1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * HID Sensors Driver 4 * Copyright (c) 2014, Intel Corporation. 5 */ 6 #include <linux/device.h> 7 #include <linux/platform_device.h> 8 #include <linux/module.h> 9 #include <linux/interrupt.h> 10 #include <linux/irq.h> 11 #include <linux/slab.h> 12 #include <linux/delay.h> 13 #include <linux/hid-sensor-hub.h> 14 #include <linux/iio/iio.h> 15 #include <linux/iio/sysfs.h> 16 #include <linux/iio/buffer.h> 17 #include "../common/hid-sensors/hid-sensor-trigger.h" 18 19 #define CHANNEL_SCAN_INDEX_PRESSURE 0 20 21 struct press_state { 22 struct hid_sensor_hub_callbacks callbacks; 23 struct hid_sensor_common common_attributes; 24 struct hid_sensor_hub_attribute_info press_attr; 25 u32 press_data; 26 int scale_pre_decml; 27 int scale_post_decml; 28 int scale_precision; 29 int value_offset; 30 }; 31 32 static const u32 press_sensitivity_addresses[] = { 33 HID_USAGE_SENSOR_DATA_ATMOSPHERIC_PRESSURE, 34 }; 35 36 /* Channel definitions */ 37 static const struct iio_chan_spec press_channels[] = { 38 { 39 .type = IIO_PRESSURE, 40 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 41 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | 42 BIT(IIO_CHAN_INFO_SCALE) | 43 BIT(IIO_CHAN_INFO_SAMP_FREQ) | 44 BIT(IIO_CHAN_INFO_HYSTERESIS), 45 .scan_index = CHANNEL_SCAN_INDEX_PRESSURE, 46 } 47 }; 48 49 /* Adjust channel real bits based on report descriptor */ 50 static void press_adjust_channel_bit_mask(struct iio_chan_spec *channels, 51 int channel, int size) 52 { 53 channels[channel].scan_type.sign = 's'; 54 /* Real storage bits will change based on the report desc. */ 55 channels[channel].scan_type.realbits = size * 8; 56 /* Maximum size of a sample to capture is u32 */ 57 channels[channel].scan_type.storagebits = sizeof(u32) * 8; 58 } 59 60 /* Channel read_raw handler */ 61 static int press_read_raw(struct iio_dev *indio_dev, 62 struct iio_chan_spec const *chan, 63 int *val, int *val2, 64 long mask) 65 { 66 struct press_state *press_state = iio_priv(indio_dev); 67 int report_id = -1; 68 u32 address; 69 int ret_type; 70 s32 min; 71 72 *val = 0; 73 *val2 = 0; 74 switch (mask) { 75 case IIO_CHAN_INFO_RAW: 76 switch (chan->scan_index) { 77 case CHANNEL_SCAN_INDEX_PRESSURE: 78 report_id = press_state->press_attr.report_id; 79 min = press_state->press_attr.logical_minimum; 80 address = HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE; 81 break; 82 default: 83 report_id = -1; 84 break; 85 } 86 if (report_id >= 0) { 87 hid_sensor_power_state(&press_state->common_attributes, 88 true); 89 *val = sensor_hub_input_attr_get_raw_value( 90 press_state->common_attributes.hsdev, 91 HID_USAGE_SENSOR_PRESSURE, address, 92 report_id, 93 SENSOR_HUB_SYNC, 94 min < 0); 95 hid_sensor_power_state(&press_state->common_attributes, 96 false); 97 } else { 98 *val = 0; 99 return -EINVAL; 100 } 101 ret_type = IIO_VAL_INT; 102 break; 103 case IIO_CHAN_INFO_SCALE: 104 *val = press_state->scale_pre_decml; 105 *val2 = press_state->scale_post_decml; 106 ret_type = press_state->scale_precision; 107 break; 108 case IIO_CHAN_INFO_OFFSET: 109 *val = press_state->value_offset; 110 ret_type = IIO_VAL_INT; 111 break; 112 case IIO_CHAN_INFO_SAMP_FREQ: 113 ret_type = hid_sensor_read_samp_freq_value( 114 &press_state->common_attributes, val, val2); 115 break; 116 case IIO_CHAN_INFO_HYSTERESIS: 117 ret_type = hid_sensor_read_raw_hyst_value( 118 &press_state->common_attributes, val, val2); 119 break; 120 default: 121 ret_type = -EINVAL; 122 break; 123 } 124 125 return ret_type; 126 } 127 128 /* Channel write_raw handler */ 129 static int press_write_raw(struct iio_dev *indio_dev, 130 struct iio_chan_spec const *chan, 131 int val, 132 int val2, 133 long mask) 134 { 135 struct press_state *press_state = iio_priv(indio_dev); 136 int ret = 0; 137 138 switch (mask) { 139 case IIO_CHAN_INFO_SAMP_FREQ: 140 ret = hid_sensor_write_samp_freq_value( 141 &press_state->common_attributes, val, val2); 142 break; 143 case IIO_CHAN_INFO_HYSTERESIS: 144 ret = hid_sensor_write_raw_hyst_value( 145 &press_state->common_attributes, val, val2); 146 break; 147 default: 148 ret = -EINVAL; 149 } 150 151 return ret; 152 } 153 154 static const struct iio_info press_info = { 155 .read_raw = &press_read_raw, 156 .write_raw = &press_write_raw, 157 }; 158 159 /* Function to push data to buffer */ 160 static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data, 161 int len) 162 { 163 dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); 164 iio_push_to_buffers(indio_dev, data); 165 } 166 167 /* Callback handler to send event after all samples are received and captured */ 168 static int press_proc_event(struct hid_sensor_hub_device *hsdev, 169 unsigned usage_id, 170 void *priv) 171 { 172 struct iio_dev *indio_dev = platform_get_drvdata(priv); 173 struct press_state *press_state = iio_priv(indio_dev); 174 175 dev_dbg(&indio_dev->dev, "press_proc_event\n"); 176 if (atomic_read(&press_state->common_attributes.data_ready)) 177 hid_sensor_push_data(indio_dev, 178 &press_state->press_data, 179 sizeof(press_state->press_data)); 180 181 return 0; 182 } 183 184 /* Capture samples in local storage */ 185 static int press_capture_sample(struct hid_sensor_hub_device *hsdev, 186 unsigned usage_id, 187 size_t raw_len, char *raw_data, 188 void *priv) 189 { 190 struct iio_dev *indio_dev = platform_get_drvdata(priv); 191 struct press_state *press_state = iio_priv(indio_dev); 192 int ret = -EINVAL; 193 194 switch (usage_id) { 195 case HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE: 196 press_state->press_data = *(u32 *)raw_data; 197 ret = 0; 198 break; 199 default: 200 break; 201 } 202 203 return ret; 204 } 205 206 /* Parse report which is specific to an usage id*/ 207 static int press_parse_report(struct platform_device *pdev, 208 struct hid_sensor_hub_device *hsdev, 209 struct iio_chan_spec *channels, 210 unsigned usage_id, 211 struct press_state *st) 212 { 213 int ret; 214 215 ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT, 216 usage_id, 217 HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE, 218 &st->press_attr); 219 if (ret < 0) 220 return ret; 221 press_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESSURE, 222 st->press_attr.size); 223 224 dev_dbg(&pdev->dev, "press %x:%x\n", st->press_attr.index, 225 st->press_attr.report_id); 226 227 st->scale_precision = hid_sensor_format_scale( 228 HID_USAGE_SENSOR_PRESSURE, 229 &st->press_attr, 230 &st->scale_pre_decml, &st->scale_post_decml); 231 232 return ret; 233 } 234 235 /* Function to initialize the processing for usage id */ 236 static int hid_press_probe(struct platform_device *pdev) 237 { 238 int ret = 0; 239 static const char *name = "press"; 240 struct iio_dev *indio_dev; 241 struct press_state *press_state; 242 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 243 244 indio_dev = devm_iio_device_alloc(&pdev->dev, 245 sizeof(struct press_state)); 246 if (!indio_dev) 247 return -ENOMEM; 248 platform_set_drvdata(pdev, indio_dev); 249 250 press_state = iio_priv(indio_dev); 251 press_state->common_attributes.hsdev = hsdev; 252 press_state->common_attributes.pdev = pdev; 253 254 ret = hid_sensor_parse_common_attributes(hsdev, 255 HID_USAGE_SENSOR_PRESSURE, 256 &press_state->common_attributes, 257 press_sensitivity_addresses, 258 ARRAY_SIZE(press_sensitivity_addresses)); 259 if (ret) { 260 dev_err(&pdev->dev, "failed to setup common attributes\n"); 261 return ret; 262 } 263 264 indio_dev->channels = kmemdup(press_channels, sizeof(press_channels), 265 GFP_KERNEL); 266 if (!indio_dev->channels) { 267 dev_err(&pdev->dev, "failed to duplicate channels\n"); 268 return -ENOMEM; 269 } 270 271 ret = press_parse_report(pdev, hsdev, 272 (struct iio_chan_spec *)indio_dev->channels, 273 HID_USAGE_SENSOR_PRESSURE, press_state); 274 if (ret) { 275 dev_err(&pdev->dev, "failed to setup attributes\n"); 276 goto error_free_dev_mem; 277 } 278 279 indio_dev->num_channels = 280 ARRAY_SIZE(press_channels); 281 indio_dev->info = &press_info; 282 indio_dev->name = name; 283 indio_dev->modes = INDIO_DIRECT_MODE; 284 285 atomic_set(&press_state->common_attributes.data_ready, 0); 286 287 ret = hid_sensor_setup_trigger(indio_dev, name, 288 &press_state->common_attributes); 289 if (ret) { 290 dev_err(&pdev->dev, "trigger setup failed\n"); 291 goto error_free_dev_mem; 292 } 293 294 ret = iio_device_register(indio_dev); 295 if (ret) { 296 dev_err(&pdev->dev, "device register failed\n"); 297 goto error_remove_trigger; 298 } 299 300 press_state->callbacks.send_event = press_proc_event; 301 press_state->callbacks.capture_sample = press_capture_sample; 302 press_state->callbacks.pdev = pdev; 303 ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PRESSURE, 304 &press_state->callbacks); 305 if (ret < 0) { 306 dev_err(&pdev->dev, "callback reg failed\n"); 307 goto error_iio_unreg; 308 } 309 310 return ret; 311 312 error_iio_unreg: 313 iio_device_unregister(indio_dev); 314 error_remove_trigger: 315 hid_sensor_remove_trigger(indio_dev, &press_state->common_attributes); 316 error_free_dev_mem: 317 kfree(indio_dev->channels); 318 return ret; 319 } 320 321 /* Function to deinitialize the processing for usage id */ 322 static int hid_press_remove(struct platform_device *pdev) 323 { 324 struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; 325 struct iio_dev *indio_dev = platform_get_drvdata(pdev); 326 struct press_state *press_state = iio_priv(indio_dev); 327 328 sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PRESSURE); 329 iio_device_unregister(indio_dev); 330 hid_sensor_remove_trigger(indio_dev, &press_state->common_attributes); 331 kfree(indio_dev->channels); 332 333 return 0; 334 } 335 336 static const struct platform_device_id hid_press_ids[] = { 337 { 338 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */ 339 .name = "HID-SENSOR-200031", 340 }, 341 { /* sentinel */ } 342 }; 343 MODULE_DEVICE_TABLE(platform, hid_press_ids); 344 345 static struct platform_driver hid_press_platform_driver = { 346 .id_table = hid_press_ids, 347 .driver = { 348 .name = KBUILD_MODNAME, 349 .pm = &hid_sensor_pm_ops, 350 }, 351 .probe = hid_press_probe, 352 .remove = hid_press_remove, 353 }; 354 module_platform_driver(hid_press_platform_driver); 355 356 MODULE_DESCRIPTION("HID Sensor Pressure"); 357 MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>"); 358 MODULE_LICENSE("GPL"); 359