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TOMOYO Linux Cross Reference
Linux/arch/um/drivers/ssl.c

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  1 /* 
  2  * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
  3  * Licensed under the GPL
  4  */
  5 
  6 #include "linux/fs.h"
  7 #include "linux/tty.h"
  8 #include "linux/tty_driver.h"
  9 #include "linux/major.h"
 10 #include "linux/mm.h"
 11 #include "linux/init.h"
 12 #include "linux/console.h"
 13 #include "asm/termbits.h"
 14 #include "asm/irq.h"
 15 #include "line.h"
 16 #include "ssl.h"
 17 #include "chan_kern.h"
 18 #include "kern.h"
 19 #include "init.h"
 20 #include "irq_user.h"
 21 #include "mconsole_kern.h"
 22 
 23 static const int ssl_version = 1;
 24 
 25 /* Referenced only by tty_driver below - presumably it's locked correctly
 26  * by the tty driver.
 27  */
 28 
 29 static struct tty_driver *ssl_driver;
 30 
 31 #define NR_PORTS 64
 32 
 33 static void ssl_announce(char *dev_name, int dev)
 34 {
 35         printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev,
 36                dev_name);
 37 }
 38 
 39 /* Almost const, except that xterm_title may be changed in an initcall */
 40 static struct chan_opts opts = {
 41         .announce       = ssl_announce,
 42         .xterm_title    = "Serial Line #%d",
 43         .raw            = 1,
 44 };
 45 
 46 static int ssl_config(char *str, char **error_out);
 47 static int ssl_get_config(char *dev, char *str, int size, char **error_out);
 48 static int ssl_remove(int n, char **error_out);
 49 
 50 
 51 /* Const, except for .mc.list */
 52 static struct line_driver driver = {
 53         .name                   = "UML serial line",
 54         .device_name            = "ttyS",
 55         .major                  = TTY_MAJOR,
 56         .minor_start            = 64,
 57         .type                   = TTY_DRIVER_TYPE_SERIAL,
 58         .subtype                = 0,
 59         .read_irq               = SSL_IRQ,
 60         .read_irq_name          = "ssl",
 61         .write_irq              = SSL_WRITE_IRQ,
 62         .write_irq_name         = "ssl-write",
 63         .mc  = {
 64                 .list           = LIST_HEAD_INIT(driver.mc.list),
 65                 .name           = "ssl",
 66                 .config         = ssl_config,
 67                 .get_config     = ssl_get_config,
 68                 .id             = line_id,
 69                 .remove         = ssl_remove,
 70         },
 71 };
 72 
 73 /* The array is initialized by line_init, at initcall time.  The
 74  * elements are locked individually as needed.
 75  */
 76 static struct line serial_lines[NR_PORTS] =
 77         { [0 ... NR_PORTS - 1] = LINE_INIT(CONFIG_SSL_CHAN, &driver) };
 78 
 79 static int ssl_config(char *str, char **error_out)
 80 {
 81         return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts,
 82                            error_out);
 83 }
 84 
 85 static int ssl_get_config(char *dev, char *str, int size, char **error_out)
 86 {
 87         return line_get_config(dev, serial_lines, ARRAY_SIZE(serial_lines), str,
 88                                size, error_out);
 89 }
 90 
 91 static int ssl_remove(int n, char **error_out)
 92 {
 93         return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n,
 94                            error_out);
 95 }
 96 
 97 static int ssl_open(struct tty_struct *tty, struct file *filp)
 98 {
 99         int err = line_open(serial_lines, tty);
100 
101         if (err)
102                 printk(KERN_ERR "Failed to open serial line %d, err = %d\n",
103                        tty->index, err);
104 
105         return err;
106 }
107 
108 #if 0
109 static void ssl_flush_buffer(struct tty_struct *tty)
110 {
111         return;
112 }
113 
114 static void ssl_stop(struct tty_struct *tty)
115 {
116         printk(KERN_ERR "Someone should implement ssl_stop\n");
117 }
118 
119 static void ssl_start(struct tty_struct *tty)
120 {
121         printk(KERN_ERR "Someone should implement ssl_start\n");
122 }
123 
124 void ssl_hangup(struct tty_struct *tty)
125 {
126 }
127 #endif
128 
129 static const struct tty_operations ssl_ops = {
130         .open                   = ssl_open,
131         .close                  = line_close,
132         .write                  = line_write,
133         .put_char               = line_put_char,
134         .write_room             = line_write_room,
135         .chars_in_buffer        = line_chars_in_buffer,
136         .flush_buffer           = line_flush_buffer,
137         .flush_chars            = line_flush_chars,
138         .set_termios            = line_set_termios,
139         .ioctl                  = line_ioctl,
140         .throttle               = line_throttle,
141         .unthrottle             = line_unthrottle,
142 #if 0
143         .stop                   = ssl_stop,
144         .start                  = ssl_start,
145         .hangup                 = ssl_hangup,
146 #endif
147 };
148 
149 /* Changed by ssl_init and referenced by ssl_exit, which are both serialized
150  * by being an initcall and exitcall, respectively.
151  */
152 static int ssl_init_done = 0;
153 
154 static void ssl_console_write(struct console *c, const char *string,
155                               unsigned len)
156 {
157         struct line *line = &serial_lines[c->index];
158         unsigned long flags;
159 
160         spin_lock_irqsave(&line->lock, flags);
161         console_write_chan(&line->chan_list, string, len);
162         spin_unlock_irqrestore(&line->lock, flags);
163 }
164 
165 static struct tty_driver *ssl_console_device(struct console *c, int *index)
166 {
167         *index = c->index;
168         return ssl_driver;
169 }
170 
171 static int ssl_console_setup(struct console *co, char *options)
172 {
173         struct line *line = &serial_lines[co->index];
174 
175         return console_open_chan(line, co);
176 }
177 
178 /* No locking for register_console call - relies on single-threaded initcalls */
179 static struct console ssl_cons = {
180         .name           = "ttyS",
181         .write          = ssl_console_write,
182         .device         = ssl_console_device,
183         .setup          = ssl_console_setup,
184         .flags          = CON_PRINTBUFFER|CON_ANYTIME,
185         .index          = -1,
186 };
187 
188 static int ssl_init(void)
189 {
190         char *new_title;
191 
192         printk(KERN_INFO "Initializing software serial port version %d\n",
193                ssl_version);
194         ssl_driver = register_lines(&driver, &ssl_ops, serial_lines,
195                                     ARRAY_SIZE(serial_lines));
196 
197         new_title = add_xterm_umid(opts.xterm_title);
198         if (new_title != NULL)
199                 opts.xterm_title = new_title;
200 
201         lines_init(serial_lines, ARRAY_SIZE(serial_lines), &opts);
202 
203         ssl_init_done = 1;
204         register_console(&ssl_cons);
205         return 0;
206 }
207 late_initcall(ssl_init);
208 
209 static void ssl_exit(void)
210 {
211         if (!ssl_init_done)
212                 return;
213         close_lines(serial_lines, ARRAY_SIZE(serial_lines));
214 }
215 __uml_exitcall(ssl_exit);
216 
217 static int ssl_chan_setup(char *str)
218 {
219         char *error;
220         int ret;
221 
222         ret = line_setup(serial_lines, ARRAY_SIZE(serial_lines), str, &error);
223         if(ret < 0)
224                 printk(KERN_ERR "Failed to set up serial line with "
225                        "configuration string \"%s\" : %s\n", str, error);
226 
227         return 1;
228 }
229 
230 __setup("ssl", ssl_chan_setup);
231 __channel_help(ssl_chan_setup, "ssl");
232 

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