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/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 
115         *val = 0;
116         *val2 = 0;
117         switch (mask) {
118         case 0:
119                 hid_sensor_power_state(&accel_state->common_attributes, true);
120                 report_id = accel_state->accel[chan->scan_index].report_id;
121                 address = accel_3d_addresses[chan->scan_index];
122                 if (report_id >= 0)
123                         *val = sensor_hub_input_attr_get_raw_value(
124                                         accel_state->common_attributes.hsdev,
125                                         HID_USAGE_SENSOR_ACCEL_3D, address,
126                                         report_id);
127                 else {
128                         *val = 0;
129                         hid_sensor_power_state(&accel_state->common_attributes,
130                                                  false);
131                         return -EINVAL;
132                 }
133                 hid_sensor_power_state(&accel_state->common_attributes, false);
134                 ret_type = IIO_VAL_INT;
135                 break;
136         case IIO_CHAN_INFO_SCALE:
137                 *val = accel_state->scale_pre_decml;
138                 *val2 = accel_state->scale_post_decml;
139                 ret_type = accel_state->scale_precision;
140                 break;
141         case IIO_CHAN_INFO_OFFSET:
142                 *val = accel_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                         &accel_state->common_attributes, val, val2);
148                 break;
149         case IIO_CHAN_INFO_HYSTERESIS:
150                 ret_type = hid_sensor_read_raw_hyst_value(
151                         &accel_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 accel_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 accel_3d_state *accel_state = iio_priv(indio_dev);
169         int ret = 0;
170 
171         switch (mask) {
172         case IIO_CHAN_INFO_SAMP_FREQ:
173                 ret = hid_sensor_write_samp_freq_value(
174                                 &accel_state->common_attributes, val, val2);
175                 break;
176         case IIO_CHAN_INFO_HYSTERESIS:
177                 ret = hid_sensor_write_raw_hyst_value(
178                                 &accel_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 accel_3d_info = {
188         .driver_module = THIS_MODULE,
189         .read_raw = &accel_3d_read_raw,
190         .write_raw = &accel_3d_write_raw,
191 };
192 
193 /* Function to push data to buffer */
194 static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
195         int len)
196 {
197         dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
198         iio_push_to_buffers(indio_dev, data);
199 }
200 
201 /* Callback handler to send event after all samples are received and captured */
202 static int accel_3d_proc_event(struct hid_sensor_hub_device *hsdev,
203                                 unsigned usage_id,
204                                 void *priv)
205 {
206         struct iio_dev *indio_dev = platform_get_drvdata(priv);
207         struct accel_3d_state *accel_state = iio_priv(indio_dev);
208 
209         dev_dbg(&indio_dev->dev, "accel_3d_proc_event\n");
210         if (atomic_read(&accel_state->common_attributes.data_ready))
211                 hid_sensor_push_data(indio_dev,
212                                 accel_state->accel_val,
213                                 sizeof(accel_state->accel_val));
214 
215         return 0;
216 }
217 
218 /* Capture samples in local storage */
219 static int accel_3d_capture_sample(struct hid_sensor_hub_device *hsdev,
220                                 unsigned usage_id,
221                                 size_t raw_len, char *raw_data,
222                                 void *priv)
223 {
224         struct iio_dev *indio_dev = platform_get_drvdata(priv);
225         struct accel_3d_state *accel_state = iio_priv(indio_dev);
226         int offset;
227         int ret = -EINVAL;
228 
229         switch (usage_id) {
230         case HID_USAGE_SENSOR_ACCEL_X_AXIS:
231         case HID_USAGE_SENSOR_ACCEL_Y_AXIS:
232         case HID_USAGE_SENSOR_ACCEL_Z_AXIS:
233                 offset = usage_id - HID_USAGE_SENSOR_ACCEL_X_AXIS;
234                 accel_state->accel_val[CHANNEL_SCAN_INDEX_X + offset] =
235                                                 *(u32 *)raw_data;
236                 ret = 0;
237         break;
238         default:
239                 break;
240         }
241 
242         return ret;
243 }
244 
245 /* Parse report which is specific to an usage id*/
246 static int accel_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 accel_3d_state *st)
251 {
252         int ret;
253         int i;
254 
255         for (i = 0; i <= CHANNEL_SCAN_INDEX_Z; ++i) {
256                 ret = sensor_hub_input_get_attribute_info(hsdev,
257                                 HID_INPUT_REPORT,
258                                 usage_id,
259                                 HID_USAGE_SENSOR_ACCEL_X_AXIS + i,
260                                 &st->accel[CHANNEL_SCAN_INDEX_X + i]);
261                 if (ret < 0)
262                         break;
263                 accel_3d_adjust_channel_bit_mask(channels,
264                                 CHANNEL_SCAN_INDEX_X + i,
265                                 st->accel[CHANNEL_SCAN_INDEX_X + i].size);
266         }
267         dev_dbg(&pdev->dev, "accel_3d %x:%x, %x:%x, %x:%x\n",
268                         st->accel[0].index,
269                         st->accel[0].report_id,
270                         st->accel[1].index, st->accel[1].report_id,
271                         st->accel[2].index, st->accel[2].report_id);
272 
273         st->scale_precision = hid_sensor_format_scale(
274                                 HID_USAGE_SENSOR_ACCEL_3D,
275                                 &st->accel[CHANNEL_SCAN_INDEX_X],
276                                 &st->scale_pre_decml, &st->scale_post_decml);
277 
278         /* Set Sensitivity field ids, when there is no individual modifier */
279         if (st->common_attributes.sensitivity.index < 0) {
280                 sensor_hub_input_get_attribute_info(hsdev,
281                         HID_FEATURE_REPORT, usage_id,
282                         HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
283                         HID_USAGE_SENSOR_DATA_ACCELERATION,
284                         &st->common_attributes.sensitivity);
285                 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
286                         st->common_attributes.sensitivity.index,
287                         st->common_attributes.sensitivity.report_id);
288         }
289 
290         return ret;
291 }
292 
293 /* Function to initialize the processing for usage id */
294 static int hid_accel_3d_probe(struct platform_device *pdev)
295 {
296         int ret = 0;
297         static const char *name = "accel_3d";
298         struct iio_dev *indio_dev;
299         struct accel_3d_state *accel_state;
300         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
301         struct iio_chan_spec *channels;
302 
303         indio_dev = devm_iio_device_alloc(&pdev->dev,
304                                           sizeof(struct accel_3d_state));
305         if (indio_dev == NULL)
306                 return -ENOMEM;
307 
308         platform_set_drvdata(pdev, indio_dev);
309 
310         accel_state = iio_priv(indio_dev);
311         accel_state->common_attributes.hsdev = hsdev;
312         accel_state->common_attributes.pdev = pdev;
313 
314         ret = hid_sensor_parse_common_attributes(hsdev,
315                                         HID_USAGE_SENSOR_ACCEL_3D,
316                                         &accel_state->common_attributes);
317         if (ret) {
318                 dev_err(&pdev->dev, "failed to setup common attributes\n");
319                 return ret;
320         }
321 
322         channels = kmemdup(accel_3d_channels, sizeof(accel_3d_channels),
323                            GFP_KERNEL);
324         if (!channels) {
325                 dev_err(&pdev->dev, "failed to duplicate channels\n");
326                 return -ENOMEM;
327         }
328 
329         ret = accel_3d_parse_report(pdev, hsdev, channels,
330                                         HID_USAGE_SENSOR_ACCEL_3D, accel_state);
331         if (ret) {
332                 dev_err(&pdev->dev, "failed to setup attributes\n");
333                 goto error_free_dev_mem;
334         }
335 
336         indio_dev->channels = channels;
337         indio_dev->num_channels = ARRAY_SIZE(accel_3d_channels);
338         indio_dev->dev.parent = &pdev->dev;
339         indio_dev->info = &accel_3d_info;
340         indio_dev->name = name;
341         indio_dev->modes = INDIO_DIRECT_MODE;
342 
343         ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
344                 NULL, NULL);
345         if (ret) {
346                 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
347                 goto error_free_dev_mem;
348         }
349         atomic_set(&accel_state->common_attributes.data_ready, 0);
350         ret = hid_sensor_setup_trigger(indio_dev, name,
351                                         &accel_state->common_attributes);
352         if (ret < 0) {
353                 dev_err(&pdev->dev, "trigger setup failed\n");
354                 goto error_unreg_buffer_funcs;
355         }
356 
357         ret = iio_device_register(indio_dev);
358         if (ret) {
359                 dev_err(&pdev->dev, "device register failed\n");
360                 goto error_remove_trigger;
361         }
362 
363         accel_state->callbacks.send_event = accel_3d_proc_event;
364         accel_state->callbacks.capture_sample = accel_3d_capture_sample;
365         accel_state->callbacks.pdev = pdev;
366         ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ACCEL_3D,
367                                         &accel_state->callbacks);
368         if (ret < 0) {
369                 dev_err(&pdev->dev, "callback reg failed\n");
370                 goto error_iio_unreg;
371         }
372 
373         return ret;
374 
375 error_iio_unreg:
376         iio_device_unregister(indio_dev);
377 error_remove_trigger:
378         hid_sensor_remove_trigger(&accel_state->common_attributes);
379 error_unreg_buffer_funcs:
380         iio_triggered_buffer_cleanup(indio_dev);
381 error_free_dev_mem:
382         kfree(indio_dev->channels);
383         return ret;
384 }
385 
386 /* Function to deinitialize the processing for usage id */
387 static int hid_accel_3d_remove(struct platform_device *pdev)
388 {
389         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
390         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
391         struct accel_3d_state *accel_state = iio_priv(indio_dev);
392 
393         sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ACCEL_3D);
394         iio_device_unregister(indio_dev);
395         hid_sensor_remove_trigger(&accel_state->common_attributes);
396         iio_triggered_buffer_cleanup(indio_dev);
397         kfree(indio_dev->channels);
398 
399         return 0;
400 }
401 
402 static struct platform_device_id hid_accel_3d_ids[] = {
403         {
404                 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
405                 .name = "HID-SENSOR-200073",
406         },
407         { /* sentinel */ }
408 };
409 MODULE_DEVICE_TABLE(platform, hid_accel_3d_ids);
410 
411 static struct platform_driver hid_accel_3d_platform_driver = {
412         .id_table = hid_accel_3d_ids,
413         .driver = {
414                 .name   = KBUILD_MODNAME,
415                 .pm     = &hid_sensor_pm_ops,
416         },
417         .probe          = hid_accel_3d_probe,
418         .remove         = hid_accel_3d_remove,
419 };
420 module_platform_driver(hid_accel_3d_platform_driver);
421 
422 MODULE_DESCRIPTION("HID Sensor Accel 3D");
423 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
424 MODULE_LICENSE("GPL");
425 

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