diff options
Diffstat (limited to 'drivers/esoc/esoc_bus.c')
| -rw-r--r-- | drivers/esoc/esoc_bus.c | 395 |
1 files changed, 395 insertions, 0 deletions
diff --git a/drivers/esoc/esoc_bus.c b/drivers/esoc/esoc_bus.c new file mode 100644 index 000000000000..94f52764c8c3 --- /dev/null +++ b/drivers/esoc/esoc_bus.c @@ -0,0 +1,395 @@ +/* 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); + return; +} +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"); |