1 /*
2 * HID Sensors Driver
3 * Copyright (c) 2012, Intel Corporation.
4 *
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.
8 *
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
12 * more details.
13 *
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.
17 *
18 */
19 #ifndef _HID_SENSORS_HUB_H
20 #define _HID_SENSORS_HUB_H
21
22 #include <linux/hid.h>
23 #include <linux/hid-sensor-ids.h>
24 #include <linux/iio/iio.h>
25 #include <linux/iio/trigger.h>
26
27 /**
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.
36 * @logical_minimum: Logical minimum value for this attribute.
37 * @logical_maximum: Logical maximum value for this attribute.
38 */
39 struct hid_sensor_hub_attribute_info {
40 u32 usage_id;
41 u32 attrib_id;
42 s32 report_id;
43 s32 index;
44 s32 units;
45 s32 unit_expo;
46 s32 size;
47 s32 logical_minimum;
48 s32 logical_maximum;
49 };
50
51 /**
52 * struct sensor_hub_pending - Synchronous read pending information
53 * @status: Pending status true/false.
54 * @ready: Completion synchronization data.
55 * @usage_id: Usage id for physical device, E.g. Gyro usage id.
56 * @attr_usage_id: Usage Id of a field, E.g. X-AXIS for a gyro.
57 * @raw_size: Response size for a read request.
58 * @raw_data: Place holder for received response.
59 */
60 struct sensor_hub_pending {
61 bool status;
62 struct completion ready;
63 u32 usage_id;
64 u32 attr_usage_id;
65 int raw_size;
66 u8 *raw_data;
67 };
68
69 /**
70 * struct hid_sensor_hub_device - Stores the hub instance data
71 * @hdev: Stores the hid instance.
72 * @vendor_id: Vendor id of hub device.
73 * @product_id: Product id of hub device.
74 * @usage: Usage id for this hub device instance.
75 * @start_collection_index: Starting index for a phy type collection
76 * @end_collection_index: Last index for a phy type collection
77 * @mutex_ptr: synchronizing mutex pointer.
78 * @pending: Holds information of pending sync read request.
79 */
80 struct hid_sensor_hub_device {
81 struct hid_device *hdev;
82 u32 vendor_id;
83 u32 product_id;
84 u32 usage;
85 int start_collection_index;
86 int end_collection_index;
87 struct mutex *mutex_ptr;
88 struct sensor_hub_pending pending;
89 };
90
91 /**
92 * struct hid_sensor_hub_callbacks - Client callback functions
93 * @pdev: Platform device instance of the client driver.
94 * @suspend: Suspend callback.
95 * @resume: Resume callback.
96 * @capture_sample: Callback to get a sample.
97 * @send_event: Send notification to indicate all samples are
98 * captured, process and send event
99 */
100 struct hid_sensor_hub_callbacks {
101 struct platform_device *pdev;
102 int (*suspend)(struct hid_sensor_hub_device *hsdev, void *priv);
103 int (*resume)(struct hid_sensor_hub_device *hsdev, void *priv);
104 int (*capture_sample)(struct hid_sensor_hub_device *hsdev,
105 u32 usage_id, size_t raw_len, char *raw_data,
106 void *priv);
107 int (*send_event)(struct hid_sensor_hub_device *hsdev, u32 usage_id,
108 void *priv);
109 };
110
111 /**
112 * sensor_hub_device_open() - Open hub device
113 * @hsdev: Hub device instance.
114 *
115 * Used to open hid device for sensor hub.
116 */
117 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev);
118
119 /**
120 * sensor_hub_device_clode() - Close hub device
121 * @hsdev: Hub device instance.
122 *
123 * Used to clode hid device for sensor hub.
124 */
125 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev);
126
127 /* Registration functions */
128
129 /**
130 * sensor_hub_register_callback() - Register client callbacks
131 * @hsdev: Hub device instance.
132 * @usage_id: Usage id of the client (E.g. 0x200076 for Gyro).
133 * @usage_callback: Callback function storage
134 *
135 * Used to register callbacks by client processing drivers. Sensor
136 * hub core driver will call these callbacks to offload processing
137 * of data streams and notifications.
138 */
139 int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
140 u32 usage_id,
141 struct hid_sensor_hub_callbacks *usage_callback);
142
143 /**
144 * sensor_hub_remove_callback() - Remove client callbacks
145 * @hsdev: Hub device instance.
146 * @usage_id: Usage id of the client (E.g. 0x200076 for Gyro).
147 *
148 * If there is a callback registred, this call will remove that
149 * callbacks, so that it will stop data and event notifications.
150 */
151 int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
152 u32 usage_id);
153
154
155 /* Hid sensor hub core interfaces */
156
157 /**
158 * sensor_hub_input_get_attribute_info() - Get an attribute information
159 * @hsdev: Hub device instance.
160 * @type: Type of this attribute, input/output/feature
161 * @usage_id: Attribute usage id of parent physical device as per spec
162 * @attr_usage_id: Attribute usage id as per spec
163 * @info: return information about attribute after parsing report
164 *
165 * Parses report and returns the attribute information such as report id,
166 * field index, units and exponet etc.
167 */
168 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
169 u8 type,
170 u32 usage_id, u32 attr_usage_id,
171 struct hid_sensor_hub_attribute_info *info);
172
173 /**
174 * sensor_hub_input_attr_get_raw_value() - Synchronous read request
175 * @hsdev: Hub device instance.
176 * @usage_id: Attribute usage id of parent physical device as per spec
177 * @attr_usage_id: Attribute usage id as per spec
178 * @report_id: Report id to look for
179 * @flag: Synchronous or asynchronous read
180 * @is_signed: If true then fields < 32 bits will be sign-extended
181 *
182 * Issues a synchronous or asynchronous read request for an input attribute.
183 * Returns data upto 32 bits.
184 */
185
186 enum sensor_hub_read_flags {
187 SENSOR_HUB_SYNC,
188 SENSOR_HUB_ASYNC,
189 };
190
191 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
192 u32 usage_id,
193 u32 attr_usage_id, u32 report_id,
194 enum sensor_hub_read_flags flag,
195 bool is_signed
196 );
197
198 /**
199 * sensor_hub_set_feature() - Feature set request
200 * @hsdev: Hub device instance.
201 * @report_id: Report id to look for
202 * @field_index: Field index inside a report
203 * @buffer_size: size of the buffer
204 * @buffer: buffer to use in the feature set
205 *
206 * Used to set a field in feature report. For example this can set polling
207 * interval, sensitivity, activate/deactivate state.
208 */
209 int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
210 u32 field_index, int buffer_size, void *buffer);
211
212 /**
213 * sensor_hub_get_feature() - Feature get request
214 * @hsdev: Hub device instance.
215 * @report_id: Report id to look for
216 * @field_index: Field index inside a report
217 * @buffer_size: size of the buffer
218 * @buffer: buffer to copy output
219 *
220 * Used to get a field in feature report. For example this can get polling
221 * interval, sensitivity, activate/deactivate state. On success it returns
222 * number of bytes copied to buffer. On failure, it returns value < 0.
223 */
224 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
225 u32 field_index, int buffer_size, void *buffer);
226
227 /* hid-sensor-attributes */
228
229 /* Common hid sensor iio structure */
230 struct hid_sensor_common {
231 struct hid_sensor_hub_device *hsdev;
232 struct platform_device *pdev;
233 unsigned usage_id;
234 atomic_t data_ready;
235 atomic_t user_requested_state;
236 atomic_t runtime_pm_enable;
237 int poll_interval;
238 int raw_hystersis;
239 int latency_ms;
240 struct iio_trigger *trigger;
241 int timestamp_ns_scale;
242 struct hid_sensor_hub_attribute_info poll;
243 struct hid_sensor_hub_attribute_info report_state;
244 struct hid_sensor_hub_attribute_info power_state;
245 struct hid_sensor_hub_attribute_info sensitivity;
246 struct hid_sensor_hub_attribute_info report_latency;
247 struct work_struct work;
248 };
249
250 /* Convert from hid unit expo to regular exponent */
hid_sensor_convert_exponent(int unit_expo)251 static inline int hid_sensor_convert_exponent(int unit_expo)
252 {
253 if (unit_expo < 0x08)
254 return unit_expo;
255 else if (unit_expo <= 0x0f)
256 return -(0x0f-unit_expo+1);
257 else
258 return 0;
259 }
260
261 int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev,
262 u32 usage_id,
263 struct hid_sensor_common *st);
264 int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st,
265 int val1, int val2);
266 int hid_sensor_read_raw_hyst_value(struct hid_sensor_common *st,
267 int *val1, int *val2);
268 int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st,
269 int val1, int val2);
270 int hid_sensor_read_samp_freq_value(struct hid_sensor_common *st,
271 int *val1, int *val2);
272
273 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
274 u32 report_id, int field_index, u32 usage_id);
275
276 int hid_sensor_format_scale(u32 usage_id,
277 struct hid_sensor_hub_attribute_info *attr_info,
278 int *val0, int *val1);
279
280 s32 hid_sensor_read_poll_value(struct hid_sensor_common *st);
281
282 int64_t hid_sensor_convert_timestamp(struct hid_sensor_common *st,
283 int64_t raw_value);
284 bool hid_sensor_batch_mode_supported(struct hid_sensor_common *st);
285 int hid_sensor_set_report_latency(struct hid_sensor_common *st, int latency);
286 int hid_sensor_get_report_latency(struct hid_sensor_common *st);
287
288 #endif
289