drivers/w1/masters/ds_w1_bridge.c

   1 /*
   2  *      ds_w1_bridge.c
   3  *
   4  * Copyright (c) 2004 Evgeniy Polyakov <johnpol@2ka.mipt.ru>
   5  *
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/types.h>
  24
  25 #include "../w1.h"
  26 #include "../w1_int.h"
  27 #include "dscore.h"
  28
  29 static struct ds_device *ds_dev;
  30 static struct w1_bus_master *ds_bus_master;
  31
  32 static u8 ds9490r_touch_bit(void *data, u8 bit)
  33 {
  34         u8 ret;
  35         struct ds_device *dev = data;
  36
  37         if (ds_touch_bit(dev, bit, &ret))
  38                 return 0;
  39
  40         return ret;
  41 }
  42
  43 static void ds9490r_write_bit(void *data, u8 bit)
  44 {
  45         struct ds_device *dev = data;
  46
  47         ds_write_bit(dev, bit);
  48 }
  49
  50 static void ds9490r_write_byte(void *data, u8 byte)
  51 {
  52         struct ds_device *dev = data;
  53
  54         ds_write_byte(dev, byte);
  55 }
  56
  57 static u8 ds9490r_read_bit(void *data)
  58 {
  59         struct ds_device *dev = data;
  60         int err;
  61         u8 bit = 0;
  62
  63         err = ds_touch_bit(dev, 1, &bit);
  64         if (err)
  65                 return 0;
  66         //err = ds_read_bit(dev, &bit);
  67         //if (err)
  68         //      return 0;
  69
  70         return bit & 1;
  71 }
  72
  73 static u8 ds9490r_read_byte(void *data)
  74 {
  75         struct ds_device *dev = data;
  76         int err;
  77         u8 byte = 0;
  78
  79         err = ds_read_byte(dev, &byte);
  80         if (err)
  81                 return 0;
  82
  83         return byte;
  84 }
  85
  86 static void ds9490r_write_block(void *data, const u8 *buf, int len)
  87 {
  88         struct ds_device *dev = data;
  89
  90         ds_write_block(dev, (u8 *)buf, len);
  91 }
  92
  93 static u8 ds9490r_read_block(void *data, u8 *buf, int len)
  94 {
  95         struct ds_device *dev = data;
  96         int err;
  97
  98         err = ds_read_block(dev, buf, len);
  99         if (err < 0)
 100                 return 0;
 101
 102         return len;
 103 }
 104
 105 static u8 ds9490r_reset(void *data)
 106 {
 107         struct ds_device *dev = data;
 108         struct ds_status st;
 109         int err;
 110
 111         memset(&st, 0, sizeof(st));
 112
 113         err = ds_reset(dev, &st);
 114         if (err)
 115                 return 1;
 116
 117         return 0;
 118 }
 119
 120 static int __devinit ds_w1_init(void)
 121 {
 122         int err;
 123
 124         ds_bus_master = kmalloc(sizeof(*ds_bus_master), GFP_KERNEL);
 125         if (!ds_bus_master) {
 126                 printk(KERN_ERR "Failed to allocate DS9490R USB<->W1 bus_master structure.\n");
 127                 return -ENOMEM;
 128         }
 129
 130         ds_dev = ds_get_device();
 131         if (!ds_dev) {
 132                 printk(KERN_ERR "DS9490R is not registered.\n");
 133                 err =  -ENODEV;
 134                 goto err_out_free_bus_master;
 135         }
 136
 137         memset(ds_bus_master, 0, sizeof(*ds_bus_master));
 138
 139         ds_bus_master->data             = ds_dev;
 140         ds_bus_master->touch_bit        = &ds9490r_touch_bit;
 141         ds_bus_master->read_bit         = &ds9490r_read_bit;
 142         ds_bus_master->write_bit        = &ds9490r_write_bit;
 143         ds_bus_master->read_byte        = &ds9490r_read_byte;
 144         ds_bus_master->write_byte       = &ds9490r_write_byte;
 145         ds_bus_master->read_block       = &ds9490r_read_block;
 146         ds_bus_master->write_block      = &ds9490r_write_block;
 147         ds_bus_master->reset_bus        = &ds9490r_reset;
 148
 149         err = w1_add_master_device(ds_bus_master);
 150         if (err)
 151                 goto err_out_put_device;
 152
 153         return 0;
 154
 155 err_out_put_device:
 156         ds_put_device(ds_dev);
 157 err_out_free_bus_master:
 158         kfree(ds_bus_master);
 159
 160         return err;
 161 }
 162
 163 static void __devexit ds_w1_fini(void)
 164 {
 165         w1_remove_master_device(ds_bus_master);
 166         ds_put_device(ds_dev);
 167         kfree(ds_bus_master);
 168 }
 169
 170 module_init(ds_w1_init);
 171 module_exit(ds_w1_fini);
 172
 173 MODULE_LICENSE("GPL");
 174 MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");