manual update from 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  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/module.h>
16 #include <linux/string.h>
17 #include <asm/dma.h>
18
19 static struct sysdev_class dma_sysclass = {
20         set_kset_name("dma"),
21 };
22
23 EXPORT_SYMBOL(dma_sysclass);
24
25 static ssize_t dma_show_devices(struct sys_device *dev, char *buf)
26 {
27         ssize_t len = 0;
28         int i;
29
30         for (i = 0; i < MAX_DMA_CHANNELS; i++) {
31                 struct dma_info *info = get_dma_info(i);
32                 struct dma_channel *channel = &info->channels[i];
33
34                 len += sprintf(buf + len, "%2d: %14s    %s\n",
35                                channel->chan, info->name,
36                                channel->dev_id);
37         }
38
39         return len;
40 }
41
42 static SYSDEV_ATTR(devices, S_IRUGO, dma_show_devices, NULL);
43
44 static int __init dma_sysclass_init(void)
45 {
46         int ret;
47
48         ret = sysdev_class_register(&dma_sysclass);
49         if (ret == 0)
50                 sysfs_create_file(&dma_sysclass.kset.kobj, &attr_devices.attr);
51
52         return ret;
53 }
54
55 postcore_initcall(dma_sysclass_init);
56
57 static ssize_t dma_show_dev_id(struct sys_device *dev, char *buf)
58 {
59         struct dma_channel *channel = to_dma_channel(dev);
60         return sprintf(buf, "%s\n", channel->dev_id);
61 }
62
63 static ssize_t dma_store_dev_id(struct sys_device *dev,
64                                 const char *buf, size_t count)
65 {
66         struct dma_channel *channel = to_dma_channel(dev);
67         strcpy(channel->dev_id, buf);
68         return count;
69 }
70
71 static SYSDEV_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id);
72
73 static ssize_t dma_store_config(struct sys_device *dev,
74                                 const char *buf, size_t count)
75 {
76         struct dma_channel *channel = to_dma_channel(dev);
77         unsigned long config;
78
79         config = simple_strtoul(buf, NULL, 0);
80         dma_configure_channel(channel->chan, config);
81
82         return count;
83 }
84
85 static SYSDEV_ATTR(config, S_IWUSR, NULL, dma_store_config);
86
87 static ssize_t dma_show_mode(struct sys_device *dev, char *buf)
88 {
89         struct dma_channel *channel = to_dma_channel(dev);
90         return sprintf(buf, "0x%08x\n", channel->mode);
91 }
92
93 static ssize_t dma_store_mode(struct sys_device *dev,
94                               const char *buf, size_t count)
95 {
96         struct dma_channel *channel = to_dma_channel(dev);
97         channel->mode = simple_strtoul(buf, NULL, 0);
98         return count;
99 }
100
101 static SYSDEV_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode);
102
103 #define dma_ro_attr(field, fmt)                                         \
104 static ssize_t dma_show_##field(struct sys_device *dev, char *buf)      \
105 {                                                                       \
106         struct dma_channel *channel = to_dma_channel(dev);              \
107         return sprintf(buf, fmt, channel->field);                       \
108 }                                                                       \
109 static SYSDEV_ATTR(field, S_IRUGO, dma_show_##field, NULL);
110
111 dma_ro_attr(count, "0x%08x\n");
112 dma_ro_attr(flags, "0x%08lx\n");
113
114 int __init dma_create_sysfs_files(struct dma_channel *chan)
115 {
116         struct sys_device *dev = &chan->dev;
117         int ret;
118
119         dev->id  = chan->chan;
120         dev->cls = &dma_sysclass;
121
122         ret = sysdev_register(dev);
123         if (ret)
124                 return ret;
125
126         sysdev_create_file(dev, &attr_dev_id);
127         sysdev_create_file(dev, &attr_count);
128         sysdev_create_file(dev, &attr_mode);
129         sysdev_create_file(dev, &attr_flags);
130         sysdev_create_file(dev, &attr_config);
131
132         return 0;
133 }
134