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18#include <linux/device.h>
19#include <linux/platform_device.h>
20#include <linux/module.h>
21#include <linux/interrupt.h>
22#include <linux/irq.h>
23#include <linux/slab.h>
24#include <linux/delay.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>
31#include "../common/hid-sensors/hid-sensor-trigger.h"
32
33#define CHANNEL_SCAN_INDEX_PRESSURE 0
34
35struct press_state {
36 struct hid_sensor_hub_callbacks callbacks;
37 struct hid_sensor_common common_attributes;
38 struct hid_sensor_hub_attribute_info press_attr;
39 u32 press_data;
40 int scale_pre_decml;
41 int scale_post_decml;
42 int scale_precision;
43 int value_offset;
44};
45
46
47static const struct iio_chan_spec press_channels[] = {
48 {
49 .type = IIO_PRESSURE,
50 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
51 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
52 BIT(IIO_CHAN_INFO_SCALE) |
53 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
54 BIT(IIO_CHAN_INFO_HYSTERESIS),
55 .scan_index = CHANNEL_SCAN_INDEX_PRESSURE,
56 }
57};
58
59
60static void press_adjust_channel_bit_mask(struct iio_chan_spec *channels,
61 int channel, int size)
62{
63 channels[channel].scan_type.sign = 's';
64
65 channels[channel].scan_type.realbits = size * 8;
66
67 channels[channel].scan_type.storagebits = sizeof(u32) * 8;
68}
69
70
71static int press_read_raw(struct iio_dev *indio_dev,
72 struct iio_chan_spec const *chan,
73 int *val, int *val2,
74 long mask)
75{
76 struct press_state *press_state = iio_priv(indio_dev);
77 int report_id = -1;
78 u32 address;
79 int ret_type;
80
81 *val = 0;
82 *val2 = 0;
83 switch (mask) {
84 case IIO_CHAN_INFO_RAW:
85 switch (chan->scan_index) {
86 case CHANNEL_SCAN_INDEX_PRESSURE:
87 report_id = press_state->press_attr.report_id;
88 address =
89 HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE;
90 break;
91 default:
92 report_id = -1;
93 break;
94 }
95 if (report_id >= 0) {
96 hid_sensor_power_state(&press_state->common_attributes,
97 true);
98 *val = sensor_hub_input_attr_get_raw_value(
99 press_state->common_attributes.hsdev,
100 HID_USAGE_SENSOR_PRESSURE, address,
101 report_id,
102 SENSOR_HUB_SYNC);
103 hid_sensor_power_state(&press_state->common_attributes,
104 false);
105 } else {
106 *val = 0;
107 return -EINVAL;
108 }
109 ret_type = IIO_VAL_INT;
110 break;
111 case IIO_CHAN_INFO_SCALE:
112 *val = press_state->scale_pre_decml;
113 *val2 = press_state->scale_post_decml;
114 ret_type = press_state->scale_precision;
115 break;
116 case IIO_CHAN_INFO_OFFSET:
117 *val = press_state->value_offset;
118 ret_type = IIO_VAL_INT;
119 break;
120 case IIO_CHAN_INFO_SAMP_FREQ:
121 ret_type = hid_sensor_read_samp_freq_value(
122 &press_state->common_attributes, val, val2);
123 break;
124 case IIO_CHAN_INFO_HYSTERESIS:
125 ret_type = hid_sensor_read_raw_hyst_value(
126 &press_state->common_attributes, val, val2);
127 break;
128 default:
129 ret_type = -EINVAL;
130 break;
131 }
132
133 return ret_type;
134}
135
136
137static int press_write_raw(struct iio_dev *indio_dev,
138 struct iio_chan_spec const *chan,
139 int val,
140 int val2,
141 long mask)
142{
143 struct press_state *press_state = iio_priv(indio_dev);
144 int ret = 0;
145
146 switch (mask) {
147 case IIO_CHAN_INFO_SAMP_FREQ:
148 ret = hid_sensor_write_samp_freq_value(
149 &press_state->common_attributes, val, val2);
150 break;
151 case IIO_CHAN_INFO_HYSTERESIS:
152 ret = hid_sensor_write_raw_hyst_value(
153 &press_state->common_attributes, val, val2);
154 break;
155 default:
156 ret = -EINVAL;
157 }
158
159 return ret;
160}
161
162static const struct iio_info press_info = {
163 .read_raw = &press_read_raw,
164 .write_raw = &press_write_raw,
165};
166
167
168static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
169 int len)
170{
171 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
172 iio_push_to_buffers(indio_dev, data);
173}
174
175
176static int press_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 press_state *press_state = iio_priv(indio_dev);
182
183 dev_dbg(&indio_dev->dev, "press_proc_event\n");
184 if (atomic_read(&press_state->common_attributes.data_ready))
185 hid_sensor_push_data(indio_dev,
186 &press_state->press_data,
187 sizeof(press_state->press_data));
188
189 return 0;
190}
191
192
193static int press_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 press_state *press_state = iio_priv(indio_dev);
200 int ret = -EINVAL;
201
202 switch (usage_id) {
203 case HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE:
204 press_state->press_data = *(u32 *)raw_data;
205 ret = 0;
206 break;
207 default:
208 break;
209 }
210
211 return ret;
212}
213
214
215static int press_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 press_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_ATMOSPHERIC_PRESSURE,
226 &st->press_attr);
227 if (ret < 0)
228 return ret;
229 press_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESSURE,
230 st->press_attr.size);
231
232 dev_dbg(&pdev->dev, "press %x:%x\n", st->press_attr.index,
233 st->press_attr.report_id);
234
235 st->scale_precision = hid_sensor_format_scale(
236 HID_USAGE_SENSOR_PRESSURE,
237 &st->press_attr,
238 &st->scale_pre_decml, &st->scale_post_decml);
239
240
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_ATMOSPHERIC_PRESSURE,
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 }
251 return ret;
252}
253
254
255static int hid_press_probe(struct platform_device *pdev)
256{
257 int ret = 0;
258 static const char *name = "press";
259 struct iio_dev *indio_dev;
260 struct press_state *press_state;
261 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
262
263 indio_dev = devm_iio_device_alloc(&pdev->dev,
264 sizeof(struct press_state));
265 if (!indio_dev)
266 return -ENOMEM;
267 platform_set_drvdata(pdev, indio_dev);
268
269 press_state = iio_priv(indio_dev);
270 press_state->common_attributes.hsdev = hsdev;
271 press_state->common_attributes.pdev = pdev;
272
273 ret = hid_sensor_parse_common_attributes(hsdev,
274 HID_USAGE_SENSOR_PRESSURE,
275 &press_state->common_attributes);
276 if (ret) {
277 dev_err(&pdev->dev, "failed to setup common attributes\n");
278 return ret;
279 }
280
281 indio_dev->channels = kmemdup(press_channels, sizeof(press_channels),
282 GFP_KERNEL);
283 if (!indio_dev->channels) {
284 dev_err(&pdev->dev, "failed to duplicate channels\n");
285 return -ENOMEM;
286 }
287
288 ret = press_parse_report(pdev, hsdev,
289 (struct iio_chan_spec *)indio_dev->channels,
290 HID_USAGE_SENSOR_PRESSURE, press_state);
291 if (ret) {
292 dev_err(&pdev->dev, "failed to setup attributes\n");
293 goto error_free_dev_mem;
294 }
295
296 indio_dev->num_channels =
297 ARRAY_SIZE(press_channels);
298 indio_dev->dev.parent = &pdev->dev;
299 indio_dev->info = &press_info;
300 indio_dev->name = name;
301 indio_dev->modes = INDIO_DIRECT_MODE;
302
303 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
304 NULL, NULL);
305 if (ret) {
306 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
307 goto error_free_dev_mem;
308 }
309 atomic_set(&press_state->common_attributes.data_ready, 0);
310 ret = hid_sensor_setup_trigger(indio_dev, name,
311 &press_state->common_attributes);
312 if (ret) {
313 dev_err(&pdev->dev, "trigger setup failed\n");
314 goto error_unreg_buffer_funcs;
315 }
316
317 ret = iio_device_register(indio_dev);
318 if (ret) {
319 dev_err(&pdev->dev, "device register failed\n");
320 goto error_remove_trigger;
321 }
322
323 press_state->callbacks.send_event = press_proc_event;
324 press_state->callbacks.capture_sample = press_capture_sample;
325 press_state->callbacks.pdev = pdev;
326 ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PRESSURE,
327 &press_state->callbacks);
328 if (ret < 0) {
329 dev_err(&pdev->dev, "callback reg failed\n");
330 goto error_iio_unreg;
331 }
332
333 return ret;
334
335error_iio_unreg:
336 iio_device_unregister(indio_dev);
337error_remove_trigger:
338 hid_sensor_remove_trigger(&press_state->common_attributes);
339error_unreg_buffer_funcs:
340 iio_triggered_buffer_cleanup(indio_dev);
341error_free_dev_mem:
342 kfree(indio_dev->channels);
343 return ret;
344}
345
346
347static int hid_press_remove(struct platform_device *pdev)
348{
349 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
350 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
351 struct press_state *press_state = iio_priv(indio_dev);
352
353 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PRESSURE);
354 iio_device_unregister(indio_dev);
355 hid_sensor_remove_trigger(&press_state->common_attributes);
356 iio_triggered_buffer_cleanup(indio_dev);
357 kfree(indio_dev->channels);
358
359 return 0;
360}
361
362static const struct platform_device_id hid_press_ids[] = {
363 {
364
365 .name = "HID-SENSOR-200031",
366 },
367 { }
368};
369MODULE_DEVICE_TABLE(platform, hid_press_ids);
370
371static struct platform_driver hid_press_platform_driver = {
372 .id_table = hid_press_ids,
373 .driver = {
374 .name = KBUILD_MODNAME,
375 .pm = &hid_sensor_pm_ops,
376 },
377 .probe = hid_press_probe,
378 .remove = hid_press_remove,
379};
380module_platform_driver(hid_press_platform_driver);
381
382MODULE_DESCRIPTION("HID Sensor Pressure");
383MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>");
384MODULE_LICENSE("GPL");
385
