1f68a8342SChanwoo Choi /* 2b9ec23c0SChanwoo Choi * drivers/extcon/extcon.c - External Connector (extcon) framework. 3f68a8342SChanwoo Choi * 4f68a8342SChanwoo Choi * External connector (extcon) class driver 5f68a8342SChanwoo Choi * 62a9de9c0SChanwoo Choi * Copyright (C) 2015 Samsung Electronics 72a9de9c0SChanwoo Choi * Author: Chanwoo Choi <cw00.choi@samsung.com> 82a9de9c0SChanwoo Choi * 9f68a8342SChanwoo Choi * Copyright (C) 2012 Samsung Electronics 10f68a8342SChanwoo Choi * Author: Donggeun Kim <dg77.kim@samsung.com> 11f68a8342SChanwoo Choi * Author: MyungJoo Ham <myungjoo.ham@samsung.com> 12f68a8342SChanwoo Choi * 13f68a8342SChanwoo Choi * based on android/drivers/switch/switch_class.c 14f68a8342SChanwoo Choi * Copyright (C) 2008 Google, Inc. 15f68a8342SChanwoo Choi * Author: Mike Lockwood <lockwood@android.com> 16f68a8342SChanwoo Choi * 17f68a8342SChanwoo Choi * This software is licensed under the terms of the GNU General Public 18f68a8342SChanwoo Choi * License version 2, as published by the Free Software Foundation, and 19f68a8342SChanwoo Choi * may be copied, distributed, and modified under those terms. 20f68a8342SChanwoo Choi * 21f68a8342SChanwoo Choi * This program is distributed in the hope that it will be useful, 22f68a8342SChanwoo Choi * but WITHOUT ANY WARRANTY; without even the implied warranty of 23f68a8342SChanwoo Choi * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 24f68a8342SChanwoo Choi * GNU General Public License for more details. 25f68a8342SChanwoo Choi */ 26f68a8342SChanwoo Choi 27f68a8342SChanwoo Choi #include <linux/module.h> 28f68a8342SChanwoo Choi #include <linux/types.h> 29f68a8342SChanwoo Choi #include <linux/init.h> 30f68a8342SChanwoo Choi #include <linux/device.h> 31f68a8342SChanwoo Choi #include <linux/fs.h> 32f68a8342SChanwoo Choi #include <linux/err.h> 33f68a8342SChanwoo Choi #include <linux/extcon.h> 34f68a8342SChanwoo Choi #include <linux/of.h> 35f68a8342SChanwoo Choi #include <linux/slab.h> 36f68a8342SChanwoo Choi #include <linux/sysfs.h> 37f68a8342SChanwoo Choi 382a9de9c0SChanwoo Choi #define SUPPORTED_CABLE_MAX 32 392a9de9c0SChanwoo Choi #define CABLE_NAME_MAX 30 402a9de9c0SChanwoo Choi 412a9de9c0SChanwoo Choi static const char *extcon_name[] = { 4273b6ecdbSChanwoo Choi [EXTCON_NONE] = "NONE", 4373b6ecdbSChanwoo Choi 448e9bc36dSChanwoo Choi /* USB external connector */ 45f68a8342SChanwoo Choi [EXTCON_USB] = "USB", 468e9bc36dSChanwoo Choi [EXTCON_USB_HOST] = "USB-HOST", 478e9bc36dSChanwoo Choi 488e9bc36dSChanwoo Choi /* Charger external connector */ 49f68a8342SChanwoo Choi [EXTCON_TA] = "TA", 508e9bc36dSChanwoo Choi [EXTCON_FAST_CHARGER] = "FAST-CHARGER", 518e9bc36dSChanwoo Choi [EXTCON_SLOW_CHARGER] = "SLOW-CHARGER", 528e9bc36dSChanwoo Choi [EXTCON_CHARGE_DOWNSTREAM] = "CHARGE-DOWNSTREAM", 538e9bc36dSChanwoo Choi 548e9bc36dSChanwoo Choi /* Audio/Video external connector */ 558e9bc36dSChanwoo Choi [EXTCON_LINE_IN] = "LINE-IN", 568e9bc36dSChanwoo Choi [EXTCON_LINE_OUT] = "LINE-OUT", 578e9bc36dSChanwoo Choi [EXTCON_MICROPHONE] = "MICROPHONE", 588e9bc36dSChanwoo Choi [EXTCON_HEADPHONE] = "HEADPHONE", 598e9bc36dSChanwoo Choi 60f68a8342SChanwoo Choi [EXTCON_HDMI] = "HDMI", 61f68a8342SChanwoo Choi [EXTCON_MHL] = "MHL", 62f68a8342SChanwoo Choi [EXTCON_DVI] = "DVI", 63f68a8342SChanwoo Choi [EXTCON_VGA] = "VGA", 648e9bc36dSChanwoo Choi [EXTCON_SPDIF_IN] = "SPDIF-IN", 658e9bc36dSChanwoo Choi [EXTCON_SPDIF_OUT] = "SPDIF-OUT", 668e9bc36dSChanwoo Choi [EXTCON_VIDEO_IN] = "VIDEO-IN", 678e9bc36dSChanwoo Choi [EXTCON_VIDEO_OUT] = "VIDEO-OUT", 688e9bc36dSChanwoo Choi 698e9bc36dSChanwoo Choi /* Etc external connector */ 708e9bc36dSChanwoo Choi [EXTCON_DOCK] = "DOCK", 712a9de9c0SChanwoo Choi [EXTCON_JIG] = "JIG", 728e9bc36dSChanwoo Choi [EXTCON_MECHANICAL] = "MECHANICAL", 738e9bc36dSChanwoo Choi 742a9de9c0SChanwoo Choi NULL, 75f68a8342SChanwoo Choi }; 76f68a8342SChanwoo Choi 77f68a8342SChanwoo Choi static struct class *extcon_class; 78f68a8342SChanwoo Choi #if defined(CONFIG_ANDROID) 79f68a8342SChanwoo Choi static struct class_compat *switch_class; 80f68a8342SChanwoo Choi #endif /* CONFIG_ANDROID */ 81f68a8342SChanwoo Choi 82f68a8342SChanwoo Choi static LIST_HEAD(extcon_dev_list); 83f68a8342SChanwoo Choi static DEFINE_MUTEX(extcon_dev_list_lock); 84f68a8342SChanwoo Choi 85f68a8342SChanwoo Choi /** 86f68a8342SChanwoo Choi * check_mutually_exclusive - Check if new_state violates mutually_exclusive 87f68a8342SChanwoo Choi * condition. 88f68a8342SChanwoo Choi * @edev: the extcon device 89f68a8342SChanwoo Choi * @new_state: new cable attach status for @edev 90f68a8342SChanwoo Choi * 91f68a8342SChanwoo Choi * Returns 0 if nothing violates. Returns the index + 1 for the first 92f68a8342SChanwoo Choi * violated condition. 93f68a8342SChanwoo Choi */ 94f68a8342SChanwoo Choi static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state) 95f68a8342SChanwoo Choi { 96f68a8342SChanwoo Choi int i = 0; 97f68a8342SChanwoo Choi 98f68a8342SChanwoo Choi if (!edev->mutually_exclusive) 99f68a8342SChanwoo Choi return 0; 100f68a8342SChanwoo Choi 101f68a8342SChanwoo Choi for (i = 0; edev->mutually_exclusive[i]; i++) { 102f68a8342SChanwoo Choi int weight; 103f68a8342SChanwoo Choi u32 correspondants = new_state & edev->mutually_exclusive[i]; 104f68a8342SChanwoo Choi 105f68a8342SChanwoo Choi /* calculate the total number of bits set */ 106f68a8342SChanwoo Choi weight = hweight32(correspondants); 107f68a8342SChanwoo Choi if (weight > 1) 108f68a8342SChanwoo Choi return i + 1; 109f68a8342SChanwoo Choi } 110f68a8342SChanwoo Choi 111f68a8342SChanwoo Choi return 0; 112f68a8342SChanwoo Choi } 113f68a8342SChanwoo Choi 11473b6ecdbSChanwoo Choi static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id) 1152a9de9c0SChanwoo Choi { 1162a9de9c0SChanwoo Choi int i; 1172a9de9c0SChanwoo Choi 1182a9de9c0SChanwoo Choi /* Find the the index of extcon cable in edev->supported_cable */ 1192a9de9c0SChanwoo Choi for (i = 0; i < edev->max_supported; i++) { 1202a9de9c0SChanwoo Choi if (edev->supported_cable[i] == id) 1212a9de9c0SChanwoo Choi return i; 1222a9de9c0SChanwoo Choi } 1232a9de9c0SChanwoo Choi 1242a9de9c0SChanwoo Choi return -EINVAL; 1252a9de9c0SChanwoo Choi } 1262a9de9c0SChanwoo Choi 127be052cc8SRoger Quadros static int find_cable_id_by_name(struct extcon_dev *edev, const char *name) 1282a9de9c0SChanwoo Choi { 129be052cc8SRoger Quadros unsigned int id = -EINVAL; 13073b6ecdbSChanwoo Choi int i = 0; 1312a9de9c0SChanwoo Choi 132be052cc8SRoger Quadros /* Find the id of extcon cable */ 13373b6ecdbSChanwoo Choi while (extcon_name[i]) { 1342a9de9c0SChanwoo Choi if (!strncmp(extcon_name[i], name, CABLE_NAME_MAX)) { 1352a9de9c0SChanwoo Choi id = i; 1362a9de9c0SChanwoo Choi break; 1372a9de9c0SChanwoo Choi } 138be052cc8SRoger Quadros i++; 1392a9de9c0SChanwoo Choi } 1402a9de9c0SChanwoo Choi 141be052cc8SRoger Quadros return id; 142be052cc8SRoger Quadros } 143be052cc8SRoger Quadros 144be052cc8SRoger Quadros static int find_cable_index_by_name(struct extcon_dev *edev, const char *name) 145be052cc8SRoger Quadros { 146be052cc8SRoger Quadros unsigned int id; 147be052cc8SRoger Quadros 148be052cc8SRoger Quadros if (edev->max_supported == 0) 1492a9de9c0SChanwoo Choi return -EINVAL; 1502a9de9c0SChanwoo Choi 151be052cc8SRoger Quadros /* Find the the number of extcon cable */ 152be052cc8SRoger Quadros id = find_cable_id_by_name(edev, name); 153be052cc8SRoger Quadros if (id < 0) 154be052cc8SRoger Quadros return id; 155be052cc8SRoger Quadros 1562a9de9c0SChanwoo Choi return find_cable_index_by_id(edev, id); 1572a9de9c0SChanwoo Choi } 1582a9de9c0SChanwoo Choi 159046050f6SChanwoo Choi static bool is_extcon_changed(u32 prev, u32 new, int idx, bool *attached) 160046050f6SChanwoo Choi { 161046050f6SChanwoo Choi if (((prev >> idx) & 0x1) != ((new >> idx) & 0x1)) { 162046050f6SChanwoo Choi *attached = new ? true : false; 163046050f6SChanwoo Choi return true; 164046050f6SChanwoo Choi } 165046050f6SChanwoo Choi 166046050f6SChanwoo Choi return false; 167046050f6SChanwoo Choi } 168046050f6SChanwoo Choi 169f68a8342SChanwoo Choi static ssize_t state_show(struct device *dev, struct device_attribute *attr, 170f68a8342SChanwoo Choi char *buf) 171f68a8342SChanwoo Choi { 172f68a8342SChanwoo Choi int i, count = 0; 173f68a8342SChanwoo Choi struct extcon_dev *edev = dev_get_drvdata(dev); 174f68a8342SChanwoo Choi 175f68a8342SChanwoo Choi if (edev->print_state) { 176f68a8342SChanwoo Choi int ret = edev->print_state(edev, buf); 177f68a8342SChanwoo Choi 178f68a8342SChanwoo Choi if (ret >= 0) 179f68a8342SChanwoo Choi return ret; 180f68a8342SChanwoo Choi /* Use default if failed */ 181f68a8342SChanwoo Choi } 182f68a8342SChanwoo Choi 183f68a8342SChanwoo Choi if (edev->max_supported == 0) 184f68a8342SChanwoo Choi return sprintf(buf, "%u\n", edev->state); 185f68a8342SChanwoo Choi 1862a9de9c0SChanwoo Choi for (i = 0; i < edev->max_supported; i++) { 187f68a8342SChanwoo Choi count += sprintf(buf + count, "%s=%d\n", 1882a9de9c0SChanwoo Choi extcon_name[edev->supported_cable[i]], 189f68a8342SChanwoo Choi !!(edev->state & (1 << i))); 190f68a8342SChanwoo Choi } 191f68a8342SChanwoo Choi 192f68a8342SChanwoo Choi return count; 193f68a8342SChanwoo Choi } 194f68a8342SChanwoo Choi 195f68a8342SChanwoo Choi static ssize_t state_store(struct device *dev, struct device_attribute *attr, 196f68a8342SChanwoo Choi const char *buf, size_t count) 197f68a8342SChanwoo Choi { 198f68a8342SChanwoo Choi u32 state; 199f68a8342SChanwoo Choi ssize_t ret = 0; 200f68a8342SChanwoo Choi struct extcon_dev *edev = dev_get_drvdata(dev); 201f68a8342SChanwoo Choi 202f68a8342SChanwoo Choi ret = sscanf(buf, "0x%x", &state); 203f68a8342SChanwoo Choi if (ret == 0) 204f68a8342SChanwoo Choi ret = -EINVAL; 205f68a8342SChanwoo Choi else 206f68a8342SChanwoo Choi ret = extcon_set_state(edev, state); 207f68a8342SChanwoo Choi 208f68a8342SChanwoo Choi if (ret < 0) 209f68a8342SChanwoo Choi return ret; 210f68a8342SChanwoo Choi 211f68a8342SChanwoo Choi return count; 212f68a8342SChanwoo Choi } 213f68a8342SChanwoo Choi static DEVICE_ATTR_RW(state); 214f68a8342SChanwoo Choi 215f68a8342SChanwoo Choi static ssize_t name_show(struct device *dev, struct device_attribute *attr, 216f68a8342SChanwoo Choi char *buf) 217f68a8342SChanwoo Choi { 218f68a8342SChanwoo Choi struct extcon_dev *edev = dev_get_drvdata(dev); 219f68a8342SChanwoo Choi 22071c3ffa5SChanwoo Choi return sprintf(buf, "%s\n", edev->name); 221f68a8342SChanwoo Choi } 222f68a8342SChanwoo Choi static DEVICE_ATTR_RO(name); 223f68a8342SChanwoo Choi 224f68a8342SChanwoo Choi static ssize_t cable_name_show(struct device *dev, 225f68a8342SChanwoo Choi struct device_attribute *attr, char *buf) 226f68a8342SChanwoo Choi { 227f68a8342SChanwoo Choi struct extcon_cable *cable = container_of(attr, struct extcon_cable, 228f68a8342SChanwoo Choi attr_name); 2292a9de9c0SChanwoo Choi int i = cable->cable_index; 230f68a8342SChanwoo Choi 231f68a8342SChanwoo Choi return sprintf(buf, "%s\n", 2322a9de9c0SChanwoo Choi extcon_name[cable->edev->supported_cable[i]]); 233f68a8342SChanwoo Choi } 234f68a8342SChanwoo Choi 235f68a8342SChanwoo Choi static ssize_t cable_state_show(struct device *dev, 236f68a8342SChanwoo Choi struct device_attribute *attr, char *buf) 237f68a8342SChanwoo Choi { 238f68a8342SChanwoo Choi struct extcon_cable *cable = container_of(attr, struct extcon_cable, 239f68a8342SChanwoo Choi attr_state); 240f68a8342SChanwoo Choi 241be052cc8SRoger Quadros int i = cable->cable_index; 242be052cc8SRoger Quadros 243f68a8342SChanwoo Choi return sprintf(buf, "%d\n", 244f68a8342SChanwoo Choi extcon_get_cable_state_(cable->edev, 245be052cc8SRoger Quadros cable->edev->supported_cable[i])); 246f68a8342SChanwoo Choi } 247f68a8342SChanwoo Choi 248f68a8342SChanwoo Choi /** 249f68a8342SChanwoo Choi * extcon_update_state() - Update the cable attach states of the extcon device 250f68a8342SChanwoo Choi * only for the masked bits. 251f68a8342SChanwoo Choi * @edev: the extcon device 252f68a8342SChanwoo Choi * @mask: the bit mask to designate updated bits. 253f68a8342SChanwoo Choi * @state: new cable attach status for @edev 254f68a8342SChanwoo Choi * 255f68a8342SChanwoo Choi * Changing the state sends uevent with environment variable containing 256f68a8342SChanwoo Choi * the name of extcon device (envp[0]) and the state output (envp[1]). 257f68a8342SChanwoo Choi * Tizen uses this format for extcon device to get events from ports. 258f68a8342SChanwoo Choi * Android uses this format as well. 259f68a8342SChanwoo Choi * 260f68a8342SChanwoo Choi * Note that the notifier provides which bits are changed in the state 261f68a8342SChanwoo Choi * variable with the val parameter (second) to the callback. 262f68a8342SChanwoo Choi */ 263f68a8342SChanwoo Choi int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state) 264f68a8342SChanwoo Choi { 265f68a8342SChanwoo Choi char name_buf[120]; 266f68a8342SChanwoo Choi char state_buf[120]; 267f68a8342SChanwoo Choi char *prop_buf; 268f68a8342SChanwoo Choi char *envp[3]; 269f68a8342SChanwoo Choi int env_offset = 0; 270f68a8342SChanwoo Choi int length; 271046050f6SChanwoo Choi int index; 272f68a8342SChanwoo Choi unsigned long flags; 273046050f6SChanwoo Choi bool attached; 274f68a8342SChanwoo Choi 275f68a8342SChanwoo Choi spin_lock_irqsave(&edev->lock, flags); 276f68a8342SChanwoo Choi 277f68a8342SChanwoo Choi if (edev->state != ((edev->state & ~mask) | (state & mask))) { 278f7a89811SRoger Quadros u32 old_state; 279f7a89811SRoger Quadros 280f68a8342SChanwoo Choi if (check_mutually_exclusive(edev, (edev->state & ~mask) | 281f68a8342SChanwoo Choi (state & mask))) { 282f68a8342SChanwoo Choi spin_unlock_irqrestore(&edev->lock, flags); 283f68a8342SChanwoo Choi return -EPERM; 284f68a8342SChanwoo Choi } 285f68a8342SChanwoo Choi 286f7a89811SRoger Quadros old_state = edev->state; 287f68a8342SChanwoo Choi edev->state &= ~mask; 288f68a8342SChanwoo Choi edev->state |= state & mask; 289f68a8342SChanwoo Choi 290f7a89811SRoger Quadros for (index = 0; index < edev->max_supported; index++) { 291f7a89811SRoger Quadros if (is_extcon_changed(old_state, edev->state, index, 292f7a89811SRoger Quadros &attached)) 293f7a89811SRoger Quadros raw_notifier_call_chain(&edev->nh[index], 294f7a89811SRoger Quadros attached, edev); 295f7a89811SRoger Quadros } 296f7a89811SRoger Quadros 297f68a8342SChanwoo Choi /* This could be in interrupt handler */ 298f68a8342SChanwoo Choi prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); 299f68a8342SChanwoo Choi if (prop_buf) { 300f68a8342SChanwoo Choi length = name_show(&edev->dev, NULL, prop_buf); 301f68a8342SChanwoo Choi if (length > 0) { 302f68a8342SChanwoo Choi if (prop_buf[length - 1] == '\n') 303f68a8342SChanwoo Choi prop_buf[length - 1] = 0; 304f68a8342SChanwoo Choi snprintf(name_buf, sizeof(name_buf), 305f68a8342SChanwoo Choi "NAME=%s", prop_buf); 306f68a8342SChanwoo Choi envp[env_offset++] = name_buf; 307f68a8342SChanwoo Choi } 308f68a8342SChanwoo Choi length = state_show(&edev->dev, NULL, prop_buf); 309f68a8342SChanwoo Choi if (length > 0) { 310f68a8342SChanwoo Choi if (prop_buf[length - 1] == '\n') 311f68a8342SChanwoo Choi prop_buf[length - 1] = 0; 312f68a8342SChanwoo Choi snprintf(state_buf, sizeof(state_buf), 313f68a8342SChanwoo Choi "STATE=%s", prop_buf); 314f68a8342SChanwoo Choi envp[env_offset++] = state_buf; 315f68a8342SChanwoo Choi } 316f68a8342SChanwoo Choi envp[env_offset] = NULL; 317f68a8342SChanwoo Choi /* Unlock early before uevent */ 318f68a8342SChanwoo Choi spin_unlock_irqrestore(&edev->lock, flags); 319f68a8342SChanwoo Choi 320f68a8342SChanwoo Choi kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp); 321f68a8342SChanwoo Choi free_page((unsigned long)prop_buf); 322f68a8342SChanwoo Choi } else { 323f68a8342SChanwoo Choi /* Unlock early before uevent */ 324f68a8342SChanwoo Choi spin_unlock_irqrestore(&edev->lock, flags); 325f68a8342SChanwoo Choi 326f68a8342SChanwoo Choi dev_err(&edev->dev, "out of memory in extcon_set_state\n"); 327f68a8342SChanwoo Choi kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE); 328f68a8342SChanwoo Choi } 329f68a8342SChanwoo Choi } else { 330f68a8342SChanwoo Choi /* No changes */ 331f68a8342SChanwoo Choi spin_unlock_irqrestore(&edev->lock, flags); 332f68a8342SChanwoo Choi } 333f68a8342SChanwoo Choi 334f68a8342SChanwoo Choi return 0; 335f68a8342SChanwoo Choi } 336f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_update_state); 337f68a8342SChanwoo Choi 338f68a8342SChanwoo Choi /** 339f68a8342SChanwoo Choi * extcon_set_state() - Set the cable attach states of the extcon device. 340f68a8342SChanwoo Choi * @edev: the extcon device 341f68a8342SChanwoo Choi * @state: new cable attach status for @edev 342f68a8342SChanwoo Choi * 343f68a8342SChanwoo Choi * Note that notifier provides which bits are changed in the state 344f68a8342SChanwoo Choi * variable with the val parameter (second) to the callback. 345f68a8342SChanwoo Choi */ 346f68a8342SChanwoo Choi int extcon_set_state(struct extcon_dev *edev, u32 state) 347f68a8342SChanwoo Choi { 348f68a8342SChanwoo Choi return extcon_update_state(edev, 0xffffffff, state); 349f68a8342SChanwoo Choi } 350f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_set_state); 351f68a8342SChanwoo Choi 352f68a8342SChanwoo Choi /** 353f68a8342SChanwoo Choi * extcon_get_cable_state_() - Get the status of a specific cable. 354f68a8342SChanwoo Choi * @edev: the extcon device that has the cable. 3552a9de9c0SChanwoo Choi * @id: the unique id of each external connector in extcon enumeration. 356f68a8342SChanwoo Choi */ 35773b6ecdbSChanwoo Choi int extcon_get_cable_state_(struct extcon_dev *edev, const unsigned int id) 358f68a8342SChanwoo Choi { 3592a9de9c0SChanwoo Choi int index; 3602a9de9c0SChanwoo Choi 3612a9de9c0SChanwoo Choi index = find_cable_index_by_id(edev, id); 3622a9de9c0SChanwoo Choi if (index < 0) 3632a9de9c0SChanwoo Choi return index; 3642a9de9c0SChanwoo Choi 3652a9de9c0SChanwoo Choi if (edev->max_supported && edev->max_supported <= index) 366f68a8342SChanwoo Choi return -EINVAL; 367f68a8342SChanwoo Choi 368f68a8342SChanwoo Choi return !!(edev->state & (1 << index)); 369f68a8342SChanwoo Choi } 370f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_get_cable_state_); 371f68a8342SChanwoo Choi 372f68a8342SChanwoo Choi /** 373f68a8342SChanwoo Choi * extcon_get_cable_state() - Get the status of a specific cable. 374f68a8342SChanwoo Choi * @edev: the extcon device that has the cable. 375f68a8342SChanwoo Choi * @cable_name: cable name. 376f68a8342SChanwoo Choi * 377f68a8342SChanwoo Choi * Note that this is slower than extcon_get_cable_state_. 378f68a8342SChanwoo Choi */ 379f68a8342SChanwoo Choi int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name) 380f68a8342SChanwoo Choi { 381be052cc8SRoger Quadros unsigned int id; 382be052cc8SRoger Quadros 383be052cc8SRoger Quadros id = find_cable_id_by_name(edev, cable_name); 384be052cc8SRoger Quadros if (id < 0) 385be052cc8SRoger Quadros return id; 386be052cc8SRoger Quadros 387be052cc8SRoger Quadros return extcon_get_cable_state_(edev, id); 388f68a8342SChanwoo Choi } 389f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_get_cable_state); 390f68a8342SChanwoo Choi 391f68a8342SChanwoo Choi /** 392f68a8342SChanwoo Choi * extcon_set_cable_state_() - Set the status of a specific cable. 393f68a8342SChanwoo Choi * @edev: the extcon device that has the cable. 3942a9de9c0SChanwoo Choi * @id: the unique id of each external connector 3952a9de9c0SChanwoo Choi * in extcon enumeration. 3962a9de9c0SChanwoo Choi * @state: the new cable status. The default semantics is 397f68a8342SChanwoo Choi * true: attached / false: detached. 398f68a8342SChanwoo Choi */ 39973b6ecdbSChanwoo Choi int extcon_set_cable_state_(struct extcon_dev *edev, unsigned int id, 4002a9de9c0SChanwoo Choi bool cable_state) 401f68a8342SChanwoo Choi { 402f68a8342SChanwoo Choi u32 state; 4032a9de9c0SChanwoo Choi int index; 404f68a8342SChanwoo Choi 4052a9de9c0SChanwoo Choi index = find_cable_index_by_id(edev, id); 4062a9de9c0SChanwoo Choi if (index < 0) 4072a9de9c0SChanwoo Choi return index; 4082a9de9c0SChanwoo Choi 4092a9de9c0SChanwoo Choi if (edev->max_supported && edev->max_supported <= index) 410f68a8342SChanwoo Choi return -EINVAL; 411f68a8342SChanwoo Choi 412f68a8342SChanwoo Choi state = cable_state ? (1 << index) : 0; 413f68a8342SChanwoo Choi return extcon_update_state(edev, 1 << index, state); 414f68a8342SChanwoo Choi } 415f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_set_cable_state_); 416f68a8342SChanwoo Choi 417f68a8342SChanwoo Choi /** 418f68a8342SChanwoo Choi * extcon_set_cable_state() - Set the status of a specific cable. 419f68a8342SChanwoo Choi * @edev: the extcon device that has the cable. 420f68a8342SChanwoo Choi * @cable_name: cable name. 421f68a8342SChanwoo Choi * @cable_state: the new cable status. The default semantics is 422f68a8342SChanwoo Choi * true: attached / false: detached. 423f68a8342SChanwoo Choi * 424f68a8342SChanwoo Choi * Note that this is slower than extcon_set_cable_state_. 425f68a8342SChanwoo Choi */ 426f68a8342SChanwoo Choi int extcon_set_cable_state(struct extcon_dev *edev, 427f68a8342SChanwoo Choi const char *cable_name, bool cable_state) 428f68a8342SChanwoo Choi { 429be052cc8SRoger Quadros unsigned int id; 430be052cc8SRoger Quadros 431be052cc8SRoger Quadros id = find_cable_id_by_name(edev, cable_name); 432be052cc8SRoger Quadros if (id < 0) 433be052cc8SRoger Quadros return id; 434be052cc8SRoger Quadros 435be052cc8SRoger Quadros return extcon_set_cable_state_(edev, id, cable_state); 436f68a8342SChanwoo Choi } 437f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_set_cable_state); 438f68a8342SChanwoo Choi 439f68a8342SChanwoo Choi /** 440f68a8342SChanwoo Choi * extcon_get_extcon_dev() - Get the extcon device instance from the name 441f68a8342SChanwoo Choi * @extcon_name: The extcon name provided with extcon_dev_register() 442f68a8342SChanwoo Choi */ 443f68a8342SChanwoo Choi struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) 444f68a8342SChanwoo Choi { 445f68a8342SChanwoo Choi struct extcon_dev *sd; 446f68a8342SChanwoo Choi 447f68a8342SChanwoo Choi mutex_lock(&extcon_dev_list_lock); 448f68a8342SChanwoo Choi list_for_each_entry(sd, &extcon_dev_list, entry) { 449f68a8342SChanwoo Choi if (!strcmp(sd->name, extcon_name)) 450f68a8342SChanwoo Choi goto out; 451f68a8342SChanwoo Choi } 452f68a8342SChanwoo Choi sd = NULL; 453f68a8342SChanwoo Choi out: 454f68a8342SChanwoo Choi mutex_unlock(&extcon_dev_list_lock); 455f68a8342SChanwoo Choi return sd; 456f68a8342SChanwoo Choi } 457f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); 458f68a8342SChanwoo Choi 459f68a8342SChanwoo Choi /** 460f68a8342SChanwoo Choi * extcon_register_interest() - Register a notifier for a state change of a 461f68a8342SChanwoo Choi * specific cable, not an entier set of cables of a 462f68a8342SChanwoo Choi * extcon device. 463f68a8342SChanwoo Choi * @obj: an empty extcon_specific_cable_nb object to be returned. 464f68a8342SChanwoo Choi * @extcon_name: the name of extcon device. 465f68a8342SChanwoo Choi * if NULL, extcon_register_interest will register 466f68a8342SChanwoo Choi * every cable with the target cable_name given. 467f68a8342SChanwoo Choi * @cable_name: the target cable name. 468f68a8342SChanwoo Choi * @nb: the notifier block to get notified. 469f68a8342SChanwoo Choi * 470f68a8342SChanwoo Choi * Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets 471f68a8342SChanwoo Choi * the struct for you. 472f68a8342SChanwoo Choi * 473f68a8342SChanwoo Choi * extcon_register_interest is a helper function for those who want to get 474f68a8342SChanwoo Choi * notification for a single specific cable's status change. If a user wants 475f68a8342SChanwoo Choi * to get notification for any changes of all cables of a extcon device, 476f68a8342SChanwoo Choi * he/she should use the general extcon_register_notifier(). 477f68a8342SChanwoo Choi * 478f68a8342SChanwoo Choi * Note that the second parameter given to the callback of nb (val) is 479f68a8342SChanwoo Choi * "old_state", not the current state. The current state can be retrieved 480f68a8342SChanwoo Choi * by looking at the third pameter (edev pointer)'s state value. 481f68a8342SChanwoo Choi */ 482f68a8342SChanwoo Choi int extcon_register_interest(struct extcon_specific_cable_nb *obj, 483f68a8342SChanwoo Choi const char *extcon_name, const char *cable_name, 484f68a8342SChanwoo Choi struct notifier_block *nb) 485f68a8342SChanwoo Choi { 48666bee35fSHans de Goede unsigned long flags; 48766bee35fSHans de Goede int ret; 48866bee35fSHans de Goede 489f68a8342SChanwoo Choi if (!obj || !cable_name || !nb) 490f68a8342SChanwoo Choi return -EINVAL; 491f68a8342SChanwoo Choi 492f68a8342SChanwoo Choi if (extcon_name) { 493f68a8342SChanwoo Choi obj->edev = extcon_get_extcon_dev(extcon_name); 494f68a8342SChanwoo Choi if (!obj->edev) 495f68a8342SChanwoo Choi return -ENODEV; 496f68a8342SChanwoo Choi 4972a9de9c0SChanwoo Choi obj->cable_index = find_cable_index_by_name(obj->edev, 498f68a8342SChanwoo Choi cable_name); 499f68a8342SChanwoo Choi if (obj->cable_index < 0) 500f68a8342SChanwoo Choi return obj->cable_index; 501f68a8342SChanwoo Choi 502f68a8342SChanwoo Choi obj->user_nb = nb; 503f68a8342SChanwoo Choi 50466bee35fSHans de Goede spin_lock_irqsave(&obj->edev->lock, flags); 505046050f6SChanwoo Choi ret = raw_notifier_chain_register( 506046050f6SChanwoo Choi &obj->edev->nh[obj->cable_index], 507046050f6SChanwoo Choi obj->user_nb); 50866bee35fSHans de Goede spin_unlock_irqrestore(&obj->edev->lock, flags); 509f68a8342SChanwoo Choi } else { 510f68a8342SChanwoo Choi struct class_dev_iter iter; 511f68a8342SChanwoo Choi struct extcon_dev *extd; 512f68a8342SChanwoo Choi struct device *dev; 513f68a8342SChanwoo Choi 514f68a8342SChanwoo Choi if (!extcon_class) 515f68a8342SChanwoo Choi return -ENODEV; 516f68a8342SChanwoo Choi class_dev_iter_init(&iter, extcon_class, NULL, NULL); 517f68a8342SChanwoo Choi while ((dev = class_dev_iter_next(&iter))) { 518f68a8342SChanwoo Choi extd = dev_get_drvdata(dev); 519f68a8342SChanwoo Choi 5202a9de9c0SChanwoo Choi if (find_cable_index_by_name(extd, cable_name) < 0) 521f68a8342SChanwoo Choi continue; 522f68a8342SChanwoo Choi 523f68a8342SChanwoo Choi class_dev_iter_exit(&iter); 524f68a8342SChanwoo Choi return extcon_register_interest(obj, extd->name, 525f68a8342SChanwoo Choi cable_name, nb); 526f68a8342SChanwoo Choi } 527f68a8342SChanwoo Choi 528b9ec23c0SChanwoo Choi ret = -ENODEV; 529f68a8342SChanwoo Choi } 530b9ec23c0SChanwoo Choi 531b9ec23c0SChanwoo Choi return ret; 532f68a8342SChanwoo Choi } 533f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_register_interest); 534f68a8342SChanwoo Choi 535f68a8342SChanwoo Choi /** 536f68a8342SChanwoo Choi * extcon_unregister_interest() - Unregister the notifier registered by 537f68a8342SChanwoo Choi * extcon_register_interest(). 538f68a8342SChanwoo Choi * @obj: the extcon_specific_cable_nb object returned by 539f68a8342SChanwoo Choi * extcon_register_interest(). 540f68a8342SChanwoo Choi */ 541f68a8342SChanwoo Choi int extcon_unregister_interest(struct extcon_specific_cable_nb *obj) 542f68a8342SChanwoo Choi { 54366bee35fSHans de Goede unsigned long flags; 54466bee35fSHans de Goede int ret; 54566bee35fSHans de Goede 546f68a8342SChanwoo Choi if (!obj) 547f68a8342SChanwoo Choi return -EINVAL; 548f68a8342SChanwoo Choi 54966bee35fSHans de Goede spin_lock_irqsave(&obj->edev->lock, flags); 550046050f6SChanwoo Choi ret = raw_notifier_chain_unregister( 551046050f6SChanwoo Choi &obj->edev->nh[obj->cable_index], obj->user_nb); 55266bee35fSHans de Goede spin_unlock_irqrestore(&obj->edev->lock, flags); 55366bee35fSHans de Goede 55466bee35fSHans de Goede return ret; 555f68a8342SChanwoo Choi } 556f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_unregister_interest); 557f68a8342SChanwoo Choi 558f68a8342SChanwoo Choi /** 559f68a8342SChanwoo Choi * extcon_register_notifier() - Register a notifiee to get notified by 560f68a8342SChanwoo Choi * any attach status changes from the extcon. 561046050f6SChanwoo Choi * @edev: the extcon device that has the external connecotr. 562046050f6SChanwoo Choi * @id: the unique id of each external connector in extcon enumeration. 563f68a8342SChanwoo Choi * @nb: a notifier block to be registered. 564f68a8342SChanwoo Choi * 565f68a8342SChanwoo Choi * Note that the second parameter given to the callback of nb (val) is 566f68a8342SChanwoo Choi * "old_state", not the current state. The current state can be retrieved 567f68a8342SChanwoo Choi * by looking at the third pameter (edev pointer)'s state value. 568f68a8342SChanwoo Choi */ 56973b6ecdbSChanwoo Choi int extcon_register_notifier(struct extcon_dev *edev, unsigned int id, 570f68a8342SChanwoo Choi struct notifier_block *nb) 571f68a8342SChanwoo Choi { 57266bee35fSHans de Goede unsigned long flags; 573046050f6SChanwoo Choi int ret, idx; 574046050f6SChanwoo Choi 575046050f6SChanwoo Choi idx = find_cable_index_by_id(edev, id); 57666bee35fSHans de Goede 57766bee35fSHans de Goede spin_lock_irqsave(&edev->lock, flags); 578046050f6SChanwoo Choi ret = raw_notifier_chain_register(&edev->nh[idx], nb); 57966bee35fSHans de Goede spin_unlock_irqrestore(&edev->lock, flags); 58066bee35fSHans de Goede 58166bee35fSHans de Goede return ret; 582f68a8342SChanwoo Choi } 583f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_register_notifier); 584f68a8342SChanwoo Choi 585f68a8342SChanwoo Choi /** 586f68a8342SChanwoo Choi * extcon_unregister_notifier() - Unregister a notifiee from the extcon device. 587046050f6SChanwoo Choi * @edev: the extcon device that has the external connecotr. 588046050f6SChanwoo Choi * @id: the unique id of each external connector in extcon enumeration. 589046050f6SChanwoo Choi * @nb: a notifier block to be registered. 590f68a8342SChanwoo Choi */ 59173b6ecdbSChanwoo Choi int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id, 592f68a8342SChanwoo Choi struct notifier_block *nb) 593f68a8342SChanwoo Choi { 59466bee35fSHans de Goede unsigned long flags; 595046050f6SChanwoo Choi int ret, idx; 596046050f6SChanwoo Choi 597046050f6SChanwoo Choi idx = find_cable_index_by_id(edev, id); 59866bee35fSHans de Goede 59966bee35fSHans de Goede spin_lock_irqsave(&edev->lock, flags); 600046050f6SChanwoo Choi ret = raw_notifier_chain_unregister(&edev->nh[idx], nb); 60166bee35fSHans de Goede spin_unlock_irqrestore(&edev->lock, flags); 60266bee35fSHans de Goede 60366bee35fSHans de Goede return ret; 604f68a8342SChanwoo Choi } 605f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_unregister_notifier); 606f68a8342SChanwoo Choi 607f68a8342SChanwoo Choi static struct attribute *extcon_attrs[] = { 608f68a8342SChanwoo Choi &dev_attr_state.attr, 609f68a8342SChanwoo Choi &dev_attr_name.attr, 610f68a8342SChanwoo Choi NULL, 611f68a8342SChanwoo Choi }; 612f68a8342SChanwoo Choi ATTRIBUTE_GROUPS(extcon); 613f68a8342SChanwoo Choi 614f68a8342SChanwoo Choi static int create_extcon_class(void) 615f68a8342SChanwoo Choi { 616f68a8342SChanwoo Choi if (!extcon_class) { 617f68a8342SChanwoo Choi extcon_class = class_create(THIS_MODULE, "extcon"); 618f68a8342SChanwoo Choi if (IS_ERR(extcon_class)) 619f68a8342SChanwoo Choi return PTR_ERR(extcon_class); 620f68a8342SChanwoo Choi extcon_class->dev_groups = extcon_groups; 621f68a8342SChanwoo Choi 622f68a8342SChanwoo Choi #if defined(CONFIG_ANDROID) 623f68a8342SChanwoo Choi switch_class = class_compat_register("switch"); 624f68a8342SChanwoo Choi if (WARN(!switch_class, "cannot allocate")) 625f68a8342SChanwoo Choi return -ENOMEM; 626f68a8342SChanwoo Choi #endif /* CONFIG_ANDROID */ 627f68a8342SChanwoo Choi } 628f68a8342SChanwoo Choi 629f68a8342SChanwoo Choi return 0; 630f68a8342SChanwoo Choi } 631f68a8342SChanwoo Choi 632f68a8342SChanwoo Choi static void extcon_dev_release(struct device *dev) 633f68a8342SChanwoo Choi { 634f68a8342SChanwoo Choi } 635f68a8342SChanwoo Choi 636f68a8342SChanwoo Choi static const char *muex_name = "mutually_exclusive"; 637f68a8342SChanwoo Choi static void dummy_sysfs_dev_release(struct device *dev) 638f68a8342SChanwoo Choi { 639f68a8342SChanwoo Choi } 640f68a8342SChanwoo Choi 641f68a8342SChanwoo Choi /* 642f68a8342SChanwoo Choi * extcon_dev_allocate() - Allocate the memory of extcon device. 6432a9de9c0SChanwoo Choi * @supported_cable: Array of supported extcon ending with EXTCON_NONE. 644f68a8342SChanwoo Choi * If supported_cable is NULL, cable name related APIs 645f68a8342SChanwoo Choi * are disabled. 646f68a8342SChanwoo Choi * 647f68a8342SChanwoo Choi * This function allocates the memory for extcon device without allocating 648f68a8342SChanwoo Choi * memory in each extcon provider driver and initialize default setting for 649f68a8342SChanwoo Choi * extcon device. 650f68a8342SChanwoo Choi * 651f68a8342SChanwoo Choi * Return the pointer of extcon device if success or ERR_PTR(err) if fail 652f68a8342SChanwoo Choi */ 65373b6ecdbSChanwoo Choi struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable) 654f68a8342SChanwoo Choi { 655f68a8342SChanwoo Choi struct extcon_dev *edev; 656f68a8342SChanwoo Choi 657f68a8342SChanwoo Choi edev = kzalloc(sizeof(*edev), GFP_KERNEL); 658f68a8342SChanwoo Choi if (!edev) 659f68a8342SChanwoo Choi return ERR_PTR(-ENOMEM); 660f68a8342SChanwoo Choi 661f68a8342SChanwoo Choi edev->max_supported = 0; 662f68a8342SChanwoo Choi edev->supported_cable = supported_cable; 663f68a8342SChanwoo Choi 664f68a8342SChanwoo Choi return edev; 665f68a8342SChanwoo Choi } 666f68a8342SChanwoo Choi 667f68a8342SChanwoo Choi /* 668f68a8342SChanwoo Choi * extcon_dev_free() - Free the memory of extcon device. 669f68a8342SChanwoo Choi * @edev: the extcon device to free 670f68a8342SChanwoo Choi */ 671f68a8342SChanwoo Choi void extcon_dev_free(struct extcon_dev *edev) 672f68a8342SChanwoo Choi { 673f68a8342SChanwoo Choi kfree(edev); 674f68a8342SChanwoo Choi } 675f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_dev_free); 676f68a8342SChanwoo Choi 677f68a8342SChanwoo Choi static int devm_extcon_dev_match(struct device *dev, void *res, void *data) 678f68a8342SChanwoo Choi { 679f68a8342SChanwoo Choi struct extcon_dev **r = res; 680f68a8342SChanwoo Choi 681f68a8342SChanwoo Choi if (WARN_ON(!r || !*r)) 682f68a8342SChanwoo Choi return 0; 683f68a8342SChanwoo Choi 684f68a8342SChanwoo Choi return *r == data; 685f68a8342SChanwoo Choi } 686f68a8342SChanwoo Choi 687f68a8342SChanwoo Choi static void devm_extcon_dev_release(struct device *dev, void *res) 688f68a8342SChanwoo Choi { 689f68a8342SChanwoo Choi extcon_dev_free(*(struct extcon_dev **)res); 690f68a8342SChanwoo Choi } 691f68a8342SChanwoo Choi 692f68a8342SChanwoo Choi /** 693f68a8342SChanwoo Choi * devm_extcon_dev_allocate - Allocate managed extcon device 694f68a8342SChanwoo Choi * @dev: device owning the extcon device being created 6952a9de9c0SChanwoo Choi * @supported_cable: Array of supported extcon ending with EXTCON_NONE. 696f68a8342SChanwoo Choi * If supported_cable is NULL, cable name related APIs 697f68a8342SChanwoo Choi * are disabled. 698f68a8342SChanwoo Choi * 699f68a8342SChanwoo Choi * This function manages automatically the memory of extcon device using device 700f68a8342SChanwoo Choi * resource management and simplify the control of freeing the memory of extcon 701f68a8342SChanwoo Choi * device. 702f68a8342SChanwoo Choi * 703f68a8342SChanwoo Choi * Returns the pointer memory of allocated extcon_dev if success 704f68a8342SChanwoo Choi * or ERR_PTR(err) if fail 705f68a8342SChanwoo Choi */ 706f68a8342SChanwoo Choi struct extcon_dev *devm_extcon_dev_allocate(struct device *dev, 70773b6ecdbSChanwoo Choi const unsigned int *supported_cable) 708f68a8342SChanwoo Choi { 709f68a8342SChanwoo Choi struct extcon_dev **ptr, *edev; 710f68a8342SChanwoo Choi 711f68a8342SChanwoo Choi ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL); 712f68a8342SChanwoo Choi if (!ptr) 713f68a8342SChanwoo Choi return ERR_PTR(-ENOMEM); 714f68a8342SChanwoo Choi 715f68a8342SChanwoo Choi edev = extcon_dev_allocate(supported_cable); 716f68a8342SChanwoo Choi if (IS_ERR(edev)) { 717f68a8342SChanwoo Choi devres_free(ptr); 718f68a8342SChanwoo Choi return edev; 719f68a8342SChanwoo Choi } 720f68a8342SChanwoo Choi 721f68a8342SChanwoo Choi edev->dev.parent = dev; 722f68a8342SChanwoo Choi 723f68a8342SChanwoo Choi *ptr = edev; 724f68a8342SChanwoo Choi devres_add(dev, ptr); 725f68a8342SChanwoo Choi 726f68a8342SChanwoo Choi return edev; 727f68a8342SChanwoo Choi } 728f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate); 729f68a8342SChanwoo Choi 730f68a8342SChanwoo Choi void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev) 731f68a8342SChanwoo Choi { 732f68a8342SChanwoo Choi WARN_ON(devres_release(dev, devm_extcon_dev_release, 733f68a8342SChanwoo Choi devm_extcon_dev_match, edev)); 734f68a8342SChanwoo Choi } 735f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(devm_extcon_dev_free); 736f68a8342SChanwoo Choi 737f68a8342SChanwoo Choi /** 738f68a8342SChanwoo Choi * extcon_dev_register() - Register a new extcon device 739f68a8342SChanwoo Choi * @edev : the new extcon device (should be allocated before calling) 740f68a8342SChanwoo Choi * 741f68a8342SChanwoo Choi * Among the members of edev struct, please set the "user initializing data" 742f68a8342SChanwoo Choi * in any case and set the "optional callbacks" if required. However, please 743f68a8342SChanwoo Choi * do not set the values of "internal data", which are initialized by 744f68a8342SChanwoo Choi * this function. 745f68a8342SChanwoo Choi */ 746f68a8342SChanwoo Choi int extcon_dev_register(struct extcon_dev *edev) 747f68a8342SChanwoo Choi { 748f68a8342SChanwoo Choi int ret, index = 0; 74971c3ffa5SChanwoo Choi static atomic_t edev_no = ATOMIC_INIT(-1); 750f68a8342SChanwoo Choi 751f68a8342SChanwoo Choi if (!extcon_class) { 752f68a8342SChanwoo Choi ret = create_extcon_class(); 753f68a8342SChanwoo Choi if (ret < 0) 754f68a8342SChanwoo Choi return ret; 755f68a8342SChanwoo Choi } 756f68a8342SChanwoo Choi 7572a9de9c0SChanwoo Choi if (!edev->supported_cable) 7582a9de9c0SChanwoo Choi return -EINVAL; 759f68a8342SChanwoo Choi 7602a9de9c0SChanwoo Choi for (; edev->supported_cable[index] != EXTCON_NONE; index++); 7612a9de9c0SChanwoo Choi 7622a9de9c0SChanwoo Choi edev->max_supported = index; 763f68a8342SChanwoo Choi if (index > SUPPORTED_CABLE_MAX) { 7642a9de9c0SChanwoo Choi dev_err(&edev->dev, 7652a9de9c0SChanwoo Choi "exceed the maximum number of supported cables\n"); 766f68a8342SChanwoo Choi return -EINVAL; 767f68a8342SChanwoo Choi } 768f68a8342SChanwoo Choi 769f68a8342SChanwoo Choi edev->dev.class = extcon_class; 770f68a8342SChanwoo Choi edev->dev.release = extcon_dev_release; 771f68a8342SChanwoo Choi 77271c3ffa5SChanwoo Choi edev->name = dev_name(edev->dev.parent); 773f68a8342SChanwoo Choi if (IS_ERR_OR_NULL(edev->name)) { 774f68a8342SChanwoo Choi dev_err(&edev->dev, 775f68a8342SChanwoo Choi "extcon device name is null\n"); 776f68a8342SChanwoo Choi return -EINVAL; 777f68a8342SChanwoo Choi } 77871c3ffa5SChanwoo Choi dev_set_name(&edev->dev, "extcon%lu", 77971c3ffa5SChanwoo Choi (unsigned long)atomic_inc_return(&edev_no)); 780f68a8342SChanwoo Choi 781f68a8342SChanwoo Choi if (edev->max_supported) { 782f68a8342SChanwoo Choi char buf[10]; 783f68a8342SChanwoo Choi char *str; 784f68a8342SChanwoo Choi struct extcon_cable *cable; 785f68a8342SChanwoo Choi 786f68a8342SChanwoo Choi edev->cables = kzalloc(sizeof(struct extcon_cable) * 787f68a8342SChanwoo Choi edev->max_supported, GFP_KERNEL); 788f68a8342SChanwoo Choi if (!edev->cables) { 789f68a8342SChanwoo Choi ret = -ENOMEM; 790f68a8342SChanwoo Choi goto err_sysfs_alloc; 791f68a8342SChanwoo Choi } 792f68a8342SChanwoo Choi for (index = 0; index < edev->max_supported; index++) { 793f68a8342SChanwoo Choi cable = &edev->cables[index]; 794f68a8342SChanwoo Choi 795f68a8342SChanwoo Choi snprintf(buf, 10, "cable.%d", index); 796f68a8342SChanwoo Choi str = kzalloc(sizeof(char) * (strlen(buf) + 1), 797f68a8342SChanwoo Choi GFP_KERNEL); 798f68a8342SChanwoo Choi if (!str) { 799f68a8342SChanwoo Choi for (index--; index >= 0; index--) { 800f68a8342SChanwoo Choi cable = &edev->cables[index]; 801f68a8342SChanwoo Choi kfree(cable->attr_g.name); 802f68a8342SChanwoo Choi } 803f68a8342SChanwoo Choi ret = -ENOMEM; 804f68a8342SChanwoo Choi 805f68a8342SChanwoo Choi goto err_alloc_cables; 806f68a8342SChanwoo Choi } 807f68a8342SChanwoo Choi strcpy(str, buf); 808f68a8342SChanwoo Choi 809f68a8342SChanwoo Choi cable->edev = edev; 810f68a8342SChanwoo Choi cable->cable_index = index; 811f68a8342SChanwoo Choi cable->attrs[0] = &cable->attr_name.attr; 812f68a8342SChanwoo Choi cable->attrs[1] = &cable->attr_state.attr; 813f68a8342SChanwoo Choi cable->attrs[2] = NULL; 814f68a8342SChanwoo Choi cable->attr_g.name = str; 815f68a8342SChanwoo Choi cable->attr_g.attrs = cable->attrs; 816f68a8342SChanwoo Choi 817f68a8342SChanwoo Choi sysfs_attr_init(&cable->attr_name.attr); 818f68a8342SChanwoo Choi cable->attr_name.attr.name = "name"; 819f68a8342SChanwoo Choi cable->attr_name.attr.mode = 0444; 820f68a8342SChanwoo Choi cable->attr_name.show = cable_name_show; 821f68a8342SChanwoo Choi 822f68a8342SChanwoo Choi sysfs_attr_init(&cable->attr_state.attr); 823f68a8342SChanwoo Choi cable->attr_state.attr.name = "state"; 824f68a8342SChanwoo Choi cable->attr_state.attr.mode = 0444; 825f68a8342SChanwoo Choi cable->attr_state.show = cable_state_show; 826f68a8342SChanwoo Choi } 827f68a8342SChanwoo Choi } 828f68a8342SChanwoo Choi 829f68a8342SChanwoo Choi if (edev->max_supported && edev->mutually_exclusive) { 830f68a8342SChanwoo Choi char buf[80]; 831f68a8342SChanwoo Choi char *name; 832f68a8342SChanwoo Choi 833f68a8342SChanwoo Choi /* Count the size of mutually_exclusive array */ 834f68a8342SChanwoo Choi for (index = 0; edev->mutually_exclusive[index]; index++) 835f68a8342SChanwoo Choi ; 836f68a8342SChanwoo Choi 837f68a8342SChanwoo Choi edev->attrs_muex = kzalloc(sizeof(struct attribute *) * 838f68a8342SChanwoo Choi (index + 1), GFP_KERNEL); 839f68a8342SChanwoo Choi if (!edev->attrs_muex) { 840f68a8342SChanwoo Choi ret = -ENOMEM; 841f68a8342SChanwoo Choi goto err_muex; 842f68a8342SChanwoo Choi } 843f68a8342SChanwoo Choi 844f68a8342SChanwoo Choi edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) * 845f68a8342SChanwoo Choi index, GFP_KERNEL); 846f68a8342SChanwoo Choi if (!edev->d_attrs_muex) { 847f68a8342SChanwoo Choi ret = -ENOMEM; 848f68a8342SChanwoo Choi kfree(edev->attrs_muex); 849f68a8342SChanwoo Choi goto err_muex; 850f68a8342SChanwoo Choi } 851f68a8342SChanwoo Choi 852f68a8342SChanwoo Choi for (index = 0; edev->mutually_exclusive[index]; index++) { 853f68a8342SChanwoo Choi sprintf(buf, "0x%x", edev->mutually_exclusive[index]); 854f68a8342SChanwoo Choi name = kzalloc(sizeof(char) * (strlen(buf) + 1), 855f68a8342SChanwoo Choi GFP_KERNEL); 856f68a8342SChanwoo Choi if (!name) { 857f68a8342SChanwoo Choi for (index--; index >= 0; index--) { 858f68a8342SChanwoo Choi kfree(edev->d_attrs_muex[index].attr. 859f68a8342SChanwoo Choi name); 860f68a8342SChanwoo Choi } 861f68a8342SChanwoo Choi kfree(edev->d_attrs_muex); 862f68a8342SChanwoo Choi kfree(edev->attrs_muex); 863f68a8342SChanwoo Choi ret = -ENOMEM; 864f68a8342SChanwoo Choi goto err_muex; 865f68a8342SChanwoo Choi } 866f68a8342SChanwoo Choi strcpy(name, buf); 867f68a8342SChanwoo Choi sysfs_attr_init(&edev->d_attrs_muex[index].attr); 868f68a8342SChanwoo Choi edev->d_attrs_muex[index].attr.name = name; 869f68a8342SChanwoo Choi edev->d_attrs_muex[index].attr.mode = 0000; 870f68a8342SChanwoo Choi edev->attrs_muex[index] = &edev->d_attrs_muex[index] 871f68a8342SChanwoo Choi .attr; 872f68a8342SChanwoo Choi } 873f68a8342SChanwoo Choi edev->attr_g_muex.name = muex_name; 874f68a8342SChanwoo Choi edev->attr_g_muex.attrs = edev->attrs_muex; 875f68a8342SChanwoo Choi 876f68a8342SChanwoo Choi } 877f68a8342SChanwoo Choi 878f68a8342SChanwoo Choi if (edev->max_supported) { 879f68a8342SChanwoo Choi edev->extcon_dev_type.groups = 880f68a8342SChanwoo Choi kzalloc(sizeof(struct attribute_group *) * 881f68a8342SChanwoo Choi (edev->max_supported + 2), GFP_KERNEL); 882f68a8342SChanwoo Choi if (!edev->extcon_dev_type.groups) { 883f68a8342SChanwoo Choi ret = -ENOMEM; 884f68a8342SChanwoo Choi goto err_alloc_groups; 885f68a8342SChanwoo Choi } 886f68a8342SChanwoo Choi 887f68a8342SChanwoo Choi edev->extcon_dev_type.name = dev_name(&edev->dev); 888f68a8342SChanwoo Choi edev->extcon_dev_type.release = dummy_sysfs_dev_release; 889f68a8342SChanwoo Choi 890f68a8342SChanwoo Choi for (index = 0; index < edev->max_supported; index++) 891f68a8342SChanwoo Choi edev->extcon_dev_type.groups[index] = 892f68a8342SChanwoo Choi &edev->cables[index].attr_g; 893f68a8342SChanwoo Choi if (edev->mutually_exclusive) 894f68a8342SChanwoo Choi edev->extcon_dev_type.groups[index] = 895f68a8342SChanwoo Choi &edev->attr_g_muex; 896f68a8342SChanwoo Choi 897f68a8342SChanwoo Choi edev->dev.type = &edev->extcon_dev_type; 898f68a8342SChanwoo Choi } 899f68a8342SChanwoo Choi 900f68a8342SChanwoo Choi ret = device_register(&edev->dev); 901f68a8342SChanwoo Choi if (ret) { 902f68a8342SChanwoo Choi put_device(&edev->dev); 903f68a8342SChanwoo Choi goto err_dev; 904f68a8342SChanwoo Choi } 905f68a8342SChanwoo Choi #if defined(CONFIG_ANDROID) 906f68a8342SChanwoo Choi if (switch_class) 907f68a8342SChanwoo Choi ret = class_compat_create_link(switch_class, &edev->dev, NULL); 908f68a8342SChanwoo Choi #endif /* CONFIG_ANDROID */ 909f68a8342SChanwoo Choi 910f68a8342SChanwoo Choi spin_lock_init(&edev->lock); 911f68a8342SChanwoo Choi 912046050f6SChanwoo Choi edev->nh = devm_kzalloc(&edev->dev, 913046050f6SChanwoo Choi sizeof(*edev->nh) * edev->max_supported, GFP_KERNEL); 914046050f6SChanwoo Choi if (!edev->nh) { 915046050f6SChanwoo Choi ret = -ENOMEM; 916046050f6SChanwoo Choi goto err_dev; 917046050f6SChanwoo Choi } 918046050f6SChanwoo Choi 919046050f6SChanwoo Choi for (index = 0; index < edev->max_supported; index++) 920046050f6SChanwoo Choi RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]); 921f68a8342SChanwoo Choi 922f68a8342SChanwoo Choi dev_set_drvdata(&edev->dev, edev); 923f68a8342SChanwoo Choi edev->state = 0; 924f68a8342SChanwoo Choi 925f68a8342SChanwoo Choi mutex_lock(&extcon_dev_list_lock); 926f68a8342SChanwoo Choi list_add(&edev->entry, &extcon_dev_list); 927f68a8342SChanwoo Choi mutex_unlock(&extcon_dev_list_lock); 928f68a8342SChanwoo Choi 929f68a8342SChanwoo Choi return 0; 930f68a8342SChanwoo Choi 931f68a8342SChanwoo Choi err_dev: 932f68a8342SChanwoo Choi if (edev->max_supported) 933f68a8342SChanwoo Choi kfree(edev->extcon_dev_type.groups); 934f68a8342SChanwoo Choi err_alloc_groups: 935f68a8342SChanwoo Choi if (edev->max_supported && edev->mutually_exclusive) { 936f68a8342SChanwoo Choi for (index = 0; edev->mutually_exclusive[index]; index++) 937f68a8342SChanwoo Choi kfree(edev->d_attrs_muex[index].attr.name); 938f68a8342SChanwoo Choi kfree(edev->d_attrs_muex); 939f68a8342SChanwoo Choi kfree(edev->attrs_muex); 940f68a8342SChanwoo Choi } 941f68a8342SChanwoo Choi err_muex: 942f68a8342SChanwoo Choi for (index = 0; index < edev->max_supported; index++) 943f68a8342SChanwoo Choi kfree(edev->cables[index].attr_g.name); 944f68a8342SChanwoo Choi err_alloc_cables: 945f68a8342SChanwoo Choi if (edev->max_supported) 946f68a8342SChanwoo Choi kfree(edev->cables); 947f68a8342SChanwoo Choi err_sysfs_alloc: 948f68a8342SChanwoo Choi return ret; 949f68a8342SChanwoo Choi } 950f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_dev_register); 951f68a8342SChanwoo Choi 952f68a8342SChanwoo Choi /** 953f68a8342SChanwoo Choi * extcon_dev_unregister() - Unregister the extcon device. 954f68a8342SChanwoo Choi * @edev: the extcon device instance to be unregistered. 955f68a8342SChanwoo Choi * 956f68a8342SChanwoo Choi * Note that this does not call kfree(edev) because edev was not allocated 957f68a8342SChanwoo Choi * by this class. 958f68a8342SChanwoo Choi */ 959f68a8342SChanwoo Choi void extcon_dev_unregister(struct extcon_dev *edev) 960f68a8342SChanwoo Choi { 961f68a8342SChanwoo Choi int index; 962f68a8342SChanwoo Choi 963f68a8342SChanwoo Choi mutex_lock(&extcon_dev_list_lock); 964f68a8342SChanwoo Choi list_del(&edev->entry); 965f68a8342SChanwoo Choi mutex_unlock(&extcon_dev_list_lock); 966f68a8342SChanwoo Choi 967f68a8342SChanwoo Choi if (IS_ERR_OR_NULL(get_device(&edev->dev))) { 968f68a8342SChanwoo Choi dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n", 969f68a8342SChanwoo Choi dev_name(&edev->dev)); 970f68a8342SChanwoo Choi return; 971f68a8342SChanwoo Choi } 972f68a8342SChanwoo Choi 973f68a8342SChanwoo Choi device_unregister(&edev->dev); 974f68a8342SChanwoo Choi 975f68a8342SChanwoo Choi if (edev->mutually_exclusive && edev->max_supported) { 976f68a8342SChanwoo Choi for (index = 0; edev->mutually_exclusive[index]; 977f68a8342SChanwoo Choi index++) 978f68a8342SChanwoo Choi kfree(edev->d_attrs_muex[index].attr.name); 979f68a8342SChanwoo Choi kfree(edev->d_attrs_muex); 980f68a8342SChanwoo Choi kfree(edev->attrs_muex); 981f68a8342SChanwoo Choi } 982f68a8342SChanwoo Choi 983f68a8342SChanwoo Choi for (index = 0; index < edev->max_supported; index++) 984f68a8342SChanwoo Choi kfree(edev->cables[index].attr_g.name); 985f68a8342SChanwoo Choi 986f68a8342SChanwoo Choi if (edev->max_supported) { 987f68a8342SChanwoo Choi kfree(edev->extcon_dev_type.groups); 988f68a8342SChanwoo Choi kfree(edev->cables); 989f68a8342SChanwoo Choi } 990f68a8342SChanwoo Choi 991f68a8342SChanwoo Choi #if defined(CONFIG_ANDROID) 992f68a8342SChanwoo Choi if (switch_class) 993f68a8342SChanwoo Choi class_compat_remove_link(switch_class, &edev->dev, NULL); 994f68a8342SChanwoo Choi #endif 995f68a8342SChanwoo Choi put_device(&edev->dev); 996f68a8342SChanwoo Choi } 997f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_dev_unregister); 998f68a8342SChanwoo Choi 999f68a8342SChanwoo Choi static void devm_extcon_dev_unreg(struct device *dev, void *res) 1000f68a8342SChanwoo Choi { 1001f68a8342SChanwoo Choi extcon_dev_unregister(*(struct extcon_dev **)res); 1002f68a8342SChanwoo Choi } 1003f68a8342SChanwoo Choi 1004f68a8342SChanwoo Choi /** 1005f68a8342SChanwoo Choi * devm_extcon_dev_register() - Resource-managed extcon_dev_register() 1006f68a8342SChanwoo Choi * @dev: device to allocate extcon device 1007f68a8342SChanwoo Choi * @edev: the new extcon device to register 1008f68a8342SChanwoo Choi * 1009f68a8342SChanwoo Choi * Managed extcon_dev_register() function. If extcon device is attached with 1010f68a8342SChanwoo Choi * this function, that extcon device is automatically unregistered on driver 1011f68a8342SChanwoo Choi * detach. Internally this function calls extcon_dev_register() function. 1012f68a8342SChanwoo Choi * To get more information, refer that function. 1013f68a8342SChanwoo Choi * 1014f68a8342SChanwoo Choi * If extcon device is registered with this function and the device needs to be 1015f68a8342SChanwoo Choi * unregistered separately, devm_extcon_dev_unregister() should be used. 1016f68a8342SChanwoo Choi * 1017f68a8342SChanwoo Choi * Returns 0 if success or negaive error number if failure. 1018f68a8342SChanwoo Choi */ 1019f68a8342SChanwoo Choi int devm_extcon_dev_register(struct device *dev, struct extcon_dev *edev) 1020f68a8342SChanwoo Choi { 1021f68a8342SChanwoo Choi struct extcon_dev **ptr; 1022f68a8342SChanwoo Choi int ret; 1023f68a8342SChanwoo Choi 1024f68a8342SChanwoo Choi ptr = devres_alloc(devm_extcon_dev_unreg, sizeof(*ptr), GFP_KERNEL); 1025f68a8342SChanwoo Choi if (!ptr) 1026f68a8342SChanwoo Choi return -ENOMEM; 1027f68a8342SChanwoo Choi 1028f68a8342SChanwoo Choi ret = extcon_dev_register(edev); 1029f68a8342SChanwoo Choi if (ret) { 1030f68a8342SChanwoo Choi devres_free(ptr); 1031f68a8342SChanwoo Choi return ret; 1032f68a8342SChanwoo Choi } 1033f68a8342SChanwoo Choi 1034f68a8342SChanwoo Choi *ptr = edev; 1035f68a8342SChanwoo Choi devres_add(dev, ptr); 1036f68a8342SChanwoo Choi 1037f68a8342SChanwoo Choi return 0; 1038f68a8342SChanwoo Choi } 1039f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(devm_extcon_dev_register); 1040f68a8342SChanwoo Choi 1041f68a8342SChanwoo Choi /** 1042f68a8342SChanwoo Choi * devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister() 1043f68a8342SChanwoo Choi * @dev: device the extcon belongs to 1044f68a8342SChanwoo Choi * @edev: the extcon device to unregister 1045f68a8342SChanwoo Choi * 1046f68a8342SChanwoo Choi * Unregister extcon device that is registered with devm_extcon_dev_register() 1047f68a8342SChanwoo Choi * function. 1048f68a8342SChanwoo Choi */ 1049f68a8342SChanwoo Choi void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev) 1050f68a8342SChanwoo Choi { 1051f68a8342SChanwoo Choi WARN_ON(devres_release(dev, devm_extcon_dev_unreg, 1052f68a8342SChanwoo Choi devm_extcon_dev_match, edev)); 1053f68a8342SChanwoo Choi } 1054f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister); 1055f68a8342SChanwoo Choi 1056f68a8342SChanwoo Choi #ifdef CONFIG_OF 1057f68a8342SChanwoo Choi /* 1058f68a8342SChanwoo Choi * extcon_get_edev_by_phandle - Get the extcon device from devicetree 1059f68a8342SChanwoo Choi * @dev - instance to the given device 1060f68a8342SChanwoo Choi * @index - index into list of extcon_dev 1061f68a8342SChanwoo Choi * 1062f68a8342SChanwoo Choi * return the instance of extcon device 1063f68a8342SChanwoo Choi */ 1064f68a8342SChanwoo Choi struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) 1065f68a8342SChanwoo Choi { 1066f68a8342SChanwoo Choi struct device_node *node; 1067f68a8342SChanwoo Choi struct extcon_dev *edev; 1068f68a8342SChanwoo Choi 1069f68a8342SChanwoo Choi if (!dev->of_node) { 1070f68a8342SChanwoo Choi dev_err(dev, "device does not have a device node entry\n"); 1071f68a8342SChanwoo Choi return ERR_PTR(-EINVAL); 1072f68a8342SChanwoo Choi } 1073f68a8342SChanwoo Choi 1074f68a8342SChanwoo Choi node = of_parse_phandle(dev->of_node, "extcon", index); 1075f68a8342SChanwoo Choi if (!node) { 1076f68a8342SChanwoo Choi dev_err(dev, "failed to get phandle in %s node\n", 1077f68a8342SChanwoo Choi dev->of_node->full_name); 1078f68a8342SChanwoo Choi return ERR_PTR(-ENODEV); 1079f68a8342SChanwoo Choi } 1080f68a8342SChanwoo Choi 1081f68a8342SChanwoo Choi mutex_lock(&extcon_dev_list_lock); 1082f68a8342SChanwoo Choi list_for_each_entry(edev, &extcon_dev_list, entry) { 1083f68a8342SChanwoo Choi if (edev->dev.parent && edev->dev.parent->of_node == node) { 1084f68a8342SChanwoo Choi mutex_unlock(&extcon_dev_list_lock); 1085f68a8342SChanwoo Choi return edev; 1086f68a8342SChanwoo Choi } 1087f68a8342SChanwoo Choi } 1088f68a8342SChanwoo Choi mutex_unlock(&extcon_dev_list_lock); 1089f68a8342SChanwoo Choi 1090f68a8342SChanwoo Choi return ERR_PTR(-EPROBE_DEFER); 1091f68a8342SChanwoo Choi } 1092f68a8342SChanwoo Choi #else 1093f68a8342SChanwoo Choi struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) 1094f68a8342SChanwoo Choi { 1095f68a8342SChanwoo Choi return ERR_PTR(-ENOSYS); 1096f68a8342SChanwoo Choi } 1097f68a8342SChanwoo Choi #endif /* CONFIG_OF */ 1098f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle); 1099f68a8342SChanwoo Choi 1100707d7550SChanwoo Choi /** 1101707d7550SChanwoo Choi * extcon_get_edev_name() - Get the name of the extcon device. 1102707d7550SChanwoo Choi * @edev: the extcon device 1103707d7550SChanwoo Choi */ 1104707d7550SChanwoo Choi const char *extcon_get_edev_name(struct extcon_dev *edev) 1105707d7550SChanwoo Choi { 1106707d7550SChanwoo Choi return !edev ? NULL : edev->name; 1107707d7550SChanwoo Choi } 1108707d7550SChanwoo Choi 1109f68a8342SChanwoo Choi static int __init extcon_class_init(void) 1110f68a8342SChanwoo Choi { 1111f68a8342SChanwoo Choi return create_extcon_class(); 1112f68a8342SChanwoo Choi } 1113f68a8342SChanwoo Choi module_init(extcon_class_init); 1114f68a8342SChanwoo Choi 1115f68a8342SChanwoo Choi static void __exit extcon_class_exit(void) 1116f68a8342SChanwoo Choi { 1117f68a8342SChanwoo Choi #if defined(CONFIG_ANDROID) 1118f68a8342SChanwoo Choi class_compat_unregister(switch_class); 1119f68a8342SChanwoo Choi #endif 1120f68a8342SChanwoo Choi class_destroy(extcon_class); 1121f68a8342SChanwoo Choi } 1122f68a8342SChanwoo Choi module_exit(extcon_class_exit); 1123f68a8342SChanwoo Choi 11242a9de9c0SChanwoo Choi MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>"); 1125f68a8342SChanwoo Choi MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); 1126f68a8342SChanwoo Choi MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); 1127f68a8342SChanwoo Choi MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); 1128f68a8342SChanwoo Choi MODULE_DESCRIPTION("External connector (extcon) class driver"); 1129f68a8342SChanwoo Choi MODULE_LICENSE("GPL"); 1130