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7#include <linux/device.h>
8#include <linux/platform_device.h>
9#include <linux/module.h>
10#include <linux/interrupt.h>
11#include <linux/irq.h>
12#include <linux/slab.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
21struct dev_rot_state {
22 struct hid_sensor_hub_callbacks callbacks;
23 struct hid_sensor_common common_attributes;
24 struct hid_sensor_hub_attribute_info quaternion;
25 u32 sampled_vals[4];
26 int scale_pre_decml;
27 int scale_post_decml;
28 int scale_precision;
29 int value_offset;
30};
31
32
33static const struct iio_chan_spec dev_rot_channels[] = {
34 {
35 .type = IIO_ROT,
36 .modified = 1,
37 .channel2 = IIO_MOD_QUATERNION,
38 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
39 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) |
40 BIT(IIO_CHAN_INFO_OFFSET) |
41 BIT(IIO_CHAN_INFO_SCALE) |
42 BIT(IIO_CHAN_INFO_HYSTERESIS)
43 }
44};
45
46
47static void dev_rot_adjust_channel_bit_mask(struct iio_chan_spec *chan,
48 int size)
49{
50 chan->scan_type.sign = 's';
51
52 chan->scan_type.realbits = size * 8;
53
54 chan->scan_type.storagebits = sizeof(u32) * 8;
55 chan->scan_type.repeat = 4;
56}
57
58
59static int dev_rot_read_raw(struct iio_dev *indio_dev,
60 struct iio_chan_spec const *chan,
61 int size, int *vals, int *val_len,
62 long mask)
63{
64 struct dev_rot_state *rot_state = iio_priv(indio_dev);
65 int ret_type;
66 int i;
67
68 vals[0] = 0;
69 vals[1] = 0;
70
71 switch (mask) {
72 case IIO_CHAN_INFO_RAW:
73 if (size >= 4) {
74 for (i = 0; i < 4; ++i)
75 vals[i] = rot_state->sampled_vals[i];
76 ret_type = IIO_VAL_INT_MULTIPLE;
77 *val_len = 4;
78 } else
79 ret_type = -EINVAL;
80 break;
81 case IIO_CHAN_INFO_SCALE:
82 vals[0] = rot_state->scale_pre_decml;
83 vals[1] = rot_state->scale_post_decml;
84 return rot_state->scale_precision;
85
86 case IIO_CHAN_INFO_OFFSET:
87 *vals = rot_state->value_offset;
88 return IIO_VAL_INT;
89
90 case IIO_CHAN_INFO_SAMP_FREQ:
91 ret_type = hid_sensor_read_samp_freq_value(
92 &rot_state->common_attributes, &vals[0], &vals[1]);
93 break;
94 case IIO_CHAN_INFO_HYSTERESIS:
95 ret_type = hid_sensor_read_raw_hyst_value(
96 &rot_state->common_attributes, &vals[0], &vals[1]);
97 break;
98 default:
99 ret_type = -EINVAL;
100 break;
101 }
102
103 return ret_type;
104}
105
106
107static int dev_rot_write_raw(struct iio_dev *indio_dev,
108 struct iio_chan_spec const *chan,
109 int val,
110 int val2,
111 long mask)
112{
113 struct dev_rot_state *rot_state = iio_priv(indio_dev);
114 int ret;
115
116 switch (mask) {
117 case IIO_CHAN_INFO_SAMP_FREQ:
118 ret = hid_sensor_write_samp_freq_value(
119 &rot_state->common_attributes, val, val2);
120 break;
121 case IIO_CHAN_INFO_HYSTERESIS:
122 ret = hid_sensor_write_raw_hyst_value(
123 &rot_state->common_attributes, val, val2);
124 break;
125 default:
126 ret = -EINVAL;
127 }
128
129 return ret;
130}
131
132static const struct iio_info dev_rot_info = {
133 .read_raw_multi = &dev_rot_read_raw,
134 .write_raw = &dev_rot_write_raw,
135};
136
137
138static void hid_sensor_push_data(struct iio_dev *indio_dev, u8 *data, int len)
139{
140 dev_dbg(&indio_dev->dev, "hid_sensor_push_data >>\n");
141 iio_push_to_buffers(indio_dev, (u8 *)data);
142 dev_dbg(&indio_dev->dev, "hid_sensor_push_data <<\n");
143
144}
145
146
147static int dev_rot_proc_event(struct hid_sensor_hub_device *hsdev,
148 unsigned usage_id,
149 void *priv)
150{
151 struct iio_dev *indio_dev = platform_get_drvdata(priv);
152 struct dev_rot_state *rot_state = iio_priv(indio_dev);
153
154 dev_dbg(&indio_dev->dev, "dev_rot_proc_event\n");
155 if (atomic_read(&rot_state->common_attributes.data_ready))
156 hid_sensor_push_data(indio_dev,
157 (u8 *)rot_state->sampled_vals,
158 sizeof(rot_state->sampled_vals));
159
160 return 0;
161}
162
163
164static int dev_rot_capture_sample(struct hid_sensor_hub_device *hsdev,
165 unsigned usage_id,
166 size_t raw_len, char *raw_data,
167 void *priv)
168{
169 struct iio_dev *indio_dev = platform_get_drvdata(priv);
170 struct dev_rot_state *rot_state = iio_priv(indio_dev);
171
172 if (usage_id == HID_USAGE_SENSOR_ORIENT_QUATERNION) {
173 memcpy(rot_state->sampled_vals, raw_data,
174 sizeof(rot_state->sampled_vals));
175 dev_dbg(&indio_dev->dev, "Recd Quat len:%zu::%zu\n", raw_len,
176 sizeof(rot_state->sampled_vals));
177 }
178
179 return 0;
180}
181
182
183static int dev_rot_parse_report(struct platform_device *pdev,
184 struct hid_sensor_hub_device *hsdev,
185 struct iio_chan_spec *channels,
186 unsigned usage_id,
187 struct dev_rot_state *st)
188{
189 int ret;
190
191 ret = sensor_hub_input_get_attribute_info(hsdev,
192 HID_INPUT_REPORT,
193 usage_id,
194 HID_USAGE_SENSOR_ORIENT_QUATERNION,
195 &st->quaternion);
196 if (ret)
197 return ret;
198
199 dev_rot_adjust_channel_bit_mask(&channels[0],
200 st->quaternion.size / 4);
201
202 dev_dbg(&pdev->dev, "dev_rot %x:%x\n", st->quaternion.index,
203 st->quaternion.report_id);
204
205 dev_dbg(&pdev->dev, "dev_rot: attrib size %d\n",
206 st->quaternion.size);
207
208 st->scale_precision = hid_sensor_format_scale(
209 hsdev->usage,
210 &st->quaternion,
211 &st->scale_pre_decml, &st->scale_post_decml);
212
213
214 if (st->common_attributes.sensitivity.index < 0) {
215 sensor_hub_input_get_attribute_info(hsdev,
216 HID_FEATURE_REPORT, usage_id,
217 HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
218 HID_USAGE_SENSOR_DATA_ORIENTATION,
219 &st->common_attributes.sensitivity);
220 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
221 st->common_attributes.sensitivity.index,
222 st->common_attributes.sensitivity.report_id);
223 }
224
225 return 0;
226}
227
228
229static int hid_dev_rot_probe(struct platform_device *pdev)
230{
231 int ret;
232 char *name;
233 struct iio_dev *indio_dev;
234 struct dev_rot_state *rot_state;
235 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
236
237 indio_dev = devm_iio_device_alloc(&pdev->dev,
238 sizeof(struct dev_rot_state));
239 if (indio_dev == NULL)
240 return -ENOMEM;
241
242 platform_set_drvdata(pdev, indio_dev);
243
244 rot_state = iio_priv(indio_dev);
245 rot_state->common_attributes.hsdev = hsdev;
246 rot_state->common_attributes.pdev = pdev;
247
248 switch (hsdev->usage) {
249 case HID_USAGE_SENSOR_DEVICE_ORIENTATION:
250 name = "dev_rotation";
251 break;
252 case HID_USAGE_SENSOR_RELATIVE_ORIENTATION:
253 name = "relative_orientation";
254 break;
255 case HID_USAGE_SENSOR_GEOMAGNETIC_ORIENTATION:
256 name = "geomagnetic_orientation";
257 break;
258 default:
259 return -EINVAL;
260 }
261
262 ret = hid_sensor_parse_common_attributes(hsdev, hsdev->usage,
263 &rot_state->common_attributes);
264 if (ret) {
265 dev_err(&pdev->dev, "failed to setup common attributes\n");
266 return ret;
267 }
268
269 indio_dev->channels = devm_kmemdup(&pdev->dev, dev_rot_channels,
270 sizeof(dev_rot_channels),
271 GFP_KERNEL);
272 if (!indio_dev->channels) {
273 dev_err(&pdev->dev, "failed to duplicate channels\n");
274 return -ENOMEM;
275 }
276
277 ret = dev_rot_parse_report(pdev, hsdev,
278 (struct iio_chan_spec *)indio_dev->channels,
279 hsdev->usage, rot_state);
280 if (ret) {
281 dev_err(&pdev->dev, "failed to setup attributes\n");
282 return ret;
283 }
284
285 indio_dev->num_channels = ARRAY_SIZE(dev_rot_channels);
286 indio_dev->dev.parent = &pdev->dev;
287 indio_dev->info = &dev_rot_info;
288 indio_dev->name = name;
289 indio_dev->modes = INDIO_DIRECT_MODE;
290
291 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
292 NULL, NULL);
293 if (ret) {
294 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
295 return ret;
296 }
297 atomic_set(&rot_state->common_attributes.data_ready, 0);
298 ret = hid_sensor_setup_trigger(indio_dev, name,
299 &rot_state->common_attributes);
300 if (ret) {
301 dev_err(&pdev->dev, "trigger setup failed\n");
302 goto error_unreg_buffer_funcs;
303 }
304
305 ret = iio_device_register(indio_dev);
306 if (ret) {
307 dev_err(&pdev->dev, "device register failed\n");
308 goto error_remove_trigger;
309 }
310
311 rot_state->callbacks.send_event = dev_rot_proc_event;
312 rot_state->callbacks.capture_sample = dev_rot_capture_sample;
313 rot_state->callbacks.pdev = pdev;
314 ret = sensor_hub_register_callback(hsdev, hsdev->usage,
315 &rot_state->callbacks);
316 if (ret) {
317 dev_err(&pdev->dev, "callback reg failed\n");
318 goto error_iio_unreg;
319 }
320
321 return 0;
322
323error_iio_unreg:
324 iio_device_unregister(indio_dev);
325error_remove_trigger:
326 hid_sensor_remove_trigger(&rot_state->common_attributes);
327error_unreg_buffer_funcs:
328 iio_triggered_buffer_cleanup(indio_dev);
329 return ret;
330}
331
332
333static int hid_dev_rot_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 dev_rot_state *rot_state = iio_priv(indio_dev);
338
339 sensor_hub_remove_callback(hsdev, hsdev->usage);
340 iio_device_unregister(indio_dev);
341 hid_sensor_remove_trigger(&rot_state->common_attributes);
342 iio_triggered_buffer_cleanup(indio_dev);
343
344 return 0;
345}
346
347static const struct platform_device_id hid_dev_rot_ids[] = {
348 {
349
350 .name = "HID-SENSOR-20008a",
351 },
352 {
353
354 .name = "HID-SENSOR-20008e",
355 },
356 {
357
358 .name = "HID-SENSOR-2000c1",
359 },
360 { }
361};
362MODULE_DEVICE_TABLE(platform, hid_dev_rot_ids);
363
364static struct platform_driver hid_dev_rot_platform_driver = {
365 .id_table = hid_dev_rot_ids,
366 .driver = {
367 .name = KBUILD_MODNAME,
368 .pm = &hid_sensor_pm_ops,
369 },
370 .probe = hid_dev_rot_probe,
371 .remove = hid_dev_rot_remove,
372};
373module_platform_driver(hid_dev_rot_platform_driver);
374
375MODULE_DESCRIPTION("HID Sensor Device Rotation");
376MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
377MODULE_LICENSE("GPL");
378
