3 * Copyright (c) 2017, 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
17 #include <linux/device.h>
18 #include <linux/hid-sensor-hub.h>
19 #include <linux/iio/buffer.h>
20 #include <linux/iio/iio.h>
21 #include <linux/iio/triggered_buffer.h>
22 #include <linux/iio/trigger_consumer.h>
23 #include <linux/module.h>
24 #include <linux/platform_device.h>
26 #include "../common/hid-sensors/hid-sensor-trigger.h"
28 struct temperature_state {
29 struct hid_sensor_common common_attributes;
30 struct hid_sensor_hub_attribute_info temperature_attr;
33 u64 timestamp __aligned(8);
41 /* Channel definitions */
42 static const struct iio_chan_spec temperature_channels[] = {
45 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
46 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
47 BIT(IIO_CHAN_INFO_SCALE) |
48 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
49 BIT(IIO_CHAN_INFO_HYSTERESIS),
51 IIO_CHAN_SOFT_TIMESTAMP(1),
54 /* Adjust channel real bits based on report descriptor */
55 static void temperature_adjust_channel_bit_mask(struct iio_chan_spec *channels,
56 int channel, int size)
58 channels[channel].scan_type.sign = 's';
59 /* Real storage bits will change based on the report desc. */
60 channels[channel].scan_type.realbits = size * 8;
61 /* Maximum size of a sample to capture is s32 */
62 channels[channel].scan_type.storagebits = sizeof(s32) * 8;
65 static int temperature_read_raw(struct iio_dev *indio_dev,
66 struct iio_chan_spec const *chan,
67 int *val, int *val2, long mask)
69 struct temperature_state *temp_st = iio_priv(indio_dev);
72 case IIO_CHAN_INFO_RAW:
73 if (chan->type != IIO_TEMP)
75 hid_sensor_power_state(
76 &temp_st->common_attributes, true);
77 *val = sensor_hub_input_attr_get_raw_value(
78 temp_st->common_attributes.hsdev,
79 HID_USAGE_SENSOR_TEMPERATURE,
80 HID_USAGE_SENSOR_DATA_ENVIRONMENTAL_TEMPERATURE,
81 temp_st->temperature_attr.report_id,
83 temp_st->temperature_attr.logical_minimum < 0);
84 hid_sensor_power_state(
85 &temp_st->common_attributes,
90 case IIO_CHAN_INFO_SCALE:
91 *val = temp_st->scale_pre_decml;
92 *val2 = temp_st->scale_post_decml;
93 return temp_st->scale_precision;
95 case IIO_CHAN_INFO_OFFSET:
96 *val = temp_st->value_offset;
99 case IIO_CHAN_INFO_SAMP_FREQ:
100 return hid_sensor_read_samp_freq_value(
101 &temp_st->common_attributes, val, val2);
103 case IIO_CHAN_INFO_HYSTERESIS:
104 return hid_sensor_read_raw_hyst_value(
105 &temp_st->common_attributes, val, val2);
111 static int temperature_write_raw(struct iio_dev *indio_dev,
112 struct iio_chan_spec const *chan,
113 int val, int val2, long mask)
115 struct temperature_state *temp_st = iio_priv(indio_dev);
118 case IIO_CHAN_INFO_SAMP_FREQ:
119 return hid_sensor_write_samp_freq_value(
120 &temp_st->common_attributes, val, val2);
121 case IIO_CHAN_INFO_HYSTERESIS:
122 return hid_sensor_write_raw_hyst_value(
123 &temp_st->common_attributes, val, val2);
129 static const struct iio_info temperature_info = {
130 .read_raw = &temperature_read_raw,
131 .write_raw = &temperature_write_raw,
134 /* Callback handler to send event after all samples are received and captured */
135 static int temperature_proc_event(struct hid_sensor_hub_device *hsdev,
136 unsigned int usage_id, void *pdev)
138 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
139 struct temperature_state *temp_st = iio_priv(indio_dev);
141 if (atomic_read(&temp_st->common_attributes.data_ready))
142 iio_push_to_buffers_with_timestamp(indio_dev, &temp_st->scan,
143 iio_get_time_ns(indio_dev));
148 /* Capture samples in local storage */
149 static int temperature_capture_sample(struct hid_sensor_hub_device *hsdev,
150 unsigned int usage_id, size_t raw_len,
151 char *raw_data, void *pdev)
153 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
154 struct temperature_state *temp_st = iio_priv(indio_dev);
157 case HID_USAGE_SENSOR_DATA_ENVIRONMENTAL_TEMPERATURE:
158 temp_st->scan.temperature_data = *(s32 *)raw_data;
165 /* Parse report which is specific to an usage id*/
166 static int temperature_parse_report(struct platform_device *pdev,
167 struct hid_sensor_hub_device *hsdev,
168 struct iio_chan_spec *channels,
169 unsigned int usage_id,
170 struct temperature_state *st)
174 ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
176 HID_USAGE_SENSOR_DATA_ENVIRONMENTAL_TEMPERATURE,
177 &st->temperature_attr);
181 temperature_adjust_channel_bit_mask(channels, 0,
182 st->temperature_attr.size);
184 st->scale_precision = hid_sensor_format_scale(
185 HID_USAGE_SENSOR_TEMPERATURE,
186 &st->temperature_attr,
187 &st->scale_pre_decml, &st->scale_post_decml);
189 /* Set Sensitivity field ids, when there is no individual modifier */
190 if (st->common_attributes.sensitivity.index < 0)
191 sensor_hub_input_get_attribute_info(hsdev,
192 HID_FEATURE_REPORT, usage_id,
193 HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
194 HID_USAGE_SENSOR_DATA_ENVIRONMENTAL_TEMPERATURE,
195 &st->common_attributes.sensitivity);
200 static struct hid_sensor_hub_callbacks temperature_callbacks = {
201 .send_event = &temperature_proc_event,
202 .capture_sample = &temperature_capture_sample,
205 /* Function to initialize the processing for usage id */
206 static int hid_temperature_probe(struct platform_device *pdev)
208 static const char *name = "temperature";
209 struct iio_dev *indio_dev;
210 struct temperature_state *temp_st;
211 struct iio_chan_spec *temp_chans;
212 struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
215 indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*temp_st));
219 temp_st = iio_priv(indio_dev);
220 temp_st->common_attributes.hsdev = hsdev;
221 temp_st->common_attributes.pdev = pdev;
223 ret = hid_sensor_parse_common_attributes(hsdev,
224 HID_USAGE_SENSOR_TEMPERATURE,
225 &temp_st->common_attributes);
229 temp_chans = devm_kmemdup(&indio_dev->dev, temperature_channels,
230 sizeof(temperature_channels), GFP_KERNEL);
234 ret = temperature_parse_report(pdev, hsdev, temp_chans,
235 HID_USAGE_SENSOR_TEMPERATURE, temp_st);
239 indio_dev->channels = temp_chans;
240 indio_dev->num_channels = ARRAY_SIZE(temperature_channels);
241 indio_dev->dev.parent = &pdev->dev;
242 indio_dev->info = &temperature_info;
243 indio_dev->name = name;
244 indio_dev->modes = INDIO_DIRECT_MODE;
246 ret = devm_iio_triggered_buffer_setup(&pdev->dev, indio_dev,
247 &iio_pollfunc_store_time, NULL, NULL);
251 atomic_set(&temp_st->common_attributes.data_ready, 0);
252 ret = hid_sensor_setup_trigger(indio_dev, name,
253 &temp_st->common_attributes);
257 platform_set_drvdata(pdev, indio_dev);
259 temperature_callbacks.pdev = pdev;
260 ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_TEMPERATURE,
261 &temperature_callbacks);
263 goto error_remove_trigger;
265 ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
267 goto error_remove_callback;
271 error_remove_callback:
272 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_TEMPERATURE);
273 error_remove_trigger:
274 hid_sensor_remove_trigger(&temp_st->common_attributes);
278 /* Function to deinitialize the processing for usage id */
279 static int hid_temperature_remove(struct platform_device *pdev)
281 struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
282 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
283 struct temperature_state *temp_st = iio_priv(indio_dev);
285 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_TEMPERATURE);
286 hid_sensor_remove_trigger(&temp_st->common_attributes);
291 static const struct platform_device_id hid_temperature_ids[] = {
293 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
294 .name = "HID-SENSOR-200033",
298 MODULE_DEVICE_TABLE(platform, hid_temperature_ids);
300 static struct platform_driver hid_temperature_platform_driver = {
301 .id_table = hid_temperature_ids,
303 .name = "temperature-sensor",
304 .pm = &hid_sensor_pm_ops,
306 .probe = hid_temperature_probe,
307 .remove = hid_temperature_remove,
309 module_platform_driver(hid_temperature_platform_driver);
311 MODULE_DESCRIPTION("HID Environmental temperature sensor");
312 MODULE_AUTHOR("Song Hongyan <hongyan.song@intel.com>");
313 MODULE_LICENSE("GPL v2");