Version:  2.0.40 2.2.26 2.4.37 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0

Linux/drivers/iio/orientation/hid-sensor-incl-3d.c

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

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us