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 } 133 134