summaryrefslogtreecommitdiffstats
path: root/drivers/iio/accel/st_accel_buffer.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2013-02-21 12:11:44 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-21 12:11:44 -0800
commitb5c78e04dd061b776978dad61dd85357081147b0 (patch)
tree2416b2dc61c452c3aeb2a32bcedf15e6257be638 /drivers/iio/accel/st_accel_buffer.c
parent06991c28f37ad68e5c03777f5c3b679b56e3dac1 (diff)
parent951348b377385475aa256c27e1c9e2564c9ec160 (diff)
Merge tag 'staging-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
Pull staging tree update from Greg Kroah-Hartman: "Here's the big staging tree merge for 3.9-rc1 Lots of cleanups and updates for drivers all through the staging tree. We are pretty much "code neutral" here, adding just about as many lines as we removed. All of these have been in linux-next for a while." * tag 'staging-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (804 commits) staging: comedi: vmk80xx: wait for URBs to complete staging: comedi: drivers: addi-data: hwdrv_apci3200.c: Add a missing semicolon staging: et131x: Update TODO list staging: et131x: Remove assignment of skb->dev staging: wlan-ng: hfa384x.h: fix for error reported by smatch staging/zache checkpatch ERROR: spaces prohibited around that staging/ozwpan: Mark read only parameters and structs as const staging/ozwpan: Remove empty and unused function oz_cdev_heartbeat staging/ozwpan: Mark local functions as static (fix sparse warnings) staging/ozwpan: Add missing header includes staging/usbip: Mark local functions as static (fix sparse warnings) staging/xgifb: Remove duplicated code in loops. staging/xgifb: Consolidate return paths staging/xgifb: Remove code without effect staging/xgifb: Remove unnecessary casts staging/xgifb: Consolidate if/else if with identical code branches staging: vt6656: replaced custom TRUE definition with true staging: vt6656: replaced custom FALSE definition with false staging: vt6656: replace custom BOOL definition with bool staging/rtl8187se: Mark functions as static to silence sparse ...
Diffstat (limited to 'drivers/iio/accel/st_accel_buffer.c')
-rw-r--r--drivers/iio/accel/st_accel_buffer.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/drivers/iio/accel/st_accel_buffer.c b/drivers/iio/accel/st_accel_buffer.c
new file mode 100644
index 00000000000..6bd82c7f769
--- /dev/null
+++ b/drivers/iio/accel/st_accel_buffer.c
@@ -0,0 +1,114 @@
+/*
+ * STMicroelectronics accelerometers 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_accel.h"
+
+int st_accel_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_accel_buffer_preenable(struct iio_dev *indio_dev)
+{
+ int err;
+
+ err = st_sensors_set_enable(indio_dev, true);
+ if (err < 0)
+ goto st_accel_set_enable_error;
+
+ err = iio_sw_buffer_preenable(indio_dev);
+
+st_accel_set_enable_error:
+ return err;
+}
+
+static int st_accel_buffer_postenable(struct iio_dev *indio_dev)
+{
+ int err;
+ struct st_sensor_data *adata = iio_priv(indio_dev);
+
+ adata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
+ if (adata->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_accel_buffer_postenable_error;
+
+ err = iio_triggered_buffer_postenable(indio_dev);
+ if (err < 0)
+ goto st_accel_buffer_postenable_error;
+
+ return err;
+
+st_accel_buffer_postenable_error:
+ kfree(adata->buffer_data);
+allocate_memory_error:
+ return err;
+}
+
+static int st_accel_buffer_predisable(struct iio_dev *indio_dev)
+{
+ int err;
+ struct st_sensor_data *adata = iio_priv(indio_dev);
+
+ err = iio_triggered_buffer_predisable(indio_dev);
+ if (err < 0)
+ goto st_accel_buffer_predisable_error;
+
+ err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS);
+ if (err < 0)
+ goto st_accel_buffer_predisable_error;
+
+ err = st_sensors_set_enable(indio_dev, false);
+
+st_accel_buffer_predisable_error:
+ kfree(adata->buffer_data);
+ return err;
+}
+
+static const struct iio_buffer_setup_ops st_accel_buffer_setup_ops = {
+ .preenable = &st_accel_buffer_preenable,
+ .postenable = &st_accel_buffer_postenable,
+ .predisable = &st_accel_buffer_predisable,
+};
+
+int st_accel_allocate_ring(struct iio_dev *indio_dev)
+{
+ return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
+ &st_sensors_trigger_handler, &st_accel_buffer_setup_ops);
+}
+
+void st_accel_deallocate_ring(struct iio_dev *indio_dev)
+{
+ iio_triggered_buffer_cleanup(indio_dev);
+}
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics accelerometers buffer");
+MODULE_LICENSE("GPL v2");