| /* |
| * 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/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-attributes.h" |
| #include "../common/hid-sensors/hid-sensor-trigger.h" |
| |
| /*Format: HID-SENSOR-usage_id_in_hex*/ |
| /*Usage ID from spec for Accelerometer-3D: 0x200073*/ |
| #define DRIVER_NAME "HID-SENSOR-200073" |
| |
| enum accel_3d_channel { |
| CHANNEL_SCAN_INDEX_X, |
| CHANNEL_SCAN_INDEX_Y, |
| CHANNEL_SCAN_INDEX_Z, |
| ACCEL_3D_CHANNEL_MAX, |
| }; |
| |
| struct accel_3d_state { |
| struct hid_sensor_hub_callbacks callbacks; |
| struct hid_sensor_iio_common common_attributes; |
| struct hid_sensor_hub_attribute_info accel[ACCEL_3D_CHANNEL_MAX]; |
| u32 accel_val[ACCEL_3D_CHANNEL_MAX]; |
| }; |
| |
| static const u32 accel_3d_addresses[ACCEL_3D_CHANNEL_MAX] = { |
| HID_USAGE_SENSOR_ACCEL_X_AXIS, |
| HID_USAGE_SENSOR_ACCEL_Y_AXIS, |
| HID_USAGE_SENSOR_ACCEL_Z_AXIS |
| }; |
| |
| /* Channel definitions */ |
| static const struct iio_chan_spec accel_3d_channels[] = { |
| { |
| .type = IIO_ACCEL, |
| .modified = 1, |
| .channel2 = IIO_MOD_X, |
| .info_mask = IIO_CHAN_INFO_OFFSET_SHARED_BIT | |
| IIO_CHAN_INFO_SCALE_SHARED_BIT | |
| IIO_CHAN_INFO_SAMP_FREQ_SHARED_BIT | |
| IIO_CHAN_INFO_HYSTERESIS_SHARED_BIT, |
| .scan_index = CHANNEL_SCAN_INDEX_X, |
| }, { |
| .type = IIO_ACCEL, |
| .modified = 1, |
| .channel2 = IIO_MOD_Y, |
| .info_mask = IIO_CHAN_INFO_OFFSET_SHARED_BIT | |
| IIO_CHAN_INFO_SCALE_SHARED_BIT | |
| IIO_CHAN_INFO_SAMP_FREQ_SHARED_BIT | |
| IIO_CHAN_INFO_HYSTERESIS_SHARED_BIT, |
| .scan_index = CHANNEL_SCAN_INDEX_Y, |
| }, { |
| .type = IIO_ACCEL, |
| .modified = 1, |
| .channel2 = IIO_MOD_Z, |
| .info_mask = IIO_CHAN_INFO_OFFSET_SHARED_BIT | |
| IIO_CHAN_INFO_SCALE_SHARED_BIT | |
| IIO_CHAN_INFO_SAMP_FREQ_SHARED_BIT | |
| IIO_CHAN_INFO_HYSTERESIS_SHARED_BIT, |
| .scan_index = CHANNEL_SCAN_INDEX_Z, |
| } |
| }; |
| |
| /* Adjust channel real bits based on report descriptor */ |
| static void accel_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 accel_3d_read_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int *val, int *val2, |
| long mask) |
| { |
| struct accel_3d_state *accel_state = iio_priv(indio_dev); |
| int report_id = -1; |
| u32 address; |
| int ret; |
| int ret_type; |
| |
| *val = 0; |
| *val2 = 0; |
| switch (mask) { |
| case 0: |
| report_id = accel_state->accel[chan->scan_index].report_id; |
| address = accel_3d_addresses[chan->scan_index]; |
| if (report_id >= 0) |
| *val = sensor_hub_input_attr_get_raw_value( |
| accel_state->common_attributes.hsdev, |
| HID_USAGE_SENSOR_ACCEL_3D, address, |
| report_id); |
| else { |
| *val = 0; |
| return -EINVAL; |
| } |
| ret_type = IIO_VAL_INT; |
| break; |
| case IIO_CHAN_INFO_SCALE: |
| *val = accel_state->accel[CHANNEL_SCAN_INDEX_X].units; |
| ret_type = IIO_VAL_INT; |
| break; |
| case IIO_CHAN_INFO_OFFSET: |
| *val = hid_sensor_convert_exponent( |
| accel_state->accel[CHANNEL_SCAN_INDEX_X].unit_expo); |
| ret_type = IIO_VAL_INT; |
| break; |
| case IIO_CHAN_INFO_SAMP_FREQ: |
| ret = hid_sensor_read_samp_freq_value( |
| &accel_state->common_attributes, val, val2); |
| ret_type = IIO_VAL_INT_PLUS_MICRO; |
| break; |
| case IIO_CHAN_INFO_HYSTERESIS: |
| ret = hid_sensor_read_raw_hyst_value( |
| &accel_state->common_attributes, val, val2); |
| ret_type = IIO_VAL_INT_PLUS_MICRO; |
| break; |
| default: |
| ret_type = -EINVAL; |
| break; |
| } |
| |
| return ret_type; |
| } |
| |
| /* Channel write_raw handler */ |
| static int accel_3d_write_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int val, |
| int val2, |
| long mask) |
| { |
| struct accel_3d_state *accel_state = iio_priv(indio_dev); |
| int ret = 0; |
| |
| switch (mask) { |
| case IIO_CHAN_INFO_SAMP_FREQ: |
| ret = hid_sensor_write_samp_freq_value( |
| &accel_state->common_attributes, val, val2); |
| break; |
| case IIO_CHAN_INFO_HYSTERESIS: |
| ret = hid_sensor_write_raw_hyst_value( |
| &accel_state->common_attributes, val, val2); |
| break; |
| default: |
| ret = -EINVAL; |
| } |
| |
| return ret; |
| } |
| |
| static int accel_3d_write_raw_get_fmt(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| long mask) |
| { |
| return IIO_VAL_INT_PLUS_MICRO; |
| } |
| |
| static const struct iio_info accel_3d_info = { |
| .driver_module = THIS_MODULE, |
| .read_raw = &accel_3d_read_raw, |
| .write_raw = &accel_3d_write_raw, |
| .write_raw_get_fmt = &accel_3d_write_raw_get_fmt, |
| }; |
| |
| /* Function to push data to buffer */ |
| static void hid_sensor_push_data(struct iio_dev *indio_dev, u8 *data, int len) |
| { |
| struct iio_buffer *buffer = indio_dev->buffer; |
| s64 timestamp = iio_get_time_ns(); |
| int datum_sz; |
| |
| dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); |
| if (!buffer) { |
| dev_err(&indio_dev->dev, "Buffer == NULL\n"); |
| return; |
| } |
| datum_sz = buffer->access->get_bytes_per_datum(buffer); |
| if (len > datum_sz) { |
| dev_err(&indio_dev->dev, "Datum size mismatch %d:%d\n", len, |
| datum_sz); |
| return; |
| } |
| iio_push_to_buffer(buffer, (u8 *)data, timestamp); |
| } |
| |
| /* Callback handler to send event after all samples are received and captured */ |
| static int accel_3d_proc_event(struct hid_sensor_hub_device *hsdev, |
| unsigned usage_id, |
| void *priv) |
| { |
| struct iio_dev *indio_dev = platform_get_drvdata(priv); |
| struct accel_3d_state *accel_state = iio_priv(indio_dev); |
| |
| dev_dbg(&indio_dev->dev, "accel_3d_proc_event [%d]\n", |
| accel_state->common_attributes.data_ready); |
| if (accel_state->common_attributes.data_ready) |
| hid_sensor_push_data(indio_dev, |
| (u8 *)accel_state->accel_val, |
| sizeof(accel_state->accel_val)); |
| |
| return 0; |
| } |
| |
| /* Capture samples in local storage */ |
| static int accel_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 accel_3d_state *accel_state = iio_priv(indio_dev); |
| int offset; |
| int ret = -EINVAL; |
| |
| switch (usage_id) { |
| case HID_USAGE_SENSOR_ACCEL_X_AXIS: |
| case HID_USAGE_SENSOR_ACCEL_Y_AXIS: |
| case HID_USAGE_SENSOR_ACCEL_Z_AXIS: |
| offset = usage_id - HID_USAGE_SENSOR_ACCEL_X_AXIS; |
| accel_state->accel_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 accel_3d_parse_report(struct platform_device *pdev, |
| struct hid_sensor_hub_device *hsdev, |
| struct iio_chan_spec *channels, |
| unsigned usage_id, |
| struct accel_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_ACCEL_X_AXIS + i, |
| &st->accel[CHANNEL_SCAN_INDEX_X + i]); |
| if (ret < 0) |
| break; |
| accel_3d_adjust_channel_bit_mask(channels, |
| CHANNEL_SCAN_INDEX_X + i, |
| st->accel[CHANNEL_SCAN_INDEX_X + i].size); |
| } |
| dev_dbg(&pdev->dev, "accel_3d %x:%x, %x:%x, %x:%x\n", |
| st->accel[0].index, |
| st->accel[0].report_id, |
| st->accel[1].index, st->accel[1].report_id, |
| st->accel[2].index, st->accel[2].report_id); |
| |
| return ret; |
| } |
| |
| /* Function to initialize the processing for usage id */ |
| static int __devinit hid_accel_3d_probe(struct platform_device *pdev) |
| { |
| int ret = 0; |
| static const char *name = "accel_3d"; |
| struct iio_dev *indio_dev; |
| struct accel_3d_state *accel_state; |
| struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; |
| struct iio_chan_spec *channels; |
| |
| indio_dev = iio_device_alloc(sizeof(struct accel_3d_state)); |
| if (indio_dev == NULL) { |
| ret = -ENOMEM; |
| goto error_ret; |
| } |
| platform_set_drvdata(pdev, indio_dev); |
| |
| accel_state = iio_priv(indio_dev); |
| accel_state->common_attributes.hsdev = hsdev; |
| accel_state->common_attributes.pdev = pdev; |
| |
| ret = hid_sensor_parse_common_attributes(hsdev, |
| HID_USAGE_SENSOR_ACCEL_3D, |
| &accel_state->common_attributes); |
| if (ret) { |
| dev_err(&pdev->dev, "failed to setup common attributes\n"); |
| goto error_free_dev; |
| } |
| |
| channels = kmemdup(accel_3d_channels, |
| sizeof(accel_3d_channels), |
| GFP_KERNEL); |
| if (!channels) { |
| dev_err(&pdev->dev, "failed to duplicate channels\n"); |
| goto error_free_dev; |
| } |
| |
| ret = accel_3d_parse_report(pdev, hsdev, channels, |
| HID_USAGE_SENSOR_ACCEL_3D, accel_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(accel_3d_channels); |
| indio_dev->dev.parent = &pdev->dev; |
| indio_dev->info = &accel_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; |
| } |
| accel_state->common_attributes.data_ready = false; |
| ret = hid_sensor_setup_trigger(indio_dev, name, |
| &accel_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; |
| } |
| |
| accel_state->callbacks.send_event = accel_3d_proc_event; |
| accel_state->callbacks.capture_sample = accel_3d_capture_sample; |
| accel_state->callbacks.pdev = pdev; |
| ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ACCEL_3D, |
| &accel_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(indio_dev); |
| error_unreg_buffer_funcs: |
| iio_triggered_buffer_cleanup(indio_dev); |
| error_free_dev_mem: |
| kfree(indio_dev->channels); |
| error_free_dev: |
| iio_device_free(indio_dev); |
| error_ret: |
| return ret; |
| } |
| |
| /* Function to deinitialize the processing for usage id */ |
| static int __devinit hid_accel_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); |
| |
| sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ACCEL_3D); |
| iio_device_unregister(indio_dev); |
| hid_sensor_remove_trigger(indio_dev); |
| iio_triggered_buffer_cleanup(indio_dev); |
| kfree(indio_dev->channels); |
| iio_device_free(indio_dev); |
| |
| return 0; |
| } |
| |
| static struct platform_driver hid_accel_3d_platform_driver = { |
| .driver = { |
| .name = DRIVER_NAME, |
| .owner = THIS_MODULE, |
| }, |
| .probe = hid_accel_3d_probe, |
| .remove = hid_accel_3d_remove, |
| }; |
| module_platform_driver(hid_accel_3d_platform_driver); |
| |
| MODULE_DESCRIPTION("HID Sensor Accel 3D"); |
| MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>"); |
| MODULE_LICENSE("GPL"); |