diff options
Diffstat (limited to 'include/linux/nvram.h')
| -rw-r--r-- | include/linux/nvram.h | 32 |
1 files changed, 30 insertions, 2 deletions
diff --git a/include/linux/nvram.h b/include/linux/nvram.h index 31c763087746..9df85703735c 100644 --- a/include/linux/nvram.h +++ b/include/linux/nvram.h @@ -66,18 +66,46 @@ static inline void nvram_write_byte(unsigned char val, int addr) #endif } +static inline ssize_t nvram_read_bytes(char *buf, size_t count, loff_t *ppos) +{ + ssize_t nvram_size = nvram_get_size(); + loff_t i; + char *p = buf; + + if (nvram_size < 0) + return nvram_size; + for (i = *ppos; count > 0 && i < nvram_size; ++i, ++p, --count) + *p = nvram_read_byte(i); + *ppos = i; + return p - buf; +} + +static inline ssize_t nvram_write_bytes(char *buf, size_t count, loff_t *ppos) +{ + ssize_t nvram_size = nvram_get_size(); + loff_t i; + char *p = buf; + + if (nvram_size < 0) + return nvram_size; + for (i = *ppos; count > 0 && i < nvram_size; ++i, ++p, --count) + nvram_write_byte(*p, i); + *ppos = i; + return p - buf; +} + 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; + return nvram_read_bytes(buf, count, ppos); } 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; + return nvram_write_bytes(buf, count, ppos); } #endif /* _LINUX_NVRAM_H */ |