#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/types.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/greybus.h>
#include "gbphy.h"
#define GB_GBPHY_AUTOSUSPEND_MS 3000
struct gbphy_host {
struct gb_bundle *bundle;
struct list_head devices;
};
static DEFINE_IDA(gbphy_id);
static ssize_t protocol_id_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gbphy_device *gbphy_dev = to_gbphy_dev(dev);
return sprintf(buf, "0x%02x\n", gbphy_dev->cport_desc->protocol_id);
}
static DEVICE_ATTR_RO(protocol_id);
static struct attribute *gbphy_dev_attrs[] = {
&dev_attr_protocol_id.attr,
NULL,
};
ATTRIBUTE_GROUPS(gbphy_dev);
static void gbphy_dev_release(struct device *dev)
{
struct gbphy_device *gbphy_dev = to_gbphy_dev(dev);
ida_free(&gbphy_id, gbphy_dev->id);
kfree(gbphy_dev);
}
#ifdef CONFIG_PM
static int gb_gbphy_idle(struct device *dev)
{
pm_runtime_mark_last_busy(dev);
pm_request_autosuspend(dev);
return 0;
}
#endif
static const struct dev_pm_ops gb_gbphy_pm_ops = {
SET_RUNTIME_PM_OPS(pm_generic_runtime_suspend,
pm_generic_runtime_resume,
gb_gbphy_idle)
};
static const struct device_type greybus_gbphy_dev_type = {
.name = "gbphy_device",
.release = gbphy_dev_release,
.pm = &gb_gbphy_pm_ops,
};
static int gbphy_dev_uevent(const struct device *dev, struct kobj_uevent_env *env)
{
const struct gbphy_device *gbphy_dev = to_gbphy_dev(dev);
const struct greybus_descriptor_cport *cport_desc = gbphy_dev->cport_desc;
const struct gb_bundle *bundle = gbphy_dev->bundle;
const struct gb_interface *intf = bundle->intf;
const struct gb_module *module = intf->module;
const struct gb_host_device *hd = intf->hd;
if (add_uevent_var(env, "BUS=%u", hd->bus_id))
return -ENOMEM;
if (add_uevent_var(env, "MODULE=%u", module->module_id))
return -ENOMEM;
if (add_uevent_var(env, "INTERFACE=%u", intf->interface_id))
return -ENOMEM;
if (add_uevent_var(env, "GREYBUS_ID=%08x/%08x",
intf->vendor_id, intf->product_id))
return -ENOMEM;
if (add_uevent_var(env, "BUNDLE=%u", gbphy_dev->bundle->id))
return -ENOMEM;
if (add_uevent_var(env, "BUNDLE_CLASS=%02x", bundle->class))
return -ENOMEM;
if (add_uevent_var(env, "GBPHY=%u", gbphy_dev->id))
return -ENOMEM;
if (add_uevent_var(env, "PROTOCOL_ID=%02x", cport_desc->protocol_id))
return -ENOMEM;
return 0;
}
static const struct gbphy_device_id *
gbphy_dev_match_id(const struct gbphy_device *gbphy_dev,
const struct gbphy_driver *gbphy_drv)
{
const struct gbphy_device_id *id = gbphy_drv->id_table;
if (!id)
return NULL;
for (; id->protocol_id; id++)
if (id->protocol_id == gbphy_dev->cport_desc->protocol_id)
return id;
return NULL;
}
static int gbphy_dev_match(struct device *dev, const struct device_driver *drv)
{
const struct gbphy_driver *gbphy_drv = to_gbphy_driver(drv);
struct gbphy_device *gbphy_dev = to_gbphy_dev(dev);
const struct gbphy_device_id *id;
id = gbphy_dev_match_id(gbphy_dev, gbphy_drv);
if (id)
return 1;
return 0;
}
static int gbphy_dev_probe(struct device *dev)
{
struct gbphy_driver *gbphy_drv = to_gbphy_driver(dev->driver);
struct gbphy_device *gbphy_dev = to_gbphy_dev(dev);
const struct gbphy_device_id *id;
int ret;
id = gbphy_dev_match_id(gbphy_dev, gbphy_drv);
if (!id)
return -ENODEV;
ret = gb_pm_runtime_get_sync(gbphy_dev->bundle);
if (ret < 0)
return ret;
pm_runtime_set_autosuspend_delay(dev, GB_GBPHY_AUTOSUSPEND_MS);
pm_runtime_use_autosuspend(dev);
pm_runtime_get_noresume(dev);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
ret = gbphy_drv->probe(gbphy_dev, id);
if (ret) {
pm_runtime_disable(dev);
pm_runtime_set_suspended(dev);
pm_runtime_put_noidle(dev);
pm_runtime_dont_use_autosuspend(dev);
}
gb_pm_runtime_put_autosuspend(gbphy_dev->bundle);
return ret;
}
static void gbphy_dev_remove(struct device *dev)
{
struct gbphy_driver *gbphy_drv = to_gbphy_driver(dev->driver);
struct gbphy_device *gbphy_dev = to_gbphy_dev(dev);
gbphy_drv->remove(gbphy_dev);
pm_runtime_disable(dev);
pm_runtime_set_suspended(dev);
pm_runtime_put_noidle(dev);
pm_runtime_dont_use_autosuspend(dev);
}
static const struct bus_type gbphy_bus_type = {
.name = "gbphy",
.match = gbphy_dev_match,
.probe = gbphy_dev_probe,
.remove = gbphy_dev_remove,
.uevent = gbphy_dev_uevent,
};
int gb_gbphy_register_driver(struct gbphy_driver *driver,
struct module *owner, const char *mod_name)
{
int retval;
if (greybus_disabled())
return -ENODEV;
driver->driver.bus = &gbphy_bus_type;
driver->driver.name = driver->name;
driver->driver.owner = owner;
driver->driver.mod_name = mod_name;
retval = driver_register(&driver->driver);
if (retval)
return retval;
pr_info("registered new driver %s\n", driver->name);
return 0;
}
EXPORT_SYMBOL_GPL(gb_gbphy_register_driver);
void gb_gbphy_deregister_driver(struct gbphy_driver *driver)
{
driver_unregister(&driver->driver);
}
EXPORT_SYMBOL_GPL(gb_gbphy_deregister_driver);
static struct gbphy_device *gb_gbphy_create_dev(struct gb_bundle *bundle,
struct greybus_descriptor_cport *cport_desc)
{
struct gbphy_device *gbphy_dev;
int retval;
int id;
id = ida_alloc_min(&gbphy_id, 1, GFP_KERNEL);
if (id < 0)
return ERR_PTR(id);
gbphy_dev = kzalloc_obj(*gbphy_dev);
if (!gbphy_dev) {
ida_free(&gbphy_id, id);
return ERR_PTR(-ENOMEM);
}
gbphy_dev->id = id;
gbphy_dev->bundle = bundle;
gbphy_dev->cport_desc = cport_desc;
gbphy_dev->dev.parent = &bundle->dev;
gbphy_dev->dev.bus = &gbphy_bus_type;
gbphy_dev->dev.type = &greybus_gbphy_dev_type;
gbphy_dev->dev.groups = gbphy_dev_groups;
gbphy_dev->dev.dma_mask = bundle->dev.dma_mask;
dev_set_name(&gbphy_dev->dev, "gbphy%d", id);
retval = device_register(&gbphy_dev->dev);
if (retval) {
put_device(&gbphy_dev->dev);
return ERR_PTR(retval);
}
return gbphy_dev;
}
static void gb_gbphy_disconnect(struct gb_bundle *bundle)
{
struct gbphy_host *gbphy_host = greybus_get_drvdata(bundle);
struct gbphy_device *gbphy_dev, *temp;
int ret;
ret = gb_pm_runtime_get_sync(bundle);
if (ret < 0)
gb_pm_runtime_get_noresume(bundle);
list_for_each_entry_safe(gbphy_dev, temp, &gbphy_host->devices, list) {
list_del(&gbphy_dev->list);
device_unregister(&gbphy_dev->dev);
}
kfree(gbphy_host);
}
static int gb_gbphy_probe(struct gb_bundle *bundle,
const struct greybus_bundle_id *id)
{
struct gbphy_host *gbphy_host;
struct gbphy_device *gbphy_dev;
int i;
if (bundle->num_cports == 0)
return -ENODEV;
gbphy_host = kzalloc_obj(*gbphy_host);
if (!gbphy_host)
return -ENOMEM;
gbphy_host->bundle = bundle;
INIT_LIST_HEAD(&gbphy_host->devices);
greybus_set_drvdata(bundle, gbphy_host);
for (i = 0; i < bundle->num_cports; ++i) {
gbphy_dev = gb_gbphy_create_dev(bundle, &bundle->cport_desc[i]);
if (IS_ERR(gbphy_dev)) {
gb_gbphy_disconnect(bundle);
return PTR_ERR(gbphy_dev);
}
list_add(&gbphy_dev->list, &gbphy_host->devices);
}
gb_pm_runtime_put_autosuspend(bundle);
return 0;
}
static const struct greybus_bundle_id gb_gbphy_id_table[] = {
{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_BRIDGED_PHY) },
{ },
};
MODULE_DEVICE_TABLE(greybus, gb_gbphy_id_table);
static struct greybus_driver gb_gbphy_driver = {
.name = "gbphy",
.probe = gb_gbphy_probe,
.disconnect = gb_gbphy_disconnect,
.id_table = gb_gbphy_id_table,
};
static int __init gbphy_init(void)
{
int retval;
retval = bus_register(&gbphy_bus_type);
if (retval) {
pr_err("gbphy bus register failed (%d)\n", retval);
return retval;
}
retval = greybus_register(&gb_gbphy_driver);
if (retval) {
pr_err("error registering greybus driver\n");
goto error_gbphy;
}
return 0;
error_gbphy:
bus_unregister(&gbphy_bus_type);
ida_destroy(&gbphy_id);
return retval;
}
module_init(gbphy_init);
static void __exit gbphy_exit(void)
{
greybus_deregister(&gb_gbphy_driver);
bus_unregister(&gbphy_bus_type);
ida_destroy(&gbphy_id);
}
module_exit(gbphy_exit);
MODULE_DESCRIPTION("Greybus Bridged-Phy Bus driver");
MODULE_LICENSE("GPL v2");
