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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/delay.h>
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>
32#include "../common/hid-sensors/hid-sensor-trigger.h"
33
34enum {
35 CHANNEL_SCAN_INDEX_INTENSITY = 0,
36 CHANNEL_SCAN_INDEX_ILLUM = 1,
37 CHANNEL_SCAN_INDEX_MAX
38};
39
40struct als_state {
41 struct hid_sensor_hub_callbacks callbacks;
42 struct hid_sensor_common common_attributes;
43 struct hid_sensor_hub_attribute_info als_illum;
44 u32 illum[CHANNEL_SCAN_INDEX_MAX];
45 int scale_pre_decml;
46 int scale_post_decml;
47 int scale_precision;
48 int value_offset;
49};
50
51
52static const struct iio_chan_spec als_channels[] = {
53 {
54 .type = IIO_INTENSITY,
55 .modified = 1,
56 .channel2 = IIO_MOD_LIGHT_BOTH,
57 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
58 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
59 BIT(IIO_CHAN_INFO_SCALE) |
60 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
61 BIT(IIO_CHAN_INFO_HYSTERESIS),
62 .scan_index = CHANNEL_SCAN_INDEX_INTENSITY,
63 },
64 {
65 .type = IIO_LIGHT,
66 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
67 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
68 BIT(IIO_CHAN_INFO_SCALE) |
69 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
70 BIT(IIO_CHAN_INFO_HYSTERESIS),
71 .scan_index = CHANNEL_SCAN_INDEX_ILLUM,
72 }
73};
74
75
76static void als_adjust_channel_bit_mask(struct iio_chan_spec *channels,
77 int channel, int size)
78{
79 channels[channel].scan_type.sign = 's';
80
81 channels[channel].scan_type.realbits = size * 8;
82
83 channels[channel].scan_type.storagebits = sizeof(u32) * 8;
84}
85
86
87static int als_read_raw(struct iio_dev *indio_dev,
88 struct iio_chan_spec const *chan,
89 int *val, int *val2,
90 long mask)
91{
92 struct als_state *als_state = iio_priv(indio_dev);
93 int report_id = -1;
94 u32 address;
95 int ret_type;
96
97 *val = 0;
98 *val2 = 0;
99 switch (mask) {
100 case IIO_CHAN_INFO_RAW:
101 switch (chan->scan_index) {
102 case CHANNEL_SCAN_INDEX_INTENSITY:
103 case CHANNEL_SCAN_INDEX_ILLUM:
104 report_id = als_state->als_illum.report_id;
105 address =
106 HID_USAGE_SENSOR_LIGHT_ILLUM;
107 break;
108 default:
109 report_id = -1;
110 break;
111 }
112 if (report_id >= 0) {
113 hid_sensor_power_state(&als_state->common_attributes,
114 true);
115 *val = sensor_hub_input_attr_get_raw_value(
116 als_state->common_attributes.hsdev,
117 HID_USAGE_SENSOR_ALS, address,
118 report_id,
119 SENSOR_HUB_SYNC);
120 hid_sensor_power_state(&als_state->common_attributes,
121 false);
122 } else {
123 *val = 0;
124 return -EINVAL;
125 }
126 ret_type = IIO_VAL_INT;
127 break;
128 case IIO_CHAN_INFO_SCALE:
129 *val = als_state->scale_pre_decml;
130 *val2 = als_state->scale_post_decml;
131 ret_type = als_state->scale_precision;
132 break;
133 case IIO_CHAN_INFO_OFFSET:
134 *val = als_state->value_offset;
135 ret_type = IIO_VAL_INT;
136 break;
137 case IIO_CHAN_INFO_SAMP_FREQ:
138 ret_type = hid_sensor_read_samp_freq_value(
139 &als_state->common_attributes, val, val2);
140 break;
141 case IIO_CHAN_INFO_HYSTERESIS:
142 ret_type = hid_sensor_read_raw_hyst_value(
143 &als_state->common_attributes, val, val2);
144 break;
145 default:
146 ret_type = -EINVAL;
147 break;
148 }
149
150 return ret_type;
151}
152
153
154static int als_write_raw(struct iio_dev *indio_dev,
155 struct iio_chan_spec const *chan,
156 int val,
157 int val2,
158 long mask)
159{
160 struct als_state *als_state = iio_priv(indio_dev);
161 int ret = 0;
162
163 switch (mask) {
164 case IIO_CHAN_INFO_SAMP_FREQ:
165 ret = hid_sensor_write_samp_freq_value(
166 &als_state->common_attributes, val, val2);
167 break;
168 case IIO_CHAN_INFO_HYSTERESIS:
169 ret = hid_sensor_write_raw_hyst_value(
170 &als_state->common_attributes, val, val2);
171 break;
172 default:
173 ret = -EINVAL;
174 }
175
176 return ret;
177}
178
179static const struct iio_info als_info = {
180 .read_raw = &als_read_raw,
181 .write_raw = &als_write_raw,
182};
183
184
185static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
186 int len)
187{
188 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
189 iio_push_to_buffers(indio_dev, data);
190}
191
192
193static int als_proc_event(struct hid_sensor_hub_device *hsdev,
194 unsigned usage_id,
195 void *priv)
196{
197 struct iio_dev *indio_dev = platform_get_drvdata(priv);
198 struct als_state *als_state = iio_priv(indio_dev);
199
200 dev_dbg(&indio_dev->dev, "als_proc_event\n");
201 if (atomic_read(&als_state->common_attributes.data_ready))
202 hid_sensor_push_data(indio_dev,
203 &als_state->illum,
204 sizeof(als_state->illum));
205
206 return 0;
207}
208
209
210static int als_capture_sample(struct hid_sensor_hub_device *hsdev,
211 unsigned usage_id,
212 size_t raw_len, char *raw_data,
213 void *priv)
214{
215 struct iio_dev *indio_dev = platform_get_drvdata(priv);
216 struct als_state *als_state = iio_priv(indio_dev);
217 int ret = -EINVAL;
218 u32 sample_data = *(u32 *)raw_data;
219
220 switch (usage_id) {
221 case HID_USAGE_SENSOR_LIGHT_ILLUM:
222 als_state->illum[CHANNEL_SCAN_INDEX_INTENSITY] = sample_data;
223 als_state->illum[CHANNEL_SCAN_INDEX_ILLUM] = sample_data;
224 ret = 0;
225 break;
226 default:
227 break;
228 }
229
230 return ret;
231}
232
233
234static int als_parse_report(struct platform_device *pdev,
235 struct hid_sensor_hub_device *hsdev,
236 struct iio_chan_spec *channels,
237 unsigned usage_id,
238 struct als_state *st)
239{
240 int ret;
241
242 ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
243 usage_id,
244 HID_USAGE_SENSOR_LIGHT_ILLUM,
245 &st->als_illum);
246 if (ret < 0)
247 return ret;
248 als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_INTENSITY,
249 st->als_illum.size);
250 als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_ILLUM,
251 st->als_illum.size);
252
253 dev_dbg(&pdev->dev, "als %x:%x\n", st->als_illum.index,
254 st->als_illum.report_id);
255
256 st->scale_precision = hid_sensor_format_scale(
257 HID_USAGE_SENSOR_ALS,
258 &st->als_illum,
259 &st->scale_pre_decml, &st->scale_post_decml);
260
261
262 if (st->common_attributes.sensitivity.index < 0) {
263 sensor_hub_input_get_attribute_info(hsdev,
264 HID_FEATURE_REPORT, usage_id,
265 HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
266 HID_USAGE_SENSOR_DATA_LIGHT,
267 &st->common_attributes.sensitivity);
268 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
269 st->common_attributes.sensitivity.index,
270 st->common_attributes.sensitivity.report_id);
271 }
272 return ret;
273}
274
275
276static int hid_als_probe(struct platform_device *pdev)
277{
278 int ret = 0;
279 static const char *name = "als";
280 struct iio_dev *indio_dev;
281 struct als_state *als_state;
282 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
283
284 indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct als_state));
285 if (!indio_dev)
286 return -ENOMEM;
287 platform_set_drvdata(pdev, indio_dev);
288
289 als_state = iio_priv(indio_dev);
290 als_state->common_attributes.hsdev = hsdev;
291 als_state->common_attributes.pdev = pdev;
292
293 ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_ALS,
294 &als_state->common_attributes);
295 if (ret) {
296 dev_err(&pdev->dev, "failed to setup common attributes\n");
297 return ret;
298 }
299
300 indio_dev->channels = kmemdup(als_channels,
301 sizeof(als_channels), GFP_KERNEL);
302 if (!indio_dev->channels) {
303 dev_err(&pdev->dev, "failed to duplicate channels\n");
304 return -ENOMEM;
305 }
306
307 ret = als_parse_report(pdev, hsdev,
308 (struct iio_chan_spec *)indio_dev->channels,
309 HID_USAGE_SENSOR_ALS, als_state);
310 if (ret) {
311 dev_err(&pdev->dev, "failed to setup attributes\n");
312 goto error_free_dev_mem;
313 }
314
315 indio_dev->num_channels =
316 ARRAY_SIZE(als_channels);
317 indio_dev->dev.parent = &pdev->dev;
318 indio_dev->info = &als_info;
319 indio_dev->name = name;
320 indio_dev->modes = INDIO_DIRECT_MODE;
321
322 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
323 NULL, NULL);
324 if (ret) {
325 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
326 goto error_free_dev_mem;
327 }
328 atomic_set(&als_state->common_attributes.data_ready, 0);
329 ret = hid_sensor_setup_trigger(indio_dev, name,
330 &als_state->common_attributes);
331 if (ret < 0) {
332 dev_err(&pdev->dev, "trigger setup failed\n");
333 goto error_unreg_buffer_funcs;
334 }
335
336 ret = iio_device_register(indio_dev);
337 if (ret) {
338 dev_err(&pdev->dev, "device register failed\n");
339 goto error_remove_trigger;
340 }
341
342 als_state->callbacks.send_event = als_proc_event;
343 als_state->callbacks.capture_sample = als_capture_sample;
344 als_state->callbacks.pdev = pdev;
345 ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ALS,
346 &als_state->callbacks);
347 if (ret < 0) {
348 dev_err(&pdev->dev, "callback reg failed\n");
349 goto error_iio_unreg;
350 }
351
352 return ret;
353
354error_iio_unreg:
355 iio_device_unregister(indio_dev);
356error_remove_trigger:
357 hid_sensor_remove_trigger(&als_state->common_attributes);
358error_unreg_buffer_funcs:
359 iio_triggered_buffer_cleanup(indio_dev);
360error_free_dev_mem:
361 kfree(indio_dev->channels);
362 return ret;
363}
364
365
366static int hid_als_remove(struct platform_device *pdev)
367{
368 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
369 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
370 struct als_state *als_state = iio_priv(indio_dev);
371
372 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ALS);
373 iio_device_unregister(indio_dev);
374 hid_sensor_remove_trigger(&als_state->common_attributes);
375 iio_triggered_buffer_cleanup(indio_dev);
376 kfree(indio_dev->channels);
377
378 return 0;
379}
380
381static const struct platform_device_id hid_als_ids[] = {
382 {
383
384 .name = "HID-SENSOR-200041",
385 },
386 { }
387};
388MODULE_DEVICE_TABLE(platform, hid_als_ids);
389
390static struct platform_driver hid_als_platform_driver = {
391 .id_table = hid_als_ids,
392 .driver = {
393 .name = KBUILD_MODNAME,
394 .pm = &hid_sensor_pm_ops,
395 },
396 .probe = hid_als_probe,
397 .remove = hid_als_remove,
398};
399module_platform_driver(hid_als_platform_driver);
400
401MODULE_DESCRIPTION("HID Sensor ALS");
402MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
403MODULE_LICENSE("GPL");
404
