1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * HID Sensors Driver
4  * Copyright (c) 2012, Intel Corporation.
5  */
6 #include <linux/device.h>
7 #include <linux/platform_device.h>
8 #include <linux/module.h>
9 #include <linux/mod_devicetable.h>
10 #include <linux/slab.h>
11 #include <linux/hid-sensor-hub.h>
12 #include <linux/iio/iio.h>
13 #include <linux/iio/buffer.h>
14 #include "../common/hid-sensors/hid-sensor-trigger.h"
15 
16 enum gyro_3d_channel {
17 	CHANNEL_SCAN_INDEX_X,
18 	CHANNEL_SCAN_INDEX_Y,
19 	CHANNEL_SCAN_INDEX_Z,
20 	GYRO_3D_CHANNEL_MAX,
21 };
22 
23 #define CHANNEL_SCAN_INDEX_TIMESTAMP GYRO_3D_CHANNEL_MAX
24 struct gyro_3d_state {
25 	struct hid_sensor_hub_callbacks callbacks;
26 	struct hid_sensor_common common_attributes;
27 	struct hid_sensor_hub_attribute_info gyro[GYRO_3D_CHANNEL_MAX];
28 	struct {
29 		u32 gyro_val[GYRO_3D_CHANNEL_MAX];
30 		u64 timestamp __aligned(8);
31 	} scan;
32 	int scale_pre_decml;
33 	int scale_post_decml;
34 	int scale_precision;
35 	int value_offset;
36 	s64 timestamp;
37 };
38 
39 static const u32 gyro_3d_addresses[GYRO_3D_CHANNEL_MAX] = {
40 	HID_USAGE_SENSOR_ANGL_VELOCITY_X_AXIS,
41 	HID_USAGE_SENSOR_ANGL_VELOCITY_Y_AXIS,
42 	HID_USAGE_SENSOR_ANGL_VELOCITY_Z_AXIS
43 };
44 
45 static const u32 gryo_3d_sensitivity_addresses[] = {
46 	HID_USAGE_SENSOR_DATA_ANGL_VELOCITY,
47 };
48 
49 /* Channel definitions */
50 static const struct iio_chan_spec gyro_3d_channels[] = {
51 	{
52 		.type = IIO_ANGL_VEL,
53 		.modified = 1,
54 		.channel2 = IIO_MOD_X,
55 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
56 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
57 		BIT(IIO_CHAN_INFO_SCALE) |
58 		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
59 		BIT(IIO_CHAN_INFO_HYSTERESIS),
60 		.scan_index = CHANNEL_SCAN_INDEX_X,
61 	}, {
62 		.type = IIO_ANGL_VEL,
63 		.modified = 1,
64 		.channel2 = IIO_MOD_Y,
65 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
66 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
67 		BIT(IIO_CHAN_INFO_SCALE) |
68 		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
69 		BIT(IIO_CHAN_INFO_HYSTERESIS),
70 		.scan_index = CHANNEL_SCAN_INDEX_Y,
71 	}, {
72 		.type = IIO_ANGL_VEL,
73 		.modified = 1,
74 		.channel2 = IIO_MOD_Z,
75 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
76 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
77 		BIT(IIO_CHAN_INFO_SCALE) |
78 		BIT(IIO_CHAN_INFO_SAMP_FREQ) |
79 		BIT(IIO_CHAN_INFO_HYSTERESIS),
80 		.scan_index = CHANNEL_SCAN_INDEX_Z,
81 	},
82 	IIO_CHAN_SOFT_TIMESTAMP(CHANNEL_SCAN_INDEX_TIMESTAMP)
83 };
84 
85 /* Adjust channel real bits based on report descriptor */
86 static void gyro_3d_adjust_channel_bit_mask(struct iio_chan_spec *channels,
87 						int channel, int size)
88 {
89 	channels[channel].scan_type.sign = 's';
90 	/* Real storage bits will change based on the report desc. */
91 	channels[channel].scan_type.realbits = size * 8;
92 	/* Maximum size of a sample to capture is u32 */
93 	channels[channel].scan_type.storagebits = sizeof(u32) * 8;
94 }
95 
96 /* Channel read_raw handler */
97 static int gyro_3d_read_raw(struct iio_dev *indio_dev,
98 			      struct iio_chan_spec const *chan,
99 			      int *val, int *val2,
100 			      long mask)
101 {
102 	struct gyro_3d_state *gyro_state = iio_priv(indio_dev);
103 	int report_id = -1;
104 	u32 address;
105 	int ret_type;
106 	s32 min;
107 
108 	*val = 0;
109 	*val2 = 0;
110 	switch (mask) {
111 	case IIO_CHAN_INFO_RAW:
112 		hid_sensor_power_state(&gyro_state->common_attributes, true);
113 		report_id = gyro_state->gyro[chan->scan_index].report_id;
114 		min = gyro_state->gyro[chan->scan_index].logical_minimum;
115 		address = gyro_3d_addresses[chan->scan_index];
116 		if (report_id >= 0)
117 			*val = sensor_hub_input_attr_get_raw_value(
118 					gyro_state->common_attributes.hsdev,
119 					HID_USAGE_SENSOR_GYRO_3D, address,
120 					report_id,
121 					SENSOR_HUB_SYNC,
122 					min < 0);
123 		else {
124 			*val = 0;
125 			hid_sensor_power_state(&gyro_state->common_attributes,
126 						false);
127 			return -EINVAL;
128 		}
129 		hid_sensor_power_state(&gyro_state->common_attributes, false);
130 		ret_type = IIO_VAL_INT;
131 		break;
132 	case IIO_CHAN_INFO_SCALE:
133 		*val = gyro_state->scale_pre_decml;
134 		*val2 = gyro_state->scale_post_decml;
135 		ret_type = gyro_state->scale_precision;
136 		break;
137 	case IIO_CHAN_INFO_OFFSET:
138 		*val = gyro_state->value_offset;
139 		ret_type = IIO_VAL_INT;
140 		break;
141 	case IIO_CHAN_INFO_SAMP_FREQ:
142 		ret_type = hid_sensor_read_samp_freq_value(
143 			&gyro_state->common_attributes, val, val2);
144 		break;
145 	case IIO_CHAN_INFO_HYSTERESIS:
146 		ret_type = hid_sensor_read_raw_hyst_value(
147 			&gyro_state->common_attributes, val, val2);
148 		break;
149 	default:
150 		ret_type = -EINVAL;
151 		break;
152 	}
153 
154 	return ret_type;
155 }
156 
157 /* Channel write_raw handler */
158 static int gyro_3d_write_raw(struct iio_dev *indio_dev,
159 			       struct iio_chan_spec const *chan,
160 			       int val,
161 			       int val2,
162 			       long mask)
163 {
164 	struct gyro_3d_state *gyro_state = iio_priv(indio_dev);
165 	int ret = 0;
166 
167 	switch (mask) {
168 	case IIO_CHAN_INFO_SAMP_FREQ:
169 		ret = hid_sensor_write_samp_freq_value(
170 				&gyro_state->common_attributes, val, val2);
171 		break;
172 	case IIO_CHAN_INFO_HYSTERESIS:
173 		ret = hid_sensor_write_raw_hyst_value(
174 				&gyro_state->common_attributes, val, val2);
175 		break;
176 	default:
177 		ret = -EINVAL;
178 	}
179 
180 	return ret;
181 }
182 
183 static const struct iio_info gyro_3d_info = {
184 	.read_raw = &gyro_3d_read_raw,
185 	.write_raw = &gyro_3d_write_raw,
186 };
187 
188 /* Callback handler to send event after all samples are received and captured */
189 static int gyro_3d_proc_event(struct hid_sensor_hub_device *hsdev,
190 				unsigned usage_id,
191 				void *priv)
192 {
193 	struct iio_dev *indio_dev = platform_get_drvdata(priv);
194 	struct gyro_3d_state *gyro_state = iio_priv(indio_dev);
195 
196 	dev_dbg(&indio_dev->dev, "gyro_3d_proc_event\n");
197 	if (atomic_read(&gyro_state->common_attributes.data_ready)) {
198 		if (!gyro_state->timestamp)
199 			gyro_state->timestamp = iio_get_time_ns(indio_dev);
200 
201 		iio_push_to_buffers_with_timestamp(indio_dev, &gyro_state->scan,
202 						   gyro_state->timestamp);
203 
204 		gyro_state->timestamp = 0;
205 	}
206 
207 	return 0;
208 }
209 
210 /* Capture samples in local storage */
211 static int gyro_3d_capture_sample(struct hid_sensor_hub_device *hsdev,
212 				unsigned usage_id,
213 				size_t raw_len, char *raw_data,
214 				void *priv)
215 {
216 	struct iio_dev *indio_dev = platform_get_drvdata(priv);
217 	struct gyro_3d_state *gyro_state = iio_priv(indio_dev);
218 	int offset;
219 	int ret = -EINVAL;
220 
221 	switch (usage_id) {
222 	case HID_USAGE_SENSOR_ANGL_VELOCITY_X_AXIS:
223 	case HID_USAGE_SENSOR_ANGL_VELOCITY_Y_AXIS:
224 	case HID_USAGE_SENSOR_ANGL_VELOCITY_Z_AXIS:
225 		offset = usage_id - HID_USAGE_SENSOR_ANGL_VELOCITY_X_AXIS;
226 		gyro_state->scan.gyro_val[CHANNEL_SCAN_INDEX_X + offset] =
227 				*(u32 *)raw_data;
228 		ret = 0;
229 	break;
230 	case HID_USAGE_SENSOR_TIME_TIMESTAMP:
231 		gyro_state->timestamp =
232 			hid_sensor_convert_timestamp(&gyro_state->common_attributes,
233 						     *(s64 *)raw_data);
234 	break;
235 	default:
236 		break;
237 	}
238 
239 	return ret;
240 }
241 
242 /* Parse report which is specific to an usage id*/
243 static int gyro_3d_parse_report(struct platform_device *pdev,
244 				struct hid_sensor_hub_device *hsdev,
245 				struct iio_chan_spec *channels,
246 				unsigned usage_id,
247 				struct gyro_3d_state *st)
248 {
249 	int ret;
250 	int i;
251 
252 	for (i = 0; i <= CHANNEL_SCAN_INDEX_Z; ++i) {
253 		ret = sensor_hub_input_get_attribute_info(hsdev,
254 				HID_INPUT_REPORT,
255 				usage_id,
256 				HID_USAGE_SENSOR_ANGL_VELOCITY_X_AXIS + i,
257 				&st->gyro[CHANNEL_SCAN_INDEX_X + i]);
258 		if (ret < 0)
259 			break;
260 		gyro_3d_adjust_channel_bit_mask(channels,
261 				CHANNEL_SCAN_INDEX_X + i,
262 				st->gyro[CHANNEL_SCAN_INDEX_X + i].size);
263 	}
264 	dev_dbg(&pdev->dev, "gyro_3d %x:%x, %x:%x, %x:%x\n",
265 			st->gyro[0].index,
266 			st->gyro[0].report_id,
267 			st->gyro[1].index, st->gyro[1].report_id,
268 			st->gyro[2].index, st->gyro[2].report_id);
269 
270 	st->scale_precision = hid_sensor_format_scale(
271 				HID_USAGE_SENSOR_GYRO_3D,
272 				&st->gyro[CHANNEL_SCAN_INDEX_X],
273 				&st->scale_pre_decml, &st->scale_post_decml);
274 
275 	return ret;
276 }
277 
278 /* Function to initialize the processing for usage id */
279 static int hid_gyro_3d_probe(struct platform_device *pdev)
280 {
281 	int ret = 0;
282 	static const char *name = "gyro_3d";
283 	struct iio_dev *indio_dev;
284 	struct gyro_3d_state *gyro_state;
285 	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
286 
287 	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*gyro_state));
288 	if (!indio_dev)
289 		return -ENOMEM;
290 	platform_set_drvdata(pdev, indio_dev);
291 
292 	gyro_state = iio_priv(indio_dev);
293 	gyro_state->common_attributes.hsdev = hsdev;
294 	gyro_state->common_attributes.pdev = pdev;
295 
296 	ret = hid_sensor_parse_common_attributes(hsdev,
297 						HID_USAGE_SENSOR_GYRO_3D,
298 						&gyro_state->common_attributes,
299 						gryo_3d_sensitivity_addresses,
300 						ARRAY_SIZE(gryo_3d_sensitivity_addresses));
301 	if (ret) {
302 		dev_err(&pdev->dev, "failed to setup common attributes\n");
303 		return ret;
304 	}
305 
306 	indio_dev->channels = devm_kmemdup(&pdev->dev, gyro_3d_channels,
307 					   sizeof(gyro_3d_channels), GFP_KERNEL);
308 	if (!indio_dev->channels) {
309 		dev_err(&pdev->dev, "failed to duplicate channels\n");
310 		return -ENOMEM;
311 	}
312 
313 	ret = gyro_3d_parse_report(pdev, hsdev,
314 				   (struct iio_chan_spec *)indio_dev->channels,
315 				   HID_USAGE_SENSOR_GYRO_3D, gyro_state);
316 	if (ret) {
317 		dev_err(&pdev->dev, "failed to setup attributes\n");
318 		return ret;
319 	}
320 
321 	indio_dev->num_channels = ARRAY_SIZE(gyro_3d_channels);
322 	indio_dev->info = &gyro_3d_info;
323 	indio_dev->name = name;
324 	indio_dev->modes = INDIO_DIRECT_MODE;
325 
326 	atomic_set(&gyro_state->common_attributes.data_ready, 0);
327 
328 	ret = hid_sensor_setup_trigger(indio_dev, name,
329 					&gyro_state->common_attributes);
330 	if (ret < 0) {
331 		dev_err(&pdev->dev, "trigger setup failed\n");
332 		return ret;
333 	}
334 
335 	ret = iio_device_register(indio_dev);
336 	if (ret) {
337 		dev_err(&pdev->dev, "device register failed\n");
338 		goto error_remove_trigger;
339 	}
340 
341 	gyro_state->callbacks.send_event = gyro_3d_proc_event;
342 	gyro_state->callbacks.capture_sample = gyro_3d_capture_sample;
343 	gyro_state->callbacks.pdev = pdev;
344 	ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_GYRO_3D,
345 					&gyro_state->callbacks);
346 	if (ret < 0) {
347 		dev_err(&pdev->dev, "callback reg failed\n");
348 		goto error_iio_unreg;
349 	}
350 
351 	return ret;
352 
353 error_iio_unreg:
354 	iio_device_unregister(indio_dev);
355 error_remove_trigger:
356 	hid_sensor_remove_trigger(indio_dev, &gyro_state->common_attributes);
357 	return ret;
358 }
359 
360 /* Function to deinitialize the processing for usage id */
361 static int hid_gyro_3d_remove(struct platform_device *pdev)
362 {
363 	struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
364 	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
365 	struct gyro_3d_state *gyro_state = iio_priv(indio_dev);
366 
367 	sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_GYRO_3D);
368 	iio_device_unregister(indio_dev);
369 	hid_sensor_remove_trigger(indio_dev, &gyro_state->common_attributes);
370 
371 	return 0;
372 }
373 
374 static const struct platform_device_id hid_gyro_3d_ids[] = {
375 	{
376 		/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
377 		.name = "HID-SENSOR-200076",
378 	},
379 	{ /* sentinel */ }
380 };
381 MODULE_DEVICE_TABLE(platform, hid_gyro_3d_ids);
382 
383 static struct platform_driver hid_gyro_3d_platform_driver = {
384 	.id_table = hid_gyro_3d_ids,
385 	.driver = {
386 		.name	= KBUILD_MODNAME,
387 		.pm	= &hid_sensor_pm_ops,
388 	},
389 	.probe		= hid_gyro_3d_probe,
390 	.remove		= hid_gyro_3d_remove,
391 };
392 module_platform_driver(hid_gyro_3d_platform_driver);
393 
394 MODULE_DESCRIPTION("HID Sensor Gyroscope 3D");
395 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
396 MODULE_LICENSE("GPL");
397 MODULE_IMPORT_NS(IIO_HID);
398