arch/sh/drivers/dma/dma-sysfs.c

   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/err.h>
  17 #include <linux/string.h>
  18 #include <asm/dma.h>
  19
  20 static struct sysdev_class dma_sysclass = {
  21         .name = "dma",
  22 };
  23
  24 static ssize_t dma_show_devices(struct sys_device *dev,
  25                                 struct sysdev_attribute *attr, 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 = get_dma_channel(i);
  33
  34                 if (unlikely(!info) || !channel)
  35                         continue;
  36
  37                 len += sprintf(buf + len, "%2d: %14s    %s\n",
  38                                channel->chan, info->name,
  39                                channel->dev_id);
  40         }
  41
  42         return len;
  43 }
  44
  45 static SYSDEV_ATTR(devices, S_IRUGO, dma_show_devices, NULL);
  46
  47 static int __init dma_sysclass_init(void)
  48 {
  49         int ret;
  50
  51         ret = sysdev_class_register(&dma_sysclass);
  52         if (unlikely(ret))
  53                 return ret;
  54
  55         return sysfs_create_file(&dma_sysclass.kset.kobj, &attr_devices.attr);
  56 }
  57 postcore_initcall(dma_sysclass_init);
  58
  59 static ssize_t dma_show_dev_id(struct sys_device *dev,
  60                                 struct sysdev_attribute *attr, 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                                 struct sysdev_attribute *attr,
  68                                 const char *buf, size_t count)
  69 {
  70         struct dma_channel *channel = to_dma_channel(dev);
  71         strcpy(channel->dev_id, buf);
  72         return count;
  73 }
  74
  75 static SYSDEV_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id);
  76
  77 static ssize_t dma_store_config(struct sys_device *dev,
  78                                 struct sysdev_attribute *attr,
  79                                 const char *buf, size_t count)
  80 {
  81         struct dma_channel *channel = to_dma_channel(dev);
  82         unsigned long config;
  83
  84         config = simple_strtoul(buf, NULL, 0);
  85         dma_configure_channel(channel->vchan, config);
  86
  87         return count;
  88 }
  89
  90 static SYSDEV_ATTR(config, S_IWUSR, NULL, dma_store_config);
  91
  92 static ssize_t dma_show_mode(struct sys_device *dev,
  93                                 struct sysdev_attribute *attr, char *buf)
  94 {
  95         struct dma_channel *channel = to_dma_channel(dev);
  96         return sprintf(buf, "0x%08x\n", channel->mode);
  97 }
  98
  99 static ssize_t dma_store_mode(struct sys_device *dev,
 100                               struct sysdev_attribute *attr,
 101                               const char *buf, size_t count)
 102 {
 103         struct dma_channel *channel = to_dma_channel(dev);
 104         channel->mode = simple_strtoul(buf, NULL, 0);
 105         return count;
 106 }
 107
 108 static SYSDEV_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode);
 109
 110 #define dma_ro_attr(field, fmt)                                         \
 111 static ssize_t dma_show_##field(struct sys_device *dev,                 \
 112                                 struct sysdev_attribute *attr, char *buf)\
 113 {                                                                       \
 114         struct dma_channel *channel = to_dma_channel(dev);              \
 115         return sprintf(buf, fmt, channel->field);                       \
 116 }                                                                       \
 117 static SYSDEV_ATTR(field, S_IRUGO, dma_show_##field, NULL);
 118
 119 dma_ro_attr(count, "0x%08x\n");
 120 dma_ro_attr(flags, "0x%08lx\n");
 121
 122 int dma_create_sysfs_files(struct dma_channel *chan, struct dma_info *info)
 123 {
 124         struct sys_device *dev = &chan->dev;
 125         char name[16];
 126         int ret;
 127
 128         dev->id  = chan->vchan;
 129         dev->cls = &dma_sysclass;
 130
 131         ret = sysdev_register(dev);
 132         if (ret)
 133                 return ret;
 134
 135         ret |= sysdev_create_file(dev, &attr_dev_id);
 136         ret |= sysdev_create_file(dev, &attr_count);
 137         ret |= sysdev_create_file(dev, &attr_mode);
 138         ret |= sysdev_create_file(dev, &attr_flags);
 139         ret |= sysdev_create_file(dev, &attr_config);
 140
 141         if (unlikely(ret)) {
 142                 dev_err(&info->pdev->dev, "Failed creating attrs\n");
 143                 return ret;
 144         }
 145
 146         snprintf(name, sizeof(name), "dma%d", chan->chan);
 147         return sysfs_create_link(&info->pdev->dev.kobj, &dev->kobj, name);
 148 }
 149
 150 void dma_remove_sysfs_files(struct dma_channel *chan, struct dma_info *info)
 151 {
 152         struct sys_device *dev = &chan->dev;
 153         char name[16];
 154
 155         sysdev_remove_file(dev, &attr_dev_id);
 156         sysdev_remove_file(dev, &attr_count);
 157         sysdev_remove_file(dev, &attr_mode);
 158         sysdev_remove_file(dev, &attr_flags);
 159         sysdev_remove_file(dev, &attr_config);
 160
 161         snprintf(name, sizeof(name), "dma%d", chan->chan);
 162         sysfs_remove_link(&info->pdev->dev.kobj, name);
 163
 164         sysdev_unregister(dev);
 165 }