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Subject[PATCH] 2.4.17 drivers/sbus/char/zs.c
As part of my preparations for writing a driver for the Magma high speed
communication SBus cards on SPARCstations, I have modified zs.c in
drivers/sbus/char to add in the missing /proc/tty/driver/serial entry.
I've learned a lot, hope this patch is useful. Notice that it doesn't yet
implement tx and rx counters, as the driver doesn't keep track, presumably
to keep it fast as possible.

--- linux-2.4.17/drivers/sbus/char/zs.c.orig Mon Dec 24 01:04:03 2001
+++ linux-2.4.17/drivers/sbus/char/zs.c Mon Dec 24 02:56:01 2001
@@ -7,6 +7,10 @@
*
* Fixed to use tty_get_baud_rate().
* Theodore Ts'o <tytso@mit.edu>, 2001-Oct-12
+ *
+ * /proc/tty/driver/serial now exists and is readable.
+ * Alex Buell <alex.buell@tahallah.demon.co.uk>, 2001-12-23
+ *
*/

#include <linux/errno.h>
@@ -1699,6 +1703,81 @@
}

/*
+ *
+ * line_info - returns information about each channel
+ *
+ */
+static inline int line_info(char *buf, struct sun_serial *info)
+{
+ unsigned char status;
+ char stat_buf[30];
+ int ret;
+
+ ret = sprintf(buf, "%d: uart:Zilog8530 port:%x irq:%d",
+ info->line, info->port, info->irq);
+
+ cli();
+ status = sbus_readb(&info->zs_channel->control);
+ ZSDELAY();
+ ZSLOG(REGCTRL, status, 0);
+ sti();
+
+ stat_buf[0] = 0;
+ stat_buf[1] = 0;
+ if (info->curregs[5] & RTS)
+ strcat(stat_buf, "|RTS");
+ if (status & CTS)
+ strcat(stat_buf, "|CTS");
+ if (info->curregs[5] & DTR)
+ strcat(stat_buf, "|DTR");
+ if (status & SYNC)
+ strcat(stat_buf, "|DSR");
+ if (status & DCD)
+ strcat(stat_buf, "|CD");
+
+ ret += sprintf(buf + ret, " baud:%d %s\n", info->zs_baud, stat_buf + 1);
+ return ret;
+}
+
+/*
+ *
+ * zs_read_proc() - called when /proc/tty/driver/serial is read.
+ *
+ */
+int zs_read_proc(char *page, char **start, off_t off, int count,
+ int *eof, void *data)
+{
+ char *revision = "$Revision: 1.68 $";
+ char *version, *p;
+ int i, len = 0, l;
+ off_t begin = 0;
+
+ version = strchr(revision, ' ');
+ p = strchr(++version, ' ');
+ *p = '\0';
+ len += sprintf(page, "serinfo:1.0 driver:%s\n", version);
+ *p = ' ';
+
+ for (i = 0; i < NUM_CHANNELS && len < 4000; i++) {
+ l = line_info(page + len, &zs_soft[i]);
+ len += l;
+ if (len+begin > off+count)
+ goto done;
+ if (len+begin < off) {
+ begin += len;
+ len = 0;
+ }
+ }
+
+ *eof = 1;
+done:
+ if (off >= len+begin)
+ return 0;
+ *start = page + (off-begin);
+ return ((count < begin+len-off) ? count : begin+len-off);
+}
+
+/*
* ------------------------------------------------------------
* zs_open() and friends
* ------------------------------------------------------------
@@ -2444,8 +2523,8 @@
serial_driver.hangup = zs_hangup;

/* I'm too lazy, someone write versions of this for us. -DaveM */
- serial_driver.read_proc = 0;
- serial_driver.proc_entry = 0;
+ /* I just did. :-) -AIB 2001-12-23 */
+ serial_driver.read_proc = zs_read_proc;

/*
* The callout device is just like normal device except for
@@ -2454,7 +2533,9 @@
callout_driver = serial_driver;
callout_driver.name = "cua/%d";
callout_driver.major = TTYAUX_MAJOR;
- callout_driver.subtype = SERIAL_TYPE_CALLOUT;
+ callout_driver.subtype = SERIAL_TYPE_CALLOUT;
+ callout_driver.read_proc = 0;
+ callout_driver.proc_entry = 0;

if (tty_register_driver(&serial_driver))
panic("Couldn't register serial driver\n");

--
A big red heart, that's me!

http://www.tahallah.demon.co.uk (updated)

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