Archana Patni | 39a3a01 | 2014-02-20 06:29:00 +0000 | [diff] [blame] | 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> |
Srinivas Pandruvada | 1eef062 | 2014-04-19 00:22:00 +0100 | [diff] [blame] | 24 | #include <linux/delay.h> |
Archana Patni | 39a3a01 | 2014-02-20 06:29:00 +0000 | [diff] [blame] | 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_PRESENCE 0 |
| 34 | |
| 35 | struct prox_state { |
| 36 | struct hid_sensor_hub_callbacks callbacks; |
| 37 | struct hid_sensor_common common_attributes; |
| 38 | struct hid_sensor_hub_attribute_info prox_attr; |
| 39 | u32 human_presence; |
| 40 | }; |
| 41 | |
| 42 | /* Channel definitions */ |
| 43 | static const struct iio_chan_spec prox_channels[] = { |
| 44 | { |
| 45 | .type = IIO_PROXIMITY, |
Archana Patni | 39a3a01 | 2014-02-20 06:29:00 +0000 | [diff] [blame] | 46 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
| 47 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | |
| 48 | BIT(IIO_CHAN_INFO_SCALE) | |
| 49 | BIT(IIO_CHAN_INFO_SAMP_FREQ) | |
| 50 | BIT(IIO_CHAN_INFO_HYSTERESIS), |
| 51 | .scan_index = CHANNEL_SCAN_INDEX_PRESENCE, |
| 52 | } |
| 53 | }; |
| 54 | |
| 55 | /* Adjust channel real bits based on report descriptor */ |
| 56 | static void prox_adjust_channel_bit_mask(struct iio_chan_spec *channels, |
| 57 | int channel, int size) |
| 58 | { |
| 59 | channels[channel].scan_type.sign = 's'; |
| 60 | /* Real storage bits will change based on the report desc. */ |
| 61 | channels[channel].scan_type.realbits = size * 8; |
| 62 | /* Maximum size of a sample to capture is u32 */ |
| 63 | channels[channel].scan_type.storagebits = sizeof(u32) * 8; |
| 64 | } |
| 65 | |
| 66 | /* Channel read_raw handler */ |
| 67 | static int prox_read_raw(struct iio_dev *indio_dev, |
| 68 | struct iio_chan_spec const *chan, |
| 69 | int *val, int *val2, |
| 70 | long mask) |
| 71 | { |
| 72 | struct prox_state *prox_state = iio_priv(indio_dev); |
| 73 | int report_id = -1; |
| 74 | u32 address; |
Archana Patni | 39a3a01 | 2014-02-20 06:29:00 +0000 | [diff] [blame] | 75 | int ret_type; |
| 76 | |
| 77 | *val = 0; |
| 78 | *val2 = 0; |
| 79 | switch (mask) { |
| 80 | case IIO_CHAN_INFO_RAW: |
| 81 | switch (chan->scan_index) { |
| 82 | case CHANNEL_SCAN_INDEX_PRESENCE: |
| 83 | report_id = prox_state->prox_attr.report_id; |
| 84 | address = |
| 85 | HID_USAGE_SENSOR_HUMAN_PRESENCE; |
| 86 | break; |
| 87 | default: |
| 88 | report_id = -1; |
| 89 | break; |
| 90 | } |
Srinivas Pandruvada | 1eef062 | 2014-04-19 00:22:00 +0100 | [diff] [blame] | 91 | if (report_id >= 0) { |
Srinivas Pandruvada | 1eef062 | 2014-04-19 00:22:00 +0100 | [diff] [blame] | 92 | hid_sensor_power_state(&prox_state->common_attributes, |
| 93 | true); |
Archana Patni | 39a3a01 | 2014-02-20 06:29:00 +0000 | [diff] [blame] | 94 | *val = sensor_hub_input_attr_get_raw_value( |
| 95 | prox_state->common_attributes.hsdev, |
| 96 | HID_USAGE_SENSOR_PROX, address, |
Srinivas Pandruvada | b3f4737 | 2015-02-19 15:33:56 -0800 | [diff] [blame] | 97 | report_id, |
| 98 | SENSOR_HUB_SYNC); |
Srinivas Pandruvada | 1eef062 | 2014-04-19 00:22:00 +0100 | [diff] [blame] | 99 | hid_sensor_power_state(&prox_state->common_attributes, |
| 100 | false); |
| 101 | } else { |
Archana Patni | 39a3a01 | 2014-02-20 06:29:00 +0000 | [diff] [blame] | 102 | *val = 0; |
| 103 | return -EINVAL; |
| 104 | } |
| 105 | ret_type = IIO_VAL_INT; |
| 106 | break; |
| 107 | case IIO_CHAN_INFO_SCALE: |
| 108 | *val = prox_state->prox_attr.units; |
| 109 | ret_type = IIO_VAL_INT; |
| 110 | break; |
| 111 | case IIO_CHAN_INFO_OFFSET: |
| 112 | *val = hid_sensor_convert_exponent( |
| 113 | prox_state->prox_attr.unit_expo); |
| 114 | ret_type = IIO_VAL_INT; |
| 115 | break; |
| 116 | case IIO_CHAN_INFO_SAMP_FREQ: |
Sachin Kamat | 4ff9f63 | 2014-03-07 07:44:00 +0000 | [diff] [blame] | 117 | ret_type = hid_sensor_read_samp_freq_value( |
Archana Patni | 39a3a01 | 2014-02-20 06:29:00 +0000 | [diff] [blame] | 118 | &prox_state->common_attributes, val, val2); |
Archana Patni | 39a3a01 | 2014-02-20 06:29:00 +0000 | [diff] [blame] | 119 | break; |
| 120 | case IIO_CHAN_INFO_HYSTERESIS: |
Sachin Kamat | 4ff9f63 | 2014-03-07 07:44:00 +0000 | [diff] [blame] | 121 | ret_type = hid_sensor_read_raw_hyst_value( |
Archana Patni | 39a3a01 | 2014-02-20 06:29:00 +0000 | [diff] [blame] | 122 | &prox_state->common_attributes, val, val2); |
Archana Patni | 39a3a01 | 2014-02-20 06:29:00 +0000 | [diff] [blame] | 123 | break; |
| 124 | default: |
| 125 | ret_type = -EINVAL; |
| 126 | break; |
| 127 | } |
| 128 | |
| 129 | return ret_type; |
| 130 | } |
| 131 | |
| 132 | /* Channel write_raw handler */ |
| 133 | static int prox_write_raw(struct iio_dev *indio_dev, |
| 134 | struct iio_chan_spec const *chan, |
| 135 | int val, |
| 136 | int val2, |
| 137 | long mask) |
| 138 | { |
| 139 | struct prox_state *prox_state = iio_priv(indio_dev); |
| 140 | int ret = 0; |
| 141 | |
| 142 | switch (mask) { |
| 143 | case IIO_CHAN_INFO_SAMP_FREQ: |
| 144 | ret = hid_sensor_write_samp_freq_value( |
| 145 | &prox_state->common_attributes, val, val2); |
| 146 | break; |
| 147 | case IIO_CHAN_INFO_HYSTERESIS: |
| 148 | ret = hid_sensor_write_raw_hyst_value( |
| 149 | &prox_state->common_attributes, val, val2); |
| 150 | break; |
| 151 | default: |
| 152 | ret = -EINVAL; |
| 153 | } |
| 154 | |
| 155 | return ret; |
| 156 | } |
| 157 | |
| 158 | static const struct iio_info prox_info = { |
| 159 | .driver_module = THIS_MODULE, |
| 160 | .read_raw = &prox_read_raw, |
| 161 | .write_raw = &prox_write_raw, |
| 162 | }; |
| 163 | |
| 164 | /* Function to push data to buffer */ |
| 165 | static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data, |
| 166 | int len) |
| 167 | { |
| 168 | dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); |
| 169 | iio_push_to_buffers(indio_dev, data); |
| 170 | } |
| 171 | |
| 172 | /* Callback handler to send event after all samples are received and captured */ |
| 173 | static int prox_proc_event(struct hid_sensor_hub_device *hsdev, |
| 174 | unsigned usage_id, |
| 175 | void *priv) |
| 176 | { |
| 177 | struct iio_dev *indio_dev = platform_get_drvdata(priv); |
| 178 | struct prox_state *prox_state = iio_priv(indio_dev); |
| 179 | |
Srinivas Pandruvada | 56ff6be | 2014-04-19 00:22:00 +0100 | [diff] [blame] | 180 | dev_dbg(&indio_dev->dev, "prox_proc_event\n"); |
| 181 | if (atomic_read(&prox_state->common_attributes.data_ready)) |
Archana Patni | 39a3a01 | 2014-02-20 06:29:00 +0000 | [diff] [blame] | 182 | hid_sensor_push_data(indio_dev, |
| 183 | &prox_state->human_presence, |
| 184 | sizeof(prox_state->human_presence)); |
| 185 | |
| 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | /* Capture samples in local storage */ |
| 190 | static int prox_capture_sample(struct hid_sensor_hub_device *hsdev, |
| 191 | unsigned usage_id, |
| 192 | size_t raw_len, char *raw_data, |
| 193 | void *priv) |
| 194 | { |
| 195 | struct iio_dev *indio_dev = platform_get_drvdata(priv); |
| 196 | struct prox_state *prox_state = iio_priv(indio_dev); |
| 197 | int ret = -EINVAL; |
| 198 | |
| 199 | switch (usage_id) { |
| 200 | case HID_USAGE_SENSOR_HUMAN_PRESENCE: |
| 201 | prox_state->human_presence = *(u32 *)raw_data; |
| 202 | ret = 0; |
| 203 | break; |
| 204 | default: |
| 205 | break; |
| 206 | } |
| 207 | |
| 208 | return ret; |
| 209 | } |
| 210 | |
| 211 | /* Parse report which is specific to an usage id*/ |
| 212 | static int prox_parse_report(struct platform_device *pdev, |
| 213 | struct hid_sensor_hub_device *hsdev, |
| 214 | struct iio_chan_spec *channels, |
| 215 | unsigned usage_id, |
| 216 | struct prox_state *st) |
| 217 | { |
| 218 | int ret; |
| 219 | |
| 220 | ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT, |
| 221 | usage_id, |
| 222 | HID_USAGE_SENSOR_HUMAN_PRESENCE, |
| 223 | &st->prox_attr); |
| 224 | if (ret < 0) |
| 225 | return ret; |
| 226 | prox_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESENCE, |
| 227 | st->prox_attr.size); |
| 228 | |
| 229 | dev_dbg(&pdev->dev, "prox %x:%x\n", st->prox_attr.index, |
| 230 | st->prox_attr.report_id); |
| 231 | |
| 232 | /* Set Sensitivity field ids, when there is no individual modifier */ |
| 233 | if (st->common_attributes.sensitivity.index < 0) { |
| 234 | sensor_hub_input_get_attribute_info(hsdev, |
| 235 | HID_FEATURE_REPORT, usage_id, |
| 236 | HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS | |
| 237 | HID_USAGE_SENSOR_DATA_PRESENCE, |
| 238 | &st->common_attributes.sensitivity); |
| 239 | dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n", |
| 240 | st->common_attributes.sensitivity.index, |
| 241 | st->common_attributes.sensitivity.report_id); |
| 242 | } |
| 243 | return ret; |
| 244 | } |
| 245 | |
| 246 | /* Function to initialize the processing for usage id */ |
| 247 | static int hid_prox_probe(struct platform_device *pdev) |
| 248 | { |
| 249 | int ret = 0; |
| 250 | static const char *name = "prox"; |
| 251 | struct iio_dev *indio_dev; |
| 252 | struct prox_state *prox_state; |
| 253 | struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; |
Archana Patni | 39a3a01 | 2014-02-20 06:29:00 +0000 | [diff] [blame] | 254 | |
| 255 | indio_dev = devm_iio_device_alloc(&pdev->dev, |
| 256 | sizeof(struct prox_state)); |
| 257 | if (!indio_dev) |
| 258 | return -ENOMEM; |
| 259 | platform_set_drvdata(pdev, indio_dev); |
| 260 | |
| 261 | prox_state = iio_priv(indio_dev); |
| 262 | prox_state->common_attributes.hsdev = hsdev; |
| 263 | prox_state->common_attributes.pdev = pdev; |
| 264 | |
| 265 | ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_PROX, |
| 266 | &prox_state->common_attributes); |
| 267 | if (ret) { |
| 268 | dev_err(&pdev->dev, "failed to setup common attributes\n"); |
| 269 | return ret; |
| 270 | } |
| 271 | |
Fabio Estevam | f0828ba | 2015-05-07 20:32:04 -0300 | [diff] [blame] | 272 | indio_dev->channels = kmemdup(prox_channels, sizeof(prox_channels), |
| 273 | GFP_KERNEL); |
| 274 | if (!indio_dev->channels) { |
Archana Patni | 39a3a01 | 2014-02-20 06:29:00 +0000 | [diff] [blame] | 275 | dev_err(&pdev->dev, "failed to duplicate channels\n"); |
| 276 | return -ENOMEM; |
| 277 | } |
| 278 | |
Fabio Estevam | f0828ba | 2015-05-07 20:32:04 -0300 | [diff] [blame] | 279 | ret = prox_parse_report(pdev, hsdev, |
| 280 | (struct iio_chan_spec *)indio_dev->channels, |
Archana Patni | 39a3a01 | 2014-02-20 06:29:00 +0000 | [diff] [blame] | 281 | HID_USAGE_SENSOR_PROX, prox_state); |
| 282 | if (ret) { |
| 283 | dev_err(&pdev->dev, "failed to setup attributes\n"); |
| 284 | goto error_free_dev_mem; |
| 285 | } |
| 286 | |
Fabio Estevam | 1ca0259 | 2015-05-08 15:54:00 -0300 | [diff] [blame] | 287 | indio_dev->num_channels = ARRAY_SIZE(prox_channels); |
Archana Patni | 39a3a01 | 2014-02-20 06:29:00 +0000 | [diff] [blame] | 288 | indio_dev->dev.parent = &pdev->dev; |
| 289 | indio_dev->info = &prox_info; |
| 290 | indio_dev->name = name; |
| 291 | indio_dev->modes = INDIO_DIRECT_MODE; |
| 292 | |
| 293 | ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, |
| 294 | NULL, NULL); |
| 295 | if (ret) { |
| 296 | dev_err(&pdev->dev, "failed to initialize trigger buffer\n"); |
| 297 | goto error_free_dev_mem; |
| 298 | } |
Srinivas Pandruvada | 56ff6be | 2014-04-19 00:22:00 +0100 | [diff] [blame] | 299 | atomic_set(&prox_state->common_attributes.data_ready, 0); |
Archana Patni | 39a3a01 | 2014-02-20 06:29:00 +0000 | [diff] [blame] | 300 | ret = hid_sensor_setup_trigger(indio_dev, name, |
| 301 | &prox_state->common_attributes); |
| 302 | if (ret) { |
| 303 | dev_err(&pdev->dev, "trigger setup failed\n"); |
| 304 | goto error_unreg_buffer_funcs; |
| 305 | } |
| 306 | |
| 307 | ret = iio_device_register(indio_dev); |
| 308 | if (ret) { |
| 309 | dev_err(&pdev->dev, "device register failed\n"); |
| 310 | goto error_remove_trigger; |
| 311 | } |
| 312 | |
| 313 | prox_state->callbacks.send_event = prox_proc_event; |
| 314 | prox_state->callbacks.capture_sample = prox_capture_sample; |
| 315 | prox_state->callbacks.pdev = pdev; |
| 316 | ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PROX, |
| 317 | &prox_state->callbacks); |
| 318 | if (ret < 0) { |
| 319 | dev_err(&pdev->dev, "callback reg failed\n"); |
| 320 | goto error_iio_unreg; |
| 321 | } |
| 322 | |
| 323 | return ret; |
| 324 | |
| 325 | error_iio_unreg: |
| 326 | iio_device_unregister(indio_dev); |
| 327 | error_remove_trigger: |
| 328 | hid_sensor_remove_trigger(&prox_state->common_attributes); |
| 329 | error_unreg_buffer_funcs: |
| 330 | iio_triggered_buffer_cleanup(indio_dev); |
| 331 | error_free_dev_mem: |
| 332 | kfree(indio_dev->channels); |
| 333 | return ret; |
| 334 | } |
| 335 | |
| 336 | /* Function to deinitialize the processing for usage id */ |
| 337 | static int hid_prox_remove(struct platform_device *pdev) |
| 338 | { |
| 339 | struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; |
| 340 | struct iio_dev *indio_dev = platform_get_drvdata(pdev); |
| 341 | struct prox_state *prox_state = iio_priv(indio_dev); |
| 342 | |
| 343 | sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PROX); |
| 344 | iio_device_unregister(indio_dev); |
| 345 | hid_sensor_remove_trigger(&prox_state->common_attributes); |
| 346 | iio_triggered_buffer_cleanup(indio_dev); |
| 347 | kfree(indio_dev->channels); |
| 348 | |
| 349 | return 0; |
| 350 | } |
| 351 | |
Krzysztof Kozlowski | 4205086 | 2015-05-02 00:53:34 +0900 | [diff] [blame] | 352 | static const struct platform_device_id hid_prox_ids[] = { |
Archana Patni | 39a3a01 | 2014-02-20 06:29:00 +0000 | [diff] [blame] | 353 | { |
| 354 | /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ |
| 355 | .name = "HID-SENSOR-200011", |
| 356 | }, |
| 357 | { /* sentinel */ } |
| 358 | }; |
| 359 | MODULE_DEVICE_TABLE(platform, hid_prox_ids); |
| 360 | |
| 361 | static struct platform_driver hid_prox_platform_driver = { |
| 362 | .id_table = hid_prox_ids, |
| 363 | .driver = { |
| 364 | .name = KBUILD_MODNAME, |
Srinivas Pandruvada | a357b9b | 2015-01-07 10:55:57 -0800 | [diff] [blame] | 365 | .pm = &hid_sensor_pm_ops, |
Archana Patni | 39a3a01 | 2014-02-20 06:29:00 +0000 | [diff] [blame] | 366 | }, |
| 367 | .probe = hid_prox_probe, |
| 368 | .remove = hid_prox_remove, |
| 369 | }; |
| 370 | module_platform_driver(hid_prox_platform_driver); |
| 371 | |
| 372 | MODULE_DESCRIPTION("HID Sensor Proximity"); |
| 373 | MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>"); |
| 374 | MODULE_LICENSE("GPL"); |