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

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