mm, page_alloc: set alloc_flags only once in slowpath
[linux/fpc-iii.git] / drivers / iio / pressure / hid-sensor-press.c
blob6848d8c80effcf7c92c44669691b4a55ef3b75e7
1 /*
2 * HID Sensors Driver
3 * Copyright (c) 2014, Intel Corporation.
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.
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.
14 * You should have received a copy of the GNU General Public License along with
15 * this program.
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"
33 #define CHANNEL_SCAN_INDEX_PRESSURE 0
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;
40 int scale_pre_decml;
41 int scale_post_decml;
42 int scale_precision;
43 int value_offset;
46 /* Channel definitions */
47 static const struct iio_chan_spec press_channels[] = {
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,
59 /* Adjust channel real bits based on report descriptor */
60 static void press_adjust_channel_bit_mask(struct iio_chan_spec *channels,
61 int channel, int size)
63 channels[channel].scan_type.sign = 's';
64 /* Real storage bits will change based on the report desc. */
65 channels[channel].scan_type.realbits = size * 8;
66 /* Maximum size of a sample to capture is u32 */
67 channels[channel].scan_type.storagebits = sizeof(u32) * 8;
70 /* Channel read_raw handler */
71 static int press_read_raw(struct iio_dev *indio_dev,
72 struct iio_chan_spec const *chan,
73 int *val, int *val2,
74 long mask)
76 struct press_state *press_state = iio_priv(indio_dev);
77 int report_id = -1;
78 u32 address;
79 int ret_type;
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;
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;
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;
133 return ret_type;
136 /* Channel write_raw handler */
137 static 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)
143 struct press_state *press_state = iio_priv(indio_dev);
144 int ret = 0;
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;
159 return ret;
162 static const struct iio_info press_info = {
163 .driver_module = THIS_MODULE,
164 .read_raw = &press_read_raw,
165 .write_raw = &press_write_raw,
168 /* Function to push data to buffer */
169 static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
170 int len)
172 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
173 iio_push_to_buffers(indio_dev, data);
176 /* Callback handler to send event after all samples are received and captured */
177 static int press_proc_event(struct hid_sensor_hub_device *hsdev,
178 unsigned usage_id,
179 void *priv)
181 struct iio_dev *indio_dev = platform_get_drvdata(priv);
182 struct press_state *press_state = iio_priv(indio_dev);
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));
190 return 0;
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)
199 struct iio_dev *indio_dev = platform_get_drvdata(priv);
200 struct press_state *press_state = iio_priv(indio_dev);
201 int ret = -EINVAL;
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;
212 return ret;
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)
222 int ret;
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);
233 dev_dbg(&pdev->dev, "press %x:%x\n", st->press_attr.index,
234 st->press_attr.report_id);
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);
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);
252 return ret;
255 /* Function to initialize the processing for usage id */
256 static int hid_press_probe(struct platform_device *pdev)
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;
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);
270 press_state = iio_priv(indio_dev);
271 press_state->common_attributes.hsdev = hsdev;
272 press_state->common_attributes.pdev = pdev;
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;
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;
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;
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;
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;
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;
318 ret = iio_device_register(indio_dev);
319 if (ret) {
320 dev_err(&pdev->dev, "device register failed\n");
321 goto error_remove_trigger;
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;
334 return ret;
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;
347 /* Function to deinitialize the processing for usage id */
348 static int hid_press_remove(struct platform_device *pdev)
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);
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);
360 return 0;
363 static const struct platform_device_id hid_press_ids[] = {
365 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
366 .name = "HID-SENSOR-200031",
368 { /* sentinel */ }
370 MODULE_DEVICE_TABLE(platform, hid_press_ids);
372 static 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,
378 .probe = hid_press_probe,
379 .remove = hid_press_remove,
381 module_platform_driver(hid_press_platform_driver);
383 MODULE_DESCRIPTION("HID Sensor Pressure");
384 MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>");
385 MODULE_LICENSE("GPL");