231 lines
6.5 KiB
C
231 lines
6.5 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2000,2001,2002,2003,2004,2005,2007,2008,2009,2010 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/serial.h>
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#include <grub/types.h>
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#include <grub/dl.h>
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#include <grub/misc.h>
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#include <grub/mm.h>
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#include <grub/usb.h>
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#include <grub/usbserial.h>
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#include <grub/i18n.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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/* Convert speed to divisor. */
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static grub_uint32_t
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is_speed_supported (unsigned int speed)
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{
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unsigned int i;
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unsigned int supported[] = { 2400, 4800, 9600, 19200, 38400, 57600, 115200};
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for (i = 0; i < ARRAY_SIZE (supported); i++)
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if (supported[i] == speed)
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return 1;
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return 0;
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}
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#define GRUB_PL2303_REQUEST_SET_CONFIG 0x20
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#define GRUB_PL2303_STOP_BITS_1 0x0
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#define GRUB_PL2303_STOP_BITS_1_5 0x1
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#define GRUB_PL2303_STOP_BITS_2 0x2
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#define GRUB_PL2303_PARITY_NONE 0
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#define GRUB_PL2303_PARITY_ODD 1
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#define GRUB_PL2303_PARITY_EVEN 2
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struct grub_pl2303_config
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{
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grub_uint32_t speed;
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grub_uint8_t stop_bits;
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grub_uint8_t parity;
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grub_uint8_t word_len;
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} __attribute__ ((packed));
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static void
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real_config (struct grub_serial_port *port)
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{
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struct grub_pl2303_config config_pl2303;
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char xx;
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if (port->configured)
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return;
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grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_IN,
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1, 0x8484, 0, 1, &xx);
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grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
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1, 0x0404, 0, 0, 0);
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grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_IN,
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1, 0x8484, 0, 1, &xx);
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grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_IN,
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1, 0x8383, 0, 1, &xx);
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grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_IN,
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1, 0x8484, 0, 1, &xx);
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grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
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1, 0x0404, 1, 0, 0);
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grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_IN,
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1, 0x8484, 0, 1, &xx);
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grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_IN,
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1, 0x8383, 0, 1, &xx);
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grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
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1, 0, 1, 0, 0);
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grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
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1, 1, 0, 0, 0);
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grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
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1, 2, 0x44, 0, 0);
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grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
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1, 8, 0, 0, 0);
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grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
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1, 9, 0, 0, 0);
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if (port->config.stop_bits == GRUB_SERIAL_STOP_BITS_2)
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config_pl2303.stop_bits = GRUB_PL2303_STOP_BITS_2;
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else if (port->config.stop_bits == GRUB_SERIAL_STOP_BITS_1_5)
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config_pl2303.stop_bits = GRUB_PL2303_STOP_BITS_1_5;
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else
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config_pl2303.stop_bits = GRUB_PL2303_STOP_BITS_1;
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switch (port->config.parity)
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{
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case GRUB_SERIAL_PARITY_NONE:
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config_pl2303.parity = GRUB_PL2303_PARITY_NONE;
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break;
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case GRUB_SERIAL_PARITY_ODD:
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config_pl2303.parity = GRUB_PL2303_PARITY_ODD;
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break;
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case GRUB_SERIAL_PARITY_EVEN:
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config_pl2303.parity = GRUB_PL2303_PARITY_EVEN;
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break;
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}
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config_pl2303.word_len = port->config.word_len;
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config_pl2303.speed = port->config.speed;
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grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_CLASS_INTERFACE_OUT,
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GRUB_PL2303_REQUEST_SET_CONFIG, 0, 0,
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sizeof (config_pl2303), (char *) &config_pl2303);
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grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_CLASS_INTERFACE_OUT,
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0x22, 3, 0, 0, 0);
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grub_usb_control_msg (port->usbdev, GRUB_USB_REQTYPE_VENDOR_OUT,
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1, 0, port->config.rtscts ? 0x61 : 0, 0, 0);
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port->configured = 1;
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}
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/* Fetch a key. */
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static int
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pl2303_hw_fetch (struct grub_serial_port *port)
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{
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real_config (port);
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return grub_usbserial_fetch (port, 0);
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}
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/* Put a character. */
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static void
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pl2303_hw_put (struct grub_serial_port *port, const int c)
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{
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char cc = c;
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real_config (port);
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grub_usb_bulk_write (port->usbdev, port->out_endp, 1, &cc);
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}
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static grub_err_t
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pl2303_hw_configure (struct grub_serial_port *port,
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struct grub_serial_config *config)
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{
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if (!is_speed_supported (config->speed))
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return grub_error (GRUB_ERR_BAD_ARGUMENT,
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N_("unsupported serial port speed"));
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if (config->parity != GRUB_SERIAL_PARITY_NONE
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&& config->parity != GRUB_SERIAL_PARITY_ODD
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&& config->parity != GRUB_SERIAL_PARITY_EVEN)
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return grub_error (GRUB_ERR_BAD_ARGUMENT,
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N_("unsupported serial port parity"));
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if (config->stop_bits != GRUB_SERIAL_STOP_BITS_1
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&& config->stop_bits != GRUB_SERIAL_STOP_BITS_1_5
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&& config->stop_bits != GRUB_SERIAL_STOP_BITS_2)
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return grub_error (GRUB_ERR_BAD_ARGUMENT,
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N_("unsupported serial port stop bits number"));
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if (config->word_len < 5 || config->word_len > 8)
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return grub_error (GRUB_ERR_BAD_ARGUMENT,
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N_("unsupported serial port word length"));
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port->config = *config;
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port->configured = 0;
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return GRUB_ERR_NONE;
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}
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static struct grub_serial_driver grub_pl2303_driver =
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{
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.configure = pl2303_hw_configure,
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.fetch = pl2303_hw_fetch,
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.put = pl2303_hw_put,
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.fini = grub_usbserial_fini
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};
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static const struct
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{
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grub_uint16_t vendor, product;
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} products[] =
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{
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{0x067b, 0x2303}
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};
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static int
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grub_pl2303_attach (grub_usb_device_t usbdev, int configno, int interfno)
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{
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unsigned j;
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for (j = 0; j < ARRAY_SIZE (products); j++)
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if (usbdev->descdev.vendorid == products[j].vendor
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&& usbdev->descdev.prodid == products[j].product)
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break;
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if (j == ARRAY_SIZE (products))
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return 0;
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return grub_usbserial_attach (usbdev, configno, interfno,
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&grub_pl2303_driver,
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GRUB_USB_SERIAL_ENDPOINT_LAST_MATCHING,
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GRUB_USB_SERIAL_ENDPOINT_LAST_MATCHING);
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}
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static struct grub_usb_attach_desc attach_hook =
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{
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.class = 0xff,
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.hook = grub_pl2303_attach
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};
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GRUB_MOD_INIT(usbserial_pl2303)
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{
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grub_usb_register_attach_hook_class (&attach_hook);
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}
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GRUB_MOD_FINI(usbserial_pl2303)
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{
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grub_serial_unregister_driver (&grub_pl2303_driver);
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grub_usb_unregister_attach_hook_class (&attach_hook);
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}
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