drivers/iio/magnetometer/hid-sensor-magn-3d.c

   1 /*
   2  * HID Sensors Driver
   3  * Copyright (c) 2012, 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  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  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/hid-sensor-hub.h>
  26 #include <linux/iio/iio.h>
  27 #include <linux/iio/sysfs.h>
  28 #include <linux/iio/buffer.h>
  29 #include <linux/iio/trigger_consumer.h>
  30 #include <linux/iio/triggered_buffer.h>
  31 #include "../common/hid-sensors/hid-sensor-trigger.h"
  32
  33 enum magn_3d_channel {
  34         CHANNEL_SCAN_INDEX_X,
  35         CHANNEL_SCAN_INDEX_Y,
  36         CHANNEL_SCAN_INDEX_Z,
  37         MAGN_3D_CHANNEL_MAX,
  38 };
  39
  40 struct magn_3d_state {
  41         struct hid_sensor_hub_callbacks callbacks;
  42         struct hid_sensor_common common_attributes;
  43         struct hid_sensor_hub_attribute_info magn[MAGN_3D_CHANNEL_MAX];
  44         u32 magn_val[MAGN_3D_CHANNEL_MAX];
  45 };
  46
  47 static const u32 magn_3d_addresses[MAGN_3D_CHANNEL_MAX] = {
  48         HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS,
  49         HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Y_AXIS,
  50         HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Z_AXIS
  51 };
  52
  53 /* Channel definitions */
  54 static const struct iio_chan_spec magn_3d_channels[] = {
  55         {
  56                 .type = IIO_MAGN,
  57                 .modified = 1,
  58                 .channel2 = IIO_MOD_X,
  59                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  60                 BIT(IIO_CHAN_INFO_SCALE) |
  61                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  62                 BIT(IIO_CHAN_INFO_HYSTERESIS),
  63                 .scan_index = CHANNEL_SCAN_INDEX_X,
  64         }, {
  65                 .type = IIO_MAGN,
  66                 .modified = 1,
  67                 .channel2 = IIO_MOD_Y,
  68                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  69                 BIT(IIO_CHAN_INFO_SCALE) |
  70                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  71                 BIT(IIO_CHAN_INFO_HYSTERESIS),
  72                 .scan_index = CHANNEL_SCAN_INDEX_Y,
  73         }, {
  74                 .type = IIO_MAGN,
  75                 .modified = 1,
  76                 .channel2 = IIO_MOD_Z,
  77                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  78                 BIT(IIO_CHAN_INFO_SCALE) |
  79                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  80                 BIT(IIO_CHAN_INFO_HYSTERESIS),
  81                 .scan_index = CHANNEL_SCAN_INDEX_Z,
  82         }
  83 };
  84
  85 /* Adjust channel real bits based on report descriptor */
  86 static void magn_3d_adjust_channel_bit_mask(struct iio_chan_spec *channels,
  87                                                 int channel, int size)
  88 {
  89         channels[channel].scan_type.sign = 's';
  90         /* Real storage bits will change based on the report desc. */
  91         channels[channel].scan_type.realbits = size * 8;
  92         /* Maximum size of a sample to capture is u32 */
  93         channels[channel].scan_type.storagebits = sizeof(u32) * 8;
  94 }
  95
  96 /* Channel read_raw handler */
  97 static int magn_3d_read_raw(struct iio_dev *indio_dev,
  98                               struct iio_chan_spec const *chan,
  99                               int *val, int *val2,
 100                               long mask)
 101 {
 102         struct magn_3d_state *magn_state = iio_priv(indio_dev);
 103         int report_id = -1;
 104         u32 address;
 105         int ret;
 106         int ret_type;
 107
 108         *val = 0;
 109         *val2 = 0;
 110         switch (mask) {
 111         case 0:
 112                 report_id =
 113                         magn_state->magn[chan->scan_index].report_id;
 114                 address = magn_3d_addresses[chan->scan_index];
 115                 if (report_id >= 0)
 116                         *val = sensor_hub_input_attr_get_raw_value(
 117                                 magn_state->common_attributes.hsdev,
 118                                 HID_USAGE_SENSOR_COMPASS_3D, address,
 119                                 report_id);
 120                 else {
 121                         *val = 0;
 122                         return -EINVAL;
 123                 }
 124                 ret_type = IIO_VAL_INT;
 125                 break;
 126         case IIO_CHAN_INFO_SCALE:
 127                 *val = magn_state->magn[CHANNEL_SCAN_INDEX_X].units;
 128                 ret_type = IIO_VAL_INT;
 129                 break;
 130         case IIO_CHAN_INFO_OFFSET:
 131                 *val = hid_sensor_convert_exponent(
 132                         magn_state->magn[CHANNEL_SCAN_INDEX_X].unit_expo);
 133                 ret_type = IIO_VAL_INT;
 134                 break;
 135         case IIO_CHAN_INFO_SAMP_FREQ:
 136                 ret = hid_sensor_read_samp_freq_value(
 137                         &magn_state->common_attributes, val, val2);
 138                 ret_type = IIO_VAL_INT_PLUS_MICRO;
 139                 break;
 140         case IIO_CHAN_INFO_HYSTERESIS:
 141                 ret = hid_sensor_read_raw_hyst_value(
 142                         &magn_state->common_attributes, val, val2);
 143                 ret_type = IIO_VAL_INT_PLUS_MICRO;
 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 magn_3d_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 magn_3d_state *magn_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                                 &magn_state->common_attributes, val, val2);
 167                 break;
 168         case IIO_CHAN_INFO_HYSTERESIS:
 169                 ret = hid_sensor_write_raw_hyst_value(
 170                                 &magn_state->common_attributes, val, val2);
 171                 break;
 172         default:
 173                 ret = -EINVAL;
 174         }
 175
 176         return ret;
 177 }
 178
 179 static const struct iio_info magn_3d_info = {
 180         .driver_module = THIS_MODULE,
 181         .read_raw = &magn_3d_read_raw,
 182         .write_raw = &magn_3d_write_raw,
 183 };
 184
 185 /* Function to push data to buffer */
 186 static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
 187         int len)
 188 {
 189         dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
 190         iio_push_to_buffers(indio_dev, data);
 191 }
 192
 193 /* Callback handler to send event after all samples are received and captured */
 194 static int magn_3d_proc_event(struct hid_sensor_hub_device *hsdev,
 195                                 unsigned usage_id,
 196                                 void *priv)
 197 {
 198         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 199         struct magn_3d_state *magn_state = iio_priv(indio_dev);
 200
 201         dev_dbg(&indio_dev->dev, "magn_3d_proc_event [%d]\n",
 202                                 magn_state->common_attributes.data_ready);
 203         if (magn_state->common_attributes.data_ready)
 204                 hid_sensor_push_data(indio_dev,
 205                                 magn_state->magn_val,
 206                                 sizeof(magn_state->magn_val));
 207
 208         return 0;
 209 }
 210
 211 /* Capture samples in local storage */
 212 static int magn_3d_capture_sample(struct hid_sensor_hub_device *hsdev,
 213                                 unsigned usage_id,
 214                                 size_t raw_len, char *raw_data,
 215                                 void *priv)
 216 {
 217         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 218         struct magn_3d_state *magn_state = iio_priv(indio_dev);
 219         int offset;
 220         int ret = -EINVAL;
 221
 222         switch (usage_id) {
 223         case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS:
 224         case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Y_AXIS:
 225         case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Z_AXIS:
 226                 offset = usage_id - HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS;
 227                 magn_state->magn_val[CHANNEL_SCAN_INDEX_X + offset] =
 228                                                 *(u32 *)raw_data;
 229                 ret = 0;
 230         break;
 231         default:
 232                 break;
 233         }
 234
 235         return ret;
 236 }
 237
 238 /* Parse report which is specific to an usage id*/
 239 static int magn_3d_parse_report(struct platform_device *pdev,
 240                                 struct hid_sensor_hub_device *hsdev,
 241                                 struct iio_chan_spec *channels,
 242                                 unsigned usage_id,
 243                                 struct magn_3d_state *st)
 244 {
 245         int ret;
 246         int i;
 247
 248         for (i = 0; i <= CHANNEL_SCAN_INDEX_Z; ++i) {
 249                 ret = sensor_hub_input_get_attribute_info(hsdev,
 250                                 HID_INPUT_REPORT,
 251                                 usage_id,
 252                                 HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS + i,
 253                                 &st->magn[CHANNEL_SCAN_INDEX_X + i]);
 254                 if (ret < 0)
 255                         break;
 256                 magn_3d_adjust_channel_bit_mask(channels,
 257                                 CHANNEL_SCAN_INDEX_X + i,
 258                                 st->magn[CHANNEL_SCAN_INDEX_X + i].size);
 259         }
 260         dev_dbg(&pdev->dev, "magn_3d %x:%x, %x:%x, %x:%x\n",
 261                         st->magn[0].index,
 262                         st->magn[0].report_id,
 263                         st->magn[1].index, st->magn[1].report_id,
 264                         st->magn[2].index, st->magn[2].report_id);
 265
 266         return ret;
 267 }
 268
 269 /* Function to initialize the processing for usage id */
 270 static int hid_magn_3d_probe(struct platform_device *pdev)
 271 {
 272         int ret = 0;
 273         static char *name = "magn_3d";
 274         struct iio_dev *indio_dev;
 275         struct magn_3d_state *magn_state;
 276         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 277         struct iio_chan_spec *channels;
 278
 279         indio_dev = devm_iio_device_alloc(&pdev->dev,
 280                                           sizeof(struct magn_3d_state));
 281         if (indio_dev == NULL)
 282                 return -ENOMEM;
 283
 284         platform_set_drvdata(pdev, indio_dev);
 285
 286         magn_state = iio_priv(indio_dev);
 287         magn_state->common_attributes.hsdev = hsdev;
 288         magn_state->common_attributes.pdev = pdev;
 289
 290         ret = hid_sensor_parse_common_attributes(hsdev,
 291                                 HID_USAGE_SENSOR_COMPASS_3D,
 292                                 &magn_state->common_attributes);
 293         if (ret) {
 294                 dev_err(&pdev->dev, "failed to setup common attributes\n");
 295                 return ret;
 296         }
 297
 298         channels = kmemdup(magn_3d_channels, sizeof(magn_3d_channels),
 299                            GFP_KERNEL);
 300         if (!channels) {
 301                 dev_err(&pdev->dev, "failed to duplicate channels\n");
 302                 return -ENOMEM;
 303         }
 304
 305         ret = magn_3d_parse_report(pdev, hsdev, channels,
 306                                 HID_USAGE_SENSOR_COMPASS_3D, magn_state);
 307         if (ret) {
 308                 dev_err(&pdev->dev, "failed to setup attributes\n");
 309                 goto error_free_dev_mem;
 310         }
 311
 312         indio_dev->channels = channels;
 313         indio_dev->num_channels = ARRAY_SIZE(magn_3d_channels);
 314         indio_dev->dev.parent = &pdev->dev;
 315         indio_dev->info = &magn_3d_info;
 316         indio_dev->name = name;
 317         indio_dev->modes = INDIO_DIRECT_MODE;
 318
 319         ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
 320                 NULL, NULL);
 321         if (ret) {
 322                 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
 323                 goto error_free_dev_mem;
 324         }
 325         magn_state->common_attributes.data_ready = false;
 326         ret = hid_sensor_setup_trigger(indio_dev, name,
 327                                         &magn_state->common_attributes);
 328         if (ret < 0) {
 329                 dev_err(&pdev->dev, "trigger setup failed\n");
 330                 goto error_unreg_buffer_funcs;
 331         }
 332
 333         ret = iio_device_register(indio_dev);
 334         if (ret) {
 335                 dev_err(&pdev->dev, "device register failed\n");
 336                 goto error_remove_trigger;
 337         }
 338
 339         magn_state->callbacks.send_event = magn_3d_proc_event;
 340         magn_state->callbacks.capture_sample = magn_3d_capture_sample;
 341         magn_state->callbacks.pdev = pdev;
 342         ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_COMPASS_3D,
 343                                         &magn_state->callbacks);
 344         if (ret < 0) {
 345                 dev_err(&pdev->dev, "callback reg failed\n");
 346                 goto error_iio_unreg;
 347         }
 348
 349         return ret;
 350
 351 error_iio_unreg:
 352         iio_device_unregister(indio_dev);
 353 error_remove_trigger:
 354         hid_sensor_remove_trigger(&magn_state->common_attributes);
 355 error_unreg_buffer_funcs:
 356         iio_triggered_buffer_cleanup(indio_dev);
 357 error_free_dev_mem:
 358         kfree(indio_dev->channels);
 359         return ret;
 360 }
 361
 362 /* Function to deinitialize the processing for usage id */
 363 static int hid_magn_3d_remove(struct platform_device *pdev)
 364 {
 365         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 366         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 367         struct magn_3d_state *magn_state = iio_priv(indio_dev);
 368
 369         sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_COMPASS_3D);
 370         iio_device_unregister(indio_dev);
 371         hid_sensor_remove_trigger(&magn_state->common_attributes);
 372         iio_triggered_buffer_cleanup(indio_dev);
 373         kfree(indio_dev->channels);
 374
 375         return 0;
 376 }
 377
 378 static struct platform_device_id hid_magn_3d_ids[] = {
 379         {
 380                 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
 381                 .name = "HID-SENSOR-200083",
 382         },
 383         { /* sentinel */ }
 384 };
 385 MODULE_DEVICE_TABLE(platform, hid_magn_3d_ids);
 386
 387 static struct platform_driver hid_magn_3d_platform_driver = {
 388         .id_table = hid_magn_3d_ids,
 389         .driver = {
 390                 .name   = KBUILD_MODNAME,
 391                 .owner  = THIS_MODULE,
 392         },
 393         .probe          = hid_magn_3d_probe,
 394         .remove         = hid_magn_3d_remove,
 395 };
 396 module_platform_driver(hid_magn_3d_platform_driver);
 397
 398 MODULE_DESCRIPTION("HID Sensor Magnetometer 3D");
 399 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 400 MODULE_LICENSE("GPL");