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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 "../common/hid-sensors/hid-sensor-trigger.h"
18
19struct dev_rot_state {
20 struct hid_sensor_hub_callbacks callbacks;
21 struct hid_sensor_common common_attributes;
22 struct hid_sensor_hub_attribute_info quaternion;
23 u32 sampled_vals[4];
24 int scale_pre_decml;
25 int scale_post_decml;
26 int scale_precision;
27 int value_offset;
28};
29
30
31static const struct iio_chan_spec dev_rot_channels[] = {
32 {
33 .type = IIO_ROT,
34 .modified = 1,
35 .channel2 = IIO_MOD_QUATERNION,
36 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
37 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) |
38 BIT(IIO_CHAN_INFO_OFFSET) |
39 BIT(IIO_CHAN_INFO_SCALE) |
40 BIT(IIO_CHAN_INFO_HYSTERESIS)
41 }
42};
43
44
45static void dev_rot_adjust_channel_bit_mask(struct iio_chan_spec *chan,
46 int size)
47{
48 chan->scan_type.sign = 's';
49
50 chan->scan_type.realbits = size * 8;
51
52 chan->scan_type.storagebits = sizeof(u32) * 8;
53 chan->scan_type.repeat = 4;
54}
55
56
57static int dev_rot_read_raw(struct iio_dev *indio_dev,
58 struct iio_chan_spec const *chan,
59 int size, int *vals, int *val_len,
60 long mask)
61{
62 struct dev_rot_state *rot_state = iio_priv(indio_dev);
63 int ret_type;
64 int i;
65
66 vals[0] = 0;
67 vals[1] = 0;
68
69 switch (mask) {
70 case IIO_CHAN_INFO_RAW:
71 if (size >= 4) {
72 for (i = 0; i < 4; ++i)
73 vals[i] = rot_state->sampled_vals[i];
74 ret_type = IIO_VAL_INT_MULTIPLE;
75 *val_len = 4;
76 } else
77 ret_type = -EINVAL;
78 break;
79 case IIO_CHAN_INFO_SCALE:
80 vals[0] = rot_state->scale_pre_decml;
81 vals[1] = rot_state->scale_post_decml;
82 return rot_state->scale_precision;
83
84 case IIO_CHAN_INFO_OFFSET:
85 *vals = rot_state->value_offset;
86 return IIO_VAL_INT;
87
88 case IIO_CHAN_INFO_SAMP_FREQ:
89 ret_type = hid_sensor_read_samp_freq_value(
90 &rot_state->common_attributes, &vals[0], &vals[1]);
91 break;
92 case IIO_CHAN_INFO_HYSTERESIS:
93 ret_type = hid_sensor_read_raw_hyst_value(
94 &rot_state->common_attributes, &vals[0], &vals[1]);
95 break;
96 default:
97 ret_type = -EINVAL;
98 break;
99 }
100
101 return ret_type;
102}
103
104
105static int dev_rot_write_raw(struct iio_dev *indio_dev,
106 struct iio_chan_spec const *chan,
107 int val,
108 int val2,
109 long mask)
110{
111 struct dev_rot_state *rot_state = iio_priv(indio_dev);
112 int ret;
113
114 switch (mask) {
115 case IIO_CHAN_INFO_SAMP_FREQ:
116 ret = hid_sensor_write_samp_freq_value(
117 &rot_state->common_attributes, val, val2);
118 break;
119 case IIO_CHAN_INFO_HYSTERESIS:
120 ret = hid_sensor_write_raw_hyst_value(
121 &rot_state->common_attributes, val, val2);
122 break;
123 default:
124 ret = -EINVAL;
125 }
126
127 return ret;
128}
129
130static const struct iio_info dev_rot_info = {
131 .read_raw_multi = &dev_rot_read_raw,
132 .write_raw = &dev_rot_write_raw,
133};
134
135
136static void hid_sensor_push_data(struct iio_dev *indio_dev, u8 *data, int len)
137{
138 dev_dbg(&indio_dev->dev, "hid_sensor_push_data >>\n");
139 iio_push_to_buffers(indio_dev, (u8 *)data);
140 dev_dbg(&indio_dev->dev, "hid_sensor_push_data <<\n");
141
142}
143
144
145static int dev_rot_proc_event(struct hid_sensor_hub_device *hsdev,
146 unsigned usage_id,
147 void *priv)
148{
149 struct iio_dev *indio_dev = platform_get_drvdata(priv);
150 struct dev_rot_state *rot_state = iio_priv(indio_dev);
151
152 dev_dbg(&indio_dev->dev, "dev_rot_proc_event\n");
153 if (atomic_read(&rot_state->common_attributes.data_ready))
154 hid_sensor_push_data(indio_dev,
155 (u8 *)rot_state->sampled_vals,
156 sizeof(rot_state->sampled_vals));
157
158 return 0;
159}
160
161
162static int dev_rot_capture_sample(struct hid_sensor_hub_device *hsdev,
163 unsigned usage_id,
164 size_t raw_len, char *raw_data,
165 void *priv)
166{
167 struct iio_dev *indio_dev = platform_get_drvdata(priv);
168 struct dev_rot_state *rot_state = iio_priv(indio_dev);
169
170 if (usage_id == HID_USAGE_SENSOR_ORIENT_QUATERNION) {
171 memcpy(rot_state->sampled_vals, raw_data,
172 sizeof(rot_state->sampled_vals));
173 dev_dbg(&indio_dev->dev, "Recd Quat len:%zu::%zu\n", raw_len,
174 sizeof(rot_state->sampled_vals));
175 }
176
177 return 0;
178}
179
180
181static int dev_rot_parse_report(struct platform_device *pdev,
182 struct hid_sensor_hub_device *hsdev,
183 struct iio_chan_spec *channels,
184 unsigned usage_id,
185 struct dev_rot_state *st)
186{
187 int ret;
188
189 ret = sensor_hub_input_get_attribute_info(hsdev,
190 HID_INPUT_REPORT,
191 usage_id,
192 HID_USAGE_SENSOR_ORIENT_QUATERNION,
193 &st->quaternion);
194 if (ret)
195 return ret;
196
197 dev_rot_adjust_channel_bit_mask(&channels[0],
198 st->quaternion.size / 4);
199
200 dev_dbg(&pdev->dev, "dev_rot %x:%x\n", st->quaternion.index,
201 st->quaternion.report_id);
202
203 dev_dbg(&pdev->dev, "dev_rot: attrib size %d\n",
204 st->quaternion.size);
205
206 st->scale_precision = hid_sensor_format_scale(
207 hsdev->usage,
208 &st->quaternion,
209 &st->scale_pre_decml, &st->scale_post_decml);
210
211
212 if (st->common_attributes.sensitivity.index < 0) {
213 sensor_hub_input_get_attribute_info(hsdev,
214 HID_FEATURE_REPORT, usage_id,
215 HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
216 HID_USAGE_SENSOR_DATA_ORIENTATION,
217 &st->common_attributes.sensitivity);
218 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
219 st->common_attributes.sensitivity.index,
220 st->common_attributes.sensitivity.report_id);
221 }
222
223 return 0;
224}
225
226
227static int hid_dev_rot_probe(struct platform_device *pdev)
228{
229 int ret;
230 char *name;
231 struct iio_dev *indio_dev;
232 struct dev_rot_state *rot_state;
233 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
234
235 indio_dev = devm_iio_device_alloc(&pdev->dev,
236 sizeof(struct dev_rot_state));
237 if (indio_dev == NULL)
238 return -ENOMEM;
239
240 platform_set_drvdata(pdev, indio_dev);
241
242 rot_state = iio_priv(indio_dev);
243 rot_state->common_attributes.hsdev = hsdev;
244 rot_state->common_attributes.pdev = pdev;
245
246 switch (hsdev->usage) {
247 case HID_USAGE_SENSOR_DEVICE_ORIENTATION:
248 name = "dev_rotation";
249 break;
250 case HID_USAGE_SENSOR_RELATIVE_ORIENTATION:
251 name = "relative_orientation";
252 break;
253 case HID_USAGE_SENSOR_GEOMAGNETIC_ORIENTATION:
254 name = "geomagnetic_orientation";
255 break;
256 default:
257 return -EINVAL;
258 }
259
260 ret = hid_sensor_parse_common_attributes(hsdev, hsdev->usage,
261 &rot_state->common_attributes);
262 if (ret) {
263 dev_err(&pdev->dev, "failed to setup common attributes\n");
264 return ret;
265 }
266
267 indio_dev->channels = devm_kmemdup(&pdev->dev, dev_rot_channels,
268 sizeof(dev_rot_channels),
269 GFP_KERNEL);
270 if (!indio_dev->channels) {
271 dev_err(&pdev->dev, "failed to duplicate channels\n");
272 return -ENOMEM;
273 }
274
275 ret = dev_rot_parse_report(pdev, hsdev,
276 (struct iio_chan_spec *)indio_dev->channels,
277 hsdev->usage, rot_state);
278 if (ret) {
279 dev_err(&pdev->dev, "failed to setup attributes\n");
280 return ret;
281 }
282
283 indio_dev->num_channels = ARRAY_SIZE(dev_rot_channels);
284 indio_dev->info = &dev_rot_info;
285 indio_dev->name = name;
286 indio_dev->modes = INDIO_DIRECT_MODE;
287
288 atomic_set(&rot_state->common_attributes.data_ready, 0);
289
290 ret = hid_sensor_setup_trigger(indio_dev, name,
291 &rot_state->common_attributes);
292 if (ret) {
293 dev_err(&pdev->dev, "trigger setup failed\n");
294 return ret;
295 }
296
297 ret = iio_device_register(indio_dev);
298 if (ret) {
299 dev_err(&pdev->dev, "device register failed\n");
300 goto error_remove_trigger;
301 }
302
303 rot_state->callbacks.send_event = dev_rot_proc_event;
304 rot_state->callbacks.capture_sample = dev_rot_capture_sample;
305 rot_state->callbacks.pdev = pdev;
306 ret = sensor_hub_register_callback(hsdev, hsdev->usage,
307 &rot_state->callbacks);
308 if (ret) {
309 dev_err(&pdev->dev, "callback reg failed\n");
310 goto error_iio_unreg;
311 }
312
313 return 0;
314
315error_iio_unreg:
316 iio_device_unregister(indio_dev);
317error_remove_trigger:
318 hid_sensor_remove_trigger(indio_dev, &rot_state->common_attributes);
319 return ret;
320}
321
322
323static int hid_dev_rot_remove(struct platform_device *pdev)
324{
325 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
326 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
327 struct dev_rot_state *rot_state = iio_priv(indio_dev);
328
329 sensor_hub_remove_callback(hsdev, hsdev->usage);
330 iio_device_unregister(indio_dev);
331 hid_sensor_remove_trigger(indio_dev, &rot_state->common_attributes);
332
333 return 0;
334}
335
336static const struct platform_device_id hid_dev_rot_ids[] = {
337 {
338
339 .name = "HID-SENSOR-20008a",
340 },
341 {
342
343 .name = "HID-SENSOR-20008e",
344 },
345 {
346
347 .name = "HID-SENSOR-2000c1",
348 },
349 { }
350};
351MODULE_DEVICE_TABLE(platform, hid_dev_rot_ids);
352
353static struct platform_driver hid_dev_rot_platform_driver = {
354 .id_table = hid_dev_rot_ids,
355 .driver = {
356 .name = KBUILD_MODNAME,
357 .pm = &hid_sensor_pm_ops,
358 },
359 .probe = hid_dev_rot_probe,
360 .remove = hid_dev_rot_remove,
361};
362module_platform_driver(hid_dev_rot_platform_driver);
363
364MODULE_DESCRIPTION("HID Sensor Device Rotation");
365MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
366MODULE_LICENSE("GPL");
367
