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eeprom_93cx6: Add data direction control.

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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>
This commit is contained in:
Ben Dooks 2011-11-21 08:57:56 +00:00 committed by David S. Miller
parent e9008ee99c
commit b30f8bdcfa
2 changed files with 5 additions and 0 deletions
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3
drivers/misc/eeprom/eeprom_93cx6.c
View file

@ -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.

2
include/linux/eeprom_93cx6.h
View file

@ -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;