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/stat.h>
  15 #include <linux/sysdev.h>
  16 #include <linux/platform_device.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
  25 static ssize_t dma_show_devices(struct sys_device *dev,
  26                                 struct sysdev_attribute *attr, 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,
  61                                 struct sysdev_attribute *attr, char *buf)
  62 {
  63         struct dma_channel *channel = to_dma_channel(dev);
  64         return sprintf(buf, "%s\n", channel->dev_id);
  65 }
  66
  67 static ssize_t dma_store_dev_id(struct sys_device *dev,
  68                                 struct sysdev_attribute *attr,
  69                                 const char *buf, size_t count)
  70 {
  71         struct dma_channel *channel = to_dma_channel(dev);
  72         strcpy(channel->dev_id, buf);
  73         return count;
  74 }
  75
  76 static SYSDEV_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id);
  77
  78 static ssize_t dma_store_config(struct sys_device *dev,
  79                                 struct sysdev_attribute *attr,
  80                                 const char *buf, size_t count)
  81 {
  82         struct dma_channel *channel = to_dma_channel(dev);
  83         unsigned long config;
  84
  85         config = simple_strtoul(buf, NULL, 0);
  86         dma_configure_channel(channel->vchan, config);
  87
  88         return count;
  89 }
  90
  91 static SYSDEV_ATTR(config, S_IWUSR, NULL, dma_store_config);
  92
  93 static ssize_t dma_show_mode(struct sys_device *dev,
  94                                 struct sysdev_attribute *attr, char *buf)
  95 {
  96         struct dma_channel *channel = to_dma_channel(dev);
  97         return sprintf(buf, "0x%08x\n", channel->mode);
  98 }
  99
 100 static ssize_t dma_store_mode(struct sys_device *dev,
 101                               struct sysdev_attribute *attr,
 102                               const char *buf, size_t count)
 103 {
 104         struct dma_channel *channel = to_dma_channel(dev);
 105         channel->mode = simple_strtoul(buf, NULL, 0);
 106         return count;
 107 }
 108
 109 static SYSDEV_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode);
 110
 111 #define dma_ro_attr(field, fmt)                                         \
 112 static ssize_t dma_show_##field(struct sys_device *dev,                 \
 113                                 struct sysdev_attribute *attr, char *buf)\
 114 {                                                                       \
 115         struct dma_channel *channel = to_dma_channel(dev);              \
 116         return sprintf(buf, fmt, channel->field);                       \
 117 }                                                                       \
 118 static SYSDEV_ATTR(field, S_IRUGO, dma_show_##field, NULL);
 119
 120 dma_ro_attr(count, "0x%08x\n");
 121 dma_ro_attr(flags, "0x%08lx\n");
 122
 123 int dma_create_sysfs_files(struct dma_channel *chan, struct dma_info *info)
 124 {
 125         struct sys_device *dev = &chan->dev;
 126         char name[16];
 127         int ret;
 128
 129         dev->id  = chan->vchan;
 130         dev->cls = &dma_sysclass;
 131
 132         ret = sysdev_register(dev);
 133         if (ret)
 134                 return ret;
 135
 136         ret |= sysdev_create_file(dev, &attr_dev_id);
 137         ret |= sysdev_create_file(dev, &attr_count);
 138         ret |= sysdev_create_file(dev, &attr_mode);
 139         ret |= sysdev_create_file(dev, &attr_flags);
 140         ret |= sysdev_create_file(dev, &attr_config);
 141
 142         if (unlikely(ret)) {
 143                 dev_err(&info->pdev->dev, "Failed creating attrs\n");
 144                 return ret;
 145         }
 146
 147         snprintf(name, sizeof(name), "dma%d", chan->chan);
 148         return sysfs_create_link(&info->pdev->dev.kobj, &dev->kobj, name);
 149 }
 150
 151 void dma_remove_sysfs_files(struct dma_channel *chan, struct dma_info *info)
 152 {
 153         struct sys_device *dev = &chan->dev;
 154         char name[16];
 155
 156         sysdev_remove_file(dev, &attr_dev_id);
 157         sysdev_remove_file(dev, &attr_count);
 158         sysdev_remove_file(dev, &attr_mode);
 159         sysdev_remove_file(dev, &attr_flags);
 160         sysdev_remove_file(dev, &attr_config);
 161
 162         snprintf(name, sizeof(name), "dma%d", chan->chan);
 163         sysfs_remove_link(&info->pdev->dev.kobj, name);
 164
 165         sysdev_unregister(dev);
 166 }