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