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-attributes.h"
32 #include "../common/hid-sensors/hid-sensor-trigger.h"
34 /*Format: HID-SENSOR-usage_id_in_hex*/
35 /*Usage ID from spec for Gyro-3D: 0x200076*/
36 #define DRIVER_NAME "HID-SENSOR-200076"
38 enum gyro_3d_channel {
45 struct gyro_3d_state {
46 struct hid_sensor_hub_callbacks callbacks;
47 struct hid_sensor_iio_common common_attributes;
48 struct hid_sensor_hub_attribute_info gyro[GYRO_3D_CHANNEL_MAX];
49 u32 gyro_val[GYRO_3D_CHANNEL_MAX];
52 static const u32 gyro_3d_addresses[GYRO_3D_CHANNEL_MAX] = {
53 HID_USAGE_SENSOR_ANGL_VELOCITY_X_AXIS,
54 HID_USAGE_SENSOR_ANGL_VELOCITY_Y_AXIS,
55 HID_USAGE_SENSOR_ANGL_VELOCITY_Z_AXIS
58 /* Channel definitions */
59 static const struct iio_chan_spec gyro_3d_channels[] = {
63 .channel2 = IIO_MOD_X,
64 .info_mask = IIO_CHAN_INFO_OFFSET_SHARED_BIT |
65 IIO_CHAN_INFO_SCALE_SHARED_BIT |
66 IIO_CHAN_INFO_SAMP_FREQ_SHARED_BIT |
67 IIO_CHAN_INFO_HYSTERESIS_SHARED_BIT,
68 .scan_index = CHANNEL_SCAN_INDEX_X,
72 .channel2 = IIO_MOD_Y,
73 .info_mask = IIO_CHAN_INFO_OFFSET_SHARED_BIT |
74 IIO_CHAN_INFO_SCALE_SHARED_BIT |
75 IIO_CHAN_INFO_SAMP_FREQ_SHARED_BIT |
76 IIO_CHAN_INFO_HYSTERESIS_SHARED_BIT,
77 .scan_index = CHANNEL_SCAN_INDEX_Y,
81 .channel2 = IIO_MOD_Z,
82 .info_mask = IIO_CHAN_INFO_OFFSET_SHARED_BIT |
83 IIO_CHAN_INFO_SCALE_SHARED_BIT |
84 IIO_CHAN_INFO_SAMP_FREQ_SHARED_BIT |
85 IIO_CHAN_INFO_HYSTERESIS_SHARED_BIT,
86 .scan_index = CHANNEL_SCAN_INDEX_Z,
90 /* Adjust channel real bits based on report descriptor */
91 static void gyro_3d_adjust_channel_bit_mask(struct iio_chan_spec *channels,
92 int channel, int size)
94 channels[channel].scan_type.sign = 's';
95 /* Real storage bits will change based on the report desc. */
96 channels[channel].scan_type.realbits = size * 8;
97 /* Maximum size of a sample to capture is u32 */
98 channels[channel].scan_type.storagebits = sizeof(u32) * 8;
101 /* Channel read_raw handler */
102 static int gyro_3d_read_raw(struct iio_dev *indio_dev,
103 struct iio_chan_spec const *chan,
107 struct gyro_3d_state *gyro_state = iio_priv(indio_dev);
117 report_id = gyro_state->gyro[chan->scan_index].report_id;
118 address = gyro_3d_addresses[chan->scan_index];
120 *val = sensor_hub_input_attr_get_raw_value(
121 gyro_state->common_attributes.hsdev,
122 HID_USAGE_SENSOR_GYRO_3D, address,
128 ret_type = IIO_VAL_INT;
130 case IIO_CHAN_INFO_SCALE:
131 *val = gyro_state->gyro[CHANNEL_SCAN_INDEX_X].units;
132 ret_type = IIO_VAL_INT;
134 case IIO_CHAN_INFO_OFFSET:
135 *val = hid_sensor_convert_exponent(
136 gyro_state->gyro[CHANNEL_SCAN_INDEX_X].unit_expo);
137 ret_type = IIO_VAL_INT;
139 case IIO_CHAN_INFO_SAMP_FREQ:
140 ret = hid_sensor_read_samp_freq_value(
141 &gyro_state->common_attributes, val, val2);
142 ret_type = IIO_VAL_INT_PLUS_MICRO;
144 case IIO_CHAN_INFO_HYSTERESIS:
145 ret = hid_sensor_read_raw_hyst_value(
146 &gyro_state->common_attributes, val, val2);
147 ret_type = IIO_VAL_INT_PLUS_MICRO;
157 /* Channel write_raw handler */
158 static int gyro_3d_write_raw(struct iio_dev *indio_dev,
159 struct iio_chan_spec const *chan,
164 struct gyro_3d_state *gyro_state = iio_priv(indio_dev);
168 case IIO_CHAN_INFO_SAMP_FREQ:
169 ret = hid_sensor_write_samp_freq_value(
170 &gyro_state->common_attributes, val, val2);
172 case IIO_CHAN_INFO_HYSTERESIS:
173 ret = hid_sensor_write_raw_hyst_value(
174 &gyro_state->common_attributes, val, val2);
183 static int gyro_3d_write_raw_get_fmt(struct iio_dev *indio_dev,
184 struct iio_chan_spec const *chan,
187 return IIO_VAL_INT_PLUS_MICRO;
190 static const struct iio_info gyro_3d_info = {
191 .driver_module = THIS_MODULE,
192 .read_raw = &gyro_3d_read_raw,
193 .write_raw = &gyro_3d_write_raw,
194 .write_raw_get_fmt = &gyro_3d_write_raw_get_fmt,
197 /* Function to push data to buffer */
198 static void hid_sensor_push_data(struct iio_dev *indio_dev, u8 *data, int len)
200 struct iio_buffer *buffer = indio_dev->buffer;
203 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
205 dev_err(&indio_dev->dev, "Buffer == NULL\n");
208 datum_sz = buffer->access->get_bytes_per_datum(buffer);
209 if (len > datum_sz) {
210 dev_err(&indio_dev->dev, "Datum size mismatch %d:%d\n", len,
214 iio_push_to_buffer(buffer, (u8 *)data);
217 /* Callback handler to send event after all samples are received and captured */
218 static int gyro_3d_proc_event(struct hid_sensor_hub_device *hsdev,
222 struct iio_dev *indio_dev = platform_get_drvdata(priv);
223 struct gyro_3d_state *gyro_state = iio_priv(indio_dev);
225 dev_dbg(&indio_dev->dev, "gyro_3d_proc_event [%d]\n",
226 gyro_state->common_attributes.data_ready);
227 if (gyro_state->common_attributes.data_ready)
228 hid_sensor_push_data(indio_dev,
229 (u8 *)gyro_state->gyro_val,
230 sizeof(gyro_state->gyro_val));
235 /* Capture samples in local storage */
236 static int gyro_3d_capture_sample(struct hid_sensor_hub_device *hsdev,
238 size_t raw_len, char *raw_data,
241 struct iio_dev *indio_dev = platform_get_drvdata(priv);
242 struct gyro_3d_state *gyro_state = iio_priv(indio_dev);
247 case HID_USAGE_SENSOR_ANGL_VELOCITY_X_AXIS:
248 case HID_USAGE_SENSOR_ANGL_VELOCITY_Y_AXIS:
249 case HID_USAGE_SENSOR_ANGL_VELOCITY_Z_AXIS:
250 offset = usage_id - HID_USAGE_SENSOR_ANGL_VELOCITY_X_AXIS;
251 gyro_state->gyro_val[CHANNEL_SCAN_INDEX_X + offset] =
262 /* Parse report which is specific to an usage id*/
263 static int gyro_3d_parse_report(struct platform_device *pdev,
264 struct hid_sensor_hub_device *hsdev,
265 struct iio_chan_spec *channels,
267 struct gyro_3d_state *st)
272 for (i = 0; i <= CHANNEL_SCAN_INDEX_Z; ++i) {
273 ret = sensor_hub_input_get_attribute_info(hsdev,
276 HID_USAGE_SENSOR_ANGL_VELOCITY_X_AXIS + i,
277 &st->gyro[CHANNEL_SCAN_INDEX_X + i]);
280 gyro_3d_adjust_channel_bit_mask(channels,
281 CHANNEL_SCAN_INDEX_X + i,
282 st->gyro[CHANNEL_SCAN_INDEX_X + i].size);
284 dev_dbg(&pdev->dev, "gyro_3d %x:%x, %x:%x, %x:%x\n",
286 st->gyro[0].report_id,
287 st->gyro[1].index, st->gyro[1].report_id,
288 st->gyro[2].index, st->gyro[2].report_id);
293 /* Function to initialize the processing for usage id */
294 static int __devinit hid_gyro_3d_probe(struct platform_device *pdev)
297 static const char *name = "gyro_3d";
298 struct iio_dev *indio_dev;
299 struct gyro_3d_state *gyro_state;
300 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
301 struct iio_chan_spec *channels;
303 indio_dev = iio_device_alloc(sizeof(struct gyro_3d_state));
304 if (indio_dev == NULL) {
308 platform_set_drvdata(pdev, indio_dev);
310 gyro_state = iio_priv(indio_dev);
311 gyro_state->common_attributes.hsdev = hsdev;
312 gyro_state->common_attributes.pdev = pdev;
314 ret = hid_sensor_parse_common_attributes(hsdev,
315 HID_USAGE_SENSOR_GYRO_3D,
316 &gyro_state->common_attributes);
318 dev_err(&pdev->dev, "failed to setup common attributes\n");
322 channels = kmemdup(gyro_3d_channels,
323 sizeof(gyro_3d_channels),
326 dev_err(&pdev->dev, "failed to duplicate channels\n");
330 ret = gyro_3d_parse_report(pdev, hsdev, channels,
331 HID_USAGE_SENSOR_GYRO_3D, gyro_state);
333 dev_err(&pdev->dev, "failed to setup attributes\n");
334 goto error_free_dev_mem;
337 indio_dev->channels = channels;
338 indio_dev->num_channels = ARRAY_SIZE(gyro_3d_channels);
339 indio_dev->dev.parent = &pdev->dev;
340 indio_dev->info = &gyro_3d_info;
341 indio_dev->name = name;
342 indio_dev->modes = INDIO_DIRECT_MODE;
344 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
347 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
348 goto error_free_dev_mem;
350 gyro_state->common_attributes.data_ready = false;
351 ret = hid_sensor_setup_trigger(indio_dev, name,
352 &gyro_state->common_attributes);
354 dev_err(&pdev->dev, "trigger setup failed\n");
355 goto error_unreg_buffer_funcs;
358 ret = iio_device_register(indio_dev);
360 dev_err(&pdev->dev, "device register failed\n");
361 goto error_remove_trigger;
364 gyro_state->callbacks.send_event = gyro_3d_proc_event;
365 gyro_state->callbacks.capture_sample = gyro_3d_capture_sample;
366 gyro_state->callbacks.pdev = pdev;
367 ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_GYRO_3D,
368 &gyro_state->callbacks);
370 dev_err(&pdev->dev, "callback reg failed\n");
371 goto error_iio_unreg;
377 iio_device_unregister(indio_dev);
378 error_remove_trigger:
379 hid_sensor_remove_trigger(indio_dev);
380 error_unreg_buffer_funcs:
381 iio_triggered_buffer_cleanup(indio_dev);
383 kfree(indio_dev->channels);
385 iio_device_free(indio_dev);
390 /* Function to deinitialize the processing for usage id */
391 static int __devinit hid_gyro_3d_remove(struct platform_device *pdev)
393 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
394 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
396 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_GYRO_3D);
397 iio_device_unregister(indio_dev);
398 hid_sensor_remove_trigger(indio_dev);
399 iio_triggered_buffer_cleanup(indio_dev);
400 kfree(indio_dev->channels);
401 iio_device_free(indio_dev);
406 static struct platform_driver hid_gyro_3d_platform_driver = {
409 .owner = THIS_MODULE,
411 .probe = hid_gyro_3d_probe,
412 .remove = hid_gyro_3d_remove,
414 module_platform_driver(hid_gyro_3d_platform_driver);
416 MODULE_DESCRIPTION("HID Sensor Gyroscope 3D");
417 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
418 MODULE_LICENSE("GPL");