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 accel_3d_channel {
41 struct accel_3d_state {
42 struct hid_sensor_hub_callbacks callbacks;
43 struct hid_sensor_common common_attributes;
44 struct hid_sensor_hub_attribute_info accel[ACCEL_3D_CHANNEL_MAX];
45 u32 accel_val[ACCEL_3D_CHANNEL_MAX];
52 static const u32 accel_3d_addresses[ACCEL_3D_CHANNEL_MAX] = {
53 HID_USAGE_SENSOR_ACCEL_X_AXIS,
54 HID_USAGE_SENSOR_ACCEL_Y_AXIS,
55 HID_USAGE_SENSOR_ACCEL_Z_AXIS
58 /* Channel definitions */
59 static const struct iio_chan_spec accel_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 accel_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 accel_3d_read_raw(struct iio_dev *indio_dev,
106 struct iio_chan_spec const *chan,
110 struct accel_3d_state *accel_state = iio_priv(indio_dev);
120 poll_value = hid_sensor_read_poll_value(
121 &accel_state->common_attributes);
125 hid_sensor_power_state(&accel_state->common_attributes, true);
126 msleep_interruptible(poll_value * 2);
127 report_id = accel_state->accel[chan->scan_index].report_id;
128 address = accel_3d_addresses[chan->scan_index];
130 *val = sensor_hub_input_attr_get_raw_value(
131 accel_state->common_attributes.hsdev,
132 HID_USAGE_SENSOR_ACCEL_3D, address,
136 hid_sensor_power_state(&accel_state->common_attributes,
140 hid_sensor_power_state(&accel_state->common_attributes, false);
141 ret_type = IIO_VAL_INT;
143 case IIO_CHAN_INFO_SCALE:
144 *val = accel_state->scale_pre_decml;
145 *val2 = accel_state->scale_post_decml;
146 ret_type = accel_state->scale_precision;
148 case IIO_CHAN_INFO_OFFSET:
149 *val = accel_state->value_offset;
150 ret_type = IIO_VAL_INT;
152 case IIO_CHAN_INFO_SAMP_FREQ:
153 ret_type = hid_sensor_read_samp_freq_value(
154 &accel_state->common_attributes, val, val2);
156 case IIO_CHAN_INFO_HYSTERESIS:
157 ret_type = hid_sensor_read_raw_hyst_value(
158 &accel_state->common_attributes, val, val2);
168 /* Channel write_raw handler */
169 static int accel_3d_write_raw(struct iio_dev *indio_dev,
170 struct iio_chan_spec const *chan,
175 struct accel_3d_state *accel_state = iio_priv(indio_dev);
179 case IIO_CHAN_INFO_SAMP_FREQ:
180 ret = hid_sensor_write_samp_freq_value(
181 &accel_state->common_attributes, val, val2);
183 case IIO_CHAN_INFO_HYSTERESIS:
184 ret = hid_sensor_write_raw_hyst_value(
185 &accel_state->common_attributes, val, val2);
194 static const struct iio_info accel_3d_info = {
195 .driver_module = THIS_MODULE,
196 .read_raw = &accel_3d_read_raw,
197 .write_raw = &accel_3d_write_raw,
200 /* Function to push data to buffer */
201 static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
204 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
205 iio_push_to_buffers(indio_dev, data);
208 /* Callback handler to send event after all samples are received and captured */
209 static int accel_3d_proc_event(struct hid_sensor_hub_device *hsdev,
213 struct iio_dev *indio_dev = platform_get_drvdata(priv);
214 struct accel_3d_state *accel_state = iio_priv(indio_dev);
216 dev_dbg(&indio_dev->dev, "accel_3d_proc_event\n");
217 if (atomic_read(&accel_state->common_attributes.data_ready))
218 hid_sensor_push_data(indio_dev,
219 accel_state->accel_val,
220 sizeof(accel_state->accel_val));
225 /* Capture samples in local storage */
226 static int accel_3d_capture_sample(struct hid_sensor_hub_device *hsdev,
228 size_t raw_len, char *raw_data,
231 struct iio_dev *indio_dev = platform_get_drvdata(priv);
232 struct accel_3d_state *accel_state = iio_priv(indio_dev);
237 case HID_USAGE_SENSOR_ACCEL_X_AXIS:
238 case HID_USAGE_SENSOR_ACCEL_Y_AXIS:
239 case HID_USAGE_SENSOR_ACCEL_Z_AXIS:
240 offset = usage_id - HID_USAGE_SENSOR_ACCEL_X_AXIS;
241 accel_state->accel_val[CHANNEL_SCAN_INDEX_X + offset] =
252 /* Parse report which is specific to an usage id*/
253 static int accel_3d_parse_report(struct platform_device *pdev,
254 struct hid_sensor_hub_device *hsdev,
255 struct iio_chan_spec *channels,
257 struct accel_3d_state *st)
262 for (i = 0; i <= CHANNEL_SCAN_INDEX_Z; ++i) {
263 ret = sensor_hub_input_get_attribute_info(hsdev,
266 HID_USAGE_SENSOR_ACCEL_X_AXIS + i,
267 &st->accel[CHANNEL_SCAN_INDEX_X + i]);
270 accel_3d_adjust_channel_bit_mask(channels,
271 CHANNEL_SCAN_INDEX_X + i,
272 st->accel[CHANNEL_SCAN_INDEX_X + i].size);
274 dev_dbg(&pdev->dev, "accel_3d %x:%x, %x:%x, %x:%x\n",
276 st->accel[0].report_id,
277 st->accel[1].index, st->accel[1].report_id,
278 st->accel[2].index, st->accel[2].report_id);
280 st->scale_precision = hid_sensor_format_scale(
281 HID_USAGE_SENSOR_ACCEL_3D,
282 &st->accel[CHANNEL_SCAN_INDEX_X],
283 &st->scale_pre_decml, &st->scale_post_decml);
285 /* Set Sensitivity field ids, when there is no individual modifier */
286 if (st->common_attributes.sensitivity.index < 0) {
287 sensor_hub_input_get_attribute_info(hsdev,
288 HID_FEATURE_REPORT, usage_id,
289 HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
290 HID_USAGE_SENSOR_DATA_ACCELERATION,
291 &st->common_attributes.sensitivity);
292 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
293 st->common_attributes.sensitivity.index,
294 st->common_attributes.sensitivity.report_id);
300 /* Function to initialize the processing for usage id */
301 static int hid_accel_3d_probe(struct platform_device *pdev)
304 static const char *name = "accel_3d";
305 struct iio_dev *indio_dev;
306 struct accel_3d_state *accel_state;
307 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
308 struct iio_chan_spec *channels;
310 indio_dev = devm_iio_device_alloc(&pdev->dev,
311 sizeof(struct accel_3d_state));
312 if (indio_dev == NULL)
315 platform_set_drvdata(pdev, indio_dev);
317 accel_state = iio_priv(indio_dev);
318 accel_state->common_attributes.hsdev = hsdev;
319 accel_state->common_attributes.pdev = pdev;
321 ret = hid_sensor_parse_common_attributes(hsdev,
322 HID_USAGE_SENSOR_ACCEL_3D,
323 &accel_state->common_attributes);
325 dev_err(&pdev->dev, "failed to setup common attributes\n");
329 channels = kmemdup(accel_3d_channels, sizeof(accel_3d_channels),
332 dev_err(&pdev->dev, "failed to duplicate channels\n");
336 ret = accel_3d_parse_report(pdev, hsdev, channels,
337 HID_USAGE_SENSOR_ACCEL_3D, accel_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(accel_3d_channels);
345 indio_dev->dev.parent = &pdev->dev;
346 indio_dev->info = &accel_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(&accel_state->common_attributes.data_ready, 0);
357 ret = hid_sensor_setup_trigger(indio_dev, name,
358 &accel_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 accel_state->callbacks.send_event = accel_3d_proc_event;
371 accel_state->callbacks.capture_sample = accel_3d_capture_sample;
372 accel_state->callbacks.pdev = pdev;
373 ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ACCEL_3D,
374 &accel_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(&accel_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_accel_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 accel_3d_state *accel_state = iio_priv(indio_dev);
400 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ACCEL_3D);
401 iio_device_unregister(indio_dev);
402 hid_sensor_remove_trigger(&accel_state->common_attributes);
403 iio_triggered_buffer_cleanup(indio_dev);
404 kfree(indio_dev->channels);
409 static struct platform_device_id hid_accel_3d_ids[] = {
411 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
412 .name = "HID-SENSOR-200073",
416 MODULE_DEVICE_TABLE(platform, hid_accel_3d_ids);
418 static struct platform_driver hid_accel_3d_platform_driver = {
419 .id_table = hid_accel_3d_ids,
421 .name = KBUILD_MODNAME,
422 .owner = THIS_MODULE,
424 .probe = hid_accel_3d_probe,
425 .remove = hid_accel_3d_remove,
427 module_platform_driver(hid_accel_3d_platform_driver);
429 MODULE_DESCRIPTION("HID Sensor Accel 3D");
430 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
431 MODULE_LICENSE("GPL");