Commit | Line | Data |
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ed5514c9 | 1 | /* |
2 | * HID Sensors Driver | |
3 | * Copyright (c) 2012, 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; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | * | |
18 | */ | |
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> | |
371a1233 | 25 | #include <linux/delay.h> |
ed5514c9 | 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> | |
ed5514c9 | 32 | #include "../common/hid-sensors/hid-sensor-trigger.h" |
33 | ||
ed5514c9 | 34 | #define CHANNEL_SCAN_INDEX_ILLUM 0 |
35 | ||
36 | struct als_state { | |
37 | struct hid_sensor_hub_callbacks callbacks; | |
e07c6d17 | 38 | struct hid_sensor_common common_attributes; |
ed5514c9 | 39 | struct hid_sensor_hub_attribute_info als_illum; |
40 | u32 illum; | |
36783d09 SP |
41 | int scale_pre_decml; |
42 | int scale_post_decml; | |
43 | int scale_precision; | |
44 | int value_offset; | |
ed5514c9 | 45 | }; |
46 | ||
47 | /* Channel definitions */ | |
48 | static const struct iio_chan_spec als_channels[] = { | |
49 | { | |
50 | .type = IIO_INTENSITY, | |
51 | .modified = 1, | |
52 | .channel2 = IIO_MOD_LIGHT_BOTH, | |
371a1233 | 53 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
ecbe18f2 JC |
54 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | |
55 | BIT(IIO_CHAN_INFO_SCALE) | | |
56 | BIT(IIO_CHAN_INFO_SAMP_FREQ) | | |
57 | BIT(IIO_CHAN_INFO_HYSTERESIS), | |
ed5514c9 | 58 | .scan_index = CHANNEL_SCAN_INDEX_ILLUM, |
59 | } | |
60 | }; | |
61 | ||
62 | /* Adjust channel real bits based on report descriptor */ | |
63 | static void als_adjust_channel_bit_mask(struct iio_chan_spec *channels, | |
64 | int channel, int size) | |
65 | { | |
66 | channels[channel].scan_type.sign = 's'; | |
67 | /* Real storage bits will change based on the report desc. */ | |
68 | channels[channel].scan_type.realbits = size * 8; | |
69 | /* Maximum size of a sample to capture is u32 */ | |
70 | channels[channel].scan_type.storagebits = sizeof(u32) * 8; | |
71 | } | |
72 | ||
73 | /* Channel read_raw handler */ | |
74 | static int als_read_raw(struct iio_dev *indio_dev, | |
75 | struct iio_chan_spec const *chan, | |
76 | int *val, int *val2, | |
77 | long mask) | |
78 | { | |
79 | struct als_state *als_state = iio_priv(indio_dev); | |
80 | int report_id = -1; | |
81 | u32 address; | |
ed5514c9 | 82 | int ret_type; |
83 | ||
84 | *val = 0; | |
85 | *val2 = 0; | |
86 | switch (mask) { | |
87 | case 0: | |
88 | switch (chan->scan_index) { | |
89 | case CHANNEL_SCAN_INDEX_ILLUM: | |
90 | report_id = als_state->als_illum.report_id; | |
91 | address = | |
92 | HID_USAGE_SENSOR_LIGHT_ILLUM; | |
93 | break; | |
94 | default: | |
95 | report_id = -1; | |
96 | break; | |
97 | } | |
371a1233 | 98 | if (report_id >= 0) { |
371a1233 SP |
99 | hid_sensor_power_state(&als_state->common_attributes, |
100 | true); | |
ed5514c9 | 101 | *val = sensor_hub_input_attr_get_raw_value( |
371a1233 SP |
102 | als_state->common_attributes.hsdev, |
103 | HID_USAGE_SENSOR_ALS, address, | |
b3f4737d SP |
104 | report_id, |
105 | SENSOR_HUB_SYNC); | |
371a1233 SP |
106 | hid_sensor_power_state(&als_state->common_attributes, |
107 | false); | |
108 | } else { | |
ed5514c9 | 109 | *val = 0; |
110 | return -EINVAL; | |
111 | } | |
112 | ret_type = IIO_VAL_INT; | |
113 | break; | |
114 | case IIO_CHAN_INFO_SCALE: | |
36783d09 SP |
115 | *val = als_state->scale_pre_decml; |
116 | *val2 = als_state->scale_post_decml; | |
117 | ret_type = als_state->scale_precision; | |
ed5514c9 | 118 | break; |
119 | case IIO_CHAN_INFO_OFFSET: | |
36783d09 | 120 | *val = als_state->value_offset; |
ed5514c9 | 121 | ret_type = IIO_VAL_INT; |
122 | break; | |
123 | case IIO_CHAN_INFO_SAMP_FREQ: | |
5d24b0b3 | 124 | ret_type = hid_sensor_read_samp_freq_value( |
ed5514c9 | 125 | &als_state->common_attributes, val, val2); |
ed5514c9 | 126 | break; |
127 | case IIO_CHAN_INFO_HYSTERESIS: | |
5d24b0b3 | 128 | ret_type = hid_sensor_read_raw_hyst_value( |
ed5514c9 | 129 | &als_state->common_attributes, val, val2); |
ed5514c9 | 130 | break; |
131 | default: | |
132 | ret_type = -EINVAL; | |
133 | break; | |
134 | } | |
135 | ||
136 | return ret_type; | |
137 | } | |
138 | ||
139 | /* Channel write_raw handler */ | |
140 | static int als_write_raw(struct iio_dev *indio_dev, | |
141 | struct iio_chan_spec const *chan, | |
142 | int val, | |
143 | int val2, | |
144 | long mask) | |
145 | { | |
146 | struct als_state *als_state = iio_priv(indio_dev); | |
147 | int ret = 0; | |
148 | ||
149 | switch (mask) { | |
150 | case IIO_CHAN_INFO_SAMP_FREQ: | |
151 | ret = hid_sensor_write_samp_freq_value( | |
152 | &als_state->common_attributes, val, val2); | |
153 | break; | |
154 | case IIO_CHAN_INFO_HYSTERESIS: | |
155 | ret = hid_sensor_write_raw_hyst_value( | |
156 | &als_state->common_attributes, val, val2); | |
157 | break; | |
158 | default: | |
159 | ret = -EINVAL; | |
160 | } | |
161 | ||
162 | return ret; | |
163 | } | |
164 | ||
ed5514c9 | 165 | static const struct iio_info als_info = { |
166 | .driver_module = THIS_MODULE, | |
167 | .read_raw = &als_read_raw, | |
168 | .write_raw = &als_write_raw, | |
ed5514c9 | 169 | }; |
170 | ||
171 | /* Function to push data to buffer */ | |
8c60c7e7 LPC |
172 | static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data, |
173 | int len) | |
ed5514c9 | 174 | { |
ed5514c9 | 175 | dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); |
8c60c7e7 | 176 | iio_push_to_buffers(indio_dev, data); |
ed5514c9 | 177 | } |
178 | ||
179 | /* Callback handler to send event after all samples are received and captured */ | |
180 | static int als_proc_event(struct hid_sensor_hub_device *hsdev, | |
181 | unsigned usage_id, | |
182 | void *priv) | |
183 | { | |
184 | struct iio_dev *indio_dev = platform_get_drvdata(priv); | |
185 | struct als_state *als_state = iio_priv(indio_dev); | |
186 | ||
56ff6be6 SP |
187 | dev_dbg(&indio_dev->dev, "als_proc_event\n"); |
188 | if (atomic_read(&als_state->common_attributes.data_ready)) | |
ed5514c9 | 189 | hid_sensor_push_data(indio_dev, |
8c60c7e7 | 190 | &als_state->illum, |
ed5514c9 | 191 | sizeof(als_state->illum)); |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
196 | /* Capture samples in local storage */ | |
197 | static int als_capture_sample(struct hid_sensor_hub_device *hsdev, | |
198 | unsigned usage_id, | |
199 | size_t raw_len, char *raw_data, | |
200 | void *priv) | |
201 | { | |
202 | struct iio_dev *indio_dev = platform_get_drvdata(priv); | |
203 | struct als_state *als_state = iio_priv(indio_dev); | |
204 | int ret = -EINVAL; | |
205 | ||
206 | switch (usage_id) { | |
207 | case HID_USAGE_SENSOR_LIGHT_ILLUM: | |
208 | als_state->illum = *(u32 *)raw_data; | |
209 | ret = 0; | |
210 | break; | |
211 | default: | |
212 | break; | |
213 | } | |
214 | ||
215 | return ret; | |
216 | } | |
217 | ||
218 | /* Parse report which is specific to an usage id*/ | |
219 | static int als_parse_report(struct platform_device *pdev, | |
220 | struct hid_sensor_hub_device *hsdev, | |
221 | struct iio_chan_spec *channels, | |
222 | unsigned usage_id, | |
223 | struct als_state *st) | |
224 | { | |
225 | int ret; | |
226 | ||
227 | ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT, | |
228 | usage_id, | |
229 | HID_USAGE_SENSOR_LIGHT_ILLUM, | |
230 | &st->als_illum); | |
231 | if (ret < 0) | |
232 | return ret; | |
233 | als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_ILLUM, | |
234 | st->als_illum.size); | |
235 | ||
236 | dev_dbg(&pdev->dev, "als %x:%x\n", st->als_illum.index, | |
237 | st->als_illum.report_id); | |
238 | ||
36783d09 SP |
239 | st->scale_precision = hid_sensor_format_scale( |
240 | HID_USAGE_SENSOR_ALS, | |
241 | &st->als_illum, | |
242 | &st->scale_pre_decml, &st->scale_post_decml); | |
243 | ||
f87ee1bd SP |
244 | /* Set Sensitivity field ids, when there is no individual modifier */ |
245 | if (st->common_attributes.sensitivity.index < 0) { | |
246 | sensor_hub_input_get_attribute_info(hsdev, | |
247 | HID_FEATURE_REPORT, usage_id, | |
248 | HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS | | |
249 | HID_USAGE_SENSOR_DATA_LIGHT, | |
250 | &st->common_attributes.sensitivity); | |
251 | dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n", | |
252 | st->common_attributes.sensitivity.index, | |
253 | st->common_attributes.sensitivity.report_id); | |
254 | } | |
ed5514c9 | 255 | return ret; |
256 | } | |
257 | ||
258 | /* Function to initialize the processing for usage id */ | |
fc52692c | 259 | static int hid_als_probe(struct platform_device *pdev) |
ed5514c9 | 260 | { |
261 | int ret = 0; | |
262 | static const char *name = "als"; | |
263 | struct iio_dev *indio_dev; | |
264 | struct als_state *als_state; | |
265 | struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; | |
ed5514c9 | 266 | |
47aff92c SK |
267 | indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct als_state)); |
268 | if (!indio_dev) | |
269 | return -ENOMEM; | |
ed5514c9 | 270 | platform_set_drvdata(pdev, indio_dev); |
271 | ||
272 | als_state = iio_priv(indio_dev); | |
273 | als_state->common_attributes.hsdev = hsdev; | |
274 | als_state->common_attributes.pdev = pdev; | |
275 | ||
276 | ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_ALS, | |
277 | &als_state->common_attributes); | |
278 | if (ret) { | |
279 | dev_err(&pdev->dev, "failed to setup common attributes\n"); | |
47aff92c | 280 | return ret; |
ed5514c9 | 281 | } |
282 | ||
9ecdbed7 FE |
283 | indio_dev->channels = kmemdup(als_channels, |
284 | sizeof(als_channels), GFP_KERNEL); | |
285 | if (!indio_dev->channels) { | |
ed5514c9 | 286 | dev_err(&pdev->dev, "failed to duplicate channels\n"); |
47aff92c | 287 | return -ENOMEM; |
ed5514c9 | 288 | } |
289 | ||
9ecdbed7 FE |
290 | ret = als_parse_report(pdev, hsdev, |
291 | (struct iio_chan_spec *)indio_dev->channels, | |
292 | HID_USAGE_SENSOR_ALS, als_state); | |
ed5514c9 | 293 | if (ret) { |
294 | dev_err(&pdev->dev, "failed to setup attributes\n"); | |
295 | goto error_free_dev_mem; | |
296 | } | |
297 | ||
ed5514c9 | 298 | indio_dev->num_channels = |
299 | ARRAY_SIZE(als_channels); | |
300 | indio_dev->dev.parent = &pdev->dev; | |
301 | indio_dev->info = &als_info; | |
302 | indio_dev->name = name; | |
303 | indio_dev->modes = INDIO_DIRECT_MODE; | |
304 | ||
305 | ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, | |
306 | NULL, NULL); | |
307 | if (ret) { | |
308 | dev_err(&pdev->dev, "failed to initialize trigger buffer\n"); | |
309 | goto error_free_dev_mem; | |
310 | } | |
56ff6be6 | 311 | atomic_set(&als_state->common_attributes.data_ready, 0); |
ed5514c9 | 312 | ret = hid_sensor_setup_trigger(indio_dev, name, |
313 | &als_state->common_attributes); | |
314 | if (ret < 0) { | |
315 | dev_err(&pdev->dev, "trigger setup failed\n"); | |
316 | goto error_unreg_buffer_funcs; | |
317 | } | |
318 | ||
319 | ret = iio_device_register(indio_dev); | |
320 | if (ret) { | |
321 | dev_err(&pdev->dev, "device register failed\n"); | |
322 | goto error_remove_trigger; | |
323 | } | |
324 | ||
325 | als_state->callbacks.send_event = als_proc_event; | |
326 | als_state->callbacks.capture_sample = als_capture_sample; | |
327 | als_state->callbacks.pdev = pdev; | |
328 | ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ALS, | |
329 | &als_state->callbacks); | |
330 | if (ret < 0) { | |
331 | dev_err(&pdev->dev, "callback reg failed\n"); | |
332 | goto error_iio_unreg; | |
333 | } | |
334 | ||
335 | return ret; | |
336 | ||
337 | error_iio_unreg: | |
338 | iio_device_unregister(indio_dev); | |
339 | error_remove_trigger: | |
ec7f68e0 | 340 | hid_sensor_remove_trigger(&als_state->common_attributes); |
ed5514c9 | 341 | error_unreg_buffer_funcs: |
342 | iio_triggered_buffer_cleanup(indio_dev); | |
343 | error_free_dev_mem: | |
344 | kfree(indio_dev->channels); | |
ed5514c9 | 345 | return ret; |
346 | } | |
347 | ||
348 | /* Function to deinitialize the processing for usage id */ | |
fc52692c | 349 | static int hid_als_remove(struct platform_device *pdev) |
ed5514c9 | 350 | { |
351 | struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; | |
352 | struct iio_dev *indio_dev = platform_get_drvdata(pdev); | |
ec7f68e0 | 353 | struct als_state *als_state = iio_priv(indio_dev); |
ed5514c9 | 354 | |
355 | sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ALS); | |
356 | iio_device_unregister(indio_dev); | |
ec7f68e0 | 357 | hid_sensor_remove_trigger(&als_state->common_attributes); |
ed5514c9 | 358 | iio_triggered_buffer_cleanup(indio_dev); |
359 | kfree(indio_dev->channels); | |
ed5514c9 | 360 | |
361 | return 0; | |
362 | } | |
363 | ||
4e617fc1 | 364 | static const struct platform_device_id hid_als_ids[] = { |
5b812ea5 AH |
365 | { |
366 | /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ | |
367 | .name = "HID-SENSOR-200041", | |
368 | }, | |
369 | { /* sentinel */ } | |
370 | }; | |
371 | MODULE_DEVICE_TABLE(platform, hid_als_ids); | |
372 | ||
ed5514c9 | 373 | static struct platform_driver hid_als_platform_driver = { |
5b812ea5 | 374 | .id_table = hid_als_ids, |
ed5514c9 | 375 | .driver = { |
5b812ea5 | 376 | .name = KBUILD_MODNAME, |
2c615aff | 377 | .pm = &hid_sensor_pm_ops, |
ed5514c9 | 378 | }, |
379 | .probe = hid_als_probe, | |
380 | .remove = hid_als_remove, | |
381 | }; | |
382 | module_platform_driver(hid_als_platform_driver); | |
383 | ||
384 | MODULE_DESCRIPTION("HID Sensor ALS"); | |
385 | MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>"); | |
386 | MODULE_LICENSE("GPL"); |