return result & 0x1;
}
+/**
+ * Does a triplet - used for searching ROM addresses.
+ * Return bits:
+ * bit 0 = id_bit
+ * bit 1 = comp_bit
+ * bit 2 = dir_taken
+ * If both bits 0 & 1 are set, the search should be restarted.
+ *
+ * @param dev the master device
+ * @param bdir the bit to write if both id_bit and comp_bit are 0
+ * @return bit fields - see above
+ */
+u8 w1_triplet(struct w1_master *dev, int bdir)
+{
+ if ( dev->bus_master->triplet )
+ return(dev->bus_master->triplet(dev->bus_master->data, bdir));
+ else {
+ u8 id_bit = w1_touch_bit(dev, 1);
+ u8 comp_bit = w1_touch_bit(dev, 1);
+ u8 retval;
+
+ if ( id_bit && comp_bit )
+ return(0x03); /* error */
+
+ if ( !id_bit && !comp_bit ) {
+ /* Both bits are valid, take the direction given */
+ retval = bdir ? 0x04 : 0;
+ } else {
+ /* Only one bit is valid, take that direction */
+ bdir = id_bit;
+ retval = id_bit ? 0x05 : 0x02;
+ }
+
+ if ( dev->bus_master->touch_bit )
+ w1_touch_bit(dev, bdir);
+ else
+ w1_write_bit(dev, bdir);
+ return(retval);
+ }
+}
+
/**
* Reads 8 bits.
*
if (dev->bus_master->search)
dev->bus_master->search(dev->bus_master->data, cb);
else
- w1_search(dev);
+ w1_search(dev, cb);
+}
+
+/**
+ * Resets the bus and then selects the slave by sending either a skip rom
+ * or a rom match.
+ * The w1 master lock must be held.
+ *
+ * @param sl the slave to select
+ * @return 0=success, anything else=error
+ */
+int w1_reset_select_slave(struct w1_slave *sl)
+{
+ if (w1_reset_bus(sl->master))
+ return -1;
+
+ if (sl->master->slave_count == 1)
+ w1_write_8(sl->master, W1_SKIP_ROM);
+ else {
+ u8 match[9] = {W1_MATCH_ROM, };
+ memcpy(&match[1], (u8 *)&sl->reg_num, 8);
+ w1_write_block(sl->master, match, 9);
+ }
+ return 0;
}
EXPORT_SYMBOL(w1_touch_bit);
EXPORT_SYMBOL(w1_read_block);
EXPORT_SYMBOL(w1_write_block);
EXPORT_SYMBOL(w1_search_devices);
+EXPORT_SYMBOL(w1_reset_select_slave);