1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * HID Sensors Driver
4 * Copyright (c) 2017, Intel Corporation.
5 */
6#include <linux/device.h>
7#include <linux/hid-sensor-hub.h>
8#include <linux/iio/buffer.h>
9#include <linux/iio/iio.h>
10#include <linux/module.h>
11#include <linux/mod_devicetable.h>
12#include <linux/platform_device.h>
13
14#include "../common/hid-sensors/hid-sensor-trigger.h"
15
16struct temperature_state {
17 struct hid_sensor_common common_attributes;
18 struct hid_sensor_hub_attribute_info temperature_attr;
19 struct {
20 s32 temperature_data;
21 u64 timestamp __aligned(8);
22 } scan;
23 int scale_pre_decml;
24 int scale_post_decml;
25 int scale_precision;
26 int value_offset;
27};
28
29static const u32 temperature_sensitivity_addresses[] = {
30 HID_USAGE_SENSOR_DATA_ENVIRONMENTAL_TEMPERATURE,
31};
32
33/* Channel definitions */
34static const struct iio_chan_spec temperature_channels[] = {
35 {
36 .type = IIO_TEMP,
37 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
38 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
39 BIT(IIO_CHAN_INFO_SCALE) |
40 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
41 BIT(IIO_CHAN_INFO_HYSTERESIS),
42 },
43 IIO_CHAN_SOFT_TIMESTAMP(1),
44};
45
46/* Adjust channel real bits based on report descriptor */
47static void temperature_adjust_channel_bit_mask(struct iio_chan_spec *channels,
48 int channel, int size)
49{
50 channels[channel].scan_type.sign = 's';
51 /* Real storage bits will change based on the report desc. */
52 channels[channel].scan_type.realbits = size * 8;
53 /* Maximum size of a sample to capture is s32 */
54 channels[channel].scan_type.storagebits = sizeof(s32) * 8;
55}
56
57static int temperature_read_raw(struct iio_dev *indio_dev,
58 struct iio_chan_spec const *chan,
59 int *val, int *val2, long mask)
60{
61 struct temperature_state *temp_st = iio_priv(indio_dev);
62
63 switch (mask) {
64 case IIO_CHAN_INFO_RAW:
65 if (chan->type != IIO_TEMP)
66 return -EINVAL;
67 hid_sensor_power_state(
68 st: &temp_st->common_attributes, state: true);
69 *val = sensor_hub_input_attr_get_raw_value(
70 hsdev: temp_st->common_attributes.hsdev,
71 HID_USAGE_SENSOR_TEMPERATURE,
72 HID_USAGE_SENSOR_DATA_ENVIRONMENTAL_TEMPERATURE,
73 report_id: temp_st->temperature_attr.report_id,
74 flag: SENSOR_HUB_SYNC,
75 is_signed: temp_st->temperature_attr.logical_minimum < 0);
76 hid_sensor_power_state(
77 st: &temp_st->common_attributes,
78 state: false);
79
80 return IIO_VAL_INT;
81
82 case IIO_CHAN_INFO_SCALE:
83 *val = temp_st->scale_pre_decml;
84 *val2 = temp_st->scale_post_decml;
85 return temp_st->scale_precision;
86
87 case IIO_CHAN_INFO_OFFSET:
88 *val = temp_st->value_offset;
89 return IIO_VAL_INT;
90
91 case IIO_CHAN_INFO_SAMP_FREQ:
92 return hid_sensor_read_samp_freq_value(
93 st: &temp_st->common_attributes, val1: val, val2);
94
95 case IIO_CHAN_INFO_HYSTERESIS:
96 return hid_sensor_read_raw_hyst_value(
97 st: &temp_st->common_attributes, val1: val, val2);
98 default:
99 return -EINVAL;
100 }
101}
102
103static int temperature_write_raw(struct iio_dev *indio_dev,
104 struct iio_chan_spec const *chan,
105 int val, int val2, long mask)
106{
107 struct temperature_state *temp_st = iio_priv(indio_dev);
108
109 switch (mask) {
110 case IIO_CHAN_INFO_SAMP_FREQ:
111 return hid_sensor_write_samp_freq_value(
112 st: &temp_st->common_attributes, val1: val, val2);
113 case IIO_CHAN_INFO_HYSTERESIS:
114 return hid_sensor_write_raw_hyst_value(
115 st: &temp_st->common_attributes, val1: val, val2);
116 default:
117 return -EINVAL;
118 }
119}
120
121static const struct iio_info temperature_info = {
122 .read_raw = &temperature_read_raw,
123 .write_raw = &temperature_write_raw,
124};
125
126/* Callback handler to send event after all samples are received and captured */
127static int temperature_proc_event(struct hid_sensor_hub_device *hsdev,
128 unsigned int usage_id, void *pdev)
129{
130 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
131 struct temperature_state *temp_st = iio_priv(indio_dev);
132
133 if (atomic_read(v: &temp_st->common_attributes.data_ready))
134 iio_push_to_buffers_with_timestamp(indio_dev, data: &temp_st->scan,
135 timestamp: iio_get_time_ns(indio_dev));
136
137 return 0;
138}
139
140/* Capture samples in local storage */
141static int temperature_capture_sample(struct hid_sensor_hub_device *hsdev,
142 unsigned int usage_id, size_t raw_len,
143 char *raw_data, void *pdev)
144{
145 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
146 struct temperature_state *temp_st = iio_priv(indio_dev);
147
148 switch (usage_id) {
149 case HID_USAGE_SENSOR_DATA_ENVIRONMENTAL_TEMPERATURE:
150 temp_st->scan.temperature_data = *(s32 *)raw_data;
151 return 0;
152 default:
153 return -EINVAL;
154 }
155}
156
157/* Parse report which is specific to an usage id*/
158static int temperature_parse_report(struct platform_device *pdev,
159 struct hid_sensor_hub_device *hsdev,
160 struct iio_chan_spec *channels,
161 unsigned int usage_id,
162 struct temperature_state *st)
163{
164 int ret;
165
166 ret = sensor_hub_input_get_attribute_info(hsdev, type: HID_INPUT_REPORT,
167 usage_id,
168 HID_USAGE_SENSOR_DATA_ENVIRONMENTAL_TEMPERATURE,
169 info: &st->temperature_attr);
170 if (ret < 0)
171 return ret;
172
173 temperature_adjust_channel_bit_mask(channels, channel: 0,
174 size: st->temperature_attr.size);
175
176 st->scale_precision = hid_sensor_format_scale(
177 HID_USAGE_SENSOR_TEMPERATURE,
178 attr_info: &st->temperature_attr,
179 val0: &st->scale_pre_decml, val1: &st->scale_post_decml);
180
181 return ret;
182}
183
184static struct hid_sensor_hub_callbacks temperature_callbacks = {
185 .send_event = &temperature_proc_event,
186 .capture_sample = &temperature_capture_sample,
187};
188
189/* Function to initialize the processing for usage id */
190static int hid_temperature_probe(struct platform_device *pdev)
191{
192 static const char *name = "temperature";
193 struct iio_dev *indio_dev;
194 struct temperature_state *temp_st;
195 struct iio_chan_spec *temp_chans;
196 struct hid_sensor_hub_device *hsdev = dev_get_platdata(dev: &pdev->dev);
197 int ret;
198
199 indio_dev = devm_iio_device_alloc(parent: &pdev->dev, sizeof_priv: sizeof(*temp_st));
200 if (!indio_dev)
201 return -ENOMEM;
202
203 temp_st = iio_priv(indio_dev);
204 temp_st->common_attributes.hsdev = hsdev;
205 temp_st->common_attributes.pdev = pdev;
206
207 ret = hid_sensor_parse_common_attributes(hsdev,
208 HID_USAGE_SENSOR_TEMPERATURE,
209 st: &temp_st->common_attributes,
210 sensitivity_addresses: temperature_sensitivity_addresses,
211 ARRAY_SIZE(temperature_sensitivity_addresses));
212 if (ret)
213 return ret;
214
215 temp_chans = devm_kmemdup(dev: &indio_dev->dev, src: temperature_channels,
216 len: sizeof(temperature_channels), GFP_KERNEL);
217 if (!temp_chans)
218 return -ENOMEM;
219
220 ret = temperature_parse_report(pdev, hsdev, channels: temp_chans,
221 HID_USAGE_SENSOR_TEMPERATURE, st: temp_st);
222 if (ret)
223 return ret;
224
225 indio_dev->channels = temp_chans;
226 indio_dev->num_channels = ARRAY_SIZE(temperature_channels);
227 indio_dev->info = &temperature_info;
228 indio_dev->name = name;
229 indio_dev->modes = INDIO_DIRECT_MODE;
230
231 atomic_set(v: &temp_st->common_attributes.data_ready, i: 0);
232
233 ret = hid_sensor_setup_trigger(indio_dev, name,
234 attrb: &temp_st->common_attributes);
235 if (ret)
236 return ret;
237
238 platform_set_drvdata(pdev, data: indio_dev);
239
240 temperature_callbacks.pdev = pdev;
241 ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_TEMPERATURE,
242 usage_callback: &temperature_callbacks);
243 if (ret)
244 goto error_remove_trigger;
245
246 ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
247 if (ret)
248 goto error_remove_callback;
249
250 return ret;
251
252error_remove_callback:
253 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_TEMPERATURE);
254error_remove_trigger:
255 hid_sensor_remove_trigger(indio_dev, attrb: &temp_st->common_attributes);
256 return ret;
257}
258
259/* Function to deinitialize the processing for usage id */
260static void hid_temperature_remove(struct platform_device *pdev)
261{
262 struct hid_sensor_hub_device *hsdev = dev_get_platdata(dev: &pdev->dev);
263 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
264 struct temperature_state *temp_st = iio_priv(indio_dev);
265
266 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_TEMPERATURE);
267 hid_sensor_remove_trigger(indio_dev, attrb: &temp_st->common_attributes);
268}
269
270static const struct platform_device_id hid_temperature_ids[] = {
271 {
272 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
273 .name = "HID-SENSOR-200033",
274 },
275 { /* sentinel */ }
276};
277MODULE_DEVICE_TABLE(platform, hid_temperature_ids);
278
279static struct platform_driver hid_temperature_platform_driver = {
280 .id_table = hid_temperature_ids,
281 .driver = {
282 .name = "temperature-sensor",
283 .pm = &hid_sensor_pm_ops,
284 },
285 .probe = hid_temperature_probe,
286 .remove_new = hid_temperature_remove,
287};
288module_platform_driver(hid_temperature_platform_driver);
289
290MODULE_DESCRIPTION("HID Environmental temperature sensor");
291MODULE_AUTHOR("Song Hongyan <hongyan.song@intel.com>");
292MODULE_LICENSE("GPL v2");
293MODULE_IMPORT_NS(IIO_HID);
294

source code of linux/drivers/iio/temperature/hid-sensor-temperature.c