Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757114Ab1EXQDK (ORCPT ); Tue, 24 May 2011 12:03:10 -0400 Received: from mail-out.m-online.net ([212.18.0.9]:57540 "EHLO mail-out.m-online.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932268Ab1EXQDG (ORCPT ); Tue, 24 May 2011 12:03:06 -0400 X-Auth-Info: 1iBqXMm8nKfA8NafEyYEfjNk1xmN2s8aBtw02qMnXSw= From: Anatolij Gustschin To: linux-kernel@vger.kernel.org Cc: akpm@linux-foundation.org, dzu@denx.de, Anatolij Gustschin Subject: [PATCH 2/2] misc/eeprom: add eeprom access driver for digsy_mtc board Date: Tue, 24 May 2011 18:02:43 +0200 Message-Id: <1306252963-20746-2-git-send-email-agust@denx.de> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1306252963-20746-1-git-send-email-agust@denx.de> References: <1306252963-20746-1-git-send-email-agust@denx.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4127 Lines: 138 Both displays on digsy_mtc board obtain their configuration from MicroWire EEPROMs which are connected to the SoC over GPIO lines. We need an easy way to access the EEPROMs to write the needed display configuration or to read out the currently programmed configuration. The generic gpio-93xx46 driver added by previous patch allows EEPROM access over sysfs. Using the simple driver added by this patch we provide used GPIO interface and access control description on the board for generic gpio-93xx46 driver. Signed-off-by: Anatolij Gustschin --- drivers/misc/eeprom/Kconfig | 13 ++++++ drivers/misc/eeprom/Makefile | 1 + drivers/misc/eeprom/digsy_mtc_eeprom.c | 75 ++++++++++++++++++++++++++++++++ 3 files changed, 89 insertions(+), 0 deletions(-) create mode 100644 drivers/misc/eeprom/digsy_mtc_eeprom.c diff --git a/drivers/misc/eeprom/Kconfig b/drivers/misc/eeprom/Kconfig index fcceffd..b74b402 100644 --- a/drivers/misc/eeprom/Kconfig +++ b/drivers/misc/eeprom/Kconfig @@ -80,4 +80,17 @@ config EEPROM_GPIO_93XX46 If unsure, say N. +config DIGSY_MTC_CFG_EEPROM + tristate "DigsyMTC display configuration EEPROMs device" + depends on PPC_MPC5200_GPIO + select EEPROM_GPIO_93XX46 + help + This option enables access to display configuration EEPROMs on + digsy_mtc board. sysfs entries will be created for that EEPROM + allowing to read/write the configuration data or to erase the + whole EEPROM. + + To compile this driver as a module, choose M here: the + module will be called digsy_mtc_eeprom. + endmenu diff --git a/drivers/misc/eeprom/Makefile b/drivers/misc/eeprom/Makefile index 38d8259..cbbb282 100644 --- a/drivers/misc/eeprom/Makefile +++ b/drivers/misc/eeprom/Makefile @@ -4,3 +4,4 @@ obj-$(CONFIG_EEPROM_LEGACY) += eeprom.o obj-$(CONFIG_EEPROM_MAX6875) += max6875.o obj-$(CONFIG_EEPROM_93CX6) += eeprom_93cx6.o obj-$(CONFIG_EEPROM_GPIO_93XX46) += gpio-93xx46.o +obj-$(CONFIG_DIGSY_MTC_CFG_EEPROM) += digsy_mtc_eeprom.o diff --git a/drivers/misc/eeprom/digsy_mtc_eeprom.c b/drivers/misc/eeprom/digsy_mtc_eeprom.c new file mode 100644 index 0000000..301d4bb --- /dev/null +++ b/drivers/misc/eeprom/digsy_mtc_eeprom.c @@ -0,0 +1,75 @@ +#include +#include +#include +#include +#include + +#define GPIO_EEPROM_OE 255 + +static void digsy_mtc_op_prepare(void *p) +{ + /* enable */ + gpio_set_value(GPIO_EEPROM_OE, 0); +} + +static void digsy_mtc_op_finish(void *p) +{ + /* disable */ + gpio_set_value(GPIO_EEPROM_OE, 1); +} + +static const struct gpio_93xx46_platform_data digsy_mtc_93xx46_gpio = { + .clk = 216, + .cs = 210, + .din = 217, + .dout = 249, + .flags = EE_ADDR8 | EE_CS_LOW, + .prepare = digsy_mtc_op_prepare, + .finish = digsy_mtc_op_finish, +}; + +struct platform_device *digsy_mtc_93xx46_device; + +static int __init digsy_mtc_93xx46_init(void) +{ + struct platform_device *pdev; + int ret; + + pdev = platform_device_alloc("gpio-93xx46", 0); + if (!pdev) + return -ENOMEM; + + ret = platform_device_add_data(pdev, &digsy_mtc_93xx46_gpio, + sizeof(digsy_mtc_93xx46_gpio)); + if (ret) + goto err; + + ret = gpio_request_one(GPIO_EEPROM_OE, GPIOF_OUT_INIT_HIGH, + "93xx46 EEPROM OE"); + if (ret) + goto err; + + ret = platform_device_add(pdev); + if (ret) + goto err; + + digsy_mtc_93xx46_device = pdev; + return 0; + +err: + platform_device_put(pdev); + return ret; +} +module_init(digsy_mtc_93xx46_init); + +static void __exit digsy_mtc_93xx46_exit(void) +{ + platform_device_unregister(digsy_mtc_93xx46_device); + digsy_mtc_93xx46_device = NULL; + gpio_free(GPIO_EEPROM_OE); +} +module_exit(digsy_mtc_93xx46_exit); + +MODULE_DESCRIPTION("DigsyMTC 93xx46 EEPROM device"); +MODULE_AUTHOR("Anatolij Gustschin "); +MODULE_LICENSE("GPL"); -- 1.7.1 -- 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/