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 #define CHANNEL_SCAN_INDEX_ILLUM 0
36 struct hid_sensor_hub_callbacks callbacks
;
37 struct hid_sensor_common common_attributes
;
38 struct hid_sensor_hub_attribute_info als_illum
;
42 /* Channel definitions */
43 static const struct iio_chan_spec als_channels
[] = {
45 .type
= IIO_INTENSITY
,
47 .channel2
= IIO_MOD_LIGHT_BOTH
,
48 .info_mask_shared_by_type
= BIT(IIO_CHAN_INFO_OFFSET
) |
49 BIT(IIO_CHAN_INFO_SCALE
) |
50 BIT(IIO_CHAN_INFO_SAMP_FREQ
) |
51 BIT(IIO_CHAN_INFO_HYSTERESIS
),
52 .scan_index
= CHANNEL_SCAN_INDEX_ILLUM
,
56 /* Adjust channel real bits based on report descriptor */
57 static void als_adjust_channel_bit_mask(struct iio_chan_spec
*channels
,
58 int channel
, int size
)
60 channels
[channel
].scan_type
.sign
= 's';
61 /* Real storage bits will change based on the report desc. */
62 channels
[channel
].scan_type
.realbits
= size
* 8;
63 /* Maximum size of a sample to capture is u32 */
64 channels
[channel
].scan_type
.storagebits
= sizeof(u32
) * 8;
67 /* Channel read_raw handler */
68 static int als_read_raw(struct iio_dev
*indio_dev
,
69 struct iio_chan_spec
const *chan
,
73 struct als_state
*als_state
= iio_priv(indio_dev
);
83 switch (chan
->scan_index
) {
84 case CHANNEL_SCAN_INDEX_ILLUM
:
85 report_id
= als_state
->als_illum
.report_id
;
87 HID_USAGE_SENSOR_LIGHT_ILLUM
;
94 *val
= sensor_hub_input_attr_get_raw_value(
95 als_state
->common_attributes
.hsdev
,
96 HID_USAGE_SENSOR_ALS
, address
,
102 ret_type
= IIO_VAL_INT
;
104 case IIO_CHAN_INFO_SCALE
:
105 *val
= als_state
->als_illum
.units
;
106 ret_type
= IIO_VAL_INT
;
108 case IIO_CHAN_INFO_OFFSET
:
109 *val
= hid_sensor_convert_exponent(
110 als_state
->als_illum
.unit_expo
);
111 ret_type
= IIO_VAL_INT
;
113 case IIO_CHAN_INFO_SAMP_FREQ
:
114 ret
= hid_sensor_read_samp_freq_value(
115 &als_state
->common_attributes
, val
, val2
);
116 ret_type
= IIO_VAL_INT_PLUS_MICRO
;
118 case IIO_CHAN_INFO_HYSTERESIS
:
119 ret
= hid_sensor_read_raw_hyst_value(
120 &als_state
->common_attributes
, val
, val2
);
121 ret_type
= IIO_VAL_INT_PLUS_MICRO
;
131 /* Channel write_raw handler */
132 static int als_write_raw(struct iio_dev
*indio_dev
,
133 struct iio_chan_spec
const *chan
,
138 struct als_state
*als_state
= iio_priv(indio_dev
);
142 case IIO_CHAN_INFO_SAMP_FREQ
:
143 ret
= hid_sensor_write_samp_freq_value(
144 &als_state
->common_attributes
, val
, val2
);
146 case IIO_CHAN_INFO_HYSTERESIS
:
147 ret
= hid_sensor_write_raw_hyst_value(
148 &als_state
->common_attributes
, val
, val2
);
157 static const struct iio_info als_info
= {
158 .driver_module
= THIS_MODULE
,
159 .read_raw
= &als_read_raw
,
160 .write_raw
= &als_write_raw
,
163 /* Function to push data to buffer */
164 static void hid_sensor_push_data(struct iio_dev
*indio_dev
, u8
*data
, int len
)
166 dev_dbg(&indio_dev
->dev
, "hid_sensor_push_data\n");
167 iio_push_to_buffers(indio_dev
, (u8
*)data
);
170 /* Callback handler to send event after all samples are received and captured */
171 static int als_proc_event(struct hid_sensor_hub_device
*hsdev
,
175 struct iio_dev
*indio_dev
= platform_get_drvdata(priv
);
176 struct als_state
*als_state
= iio_priv(indio_dev
);
178 dev_dbg(&indio_dev
->dev
, "als_proc_event [%d]\n",
179 als_state
->common_attributes
.data_ready
);
180 if (als_state
->common_attributes
.data_ready
)
181 hid_sensor_push_data(indio_dev
,
182 (u8
*)&als_state
->illum
,
183 sizeof(als_state
->illum
));
188 /* Capture samples in local storage */
189 static int als_capture_sample(struct hid_sensor_hub_device
*hsdev
,
191 size_t raw_len
, char *raw_data
,
194 struct iio_dev
*indio_dev
= platform_get_drvdata(priv
);
195 struct als_state
*als_state
= iio_priv(indio_dev
);
199 case HID_USAGE_SENSOR_LIGHT_ILLUM
:
200 als_state
->illum
= *(u32
*)raw_data
;
210 /* Parse report which is specific to an usage id*/
211 static int als_parse_report(struct platform_device
*pdev
,
212 struct hid_sensor_hub_device
*hsdev
,
213 struct iio_chan_spec
*channels
,
215 struct als_state
*st
)
219 ret
= sensor_hub_input_get_attribute_info(hsdev
, HID_INPUT_REPORT
,
221 HID_USAGE_SENSOR_LIGHT_ILLUM
,
225 als_adjust_channel_bit_mask(channels
, CHANNEL_SCAN_INDEX_ILLUM
,
228 dev_dbg(&pdev
->dev
, "als %x:%x\n", st
->als_illum
.index
,
229 st
->als_illum
.report_id
);
234 /* Function to initialize the processing for usage id */
235 static int hid_als_probe(struct platform_device
*pdev
)
238 static const char *name
= "als";
239 struct iio_dev
*indio_dev
;
240 struct als_state
*als_state
;
241 struct hid_sensor_hub_device
*hsdev
= pdev
->dev
.platform_data
;
242 struct iio_chan_spec
*channels
;
244 indio_dev
= devm_iio_device_alloc(&pdev
->dev
, sizeof(struct als_state
));
247 platform_set_drvdata(pdev
, indio_dev
);
249 als_state
= iio_priv(indio_dev
);
250 als_state
->common_attributes
.hsdev
= hsdev
;
251 als_state
->common_attributes
.pdev
= pdev
;
253 ret
= hid_sensor_parse_common_attributes(hsdev
, HID_USAGE_SENSOR_ALS
,
254 &als_state
->common_attributes
);
256 dev_err(&pdev
->dev
, "failed to setup common attributes\n");
260 channels
= kmemdup(als_channels
, sizeof(als_channels
), GFP_KERNEL
);
262 dev_err(&pdev
->dev
, "failed to duplicate channels\n");
266 ret
= als_parse_report(pdev
, hsdev
, channels
,
267 HID_USAGE_SENSOR_ALS
, als_state
);
269 dev_err(&pdev
->dev
, "failed to setup attributes\n");
270 goto error_free_dev_mem
;
273 indio_dev
->channels
= channels
;
274 indio_dev
->num_channels
=
275 ARRAY_SIZE(als_channels
);
276 indio_dev
->dev
.parent
= &pdev
->dev
;
277 indio_dev
->info
= &als_info
;
278 indio_dev
->name
= name
;
279 indio_dev
->modes
= INDIO_DIRECT_MODE
;
281 ret
= iio_triggered_buffer_setup(indio_dev
, &iio_pollfunc_store_time
,
284 dev_err(&pdev
->dev
, "failed to initialize trigger buffer\n");
285 goto error_free_dev_mem
;
287 als_state
->common_attributes
.data_ready
= false;
288 ret
= hid_sensor_setup_trigger(indio_dev
, name
,
289 &als_state
->common_attributes
);
291 dev_err(&pdev
->dev
, "trigger setup failed\n");
292 goto error_unreg_buffer_funcs
;
295 ret
= iio_device_register(indio_dev
);
297 dev_err(&pdev
->dev
, "device register failed\n");
298 goto error_remove_trigger
;
301 als_state
->callbacks
.send_event
= als_proc_event
;
302 als_state
->callbacks
.capture_sample
= als_capture_sample
;
303 als_state
->callbacks
.pdev
= pdev
;
304 ret
= sensor_hub_register_callback(hsdev
, HID_USAGE_SENSOR_ALS
,
305 &als_state
->callbacks
);
307 dev_err(&pdev
->dev
, "callback reg failed\n");
308 goto error_iio_unreg
;
314 iio_device_unregister(indio_dev
);
315 error_remove_trigger
:
316 hid_sensor_remove_trigger(indio_dev
);
317 error_unreg_buffer_funcs
:
318 iio_triggered_buffer_cleanup(indio_dev
);
320 kfree(indio_dev
->channels
);
324 /* Function to deinitialize the processing for usage id */
325 static int hid_als_remove(struct platform_device
*pdev
)
327 struct hid_sensor_hub_device
*hsdev
= pdev
->dev
.platform_data
;
328 struct iio_dev
*indio_dev
= platform_get_drvdata(pdev
);
330 sensor_hub_remove_callback(hsdev
, HID_USAGE_SENSOR_ALS
);
331 iio_device_unregister(indio_dev
);
332 hid_sensor_remove_trigger(indio_dev
);
333 iio_triggered_buffer_cleanup(indio_dev
);
334 kfree(indio_dev
->channels
);
339 static struct platform_device_id hid_als_ids
[] = {
341 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
342 .name
= "HID-SENSOR-200041",
346 MODULE_DEVICE_TABLE(platform
, hid_als_ids
);
348 static struct platform_driver hid_als_platform_driver
= {
349 .id_table
= hid_als_ids
,
351 .name
= KBUILD_MODNAME
,
352 .owner
= THIS_MODULE
,
354 .probe
= hid_als_probe
,
355 .remove
= hid_als_remove
,
357 module_platform_driver(hid_als_platform_driver
);
359 MODULE_DESCRIPTION("HID Sensor ALS");
360 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
361 MODULE_LICENSE("GPL");