Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 <asm/dma.h> |
| 17 | |
| 18 | static struct sysdev_class dma_sysclass = { |
| 19 | set_kset_name("dma"), |
| 20 | }; |
| 21 | |
| 22 | EXPORT_SYMBOL(dma_sysclass); |
| 23 | |
| 24 | static ssize_t dma_show_devices(struct sys_device *dev, char *buf) |
| 25 | { |
| 26 | ssize_t len = 0; |
| 27 | int i; |
| 28 | |
| 29 | for (i = 0; i < MAX_DMA_CHANNELS; i++) { |
| 30 | struct dma_info *info = get_dma_info(i); |
| 31 | struct dma_channel *channel = &info->channels[i]; |
| 32 | |
| 33 | len += sprintf(buf + len, "%2d: %14s %s\n", |
| 34 | channel->chan, info->name, |
| 35 | channel->dev_id); |
| 36 | } |
| 37 | |
| 38 | return len; |
| 39 | } |
| 40 | |
| 41 | static SYSDEV_ATTR(devices, S_IRUGO, dma_show_devices, NULL); |
| 42 | |
| 43 | static int __init dma_sysclass_init(void) |
| 44 | { |
| 45 | int ret; |
| 46 | |
| 47 | ret = sysdev_class_register(&dma_sysclass); |
| 48 | if (ret == 0) |
| 49 | sysfs_create_file(&dma_sysclass.kset.kobj, &attr_devices.attr); |
| 50 | |
| 51 | return ret; |
| 52 | } |
| 53 | |
| 54 | postcore_initcall(dma_sysclass_init); |
| 55 | |
| 56 | static ssize_t dma_show_dev_id(struct sys_device *dev, char *buf) |
| 57 | { |
| 58 | struct dma_channel *channel = to_dma_channel(dev); |
| 59 | return sprintf(buf, "%s\n", channel->dev_id); |
| 60 | } |
| 61 | |
| 62 | static ssize_t dma_store_dev_id(struct sys_device *dev, |
| 63 | const char *buf, size_t count) |
| 64 | { |
| 65 | struct dma_channel *channel = to_dma_channel(dev); |
| 66 | strcpy(channel->dev_id, buf); |
| 67 | return count; |
| 68 | } |
| 69 | |
| 70 | static SYSDEV_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id); |
| 71 | |
| 72 | static ssize_t dma_store_config(struct sys_device *dev, |
| 73 | const char *buf, size_t count) |
| 74 | { |
| 75 | struct dma_channel *channel = to_dma_channel(dev); |
| 76 | unsigned long config; |
| 77 | |
| 78 | config = simple_strtoul(buf, NULL, 0); |
| 79 | dma_configure_channel(channel->chan, config); |
| 80 | |
| 81 | return count; |
| 82 | } |
| 83 | |
| 84 | static SYSDEV_ATTR(config, S_IWUSR, NULL, dma_store_config); |
| 85 | |
| 86 | static ssize_t dma_show_mode(struct sys_device *dev, char *buf) |
| 87 | { |
| 88 | struct dma_channel *channel = to_dma_channel(dev); |
| 89 | return sprintf(buf, "0x%08x\n", channel->mode); |
| 90 | } |
| 91 | |
| 92 | static ssize_t dma_store_mode(struct sys_device *dev, |
| 93 | const char *buf, size_t count) |
| 94 | { |
| 95 | struct dma_channel *channel = to_dma_channel(dev); |
| 96 | channel->mode = simple_strtoul(buf, NULL, 0); |
| 97 | return count; |
| 98 | } |
| 99 | |
| 100 | static SYSDEV_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode); |
| 101 | |
| 102 | #define dma_ro_attr(field, fmt) \ |
| 103 | static ssize_t dma_show_##field(struct sys_device *dev, char *buf) \ |
| 104 | { \ |
| 105 | struct dma_channel *channel = to_dma_channel(dev); \ |
| 106 | return sprintf(buf, fmt, channel->field); \ |
| 107 | } \ |
| 108 | static SYSDEV_ATTR(field, S_IRUGO, dma_show_##field, NULL); |
| 109 | |
| 110 | dma_ro_attr(count, "0x%08x\n"); |
| 111 | dma_ro_attr(flags, "0x%08lx\n"); |
| 112 | |
| 113 | int __init dma_create_sysfs_files(struct dma_channel *chan) |
| 114 | { |
| 115 | struct sys_device *dev = &chan->dev; |
| 116 | int ret; |
| 117 | |
| 118 | dev->id = chan->chan; |
| 119 | dev->cls = &dma_sysclass; |
| 120 | |
| 121 | ret = sysdev_register(dev); |
| 122 | if (ret) |
| 123 | return ret; |
| 124 | |
| 125 | sysdev_create_file(dev, &attr_dev_id); |
| 126 | sysdev_create_file(dev, &attr_count); |
| 127 | sysdev_create_file(dev, &attr_mode); |
| 128 | sysdev_create_file(dev, &attr_flags); |
| 129 | sysdev_create_file(dev, &attr_config); |
| 130 | |
| 131 | return 0; |
| 132 | } |
| 133 | |