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Subject[PATCH v2 3/5] iio: sensorhub: Add sensorhub iio commons
Date
This patch adds common library for sensorhub iio drivers.

Signed-off-by: Karol Wrona <k.wrona@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
---
drivers/iio/common/Kconfig | 1 +
drivers/iio/common/Makefile | 1 +
drivers/iio/common/ssp_sensors/Kconfig | 13 ++++
drivers/iio/common/ssp_sensors/Makefile | 5 ++
drivers/iio/common/ssp_sensors/ssp_iio.c | 81 +++++++++++++++++++++++
drivers/iio/common/ssp_sensors/ssp_iio_sensor.h | 59 +++++++++++++++++
6 files changed, 160 insertions(+)
create mode 100644 drivers/iio/common/ssp_sensors/Kconfig
create mode 100644 drivers/iio/common/ssp_sensors/Makefile
create mode 100644 drivers/iio/common/ssp_sensors/ssp_iio.c
create mode 100644 drivers/iio/common/ssp_sensors/ssp_iio_sensor.h

diff --git a/drivers/iio/common/Kconfig b/drivers/iio/common/Kconfig
index 0b6e97d..630f9d8 100644
--- a/drivers/iio/common/Kconfig
+++ b/drivers/iio/common/Kconfig
@@ -4,3 +4,4 @@

source "drivers/iio/common/hid-sensors/Kconfig"
source "drivers/iio/common/st_sensors/Kconfig"
+source "drivers/iio/common/ssp_sensors/Kconfig"
diff --git a/drivers/iio/common/Makefile b/drivers/iio/common/Makefile
index 3112df0..5119642 100644
--- a/drivers/iio/common/Makefile
+++ b/drivers/iio/common/Makefile
@@ -9,3 +9,4 @@
# When adding new entries keep the list in alphabetical order
obj-y += hid-sensors/
obj-y += st_sensors/
+obj-y += ssp_sensors/
diff --git a/drivers/iio/common/ssp_sensors/Kconfig b/drivers/iio/common/ssp_sensors/Kconfig
new file mode 100644
index 0000000..3c10f6f
--- /dev/null
+++ b/drivers/iio/common/ssp_sensors/Kconfig
@@ -0,0 +1,13 @@
+#
+# SSP Sensor common modules
+#
+menu "SSP Sensor IIO Common"
+
+config SSP_SENSOR_IIO
+ tristate "Commons for all SSP Sensor IIO drivers"
+ depends on SENSORS_SAMSUNG_SSP
+ select IIO_BUFFER
+ help
+ Say yes here to build commons for SSP sensors.
+
+endmenu
diff --git a/drivers/iio/common/ssp_sensors/Makefile b/drivers/iio/common/ssp_sensors/Makefile
new file mode 100644
index 0000000..f39f109
--- /dev/null
+++ b/drivers/iio/common/ssp_sensors/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for the SSP sensor common modules.
+#
+
+obj-$(CONFIG_SSP_SENSOR_IIO) += ssp_iio.o
diff --git a/drivers/iio/common/ssp_sensors/ssp_iio.c b/drivers/iio/common/ssp_sensors/ssp_iio.c
new file mode 100644
index 0000000..bbe9e5e
--- /dev/null
+++ b/drivers/iio/common/ssp_sensors/ssp_iio.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2014, Samsung Electronics Co. Ltd. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/iio/common/ssp_sensors.h>
+#include <linux/iio/kfifo_buf.h>
+#include "ssp_iio_sensor.h"
+
+/**
+ * ssp_common_buffer_postenable() - generic postenable callback for ssp buffer
+ *
+ * @indio_dev: iio device
+ *
+ * Returns 0 or negative value in case of error
+ */
+int ssp_common_buffer_postenable(struct iio_dev *indio_dev)
+{
+ struct ssp_sensor_data *c = iio_priv(indio_dev);
+ struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
+
+ return ssp_enable_sensor(data, c->type,
+ ssp_get_sensor_delay(data, c->type));
+}
+EXPORT_SYMBOL(ssp_common_buffer_postenable);
+
+/**
+ * ssp_common_buffer_predisable() - generic predisable callback for ssp buffer
+ *
+ * @indio_dev: iio device
+ *
+ * Returns 0 or negative value in case of error
+ */
+int ssp_common_buffer_predisable(struct iio_dev *indio_dev)
+{
+ struct ssp_sensor_data *c = iio_priv(indio_dev);
+ struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
+
+ return ssp_disable_sensor(data, c->type);
+}
+EXPORT_SYMBOL(ssp_common_buffer_predisable);
+
+/**
+ * ssp_common_setup_buffer() - creates iio kfifo and registers the buffer for device
+ *
+ * @indio_dev: iio device
+ *
+ * Returns 0 or negative value in case of error
+ */
+int ssp_common_setup_buffer(struct iio_dev *indio_dev,
+ const struct iio_buffer_setup_ops *ops)
+{
+ int ret;
+ struct iio_buffer *buffer;
+
+ buffer = iio_kfifo_allocate(indio_dev);
+ if (!buffer)
+ return -ENOMEM;
+
+ iio_device_attach_buffer(indio_dev, buffer);
+
+ indio_dev->setup_ops = ops;
+
+ ret = iio_buffer_register(indio_dev, indio_dev->channels,
+ indio_dev->num_channels);
+ if (ret)
+ iio_kfifo_free(buffer);
+
+ return ret;
+}
+EXPORT_SYMBOL(ssp_common_setup_buffer);
diff --git a/drivers/iio/common/ssp_sensors/ssp_iio_sensor.h b/drivers/iio/common/ssp_sensors/ssp_iio_sensor.h
new file mode 100644
index 0000000..bf4a6ad
--- /dev/null
+++ b/drivers/iio/common/ssp_sensors/ssp_iio_sensor.h
@@ -0,0 +1,59 @@
+#ifndef __SSP_IIO_SENSOR_H__
+#define __SSP_IIO_SENSOR_H__
+
+#define SSP_CHANNEL_AG(_type, _mod, _index) \
+{ \
+ .type = _type,\
+ .modified = 1,\
+ .channel2 = _mod,\
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ),\
+ .scan_index = _index,\
+ .scan_type = {\
+ .sign = 's',\
+ .realbits = 16,\
+ .storagebits = 16,\
+ .shift = 0,\
+ .endianness = IIO_LE,\
+ },\
+}
+
+#define SSP_DIVISOR 1000000ULL
+#define SSP_MS_PER_S 1000
+#define SSP_DIVIDEND (SSP_DIVISOR * SSP_MS_PER_S)
+
+int ssp_common_buffer_postenable(struct iio_dev *indio_dev);
+
+int ssp_common_buffer_predisable(struct iio_dev *indio_dev);
+
+int ssp_common_setup_buffer(struct iio_dev *indio_dev,
+ const struct iio_buffer_setup_ops *ops);
+
+/* Converts time in ms to frequency */
+static inline void ssp_convert_to_freq(u32 time, int *integer_part,
+ int *fractional)
+{
+ unsigned int value;
+
+ if (time == 0) {
+ *fractional = 0;
+ *integer_part = 0;
+ return;
+ }
+
+ value = SSP_DIVIDEND / time;
+ *fractional = value % SSP_DIVISOR;
+ *integer_part = value / SSP_DIVISOR;
+}
+
+/* Converts frequency to time in ms*/
+static inline int ssp_convert_to_time(int integer_part, int fractional)
+{
+ u64 value;
+
+ value = integer_part * SSP_DIVISOR + fractional;
+ if (value == 0)
+ return 0;
+
+ return div_u64(SSP_DIVIDEND, value);
+}
+#endif /* __SSP_IIO_SENSOR_H__ */
--
1.7.9.5


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