1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
/*
* USB host driver for the Greybus "generic" USB module.
*
* Copyright 2014 Google Inc.
* Copyright 2014 Linaro Ltd.
*
* Released under the GPLv2 only.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include "greybus.h"
/* Version of the Greybus USB protocol we support */
#define GB_USB_VERSION_MAJOR 0x00
#define GB_USB_VERSION_MINOR 0x01
/* 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;
};
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->connection->bundle->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->connection->bundle->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 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_connection_init(struct gb_connection *connection)
{
struct device *dev = &connection->bundle->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;
gb_usb_dev = to_gb_usb_device(hcd);
gb_usb_dev->connection = connection;
connection->private = gb_usb_dev;
hcd->has_tt = 1;
/*
* 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 err_put_hcd;
}
retval = usb_add_hcd(hcd, 0, 0);
if (retval)
goto err_put_hcd;
return 0;
err_put_hcd:
usb_put_hcd(hcd);
return retval;
}
static void gb_usb_connection_exit(struct gb_connection *connection)
{
struct gb_usb_device *gb_usb_dev = connection->private;
struct usb_hcd *hcd = gb_usb_device_to_hcd(gb_usb_dev);
usb_remove_hcd(hcd);
usb_put_hcd(hcd);
}
static struct gb_protocol usb_protocol = {
.name = "usb",
.id = GREYBUS_PROTOCOL_USB,
.major = GB_USB_VERSION_MAJOR,
.minor = GB_USB_VERSION_MINOR,
.connection_init = gb_usb_connection_init,
.connection_exit = gb_usb_connection_exit,
.request_recv = NULL, /* FIXME we have requests!!! */
};
gb_builtin_protocol_driver(usb_protocol);
|
