Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 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

Linux/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                 .owner  = THIS_MODULE,
385         },
386         .probe          = hid_als_probe,
387         .remove         = hid_als_remove,
388 };
389 module_platform_driver(hid_als_platform_driver);
390 
391 MODULE_DESCRIPTION("HID Sensor ALS");
392 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
393 MODULE_LICENSE("GPL");
394 

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