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ti-adc081c: Initial triggered buffer support 

Using this requires software triggers like CONFIG_IIO_HRTIMER_TRIGGER.

The device can be configured to do internal periodic sampling but does not
offer some sort of interrupt on data ready. Interrupts can only trigger when
values get out of a specific range.

Signed-off-by: Crestez Dan Leonard <leonard.crestez@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
hifive-unleashed-5.1
Crestez Dan Leonard 2016-04-11 17:24:27 +03:00 committed by Jonathan Cameron
parent a6b5ec887b
commit 08e05d1fce
1 changed files with 64 additions and 13 deletions
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77
drivers/iio/adc/ti-adc081c.c
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@ -24,6 +24,9 @@
#include <linux/of.h>
#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/regulator/consumer.h>
struct adc081c {
@ -69,21 +72,42 @@ static int adc081c_read_raw(struct iio_dev *iio,
return -EINVAL;
}
static const struct iio_chan_spec adc081c_channel = {
.type = IIO_VOLTAGE,
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
};
#define ADCxx1C_CHAN(_bits) { \
.type = IIO_VOLTAGE, \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.scan_type = { \
.sign = 'u', \
.realbits = (_bits), \
.storagebits = 16, \
.shift = 12 - (_bits), \
.endianness = IIO_CPU, \
}, \
}
#define DEFINE_ADCxx1C_CHANNELS(_name, _bits) \
static const struct iio_chan_spec _name ## _channels[] = { \
ADCxx1C_CHAN((_bits)), \
IIO_CHAN_SOFT_TIMESTAMP(1), \
}; \
#define ADC081C_NUM_CHANNELS 2
struct adcxx1c_model {
const struct iio_chan_spec* channels;
int bits;
};
#define ADCxx1C_MODEL(_bits) \
#define ADCxx1C_MODEL(_name, _bits) \
{ \
.channels = _name ## _channels, \
.bits = (_bits), \
}
DEFINE_ADCxx1C_CHANNELS(adc081c, 8);
DEFINE_ADCxx1C_CHANNELS(adc101c, 10);
DEFINE_ADCxx1C_CHANNELS(adc121c, 12);
/* Model ids are indexes in _models array */
enum adcxx1c_model_id {
ADC081C = 0,
@ -92,9 +116,9 @@ enum adcxx1c_model_id {
};
static struct adcxx1c_model adcxx1c_models[] = {
ADCxx1C_MODEL( 8),
ADCxx1C_MODEL(10),
ADCxx1C_MODEL(12),
ADCxx1C_MODEL(adc081c, 8),
ADCxx1C_MODEL(adc101c, 10),
ADCxx1C_MODEL(adc121c, 12),
};
static const struct iio_info adc081c_info = {
@ -102,6 +126,24 @@ static const struct iio_info adc081c_info = {
.driver_module = THIS_MODULE,
};
static irqreturn_t adc081c_trigger_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct adc081c *data = iio_priv(indio_dev);
u16 buf[8]; /* 2 bytes data + 6 bytes padding + 8 bytes timestamp */
int ret;
ret = i2c_smbus_read_word_swapped(data->i2c, REG_CONV_RES);
if (ret < 0)
goto out;
buf[0] = ret;
iio_push_to_buffers_with_timestamp(indio_dev, buf, iio_get_time_ns());
out:
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static int adc081c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@ -134,18 +176,26 @@ static int adc081c_probe(struct i2c_client *client,
iio->modes = INDIO_DIRECT_MODE;
iio->info = &adc081c_info;
iio->channels = &adc081c_channel;
iio->num_channels = 1;
iio->channels = model->channels;
iio->num_channels = ADC081C_NUM_CHANNELS;
err = iio_triggered_buffer_setup(iio, NULL, adc081c_trigger_handler, NULL);
if (err < 0) {
dev_err(&client->dev, "iio triggered buffer setup failed\n");
goto err_regulator_disable;
}
err = iio_device_register(iio);
if (err < 0)
goto regulator_disable;
goto err_buffer_cleanup;
i2c_set_clientdata(client, iio);
return 0;
regulator_disable:
err_buffer_cleanup:
iio_triggered_buffer_cleanup(iio);
err_regulator_disable:
regulator_disable(adc->ref);
return err;
@ -157,6 +207,7 @@ static int adc081c_remove(struct i2c_client *client)
struct adc081c *adc = iio_priv(iio);
iio_device_unregister(iio);
iio_triggered_buffer_cleanup(iio);
regulator_disable(adc->ref);
return 0;