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-trigger.h" 32 33 enum accel_3d_channel { 34 CHANNEL_SCAN_INDEX_X, 35 CHANNEL_SCAN_INDEX_Y, 36 CHANNEL_SCAN_INDEX_Z, 37 ACCEL_3D_CHANNEL_MAX, 38 }; 39 40 struct accel_3d_state { 41 struct hid_sensor_hub_callbacks callbacks; 42 struct hid_sensor_common common_attributes; 43 struct hid_sensor_hub_attribute_info accel[ACCEL_3D_CHANNEL_MAX]; 44 u32 accel_val[ACCEL_3D_CHANNEL_MAX]; 45 }; 46 47 static const u32 accel_3d_addresses[ACCEL_3D_CHANNEL_MAX] = { 48 HID_USAGE_SENSOR_ACCEL_X_AXIS, 49 HID_USAGE_SENSOR_ACCEL_Y_AXIS, 50 HID_USAGE_SENSOR_ACCEL_Z_AXIS 51 }; 52 53 /* Channel definitions */ 54 static const struct iio_chan_spec accel_3d_channels[] = { 55 { 56 .type = IIO_ACCEL, 57 .modified = 1, 58 .channel2 = IIO_MOD_X, 59 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 60 BIT(IIO_CHAN_INFO_SCALE) | 61 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 62 BIT(IIO_CHAN_INFO_HYSTERESIS), 63 .scan_index = CHANNEL_SCAN_INDEX_X, 64 }, { 65 .type = IIO_ACCEL, 66 .modified = 1, 67 .channel2 = IIO_MOD_Y, 68 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 69 BIT(IIO_CHAN_INFO_SCALE) | 70 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 71 BIT(IIO_CHAN_INFO_HYSTERESIS), 72 .scan_index = CHANNEL_SCAN_INDEX_Y, 73 }, { 74 .type = IIO_ACCEL, 75 .modified = 1, 76 .channel2 = IIO_MOD_Z, 77 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 78 BIT(IIO_CHAN_INFO_SCALE) | 79 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 80 BIT(IIO_CHAN_INFO_HYSTERESIS), 81 .scan_index = CHANNEL_SCAN_INDEX_Z, 82 } 83 }; 84 85 /* Adjust channel real bits based on report descriptor */ 86 static void accel_3d_adjust_channel_bit_mask(struct iio_chan_spec *channels, 87 int channel, int size) 88 { 89 channels[channel].scan_type.sign = 's'; 90 /* Real storage bits will change based on the report desc. */ 91 channels[channel].scan_type.realbits = size * 8; 92 /* Maximum size of a sample to capture is u32 */ 93 channels[channel].scan_type.storagebits = sizeof(u32) * 8; 94 } 95 96 /* Channel read_raw handler */ 97 static int accel_3d_read_raw(struct iio_dev *indio_dev, 98 struct iio_chan_spec const *chan, 99 int *val, int *val2, 100 long mask) 101 { 102 struct accel_3d_state *accel_state = iio_priv(indio_dev); 103 int report_id = -1; 104 u32 address; 105 int ret; 106 int ret_type; 107 108 *val = 0; 109 *val2 = 0; 110 switch (mask) { 111 case 0: 112 report_id = accel_state->accel[chan->scan_index].report_id; 113 address = accel_3d_addresses[chan->scan_index]; 114 if (report_id >= 0) 115 *val = sensor_hub_input_attr_get_raw_value( 116 accel_state->common_attributes.hsdev, 117 HID_USAGE_SENSOR_ACCEL_3D, address, 118 report_id); 119 else { 120 *val = 0; 121 return -EINVAL; 122 } 123 ret_type = IIO_VAL_INT; 124 break; 125 case IIO_CHAN_INFO_SCALE: 126 *val = accel_state->accel[CHANNEL_SCAN_INDEX_X].units; 127 ret_type = IIO_VAL_INT; 128 break; 129 case IIO_CHAN_INFO_OFFSET: 130 *val = hid_sensor_convert_exponent( 131 accel_state->accel[CHANNEL_SCAN_INDEX_X].unit_expo); 132 ret_type = IIO_VAL_INT; 133 break; 134 case IIO_CHAN_INFO_SAMP_FREQ: 135 ret = hid_sensor_read_samp_freq_value( 136 &accel_state->common_attributes, val, val2); 137 ret_type = IIO_VAL_INT_PLUS_MICRO; 138 break; 139 case IIO_CHAN_INFO_HYSTERESIS: 140 ret = hid_sensor_read_raw_hyst_value( 141 &accel_state->common_attributes, val, val2); 142 ret_type = IIO_VAL_INT_PLUS_MICRO; 143 break; 144 default: 145 ret_type = -EINVAL; 146 break; 147 } 148 149 return ret_type; 150 } 151 152 /* Channel write_raw handler */ 153 static int accel_3d_write_raw(struct iio_dev *indio_dev, 154 struct iio_chan_spec const *chan, 155 int val, 156 int val2, 157 long mask) 158 { 159 struct accel_3d_state *accel_state = iio_priv(indio_dev); 160 int ret = 0; 161 162 switch (mask) { 163 case IIO_CHAN_INFO_SAMP_FREQ: 164 ret = hid_sensor_write_samp_freq_value( 165 &accel_state->common_attributes, val, val2); 166 break; 167 case IIO_CHAN_INFO_HYSTERESIS: 168 ret = hid_sensor_write_raw_hyst_value( 169 &accel_state->common_attributes, val, val2); 170 break; 171 default: 172 ret = -EINVAL; 173 } 174 175 return ret; 176 } 177 178 static const struct iio_info accel_3d_info = { 179 .driver_module = THIS_MODULE, 180 .read_raw = &accel_3d_read_raw, 181 .write_raw = &accel_3d_write_raw, 182 }; 183 184 /* Function to push data to buffer */ 185 static void hid_sensor_push_data(struct iio_dev *indio_dev, u8 *data, int len) 186 { 187 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); 188 iio_push_to_buffers(indio_dev, (u8 *)data); 189 } 190 191 /* Callback handler to send event after all samples are received and captured */ 192 static int accel_3d_proc_event(struct hid_sensor_hub_device *hsdev, 193 unsigned usage_id, 194 void *priv) 195 { 196 struct iio_dev *indio_dev = platform_get_drvdata(priv); 197 struct accel_3d_state *accel_state = iio_priv(indio_dev); 198 199 dev_dbg(&indio_dev->dev, "accel_3d_proc_event [%d]\n", 200 accel_state->common_attributes.data_ready); 201 if (accel_state->common_attributes.data_ready) 202 hid_sensor_push_data(indio_dev, 203 (u8 *)accel_state->accel_val, 204 sizeof(accel_state->accel_val)); 205 206 return 0; 207 } 208 209 /* Capture samples in local storage */ 210 static int accel_3d_capture_sample(struct hid_sensor_hub_device *hsdev, 211 unsigned usage_id, 212 size_t raw_len, char *raw_data, 213 void *priv) 214 { 215 struct iio_dev *indio_dev = platform_get_drvdata(priv); 216 struct accel_3d_state *accel_state = iio_priv(indio_dev); 217 int offset; 218 int ret = -EINVAL; 219 220 switch (usage_id) { 221 case HID_USAGE_SENSOR_ACCEL_X_AXIS: 222 case HID_USAGE_SENSOR_ACCEL_Y_AXIS: 223 case HID_USAGE_SENSOR_ACCEL_Z_AXIS: 224 offset = usage_id - HID_USAGE_SENSOR_ACCEL_X_AXIS; 225 accel_state->accel_val[CHANNEL_SCAN_INDEX_X + offset] = 226 *(u32 *)raw_data; 227 ret = 0; 228 break; 229 default: 230 break; 231 } 232 233 return ret; 234 } 235 236 /* Parse report which is specific to an usage id*/ 237 static int accel_3d_parse_report(struct platform_device *pdev, 238 struct hid_sensor_hub_device *hsdev, 239 struct iio_chan_spec *channels, 240 unsigned usage_id, 241 struct accel_3d_state *st) 242 { 243 int ret; 244 int i; 245 246 for (i = 0; i <= CHANNEL_SCAN_INDEX_Z; ++i) { 247 ret = sensor_hub_input_get_attribute_info(hsdev, 248 HID_INPUT_REPORT, 249 usage_id, 250 HID_USAGE_SENSOR_ACCEL_X_AXIS + i, 251 &st->accel[CHANNEL_SCAN_INDEX_X + i]); 252 if (ret < 0) 253 break; 254 accel_3d_adjust_channel_bit_mask(channels, 255 CHANNEL_SCAN_INDEX_X + i, 256 st->accel[CHANNEL_SCAN_INDEX_X + i].size); 257 } 258 dev_dbg(&pdev->dev, "accel_3d %x:%x, %x:%x, %x:%x\n", 259 st->accel[0].index, 260 st->accel[0].report_id, 261 st->accel[1].index, st->accel[1].report_id, 262 st->accel[2].index, st->accel[2].report_id); 263 264 return ret; 265 } 266 267 /* Function to initialize the processing for usage id */ 268 static int hid_accel_3d_probe(struct platform_device *pdev) 269 { 270 int ret = 0; 271 static const char *name = "accel_3d"; 272 struct iio_dev *indio_dev; 273 struct accel_3d_state *accel_state; 274 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 275 struct iio_chan_spec *channels; 276 277 indio_dev = devm_iio_device_alloc(&pdev->dev, 278 sizeof(struct accel_3d_state)); 279 if (indio_dev == NULL) 280 return -ENOMEM; 281 282 platform_set_drvdata(pdev, indio_dev); 283 284 accel_state = iio_priv(indio_dev); 285 accel_state->common_attributes.hsdev = hsdev; 286 accel_state->common_attributes.pdev = pdev; 287 288 ret = hid_sensor_parse_common_attributes(hsdev, 289 HID_USAGE_SENSOR_ACCEL_3D, 290 &accel_state->common_attributes); 291 if (ret) { 292 dev_err(&pdev->dev, "failed to setup common attributes\n"); 293 return ret; 294 } 295 296 channels = kmemdup(accel_3d_channels, sizeof(accel_3d_channels), 297 GFP_KERNEL); 298 if (!channels) { 299 dev_err(&pdev->dev, "failed to duplicate channels\n"); 300 return -ENOMEM; 301 } 302 303 ret = accel_3d_parse_report(pdev, hsdev, channels, 304 HID_USAGE_SENSOR_ACCEL_3D, accel_state); 305 if (ret) { 306 dev_err(&pdev->dev, "failed to setup attributes\n"); 307 goto error_free_dev_mem; 308 } 309 310 indio_dev->channels = channels; 311 indio_dev->num_channels = ARRAY_SIZE(accel_3d_channels); 312 indio_dev->dev.parent = &pdev->dev; 313 indio_dev->info = &accel_3d_info; 314 indio_dev->name = name; 315 indio_dev->modes = INDIO_DIRECT_MODE; 316 317 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, 318 NULL, NULL); 319 if (ret) { 320 dev_err(&pdev->dev, "failed to initialize trigger buffer\n"); 321 goto error_free_dev_mem; 322 } 323 accel_state->common_attributes.data_ready = false; 324 ret = hid_sensor_setup_trigger(indio_dev, name, 325 &accel_state->common_attributes); 326 if (ret < 0) { 327 dev_err(&pdev->dev, "trigger setup failed\n"); 328 goto error_unreg_buffer_funcs; 329 } 330 331 ret = iio_device_register(indio_dev); 332 if (ret) { 333 dev_err(&pdev->dev, "device register failed\n"); 334 goto error_remove_trigger; 335 } 336 337 accel_state->callbacks.send_event = accel_3d_proc_event; 338 accel_state->callbacks.capture_sample = accel_3d_capture_sample; 339 accel_state->callbacks.pdev = pdev; 340 ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ACCEL_3D, 341 &accel_state->callbacks); 342 if (ret < 0) { 343 dev_err(&pdev->dev, "callback reg failed\n"); 344 goto error_iio_unreg; 345 } 346 347 return ret; 348 349 error_iio_unreg: 350 iio_device_unregister(indio_dev); 351 error_remove_trigger: 352 hid_sensor_remove_trigger(indio_dev); 353 error_unreg_buffer_funcs: 354 iio_triggered_buffer_cleanup(indio_dev); 355 error_free_dev_mem: 356 kfree(indio_dev->channels); 357 return ret; 358 } 359 360 /* Function to deinitialize the processing for usage id */ 361 static int hid_accel_3d_remove(struct platform_device *pdev) 362 { 363 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 364 struct iio_dev *indio_dev = platform_get_drvdata(pdev); 365 366 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ACCEL_3D); 367 iio_device_unregister(indio_dev); 368 hid_sensor_remove_trigger(indio_dev); 369 iio_triggered_buffer_cleanup(indio_dev); 370 kfree(indio_dev->channels); 371 372 return 0; 373 } 374 375 static struct platform_device_id hid_accel_3d_ids[] = { 376 { 377 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ 378 .name = "HID-SENSOR-200073", 379 }, 380 { /* sentinel */ } 381 }; 382 MODULE_DEVICE_TABLE(platform, hid_accel_3d_ids); 383 384 static struct platform_driver hid_accel_3d_platform_driver = { 385 .id_table = hid_accel_3d_ids, 386 .driver = { 387 .name = KBUILD_MODNAME, 388 .owner = THIS_MODULE, 389 }, 390 .probe = hid_accel_3d_probe, 391 .remove = hid_accel_3d_remove, 392 }; 393 module_platform_driver(hid_accel_3d_platform_driver); 394 395 MODULE_DESCRIPTION("HID Sensor Accel 3D"); 396 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>"); 397 MODULE_LICENSE("GPL"); 398