hid-sensor-prox.c (9234B)
1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * HID Sensors Driver 4 * Copyright (c) 2014, Intel Corporation. 5 */ 6#include <linux/device.h> 7#include <linux/platform_device.h> 8#include <linux/module.h> 9#include <linux/mod_devicetable.h> 10#include <linux/slab.h> 11#include <linux/hid-sensor-hub.h> 12#include <linux/iio/iio.h> 13#include <linux/iio/buffer.h> 14#include "../common/hid-sensors/hid-sensor-trigger.h" 15 16#define CHANNEL_SCAN_INDEX_PRESENCE 0 17 18struct prox_state { 19 struct hid_sensor_hub_callbacks callbacks; 20 struct hid_sensor_common common_attributes; 21 struct hid_sensor_hub_attribute_info prox_attr; 22 u32 human_presence; 23 int scale_pre_decml; 24 int scale_post_decml; 25 int scale_precision; 26}; 27 28static const u32 prox_sensitivity_addresses[] = { 29 HID_USAGE_SENSOR_HUMAN_PRESENCE, 30 HID_USAGE_SENSOR_DATA_PRESENCE, 31}; 32 33/* Channel definitions */ 34static const struct iio_chan_spec prox_channels[] = { 35 { 36 .type = IIO_PROXIMITY, 37 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 38 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 39 BIT(IIO_CHAN_INFO_SCALE) | 40 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 41 BIT(IIO_CHAN_INFO_HYSTERESIS), 42 .scan_index = CHANNEL_SCAN_INDEX_PRESENCE, 43 } 44}; 45 46/* Adjust channel real bits based on report descriptor */ 47static void prox_adjust_channel_bit_mask(struct iio_chan_spec *channels, 48 int channel, int size) 49{ 50 channels[channel].scan_type.sign = 's'; 51 /* Real storage bits will change based on the report desc. */ 52 channels[channel].scan_type.realbits = size * 8; 53 /* Maximum size of a sample to capture is u32 */ 54 channels[channel].scan_type.storagebits = sizeof(u32) * 8; 55} 56 57/* Channel read_raw handler */ 58static int prox_read_raw(struct iio_dev *indio_dev, 59 struct iio_chan_spec const *chan, 60 int *val, int *val2, 61 long mask) 62{ 63 struct prox_state *prox_state = iio_priv(indio_dev); 64 int report_id = -1; 65 u32 address; 66 int ret_type; 67 s32 min; 68 69 *val = 0; 70 *val2 = 0; 71 switch (mask) { 72 case IIO_CHAN_INFO_RAW: 73 switch (chan->scan_index) { 74 case CHANNEL_SCAN_INDEX_PRESENCE: 75 report_id = prox_state->prox_attr.report_id; 76 min = prox_state->prox_attr.logical_minimum; 77 address = HID_USAGE_SENSOR_HUMAN_PRESENCE; 78 break; 79 default: 80 report_id = -1; 81 break; 82 } 83 if (report_id >= 0) { 84 hid_sensor_power_state(&prox_state->common_attributes, 85 true); 86 *val = sensor_hub_input_attr_get_raw_value( 87 prox_state->common_attributes.hsdev, 88 HID_USAGE_SENSOR_PROX, address, 89 report_id, 90 SENSOR_HUB_SYNC, 91 min < 0); 92 hid_sensor_power_state(&prox_state->common_attributes, 93 false); 94 } else { 95 *val = 0; 96 return -EINVAL; 97 } 98 ret_type = IIO_VAL_INT; 99 break; 100 case IIO_CHAN_INFO_SCALE: 101 *val = prox_state->scale_pre_decml; 102 *val2 = prox_state->scale_post_decml; 103 ret_type = prox_state->scale_precision; 104 break; 105 case IIO_CHAN_INFO_OFFSET: 106 *val = hid_sensor_convert_exponent( 107 prox_state->prox_attr.unit_expo); 108 ret_type = IIO_VAL_INT; 109 break; 110 case IIO_CHAN_INFO_SAMP_FREQ: 111 ret_type = hid_sensor_read_samp_freq_value( 112 &prox_state->common_attributes, val, val2); 113 break; 114 case IIO_CHAN_INFO_HYSTERESIS: 115 ret_type = hid_sensor_read_raw_hyst_value( 116 &prox_state->common_attributes, val, val2); 117 break; 118 default: 119 ret_type = -EINVAL; 120 break; 121 } 122 123 return ret_type; 124} 125 126/* Channel write_raw handler */ 127static int prox_write_raw(struct iio_dev *indio_dev, 128 struct iio_chan_spec const *chan, 129 int val, 130 int val2, 131 long mask) 132{ 133 struct prox_state *prox_state = iio_priv(indio_dev); 134 int ret = 0; 135 136 switch (mask) { 137 case IIO_CHAN_INFO_SAMP_FREQ: 138 ret = hid_sensor_write_samp_freq_value( 139 &prox_state->common_attributes, val, val2); 140 break; 141 case IIO_CHAN_INFO_HYSTERESIS: 142 ret = hid_sensor_write_raw_hyst_value( 143 &prox_state->common_attributes, val, val2); 144 break; 145 default: 146 ret = -EINVAL; 147 } 148 149 return ret; 150} 151 152static const struct iio_info prox_info = { 153 .read_raw = &prox_read_raw, 154 .write_raw = &prox_write_raw, 155}; 156 157/* Function to push data to buffer */ 158static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data, 159 int len) 160{ 161 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); 162 iio_push_to_buffers(indio_dev, data); 163} 164 165/* Callback handler to send event after all samples are received and captured */ 166static int prox_proc_event(struct hid_sensor_hub_device *hsdev, 167 unsigned usage_id, 168 void *priv) 169{ 170 struct iio_dev *indio_dev = platform_get_drvdata(priv); 171 struct prox_state *prox_state = iio_priv(indio_dev); 172 173 dev_dbg(&indio_dev->dev, "prox_proc_event\n"); 174 if (atomic_read(&prox_state->common_attributes.data_ready)) 175 hid_sensor_push_data(indio_dev, 176 &prox_state->human_presence, 177 sizeof(prox_state->human_presence)); 178 179 return 0; 180} 181 182/* Capture samples in local storage */ 183static int prox_capture_sample(struct hid_sensor_hub_device *hsdev, 184 unsigned usage_id, 185 size_t raw_len, char *raw_data, 186 void *priv) 187{ 188 struct iio_dev *indio_dev = platform_get_drvdata(priv); 189 struct prox_state *prox_state = iio_priv(indio_dev); 190 int ret = -EINVAL; 191 192 switch (usage_id) { 193 case HID_USAGE_SENSOR_HUMAN_PRESENCE: 194 prox_state->human_presence = *(u32 *)raw_data; 195 ret = 0; 196 break; 197 default: 198 break; 199 } 200 201 return ret; 202} 203 204/* Parse report which is specific to an usage id*/ 205static int prox_parse_report(struct platform_device *pdev, 206 struct hid_sensor_hub_device *hsdev, 207 struct iio_chan_spec *channels, 208 unsigned usage_id, 209 struct prox_state *st) 210{ 211 int ret; 212 213 ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT, 214 usage_id, 215 HID_USAGE_SENSOR_HUMAN_PRESENCE, 216 &st->prox_attr); 217 if (ret < 0) 218 return ret; 219 prox_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESENCE, 220 st->prox_attr.size); 221 222 dev_dbg(&pdev->dev, "prox %x:%x\n", st->prox_attr.index, 223 st->prox_attr.report_id); 224 225 return ret; 226} 227 228/* Function to initialize the processing for usage id */ 229static int hid_prox_probe(struct platform_device *pdev) 230{ 231 int ret = 0; 232 static const char *name = "prox"; 233 struct iio_dev *indio_dev; 234 struct prox_state *prox_state; 235 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 236 237 indio_dev = devm_iio_device_alloc(&pdev->dev, 238 sizeof(struct prox_state)); 239 if (!indio_dev) 240 return -ENOMEM; 241 platform_set_drvdata(pdev, indio_dev); 242 243 prox_state = iio_priv(indio_dev); 244 prox_state->common_attributes.hsdev = hsdev; 245 prox_state->common_attributes.pdev = pdev; 246 247 ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_PROX, 248 &prox_state->common_attributes, 249 prox_sensitivity_addresses, 250 ARRAY_SIZE(prox_sensitivity_addresses)); 251 if (ret) { 252 dev_err(&pdev->dev, "failed to setup common attributes\n"); 253 return ret; 254 } 255 256 indio_dev->channels = devm_kmemdup(&pdev->dev, prox_channels, 257 sizeof(prox_channels), GFP_KERNEL); 258 if (!indio_dev->channels) { 259 dev_err(&pdev->dev, "failed to duplicate channels\n"); 260 return -ENOMEM; 261 } 262 263 ret = prox_parse_report(pdev, hsdev, 264 (struct iio_chan_spec *)indio_dev->channels, 265 HID_USAGE_SENSOR_PROX, prox_state); 266 if (ret) { 267 dev_err(&pdev->dev, "failed to setup attributes\n"); 268 return ret; 269 } 270 271 indio_dev->num_channels = ARRAY_SIZE(prox_channels); 272 indio_dev->info = &prox_info; 273 indio_dev->name = name; 274 indio_dev->modes = INDIO_DIRECT_MODE; 275 276 atomic_set(&prox_state->common_attributes.data_ready, 0); 277 278 ret = hid_sensor_setup_trigger(indio_dev, name, 279 &prox_state->common_attributes); 280 if (ret) { 281 dev_err(&pdev->dev, "trigger setup failed\n"); 282 return ret; 283 } 284 285 ret = iio_device_register(indio_dev); 286 if (ret) { 287 dev_err(&pdev->dev, "device register failed\n"); 288 goto error_remove_trigger; 289 } 290 291 prox_state->callbacks.send_event = prox_proc_event; 292 prox_state->callbacks.capture_sample = prox_capture_sample; 293 prox_state->callbacks.pdev = pdev; 294 ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PROX, 295 &prox_state->callbacks); 296 if (ret < 0) { 297 dev_err(&pdev->dev, "callback reg failed\n"); 298 goto error_iio_unreg; 299 } 300 301 return ret; 302 303error_iio_unreg: 304 iio_device_unregister(indio_dev); 305error_remove_trigger: 306 hid_sensor_remove_trigger(indio_dev, &prox_state->common_attributes); 307 return ret; 308} 309 310/* Function to deinitialize the processing for usage id */ 311static int hid_prox_remove(struct platform_device *pdev) 312{ 313 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 314 struct iio_dev *indio_dev = platform_get_drvdata(pdev); 315 struct prox_state *prox_state = iio_priv(indio_dev); 316 317 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PROX); 318 iio_device_unregister(indio_dev); 319 hid_sensor_remove_trigger(indio_dev, &prox_state->common_attributes); 320 321 return 0; 322} 323 324static const struct platform_device_id hid_prox_ids[] = { 325 { 326 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ 327 .name = "HID-SENSOR-200011", 328 }, 329 { /* sentinel */ } 330}; 331MODULE_DEVICE_TABLE(platform, hid_prox_ids); 332 333static struct platform_driver hid_prox_platform_driver = { 334 .id_table = hid_prox_ids, 335 .driver = { 336 .name = KBUILD_MODNAME, 337 .pm = &hid_sensor_pm_ops, 338 }, 339 .probe = hid_prox_probe, 340 .remove = hid_prox_remove, 341}; 342module_platform_driver(hid_prox_platform_driver); 343 344MODULE_DESCRIPTION("HID Sensor Proximity"); 345MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>"); 346MODULE_LICENSE("GPL"); 347MODULE_IMPORT_NS(IIO_HID);