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> 24 #include <linux/hid-sensor-hub.h> 25 #include <linux/iio/iio.h> 26 #include <linux/iio/sysfs.h> 27 #include <linux/iio/buffer.h> 28 #include <linux/iio/trigger_consumer.h> 29 #include <linux/iio/triggered_buffer.h> 30 #include "../common/hid-sensors/hid-sensor-trigger.h" 31 32 #define CHANNEL_SCAN_INDEX_PRESSURE 0 33 34 struct press_state { 35 struct hid_sensor_hub_callbacks callbacks; 36 struct hid_sensor_common common_attributes; 37 struct hid_sensor_hub_attribute_info press_attr; 38 u32 press_data; 39 }; 40 41 /* Channel definitions */ 42 static const struct iio_chan_spec press_channels[] = { 43 { 44 .type = IIO_PRESSURE, 45 .modified = 1, 46 .channel2 = IIO_NO_MOD, 47 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 48 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 49 BIT(IIO_CHAN_INFO_SCALE) | 50 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 51 BIT(IIO_CHAN_INFO_HYSTERESIS), 52 .scan_index = CHANNEL_SCAN_INDEX_PRESSURE, 53 } 54 }; 55 56 /* Adjust channel real bits based on report descriptor */ 57 static void press_adjust_channel_bit_mask(struct iio_chan_spec *channels, 58 int channel, int size) 59 { 60 channels[channel].scan_type.sign = 's'; 61 /* Real storage bits will change based on the report desc. */ 62 channels[channel].scan_type.realbits = size * 8; 63 /* Maximum size of a sample to capture is u32 */ 64 channels[channel].scan_type.storagebits = sizeof(u32) * 8; 65 } 66 67 /* Channel read_raw handler */ 68 static int press_read_raw(struct iio_dev *indio_dev, 69 struct iio_chan_spec const *chan, 70 int *val, int *val2, 71 long mask) 72 { 73 struct press_state *press_state = iio_priv(indio_dev); 74 int report_id = -1; 75 u32 address; 76 int ret; 77 int ret_type; 78 79 *val = 0; 80 *val2 = 0; 81 switch (mask) { 82 case IIO_CHAN_INFO_RAW: 83 switch (chan->scan_index) { 84 case CHANNEL_SCAN_INDEX_PRESSURE: 85 report_id = press_state->press_attr.report_id; 86 address = 87 HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE; 88 break; 89 default: 90 report_id = -1; 91 break; 92 } 93 if (report_id >= 0) 94 *val = sensor_hub_input_attr_get_raw_value( 95 press_state->common_attributes.hsdev, 96 HID_USAGE_SENSOR_PRESSURE, address, 97 report_id); 98 else { 99 *val = 0; 100 return -EINVAL; 101 } 102 ret_type = IIO_VAL_INT; 103 break; 104 case IIO_CHAN_INFO_SCALE: 105 *val = press_state->press_attr.units; 106 ret_type = IIO_VAL_INT; 107 break; 108 case IIO_CHAN_INFO_OFFSET: 109 *val = hid_sensor_convert_exponent( 110 press_state->press_attr.unit_expo); 111 ret_type = IIO_VAL_INT; 112 break; 113 case IIO_CHAN_INFO_SAMP_FREQ: 114 ret = hid_sensor_read_samp_freq_value( 115 &press_state->common_attributes, val, val2); 116 ret_type = IIO_VAL_INT_PLUS_MICRO; 117 break; 118 case IIO_CHAN_INFO_HYSTERESIS: 119 ret = hid_sensor_read_raw_hyst_value( 120 &press_state->common_attributes, val, val2); 121 ret_type = IIO_VAL_INT_PLUS_MICRO; 122 break; 123 default: 124 ret_type = -EINVAL; 125 break; 126 } 127 128 return ret_type; 129 } 130 131 /* Channel write_raw handler */ 132 static int press_write_raw(struct iio_dev *indio_dev, 133 struct iio_chan_spec const *chan, 134 int val, 135 int val2, 136 long mask) 137 { 138 struct press_state *press_state = iio_priv(indio_dev); 139 int ret = 0; 140 141 switch (mask) { 142 case IIO_CHAN_INFO_SAMP_FREQ: 143 ret = hid_sensor_write_samp_freq_value( 144 &press_state->common_attributes, val, val2); 145 break; 146 case IIO_CHAN_INFO_HYSTERESIS: 147 ret = hid_sensor_write_raw_hyst_value( 148 &press_state->common_attributes, val, val2); 149 break; 150 default: 151 ret = -EINVAL; 152 } 153 154 return ret; 155 } 156 157 static const struct iio_info press_info = { 158 .driver_module = THIS_MODULE, 159 .read_raw = &press_read_raw, 160 .write_raw = &press_write_raw, 161 }; 162 163 /* Function to push data to buffer */ 164 static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data, 165 int len) 166 { 167 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); 168 iio_push_to_buffers(indio_dev, data); 169 } 170 171 /* Callback handler to send event after all samples are received and captured */ 172 static int press_proc_event(struct hid_sensor_hub_device *hsdev, 173 unsigned usage_id, 174 void *priv) 175 { 176 struct iio_dev *indio_dev = platform_get_drvdata(priv); 177 struct press_state *press_state = iio_priv(indio_dev); 178 179 dev_dbg(&indio_dev->dev, "press_proc_event [%d]\n", 180 press_state->common_attributes.data_ready); 181 if (press_state->common_attributes.data_ready) 182 hid_sensor_push_data(indio_dev, 183 &press_state->press_data, 184 sizeof(press_state->press_data)); 185 186 return 0; 187 } 188 189 /* Capture samples in local storage */ 190 static int press_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 press_state *press_state = iio_priv(indio_dev); 197 int ret = -EINVAL; 198 199 switch (usage_id) { 200 case HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE: 201 press_state->press_data = *(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 press_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 press_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_ATMOSPHERIC_PRESSURE, 223 &st->press_attr); 224 if (ret < 0) 225 return ret; 226 press_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESSURE, 227 st->press_attr.size); 228 229 dev_dbg(&pdev->dev, "press %x:%x\n", st->press_attr.index, 230 st->press_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_ATMOSPHERIC_PRESSURE, 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_press_probe(struct platform_device *pdev) 248 { 249 int ret = 0; 250 static const char *name = "press"; 251 struct iio_dev *indio_dev; 252 struct press_state *press_state; 253 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 254 struct iio_chan_spec *channels; 255 256 indio_dev = devm_iio_device_alloc(&pdev->dev, 257 sizeof(struct press_state)); 258 if (!indio_dev) 259 return -ENOMEM; 260 platform_set_drvdata(pdev, indio_dev); 261 262 press_state = iio_priv(indio_dev); 263 press_state->common_attributes.hsdev = hsdev; 264 press_state->common_attributes.pdev = pdev; 265 266 ret = hid_sensor_parse_common_attributes(hsdev, 267 HID_USAGE_SENSOR_PRESSURE, 268 &press_state->common_attributes); 269 if (ret) { 270 dev_err(&pdev->dev, "failed to setup common attributes\n"); 271 return ret; 272 } 273 274 channels = kmemdup(press_channels, sizeof(press_channels), GFP_KERNEL); 275 if (!channels) { 276 dev_err(&pdev->dev, "failed to duplicate channels\n"); 277 return -ENOMEM; 278 } 279 280 ret = press_parse_report(pdev, hsdev, channels, 281 HID_USAGE_SENSOR_PRESSURE, press_state); 282 if (ret) { 283 dev_err(&pdev->dev, "failed to setup attributes\n"); 284 goto error_free_dev_mem; 285 } 286 287 indio_dev->channels = channels; 288 indio_dev->num_channels = 289 ARRAY_SIZE(press_channels); 290 indio_dev->dev.parent = &pdev->dev; 291 indio_dev->info = &press_info; 292 indio_dev->name = name; 293 indio_dev->modes = INDIO_DIRECT_MODE; 294 295 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, 296 NULL, NULL); 297 if (ret) { 298 dev_err(&pdev->dev, "failed to initialize trigger buffer\n"); 299 goto error_free_dev_mem; 300 } 301 press_state->common_attributes.data_ready = false; 302 ret = hid_sensor_setup_trigger(indio_dev, name, 303 &press_state->common_attributes); 304 if (ret) { 305 dev_err(&pdev->dev, "trigger setup failed\n"); 306 goto error_unreg_buffer_funcs; 307 } 308 309 ret = iio_device_register(indio_dev); 310 if (ret) { 311 dev_err(&pdev->dev, "device register failed\n"); 312 goto error_remove_trigger; 313 } 314 315 press_state->callbacks.send_event = press_proc_event; 316 press_state->callbacks.capture_sample = press_capture_sample; 317 press_state->callbacks.pdev = pdev; 318 ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PRESSURE, 319 &press_state->callbacks); 320 if (ret < 0) { 321 dev_err(&pdev->dev, "callback reg failed\n"); 322 goto error_iio_unreg; 323 } 324 325 return ret; 326 327 error_iio_unreg: 328 iio_device_unregister(indio_dev); 329 error_remove_trigger: 330 hid_sensor_remove_trigger(&press_state->common_attributes); 331 error_unreg_buffer_funcs: 332 iio_triggered_buffer_cleanup(indio_dev); 333 error_free_dev_mem: 334 kfree(indio_dev->channels); 335 return ret; 336 } 337 338 /* Function to deinitialize the processing for usage id */ 339 static int hid_press_remove(struct platform_device *pdev) 340 { 341 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 342 struct iio_dev *indio_dev = platform_get_drvdata(pdev); 343 struct press_state *press_state = iio_priv(indio_dev); 344 345 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PRESSURE); 346 iio_device_unregister(indio_dev); 347 hid_sensor_remove_trigger(&press_state->common_attributes); 348 iio_triggered_buffer_cleanup(indio_dev); 349 kfree(indio_dev->channels); 350 351 return 0; 352 } 353 354 static struct platform_device_id hid_press_ids[] = { 355 { 356 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ 357 .name = "HID-SENSOR-200031", 358 }, 359 { /* sentinel */ } 360 }; 361 MODULE_DEVICE_TABLE(platform, hid_press_ids); 362 363 static struct platform_driver hid_press_platform_driver = { 364 .id_table = hid_press_ids, 365 .driver = { 366 .name = KBUILD_MODNAME, 367 .owner = THIS_MODULE, 368 }, 369 .probe = hid_press_probe, 370 .remove = hid_press_remove, 371 }; 372 module_platform_driver(hid_press_platform_driver); 373 374 MODULE_DESCRIPTION("HID Sensor Pressure"); 375 MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>"); 376 MODULE_LICENSE("GPL"); 377