This patch adds gyroscope iio driver which uses sensorhub as data
provider.
Signed-off-by: Karol Wrona <k.wrona@xxxxxxxxxxx>
Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
drivers/iio/gyro/Makefile | 2 +
drivers/iio/gyro/ssp_gyro_sensor.c | 222 ++++++++++++++++++++++++++++++++++++
2 files changed, 224 insertions(+)
create mode 100644 drivers/iio/gyro/ssp_gyro_sensor.c
diff --git a/drivers/iio/gyro/Makefile b/drivers/iio/gyro/Makefile
index 36a3877..a50ff87 100644
--- a/drivers/iio/gyro/Makefile
+++ b/drivers/iio/gyro/Makefile
@@ -22,3 +22,5 @@ st_gyro-$(CONFIG_IIO_BUFFER) += st_gyro_buffer.o
obj-$(CONFIG_IIO_ST_GYRO_I2C_3AXIS) += st_gyro_i2c.o
obj-$(CONFIG_IIO_ST_GYRO_SPI_3AXIS) += st_gyro_spi.o
+
+obj-$(CONFIG_SSP_SENSOR_IIO) += ssp_gyro_sensor.o
diff --git a/drivers/iio/gyro/ssp_gyro_sensor.c b/drivers/iio/gyro/ssp_gyro_sensor.c
new file mode 100644
index 0000000..d4499db
--- /dev/null
+++ b/drivers/iio/gyro/ssp_gyro_sensor.c
@@ -0,0 +1,222 @@
+/*
+ * 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 CHANNEL_COUNT 3
+
+#define SSP_GYROSCOPE_NAME "ssp-gyroscope"
+static const char ssp_gyro_name[] = SSP_GYROSCOPE_NAME;
+
+enum gyro_3d_channel {
+ CHANNEL_SCAN_INDEX_X,
+ CHANNEL_SCAN_INDEX_Y,
+ CHANNEL_SCAN_INDEX_Z,
+ CHANNEL_SCAN_INDEX_TIME,
+ GYRO_3D_CHANNEL_MAX,
+};
+
+static int gyro_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ int *val2,
+ long mask)
+{
+ int ret;
+ 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_GYROSCOPE_SENSOR);
+ ssp_convert_to_freq(t, val, val2);
+ ret = IIO_VAL_INT_PLUS_MICRO;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static int gyro_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val,
+ int val2,
+ long mask)
+{
+ int ret, value;
+ struct ssp_data *data = dev_get_drvdata(indio_dev->dev.parent->parent);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ value = ssp_convert_to_time(val, val2);
+ ret = ssp_change_delay(data, SSP_GYROSCOPE_SENSOR, value);
+ if (ret < 0) {
+ dev_err(&indio_dev->dev, "gyro sensor enable fail\n");
+ ret = -EINVAL;
+ }
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static struct iio_info ssp_gyro_iio_info = {
+ .read_raw = &gyro_read_raw,
+ .write_raw = &gyro_write_raw,
+};
+
+static const struct iio_chan_spec gyro_channels[] = {
+ SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_X, CHANNEL_SCAN_INDEX_X),
+ SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_Y, CHANNEL_SCAN_INDEX_Y),
+ SSP_CHANNEL_AG(IIO_ANGL_VEL, IIO_MOD_Z, CHANNEL_SCAN_INDEX_Z),
+ IIO_CHAN_SOFT_TIMESTAMP(CHANNEL_SCAN_INDEX_TIME),
+};
+
+static int process_gyro_data(struct iio_dev *indio_dev, void *buf,
+ int64_t timestamp)
+{
+ __le32 time = 0;
+ const int len = SSP_GYROSCOPE_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 int ssp_gyro_remove(struct platform_device *pdev)
+{
+ struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+
+ iio_buffer_unregister(indio_dev);
+ iio_kfifo_free(indio_dev->buffer);
+ iio_device_unregister(indio_dev);
+ iio_device_free(indio_dev);
+
+ return 0;
+}
+
+static const struct iio_buffer_setup_ops gyro_buffer_ops = {
+ .postenable = &ssp_common_buffer_postenable,
+ .predisable = &ssp_common_buffer_predisable,
+};
+
+static int ssp_gyro_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+ struct iio_dev *indio_dev;
+ struct ssp_sensor_data *spd;
+
+ indio_dev = iio_device_alloc(sizeof(*spd));
+ if (IS_ERR(indio_dev)) {
+ dev_err(&pdev->dev, "device alloc fail\n");
+ return PTR_ERR(indio_dev);
+ }
+
+ spd = iio_priv(indio_dev);
+
+ spd->process_data = process_gyro_data;
+ spd->type = SSP_GYROSCOPE_SENSOR;
+
+ indio_dev->name = ssp_gyro_name;
+ indio_dev->dev.parent = &pdev->dev;
+ indio_dev->info = &ssp_gyro_iio_info;
+
+ if (indio_dev->info == NULL)
+ goto err_iio_alloc;
+
+ indio_dev->modes = INDIO_BUFFER_HARDWARE;
+ indio_dev->channels = gyro_channels;
+ indio_dev->num_channels = ARRAY_SIZE(gyro_channels);
+
+ ret = ssp_common_setup_buffer(indio_dev, &gyro_buffer_ops);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Buffer setup fail\n");
+ goto err_iio_alloc;
+ }
+
+ ret = iio_device_register(indio_dev);
+ if (ret < 0)
+ goto err_iio_buffer;
+
+ platform_set_drvdata(pdev, indio_dev);
+
+ ssp_register_consumer(indio_dev, SSP_GYROSCOPE_SENSOR);
+
+ return 0;
+
+err_iio_buffer:
+ iio_buffer_unregister(indio_dev);
+ iio_kfifo_free(indio_dev->buffer);
+err_iio_alloc:
+ iio_device_free(indio_dev);
+
+ return ret;
+}
+
+static const struct of_device_id ssp_gyro_id_table[] = {
+ {
+ .compatible = "samsung,mpu6500-gyro",
+ },
+ {},
+};
+
+static struct platform_driver ssp_gyro_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = SSP_GYROSCOPE_NAME,
+ .of_match_table = ssp_gyro_id_table,
+ },
+ .probe = ssp_gyro_probe,
+ .remove = ssp_gyro_remove,
+};
+
+module_platform_driver(ssp_gyro_driver);
+
+MODULE_AUTHOR("Karol Wrona <k.wrona@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("Samsung sensorhub gyroscopes driver");
+MODULE_LICENSE("GPL");
--
1.7.9.5
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