]>
Commit | Line | Data |
---|---|---|
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> | |
cd5b700f | 24 | #include <linux/delay.h> |
f64a799b AP |
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 | ||
35 | struct 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; | |
a269b9a0 SP |
40 | int scale_pre_decml; |
41 | int scale_post_decml; | |
42 | int scale_precision; | |
43 | int value_offset; | |
f64a799b AP |
44 | }; |
45 | ||
46 | /* Channel definitions */ | |
47 | static const struct iio_chan_spec press_channels[] = { | |
48 | { | |
49 | .type = IIO_PRESSURE, | |
50 | .modified = 1, | |
51 | .channel2 = IIO_NO_MOD, | |
52 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), | |
53 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | | |
54 | BIT(IIO_CHAN_INFO_SCALE) | | |
55 | BIT(IIO_CHAN_INFO_SAMP_FREQ) | | |
56 | BIT(IIO_CHAN_INFO_HYSTERESIS), | |
57 | .scan_index = CHANNEL_SCAN_INDEX_PRESSURE, | |
58 | } | |
59 | }; | |
60 | ||
61 | /* Adjust channel real bits based on report descriptor */ | |
62 | static void press_adjust_channel_bit_mask(struct iio_chan_spec *channels, | |
63 | int channel, int size) | |
64 | { | |
65 | channels[channel].scan_type.sign = 's'; | |
66 | /* Real storage bits will change based on the report desc. */ | |
67 | channels[channel].scan_type.realbits = size * 8; | |
68 | /* Maximum size of a sample to capture is u32 */ | |
69 | channels[channel].scan_type.storagebits = sizeof(u32) * 8; | |
70 | } | |
71 | ||
72 | /* Channel read_raw handler */ | |
73 | static int press_read_raw(struct iio_dev *indio_dev, | |
74 | struct iio_chan_spec const *chan, | |
75 | int *val, int *val2, | |
76 | long mask) | |
77 | { | |
78 | struct press_state *press_state = iio_priv(indio_dev); | |
79 | int report_id = -1; | |
80 | u32 address; | |
f64a799b AP |
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 | } | |
cd5b700f | 97 | if (report_id >= 0) { |
cd5b700f SP |
98 | hid_sensor_power_state(&press_state->common_attributes, |
99 | true); | |
f64a799b AP |
100 | *val = sensor_hub_input_attr_get_raw_value( |
101 | press_state->common_attributes.hsdev, | |
102 | HID_USAGE_SENSOR_PRESSURE, address, | |
b3f4737d SP |
103 | report_id, |
104 | SENSOR_HUB_SYNC); | |
cd5b700f SP |
105 | hid_sensor_power_state(&press_state->common_attributes, |
106 | false); | |
107 | } else { | |
f64a799b AP |
108 | *val = 0; |
109 | return -EINVAL; | |
110 | } | |
111 | ret_type = IIO_VAL_INT; | |
112 | break; | |
113 | case IIO_CHAN_INFO_SCALE: | |
a269b9a0 SP |
114 | *val = press_state->scale_pre_decml; |
115 | *val2 = press_state->scale_post_decml; | |
116 | ret_type = press_state->scale_precision; | |
f64a799b AP |
117 | break; |
118 | case IIO_CHAN_INFO_OFFSET: | |
a269b9a0 | 119 | *val = press_state->value_offset; |
f64a799b AP |
120 | ret_type = IIO_VAL_INT; |
121 | break; | |
122 | case IIO_CHAN_INFO_SAMP_FREQ: | |
6c3d8d4f | 123 | ret_type = hid_sensor_read_samp_freq_value( |
f64a799b | 124 | &press_state->common_attributes, val, val2); |
f64a799b AP |
125 | break; |
126 | case IIO_CHAN_INFO_HYSTERESIS: | |
6c3d8d4f | 127 | ret_type = hid_sensor_read_raw_hyst_value( |
f64a799b | 128 | &press_state->common_attributes, val, val2); |
f64a799b AP |
129 | break; |
130 | default: | |
131 | ret_type = -EINVAL; | |
132 | break; | |
133 | } | |
134 | ||
135 | return ret_type; | |
136 | } | |
137 | ||
138 | /* Channel write_raw handler */ | |
139 | static int press_write_raw(struct iio_dev *indio_dev, | |
140 | struct iio_chan_spec const *chan, | |
141 | int val, | |
142 | int val2, | |
143 | long mask) | |
144 | { | |
145 | struct press_state *press_state = iio_priv(indio_dev); | |
146 | int ret = 0; | |
147 | ||
148 | switch (mask) { | |
149 | case IIO_CHAN_INFO_SAMP_FREQ: | |
150 | ret = hid_sensor_write_samp_freq_value( | |
151 | &press_state->common_attributes, val, val2); | |
152 | break; | |
153 | case IIO_CHAN_INFO_HYSTERESIS: | |
154 | ret = hid_sensor_write_raw_hyst_value( | |
155 | &press_state->common_attributes, val, val2); | |
156 | break; | |
157 | default: | |
158 | ret = -EINVAL; | |
159 | } | |
160 | ||
161 | return ret; | |
162 | } | |
163 | ||
164 | static const struct iio_info press_info = { | |
165 | .driver_module = THIS_MODULE, | |
166 | .read_raw = &press_read_raw, | |
167 | .write_raw = &press_write_raw, | |
168 | }; | |
169 | ||
170 | /* Function to push data to buffer */ | |
171 | static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data, | |
172 | int len) | |
173 | { | |
174 | dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); | |
175 | iio_push_to_buffers(indio_dev, data); | |
176 | } | |
177 | ||
178 | /* Callback handler to send event after all samples are received and captured */ | |
179 | static int press_proc_event(struct hid_sensor_hub_device *hsdev, | |
180 | unsigned usage_id, | |
181 | void *priv) | |
182 | { | |
183 | struct iio_dev *indio_dev = platform_get_drvdata(priv); | |
184 | struct press_state *press_state = iio_priv(indio_dev); | |
185 | ||
56ff6be6 SP |
186 | dev_dbg(&indio_dev->dev, "press_proc_event\n"); |
187 | if (atomic_read(&press_state->common_attributes.data_ready)) | |
f64a799b AP |
188 | hid_sensor_push_data(indio_dev, |
189 | &press_state->press_data, | |
190 | sizeof(press_state->press_data)); | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
195 | /* Capture samples in local storage */ | |
196 | static int press_capture_sample(struct hid_sensor_hub_device *hsdev, | |
197 | unsigned usage_id, | |
198 | size_t raw_len, char *raw_data, | |
199 | void *priv) | |
200 | { | |
201 | struct iio_dev *indio_dev = platform_get_drvdata(priv); | |
202 | struct press_state *press_state = iio_priv(indio_dev); | |
203 | int ret = -EINVAL; | |
204 | ||
205 | switch (usage_id) { | |
206 | case HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE: | |
207 | press_state->press_data = *(u32 *)raw_data; | |
208 | ret = 0; | |
209 | break; | |
210 | default: | |
211 | break; | |
212 | } | |
213 | ||
214 | return ret; | |
215 | } | |
216 | ||
217 | /* Parse report which is specific to an usage id*/ | |
218 | static int press_parse_report(struct platform_device *pdev, | |
219 | struct hid_sensor_hub_device *hsdev, | |
220 | struct iio_chan_spec *channels, | |
221 | unsigned usage_id, | |
222 | struct press_state *st) | |
223 | { | |
224 | int ret; | |
225 | ||
226 | ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT, | |
227 | usage_id, | |
228 | HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE, | |
229 | &st->press_attr); | |
230 | if (ret < 0) | |
231 | return ret; | |
232 | press_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESSURE, | |
233 | st->press_attr.size); | |
234 | ||
235 | dev_dbg(&pdev->dev, "press %x:%x\n", st->press_attr.index, | |
236 | st->press_attr.report_id); | |
237 | ||
a269b9a0 SP |
238 | st->scale_precision = hid_sensor_format_scale( |
239 | HID_USAGE_SENSOR_PRESSURE, | |
240 | &st->press_attr, | |
241 | &st->scale_pre_decml, &st->scale_post_decml); | |
242 | ||
f64a799b AP |
243 | /* Set Sensitivity field ids, when there is no individual modifier */ |
244 | if (st->common_attributes.sensitivity.index < 0) { | |
245 | sensor_hub_input_get_attribute_info(hsdev, | |
246 | HID_FEATURE_REPORT, usage_id, | |
247 | HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS | | |
248 | HID_USAGE_SENSOR_DATA_ATMOSPHERIC_PRESSURE, | |
249 | &st->common_attributes.sensitivity); | |
250 | dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n", | |
251 | st->common_attributes.sensitivity.index, | |
252 | st->common_attributes.sensitivity.report_id); | |
253 | } | |
254 | return ret; | |
255 | } | |
256 | ||
257 | /* Function to initialize the processing for usage id */ | |
258 | static int hid_press_probe(struct platform_device *pdev) | |
259 | { | |
260 | int ret = 0; | |
261 | static const char *name = "press"; | |
262 | struct iio_dev *indio_dev; | |
263 | struct press_state *press_state; | |
264 | struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; | |
265 | struct iio_chan_spec *channels; | |
266 | ||
267 | indio_dev = devm_iio_device_alloc(&pdev->dev, | |
268 | sizeof(struct press_state)); | |
269 | if (!indio_dev) | |
270 | return -ENOMEM; | |
271 | platform_set_drvdata(pdev, indio_dev); | |
272 | ||
273 | press_state = iio_priv(indio_dev); | |
274 | press_state->common_attributes.hsdev = hsdev; | |
275 | press_state->common_attributes.pdev = pdev; | |
276 | ||
277 | ret = hid_sensor_parse_common_attributes(hsdev, | |
278 | HID_USAGE_SENSOR_PRESSURE, | |
279 | &press_state->common_attributes); | |
280 | if (ret) { | |
281 | dev_err(&pdev->dev, "failed to setup common attributes\n"); | |
282 | return ret; | |
283 | } | |
284 | ||
285 | channels = kmemdup(press_channels, sizeof(press_channels), GFP_KERNEL); | |
286 | if (!channels) { | |
287 | dev_err(&pdev->dev, "failed to duplicate channels\n"); | |
288 | return -ENOMEM; | |
289 | } | |
290 | ||
291 | ret = press_parse_report(pdev, hsdev, channels, | |
292 | HID_USAGE_SENSOR_PRESSURE, press_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->channels = channels; | |
299 | indio_dev->num_channels = | |
300 | ARRAY_SIZE(press_channels); | |
301 | indio_dev->dev.parent = &pdev->dev; | |
302 | indio_dev->info = &press_info; | |
303 | indio_dev->name = name; | |
304 | indio_dev->modes = INDIO_DIRECT_MODE; | |
305 | ||
306 | ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, | |
307 | NULL, NULL); | |
308 | if (ret) { | |
309 | dev_err(&pdev->dev, "failed to initialize trigger buffer\n"); | |
310 | goto error_free_dev_mem; | |
311 | } | |
56ff6be6 | 312 | atomic_set(&press_state->common_attributes.data_ready, 0); |
f64a799b AP |
313 | ret = hid_sensor_setup_trigger(indio_dev, name, |
314 | &press_state->common_attributes); | |
315 | if (ret) { | |
316 | dev_err(&pdev->dev, "trigger setup failed\n"); | |
317 | goto error_unreg_buffer_funcs; | |
318 | } | |
319 | ||
320 | ret = iio_device_register(indio_dev); | |
321 | if (ret) { | |
322 | dev_err(&pdev->dev, "device register failed\n"); | |
323 | goto error_remove_trigger; | |
324 | } | |
325 | ||
326 | press_state->callbacks.send_event = press_proc_event; | |
327 | press_state->callbacks.capture_sample = press_capture_sample; | |
328 | press_state->callbacks.pdev = pdev; | |
329 | ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PRESSURE, | |
330 | &press_state->callbacks); | |
331 | if (ret < 0) { | |
332 | dev_err(&pdev->dev, "callback reg failed\n"); | |
333 | goto error_iio_unreg; | |
334 | } | |
335 | ||
336 | return ret; | |
337 | ||
338 | error_iio_unreg: | |
339 | iio_device_unregister(indio_dev); | |
340 | error_remove_trigger: | |
341 | hid_sensor_remove_trigger(&press_state->common_attributes); | |
342 | error_unreg_buffer_funcs: | |
343 | iio_triggered_buffer_cleanup(indio_dev); | |
344 | error_free_dev_mem: | |
345 | kfree(indio_dev->channels); | |
346 | return ret; | |
347 | } | |
348 | ||
349 | /* Function to deinitialize the processing for usage id */ | |
350 | static int hid_press_remove(struct platform_device *pdev) | |
351 | { | |
352 | struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; | |
353 | struct iio_dev *indio_dev = platform_get_drvdata(pdev); | |
354 | struct press_state *press_state = iio_priv(indio_dev); | |
355 | ||
356 | sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PRESSURE); | |
357 | iio_device_unregister(indio_dev); | |
358 | hid_sensor_remove_trigger(&press_state->common_attributes); | |
359 | iio_triggered_buffer_cleanup(indio_dev); | |
360 | kfree(indio_dev->channels); | |
361 | ||
362 | return 0; | |
363 | } | |
364 | ||
365 | static struct platform_device_id hid_press_ids[] = { | |
366 | { | |
367 | /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ | |
368 | .name = "HID-SENSOR-200031", | |
369 | }, | |
370 | { /* sentinel */ } | |
371 | }; | |
372 | MODULE_DEVICE_TABLE(platform, hid_press_ids); | |
373 | ||
374 | static struct platform_driver hid_press_platform_driver = { | |
375 | .id_table = hid_press_ids, | |
376 | .driver = { | |
377 | .name = KBUILD_MODNAME, | |
a77945fd | 378 | .pm = &hid_sensor_pm_ops, |
f64a799b AP |
379 | }, |
380 | .probe = hid_press_probe, | |
381 | .remove = hid_press_remove, | |
382 | }; | |
383 | module_platform_driver(hid_press_platform_driver); | |
384 | ||
385 | MODULE_DESCRIPTION("HID Sensor Pressure"); | |
386 | MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>"); | |
387 | MODULE_LICENSE("GPL"); |