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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
34#define CHANNEL_SCAN_INDEX_ILLUM 0
35
36struct als_state {
37 struct hid_sensor_hub_callbacks callbacks;
38 struct hid_sensor_common common_attributes;
39 struct hid_sensor_hub_attribute_info als_illum;
40 u32 illum;
41 int scale_pre_decml;
42 int scale_post_decml;
43 int scale_precision;
44 int value_offset;
45};
46
47
48static const struct iio_chan_spec als_channels[] = {
49 {
50 .type = IIO_INTENSITY,
51 .modified = 1,
52 .channel2 = IIO_MOD_LIGHT_BOTH,
53 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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),
58 .scan_index = CHANNEL_SCAN_INDEX_ILLUM,
59 }
60};
61
62
63static 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
68 channels[channel].scan_type.realbits = size * 8;
69
70 channels[channel].scan_type.storagebits = sizeof(u32) * 8;
71}
72
73
74static 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;
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 }
98 if (report_id >= 0) {
99 hid_sensor_power_state(&als_state->common_attributes,
100 true);
101 *val = sensor_hub_input_attr_get_raw_value(
102 als_state->common_attributes.hsdev,
103 HID_USAGE_SENSOR_ALS, address,
104 report_id,
105 SENSOR_HUB_SYNC);
106 hid_sensor_power_state(&als_state->common_attributes,
107 false);
108 } else {
109 *val = 0;
110 return -EINVAL;
111 }
112 ret_type = IIO_VAL_INT;
113 break;
114 case IIO_CHAN_INFO_SCALE:
115 *val = als_state->scale_pre_decml;
116 *val2 = als_state->scale_post_decml;
117 ret_type = als_state->scale_precision;
118 break;
119 case IIO_CHAN_INFO_OFFSET:
120 *val = als_state->value_offset;
121 ret_type = IIO_VAL_INT;
122 break;
123 case IIO_CHAN_INFO_SAMP_FREQ:
124 ret_type = hid_sensor_read_samp_freq_value(
125 &als_state->common_attributes, val, val2);
126 break;
127 case IIO_CHAN_INFO_HYSTERESIS:
128 ret_type = hid_sensor_read_raw_hyst_value(
129 &als_state->common_attributes, val, val2);
130 break;
131 default:
132 ret_type = -EINVAL;
133 break;
134 }
135
136 return ret_type;
137}
138
139
140static 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
165static const struct iio_info als_info = {
166 .driver_module = THIS_MODULE,
167 .read_raw = &als_read_raw,
168 .write_raw = &als_write_raw,
169};
170
171
172static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
173 int len)
174{
175 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
176 iio_push_to_buffers(indio_dev, data);
177}
178
179
180static 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
187 dev_dbg(&indio_dev->dev, "als_proc_event\n");
188 if (atomic_read(&als_state->common_attributes.data_ready))
189 hid_sensor_push_data(indio_dev,
190 &als_state->illum,
191 sizeof(als_state->illum));
192
193 return 0;
194}
195
196
197static 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
219static 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
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
244
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 }
255 return ret;
256}
257
258
259static int hid_als_probe(struct platform_device *pdev)
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;
266
267 indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct als_state));
268 if (!indio_dev)
269 return -ENOMEM;
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");
280 return ret;
281 }
282
283 indio_dev->channels = kmemdup(als_channels,
284 sizeof(als_channels), GFP_KERNEL);
285 if (!indio_dev->channels) {
286 dev_err(&pdev->dev, "failed to duplicate channels\n");
287 return -ENOMEM;
288 }
289
290 ret = als_parse_report(pdev, hsdev,
291 (struct iio_chan_spec *)indio_dev->channels,
292 HID_USAGE_SENSOR_ALS, als_state);
293 if (ret) {
294 dev_err(&pdev->dev, "failed to setup attributes\n");
295 goto error_free_dev_mem;
296 }
297
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 }
311 atomic_set(&als_state->common_attributes.data_ready, 0);
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
337error_iio_unreg:
338 iio_device_unregister(indio_dev);
339error_remove_trigger:
340 hid_sensor_remove_trigger(&als_state->common_attributes);
341error_unreg_buffer_funcs:
342 iio_triggered_buffer_cleanup(indio_dev);
343error_free_dev_mem:
344 kfree(indio_dev->channels);
345 return ret;
346}
347
348
349static int hid_als_remove(struct platform_device *pdev)
350{
351 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
352 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
353 struct als_state *als_state = iio_priv(indio_dev);
354
355 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ALS);
356 iio_device_unregister(indio_dev);
357 hid_sensor_remove_trigger(&als_state->common_attributes);
358 iio_triggered_buffer_cleanup(indio_dev);
359 kfree(indio_dev->channels);
360
361 return 0;
362}
363
364static const struct platform_device_id hid_als_ids[] = {
365 {
366
367 .name = "HID-SENSOR-200041",
368 },
369 { }
370};
371MODULE_DEVICE_TABLE(platform, hid_als_ids);
372
373static struct platform_driver hid_als_platform_driver = {
374 .id_table = hid_als_ids,
375 .driver = {
376 .name = KBUILD_MODNAME,
377 .pm = &hid_sensor_pm_ops,
378 },
379 .probe = hid_als_probe,
380 .remove = hid_als_remove,
381};
382module_platform_driver(hid_als_platform_driver);
383
384MODULE_DESCRIPTION("HID Sensor ALS");
385MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
386MODULE_LICENSE("GPL");
387
