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 s32 poll_value; 115 116 *val = 0; 117 *val2 = 0; 118 switch (mask) { 119 case IIO_CHAN_INFO_RAW: 120 poll_value = hid_sensor_read_poll_value( 121 &incl_state->common_attributes); 122 if (poll_value < 0) 123 return -EINVAL; 124 125 hid_sensor_power_state(&incl_state->common_attributes, true); 126 msleep_interruptible(poll_value * 2); 127 128 report_id = 129 incl_state->incl[chan->scan_index].report_id; 130 address = incl_3d_addresses[chan->scan_index]; 131 if (report_id >= 0) 132 *val = sensor_hub_input_attr_get_raw_value( 133 incl_state->common_attributes.hsdev, 134 HID_USAGE_SENSOR_INCLINOMETER_3D, address, 135 report_id); 136 else { 137 hid_sensor_power_state(&incl_state->common_attributes, 138 false); 139 return -EINVAL; 140 } 141 hid_sensor_power_state(&incl_state->common_attributes, false); 142 ret_type = IIO_VAL_INT; 143 break; 144 case IIO_CHAN_INFO_SCALE: 145 *val = incl_state->scale_pre_decml; 146 *val2 = incl_state->scale_post_decml; 147 ret_type = incl_state->scale_precision; 148 break; 149 case IIO_CHAN_INFO_OFFSET: 150 *val = incl_state->value_offset; 151 ret_type = IIO_VAL_INT; 152 break; 153 case IIO_CHAN_INFO_SAMP_FREQ: 154 ret_type = hid_sensor_read_samp_freq_value( 155 &incl_state->common_attributes, val, val2); 156 break; 157 case IIO_CHAN_INFO_HYSTERESIS: 158 ret_type = hid_sensor_read_raw_hyst_value( 159 &incl_state->common_attributes, val, val2); 160 break; 161 default: 162 ret_type = -EINVAL; 163 break; 164 } 165 166 return ret_type; 167 } 168 169 /* Channel write_raw handler */ 170 static int incl_3d_write_raw(struct iio_dev *indio_dev, 171 struct iio_chan_spec const *chan, 172 int val, 173 int val2, 174 long mask) 175 { 176 struct incl_3d_state *incl_state = iio_priv(indio_dev); 177 int ret; 178 179 switch (mask) { 180 case IIO_CHAN_INFO_SAMP_FREQ: 181 ret = hid_sensor_write_samp_freq_value( 182 &incl_state->common_attributes, val, val2); 183 break; 184 case IIO_CHAN_INFO_HYSTERESIS: 185 ret = hid_sensor_write_raw_hyst_value( 186 &incl_state->common_attributes, val, val2); 187 break; 188 default: 189 ret = -EINVAL; 190 } 191 192 return ret; 193 } 194 195 static const struct iio_info incl_3d_info = { 196 .driver_module = THIS_MODULE, 197 .read_raw = &incl_3d_read_raw, 198 .write_raw = &incl_3d_write_raw, 199 }; 200 201 /* Function to push data to buffer */ 202 static void hid_sensor_push_data(struct iio_dev *indio_dev, u8 *data, int len) 203 { 204 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); 205 iio_push_to_buffers(indio_dev, (u8 *)data); 206 } 207 208 /* Callback handler to send event after all samples are received and captured */ 209 static int incl_3d_proc_event(struct hid_sensor_hub_device *hsdev, 210 unsigned usage_id, 211 void *priv) 212 { 213 struct iio_dev *indio_dev = platform_get_drvdata(priv); 214 struct incl_3d_state *incl_state = iio_priv(indio_dev); 215 216 dev_dbg(&indio_dev->dev, "incl_3d_proc_event\n"); 217 if (atomic_read(&incl_state->common_attributes.data_ready)) 218 hid_sensor_push_data(indio_dev, 219 (u8 *)incl_state->incl_val, 220 sizeof(incl_state->incl_val)); 221 222 return 0; 223 } 224 225 /* Capture samples in local storage */ 226 static int incl_3d_capture_sample(struct hid_sensor_hub_device *hsdev, 227 unsigned usage_id, 228 size_t raw_len, char *raw_data, 229 void *priv) 230 { 231 struct iio_dev *indio_dev = platform_get_drvdata(priv); 232 struct incl_3d_state *incl_state = iio_priv(indio_dev); 233 int ret = 0; 234 235 switch (usage_id) { 236 case HID_USAGE_SENSOR_ORIENT_TILT_X: 237 incl_state->incl_val[CHANNEL_SCAN_INDEX_X] = *(u32 *)raw_data; 238 break; 239 case HID_USAGE_SENSOR_ORIENT_TILT_Y: 240 incl_state->incl_val[CHANNEL_SCAN_INDEX_Y] = *(u32 *)raw_data; 241 break; 242 case HID_USAGE_SENSOR_ORIENT_TILT_Z: 243 incl_state->incl_val[CHANNEL_SCAN_INDEX_Z] = *(u32 *)raw_data; 244 break; 245 default: 246 ret = -EINVAL; 247 break; 248 } 249 250 return ret; 251 } 252 253 /* Parse report which is specific to an usage id*/ 254 static int incl_3d_parse_report(struct platform_device *pdev, 255 struct hid_sensor_hub_device *hsdev, 256 struct iio_chan_spec *channels, 257 unsigned usage_id, 258 struct incl_3d_state *st) 259 { 260 int ret; 261 262 ret = sensor_hub_input_get_attribute_info(hsdev, 263 HID_INPUT_REPORT, 264 usage_id, 265 HID_USAGE_SENSOR_ORIENT_TILT_X, 266 &st->incl[CHANNEL_SCAN_INDEX_X]); 267 if (ret) 268 return ret; 269 incl_3d_adjust_channel_bit_mask(&channels[CHANNEL_SCAN_INDEX_X], 270 st->incl[CHANNEL_SCAN_INDEX_X].size); 271 272 ret = sensor_hub_input_get_attribute_info(hsdev, 273 HID_INPUT_REPORT, 274 usage_id, 275 HID_USAGE_SENSOR_ORIENT_TILT_Y, 276 &st->incl[CHANNEL_SCAN_INDEX_Y]); 277 if (ret) 278 return ret; 279 incl_3d_adjust_channel_bit_mask(&channels[CHANNEL_SCAN_INDEX_Y], 280 st->incl[CHANNEL_SCAN_INDEX_Y].size); 281 282 ret = sensor_hub_input_get_attribute_info(hsdev, 283 HID_INPUT_REPORT, 284 usage_id, 285 HID_USAGE_SENSOR_ORIENT_TILT_Z, 286 &st->incl[CHANNEL_SCAN_INDEX_Z]); 287 if (ret) 288 return ret; 289 incl_3d_adjust_channel_bit_mask(&channels[CHANNEL_SCAN_INDEX_Z], 290 st->incl[CHANNEL_SCAN_INDEX_Z].size); 291 292 dev_dbg(&pdev->dev, "incl_3d %x:%x, %x:%x, %x:%x\n", 293 st->incl[0].index, 294 st->incl[0].report_id, 295 st->incl[1].index, st->incl[1].report_id, 296 st->incl[2].index, st->incl[2].report_id); 297 298 st->scale_precision = hid_sensor_format_scale( 299 HID_USAGE_SENSOR_INCLINOMETER_3D, 300 &st->incl[CHANNEL_SCAN_INDEX_X], 301 &st->scale_pre_decml, &st->scale_post_decml); 302 303 /* Set Sensitivity field ids, when there is no individual modifier */ 304 if (st->common_attributes.sensitivity.index < 0) { 305 sensor_hub_input_get_attribute_info(hsdev, 306 HID_FEATURE_REPORT, usage_id, 307 HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS | 308 HID_USAGE_SENSOR_DATA_ORIENTATION, 309 &st->common_attributes.sensitivity); 310 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n", 311 st->common_attributes.sensitivity.index, 312 st->common_attributes.sensitivity.report_id); 313 } 314 return ret; 315 } 316 317 /* Function to initialize the processing for usage id */ 318 static int hid_incl_3d_probe(struct platform_device *pdev) 319 { 320 int ret; 321 static char *name = "incli_3d"; 322 struct iio_dev *indio_dev; 323 struct incl_3d_state *incl_state; 324 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 325 struct iio_chan_spec *channels; 326 327 indio_dev = devm_iio_device_alloc(&pdev->dev, 328 sizeof(struct incl_3d_state)); 329 if (indio_dev == NULL) 330 return -ENOMEM; 331 332 platform_set_drvdata(pdev, indio_dev); 333 334 incl_state = iio_priv(indio_dev); 335 incl_state->common_attributes.hsdev = hsdev; 336 incl_state->common_attributes.pdev = pdev; 337 338 ret = hid_sensor_parse_common_attributes(hsdev, 339 HID_USAGE_SENSOR_INCLINOMETER_3D, 340 &incl_state->common_attributes); 341 if (ret) { 342 dev_err(&pdev->dev, "failed to setup common attributes\n"); 343 return ret; 344 } 345 346 channels = kmemdup(incl_3d_channels, sizeof(incl_3d_channels), 347 GFP_KERNEL); 348 if (!channels) { 349 dev_err(&pdev->dev, "failed to duplicate channels\n"); 350 return -ENOMEM; 351 } 352 353 ret = incl_3d_parse_report(pdev, hsdev, channels, 354 HID_USAGE_SENSOR_INCLINOMETER_3D, incl_state); 355 if (ret) { 356 dev_err(&pdev->dev, "failed to setup attributes\n"); 357 goto error_free_dev_mem; 358 } 359 360 indio_dev->channels = channels; 361 indio_dev->num_channels = ARRAY_SIZE(incl_3d_channels); 362 indio_dev->dev.parent = &pdev->dev; 363 indio_dev->info = &incl_3d_info; 364 indio_dev->name = name; 365 indio_dev->modes = INDIO_DIRECT_MODE; 366 367 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, 368 NULL, NULL); 369 if (ret) { 370 dev_err(&pdev->dev, "failed to initialize trigger buffer\n"); 371 goto error_free_dev_mem; 372 } 373 atomic_set(&incl_state->common_attributes.data_ready, 0); 374 ret = hid_sensor_setup_trigger(indio_dev, name, 375 &incl_state->common_attributes); 376 if (ret) { 377 dev_err(&pdev->dev, "trigger setup failed\n"); 378 goto error_unreg_buffer_funcs; 379 } 380 381 ret = iio_device_register(indio_dev); 382 if (ret) { 383 dev_err(&pdev->dev, "device register failed\n"); 384 goto error_remove_trigger; 385 } 386 387 incl_state->callbacks.send_event = incl_3d_proc_event; 388 incl_state->callbacks.capture_sample = incl_3d_capture_sample; 389 incl_state->callbacks.pdev = pdev; 390 ret = sensor_hub_register_callback(hsdev, 391 HID_USAGE_SENSOR_INCLINOMETER_3D, 392 &incl_state->callbacks); 393 if (ret) { 394 dev_err(&pdev->dev, "callback reg failed\n"); 395 goto error_iio_unreg; 396 } 397 398 return 0; 399 400 error_iio_unreg: 401 iio_device_unregister(indio_dev); 402 error_remove_trigger: 403 hid_sensor_remove_trigger(&incl_state->common_attributes); 404 error_unreg_buffer_funcs: 405 iio_triggered_buffer_cleanup(indio_dev); 406 error_free_dev_mem: 407 kfree(indio_dev->channels); 408 return ret; 409 } 410 411 /* Function to deinitialize the processing for usage id */ 412 static int hid_incl_3d_remove(struct platform_device *pdev) 413 { 414 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 415 struct iio_dev *indio_dev = platform_get_drvdata(pdev); 416 struct incl_3d_state *incl_state = iio_priv(indio_dev); 417 418 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_INCLINOMETER_3D); 419 iio_device_unregister(indio_dev); 420 hid_sensor_remove_trigger(&incl_state->common_attributes); 421 iio_triggered_buffer_cleanup(indio_dev); 422 kfree(indio_dev->channels); 423 424 return 0; 425 } 426 427 static struct platform_device_id hid_incl_3d_ids[] = { 428 { 429 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ 430 .name = "HID-SENSOR-200086", 431 }, 432 { /* sentinel */ } 433 }; 434 MODULE_DEVICE_TABLE(platform, hid_incl_3d_ids); 435 436 static struct platform_driver hid_incl_3d_platform_driver = { 437 .id_table = hid_incl_3d_ids, 438 .driver = { 439 .name = KBUILD_MODNAME, 440 }, 441 .probe = hid_incl_3d_probe, 442 .remove = hid_incl_3d_remove, 443 }; 444 module_platform_driver(hid_incl_3d_platform_driver); 445 446 MODULE_DESCRIPTION("HID Sensor Inclinometer 3D"); 447 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); 448 MODULE_LICENSE("GPL"); 449