3 * Copyright (c) 2012, Intel Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
19 #ifndef _HID_SENSORS_HUB_H
20 #define _HID_SENSORS_HUB_H
22 #include <linux/hid.h>
23 #include <linux/hid-sensor-ids.h>
26 * struct hid_sensor_hub_attribute_info - Attribute info
27 * @usage_id: Parent usage id of a physical device.
28 * @attrib_id: Attribute id for this attribute.
29 * @report_id: Report id in which this information resides.
30 * @index: Field index in the report.
31 * @units: Measurment unit for this attribute.
32 * @unit_expo: Exponent used in the data.
33 * @size: Size in bytes for data size.
35 struct hid_sensor_hub_attribute_info {
46 * struct hid_sensor_hub_device - Stores the hub instance data
47 * @hdev: Stores the hid instance.
48 * @vendor_id: Vendor id of hub device.
49 * @product_id: Product id of hub device.
51 struct hid_sensor_hub_device {
52 struct hid_device *hdev;
58 * struct hid_sensor_hub_callbacks - Client callback functions
59 * @pdev: Platform device instance of the client driver.
60 * @suspend: Suspend callback.
61 * @resume: Resume callback.
62 * @capture_sample: Callback to get a sample.
63 * @send_event: Send notification to indicate all samples are
64 * captured, process and send event
66 struct hid_sensor_hub_callbacks {
67 struct platform_device *pdev;
68 int (*suspend)(struct hid_sensor_hub_device *hsdev, void *priv);
69 int (*resume)(struct hid_sensor_hub_device *hsdev, void *priv);
70 int (*capture_sample)(struct hid_sensor_hub_device *hsdev,
71 u32 usage_id, size_t raw_len, char *raw_data,
73 int (*send_event)(struct hid_sensor_hub_device *hsdev, u32 usage_id,
77 /* Registration functions */
80 * sensor_hub_register_callback() - Register client callbacks
81 * @hsdev: Hub device instance.
82 * @usage_id: Usage id of the client (E.g. 0x200076 for Gyro).
83 * @usage_callback: Callback function storage
85 * Used to register callbacks by client processing drivers. Sensor
86 * hub core driver will call these callbacks to offload processing
87 * of data streams and notifications.
89 int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
91 struct hid_sensor_hub_callbacks *usage_callback);
94 * sensor_hub_remove_callback() - Remove client callbacks
95 * @hsdev: Hub device instance.
96 * @usage_id: Usage id of the client (E.g. 0x200076 for Gyro).
98 * If there is a callback registred, this call will remove that
99 * callbacks, so that it will stop data and event notifications.
101 int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
105 /* Hid sensor hub core interfaces */
108 * sensor_hub_input_get_attribute_info() - Get an attribute information
109 * @hsdev: Hub device instance.
110 * @type: Type of this attribute, input/output/feature
111 * @usage_id: Attribute usage id of parent physical device as per spec
112 * @attr_usage_id: Attribute usage id as per spec
113 * @info: return information about attribute after parsing report
115 * Parses report and returns the attribute information such as report id,
116 * field index, units and exponet etc.
118 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
120 u32 usage_id, u32 attr_usage_id,
121 struct hid_sensor_hub_attribute_info *info);
124 * sensor_hub_input_attr_get_raw_value() - Synchronous read request
125 * @usage_id: Attribute usage id of parent physical device as per spec
126 * @attr_usage_id: Attribute usage id as per spec
127 * @report_id: Report id to look for
129 * Issues a synchronous read request for an input attribute. Returns
130 * data upto 32 bits. Since client can get events, so this call should
131 * not be used for data paths, this will impact performance.
134 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
136 u32 attr_usage_id, u32 report_id);
138 * sensor_hub_set_feature() - Feature set request
139 * @report_id: Report id to look for
140 * @field_index: Field index inside a report
141 * @value: Value to set
143 * Used to set a field in feature report. For example this can set polling
144 * interval, sensitivity, activate/deactivate state.
146 int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
147 u32 field_index, s32 value);
150 * sensor_hub_get_feature() - Feature get request
151 * @report_id: Report id to look for
152 * @field_index: Field index inside a report
153 * @value: Place holder for return value
155 * Used to get a field in feature report. For example this can get polling
156 * interval, sensitivity, activate/deactivate state.
158 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
159 u32 field_index, s32 *value);
161 /* hid-sensor-attributes */
163 /* Common hid sensor iio structure */
164 struct hid_sensor_common {
165 struct hid_sensor_hub_device *hsdev;
166 struct platform_device *pdev;
169 struct hid_sensor_hub_attribute_info poll;
170 struct hid_sensor_hub_attribute_info report_state;
171 struct hid_sensor_hub_attribute_info power_state;
172 struct hid_sensor_hub_attribute_info sensitivity;
175 /*Convert from hid unit expo to regular exponent*/
176 static inline int hid_sensor_convert_exponent(int unit_expo)
178 if (unit_expo < 0x08)
180 else if (unit_expo <= 0x0f)
181 return -(0x0f-unit_expo+1);
186 int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev,
188 struct hid_sensor_common *st);
189 int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st,
191 int hid_sensor_read_raw_hyst_value(struct hid_sensor_common *st,
192 int *val1, int *val2);
193 int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st,
195 int hid_sensor_read_samp_freq_value(struct hid_sensor_common *st,
196 int *val1, int *val2);