blob: d9ab99348382274eb49362472a406d40bf5fa533 [file] [log] [blame]
/* 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");