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Diffstat (limited to 'drivers/iio/gyro/st_gyro_buffer.c')
-rw-r--r--drivers/iio/gyro/st_gyro_buffer.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/drivers/iio/gyro/st_gyro_buffer.c b/drivers/iio/gyro/st_gyro_buffer.c
new file mode 100644
index 000000000000..da4d122ec7dc
--- /dev/null
+++ b/drivers/iio/gyro/st_gyro_buffer.c
@@ -0,0 +1,114 @@
+/*
+ * STMicroelectronics gyroscopes driver
+ *
+ * Copyright 2012-2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/delay.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/iio/common/st_sensors.h>
+#include "st_gyro.h"
+
+int st_gyro_trig_set_state(struct iio_trigger *trig, bool state)
+{
+ struct iio_dev *indio_dev = trig->private_data;
+
+ return st_sensors_set_dataready_irq(indio_dev, state);
+}
+
+static int st_gyro_buffer_preenable(struct iio_dev *indio_dev)
+{
+ int err;
+
+ err = st_sensors_set_enable(indio_dev, true);
+ if (err < 0)
+ goto st_gyro_set_enable_error;
+
+ err = iio_sw_buffer_preenable(indio_dev);
+
+st_gyro_set_enable_error:
+ return err;
+}
+
+static int st_gyro_buffer_postenable(struct iio_dev *indio_dev)
+{
+ int err;
+ struct st_sensor_data *gdata = iio_priv(indio_dev);
+
+ gdata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
+ if (gdata->buffer_data == NULL) {
+ err = -ENOMEM;
+ goto allocate_memory_error;
+ }
+
+ err = st_sensors_set_axis_enable(indio_dev,
+ (u8)indio_dev->active_scan_mask[0]);
+ if (err < 0)
+ goto st_gyro_buffer_postenable_error;
+
+ err = iio_triggered_buffer_postenable(indio_dev);
+ if (err < 0)
+ goto st_gyro_buffer_postenable_error;
+
+ return err;
+
+st_gyro_buffer_postenable_error:
+ kfree(gdata->buffer_data);
+allocate_memory_error:
+ return err;
+}
+
+static int st_gyro_buffer_predisable(struct iio_dev *indio_dev)
+{
+ int err;
+ struct st_sensor_data *gdata = iio_priv(indio_dev);
+
+ err = iio_triggered_buffer_predisable(indio_dev);
+ if (err < 0)
+ goto st_gyro_buffer_predisable_error;
+
+ err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
+ if (err < 0)
+ goto st_gyro_buffer_predisable_error;
+
+ err = st_sensors_set_enable(indio_dev, false);
+
+st_gyro_buffer_predisable_error:
+ kfree(gdata->buffer_data);
+ return err;
+}
+
+static const struct iio_buffer_setup_ops st_gyro_buffer_setup_ops = {
+ .preenable = &st_gyro_buffer_preenable,
+ .postenable = &st_gyro_buffer_postenable,
+ .predisable = &st_gyro_buffer_predisable,
+};
+
+int st_gyro_allocate_ring(struct iio_dev *indio_dev)
+{
+ return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
+ &st_sensors_trigger_handler, &st_gyro_buffer_setup_ops);
+}
+
+void st_gyro_deallocate_ring(struct iio_dev *indio_dev)
+{
+ iio_triggered_buffer_cleanup(indio_dev);
+}
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics gyroscopes buffer");
+MODULE_LICENSE("GPL v2");