Added w1_read_block() and w1_write_block().
w1_therm.c now uses them.
w1_therm: Chnaged snprintf to sprintf in w1_therm_read_bin() and added max_trying -
        number of tryings to read temperature before failng. By default it is 10.
        Added w1_therm_check_rom() - checks if read rom is in black list.
        If rom is in black list it is probably due to unsufficient of "power" in the sensor -
        either add strong pullup or connect it to Vcc.
Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>