drivers/serial/sandbox.c

   1 /*
   2  * Copyright (c) 2011 The Chromium OS Authors.
   3  * See file CREDITS for list of people who contributed to this
   4  * project.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation; either version 2 of
   9  * the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  19  * MA 02111-1307 USA
  20  */
  21
  22 /*
  23  * This provide a test serial port. It provides an emulated serial port where
  24  * a test program and read out the serial output and inject serial input for
  25  * U-Boot.
  26  */
  27
  28 #include <common.h>
  29 #include <os.h>
  30 #include <serial.h>
  31 #include <linux/compiler.h>
  32
  33 static int sandbox_serial_init(void)
  34 {
  35         os_tty_raw(0);
  36         return 0;
  37 }
  38
  39 static void sandbox_serial_setbrg(void)
  40 {
  41 }
  42
  43 static void sandbox_serial_putc(const char ch)
  44 {
  45         os_write(1, &ch, 1);
  46 }
  47
  48 static void sandbox_serial_puts(const char *str)
  49 {
  50         os_write(1, str, strlen(str));
  51 }
  52
  53 static int sandbox_serial_getc(void)
  54 {
  55         char buf;
  56         ssize_t count;
  57
  58         count = os_read(0, &buf, 1);
  59         return count == 1 ? buf : 0;
  60 }
  61
  62 static int sandbox_serial_tstc(void)
  63 {
  64         return 0;
  65 }
  66
  67 static struct serial_device sandbox_serial_drv = {
  68         .name   = "sandbox_serial",
  69         .start  = sandbox_serial_init,
  70         .stop   = NULL,
  71         .setbrg = sandbox_serial_setbrg,
  72         .putc   = sandbox_serial_putc,
  73         .puts   = sandbox_serial_puts,
  74         .getc   = sandbox_serial_getc,
  75         .tstc   = sandbox_serial_tstc,
  76 };
  77
  78 void sandbox_serial_initialize(void)
  79 {
  80         serial_register(&sandbox_serial_drv);
  81 }
  82
  83 __weak struct serial_device *default_serial_console(void)
  84 {
  85         return &sandbox_serial_drv;
  86 }