Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * arch/sh/drivers/dma/dma-sysfs.c | |
3 | * | |
4 | * sysfs interface for SH DMA API | |
5 | * | |
4dfc119f | 6 | * Copyright (C) 2004 - 2006 Paul Mundt |
1da177e4 LT |
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> | |
0d831770 | 15 | #include <linux/platform_device.h> |
1da177e4 | 16 | #include <linux/module.h> |
0d831770 | 17 | #include <linux/err.h> |
4e57b681 | 18 | #include <linux/string.h> |
1da177e4 LT |
19 | #include <asm/dma.h> |
20 | ||
21 | static struct sysdev_class dma_sysclass = { | |
af5ca3f4 | 22 | .name = "dma", |
1da177e4 | 23 | }; |
1da177e4 LT |
24 | EXPORT_SYMBOL(dma_sysclass); |
25 | ||
4a0b2b4d AK |
26 | static ssize_t dma_show_devices(struct sys_device *dev, |
27 | struct sysdev_attribute *attr, char *buf) | |
1da177e4 LT |
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); | |
4dfc119f PM |
34 | struct dma_channel *channel = get_dma_channel(i); |
35 | ||
36 | if (unlikely(!info) || !channel) | |
37 | continue; | |
1da177e4 LT |
38 | |
39 | len += sprintf(buf + len, "%2d: %14s %s\n", | |
40 | channel->chan, info->name, | |
41 | channel->dev_id); | |
42 | } | |
43 | ||
44 | return len; | |
45 | } | |
46 | ||
47 | static SYSDEV_ATTR(devices, S_IRUGO, dma_show_devices, NULL); | |
48 | ||
49 | static int __init dma_sysclass_init(void) | |
50 | { | |
51 | int ret; | |
52 | ||
53 | ret = sysdev_class_register(&dma_sysclass); | |
711fa809 PM |
54 | if (unlikely(ret)) |
55 | return ret; | |
1da177e4 | 56 | |
711fa809 | 57 | return sysfs_create_file(&dma_sysclass.kset.kobj, &attr_devices.attr); |
1da177e4 | 58 | } |
1da177e4 LT |
59 | postcore_initcall(dma_sysclass_init); |
60 | ||
4a0b2b4d AK |
61 | static ssize_t dma_show_dev_id(struct sys_device *dev, |
62 | struct sysdev_attribute *attr, char *buf) | |
1da177e4 LT |
63 | { |
64 | struct dma_channel *channel = to_dma_channel(dev); | |
65 | return sprintf(buf, "%s\n", channel->dev_id); | |
66 | } | |
67 | ||
68 | static ssize_t dma_store_dev_id(struct sys_device *dev, | |
4a0b2b4d | 69 | struct sysdev_attribute *attr, |
1da177e4 LT |
70 | const char *buf, size_t count) |
71 | { | |
72 | struct dma_channel *channel = to_dma_channel(dev); | |
73 | strcpy(channel->dev_id, buf); | |
74 | return count; | |
75 | } | |
76 | ||
77 | static SYSDEV_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id); | |
78 | ||
79 | static ssize_t dma_store_config(struct sys_device *dev, | |
4a0b2b4d | 80 | struct sysdev_attribute *attr, |
1da177e4 LT |
81 | const char *buf, size_t count) |
82 | { | |
83 | struct dma_channel *channel = to_dma_channel(dev); | |
84 | unsigned long config; | |
85 | ||
86 | config = simple_strtoul(buf, NULL, 0); | |
0d831770 | 87 | dma_configure_channel(channel->vchan, config); |
1da177e4 LT |
88 | |
89 | return count; | |
90 | } | |
91 | ||
92 | static SYSDEV_ATTR(config, S_IWUSR, NULL, dma_store_config); | |
93 | ||
4a0b2b4d AK |
94 | static ssize_t dma_show_mode(struct sys_device *dev, |
95 | struct sysdev_attribute *attr, char *buf) | |
1da177e4 LT |
96 | { |
97 | struct dma_channel *channel = to_dma_channel(dev); | |
98 | return sprintf(buf, "0x%08x\n", channel->mode); | |
99 | } | |
100 | ||
101 | static ssize_t dma_store_mode(struct sys_device *dev, | |
4a0b2b4d | 102 | struct sysdev_attribute *attr, |
1da177e4 LT |
103 | const char *buf, size_t count) |
104 | { | |
105 | struct dma_channel *channel = to_dma_channel(dev); | |
106 | channel->mode = simple_strtoul(buf, NULL, 0); | |
107 | return count; | |
108 | } | |
109 | ||
110 | static SYSDEV_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode); | |
111 | ||
112 | #define dma_ro_attr(field, fmt) \ | |
4a0b2b4d AK |
113 | static ssize_t dma_show_##field(struct sys_device *dev, \ |
114 | struct sysdev_attribute *attr, char *buf)\ | |
1da177e4 LT |
115 | { \ |
116 | struct dma_channel *channel = to_dma_channel(dev); \ | |
117 | return sprintf(buf, fmt, channel->field); \ | |
118 | } \ | |
119 | static SYSDEV_ATTR(field, S_IRUGO, dma_show_##field, NULL); | |
120 | ||
121 | dma_ro_attr(count, "0x%08x\n"); | |
122 | dma_ro_attr(flags, "0x%08lx\n"); | |
123 | ||
0d831770 | 124 | int dma_create_sysfs_files(struct dma_channel *chan, struct dma_info *info) |
1da177e4 LT |
125 | { |
126 | struct sys_device *dev = &chan->dev; | |
0d831770 | 127 | char name[16]; |
1da177e4 LT |
128 | int ret; |
129 | ||
0d831770 | 130 | dev->id = chan->vchan; |
1da177e4 LT |
131 | dev->cls = &dma_sysclass; |
132 | ||
133 | ret = sysdev_register(dev); | |
134 | if (ret) | |
135 | return ret; | |
136 | ||
4dfc119f PM |
137 | ret |= sysdev_create_file(dev, &attr_dev_id); |
138 | ret |= sysdev_create_file(dev, &attr_count); | |
139 | ret |= sysdev_create_file(dev, &attr_mode); | |
140 | ret |= sysdev_create_file(dev, &attr_flags); | |
141 | ret |= sysdev_create_file(dev, &attr_config); | |
142 | ||
143 | if (unlikely(ret)) { | |
144 | dev_err(&info->pdev->dev, "Failed creating attrs\n"); | |
145 | return ret; | |
146 | } | |
1da177e4 | 147 | |
0d831770 PM |
148 | snprintf(name, sizeof(name), "dma%d", chan->chan); |
149 | return sysfs_create_link(&info->pdev->dev.kobj, &dev->kobj, name); | |
150 | } | |
151 | ||
152 | void dma_remove_sysfs_files(struct dma_channel *chan, struct dma_info *info) | |
153 | { | |
154 | struct sys_device *dev = &chan->dev; | |
155 | char name[16]; | |
156 | ||
157 | sysdev_remove_file(dev, &attr_dev_id); | |
158 | sysdev_remove_file(dev, &attr_count); | |
159 | sysdev_remove_file(dev, &attr_mode); | |
160 | sysdev_remove_file(dev, &attr_flags); | |
161 | sysdev_remove_file(dev, &attr_config); | |
162 | ||
163 | snprintf(name, sizeof(name), "dma%d", chan->chan); | |
164 | sysfs_remove_link(&info->pdev->dev.kobj, name); | |
165 | ||
166 | sysdev_unregister(dev); | |
1da177e4 | 167 | } |