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Diffstat (limited to 'include/linux/i2c/at24.h')
-rw-r--r--include/linux/i2c/at24.h28
1 files changed, 28 insertions, 0 deletions
diff --git a/include/linux/i2c/at24.h b/include/linux/i2c/at24.h
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index 00000000000..f6edd522a92
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+++ b/include/linux/i2c/at24.h
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+#ifndef _LINUX_AT24_H
+#define _LINUX_AT24_H
+
+#include <linux/types.h>
+
+/*
+ * As seen through Linux I2C, differences between the most common types of I2C
+ * memory include:
+ * - How much memory is available (usually specified in bit)?
+ * - What write page size does it support?
+ * - Special flags (16 bit addresses, read_only, world readable...)?
+ *
+ * If you set up a custom eeprom type, please double-check the parameters.
+ * Especially page_size needs extra care, as you risk data loss if your value
+ * is bigger than what the chip actually supports!
+ */
+
+struct at24_platform_data {
+ u32 byte_len; /* size (sum of all addr) */
+ u16 page_size; /* for writes */
+ u8 flags;
+#define AT24_FLAG_ADDR16 0x80 /* address pointer is 16 bit */
+#define AT24_FLAG_READONLY 0x40 /* sysfs-entry will be read-only */
+#define AT24_FLAG_IRUGO 0x20 /* sysfs-entry will be world-readable */
+#define AT24_FLAG_TAKE8ADDR 0x10 /* take always 8 addresses (24c00) */
+};
+
+#endif /* _LINUX_AT24_H */