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Diffstat (limited to 'include/linux/hid-sensor-hub.h')
| -rw-r--r-- | include/linux/hid-sensor-hub.h | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/include/linux/hid-sensor-hub.h b/include/linux/hid-sensor-hub.h new file mode 100644 index 000000000..c02b5ce6c --- /dev/null +++ b/include/linux/hid-sensor-hub.h @@ -0,0 +1,273 @@ +/* + * 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; + 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; +}; + +/* 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 |