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Release 4.8 drivers/iio/magnetometer/hid-sensor-magn-3d.c

/*
 * 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,
	
CHANNEL_SCAN_INDEX_NORTH_MAGN_TILT_COMP,
	
CHANNEL_SCAN_INDEX_NORTH_TRUE_TILT_COMP,
	
CHANNEL_SCAN_INDEX_NORTH_MAGN,
	
CHANNEL_SCAN_INDEX_NORTH_TRUE,
	
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];

	/* dynamically sized array to hold sensor values */
	
u32 *iio_vals;
	/* array of pointers to sensor value */
	
u32 *magn_val_addr[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,
	HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH,
	HID_USAGE_SENSOR_ORIENT_COMP_TRUE_NORTH,
	HID_USAGE_SENSOR_ORIENT_MAGN_NORTH,
	HID_USAGE_SENSOR_ORIENT_TRUE_NORTH,
};

/* 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),
        }, {
		.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),
        }, {
		.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),
        }, {
		.type = IIO_ROT,
		.modified = 1,
		.channel2 = IIO_MOD_NORTH_MAGN_TILT_COMP,
		.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),
        }, {
		.type = IIO_ROT,
		.modified = 1,
		.channel2 = IIO_MOD_NORTH_TRUE_TILT_COMP,
		.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),
        }, {
		.type = IIO_ROT,
		.modified = 1,
		.channel2 = IIO_MOD_NORTH_MAGN,
		.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),
        }, {
		.type = IIO_ROT,
		.modified = 1,
		.channel2 = IIO_MOD_NORTH_TRUE,
		.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),
        }
};

/* 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; }

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/* 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; *val = 0; *val2 = 0; switch (mask) { case 0: hid_sensor_power_state(&magn_state->common_attributes, true); report_id = magn_state->magn[chan->address].report_id; address = magn_3d_addresses[chan->address]; 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, SENSOR_HUB_SYNC); 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; }

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Total249100.00%6100.00%

/* 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; }

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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) { dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); iio_push_to_buffers(indio_dev, data); }

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Total33100.00%3100.00%

/* 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->iio_vals); return 0; }

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/* 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 = 0; u32 *iio_val = NULL; 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) + CHANNEL_SCAN_INDEX_X; break; case HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH: case HID_USAGE_SENSOR_ORIENT_COMP_TRUE_NORTH: case HID_USAGE_SENSOR_ORIENT_MAGN_NORTH: case HID_USAGE_SENSOR_ORIENT_TRUE_NORTH: offset = (usage_id - HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH) + CHANNEL_SCAN_INDEX_NORTH_MAGN_TILT_COMP; break; default: return -EINVAL; } iio_val = magn_state->magn_val_addr[offset]; if (iio_val != NULL) *iio_val = *((u32 *)raw_data); else ret = -EINVAL; return ret; }

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/* 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, int *chan_count, unsigned usage_id, struct magn_3d_state *st) { int i; int attr_count = 0; struct iio_chan_spec *_channels; /* Scan for each usage attribute supported */ for (i = 0; i < MAGN_3D_CHANNEL_MAX; i++) { int status; u32 address = magn_3d_addresses[i]; /* Check if usage attribute exists in the sensor hub device */ status = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT, usage_id, address, &(st->magn[i])); if (!status) attr_count++; } if (attr_count <= 0) { dev_err(&pdev->dev, "failed to find any supported usage attributes in report\n"); return -EINVAL; } dev_dbg(&pdev->dev, "magn_3d Found %d usage attributes\n", attr_count); dev_dbg(&pdev->dev, "magn_3d X: %x:%x Y: %x:%x Z: %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); /* Setup IIO channel array */ _channels = devm_kcalloc(&pdev->dev, attr_count, sizeof(struct iio_chan_spec), GFP_KERNEL); if (!_channels) { dev_err(&pdev->dev, "failed to allocate space for iio channels\n"); return -ENOMEM; } st->iio_vals = devm_kcalloc(&pdev->dev, attr_count, sizeof(u32), GFP_KERNEL); if (!st->iio_vals) { dev_err(&pdev->dev, "failed to allocate space for iio values array\n"); return -ENOMEM; } for (i = 0, *chan_count = 0; i < MAGN_3D_CHANNEL_MAX && *chan_count < attr_count; i++){ if (st->magn[i].index >= 0) { /* Setup IIO channel struct */ (_channels[*chan_count]) = magn_3d_channels[i]; (_channels[*chan_count]).scan_index = *chan_count; (_channels[*chan_count]).address = i; /* Set magn_val_addr to iio value address */ st->magn_val_addr[i] = &(st->iio_vals[*chan_count]); magn_3d_adjust_channel_bit_mask(_channels, *chan_count, st->magn[i].size); (*chan_count)++; } } if (*chan_count <= 0) { dev_err(&pdev->dev, "failed to find any magnetic channels setup\n"); return -EINVAL; } *channels = _channels; dev_dbg(&pdev->dev, "magn_3d Setup %d IIO channels\n", *chan_count); 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 0; }

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/* 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; int chan_count = 0; 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; } ret = magn_3d_parse_report(pdev, hsdev, &channels, &chan_count, HID_USAGE_SENSOR_COMPASS_3D, magn_state); if (ret) { dev_err(&pdev->dev, "failed to parse report\n"); return ret; } indio_dev->channels = channels; indio_dev->num_channels = chan_count; 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"); return ret; } 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); return ret; }

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/* 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); return 0; }

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static const 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, .pm = &hid_sensor_pm_ops, }, .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");

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alexander holleralexander holler341.49%211.11%
sachin kamatsachin kamat130.57%211.11%
lars-peter clausenlars-peter clausen20.09%15.56%
krzysztof kozlowskikrzysztof kozlowski10.04%15.56%
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