Merge master.kernel.org:/pub/scm/linux/kernel/git/dtor/input
[linux-2.6] / drivers / rapidio / rio-sysfs.c
1 /*
2  * RapidIO sysfs attributes and support
3  *
4  * Copyright 2005 MontaVista Software, Inc.
5  * Matt Porter <mporter@kernel.crashing.org>
6  *
7  * This program is free software; you can redistribute  it and/or modify it
8  * under  the terms of  the GNU General  Public License as published by the
9  * Free Software Foundation;  either version 2 of the  License, or (at your
10  * option) any later version.
11  */
12
13 #include <linux/config.h>
14 #include <linux/kernel.h>
15 #include <linux/rio.h>
16 #include <linux/rio_drv.h>
17 #include <linux/stat.h>
18
19 #include "rio.h"
20
21 /* Sysfs support */
22 #define rio_config_attr(field, format_string)                                   \
23 static ssize_t                                                          \
24 field##_show(struct device *dev, struct device_attribute *attr, char *buf)                      \
25 {                                                                       \
26         struct rio_dev *rdev = to_rio_dev(dev);                         \
27                                                                         \
28         return sprintf(buf, format_string, rdev->field);                \
29 }                                                                       \
30
31 rio_config_attr(did, "0x%04x\n");
32 rio_config_attr(vid, "0x%04x\n");
33 rio_config_attr(device_rev, "0x%08x\n");
34 rio_config_attr(asm_did, "0x%04x\n");
35 rio_config_attr(asm_vid, "0x%04x\n");
36 rio_config_attr(asm_rev, "0x%04x\n");
37
38 static ssize_t routes_show(struct device *dev, struct device_attribute *attr, char *buf)
39 {
40         struct rio_dev *rdev = to_rio_dev(dev);
41         char *str = buf;
42         int i;
43
44         if (!rdev->rswitch)
45                 goto out;
46
47         for (i = 0; i < RIO_MAX_ROUTE_ENTRIES; i++) {
48                 if (rdev->rswitch->route_table[i] == RIO_INVALID_ROUTE)
49                         continue;
50                 str +=
51                     sprintf(str, "%04x %02x\n", i,
52                             rdev->rswitch->route_table[i]);
53         }
54
55       out:
56         return (str - buf);
57 }
58
59 struct device_attribute rio_dev_attrs[] = {
60         __ATTR_RO(did),
61         __ATTR_RO(vid),
62         __ATTR_RO(device_rev),
63         __ATTR_RO(asm_did),
64         __ATTR_RO(asm_vid),
65         __ATTR_RO(asm_rev),
66         __ATTR_RO(routes),
67         __ATTR_NULL,
68 };
69
70 static ssize_t
71 rio_read_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
72 {
73         struct rio_dev *dev =
74             to_rio_dev(container_of(kobj, struct device, kobj));
75         unsigned int size = 0x100;
76         loff_t init_off = off;
77         u8 *data = (u8 *) buf;
78
79         /* Several chips lock up trying to read undefined config space */
80         if (capable(CAP_SYS_ADMIN))
81                 size = 0x200000;
82
83         if (off > size)
84                 return 0;
85         if (off + count > size) {
86                 size -= off;
87                 count = size;
88         } else {
89                 size = count;
90         }
91
92         if ((off & 1) && size) {
93                 u8 val;
94                 rio_read_config_8(dev, off, &val);
95                 data[off - init_off] = val;
96                 off++;
97                 size--;
98         }
99
100         if ((off & 3) && size > 2) {
101                 u16 val;
102                 rio_read_config_16(dev, off, &val);
103                 data[off - init_off] = (val >> 8) & 0xff;
104                 data[off - init_off + 1] = val & 0xff;
105                 off += 2;
106                 size -= 2;
107         }
108
109         while (size > 3) {
110                 u32 val;
111                 rio_read_config_32(dev, off, &val);
112                 data[off - init_off] = (val >> 24) & 0xff;
113                 data[off - init_off + 1] = (val >> 16) & 0xff;
114                 data[off - init_off + 2] = (val >> 8) & 0xff;
115                 data[off - init_off + 3] = val & 0xff;
116                 off += 4;
117                 size -= 4;
118         }
119
120         if (size >= 2) {
121                 u16 val;
122                 rio_read_config_16(dev, off, &val);
123                 data[off - init_off] = (val >> 8) & 0xff;
124                 data[off - init_off + 1] = val & 0xff;
125                 off += 2;
126                 size -= 2;
127         }
128
129         if (size > 0) {
130                 u8 val;
131                 rio_read_config_8(dev, off, &val);
132                 data[off - init_off] = val;
133                 off++;
134                 --size;
135         }
136
137         return count;
138 }
139
140 static ssize_t
141 rio_write_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
142 {
143         struct rio_dev *dev =
144             to_rio_dev(container_of(kobj, struct device, kobj));
145         unsigned int size = count;
146         loff_t init_off = off;
147         u8 *data = (u8 *) buf;
148
149         if (off > 0x200000)
150                 return 0;
151         if (off + count > 0x200000) {
152                 size = 0x200000 - off;
153                 count = size;
154         }
155
156         if ((off & 1) && size) {
157                 rio_write_config_8(dev, off, data[off - init_off]);
158                 off++;
159                 size--;
160         }
161
162         if ((off & 3) && (size > 2)) {
163                 u16 val = data[off - init_off + 1];
164                 val |= (u16) data[off - init_off] << 8;
165                 rio_write_config_16(dev, off, val);
166                 off += 2;
167                 size -= 2;
168         }
169
170         while (size > 3) {
171                 u32 val = data[off - init_off + 3];
172                 val |= (u32) data[off - init_off + 2] << 8;
173                 val |= (u32) data[off - init_off + 1] << 16;
174                 val |= (u32) data[off - init_off] << 24;
175                 rio_write_config_32(dev, off, val);
176                 off += 4;
177                 size -= 4;
178         }
179
180         if (size >= 2) {
181                 u16 val = data[off - init_off + 1];
182                 val |= (u16) data[off - init_off] << 8;
183                 rio_write_config_16(dev, off, val);
184                 off += 2;
185                 size -= 2;
186         }
187
188         if (size) {
189                 rio_write_config_8(dev, off, data[off - init_off]);
190                 off++;
191                 --size;
192         }
193
194         return count;
195 }
196
197 static struct bin_attribute rio_config_attr = {
198         .attr = {
199                  .name = "config",
200                  .mode = S_IRUGO | S_IWUSR,
201                  .owner = THIS_MODULE,
202                  },
203         .size = 0x200000,
204         .read = rio_read_config,
205         .write = rio_write_config,
206 };
207
208 /**
209  * rio_create_sysfs_dev_files - create RIO specific sysfs files
210  * @rdev: device whose entries should be created
211  *
212  * Create files when @rdev is added to sysfs.
213  */
214 int rio_create_sysfs_dev_files(struct rio_dev *rdev)
215 {
216         sysfs_create_bin_file(&rdev->dev.kobj, &rio_config_attr);
217
218         return 0;
219 }
220
221 /**
222  * rio_remove_sysfs_dev_files - cleanup RIO specific sysfs files
223  * @rdev: device whose entries we should free
224  *
225  * Cleanup when @rdev is removed from sysfs.
226  */
227 void rio_remove_sysfs_dev_files(struct rio_dev *rdev)
228 {
229         sysfs_remove_bin_file(&rdev->dev.kobj, &rio_config_attr);
230 }