PCMCIA Driver
  -------------
  
  
  sysfs
  -----
  
  New PCMCIA IDs may be added to a device driver pcmcia_device_id table at
  runtime as shown below:
  
  echo "match_flags manf_id card_id func_id function device_no \
  prod_id_hash[0] prod_id_hash[1] prod_id_hash[2] prod_id_hash[3]" > \
  /sys/bus/pcmcia/drivers/{driver}/new_id
  
  All fields are passed in as hexadecimal values (no leading 0x).
  The meaning is described in the PCMCIA specification, the match_flags is
  a bitwise or-ed combination from PCMCIA_DEV_ID_MATCH_* constants
  defined in include/linux/mod_devicetable.h.
  
  Once added, the driver probe routine will be invoked for any unclaimed
  PCMCIA device listed in its (newly updated) pcmcia_device_id list.
  
  A common use-case is to add a new device according to the manufacturer ID
  and the card ID (form the manf_id and card_id file in the device tree).
  For this, just use:
  
  echo "0x3 manf_id card_id 0 0 0 0 0 0 0" > \
          /sys/bus/pcmcia/drivers/{driver}/new_id
  
  after loading the driver.