] = {
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[EXTCON_NONE] = {
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.type = EXTCON_TYPE_MISC,
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.id = EXTCON_NONE,
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.name = "NONE",
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},
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/* USB external connector */
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[EXTCON_USB] = {
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.type = EXTCON_TYPE_USB,
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.id = EXTCON_USB,
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.name = "USB",
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},
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[EXTCON_USB_HOST] = {
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.type = EXTCON_TYPE_USB,
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.id = EXTCON_USB_HOST,
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.name = "USB_HOST",
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},
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/* Charging external connector */
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[EXTCON_CHG_USB_SDP] = {
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.type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
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.id = EXTCON_CHG_USB_SDP,
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.name = "SDP",
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},
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[EXTCON_CHG_USB_DCP] = {
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.type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
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.id = EXTCON_CHG_USB_DCP,
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.name = "DCP",
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},
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[EXTCON_CHG_USB_CDP] = {
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.type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
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.id = EXTCON_CHG_USB_CDP,
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.name = "CDP",
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},
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[EXTCON_CHG_USB_ACA] = {
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.type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
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.id = EXTCON_CHG_USB_ACA,
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.name = "ACA",
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},
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[EXTCON_CHG_USB_FAST] = {
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.type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
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.id = EXTCON_CHG_USB_FAST,
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.name = "FAST-CHARGER",
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},
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[EXTCON_CHG_USB_SLOW] = {
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.type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
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.id = EXTCON_CHG_USB_SLOW,
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.name = "SLOW-CHARGER",
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},
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[EXTCON_CHG_WPT] = {
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.type = EXTCON_TYPE_CHG,
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.id = EXTCON_CHG_WPT,
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.name = "WPT",
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},
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/* Jack external connector */
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[EXTCON_JACK_MICROPHONE] = {
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.type = EXTCON_TYPE_JACK,
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.id = EXTCON_JACK_MICROPHONE,
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.name = "MICROPHONE",
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},
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[EXTCON_JACK_HEADPHONE] = {
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.type = EXTCON_TYPE_JACK,
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.id = EXTCON_JACK_HEADPHONE,
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.name = "HEADPHONE",
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},
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[EXTCON_JACK_LINE_IN] = {
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.type = EXTCON_TYPE_JACK,
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.id = EXTCON_JACK_LINE_IN,
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.name = "LINE-IN",
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},
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[EXTCON_JACK_LINE_OUT] = {
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.type = EXTCON_TYPE_JACK,
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.id = EXTCON_JACK_LINE_OUT,
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.name = "LINE-OUT",
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},
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[EXTCON_JACK_VIDEO_IN] = {
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.type = EXTCON_TYPE_JACK,
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.id = EXTCON_JACK_VIDEO_IN,
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.name = "VIDEO-IN",
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},
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[EXTCON_JACK_VIDEO_OUT] = {
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.type = EXTCON_TYPE_JACK,
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.id = EXTCON_JACK_VIDEO_OUT,
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.name = "VIDEO-OUT",
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},
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[EXTCON_JACK_SPDIF_IN] = {
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.type = EXTCON_TYPE_JACK,
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.id = EXTCON_JACK_SPDIF_IN,
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.name = "SPDIF-IN",
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},
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[EXTCON_JACK_SPDIF_OUT] = {
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.type = EXTCON_TYPE_JACK,
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.id = EXTCON_JACK_SPDIF_OUT,
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.name = "SPDIF-OUT",
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},
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/* Display external connector */
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[EXTCON_DISP_HDMI] = {
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.type = EXTCON_TYPE_DISP,
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.id = EXTCON_DISP_HDMI,
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.name = "HDMI",
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},
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[EXTCON_DISP_MHL] = {
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.type = EXTCON_TYPE_DISP,
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.id = EXTCON_DISP_MHL,
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.name = "MHL",
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},
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[EXTCON_DISP_DVI] = {
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.type = EXTCON_TYPE_DISP,
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.id = EXTCON_DISP_DVI,
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.name = "DVI",
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},
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[EXTCON_DISP_VGA] = {
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.type = EXTCON_TYPE_DISP,
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.id = EXTCON_DISP_VGA,
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.name = "VGA",
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},
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[EXTCON_DISP_DP] = {
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.type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB,
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.id = EXTCON_DISP_DP,
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.name = "DP",
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},
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[EXTCON_DISP_HMD] = {
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.type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB,
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.id = EXTCON_DISP_HMD,
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.name = "HMD",
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},
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/* Miscellaneous external connector */
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[EXTCON_DOCK] = {
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.type = EXTCON_TYPE_MISC,
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.id = EXTCON_DOCK,
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.name = "DOCK",
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},
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[EXTCON_JIG] = {
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.type = EXTCON_TYPE_MISC,
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.id = EXTCON_JIG,
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.name = "JIG",
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},
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[EXTCON_MECHANICAL] = {
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.type = EXTCON_TYPE_MISC,
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.id = EXTCON_MECHANICAL,
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.name = "MECHANICAL",
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},
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{ /* sentinel */ }
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};
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/**
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* struct extcon_cable - An internal data for each cable of extcon device.
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* @edev: The extcon device
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* @cable_index: Index of this cable in the edev
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* @attr_g: Attribute group for the cable
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* @attr_name: "name" sysfs entry
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* @attr_state: "state" sysfs entry
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* @attrs: Array pointing to attr_name and attr_state for attr_g
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*/
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struct extcon_cable {
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struct extcon_dev *edev;
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int cable_index;
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struct attribute_group attr_g;
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struct device_attribute attr_name;
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struct device_attribute attr_state;
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struct attribute *attrs[3]; /* to be fed to attr_g.attrs */
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union extcon_property_value usb_propval[EXTCON_PROP_USB_CNT];
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union extcon_property_value chg_propval[EXTCON_PROP_CHG_CNT];
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union extcon_property_value jack_propval[EXTCON_PROP_JACK_CNT];
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union extcon_property_value disp_propval[EXTCON_PROP_DISP_CNT];
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unsigned long usb_bits[BITS_TO_LONGS(EXTCON_PROP_USB_CNT)];
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unsigned long chg_bits[BITS_TO_LONGS(EXTCON_PROP_CHG_CNT)];
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unsigned long jack_bits[BITS_TO_LONGS(EXTCON_PROP_JACK_CNT)];
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unsigned long disp_bits[BITS_TO_LONGS(EXTCON_PROP_DISP_CNT)];
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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 int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id)
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{
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int i;
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/* Find the the index of extcon cable in edev->supported_cable */
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for (i = 0; i < edev->max_supported; i++) {
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if (edev->supported_cable[i] == id)
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return i;
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}
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return -EINVAL;
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}
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static int get_extcon_type(unsigned int prop)
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{
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switch (prop) {
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case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
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return EXTCON_TYPE_USB;
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case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
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return EXTCON_TYPE_CHG;
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case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
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return EXTCON_TYPE_JACK;
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case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
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return EXTCON_TYPE_DISP;
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default:
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return -EINVAL;
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}
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}
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static bool is_extcon_attached(struct extcon_dev *edev, unsigned int index)
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{
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return !!(edev->state & BIT(index));
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}
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static bool is_extcon_changed(struct extcon_dev *edev, int index,
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bool new_state)
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{
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int state = !!(edev->state & BIT(index));
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return (state != new_state);
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}
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static bool is_extcon_property_supported(unsigned int id, unsigned int prop)
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{
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int type;
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/* Check whether the property is supported or not. */
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type = get_extcon_type(prop);
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if (type < 0)
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return false;
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/* Check whether a specific extcon id supports the property or not. */
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return !!(extcon_info[id].type & type);
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}
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static int is_extcon_property_capability(struct extcon_dev *edev,
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unsigned int id, int index,unsigned int prop)
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{
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struct extcon_cable *cable;
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int type, ret;
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/* Check whether the property is supported or not. */
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type = get_extcon_type(prop);
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if (type < 0)
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return type;
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cable = &edev->cables[index];
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switch (type) {
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case EXTCON_TYPE_USB:
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ret = test_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
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break;
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case EXTCON_TYPE_CHG:
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ret = test_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
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break;
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case EXTCON_TYPE_JACK:
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ret = test_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
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break;
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case EXTCON_TYPE_DISP:
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ret = test_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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static void init_property(struct extcon_dev *edev, unsigned int id, int index)
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{
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unsigned int type = extcon_info[id].type;
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struct extcon_cable *cable = &edev->cables[index];
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if (EXTCON_TYPE_USB & type)
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memset(cable->usb_propval, 0, sizeof(cable->usb_propval));
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if (EXTCON_TYPE_CHG & type)
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memset(cable->chg_propval, 0, sizeof(cable->chg_propval));
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if (EXTCON_TYPE_JACK & type)
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memset(cable->jack_propval, 0, sizeof(cable->jack_propval));
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if (EXTCON_TYPE_DISP & type)
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memset(cable->disp_propval, 0, sizeof(cable->disp_propval));
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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->max_supported == 0)
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return sprintf(buf, "%u\n", edev->state);
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for (i = 0; i < edev->max_supported; i++) {
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count += sprintf(buf + count, "%s=%d\n",
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extcon_info[edev->supported_cable[i]].name,
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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 DEVICE_ATTR_RO(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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return sprintf(buf, "%s\n", edev->name);
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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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int i = cable->cable_index;
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return sprintf(buf, "%s\n",
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extcon_info[cable->edev->supported_cable[i]].name);
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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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int i = cable->cable_index;
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return sprintf(buf, "%d\n",
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extcon_get_state(cable->edev, cable->edev->supported_cable[i]));
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}
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/**
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* extcon_sync() - Synchronize the states for both the attached/detached
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* @edev: the extcon device that has the cable.
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*
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* This function send a notification to synchronize the all states of a
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* specific external connector
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*/
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int extcon_sync(struct extcon_dev *edev, unsigned int id)
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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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int index;
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int state;
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unsigned long flags;
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if (!edev)
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return -EINVAL;
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index = find_cable_index_by_id(edev, id);
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if (index < 0)
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return index;
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spin_lock_irqsave(&edev->lock, flags);
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state = !!(edev->state & BIT(index));
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raw_notifier_call_chain(&edev->nh[index], 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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/* 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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return -ENOMEM;
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}
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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), "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), "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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|
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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);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(extcon_sync);
|
|
|
|
/**
|
|
* extcon_get_state() - Get the state of a external connector.
|
|
* @edev: the extcon device that has the cable.
|
|
* @id: the unique id of each external connector in extcon enumeration.
|
|
*/
|
|
int extcon_get_state(struct extcon_dev *edev, const unsigned int id)
|
|
{
|
|
int index, state;
|
|
unsigned long flags;
|
|
|
|
if (!edev)
|
|
return -EINVAL;
|
|
|
|
index = find_cable_index_by_id(edev, id);
|
|
if (index < 0)
|
|
return index;
|
|
|
|
spin_lock_irqsave(&edev->lock, flags);
|
|
state = is_extcon_attached(edev, index);
|
|
spin_unlock_irqrestore(&edev->lock, flags);
|
|
|
|
return state;
|
|
}
|
|
EXPORT_SYMBOL_GPL(extcon_get_state);
|
|
|
|
/**
|
|
* extcon_set_state() - Set the state of a external connector.
|
|
* without a notification.
|
|
* @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.
|
|
*
|
|
* This function only set the state of a external connector without
|
|
* a notification. To synchronize the data of a external connector,
|
|
* use extcon_set_state_sync() and extcon_sync().
|
|
*/
|
|
int extcon_set_state(struct extcon_dev *edev, unsigned int id,
|
|
bool cable_state)
|
|
{
|
|
unsigned long flags;
|
|
int index, ret = 0;
|
|
|
|
if (!edev)
|
|
return -EINVAL;
|
|
|
|
index = find_cable_index_by_id(edev, id);
|
|
if (index < 0)
|
|
return index;
|
|
|
|
spin_lock_irqsave(&edev->lock, flags);
|
|
|
|
/* Check whether the external connector's state is changed. */
|
|
if (!is_extcon_changed(edev, index, cable_state))
|
|
goto out;
|
|
|
|
if (check_mutually_exclusive(edev,
|
|
(edev->state & ~BIT(index)) | (cable_state & BIT(index)))) {
|
|
ret = -EPERM;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Initialize the value of extcon property before setting
|
|
* the detached state for an external connector.
|
|
*/
|
|
if (!cable_state)
|
|
init_property(edev, id, index);
|
|
|
|
/* Update the state for a external connector. */
|
|
if (cable_state)
|
|
edev->state |= BIT(index);
|
|
else
|
|
edev->state &= ~(BIT(index));
|
|
out:
|
|
spin_unlock_irqrestore(&edev->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(extcon_set_state);
|
|
|
|
/**
|
|
* extcon_set_state_sync() - Set the state of a external connector
|
|
* with a notification.
|
|
* @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.
|
|
*
|
|
* This function set the state of external connector and synchronize the data
|
|
* by usning a notification.
|
|
*/
|
|
int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id,
|
|
bool cable_state)
|
|
{
|
|
int ret, index;
|
|
unsigned long flags;
|
|
|
|
index = find_cable_index_by_id(edev, id);
|
|
if (index < 0)
|
|
return index;
|
|
|
|
/* Check whether the external connector's state is changed. */
|
|
spin_lock_irqsave(&edev->lock, flags);
|
|
ret = is_extcon_changed(edev, index, cable_state);
|
|
spin_unlock_irqrestore(&edev->lock, flags);
|
|
if (!ret)
|
|
return 0;
|
|
|
|
ret = extcon_set_state(edev, id, cable_state);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return extcon_sync(edev, id);
|
|
}
|
|
EXPORT_SYMBOL_GPL(extcon_set_state_sync);
|
|
|
|
/**
|
|
* extcon_get_property() - Get the property value of a specific cable.
|
|
* @edev: the extcon device that has the cable.
|
|
* @id: the unique id of each external connector
|
|
* in extcon enumeration.
|
|
* @prop: the property id among enum extcon_property.
|
|
* @prop_val: the pointer which store the value of property.
|
|
*
|
|
* When getting the property value of external connector, the external connector
|
|
* should be attached. If detached state, function just return 0 without
|
|
* property value. Also, the each property should be included in the list of
|
|
* supported properties according to the type of external connectors.
|
|
*
|
|
* Returns 0 if success or error number if fail
|
|
*/
|
|
int extcon_get_property(struct extcon_dev *edev, unsigned int id,
|
|
unsigned int prop,
|
|
union extcon_property_value *prop_val)
|
|
{
|
|
struct extcon_cable *cable;
|
|
unsigned long flags;
|
|
int index, ret = 0;
|
|
|
|
*prop_val = (union extcon_property_value)(0);
|
|
|
|
if (!edev)
|
|
return -EINVAL;
|
|
|
|
/* Check whether the property is supported or not */
|
|
if (!is_extcon_property_supported(id, prop))
|
|
return -EINVAL;
|
|
|
|
/* Find the cable index of external connector by using id */
|
|
index = find_cable_index_by_id(edev, id);
|
|
if (index < 0)
|
|
return index;
|
|
|
|
spin_lock_irqsave(&edev->lock, flags);
|
|
|
|
/* Check whether the property is available or not. */
|
|
if (!is_extcon_property_capability(edev, id, index, prop)) {
|
|
spin_unlock_irqrestore(&edev->lock, flags);
|
|
return -EPERM;
|
|
}
|
|
|
|
/*
|
|
* Check whether the external connector is attached.
|
|
* If external connector is detached, the user can not
|
|
* get the property value.
|
|
*/
|
|
if (!is_extcon_attached(edev, index)) {
|
|
spin_unlock_irqrestore(&edev->lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
cable = &edev->cables[index];
|
|
|
|
/* Get the property value according to extcon type */
|
|
switch (prop) {
|
|
case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
|
|
*prop_val = cable->usb_propval[prop - EXTCON_PROP_USB_MIN];
|
|
break;
|
|
case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
|
|
*prop_val = cable->chg_propval[prop - EXTCON_PROP_CHG_MIN];
|
|
break;
|
|
case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
|
|
*prop_val = cable->jack_propval[prop - EXTCON_PROP_JACK_MIN];
|
|
break;
|
|
case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
|
|
*prop_val = cable->disp_propval[prop - EXTCON_PROP_DISP_MIN];
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&edev->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(extcon_get_property);
|
|
|
|
/**
|
|
* extcon_set_property() - Set the property value of a specific cable.
|
|
* @edev: the extcon device that has the cable.
|
|
* @id: the unique id of each external connector
|
|
* in extcon enumeration.
|
|
* @prop: the property id among enum extcon_property.
|
|
* @prop_val: the pointer including the new value of property.
|
|
*
|
|
* The each property should be included in the list of supported properties
|
|
* according to the type of external connectors.
|
|
*
|
|
* Returns 0 if success or error number if fail
|
|
*/
|
|
int extcon_set_property(struct extcon_dev *edev, unsigned int id,
|
|
unsigned int prop,
|
|
union extcon_property_value prop_val)
|
|
{
|
|
struct extcon_cable *cable;
|
|
unsigned long flags;
|
|
int index, ret = 0;
|
|
|
|
if (!edev)
|
|
return -EINVAL;
|
|
|
|
/* Check whether the property is supported or not */
|
|
if (!is_extcon_property_supported(id, prop))
|
|
return -EINVAL;
|
|
|
|
/* Find the cable index of external connector by using id */
|
|
index = find_cable_index_by_id(edev, id);
|
|
if (index < 0)
|
|
return index;
|
|
|
|
spin_lock_irqsave(&edev->lock, flags);
|
|
|
|
/* Check whether the property is available or not. */
|
|
if (!is_extcon_property_capability(edev, id, index, prop)) {
|
|
spin_unlock_irqrestore(&edev->lock, flags);
|
|
return -EPERM;
|
|
}
|
|
|
|
cable = &edev->cables[index];
|
|
|
|
/* Set the property value according to extcon type */
|
|
switch (prop) {
|
|
case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX:
|
|
cable->usb_propval[prop - EXTCON_PROP_USB_MIN] = prop_val;
|
|
break;
|
|
case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX:
|
|
cable->chg_propval[prop - EXTCON_PROP_CHG_MIN] = prop_val;
|
|
break;
|
|
case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX:
|
|
cable->jack_propval[prop - EXTCON_PROP_JACK_MIN] = prop_val;
|
|
break;
|
|
case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX:
|
|
cable->disp_propval[prop - EXTCON_PROP_DISP_MIN] = prop_val;
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&edev->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(extcon_set_property);
|
|
|
|
/**
|
|
* extcon_set_property_sync() - Set the property value of a specific cable
|
|
with a notification.
|
|
* @prop_val: the pointer including the new value of property.
|
|
*
|
|
* When setting the property value of external connector, the external connector
|
|
* should be attached. The each property should be included in the list of
|
|
* supported properties according to the type of external connectors.
|
|
*
|
|
* Returns 0 if success or error number if fail
|
|
*/
|
|
int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id,
|
|
unsigned int prop,
|
|
union extcon_property_value prop_val)
|
|
{
|
|
int ret;
|
|
|
|
ret = extcon_set_property(edev, id, prop, prop_val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return extcon_sync(edev, id);
|
|
}
|
|
EXPORT_SYMBOL_GPL(extcon_set_property_sync);
|
|
|
|
/**
|
|
* extcon_get_property_capability() - Get the capability of property
|
|
* of an external connector.
|
|
* @edev: the extcon device that has the cable.
|
|
* @id: the unique id of each external connector
|
|
* in extcon enumeration.
|
|
* @prop: the property id among enum extcon_property.
|
|
*
|
|
* Returns 1 if the property is available or 0 if not available.
|
|
*/
|
|
int extcon_get_property_capability(struct extcon_dev *edev, unsigned int id,
|
|
unsigned int prop)
|
|
{
|
|
int index;
|
|
|
|
if (!edev)
|
|
return -EINVAL;
|
|
|
|
/* Check whether the property is supported or not */
|
|
if (!is_extcon_property_supported(id, prop))
|
|
return -EINVAL;
|
|
|
|
/* Find the cable index of external connector by using id */
|
|
index = find_cable_index_by_id(edev, id);
|
|
if (index < 0)
|
|
return index;
|
|
|
|
return is_extcon_property_capability(edev, id, index, prop);
|
|
}
|
|
EXPORT_SYMBOL_GPL(extcon_get_property_capability);
|
|
|
|
/**
|
|
* extcon_set_property_capability() - Set the capability of a property
|
|
* of an external connector.
|
|
* @edev: the extcon device that has the cable.
|
|
* @id: the unique id of each external connector
|
|
* in extcon enumeration.
|
|
* @prop: the property id among enum extcon_property.
|
|
*
|
|
* This function set the capability of a property for an external connector
|
|
* to mark the bit in capability bitmap which mean the available state of
|
|
* a property.
|
|
*
|
|
* Returns 0 if success or error number if fail
|
|
*/
|
|
int extcon_set_property_capability(struct extcon_dev *edev, unsigned int id,
|
|
unsigned int prop)
|
|
{
|
|
struct extcon_cable *cable;
|
|
int index, type, ret = 0;
|
|
|
|
if (!edev)
|
|
return -EINVAL;
|
|
|
|
/* Check whether the property is supported or not. */
|
|
if (!is_extcon_property_supported(id, prop))
|
|
return -EINVAL;
|
|
|
|
/* Find the cable index of external connector by using id. */
|
|
index = find_cable_index_by_id(edev, id);
|
|
if (index < 0)
|
|
return index;
|
|
|
|
type = get_extcon_type(prop);
|
|
if (type < 0)
|
|
return type;
|
|
|
|
cable = &edev->cables[index];
|
|
|
|
switch (type) {
|
|
case EXTCON_TYPE_USB:
|
|
__set_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits);
|
|
break;
|
|
case EXTCON_TYPE_CHG:
|
|
__set_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits);
|
|
break;
|
|
case EXTCON_TYPE_JACK:
|
|
__set_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits);
|
|
break;
|
|
case EXTCON_TYPE_DISP:
|
|
__set_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(extcon_set_property_capability);
|
|
|
|
/**
|
|
* 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_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 = -EINVAL;
|
|
|
|
if (!nb)
|
|
return -EINVAL;
|
|
|
|
if (edev) {
|
|
idx = find_cable_index_by_id(edev, id);
|
|
if (idx < 0)
|
|
return idx;
|
|
|
|
spin_lock_irqsave(&edev->lock, flags);
|
|
ret = raw_notifier_chain_register(&edev->nh[idx], nb);
|
|
spin_unlock_irqrestore(&edev->lock, flags);
|
|
} else {
|
|
struct extcon_dev *extd;
|
|
|
|
mutex_lock(&extcon_dev_list_lock);
|
|
list_for_each_entry(extd, &extcon_dev_list, entry) {
|
|
idx = find_cable_index_by_id(extd, id);
|
|
if (idx >= 0)
|
|
break;
|
|
}
|
|
mutex_unlock(&extcon_dev_list_lock);
|
|
|
|
if (idx >= 0) {
|
|
edev = extd;
|
|
return extcon_register_notifier(extd, id, nb);
|
|
} else {
|
|
ret = -ENODEV;
|
|
}
|
|
}
|
|
|
|
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);
|
|
if (idx < 0)
|
|
return idx;
|
|
|
|
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);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
#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_dbg(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_dbg(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);
|
|
of_node_put(node);
|
|
return edev;
|
|
}
|
|
}
|
|
mutex_unlock(&extcon_dev_list_lock);
|
|
of_node_put(node);
|
|
|
|
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");
|