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 Cc: Wolfram Sang Cc: Jean Delvare Cc: Linux Kernel -- drivers/misc/eeprom/eeprom_93cx6.c | 3 +++ include/linux/eeprom_93cx6.h | 2 ++ 2 files changed, 5 insertions(+) Index: b/drivers/misc/eeprom/eeprom_93cx6.c =================================================================== --- a/drivers/misc/eeprom/eeprom_93cx6.c 2009-10-06 15:35:38.000000000 +0100 +++ b/drivers/misc/eeprom/eeprom_93cx6.c 2009-10-06 15:51:18.000000000 +0100 @@ -70,6 +70,7 @@ static void eeprom_93cx6_startup(struct eeprom->reg_data_out = 0; eeprom->reg_data_clock = 0; eeprom->reg_chip_select = 1; + eeprom->drive_data = 1; eeprom->register_write(eeprom); /* @@ -108,6 +109,7 @@ static void eeprom_93cx6_write_bits(stru */ eeprom->reg_data_in = 0; eeprom->reg_data_out = 0; + eeprom->drive_data = 1; /* * Start writing all bits. @@ -147,6 +149,7 @@ static void eeprom_93cx6_read_bits(struc */ eeprom->reg_data_in = 0; eeprom->reg_data_out = 0; + eeprom->drive_data = 0; /* * Start reading all bits. Index: b/include/linux/eeprom_93cx6.h =================================================================== --- a/include/linux/eeprom_93cx6.h 2009-10-06 15:35:38.000000000 +0100 +++ b/include/linux/eeprom_93cx6.h 2009-10-06 15:51:18.000000000 +0100 @@ -45,6 +45,7 @@ * @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 @@ -61,6 +62,7 @@ struct eeprom_93cx6 { int width; + char drive_data; char reg_data_in; char reg_data_out; char reg_data_clock; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/