contiki/cpu/arm/common/usb/usb-core.c

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#include <usb-core.h>
#include <usb.h>
#include <usb-arch.h>
#include <usb-api.h>
#include <stdio.h>
#include <sys/process.h>
#include <stdio.h>
#include <descriptors.h>
#include <string-descriptors.h>
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#define DEBUG
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#ifdef DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
struct USB_request_st usb_setup_buffer;
static USBBuffer ctrl_buffer;
#define SETUP_ID 1
#define OUT_ID 2
#define IN_ID 3
#define STATUS_OUT_ID 4
#define STATUS_IN_ID 5
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static uint16_t usb_device_status;
static uint8_t usb_configuration_value;
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static struct USBRequestHandlerHook *usb_request_handler_hooks = NULL;
static const unsigned char zero_byte = 0;
static const unsigned short zero_word = 0;
static unsigned char usb_flags = 0;
#define USB_FLAG_ADDRESS_PENDING 0x01
static struct process *global_user_event_pocess = NULL;
static unsigned int global_user_events = 0;
void
usb_set_global_event_process(struct process *p)
{
global_user_event_pocess = p;
}
unsigned int
usb_get_global_events(void)
{
unsigned int e = global_user_events;
global_user_events = 0;
return e;
}
static void
notify_user(unsigned int e)
{
global_user_events |= e;
if (global_user_event_pocess) {
process_poll(global_user_event_pocess);
}
}
void
usb_send_ctrl_response(const uint8_t *data, unsigned int len)
{
if (ctrl_buffer.flags & USB_BUFFER_SUBMITTED) return;
if (len >= usb_setup_buffer.wLength) {
len = usb_setup_buffer.wLength; /* Truncate if too long */
}
ctrl_buffer.flags = USB_BUFFER_NOTIFY | USB_BUFFER_IN;
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if (len < usb_setup_buffer.wLength) {
ctrl_buffer.flags |= USB_BUFFER_SHORT_END;
}
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ctrl_buffer.next = NULL;
ctrl_buffer.data = (uint8_t*)data;
ctrl_buffer.left = len;
ctrl_buffer.id = IN_ID;
usb_submit_xmit_buffer(0,&ctrl_buffer);
}
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static uint8_t error_stall = 0;
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void
usb_error_stall()
{
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error_stall = 1;
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usb_arch_control_stall(0);
}
void
usb_send_ctrl_status()
{
if (ctrl_buffer.flags & USB_BUFFER_SUBMITTED) return;
ctrl_buffer.flags = USB_BUFFER_NOTIFY | USB_BUFFER_IN;
ctrl_buffer.next = NULL;
ctrl_buffer.data = NULL;
ctrl_buffer.left = 0;
ctrl_buffer.id = STATUS_IN_ID;
usb_submit_xmit_buffer(0,&ctrl_buffer);
}
static usb_ctrl_data_callback data_callback = NULL;
static uint8_t *ctrl_data = NULL;
static unsigned int ctrl_data_len = 0;
void
usb_get_ctrl_data(uint8_t *data, unsigned int length,
usb_ctrl_data_callback cb)
{
if (ctrl_buffer.flags & USB_BUFFER_SUBMITTED) return;
PRINTF("usb_get_ctrl_data: %d\n",length);
data_callback = cb;
ctrl_data = data;
ctrl_data_len = length;
ctrl_buffer.flags = USB_BUFFER_NOTIFY;
ctrl_buffer.next = NULL;
ctrl_buffer.data = data;
ctrl_buffer.left = length;
ctrl_buffer.id = OUT_ID;
usb_submit_recv_buffer(0,&ctrl_buffer);
}
#if 0
void
usb_set_user_process(struct process *p)
{
user_process = p;
}
#endif
static void
get_device_descriptor()
{
usb_send_ctrl_response((unsigned char*)&device_descriptor, sizeof(device_descriptor));
}
static void
get_string_descriptor()
{
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#if OLD_STRING_DESCR
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if (LOW_BYTE(usb_setup_buffer.wValue) == 0) {
usb_send_ctrl_response((const unsigned char*)string_languages->lang_descr,
string_languages->lang_descr->bLength);
} else {
const struct usb_st_string_descriptor *descriptor;
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unsigned char l;
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const struct usb_st_string_descriptor * const *table;
const struct usb_st_string_language_map *map;
if (LOW_BYTE(usb_setup_buffer.wValue) > string_languages->max_index) {
usb_error_stall();
return;
}
l = string_languages->num_lang;
map = string_languages->map;
table = map->descriptors; /* Use first table if language not found */
while (l > 0) {
if (map->lang_id == usb_setup_buffer.wIndex) {
table = map->descriptors;
break;
}
map++;
l--;
}
PRINTF("Lang id %04x = table %p\n", usb_setup_buffer.wIndex, (void*)table);
descriptor = table[LOW_BYTE(usb_setup_buffer.wValue) - 1];
usb_send_ctrl_response((const unsigned char*)descriptor,
descriptor->bLength);
}
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#else
const struct usb_st_string_descriptor *descriptor;
descriptor = (struct usb_st_string_descriptor*)
usb_class_get_string_descriptor(usb_setup_buffer.wIndex,
LOW_BYTE(usb_setup_buffer.wValue));
if (!descriptor) {
usb_error_stall();
return;
}
usb_send_ctrl_response((const unsigned char*)descriptor,
descriptor->bLength);
#endif
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}
static void
get_configuration_descriptor()
{
usb_send_ctrl_response((unsigned char*)configuration_head,
configuration_head->wTotalLength);
}
static void
get_configuration()
{
usb_send_ctrl_response((unsigned char*)&usb_configuration_value,
sizeof(usb_configuration_value));
}
/* Returns true if the configuration value changed */
static int
set_configuration()
{
notify_user(USB_EVENT_CONFIG);
if (usb_configuration_value != LOW_BYTE(usb_setup_buffer.wValue)) {
usb_configuration_value = LOW_BYTE(usb_setup_buffer.wValue);
usb_arch_set_configuration(usb_configuration_value);
usb_send_ctrl_status();
return 1;
} else {
usb_send_ctrl_status();
return 0;
}
}
static void
get_device_status()
{
PRINTF("get_device_status\n");
usb_send_ctrl_response((const unsigned char*)&usb_device_status,
sizeof(usb_device_status));
}
static void
get_endpoint_status()
{
static uint16_t status;
PRINTF("get_endpoint_status\n");
if ((usb_setup_buffer.wIndex & 0x7f) == 0) {
usb_send_ctrl_response((const unsigned char*)&zero_word,
sizeof(zero_word));
} else {
status = usb_arch_get_ep_status(usb_setup_buffer.wIndex);
usb_send_ctrl_response((uint8_t*)&status, sizeof(status));
}
}
static void
get_interface_status()
{
PRINTF("get_interface_status\n");
usb_send_ctrl_response((const unsigned char*)&zero_word,
sizeof(zero_word));
}
static void
get_interface()
{
PRINTF("get_interface\n");
if (usb_configuration_value == 0) usb_error_stall();
else {
usb_send_ctrl_response(&zero_byte,
sizeof(zero_byte));
}
}
static unsigned int
handle_standard_requests()
{
switch(usb_setup_buffer.bmRequestType) {
case 0x80: /* standard device IN requests */
switch(usb_setup_buffer.bRequest) {
case GET_DESCRIPTOR:
switch (HIGH_BYTE(usb_setup_buffer.wValue)) {
case DEVICE:
get_device_descriptor();
break;
case CONFIGURATION:
get_configuration_descriptor();
break;
case STRING:
get_string_descriptor();
break;
default:
/* Unknown descriptor */
return 0;
}
break;
case GET_CONFIGURATION:
get_configuration();
break;
case GET_STATUS:
get_device_status();
break;
case GET_INTERFACE:
get_interface();
break;
default:
return 0;
}
break;
case 0x81: /* standard interface IN requests */
switch(usb_setup_buffer.bRequest) {
case GET_STATUS:
get_interface_status();
break;
#ifdef HID_ENABLED
case GET_DESCRIPTOR:
switch (USB_setup_buffer.wValue.byte.high) {
case REPORT:
get_report_descriptor();
break;
}
break;
#endif
default:
return 0;
}
break;
case 0x82: /* standard endpoint IN requests */
switch(usb_setup_buffer.bRequest) {
case GET_STATUS:
get_endpoint_status();
break;
default:
return 0;
}
break;
case 0x00: /* standard device OUT requests */
switch(usb_setup_buffer.bRequest) {
case SET_ADDRESS:
PRINTF("Address: %d\n", LOW_BYTE(usb_setup_buffer.wValue));
usb_flags |= USB_FLAG_ADDRESS_PENDING;
/* The actual setting of the address is done when the status packet
is sent. */
usb_send_ctrl_status();
break;
#if SETABLE_STRING_DESCRIPTORS > 0
case SET_DESCRIPTOR:
if (usb_setup_buffer.wValue.byte.high == STRING) {
set_string_descriptor();
} else {
return 0;
}
break;
#endif
case SET_CONFIGURATION:
if (set_configuration()) {
#if 0
config_msg.data.config = LOW_BYTE(usb_setup_buffer.wValue);
notify_user(&config_msg);
#endif
}
break;
default:
return 0;
}
break;
case 0x01: /* standard interface OUT requests */
switch(usb_setup_buffer.bRequest) {
case SET_INTERFACE:
/* Change interface here if we support more than one */
usb_send_ctrl_status();
break;
default:
return 0;
}
break;
case 0x02: /* standard endpoint OUT requests */
switch(usb_setup_buffer.bRequest) {
case SET_FEATURE:
case CLEAR_FEATURE:
if (usb_setup_buffer.wValue == ENDPOINT_HALT_FEATURE) {
usb_arch_halt_endpoint(usb_setup_buffer.wIndex, usb_setup_buffer.bRequest== SET_FEATURE);
usb_send_ctrl_status();
} else {
usb_error_stall();
}
break;
default:
return 0;
}
break;
#ifdef HID_ENABLED
case 0xa1: /* class specific interface IN request*/
switch(USB_setup_buffer.bRequest) {
case GET_HID_REPORT:
PRINTF("Get report\n");
send_ctrl_response((code u_int8_t*)&zero_byte,
sizeof(zero_byte));
break;
case GET_HID_IDLE:
PRINTF("Get idle\n");
send_ctrl_response((code u_int8_t*)&zero_byte,
sizeof(zero_byte));
break;
default:
return 0;
}
break;
case 0x21: /* class specific interface OUT request*/
switch(USB_setup_buffer.bRequest) {
case SET_HID_IDLE:
PRINTF("Set idle\n");
send_ctrl_status();
break;
default:
return 0;
}
break;
#endif
default:
return 0;
}
return 1;
}
static const struct USBRequestHandler standard_request_handler =
{
0x00, 0x60,
0x00, 0x00,
handle_standard_requests
};
static struct USBRequestHandlerHook standard_request_hook =
{
NULL,
&standard_request_handler
};
static void
submit_setup(void)
{
ctrl_buffer.next = NULL;
ctrl_buffer.data = (uint8_t*)&usb_setup_buffer;
ctrl_buffer.left = sizeof(usb_setup_buffer);
ctrl_buffer.flags = (USB_BUFFER_PACKET_END | USB_BUFFER_SETUP
| USB_BUFFER_NOTIFY);
ctrl_buffer.id = SETUP_ID;
usb_submit_recv_buffer(0, &ctrl_buffer);
}
PROCESS(usb_process, "USB");
PROCESS_THREAD(usb_process, ev , data)
{
PROCESS_BEGIN();
PRINTF("USB process started\n");
while(1) {
PROCESS_WAIT_EVENT();
if (ev == PROCESS_EVENT_EXIT) break;
if (ev == PROCESS_EVENT_POLL) {
unsigned int events = usb_arch_get_global_events();
if (events) {
if (events & USB_EVENT_RESET) {
submit_setup();
usb_configuration_value = 0;
notify_user(USB_EVENT_RESET);
}
if (events & USB_EVENT_SUSPEND) {
notify_user(USB_EVENT_SUSPEND);
}
if (events & USB_EVENT_RESUME) {
notify_user(USB_EVENT_RESUME);
}
}
events = usb_get_ep_events(0);
if (events) {
if ((events & USB_EP_EVENT_NOTIFICATION)
&& !(ctrl_buffer.flags & USB_BUFFER_SUBMITTED)) {
/* PRINTF("Endpoint 0\n"); */
if (ctrl_buffer.flags & USB_BUFFER_FAILED) {
/* Something went wrong with the buffer, just wait for a
new SETUP packet */
PRINTF("Discarded\n");
submit_setup();
} else if (ctrl_buffer.flags & USB_BUFFER_SETUP) {
struct USBRequestHandlerHook *hook = usb_request_handler_hooks;
PRINTF("Setup\n");
{
unsigned int i;
for (i = 0; i< 8; i++) PRINTF(" %02x", ((unsigned char*)&usb_setup_buffer)[i]);
PRINTF("\n");
}
while(hook) {
const struct USBRequestHandler *handler = hook->handler;
/* Check if the handler matches the request */
if (((handler->request_type ^ usb_setup_buffer.bmRequestType)
& handler->request_type_mask) == 0
&& ((handler->request ^ usb_setup_buffer.bRequest)
& handler->request_mask) == 0) {
if (handler->handler_func()) break;
}
hook = hook->next;
}
if (!hook) {
/* No handler found */
usb_error_stall();
PRINTF("Unhandled setup: %02x %02x %04x %04x %04x\n",
usb_setup_buffer.bmRequestType, usb_setup_buffer.bRequest,
usb_setup_buffer.wValue, usb_setup_buffer.wIndex,
usb_setup_buffer.wLength);
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}
/* Check if any handler stalled the pipe, if so prepare for
next setup */
if (error_stall) {
error_stall = 0;
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submit_setup();
}
} else {
if (ctrl_buffer.id == IN_ID) {
/* Receive status stage */
PRINTF("Status OUT\n");
ctrl_buffer.flags = USB_BUFFER_NOTIFY;
ctrl_buffer.next = NULL;
ctrl_buffer.data = NULL;
ctrl_buffer.left = 0;
ctrl_buffer.id = STATUS_OUT_ID;
usb_submit_recv_buffer(0,&ctrl_buffer);
} else if (ctrl_buffer.id == STATUS_OUT_ID) {
PRINTF("Status OUT done\n");
submit_setup();
} else if (ctrl_buffer.id == STATUS_IN_ID) {
PRINTF("Status IN done\n");
if (usb_flags & USB_FLAG_ADDRESS_PENDING) {
while(usb_send_pending(0));
usb_arch_set_address(LOW_BYTE(usb_setup_buffer.wValue));
usb_flags &= ~USB_FLAG_ADDRESS_PENDING;
}
submit_setup();
} else if (ctrl_buffer.id == OUT_ID) {
PRINTF("OUT\n");
if (data_callback) {
data_callback(ctrl_data, ctrl_data_len- ctrl_buffer.left);
} else {
usb_send_ctrl_status();
}
}
}
}
}
}
}
PROCESS_END();
}
void
usb_setup(void)
{
usb_arch_setup();
process_start(&usb_process, NULL);
usb_arch_set_global_event_process(&usb_process);
usb_set_ep_event_process(0, &usb_process);
usb_register_request_handler(&standard_request_hook);
}
void
usb_register_request_handler(struct USBRequestHandlerHook *hook)
{
struct USBRequestHandlerHook **prevp = &usb_request_handler_hooks;
/* Find last hook */
while(*prevp) {
prevp = &(*prevp)->next;
}
/* Add last */
*prevp = hook;
hook->next = NULL;
}
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void
usb_prepend_request_handler(struct USBRequestHandlerHook *hook)
{
hook->next = usb_request_handler_hooks;
usb_request_handler_hooks = hook;
}
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unsigned int
usb_get_current_configuration(void)
{
return usb_configuration_value;
}
void
usb_setup_bulk_endpoint(unsigned char addr)
{
usb_arch_setup_bulk_endpoint(addr);
}
void
usb_setup_interrupt_endpoint(unsigned char addr)
{
usb_arch_setup_interrupt_endpoint(addr);
}
void
usb_disable_endpoint(uint8_t addr)
{
usb_arch_discard_all_buffers(addr);
usb_arch_disable_endpoint(addr);
}
void
usb_discard_all_buffers(uint8_t addr)
{
usb_arch_discard_all_buffers(addr);
}
void
usb_halt_endpoint(uint8_t addr, int halt)
{
usb_arch_halt_endpoint(addr, halt);
}
int
usb_send_pending(uint8_t addr)
{
return usb_arch_send_pending(addr);
}