Gabor Juhos
17 years ago
parent
27baec04a1
commit
c0fb2f61f4
@ -0,0 +1,71 @@
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/*
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* Custom GPIO-based I2C driver
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*
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* Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/i2c-gpio.h>
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#define DRV_NAME "i2c-gpio-custom"
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#define DRV_DESC "Custom GPIO I2C device driver"
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static unsigned int sda = CONFIG_I2C_GPIO_CUSTOM_SDA;
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static unsigned int scl = CONFIG_I2C_GPIO_CUSTOM_SCL;
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static int id = CONFIG_I2C_GPIO_CUSTOM_DEVICE_ID;
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module_param(sda, uint, S_IRUGO);
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MODULE_PARM_DESC(sda, "GPIO pin for SDA");
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module_param(scl, uint, S_IRUGO);
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MODULE_PARM_DESC(scl, "GPIO pin for SCL");
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module_param(id, int, S_IRUGO);
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MODULE_PARM_DESC(id, "device id of the i2c-gpio device");
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static struct i2c_gpio_platform_data i2c_data;
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static struct platform_device i2c_device;
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static void i2c_gpio_custom_release(struct platform_device *pdev)
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{
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/* nothing to do */
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}
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static int __init i2c_gpio_custom_init(void)
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{
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int err;
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i2c_data.sda_pin = sda;
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i2c_data.scl_pin = scl;
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i2c_device.name = "i2c-gpio";
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i2c_device.id = id;
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i2c_device.dev.platform_data = &i2c_data,
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i2c_device.dev.release = i2c_gpio_custom_release,
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err = platform_device_register(&i2c_device);
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return err;
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}
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static void __exit i2c_gpio_custom_exit(void)
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{
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platform_device_unregister(&i2c_device);
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}
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module_init(i2c_gpio_custom_init);
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module_exit(i2c_gpio_custom_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org >");
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MODULE_DESCRIPTION(DRV_DESC);
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@ -0,0 +1,53 @@
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--- linux-2.6.22.4.orig/drivers/i2c/busses/Kconfig 2007-08-21 06:33:06.000000000 +0200
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+++ linux-2.6.22.4/drivers/i2c/busses/Kconfig 2007-10-09 12:53:13.000000000 +0200
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@@ -125,6 +125,40 @@
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This is a very simple bitbanging I2C driver utilizing the
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arch-neutral GPIO API to control the SCL and SDA lines.
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+config I2C_GPIO_CUSTOM
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+ tristate "Custom GPIO-based I2C device"
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+ depends on GENERIC_GPIO
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+ select I2C_GPIO
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+ help
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+ This is an I2C driver to register a custom i2c-gpio device.
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+
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+ This support is also available as a module. If so, the module
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+ will be called i2c-gpio-dev.
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+
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+config I2C_GPIO_CUSTOM_SDA
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+ int "Custom GPIO pin for SDA"
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+ depends on I2C_GPIO_CUSTOM
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+ default "0"
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+ help
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+ Enter the GPIO pin number used for the SDA signal. This value can
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+ also be specified with a module parameter.
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+
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+config I2C_GPIO_CUSTOM_SCL
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+ int "Custom GPIO pin for SCL"
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+ depends on I2C_GPIO_CUSTOM
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+ default "1"
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+ help
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+ Enter the GPIO pin number used for the SCL signal. This value can
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+ also be specified with a module parameter.
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+
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+config I2C_GPIO_CUSTOM_DEVICE_ID
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+ int "Custom GPIO device id"
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+ depends on I2C_GPIO_CUSTOM
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+ default "0"
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+ help
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+ Enter the number used for the device id of the custom i2c-gpio device.
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+ This value can also be specified with a module parameter.
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+
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config I2C_HYDRA
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tristate "CHRP Apple Hydra Mac I/O I2C interface"
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depends on PCI && PPC_CHRP && EXPERIMENTAL
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--- linux-2.6.22.4.orig/drivers/i2c/busses/Makefile 2007-08-21 06:33:06.000000000 +0200
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+++ linux-2.6.22.4/drivers/i2c/busses/Makefile 2007-10-09 12:07:45.000000000 +0200
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@@ -13,6 +13,7 @@
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obj-$(CONFIG_I2C_BLACKFIN_TWI) += i2c-bfin-twi.o
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obj-$(CONFIG_I2C_ELEKTOR) += i2c-elektor.o
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obj-$(CONFIG_I2C_GPIO) += i2c-gpio.o
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+obj-$(CONFIG_I2C_GPIO_CUSTOM) += i2c-gpio-custom.o
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obj-$(CONFIG_I2C_HYDRA) += i2c-hydra.o
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obj-$(CONFIG_I2C_I801) += i2c-i801.o
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obj-$(CONFIG_I2C_I810) += i2c-i810.o
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