rapidio: fix RapidIO sysfs hierarchy
[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 file *filp, struct kobject *kobj,
72                 struct bin_attribute *bin_attr,
73                 char *buf, loff_t off, size_t count)
74 {
75         struct rio_dev *dev =
76             to_rio_dev(container_of(kobj, struct device, kobj));
77         unsigned int size = 0x100;
78         loff_t init_off = off;
79         u8 *data = (u8 *) buf;
80
81         /* Several chips lock up trying to read undefined config space */
82         if (capable(CAP_SYS_ADMIN))
83                 size = 0x200000;
84
85         if (off > size)
86                 return 0;
87         if (off + count > size) {
88                 size -= off;
89                 count = size;
90         } else {
91                 size = count;
92         }
93
94         if ((off & 1) && size) {
95                 u8 val;
96                 rio_read_config_8(dev, off, &val);
97                 data[off - init_off] = val;
98                 off++;
99                 size--;
100         }
101
102         if ((off & 3) && size > 2) {
103                 u16 val;
104                 rio_read_config_16(dev, off, &val);
105                 data[off - init_off] = (val >> 8) & 0xff;
106                 data[off - init_off + 1] = val & 0xff;
107                 off += 2;
108                 size -= 2;
109         }
110
111         while (size > 3) {
112                 u32 val;
113                 rio_read_config_32(dev, off, &val);
114                 data[off - init_off] = (val >> 24) & 0xff;
115                 data[off - init_off + 1] = (val >> 16) & 0xff;
116                 data[off - init_off + 2] = (val >> 8) & 0xff;
117                 data[off - init_off + 3] = val & 0xff;
118                 off += 4;
119                 size -= 4;
120         }
121
122         if (size >= 2) {
123                 u16 val;
124                 rio_read_config_16(dev, off, &val);
125                 data[off - init_off] = (val >> 8) & 0xff;
126                 data[off - init_off + 1] = val & 0xff;
127                 off += 2;
128                 size -= 2;
129         }
130
131         if (size > 0) {
132                 u8 val;
133                 rio_read_config_8(dev, off, &val);
134                 data[off - init_off] = val;
135                 off++;
136                 --size;
137         }
138
139         return count;
140 }
141
142 static ssize_t
143 rio_write_config(struct file *filp, struct kobject *kobj,
144                  struct bin_attribute *bin_attr,
145                  char *buf, loff_t off, size_t count)
146 {
147         struct rio_dev *dev =
148             to_rio_dev(container_of(kobj, struct device, kobj));
149         unsigned int size = count;
150         loff_t init_off = off;
151         u8 *data = (u8 *) buf;
152
153         if (off > 0x200000)
154                 return 0;
155         if (off + count > 0x200000) {
156                 size = 0x200000 - off;
157                 count = size;
158         }
159
160         if ((off & 1) && size) {
161                 rio_write_config_8(dev, off, data[off - init_off]);
162                 off++;
163                 size--;
164         }
165
166         if ((off & 3) && (size > 2)) {
167                 u16 val = data[off - init_off + 1];
168                 val |= (u16) data[off - init_off] << 8;
169                 rio_write_config_16(dev, off, val);
170                 off += 2;
171                 size -= 2;
172         }
173
174         while (size > 3) {
175                 u32 val = data[off - init_off + 3];
176                 val |= (u32) data[off - init_off + 2] << 8;
177                 val |= (u32) data[off - init_off + 1] << 16;
178                 val |= (u32) data[off - init_off] << 24;
179                 rio_write_config_32(dev, off, val);
180                 off += 4;
181                 size -= 4;
182         }
183
184         if (size >= 2) {
185                 u16 val = data[off - init_off + 1];
186                 val |= (u16) data[off - init_off] << 8;
187                 rio_write_config_16(dev, off, val);
188                 off += 2;
189                 size -= 2;
190         }
191
192         if (size) {
193                 rio_write_config_8(dev, off, data[off - init_off]);
194                 off++;
195                 --size;
196         }
197
198         return count;
199 }
200
201 static struct bin_attribute rio_config_attr = {
202         .attr = {
203                  .name = "config",
204                  .mode = S_IRUGO | S_IWUSR,
205                  },
206         .size = 0x200000,
207         .read = rio_read_config,
208         .write = rio_write_config,
209 };
210
211 /**
212  * rio_create_sysfs_dev_files - create RIO specific sysfs files
213  * @rdev: device whose entries should be created
214  *
215  * Create files when @rdev is added to sysfs.
216  */
217 int rio_create_sysfs_dev_files(struct rio_dev *rdev)
218 {
219         int err = 0;
220
221         err = sysfs_create_bin_file(&rdev->dev.kobj, &rio_config_attr);
222
223         return err;
224 }
225
226 /**
227  * rio_remove_sysfs_dev_files - cleanup RIO specific sysfs files
228  * @rdev: device whose entries we should free
229  *
230  * Cleanup when @rdev is removed from sysfs.
231  */
232 void rio_remove_sysfs_dev_files(struct rio_dev *rdev)
233 {
234         sysfs_remove_bin_file(&rdev->dev.kobj, &rio_config_attr);
235 }