recipes/linux/linux-efika-2.6.20/0015-powerpc-Add-a-unified-uevent-handler-for-bus-based-on-of_device.txt

   1 From 90dc591d4c897c7a49191888c1e4d413cc08b8b7 Mon Sep 17 00:00:00 2001
   2 From: Sylvain Munaut <tnt@246tNt.com>
   3 Date: Sat, 23 Dec 2006 23:08:56 +0100
   4 Subject: [PATCH] [PATCH] powerpc: Add a unified uevent handler for bus based on of_device
   5
   6 This common uevent handler allow the several bus types based on
   7 of_device to generate the uevent properly and avoiding
   8 code duplication.
   9
  10 This handlers take a struct device as argument and can therefore
  11 be used as the uevent call directly if no special treatment is
  12 needed for the bus.
  13
  14 Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
  15 ---
  16  arch/powerpc/kernel/of_device.c |   66 +++++++++++++++++++++++++++++++++++++++
  17  include/asm-powerpc/of_device.h |    3 ++
  18  2 files changed, 69 insertions(+), 0 deletions(-)
  19
  20 diff --git a/arch/powerpc/kernel/of_device.c b/arch/powerpc/kernel/of_device.c
  21 index e921514..ac024ad 100644
  22 --- a/arch/powerpc/kernel/of_device.c
  23 +++ b/arch/powerpc/kernel/of_device.c
  24 @@ -120,6 +120,71 @@ void of_device_unregister(struct of_device *ofdev)
  25  }
  26
  27
  28 +int of_device_uevent(struct device *dev,
  29 +               char **envp, int num_envp, char *buffer, int buffer_size)
  30 +{
  31 +       struct of_device *ofdev;
  32 +       const char *compat;
  33 +       char *compat2;
  34 +       char compat_buf[128];   /* need to be size of 'compatible' */
  35 +       int i = 0, length = 0, seen = 0, cplen, sl;
  36 +
  37 +       if (!dev)
  38 +               return -ENODEV;
  39 +
  40 +       ofdev = to_of_device(dev);
  41 +
  42 +       if (add_uevent_var(envp, num_envp, &i,
  43 +                          buffer, buffer_size, &length,
  44 +                          "OF_NAME=%s", ofdev->node->name))
  45 +               return -ENOMEM;
  46 +
  47 +       if (add_uevent_var(envp, num_envp, &i,
  48 +                          buffer, buffer_size, &length,
  49 +                          "OF_TYPE=%s", ofdev->node->type))
  50 +               return -ENOMEM;
  51 +
  52 +        /* Since the compatible field can contain pretty much anything
  53 +         * it's not really legal to split it out with commas. We split it
  54 +         * up using a number of environment variables instead. */
  55 +
  56 +       compat = get_property(ofdev->node, "compatible", &cplen);
  57 +       compat2 = compat_buf;
  58 +       if (compat)
  59 +               memcpy(compat2, compat, cplen);
  60 +       while (compat && *compat && cplen > 0) {
  61 +               if (add_uevent_var(envp, num_envp, &i,
  62 +                                  buffer, buffer_size, &length,
  63 +                                  "OF_COMPATIBLE_%d=%s", seen, compat))
  64 +                       return -ENOMEM;
  65 +
  66 +               sl = strlen (compat) + 1;
  67 +               compat += sl;
  68 +               compat2 += sl;
  69 +               cplen -= sl;
  70 +               seen++;
  71 +               compat2[-1] = 'C';
  72 +       }
  73 +       compat2[seen?-1:0] = 0;
  74 +
  75 +       if (add_uevent_var(envp, num_envp, &i,
  76 +                          buffer, buffer_size, &length,
  77 +                          "OF_COMPATIBLE_N=%d", seen))
  78 +               return -ENOMEM;
  79 +
  80 +       if (add_uevent_var(envp, num_envp, &i,
  81 +                          buffer, buffer_size, &length,
  82 +                          "MODALIAS=of:N%sT%sC%s",
  83 +                          ofdev->node->name, ofdev->node->type,
  84 +                          compat_buf))
  85 +               return -ENOMEM;
  86 +
  87 +       envp[i] = NULL;
  88 +
  89 +       return 0;
  90 +}
  91 +
  92 +
  93  EXPORT_SYMBOL(of_match_node);
  94  EXPORT_SYMBOL(of_match_device);
  95  EXPORT_SYMBOL(of_device_register);
  96 @@ -127,3 +192,4 @@ EXPORT_SYMBOL(of_device_unregister);
  97  EXPORT_SYMBOL(of_dev_get);
  98  EXPORT_SYMBOL(of_dev_put);
  99  EXPORT_SYMBOL(of_release_dev);
 100 +EXPORT_SYMBOL(of_device_uevent);
 101 diff --git a/include/asm-powerpc/of_device.h b/include/asm-powerpc/of_device.h
 102 index a889b20..4f1aabe 100644
 103 --- a/include/asm-powerpc/of_device.h
 104 +++ b/include/asm-powerpc/of_device.h
 105 @@ -32,5 +32,8 @@ extern int of_device_register(struct of_device *ofdev);
 106  extern void of_device_unregister(struct of_device *ofdev);
 107  extern void of_release_dev(struct device *dev);
 108
 109 +extern int of_device_uevent(struct device *dev,
 110 +       char **envp, int num_envp, char *buffer, int buffer_size);
 111 +
 112  #endif /* __KERNEL__ */
 113  #endif /* _ASM_POWERPC_OF_DEVICE_H */
 114 --
 115 1.4.4.2
 116