This patch adds accelerometer iio driver which uses sensorhub as data
provider.
Change-Id: I4686741b7401ec5cbf4b5d0f2a5cc146fbe24d53
Signed-off-by: Karol Wrona <k.wrona@xxxxxxxxxxx>
Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
drivers/iio/accel/Makefile | 1 +
drivers/iio/accel/ssp_accel_sensor.c | 203 ++++++++++++++++++++++++++++++++++
2 files changed, 204 insertions(+)
create mode 100644 drivers/iio/accel/ssp_accel_sensor.c
diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
index a593996..df6a0b2 100644
--- a/drivers/iio/accel/Makefile
+++ b/drivers/iio/accel/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_HID_SENSOR_ACCEL_3D) += hid-sensor-accel-3d.o
obj-$(CONFIG_KXCJK1013) += kxcjk-1013.o
obj-$(CONFIG_KXSD9) += kxsd9.o
obj-$(CONFIG_MMA8452) += mma8452.o
+obj-$(CONFIG_IIO_SSP_SENSOR) += ssp_accel_sensor.o
obj-$(CONFIG_IIO_ST_ACCEL_3AXIS) += st_accel.o
st_accel-y := st_accel_core.o
diff --git a/drivers/iio/accel/ssp_accel_sensor.c b/drivers/iio/accel/ssp_accel_sensor.c
new file mode 100644
index 0000000..0a47c29
--- /dev/null
+++ b/drivers/iio/accel/ssp_accel_sensor.c
@@ -0,0 +1,203 @@
+/*
+ * 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/iio.h>
+#include <linux/iio/kfifo_buf.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include "../common/ssp_sensors/ssp_iio_sensor.h"
+
+#define SSP_CHANNEL_COUNT 3
+
+#define SSP_ACCEL_NAME "ssp-accelerometer"
+static const char ssp_accel_device_name[] = SSP_ACCEL_NAME;
+
+enum ssp_accel_3d_channel {
+ SSP_CHANNEL_SCAN_INDEX_X,
+ SSP_CHANNEL_SCAN_INDEX_Y,
+ SSP_CHANNEL_SCAN_INDEX_Z,
+ SSP_CHANNEL_SCAN_INDEX_TIME,
+ SSP_ACCEL_3D_CHANNEL_MAX,
+};
+
+static int ssp_accel_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int *val,
+ int *val2, long mask)
+{
+ u32 t;
+ struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ t = ssp_get_sensor_delay(data, SSP_ACCELEROMETER_SENSOR);
+ ssp_convert_to_freq(t, val, val2);
+ return IIO_VAL_INT_PLUS_MICRO;
+ default:
+ break;
+ }
+
+ return -EINVAL;
+}
+
+static int ssp_accel_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int val,
+ int val2, long mask)
+{
+ int ret;
+ struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ ret = ssp_convert_to_time(val, val2);
+ ret = ssp_change_delay(data, SSP_ACCELEROMETER_SENSOR, ret);
+ if (ret < 0)
+ dev_err(&indio_dev->dev, "accel sensor enable fail\n");
+
+ return ret;
+ default:
+ break;
+ }
+
+ return -EINVAL;
+}
+
+static struct iio_info ssp_accel_iio_info = {
+ .read_raw = &ssp_accel_read_raw,
+ .write_raw = &ssp_accel_write_raw,
+};
+
+static const struct iio_chan_spec ssp_acc_channels[] = {
+ SSP_CHANNEL_AG(IIO_ACCEL, IIO_MOD_X, SSP_CHANNEL_SCAN_INDEX_X),
+ SSP_CHANNEL_AG(IIO_ACCEL, IIO_MOD_Y, SSP_CHANNEL_SCAN_INDEX_Y),
+ SSP_CHANNEL_AG(IIO_ACCEL, IIO_MOD_Z, SSP_CHANNEL_SCAN_INDEX_Z),
+ IIO_CHAN_SOFT_TIMESTAMP(SSP_CHANNEL_SCAN_INDEX_TIME),
+};
+
+static int ssp_process_accel_data(struct iio_dev *indio_dev, void *buf,
+ int64_t timestamp)
+{
+ __le32 time;
+ const int len = SSP_ACCELEROMETER_SIZE;
+ int64_t calculated_time;
+ char *data;
+ int ret;
+
+ if (indio_dev->scan_bytes == 0)
+ return 0;
+
+ data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ memcpy(data, buf, len);
+
+ if (indio_dev->scan_timestamp) {
+ memcpy(&time, &((char *)buf)[len], SSP_TIME_SIZE);
+ calculated_time =
+ timestamp + (int64_t)le32_to_cpu(time) * 1000000;
+ }
+
+ ret = iio_push_to_buffers_with_timestamp(indio_dev, data,
+ calculated_time);
+
+ kfree(data);
+
+ return ret;
+}
+
+static const struct iio_buffer_setup_ops ssp_accel_buffer_ops = {
+ .postenable = &ssp_common_buffer_postenable,
+ .predisable = &ssp_common_buffer_predisable,
+};
+
+static int ssp_accel_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct iio_dev *indio_dev;
+ struct ssp_sensor_data *spd;
+
+ indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*spd));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ spd = iio_priv(indio_dev);
+
+ spd->process_data = ssp_process_accel_data;
+ spd->type = SSP_ACCELEROMETER_SENSOR;
+
+ indio_dev->name = ssp_accel_device_name;
+ indio_dev->dev.parent = &pdev->dev;
+ indio_dev->dev.of_node = pdev->dev.of_node;
+ indio_dev->info = &ssp_accel_iio_info;
+ indio_dev->modes = INDIO_BUFFER_HARDWARE;
+ indio_dev->channels = ssp_acc_channels;
+ indio_dev->num_channels = ARRAY_SIZE(ssp_acc_channels);
+
+ ret = ssp_common_setup_buffer(indio_dev, &ssp_accel_buffer_ops);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Buffer setup fail\n");
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, indio_dev);
+
+ ret = iio_device_register(indio_dev);
+ if (ret < 0) {
+ iio_buffer_unregister(indio_dev);
+ iio_kfifo_free(indio_dev->buffer);
+ return ret;
+ }
+
+ /* need to be really sure about success for this one */
+ ssp_register_consumer(indio_dev, SSP_ACCELEROMETER_SENSOR);
+
+ return 0;
+}
+
+static int ssp_accel_remove(struct platform_device *pdev)
+{
+ struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+
+ iio_device_unregister(indio_dev);
+ iio_buffer_unregister(indio_dev);
+ iio_kfifo_free(indio_dev->buffer);
+
+ return 0;
+}
+
+static const struct of_device_id ssp_accel_id_table[] = {
+ {
+ .compatible = "samsung,mpu6500-accel",
+ },
+ {},
+};
+
+static struct platform_driver ssp_accel_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = SSP_ACCEL_NAME,
+ .of_match_table = ssp_accel_id_table,
+ },
+ .probe = ssp_accel_probe,
+ .remove = ssp_accel_remove,
+};
+
+module_platform_driver(ssp_accel_driver);
+
+MODULE_AUTHOR("Karol Wrona <k.wrona@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("Samsung sensorhub accelerometers driver");
+MODULE_LICENSE("GPL");
--
1.7.9.5
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