Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / include / linux / platform_data / at24.h

diff --git a/kernel/include/linux/platform_data/at24.h b/kernel/include/linux/platform_data/at24.h
new file mode 100644 (file)
index 0000000..c42aa89
--- /dev/null
+++ b/kernel/include/linux/platform_data/at24.h
@@ -0,0 +1,55 @@
+/*
+ * at24.h - platform_data for the at24 (generic eeprom) driver
+ * (C) Copyright 2008 by Pengutronix
+ * (C) Copyright 2012 by Wolfram Sang
+ * same license as the driver
+ */
+
+#ifndef _LINUX_AT24_H
+#define _LINUX_AT24_H
+
+#include <linux/types.h>
+#include <linux/memory.h>
+
+/**
+ * struct at24_platform_data - data to set up at24 (generic eeprom) driver
+ * @byte_len: size of eeprom in byte
+ * @page_size: number of byte which can be written in one go
+ * @flags: tunable options, check AT24_FLAG_* defines
+ * @setup: an optional callback invoked after eeprom is probed; enables kernel
+       code to access eeprom via memory_accessor, see example
+ * @context: optional parameter passed to setup()
+ *
+ * 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!
+ *
+ * An example in pseudo code for a setup() callback:
+ *
+ * void get_mac_addr(struct memory_accessor *mem_acc, void *context)
+ * {
+ *     u8 *mac_addr = ethernet_pdata->mac_addr;
+ *     off_t offset = context;
+ *
+ *     // Read MAC addr from EEPROM
+ *     if (mem_acc->read(mem_acc, mac_addr, offset, ETH_ALEN) == ETH_ALEN)
+ *             pr_info("Read MAC addr from EEPROM: %pM\n", mac_addr);
+ * }
+ *
+ * This function pointer and context can now be set up in at24_platform_data.
+ */
+
+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) */
+
+       void            (*setup)(struct memory_accessor *, void *context);
+       void            *context;
+};
+
+#endif /* _LINUX_AT24_H */