i2c/chips: Move max6875 to drivers/misc/eeprom

This driver only reads the user EEPROM of that chip, so we can move it
to the eeprom-directory in order to further clean up (and later remove)
drivers/i2c/chips.

The Kconfig text was updated to match the current functionality,
dropping the meanwhile obsoleted parts.

Defconfigs have been adapted.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Ben Gardner <gardner.ben@gmail.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 0 insertions, 246 deletions

diff --git a/drivers/i2c/chips/max6875.c b/drivers/i2c/chips/max6875.c
deleted file mode 100644
index 033d9d81ec8a..000000000000
--- a/drivers/i2c/chips/max6875.c
+++ /dev/null
@@ -1,246 +0,0 @@
-/*
-    max6875.c - driver for MAX6874/MAX6875
-
-    Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com>
-
-    Based on i2c/chips/eeprom.c
-
-    The MAX6875 has a bank of registers and two banks of EEPROM.
-    Address ranges are defined as follows:
-     * 0x0000 - 0x0046 = configuration registers
-     * 0x8000 - 0x8046 = configuration EEPROM
-     * 0x8100 - 0x82FF = user EEPROM
-
-    This driver makes the user EEPROM available for read.
-
-    The registers & config EEPROM should be accessed via i2c-dev.
-
-    The MAX6875 ignores the lowest address bit, so each chip responds to
-    two addresses - 0x50/0x51 and 0x52/0x53.
-
-    Note that the MAX6875 uses i2c_smbus_write_byte_data() to set the read
-    address, so this driver is destructive if loaded for the wrong EEPROM chip.
-
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; version 2 of the License.
-*/
-
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/i2c.h>
-#include <linux/mutex.h>
-
-/* Do not scan - the MAX6875 access method will write to some EEPROM chips */
-static const unsigned short normal_i2c[] = { I2C_CLIENT_END };
-
-/* Insmod parameters */
-I2C_CLIENT_INSMOD_1(max6875);
-
-/* The MAX6875 can only read/write 16 bytes at a time */
-#define SLICE_SIZE			16
-#define SLICE_BITS			4
-
-/* USER EEPROM is at addresses 0x8100 - 0x82FF */
-#define USER_EEPROM_BASE		0x8100
-#define USER_EEPROM_SIZE		0x0200
-#define USER_EEPROM_SLICES		32
-
-/* MAX6875 commands */
-#define MAX6875_CMD_BLK_READ		0x84
-
-/* Each client has this additional data */
-struct max6875_data {
-	struct i2c_client	*fake_client;
-	struct mutex		update_lock;
-
-	u32			valid;
-	u8			data[USER_EEPROM_SIZE];
-	unsigned long		last_updated[USER_EEPROM_SLICES];
-};
-
-static void max6875_update_slice(struct i2c_client *client, int slice)
-{
-	struct max6875_data *data = i2c_get_clientdata(client);
-	int i, j, addr;
-	u8 *buf;
-
-	if (slice >= USER_EEPROM_SLICES)
-		return;
-
-	mutex_lock(&data->update_lock);
-
-	buf = &data->data[slice << SLICE_BITS];
-
-	if (!(data->valid & (1 << slice)) ||
-	    time_after(jiffies, data->last_updated[slice])) {
-
-		dev_dbg(&client->dev, "Starting update of slice %u\n", slice);
-
-		data->valid &= ~(1 << slice);
-
-		addr = USER_EEPROM_BASE + (slice << SLICE_BITS);
-
-		/* select the eeprom address */
-		if (i2c_smbus_write_byte_data(client, addr >> 8, addr & 0xFF)) {
-			dev_err(&client->dev, "address set failed\n");
-			goto exit_up;
-		}
-
-		if (i2c_check_functionality(client->adapter,
-					    I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
-			if (i2c_smbus_read_i2c_block_data(client,
-							  MAX6875_CMD_BLK_READ,
-							  SLICE_SIZE,
-							  buf) != SLICE_SIZE) {
-				goto exit_up;
-			}
-		} else {
-			for (i = 0; i < SLICE_SIZE; i++) {
-				j = i2c_smbus_read_byte(client);
-				if (j < 0) {
-					goto exit_up;
-				}
-				buf[i] = j;
-			}
-		}
-		data->last_updated[slice] = jiffies;
-		data->valid |= (1 << slice);
-	}
-exit_up:
-	mutex_unlock(&data->update_lock);
-}
-
-static ssize_t max6875_read(struct kobject *kobj,
-			    struct bin_attribute *bin_attr,
-			    char *buf, loff_t off, size_t count)
-{
-	struct i2c_client *client = kobj_to_i2c_client(kobj);
-	struct max6875_data *data = i2c_get_clientdata(client);
-	int slice, max_slice;
-
-	if (off > USER_EEPROM_SIZE)
-		return 0;
-
-	if (off + count > USER_EEPROM_SIZE)
-		count = USER_EEPROM_SIZE - off;
-
-	/* refresh slices which contain requested bytes */
-	max_slice = (off + count - 1) >> SLICE_BITS;
-	for (slice = (off >> SLICE_BITS); slice <= max_slice; slice++)
-		max6875_update_slice(client, slice);
-
-	memcpy(buf, &data->data[off], count);
-
-	return count;
-}
-
-static struct bin_attribute user_eeprom_attr = {
-	.attr = {
-		.name = "eeprom",
-		.mode = S_IRUGO,
-	},
-	.size = USER_EEPROM_SIZE,
-	.read = max6875_read,
-};
-
-/* Return 0 if detection is successful, -ENODEV otherwise */
-static int max6875_detect(struct i2c_client *client, int kind,
-			  struct i2c_board_info *info)
-{
-	struct i2c_adapter *adapter = client->adapter;
-
-	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WRITE_BYTE_DATA
-				     | I2C_FUNC_SMBUS_READ_BYTE))
-		return -ENODEV;
-
-	/* Only check even addresses */
-	if (client->addr & 1)
-		return -ENODEV;
-
-	strlcpy(info->type, "max6875", I2C_NAME_SIZE);
-
-	return 0;
-}
-
-static int max6875_probe(struct i2c_client *client,
-			 const struct i2c_device_id *id)
-{
-	struct max6875_data *data;
-	int err;
-
-	if (!(data = kzalloc(sizeof(struct max6875_data), GFP_KERNEL)))
-		return -ENOMEM;
-
-	/* A fake client is created on the odd address */
-	data->fake_client = i2c_new_dummy(client->adapter, client->addr + 1);
-	if (!data->fake_client) {
-		err = -ENOMEM;
-		goto exit_kfree;
-	}
-
-	/* Init real i2c_client */
-	i2c_set_clientdata(client, data);
-	mutex_init(&data->update_lock);
-
-	err = sysfs_create_bin_file(&client->dev.kobj, &user_eeprom_attr);
-	if (err)
-		goto exit_remove_fake;
-
-	return 0;
-
-exit_remove_fake:
-	i2c_unregister_device(data->fake_client);
-exit_kfree:
-	kfree(data);
-	return err;
-}
-
-static int max6875_remove(struct i2c_client *client)
-{
-	struct max6875_data *data = i2c_get_clientdata(client);
-
-	i2c_unregister_device(data->fake_client);
-
-	sysfs_remove_bin_file(&client->dev.kobj, &user_eeprom_attr);
-	kfree(data);
-
-	return 0;
-}
-
-static const struct i2c_device_id max6875_id[] = {
-	{ "max6875", 0 },
-	{ }
-};
-
-static struct i2c_driver max6875_driver = {
-	.driver = {
-		.name	= "max6875",
-	},
-	.probe		= max6875_probe,
-	.remove		= max6875_remove,
-	.id_table	= max6875_id,
-
-	.detect		= max6875_detect,
-	.address_data	= &addr_data,
-};
-
-static int __init max6875_init(void)
-{
-	return i2c_add_driver(&max6875_driver);
-}
-
-static void __exit max6875_exit(void)
-{
-	i2c_del_driver(&max6875_driver);
-}
-
-
-MODULE_AUTHOR("Ben Gardner <bgardner@wabtec.com>");
-MODULE_DESCRIPTION("MAX6875 driver");
-MODULE_LICENSE("GPL");
-
-module_init(max6875_init);
-module_exit(max6875_exit);