include/linux/hid-sensor-hub.h

   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  */
  37 struct hid_sensor_hub_attribute_info {
  38         u32 usage_id;
  39         u32 attrib_id;
  40         s32 report_id;
  41         s32 index;
  42         s32 units;
  43         s32 unit_expo;
  44         s32 size;
  45         s32 logical_minimum;
  46         s32 logical_maximum;
  47 };
  48
  49 /**
  50  * struct hid_sensor_hub_device - Stores the hub instance data
  51  * @hdev:               Stores the hid instance.
  52  * @vendor_id:          Vendor id of hub device.
  53  * @product_id:         Product id of hub device.
  54  * @start_collection_index: Starting index for a phy type collection
  55  * @end_collection_index: Last index for a phy type collection
  56  */
  57 struct hid_sensor_hub_device {
  58         struct hid_device *hdev;
  59         u32 vendor_id;
  60         u32 product_id;
  61         int start_collection_index;
  62         int end_collection_index;
  63 };
  64
  65 /**
  66  * struct hid_sensor_hub_callbacks - Client callback functions
  67  * @pdev:               Platform device instance of the client driver.
  68  * @suspend:            Suspend callback.
  69  * @resume:             Resume callback.
  70  * @capture_sample:     Callback to get a sample.
  71  * @send_event:         Send notification to indicate all samples are
  72  *                      captured, process and send event
  73  */
  74 struct hid_sensor_hub_callbacks {
  75         struct platform_device *pdev;
  76         int (*suspend)(struct hid_sensor_hub_device *hsdev, void *priv);
  77         int (*resume)(struct hid_sensor_hub_device *hsdev, void *priv);
  78         int (*capture_sample)(struct hid_sensor_hub_device *hsdev,
  79                         u32 usage_id, size_t raw_len, char *raw_data,
  80                         void *priv);
  81         int (*send_event)(struct hid_sensor_hub_device *hsdev, u32 usage_id,
  82                          void *priv);
  83 };
  84
  85 /**
  86 * sensor_hub_device_open() - Open hub device
  87 * @hsdev:       Hub device instance.
  88 *
  89 * Used to open hid device for sensor hub.
  90 */
  91 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev);
  92
  93 /**
  94 * sensor_hub_device_clode() - Close hub device
  95 * @hsdev:       Hub device instance.
  96 *
  97 * Used to clode hid device for sensor hub.
  98 */
  99 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev);
 100
 101 /* Registration functions */
 102
 103 /**
 104 * sensor_hub_register_callback() - Register client callbacks
 105 * @hsdev:       Hub device instance.
 106 * @usage_id:    Usage id of the client (E.g. 0x200076 for Gyro).
 107 * @usage_callback: Callback function storage
 108 *
 109 * Used to register callbacks by client processing drivers. Sensor
 110 * hub core driver will call these callbacks to offload processing
 111 * of data streams and notifications.
 112 */
 113 int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
 114                         u32 usage_id,
 115                         struct hid_sensor_hub_callbacks *usage_callback);
 116
 117 /**
 118 * sensor_hub_remove_callback() - Remove client callbacks
 119 * @hsdev:       Hub device instance.
 120 * @usage_id:    Usage id of the client (E.g. 0x200076 for Gyro).
 121 *
 122 * If there is a callback registred, this call will remove that
 123 * callbacks, so that it will stop data and event notifications.
 124 */
 125 int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
 126                         u32 usage_id);
 127
 128
 129 /* Hid sensor hub core interfaces */
 130
 131 /**
 132 * sensor_hub_input_get_attribute_info() - Get an attribute information
 133 * @hsdev:       Hub device instance.
 134 * @type:        Type of this attribute, input/output/feature
 135 * @usage_id:    Attribute usage id of parent physical device as per spec
 136 * @attr_usage_id:       Attribute usage id as per spec
 137 * @info:        return information about attribute after parsing report
 138 *
 139 * Parses report and returns the attribute information such as report id,
 140 * field index, units and exponet etc.
 141 */
 142 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
 143                         u8 type,
 144                         u32 usage_id, u32 attr_usage_id,
 145                         struct hid_sensor_hub_attribute_info *info);
 146
 147 /**
 148 * sensor_hub_input_attr_get_raw_value() - Synchronous read request
 149 * @usage_id:    Attribute usage id of parent physical device as per spec
 150 * @attr_usage_id:       Attribute usage id as per spec
 151 * @report_id:   Report id to look for
 152 *
 153 * Issues a synchronous read request for an input attribute. Returns
 154 * data upto 32 bits. Since client can get events, so this call should
 155 * not be used for data paths, this will impact performance.
 156 */
 157
 158 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
 159                         u32 usage_id,
 160                         u32 attr_usage_id, u32 report_id);
 161 /**
 162 * sensor_hub_set_feature() - Feature set request
 163 * @report_id:   Report id to look for
 164 * @field_index: Field index inside a report
 165 * @value:       Value to set
 166 *
 167 * Used to set a field in feature report. For example this can set polling
 168 * interval, sensitivity, activate/deactivate state.
 169 */
 170 int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 171                         u32 field_index, s32 value);
 172
 173 /**
 174 * sensor_hub_get_feature() - Feature get request
 175 * @report_id:   Report id to look for
 176 * @field_index: Field index inside a report
 177 * @value:       Place holder for return value
 178 *
 179 * Used to get a field in feature report. For example this can get polling
 180 * interval, sensitivity, activate/deactivate state.
 181 */
 182 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 183                         u32 field_index, s32 *value);
 184
 185 /* hid-sensor-attributes */
 186
 187 /* Common hid sensor iio structure */
 188 struct hid_sensor_common {
 189         struct hid_sensor_hub_device *hsdev;
 190         struct platform_device *pdev;
 191         unsigned usage_id;
 192         atomic_t data_ready;
 193         struct iio_trigger *trigger;
 194         struct hid_sensor_hub_attribute_info poll;
 195         struct hid_sensor_hub_attribute_info report_state;
 196         struct hid_sensor_hub_attribute_info power_state;
 197         struct hid_sensor_hub_attribute_info sensitivity;
 198 };
 199
 200 /* Convert from hid unit expo to regular exponent */
 201 static inline int hid_sensor_convert_exponent(int unit_expo)
 202 {
 203         if (unit_expo < 0x08)
 204                 return unit_expo;
 205         else if (unit_expo <= 0x0f)
 206                 return -(0x0f-unit_expo+1);
 207         else
 208                 return 0;
 209 }
 210
 211 int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev,
 212                                         u32 usage_id,
 213                                         struct hid_sensor_common *st);
 214 int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st,
 215                                         int val1, int val2);
 216 int hid_sensor_read_raw_hyst_value(struct hid_sensor_common *st,
 217                                         int *val1, int *val2);
 218 int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st,
 219                                         int val1, int val2);
 220 int hid_sensor_read_samp_freq_value(struct hid_sensor_common *st,
 221                                         int *val1, int *val2);
 222
 223 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
 224                                 u32 report_id, int field_index, u32 usage_id);
 225
 226 int hid_sensor_format_scale(u32 usage_id,
 227                             struct hid_sensor_hub_attribute_info *attr_info,
 228                             int *val0, int *val1);
 229
 230 s32 hid_sensor_read_poll_value(struct hid_sensor_common *st);
 231
 232 #endif