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39a3a013 AP |
1 | /* |
2 | * HID Sensors Driver | |
3 | * Copyright (c) 2014, Intel Corporation. | |
4 | * | |
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. | |
8 | * | |
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 | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program. | |
16 | * | |
17 | */ | |
18 | #include <linux/device.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/irq.h> | |
23 | #include <linux/slab.h> | |
1eef0620 | 24 | #include <linux/delay.h> |
39a3a013 AP |
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" | |
32 | ||
33 | #define CHANNEL_SCAN_INDEX_PRESENCE 0 | |
34 | ||
35 | struct prox_state { | |
36 | struct hid_sensor_hub_callbacks callbacks; | |
37 | struct hid_sensor_common common_attributes; | |
38 | struct hid_sensor_hub_attribute_info prox_attr; | |
39 | u32 human_presence; | |
40 | }; | |
41 | ||
42 | /* Channel definitions */ | |
43 | static const struct iio_chan_spec prox_channels[] = { | |
44 | { | |
45 | .type = IIO_PROXIMITY, | |
39a3a013 AP |
46 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
47 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | | |
48 | BIT(IIO_CHAN_INFO_SCALE) | | |
49 | BIT(IIO_CHAN_INFO_SAMP_FREQ) | | |
50 | BIT(IIO_CHAN_INFO_HYSTERESIS), | |
51 | .scan_index = CHANNEL_SCAN_INDEX_PRESENCE, | |
52 | } | |
53 | }; | |
54 | ||
55 | /* Adjust channel real bits based on report descriptor */ | |
56 | static void prox_adjust_channel_bit_mask(struct iio_chan_spec *channels, | |
57 | int channel, int size) | |
58 | { | |
59 | channels[channel].scan_type.sign = 's'; | |
60 | /* Real storage bits will change based on the report desc. */ | |
61 | channels[channel].scan_type.realbits = size * 8; | |
62 | /* Maximum size of a sample to capture is u32 */ | |
63 | channels[channel].scan_type.storagebits = sizeof(u32) * 8; | |
64 | } | |
65 | ||
66 | /* Channel read_raw handler */ | |
67 | static int prox_read_raw(struct iio_dev *indio_dev, | |
68 | struct iio_chan_spec const *chan, | |
69 | int *val, int *val2, | |
70 | long mask) | |
71 | { | |
72 | struct prox_state *prox_state = iio_priv(indio_dev); | |
73 | int report_id = -1; | |
74 | u32 address; | |
39a3a013 AP |
75 | int ret_type; |
76 | ||
77 | *val = 0; | |
78 | *val2 = 0; | |
79 | switch (mask) { | |
80 | case IIO_CHAN_INFO_RAW: | |
81 | switch (chan->scan_index) { | |
82 | case CHANNEL_SCAN_INDEX_PRESENCE: | |
83 | report_id = prox_state->prox_attr.report_id; | |
84 | address = | |
85 | HID_USAGE_SENSOR_HUMAN_PRESENCE; | |
86 | break; | |
87 | default: | |
88 | report_id = -1; | |
89 | break; | |
90 | } | |
1eef0620 | 91 | if (report_id >= 0) { |
1eef0620 SP |
92 | hid_sensor_power_state(&prox_state->common_attributes, |
93 | true); | |
39a3a013 AP |
94 | *val = sensor_hub_input_attr_get_raw_value( |
95 | prox_state->common_attributes.hsdev, | |
96 | HID_USAGE_SENSOR_PROX, address, | |
b3f4737d SP |
97 | report_id, |
98 | SENSOR_HUB_SYNC); | |
1eef0620 SP |
99 | hid_sensor_power_state(&prox_state->common_attributes, |
100 | false); | |
101 | } else { | |
39a3a013 AP |
102 | *val = 0; |
103 | return -EINVAL; | |
104 | } | |
105 | ret_type = IIO_VAL_INT; | |
106 | break; | |
107 | case IIO_CHAN_INFO_SCALE: | |
108 | *val = prox_state->prox_attr.units; | |
109 | ret_type = IIO_VAL_INT; | |
110 | break; | |
111 | case IIO_CHAN_INFO_OFFSET: | |
112 | *val = hid_sensor_convert_exponent( | |
113 | prox_state->prox_attr.unit_expo); | |
114 | ret_type = IIO_VAL_INT; | |
115 | break; | |
116 | case IIO_CHAN_INFO_SAMP_FREQ: | |
4ff9f633 | 117 | ret_type = hid_sensor_read_samp_freq_value( |
39a3a013 | 118 | &prox_state->common_attributes, val, val2); |
39a3a013 AP |
119 | break; |
120 | case IIO_CHAN_INFO_HYSTERESIS: | |
4ff9f633 | 121 | ret_type = hid_sensor_read_raw_hyst_value( |
39a3a013 | 122 | &prox_state->common_attributes, val, val2); |
39a3a013 AP |
123 | break; |
124 | default: | |
125 | ret_type = -EINVAL; | |
126 | break; | |
127 | } | |
128 | ||
129 | return ret_type; | |
130 | } | |
131 | ||
132 | /* Channel write_raw handler */ | |
133 | static int prox_write_raw(struct iio_dev *indio_dev, | |
134 | struct iio_chan_spec const *chan, | |
135 | int val, | |
136 | int val2, | |
137 | long mask) | |
138 | { | |
139 | struct prox_state *prox_state = iio_priv(indio_dev); | |
140 | int ret = 0; | |
141 | ||
142 | switch (mask) { | |
143 | case IIO_CHAN_INFO_SAMP_FREQ: | |
144 | ret = hid_sensor_write_samp_freq_value( | |
145 | &prox_state->common_attributes, val, val2); | |
146 | break; | |
147 | case IIO_CHAN_INFO_HYSTERESIS: | |
148 | ret = hid_sensor_write_raw_hyst_value( | |
149 | &prox_state->common_attributes, val, val2); | |
150 | break; | |
151 | default: | |
152 | ret = -EINVAL; | |
153 | } | |
154 | ||
155 | return ret; | |
156 | } | |
157 | ||
158 | static const struct iio_info prox_info = { | |
159 | .driver_module = THIS_MODULE, | |
160 | .read_raw = &prox_read_raw, | |
161 | .write_raw = &prox_write_raw, | |
162 | }; | |
163 | ||
164 | /* Function to push data to buffer */ | |
165 | static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data, | |
166 | int len) | |
167 | { | |
168 | dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); | |
169 | iio_push_to_buffers(indio_dev, data); | |
170 | } | |
171 | ||
172 | /* Callback handler to send event after all samples are received and captured */ | |
173 | static int prox_proc_event(struct hid_sensor_hub_device *hsdev, | |
174 | unsigned usage_id, | |
175 | void *priv) | |
176 | { | |
177 | struct iio_dev *indio_dev = platform_get_drvdata(priv); | |
178 | struct prox_state *prox_state = iio_priv(indio_dev); | |
179 | ||
56ff6be6 SP |
180 | dev_dbg(&indio_dev->dev, "prox_proc_event\n"); |
181 | if (atomic_read(&prox_state->common_attributes.data_ready)) | |
39a3a013 AP |
182 | hid_sensor_push_data(indio_dev, |
183 | &prox_state->human_presence, | |
184 | sizeof(prox_state->human_presence)); | |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
189 | /* Capture samples in local storage */ | |
190 | static int prox_capture_sample(struct hid_sensor_hub_device *hsdev, | |
191 | unsigned usage_id, | |
192 | size_t raw_len, char *raw_data, | |
193 | void *priv) | |
194 | { | |
195 | struct iio_dev *indio_dev = platform_get_drvdata(priv); | |
196 | struct prox_state *prox_state = iio_priv(indio_dev); | |
197 | int ret = -EINVAL; | |
198 | ||
199 | switch (usage_id) { | |
200 | case HID_USAGE_SENSOR_HUMAN_PRESENCE: | |
201 | prox_state->human_presence = *(u32 *)raw_data; | |
202 | ret = 0; | |
203 | break; | |
204 | default: | |
205 | break; | |
206 | } | |
207 | ||
208 | return ret; | |
209 | } | |
210 | ||
211 | /* Parse report which is specific to an usage id*/ | |
212 | static int prox_parse_report(struct platform_device *pdev, | |
213 | struct hid_sensor_hub_device *hsdev, | |
214 | struct iio_chan_spec *channels, | |
215 | unsigned usage_id, | |
216 | struct prox_state *st) | |
217 | { | |
218 | int ret; | |
219 | ||
220 | ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT, | |
221 | usage_id, | |
222 | HID_USAGE_SENSOR_HUMAN_PRESENCE, | |
223 | &st->prox_attr); | |
224 | if (ret < 0) | |
225 | return ret; | |
226 | prox_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESENCE, | |
227 | st->prox_attr.size); | |
228 | ||
229 | dev_dbg(&pdev->dev, "prox %x:%x\n", st->prox_attr.index, | |
230 | st->prox_attr.report_id); | |
231 | ||
232 | /* Set Sensitivity field ids, when there is no individual modifier */ | |
233 | if (st->common_attributes.sensitivity.index < 0) { | |
234 | sensor_hub_input_get_attribute_info(hsdev, | |
235 | HID_FEATURE_REPORT, usage_id, | |
236 | HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS | | |
237 | HID_USAGE_SENSOR_DATA_PRESENCE, | |
238 | &st->common_attributes.sensitivity); | |
239 | dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n", | |
240 | st->common_attributes.sensitivity.index, | |
241 | st->common_attributes.sensitivity.report_id); | |
242 | } | |
b0105002 SH |
243 | if (st->common_attributes.sensitivity.index < 0) |
244 | sensor_hub_input_get_attribute_info(hsdev, | |
245 | HID_FEATURE_REPORT, usage_id, | |
246 | HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS | | |
247 | HID_USAGE_SENSOR_HUMAN_PRESENCE, | |
248 | &st->common_attributes.sensitivity); | |
249 | ||
39a3a013 AP |
250 | return ret; |
251 | } | |
252 | ||
253 | /* Function to initialize the processing for usage id */ | |
254 | static int hid_prox_probe(struct platform_device *pdev) | |
255 | { | |
256 | int ret = 0; | |
257 | static const char *name = "prox"; | |
258 | struct iio_dev *indio_dev; | |
259 | struct prox_state *prox_state; | |
260 | struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; | |
39a3a013 AP |
261 | |
262 | indio_dev = devm_iio_device_alloc(&pdev->dev, | |
263 | sizeof(struct prox_state)); | |
264 | if (!indio_dev) | |
265 | return -ENOMEM; | |
266 | platform_set_drvdata(pdev, indio_dev); | |
267 | ||
268 | prox_state = iio_priv(indio_dev); | |
269 | prox_state->common_attributes.hsdev = hsdev; | |
270 | prox_state->common_attributes.pdev = pdev; | |
271 | ||
272 | ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_PROX, | |
273 | &prox_state->common_attributes); | |
274 | if (ret) { | |
275 | dev_err(&pdev->dev, "failed to setup common attributes\n"); | |
276 | return ret; | |
277 | } | |
278 | ||
f0828ba9 FE |
279 | indio_dev->channels = kmemdup(prox_channels, sizeof(prox_channels), |
280 | GFP_KERNEL); | |
281 | if (!indio_dev->channels) { | |
39a3a013 AP |
282 | dev_err(&pdev->dev, "failed to duplicate channels\n"); |
283 | return -ENOMEM; | |
284 | } | |
285 | ||
f0828ba9 FE |
286 | ret = prox_parse_report(pdev, hsdev, |
287 | (struct iio_chan_spec *)indio_dev->channels, | |
39a3a013 AP |
288 | HID_USAGE_SENSOR_PROX, prox_state); |
289 | if (ret) { | |
290 | dev_err(&pdev->dev, "failed to setup attributes\n"); | |
291 | goto error_free_dev_mem; | |
292 | } | |
293 | ||
1ca0259b | 294 | indio_dev->num_channels = ARRAY_SIZE(prox_channels); |
39a3a013 AP |
295 | indio_dev->dev.parent = &pdev->dev; |
296 | indio_dev->info = &prox_info; | |
297 | indio_dev->name = name; | |
298 | indio_dev->modes = INDIO_DIRECT_MODE; | |
299 | ||
300 | ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, | |
301 | NULL, NULL); | |
302 | if (ret) { | |
303 | dev_err(&pdev->dev, "failed to initialize trigger buffer\n"); | |
304 | goto error_free_dev_mem; | |
305 | } | |
56ff6be6 | 306 | atomic_set(&prox_state->common_attributes.data_ready, 0); |
39a3a013 AP |
307 | ret = hid_sensor_setup_trigger(indio_dev, name, |
308 | &prox_state->common_attributes); | |
309 | if (ret) { | |
310 | dev_err(&pdev->dev, "trigger setup failed\n"); | |
311 | goto error_unreg_buffer_funcs; | |
312 | } | |
313 | ||
314 | ret = iio_device_register(indio_dev); | |
315 | if (ret) { | |
316 | dev_err(&pdev->dev, "device register failed\n"); | |
317 | goto error_remove_trigger; | |
318 | } | |
319 | ||
320 | prox_state->callbacks.send_event = prox_proc_event; | |
321 | prox_state->callbacks.capture_sample = prox_capture_sample; | |
322 | prox_state->callbacks.pdev = pdev; | |
323 | ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PROX, | |
324 | &prox_state->callbacks); | |
325 | if (ret < 0) { | |
326 | dev_err(&pdev->dev, "callback reg failed\n"); | |
327 | goto error_iio_unreg; | |
328 | } | |
329 | ||
330 | return ret; | |
331 | ||
332 | error_iio_unreg: | |
333 | iio_device_unregister(indio_dev); | |
334 | error_remove_trigger: | |
335 | hid_sensor_remove_trigger(&prox_state->common_attributes); | |
336 | error_unreg_buffer_funcs: | |
337 | iio_triggered_buffer_cleanup(indio_dev); | |
338 | error_free_dev_mem: | |
339 | kfree(indio_dev->channels); | |
340 | return ret; | |
341 | } | |
342 | ||
343 | /* Function to deinitialize the processing for usage id */ | |
344 | static int hid_prox_remove(struct platform_device *pdev) | |
345 | { | |
346 | struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; | |
347 | struct iio_dev *indio_dev = platform_get_drvdata(pdev); | |
348 | struct prox_state *prox_state = iio_priv(indio_dev); | |
349 | ||
350 | sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PROX); | |
351 | iio_device_unregister(indio_dev); | |
352 | hid_sensor_remove_trigger(&prox_state->common_attributes); | |
353 | iio_triggered_buffer_cleanup(indio_dev); | |
354 | kfree(indio_dev->channels); | |
355 | ||
356 | return 0; | |
357 | } | |
358 | ||
42050861 | 359 | static const struct platform_device_id hid_prox_ids[] = { |
39a3a013 AP |
360 | { |
361 | /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ | |
362 | .name = "HID-SENSOR-200011", | |
363 | }, | |
364 | { /* sentinel */ } | |
365 | }; | |
366 | MODULE_DEVICE_TABLE(platform, hid_prox_ids); | |
367 | ||
368 | static struct platform_driver hid_prox_platform_driver = { | |
369 | .id_table = hid_prox_ids, | |
370 | .driver = { | |
371 | .name = KBUILD_MODNAME, | |
a357b9b0 | 372 | .pm = &hid_sensor_pm_ops, |
39a3a013 AP |
373 | }, |
374 | .probe = hid_prox_probe, | |
375 | .remove = hid_prox_remove, | |
376 | }; | |
377 | module_platform_driver(hid_prox_platform_driver); | |
378 | ||
379 | MODULE_DESCRIPTION("HID Sensor Proximity"); | |
380 | MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>"); | |
381 | MODULE_LICENSE("GPL"); |