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ed5514c9 | 1 | /* |
2 | * HID Sensors Driver | |
3 | * Copyright (c) 2012, 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; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | * | |
18 | */ | |
19 | #include <linux/device.h> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/irq.h> | |
24 | #include <linux/slab.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-attributes.h" | |
32 | #include "../common/hid-sensors/hid-sensor-trigger.h" | |
33 | ||
34 | /*Format: HID-SENSOR-usage_id_in_hex*/ | |
35 | /*Usage ID from spec for Accelerometer-3D: 0x200041*/ | |
36 | #define DRIVER_NAME "HID-SENSOR-200041" | |
37 | ||
38 | #define CHANNEL_SCAN_INDEX_ILLUM 0 | |
39 | ||
40 | struct als_state { | |
41 | struct hid_sensor_hub_callbacks callbacks; | |
42 | struct hid_sensor_iio_common common_attributes; | |
43 | struct hid_sensor_hub_attribute_info als_illum; | |
44 | u32 illum; | |
45 | }; | |
46 | ||
47 | /* Channel definitions */ | |
48 | static const struct iio_chan_spec als_channels[] = { | |
49 | { | |
50 | .type = IIO_INTENSITY, | |
51 | .modified = 1, | |
52 | .channel2 = IIO_MOD_LIGHT_BOTH, | |
53 | .info_mask = IIO_CHAN_INFO_OFFSET_SHARED_BIT | | |
54 | IIO_CHAN_INFO_SCALE_SHARED_BIT | | |
55 | IIO_CHAN_INFO_SAMP_FREQ_SHARED_BIT | | |
56 | IIO_CHAN_INFO_HYSTERESIS_SHARED_BIT, | |
57 | .scan_index = CHANNEL_SCAN_INDEX_ILLUM, | |
58 | } | |
59 | }; | |
60 | ||
61 | /* Adjust channel real bits based on report descriptor */ | |
62 | static void als_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 als_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 als_state *als_state = iio_priv(indio_dev); | |
79 | int report_id = -1; | |
80 | u32 address; | |
81 | int ret; | |
82 | int ret_type; | |
83 | ||
84 | *val = 0; | |
85 | *val2 = 0; | |
86 | switch (mask) { | |
87 | case 0: | |
88 | switch (chan->scan_index) { | |
89 | case CHANNEL_SCAN_INDEX_ILLUM: | |
90 | report_id = als_state->als_illum.report_id; | |
91 | address = | |
92 | HID_USAGE_SENSOR_LIGHT_ILLUM; | |
93 | break; | |
94 | default: | |
95 | report_id = -1; | |
96 | break; | |
97 | } | |
98 | if (report_id >= 0) | |
99 | *val = sensor_hub_input_attr_get_raw_value( | |
100 | als_state->common_attributes.hsdev, | |
101 | HID_USAGE_SENSOR_ALS, address, | |
102 | report_id); | |
103 | else { | |
104 | *val = 0; | |
105 | return -EINVAL; | |
106 | } | |
107 | ret_type = IIO_VAL_INT; | |
108 | break; | |
109 | case IIO_CHAN_INFO_SCALE: | |
110 | *val = als_state->als_illum.units; | |
111 | ret_type = IIO_VAL_INT; | |
112 | break; | |
113 | case IIO_CHAN_INFO_OFFSET: | |
114 | *val = hid_sensor_convert_exponent( | |
115 | als_state->als_illum.unit_expo); | |
116 | ret_type = IIO_VAL_INT; | |
117 | break; | |
118 | case IIO_CHAN_INFO_SAMP_FREQ: | |
119 | ret = hid_sensor_read_samp_freq_value( | |
120 | &als_state->common_attributes, val, val2); | |
121 | ret_type = IIO_VAL_INT_PLUS_MICRO; | |
122 | break; | |
123 | case IIO_CHAN_INFO_HYSTERESIS: | |
124 | ret = hid_sensor_read_raw_hyst_value( | |
125 | &als_state->common_attributes, val, val2); | |
126 | ret_type = IIO_VAL_INT_PLUS_MICRO; | |
127 | break; | |
128 | default: | |
129 | ret_type = -EINVAL; | |
130 | break; | |
131 | } | |
132 | ||
133 | return ret_type; | |
134 | } | |
135 | ||
136 | /* Channel write_raw handler */ | |
137 | static int als_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 als_state *als_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 | &als_state->common_attributes, val, val2); | |
150 | break; | |
151 | case IIO_CHAN_INFO_HYSTERESIS: | |
152 | ret = hid_sensor_write_raw_hyst_value( | |
153 | &als_state->common_attributes, val, val2); | |
154 | break; | |
155 | default: | |
156 | ret = -EINVAL; | |
157 | } | |
158 | ||
159 | return ret; | |
160 | } | |
161 | ||
162 | static int als_write_raw_get_fmt(struct iio_dev *indio_dev, | |
163 | struct iio_chan_spec const *chan, | |
164 | long mask) | |
165 | { | |
166 | return IIO_VAL_INT_PLUS_MICRO; | |
167 | } | |
168 | ||
169 | static const struct iio_info als_info = { | |
170 | .driver_module = THIS_MODULE, | |
171 | .read_raw = &als_read_raw, | |
172 | .write_raw = &als_write_raw, | |
173 | .write_raw_get_fmt = &als_write_raw_get_fmt, | |
174 | }; | |
175 | ||
176 | /* Function to push data to buffer */ | |
177 | static void hid_sensor_push_data(struct iio_dev *indio_dev, u8 *data, int len) | |
178 | { | |
ed5514c9 | 179 | dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); |
84b36ce5 | 180 | iio_push_to_buffers(indio_dev, (u8 *)data); |
ed5514c9 | 181 | } |
182 | ||
183 | /* Callback handler to send event after all samples are received and captured */ | |
184 | static int als_proc_event(struct hid_sensor_hub_device *hsdev, | |
185 | unsigned usage_id, | |
186 | void *priv) | |
187 | { | |
188 | struct iio_dev *indio_dev = platform_get_drvdata(priv); | |
189 | struct als_state *als_state = iio_priv(indio_dev); | |
190 | ||
191 | dev_dbg(&indio_dev->dev, "als_proc_event [%d]\n", | |
192 | als_state->common_attributes.data_ready); | |
193 | if (als_state->common_attributes.data_ready) | |
194 | hid_sensor_push_data(indio_dev, | |
195 | (u8 *)&als_state->illum, | |
196 | sizeof(als_state->illum)); | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
201 | /* Capture samples in local storage */ | |
202 | static int als_capture_sample(struct hid_sensor_hub_device *hsdev, | |
203 | unsigned usage_id, | |
204 | size_t raw_len, char *raw_data, | |
205 | void *priv) | |
206 | { | |
207 | struct iio_dev *indio_dev = platform_get_drvdata(priv); | |
208 | struct als_state *als_state = iio_priv(indio_dev); | |
209 | int ret = -EINVAL; | |
210 | ||
211 | switch (usage_id) { | |
212 | case HID_USAGE_SENSOR_LIGHT_ILLUM: | |
213 | als_state->illum = *(u32 *)raw_data; | |
214 | ret = 0; | |
215 | break; | |
216 | default: | |
217 | break; | |
218 | } | |
219 | ||
220 | return ret; | |
221 | } | |
222 | ||
223 | /* Parse report which is specific to an usage id*/ | |
224 | static int als_parse_report(struct platform_device *pdev, | |
225 | struct hid_sensor_hub_device *hsdev, | |
226 | struct iio_chan_spec *channels, | |
227 | unsigned usage_id, | |
228 | struct als_state *st) | |
229 | { | |
230 | int ret; | |
231 | ||
232 | ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT, | |
233 | usage_id, | |
234 | HID_USAGE_SENSOR_LIGHT_ILLUM, | |
235 | &st->als_illum); | |
236 | if (ret < 0) | |
237 | return ret; | |
238 | als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_ILLUM, | |
239 | st->als_illum.size); | |
240 | ||
241 | dev_dbg(&pdev->dev, "als %x:%x\n", st->als_illum.index, | |
242 | st->als_illum.report_id); | |
243 | ||
244 | return ret; | |
245 | } | |
246 | ||
247 | /* Function to initialize the processing for usage id */ | |
248 | static int __devinit hid_als_probe(struct platform_device *pdev) | |
249 | { | |
250 | int ret = 0; | |
251 | static const char *name = "als"; | |
252 | struct iio_dev *indio_dev; | |
253 | struct als_state *als_state; | |
254 | struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; | |
255 | struct iio_chan_spec *channels; | |
256 | ||
257 | indio_dev = iio_device_alloc(sizeof(struct als_state)); | |
258 | if (indio_dev == NULL) { | |
259 | ret = -ENOMEM; | |
260 | goto error_ret; | |
261 | } | |
262 | platform_set_drvdata(pdev, indio_dev); | |
263 | ||
264 | als_state = iio_priv(indio_dev); | |
265 | als_state->common_attributes.hsdev = hsdev; | |
266 | als_state->common_attributes.pdev = pdev; | |
267 | ||
268 | ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_ALS, | |
269 | &als_state->common_attributes); | |
270 | if (ret) { | |
271 | dev_err(&pdev->dev, "failed to setup common attributes\n"); | |
272 | goto error_free_dev; | |
273 | } | |
274 | ||
64ebe955 | 275 | channels = kmemdup(als_channels, sizeof(als_channels), GFP_KERNEL); |
ed5514c9 | 276 | if (!channels) { |
64ebe955 | 277 | ret = -ENOMEM; |
ed5514c9 | 278 | dev_err(&pdev->dev, "failed to duplicate channels\n"); |
279 | goto error_free_dev; | |
280 | } | |
281 | ||
282 | ret = als_parse_report(pdev, hsdev, channels, | |
283 | HID_USAGE_SENSOR_ALS, als_state); | |
284 | if (ret) { | |
285 | dev_err(&pdev->dev, "failed to setup attributes\n"); | |
286 | goto error_free_dev_mem; | |
287 | } | |
288 | ||
289 | indio_dev->channels = channels; | |
290 | indio_dev->num_channels = | |
291 | ARRAY_SIZE(als_channels); | |
292 | indio_dev->dev.parent = &pdev->dev; | |
293 | indio_dev->info = &als_info; | |
294 | indio_dev->name = name; | |
295 | indio_dev->modes = INDIO_DIRECT_MODE; | |
296 | ||
297 | ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, | |
298 | NULL, NULL); | |
299 | if (ret) { | |
300 | dev_err(&pdev->dev, "failed to initialize trigger buffer\n"); | |
301 | goto error_free_dev_mem; | |
302 | } | |
303 | als_state->common_attributes.data_ready = false; | |
304 | ret = hid_sensor_setup_trigger(indio_dev, name, | |
305 | &als_state->common_attributes); | |
306 | if (ret < 0) { | |
307 | dev_err(&pdev->dev, "trigger setup failed\n"); | |
308 | goto error_unreg_buffer_funcs; | |
309 | } | |
310 | ||
311 | ret = iio_device_register(indio_dev); | |
312 | if (ret) { | |
313 | dev_err(&pdev->dev, "device register failed\n"); | |
314 | goto error_remove_trigger; | |
315 | } | |
316 | ||
317 | als_state->callbacks.send_event = als_proc_event; | |
318 | als_state->callbacks.capture_sample = als_capture_sample; | |
319 | als_state->callbacks.pdev = pdev; | |
320 | ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ALS, | |
321 | &als_state->callbacks); | |
322 | if (ret < 0) { | |
323 | dev_err(&pdev->dev, "callback reg failed\n"); | |
324 | goto error_iio_unreg; | |
325 | } | |
326 | ||
327 | return ret; | |
328 | ||
329 | error_iio_unreg: | |
330 | iio_device_unregister(indio_dev); | |
331 | error_remove_trigger: | |
332 | hid_sensor_remove_trigger(indio_dev); | |
333 | error_unreg_buffer_funcs: | |
334 | iio_triggered_buffer_cleanup(indio_dev); | |
335 | error_free_dev_mem: | |
336 | kfree(indio_dev->channels); | |
337 | error_free_dev: | |
338 | iio_device_free(indio_dev); | |
339 | error_ret: | |
340 | return ret; | |
341 | } | |
342 | ||
343 | /* Function to deinitialize the processing for usage id */ | |
344 | static int __devinit hid_als_remove(struct platform_device *pdev) | |
345 | { | |
346 | struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; | |
347 | struct iio_dev *indio_dev = platform_get_drvdata(pdev); | |
348 | ||
349 | sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ALS); | |
350 | iio_device_unregister(indio_dev); | |
351 | hid_sensor_remove_trigger(indio_dev); | |
352 | iio_triggered_buffer_cleanup(indio_dev); | |
353 | kfree(indio_dev->channels); | |
354 | iio_device_free(indio_dev); | |
355 | ||
356 | return 0; | |
357 | } | |
358 | ||
359 | static struct platform_driver hid_als_platform_driver = { | |
360 | .driver = { | |
361 | .name = DRIVER_NAME, | |
362 | .owner = THIS_MODULE, | |
363 | }, | |
364 | .probe = hid_als_probe, | |
365 | .remove = hid_als_remove, | |
366 | }; | |
367 | module_platform_driver(hid_als_platform_driver); | |
368 | ||
369 | MODULE_DESCRIPTION("HID Sensor ALS"); | |
370 | MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>"); | |
371 | MODULE_LICENSE("GPL"); |