diff options
Diffstat (limited to 'packages/linux/ixp4xx-kernel/2.6.16/45-eeprom-notifier.patch')
| -rw-r--r-- | packages/linux/ixp4xx-kernel/2.6.16/45-eeprom-notifier.patch | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/packages/linux/ixp4xx-kernel/2.6.16/45-eeprom-notifier.patch b/packages/linux/ixp4xx-kernel/2.6.16/45-eeprom-notifier.patch new file mode 100644 index 0000000000..0367477a48 --- /dev/null +++ b/packages/linux/ixp4xx-kernel/2.6.16/45-eeprom-notifier.patch @@ -0,0 +1,184 @@ +Add EEPROM notifiers + +These help board level code by allowing a callback when EEPROMs are +loaded, this permits system level configuration to be loaded from the +EEPROM. This is particularly useful when the ethernet MAC ids are +stored in EEPROM and when the ethernet hardware is generic (so it +has no board level knowledge), then the MACs can be loaded into +the 'maclist' code and read out by the ethernet config. + +Signed-off-by: John Bowler <jbowler@acm.org> + +--- linux-2.6.15/drivers/i2c/chips/eeprom.c 1970-01-01 00:00:00.000000000 +0000 ++++ linux-2.6.15/drivers/i2c/chips/eeprom.c 1970-01-01 00:00:00.000000000 +0000 +@@ -25,7 +25,6 @@ + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ +- + #include <linux/kernel.h> + #include <linux/init.h> + #include <linux/module.h> +@@ -33,6 +32,9 @@ + #include <linux/sched.h> + #include <linux/jiffies.h> + #include <linux/i2c.h> ++#include <linux/notifier.h> ++ ++#include <linux/eeprom.h> + + /* Addresses to scan */ + static unsigned short normal_i2c[] = { 0x50, 0x51, 0x52, 0x53, 0x54, +@@ -41,6 +43,9 @@ static unsigned short normal_i2c[] = { 0 + /* Insmod parameters */ + I2C_CLIENT_INSMOD_1(eeprom); + ++/* Notifier list */ ++static DECLARE_MUTEX(eeprom_notifier_mutex); ++static LIST_HEAD(eeprom_notifiers); + + /* Size of EEPROM in bytes */ + #define EEPROM_SIZE 256 +@@ -160,6 +165,7 @@ static int eeprom_detect(struct i2c_adap + struct i2c_client *new_client; + struct eeprom_data *data; + int err = 0; ++ struct list_head *this; + + /* There are three ways we can read the EEPROM data: + (1) I2C block reads (faster, but unsupported by most adapters) +@@ -196,7 +202,7 @@ static int eeprom_detect(struct i2c_adap + + /* Detect the Vaio nature of EEPROMs. + We use the "PCG-" prefix as the signature. */ +- if (address == 0x57) { ++ if (list_empty(&eeprom_notifiers) && address == 0x57) { + if (i2c_smbus_read_byte_data(new_client, 0x80) == 'P' + && i2c_smbus_read_byte(new_client) == 'C' + && i2c_smbus_read_byte(new_client) == 'G' +@@ -210,6 +216,14 @@ static int eeprom_detect(struct i2c_adap + /* create the sysfs eeprom file */ + sysfs_create_bin_file(&new_client->dev.kobj, &eeprom_attr); + ++ /* Call each notifier callback */ ++ down(&eeprom_notifier_mutex); ++ list_for_each(this, &eeprom_notifiers) { ++ struct eeprom_notifier *not = list_entry(this, struct eeprom_notifier, list); ++ not->add(address, kind, &new_client->dev.kobj, &eeprom_attr); ++ } ++ up(&eeprom_notifier_mutex); ++ + return 0; + + exit_kfree: +@@ -231,6 +245,51 @@ static int eeprom_detach_client(struct i + return 0; + } + ++/** ++ * register_eeprom_user - register a 'user' of EEPROM devices. ++ * @new: pointer to notifier info structure ++ * ++ * Registers a callback function to be called upon detection ++ * of an EEPROM device. Detection invokes the 'add' callback ++ * with the kobj of the mutex and a bin_attribute which allows ++ * read from the EEPROM. The intention is that the notifier ++ * will be able to read system configuration from the notifier. ++ * ++ * Only EEPROMs detected *after* the addition of the notifier ++ * are notified. I.e. EEPROMs already known to the system ++ * will not be notified - add the notifier from board level ++ * code! ++ */ ++void register_eeprom_user (struct eeprom_notifier *new) ++{ ++ down(&eeprom_notifier_mutex); ++ ++ list_add(&new->list, &eeprom_notifiers); ++ ++ up(&eeprom_notifier_mutex); ++} ++ ++/** ++ * unregister_eeprom_user - unregister a 'user' of EEPROM devices. ++ * @old: pointer to notifier info structure ++ * ++ * Removes a callback function from the list of 'users' to be ++ * notified upon detection of EEPROM devices. ++ */ ++void unregister_eeprom_user (struct eeprom_notifier *old) ++{ ++ down(&eeprom_notifier_mutex); ++ ++ list_del(&old->list); ++ ++ up(&eeprom_notifier_mutex); ++} ++ ++ ++EXPORT_SYMBOL(register_eeprom_user); ++EXPORT_SYMBOL(unregister_eeprom_user); ++ ++ + static int __init eeprom_init(void) + { + return i2c_add_driver(&eeprom_driver); +--- linux-2.6.15/include/linux/eeprom.h 1970-01-01 00:00:00.000000000 +0000 ++++ linux-2.6.15/include/linux/eeprom.h 1970-01-01 00:00:00.000000000 +0000 +@@ -0,0 +1,56 @@ ++#ifndef _LINUX_EEPROM_H ++#define _LINUX_EEPROM_H ++/* ++ * $Id: 45-eeprom-notifier.patch,v 1.1 2006/02/07 00:38:33 azummo Exp $ ++ * ++ * Copyright (C) 2006 John Bowler ++ */ ++ ++/* ++ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA ++ */ ++ ++#ifndef __KERNEL__ ++#error This is a kernel header ++#endif ++ ++#include <linux/list.h> ++#include <linux/kobject.h> ++#include <linux/sysfs.h> ++ ++/* ++ * This is very basic. ++ * ++ * If an EEPROM is detected on the I2C bus (this only works for ++ * I2C EEPROMs) the eeprom_notifier::add method is called with ++ * both the I2C information and the kobject for the sysfs ++ * device which has been registers. It is then possible to ++ * read from the device via the bin_attribute::read method ++ * to extract configuration information. ++ * ++ * Register the notifier in the board level code, there is no ++ * need to unregister it but you can if you want (it will save ++ * a little bit or kernel memory to do so). ++ */ ++struct eeprom_notifier { ++ void (*add)(int address, int kind, struct kobject *kobj, ++ struct bin_attribute *eeprom_attr); ++ struct list_head list; ++}; ++ ++extern void register_eeprom_user (struct eeprom_notifier *new); ++extern void unregister_eeprom_user (struct eeprom_notifier *old); ++ ++#endif /* _LINUX_EEPROM_H */ |