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Rev | Author | Line No. | Line |
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846 | giacomo | 1 | /* |
2 | * USB Serial Console driver |
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3 | * |
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4 | * Copyright (C) 2001 - 2002 Greg Kroah-Hartman (greg@kroah.com) |
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5 | * |
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6 | * This program is free software; you can redistribute it and/or |
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7 | * modify it under the terms of the GNU General Public License version |
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8 | * 2 as published by the Free Software Foundation. |
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9 | * |
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10 | * Thanks to Randy Dunlap for the original version of this code. |
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11 | * |
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12 | */ |
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13 | |||
14 | #include <linuxcomp.h> |
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15 | |||
16 | #include <linux/config.h> |
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17 | #include <linux/kernel.h> |
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18 | #include <linux/init.h> |
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19 | #include <linux/slab.h> |
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20 | #include <linux/tty.h> |
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21 | #include <linux/console.h> |
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22 | #include <linux/usb.h> |
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23 | |||
24 | static int debug; |
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25 | |||
26 | #include "usb-serial.h" |
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27 | |||
28 | struct usbcons_info { |
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29 | int magic; |
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30 | int break_flag; |
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31 | struct usb_serial_port *port; |
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32 | }; |
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33 | |||
34 | static struct usbcons_info usbcons_info; |
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35 | static struct console usbcons; |
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36 | |||
37 | /* |
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38 | * ------------------------------------------------------------ |
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39 | * USB Serial console driver |
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40 | * |
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41 | * Much of the code here is copied from drivers/char/serial.c |
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42 | * and implements a phony serial console in the same way that |
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43 | * serial.c does so that in case some software queries it, |
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44 | * it will get the same results. |
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45 | * |
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46 | * Things that are different from the way the serial port code |
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47 | * does things, is that we call the lower level usb-serial |
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48 | * driver code to initialize the device, and we set the initial |
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49 | * console speeds based on the command line arguments. |
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50 | * ------------------------------------------------------------ |
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51 | */ |
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52 | |||
53 | |||
54 | /* |
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55 | * The parsing of the command line works exactly like the |
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56 | * serial.c code, except that the specifier is "ttyUSB" instead |
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57 | * of "ttyS". |
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58 | */ |
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59 | static int __init usb_console_setup(struct console *co, char *options) |
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60 | { |
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61 | struct usbcons_info *info = &usbcons_info; |
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62 | int baud = 9600; |
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63 | int bits = 8; |
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64 | int parity = 'n'; |
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65 | int doflow = 0; |
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66 | int cflag = CREAD | HUPCL | CLOCAL; |
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67 | char *s; |
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68 | struct usb_serial *serial; |
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69 | struct usb_serial_port *port; |
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70 | int retval = 0; |
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71 | struct tty_struct *tty; |
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72 | struct termios *termios; |
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73 | |||
74 | dbg ("%s", __FUNCTION__); |
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75 | |||
76 | if (options) { |
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77 | baud = simple_strtoul(options, NULL, 10); |
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78 | s = options; |
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79 | while (*s >= '0' && *s <= '9') |
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80 | s++; |
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81 | if (*s) |
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82 | parity = *s++; |
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83 | if (*s) |
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84 | bits = *s++ - '0'; |
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85 | if (*s) |
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86 | doflow = (*s++ == 'r'); |
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87 | } |
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88 | |||
89 | /* build a cflag setting */ |
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90 | switch (baud) { |
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91 | case 1200: |
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92 | cflag |= B1200; |
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93 | break; |
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94 | case 2400: |
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95 | cflag |= B2400; |
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96 | break; |
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97 | case 4800: |
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98 | cflag |= B4800; |
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99 | break; |
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100 | case 19200: |
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101 | cflag |= B19200; |
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102 | break; |
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103 | case 38400: |
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104 | cflag |= B38400; |
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105 | break; |
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106 | case 57600: |
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107 | cflag |= B57600; |
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108 | break; |
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109 | case 115200: |
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110 | cflag |= B115200; |
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111 | break; |
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112 | case 9600: |
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113 | default: |
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114 | cflag |= B9600; |
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115 | /* |
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116 | * Set this to a sane value to prevent a divide error |
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117 | */ |
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118 | baud = 9600; |
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119 | break; |
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120 | } |
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121 | switch (bits) { |
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122 | case 7: |
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123 | cflag |= CS7; |
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124 | break; |
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125 | default: |
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126 | case 8: |
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127 | cflag |= CS8; |
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128 | break; |
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129 | } |
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130 | switch (parity) { |
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131 | case 'o': case 'O': |
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132 | cflag |= PARODD; |
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133 | break; |
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134 | case 'e': case 'E': |
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135 | cflag |= PARENB; |
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136 | break; |
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137 | } |
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138 | co->cflag = cflag; |
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139 | |||
140 | /* grab the first serial port that happens to be connected */ |
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141 | serial = usb_serial_get_by_index(0); |
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142 | if (serial_paranoia_check (serial, __FUNCTION__)) { |
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143 | /* no device is connected yet, sorry :( */ |
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144 | err ("No USB device connected to ttyUSB0"); |
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145 | return -ENODEV; |
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146 | } |
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147 | |||
148 | port = serial->port[0]; |
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149 | port->tty = NULL; |
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150 | |||
151 | info->port = port; |
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152 | |||
153 | ++port->open_count; |
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154 | if (port->open_count == 1) { |
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155 | /* only call the device specific open if this |
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156 | * is the first time the port is opened */ |
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157 | if (serial->type->open) |
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158 | retval = serial->type->open(port, NULL); |
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159 | else |
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160 | retval = usb_serial_generic_open(port, NULL); |
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161 | if (retval) |
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162 | port->open_count = 0; |
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163 | } |
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164 | |||
165 | if (retval) { |
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166 | err ("could not open USB console port"); |
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167 | return retval; |
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168 | } |
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169 | |||
170 | if (serial->type->set_termios) { |
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171 | /* build up a fake tty structure so that the open call has something |
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172 | * to look at to get the cflag value */ |
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173 | tty = kmalloc (sizeof (*tty), GFP_KERNEL); |
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174 | if (!tty) { |
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175 | err ("no more memory"); |
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176 | return -ENOMEM; |
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177 | } |
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178 | termios = kmalloc (sizeof (*termios), GFP_KERNEL); |
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179 | if (!termios) { |
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180 | err ("no more memory"); |
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181 | kfree (tty); |
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182 | return -ENOMEM; |
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183 | } |
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184 | memset (tty, 0x00, sizeof(*tty)); |
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185 | memset (termios, 0x00, sizeof(*termios)); |
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186 | termios->c_cflag = cflag; |
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187 | tty->termios = termios; |
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188 | port->tty = tty; |
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189 | |||
190 | /* set up the initial termios settings */ |
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191 | serial->type->set_termios(port, NULL); |
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192 | port->tty = NULL; |
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193 | kfree (termios); |
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194 | kfree (tty); |
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195 | } |
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196 | |||
197 | return retval; |
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198 | } |
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199 | |||
200 | static void usb_console_write(struct console *co, const char *buf, unsigned count) |
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201 | { |
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202 | static struct usbcons_info *info = &usbcons_info; |
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203 | struct usb_serial_port *port = info->port; |
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204 | struct usb_serial *serial = get_usb_serial (port, __FUNCTION__); |
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205 | int retval = -ENODEV; |
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206 | |||
207 | if (!serial || !port) |
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208 | return; |
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209 | |||
210 | if (count == 0) |
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211 | return; |
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212 | |||
213 | dbg("%s - port %d, %d byte(s)", __FUNCTION__, port->number, count); |
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214 | |||
215 | if (!port->open_count) { |
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216 | dbg ("%s - port not opened", __FUNCTION__); |
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217 | goto exit; |
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218 | } |
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219 | |||
220 | /* pass on to the driver specific version of this function if it is available */ |
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221 | if (serial->type->write) |
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222 | retval = serial->type->write(port, 0, buf, count); |
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223 | else |
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224 | retval = usb_serial_generic_write(port, 0, buf, count); |
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225 | |||
226 | exit: |
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227 | dbg("%s - return value (if we had one): %d", __FUNCTION__, retval); |
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228 | } |
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229 | |||
230 | static struct console usbcons = { |
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231 | .name = "ttyUSB", |
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232 | .write = usb_console_write, |
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233 | .setup = usb_console_setup, |
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234 | .flags = CON_PRINTBUFFER, |
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235 | .index = -1, |
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236 | }; |
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237 | |||
238 | void usb_serial_console_init (int serial_debug, int minor) |
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239 | { |
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240 | debug = serial_debug; |
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241 | |||
242 | if (minor == 0) { |
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243 | /* |
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244 | * Call register_console() if this is the first device plugged |
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245 | * in. If we call it earlier, then the callback to |
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246 | * console_setup() will fail, as there is not a device seen by |
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247 | * the USB subsystem yet. |
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248 | */ |
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249 | /* |
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250 | * Register console. |
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251 | * NOTES: |
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252 | * console_setup() is called (back) immediately (from register_console). |
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253 | * console_write() is called immediately from register_console iff |
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254 | * CON_PRINTBUFFER is set in flags. |
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255 | */ |
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256 | dbg ("registering the USB serial console."); |
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257 | register_console(&usbcons); |
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258 | } |
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259 | } |
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260 | |||
261 | void usb_serial_console_exit (void) |
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262 | { |
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263 | unregister_console(&usbcons); |
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264 | } |
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265 |