1 files changed, 129 insertions, 0 deletions
diff --git a/env4826.c b/env4826.c
new file mode 100644
index 0000000..ead49a9
--- /dev/null
+++ b/env4826.c
@@ -0,0 +1,129 @@
+#include <err.h>
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/time.h>
+#include <sys/param.h>
+#include <sys/mman.h>
+#include <machine/cpufunc.h>
+
+#define BASE    0x200
+
+static void
+usage()
+{
+    fprintf(stderr, "usage: env4826 [-i seconds]\n");
+    exit(2);
+}
+
+static void
+pollb(void)
+{
+    int j, k, l;
+
+    j = 0;
+    do {
+        if (++j > 1000)
+            break;
+        l = inb (BASE + 1);
+    } while (!(l & 0x40));
+}
+
+static int
+read_temp()
+{
+    u_int u;
+
+    u = inl(0x6000 + 0x30);
+    u &= ~(1 << 19);
+    u |= 1 << 19;
+    outl(0x6000 + 0x30, u);
+    u = inl(0x6000 + 0x30);
+
+    outb(0x15c, 0x07); outb(0x15d, 0x06);        /* ACB2 */
+    outb(0x15c, 0x60); outb(0x15d, BASE >> 8);    /* base addr MSB */
+    outb(0x15c, 0x61); outb(0x15d, BASE & 0xff);    /* base addr LSB */
+    outb(0x15c, 0x30); outb(0x15d, 0x01);        /* enable */
+    outb(0x15c, 0xf0); outb(0x15d, 0x02);        /* internal pull-up */
+
+    outb(BASE + 5, 0);
+
+    outb(BASE + 5, 0xfe | 0x01);
+
+    usleep(100000);
+    outb(BASE + 3, 0x01);
+    pollb();
+    outb(BASE + 0, 0x90);
+    pollb();
+    outb(BASE + 0, 0x00);
+    pollb();
+    outb(BASE + 3, 0x02);
+
+    outb(BASE + 3, 0x01);
+
+    pollb();
+
+    outb(BASE + 0, 0x91);
+
+    pollb();
+
+    outb(BASE + 3, 0x10);
+
+    u = inb(BASE + 0) << 8;
+
+    pollb();
+
+    u |= inb(BASE + 0);
+
+    outb(BASE + 3, 0x02);
+
+    printf("lm75: %.2fC\n", u / 256.0);
+
+    outb(BASE + 5, 0);
+    usleep(100000);
+
+    return 0;
+}
+
+int
+main(int argc, char **argv)
+{
+    int seconds = 0;
+    char *t;
+    FILE *f;
+    int ch;
+
+    while ((ch = getopt (argc, argv, "i:")) != -1) {
+        switch(ch) {
+        case 'i':
+            seconds = strtol (optarg, &t, 10);
+            if (*t || seconds < 0)
+                usage ();
+            break;
+        default:
+            usage ();
+            break;
+        }
+    }
+
+    argc -= optind;
+    argv += optind;
+
+    if (argc != 0)
+        usage ();
+
+    f = fopen("/dev/io", "r");
+    if (!f)
+        err (1, "couldn't open /dev/io");
+
+    for (;;) {
+        read_temp ();
+        fflush(stdout);
+        if (!seconds)
+            break;
+        sleep (seconds);
+    }
+
+    return 0;
+}