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 4811eecf91SChanwoo Choi /* Charging external connector */ 4911eecf91SChanwoo Choi [EXTCON_CHG_USB_SDP] = "SDP", 5011eecf91SChanwoo Choi [EXTCON_CHG_USB_DCP] = "DCP", 5111eecf91SChanwoo Choi [EXTCON_CHG_USB_CDP] = "CDP", 5211eecf91SChanwoo Choi [EXTCON_CHG_USB_ACA] = "ACA", 5311eecf91SChanwoo Choi [EXTCON_CHG_USB_FAST] = "FAST-CHARGER", 5411eecf91SChanwoo Choi [EXTCON_CHG_USB_SLOW] = "SLOW-CHARGER", 558e9bc36dSChanwoo Choi 5611eecf91SChanwoo Choi /* Jack external connector */ 5711eecf91SChanwoo Choi [EXTCON_JACK_MICROPHONE] = "MICROPHONE", 5811eecf91SChanwoo Choi [EXTCON_JACK_HEADPHONE] = "HEADPHONE", 5911eecf91SChanwoo Choi [EXTCON_JACK_LINE_IN] = "LINE-IN", 6011eecf91SChanwoo Choi [EXTCON_JACK_LINE_OUT] = "LINE-OUT", 6111eecf91SChanwoo Choi [EXTCON_JACK_VIDEO_IN] = "VIDEO-IN", 6211eecf91SChanwoo Choi [EXTCON_JACK_VIDEO_OUT] = "VIDEO-OUT", 6311eecf91SChanwoo Choi [EXTCON_JACK_SPDIF_IN] = "SPDIF-IN", 6411eecf91SChanwoo Choi [EXTCON_JACK_SPDIF_OUT] = "SPDIF-OUT", 658e9bc36dSChanwoo Choi 6611eecf91SChanwoo Choi /* Display external connector */ 6711eecf91SChanwoo Choi [EXTCON_DISP_HDMI] = "HDMI", 6811eecf91SChanwoo Choi [EXTCON_DISP_MHL] = "MHL", 6911eecf91SChanwoo Choi [EXTCON_DISP_DVI] = "DVI", 7011eecf91SChanwoo Choi [EXTCON_DISP_VGA] = "VGA", 718e9bc36dSChanwoo Choi 7211eecf91SChanwoo Choi /* Miscellaneous external connector */ 738e9bc36dSChanwoo Choi [EXTCON_DOCK] = "DOCK", 742a9de9c0SChanwoo Choi [EXTCON_JIG] = "JIG", 758e9bc36dSChanwoo Choi [EXTCON_MECHANICAL] = "MECHANICAL", 768e9bc36dSChanwoo Choi 772a9de9c0SChanwoo Choi NULL, 78f68a8342SChanwoo Choi }; 79f68a8342SChanwoo Choi 80f68a8342SChanwoo Choi static struct class *extcon_class; 81f68a8342SChanwoo Choi #if defined(CONFIG_ANDROID) 82f68a8342SChanwoo Choi static struct class_compat *switch_class; 83f68a8342SChanwoo Choi #endif /* CONFIG_ANDROID */ 84f68a8342SChanwoo Choi 85f68a8342SChanwoo Choi static LIST_HEAD(extcon_dev_list); 86f68a8342SChanwoo Choi static DEFINE_MUTEX(extcon_dev_list_lock); 87f68a8342SChanwoo Choi 88f68a8342SChanwoo Choi /** 89f68a8342SChanwoo Choi * check_mutually_exclusive - Check if new_state violates mutually_exclusive 90f68a8342SChanwoo Choi * condition. 91f68a8342SChanwoo Choi * @edev: the extcon device 92f68a8342SChanwoo Choi * @new_state: new cable attach status for @edev 93f68a8342SChanwoo Choi * 94f68a8342SChanwoo Choi * Returns 0 if nothing violates. Returns the index + 1 for the first 95f68a8342SChanwoo Choi * violated condition. 96f68a8342SChanwoo Choi */ 97f68a8342SChanwoo Choi static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state) 98f68a8342SChanwoo Choi { 99f68a8342SChanwoo Choi int i = 0; 100f68a8342SChanwoo Choi 101f68a8342SChanwoo Choi if (!edev->mutually_exclusive) 102f68a8342SChanwoo Choi return 0; 103f68a8342SChanwoo Choi 104f68a8342SChanwoo Choi for (i = 0; edev->mutually_exclusive[i]; i++) { 105f68a8342SChanwoo Choi int weight; 106f68a8342SChanwoo Choi u32 correspondants = new_state & edev->mutually_exclusive[i]; 107f68a8342SChanwoo Choi 108f68a8342SChanwoo Choi /* calculate the total number of bits set */ 109f68a8342SChanwoo Choi weight = hweight32(correspondants); 110f68a8342SChanwoo Choi if (weight > 1) 111f68a8342SChanwoo Choi return i + 1; 112f68a8342SChanwoo Choi } 113f68a8342SChanwoo Choi 114f68a8342SChanwoo Choi return 0; 115f68a8342SChanwoo Choi } 116f68a8342SChanwoo Choi 11773b6ecdbSChanwoo Choi static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id) 1182a9de9c0SChanwoo Choi { 1192a9de9c0SChanwoo Choi int i; 1202a9de9c0SChanwoo Choi 1212a9de9c0SChanwoo Choi /* Find the the index of extcon cable in edev->supported_cable */ 1222a9de9c0SChanwoo Choi for (i = 0; i < edev->max_supported; i++) { 1232a9de9c0SChanwoo Choi if (edev->supported_cable[i] == id) 1242a9de9c0SChanwoo Choi return i; 1252a9de9c0SChanwoo Choi } 1262a9de9c0SChanwoo Choi 1272a9de9c0SChanwoo Choi return -EINVAL; 1282a9de9c0SChanwoo Choi } 1292a9de9c0SChanwoo Choi 130be052cc8SRoger Quadros static int find_cable_id_by_name(struct extcon_dev *edev, const char *name) 1312a9de9c0SChanwoo Choi { 132a598af7fSDan Carpenter int id = -EINVAL; 13373b6ecdbSChanwoo Choi int i = 0; 1342a9de9c0SChanwoo Choi 135be052cc8SRoger Quadros /* Find the id of extcon cable */ 13673b6ecdbSChanwoo Choi while (extcon_name[i]) { 1372a9de9c0SChanwoo Choi if (!strncmp(extcon_name[i], name, CABLE_NAME_MAX)) { 1382a9de9c0SChanwoo Choi id = i; 1392a9de9c0SChanwoo Choi break; 1402a9de9c0SChanwoo Choi } 141be052cc8SRoger Quadros i++; 1422a9de9c0SChanwoo Choi } 1432a9de9c0SChanwoo Choi 144be052cc8SRoger Quadros return id; 145be052cc8SRoger Quadros } 146be052cc8SRoger Quadros 147be052cc8SRoger Quadros static int find_cable_index_by_name(struct extcon_dev *edev, const char *name) 148be052cc8SRoger Quadros { 149a598af7fSDan Carpenter int id; 150be052cc8SRoger Quadros 151be052cc8SRoger Quadros if (edev->max_supported == 0) 1522a9de9c0SChanwoo Choi return -EINVAL; 1532a9de9c0SChanwoo Choi 154be052cc8SRoger Quadros /* Find the the number of extcon cable */ 155be052cc8SRoger Quadros id = find_cable_id_by_name(edev, name); 156be052cc8SRoger Quadros if (id < 0) 157be052cc8SRoger Quadros return id; 158be052cc8SRoger Quadros 1592a9de9c0SChanwoo Choi return find_cable_index_by_id(edev, id); 1602a9de9c0SChanwoo Choi } 1612a9de9c0SChanwoo Choi 162046050f6SChanwoo Choi static bool is_extcon_changed(u32 prev, u32 new, int idx, bool *attached) 163046050f6SChanwoo Choi { 164046050f6SChanwoo Choi if (((prev >> idx) & 0x1) != ((new >> idx) & 0x1)) { 165f4513b06SHans de Goede *attached = ((new >> idx) & 0x1) ? true : false; 166046050f6SChanwoo Choi return true; 167046050f6SChanwoo Choi } 168046050f6SChanwoo Choi 169046050f6SChanwoo Choi return false; 170046050f6SChanwoo Choi } 171046050f6SChanwoo Choi 172f68a8342SChanwoo Choi static ssize_t state_show(struct device *dev, struct device_attribute *attr, 173f68a8342SChanwoo Choi char *buf) 174f68a8342SChanwoo Choi { 175f68a8342SChanwoo Choi int i, count = 0; 176f68a8342SChanwoo Choi struct extcon_dev *edev = dev_get_drvdata(dev); 177f68a8342SChanwoo Choi 178f68a8342SChanwoo Choi if (edev->max_supported == 0) 179f68a8342SChanwoo Choi return sprintf(buf, "%u\n", edev->state); 180f68a8342SChanwoo Choi 1812a9de9c0SChanwoo Choi for (i = 0; i < edev->max_supported; i++) { 182f68a8342SChanwoo Choi count += sprintf(buf + count, "%s=%d\n", 1832a9de9c0SChanwoo Choi extcon_name[edev->supported_cable[i]], 184f68a8342SChanwoo Choi !!(edev->state & (1 << i))); 185f68a8342SChanwoo Choi } 186f68a8342SChanwoo Choi 187f68a8342SChanwoo Choi return count; 188f68a8342SChanwoo Choi } 189f68a8342SChanwoo Choi 190f68a8342SChanwoo Choi static ssize_t state_store(struct device *dev, struct device_attribute *attr, 191f68a8342SChanwoo Choi const char *buf, size_t count) 192f68a8342SChanwoo Choi { 193f68a8342SChanwoo Choi u32 state; 194f68a8342SChanwoo Choi ssize_t ret = 0; 195f68a8342SChanwoo Choi struct extcon_dev *edev = dev_get_drvdata(dev); 196f68a8342SChanwoo Choi 197f68a8342SChanwoo Choi ret = sscanf(buf, "0x%x", &state); 198f68a8342SChanwoo Choi if (ret == 0) 199f68a8342SChanwoo Choi ret = -EINVAL; 200f68a8342SChanwoo Choi else 201f68a8342SChanwoo Choi ret = extcon_set_state(edev, state); 202f68a8342SChanwoo Choi 203f68a8342SChanwoo Choi if (ret < 0) 204f68a8342SChanwoo Choi return ret; 205f68a8342SChanwoo Choi 206f68a8342SChanwoo Choi return count; 207f68a8342SChanwoo Choi } 208f68a8342SChanwoo Choi static DEVICE_ATTR_RW(state); 209f68a8342SChanwoo Choi 210f68a8342SChanwoo Choi static ssize_t name_show(struct device *dev, struct device_attribute *attr, 211f68a8342SChanwoo Choi char *buf) 212f68a8342SChanwoo Choi { 213f68a8342SChanwoo Choi struct extcon_dev *edev = dev_get_drvdata(dev); 214f68a8342SChanwoo Choi 21571c3ffa5SChanwoo Choi return sprintf(buf, "%s\n", edev->name); 216f68a8342SChanwoo Choi } 217f68a8342SChanwoo Choi static DEVICE_ATTR_RO(name); 218f68a8342SChanwoo Choi 219f68a8342SChanwoo Choi static ssize_t cable_name_show(struct device *dev, 220f68a8342SChanwoo Choi struct device_attribute *attr, char *buf) 221f68a8342SChanwoo Choi { 222f68a8342SChanwoo Choi struct extcon_cable *cable = container_of(attr, struct extcon_cable, 223f68a8342SChanwoo Choi attr_name); 2242a9de9c0SChanwoo Choi int i = cable->cable_index; 225f68a8342SChanwoo Choi 226f68a8342SChanwoo Choi return sprintf(buf, "%s\n", 2272a9de9c0SChanwoo Choi extcon_name[cable->edev->supported_cable[i]]); 228f68a8342SChanwoo Choi } 229f68a8342SChanwoo Choi 230f68a8342SChanwoo Choi static ssize_t cable_state_show(struct device *dev, 231f68a8342SChanwoo Choi struct device_attribute *attr, char *buf) 232f68a8342SChanwoo Choi { 233f68a8342SChanwoo Choi struct extcon_cable *cable = container_of(attr, struct extcon_cable, 234f68a8342SChanwoo Choi attr_state); 235f68a8342SChanwoo Choi 236be052cc8SRoger Quadros int i = cable->cable_index; 237be052cc8SRoger Quadros 238f68a8342SChanwoo Choi return sprintf(buf, "%d\n", 239f68a8342SChanwoo Choi extcon_get_cable_state_(cable->edev, 240be052cc8SRoger Quadros cable->edev->supported_cable[i])); 241f68a8342SChanwoo Choi } 242f68a8342SChanwoo Choi 243f68a8342SChanwoo Choi /** 244f68a8342SChanwoo Choi * extcon_update_state() - Update the cable attach states of the extcon device 245f68a8342SChanwoo Choi * only for the masked bits. 246f68a8342SChanwoo Choi * @edev: the extcon device 247f68a8342SChanwoo Choi * @mask: the bit mask to designate updated bits. 248f68a8342SChanwoo Choi * @state: new cable attach status for @edev 249f68a8342SChanwoo Choi * 250f68a8342SChanwoo Choi * Changing the state sends uevent with environment variable containing 251f68a8342SChanwoo Choi * the name of extcon device (envp[0]) and the state output (envp[1]). 252f68a8342SChanwoo Choi * Tizen uses this format for extcon device to get events from ports. 253f68a8342SChanwoo Choi * Android uses this format as well. 254f68a8342SChanwoo Choi * 255f68a8342SChanwoo Choi * Note that the notifier provides which bits are changed in the state 256f68a8342SChanwoo Choi * variable with the val parameter (second) to the callback. 257f68a8342SChanwoo Choi */ 258f68a8342SChanwoo Choi int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state) 259f68a8342SChanwoo Choi { 260f68a8342SChanwoo Choi char name_buf[120]; 261f68a8342SChanwoo Choi char state_buf[120]; 262f68a8342SChanwoo Choi char *prop_buf; 263f68a8342SChanwoo Choi char *envp[3]; 264f68a8342SChanwoo Choi int env_offset = 0; 265f68a8342SChanwoo Choi int length; 266046050f6SChanwoo Choi int index; 267f68a8342SChanwoo Choi unsigned long flags; 268046050f6SChanwoo Choi bool attached; 269f68a8342SChanwoo Choi 2707eae43aeSChanwoo Choi if (!edev) 2717eae43aeSChanwoo Choi return -EINVAL; 2727eae43aeSChanwoo Choi 273f68a8342SChanwoo Choi spin_lock_irqsave(&edev->lock, flags); 274f68a8342SChanwoo Choi 275f68a8342SChanwoo Choi if (edev->state != ((edev->state & ~mask) | (state & mask))) { 276f7a89811SRoger Quadros u32 old_state; 277f7a89811SRoger Quadros 278f68a8342SChanwoo Choi if (check_mutually_exclusive(edev, (edev->state & ~mask) | 279f68a8342SChanwoo Choi (state & mask))) { 280f68a8342SChanwoo Choi spin_unlock_irqrestore(&edev->lock, flags); 281f68a8342SChanwoo Choi return -EPERM; 282f68a8342SChanwoo Choi } 283f68a8342SChanwoo Choi 284f7a89811SRoger Quadros old_state = edev->state; 285f68a8342SChanwoo Choi edev->state &= ~mask; 286f68a8342SChanwoo Choi edev->state |= state & mask; 287f68a8342SChanwoo Choi 288f7a89811SRoger Quadros for (index = 0; index < edev->max_supported; index++) { 289f7a89811SRoger Quadros if (is_extcon_changed(old_state, edev->state, index, 290f7a89811SRoger Quadros &attached)) 291f7a89811SRoger Quadros raw_notifier_call_chain(&edev->nh[index], 292f7a89811SRoger Quadros attached, edev); 293f7a89811SRoger Quadros } 294f7a89811SRoger Quadros 295f68a8342SChanwoo Choi /* This could be in interrupt handler */ 296f68a8342SChanwoo Choi prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); 297f68a8342SChanwoo Choi if (prop_buf) { 298f68a8342SChanwoo Choi length = name_show(&edev->dev, NULL, prop_buf); 299f68a8342SChanwoo Choi if (length > 0) { 300f68a8342SChanwoo Choi if (prop_buf[length - 1] == '\n') 301f68a8342SChanwoo Choi prop_buf[length - 1] = 0; 302f68a8342SChanwoo Choi snprintf(name_buf, sizeof(name_buf), 303f68a8342SChanwoo Choi "NAME=%s", prop_buf); 304f68a8342SChanwoo Choi envp[env_offset++] = name_buf; 305f68a8342SChanwoo Choi } 306f68a8342SChanwoo Choi length = state_show(&edev->dev, NULL, prop_buf); 307f68a8342SChanwoo Choi if (length > 0) { 308f68a8342SChanwoo Choi if (prop_buf[length - 1] == '\n') 309f68a8342SChanwoo Choi prop_buf[length - 1] = 0; 310f68a8342SChanwoo Choi snprintf(state_buf, sizeof(state_buf), 311f68a8342SChanwoo Choi "STATE=%s", prop_buf); 312f68a8342SChanwoo Choi envp[env_offset++] = state_buf; 313f68a8342SChanwoo Choi } 314f68a8342SChanwoo Choi envp[env_offset] = NULL; 315f68a8342SChanwoo Choi /* Unlock early before uevent */ 316f68a8342SChanwoo Choi spin_unlock_irqrestore(&edev->lock, flags); 317f68a8342SChanwoo Choi 318f68a8342SChanwoo Choi kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp); 319f68a8342SChanwoo Choi free_page((unsigned long)prop_buf); 320f68a8342SChanwoo Choi } else { 321f68a8342SChanwoo Choi /* Unlock early before uevent */ 322f68a8342SChanwoo Choi spin_unlock_irqrestore(&edev->lock, flags); 323f68a8342SChanwoo Choi 324f68a8342SChanwoo Choi dev_err(&edev->dev, "out of memory in extcon_set_state\n"); 325f68a8342SChanwoo Choi kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE); 326f68a8342SChanwoo Choi } 327f68a8342SChanwoo Choi } else { 328f68a8342SChanwoo Choi /* No changes */ 329f68a8342SChanwoo Choi spin_unlock_irqrestore(&edev->lock, flags); 330f68a8342SChanwoo Choi } 331f68a8342SChanwoo Choi 332f68a8342SChanwoo Choi return 0; 333f68a8342SChanwoo Choi } 334f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_update_state); 335f68a8342SChanwoo Choi 336f68a8342SChanwoo Choi /** 337f68a8342SChanwoo Choi * extcon_set_state() - Set the cable attach states of the extcon device. 338f68a8342SChanwoo Choi * @edev: the extcon device 339f68a8342SChanwoo Choi * @state: new cable attach status for @edev 340f68a8342SChanwoo Choi * 341f68a8342SChanwoo Choi * Note that notifier provides which bits are changed in the state 342f68a8342SChanwoo Choi * variable with the val parameter (second) to the callback. 343f68a8342SChanwoo Choi */ 344f68a8342SChanwoo Choi int extcon_set_state(struct extcon_dev *edev, u32 state) 345f68a8342SChanwoo Choi { 3467eae43aeSChanwoo Choi if (!edev) 3477eae43aeSChanwoo Choi return -EINVAL; 3487eae43aeSChanwoo Choi 349f68a8342SChanwoo Choi return extcon_update_state(edev, 0xffffffff, state); 350f68a8342SChanwoo Choi } 351f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_set_state); 352f68a8342SChanwoo Choi 353f68a8342SChanwoo Choi /** 354f68a8342SChanwoo Choi * extcon_get_cable_state_() - Get the status of a specific cable. 355f68a8342SChanwoo Choi * @edev: the extcon device that has the cable. 3562a9de9c0SChanwoo Choi * @id: the unique id of each external connector in extcon enumeration. 357f68a8342SChanwoo Choi */ 35873b6ecdbSChanwoo Choi int extcon_get_cable_state_(struct extcon_dev *edev, const unsigned int id) 359f68a8342SChanwoo Choi { 3602a9de9c0SChanwoo Choi int index; 3612a9de9c0SChanwoo Choi 3627eae43aeSChanwoo Choi if (!edev) 3637eae43aeSChanwoo Choi return -EINVAL; 3647eae43aeSChanwoo Choi 3652a9de9c0SChanwoo Choi index = find_cable_index_by_id(edev, id); 3662a9de9c0SChanwoo Choi if (index < 0) 3672a9de9c0SChanwoo Choi return index; 3682a9de9c0SChanwoo Choi 3692a9de9c0SChanwoo Choi if (edev->max_supported && edev->max_supported <= index) 370f68a8342SChanwoo Choi return -EINVAL; 371f68a8342SChanwoo Choi 372f68a8342SChanwoo Choi return !!(edev->state & (1 << index)); 373f68a8342SChanwoo Choi } 374f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_get_cable_state_); 375f68a8342SChanwoo Choi 376f68a8342SChanwoo Choi /** 377f68a8342SChanwoo Choi * extcon_get_cable_state() - Get the status of a specific cable. 378f68a8342SChanwoo Choi * @edev: the extcon device that has the cable. 379f68a8342SChanwoo Choi * @cable_name: cable name. 380f68a8342SChanwoo Choi * 381f68a8342SChanwoo Choi * Note that this is slower than extcon_get_cable_state_. 382f68a8342SChanwoo Choi */ 383f68a8342SChanwoo Choi int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name) 384f68a8342SChanwoo Choi { 385a598af7fSDan Carpenter int id; 386be052cc8SRoger Quadros 387be052cc8SRoger Quadros id = find_cable_id_by_name(edev, cable_name); 388be052cc8SRoger Quadros if (id < 0) 389be052cc8SRoger Quadros return id; 390be052cc8SRoger Quadros 391be052cc8SRoger Quadros return extcon_get_cable_state_(edev, id); 392f68a8342SChanwoo Choi } 393f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_get_cable_state); 394f68a8342SChanwoo Choi 395f68a8342SChanwoo Choi /** 396f68a8342SChanwoo Choi * extcon_set_cable_state_() - Set the status of a specific cable. 397f68a8342SChanwoo Choi * @edev: the extcon device that has the cable. 3982a9de9c0SChanwoo Choi * @id: the unique id of each external connector 3992a9de9c0SChanwoo Choi * in extcon enumeration. 4002a9de9c0SChanwoo Choi * @state: the new cable status. The default semantics is 401f68a8342SChanwoo Choi * true: attached / false: detached. 402f68a8342SChanwoo Choi */ 40373b6ecdbSChanwoo Choi int extcon_set_cable_state_(struct extcon_dev *edev, unsigned int id, 4042a9de9c0SChanwoo Choi bool cable_state) 405f68a8342SChanwoo Choi { 406f68a8342SChanwoo Choi u32 state; 4072a9de9c0SChanwoo Choi int index; 408f68a8342SChanwoo Choi 4097eae43aeSChanwoo Choi if (!edev) 4107eae43aeSChanwoo Choi return -EINVAL; 4117eae43aeSChanwoo Choi 4122a9de9c0SChanwoo Choi index = find_cable_index_by_id(edev, id); 4132a9de9c0SChanwoo Choi if (index < 0) 4142a9de9c0SChanwoo Choi return index; 4152a9de9c0SChanwoo Choi 4162a9de9c0SChanwoo Choi if (edev->max_supported && edev->max_supported <= index) 417f68a8342SChanwoo Choi return -EINVAL; 418f68a8342SChanwoo Choi 419f68a8342SChanwoo Choi state = cable_state ? (1 << index) : 0; 420f68a8342SChanwoo Choi return extcon_update_state(edev, 1 << index, state); 421f68a8342SChanwoo Choi } 422f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_set_cable_state_); 423f68a8342SChanwoo Choi 424f68a8342SChanwoo Choi /** 425f68a8342SChanwoo Choi * extcon_set_cable_state() - Set the status of a specific cable. 426f68a8342SChanwoo Choi * @edev: the extcon device that has the cable. 427f68a8342SChanwoo Choi * @cable_name: cable name. 428f68a8342SChanwoo Choi * @cable_state: the new cable status. The default semantics is 429f68a8342SChanwoo Choi * true: attached / false: detached. 430f68a8342SChanwoo Choi * 431f68a8342SChanwoo Choi * Note that this is slower than extcon_set_cable_state_. 432f68a8342SChanwoo Choi */ 433f68a8342SChanwoo Choi int extcon_set_cable_state(struct extcon_dev *edev, 434f68a8342SChanwoo Choi const char *cable_name, bool cable_state) 435f68a8342SChanwoo Choi { 436a598af7fSDan Carpenter int id; 437be052cc8SRoger Quadros 438be052cc8SRoger Quadros id = find_cable_id_by_name(edev, cable_name); 439be052cc8SRoger Quadros if (id < 0) 440be052cc8SRoger Quadros return id; 441be052cc8SRoger Quadros 442be052cc8SRoger Quadros return extcon_set_cable_state_(edev, id, cable_state); 443f68a8342SChanwoo Choi } 444f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_set_cable_state); 445f68a8342SChanwoo Choi 446f68a8342SChanwoo Choi /** 447f68a8342SChanwoo Choi * extcon_get_extcon_dev() - Get the extcon device instance from the name 448f68a8342SChanwoo Choi * @extcon_name: The extcon name provided with extcon_dev_register() 449f68a8342SChanwoo Choi */ 450f68a8342SChanwoo Choi struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) 451f68a8342SChanwoo Choi { 452f68a8342SChanwoo Choi struct extcon_dev *sd; 453f68a8342SChanwoo Choi 4547eae43aeSChanwoo Choi if (!extcon_name) 4557eae43aeSChanwoo Choi return ERR_PTR(-EINVAL); 4567eae43aeSChanwoo Choi 457f68a8342SChanwoo Choi mutex_lock(&extcon_dev_list_lock); 458f68a8342SChanwoo Choi list_for_each_entry(sd, &extcon_dev_list, entry) { 459f68a8342SChanwoo Choi if (!strcmp(sd->name, extcon_name)) 460f68a8342SChanwoo Choi goto out; 461f68a8342SChanwoo Choi } 462f68a8342SChanwoo Choi sd = NULL; 463f68a8342SChanwoo Choi out: 464f68a8342SChanwoo Choi mutex_unlock(&extcon_dev_list_lock); 465f68a8342SChanwoo Choi return sd; 466f68a8342SChanwoo Choi } 467f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); 468f68a8342SChanwoo Choi 469f68a8342SChanwoo Choi /** 470f68a8342SChanwoo Choi * extcon_register_interest() - Register a notifier for a state change of a 471f68a8342SChanwoo Choi * specific cable, not an entier set of cables of a 472f68a8342SChanwoo Choi * extcon device. 473f68a8342SChanwoo Choi * @obj: an empty extcon_specific_cable_nb object to be returned. 474f68a8342SChanwoo Choi * @extcon_name: the name of extcon device. 475f68a8342SChanwoo Choi * if NULL, extcon_register_interest will register 476f68a8342SChanwoo Choi * every cable with the target cable_name given. 477f68a8342SChanwoo Choi * @cable_name: the target cable name. 478f68a8342SChanwoo Choi * @nb: the notifier block to get notified. 479f68a8342SChanwoo Choi * 480f68a8342SChanwoo Choi * Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets 481f68a8342SChanwoo Choi * the struct for you. 482f68a8342SChanwoo Choi * 483f68a8342SChanwoo Choi * extcon_register_interest is a helper function for those who want to get 484f68a8342SChanwoo Choi * notification for a single specific cable's status change. If a user wants 485f68a8342SChanwoo Choi * to get notification for any changes of all cables of a extcon device, 486f68a8342SChanwoo Choi * he/she should use the general extcon_register_notifier(). 487f68a8342SChanwoo Choi * 488f68a8342SChanwoo Choi * Note that the second parameter given to the callback of nb (val) is 489f68a8342SChanwoo Choi * "old_state", not the current state. The current state can be retrieved 490f68a8342SChanwoo Choi * by looking at the third pameter (edev pointer)'s state value. 491f68a8342SChanwoo Choi */ 492f68a8342SChanwoo Choi int extcon_register_interest(struct extcon_specific_cable_nb *obj, 493f68a8342SChanwoo Choi const char *extcon_name, const char *cable_name, 494f68a8342SChanwoo Choi struct notifier_block *nb) 495f68a8342SChanwoo Choi { 49666bee35fSHans de Goede unsigned long flags; 49766bee35fSHans de Goede int ret; 49866bee35fSHans de Goede 499f68a8342SChanwoo Choi if (!obj || !cable_name || !nb) 500f68a8342SChanwoo Choi return -EINVAL; 501f68a8342SChanwoo Choi 502f68a8342SChanwoo Choi if (extcon_name) { 503f68a8342SChanwoo Choi obj->edev = extcon_get_extcon_dev(extcon_name); 504f68a8342SChanwoo Choi if (!obj->edev) 505f68a8342SChanwoo Choi return -ENODEV; 506f68a8342SChanwoo Choi 5072a9de9c0SChanwoo Choi obj->cable_index = find_cable_index_by_name(obj->edev, 508f68a8342SChanwoo Choi cable_name); 509f68a8342SChanwoo Choi if (obj->cable_index < 0) 510f68a8342SChanwoo Choi return obj->cable_index; 511f68a8342SChanwoo Choi 512f68a8342SChanwoo Choi obj->user_nb = nb; 513f68a8342SChanwoo Choi 51466bee35fSHans de Goede spin_lock_irqsave(&obj->edev->lock, flags); 515046050f6SChanwoo Choi ret = raw_notifier_chain_register( 516046050f6SChanwoo Choi &obj->edev->nh[obj->cable_index], 517046050f6SChanwoo Choi obj->user_nb); 51866bee35fSHans de Goede spin_unlock_irqrestore(&obj->edev->lock, flags); 519f68a8342SChanwoo Choi } else { 520f68a8342SChanwoo Choi struct class_dev_iter iter; 521f68a8342SChanwoo Choi struct extcon_dev *extd; 522f68a8342SChanwoo Choi struct device *dev; 523f68a8342SChanwoo Choi 524f68a8342SChanwoo Choi if (!extcon_class) 525f68a8342SChanwoo Choi return -ENODEV; 526f68a8342SChanwoo Choi class_dev_iter_init(&iter, extcon_class, NULL, NULL); 527f68a8342SChanwoo Choi while ((dev = class_dev_iter_next(&iter))) { 528f68a8342SChanwoo Choi extd = dev_get_drvdata(dev); 529f68a8342SChanwoo Choi 5302a9de9c0SChanwoo Choi if (find_cable_index_by_name(extd, cable_name) < 0) 531f68a8342SChanwoo Choi continue; 532f68a8342SChanwoo Choi 533f68a8342SChanwoo Choi class_dev_iter_exit(&iter); 534f68a8342SChanwoo Choi return extcon_register_interest(obj, extd->name, 535f68a8342SChanwoo Choi cable_name, nb); 536f68a8342SChanwoo Choi } 537f68a8342SChanwoo Choi 538b9ec23c0SChanwoo Choi ret = -ENODEV; 539f68a8342SChanwoo Choi } 540b9ec23c0SChanwoo Choi 541b9ec23c0SChanwoo Choi return ret; 542f68a8342SChanwoo Choi } 543f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_register_interest); 544f68a8342SChanwoo Choi 545f68a8342SChanwoo Choi /** 546f68a8342SChanwoo Choi * extcon_unregister_interest() - Unregister the notifier registered by 547f68a8342SChanwoo Choi * extcon_register_interest(). 548f68a8342SChanwoo Choi * @obj: the extcon_specific_cable_nb object returned by 549f68a8342SChanwoo Choi * extcon_register_interest(). 550f68a8342SChanwoo Choi */ 551f68a8342SChanwoo Choi int extcon_unregister_interest(struct extcon_specific_cable_nb *obj) 552f68a8342SChanwoo Choi { 55366bee35fSHans de Goede unsigned long flags; 55466bee35fSHans de Goede int ret; 55566bee35fSHans de Goede 556f68a8342SChanwoo Choi if (!obj) 557f68a8342SChanwoo Choi return -EINVAL; 558f68a8342SChanwoo Choi 55966bee35fSHans de Goede spin_lock_irqsave(&obj->edev->lock, flags); 560046050f6SChanwoo Choi ret = raw_notifier_chain_unregister( 561046050f6SChanwoo Choi &obj->edev->nh[obj->cable_index], obj->user_nb); 56266bee35fSHans de Goede spin_unlock_irqrestore(&obj->edev->lock, flags); 56366bee35fSHans de Goede 56466bee35fSHans de Goede return ret; 565f68a8342SChanwoo Choi } 566f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_unregister_interest); 567f68a8342SChanwoo Choi 568f68a8342SChanwoo Choi /** 569f68a8342SChanwoo Choi * extcon_register_notifier() - Register a notifiee to get notified by 570f68a8342SChanwoo Choi * any attach status changes from the extcon. 571046050f6SChanwoo Choi * @edev: the extcon device that has the external connecotr. 572046050f6SChanwoo Choi * @id: the unique id of each external connector in extcon enumeration. 573f68a8342SChanwoo Choi * @nb: a notifier block to be registered. 574f68a8342SChanwoo Choi * 575f68a8342SChanwoo Choi * Note that the second parameter given to the callback of nb (val) is 576f68a8342SChanwoo Choi * "old_state", not the current state. The current state can be retrieved 577f68a8342SChanwoo Choi * by looking at the third pameter (edev pointer)'s state value. 578f68a8342SChanwoo Choi */ 57973b6ecdbSChanwoo Choi int extcon_register_notifier(struct extcon_dev *edev, unsigned int id, 580f68a8342SChanwoo Choi struct notifier_block *nb) 581f68a8342SChanwoo Choi { 58266bee35fSHans de Goede unsigned long flags; 583046050f6SChanwoo Choi int ret, idx; 584046050f6SChanwoo Choi 5857eae43aeSChanwoo Choi if (!edev || !nb) 5867eae43aeSChanwoo Choi return -EINVAL; 5877eae43aeSChanwoo Choi 588046050f6SChanwoo Choi idx = find_cable_index_by_id(edev, id); 58966bee35fSHans de Goede 59066bee35fSHans de Goede spin_lock_irqsave(&edev->lock, flags); 591046050f6SChanwoo Choi ret = raw_notifier_chain_register(&edev->nh[idx], nb); 59266bee35fSHans de Goede spin_unlock_irqrestore(&edev->lock, flags); 59366bee35fSHans de Goede 59466bee35fSHans de Goede return ret; 595f68a8342SChanwoo Choi } 596f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_register_notifier); 597f68a8342SChanwoo Choi 598f68a8342SChanwoo Choi /** 599f68a8342SChanwoo Choi * extcon_unregister_notifier() - Unregister a notifiee from the extcon device. 600046050f6SChanwoo Choi * @edev: the extcon device that has the external connecotr. 601046050f6SChanwoo Choi * @id: the unique id of each external connector in extcon enumeration. 602046050f6SChanwoo Choi * @nb: a notifier block to be registered. 603f68a8342SChanwoo Choi */ 60473b6ecdbSChanwoo Choi int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id, 605f68a8342SChanwoo Choi struct notifier_block *nb) 606f68a8342SChanwoo Choi { 60766bee35fSHans de Goede unsigned long flags; 608046050f6SChanwoo Choi int ret, idx; 609046050f6SChanwoo Choi 6107eae43aeSChanwoo Choi if (!edev || !nb) 6117eae43aeSChanwoo Choi return -EINVAL; 6127eae43aeSChanwoo Choi 613046050f6SChanwoo Choi idx = find_cable_index_by_id(edev, id); 61466bee35fSHans de Goede 61566bee35fSHans de Goede spin_lock_irqsave(&edev->lock, flags); 616046050f6SChanwoo Choi ret = raw_notifier_chain_unregister(&edev->nh[idx], nb); 61766bee35fSHans de Goede spin_unlock_irqrestore(&edev->lock, flags); 61866bee35fSHans de Goede 61966bee35fSHans de Goede return ret; 620f68a8342SChanwoo Choi } 621f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_unregister_notifier); 622f68a8342SChanwoo Choi 623f68a8342SChanwoo Choi static struct attribute *extcon_attrs[] = { 624f68a8342SChanwoo Choi &dev_attr_state.attr, 625f68a8342SChanwoo Choi &dev_attr_name.attr, 626f68a8342SChanwoo Choi NULL, 627f68a8342SChanwoo Choi }; 628f68a8342SChanwoo Choi ATTRIBUTE_GROUPS(extcon); 629f68a8342SChanwoo Choi 630f68a8342SChanwoo Choi static int create_extcon_class(void) 631f68a8342SChanwoo Choi { 632f68a8342SChanwoo Choi if (!extcon_class) { 633f68a8342SChanwoo Choi extcon_class = class_create(THIS_MODULE, "extcon"); 634f68a8342SChanwoo Choi if (IS_ERR(extcon_class)) 635f68a8342SChanwoo Choi return PTR_ERR(extcon_class); 636f68a8342SChanwoo Choi extcon_class->dev_groups = extcon_groups; 637f68a8342SChanwoo Choi 638f68a8342SChanwoo Choi #if defined(CONFIG_ANDROID) 639f68a8342SChanwoo Choi switch_class = class_compat_register("switch"); 640f68a8342SChanwoo Choi if (WARN(!switch_class, "cannot allocate")) 641f68a8342SChanwoo Choi return -ENOMEM; 642f68a8342SChanwoo Choi #endif /* CONFIG_ANDROID */ 643f68a8342SChanwoo Choi } 644f68a8342SChanwoo Choi 645f68a8342SChanwoo Choi return 0; 646f68a8342SChanwoo Choi } 647f68a8342SChanwoo Choi 648f68a8342SChanwoo Choi static void extcon_dev_release(struct device *dev) 649f68a8342SChanwoo Choi { 650f68a8342SChanwoo Choi } 651f68a8342SChanwoo Choi 652f68a8342SChanwoo Choi static const char *muex_name = "mutually_exclusive"; 653f68a8342SChanwoo Choi static void dummy_sysfs_dev_release(struct device *dev) 654f68a8342SChanwoo Choi { 655f68a8342SChanwoo Choi } 656f68a8342SChanwoo Choi 657f68a8342SChanwoo Choi /* 658f68a8342SChanwoo Choi * extcon_dev_allocate() - Allocate the memory of extcon device. 6592a9de9c0SChanwoo Choi * @supported_cable: Array of supported extcon ending with EXTCON_NONE. 660f68a8342SChanwoo Choi * If supported_cable is NULL, cable name related APIs 661f68a8342SChanwoo Choi * are disabled. 662f68a8342SChanwoo Choi * 663f68a8342SChanwoo Choi * This function allocates the memory for extcon device without allocating 664f68a8342SChanwoo Choi * memory in each extcon provider driver and initialize default setting for 665f68a8342SChanwoo Choi * extcon device. 666f68a8342SChanwoo Choi * 667f68a8342SChanwoo Choi * Return the pointer of extcon device if success or ERR_PTR(err) if fail 668f68a8342SChanwoo Choi */ 66973b6ecdbSChanwoo Choi struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable) 670f68a8342SChanwoo Choi { 671f68a8342SChanwoo Choi struct extcon_dev *edev; 672f68a8342SChanwoo Choi 6737eae43aeSChanwoo Choi if (!supported_cable) 6747eae43aeSChanwoo Choi return ERR_PTR(-EINVAL); 6757eae43aeSChanwoo Choi 676f68a8342SChanwoo Choi edev = kzalloc(sizeof(*edev), GFP_KERNEL); 677f68a8342SChanwoo Choi if (!edev) 678f68a8342SChanwoo Choi return ERR_PTR(-ENOMEM); 679f68a8342SChanwoo Choi 680f68a8342SChanwoo Choi edev->max_supported = 0; 681f68a8342SChanwoo Choi edev->supported_cable = supported_cable; 682f68a8342SChanwoo Choi 683f68a8342SChanwoo Choi return edev; 684f68a8342SChanwoo Choi } 685f68a8342SChanwoo Choi 686f68a8342SChanwoo Choi /* 687f68a8342SChanwoo Choi * extcon_dev_free() - Free the memory of extcon device. 688f68a8342SChanwoo Choi * @edev: the extcon device to free 689f68a8342SChanwoo Choi */ 690f68a8342SChanwoo Choi void extcon_dev_free(struct extcon_dev *edev) 691f68a8342SChanwoo Choi { 692f68a8342SChanwoo Choi kfree(edev); 693f68a8342SChanwoo Choi } 694f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_dev_free); 695f68a8342SChanwoo Choi 696f68a8342SChanwoo Choi static int devm_extcon_dev_match(struct device *dev, void *res, void *data) 697f68a8342SChanwoo Choi { 698f68a8342SChanwoo Choi struct extcon_dev **r = res; 699f68a8342SChanwoo Choi 700f68a8342SChanwoo Choi if (WARN_ON(!r || !*r)) 701f68a8342SChanwoo Choi return 0; 702f68a8342SChanwoo Choi 703f68a8342SChanwoo Choi return *r == data; 704f68a8342SChanwoo Choi } 705f68a8342SChanwoo Choi 706f68a8342SChanwoo Choi static void devm_extcon_dev_release(struct device *dev, void *res) 707f68a8342SChanwoo Choi { 708f68a8342SChanwoo Choi extcon_dev_free(*(struct extcon_dev **)res); 709f68a8342SChanwoo Choi } 710f68a8342SChanwoo Choi 711f68a8342SChanwoo Choi /** 712f68a8342SChanwoo Choi * devm_extcon_dev_allocate - Allocate managed extcon device 713f68a8342SChanwoo Choi * @dev: device owning the extcon device being created 7142a9de9c0SChanwoo Choi * @supported_cable: Array of supported extcon ending with EXTCON_NONE. 715f68a8342SChanwoo Choi * If supported_cable is NULL, cable name related APIs 716f68a8342SChanwoo Choi * are disabled. 717f68a8342SChanwoo Choi * 718f68a8342SChanwoo Choi * This function manages automatically the memory of extcon device using device 719f68a8342SChanwoo Choi * resource management and simplify the control of freeing the memory of extcon 720f68a8342SChanwoo Choi * device. 721f68a8342SChanwoo Choi * 722f68a8342SChanwoo Choi * Returns the pointer memory of allocated extcon_dev if success 723f68a8342SChanwoo Choi * or ERR_PTR(err) if fail 724f68a8342SChanwoo Choi */ 725f68a8342SChanwoo Choi struct extcon_dev *devm_extcon_dev_allocate(struct device *dev, 72673b6ecdbSChanwoo Choi const unsigned int *supported_cable) 727f68a8342SChanwoo Choi { 728f68a8342SChanwoo Choi struct extcon_dev **ptr, *edev; 729f68a8342SChanwoo Choi 730f68a8342SChanwoo Choi ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL); 731f68a8342SChanwoo Choi if (!ptr) 732f68a8342SChanwoo Choi return ERR_PTR(-ENOMEM); 733f68a8342SChanwoo Choi 734f68a8342SChanwoo Choi edev = extcon_dev_allocate(supported_cable); 735f68a8342SChanwoo Choi if (IS_ERR(edev)) { 736f68a8342SChanwoo Choi devres_free(ptr); 737f68a8342SChanwoo Choi return edev; 738f68a8342SChanwoo Choi } 739f68a8342SChanwoo Choi 740f68a8342SChanwoo Choi edev->dev.parent = dev; 741f68a8342SChanwoo Choi 742f68a8342SChanwoo Choi *ptr = edev; 743f68a8342SChanwoo Choi devres_add(dev, ptr); 744f68a8342SChanwoo Choi 745f68a8342SChanwoo Choi return edev; 746f68a8342SChanwoo Choi } 747f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate); 748f68a8342SChanwoo Choi 749f68a8342SChanwoo Choi void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev) 750f68a8342SChanwoo Choi { 751f68a8342SChanwoo Choi WARN_ON(devres_release(dev, devm_extcon_dev_release, 752f68a8342SChanwoo Choi devm_extcon_dev_match, edev)); 753f68a8342SChanwoo Choi } 754f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(devm_extcon_dev_free); 755f68a8342SChanwoo Choi 756f68a8342SChanwoo Choi /** 757f68a8342SChanwoo Choi * extcon_dev_register() - Register a new extcon device 758f68a8342SChanwoo Choi * @edev : the new extcon device (should be allocated before calling) 759f68a8342SChanwoo Choi * 760f68a8342SChanwoo Choi * Among the members of edev struct, please set the "user initializing data" 761f68a8342SChanwoo Choi * in any case and set the "optional callbacks" if required. However, please 762f68a8342SChanwoo Choi * do not set the values of "internal data", which are initialized by 763f68a8342SChanwoo Choi * this function. 764f68a8342SChanwoo Choi */ 765f68a8342SChanwoo Choi int extcon_dev_register(struct extcon_dev *edev) 766f68a8342SChanwoo Choi { 767f68a8342SChanwoo Choi int ret, index = 0; 76871c3ffa5SChanwoo Choi static atomic_t edev_no = ATOMIC_INIT(-1); 769f68a8342SChanwoo Choi 770f68a8342SChanwoo Choi if (!extcon_class) { 771f68a8342SChanwoo Choi ret = create_extcon_class(); 772f68a8342SChanwoo Choi if (ret < 0) 773f68a8342SChanwoo Choi return ret; 774f68a8342SChanwoo Choi } 775f68a8342SChanwoo Choi 7767eae43aeSChanwoo Choi if (!edev || !edev->supported_cable) 7772a9de9c0SChanwoo Choi return -EINVAL; 778f68a8342SChanwoo Choi 7792a9de9c0SChanwoo Choi for (; edev->supported_cable[index] != EXTCON_NONE; index++); 7802a9de9c0SChanwoo Choi 7812a9de9c0SChanwoo Choi edev->max_supported = index; 782f68a8342SChanwoo Choi if (index > SUPPORTED_CABLE_MAX) { 7832a9de9c0SChanwoo Choi dev_err(&edev->dev, 7842a9de9c0SChanwoo Choi "exceed the maximum number of supported cables\n"); 785f68a8342SChanwoo Choi return -EINVAL; 786f68a8342SChanwoo Choi } 787f68a8342SChanwoo Choi 788f68a8342SChanwoo Choi edev->dev.class = extcon_class; 789f68a8342SChanwoo Choi edev->dev.release = extcon_dev_release; 790f68a8342SChanwoo Choi 79171c3ffa5SChanwoo Choi edev->name = dev_name(edev->dev.parent); 792f68a8342SChanwoo Choi if (IS_ERR_OR_NULL(edev->name)) { 793f68a8342SChanwoo Choi dev_err(&edev->dev, 794f68a8342SChanwoo Choi "extcon device name is null\n"); 795f68a8342SChanwoo Choi return -EINVAL; 796f68a8342SChanwoo Choi } 79771c3ffa5SChanwoo Choi dev_set_name(&edev->dev, "extcon%lu", 79871c3ffa5SChanwoo Choi (unsigned long)atomic_inc_return(&edev_no)); 799f68a8342SChanwoo Choi 800f68a8342SChanwoo Choi if (edev->max_supported) { 801f68a8342SChanwoo Choi char buf[10]; 802f68a8342SChanwoo Choi char *str; 803f68a8342SChanwoo Choi struct extcon_cable *cable; 804f68a8342SChanwoo Choi 805f68a8342SChanwoo Choi edev->cables = kzalloc(sizeof(struct extcon_cable) * 806f68a8342SChanwoo Choi edev->max_supported, GFP_KERNEL); 807f68a8342SChanwoo Choi if (!edev->cables) { 808f68a8342SChanwoo Choi ret = -ENOMEM; 809f68a8342SChanwoo Choi goto err_sysfs_alloc; 810f68a8342SChanwoo Choi } 811f68a8342SChanwoo Choi for (index = 0; index < edev->max_supported; index++) { 812f68a8342SChanwoo Choi cable = &edev->cables[index]; 813f68a8342SChanwoo Choi 814f68a8342SChanwoo Choi snprintf(buf, 10, "cable.%d", index); 815f68a8342SChanwoo Choi str = kzalloc(sizeof(char) * (strlen(buf) + 1), 816f68a8342SChanwoo Choi GFP_KERNEL); 817f68a8342SChanwoo Choi if (!str) { 818f68a8342SChanwoo Choi for (index--; index >= 0; index--) { 819f68a8342SChanwoo Choi cable = &edev->cables[index]; 820f68a8342SChanwoo Choi kfree(cable->attr_g.name); 821f68a8342SChanwoo Choi } 822f68a8342SChanwoo Choi ret = -ENOMEM; 823f68a8342SChanwoo Choi 824f68a8342SChanwoo Choi goto err_alloc_cables; 825f68a8342SChanwoo Choi } 826f68a8342SChanwoo Choi strcpy(str, buf); 827f68a8342SChanwoo Choi 828f68a8342SChanwoo Choi cable->edev = edev; 829f68a8342SChanwoo Choi cable->cable_index = index; 830f68a8342SChanwoo Choi cable->attrs[0] = &cable->attr_name.attr; 831f68a8342SChanwoo Choi cable->attrs[1] = &cable->attr_state.attr; 832f68a8342SChanwoo Choi cable->attrs[2] = NULL; 833f68a8342SChanwoo Choi cable->attr_g.name = str; 834f68a8342SChanwoo Choi cable->attr_g.attrs = cable->attrs; 835f68a8342SChanwoo Choi 836f68a8342SChanwoo Choi sysfs_attr_init(&cable->attr_name.attr); 837f68a8342SChanwoo Choi cable->attr_name.attr.name = "name"; 838f68a8342SChanwoo Choi cable->attr_name.attr.mode = 0444; 839f68a8342SChanwoo Choi cable->attr_name.show = cable_name_show; 840f68a8342SChanwoo Choi 841f68a8342SChanwoo Choi sysfs_attr_init(&cable->attr_state.attr); 842f68a8342SChanwoo Choi cable->attr_state.attr.name = "state"; 843f68a8342SChanwoo Choi cable->attr_state.attr.mode = 0444; 844f68a8342SChanwoo Choi cable->attr_state.show = cable_state_show; 845f68a8342SChanwoo Choi } 846f68a8342SChanwoo Choi } 847f68a8342SChanwoo Choi 848f68a8342SChanwoo Choi if (edev->max_supported && edev->mutually_exclusive) { 849f68a8342SChanwoo Choi char buf[80]; 850f68a8342SChanwoo Choi char *name; 851f68a8342SChanwoo Choi 852f68a8342SChanwoo Choi /* Count the size of mutually_exclusive array */ 853f68a8342SChanwoo Choi for (index = 0; edev->mutually_exclusive[index]; index++) 854f68a8342SChanwoo Choi ; 855f68a8342SChanwoo Choi 856f68a8342SChanwoo Choi edev->attrs_muex = kzalloc(sizeof(struct attribute *) * 857f68a8342SChanwoo Choi (index + 1), GFP_KERNEL); 858f68a8342SChanwoo Choi if (!edev->attrs_muex) { 859f68a8342SChanwoo Choi ret = -ENOMEM; 860f68a8342SChanwoo Choi goto err_muex; 861f68a8342SChanwoo Choi } 862f68a8342SChanwoo Choi 863f68a8342SChanwoo Choi edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) * 864f68a8342SChanwoo Choi index, GFP_KERNEL); 865f68a8342SChanwoo Choi if (!edev->d_attrs_muex) { 866f68a8342SChanwoo Choi ret = -ENOMEM; 867f68a8342SChanwoo Choi kfree(edev->attrs_muex); 868f68a8342SChanwoo Choi goto err_muex; 869f68a8342SChanwoo Choi } 870f68a8342SChanwoo Choi 871f68a8342SChanwoo Choi for (index = 0; edev->mutually_exclusive[index]; index++) { 872f68a8342SChanwoo Choi sprintf(buf, "0x%x", edev->mutually_exclusive[index]); 873f68a8342SChanwoo Choi name = kzalloc(sizeof(char) * (strlen(buf) + 1), 874f68a8342SChanwoo Choi GFP_KERNEL); 875f68a8342SChanwoo Choi if (!name) { 876f68a8342SChanwoo Choi for (index--; index >= 0; index--) { 877f68a8342SChanwoo Choi kfree(edev->d_attrs_muex[index].attr. 878f68a8342SChanwoo Choi name); 879f68a8342SChanwoo Choi } 880f68a8342SChanwoo Choi kfree(edev->d_attrs_muex); 881f68a8342SChanwoo Choi kfree(edev->attrs_muex); 882f68a8342SChanwoo Choi ret = -ENOMEM; 883f68a8342SChanwoo Choi goto err_muex; 884f68a8342SChanwoo Choi } 885f68a8342SChanwoo Choi strcpy(name, buf); 886f68a8342SChanwoo Choi sysfs_attr_init(&edev->d_attrs_muex[index].attr); 887f68a8342SChanwoo Choi edev->d_attrs_muex[index].attr.name = name; 888f68a8342SChanwoo Choi edev->d_attrs_muex[index].attr.mode = 0000; 889f68a8342SChanwoo Choi edev->attrs_muex[index] = &edev->d_attrs_muex[index] 890f68a8342SChanwoo Choi .attr; 891f68a8342SChanwoo Choi } 892f68a8342SChanwoo Choi edev->attr_g_muex.name = muex_name; 893f68a8342SChanwoo Choi edev->attr_g_muex.attrs = edev->attrs_muex; 894f68a8342SChanwoo Choi 895f68a8342SChanwoo Choi } 896f68a8342SChanwoo Choi 897f68a8342SChanwoo Choi if (edev->max_supported) { 898f68a8342SChanwoo Choi edev->extcon_dev_type.groups = 899f68a8342SChanwoo Choi kzalloc(sizeof(struct attribute_group *) * 900f68a8342SChanwoo Choi (edev->max_supported + 2), GFP_KERNEL); 901f68a8342SChanwoo Choi if (!edev->extcon_dev_type.groups) { 902f68a8342SChanwoo Choi ret = -ENOMEM; 903f68a8342SChanwoo Choi goto err_alloc_groups; 904f68a8342SChanwoo Choi } 905f68a8342SChanwoo Choi 906f68a8342SChanwoo Choi edev->extcon_dev_type.name = dev_name(&edev->dev); 907f68a8342SChanwoo Choi edev->extcon_dev_type.release = dummy_sysfs_dev_release; 908f68a8342SChanwoo Choi 909f68a8342SChanwoo Choi for (index = 0; index < edev->max_supported; index++) 910f68a8342SChanwoo Choi edev->extcon_dev_type.groups[index] = 911f68a8342SChanwoo Choi &edev->cables[index].attr_g; 912f68a8342SChanwoo Choi if (edev->mutually_exclusive) 913f68a8342SChanwoo Choi edev->extcon_dev_type.groups[index] = 914f68a8342SChanwoo Choi &edev->attr_g_muex; 915f68a8342SChanwoo Choi 916f68a8342SChanwoo Choi edev->dev.type = &edev->extcon_dev_type; 917f68a8342SChanwoo Choi } 918f68a8342SChanwoo Choi 919f68a8342SChanwoo Choi ret = device_register(&edev->dev); 920f68a8342SChanwoo Choi if (ret) { 921f68a8342SChanwoo Choi put_device(&edev->dev); 922f68a8342SChanwoo Choi goto err_dev; 923f68a8342SChanwoo Choi } 924f68a8342SChanwoo Choi #if defined(CONFIG_ANDROID) 925f68a8342SChanwoo Choi if (switch_class) 926f68a8342SChanwoo Choi ret = class_compat_create_link(switch_class, &edev->dev, NULL); 927f68a8342SChanwoo Choi #endif /* CONFIG_ANDROID */ 928f68a8342SChanwoo Choi 929f68a8342SChanwoo Choi spin_lock_init(&edev->lock); 930f68a8342SChanwoo Choi 931046050f6SChanwoo Choi edev->nh = devm_kzalloc(&edev->dev, 932046050f6SChanwoo Choi sizeof(*edev->nh) * edev->max_supported, GFP_KERNEL); 933046050f6SChanwoo Choi if (!edev->nh) { 934046050f6SChanwoo Choi ret = -ENOMEM; 935046050f6SChanwoo Choi goto err_dev; 936046050f6SChanwoo Choi } 937046050f6SChanwoo Choi 938046050f6SChanwoo Choi for (index = 0; index < edev->max_supported; index++) 939046050f6SChanwoo Choi RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]); 940f68a8342SChanwoo Choi 941f68a8342SChanwoo Choi dev_set_drvdata(&edev->dev, edev); 942f68a8342SChanwoo Choi edev->state = 0; 943f68a8342SChanwoo Choi 944f68a8342SChanwoo Choi mutex_lock(&extcon_dev_list_lock); 945f68a8342SChanwoo Choi list_add(&edev->entry, &extcon_dev_list); 946f68a8342SChanwoo Choi mutex_unlock(&extcon_dev_list_lock); 947f68a8342SChanwoo Choi 948f68a8342SChanwoo Choi return 0; 949f68a8342SChanwoo Choi 950f68a8342SChanwoo Choi err_dev: 951f68a8342SChanwoo Choi if (edev->max_supported) 952f68a8342SChanwoo Choi kfree(edev->extcon_dev_type.groups); 953f68a8342SChanwoo Choi err_alloc_groups: 954f68a8342SChanwoo Choi if (edev->max_supported && edev->mutually_exclusive) { 955f68a8342SChanwoo Choi for (index = 0; edev->mutually_exclusive[index]; index++) 956f68a8342SChanwoo Choi kfree(edev->d_attrs_muex[index].attr.name); 957f68a8342SChanwoo Choi kfree(edev->d_attrs_muex); 958f68a8342SChanwoo Choi kfree(edev->attrs_muex); 959f68a8342SChanwoo Choi } 960f68a8342SChanwoo Choi err_muex: 961f68a8342SChanwoo Choi for (index = 0; index < edev->max_supported; index++) 962f68a8342SChanwoo Choi kfree(edev->cables[index].attr_g.name); 963f68a8342SChanwoo Choi err_alloc_cables: 964f68a8342SChanwoo Choi if (edev->max_supported) 965f68a8342SChanwoo Choi kfree(edev->cables); 966f68a8342SChanwoo Choi err_sysfs_alloc: 967f68a8342SChanwoo Choi return ret; 968f68a8342SChanwoo Choi } 969f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_dev_register); 970f68a8342SChanwoo Choi 971f68a8342SChanwoo Choi /** 972f68a8342SChanwoo Choi * extcon_dev_unregister() - Unregister the extcon device. 973f68a8342SChanwoo Choi * @edev: the extcon device instance to be unregistered. 974f68a8342SChanwoo Choi * 975f68a8342SChanwoo Choi * Note that this does not call kfree(edev) because edev was not allocated 976f68a8342SChanwoo Choi * by this class. 977f68a8342SChanwoo Choi */ 978f68a8342SChanwoo Choi void extcon_dev_unregister(struct extcon_dev *edev) 979f68a8342SChanwoo Choi { 980f68a8342SChanwoo Choi int index; 981f68a8342SChanwoo Choi 9827eae43aeSChanwoo Choi if (!edev) 9837eae43aeSChanwoo Choi return; 9847eae43aeSChanwoo Choi 985f68a8342SChanwoo Choi mutex_lock(&extcon_dev_list_lock); 986f68a8342SChanwoo Choi list_del(&edev->entry); 987f68a8342SChanwoo Choi mutex_unlock(&extcon_dev_list_lock); 988f68a8342SChanwoo Choi 989f68a8342SChanwoo Choi if (IS_ERR_OR_NULL(get_device(&edev->dev))) { 990f68a8342SChanwoo Choi dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n", 991f68a8342SChanwoo Choi dev_name(&edev->dev)); 992f68a8342SChanwoo Choi return; 993f68a8342SChanwoo Choi } 994f68a8342SChanwoo Choi 995f68a8342SChanwoo Choi device_unregister(&edev->dev); 996f68a8342SChanwoo Choi 997f68a8342SChanwoo Choi if (edev->mutually_exclusive && edev->max_supported) { 998f68a8342SChanwoo Choi for (index = 0; edev->mutually_exclusive[index]; 999f68a8342SChanwoo Choi index++) 1000f68a8342SChanwoo Choi kfree(edev->d_attrs_muex[index].attr.name); 1001f68a8342SChanwoo Choi kfree(edev->d_attrs_muex); 1002f68a8342SChanwoo Choi kfree(edev->attrs_muex); 1003f68a8342SChanwoo Choi } 1004f68a8342SChanwoo Choi 1005f68a8342SChanwoo Choi for (index = 0; index < edev->max_supported; index++) 1006f68a8342SChanwoo Choi kfree(edev->cables[index].attr_g.name); 1007f68a8342SChanwoo Choi 1008f68a8342SChanwoo Choi if (edev->max_supported) { 1009f68a8342SChanwoo Choi kfree(edev->extcon_dev_type.groups); 1010f68a8342SChanwoo Choi kfree(edev->cables); 1011f68a8342SChanwoo Choi } 1012f68a8342SChanwoo Choi 1013f68a8342SChanwoo Choi #if defined(CONFIG_ANDROID) 1014f68a8342SChanwoo Choi if (switch_class) 1015f68a8342SChanwoo Choi class_compat_remove_link(switch_class, &edev->dev, NULL); 1016f68a8342SChanwoo Choi #endif 1017f68a8342SChanwoo Choi put_device(&edev->dev); 1018f68a8342SChanwoo Choi } 1019f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_dev_unregister); 1020f68a8342SChanwoo Choi 1021f68a8342SChanwoo Choi static void devm_extcon_dev_unreg(struct device *dev, void *res) 1022f68a8342SChanwoo Choi { 1023f68a8342SChanwoo Choi extcon_dev_unregister(*(struct extcon_dev **)res); 1024f68a8342SChanwoo Choi } 1025f68a8342SChanwoo Choi 1026f68a8342SChanwoo Choi /** 1027f68a8342SChanwoo Choi * devm_extcon_dev_register() - Resource-managed extcon_dev_register() 1028f68a8342SChanwoo Choi * @dev: device to allocate extcon device 1029f68a8342SChanwoo Choi * @edev: the new extcon device to register 1030f68a8342SChanwoo Choi * 1031f68a8342SChanwoo Choi * Managed extcon_dev_register() function. If extcon device is attached with 1032f68a8342SChanwoo Choi * this function, that extcon device is automatically unregistered on driver 1033f68a8342SChanwoo Choi * detach. Internally this function calls extcon_dev_register() function. 1034f68a8342SChanwoo Choi * To get more information, refer that function. 1035f68a8342SChanwoo Choi * 1036f68a8342SChanwoo Choi * If extcon device is registered with this function and the device needs to be 1037f68a8342SChanwoo Choi * unregistered separately, devm_extcon_dev_unregister() should be used. 1038f68a8342SChanwoo Choi * 1039f68a8342SChanwoo Choi * Returns 0 if success or negaive error number if failure. 1040f68a8342SChanwoo Choi */ 1041f68a8342SChanwoo Choi int devm_extcon_dev_register(struct device *dev, struct extcon_dev *edev) 1042f68a8342SChanwoo Choi { 1043f68a8342SChanwoo Choi struct extcon_dev **ptr; 1044f68a8342SChanwoo Choi int ret; 1045f68a8342SChanwoo Choi 1046f68a8342SChanwoo Choi ptr = devres_alloc(devm_extcon_dev_unreg, sizeof(*ptr), GFP_KERNEL); 1047f68a8342SChanwoo Choi if (!ptr) 1048f68a8342SChanwoo Choi return -ENOMEM; 1049f68a8342SChanwoo Choi 1050f68a8342SChanwoo Choi ret = extcon_dev_register(edev); 1051f68a8342SChanwoo Choi if (ret) { 1052f68a8342SChanwoo Choi devres_free(ptr); 1053f68a8342SChanwoo Choi return ret; 1054f68a8342SChanwoo Choi } 1055f68a8342SChanwoo Choi 1056f68a8342SChanwoo Choi *ptr = edev; 1057f68a8342SChanwoo Choi devres_add(dev, ptr); 1058f68a8342SChanwoo Choi 1059f68a8342SChanwoo Choi return 0; 1060f68a8342SChanwoo Choi } 1061f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(devm_extcon_dev_register); 1062f68a8342SChanwoo Choi 1063f68a8342SChanwoo Choi /** 1064f68a8342SChanwoo Choi * devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister() 1065f68a8342SChanwoo Choi * @dev: device the extcon belongs to 1066f68a8342SChanwoo Choi * @edev: the extcon device to unregister 1067f68a8342SChanwoo Choi * 1068f68a8342SChanwoo Choi * Unregister extcon device that is registered with devm_extcon_dev_register() 1069f68a8342SChanwoo Choi * function. 1070f68a8342SChanwoo Choi */ 1071f68a8342SChanwoo Choi void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev) 1072f68a8342SChanwoo Choi { 1073f68a8342SChanwoo Choi WARN_ON(devres_release(dev, devm_extcon_dev_unreg, 1074f68a8342SChanwoo Choi devm_extcon_dev_match, edev)); 1075f68a8342SChanwoo Choi } 1076f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister); 1077f68a8342SChanwoo Choi 1078f68a8342SChanwoo Choi #ifdef CONFIG_OF 1079f68a8342SChanwoo Choi /* 1080f68a8342SChanwoo Choi * extcon_get_edev_by_phandle - Get the extcon device from devicetree 1081f68a8342SChanwoo Choi * @dev - instance to the given device 1082f68a8342SChanwoo Choi * @index - index into list of extcon_dev 1083f68a8342SChanwoo Choi * 1084f68a8342SChanwoo Choi * return the instance of extcon device 1085f68a8342SChanwoo Choi */ 1086f68a8342SChanwoo Choi struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) 1087f68a8342SChanwoo Choi { 1088f68a8342SChanwoo Choi struct device_node *node; 1089f68a8342SChanwoo Choi struct extcon_dev *edev; 1090f68a8342SChanwoo Choi 10917eae43aeSChanwoo Choi if (!dev) 10927eae43aeSChanwoo Choi return ERR_PTR(-EINVAL); 10937eae43aeSChanwoo Choi 1094f68a8342SChanwoo Choi if (!dev->of_node) { 1095f68a8342SChanwoo Choi dev_err(dev, "device does not have a device node entry\n"); 1096f68a8342SChanwoo Choi return ERR_PTR(-EINVAL); 1097f68a8342SChanwoo Choi } 1098f68a8342SChanwoo Choi 1099f68a8342SChanwoo Choi node = of_parse_phandle(dev->of_node, "extcon", index); 1100f68a8342SChanwoo Choi if (!node) { 1101f68a8342SChanwoo Choi dev_err(dev, "failed to get phandle in %s node\n", 1102f68a8342SChanwoo Choi dev->of_node->full_name); 1103f68a8342SChanwoo Choi return ERR_PTR(-ENODEV); 1104f68a8342SChanwoo Choi } 1105f68a8342SChanwoo Choi 1106f68a8342SChanwoo Choi mutex_lock(&extcon_dev_list_lock); 1107f68a8342SChanwoo Choi list_for_each_entry(edev, &extcon_dev_list, entry) { 1108f68a8342SChanwoo Choi if (edev->dev.parent && edev->dev.parent->of_node == node) { 1109f68a8342SChanwoo Choi mutex_unlock(&extcon_dev_list_lock); 1110f68a8342SChanwoo Choi return edev; 1111f68a8342SChanwoo Choi } 1112f68a8342SChanwoo Choi } 1113f68a8342SChanwoo Choi mutex_unlock(&extcon_dev_list_lock); 1114f68a8342SChanwoo Choi 1115f68a8342SChanwoo Choi return ERR_PTR(-EPROBE_DEFER); 1116f68a8342SChanwoo Choi } 1117f68a8342SChanwoo Choi #else 1118f68a8342SChanwoo Choi struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) 1119f68a8342SChanwoo Choi { 1120f68a8342SChanwoo Choi return ERR_PTR(-ENOSYS); 1121f68a8342SChanwoo Choi } 1122f68a8342SChanwoo Choi #endif /* CONFIG_OF */ 1123f68a8342SChanwoo Choi EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle); 1124f68a8342SChanwoo Choi 1125707d7550SChanwoo Choi /** 1126707d7550SChanwoo Choi * extcon_get_edev_name() - Get the name of the extcon device. 1127707d7550SChanwoo Choi * @edev: the extcon device 1128707d7550SChanwoo Choi */ 1129707d7550SChanwoo Choi const char *extcon_get_edev_name(struct extcon_dev *edev) 1130707d7550SChanwoo Choi { 1131707d7550SChanwoo Choi return !edev ? NULL : edev->name; 1132707d7550SChanwoo Choi } 1133707d7550SChanwoo Choi 1134f68a8342SChanwoo Choi static int __init extcon_class_init(void) 1135f68a8342SChanwoo Choi { 1136f68a8342SChanwoo Choi return create_extcon_class(); 1137f68a8342SChanwoo Choi } 1138f68a8342SChanwoo Choi module_init(extcon_class_init); 1139f68a8342SChanwoo Choi 1140f68a8342SChanwoo Choi static void __exit extcon_class_exit(void) 1141f68a8342SChanwoo Choi { 1142f68a8342SChanwoo Choi #if defined(CONFIG_ANDROID) 1143f68a8342SChanwoo Choi class_compat_unregister(switch_class); 1144f68a8342SChanwoo Choi #endif 1145f68a8342SChanwoo Choi class_destroy(extcon_class); 1146f68a8342SChanwoo Choi } 1147f68a8342SChanwoo Choi module_exit(extcon_class_exit); 1148f68a8342SChanwoo Choi 11492a9de9c0SChanwoo Choi MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>"); 1150f68a8342SChanwoo Choi MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); 1151f68a8342SChanwoo Choi MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); 1152f68a8342SChanwoo Choi MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); 1153f68a8342SChanwoo Choi MODULE_DESCRIPTION("External connector (extcon) class driver"); 1154f68a8342SChanwoo Choi MODULE_LICENSE("GPL"); 1155