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add custom GPIO-based I2C driver

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SVN-Revision: 9218
This commit is contained in:
Gabor Juhos 2007-10-09 19:23:22 +00:00
parent 27baec04a1
commit c0fb2f61f4
4 changed files with 141 additions and 0 deletions
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16
package/kernel/modules/i2c.mk
View file

@ -93,6 +93,22 @@ endef
$(eval $(call KernelPackage,i2c-gpio))
define KernelPackage/i2c-gpio-custom
SUBMENU:=$(I2C_MENU)
TITLE:=Custom GPIO-based I2C device
DEPENDS:=@TARGET_adm5120 kmod-i2c-core +kmod-i2c-gpio
KCONFIG:=CONFIG_I2C_GPIO_CUSTOM
FILES:=$(LINUX_DIR)/drivers/i2c/busses/i2c-gpio-custom.$(LINUX_KMOD_SUFFIX)
AUTOLOAD:=$(call AutoLoad,58,i2c-gpio-custom)
endef
define KernelPackage/i2c-gpio-custom/description
Kernel module for register a custom i2c-gpio platform device.
endef
$(eval $(call KernelPackage,i2c-gpio-custom))
define KernelPackage/i2c-scx200
SUBMENU:=$(I2C_MENU)
TITLE:=Geode SCx200 I2C using GPIO pins

71
target/linux/adm5120/files/drivers/i2c/busses/i2c-gpio-custom.c Normal file
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@ -0,0 +1,71 @@
/*
* Custom GPIO-based I2C driver
*
* Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/i2c-gpio.h>
#define DRV_NAME "i2c-gpio-custom"
#define DRV_DESC "Custom GPIO I2C device driver"
static unsigned int sda = CONFIG_I2C_GPIO_CUSTOM_SDA;
static unsigned int scl = CONFIG_I2C_GPIO_CUSTOM_SCL;
static int id = CONFIG_I2C_GPIO_CUSTOM_DEVICE_ID;
module_param(sda, uint, S_IRUGO);
MODULE_PARM_DESC(sda, "GPIO pin for SDA");
module_param(scl, uint, S_IRUGO);
MODULE_PARM_DESC(scl, "GPIO pin for SCL");
module_param(id, int, S_IRUGO);
MODULE_PARM_DESC(id, "device id of the i2c-gpio device");
static struct i2c_gpio_platform_data i2c_data;
static struct platform_device i2c_device;
static void i2c_gpio_custom_release(struct platform_device *pdev)
{
/* nothing to do */
}
static int __init i2c_gpio_custom_init(void)
{
int err;
i2c_data.sda_pin = sda;
i2c_data.scl_pin = scl;
i2c_device.name = "i2c-gpio";
i2c_device.id = id;
i2c_device.dev.platform_data = &i2c_data,
i2c_device.dev.release = i2c_gpio_custom_release,
err = platform_device_register(&i2c_device);
return err;
}
static void __exit i2c_gpio_custom_exit(void)
{
platform_device_unregister(&i2c_device);
}
module_init(i2c_gpio_custom_init);
module_exit(i2c_gpio_custom_exit);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org >");
MODULE_DESCRIPTION(DRV_DESC);

53
target/linux/adm5120/patches-2.6.22/300-i2c_gpio_custom.patch Normal file
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@ -0,0 +1,53 @@
--- linux-2.6.22.4.orig/drivers/i2c/busses/Kconfig 2007-08-21 06:33:06.000000000 +0200
+++ linux-2.6.22.4/drivers/i2c/busses/Kconfig 2007-10-09 12:53:13.000000000 +0200
@@ -125,6 +125,40 @@
This is a very simple bitbanging I2C driver utilizing the
arch-neutral GPIO API to control the SCL and SDA lines.
+config I2C_GPIO_CUSTOM
+ tristate "Custom GPIO-based I2C device"
+ depends on GENERIC_GPIO
+ select I2C_GPIO
+ help
+ This is an I2C driver to register a custom i2c-gpio device.
+
+ This support is also available as a module. If so, the module
+ will be called i2c-gpio-dev.
+
+config I2C_GPIO_CUSTOM_SDA
+ int "Custom GPIO pin for SDA"
+ depends on I2C_GPIO_CUSTOM
+ default "0"
+ help
+ Enter the GPIO pin number used for the SDA signal. This value can
+ also be specified with a module parameter.
+
+config I2C_GPIO_CUSTOM_SCL
+ int "Custom GPIO pin for SCL"
+ depends on I2C_GPIO_CUSTOM
+ default "1"
+ help
+ Enter the GPIO pin number used for the SCL signal. This value can
+ also be specified with a module parameter.
+
+config I2C_GPIO_CUSTOM_DEVICE_ID
+ int "Custom GPIO device id"
+ depends on I2C_GPIO_CUSTOM
+ default "0"
+ help
+ Enter the number used for the device id of the custom i2c-gpio device.
+ This value can also be specified with a module parameter.
+
config I2C_HYDRA
tristate "CHRP Apple Hydra Mac I/O I2C interface"
depends on PCI && PPC_CHRP && EXPERIMENTAL
--- linux-2.6.22.4.orig/drivers/i2c/busses/Makefile 2007-08-21 06:33:06.000000000 +0200
+++ linux-2.6.22.4/drivers/i2c/busses/Makefile 2007-10-09 12:07:45.000000000 +0200
@@ -13,6 +13,7 @@
obj-$(CONFIG_I2C_BLACKFIN_TWI) += i2c-bfin-twi.o
obj-$(CONFIG_I2C_ELEKTOR) += i2c-elektor.o
obj-$(CONFIG_I2C_GPIO) += i2c-gpio.o
+obj-$(CONFIG_I2C_GPIO_CUSTOM) += i2c-gpio-custom.o
obj-$(CONFIG_I2C_HYDRA) += i2c-hydra.o
obj-$(CONFIG_I2C_I801) += i2c-i801.o
obj-$(CONFIG_I2C_I810) += i2c-i810.o

1
target/linux/generic-2.6/config-2.6.22
View file

@ -387,6 +387,7 @@ CONFIG_HZ_100=y
# CONFIG_I2C_DEBUG_CORE is not set
# CONFIG_I2C_ELEKTOR is not set
# CONFIG_I2C_GPIO is not set
# CONFIG_I2C_GPIO_CUSTOM is not set
# CONFIG_I2C_I801 is not set
# CONFIG_I2C_I810 is not set
# CONFIG_I2C_NFORCE2 is not set