/*
- * 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
+ * AD5292 1 1024 20
+ * AD5293 1 1024 20
+ * 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)
*
* See Documentation/misc-devices/ad525x_dpot.txt for more info.
*
#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 DRIVER_VERSION "0.2"
-#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);
};
+static inline int dpot_read_d8(struct dpot_data *dpot)
+{
+ return dpot->bdata.bops->read_d8(dpot->bdata.client);
+}
+
+static inline int dpot_read_r8d8(struct dpot_data *dpot, u8 reg)
+{
+ return dpot->bdata.bops->read_r8d8(dpot->bdata.client, reg);
+}
+
+static inline int dpot_read_r8d16(struct dpot_data *dpot, u8 reg)
+{
+ return dpot->bdata.bops->read_r8d16(dpot->bdata.client, reg);
+}
+
+static inline int dpot_write_d8(struct dpot_data *dpot, u8 val)
+{
+ return dpot->bdata.bops->write_d8(dpot->bdata.client, val);
+}
+
+static inline int dpot_write_r8d8(struct dpot_data *dpot, u8 reg, u16 val)
+{
+ return dpot->bdata.bops->write_r8d8(dpot->bdata.client, reg, val);
+}
+
+static inline int dpot_write_r8d16(struct dpot_data *dpot, u8 reg, u16 val)
+{
+ return dpot->bdata.bops->write_r8d16(dpot->bdata.client, reg, val);
+}
+
+static s32 dpot_read_spi(struct dpot_data *dpot, u8 reg)
+{
+ unsigned ctrl = 0;
+
+ if (!(reg & (DPOT_ADDR_EEPROM | DPOT_ADDR_CMD))) {
+
+ 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))
+ return dpot_read_r8d8(dpot,
+ DPOT_AD5291_READ_RDAC << 2);
+
+ ctrl = DPOT_SPI_READ_RDAC;
+ } else if (reg & DPOT_ADDR_EEPROM) {
+ ctrl = DPOT_SPI_READ_EEPROM;
+ }
+
+ 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)
+{
+ 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_AD5291_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_AD5272_3_A0;
+ return dpot_read_r8d8(dpot, ctrl);
+ 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 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))) {
+ 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))
+ return dpot_write_r8d8(dpot,
+ (DPOT_AD5291_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
+ 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;
+
+ 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_AD5291_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_AD5272_3_A0;
+ if (reg & DPOT_ADDR_OTP) {
+ tmp = dpot_read_r8d16(dpot, ctrl);
+ if (tmp >> 14) /* Ready to Program? */
+ return -EFAULT;
+ ctrl |= DPOT_AD5270_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_AD5270_2_3_FUSE;
+ }
+ return dpot_write_r8d8(dpot, ctrl, value);
+ 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 s32 dpot_write(struct dpot_data *dpot, u8 reg, u16 value)
+{
+ if (dpot->feat & F_SPI)
+ return dpot_write_spi(dpot, reg, value);
+ else
+ return dpot_write_i2c(dpot, reg, value);
+}
+
/* sysfs functions */
static ssize_t sysfs_show_reg(struct device *dev,
- struct device_attribute *attr, char *buf, u32 reg)
+ struct device_attribute *attr,
+ char *buf, u32 reg)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct dpot_data *data = i2c_get_clientdata(client);
+ struct dpot_data *data = dev_get_drvdata(dev);
s32 value;
+ if (reg & DPOT_ADDR_OTP_EN)
+ return sprintf(buf, "%s\n",
+ test_bit(DPOT_RDAC_MASK & reg, data->otp_en_mask) ?
+ "enabled" : "disabled");
+
+
mutex_lock(&data->update_lock);
- value = ad525x_read(client, reg);
+ value = dpot_read(data, reg);
mutex_unlock(&data->update_lock);
if (value < 0)
* datasheet (Rev. A) for more details.
*/
- if (reg & AD525X_REG_TOL)
+ if (reg & DPOT_REG_TOL)
return sprintf(buf, "0x%04x\n", value & 0xFFFF);
else
return sprintf(buf, "%u\n", value & data->rdac_mask);
struct device_attribute *attr,
const char *buf, size_t count, u32 reg)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct dpot_data *data = i2c_get_clientdata(client);
+ struct dpot_data *data = dev_get_drvdata(dev);
unsigned long value;
int err;
+ 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);
+
+ return count;
+ }
+
+ 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;
value = data->rdac_mask;
mutex_lock(&data->update_lock);
- ad525x_write(client, reg, value);
- if (reg & AD525X_I2C_EEPROM)
+ 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;
struct device_attribute *attr,
const char *buf, size_t count, u32 reg)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct dpot_data *data = i2c_get_clientdata(client);
+ struct dpot_data *data = dev_get_drvdata(dev);
mutex_lock(&data->update_lock);
- ad525x_write(client, reg, 0);
+ dpot_write(data, reg, 0);
mutex_unlock(&data->update_lock);
return count;
/* ------------------------------------------------------------------------- */
-static ssize_t show_rdac0(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- return sysfs_show_reg(dev, attr, buf, AD525X_I2C_RDAC | AD525X_RDAC0);
-}
-
-static ssize_t set_rdac0(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_RDAC0);
-}
-
-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)
-{
- return sysfs_show_reg(dev, attr, buf, AD525X_I2C_EEPROM | AD525X_RDAC0);
-}
-
-static ssize_t set_eeprom0(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_RDAC0);
-}
-
-static DEVICE_ATTR(eeprom0, S_IWUSR | S_IRUGO, show_eeprom0, set_eeprom0);
-
-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);
-}
-
-static DEVICE_ATTR(tolerance0, S_IRUGO, show_tolerance0, NULL);
-
-/* ------------------------------------------------------------------------- */
-
-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);
-}
-
-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);
-}
-
-static DEVICE_ATTR(rdac1, S_IWUSR | S_IRUGO, show_rdac1, set_rdac1);
-
-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);
-}
-
-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);
-}
-
-static DEVICE_ATTR(eeprom1, S_IWUSR | S_IRUGO, show_eeprom1, set_eeprom1);
-
-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);
-}
-
-static DEVICE_ATTR(tolerance1, S_IRUGO, show_tolerance1, NULL);
-
-/* ------------------------------------------------------------------------- */
-
-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);
-}
-
-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);
-}
-
-static DEVICE_ATTR(rdac2, S_IWUSR | S_IRUGO, show_rdac2, set_rdac2);
-
-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);
-}
-
-static ssize_t set_eeprom2(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_RDAC2);
-}
-
-static DEVICE_ATTR(eeprom2, S_IWUSR | S_IRUGO, show_eeprom2, set_eeprom2);
-
-static ssize_t show_tolerance2(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- return sysfs_show_reg(dev, attr, buf,
- AD525X_I2C_EEPROM | AD525X_TOL_RDAC2);
-}
-
-static DEVICE_ATTR(tolerance2, S_IRUGO, show_tolerance2, NULL);
-
-/* ------------------------------------------------------------------------- */
-
-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);
-}
-
-static ssize_t set_rdac3(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_RDAC3);
-}
-
-static DEVICE_ATTR(rdac3, S_IWUSR | S_IRUGO, show_rdac3, set_rdac3);
-
-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);
-}
-
-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);
-}
+#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(eeprom3, S_IWUSR | S_IRUGO, show_eeprom3, set_eeprom3);
+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 show_tolerance3(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- return sysfs_show_reg(dev, attr, buf,
- AD525X_I2C_EEPROM | AD525X_TOL_RDAC3);
-}
+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(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 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 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]},
+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 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_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(inc_all, S_IWUSR, NULL, set_inc_all);
-
-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 DEVICE_ATTR(dec_all, S_IWUSR, NULL, set_dec_all);
-
-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 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);
-}
-
-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,
.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)
+__devinit int ad_dpot_probe(struct device *dev,
+ struct ad_dpot_bus_data *bdata, const struct ad_dpot_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;
- }
+ struct dpot_data *data;
+ int i, err = 0;
data = kzalloc(sizeof(struct dpot_data), GFP_KERNEL);
if (!data) {
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 = id->devid;
+
+ data->max_pos = 1 << DPOT_MAX_POS(data->devid);
+ data->rdac_mask = data->max_pos - 1;
+ data->feat = DPOT_FEAT(data->devid);
+ data->uid = DPOT_UID(data->devid);
+ data->wipers = DPOT_WIPERS(data->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);
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",
+ id->name, id->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);
git.openpandora.org / pandora-kernel.git / blobdiff