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/err.h> 17#include <linux/string.h> 18#include <asm/dma.h> 19 20static struct sysdev_class dma_sysclass = { 21 .name = "dma", 22}; 23 24static ssize_t dma_show_devices(struct sys_device *dev, 25 struct sysdev_attribute *attr, 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 = get_dma_channel(i); 33 34 if (unlikely(!info) || !channel) 35 continue; 36 37 len += sprintf(buf + len, "%2d: %14s %s\n", 38 channel->chan, info->name, 39 channel->dev_id); 40 } 41 42 return len; 43} 44 45static SYSDEV_ATTR(devices, S_IRUGO, dma_show_devices, NULL); 46 47static int __init dma_sysclass_init(void) 48{ 49 int ret; 50 51 ret = sysdev_class_register(&dma_sysclass); 52 if (unlikely(ret)) 53 return ret; 54 55 return sysfs_create_file(&dma_sysclass.kset.kobj, &attr_devices.attr); 56} 57postcore_initcall(dma_sysclass_init); 58 59static ssize_t dma_show_dev_id(struct sys_device *dev, 60 struct sysdev_attribute *attr, char *buf) 61{ 62 struct dma_channel *channel = to_dma_channel(dev); 63 return sprintf(buf, "%s\n", channel->dev_id); 64} 65 66static ssize_t dma_store_dev_id(struct sys_device *dev, 67 struct sysdev_attribute *attr, 68 const char *buf, size_t count) 69{ 70 struct dma_channel *channel = to_dma_channel(dev); 71 strcpy(channel->dev_id, buf); 72 return count; 73} 74 75static SYSDEV_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id); 76 77static ssize_t dma_store_config(struct sys_device *dev, 78 struct sysdev_attribute *attr, 79 const char *buf, size_t count) 80{ 81 struct dma_channel *channel = to_dma_channel(dev); 82 unsigned long config; 83 84 config = simple_strtoul(buf, NULL, 0); 85 dma_configure_channel(channel->vchan, config); 86 87 return count; 88} 89 90static SYSDEV_ATTR(config, S_IWUSR, NULL, dma_store_config); 91 92static ssize_t dma_show_mode(struct sys_device *dev, 93 struct sysdev_attribute *attr, char *buf) 94{ 95 struct dma_channel *channel = to_dma_channel(dev); 96 return sprintf(buf, "0x%08x\n", channel->mode); 97} 98 99static ssize_t dma_store_mode(struct sys_device *dev, 100 struct sysdev_attribute *attr, 101 const char *buf, size_t count) 102{ 103 struct dma_channel *channel = to_dma_channel(dev); 104 channel->mode = simple_strtoul(buf, NULL, 0); 105 return count; 106} 107 108static SYSDEV_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode); 109 110#define dma_ro_attr(field, fmt) \ 111static ssize_t dma_show_##field(struct sys_device *dev, \ 112 struct sysdev_attribute *attr, char *buf)\ 113{ \ 114 struct dma_channel *channel = to_dma_channel(dev); \ 115 return sprintf(buf, fmt, channel->field); \ 116} \ 117static SYSDEV_ATTR(field, S_IRUGO, dma_show_##field, NULL); 118 119dma_ro_attr(count, "0x%08x\n"); 120dma_ro_attr(flags, "0x%08lx\n"); 121 122int dma_create_sysfs_files(struct dma_channel *chan, struct dma_info *info) 123{ 124 struct sys_device *dev = &chan->dev; 125 char name[16]; 126 int ret; 127 128 dev->id = chan->vchan; 129 dev->cls = &dma_sysclass; 130 131 ret = sysdev_register(dev); 132 if (ret) 133 return ret; 134 135 ret |= sysdev_create_file(dev, &attr_dev_id); 136 ret |= sysdev_create_file(dev, &attr_count); 137 ret |= sysdev_create_file(dev, &attr_mode); 138 ret |= sysdev_create_file(dev, &attr_flags); 139 ret |= sysdev_create_file(dev, &attr_config); 140 141 if (unlikely(ret)) { 142 dev_err(&info->pdev->dev, "Failed creating attrs\n"); 143 return ret; 144 } 145 146 snprintf(name, sizeof(name), "dma%d", chan->chan); 147 return sysfs_create_link(&info->pdev->dev.kobj, &dev->kobj, name); 148} 149 150void dma_remove_sysfs_files(struct dma_channel *chan, struct dma_info *info) 151{ 152 struct sys_device *dev = &chan->dev; 153 char name[16]; 154 155 sysdev_remove_file(dev, &attr_dev_id); 156 sysdev_remove_file(dev, &attr_count); 157 sysdev_remove_file(dev, &attr_mode); 158 sysdev_remove_file(dev, &attr_flags); 159 sysdev_remove_file(dev, &attr_config); 160 161 snprintf(name, sizeof(name), "dma%d", chan->chan); 162 sysfs_remove_link(&info->pdev->dev.kobj, name); 163 164 sysdev_unregister(dev); 165} 166