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 29struct 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 */ 37static 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 */ 49static 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 */ 61static 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 */ 100static 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 125static 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 */ 132static 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 */ 141static 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); 147 148 dev_dbg(&indio_dev->dev, "dev_rot_proc_event\n"); 149 if (atomic_read(&rot_state->common_attributes.data_ready)) 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 */ 158static 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*/ 177static 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 */ 218static 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; 225 struct iio_chan_spec *channels; 226 227 indio_dev = devm_iio_device_alloc(&pdev->dev, 228 sizeof(struct dev_rot_state)); 229 if (indio_dev == NULL) 230 return -ENOMEM; 231 232 platform_set_drvdata(pdev, indio_dev); 233 234 rot_state = iio_priv(indio_dev); 235 rot_state->common_attributes.hsdev = hsdev; 236 rot_state->common_attributes.pdev = pdev; 237 238 ret = hid_sensor_parse_common_attributes(hsdev, 239 HID_USAGE_SENSOR_DEVICE_ORIENTATION, 240 &rot_state->common_attributes); 241 if (ret) { 242 dev_err(&pdev->dev, "failed to setup common attributes\n"); 243 return ret; 244 } 245 246 channels = devm_kmemdup(&pdev->dev, dev_rot_channels, 247 sizeof(dev_rot_channels), GFP_KERNEL); 248 if (!channels) { 249 dev_err(&pdev->dev, "failed to duplicate channels\n"); 250 return -ENOMEM; 251 } 252 253 ret = dev_rot_parse_report(pdev, hsdev, channels, 254 HID_USAGE_SENSOR_DEVICE_ORIENTATION, rot_state); 255 if (ret) { 256 dev_err(&pdev->dev, "failed to setup attributes\n"); 257 return ret; 258 } 259 260 indio_dev->channels = channels; 261 indio_dev->num_channels = ARRAY_SIZE(dev_rot_channels); 262 indio_dev->dev.parent = &pdev->dev; 263 indio_dev->info = &dev_rot_info; 264 indio_dev->name = name; 265 indio_dev->modes = INDIO_DIRECT_MODE; 266 267 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, 268 NULL, NULL); 269 if (ret) { 270 dev_err(&pdev->dev, "failed to initialize trigger buffer\n"); 271 return ret; 272 } 273 atomic_set(&rot_state->common_attributes.data_ready, 0); 274 ret = hid_sensor_setup_trigger(indio_dev, name, 275 &rot_state->common_attributes); 276 if (ret) { 277 dev_err(&pdev->dev, "trigger setup failed\n"); 278 goto error_unreg_buffer_funcs; 279 } 280 281 ret = iio_device_register(indio_dev); 282 if (ret) { 283 dev_err(&pdev->dev, "device register failed\n"); 284 goto error_remove_trigger; 285 } 286 287 rot_state->callbacks.send_event = dev_rot_proc_event; 288 rot_state->callbacks.capture_sample = dev_rot_capture_sample; 289 rot_state->callbacks.pdev = pdev; 290 ret = sensor_hub_register_callback(hsdev, 291 HID_USAGE_SENSOR_DEVICE_ORIENTATION, 292 &rot_state->callbacks); 293 if (ret) { 294 dev_err(&pdev->dev, "callback reg failed\n"); 295 goto error_iio_unreg; 296 } 297 298 return 0; 299 300error_iio_unreg: 301 iio_device_unregister(indio_dev); 302error_remove_trigger: 303 hid_sensor_remove_trigger(&rot_state->common_attributes); 304error_unreg_buffer_funcs: 305 iio_triggered_buffer_cleanup(indio_dev); 306 return ret; 307} 308 309/* Function to deinitialize the processing for usage id */ 310static int hid_dev_rot_remove(struct platform_device *pdev) 311{ 312 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 313 struct iio_dev *indio_dev = platform_get_drvdata(pdev); 314 struct dev_rot_state *rot_state = iio_priv(indio_dev); 315 316 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_DEVICE_ORIENTATION); 317 iio_device_unregister(indio_dev); 318 hid_sensor_remove_trigger(&rot_state->common_attributes); 319 iio_triggered_buffer_cleanup(indio_dev); 320 321 return 0; 322} 323 324static struct platform_device_id hid_dev_rot_ids[] = { 325 { 326 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ 327 .name = "HID-SENSOR-20008a", 328 }, 329 { /* sentinel */ } 330}; 331MODULE_DEVICE_TABLE(platform, hid_dev_rot_ids); 332 333static struct platform_driver hid_dev_rot_platform_driver = { 334 .id_table = hid_dev_rot_ids, 335 .driver = { 336 .name = KBUILD_MODNAME, 337 }, 338 .probe = hid_dev_rot_probe, 339 .remove = hid_dev_rot_remove, 340}; 341module_platform_driver(hid_dev_rot_platform_driver); 342 343MODULE_DESCRIPTION("HID Sensor Device Rotation"); 344MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); 345MODULE_LICENSE("GPL"); 346