target/linux/generic/patches-3.13/555-gluebi-sysfs-support.patch

   1 --- a/drivers/mtd/ubi/gluebi.c
   2 +++ b/drivers/mtd/ubi/gluebi.c
   3 @@ -38,6 +38,7 @@
   4  #include <linux/mutex.h>
   5  #include <linux/mtd/ubi.h>
   6  #include <linux/mtd/mtd.h>
   7 +#include <linux/export.h>
   8  #include "ubi-media.h"
   9
  10  #define err_msg(fmt, ...)                                   \
  11 @@ -66,6 +67,16 @@ struct gluebi_device {
  12  static LIST_HEAD(gluebi_devices);
  13  static DEFINE_MUTEX(devices_mutex);
  14
  15 +/* Device attribute handler for gluebi files in '/<sysfs>/class/mtd/mtdX' */
  16 +static ssize_t gluebi_attribute_show(struct device *dev,
  17 +       struct device_attribute *attr, char *buf);
  18 +
  19 +/* Device attributes corresponding to files in '/<sysfs>/class/mtd/mtdX' */
  20 +static struct device_attribute attr_vol_gluebi_ubi_num =
  21 +__ATTR(gluebi_ubi_num, S_IRUGO, gluebi_attribute_show, NULL);
  22 +static struct device_attribute attr_vol_gluebi_vol_id =
  23 +__ATTR(gluebi_vol_id, S_IRUGO, gluebi_attribute_show, NULL);
  24 +
  25  /**
  26   * find_gluebi_nolock - find a gluebi device.
  27   * @ubi_num: UBI device number
  28 @@ -288,6 +299,36 @@ out_err:
  29  }
  30
  31  /**
  32 + * gluebi_attribute_show - "Show" method for gluebi files in sysfs.
  33 + */
  34 +static ssize_t gluebi_attribute_show(struct device *dev,
  35 +                                 struct device_attribute *attr, char *buf)
  36 +{
  37 +       int ret;
  38 +       struct mtd_info *mtd = container_of(dev, struct mtd_info, dev);
  39 +       struct gluebi_device *gluebi;
  40 +
  41 +       gluebi_get_device(mtd);
  42 +       gluebi = container_of(mtd, struct gluebi_device, mtd);
  43 +
  44 +       /* This really shouldn't happen */
  45 +       if (!gluebi)
  46 +               return -ENODEV;
  47 +
  48 +       if (attr == &attr_vol_gluebi_ubi_num) {
  49 +               ret = sprintf(buf, "%u\n", gluebi->ubi_num);
  50 +       } else if (attr == &attr_vol_gluebi_vol_id) {
  51 +               ret = sprintf(buf, "%u\n", gluebi->vol_id);
  52 +       } else {
  53 +               /* This must be a bug */
  54 +               ret = -EINVAL;
  55 +       }
  56 +
  57 +       gluebi_put_device(mtd);
  58 +       return ret;
  59 +}
  60 +
  61 +/**
  62   * gluebi_create - create a gluebi device for an UBI volume.
  63   * @di: UBI device description object
  64   * @vi: UBI volume description object
  65 @@ -355,6 +396,8 @@ static int gluebi_create(struct ubi_devi
  66         mutex_lock(&devices_mutex);
  67         list_add_tail(&gluebi->list, &gluebi_devices);
  68         mutex_unlock(&devices_mutex);
  69 +       device_create_file(&mtd->dev, &attr_vol_gluebi_ubi_num);
  70 +       device_create_file(&mtd->dev, &attr_vol_gluebi_vol_id);
  71         return 0;
  72  }
  73
  74 @@ -380,8 +423,11 @@ static int gluebi_remove(struct ubi_volu
  75                 err = -ENOENT;
  76         } else if (gluebi->refcnt)
  77                 err = -EBUSY;
  78 -       else
  79 +       else {
  80 +               device_remove_file(&gluebi->mtd.dev, &attr_vol_gluebi_ubi_num);
  81 +               device_remove_file(&gluebi->mtd.dev, &attr_vol_gluebi_vol_id);
  82                 list_del(&gluebi->list);
  83 +       }
  84         mutex_unlock(&devices_mutex);
  85         if (err)
  86                 return err;