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