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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> | |
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> | |
ed5514c9 | 31 | #include "../common/hid-sensors/hid-sensor-trigger.h" |
32 | ||
ed5514c9 | 33 | #define CHANNEL_SCAN_INDEX_ILLUM 0 |
34 | ||
35 | struct als_state { | |
36 | struct hid_sensor_hub_callbacks callbacks; | |
e07c6d17 | 37 | struct hid_sensor_common common_attributes; |
ed5514c9 | 38 | struct hid_sensor_hub_attribute_info als_illum; |
39 | u32 illum; | |
36783d09 SP |
40 | int scale_pre_decml; |
41 | int scale_post_decml; | |
42 | int scale_precision; | |
43 | int value_offset; | |
ed5514c9 | 44 | }; |
45 | ||
46 | /* Channel definitions */ | |
47 | static const struct iio_chan_spec als_channels[] = { | |
48 | { | |
49 | .type = IIO_INTENSITY, | |
50 | .modified = 1, | |
51 | .channel2 = IIO_MOD_LIGHT_BOTH, | |
ecbe18f2 JC |
52 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | |
53 | BIT(IIO_CHAN_INFO_SCALE) | | |
54 | BIT(IIO_CHAN_INFO_SAMP_FREQ) | | |
55 | BIT(IIO_CHAN_INFO_HYSTERESIS), | |
ed5514c9 | 56 | .scan_index = CHANNEL_SCAN_INDEX_ILLUM, |
57 | } | |
58 | }; | |
59 | ||
60 | /* Adjust channel real bits based on report descriptor */ | |
61 | static void als_adjust_channel_bit_mask(struct iio_chan_spec *channels, | |
62 | int channel, int size) | |
63 | { | |
64 | channels[channel].scan_type.sign = 's'; | |
65 | /* Real storage bits will change based on the report desc. */ | |
66 | channels[channel].scan_type.realbits = size * 8; | |
67 | /* Maximum size of a sample to capture is u32 */ | |
68 | channels[channel].scan_type.storagebits = sizeof(u32) * 8; | |
69 | } | |
70 | ||
71 | /* Channel read_raw handler */ | |
72 | static int als_read_raw(struct iio_dev *indio_dev, | |
73 | struct iio_chan_spec const *chan, | |
74 | int *val, int *val2, | |
75 | long mask) | |
76 | { | |
77 | struct als_state *als_state = iio_priv(indio_dev); | |
78 | int report_id = -1; | |
79 | u32 address; | |
80 | int ret; | |
81 | int ret_type; | |
82 | ||
83 | *val = 0; | |
84 | *val2 = 0; | |
85 | switch (mask) { | |
86 | case 0: | |
87 | switch (chan->scan_index) { | |
88 | case CHANNEL_SCAN_INDEX_ILLUM: | |
89 | report_id = als_state->als_illum.report_id; | |
90 | address = | |
91 | HID_USAGE_SENSOR_LIGHT_ILLUM; | |
92 | break; | |
93 | default: | |
94 | report_id = -1; | |
95 | break; | |
96 | } | |
97 | if (report_id >= 0) | |
98 | *val = sensor_hub_input_attr_get_raw_value( | |
99 | als_state->common_attributes.hsdev, | |
100 | HID_USAGE_SENSOR_ALS, address, | |
101 | report_id); | |
102 | else { | |
103 | *val = 0; | |
104 | return -EINVAL; | |
105 | } | |
106 | ret_type = IIO_VAL_INT; | |
107 | break; | |
108 | case IIO_CHAN_INFO_SCALE: | |
36783d09 SP |
109 | *val = als_state->scale_pre_decml; |
110 | *val2 = als_state->scale_post_decml; | |
111 | ret_type = als_state->scale_precision; | |
ed5514c9 | 112 | break; |
113 | case IIO_CHAN_INFO_OFFSET: | |
36783d09 | 114 | *val = als_state->value_offset; |
ed5514c9 | 115 | ret_type = IIO_VAL_INT; |
116 | break; | |
117 | case IIO_CHAN_INFO_SAMP_FREQ: | |
118 | ret = hid_sensor_read_samp_freq_value( | |
119 | &als_state->common_attributes, val, val2); | |
120 | ret_type = IIO_VAL_INT_PLUS_MICRO; | |
121 | break; | |
122 | case IIO_CHAN_INFO_HYSTERESIS: | |
123 | ret = hid_sensor_read_raw_hyst_value( | |
124 | &als_state->common_attributes, val, val2); | |
125 | ret_type = IIO_VAL_INT_PLUS_MICRO; | |
126 | break; | |
127 | default: | |
128 | ret_type = -EINVAL; | |
129 | break; | |
130 | } | |
131 | ||
132 | return ret_type; | |
133 | } | |
134 | ||
135 | /* Channel write_raw handler */ | |
136 | static int als_write_raw(struct iio_dev *indio_dev, | |
137 | struct iio_chan_spec const *chan, | |
138 | int val, | |
139 | int val2, | |
140 | long mask) | |
141 | { | |
142 | struct als_state *als_state = iio_priv(indio_dev); | |
143 | int ret = 0; | |
144 | ||
145 | switch (mask) { | |
146 | case IIO_CHAN_INFO_SAMP_FREQ: | |
147 | ret = hid_sensor_write_samp_freq_value( | |
148 | &als_state->common_attributes, val, val2); | |
149 | break; | |
150 | case IIO_CHAN_INFO_HYSTERESIS: | |
151 | ret = hid_sensor_write_raw_hyst_value( | |
152 | &als_state->common_attributes, val, val2); | |
153 | break; | |
154 | default: | |
155 | ret = -EINVAL; | |
156 | } | |
157 | ||
158 | return ret; | |
159 | } | |
160 | ||
ed5514c9 | 161 | static const struct iio_info als_info = { |
162 | .driver_module = THIS_MODULE, | |
163 | .read_raw = &als_read_raw, | |
164 | .write_raw = &als_write_raw, | |
ed5514c9 | 165 | }; |
166 | ||
167 | /* Function to push data to buffer */ | |
8c60c7e7 LPC |
168 | static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data, |
169 | int len) | |
ed5514c9 | 170 | { |
ed5514c9 | 171 | dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); |
8c60c7e7 | 172 | iio_push_to_buffers(indio_dev, data); |
ed5514c9 | 173 | } |
174 | ||
175 | /* Callback handler to send event after all samples are received and captured */ | |
176 | static int als_proc_event(struct hid_sensor_hub_device *hsdev, | |
177 | unsigned usage_id, | |
178 | void *priv) | |
179 | { | |
180 | struct iio_dev *indio_dev = platform_get_drvdata(priv); | |
181 | struct als_state *als_state = iio_priv(indio_dev); | |
182 | ||
56ff6be6 SP |
183 | dev_dbg(&indio_dev->dev, "als_proc_event\n"); |
184 | if (atomic_read(&als_state->common_attributes.data_ready)) | |
ed5514c9 | 185 | hid_sensor_push_data(indio_dev, |
8c60c7e7 | 186 | &als_state->illum, |
ed5514c9 | 187 | sizeof(als_state->illum)); |
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
192 | /* Capture samples in local storage */ | |
193 | static int als_capture_sample(struct hid_sensor_hub_device *hsdev, | |
194 | unsigned usage_id, | |
195 | size_t raw_len, char *raw_data, | |
196 | void *priv) | |
197 | { | |
198 | struct iio_dev *indio_dev = platform_get_drvdata(priv); | |
199 | struct als_state *als_state = iio_priv(indio_dev); | |
200 | int ret = -EINVAL; | |
201 | ||
202 | switch (usage_id) { | |
203 | case HID_USAGE_SENSOR_LIGHT_ILLUM: | |
204 | als_state->illum = *(u32 *)raw_data; | |
205 | ret = 0; | |
206 | break; | |
207 | default: | |
208 | break; | |
209 | } | |
210 | ||
211 | return ret; | |
212 | } | |
213 | ||
214 | /* Parse report which is specific to an usage id*/ | |
215 | static int als_parse_report(struct platform_device *pdev, | |
216 | struct hid_sensor_hub_device *hsdev, | |
217 | struct iio_chan_spec *channels, | |
218 | unsigned usage_id, | |
219 | struct als_state *st) | |
220 | { | |
221 | int ret; | |
222 | ||
223 | ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT, | |
224 | usage_id, | |
225 | HID_USAGE_SENSOR_LIGHT_ILLUM, | |
226 | &st->als_illum); | |
227 | if (ret < 0) | |
228 | return ret; | |
229 | als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_ILLUM, | |
230 | st->als_illum.size); | |
231 | ||
232 | dev_dbg(&pdev->dev, "als %x:%x\n", st->als_illum.index, | |
233 | st->als_illum.report_id); | |
234 | ||
36783d09 SP |
235 | st->scale_precision = hid_sensor_format_scale( |
236 | HID_USAGE_SENSOR_ALS, | |
237 | &st->als_illum, | |
238 | &st->scale_pre_decml, &st->scale_post_decml); | |
239 | ||
f87ee1bd SP |
240 | /* Set Sensitivity field ids, when there is no individual modifier */ |
241 | if (st->common_attributes.sensitivity.index < 0) { | |
242 | sensor_hub_input_get_attribute_info(hsdev, | |
243 | HID_FEATURE_REPORT, usage_id, | |
244 | HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS | | |
245 | HID_USAGE_SENSOR_DATA_LIGHT, | |
246 | &st->common_attributes.sensitivity); | |
247 | dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n", | |
248 | st->common_attributes.sensitivity.index, | |
249 | st->common_attributes.sensitivity.report_id); | |
250 | } | |
ed5514c9 | 251 | return ret; |
252 | } | |
253 | ||
254 | /* Function to initialize the processing for usage id */ | |
fc52692c | 255 | static int hid_als_probe(struct platform_device *pdev) |
ed5514c9 | 256 | { |
257 | int ret = 0; | |
258 | static const char *name = "als"; | |
259 | struct iio_dev *indio_dev; | |
260 | struct als_state *als_state; | |
261 | struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; | |
262 | struct iio_chan_spec *channels; | |
263 | ||
47aff92c SK |
264 | indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct als_state)); |
265 | if (!indio_dev) | |
266 | return -ENOMEM; | |
ed5514c9 | 267 | platform_set_drvdata(pdev, indio_dev); |
268 | ||
269 | als_state = iio_priv(indio_dev); | |
270 | als_state->common_attributes.hsdev = hsdev; | |
271 | als_state->common_attributes.pdev = pdev; | |
272 | ||
273 | ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_ALS, | |
274 | &als_state->common_attributes); | |
275 | if (ret) { | |
276 | dev_err(&pdev->dev, "failed to setup common attributes\n"); | |
47aff92c | 277 | return ret; |
ed5514c9 | 278 | } |
279 | ||
64ebe955 | 280 | channels = kmemdup(als_channels, sizeof(als_channels), GFP_KERNEL); |
ed5514c9 | 281 | if (!channels) { |
282 | dev_err(&pdev->dev, "failed to duplicate channels\n"); | |
47aff92c | 283 | return -ENOMEM; |
ed5514c9 | 284 | } |
285 | ||
286 | ret = als_parse_report(pdev, hsdev, channels, | |
287 | HID_USAGE_SENSOR_ALS, als_state); | |
288 | if (ret) { | |
289 | dev_err(&pdev->dev, "failed to setup attributes\n"); | |
290 | goto error_free_dev_mem; | |
291 | } | |
292 | ||
293 | indio_dev->channels = channels; | |
294 | indio_dev->num_channels = | |
295 | ARRAY_SIZE(als_channels); | |
296 | indio_dev->dev.parent = &pdev->dev; | |
297 | indio_dev->info = &als_info; | |
298 | indio_dev->name = name; | |
299 | indio_dev->modes = INDIO_DIRECT_MODE; | |
300 | ||
301 | ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, | |
302 | NULL, NULL); | |
303 | if (ret) { | |
304 | dev_err(&pdev->dev, "failed to initialize trigger buffer\n"); | |
305 | goto error_free_dev_mem; | |
306 | } | |
56ff6be6 | 307 | atomic_set(&als_state->common_attributes.data_ready, 0); |
ed5514c9 | 308 | ret = hid_sensor_setup_trigger(indio_dev, name, |
309 | &als_state->common_attributes); | |
310 | if (ret < 0) { | |
311 | dev_err(&pdev->dev, "trigger setup failed\n"); | |
312 | goto error_unreg_buffer_funcs; | |
313 | } | |
314 | ||
315 | ret = iio_device_register(indio_dev); | |
316 | if (ret) { | |
317 | dev_err(&pdev->dev, "device register failed\n"); | |
318 | goto error_remove_trigger; | |
319 | } | |
320 | ||
321 | als_state->callbacks.send_event = als_proc_event; | |
322 | als_state->callbacks.capture_sample = als_capture_sample; | |
323 | als_state->callbacks.pdev = pdev; | |
324 | ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ALS, | |
325 | &als_state->callbacks); | |
326 | if (ret < 0) { | |
327 | dev_err(&pdev->dev, "callback reg failed\n"); | |
328 | goto error_iio_unreg; | |
329 | } | |
330 | ||
331 | return ret; | |
332 | ||
333 | error_iio_unreg: | |
334 | iio_device_unregister(indio_dev); | |
335 | error_remove_trigger: | |
ec7f68e0 | 336 | hid_sensor_remove_trigger(&als_state->common_attributes); |
ed5514c9 | 337 | error_unreg_buffer_funcs: |
338 | iio_triggered_buffer_cleanup(indio_dev); | |
339 | error_free_dev_mem: | |
340 | kfree(indio_dev->channels); | |
ed5514c9 | 341 | return ret; |
342 | } | |
343 | ||
344 | /* Function to deinitialize the processing for usage id */ | |
fc52692c | 345 | static int hid_als_remove(struct platform_device *pdev) |
ed5514c9 | 346 | { |
347 | struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; | |
348 | struct iio_dev *indio_dev = platform_get_drvdata(pdev); | |
ec7f68e0 | 349 | struct als_state *als_state = iio_priv(indio_dev); |
ed5514c9 | 350 | |
351 | sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ALS); | |
352 | iio_device_unregister(indio_dev); | |
ec7f68e0 | 353 | hid_sensor_remove_trigger(&als_state->common_attributes); |
ed5514c9 | 354 | iio_triggered_buffer_cleanup(indio_dev); |
355 | kfree(indio_dev->channels); | |
ed5514c9 | 356 | |
357 | return 0; | |
358 | } | |
359 | ||
5b812ea5 AH |
360 | static struct platform_device_id hid_als_ids[] = { |
361 | { | |
362 | /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ | |
363 | .name = "HID-SENSOR-200041", | |
364 | }, | |
365 | { /* sentinel */ } | |
366 | }; | |
367 | MODULE_DEVICE_TABLE(platform, hid_als_ids); | |
368 | ||
ed5514c9 | 369 | static struct platform_driver hid_als_platform_driver = { |
5b812ea5 | 370 | .id_table = hid_als_ids, |
ed5514c9 | 371 | .driver = { |
5b812ea5 | 372 | .name = KBUILD_MODNAME, |
ed5514c9 | 373 | .owner = THIS_MODULE, |
374 | }, | |
375 | .probe = hid_als_probe, | |
376 | .remove = hid_als_remove, | |
377 | }; | |
378 | module_platform_driver(hid_als_platform_driver); | |
379 | ||
380 | MODULE_DESCRIPTION("HID Sensor ALS"); | |
381 | MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>"); | |
382 | MODULE_LICENSE("GPL"); |