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/delay.h>
26 #include <linux/hid-sensor-hub.h>
27 #include <linux/iio/iio.h>
28 #include <linux/iio/sysfs.h>
29 #include <linux/iio/buffer.h>
30 #include <linux/iio/trigger_consumer.h>
31 #include <linux/iio/triggered_buffer.h>
32 #include "../common/hid-sensors/hid-sensor-trigger.h"
34 enum gyro_3d_channel
{
41 struct gyro_3d_state
{
42 struct hid_sensor_hub_callbacks callbacks
;
43 struct hid_sensor_common common_attributes
;
44 struct hid_sensor_hub_attribute_info gyro
[GYRO_3D_CHANNEL_MAX
];
45 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_separate
= BIT(IIO_CHAN_INFO_RAW
),
65 .info_mask_shared_by_type
= BIT(IIO_CHAN_INFO_OFFSET
) |
66 BIT(IIO_CHAN_INFO_SCALE
) |
67 BIT(IIO_CHAN_INFO_SAMP_FREQ
) |
68 BIT(IIO_CHAN_INFO_HYSTERESIS
),
69 .scan_index
= CHANNEL_SCAN_INDEX_X
,
73 .channel2
= IIO_MOD_Y
,
74 .info_mask_separate
= BIT(IIO_CHAN_INFO_RAW
),
75 .info_mask_shared_by_type
= BIT(IIO_CHAN_INFO_OFFSET
) |
76 BIT(IIO_CHAN_INFO_SCALE
) |
77 BIT(IIO_CHAN_INFO_SAMP_FREQ
) |
78 BIT(IIO_CHAN_INFO_HYSTERESIS
),
79 .scan_index
= CHANNEL_SCAN_INDEX_Y
,
83 .channel2
= IIO_MOD_Z
,
84 .info_mask_separate
= BIT(IIO_CHAN_INFO_RAW
),
85 .info_mask_shared_by_type
= BIT(IIO_CHAN_INFO_OFFSET
) |
86 BIT(IIO_CHAN_INFO_SCALE
) |
87 BIT(IIO_CHAN_INFO_SAMP_FREQ
) |
88 BIT(IIO_CHAN_INFO_HYSTERESIS
),
89 .scan_index
= CHANNEL_SCAN_INDEX_Z
,
93 /* Adjust channel real bits based on report descriptor */
94 static void gyro_3d_adjust_channel_bit_mask(struct iio_chan_spec
*channels
,
95 int channel
, int size
)
97 channels
[channel
].scan_type
.sign
= 's';
98 /* Real storage bits will change based on the report desc. */
99 channels
[channel
].scan_type
.realbits
= size
* 8;
100 /* Maximum size of a sample to capture is u32 */
101 channels
[channel
].scan_type
.storagebits
= sizeof(u32
) * 8;
104 /* Channel read_raw handler */
105 static int gyro_3d_read_raw(struct iio_dev
*indio_dev
,
106 struct iio_chan_spec
const *chan
,
110 struct gyro_3d_state
*gyro_state
= iio_priv(indio_dev
);
121 poll_value
= hid_sensor_read_poll_value(
122 &gyro_state
->common_attributes
);
126 hid_sensor_power_state(&gyro_state
->common_attributes
, true);
127 msleep_interruptible(poll_value
* 2);
128 report_id
= gyro_state
->gyro
[chan
->scan_index
].report_id
;
129 address
= gyro_3d_addresses
[chan
->scan_index
];
131 *val
= sensor_hub_input_attr_get_raw_value(
132 gyro_state
->common_attributes
.hsdev
,
133 HID_USAGE_SENSOR_GYRO_3D
, address
,
137 hid_sensor_power_state(&gyro_state
->common_attributes
,
141 hid_sensor_power_state(&gyro_state
->common_attributes
, false);
142 ret_type
= IIO_VAL_INT
;
144 case IIO_CHAN_INFO_SCALE
:
145 *val
= gyro_state
->scale_pre_decml
;
146 *val2
= gyro_state
->scale_post_decml
;
147 ret_type
= gyro_state
->scale_precision
;
149 case IIO_CHAN_INFO_OFFSET
:
150 *val
= gyro_state
->value_offset
;
151 ret_type
= IIO_VAL_INT
;
153 case IIO_CHAN_INFO_SAMP_FREQ
:
154 ret
= hid_sensor_read_samp_freq_value(
155 &gyro_state
->common_attributes
, val
, val2
);
156 ret_type
= IIO_VAL_INT_PLUS_MICRO
;
158 case IIO_CHAN_INFO_HYSTERESIS
:
159 ret
= hid_sensor_read_raw_hyst_value(
160 &gyro_state
->common_attributes
, val
, val2
);
161 ret_type
= IIO_VAL_INT_PLUS_MICRO
;
171 /* Channel write_raw handler */
172 static int gyro_3d_write_raw(struct iio_dev
*indio_dev
,
173 struct iio_chan_spec
const *chan
,
178 struct gyro_3d_state
*gyro_state
= iio_priv(indio_dev
);
182 case IIO_CHAN_INFO_SAMP_FREQ
:
183 ret
= hid_sensor_write_samp_freq_value(
184 &gyro_state
->common_attributes
, val
, val2
);
186 case IIO_CHAN_INFO_HYSTERESIS
:
187 ret
= hid_sensor_write_raw_hyst_value(
188 &gyro_state
->common_attributes
, val
, val2
);
197 static const struct iio_info gyro_3d_info
= {
198 .driver_module
= THIS_MODULE
,
199 .read_raw
= &gyro_3d_read_raw
,
200 .write_raw
= &gyro_3d_write_raw
,
203 /* Function to push data to buffer */
204 static void hid_sensor_push_data(struct iio_dev
*indio_dev
, const void *data
,
207 dev_dbg(&indio_dev
->dev
, "hid_sensor_push_data\n");
208 iio_push_to_buffers(indio_dev
, data
);
211 /* Callback handler to send event after all samples are received and captured */
212 static int gyro_3d_proc_event(struct hid_sensor_hub_device
*hsdev
,
216 struct iio_dev
*indio_dev
= platform_get_drvdata(priv
);
217 struct gyro_3d_state
*gyro_state
= iio_priv(indio_dev
);
219 dev_dbg(&indio_dev
->dev
, "gyro_3d_proc_event\n");
220 if (atomic_read(&gyro_state
->common_attributes
.data_ready
))
221 hid_sensor_push_data(indio_dev
,
222 gyro_state
->gyro_val
,
223 sizeof(gyro_state
->gyro_val
));
228 /* Capture samples in local storage */
229 static int gyro_3d_capture_sample(struct hid_sensor_hub_device
*hsdev
,
231 size_t raw_len
, char *raw_data
,
234 struct iio_dev
*indio_dev
= platform_get_drvdata(priv
);
235 struct gyro_3d_state
*gyro_state
= iio_priv(indio_dev
);
240 case HID_USAGE_SENSOR_ANGL_VELOCITY_X_AXIS
:
241 case HID_USAGE_SENSOR_ANGL_VELOCITY_Y_AXIS
:
242 case HID_USAGE_SENSOR_ANGL_VELOCITY_Z_AXIS
:
243 offset
= usage_id
- HID_USAGE_SENSOR_ANGL_VELOCITY_X_AXIS
;
244 gyro_state
->gyro_val
[CHANNEL_SCAN_INDEX_X
+ offset
] =
255 /* Parse report which is specific to an usage id*/
256 static int gyro_3d_parse_report(struct platform_device
*pdev
,
257 struct hid_sensor_hub_device
*hsdev
,
258 struct iio_chan_spec
*channels
,
260 struct gyro_3d_state
*st
)
265 for (i
= 0; i
<= CHANNEL_SCAN_INDEX_Z
; ++i
) {
266 ret
= sensor_hub_input_get_attribute_info(hsdev
,
269 HID_USAGE_SENSOR_ANGL_VELOCITY_X_AXIS
+ i
,
270 &st
->gyro
[CHANNEL_SCAN_INDEX_X
+ i
]);
273 gyro_3d_adjust_channel_bit_mask(channels
,
274 CHANNEL_SCAN_INDEX_X
+ i
,
275 st
->gyro
[CHANNEL_SCAN_INDEX_X
+ i
].size
);
277 dev_dbg(&pdev
->dev
, "gyro_3d %x:%x, %x:%x, %x:%x\n",
279 st
->gyro
[0].report_id
,
280 st
->gyro
[1].index
, st
->gyro
[1].report_id
,
281 st
->gyro
[2].index
, st
->gyro
[2].report_id
);
283 st
->scale_precision
= hid_sensor_format_scale(
284 HID_USAGE_SENSOR_GYRO_3D
,
285 &st
->gyro
[CHANNEL_SCAN_INDEX_X
],
286 &st
->scale_pre_decml
, &st
->scale_post_decml
);
288 /* Set Sensitivity field ids, when there is no individual modifier */
289 if (st
->common_attributes
.sensitivity
.index
< 0) {
290 sensor_hub_input_get_attribute_info(hsdev
,
291 HID_FEATURE_REPORT
, usage_id
,
292 HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS
|
293 HID_USAGE_SENSOR_DATA_ANGL_VELOCITY
,
294 &st
->common_attributes
.sensitivity
);
295 dev_dbg(&pdev
->dev
, "Sensitivity index:report %d:%d\n",
296 st
->common_attributes
.sensitivity
.index
,
297 st
->common_attributes
.sensitivity
.report_id
);
302 /* Function to initialize the processing for usage id */
303 static int hid_gyro_3d_probe(struct platform_device
*pdev
)
306 static const char *name
= "gyro_3d";
307 struct iio_dev
*indio_dev
;
308 struct gyro_3d_state
*gyro_state
;
309 struct hid_sensor_hub_device
*hsdev
= pdev
->dev
.platform_data
;
310 struct iio_chan_spec
*channels
;
312 indio_dev
= devm_iio_device_alloc(&pdev
->dev
, sizeof(*gyro_state
));
315 platform_set_drvdata(pdev
, indio_dev
);
317 gyro_state
= iio_priv(indio_dev
);
318 gyro_state
->common_attributes
.hsdev
= hsdev
;
319 gyro_state
->common_attributes
.pdev
= pdev
;
321 ret
= hid_sensor_parse_common_attributes(hsdev
,
322 HID_USAGE_SENSOR_GYRO_3D
,
323 &gyro_state
->common_attributes
);
325 dev_err(&pdev
->dev
, "failed to setup common attributes\n");
329 channels
= kmemdup(gyro_3d_channels
, sizeof(gyro_3d_channels
),
332 dev_err(&pdev
->dev
, "failed to duplicate channels\n");
336 ret
= gyro_3d_parse_report(pdev
, hsdev
, channels
,
337 HID_USAGE_SENSOR_GYRO_3D
, gyro_state
);
339 dev_err(&pdev
->dev
, "failed to setup attributes\n");
340 goto error_free_dev_mem
;
343 indio_dev
->channels
= channels
;
344 indio_dev
->num_channels
= ARRAY_SIZE(gyro_3d_channels
);
345 indio_dev
->dev
.parent
= &pdev
->dev
;
346 indio_dev
->info
= &gyro_3d_info
;
347 indio_dev
->name
= name
;
348 indio_dev
->modes
= INDIO_DIRECT_MODE
;
350 ret
= iio_triggered_buffer_setup(indio_dev
, &iio_pollfunc_store_time
,
353 dev_err(&pdev
->dev
, "failed to initialize trigger buffer\n");
354 goto error_free_dev_mem
;
356 atomic_set(&gyro_state
->common_attributes
.data_ready
, 0);
357 ret
= hid_sensor_setup_trigger(indio_dev
, name
,
358 &gyro_state
->common_attributes
);
360 dev_err(&pdev
->dev
, "trigger setup failed\n");
361 goto error_unreg_buffer_funcs
;
364 ret
= iio_device_register(indio_dev
);
366 dev_err(&pdev
->dev
, "device register failed\n");
367 goto error_remove_trigger
;
370 gyro_state
->callbacks
.send_event
= gyro_3d_proc_event
;
371 gyro_state
->callbacks
.capture_sample
= gyro_3d_capture_sample
;
372 gyro_state
->callbacks
.pdev
= pdev
;
373 ret
= sensor_hub_register_callback(hsdev
, HID_USAGE_SENSOR_GYRO_3D
,
374 &gyro_state
->callbacks
);
376 dev_err(&pdev
->dev
, "callback reg failed\n");
377 goto error_iio_unreg
;
383 iio_device_unregister(indio_dev
);
384 error_remove_trigger
:
385 hid_sensor_remove_trigger(&gyro_state
->common_attributes
);
386 error_unreg_buffer_funcs
:
387 iio_triggered_buffer_cleanup(indio_dev
);
389 kfree(indio_dev
->channels
);
393 /* Function to deinitialize the processing for usage id */
394 static int hid_gyro_3d_remove(struct platform_device
*pdev
)
396 struct hid_sensor_hub_device
*hsdev
= pdev
->dev
.platform_data
;
397 struct iio_dev
*indio_dev
= platform_get_drvdata(pdev
);
398 struct gyro_3d_state
*gyro_state
= iio_priv(indio_dev
);
400 sensor_hub_remove_callback(hsdev
, HID_USAGE_SENSOR_GYRO_3D
);
401 iio_device_unregister(indio_dev
);
402 hid_sensor_remove_trigger(&gyro_state
->common_attributes
);
403 iio_triggered_buffer_cleanup(indio_dev
);
404 kfree(indio_dev
->channels
);
409 static struct platform_device_id hid_gyro_3d_ids
[] = {
411 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
412 .name
= "HID-SENSOR-200076",
416 MODULE_DEVICE_TABLE(platform
, hid_gyro_3d_ids
);
418 static struct platform_driver hid_gyro_3d_platform_driver
= {
419 .id_table
= hid_gyro_3d_ids
,
421 .name
= KBUILD_MODNAME
,
422 .owner
= THIS_MODULE
,
424 .probe
= hid_gyro_3d_probe
,
425 .remove
= hid_gyro_3d_remove
,
427 module_platform_driver(hid_gyro_3d_platform_driver
);
429 MODULE_DESCRIPTION("HID Sensor Gyroscope 3D");
430 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
431 MODULE_LICENSE("GPL");