drivers/iio/accel/hid-sensor-accel-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 accel_3d_channel {
  34         CHANNEL_SCAN_INDEX_X,
  35         CHANNEL_SCAN_INDEX_Y,
  36         CHANNEL_SCAN_INDEX_Z,
  37         ACCEL_3D_CHANNEL_MAX,
  38 };
  39
  40 struct accel_3d_state {
  41         struct hid_sensor_hub_callbacks callbacks;
  42         struct hid_sensor_common common_attributes;
  43         struct hid_sensor_hub_attribute_info accel[ACCEL_3D_CHANNEL_MAX];
  44         u32 accel_val[ACCEL_3D_CHANNEL_MAX];
  45 };
  46
  47 static const u32 accel_3d_addresses[ACCEL_3D_CHANNEL_MAX] = {
  48         HID_USAGE_SENSOR_ACCEL_X_AXIS,
  49         HID_USAGE_SENSOR_ACCEL_Y_AXIS,
  50         HID_USAGE_SENSOR_ACCEL_Z_AXIS
  51 };
  52
  53 /* Channel definitions */
  54 static const struct iio_chan_spec accel_3d_channels[] = {
  55         {
  56                 .type = IIO_ACCEL,
  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_ACCEL,
  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_ACCEL,
  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 accel_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 accel_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 accel_3d_state *accel_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 = accel_state->accel[chan->scan_index].report_id;
 113                 address = accel_3d_addresses[chan->scan_index];
 114                 if (report_id >= 0)
 115                         *val = sensor_hub_input_attr_get_raw_value(
 116                                 accel_state->common_attributes.hsdev,
 117                                 HID_USAGE_SENSOR_ACCEL_3D, address,
 118                                 report_id);
 119                 else {
 120                         *val = 0;
 121                         return -EINVAL;
 122                 }
 123                 ret_type = IIO_VAL_INT;
 124                 break;
 125         case IIO_CHAN_INFO_SCALE:
 126                 *val = accel_state->accel[CHANNEL_SCAN_INDEX_X].units;
 127                 ret_type = IIO_VAL_INT;
 128                 break;
 129         case IIO_CHAN_INFO_OFFSET:
 130                 *val = hid_sensor_convert_exponent(
 131                         accel_state->accel[CHANNEL_SCAN_INDEX_X].unit_expo);
 132                 ret_type = IIO_VAL_INT;
 133                 break;
 134         case IIO_CHAN_INFO_SAMP_FREQ:
 135                 ret = hid_sensor_read_samp_freq_value(
 136                         &accel_state->common_attributes, val, val2);
 137                 ret_type = IIO_VAL_INT_PLUS_MICRO;
 138                 break;
 139         case IIO_CHAN_INFO_HYSTERESIS:
 140                 ret = hid_sensor_read_raw_hyst_value(
 141                         &accel_state->common_attributes, val, val2);
 142                 ret_type = IIO_VAL_INT_PLUS_MICRO;
 143                 break;
 144         default:
 145                 ret_type = -EINVAL;
 146                 break;
 147         }
 148
 149         return ret_type;
 150 }
 151
 152 /* Channel write_raw handler */
 153 static int accel_3d_write_raw(struct iio_dev *indio_dev,
 154                                struct iio_chan_spec const *chan,
 155                                int val,
 156                                int val2,
 157                                long mask)
 158 {
 159         struct accel_3d_state *accel_state = iio_priv(indio_dev);
 160         int ret = 0;
 161
 162         switch (mask) {
 163         case IIO_CHAN_INFO_SAMP_FREQ:
 164                 ret = hid_sensor_write_samp_freq_value(
 165                                 &accel_state->common_attributes, val, val2);
 166                 break;
 167         case IIO_CHAN_INFO_HYSTERESIS:
 168                 ret = hid_sensor_write_raw_hyst_value(
 169                                 &accel_state->common_attributes, val, val2);
 170                 break;
 171         default:
 172                 ret = -EINVAL;
 173         }
 174
 175         return ret;
 176 }
 177
 178 static const struct iio_info accel_3d_info = {
 179         .driver_module = THIS_MODULE,
 180         .read_raw = &accel_3d_read_raw,
 181         .write_raw = &accel_3d_write_raw,
 182 };
 183
 184 /* Function to push data to buffer */
 185 static void hid_sensor_push_data(struct iio_dev *indio_dev, u8 *data, int len)
 186 {
 187         dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
 188         iio_push_to_buffers(indio_dev, (u8 *)data);
 189 }
 190
 191 /* Callback handler to send event after all samples are received and captured */
 192 static int accel_3d_proc_event(struct hid_sensor_hub_device *hsdev,
 193                                 unsigned usage_id,
 194                                 void *priv)
 195 {
 196         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 197         struct accel_3d_state *accel_state = iio_priv(indio_dev);
 198
 199         dev_dbg(&indio_dev->dev, "accel_3d_proc_event [%d]\n",
 200                                 accel_state->common_attributes.data_ready);
 201         if (accel_state->common_attributes.data_ready)
 202                 hid_sensor_push_data(indio_dev,
 203                                 (u8 *)accel_state->accel_val,
 204                                 sizeof(accel_state->accel_val));
 205
 206         return 0;
 207 }
 208
 209 /* Capture samples in local storage */
 210 static int accel_3d_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 accel_3d_state *accel_state = iio_priv(indio_dev);
 217         int offset;
 218         int ret = -EINVAL;
 219
 220         switch (usage_id) {
 221         case HID_USAGE_SENSOR_ACCEL_X_AXIS:
 222         case HID_USAGE_SENSOR_ACCEL_Y_AXIS:
 223         case HID_USAGE_SENSOR_ACCEL_Z_AXIS:
 224                 offset = usage_id - HID_USAGE_SENSOR_ACCEL_X_AXIS;
 225                 accel_state->accel_val[CHANNEL_SCAN_INDEX_X + offset] =
 226                                                 *(u32 *)raw_data;
 227                 ret = 0;
 228         break;
 229         default:
 230                 break;
 231         }
 232
 233         return ret;
 234 }
 235
 236 /* Parse report which is specific to an usage id*/
 237 static int accel_3d_parse_report(struct platform_device *pdev,
 238                                 struct hid_sensor_hub_device *hsdev,
 239                                 struct iio_chan_spec *channels,
 240                                 unsigned usage_id,
 241                                 struct accel_3d_state *st)
 242 {
 243         int ret;
 244         int i;
 245
 246         for (i = 0; i <= CHANNEL_SCAN_INDEX_Z; ++i) {
 247                 ret = sensor_hub_input_get_attribute_info(hsdev,
 248                                 HID_INPUT_REPORT,
 249                                 usage_id,
 250                                 HID_USAGE_SENSOR_ACCEL_X_AXIS + i,
 251                                 &st->accel[CHANNEL_SCAN_INDEX_X + i]);
 252                 if (ret < 0)
 253                         break;
 254                 accel_3d_adjust_channel_bit_mask(channels,
 255                                 CHANNEL_SCAN_INDEX_X + i,
 256                                 st->accel[CHANNEL_SCAN_INDEX_X + i].size);
 257         }
 258         dev_dbg(&pdev->dev, "accel_3d %x:%x, %x:%x, %x:%x\n",
 259                         st->accel[0].index,
 260                         st->accel[0].report_id,
 261                         st->accel[1].index, st->accel[1].report_id,
 262                         st->accel[2].index, st->accel[2].report_id);
 263
 264         return ret;
 265 }
 266
 267 /* Function to initialize the processing for usage id */
 268 static int hid_accel_3d_probe(struct platform_device *pdev)
 269 {
 270         int ret = 0;
 271         static const char *name = "accel_3d";
 272         struct iio_dev *indio_dev;
 273         struct accel_3d_state *accel_state;
 274         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 275         struct iio_chan_spec *channels;
 276
 277         indio_dev = devm_iio_device_alloc(&pdev->dev,
 278                                           sizeof(struct accel_3d_state));
 279         if (indio_dev == NULL)
 280                 return -ENOMEM;
 281
 282         platform_set_drvdata(pdev, indio_dev);
 283
 284         accel_state = iio_priv(indio_dev);
 285         accel_state->common_attributes.hsdev = hsdev;
 286         accel_state->common_attributes.pdev = pdev;
 287
 288         ret = hid_sensor_parse_common_attributes(hsdev,
 289                                         HID_USAGE_SENSOR_ACCEL_3D,
 290                                         &accel_state->common_attributes);
 291         if (ret) {
 292                 dev_err(&pdev->dev, "failed to setup common attributes\n");
 293                 return ret;
 294         }
 295
 296         channels = kmemdup(accel_3d_channels, sizeof(accel_3d_channels),
 297                            GFP_KERNEL);
 298         if (!channels) {
 299                 dev_err(&pdev->dev, "failed to duplicate channels\n");
 300                 return -ENOMEM;
 301         }
 302
 303         ret = accel_3d_parse_report(pdev, hsdev, channels,
 304                                         HID_USAGE_SENSOR_ACCEL_3D, accel_state);
 305         if (ret) {
 306                 dev_err(&pdev->dev, "failed to setup attributes\n");
 307                 goto error_free_dev_mem;
 308         }
 309
 310         indio_dev->channels = channels;
 311         indio_dev->num_channels = ARRAY_SIZE(accel_3d_channels);
 312         indio_dev->dev.parent = &pdev->dev;
 313         indio_dev->info = &accel_3d_info;
 314         indio_dev->name = name;
 315         indio_dev->modes = INDIO_DIRECT_MODE;
 316
 317         ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
 318                 NULL, NULL);
 319         if (ret) {
 320                 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
 321                 goto error_free_dev_mem;
 322         }
 323         accel_state->common_attributes.data_ready = false;
 324         ret = hid_sensor_setup_trigger(indio_dev, name,
 325                                         &accel_state->common_attributes);
 326         if (ret < 0) {
 327                 dev_err(&pdev->dev, "trigger setup failed\n");
 328                 goto error_unreg_buffer_funcs;
 329         }
 330
 331         ret = iio_device_register(indio_dev);
 332         if (ret) {
 333                 dev_err(&pdev->dev, "device register failed\n");
 334                 goto error_remove_trigger;
 335         }
 336
 337         accel_state->callbacks.send_event = accel_3d_proc_event;
 338         accel_state->callbacks.capture_sample = accel_3d_capture_sample;
 339         accel_state->callbacks.pdev = pdev;
 340         ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ACCEL_3D,
 341                                         &accel_state->callbacks);
 342         if (ret < 0) {
 343                 dev_err(&pdev->dev, "callback reg failed\n");
 344                 goto error_iio_unreg;
 345         }
 346
 347         return ret;
 348
 349 error_iio_unreg:
 350         iio_device_unregister(indio_dev);
 351 error_remove_trigger:
 352         hid_sensor_remove_trigger(indio_dev);
 353 error_unreg_buffer_funcs:
 354         iio_triggered_buffer_cleanup(indio_dev);
 355 error_free_dev_mem:
 356         kfree(indio_dev->channels);
 357         return ret;
 358 }
 359
 360 /* Function to deinitialize the processing for usage id */
 361 static int hid_accel_3d_remove(struct platform_device *pdev)
 362 {
 363         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 364         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 365
 366         sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ACCEL_3D);
 367         iio_device_unregister(indio_dev);
 368         hid_sensor_remove_trigger(indio_dev);
 369         iio_triggered_buffer_cleanup(indio_dev);
 370         kfree(indio_dev->channels);
 371
 372         return 0;
 373 }
 374
 375 static struct platform_device_id hid_accel_3d_ids[] = {
 376         {
 377                 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
 378                 .name = "HID-SENSOR-200073",
 379         },
 380         { /* sentinel */ }
 381 };
 382 MODULE_DEVICE_TABLE(platform, hid_accel_3d_ids);
 383
 384 static struct platform_driver hid_accel_3d_platform_driver = {
 385         .id_table = hid_accel_3d_ids,
 386         .driver = {
 387                 .name   = KBUILD_MODNAME,
 388                 .owner  = THIS_MODULE,
 389         },
 390         .probe          = hid_accel_3d_probe,
 391         .remove         = hid_accel_3d_remove,
 392 };
 393 module_platform_driver(hid_accel_3d_platform_driver);
 394
 395 MODULE_DESCRIPTION("HID Sensor Accel 3D");
 396 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 397 MODULE_LICENSE("GPL");