1
2
3
4
5
6
7
8
9
10
11
12
13
14
15#include <linux/device.h>
16#include <linux/platform_device.h>
17#include <linux/module.h>
18#include <linux/interrupt.h>
19#include <linux/irq.h>
20#include <linux/slab.h>
21#include <linux/hid-sensor-hub.h>
22#include <linux/iio/iio.h>
23#include <linux/iio/sysfs.h>
24#include <linux/iio/buffer.h>
25#include <linux/iio/trigger_consumer.h>
26#include <linux/iio/triggered_buffer.h>
27#include "../common/hid-sensors/hid-sensor-trigger.h"
28
29struct dev_rot_state {
30 struct hid_sensor_hub_callbacks callbacks;
31 struct hid_sensor_common common_attributes;
32 struct hid_sensor_hub_attribute_info quaternion;
33 u32 sampled_vals[4];
34 int scale_pre_decml;
35 int scale_post_decml;
36 int scale_precision;
37 int value_offset;
38};
39
40
41static const struct iio_chan_spec dev_rot_channels[] = {
42 {
43 .type = IIO_ROT,
44 .modified = 1,
45 .channel2 = IIO_MOD_QUATERNION,
46 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
47 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) |
48 BIT(IIO_CHAN_INFO_OFFSET) |
49 BIT(IIO_CHAN_INFO_SCALE) |
50 BIT(IIO_CHAN_INFO_HYSTERESIS)
51 }
52};
53
54
55static void dev_rot_adjust_channel_bit_mask(struct iio_chan_spec *chan,
56 int size)
57{
58 chan->scan_type.sign = 's';
59
60 chan->scan_type.realbits = size * 8;
61
62 chan->scan_type.storagebits = sizeof(u32) * 8;
63 chan->scan_type.repeat = 4;
64}
65
66
67static int dev_rot_read_raw(struct iio_dev *indio_dev,
68 struct iio_chan_spec const *chan,
69 int size, int *vals, int *val_len,
70 long mask)
71{
72 struct dev_rot_state *rot_state = iio_priv(indio_dev);
73 int ret_type;
74 int i;
75
76 vals[0] = 0;
77 vals[1] = 0;
78
79 switch (mask) {
80 case IIO_CHAN_INFO_RAW:
81 if (size >= 4) {
82 for (i = 0; i < 4; ++i)
83 vals[i] = rot_state->sampled_vals[i];
84 ret_type = IIO_VAL_INT_MULTIPLE;
85 *val_len = 4;
86 } else
87 ret_type = -EINVAL;
88 break;
89 case IIO_CHAN_INFO_SCALE:
90 vals[0] = rot_state->scale_pre_decml;
91 vals[1] = rot_state->scale_post_decml;
92 return rot_state->scale_precision;
93
94 case IIO_CHAN_INFO_OFFSET:
95 *vals = rot_state->value_offset;
96 return IIO_VAL_INT;
97
98 case IIO_CHAN_INFO_SAMP_FREQ:
99 ret_type = hid_sensor_read_samp_freq_value(
100 &rot_state->common_attributes, &vals[0], &vals[1]);
101 break;
102 case IIO_CHAN_INFO_HYSTERESIS:
103 ret_type = hid_sensor_read_raw_hyst_value(
104 &rot_state->common_attributes, &vals[0], &vals[1]);
105 break;
106 default:
107 ret_type = -EINVAL;
108 break;
109 }
110
111 return ret_type;
112}
113
114
115static int dev_rot_write_raw(struct iio_dev *indio_dev,
116 struct iio_chan_spec const *chan,
117 int val,
118 int val2,
119 long mask)
120{
121 struct dev_rot_state *rot_state = iio_priv(indio_dev);
122 int ret;
123
124 switch (mask) {
125 case IIO_CHAN_INFO_SAMP_FREQ:
126 ret = hid_sensor_write_samp_freq_value(
127 &rot_state->common_attributes, val, val2);
128 break;
129 case IIO_CHAN_INFO_HYSTERESIS:
130 ret = hid_sensor_write_raw_hyst_value(
131 &rot_state->common_attributes, val, val2);
132 break;
133 default:
134 ret = -EINVAL;
135 }
136
137 return ret;
138}
139
140static const struct iio_info dev_rot_info = {
141 .read_raw_multi = &dev_rot_read_raw,
142 .write_raw = &dev_rot_write_raw,
143};
144
145
146static void hid_sensor_push_data(struct iio_dev *indio_dev, u8 *data, int len)
147{
148 dev_dbg(&indio_dev->dev, "hid_sensor_push_data >>\n");
149 iio_push_to_buffers(indio_dev, (u8 *)data);
150 dev_dbg(&indio_dev->dev, "hid_sensor_push_data <<\n");
151
152}
153
154
155static int dev_rot_proc_event(struct hid_sensor_hub_device *hsdev,
156 unsigned usage_id,
157 void *priv)
158{
159 struct iio_dev *indio_dev = platform_get_drvdata(priv);
160 struct dev_rot_state *rot_state = iio_priv(indio_dev);
161
162 dev_dbg(&indio_dev->dev, "dev_rot_proc_event\n");
163 if (atomic_read(&rot_state->common_attributes.data_ready))
164 hid_sensor_push_data(indio_dev,
165 (u8 *)rot_state->sampled_vals,
166 sizeof(rot_state->sampled_vals));
167
168 return 0;
169}
170
171
172static int dev_rot_capture_sample(struct hid_sensor_hub_device *hsdev,
173 unsigned usage_id,
174 size_t raw_len, char *raw_data,
175 void *priv)
176{
177 struct iio_dev *indio_dev = platform_get_drvdata(priv);
178 struct dev_rot_state *rot_state = iio_priv(indio_dev);
179
180 if (usage_id == HID_USAGE_SENSOR_ORIENT_QUATERNION) {
181 memcpy(rot_state->sampled_vals, raw_data,
182 sizeof(rot_state->sampled_vals));
183 dev_dbg(&indio_dev->dev, "Recd Quat len:%zu::%zu\n", raw_len,
184 sizeof(rot_state->sampled_vals));
185 }
186
187 return 0;
188}
189
190
191static int dev_rot_parse_report(struct platform_device *pdev,
192 struct hid_sensor_hub_device *hsdev,
193 struct iio_chan_spec *channels,
194 unsigned usage_id,
195 struct dev_rot_state *st)
196{
197 int ret;
198
199 ret = sensor_hub_input_get_attribute_info(hsdev,
200 HID_INPUT_REPORT,
201 usage_id,
202 HID_USAGE_SENSOR_ORIENT_QUATERNION,
203 &st->quaternion);
204 if (ret)
205 return ret;
206
207 dev_rot_adjust_channel_bit_mask(&channels[0],
208 st->quaternion.size / 4);
209
210 dev_dbg(&pdev->dev, "dev_rot %x:%x\n", st->quaternion.index,
211 st->quaternion.report_id);
212
213 dev_dbg(&pdev->dev, "dev_rot: attrib size %d\n",
214 st->quaternion.size);
215
216 st->scale_precision = hid_sensor_format_scale(
217 hsdev->usage,
218 &st->quaternion,
219 &st->scale_pre_decml, &st->scale_post_decml);
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_ORIENTATION,
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
233 return 0;
234}
235
236
237static int hid_dev_rot_probe(struct platform_device *pdev)
238{
239 int ret;
240 char *name;
241 struct iio_dev *indio_dev;
242 struct dev_rot_state *rot_state;
243 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
244
245 indio_dev = devm_iio_device_alloc(&pdev->dev,
246 sizeof(struct dev_rot_state));
247 if (indio_dev == NULL)
248 return -ENOMEM;
249
250 platform_set_drvdata(pdev, indio_dev);
251
252 rot_state = iio_priv(indio_dev);
253 rot_state->common_attributes.hsdev = hsdev;
254 rot_state->common_attributes.pdev = pdev;
255
256 switch (hsdev->usage) {
257 case HID_USAGE_SENSOR_DEVICE_ORIENTATION:
258 name = "dev_rotation";
259 break;
260 case HID_USAGE_SENSOR_RELATIVE_ORIENTATION:
261 name = "relative_orientation";
262 break;
263 case HID_USAGE_SENSOR_GEOMAGNETIC_ORIENTATION:
264 name = "geomagnetic_orientation";
265 break;
266 default:
267 return -EINVAL;
268 }
269
270 ret = hid_sensor_parse_common_attributes(hsdev, hsdev->usage,
271 &rot_state->common_attributes);
272 if (ret) {
273 dev_err(&pdev->dev, "failed to setup common attributes\n");
274 return ret;
275 }
276
277 indio_dev->channels = devm_kmemdup(&pdev->dev, dev_rot_channels,
278 sizeof(dev_rot_channels),
279 GFP_KERNEL);
280 if (!indio_dev->channels) {
281 dev_err(&pdev->dev, "failed to duplicate channels\n");
282 return -ENOMEM;
283 }
284
285 ret = dev_rot_parse_report(pdev, hsdev,
286 (struct iio_chan_spec *)indio_dev->channels,
287 hsdev->usage, rot_state);
288 if (ret) {
289 dev_err(&pdev->dev, "failed to setup attributes\n");
290 return ret;
291 }
292
293 indio_dev->num_channels = ARRAY_SIZE(dev_rot_channels);
294 indio_dev->dev.parent = &pdev->dev;
295 indio_dev->info = &dev_rot_info;
296 indio_dev->name = name;
297 indio_dev->modes = INDIO_DIRECT_MODE;
298
299 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
300 NULL, NULL);
301 if (ret) {
302 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
303 return ret;
304 }
305 atomic_set(&rot_state->common_attributes.data_ready, 0);
306 ret = hid_sensor_setup_trigger(indio_dev, name,
307 &rot_state->common_attributes);
308 if (ret) {
309 dev_err(&pdev->dev, "trigger setup failed\n");
310 goto error_unreg_buffer_funcs;
311 }
312
313 ret = iio_device_register(indio_dev);
314 if (ret) {
315 dev_err(&pdev->dev, "device register failed\n");
316 goto error_remove_trigger;
317 }
318
319 rot_state->callbacks.send_event = dev_rot_proc_event;
320 rot_state->callbacks.capture_sample = dev_rot_capture_sample;
321 rot_state->callbacks.pdev = pdev;
322 ret = sensor_hub_register_callback(hsdev, hsdev->usage,
323 &rot_state->callbacks);
324 if (ret) {
325 dev_err(&pdev->dev, "callback reg failed\n");
326 goto error_iio_unreg;
327 }
328
329 return 0;
330
331error_iio_unreg:
332 iio_device_unregister(indio_dev);
333error_remove_trigger:
334 hid_sensor_remove_trigger(&rot_state->common_attributes);
335error_unreg_buffer_funcs:
336 iio_triggered_buffer_cleanup(indio_dev);
337 return ret;
338}
339
340
341static int hid_dev_rot_remove(struct platform_device *pdev)
342{
343 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
344 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
345 struct dev_rot_state *rot_state = iio_priv(indio_dev);
346
347 sensor_hub_remove_callback(hsdev, hsdev->usage);
348 iio_device_unregister(indio_dev);
349 hid_sensor_remove_trigger(&rot_state->common_attributes);
350 iio_triggered_buffer_cleanup(indio_dev);
351
352 return 0;
353}
354
355static const struct platform_device_id hid_dev_rot_ids[] = {
356 {
357
358 .name = "HID-SENSOR-20008a",
359 },
360 {
361
362 .name = "HID-SENSOR-20008e",
363 },
364 {
365
366 .name = "HID-SENSOR-2000c1",
367 },
368 { }
369};
370MODULE_DEVICE_TABLE(platform, hid_dev_rot_ids);
371
372static struct platform_driver hid_dev_rot_platform_driver = {
373 .id_table = hid_dev_rot_ids,
374 .driver = {
375 .name = KBUILD_MODNAME,
376 .pm = &hid_sensor_pm_ops,
377 },
378 .probe = hid_dev_rot_probe,
379 .remove = hid_dev_rot_remove,
380};
381module_platform_driver(hid_dev_rot_platform_driver);
382
383MODULE_DESCRIPTION("HID Sensor Device Rotation");
384MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
385MODULE_LICENSE("GPL");
386
