1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * HID Sensors Driver 4 * Copyright (c) 2012, 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 enum { 17 CHANNEL_SCAN_INDEX_INTENSITY = 0, 18 CHANNEL_SCAN_INDEX_ILLUM = 1, 19 CHANNEL_SCAN_INDEX_MAX 20 }; 21 22 #define CHANNEL_SCAN_INDEX_TIMESTAMP CHANNEL_SCAN_INDEX_MAX 23 24 struct als_state { 25 struct hid_sensor_hub_callbacks callbacks; 26 struct hid_sensor_common common_attributes; 27 struct hid_sensor_hub_attribute_info als_illum; 28 struct { 29 u32 illum[CHANNEL_SCAN_INDEX_MAX]; 30 u64 timestamp __aligned(8); 31 } scan; 32 int scale_pre_decml; 33 int scale_post_decml; 34 int scale_precision; 35 int value_offset; 36 s64 timestamp; 37 }; 38 39 static const u32 als_sensitivity_addresses[] = { 40 HID_USAGE_SENSOR_DATA_LIGHT, 41 HID_USAGE_SENSOR_LIGHT_ILLUM, 42 }; 43 44 /* Channel definitions */ 45 static const struct iio_chan_spec als_channels[] = { 46 { 47 .type = IIO_INTENSITY, 48 .modified = 1, 49 .channel2 = IIO_MOD_LIGHT_BOTH, 50 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 51 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 52 BIT(IIO_CHAN_INFO_SCALE) | 53 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 54 BIT(IIO_CHAN_INFO_HYSTERESIS) | 55 BIT(IIO_CHAN_INFO_HYSTERESIS_RELATIVE), 56 .scan_index = CHANNEL_SCAN_INDEX_INTENSITY, 57 }, 58 { 59 .type = IIO_LIGHT, 60 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 61 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 62 BIT(IIO_CHAN_INFO_SCALE) | 63 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 64 BIT(IIO_CHAN_INFO_HYSTERESIS) | 65 BIT(IIO_CHAN_INFO_HYSTERESIS_RELATIVE), 66 .scan_index = CHANNEL_SCAN_INDEX_ILLUM, 67 }, 68 IIO_CHAN_SOFT_TIMESTAMP(CHANNEL_SCAN_INDEX_TIMESTAMP) 69 }; 70 71 /* Adjust channel real bits based on report descriptor */ 72 static void als_adjust_channel_bit_mask(struct iio_chan_spec *channels, 73 int channel, int size) 74 { 75 channels[channel].scan_type.sign = 's'; 76 /* Real storage bits will change based on the report desc. */ 77 channels[channel].scan_type.realbits = size * 8; 78 /* Maximum size of a sample to capture is u32 */ 79 channels[channel].scan_type.storagebits = sizeof(u32) * 8; 80 } 81 82 /* Channel read_raw handler */ 83 static int als_read_raw(struct iio_dev *indio_dev, 84 struct iio_chan_spec const *chan, 85 int *val, int *val2, 86 long mask) 87 { 88 struct als_state *als_state = iio_priv(indio_dev); 89 struct hid_sensor_hub_device *hsdev = als_state->common_attributes.hsdev; 90 int report_id = -1; 91 u32 address; 92 int ret_type; 93 s32 min; 94 95 *val = 0; 96 *val2 = 0; 97 switch (mask) { 98 case IIO_CHAN_INFO_RAW: 99 switch (chan->scan_index) { 100 case CHANNEL_SCAN_INDEX_INTENSITY: 101 case CHANNEL_SCAN_INDEX_ILLUM: 102 report_id = als_state->als_illum.report_id; 103 min = als_state->als_illum.logical_minimum; 104 address = HID_USAGE_SENSOR_LIGHT_ILLUM; 105 break; 106 default: 107 report_id = -1; 108 break; 109 } 110 if (report_id >= 0) { 111 hid_sensor_power_state(&als_state->common_attributes, 112 true); 113 *val = sensor_hub_input_attr_get_raw_value( 114 hsdev, hsdev->usage, address, report_id, 115 SENSOR_HUB_SYNC, min < 0); 116 hid_sensor_power_state(&als_state->common_attributes, 117 false); 118 } else { 119 *val = 0; 120 return -EINVAL; 121 } 122 ret_type = IIO_VAL_INT; 123 break; 124 case IIO_CHAN_INFO_SCALE: 125 *val = als_state->scale_pre_decml; 126 *val2 = als_state->scale_post_decml; 127 ret_type = als_state->scale_precision; 128 break; 129 case IIO_CHAN_INFO_OFFSET: 130 *val = als_state->value_offset; 131 ret_type = IIO_VAL_INT; 132 break; 133 case IIO_CHAN_INFO_SAMP_FREQ: 134 ret_type = hid_sensor_read_samp_freq_value( 135 &als_state->common_attributes, val, val2); 136 break; 137 case IIO_CHAN_INFO_HYSTERESIS: 138 ret_type = hid_sensor_read_raw_hyst_value( 139 &als_state->common_attributes, val, val2); 140 break; 141 case IIO_CHAN_INFO_HYSTERESIS_RELATIVE: 142 ret_type = hid_sensor_read_raw_hyst_rel_value( 143 &als_state->common_attributes, val, val2); 144 break; 145 default: 146 ret_type = -EINVAL; 147 break; 148 } 149 150 return ret_type; 151 } 152 153 /* Channel write_raw handler */ 154 static int als_write_raw(struct iio_dev *indio_dev, 155 struct iio_chan_spec const *chan, 156 int val, 157 int val2, 158 long mask) 159 { 160 struct als_state *als_state = iio_priv(indio_dev); 161 int ret = 0; 162 163 switch (mask) { 164 case IIO_CHAN_INFO_SAMP_FREQ: 165 ret = hid_sensor_write_samp_freq_value( 166 &als_state->common_attributes, val, val2); 167 break; 168 case IIO_CHAN_INFO_HYSTERESIS: 169 ret = hid_sensor_write_raw_hyst_value( 170 &als_state->common_attributes, val, val2); 171 break; 172 case IIO_CHAN_INFO_HYSTERESIS_RELATIVE: 173 ret = hid_sensor_write_raw_hyst_rel_value( 174 &als_state->common_attributes, val, val2); 175 break; 176 default: 177 ret = -EINVAL; 178 } 179 180 return ret; 181 } 182 183 static const struct iio_info als_info = { 184 .read_raw = &als_read_raw, 185 .write_raw = &als_write_raw, 186 }; 187 188 /* Callback handler to send event after all samples are received and captured */ 189 static int als_proc_event(struct hid_sensor_hub_device *hsdev, 190 unsigned usage_id, 191 void *priv) 192 { 193 struct iio_dev *indio_dev = platform_get_drvdata(priv); 194 struct als_state *als_state = iio_priv(indio_dev); 195 196 dev_dbg(&indio_dev->dev, "als_proc_event\n"); 197 if (atomic_read(&als_state->common_attributes.data_ready)) { 198 if (!als_state->timestamp) 199 als_state->timestamp = iio_get_time_ns(indio_dev); 200 201 iio_push_to_buffers_with_timestamp(indio_dev, &als_state->scan, 202 als_state->timestamp); 203 als_state->timestamp = 0; 204 } 205 206 return 0; 207 } 208 209 /* Capture samples in local storage */ 210 static int als_capture_sample(struct hid_sensor_hub_device *hsdev, 211 unsigned usage_id, 212 size_t raw_len, char *raw_data, 213 void *priv) 214 { 215 struct iio_dev *indio_dev = platform_get_drvdata(priv); 216 struct als_state *als_state = iio_priv(indio_dev); 217 int ret = -EINVAL; 218 u32 sample_data = *(u32 *)raw_data; 219 220 switch (usage_id) { 221 case HID_USAGE_SENSOR_LIGHT_ILLUM: 222 als_state->scan.illum[CHANNEL_SCAN_INDEX_INTENSITY] = sample_data; 223 als_state->scan.illum[CHANNEL_SCAN_INDEX_ILLUM] = sample_data; 224 ret = 0; 225 break; 226 case HID_USAGE_SENSOR_TIME_TIMESTAMP: 227 als_state->timestamp = hid_sensor_convert_timestamp(&als_state->common_attributes, 228 *(s64 *)raw_data); 229 break; 230 default: 231 break; 232 } 233 234 return ret; 235 } 236 237 /* Parse report which is specific to an usage id*/ 238 static int als_parse_report(struct platform_device *pdev, 239 struct hid_sensor_hub_device *hsdev, 240 struct iio_chan_spec *channels, 241 unsigned usage_id, 242 struct als_state *st) 243 { 244 int ret; 245 246 ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT, 247 usage_id, 248 HID_USAGE_SENSOR_LIGHT_ILLUM, 249 &st->als_illum); 250 if (ret < 0) 251 return ret; 252 als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_INTENSITY, 253 st->als_illum.size); 254 als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_ILLUM, 255 st->als_illum.size); 256 257 dev_dbg(&pdev->dev, "als %x:%x\n", st->als_illum.index, 258 st->als_illum.report_id); 259 260 st->scale_precision = hid_sensor_format_scale(usage_id, &st->als_illum, 261 &st->scale_pre_decml, &st->scale_post_decml); 262 263 return ret; 264 } 265 266 /* Function to initialize the processing for usage id */ 267 static int hid_als_probe(struct platform_device *pdev) 268 { 269 int ret = 0; 270 static const char *name = "als"; 271 struct iio_dev *indio_dev; 272 struct als_state *als_state; 273 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 274 275 indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct als_state)); 276 if (!indio_dev) 277 return -ENOMEM; 278 platform_set_drvdata(pdev, indio_dev); 279 280 als_state = iio_priv(indio_dev); 281 als_state->common_attributes.hsdev = hsdev; 282 als_state->common_attributes.pdev = pdev; 283 284 ret = hid_sensor_parse_common_attributes(hsdev, 285 hsdev->usage, 286 &als_state->common_attributes, 287 als_sensitivity_addresses, 288 ARRAY_SIZE(als_sensitivity_addresses)); 289 if (ret) { 290 dev_err(&pdev->dev, "failed to setup common attributes\n"); 291 return ret; 292 } 293 294 indio_dev->channels = devm_kmemdup(&pdev->dev, als_channels, 295 sizeof(als_channels), GFP_KERNEL); 296 if (!indio_dev->channels) { 297 dev_err(&pdev->dev, "failed to duplicate channels\n"); 298 return -ENOMEM; 299 } 300 301 ret = als_parse_report(pdev, hsdev, 302 (struct iio_chan_spec *)indio_dev->channels, 303 hsdev->usage, 304 als_state); 305 if (ret) { 306 dev_err(&pdev->dev, "failed to setup attributes\n"); 307 return ret; 308 } 309 310 indio_dev->num_channels = 311 ARRAY_SIZE(als_channels); 312 indio_dev->info = &als_info; 313 indio_dev->name = name; 314 indio_dev->modes = INDIO_DIRECT_MODE; 315 316 atomic_set(&als_state->common_attributes.data_ready, 0); 317 318 ret = hid_sensor_setup_trigger(indio_dev, name, 319 &als_state->common_attributes); 320 if (ret < 0) { 321 dev_err(&pdev->dev, "trigger setup failed\n"); 322 return ret; 323 } 324 325 ret = iio_device_register(indio_dev); 326 if (ret) { 327 dev_err(&pdev->dev, "device register failed\n"); 328 goto error_remove_trigger; 329 } 330 331 als_state->callbacks.send_event = als_proc_event; 332 als_state->callbacks.capture_sample = als_capture_sample; 333 als_state->callbacks.pdev = pdev; 334 ret = sensor_hub_register_callback(hsdev, hsdev->usage, &als_state->callbacks); 335 if (ret < 0) { 336 dev_err(&pdev->dev, "callback reg failed\n"); 337 goto error_iio_unreg; 338 } 339 340 return ret; 341 342 error_iio_unreg: 343 iio_device_unregister(indio_dev); 344 error_remove_trigger: 345 hid_sensor_remove_trigger(indio_dev, &als_state->common_attributes); 346 return ret; 347 } 348 349 /* Function to deinitialize the processing for usage id */ 350 static int hid_als_remove(struct platform_device *pdev) 351 { 352 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 353 struct iio_dev *indio_dev = platform_get_drvdata(pdev); 354 struct als_state *als_state = iio_priv(indio_dev); 355 356 sensor_hub_remove_callback(hsdev, hsdev->usage); 357 iio_device_unregister(indio_dev); 358 hid_sensor_remove_trigger(indio_dev, &als_state->common_attributes); 359 360 return 0; 361 } 362 363 static const struct platform_device_id hid_als_ids[] = { 364 { 365 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ 366 .name = "HID-SENSOR-200041", 367 }, 368 { 369 /* Format: HID-SENSOR-custom_sensor_tag-usage_id_in_hex_lowercase */ 370 .name = "HID-SENSOR-LISS-0041", 371 }, 372 { /* sentinel */ } 373 }; 374 MODULE_DEVICE_TABLE(platform, hid_als_ids); 375 376 static struct platform_driver hid_als_platform_driver = { 377 .id_table = hid_als_ids, 378 .driver = { 379 .name = KBUILD_MODNAME, 380 .pm = &hid_sensor_pm_ops, 381 }, 382 .probe = hid_als_probe, 383 .remove = hid_als_remove, 384 }; 385 module_platform_driver(hid_als_platform_driver); 386 387 MODULE_DESCRIPTION("HID Sensor ALS"); 388 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>"); 389 MODULE_LICENSE("GPL"); 390 MODULE_IMPORT_NS(IIO_HID); 391