Merge branch 'for-davem' of ssh://master.kernel.org/pub/scm/linux/kernel/git/linville...
[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         for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
44                         i++) {
45                 if (rdev->rswitch->route_table[i] == RIO_INVALID_ROUTE)
46                         continue;
47                 str +=
48                     sprintf(str, "%04x %02x\n", i,
49                             rdev->rswitch->route_table[i]);
50         }
51
52         return (str - buf);
53 }
54
55 struct device_attribute rio_dev_attrs[] = {
56         __ATTR_RO(did),
57         __ATTR_RO(vid),
58         __ATTR_RO(device_rev),
59         __ATTR_RO(asm_did),
60         __ATTR_RO(asm_vid),
61         __ATTR_RO(asm_rev),
62         __ATTR_NULL,
63 };
64
65 static DEVICE_ATTR(routes, S_IRUGO, routes_show, NULL);
66
67 static ssize_t
68 rio_read_config(struct file *filp, struct kobject *kobj,
69                 struct bin_attribute *bin_attr,
70                 char *buf, loff_t off, size_t count)
71 {
72         struct rio_dev *dev =
73             to_rio_dev(container_of(kobj, struct device, kobj));
74         unsigned int size = 0x100;
75         loff_t init_off = off;
76         u8 *data = (u8 *) buf;
77
78         /* Several chips lock up trying to read undefined config space */
79         if (capable(CAP_SYS_ADMIN))
80                 size = RIO_MAINT_SPACE_SZ;
81
82         if (off >= size)
83                 return 0;
84         if (off + count > size) {
85                 size -= off;
86                 count = size;
87         } else {
88                 size = count;
89         }
90
91         if ((off & 1) && size) {
92                 u8 val;
93                 rio_read_config_8(dev, off, &val);
94                 data[off - init_off] = val;
95                 off++;
96                 size--;
97         }
98
99         if ((off & 3) && size > 2) {
100                 u16 val;
101                 rio_read_config_16(dev, off, &val);
102                 data[off - init_off] = (val >> 8) & 0xff;
103                 data[off - init_off + 1] = val & 0xff;
104                 off += 2;
105                 size -= 2;
106         }
107
108         while (size > 3) {
109                 u32 val;
110                 rio_read_config_32(dev, off, &val);
111                 data[off - init_off] = (val >> 24) & 0xff;
112                 data[off - init_off + 1] = (val >> 16) & 0xff;
113                 data[off - init_off + 2] = (val >> 8) & 0xff;
114                 data[off - init_off + 3] = val & 0xff;
115                 off += 4;
116                 size -= 4;
117         }
118
119         if (size >= 2) {
120                 u16 val;
121                 rio_read_config_16(dev, off, &val);
122                 data[off - init_off] = (val >> 8) & 0xff;
123                 data[off - init_off + 1] = val & 0xff;
124                 off += 2;
125                 size -= 2;
126         }
127
128         if (size > 0) {
129                 u8 val;
130                 rio_read_config_8(dev, off, &val);
131                 data[off - init_off] = val;
132                 off++;
133                 --size;
134         }
135
136         return count;
137 }
138
139 static ssize_t
140 rio_write_config(struct file *filp, struct kobject *kobj,
141                  struct bin_attribute *bin_attr,
142                  char *buf, loff_t off, size_t count)
143 {
144         struct rio_dev *dev =
145             to_rio_dev(container_of(kobj, struct device, kobj));
146         unsigned int size = count;
147         loff_t init_off = off;
148         u8 *data = (u8 *) buf;
149
150         if (off >= RIO_MAINT_SPACE_SZ)
151                 return 0;
152         if (off + count > RIO_MAINT_SPACE_SZ) {
153                 size = RIO_MAINT_SPACE_SZ - off;
154                 count = size;
155         }
156
157         if ((off & 1) && size) {
158                 rio_write_config_8(dev, off, data[off - init_off]);
159                 off++;
160                 size--;
161         }
162
163         if ((off & 3) && (size > 2)) {
164                 u16 val = data[off - init_off + 1];
165                 val |= (u16) data[off - init_off] << 8;
166                 rio_write_config_16(dev, off, val);
167                 off += 2;
168                 size -= 2;
169         }
170
171         while (size > 3) {
172                 u32 val = data[off - init_off + 3];
173                 val |= (u32) data[off - init_off + 2] << 8;
174                 val |= (u32) data[off - init_off + 1] << 16;
175                 val |= (u32) data[off - init_off] << 24;
176                 rio_write_config_32(dev, off, val);
177                 off += 4;
178                 size -= 4;
179         }
180
181         if (size >= 2) {
182                 u16 val = data[off - init_off + 1];
183                 val |= (u16) data[off - init_off] << 8;
184                 rio_write_config_16(dev, off, val);
185                 off += 2;
186                 size -= 2;
187         }
188
189         if (size) {
190                 rio_write_config_8(dev, off, data[off - init_off]);
191                 off++;
192                 --size;
193         }
194
195         return count;
196 }
197
198 static struct bin_attribute rio_config_attr = {
199         .attr = {
200                  .name = "config",
201                  .mode = S_IRUGO | S_IWUSR,
202                  },
203         .size = RIO_MAINT_SPACE_SZ,
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         int err = 0;
217
218         err = device_create_bin_file(&rdev->dev, &rio_config_attr);
219
220         if (!err && (rdev->pef & RIO_PEF_SWITCH)) {
221                 err = device_create_file(&rdev->dev, &dev_attr_routes);
222                 if (!err && rdev->rswitch->sw_sysfs)
223                         err = rdev->rswitch->sw_sysfs(rdev, RIO_SW_SYSFS_CREATE);
224         }
225
226         if (err)
227                 pr_warning("RIO: Failed to create attribute file(s) for %s\n",
228                            rio_name(rdev));
229
230         return err;
231 }
232
233 /**
234  * rio_remove_sysfs_dev_files - cleanup RIO specific sysfs files
235  * @rdev: device whose entries we should free
236  *
237  * Cleanup when @rdev is removed from sysfs.
238  */
239 void rio_remove_sysfs_dev_files(struct rio_dev *rdev)
240 {
241         device_remove_bin_file(&rdev->dev, &rio_config_attr);
242         if (rdev->pef & RIO_PEF_SWITCH) {
243                 device_remove_file(&rdev->dev, &dev_attr_routes);
244                 if (rdev->rswitch->sw_sysfs)
245                         rdev->rswitch->sw_sysfs(rdev, RIO_SW_SYSFS_REMOVE);
246         }
247 }