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6#include <linux/device.h>
7#include <linux/platform_device.h>
8#include <linux/module.h>
9#include <linux/mod_devicetable.h>
10#include <linux/slab.h>
11#include <linux/hid-sensor-hub.h>
12#include <linux/iio/iio.h>
13#include <linux/iio/buffer.h>
14#include "../common/hid-sensors/hid-sensor-trigger.h"
15
16#define CHANNEL_SCAN_INDEX_PRESENCE 0
17
18struct prox_state {
19 struct hid_sensor_hub_callbacks callbacks;
20 struct hid_sensor_common common_attributes;
21 struct hid_sensor_hub_attribute_info prox_attr;
22 u32 human_presence;
23 int scale_pre_decml;
24 int scale_post_decml;
25 int scale_precision;
26};
27
28static const u32 prox_sensitivity_addresses[] = {
29 HID_USAGE_SENSOR_HUMAN_PRESENCE,
30 HID_USAGE_SENSOR_DATA_PRESENCE,
31};
32
33
34static const struct iio_chan_spec prox_channels[] = {
35 {
36 .type = IIO_PROXIMITY,
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 .scan_index = CHANNEL_SCAN_INDEX_PRESENCE,
43 }
44};
45
46
47static void prox_adjust_channel_bit_mask(struct iio_chan_spec *channels,
48 int channel, int size)
49{
50 channels[channel].scan_type.sign = 's';
51
52 channels[channel].scan_type.realbits = size * 8;
53
54 channels[channel].scan_type.storagebits = sizeof(u32) * 8;
55}
56
57
58static int prox_read_raw(struct iio_dev *indio_dev,
59 struct iio_chan_spec const *chan,
60 int *val, int *val2,
61 long mask)
62{
63 struct prox_state *prox_state = iio_priv(indio_dev);
64 int report_id = -1;
65 u32 address;
66 int ret_type;
67 s32 min;
68
69 *val = 0;
70 *val2 = 0;
71 switch (mask) {
72 case IIO_CHAN_INFO_RAW:
73 switch (chan->scan_index) {
74 case CHANNEL_SCAN_INDEX_PRESENCE:
75 report_id = prox_state->prox_attr.report_id;
76 min = prox_state->prox_attr.logical_minimum;
77 address = HID_USAGE_SENSOR_HUMAN_PRESENCE;
78 break;
79 default:
80 report_id = -1;
81 break;
82 }
83 if (report_id >= 0) {
84 hid_sensor_power_state(&prox_state->common_attributes,
85 true);
86 *val = sensor_hub_input_attr_get_raw_value(
87 prox_state->common_attributes.hsdev,
88 HID_USAGE_SENSOR_PROX, address,
89 report_id,
90 SENSOR_HUB_SYNC,
91 min < 0);
92 hid_sensor_power_state(&prox_state->common_attributes,
93 false);
94 } else {
95 *val = 0;
96 return -EINVAL;
97 }
98 ret_type = IIO_VAL_INT;
99 break;
100 case IIO_CHAN_INFO_SCALE:
101 *val = prox_state->scale_pre_decml;
102 *val2 = prox_state->scale_post_decml;
103 ret_type = prox_state->scale_precision;
104 break;
105 case IIO_CHAN_INFO_OFFSET:
106 *val = hid_sensor_convert_exponent(
107 prox_state->prox_attr.unit_expo);
108 ret_type = IIO_VAL_INT;
109 break;
110 case IIO_CHAN_INFO_SAMP_FREQ:
111 ret_type = hid_sensor_read_samp_freq_value(
112 &prox_state->common_attributes, val, val2);
113 break;
114 case IIO_CHAN_INFO_HYSTERESIS:
115 ret_type = hid_sensor_read_raw_hyst_value(
116 &prox_state->common_attributes, val, val2);
117 break;
118 default:
119 ret_type = -EINVAL;
120 break;
121 }
122
123 return ret_type;
124}
125
126
127static int prox_write_raw(struct iio_dev *indio_dev,
128 struct iio_chan_spec const *chan,
129 int val,
130 int val2,
131 long mask)
132{
133 struct prox_state *prox_state = iio_priv(indio_dev);
134 int ret = 0;
135
136 switch (mask) {
137 case IIO_CHAN_INFO_SAMP_FREQ:
138 ret = hid_sensor_write_samp_freq_value(
139 &prox_state->common_attributes, val, val2);
140 break;
141 case IIO_CHAN_INFO_HYSTERESIS:
142 ret = hid_sensor_write_raw_hyst_value(
143 &prox_state->common_attributes, val, val2);
144 break;
145 default:
146 ret = -EINVAL;
147 }
148
149 return ret;
150}
151
152static const struct iio_info prox_info = {
153 .read_raw = &prox_read_raw,
154 .write_raw = &prox_write_raw,
155};
156
157
158static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
159 int len)
160{
161 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
162 iio_push_to_buffers(indio_dev, data);
163}
164
165
166static int prox_proc_event(struct hid_sensor_hub_device *hsdev,
167 unsigned usage_id,
168 void *priv)
169{
170 struct iio_dev *indio_dev = platform_get_drvdata(priv);
171 struct prox_state *prox_state = iio_priv(indio_dev);
172
173 dev_dbg(&indio_dev->dev, "prox_proc_event\n");
174 if (atomic_read(&prox_state->common_attributes.data_ready))
175 hid_sensor_push_data(indio_dev,
176 &prox_state->human_presence,
177 sizeof(prox_state->human_presence));
178
179 return 0;
180}
181
182
183static int prox_capture_sample(struct hid_sensor_hub_device *hsdev,
184 unsigned usage_id,
185 size_t raw_len, char *raw_data,
186 void *priv)
187{
188 struct iio_dev *indio_dev = platform_get_drvdata(priv);
189 struct prox_state *prox_state = iio_priv(indio_dev);
190 int ret = -EINVAL;
191
192 switch (usage_id) {
193 case HID_USAGE_SENSOR_HUMAN_PRESENCE:
194 prox_state->human_presence = *(u32 *)raw_data;
195 ret = 0;
196 break;
197 default:
198 break;
199 }
200
201 return ret;
202}
203
204
205static int prox_parse_report(struct platform_device *pdev,
206 struct hid_sensor_hub_device *hsdev,
207 struct iio_chan_spec *channels,
208 unsigned usage_id,
209 struct prox_state *st)
210{
211 int ret;
212
213 ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
214 usage_id,
215 HID_USAGE_SENSOR_HUMAN_PRESENCE,
216 &st->prox_attr);
217 if (ret < 0)
218 return ret;
219 prox_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESENCE,
220 st->prox_attr.size);
221
222 dev_dbg(&pdev->dev, "prox %x:%x\n", st->prox_attr.index,
223 st->prox_attr.report_id);
224
225 return ret;
226}
227
228
229static int hid_prox_probe(struct platform_device *pdev)
230{
231 int ret = 0;
232 static const char *name = "prox";
233 struct iio_dev *indio_dev;
234 struct prox_state *prox_state;
235 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
236
237 indio_dev = devm_iio_device_alloc(&pdev->dev,
238 sizeof(struct prox_state));
239 if (!indio_dev)
240 return -ENOMEM;
241 platform_set_drvdata(pdev, indio_dev);
242
243 prox_state = iio_priv(indio_dev);
244 prox_state->common_attributes.hsdev = hsdev;
245 prox_state->common_attributes.pdev = pdev;
246
247 ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_PROX,
248 &prox_state->common_attributes,
249 prox_sensitivity_addresses,
250 ARRAY_SIZE(prox_sensitivity_addresses));
251 if (ret) {
252 dev_err(&pdev->dev, "failed to setup common attributes\n");
253 return ret;
254 }
255
256 indio_dev->channels = devm_kmemdup(&pdev->dev, prox_channels,
257 sizeof(prox_channels), GFP_KERNEL);
258 if (!indio_dev->channels) {
259 dev_err(&pdev->dev, "failed to duplicate channels\n");
260 return -ENOMEM;
261 }
262
263 ret = prox_parse_report(pdev, hsdev,
264 (struct iio_chan_spec *)indio_dev->channels,
265 HID_USAGE_SENSOR_PROX, prox_state);
266 if (ret) {
267 dev_err(&pdev->dev, "failed to setup attributes\n");
268 return ret;
269 }
270
271 indio_dev->num_channels = ARRAY_SIZE(prox_channels);
272 indio_dev->info = &prox_info;
273 indio_dev->name = name;
274 indio_dev->modes = INDIO_DIRECT_MODE;
275
276 atomic_set(&prox_state->common_attributes.data_ready, 0);
277
278 ret = hid_sensor_setup_trigger(indio_dev, name,
279 &prox_state->common_attributes);
280 if (ret) {
281 dev_err(&pdev->dev, "trigger setup failed\n");
282 return ret;
283 }
284
285 ret = iio_device_register(indio_dev);
286 if (ret) {
287 dev_err(&pdev->dev, "device register failed\n");
288 goto error_remove_trigger;
289 }
290
291 prox_state->callbacks.send_event = prox_proc_event;
292 prox_state->callbacks.capture_sample = prox_capture_sample;
293 prox_state->callbacks.pdev = pdev;
294 ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PROX,
295 &prox_state->callbacks);
296 if (ret < 0) {
297 dev_err(&pdev->dev, "callback reg failed\n");
298 goto error_iio_unreg;
299 }
300
301 return ret;
302
303error_iio_unreg:
304 iio_device_unregister(indio_dev);
305error_remove_trigger:
306 hid_sensor_remove_trigger(indio_dev, &prox_state->common_attributes);
307 return ret;
308}
309
310
311static int hid_prox_remove(struct platform_device *pdev)
312{
313 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
314 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
315 struct prox_state *prox_state = iio_priv(indio_dev);
316
317 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PROX);
318 iio_device_unregister(indio_dev);
319 hid_sensor_remove_trigger(indio_dev, &prox_state->common_attributes);
320
321 return 0;
322}
323
324static const struct platform_device_id hid_prox_ids[] = {
325 {
326
327 .name = "HID-SENSOR-200011",
328 },
329 { }
330};
331MODULE_DEVICE_TABLE(platform, hid_prox_ids);
332
333static struct platform_driver hid_prox_platform_driver = {
334 .id_table = hid_prox_ids,
335 .driver = {
336 .name = KBUILD_MODNAME,
337 .pm = &hid_sensor_pm_ops,
338 },
339 .probe = hid_prox_probe,
340 .remove = hid_prox_remove,
341};
342module_platform_driver(hid_prox_platform_driver);
343
344MODULE_DESCRIPTION("HID Sensor Proximity");
345MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>");
346MODULE_LICENSE("GPL");
347MODULE_IMPORT_NS(IIO_HID);
348
