1 /* 2 * arch/sh/drivers/dma/dma-sysfs.c 3 * 4 * sysfs interface for SH DMA API 5 * 6 * Copyright (C) 2004, 2005 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/module.h> 17 #include <linux/err.h> 18 #include <linux/string.h> 19 #include <asm/dma.h> 20 21 static struct sysdev_class dma_sysclass = { 22 set_kset_name("dma"), 23 }; 24 25 EXPORT_SYMBOL(dma_sysclass); 26 27 static ssize_t dma_show_devices(struct sys_device *dev, char *buf) 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); 34 struct dma_channel *channel = &info->channels[i]; 35 36 len += sprintf(buf + len, "%2d: %14s %s\n", 37 channel->chan, info->name, 38 channel->dev_id); 39 } 40 41 return len; 42 } 43 44 static SYSDEV_ATTR(devices, S_IRUGO, dma_show_devices, NULL); 45 46 static int __init dma_sysclass_init(void) 47 { 48 int ret; 49 50 ret = sysdev_class_register(&dma_sysclass); 51 if (ret == 0) 52 sysfs_create_file(&dma_sysclass.kset.kobj, &attr_devices.attr); 53 54 return ret; 55 } 56 57 postcore_initcall(dma_sysclass_init); 58 59 static ssize_t dma_show_dev_id(struct sys_device *dev, char *buf) 60 { 61 struct dma_channel *channel = to_dma_channel(dev); 62 return sprintf(buf, "%s\n", channel->dev_id); 63 } 64 65 static ssize_t dma_store_dev_id(struct sys_device *dev, 66 const char *buf, size_t count) 67 { 68 struct dma_channel *channel = to_dma_channel(dev); 69 strcpy(channel->dev_id, buf); 70 return count; 71 } 72 73 static SYSDEV_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id); 74 75 static ssize_t dma_store_config(struct sys_device *dev, 76 const char *buf, size_t count) 77 { 78 struct dma_channel *channel = to_dma_channel(dev); 79 unsigned long config; 80 81 config = simple_strtoul(buf, NULL, 0); 82 dma_configure_channel(channel->vchan, config); 83 84 return count; 85 } 86 87 static SYSDEV_ATTR(config, S_IWUSR, NULL, dma_store_config); 88 89 static ssize_t dma_show_mode(struct sys_device *dev, char *buf) 90 { 91 struct dma_channel *channel = to_dma_channel(dev); 92 return sprintf(buf, "0x%08x\n", channel->mode); 93 } 94 95 static ssize_t dma_store_mode(struct sys_device *dev, 96 const char *buf, size_t count) 97 { 98 struct dma_channel *channel = to_dma_channel(dev); 99 channel->mode = simple_strtoul(buf, NULL, 0); 100 return count; 101 } 102 103 static SYSDEV_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode); 104 105 #define dma_ro_attr(field, fmt) \ 106 static ssize_t dma_show_##field(struct sys_device *dev, char *buf) \ 107 { \ 108 struct dma_channel *channel = to_dma_channel(dev); \ 109 return sprintf(buf, fmt, channel->field); \ 110 } \ 111 static SYSDEV_ATTR(field, S_IRUGO, dma_show_##field, NULL); 112 113 dma_ro_attr(count, "0x%08x\n"); 114 dma_ro_attr(flags, "0x%08lx\n"); 115 116 int dma_create_sysfs_files(struct dma_channel *chan, struct dma_info *info) 117 { 118 struct sys_device *dev = &chan->dev; 119 char name[16]; 120 int ret; 121 122 dev->id = chan->vchan; 123 dev->cls = &dma_sysclass; 124 125 ret = sysdev_register(dev); 126 if (ret) 127 return ret; 128 129 sysdev_create_file(dev, &attr_dev_id); 130 sysdev_create_file(dev, &attr_count); 131 sysdev_create_file(dev, &attr_mode); 132 sysdev_create_file(dev, &attr_flags); 133 sysdev_create_file(dev, &attr_config); 134 135 snprintf(name, sizeof(name), "dma%d", chan->chan); 136 return sysfs_create_link(&info->pdev->dev.kobj, &dev->kobj, name); 137 } 138 139 void dma_remove_sysfs_files(struct dma_channel *chan, struct dma_info *info) 140 { 141 struct sys_device *dev = &chan->dev; 142 char name[16]; 143 144 sysdev_remove_file(dev, &attr_dev_id); 145 sysdev_remove_file(dev, &attr_count); 146 sysdev_remove_file(dev, &attr_mode); 147 sysdev_remove_file(dev, &attr_flags); 148 sysdev_remove_file(dev, &attr_config); 149 150 snprintf(name, sizeof(name), "dma%d", chan->chan); 151 sysfs_remove_link(&info->pdev->dev.kobj, name); 152 153 sysdev_unregister(dev); 154 } 155 156