Signed-off-by: Hernán Gonzalez <hernan@xxxxxxxxxxxxxxxxxxxx>
---
.../devicetree/bindings/iio/cdc/ad7746.txt | 34 +
drivers/iio/Kconfig | 1 +
drivers/iio/Makefile | 1 +
drivers/iio/cdc/Kconfig | 16 +
drivers/iio/cdc/Makefile | 5 +
drivers/iio/cdc/ad7746.c | 855 +++++++++++++++++++++
include/linux/iio/cdc/ad7746.h | 20 +
7 files changed, 932 insertions(+)
create mode 100644 Documentation/devicetree/bindings/iio/cdc/ad7746.txt
create mode 100644 drivers/iio/cdc/Kconfig
create mode 100644 drivers/iio/cdc/Makefile
create mode 100644 drivers/iio/cdc/ad7746.c
create mode 100644 include/linux/iio/cdc/ad7746.h
diff --git a/Documentation/devicetree/bindings/iio/cdc/ad7746.txt b/Documentation/devicetree/bindings/iio/cdc/ad7746.txt
new file mode 100644
index 0000000..7740f05
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/cdc/ad7746.txt
@@ -0,0 +1,34 @@
+Analog Devices AD7746/5/7 capacitive sensor driver
+
+Required properties:
+ - compatible: Should be one of
+ * "adi,ad7745"
+ * "adi,ad7746"
+ * "adi,ad7747"
+ - reg: The 7-bits long I2c address of the device
+
+Optional properties:
+ - adi,exclvl: This property defines the excitation voltage level for the
+ capacitance to be measured. Possible values are:
+ * 0 = +-VDD/8
+ * 1 = +-VDD/4
+ * 2 = +-VDD * 3/8
+ * 3 = +-VDD/2 (Default)
+ - adi,nexca_en: Invert excitation output A.
+ - adi,nexcb_en: Invert excitation output B.
+
+Example:
+Here exclvl would be 1 (VDD/4), Excitation pin A would be inverted and
+Excitation pin B would NOT be inverted.
+
+i2c2 {
+
+ < . . . >
+
+ ad7746: ad7746@60 {
+ compatible = "ad7746";
+ reg = <0x60>;
+ adi,exclvl = <1>;
+ adi,nexca_en;
+ };
+};
diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig
index b3c8c6e..d1c309b 100644
--- a/drivers/iio/Kconfig
+++ b/drivers/iio/Kconfig
@@ -71,6 +71,7 @@ config IIO_TRIGGERED_EVENT
source "drivers/iio/accel/Kconfig"
source "drivers/iio/adc/Kconfig"
source "drivers/iio/amplifiers/Kconfig"
+source "drivers/iio/cdc/Kconfig"
source "drivers/iio/chemical/Kconfig"
source "drivers/iio/common/Kconfig"
source "drivers/iio/counter/Kconfig"
diff --git a/drivers/iio/Makefile b/drivers/iio/Makefile
index b16b2e9..18bea8d 100644
--- a/drivers/iio/Makefile
+++ b/drivers/iio/Makefile
@@ -17,6 +17,7 @@ obj-y += accel/
obj-y += adc/
obj-y += amplifiers/
obj-y += buffer/
+obj-y += cdc/
obj-y += chemical/
obj-y += common/
obj-y += counter/
diff --git a/drivers/iio/cdc/Kconfig b/drivers/iio/cdc/Kconfig
new file mode 100644
index 0000000..d3a8600
--- /dev/null
+++ b/drivers/iio/cdc/Kconfig
@@ -0,0 +1,16 @@
+#
+# CDC drivers
+#
+menu "Capacitance to digital converters"
+
+config AD7746
+ tristate "Analog Devices AD7745, AD7746 AD7747 capacitive sensor driver"
+ depends on I2C
+ help
+ Say yes here to build support for Analog Devices capacitive sensors.
+ (AD7745, AD7746, AD7747) Provides direct access via sysfs.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ad7746.
+
+endmenu
diff --git a/drivers/iio/cdc/Makefile b/drivers/iio/cdc/Makefile
new file mode 100644
index 0000000..1f71283
--- /dev/null
+++ b/drivers/iio/cdc/Makefile
@@ -0,0 +1,5 @@
+#
+#Makeefile for industrial I/O CDC drivers
+#
+
+obj-$(CONFIG_AD7746) += ad7746.o
diff --git a/drivers/iio/cdc/ad7746.c b/drivers/iio/cdc/ad7746.c
new file mode 100644
index 0000000..f283819
--- /dev/null
+++ b/drivers/iio/cdc/ad7746.c
@@ -0,0 +1,855 @@
+/*
+ * AD7746 capacitive sensor driver supporting AD7745, AD7746 and AD7747
+ *
+ * Copyright 2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/sysfs.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/cdc/ad7746.h>
+
+/*
+ * AD7746 Register Definition
+ */
+
+#define AD7746_REG_CAP_DATA_HIGH 1
+#define AD7746_REG_VT_DATA_HIGH 4
+#define AD7746_REG_CAP_SETUP 7
+#define AD7746_REG_VT_SETUP 8
+#define AD7746_REG_EXC_SETUP 9
+#define AD7746_REG_CFG 10
+#define AD7746_REG_CAPDACA 11
+#define AD7746_REG_CAPDACB 12
+#define AD7746_REG_CAP_OFFH 13
+#define AD7746_REG_CAP_GAINH 15
+#define AD7746_REG_VOLT_GAINH 17
+
+/* Capacitive Channel Setup Register Bit Designations (AD7746_REG_CAP_SETUP) */
+#define AD7746_CAPSETUP_CAPEN BIT(7)
+#define AD7746_CAPSETUP_CIN2 BIT(6) /* AD7746 only */
+#define AD7746_CAPSETUP_CAPDIFF BIT(5)
+#define AD7746_CAPSETUP_CACHOP BIT(0)
+
+/* Voltage/Temperature Setup Register Bit Designations (AD7746_REG_VT_SETUP) */
+#define AD7746_VTSETUP_VTEN (1 << 7)
+#define AD7746_VTSETUP_VTMD_INT_TEMP (0 << 5)
+#define AD7746_VTSETUP_VTMD_EXT_TEMP (1 << 5)
+#define AD7746_VTSETUP_VTMD_VDD_MON (2 << 5)
+#define AD7746_VTSETUP_VTMD_EXT_VIN (3 << 5)
+#define AD7746_VTSETUP_EXTREF BIT(4)
+#define AD7746_VTSETUP_VTSHORT BIT(1)
+#define AD7746_VTSETUP_VTCHOP BIT(0)
+
+/* Excitation Setup Register Bit Designations (AD7746_REG_EXC_SETUP) */
+#define AD7746_EXCSETUP_CLKCTRL BIT(7)
+#define AD7746_EXCSETUP_EXCON BIT(6)
+#define AD7746_EXCSETUP_EXCB BIT(5)
+#define AD7746_EXCSETUP_NEXCB BIT(4)
+#define AD7746_EXCSETUP_EXCA BIT(3)
+#define AD7746_EXCSETUP_NEXCA BIT(2)
+#define AD7746_EXCSETUP_EXCLVL(x) (((x) & 0x3) << 0)
+
+/* Config Register Bit Designations (AD7746_REG_CFG) */
+#define AD7746_CONF_VTFS_SHIFT 6
+#define AD7746_CONF_CAPFS_SHIFT 3
+#define AD7746_CONF_VTFS_MASK GENMASK(7, 6)
+#define AD7746_CONF_CAPFS_MASK GENMASK(5, 3)
+#define AD7746_CONF_MODE_IDLE (0 << 0)
+#define AD7746_CONF_MODE_CONT_CONV (1 << 0)
+#define AD7746_CONF_MODE_SINGLE_CONV (2 << 0)
+#define AD7746_CONF_MODE_PWRDN (3 << 0)
+#define AD7746_CONF_MODE_OFFS_CAL (5 << 0)
+#define AD7746_CONF_MODE_GAIN_CAL (6 << 0)
+
+/* CAPDAC Register Bit Designations (AD7746_REG_CAPDACx) */
+#define AD7746_CAPDAC_DACEN BIT(7)
+#define AD7746_CAPDAC_DACP(x) ((x) & 0x7F)
+
+/*
+ * struct ad7746_chip_info - chip specific information
+ */
+
+struct ad7746_chip_info {
+ struct i2c_client *client;
+ struct mutex lock; /* protect sensor state */
+ /*
+ * Capacitive channel digital filter setup;
+ * conversion time/update rate setup per channel
+ */
+ u8 config;
+ u8 cap_setup;
+ u8 vt_setup;
+ u8 capdac[2][2];
+ s8 capdac_set;
+
+ union {
+ __be32 d32;
+ u8 d8[4];
+ } data ____cacheline_aligned;
+};
+
+enum ad7746_chan {
+ VIN,
+ VIN_VDD,
+ TEMP_INT,
+ TEMP_EXT,
+ CIN1,
+ CIN1_DIFF,
+ CIN2,
+ CIN2_DIFF,
+};
+
+static const struct iio_chan_spec ad7746_channels[] = {
+ [VIN] = {
+ .type = IIO_VOLTAGE,
+ .indexed = 1,
+ .channel = 0,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ .address = AD7746_REG_VT_DATA_HIGH << 8 |
+ AD7746_VTSETUP_VTMD_EXT_VIN,
+ },
+ [VIN_VDD] = {
+ .type = IIO_VOLTAGE,
+ .indexed = 1,
+ .channel = 1,
+ .extend_name = "supply",
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ .address = AD7746_REG_VT_DATA_HIGH << 8 |
+ AD7746_VTSETUP_VTMD_VDD_MON,
+ },
+ [TEMP_INT] = {
+ .type = IIO_TEMP,
+ .indexed = 1,
+ .channel = 0,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ .address = AD7746_REG_VT_DATA_HIGH << 8 |
+ AD7746_VTSETUP_VTMD_INT_TEMP,
+ },
+ [TEMP_EXT] = {
+ .type = IIO_TEMP,
+ .indexed = 1,
+ .channel = 1,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ .address = AD7746_REG_VT_DATA_HIGH << 8 |
+ AD7746_VTSETUP_VTMD_EXT_TEMP,
+ },
+ [CIN1] = {
+ .type = IIO_CAPACITANCE,
+ .indexed = 1,
+ .channel = 0,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_CALIBSCALE) | BIT(IIO_CHAN_INFO_OFFSET),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBBIAS) |
+ BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ .address = AD7746_REG_CAP_DATA_HIGH << 8,
+ },
+ [CIN1_DIFF] = {
+ .type = IIO_CAPACITANCE,
+ .differential = 1,
+ .indexed = 1,
+ .channel = 0,
+ .channel2 = 2,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_CALIBSCALE) | BIT(IIO_CHAN_INFO_OFFSET),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBBIAS) |
+ BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ .address = AD7746_REG_CAP_DATA_HIGH << 8 |
+ AD7746_CAPSETUP_CAPDIFF
+ },
+ [CIN2] = {
+ .type = IIO_CAPACITANCE,
+ .indexed = 1,
+ .channel = 1,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_CALIBSCALE) | BIT(IIO_CHAN_INFO_OFFSET),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBBIAS) |
+ BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ .address = AD7746_REG_CAP_DATA_HIGH << 8 |
+ AD7746_CAPSETUP_CIN2,
+ },
+ [CIN2_DIFF] = {
+ .type = IIO_CAPACITANCE,
+ .differential = 1,
+ .indexed = 1,
+ .channel = 1,
+ .channel2 = 3,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_CALIBSCALE) | BIT(IIO_CHAN_INFO_OFFSET),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBBIAS) |
+ BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ .address = AD7746_REG_CAP_DATA_HIGH << 8 |
+ AD7746_CAPSETUP_CAPDIFF | AD7746_CAPSETUP_CIN2,
+ }
+};
+
+/* Values are Update Rate (Hz), Conversion Time (ms) + 1*/
+static const unsigned char ad7746_vt_filter_rate_table[][2] = {
+ {50, 20 + 1}, {31, 32 + 1}, {16, 62 + 1}, {8, 122 + 1},
+};
+
+static const unsigned char ad7746_cap_filter_rate_table[][2] = {
+ {91, 11 + 1}, {84, 12 + 1}, {50, 20 + 1}, {26, 38 + 1},
+ {16, 62 + 1}, {13, 77 + 1}, {11, 92 + 1}, {9, 110 + 1},
+};
+
+static int ad7746_select_channel(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan)
+{
+ struct ad7746_chip_info *chip = iio_priv(indio_dev);
+ u8 vt_setup, cap_setup;
+ int ret, delay, idx;
+
+ switch (chan->type) {
+ case IIO_CAPACITANCE:
+ cap_setup = (chan->address & 0xFF) | AD7746_CAPSETUP_CAPEN;
+ vt_setup = chip->vt_setup & ~AD7746_VTSETUP_VTEN;
+ idx = (chip->config & AD7746_CONF_CAPFS_MASK) >>
+ AD7746_CONF_CAPFS_SHIFT;
+ delay = ad7746_cap_filter_rate_table[idx][1];
+
+ if (chip->capdac_set != chan->channel) {
+ ret = i2c_smbus_write_byte_data(chip->client,
+ AD7746_REG_CAPDACA,
+ chip->capdac[chan->channel][0]);
+ if (ret < 0)
+ return ret;
+ ret = i2c_smbus_write_byte_data(chip->client,
+ AD7746_REG_CAPDACB,
+ chip->capdac[chan->channel][1]);
+ if (ret < 0)
+ return ret;
+
+ chip->capdac_set = chan->channel;
+ }
+ break;
+ case IIO_VOLTAGE:
+ case IIO_TEMP:
+ vt_setup = (chan->address & 0xFF) | AD7746_VTSETUP_VTEN;
+ cap_setup = chip->cap_setup & ~AD7746_CAPSETUP_CAPEN;
+ idx = (chip->config & AD7746_CONF_VTFS_MASK) >>
+ AD7746_CONF_VTFS_SHIFT;
+ delay = ad7746_cap_filter_rate_table[idx][1];
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (chip->cap_setup != cap_setup) {
+ ret = i2c_smbus_write_byte_data(chip->client,
+ AD7746_REG_CAP_SETUP,
+ cap_setup);
+ if (ret < 0)
+ return ret;
+
+ chip->cap_setup = cap_setup;
+ }
+
+ if (chip->vt_setup != vt_setup) {
+ ret = i2c_smbus_write_byte_data(chip->client,
+ AD7746_REG_VT_SETUP,
+ vt_setup);
+ if (ret < 0)
+ return ret;
+
+ chip->vt_setup = vt_setup;
+ }
+
+ return delay;
+}
+
+static inline ssize_t ad7746_start_calib(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len,
+ u8 regval)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct ad7746_chip_info *chip = iio_priv(indio_dev);
+ int ret, timeout = 10;
+ bool doit;
+
+ ret = strtobool(buf, &doit);
+ if (ret < 0)
+ return ret;
+
+ if (!doit)
+ return 0;
+
+ mutex_lock(&chip->lock);
+ regval |= chip->config;
+ ret = i2c_smbus_write_byte_data(chip->client, AD7746_REG_CFG, regval);
+ if (ret < 0)
+ goto unlock;
+
+ do {
+ msleep(20);
+ ret = i2c_smbus_read_byte_data(chip->client, AD7746_REG_CFG);
+ if (ret < 0)
+ goto unlock;
+
+ } while ((ret == regval) && timeout--);
+
+ mutex_unlock(&chip->lock);
+
+ return len;
+
+unlock:
+ mutex_unlock(&chip->lock);
+ return ret;
+}
+
+static ssize_t ad7746_start_offset_calib(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ int ret = ad7746_select_channel(indio_dev,
+ &ad7746_channels[to_iio_dev_attr(attr)->address]);
+ if (ret < 0)
+ return ret;
+
+ return ad7746_start_calib(dev, attr, buf, len,
+ AD7746_CONF_MODE_OFFS_CAL);
+}
+
+static ssize_t ad7746_start_gain_calib(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ int ret = ad7746_select_channel(indio_dev,
+ &ad7746_channels[to_iio_dev_attr(attr)->address]);
+ if (ret < 0)
+ return ret;
+
+ return ad7746_start_calib(dev, attr, buf, len,
+ AD7746_CONF_MODE_GAIN_CAL);
+}
+
+static IIO_DEVICE_ATTR(in_capacitance0_calibbias_calibration,
+ 0200, NULL, ad7746_start_offset_calib, CIN1);
+static IIO_DEVICE_ATTR(in_capacitance1_calibbias_calibration,
+ 0200, NULL, ad7746_start_offset_calib, CIN2);
+static IIO_DEVICE_ATTR(in_capacitance0_calibscale_calibration,
+ 0200, NULL, ad7746_start_gain_calib, CIN1);
+static IIO_DEVICE_ATTR(in_capacitance1_calibscale_calibration,
+ 0200, NULL, ad7746_start_gain_calib, CIN2);
+static IIO_DEVICE_ATTR(in_voltage0_calibscale_calibration,
+ 0200, NULL, ad7746_start_gain_calib, VIN);
+
+static int ad7746_store_cap_filter_rate_setup(struct ad7746_chip_info *chip,
+ int val)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ad7746_cap_filter_rate_table); i++)
+ if (val >= ad7746_cap_filter_rate_table[i][0])
+ break;
+
+ if (i >= ARRAY_SIZE(ad7746_cap_filter_rate_table))
+ i = ARRAY_SIZE(ad7746_cap_filter_rate_table) - 1;
+
+ chip->config &= ~AD7746_CONF_CAPFS_MASK;
+ chip->config |= i << AD7746_CONF_CAPFS_SHIFT;
+
+ return 0;
+}
+
+static int ad7746_store_vt_filter_rate_setup(struct ad7746_chip_info *chip,
+ int val)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ad7746_vt_filter_rate_table); i++)
+ if (val >= ad7746_vt_filter_rate_table[i][0])
+ break;
+
+ if (i >= ARRAY_SIZE(ad7746_vt_filter_rate_table))
+ i = ARRAY_SIZE(ad7746_vt_filter_rate_table) - 1;
+
+ chip->config &= ~AD7746_CONF_VTFS_MASK;
+ chip->config |= i << AD7746_CONF_VTFS_SHIFT;
+
+ return 0;
+}
+
+static IIO_CONST_ATTR(in_voltage_sampling_frequency_available, "50 31 16 8");
+static IIO_CONST_ATTR(in_capacitance_sampling_frequency_available,
+ "91 84 50 26 16 13 11 9");
+
+static struct attribute *ad7746_attributes[] = {
+ &iio_dev_attr_in_capacitance0_calibbias_calibration.dev_attr.attr,
+ &iio_dev_attr_in_capacitance0_calibscale_calibration.dev_attr.attr,
+ &iio_dev_attr_in_capacitance1_calibscale_calibration.dev_attr.attr,
+ &iio_dev_attr_in_capacitance1_calibbias_calibration.dev_attr.attr,
+ &iio_dev_attr_in_voltage0_calibscale_calibration.dev_attr.attr,
+ &iio_const_attr_in_voltage_sampling_frequency_available.dev_attr.attr,
+ &iio_const_attr_in_capacitance_sampling_frequency_available.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group ad7746_attribute_group = {
+ .attrs = ad7746_attributes,
+};
+
+static int ad7746_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val,
+ int val2,
+ long mask)
+{
+ struct ad7746_chip_info *chip = iio_priv(indio_dev);
+ int ret, reg;
+
+ mutex_lock(&chip->lock);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_CALIBSCALE:
+ if (val != 1) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* 2^16 in micro */
+ val = (val2 * 1024) / 15625;
+
+ switch (chan->type) {
+ case IIO_CAPACITANCE:
+ reg = AD7746_REG_CAP_GAINH;
+ break;
+ case IIO_VOLTAGE:
+ reg = AD7746_REG_VOLT_GAINH;
+ break;
+ default:
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = i2c_smbus_write_word_swapped(chip->client, reg, val);
+ if (ret < 0)
+ goto out;
+
+ ret = 0;
+ break;
+ case IIO_CHAN_INFO_CALIBBIAS:
+ if (val < 0 || val > 0xFFFF) {
+ ret = -EINVAL;
+ goto out;
+ }
+ ret = i2c_smbus_write_word_swapped(chip->client,
+ AD7746_REG_CAP_OFFH, val);
+ if (ret < 0)
+ goto out;
+
+ ret = 0;
+ break;
+ case IIO_CHAN_INFO_OFFSET:
+ if (val < 0 || val > 43008000) { /* 21pF */
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /*
+ * CAPDAC Scale = 21pF_typ / 127
+ * CIN Scale = 8.192pF / 2^24
+ * Offset Scale = CAPDAC Scale / CIN Scale = 338646
+ */
+
+ val /= 338646;
+
+ chip->capdac[chan->channel][chan->differential] = val > 0 ?
+ AD7746_CAPDAC_DACP(val) | AD7746_CAPDAC_DACEN : 0;
+
+ ret = i2c_smbus_write_byte_data(chip->client,
+ AD7746_REG_CAPDACA,
+ chip->capdac[chan->channel][0]);
+ if (ret < 0)
+ goto out;
+ ret = i2c_smbus_write_byte_data(chip->client,
+ AD7746_REG_CAPDACB,
+ chip->capdac[chan->channel][1]);
+ if (ret < 0)
+ goto out;
+
+ chip->capdac_set = chan->channel;
+
+ ret = 0;
+ break;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ if (val2) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ switch (chan->type) {
+ case IIO_CAPACITANCE:
+ ret = ad7746_store_cap_filter_rate_setup(chip, val);
+ break;
+ case IIO_VOLTAGE:
+ ret = ad7746_store_vt_filter_rate_setup(chip, val);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+out:
+ mutex_unlock(&chip->lock);
+ return ret;
+}
+
+static int ad7746_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2,
+ long mask)
+{
+ struct ad7746_chip_info *chip = iio_priv(indio_dev);
+ int ret, delay, idx;
+ u8 regval, reg;
+
+ mutex_lock(&chip->lock);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ case IIO_CHAN_INFO_PROCESSED:
+ ret = ad7746_select_channel(indio_dev, chan);
+ if (ret < 0)
+ goto out;
+ delay = ret;
+
+ regval = chip->config | AD7746_CONF_MODE_SINGLE_CONV;
+ ret = i2c_smbus_write_byte_data(chip->client, AD7746_REG_CFG,
+ regval);
+ if (ret < 0)
+ goto out;
+
+ msleep(delay);
+ /* Now read the actual register */
+
+ ret = i2c_smbus_read_i2c_block_data(chip->client,
+ chan->address >> 8, 3,
+ &chip->data.d8[1]);
+
+ if (ret < 0)
+ goto out;
+
+ /*
+ * Either for Capacitance, Voltage or Temperature,
+ * the 0x000000 code represents negative full scale,
+ * the 0x800000 code represents zero scale, and
+ * the 0xFFFFFF code represents positive full scale.
+ */
+
+ *val = (be32_to_cpu(chip->data.d32) & 0xFFFFFF) - 0x800000;
+
+ switch (chan->type) {
+ case IIO_TEMP:
+ /*
+ * temperature in milli degrees Celsius
+ * T = ((*val / 2048) - 4096) * 1000
+ */
+ *val = (*val * 125) / 256;
+ break;
+ case IIO_VOLTAGE:
+
+ /*
+ * The voltage from the VDD pin is internally
+ * attenuated by 6.
+ */
+
+ if (chan->channel == 1) /* supply_raw */
+ *val = *val * 6;
+ break;
+ default:
+ break;
+ }
+
+ ret = IIO_VAL_INT;
+ break;
+ case IIO_CHAN_INFO_CALIBSCALE:
+ switch (chan->type) {
+ case IIO_CAPACITANCE:
+ reg = AD7746_REG_CAP_GAINH;
+ break;
+ case IIO_VOLTAGE:
+ reg = AD7746_REG_VOLT_GAINH;
+ break;
+ default:
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = i2c_smbus_read_word_swapped(chip->client, reg);
+ if (ret < 0)
+ goto out;
+ /* 1 + gain_val / 2^16 */
+ *val = 1;
+ *val2 = (15625 * ret) / 1024;
+
+ ret = IIO_VAL_INT_PLUS_MICRO;
+ break;
+ case IIO_CHAN_INFO_CALIBBIAS:
+ ret = i2c_smbus_read_word_swapped(chip->client,
+ AD7746_REG_CAP_OFFH);
+ if (ret < 0)
+ goto out;
+ *val = ret;
+
+ ret = IIO_VAL_INT;
+ break;
+ case IIO_CHAN_INFO_OFFSET:
+
+ /*
+ * CAPDAC Scale = 21pF_typ / 127
+ * CIN Scale = 8.192pF / 2^24
+ * Offset Scale = CAPDAC Scale / CIN Scale = 338646
+ */
+
+ *val = AD7746_CAPDAC_DACP(chip->capdac[chan->channel]
+ [chan->differential]) * 338646;
+
+ ret = IIO_VAL_INT;
+ break;
+ case IIO_CHAN_INFO_SCALE:
+ switch (chan->type) {
+ case IIO_CAPACITANCE:
+ /* CIN Scale: 8.192pf / 2^24 */
+ *val = 0;
+ *val2 = 488;
+ ret = IIO_VAL_INT_PLUS_NANO;
+ break;
+ case IIO_VOLTAGE:
+ /* VIN Scale: 1170mV / 2^23 */
+ *val = 1170;
+ *val2 = 23;
+ ret = IIO_VAL_FRACTIONAL_LOG2;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ break;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ switch (chan->type) {
+ case IIO_CAPACITANCE:
+ idx = (chip->config & AD7746_CONF_CAPFS_MASK) >>
+ AD7746_CONF_CAPFS_SHIFT;
+ *val = ad7746_cap_filter_rate_table[idx][0];
+ ret = IIO_VAL_INT;
+ break;
+ case IIO_VOLTAGE:
+ idx = (chip->config & AD7746_CONF_VTFS_MASK) >>
+ AD7746_CONF_VTFS_SHIFT;
+ *val = ad7746_vt_filter_rate_table[idx][0];
+ ret = IIO_VAL_INT;
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ break;
+ default:
+ ret = -EINVAL;
+ }
+out:
+ mutex_unlock(&chip->lock);
+ return ret;
+}
+
+static const struct iio_info ad7746_info = {
+ .attrs = &ad7746_attribute_group,
+ .read_raw = ad7746_read_raw,
+ .write_raw = ad7746_write_raw,
+};
+
+/*
+ * device probe and remove
+ */
+#ifdef CONFIG_OF
+static struct ad7746_platform_data *ad7746_parse_dt(struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ struct ad7746_platform_data *pdata;
+ unsigned int tmp;
+ int ret;
+
+ /*
+ * The default excitation outputs are not inverted, it should be stated
+ * in the dt if needed.
+ */
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return NULL;
+
+ ret = of_property_read_u32(np, "adi,exclvl", &tmp);
+ if (ret || tmp > 3) {
+ dev_warn(dev, "Wrong exclvl value, using default\n");
+ pdata->exclvl = 3;
+ } else {
+ pdata->exclvl = tmp;
+ }
+
+ pdata->exca_en = true;
+ pdata->excb_en = true;
+ pdata->exca_inv_en = of_property_read_bool(np, "adi,nexca_en");
+ pdata->excb_inv_en = of_property_read_bool(np, "adi,nexcb_en");
+
+ return pdata;
+}
+#else
+static struct ad7746_platform_data *ad7746_parse_dt(struct device *dev)
+{
+ return NULL;
+}
+#endif
+
+static int ad7746_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct ad7746_platform_data *pdata = client->dev.platform_data;
+ struct ad7746_chip_info *chip;
+ struct iio_dev *indio_dev;
+ unsigned char regval = 0;
+ int ret = 0;
+
+ if (client->dev.of_node)
+ pdata = ad7746_parse_dt(&client->dev);
+ else
+ pdata = client->dev.platform_data;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
+ if (!indio_dev)
+ return -ENOMEM;
+ chip = iio_priv(indio_dev);
+ mutex_init(&chip->lock);
+ /* this is only used for device removal purposes */
+ i2c_set_clientdata(client, indio_dev);
+
+ chip->client = client;
+ chip->capdac_set = -1;
+
+ /* Establish that the iio_dev is a child of the i2c device */
+ indio_dev->name = id->name;
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->info = &ad7746_info;
+ indio_dev->channels = ad7746_channels;
+ if (id->driver_data == 7746)
+ indio_dev->num_channels = ARRAY_SIZE(ad7746_channels);
+ else
+ indio_dev->num_channels = ARRAY_SIZE(ad7746_channels) - 2;
+ indio_dev->num_channels = ARRAY_SIZE(ad7746_channels);
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ if (pdata) {
+ if (pdata->exca_en) {
+ if (pdata->exca_inv_en)
+ regval |= AD7746_EXCSETUP_NEXCA;
+ else
+ regval |= AD7746_EXCSETUP_EXCA;
+ }
+
+ if (pdata->excb_en) {
+ if (pdata->excb_inv_en)
+ regval |= AD7746_EXCSETUP_NEXCB;
+ else
+ regval |= AD7746_EXCSETUP_EXCB;
+ }
+
+ regval |= AD7746_EXCSETUP_EXCLVL(pdata->exclvl);
+ } else {
+ dev_warn(&client->dev, "No platform data? using default\n");
+ regval = AD7746_EXCSETUP_EXCA | AD7746_EXCSETUP_EXCB |
+ AD7746_EXCSETUP_EXCLVL(3);
+ }
+
+ ret = i2c_smbus_write_byte_data(chip->client,
+ AD7746_REG_EXC_SETUP, regval);
+ if (ret < 0)
+ return ret;
+
+ ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int ad7746_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct ad7746_chip_info *chip = iio_priv(indio_dev);
+ unsigned char regval;
+ int ret;
+
+ mutex_lock(&chip->lock);
+
+ regval = chip->config | AD7746_CONF_MODE_PWRDN;
+ ret = i2c_smbus_write_byte_data(chip->client, AD7746_REG_CFG, regval);
+
+ mutex_unlock(&chip->lock);
+
+ if (ret < 0) {
+ dev_warn(&client->dev, "Could NOT Power Down!\n");
+ goto out;
+ }
+
+ iio_device_unregister(indio_dev);
+
+out:
+ return ret;
+}
+
+static const struct i2c_device_id ad7746_id[] = {
+ { "ad7745", 7745 },
+ { "ad7746", 7746 },
+ { "ad7747", 7747 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, ad7746_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id ad7746_of_match[] = {
+ { .compatible = "adi,ad7745" },
+ { .compatible = "adi,ad7746" },
+ { .compatible = "adi,ad7747" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ad7746_of_match);
+#endif
+
+static struct i2c_driver ad7746_driver = {
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = of_match_ptr(ad7746_of_match),
+ },
+ .probe = ad7746_probe,
+ .remove = ad7746_remove,
+ .id_table = ad7746_id,
+};
+module_i2c_driver(ad7746_driver);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@xxxxxxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Analog Devices AD7746/5/7 capacitive sensor driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/iio/cdc/ad7746.h b/include/linux/iio/cdc/ad7746.h
new file mode 100644
index 0000000..46ff25e
--- /dev/null
+++ b/include/linux/iio/cdc/ad7746.h
@@ -0,0 +1,20 @@
+/*
+ * AD7746 capacitive sensor driver supporting AD7745, AD7746 and AD7747
+ *
+ * Copyright 2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ */
+
+#ifndef IIO_CDC_AD7746_H_
+#define IIO_CDC_AD7746_H_
+
+struct ad7746_platform_data {
+ unsigned char exclvl; /*Excitation Voltage Level */
+ bool exca_en; /* enables EXCA pin as the excitation output */
+ bool exca_inv_en; /* enables /EXCA pin as the excitation output */
+ bool excb_en; /* enables EXCB pin as the excitation output */
+ bool excb_inv_en; /* enables /EXCB pin as the excitation output */
+};
+
+#endif /* IIO_CDC_AD7746_H_ */
--
2.7.4
--
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