3 * Copyright (c) 2014, 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
18 #include <linux/device.h>
19 #include <linux/platform_device.h>
20 #include <linux/module.h>
21 #include <linux/interrupt.h>
22 #include <linux/irq.h>
23 #include <linux/slab.h>
24 #include <linux/delay.h>
25 #include <linux/hid-sensor-hub.h>
26 #include <linux/iio/iio.h>
27 #include <linux/iio/sysfs.h>
28 #include <linux/iio/buffer.h>
29 #include <linux/iio/trigger_consumer.h>
30 #include <linux/iio/triggered_buffer.h>
31 #include "../common/hid-sensors/hid-sensor-trigger.h"
33 #define CHANNEL_SCAN_INDEX_PRESSURE 0
36 struct hid_sensor_hub_callbacks callbacks;
37 struct hid_sensor_common common_attributes;
38 struct hid_sensor_hub_attribute_info press_attr;
46 /* Channel definitions */
47 static const struct iio_chan_spec press_channels[] = {
51 .channel2 = IIO_NO_MOD,
52 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
53 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
54 BIT(IIO_CHAN_INFO_SCALE) |
55 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
56 BIT(IIO_CHAN_INFO_HYSTERESIS),
57 .scan_index = CHANNEL_SCAN_INDEX_PRESSURE,
61 /* Adjust channel real bits based on report descriptor */
62 static void press_adjust_channel_bit_mask(struct iio_chan_spec *channels,
63 int channel, int size)
65 channels[channel].scan_type.sign = 's';
66 /* Real storage bits will change based on the report desc. */
67 channels[channel].scan_type.realbits = size * 8;
68 /* Maximum size of a sample to capture is u32 */
69 channels[channel].scan_type.storagebits = sizeof(u32) * 8;
72 /* Channel read_raw handler */
73 static int press_read_raw(struct iio_dev *indio_dev,
74 struct iio_chan_spec const *chan,
78 struct press_state *press_state = iio_priv(indio_dev);
86 case IIO_CHAN_INFO_RAW:
87 switch (chan->scan_index) {
88 case CHANNEL_SCAN_INDEX_PRESSURE:
89 report_id = press_state->press_attr.report_id;
91 HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE;
98 hid_sensor_power_state(&press_state->common_attributes,
100 *val = sensor_hub_input_attr_get_raw_value(
101 press_state->common_attributes.hsdev,
102 HID_USAGE_SENSOR_PRESSURE, address,
105 hid_sensor_power_state(&press_state->common_attributes,
111 ret_type = IIO_VAL_INT;
113 case IIO_CHAN_INFO_SCALE:
114 *val = press_state->scale_pre_decml;
115 *val2 = press_state->scale_post_decml;
116 ret_type = press_state->scale_precision;
118 case IIO_CHAN_INFO_OFFSET:
119 *val = press_state->value_offset;
120 ret_type = IIO_VAL_INT;
122 case IIO_CHAN_INFO_SAMP_FREQ:
123 ret_type = hid_sensor_read_samp_freq_value(
124 &press_state->common_attributes, val, val2);
126 case IIO_CHAN_INFO_HYSTERESIS:
127 ret_type = hid_sensor_read_raw_hyst_value(
128 &press_state->common_attributes, val, val2);
138 /* Channel write_raw handler */
139 static int press_write_raw(struct iio_dev *indio_dev,
140 struct iio_chan_spec const *chan,
145 struct press_state *press_state = iio_priv(indio_dev);
149 case IIO_CHAN_INFO_SAMP_FREQ:
150 ret = hid_sensor_write_samp_freq_value(
151 &press_state->common_attributes, val, val2);
153 case IIO_CHAN_INFO_HYSTERESIS:
154 ret = hid_sensor_write_raw_hyst_value(
155 &press_state->common_attributes, val, val2);
164 static const struct iio_info press_info = {
165 .driver_module = THIS_MODULE,
166 .read_raw = &press_read_raw,
167 .write_raw = &press_write_raw,
170 /* Function to push data to buffer */
171 static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
174 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
175 iio_push_to_buffers(indio_dev, data);
178 /* Callback handler to send event after all samples are received and captured */
179 static int press_proc_event(struct hid_sensor_hub_device *hsdev,
183 struct iio_dev *indio_dev = platform_get_drvdata(priv);
184 struct press_state *press_state = iio_priv(indio_dev);
186 dev_dbg(&indio_dev->dev, "press_proc_event\n");
187 if (atomic_read(&press_state->common_attributes.data_ready))
188 hid_sensor_push_data(indio_dev,
189 &press_state->press_data,
190 sizeof(press_state->press_data));
195 /* Capture samples in local storage */
196 static int press_capture_sample(struct hid_sensor_hub_device *hsdev,
198 size_t raw_len, char *raw_data,
201 struct iio_dev *indio_dev = platform_get_drvdata(priv);
202 struct press_state *press_state = iio_priv(indio_dev);
206 case HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE:
207 press_state->press_data = *(u32 *)raw_data;
217 /* Parse report which is specific to an usage id*/
218 static int press_parse_report(struct platform_device *pdev,
219 struct hid_sensor_hub_device *hsdev,
220 struct iio_chan_spec *channels,
222 struct press_state *st)
226 ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
228 HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE,
232 press_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESSURE,
233 st->press_attr.size);
235 dev_dbg(&pdev->dev, "press %x:%x\n", st->press_attr.index,
236 st->press_attr.report_id);
238 st->scale_precision = hid_sensor_format_scale(
239 HID_USAGE_SENSOR_PRESSURE,
241 &st->scale_pre_decml, &st->scale_post_decml);
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_ATMOSPHERIC_PRESSURE,
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);
257 /* Function to initialize the processing for usage id */
258 static int hid_press_probe(struct platform_device *pdev)
261 static const char *name = "press";
262 struct iio_dev *indio_dev;
263 struct press_state *press_state;
264 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
265 struct iio_chan_spec *channels;
267 indio_dev = devm_iio_device_alloc(&pdev->dev,
268 sizeof(struct press_state));
271 platform_set_drvdata(pdev, indio_dev);
273 press_state = iio_priv(indio_dev);
274 press_state->common_attributes.hsdev = hsdev;
275 press_state->common_attributes.pdev = pdev;
277 ret = hid_sensor_parse_common_attributes(hsdev,
278 HID_USAGE_SENSOR_PRESSURE,
279 &press_state->common_attributes);
281 dev_err(&pdev->dev, "failed to setup common attributes\n");
285 channels = kmemdup(press_channels, sizeof(press_channels), GFP_KERNEL);
287 dev_err(&pdev->dev, "failed to duplicate channels\n");
291 ret = press_parse_report(pdev, hsdev, channels,
292 HID_USAGE_SENSOR_PRESSURE, press_state);
294 dev_err(&pdev->dev, "failed to setup attributes\n");
295 goto error_free_dev_mem;
298 indio_dev->channels = channels;
299 indio_dev->num_channels =
300 ARRAY_SIZE(press_channels);
301 indio_dev->dev.parent = &pdev->dev;
302 indio_dev->info = &press_info;
303 indio_dev->name = name;
304 indio_dev->modes = INDIO_DIRECT_MODE;
306 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
309 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
310 goto error_free_dev_mem;
312 atomic_set(&press_state->common_attributes.data_ready, 0);
313 ret = hid_sensor_setup_trigger(indio_dev, name,
314 &press_state->common_attributes);
316 dev_err(&pdev->dev, "trigger setup failed\n");
317 goto error_unreg_buffer_funcs;
320 ret = iio_device_register(indio_dev);
322 dev_err(&pdev->dev, "device register failed\n");
323 goto error_remove_trigger;
326 press_state->callbacks.send_event = press_proc_event;
327 press_state->callbacks.capture_sample = press_capture_sample;
328 press_state->callbacks.pdev = pdev;
329 ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PRESSURE,
330 &press_state->callbacks);
332 dev_err(&pdev->dev, "callback reg failed\n");
333 goto error_iio_unreg;
339 iio_device_unregister(indio_dev);
340 error_remove_trigger:
341 hid_sensor_remove_trigger(&press_state->common_attributes);
342 error_unreg_buffer_funcs:
343 iio_triggered_buffer_cleanup(indio_dev);
345 kfree(indio_dev->channels);
349 /* Function to deinitialize the processing for usage id */
350 static int hid_press_remove(struct platform_device *pdev)
352 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
353 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
354 struct press_state *press_state = iio_priv(indio_dev);
356 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PRESSURE);
357 iio_device_unregister(indio_dev);
358 hid_sensor_remove_trigger(&press_state->common_attributes);
359 iio_triggered_buffer_cleanup(indio_dev);
360 kfree(indio_dev->channels);
365 static const struct platform_device_id hid_press_ids[] = {
367 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
368 .name = "HID-SENSOR-200031",
372 MODULE_DEVICE_TABLE(platform, hid_press_ids);
374 static struct platform_driver hid_press_platform_driver = {
375 .id_table = hid_press_ids,
377 .name = KBUILD_MODNAME,
378 .pm = &hid_sensor_pm_ops,
380 .probe = hid_press_probe,
381 .remove = hid_press_remove,
383 module_platform_driver(hid_press_platform_driver);
385 MODULE_DESCRIPTION("HID Sensor Pressure");
386 MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>");
387 MODULE_LICENSE("GPL");