1 // SPDX-License-Identifier: GPL-2.0-only
4 * Copyright (c) 2014, Intel Corporation.
6 #include <linux/device.h>
7 #include <linux/platform_device.h>
8 #include <linux/module.h>
9 #include <linux/interrupt.h>
10 #include <linux/irq.h>
11 #include <linux/slab.h>
12 #include <linux/delay.h>
13 #include <linux/hid-sensor-hub.h>
14 #include <linux/iio/iio.h>
15 #include <linux/iio/sysfs.h>
16 #include <linux/iio/buffer.h>
17 #include <linux/iio/trigger_consumer.h>
18 #include <linux/iio/triggered_buffer.h>
19 #include "../common/hid-sensors/hid-sensor-trigger.h"
21 #define CHANNEL_SCAN_INDEX_PRESSURE 0
24 struct hid_sensor_hub_callbacks callbacks;
25 struct hid_sensor_common common_attributes;
26 struct hid_sensor_hub_attribute_info press_attr;
34 /* Channel definitions */
35 static const struct iio_chan_spec press_channels[] = {
38 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
39 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
40 BIT(IIO_CHAN_INFO_SCALE) |
41 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
42 BIT(IIO_CHAN_INFO_HYSTERESIS),
43 .scan_index = CHANNEL_SCAN_INDEX_PRESSURE,
47 /* Adjust channel real bits based on report descriptor */
48 static void press_adjust_channel_bit_mask(struct iio_chan_spec *channels,
49 int channel, int size)
51 channels[channel].scan_type.sign = 's';
52 /* Real storage bits will change based on the report desc. */
53 channels[channel].scan_type.realbits = size * 8;
54 /* Maximum size of a sample to capture is u32 */
55 channels[channel].scan_type.storagebits = sizeof(u32) * 8;
58 /* Channel read_raw handler */
59 static int press_read_raw(struct iio_dev *indio_dev,
60 struct iio_chan_spec const *chan,
64 struct press_state *press_state = iio_priv(indio_dev);
73 case IIO_CHAN_INFO_RAW:
74 switch (chan->scan_index) {
75 case CHANNEL_SCAN_INDEX_PRESSURE:
76 report_id = press_state->press_attr.report_id;
77 min = press_state->press_attr.logical_minimum;
78 address = HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE;
85 hid_sensor_power_state(&press_state->common_attributes,
87 *val = sensor_hub_input_attr_get_raw_value(
88 press_state->common_attributes.hsdev,
89 HID_USAGE_SENSOR_PRESSURE, address,
93 hid_sensor_power_state(&press_state->common_attributes,
99 ret_type = IIO_VAL_INT;
101 case IIO_CHAN_INFO_SCALE:
102 *val = press_state->scale_pre_decml;
103 *val2 = press_state->scale_post_decml;
104 ret_type = press_state->scale_precision;
106 case IIO_CHAN_INFO_OFFSET:
107 *val = press_state->value_offset;
108 ret_type = IIO_VAL_INT;
110 case IIO_CHAN_INFO_SAMP_FREQ:
111 ret_type = hid_sensor_read_samp_freq_value(
112 &press_state->common_attributes, val, val2);
114 case IIO_CHAN_INFO_HYSTERESIS:
115 ret_type = hid_sensor_read_raw_hyst_value(
116 &press_state->common_attributes, val, val2);
126 /* Channel write_raw handler */
127 static int press_write_raw(struct iio_dev *indio_dev,
128 struct iio_chan_spec const *chan,
133 struct press_state *press_state = iio_priv(indio_dev);
137 case IIO_CHAN_INFO_SAMP_FREQ:
138 ret = hid_sensor_write_samp_freq_value(
139 &press_state->common_attributes, val, val2);
141 case IIO_CHAN_INFO_HYSTERESIS:
142 ret = hid_sensor_write_raw_hyst_value(
143 &press_state->common_attributes, val, val2);
152 static const struct iio_info press_info = {
153 .read_raw = &press_read_raw,
154 .write_raw = &press_write_raw,
157 /* Function to push data to buffer */
158 static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
161 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
162 iio_push_to_buffers(indio_dev, data);
165 /* Callback handler to send event after all samples are received and captured */
166 static int press_proc_event(struct hid_sensor_hub_device *hsdev,
170 struct iio_dev *indio_dev = platform_get_drvdata(priv);
171 struct press_state *press_state = iio_priv(indio_dev);
173 dev_dbg(&indio_dev->dev, "press_proc_event\n");
174 if (atomic_read(&press_state->common_attributes.data_ready))
175 hid_sensor_push_data(indio_dev,
176 &press_state->press_data,
177 sizeof(press_state->press_data));
182 /* Capture samples in local storage */
183 static int press_capture_sample(struct hid_sensor_hub_device *hsdev,
185 size_t raw_len, char *raw_data,
188 struct iio_dev *indio_dev = platform_get_drvdata(priv);
189 struct press_state *press_state = iio_priv(indio_dev);
193 case HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE:
194 press_state->press_data = *(u32 *)raw_data;
204 /* Parse report which is specific to an usage id*/
205 static int press_parse_report(struct platform_device *pdev,
206 struct hid_sensor_hub_device *hsdev,
207 struct iio_chan_spec *channels,
209 struct press_state *st)
213 ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
215 HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE,
219 press_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESSURE,
220 st->press_attr.size);
222 dev_dbg(&pdev->dev, "press %x:%x\n", st->press_attr.index,
223 st->press_attr.report_id);
225 st->scale_precision = hid_sensor_format_scale(
226 HID_USAGE_SENSOR_PRESSURE,
228 &st->scale_pre_decml, &st->scale_post_decml);
230 /* Set Sensitivity field ids, when there is no individual modifier */
231 if (st->common_attributes.sensitivity.index < 0) {
232 sensor_hub_input_get_attribute_info(hsdev,
233 HID_FEATURE_REPORT, usage_id,
234 HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
235 HID_USAGE_SENSOR_DATA_ATMOSPHERIC_PRESSURE,
236 &st->common_attributes.sensitivity);
237 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
238 st->common_attributes.sensitivity.index,
239 st->common_attributes.sensitivity.report_id);
244 /* Function to initialize the processing for usage id */
245 static int hid_press_probe(struct platform_device *pdev)
248 static const char *name = "press";
249 struct iio_dev *indio_dev;
250 struct press_state *press_state;
251 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
253 indio_dev = devm_iio_device_alloc(&pdev->dev,
254 sizeof(struct press_state));
257 platform_set_drvdata(pdev, indio_dev);
259 press_state = iio_priv(indio_dev);
260 press_state->common_attributes.hsdev = hsdev;
261 press_state->common_attributes.pdev = pdev;
263 ret = hid_sensor_parse_common_attributes(hsdev,
264 HID_USAGE_SENSOR_PRESSURE,
265 &press_state->common_attributes);
267 dev_err(&pdev->dev, "failed to setup common attributes\n");
271 indio_dev->channels = kmemdup(press_channels, sizeof(press_channels),
273 if (!indio_dev->channels) {
274 dev_err(&pdev->dev, "failed to duplicate channels\n");
278 ret = press_parse_report(pdev, hsdev,
279 (struct iio_chan_spec *)indio_dev->channels,
280 HID_USAGE_SENSOR_PRESSURE, press_state);
282 dev_err(&pdev->dev, "failed to setup attributes\n");
283 goto error_free_dev_mem;
286 indio_dev->num_channels =
287 ARRAY_SIZE(press_channels);
288 indio_dev->dev.parent = &pdev->dev;
289 indio_dev->info = &press_info;
290 indio_dev->name = name;
291 indio_dev->modes = INDIO_DIRECT_MODE;
293 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
296 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
297 goto error_free_dev_mem;
299 atomic_set(&press_state->common_attributes.data_ready, 0);
300 ret = hid_sensor_setup_trigger(indio_dev, name,
301 &press_state->common_attributes);
303 dev_err(&pdev->dev, "trigger setup failed\n");
304 goto error_unreg_buffer_funcs;
307 ret = iio_device_register(indio_dev);
309 dev_err(&pdev->dev, "device register failed\n");
310 goto error_remove_trigger;
313 press_state->callbacks.send_event = press_proc_event;
314 press_state->callbacks.capture_sample = press_capture_sample;
315 press_state->callbacks.pdev = pdev;
316 ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PRESSURE,
317 &press_state->callbacks);
319 dev_err(&pdev->dev, "callback reg failed\n");
320 goto error_iio_unreg;
326 iio_device_unregister(indio_dev);
327 error_remove_trigger:
328 hid_sensor_remove_trigger(&press_state->common_attributes);
329 error_unreg_buffer_funcs:
330 iio_triggered_buffer_cleanup(indio_dev);
332 kfree(indio_dev->channels);
336 /* Function to deinitialize the processing for usage id */
337 static int hid_press_remove(struct platform_device *pdev)
339 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
340 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
341 struct press_state *press_state = iio_priv(indio_dev);
343 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PRESSURE);
344 iio_device_unregister(indio_dev);
345 hid_sensor_remove_trigger(&press_state->common_attributes);
346 iio_triggered_buffer_cleanup(indio_dev);
347 kfree(indio_dev->channels);
352 static const struct platform_device_id hid_press_ids[] = {
354 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
355 .name = "HID-SENSOR-200031",
359 MODULE_DEVICE_TABLE(platform, hid_press_ids);
361 static struct platform_driver hid_press_platform_driver = {
362 .id_table = hid_press_ids,
364 .name = KBUILD_MODNAME,
365 .pm = &hid_sensor_pm_ops,
367 .probe = hid_press_probe,
368 .remove = hid_press_remove,
370 module_platform_driver(hid_press_platform_driver);
372 MODULE_DESCRIPTION("HID Sensor Pressure");
373 MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>");
374 MODULE_LICENSE("GPL");