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