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18#include <linux/device.h>
19#include <linux/platform_device.h>
20#include <linux/module.h>
21#include <linux/interrupt.h>
22#include <linux/irq.h>
23#include <linux/slab.h>
24#include <linux/delay.h>
25#include <linux/hid-sensor-hub.h>
26#include <linux/iio/iio.h>
27#include <linux/iio/sysfs.h>
28#include <linux/iio/buffer.h>
29#include <linux/iio/trigger_consumer.h>
30#include <linux/iio/triggered_buffer.h>
31#include "../common/hid-sensors/hid-sensor-trigger.h"
32
33#define CHANNEL_SCAN_INDEX_PRESENCE 0
34
35struct prox_state {
36 struct hid_sensor_hub_callbacks callbacks;
37 struct hid_sensor_common common_attributes;
38 struct hid_sensor_hub_attribute_info prox_attr;
39 u32 human_presence;
40};
41
42
43static const struct iio_chan_spec prox_channels[] = {
44 {
45 .type = IIO_PROXIMITY,
46 .modified = 1,
47 .channel2 = IIO_NO_MOD,
48 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
49 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
50 BIT(IIO_CHAN_INFO_SCALE) |
51 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
52 BIT(IIO_CHAN_INFO_HYSTERESIS),
53 .scan_index = CHANNEL_SCAN_INDEX_PRESENCE,
54 }
55};
56
57
58static void prox_adjust_channel_bit_mask(struct iio_chan_spec *channels,
59 int channel, int size)
60{
61 channels[channel].scan_type.sign = 's';
62
63 channels[channel].scan_type.realbits = size * 8;
64
65 channels[channel].scan_type.storagebits = sizeof(u32) * 8;
66}
67
68
69static int prox_read_raw(struct iio_dev *indio_dev,
70 struct iio_chan_spec const *chan,
71 int *val, int *val2,
72 long mask)
73{
74 struct prox_state *prox_state = iio_priv(indio_dev);
75 int report_id = -1;
76 u32 address;
77 int ret_type;
78 s32 poll_value;
79
80 *val = 0;
81 *val2 = 0;
82 switch (mask) {
83 case IIO_CHAN_INFO_RAW:
84 switch (chan->scan_index) {
85 case CHANNEL_SCAN_INDEX_PRESENCE:
86 report_id = prox_state->prox_attr.report_id;
87 address =
88 HID_USAGE_SENSOR_HUMAN_PRESENCE;
89 break;
90 default:
91 report_id = -1;
92 break;
93 }
94 if (report_id >= 0) {
95 poll_value = hid_sensor_read_poll_value(
96 &prox_state->common_attributes);
97 if (poll_value < 0)
98 return -EINVAL;
99
100 hid_sensor_power_state(&prox_state->common_attributes,
101 true);
102
103 msleep_interruptible(poll_value * 2);
104
105 *val = sensor_hub_input_attr_get_raw_value(
106 prox_state->common_attributes.hsdev,
107 HID_USAGE_SENSOR_PROX, address,
108 report_id);
109 hid_sensor_power_state(&prox_state->common_attributes,
110 false);
111 } else {
112 *val = 0;
113 return -EINVAL;
114 }
115 ret_type = IIO_VAL_INT;
116 break;
117 case IIO_CHAN_INFO_SCALE:
118 *val = prox_state->prox_attr.units;
119 ret_type = IIO_VAL_INT;
120 break;
121 case IIO_CHAN_INFO_OFFSET:
122 *val = hid_sensor_convert_exponent(
123 prox_state->prox_attr.unit_expo);
124 ret_type = IIO_VAL_INT;
125 break;
126 case IIO_CHAN_INFO_SAMP_FREQ:
127 ret_type = hid_sensor_read_samp_freq_value(
128 &prox_state->common_attributes, val, val2);
129 break;
130 case IIO_CHAN_INFO_HYSTERESIS:
131 ret_type = hid_sensor_read_raw_hyst_value(
132 &prox_state->common_attributes, val, val2);
133 break;
134 default:
135 ret_type = -EINVAL;
136 break;
137 }
138
139 return ret_type;
140}
141
142
143static int prox_write_raw(struct iio_dev *indio_dev,
144 struct iio_chan_spec const *chan,
145 int val,
146 int val2,
147 long mask)
148{
149 struct prox_state *prox_state = iio_priv(indio_dev);
150 int ret = 0;
151
152 switch (mask) {
153 case IIO_CHAN_INFO_SAMP_FREQ:
154 ret = hid_sensor_write_samp_freq_value(
155 &prox_state->common_attributes, val, val2);
156 break;
157 case IIO_CHAN_INFO_HYSTERESIS:
158 ret = hid_sensor_write_raw_hyst_value(
159 &prox_state->common_attributes, val, val2);
160 break;
161 default:
162 ret = -EINVAL;
163 }
164
165 return ret;
166}
167
168static const struct iio_info prox_info = {
169 .driver_module = THIS_MODULE,
170 .read_raw = &prox_read_raw,
171 .write_raw = &prox_write_raw,
172};
173
174
175static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
176 int len)
177{
178 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
179 iio_push_to_buffers(indio_dev, data);
180}
181
182
183static int prox_proc_event(struct hid_sensor_hub_device *hsdev,
184 unsigned usage_id,
185 void *priv)
186{
187 struct iio_dev *indio_dev = platform_get_drvdata(priv);
188 struct prox_state *prox_state = iio_priv(indio_dev);
189
190 dev_dbg(&indio_dev->dev, "prox_proc_event\n");
191 if (atomic_read(&prox_state->common_attributes.data_ready))
192 hid_sensor_push_data(indio_dev,
193 &prox_state->human_presence,
194 sizeof(prox_state->human_presence));
195
196 return 0;
197}
198
199
200static int prox_capture_sample(struct hid_sensor_hub_device *hsdev,
201 unsigned usage_id,
202 size_t raw_len, char *raw_data,
203 void *priv)
204{
205 struct iio_dev *indio_dev = platform_get_drvdata(priv);
206 struct prox_state *prox_state = iio_priv(indio_dev);
207 int ret = -EINVAL;
208
209 switch (usage_id) {
210 case HID_USAGE_SENSOR_HUMAN_PRESENCE:
211 prox_state->human_presence = *(u32 *)raw_data;
212 ret = 0;
213 break;
214 default:
215 break;
216 }
217
218 return ret;
219}
220
221
222static int prox_parse_report(struct platform_device *pdev,
223 struct hid_sensor_hub_device *hsdev,
224 struct iio_chan_spec *channels,
225 unsigned usage_id,
226 struct prox_state *st)
227{
228 int ret;
229
230 ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
231 usage_id,
232 HID_USAGE_SENSOR_HUMAN_PRESENCE,
233 &st->prox_attr);
234 if (ret < 0)
235 return ret;
236 prox_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESENCE,
237 st->prox_attr.size);
238
239 dev_dbg(&pdev->dev, "prox %x:%x\n", st->prox_attr.index,
240 st->prox_attr.report_id);
241
242
243 if (st->common_attributes.sensitivity.index < 0) {
244 sensor_hub_input_get_attribute_info(hsdev,
245 HID_FEATURE_REPORT, usage_id,
246 HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
247 HID_USAGE_SENSOR_DATA_PRESENCE,
248 &st->common_attributes.sensitivity);
249 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
250 st->common_attributes.sensitivity.index,
251 st->common_attributes.sensitivity.report_id);
252 }
253 return ret;
254}
255
256
257static int hid_prox_probe(struct platform_device *pdev)
258{
259 int ret = 0;
260 static const char *name = "prox";
261 struct iio_dev *indio_dev;
262 struct prox_state *prox_state;
263 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
264 struct iio_chan_spec *channels;
265
266 indio_dev = devm_iio_device_alloc(&pdev->dev,
267 sizeof(struct prox_state));
268 if (!indio_dev)
269 return -ENOMEM;
270 platform_set_drvdata(pdev, indio_dev);
271
272 prox_state = iio_priv(indio_dev);
273 prox_state->common_attributes.hsdev = hsdev;
274 prox_state->common_attributes.pdev = pdev;
275
276 ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_PROX,
277 &prox_state->common_attributes);
278 if (ret) {
279 dev_err(&pdev->dev, "failed to setup common attributes\n");
280 return ret;
281 }
282
283 channels = kmemdup(prox_channels, sizeof(prox_channels), GFP_KERNEL);
284 if (!channels) {
285 dev_err(&pdev->dev, "failed to duplicate channels\n");
286 return -ENOMEM;
287 }
288
289 ret = prox_parse_report(pdev, hsdev, channels,
290 HID_USAGE_SENSOR_PROX, prox_state);
291 if (ret) {
292 dev_err(&pdev->dev, "failed to setup attributes\n");
293 goto error_free_dev_mem;
294 }
295
296 indio_dev->channels = channels;
297 indio_dev->num_channels =
298 ARRAY_SIZE(prox_channels);
299 indio_dev->dev.parent = &pdev->dev;
300 indio_dev->info = &prox_info;
301 indio_dev->name = name;
302 indio_dev->modes = INDIO_DIRECT_MODE;
303
304 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
305 NULL, NULL);
306 if (ret) {
307 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
308 goto error_free_dev_mem;
309 }
310 atomic_set(&prox_state->common_attributes.data_ready, 0);
311 ret = hid_sensor_setup_trigger(indio_dev, name,
312 &prox_state->common_attributes);
313 if (ret) {
314 dev_err(&pdev->dev, "trigger setup failed\n");
315 goto error_unreg_buffer_funcs;
316 }
317
318 ret = iio_device_register(indio_dev);
319 if (ret) {
320 dev_err(&pdev->dev, "device register failed\n");
321 goto error_remove_trigger;
322 }
323
324 prox_state->callbacks.send_event = prox_proc_event;
325 prox_state->callbacks.capture_sample = prox_capture_sample;
326 prox_state->callbacks.pdev = pdev;
327 ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PROX,
328 &prox_state->callbacks);
329 if (ret < 0) {
330 dev_err(&pdev->dev, "callback reg failed\n");
331 goto error_iio_unreg;
332 }
333
334 return ret;
335
336error_iio_unreg:
337 iio_device_unregister(indio_dev);
338error_remove_trigger:
339 hid_sensor_remove_trigger(&prox_state->common_attributes);
340error_unreg_buffer_funcs:
341 iio_triggered_buffer_cleanup(indio_dev);
342error_free_dev_mem:
343 kfree(indio_dev->channels);
344 return ret;
345}
346
347
348static int hid_prox_remove(struct platform_device *pdev)
349{
350 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
351 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
352 struct prox_state *prox_state = iio_priv(indio_dev);
353
354 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PROX);
355 iio_device_unregister(indio_dev);
356 hid_sensor_remove_trigger(&prox_state->common_attributes);
357 iio_triggered_buffer_cleanup(indio_dev);
358 kfree(indio_dev->channels);
359
360 return 0;
361}
362
363static struct platform_device_id hid_prox_ids[] = {
364 {
365
366 .name = "HID-SENSOR-200011",
367 },
368 { }
369};
370MODULE_DEVICE_TABLE(platform, hid_prox_ids);
371
372static struct platform_driver hid_prox_platform_driver = {
373 .id_table = hid_prox_ids,
374 .driver = {
375 .name = KBUILD_MODNAME,
376 },
377 .probe = hid_prox_probe,
378 .remove = hid_prox_remove,
379};
380module_platform_driver(hid_prox_platform_driver);
381
382MODULE_DESCRIPTION("HID Sensor Proximity");
383MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>");
384MODULE_LICENSE("GPL");
385
