/*
* HID Sensors Driver
* Copyright (c) 2012, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#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/delay.h>
#include <linux/hid-sensor-hub.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include "../common/hid-sensors/hid-sensor-trigger.h"
enum magn_3d_channel {
CHANNEL_SCAN_INDEX_X,
CHANNEL_SCAN_INDEX_Y,
CHANNEL_SCAN_INDEX_Z,
MAGN_3D_CHANNEL_MAX,
};
struct magn_3d_state {
struct hid_sensor_hub_callbacks callbacks;
struct hid_sensor_common common_attributes;
struct hid_sensor_hub_attribute_info magn[MAGN_3D_CHANNEL_MAX];
u32 magn_val[MAGN_3D_CHANNEL_MAX];
int scale_pre_decml;
int scale_post_decml;
int scale_precision;
int value_offset;
};
static const u32 magn_3d_addresses[MAGN_3D_CHANNEL_MAX] = {
HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS,
HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Y_AXIS,
HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Z_AXIS
};
/* Channel definitions */
static const struct iio_chan_spec magn_3d_channels[] = {
{
.type = IIO_MAGN,
.modified = 1,
.channel2 = IIO_MOD_X,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_SAMP_FREQ) |
BIT(IIO_CHAN_INFO_HYSTERESIS),
.scan_index = CHANNEL_SCAN_INDEX_X,
}, {
.type = IIO_MAGN,
.modified = 1,
.channel2 = IIO_MOD_Y,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_SAMP_FREQ) |
BIT(IIO_CHAN_INFO_HYSTERESIS),
.scan_index = CHANNEL_SCAN_INDEX_Y,
}, {
.type = IIO_MAGN,
.modified = 1,
.channel2 = IIO_MOD_Z,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_SAMP_FREQ) |
BIT(IIO_CHAN_INFO_HYSTERESIS),
.scan_index = CHANNEL_SCAN_INDEX_Z,
}
};
/* Adjust channel real bits based on report descriptor */
static void magn_3d_adjust_channel_bit_mask(struct iio_chan_spec *channels,
int channel, int size)
{
channels[channel].scan_type.sign = 's';
/* Real storage bits will change based on the report desc. */
channels[channel].scan_type.realbits = size * 8;
/* Maximum size of a sample to capture is u32 */
channels[channel].scan_type.storagebits = sizeof(u32) * 8;
}
/* Channel read_raw handler */
static int magn_3d_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2,
long mask)
{
struct magn_3d_state *magn_state = iio_priv(indio_dev);
int report_id = -1;
u32 address;
int ret_type;
s32 poll_value;
*val = 0;
*val2 = 0;
switch (mask) {
case 0:
poll_value = hid_sensor_read_poll_value(
&magn_state->common_attributes);
if (poll_value < 0)
return -EINVAL;
hid_sensor_power_state(&magn_state->common_attributes, true);
msleep_interruptible(poll_value * 2);
report_id =
magn_state->magn[chan->scan_index].report_id;
address = magn_3d_addresses[chan->scan_index];
if (report_id >= 0)
*val = sensor_hub_input_attr_get_raw_value(
magn_state->common_attributes.hsdev,
HID_USAGE_SENSOR_COMPASS_3D, address,
report_id);
else {
*val = 0;
hid_sensor_power_state(&magn_state->common_attributes,
false);
return -EINVAL;
}
hid_sensor_power_state(&magn_state->common_attributes, false);
ret_type = IIO_VAL_INT;
break;
case IIO_CHAN_INFO_SCALE:
*val = magn_state->scale_pre_decml;
*val2 = magn_state->scale_post_decml;
ret_type = magn_state->scale_precision;
break;
case IIO_CHAN_INFO_OFFSET:
*val = magn_state->value_offset;
ret_type = IIO_VAL_INT;
break;
case IIO_CHAN_INFO_SAMP_FREQ:
ret_type = hid_sensor_read_samp_freq_value(
&magn_state->common_attributes, val, val2);
break;
case IIO_CHAN_INFO_HYSTERESIS:
ret_type = hid_sensor_read_raw_hyst_value(
&magn_state->common_attributes, val, val2);
break;
default:
ret_type = -EINVAL;
break;
}
return ret_type;
}
/* Channel write_raw handler */
static int magn_3d_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val,
int val2,
long mask)
{
struct magn_3d_state *magn_state = iio_priv(indio_dev);
int ret = 0;
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
ret = hid_sensor_write_samp_freq_value(
&magn_state->common_attributes, val, val2);
break;
case IIO_CHAN_INFO_HYSTERESIS:
ret = hid_sensor_write_raw_hyst_value(
&magn_state->common_attributes, val, val2);
break;
default:
ret = -EINVAL;
}
return ret;
}
static const struct iio_info magn_3d_info = {
.driver_module = THIS_MODULE,
.read_raw = &magn_3d_read_raw,
.write_raw = &magn_3d_write_raw,
};
/* Function to push data to buffer */
static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
int len)
{
dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
iio_push_to_buffers(indio_dev, data);
}
/* Callback handler to send event after all samples are received and captured */
static int magn_3d_proc_event(struct hid_sensor_hub_device *hsdev,
unsigned usage_id,
void *priv)
{
struct iio_dev *indio_dev = platform_get_drvdata(priv);
struct magn_3d_state *magn_state = iio_priv(indio_dev);
dev_dbg(&indio_dev->dev, "magn_3d_proc_event\n");
if (atomic_read(&magn_state->common_attributes.data_ready))
hid_sensor_push_data(indio_dev,
magn_state->magn_val,
sizeof(magn_state->magn_val));
return 0;
}
/* Capture samples in local storage */
static int magn_3d_capture_sample(struct hid_sensor_hub_device *hsdev,
unsigned usage_id,
size_t raw_len, char *raw_data,
void *priv)
{
struct iio_dev *indio_dev = platform_get_drvdata(priv);
struct magn_3d_state *magn_state = iio_priv(indio_dev);
int offset;
int ret = -EINVAL;
switch (usage_id) {
case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS:
case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Y_AXIS:
case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Z_AXIS:
offset = usage_id - HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS;
magn_state->magn_val[CHANNEL_SCAN_INDEX_X + offset] =
*(u32 *)raw_data;
ret = 0;
break;
default:
break;
}
return ret;
}
/* Parse report which is specific to an usage id*/
static int magn_3d_parse_report(struct platform_device *pdev,
struct hid_sensor_hub_device *hsdev,
struct iio_chan_spec *channels,
unsigned usage_id,
struct magn_3d_state *st)
{
int ret;
int i;
for (i = 0; i <= CHANNEL_SCAN_INDEX_Z; ++i) {
ret = sensor_hub_input_get_attribute_info(hsdev,
HID_INPUT_REPORT,
usage_id,
HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS + i,
&st->magn[CHANNEL_SCAN_INDEX_X + i]);
if (ret < 0)
break;
magn_3d_adjust_channel_bit_mask(channels,
CHANNEL_SCAN_INDEX_X + i,
st->magn[CHANNEL_SCAN_INDEX_X + i].size);
}
dev_dbg(&pdev->dev, "magn_3d %x:%x, %x:%x, %x:%x\n",
st->magn[0].index,
st->magn[0].report_id,
st->magn[1].index, st->magn[1].report_id,
st->magn[2].index, st->magn[2].report_id);
st->scale_precision = hid_sensor_format_scale(
HID_USAGE_SENSOR_COMPASS_3D,
&st->magn[CHANNEL_SCAN_INDEX_X],
&st->scale_pre_decml, &st->scale_post_decml);
/* Set Sensitivity field ids, when there is no individual modifier */
if (st->common_attributes.sensitivity.index < 0) {
sensor_hub_input_get_attribute_info(hsdev,
HID_FEATURE_REPORT, usage_id,
HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
HID_USAGE_SENSOR_DATA_ORIENTATION,
&st->common_attributes.sensitivity);
dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
st->common_attributes.sensitivity.index,
st->common_attributes.sensitivity.report_id);
}
return ret;
}
/* Function to initialize the processing for usage id */
static int hid_magn_3d_probe(struct platform_device *pdev)
{
int ret = 0;
static char *name = "magn_3d";
struct iio_dev *indio_dev;
struct magn_3d_state *magn_state;
struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
struct iio_chan_spec *channels;
indio_dev = devm_iio_device_alloc(&pdev->dev,
sizeof(struct magn_3d_state));
if (indio_dev == NULL)
return -ENOMEM;
platform_set_drvdata(pdev, indio_dev);
magn_state = iio_priv(indio_dev);
magn_state->common_attributes.hsdev = hsdev;
magn_state->common_attributes.pdev = pdev;
ret = hid_sensor_parse_common_attributes(hsdev,
HID_USAGE_SENSOR_COMPASS_3D,
&magn_state->common_attributes);
if (ret) {
dev_err(&pdev->dev, "failed to setup common attributes\n");
return ret;
}
channels = kmemdup(magn_3d_channels, sizeof(magn_3d_channels),
GFP_KERNEL);
if (!channels) {
dev_err(&pdev->dev, "failed to duplicate channels\n");
return -ENOMEM;
}
ret = magn_3d_parse_report(pdev, hsdev, channels,
HID_USAGE_SENSOR_COMPASS_3D, magn_state);
if (ret) {
dev_err(&pdev->dev, "failed to setup attributes\n");
goto error_free_dev_mem;
}
indio_dev->channels = channels;
indio_dev->num_channels = ARRAY_SIZE(magn_3d_channels);
indio_dev->dev.parent = &pdev->dev;
indio_dev->info = &magn_3d_info;
indio_dev->name = name;
indio_dev->modes = INDIO_DIRECT_MODE;
ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
NULL, NULL);
if (ret) {
dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
goto error_free_dev_mem;
}
atomic_set(&magn_state->common_attributes.data_ready, 0);
ret = hid_sensor_setup_trigger(indio_dev, name,
&magn_state->common_attributes);
if (ret < 0) {
dev_err(&pdev->dev, "trigger setup failed\n");
goto error_unreg_buffer_funcs;
}
ret = iio_device_register(indio_dev);
if (ret) {
dev_err(&pdev->dev, "device register failed\n");
goto error_remove_trigger;
}
magn_state->callbacks.send_event = magn_3d_proc_event;
magn_state->callbacks.capture_sample = magn_3d_capture_sample;
magn_state->callbacks.pdev = pdev;
ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_COMPASS_3D,
&magn_state->callbacks);
if (ret < 0) {
dev_err(&pdev->dev, "callback reg failed\n");
goto error_iio_unreg;
}
return ret;
error_iio_unreg:
iio_device_unregister(indio_dev);
error_remove_trigger:
hid_sensor_remove_trigger(&magn_state->common_attributes);
error_unreg_buffer_funcs:
iio_triggered_buffer_cleanup(indio_dev);
error_free_dev_mem:
kfree(indio_dev->channels);
return ret;
}
/* Function to deinitialize the processing for usage id */
static int hid_magn_3d_remove(struct platform_device *pdev)
{
struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
struct iio_dev *indio_dev = platform_get_drvdata(pdev);
struct magn_3d_state *magn_state = iio_priv(indio_dev);
sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_COMPASS_3D);
iio_device_unregister(indio_dev);
hid_sensor_remove_trigger(&magn_state->common_attributes);
iio_triggered_buffer_cleanup(indio_dev);
kfree(indio_dev->channels);
return 0;
}
static struct platform_device_id hid_magn_3d_ids[] = {
{
/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
.name = "HID-SENSOR-200083",
},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, hid_magn_3d_ids);
static struct platform_driver hid_magn_3d_platform_driver = {
.id_table = hid_magn_3d_ids,
.driver = {
.name = KBUILD_MODNAME,
.owner = THIS_MODULE,
},
.probe = hid_magn_3d_probe,
.remove = hid_magn_3d_remove,
};
module_platform_driver(hid_magn_3d_platform_driver);
MODULE_DESCRIPTION("HID Sensor Magnetometer 3D");
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
MODULE_LICENSE("GPL");