usbtty.c

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/*
 * (C) Copyright 2003
 * Gerry Hamel, [e-mail], Texas Instruments
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307	 USA
 *
 */

#include <common.h>

#ifdef CONFIG_USB_TTY

#include <circbuf.h>
#include <devices.h>
#include "usbtty.h"

#if 0
#define TTYDBG(fmt,args...) serial_printf("[%s] %s %d: "fmt, __FILE__,__FUNCTION__,__LINE__,##args)
#else
#define TTYDBG(fmt,args...) do{}while(0)
#endif

#if 0
#define TTYERR(fmt,args...) serial_printf("ERROR![%s] %s %d: "fmt, __FILE__,__FUNCTION__,__LINE__,##args)
#else
#define TTYERR(fmt,args...) do{}while(0)
#endif

/*
 * Buffers to hold input and output data
 */
#define USBTTY_BUFFER_SIZE 256
static circbuf_t usbtty_input;
static circbuf_t usbtty_output;


/*
 * Instance variables
 */
static device_t usbttydev;
static struct usb_device_instance	 device_instance[1];
static struct usb_bus_instance		 bus_instance[1];
static struct usb_configuration_instance config_instance[NUM_CONFIGS];
static struct usb_interface_instance	 interface_instance[NUM_INTERFACES];
static struct usb_alternate_instance	 alternate_instance[NUM_INTERFACES];
static struct usb_endpoint_instance	 endpoint_instance[NUM_ENDPOINTS+1]; /* one extra for control endpoint */

/*
 * Static allocation of urbs
 */
#define RECV_ENDPOINT 1
#define TX_ENDPOINT 2

/*
 * Global flag
 */
int usbtty_configured_flag = 0;


/*
 * Serial number
 */
static char serial_number[16];

/*
 * Descriptors
 */
static u8 wstrLang[4] = {4,USB_DT_STRING,0x9,0x4};
static u8 wstrManufacturer[2 + 2*(sizeof(CONFIG_USBD_MANUFACTURER)-1)];
static u8 wstrProduct[2 + 2*(sizeof(CONFIG_USBD_PRODUCT_NAME)-1)];
static u8 wstrSerial[2 + 2*(sizeof(serial_number) - 1)];
static u8 wstrConfiguration[2 + 2*(sizeof(CONFIG_USBD_CONFIGURATION_STR)-1)];
static u8 wstrInterface[2 + 2*(sizeof(CONFIG_USBD_INTERFACE_STR)-1)];

static struct usb_string_descriptor *usbtty_string_table[] = {
  (struct usb_string_descriptor*)wstrLang,
  (struct usb_string_descriptor*)wstrManufacturer,
  (struct usb_string_descriptor*)wstrProduct,
  (struct usb_string_descriptor*)wstrSerial,
  (struct usb_string_descriptor*)wstrConfiguration,
  (struct usb_string_descriptor*)wstrInterface
};
extern struct usb_string_descriptor **usb_strings; /* defined and used by omap1510_ep0.c */

static struct usb_device_descriptor device_descriptor = {
  bLength:	      sizeof(struct usb_device_descriptor),
  bDescriptorType:    USB_DT_DEVICE,
  bcdUSB:	      USB_BCD_VERSION,
  bDeviceClass:	      USBTTY_DEVICE_CLASS,
  bDeviceSubClass:    USBTTY_DEVICE_SUBCLASS,
  bDeviceProtocol:    USBTTY_DEVICE_PROTOCOL,
  bMaxPacketSize0:    EP0_MAX_PACKET_SIZE,
  idVendor:	      CONFIG_USBD_VENDORID,
  idProduct:	      CONFIG_USBD_PRODUCTID,
  bcdDevice:	      USBTTY_BCD_DEVICE,
  iManufacturer:      STR_MANUFACTURER,
  iProduct:	      STR_PRODUCT,
  iSerialNumber:      STR_SERIAL,
  bNumConfigurations: NUM_CONFIGS
  };
static struct usb_configuration_descriptor config_descriptors[NUM_CONFIGS] = {
  {
    bLength:		 sizeof(struct usb_configuration_descriptor),
    bDescriptorType:	 USB_DT_CONFIG,
    wTotalLength:	 (sizeof(struct usb_configuration_descriptor)*NUM_CONFIGS) +
			 (sizeof(struct usb_interface_descriptor)*NUM_INTERFACES) +
			 (sizeof(struct usb_endpoint_descriptor)*NUM_ENDPOINTS),
    bNumInterfaces:	 NUM_INTERFACES,
    bConfigurationValue: 1,
    iConfiguration:	 STR_CONFIG,
    bmAttributes:	 BMATTRIBUTE_SELF_POWERED | BMATTRIBUTE_RESERVED,
    bMaxPower:		 USBTTY_MAXPOWER
  },
};
static struct usb_interface_descriptor interface_descriptors[NUM_INTERFACES] = {
  {
    bLength:		 sizeof(struct usb_interface_descriptor),
    bDescriptorType:	 USB_DT_INTERFACE,
    bInterfaceNumber:	 0,
    bAlternateSetting:	 0,
    bNumEndpoints:	 NUM_ENDPOINTS,
    bInterfaceClass:	 USBTTY_INTERFACE_CLASS,
    bInterfaceSubClass:	 USBTTY_INTERFACE_SUBCLASS,
    bInterfaceProtocol:	 USBTTY_INTERFACE_PROTOCOL,
    iInterface:		 STR_INTERFACE
  },
};
static struct usb_endpoint_descriptor ep_descriptors[NUM_ENDPOINTS] = {
  {
    bLength:		 sizeof(struct usb_endpoint_descriptor),
    bDescriptorType:	 USB_DT_ENDPOINT,
    bEndpointAddress:	 CONFIG_USBD_SERIAL_OUT_ENDPOINT | USB_DIR_OUT,
    bmAttributes:	 USB_ENDPOINT_XFER_BULK,
    wMaxPacketSize:	 CONFIG_USBD_SERIAL_OUT_PKTSIZE,
    bInterval:		 0
  },
  {
    bLength:		 sizeof(struct usb_endpoint_descriptor),
    bDescriptorType:	 USB_DT_ENDPOINT,
    bEndpointAddress:	 CONFIG_USBD_SERIAL_IN_ENDPOINT | USB_DIR_IN,
    bmAttributes:	 USB_ENDPOINT_XFER_BULK,
    wMaxPacketSize:	 CONFIG_USBD_SERIAL_IN_PKTSIZE,
    bInterval:		 0
  },
  {
    bLength:		 sizeof(struct usb_endpoint_descriptor),
    bDescriptorType:	 USB_DT_ENDPOINT,
    bEndpointAddress:	 CONFIG_USBD_SERIAL_INT_ENDPOINT | USB_DIR_IN,
    bmAttributes:	 USB_ENDPOINT_XFER_INT,
    wMaxPacketSize:	 CONFIG_USBD_SERIAL_INT_PKTSIZE,
    bInterval:		 0
  },
};
static struct usb_endpoint_descriptor *ep_descriptor_ptrs[NUM_ENDPOINTS] = {
  &(ep_descriptors[0]),
  &(ep_descriptors[1]),
  &(ep_descriptors[2]),
};

/* utility function for converting char* to wide string used by USB */
static void str2wide (char *str, u16 * wide)
{
	int i;

	for (i = 0; i < strlen (str) && str[i]; i++)
		wide[i] = (u16) str[i];
}

/*
 * Prototypes
 */
static void usbtty_init_strings (void);
static void usbtty_init_instances (void);
static void usbtty_init_endpoints (void);

static void usbtty_event_handler (struct usb_device_instance *device,
				  usb_device_event_t event, int data);
static int usbtty_configured (void);

static int write_buffer (circbuf_t * buf);
static int fill_buffer (circbuf_t * buf);

void usbtty_poll (void);
static void pretend_interrupts (void);


/*
 * Test whether a character is in the RX buffer
 */
int usbtty_tstc (void)
{
	usbtty_poll ();
	return (usbtty_input.size > 0);
}

/*
 * Read a single byte from the usb client port. Returns 1 on success, 0
 * otherwise. When the function is succesfull, the character read is
 * written into its argument c.
 */
int usbtty_getc (void)
{
	char c;

	while (usbtty_input.size <= 0) {
		usbtty_poll ();
	}

	buf_pop (&usbtty_input, &c, 1);
	return c;
}

/*
 * Output a single byte to the usb client port.
 */
void usbtty_putc (const char c)
{
	buf_push (&usbtty_output, &c, 1);
	/* If \n, also do \r */
	if (c == '\n')
		buf_push (&usbtty_output, "\r", 1);

	/* Poll at end to handle new data... */
	if ((usbtty_output.size + 2) >= usbtty_output.totalsize) {
		usbtty_poll ();
	}
}


/* usbtty_puts() helper function for finding the next '\n' in a string */
static int next_nl_pos (const char *s)
{
	int i;

	for (i = 0; s[i] != '\0'; i++) {
		if (s[i] == '\n')
			return i;
	}
	return i;
}

/*
 * Output a string to the usb client port.
 */
static void __usbtty_puts (const char *str, int len)
{
	int maxlen = usbtty_output.totalsize;
	int space, n;

	/* break str into chunks < buffer size, if needed */
	while (len > 0) {
		space = maxlen - usbtty_output.size;

		/* Empty buffer here, if needed, to ensure space... */
		if (space <= 0) {
			write_buffer (&usbtty_output);
			space = maxlen - usbtty_output.size;
			if (space <= 0) {
				space = len;	/* allow old data to be overwritten. */
			}
		}

		n = MIN (space, MIN (len, maxlen));
		buf_push (&usbtty_output, str, n);

		str += n;
		len -= n;
	}
}

void usbtty_puts (const char *str)
{
	int n;
	int len = strlen (str);

	/* add '\r' for each '\n' */
	while (len > 0) {
		n = next_nl_pos (str);

		if (str[n] == '\n') {
			__usbtty_puts (str, n + 1);
			__usbtty_puts ("\r", 1);
			str += (n + 1);
			len -= (n + 1);
		} else {
			/* No \n found.	 All done. */
			__usbtty_puts (str, n);
			break;
		}
	}

	/* Poll at end to handle new data... */
	usbtty_poll ();
}

/*
 * Initialize the usb client port.
 *
 */
int drv_usbtty_init (void)
{
	int rc;
	char * sn;
	int snlen;

	if (!(sn = getenv("serial#"))) {
		sn = "000000000000";
	}
	snlen = strlen(sn);
	if (snlen > sizeof(serial_number) - 1) {
		printf ("Warning: serial number %s is too long (%d > %d)\n",
			sn, snlen, sizeof(serial_number) - 1);
		snlen = sizeof(serial_number) - 1;
	}
	memcpy (serial_number, sn, snlen);
	serial_number[snlen] = '\0';

	/* prepare buffers... */
	buf_init (&usbtty_input, USBTTY_BUFFER_SIZE);
	buf_init (&usbtty_output, USBTTY_BUFFER_SIZE);