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); 147 148 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 */ 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; 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 } 244 245 indio_dev->channels = devm_kmemdup(&pdev->dev, dev_rot_channels, 246 sizeof(dev_rot_channels), 247 GFP_KERNEL); 248 if (!indio_dev->channels) { 249 dev_err(&pdev->dev, "failed to duplicate channels\n"); 250 return -ENOMEM; 251 } 252 253 ret = dev_rot_parse_report(pdev, hsdev, 254 (struct iio_chan_spec *)indio_dev->channels, 255 HID_USAGE_SENSOR_DEVICE_ORIENTATION, 256 rot_state); 257 if (ret) { 258 dev_err(&pdev->dev, "failed to setup attributes\n"); 259 return ret; 260 } 261 262 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 } 274 atomic_set(&rot_state->common_attributes.data_ready, 0); 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 } 324 325 static const struct platform_device_id hid_dev_rot_ids[] = { 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, 338 }, 339 .probe = hid_dev_rot_probe, 340 .remove = hid_dev_rot_remove, 341 }; 342 module_platform_driver(hid_dev_rot_platform_driver); 343 344 MODULE_DESCRIPTION("HID Sensor Device Rotation"); 345 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); 346 MODULE_LICENSE("GPL"); 347