Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6
[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 - 2006  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 EXPORT_SYMBOL(dma_sysclass);
25
26 static ssize_t dma_show_devices(struct sys_device *dev, char *buf)
27 {
28         ssize_t len = 0;
29         int i;
30
31         for (i = 0; i < MAX_DMA_CHANNELS; i++) {
32                 struct dma_info *info = get_dma_info(i);
33                 struct dma_channel *channel = get_dma_channel(i);
34
35                 if (unlikely(!info) || !channel)
36                         continue;
37
38                 len += sprintf(buf + len, "%2d: %14s    %s\n",
39                                channel->chan, info->name,
40                                channel->dev_id);
41         }
42
43         return len;
44 }
45
46 static SYSDEV_ATTR(devices, S_IRUGO, dma_show_devices, NULL);
47
48 static int __init dma_sysclass_init(void)
49 {
50         int ret;
51
52         ret = sysdev_class_register(&dma_sysclass);
53         if (unlikely(ret))
54                 return ret;
55
56         return sysfs_create_file(&dma_sysclass.kset.kobj, &attr_devices.attr);
57 }
58 postcore_initcall(dma_sysclass_init);
59
60 static ssize_t dma_show_dev_id(struct sys_device *dev, char *buf)
61 {
62         struct dma_channel *channel = to_dma_channel(dev);
63         return sprintf(buf, "%s\n", channel->dev_id);
64 }
65
66 static ssize_t dma_store_dev_id(struct sys_device *dev,
67                                 const char *buf, size_t count)
68 {
69         struct dma_channel *channel = to_dma_channel(dev);
70         strcpy(channel->dev_id, buf);
71         return count;
72 }
73
74 static SYSDEV_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id);
75
76 static ssize_t dma_store_config(struct sys_device *dev,
77                                 const char *buf, size_t count)
78 {
79         struct dma_channel *channel = to_dma_channel(dev);
80         unsigned long config;
81
82         config = simple_strtoul(buf, NULL, 0);
83         dma_configure_channel(channel->vchan, config);
84
85         return count;
86 }
87
88 static SYSDEV_ATTR(config, S_IWUSR, NULL, dma_store_config);
89
90 static ssize_t dma_show_mode(struct sys_device *dev, char *buf)
91 {
92         struct dma_channel *channel = to_dma_channel(dev);
93         return sprintf(buf, "0x%08x\n", channel->mode);
94 }
95
96 static ssize_t dma_store_mode(struct sys_device *dev,
97                               const char *buf, size_t count)
98 {
99         struct dma_channel *channel = to_dma_channel(dev);
100         channel->mode = simple_strtoul(buf, NULL, 0);
101         return count;
102 }
103
104 static SYSDEV_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode);
105
106 #define dma_ro_attr(field, fmt)                                         \
107 static ssize_t dma_show_##field(struct sys_device *dev, char *buf)      \
108 {                                                                       \
109         struct dma_channel *channel = to_dma_channel(dev);              \
110         return sprintf(buf, fmt, channel->field);                       \
111 }                                                                       \
112 static SYSDEV_ATTR(field, S_IRUGO, dma_show_##field, NULL);
113
114 dma_ro_attr(count, "0x%08x\n");
115 dma_ro_attr(flags, "0x%08lx\n");
116
117 int dma_create_sysfs_files(struct dma_channel *chan, struct dma_info *info)
118 {
119         struct sys_device *dev = &chan->dev;
120         char name[16];
121         int ret;
122
123         dev->id  = chan->vchan;
124         dev->cls = &dma_sysclass;
125
126         ret = sysdev_register(dev);
127         if (ret)
128                 return ret;
129
130         ret |= sysdev_create_file(dev, &attr_dev_id);
131         ret |= sysdev_create_file(dev, &attr_count);
132         ret |= sysdev_create_file(dev, &attr_mode);
133         ret |= sysdev_create_file(dev, &attr_flags);
134         ret |= sysdev_create_file(dev, &attr_config);
135
136         if (unlikely(ret)) {
137                 dev_err(&info->pdev->dev, "Failed creating attrs\n");
138                 return ret;
139         }
140
141         snprintf(name, sizeof(name), "dma%d", chan->chan);
142         return sysfs_create_link(&info->pdev->dev.kobj, &dev->kobj, name);
143 }
144
145 void dma_remove_sysfs_files(struct dma_channel *chan, struct dma_info *info)
146 {
147         struct sys_device *dev = &chan->dev;
148         char name[16];
149
150         sysdev_remove_file(dev, &attr_dev_id);
151         sysdev_remove_file(dev, &attr_count);
152         sysdev_remove_file(dev, &attr_mode);
153         sysdev_remove_file(dev, &attr_flags);
154         sysdev_remove_file(dev, &attr_config);
155
156         snprintf(name, sizeof(name), "dma%d", chan->chan);
157         sysfs_remove_link(&info->pdev->dev.kobj, name);
158
159         sysdev_unregister(dev);
160 }