3 * Copyright (c) 2012, Intel Corporation.
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.
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
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.
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"
34 #define CHANNEL_SCAN_INDEX_ILLUM 0
37 struct hid_sensor_hub_callbacks callbacks;
38 struct hid_sensor_common common_attributes;
39 struct hid_sensor_hub_attribute_info als_illum;
47 /* Channel definitions */
48 static const struct iio_chan_spec als_channels[] = {
50 .type = IIO_INTENSITY,
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,
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)
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;
73 /* Channel read_raw handler */
74 static int als_read_raw(struct iio_dev *indio_dev,
75 struct iio_chan_spec const *chan,
79 struct als_state *als_state = iio_priv(indio_dev);
89 switch (chan->scan_index) {
90 case CHANNEL_SCAN_INDEX_ILLUM:
91 report_id = als_state->als_illum.report_id;
93 HID_USAGE_SENSOR_LIGHT_ILLUM;
100 poll_value = hid_sensor_read_poll_value(
101 &als_state->common_attributes);
105 hid_sensor_power_state(&als_state->common_attributes,
107 msleep_interruptible(poll_value * 2);
109 *val = sensor_hub_input_attr_get_raw_value(
110 als_state->common_attributes.hsdev,
111 HID_USAGE_SENSOR_ALS, address,
113 hid_sensor_power_state(&als_state->common_attributes,
119 ret_type = IIO_VAL_INT;
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;
126 case IIO_CHAN_INFO_OFFSET:
127 *val = als_state->value_offset;
128 ret_type = IIO_VAL_INT;
130 case IIO_CHAN_INFO_SAMP_FREQ:
131 ret_type = hid_sensor_read_samp_freq_value(
132 &als_state->common_attributes, val, val2);
134 case IIO_CHAN_INFO_HYSTERESIS:
135 ret_type = hid_sensor_read_raw_hyst_value(
136 &als_state->common_attributes, val, val2);
146 /* Channel write_raw handler */
147 static int als_write_raw(struct iio_dev *indio_dev,
148 struct iio_chan_spec const *chan,
153 struct als_state *als_state = iio_priv(indio_dev);
157 case IIO_CHAN_INFO_SAMP_FREQ:
158 ret = hid_sensor_write_samp_freq_value(
159 &als_state->common_attributes, val, val2);
161 case IIO_CHAN_INFO_HYSTERESIS:
162 ret = hid_sensor_write_raw_hyst_value(
163 &als_state->common_attributes, val, val2);
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,
178 /* Function to push data to buffer */
179 static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
182 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
183 iio_push_to_buffers(indio_dev, data);
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,
191 struct iio_dev *indio_dev = platform_get_drvdata(priv);
192 struct als_state *als_state = iio_priv(indio_dev);
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,
198 sizeof(als_state->illum));
203 /* Capture samples in local storage */
204 static int als_capture_sample(struct hid_sensor_hub_device *hsdev,
206 size_t raw_len, char *raw_data,
209 struct iio_dev *indio_dev = platform_get_drvdata(priv);
210 struct als_state *als_state = iio_priv(indio_dev);
214 case HID_USAGE_SENSOR_LIGHT_ILLUM:
215 als_state->illum = *(u32 *)raw_data;
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,
230 struct als_state *st)
234 ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
236 HID_USAGE_SENSOR_LIGHT_ILLUM,
240 als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_ILLUM,
243 dev_dbg(&pdev->dev, "als %x:%x\n", st->als_illum.index,
244 st->als_illum.report_id);
246 st->scale_precision = hid_sensor_format_scale(
247 HID_USAGE_SENSOR_ALS,
249 &st->scale_pre_decml, &st->scale_post_decml);
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);
265 /* Function to initialize the processing for usage id */
266 static int hid_als_probe(struct platform_device *pdev)
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;
275 indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct als_state));
278 platform_set_drvdata(pdev, indio_dev);
280 als_state = iio_priv(indio_dev);
281 als_state->common_attributes.hsdev = hsdev;
282 als_state->common_attributes.pdev = pdev;
284 ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_ALS,
285 &als_state->common_attributes);
287 dev_err(&pdev->dev, "failed to setup common attributes\n");
291 channels = kmemdup(als_channels, sizeof(als_channels), GFP_KERNEL);
293 dev_err(&pdev->dev, "failed to duplicate channels\n");
297 ret = als_parse_report(pdev, hsdev, channels,
298 HID_USAGE_SENSOR_ALS, als_state);
300 dev_err(&pdev->dev, "failed to setup attributes\n");
301 goto error_free_dev_mem;
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;
312 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
315 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
316 goto error_free_dev_mem;
318 atomic_set(&als_state->common_attributes.data_ready, 0);
319 ret = hid_sensor_setup_trigger(indio_dev, name,
320 &als_state->common_attributes);
322 dev_err(&pdev->dev, "trigger setup failed\n");
323 goto error_unreg_buffer_funcs;
326 ret = iio_device_register(indio_dev);
328 dev_err(&pdev->dev, "device register failed\n");
329 goto error_remove_trigger;
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);
338 dev_err(&pdev->dev, "callback reg failed\n");
339 goto 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);
351 kfree(indio_dev->channels);
355 /* Function to deinitialize the processing for usage id */
356 static int hid_als_remove(struct platform_device *pdev)
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);
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);
371 static struct platform_device_id hid_als_ids[] = {
373 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
374 .name = "HID-SENSOR-200041",
378 MODULE_DEVICE_TABLE(platform, hid_als_ids);
380 static struct platform_driver hid_als_platform_driver = {
381 .id_table = hid_als_ids,
383 .name = KBUILD_MODNAME,
384 .owner = THIS_MODULE,
386 .probe = hid_als_probe,
387 .remove = hid_als_remove,
389 module_platform_driver(hid_als_platform_driver);
391 MODULE_DESCRIPTION("HID Sensor ALS");
392 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
393 MODULE_LICENSE("GPL");