| /* Copyright (c) 2013-2015, 2017, The Linux Foundation. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 and |
| * only version 2 as published by the Free Software Foundation. |
| * |
| * 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/idr.h> |
| #include <linux/slab.h> |
| #include "esoc.h" |
| |
| static DEFINE_IDA(esoc_ida); |
| |
| /* SYSFS */ |
| static ssize_t |
| esoc_name_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| return snprintf(buf, ESOC_NAME_LEN, "%s", to_esoc_clink(dev)->name); |
| } |
| |
| static ssize_t |
| esoc_link_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| return snprintf(buf, ESOC_LINK_LEN, "%s", |
| to_esoc_clink(dev)->link_name); |
| } |
| |
| static ssize_t |
| esoc_link_info_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| return snprintf(buf, ESOC_LINK_LEN, "%s", |
| to_esoc_clink(dev)->link_info); |
| } |
| |
| static struct device_attribute esoc_clink_attrs[] = { |
| |
| __ATTR_RO(esoc_name), |
| __ATTR_RO(esoc_link), |
| __ATTR_RO(esoc_link_info), |
| __ATTR_NULL, |
| }; |
| |
| static int esoc_bus_match(struct device *dev, struct device_driver *drv) |
| { |
| int i = 0, match = 1; |
| struct esoc_clink *esoc_clink = to_esoc_clink(dev); |
| struct esoc_drv *esoc_drv = to_esoc_drv(drv); |
| int entries = esoc_drv->compat_entries; |
| struct esoc_compat *table = esoc_drv->compat_table; |
| |
| for (i = 0; i < entries; i++) { |
| if (strcasecmp(esoc_clink->name, table[i].name) == 0) |
| return match; |
| } |
| return 0; |
| } |
| |
| static int esoc_bus_probe(struct device *dev) |
| { |
| int ret; |
| struct esoc_clink *esoc_clink = to_esoc_clink(dev); |
| struct esoc_drv *esoc_drv = to_esoc_drv(dev->driver); |
| |
| ret = esoc_drv->probe(esoc_clink, esoc_drv); |
| if (ret) { |
| pr_err("failed to probe %s dev\n", esoc_clink->name); |
| return ret; |
| } |
| return 0; |
| } |
| |
| struct bus_type esoc_bus_type = { |
| .name = "esoc", |
| .match = esoc_bus_match, |
| .dev_attrs = esoc_clink_attrs, |
| }; |
| EXPORT_SYMBOL(esoc_bus_type); |
| |
| struct device esoc_bus = { |
| .init_name = "esoc-bus" |
| }; |
| EXPORT_SYMBOL(esoc_bus); |
| |
| /* bus accessor */ |
| static void esoc_clink_release(struct device *dev) |
| { |
| struct esoc_clink *esoc_clink = to_esoc_clink(dev); |
| |
| ida_simple_remove(&esoc_ida, esoc_clink->id); |
| kfree(esoc_clink); |
| } |
| |
| static int esoc_clink_match_id(struct device *dev, void *id) |
| { |
| struct esoc_clink *esoc_clink = to_esoc_clink(dev); |
| int *esoc_id = (int *)id; |
| |
| if (esoc_clink->id == *esoc_id) { |
| if (!try_module_get(esoc_clink->owner)) |
| return 0; |
| return 1; |
| } |
| return 0; |
| } |
| |
| static int esoc_clink_match_node(struct device *dev, void *id) |
| { |
| struct esoc_clink *esoc_clink = to_esoc_clink(dev); |
| struct device_node *node = id; |
| |
| if (esoc_clink->np == node) { |
| if (!try_module_get(esoc_clink->owner)) |
| return 0; |
| return 1; |
| } |
| return 0; |
| } |
| |
| void esoc_for_each_dev(void *data, int (*fn)(struct device *dev, void *)) |
| { |
| int ret; |
| |
| ret = bus_for_each_dev(&esoc_bus_type, NULL, data, fn); |
| } |
| EXPORT_SYMBOL(esoc_for_each_dev); |
| |
| struct esoc_clink *get_esoc_clink(int id) |
| { |
| struct esoc_clink *esoc_clink; |
| struct device *dev; |
| |
| dev = bus_find_device(&esoc_bus_type, NULL, &id, esoc_clink_match_id); |
| if (IS_ERR_OR_NULL(dev)) |
| return NULL; |
| esoc_clink = to_esoc_clink(dev); |
| return esoc_clink; |
| } |
| EXPORT_SYMBOL(get_esoc_clink); |
| |
| struct esoc_clink *get_esoc_clink_by_node(struct device_node *node) |
| { |
| struct esoc_clink *esoc_clink; |
| struct device *dev; |
| |
| dev = bus_find_device(&esoc_bus_type, NULL, node, |
| esoc_clink_match_node); |
| if (IS_ERR_OR_NULL(dev)) |
| return NULL; |
| esoc_clink = to_esoc_clink(dev); |
| return esoc_clink; |
| } |
| |
| void put_esoc_clink(struct esoc_clink *esoc_clink) |
| { |
| module_put(esoc_clink->owner); |
| } |
| EXPORT_SYMBOL(put_esoc_clink); |
| |
| bool esoc_req_eng_enabled(struct esoc_clink *esoc_clink) |
| { |
| return !esoc_clink->req_eng ? false : true; |
| } |
| EXPORT_SYMBOL(esoc_req_eng_enabled); |
| |
| bool esoc_cmd_eng_enabled(struct esoc_clink *esoc_clink) |
| { |
| return !esoc_clink->cmd_eng ? false : true; |
| } |
| EXPORT_SYMBOL(esoc_cmd_eng_enabled); |
| /* ssr operations */ |
| int esoc_clink_register_ssr(struct esoc_clink *esoc_clink) |
| { |
| int ret; |
| int len; |
| char *subsys_name; |
| |
| len = strlen("esoc") + sizeof(esoc_clink->id); |
| subsys_name = kzalloc(len, GFP_KERNEL); |
| if (IS_ERR_OR_NULL(subsys_name)) |
| return PTR_ERR(subsys_name); |
| snprintf(subsys_name, len, "esoc%d", esoc_clink->id); |
| esoc_clink->subsys.name = subsys_name; |
| esoc_clink->dev.of_node = esoc_clink->np; |
| esoc_clink->subsys.dev = &esoc_clink->pdev->dev; |
| esoc_clink->subsys_dev = subsys_register(&esoc_clink->subsys); |
| if (IS_ERR_OR_NULL(esoc_clink->subsys_dev)) { |
| dev_err(&esoc_clink->dev, "failed to register ssr node\n"); |
| ret = PTR_ERR(esoc_clink->subsys_dev); |
| goto subsys_err; |
| } |
| return 0; |
| subsys_err: |
| kfree(subsys_name); |
| return ret; |
| } |
| EXPORT_SYMBOL(esoc_clink_register_ssr); |
| |
| void esoc_clink_unregister_ssr(struct esoc_clink *esoc_clink) |
| { |
| subsys_unregister(esoc_clink->subsys_dev); |
| kfree(esoc_clink->subsys.name); |
| } |
| EXPORT_SYMBOL(esoc_clink_unregister_ssr); |
| |
| int esoc_clink_request_ssr(struct esoc_clink *esoc_clink) |
| { |
| subsystem_restart_dev(esoc_clink->subsys_dev); |
| return 0; |
| } |
| EXPORT_SYMBOL(esoc_clink_request_ssr); |
| |
| /* bus operations */ |
| void esoc_clink_evt_notify(enum esoc_evt evt, struct esoc_clink *esoc_clink) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&esoc_clink->notify_lock, flags); |
| notify_esoc_clients(esoc_clink, evt); |
| if (esoc_clink->req_eng && esoc_clink->req_eng->handle_clink_evt) |
| esoc_clink->req_eng->handle_clink_evt(evt, esoc_clink->req_eng); |
| if (esoc_clink->cmd_eng && esoc_clink->cmd_eng->handle_clink_evt) |
| esoc_clink->cmd_eng->handle_clink_evt(evt, esoc_clink->cmd_eng); |
| spin_unlock_irqrestore(&esoc_clink->notify_lock, flags); |
| } |
| EXPORT_SYMBOL(esoc_clink_evt_notify); |
| |
| void *get_esoc_clink_data(struct esoc_clink *esoc) |
| { |
| return esoc->clink_data; |
| } |
| EXPORT_SYMBOL(get_esoc_clink_data); |
| |
| void set_esoc_clink_data(struct esoc_clink *esoc, void *data) |
| { |
| esoc->clink_data = data; |
| } |
| EXPORT_SYMBOL(set_esoc_clink_data); |
| |
| void esoc_clink_queue_request(enum esoc_req req, struct esoc_clink *esoc_clink) |
| { |
| unsigned long flags; |
| struct esoc_eng *req_eng; |
| |
| spin_lock_irqsave(&esoc_clink->notify_lock, flags); |
| if (esoc_clink->req_eng != NULL) { |
| req_eng = esoc_clink->req_eng; |
| req_eng->handle_clink_req(req, req_eng); |
| } |
| spin_unlock_irqrestore(&esoc_clink->notify_lock, flags); |
| } |
| EXPORT_SYMBOL(esoc_clink_queue_request); |
| |
| void esoc_set_drv_data(struct esoc_clink *esoc_clink, void *data) |
| { |
| dev_set_drvdata(&esoc_clink->dev, data); |
| } |
| EXPORT_SYMBOL(esoc_set_drv_data); |
| |
| void *esoc_get_drv_data(struct esoc_clink *esoc_clink) |
| { |
| return dev_get_drvdata(&esoc_clink->dev); |
| } |
| EXPORT_SYMBOL(esoc_get_drv_data); |
| |
| /* bus registration functions */ |
| void esoc_clink_unregister(struct esoc_clink *esoc_clink) |
| { |
| if (get_device(&esoc_clink->dev) != NULL) { |
| device_unregister(&esoc_clink->dev); |
| put_device(&esoc_clink->dev); |
| } |
| } |
| EXPORT_SYMBOL(esoc_clink_unregister); |
| |
| int esoc_clink_register(struct esoc_clink *esoc_clink) |
| { |
| int id, err; |
| struct device *dev; |
| |
| if (!esoc_clink->name || !esoc_clink->link_name || |
| !esoc_clink->clink_ops) { |
| dev_err(esoc_clink->parent, "invalid esoc arguments\n"); |
| return -EINVAL; |
| } |
| id = ida_simple_get(&esoc_ida, 0, ESOC_DEV_MAX, GFP_KERNEL); |
| if (id < 0) { |
| err = id; |
| goto exit_ida; |
| } |
| esoc_clink->id = id; |
| dev = &esoc_clink->dev; |
| dev->bus = &esoc_bus_type; |
| dev->release = esoc_clink_release; |
| if (!esoc_clink->parent) |
| dev->parent = &esoc_bus; |
| else |
| dev->parent = esoc_clink->parent; |
| dev_set_name(dev, "esoc%d", id); |
| err = device_register(dev); |
| if (err) { |
| dev_err(esoc_clink->parent, "esoc device register failed\n"); |
| goto exit_ida; |
| } |
| spin_lock_init(&esoc_clink->notify_lock); |
| return 0; |
| exit_ida: |
| ida_simple_remove(&esoc_ida, id); |
| pr_err("unable to register %s, err = %d\n", esoc_clink->name, err); |
| return err; |
| } |
| EXPORT_SYMBOL(esoc_clink_register); |
| |
| int esoc_clink_register_req_eng(struct esoc_clink *esoc_clink, |
| struct esoc_eng *eng) |
| { |
| if (esoc_clink->req_eng) |
| return -EBUSY; |
| if (!eng->handle_clink_req) |
| return -EINVAL; |
| esoc_clink->req_eng = eng; |
| eng->esoc_clink = esoc_clink; |
| esoc_clink_evt_notify(ESOC_REQ_ENG_ON, esoc_clink); |
| return 0; |
| } |
| EXPORT_SYMBOL(esoc_clink_register_req_eng); |
| |
| int esoc_clink_register_cmd_eng(struct esoc_clink *esoc_clink, |
| struct esoc_eng *eng) |
| { |
| if (esoc_clink->cmd_eng) |
| return -EBUSY; |
| esoc_clink->cmd_eng = eng; |
| eng->esoc_clink = esoc_clink; |
| esoc_clink_evt_notify(ESOC_CMD_ENG_ON, esoc_clink); |
| return 0; |
| } |
| EXPORT_SYMBOL(esoc_clink_register_cmd_eng); |
| |
| void esoc_clink_unregister_req_eng(struct esoc_clink *esoc_clink, |
| struct esoc_eng *eng) |
| { |
| esoc_clink->req_eng = NULL; |
| esoc_clink_evt_notify(ESOC_REQ_ENG_OFF, esoc_clink); |
| } |
| EXPORT_SYMBOL(esoc_clink_unregister_req_eng); |
| |
| void esoc_clink_unregister_cmd_eng(struct esoc_clink *esoc_clink, |
| struct esoc_eng *eng) |
| { |
| esoc_clink->cmd_eng = NULL; |
| esoc_clink_evt_notify(ESOC_CMD_ENG_OFF, esoc_clink); |
| } |
| EXPORT_SYMBOL(esoc_clink_unregister_cmd_eng); |
| |
| int esoc_drv_register(struct esoc_drv *driver) |
| { |
| int ret; |
| |
| driver->driver.bus = &esoc_bus_type; |
| driver->driver.probe = esoc_bus_probe; |
| ret = driver_register(&driver->driver); |
| if (ret) |
| return ret; |
| return 0; |
| } |
| EXPORT_SYMBOL(esoc_drv_register); |
| |
| static int __init esoc_init(void) |
| { |
| int ret; |
| |
| ret = device_register(&esoc_bus); |
| if (ret) { |
| pr_err("esoc bus device register fail\n"); |
| return ret; |
| } |
| ret = bus_register(&esoc_bus_type); |
| if (ret) { |
| pr_err("esoc bus register fail\n"); |
| return ret; |
| } |
| pr_debug("esoc bus registration done\n"); |
| return 0; |
| } |
| |
| subsys_initcall(esoc_init); |
| MODULE_LICENSE("GPL v2"); |