Commit 7f2a2f0d authored by Javier Martinez Canillas's avatar Javier Martinez Canillas Committed by Wolfram Sang
Browse files

eeprom: at24: Add OF device ID table 



The driver doesn't have a struct of_device_id table but supported devices
are registered via Device Trees. This is working on the assumption that a
I2C device registered via OF will always match a legacy I2C device ID and
that the MODALIAS reported will always be of the form i2c:<device>.

But this could change in the future so the correct approach is to have an
OF device ID table if the devices are registered via OF.

To maintain backward compatibility with old Device Trees, only use the OF
device ID table .data if the device was registered via OF and the OF node
compatible matches an entry in the OF device ID table.

Suggested-by: default avatarWolfram Sang <wsa@the-dreams.de>
Signed-off-by: default avatarJavier Martinez Canillas <javierm@redhat.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 8aee5575

drivers/misc/eeprom/at24.c

+70 −1
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 
#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/of_device.h>

#include <linux/slab.h>

#include <linux/delay.h>

#include <linux/mutex.h>
@@ -176,6 +177,64 @@ static const struct i2c_device_id at24_ids[] = { 
};

MODULE_DEVICE_TABLE(i2c, at24_ids);



static const struct of_device_id at24_of_match[] = {

	{

		.compatible = "atmel,24c00",

		.data = (void *)AT24_DEVICE_MAGIC(128 / 8, AT24_FLAG_TAKE8ADDR)

	},

	{

		.compatible = "atmel,24c01",

		.data = (void *)AT24_DEVICE_MAGIC(1024 / 8, 0)

	},

	{

		.compatible = "atmel,24c02",

		.data = (void *)AT24_DEVICE_MAGIC(2048 / 8, 0)

	},

	{

		.compatible = "atmel,spd",

		.data = (void *)AT24_DEVICE_MAGIC(2048 / 8,

				AT24_FLAG_READONLY | AT24_FLAG_IRUGO)

	},

	{

		.compatible = "atmel,24c04",

		.data = (void *)AT24_DEVICE_MAGIC(4096 / 8, 0)

	},

	{

		.compatible = "atmel,24c08",

		.data = (void *)AT24_DEVICE_MAGIC(8192 / 8, 0)

	},

	{

		.compatible = "atmel,24c16",

		.data = (void *)AT24_DEVICE_MAGIC(16384 / 8, 0)

	},

	{

		.compatible = "atmel,24c32",

		.data = (void *)AT24_DEVICE_MAGIC(32768 / 8, AT24_FLAG_ADDR16)

	},

	{

		.compatible = "atmel,24c64",

		.data = (void *)AT24_DEVICE_MAGIC(65536 / 8, AT24_FLAG_ADDR16)

	},

	{

		.compatible = "atmel,24c128",

		.data = (void *)AT24_DEVICE_MAGIC(131072 / 8, AT24_FLAG_ADDR16)

	},

	{

		.compatible = "atmel,24c256",

		.data = (void *)AT24_DEVICE_MAGIC(262144 / 8, AT24_FLAG_ADDR16)

	},

	{

		.compatible = "atmel,24c512",

		.data = (void *)AT24_DEVICE_MAGIC(524288 / 8, AT24_FLAG_ADDR16)

	},

	{

		.compatible = "atmel,24c1024",

		.data = (void *)AT24_DEVICE_MAGIC(1048576 / 8, AT24_FLAG_ADDR16)

	},

	{ },

};

MODULE_DEVICE_TABLE(of, at24_of_match);



static const struct acpi_device_id at24_acpi_ids[] = {

	{ "INT3499", AT24_DEVICE_MAGIC(8192 / 8, 0) },

	{ }
@@ -629,7 +688,16 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) 
	if (client->dev.platform_data) {

		chip = *(struct at24_platform_data *)client->dev.platform_data;

	} else {

		if (id) {

		/*

		 * The I2C core allows OF nodes compatibles to match against the

		 * I2C device ID table as a fallback, so check not only if an OF

		 * node is present but also if it matches an OF device ID entry.

		 */

		if (client->dev.of_node &&

		    of_match_device(at24_of_match, &client->dev)) {

			magic = (kernel_ulong_t)

				of_device_get_match_data(&client->dev);

		} else if (id) {

			magic = id->driver_data;

		} else {

			const struct acpi_device_id *aid;
@@ -855,6 +923,7 @@ static int at24_remove(struct i2c_client *client) 
static struct i2c_driver at24_driver = {

	.driver = {

		.name = "at24",

		.of_match_table = at24_of_match,

		.acpi_match_table = ACPI_PTR(at24_acpi_ids),

	},

	.probe = at24_probe,

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