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iio:ad7793: Add support for the ad7798 and ad7799
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The ad7798 and ad7799 are similar to the ad7792 and ad7793 but are missing some
features like the temperature sensor, being able to use an external clocksource
and a few other things. This patch adds a new 'flags' fields to the chip_info
struct which allows to specify which features a certain chip variant supports.
The setup code will then ignore any platform data fields which are related to
non supported features.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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Lars-Peter Clausen authored and Jonathan Cameron committed Nov 30, 2012
1 parent f87f1a2 commit 2edb769
Showing 1 changed file with 102 additions and 14 deletions.
116 changes: 102 additions & 14 deletions drivers/iio/adc/ad7793.c
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Original file line number Diff line number Diff line change
Expand Up @@ -106,6 +106,8 @@
#define AD7793_ID 0xB
#define AD7794_ID 0xF
#define AD7795_ID 0xF
#define AD7798_ID 0x8
#define AD7799_ID 0x9
#define AD7793_ID_MASK 0xF

/* IO (Excitation Current Sources) Register Bit Designations (AD7793_REG_IO) */
Expand All @@ -130,10 +132,16 @@
* The DOUT/RDY output must also be wired to an interrupt capable GPIO.
*/

#define AD7793_FLAG_HAS_CLKSEL BIT(0)
#define AD7793_FLAG_HAS_REFSEL BIT(1)
#define AD7793_FLAG_HAS_VBIAS BIT(2)
#define AD7793_HAS_EXITATION_CURRENT BIT(3)

struct ad7793_chip_info {
unsigned int id;
const struct iio_chan_spec *channels;
unsigned int num_channels;
unsigned int flags;
};

struct ad7793_state {
Expand All @@ -154,6 +162,8 @@ enum ad7793_supported_device_ids {
ID_AD7793,
ID_AD7794,
ID_AD7795,
ID_AD7798,
ID_AD7799,
};

static struct ad7793_state *ad_sigma_delta_to_ad7793(struct ad_sigma_delta *sd)
Expand Down Expand Up @@ -205,6 +215,34 @@ static int ad7793_calibrate_all(struct ad7793_state *st)
ARRAY_SIZE(ad7793_calib_arr));
}

static int ad7793_check_platform_data(struct ad7793_state *st,
const struct ad7793_platform_data *pdata)
{
if ((pdata->current_source_direction == AD7793_IEXEC1_IEXEC2_IOUT1 ||
pdata->current_source_direction == AD7793_IEXEC1_IEXEC2_IOUT2) &&
((pdata->exitation_current != AD7793_IX_10uA) &&
(pdata->exitation_current != AD7793_IX_210uA)))
return -EINVAL;

if (!(st->chip_info->flags & AD7793_FLAG_HAS_CLKSEL) &&
pdata->clock_src != AD7793_CLK_SRC_INT)
return -EINVAL;

if (!(st->chip_info->flags & AD7793_FLAG_HAS_REFSEL) &&
pdata->refsel != AD7793_REFSEL_REFIN1)
return -EINVAL;

if (!(st->chip_info->flags & AD7793_FLAG_HAS_VBIAS) &&
pdata->bias_voltage != AD7793_BIAS_VOLTAGE_DISABLED)
return -EINVAL;

if (!(st->chip_info->flags & AD7793_HAS_EXITATION_CURRENT) &&
pdata->exitation_current != AD7793_IX_DISABLED)
return -EINVAL;

return 0;
}

static int ad7793_setup(struct iio_dev *indio_dev,
const struct ad7793_platform_data *pdata,
unsigned int vref_mv)
Expand All @@ -214,11 +252,9 @@ static int ad7793_setup(struct iio_dev *indio_dev,
unsigned long long scale_uv;
u32 id;

if ((pdata->current_source_direction == AD7793_IEXEC1_IEXEC2_IOUT1 ||
pdata->current_source_direction == AD7793_IEXEC1_IEXEC2_IOUT2) &&
((pdata->exitation_current != AD7793_IX_10uA) &&
(pdata->exitation_current != AD7793_IX_210uA)))
return -EINVAL;
ret = ad7793_check_platform_data(st, pdata);
if (ret)
return ret;

/* reset the serial interface */
ret = spi_write(st->sd.spi, (u8 *)&ret, sizeof(ret));
Expand All @@ -239,12 +275,18 @@ static int ad7793_setup(struct iio_dev *indio_dev,
}

st->mode = AD7793_MODE_RATE(1);
st->mode |= AD7793_MODE_CLKSRC(pdata->clock_src);
st->conf = AD7793_CONF_REFSEL(pdata->refsel);
st->conf |= AD7793_CONF_VBIAS(pdata->bias_voltage);
st->conf = 0;

if (st->chip_info->flags & AD7793_FLAG_HAS_CLKSEL)
st->mode |= AD7793_MODE_CLKSRC(pdata->clock_src);
if (st->chip_info->flags & AD7793_FLAG_HAS_REFSEL)
st->conf |= AD7793_CONF_REFSEL(pdata->refsel);
if (st->chip_info->flags & AD7793_FLAG_HAS_VBIAS)
st->conf |= AD7793_CONF_VBIAS(pdata->bias_voltage);
if (pdata->buffered)
st->conf |= AD7793_CONF_BUF;
if (pdata->boost_enable)
if (pdata->boost_enable &&
(st->chip_info->flags & AD7793_FLAG_HAS_VBIAS))
st->conf |= AD7793_CONF_BOOST;
if (pdata->burnout_current)
st->conf |= AD7793_CONF_BO_EN;
Expand All @@ -259,11 +301,13 @@ static int ad7793_setup(struct iio_dev *indio_dev,
if (ret)
goto out;

ret = ad_sd_write_reg(&st->sd, AD7793_REG_IO, 1,
pdata->exitation_current |
(pdata->current_source_direction << 2));
if (ret)
goto out;
if (st->chip_info->flags & AD7793_HAS_EXITATION_CURRENT) {
ret = ad_sd_write_reg(&st->sd, AD7793_REG_IO, 1,
pdata->exitation_current |
(pdata->current_source_direction << 2));
if (ret)
goto out;
}

ret = ad7793_calibrate_all(st);
if (ret)
Expand Down Expand Up @@ -525,37 +569,79 @@ const struct iio_chan_spec _name##_channels[] = { \
IIO_CHAN_SOFT_TIMESTAMP(9), \
}

#define DECLARE_AD7799_CHANNELS(_name, _b, _sb) \
const struct iio_chan_spec _name##_channels[] = { \
AD_SD_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \
AD_SD_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), 0), \
AD_SD_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), 0), \
AD_SD_SHORTED_CHANNEL(3, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), 0), \
AD_SD_SUPPLY_CHANNEL(4, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \
IIO_CHAN_SOFT_TIMESTAMP(5), \
}

static DECLARE_AD7793_CHANNELS(ad7785, 20, 32, 4);
static DECLARE_AD7793_CHANNELS(ad7792, 16, 32, 0);
static DECLARE_AD7793_CHANNELS(ad7793, 24, 32, 0);
static DECLARE_AD7795_CHANNELS(ad7794, 16, 32);
static DECLARE_AD7795_CHANNELS(ad7795, 24, 32);
static DECLARE_AD7799_CHANNELS(ad7798, 16, 16);
static DECLARE_AD7799_CHANNELS(ad7799, 24, 32);

static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
[ID_AD7785] = {
.id = AD7785_ID,
.channels = ad7785_channels,
.num_channels = ARRAY_SIZE(ad7785_channels),
.flags = AD7793_FLAG_HAS_CLKSEL |
AD7793_FLAG_HAS_REFSEL |
AD7793_FLAG_HAS_VBIAS |
AD7793_HAS_EXITATION_CURRENT,
},
[ID_AD7792] = {
.id = AD7792_ID,
.channels = ad7792_channels,
.num_channels = ARRAY_SIZE(ad7792_channels),
.flags = AD7793_FLAG_HAS_CLKSEL |
AD7793_FLAG_HAS_REFSEL |
AD7793_FLAG_HAS_VBIAS |
AD7793_HAS_EXITATION_CURRENT,
},
[ID_AD7793] = {
.id = AD7793_ID,
.channels = ad7793_channels,
.num_channels = ARRAY_SIZE(ad7793_channels),
.flags = AD7793_FLAG_HAS_CLKSEL |
AD7793_FLAG_HAS_REFSEL |
AD7793_FLAG_HAS_VBIAS |
AD7793_HAS_EXITATION_CURRENT,
},
[ID_AD7794] = {
.id = AD7794_ID,
.channels = ad7794_channels,
.num_channels = ARRAY_SIZE(ad7794_channels),
.flags = AD7793_FLAG_HAS_CLKSEL |
AD7793_FLAG_HAS_REFSEL |
AD7793_FLAG_HAS_VBIAS |
AD7793_HAS_EXITATION_CURRENT,
},
[ID_AD7795] = {
.id = AD7795_ID,
.channels = ad7795_channels,
.num_channels = ARRAY_SIZE(ad7795_channels),
.flags = AD7793_FLAG_HAS_CLKSEL |
AD7793_FLAG_HAS_REFSEL |
AD7793_FLAG_HAS_VBIAS |
AD7793_HAS_EXITATION_CURRENT,
},
[ID_AD7798] = {
.id = AD7798_ID,
.channels = ad7798_channels,
.num_channels = ARRAY_SIZE(ad7798_channels),
},
[ID_AD7799] = {
.id = AD7799_ID,
.channels = ad7799_channels,
.num_channels = ARRAY_SIZE(ad7799_channels),
},
};

Expand Down Expand Up @@ -671,6 +757,8 @@ static const struct spi_device_id ad7793_id[] = {
{"ad7793", ID_AD7793},
{"ad7794", ID_AD7794},
{"ad7795", ID_AD7795},
{"ad7798", ID_AD7798},
{"ad7799", ID_AD7799},
{}
};
MODULE_DEVICE_TABLE(spi, ad7793_id);
Expand Down

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