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