1
2
3
4
5
6#include <linux/device.h>
7#include <linux/platform_device.h>
8#include <linux/module.h>
9#include <linux/interrupt.h>
10#include <linux/irq.h>
11#include <linux/slab.h>
12#include <linux/delay.h>
13#include <linux/hid-sensor-hub.h>
14#include <linux/iio/iio.h>
15#include <linux/iio/sysfs.h>
16#include <linux/iio/buffer.h>
17#include <linux/iio/trigger_consumer.h>
18#include <linux/iio/triggered_buffer.h>
19#include "../common/hid-sensors/hid-sensor-trigger.h"
20
21#define CHANNEL_SCAN_INDEX_PRESSURE 0
22
23struct press_state {
24 struct hid_sensor_hub_callbacks callbacks;
25 struct hid_sensor_common common_attributes;
26 struct hid_sensor_hub_attribute_info press_attr;
27 u32 press_data;
28 int scale_pre_decml;
29 int scale_post_decml;
30 int scale_precision;
31 int value_offset;
32};
33
34
35static const struct iio_chan_spec press_channels[] = {
36 {
37 .type = IIO_PRESSURE,
38 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
39 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
40 BIT(IIO_CHAN_INFO_SCALE) |
41 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
42 BIT(IIO_CHAN_INFO_HYSTERESIS),
43 .scan_index = CHANNEL_SCAN_INDEX_PRESSURE,
44 }
45};
46
47
48static void press_adjust_channel_bit_mask(struct iio_chan_spec *channels,
49 int channel, int size)
50{
51 channels[channel].scan_type.sign = 's';
52
53 channels[channel].scan_type.realbits = size * 8;
54
55 channels[channel].scan_type.storagebits = sizeof(u32) * 8;
56}
57
58
59static int press_read_raw(struct iio_dev *indio_dev,
60 struct iio_chan_spec const *chan,
61 int *val, int *val2,
62 long mask)
63{
64 struct press_state *press_state = iio_priv(indio_dev);
65 int report_id = -1;
66 u32 address;
67 int ret_type;
68 s32 min;
69
70 *val = 0;
71 *val2 = 0;
72 switch (mask) {
73 case IIO_CHAN_INFO_RAW:
74 switch (chan->scan_index) {
75 case CHANNEL_SCAN_INDEX_PRESSURE:
76 report_id = press_state->press_attr.report_id;
77 min = press_state->press_attr.logical_minimum;
78 address = HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE;
79 break;
80 default:
81 report_id = -1;
82 break;
83 }
84 if (report_id >= 0) {
85 hid_sensor_power_state(&press_state->common_attributes,
86 true);
87 *val = sensor_hub_input_attr_get_raw_value(
88 press_state->common_attributes.hsdev,
89 HID_USAGE_SENSOR_PRESSURE, address,
90 report_id,
91 SENSOR_HUB_SYNC,
92 min < 0);
93 hid_sensor_power_state(&press_state->common_attributes,
94 false);
95 } else {
96 *val = 0;
97 return -EINVAL;
98 }
99 ret_type = IIO_VAL_INT;
100 break;
101 case IIO_CHAN_INFO_SCALE:
102 *val = press_state->scale_pre_decml;
103 *val2 = press_state->scale_post_decml;
104 ret_type = press_state->scale_precision;
105 break;
106 case IIO_CHAN_INFO_OFFSET:
107 *val = press_state->value_offset;
108 ret_type = IIO_VAL_INT;
109 break;
110 case IIO_CHAN_INFO_SAMP_FREQ:
111 ret_type = hid_sensor_read_samp_freq_value(
112 &press_state->common_attributes, val, val2);
113 break;
114 case IIO_CHAN_INFO_HYSTERESIS:
115 ret_type = hid_sensor_read_raw_hyst_value(
116 &press_state->common_attributes, val, val2);
117 break;
118 default:
119 ret_type = -EINVAL;
120 break;
121 }
122
123 return ret_type;
124}
125
126
127static int press_write_raw(struct iio_dev *indio_dev,
128 struct iio_chan_spec const *chan,
129 int val,
130 int val2,
131 long mask)
132{
133 struct press_state *press_state = iio_priv(indio_dev);
134 int ret = 0;
135
136 switch (mask) {
137 case IIO_CHAN_INFO_SAMP_FREQ:
138 ret = hid_sensor_write_samp_freq_value(
139 &press_state->common_attributes, val, val2);
140 break;
141 case IIO_CHAN_INFO_HYSTERESIS:
142 ret = hid_sensor_write_raw_hyst_value(
143 &press_state->common_attributes, val, val2);
144 break;
145 default:
146 ret = -EINVAL;
147 }
148
149 return ret;
150}
151
152static const struct iio_info press_info = {
153 .read_raw = &press_read_raw,
154 .write_raw = &press_write_raw,
155};
156
157
158static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
159 int len)
160{
161 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
162 iio_push_to_buffers(indio_dev, data);
163}
164
165
166static int press_proc_event(struct hid_sensor_hub_device *hsdev,
167 unsigned usage_id,
168 void *priv)
169{
170 struct iio_dev *indio_dev = platform_get_drvdata(priv);
171 struct press_state *press_state = iio_priv(indio_dev);
172
173 dev_dbg(&indio_dev->dev, "press_proc_event\n");
174 if (atomic_read(&press_state->common_attributes.data_ready))
175 hid_sensor_push_data(indio_dev,
176 &press_state->press_data,
177 sizeof(press_state->press_data));
178
179 return 0;
180}
181
182
183static int press_capture_sample(struct hid_sensor_hub_device *hsdev,
184 unsigned usage_id,
185 size_t raw_len, char *raw_data,
186 void *priv)
187{
188 struct iio_dev *indio_dev = platform_get_drvdata(priv);
189 struct press_state *press_state = iio_priv(indio_dev);
190 int ret = -EINVAL;
191
192 switch (usage_id) {
193 case HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE:
194 press_state->press_data = *(u32 *)raw_data;
195 ret = 0;
196 break;
197 default:
198 break;
199 }
200
201 return ret;
202}
203
204
205static int press_parse_report(struct platform_device *pdev,
206 struct hid_sensor_hub_device *hsdev,
207 struct iio_chan_spec *channels,
208 unsigned usage_id,
209 struct press_state *st)
210{
211 int ret;
212
213 ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
214 usage_id,
215 HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE,
216 &st->press_attr);
217 if (ret < 0)
218 return ret;
219 press_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESSURE,
220 st->press_attr.size);
221
222 dev_dbg(&pdev->dev, "press %x:%x\n", st->press_attr.index,
223 st->press_attr.report_id);
224
225 st->scale_precision = hid_sensor_format_scale(
226 HID_USAGE_SENSOR_PRESSURE,
227 &st->press_attr,
228 &st->scale_pre_decml, &st->scale_post_decml);
229
230
231 if (st->common_attributes.sensitivity.index < 0) {
232 sensor_hub_input_get_attribute_info(hsdev,
233 HID_FEATURE_REPORT, usage_id,
234 HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
235 HID_USAGE_SENSOR_DATA_ATMOSPHERIC_PRESSURE,
236 &st->common_attributes.sensitivity);
237 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
238 st->common_attributes.sensitivity.index,
239 st->common_attributes.sensitivity.report_id);
240 }
241 return ret;
242}
243
244
245static int hid_press_probe(struct platform_device *pdev)
246{
247 int ret = 0;
248 static const char *name = "press";
249 struct iio_dev *indio_dev;
250 struct press_state *press_state;
251 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
252
253 indio_dev = devm_iio_device_alloc(&pdev->dev,
254 sizeof(struct press_state));
255 if (!indio_dev)
256 return -ENOMEM;
257 platform_set_drvdata(pdev, indio_dev);
258
259 press_state = iio_priv(indio_dev);
260 press_state->common_attributes.hsdev = hsdev;
261 press_state->common_attributes.pdev = pdev;
262
263 ret = hid_sensor_parse_common_attributes(hsdev,
264 HID_USAGE_SENSOR_PRESSURE,
265 &press_state->common_attributes);
266 if (ret) {
267 dev_err(&pdev->dev, "failed to setup common attributes\n");
268 return ret;
269 }
270
271 indio_dev->channels = kmemdup(press_channels, sizeof(press_channels),
272 GFP_KERNEL);
273 if (!indio_dev->channels) {
274 dev_err(&pdev->dev, "failed to duplicate channels\n");
275 return -ENOMEM;
276 }
277
278 ret = press_parse_report(pdev, hsdev,
279 (struct iio_chan_spec *)indio_dev->channels,
280 HID_USAGE_SENSOR_PRESSURE, press_state);
281 if (ret) {
282 dev_err(&pdev->dev, "failed to setup attributes\n");
283 goto error_free_dev_mem;
284 }
285
286 indio_dev->num_channels =
287 ARRAY_SIZE(press_channels);
288 indio_dev->dev.parent = &pdev->dev;
289 indio_dev->info = &press_info;
290 indio_dev->name = name;
291 indio_dev->modes = INDIO_DIRECT_MODE;
292
293 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
294 NULL, NULL);
295 if (ret) {
296 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
297 goto error_free_dev_mem;
298 }
299 atomic_set(&press_state->common_attributes.data_ready, 0);
300 ret = hid_sensor_setup_trigger(indio_dev, name,
301 &press_state->common_attributes);
302 if (ret) {
303 dev_err(&pdev->dev, "trigger setup failed\n");
304 goto error_unreg_buffer_funcs;
305 }
306
307 ret = iio_device_register(indio_dev);
308 if (ret) {
309 dev_err(&pdev->dev, "device register failed\n");
310 goto error_remove_trigger;
311 }
312
313 press_state->callbacks.send_event = press_proc_event;
314 press_state->callbacks.capture_sample = press_capture_sample;
315 press_state->callbacks.pdev = pdev;
316 ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PRESSURE,
317 &press_state->callbacks);
318 if (ret < 0) {
319 dev_err(&pdev->dev, "callback reg failed\n");
320 goto error_iio_unreg;
321 }
322
323 return ret;
324
325error_iio_unreg:
326 iio_device_unregister(indio_dev);
327error_remove_trigger:
328 hid_sensor_remove_trigger(&press_state->common_attributes);
329error_unreg_buffer_funcs:
330 iio_triggered_buffer_cleanup(indio_dev);
331error_free_dev_mem:
332 kfree(indio_dev->channels);
333 return ret;
334}
335
336
337static int hid_press_remove(struct platform_device *pdev)
338{
339 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
340 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
341 struct press_state *press_state = iio_priv(indio_dev);
342
343 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PRESSURE);
344 iio_device_unregister(indio_dev);
345 hid_sensor_remove_trigger(&press_state->common_attributes);
346 iio_triggered_buffer_cleanup(indio_dev);
347 kfree(indio_dev->channels);
348
349 return 0;
350}
351
352static const struct platform_device_id hid_press_ids[] = {
353 {
354
355 .name = "HID-SENSOR-200031",
356 },
357 { }
358};
359MODULE_DEVICE_TABLE(platform, hid_press_ids);
360
361static struct platform_driver hid_press_platform_driver = {
362 .id_table = hid_press_ids,
363 .driver = {
364 .name = KBUILD_MODNAME,
365 .pm = &hid_sensor_pm_ops,
366 },
367 .probe = hid_press_probe,
368 .remove = hid_press_remove,
369};
370module_platform_driver(hid_press_platform_driver);
371
372MODULE_DESCRIPTION("HID Sensor Pressure");
373MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>");
374MODULE_LICENSE("GPL");
375
