This source file includes following definitions.
- prox_adjust_channel_bit_mask
- prox_read_raw
- prox_write_raw
- hid_sensor_push_data
- prox_proc_event
- prox_capture_sample
- prox_parse_report
- hid_prox_probe
- hid_prox_remove
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5
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"
20
21 #define CHANNEL_SCAN_INDEX_PRESENCE 0
22
23 struct prox_state {
24 struct hid_sensor_hub_callbacks callbacks;
25 struct hid_sensor_common common_attributes;
26 struct hid_sensor_hub_attribute_info prox_attr;
27 u32 human_presence;
28 };
29
30
31 static const struct iio_chan_spec prox_channels[] = {
32 {
33 .type = IIO_PROXIMITY,
34 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
35 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
36 BIT(IIO_CHAN_INFO_SCALE) |
37 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
38 BIT(IIO_CHAN_INFO_HYSTERESIS),
39 .scan_index = CHANNEL_SCAN_INDEX_PRESENCE,
40 }
41 };
42
43
44 static void prox_adjust_channel_bit_mask(struct iio_chan_spec *channels,
45 int channel, int size)
46 {
47 channels[channel].scan_type.sign = 's';
48
49 channels[channel].scan_type.realbits = size * 8;
50
51 channels[channel].scan_type.storagebits = sizeof(u32) * 8;
52 }
53
54
55 static int prox_read_raw(struct iio_dev *indio_dev,
56 struct iio_chan_spec const *chan,
57 int *val, int *val2,
58 long mask)
59 {
60 struct prox_state *prox_state = iio_priv(indio_dev);
61 int report_id = -1;
62 u32 address;
63 int ret_type;
64 s32 min;
65
66 *val = 0;
67 *val2 = 0;
68 switch (mask) {
69 case IIO_CHAN_INFO_RAW:
70 switch (chan->scan_index) {
71 case CHANNEL_SCAN_INDEX_PRESENCE:
72 report_id = prox_state->prox_attr.report_id;
73 min = prox_state->prox_attr.logical_minimum;
74 address = HID_USAGE_SENSOR_HUMAN_PRESENCE;
75 break;
76 default:
77 report_id = -1;
78 break;
79 }
80 if (report_id >= 0) {
81 hid_sensor_power_state(&prox_state->common_attributes,
82 true);
83 *val = sensor_hub_input_attr_get_raw_value(
84 prox_state->common_attributes.hsdev,
85 HID_USAGE_SENSOR_PROX, address,
86 report_id,
87 SENSOR_HUB_SYNC,
88 min < 0);
89 hid_sensor_power_state(&prox_state->common_attributes,
90 false);
91 } else {
92 *val = 0;
93 return -EINVAL;
94 }
95 ret_type = IIO_VAL_INT;
96 break;
97 case IIO_CHAN_INFO_SCALE:
98 *val = prox_state->prox_attr.units;
99 ret_type = IIO_VAL_INT;
100 break;
101 case IIO_CHAN_INFO_OFFSET:
102 *val = hid_sensor_convert_exponent(
103 prox_state->prox_attr.unit_expo);
104 ret_type = IIO_VAL_INT;
105 break;
106 case IIO_CHAN_INFO_SAMP_FREQ:
107 ret_type = hid_sensor_read_samp_freq_value(
108 &prox_state->common_attributes, val, val2);
109 break;
110 case IIO_CHAN_INFO_HYSTERESIS:
111 ret_type = hid_sensor_read_raw_hyst_value(
112 &prox_state->common_attributes, val, val2);
113 break;
114 default:
115 ret_type = -EINVAL;
116 break;
117 }
118
119 return ret_type;
120 }
121
122
123 static int prox_write_raw(struct iio_dev *indio_dev,
124 struct iio_chan_spec const *chan,
125 int val,
126 int val2,
127 long mask)
128 {
129 struct prox_state *prox_state = iio_priv(indio_dev);
130 int ret = 0;
131
132 switch (mask) {
133 case IIO_CHAN_INFO_SAMP_FREQ:
134 ret = hid_sensor_write_samp_freq_value(
135 &prox_state->common_attributes, val, val2);
136 break;
137 case IIO_CHAN_INFO_HYSTERESIS:
138 ret = hid_sensor_write_raw_hyst_value(
139 &prox_state->common_attributes, val, val2);
140 break;
141 default:
142 ret = -EINVAL;
143 }
144
145 return ret;
146 }
147
148 static const struct iio_info prox_info = {
149 .read_raw = &prox_read_raw,
150 .write_raw = &prox_write_raw,
151 };
152
153
154 static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
155 int len)
156 {
157 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
158 iio_push_to_buffers(indio_dev, data);
159 }
160
161
162 static int prox_proc_event(struct hid_sensor_hub_device *hsdev,
163 unsigned usage_id,
164 void *priv)
165 {
166 struct iio_dev *indio_dev = platform_get_drvdata(priv);
167 struct prox_state *prox_state = iio_priv(indio_dev);
168
169 dev_dbg(&indio_dev->dev, "prox_proc_event\n");
170 if (atomic_read(&prox_state->common_attributes.data_ready))
171 hid_sensor_push_data(indio_dev,
172 &prox_state->human_presence,
173 sizeof(prox_state->human_presence));
174
175 return 0;
176 }
177
178
179 static int prox_capture_sample(struct hid_sensor_hub_device *hsdev,
180 unsigned usage_id,
181 size_t raw_len, char *raw_data,
182 void *priv)
183 {
184 struct iio_dev *indio_dev = platform_get_drvdata(priv);
185 struct prox_state *prox_state = iio_priv(indio_dev);
186 int ret = -EINVAL;
187
188 switch (usage_id) {
189 case HID_USAGE_SENSOR_HUMAN_PRESENCE:
190 prox_state->human_presence = *(u32 *)raw_data;
191 ret = 0;
192 break;
193 default:
194 break;
195 }
196
197 return ret;
198 }
199
200
201 static int prox_parse_report(struct platform_device *pdev,
202 struct hid_sensor_hub_device *hsdev,
203 struct iio_chan_spec *channels,
204 unsigned usage_id,
205 struct prox_state *st)
206 {
207 int ret;
208
209 ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
210 usage_id,
211 HID_USAGE_SENSOR_HUMAN_PRESENCE,
212 &st->prox_attr);
213 if (ret < 0)
214 return ret;
215 prox_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESENCE,
216 st->prox_attr.size);
217
218 dev_dbg(&pdev->dev, "prox %x:%x\n", st->prox_attr.index,
219 st->prox_attr.report_id);
220
221
222 if (st->common_attributes.sensitivity.index < 0) {
223 sensor_hub_input_get_attribute_info(hsdev,
224 HID_FEATURE_REPORT, usage_id,
225 HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
226 HID_USAGE_SENSOR_DATA_PRESENCE,
227 &st->common_attributes.sensitivity);
228 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
229 st->common_attributes.sensitivity.index,
230 st->common_attributes.sensitivity.report_id);
231 }
232 if (st->common_attributes.sensitivity.index < 0)
233 sensor_hub_input_get_attribute_info(hsdev,
234 HID_FEATURE_REPORT, usage_id,
235 HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
236 HID_USAGE_SENSOR_HUMAN_PRESENCE,
237 &st->common_attributes.sensitivity);
238
239 return ret;
240 }
241
242
243 static int hid_prox_probe(struct platform_device *pdev)
244 {
245 int ret = 0;
246 static const char *name = "prox";
247 struct iio_dev *indio_dev;
248 struct prox_state *prox_state;
249 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
250
251 indio_dev = devm_iio_device_alloc(&pdev->dev,
252 sizeof(struct prox_state));
253 if (!indio_dev)
254 return -ENOMEM;
255 platform_set_drvdata(pdev, indio_dev);
256
257 prox_state = iio_priv(indio_dev);
258 prox_state->common_attributes.hsdev = hsdev;
259 prox_state->common_attributes.pdev = pdev;
260
261 ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_PROX,
262 &prox_state->common_attributes);
263 if (ret) {
264 dev_err(&pdev->dev, "failed to setup common attributes\n");
265 return ret;
266 }
267
268 indio_dev->channels = kmemdup(prox_channels, sizeof(prox_channels),
269 GFP_KERNEL);
270 if (!indio_dev->channels) {
271 dev_err(&pdev->dev, "failed to duplicate channels\n");
272 return -ENOMEM;
273 }
274
275 ret = prox_parse_report(pdev, hsdev,
276 (struct iio_chan_spec *)indio_dev->channels,
277 HID_USAGE_SENSOR_PROX, prox_state);
278 if (ret) {
279 dev_err(&pdev->dev, "failed to setup attributes\n");
280 goto error_free_dev_mem;
281 }
282
283 indio_dev->num_channels = ARRAY_SIZE(prox_channels);
284 indio_dev->dev.parent = &pdev->dev;
285 indio_dev->info = &prox_info;
286 indio_dev->name = name;
287 indio_dev->modes = INDIO_DIRECT_MODE;
288
289 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
290 NULL, NULL);
291 if (ret) {
292 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
293 goto error_free_dev_mem;
294 }
295 atomic_set(&prox_state->common_attributes.data_ready, 0);
296 ret = hid_sensor_setup_trigger(indio_dev, name,
297 &prox_state->common_attributes);
298 if (ret) {
299 dev_err(&pdev->dev, "trigger setup failed\n");
300 goto error_unreg_buffer_funcs;
301 }
302
303 ret = iio_device_register(indio_dev);
304 if (ret) {
305 dev_err(&pdev->dev, "device register failed\n");
306 goto error_remove_trigger;
307 }
308
309 prox_state->callbacks.send_event = prox_proc_event;
310 prox_state->callbacks.capture_sample = prox_capture_sample;
311 prox_state->callbacks.pdev = pdev;
312 ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PROX,
313 &prox_state->callbacks);
314 if (ret < 0) {
315 dev_err(&pdev->dev, "callback reg failed\n");
316 goto error_iio_unreg;
317 }
318
319 return ret;
320
321 error_iio_unreg:
322 iio_device_unregister(indio_dev);
323 error_remove_trigger:
324 hid_sensor_remove_trigger(&prox_state->common_attributes);
325 error_unreg_buffer_funcs:
326 iio_triggered_buffer_cleanup(indio_dev);
327 error_free_dev_mem:
328 kfree(indio_dev->channels);
329 return ret;
330 }
331
332
333 static int hid_prox_remove(struct platform_device *pdev)
334 {
335 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
336 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
337 struct prox_state *prox_state = iio_priv(indio_dev);
338
339 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PROX);
340 iio_device_unregister(indio_dev);
341 hid_sensor_remove_trigger(&prox_state->common_attributes);
342 iio_triggered_buffer_cleanup(indio_dev);
343 kfree(indio_dev->channels);
344
345 return 0;
346 }
347
348 static const struct platform_device_id hid_prox_ids[] = {
349 {
350
351 .name = "HID-SENSOR-200011",
352 },
353 { }
354 };
355 MODULE_DEVICE_TABLE(platform, hid_prox_ids);
356
357 static struct platform_driver hid_prox_platform_driver = {
358 .id_table = hid_prox_ids,
359 .driver = {
360 .name = KBUILD_MODNAME,
361 .pm = &hid_sensor_pm_ops,
362 },
363 .probe = hid_prox_probe,
364 .remove = hid_prox_remove,
365 };
366 module_platform_driver(hid_prox_platform_driver);
367
368 MODULE_DESCRIPTION("HID Sensor Proximity");
369 MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>");
370 MODULE_LICENSE("GPL");