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-rw-r--r--drivers/misc/ad525x_dpot.c763
1 files changed, 763 insertions, 0 deletions
diff --git a/drivers/misc/ad525x_dpot.c b/drivers/misc/ad525x_dpot.c
new file mode 100644
index 000000000..756ef6912
--- /dev/null
+++ b/drivers/misc/ad525x_dpot.c
@@ -0,0 +1,763 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * ad525x_dpot: Driver for the Analog Devices digital potentiometers
+ * Copyright (c) 2009-2010 Analog Devices, Inc.
+ * Author: Michael Hennerich <michael.hennerich@analog.com>
+ *
+ * DEVID #Wipers #Positions Resistor Options (kOhm)
+ * AD5258 1 64 1, 10, 50, 100
+ * AD5259 1 256 5, 10, 50, 100
+ * AD5251 2 64 1, 10, 50, 100
+ * AD5252 2 256 1, 10, 50, 100
+ * 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.rst for more info.
+ *
+ * derived from ad5258.c
+ * Copyright (c) 2009 Cyber Switching, Inc.
+ * Author: Chris Verges <chrisv@cyberswitching.com>
+ *
+ * derived from ad5252.c
+ * Copyright (c) 2006-2011 Michael Hennerich <michael.hennerich@analog.com>
+ */
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+
+#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 int rdac_mask;
+ unsigned int max_pos;
+ unsigned long devid;
+ unsigned int uid;
+ unsigned int feat;
+ unsigned int 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 int ctrl = 0;
+ int value;
+
+ 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)) {
+
+ value = dpot_read_r8d8(dpot,
+ DPOT_AD5291_READ_RDAC << 2);
+
+ if (value < 0)
+ return value;
+
+ if (dpot->uid == DPOT_UID(AD5291_ID))
+ value = value >> 2;
+
+ return value;
+ } else if (dpot->uid == DPOT_UID(AD5270_ID) ||
+ dpot->uid == DPOT_UID(AD5271_ID)) {
+
+ value = dpot_read_r8d8(dpot,
+ DPOT_AD5270_1_2_4_READ_RDAC << 2);
+
+ if (value < 0)
+ return value;
+
+ if (dpot->uid == DPOT_UID(AD5271_ID))
+ value = value >> 2;
+
+ return value;
+ }
+
+ 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)
+{
+ int value;
+ unsigned int 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(AD5274_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 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 int 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 int tmp = 0, ctrl = 0;
+
+ switch (dpot->uid) {
+ case DPOT_UID(AD5246_ID):
+ case DPOT_UID(AD5247_ID):
+ return dpot_write_d8(dpot, value);
+
+ 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);
+ 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);
+ 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);
+ 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);
+ 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);
+
+ if (reg & DPOT_ADDR_OTP)
+ return dpot_write_r8d8(dpot,
+ DPOT_AD5270_1_2_4_STORE_XTPM << 2, 0);
+
+ if (dpot->uid == DPOT_UID(AD5274_ID))
+ value = value << 2;
+
+ return dpot_write_r8d8(dpot, (DPOT_AD5270_1_2_4_RDAC << 2) |
+ (value >> 8), value & 0xFF);
+ 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 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 = 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 sysfs_set_reg(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count, u32 reg)
+{
+ struct dpot_data *data = dev_get_drvdata(dev);
+ unsigned long value;
+ int err;
+
+ if (reg & DPOT_ADDR_OTP_EN) {
+ if (sysfs_streq(buf, "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 = kstrtoul(buf, 10, &value);
+ if (err)
+ return err;
+
+ if (value > data->rdac_mask)
+ value = data->rdac_mask;
+
+ 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 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);
+
+ mutex_lock(&data->update_lock);
+ dpot_write(data, reg, 0);
+ mutex_unlock(&data->update_lock);
+
+ return count;
+}
+
+/* ------------------------------------------------------------------------- */
+
+#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 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 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 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 *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
+};
+
+/* ------------------------------------------------------------------------- */
+
+#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)
+
+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,
+ &dev_attr_dec_all.attr,
+ &dev_attr_inc_all_6db.attr,
+ &dev_attr_dec_all_6db.attr,
+ NULL
+};
+
+static const struct attribute_group ad525x_group_commands = {
+ .attrs = ad525x_attributes_commands,
+};
+
+static int ad_dpot_add_files(struct device *dev,
+ unsigned int features, unsigned int 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]);
+ }
+
+ if (err)
+ dev_err(dev, "failed to register sysfs hooks for RDAC%d\n",
+ rdac);
+
+ return err;
+}
+
+static inline void ad_dpot_remove_files(struct device *dev,
+ unsigned int features, unsigned int 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]);
+ }
+}
+
+int ad_dpot_probe(struct device *dev,
+ struct ad_dpot_bus_data *bdata, unsigned long devid,
+ const char *name)
+{
+
+ struct dpot_data *data;
+ int i, err = 0;
+
+ data = kzalloc(sizeof(struct dpot_data), GFP_KERNEL);
+ if (!data) {
+ err = -ENOMEM;
+ goto exit;
+ }
+
+ dev_set_drvdata(dev, data);
+ mutex_init(&data->update_lock);
+
+ 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;
+ }
+
+ dev_info(dev, "%s %d-Position Digital Potentiometer registered\n",
+ 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);
+ dev_set_drvdata(dev, NULL);
+exit:
+ dev_err(dev, "failed to create client for %s ID 0x%lX\n",
+ name, devid);
+ return err;
+}
+EXPORT_SYMBOL(ad_dpot_probe);
+
+void ad_dpot_remove(struct device *dev)
+{
+ 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);
+
+ kfree(data);
+}
+EXPORT_SYMBOL(ad_dpot_remove);
+
+
+MODULE_AUTHOR("Chris Verges <chrisv@cyberswitching.com>, "
+ "Michael Hennerich <michael.hennerich@analog.com>");
+MODULE_DESCRIPTION("Digital potentiometer driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-19 02:51:15 +0000