iio: srf08: add triggered buffer support

Add support for triggered buffers.

Data format is quite simple:
  distance     16 Bit
  alignment    48 Bit
  timestamp    64 Bit

Signed-off-by: Andreas Klinger <ak@it-klinger.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/proximity/srf08.c b/drivers/iio/proximity/srf08.c
index 3f19536f215f920b4f8449854644424fdefb7a1d..de699d67310aa48c389d57a368acfe4ed9a49fb5 100644 (file)
--- a/drivers/iio/proximity/srf08.c
+++ b/drivers/iio/proximity/srf08.c
@@ -18,6 +18,9 @@
 #include <linux/bitops.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
 
 /* registers of SRF08 device */
 #define SRF08_WRITE_COMMAND    0x00    /* Command Register */
@@ -35,9 +38,22 @@
 
 struct srf08_data {
        struct i2c_client       *client;
-       int                     sensitivity;            /* Gain */
-       int                     range_mm;               /* max. Range in mm */
+
+       /*
+        * Gain in the datasheet is called sensitivity here to distinct it
+        * from the gain used with amplifiers of adc's
+        */
+       int                     sensitivity;
+
+       /* max. Range in mm */
+       int                     range_mm;
        struct mutex            lock;
+
+       /*
+        * triggered buffer
+        * 1x16-bit channel + 3x16 padding + 4x16 timestamp
+        */
+       s16                     buffer[8];
 };
 
 /*
@@ -110,6 +126,29 @@ static int srf08_read_ranging(struct srf08_data *data)
        return ret;
 }
 
+static irqreturn_t srf08_trigger_handler(int irq, void *p)
+{
+       struct iio_poll_func *pf = p;
+       struct iio_dev *indio_dev = pf->indio_dev;
+       struct srf08_data *data = iio_priv(indio_dev);
+       s16 sensor_data;
+
+       sensor_data = srf08_read_ranging(data);
+       if (sensor_data < 0)
+               goto err;
+
+       mutex_lock(&data->lock);
+
+       data->buffer[0] = sensor_data;
+       iio_push_to_buffers_with_timestamp(indio_dev,
+                                               data->buffer, pf->timestamp);
+
+       mutex_unlock(&data->lock);
+err:
+       iio_trigger_notify_done(indio_dev->trig);
+       return IRQ_HANDLED;
+}
+
 static int srf08_read_raw(struct iio_dev *indio_dev,
                            struct iio_chan_spec const *channel, int *val,
                            int *val2, long mask)
@@ -323,7 +362,15 @@ static const struct iio_chan_spec srf08_channels[] = {
                .info_mask_separate =
                                BIT(IIO_CHAN_INFO_RAW) |
                                BIT(IIO_CHAN_INFO_SCALE),
+               .scan_index = 0,
+               .scan_type = {
+                       .sign = 's',
+                       .realbits = 16,
+                       .storagebits = 16,
+                       .endianness = IIO_CPU,
+               },
        },
+       IIO_CHAN_SOFT_TIMESTAMP(1),
 };
 
 static const struct iio_info srf08_info = {
@@ -362,6 +409,13 @@ static int srf08_probe(struct i2c_client *client,
 
        mutex_init(&data->lock);
 
+       ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev,
+                       iio_pollfunc_store_time, srf08_trigger_handler, NULL);
+       if (ret < 0) {
+               dev_err(&client->dev, "setup of iio triggered buffer failed\n");
+               return ret;
+       }
+
        /*
         * set default values of device here
         * these register values cannot be read from the hardware
@@ -402,5 +456,5 @@ static struct i2c_driver srf08_driver = {
 module_i2c_driver(srf08_driver);
 
 MODULE_AUTHOR("Andreas Klinger <ak@it-klinger.de>");
-MODULE_DESCRIPTION("Devantech SRF08 ultrasonic ranger driver");
+MODULE_DESCRIPTION("Devantech SRF08/SRF10 ultrasonic ranger driver");
 MODULE_LICENSE("GPL");