/* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include "../common/hid-sensors/hid-sensor-trigger.h" enum { CHANNEL_SCAN_INDEX_INTENSITY = 0, CHANNEL_SCAN_INDEX_ILLUM = 1, CHANNEL_SCAN_INDEX_MAX }; struct als_state { struct hid_sensor_hub_callbacks callbacks; struct hid_sensor_common common_attributes; struct hid_sensor_hub_attribute_info als_illum; u32 illum[CHANNEL_SCAN_INDEX_MAX]; int scale_pre_decml; int scale_post_decml; int scale_precision; int value_offset; }; /* Channel definitions */ static const struct iio_chan_spec als_channels[] = { { .type = IIO_INTENSITY, .modified = 1, .channel2 = IIO_MOD_LIGHT_BOTH, .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_INTENSITY, }, { .type = IIO_LIGHT, .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_ILLUM, } }; /* Adjust channel real bits based on report descriptor */ static void als_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 als_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { struct als_state *als_state = iio_priv(indio_dev); int report_id = -1; u32 address; int ret_type; s32 min; *val = 0; *val2 = 0; switch (mask) { case IIO_CHAN_INFO_RAW: switch (chan->scan_index) { case CHANNEL_SCAN_INDEX_INTENSITY: case CHANNEL_SCAN_INDEX_ILLUM: report_id = als_state->als_illum.report_id; min = als_state->als_illum.logical_minimum; address = HID_USAGE_SENSOR_LIGHT_ILLUM; break; default: report_id = -1; break; } if (report_id >= 0) { hid_sensor_power_state(&als_state->common_attributes, true); *val = sensor_hub_input_attr_get_raw_value( als_state->common_attributes.hsdev, HID_USAGE_SENSOR_ALS, address, report_id, SENSOR_HUB_SYNC, min < 0); hid_sensor_power_state(&als_state->common_attributes, false); } else { *val = 0; return -EINVAL; } ret_type = IIO_VAL_INT; break; case IIO_CHAN_INFO_SCALE: *val = als_state->scale_pre_decml; *val2 = als_state->scale_post_decml; ret_type = als_state->scale_precision; break; case IIO_CHAN_INFO_OFFSET: *val = als_state->value_offset; ret_type = IIO_VAL_INT; break; case IIO_CHAN_INFO_SAMP_FREQ: ret_type = hid_sensor_read_samp_freq_value( &als_state->common_attributes, val, val2); break; case IIO_CHAN_INFO_HYSTERESIS: ret_type = hid_sensor_read_raw_hyst_value( &als_state->common_attributes, val, val2); break; default: ret_type = -EINVAL; break; } return ret_type; } /* Channel write_raw handler */ static int als_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { struct als_state *als_state = iio_priv(indio_dev); int ret = 0; switch (mask) { case IIO_CHAN_INFO_SAMP_FREQ: ret = hid_sensor_write_samp_freq_value( &als_state->common_attributes, val, val2); break; case IIO_CHAN_INFO_HYSTERESIS: ret = hid_sensor_write_raw_hyst_value( &als_state->common_attributes, val, val2); break; default: ret = -EINVAL; } return ret; } static const struct iio_info als_info = { .read_raw = &als_read_raw, .write_raw = &als_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 als_proc_event(struct hid_sensor_hub_device *hsdev, unsigned usage_id, void *priv) { struct iio_dev *indio_dev = platform_get_drvdata(priv); struct als_state *als_state = iio_priv(indio_dev); dev_dbg(&indio_dev->dev, "als_proc_event\n"); if (atomic_read(&als_state->common_attributes.data_ready)) hid_sensor_push_data(indio_dev, &als_state->illum, sizeof(als_state->illum)); return 0; } /* Capture samples in local storage */ static int als_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 als_state *als_state = iio_priv(indio_dev); int ret = -EINVAL; u32 sample_data = *(u32 *)raw_data; switch (usage_id) { case HID_USAGE_SENSOR_LIGHT_ILLUM: als_state->illum[CHANNEL_SCAN_INDEX_INTENSITY] = sample_data; als_state->illum[CHANNEL_SCAN_INDEX_ILLUM] = sample_data; ret = 0; break; default: break; } return ret; } /* Parse report which is specific to an usage id*/ static int als_parse_report(struct platform_device *pdev, struct hid_sensor_hub_device *hsdev, struct iio_chan_spec *channels, unsigned usage_id, struct als_state *st) { int ret; ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT, usage_id, HID_USAGE_SENSOR_LIGHT_ILLUM, &st->als_illum); if (ret < 0) return ret; als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_INTENSITY, st->als_illum.size); als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_ILLUM, st->als_illum.size); dev_dbg(&pdev->dev, "als %x:%x\n", st->als_illum.index, st->als_illum.report_id); st->scale_precision = hid_sensor_format_scale( HID_USAGE_SENSOR_ALS, &st->als_illum, &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_LIGHT, &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_als_probe(struct platform_device *pdev) { int ret = 0; static const char *name = "als"; struct iio_dev *indio_dev; struct als_state *als_state; struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct als_state)); if (!indio_dev) return -ENOMEM; platform_set_drvdata(pdev, indio_dev); als_state = iio_priv(indio_dev); als_state->common_attributes.hsdev = hsdev; als_state->common_attributes.pdev = pdev; ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_ALS, &als_state->common_attributes); if (ret) { dev_err(&pdev->dev, "failed to setup common attributes\n"); return ret; } indio_dev->channels = kmemdup(als_channels, sizeof(als_channels), GFP_KERNEL); if (!indio_dev->channels) { dev_err(&pdev->dev, "failed to duplicate channels\n"); return -ENOMEM; } ret = als_parse_report(pdev, hsdev, (struct iio_chan_spec *)indio_dev->channels, HID_USAGE_SENSOR_ALS, als_state); if (ret) { dev_err(&pdev->dev, "failed to setup attributes\n"); goto error_free_dev_mem; } indio_dev->num_channels = ARRAY_SIZE(als_channels); indio_dev->dev.parent = &pdev->dev; indio_dev->info = &als_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(&als_state->common_attributes.data_ready, 0); ret = hid_sensor_setup_trigger(indio_dev, name, &als_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; } als_state->callbacks.send_event = als_proc_event; als_state->callbacks.capture_sample = als_capture_sample; als_state->callbacks.pdev = pdev; ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ALS, &als_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(&als_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_als_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 als_state *als_state = iio_priv(indio_dev); sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ALS); iio_device_unregister(indio_dev); hid_sensor_remove_trigger(&als_state->common_attributes); iio_triggered_buffer_cleanup(indio_dev); kfree(indio_dev->channels); return 0; } static const struct platform_device_id hid_als_ids[] = { { /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ .name = "HID-SENSOR-200041", }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(platform, hid_als_ids); static struct platform_driver hid_als_platform_driver = { .id_table = hid_als_ids, .driver = { .name = KBUILD_MODNAME, .pm = &hid_sensor_pm_ops, }, .probe = hid_als_probe, .remove = hid_als_remove, }; module_platform_driver(hid_als_platform_driver); MODULE_DESCRIPTION("HID Sensor ALS"); MODULE_AUTHOR("Srinivas Pandruvada "); MODULE_LICENSE("GPL");