diff options
Diffstat (limited to 'kernel/arch/um/drivers/ssl.c')
| -rw-r--r-- | kernel/arch/um/drivers/ssl.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/kernel/arch/um/drivers/ssl.c b/kernel/arch/um/drivers/ssl.c new file mode 100644 index 000000000..b8d14fa52 --- /dev/null +++ b/kernel/arch/um/drivers/ssl.c @@ -0,0 +1,199 @@ +/* + * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com) + * Licensed under the GPL + */ + +#include <linux/fs.h> +#include <linux/tty.h> +#include <linux/tty_driver.h> +#include <linux/major.h> +#include <linux/mm.h> +#include <linux/init.h> +#include <linux/console.h> +#include <asm/termbits.h> +#include <asm/irq.h> +#include "ssl.h" +#include "chan.h" +#include <init.h> +#include <irq_user.h> +#include "mconsole_kern.h" + +static const int ssl_version = 1; + +#define NR_PORTS 64 + +static void ssl_announce(char *dev_name, int dev) +{ + printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev, + dev_name); +} + +/* Almost const, except that xterm_title may be changed in an initcall */ +static struct chan_opts opts = { + .announce = ssl_announce, + .xterm_title = "Serial Line #%d", + .raw = 1, +}; + +static int ssl_config(char *str, char **error_out); +static int ssl_get_config(char *dev, char *str, int size, char **error_out); +static int ssl_remove(int n, char **error_out); + + +/* Const, except for .mc.list */ +static struct line_driver driver = { + .name = "UML serial line", + .device_name = "ttyS", + .major = TTY_MAJOR, + .minor_start = 64, + .type = TTY_DRIVER_TYPE_SERIAL, + .subtype = 0, + .read_irq = SSL_IRQ, + .read_irq_name = "ssl", + .write_irq = SSL_WRITE_IRQ, + .write_irq_name = "ssl-write", + .mc = { + .list = LIST_HEAD_INIT(driver.mc.list), + .name = "ssl", + .config = ssl_config, + .get_config = ssl_get_config, + .id = line_id, + .remove = ssl_remove, + }, +}; + +/* The array is initialized by line_init, at initcall time. The + * elements are locked individually as needed. + */ +static char *conf[NR_PORTS]; +static char *def_conf = CONFIG_SSL_CHAN; +static struct line serial_lines[NR_PORTS]; + +static int ssl_config(char *str, char **error_out) +{ + return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts, + error_out); +} + +static int ssl_get_config(char *dev, char *str, int size, char **error_out) +{ + return line_get_config(dev, serial_lines, ARRAY_SIZE(serial_lines), str, + size, error_out); +} + +static int ssl_remove(int n, char **error_out) +{ + return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n, + error_out); +} + +static int ssl_install(struct tty_driver *driver, struct tty_struct *tty) +{ + return line_install(driver, tty, &serial_lines[tty->index]); +} + +static const struct tty_operations ssl_ops = { + .open = line_open, + .close = line_close, + .write = line_write, + .put_char = line_put_char, + .write_room = line_write_room, + .chars_in_buffer = line_chars_in_buffer, + .flush_buffer = line_flush_buffer, + .flush_chars = line_flush_chars, + .set_termios = line_set_termios, + .throttle = line_throttle, + .unthrottle = line_unthrottle, + .install = ssl_install, + .hangup = line_hangup, +}; + +/* Changed by ssl_init and referenced by ssl_exit, which are both serialized + * by being an initcall and exitcall, respectively. + */ +static int ssl_init_done = 0; + +static void ssl_console_write(struct console *c, const char *string, + unsigned len) +{ + struct line *line = &serial_lines[c->index]; + unsigned long flags; + + spin_lock_irqsave(&line->lock, flags); + console_write_chan(line->chan_out, string, len); + spin_unlock_irqrestore(&line->lock, flags); +} + +static struct tty_driver *ssl_console_device(struct console *c, int *index) +{ + *index = c->index; + return driver.driver; +} + +static int ssl_console_setup(struct console *co, char *options) +{ + struct line *line = &serial_lines[co->index]; + + return console_open_chan(line, co); +} + +/* No locking for register_console call - relies on single-threaded initcalls */ +static struct console ssl_cons = { + .name = "ttyS", + .write = ssl_console_write, + .device = ssl_console_device, + .setup = ssl_console_setup, + .flags = CON_PRINTBUFFER|CON_ANYTIME, + .index = -1, +}; + +static int ssl_init(void) +{ + char *new_title; + int err; + int i; + + printk(KERN_INFO "Initializing software serial port version %d\n", + ssl_version); + + err = register_lines(&driver, &ssl_ops, serial_lines, + ARRAY_SIZE(serial_lines)); + if (err) + return err; + + new_title = add_xterm_umid(opts.xterm_title); + if (new_title != NULL) + opts.xterm_title = new_title; + + for (i = 0; i < NR_PORTS; i++) { + char *error; + char *s = conf[i]; + if (!s) + s = def_conf; + if (setup_one_line(serial_lines, i, s, &opts, &error)) + printk(KERN_ERR "setup_one_line failed for " + "device %d : %s\n", i, error); + } + + ssl_init_done = 1; + register_console(&ssl_cons); + return 0; +} +late_initcall(ssl_init); + +static void ssl_exit(void) +{ + if (!ssl_init_done) + return; + close_lines(serial_lines, ARRAY_SIZE(serial_lines)); +} +__uml_exitcall(ssl_exit); + +static int ssl_chan_setup(char *str) +{ + line_setup(conf, NR_PORTS, &def_conf, str, "serial line"); + return 1; +} + +__setup("ssl", ssl_chan_setup); +__channel_help(ssl_chan_setup, "ssl"); |