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Linux/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/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 accel_3d_channel {
 35         CHANNEL_SCAN_INDEX_X,
 36         CHANNEL_SCAN_INDEX_Y,
 37         CHANNEL_SCAN_INDEX_Z,
 38         ACCEL_3D_CHANNEL_MAX,
 39 };
 40 
 41 struct accel_3d_state {
 42         struct hid_sensor_hub_callbacks callbacks;
 43         struct hid_sensor_common common_attributes;
 44         struct hid_sensor_hub_attribute_info accel[ACCEL_3D_CHANNEL_MAX];
 45         u32 accel_val[ACCEL_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 accel_3d_addresses[ACCEL_3D_CHANNEL_MAX] = {
 53         HID_USAGE_SENSOR_ACCEL_X_AXIS,
 54         HID_USAGE_SENSOR_ACCEL_Y_AXIS,
 55         HID_USAGE_SENSOR_ACCEL_Z_AXIS
 56 };
 57 
 58 /* Channel definitions */
 59 static const struct iio_chan_spec accel_3d_channels[] = {
 60         {
 61                 .type = IIO_ACCEL,
 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_ACCEL,
 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_ACCEL,
 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 accel_3d_adjust_channel_bit_mask(struct iio_chan_spec *channels,
 95                                                 int channel, int size)
 96 {
 97         channels[channel].scan_type.sign = 's';
 98         /* Real storage bits will change based on the report desc. */
 99         channels[channel].scan_type.realbits = size * 8;
100         /* Maximum size of a sample to capture is u32 */
101         channels[channel].scan_type.storagebits = sizeof(u32) * 8;
102 }
103 
104 /* Channel read_raw handler */
105 static int accel_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 accel_3d_state *accel_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 0:
120                 poll_value = hid_sensor_read_poll_value(
121                                         &accel_state->common_attributes);
122                 if (poll_value < 0)
123                         return -EINVAL;
124 
125                 hid_sensor_power_state(&accel_state->common_attributes, true);
126                 msleep_interruptible(poll_value * 2);
127                 report_id = accel_state->accel[chan->scan_index].report_id;
128                 address = accel_3d_addresses[chan->scan_index];
129                 if (report_id >= 0)
130                         *val = sensor_hub_input_attr_get_raw_value(
131                                         accel_state->common_attributes.hsdev,
132                                         HID_USAGE_SENSOR_ACCEL_3D, address,
133                                         report_id);
134                 else {
135                         *val = 0;
136                         hid_sensor_power_state(&accel_state->common_attributes,
137                                                  false);
138                         return -EINVAL;
139                 }
140                 hid_sensor_power_state(&accel_state->common_attributes, false);
141                 ret_type = IIO_VAL_INT;
142                 break;
143         case IIO_CHAN_INFO_SCALE:
144                 *val = accel_state->scale_pre_decml;
145                 *val2 = accel_state->scale_post_decml;
146                 ret_type = accel_state->scale_precision;
147                 break;
148         case IIO_CHAN_INFO_OFFSET:
149                 *val = accel_state->value_offset;
150                 ret_type = IIO_VAL_INT;
151                 break;
152         case IIO_CHAN_INFO_SAMP_FREQ:
153                 ret_type = hid_sensor_read_samp_freq_value(
154                         &accel_state->common_attributes, val, val2);
155                 break;
156         case IIO_CHAN_INFO_HYSTERESIS:
157                 ret_type = hid_sensor_read_raw_hyst_value(
158                         &accel_state->common_attributes, val, val2);
159                 break;
160         default:
161                 ret_type = -EINVAL;
162                 break;
163         }
164 
165         return ret_type;
166 }
167 
168 /* Channel write_raw handler */
169 static int accel_3d_write_raw(struct iio_dev *indio_dev,
170                                struct iio_chan_spec const *chan,
171                                int val,
172                                int val2,
173                                long mask)
174 {
175         struct accel_3d_state *accel_state = iio_priv(indio_dev);
176         int ret = 0;
177 
178         switch (mask) {
179         case IIO_CHAN_INFO_SAMP_FREQ:
180                 ret = hid_sensor_write_samp_freq_value(
181                                 &accel_state->common_attributes, val, val2);
182                 break;
183         case IIO_CHAN_INFO_HYSTERESIS:
184                 ret = hid_sensor_write_raw_hyst_value(
185                                 &accel_state->common_attributes, val, val2);
186                 break;
187         default:
188                 ret = -EINVAL;
189         }
190 
191         return ret;
192 }
193 
194 static const struct iio_info accel_3d_info = {
195         .driver_module = THIS_MODULE,
196         .read_raw = &accel_3d_read_raw,
197         .write_raw = &accel_3d_write_raw,
198 };
199 
200 /* Function to push data to buffer */
201 static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
202         int len)
203 {
204         dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
205         iio_push_to_buffers(indio_dev, data);
206 }
207 
208 /* Callback handler to send event after all samples are received and captured */
209 static int accel_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 accel_3d_state *accel_state = iio_priv(indio_dev);
215 
216         dev_dbg(&indio_dev->dev, "accel_3d_proc_event\n");
217         if (atomic_read(&accel_state->common_attributes.data_ready))
218                 hid_sensor_push_data(indio_dev,
219                                 accel_state->accel_val,
220                                 sizeof(accel_state->accel_val));
221 
222         return 0;
223 }
224 
225 /* Capture samples in local storage */
226 static int accel_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 accel_3d_state *accel_state = iio_priv(indio_dev);
233         int offset;
234         int ret = -EINVAL;
235 
236         switch (usage_id) {
237         case HID_USAGE_SENSOR_ACCEL_X_AXIS:
238         case HID_USAGE_SENSOR_ACCEL_Y_AXIS:
239         case HID_USAGE_SENSOR_ACCEL_Z_AXIS:
240                 offset = usage_id - HID_USAGE_SENSOR_ACCEL_X_AXIS;
241                 accel_state->accel_val[CHANNEL_SCAN_INDEX_X + offset] =
242                                                 *(u32 *)raw_data;
243                 ret = 0;
244         break;
245         default:
246                 break;
247         }
248 
249         return ret;
250 }
251 
252 /* Parse report which is specific to an usage id*/
253 static int accel_3d_parse_report(struct platform_device *pdev,
254                                 struct hid_sensor_hub_device *hsdev,
255                                 struct iio_chan_spec *channels,
256                                 unsigned usage_id,
257                                 struct accel_3d_state *st)
258 {
259         int ret;
260         int i;
261 
262         for (i = 0; i <= CHANNEL_SCAN_INDEX_Z; ++i) {
263                 ret = sensor_hub_input_get_attribute_info(hsdev,
264                                 HID_INPUT_REPORT,
265                                 usage_id,
266                                 HID_USAGE_SENSOR_ACCEL_X_AXIS + i,
267                                 &st->accel[CHANNEL_SCAN_INDEX_X + i]);
268                 if (ret < 0)
269                         break;
270                 accel_3d_adjust_channel_bit_mask(channels,
271                                 CHANNEL_SCAN_INDEX_X + i,
272                                 st->accel[CHANNEL_SCAN_INDEX_X + i].size);
273         }
274         dev_dbg(&pdev->dev, "accel_3d %x:%x, %x:%x, %x:%x\n",
275                         st->accel[0].index,
276                         st->accel[0].report_id,
277                         st->accel[1].index, st->accel[1].report_id,
278                         st->accel[2].index, st->accel[2].report_id);
279 
280         st->scale_precision = hid_sensor_format_scale(
281                                 HID_USAGE_SENSOR_ACCEL_3D,
282                                 &st->accel[CHANNEL_SCAN_INDEX_X],
283                                 &st->scale_pre_decml, &st->scale_post_decml);
284 
285         /* Set Sensitivity field ids, when there is no individual modifier */
286         if (st->common_attributes.sensitivity.index < 0) {
287                 sensor_hub_input_get_attribute_info(hsdev,
288                         HID_FEATURE_REPORT, usage_id,
289                         HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
290                         HID_USAGE_SENSOR_DATA_ACCELERATION,
291                         &st->common_attributes.sensitivity);
292                 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
293                         st->common_attributes.sensitivity.index,
294                         st->common_attributes.sensitivity.report_id);
295         }
296 
297         return ret;
298 }
299 
300 /* Function to initialize the processing for usage id */
301 static int hid_accel_3d_probe(struct platform_device *pdev)
302 {
303         int ret = 0;
304         static const char *name = "accel_3d";
305         struct iio_dev *indio_dev;
306         struct accel_3d_state *accel_state;
307         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
308         struct iio_chan_spec *channels;
309 
310         indio_dev = devm_iio_device_alloc(&pdev->dev,
311                                           sizeof(struct accel_3d_state));
312         if (indio_dev == NULL)
313                 return -ENOMEM;
314 
315         platform_set_drvdata(pdev, indio_dev);
316 
317         accel_state = iio_priv(indio_dev);
318         accel_state->common_attributes.hsdev = hsdev;
319         accel_state->common_attributes.pdev = pdev;
320 
321         ret = hid_sensor_parse_common_attributes(hsdev,
322                                         HID_USAGE_SENSOR_ACCEL_3D,
323                                         &accel_state->common_attributes);
324         if (ret) {
325                 dev_err(&pdev->dev, "failed to setup common attributes\n");
326                 return ret;
327         }
328 
329         channels = kmemdup(accel_3d_channels, sizeof(accel_3d_channels),
330                            GFP_KERNEL);
331         if (!channels) {
332                 dev_err(&pdev->dev, "failed to duplicate channels\n");
333                 return -ENOMEM;
334         }
335 
336         ret = accel_3d_parse_report(pdev, hsdev, channels,
337                                         HID_USAGE_SENSOR_ACCEL_3D, accel_state);
338         if (ret) {
339                 dev_err(&pdev->dev, "failed to setup attributes\n");
340                 goto error_free_dev_mem;
341         }
342 
343         indio_dev->channels = channels;
344         indio_dev->num_channels = ARRAY_SIZE(accel_3d_channels);
345         indio_dev->dev.parent = &pdev->dev;
346         indio_dev->info = &accel_3d_info;
347         indio_dev->name = name;
348         indio_dev->modes = INDIO_DIRECT_MODE;
349 
350         ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
351                 NULL, NULL);
352         if (ret) {
353                 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
354                 goto error_free_dev_mem;
355         }
356         atomic_set(&accel_state->common_attributes.data_ready, 0);
357         ret = hid_sensor_setup_trigger(indio_dev, name,
358                                         &accel_state->common_attributes);
359         if (ret < 0) {
360                 dev_err(&pdev->dev, "trigger setup failed\n");
361                 goto error_unreg_buffer_funcs;
362         }
363 
364         ret = iio_device_register(indio_dev);
365         if (ret) {
366                 dev_err(&pdev->dev, "device register failed\n");
367                 goto error_remove_trigger;
368         }
369 
370         accel_state->callbacks.send_event = accel_3d_proc_event;
371         accel_state->callbacks.capture_sample = accel_3d_capture_sample;
372         accel_state->callbacks.pdev = pdev;
373         ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ACCEL_3D,
374                                         &accel_state->callbacks);
375         if (ret < 0) {
376                 dev_err(&pdev->dev, "callback reg failed\n");
377                 goto error_iio_unreg;
378         }
379 
380         return ret;
381 
382 error_iio_unreg:
383         iio_device_unregister(indio_dev);
384 error_remove_trigger:
385         hid_sensor_remove_trigger(&accel_state->common_attributes);
386 error_unreg_buffer_funcs:
387         iio_triggered_buffer_cleanup(indio_dev);
388 error_free_dev_mem:
389         kfree(indio_dev->channels);
390         return ret;
391 }
392 
393 /* Function to deinitialize the processing for usage id */
394 static int hid_accel_3d_remove(struct platform_device *pdev)
395 {
396         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
397         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
398         struct accel_3d_state *accel_state = iio_priv(indio_dev);
399 
400         sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ACCEL_3D);
401         iio_device_unregister(indio_dev);
402         hid_sensor_remove_trigger(&accel_state->common_attributes);
403         iio_triggered_buffer_cleanup(indio_dev);
404         kfree(indio_dev->channels);
405 
406         return 0;
407 }
408 
409 static struct platform_device_id hid_accel_3d_ids[] = {
410         {
411                 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
412                 .name = "HID-SENSOR-200073",
413         },
414         { /* sentinel */ }
415 };
416 MODULE_DEVICE_TABLE(platform, hid_accel_3d_ids);
417 
418 static struct platform_driver hid_accel_3d_platform_driver = {
419         .id_table = hid_accel_3d_ids,
420         .driver = {
421                 .name   = KBUILD_MODNAME,
422         },
423         .probe          = hid_accel_3d_probe,
424         .remove         = hid_accel_3d_remove,
425 };
426 module_platform_driver(hid_accel_3d_platform_driver);
427 
428 MODULE_DESCRIPTION("HID Sensor Accel 3D");
429 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
430 MODULE_LICENSE("GPL");
431 

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