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1da177e4 LT |
1 | /* |
2 | * USB Serial Console driver | |
3 | * | |
4 | * Copyright (C) 2001 - 2002 Greg Kroah-Hartman (greg@kroah.com) | |
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 version | |
8 | * 2 as published by the Free Software Foundation. | |
9 | * | |
10 | * Thanks to Randy Dunlap for the original version of this code. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/config.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/tty.h> | |
19 | #include <linux/console.h> | |
20 | #include <linux/usb.h> | |
21 | ||
22 | static int debug; | |
23 | ||
24 | #include "usb-serial.h" | |
25 | ||
26 | struct usbcons_info { | |
27 | int magic; | |
28 | int break_flag; | |
29 | struct usb_serial_port *port; | |
30 | }; | |
31 | ||
32 | static struct usbcons_info usbcons_info; | |
33 | static struct console usbcons; | |
34 | ||
35 | /* | |
36 | * ------------------------------------------------------------ | |
37 | * USB Serial console driver | |
38 | * | |
39 | * Much of the code here is copied from drivers/char/serial.c | |
40 | * and implements a phony serial console in the same way that | |
41 | * serial.c does so that in case some software queries it, | |
42 | * it will get the same results. | |
43 | * | |
44 | * Things that are different from the way the serial port code | |
45 | * does things, is that we call the lower level usb-serial | |
46 | * driver code to initialize the device, and we set the initial | |
47 | * console speeds based on the command line arguments. | |
48 | * ------------------------------------------------------------ | |
49 | */ | |
50 | ||
51 | ||
52 | /* | |
53 | * The parsing of the command line works exactly like the | |
54 | * serial.c code, except that the specifier is "ttyUSB" instead | |
55 | * of "ttyS". | |
56 | */ | |
57 | static int __init usb_console_setup(struct console *co, char *options) | |
58 | { | |
59 | struct usbcons_info *info = &usbcons_info; | |
60 | int baud = 9600; | |
61 | int bits = 8; | |
62 | int parity = 'n'; | |
63 | int doflow = 0; | |
64 | int cflag = CREAD | HUPCL | CLOCAL; | |
65 | char *s; | |
66 | struct usb_serial *serial; | |
67 | struct usb_serial_port *port; | |
68 | int retval = 0; | |
69 | struct tty_struct *tty; | |
70 | struct termios *termios; | |
71 | ||
72 | dbg ("%s", __FUNCTION__); | |
73 | ||
74 | if (options) { | |
75 | baud = simple_strtoul(options, NULL, 10); | |
76 | s = options; | |
77 | while (*s >= '0' && *s <= '9') | |
78 | s++; | |
79 | if (*s) | |
80 | parity = *s++; | |
81 | if (*s) | |
82 | bits = *s++ - '0'; | |
83 | if (*s) | |
84 | doflow = (*s++ == 'r'); | |
85 | } | |
86 | ||
87 | /* build a cflag setting */ | |
88 | switch (baud) { | |
89 | case 1200: | |
90 | cflag |= B1200; | |
91 | break; | |
92 | case 2400: | |
93 | cflag |= B2400; | |
94 | break; | |
95 | case 4800: | |
96 | cflag |= B4800; | |
97 | break; | |
98 | case 19200: | |
99 | cflag |= B19200; | |
100 | break; | |
101 | case 38400: | |
102 | cflag |= B38400; | |
103 | break; | |
104 | case 57600: | |
105 | cflag |= B57600; | |
106 | break; | |
107 | case 115200: | |
108 | cflag |= B115200; | |
109 | break; | |
110 | case 9600: | |
111 | default: | |
112 | cflag |= B9600; | |
113 | /* | |
114 | * Set this to a sane value to prevent a divide error | |
115 | */ | |
116 | baud = 9600; | |
117 | break; | |
118 | } | |
119 | switch (bits) { | |
120 | case 7: | |
121 | cflag |= CS7; | |
122 | break; | |
123 | default: | |
124 | case 8: | |
125 | cflag |= CS8; | |
126 | break; | |
127 | } | |
128 | switch (parity) { | |
129 | case 'o': case 'O': | |
130 | cflag |= PARODD; | |
131 | break; | |
132 | case 'e': case 'E': | |
133 | cflag |= PARENB; | |
134 | break; | |
135 | } | |
136 | co->cflag = cflag; | |
137 | ||
138 | /* grab the first serial port that happens to be connected */ | |
139 | serial = usb_serial_get_by_index(0); | |
140 | if (serial == NULL) { | |
141 | /* no device is connected yet, sorry :( */ | |
142 | err ("No USB device connected to ttyUSB0"); | |
143 | return -ENODEV; | |
144 | } | |
145 | ||
146 | port = serial->port[0]; | |
147 | port->tty = NULL; | |
148 | ||
149 | info->port = port; | |
150 | ||
151 | ++port->open_count; | |
152 | if (port->open_count == 1) { | |
153 | /* only call the device specific open if this | |
154 | * is the first time the port is opened */ | |
155 | if (serial->type->open) | |
156 | retval = serial->type->open(port, NULL); | |
157 | else | |
158 | retval = usb_serial_generic_open(port, NULL); | |
159 | if (retval) | |
160 | port->open_count = 0; | |
161 | } | |
162 | ||
163 | if (retval) { | |
164 | err ("could not open USB console port"); | |
165 | return retval; | |
166 | } | |
167 | ||
168 | if (serial->type->set_termios) { | |
169 | /* build up a fake tty structure so that the open call has something | |
170 | * to look at to get the cflag value */ | |
171 | tty = kmalloc (sizeof (*tty), GFP_KERNEL); | |
172 | if (!tty) { | |
173 | err ("no more memory"); | |
174 | return -ENOMEM; | |
175 | } | |
176 | termios = kmalloc (sizeof (*termios), GFP_KERNEL); | |
177 | if (!termios) { | |
178 | err ("no more memory"); | |
179 | kfree (tty); | |
180 | return -ENOMEM; | |
181 | } | |
182 | memset (tty, 0x00, sizeof(*tty)); | |
183 | memset (termios, 0x00, sizeof(*termios)); | |
184 | termios->c_cflag = cflag; | |
185 | tty->termios = termios; | |
186 | port->tty = tty; | |
187 | ||
188 | /* set up the initial termios settings */ | |
189 | serial->type->set_termios(port, NULL); | |
190 | port->tty = NULL; | |
191 | kfree (termios); | |
192 | kfree (tty); | |
193 | } | |
194 | ||
195 | return retval; | |
196 | } | |
197 | ||
198 | static void usb_console_write(struct console *co, const char *buf, unsigned count) | |
199 | { | |
200 | static struct usbcons_info *info = &usbcons_info; | |
201 | struct usb_serial_port *port = info->port; | |
202 | struct usb_serial *serial; | |
203 | int retval = -ENODEV; | |
204 | ||
205 | if (!port) | |
206 | return; | |
207 | serial = port->serial; | |
208 | ||
209 | if (count == 0) | |
210 | return; | |
211 | ||
212 | dbg("%s - port %d, %d byte(s)", __FUNCTION__, port->number, count); | |
213 | ||
214 | if (!port->open_count) { | |
215 | dbg ("%s - port not opened", __FUNCTION__); | |
216 | goto exit; | |
217 | } | |
218 | ||
219 | /* pass on to the driver specific version of this function if it is available */ | |
220 | if (serial->type->write) | |
221 | retval = serial->type->write(port, buf, count); | |
222 | else | |
223 | retval = usb_serial_generic_write(port, buf, count); | |
224 | ||
225 | exit: | |
226 | dbg("%s - return value (if we had one): %d", __FUNCTION__, retval); | |
227 | } | |
228 | ||
229 | static struct console usbcons = { | |
230 | .name = "ttyUSB", | |
231 | .write = usb_console_write, | |
232 | .setup = usb_console_setup, | |
233 | .flags = CON_PRINTBUFFER, | |
234 | .index = -1, | |
235 | }; | |
236 | ||
237 | void usb_serial_console_init (int serial_debug, int minor) | |
238 | { | |
239 | debug = serial_debug; | |
240 | ||
241 | if (minor == 0) { | |
242 | /* | |
243 | * Call register_console() if this is the first device plugged | |
244 | * in. If we call it earlier, then the callback to | |
245 | * console_setup() will fail, as there is not a device seen by | |
246 | * the USB subsystem yet. | |
247 | */ | |
248 | /* | |
249 | * Register console. | |
250 | * NOTES: | |
251 | * console_setup() is called (back) immediately (from register_console). | |
252 | * console_write() is called immediately from register_console iff | |
253 | * CON_PRINTBUFFER is set in flags. | |
254 | */ | |
255 | dbg ("registering the USB serial console."); | |
256 | register_console(&usbcons); | |
257 | } | |
258 | } | |
259 | ||
260 | void usb_serial_console_exit (void) | |
261 | { | |
262 | unregister_console(&usbcons); | |
263 | } | |
264 |