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Message-ID: <20240902122557.129013-3-abhashkumarjha123@gmail.com>
Date: Mon, 2 Sep 2024 17:55:56 +0530
From: Abhash Jha <abhashkumarjha123@...il.com>
To: linux-iio@...r.kernel.org
Cc: songqiang1304521@...il.com,
jic23@...nel.org,
lars@...afoo.de,
linux-kernel@...r.kernel.org,
Abhash Jha <abhashkumarjha123@...il.com>
Subject: [PATCH v2 2/2] iio: proximity: vl53l0x-i2c: Added continuous mode support
The continuous mode of the sensor is enabled in the buffer_postenable.
Replaced the original irq handler with a threaded irq handler to perform
i2c reads during continuous mode.
The continuous mode is disabled by disabling the buffer.
Added a trigger for this device to be used for continuous mode.
Signed-off-by: Abhash Jha <abhashkumarjha123@...il.com>
---
drivers/iio/proximity/vl53l0x-i2c.c | 162 +++++++++++++++++++++++-----
1 file changed, 137 insertions(+), 25 deletions(-)
diff --git a/drivers/iio/proximity/vl53l0x-i2c.c b/drivers/iio/proximity/vl53l0x-i2c.c
index 31d6aeb95..26183c352 100644
--- a/drivers/iio/proximity/vl53l0x-i2c.c
+++ b/drivers/iio/proximity/vl53l0x-i2c.c
@@ -22,6 +22,10 @@
#include <linux/module.h>
#include <linux/iio/iio.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
#define VL_REG_SYSRANGE_START 0x00
@@ -49,14 +53,75 @@ struct vl53l0x_data {
struct completion completion;
struct regulator *vdd_supply;
struct gpio_desc *reset_gpio;
+ struct iio_trigger *trig;
+
+ struct {
+ u16 chan;
+ s64 timestamp __aligned(8);
+ } scan;
};
-static irqreturn_t vl53l0x_handle_irq(int irq, void *priv)
+static int vl53l0x_clear_irq(struct vl53l0x_data *data)
+{
+ struct device *dev = &data->client->dev;
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(data->client,
+ VL_REG_SYSTEM_INTERRUPT_CLEAR, 1);
+ if (ret < 0)
+ dev_err(dev, "failed to clear error irq: %d\n", ret);
+
+ ret = i2c_smbus_write_byte_data(data->client,
+ VL_REG_SYSTEM_INTERRUPT_CLEAR, 0);
+ if (ret < 0)
+ dev_err(dev, "failed to clear range irq: %d\n", ret);
+
+ ret = i2c_smbus_read_byte_data(data->client, VL_REG_RESULT_INT_STATUS);
+ if (ret < 0 || ret & 0x07) {
+ dev_err(dev, "failed to clear irq: %d\n", ret);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static irqreturn_t vl53l0x_trigger_handler(int irq, void *priv)
+{
+ struct iio_poll_func *pf = priv;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct vl53l0x_data *data = iio_priv(indio_dev);
+ u8 buffer[12];
+ int ret;
+
+ ret = i2c_smbus_read_i2c_block_data(data->client,
+ VL_REG_RESULT_RANGE_STATUS,
+ sizeof(buffer), buffer);
+ if (ret < 0)
+ return ret;
+ else if (ret != 12)
+ return -EREMOTEIO;
+
+ data->scan.chan = get_unaligned_be16(&buffer[10]);
+ iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
+ iio_get_time_ns(indio_dev));
+
+ iio_trigger_notify_done(indio_dev->trig);
+ ret = vl53l0x_clear_irq(data);
+ if (ret < 0)
+ return ret;
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t vl53l0x_threaded_irq(int irq, void *priv)
{
struct iio_dev *indio_dev = priv;
struct vl53l0x_data *data = iio_priv(indio_dev);
- complete(&data->completion);
+ if (iio_buffer_enabled(indio_dev))
+ iio_trigger_poll_nested(indio_dev->trig);
+ else
+ complete(&data->completion);
return IRQ_HANDLED;
}
@@ -71,8 +136,9 @@ static int vl53l0x_configure_irq(struct i2c_client *client,
if (!irq_flags)
irq_flags = IRQF_TRIGGER_FALLING;
- ret = devm_request_irq(&client->dev, client->irq, vl53l0x_handle_irq,
- irq_flags, indio_dev->name, indio_dev);
+ ret = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL, vl53l0x_threaded_irq,
+ irq_flags | IRQF_ONESHOT, indio_dev->name, indio_dev);
if (ret) {
dev_err(&client->dev, "devm_request_irq error: %d\n", ret);
return ret;
@@ -87,26 +153,6 @@ static int vl53l0x_configure_irq(struct i2c_client *client,
return ret;
}
-static void vl53l0x_clear_irq(struct vl53l0x_data *data)
-{
- struct device *dev = &data->client->dev;
- int ret;
-
- ret = i2c_smbus_write_byte_data(data->client,
- VL_REG_SYSTEM_INTERRUPT_CLEAR, 1);
- if (ret < 0)
- dev_err(dev, "failed to clear error irq: %d\n", ret);
-
- ret = i2c_smbus_write_byte_data(data->client,
- VL_REG_SYSTEM_INTERRUPT_CLEAR, 0);
- if (ret < 0)
- dev_err(dev, "failed to clear range irq: %d\n", ret);
-
- ret = i2c_smbus_read_byte_data(data->client, VL_REG_RESULT_INT_STATUS);
- if (ret < 0 || ret & 0x07)
- dev_err(dev, "failed to clear irq: %d\n", ret);
-}
-
static int vl53l0x_read_proximity(struct vl53l0x_data *data,
const struct iio_chan_spec *chan,
int *val)
@@ -128,7 +174,9 @@ static int vl53l0x_read_proximity(struct vl53l0x_data *data,
if (time_left == 0)
return -ETIMEDOUT;
- vl53l0x_clear_irq(data);
+ ret = vl53l0x_clear_irq(data);
+ if (ret < 0)
+ return ret;
} else {
do {
ret = i2c_smbus_read_byte_data(client,
@@ -163,7 +211,14 @@ static const struct iio_chan_spec vl53l0x_channels[] = {
.type = IIO_DISTANCE,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE),
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 12,
+ .storagebits = 16,
+ },
},
+ IIO_CHAN_SOFT_TIMESTAMP(32),
};
static int vl53l0x_read_raw(struct iio_dev *indio_dev,
@@ -221,6 +276,41 @@ static int vl53l0x_power_on(struct vl53l0x_data *data)
return 0;
}
+static int vl53l0x_buffer_postenable(struct iio_dev *indio_dev)
+{
+ struct vl53l0x_data *data = iio_priv(indio_dev);
+
+ return i2c_smbus_write_byte_data(data->client, VL_REG_SYSRANGE_START, 0x02);
+}
+
+static int vl53l0x_buffer_postdisable(struct iio_dev *indio_dev)
+{
+ struct vl53l0x_data *data = iio_priv(indio_dev);
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(data->client, VL_REG_SYSRANGE_START, 0x01);
+ if (ret < 0)
+ return ret;
+
+ /* Let the ongoing reading finish */
+ reinit_completion(&data->completion);
+ wait_for_completion_timeout(&data->completion, HZ/10);
+ vl53l0x_clear_irq(data);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static const struct iio_buffer_setup_ops iio_triggered_buffer_setup_ops = {
+ .postenable = &vl53l0x_buffer_postenable,
+ .postdisable = &vl53l0x_buffer_postdisable,
+};
+
+static const struct iio_trigger_ops vl53l0x_trigger_ops = {
+ .validate_device = iio_trigger_validate_own_device,
+};
+
static int vl53l0x_probe(struct i2c_client *client)
{
struct vl53l0x_data *data;
@@ -278,9 +368,31 @@ static int vl53l0x_probe(struct i2c_client *client)
if (client->irq) {
init_completion(&data->completion);
+ data->trig = devm_iio_trigger_alloc(&client->dev, "%s-dev%d",
+ indio_dev->name,
+ iio_device_id(indio_dev));
+ if (!data->trig)
+ return -ENOMEM;
+
+ data->trig->ops = &vl53l0x_trigger_ops;
+ iio_trigger_set_drvdata(data->trig, indio_dev);
+ ret = devm_iio_trigger_register(&client->dev, data->trig);
+ if (ret)
+ return ret;
+
+ indio_dev->trig = iio_trigger_get(data->trig);
+
ret = vl53l0x_configure_irq(client, indio_dev);
if (ret)
return ret;
+
+ ret = devm_iio_triggered_buffer_setup(&client->dev,
+ indio_dev,
+ NULL,
+ &vl53l0x_trigger_handler,
+ &iio_triggered_buffer_setup_ops);
+ if (ret)
+ return ret;
}
return devm_iio_device_register(&client->dev, indio_dev);
--
2.43.0
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