Add support for continuous data capture using triggered buffers for the
tmp006 sensor. The device features a "data ready" interrupt line which
is pulled down once a new measurement is ready to be read.
Signed-off-by: Antoni Pokusinski <apokusinski01@xxxxxxxxx>
---
Note:
For some reason, the checkpatch.pl returns a warning for this patch:
WARNING: Missing a blank line after declarations
#156: FILE: drivers/iio/temperature/tmp006.c:253:
+ s16 channels[2];
+ s64 ts __aligned(8);
It also suggests that the following code with a blank line is correct:
struct {
s16 channels[2];
s64 ts __aligned(8);
} scan;
I left the code as it was (with the WARNING) since it feels obviously
more natural.
---
drivers/iio/temperature/Kconfig | 2 +
drivers/iio/temperature/tmp006.c | 116 +++++++++++++++++++++++++++++--
2 files changed, 111 insertions(+), 7 deletions(-)
diff --git a/drivers/iio/temperature/Kconfig b/drivers/iio/temperature/Kconfig
index ed0e4963362f..1244d8e17d50 100644
--- a/drivers/iio/temperature/Kconfig
+++ b/drivers/iio/temperature/Kconfig
@@ -91,6 +91,8 @@ config MLX90635
config TMP006
tristate "TMP006 infrared thermopile sensor"
depends on I2C
+ select IIO_BUFFER
+ select IIO_TRIGGERED_BUFFER
help
If you say yes here you get support for the Texas Instruments
TMP006 infrared thermopile sensor.
diff --git a/drivers/iio/temperature/tmp006.c b/drivers/iio/temperature/tmp006.c
index 6d8d661f0c82..183b30a41573 100644
--- a/drivers/iio/temperature/tmp006.c
+++ b/drivers/iio/temperature/tmp006.c
@@ -7,8 +7,6 @@
* Driver for the Texas Instruments I2C 16-bit IR thermopile sensor
*
* (7-bit I2C slave address 0x40, changeable via ADR pins)
- *
- * TODO: data ready irq
*/
#include <linux/err.h>
@@ -21,6 +19,9 @@
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/trigger_consumer.h>
#define TMP006_VOBJECT 0x00
#define TMP006_TAMBIENT 0x01
@@ -45,6 +46,7 @@
struct tmp006_data {
struct i2c_client *client;
u16 config;
+ struct iio_trigger *drdy_trig;
};
static int tmp006_read_measurement(struct tmp006_data *data, u8 reg)
@@ -81,15 +83,21 @@ static int tmp006_read_raw(struct iio_dev *indio_dev,
switch (mask) {
case IIO_CHAN_INFO_RAW:
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;
+
if (channel->type == IIO_VOLTAGE) {
/* LSB is 156.25 nV */
ret = tmp006_read_measurement(data, TMP006_VOBJECT);
+ iio_device_release_direct_mode(indio_dev);
if (ret < 0)
return ret;
*val = sign_extend32(ret, 15);
} else if (channel->type == IIO_TEMP) {
/* LSB is 0.03125 degrees Celsius */
ret = tmp006_read_measurement(data, TMP006_TAMBIENT);
+ iio_device_release_direct_mode(indio_dev);
if (ret < 0)
return ret;
*val = sign_extend32(ret, 15) >> TMP006_TAMBIENT_SHIFT;
@@ -128,7 +136,7 @@ static int tmp006_write_raw(struct iio_dev *indio_dev,
long mask)
{
struct tmp006_data *data = iio_priv(indio_dev);
- int i;
+ int ret, i;
if (mask != IIO_CHAN_INFO_SAMP_FREQ)
return -EINVAL;
@@ -136,13 +144,19 @@ static int tmp006_write_raw(struct iio_dev *indio_dev,
for (i = 0; i < ARRAY_SIZE(tmp006_freqs); i++)
if ((val == tmp006_freqs[i][0]) &&
(val2 == tmp006_freqs[i][1])) {
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;
+
data->config &= ~TMP006_CONFIG_CR_MASK;
data->config |= i << TMP006_CONFIG_CR_SHIFT;
- return i2c_smbus_write_word_swapped(data->client,
- TMP006_CONFIG,
- data->config);
+ ret = i2c_smbus_write_word_swapped(data->client,
+ TMP006_CONFIG,
+ data->config);
+ iio_device_release_direct_mode(indio_dev);
+ return ret;
}
return -EINVAL;
}
@@ -164,13 +178,29 @@ static const struct iio_chan_spec tmp006_channels[] = {
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE),
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 's',
+ .realbits = 16,
+ .storagebits = 16,
+ .endianness = IIO_BE
+ }
},
{
.type = IIO_TEMP,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE),
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
- }
+ .scan_index = 1,
+ .scan_type = {
+ .sign = 's',
+ .realbits = 14,
+ .storagebits = 16,
+ .shift = TMP006_TAMBIENT_SHIFT,
+ .endianness = IIO_BE
+ }
+ },
+ IIO_CHAN_SOFT_TIMESTAMP(2)
};
static const struct iio_info tmp006_info = {
@@ -213,6 +243,49 @@ static void tmp006_powerdown_cleanup(void *dev)
tmp006_power(dev, false);
}
+static irqreturn_t tmp006_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct tmp006_data *data = iio_priv(indio_dev);
+ struct {
+ s16 channels[2];
+ s64 ts __aligned(8);
+ } scan;
+
+ scan.channels[0] = i2c_smbus_read_word_data(data->client, TMP006_VOBJECT);
+ if (scan.channels[0] < 0)
+ goto err;
+
+ scan.channels[1] = i2c_smbus_read_word_data(data->client, TMP006_TAMBIENT);
+ if (scan.channels[1] < 0)
+ goto err;
+
+ iio_push_to_buffers_with_timestamp(indio_dev, &scan,
+ iio_get_time_ns(indio_dev));
+err:
+ iio_trigger_notify_done(indio_dev->trig);
+ return IRQ_HANDLED;
+}
+
+static int tmp006_set_trigger_state(struct iio_trigger *trig, bool state)
+{
+ struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+ struct tmp006_data *data = iio_priv(indio_dev);
+
+ if (state)
+ data->config |= TMP006_CONFIG_DRDY_EN;
+ else
+ data->config &= ~TMP006_CONFIG_DRDY_EN;
+
+ return i2c_smbus_write_word_swapped(data->client, TMP006_CONFIG,
+ data->config);
+}
+
+static const struct iio_trigger_ops tmp006_trigger_ops = {
+ .set_trigger_state = tmp006_set_trigger_state,
+};
+
static int tmp006_probe(struct i2c_client *client)
{
struct iio_dev *indio_dev;
@@ -258,6 +331,35 @@ static int tmp006_probe(struct i2c_client *client)
if (ret < 0)
return ret;
+ if (client->irq > 0) {
+ data->drdy_trig = devm_iio_trigger_alloc(&client->dev,
+ "%s-dev%d",
+ indio_dev->name,
+ iio_device_id(indio_dev));
+ if (!data->drdy_trig)
+ return -ENOMEM;
+
+ data->drdy_trig->ops = &tmp006_trigger_ops;
+ iio_trigger_set_drvdata(data->drdy_trig, indio_dev);
+ ret = iio_trigger_register(data->drdy_trig);
+ if (ret)
+ return ret;
+
+ indio_dev->trig = iio_trigger_get(data->drdy_trig);
+
+ ret = devm_request_threaded_irq(&client->dev, client->irq,
+ iio_trigger_generic_data_rdy_poll,
+ NULL,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ "tmp006_irq",
+ data->drdy_trig);
+ if (ret < 0)
+ return ret;
+ }
+
+ ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, NULL,
+ tmp006_trigger_handler, NULL);
+
return devm_iio_device_register(&client->dev, indio_dev);
}
--
2.25.1
