eeprom_93cx6: Add data direction control.

Some devices need to know if the data is to be output or read, so add a
data direction into the eeprom structure to tell the driver whether the
data line should be driven.

The user in this case is the Micrel KS8851 which has a direction
control for the EEPROM data line and thus needs to know whether
to drive it (writing) or to tristate it for receiving.

Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Cc: Wolfram Sang <w.sang@pengutronix.de>
Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 5 insertions, 0 deletions

diff --git a/drivers/misc/eeprom/eeprom_93cx6.c b/drivers/misc/eeprom/eeprom_93cx6.c
index 7b33de95c4bf..a6037af6f076 100644
--- a/drivers/misc/eeprom/eeprom_93cx6.c
+++ b/drivers/misc/eeprom/eeprom_93cx6.c
@@ -63,6 +63,7 @@ static void eeprom_93cx6_startup(struct eeprom_93cx6 *eeprom)
         eeprom->reg_data_out = 0;
         eeprom->reg_data_clock = 0;
         eeprom->reg_chip_select = 1;
+        eeprom->drive_data = 1;
         eeprom->register_write(eeprom);
 
         /*
@@ -101,6 +102,7 @@ static void eeprom_93cx6_write_bits(struct eeprom_93cx6 *eeprom,
          */
         eeprom->reg_data_in = 0;
         eeprom->reg_data_out = 0;
+        eeprom->drive_data = 1;
 
         /*
          * Start writing all bits.
@@ -140,6 +142,7 @@ static void eeprom_93cx6_read_bits(struct eeprom_93cx6 *eeprom,
          */
         eeprom->reg_data_in = 0;
         eeprom->reg_data_out = 0;
+        eeprom->drive_data = 0;
 
         /*
          * Start reading all bits.
diff --git a/include/linux/eeprom_93cx6.h b/include/linux/eeprom_93cx6.h
index c4627cbdb8e0..e04546e9c592 100644
--- a/include/linux/eeprom_93cx6.h
+++ b/include/linux/eeprom_93cx6.h
@@ -46,6 +46,7 @@
  * @register_write(struct eeprom_93cx6 *eeprom): handler to
  * write to the eeprom register by using all reg_* fields.
  * @width: eeprom width, should be one of the PCI_EEPROM_WIDTH_* defines
+ * @drive_data: Set if we're driving the data line.
  * @reg_data_in: register field to indicate data input
  * @reg_data_out: register field to indicate data output
  * @reg_data_clock: register field to set the data clock
@@ -62,6 +63,7 @@ struct eeprom_93cx6 {
 
         int width;
 
+        char drive_data;
         char reg_data_in;
         char reg_data_out;
         char reg_data_clock;