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// SPDX-License-Identifier: GPL-2.0
/*
* USB host driver for the Greybus "generic" USB module.
*
* Copyright 2014 Google Inc.
* Copyright 2014 Linaro Ltd.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include <linux/greybus.h>
#include "gbphy.h"
/* Greybus USB request types */
#define GB_USB_TYPE_HCD_START 0x02
#define GB_USB_TYPE_HCD_STOP 0x03
#define GB_USB_TYPE_HUB_CONTROL 0x04
struct gb_usb_hub_control_request {
__le16 typeReq;
__le16 wValue;
__le16 wIndex;
__le16 wLength;
};
struct gb_usb_hub_control_response {
u8 buf[0];
};
struct gb_usb_device {
struct gb_connection *connection;
struct gbphy_device *gbphy_dev;
};
static inline struct gb_usb_device *to_gb_usb_device(struct usb_hcd *hcd)
{
return (struct gb_usb_device *)hcd->hcd_priv;
}
static inline struct usb_hcd *gb_usb_device_to_hcd(struct gb_usb_device *dev)
{
return container_of((void *)dev, struct usb_hcd, hcd_priv);
}
static void hcd_stop(struct usb_hcd *hcd)
{
struct gb_usb_device *dev = to_gb_usb_device(hcd);
int ret;
ret = gb_operation_sync(dev->connection, GB_USB_TYPE_HCD_STOP,
NULL, 0, NULL, 0);
if (ret)
dev_err(&dev->gbphy_dev->dev, "HCD stop failed '%d'\n", ret);
}
static int hcd_start(struct usb_hcd *hcd)
{
struct usb_bus *bus = hcd_to_bus(hcd);
struct gb_usb_device *dev = to_gb_usb_device(hcd);
int ret;
ret = gb_operation_sync(dev->connection, GB_USB_TYPE_HCD_START,
NULL, 0, NULL, 0);
if (ret) {
dev_err(&dev->gbphy_dev->dev, "HCD start failed '%d'\n", ret);
return ret;
}
hcd->state = HC_STATE_RUNNING;
if (bus->root_hub)
usb_hcd_resume_root_hub(hcd);
return 0;
}
static int urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
{
return -ENXIO;
}
static int urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
{
return -ENXIO;
}
static int get_frame_number(struct usb_hcd *hcd)
{
return 0;
}
static int hub_status_data(struct usb_hcd *hcd, char *buf)
{
return 0;
}
static int hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, u16 wIndex,
char *buf, u16 wLength)
{
struct gb_usb_device *dev = to_gb_usb_device(hcd);
struct gb_operation *operation;
struct gb_usb_hub_control_request *request;
struct gb_usb_hub_control_response *response;
size_t response_size;
int ret;
/* FIXME: handle unspecified lengths */
response_size = sizeof(*response) + wLength;
operation = gb_operation_create(dev->connection,
GB_USB_TYPE_HUB_CONTROL,
sizeof(*request),
response_size,
GFP_KERNEL);
if (!operation)
return -ENOMEM;
request = operation->request->payload;
request->typeReq = cpu_to_le16(typeReq);
request->wValue = cpu_to_le16(wValue);
request->wIndex = cpu_to_le16(wIndex);
request->wLength = cpu_to_le16(wLength);
ret = gb_operation_request_send_sync(operation);
if (ret)
goto out;
if (wLength) {
/* Greybus core has verified response size */
response = operation->response->payload;
memcpy(buf, response->buf, wLength);
}
out:
gb_operation_put(operation);
return ret;
}
static const struct hc_driver usb_gb_hc_driver = {
.description = "greybus-hcd",
.product_desc = "Greybus USB Host Controller",
.hcd_priv_size = sizeof(struct gb_usb_device),
.flags = HCD_USB2,
.start = hcd_start,
.stop = hcd_stop,
.urb_enqueue = urb_enqueue,
.urb_dequeue = urb_dequeue,
.get_frame_number = get_frame_number,
.hub_status_data = hub_status_data,
.hub_control = hub_control,
};
static int gb_usb_probe(struct gbphy_device *gbphy_dev,
const struct gbphy_device_id *id)
{
struct gb_connection *connection;
struct device *dev = &gbphy_dev->dev;
struct gb_usb_device *gb_usb_dev;
struct usb_hcd *hcd;
int retval;
hcd = usb_create_hcd(&usb_gb_hc_driver, dev, dev_name(dev));
if (!hcd)
return -ENOMEM;
connection = gb_connection_create(gbphy_dev->bundle,
le16_to_cpu(gbphy_dev->cport_desc->id),
NULL);
if (IS_ERR(connection)) {
retval = PTR_ERR(connection);
goto exit_usb_put;
}
gb_usb_dev = to_gb_usb_device(hcd);
gb_usb_dev->connection = connection;
gb_connection_set_data(connection, gb_usb_dev);
gb_usb_dev->gbphy_dev = gbphy_dev;
gb_gbphy_set_data(gbphy_dev, gb_usb_dev);
hcd->has_tt = 1;
retval = gb_connection_enable(connection);
if (retval)
goto exit_connection_destroy;
/*
* FIXME: The USB bridged-PHY protocol driver depends on changes to
* USB core which are not yet upstream.
*
* Disable for now.
*/
if (1) {
dev_warn(dev, "USB protocol disabled\n");
retval = -EPROTONOSUPPORT;
goto exit_connection_disable;
}
retval = usb_add_hcd(hcd, 0, 0);
if (retval)
goto exit_connection_disable;
return 0;
exit_connection_disable:
gb_connection_disable(connection);
exit_connection_destroy:
gb_connection_destroy(connection);
exit_usb_put:
usb_put_hcd(hcd);
return retval;
}
static void gb_usb_remove(struct gbphy_device *gbphy_dev)
{
struct gb_usb_device *gb_usb_dev = gb_gbphy_get_data(gbphy_dev);
struct gb_connection *connection = gb_usb_dev->connection;
struct usb_hcd *hcd = gb_usb_device_to_hcd(gb_usb_dev);
usb_remove_hcd(hcd);
gb_connection_disable(connection);
gb_connection_destroy(connection);
usb_put_hcd(hcd);
}
static const struct gbphy_device_id gb_usb_id_table[] = {
{ GBPHY_PROTOCOL(GREYBUS_PROTOCOL_USB) },
{ },
};
MODULE_DEVICE_TABLE(gbphy, gb_usb_id_table);
static struct gbphy_driver usb_driver = {
.name = "usb",
.probe = gb_usb_probe,
.remove = gb_usb_remove,
.id_table = gb_usb_id_table,
};
module_gbphy_driver(usb_driver);
MODULE_LICENSE("GPL v2");
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