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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2000,2001,2002,2003,2004,2005,2007,2008,2009,2010 Free Software Foundation, Inc.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/serial.h>
#include <grub/types.h>
#include <grub/dl.h>
#include <grub/misc.h>
#include <grub/mm.h>
#include <grub/usb.h>
#include <grub/usbserial.h>
#include <grub/i18n.h>
GRUB_MOD_LICENSE ("GPLv3+");
/* Convert speed to divisor. */
static grub_uint32_t
is_speed_supported (unsigned int speed)
{
unsigned int i;
unsigned int supported[] = { 2400, 4800, 9600, 19200, 38400, 57600, 115200};
for (i = 0; i < ARRAY_SIZE (supported); i++)
if (supported[i] == speed)
return 1;
return 0;
}
#define GRUB_PL2303_REQUEST_SET_CONFIG 0x20
#define GRUB_PL2303_STOP_BITS_1 0x0
#define GRUB_PL2303_STOP_BITS_1_5 0x1
#define GRUB_PL2303_STOP_BITS_2 0x2
#define GRUB_PL2303_PARITY_NONE 0
#define GRUB_PL2303_PARITY_ODD 1
#define GRUB_PL2303_PARITY_EVEN 2
struct grub_pl2303_config
{
grub_uint32_t speed;
grub_uint8_t stop_bits;
grub_uint8_t parity;
grub_uint8_t word_len;
} GRUB_PACKED;
static void
real_config (struct grub_serial_port *port)
{
struct grub_pl2303_config config_pl2303;
char xx;
if (port->configured)
return;
grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_IN,
1, 0x8484, 0, 1, &xx);
grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
1, 0x0404, 0, 0, 0);
grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_IN,
1, 0x8484, 0, 1, &xx);
grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_IN,
1, 0x8383, 0, 1, &xx);
grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_IN,
1, 0x8484, 0, 1, &xx);
grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
1, 0x0404, 1, 0, 0);
grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_IN,
1, 0x8484, 0, 1, &xx);
grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_IN,
1, 0x8383, 0, 1, &xx);
grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
1, 0, 1, 0, 0);
grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
1, 1, 0, 0, 0);
grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
1, 2, 0x44, 0, 0);
grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
1, 8, 0, 0, 0);
grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
1, 9, 0, 0, 0);
if (port->config.stop_bits == GRUB_SERIAL_STOP_BITS_2)
config_pl2303.stop_bits = GRUB_PL2303_STOP_BITS_2;
else if (port->config.stop_bits == GRUB_SERIAL_STOP_BITS_1_5)
config_pl2303.stop_bits = GRUB_PL2303_STOP_BITS_1_5;
else
config_pl2303.stop_bits = GRUB_PL2303_STOP_BITS_1;
switch (port->config.parity)
{
case GRUB_SERIAL_PARITY_NONE:
config_pl2303.parity = GRUB_PL2303_PARITY_NONE;
break;
case GRUB_SERIAL_PARITY_ODD:
config_pl2303.parity = GRUB_PL2303_PARITY_ODD;
break;
case GRUB_SERIAL_PARITY_EVEN:
config_pl2303.parity = GRUB_PL2303_PARITY_EVEN;
break;
}
config_pl2303.word_len = port->config.word_len;
config_pl2303.speed = port->config.speed;
grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_CLASS_INTERFACE_OUT,
GRUB_PL2303_REQUEST_SET_CONFIG, 0, 0,
sizeof (config_pl2303), (char *) &config_pl2303);
grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_CLASS_INTERFACE_OUT,
0x22, 3, 0, 0, 0);
grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
1, 0, port->config.rtscts ? 0x61 : 0, 0, 0);
port->configured = 1;
}
/* Fetch a key. */
static int
pl2303_hw_fetch (struct grub_serial_port *port)
{
real_config (port);
return grub_usbserial_fetch (port, 0);
}
/* Put a character. */
static void
pl2303_hw_put (struct grub_serial_port *port, const int c)
{
char cc = c;
real_config (port);
grub_usb_bulk_write (port->usbdev, port->out_endp, 1, &cc);
}
static grub_err_t
pl2303_hw_configure (struct grub_serial_port *port,
struct grub_serial_config *config)
{
if (!is_speed_supported (config->speed))
return grub_error (GRUB_ERR_BAD_ARGUMENT,
N_("unsupported serial port speed"));
if (config->parity != GRUB_SERIAL_PARITY_NONE
&& config->parity != GRUB_SERIAL_PARITY_ODD
&& config->parity != GRUB_SERIAL_PARITY_EVEN)
return grub_error (GRUB_ERR_BAD_ARGUMENT,
N_("unsupported serial port parity"));
if (config->stop_bits != GRUB_SERIAL_STOP_BITS_1
&& config->stop_bits != GRUB_SERIAL_STOP_BITS_1_5
&& config->stop_bits != GRUB_SERIAL_STOP_BITS_2)
return grub_error (GRUB_ERR_BAD_ARGUMENT,
N_("unsupported serial port stop bits number"));
if (config->word_len < 5 || config->word_len > 8)
return grub_error (GRUB_ERR_BAD_ARGUMENT,
N_("unsupported serial port word length"));
port->config = *config;
port->configured = 0;
return GRUB_ERR_NONE;
}
static struct grub_serial_driver grub_pl2303_driver =
{
.configure = pl2303_hw_configure,
.fetch = pl2303_hw_fetch,
.put = pl2303_hw_put,
.fini = grub_usbserial_fini
};
static const struct
{
grub_uint16_t vendor, product;
} products[] =
{
{0x067b, 0x2303}
};
static int
grub_pl2303_attach (grub_usb_device_t usbdev, int configno, int interfno)
{
unsigned j;
for (j = 0; j < ARRAY_SIZE (products); j++)
if (usbdev->descdev.vendorid == products[j].vendor
&& usbdev->descdev.prodid == products[j].product)
break;
if (j == ARRAY_SIZE (products))
return 0;
return grub_usbserial_attach (usbdev, configno, interfno,
&grub_pl2303_driver,
GRUB_USB_SERIAL_ENDPOINT_LAST_MATCHING,
GRUB_USB_SERIAL_ENDPOINT_LAST_MATCHING);
}
static struct grub_usb_attach_desc attach_hook =
{
.class = 0xff,
.hook = grub_pl2303_attach
};
GRUB_MOD_INIT(usbserial_pl2303)
{
grub_usb_register_attach_hook_class (&attach_hook);
}
GRUB_MOD_FINI(usbserial_pl2303)
{
grub_serial_unregister_driver (&grub_pl2303_driver);
grub_usb_unregister_attach_hook_class (&attach_hook);
}
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