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, 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 (unlikely(ret))
  52                 return ret;
  53
  54         return sysfs_create_file(&dma_sysclass.kset.kobj, &attr_devices.attr);
  55 }
  56 postcore_initcall(dma_sysclass_init);
  57
  58 static ssize_t dma_show_dev_id(struct sys_device *dev, char *buf)
  59 {
  60         struct dma_channel *channel = to_dma_channel(dev);
  61         return sprintf(buf, "%s\n", channel->dev_id);
  62 }
  63
  64 static ssize_t dma_store_dev_id(struct sys_device *dev,
  65                                 const char *buf, size_t count)
  66 {
  67         struct dma_channel *channel = to_dma_channel(dev);
  68         strcpy(channel->dev_id, buf);
  69         return count;
  70 }
  71
  72 static SYSDEV_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id);
  73
  74 static ssize_t dma_store_config(struct sys_device *dev,
  75                                 const char *buf, size_t count)
  76 {
  77         struct dma_channel *channel = to_dma_channel(dev);
  78         unsigned long config;
  79
  80         config = simple_strtoul(buf, NULL, 0);
  81         dma_configure_channel(channel->vchan, config);
  82
  83         return count;
  84 }
  85
  86 static SYSDEV_ATTR(config, S_IWUSR, NULL, dma_store_config);
  87
  88 static ssize_t dma_show_mode(struct sys_device *dev, char *buf)
  89 {
  90         struct dma_channel *channel = to_dma_channel(dev);
  91         return sprintf(buf, "0x%08x\n", channel->mode);
  92 }
  93
  94 static ssize_t dma_store_mode(struct sys_device *dev,
  95                               const char *buf, size_t count)
  96 {
  97         struct dma_channel *channel = to_dma_channel(dev);
  98         channel->mode = simple_strtoul(buf, NULL, 0);
  99         return count;
 100 }
 101
 102 static SYSDEV_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode);
 103
 104 #define dma_ro_attr(field, fmt)                                         \
 105 static ssize_t dma_show_##field(struct sys_device *dev, char *buf)      \
 106 {                                                                       \
 107         struct dma_channel *channel = to_dma_channel(dev);              \
 108         return sprintf(buf, fmt, channel->field);                       \
 109 }                                                                       \
 110 static SYSDEV_ATTR(field, S_IRUGO, dma_show_##field, NULL);
 111
 112 dma_ro_attr(count, "0x%08x\n");
 113 dma_ro_attr(flags, "0x%08lx\n");
 114
 115 int dma_create_sysfs_files(struct dma_channel *chan, struct dma_info *info)
 116 {
 117         struct sys_device *dev = &chan->dev;
 118         char name[16];
 119         int ret;
 120
 121         dev->id  = chan->vchan;
 122         dev->cls = &dma_sysclass;
 123
 124         ret = sysdev_register(dev);
 125         if (ret)
 126                 return ret;
 127
 128         sysdev_create_file(dev, &attr_dev_id);
 129         sysdev_create_file(dev, &attr_count);
 130         sysdev_create_file(dev, &attr_mode);
 131         sysdev_create_file(dev, &attr_flags);
 132         sysdev_create_file(dev, &attr_config);
 133
 134         snprintf(name, sizeof(name), "dma%d", chan->chan);
 135         return sysfs_create_link(&info->pdev->dev.kobj, &dev->kobj, name);
 136 }
 137
 138 void dma_remove_sysfs_files(struct dma_channel *chan, struct dma_info *info)
 139 {
 140         struct sys_device *dev = &chan->dev;
 141         char name[16];
 142
 143         sysdev_remove_file(dev, &attr_dev_id);
 144         sysdev_remove_file(dev, &attr_count);
 145         sysdev_remove_file(dev, &attr_mode);
 146         sysdev_remove_file(dev, &attr_flags);
 147         sysdev_remove_file(dev, &attr_config);
 148
 149         snprintf(name, sizeof(name), "dma%d", chan->chan);
 150         sysfs_remove_link(&info->pdev->dev.kobj, name);
 151
 152         sysdev_unregister(dev);
 153 }