From 871480933a1c28f8a9fed4c4d34d06c439a7a422 Mon Sep 17 00:00:00 2001 From: Srikant Patnaik Date: Sun, 11 Jan 2015 12:28:04 +0530 Subject: Moved, renamed, and deleted files The original directory structure was scattered and unorganized. Changes are basically to make it look like kernel structure. --- ANDROID_3.4.5/drivers/misc/eeprom/max6875.c | 215 ---------------------------- 1 file changed, 215 deletions(-) delete mode 100644 ANDROID_3.4.5/drivers/misc/eeprom/max6875.c (limited to 'ANDROID_3.4.5/drivers/misc/eeprom/max6875.c') diff --git a/ANDROID_3.4.5/drivers/misc/eeprom/max6875.c b/ANDROID_3.4.5/drivers/misc/eeprom/max6875.c deleted file mode 100644 index e36157d5..00000000 --- a/ANDROID_3.4.5/drivers/misc/eeprom/max6875.c +++ /dev/null @@ -1,215 +0,0 @@ -/* - * max6875.c - driver for MAX6874/MAX6875 - * - * Copyright (C) 2005 Ben Gardner - * - * Based on 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 -#include -#include -#include -#include -#include - -/* 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 file *filp, 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, -}; - -static int max6875_probe(struct i2c_client *client, - const struct i2c_device_id *id) -{ - struct i2c_adapter *adapter = client->adapter; - struct max6875_data *data; - int err; - - if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WRITE_BYTE_DATA - | I2C_FUNC_SMBUS_READ_BYTE)) - return -ENODEV; - - /* Only bind to even addresses */ - if (client->addr & 1) - return -ENODEV; - - 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, -}; - -module_i2c_driver(max6875_driver); - -MODULE_AUTHOR("Ben Gardner "); -MODULE_DESCRIPTION("MAX6875 driver"); -MODULE_LICENSE("GPL"); -- cgit