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iio: adc: ti-ads1015: add support for ADS1115 part
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>
This commit is contained in:
Matt Ranostay
Jonathan Cameron
parent
9d75db36df
commit
ba35f111aa
@ -55,6 +55,11 @@
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#define ADS1015_DEFAULT_DATA_RATE 4
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#define ADS1015_DEFAULT_CHAN 0
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enum {
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ADS1015,
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ADS1115,
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};
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enum ads1015_channels {
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ADS1015_AIN0_AIN1 = 0,
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ADS1015_AIN0_AIN3,
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@ -71,6 +76,10 @@ static const unsigned int ads1015_data_rate[] = {
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128, 250, 490, 920, 1600, 2400, 3300, 3300
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};
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static const unsigned int ads1115_data_rate[] = {
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8, 16, 32, 64, 128, 250, 475, 860
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};
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static const struct {
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int scale;
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int uscale;
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@ -123,6 +132,42 @@ static const struct {
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}, \
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}
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#define ADS1115_V_CHAN(_chan, _addr) { \
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.type = IIO_VOLTAGE, \
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.indexed = 1, \
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.address = _addr, \
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.channel = _chan, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
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BIT(IIO_CHAN_INFO_SCALE) | \
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BIT(IIO_CHAN_INFO_SAMP_FREQ), \
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.scan_index = _addr, \
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.scan_type = { \
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.sign = 's', \
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.realbits = 16, \
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.storagebits = 16, \
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.endianness = IIO_CPU, \
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}, \
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}
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#define ADS1115_V_DIFF_CHAN(_chan, _chan2, _addr) { \
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.type = IIO_VOLTAGE, \
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.differential = 1, \
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.indexed = 1, \
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.address = _addr, \
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.channel = _chan, \
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.channel2 = _chan2, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
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BIT(IIO_CHAN_INFO_SCALE) | \
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BIT(IIO_CHAN_INFO_SAMP_FREQ), \
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.scan_index = _addr, \
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.scan_type = { \
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.sign = 's', \
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.realbits = 16, \
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.storagebits = 16, \
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.endianness = IIO_CPU, \
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}, \
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}
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struct ads1015_data {
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struct regmap *regmap;
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/*
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@ -131,6 +176,8 @@ struct ads1015_data {
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*/
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struct mutex lock;
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struct ads1015_channel_data channel_data[ADS1015_CHANNELS];
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unsigned int *data_rate;
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};
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static bool ads1015_is_writeable_reg(struct device *dev, unsigned int reg)
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@ -157,6 +204,18 @@ static const struct iio_chan_spec ads1015_channels[] = {
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IIO_CHAN_SOFT_TIMESTAMP(ADS1015_TIMESTAMP),
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};
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static const struct iio_chan_spec ads1115_channels[] = {
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ADS1115_V_DIFF_CHAN(0, 1, ADS1015_AIN0_AIN1),
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ADS1115_V_DIFF_CHAN(0, 3, ADS1015_AIN0_AIN3),
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ADS1115_V_DIFF_CHAN(1, 3, ADS1015_AIN1_AIN3),
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ADS1115_V_DIFF_CHAN(2, 3, ADS1015_AIN2_AIN3),
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ADS1115_V_CHAN(0, ADS1015_AIN0),
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ADS1115_V_CHAN(1, ADS1015_AIN1),
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ADS1115_V_CHAN(2, ADS1015_AIN2),
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ADS1115_V_CHAN(3, ADS1015_AIN3),
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IIO_CHAN_SOFT_TIMESTAMP(ADS1015_TIMESTAMP),
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};
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static int ads1015_set_power_state(struct ads1015_data *data, bool on)
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{
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int ret;
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@ -196,7 +255,7 @@ int ads1015_get_adc_result(struct ads1015_data *data, int chan, int *val)
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return ret;
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if (change) {
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conv_time = DIV_ROUND_UP(USEC_PER_SEC, ads1015_data_rate[dr]);
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conv_time = DIV_ROUND_UP(USEC_PER_SEC, data->data_rate[dr]);
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usleep_range(conv_time, conv_time + 1);
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}
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@ -263,7 +322,7 @@ static int ads1015_set_data_rate(struct ads1015_data *data, int chan, int rate)
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int i, ret, rindex = -1;
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for (i = 0; i < ARRAY_SIZE(ads1015_data_rate); i++)
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if (ads1015_data_rate[i] == rate) {
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if (data->data_rate[i] == rate) {
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rindex = i;
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break;
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}
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@ -291,7 +350,9 @@ static int ads1015_read_raw(struct iio_dev *indio_dev,
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mutex_lock(&indio_dev->mlock);
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mutex_lock(&data->lock);
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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case IIO_CHAN_INFO_RAW: {
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int shift = chan->scan_type.shift;
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if (iio_buffer_enabled(indio_dev)) {
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ret = -EBUSY;
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break;
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@ -307,8 +368,7 @@ static int ads1015_read_raw(struct iio_dev *indio_dev,
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break;
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}
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/* 12 bit res, D0 is bit 4 in conversion register */
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*val = sign_extend32(*val >> 4, 11);
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*val = sign_extend32(*val >> shift, 15 - shift);
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ret = ads1015_set_power_state(data, false);
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if (ret < 0)
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@ -316,6 +376,7 @@ static int ads1015_read_raw(struct iio_dev *indio_dev,
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ret = IIO_VAL_INT;
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break;
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}
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case IIO_CHAN_INFO_SCALE:
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idx = data->channel_data[chan->address].pga;
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*val = ads1015_scale[idx].scale;
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@ -324,7 +385,7 @@ static int ads1015_read_raw(struct iio_dev *indio_dev,
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break;
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case IIO_CHAN_INFO_SAMP_FREQ:
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idx = data->channel_data[chan->address].data_rate;
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*val = ads1015_data_rate[idx];
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*val = data->data_rate[idx];
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ret = IIO_VAL_INT;
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break;
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default:
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@ -380,12 +441,15 @@ static const struct iio_buffer_setup_ops ads1015_buffer_setup_ops = {
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};
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static IIO_CONST_ATTR(scale_available, "3 2 1 0.5 0.25 0.125");
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static IIO_CONST_ATTR(sampling_frequency_available,
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"128 250 490 920 1600 2400 3300");
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static IIO_CONST_ATTR_NAMED(ads1015_sampling_frequency_available,
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sampling_frequency_available, "128 250 490 920 1600 2400 3300");
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static IIO_CONST_ATTR_NAMED(ads1115_sampling_frequency_available,
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sampling_frequency_available, "8 16 32 64 128 250 475 860");
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static struct attribute *ads1015_attributes[] = {
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&iio_const_attr_scale_available.dev_attr.attr,
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&iio_const_attr_sampling_frequency_available.dev_attr.attr,
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&iio_const_attr_ads1015_sampling_frequency_available.dev_attr.attr,
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NULL,
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};
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@ -393,11 +457,28 @@ static const struct attribute_group ads1015_attribute_group = {
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.attrs = ads1015_attributes,
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};
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static const struct iio_info ads1015_info = {
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static struct attribute *ads1115_attributes[] = {
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&iio_const_attr_scale_available.dev_attr.attr,
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&iio_const_attr_ads1115_sampling_frequency_available.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group ads1115_attribute_group = {
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.attrs = ads1115_attributes,
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};
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static struct iio_info ads1015_info = {
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.driver_module = THIS_MODULE,
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.read_raw = ads1015_read_raw,
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.write_raw = ads1015_write_raw,
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.attrs = &ads1015_attribute_group,
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.attrs = &ads1015_attribute_group,
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};
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static struct iio_info ads1115_info = {
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.driver_module = THIS_MODULE,
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.read_raw = ads1015_read_raw,
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.write_raw = ads1015_write_raw,
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.attrs = &ads1115_attribute_group,
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};
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#ifdef CONFIG_OF
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@ -500,12 +581,24 @@ static int ads1015_probe(struct i2c_client *client,
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mutex_init(&data->lock);
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indio_dev->dev.parent = &client->dev;
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indio_dev->info = &ads1015_info;
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indio_dev->name = ADS1015_DRV_NAME;
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indio_dev->channels = ads1015_channels;
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indio_dev->num_channels = ARRAY_SIZE(ads1015_channels);
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indio_dev->modes = INDIO_DIRECT_MODE;
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switch (id->driver_data) {
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case ADS1015:
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indio_dev->channels = ads1015_channels;
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indio_dev->num_channels = ARRAY_SIZE(ads1015_channels);
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indio_dev->info = &ads1015_info;
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data->data_rate = (unsigned int *) &ads1015_data_rate;
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break;
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case ADS1115:
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indio_dev->channels = ads1115_channels;
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indio_dev->num_channels = ARRAY_SIZE(ads1115_channels);
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indio_dev->info = &ads1115_info;
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data->data_rate = (unsigned int *) &ads1115_data_rate;
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break;
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}
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/* we need to keep this ABI the same as used by hwmon ADS1015 driver */
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ads1015_get_channels_config(client);
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@ -590,7 +683,8 @@ static const struct dev_pm_ops ads1015_pm_ops = {
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};
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static const struct i2c_device_id ads1015_id[] = {
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{"ads1015", 0},
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{"ads1015", ADS1015},
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{"ads1115", ADS1115},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, ads1015_id);
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