From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Boyd Subject: [PATCH 1/5] eeprom_93cx6: Add data direction control. Date: Wed, 26 Oct 2011 19:17:46 -0700 Message-ID: <1319681870-11972-2-git-send-email-sboyd@codeaurora.org> References: <1319681870-11972-1-git-send-email-sboyd@codeaurora.org> Cc: linux-kernel@vger.kernel.org, Sebastien Jan , netdev@vger.kernel.org, Wolfram Sang , Jean Delvare To: Ben Dooks Return-path: In-Reply-To: <1319681870-11972-1-git-send-email-sboyd@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org From: Ben Dooks 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 Signed-off-by: Stephen Boyd --- drivers/misc/eeprom/eeprom_93cx6.c | 3 +++ include/linux/eeprom_93cx6.h | 2 ++ 2 files changed, 5 insertions(+), 0 deletions(-) diff --git a/drivers/misc/eeprom/eeprom_93cx6.c b/drivers/misc/eeprom/eeprom_93cx6.c index 7b33de9..a6037af 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 c4627cb..e04546e 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; -- Sent by an employee of the Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.