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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 .driver_module = THIS_MODULE,
164 .read_raw = &press_read_raw,
165 .write_raw = &press_write_raw,
166};
167
168
169static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
170 int len)
171{
172 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
173 iio_push_to_buffers(indio_dev, data);
174}
175
176
177static int press_proc_event(struct hid_sensor_hub_device *hsdev,
178 unsigned usage_id,
179 void *priv)
180{
181 struct iio_dev *indio_dev = platform_get_drvdata(priv);
182 struct press_state *press_state = iio_priv(indio_dev);
183
184 dev_dbg(&indio_dev->dev, "press_proc_event\n");
185 if (atomic_read(&press_state->common_attributes.data_ready))
186 hid_sensor_push_data(indio_dev,
187 &press_state->press_data,
188 sizeof(press_state->press_data));
189
190 return 0;
191}
192
193
194static int press_capture_sample(struct hid_sensor_hub_device *hsdev,
195 unsigned usage_id,
196 size_t raw_len, char *raw_data,
197 void *priv)
198{
199 struct iio_dev *indio_dev = platform_get_drvdata(priv);
200 struct press_state *press_state = iio_priv(indio_dev);
201 int ret = -EINVAL;
202
203 switch (usage_id) {
204 case HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE:
205 press_state->press_data = *(u32 *)raw_data;
206 ret = 0;
207 break;
208 default:
209 break;
210 }
211
212 return ret;
213}
214
215
216static int press_parse_report(struct platform_device *pdev,
217 struct hid_sensor_hub_device *hsdev,
218 struct iio_chan_spec *channels,
219 unsigned usage_id,
220 struct press_state *st)
221{
222 int ret;
223
224 ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
225 usage_id,
226 HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE,
227 &st->press_attr);
228 if (ret < 0)
229 return ret;
230 press_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESSURE,
231 st->press_attr.size);
232
233 dev_dbg(&pdev->dev, "press %x:%x\n", st->press_attr.index,
234 st->press_attr.report_id);
235
236 st->scale_precision = hid_sensor_format_scale(
237 HID_USAGE_SENSOR_PRESSURE,
238 &st->press_attr,
239 &st->scale_pre_decml, &st->scale_post_decml);
240
241
242 if (st->common_attributes.sensitivity.index < 0) {
243 sensor_hub_input_get_attribute_info(hsdev,
244 HID_FEATURE_REPORT, usage_id,
245 HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
246 HID_USAGE_SENSOR_DATA_ATMOSPHERIC_PRESSURE,
247 &st->common_attributes.sensitivity);
248 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
249 st->common_attributes.sensitivity.index,
250 st->common_attributes.sensitivity.report_id);
251 }
252 return ret;
253}
254
255
256static int hid_press_probe(struct platform_device *pdev)
257{
258 int ret = 0;
259 static const char *name = "press";
260 struct iio_dev *indio_dev;
261 struct press_state *press_state;
262 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
263
264 indio_dev = devm_iio_device_alloc(&pdev->dev,
265 sizeof(struct press_state));
266 if (!indio_dev)
267 return -ENOMEM;
268 platform_set_drvdata(pdev, indio_dev);
269
270 press_state = iio_priv(indio_dev);
271 press_state->common_attributes.hsdev = hsdev;
272 press_state->common_attributes.pdev = pdev;
273
274 ret = hid_sensor_parse_common_attributes(hsdev,
275 HID_USAGE_SENSOR_PRESSURE,
276 &press_state->common_attributes);
277 if (ret) {
278 dev_err(&pdev->dev, "failed to setup common attributes\n");
279 return ret;
280 }
281
282 indio_dev->channels = kmemdup(press_channels, sizeof(press_channels),
283 GFP_KERNEL);
284 if (!indio_dev->channels) {
285 dev_err(&pdev->dev, "failed to duplicate channels\n");
286 return -ENOMEM;
287 }
288
289 ret = press_parse_report(pdev, hsdev,
290 (struct iio_chan_spec *)indio_dev->channels,
291 HID_USAGE_SENSOR_PRESSURE, press_state);
292 if (ret) {
293 dev_err(&pdev->dev, "failed to setup attributes\n");
294 goto error_free_dev_mem;
295 }
296
297 indio_dev->num_channels =
298 ARRAY_SIZE(press_channels);
299 indio_dev->dev.parent = &pdev->dev;
300 indio_dev->info = &press_info;
301 indio_dev->name = name;
302 indio_dev->modes = INDIO_DIRECT_MODE;
303
304 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
305 NULL, NULL);
306 if (ret) {
307 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
308 goto error_free_dev_mem;
309 }
310 atomic_set(&press_state->common_attributes.data_ready, 0);
311 ret = hid_sensor_setup_trigger(indio_dev, name,
312 &press_state->common_attributes);
313 if (ret) {
314 dev_err(&pdev->dev, "trigger setup failed\n");
315 goto error_unreg_buffer_funcs;
316 }
317
318 ret = iio_device_register(indio_dev);
319 if (ret) {
320 dev_err(&pdev->dev, "device register failed\n");
321 goto error_remove_trigger;
322 }
323
324 press_state->callbacks.send_event = press_proc_event;
325 press_state->callbacks.capture_sample = press_capture_sample;
326 press_state->callbacks.pdev = pdev;
327 ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PRESSURE,
328 &press_state->callbacks);
329 if (ret < 0) {
330 dev_err(&pdev->dev, "callback reg failed\n");
331 goto error_iio_unreg;
332 }
333
334 return ret;
335
336error_iio_unreg:
337 iio_device_unregister(indio_dev);
338error_remove_trigger:
339 hid_sensor_remove_trigger(&press_state->common_attributes);
340error_unreg_buffer_funcs:
341 iio_triggered_buffer_cleanup(indio_dev);
342error_free_dev_mem:
343 kfree(indio_dev->channels);
344 return ret;
345}
346
347
348static int hid_press_remove(struct platform_device *pdev)
349{
350 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
351 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
352 struct press_state *press_state = iio_priv(indio_dev);
353
354 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PRESSURE);
355 iio_device_unregister(indio_dev);
356 hid_sensor_remove_trigger(&press_state->common_attributes);
357 iio_triggered_buffer_cleanup(indio_dev);
358 kfree(indio_dev->channels);
359
360 return 0;
361}
362
363static const struct platform_device_id hid_press_ids[] = {
364 {
365
366 .name = "HID-SENSOR-200031",
367 },
368 { }
369};
370MODULE_DEVICE_TABLE(platform, hid_press_ids);
371
372static struct platform_driver hid_press_platform_driver = {
373 .id_table = hid_press_ids,
374 .driver = {
375 .name = KBUILD_MODNAME,
376 .pm = &hid_sensor_pm_ops,
377 },
378 .probe = hid_press_probe,
379 .remove = hid_press_remove,
380};
381module_platform_driver(hid_press_platform_driver);
382
383MODULE_DESCRIPTION("HID Sensor Pressure");
384MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>");
385MODULE_LICENSE("GPL");
386
