/*
* AD7190 AD7192 AD7193 AD7195 SPI ADC driver
*
* Copyright 2011-2015 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/spi/spi.h>
#include <linux/regulator/consumer.h>
#include <linux/err.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/adc/ad_sigma_delta.h>
#include "ad7192.h"
/* Registers */
#define AD7192_REG_COMM 0 /* Communications Register (WO, 8-bit) */
#define AD7192_REG_STAT 0 /* Status Register (RO, 8-bit) */
#define AD7192_REG_MODE 1 /* Mode Register (RW, 24-bit */
#define AD7192_REG_CONF 2 /* Configuration Register (RW, 24-bit) */
#define AD7192_REG_DATA 3 /* Data Register (RO, 24/32-bit) */
#define AD7192_REG_ID 4 /* ID Register (RO, 8-bit) */
#define AD7192_REG_GPOCON 5 /* GPOCON Register (RO, 8-bit) */
#define AD7192_REG_OFFSET 6 /* Offset Register (RW, 16-bit
* (AD7792)/24-bit (AD7192)) */
#define AD7192_REG_FULLSALE 7 /* Full-Scale Register
* (RW, 16-bit (AD7792)/24-bit (AD7192)) */
/* Communications Register Bit Designations (AD7192_REG_COMM) */
#define AD7192_COMM_WEN BIT(7) /* Write Enable */
#define AD7192_COMM_WRITE 0 /* Write Operation */
#define AD7192_COMM_READ BIT(6) /* Read Operation */
#define AD7192_COMM_ADDR(x) (((x) & 0x7) << 3) /* Register Address */
#define AD7192_COMM_CREAD BIT(2) /* Continuous Read of Data Register */
/* Status Register Bit Designations (AD7192_REG_STAT) */
#define AD7192_STAT_RDY BIT(7) /* Ready */
#define AD7192_STAT_ERR BIT(6) /* Error (Overrange, Underrange) */
#define AD7192_STAT_NOREF BIT(5) /* Error no external reference */
#define AD7192_STAT_PARITY BIT(4) /* Parity */
#define AD7192_STAT_CH3 BIT(2) /* Channel 3 */
#define AD7192_STAT_CH2 BIT(1) /* Channel 2 */
#define AD7192_STAT_CH1 BIT(0) /* Channel 1 */
/* Mode Register Bit Designations (AD7192_REG_MODE) */
#define AD7192_MODE_SEL(x) (((x) & 0x7) << 21) /* Operation Mode Select */
#define AD7192_MODE_SEL_MASK (0x7 << 21) /* Operation Mode Select Mask */
#define AD7192_MODE_DAT_STA BIT(20) /* Status Register transmission */
#define AD7192_MODE_CLKSRC(x) (((x) & 0x3) << 18) /* Clock Source Select */
#define AD7192_MODE_SINC3 BIT(15) /* SINC3 Filter Select */
#define AD7192_MODE_ACX BIT(14) /* AC excitation enable(AD7195 only)*/
#define AD7192_MODE_ENPAR BIT(13) /* Parity Enable */
#define AD7192_MODE_CLKDIV BIT(12) /* Clock divide by 2 (AD7190/2 only)*/
#define AD7192_MODE_SCYCLE BIT(11) /* Single cycle conversion */
#define AD7192_MODE_REJ60 BIT(10) /* 50/60Hz notch filter */
#define AD7192_MODE_RATE(x) ((x) & 0x3FF) /* Filter Update Rate Select */
/* Mode Register: AD7192_MODE_SEL options */
#define AD7192_MODE_CONT 0 /* Continuous Conversion Mode */
#define AD7192_MODE_SINGLE 1 /* Single Conversion Mode */
#define AD7192_MODE_IDLE 2 /* Idle Mode */
#define AD7192_MODE_PWRDN 3 /* Power-Down Mode */
#define AD7192_MODE_CAL_INT_ZERO 4 /* Internal Zero-Scale Calibration */
#define AD7192_MODE_CAL_INT_FULL 5 /* Internal Full-Scale Calibration */
#define AD7192_MODE_CAL_SYS_ZERO 6 /* System Zero-Scale Calibration */
#define AD7192_MODE_CAL_SYS_FULL 7 /* System Full-Scale Calibration */
/* Mode Register: AD7192_MODE_CLKSRC options */
#define AD7192_CLK_EXT_MCLK1_2 0 /* External 4.92 MHz Clock connected
* from MCLK1 to MCLK2 */
#define AD7192_CLK_EXT_MCLK2 1 /* External Clock applied to MCLK2 */
#define AD7192_CLK_INT 2 /* Internal 4.92 MHz Clock not
* available at the MCLK2 pin */
#define AD7192_CLK_INT_CO 3 /* Internal 4.92 MHz Clock available
* at the MCLK2 pin */
/* Configuration Register Bit Designations (AD7192_REG_CONF) */
#define AD7192_CONF_CHOP BIT(23) /* CHOP enable */
#define AD7192_CONF_REFSEL BIT(20) /* REFIN1/REFIN2 Reference Select */
#define AD7192_CONF_CHAN(x) ((x) << 8) /* Channel select */
#define AD7192_CONF_CHAN_MASK (0x7FF << 8) /* Channel select mask */
#define AD7192_CONF_BURN BIT(7) /* Burnout current enable */
#define AD7192_CONF_REFDET BIT(6) /* Reference detect enable */
#define AD7192_CONF_BUF BIT(4) /* Buffered Mode Enable */
#define AD7192_CONF_UNIPOLAR BIT(3) /* Unipolar/Bipolar Enable */
#define AD7192_CONF_GAIN(x) ((x) & 0x7) /* Gain Select */
#define AD7192_CH_AIN1P_AIN2M BIT(0) /* AIN1(+) - AIN2(-) */
#define AD7192_CH_AIN3P_AIN4M BIT(1) /* AIN3(+) - AIN4(-) */
#define AD7192_CH_TEMP BIT(2) /* Temp Sensor */
#define AD7192_CH_AIN2P_AIN2M BIT(3) /* AIN2(+) - AIN2(-) */
#define AD7192_CH_AIN1 BIT(4) /* AIN1 - AINCOM */
#define AD7192_CH_AIN2 BIT(5) /* AIN2 - AINCOM */
#define AD7192_CH_AIN3 BIT(6) /* AIN3 - AINCOM */
#define AD7192_CH_AIN4 BIT(7) /* AIN4 - AINCOM */
#define AD7193_CH_AIN1P_AIN2M 0x000 /* AIN1(+) - AIN2(-) */
#define AD7193_CH_AIN3P_AIN4M 0x001 /* AIN3(+) - AIN4(-) */
#define AD7193_CH_AIN5P_AIN6M 0x002 /* AIN5(+) - AIN6(-) */
#define AD7193_CH_AIN7P_AIN8M 0x004 /* AIN7(+) - AIN8(-) */
#define AD7193_CH_TEMP 0x100 /* Temp senseor */
#define AD7193_CH_AIN2P_AIN2M 0x200 /* AIN2(+) - AIN2(-) */
#define AD7193_CH_AIN1 0x401 /* AIN1 - AINCOM */
#define AD7193_CH_AIN2 0x402 /* AIN2 - AINCOM */
#define AD7193_CH_AIN3 0x404 /* AIN3 - AINCOM */
#define AD7193_CH_AIN4 0x408 /* AIN4 - AINCOM */
#define AD7193_CH_AIN5 0x410 /* AIN5 - AINCOM */
#define AD7193_CH_AIN6 0x420 /* AIN6 - AINCOM */
#define AD7193_CH_AIN7 0x440 /* AIN7 - AINCOM */
#define AD7193_CH_AIN8 0x480 /* AIN7 - AINCOM */
#define AD7193_CH_AINCOM 0x600 /* AINCOM - AINCOM */
/* ID Register Bit Designations (AD7192_REG_ID) */
#define ID_AD7190 0x4
#define ID_AD7192 0x0
#define ID_AD7193 0x2
#define ID_AD7195 0x6
#define AD7192_ID_MASK 0x0F
/* GPOCON Register Bit Designations (AD7192_REG_GPOCON) */
#define AD7192_GPOCON_BPDSW BIT(6) /* Bridge power-down switch enable */
#define AD7192_GPOCON_GP32EN BIT(5) /* Digital Output P3 and P2 enable */
#define AD7192_GPOCON_GP10EN BIT(4) /* Digital Output P1 and P0 enable */
#define AD7192_GPOCON_P3DAT BIT(3) /* P3 state */
#define AD7192_GPOCON_P2DAT BIT(2) /* P2 state */
#define AD7192_GPOCON_P1DAT BIT(1) /* P1 state */
#define AD7192_GPOCON_P0DAT BIT(0) /* P0 state */
#define AD7192_INT_FREQ_MHZ 4915200
/* NOTE:
* The AD7190/2/5 features a dual use data out ready DOUT/RDY output.
* In order to avoid contentions on the SPI bus, it's therefore necessary
* to use spi bus locking.
*
* The DOUT/RDY output must also be wired to an interrupt capable GPIO.
*/
struct ad7192_state {
struct regulator *reg;
u16 int_vref_mv;
u32 mclk;
u32 f_order;
u32 mode;
u32 conf;
u32 scale_avail[8][2];
u8 gpocon;
u8 devid;
struct ad_sigma_delta sd;
};
static struct ad7192_state *ad_sigma_delta_to_ad7192(struct ad_sigma_delta *sd)
{
return container_of(sd, struct ad7192_state, sd);
}
static int ad7192_set_channel(struct ad_sigma_delta *sd, unsigned int channel)
{
struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd);
st->conf &= ~AD7192_CONF_CHAN_MASK;
st->conf |= AD7192_CONF_CHAN(channel);
return ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf);
}
static int ad7192_set_mode(struct ad_sigma_delta *sd,
enum ad_sigma_delta_mode mode)
{
struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd);
st->mode &= ~AD7192_MODE_SEL_MASK;
st->mode |= AD7192_MODE_SEL(mode);
return ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
}
static const struct ad_sigma_delta_info ad7192_sigma_delta_info = {
.set_channel = ad7192_set_channel,
.set_mode = ad7192_set_mode,
.has_registers = true,
.addr_shift = 3,
.read_mask = BIT(6),
};
static const struct ad_sd_calib_data ad7192_calib_arr[8] = {
{AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN1},
{AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN1},
{AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN2},
{AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN2},
{AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN3},
{AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN3},
{AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN4},
{AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN4}
};
static int ad7192_calibrate_all(struct ad7192_state *st)
{
return ad_sd_calibrate_all(&st->sd, ad7192_calib_arr,
ARRAY_SIZE(ad7192_calib_arr));
}
static int ad7192_setup(struct ad7192_state *st,
const struct ad7192_platform_data *pdata)
{
struct iio_dev *indio_dev = spi_get_drvdata(st->sd.spi);
unsigned long long scale_uv;
int i, ret, id;
u8 ones[6];
/* reset the serial interface */
memset(&ones, 0xFF, 6);
ret = spi_write(st->sd.spi, &ones, 6);
if (ret < 0)
goto out;
usleep_range(500, 1000); /* Wait for at least 500us */
/* write/read test for device presence */
ret = ad_sd_read_reg(&st->sd, AD7192_REG_ID, 1, &id);
if (ret)
goto out;
id &= AD7192_ID_MASK;
if (id != st->devid)
dev_warn(&st->sd.spi->dev, "device ID query failed (0x%X)\n",
id);
switch (pdata->clock_source_sel) {
case AD7192_CLK_EXT_MCLK1_2:
case AD7192_CLK_EXT_MCLK2:
st->mclk = AD7192_INT_FREQ_MHZ;
break;
case AD7192_CLK_INT:
case AD7192_CLK_INT_CO:
if (pdata->ext_clk_hz)
st->mclk = pdata->ext_clk_hz;
else
st->mclk = AD7192_INT_FREQ_MHZ;
break;
default:
ret = -EINVAL;
goto out;
}
st->mode = AD7192_MODE_SEL(AD7192_MODE_IDLE) |
AD7192_MODE_CLKSRC(pdata->clock_source_sel) |
AD7192_MODE_RATE(480);
st->conf = AD7192_CONF_GAIN(0);
if (pdata->rej60_en)
st->mode |= AD7192_MODE_REJ60;
if (pdata->sinc3_en)
st->mode |= AD7192_MODE_SINC3;
if (pdata->refin2_en && (st->devid != ID_AD7195))
st->conf |= AD7192_CONF_REFSEL;
if (pdata->chop_en) {
st->conf |= AD7192_CONF_CHOP;
if (pdata->sinc3_en)
st->f_order = 3; /* SINC 3rd order */
else
st->f_order = 4; /* SINC 4th order */
} else {
st->f_order = 1;
}
if (pdata->buf_en)
st->conf |= AD7192_CONF_BUF;
if (pdata->unipolar_en)
st->conf |= AD7192_CONF_UNIPOLAR;
if (pdata->burnout_curr_en)
st->conf |= AD7192_CONF_BURN;
ret = ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
if (ret)
goto out;
ret = ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf);
if (ret)
goto out;
ret = ad7192_calibrate_all(st);
if (ret)
goto out;
/* Populate available ADC input ranges */
for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) {
scale_uv = ((u64)st->int_vref_mv * 100000000)
>> (indio_dev->channels[0].scan_type.realbits -
((st->conf & AD7192_CONF_UNIPOLAR) ? 0 : 1));
scale_uv >>= i;
st->scale_avail[i][1] = do_div(scale_uv, 100000000) * 10;
st->scale_avail[i][0] = scale_uv;
}
return 0;
out:
dev_err(&st->sd.spi->dev, "setup failed\n");
return ret;
}
static ssize_t ad7192_read_frequency(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ad7192_state *st = iio_priv(indio_dev);
return sprintf(buf, "%d\n", st->mclk /
(st->f_order * 1024 * AD7192_MODE_RATE(st->mode)));
}
static ssize_t ad7192_write_frequency(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ad7192_state *st = iio_priv(indio_dev);
unsigned long lval;
int div, ret;
ret = kstrtoul(buf, 10, &lval);
if (ret)
return ret;
if (lval == 0)
return -EINVAL;
mutex_lock(&indio_dev->mlock);
if (iio_buffer_enabled(indio_dev)) {
mutex_unlock(&indio_dev->mlock);
return -EBUSY;
}
div = st->mclk / (lval * st->f_order * 1024);
if (div < 1 || div > 1023) {
ret = -EINVAL;
goto out;
}
st->mode &= ~AD7192_MODE_RATE(-1);
st->mode |= AD7192_MODE_RATE(div);
ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
out:
mutex_unlock(&indio_dev->mlock);
return ret ? ret : len;
}
static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
ad7192_read_frequency,
ad7192_write_frequency);
static ssize_t
ad7192_show_scale_available(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ad7192_state *st = iio_priv(indio_dev);
int i, len = 0;
for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++)
len += sprintf(buf + len, "%d.%09u ", st->scale_avail[i][0],
st->scale_avail[i][1]);
len += sprintf(buf + len, "\n");
return len;
}
static IIO_DEVICE_ATTR_NAMED(in_v_m_v_scale_available,
in_voltage-voltage_scale_available,
S_IRUGO, ad7192_show_scale_available, NULL, 0);
static IIO_DEVICE_ATTR(in_voltage_scale_available, S_IRUGO,
ad7192_show_scale_available, NULL, 0);
static ssize_t ad7192_show_ac_excitation(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ad7192_state *st = iio_priv(indio_dev);
return sprintf(buf, "%d\n", !!(st->mode & AD7192_MODE_ACX));
}
static ssize_t ad7192_show_bridge_switch(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ad7192_state *st = iio_priv(indio_dev);
return sprintf(buf, "%d\n", !!(st->gpocon & AD7192_GPOCON_BPDSW));
}
static ssize_t ad7192_set(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ad7192_state *st = iio_priv(indio_dev);
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
int ret;
bool val;
ret = strtobool(buf, &val);
if (ret < 0)
return ret;
mutex_lock(&indio_dev->mlock);
if (iio_buffer_enabled(indio_dev)) {
mutex_unlock(&indio_dev->mlock);
return -EBUSY;
}
switch ((u32)this_attr->address) {
case AD7192_REG_GPOCON:
if (val)
st->gpocon |= AD7192_GPOCON_BPDSW;
else
st->gpocon &= ~AD7192_GPOCON_BPDSW;
ad_sd_write_reg(&st->sd, AD7192_REG_GPOCON, 1, st->gpocon);
break;
case AD7192_REG_MODE:
if (val)
st->mode |= AD7192_MODE_ACX;
else
st->mode &= ~AD7192_MODE_ACX;
ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
break;
default:
ret = -EINVAL;
}
mutex_unlock(&indio_dev->mlock);
return ret ? ret : len;
}
static IIO_DEVICE_ATTR(bridge_switch_en, S_IRUGO | S_IWUSR,
ad7192_show_bridge_switch, ad7192_set,
AD7192_REG_GPOCON);
static IIO_DEVICE_ATTR(ac_excitation_en, S_IRUGO | S_IWUSR,
ad7192_show_ac_excitation, ad7192_set,
AD7192_REG_MODE);
static struct attribute *ad7192_attributes[] = {
&iio_dev_attr_sampling_frequency.dev_attr.attr,
&iio_dev_attr_in_v_m_v_scale_available.dev_attr.attr,
&iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
&iio_dev_attr_bridge_switch_en.dev_attr.attr,
&iio_dev_attr_ac_excitation_en.dev_attr.attr,
NULL
};
static const struct attribute_group ad7192_attribute_group = {
.attrs = ad7192_attributes,
};
static struct attribute *ad7195_attributes[] = {
&iio_dev_attr_sampling_frequency.dev_attr.attr,
&iio_dev_attr_in_v_m_v_scale_available.dev_attr.attr,
&iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
&iio_dev_attr_bridge_switch_en.dev_attr.attr,
NULL
};
static const struct attribute_group ad7195_attribute_group = {
.attrs = ad7195_attributes,
};
static unsigned int ad7192_get_temp_scale(bool unipolar)
{
return unipolar ? 2815 * 2 : 2815;
}
static int ad7192_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val,
int *val2,
long m)
{
struct ad7192_state *st = iio_priv(indio_dev);
bool unipolar = !!(st->conf & AD7192_CONF_UNIPOLAR);
switch (m) {
case IIO_CHAN_INFO_RAW:
return ad_sigma_delta_single_conversion(indio_dev, chan, val);
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_VOLTAGE:
mutex_lock(&indio_dev->mlock);
*val = st->scale_avail[AD7192_CONF_GAIN(st->conf)][0];
*val2 = st->scale_avail[AD7192_CONF_GAIN(st->conf)][1];
mutex_unlock(&indio_dev->mlock);
return IIO_VAL_INT_PLUS_NANO;
case IIO_TEMP:
*val = 0;
*val2 = 1000000000 / ad7192_get_temp_scale(unipolar);
return IIO_VAL_INT_PLUS_NANO;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_OFFSET:
if (!unipolar)
*val = -(1 << (chan->scan_type.realbits - 1));
else
*val = 0;
/* Kelvin to Celsius */
if (chan->type == IIO_TEMP)
*val -= 273 * ad7192_get_temp_scale(unipolar);
return IIO_VAL_INT;
}
return -EINVAL;
}
static int ad7192_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val,
int val2,
long mask)
{
struct ad7192_state *st = iio_priv(indio_dev);
int ret, i;
unsigned int tmp;
mutex_lock(&indio_dev->mlock);
if (iio_buffer_enabled(indio_dev)) {
mutex_unlock(&indio_dev->mlock);
return -EBUSY;
}
switch (mask) {
case IIO_CHAN_INFO_SCALE:
ret = -EINVAL;
for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++)
if (val2 == st->scale_avail[i][1]) {
ret = 0;
tmp = st->conf;
st->conf &= ~AD7192_CONF_GAIN(-1);
st->conf |= AD7192_CONF_GAIN(i);
if (tmp == st->conf)
break;
ad_sd_write_reg(&st->sd, AD7192_REG_CONF,
3, st->conf);
ad7192_calibrate_all(st);
break;
}
break;
default:
ret = -EINVAL;
}
mutex_unlock(&indio_dev->mlock);
return ret;
}
static int ad7192_write_raw_get_fmt(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
long mask)
{
return IIO_VAL_INT_PLUS_NANO;
}
static const struct iio_info ad7192_info = {
.read_raw = &ad7192_read_raw,
.write_raw = &ad7192_write_raw,
.write_raw_get_fmt = &ad7192_write_raw_get_fmt,
.attrs = &ad7192_attribute_group,
.validate_trigger = ad_sd_validate_trigger,
.driver_module = THIS_MODULE,
};
static const struct iio_info ad7195_info = {
.read_raw = &ad7192_read_raw,
.write_raw = &ad7192_write_raw,
.write_raw_get_fmt = &ad7192_write_raw_get_fmt,
.attrs = &ad7195_attribute_group,
.validate_trigger = ad_sd_validate_trigger,
.driver_module = THIS_MODULE,
};
static const struct iio_chan_spec ad7192_channels[] = {
AD_SD_DIFF_CHANNEL(0, 1, 2, AD7192_CH_AIN1P_AIN2M, 24, 32, 0),
AD_SD_DIFF_CHANNEL(1, 3, 4, AD7192_CH_AIN3P_AIN4M, 24, 32, 0),
AD_SD_TEMP_CHANNEL(2, AD7192_CH_TEMP, 24, 32, 0),
AD_SD_SHORTED_CHANNEL(3, 2, AD7192_CH_AIN2P_AIN2M, 24, 32, 0),
AD_SD_CHANNEL(4, 1, AD7192_CH_AIN1, 24, 32, 0),
AD_SD_CHANNEL(5, 2, AD7192_CH_AIN2, 24, 32, 0),
AD_SD_CHANNEL(6, 3, AD7192_CH_AIN3, 24, 32, 0),
AD_SD_CHANNEL(7, 4, AD7192_CH_AIN4, 24, 32, 0),
IIO_CHAN_SOFT_TIMESTAMP(8),
};
static const struct iio_chan_spec ad7193_channels[] = {
AD_SD_DIFF_CHANNEL(0, 1, 2, AD7193_CH_AIN1P_AIN2M, 24, 32, 0),
AD_SD_DIFF_CHANNEL(1, 3, 4, AD7193_CH_AIN3P_AIN4M, 24, 32, 0),
AD_SD_DIFF_CHANNEL(2, 5, 6, AD7193_CH_AIN5P_AIN6M, 24, 32, 0),
AD_SD_DIFF_CHANNEL(3, 7, 8, AD7193_CH_AIN7P_AIN8M, 24, 32, 0),
AD_SD_TEMP_CHANNEL(4, AD7193_CH_TEMP, 24, 32, 0),
AD_SD_SHORTED_CHANNEL(5, 2, AD7193_CH_AIN2P_AIN2M, 24, 32, 0),
AD_SD_CHANNEL(6, 1, AD7193_CH_AIN1, 24, 32, 0),
AD_SD_CHANNEL(7, 2, AD7193_CH_AIN2, 24, 32, 0),
AD_SD_CHANNEL(8, 3, AD7193_CH_AIN3, 24, 32, 0),
AD_SD_CHANNEL(9, 4, AD7193_CH_AIN4, 24, 32, 0),
AD_SD_CHANNEL(10, 5, AD7193_CH_AIN5, 24, 32, 0),
AD_SD_CHANNEL(11, 6, AD7193_CH_AIN6, 24, 32, 0),
AD_SD_CHANNEL(12, 7, AD7193_CH_AIN7, 24, 32, 0),
AD_SD_CHANNEL(13, 8, AD7193_CH_AIN8, 24, 32, 0),
IIO_CHAN_SOFT_TIMESTAMP(14),
};
static int ad7192_probe(struct spi_device *spi)
{
const struct ad7192_platform_data *pdata = dev_get_platdata(&spi->dev);
struct ad7192_state *st;
struct iio_dev *indio_dev;
int ret, voltage_uv = 0;
if (!pdata) {
dev_err(&spi->dev, "no platform data?\n");
return -ENODEV;
}
if (!spi->irq) {
dev_err(&spi->dev, "no IRQ?\n");
return -ENODEV;
}
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
if (!indio_dev)
return -ENOMEM;
st = iio_priv(indio_dev);
st->reg = devm_regulator_get(&spi->dev, "vcc");
if (!IS_ERR(st->reg)) {
ret = regulator_enable(st->reg);
if (ret)
return ret;
voltage_uv = regulator_get_voltage(st->reg);
}
if (pdata->vref_mv)
st->int_vref_mv = pdata->vref_mv;
else if (voltage_uv)
st->int_vref_mv = voltage_uv / 1000;
else
dev_warn(&spi->dev, "reference voltage undefined\n");
spi_set_drvdata(spi, indio_dev);
st->devid = spi_get_device_id(spi)->driver_data;
indio_dev->dev.parent = &spi->dev;
indio_dev->name = spi_get_device_id(spi)->name;
indio_dev->modes = INDIO_DIRECT_MODE;
switch (st->devid) {
case ID_AD7193:
indio_dev->channels = ad7193_channels;
indio_dev->num_channels = ARRAY_SIZE(ad7193_channels);
break;
default:
indio_dev->channels = ad7192_channels;
indio_dev->num_channels = ARRAY_SIZE(ad7192_channels);
break;
}
if (st->devid == ID_AD7195)
indio_dev->info = &ad7195_info;
else
indio_dev->info = &ad7192_info;
ad_sd_init(&st->sd, indio_dev, spi, &ad7192_sigma_delta_info);
ret = ad_sd_setup_buffer_and_trigger(indio_dev);
if (ret)
goto error_disable_reg;
ret = ad7192_setup(st, pdata);
if (ret)
goto error_remove_trigger;
ret = iio_device_register(indio_dev);
if (ret < 0)
goto error_remove_trigger;
return 0;
error_remove_trigger:
ad_sd_cleanup_buffer_and_trigger(indio_dev);
error_disable_reg:
if (!IS_ERR(st->reg))
regulator_disable(st->reg);
return ret;
}
static int ad7192_remove(struct spi_device *spi)
{
struct iio_dev *indio_dev = spi_get_drvdata(spi);
struct ad7192_state *st = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
ad_sd_cleanup_buffer_and_trigger(indio_dev);
if (!IS_ERR(st->reg))
regulator_disable(st->reg);
return 0;
}
static const struct spi_device_id ad7192_id[] = {
{"ad7190", ID_AD7190},
{"ad7192", ID_AD7192},
{"ad7193", ID_AD7193},
{"ad7195", ID_AD7195},
{}
};
MODULE_DEVICE_TABLE(spi, ad7192_id);
static struct spi_driver ad7192_driver = {
.driver = {
.name = "ad7192",
},
.probe = ad7192_probe,
.remove = ad7192_remove,
.id_table = ad7192_id,
};
module_spi_driver(ad7192_driver);
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Analog Devices AD7190, AD7192, AD7193, AD7195 ADC");
MODULE_LICENSE("GPL v2");
