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/stat.h> 15 #include <linux/sysdev.h> 16 #include <linux/platform_device.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 .name = "dma", 23 }; 24 25 static ssize_t dma_show_devices(struct sys_device *dev, 26 struct sysdev_attribute *attr, char *buf) 27 { 28 ssize_t len = 0; 29 int i; 30 31 for (i = 0; i < MAX_DMA_CHANNELS; i++) { 32 struct dma_info *info = get_dma_info(i); 33 struct dma_channel *channel = get_dma_channel(i); 34 35 if (unlikely(!info) || !channel) 36 continue; 37 38 len += sprintf(buf + len, "%2d: %14s %s\n", 39 channel->chan, info->name, 40 channel->dev_id); 41 } 42 43 return len; 44 } 45 46 static SYSDEV_ATTR(devices, S_IRUGO, dma_show_devices, NULL); 47 48 static int __init dma_sysclass_init(void) 49 { 50 int ret; 51 52 ret = sysdev_class_register(&dma_sysclass); 53 if (unlikely(ret)) 54 return ret; 55 56 return sysfs_create_file(&dma_sysclass.kset.kobj, &attr_devices.attr); 57 } 58 postcore_initcall(dma_sysclass_init); 59 60 static ssize_t dma_show_dev_id(struct sys_device *dev, 61 struct sysdev_attribute *attr, char *buf) 62 { 63 struct dma_channel *channel = to_dma_channel(dev); 64 return sprintf(buf, "%s\n", channel->dev_id); 65 } 66 67 static ssize_t dma_store_dev_id(struct sys_device *dev, 68 struct sysdev_attribute *attr, 69 const char *buf, size_t count) 70 { 71 struct dma_channel *channel = to_dma_channel(dev); 72 strcpy(channel->dev_id, buf); 73 return count; 74 } 75 76 static SYSDEV_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id); 77 78 static ssize_t dma_store_config(struct sys_device *dev, 79 struct sysdev_attribute *attr, 80 const char *buf, size_t count) 81 { 82 struct dma_channel *channel = to_dma_channel(dev); 83 unsigned long config; 84 85 config = simple_strtoul(buf, NULL, 0); 86 dma_configure_channel(channel->vchan, config); 87 88 return count; 89 } 90 91 static SYSDEV_ATTR(config, S_IWUSR, NULL, dma_store_config); 92 93 static ssize_t dma_show_mode(struct sys_device *dev, 94 struct sysdev_attribute *attr, char *buf) 95 { 96 struct dma_channel *channel = to_dma_channel(dev); 97 return sprintf(buf, "0x%08x\n", channel->mode); 98 } 99 100 static ssize_t dma_store_mode(struct sys_device *dev, 101 struct sysdev_attribute *attr, 102 const char *buf, size_t count) 103 { 104 struct dma_channel *channel = to_dma_channel(dev); 105 channel->mode = simple_strtoul(buf, NULL, 0); 106 return count; 107 } 108 109 static SYSDEV_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode); 110 111 #define dma_ro_attr(field, fmt) \ 112 static ssize_t dma_show_##field(struct sys_device *dev, \ 113 struct sysdev_attribute *attr, char *buf)\ 114 { \ 115 struct dma_channel *channel = to_dma_channel(dev); \ 116 return sprintf(buf, fmt, channel->field); \ 117 } \ 118 static SYSDEV_ATTR(field, S_IRUGO, dma_show_##field, NULL); 119 120 dma_ro_attr(count, "0x%08x\n"); 121 dma_ro_attr(flags, "0x%08lx\n"); 122 123 int dma_create_sysfs_files(struct dma_channel *chan, struct dma_info *info) 124 { 125 struct sys_device *dev = &chan->dev; 126 char name[16]; 127 int ret; 128 129 dev->id = chan->vchan; 130 dev->cls = &dma_sysclass; 131 132 ret = sysdev_register(dev); 133 if (ret) 134 return ret; 135 136 ret |= sysdev_create_file(dev, &attr_dev_id); 137 ret |= sysdev_create_file(dev, &attr_count); 138 ret |= sysdev_create_file(dev, &attr_mode); 139 ret |= sysdev_create_file(dev, &attr_flags); 140 ret |= sysdev_create_file(dev, &attr_config); 141 142 if (unlikely(ret)) { 143 dev_err(&info->pdev->dev, "Failed creating attrs\n"); 144 return ret; 145 } 146 147 snprintf(name, sizeof(name), "dma%d", chan->chan); 148 return sysfs_create_link(&info->pdev->dev.kobj, &dev->kobj, name); 149 } 150 151 void dma_remove_sysfs_files(struct dma_channel *chan, struct dma_info *info) 152 { 153 struct sys_device *dev = &chan->dev; 154 char name[16]; 155 156 sysdev_remove_file(dev, &attr_dev_id); 157 sysdev_remove_file(dev, &attr_count); 158 sysdev_remove_file(dev, &attr_mode); 159 sysdev_remove_file(dev, &attr_flags); 160 sysdev_remove_file(dev, &attr_config); 161 162 snprintf(name, sizeof(name), "dma%d", chan->chan); 163 sysfs_remove_link(&info->pdev->dev.kobj, name); 164 165 sysdev_unregister(dev); 166 } 167