target/linux/ixp4xx/patches-2.6.23/294-eeprom_new_notifier.patch

   1 diff -uprN linux-2.6.23.orig/drivers/i2c/chips/eeprom.c linux-2.6.23/drivers/i2c/chips/eeprom.c
   2 --- linux-2.6.23.orig/drivers/i2c/chips/eeprom.c        2007-10-09 15:31:38.000000000 -0500
   3 +++ linux-2.6.23/drivers/i2c/chips/eeprom.c     2007-10-11 00:57:25.000000000 -0500
   4 @@ -33,6 +33,8 @@
   5  #include <linux/jiffies.h>
   6  #include <linux/i2c.h>
   7  #include <linux/mutex.h>
   8 +#include <linux/notifier.h>
   9 +#include <linux/eeprom.h>
  10
  11  /* Addresses to scan */
  12  static unsigned short normal_i2c[] = { 0x50, 0x51, 0x52, 0x53, 0x54,
  13 @@ -41,26 +43,7 @@ static unsigned short normal_i2c[] = { 0
  14  /* Insmod parameters */
  15  I2C_CLIENT_INSMOD_1(eeprom);
  16
  17 -
  18 -/* Size of EEPROM in bytes */
  19 -#define EEPROM_SIZE            256
  20 -
  21 -/* possible types of eeprom devices */
  22 -enum eeprom_nature {
  23 -       UNKNOWN,
  24 -       VAIO,
  25 -};
  26 -
  27 -/* Each client has this additional data */
  28 -struct eeprom_data {
  29 -       struct i2c_client client;
  30 -       struct mutex update_lock;
  31 -       u8 valid;                       /* bitfield, bit!=0 if slice is valid */
  32 -       unsigned long last_updated[8];  /* In jiffies, 8 slices */
  33 -       u8 data[EEPROM_SIZE];           /* Register values */
  34 -       enum eeprom_nature nature;
  35 -};
  36 -
  37 +ATOMIC_NOTIFIER_HEAD(eeprom_chain);
  38
  39  static int eeprom_attach_adapter(struct i2c_adapter *adapter);
  40  static int eeprom_detect(struct i2c_adapter *adapter, int address, int kind);
  41 @@ -191,6 +174,7 @@ static int eeprom_detect(struct i2c_adap
  42         data->valid = 0;
  43         mutex_init(&data->update_lock);
  44         data->nature = UNKNOWN;
  45 +       data->attr = &eeprom_attr;
  46
  47         /* Tell the I2C layer a new client has arrived */
  48         if ((err = i2c_attach_client(new_client)))
  49 @@ -214,6 +198,9 @@ static int eeprom_detect(struct i2c_adap
  50         if (err)
  51                 goto exit_detach;
  52
  53 +       /* call the notifier chain */
  54 +       atomic_notifier_call_chain(&eeprom_chain, EEPROM_REGISTER, data);
  55 +
  56         return 0;
  57
  58  exit_detach:
  59 @@ -239,6 +226,41 @@ static int eeprom_detach_client(struct i
  60         return 0;
  61  }
  62
  63 +/**
  64 + * register_eeprom_notifier - register a 'user' of EEPROM devices.
  65 + * @nb: pointer to notifier info structure
  66 + *
  67 + * Registers a callback function to be called upon detection
  68 + * of an EEPROM device.  Detection invokes the 'add' callback
  69 + * with the kobj of the mutex and a bin_attribute which allows
  70 + * read from the EEPROM.  The intention is that the notifier
  71 + * will be able to read system configuration from the notifier.
  72 + *
  73 + * Only EEPROMs detected *after* the addition of the notifier
  74 + * are notified.  I.e. EEPROMs already known to the system
  75 + * will not be notified - add the notifier from board level
  76 + * code!
  77 + */
  78 +int register_eeprom_notifier(struct notifier_block *nb)
  79 +{
  80 +       return atomic_notifier_chain_register(&eeprom_chain, nb);
  81 +}
  82 +
  83 +/**
  84 + *     unregister_eeprom_notifier - unregister a 'user' of EEPROM devices.
  85 + *     @old: pointer to notifier info structure
  86 + *
  87 + *     Removes a callback function from the list of 'users' to be
  88 + *     notified upon detection of EEPROM devices.
  89 + */
  90 +int unregister_eeprom_notifier(struct notifier_block *nb)
  91 +{
  92 +       return atomic_notifier_chain_unregister(&eeprom_chain, nb);
  93 +}
  94 +
  95 +EXPORT_SYMBOL_GPL(register_eeprom_notifier);
  96 +EXPORT_SYMBOL_GPL(unregister_eeprom_notifier);
  97 +
  98  static int __init eeprom_init(void)
  99  {
 100         return i2c_add_driver(&eeprom_driver);
 101 diff -uprN linux-2.6.23.orig/include/linux/eeprom.h linux-2.6.23/include/linux/eeprom.h
 102 --- linux-2.6.23.orig/include/linux/eeprom.h    1969-12-31 18:00:00.000000000 -0600
 103 +++ linux-2.6.23/include/linux/eeprom.h 2007-10-11 00:57:25.000000000 -0500
 104 @@ -0,0 +1,71 @@
 105 +#ifndef _LINUX_EEPROM_H
 106 +#define _LINUX_EEPROM_H
 107 +/*
 108 + *  EEPROM notifier header
 109 + *
 110 + *  Copyright (C) 2006 John Bowler
 111 + */
 112 +
 113 +/*
 114 + * This program is free software; you can redistribute it and/or modify
 115 + * it under the terms of the GNU General Public License as published by
 116 + * the Free Software Foundation; either version 2 of the License, or
 117 + * (at your option) any later version.
 118 + *
 119 + * This program is distributed in the hope that it will be useful,
 120 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
 121 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 122 + * GNU General Public License for more details.
 123 + *
 124 + * You should have received a copy of the GNU General Public License
 125 + * along with this program; if not, write to the Free Software
 126 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 127 + */
 128 +
 129 +#ifndef __KERNEL__
 130 +#error This is a kernel header
 131 +#endif
 132 +
 133 +#include <linux/list.h>
 134 +#include <linux/kobject.h>
 135 +#include <linux/sysfs.h>
 136 +
 137 +/* Size of EEPROM in bytes */
 138 +#define EEPROM_SIZE             256
 139 +
 140 +/* possible types of eeprom devices */
 141 +enum eeprom_nature {
 142 +       UNKNOWN,
 143 +       VAIO,
 144 +};
 145 +
 146 +/* Each client has this additional data */
 147 +struct eeprom_data {
 148 +       struct i2c_client client;
 149 +       struct mutex update_lock;
 150 +       u8 valid;                       /* bitfield, bit!=0 if slice is valid */
 151 +       unsigned long last_updated[8];  /* In jiffies, 8 slices */
 152 +       u8 data[EEPROM_SIZE];           /* Register values */
 153 +       enum eeprom_nature nature;
 154 +       struct bin_attribute *attr;
 155 +};
 156 +
 157 +/*
 158 + * This is very basic.
 159 + *
 160 + * If an EEPROM is detected on the I2C bus (this only works for
 161 + * I2C EEPROMs) the notifier chain  is called with
 162 + * both the I2C information and the kobject for the sysfs
 163 + * device which has been registers.  It is then possible to
 164 + * read from the device via the bin_attribute::read method
 165 + * to extract configuration information.
 166 + *
 167 + * Register the notifier in the board level code, there is no
 168 + * need to unregister it but you can if you want (it will save
 169 + * a little bit or kernel memory to do so).
 170 + */
 171 +
 172 +extern int register_eeprom_notifier(struct notifier_block *nb);
 173 +extern int unregister_eeprom_notifier(struct notifier_block *nb);
 174 +
 175 +#endif /* _LINUX_EEPROM_H */
 176 diff -uprN linux-2.6.23.orig/include/linux/notifier.h linux-2.6.23/include/linux/notifier.h
 177 --- linux-2.6.23.orig/include/linux/notifier.h  2007-10-09 15:31:38.000000000 -0500
 178 +++ linux-2.6.23/include/linux/notifier.h       2007-10-11 00:57:25.000000000 -0500
 179 @@ -231,5 +231,8 @@ static inline int notifier_to_errno(int
 180  #define PM_SUSPEND_PREPARE     0x0003 /* Going to suspend the system */
 181  #define PM_POST_SUSPEND                0x0004 /* Suspend finished */
 182
 183 +/* eeprom notifier chain */
 184 +#define EEPROM_REGISTER                0x0001
 185 +
 186  #endif /* __KERNEL__ */
 187  #endif /* _LINUX_NOTIFIER_H */