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Date: Wed, 03 Sep 2014 16:55:48 +0200
From: Karol Wrona <k.wrona@...sung.com>
To: Jonathan Cameron <jic23@...nel.org>, linux-iio@...r.kernel.org,
Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
Kyungmin Park <kyungmin.park@...sung.com>,
Karol Wrona <k.wrona@...sung.com>
Subject: [RFC/PATCH 4/6] iio: sensorhub: Add sensorhub iio commons
This patch adds common library and trigger module for sensorhub iio drivers.
Signed-off-by: Karol Wrona <k.wrona@...sung.com>
Acked-by: Kyungmin Park <kyungmin.park@...sung.com>
---
drivers/iio/common/Kconfig | 1 +
drivers/iio/common/Makefile | 1 +
drivers/iio/common/ssp_sensors/Kconfig | 15 ++++
drivers/iio/common/ssp_sensors/Makefile | 6 ++
.../iio/common/ssp_sensors/ssp-sensor-trigger.c | 92 ++++++++++++++++++++
drivers/iio/common/ssp_sensors/ssp_iio.c | 35 ++++++++
drivers/iio/common/ssp_sensors/ssp_iio_sensor.h | 62 +++++++++++++
7 files changed, 212 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-sensor-trigger.c
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..eefabdb
--- /dev/null
+++ b/drivers/iio/common/ssp_sensors/Kconfig
@@ -0,0 +1,15 @@
+#
+# Hid Sensor common modules
+#
+menu "SSP Sensor IIO Common"
+
+config SSP_SENSOR_IIO
+ tristate "Common module (trigger) for all SSP Sensor IIO drivers"
+ depends on SENSORS_SSP
+ select IIO_TRIGGER
+ select IIO_TRIGGERED_BUFFER
+ help
+ Say yes here to build trigger support for SSP sensors.
+ Triggers will be send if all requested attributes were read.
+
+endmenu
diff --git a/drivers/iio/common/ssp_sensors/Makefile b/drivers/iio/common/ssp_sensors/Makefile
new file mode 100644
index 0000000..da47549
--- /dev/null
+++ b/drivers/iio/common/ssp_sensors/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for the SSP sensor common modules.
+#
+
+obj-$(CONFIG_SSP_SENSOR_IIO) += ssp-sensor-trigger.o
+obj-$(CONFIG_SSP_SENSOR_IIO) += ssp_iio.o
diff --git a/drivers/iio/common/ssp_sensors/ssp-sensor-trigger.c b/drivers/iio/common/ssp_sensors/ssp-sensor-trigger.c
new file mode 100644
index 0000000..0783cca
--- /dev/null
+++ b/drivers/iio/common/ssp_sensors/ssp-sensor-trigger.c
@@ -0,0 +1,92 @@
+/*
+ * 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/device.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/kfifo_buf.h>
+#include <linux/iio/common/ssp_sensors.h>
+#include "ssp_iio_sensor.h"
+
+static int set_rdy_trigger_state(struct iio_trigger *trigger, bool state)
+{
+ int ret = 0;
+ struct ssp_sensor_data *c = iio_trigger_get_drvdata(trigger);
+ struct ssp_data *data = dev_get_drvdata(trigger->dev.parent->parent);
+
+ if (state)
+ ret = ssp_enable_sensor(data, c->type,
+ ssp_get_sensor_delay(data,
+ c->type));
+ else
+ ret = ssp_disable_sensor(data, c->type);
+
+ return ret;
+}
+
+static struct iio_trigger_ops ssp_sensor_trigger_ops = {
+ .owner = THIS_MODULE,
+ .set_trigger_state = set_rdy_trigger_state,
+};
+
+void ssp_sensor_remove_trigger(struct iio_dev *indio_dev)
+{
+ iio_trigger_unregister(indio_dev->trig);
+ iio_trigger_free(indio_dev->trig);
+ indio_dev->trig = NULL;
+}
+EXPORT_SYMBOL(ssp_sensor_remove_trigger);
+
+int ssp_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
+ struct ssp_sensor_data *sdata)
+{
+ int ret;
+ struct iio_trigger *trigger;
+
+ trigger = iio_trigger_alloc("%s-dev%d", name, indio_dev->id);
+ if (trigger == NULL) {
+ dev_err(&indio_dev->dev, "Trigger alloc failed\n");
+ return -ENOMEM;
+ }
+
+ trigger->dev.parent = indio_dev->dev.parent;
+ trigger->ops = &ssp_sensor_trigger_ops;
+ iio_trigger_set_drvdata(trigger, sdata);
+
+ ret = iio_trigger_register(trigger);
+ if (ret) {
+ dev_err(&indio_dev->dev, "Trigger register failed\n");
+ goto error_free;
+ }
+ indio_dev->trig = trigger;
+
+ return ret;
+
+error_free:
+ iio_trigger_free(trigger);
+ return ret;
+}
+EXPORT_SYMBOL(ssp_sensor_setup_trigger);
+
+MODULE_AUTHOR("Karol Wrona <k.wrona@...sung.com>");
+MODULE_DESCRIPTION("SSP Sensor trigger processing");
+MODULE_LICENSE("GPL");
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..fc88643
--- /dev/null
+++ b/drivers/iio/common/ssp_sensors/ssp_iio.c
@@ -0,0 +1,35 @@
+/*
+ * 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/iio.h>
+#include <linux/kernel.h>
+#include <linux/iio/common/ssp_sensors.h>
+#include <linux/iio/triggered_buffer.h>
+#include "ssp_iio_sensor.h"
+
+/**
+ * @ssp_common_destroy_sensor() - ssp sensor cleanup
+ *
+ * @indio_dev: iio device
+ */
+void ssp_common_destroy_sensor(struct iio_dev *indio_dev)
+{
+ iio_device_unregister(indio_dev);
+ ssp_sensor_remove_trigger(indio_dev);
+ iio_triggered_buffer_cleanup(indio_dev);
+ iio_device_free(indio_dev);
+
+}
+EXPORT_SYMBOL(ssp_common_destroy_sensor);
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..1911fbd
--- /dev/null
+++ b/drivers/iio/common/ssp_sensors/ssp_iio_sensor.h
@@ -0,0 +1,62 @@
+#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_separate = BIT(IIO_CHAN_INFO_RAW) |\
+ 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_sensor_setup_trigger(struct iio_dev *indio_dev, const char *name,
+ struct ssp_sensor_data *data);
+
+void ssp_sensor_remove_trigger(struct iio_dev *indio_dev);
+
+/* 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);
+}
+
+void ssp_common_destroy_sensor(struct iio_dev *indio_dev);
+
+#endif /* __SSP_IIO_SENSOR_H__ */
+
--
1.7.9.5
--
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