Deleted: trunk/drivers/hwmon/ad5258.c (7228 => 7229)
--- trunk/drivers/hwmon/ad5258.c 2009-08-24 09:17:42 UTC (rev 7228)
+++ trunk/drivers/hwmon/ad5258.c 2009-08-24 09:19:01 UTC (rev 7229)
@@ -1,365 +0,0 @@
-/*
- * Driver for the Analog Devices AD5258/9 single-channel digital
- * potentiometer.
- *
- * Copyright (c) 2009 Cyber Switching, Inc.
- * Author: Chris Verges <[email protected]>
- *
- * derived from ad5252.c
- * Copyright (c) 2006 Michael Hennerich <[email protected]>
- *
- * derived from pcf8547.c
- * Copyright (c) 2000 Frodo Looijaard <[email protected]>,
- * Philip Edelbrock <[email protected]>,
- * Dan Eaton <[email protected]>
- * Ported to Linux 2.6 by Aurelien Jarno <[email protected]> with
- * the help of Jean Delvare <[email protected]>
- *
- *
- * 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; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/i2c.h>
-#include <linux/delay.h>
-
-#define DRIVER_NAME "ad5258"
-#define DRIVER_VERSION "0.1"
-
-enum dpot_devid {
- AD5258_ID,
- AD5259_ID,
-};
-
-#define AD5258_MAX_POSITION 64
-#define AD5259_MAX_POSITION 256
-
-/* RDAC-to-EEPROM Interface Commands */
-#define AD5258_I2C_RDAC (0x00 << 5)
-#define AD5258_I2C_EEPROM (0x01 << 5)
-#define AD5258_I2C_WPREG (0x02 << 5)
-#define AD5258_NOP (0x04 << 5)
-#define AD5258_RESTORE_FROM_EEPROM (0x05 << 5)
-#define AD5258_STORE_TO_EEPROM (0x06 << 5)
-
-/* Registers */
-#define AD5258_REG_RDAC (0x00 << 0) /* 1 byte */
-#define AD5258_REG_TOLERANCE (0x1E << 0) /* 2 bytes */
-
-static s32 ad5258_read(struct i2c_client *client, u8 reg);
-static s32 ad5258_write(struct i2c_client *client, u8 reg, u8 value);
-
-/*
- * Client data (each client gets its own)
- */
-
-struct dpot_data {
- struct mutex update_lock;
- unsigned rdac_mask;
-};
-
-
-/* ------------------------------------------------------------------------- */
-
-/* sysfs functions */
-
-static ssize_t show_rdac(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct i2c_client *client = to_i2c_client(dev);
- struct dpot_data *data = ""
- s32 value;
-
- mutex_lock(&data->update_lock);
- value = ad5258_read(client, AD5258_I2C_RDAC | AD5258_REG_RDAC);
- mutex_unlock(&data->update_lock);
-
- if (value < 0)
- return -EINVAL;
-
- return sprintf(buf, "%u\n", value & data->rdac_mask);
-}
-
-static ssize_t set_rdac(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t count)
-{
- struct i2c_client *client = to_i2c_client(dev);
- struct dpot_data *data = ""
- unsigned long value;
- int err;
-
- err = strict_strtoul(buf, 10, &value);
- if (err)
- return err;
-
- if (value > data->rdac_mask)
- value = data->rdac_mask;
-
- mutex_lock(&data->update_lock);
- ad5258_write(client, AD5258_I2C_RDAC | AD5258_REG_RDAC, value);
- mutex_unlock(&data->update_lock);
-
- return count;
-}
-
-static DEVICE_ATTR(rdac, S_IWUSR | S_IRUGO, show_rdac, set_rdac);
-
-static ssize_t show_eeprom(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct i2c_client *client = to_i2c_client(dev);
- struct dpot_data *data = ""
- s32 value;
-
- mutex_lock(&data->update_lock);
- value = ad5258_read(client, AD5258_I2C_EEPROM | AD5258_REG_RDAC);
- mutex_unlock(&data->update_lock);
-
- if (value < 0)
- return -EINVAL;
-
- return sprintf(buf, "%u\n", value & data->rdac_mask);
-}
-
-static ssize_t set_eeprom(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t count)
-{
- struct i2c_client *client = to_i2c_client(dev);
- struct dpot_data *data = ""
- unsigned long value;
- int err;
-
- err = strict_strtoul(buf, 10, &value);
- if (err)
- return err;
-
- if (value > data->rdac_mask)
- value = data->rdac_mask;
-
- mutex_lock(&data->update_lock);
- ad5258_write(client, AD5258_I2C_EEPROM | AD5258_REG_RDAC, value);
- msleep(26); /* Sleep while the EEPROM updates */
- mutex_unlock(&data->update_lock);
-
- return count;
-}
-
-static DEVICE_ATTR(eeprom, S_IWUSR | S_IRUGO, show_eeprom, set_eeprom);
-
-static ssize_t show_tolerance(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct i2c_client *client = to_i2c_client(dev);
- struct dpot_data *data = ""
- s32 value;
-
- mutex_lock(&data->update_lock);
- value = ad5258_read(client, AD5258_I2C_EEPROM | AD5258_REG_TOLERANCE);
- mutex_unlock(&data->update_lock);
-
- if (value < 0)
- return 0;
-
- /*
- * Let someone else deal with converting this ...
- * the tolerance is a two-byte value where the MSB
- * is a sign + integer value, and the LSB is a
- * decimal value. See page 18 of the AD5258
- * datasheet (Rev. A) for more details.
- */
- return sprintf(buf, "0x%04x\n", value & 0x0000FFFF);
-}
-
-static DEVICE_ATTR(tolerance, S_IRUGO, show_tolerance, NULL);
-
-/* ------------------------------------------------------------------------- */
-
-/* i2c device functions */
-
-/**
- * ad5258_read - return the value contained in the specified register
- * on the AD5258 device.
- * @client: value returned from i2c_new_device()
- * @reg: the register to read
- *
- * If the tolerance register is specified, 2 bytes are returned.
- * Otherwise, 1 byte is returned. A negative value indicates an error
- * occurred while reading the register.
- */
-static s32 ad5258_read(struct i2c_client *client, u8 reg)
-{
- if ((reg & 0x1F) == AD5258_REG_TOLERANCE)
- return i2c_smbus_read_word_data(client, reg);
- else
- return i2c_smbus_read_byte_data(client, reg);
-}
-
-/**
- * ad5258_write - store the given value in the specified register on
- * the AD5258 device.
- * @client: value returned from i2c_new_device()
- * @reg: the register to write
- * @value: the byte to store in the register
- *
- * For certain instructions that do not require a data byte, "NULL"
- * should be specified for the "value" parameter. These instructions
- * include NOP, RESTORE_FROM_EEPROM, and STORE_TO_EEPROM.
- *
- * A negative return value indicates an error occurred while reading
- * the register.
- */
-static s32 ad5258_write(struct i2c_client *client, u8 reg, u8 value)
-{
- /* Do not attempt to write the tolerance register */
- if ((reg & 0x1f) == AD5258_REG_TOLERANCE)
- return -EINVAL;
-
- /* Only write the instruction byte for certain commands */
- switch (reg & 0xE0) {
- case AD5258_NOP:
- case AD5258_RESTORE_FROM_EEPROM:
- case AD5258_STORE_TO_EEPROM:
- return i2c_smbus_write_byte(client, reg);
- }
-
- /* All other registers require instruction + data bytes */
- return i2c_smbus_write_byte_data(client, reg, value);
-}
-
-static int ad5258_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
-{
- struct device *dev = &client->dev;
- struct dpot_data *data;
- int err = 0;
-
- dev_dbg(dev, "%s\n", __func__);
-
- if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE)) {
- dev_err(dev, "missing I2C functionality for this driver\n");
- goto exit;
- }
-
- data = "" dpot_data), GFP_KERNEL);
- if (!data) {
- err = -ENOMEM;
- goto exit;
- }
-
- i2c_set_clientdata(client, data);
- mutex_init(&data->update_lock);
-
- switch (id->driver_data) {
- case AD5258_ID:
- data->rdac_mask = AD5258_MAX_POSITION - 1;
- break;
- case AD5259_ID:
- data->rdac_mask = AD5259_MAX_POSITION - 1;
- break;
- default:
- err = -ENODEV;
- goto exit_free;
- }
-
- /* Register sysfs hooks */
- err |= device_create_file(dev, &dev_attr_rdac);
- err |= device_create_file(dev, &dev_attr_eeprom);
- err |= device_create_file(dev, &dev_attr_tolerance);
-
- if (err) {
- dev_err(dev, "failed to register sysfs hooks\n");
- goto exit_free;
- }
-
- dev_info(dev, "%s %d-Position Digital Potentiometer registered\n",
- id->name, data->rdac_mask + 1);
-
- return 0;
-
-exit_free:
- kfree(data);
- i2c_set_clientdata(client, NULL);
-exit:
- dev_err(dev, "failed to create client\n");
- return err;
-}
-
-static int __devexit ad5258_remove(struct i2c_client *client)
-{
- struct dpot_data *data = ""
- struct device *dev = &client->dev;
-
- device_remove_file(dev, &dev_attr_rdac);
- device_remove_file(dev, &dev_attr_eeprom);
- device_remove_file(dev, &dev_attr_tolerance);
-
- i2c_set_clientdata(client, NULL);
- kfree(data);
-
- return 0;
-}
-
-static const struct i2c_device_id ad5258_idtable[] = {
- { "ad5258", AD5258_ID },
- { "ad5259", AD5259_ID },
- { }
-};
-
-MODULE_DEVICE_TABLE(i2c, ad5258_idtable);
-
-static struct i2c_driver ad5258_driver = {
- .driver = {
- .owner = THIS_MODULE,
- .name = DRIVER_NAME,
- },
- .id_table = ad5258_idtable,
- .probe = ad5258_probe,
- .remove = __devexit_p(ad5258_remove),
-};
-
-static int __init ad5258_init(void)
-{
- return i2c_add_driver(&ad5258_driver);
-}
-
-module_init(ad5258_init);
-
-static void __exit ad5258_exit(void)
-{
- i2c_del_driver(&ad5258_driver);
-}
-
-module_exit(ad5258_exit);
-
-MODULE_AUTHOR(
- "Chris Verges <[email protected]>, "
- "Michael Hennerich <[email protected]>, "
- "Frodo Looijaard <[email protected]>, "
- "Philip Edelbrock <[email protected]>, "
- "Dan Eaton <[email protected]> "
- "and Aurelien Jarno <[email protected]>");
-MODULE_DESCRIPTION("AD5258/9 digital potentiometer driver");
-MODULE_LICENSE("GPL");
-MODULE_VERSION(DRIVER_VERSION);
