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