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/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 }