include/linux/hid-sensor-hub.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * HID Sensors Driver
   4  * Copyright (c) 2012, Intel Corporation.
   5  */
   6 #ifndef _HID_SENSORS_HUB_H
   7 #define _HID_SENSORS_HUB_H
   8
   9 #include <linux/hid.h>
  10 #include <linux/hid-sensor-ids.h>
  11 #include <linux/iio/iio.h>
  12 #include <linux/iio/trigger.h>
  13
  14 /**
  15  * struct hid_sensor_hub_attribute_info - Attribute info
  16  * @usage_id:           Parent usage id of a physical device.
  17  * @attrib_id:          Attribute id for this attribute.
  18  * @report_id:          Report id in which this information resides.
  19  * @index:              Field index in the report.
  20  * @units:              Measurment unit for this attribute.
  21  * @unit_expo:          Exponent used in the data.
  22  * @size:               Size in bytes for data size.
  23  * @logical_minimum:    Logical minimum value for this attribute.
  24  * @logical_maximum:    Logical maximum value for this attribute.
  25  */
  26 struct hid_sensor_hub_attribute_info {
  27         u32 usage_id;
  28         u32 attrib_id;
  29         s32 report_id;
  30         s32 index;
  31         s32 units;
  32         s32 unit_expo;
  33         s32 size;
  34         s32 logical_minimum;
  35         s32 logical_maximum;
  36 };
  37
  38 /**
  39  * struct sensor_hub_pending - Synchronous read pending information
  40  * @status:             Pending status true/false.
  41  * @ready:              Completion synchronization data.
  42  * @usage_id:           Usage id for physical device, E.g. Gyro usage id.
  43  * @attr_usage_id:      Usage Id of a field, E.g. X-AXIS for a gyro.
  44  * @raw_size:           Response size for a read request.
  45  * @raw_data:           Place holder for received response.
  46  */
  47 struct sensor_hub_pending {
  48         bool status;
  49         struct completion ready;
  50         u32 usage_id;
  51         u32 attr_usage_id;
  52         int raw_size;
  53         u8  *raw_data;
  54 };
  55
  56 /**
  57  * struct hid_sensor_hub_device - Stores the hub instance data
  58  * @hdev:               Stores the hid instance.
  59  * @vendor_id:          Vendor id of hub device.
  60  * @product_id:         Product id of hub device.
  61  * @usage:              Usage id for this hub device instance.
  62  * @start_collection_index: Starting index for a phy type collection
  63  * @end_collection_index: Last index for a phy type collection
  64  * @mutex_ptr:          synchronizing mutex pointer.
  65  * @pending:            Holds information of pending sync read request.
  66  */
  67 struct hid_sensor_hub_device {
  68         struct hid_device *hdev;
  69         u32 vendor_id;
  70         u32 product_id;
  71         u32 usage;
  72         int start_collection_index;
  73         int end_collection_index;
  74         struct mutex *mutex_ptr;
  75         struct sensor_hub_pending pending;
  76 };
  77
  78 /**
  79  * struct hid_sensor_hub_callbacks - Client callback functions
  80  * @pdev:               Platform device instance of the client driver.
  81  * @suspend:            Suspend callback.
  82  * @resume:             Resume callback.
  83  * @capture_sample:     Callback to get a sample.
  84  * @send_event:         Send notification to indicate all samples are
  85  *                      captured, process and send event
  86  */
  87 struct hid_sensor_hub_callbacks {
  88         struct platform_device *pdev;
  89         int (*suspend)(struct hid_sensor_hub_device *hsdev, void *priv);
  90         int (*resume)(struct hid_sensor_hub_device *hsdev, void *priv);
  91         int (*capture_sample)(struct hid_sensor_hub_device *hsdev,
  92                         u32 usage_id, size_t raw_len, char *raw_data,
  93                         void *priv);
  94         int (*send_event)(struct hid_sensor_hub_device *hsdev, u32 usage_id,
  95                          void *priv);
  96 };
  97
  98 /**
  99 * sensor_hub_device_open() - Open hub device
 100 * @hsdev:       Hub device instance.
 101 *
 102 * Used to open hid device for sensor hub.
 103 */
 104 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev);
 105
 106 /**
 107 * sensor_hub_device_clode() - Close hub device
 108 * @hsdev:       Hub device instance.
 109 *
 110 * Used to clode hid device for sensor hub.
 111 */
 112 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev);
 113
 114 /* Registration functions */
 115
 116 /**
 117 * sensor_hub_register_callback() - Register client callbacks
 118 * @hsdev:       Hub device instance.
 119 * @usage_id:    Usage id of the client (E.g. 0x200076 for Gyro).
 120 * @usage_callback: Callback function storage
 121 *
 122 * Used to register callbacks by client processing drivers. Sensor
 123 * hub core driver will call these callbacks to offload processing
 124 * of data streams and notifications.
 125 */
 126 int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
 127                         u32 usage_id,
 128                         struct hid_sensor_hub_callbacks *usage_callback);
 129
 130 /**
 131 * sensor_hub_remove_callback() - Remove client callbacks
 132 * @hsdev:       Hub device instance.
 133 * @usage_id:    Usage id of the client (E.g. 0x200076 for Gyro).
 134 *
 135 * If there is a callback registred, this call will remove that
 136 * callbacks, so that it will stop data and event notifications.
 137 */
 138 int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
 139                         u32 usage_id);
 140
 141
 142 /* Hid sensor hub core interfaces */
 143
 144 /**
 145 * sensor_hub_input_get_attribute_info() - Get an attribute information
 146 * @hsdev:       Hub device instance.
 147 * @type:        Type of this attribute, input/output/feature
 148 * @usage_id:    Attribute usage id of parent physical device as per spec
 149 * @attr_usage_id:       Attribute usage id as per spec
 150 * @info:        return information about attribute after parsing report
 151 *
 152 * Parses report and returns the attribute information such as report id,
 153 * field index, units and exponet etc.
 154 */
 155 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
 156                         u8 type,
 157                         u32 usage_id, u32 attr_usage_id,
 158                         struct hid_sensor_hub_attribute_info *info);
 159
 160 /**
 161 * sensor_hub_input_attr_get_raw_value() - Synchronous read request
 162 * @hsdev:       Hub device instance.
 163 * @usage_id:    Attribute usage id of parent physical device as per spec
 164 * @attr_usage_id:       Attribute usage id as per spec
 165 * @report_id:   Report id to look for
 166 * @flag:      Synchronous or asynchronous read
 167 * @is_signed:   If true then fields < 32 bits will be sign-extended
 168 *
 169 * Issues a synchronous or asynchronous read request for an input attribute.
 170 * Returns data upto 32 bits.
 171 */
 172
 173 enum sensor_hub_read_flags {
 174         SENSOR_HUB_SYNC,
 175         SENSOR_HUB_ASYNC,
 176 };
 177
 178 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
 179                                         u32 usage_id,
 180                                         u32 attr_usage_id, u32 report_id,
 181                                         enum sensor_hub_read_flags flag,
 182                                         bool is_signed
 183 );
 184
 185 /**
 186 * sensor_hub_set_feature() - Feature set request
 187 * @hsdev:       Hub device instance.
 188 * @report_id:   Report id to look for
 189 * @field_index: Field index inside a report
 190 * @buffer_size: size of the buffer
 191 * @buffer:      buffer to use in the feature set
 192 *
 193 * Used to set a field in feature report. For example this can set polling
 194 * interval, sensitivity, activate/deactivate state.
 195 */
 196 int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 197                            u32 field_index, int buffer_size, void *buffer);
 198
 199 /**
 200 * sensor_hub_get_feature() - Feature get request
 201 * @hsdev:       Hub device instance.
 202 * @report_id:   Report id to look for
 203 * @field_index: Field index inside a report
 204 * @buffer_size: size of the buffer
 205 * @buffer:      buffer to copy output
 206 *
 207 * Used to get a field in feature report. For example this can get polling
 208 * interval, sensitivity, activate/deactivate state. On success it returns
 209 * number of bytes copied to buffer. On failure, it returns value < 0.
 210 */
 211 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 212                            u32 field_index, int buffer_size, void *buffer);
 213
 214 /* hid-sensor-attributes */
 215
 216 /* Common hid sensor iio structure */
 217 struct hid_sensor_common {
 218         struct hid_sensor_hub_device *hsdev;
 219         struct platform_device *pdev;
 220         unsigned usage_id;
 221         atomic_t data_ready;
 222         atomic_t user_requested_state;
 223         atomic_t runtime_pm_enable;
 224         int poll_interval;
 225         int raw_hystersis;
 226         int latency_ms;
 227         struct iio_trigger *trigger;
 228         int timestamp_ns_scale;
 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;
 233         struct hid_sensor_hub_attribute_info report_latency;
 234         struct work_struct work;
 235 };
 236
 237 /* Convert from hid unit expo to regular exponent */
 238 static inline int hid_sensor_convert_exponent(int unit_expo)
 239 {
 240         if (unit_expo < 0x08)
 241                 return unit_expo;
 242         else if (unit_expo <= 0x0f)
 243                 return -(0x0f-unit_expo+1);
 244         else
 245                 return 0;
 246 }
 247
 248 int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev,
 249                                         u32 usage_id,
 250                                         struct hid_sensor_common *st);
 251 int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st,
 252                                         int val1, int val2);
 253 int hid_sensor_read_raw_hyst_value(struct hid_sensor_common *st,
 254                                         int *val1, int *val2);
 255 int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st,
 256                                         int val1, int val2);
 257 int hid_sensor_read_samp_freq_value(struct hid_sensor_common *st,
 258                                         int *val1, int *val2);
 259
 260 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
 261                                 u32 report_id, int field_index, u32 usage_id);
 262
 263 int hid_sensor_format_scale(u32 usage_id,
 264                             struct hid_sensor_hub_attribute_info *attr_info,
 265                             int *val0, int *val1);
 266
 267 s32 hid_sensor_read_poll_value(struct hid_sensor_common *st);
 268
 269 int64_t hid_sensor_convert_timestamp(struct hid_sensor_common *st,
 270                                      int64_t raw_value);
 271 bool hid_sensor_batch_mode_supported(struct hid_sensor_common *st);
 272 int hid_sensor_set_report_latency(struct hid_sensor_common *st, int latency);
 273 int hid_sensor_get_report_latency(struct hid_sensor_common *st);
 274
 275 #endif