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>
24 #include <linux/iio/iio.h>
25 #include <linux/iio/trigger.h>
28 * struct hid_sensor_hub_attribute_info - Attribute info
29 * @usage_id: Parent usage id of a physical device.
30 * @attrib_id: Attribute id for this attribute.
31 * @report_id: Report id in which this information resides.
32 * @index: Field index in the report.
33 * @units: Measurment unit for this attribute.
34 * @unit_expo: Exponent used in the data.
35 * @size: Size in bytes for data size.
37 struct hid_sensor_hub_attribute_info {
50 * struct sensor_hub_pending - Synchronous read pending information
51 * @status: Pending status true/false.
52 * @ready: Completion synchronization data.
53 * @usage_id: Usage id for physical device, E.g. Gyro usage id.
54 * @attr_usage_id: Usage Id of a field, E.g. X-AXIS for a gyro.
55 * @raw_size: Response size for a read request.
56 * @raw_data: Place holder for received response.
58 struct sensor_hub_pending {
60 struct completion ready;
68 * struct hid_sensor_hub_device - Stores the hub instance data
69 * @hdev: Stores the hid instance.
70 * @vendor_id: Vendor id of hub device.
71 * @product_id: Product id of hub device.
72 * @usage: Usage id for this hub device instance.
73 * @start_collection_index: Starting index for a phy type collection
74 * @end_collection_index: Last index for a phy type collection
75 * @mutex: synchronizing mutex.
76 * @pending: Holds information of pending sync read request.
78 struct hid_sensor_hub_device {
79 struct hid_device *hdev;
83 int start_collection_index;
84 int end_collection_index;
86 struct sensor_hub_pending pending;
90 * struct hid_sensor_hub_callbacks - Client callback functions
91 * @pdev: Platform device instance of the client driver.
92 * @suspend: Suspend callback.
93 * @resume: Resume callback.
94 * @capture_sample: Callback to get a sample.
95 * @send_event: Send notification to indicate all samples are
96 * captured, process and send event
98 struct hid_sensor_hub_callbacks {
99 struct platform_device *pdev;
100 int (*suspend)(struct hid_sensor_hub_device *hsdev, void *priv);
101 int (*resume)(struct hid_sensor_hub_device *hsdev, void *priv);
102 int (*capture_sample)(struct hid_sensor_hub_device *hsdev,
103 u32 usage_id, size_t raw_len, char *raw_data,
105 int (*send_event)(struct hid_sensor_hub_device *hsdev, u32 usage_id,
110 * sensor_hub_device_open() - Open hub device
111 * @hsdev: Hub device instance.
113 * Used to open hid device for sensor hub.
115 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev);
118 * sensor_hub_device_clode() - Close hub device
119 * @hsdev: Hub device instance.
121 * Used to clode hid device for sensor hub.
123 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev);
125 /* Registration functions */
128 * sensor_hub_register_callback() - Register client callbacks
129 * @hsdev: Hub device instance.
130 * @usage_id: Usage id of the client (E.g. 0x200076 for Gyro).
131 * @usage_callback: Callback function storage
133 * Used to register callbacks by client processing drivers. Sensor
134 * hub core driver will call these callbacks to offload processing
135 * of data streams and notifications.
137 int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
139 struct hid_sensor_hub_callbacks *usage_callback);
142 * sensor_hub_remove_callback() - Remove client callbacks
143 * @hsdev: Hub device instance.
144 * @usage_id: Usage id of the client (E.g. 0x200076 for Gyro).
146 * If there is a callback registred, this call will remove that
147 * callbacks, so that it will stop data and event notifications.
149 int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
153 /* Hid sensor hub core interfaces */
156 * sensor_hub_input_get_attribute_info() - Get an attribute information
157 * @hsdev: Hub device instance.
158 * @type: Type of this attribute, input/output/feature
159 * @usage_id: Attribute usage id of parent physical device as per spec
160 * @attr_usage_id: Attribute usage id as per spec
161 * @info: return information about attribute after parsing report
163 * Parses report and returns the attribute information such as report id,
164 * field index, units and exponet etc.
166 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
168 u32 usage_id, u32 attr_usage_id,
169 struct hid_sensor_hub_attribute_info *info);
172 * sensor_hub_input_attr_get_raw_value() - Attribute read request
173 * @usage_id: Attribute usage id of parent physical device as per spec
174 * @attr_usage_id: Attribute usage id as per spec
175 * @report_id: Report id to look for
176 * @flag: Synchronous or asynchronous read
178 * Issues a synchronous or asynchronous read request for an input attribute.
179 * Returns data upto 32 bits.
182 enum sensor_hub_read_flags {
187 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
189 u32 attr_usage_id, u32 report_id,
190 enum sensor_hub_read_flags flag
194 * sensor_hub_set_feature() - Feature set request
195 * @report_id: Report id to look for
196 * @field_index: Field index inside a report
197 * @buffer_size: size of the buffer
198 * @buffer: buffer to use in the feature set
200 * Used to set a field in feature report. For example this can set polling
201 * interval, sensitivity, activate/deactivate state.
203 int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
204 u32 field_index, int buffer_size, void *buffer);
207 * sensor_hub_get_feature() - Feature get request
208 * @report_id: Report id to look for
209 * @field_index: Field index inside a report
210 * @buffer_size: size of the buffer
211 * @buffer: buffer to copy output
213 * Used to get a field in feature report. For example this can get polling
214 * interval, sensitivity, activate/deactivate state. On success it returns
215 * number of bytes copied to buffer. On failure, it returns value < 0.
217 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
218 u32 field_index, int buffer_size, void *buffer);
220 /* hid-sensor-attributes */
222 /* Common hid sensor iio structure */
223 struct hid_sensor_common {
224 struct hid_sensor_hub_device *hsdev;
225 struct platform_device *pdev;
228 struct iio_trigger *trigger;
229 struct hid_sensor_hub_attribute_info poll;
230 struct hid_sensor_hub_attribute_info report_state;
231 struct hid_sensor_hub_attribute_info power_state;
232 struct hid_sensor_hub_attribute_info sensitivity;
235 /* Convert from hid unit expo to regular exponent */
236 static inline int hid_sensor_convert_exponent(int unit_expo)
238 if (unit_expo < 0x08)
240 else if (unit_expo <= 0x0f)
241 return -(0x0f-unit_expo+1);
246 int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev,
248 struct hid_sensor_common *st);
249 int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st,
251 int hid_sensor_read_raw_hyst_value(struct hid_sensor_common *st,
252 int *val1, int *val2);
253 int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st,
255 int hid_sensor_read_samp_freq_value(struct hid_sensor_common *st,
256 int *val1, int *val2);
258 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
259 u32 report_id, int field_index, u32 usage_id);
261 int hid_sensor_format_scale(u32 usage_id,
262 struct hid_sensor_hub_attribute_info *attr_info,
263 int *val0, int *val1);
265 s32 hid_sensor_read_poll_value(struct hid_sensor_common *st);