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/interrupt.h> 10 #include <linux/irq.h> 11 #include <linux/slab.h> 12 #include <linux/delay.h> 13 #include <linux/hid-sensor-hub.h> 14 #include <linux/iio/iio.h> 15 #include <linux/iio/sysfs.h> 16 #include <linux/iio/buffer.h> 17 #include "../common/hid-sensors/hid-sensor-trigger.h" 18 19 #define CHANNEL_SCAN_INDEX_PRESENCE 0 20 21 struct prox_state { 22 struct hid_sensor_hub_callbacks callbacks; 23 struct hid_sensor_common common_attributes; 24 struct hid_sensor_hub_attribute_info prox_attr; 25 u32 human_presence; 26 }; 27 28 /* Channel definitions */ 29 static const struct iio_chan_spec prox_channels[] = { 30 { 31 .type = IIO_PROXIMITY, 32 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 33 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 34 BIT(IIO_CHAN_INFO_SCALE) | 35 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 36 BIT(IIO_CHAN_INFO_HYSTERESIS), 37 .scan_index = CHANNEL_SCAN_INDEX_PRESENCE, 38 } 39 }; 40 41 /* Adjust channel real bits based on report descriptor */ 42 static void prox_adjust_channel_bit_mask(struct iio_chan_spec *channels, 43 int channel, int size) 44 { 45 channels[channel].scan_type.sign = 's'; 46 /* Real storage bits will change based on the report desc. */ 47 channels[channel].scan_type.realbits = size * 8; 48 /* Maximum size of a sample to capture is u32 */ 49 channels[channel].scan_type.storagebits = sizeof(u32) * 8; 50 } 51 52 /* Channel read_raw handler */ 53 static int prox_read_raw(struct iio_dev *indio_dev, 54 struct iio_chan_spec const *chan, 55 int *val, int *val2, 56 long mask) 57 { 58 struct prox_state *prox_state = iio_priv(indio_dev); 59 int report_id = -1; 60 u32 address; 61 int ret_type; 62 s32 min; 63 64 *val = 0; 65 *val2 = 0; 66 switch (mask) { 67 case IIO_CHAN_INFO_RAW: 68 switch (chan->scan_index) { 69 case CHANNEL_SCAN_INDEX_PRESENCE: 70 report_id = prox_state->prox_attr.report_id; 71 min = prox_state->prox_attr.logical_minimum; 72 address = HID_USAGE_SENSOR_HUMAN_PRESENCE; 73 break; 74 default: 75 report_id = -1; 76 break; 77 } 78 if (report_id >= 0) { 79 hid_sensor_power_state(&prox_state->common_attributes, 80 true); 81 *val = sensor_hub_input_attr_get_raw_value( 82 prox_state->common_attributes.hsdev, 83 HID_USAGE_SENSOR_PROX, address, 84 report_id, 85 SENSOR_HUB_SYNC, 86 min < 0); 87 hid_sensor_power_state(&prox_state->common_attributes, 88 false); 89 } else { 90 *val = 0; 91 return -EINVAL; 92 } 93 ret_type = IIO_VAL_INT; 94 break; 95 case IIO_CHAN_INFO_SCALE: 96 *val = prox_state->prox_attr.units; 97 ret_type = IIO_VAL_INT; 98 break; 99 case IIO_CHAN_INFO_OFFSET: 100 *val = hid_sensor_convert_exponent( 101 prox_state->prox_attr.unit_expo); 102 ret_type = IIO_VAL_INT; 103 break; 104 case IIO_CHAN_INFO_SAMP_FREQ: 105 ret_type = hid_sensor_read_samp_freq_value( 106 &prox_state->common_attributes, val, val2); 107 break; 108 case IIO_CHAN_INFO_HYSTERESIS: 109 ret_type = hid_sensor_read_raw_hyst_value( 110 &prox_state->common_attributes, val, val2); 111 break; 112 default: 113 ret_type = -EINVAL; 114 break; 115 } 116 117 return ret_type; 118 } 119 120 /* Channel write_raw handler */ 121 static int prox_write_raw(struct iio_dev *indio_dev, 122 struct iio_chan_spec const *chan, 123 int val, 124 int val2, 125 long mask) 126 { 127 struct prox_state *prox_state = iio_priv(indio_dev); 128 int ret = 0; 129 130 switch (mask) { 131 case IIO_CHAN_INFO_SAMP_FREQ: 132 ret = hid_sensor_write_samp_freq_value( 133 &prox_state->common_attributes, val, val2); 134 break; 135 case IIO_CHAN_INFO_HYSTERESIS: 136 ret = hid_sensor_write_raw_hyst_value( 137 &prox_state->common_attributes, val, val2); 138 break; 139 default: 140 ret = -EINVAL; 141 } 142 143 return ret; 144 } 145 146 static const struct iio_info prox_info = { 147 .read_raw = &prox_read_raw, 148 .write_raw = &prox_write_raw, 149 }; 150 151 /* Function to push data to buffer */ 152 static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data, 153 int len) 154 { 155 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); 156 iio_push_to_buffers(indio_dev, data); 157 } 158 159 /* Callback handler to send event after all samples are received and captured */ 160 static int prox_proc_event(struct hid_sensor_hub_device *hsdev, 161 unsigned usage_id, 162 void *priv) 163 { 164 struct iio_dev *indio_dev = platform_get_drvdata(priv); 165 struct prox_state *prox_state = iio_priv(indio_dev); 166 167 dev_dbg(&indio_dev->dev, "prox_proc_event\n"); 168 if (atomic_read(&prox_state->common_attributes.data_ready)) 169 hid_sensor_push_data(indio_dev, 170 &prox_state->human_presence, 171 sizeof(prox_state->human_presence)); 172 173 return 0; 174 } 175 176 /* Capture samples in local storage */ 177 static int prox_capture_sample(struct hid_sensor_hub_device *hsdev, 178 unsigned usage_id, 179 size_t raw_len, char *raw_data, 180 void *priv) 181 { 182 struct iio_dev *indio_dev = platform_get_drvdata(priv); 183 struct prox_state *prox_state = iio_priv(indio_dev); 184 int ret = -EINVAL; 185 186 switch (usage_id) { 187 case HID_USAGE_SENSOR_HUMAN_PRESENCE: 188 prox_state->human_presence = *(u32 *)raw_data; 189 ret = 0; 190 break; 191 default: 192 break; 193 } 194 195 return ret; 196 } 197 198 /* Parse report which is specific to an usage id*/ 199 static int prox_parse_report(struct platform_device *pdev, 200 struct hid_sensor_hub_device *hsdev, 201 struct iio_chan_spec *channels, 202 unsigned usage_id, 203 struct prox_state *st) 204 { 205 int ret; 206 207 ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT, 208 usage_id, 209 HID_USAGE_SENSOR_HUMAN_PRESENCE, 210 &st->prox_attr); 211 if (ret < 0) 212 return ret; 213 prox_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESENCE, 214 st->prox_attr.size); 215 216 dev_dbg(&pdev->dev, "prox %x:%x\n", st->prox_attr.index, 217 st->prox_attr.report_id); 218 219 /* Set Sensitivity field ids, when there is no individual modifier */ 220 if (st->common_attributes.sensitivity.index < 0) { 221 sensor_hub_input_get_attribute_info(hsdev, 222 HID_FEATURE_REPORT, usage_id, 223 HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS | 224 HID_USAGE_SENSOR_DATA_PRESENCE, 225 &st->common_attributes.sensitivity); 226 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n", 227 st->common_attributes.sensitivity.index, 228 st->common_attributes.sensitivity.report_id); 229 } 230 if (st->common_attributes.sensitivity.index < 0) 231 sensor_hub_input_get_attribute_info(hsdev, 232 HID_FEATURE_REPORT, usage_id, 233 HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS | 234 HID_USAGE_SENSOR_HUMAN_PRESENCE, 235 &st->common_attributes.sensitivity); 236 237 return ret; 238 } 239 240 /* Function to initialize the processing for usage id */ 241 static int hid_prox_probe(struct platform_device *pdev) 242 { 243 int ret = 0; 244 static const char *name = "prox"; 245 struct iio_dev *indio_dev; 246 struct prox_state *prox_state; 247 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 248 249 indio_dev = devm_iio_device_alloc(&pdev->dev, 250 sizeof(struct prox_state)); 251 if (!indio_dev) 252 return -ENOMEM; 253 platform_set_drvdata(pdev, indio_dev); 254 255 prox_state = iio_priv(indio_dev); 256 prox_state->common_attributes.hsdev = hsdev; 257 prox_state->common_attributes.pdev = pdev; 258 259 ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_PROX, 260 &prox_state->common_attributes); 261 if (ret) { 262 dev_err(&pdev->dev, "failed to setup common attributes\n"); 263 return ret; 264 } 265 266 indio_dev->channels = kmemdup(prox_channels, sizeof(prox_channels), 267 GFP_KERNEL); 268 if (!indio_dev->channels) { 269 dev_err(&pdev->dev, "failed to duplicate channels\n"); 270 return -ENOMEM; 271 } 272 273 ret = prox_parse_report(pdev, hsdev, 274 (struct iio_chan_spec *)indio_dev->channels, 275 HID_USAGE_SENSOR_PROX, prox_state); 276 if (ret) { 277 dev_err(&pdev->dev, "failed to setup attributes\n"); 278 goto error_free_dev_mem; 279 } 280 281 indio_dev->num_channels = ARRAY_SIZE(prox_channels); 282 indio_dev->info = &prox_info; 283 indio_dev->name = name; 284 indio_dev->modes = INDIO_DIRECT_MODE; 285 286 atomic_set(&prox_state->common_attributes.data_ready, 0); 287 288 ret = hid_sensor_setup_trigger(indio_dev, name, 289 &prox_state->common_attributes); 290 if (ret) { 291 dev_err(&pdev->dev, "trigger setup failed\n"); 292 goto error_free_dev_mem; 293 } 294 295 ret = iio_device_register(indio_dev); 296 if (ret) { 297 dev_err(&pdev->dev, "device register failed\n"); 298 goto error_remove_trigger; 299 } 300 301 prox_state->callbacks.send_event = prox_proc_event; 302 prox_state->callbacks.capture_sample = prox_capture_sample; 303 prox_state->callbacks.pdev = pdev; 304 ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PROX, 305 &prox_state->callbacks); 306 if (ret < 0) { 307 dev_err(&pdev->dev, "callback reg failed\n"); 308 goto error_iio_unreg; 309 } 310 311 return ret; 312 313 error_iio_unreg: 314 iio_device_unregister(indio_dev); 315 error_remove_trigger: 316 hid_sensor_remove_trigger(indio_dev, &prox_state->common_attributes); 317 error_free_dev_mem: 318 kfree(indio_dev->channels); 319 return ret; 320 } 321 322 /* Function to deinitialize the processing for usage id */ 323 static int hid_prox_remove(struct platform_device *pdev) 324 { 325 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 326 struct iio_dev *indio_dev = platform_get_drvdata(pdev); 327 struct prox_state *prox_state = iio_priv(indio_dev); 328 329 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PROX); 330 iio_device_unregister(indio_dev); 331 hid_sensor_remove_trigger(indio_dev, &prox_state->common_attributes); 332 kfree(indio_dev->channels); 333 334 return 0; 335 } 336 337 static const struct platform_device_id hid_prox_ids[] = { 338 { 339 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ 340 .name = "HID-SENSOR-200011", 341 }, 342 { /* sentinel */ } 343 }; 344 MODULE_DEVICE_TABLE(platform, hid_prox_ids); 345 346 static struct platform_driver hid_prox_platform_driver = { 347 .id_table = hid_prox_ids, 348 .driver = { 349 .name = KBUILD_MODNAME, 350 .pm = &hid_sensor_pm_ops, 351 }, 352 .probe = hid_prox_probe, 353 .remove = hid_prox_remove, 354 }; 355 module_platform_driver(hid_prox_platform_driver); 356 357 MODULE_DESCRIPTION("HID Sensor Proximity"); 358 MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>"); 359 MODULE_LICENSE("GPL"); 360