--- /dev/null
+diff -urN linux-2.6.19/drivers/i2c/busses/Kconfig linux-2.6.19.new/drivers/i2c/busses/Kconfig
+--- linux-2.6.19/drivers/i2c/busses/Kconfig 2006-11-29 22:57:37.000000000 +0100
++++ linux-2.6.19.new/drivers/i2c/busses/Kconfig 2006-12-28 17:04:34.000000000 +0100
+@@ -84,6 +84,16 @@
+ This driver can also be built as a module. If so, the module
+ will be called i2c-au1550.
+
++config I2C_AU1X00GPIO
++ tristate "Au1x00 i2c using GPIO pins"
++ depends on I2C && MTX1
++ help
++ If you say yest to this option, support will be included for the
++ Au1x00 GPIO interface.
++
++ This driver can also be built as a module. If so, the module
++ will be called i2c-au1x00gpio.
++
+ config I2C_ELEKTOR
+ tristate "Elektor ISA card"
+ depends on I2C && ISA && BROKEN_ON_SMP
+diff -urN linux-2.6.19/drivers/i2c/busses/Makefile linux-2.6.19.new/drivers/i2c/busses/Makefile
+--- linux-2.6.19/drivers/i2c/busses/Makefile 2006-11-29 22:57:37.000000000 +0100
++++ linux-2.6.19.new/drivers/i2c/busses/Makefile 2006-12-28 03:07:37.000000000 +0100
+@@ -9,6 +9,7 @@
+ obj-$(CONFIG_I2C_AMD756_S4882) += i2c-amd756-s4882.o
+ obj-$(CONFIG_I2C_AMD8111) += i2c-amd8111.o
+ obj-$(CONFIG_I2C_AU1550) += i2c-au1550.o
++obj-$(CONFIG_I2C_AU1X00GPIO) += i2c-au1x00gpio.o
+ obj-$(CONFIG_I2C_ELEKTOR) += i2c-elektor.o
+ obj-$(CONFIG_I2C_HYDRA) += i2c-hydra.o
+ obj-$(CONFIG_I2C_I801) += i2c-i801.o
+diff -urN linux-2.6.19/drivers/i2c/busses/i2c-au1x00gpio.c linux-2.6.19.new/drivers/i2c/busses/i2c-au1x00gpio.c
+--- linux-2.6.19/drivers/i2c/busses/i2c-au1x00gpio.c 1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.19.new/drivers/i2c/busses/i2c-au1x00gpio.c 2006-12-28 17:02:10.000000000 +0100
+@@ -0,0 +1,421 @@
++/* ------------------------------------------------------------------------- */
++/* i2c-au1x00gpio.c i2c-hw access for Au1x00 GPIO pins. */
++/* ------------------------------------------------------------------------- */
++/* Copyright (C) 1995-2000 Michael Stickel
++
++ This program is free software; you can redistribute it and/or modify
++ it under the terms of the GNU General Public License as published by
++ the Free Software Foundation; either version 2 of the License, or
++ (at your option) any later version.
++
++ This program is distributed in the hope that it will be useful,
++ but WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ GNU General Public License for more details.
++
++ You should have received a copy of the GNU General Public License
++ along with this program; if not, write to the Free Software
++ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
++/* ------------------------------------------------------------------------- */
++
++/* With some changes from Ky�stialkki <kmalkki@cc.hut.fi> and even
++ Frodo Looijaard <frodol@dds.nl>
++ Simon G. Vogl
++*/
++
++/* $Id: i2c-au1x00gpio.c,v 1.1.1.2 2004/01/22 15:35:47 br1 Exp $ */
++
++#include <linux/module.h>
++#include <linux/types.h>
++#include <linux/kernel.h>
++#include <linux/init.h>
++#include <linux/stddef.h>
++#include <linux/ioport.h>
++#include <asm/uaccess.h>
++#include <asm/io.h>
++#include <asm-mips/mach-au1x00/au1000.h>
++#include <asm-mips/mach-au1x00/au1000_gpio.h>
++
++#include <linux/slab.h>
++#include <linux/mm.h>
++
++#include <linux/i2c.h>
++#include <linux/i2c-algo-bit.h>
++
++#ifndef __exit
++#define __exit __init
++#endif
++
++
++struct i2c_au1x00gpio
++{
++ struct i2c_au1x00gpio *next;
++
++ short scl_gpio;
++ short sda_gpio;
++
++ unsigned long scl_mask;
++ unsigned long sda_mask;
++
++ struct i2c_adapter adapter;
++ struct i2c_algo_bit_data bit_au1x00gpio_data;
++};
++
++static struct i2c_au1x00gpio *adapter_list;
++
++
++
++/* ----- global defines ----------------------------------------------- */
++#define DEB(x) /* should be reasonable open, close &c. */
++#define DEB2(x) /* low level debugging - very slow */
++#define DEBE(x) x /* error messages */
++
++/* ----- printer port defines ------------------------------------------*/
++
++/* ----- local functions ---------------------------------------------- */
++
++
++//-- Primary GPIO
++static void bit_au1x00gpio_setscl(void *data, int state)
++{
++ struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
++ if (state)
++ au_writel(adapter->scl_mask, SYS_TRIOUTCLR); // Disable Driver: Switch off Transistor => 1
++ else
++ au_writel(adapter->scl_mask, SYS_OUTPUTCLR); // Clear Output and switch on Transistor => 0
++}
++
++
++static void bit_au1x00gpio_setsda(void *data, int state)
++{
++ struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
++ if (state)
++ au_writel(adapter->sda_mask, SYS_TRIOUTCLR);
++ else
++ au_writel(adapter->sda_mask, SYS_OUTPUTCLR);
++}
++
++
++static int bit_au1x00gpio_getscl(void *data)
++{
++ struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
++ return (au_readl(SYS_PINSTATERD) & adapter->scl_mask) ? 1 : 0;
++}
++
++
++static int bit_au1x00gpio_getsda(void *data)
++{
++ struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
++ return (au_readl(SYS_PINSTATERD) & adapter->sda_mask) ? 1 : 0;
++}
++
++
++
++
++/*--
++ *-- Functions for accessing GPIO-2
++ *--
++ */
++static void bit_au1x00gpio2_setscl(void *data, int state)
++{
++ struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
++ if (state)
++ {
++ au_writel(au_readl(GPIO2_DIR) & ~adapter->scl_mask, GPIO2_DIR);
++ }
++ else
++ {
++ au_writel(au_readl(GPIO2_OUTPUT) & ~adapter->scl_mask, GPIO2_OUTPUT);
++ au_writel(au_readl(GPIO2_DIR) | adapter->scl_mask, GPIO2_DIR);
++ }
++}
++
++static void bit_au1x00gpio2_setsda(void *data, int state)
++{
++ struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
++ if (state)
++ {
++ au_writel(au_readl(GPIO2_DIR) & ~adapter->sda_mask, GPIO2_DIR);
++ }
++ else
++ {
++ au_writel(au_readl(GPIO2_OUTPUT) & ~adapter->sda_mask, GPIO2_OUTPUT);
++ au_writel(au_readl(GPIO2_DIR) | adapter->sda_mask, GPIO2_DIR);
++ }
++}
++
++static int bit_au1x00gpio2_getscl(void *data)
++{
++ struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
++ return (au_readl(GPIO2_PINSTATE) & adapter->scl_mask) ? 1 : 0;
++}
++
++static int bit_au1x00gpio2_getsda(void *data)
++{
++ struct i2c_au1x00gpio * adapter = (struct i2c_au1x00gpio *)data;
++ return (au_readl(GPIO2_PINSTATE) & adapter->sda_mask) ? 1 : 0;
++}
++
++
++
++static int check_i2c_au1x00gpio_adapter(struct i2c_au1x00gpio *adapter)
++{
++ int state = 0;
++
++ adapter->bit_au1x00gpio_data.setsda (adapter, 1);
++ adapter->bit_au1x00gpio_data.setscl (adapter, 1);
++
++ if (adapter->bit_au1x00gpio_data.getsda(adapter)==0)
++ {
++ printk ("i2c-au1x00gpio: sda line should read 1 but reads 0\n");
++ state = -1;
++ }
++ if (adapter->bit_au1x00gpio_data.getscl(adapter)==0)
++ {
++ printk ("i2c-au1x00gpio: scl line should read 1 but reads 0\n");
++ state = -1;
++ }
++
++
++ adapter->bit_au1x00gpio_data.setsda (adapter, 0);
++ adapter->bit_au1x00gpio_data.setscl (adapter, 0);
++
++ if (adapter->bit_au1x00gpio_data.getsda(adapter)==1)
++ {
++ printk ("i2c-au1x00gpio: sda line should read 0 but reads 1\n");
++ state = -1;
++ }
++ if (adapter->bit_au1x00gpio_data.getscl(adapter)==1)
++ {
++ printk ("i2c-au1x00gpio: scl line should read 0 but reads 1\n");
++ state = -1;
++ }
++
++ if (state==0)
++ printk ("i2c-au1x00gpio: adapter with scl=GPIO%d,sda=GPIO%d is working\n",
++ adapter->scl_gpio, adapter->sda_gpio
++ );
++ return state;
++}
++
++
++
++#if 0
++static int bit_au1x00gpio_reg(struct i2c_client *client)
++{
++ return 0;
++}
++
++static int bit_au1x00gpio_unreg(struct i2c_client *client)
++{
++ return 0;
++}
++
++static void bit_au1x00gpio_inc_use(struct i2c_adapter *adap)
++{
++ MOD_INC_USE_COUNT;
++}
++
++static void bit_au1x00gpio_dec_use(struct i2c_adapter *adap)
++{
++ MOD_DEC_USE_COUNT;
++}
++#endif
++
++
++
++static struct i2c_algo_bit_data bit_au1x00gpio_data = {
++ .data = NULL,
++ .setsda = bit_au1x00gpio_setsda,
++ .setscl = bit_au1x00gpio_setscl,
++ .getsda = bit_au1x00gpio_getsda,
++ .getscl = bit_au1x00gpio_getscl,
++ .udelay = 80,
++ .timeout = HZ,
++};
++
++
++static struct i2c_adapter bit_au1x00gpio_ops = {
++ .owner = THIS_MODULE,
++ .name = "Au1x00 GPIO I2C adapter",
++ .id = I2C_HW_B_AU1x00GPIO,
++};
++
++
++
++/*
++ * scl_gpio:
++ * 0..31 for primary GPIO's
++ * 200..215 for secondary GPIO's
++ *
++ * sda_gpio:
++ * 0..31 for primary GPIO's
++ * 200..215 for secondary GPIO's
++ *
++ * You can even mix primary and secondary GPIO's.
++ * E.g.: i2c_au1x00gpio_create(4,206);
++ */
++
++static int i2c_au1x00gpio_create (int scl_gpio, int sda_gpio)
++{
++ if ((scl_gpio < 32 || (scl_gpio >= 200 && scl_gpio <= 215)) &&
++ (scl_gpio < 32 || (scl_gpio >= 200 && scl_gpio <= 215)))
++ {
++ struct i2c_au1x00gpio *adapter = kmalloc(sizeof(struct i2c_au1x00gpio),
++ GFP_KERNEL);
++ if (!adapter) {
++ printk(KERN_ERR "i2c-au1x00-gpio: Unable to malloc.\n");
++ return -1;
++ }
++
++ printk(KERN_DEBUG "i2c-au1x00-gpio.o: attaching to SCL=GPIO%d, SDA=GPIO%d\n",
++ scl_gpio, sda_gpio);
++
++ memset (adapter, 0, sizeof(struct i2c_au1x00gpio));
++
++ adapter->adapter = bit_au1x00gpio_ops;
++
++ adapter->adapter.algo_data = &adapter->bit_au1x00gpio_data;
++ adapter->bit_au1x00gpio_data = bit_au1x00gpio_data;
++ adapter->bit_au1x00gpio_data.data = adapter;
++
++ adapter->bit_au1x00gpio_data.data = adapter;
++
++ adapter->scl_gpio = scl_gpio;
++ adapter->sda_gpio = sda_gpio;
++
++ if (sda_gpio < 32)
++ {
++ adapter->bit_au1x00gpio_data.setsda = bit_au1x00gpio_setsda;
++ adapter->bit_au1x00gpio_data.getsda = bit_au1x00gpio_getsda;
++ adapter->sda_mask = 1<<sda_gpio;
++ }
++ else if (sda_gpio >= 200 && sda_gpio <= 215)
++ {
++ adapter->bit_au1x00gpio_data.setsda = bit_au1x00gpio2_setsda;
++ adapter->bit_au1x00gpio_data.getsda = bit_au1x00gpio2_getsda;
++ adapter->sda_mask = 1<<(sda_gpio-200);
++ }
++
++
++ if (scl_gpio < 32)
++ {
++ adapter->bit_au1x00gpio_data.setscl = bit_au1x00gpio_setscl;
++ adapter->bit_au1x00gpio_data.getscl = bit_au1x00gpio_getscl;
++ adapter->scl_mask = 1<<scl_gpio;
++ }
++ else if (scl_gpio >= 200 && scl_gpio <= 215)
++ {
++ adapter->bit_au1x00gpio_data.setscl = bit_au1x00gpio2_setscl;
++ adapter->bit_au1x00gpio_data.getscl = bit_au1x00gpio2_getscl;
++ adapter->scl_mask = 1<<(scl_gpio-200);
++ }
++
++ au_writel(0L, SYS_PININPUTEN);
++ if (check_i2c_au1x00gpio_adapter(adapter)==0)
++ {
++ adapter->bit_au1x00gpio_data.setsda (adapter, 1);
++ adapter->bit_au1x00gpio_data.setscl (adapter, 1);
++
++ if (i2c_bit_add_bus(&adapter->adapter) < 0)
++ {
++ printk(KERN_ERR "i2c-au1x00-gpio: Unable to register with I2C.\n");
++ kfree(adapter);
++ return -1; /* No good */
++ }
++
++ adapter->next = adapter_list;
++ adapter_list = adapter;
++ return 0;
++ }
++ }
++ else
++ printk(KERN_ERR "i2c-au1x00-gpio: Invalid argument scl_gpio=%d, sda_gpio=%d.\n", scl_gpio, sda_gpio);
++ return -1;
++}
++
++
++
++static void i2c_au1x00gpio_delete (int scl_gpio, int sda_gpio)
++{
++ struct i2c_au1x00gpio *adapter, *prev = NULL;
++
++ for (adapter = adapter_list; adapter; adapter = adapter->next)
++ {
++ if (adapter->scl_gpio == scl_gpio &&
++ adapter->sda_gpio == sda_gpio)
++ {
++ i2c_bit_del_bus(&adapter->adapter);
++ if (prev)
++ prev->next = adapter->next;
++ else
++ adapter_list = adapter->next;
++ kfree(adapter);
++ return;
++ }
++ prev = adapter;
++ }
++}
++
++
++
++
++
++#ifndef CONFIG_I2C_AU1X00GPIO_SCL
++#define CONFIG_I2C_AU1X00GPIO_SCL (216)
++#endif
++
++#ifndef CONFIG_I2C_AU1X00GPIO_SDA
++#define CONFIG_I2C_AU1X00GPIO_SDA (217)
++#endif
++
++static int au1x00gpiopin_scl = CONFIG_I2C_AU1X00GPIO_SCL;
++static int au1x00gpiopin_sda = CONFIG_I2C_AU1X00GPIO_SDA;
++
++
++
++int __init i2c_bit_au1x00gpio_init(void)
++{
++ printk(KERN_INFO "i2c-au1x00gpio.o: i2c Au1x00 GPIO adapter module version\n");
++
++ if (i2c_au1x00gpio_create (au1x00gpiopin_scl, au1x00gpiopin_sda) == 0)
++ {
++ printk(KERN_INFO "i2c-au1x00gpio.o: registered I2C-Bus for GPIO%d,GPIO%d\n",
++ au1x00gpiopin_scl, au1x00gpiopin_sda
++ );
++ return 0;
++ }
++ printk(KERN_INFO "i2c-au1x00gpio.o: failed to register I2C-Bus for GPIO%d,GPIO%d\n",
++ au1x00gpiopin_scl, au1x00gpiopin_sda
++ );
++ return -1;
++}
++
++
++void __exit i2c_bit_au1x00gpio_exit(void)
++{
++ i2c_au1x00gpio_delete (au1x00gpiopin_scl, au1x00gpiopin_sda);
++}
++
++module_param(au1x00gpiopin_scl, int, 0644);
++MODULE_PARM_DESC(au1x00gpiopin_scl, "GPIO pin number used for SCL pin.");
++
++module_param(au1x00gpiopin_sda, int, 0644);
++MODULE_PARM_DESC(au1x00gpiopin_sda, "GPIO pin number used for SDA pin.");
++
++MODULE_AUTHOR("Michael Stickel <michael@cubic.org>");
++MODULE_DESCRIPTION("I2C-Bus adapter routines for Au1x00 GPIO adapter.");
++MODULE_LICENSE("GPL");
++
++
++#ifdef MODULE
++int init_module(void)
++{
++ return i2c_bit_au1x00gpio_init();
++}
++
++void cleanup_module(void)
++{
++ i2c_bit_au1x00gpio_exit();
++}
++#endif
projects / openwrt / openwrt.git / blobdiff