This patch renames the extcon core driver from extcon-class.c to extcon.c because '-class' postfix is not necessary.
Signed-off-by: Chanwoo Choi <cw00.c...@samsung.com> --- drivers/extcon/Makefile | 2 +- drivers/extcon/extcon-class.c | 1038 ----------------------------------------- drivers/extcon/extcon.c | 1038 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 1039 insertions(+), 1039 deletions(-) delete mode 100644 drivers/extcon/extcon-class.c create mode 100644 drivers/extcon/extcon.c diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile index e1eb2d5..9204114 100644 --- a/drivers/extcon/Makefile +++ b/drivers/extcon/Makefile @@ -2,7 +2,7 @@ # Makefile for external connector class (extcon) devices # -obj-$(CONFIG_EXTCON) += extcon-class.o +obj-$(CONFIG_EXTCON) += extcon.o obj-$(CONFIG_EXTCON_ADC_JACK) += extcon-adc-jack.o obj-$(CONFIG_EXTCON_ARIZONA) += extcon-arizona.o obj-$(CONFIG_EXTCON_GPIO) += extcon-gpio.o diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c deleted file mode 100644 index 8319f25..0000000 --- a/drivers/extcon/extcon-class.c +++ /dev/null @@ -1,1038 +0,0 @@ -/* - * drivers/extcon/extcon_class.c - * - * External connector (extcon) class driver - * - * Copyright (C) 2012 Samsung Electronics - * Author: Donggeun Kim <dg77....@samsung.com> - * Author: MyungJoo Ham <myungjoo....@samsung.com> - * - * based on android/drivers/switch/switch_class.c - * Copyright (C) 2008 Google, Inc. - * Author: Mike Lockwood <lockw...@android.com> - * - * This software is licensed under the terms of the GNU General Public - * License version 2, as published by the Free Software Foundation, and - * may be copied, distributed, and modified under those terms. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * -*/ - -#include <linux/module.h> -#include <linux/types.h> -#include <linux/init.h> -#include <linux/device.h> -#include <linux/fs.h> -#include <linux/err.h> -#include <linux/extcon.h> -#include <linux/of.h> -#include <linux/slab.h> -#include <linux/sysfs.h> - -/* - * extcon_cable_name suggests the standard cable names for commonly used - * cable types. - * - * However, please do not use extcon_cable_name directly for extcon_dev - * struct's supported_cable pointer unless your device really supports - * every single port-type of the following cable names. Please choose cable - * names that are actually used in your extcon device. - */ -const char extcon_cable_name[][CABLE_NAME_MAX + 1] = { - [EXTCON_USB] = "USB", - [EXTCON_USB_HOST] = "USB-Host", - [EXTCON_TA] = "TA", - [EXTCON_FAST_CHARGER] = "Fast-charger", - [EXTCON_SLOW_CHARGER] = "Slow-charger", - [EXTCON_CHARGE_DOWNSTREAM] = "Charge-downstream", - [EXTCON_HDMI] = "HDMI", - [EXTCON_MHL] = "MHL", - [EXTCON_DVI] = "DVI", - [EXTCON_VGA] = "VGA", - [EXTCON_DOCK] = "Dock", - [EXTCON_LINE_IN] = "Line-in", - [EXTCON_LINE_OUT] = "Line-out", - [EXTCON_MIC_IN] = "Microphone", - [EXTCON_HEADPHONE_OUT] = "Headphone", - [EXTCON_SPDIF_IN] = "SPDIF-in", - [EXTCON_SPDIF_OUT] = "SPDIF-out", - [EXTCON_VIDEO_IN] = "Video-in", - [EXTCON_VIDEO_OUT] = "Video-out", - [EXTCON_MECHANICAL] = "Mechanical", -}; - -static struct class *extcon_class; -#if defined(CONFIG_ANDROID) -static struct class_compat *switch_class; -#endif /* CONFIG_ANDROID */ - -static LIST_HEAD(extcon_dev_list); -static DEFINE_MUTEX(extcon_dev_list_lock); - -/** - * check_mutually_exclusive - Check if new_state violates mutually_exclusive - * condition. - * @edev: the extcon device - * @new_state: new cable attach status for @edev - * - * Returns 0 if nothing violates. Returns the index + 1 for the first - * violated condition. - */ -static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state) -{ - int i = 0; - - 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 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->print_state) { - int ret = edev->print_state(edev, buf); - - if (ret >= 0) - return ret; - /* Use default if failed */ - } - - if (edev->max_supported == 0) - return sprintf(buf, "%u\n", edev->state); - - for (i = 0; i < SUPPORTED_CABLE_MAX; i++) { - if (!edev->supported_cable[i]) - break; - count += sprintf(buf + count, "%s=%d\n", - edev->supported_cable[i], - !!(edev->state & (1 << i))); - } - - return count; -} - -static ssize_t state_store(struct device *dev, struct device_attribute *attr, - const char *buf, size_t count) -{ - u32 state; - ssize_t ret = 0; - struct extcon_dev *edev = dev_get_drvdata(dev); - - ret = sscanf(buf, "0x%x", &state); - if (ret == 0) - ret = -EINVAL; - else - ret = extcon_set_state(edev, state); - - if (ret < 0) - return ret; - - return count; -} -static DEVICE_ATTR_RW(state); - -static ssize_t name_show(struct device *dev, struct device_attribute *attr, - char *buf) -{ - struct extcon_dev *edev = dev_get_drvdata(dev); - - /* Optional callback given by the user */ - if (edev->print_name) { - int ret = edev->print_name(edev, buf); - if (ret >= 0) - return ret; - } - - return sprintf(buf, "%s\n", dev_name(&edev->dev)); -} -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); - - return sprintf(buf, "%s\n", - cable->edev->supported_cable[cable->cable_index]); -} - -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); - - return sprintf(buf, "%d\n", - extcon_get_cable_state_(cable->edev, - cable->cable_index)); -} - -/** - * extcon_update_state() - Update the cable attach states of the extcon device - * only for the masked bits. - * @edev: the extcon device - * @mask: the bit mask to designate updated bits. - * @state: new cable attach status for @edev - * - * Changing the state sends uevent with environment variable containing - * the name of extcon device (envp[0]) and the state output (envp[1]). - * Tizen uses this format for extcon device to get events from ports. - * Android uses this format as well. - * - * Note that the notifier provides which bits are changed in the state - * variable with the val parameter (second) to the callback. - */ -int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state) -{ - char name_buf[120]; - char state_buf[120]; - char *prop_buf; - char *envp[3]; - int env_offset = 0; - int length; - unsigned long flags; - - spin_lock_irqsave(&edev->lock, flags); - - if (edev->state != ((edev->state & ~mask) | (state & mask))) { - u32 old_state = edev->state; - - if (check_mutually_exclusive(edev, (edev->state & ~mask) | - (state & mask))) { - spin_unlock_irqrestore(&edev->lock, flags); - return -EPERM; - } - - edev->state &= ~mask; - edev->state |= state & mask; - - raw_notifier_call_chain(&edev->nh, old_state, edev); - /* This could be in interrupt handler */ - prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); - if (prop_buf) { - 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); - } else { - /* 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); - } - } else { - /* No changes */ - spin_unlock_irqrestore(&edev->lock, flags); - } - - return 0; -} -EXPORT_SYMBOL_GPL(extcon_update_state); - -/** - * extcon_set_state() - Set the cable attach states of the extcon device. - * @edev: the extcon device - * @state: new cable attach status for @edev - * - * Note that notifier provides which bits are changed in the state - * variable with the val parameter (second) to the callback. - */ -int extcon_set_state(struct extcon_dev *edev, u32 state) -{ - return extcon_update_state(edev, 0xffffffff, state); -} -EXPORT_SYMBOL_GPL(extcon_set_state); - -/** - * extcon_find_cable_index() - Get the cable index based on the cable name. - * @edev: the extcon device that has the cable. - * @cable_name: cable name to be searched. - * - * Note that accessing a cable state based on cable_index is faster than - * cable_name because using cable_name induces a loop with strncmp(). - * Thus, when get/set_cable_state is repeatedly used, using cable_index - * is recommended. - */ -int extcon_find_cable_index(struct extcon_dev *edev, const char *cable_name) -{ - int i; - - if (edev->supported_cable) { - for (i = 0; edev->supported_cable[i]; i++) { - if (!strncmp(edev->supported_cable[i], - cable_name, CABLE_NAME_MAX)) - return i; - } - } - - return -EINVAL; -} -EXPORT_SYMBOL_GPL(extcon_find_cable_index); - -/** - * extcon_get_cable_state_() - Get the status of a specific cable. - * @edev: the extcon device that has the cable. - * @index: cable index that can be retrieved by extcon_find_cable_index(). - */ -int extcon_get_cable_state_(struct extcon_dev *edev, int index) -{ - if (index < 0 || (edev->max_supported && edev->max_supported <= index)) - return -EINVAL; - - return !!(edev->state & (1 << index)); -} -EXPORT_SYMBOL_GPL(extcon_get_cable_state_); - -/** - * extcon_get_cable_state() - Get the status of a specific cable. - * @edev: the extcon device that has the cable. - * @cable_name: cable name. - * - * Note that this is slower than extcon_get_cable_state_. - */ -int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name) -{ - return extcon_get_cable_state_(edev, extcon_find_cable_index - (edev, cable_name)); -} -EXPORT_SYMBOL_GPL(extcon_get_cable_state); - -/** - * extcon_set_cable_state_() - Set the status of a specific cable. - * @edev: the extcon device that has the cable. - * @index: cable index that can be retrieved by - * extcon_find_cable_index(). - * @cable_state: the new cable status. The default semantics is - * true: attached / false: detached. - */ -int extcon_set_cable_state_(struct extcon_dev *edev, - int index, bool cable_state) -{ - u32 state; - - if (index < 0 || (edev->max_supported && edev->max_supported <= index)) - return -EINVAL; - - state = cable_state ? (1 << index) : 0; - return extcon_update_state(edev, 1 << index, state); -} -EXPORT_SYMBOL_GPL(extcon_set_cable_state_); - -/** - * extcon_set_cable_state() - Set the status of a specific cable. - * @edev: the extcon device that has the cable. - * @cable_name: cable name. - * @cable_state: the new cable status. The default semantics is - * true: attached / false: detached. - * - * Note that this is slower than extcon_set_cable_state_. - */ -int extcon_set_cable_state(struct extcon_dev *edev, - const char *cable_name, bool cable_state) -{ - return extcon_set_cable_state_(edev, extcon_find_cable_index - (edev, cable_name), cable_state); -} -EXPORT_SYMBOL_GPL(extcon_set_cable_state); - -/** - * extcon_get_extcon_dev() - Get the extcon device instance from the name - * @extcon_name: The extcon name provided with extcon_dev_register() - */ -struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) -{ - struct extcon_dev *sd; - - mutex_lock(&extcon_dev_list_lock); - list_for_each_entry(sd, &extcon_dev_list, entry) { - if (!strcmp(sd->name, extcon_name)) - goto out; - } - sd = NULL; -out: - mutex_unlock(&extcon_dev_list_lock); - return sd; -} -EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); - -static int _call_per_cable(struct notifier_block *nb, unsigned long val, - void *ptr) -{ - struct extcon_specific_cable_nb *obj = container_of(nb, - struct extcon_specific_cable_nb, internal_nb); - struct extcon_dev *edev = ptr; - - if ((val & (1 << obj->cable_index)) != - (edev->state & (1 << obj->cable_index))) { - bool cable_state = true; - - obj->previous_value = val; - - if (val & (1 << obj->cable_index)) - cable_state = false; - - return obj->user_nb->notifier_call(obj->user_nb, - cable_state, ptr); - } - - return NOTIFY_OK; -} - -/** - * extcon_register_interest() - Register a notifier for a state change of a - * specific cable, not an entier set of cables of a - * extcon device. - * @obj: an empty extcon_specific_cable_nb object to be returned. - * @extcon_name: the name of extcon device. - * if NULL, extcon_register_interest will register - * every cable with the target cable_name given. - * @cable_name: the target cable name. - * @nb: the notifier block to get notified. - * - * Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets - * the struct for you. - * - * extcon_register_interest is a helper function for those who want to get - * notification for a single specific cable's status change. If a user wants - * to get notification for any changes of all cables of a extcon device, - * he/she should use the general extcon_register_notifier(). - * - * Note that the second parameter given to the callback of nb (val) is - * "old_state", not the current state. The current state can be retrieved - * by looking at the third pameter (edev pointer)'s state value. - */ -int extcon_register_interest(struct extcon_specific_cable_nb *obj, - const char *extcon_name, const char *cable_name, - struct notifier_block *nb) -{ - if (!obj || !cable_name || !nb) - return -EINVAL; - - if (extcon_name) { - obj->edev = extcon_get_extcon_dev(extcon_name); - if (!obj->edev) - return -ENODEV; - - obj->cable_index = extcon_find_cable_index(obj->edev, - cable_name); - if (obj->cable_index < 0) - return obj->cable_index; - - obj->user_nb = nb; - - obj->internal_nb.notifier_call = _call_per_cable; - - return raw_notifier_chain_register(&obj->edev->nh, - &obj->internal_nb); - } else { - struct class_dev_iter iter; - struct extcon_dev *extd; - struct device *dev; - - if (!extcon_class) - return -ENODEV; - class_dev_iter_init(&iter, extcon_class, NULL, NULL); - while ((dev = class_dev_iter_next(&iter))) { - extd = dev_get_drvdata(dev); - - if (extcon_find_cable_index(extd, cable_name) < 0) - continue; - - class_dev_iter_exit(&iter); - return extcon_register_interest(obj, extd->name, - cable_name, nb); - } - - return -ENODEV; - } -} -EXPORT_SYMBOL_GPL(extcon_register_interest); - -/** - * extcon_unregister_interest() - Unregister the notifier registered by - * extcon_register_interest(). - * @obj: the extcon_specific_cable_nb object returned by - * extcon_register_interest(). - */ -int extcon_unregister_interest(struct extcon_specific_cable_nb *obj) -{ - if (!obj) - return -EINVAL; - - return raw_notifier_chain_unregister(&obj->edev->nh, &obj->internal_nb); -} -EXPORT_SYMBOL_GPL(extcon_unregister_interest); - -/** - * extcon_register_notifier() - Register a notifiee to get notified by - * any attach status changes from the extcon. - * @edev: the extcon device. - * @nb: a notifier block to be registered. - * - * Note that the second parameter given to the callback of nb (val) is - * "old_state", not the current state. The current state can be retrieved - * by looking at the third pameter (edev pointer)'s state value. - */ -int extcon_register_notifier(struct extcon_dev *edev, - struct notifier_block *nb) -{ - return raw_notifier_chain_register(&edev->nh, nb); -} -EXPORT_SYMBOL_GPL(extcon_register_notifier); - -/** - * extcon_unregister_notifier() - Unregister a notifiee from the extcon device. - * @edev: the extcon device. - * @nb: a registered notifier block to be unregistered. - */ -int extcon_unregister_notifier(struct extcon_dev *edev, - struct notifier_block *nb) -{ - return raw_notifier_chain_unregister(&edev->nh, nb); -} -EXPORT_SYMBOL_GPL(extcon_unregister_notifier); - -static struct attribute *extcon_attrs[] = { - &dev_attr_state.attr, - &dev_attr_name.attr, - NULL, -}; -ATTRIBUTE_GROUPS(extcon); - -static int create_extcon_class(void) -{ - if (!extcon_class) { - extcon_class = class_create(THIS_MODULE, "extcon"); - if (IS_ERR(extcon_class)) - return PTR_ERR(extcon_class); - extcon_class->dev_groups = extcon_groups; - -#if defined(CONFIG_ANDROID) - switch_class = class_compat_register("switch"); - if (WARN(!switch_class, "cannot allocate")) - return -ENOMEM; -#endif /* CONFIG_ANDROID */ - } - - return 0; -} - -static void extcon_dev_release(struct device *dev) -{ -} - -static const char *muex_name = "mutually_exclusive"; -static void dummy_sysfs_dev_release(struct device *dev) -{ -} - -/* - * extcon_dev_allocate() - Allocate the memory of extcon device. - * @supported_cable: Array of supported cable names ending with NULL. - * If supported_cable is NULL, cable name related APIs - * are disabled. - * - * This function allocates the memory for extcon device without allocating - * memory in each extcon provider driver and initialize default setting for - * extcon device. - * - * Return the pointer of extcon device if success or ERR_PTR(err) if fail - */ -struct extcon_dev *extcon_dev_allocate(const char **supported_cable) -{ - struct extcon_dev *edev; - - edev = kzalloc(sizeof(*edev), GFP_KERNEL); - if (!edev) - return ERR_PTR(-ENOMEM); - - edev->max_supported = 0; - edev->supported_cable = supported_cable; - - return edev; -} - -/* - * extcon_dev_free() - Free the memory of extcon device. - * @edev: the extcon device to free - */ -void extcon_dev_free(struct extcon_dev *edev) -{ - kfree(edev); -} -EXPORT_SYMBOL_GPL(extcon_dev_free); - -static int devm_extcon_dev_match(struct device *dev, void *res, void *data) -{ - struct extcon_dev **r = res; - - if (WARN_ON(!r || !*r)) - return 0; - - return *r == data; -} - -static void devm_extcon_dev_release(struct device *dev, void *res) -{ - extcon_dev_free(*(struct extcon_dev **)res); -} - -/** - * devm_extcon_dev_allocate - Allocate managed extcon device - * @dev: device owning the extcon device being created - * @supported_cable: Array of supported cable names ending with NULL. - * If supported_cable is NULL, cable name related APIs - * are disabled. - * - * This function manages automatically the memory of extcon device using device - * resource management and simplify the control of freeing the memory of extcon - * device. - * - * Returns the pointer memory of allocated extcon_dev if success - * or ERR_PTR(err) if fail - */ -struct extcon_dev *devm_extcon_dev_allocate(struct device *dev, - const char **supported_cable) -{ - struct extcon_dev **ptr, *edev; - - ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL); - if (!ptr) - return ERR_PTR(-ENOMEM); - - edev = extcon_dev_allocate(supported_cable); - if (IS_ERR(edev)) { - devres_free(ptr); - return edev; - } - - edev->dev.parent = dev; - - *ptr = edev; - devres_add(dev, ptr); - - return edev; -} -EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate); - -void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev) -{ - WARN_ON(devres_release(dev, devm_extcon_dev_release, - devm_extcon_dev_match, edev)); -} -EXPORT_SYMBOL_GPL(devm_extcon_dev_free); - -/** - * extcon_dev_register() - Register a new extcon device - * @edev : the new extcon device (should be allocated before calling) - * - * Among the members of edev struct, please set the "user initializing data" - * in any case and set the "optional callbacks" if required. However, please - * do not set the values of "internal data", which are initialized by - * this function. - */ -int extcon_dev_register(struct extcon_dev *edev) -{ - int ret, index = 0; - - if (!extcon_class) { - ret = create_extcon_class(); - if (ret < 0) - return ret; - } - - if (edev->supported_cable) { - /* Get size of array */ - for (index = 0; edev->supported_cable[index]; index++) - ; - edev->max_supported = index; - } else { - edev->max_supported = 0; - } - - if (index > SUPPORTED_CABLE_MAX) { - dev_err(&edev->dev, "extcon: maximum number of supported cables exceeded.\n"); - return -EINVAL; - } - - edev->dev.class = extcon_class; - edev->dev.release = extcon_dev_release; - - edev->name = edev->name ? edev->name : dev_name(edev->dev.parent); - if (IS_ERR_OR_NULL(edev->name)) { - dev_err(&edev->dev, - "extcon device name is null\n"); - return -EINVAL; - } - dev_set_name(&edev->dev, "%s", edev->name); - - if (edev->max_supported) { - char buf[10]; - char *str; - struct extcon_cable *cable; - - edev->cables = kzalloc(sizeof(struct extcon_cable) * - edev->max_supported, GFP_KERNEL); - if (!edev->cables) { - ret = -ENOMEM; - goto err_sysfs_alloc; - } - for (index = 0; index < edev->max_supported; index++) { - cable = &edev->cables[index]; - - snprintf(buf, 10, "cable.%d", index); - str = kzalloc(sizeof(char) * (strlen(buf) + 1), - GFP_KERNEL); - if (!str) { - for (index--; index >= 0; index--) { - cable = &edev->cables[index]; - kfree(cable->attr_g.name); - } - ret = -ENOMEM; - - goto err_alloc_cables; - } - strcpy(str, buf); - - cable->edev = edev; - cable->cable_index = index; - cable->attrs[0] = &cable->attr_name.attr; - cable->attrs[1] = &cable->attr_state.attr; - cable->attrs[2] = NULL; - cable->attr_g.name = str; - cable->attr_g.attrs = cable->attrs; - - sysfs_attr_init(&cable->attr_name.attr); - cable->attr_name.attr.name = "name"; - cable->attr_name.attr.mode = 0444; - cable->attr_name.show = cable_name_show; - - sysfs_attr_init(&cable->attr_state.attr); - cable->attr_state.attr.name = "state"; - cable->attr_state.attr.mode = 0444; - cable->attr_state.show = cable_state_show; - } - } - - if (edev->max_supported && edev->mutually_exclusive) { - char buf[80]; - char *name; - - /* Count the size of mutually_exclusive array */ - for (index = 0; edev->mutually_exclusive[index]; index++) - ; - - edev->attrs_muex = kzalloc(sizeof(struct attribute *) * - (index + 1), GFP_KERNEL); - if (!edev->attrs_muex) { - ret = -ENOMEM; - goto err_muex; - } - - edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) * - index, GFP_KERNEL); - if (!edev->d_attrs_muex) { - ret = -ENOMEM; - kfree(edev->attrs_muex); - goto err_muex; - } - - for (index = 0; edev->mutually_exclusive[index]; index++) { - sprintf(buf, "0x%x", edev->mutually_exclusive[index]); - name = kzalloc(sizeof(char) * (strlen(buf) + 1), - GFP_KERNEL); - if (!name) { - for (index--; index >= 0; index--) { - kfree(edev->d_attrs_muex[index].attr. - name); - } - kfree(edev->d_attrs_muex); - kfree(edev->attrs_muex); - ret = -ENOMEM; - goto err_muex; - } - strcpy(name, buf); - sysfs_attr_init(&edev->d_attrs_muex[index].attr); - edev->d_attrs_muex[index].attr.name = name; - edev->d_attrs_muex[index].attr.mode = 0000; - edev->attrs_muex[index] = &edev->d_attrs_muex[index] - .attr; - } - edev->attr_g_muex.name = muex_name; - edev->attr_g_muex.attrs = edev->attrs_muex; - - } - - if (edev->max_supported) { - edev->extcon_dev_type.groups = - kzalloc(sizeof(struct attribute_group *) * - (edev->max_supported + 2), GFP_KERNEL); - if (!edev->extcon_dev_type.groups) { - ret = -ENOMEM; - goto err_alloc_groups; - } - - edev->extcon_dev_type.name = dev_name(&edev->dev); - edev->extcon_dev_type.release = dummy_sysfs_dev_release; - - for (index = 0; index < edev->max_supported; index++) - edev->extcon_dev_type.groups[index] = - &edev->cables[index].attr_g; - if (edev->mutually_exclusive) - edev->extcon_dev_type.groups[index] = - &edev->attr_g_muex; - - edev->dev.type = &edev->extcon_dev_type; - } - - ret = device_register(&edev->dev); - if (ret) { - put_device(&edev->dev); - goto err_dev; - } -#if defined(CONFIG_ANDROID) - if (switch_class) - ret = class_compat_create_link(switch_class, &edev->dev, NULL); -#endif /* CONFIG_ANDROID */ - - spin_lock_init(&edev->lock); - - RAW_INIT_NOTIFIER_HEAD(&edev->nh); - - dev_set_drvdata(&edev->dev, edev); - edev->state = 0; - - mutex_lock(&extcon_dev_list_lock); - list_add(&edev->entry, &extcon_dev_list); - mutex_unlock(&extcon_dev_list_lock); - - return 0; - -err_dev: - if (edev->max_supported) - kfree(edev->extcon_dev_type.groups); -err_alloc_groups: - if (edev->max_supported && edev->mutually_exclusive) { - for (index = 0; edev->mutually_exclusive[index]; index++) - kfree(edev->d_attrs_muex[index].attr.name); - kfree(edev->d_attrs_muex); - kfree(edev->attrs_muex); - } -err_muex: - for (index = 0; index < edev->max_supported; index++) - kfree(edev->cables[index].attr_g.name); -err_alloc_cables: - if (edev->max_supported) - kfree(edev->cables); -err_sysfs_alloc: - return ret; -} -EXPORT_SYMBOL_GPL(extcon_dev_register); - -/** - * extcon_dev_unregister() - Unregister the extcon device. - * @edev: the extcon device instance to be unregistered. - * - * Note that this does not call kfree(edev) because edev was not allocated - * by this class. - */ -void extcon_dev_unregister(struct extcon_dev *edev) -{ - int index; - - mutex_lock(&extcon_dev_list_lock); - list_del(&edev->entry); - mutex_unlock(&extcon_dev_list_lock); - - if (IS_ERR_OR_NULL(get_device(&edev->dev))) { - dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n", - dev_name(&edev->dev)); - return; - } - - device_unregister(&edev->dev); - - if (edev->mutually_exclusive && edev->max_supported) { - for (index = 0; edev->mutually_exclusive[index]; - index++) - kfree(edev->d_attrs_muex[index].attr.name); - kfree(edev->d_attrs_muex); - kfree(edev->attrs_muex); - } - - for (index = 0; index < edev->max_supported; index++) - kfree(edev->cables[index].attr_g.name); - - if (edev->max_supported) { - kfree(edev->extcon_dev_type.groups); - kfree(edev->cables); - } - -#if defined(CONFIG_ANDROID) - if (switch_class) - class_compat_remove_link(switch_class, &edev->dev, NULL); -#endif - put_device(&edev->dev); -} -EXPORT_SYMBOL_GPL(extcon_dev_unregister); - -static void devm_extcon_dev_unreg(struct device *dev, void *res) -{ - extcon_dev_unregister(*(struct extcon_dev **)res); -} - -/** - * devm_extcon_dev_register() - Resource-managed extcon_dev_register() - * @dev: device to allocate extcon device - * @edev: the new extcon device to register - * - * Managed extcon_dev_register() function. If extcon device is attached with - * this function, that extcon device is automatically unregistered on driver - * detach. Internally this function calls extcon_dev_register() function. - * To get more information, refer that function. - * - * If extcon device is registered with this function and the device needs to be - * unregistered separately, devm_extcon_dev_unregister() should be used. - * - * Returns 0 if success or negaive error number if failure. - */ -int devm_extcon_dev_register(struct device *dev, struct extcon_dev *edev) -{ - struct extcon_dev **ptr; - int ret; - - ptr = devres_alloc(devm_extcon_dev_unreg, sizeof(*ptr), GFP_KERNEL); - if (!ptr) - return -ENOMEM; - - ret = extcon_dev_register(edev); - if (ret) { - devres_free(ptr); - return ret; - } - - *ptr = edev; - devres_add(dev, ptr); - - return 0; -} -EXPORT_SYMBOL_GPL(devm_extcon_dev_register); - -/** - * devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister() - * @dev: device the extcon belongs to - * @edev: the extcon device to unregister - * - * Unregister extcon device that is registered with devm_extcon_dev_register() - * function. - */ -void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev) -{ - WARN_ON(devres_release(dev, devm_extcon_dev_unreg, - devm_extcon_dev_match, edev)); -} -EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister); - -#ifdef CONFIG_OF -/* - * extcon_get_edev_by_phandle - Get the extcon device from devicetree - * @dev - instance to the given device - * @index - index into list of extcon_dev - * - * return the instance of extcon device - */ -struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) -{ - struct device_node *node; - struct extcon_dev *edev; - - if (!dev->of_node) { - dev_err(dev, "device does not have a device node entry\n"); - return ERR_PTR(-EINVAL); - } - - node = of_parse_phandle(dev->of_node, "extcon", index); - if (!node) { - dev_err(dev, "failed to get phandle in %s node\n", - dev->of_node->full_name); - return ERR_PTR(-ENODEV); - } - - mutex_lock(&extcon_dev_list_lock); - list_for_each_entry(edev, &extcon_dev_list, entry) { - if (edev->dev.parent && edev->dev.parent->of_node == node) { - mutex_unlock(&extcon_dev_list_lock); - return edev; - } - } - mutex_unlock(&extcon_dev_list_lock); - - return ERR_PTR(-EPROBE_DEFER); -} -#else -struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) -{ - return ERR_PTR(-ENOSYS); -} -#endif /* CONFIG_OF */ -EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle); - -static int __init extcon_class_init(void) -{ - return create_extcon_class(); -} -module_init(extcon_class_init); - -static void __exit extcon_class_exit(void) -{ -#if defined(CONFIG_ANDROID) - class_compat_unregister(switch_class); -#endif - class_destroy(extcon_class); -} -module_exit(extcon_class_exit); - -MODULE_AUTHOR("Mike Lockwood <lockw...@android.com>"); -MODULE_AUTHOR("Donggeun Kim <dg77....@samsung.com>"); -MODULE_AUTHOR("MyungJoo Ham <myungjoo....@samsung.com>"); -MODULE_DESCRIPTION("External connector (extcon) class driver"); -MODULE_LICENSE("GPL"); diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c new file mode 100644 index 0000000..8319f25 --- /dev/null +++ b/drivers/extcon/extcon.c @@ -0,0 +1,1038 @@ +/* + * drivers/extcon/extcon_class.c + * + * External connector (extcon) class driver + * + * Copyright (C) 2012 Samsung Electronics + * Author: Donggeun Kim <dg77....@samsung.com> + * Author: MyungJoo Ham <myungjoo....@samsung.com> + * + * based on android/drivers/switch/switch_class.c + * Copyright (C) 2008 Google, Inc. + * Author: Mike Lockwood <lockw...@android.com> + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * +*/ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/init.h> +#include <linux/device.h> +#include <linux/fs.h> +#include <linux/err.h> +#include <linux/extcon.h> +#include <linux/of.h> +#include <linux/slab.h> +#include <linux/sysfs.h> + +/* + * extcon_cable_name suggests the standard cable names for commonly used + * cable types. + * + * However, please do not use extcon_cable_name directly for extcon_dev + * struct's supported_cable pointer unless your device really supports + * every single port-type of the following cable names. Please choose cable + * names that are actually used in your extcon device. + */ +const char extcon_cable_name[][CABLE_NAME_MAX + 1] = { + [EXTCON_USB] = "USB", + [EXTCON_USB_HOST] = "USB-Host", + [EXTCON_TA] = "TA", + [EXTCON_FAST_CHARGER] = "Fast-charger", + [EXTCON_SLOW_CHARGER] = "Slow-charger", + [EXTCON_CHARGE_DOWNSTREAM] = "Charge-downstream", + [EXTCON_HDMI] = "HDMI", + [EXTCON_MHL] = "MHL", + [EXTCON_DVI] = "DVI", + [EXTCON_VGA] = "VGA", + [EXTCON_DOCK] = "Dock", + [EXTCON_LINE_IN] = "Line-in", + [EXTCON_LINE_OUT] = "Line-out", + [EXTCON_MIC_IN] = "Microphone", + [EXTCON_HEADPHONE_OUT] = "Headphone", + [EXTCON_SPDIF_IN] = "SPDIF-in", + [EXTCON_SPDIF_OUT] = "SPDIF-out", + [EXTCON_VIDEO_IN] = "Video-in", + [EXTCON_VIDEO_OUT] = "Video-out", + [EXTCON_MECHANICAL] = "Mechanical", +}; + +static struct class *extcon_class; +#if defined(CONFIG_ANDROID) +static struct class_compat *switch_class; +#endif /* CONFIG_ANDROID */ + +static LIST_HEAD(extcon_dev_list); +static DEFINE_MUTEX(extcon_dev_list_lock); + +/** + * check_mutually_exclusive - Check if new_state violates mutually_exclusive + * condition. + * @edev: the extcon device + * @new_state: new cable attach status for @edev + * + * Returns 0 if nothing violates. Returns the index + 1 for the first + * violated condition. + */ +static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state) +{ + int i = 0; + + 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 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->print_state) { + int ret = edev->print_state(edev, buf); + + if (ret >= 0) + return ret; + /* Use default if failed */ + } + + if (edev->max_supported == 0) + return sprintf(buf, "%u\n", edev->state); + + for (i = 0; i < SUPPORTED_CABLE_MAX; i++) { + if (!edev->supported_cable[i]) + break; + count += sprintf(buf + count, "%s=%d\n", + edev->supported_cable[i], + !!(edev->state & (1 << i))); + } + + return count; +} + +static ssize_t state_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + u32 state; + ssize_t ret = 0; + struct extcon_dev *edev = dev_get_drvdata(dev); + + ret = sscanf(buf, "0x%x", &state); + if (ret == 0) + ret = -EINVAL; + else + ret = extcon_set_state(edev, state); + + if (ret < 0) + return ret; + + return count; +} +static DEVICE_ATTR_RW(state); + +static ssize_t name_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct extcon_dev *edev = dev_get_drvdata(dev); + + /* Optional callback given by the user */ + if (edev->print_name) { + int ret = edev->print_name(edev, buf); + if (ret >= 0) + return ret; + } + + return sprintf(buf, "%s\n", dev_name(&edev->dev)); +} +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); + + return sprintf(buf, "%s\n", + cable->edev->supported_cable[cable->cable_index]); +} + +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); + + return sprintf(buf, "%d\n", + extcon_get_cable_state_(cable->edev, + cable->cable_index)); +} + +/** + * extcon_update_state() - Update the cable attach states of the extcon device + * only for the masked bits. + * @edev: the extcon device + * @mask: the bit mask to designate updated bits. + * @state: new cable attach status for @edev + * + * Changing the state sends uevent with environment variable containing + * the name of extcon device (envp[0]) and the state output (envp[1]). + * Tizen uses this format for extcon device to get events from ports. + * Android uses this format as well. + * + * Note that the notifier provides which bits are changed in the state + * variable with the val parameter (second) to the callback. + */ +int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state) +{ + char name_buf[120]; + char state_buf[120]; + char *prop_buf; + char *envp[3]; + int env_offset = 0; + int length; + unsigned long flags; + + spin_lock_irqsave(&edev->lock, flags); + + if (edev->state != ((edev->state & ~mask) | (state & mask))) { + u32 old_state = edev->state; + + if (check_mutually_exclusive(edev, (edev->state & ~mask) | + (state & mask))) { + spin_unlock_irqrestore(&edev->lock, flags); + return -EPERM; + } + + edev->state &= ~mask; + edev->state |= state & mask; + + raw_notifier_call_chain(&edev->nh, old_state, edev); + /* This could be in interrupt handler */ + prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); + if (prop_buf) { + 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); + } else { + /* 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); + } + } else { + /* No changes */ + spin_unlock_irqrestore(&edev->lock, flags); + } + + return 0; +} +EXPORT_SYMBOL_GPL(extcon_update_state); + +/** + * extcon_set_state() - Set the cable attach states of the extcon device. + * @edev: the extcon device + * @state: new cable attach status for @edev + * + * Note that notifier provides which bits are changed in the state + * variable with the val parameter (second) to the callback. + */ +int extcon_set_state(struct extcon_dev *edev, u32 state) +{ + return extcon_update_state(edev, 0xffffffff, state); +} +EXPORT_SYMBOL_GPL(extcon_set_state); + +/** + * extcon_find_cable_index() - Get the cable index based on the cable name. + * @edev: the extcon device that has the cable. + * @cable_name: cable name to be searched. + * + * Note that accessing a cable state based on cable_index is faster than + * cable_name because using cable_name induces a loop with strncmp(). + * Thus, when get/set_cable_state is repeatedly used, using cable_index + * is recommended. + */ +int extcon_find_cable_index(struct extcon_dev *edev, const char *cable_name) +{ + int i; + + if (edev->supported_cable) { + for (i = 0; edev->supported_cable[i]; i++) { + if (!strncmp(edev->supported_cable[i], + cable_name, CABLE_NAME_MAX)) + return i; + } + } + + return -EINVAL; +} +EXPORT_SYMBOL_GPL(extcon_find_cable_index); + +/** + * extcon_get_cable_state_() - Get the status of a specific cable. + * @edev: the extcon device that has the cable. + * @index: cable index that can be retrieved by extcon_find_cable_index(). + */ +int extcon_get_cable_state_(struct extcon_dev *edev, int index) +{ + if (index < 0 || (edev->max_supported && edev->max_supported <= index)) + return -EINVAL; + + return !!(edev->state & (1 << index)); +} +EXPORT_SYMBOL_GPL(extcon_get_cable_state_); + +/** + * extcon_get_cable_state() - Get the status of a specific cable. + * @edev: the extcon device that has the cable. + * @cable_name: cable name. + * + * Note that this is slower than extcon_get_cable_state_. + */ +int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name) +{ + return extcon_get_cable_state_(edev, extcon_find_cable_index + (edev, cable_name)); +} +EXPORT_SYMBOL_GPL(extcon_get_cable_state); + +/** + * extcon_set_cable_state_() - Set the status of a specific cable. + * @edev: the extcon device that has the cable. + * @index: cable index that can be retrieved by + * extcon_find_cable_index(). + * @cable_state: the new cable status. The default semantics is + * true: attached / false: detached. + */ +int extcon_set_cable_state_(struct extcon_dev *edev, + int index, bool cable_state) +{ + u32 state; + + if (index < 0 || (edev->max_supported && edev->max_supported <= index)) + return -EINVAL; + + state = cable_state ? (1 << index) : 0; + return extcon_update_state(edev, 1 << index, state); +} +EXPORT_SYMBOL_GPL(extcon_set_cable_state_); + +/** + * extcon_set_cable_state() - Set the status of a specific cable. + * @edev: the extcon device that has the cable. + * @cable_name: cable name. + * @cable_state: the new cable status. The default semantics is + * true: attached / false: detached. + * + * Note that this is slower than extcon_set_cable_state_. + */ +int extcon_set_cable_state(struct extcon_dev *edev, + const char *cable_name, bool cable_state) +{ + return extcon_set_cable_state_(edev, extcon_find_cable_index + (edev, cable_name), cable_state); +} +EXPORT_SYMBOL_GPL(extcon_set_cable_state); + +/** + * extcon_get_extcon_dev() - Get the extcon device instance from the name + * @extcon_name: The extcon name provided with extcon_dev_register() + */ +struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) +{ + struct extcon_dev *sd; + + mutex_lock(&extcon_dev_list_lock); + list_for_each_entry(sd, &extcon_dev_list, entry) { + if (!strcmp(sd->name, extcon_name)) + goto out; + } + sd = NULL; +out: + mutex_unlock(&extcon_dev_list_lock); + return sd; +} +EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); + +static int _call_per_cable(struct notifier_block *nb, unsigned long val, + void *ptr) +{ + struct extcon_specific_cable_nb *obj = container_of(nb, + struct extcon_specific_cable_nb, internal_nb); + struct extcon_dev *edev = ptr; + + if ((val & (1 << obj->cable_index)) != + (edev->state & (1 << obj->cable_index))) { + bool cable_state = true; + + obj->previous_value = val; + + if (val & (1 << obj->cable_index)) + cable_state = false; + + return obj->user_nb->notifier_call(obj->user_nb, + cable_state, ptr); + } + + return NOTIFY_OK; +} + +/** + * extcon_register_interest() - Register a notifier for a state change of a + * specific cable, not an entier set of cables of a + * extcon device. + * @obj: an empty extcon_specific_cable_nb object to be returned. + * @extcon_name: the name of extcon device. + * if NULL, extcon_register_interest will register + * every cable with the target cable_name given. + * @cable_name: the target cable name. + * @nb: the notifier block to get notified. + * + * Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets + * the struct for you. + * + * extcon_register_interest is a helper function for those who want to get + * notification for a single specific cable's status change. If a user wants + * to get notification for any changes of all cables of a extcon device, + * he/she should use the general extcon_register_notifier(). + * + * Note that the second parameter given to the callback of nb (val) is + * "old_state", not the current state. The current state can be retrieved + * by looking at the third pameter (edev pointer)'s state value. + */ +int extcon_register_interest(struct extcon_specific_cable_nb *obj, + const char *extcon_name, const char *cable_name, + struct notifier_block *nb) +{ + if (!obj || !cable_name || !nb) + return -EINVAL; + + if (extcon_name) { + obj->edev = extcon_get_extcon_dev(extcon_name); + if (!obj->edev) + return -ENODEV; + + obj->cable_index = extcon_find_cable_index(obj->edev, + cable_name); + if (obj->cable_index < 0) + return obj->cable_index; + + obj->user_nb = nb; + + obj->internal_nb.notifier_call = _call_per_cable; + + return raw_notifier_chain_register(&obj->edev->nh, + &obj->internal_nb); + } else { + struct class_dev_iter iter; + struct extcon_dev *extd; + struct device *dev; + + if (!extcon_class) + return -ENODEV; + class_dev_iter_init(&iter, extcon_class, NULL, NULL); + while ((dev = class_dev_iter_next(&iter))) { + extd = dev_get_drvdata(dev); + + if (extcon_find_cable_index(extd, cable_name) < 0) + continue; + + class_dev_iter_exit(&iter); + return extcon_register_interest(obj, extd->name, + cable_name, nb); + } + + return -ENODEV; + } +} +EXPORT_SYMBOL_GPL(extcon_register_interest); + +/** + * extcon_unregister_interest() - Unregister the notifier registered by + * extcon_register_interest(). + * @obj: the extcon_specific_cable_nb object returned by + * extcon_register_interest(). + */ +int extcon_unregister_interest(struct extcon_specific_cable_nb *obj) +{ + if (!obj) + return -EINVAL; + + return raw_notifier_chain_unregister(&obj->edev->nh, &obj->internal_nb); +} +EXPORT_SYMBOL_GPL(extcon_unregister_interest); + +/** + * extcon_register_notifier() - Register a notifiee to get notified by + * any attach status changes from the extcon. + * @edev: the extcon device. + * @nb: a notifier block to be registered. + * + * Note that the second parameter given to the callback of nb (val) is + * "old_state", not the current state. The current state can be retrieved + * by looking at the third pameter (edev pointer)'s state value. + */ +int extcon_register_notifier(struct extcon_dev *edev, + struct notifier_block *nb) +{ + return raw_notifier_chain_register(&edev->nh, nb); +} +EXPORT_SYMBOL_GPL(extcon_register_notifier); + +/** + * extcon_unregister_notifier() - Unregister a notifiee from the extcon device. + * @edev: the extcon device. + * @nb: a registered notifier block to be unregistered. + */ +int extcon_unregister_notifier(struct extcon_dev *edev, + struct notifier_block *nb) +{ + return raw_notifier_chain_unregister(&edev->nh, nb); +} +EXPORT_SYMBOL_GPL(extcon_unregister_notifier); + +static struct attribute *extcon_attrs[] = { + &dev_attr_state.attr, + &dev_attr_name.attr, + NULL, +}; +ATTRIBUTE_GROUPS(extcon); + +static int create_extcon_class(void) +{ + if (!extcon_class) { + extcon_class = class_create(THIS_MODULE, "extcon"); + if (IS_ERR(extcon_class)) + return PTR_ERR(extcon_class); + extcon_class->dev_groups = extcon_groups; + +#if defined(CONFIG_ANDROID) + switch_class = class_compat_register("switch"); + if (WARN(!switch_class, "cannot allocate")) + return -ENOMEM; +#endif /* CONFIG_ANDROID */ + } + + return 0; +} + +static void extcon_dev_release(struct device *dev) +{ +} + +static const char *muex_name = "mutually_exclusive"; +static void dummy_sysfs_dev_release(struct device *dev) +{ +} + +/* + * extcon_dev_allocate() - Allocate the memory of extcon device. + * @supported_cable: Array of supported cable names ending with NULL. + * If supported_cable is NULL, cable name related APIs + * are disabled. + * + * This function allocates the memory for extcon device without allocating + * memory in each extcon provider driver and initialize default setting for + * extcon device. + * + * Return the pointer of extcon device if success or ERR_PTR(err) if fail + */ +struct extcon_dev *extcon_dev_allocate(const char **supported_cable) +{ + struct extcon_dev *edev; + + edev = kzalloc(sizeof(*edev), GFP_KERNEL); + if (!edev) + return ERR_PTR(-ENOMEM); + + edev->max_supported = 0; + edev->supported_cable = supported_cable; + + return edev; +} + +/* + * extcon_dev_free() - Free the memory of extcon device. + * @edev: the extcon device to free + */ +void extcon_dev_free(struct extcon_dev *edev) +{ + kfree(edev); +} +EXPORT_SYMBOL_GPL(extcon_dev_free); + +static int devm_extcon_dev_match(struct device *dev, void *res, void *data) +{ + struct extcon_dev **r = res; + + if (WARN_ON(!r || !*r)) + return 0; + + return *r == data; +} + +static void devm_extcon_dev_release(struct device *dev, void *res) +{ + extcon_dev_free(*(struct extcon_dev **)res); +} + +/** + * devm_extcon_dev_allocate - Allocate managed extcon device + * @dev: device owning the extcon device being created + * @supported_cable: Array of supported cable names ending with NULL. + * If supported_cable is NULL, cable name related APIs + * are disabled. + * + * This function manages automatically the memory of extcon device using device + * resource management and simplify the control of freeing the memory of extcon + * device. + * + * Returns the pointer memory of allocated extcon_dev if success + * or ERR_PTR(err) if fail + */ +struct extcon_dev *devm_extcon_dev_allocate(struct device *dev, + const char **supported_cable) +{ + struct extcon_dev **ptr, *edev; + + ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return ERR_PTR(-ENOMEM); + + edev = extcon_dev_allocate(supported_cable); + if (IS_ERR(edev)) { + devres_free(ptr); + return edev; + } + + edev->dev.parent = dev; + + *ptr = edev; + devres_add(dev, ptr); + + return edev; +} +EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate); + +void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev) +{ + WARN_ON(devres_release(dev, devm_extcon_dev_release, + devm_extcon_dev_match, edev)); +} +EXPORT_SYMBOL_GPL(devm_extcon_dev_free); + +/** + * extcon_dev_register() - Register a new extcon device + * @edev : the new extcon device (should be allocated before calling) + * + * Among the members of edev struct, please set the "user initializing data" + * in any case and set the "optional callbacks" if required. However, please + * do not set the values of "internal data", which are initialized by + * this function. + */ +int extcon_dev_register(struct extcon_dev *edev) +{ + int ret, index = 0; + + if (!extcon_class) { + ret = create_extcon_class(); + if (ret < 0) + return ret; + } + + if (edev->supported_cable) { + /* Get size of array */ + for (index = 0; edev->supported_cable[index]; index++) + ; + edev->max_supported = index; + } else { + edev->max_supported = 0; + } + + if (index > SUPPORTED_CABLE_MAX) { + dev_err(&edev->dev, "extcon: maximum number of supported cables exceeded.\n"); + return -EINVAL; + } + + edev->dev.class = extcon_class; + edev->dev.release = extcon_dev_release; + + edev->name = edev->name ? edev->name : dev_name(edev->dev.parent); + if (IS_ERR_OR_NULL(edev->name)) { + dev_err(&edev->dev, + "extcon device name is null\n"); + return -EINVAL; + } + dev_set_name(&edev->dev, "%s", edev->name); + + if (edev->max_supported) { + char buf[10]; + char *str; + struct extcon_cable *cable; + + edev->cables = kzalloc(sizeof(struct extcon_cable) * + edev->max_supported, GFP_KERNEL); + if (!edev->cables) { + ret = -ENOMEM; + goto err_sysfs_alloc; + } + for (index = 0; index < edev->max_supported; index++) { + cable = &edev->cables[index]; + + snprintf(buf, 10, "cable.%d", index); + str = kzalloc(sizeof(char) * (strlen(buf) + 1), + GFP_KERNEL); + if (!str) { + for (index--; index >= 0; index--) { + cable = &edev->cables[index]; + kfree(cable->attr_g.name); + } + ret = -ENOMEM; + + goto err_alloc_cables; + } + strcpy(str, buf); + + cable->edev = edev; + cable->cable_index = index; + cable->attrs[0] = &cable->attr_name.attr; + cable->attrs[1] = &cable->attr_state.attr; + cable->attrs[2] = NULL; + cable->attr_g.name = str; + cable->attr_g.attrs = cable->attrs; + + sysfs_attr_init(&cable->attr_name.attr); + cable->attr_name.attr.name = "name"; + cable->attr_name.attr.mode = 0444; + cable->attr_name.show = cable_name_show; + + sysfs_attr_init(&cable->attr_state.attr); + cable->attr_state.attr.name = "state"; + cable->attr_state.attr.mode = 0444; + cable->attr_state.show = cable_state_show; + } + } + + if (edev->max_supported && edev->mutually_exclusive) { + char buf[80]; + char *name; + + /* Count the size of mutually_exclusive array */ + for (index = 0; edev->mutually_exclusive[index]; index++) + ; + + edev->attrs_muex = kzalloc(sizeof(struct attribute *) * + (index + 1), GFP_KERNEL); + if (!edev->attrs_muex) { + ret = -ENOMEM; + goto err_muex; + } + + edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) * + index, GFP_KERNEL); + if (!edev->d_attrs_muex) { + ret = -ENOMEM; + kfree(edev->attrs_muex); + goto err_muex; + } + + for (index = 0; edev->mutually_exclusive[index]; index++) { + sprintf(buf, "0x%x", edev->mutually_exclusive[index]); + name = kzalloc(sizeof(char) * (strlen(buf) + 1), + GFP_KERNEL); + if (!name) { + for (index--; index >= 0; index--) { + kfree(edev->d_attrs_muex[index].attr. + name); + } + kfree(edev->d_attrs_muex); + kfree(edev->attrs_muex); + ret = -ENOMEM; + goto err_muex; + } + strcpy(name, buf); + sysfs_attr_init(&edev->d_attrs_muex[index].attr); + edev->d_attrs_muex[index].attr.name = name; + edev->d_attrs_muex[index].attr.mode = 0000; + edev->attrs_muex[index] = &edev->d_attrs_muex[index] + .attr; + } + edev->attr_g_muex.name = muex_name; + edev->attr_g_muex.attrs = edev->attrs_muex; + + } + + if (edev->max_supported) { + edev->extcon_dev_type.groups = + kzalloc(sizeof(struct attribute_group *) * + (edev->max_supported + 2), GFP_KERNEL); + if (!edev->extcon_dev_type.groups) { + ret = -ENOMEM; + goto err_alloc_groups; + } + + edev->extcon_dev_type.name = dev_name(&edev->dev); + edev->extcon_dev_type.release = dummy_sysfs_dev_release; + + for (index = 0; index < edev->max_supported; index++) + edev->extcon_dev_type.groups[index] = + &edev->cables[index].attr_g; + if (edev->mutually_exclusive) + edev->extcon_dev_type.groups[index] = + &edev->attr_g_muex; + + edev->dev.type = &edev->extcon_dev_type; + } + + ret = device_register(&edev->dev); + if (ret) { + put_device(&edev->dev); + goto err_dev; + } +#if defined(CONFIG_ANDROID) + if (switch_class) + ret = class_compat_create_link(switch_class, &edev->dev, NULL); +#endif /* CONFIG_ANDROID */ + + spin_lock_init(&edev->lock); + + RAW_INIT_NOTIFIER_HEAD(&edev->nh); + + dev_set_drvdata(&edev->dev, edev); + edev->state = 0; + + mutex_lock(&extcon_dev_list_lock); + list_add(&edev->entry, &extcon_dev_list); + mutex_unlock(&extcon_dev_list_lock); + + return 0; + +err_dev: + if (edev->max_supported) + kfree(edev->extcon_dev_type.groups); +err_alloc_groups: + if (edev->max_supported && edev->mutually_exclusive) { + for (index = 0; edev->mutually_exclusive[index]; index++) + kfree(edev->d_attrs_muex[index].attr.name); + kfree(edev->d_attrs_muex); + kfree(edev->attrs_muex); + } +err_muex: + for (index = 0; index < edev->max_supported; index++) + kfree(edev->cables[index].attr_g.name); +err_alloc_cables: + if (edev->max_supported) + kfree(edev->cables); +err_sysfs_alloc: + return ret; +} +EXPORT_SYMBOL_GPL(extcon_dev_register); + +/** + * extcon_dev_unregister() - Unregister the extcon device. + * @edev: the extcon device instance to be unregistered. + * + * Note that this does not call kfree(edev) because edev was not allocated + * by this class. + */ +void extcon_dev_unregister(struct extcon_dev *edev) +{ + int index; + + mutex_lock(&extcon_dev_list_lock); + list_del(&edev->entry); + mutex_unlock(&extcon_dev_list_lock); + + if (IS_ERR_OR_NULL(get_device(&edev->dev))) { + dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n", + dev_name(&edev->dev)); + return; + } + + device_unregister(&edev->dev); + + if (edev->mutually_exclusive && edev->max_supported) { + for (index = 0; edev->mutually_exclusive[index]; + index++) + kfree(edev->d_attrs_muex[index].attr.name); + kfree(edev->d_attrs_muex); + kfree(edev->attrs_muex); + } + + for (index = 0; index < edev->max_supported; index++) + kfree(edev->cables[index].attr_g.name); + + if (edev->max_supported) { + kfree(edev->extcon_dev_type.groups); + kfree(edev->cables); + } + +#if defined(CONFIG_ANDROID) + if (switch_class) + class_compat_remove_link(switch_class, &edev->dev, NULL); +#endif + put_device(&edev->dev); +} +EXPORT_SYMBOL_GPL(extcon_dev_unregister); + +static void devm_extcon_dev_unreg(struct device *dev, void *res) +{ + extcon_dev_unregister(*(struct extcon_dev **)res); +} + +/** + * devm_extcon_dev_register() - Resource-managed extcon_dev_register() + * @dev: device to allocate extcon device + * @edev: the new extcon device to register + * + * Managed extcon_dev_register() function. If extcon device is attached with + * this function, that extcon device is automatically unregistered on driver + * detach. Internally this function calls extcon_dev_register() function. + * To get more information, refer that function. + * + * If extcon device is registered with this function and the device needs to be + * unregistered separately, devm_extcon_dev_unregister() should be used. + * + * Returns 0 if success or negaive error number if failure. + */ +int devm_extcon_dev_register(struct device *dev, struct extcon_dev *edev) +{ + struct extcon_dev **ptr; + int ret; + + ptr = devres_alloc(devm_extcon_dev_unreg, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return -ENOMEM; + + ret = extcon_dev_register(edev); + if (ret) { + devres_free(ptr); + return ret; + } + + *ptr = edev; + devres_add(dev, ptr); + + return 0; +} +EXPORT_SYMBOL_GPL(devm_extcon_dev_register); + +/** + * devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister() + * @dev: device the extcon belongs to + * @edev: the extcon device to unregister + * + * Unregister extcon device that is registered with devm_extcon_dev_register() + * function. + */ +void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev) +{ + WARN_ON(devres_release(dev, devm_extcon_dev_unreg, + devm_extcon_dev_match, edev)); +} +EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister); + +#ifdef CONFIG_OF +/* + * extcon_get_edev_by_phandle - Get the extcon device from devicetree + * @dev - instance to the given device + * @index - index into list of extcon_dev + * + * return the instance of extcon device + */ +struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) +{ + struct device_node *node; + struct extcon_dev *edev; + + if (!dev->of_node) { + dev_err(dev, "device does not have a device node entry\n"); + return ERR_PTR(-EINVAL); + } + + node = of_parse_phandle(dev->of_node, "extcon", index); + if (!node) { + dev_err(dev, "failed to get phandle in %s node\n", + dev->of_node->full_name); + return ERR_PTR(-ENODEV); + } + + mutex_lock(&extcon_dev_list_lock); + list_for_each_entry(edev, &extcon_dev_list, entry) { + if (edev->dev.parent && edev->dev.parent->of_node == node) { + mutex_unlock(&extcon_dev_list_lock); + return edev; + } + } + mutex_unlock(&extcon_dev_list_lock); + + return ERR_PTR(-EPROBE_DEFER); +} +#else +struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index) +{ + return ERR_PTR(-ENOSYS); +} +#endif /* CONFIG_OF */ +EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle); + +static int __init extcon_class_init(void) +{ + return create_extcon_class(); +} +module_init(extcon_class_init); + +static void __exit extcon_class_exit(void) +{ +#if defined(CONFIG_ANDROID) + class_compat_unregister(switch_class); +#endif + class_destroy(extcon_class); +} +module_exit(extcon_class_exit); + +MODULE_AUTHOR("Mike Lockwood <lockw...@android.com>"); +MODULE_AUTHOR("Donggeun Kim <dg77....@samsung.com>"); +MODULE_AUTHOR("MyungJoo Ham <myungjoo....@samsung.com>"); +MODULE_DESCRIPTION("External connector (extcon) class driver"); +MODULE_LICENSE("GPL"); -- 1.8.5.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/