m68k/atari: Implement arch_nvram_ops struct (a084dbf6) · Commits · 戴 / test

arch/m68k/atari/nvram.c

+49 −0

Original line number	Diff line number	Diff line
		@@ -74,6 +74,55 @@ static void __nvram_set_checksum(void)
		__nvram_write_byte(sum, ATARI_CKS_LOC + 1);
		}

		static ssize_t atari_nvram_read(char buf, size_t count, loff_t ppos)
		{
		char *p = buf;
		loff_t i;

		spin_lock_irq(&rtc_lock);
		if (!__nvram_check_checksum()) {
		spin_unlock_irq(&rtc_lock);
		return -EIO;
		}
		for (i = *ppos; count > 0 && i < NVRAM_BYTES; --count, ++i, ++p)
		*p = __nvram_read_byte(i);
		spin_unlock_irq(&rtc_lock);

		*ppos = i;
		return p - buf;
		}

		static ssize_t atari_nvram_write(char buf, size_t count, loff_t ppos)
		{
		char *p = buf;
		loff_t i;

		spin_lock_irq(&rtc_lock);
		if (!__nvram_check_checksum()) {
		spin_unlock_irq(&rtc_lock);
		return -EIO;
		}
		for (i = *ppos; count > 0 && i < NVRAM_BYTES; --count, ++i, ++p)
		__nvram_write_byte(*p, i);
		__nvram_set_checksum();
		spin_unlock_irq(&rtc_lock);

		*ppos = i;
		return p - buf;
		}

		static ssize_t atari_nvram_get_size(void)
		{
		return NVRAM_BYTES;
		}

		const struct nvram_ops arch_nvram_ops = {
		.read = atari_nvram_read,
		.write = atari_nvram_write,
		.get_size = atari_nvram_get_size,
		};
		EXPORT_SYMBOL(arch_nvram_ops);

		#ifdef CONFIG_PROC_FS
		static struct {
		unsigned char val;

+14 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}