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f64a799b AP |
1 | /* |
2 | * HID Sensors Driver | |
3 | * Copyright (c) 2014, Intel Corporation. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program. | |
16 | * | |
17 | */ | |
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/hid-sensor-hub.h> | |
25 | #include <linux/iio/iio.h> | |
26 | #include <linux/iio/sysfs.h> | |
27 | #include <linux/iio/buffer.h> | |
28 | #include <linux/iio/trigger_consumer.h> | |
29 | #include <linux/iio/triggered_buffer.h> | |
30 | #include "../common/hid-sensors/hid-sensor-trigger.h" | |
31 | ||
32 | #define CHANNEL_SCAN_INDEX_PRESSURE 0 | |
33 | ||
34 | struct press_state { | |
35 | struct hid_sensor_hub_callbacks callbacks; | |
36 | struct hid_sensor_common common_attributes; | |
37 | struct hid_sensor_hub_attribute_info press_attr; | |
38 | u32 press_data; | |
a269b9a0 SP |
39 | int scale_pre_decml; |
40 | int scale_post_decml; | |
41 | int scale_precision; | |
42 | int value_offset; | |
f64a799b AP |
43 | }; |
44 | ||
45 | /* Channel definitions */ | |
46 | static const struct iio_chan_spec press_channels[] = { | |
47 | { | |
48 | .type = IIO_PRESSURE, | |
49 | .modified = 1, | |
50 | .channel2 = IIO_NO_MOD, | |
51 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), | |
52 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | | |
53 | BIT(IIO_CHAN_INFO_SCALE) | | |
54 | BIT(IIO_CHAN_INFO_SAMP_FREQ) | | |
55 | BIT(IIO_CHAN_INFO_HYSTERESIS), | |
56 | .scan_index = CHANNEL_SCAN_INDEX_PRESSURE, | |
57 | } | |
58 | }; | |
59 | ||
60 | /* Adjust channel real bits based on report descriptor */ | |
61 | static void press_adjust_channel_bit_mask(struct iio_chan_spec *channels, | |
62 | int channel, int size) | |
63 | { | |
64 | channels[channel].scan_type.sign = 's'; | |
65 | /* Real storage bits will change based on the report desc. */ | |
66 | channels[channel].scan_type.realbits = size * 8; | |
67 | /* Maximum size of a sample to capture is u32 */ | |
68 | channels[channel].scan_type.storagebits = sizeof(u32) * 8; | |
69 | } | |
70 | ||
71 | /* Channel read_raw handler */ | |
72 | static int press_read_raw(struct iio_dev *indio_dev, | |
73 | struct iio_chan_spec const *chan, | |
74 | int *val, int *val2, | |
75 | long mask) | |
76 | { | |
77 | struct press_state *press_state = iio_priv(indio_dev); | |
78 | int report_id = -1; | |
79 | u32 address; | |
80 | int ret; | |
81 | int ret_type; | |
82 | ||
83 | *val = 0; | |
84 | *val2 = 0; | |
85 | switch (mask) { | |
86 | case IIO_CHAN_INFO_RAW: | |
87 | switch (chan->scan_index) { | |
88 | case CHANNEL_SCAN_INDEX_PRESSURE: | |
89 | report_id = press_state->press_attr.report_id; | |
90 | address = | |
91 | HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE; | |
92 | break; | |
93 | default: | |
94 | report_id = -1; | |
95 | break; | |
96 | } | |
97 | if (report_id >= 0) | |
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 | else { | |
103 | *val = 0; | |
104 | return -EINVAL; | |
105 | } | |
106 | ret_type = IIO_VAL_INT; | |
107 | break; | |
108 | case IIO_CHAN_INFO_SCALE: | |
a269b9a0 SP |
109 | *val = press_state->scale_pre_decml; |
110 | *val2 = press_state->scale_post_decml; | |
111 | ret_type = press_state->scale_precision; | |
f64a799b AP |
112 | break; |
113 | case IIO_CHAN_INFO_OFFSET: | |
a269b9a0 | 114 | *val = press_state->value_offset; |
f64a799b AP |
115 | ret_type = IIO_VAL_INT; |
116 | break; | |
117 | case IIO_CHAN_INFO_SAMP_FREQ: | |
118 | ret = hid_sensor_read_samp_freq_value( | |
119 | &press_state->common_attributes, val, val2); | |
120 | ret_type = IIO_VAL_INT_PLUS_MICRO; | |
121 | break; | |
122 | case IIO_CHAN_INFO_HYSTERESIS: | |
123 | ret = hid_sensor_read_raw_hyst_value( | |
124 | &press_state->common_attributes, val, val2); | |
125 | ret_type = IIO_VAL_INT_PLUS_MICRO; | |
126 | break; | |
127 | default: | |
128 | ret_type = -EINVAL; | |
129 | break; | |
130 | } | |
131 | ||
132 | return ret_type; | |
133 | } | |
134 | ||
135 | /* Channel write_raw handler */ | |
136 | static int press_write_raw(struct iio_dev *indio_dev, | |
137 | struct iio_chan_spec const *chan, | |
138 | int val, | |
139 | int val2, | |
140 | long mask) | |
141 | { | |
142 | struct press_state *press_state = iio_priv(indio_dev); | |
143 | int ret = 0; | |
144 | ||
145 | switch (mask) { | |
146 | case IIO_CHAN_INFO_SAMP_FREQ: | |
147 | ret = hid_sensor_write_samp_freq_value( | |
148 | &press_state->common_attributes, val, val2); | |
149 | break; | |
150 | case IIO_CHAN_INFO_HYSTERESIS: | |
151 | ret = hid_sensor_write_raw_hyst_value( | |
152 | &press_state->common_attributes, val, val2); | |
153 | break; | |
154 | default: | |
155 | ret = -EINVAL; | |
156 | } | |
157 | ||
158 | return ret; | |
159 | } | |
160 | ||
161 | static const struct iio_info press_info = { | |
162 | .driver_module = THIS_MODULE, | |
163 | .read_raw = &press_read_raw, | |
164 | .write_raw = &press_write_raw, | |
165 | }; | |
166 | ||
167 | /* Function to push data to buffer */ | |
168 | static 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 | /* Callback handler to send event after all samples are received and captured */ | |
176 | static 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 [%d]\n", | |
184 | press_state->common_attributes.data_ready); | |
185 | if (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 | /* Capture samples in local storage */ | |
194 | static 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 | /* Parse report which is specific to an usage id*/ | |
216 | static 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 | ||
a269b9a0 SP |
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 | ||
f64a799b AP |
241 | /* Set Sensitivity field ids, when there is no individual modifier */ |
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 | /* Function to initialize the processing for usage id */ | |
256 | static 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 | struct iio_chan_spec *channels; | |
264 | ||
265 | indio_dev = devm_iio_device_alloc(&pdev->dev, | |
266 | sizeof(struct press_state)); | |
267 | if (!indio_dev) | |
268 | return -ENOMEM; | |
269 | platform_set_drvdata(pdev, indio_dev); | |
270 | ||
271 | press_state = iio_priv(indio_dev); | |
272 | press_state->common_attributes.hsdev = hsdev; | |
273 | press_state->common_attributes.pdev = pdev; | |
274 | ||
275 | ret = hid_sensor_parse_common_attributes(hsdev, | |
276 | HID_USAGE_SENSOR_PRESSURE, | |
277 | &press_state->common_attributes); | |
278 | if (ret) { | |
279 | dev_err(&pdev->dev, "failed to setup common attributes\n"); | |
280 | return ret; | |
281 | } | |
282 | ||
283 | channels = kmemdup(press_channels, sizeof(press_channels), GFP_KERNEL); | |
284 | if (!channels) { | |
285 | dev_err(&pdev->dev, "failed to duplicate channels\n"); | |
286 | return -ENOMEM; | |
287 | } | |
288 | ||
289 | ret = press_parse_report(pdev, hsdev, 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->channels = channels; | |
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 | press_state->common_attributes.data_ready = false; | |
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 | ||
336 | error_iio_unreg: | |
337 | iio_device_unregister(indio_dev); | |
338 | error_remove_trigger: | |
339 | hid_sensor_remove_trigger(&press_state->common_attributes); | |
340 | error_unreg_buffer_funcs: | |
341 | iio_triggered_buffer_cleanup(indio_dev); | |
342 | error_free_dev_mem: | |
343 | kfree(indio_dev->channels); | |
344 | return ret; | |
345 | } | |
346 | ||
347 | /* Function to deinitialize the processing for usage id */ | |
348 | static 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 | ||
363 | static struct platform_device_id hid_press_ids[] = { | |
364 | { | |
365 | /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ | |
366 | .name = "HID-SENSOR-200031", | |
367 | }, | |
368 | { /* sentinel */ } | |
369 | }; | |
370 | MODULE_DEVICE_TABLE(platform, hid_press_ids); | |
371 | ||
372 | static struct platform_driver hid_press_platform_driver = { | |
373 | .id_table = hid_press_ids, | |
374 | .driver = { | |
375 | .name = KBUILD_MODNAME, | |
376 | .owner = THIS_MODULE, | |
377 | }, | |
378 | .probe = hid_press_probe, | |
379 | .remove = hid_press_remove, | |
380 | }; | |
381 | module_platform_driver(hid_press_platform_driver); | |
382 | ||
383 | MODULE_DESCRIPTION("HID Sensor Pressure"); | |
384 | MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>"); | |
385 | MODULE_LICENSE("GPL"); |