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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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External Connector (extcon) framework. * * Copyright (C) 2015 Samsung Electronics * Author: Chanwoo Choi <cw00.choi@samsung.com> * * Copyright (C) 2012 Samsung Electronics * Author: Donggeun Kim <dg77.kim@samsung.com> * Author: MyungJoo Ham <myungjoo.ham@samsung.com> * * based on android/drivers/switch/switch_class.c * Copyright (C) 2008 Google, Inc. * Author: Mike Lockwood <lockwood@android.com> */
#include <linux/module.h>#include <linux/types.h>#include <linux/idr.h>#include <linux/init.h>#include <linux/device.h>#include <linux/fs.h>#include <linux/err.h>#include <linux/of.h>#include <linux/slab.h>#include <linux/sysfs.h>
#include "extcon.h"
#define SUPPORTED_CABLE_MAX 32
static const struct __extcon_info { unsigned int type; unsigned int id; const char *name;
} extcon_info[] = { [EXTCON_NONE] = { .type = EXTCON_TYPE_MISC, .id = EXTCON_NONE, .name = "NONE", },
/* USB external connector */ [EXTCON_USB] = { .type = EXTCON_TYPE_USB, .id = EXTCON_USB, .name = "USB", }, [EXTCON_USB_HOST] = { .type = EXTCON_TYPE_USB, .id = EXTCON_USB_HOST, .name = "USB-HOST", },
/* Charging external connector */ [EXTCON_CHG_USB_SDP] = { .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, .id = EXTCON_CHG_USB_SDP, .name = "SDP", }, [EXTCON_CHG_USB_DCP] = { .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, .id = EXTCON_CHG_USB_DCP, .name = "DCP", }, [EXTCON_CHG_USB_CDP] = { .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, .id = EXTCON_CHG_USB_CDP, .name = "CDP", }, [EXTCON_CHG_USB_ACA] = { .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, .id = EXTCON_CHG_USB_ACA, .name = "ACA", }, [EXTCON_CHG_USB_FAST] = { .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, .id = EXTCON_CHG_USB_FAST, .name = "FAST-CHARGER", }, [EXTCON_CHG_USB_SLOW] = { .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, .id = EXTCON_CHG_USB_SLOW, .name = "SLOW-CHARGER", }, [EXTCON_CHG_WPT] = { .type = EXTCON_TYPE_CHG, .id = EXTCON_CHG_WPT, .name = "WPT", }, [EXTCON_CHG_USB_PD] = { .type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB, .id = EXTCON_CHG_USB_PD, .name = "PD", },
/* Jack external connector */ [EXTCON_JACK_MICROPHONE] = { .type = EXTCON_TYPE_JACK, .id = EXTCON_JACK_MICROPHONE, .name = "MICROPHONE", }, [EXTCON_JACK_HEADPHONE] = { .type = EXTCON_TYPE_JACK, .id = EXTCON_JACK_HEADPHONE, .name = "HEADPHONE", }, [EXTCON_JACK_LINE_IN] = { .type = EXTCON_TYPE_JACK, .id = EXTCON_JACK_LINE_IN, .name = "LINE-IN", }, [EXTCON_JACK_LINE_OUT] = { .type = EXTCON_TYPE_JACK, .id = EXTCON_JACK_LINE_OUT, .name = "LINE-OUT", }, [EXTCON_JACK_VIDEO_IN] = { .type = EXTCON_TYPE_JACK, .id = EXTCON_JACK_VIDEO_IN, .name = "VIDEO-IN", }, [EXTCON_JACK_VIDEO_OUT] = { .type = EXTCON_TYPE_JACK, .id = EXTCON_JACK_VIDEO_OUT, .name = "VIDEO-OUT", }, [EXTCON_JACK_SPDIF_IN] = { .type = EXTCON_TYPE_JACK, .id = EXTCON_JACK_SPDIF_IN, .name = "SPDIF-IN", }, [EXTCON_JACK_SPDIF_OUT] = { .type = EXTCON_TYPE_JACK, .id = EXTCON_JACK_SPDIF_OUT, .name = "SPDIF-OUT", },
/* Display external connector */ [EXTCON_DISP_HDMI] = { .type = EXTCON_TYPE_DISP, .id = EXTCON_DISP_HDMI, .name = "HDMI", }, [EXTCON_DISP_MHL] = { .type = EXTCON_TYPE_DISP, .id = EXTCON_DISP_MHL, .name = "MHL", }, [EXTCON_DISP_DVI] = { .type = EXTCON_TYPE_DISP, .id = EXTCON_DISP_DVI, .name = "DVI", }, [EXTCON_DISP_VGA] = { .type = EXTCON_TYPE_DISP, .id = EXTCON_DISP_VGA, .name = "VGA", }, [EXTCON_DISP_DP] = { .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB, .id = EXTCON_DISP_DP, .name = "DP", }, [EXTCON_DISP_HMD] = { .type = EXTCON_TYPE_DISP | EXTCON_TYPE_USB, .id = EXTCON_DISP_HMD, .name = "HMD", }, [EXTCON_DISP_CVBS] = { .type = EXTCON_TYPE_DISP, .id = EXTCON_DISP_CVBS, .name = "CVBS", }, [EXTCON_DISP_EDP] = { .type = EXTCON_TYPE_DISP, .id = EXTCON_DISP_EDP, .name = "EDP", },
/* Miscellaneous external connector */ [EXTCON_DOCK] = { .type = EXTCON_TYPE_MISC, .id = EXTCON_DOCK, .name = "DOCK", }, [EXTCON_JIG] = { .type = EXTCON_TYPE_MISC, .id = EXTCON_JIG, .name = "JIG", }, [EXTCON_MECHANICAL] = { .type = EXTCON_TYPE_MISC, .id = EXTCON_MECHANICAL, .name = "MECHANICAL", },
{ /* sentinel */ }};
/** * struct extcon_cable - An internal data for an external connector. * @edev: the extcon device * @cable_index: the index of this cable in the edev * @attr_g: the attribute group for the cable * @attr_name: "name" sysfs entry * @attr_state: "state" sysfs entry * @attrs: the array pointing to attr_name and attr_state for attr_g * @usb_propval: the array of USB connector properties * @chg_propval: the array of charger connector properties * @jack_propval: the array of jack connector properties * @disp_propval: the array of display connector properties * @usb_bits: the bit array of the USB connector property capabilities * @chg_bits: the bit array of the charger connector property capabilities * @jack_bits: the bit array of the jack connector property capabilities * @disp_bits: the bit array of the display connector property capabilities */struct extcon_cable { struct extcon_dev *edev; int cable_index;
struct attribute_group attr_g; struct device_attribute attr_name; struct device_attribute attr_state;
struct attribute *attrs[3]; /* to be fed to attr_g.attrs */
union extcon_property_value usb_propval[EXTCON_PROP_USB_CNT]; union extcon_property_value chg_propval[EXTCON_PROP_CHG_CNT]; union extcon_property_value jack_propval[EXTCON_PROP_JACK_CNT]; union extcon_property_value disp_propval[EXTCON_PROP_DISP_CNT];
DECLARE_BITMAP(usb_bits, EXTCON_PROP_USB_CNT); DECLARE_BITMAP(chg_bits, EXTCON_PROP_CHG_CNT); DECLARE_BITMAP(jack_bits, EXTCON_PROP_JACK_CNT); DECLARE_BITMAP(disp_bits, EXTCON_PROP_DISP_CNT);};
static struct class *extcon_class;
static DEFINE_IDA(extcon_dev_ids);static LIST_HEAD(extcon_dev_list);static DEFINE_MUTEX(extcon_dev_list_lock);
static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state){ int i;
if (!edev->mutually_exclusive) return 0;
for (i = 0; edev->mutually_exclusive[i]; i++) { int weight; u32 correspondants = new_state & edev->mutually_exclusive[i];
/* calculate the total number of bits set */ weight = hweight32(correspondants); if (weight > 1) return i + 1; }
return 0;}
static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id){ int i;
/* Find the index of extcon cable in edev->supported_cable */ for (i = 0; i < edev->max_supported; i++) { if (edev->supported_cable[i] == id) return i; }
return -EINVAL;}
static int get_extcon_type(unsigned int prop){ switch (prop) { case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: return EXTCON_TYPE_USB; case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: return EXTCON_TYPE_CHG; case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: return EXTCON_TYPE_JACK; case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: return EXTCON_TYPE_DISP; default: return -EINVAL; }}
static bool is_extcon_attached(struct extcon_dev *edev, unsigned int index){ return !!(edev->state & BIT(index));}
static bool is_extcon_changed(struct extcon_dev *edev, int index, bool new_state){ int state = !!(edev->state & BIT(index)); return (state != new_state);}
static bool is_extcon_property_supported(unsigned int id, unsigned int prop){ int type;
/* Check whether the property is supported or not. */ type = get_extcon_type(prop); if (type < 0) return false;
/* Check whether a specific extcon id supports the property or not. */ return !!(extcon_info[id].type & type);}
static int is_extcon_property_capability(struct extcon_dev *edev, unsigned int id, int index,unsigned int prop){ struct extcon_cable *cable; int type, ret;
/* Check whether the property is supported or not. */ type = get_extcon_type(prop); if (type < 0) return type;
cable = &edev->cables[index];
switch (type) { case EXTCON_TYPE_USB: ret = test_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits); break; case EXTCON_TYPE_CHG: ret = test_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits); break; case EXTCON_TYPE_JACK: ret = test_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits); break; case EXTCON_TYPE_DISP: ret = test_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits); break; default: ret = -EINVAL; }
return ret;}
static void init_property(struct extcon_dev *edev, unsigned int id, int index){ unsigned int type = extcon_info[id].type; struct extcon_cable *cable = &edev->cables[index];
if (EXTCON_TYPE_USB & type) memset(cable->usb_propval, 0, sizeof(cable->usb_propval)); if (EXTCON_TYPE_CHG & type) memset(cable->chg_propval, 0, sizeof(cable->chg_propval)); if (EXTCON_TYPE_JACK & type) memset(cable->jack_propval, 0, sizeof(cable->jack_propval)); if (EXTCON_TYPE_DISP & type) memset(cable->disp_propval, 0, sizeof(cable->disp_propval));}
static ssize_t state_show(struct device *dev, struct device_attribute *attr, char *buf){ int i, count = 0; struct extcon_dev *edev = dev_get_drvdata(dev);
if (edev->max_supported == 0) return sysfs_emit(buf, "%u\n", edev->state);
for (i = 0; i < edev->max_supported; i++) { count += sysfs_emit_at(buf, count, "%s=%d\n", extcon_info[edev->supported_cable[i]].name, !!(edev->state & BIT(i))); }
return count;}static DEVICE_ATTR_RO(state);
static ssize_t name_show(struct device *dev, struct device_attribute *attr, char *buf){ struct extcon_dev *edev = dev_get_drvdata(dev);
return sysfs_emit(buf, "%s\n", edev->name);}static DEVICE_ATTR_RO(name);
static ssize_t cable_name_show(struct device *dev, struct device_attribute *attr, char *buf){ struct extcon_cable *cable = container_of(attr, struct extcon_cable, attr_name); int i = cable->cable_index;
return sysfs_emit(buf, "%s\n", extcon_info[cable->edev->supported_cable[i]].name);}
static ssize_t cable_state_show(struct device *dev, struct device_attribute *attr, char *buf){ struct extcon_cable *cable = container_of(attr, struct extcon_cable, attr_state);
int i = cable->cable_index;
return sysfs_emit(buf, "%d\n", extcon_get_state(cable->edev, cable->edev->supported_cable[i]));}
/** * extcon_sync() - Synchronize the state for an external connector. * @edev: the extcon device * @id: the unique id indicating an external connector * * Note that this function send a notification in order to synchronize * the state and property of an external connector. * * Returns 0 if success or error number if fail. */int extcon_sync(struct extcon_dev *edev, unsigned int id){ char name_buf[120]; char state_buf[120]; char *prop_buf; char *envp[3]; int env_offset = 0; int length; int index; int state; unsigned long flags;
if (!edev) return -EINVAL;
index = find_cable_index_by_id(edev, id); if (index < 0) return index;
spin_lock_irqsave(&edev->lock, flags); state = !!(edev->state & BIT(index)); spin_unlock_irqrestore(&edev->lock, flags);
/* * Call functions in a raw notifier chain for the specific one * external connector. */ raw_notifier_call_chain(&edev->nh[index], state, edev);
/* * Call functions in a raw notifier chain for the all supported * external connectors. */ raw_notifier_call_chain(&edev->nh_all, state, edev);
spin_lock_irqsave(&edev->lock, flags); /* This could be in interrupt handler */ prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); if (!prop_buf) { /* Unlock early before uevent */ spin_unlock_irqrestore(&edev->lock, flags);
dev_err(&edev->dev, "out of memory in extcon_set_state\n"); kobject_uevent(&edev->dev.kobj, KOBJ_CHANGE);
return -ENOMEM; }
length = name_show(&edev->dev, NULL, prop_buf); if (length > 0) { if (prop_buf[length - 1] == '\n') prop_buf[length - 1] = 0; snprintf(name_buf, sizeof(name_buf), "NAME=%s", prop_buf); envp[env_offset++] = name_buf; }
length = state_show(&edev->dev, NULL, prop_buf); if (length > 0) { if (prop_buf[length - 1] == '\n') prop_buf[length - 1] = 0; snprintf(state_buf, sizeof(state_buf), "STATE=%s", prop_buf); envp[env_offset++] = state_buf; } envp[env_offset] = NULL;
/* Unlock early before uevent */ spin_unlock_irqrestore(&edev->lock, flags); kobject_uevent_env(&edev->dev.kobj, KOBJ_CHANGE, envp); free_page((unsigned long)prop_buf);
return 0;}EXPORT_SYMBOL_GPL(extcon_sync);
/** * extcon_get_state() - Get the state of an external connector. * @edev: the extcon device * @id: the unique id indicating an external connector * * Returns 0 if success or error number if fail. */int extcon_get_state(struct extcon_dev *edev, const unsigned int id){ int index, state; unsigned long flags;
if (!edev) return -EINVAL;
index = find_cable_index_by_id(edev, id); if (index < 0) return index;
spin_lock_irqsave(&edev->lock, flags); state = is_extcon_attached(edev, index); spin_unlock_irqrestore(&edev->lock, flags);
return state;}EXPORT_SYMBOL_GPL(extcon_get_state);
/** * extcon_set_state() - Set the state of an external connector. * @edev: the extcon device * @id: the unique id indicating an external connector * @state: the new state of an external connector. * the default semantics is true: attached / false: detached. * * Note that this function set the state of an external connector without * a notification. To synchronize the state of an external connector, * have to use extcon_set_state_sync() and extcon_sync(). * * Returns 0 if success or error number if fail. */int extcon_set_state(struct extcon_dev *edev, unsigned int id, bool state){ unsigned long flags; int index, ret = 0;
if (!edev) return -EINVAL;
index = find_cable_index_by_id(edev, id); if (index < 0) return index;
spin_lock_irqsave(&edev->lock, flags);
/* Check whether the external connector's state is changed. */ if (!is_extcon_changed(edev, index, state)) goto out;
if (check_mutually_exclusive(edev, (edev->state & ~BIT(index)) | (state & BIT(index)))) { ret = -EPERM; goto out; }
/* * Initialize the value of extcon property before setting * the detached state for an external connector. */ if (!state) init_property(edev, id, index);
/* Update the state for an external connector. */ if (state) edev->state |= BIT(index); else edev->state &= ~(BIT(index));out: spin_unlock_irqrestore(&edev->lock, flags);
return ret;}EXPORT_SYMBOL_GPL(extcon_set_state);
/** * extcon_set_state_sync() - Set the state of an external connector with sync. * @edev: the extcon device * @id: the unique id indicating an external connector * @state: the new state of external connector. * the default semantics is true: attached / false: detached. * * Note that this function set the state of external connector * and synchronize the state by sending a notification. * * Returns 0 if success or error number if fail. */int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id, bool state){ int ret;
ret = extcon_set_state(edev, id, state); if (ret < 0) return ret;
return extcon_sync(edev, id);}EXPORT_SYMBOL_GPL(extcon_set_state_sync);
/** * extcon_get_property() - Get the property value of an external connector. * @edev: the extcon device * @id: the unique id indicating an external connector * @prop: the property id indicating an extcon property * @prop_val: the pointer which store the value of extcon property * * Note that when getting the property value of external connector, * the external connector should be attached. If detached state, function * return 0 without property value. Also, the each property should be * included in the list of supported properties according to extcon type. * * Returns 0 if success or error number if fail. */int extcon_get_property(struct extcon_dev *edev, unsigned int id, unsigned int prop, union extcon_property_value *prop_val){ struct extcon_cable *cable; unsigned long flags; int index, ret = 0;
*prop_val = (union extcon_property_value){0};
if (!edev) return -EINVAL;
/* Check whether the property is supported or not */ if (!is_extcon_property_supported(id, prop)) return -EINVAL;
/* Find the cable index of external connector by using id */ index = find_cable_index_by_id(edev, id); if (index < 0) return index;
spin_lock_irqsave(&edev->lock, flags);
/* Check whether the property is available or not. */ if (!is_extcon_property_capability(edev, id, index, prop)) { spin_unlock_irqrestore(&edev->lock, flags); return -EPERM; }
/* * Check whether the external connector is attached. * If external connector is detached, the user can not * get the property value. */ if (!is_extcon_attached(edev, index)) { spin_unlock_irqrestore(&edev->lock, flags); return 0; }
cable = &edev->cables[index];
/* Get the property value according to extcon type */ switch (prop) { case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: *prop_val = cable->usb_propval[prop - EXTCON_PROP_USB_MIN]; break; case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: *prop_val = cable->chg_propval[prop - EXTCON_PROP_CHG_MIN]; break; case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: *prop_val = cable->jack_propval[prop - EXTCON_PROP_JACK_MIN]; break; case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: *prop_val = cable->disp_propval[prop - EXTCON_PROP_DISP_MIN]; break; default: ret = -EINVAL; break; }
spin_unlock_irqrestore(&edev->lock, flags);
return ret;}EXPORT_SYMBOL_GPL(extcon_get_property);
/** * extcon_set_property() - Set the property value of an external connector. * @edev: the extcon device * @id: the unique id indicating an external connector * @prop: the property id indicating an extcon property * @prop_val: the pointer including the new value of extcon property * * Note that each property should be included in the list of supported * properties according to the extcon type. * * Returns 0 if success or error number if fail. */int extcon_set_property(struct extcon_dev *edev, unsigned int id, unsigned int prop, union extcon_property_value prop_val){ struct extcon_cable *cable; unsigned long flags; int index, ret = 0;
if (!edev) return -EINVAL;
/* Check whether the property is supported or not */ if (!is_extcon_property_supported(id, prop)) return -EINVAL;
/* Find the cable index of external connector by using id */ index = find_cable_index_by_id(edev, id); if (index < 0) return index;
spin_lock_irqsave(&edev->lock, flags);
/* Check whether the property is available or not. */ if (!is_extcon_property_capability(edev, id, index, prop)) { spin_unlock_irqrestore(&edev->lock, flags); return -EPERM; }
cable = &edev->cables[index];
/* Set the property value according to extcon type */ switch (prop) { case EXTCON_PROP_USB_MIN ... EXTCON_PROP_USB_MAX: cable->usb_propval[prop - EXTCON_PROP_USB_MIN] = prop_val; break; case EXTCON_PROP_CHG_MIN ... EXTCON_PROP_CHG_MAX: cable->chg_propval[prop - EXTCON_PROP_CHG_MIN] = prop_val; break; case EXTCON_PROP_JACK_MIN ... EXTCON_PROP_JACK_MAX: cable->jack_propval[prop - EXTCON_PROP_JACK_MIN] = prop_val; break; case EXTCON_PROP_DISP_MIN ... EXTCON_PROP_DISP_MAX: cable->disp_propval[prop - EXTCON_PROP_DISP_MIN] = prop_val; break; default: ret = -EINVAL; break; }
spin_unlock_irqrestore(&edev->lock, flags);
return ret;}EXPORT_SYMBOL_GPL(extcon_set_property);
/** * extcon_set_property_sync() - Set property of an external connector with sync. * @edev: the extcon device * @id: the unique id indicating an external connector * @prop: the property id indicating an extcon property * @prop_val: the pointer including the new value of extcon property * * Note that when setting the property value of external connector, * the external connector should be attached. The each property should * be included in the list of supported properties according to extcon type. * * Returns 0 if success or error number if fail. */int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id, unsigned int prop, union extcon_property_value prop_val){ int ret;
ret = extcon_set_property(edev, id, prop, prop_val); if (ret < 0) return ret;
return extcon_sync(edev, id);}EXPORT_SYMBOL_GPL(extcon_set_property_sync);
/** * extcon_get_property_capability() - Get the capability of the property * for an external connector. * @edev: the extcon device * @id: the unique id indicating an external connector * @prop: the property id indicating an extcon property * * Returns 1 if the property is available or 0 if not available. */int extcon_get_property_capability(struct extcon_dev *edev, unsigned int id, unsigned int prop){ int index;
if (!edev) return -EINVAL;
/* Check whether the property is supported or not */ if (!is_extcon_property_supported(id, prop)) return -EINVAL;
/* Find the cable index of external connector by using id */ index = find_cable_index_by_id(edev, id); if (index < 0) return index;
return is_extcon_property_capability(edev, id, index, prop);}EXPORT_SYMBOL_GPL(extcon_get_property_capability);
/** * extcon_set_property_capability() - Set the capability of the property * for an external connector. * @edev: the extcon device * @id: the unique id indicating an external connector * @prop: the property id indicating an extcon property * * Note that this function set the capability of the property * for an external connector in order to mark the bit in capability * bitmap which mean the available state of the property. * * Returns 0 if success or error number if fail. */int extcon_set_property_capability(struct extcon_dev *edev, unsigned int id, unsigned int prop){ struct extcon_cable *cable; int index, type, ret = 0;
if (!edev) return -EINVAL;
/* Check whether the property is supported or not. */ if (!is_extcon_property_supported(id, prop)) return -EINVAL;
/* Find the cable index of external connector by using id. */ index = find_cable_index_by_id(edev, id); if (index < 0) return index;
type = get_extcon_type(prop); if (type < 0) return type;
cable = &edev->cables[index];
switch (type) { case EXTCON_TYPE_USB: __set_bit(prop - EXTCON_PROP_USB_MIN, cable->usb_bits); break; case EXTCON_TYPE_CHG: __set_bit(prop - EXTCON_PROP_CHG_MIN, cable->chg_bits); break; case EXTCON_TYPE_JACK: __set_bit(prop - EXTCON_PROP_JACK_MIN, cable->jack_bits); break; case EXTCON_TYPE_DISP: __set_bit(prop - EXTCON_PROP_DISP_MIN, cable->disp_bits); break; default: ret = -EINVAL; }
return ret;}EXPORT_SYMBOL_GPL(extcon_set_property_capability);
/** * extcon_get_extcon_dev() - Get the extcon device instance from the name. * @extcon_name: the extcon name provided with extcon_dev_register() * * Return the pointer of extcon device if success or ERR_PTR(err) if fail. * NOTE: This function returns -EPROBE_DEFER so it may only be called from * probe() functions. */struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name){ struct extcon_dev *sd;
if (!extcon_name) return ERR_PTR(-EINVAL);
mutex_lock(&extcon_dev_list_lock); list_for_each_entry(sd, &extcon_dev_list, entry) { if (!strcmp(sd->name, extcon_name)) goto out; } sd = ERR_PTR(-EPROBE_DEFER);out: mutex_unlock(&extcon_dev_list_lock); return sd;}EXPORT_SYMBOL_GPL(extcon_get_extcon_dev);
/** * extcon_register_notifier() - Register a notifier block to get notified by * any state changes from the extcon. * @edev: the extcon device * @id: the unique id indicating an external connector * @nb: a notifier block to be registered * * Note that the second parameter given to the callback of nb (val) is * the current state of an external connector and the third pameter * is the pointer of extcon device. * * Returns 0 if success or error number if fail. */int extcon_register_notifier(struct extcon_dev *edev, unsigned int id, struct notifier_block *nb){ unsigned long flags; int ret, idx;
if (!edev || !nb) return -EINVAL;
idx = find_cable_index_by_id(edev, id); if (idx < 0) return idx;
spin_lock_irqsave(&edev->lock, flags); ret = raw_notifier_chain_register(&edev->nh[idx], nb); spin_unlock_irqrestore(&edev->lock, flags);
return ret;}EXPORT_SYMBOL_GPL(extcon_register_notifier);
/** * extcon_unregister_notifier() - Unregister a notifier block from the extcon. * @edev: the extcon device * @id: the unique id indicating an external connector * @nb: a notifier block to be registered * * Returns 0 if success or error number if fail. */int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id, struct notifier_block *nb){ unsigned long flags; int ret, idx;
if (!edev || !nb) return -EINVAL;
idx = find_cable_index_by_id(edev, id); if (idx < 0) return idx;
spin_lock_irqsave(&edev->lock, flags); ret = raw_notifier_chain_unregister(&edev->nh[idx], nb); spin_unlock_irqrestore(&edev->lock, flags);
return ret;}EXPORT_SYMBOL_GPL(extcon_unregister_notifier);
/** * extcon_register_notifier_all() - Register a notifier block for all connectors. * @edev: the extcon device * @nb: a notifier block to be registered * * Note that this function registers a notifier block in order to receive * the state change of all supported external connectors from extcon device. * And the second parameter given to the callback of nb (val) is * the current state and the third pameter is the pointer of extcon device. * * Returns 0 if success or error number if fail. */int extcon_register_notifier_all(struct extcon_dev *edev, struct notifier_block *nb){ unsigned long flags; int ret;
if (!edev || !nb) return -EINVAL;
spin_lock_irqsave(&edev->lock, flags); ret = raw_notifier_chain_register(&edev->nh_all, nb); spin_unlock_irqrestore(&edev->lock, flags);
return ret;}EXPORT_SYMBOL_GPL(extcon_register_notifier_all);
/** * extcon_unregister_notifier_all() - Unregister a notifier block from extcon. * @edev: the extcon device * @nb: a notifier block to be registered * * Returns 0 if success or error number if fail. */int extcon_unregister_notifier_all(struct extcon_dev *edev, struct notifier_block *nb){ unsigned long flags; int ret;
if (!edev || !nb) return -EINVAL;
spin_lock_irqsave(&edev->lock, flags); ret = raw_notifier_chain_unregister(&edev->nh_all, nb); spin_unlock_irqrestore(&edev->lock, flags);
return ret;}EXPORT_SYMBOL_GPL(extcon_unregister_notifier_all);
static struct attribute *extcon_attrs[] = { &dev_attr_state.attr, &dev_attr_name.attr, NULL,};ATTRIBUTE_GROUPS(extcon);
static int create_extcon_class(void){ if (extcon_class) return 0;
extcon_class = class_create("extcon"); if (IS_ERR(extcon_class)) return PTR_ERR(extcon_class); extcon_class->dev_groups = extcon_groups;
return 0;}
static void extcon_dev_release(struct device *dev){}
static const char *muex_name = "mutually_exclusive";static void dummy_sysfs_dev_release(struct device *dev){}
/* * extcon_dev_allocate() - Allocate the memory of extcon device. * @supported_cable: the array of the supported external connectors * ending with EXTCON_NONE. * * Note that this function allocates the memory for extcon device * and initialize default setting for the extcon device. * * Returns the pointer memory of allocated extcon_dev if success * or ERR_PTR(err) if fail. */struct extcon_dev *extcon_dev_allocate(const unsigned int *supported_cable){ struct extcon_dev *edev;
if (!supported_cable) return ERR_PTR(-EINVAL);
edev = kzalloc_obj(*edev); if (!edev) return ERR_PTR(-ENOMEM);
edev->max_supported = 0; edev->supported_cable = supported_cable;
return edev;}
/* * extcon_dev_free() - Free the memory of extcon device. * @edev: the extcon device */void extcon_dev_free(struct extcon_dev *edev){ kfree(edev);}EXPORT_SYMBOL_GPL(extcon_dev_free);
/** * extcon_alloc_cables() - alloc the cables for extcon device * @edev: extcon device which has cables * * Returns 0 if success or error number if fail. */static int extcon_alloc_cables(struct extcon_dev *edev){ int index; char *str; struct extcon_cable *cable;
if (!edev) return -EINVAL;
if (!edev->max_supported) return 0;
edev->cables = kzalloc_objs(*edev->cables, edev->max_supported); if (!edev->cables) return -ENOMEM;
for (index = 0; index < edev->max_supported; index++) { cable = &edev->cables[index];
str = kasprintf(GFP_KERNEL, "cable.%d", index); if (!str) { for (index--; index >= 0; index--) { cable = &edev->cables[index]; kfree(cable->attr_g.name); }
kfree(edev->cables); return -ENOMEM; }
cable->edev = edev; cable->cable_index = index; cable->attrs[0] = &cable->attr_name.attr; cable->attrs[1] = &cable->attr_state.attr; cable->attrs[2] = NULL; cable->attr_g.name = str; cable->attr_g.attrs = cable->attrs;
sysfs_attr_init(&cable->attr_name.attr); cable->attr_name.attr.name = "name"; cable->attr_name.attr.mode = 0444; cable->attr_name.show = cable_name_show;
sysfs_attr_init(&cable->attr_state.attr); cable->attr_state.attr.name = "state"; cable->attr_state.attr.mode = 0444; cable->attr_state.show = cable_state_show; }
return 0;}
/** * extcon_alloc_muex() - alloc the mutual exclusive for extcon device * @edev: extcon device * * Returns 0 if success or error number if fail. */static int extcon_alloc_muex(struct extcon_dev *edev){ char *name; int index;
if (!edev) return -EINVAL;
if (!(edev->max_supported && edev->mutually_exclusive)) return 0;
/* Count the size of mutually_exclusive array */ for (index = 0; edev->mutually_exclusive[index]; index++) ;
edev->attrs_muex = kzalloc_objs(*edev->attrs_muex, index + 1); if (!edev->attrs_muex) return -ENOMEM;
edev->d_attrs_muex = kzalloc_objs(*edev->d_attrs_muex, index); if (!edev->d_attrs_muex) { kfree(edev->attrs_muex); return -ENOMEM; }
for (index = 0; edev->mutually_exclusive[index]; index++) { name = kasprintf(GFP_KERNEL, "0x%x", edev->mutually_exclusive[index]); if (!name) { for (index--; index >= 0; index--) kfree(edev->d_attrs_muex[index].attr.name);
kfree(edev->d_attrs_muex); kfree(edev->attrs_muex); return -ENOMEM; } sysfs_attr_init(&edev->d_attrs_muex[index].attr); edev->d_attrs_muex[index].attr.name = name; edev->d_attrs_muex[index].attr.mode = 0000; edev->attrs_muex[index] = &edev->d_attrs_muex[index].attr; } edev->attr_g_muex.name = muex_name; edev->attr_g_muex.attrs = edev->attrs_muex;
return 0;}
/** * extcon_alloc_groups() - alloc the groups for extcon device * @edev: extcon device * * Returns 0 if success or error number if fail. */static int extcon_alloc_groups(struct extcon_dev *edev){ int index;
if (!edev) return -EINVAL;
if (!edev->max_supported) return 0;
edev->extcon_dev_type.groups = kzalloc_objs(*edev->extcon_dev_type.groups, edev->max_supported + 2); if (!edev->extcon_dev_type.groups) return -ENOMEM;
edev->extcon_dev_type.name = dev_name(&edev->dev); edev->extcon_dev_type.release = dummy_sysfs_dev_release;
for (index = 0; index < edev->max_supported; index++) edev->extcon_dev_type.groups[index] = &edev->cables[index].attr_g;
if (edev->mutually_exclusive) edev->extcon_dev_type.groups[index] = &edev->attr_g_muex;
edev->dev.type = &edev->extcon_dev_type;
return 0;}
/** * extcon_dev_register() - Register an new extcon device * @edev: the extcon device to be registered * * Among the members of edev struct, please set the "user initializing data" * do not set the values of "internal data", which are initialized by * this function. * * Note that before calling this funciton, have to allocate the memory * of an extcon device by using the extcon_dev_allocate(). And the extcon * dev should include the supported_cable information. * * Returns 0 if success or error number if fail. */int extcon_dev_register(struct extcon_dev *edev){ int ret, index;
ret = create_extcon_class(); if (ret < 0) return ret;
if (!edev || !edev->supported_cable) return -EINVAL;
for (index = 0; edev->supported_cable[index] != EXTCON_NONE; index++);
edev->max_supported = index; if (index > SUPPORTED_CABLE_MAX) { dev_err(&edev->dev, "exceed the maximum number of supported cables\n"); return -EINVAL; }
edev->dev.class = extcon_class; edev->dev.release = extcon_dev_release;
edev->name = dev_name(edev->dev.parent); if (IS_ERR_OR_NULL(edev->name)) { dev_err(&edev->dev, "extcon device name is null\n"); return -EINVAL; }
ret = ida_alloc(&extcon_dev_ids, GFP_KERNEL); if (ret < 0) return ret;
edev->id = ret;
ret = extcon_alloc_cables(edev); if (ret < 0) goto err_alloc_cables;
ret = extcon_alloc_muex(edev); if (ret < 0) goto err_alloc_muex;
ret = extcon_alloc_groups(edev); if (ret < 0) goto err_alloc_groups;
spin_lock_init(&edev->lock); if (edev->max_supported) { edev->nh = kzalloc_objs(*edev->nh, edev->max_supported); if (!edev->nh) { ret = -ENOMEM; goto err_alloc_nh; } }
for (index = 0; index < edev->max_supported; index++) RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]);
RAW_INIT_NOTIFIER_HEAD(&edev->nh_all);
dev_set_drvdata(&edev->dev, edev); dev_set_name(&edev->dev, "extcon%d", edev->id); edev->state = 0;
ret = device_register(&edev->dev); if (ret) { put_device(&edev->dev); goto err_dev; }
mutex_lock(&extcon_dev_list_lock); list_add(&edev->entry, &extcon_dev_list); mutex_unlock(&extcon_dev_list_lock);
return 0;
err_dev: if (edev->max_supported) kfree(edev->nh);err_alloc_nh: if (edev->max_supported) kfree(edev->extcon_dev_type.groups);err_alloc_groups: if (edev->max_supported && edev->mutually_exclusive) { for (index = 0; edev->mutually_exclusive[index]; index++) kfree(edev->d_attrs_muex[index].attr.name); kfree(edev->d_attrs_muex); kfree(edev->attrs_muex); }err_alloc_muex: for (index = 0; index < edev->max_supported; index++) kfree(edev->cables[index].attr_g.name); if (edev->max_supported) kfree(edev->cables);err_alloc_cables: ida_free(&extcon_dev_ids, edev->id);
return ret;}EXPORT_SYMBOL_GPL(extcon_dev_register);
/** * extcon_dev_unregister() - Unregister the extcon device. * @edev: the extcon device to be unregistered. * * Note that this does not call kfree(edev) because edev was not allocated * by this class. */void extcon_dev_unregister(struct extcon_dev *edev){ int index;
if (!edev) return;
mutex_lock(&extcon_dev_list_lock); list_del(&edev->entry); mutex_unlock(&extcon_dev_list_lock);
if (!get_device(&edev->dev)) { dev_err(&edev->dev, "Failed to unregister extcon_dev\n"); return; }
device_unregister(&edev->dev);
ida_free(&extcon_dev_ids, edev->id);
if (edev->mutually_exclusive && edev->max_supported) { for (index = 0; edev->mutually_exclusive[index]; index++) kfree(edev->d_attrs_muex[index].attr.name); kfree(edev->d_attrs_muex); kfree(edev->attrs_muex); }
for (index = 0; index < edev->max_supported; index++) kfree(edev->cables[index].attr_g.name);
if (edev->max_supported) { kfree(edev->extcon_dev_type.groups); kfree(edev->cables); kfree(edev->nh); }
put_device(&edev->dev);}EXPORT_SYMBOL_GPL(extcon_dev_unregister);
#ifdef CONFIG_OF
/* * extcon_find_edev_by_node - Find the extcon device from devicetree. * @node : OF node identifying edev * * Return the pointer of extcon device if success or ERR_PTR(err) if fail. */struct extcon_dev *extcon_find_edev_by_node(struct device_node *node){ struct extcon_dev *edev;
mutex_lock(&extcon_dev_list_lock); list_for_each_entry(edev, &extcon_dev_list, entry) if (edev->dev.parent && device_match_of_node(edev->dev.parent, node)) goto out; edev = ERR_PTR(-EPROBE_DEFER);out: mutex_unlock(&extcon_dev_list_lock);
return edev;}
/* * extcon_get_edev_by_phandle - Get the extcon device from devicetree. * @dev : the instance to the given device * @index : the index into list of extcon_dev * * Return the pointer of extcon device if success or ERR_PTR(err) if fail. */struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index){ struct device_node *node, *np = dev_of_node(dev); struct extcon_dev *edev;
if (!np) { dev_dbg(dev, "device does not have a device node entry\n"); return ERR_PTR(-EINVAL); }
node = of_parse_phandle(np, "extcon", index); if (!node) { dev_dbg(dev, "failed to get phandle in %pOF node\n", np); return ERR_PTR(-ENODEV); }
edev = extcon_find_edev_by_node(node); of_node_put(node);
return edev;}
#else
struct extcon_dev *extcon_find_edev_by_node(struct device_node *node){ return ERR_PTR(-ENOSYS);}
struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index){ return ERR_PTR(-ENOSYS);}
#endif /* CONFIG_OF */
EXPORT_SYMBOL_GPL(extcon_find_edev_by_node);EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle);
/** * extcon_get_edev_name() - Get the name of the extcon device. * @edev: the extcon device */const char *extcon_get_edev_name(struct extcon_dev *edev){ return !edev ? NULL : edev->name;}EXPORT_SYMBOL_GPL(extcon_get_edev_name);
static int __init extcon_class_init(void){ return create_extcon_class();}module_init(extcon_class_init);
static void __exit extcon_class_exit(void){ class_destroy(extcon_class);}module_exit(extcon_class_exit);
MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");MODULE_DESCRIPTION("External Connector (extcon) framework");MODULE_LICENSE("GPL v2");