3 * Copyright (c) 2012, Intel Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
19 #include <linux/device.h>
20 #include <linux/platform_device.h>
21 #include <linux/module.h>
22 #include <linux/interrupt.h>
23 #include <linux/irq.h>
24 #include <linux/slab.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"
33 enum gyro_3d_channel {
40 struct gyro_3d_state {
41 struct hid_sensor_hub_callbacks callbacks;
42 struct hid_sensor_common common_attributes;
43 struct hid_sensor_hub_attribute_info gyro[GYRO_3D_CHANNEL_MAX];
44 u32 gyro_val[GYRO_3D_CHANNEL_MAX];
47 static const u32 gyro_3d_addresses[GYRO_3D_CHANNEL_MAX] = {
48 HID_USAGE_SENSOR_ANGL_VELOCITY_X_AXIS,
49 HID_USAGE_SENSOR_ANGL_VELOCITY_Y_AXIS,
50 HID_USAGE_SENSOR_ANGL_VELOCITY_Z_AXIS
53 /* Channel definitions */
54 static const struct iio_chan_spec gyro_3d_channels[] = {
58 .channel2 = IIO_MOD_X,
59 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
60 BIT(IIO_CHAN_INFO_SCALE) |
61 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
62 BIT(IIO_CHAN_INFO_HYSTERESIS),
63 .scan_index = CHANNEL_SCAN_INDEX_X,
67 .channel2 = IIO_MOD_Y,
68 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
69 BIT(IIO_CHAN_INFO_SCALE) |
70 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
71 BIT(IIO_CHAN_INFO_HYSTERESIS),
72 .scan_index = CHANNEL_SCAN_INDEX_Y,
76 .channel2 = IIO_MOD_Z,
77 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
78 BIT(IIO_CHAN_INFO_SCALE) |
79 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
80 BIT(IIO_CHAN_INFO_HYSTERESIS),
81 .scan_index = CHANNEL_SCAN_INDEX_Z,
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)
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;
96 /* Channel read_raw handler */
97 static int gyro_3d_read_raw(struct iio_dev *indio_dev,
98 struct iio_chan_spec const *chan,
102 struct gyro_3d_state *gyro_state = iio_priv(indio_dev);
112 report_id = gyro_state->gyro[chan->scan_index].report_id;
113 address = gyro_3d_addresses[chan->scan_index];
115 *val = sensor_hub_input_attr_get_raw_value(
116 gyro_state->common_attributes.hsdev,
117 HID_USAGE_SENSOR_GYRO_3D, address,
123 ret_type = IIO_VAL_INT;
125 case IIO_CHAN_INFO_SCALE:
126 *val = gyro_state->gyro[CHANNEL_SCAN_INDEX_X].units;
127 ret_type = IIO_VAL_INT;
129 case IIO_CHAN_INFO_OFFSET:
130 *val = hid_sensor_convert_exponent(
131 gyro_state->gyro[CHANNEL_SCAN_INDEX_X].unit_expo);
132 ret_type = IIO_VAL_INT;
134 case IIO_CHAN_INFO_SAMP_FREQ:
135 ret = hid_sensor_read_samp_freq_value(
136 &gyro_state->common_attributes, val, val2);
137 ret_type = IIO_VAL_INT_PLUS_MICRO;
139 case IIO_CHAN_INFO_HYSTERESIS:
140 ret = hid_sensor_read_raw_hyst_value(
141 &gyro_state->common_attributes, val, val2);
142 ret_type = IIO_VAL_INT_PLUS_MICRO;
152 /* Channel write_raw handler */
153 static int gyro_3d_write_raw(struct iio_dev *indio_dev,
154 struct iio_chan_spec const *chan,
159 struct gyro_3d_state *gyro_state = iio_priv(indio_dev);
163 case IIO_CHAN_INFO_SAMP_FREQ:
164 ret = hid_sensor_write_samp_freq_value(
165 &gyro_state->common_attributes, val, val2);
167 case IIO_CHAN_INFO_HYSTERESIS:
168 ret = hid_sensor_write_raw_hyst_value(
169 &gyro_state->common_attributes, val, val2);
178 static const struct iio_info gyro_3d_info = {
179 .driver_module = THIS_MODULE,
180 .read_raw = &gyro_3d_read_raw,
181 .write_raw = &gyro_3d_write_raw,
184 /* Function to push data to buffer */
185 static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
188 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
189 iio_push_to_buffers(indio_dev, data);
192 /* Callback handler to send event after all samples are received and captured */
193 static int gyro_3d_proc_event(struct hid_sensor_hub_device *hsdev,
197 struct iio_dev *indio_dev = platform_get_drvdata(priv);
198 struct gyro_3d_state *gyro_state = iio_priv(indio_dev);
200 dev_dbg(&indio_dev->dev, "gyro_3d_proc_event [%d]\n",
201 gyro_state->common_attributes.data_ready);
202 if (gyro_state->common_attributes.data_ready)
203 hid_sensor_push_data(indio_dev,
204 gyro_state->gyro_val,
205 sizeof(gyro_state->gyro_val));
210 /* Capture samples in local storage */
211 static int gyro_3d_capture_sample(struct hid_sensor_hub_device *hsdev,
213 size_t raw_len, char *raw_data,
216 struct iio_dev *indio_dev = platform_get_drvdata(priv);
217 struct gyro_3d_state *gyro_state = iio_priv(indio_dev);
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->gyro_val[CHANNEL_SCAN_INDEX_X + offset] =
237 /* Parse report which is specific to an usage id*/
238 static int gyro_3d_parse_report(struct platform_device *pdev,
239 struct hid_sensor_hub_device *hsdev,
240 struct iio_chan_spec *channels,
242 struct gyro_3d_state *st)
247 for (i = 0; i <= CHANNEL_SCAN_INDEX_Z; ++i) {
248 ret = sensor_hub_input_get_attribute_info(hsdev,
251 HID_USAGE_SENSOR_ANGL_VELOCITY_X_AXIS + i,
252 &st->gyro[CHANNEL_SCAN_INDEX_X + i]);
255 gyro_3d_adjust_channel_bit_mask(channels,
256 CHANNEL_SCAN_INDEX_X + i,
257 st->gyro[CHANNEL_SCAN_INDEX_X + i].size);
259 dev_dbg(&pdev->dev, "gyro_3d %x:%x, %x:%x, %x:%x\n",
261 st->gyro[0].report_id,
262 st->gyro[1].index, st->gyro[1].report_id,
263 st->gyro[2].index, st->gyro[2].report_id);
268 /* Function to initialize the processing for usage id */
269 static int hid_gyro_3d_probe(struct platform_device *pdev)
272 static const char *name = "gyro_3d";
273 struct iio_dev *indio_dev;
274 struct gyro_3d_state *gyro_state;
275 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
276 struct iio_chan_spec *channels;
278 indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*gyro_state));
281 platform_set_drvdata(pdev, indio_dev);
283 gyro_state = iio_priv(indio_dev);
284 gyro_state->common_attributes.hsdev = hsdev;
285 gyro_state->common_attributes.pdev = pdev;
287 ret = hid_sensor_parse_common_attributes(hsdev,
288 HID_USAGE_SENSOR_GYRO_3D,
289 &gyro_state->common_attributes);
291 dev_err(&pdev->dev, "failed to setup common attributes\n");
295 channels = kmemdup(gyro_3d_channels, sizeof(gyro_3d_channels),
298 dev_err(&pdev->dev, "failed to duplicate channels\n");
302 ret = gyro_3d_parse_report(pdev, hsdev, channels,
303 HID_USAGE_SENSOR_GYRO_3D, gyro_state);
305 dev_err(&pdev->dev, "failed to setup attributes\n");
306 goto error_free_dev_mem;
309 indio_dev->channels = channels;
310 indio_dev->num_channels = ARRAY_SIZE(gyro_3d_channels);
311 indio_dev->dev.parent = &pdev->dev;
312 indio_dev->info = &gyro_3d_info;
313 indio_dev->name = name;
314 indio_dev->modes = INDIO_DIRECT_MODE;
316 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
319 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
320 goto error_free_dev_mem;
322 gyro_state->common_attributes.data_ready = false;
323 ret = hid_sensor_setup_trigger(indio_dev, name,
324 &gyro_state->common_attributes);
326 dev_err(&pdev->dev, "trigger setup failed\n");
327 goto error_unreg_buffer_funcs;
330 ret = iio_device_register(indio_dev);
332 dev_err(&pdev->dev, "device register failed\n");
333 goto error_remove_trigger;
336 gyro_state->callbacks.send_event = gyro_3d_proc_event;
337 gyro_state->callbacks.capture_sample = gyro_3d_capture_sample;
338 gyro_state->callbacks.pdev = pdev;
339 ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_GYRO_3D,
340 &gyro_state->callbacks);
342 dev_err(&pdev->dev, "callback reg failed\n");
343 goto error_iio_unreg;
349 iio_device_unregister(indio_dev);
350 error_remove_trigger:
351 hid_sensor_remove_trigger(&gyro_state->common_attributes);
352 error_unreg_buffer_funcs:
353 iio_triggered_buffer_cleanup(indio_dev);
355 kfree(indio_dev->channels);
359 /* Function to deinitialize the processing for usage id */
360 static int hid_gyro_3d_remove(struct platform_device *pdev)
362 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
363 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
364 struct gyro_3d_state *gyro_state = iio_priv(indio_dev);
366 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_GYRO_3D);
367 iio_device_unregister(indio_dev);
368 hid_sensor_remove_trigger(&gyro_state->common_attributes);
369 iio_triggered_buffer_cleanup(indio_dev);
370 kfree(indio_dev->channels);
375 static struct platform_device_id hid_gyro_3d_ids[] = {
377 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
378 .name = "HID-SENSOR-200076",
382 MODULE_DEVICE_TABLE(platform, hid_gyro_3d_ids);
384 static struct platform_driver hid_gyro_3d_platform_driver = {
385 .id_table = hid_gyro_3d_ids,
387 .name = KBUILD_MODNAME,
388 .owner = THIS_MODULE,
390 .probe = hid_gyro_3d_probe,
391 .remove = hid_gyro_3d_remove,
393 module_platform_driver(hid_gyro_3d_platform_driver);
395 MODULE_DESCRIPTION("HID Sensor Gyroscope 3D");
396 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
397 MODULE_LICENSE("GPL");