Skip to content

Commit

Permalink
iio: adc: ti-ads1015: add support for ADS1115 part
Browse files Browse the repository at this point in the history 
TI ADS1115 is a 16-bit resolution ADC that is register map
compatible with the ADS1015 device.

Signed-off-by: Matt Ranostay <matt.ranostay@intel.com>
Acked-by: Daniel Baluta <daniel.baluta@intel.com>
Acked-by: Crt Mori <cmo@melexis.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
  • Loading branch information
Matt Ranostay authored and Jonathan Cameron committed May 21, 2016
1 parent 9d75db3 commit ba35f11
Showing 1 changed file with 109 additions and 15 deletions.
124 changes: 109 additions & 15 deletions drivers/iio/adc/ti-ads1015.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -55,6 +55,11 @@
#define ADS1015_DEFAULT_DATA_RATE 4
#define ADS1015_DEFAULT_CHAN 0

enum {
ADS1015,
ADS1115,
};

enum ads1015_channels {
ADS1015_AIN0_AIN1 = 0,
ADS1015_AIN0_AIN3,
Expand All @@ -71,6 +76,10 @@ static const unsigned int ads1015_data_rate[] = {
128, 250, 490, 920, 1600, 2400, 3300, 3300
};

static const unsigned int ads1115_data_rate[] = {
8, 16, 32, 64, 128, 250, 475, 860
};

static const struct {
int scale;
int uscale;
Expand Down Expand Up @@ -123,6 +132,42 @@ static const struct {
}, \
}

#define ADS1115_V_CHAN(_chan, _addr) { \
.type = IIO_VOLTAGE, \
.indexed = 1, \
.address = _addr, \
.channel = _chan, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_SCALE) | \
BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.scan_index = _addr, \
.scan_type = { \
.sign = 's', \
.realbits = 16, \
.storagebits = 16, \
.endianness = IIO_CPU, \
}, \
}

#define ADS1115_V_DIFF_CHAN(_chan, _chan2, _addr) { \
.type = IIO_VOLTAGE, \
.differential = 1, \
.indexed = 1, \
.address = _addr, \
.channel = _chan, \
.channel2 = _chan2, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_SCALE) | \
BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.scan_index = _addr, \
.scan_type = { \
.sign = 's', \
.realbits = 16, \
.storagebits = 16, \
.endianness = IIO_CPU, \
}, \
}

struct ads1015_data {
struct regmap *regmap;
/*
Expand All @@ -131,6 +176,8 @@ struct ads1015_data {
*/
struct mutex lock;
struct ads1015_channel_data channel_data[ADS1015_CHANNELS];

unsigned int *data_rate;
};

static bool ads1015_is_writeable_reg(struct device *dev, unsigned int reg)
Expand All @@ -157,6 +204,18 @@ static const struct iio_chan_spec ads1015_channels[] = {
IIO_CHAN_SOFT_TIMESTAMP(ADS1015_TIMESTAMP),
};

static const struct iio_chan_spec ads1115_channels[] = {
ADS1115_V_DIFF_CHAN(0, 1, ADS1015_AIN0_AIN1),
ADS1115_V_DIFF_CHAN(0, 3, ADS1015_AIN0_AIN3),
ADS1115_V_DIFF_CHAN(1, 3, ADS1015_AIN1_AIN3),
ADS1115_V_DIFF_CHAN(2, 3, ADS1015_AIN2_AIN3),
ADS1115_V_CHAN(0, ADS1015_AIN0),
ADS1115_V_CHAN(1, ADS1015_AIN1),
ADS1115_V_CHAN(2, ADS1015_AIN2),
ADS1115_V_CHAN(3, ADS1015_AIN3),
IIO_CHAN_SOFT_TIMESTAMP(ADS1015_TIMESTAMP),
};

static int ads1015_set_power_state(struct ads1015_data *data, bool on)
{
int ret;
Expand Down Expand Up @@ -196,7 +255,7 @@ int ads1015_get_adc_result(struct ads1015_data *data, int chan, int *val)
return ret;

if (change) {
conv_time = DIV_ROUND_UP(USEC_PER_SEC, ads1015_data_rate[dr]);
conv_time = DIV_ROUND_UP(USEC_PER_SEC, data->data_rate[dr]);
usleep_range(conv_time, conv_time + 1);
}

Expand Down Expand Up @@ -263,7 +322,7 @@ static int ads1015_set_data_rate(struct ads1015_data *data, int chan, int rate)
int i, ret, rindex = -1;

for (i = 0; i < ARRAY_SIZE(ads1015_data_rate); i++)
if (ads1015_data_rate[i] == rate) {
if (data->data_rate[i] == rate) {
rindex = i;
break;
}
Expand Down Expand Up @@ -291,7 +350,9 @@ static int ads1015_read_raw(struct iio_dev *indio_dev,
mutex_lock(&indio_dev->mlock);
mutex_lock(&data->lock);
switch (mask) {
case IIO_CHAN_INFO_RAW:
case IIO_CHAN_INFO_RAW: {
int shift = chan->scan_type.shift;

if (iio_buffer_enabled(indio_dev)) {
ret = -EBUSY;
break;
Expand All @@ -307,15 +368,15 @@ static int ads1015_read_raw(struct iio_dev *indio_dev,
break;
}

/* 12 bit res, D0 is bit 4 in conversion register */
*val = sign_extend32(*val >> 4, 11);
*val = sign_extend32(*val >> shift, 15 - shift);

ret = ads1015_set_power_state(data, false);
if (ret < 0)
break;

ret = IIO_VAL_INT;
break;
}
case IIO_CHAN_INFO_SCALE:
idx = data->channel_data[chan->address].pga;
*val = ads1015_scale[idx].scale;
Expand All @@ -324,7 +385,7 @@ static int ads1015_read_raw(struct iio_dev *indio_dev,
break;
case IIO_CHAN_INFO_SAMP_FREQ:
idx = data->channel_data[chan->address].data_rate;
*val = ads1015_data_rate[idx];
*val = data->data_rate[idx];
ret = IIO_VAL_INT;
break;
default:
Expand Down Expand Up @@ -380,24 +441,44 @@ static const struct iio_buffer_setup_ops ads1015_buffer_setup_ops = {
};

static IIO_CONST_ATTR(scale_available, "3 2 1 0.5 0.25 0.125");
static IIO_CONST_ATTR(sampling_frequency_available,
"128 250 490 920 1600 2400 3300");

static IIO_CONST_ATTR_NAMED(ads1015_sampling_frequency_available,
sampling_frequency_available, "128 250 490 920 1600 2400 3300");
static IIO_CONST_ATTR_NAMED(ads1115_sampling_frequency_available,
sampling_frequency_available, "8 16 32 64 128 250 475 860");

static struct attribute *ads1015_attributes[] = {
&iio_const_attr_scale_available.dev_attr.attr,
&iio_const_attr_sampling_frequency_available.dev_attr.attr,
&iio_const_attr_ads1015_sampling_frequency_available.dev_attr.attr,
NULL,
};

static const struct attribute_group ads1015_attribute_group = {
.attrs = ads1015_attributes,
};

static const struct iio_info ads1015_info = {
static struct attribute *ads1115_attributes[] = {
&iio_const_attr_scale_available.dev_attr.attr,
&iio_const_attr_ads1115_sampling_frequency_available.dev_attr.attr,
NULL,
};

static const struct attribute_group ads1115_attribute_group = {
.attrs = ads1115_attributes,
};

static struct iio_info ads1015_info = {
.driver_module = THIS_MODULE,
.read_raw = ads1015_read_raw,
.write_raw = ads1015_write_raw,
.attrs = &ads1015_attribute_group,
};

static struct iio_info ads1115_info = {
.driver_module = THIS_MODULE,
.read_raw = ads1015_read_raw,
.write_raw = ads1015_write_raw,
.attrs = &ads1015_attribute_group,
.attrs = &ads1115_attribute_group,
};

#ifdef CONFIG_OF
Expand Down Expand Up @@ -500,12 +581,24 @@ static int ads1015_probe(struct i2c_client *client,
mutex_init(&data->lock);

indio_dev->dev.parent = &client->dev;
indio_dev->info = &ads1015_info;
indio_dev->name = ADS1015_DRV_NAME;
indio_dev->channels = ads1015_channels;
indio_dev->num_channels = ARRAY_SIZE(ads1015_channels);
indio_dev->modes = INDIO_DIRECT_MODE;

switch (id->driver_data) {
case ADS1015:
indio_dev->channels = ads1015_channels;
indio_dev->num_channels = ARRAY_SIZE(ads1015_channels);
indio_dev->info = &ads1015_info;
data->data_rate = (unsigned int *) &ads1015_data_rate;
break;
case ADS1115:
indio_dev->channels = ads1115_channels;
indio_dev->num_channels = ARRAY_SIZE(ads1115_channels);
indio_dev->info = &ads1115_info;
data->data_rate = (unsigned int *) &ads1115_data_rate;
break;
}

/* we need to keep this ABI the same as used by hwmon ADS1015 driver */
ads1015_get_channels_config(client);

Expand Down Expand Up @@ -590,7 +683,8 @@ static const struct dev_pm_ops ads1015_pm_ops = {
};

static const struct i2c_device_id ads1015_id[] = {
{"ads1015", 0},
{"ads1015", ADS1015},
{"ads1115", ADS1115},
{}
};
MODULE_DEVICE_TABLE(i2c, ads1015_id);
Expand Down

0 comments on commit ba35f11

Please sign in to comment.