One quick nitpick on submission format:
Please put version in the email subject
[PATCH V3] iio:...
That way it's easy to spot which one to bother reading ;)
On 09/16/11 15:47, michael.hennerich@xxxxxxxxxx wrote:
> From: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
>
> The existing ad7745 driver didn't conform with the IIO spec for such devices.
> It was way simpler to rewrite the existing driver, than actually fixing it.
>
> Changes since V1:
>
> Fix file header description.
> Fix erroneous defines.
> Pin channels to expected places in the iio_chan_spec array, to avoid magic numbers.
> Use msleep instead of busy waiting mdelay.
> Fix indention style.
> Drop _bias and use _offset attribute.
>
> Changes since V2:
> Increase accuracy of cap scale.
> Fix channel spec for VIN.
Some formatting nitpicks. I'll fix them up.
I don't think Greg's tree is visible anywhere so I'll pull this through mine
and push on to him. Thanks,
>
> Signed-off-by: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxx>
> ---
> drivers/staging/iio/adc/Kconfig | 2 +-
> drivers/staging/iio/adc/Makefile | 2 +-
> drivers/staging/iio/adc/ad7745.c | 672 --------------------------------
> drivers/staging/iio/adc/ad7746.c | 800 ++++++++++++++++++++++++++++++++++++++
> drivers/staging/iio/adc/ad7746.h | 29 ++
> 5 files changed, 831 insertions(+), 674 deletions(-)
> delete mode 100644 drivers/staging/iio/adc/ad7745.c
> create mode 100644 drivers/staging/iio/adc/ad7746.c
> create mode 100644 drivers/staging/iio/adc/ad7746.h
>
> diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig
> index 7867ab1..0482073 100644
> --- a/drivers/staging/iio/adc/Kconfig
> +++ b/drivers/staging/iio/adc/Kconfig
> @@ -144,7 +144,7 @@ config AD7793
> To compile this driver as a module, choose M here: the
> module will be called AD7793.
>
> -config AD7745
> +config AD7746
> tristate "Analog Devices AD7745, AD7746 AD7747 capacitive sensor driver"
> depends on I2C
> help
... snip old driver out as we don't care ;)....
> diff --git a/drivers/staging/iio/adc/ad7746.c b/drivers/staging/iio/adc/ad7746.c
> new file mode 100644
> index 0000000..b2011f5
> --- /dev/null
> +++ b/drivers/staging/iio/adc/ad7746.c
> @@ -0,0 +1,800 @@
> +/*
> + * AD7746 capacitive sensor driver supporting AD7745, AD7746 and AD7747
> + *
> + * Copyright 2011 Analog Devices Inc.
> + *
> + * Licensed under the GPL-2.
> + */
> +
> +#include <linux/interrupt.h>
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/sysfs.h>
> +#include <linux/i2c.h>
> +#include <linux/delay.h>
> +
> +#include "../iio.h"
> +#include "../sysfs.h"
> +
> +#include "ad7746.h"
> +
> +/*
> + * AD7746 Register Definition
> + */
> +
> +#define AD7746_REG_STATUS 0
> +#define AD7746_REG_CAP_DATA_HIGH 1
> +#define AD7746_REG_CAP_DATA_MID 2
> +#define AD7746_REG_CAP_DATA_LOW 3
> +#define AD7746_REG_VT_DATA_HIGH 4
> +#define AD7746_REG_VT_DATA_MID 5
> +#define AD7746_REG_VT_DATA_LOW 6
> +#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_OFFL 14
> +#define AD7746_REG_CAP_GAINH 15
> +#define AD7746_REG_CAP_GAINL 16
> +#define AD7746_REG_VOLT_GAINH 17
> +#define AD7746_REG_VOLT_GAINL 18
> +
> +/* Status Register Bit Designations (AD7746_REG_STATUS) */
> +#define AD7746_STATUS_EXCERR (1 << 3)
> +#define AD7746_STATUS_RDY (1 << 2)
> +#define AD7746_STATUS_RDYVT (1 << 1)
> +#define AD7746_STATUS_RDYCAP (1 << 0)
> +
> +/* Capacitive Channel Setup Register Bit Designations (AD7746_REG_CAP_SETUP) */
> +#define AD7746_CAPSETUP_CAPEN (1 << 7)
> +#define AD7746_CAPSETUP_CIN2 (1 << 6) /* AD7746 only */
> +#define AD7746_CAPSETUP_CAPDIFF (1 << 5)
> +#define AD7746_CAPSETUP_CACHOP (1 << 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 (1 << 4)
> +#define AD7746_VTSETUP_VTSHORT (1 << 1)
> +#define AD7746_VTSETUP_VTCHOP (1 << 0)
> +
> +/* Excitation Setup Register Bit Designations (AD7746_REG_EXC_SETUP) */
> +#define AD7746_EXCSETUP_CLKCTRL (1 << 7)
> +#define AD7746_EXCSETUP_EXCON (1 << 6)
> +#define AD7746_EXCSETUP_EXCB (1 << 5)
> +#define AD7746_EXCSETUP_NEXCB (1 << 4)
> +#define AD7746_EXCSETUP_EXCA (1 << 3)
> +#define AD7746_EXCSETUP_NEXCA (1 << 2)
> +#define AD7746_EXCSETUP_EXCLVL(x) (((x) & 0x3) << 0)
> +
> +/* Config Register Bit Designations (AD7746_REG_CFG) */
> +#define AD7746_CONF_VTFS(x) ((x) << 6)
> +#define AD7746_CONF_CAPFS(x) ((x) << 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 (1 << 7)
> +#define AD7746_CAPDAC_DACP(x) ((x) & 0x7F)
> +
> +/*
> + * struct ad7746_chip_info - chip specifc information
> + */
> +
> +struct ad7746_chip_info {
> + struct i2c_client *client;
> + /*
> + * 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;
> +};
> +
> +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 = (1 << IIO_CHAN_INFO_SCALE_SHARED),
> + .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 = (1 << IIO_CHAN_INFO_SCALE_SHARED),
> + .address = AD7746_REG_VT_DATA_HIGH << 8 |
> + AD7746_VTSETUP_VTMD_VDD_MON,
> + },
> + [TEMP_INT] = {
> + .type = IIO_TEMP,
> + .indexed = 1,
> + .channel = 0,
> + .processed_val = IIO_PROCESSED,
> + .address = AD7746_REG_VT_DATA_HIGH << 8 |
> + AD7746_VTSETUP_VTMD_INT_TEMP,
> + },
> + [TEMP_EXT] = {
> + .type = IIO_TEMP,
> + .indexed = 1,
> + .channel = 1,
> + .processed_val = IIO_PROCESSED,
> + .address = AD7746_REG_VT_DATA_HIGH << 8 |
> + AD7746_VTSETUP_VTMD_EXT_TEMP,
> + },
> + [CIN1] = {
> + .type = IIO_CAPACITANCE,
> + .indexed = 1,
> + .channel = 0,
> + .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) |
> + (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED) |
> + (1 << IIO_CHAN_INFO_OFFSET_SEPARATE) |
> + (1 << IIO_CHAN_INFO_SCALE_SHARED),
> + .address = AD7746_REG_CAP_DATA_HIGH << 8,
> + },
> + [CIN1_DIFF] = {
> + .type = IIO_CAPACITANCE,
> + .differential = 1,
> + .indexed = 1,
> + .channel = 0,
> + .channel2 = 2,
> + .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) |
> + (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED) |
> + (1 << IIO_CHAN_INFO_OFFSET_SEPARATE) |
> + (1 << IIO_CHAN_INFO_SCALE_SHARED),
> + .address = AD7746_REG_CAP_DATA_HIGH << 8 |
> + AD7746_CAPSETUP_CAPDIFF
> + },
> + [CIN2] = {
> + .type = IIO_CAPACITANCE,
> + .indexed = 1,
> + .channel = 1,
> + .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) |
> + (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED) |
> + (1 << IIO_CHAN_INFO_OFFSET_SEPARATE) |
> + (1 << IIO_CHAN_INFO_SCALE_SHARED),
> + .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 = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) |
> + (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED) |
> + (1 << IIO_CHAN_INFO_OFFSET_SEPARATE) |
> + (1 << IIO_CHAN_INFO_SCALE_SHARED),
> + .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);
> + int ret, delay;
> + u8 vt_setup, cap_setup;
> +
> + switch (chan->type) {
> + case IIO_CAPACITANCE:
> + cap_setup = (chan->address & 0xFF) | AD7746_CAPSETUP_CAPEN;
> + vt_setup = chip->vt_setup & ~AD7746_VTSETUP_VTEN;
> + delay = ad7746_cap_filter_rate_table[(chip->config >> 3) &
> + 0x7][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;
> + delay = ad7746_cap_filter_rate_table[(chip->config >> 6) &
> + 0x3][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_get_drvdata(dev);
> + struct ad7746_chip_info *chip = iio_priv(indio_dev);
> + bool doit;
> + int ret, timeout = 10;
> +
> + ret = strtobool(buf, &doit);
> + if (ret < 0)
> + return ret;
> +
> + if (!doit)
> + return 0;
> +
> + mutex_lock(&indio_dev->mlock);
> + regval |= chip->config;
> + ret = i2c_smbus_write_byte_data(chip->client, AD7746_REG_CFG, regval);
> + if (ret < 0) {
> + mutex_unlock(&indio_dev->mlock);
> + return ret;
> + }
> +
> + do {
> + msleep(20);
> + ret = i2c_smbus_read_byte_data(chip->client, AD7746_REG_CFG);
> + if (ret < 0) {
> + mutex_unlock(&indio_dev->mlock);
> + return ret;
> + }
> + } while ((ret == regval) && timeout--);
> +
> + mutex_unlock(&indio_dev->mlock);
> + return len;
> +}
Blank line here please.
> +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_get_drvdata(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);
> +}
Blank line.
> +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_get_drvdata(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,
> + S_IWUSR, NULL, ad7746_start_offset_calib, CIN1);
> +static IIO_DEVICE_ATTR(in_capacitance1_calibbias_calibration,
> + S_IWUSR, NULL, ad7746_start_offset_calib, CIN2);
> +static IIO_DEVICE_ATTR(in_capacitance0_calibscale_calibration,
> + S_IWUSR, NULL, ad7746_start_gain_calib, CIN1);
> +static IIO_DEVICE_ATTR(in_capacitance1_calibscale_calibration,
> + S_IWUSR, NULL, ad7746_start_gain_calib, CIN2);
> +static IIO_DEVICE_ATTR(in_voltage0_calibscale_calibration,
> + S_IWUSR, NULL, ad7746_start_gain_calib, VIN);
> +
> +static ssize_t ad7746_show_cap_filter_rate_setup(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct iio_dev *indio_dev = dev_get_drvdata(dev);
> + struct ad7746_chip_info *chip = iio_priv(indio_dev);
> +
> + return sprintf(buf, "%d\n", ad7746_cap_filter_rate_table[
> + (chip->config >> 3) & 0x7][0]);
> +}
> +
> +static ssize_t ad7746_store_cap_filter_rate_setup(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf,
> + size_t len)
> +{
> + struct iio_dev *indio_dev = dev_get_drvdata(dev);
> + struct ad7746_chip_info *chip = iio_priv(indio_dev);
> + u8 data;
> + int ret, i;
> +
> + ret = kstrtou8(buf, 10, &data);
> + if (ret < 0)
> + return ret;
> +
> + for (i = 0; i < ARRAY_SIZE(ad7746_cap_filter_rate_table); i++)
> + if (data >= 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;
> +
> + mutex_lock(&indio_dev->mlock);
> + chip->config &= ~AD7746_CONF_CAPFS(0x7);
> + chip->config |= AD7746_CONF_CAPFS(i);
> + mutex_unlock(&indio_dev->mlock);
> +
> + return len;
> +}
> +
> +static ssize_t ad7746_show_vt_filter_rate_setup(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct iio_dev *indio_dev = dev_get_drvdata(dev);
> + struct ad7746_chip_info *chip = iio_priv(indio_dev);
> +
> + return sprintf(buf, "%d\n", ad7746_vt_filter_rate_table[
> + (chip->config >> 6) & 0x3][0]);
> +}
> +
> +static ssize_t ad7746_store_vt_filter_rate_setup(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf,
> + size_t len)
> +{
> + struct iio_dev *indio_dev = dev_get_drvdata(dev);
> + struct ad7746_chip_info *chip = iio_priv(indio_dev);
> + u8 data;
> + int ret, i;
> +
> + ret = kstrtou8(buf, 10, &data);
> + if (ret < 0)
> + return ret;
> +
> + for (i = 0; i < ARRAY_SIZE(ad7746_vt_filter_rate_table); i++)
> + if (data >= 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;
> +
> + mutex_lock(&indio_dev->mlock);
> + chip->config &= ~AD7746_CONF_VTFS(0x3);
> + chip->config |= AD7746_CONF_VTFS(i);
> + mutex_unlock(&indio_dev->mlock);
> +
> + return len;
> +}
> +
> +static IIO_DEVICE_ATTR(in_capacitance_sampling_frequency,
> + S_IRUGO | S_IWUSR, ad7746_show_cap_filter_rate_setup,
> + ad7746_store_cap_filter_rate_setup, 0);
> +
> +static IIO_DEVICE_ATTR(in_voltage_sampling_frequency,
> + S_IRUGO | S_IWUSR, ad7746_show_vt_filter_rate_setup,
> + ad7746_store_vt_filter_rate_setup, 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_capacitance_sampling_frequency.dev_attr.attr,
> + &iio_dev_attr_in_voltage_sampling_frequency.dev_attr.attr,
> + &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(&indio_dev->mlock);
> +
> + switch (mask) {
> + case (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE):
> + if (val != 1) {
> + ret = -EINVAL;
> + goto out;
> + }
> +
> + 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_data(chip->client, reg, swab16(val));
> + if (ret < 0)
> + goto out;
> +
> + ret = 0;
> + break;
> + case (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED):
> + if ((val < 0) | (val > 0xFFFF)) {
> + ret = -EINVAL;
> + goto out;
> + }
> + ret = i2c_smbus_write_word_data(chip->client,
> + AD7746_REG_CAP_OFFH, swab16(val));
> + if (ret < 0)
> + goto out;
> +
> + ret = 0;
> + break;
> + case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE):
> + 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;
> + default:
> + ret = -EINVAL;
> + }
> +
> +out:
> + mutex_unlock(&indio_dev->mlock);
> + 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;
> + u8 regval, reg;
> +
> + union {
> + u32 d32;
> + u8 d8[4];
> + } data;
> +
> + mutex_lock(&indio_dev->mlock);
> +
> + switch (mask) {
> + case 0:
> + 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, &data.d8[1]);
> +
> + if (ret < 0)
> + goto out;
> +
> + *val = (be32_to_cpu(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:
> + if (chan->channel == 1) /* supply_raw*/
> + *val = *val * 6;
> + break;
> + default:
> + break;
> + }
> +
> + ret = IIO_VAL_INT;
> + break;
> + case (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE):
> + 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_data(chip->client, reg);
> + if (ret < 0)
> + goto out;
> + /* 1 + gain_val / 2^16 */
> + *val = 1;
> + *val2 = (15625 * swab16(ret)) / 1024;
> +
> + ret = IIO_VAL_INT_PLUS_MICRO;
> + break;
> + case (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED):
> + ret = i2c_smbus_read_word_data(chip->client,
> + AD7746_REG_CAP_OFFH);
> + if (ret < 0)
> + goto out;
> + *val = swab16(ret);
> +
> + ret = IIO_VAL_INT;
> + break;
> + case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE):
> + *val = AD7746_CAPDAC_DACP(chip->capdac[chan->channel]
> + [chan->differential]) * 338646;
> +
> + ret = IIO_VAL_INT;
> + break;
> + case (1 << IIO_CHAN_INFO_SCALE_SHARED):
> + switch (chan->type) {
> + case IIO_CAPACITANCE:
> + /* 8.192pf / 2^24 */
> + *val2 = 488;
> + *val = 0;
> + break;
> + case IIO_VOLTAGE:
> + /* 1170mV / 2^23 */
> + *val2 = 139475;
> + *val = 0;
> + break;
> + default:
> + ret = -EINVAL;
> + goto out;
> + }
> +
> + ret = IIO_VAL_INT_PLUS_NANO;
> + break;
> + default:
> + ret = -EINVAL;
> + };
> +out:
> + mutex_unlock(&indio_dev->mlock);
> + return ret;
> +}
> +
> +static const struct iio_info ad7746_info = {
> + .attrs = &ad7746_attribute_group,
> + .read_raw = &ad7746_read_raw,
> + .write_raw = &ad7746_write_raw,
> + .driver_module = THIS_MODULE,
> +};
> +
> +/*
> + * device probe and remove
> + */
> +
> +static int __devinit 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;
> + int ret = 0;
> + unsigned char regval = 0;
> +
> + indio_dev = iio_allocate_device(sizeof(*chip));
> + if (indio_dev == NULL) {
> + ret = -ENOMEM;
> + goto error_ret;
> + }
> + chip = iio_priv(indio_dev);
> + /* 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)
> + goto error_free_dev;
> +
> + ret = iio_device_register(indio_dev);
> + if (ret)
> + goto error_free_dev;
> +
> + dev_info(&client->dev, "%s capacitive sensor registered\n", id->name);
> +
> + return 0;
> +
> +error_free_dev:
> + iio_free_device(indio_dev);
> +error_ret:
> + return ret;
> +}
> +
> +static int __devexit ad7746_remove(struct i2c_client *client)
> +{
> + struct iio_dev *indio_dev = i2c_get_clientdata(client);
> +
> + iio_device_unregister(indio_dev);
> +
> + return 0;
> +}
> +
> +static const struct i2c_device_id ad7746_id[] = {
> + { "ad7745", 7745 },
> + { "ad7746", 7746 },
> + { "ad7747", 7747 },
> + {}
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, ad7746_id);
> +
> +static struct i2c_driver ad7746_driver = {
> + .driver = {
> + .name = KBUILD_MODNAME,
> + },
> + .probe = ad7746_probe,
> + .remove = __devexit_p(ad7746_remove),
> + .id_table = ad7746_id,
> +};
> +
> +static __init int ad7746_init(void)
> +{
> + return i2c_add_driver(&ad7746_driver);
> +}
> +
> +static __exit void ad7746_exit(void)
> +{
> + i2c_del_driver(&ad7746_driver);
> +}
> +
> +MODULE_AUTHOR("Michael Hennerich <hennerich@xxxxxxxxxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("Analog Devices AD7746/5/7 capacitive sensor driver");
> +MODULE_LICENSE("GPL v2");
> +
> +module_init(ad7746_init);
> +module_exit(ad7746_exit);
> diff --git a/drivers/staging/iio/adc/ad7746.h b/drivers/staging/iio/adc/ad7746.h
> new file mode 100644
> index 0000000..ea8572d
> --- /dev/null
> +++ b/drivers/staging/iio/adc/ad7746.h
> @@ -0,0 +1,29 @@
> +/*
> + * 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_
> +
> +/*
> + * TODO: struct ad7746_platform_data needs to go into include/linux/iio
> + */
> +
> +#define AD7466_EXCLVL_0 0 /* +-VDD/8 */
> +#define AD7466_EXCLVL_1 1 /* +-VDD/4 */
> +#define AD7466_EXCLVL_2 2 /* +-VDD * 3/8 */
> +#define AD7466_EXCLVL_3 3 /* +-VDD/2 */
> +
> +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_ */
--
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