Commit ba35f111 authored by Matt Ranostay's avatar Matt Ranostay Committed by Jonathan Cameron

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: default avatarMatt Ranostay <matt.ranostay@intel.com>
Acked-by: default avatarDaniel Baluta <daniel.baluta@intel.com>
Acked-by: default avatarCrt Mori <cmo@melexis.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 9d75db36
...@@ -55,6 +55,11 @@ ...@@ -55,6 +55,11 @@
#define ADS1015_DEFAULT_DATA_RATE 4 #define ADS1015_DEFAULT_DATA_RATE 4
#define ADS1015_DEFAULT_CHAN 0 #define ADS1015_DEFAULT_CHAN 0
enum {
ADS1015,
ADS1115,
};
enum ads1015_channels { enum ads1015_channels {
ADS1015_AIN0_AIN1 = 0, ADS1015_AIN0_AIN1 = 0,
ADS1015_AIN0_AIN3, ADS1015_AIN0_AIN3,
...@@ -71,6 +76,10 @@ static const unsigned int ads1015_data_rate[] = { ...@@ -71,6 +76,10 @@ static const unsigned int ads1015_data_rate[] = {
128, 250, 490, 920, 1600, 2400, 3300, 3300 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 { static const struct {
int scale; int scale;
int uscale; int uscale;
...@@ -123,6 +132,42 @@ static const struct { ...@@ -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 ads1015_data {
struct regmap *regmap; struct regmap *regmap;
/* /*
...@@ -131,6 +176,8 @@ struct ads1015_data { ...@@ -131,6 +176,8 @@ struct ads1015_data {
*/ */
struct mutex lock; struct mutex lock;
struct ads1015_channel_data channel_data[ADS1015_CHANNELS]; struct ads1015_channel_data channel_data[ADS1015_CHANNELS];
unsigned int *data_rate;
}; };
static bool ads1015_is_writeable_reg(struct device *dev, unsigned int reg) static bool ads1015_is_writeable_reg(struct device *dev, unsigned int reg)
...@@ -157,6 +204,18 @@ static const struct iio_chan_spec ads1015_channels[] = { ...@@ -157,6 +204,18 @@ static const struct iio_chan_spec ads1015_channels[] = {
IIO_CHAN_SOFT_TIMESTAMP(ADS1015_TIMESTAMP), 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) static int ads1015_set_power_state(struct ads1015_data *data, bool on)
{ {
int ret; int ret;
...@@ -196,7 +255,7 @@ int ads1015_get_adc_result(struct ads1015_data *data, int chan, int *val) ...@@ -196,7 +255,7 @@ int ads1015_get_adc_result(struct ads1015_data *data, int chan, int *val)
return ret; return ret;
if (change) { 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); usleep_range(conv_time, conv_time + 1);
} }
...@@ -263,7 +322,7 @@ static int ads1015_set_data_rate(struct ads1015_data *data, int chan, int rate) ...@@ -263,7 +322,7 @@ static int ads1015_set_data_rate(struct ads1015_data *data, int chan, int rate)
int i, ret, rindex = -1; int i, ret, rindex = -1;
for (i = 0; i < ARRAY_SIZE(ads1015_data_rate); i++) for (i = 0; i < ARRAY_SIZE(ads1015_data_rate); i++)
if (ads1015_data_rate[i] == rate) { if (data->data_rate[i] == rate) {
rindex = i; rindex = i;
break; break;
} }
...@@ -291,7 +350,9 @@ static int ads1015_read_raw(struct iio_dev *indio_dev, ...@@ -291,7 +350,9 @@ static int ads1015_read_raw(struct iio_dev *indio_dev,
mutex_lock(&indio_dev->mlock); mutex_lock(&indio_dev->mlock);
mutex_lock(&data->lock); mutex_lock(&data->lock);
switch (mask) { switch (mask) {
case IIO_CHAN_INFO_RAW: case IIO_CHAN_INFO_RAW: {
int shift = chan->scan_type.shift;
if (iio_buffer_enabled(indio_dev)) { if (iio_buffer_enabled(indio_dev)) {
ret = -EBUSY; ret = -EBUSY;
break; break;
...@@ -307,8 +368,7 @@ static int ads1015_read_raw(struct iio_dev *indio_dev, ...@@ -307,8 +368,7 @@ static int ads1015_read_raw(struct iio_dev *indio_dev,
break; break;
} }
/* 12 bit res, D0 is bit 4 in conversion register */ *val = sign_extend32(*val >> shift, 15 - shift);
*val = sign_extend32(*val >> 4, 11);
ret = ads1015_set_power_state(data, false); ret = ads1015_set_power_state(data, false);
if (ret < 0) if (ret < 0)
...@@ -316,6 +376,7 @@ static int ads1015_read_raw(struct iio_dev *indio_dev, ...@@ -316,6 +376,7 @@ static int ads1015_read_raw(struct iio_dev *indio_dev,
ret = IIO_VAL_INT; ret = IIO_VAL_INT;
break; break;
}
case IIO_CHAN_INFO_SCALE: case IIO_CHAN_INFO_SCALE:
idx = data->channel_data[chan->address].pga; idx = data->channel_data[chan->address].pga;
*val = ads1015_scale[idx].scale; *val = ads1015_scale[idx].scale;
...@@ -324,7 +385,7 @@ static int ads1015_read_raw(struct iio_dev *indio_dev, ...@@ -324,7 +385,7 @@ static int ads1015_read_raw(struct iio_dev *indio_dev,
break; break;
case IIO_CHAN_INFO_SAMP_FREQ: case IIO_CHAN_INFO_SAMP_FREQ:
idx = data->channel_data[chan->address].data_rate; idx = data->channel_data[chan->address].data_rate;
*val = ads1015_data_rate[idx]; *val = data->data_rate[idx];
ret = IIO_VAL_INT; ret = IIO_VAL_INT;
break; break;
default: default:
...@@ -380,12 +441,15 @@ static const struct iio_buffer_setup_ops ads1015_buffer_setup_ops = { ...@@ -380,12 +441,15 @@ 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(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[] = { static struct attribute *ads1015_attributes[] = {
&iio_const_attr_scale_available.dev_attr.attr, &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, NULL,
}; };
...@@ -393,11 +457,28 @@ static const struct attribute_group ads1015_attribute_group = { ...@@ -393,11 +457,28 @@ static const struct attribute_group ads1015_attribute_group = {
.attrs = ads1015_attributes, .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, .driver_module = THIS_MODULE,
.read_raw = ads1015_read_raw, .read_raw = ads1015_read_raw,
.write_raw = ads1015_write_raw, .write_raw = ads1015_write_raw,
.attrs = &ads1015_attribute_group, .attrs = &ads1115_attribute_group,
}; };
#ifdef CONFIG_OF #ifdef CONFIG_OF
...@@ -500,12 +581,24 @@ static int ads1015_probe(struct i2c_client *client, ...@@ -500,12 +581,24 @@ static int ads1015_probe(struct i2c_client *client,
mutex_init(&data->lock); mutex_init(&data->lock);
indio_dev->dev.parent = &client->dev; indio_dev->dev.parent = &client->dev;
indio_dev->info = &ads1015_info;
indio_dev->name = ADS1015_DRV_NAME; 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; 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 */ /* we need to keep this ABI the same as used by hwmon ADS1015 driver */
ads1015_get_channels_config(client); ads1015_get_channels_config(client);
...@@ -590,7 +683,8 @@ static const struct dev_pm_ops ads1015_pm_ops = { ...@@ -590,7 +683,8 @@ static const struct dev_pm_ops ads1015_pm_ops = {
}; };
static const struct i2c_device_id ads1015_id[] = { static const struct i2c_device_id ads1015_id[] = {
{"ads1015", 0}, {"ads1015", ADS1015},
{"ads1115", ADS1115},
{} {}
}; };
MODULE_DEVICE_TABLE(i2c, ads1015_id); MODULE_DEVICE_TABLE(i2c, ads1015_id);
......
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