1 /* 2 * HID Sensors Driver 3 * Copyright (c) 2013, 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 * 17 */ 18 19 #include <linux/device.h> 20 #include <linux/platform_device.h> 21 #include <linux/module.h> 22 #include <linux/interrupt.h> 23 #include <linux/irq.h> 24 #include <linux/slab.h> 25 #include <linux/delay.h> 26 #include <linux/hid-sensor-hub.h> 27 #include <linux/iio/iio.h> 28 #include <linux/iio/sysfs.h> 29 #include <linux/iio/buffer.h> 30 #include <linux/iio/trigger_consumer.h> 31 #include <linux/iio/triggered_buffer.h> 32 #include "../common/hid-sensors/hid-sensor-trigger.h" 33 34 enum incl_3d_channel { 35 CHANNEL_SCAN_INDEX_X, 36 CHANNEL_SCAN_INDEX_Y, 37 CHANNEL_SCAN_INDEX_Z, 38 INCLI_3D_CHANNEL_MAX, 39 }; 40 41 struct incl_3d_state { 42 struct hid_sensor_hub_callbacks callbacks; 43 struct hid_sensor_common common_attributes; 44 struct hid_sensor_hub_attribute_info incl[INCLI_3D_CHANNEL_MAX]; 45 u32 incl_val[INCLI_3D_CHANNEL_MAX]; 46 int scale_pre_decml; 47 int scale_post_decml; 48 int scale_precision; 49 int value_offset; 50 }; 51 52 static const u32 incl_3d_addresses[INCLI_3D_CHANNEL_MAX] = { 53 HID_USAGE_SENSOR_ORIENT_TILT_X, 54 HID_USAGE_SENSOR_ORIENT_TILT_Y, 55 HID_USAGE_SENSOR_ORIENT_TILT_Z 56 }; 57 58 /* Channel definitions */ 59 static const struct iio_chan_spec incl_3d_channels[] = { 60 { 61 .type = IIO_INCLI, 62 .modified = 1, 63 .channel2 = IIO_MOD_X, 64 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 65 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 66 BIT(IIO_CHAN_INFO_SCALE) | 67 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 68 BIT(IIO_CHAN_INFO_HYSTERESIS), 69 .scan_index = CHANNEL_SCAN_INDEX_X, 70 }, { 71 .type = IIO_INCLI, 72 .modified = 1, 73 .channel2 = IIO_MOD_Y, 74 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 75 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 76 BIT(IIO_CHAN_INFO_SCALE) | 77 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 78 BIT(IIO_CHAN_INFO_HYSTERESIS), 79 .scan_index = CHANNEL_SCAN_INDEX_Y, 80 }, { 81 .type = IIO_INCLI, 82 .modified = 1, 83 .channel2 = IIO_MOD_Z, 84 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 85 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 86 BIT(IIO_CHAN_INFO_SCALE) | 87 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 88 BIT(IIO_CHAN_INFO_HYSTERESIS), 89 .scan_index = CHANNEL_SCAN_INDEX_Z, 90 } 91 }; 92 93 /* Adjust channel real bits based on report descriptor */ 94 static void incl_3d_adjust_channel_bit_mask(struct iio_chan_spec *chan, 95 int size) 96 { 97 chan->scan_type.sign = 's'; 98 /* Real storage bits will change based on the report desc. */ 99 chan->scan_type.realbits = size * 8; 100 /* Maximum size of a sample to capture is u32 */ 101 chan->scan_type.storagebits = sizeof(u32) * 8; 102 } 103 104 /* Channel read_raw handler */ 105 static int incl_3d_read_raw(struct iio_dev *indio_dev, 106 struct iio_chan_spec const *chan, 107 int *val, int *val2, 108 long mask) 109 { 110 struct incl_3d_state *incl_state = iio_priv(indio_dev); 111 int report_id = -1; 112 u32 address; 113 int ret_type; 114 115 *val = 0; 116 *val2 = 0; 117 switch (mask) { 118 case IIO_CHAN_INFO_RAW: 119 hid_sensor_power_state(&incl_state->common_attributes, true); 120 report_id = 121 incl_state->incl[chan->scan_index].report_id; 122 address = incl_3d_addresses[chan->scan_index]; 123 if (report_id >= 0) 124 *val = sensor_hub_input_attr_get_raw_value( 125 incl_state->common_attributes.hsdev, 126 HID_USAGE_SENSOR_INCLINOMETER_3D, address, 127 report_id, 128 SENSOR_HUB_SYNC); 129 else { 130 hid_sensor_power_state(&incl_state->common_attributes, 131 false); 132 return -EINVAL; 133 } 134 hid_sensor_power_state(&incl_state->common_attributes, false); 135 ret_type = IIO_VAL_INT; 136 break; 137 case IIO_CHAN_INFO_SCALE: 138 *val = incl_state->scale_pre_decml; 139 *val2 = incl_state->scale_post_decml; 140 ret_type = incl_state->scale_precision; 141 break; 142 case IIO_CHAN_INFO_OFFSET: 143 *val = incl_state->value_offset; 144 ret_type = IIO_VAL_INT; 145 break; 146 case IIO_CHAN_INFO_SAMP_FREQ: 147 ret_type = hid_sensor_read_samp_freq_value( 148 &incl_state->common_attributes, val, val2); 149 break; 150 case IIO_CHAN_INFO_HYSTERESIS: 151 ret_type = hid_sensor_read_raw_hyst_value( 152 &incl_state->common_attributes, val, val2); 153 break; 154 default: 155 ret_type = -EINVAL; 156 break; 157 } 158 159 return ret_type; 160 } 161 162 /* Channel write_raw handler */ 163 static int incl_3d_write_raw(struct iio_dev *indio_dev, 164 struct iio_chan_spec const *chan, 165 int val, 166 int val2, 167 long mask) 168 { 169 struct incl_3d_state *incl_state = iio_priv(indio_dev); 170 int ret; 171 172 switch (mask) { 173 case IIO_CHAN_INFO_SAMP_FREQ: 174 ret = hid_sensor_write_samp_freq_value( 175 &incl_state->common_attributes, val, val2); 176 break; 177 case IIO_CHAN_INFO_HYSTERESIS: 178 ret = hid_sensor_write_raw_hyst_value( 179 &incl_state->common_attributes, val, val2); 180 break; 181 default: 182 ret = -EINVAL; 183 } 184 185 return ret; 186 } 187 188 static const struct iio_info incl_3d_info = { 189 .driver_module = THIS_MODULE, 190 .read_raw = &incl_3d_read_raw, 191 .write_raw = &incl_3d_write_raw, 192 }; 193 194 /* Function to push data to buffer */ 195 static void hid_sensor_push_data(struct iio_dev *indio_dev, u8 *data, int len) 196 { 197 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); 198 iio_push_to_buffers(indio_dev, (u8 *)data); 199 } 200 201 /* Callback handler to send event after all samples are received and captured */ 202 static int incl_3d_proc_event(struct hid_sensor_hub_device *hsdev, 203 unsigned usage_id, 204 void *priv) 205 { 206 struct iio_dev *indio_dev = platform_get_drvdata(priv); 207 struct incl_3d_state *incl_state = iio_priv(indio_dev); 208 209 dev_dbg(&indio_dev->dev, "incl_3d_proc_event\n"); 210 if (atomic_read(&incl_state->common_attributes.data_ready)) 211 hid_sensor_push_data(indio_dev, 212 (u8 *)incl_state->incl_val, 213 sizeof(incl_state->incl_val)); 214 215 return 0; 216 } 217 218 /* Capture samples in local storage */ 219 static int incl_3d_capture_sample(struct hid_sensor_hub_device *hsdev, 220 unsigned usage_id, 221 size_t raw_len, char *raw_data, 222 void *priv) 223 { 224 struct iio_dev *indio_dev = platform_get_drvdata(priv); 225 struct incl_3d_state *incl_state = iio_priv(indio_dev); 226 int ret = 0; 227 228 switch (usage_id) { 229 case HID_USAGE_SENSOR_ORIENT_TILT_X: 230 incl_state->incl_val[CHANNEL_SCAN_INDEX_X] = *(u32 *)raw_data; 231 break; 232 case HID_USAGE_SENSOR_ORIENT_TILT_Y: 233 incl_state->incl_val[CHANNEL_SCAN_INDEX_Y] = *(u32 *)raw_data; 234 break; 235 case HID_USAGE_SENSOR_ORIENT_TILT_Z: 236 incl_state->incl_val[CHANNEL_SCAN_INDEX_Z] = *(u32 *)raw_data; 237 break; 238 default: 239 ret = -EINVAL; 240 break; 241 } 242 243 return ret; 244 } 245 246 /* Parse report which is specific to an usage id*/ 247 static int incl_3d_parse_report(struct platform_device *pdev, 248 struct hid_sensor_hub_device *hsdev, 249 struct iio_chan_spec *channels, 250 unsigned usage_id, 251 struct incl_3d_state *st) 252 { 253 int ret; 254 255 ret = sensor_hub_input_get_attribute_info(hsdev, 256 HID_INPUT_REPORT, 257 usage_id, 258 HID_USAGE_SENSOR_ORIENT_TILT_X, 259 &st->incl[CHANNEL_SCAN_INDEX_X]); 260 if (ret) 261 return ret; 262 incl_3d_adjust_channel_bit_mask(&channels[CHANNEL_SCAN_INDEX_X], 263 st->incl[CHANNEL_SCAN_INDEX_X].size); 264 265 ret = sensor_hub_input_get_attribute_info(hsdev, 266 HID_INPUT_REPORT, 267 usage_id, 268 HID_USAGE_SENSOR_ORIENT_TILT_Y, 269 &st->incl[CHANNEL_SCAN_INDEX_Y]); 270 if (ret) 271 return ret; 272 incl_3d_adjust_channel_bit_mask(&channels[CHANNEL_SCAN_INDEX_Y], 273 st->incl[CHANNEL_SCAN_INDEX_Y].size); 274 275 ret = sensor_hub_input_get_attribute_info(hsdev, 276 HID_INPUT_REPORT, 277 usage_id, 278 HID_USAGE_SENSOR_ORIENT_TILT_Z, 279 &st->incl[CHANNEL_SCAN_INDEX_Z]); 280 if (ret) 281 return ret; 282 incl_3d_adjust_channel_bit_mask(&channels[CHANNEL_SCAN_INDEX_Z], 283 st->incl[CHANNEL_SCAN_INDEX_Z].size); 284 285 dev_dbg(&pdev->dev, "incl_3d %x:%x, %x:%x, %x:%x\n", 286 st->incl[0].index, 287 st->incl[0].report_id, 288 st->incl[1].index, st->incl[1].report_id, 289 st->incl[2].index, st->incl[2].report_id); 290 291 st->scale_precision = hid_sensor_format_scale( 292 HID_USAGE_SENSOR_INCLINOMETER_3D, 293 &st->incl[CHANNEL_SCAN_INDEX_X], 294 &st->scale_pre_decml, &st->scale_post_decml); 295 296 /* Set Sensitivity field ids, when there is no individual modifier */ 297 if (st->common_attributes.sensitivity.index < 0) { 298 sensor_hub_input_get_attribute_info(hsdev, 299 HID_FEATURE_REPORT, usage_id, 300 HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS | 301 HID_USAGE_SENSOR_DATA_ORIENTATION, 302 &st->common_attributes.sensitivity); 303 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n", 304 st->common_attributes.sensitivity.index, 305 st->common_attributes.sensitivity.report_id); 306 } 307 return ret; 308 } 309 310 /* Function to initialize the processing for usage id */ 311 static int hid_incl_3d_probe(struct platform_device *pdev) 312 { 313 int ret; 314 static char *name = "incli_3d"; 315 struct iio_dev *indio_dev; 316 struct incl_3d_state *incl_state; 317 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 318 319 indio_dev = devm_iio_device_alloc(&pdev->dev, 320 sizeof(struct incl_3d_state)); 321 if (indio_dev == NULL) 322 return -ENOMEM; 323 324 platform_set_drvdata(pdev, indio_dev); 325 326 incl_state = iio_priv(indio_dev); 327 incl_state->common_attributes.hsdev = hsdev; 328 incl_state->common_attributes.pdev = pdev; 329 330 ret = hid_sensor_parse_common_attributes(hsdev, 331 HID_USAGE_SENSOR_INCLINOMETER_3D, 332 &incl_state->common_attributes); 333 if (ret) { 334 dev_err(&pdev->dev, "failed to setup common attributes\n"); 335 return ret; 336 } 337 338 indio_dev->channels = kmemdup(incl_3d_channels, 339 sizeof(incl_3d_channels), GFP_KERNEL); 340 if (!indio_dev->channels) { 341 dev_err(&pdev->dev, "failed to duplicate channels\n"); 342 return -ENOMEM; 343 } 344 345 ret = incl_3d_parse_report(pdev, hsdev, 346 (struct iio_chan_spec *)indio_dev->channels, 347 HID_USAGE_SENSOR_INCLINOMETER_3D, 348 incl_state); 349 if (ret) { 350 dev_err(&pdev->dev, "failed to setup attributes\n"); 351 goto error_free_dev_mem; 352 } 353 354 indio_dev->num_channels = ARRAY_SIZE(incl_3d_channels); 355 indio_dev->dev.parent = &pdev->dev; 356 indio_dev->info = &incl_3d_info; 357 indio_dev->name = name; 358 indio_dev->modes = INDIO_DIRECT_MODE; 359 360 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, 361 NULL, NULL); 362 if (ret) { 363 dev_err(&pdev->dev, "failed to initialize trigger buffer\n"); 364 goto error_free_dev_mem; 365 } 366 atomic_set(&incl_state->common_attributes.data_ready, 0); 367 ret = hid_sensor_setup_trigger(indio_dev, name, 368 &incl_state->common_attributes); 369 if (ret) { 370 dev_err(&pdev->dev, "trigger setup failed\n"); 371 goto error_unreg_buffer_funcs; 372 } 373 374 ret = iio_device_register(indio_dev); 375 if (ret) { 376 dev_err(&pdev->dev, "device register failed\n"); 377 goto error_remove_trigger; 378 } 379 380 incl_state->callbacks.send_event = incl_3d_proc_event; 381 incl_state->callbacks.capture_sample = incl_3d_capture_sample; 382 incl_state->callbacks.pdev = pdev; 383 ret = sensor_hub_register_callback(hsdev, 384 HID_USAGE_SENSOR_INCLINOMETER_3D, 385 &incl_state->callbacks); 386 if (ret) { 387 dev_err(&pdev->dev, "callback reg failed\n"); 388 goto error_iio_unreg; 389 } 390 391 return 0; 392 393 error_iio_unreg: 394 iio_device_unregister(indio_dev); 395 error_remove_trigger: 396 hid_sensor_remove_trigger(&incl_state->common_attributes); 397 error_unreg_buffer_funcs: 398 iio_triggered_buffer_cleanup(indio_dev); 399 error_free_dev_mem: 400 kfree(indio_dev->channels); 401 return ret; 402 } 403 404 /* Function to deinitialize the processing for usage id */ 405 static int hid_incl_3d_remove(struct platform_device *pdev) 406 { 407 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 408 struct iio_dev *indio_dev = platform_get_drvdata(pdev); 409 struct incl_3d_state *incl_state = iio_priv(indio_dev); 410 411 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_INCLINOMETER_3D); 412 iio_device_unregister(indio_dev); 413 hid_sensor_remove_trigger(&incl_state->common_attributes); 414 iio_triggered_buffer_cleanup(indio_dev); 415 kfree(indio_dev->channels); 416 417 return 0; 418 } 419 420 static const struct platform_device_id hid_incl_3d_ids[] = { 421 { 422 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ 423 .name = "HID-SENSOR-200086", 424 }, 425 { /* sentinel */ } 426 }; 427 MODULE_DEVICE_TABLE(platform, hid_incl_3d_ids); 428 429 static struct platform_driver hid_incl_3d_platform_driver = { 430 .id_table = hid_incl_3d_ids, 431 .driver = { 432 .name = KBUILD_MODNAME, 433 .pm = &hid_sensor_pm_ops, 434 }, 435 .probe = hid_incl_3d_probe, 436 .remove = hid_incl_3d_remove, 437 }; 438 module_platform_driver(hid_incl_3d_platform_driver); 439 440 MODULE_DESCRIPTION("HID Sensor Inclinometer 3D"); 441 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); 442 MODULE_LICENSE("GPL"); 443