Version:  2.0.40 2.2.26 2.4.37 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 4.1

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 
 84         *val = 0;
 85         *val2 = 0;
 86         switch (mask) {
 87         case 0:
 88                 switch (chan->scan_index) {
 89                 case  CHANNEL_SCAN_INDEX_ILLUM:
 90                         report_id = als_state->als_illum.report_id;
 91                         address =
 92                         HID_USAGE_SENSOR_LIGHT_ILLUM;
 93                         break;
 94                 default:
 95                         report_id = -1;
 96                         break;
 97                 }
 98                 if (report_id >= 0) {
 99                         hid_sensor_power_state(&als_state->common_attributes,
100                                                 true);
101                         *val = sensor_hub_input_attr_get_raw_value(
102                                         als_state->common_attributes.hsdev,
103                                         HID_USAGE_SENSOR_ALS, address,
104                                         report_id,
105                                         SENSOR_HUB_SYNC);
106                         hid_sensor_power_state(&als_state->common_attributes,
107                                                 false);
108                 } else {
109                         *val = 0;
110                         return -EINVAL;
111                 }
112                 ret_type = IIO_VAL_INT;
113                 break;
114         case IIO_CHAN_INFO_SCALE:
115                 *val = als_state->scale_pre_decml;
116                 *val2 = als_state->scale_post_decml;
117                 ret_type = als_state->scale_precision;
118                 break;
119         case IIO_CHAN_INFO_OFFSET:
120                 *val = als_state->value_offset;
121                 ret_type = IIO_VAL_INT;
122                 break;
123         case IIO_CHAN_INFO_SAMP_FREQ:
124                 ret_type = hid_sensor_read_samp_freq_value(
125                                 &als_state->common_attributes, val, val2);
126                 break;
127         case IIO_CHAN_INFO_HYSTERESIS:
128                 ret_type = hid_sensor_read_raw_hyst_value(
129                                 &als_state->common_attributes, val, val2);
130                 break;
131         default:
132                 ret_type = -EINVAL;
133                 break;
134         }
135 
136         return ret_type;
137 }
138 
139 /* Channel write_raw handler */
140 static int als_write_raw(struct iio_dev *indio_dev,
141                                struct iio_chan_spec const *chan,
142                                int val,
143                                int val2,
144                                long mask)
145 {
146         struct als_state *als_state = iio_priv(indio_dev);
147         int ret = 0;
148 
149         switch (mask) {
150         case IIO_CHAN_INFO_SAMP_FREQ:
151                 ret = hid_sensor_write_samp_freq_value(
152                                 &als_state->common_attributes, val, val2);
153                 break;
154         case IIO_CHAN_INFO_HYSTERESIS:
155                 ret = hid_sensor_write_raw_hyst_value(
156                                 &als_state->common_attributes, val, val2);
157                 break;
158         default:
159                 ret = -EINVAL;
160         }
161 
162         return ret;
163 }
164 
165 static const struct iio_info als_info = {
166         .driver_module = THIS_MODULE,
167         .read_raw = &als_read_raw,
168         .write_raw = &als_write_raw,
169 };
170 
171 /* Function to push data to buffer */
172 static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
173                                         int len)
174 {
175         dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
176         iio_push_to_buffers(indio_dev, data);
177 }
178 
179 /* Callback handler to send event after all samples are received and captured */
180 static int als_proc_event(struct hid_sensor_hub_device *hsdev,
181                                 unsigned usage_id,
182                                 void *priv)
183 {
184         struct iio_dev *indio_dev = platform_get_drvdata(priv);
185         struct als_state *als_state = iio_priv(indio_dev);
186 
187         dev_dbg(&indio_dev->dev, "als_proc_event\n");
188         if (atomic_read(&als_state->common_attributes.data_ready))
189                 hid_sensor_push_data(indio_dev,
190                                 &als_state->illum,
191                                 sizeof(als_state->illum));
192 
193         return 0;
194 }
195 
196 /* Capture samples in local storage */
197 static int als_capture_sample(struct hid_sensor_hub_device *hsdev,
198                                 unsigned usage_id,
199                                 size_t raw_len, char *raw_data,
200                                 void *priv)
201 {
202         struct iio_dev *indio_dev = platform_get_drvdata(priv);
203         struct als_state *als_state = iio_priv(indio_dev);
204         int ret = -EINVAL;
205 
206         switch (usage_id) {
207         case HID_USAGE_SENSOR_LIGHT_ILLUM:
208                 als_state->illum = *(u32 *)raw_data;
209                 ret = 0;
210                 break;
211         default:
212                 break;
213         }
214 
215         return ret;
216 }
217 
218 /* Parse report which is specific to an usage id*/
219 static int als_parse_report(struct platform_device *pdev,
220                                 struct hid_sensor_hub_device *hsdev,
221                                 struct iio_chan_spec *channels,
222                                 unsigned usage_id,
223                                 struct als_state *st)
224 {
225         int ret;
226 
227         ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
228                         usage_id,
229                         HID_USAGE_SENSOR_LIGHT_ILLUM,
230                         &st->als_illum);
231         if (ret < 0)
232                 return ret;
233         als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_ILLUM,
234                                         st->als_illum.size);
235 
236         dev_dbg(&pdev->dev, "als %x:%x\n", st->als_illum.index,
237                         st->als_illum.report_id);
238 
239         st->scale_precision = hid_sensor_format_scale(
240                                 HID_USAGE_SENSOR_ALS,
241                                 &st->als_illum,
242                                 &st->scale_pre_decml, &st->scale_post_decml);
243 
244         /* Set Sensitivity field ids, when there is no individual modifier */
245         if (st->common_attributes.sensitivity.index < 0) {
246                 sensor_hub_input_get_attribute_info(hsdev,
247                         HID_FEATURE_REPORT, usage_id,
248                         HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
249                         HID_USAGE_SENSOR_DATA_LIGHT,
250                         &st->common_attributes.sensitivity);
251                 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
252                         st->common_attributes.sensitivity.index,
253                         st->common_attributes.sensitivity.report_id);
254         }
255         return ret;
256 }
257 
258 /* Function to initialize the processing for usage id */
259 static int hid_als_probe(struct platform_device *pdev)
260 {
261         int ret = 0;
262         static const char *name = "als";
263         struct iio_dev *indio_dev;
264         struct als_state *als_state;
265         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
266         struct iio_chan_spec *channels;
267 
268         indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct als_state));
269         if (!indio_dev)
270                 return -ENOMEM;
271         platform_set_drvdata(pdev, indio_dev);
272 
273         als_state = iio_priv(indio_dev);
274         als_state->common_attributes.hsdev = hsdev;
275         als_state->common_attributes.pdev = pdev;
276 
277         ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_ALS,
278                                         &als_state->common_attributes);
279         if (ret) {
280                 dev_err(&pdev->dev, "failed to setup common attributes\n");
281                 return ret;
282         }
283 
284         channels = kmemdup(als_channels, sizeof(als_channels), GFP_KERNEL);
285         if (!channels) {
286                 dev_err(&pdev->dev, "failed to duplicate channels\n");
287                 return -ENOMEM;
288         }
289 
290         ret = als_parse_report(pdev, hsdev, channels,
291                                 HID_USAGE_SENSOR_ALS, als_state);
292         if (ret) {
293                 dev_err(&pdev->dev, "failed to setup attributes\n");
294                 goto error_free_dev_mem;
295         }
296 
297         indio_dev->channels = channels;
298         indio_dev->num_channels =
299                                 ARRAY_SIZE(als_channels);
300         indio_dev->dev.parent = &pdev->dev;
301         indio_dev->info = &als_info;
302         indio_dev->name = name;
303         indio_dev->modes = INDIO_DIRECT_MODE;
304 
305         ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
306                 NULL, NULL);
307         if (ret) {
308                 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
309                 goto error_free_dev_mem;
310         }
311         atomic_set(&als_state->common_attributes.data_ready, 0);
312         ret = hid_sensor_setup_trigger(indio_dev, name,
313                                 &als_state->common_attributes);
314         if (ret < 0) {
315                 dev_err(&pdev->dev, "trigger setup failed\n");
316                 goto error_unreg_buffer_funcs;
317         }
318 
319         ret = iio_device_register(indio_dev);
320         if (ret) {
321                 dev_err(&pdev->dev, "device register failed\n");
322                 goto error_remove_trigger;
323         }
324 
325         als_state->callbacks.send_event = als_proc_event;
326         als_state->callbacks.capture_sample = als_capture_sample;
327         als_state->callbacks.pdev = pdev;
328         ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ALS,
329                                         &als_state->callbacks);
330         if (ret < 0) {
331                 dev_err(&pdev->dev, "callback reg failed\n");
332                 goto error_iio_unreg;
333         }
334 
335         return ret;
336 
337 error_iio_unreg:
338         iio_device_unregister(indio_dev);
339 error_remove_trigger:
340         hid_sensor_remove_trigger(&als_state->common_attributes);
341 error_unreg_buffer_funcs:
342         iio_triggered_buffer_cleanup(indio_dev);
343 error_free_dev_mem:
344         kfree(indio_dev->channels);
345         return ret;
346 }
347 
348 /* Function to deinitialize the processing for usage id */
349 static int hid_als_remove(struct platform_device *pdev)
350 {
351         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
352         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
353         struct als_state *als_state = iio_priv(indio_dev);
354 
355         sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ALS);
356         iio_device_unregister(indio_dev);
357         hid_sensor_remove_trigger(&als_state->common_attributes);
358         iio_triggered_buffer_cleanup(indio_dev);
359         kfree(indio_dev->channels);
360 
361         return 0;
362 }
363 
364 static struct platform_device_id hid_als_ids[] = {
365         {
366                 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
367                 .name = "HID-SENSOR-200041",
368         },
369         { /* sentinel */ }
370 };
371 MODULE_DEVICE_TABLE(platform, hid_als_ids);
372 
373 static struct platform_driver hid_als_platform_driver = {
374         .id_table = hid_als_ids,
375         .driver = {
376                 .name   = KBUILD_MODNAME,
377                 .pm     = &hid_sensor_pm_ops,
378         },
379         .probe          = hid_als_probe,
380         .remove         = hid_als_remove,
381 };
382 module_platform_driver(hid_als_platform_driver);
383 
384 MODULE_DESCRIPTION("HID Sensor ALS");
385 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
386 MODULE_LICENSE("GPL");
387 

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