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 <linux/string.h>
  17 #include <asm/dma.h>
  18
  19 static struct sysdev_class dma_sysclass = {
  20         set_kset_name("dma"),
  21 };
  22
  23 EXPORT_SYMBOL(dma_sysclass);
  24
  25 static ssize_t dma_show_devices(struct sys_device *dev, 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 = &info->channels[i];
  33
  34                 len += sprintf(buf + len, "%2d: %14s    %s\n",
  35                                channel->chan, info->name,
  36                                channel->dev_id);
  37         }
  38
  39         return len;
  40 }
  41
  42 static SYSDEV_ATTR(devices, S_IRUGO, dma_show_devices, NULL);
  43
  44 static int __init dma_sysclass_init(void)
  45 {
  46         int ret;
  47
  48         ret = sysdev_class_register(&dma_sysclass);
  49         if (ret == 0)
  50                 sysfs_create_file(&dma_sysclass.kset.kobj, &attr_devices.attr);
  51
  52         return ret;
  53 }
  54
  55 postcore_initcall(dma_sysclass_init);
  56
  57 static ssize_t dma_show_dev_id(struct sys_device *dev, char *buf)
  58 {
  59         struct dma_channel *channel = to_dma_channel(dev);
  60         return sprintf(buf, "%s\n", channel->dev_id);
  61 }
  62
  63 static ssize_t dma_store_dev_id(struct sys_device *dev,
  64                                 const char *buf, size_t count)
  65 {
  66         struct dma_channel *channel = to_dma_channel(dev);
  67         strcpy(channel->dev_id, buf);
  68         return count;
  69 }
  70
  71 static SYSDEV_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id);
  72
  73 static ssize_t dma_store_config(struct sys_device *dev,
  74                                 const char *buf, size_t count)
  75 {
  76         struct dma_channel *channel = to_dma_channel(dev);
  77         unsigned long config;
  78
  79         config = simple_strtoul(buf, NULL, 0);
  80         dma_configure_channel(channel->chan, config);
  81
  82         return count;
  83 }
  84
  85 static SYSDEV_ATTR(config, S_IWUSR, NULL, dma_store_config);
  86
  87 static ssize_t dma_show_mode(struct sys_device *dev, char *buf)
  88 {
  89         struct dma_channel *channel = to_dma_channel(dev);
  90         return sprintf(buf, "0x%08x\n", channel->mode);
  91 }
  92
  93 static ssize_t dma_store_mode(struct sys_device *dev,
  94                               const char *buf, size_t count)
  95 {
  96         struct dma_channel *channel = to_dma_channel(dev);
  97         channel->mode = simple_strtoul(buf, NULL, 0);
  98         return count;
  99 }
 100
 101 static SYSDEV_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode);
 102
 103 #define dma_ro_attr(field, fmt)                                         \
 104 static ssize_t dma_show_##field(struct sys_device *dev, char *buf)      \
 105 {                                                                       \
 106         struct dma_channel *channel = to_dma_channel(dev);              \
 107         return sprintf(buf, fmt, channel->field);                       \
 108 }                                                                       \
 109 static SYSDEV_ATTR(field, S_IRUGO, dma_show_##field, NULL);
 110
 111 dma_ro_attr(count, "0x%08x\n");
 112 dma_ro_attr(flags, "0x%08lx\n");
 113
 114 int __init dma_create_sysfs_files(struct dma_channel *chan)
 115 {
 116         struct sys_device *dev = &chan->dev;
 117         int ret;
 118
 119         dev->id  = chan->chan;
 120         dev->cls = &dma_sysclass;
 121
 122         ret = sysdev_register(dev);
 123         if (ret)
 124                 return ret;
 125
 126         sysdev_create_file(dev, &attr_dev_id);
 127         sysdev_create_file(dev, &attr_count);
 128         sysdev_create_file(dev, &attr_mode);
 129         sysdev_create_file(dev, &attr_flags);
 130         sysdev_create_file(dev, &attr_config);
 131
 132         return 0;
 133 }
 134