1 files changed, 205 insertions, 0 deletions

diff --git a/drivers/w1/w1_therm.c b/drivers/w1/w1_therm.c
new file mode 100644
index 000000000000..0b1817890503
--- /dev/null
+++ b/drivers/w1/w1_therm.c
@@ -0,0 +1,205 @@
+/*
+ *      w1_therm.c
+ *
+ * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
+ * 
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the therms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <asm/types.h>
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/device.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+
+#include "w1.h"
+#include "w1_io.h"
+#include "w1_int.h"
+#include "w1_family.h"
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
+MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, temperature family.");
+
+static u8 bad_roms[][9] = {
+                                {0xaa, 0x00, 0x4b, 0x46, 0xff, 0xff, 0x0c, 0x10, 0x87}, 
+                                {}
+                        };
+
+static ssize_t w1_therm_read_name(struct device *, char *);
+static ssize_t w1_therm_read_temp(struct device *, char *);
+static ssize_t w1_therm_read_bin(struct kobject *, char *, loff_t, size_t);
+
+static struct w1_family_ops w1_therm_fops = {
+        .rname = &w1_therm_read_name,
+        .rbin = &w1_therm_read_bin,
+        .rval = &w1_therm_read_temp,
+        .rvalname = "temp1_input",
+};
+
+static ssize_t w1_therm_read_name(struct device *dev, char *buf)
+{
+        struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
+
+        return sprintf(buf, "%s\n", sl->name);
+}
+
+static inline int w1_convert_temp(u8 rom[9])
+{
+        int t, h;
+        
+        if (rom[1] == 0)
+                t = ((s32)rom[0] >> 1)*1000;
+        else
+                t = 1000*(-1*(s32)(0x100-rom[0]) >> 1);
+        
+        t -= 250;
+        h = 1000*((s32)rom[7] - (s32)rom[6]);
+        h /= (s32)rom[7];
+        t += h;
+
+        return t;
+}
+
+static ssize_t w1_therm_read_temp(struct device *dev, char *buf)
+{
+        struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
+
+        return sprintf(buf, "%d\n", w1_convert_temp(sl->rom));
+}
+
+static int w1_therm_check_rom(u8 rom[9])
+{
+        int i;
+
+        for (i=0; i<sizeof(bad_roms)/9; ++i)
+                if (!memcmp(bad_roms[i], rom, 9))
+                        return 1;
+
+        return 0;
+}
+
+static ssize_t w1_therm_read_bin(struct kobject *kobj, char *buf, loff_t off, size_t count)
+{
+        struct w1_slave *sl = container_of(container_of(kobj, struct device, kobj),
+                                                struct w1_slave, dev);
+        struct w1_master *dev = sl->master;
+        u8 rom[9], crc, verdict;
+        int i, max_trying = 10;
+
+        atomic_inc(&sl->refcnt);
+        smp_mb__after_atomic_inc();
+        if (down_interruptible(&sl->master->mutex)) {
+                count = 0;
+                goto out_dec;
+        }
+
+        if (off > W1_SLAVE_DATA_SIZE) {
+                count = 0;
+                goto out;
+        }
+        if (off + count > W1_SLAVE_DATA_SIZE) {
+                count = 0;
+                goto out;
+        }
+
+        memset(buf, 0, count);
+        memset(rom, 0, sizeof(rom));
+
+        count = 0;
+        verdict = 0;
+        crc = 0;
+
+        while (max_trying--) {
+                if (!w1_reset_bus (dev)) {
+                        int count = 0;
+                        u8 match[9] = {W1_MATCH_ROM, };
+                        unsigned int tm = 750;
+
+                        memcpy(&match[1], (u64 *) & sl->reg_num, 8);
+                        
+                        w1_write_block(dev, match, 9);
+
+                        w1_write_8(dev, W1_CONVERT_TEMP);
+
+                        while (tm) {
+                                tm = msleep_interruptible(tm);
+                                if (signal_pending(current))
+                                        flush_signals(current);
+                        }
+
+                        if (!w1_reset_bus (dev)) {
+                                w1_write_block(dev, match, 9);
+                                
+                                w1_write_8(dev, W1_READ_SCRATCHPAD);
+                                if ((count = w1_read_block(dev, rom, 9)) != 9) {
+                                        dev_warn(&dev->dev, "w1_read_block() returned %d instead of 9.\n", count);
+                                }
+
+                                crc = w1_calc_crc8(rom, 8);
+
+                                if (rom[8] == crc && rom[0])
+                                        verdict = 1;
+
+                        }
+                }
+
+                if (!w1_therm_check_rom(rom))
+                        break;
+        }
+
+        for (i = 0; i < 9; ++i)
+                count += sprintf(buf + count, "%02x ", rom[i]);
+        count += sprintf(buf + count, ": crc=%02x %s\n",
+                           crc, (verdict) ? "YES" : "NO");
+        if (verdict)
+                memcpy(sl->rom, rom, sizeof(sl->rom));
+        else
+                dev_warn(&dev->dev, "18S20 doesn't respond to CONVERT_TEMP.\n");
+
+        for (i = 0; i < 9; ++i)
+                count += sprintf(buf + count, "%02x ", sl->rom[i]);
+        
+        count += sprintf(buf + count, "t=%d\n", w1_convert_temp(rom));
+out:
+        up(&dev->mutex);
+out_dec:
+        smp_mb__before_atomic_inc();
+        atomic_dec(&sl->refcnt);
+
+        return count;
+}
+
+static struct w1_family w1_therm_family = {
+        .fid = W1_FAMILY_THERM,
+        .fops = &w1_therm_fops,
+};
+
+static int __init w1_therm_init(void)
+{
+        return w1_register_family(&w1_therm_family);
+}
+
+static void __exit w1_therm_fini(void)
+{
+        w1_unregister_family(&w1_therm_family);
+}
+
+module_init(w1_therm_init);
+module_exit(w1_therm_fini);