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 18 struct 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 28 static const u32 prox_sensitivity_addresses[] = { 29 HID_USAGE_SENSOR_HUMAN_PRESENCE, 30 HID_USAGE_SENSOR_DATA_PRESENCE, 31 }; 32 33 /* Channel definitions */ 34 static 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 */ 47 static 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 */ 58 static 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 struct hid_sensor_hub_device *hsdev; 65 int report_id = -1; 66 u32 address; 67 int ret_type; 68 s32 min; 69 70 *val = 0; 71 *val2 = 0; 72 switch (mask) { 73 case IIO_CHAN_INFO_RAW: 74 switch (chan->scan_index) { 75 case CHANNEL_SCAN_INDEX_PRESENCE: 76 report_id = prox_state->prox_attr.report_id; 77 min = prox_state->prox_attr.logical_minimum; 78 address = HID_USAGE_SENSOR_HUMAN_PRESENCE; 79 hsdev = prox_state->common_attributes.hsdev; 80 break; 81 default: 82 report_id = -1; 83 break; 84 } 85 if (report_id >= 0) { 86 hid_sensor_power_state(&prox_state->common_attributes, 87 true); 88 *val = sensor_hub_input_attr_get_raw_value( 89 hsdev, hsdev->usage, address, report_id, 90 SENSOR_HUB_SYNC, min < 0); 91 hid_sensor_power_state(&prox_state->common_attributes, 92 false); 93 } else { 94 *val = 0; 95 return -EINVAL; 96 } 97 ret_type = IIO_VAL_INT; 98 break; 99 case IIO_CHAN_INFO_SCALE: 100 *val = prox_state->scale_pre_decml; 101 *val2 = prox_state->scale_post_decml; 102 ret_type = prox_state->scale_precision; 103 break; 104 case IIO_CHAN_INFO_OFFSET: 105 *val = hid_sensor_convert_exponent( 106 prox_state->prox_attr.unit_expo); 107 ret_type = IIO_VAL_INT; 108 break; 109 case IIO_CHAN_INFO_SAMP_FREQ: 110 ret_type = hid_sensor_read_samp_freq_value( 111 &prox_state->common_attributes, val, val2); 112 break; 113 case IIO_CHAN_INFO_HYSTERESIS: 114 ret_type = hid_sensor_read_raw_hyst_value( 115 &prox_state->common_attributes, val, val2); 116 break; 117 default: 118 ret_type = -EINVAL; 119 break; 120 } 121 122 return ret_type; 123 } 124 125 /* Channel write_raw handler */ 126 static int prox_write_raw(struct iio_dev *indio_dev, 127 struct iio_chan_spec const *chan, 128 int val, 129 int val2, 130 long mask) 131 { 132 struct prox_state *prox_state = iio_priv(indio_dev); 133 int ret = 0; 134 135 switch (mask) { 136 case IIO_CHAN_INFO_SAMP_FREQ: 137 ret = hid_sensor_write_samp_freq_value( 138 &prox_state->common_attributes, val, val2); 139 break; 140 case IIO_CHAN_INFO_HYSTERESIS: 141 ret = hid_sensor_write_raw_hyst_value( 142 &prox_state->common_attributes, val, val2); 143 break; 144 default: 145 ret = -EINVAL; 146 } 147 148 return ret; 149 } 150 151 static const struct iio_info prox_info = { 152 .read_raw = &prox_read_raw, 153 .write_raw = &prox_write_raw, 154 }; 155 156 /* Callback handler to send event after all samples are received and captured */ 157 static int prox_proc_event(struct hid_sensor_hub_device *hsdev, 158 unsigned usage_id, 159 void *priv) 160 { 161 struct iio_dev *indio_dev = platform_get_drvdata(priv); 162 struct prox_state *prox_state = iio_priv(indio_dev); 163 164 dev_dbg(&indio_dev->dev, "prox_proc_event\n"); 165 if (atomic_read(&prox_state->common_attributes.data_ready)) { 166 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); 167 iio_push_to_buffers(indio_dev, &prox_state->human_presence); 168 } 169 170 return 0; 171 } 172 173 /* Capture samples in local storage */ 174 static int prox_capture_sample(struct hid_sensor_hub_device *hsdev, 175 unsigned usage_id, 176 size_t raw_len, char *raw_data, 177 void *priv) 178 { 179 struct iio_dev *indio_dev = platform_get_drvdata(priv); 180 struct prox_state *prox_state = iio_priv(indio_dev); 181 int ret = -EINVAL; 182 183 switch (usage_id) { 184 case HID_USAGE_SENSOR_HUMAN_PRESENCE: 185 switch (raw_len) { 186 case 1: 187 prox_state->human_presence = *(u8 *)raw_data; 188 return 0; 189 case 4: 190 prox_state->human_presence = *(u32 *)raw_data; 191 return 0; 192 default: 193 break; 194 } 195 break; 196 } 197 198 return ret; 199 } 200 201 /* Parse report which is specific to an usage id*/ 202 static int prox_parse_report(struct platform_device *pdev, 203 struct hid_sensor_hub_device *hsdev, 204 struct iio_chan_spec *channels, 205 unsigned usage_id, 206 struct prox_state *st) 207 { 208 int ret; 209 210 ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT, 211 usage_id, 212 HID_USAGE_SENSOR_HUMAN_PRESENCE, 213 &st->prox_attr); 214 if (ret < 0) 215 return ret; 216 prox_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESENCE, 217 st->prox_attr.size); 218 219 dev_dbg(&pdev->dev, "prox %x:%x\n", st->prox_attr.index, 220 st->prox_attr.report_id); 221 222 return ret; 223 } 224 225 /* Function to initialize the processing for usage id */ 226 static int hid_prox_probe(struct platform_device *pdev) 227 { 228 struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev); 229 int ret = 0; 230 static const char *name = "prox"; 231 struct iio_dev *indio_dev; 232 struct prox_state *prox_state; 233 234 indio_dev = devm_iio_device_alloc(&pdev->dev, 235 sizeof(struct prox_state)); 236 if (!indio_dev) 237 return -ENOMEM; 238 platform_set_drvdata(pdev, indio_dev); 239 240 prox_state = iio_priv(indio_dev); 241 prox_state->common_attributes.hsdev = hsdev; 242 prox_state->common_attributes.pdev = pdev; 243 244 ret = hid_sensor_parse_common_attributes(hsdev, hsdev->usage, 245 &prox_state->common_attributes, 246 prox_sensitivity_addresses, 247 ARRAY_SIZE(prox_sensitivity_addresses)); 248 if (ret) { 249 dev_err(&pdev->dev, "failed to setup common attributes\n"); 250 return ret; 251 } 252 253 indio_dev->channels = devm_kmemdup(&pdev->dev, prox_channels, 254 sizeof(prox_channels), GFP_KERNEL); 255 if (!indio_dev->channels) { 256 dev_err(&pdev->dev, "failed to duplicate channels\n"); 257 return -ENOMEM; 258 } 259 260 ret = prox_parse_report(pdev, hsdev, 261 (struct iio_chan_spec *)indio_dev->channels, 262 hsdev->usage, prox_state); 263 if (ret) { 264 dev_err(&pdev->dev, "failed to setup attributes\n"); 265 return ret; 266 } 267 268 indio_dev->num_channels = ARRAY_SIZE(prox_channels); 269 indio_dev->info = &prox_info; 270 indio_dev->name = name; 271 indio_dev->modes = INDIO_DIRECT_MODE; 272 273 atomic_set(&prox_state->common_attributes.data_ready, 0); 274 275 ret = hid_sensor_setup_trigger(indio_dev, name, 276 &prox_state->common_attributes); 277 if (ret) { 278 dev_err(&pdev->dev, "trigger setup failed\n"); 279 return ret; 280 } 281 282 ret = iio_device_register(indio_dev); 283 if (ret) { 284 dev_err(&pdev->dev, "device register failed\n"); 285 goto error_remove_trigger; 286 } 287 288 prox_state->callbacks.send_event = prox_proc_event; 289 prox_state->callbacks.capture_sample = prox_capture_sample; 290 prox_state->callbacks.pdev = pdev; 291 ret = sensor_hub_register_callback(hsdev, hsdev->usage, 292 &prox_state->callbacks); 293 if (ret < 0) { 294 dev_err(&pdev->dev, "callback reg failed\n"); 295 goto error_iio_unreg; 296 } 297 298 return ret; 299 300 error_iio_unreg: 301 iio_device_unregister(indio_dev); 302 error_remove_trigger: 303 hid_sensor_remove_trigger(indio_dev, &prox_state->common_attributes); 304 return ret; 305 } 306 307 /* Function to deinitialize the processing for usage id */ 308 static void hid_prox_remove(struct platform_device *pdev) 309 { 310 struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev); 311 struct iio_dev *indio_dev = platform_get_drvdata(pdev); 312 struct prox_state *prox_state = iio_priv(indio_dev); 313 314 sensor_hub_remove_callback(hsdev, hsdev->usage); 315 iio_device_unregister(indio_dev); 316 hid_sensor_remove_trigger(indio_dev, &prox_state->common_attributes); 317 } 318 319 static const struct platform_device_id hid_prox_ids[] = { 320 { 321 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ 322 .name = "HID-SENSOR-200011", 323 }, 324 { 325 /* Format: HID-SENSOR-tag-usage_id_in_hex_lowercase */ 326 .name = "HID-SENSOR-LISS-0226", 327 }, 328 { /* sentinel */ } 329 }; 330 MODULE_DEVICE_TABLE(platform, hid_prox_ids); 331 332 static struct platform_driver hid_prox_platform_driver = { 333 .id_table = hid_prox_ids, 334 .driver = { 335 .name = KBUILD_MODNAME, 336 .pm = &hid_sensor_pm_ops, 337 }, 338 .probe = hid_prox_probe, 339 .remove = hid_prox_remove, 340 }; 341 module_platform_driver(hid_prox_platform_driver); 342 343 MODULE_DESCRIPTION("HID Sensor Proximity"); 344 MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>"); 345 MODULE_LICENSE("GPL"); 346 MODULE_IMPORT_NS(IIO_HID); 347