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/*
* Copyright (c) 2015 Brian Swetland
* Copyright (c) 2008 Google, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <malloc.h>
#include <stdio.h>
#include <string.h>
#include <dev/udc.h>
#include "udc-common.h"
static udc_descriptor_t *udc_descriptor_alloc(unsigned type, unsigned num, unsigned len)
{
struct udc_descriptor *desc;
if ((len > 255) || (len < 2) || (num > 255) || (type > 255))
return 0;
if (!(desc = malloc(sizeof(struct udc_descriptor) + len)))
return 0;
desc->next = 0;
desc->tag = (type << 8) | num;
desc->len = len;
desc->data[0] = len;
desc->data[1] = type;
return desc;
}
static udc_descriptor_t langid_list = {
.tag = 0x0300,
.len = 4,
.data = { 0x04, TYPE_STRING, 0x09, 0x04 }, // EN_US
};
static struct udc_descriptor *desc_list = &langid_list;
static unsigned next_string_id = 1;
udc_descriptor_t *udc_descriptor_find(unsigned tag)
{
udc_descriptor_t *desc = desc_list;
while (desc != NULL) {
if (desc->tag == tag) {
return desc;
}
desc = desc->next;
}
printf("cant find %08x\n", tag);
return NULL;
}
static void udc_descriptor_register(struct udc_descriptor *desc)
{
desc->next = desc_list;
desc_list = desc;
}
static unsigned udc_string_desc_alloc(const char *str)
{
unsigned len;
struct udc_descriptor *desc;
unsigned char *data;
if (next_string_id > 255)
return 0;
if (!str)
return 0;
len = strlen(str);
desc = udc_descriptor_alloc(TYPE_STRING, next_string_id, len * 2 + 2);
if (!desc)
return 0;
next_string_id++;
/* expand ascii string to utf16 */
data = desc->data + 2;
while (len-- > 0) {
*data++ = *str++;
*data++ = 0;
}
udc_descriptor_register(desc);
return desc->tag & 0xff;
}
static unsigned udc_ifc_desc_size(udc_gadget_t *g)
{
return 9 + g->ifc_endpoints * 7;
}
static void udc_ifc_desc_fill(udc_gadget_t *g, unsigned ifcn, unsigned char *data)
{
unsigned n;
data[0] = 0x09;
data[1] = TYPE_INTERFACE;
data[2] = ifcn; // ifc number
data[3] = 0x00; // alt number
data[4] = g->ifc_endpoints;
data[5] = g->ifc_class;
data[6] = g->ifc_subclass;
data[7] = g->ifc_protocol;
data[8] = udc_string_desc_alloc(g->ifc_string);
data += 9;
for (n = 0; n < g->ifc_endpoints; n++) {
udc_ept_desc_fill(g->ept[n], data);
data += 7;
}
}
void udc_create_descriptors(udc_device_t *device, udc_gadget_t *gadgetlist)
{
udc_descriptor_t *desc;
udc_gadget_t *gadget;
unsigned size;
uint8_t *data, *p;
uint8_t n;
// create our device descriptor
desc = udc_descriptor_alloc(TYPE_DEVICE, 0, 18);
data = desc->data;
data[2] = 0x00; // usb spec rev 2.00
data[3] = 0x02;
data[4] = 0x00; // class
data[5] = 0x00; // subclass
data[6] = 0x00; // protocol
data[7] = 0x40; // max packet size on ept 0
data[8] = device->vendor_id;
data[9] = device->vendor_id >> 8;
data[10] = device->product_id;
data[11] = device->product_id >> 8;
data[12] = device->version_id;
data[13] = device->version_id >> 8;
data[14] = udc_string_desc_alloc(device->manufacturer);
data[15] = udc_string_desc_alloc(device->product);
data[16] = udc_string_desc_alloc(device->serialno);
data[17] = 1; // number of configurations
udc_descriptor_register(desc);
// create our configuration descriptor
size = 9;
n = 0;
for (gadget = gadgetlist; gadget; gadget = gadget->next) {
size += udc_ifc_desc_size(gadget);
n++;
}
desc = udc_descriptor_alloc(TYPE_CONFIGURATION, 0, size);
data = desc->data;
data[0] = 0x09;
data[2] = size;
data[3] = size >> 8;
data[4] = n; // number of interfaces
data[5] = 0x01; // configuration value
data[6] = 0x00; // configuration string
data[7] = 0x80; // attributes
data[8] = 0x80; // max power (250ma) -- todo fix this
n = 0;
p = data + 9;
for (gadget = gadgetlist; gadget; gadget = gadget->next) {
udc_ifc_desc_fill(gadget, n++, p);
p += udc_ifc_desc_size(gadget);
}
udc_descriptor_register(desc);
}
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