tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/w1.h"
26#include "../w1/w1_int.h"
27#include "dscore.h"
28
29static struct ds_device *ds_dev;
30static struct w1_bus_master *ds_bus_master;
31
32static u8 ds9490r_touch_bit(unsigned long data, u8 bit)
33{
34 u8 ret;
35 struct ds_device *dev = (struct ds_device *)data;
36
37 if (ds_touch_bit(dev, bit, &ret))
38 return 0;
39
40 return ret;
41}
42
43static void ds9490r_write_bit(unsigned long data, u8 bit)
44{
45 struct ds_device *dev = (struct ds_device *)data;
46
47 ds_write_bit(dev, bit);
48}
49
50static void ds9490r_write_byte(unsigned long data, u8 byte)
51{
52 struct ds_device *dev = (struct ds_device *)data;
53
54 ds_write_byte(dev, byte);
55}
56
57static u8 ds9490r_read_bit(unsigned long data)
58{
59 struct ds_device *dev = (struct ds_device *)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
73static u8 ds9490r_read_byte(unsigned long data)
74{
75 struct ds_device *dev = (struct ds_device *)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
86static void ds9490r_write_block(unsigned long data, u8 *buf, int len)
87{
88 struct ds_device *dev = (struct ds_device *)data;
89
90 ds_write_block(dev, buf, len);
91}
92
93static u8 ds9490r_read_block(unsigned long data, u8 *buf, int len)
94{
95 struct ds_device *dev = (struct ds_device *)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
105static u8 ds9490r_reset(unsigned long data)
106{
107 struct ds_device *dev = (struct ds_device *)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
120static 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 = (unsigned long)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
155err_out_put_device:
156 ds_put_device(ds_dev);
157err_out_free_bus_master:
158 kfree(ds_bus_master);
159
160 return err;
161}
162
163static 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
170module_init(ds_w1_init);
171module_exit(ds_w1_fini);
172
173MODULE_LICENSE("GPL");
174MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");