| /* |
| * 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. |
| * |
| */ |
| #ifndef _HID_SENSORS_HUB_H |
| #define _HID_SENSORS_HUB_H |
| |
| #include <linux/hid.h> |
| #include <linux/hid-sensor-ids.h> |
| #include <linux/iio/iio.h> |
| #include <linux/iio/trigger.h> |
| |
| /** |
| * struct hid_sensor_hub_attribute_info - Attribute info |
| * @usage_id: Parent usage id of a physical device. |
| * @attrib_id: Attribute id for this attribute. |
| * @report_id: Report id in which this information resides. |
| * @index: Field index in the report. |
| * @units: Measurment unit for this attribute. |
| * @unit_expo: Exponent used in the data. |
| * @size: Size in bytes for data size. |
| * @logical_minimum: Logical minimum value for this attribute. |
| * @logical_maximum: Logical maximum value for this attribute. |
| */ |
| struct hid_sensor_hub_attribute_info { |
| u32 usage_id; |
| u32 attrib_id; |
| s32 report_id; |
| s32 index; |
| s32 units; |
| s32 unit_expo; |
| s32 size; |
| s32 logical_minimum; |
| s32 logical_maximum; |
| }; |
| |
| /** |
| * struct sensor_hub_pending - Synchronous read pending information |
| * @status: Pending status true/false. |
| * @ready: Completion synchronization data. |
| * @usage_id: Usage id for physical device, E.g. Gyro usage id. |
| * @attr_usage_id: Usage Id of a field, E.g. X-AXIS for a gyro. |
| * @raw_size: Response size for a read request. |
| * @raw_data: Place holder for received response. |
| */ |
| struct sensor_hub_pending { |
| bool status; |
| struct completion ready; |
| u32 usage_id; |
| u32 attr_usage_id; |
| int raw_size; |
| u8 *raw_data; |
| }; |
| |
| /** |
| * struct hid_sensor_hub_device - Stores the hub instance data |
| * @hdev: Stores the hid instance. |
| * @vendor_id: Vendor id of hub device. |
| * @product_id: Product id of hub device. |
| * @usage: Usage id for this hub device instance. |
| * @start_collection_index: Starting index for a phy type collection |
| * @end_collection_index: Last index for a phy type collection |
| * @mutex_ptr: synchronizing mutex pointer. |
| * @pending: Holds information of pending sync read request. |
| */ |
| struct hid_sensor_hub_device { |
| struct hid_device *hdev; |
| u32 vendor_id; |
| u32 product_id; |
| u32 usage; |
| int start_collection_index; |
| int end_collection_index; |
| struct mutex *mutex_ptr; |
| struct sensor_hub_pending pending; |
| }; |
| |
| /** |
| * struct hid_sensor_hub_callbacks - Client callback functions |
| * @pdev: Platform device instance of the client driver. |
| * @suspend: Suspend callback. |
| * @resume: Resume callback. |
| * @capture_sample: Callback to get a sample. |
| * @send_event: Send notification to indicate all samples are |
| * captured, process and send event |
| */ |
| struct hid_sensor_hub_callbacks { |
| struct platform_device *pdev; |
| int (*suspend)(struct hid_sensor_hub_device *hsdev, void *priv); |
| int (*resume)(struct hid_sensor_hub_device *hsdev, void *priv); |
| int (*capture_sample)(struct hid_sensor_hub_device *hsdev, |
| u32 usage_id, size_t raw_len, char *raw_data, |
| void *priv); |
| int (*send_event)(struct hid_sensor_hub_device *hsdev, u32 usage_id, |
| void *priv); |
| }; |
| |
| /** |
| * sensor_hub_device_open() - Open hub device |
| * @hsdev: Hub device instance. |
| * |
| * Used to open hid device for sensor hub. |
| */ |
| int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev); |
| |
| /** |
| * sensor_hub_device_clode() - Close hub device |
| * @hsdev: Hub device instance. |
| * |
| * Used to clode hid device for sensor hub. |
| */ |
| void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev); |
| |
| /* Registration functions */ |
| |
| /** |
| * sensor_hub_register_callback() - Register client callbacks |
| * @hsdev: Hub device instance. |
| * @usage_id: Usage id of the client (E.g. 0x200076 for Gyro). |
| * @usage_callback: Callback function storage |
| * |
| * Used to register callbacks by client processing drivers. Sensor |
| * hub core driver will call these callbacks to offload processing |
| * of data streams and notifications. |
| */ |
| int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev, |
| u32 usage_id, |
| struct hid_sensor_hub_callbacks *usage_callback); |
| |
| /** |
| * sensor_hub_remove_callback() - Remove client callbacks |
| * @hsdev: Hub device instance. |
| * @usage_id: Usage id of the client (E.g. 0x200076 for Gyro). |
| * |
| * If there is a callback registred, this call will remove that |
| * callbacks, so that it will stop data and event notifications. |
| */ |
| int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev, |
| u32 usage_id); |
| |
| |
| /* Hid sensor hub core interfaces */ |
| |
| /** |
| * sensor_hub_input_get_attribute_info() - Get an attribute information |
| * @hsdev: Hub device instance. |
| * @type: Type of this attribute, input/output/feature |
| * @usage_id: Attribute usage id of parent physical device as per spec |
| * @attr_usage_id: Attribute usage id as per spec |
| * @info: return information about attribute after parsing report |
| * |
| * Parses report and returns the attribute information such as report id, |
| * field index, units and exponet etc. |
| */ |
| int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev, |
| u8 type, |
| u32 usage_id, u32 attr_usage_id, |
| struct hid_sensor_hub_attribute_info *info); |
| |
| /** |
| * sensor_hub_input_attr_get_raw_value() - Synchronous read request |
| * @hsdev: Hub device instance. |
| * @usage_id: Attribute usage id of parent physical device as per spec |
| * @attr_usage_id: Attribute usage id as per spec |
| * @report_id: Report id to look for |
| * @flag: Synchronous or asynchronous read |
| * |
| * Issues a synchronous or asynchronous read request for an input attribute. |
| * Returns data upto 32 bits. |
| */ |
| |
| enum sensor_hub_read_flags { |
| SENSOR_HUB_SYNC, |
| SENSOR_HUB_ASYNC, |
| }; |
| |
| int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev, |
| u32 usage_id, |
| u32 attr_usage_id, u32 report_id, |
| enum sensor_hub_read_flags flag |
| ); |
| |
| /** |
| * sensor_hub_set_feature() - Feature set request |
| * @hsdev: Hub device instance. |
| * @report_id: Report id to look for |
| * @field_index: Field index inside a report |
| * @buffer_size: size of the buffer |
| * @buffer: buffer to use in the feature set |
| * |
| * Used to set a field in feature report. For example this can set polling |
| * interval, sensitivity, activate/deactivate state. |
| */ |
| int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id, |
| u32 field_index, int buffer_size, void *buffer); |
| |
| /** |
| * sensor_hub_get_feature() - Feature get request |
| * @hsdev: Hub device instance. |
| * @report_id: Report id to look for |
| * @field_index: Field index inside a report |
| * @buffer_size: size of the buffer |
| * @buffer: buffer to copy output |
| * |
| * Used to get a field in feature report. For example this can get polling |
| * interval, sensitivity, activate/deactivate state. On success it returns |
| * number of bytes copied to buffer. On failure, it returns value < 0. |
| */ |
| int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id, |
| u32 field_index, int buffer_size, void *buffer); |
| |
| /* hid-sensor-attributes */ |
| |
| /* Common hid sensor iio structure */ |
| struct hid_sensor_common { |
| struct hid_sensor_hub_device *hsdev; |
| struct platform_device *pdev; |
| unsigned usage_id; |
| atomic_t data_ready; |
| atomic_t user_requested_state; |
| int poll_interval; |
| int raw_hystersis; |
| struct iio_trigger *trigger; |
| struct hid_sensor_hub_attribute_info poll; |
| struct hid_sensor_hub_attribute_info report_state; |
| struct hid_sensor_hub_attribute_info power_state; |
| struct hid_sensor_hub_attribute_info sensitivity; |
| struct work_struct work; |
| }; |
| |
| /* Convert from hid unit expo to regular exponent */ |
| static inline int hid_sensor_convert_exponent(int unit_expo) |
| { |
| if (unit_expo < 0x08) |
| return unit_expo; |
| else if (unit_expo <= 0x0f) |
| return -(0x0f-unit_expo+1); |
| else |
| return 0; |
| } |
| |
| int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev, |
| u32 usage_id, |
| struct hid_sensor_common *st); |
| int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st, |
| int val1, int val2); |
| int hid_sensor_read_raw_hyst_value(struct hid_sensor_common *st, |
| int *val1, int *val2); |
| int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st, |
| int val1, int val2); |
| int hid_sensor_read_samp_freq_value(struct hid_sensor_common *st, |
| int *val1, int *val2); |
| |
| int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev, |
| u32 report_id, int field_index, u32 usage_id); |
| |
| int hid_sensor_format_scale(u32 usage_id, |
| struct hid_sensor_hub_attribute_info *attr_info, |
| int *val0, int *val1); |
| |
| s32 hid_sensor_read_poll_value(struct hid_sensor_common *st); |
| |
| #endif |
