Input: ff-memless - another fix for signed to unsigned overflow
[linux-2.6.git] / 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/kernel.h>
14 #include <linux/rio.h>
15 #include <linux/rio_drv.h>
16 #include <linux/stat.h>
17
18 #include "rio.h"
19
20 /* Sysfs support */
21 #define rio_config_attr(field, format_string)                                   \
22 static ssize_t                                                          \
23 field##_show(struct device *dev, struct device_attribute *attr, char *buf)                      \
24 {                                                                       \
25         struct rio_dev *rdev = to_rio_dev(dev);                         \
26                                                                         \
27         return sprintf(buf, format_string, rdev->field);                \
28 }                                                                       \
29
30 rio_config_attr(did, "0x%04x\n");
31 rio_config_attr(vid, "0x%04x\n");
32 rio_config_attr(device_rev, "0x%08x\n");
33 rio_config_attr(asm_did, "0x%04x\n");
34 rio_config_attr(asm_vid, "0x%04x\n");
35 rio_config_attr(asm_rev, "0x%04x\n");
36
37 static ssize_t routes_show(struct device *dev, struct device_attribute *attr, char *buf)
38 {
39         struct rio_dev *rdev = to_rio_dev(dev);
40         char *str = buf;
41         int i;
42
43         if (!rdev->rswitch)
44                 goto out;
45
46         for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
47                         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, struct bin_attribute *bin_attr,
72                 char *buf, loff_t off, size_t count)
73 {
74         struct rio_dev *dev =
75             to_rio_dev(container_of(kobj, struct device, kobj));
76         unsigned int size = 0x100;
77         loff_t init_off = off;
78         u8 *data = (u8 *) buf;
79
80         /* Several chips lock up trying to read undefined config space */
81         if (capable(CAP_SYS_ADMIN))
82                 size = 0x200000;
83
84         if (off > size)
85                 return 0;
86         if (off + count > size) {
87                 size -= off;
88                 count = size;
89         } else {
90                 size = count;
91         }
92
93         if ((off & 1) && size) {
94                 u8 val;
95                 rio_read_config_8(dev, off, &val);
96                 data[off - init_off] = val;
97                 off++;
98                 size--;
99         }
100
101         if ((off & 3) && size > 2) {
102                 u16 val;
103                 rio_read_config_16(dev, off, &val);
104                 data[off - init_off] = (val >> 8) & 0xff;
105                 data[off - init_off + 1] = val & 0xff;
106                 off += 2;
107                 size -= 2;
108         }
109
110         while (size > 3) {
111                 u32 val;
112                 rio_read_config_32(dev, off, &val);
113                 data[off - init_off] = (val >> 24) & 0xff;
114                 data[off - init_off + 1] = (val >> 16) & 0xff;
115                 data[off - init_off + 2] = (val >> 8) & 0xff;
116                 data[off - init_off + 3] = val & 0xff;
117                 off += 4;
118                 size -= 4;
119         }
120
121         if (size >= 2) {
122                 u16 val;
123                 rio_read_config_16(dev, off, &val);
124                 data[off - init_off] = (val >> 8) & 0xff;
125                 data[off - init_off + 1] = val & 0xff;
126                 off += 2;
127                 size -= 2;
128         }
129
130         if (size > 0) {
131                 u8 val;
132                 rio_read_config_8(dev, off, &val);
133                 data[off - init_off] = val;
134                 off++;
135                 --size;
136         }
137
138         return count;
139 }
140
141 static ssize_t
142 rio_write_config(struct kobject *kobj, struct bin_attribute *bin_attr,
143                  char *buf, loff_t off, size_t count)
144 {
145         struct rio_dev *dev =
146             to_rio_dev(container_of(kobj, struct device, kobj));
147         unsigned int size = count;
148         loff_t init_off = off;
149         u8 *data = (u8 *) buf;
150
151         if (off > 0x200000)
152                 return 0;
153         if (off + count > 0x200000) {
154                 size = 0x200000 - off;
155                 count = size;
156         }
157
158         if ((off & 1) && size) {
159                 rio_write_config_8(dev, off, data[off - init_off]);
160                 off++;
161                 size--;
162         }
163
164         if ((off & 3) && (size > 2)) {
165                 u16 val = data[off - init_off + 1];
166                 val |= (u16) data[off - init_off] << 8;
167                 rio_write_config_16(dev, off, val);
168                 off += 2;
169                 size -= 2;
170         }
171
172         while (size > 3) {
173                 u32 val = data[off - init_off + 3];
174                 val |= (u32) data[off - init_off + 2] << 8;
175                 val |= (u32) data[off - init_off + 1] << 16;
176                 val |= (u32) data[off - init_off] << 24;
177                 rio_write_config_32(dev, off, val);
178                 off += 4;
179                 size -= 4;
180         }
181
182         if (size >= 2) {
183                 u16 val = data[off - init_off + 1];
184                 val |= (u16) data[off - init_off] << 8;
185                 rio_write_config_16(dev, off, val);
186                 off += 2;
187                 size -= 2;
188         }
189
190         if (size) {
191                 rio_write_config_8(dev, off, data[off - init_off]);
192                 off++;
193                 --size;
194         }
195
196         return count;
197 }
198
199 static struct bin_attribute rio_config_attr = {
200         .attr = {
201                  .name = "config",
202                  .mode = S_IRUGO | S_IWUSR,
203                  },
204         .size = 0x200000,
205         .read = rio_read_config,
206         .write = rio_write_config,
207 };
208
209 /**
210  * rio_create_sysfs_dev_files - create RIO specific sysfs files
211  * @rdev: device whose entries should be created
212  *
213  * Create files when @rdev is added to sysfs.
214  */
215 int rio_create_sysfs_dev_files(struct rio_dev *rdev)
216 {
217         int err = 0;
218
219         err = sysfs_create_bin_file(&rdev->dev.kobj, &rio_config_attr);
220
221         return err;
222 }
223
224 /**
225  * rio_remove_sysfs_dev_files - cleanup RIO specific sysfs files
226  * @rdev: device whose entries we should free
227  *
228  * Cleanup when @rdev is removed from sysfs.
229  */
230 void rio_remove_sysfs_dev_files(struct rio_dev *rdev)
231 {
232         sysfs_remove_bin_file(&rdev->dev.kobj, &rio_config_attr);
233 }