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Diffstat (limited to 'drivers/i2c/busses/i2c-isa.c')
-rw-r--r--drivers/i2c/busses/i2c-isa.c192
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diff --git a/drivers/i2c/busses/i2c-isa.c b/drivers/i2c/busses/i2c-isa.c
deleted file mode 100644
index b0e1370075de..000000000000
--- a/drivers/i2c/busses/i2c-isa.c
+++ /dev/null
@@ -1,192 +0,0 @@
1/*
2 i2c-isa.c - an i2c-core-like thing for ISA hardware monitoring chips
3 Copyright (C) 2005 Jean Delvare <khali@linux-fr.org>
4
5 Based on the i2c-isa pseudo-adapter from the lm_sensors project
6 Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21*/
22
23/* This implements an i2c-core-like thing for ISA hardware monitoring
24 chips. Such chips are linked to the i2c subsystem for historical
25 reasons (because the early ISA hardware monitoring chips such as the
26 LM78 had both an I2C and an ISA interface). They used to be
27 registered with the main i2c-core, but as a first step in the
28 direction of a clean separation between I2C and ISA chip drivers,
29 we now have this separate core for ISA ones. It is significantly
30 more simple than the real one, of course, because we don't have to
31 handle multiple busses: there is only one (fake) ISA adapter.
32 It is worth noting that we still rely on i2c-core for some things
33 at the moment - but hopefully this won't last. */
34
35#include <linux/init.h>
36#include <linux/module.h>
37#include <linux/kernel.h>
38#include <linux/errno.h>
39#include <linux/i2c.h>
40#include <linux/i2c-isa.h>
41#include <linux/platform_device.h>
42#include <linux/completion.h>
43
44/* Exported by i2c-core for i2c-isa only */
45extern void i2c_adapter_dev_release(struct device *dev);
46extern struct class i2c_adapter_class;
47
48static u32 isa_func(struct i2c_adapter *adapter);
49
50/* This is the actual algorithm we define */
51static const struct i2c_algorithm isa_algorithm = {
52 .functionality = isa_func,
53};
54
55/* There can only be one... */
56static struct i2c_adapter isa_adapter = {
57 .owner = THIS_MODULE,
58 .id = I2C_HW_ISA,
59 .class = I2C_CLASS_HWMON,
60 .algo = &isa_algorithm,
61 .name = "ISA main adapter",
62};
63
64/* We can't do a thing... */
65static u32 isa_func(struct i2c_adapter *adapter)
66{
67 return 0;
68}
69
70
71/* We implement an interface which resembles i2c_{add,del}_driver,
72 but for i2c-isa drivers. We don't have to remember and handle lists
73 of drivers and adapters so this is much more simple, of course. */
74
75int i2c_isa_add_driver(struct i2c_driver *driver)
76{
77 int res;
78
79 /* Add the driver to the list of i2c drivers in the driver core */
80 driver->driver.bus = &i2c_bus_type;
81 res = driver_register(&driver->driver);
82 if (res)
83 return res;
84 dev_dbg(&isa_adapter.dev, "Driver %s registered\n", driver->driver.name);
85
86 /* Now look for clients */
87 res = driver->attach_adapter(&isa_adapter);
88 if (res) {
89 dev_dbg(&isa_adapter.dev,
90 "Driver %s failed to attach adapter, unregistering\n",
91 driver->driver.name);
92 driver_unregister(&driver->driver);
93 }
94 return res;
95}
96
97int i2c_isa_del_driver(struct i2c_driver *driver)
98{
99 struct list_head *item, *_n;
100 struct i2c_client *client;
101 int res;
102
103 /* Detach all clients belonging to this one driver */
104 list_for_each_safe(item, _n, &isa_adapter.clients) {
105 client = list_entry(item, struct i2c_client, list);
106 if (client->driver != driver)
107 continue;
108 dev_dbg(&isa_adapter.dev, "Detaching client %s at 0x%x\n",
109 client->name, client->addr);
110 if ((res = driver->detach_client(client))) {
111 dev_err(&isa_adapter.dev, "Failed, driver "
112 "%s not unregistered!\n",
113 driver->driver.name);
114 return res;
115 }
116 }
117
118 /* Get the driver off the core list */
119 driver_unregister(&driver->driver);
120 dev_dbg(&isa_adapter.dev, "Driver %s unregistered\n", driver->driver.name);
121
122 return 0;
123}
124
125
126static int __init i2c_isa_init(void)
127{
128 int err;
129
130 mutex_init(&isa_adapter.clist_lock);
131 INIT_LIST_HEAD(&isa_adapter.clients);
132
133 isa_adapter.nr = ANY_I2C_ISA_BUS;
134 isa_adapter.dev.parent = &platform_bus;
135 sprintf(isa_adapter.dev.bus_id, "i2c-%d", isa_adapter.nr);
136 isa_adapter.dev.release = &i2c_adapter_dev_release;
137 isa_adapter.dev.class = &i2c_adapter_class;
138 err = device_register(&isa_adapter.dev);
139 if (err) {
140 printk(KERN_ERR "i2c-isa: Failed to register device\n");
141 goto exit;
142 }
143
144 dev_dbg(&isa_adapter.dev, "%s registered\n", isa_adapter.name);
145
146 return 0;
147
148exit:
149 return err;
150}
151
152static void __exit i2c_isa_exit(void)
153{
154#ifdef DEBUG
155 struct list_head *item, *_n;
156 struct i2c_client *client = NULL;
157#endif
158
159 /* There should be no more active client */
160#ifdef DEBUG
161 dev_dbg(&isa_adapter.dev, "Looking for clients\n");
162 list_for_each_safe(item, _n, &isa_adapter.clients) {
163 client = list_entry(item, struct i2c_client, list);
164 dev_err(&isa_adapter.dev, "Driver %s still has an active "
165 "ISA client at 0x%x\n", client->driver->driver.name,
166 client->addr);
167 }
168 if (client != NULL)
169 return;
170#endif
171
172 /* Clean up the sysfs representation */
173 dev_dbg(&isa_adapter.dev, "Unregistering from sysfs\n");
174 init_completion(&isa_adapter.dev_released);
175 device_unregister(&isa_adapter.dev);
176
177 /* Wait for sysfs to drop all references */
178 dev_dbg(&isa_adapter.dev, "Waiting for sysfs completion\n");
179 wait_for_completion(&isa_adapter.dev_released);
180
181 dev_dbg(&isa_adapter.dev, "%s unregistered\n", isa_adapter.name);
182}
183
184EXPORT_SYMBOL(i2c_isa_add_driver);
185EXPORT_SYMBOL(i2c_isa_del_driver);
186
187MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
188MODULE_DESCRIPTION("ISA bus access through i2c");
189MODULE_LICENSE("GPL");
190
191module_init(i2c_isa_init);
192module_exit(i2c_isa_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2025-10-31 08:04:53 -0400