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-rw-r--r--arch/um/drivers/chan_kern.c577
1 files changed, 577 insertions, 0 deletions
diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
new file mode 100644
index 00000000000..1f77deb3fd2
--- /dev/null
+++ b/arch/um/drivers/chan_kern.c
@@ -0,0 +1,577 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/stddef.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/string.h>
+#include <linux/tty_flip.h>
+#include <asm/irq.h>
+#include "chan_kern.h"
+#include "user_util.h"
+#include "kern.h"
+#include "irq_user.h"
+#include "sigio.h"
+#include "line.h"
+#include "os.h"
+
+#ifdef CONFIG_NOCONFIG_CHAN
+static void *not_configged_init(char *str, int device, struct chan_opts *opts)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+ return(NULL);
+}
+
+static int not_configged_open(int input, int output, int primary, void *data,
+ char **dev_out)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+ return(-ENODEV);
+}
+
+static void not_configged_close(int fd, void *data)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+}
+
+static int not_configged_read(int fd, char *c_out, void *data)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+ return(-EIO);
+}
+
+static int not_configged_write(int fd, const char *buf, int len, void *data)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+ return(-EIO);
+}
+
+static int not_configged_console_write(int fd, const char *buf, int len,
+ void *data)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+ return(-EIO);
+}
+
+static int not_configged_window_size(int fd, void *data, unsigned short *rows,
+ unsigned short *cols)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+ return(-ENODEV);
+}
+
+static void not_configged_free(void *data)
+{
+ printk(KERN_ERR "Using a channel type which is configured out of "
+ "UML\n");
+}
+
+static struct chan_ops not_configged_ops = {
+ .init = not_configged_init,
+ .open = not_configged_open,
+ .close = not_configged_close,
+ .read = not_configged_read,
+ .write = not_configged_write,
+ .console_write = not_configged_console_write,
+ .window_size = not_configged_window_size,
+ .free = not_configged_free,
+ .winch = 0,
+};
+#endif /* CONFIG_NOCONFIG_CHAN */
+
+void generic_close(int fd, void *unused)
+{
+ os_close_file(fd);
+}
+
+int generic_read(int fd, char *c_out, void *unused)
+{
+ int n;
+
+ n = os_read_file(fd, c_out, sizeof(*c_out));
+
+ if(n == -EAGAIN)
+ return(0);
+ else if(n == 0)
+ return(-EIO);
+ return(n);
+}
+
+/* XXX Trivial wrapper around os_write_file */
+
+int generic_write(int fd, const char *buf, int n, void *unused)
+{
+ return(os_write_file(fd, buf, n));
+}
+
+int generic_window_size(int fd, void *unused, unsigned short *rows_out,
+ unsigned short *cols_out)
+{
+ int rows, cols;
+ int ret;
+
+ ret = os_window_size(fd, &rows, &cols);
+ if(ret < 0)
+ return(ret);
+
+ ret = ((*rows_out != rows) || (*cols_out != cols));
+
+ *rows_out = rows;
+ *cols_out = cols;
+
+ return(ret);
+}
+
+void generic_free(void *data)
+{
+ kfree(data);
+}
+
+static void tty_receive_char(struct tty_struct *tty, char ch)
+{
+ if(tty == NULL) return;
+
+ if(I_IXON(tty) && !I_IXOFF(tty) && !tty->raw) {
+ if(ch == STOP_CHAR(tty)){
+ stop_tty(tty);
+ return;
+ }
+ else if(ch == START_CHAR(tty)){
+ start_tty(tty);
+ return;
+ }
+ }
+
+ if((tty->flip.flag_buf_ptr == NULL) ||
+ (tty->flip.char_buf_ptr == NULL))
+ return;
+ tty_insert_flip_char(tty, ch, TTY_NORMAL);
+}
+
+static int open_one_chan(struct chan *chan, int input, int output, int primary)
+{
+ int fd;
+
+ if(chan->opened) return(0);
+ if(chan->ops->open == NULL) fd = 0;
+ else fd = (*chan->ops->open)(input, output, primary, chan->data,
+ &chan->dev);
+ if(fd < 0) return(fd);
+ chan->fd = fd;
+
+ chan->opened = 1;
+ return(0);
+}
+
+int open_chan(struct list_head *chans)
+{
+ struct list_head *ele;
+ struct chan *chan;
+ int ret, err = 0;
+
+ list_for_each(ele, chans){
+ chan = list_entry(ele, struct chan, list);
+ ret = open_one_chan(chan, chan->input, chan->output,
+ chan->primary);
+ if(chan->primary) err = ret;
+ }
+ return(err);
+}
+
+void chan_enable_winch(struct list_head *chans, struct tty_struct *tty)
+{
+ struct list_head *ele;
+ struct chan *chan;
+
+ list_for_each(ele, chans){
+ chan = list_entry(ele, struct chan, list);
+ if(chan->primary && chan->output && chan->ops->winch){
+ register_winch(chan->fd, tty);
+ return;
+ }
+ }
+}
+
+void enable_chan(struct list_head *chans, struct tty_struct *tty)
+{
+ struct list_head *ele;
+ struct chan *chan;
+
+ list_for_each(ele, chans){
+ chan = list_entry(ele, struct chan, list);
+ if(!chan->opened) continue;
+
+ line_setup_irq(chan->fd, chan->input, chan->output, tty);
+ }
+}
+
+void close_chan(struct list_head *chans)
+{
+ struct chan *chan;
+
+ /* Close in reverse order as open in case more than one of them
+ * refers to the same device and they save and restore that device's
+ * state. Then, the first one opened will have the original state,
+ * so it must be the last closed.
+ */
+ list_for_each_entry_reverse(chan, chans, list) {
+ if(!chan->opened) continue;
+ if(chan->ops->close != NULL)
+ (*chan->ops->close)(chan->fd, chan->data);
+ chan->opened = 0;
+ chan->fd = -1;
+ }
+}
+
+int write_chan(struct list_head *chans, const char *buf, int len,
+ int write_irq)
+{
+ struct list_head *ele;
+ struct chan *chan = NULL;
+ int n, ret = 0;
+
+ list_for_each(ele, chans) {
+ chan = list_entry(ele, struct chan, list);
+ if (!chan->output || (chan->ops->write == NULL))
+ continue;
+ n = chan->ops->write(chan->fd, buf, len, chan->data);
+ if (chan->primary) {
+ ret = n;
+ if ((ret == -EAGAIN) || ((ret >= 0) && (ret < len)))
+ reactivate_fd(chan->fd, write_irq);
+ }
+ }
+ return(ret);
+}
+
+int console_write_chan(struct list_head *chans, const char *buf, int len)
+{
+ struct list_head *ele;
+ struct chan *chan;
+ int n, ret = 0;
+
+ list_for_each(ele, chans){
+ chan = list_entry(ele, struct chan, list);
+ if(!chan->output || (chan->ops->console_write == NULL))
+ continue;
+ n = chan->ops->console_write(chan->fd, buf, len, chan->data);
+ if(chan->primary) ret = n;
+ }
+ return(ret);
+}
+
+int console_open_chan(struct line *line, struct console *co, struct chan_opts *opts)
+{
+ if (!list_empty(&line->chan_list))
+ return 0;
+
+ if (0 != parse_chan_pair(line->init_str, &line->chan_list,
+ line->init_pri, co->index, opts))
+ return -1;
+ if (0 != open_chan(&line->chan_list))
+ return -1;
+ printk("Console initialized on /dev/%s%d\n",co->name,co->index);
+ return 0;
+}
+
+int chan_window_size(struct list_head *chans, unsigned short *rows_out,
+ unsigned short *cols_out)
+{
+ struct list_head *ele;
+ struct chan *chan;
+
+ list_for_each(ele, chans){
+ chan = list_entry(ele, struct chan, list);
+ if(chan->primary){
+ if(chan->ops->window_size == NULL) return(0);
+ return(chan->ops->window_size(chan->fd, chan->data,
+ rows_out, cols_out));
+ }
+ }
+ return(0);
+}
+
+void free_one_chan(struct chan *chan)
+{
+ list_del(&chan->list);
+ if(chan->ops->free != NULL)
+ (*chan->ops->free)(chan->data);
+ free_irq_by_fd(chan->fd);
+ if(chan->primary && chan->output) ignore_sigio_fd(chan->fd);
+ kfree(chan);
+}
+
+void free_chan(struct list_head *chans)
+{
+ struct list_head *ele, *next;
+ struct chan *chan;
+
+ list_for_each_safe(ele, next, chans){
+ chan = list_entry(ele, struct chan, list);
+ free_one_chan(chan);
+ }
+}
+
+static int one_chan_config_string(struct chan *chan, char *str, int size,
+ char **error_out)
+{
+ int n = 0;
+
+ if(chan == NULL){
+ CONFIG_CHUNK(str, size, n, "none", 1);
+ return(n);
+ }
+
+ CONFIG_CHUNK(str, size, n, chan->ops->type, 0);
+
+ if(chan->dev == NULL){
+ CONFIG_CHUNK(str, size, n, "", 1);
+ return(n);
+ }
+
+ CONFIG_CHUNK(str, size, n, ":", 0);
+ CONFIG_CHUNK(str, size, n, chan->dev, 0);
+
+ return(n);
+}
+
+static int chan_pair_config_string(struct chan *in, struct chan *out,
+ char *str, int size, char **error_out)
+{
+ int n;
+
+ n = one_chan_config_string(in, str, size, error_out);
+ str += n;
+ size -= n;
+
+ if(in == out){
+ CONFIG_CHUNK(str, size, n, "", 1);
+ return(n);
+ }
+
+ CONFIG_CHUNK(str, size, n, ",", 1);
+ n = one_chan_config_string(out, str, size, error_out);
+ str += n;
+ size -= n;
+ CONFIG_CHUNK(str, size, n, "", 1);
+
+ return(n);
+}
+
+int chan_config_string(struct list_head *chans, char *str, int size,
+ char **error_out)
+{
+ struct list_head *ele;
+ struct chan *chan, *in = NULL, *out = NULL;
+
+ list_for_each(ele, chans){
+ chan = list_entry(ele, struct chan, list);
+ if(!chan->primary)
+ continue;
+ if(chan->input)
+ in = chan;
+ if(chan->output)
+ out = chan;
+ }
+
+ return(chan_pair_config_string(in, out, str, size, error_out));
+}
+
+struct chan_type {
+ char *key;
+ struct chan_ops *ops;
+};
+
+struct chan_type chan_table[] = {
+ { "fd", &fd_ops },
+
+#ifdef CONFIG_NULL_CHAN
+ { "null", &null_ops },
+#else
+ { "null", &not_configged_ops },
+#endif
+
+#ifdef CONFIG_PORT_CHAN
+ { "port", &port_ops },
+#else
+ { "port", &not_configged_ops },
+#endif
+
+#ifdef CONFIG_PTY_CHAN
+ { "pty", &pty_ops },
+ { "pts", &pts_ops },
+#else
+ { "pty", &not_configged_ops },
+ { "pts", &not_configged_ops },
+#endif
+
+#ifdef CONFIG_TTY_CHAN
+ { "tty", &tty_ops },
+#else
+ { "tty", &not_configged_ops },
+#endif
+
+#ifdef CONFIG_XTERM_CHAN
+ { "xterm", &xterm_ops },
+#else
+ { "xterm", &not_configged_ops },
+#endif
+};
+
+static struct chan *parse_chan(char *str, int pri, int device,
+ struct chan_opts *opts)
+{
+ struct chan_type *entry;
+ struct chan_ops *ops;
+ struct chan *chan;
+ void *data;
+ int i;
+
+ ops = NULL;
+ data = NULL;
+ for(i = 0; i < sizeof(chan_table)/sizeof(chan_table[0]); i++){
+ entry = &chan_table[i];
+ if(!strncmp(str, entry->key, strlen(entry->key))){
+ ops = entry->ops;
+ str += strlen(entry->key);
+ break;
+ }
+ }
+ if(ops == NULL){
+ printk(KERN_ERR "parse_chan couldn't parse \"%s\"\n",
+ str);
+ return(NULL);
+ }
+ if(ops->init == NULL) return(NULL);
+ data = (*ops->init)(str, device, opts);
+ if(data == NULL) return(NULL);
+
+ chan = kmalloc(sizeof(*chan), GFP_KERNEL);
+ if(chan == NULL) return(NULL);
+ *chan = ((struct chan) { .list = LIST_HEAD_INIT(chan->list),
+ .primary = 1,
+ .input = 0,
+ .output = 0,
+ .opened = 0,
+ .fd = -1,
+ .pri = pri,
+ .ops = ops,
+ .data = data });
+ return(chan);
+}
+
+int parse_chan_pair(char *str, struct list_head *chans, int pri, int device,
+ struct chan_opts *opts)
+{
+ struct chan *new, *chan;
+ char *in, *out;
+
+ if(!list_empty(chans)){
+ chan = list_entry(chans->next, struct chan, list);
+ if(chan->pri >= pri) return(0);
+ free_chan(chans);
+ INIT_LIST_HEAD(chans);
+ }
+
+ out = strchr(str, ',');
+ if(out != NULL){
+ in = str;
+ *out = '\0';
+ out++;
+ new = parse_chan(in, pri, device, opts);
+ if(new == NULL) return(-1);
+ new->input = 1;
+ list_add(&new->list, chans);
+
+ new = parse_chan(out, pri, device, opts);
+ if(new == NULL) return(-1);
+ list_add(&new->list, chans);
+ new->output = 1;
+ }
+ else {
+ new = parse_chan(str, pri, device, opts);
+ if(new == NULL) return(-1);
+ list_add(&new->list, chans);
+ new->input = 1;
+ new->output = 1;
+ }
+ return(0);
+}
+
+int chan_out_fd(struct list_head *chans)
+{
+ struct list_head *ele;
+ struct chan *chan;
+
+ list_for_each(ele, chans){
+ chan = list_entry(ele, struct chan, list);
+ if(chan->primary && chan->output)
+ return(chan->fd);
+ }
+ return(-1);
+}
+
+void chan_interrupt(struct list_head *chans, struct work_struct *task,
+ struct tty_struct *tty, int irq)
+{
+ struct list_head *ele, *next;
+ struct chan *chan;
+ int err;
+ char c;
+
+ list_for_each_safe(ele, next, chans){
+ chan = list_entry(ele, struct chan, list);
+ if(!chan->input || (chan->ops->read == NULL)) continue;
+ do {
+ if((tty != NULL) &&
+ (tty->flip.count >= TTY_FLIPBUF_SIZE)){
+ schedule_work(task);
+ goto out;
+ }
+ err = chan->ops->read(chan->fd, &c, chan->data);
+ if(err > 0)
+ tty_receive_char(tty, c);
+ } while(err > 0);
+
+ if(err == 0) reactivate_fd(chan->fd, irq);
+ if(err == -EIO){
+ if(chan->primary){
+ if(tty != NULL)
+ tty_hangup(tty);
+ line_disable(tty, irq);
+ close_chan(chans);
+ free_chan(chans);
+ return;
+ }
+ else {
+ if(chan->ops->close != NULL)
+ chan->ops->close(chan->fd, chan->data);
+ free_one_chan(chan);
+ }
+ }
+ }
+ out:
+ if(tty) tty_flip_buffer_push(tty);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
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