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/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 .name = "dma", 23 }; 24 EXPORT_SYMBOL(dma_sysclass); 25 26 static ssize_t dma_show_devices(struct sys_device *dev, 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, char *buf) 61 { 62 struct dma_channel *channel = to_dma_channel(dev); 63 return sprintf(buf, "%s\n", channel->dev_id); 64 } 65 66 static ssize_t dma_store_dev_id(struct sys_device *dev, 67 const char *buf, size_t count) 68 { 69 struct dma_channel *channel = to_dma_channel(dev); 70 strcpy(channel->dev_id, buf); 71 return count; 72 } 73 74 static SYSDEV_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id); 75 76 static ssize_t dma_store_config(struct sys_device *dev, 77 const char *buf, size_t count) 78 { 79 struct dma_channel *channel = to_dma_channel(dev); 80 unsigned long config; 81 82 config = simple_strtoul(buf, NULL, 0); 83 dma_configure_channel(channel->vchan, config); 84 85 return count; 86 } 87 88 static SYSDEV_ATTR(config, S_IWUSR, NULL, dma_store_config); 89 90 static ssize_t dma_show_mode(struct sys_device *dev, char *buf) 91 { 92 struct dma_channel *channel = to_dma_channel(dev); 93 return sprintf(buf, "0x%08x\n", channel->mode); 94 } 95 96 static ssize_t dma_store_mode(struct sys_device *dev, 97 const char *buf, size_t count) 98 { 99 struct dma_channel *channel = to_dma_channel(dev); 100 channel->mode = simple_strtoul(buf, NULL, 0); 101 return count; 102 } 103 104 static SYSDEV_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode); 105 106 #define dma_ro_attr(field, fmt) \ 107 static ssize_t dma_show_##field(struct sys_device *dev, char *buf) \ 108 { \ 109 struct dma_channel *channel = to_dma_channel(dev); \ 110 return sprintf(buf, fmt, channel->field); \ 111 } \ 112 static SYSDEV_ATTR(field, S_IRUGO, dma_show_##field, NULL); 113 114 dma_ro_attr(count, "0x%08x\n"); 115 dma_ro_attr(flags, "0x%08lx\n"); 116 117 int dma_create_sysfs_files(struct dma_channel *chan, struct dma_info *info) 118 { 119 struct sys_device *dev = &chan->dev; 120 char name[16]; 121 int ret; 122 123 dev->id = chan->vchan; 124 dev->cls = &dma_sysclass; 125 126 ret = sysdev_register(dev); 127 if (ret) 128 return ret; 129 130 ret |= sysdev_create_file(dev, &attr_dev_id); 131 ret |= sysdev_create_file(dev, &attr_count); 132 ret |= sysdev_create_file(dev, &attr_mode); 133 ret |= sysdev_create_file(dev, &attr_flags); 134 ret |= sysdev_create_file(dev, &attr_config); 135 136 if (unlikely(ret)) { 137 dev_err(&info->pdev->dev, "Failed creating attrs\n"); 138 return ret; 139 } 140 141 snprintf(name, sizeof(name), "dma%d", chan->chan); 142 return sysfs_create_link(&info->pdev->dev.kobj, &dev->kobj, name); 143 } 144 145 void dma_remove_sysfs_files(struct dma_channel *chan, struct dma_info *info) 146 { 147 struct sys_device *dev = &chan->dev; 148 char name[16]; 149 150 sysdev_remove_file(dev, &attr_dev_id); 151 sysdev_remove_file(dev, &attr_count); 152 sysdev_remove_file(dev, &attr_mode); 153 sysdev_remove_file(dev, &attr_flags); 154 sysdev_remove_file(dev, &attr_config); 155 156 snprintf(name, sizeof(name), "dma%d", chan->chan); 157 sysfs_remove_link(&info->pdev->dev.kobj, name); 158 159 sysdev_unregister(dev); 160 } 161