drivers: misc: therm_est: Add of_match_table
[linux-2.6.git] / drivers / misc / ad525x_dpot.c
index 30a59f2..1d1d426 100644 (file)
@@ -1,6 +1,6 @@
 /*
- * ad525x_dpot: Driver for the Analog Devices AD525x digital potentiometers
- * Copyright (c) 2009 Analog Devices, Inc.
+ * ad525x_dpot: Driver for the Analog Devices digital potentiometers
+ * Copyright (c) 2009-2010 Analog Devices, Inc.
  * Author: Michael Hennerich <hennerich@blackfin.uclinux.org>
  *
  * DEVID               #Wipers         #Positions      Resistor Options (kOhm)
  * AD5255              3               512             25, 250
  * AD5253              4               64              1, 10, 50, 100
  * AD5254              4               256             1, 10, 50, 100
+ * AD5160              1               256             5, 10, 50, 100
+ * AD5161              1               256             5, 10, 50, 100
+ * AD5162              2               256             2.5, 10, 50, 100
+ * AD5165              1               256             100
+ * AD5200              1               256             10, 50
+ * AD5201              1               33              10, 50
+ * AD5203              4               64              10, 100
+ * AD5204              4               256             10, 50, 100
+ * AD5206              6               256             10, 50, 100
+ * AD5207              2               256             10, 50, 100
+ * AD5231              1               1024            10, 50, 100
+ * AD5232              2               256             10, 50, 100
+ * AD5233              4               64              10, 50, 100
+ * AD5235              2               1024            25, 250
+ * AD5260              1               256             20, 50, 200
+ * AD5262              2               256             20, 50, 200
+ * AD5263              4               256             20, 50, 200
+ * AD5290              1               256             10, 50, 100
+ * AD5291              1               256             20, 50, 100  (20-TP)
+ * AD5292              1               1024            20, 50, 100  (20-TP)
+ * AD5293              1               1024            20, 50, 100
+ * AD7376              1               128             10, 50, 100, 1M
+ * AD8400              1               256             1, 10, 50, 100
+ * AD8402              2               256             1, 10, 50, 100
+ * AD8403              4               256             1, 10, 50, 100
+ * ADN2850             3               512             25, 250
+ * AD5241              1               256             10, 100, 1M
+ * AD5246              1               128             5, 10, 50, 100
+ * AD5247              1               128             5, 10, 50, 100
+ * AD5245              1               256             5, 10, 50, 100
+ * AD5243              2               256             2.5, 10, 50, 100
+ * AD5248              2               256             2.5, 10, 50, 100
+ * AD5242              2               256             20, 50, 200
+ * AD5280              1               256             20, 50, 200
+ * AD5282              2               256             20, 50, 200
+ * ADN2860             3               512             25, 250
+ * AD5273              1               64              1, 10, 50, 100 (OTP)
+ * AD5171              1               64              5, 10, 50, 100 (OTP)
+ * AD5170              1               256             2.5, 10, 50, 100 (OTP)
+ * AD5172              2               256             2.5, 10, 50, 100 (OTP)
+ * AD5173              2               256             2.5, 10, 50, 100 (OTP)
+ * AD5270              1               1024            20, 50, 100 (50-TP)
+ * AD5271              1               256             20, 50, 100 (50-TP)
+ * AD5272              1               1024            20, 50, 100 (50-TP)
+ * AD5274              1               256             20, 50, 100 (50-TP)
  *
  * See Documentation/misc-devices/ad525x_dpot.txt for more info.
  *
@@ -19,7 +64,7 @@
  * Author: Chris Verges <chrisv@cyberswitching.com>
  *
  * derived from ad5252.c
- * Copyright (c) 2006 Michael Hennerich <hennerich@blackfin.uclinux.org>
+ * Copyright (c) 2006-2011 Michael Hennerich <hennerich@blackfin.uclinux.org>
  *
  * Licensed under the GPL-2 or later.
  */
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/i2c.h>
 #include <linux/delay.h>
+#include <linux/slab.h>
 
-#define DRIVER_NAME                    "ad525x_dpot"
-#define DRIVER_VERSION                 "0.1"
-
-enum dpot_devid {
-       AD5258_ID,
-       AD5259_ID,
-       AD5251_ID,
-       AD5252_ID,
-       AD5253_ID,
-       AD5254_ID,
-       AD5255_ID,
-};
-
-#define AD5258_MAX_POSITION            64
-#define AD5259_MAX_POSITION            256
-#define AD5251_MAX_POSITION            64
-#define AD5252_MAX_POSITION            256
-#define AD5253_MAX_POSITION            64
-#define AD5254_MAX_POSITION            256
-#define AD5255_MAX_POSITION            512
-
-#define AD525X_RDAC0           0
-#define AD525X_RDAC1           1
-#define AD525X_RDAC2           2
-#define AD525X_RDAC3           3
-
-#define AD525X_REG_TOL         0x18
-#define AD525X_TOL_RDAC0       (AD525X_REG_TOL | AD525X_RDAC0)
-#define AD525X_TOL_RDAC1       (AD525X_REG_TOL | AD525X_RDAC1)
-#define AD525X_TOL_RDAC2       (AD525X_REG_TOL | AD525X_RDAC2)
-#define AD525X_TOL_RDAC3       (AD525X_REG_TOL | AD525X_RDAC3)
-
-/* RDAC-to-EEPROM Interface Commands */
-#define AD525X_I2C_RDAC                (0x00 << 5)
-#define AD525X_I2C_EEPROM      (0x01 << 5)
-#define AD525X_I2C_CMD         (0x80)
-
-#define AD525X_DEC_ALL_6DB     (AD525X_I2C_CMD | (0x4 << 3))
-#define AD525X_INC_ALL_6DB     (AD525X_I2C_CMD | (0x9 << 3))
-#define AD525X_DEC_ALL         (AD525X_I2C_CMD | (0x6 << 3))
-#define AD525X_INC_ALL         (AD525X_I2C_CMD | (0xB << 3))
-
-static s32 ad525x_read(struct i2c_client *client, u8 reg);
-static s32 ad525x_write(struct i2c_client *client, u8 reg, u8 value);
+#include "ad525x_dpot.h"
 
 /*
  * Client data (each client gets its own)
  */
 
 struct dpot_data {
+       struct ad_dpot_bus_data bdata;
        struct mutex update_lock;
        unsigned rdac_mask;
        unsigned max_pos;
-       unsigned devid;
+       unsigned long devid;
+       unsigned uid;
+       unsigned feat;
+       unsigned wipers;
+       u16 rdac_cache[MAX_RDACS];
+       DECLARE_BITMAP(otp_en_mask, MAX_RDACS);
 };
 
-/* sysfs functions */
-
-static ssize_t sysfs_show_reg(struct device *dev,
-                             struct device_attribute *attr, char *buf, u32 reg)
+static inline int dpot_read_d8(struct dpot_data *dpot)
 {
-       struct i2c_client *client = to_i2c_client(dev);
-       struct dpot_data *data = i2c_get_clientdata(client);
-       s32 value;
-
-       mutex_lock(&data->update_lock);
-       value = ad525x_read(client, reg);
-       mutex_unlock(&data->update_lock);
-
-       if (value < 0)
-               return -EINVAL;
-       /*
-        * 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.
-        */
-
-       if (reg & AD525X_REG_TOL)
-               return sprintf(buf, "0x%04x\n", value & 0xFFFF);
-       else
-               return sprintf(buf, "%u\n", value & data->rdac_mask);
+       return dpot->bdata.bops->read_d8(dpot->bdata.client);
 }
 
-static ssize_t sysfs_set_reg(struct device *dev,
-                            struct device_attribute *attr,
-                            const char *buf, size_t count, u32 reg)
+static inline int dpot_read_r8d8(struct dpot_data *dpot, u8 reg)
 {
-       struct i2c_client *client = to_i2c_client(dev);
-       struct dpot_data *data = i2c_get_clientdata(client);
-       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);
-       ad525x_write(client, reg, value);
-       if (reg & AD525X_I2C_EEPROM)
-               msleep(26);     /* Sleep while the EEPROM updates */
-       mutex_unlock(&data->update_lock);
-
-       return count;
+       return dpot->bdata.bops->read_r8d8(dpot->bdata.client, reg);
 }
 
-static ssize_t sysfs_do_cmd(struct device *dev,
-                           struct device_attribute *attr,
-                           const char *buf, size_t count, u32 reg)
+static inline int dpot_read_r8d16(struct dpot_data *dpot, u8 reg)
 {
-       struct i2c_client *client = to_i2c_client(dev);
-       struct dpot_data *data = i2c_get_clientdata(client);
-
-       mutex_lock(&data->update_lock);
-       ad525x_write(client, reg, 0);
-       mutex_unlock(&data->update_lock);
-
-       return count;
+       return dpot->bdata.bops->read_r8d16(dpot->bdata.client, reg);
 }
 
-/* ------------------------------------------------------------------------- */
-
-static ssize_t show_rdac0(struct device *dev,
-                         struct device_attribute *attr, char *buf)
+static inline int dpot_write_d8(struct dpot_data *dpot, u8 val)
 {
-       return sysfs_show_reg(dev, attr, buf, AD525X_I2C_RDAC | AD525X_RDAC0);
+       return dpot->bdata.bops->write_d8(dpot->bdata.client, val);
 }
 
-static ssize_t set_rdac0(struct device *dev,
-                        struct device_attribute *attr,
-                        const char *buf, size_t count)
+static inline int dpot_write_r8d8(struct dpot_data *dpot, u8 reg, u16 val)
 {
-       return sysfs_set_reg(dev, attr, buf, count,
-                            AD525X_I2C_RDAC | AD525X_RDAC0);
+       return dpot->bdata.bops->write_r8d8(dpot->bdata.client, reg, val);
 }
 
-static DEVICE_ATTR(rdac0, S_IWUSR | S_IRUGO, show_rdac0, set_rdac0);
-
-static ssize_t show_eeprom0(struct device *dev,
-                           struct device_attribute *attr, char *buf)
+static inline int dpot_write_r8d16(struct dpot_data *dpot, u8 reg, u16 val)
 {
-       return sysfs_show_reg(dev, attr, buf, AD525X_I2C_EEPROM | AD525X_RDAC0);
+       return dpot->bdata.bops->write_r8d16(dpot->bdata.client, reg, val);
 }
 
-static ssize_t set_eeprom0(struct device *dev,
-                          struct device_attribute *attr,
-                          const char *buf, size_t count)
+static s32 dpot_read_spi(struct dpot_data *dpot, u8 reg)
 {
-       return sysfs_set_reg(dev, attr, buf, count,
-                            AD525X_I2C_EEPROM | AD525X_RDAC0);
-}
+       unsigned ctrl = 0;
+       int value;
 
-static DEVICE_ATTR(eeprom0, S_IWUSR | S_IRUGO, show_eeprom0, set_eeprom0);
+       if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD))) {
 
-static ssize_t show_tolerance0(struct device *dev,
-                              struct device_attribute *attr, char *buf)
-{
-       return sysfs_show_reg(dev, attr, buf,
-                             AD525X_I2C_EEPROM | AD525X_TOL_RDAC0);
-}
+               if (dpot->feat & F_RDACS_WONLY)
+                       return dpot->rdac_cache[reg & DPOT_RDAC_MASK];
+               if (dpot->uid == DPOT_UID(AD5291_ID) ||
+                       dpot->uid == DPOT_UID(AD5292_ID) ||
+                       dpot->uid == DPOT_UID(AD5293_ID)) {
 
-static DEVICE_ATTR(tolerance0, S_IRUGO, show_tolerance0, NULL);
+                       value = dpot_read_r8d8(dpot,
+                               DPOT_AD5291_READ_RDAC << 2);
 
-/* ------------------------------------------------------------------------- */
+                       if (dpot->uid == DPOT_UID(AD5291_ID))
+                               value = value >> 2;
 
-static ssize_t show_rdac1(struct device *dev,
-                         struct device_attribute *attr, char *buf)
-{
-       return sysfs_show_reg(dev, attr, buf, AD525X_I2C_RDAC | AD525X_RDAC1);
-}
+                       return value;
+               } else if (dpot->uid == DPOT_UID(AD5270_ID) ||
+                       dpot->uid == DPOT_UID(AD5271_ID)) {
 
-static ssize_t set_rdac1(struct device *dev,
-                        struct device_attribute *attr,
-                        const char *buf, size_t count)
-{
-       return sysfs_set_reg(dev, attr, buf, count,
-                            AD525X_I2C_RDAC | AD525X_RDAC1);
-}
+                       value = dpot_read_r8d8(dpot,
+                               DPOT_AD5270_1_2_4_READ_RDAC << 2);
 
-static DEVICE_ATTR(rdac1, S_IWUSR | S_IRUGO, show_rdac1, set_rdac1);
+                       if (value < 0)
+                               return value;
 
-static ssize_t show_eeprom1(struct device *dev,
-                           struct device_attribute *attr, char *buf)
-{
-       return sysfs_show_reg(dev, attr, buf, AD525X_I2C_EEPROM | AD525X_RDAC1);
-}
+                       if (dpot->uid == DPOT_UID(AD5271_ID))
+                               value = value >> 2;
 
-static ssize_t set_eeprom1(struct device *dev,
-                          struct device_attribute *attr,
-                          const char *buf, size_t count)
-{
-       return sysfs_set_reg(dev, attr, buf, count,
-                            AD525X_I2C_EEPROM | AD525X_RDAC1);
-}
+                       return value;
+               }
 
-static DEVICE_ATTR(eeprom1, S_IWUSR | S_IRUGO, show_eeprom1, set_eeprom1);
+               ctrl = DPOT_SPI_READ_RDAC;
+       } else if (reg & DPOT_ADDR_EEPROM) {
+               ctrl = DPOT_SPI_READ_EEPROM;
+       }
 
-static ssize_t show_tolerance1(struct device *dev,
-                              struct device_attribute *attr, char *buf)
-{
-       return sysfs_show_reg(dev, attr, buf,
-                             AD525X_I2C_EEPROM | AD525X_TOL_RDAC1);
+       if (dpot->feat & F_SPI_16BIT)
+               return dpot_read_r8d8(dpot, ctrl);
+       else if (dpot->feat & F_SPI_24BIT)
+               return dpot_read_r8d16(dpot, ctrl);
+
+       return -EFAULT;
+}
+
+static s32 dpot_read_i2c(struct dpot_data *dpot, u8 reg)
+{
+       int value;
+       unsigned ctrl = 0;
+       switch (dpot->uid) {
+       case DPOT_UID(AD5246_ID):
+       case DPOT_UID(AD5247_ID):
+               return dpot_read_d8(dpot);
+       case DPOT_UID(AD5245_ID):
+       case DPOT_UID(AD5241_ID):
+       case DPOT_UID(AD5242_ID):
+       case DPOT_UID(AD5243_ID):
+       case DPOT_UID(AD5248_ID):
+       case DPOT_UID(AD5280_ID):
+       case DPOT_UID(AD5282_ID):
+               ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
+                       0 : DPOT_AD5282_RDAC_AB;
+               return dpot_read_r8d8(dpot, ctrl);
+       case DPOT_UID(AD5170_ID):
+       case DPOT_UID(AD5171_ID):
+       case DPOT_UID(AD5273_ID):
+                       return dpot_read_d8(dpot);
+       case DPOT_UID(AD5172_ID):
+       case DPOT_UID(AD5173_ID):
+               ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
+                       0 : DPOT_AD5172_3_A0;
+               return dpot_read_r8d8(dpot, ctrl);
+       case DPOT_UID(AD5272_ID):
+       case DPOT_UID(AD5274_ID):
+                       dpot_write_r8d8(dpot,
+                               (DPOT_AD5270_1_2_4_READ_RDAC << 2), 0);
+
+                       value = dpot_read_r8d16(dpot,
+                               DPOT_AD5270_1_2_4_RDAC << 2);
+
+                       if (value < 0)
+                               return value;
+                       /*
+                        * AD5272/AD5274 returns high byte first, however
+                        * underling smbus expects low byte first.
+                        */
+                       value = swab16(value);
+
+                       if (dpot->uid == DPOT_UID(AD5271_ID))
+                               value = value >> 2;
+               return value;
+       default:
+               if ((reg & DPOT_REG_TOL) || (dpot->max_pos > 256))
+                       return dpot_read_r8d16(dpot, (reg & 0xF8) |
+                                       ((reg & 0x7) << 1));
+               else
+                       return dpot_read_r8d8(dpot, reg);
+       }
 }
 
-static DEVICE_ATTR(tolerance1, S_IRUGO, show_tolerance1, NULL);
+static s32 dpot_read(struct dpot_data *dpot, u8 reg)
+{
+       if (dpot->feat & F_SPI)
+               return dpot_read_spi(dpot, reg);
+       else
+               return dpot_read_i2c(dpot, reg);
+}
+
+static s32 dpot_write_spi(struct dpot_data *dpot, u8 reg, u16 value)
+{
+       unsigned val = 0;
+
+       if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD | DPOT_ADDR_OTP))) {
+               if (dpot->feat & F_RDACS_WONLY)
+                       dpot->rdac_cache[reg & DPOT_RDAC_MASK] = value;
+
+               if (dpot->feat & F_AD_APPDATA) {
+                       if (dpot->feat & F_SPI_8BIT) {
+                               val = ((reg & DPOT_RDAC_MASK) <<
+                                       DPOT_MAX_POS(dpot->devid)) |
+                                       value;
+                               return dpot_write_d8(dpot, val);
+                       } else if (dpot->feat & F_SPI_16BIT) {
+                               val = ((reg & DPOT_RDAC_MASK) <<
+                                       DPOT_MAX_POS(dpot->devid)) |
+                                       value;
+                               return dpot_write_r8d8(dpot, val >> 8,
+                                       val & 0xFF);
+                       } else
+                               BUG();
+               } else {
+                       if (dpot->uid == DPOT_UID(AD5291_ID) ||
+                               dpot->uid == DPOT_UID(AD5292_ID) ||
+                               dpot->uid == DPOT_UID(AD5293_ID)) {
+
+                               dpot_write_r8d8(dpot, DPOT_AD5291_CTRLREG << 2,
+                                               DPOT_AD5291_UNLOCK_CMD);
+
+                               if (dpot->uid == DPOT_UID(AD5291_ID))
+                                       value = value << 2;
+
+                               return dpot_write_r8d8(dpot,
+                                       (DPOT_AD5291_RDAC << 2) |
+                                       (value >> 8), value & 0xFF);
+                       } else if (dpot->uid == DPOT_UID(AD5270_ID) ||
+                               dpot->uid == DPOT_UID(AD5271_ID)) {
+                               dpot_write_r8d8(dpot,
+                                               DPOT_AD5270_1_2_4_CTRLREG << 2,
+                                               DPOT_AD5270_1_2_4_UNLOCK_CMD);
+
+                               if (dpot->uid == DPOT_UID(AD5271_ID))
+                                       value = value << 2;
+
+                               return dpot_write_r8d8(dpot,
+                                       (DPOT_AD5270_1_2_4_RDAC << 2) |
+                                       (value >> 8), value & 0xFF);
+                       }
+                       val = DPOT_SPI_RDAC | (reg & DPOT_RDAC_MASK);
+               }
+       } else if (reg & DPOT_ADDR_EEPROM) {
+               val = DPOT_SPI_EEPROM | (reg & DPOT_RDAC_MASK);
+       } else if (reg & DPOT_ADDR_CMD) {
+               switch (reg) {
+               case DPOT_DEC_ALL_6DB:
+                       val = DPOT_SPI_DEC_ALL_6DB;
+                       break;
+               case DPOT_INC_ALL_6DB:
+                       val = DPOT_SPI_INC_ALL_6DB;
+                       break;
+               case DPOT_DEC_ALL:
+                       val = DPOT_SPI_DEC_ALL;
+                       break;
+               case DPOT_INC_ALL:
+                       val = DPOT_SPI_INC_ALL;
+                       break;
+               }
+       } else if (reg & DPOT_ADDR_OTP) {
+               if (dpot->uid == DPOT_UID(AD5291_ID) ||
+                       dpot->uid == DPOT_UID(AD5292_ID)) {
+                       return dpot_write_r8d8(dpot,
+                               DPOT_AD5291_STORE_XTPM << 2, 0);
+               } else if (dpot->uid == DPOT_UID(AD5270_ID) ||
+                       dpot->uid == DPOT_UID(AD5271_ID)) {
+                       return dpot_write_r8d8(dpot,
+                               DPOT_AD5270_1_2_4_STORE_XTPM << 2, 0);
+               }
+       } else
+               BUG();
+
+       if (dpot->feat & F_SPI_16BIT)
+               return dpot_write_r8d8(dpot, val, value);
+       else if (dpot->feat & F_SPI_24BIT)
+               return dpot_write_r8d16(dpot, val, value);
+
+       return -EFAULT;
+}
+
+static s32 dpot_write_i2c(struct dpot_data *dpot, u8 reg, u16 value)
+{
+       /* Only write the instruction byte for certain commands */
+       unsigned tmp = 0, ctrl = 0;
 
-/* ------------------------------------------------------------------------- */
+       switch (dpot->uid) {
+       case DPOT_UID(AD5246_ID):
+       case DPOT_UID(AD5247_ID):
+               return dpot_write_d8(dpot, value);
+               break;
 
-static ssize_t show_rdac2(struct device *dev,
-                         struct device_attribute *attr, char *buf)
-{
-       return sysfs_show_reg(dev, attr, buf, AD525X_I2C_RDAC | AD525X_RDAC2);
-}
+       case DPOT_UID(AD5245_ID):
+       case DPOT_UID(AD5241_ID):
+       case DPOT_UID(AD5242_ID):
+       case DPOT_UID(AD5243_ID):
+       case DPOT_UID(AD5248_ID):
+       case DPOT_UID(AD5280_ID):
+       case DPOT_UID(AD5282_ID):
+               ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
+                       0 : DPOT_AD5282_RDAC_AB;
+               return dpot_write_r8d8(dpot, ctrl, value);
+               break;
+       case DPOT_UID(AD5171_ID):
+       case DPOT_UID(AD5273_ID):
+               if (reg & DPOT_ADDR_OTP) {
+                       tmp = dpot_read_d8(dpot);
+                       if (tmp >> 6) /* Ready to Program? */
+                               return -EFAULT;
+                       ctrl = DPOT_AD5273_FUSE;
+               }
+               return dpot_write_r8d8(dpot, ctrl, value);
+               break;
+       case DPOT_UID(AD5172_ID):
+       case DPOT_UID(AD5173_ID):
+               ctrl = ((reg & DPOT_RDAC_MASK) == DPOT_RDAC0) ?
+                       0 : DPOT_AD5172_3_A0;
+               if (reg & DPOT_ADDR_OTP) {
+                       tmp = dpot_read_r8d16(dpot, ctrl);
+                       if (tmp >> 14) /* Ready to Program? */
+                               return -EFAULT;
+                       ctrl |= DPOT_AD5170_2_3_FUSE;
+               }
+               return dpot_write_r8d8(dpot, ctrl, value);
+               break;
+       case DPOT_UID(AD5170_ID):
+               if (reg & DPOT_ADDR_OTP) {
+                       tmp = dpot_read_r8d16(dpot, tmp);
+                       if (tmp >> 14) /* Ready to Program? */
+                               return -EFAULT;
+                       ctrl = DPOT_AD5170_2_3_FUSE;
+               }
+               return dpot_write_r8d8(dpot, ctrl, value);
+               break;
+       case DPOT_UID(AD5272_ID):
+       case DPOT_UID(AD5274_ID):
+               dpot_write_r8d8(dpot, DPOT_AD5270_1_2_4_CTRLREG << 2,
+                               DPOT_AD5270_1_2_4_UNLOCK_CMD);
 
-static ssize_t set_rdac2(struct device *dev,
-                        struct device_attribute *attr,
-                        const char *buf, size_t count)
-{
-       return sysfs_set_reg(dev, attr, buf, count,
-                            AD525X_I2C_RDAC | AD525X_RDAC2);
-}
+               if (reg & DPOT_ADDR_OTP)
+                       return dpot_write_r8d8(dpot,
+                                       DPOT_AD5270_1_2_4_STORE_XTPM << 2, 0);
 
-static DEVICE_ATTR(rdac2, S_IWUSR | S_IRUGO, show_rdac2, set_rdac2);
+               if (dpot->uid == DPOT_UID(AD5274_ID))
+                       value = value << 2;
 
-static ssize_t show_eeprom2(struct device *dev,
-                           struct device_attribute *attr, char *buf)
-{
-       return sysfs_show_reg(dev, attr, buf, AD525X_I2C_EEPROM | AD525X_RDAC2);
+               return dpot_write_r8d8(dpot, (DPOT_AD5270_1_2_4_RDAC << 2) |
+                                      (value >> 8), value & 0xFF);
+               break;
+       default:
+               if (reg & DPOT_ADDR_CMD)
+                       return dpot_write_d8(dpot, reg);
+
+               if (dpot->max_pos > 256)
+                       return dpot_write_r8d16(dpot, (reg & 0xF8) |
+                                               ((reg & 0x7) << 1), value);
+               else
+                       /* All other registers require instruction + data bytes */
+                       return dpot_write_r8d8(dpot, reg, value);
+       }
 }
 
-static ssize_t set_eeprom2(struct device *dev,
-                          struct device_attribute *attr,
-                          const char *buf, size_t count)
+static s32 dpot_write(struct dpot_data *dpot, u8 reg, u16 value)
 {
-       return sysfs_set_reg(dev, attr, buf, count,
-                            AD525X_I2C_EEPROM | AD525X_RDAC2);
+       if (dpot->feat & F_SPI)
+               return dpot_write_spi(dpot, reg, value);
+       else
+               return dpot_write_i2c(dpot, reg, value);
 }
 
-static DEVICE_ATTR(eeprom2, S_IWUSR | S_IRUGO, show_eeprom2, set_eeprom2);
+/* sysfs functions */
 
-static ssize_t show_tolerance2(struct device *dev,
-                              struct device_attribute *attr, char *buf)
+static ssize_t sysfs_show_reg(struct device *dev,
+                             struct device_attribute *attr,
+                             char *buf, u32 reg)
 {
-       return sysfs_show_reg(dev, attr, buf,
-                             AD525X_I2C_EEPROM | AD525X_TOL_RDAC2);
-}
+       struct dpot_data *data = dev_get_drvdata(dev);
+       s32 value;
 
-static DEVICE_ATTR(tolerance2, S_IRUGO, show_tolerance2, NULL);
+       if (reg & DPOT_ADDR_OTP_EN)
+               return sprintf(buf, "%s\n",
+                       test_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask) ?
+                       "enabled" : "disabled");
 
-/* ------------------------------------------------------------------------- */
 
-static ssize_t show_rdac3(struct device *dev,
-                         struct device_attribute *attr, char *buf)
-{
-       return sysfs_show_reg(dev, attr, buf, AD525X_I2C_RDAC | AD525X_RDAC3);
+       mutex_lock(&data->update_lock);
+       value = dpot_read(data, reg);
+       mutex_unlock(&data->update_lock);
+
+       if (value < 0)
+               return -EINVAL;
+       /*
+        * 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.
+        */
+
+       if (reg & DPOT_REG_TOL)
+               return sprintf(buf, "0x%04x\n", value & 0xFFFF);
+       else
+               return sprintf(buf, "%u\n", value & data->rdac_mask);
 }
 
-static ssize_t set_rdac3(struct device *dev,
-                        struct device_attribute *attr,
-                        const char *buf, size_t count)
+static ssize_t sysfs_set_reg(struct device *dev,
+                            struct device_attribute *attr,
+                            const char *buf, size_t count, u32 reg)
 {
-       return sysfs_set_reg(dev, attr, buf, count,
-                            AD525X_I2C_RDAC | AD525X_RDAC3);
-}
+       struct dpot_data *data = dev_get_drvdata(dev);
+       unsigned long value;
+       int err;
 
-static DEVICE_ATTR(rdac3, S_IWUSR | S_IRUGO, show_rdac3, set_rdac3);
+       if (reg & DPOT_ADDR_OTP_EN) {
+               if (!strncmp(buf, "enabled", sizeof("enabled")))
+                       set_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask);
+               else
+                       clear_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask);
 
-static ssize_t show_eeprom3(struct device *dev,
-                           struct device_attribute *attr, char *buf)
-{
-       return sysfs_show_reg(dev, attr, buf, AD525X_I2C_EEPROM | AD525X_RDAC3);
-}
+               return count;
+       }
 
-static ssize_t set_eeprom3(struct device *dev,
-                          struct device_attribute *attr,
-                          const char *buf, size_t count)
-{
-       return sysfs_set_reg(dev, attr, buf, count,
-                            AD525X_I2C_EEPROM | AD525X_RDAC3);
-}
+       if ((reg & DPOT_ADDR_OTP) &&
+               !test_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask))
+               return -EPERM;
+
+       err = strict_strtoul(buf, 10, &value);
+       if (err)
+               return err;
 
-static DEVICE_ATTR(eeprom3, S_IWUSR | S_IRUGO, show_eeprom3, set_eeprom3);
+       if (value > data->rdac_mask)
+               value = data->rdac_mask;
 
-static ssize_t show_tolerance3(struct device *dev,
-                              struct device_attribute *attr, char *buf)
-{
-       return sysfs_show_reg(dev, attr, buf,
-                             AD525X_I2C_EEPROM | AD525X_TOL_RDAC3);
+       mutex_lock(&data->update_lock);
+       dpot_write(data, reg, value);
+       if (reg & DPOT_ADDR_EEPROM)
+               msleep(26);     /* Sleep while the EEPROM updates */
+       else if (reg & DPOT_ADDR_OTP)
+               msleep(400);    /* Sleep while the OTP updates */
+       mutex_unlock(&data->update_lock);
+
+       return count;
 }
 
-static DEVICE_ATTR(tolerance3, S_IRUGO, show_tolerance3, NULL);
-
-static struct attribute *ad525x_attributes_wipers[4][4] = {
-       {
-               &dev_attr_rdac0.attr,
-               &dev_attr_eeprom0.attr,
-               &dev_attr_tolerance0.attr,
-               NULL
-       }, {
-               &dev_attr_rdac1.attr,
-               &dev_attr_eeprom1.attr,
-               &dev_attr_tolerance1.attr,
-               NULL
-       }, {
-               &dev_attr_rdac2.attr,
-               &dev_attr_eeprom2.attr,
-               &dev_attr_tolerance2.attr,
-               NULL
-       }, {
-               &dev_attr_rdac3.attr,
-               &dev_attr_eeprom3.attr,
-               &dev_attr_tolerance3.attr,
-               NULL
-       }
-};
+static ssize_t sysfs_do_cmd(struct device *dev,
+                           struct device_attribute *attr,
+                           const char *buf, size_t count, u32 reg)
+{
+       struct dpot_data *data = dev_get_drvdata(dev);
 
-static const struct attribute_group ad525x_group_wipers[] = {
-       {.attrs = ad525x_attributes_wipers[AD525X_RDAC0]},
-       {.attrs = ad525x_attributes_wipers[AD525X_RDAC1]},
-       {.attrs = ad525x_attributes_wipers[AD525X_RDAC2]},
-       {.attrs = ad525x_attributes_wipers[AD525X_RDAC3]},
-};
+       mutex_lock(&data->update_lock);
+       dpot_write(data, reg, 0);
+       mutex_unlock(&data->update_lock);
+
+       return count;
+}
 
 /* ------------------------------------------------------------------------- */
 
-static ssize_t set_inc_all(struct device *dev,
-                          struct device_attribute *attr,
-                          const char *buf, size_t count)
-{
-       return sysfs_do_cmd(dev, attr, buf, count, AD525X_INC_ALL);
-}
+#define DPOT_DEVICE_SHOW(_name, _reg) static ssize_t \
+show_##_name(struct device *dev, \
+                         struct device_attribute *attr, char *buf) \
+{ \
+       return sysfs_show_reg(dev, attr, buf, _reg); \
+}
+
+#define DPOT_DEVICE_SET(_name, _reg) static ssize_t \
+set_##_name(struct device *dev, \
+                        struct device_attribute *attr, \
+                        const char *buf, size_t count) \
+{ \
+       return sysfs_set_reg(dev, attr, buf, count, _reg); \
+}
+
+#define DPOT_DEVICE_SHOW_SET(name, reg) \
+DPOT_DEVICE_SHOW(name, reg) \
+DPOT_DEVICE_SET(name, reg) \
+static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, set_##name);
+
+#define DPOT_DEVICE_SHOW_ONLY(name, reg) \
+DPOT_DEVICE_SHOW(name, reg) \
+static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, show_##name, NULL);
+
+DPOT_DEVICE_SHOW_SET(rdac0, DPOT_ADDR_RDAC | DPOT_RDAC0);
+DPOT_DEVICE_SHOW_SET(eeprom0, DPOT_ADDR_EEPROM | DPOT_RDAC0);
+DPOT_DEVICE_SHOW_ONLY(tolerance0, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC0);
+DPOT_DEVICE_SHOW_SET(otp0, DPOT_ADDR_OTP | DPOT_RDAC0);
+DPOT_DEVICE_SHOW_SET(otp0en, DPOT_ADDR_OTP_EN | DPOT_RDAC0);
+
+DPOT_DEVICE_SHOW_SET(rdac1, DPOT_ADDR_RDAC | DPOT_RDAC1);
+DPOT_DEVICE_SHOW_SET(eeprom1, DPOT_ADDR_EEPROM | DPOT_RDAC1);
+DPOT_DEVICE_SHOW_ONLY(tolerance1, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC1);
+DPOT_DEVICE_SHOW_SET(otp1, DPOT_ADDR_OTP | DPOT_RDAC1);
+DPOT_DEVICE_SHOW_SET(otp1en, DPOT_ADDR_OTP_EN | DPOT_RDAC1);
+
+DPOT_DEVICE_SHOW_SET(rdac2, DPOT_ADDR_RDAC | DPOT_RDAC2);
+DPOT_DEVICE_SHOW_SET(eeprom2, DPOT_ADDR_EEPROM | DPOT_RDAC2);
+DPOT_DEVICE_SHOW_ONLY(tolerance2, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC2);
+DPOT_DEVICE_SHOW_SET(otp2, DPOT_ADDR_OTP | DPOT_RDAC2);
+DPOT_DEVICE_SHOW_SET(otp2en, DPOT_ADDR_OTP_EN | DPOT_RDAC2);
+
+DPOT_DEVICE_SHOW_SET(rdac3, DPOT_ADDR_RDAC | DPOT_RDAC3);
+DPOT_DEVICE_SHOW_SET(eeprom3, DPOT_ADDR_EEPROM | DPOT_RDAC3);
+DPOT_DEVICE_SHOW_ONLY(tolerance3, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC3);
+DPOT_DEVICE_SHOW_SET(otp3, DPOT_ADDR_OTP | DPOT_RDAC3);
+DPOT_DEVICE_SHOW_SET(otp3en, DPOT_ADDR_OTP_EN | DPOT_RDAC3);
+
+DPOT_DEVICE_SHOW_SET(rdac4, DPOT_ADDR_RDAC | DPOT_RDAC4);
+DPOT_DEVICE_SHOW_SET(eeprom4, DPOT_ADDR_EEPROM | DPOT_RDAC4);
+DPOT_DEVICE_SHOW_ONLY(tolerance4, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC4);
+DPOT_DEVICE_SHOW_SET(otp4, DPOT_ADDR_OTP | DPOT_RDAC4);
+DPOT_DEVICE_SHOW_SET(otp4en, DPOT_ADDR_OTP_EN | DPOT_RDAC4);
+
+DPOT_DEVICE_SHOW_SET(rdac5, DPOT_ADDR_RDAC | DPOT_RDAC5);
+DPOT_DEVICE_SHOW_SET(eeprom5, DPOT_ADDR_EEPROM | DPOT_RDAC5);
+DPOT_DEVICE_SHOW_ONLY(tolerance5, DPOT_ADDR_EEPROM | DPOT_TOL_RDAC5);
+DPOT_DEVICE_SHOW_SET(otp5, DPOT_ADDR_OTP | DPOT_RDAC5);
+DPOT_DEVICE_SHOW_SET(otp5en, DPOT_ADDR_OTP_EN | DPOT_RDAC5);
+
+static const struct attribute *dpot_attrib_wipers[] = {
+       &dev_attr_rdac0.attr,
+       &dev_attr_rdac1.attr,
+       &dev_attr_rdac2.attr,
+       &dev_attr_rdac3.attr,
+       &dev_attr_rdac4.attr,
+       &dev_attr_rdac5.attr,
+       NULL
+};
 
-static DEVICE_ATTR(inc_all, S_IWUSR, NULL, set_inc_all);
+static const struct attribute *dpot_attrib_eeprom[] = {
+       &dev_attr_eeprom0.attr,
+       &dev_attr_eeprom1.attr,
+       &dev_attr_eeprom2.attr,
+       &dev_attr_eeprom3.attr,
+       &dev_attr_eeprom4.attr,
+       &dev_attr_eeprom5.attr,
+       NULL
+};
 
-static ssize_t set_dec_all(struct device *dev,
-                          struct device_attribute *attr,
-                          const char *buf, size_t count)
-{
-       return sysfs_do_cmd(dev, attr, buf, count, AD525X_DEC_ALL);
-}
+static const struct attribute *dpot_attrib_otp[] = {
+       &dev_attr_otp0.attr,
+       &dev_attr_otp1.attr,
+       &dev_attr_otp2.attr,
+       &dev_attr_otp3.attr,
+       &dev_attr_otp4.attr,
+       &dev_attr_otp5.attr,
+       NULL
+};
 
-static DEVICE_ATTR(dec_all, S_IWUSR, NULL, set_dec_all);
+static const struct attribute *dpot_attrib_otp_en[] = {
+       &dev_attr_otp0en.attr,
+       &dev_attr_otp1en.attr,
+       &dev_attr_otp2en.attr,
+       &dev_attr_otp3en.attr,
+       &dev_attr_otp4en.attr,
+       &dev_attr_otp5en.attr,
+       NULL
+};
 
-static ssize_t set_inc_all_6db(struct device *dev,
-                              struct device_attribute *attr,
-                              const char *buf, size_t count)
-{
-       return sysfs_do_cmd(dev, attr, buf, count, AD525X_INC_ALL_6DB);
-}
+static const struct attribute *dpot_attrib_tolerance[] = {
+       &dev_attr_tolerance0.attr,
+       &dev_attr_tolerance1.attr,
+       &dev_attr_tolerance2.attr,
+       &dev_attr_tolerance3.attr,
+       &dev_attr_tolerance4.attr,
+       &dev_attr_tolerance5.attr,
+       NULL
+};
 
-static DEVICE_ATTR(inc_all_6db, S_IWUSR, NULL, set_inc_all_6db);
+/* ------------------------------------------------------------------------- */
 
-static ssize_t set_dec_all_6db(struct device *dev,
-                              struct device_attribute *attr,
-                              const char *buf, size_t count)
-{
-       return sysfs_do_cmd(dev, attr, buf, count, AD525X_DEC_ALL_6DB);
-}
+#define DPOT_DEVICE_DO_CMD(_name, _cmd) static ssize_t \
+set_##_name(struct device *dev, \
+                        struct device_attribute *attr, \
+                        const char *buf, size_t count) \
+{ \
+       return sysfs_do_cmd(dev, attr, buf, count, _cmd); \
+} \
+static DEVICE_ATTR(_name, S_IWUSR | S_IRUGO, NULL, set_##_name);
 
-static DEVICE_ATTR(dec_all_6db, S_IWUSR, NULL, set_dec_all_6db);
+DPOT_DEVICE_DO_CMD(inc_all, DPOT_INC_ALL);
+DPOT_DEVICE_DO_CMD(dec_all, DPOT_DEC_ALL);
+DPOT_DEVICE_DO_CMD(inc_all_6db, DPOT_INC_ALL_6DB);
+DPOT_DEVICE_DO_CMD(dec_all_6db, DPOT_DEC_ALL_6DB);
 
 static struct attribute *ad525x_attributes_commands[] = {
        &dev_attr_inc_all.attr,
@@ -409,74 +641,57 @@ static const struct attribute_group ad525x_group_commands = {
        .attrs = ad525x_attributes_commands,
 };
 
-/* ------------------------------------------------------------------------- */
-
-/* i2c device functions */
+__devinit int ad_dpot_add_files(struct device *dev,
+               unsigned features, unsigned rdac)
+{
+       int err = sysfs_create_file(&dev->kobj,
+               dpot_attrib_wipers[rdac]);
+       if (features & F_CMD_EEP)
+               err |= sysfs_create_file(&dev->kobj,
+                       dpot_attrib_eeprom[rdac]);
+       if (features & F_CMD_TOL)
+               err |= sysfs_create_file(&dev->kobj,
+                       dpot_attrib_tolerance[rdac]);
+       if (features & F_CMD_OTP) {
+               err |= sysfs_create_file(&dev->kobj,
+                       dpot_attrib_otp_en[rdac]);
+               err |= sysfs_create_file(&dev->kobj,
+                       dpot_attrib_otp[rdac]);
+       }
 
-/**
- * ad525x_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 ad525x_read(struct i2c_client *client, u8 reg)
-{
-       struct dpot_data *data = i2c_get_clientdata(client);
+       if (err)
+               dev_err(dev, "failed to register sysfs hooks for RDAC%d\n",
+                       rdac);
 
-       if ((reg & AD525X_REG_TOL) || (data->max_pos > 256))
-               return i2c_smbus_read_word_data(client, (reg & 0xF8) |
-                                               ((reg & 0x7) << 1));
-       else
-               return i2c_smbus_read_byte_data(client, reg);
+       return err;
 }
 
-/**
- * ad525x_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 ad525x_write(struct i2c_client *client, u8 reg, u8 value)
-{
-       struct dpot_data *data = i2c_get_clientdata(client);
-
-       /* Only write the instruction byte for certain commands */
-       if (reg & AD525X_I2C_CMD)
-               return i2c_smbus_write_byte(client, reg);
-
-       if (data->max_pos > 256)
-               return i2c_smbus_write_word_data(client, (reg & 0xF8) |
-                                               ((reg & 0x7) << 1), value);
-       else
-               /* All other registers require instruction + data bytes */
-               return i2c_smbus_write_byte_data(client, reg, value);
+inline void ad_dpot_remove_files(struct device *dev,
+               unsigned features, unsigned rdac)
+{
+       sysfs_remove_file(&dev->kobj,
+               dpot_attrib_wipers[rdac]);
+       if (features & F_CMD_EEP)
+               sysfs_remove_file(&dev->kobj,
+                       dpot_attrib_eeprom[rdac]);
+       if (features & F_CMD_TOL)
+               sysfs_remove_file(&dev->kobj,
+                       dpot_attrib_tolerance[rdac]);
+       if (features & F_CMD_OTP) {
+               sysfs_remove_file(&dev->kobj,
+                       dpot_attrib_otp_en[rdac]);
+               sysfs_remove_file(&dev->kobj,
+                       dpot_attrib_otp[rdac]);
+       }
 }
 
-static int ad525x_probe(struct i2c_client *client,
-                       const struct i2c_device_id *id)
+int __devinit ad_dpot_probe(struct device *dev,
+               struct ad_dpot_bus_data *bdata, unsigned long devid,
+                           const char *name)
 {
-       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;
-       }
+       struct dpot_data *data;
+       int i, err = 0;
 
        data = kzalloc(sizeof(struct dpot_data), GFP_KERNEL);
        if (!data) {
@@ -484,183 +699,73 @@ static int ad525x_probe(struct i2c_client *client,
                goto exit;
        }
 
-       i2c_set_clientdata(client, data);
+       dev_set_drvdata(dev, data);
        mutex_init(&data->update_lock);
 
-       switch (id->driver_data) {
-       case AD5258_ID:
-               data->max_pos = AD5258_MAX_POSITION;
-               err = sysfs_create_group(&dev->kobj,
-                                      &ad525x_group_wipers[AD525X_RDAC0]);
-               break;
-       case AD5259_ID:
-               data->max_pos = AD5259_MAX_POSITION;
-               err = sysfs_create_group(&dev->kobj,
-                                      &ad525x_group_wipers[AD525X_RDAC0]);
-               break;
-       case AD5251_ID:
-               data->max_pos = AD5251_MAX_POSITION;
-               err = sysfs_create_group(&dev->kobj,
-                                      &ad525x_group_wipers[AD525X_RDAC1]);
-               err |= sysfs_create_group(&dev->kobj,
-                                      &ad525x_group_wipers[AD525X_RDAC3]);
-               err |= sysfs_create_group(&dev->kobj, &ad525x_group_commands);
-               break;
-       case AD5252_ID:
-               data->max_pos = AD5252_MAX_POSITION;
-               err = sysfs_create_group(&dev->kobj,
-                                      &ad525x_group_wipers[AD525X_RDAC1]);
-               err |= sysfs_create_group(&dev->kobj,
-                                      &ad525x_group_wipers[AD525X_RDAC3]);
-               err |= sysfs_create_group(&dev->kobj, &ad525x_group_commands);
-               break;
-       case AD5253_ID:
-               data->max_pos = AD5253_MAX_POSITION;
-               err = sysfs_create_group(&dev->kobj,
-                                      &ad525x_group_wipers[AD525X_RDAC0]);
-               err |= sysfs_create_group(&dev->kobj,
-                                      &ad525x_group_wipers[AD525X_RDAC1]);
-               err |= sysfs_create_group(&dev->kobj,
-                                      &ad525x_group_wipers[AD525X_RDAC2]);
-               err |= sysfs_create_group(&dev->kobj,
-                                      &ad525x_group_wipers[AD525X_RDAC3]);
-               err |= sysfs_create_group(&dev->kobj, &ad525x_group_commands);
-               break;
-       case AD5254_ID:
-               data->max_pos = AD5254_MAX_POSITION;
-               err = sysfs_create_group(&dev->kobj,
-                                      &ad525x_group_wipers[AD525X_RDAC0]);
-               err |= sysfs_create_group(&dev->kobj,
-                                      &ad525x_group_wipers[AD525X_RDAC1]);
-               err |= sysfs_create_group(&dev->kobj,
-                                      &ad525x_group_wipers[AD525X_RDAC2]);
-               err |= sysfs_create_group(&dev->kobj,
-                                      &ad525x_group_wipers[AD525X_RDAC3]);
-               err |= sysfs_create_group(&dev->kobj, &ad525x_group_commands);
-               break;
-       case AD5255_ID:
-               data->max_pos = AD5255_MAX_POSITION;
-               err = sysfs_create_group(&dev->kobj,
-                                      &ad525x_group_wipers[AD525X_RDAC0]);
-               err |= sysfs_create_group(&dev->kobj,
-                                      &ad525x_group_wipers[AD525X_RDAC1]);
-               err |= sysfs_create_group(&dev->kobj,
-                                      &ad525x_group_wipers[AD525X_RDAC2]);
-               err |= sysfs_create_group(&dev->kobj, &ad525x_group_commands);
-               break;
-       default:
-               err = -ENODEV;
-               goto exit_free;
-       }
+       data->bdata = *bdata;
+       data->devid = devid;
+
+       data->max_pos = 1 << DPOT_MAX_POS(devid);
+       data->rdac_mask = data->max_pos - 1;
+       data->feat = DPOT_FEAT(devid);
+       data->uid = DPOT_UID(devid);
+       data->wipers = DPOT_WIPERS(devid);
+
+       for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
+               if (data->wipers & (1 << i)) {
+                       err = ad_dpot_add_files(dev, data->feat, i);
+                       if (err)
+                               goto exit_remove_files;
+                       /* power-up midscale */
+                       if (data->feat & F_RDACS_WONLY)
+                               data->rdac_cache[i] = data->max_pos / 2;
+               }
+
+       if (data->feat & F_CMD_INC)
+               err = sysfs_create_group(&dev->kobj, &ad525x_group_commands);
 
        if (err) {
                dev_err(dev, "failed to register sysfs hooks\n");
                goto exit_free;
        }
 
-       data->devid = id->driver_data;
-       data->rdac_mask = data->max_pos - 1;
-
        dev_info(dev, "%s %d-Position Digital Potentiometer registered\n",
-                id->name, data->max_pos);
+                name, data->max_pos);
 
        return 0;
 
+exit_remove_files:
+       for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
+               if (data->wipers & (1 << i))
+                       ad_dpot_remove_files(dev, data->feat, i);
+
 exit_free:
        kfree(data);
-       i2c_set_clientdata(client, NULL);
+       dev_set_drvdata(dev, NULL);
 exit:
-       dev_err(dev, "failed to create client\n");
+       dev_err(dev, "failed to create client for %s ID 0x%lX\n",
+               name, devid);
        return err;
 }
+EXPORT_SYMBOL(ad_dpot_probe);
 
-static int __devexit ad525x_remove(struct i2c_client *client)
+__devexit int ad_dpot_remove(struct device *dev)
 {
-       struct dpot_data *data = i2c_get_clientdata(client);
-       struct device *dev = &client->dev;
-
-       switch (data->devid) {
-       case AD5258_ID:
-       case AD5259_ID:
-               sysfs_remove_group(&dev->kobj,
-                                  &ad525x_group_wipers[AD525X_RDAC0]);
-               break;
-       case AD5251_ID:
-       case AD5252_ID:
-               sysfs_remove_group(&dev->kobj,
-                                  &ad525x_group_wipers[AD525X_RDAC1]);
-               sysfs_remove_group(&dev->kobj,
-                                  &ad525x_group_wipers[AD525X_RDAC3]);
-               sysfs_remove_group(&dev->kobj, &ad525x_group_commands);
-               break;
-       case AD5253_ID:
-       case AD5254_ID:
-               sysfs_remove_group(&dev->kobj,
-                                  &ad525x_group_wipers[AD525X_RDAC0]);
-               sysfs_remove_group(&dev->kobj,
-                                  &ad525x_group_wipers[AD525X_RDAC1]);
-               sysfs_remove_group(&dev->kobj,
-                                  &ad525x_group_wipers[AD525X_RDAC2]);
-               sysfs_remove_group(&dev->kobj,
-                                  &ad525x_group_wipers[AD525X_RDAC3]);
-               sysfs_remove_group(&dev->kobj, &ad525x_group_commands);
-               break;
-       case AD5255_ID:
-               sysfs_remove_group(&dev->kobj,
-                                  &ad525x_group_wipers[AD525X_RDAC0]);
-               sysfs_remove_group(&dev->kobj,
-                                  &ad525x_group_wipers[AD525X_RDAC1]);
-               sysfs_remove_group(&dev->kobj,
-                                  &ad525x_group_wipers[AD525X_RDAC2]);
-               sysfs_remove_group(&dev->kobj, &ad525x_group_commands);
-               break;
-       }
+       struct dpot_data *data = dev_get_drvdata(dev);
+       int i;
+
+       for (i = DPOT_RDAC0; i < MAX_RDACS; i++)
+               if (data->wipers & (1 << i))
+                       ad_dpot_remove_files(dev, data->feat, i);
 
-       i2c_set_clientdata(client, NULL);
        kfree(data);
 
        return 0;
 }
+EXPORT_SYMBOL(ad_dpot_remove);
 
-static const struct i2c_device_id ad525x_idtable[] = {
-       {"ad5258", AD5258_ID},
-       {"ad5259", AD5259_ID},
-       {"ad5251", AD5251_ID},
-       {"ad5252", AD5252_ID},
-       {"ad5253", AD5253_ID},
-       {"ad5254", AD5254_ID},
-       {"ad5255", AD5255_ID},
-       {}
-};
-
-MODULE_DEVICE_TABLE(i2c, ad525x_idtable);
-
-static struct i2c_driver ad525x_driver = {
-       .driver = {
-                  .owner = THIS_MODULE,
-                  .name = DRIVER_NAME,
-                  },
-       .id_table = ad525x_idtable,
-       .probe = ad525x_probe,
-       .remove = __devexit_p(ad525x_remove),
-};
-
-static int __init ad525x_init(void)
-{
-       return i2c_add_driver(&ad525x_driver);
-}
-
-module_init(ad525x_init);
-
-static void __exit ad525x_exit(void)
-{
-       i2c_del_driver(&ad525x_driver);
-}
-
-module_exit(ad525x_exit);
 
 MODULE_AUTHOR("Chris Verges <chrisv@cyberswitching.com>, "
-             "Michael Hennerich <hennerich@blackfin.uclinux.org>, ");
-MODULE_DESCRIPTION("AD5258/9 digital potentiometer driver");
+             "Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("Digital potentiometer driver");
 MODULE_LICENSE("GPL");
-MODULE_VERSION(DRIVER_VERSION);