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fc18dddc SP |
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 | ||
15 | #include <linux/device.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/interrupt.h> | |
19 | #include <linux/irq.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/hid-sensor-hub.h> | |
22 | #include <linux/iio/iio.h> | |
23 | #include <linux/iio/sysfs.h> | |
24 | #include <linux/iio/buffer.h> | |
25 | #include <linux/iio/trigger_consumer.h> | |
26 | #include <linux/iio/triggered_buffer.h> | |
27 | #include "../common/hid-sensors/hid-sensor-trigger.h" | |
28 | ||
29 | struct dev_rot_state { | |
30 | struct hid_sensor_hub_callbacks callbacks; | |
31 | struct hid_sensor_common common_attributes; | |
32 | struct hid_sensor_hub_attribute_info quaternion; | |
33 | u32 sampled_vals[4]; | |
34 | }; | |
35 | ||
36 | /* Channel definitions */ | |
37 | static const struct iio_chan_spec dev_rot_channels[] = { | |
38 | { | |
39 | .type = IIO_ROT, | |
40 | .modified = 1, | |
41 | .channel2 = IIO_MOD_QUATERNION, | |
42 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), | |
43 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | | |
44 | BIT(IIO_CHAN_INFO_HYSTERESIS) | |
45 | } | |
46 | }; | |
47 | ||
48 | /* Adjust channel real bits based on report descriptor */ | |
49 | static void dev_rot_adjust_channel_bit_mask(struct iio_chan_spec *chan, | |
50 | int size) | |
51 | { | |
52 | chan->scan_type.sign = 's'; | |
53 | /* Real storage bits will change based on the report desc. */ | |
54 | chan->scan_type.realbits = size * 8; | |
55 | /* Maximum size of a sample to capture is u32 */ | |
56 | chan->scan_type.storagebits = sizeof(u32) * 8; | |
57 | chan->scan_type.repeat = 4; | |
58 | } | |
59 | ||
60 | /* Channel read_raw handler */ | |
61 | static int dev_rot_read_raw(struct iio_dev *indio_dev, | |
62 | struct iio_chan_spec const *chan, | |
63 | int size, int *vals, int *val_len, | |
64 | long mask) | |
65 | { | |
66 | struct dev_rot_state *rot_state = iio_priv(indio_dev); | |
67 | int ret_type; | |
68 | int i; | |
69 | ||
70 | vals[0] = 0; | |
71 | vals[1] = 0; | |
72 | ||
73 | switch (mask) { | |
74 | case IIO_CHAN_INFO_RAW: | |
75 | if (size >= 4) { | |
76 | for (i = 0; i < 4; ++i) | |
77 | vals[i] = rot_state->sampled_vals[i]; | |
78 | ret_type = IIO_VAL_INT_MULTIPLE; | |
79 | *val_len = 4; | |
80 | } else | |
81 | ret_type = -EINVAL; | |
82 | break; | |
83 | case IIO_CHAN_INFO_SAMP_FREQ: | |
84 | ret_type = hid_sensor_read_samp_freq_value( | |
85 | &rot_state->common_attributes, &vals[0], &vals[1]); | |
86 | break; | |
87 | case IIO_CHAN_INFO_HYSTERESIS: | |
88 | ret_type = hid_sensor_read_raw_hyst_value( | |
89 | &rot_state->common_attributes, &vals[0], &vals[1]); | |
90 | break; | |
91 | default: | |
92 | ret_type = -EINVAL; | |
93 | break; | |
94 | } | |
95 | ||
96 | return ret_type; | |
97 | } | |
98 | ||
99 | /* Channel write_raw handler */ | |
100 | static int dev_rot_write_raw(struct iio_dev *indio_dev, | |
101 | struct iio_chan_spec const *chan, | |
102 | int val, | |
103 | int val2, | |
104 | long mask) | |
105 | { | |
106 | struct dev_rot_state *rot_state = iio_priv(indio_dev); | |
107 | int ret; | |
108 | ||
109 | switch (mask) { | |
110 | case IIO_CHAN_INFO_SAMP_FREQ: | |
111 | ret = hid_sensor_write_samp_freq_value( | |
112 | &rot_state->common_attributes, val, val2); | |
113 | break; | |
114 | case IIO_CHAN_INFO_HYSTERESIS: | |
115 | ret = hid_sensor_write_raw_hyst_value( | |
116 | &rot_state->common_attributes, val, val2); | |
117 | break; | |
118 | default: | |
119 | ret = -EINVAL; | |
120 | } | |
121 | ||
122 | return ret; | |
123 | } | |
124 | ||
125 | static const struct iio_info dev_rot_info = { | |
126 | .driver_module = THIS_MODULE, | |
127 | .read_raw_multi = &dev_rot_read_raw, | |
128 | .write_raw = &dev_rot_write_raw, | |
129 | }; | |
130 | ||
131 | /* Function to push data to buffer */ | |
132 | static void hid_sensor_push_data(struct iio_dev *indio_dev, u8 *data, int len) | |
133 | { | |
134 | dev_dbg(&indio_dev->dev, "hid_sensor_push_data >>\n"); | |
135 | iio_push_to_buffers(indio_dev, (u8 *)data); | |
136 | dev_dbg(&indio_dev->dev, "hid_sensor_push_data <<\n"); | |
137 | ||
138 | } | |
139 | ||
140 | /* Callback handler to send event after all samples are received and captured */ | |
141 | static int dev_rot_proc_event(struct hid_sensor_hub_device *hsdev, | |
142 | unsigned usage_id, | |
143 | void *priv) | |
144 | { | |
145 | struct iio_dev *indio_dev = platform_get_drvdata(priv); | |
146 | struct dev_rot_state *rot_state = iio_priv(indio_dev); | |
147 | ||
56ff6be6 SP |
148 | dev_dbg(&indio_dev->dev, "dev_rot_proc_event\n"); |
149 | if (atomic_read(&rot_state->common_attributes.data_ready)) | |
fc18dddc SP |
150 | hid_sensor_push_data(indio_dev, |
151 | (u8 *)rot_state->sampled_vals, | |
152 | sizeof(rot_state->sampled_vals)); | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
157 | /* Capture samples in local storage */ | |
158 | static int dev_rot_capture_sample(struct hid_sensor_hub_device *hsdev, | |
159 | unsigned usage_id, | |
160 | size_t raw_len, char *raw_data, | |
161 | void *priv) | |
162 | { | |
163 | struct iio_dev *indio_dev = platform_get_drvdata(priv); | |
164 | struct dev_rot_state *rot_state = iio_priv(indio_dev); | |
165 | ||
166 | if (usage_id == HID_USAGE_SENSOR_ORIENT_QUATERNION) { | |
167 | memcpy(rot_state->sampled_vals, raw_data, | |
168 | sizeof(rot_state->sampled_vals)); | |
169 | dev_dbg(&indio_dev->dev, "Recd Quat len:%zu::%zu\n", raw_len, | |
170 | sizeof(rot_state->sampled_vals)); | |
171 | } | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
176 | /* Parse report which is specific to an usage id*/ | |
177 | static int dev_rot_parse_report(struct platform_device *pdev, | |
178 | struct hid_sensor_hub_device *hsdev, | |
179 | struct iio_chan_spec *channels, | |
180 | unsigned usage_id, | |
181 | struct dev_rot_state *st) | |
182 | { | |
183 | int ret; | |
184 | ||
185 | ret = sensor_hub_input_get_attribute_info(hsdev, | |
186 | HID_INPUT_REPORT, | |
187 | usage_id, | |
188 | HID_USAGE_SENSOR_ORIENT_QUATERNION, | |
189 | &st->quaternion); | |
190 | if (ret) | |
191 | return ret; | |
192 | ||
193 | dev_rot_adjust_channel_bit_mask(&channels[0], | |
194 | st->quaternion.size / 4); | |
195 | ||
196 | dev_dbg(&pdev->dev, "dev_rot %x:%x\n", st->quaternion.index, | |
197 | st->quaternion.report_id); | |
198 | ||
199 | dev_dbg(&pdev->dev, "dev_rot: attrib size %d\n", | |
200 | st->quaternion.size); | |
201 | ||
202 | /* Set Sensitivity field ids, when there is no individual modifier */ | |
203 | if (st->common_attributes.sensitivity.index < 0) { | |
204 | sensor_hub_input_get_attribute_info(hsdev, | |
205 | HID_FEATURE_REPORT, usage_id, | |
206 | HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS | | |
207 | HID_USAGE_SENSOR_DATA_ORIENTATION, | |
208 | &st->common_attributes.sensitivity); | |
209 | dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n", | |
210 | st->common_attributes.sensitivity.index, | |
211 | st->common_attributes.sensitivity.report_id); | |
212 | } | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | /* Function to initialize the processing for usage id */ | |
218 | static int hid_dev_rot_probe(struct platform_device *pdev) | |
219 | { | |
220 | int ret; | |
221 | static char *name = "dev_rotation"; | |
222 | struct iio_dev *indio_dev; | |
223 | struct dev_rot_state *rot_state; | |
224 | struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; | |
fc18dddc SP |
225 | |
226 | indio_dev = devm_iio_device_alloc(&pdev->dev, | |
227 | sizeof(struct dev_rot_state)); | |
228 | if (indio_dev == NULL) | |
229 | return -ENOMEM; | |
230 | ||
231 | platform_set_drvdata(pdev, indio_dev); | |
232 | ||
233 | rot_state = iio_priv(indio_dev); | |
234 | rot_state->common_attributes.hsdev = hsdev; | |
235 | rot_state->common_attributes.pdev = pdev; | |
236 | ||
237 | ret = hid_sensor_parse_common_attributes(hsdev, | |
238 | HID_USAGE_SENSOR_DEVICE_ORIENTATION, | |
239 | &rot_state->common_attributes); | |
240 | if (ret) { | |
241 | dev_err(&pdev->dev, "failed to setup common attributes\n"); | |
242 | return ret; | |
243 | } | |
244 | ||
2bd04628 FE |
245 | indio_dev->channels = devm_kmemdup(&pdev->dev, dev_rot_channels, |
246 | sizeof(dev_rot_channels), | |
247 | GFP_KERNEL); | |
248 | if (!indio_dev->channels) { | |
fc18dddc SP |
249 | dev_err(&pdev->dev, "failed to duplicate channels\n"); |
250 | return -ENOMEM; | |
251 | } | |
252 | ||
2bd04628 FE |
253 | ret = dev_rot_parse_report(pdev, hsdev, |
254 | (struct iio_chan_spec *)indio_dev->channels, | |
255 | HID_USAGE_SENSOR_DEVICE_ORIENTATION, | |
256 | rot_state); | |
fc18dddc SP |
257 | if (ret) { |
258 | dev_err(&pdev->dev, "failed to setup attributes\n"); | |
259 | return ret; | |
260 | } | |
261 | ||
fc18dddc SP |
262 | indio_dev->num_channels = ARRAY_SIZE(dev_rot_channels); |
263 | indio_dev->dev.parent = &pdev->dev; | |
264 | indio_dev->info = &dev_rot_info; | |
265 | indio_dev->name = name; | |
266 | indio_dev->modes = INDIO_DIRECT_MODE; | |
267 | ||
268 | ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, | |
269 | NULL, NULL); | |
270 | if (ret) { | |
271 | dev_err(&pdev->dev, "failed to initialize trigger buffer\n"); | |
272 | return ret; | |
273 | } | |
56ff6be6 | 274 | atomic_set(&rot_state->common_attributes.data_ready, 0); |
fc18dddc SP |
275 | ret = hid_sensor_setup_trigger(indio_dev, name, |
276 | &rot_state->common_attributes); | |
277 | if (ret) { | |
278 | dev_err(&pdev->dev, "trigger setup failed\n"); | |
279 | goto error_unreg_buffer_funcs; | |
280 | } | |
281 | ||
282 | ret = iio_device_register(indio_dev); | |
283 | if (ret) { | |
284 | dev_err(&pdev->dev, "device register failed\n"); | |
285 | goto error_remove_trigger; | |
286 | } | |
287 | ||
288 | rot_state->callbacks.send_event = dev_rot_proc_event; | |
289 | rot_state->callbacks.capture_sample = dev_rot_capture_sample; | |
290 | rot_state->callbacks.pdev = pdev; | |
291 | ret = sensor_hub_register_callback(hsdev, | |
292 | HID_USAGE_SENSOR_DEVICE_ORIENTATION, | |
293 | &rot_state->callbacks); | |
294 | if (ret) { | |
295 | dev_err(&pdev->dev, "callback reg failed\n"); | |
296 | goto error_iio_unreg; | |
297 | } | |
298 | ||
299 | return 0; | |
300 | ||
301 | error_iio_unreg: | |
302 | iio_device_unregister(indio_dev); | |
303 | error_remove_trigger: | |
304 | hid_sensor_remove_trigger(&rot_state->common_attributes); | |
305 | error_unreg_buffer_funcs: | |
306 | iio_triggered_buffer_cleanup(indio_dev); | |
307 | return ret; | |
308 | } | |
309 | ||
310 | /* Function to deinitialize the processing for usage id */ | |
311 | static int hid_dev_rot_remove(struct platform_device *pdev) | |
312 | { | |
313 | struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; | |
314 | struct iio_dev *indio_dev = platform_get_drvdata(pdev); | |
315 | struct dev_rot_state *rot_state = iio_priv(indio_dev); | |
316 | ||
317 | sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_DEVICE_ORIENTATION); | |
318 | iio_device_unregister(indio_dev); | |
319 | hid_sensor_remove_trigger(&rot_state->common_attributes); | |
320 | iio_triggered_buffer_cleanup(indio_dev); | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
6b490c6c | 325 | static const struct platform_device_id hid_dev_rot_ids[] = { |
fc18dddc SP |
326 | { |
327 | /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ | |
328 | .name = "HID-SENSOR-20008a", | |
329 | }, | |
330 | { /* sentinel */ } | |
331 | }; | |
332 | MODULE_DEVICE_TABLE(platform, hid_dev_rot_ids); | |
333 | ||
334 | static struct platform_driver hid_dev_rot_platform_driver = { | |
335 | .id_table = hid_dev_rot_ids, | |
336 | .driver = { | |
337 | .name = KBUILD_MODNAME, | |
8af644a7 | 338 | .pm = &hid_sensor_pm_ops, |
fc18dddc SP |
339 | }, |
340 | .probe = hid_dev_rot_probe, | |
341 | .remove = hid_dev_rot_remove, | |
342 | }; | |
343 | module_platform_driver(hid_dev_rot_platform_driver); | |
344 | ||
345 | MODULE_DESCRIPTION("HID Sensor Device Rotation"); | |
346 | MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); | |
347 | MODULE_LICENSE("GPL"); |