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m68k/atari: Implement arch_nvram_ops struct

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By implementing an arch_nvram_ops struct, a platform can re-use the
drivers/char/nvram.c module without needing any arch-specific code
in that module. Atari does so here.

Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Finn Thain
2019-01-15 15:18:56 +11:00
committed by Greg Kroah-Hartman
parent 1278cf66cf
commit a084dbf659
2 changed files with 63 additions and 0 deletions
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14
include/linux/nvram.h
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@@ -5,8 +5,18 @@
#include <linux/errno.h>
#include <uapi/linux/nvram.h>
struct nvram_ops {
ssize_t (*get_size)(void);
ssize_t (*read)(char *, size_t, loff_t *);
ssize_t (*write)(char *, size_t, loff_t *);
};
extern const struct nvram_ops arch_nvram_ops;
static inline ssize_t nvram_get_size(void)
{
if (arch_nvram_ops.get_size)
return arch_nvram_ops.get_size();
return -ENODEV;
}
@@ -21,11 +31,15 @@ static inline void nvram_write_byte(unsigned char val, int addr)
static inline ssize_t nvram_read(char *buf, size_t count, loff_t *ppos)
{
if (arch_nvram_ops.read)
return arch_nvram_ops.read(buf, count, ppos);
return -ENODEV;
}
static inline ssize_t nvram_write(char *buf, size_t count, loff_t *ppos)
{
if (arch_nvram_ops.write)
return arch_nvram_ops.write(buf, count, ppos);
return -ENODEV;
}