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  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/module.h>
  16 #include <asm/dma.h>
  17
  18 static struct sysdev_class dma_sysclass = {
  19         set_kset_name("dma"),
  20 };
  21
  22 EXPORT_SYMBOL(dma_sysclass);
  23
  24 static ssize_t dma_show_devices(struct sys_device *dev, char *buf)
  25 {
  26         ssize_t len = 0;
  27         int i;
  28
  29         for (i = 0; i < MAX_DMA_CHANNELS; i++) {
  30                 struct dma_info *info = get_dma_info(i);
  31                 struct dma_channel *channel = &info->channels[i];
  32
  33                 len += sprintf(buf + len, "%2d: %14s    %s\n",
  34                                channel->chan, info->name,
  35                                channel->dev_id);
  36         }
  37
  38         return len;
  39 }
  40
  41 static SYSDEV_ATTR(devices, S_IRUGO, dma_show_devices, NULL);
  42
  43 static int __init dma_sysclass_init(void)
  44 {
  45         int ret;
  46
  47         ret = sysdev_class_register(&dma_sysclass);
  48         if (ret == 0)
  49                 sysfs_create_file(&dma_sysclass.kset.kobj, &attr_devices.attr);
  50
  51         return ret;
  52 }
  53
  54 postcore_initcall(dma_sysclass_init);
  55
  56 static ssize_t dma_show_dev_id(struct sys_device *dev, char *buf)
  57 {
  58         struct dma_channel *channel = to_dma_channel(dev);
  59         return sprintf(buf, "%s\n", channel->dev_id);
  60 }
  61
  62 static ssize_t dma_store_dev_id(struct sys_device *dev,
  63                                 const char *buf, size_t count)
  64 {
  65         struct dma_channel *channel = to_dma_channel(dev);
  66         strcpy(channel->dev_id, buf);
  67         return count;
  68 }
  69
  70 static SYSDEV_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id);
  71
  72 static ssize_t dma_store_config(struct sys_device *dev,
  73                                 const char *buf, size_t count)
  74 {
  75         struct dma_channel *channel = to_dma_channel(dev);
  76         unsigned long config;
  77
  78         config = simple_strtoul(buf, NULL, 0);
  79         dma_configure_channel(channel->chan, config);
  80
  81         return count;
  82 }
  83
  84 static SYSDEV_ATTR(config, S_IWUSR, NULL, dma_store_config);
  85
  86 static ssize_t dma_show_mode(struct sys_device *dev, char *buf)
  87 {
  88         struct dma_channel *channel = to_dma_channel(dev);
  89         return sprintf(buf, "0x%08x\n", channel->mode);
  90 }
  91
  92 static ssize_t dma_store_mode(struct sys_device *dev,
  93                               const char *buf, size_t count)
  94 {
  95         struct dma_channel *channel = to_dma_channel(dev);
  96         channel->mode = simple_strtoul(buf, NULL, 0);
  97         return count;
  98 }
  99
 100 static SYSDEV_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode);
 101
 102 #define dma_ro_attr(field, fmt)                                         \
 103 static ssize_t dma_show_##field(struct sys_device *dev, char *buf)      \
 104 {                                                                       \
 105         struct dma_channel *channel = to_dma_channel(dev);              \
 106         return sprintf(buf, fmt, channel->field);                       \
 107 }                                                                       \
 108 static SYSDEV_ATTR(field, S_IRUGO, dma_show_##field, NULL);
 109
 110 dma_ro_attr(count, "0x%08x\n");
 111 dma_ro_attr(flags, "0x%08lx\n");
 112
 113 int __init dma_create_sysfs_files(struct dma_channel *chan)
 114 {
 115         struct sys_device *dev = &chan->dev;
 116         int ret;
 117
 118         dev->id  = chan->chan;
 119         dev->cls = &dma_sysclass;
 120
 121         ret = sysdev_register(dev);
 122         if (ret)
 123                 return ret;
 124
 125         sysdev_create_file(dev, &attr_dev_id);
 126         sysdev_create_file(dev, &attr_count);
 127         sysdev_create_file(dev, &attr_mode);
 128         sysdev_create_file(dev, &attr_flags);
 129         sysdev_create_file(dev, &attr_config);
 130
 131         return 0;
 132 }
 133