diff options
Diffstat (limited to 'drivers/iio/accel/ssp_accel_sensor.c')
| -rw-r--r-- | drivers/iio/accel/ssp_accel_sensor.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/drivers/iio/accel/ssp_accel_sensor.c b/drivers/iio/accel/ssp_accel_sensor.c new file mode 100644 index 000000000..dd6ece8f9 --- /dev/null +++ b/drivers/iio/accel/ssp_accel_sensor.c @@ -0,0 +1,160 @@ +/* + * 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/buffer.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, +}; + +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 const struct iio_info ssp_accel_iio_info = { + .read_raw = &ssp_accel_read_raw, + .write_raw = &ssp_accel_write_raw, +}; + +static const unsigned long ssp_accel_scan_mask[] = { 0x7, 0, }; + +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), + SSP_CHAN_TIMESTAMP(SSP_CHANNEL_SCAN_INDEX_TIME), +}; + +static int ssp_process_accel_data(struct iio_dev *indio_dev, void *buf, + int64_t timestamp) +{ + return ssp_common_process_data(indio_dev, buf, SSP_ACCELEROMETER_SIZE, + timestamp); +} + +static const struct iio_buffer_setup_ops ssp_accel_buffer_ops = { + .postenable = &ssp_common_buffer_postenable, + .postdisable = &ssp_common_buffer_postdisable, +}; + +static int ssp_accel_probe(struct platform_device *pdev) +{ + int ret; + struct iio_dev *indio_dev; + struct ssp_sensor_data *spd; + struct iio_buffer *buffer; + + 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_SOFTWARE; + indio_dev->channels = ssp_acc_channels; + indio_dev->num_channels = ARRAY_SIZE(ssp_acc_channels); + indio_dev->available_scan_masks = ssp_accel_scan_mask; + + buffer = devm_iio_kfifo_allocate(&pdev->dev); + if (!buffer) + return -ENOMEM; + + iio_device_attach_buffer(indio_dev, buffer); + + indio_dev->setup_ops = &ssp_accel_buffer_ops; + + platform_set_drvdata(pdev, indio_dev); + + ret = devm_iio_device_register(&pdev->dev, indio_dev); + if (ret < 0) + return ret; + + /* ssp registering should be done after all iio setup */ + ssp_register_consumer(indio_dev, SSP_ACCELEROMETER_SENSOR); + + return 0; +} + +static struct platform_driver ssp_accel_driver = { + .driver = { + .name = SSP_ACCEL_NAME, + }, + .probe = ssp_accel_probe, +}; + +module_platform_driver(ssp_accel_driver); + +MODULE_AUTHOR("Karol Wrona <k.wrona@samsung.com>"); +MODULE_DESCRIPTION("Samsung sensorhub accelerometers driver"); +MODULE_LICENSE("GPL"); |