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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; |
371a1233 | 83 | s32 poll_value; |
ed5514c9 | 84 | |
85 | *val = 0; | |
86 | *val2 = 0; | |
87 | switch (mask) { | |
88 | case 0: | |
89 | switch (chan->scan_index) { | |
90 | case CHANNEL_SCAN_INDEX_ILLUM: | |
91 | report_id = als_state->als_illum.report_id; | |
92 | address = | |
93 | HID_USAGE_SENSOR_LIGHT_ILLUM; | |
94 | break; | |
95 | default: | |
96 | report_id = -1; | |
97 | break; | |
98 | } | |
371a1233 SP |
99 | if (report_id >= 0) { |
100 | poll_value = hid_sensor_read_poll_value( | |
101 | &als_state->common_attributes); | |
102 | if (poll_value < 0) | |
103 | return -EINVAL; | |
104 | ||
105 | hid_sensor_power_state(&als_state->common_attributes, | |
106 | true); | |
107 | msleep_interruptible(poll_value * 2); | |
108 | ||
ed5514c9 | 109 | *val = sensor_hub_input_attr_get_raw_value( |
371a1233 SP |
110 | als_state->common_attributes.hsdev, |
111 | HID_USAGE_SENSOR_ALS, address, | |
112 | report_id); | |
113 | hid_sensor_power_state(&als_state->common_attributes, | |
114 | false); | |
115 | } else { | |
ed5514c9 | 116 | *val = 0; |
117 | return -EINVAL; | |
118 | } | |
119 | ret_type = IIO_VAL_INT; | |
120 | break; | |
121 | case IIO_CHAN_INFO_SCALE: | |
36783d09 SP |
122 | *val = als_state->scale_pre_decml; |
123 | *val2 = als_state->scale_post_decml; | |
124 | ret_type = als_state->scale_precision; | |
ed5514c9 | 125 | break; |
126 | case IIO_CHAN_INFO_OFFSET: | |
36783d09 | 127 | *val = als_state->value_offset; |
ed5514c9 | 128 | ret_type = IIO_VAL_INT; |
129 | break; | |
130 | case IIO_CHAN_INFO_SAMP_FREQ: | |
5d24b0b3 | 131 | ret_type = hid_sensor_read_samp_freq_value( |
ed5514c9 | 132 | &als_state->common_attributes, val, val2); |
ed5514c9 | 133 | break; |
134 | case IIO_CHAN_INFO_HYSTERESIS: | |
5d24b0b3 | 135 | ret_type = hid_sensor_read_raw_hyst_value( |
ed5514c9 | 136 | &als_state->common_attributes, val, val2); |
ed5514c9 | 137 | break; |
138 | default: | |
139 | ret_type = -EINVAL; | |
140 | break; | |
141 | } | |
142 | ||
143 | return ret_type; | |
144 | } | |
145 | ||
146 | /* Channel write_raw handler */ | |
147 | static int als_write_raw(struct iio_dev *indio_dev, | |
148 | struct iio_chan_spec const *chan, | |
149 | int val, | |
150 | int val2, | |
151 | long mask) | |
152 | { | |
153 | struct als_state *als_state = iio_priv(indio_dev); | |
154 | int ret = 0; | |
155 | ||
156 | switch (mask) { | |
157 | case IIO_CHAN_INFO_SAMP_FREQ: | |
158 | ret = hid_sensor_write_samp_freq_value( | |
159 | &als_state->common_attributes, val, val2); | |
160 | break; | |
161 | case IIO_CHAN_INFO_HYSTERESIS: | |
162 | ret = hid_sensor_write_raw_hyst_value( | |
163 | &als_state->common_attributes, val, val2); | |
164 | break; | |
165 | default: | |
166 | ret = -EINVAL; | |
167 | } | |
168 | ||
169 | return ret; | |
170 | } | |
171 | ||
ed5514c9 | 172 | static const struct iio_info als_info = { |
173 | .driver_module = THIS_MODULE, | |
174 | .read_raw = &als_read_raw, | |
175 | .write_raw = &als_write_raw, | |
ed5514c9 | 176 | }; |
177 | ||
178 | /* Function to push data to buffer */ | |
8c60c7e7 LPC |
179 | static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data, |
180 | int len) | |
ed5514c9 | 181 | { |
ed5514c9 | 182 | dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); |
8c60c7e7 | 183 | iio_push_to_buffers(indio_dev, data); |
ed5514c9 | 184 | } |
185 | ||
186 | /* Callback handler to send event after all samples are received and captured */ | |
187 | static int als_proc_event(struct hid_sensor_hub_device *hsdev, | |
188 | unsigned usage_id, | |
189 | void *priv) | |
190 | { | |
191 | struct iio_dev *indio_dev = platform_get_drvdata(priv); | |
192 | struct als_state *als_state = iio_priv(indio_dev); | |
193 | ||
56ff6be6 SP |
194 | dev_dbg(&indio_dev->dev, "als_proc_event\n"); |
195 | if (atomic_read(&als_state->common_attributes.data_ready)) | |
ed5514c9 | 196 | hid_sensor_push_data(indio_dev, |
8c60c7e7 | 197 | &als_state->illum, |
ed5514c9 | 198 | sizeof(als_state->illum)); |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | /* Capture samples in local storage */ | |
204 | static int als_capture_sample(struct hid_sensor_hub_device *hsdev, | |
205 | unsigned usage_id, | |
206 | size_t raw_len, char *raw_data, | |
207 | void *priv) | |
208 | { | |
209 | struct iio_dev *indio_dev = platform_get_drvdata(priv); | |
210 | struct als_state *als_state = iio_priv(indio_dev); | |
211 | int ret = -EINVAL; | |
212 | ||
213 | switch (usage_id) { | |
214 | case HID_USAGE_SENSOR_LIGHT_ILLUM: | |
215 | als_state->illum = *(u32 *)raw_data; | |
216 | ret = 0; | |
217 | break; | |
218 | default: | |
219 | break; | |
220 | } | |
221 | ||
222 | return ret; | |
223 | } | |
224 | ||
225 | /* Parse report which is specific to an usage id*/ | |
226 | static int als_parse_report(struct platform_device *pdev, | |
227 | struct hid_sensor_hub_device *hsdev, | |
228 | struct iio_chan_spec *channels, | |
229 | unsigned usage_id, | |
230 | struct als_state *st) | |
231 | { | |
232 | int ret; | |
233 | ||
234 | ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT, | |
235 | usage_id, | |
236 | HID_USAGE_SENSOR_LIGHT_ILLUM, | |
237 | &st->als_illum); | |
238 | if (ret < 0) | |
239 | return ret; | |
240 | als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_ILLUM, | |
241 | st->als_illum.size); | |
242 | ||
243 | dev_dbg(&pdev->dev, "als %x:%x\n", st->als_illum.index, | |
244 | st->als_illum.report_id); | |
245 | ||
36783d09 SP |
246 | st->scale_precision = hid_sensor_format_scale( |
247 | HID_USAGE_SENSOR_ALS, | |
248 | &st->als_illum, | |
249 | &st->scale_pre_decml, &st->scale_post_decml); | |
250 | ||
f87ee1bd SP |
251 | /* Set Sensitivity field ids, when there is no individual modifier */ |
252 | if (st->common_attributes.sensitivity.index < 0) { | |
253 | sensor_hub_input_get_attribute_info(hsdev, | |
254 | HID_FEATURE_REPORT, usage_id, | |
255 | HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS | | |
256 | HID_USAGE_SENSOR_DATA_LIGHT, | |
257 | &st->common_attributes.sensitivity); | |
258 | dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n", | |
259 | st->common_attributes.sensitivity.index, | |
260 | st->common_attributes.sensitivity.report_id); | |
261 | } | |
ed5514c9 | 262 | return ret; |
263 | } | |
264 | ||
265 | /* Function to initialize the processing for usage id */ | |
fc52692c | 266 | static int hid_als_probe(struct platform_device *pdev) |
ed5514c9 | 267 | { |
268 | int ret = 0; | |
269 | static const char *name = "als"; | |
270 | struct iio_dev *indio_dev; | |
271 | struct als_state *als_state; | |
272 | struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; | |
273 | struct iio_chan_spec *channels; | |
274 | ||
47aff92c SK |
275 | indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct als_state)); |
276 | if (!indio_dev) | |
277 | return -ENOMEM; | |
ed5514c9 | 278 | platform_set_drvdata(pdev, indio_dev); |
279 | ||
280 | als_state = iio_priv(indio_dev); | |
281 | als_state->common_attributes.hsdev = hsdev; | |
282 | als_state->common_attributes.pdev = pdev; | |
283 | ||
284 | ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_ALS, | |
285 | &als_state->common_attributes); | |
286 | if (ret) { | |
287 | dev_err(&pdev->dev, "failed to setup common attributes\n"); | |
47aff92c | 288 | return ret; |
ed5514c9 | 289 | } |
290 | ||
64ebe955 | 291 | channels = kmemdup(als_channels, sizeof(als_channels), GFP_KERNEL); |
ed5514c9 | 292 | if (!channels) { |
293 | dev_err(&pdev->dev, "failed to duplicate channels\n"); | |
47aff92c | 294 | return -ENOMEM; |
ed5514c9 | 295 | } |
296 | ||
297 | ret = als_parse_report(pdev, hsdev, channels, | |
298 | HID_USAGE_SENSOR_ALS, als_state); | |
299 | if (ret) { | |
300 | dev_err(&pdev->dev, "failed to setup attributes\n"); | |
301 | goto error_free_dev_mem; | |
302 | } | |
303 | ||
304 | indio_dev->channels = channels; | |
305 | indio_dev->num_channels = | |
306 | ARRAY_SIZE(als_channels); | |
307 | indio_dev->dev.parent = &pdev->dev; | |
308 | indio_dev->info = &als_info; | |
309 | indio_dev->name = name; | |
310 | indio_dev->modes = INDIO_DIRECT_MODE; | |
311 | ||
312 | ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, | |
313 | NULL, NULL); | |
314 | if (ret) { | |
315 | dev_err(&pdev->dev, "failed to initialize trigger buffer\n"); | |
316 | goto error_free_dev_mem; | |
317 | } | |
56ff6be6 | 318 | atomic_set(&als_state->common_attributes.data_ready, 0); |
ed5514c9 | 319 | ret = hid_sensor_setup_trigger(indio_dev, name, |
320 | &als_state->common_attributes); | |
321 | if (ret < 0) { | |
322 | dev_err(&pdev->dev, "trigger setup failed\n"); | |
323 | goto error_unreg_buffer_funcs; | |
324 | } | |
325 | ||
326 | ret = iio_device_register(indio_dev); | |
327 | if (ret) { | |
328 | dev_err(&pdev->dev, "device register failed\n"); | |
329 | goto error_remove_trigger; | |
330 | } | |
331 | ||
332 | als_state->callbacks.send_event = als_proc_event; | |
333 | als_state->callbacks.capture_sample = als_capture_sample; | |
334 | als_state->callbacks.pdev = pdev; | |
335 | ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ALS, | |
336 | &als_state->callbacks); | |
337 | if (ret < 0) { | |
338 | dev_err(&pdev->dev, "callback reg failed\n"); | |
339 | goto error_iio_unreg; | |
340 | } | |
341 | ||
342 | return ret; | |
343 | ||
344 | error_iio_unreg: | |
345 | iio_device_unregister(indio_dev); | |
346 | error_remove_trigger: | |
ec7f68e0 | 347 | hid_sensor_remove_trigger(&als_state->common_attributes); |
ed5514c9 | 348 | error_unreg_buffer_funcs: |
349 | iio_triggered_buffer_cleanup(indio_dev); | |
350 | error_free_dev_mem: | |
351 | kfree(indio_dev->channels); | |
ed5514c9 | 352 | return ret; |
353 | } | |
354 | ||
355 | /* Function to deinitialize the processing for usage id */ | |
fc52692c | 356 | static int hid_als_remove(struct platform_device *pdev) |
ed5514c9 | 357 | { |
358 | struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; | |
359 | struct iio_dev *indio_dev = platform_get_drvdata(pdev); | |
ec7f68e0 | 360 | struct als_state *als_state = iio_priv(indio_dev); |
ed5514c9 | 361 | |
362 | sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ALS); | |
363 | iio_device_unregister(indio_dev); | |
ec7f68e0 | 364 | hid_sensor_remove_trigger(&als_state->common_attributes); |
ed5514c9 | 365 | iio_triggered_buffer_cleanup(indio_dev); |
366 | kfree(indio_dev->channels); | |
ed5514c9 | 367 | |
368 | return 0; | |
369 | } | |
370 | ||
5b812ea5 AH |
371 | static struct platform_device_id hid_als_ids[] = { |
372 | { | |
373 | /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ | |
374 | .name = "HID-SENSOR-200041", | |
375 | }, | |
376 | { /* sentinel */ } | |
377 | }; | |
378 | MODULE_DEVICE_TABLE(platform, hid_als_ids); | |
379 | ||
ed5514c9 | 380 | static struct platform_driver hid_als_platform_driver = { |
5b812ea5 | 381 | .id_table = hid_als_ids, |
ed5514c9 | 382 | .driver = { |
5b812ea5 | 383 | .name = KBUILD_MODNAME, |
ed5514c9 | 384 | }, |
385 | .probe = hid_als_probe, | |
386 | .remove = hid_als_remove, | |
387 | }; | |
388 | module_platform_driver(hid_als_platform_driver); | |
389 | ||
390 | MODULE_DESCRIPTION("HID Sensor ALS"); | |
391 | MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>"); | |
392 | MODULE_LICENSE("GPL"); |