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Index: linux-3.12.27/arch/arm/mach-at91/board-dt-sam9.c
===================================================================
--- linux-3.12.27.orig/arch/arm/mach-at91/board-dt-sam9.c 2014-08-26 07:12:26.000000000 -0500
+++ linux-3.12.27/arch/arm/mach-at91/board-dt-sam9.c 2014-09-24 09:56:17.283867487 -0500
@@ -25,6 +25,36 @@
#include "board.h"
#include "generic.h"
+#include <linux/mts_at24.h>
+
+uint8_t mts_id_eeprom[512];
+
+EXPORT_SYMBOL(mts_id_eeprom);
+
+static void mts_id_eeprom_load(struct memory_accessor *macc, void *context)
+{
+ int tmp;
+
+ memset(mts_id_eeprom, 0, sizeof(mts_id_eeprom));
+
+ tmp = macc->read(macc, mts_id_eeprom, 0, sizeof(mts_id_eeprom));
+ if (tmp != sizeof(mts_id_eeprom)) {
+ printk(KERN_ERR "sam9x5: id eeprom read failed: %d\n", tmp);
+ } else {
+ printk(KERN_INFO "sam9x5: read %d bytes from id eeprom\n", tmp);
+ }
+}
+
+struct mts_eeprom_callback id_eeprom_callback = {
+ .address = 0x56,
+ .index = -1,
+ .setup = mts_id_eeprom_load,
+};
+
+struct mts_eeprom_callback* mts_eeprom_callback_lookup[] = {
+ &id_eeprom_callback,
+ NULL
+};
static const struct of_device_id irq_of_match[] __initconst = {
Index: linux-3.12.27/drivers/misc/eeprom/at24.c
===================================================================
--- linux-3.12.27.orig/drivers/misc/eeprom/at24.c 2014-08-26 07:12:26.000000000 -0500
+++ linux-3.12.27/drivers/misc/eeprom/at24.c 2014-09-23 11:41:52.470331651 -0500
@@ -24,6 +24,8 @@
#include <linux/i2c.h>
#include <linux/i2c/at24.h>
+#include <linux/mts_at24.h>
+
/*
* I2C EEPROMs from most vendors are inexpensive and mostly interchangeable.
* Differences between different vendor product lines (like Atmel AT24C or
@@ -473,6 +475,23 @@
chip->page_size = be32_to_cpup(val);
}
}
+
+static void at24_get_setup(struct i2c_client *client,
+ struct at24_platform_data *chip)
+{
+ int i;
+
+ for (i = 0; mts_eeprom_callback_lookup[i] != NULL; i++) {
+ if (mts_eeprom_callback_lookup[i]->address == client->addr) {
+ printk(KERN_INFO "%s: found a match for eeprom at %X\n", __func__, client->addr);
+ chip->setup = mts_eeprom_callback_lookup[i]->setup;
+ if (mts_eeprom_callback_lookup[i]->index > -1) {
+ chip->context = (void*)&mts_eeprom_callback_lookup[i]->index;
+ }
+ break;
+ }
+ }
+}
#else
static void at24_get_ofdata(struct i2c_client *client,
struct at24_platform_data *chip)
@@ -505,12 +524,14 @@
* is recommended anyhow.
*/
chip.page_size = 1;
+ chip.setup = NULL;
+ chip.context = NULL;
/* update chipdata if OF is present */
at24_get_ofdata(client, &chip);
- chip.setup = NULL;
- chip.context = NULL;
+ /* see if we have a setup callback */
+ at24_get_setup(client, &chip);
}
if (!is_power_of_2(chip.byte_len))
Index: linux-3.12.27/include/linux/mts_at24.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-3.12.27/include/linux/mts_at24.h 2014-09-23 11:41:52.470331651 -0500
@@ -0,0 +1,14 @@
+#ifndef _LINUX_MTSAT24_H
+#define _LINUX_MTSAT24_H
+
+#include <linux/memory.h>
+
+struct mts_eeprom_callback {
+ unsigned short address;
+ int index;
+ void (*setup)(struct memory_accessor *, void *context);
+};
+
+extern struct mts_eeprom_callback* mts_eeprom_callback_lookup[];
+
+#endif /* _LINUX_MTSAT24_H */
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