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![Wang, Xiaoming](/assets/img/avatar_default.png)
(edev->extcon_dev_type.groups) has been freed before device_unregister. extcon_dev_unregister -> kfree(edev->extcon_dev_type.groups) then device_unregister -> device_del -> device_remove_attrs -> device_remove_groups(dev, type->groups); panic because type->groups has been freed. This patch is move device_unregister ahead of groups free to avoid panic in extcon_dev_unregister. stack [ 22.847226] BUG: unable to handle kernel paging request at 5f39746e [ 22.847234] IP: [<c1387fcd>] sysfs_remove_group+0x2d/0xd0 [ 22.847238] *pdpt = 0000000000000000 *pde = 0000000000000000 [ 22.847241] Oops: 0000 [#1] PREEMPT SMP [ 22.847244] Modules linked in: [ 22.847249] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 3.10.16-261140-g6533774 #1 [ 22.847251] task: f3078000 ti: f3072000 task.ti: f3072000 [ 22.847254] EIP: 0060:[<c1387fcd>] EFLAGS: 00010206 CPU: 0 [ 22.847257] EIP is at sysfs_remove_group+0x2d/0xd0 [ 22.847259] EAX: 00000004 EBX: 5f39746e ECX: 00000000 EDX: f2773560 [ 22.847261] ESI: f2653b80 EDI: f2773560 EBP: f3073c90 ESP: f3073c70 [ 22.847263] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 [ 22.847264] CR0: 8005003b CR2: 5f39746e CR3: 020e5000 CR4: 001007f0 [ 22.847266] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [ 22.847268] DR6: ffff0ff0 DR7: 00000400 [ 22.847269] Stack: [ 22.847276] c13848c9 c1ae3805 f3073c80 f24ddc4c 00000246 f2773e88 f1c44408 f2531340 [ 22.847283] f3073ca0 c16935ca f1c44400 f27d3340 f3073cb4 c1693858 f24ddc44 f1c44400 [ 22.847289] f1c4420c f3073cc8 c1693f76 f1c44400 00000001 00000000 f3073ce8 c1694011 [ 22.847290] Call Trace: [ 22.847295] [<c13848c9>] ? sysfs_hash_and_remove+0x49/0xa0 [ 22.847300] [<c1ae3805>] ? sub_preempt_count+0x55/0xe0 [ 22.847306] [<c16935ca>] device_remove_groups+0x2a/0x40 [ 22.847309] [<c1693858>] device_remove_attrs+0x38/0x60 [ 22.847313] [<c1693f76>] device_del+0xd6/0x150 [ 22.847316] [<c1694011>] device_unregister+0x21/0x60 [ 22.847320] [<c13869e8>] ? sysfs_remove_link+0x18/0x30 [ 22.847323] [<c1697d04>] ? class_compat_remove_link+0x34/0x50 [ 22.847329] [<c18bf5d9>] extcon_dev_unregister+0xf9/0x130 [ 22.847333] [<c18bd21f>] pwrsrc_extcon_dev_reg_callback+0x7f/0xa0 [ 22.847337] [<c1ae36e3>] notifier_call_chain+0x43/0x60 [ 22.847343] [<c12634e1>] __blocking_notifier_call_chain+0x41/0x80 [ 22.847347] [<c126353f>] blocking_notifier_call_chain+0x1f/0x30 [ 22.847351] [<c18bef39>] extcon_dev_notify_add_device+0x19/0x20 [ 22.847354] [<c18bf074>] extcon_dev_register+0x134/0x580 [ 22.847358] [<c1ae3805>] ? sub_preempt_count+0x55/0xe0 [ 22.847363] [<c154b4da>] ? gpiod_request+0x6a/0x1d0 [ 22.847368] [<c132528a>] ? kmem_cache_alloc_trace+0xaa/0x170 [ 22.847372] [<c18c0179>] ? fsa9285_probe+0x99/0x3f0 [ 22.847375] [<c18c00e0>] ? fsa9285_irq_handler+0xf0/0xf0 [ 22.847379] [<c18c019f>] fsa9285_probe+0xbf/0x3f0 [ 22.847383] [<c18c00e0>] ? fsa9285_irq_handler+0xf0/0xf0 [ 22.847388] [<c1828d9e>] i2c_device_probe+0x7e/0xf0 [ 22.847392] [<c1386e52>] ? sysfs_create_link+0x22/0x40 [ 22.847395] [<c1696c62>] ? driver_sysfs_add+0x72/0xa0 [ 22.847399] [<c1697119>] driver_probe_device+0x79/0x360 [ 22.847403] [<c1697491>] __driver_attach+0x91/0xa0 [ 22.847407] [<c1697400>] ? driver_probe_device+0x360/0x360 [ 22.847410] [<c16955a2>] bus_for_each_dev+0x42/0x80 [ 22.847414] [<c1696bee>] driver_attach+0x1e/0x20 [ 22.847417] [<c1697400>] ? driver_probe_device+0x360/0x360 [ 22.847420] [<c169675f>] bus_add_driver+0xef/0x270 [ 22.847425] [<c1828e10>] ? i2c_device_probe+0xf0/0xf0 [ 22.847428] [<c1828e10>] ? i2c_device_probe+0xf0/0xf0 [ 22.847432] [<c1697a8a>] driver_register+0x6a/0x160 [ 22.847436] [<c1addb3d>] ? mutex_unlock+0xd/0x10 [ 22.847440] [<c1438ab2>] ? __create_file+0x122/0x2a0 [ 22.847446] [<c20557d3>] ? extcon_class_init+0x15/0x15 [ 22.847450] [<c1827cbb>] i2c_register_driver+0x2b/0xd0 [ 22.847454] [<c1438d05>] ? debugfs_create_file+0x35/0x40 [ 22.847458] [<c20557d3>] ? extcon_class_init+0x15/0x15 [ 22.847461] [<c20557e4>] fsa9285_extcon_init+0x11/0x29 [ 22.847465] [<c12001aa>] do_one_initcall+0xba/0x170 [ 22.847471] [<c2012b4a>] kernel_init_freeable+0x119/0x1b8 [ 22.847475] [<c20124d3>] ? do_early_param+0x7a/0x7a [ 22.847480] [<c1ac4090>] kernel_init+0x10/0xd0 [ 22.847485] [<c1ae6cf7>] ret_from_kernel_thread+0x1b/0x28 [ 22.847488] [<c1ac4080>] ? rest_init+0x80/0x80 Tested-by: Liu, Chuansheng <chuansheng.liu@intel.com> Reviewed-by: Liu, Chuansheng <chuansheng.liu@intel.com> Signed-off-by: xiaoming wang <xiaoming.wang@intel.com> Signed-off-by: Zhang Dongxing <dongxing.zhang@intel.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
840 lines
23 KiB
C
840 lines
23 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/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.
|
|
*
|
|
* Note that this is slower than extcon_set_cable_state_.
|
|
*/
|
|
int extcon_set_cable_state(struct extcon_dev *edev,
|
|
const char *cable_name, bool cable_state)
|
|
{
|
|
return extcon_set_cable_state_(edev, extcon_find_cable_index
|
|
(edev, cable_name), cable_state);
|
|
}
|
|
EXPORT_SYMBOL_GPL(extcon_set_cable_state);
|
|
|
|
/**
|
|
* extcon_get_extcon_dev() - Get the extcon device instance from the name
|
|
* @extcon_name: The extcon name provided with extcon_dev_register()
|
|
*/
|
|
struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
|
|
{
|
|
struct extcon_dev *sd;
|
|
|
|
mutex_lock(&extcon_dev_list_lock);
|
|
list_for_each_entry(sd, &extcon_dev_list, entry) {
|
|
if (!strcmp(sd->name, extcon_name))
|
|
goto out;
|
|
}
|
|
sd = NULL;
|
|
out:
|
|
mutex_unlock(&extcon_dev_list_lock);
|
|
return sd;
|
|
}
|
|
EXPORT_SYMBOL_GPL(extcon_get_extcon_dev);
|
|
|
|
static int _call_per_cable(struct notifier_block *nb, unsigned long val,
|
|
void *ptr)
|
|
{
|
|
struct extcon_specific_cable_nb *obj = container_of(nb,
|
|
struct extcon_specific_cable_nb, internal_nb);
|
|
struct extcon_dev *edev = ptr;
|
|
|
|
if ((val & (1 << obj->cable_index)) !=
|
|
(edev->state & (1 << obj->cable_index))) {
|
|
bool cable_state = true;
|
|
|
|
obj->previous_value = val;
|
|
|
|
if (val & (1 << obj->cable_index))
|
|
cable_state = false;
|
|
|
|
return obj->user_nb->notifier_call(obj->user_nb,
|
|
cable_state, ptr);
|
|
}
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
/**
|
|
* extcon_register_interest() - Register a notifier for a state change of a
|
|
* specific cable, not an entier set of cables of a
|
|
* extcon device.
|
|
* @obj: an empty extcon_specific_cable_nb object to be returned.
|
|
* @extcon_name: the name of extcon device.
|
|
* if NULL, extcon_register_interest will register
|
|
* every cable with the target cable_name given.
|
|
* @cable_name: the target cable name.
|
|
* @nb: the notifier block to get notified.
|
|
*
|
|
* Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets
|
|
* the struct for you.
|
|
*
|
|
* extcon_register_interest is a helper function for those who want to get
|
|
* notification for a single specific cable's status change. If a user wants
|
|
* to get notification for any changes of all cables of a extcon device,
|
|
* he/she should use the general extcon_register_notifier().
|
|
*
|
|
* Note that the second parameter given to the callback of nb (val) is
|
|
* "old_state", not the current state. The current state can be retrieved
|
|
* by looking at the third pameter (edev pointer)'s state value.
|
|
*/
|
|
int extcon_register_interest(struct extcon_specific_cable_nb *obj,
|
|
const char *extcon_name, const char *cable_name,
|
|
struct notifier_block *nb)
|
|
{
|
|
if (!obj || !cable_name || !nb)
|
|
return -EINVAL;
|
|
|
|
if (extcon_name) {
|
|
obj->edev = extcon_get_extcon_dev(extcon_name);
|
|
if (!obj->edev)
|
|
return -ENODEV;
|
|
|
|
obj->cable_index = extcon_find_cable_index(obj->edev,
|
|
cable_name);
|
|
if (obj->cable_index < 0)
|
|
return obj->cable_index;
|
|
|
|
obj->user_nb = nb;
|
|
|
|
obj->internal_nb.notifier_call = _call_per_cable;
|
|
|
|
return raw_notifier_chain_register(&obj->edev->nh,
|
|
&obj->internal_nb);
|
|
} else {
|
|
struct class_dev_iter iter;
|
|
struct extcon_dev *extd;
|
|
struct device *dev;
|
|
|
|
if (!extcon_class)
|
|
return -ENODEV;
|
|
class_dev_iter_init(&iter, extcon_class, NULL, NULL);
|
|
while ((dev = class_dev_iter_next(&iter))) {
|
|
extd = dev_get_drvdata(dev);
|
|
|
|
if (extcon_find_cable_index(extd, cable_name) < 0)
|
|
continue;
|
|
|
|
class_dev_iter_exit(&iter);
|
|
return extcon_register_interest(obj, extd->name,
|
|
cable_name, nb);
|
|
}
|
|
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(extcon_register_interest);
|
|
|
|
/**
|
|
* extcon_unregister_interest() - Unregister the notifier registered by
|
|
* extcon_register_interest().
|
|
* @obj: the extcon_specific_cable_nb object returned by
|
|
* extcon_register_interest().
|
|
*/
|
|
int extcon_unregister_interest(struct extcon_specific_cable_nb *obj)
|
|
{
|
|
if (!obj)
|
|
return -EINVAL;
|
|
|
|
return raw_notifier_chain_unregister(&obj->edev->nh, &obj->internal_nb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(extcon_unregister_interest);
|
|
|
|
/**
|
|
* extcon_register_notifier() - Register a notifiee to get notified by
|
|
* any attach status changes from the extcon.
|
|
* @edev: the extcon device.
|
|
* @nb: a notifier block to be registered.
|
|
*
|
|
* Note that the second parameter given to the callback of nb (val) is
|
|
* "old_state", not the current state. The current state can be retrieved
|
|
* by looking at the third pameter (edev pointer)'s state value.
|
|
*/
|
|
int extcon_register_notifier(struct extcon_dev *edev,
|
|
struct notifier_block *nb)
|
|
{
|
|
return raw_notifier_chain_register(&edev->nh, nb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(extcon_register_notifier);
|
|
|
|
/**
|
|
* extcon_unregister_notifier() - Unregister a notifiee from the extcon device.
|
|
* @edev: the extcon device.
|
|
* @nb: a registered notifier block to be unregistered.
|
|
*/
|
|
int extcon_unregister_notifier(struct extcon_dev *edev,
|
|
struct notifier_block *nb)
|
|
{
|
|
return raw_notifier_chain_unregister(&edev->nh, nb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(extcon_unregister_notifier);
|
|
|
|
static struct attribute *extcon_attrs[] = {
|
|
&dev_attr_state.attr,
|
|
&dev_attr_name.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(extcon);
|
|
|
|
static int create_extcon_class(void)
|
|
{
|
|
if (!extcon_class) {
|
|
extcon_class = class_create(THIS_MODULE, "extcon");
|
|
if (IS_ERR(extcon_class))
|
|
return PTR_ERR(extcon_class);
|
|
extcon_class->dev_groups = extcon_groups;
|
|
|
|
#if defined(CONFIG_ANDROID)
|
|
switch_class = class_compat_register("switch");
|
|
if (WARN(!switch_class, "cannot allocate"))
|
|
return -ENOMEM;
|
|
#endif /* CONFIG_ANDROID */
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void extcon_dev_release(struct device *dev)
|
|
{
|
|
}
|
|
|
|
static const char *muex_name = "mutually_exclusive";
|
|
static void dummy_sysfs_dev_release(struct device *dev)
|
|
{
|
|
}
|
|
|
|
/**
|
|
* extcon_dev_register() - Register a new extcon device
|
|
* @edev : the new extcon device (should be allocated before calling)
|
|
*
|
|
* Among the members of edev struct, please set the "user initializing data"
|
|
* in any case and set the "optional callbacks" if required. However, please
|
|
* do not set the values of "internal data", which are initialized by
|
|
* this function.
|
|
*/
|
|
int extcon_dev_register(struct extcon_dev *edev)
|
|
{
|
|
int ret, index = 0;
|
|
|
|
if (!extcon_class) {
|
|
ret = create_extcon_class();
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (edev->supported_cable) {
|
|
/* Get size of array */
|
|
for (index = 0; edev->supported_cable[index]; index++)
|
|
;
|
|
edev->max_supported = index;
|
|
} else {
|
|
edev->max_supported = 0;
|
|
}
|
|
|
|
if (index > SUPPORTED_CABLE_MAX) {
|
|
dev_err(&edev->dev, "extcon: maximum number of supported cables exceeded.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
edev->dev.class = extcon_class;
|
|
edev->dev.release = extcon_dev_release;
|
|
|
|
edev->name = edev->name ? edev->name : dev_name(edev->dev.parent);
|
|
if (IS_ERR_OR_NULL(edev->name)) {
|
|
dev_err(&edev->dev,
|
|
"extcon device name is null\n");
|
|
return -EINVAL;
|
|
}
|
|
dev_set_name(&edev->dev, "%s", edev->name);
|
|
|
|
if (edev->max_supported) {
|
|
char buf[10];
|
|
char *str;
|
|
struct extcon_cable *cable;
|
|
|
|
edev->cables = kzalloc(sizeof(struct extcon_cable) *
|
|
edev->max_supported, GFP_KERNEL);
|
|
if (!edev->cables) {
|
|
ret = -ENOMEM;
|
|
goto err_sysfs_alloc;
|
|
}
|
|
for (index = 0; index < edev->max_supported; index++) {
|
|
cable = &edev->cables[index];
|
|
|
|
snprintf(buf, 10, "cable.%d", index);
|
|
str = kzalloc(sizeof(char) * (strlen(buf) + 1),
|
|
GFP_KERNEL);
|
|
if (!str) {
|
|
for (index--; index >= 0; index--) {
|
|
cable = &edev->cables[index];
|
|
kfree(cable->attr_g.name);
|
|
}
|
|
ret = -ENOMEM;
|
|
|
|
goto err_alloc_cables;
|
|
}
|
|
strcpy(str, buf);
|
|
|
|
cable->edev = edev;
|
|
cable->cable_index = index;
|
|
cable->attrs[0] = &cable->attr_name.attr;
|
|
cable->attrs[1] = &cable->attr_state.attr;
|
|
cable->attrs[2] = NULL;
|
|
cable->attr_g.name = str;
|
|
cable->attr_g.attrs = cable->attrs;
|
|
|
|
sysfs_attr_init(&cable->attr_name.attr);
|
|
cable->attr_name.attr.name = "name";
|
|
cable->attr_name.attr.mode = 0444;
|
|
cable->attr_name.show = cable_name_show;
|
|
|
|
sysfs_attr_init(&cable->attr_state.attr);
|
|
cable->attr_state.attr.name = "state";
|
|
cable->attr_state.attr.mode = 0444;
|
|
cable->attr_state.show = cable_state_show;
|
|
}
|
|
}
|
|
|
|
if (edev->max_supported && edev->mutually_exclusive) {
|
|
char buf[80];
|
|
char *name;
|
|
|
|
/* Count the size of mutually_exclusive array */
|
|
for (index = 0; edev->mutually_exclusive[index]; index++)
|
|
;
|
|
|
|
edev->attrs_muex = kzalloc(sizeof(struct attribute *) *
|
|
(index + 1), GFP_KERNEL);
|
|
if (!edev->attrs_muex) {
|
|
ret = -ENOMEM;
|
|
goto err_muex;
|
|
}
|
|
|
|
edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) *
|
|
index, GFP_KERNEL);
|
|
if (!edev->d_attrs_muex) {
|
|
ret = -ENOMEM;
|
|
kfree(edev->attrs_muex);
|
|
goto err_muex;
|
|
}
|
|
|
|
for (index = 0; edev->mutually_exclusive[index]; index++) {
|
|
sprintf(buf, "0x%x", edev->mutually_exclusive[index]);
|
|
name = kzalloc(sizeof(char) * (strlen(buf) + 1),
|
|
GFP_KERNEL);
|
|
if (!name) {
|
|
for (index--; index >= 0; index--) {
|
|
kfree(edev->d_attrs_muex[index].attr.
|
|
name);
|
|
}
|
|
kfree(edev->d_attrs_muex);
|
|
kfree(edev->attrs_muex);
|
|
ret = -ENOMEM;
|
|
goto err_muex;
|
|
}
|
|
strcpy(name, buf);
|
|
sysfs_attr_init(&edev->d_attrs_muex[index].attr);
|
|
edev->d_attrs_muex[index].attr.name = name;
|
|
edev->d_attrs_muex[index].attr.mode = 0000;
|
|
edev->attrs_muex[index] = &edev->d_attrs_muex[index]
|
|
.attr;
|
|
}
|
|
edev->attr_g_muex.name = muex_name;
|
|
edev->attr_g_muex.attrs = edev->attrs_muex;
|
|
|
|
}
|
|
|
|
if (edev->max_supported) {
|
|
edev->extcon_dev_type.groups =
|
|
kzalloc(sizeof(struct attribute_group *) *
|
|
(edev->max_supported + 2), GFP_KERNEL);
|
|
if (!edev->extcon_dev_type.groups) {
|
|
ret = -ENOMEM;
|
|
goto err_alloc_groups;
|
|
}
|
|
|
|
edev->extcon_dev_type.name = dev_name(&edev->dev);
|
|
edev->extcon_dev_type.release = dummy_sysfs_dev_release;
|
|
|
|
for (index = 0; index < edev->max_supported; index++)
|
|
edev->extcon_dev_type.groups[index] =
|
|
&edev->cables[index].attr_g;
|
|
if (edev->mutually_exclusive)
|
|
edev->extcon_dev_type.groups[index] =
|
|
&edev->attr_g_muex;
|
|
|
|
edev->dev.type = &edev->extcon_dev_type;
|
|
}
|
|
|
|
ret = device_register(&edev->dev);
|
|
if (ret) {
|
|
put_device(&edev->dev);
|
|
goto err_dev;
|
|
}
|
|
#if defined(CONFIG_ANDROID)
|
|
if (switch_class)
|
|
ret = class_compat_create_link(switch_class, &edev->dev, NULL);
|
|
#endif /* CONFIG_ANDROID */
|
|
|
|
spin_lock_init(&edev->lock);
|
|
|
|
RAW_INIT_NOTIFIER_HEAD(&edev->nh);
|
|
|
|
dev_set_drvdata(&edev->dev, edev);
|
|
edev->state = 0;
|
|
|
|
mutex_lock(&extcon_dev_list_lock);
|
|
list_add(&edev->entry, &extcon_dev_list);
|
|
mutex_unlock(&extcon_dev_list_lock);
|
|
|
|
return 0;
|
|
|
|
err_dev:
|
|
if (edev->max_supported)
|
|
kfree(edev->extcon_dev_type.groups);
|
|
err_alloc_groups:
|
|
if (edev->max_supported && edev->mutually_exclusive) {
|
|
for (index = 0; edev->mutually_exclusive[index]; index++)
|
|
kfree(edev->d_attrs_muex[index].attr.name);
|
|
kfree(edev->d_attrs_muex);
|
|
kfree(edev->attrs_muex);
|
|
}
|
|
err_muex:
|
|
for (index = 0; index < edev->max_supported; index++)
|
|
kfree(edev->cables[index].attr_g.name);
|
|
err_alloc_cables:
|
|
if (edev->max_supported)
|
|
kfree(edev->cables);
|
|
err_sysfs_alloc:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(extcon_dev_register);
|
|
|
|
/**
|
|
* extcon_dev_unregister() - Unregister the extcon device.
|
|
* @edev: the extcon device instance to be unregistered.
|
|
*
|
|
* Note that this does not call kfree(edev) because edev was not allocated
|
|
* by this class.
|
|
*/
|
|
void extcon_dev_unregister(struct extcon_dev *edev)
|
|
{
|
|
int index;
|
|
|
|
mutex_lock(&extcon_dev_list_lock);
|
|
list_del(&edev->entry);
|
|
mutex_unlock(&extcon_dev_list_lock);
|
|
|
|
if (IS_ERR_OR_NULL(get_device(&edev->dev))) {
|
|
dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n",
|
|
dev_name(&edev->dev));
|
|
return;
|
|
}
|
|
|
|
device_unregister(&edev->dev);
|
|
|
|
if (edev->mutually_exclusive && edev->max_supported) {
|
|
for (index = 0; edev->mutually_exclusive[index];
|
|
index++)
|
|
kfree(edev->d_attrs_muex[index].attr.name);
|
|
kfree(edev->d_attrs_muex);
|
|
kfree(edev->attrs_muex);
|
|
}
|
|
|
|
for (index = 0; index < edev->max_supported; index++)
|
|
kfree(edev->cables[index].attr_g.name);
|
|
|
|
if (edev->max_supported) {
|
|
kfree(edev->extcon_dev_type.groups);
|
|
kfree(edev->cables);
|
|
}
|
|
|
|
#if defined(CONFIG_ANDROID)
|
|
if (switch_class)
|
|
class_compat_remove_link(switch_class, &edev->dev, NULL);
|
|
#endif
|
|
put_device(&edev->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(extcon_dev_unregister);
|
|
|
|
static int __init extcon_class_init(void)
|
|
{
|
|
return create_extcon_class();
|
|
}
|
|
module_init(extcon_class_init);
|
|
|
|
static void __exit extcon_class_exit(void)
|
|
{
|
|
#if defined(CONFIG_ANDROID)
|
|
class_compat_unregister(switch_class);
|
|
#endif
|
|
class_destroy(extcon_class);
|
|
}
|
|
module_exit(extcon_class_exit);
|
|
|
|
MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>");
|
|
MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
|
|
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
|
|
MODULE_DESCRIPTION("External connector (extcon) class driver");
|
|
MODULE_LICENSE("GPL");
|