177 lines
3.6 KiB
C
177 lines
3.6 KiB
C
/*
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* ARAnyM console driver
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/console.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/uaccess.h>
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#include <linux/io.h>
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#include <asm/natfeat.h>
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static int stderr_id;
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static struct tty_port nfcon_tty_port;
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static struct tty_driver *nfcon_tty_driver;
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static void nfputs(const char *str, unsigned int count)
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{
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char buf[68];
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unsigned long phys = virt_to_phys(buf);
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buf[64] = 0;
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while (count > 64) {
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memcpy(buf, str, 64);
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nf_call(stderr_id, phys);
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str += 64;
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count -= 64;
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}
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memcpy(buf, str, count);
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buf[count] = 0;
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nf_call(stderr_id, phys);
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}
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static void nfcon_write(struct console *con, const char *str,
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unsigned int count)
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{
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nfputs(str, count);
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}
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static struct tty_driver *nfcon_device(struct console *con, int *index)
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{
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*index = 0;
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return console_is_registered(con) ? nfcon_tty_driver : NULL;
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}
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static struct console nf_console = {
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.name = "nfcon",
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.write = nfcon_write,
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.device = nfcon_device,
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.flags = CON_PRINTBUFFER,
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.index = -1,
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};
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static int nfcon_tty_open(struct tty_struct *tty, struct file *filp)
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{
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return 0;
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}
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static void nfcon_tty_close(struct tty_struct *tty, struct file *filp)
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{
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}
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static int nfcon_tty_write(struct tty_struct *tty, const unsigned char *buf,
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int count)
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{
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nfputs(buf, count);
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return count;
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}
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static int nfcon_tty_put_char(struct tty_struct *tty, unsigned char ch)
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{
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char temp[2] = { ch, 0 };
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nf_call(stderr_id, virt_to_phys(temp));
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return 1;
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}
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static unsigned int nfcon_tty_write_room(struct tty_struct *tty)
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{
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return 64;
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}
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static const struct tty_operations nfcon_tty_ops = {
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.open = nfcon_tty_open,
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.close = nfcon_tty_close,
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.write = nfcon_tty_write,
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.put_char = nfcon_tty_put_char,
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.write_room = nfcon_tty_write_room,
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};
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#ifndef MODULE
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static int __init nf_debug_setup(char *arg)
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{
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if (strcmp(arg, "nfcon"))
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return 0;
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stderr_id = nf_get_id("NF_STDERR");
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if (stderr_id) {
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/*
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* The console will be enabled when debug=nfcon is specified
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* as a kernel parameter. Since this is a non-standard way
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* of enabling consoles, it must be explicitly enabled.
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*/
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nf_console.flags |= CON_ENABLED;
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register_console(&nf_console);
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}
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return 0;
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}
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early_param("debug", nf_debug_setup);
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#endif /* !MODULE */
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static int __init nfcon_init(void)
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{
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struct tty_driver *driver;
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int res;
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stderr_id = nf_get_id("NF_STDERR");
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if (!stderr_id)
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return -ENODEV;
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driver = tty_alloc_driver(1, TTY_DRIVER_REAL_RAW);
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if (IS_ERR(driver))
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return PTR_ERR(driver);
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tty_port_init(&nfcon_tty_port);
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driver->driver_name = "nfcon";
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driver->name = "nfcon";
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driver->type = TTY_DRIVER_TYPE_SYSTEM;
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driver->subtype = SYSTEM_TYPE_TTY;
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driver->init_termios = tty_std_termios;
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tty_set_operations(driver, &nfcon_tty_ops);
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tty_port_link_device(&nfcon_tty_port, driver, 0);
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res = tty_register_driver(driver);
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if (res) {
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pr_err("failed to register nfcon tty driver\n");
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tty_driver_kref_put(driver);
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tty_port_destroy(&nfcon_tty_port);
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return res;
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}
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nfcon_tty_driver = driver;
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if (!console_is_registered(&nf_console))
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register_console(&nf_console);
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return 0;
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}
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static void __exit nfcon_exit(void)
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{
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unregister_console(&nf_console);
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tty_unregister_driver(nfcon_tty_driver);
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tty_driver_kref_put(nfcon_tty_driver);
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tty_port_destroy(&nfcon_tty_port);
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}
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module_init(nfcon_init);
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module_exit(nfcon_exit);
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MODULE_LICENSE("GPL");
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