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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, | |
46 | .modified = 1, | |
47 | .channel2 = IIO_NO_MOD, | |
48 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), | |
49 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | | |
50 | BIT(IIO_CHAN_INFO_SCALE) | | |
51 | BIT(IIO_CHAN_INFO_SAMP_FREQ) | | |
52 | BIT(IIO_CHAN_INFO_HYSTERESIS), | |
53 | .scan_index = CHANNEL_SCAN_INDEX_PRESENCE, | |
54 | } | |
55 | }; | |
56 | ||
57 | /* Adjust channel real bits based on report descriptor */ | |
58 | static void prox_adjust_channel_bit_mask(struct iio_chan_spec *channels, | |
59 | int channel, int size) | |
60 | { | |
61 | channels[channel].scan_type.sign = 's'; | |
62 | /* Real storage bits will change based on the report desc. */ | |
63 | channels[channel].scan_type.realbits = size * 8; | |
64 | /* Maximum size of a sample to capture is u32 */ | |
65 | channels[channel].scan_type.storagebits = sizeof(u32) * 8; | |
66 | } | |
67 | ||
68 | /* Channel read_raw handler */ | |
69 | static int prox_read_raw(struct iio_dev *indio_dev, | |
70 | struct iio_chan_spec const *chan, | |
71 | int *val, int *val2, | |
72 | long mask) | |
73 | { | |
74 | struct prox_state *prox_state = iio_priv(indio_dev); | |
75 | int report_id = -1; | |
76 | u32 address; | |
39a3a013 AP |
77 | int ret_type; |
78 | ||
79 | *val = 0; | |
80 | *val2 = 0; | |
81 | switch (mask) { | |
82 | case IIO_CHAN_INFO_RAW: | |
83 | switch (chan->scan_index) { | |
84 | case CHANNEL_SCAN_INDEX_PRESENCE: | |
85 | report_id = prox_state->prox_attr.report_id; | |
86 | address = | |
87 | HID_USAGE_SENSOR_HUMAN_PRESENCE; | |
88 | break; | |
89 | default: | |
90 | report_id = -1; | |
91 | break; | |
92 | } | |
1eef0620 | 93 | if (report_id >= 0) { |
1eef0620 SP |
94 | hid_sensor_power_state(&prox_state->common_attributes, |
95 | true); | |
39a3a013 AP |
96 | *val = sensor_hub_input_attr_get_raw_value( |
97 | prox_state->common_attributes.hsdev, | |
98 | HID_USAGE_SENSOR_PROX, address, | |
b3f4737d SP |
99 | report_id, |
100 | SENSOR_HUB_SYNC); | |
1eef0620 SP |
101 | hid_sensor_power_state(&prox_state->common_attributes, |
102 | false); | |
103 | } else { | |
39a3a013 AP |
104 | *val = 0; |
105 | return -EINVAL; | |
106 | } | |
107 | ret_type = IIO_VAL_INT; | |
108 | break; | |
109 | case IIO_CHAN_INFO_SCALE: | |
110 | *val = prox_state->prox_attr.units; | |
111 | ret_type = IIO_VAL_INT; | |
112 | break; | |
113 | case IIO_CHAN_INFO_OFFSET: | |
114 | *val = hid_sensor_convert_exponent( | |
115 | prox_state->prox_attr.unit_expo); | |
116 | ret_type = IIO_VAL_INT; | |
117 | break; | |
118 | case IIO_CHAN_INFO_SAMP_FREQ: | |
4ff9f633 | 119 | ret_type = hid_sensor_read_samp_freq_value( |
39a3a013 | 120 | &prox_state->common_attributes, val, val2); |
39a3a013 AP |
121 | break; |
122 | case IIO_CHAN_INFO_HYSTERESIS: | |
4ff9f633 | 123 | ret_type = hid_sensor_read_raw_hyst_value( |
39a3a013 | 124 | &prox_state->common_attributes, val, val2); |
39a3a013 AP |
125 | break; |
126 | default: | |
127 | ret_type = -EINVAL; | |
128 | break; | |
129 | } | |
130 | ||
131 | return ret_type; | |
132 | } | |
133 | ||
134 | /* Channel write_raw handler */ | |
135 | static int prox_write_raw(struct iio_dev *indio_dev, | |
136 | struct iio_chan_spec const *chan, | |
137 | int val, | |
138 | int val2, | |
139 | long mask) | |
140 | { | |
141 | struct prox_state *prox_state = iio_priv(indio_dev); | |
142 | int ret = 0; | |
143 | ||
144 | switch (mask) { | |
145 | case IIO_CHAN_INFO_SAMP_FREQ: | |
146 | ret = hid_sensor_write_samp_freq_value( | |
147 | &prox_state->common_attributes, val, val2); | |
148 | break; | |
149 | case IIO_CHAN_INFO_HYSTERESIS: | |
150 | ret = hid_sensor_write_raw_hyst_value( | |
151 | &prox_state->common_attributes, val, val2); | |
152 | break; | |
153 | default: | |
154 | ret = -EINVAL; | |
155 | } | |
156 | ||
157 | return ret; | |
158 | } | |
159 | ||
160 | static const struct iio_info prox_info = { | |
161 | .driver_module = THIS_MODULE, | |
162 | .read_raw = &prox_read_raw, | |
163 | .write_raw = &prox_write_raw, | |
164 | }; | |
165 | ||
166 | /* Function to push data to buffer */ | |
167 | static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data, | |
168 | int len) | |
169 | { | |
170 | dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); | |
171 | iio_push_to_buffers(indio_dev, data); | |
172 | } | |
173 | ||
174 | /* Callback handler to send event after all samples are received and captured */ | |
175 | static int prox_proc_event(struct hid_sensor_hub_device *hsdev, | |
176 | unsigned usage_id, | |
177 | void *priv) | |
178 | { | |
179 | struct iio_dev *indio_dev = platform_get_drvdata(priv); | |
180 | struct prox_state *prox_state = iio_priv(indio_dev); | |
181 | ||
56ff6be6 SP |
182 | dev_dbg(&indio_dev->dev, "prox_proc_event\n"); |
183 | if (atomic_read(&prox_state->common_attributes.data_ready)) | |
39a3a013 AP |
184 | hid_sensor_push_data(indio_dev, |
185 | &prox_state->human_presence, | |
186 | sizeof(prox_state->human_presence)); | |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
191 | /* Capture samples in local storage */ | |
192 | static int prox_capture_sample(struct hid_sensor_hub_device *hsdev, | |
193 | unsigned usage_id, | |
194 | size_t raw_len, char *raw_data, | |
195 | void *priv) | |
196 | { | |
197 | struct iio_dev *indio_dev = platform_get_drvdata(priv); | |
198 | struct prox_state *prox_state = iio_priv(indio_dev); | |
199 | int ret = -EINVAL; | |
200 | ||
201 | switch (usage_id) { | |
202 | case HID_USAGE_SENSOR_HUMAN_PRESENCE: | |
203 | prox_state->human_presence = *(u32 *)raw_data; | |
204 | ret = 0; | |
205 | break; | |
206 | default: | |
207 | break; | |
208 | } | |
209 | ||
210 | return ret; | |
211 | } | |
212 | ||
213 | /* Parse report which is specific to an usage id*/ | |
214 | static int prox_parse_report(struct platform_device *pdev, | |
215 | struct hid_sensor_hub_device *hsdev, | |
216 | struct iio_chan_spec *channels, | |
217 | unsigned usage_id, | |
218 | struct prox_state *st) | |
219 | { | |
220 | int ret; | |
221 | ||
222 | ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT, | |
223 | usage_id, | |
224 | HID_USAGE_SENSOR_HUMAN_PRESENCE, | |
225 | &st->prox_attr); | |
226 | if (ret < 0) | |
227 | return ret; | |
228 | prox_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESENCE, | |
229 | st->prox_attr.size); | |
230 | ||
231 | dev_dbg(&pdev->dev, "prox %x:%x\n", st->prox_attr.index, | |
232 | st->prox_attr.report_id); | |
233 | ||
234 | /* Set Sensitivity field ids, when there is no individual modifier */ | |
235 | if (st->common_attributes.sensitivity.index < 0) { | |
236 | sensor_hub_input_get_attribute_info(hsdev, | |
237 | HID_FEATURE_REPORT, usage_id, | |
238 | HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS | | |
239 | HID_USAGE_SENSOR_DATA_PRESENCE, | |
240 | &st->common_attributes.sensitivity); | |
241 | dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n", | |
242 | st->common_attributes.sensitivity.index, | |
243 | st->common_attributes.sensitivity.report_id); | |
244 | } | |
245 | return ret; | |
246 | } | |
247 | ||
248 | /* Function to initialize the processing for usage id */ | |
249 | static int hid_prox_probe(struct platform_device *pdev) | |
250 | { | |
251 | int ret = 0; | |
252 | static const char *name = "prox"; | |
253 | struct iio_dev *indio_dev; | |
254 | struct prox_state *prox_state; | |
255 | struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; | |
256 | struct iio_chan_spec *channels; | |
257 | ||
258 | indio_dev = devm_iio_device_alloc(&pdev->dev, | |
259 | sizeof(struct prox_state)); | |
260 | if (!indio_dev) | |
261 | return -ENOMEM; | |
262 | platform_set_drvdata(pdev, indio_dev); | |
263 | ||
264 | prox_state = iio_priv(indio_dev); | |
265 | prox_state->common_attributes.hsdev = hsdev; | |
266 | prox_state->common_attributes.pdev = pdev; | |
267 | ||
268 | ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_PROX, | |
269 | &prox_state->common_attributes); | |
270 | if (ret) { | |
271 | dev_err(&pdev->dev, "failed to setup common attributes\n"); | |
272 | return ret; | |
273 | } | |
274 | ||
275 | channels = kmemdup(prox_channels, sizeof(prox_channels), GFP_KERNEL); | |
276 | if (!channels) { | |
277 | dev_err(&pdev->dev, "failed to duplicate channels\n"); | |
278 | return -ENOMEM; | |
279 | } | |
280 | ||
281 | ret = prox_parse_report(pdev, hsdev, channels, | |
282 | HID_USAGE_SENSOR_PROX, prox_state); | |
283 | if (ret) { | |
284 | dev_err(&pdev->dev, "failed to setup attributes\n"); | |
285 | goto error_free_dev_mem; | |
286 | } | |
287 | ||
288 | indio_dev->channels = channels; | |
289 | indio_dev->num_channels = | |
290 | ARRAY_SIZE(prox_channels); | |
291 | indio_dev->dev.parent = &pdev->dev; | |
292 | indio_dev->info = &prox_info; | |
293 | indio_dev->name = name; | |
294 | indio_dev->modes = INDIO_DIRECT_MODE; | |
295 | ||
296 | ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, | |
297 | NULL, NULL); | |
298 | if (ret) { | |
299 | dev_err(&pdev->dev, "failed to initialize trigger buffer\n"); | |
300 | goto error_free_dev_mem; | |
301 | } | |
56ff6be6 | 302 | atomic_set(&prox_state->common_attributes.data_ready, 0); |
39a3a013 AP |
303 | ret = hid_sensor_setup_trigger(indio_dev, name, |
304 | &prox_state->common_attributes); | |
305 | if (ret) { | |
306 | dev_err(&pdev->dev, "trigger setup failed\n"); | |
307 | goto error_unreg_buffer_funcs; | |
308 | } | |
309 | ||
310 | ret = iio_device_register(indio_dev); | |
311 | if (ret) { | |
312 | dev_err(&pdev->dev, "device register failed\n"); | |
313 | goto error_remove_trigger; | |
314 | } | |
315 | ||
316 | prox_state->callbacks.send_event = prox_proc_event; | |
317 | prox_state->callbacks.capture_sample = prox_capture_sample; | |
318 | prox_state->callbacks.pdev = pdev; | |
319 | ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PROX, | |
320 | &prox_state->callbacks); | |
321 | if (ret < 0) { | |
322 | dev_err(&pdev->dev, "callback reg failed\n"); | |
323 | goto error_iio_unreg; | |
324 | } | |
325 | ||
326 | return ret; | |
327 | ||
328 | error_iio_unreg: | |
329 | iio_device_unregister(indio_dev); | |
330 | error_remove_trigger: | |
331 | hid_sensor_remove_trigger(&prox_state->common_attributes); | |
332 | error_unreg_buffer_funcs: | |
333 | iio_triggered_buffer_cleanup(indio_dev); | |
334 | error_free_dev_mem: | |
335 | kfree(indio_dev->channels); | |
336 | return ret; | |
337 | } | |
338 | ||
339 | /* Function to deinitialize the processing for usage id */ | |
340 | static int hid_prox_remove(struct platform_device *pdev) | |
341 | { | |
342 | struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; | |
343 | struct iio_dev *indio_dev = platform_get_drvdata(pdev); | |
344 | struct prox_state *prox_state = iio_priv(indio_dev); | |
345 | ||
346 | sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PROX); | |
347 | iio_device_unregister(indio_dev); | |
348 | hid_sensor_remove_trigger(&prox_state->common_attributes); | |
349 | iio_triggered_buffer_cleanup(indio_dev); | |
350 | kfree(indio_dev->channels); | |
351 | ||
352 | return 0; | |
353 | } | |
354 | ||
355 | static struct platform_device_id hid_prox_ids[] = { | |
356 | { | |
357 | /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ | |
358 | .name = "HID-SENSOR-200011", | |
359 | }, | |
360 | { /* sentinel */ } | |
361 | }; | |
362 | MODULE_DEVICE_TABLE(platform, hid_prox_ids); | |
363 | ||
364 | static struct platform_driver hid_prox_platform_driver = { | |
365 | .id_table = hid_prox_ids, | |
366 | .driver = { | |
367 | .name = KBUILD_MODNAME, | |
a357b9b0 | 368 | .pm = &hid_sensor_pm_ops, |
39a3a013 AP |
369 | }, |
370 | .probe = hid_prox_probe, | |
371 | .remove = hid_prox_remove, | |
372 | }; | |
373 | module_platform_driver(hid_prox_platform_driver); | |
374 | ||
375 | MODULE_DESCRIPTION("HID Sensor Proximity"); | |
376 | MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>"); | |
377 | MODULE_LICENSE("GPL"); |