Merge branch 'upstream'
[linux-2.6] / arch / sh / drivers / dma / dma-sysfs.c
1 /*
2  * arch/sh/drivers/dma/dma-sysfs.c
3  *
4  * sysfs interface for SH DMA API
5  *
6  * Copyright (C) 2004, 2005  Paul Mundt
7  *
8  * This file is subject to the terms and conditions of the GNU General Public
9  * License.  See the file "COPYING" in the main directory of this archive
10  * for more details.
11  */
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/sysdev.h>
15 #include <linux/platform_device.h>
16 #include <linux/module.h>
17 #include <linux/err.h>
18 #include <linux/string.h>
19 #include <asm/dma.h>
20
21 static struct sysdev_class dma_sysclass = {
22         set_kset_name("dma"),
23 };
24
25 EXPORT_SYMBOL(dma_sysclass);
26
27 static ssize_t dma_show_devices(struct sys_device *dev, char *buf)
28 {
29         ssize_t len = 0;
30         int i;
31
32         for (i = 0; i < MAX_DMA_CHANNELS; i++) {
33                 struct dma_info *info = get_dma_info(i);
34                 struct dma_channel *channel = &info->channels[i];
35
36                 len += sprintf(buf + len, "%2d: %14s    %s\n",
37                                channel->chan, info->name,
38                                channel->dev_id);
39         }
40
41         return len;
42 }
43
44 static SYSDEV_ATTR(devices, S_IRUGO, dma_show_devices, NULL);
45
46 static int __init dma_sysclass_init(void)
47 {
48         int ret;
49
50         ret = sysdev_class_register(&dma_sysclass);
51         if (ret == 0)
52                 sysfs_create_file(&dma_sysclass.kset.kobj, &attr_devices.attr);
53
54         return ret;
55 }
56
57 postcore_initcall(dma_sysclass_init);
58
59 static ssize_t dma_show_dev_id(struct sys_device *dev, char *buf)
60 {
61         struct dma_channel *channel = to_dma_channel(dev);
62         return sprintf(buf, "%s\n", channel->dev_id);
63 }
64
65 static ssize_t dma_store_dev_id(struct sys_device *dev,
66                                 const char *buf, size_t count)
67 {
68         struct dma_channel *channel = to_dma_channel(dev);
69         strcpy(channel->dev_id, buf);
70         return count;
71 }
72
73 static SYSDEV_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id);
74
75 static ssize_t dma_store_config(struct sys_device *dev,
76                                 const char *buf, size_t count)
77 {
78         struct dma_channel *channel = to_dma_channel(dev);
79         unsigned long config;
80
81         config = simple_strtoul(buf, NULL, 0);
82         dma_configure_channel(channel->vchan, config);
83
84         return count;
85 }
86
87 static SYSDEV_ATTR(config, S_IWUSR, NULL, dma_store_config);
88
89 static ssize_t dma_show_mode(struct sys_device *dev, char *buf)
90 {
91         struct dma_channel *channel = to_dma_channel(dev);
92         return sprintf(buf, "0x%08x\n", channel->mode);
93 }
94
95 static ssize_t dma_store_mode(struct sys_device *dev,
96                               const char *buf, size_t count)
97 {
98         struct dma_channel *channel = to_dma_channel(dev);
99         channel->mode = simple_strtoul(buf, NULL, 0);
100         return count;
101 }
102
103 static SYSDEV_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode);
104
105 #define dma_ro_attr(field, fmt)                                         \
106 static ssize_t dma_show_##field(struct sys_device *dev, char *buf)      \
107 {                                                                       \
108         struct dma_channel *channel = to_dma_channel(dev);              \
109         return sprintf(buf, fmt, channel->field);                       \
110 }                                                                       \
111 static SYSDEV_ATTR(field, S_IRUGO, dma_show_##field, NULL);
112
113 dma_ro_attr(count, "0x%08x\n");
114 dma_ro_attr(flags, "0x%08lx\n");
115
116 int dma_create_sysfs_files(struct dma_channel *chan, struct dma_info *info)
117 {
118         struct sys_device *dev = &chan->dev;
119         char name[16];
120         int ret;
121
122         dev->id  = chan->vchan;
123         dev->cls = &dma_sysclass;
124
125         ret = sysdev_register(dev);
126         if (ret)
127                 return ret;
128
129         sysdev_create_file(dev, &attr_dev_id);
130         sysdev_create_file(dev, &attr_count);
131         sysdev_create_file(dev, &attr_mode);
132         sysdev_create_file(dev, &attr_flags);
133         sysdev_create_file(dev, &attr_config);
134
135         snprintf(name, sizeof(name), "dma%d", chan->chan);
136         return sysfs_create_link(&info->pdev->dev.kobj, &dev->kobj, name);
137 }
138
139 void dma_remove_sysfs_files(struct dma_channel *chan, struct dma_info *info)
140 {
141         struct sys_device *dev = &chan->dev;
142         char name[16];
143
144         sysdev_remove_file(dev, &attr_dev_id);
145         sysdev_remove_file(dev, &attr_count);
146         sysdev_remove_file(dev, &attr_mode);
147         sysdev_remove_file(dev, &attr_flags);
148         sysdev_remove_file(dev, &attr_config);
149
150         snprintf(name, sizeof(name), "dma%d", chan->chan);
151         sysfs_remove_link(&info->pdev->dev.kobj, name);
152
153         sysdev_unregister(dev);
154 }
155