1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * mma8452.c - Support for following Freescale / NXP 3-axis accelerometers: 4 * 5 * device name digital output 7-bit I2C slave address (pin selectable) 6 * --------------------------------------------------------------------- 7 * MMA8451Q 14 bit 0x1c / 0x1d 8 * MMA8452Q 12 bit 0x1c / 0x1d 9 * MMA8453Q 10 bit 0x1c / 0x1d 10 * MMA8652FC 12 bit 0x1d 11 * MMA8653FC 10 bit 0x1d 12 * FXLS8471Q 14 bit 0x1e / 0x1d / 0x1c / 0x1f 13 * 14 * Copyright 2015 Martin Kepplinger <martink@posteo.de> 15 * Copyright 2014 Peter Meerwald <pmeerw@pmeerw.net> 16 * 17 * 18 * TODO: orientation events 19 */ 20 21 #include <linux/module.h> 22 #include <linux/i2c.h> 23 #include <linux/iio/iio.h> 24 #include <linux/iio/sysfs.h> 25 #include <linux/iio/buffer.h> 26 #include <linux/iio/trigger.h> 27 #include <linux/iio/trigger_consumer.h> 28 #include <linux/iio/triggered_buffer.h> 29 #include <linux/iio/events.h> 30 #include <linux/delay.h> 31 #include <linux/of_device.h> 32 #include <linux/of_irq.h> 33 #include <linux/pm_runtime.h> 34 #include <linux/regulator/consumer.h> 35 36 #define MMA8452_STATUS 0x00 37 #define MMA8452_STATUS_DRDY (BIT(2) | BIT(1) | BIT(0)) 38 #define MMA8452_OUT_X 0x01 /* MSB first */ 39 #define MMA8452_OUT_Y 0x03 40 #define MMA8452_OUT_Z 0x05 41 #define MMA8452_INT_SRC 0x0c 42 #define MMA8452_WHO_AM_I 0x0d 43 #define MMA8452_DATA_CFG 0x0e 44 #define MMA8452_DATA_CFG_FS_MASK GENMASK(1, 0) 45 #define MMA8452_DATA_CFG_FS_2G 0 46 #define MMA8452_DATA_CFG_FS_4G 1 47 #define MMA8452_DATA_CFG_FS_8G 2 48 #define MMA8452_DATA_CFG_HPF_MASK BIT(4) 49 #define MMA8452_HP_FILTER_CUTOFF 0x0f 50 #define MMA8452_HP_FILTER_CUTOFF_SEL_MASK GENMASK(1, 0) 51 #define MMA8452_FF_MT_CFG 0x15 52 #define MMA8452_FF_MT_CFG_OAE BIT(6) 53 #define MMA8452_FF_MT_CFG_ELE BIT(7) 54 #define MMA8452_FF_MT_SRC 0x16 55 #define MMA8452_FF_MT_SRC_XHE BIT(1) 56 #define MMA8452_FF_MT_SRC_YHE BIT(3) 57 #define MMA8452_FF_MT_SRC_ZHE BIT(5) 58 #define MMA8452_FF_MT_THS 0x17 59 #define MMA8452_FF_MT_THS_MASK 0x7f 60 #define MMA8452_FF_MT_COUNT 0x18 61 #define MMA8452_FF_MT_CHAN_SHIFT 3 62 #define MMA8452_TRANSIENT_CFG 0x1d 63 #define MMA8452_TRANSIENT_CFG_CHAN(chan) BIT(chan + 1) 64 #define MMA8452_TRANSIENT_CFG_HPF_BYP BIT(0) 65 #define MMA8452_TRANSIENT_CFG_ELE BIT(4) 66 #define MMA8452_TRANSIENT_SRC 0x1e 67 #define MMA8452_TRANSIENT_SRC_XTRANSE BIT(1) 68 #define MMA8452_TRANSIENT_SRC_YTRANSE BIT(3) 69 #define MMA8452_TRANSIENT_SRC_ZTRANSE BIT(5) 70 #define MMA8452_TRANSIENT_THS 0x1f 71 #define MMA8452_TRANSIENT_THS_MASK GENMASK(6, 0) 72 #define MMA8452_TRANSIENT_COUNT 0x20 73 #define MMA8452_TRANSIENT_CHAN_SHIFT 1 74 #define MMA8452_CTRL_REG1 0x2a 75 #define MMA8452_CTRL_ACTIVE BIT(0) 76 #define MMA8452_CTRL_DR_MASK GENMASK(5, 3) 77 #define MMA8452_CTRL_DR_SHIFT 3 78 #define MMA8452_CTRL_DR_DEFAULT 0x4 /* 50 Hz sample frequency */ 79 #define MMA8452_CTRL_REG2 0x2b 80 #define MMA8452_CTRL_REG2_RST BIT(6) 81 #define MMA8452_CTRL_REG2_MODS_SHIFT 3 82 #define MMA8452_CTRL_REG2_MODS_MASK 0x1b 83 #define MMA8452_CTRL_REG4 0x2d 84 #define MMA8452_CTRL_REG5 0x2e 85 #define MMA8452_OFF_X 0x2f 86 #define MMA8452_OFF_Y 0x30 87 #define MMA8452_OFF_Z 0x31 88 89 #define MMA8452_MAX_REG 0x31 90 91 #define MMA8452_INT_DRDY BIT(0) 92 #define MMA8452_INT_FF_MT BIT(2) 93 #define MMA8452_INT_TRANS BIT(5) 94 95 #define MMA8451_DEVICE_ID 0x1a 96 #define MMA8452_DEVICE_ID 0x2a 97 #define MMA8453_DEVICE_ID 0x3a 98 #define MMA8652_DEVICE_ID 0x4a 99 #define MMA8653_DEVICE_ID 0x5a 100 #define FXLS8471_DEVICE_ID 0x6a 101 102 #define MMA8452_AUTO_SUSPEND_DELAY_MS 2000 103 104 struct mma8452_data { 105 struct i2c_client *client; 106 struct mutex lock; 107 struct iio_mount_matrix orientation; 108 u8 ctrl_reg1; 109 u8 data_cfg; 110 const struct mma_chip_info *chip_info; 111 int sleep_val; 112 struct regulator *vdd_reg; 113 struct regulator *vddio_reg; 114 115 /* Ensure correct alignment of time stamp when present */ 116 struct { 117 __be16 channels[3]; 118 s64 ts __aligned(8); 119 } buffer; 120 }; 121 122 /** 123 * struct mma8452_event_regs - chip specific data related to events 124 * @ev_cfg: event config register address 125 * @ev_cfg_ele: latch bit in event config register 126 * @ev_cfg_chan_shift: number of the bit to enable events in X 127 * direction; in event config register 128 * @ev_src: event source register address 129 * @ev_ths: event threshold register address 130 * @ev_ths_mask: mask for the threshold value 131 * @ev_count: event count (period) register address 132 * 133 * Since not all chips supported by the driver support comparing high pass 134 * filtered data for events (interrupts), different interrupt sources are 135 * used for different chips and the relevant registers are included here. 136 */ 137 struct mma8452_event_regs { 138 u8 ev_cfg; 139 u8 ev_cfg_ele; 140 u8 ev_cfg_chan_shift; 141 u8 ev_src; 142 u8 ev_ths; 143 u8 ev_ths_mask; 144 u8 ev_count; 145 }; 146 147 static const struct mma8452_event_regs ff_mt_ev_regs = { 148 .ev_cfg = MMA8452_FF_MT_CFG, 149 .ev_cfg_ele = MMA8452_FF_MT_CFG_ELE, 150 .ev_cfg_chan_shift = MMA8452_FF_MT_CHAN_SHIFT, 151 .ev_src = MMA8452_FF_MT_SRC, 152 .ev_ths = MMA8452_FF_MT_THS, 153 .ev_ths_mask = MMA8452_FF_MT_THS_MASK, 154 .ev_count = MMA8452_FF_MT_COUNT 155 }; 156 157 static const struct mma8452_event_regs trans_ev_regs = { 158 .ev_cfg = MMA8452_TRANSIENT_CFG, 159 .ev_cfg_ele = MMA8452_TRANSIENT_CFG_ELE, 160 .ev_cfg_chan_shift = MMA8452_TRANSIENT_CHAN_SHIFT, 161 .ev_src = MMA8452_TRANSIENT_SRC, 162 .ev_ths = MMA8452_TRANSIENT_THS, 163 .ev_ths_mask = MMA8452_TRANSIENT_THS_MASK, 164 .ev_count = MMA8452_TRANSIENT_COUNT, 165 }; 166 167 /** 168 * struct mma_chip_info - chip specific data 169 * @name: part number of device reported via 'name' attr 170 * @chip_id: WHO_AM_I register's value 171 * @channels: struct iio_chan_spec matching the device's 172 * capabilities 173 * @num_channels: number of channels 174 * @mma_scales: scale factors for converting register values 175 * to m/s^2; 3 modes: 2g, 4g, 8g; 2 integers 176 * per mode: m/s^2 and micro m/s^2 177 * @all_events: all events supported by this chip 178 * @enabled_events: event flags enabled and handled by this driver 179 */ 180 struct mma_chip_info { 181 const char *name; 182 u8 chip_id; 183 const struct iio_chan_spec *channels; 184 int num_channels; 185 const int mma_scales[3][2]; 186 int all_events; 187 int enabled_events; 188 }; 189 190 enum { 191 idx_x, 192 idx_y, 193 idx_z, 194 idx_ts, 195 }; 196 197 static int mma8452_drdy(struct mma8452_data *data) 198 { 199 int tries = 150; 200 201 while (tries-- > 0) { 202 int ret = i2c_smbus_read_byte_data(data->client, 203 MMA8452_STATUS); 204 if (ret < 0) 205 return ret; 206 if ((ret & MMA8452_STATUS_DRDY) == MMA8452_STATUS_DRDY) 207 return 0; 208 209 if (data->sleep_val <= 20) 210 usleep_range(data->sleep_val * 250, 211 data->sleep_val * 500); 212 else 213 msleep(20); 214 } 215 216 dev_err(&data->client->dev, "data not ready\n"); 217 218 return -EIO; 219 } 220 221 static int mma8452_set_runtime_pm_state(struct i2c_client *client, bool on) 222 { 223 #ifdef CONFIG_PM 224 int ret; 225 226 if (on) { 227 ret = pm_runtime_resume_and_get(&client->dev); 228 } else { 229 pm_runtime_mark_last_busy(&client->dev); 230 ret = pm_runtime_put_autosuspend(&client->dev); 231 } 232 233 if (ret < 0) { 234 dev_err(&client->dev, 235 "failed to change power state to %d\n", on); 236 237 return ret; 238 } 239 #endif 240 241 return 0; 242 } 243 244 static int mma8452_read(struct mma8452_data *data, __be16 buf[3]) 245 { 246 int ret = mma8452_drdy(data); 247 248 if (ret < 0) 249 return ret; 250 251 ret = mma8452_set_runtime_pm_state(data->client, true); 252 if (ret) 253 return ret; 254 255 ret = i2c_smbus_read_i2c_block_data(data->client, MMA8452_OUT_X, 256 3 * sizeof(__be16), (u8 *)buf); 257 258 ret = mma8452_set_runtime_pm_state(data->client, false); 259 260 return ret; 261 } 262 263 static ssize_t mma8452_show_int_plus_micros(char *buf, const int (*vals)[2], 264 int n) 265 { 266 size_t len = 0; 267 268 while (n-- > 0) 269 len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ", 270 vals[n][0], vals[n][1]); 271 272 /* replace trailing space by newline */ 273 buf[len - 1] = '\n'; 274 275 return len; 276 } 277 278 static int mma8452_get_int_plus_micros_index(const int (*vals)[2], int n, 279 int val, int val2) 280 { 281 while (n-- > 0) 282 if (val == vals[n][0] && val2 == vals[n][1]) 283 return n; 284 285 return -EINVAL; 286 } 287 288 static unsigned int mma8452_get_odr_index(struct mma8452_data *data) 289 { 290 return (data->ctrl_reg1 & MMA8452_CTRL_DR_MASK) >> 291 MMA8452_CTRL_DR_SHIFT; 292 } 293 294 static const int mma8452_samp_freq[8][2] = { 295 {800, 0}, {400, 0}, {200, 0}, {100, 0}, {50, 0}, {12, 500000}, 296 {6, 250000}, {1, 560000} 297 }; 298 299 /* Datasheet table: step time "Relationship with the ODR" (sample frequency) */ 300 static const unsigned int mma8452_time_step_us[4][8] = { 301 { 1250, 2500, 5000, 10000, 20000, 20000, 20000, 20000 }, /* normal */ 302 { 1250, 2500, 5000, 10000, 20000, 80000, 80000, 80000 }, /* l p l n */ 303 { 1250, 2500, 2500, 2500, 2500, 2500, 2500, 2500 }, /* high res*/ 304 { 1250, 2500, 5000, 10000, 20000, 80000, 160000, 160000 } /* l p */ 305 }; 306 307 /* Datasheet table "High-Pass Filter Cutoff Options" */ 308 static const int mma8452_hp_filter_cutoff[4][8][4][2] = { 309 { /* normal */ 310 { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, /* 800 Hz sample */ 311 { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, /* 400 Hz sample */ 312 { {8, 0}, {4, 0}, {2, 0}, {1, 0} }, /* 200 Hz sample */ 313 { {4, 0}, {2, 0}, {1, 0}, {0, 500000} }, /* 100 Hz sample */ 314 { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} }, /* 50 Hz sample */ 315 { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} }, /* 12.5 Hz sample */ 316 { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} }, /* 6.25 Hz sample */ 317 { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} } /* 1.56 Hz sample */ 318 }, 319 { /* low noise low power */ 320 { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, 321 { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, 322 { {8, 0}, {4, 0}, {2, 0}, {1, 0} }, 323 { {4, 0}, {2, 0}, {1, 0}, {0, 500000} }, 324 { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} }, 325 { {0, 500000}, {0, 250000}, {0, 125000}, {0, 063000} }, 326 { {0, 500000}, {0, 250000}, {0, 125000}, {0, 063000} }, 327 { {0, 500000}, {0, 250000}, {0, 125000}, {0, 063000} } 328 }, 329 { /* high resolution */ 330 { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, 331 { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, 332 { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, 333 { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, 334 { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, 335 { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, 336 { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, 337 { {16, 0}, {8, 0}, {4, 0}, {2, 0} } 338 }, 339 { /* low power */ 340 { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, 341 { {8, 0}, {4, 0}, {2, 0}, {1, 0} }, 342 { {4, 0}, {2, 0}, {1, 0}, {0, 500000} }, 343 { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} }, 344 { {1, 0}, {0, 500000}, {0, 250000}, {0, 125000} }, 345 { {0, 250000}, {0, 125000}, {0, 063000}, {0, 031000} }, 346 { {0, 250000}, {0, 125000}, {0, 063000}, {0, 031000} }, 347 { {0, 250000}, {0, 125000}, {0, 063000}, {0, 031000} } 348 } 349 }; 350 351 /* Datasheet table "MODS Oversampling modes averaging values at each ODR" */ 352 static const u16 mma8452_os_ratio[4][8] = { 353 /* 800 Hz, 400 Hz, ... , 1.56 Hz */ 354 { 2, 4, 4, 4, 4, 16, 32, 128 }, /* normal */ 355 { 2, 4, 4, 4, 4, 4, 8, 32 }, /* low power low noise */ 356 { 2, 4, 8, 16, 32, 128, 256, 1024 }, /* high resolution */ 357 { 2, 2, 2, 2, 2, 2, 4, 16 } /* low power */ 358 }; 359 360 static int mma8452_get_power_mode(struct mma8452_data *data) 361 { 362 int reg; 363 364 reg = i2c_smbus_read_byte_data(data->client, 365 MMA8452_CTRL_REG2); 366 if (reg < 0) 367 return reg; 368 369 return ((reg & MMA8452_CTRL_REG2_MODS_MASK) >> 370 MMA8452_CTRL_REG2_MODS_SHIFT); 371 } 372 373 static ssize_t mma8452_show_samp_freq_avail(struct device *dev, 374 struct device_attribute *attr, 375 char *buf) 376 { 377 return mma8452_show_int_plus_micros(buf, mma8452_samp_freq, 378 ARRAY_SIZE(mma8452_samp_freq)); 379 } 380 381 static ssize_t mma8452_show_scale_avail(struct device *dev, 382 struct device_attribute *attr, 383 char *buf) 384 { 385 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 386 struct mma8452_data *data = iio_priv(indio_dev); 387 388 return mma8452_show_int_plus_micros(buf, data->chip_info->mma_scales, 389 ARRAY_SIZE(data->chip_info->mma_scales)); 390 } 391 392 static ssize_t mma8452_show_hp_cutoff_avail(struct device *dev, 393 struct device_attribute *attr, 394 char *buf) 395 { 396 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 397 struct mma8452_data *data = iio_priv(indio_dev); 398 int i, j; 399 400 i = mma8452_get_odr_index(data); 401 j = mma8452_get_power_mode(data); 402 if (j < 0) 403 return j; 404 405 return mma8452_show_int_plus_micros(buf, mma8452_hp_filter_cutoff[j][i], 406 ARRAY_SIZE(mma8452_hp_filter_cutoff[0][0])); 407 } 408 409 static ssize_t mma8452_show_os_ratio_avail(struct device *dev, 410 struct device_attribute *attr, 411 char *buf) 412 { 413 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 414 struct mma8452_data *data = iio_priv(indio_dev); 415 int i = mma8452_get_odr_index(data); 416 int j; 417 u16 val = 0; 418 size_t len = 0; 419 420 for (j = 0; j < ARRAY_SIZE(mma8452_os_ratio); j++) { 421 if (val == mma8452_os_ratio[j][i]) 422 continue; 423 424 val = mma8452_os_ratio[j][i]; 425 426 len += scnprintf(buf + len, PAGE_SIZE - len, "%d ", val); 427 } 428 buf[len - 1] = '\n'; 429 430 return len; 431 } 432 433 static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(mma8452_show_samp_freq_avail); 434 static IIO_DEVICE_ATTR(in_accel_scale_available, 0444, 435 mma8452_show_scale_avail, NULL, 0); 436 static IIO_DEVICE_ATTR(in_accel_filter_high_pass_3db_frequency_available, 437 0444, mma8452_show_hp_cutoff_avail, NULL, 0); 438 static IIO_DEVICE_ATTR(in_accel_oversampling_ratio_available, 0444, 439 mma8452_show_os_ratio_avail, NULL, 0); 440 441 static int mma8452_get_samp_freq_index(struct mma8452_data *data, 442 int val, int val2) 443 { 444 return mma8452_get_int_plus_micros_index(mma8452_samp_freq, 445 ARRAY_SIZE(mma8452_samp_freq), 446 val, val2); 447 } 448 449 static int mma8452_get_scale_index(struct mma8452_data *data, int val, int val2) 450 { 451 return mma8452_get_int_plus_micros_index(data->chip_info->mma_scales, 452 ARRAY_SIZE(data->chip_info->mma_scales), val, val2); 453 } 454 455 static int mma8452_get_hp_filter_index(struct mma8452_data *data, 456 int val, int val2) 457 { 458 int i, j; 459 460 i = mma8452_get_odr_index(data); 461 j = mma8452_get_power_mode(data); 462 if (j < 0) 463 return j; 464 465 return mma8452_get_int_plus_micros_index(mma8452_hp_filter_cutoff[j][i], 466 ARRAY_SIZE(mma8452_hp_filter_cutoff[0][0]), val, val2); 467 } 468 469 static int mma8452_read_hp_filter(struct mma8452_data *data, int *hz, int *uHz) 470 { 471 int j, i, ret; 472 473 ret = i2c_smbus_read_byte_data(data->client, MMA8452_HP_FILTER_CUTOFF); 474 if (ret < 0) 475 return ret; 476 477 i = mma8452_get_odr_index(data); 478 j = mma8452_get_power_mode(data); 479 if (j < 0) 480 return j; 481 482 ret &= MMA8452_HP_FILTER_CUTOFF_SEL_MASK; 483 *hz = mma8452_hp_filter_cutoff[j][i][ret][0]; 484 *uHz = mma8452_hp_filter_cutoff[j][i][ret][1]; 485 486 return 0; 487 } 488 489 static int mma8452_read_raw(struct iio_dev *indio_dev, 490 struct iio_chan_spec const *chan, 491 int *val, int *val2, long mask) 492 { 493 struct mma8452_data *data = iio_priv(indio_dev); 494 __be16 buffer[3]; 495 int i, ret; 496 497 switch (mask) { 498 case IIO_CHAN_INFO_RAW: 499 ret = iio_device_claim_direct_mode(indio_dev); 500 if (ret) 501 return ret; 502 503 mutex_lock(&data->lock); 504 ret = mma8452_read(data, buffer); 505 mutex_unlock(&data->lock); 506 iio_device_release_direct_mode(indio_dev); 507 if (ret < 0) 508 return ret; 509 510 *val = sign_extend32(be16_to_cpu( 511 buffer[chan->scan_index]) >> chan->scan_type.shift, 512 chan->scan_type.realbits - 1); 513 514 return IIO_VAL_INT; 515 case IIO_CHAN_INFO_SCALE: 516 i = data->data_cfg & MMA8452_DATA_CFG_FS_MASK; 517 *val = data->chip_info->mma_scales[i][0]; 518 *val2 = data->chip_info->mma_scales[i][1]; 519 520 return IIO_VAL_INT_PLUS_MICRO; 521 case IIO_CHAN_INFO_SAMP_FREQ: 522 i = mma8452_get_odr_index(data); 523 *val = mma8452_samp_freq[i][0]; 524 *val2 = mma8452_samp_freq[i][1]; 525 526 return IIO_VAL_INT_PLUS_MICRO; 527 case IIO_CHAN_INFO_CALIBBIAS: 528 ret = i2c_smbus_read_byte_data(data->client, 529 MMA8452_OFF_X + 530 chan->scan_index); 531 if (ret < 0) 532 return ret; 533 534 *val = sign_extend32(ret, 7); 535 536 return IIO_VAL_INT; 537 case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY: 538 if (data->data_cfg & MMA8452_DATA_CFG_HPF_MASK) { 539 ret = mma8452_read_hp_filter(data, val, val2); 540 if (ret < 0) 541 return ret; 542 } else { 543 *val = 0; 544 *val2 = 0; 545 } 546 547 return IIO_VAL_INT_PLUS_MICRO; 548 case IIO_CHAN_INFO_OVERSAMPLING_RATIO: 549 ret = mma8452_get_power_mode(data); 550 if (ret < 0) 551 return ret; 552 553 i = mma8452_get_odr_index(data); 554 555 *val = mma8452_os_ratio[ret][i]; 556 return IIO_VAL_INT; 557 } 558 559 return -EINVAL; 560 } 561 562 static int mma8452_calculate_sleep(struct mma8452_data *data) 563 { 564 int ret, i = mma8452_get_odr_index(data); 565 566 if (mma8452_samp_freq[i][0] > 0) 567 ret = 1000 / mma8452_samp_freq[i][0]; 568 else 569 ret = 1000; 570 571 return ret == 0 ? 1 : ret; 572 } 573 574 static int mma8452_standby(struct mma8452_data *data) 575 { 576 return i2c_smbus_write_byte_data(data->client, MMA8452_CTRL_REG1, 577 data->ctrl_reg1 & ~MMA8452_CTRL_ACTIVE); 578 } 579 580 static int mma8452_active(struct mma8452_data *data) 581 { 582 return i2c_smbus_write_byte_data(data->client, MMA8452_CTRL_REG1, 583 data->ctrl_reg1); 584 } 585 586 /* returns >0 if active, 0 if in standby and <0 on error */ 587 static int mma8452_is_active(struct mma8452_data *data) 588 { 589 int reg; 590 591 reg = i2c_smbus_read_byte_data(data->client, MMA8452_CTRL_REG1); 592 if (reg < 0) 593 return reg; 594 595 return reg & MMA8452_CTRL_ACTIVE; 596 } 597 598 static int mma8452_change_config(struct mma8452_data *data, u8 reg, u8 val) 599 { 600 int ret; 601 int is_active; 602 603 mutex_lock(&data->lock); 604 605 is_active = mma8452_is_active(data); 606 if (is_active < 0) { 607 ret = is_active; 608 goto fail; 609 } 610 611 /* config can only be changed when in standby */ 612 if (is_active > 0) { 613 ret = mma8452_standby(data); 614 if (ret < 0) 615 goto fail; 616 } 617 618 ret = i2c_smbus_write_byte_data(data->client, reg, val); 619 if (ret < 0) 620 goto fail; 621 622 if (is_active > 0) { 623 ret = mma8452_active(data); 624 if (ret < 0) 625 goto fail; 626 } 627 628 ret = 0; 629 fail: 630 mutex_unlock(&data->lock); 631 632 return ret; 633 } 634 635 static int mma8452_set_power_mode(struct mma8452_data *data, u8 mode) 636 { 637 int reg; 638 639 reg = i2c_smbus_read_byte_data(data->client, 640 MMA8452_CTRL_REG2); 641 if (reg < 0) 642 return reg; 643 644 reg &= ~MMA8452_CTRL_REG2_MODS_MASK; 645 reg |= mode << MMA8452_CTRL_REG2_MODS_SHIFT; 646 647 return mma8452_change_config(data, MMA8452_CTRL_REG2, reg); 648 } 649 650 /* returns >0 if in freefall mode, 0 if not or <0 if an error occurred */ 651 static int mma8452_freefall_mode_enabled(struct mma8452_data *data) 652 { 653 int val; 654 655 val = i2c_smbus_read_byte_data(data->client, MMA8452_FF_MT_CFG); 656 if (val < 0) 657 return val; 658 659 return !(val & MMA8452_FF_MT_CFG_OAE); 660 } 661 662 static int mma8452_set_freefall_mode(struct mma8452_data *data, bool state) 663 { 664 int val; 665 666 if ((state && mma8452_freefall_mode_enabled(data)) || 667 (!state && !(mma8452_freefall_mode_enabled(data)))) 668 return 0; 669 670 val = i2c_smbus_read_byte_data(data->client, MMA8452_FF_MT_CFG); 671 if (val < 0) 672 return val; 673 674 if (state) { 675 val |= BIT(idx_x + MMA8452_FF_MT_CHAN_SHIFT); 676 val |= BIT(idx_y + MMA8452_FF_MT_CHAN_SHIFT); 677 val |= BIT(idx_z + MMA8452_FF_MT_CHAN_SHIFT); 678 val &= ~MMA8452_FF_MT_CFG_OAE; 679 } else { 680 val &= ~BIT(idx_x + MMA8452_FF_MT_CHAN_SHIFT); 681 val &= ~BIT(idx_y + MMA8452_FF_MT_CHAN_SHIFT); 682 val &= ~BIT(idx_z + MMA8452_FF_MT_CHAN_SHIFT); 683 val |= MMA8452_FF_MT_CFG_OAE; 684 } 685 686 return mma8452_change_config(data, MMA8452_FF_MT_CFG, val); 687 } 688 689 static int mma8452_set_hp_filter_frequency(struct mma8452_data *data, 690 int val, int val2) 691 { 692 int i, reg; 693 694 i = mma8452_get_hp_filter_index(data, val, val2); 695 if (i < 0) 696 return i; 697 698 reg = i2c_smbus_read_byte_data(data->client, 699 MMA8452_HP_FILTER_CUTOFF); 700 if (reg < 0) 701 return reg; 702 703 reg &= ~MMA8452_HP_FILTER_CUTOFF_SEL_MASK; 704 reg |= i; 705 706 return mma8452_change_config(data, MMA8452_HP_FILTER_CUTOFF, reg); 707 } 708 709 static int mma8452_write_raw(struct iio_dev *indio_dev, 710 struct iio_chan_spec const *chan, 711 int val, int val2, long mask) 712 { 713 struct mma8452_data *data = iio_priv(indio_dev); 714 int i, ret; 715 716 ret = iio_device_claim_direct_mode(indio_dev); 717 if (ret) 718 return ret; 719 720 switch (mask) { 721 case IIO_CHAN_INFO_SAMP_FREQ: 722 i = mma8452_get_samp_freq_index(data, val, val2); 723 if (i < 0) { 724 ret = i; 725 break; 726 } 727 data->ctrl_reg1 &= ~MMA8452_CTRL_DR_MASK; 728 data->ctrl_reg1 |= i << MMA8452_CTRL_DR_SHIFT; 729 730 data->sleep_val = mma8452_calculate_sleep(data); 731 732 ret = mma8452_change_config(data, MMA8452_CTRL_REG1, 733 data->ctrl_reg1); 734 break; 735 case IIO_CHAN_INFO_SCALE: 736 i = mma8452_get_scale_index(data, val, val2); 737 if (i < 0) { 738 ret = i; 739 break; 740 } 741 742 data->data_cfg &= ~MMA8452_DATA_CFG_FS_MASK; 743 data->data_cfg |= i; 744 745 ret = mma8452_change_config(data, MMA8452_DATA_CFG, 746 data->data_cfg); 747 break; 748 case IIO_CHAN_INFO_CALIBBIAS: 749 if (val < -128 || val > 127) { 750 ret = -EINVAL; 751 break; 752 } 753 754 ret = mma8452_change_config(data, 755 MMA8452_OFF_X + chan->scan_index, 756 val); 757 break; 758 759 case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY: 760 if (val == 0 && val2 == 0) { 761 data->data_cfg &= ~MMA8452_DATA_CFG_HPF_MASK; 762 } else { 763 data->data_cfg |= MMA8452_DATA_CFG_HPF_MASK; 764 ret = mma8452_set_hp_filter_frequency(data, val, val2); 765 if (ret < 0) 766 break; 767 } 768 769 ret = mma8452_change_config(data, MMA8452_DATA_CFG, 770 data->data_cfg); 771 break; 772 773 case IIO_CHAN_INFO_OVERSAMPLING_RATIO: 774 ret = mma8452_get_odr_index(data); 775 776 for (i = 0; i < ARRAY_SIZE(mma8452_os_ratio); i++) { 777 if (mma8452_os_ratio[i][ret] == val) { 778 ret = mma8452_set_power_mode(data, i); 779 break; 780 } 781 } 782 break; 783 default: 784 ret = -EINVAL; 785 break; 786 } 787 788 iio_device_release_direct_mode(indio_dev); 789 return ret; 790 } 791 792 static int mma8452_get_event_regs(struct mma8452_data *data, 793 const struct iio_chan_spec *chan, enum iio_event_direction dir, 794 const struct mma8452_event_regs **ev_reg) 795 { 796 if (!chan) 797 return -EINVAL; 798 799 switch (chan->type) { 800 case IIO_ACCEL: 801 switch (dir) { 802 case IIO_EV_DIR_RISING: 803 if ((data->chip_info->all_events 804 & MMA8452_INT_TRANS) && 805 (data->chip_info->enabled_events 806 & MMA8452_INT_TRANS)) 807 *ev_reg = &trans_ev_regs; 808 else 809 *ev_reg = &ff_mt_ev_regs; 810 return 0; 811 case IIO_EV_DIR_FALLING: 812 *ev_reg = &ff_mt_ev_regs; 813 return 0; 814 default: 815 return -EINVAL; 816 } 817 default: 818 return -EINVAL; 819 } 820 } 821 822 static int mma8452_read_event_value(struct iio_dev *indio_dev, 823 const struct iio_chan_spec *chan, 824 enum iio_event_type type, 825 enum iio_event_direction dir, 826 enum iio_event_info info, 827 int *val, int *val2) 828 { 829 struct mma8452_data *data = iio_priv(indio_dev); 830 int ret, us, power_mode; 831 const struct mma8452_event_regs *ev_regs; 832 833 ret = mma8452_get_event_regs(data, chan, dir, &ev_regs); 834 if (ret) 835 return ret; 836 837 switch (info) { 838 case IIO_EV_INFO_VALUE: 839 ret = i2c_smbus_read_byte_data(data->client, ev_regs->ev_ths); 840 if (ret < 0) 841 return ret; 842 843 *val = ret & ev_regs->ev_ths_mask; 844 845 return IIO_VAL_INT; 846 847 case IIO_EV_INFO_PERIOD: 848 ret = i2c_smbus_read_byte_data(data->client, ev_regs->ev_count); 849 if (ret < 0) 850 return ret; 851 852 power_mode = mma8452_get_power_mode(data); 853 if (power_mode < 0) 854 return power_mode; 855 856 us = ret * mma8452_time_step_us[power_mode][ 857 mma8452_get_odr_index(data)]; 858 *val = us / USEC_PER_SEC; 859 *val2 = us % USEC_PER_SEC; 860 861 return IIO_VAL_INT_PLUS_MICRO; 862 863 case IIO_EV_INFO_HIGH_PASS_FILTER_3DB: 864 ret = i2c_smbus_read_byte_data(data->client, 865 MMA8452_TRANSIENT_CFG); 866 if (ret < 0) 867 return ret; 868 869 if (ret & MMA8452_TRANSIENT_CFG_HPF_BYP) { 870 *val = 0; 871 *val2 = 0; 872 } else { 873 ret = mma8452_read_hp_filter(data, val, val2); 874 if (ret < 0) 875 return ret; 876 } 877 878 return IIO_VAL_INT_PLUS_MICRO; 879 880 default: 881 return -EINVAL; 882 } 883 } 884 885 static int mma8452_write_event_value(struct iio_dev *indio_dev, 886 const struct iio_chan_spec *chan, 887 enum iio_event_type type, 888 enum iio_event_direction dir, 889 enum iio_event_info info, 890 int val, int val2) 891 { 892 struct mma8452_data *data = iio_priv(indio_dev); 893 int ret, reg, steps; 894 const struct mma8452_event_regs *ev_regs; 895 896 ret = mma8452_get_event_regs(data, chan, dir, &ev_regs); 897 if (ret) 898 return ret; 899 900 switch (info) { 901 case IIO_EV_INFO_VALUE: 902 if (val < 0 || val > ev_regs->ev_ths_mask) 903 return -EINVAL; 904 905 return mma8452_change_config(data, ev_regs->ev_ths, val); 906 907 case IIO_EV_INFO_PERIOD: 908 ret = mma8452_get_power_mode(data); 909 if (ret < 0) 910 return ret; 911 912 steps = (val * USEC_PER_SEC + val2) / 913 mma8452_time_step_us[ret][ 914 mma8452_get_odr_index(data)]; 915 916 if (steps < 0 || steps > 0xff) 917 return -EINVAL; 918 919 return mma8452_change_config(data, ev_regs->ev_count, steps); 920 921 case IIO_EV_INFO_HIGH_PASS_FILTER_3DB: 922 reg = i2c_smbus_read_byte_data(data->client, 923 MMA8452_TRANSIENT_CFG); 924 if (reg < 0) 925 return reg; 926 927 if (val == 0 && val2 == 0) { 928 reg |= MMA8452_TRANSIENT_CFG_HPF_BYP; 929 } else { 930 reg &= ~MMA8452_TRANSIENT_CFG_HPF_BYP; 931 ret = mma8452_set_hp_filter_frequency(data, val, val2); 932 if (ret < 0) 933 return ret; 934 } 935 936 return mma8452_change_config(data, MMA8452_TRANSIENT_CFG, reg); 937 938 default: 939 return -EINVAL; 940 } 941 } 942 943 static int mma8452_read_event_config(struct iio_dev *indio_dev, 944 const struct iio_chan_spec *chan, 945 enum iio_event_type type, 946 enum iio_event_direction dir) 947 { 948 struct mma8452_data *data = iio_priv(indio_dev); 949 int ret; 950 const struct mma8452_event_regs *ev_regs; 951 952 ret = mma8452_get_event_regs(data, chan, dir, &ev_regs); 953 if (ret) 954 return ret; 955 956 switch (dir) { 957 case IIO_EV_DIR_FALLING: 958 return mma8452_freefall_mode_enabled(data); 959 case IIO_EV_DIR_RISING: 960 ret = i2c_smbus_read_byte_data(data->client, 961 ev_regs->ev_cfg); 962 if (ret < 0) 963 return ret; 964 965 return !!(ret & BIT(chan->scan_index + 966 ev_regs->ev_cfg_chan_shift)); 967 default: 968 return -EINVAL; 969 } 970 } 971 972 static int mma8452_write_event_config(struct iio_dev *indio_dev, 973 const struct iio_chan_spec *chan, 974 enum iio_event_type type, 975 enum iio_event_direction dir, 976 int state) 977 { 978 struct mma8452_data *data = iio_priv(indio_dev); 979 int val, ret; 980 const struct mma8452_event_regs *ev_regs; 981 982 ret = mma8452_get_event_regs(data, chan, dir, &ev_regs); 983 if (ret) 984 return ret; 985 986 ret = mma8452_set_runtime_pm_state(data->client, state); 987 if (ret) 988 return ret; 989 990 switch (dir) { 991 case IIO_EV_DIR_FALLING: 992 return mma8452_set_freefall_mode(data, state); 993 case IIO_EV_DIR_RISING: 994 val = i2c_smbus_read_byte_data(data->client, ev_regs->ev_cfg); 995 if (val < 0) 996 return val; 997 998 if (state) { 999 if (mma8452_freefall_mode_enabled(data)) { 1000 val &= ~BIT(idx_x + ev_regs->ev_cfg_chan_shift); 1001 val &= ~BIT(idx_y + ev_regs->ev_cfg_chan_shift); 1002 val &= ~BIT(idx_z + ev_regs->ev_cfg_chan_shift); 1003 val |= MMA8452_FF_MT_CFG_OAE; 1004 } 1005 val |= BIT(chan->scan_index + 1006 ev_regs->ev_cfg_chan_shift); 1007 } else { 1008 if (mma8452_freefall_mode_enabled(data)) 1009 return 0; 1010 1011 val &= ~BIT(chan->scan_index + 1012 ev_regs->ev_cfg_chan_shift); 1013 } 1014 1015 val |= ev_regs->ev_cfg_ele; 1016 1017 return mma8452_change_config(data, ev_regs->ev_cfg, val); 1018 default: 1019 return -EINVAL; 1020 } 1021 } 1022 1023 static void mma8452_transient_interrupt(struct iio_dev *indio_dev) 1024 { 1025 struct mma8452_data *data = iio_priv(indio_dev); 1026 s64 ts = iio_get_time_ns(indio_dev); 1027 int src; 1028 1029 src = i2c_smbus_read_byte_data(data->client, MMA8452_TRANSIENT_SRC); 1030 if (src < 0) 1031 return; 1032 1033 if (src & MMA8452_TRANSIENT_SRC_XTRANSE) 1034 iio_push_event(indio_dev, 1035 IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_X, 1036 IIO_EV_TYPE_MAG, 1037 IIO_EV_DIR_RISING), 1038 ts); 1039 1040 if (src & MMA8452_TRANSIENT_SRC_YTRANSE) 1041 iio_push_event(indio_dev, 1042 IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_Y, 1043 IIO_EV_TYPE_MAG, 1044 IIO_EV_DIR_RISING), 1045 ts); 1046 1047 if (src & MMA8452_TRANSIENT_SRC_ZTRANSE) 1048 iio_push_event(indio_dev, 1049 IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_Z, 1050 IIO_EV_TYPE_MAG, 1051 IIO_EV_DIR_RISING), 1052 ts); 1053 } 1054 1055 static irqreturn_t mma8452_interrupt(int irq, void *p) 1056 { 1057 struct iio_dev *indio_dev = p; 1058 struct mma8452_data *data = iio_priv(indio_dev); 1059 irqreturn_t ret = IRQ_NONE; 1060 int src; 1061 1062 src = i2c_smbus_read_byte_data(data->client, MMA8452_INT_SRC); 1063 if (src < 0) 1064 return IRQ_NONE; 1065 1066 if (!(src & (data->chip_info->enabled_events | MMA8452_INT_DRDY))) 1067 return IRQ_NONE; 1068 1069 if (src & MMA8452_INT_DRDY) { 1070 iio_trigger_poll_chained(indio_dev->trig); 1071 ret = IRQ_HANDLED; 1072 } 1073 1074 if (src & MMA8452_INT_FF_MT) { 1075 if (mma8452_freefall_mode_enabled(data)) { 1076 s64 ts = iio_get_time_ns(indio_dev); 1077 1078 iio_push_event(indio_dev, 1079 IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, 1080 IIO_MOD_X_AND_Y_AND_Z, 1081 IIO_EV_TYPE_MAG, 1082 IIO_EV_DIR_FALLING), 1083 ts); 1084 } 1085 ret = IRQ_HANDLED; 1086 } 1087 1088 if (src & MMA8452_INT_TRANS) { 1089 mma8452_transient_interrupt(indio_dev); 1090 ret = IRQ_HANDLED; 1091 } 1092 1093 return ret; 1094 } 1095 1096 static irqreturn_t mma8452_trigger_handler(int irq, void *p) 1097 { 1098 struct iio_poll_func *pf = p; 1099 struct iio_dev *indio_dev = pf->indio_dev; 1100 struct mma8452_data *data = iio_priv(indio_dev); 1101 int ret; 1102 1103 ret = mma8452_read(data, data->buffer.channels); 1104 if (ret < 0) 1105 goto done; 1106 1107 iio_push_to_buffers_with_timestamp(indio_dev, &data->buffer, 1108 iio_get_time_ns(indio_dev)); 1109 1110 done: 1111 iio_trigger_notify_done(indio_dev->trig); 1112 1113 return IRQ_HANDLED; 1114 } 1115 1116 static int mma8452_reg_access_dbg(struct iio_dev *indio_dev, 1117 unsigned int reg, unsigned int writeval, 1118 unsigned int *readval) 1119 { 1120 int ret; 1121 struct mma8452_data *data = iio_priv(indio_dev); 1122 1123 if (reg > MMA8452_MAX_REG) 1124 return -EINVAL; 1125 1126 if (!readval) 1127 return mma8452_change_config(data, reg, writeval); 1128 1129 ret = i2c_smbus_read_byte_data(data->client, reg); 1130 if (ret < 0) 1131 return ret; 1132 1133 *readval = ret; 1134 1135 return 0; 1136 } 1137 1138 static const struct iio_event_spec mma8452_freefall_event[] = { 1139 { 1140 .type = IIO_EV_TYPE_MAG, 1141 .dir = IIO_EV_DIR_FALLING, 1142 .mask_separate = BIT(IIO_EV_INFO_ENABLE), 1143 .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) | 1144 BIT(IIO_EV_INFO_PERIOD) | 1145 BIT(IIO_EV_INFO_HIGH_PASS_FILTER_3DB) 1146 }, 1147 }; 1148 1149 static const struct iio_event_spec mma8652_freefall_event[] = { 1150 { 1151 .type = IIO_EV_TYPE_MAG, 1152 .dir = IIO_EV_DIR_FALLING, 1153 .mask_separate = BIT(IIO_EV_INFO_ENABLE), 1154 .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) | 1155 BIT(IIO_EV_INFO_PERIOD) 1156 }, 1157 }; 1158 1159 static const struct iio_event_spec mma8452_transient_event[] = { 1160 { 1161 .type = IIO_EV_TYPE_MAG, 1162 .dir = IIO_EV_DIR_RISING, 1163 .mask_separate = BIT(IIO_EV_INFO_ENABLE), 1164 .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) | 1165 BIT(IIO_EV_INFO_PERIOD) | 1166 BIT(IIO_EV_INFO_HIGH_PASS_FILTER_3DB) 1167 }, 1168 }; 1169 1170 static const struct iio_event_spec mma8452_motion_event[] = { 1171 { 1172 .type = IIO_EV_TYPE_MAG, 1173 .dir = IIO_EV_DIR_RISING, 1174 .mask_separate = BIT(IIO_EV_INFO_ENABLE), 1175 .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) | 1176 BIT(IIO_EV_INFO_PERIOD) 1177 }, 1178 }; 1179 1180 /* 1181 * Threshold is configured in fixed 8G/127 steps regardless of 1182 * currently selected scale for measurement. 1183 */ 1184 static IIO_CONST_ATTR_NAMED(accel_transient_scale, in_accel_scale, "0.617742"); 1185 1186 static struct attribute *mma8452_event_attributes[] = { 1187 &iio_const_attr_accel_transient_scale.dev_attr.attr, 1188 NULL, 1189 }; 1190 1191 static const struct attribute_group mma8452_event_attribute_group = { 1192 .attrs = mma8452_event_attributes, 1193 }; 1194 1195 static const struct iio_mount_matrix * 1196 mma8452_get_mount_matrix(const struct iio_dev *indio_dev, 1197 const struct iio_chan_spec *chan) 1198 { 1199 struct mma8452_data *data = iio_priv(indio_dev); 1200 1201 return &data->orientation; 1202 } 1203 1204 static const struct iio_chan_spec_ext_info mma8452_ext_info[] = { 1205 IIO_MOUNT_MATRIX(IIO_SHARED_BY_TYPE, mma8452_get_mount_matrix), 1206 { } 1207 }; 1208 1209 #define MMA8452_FREEFALL_CHANNEL(modifier) { \ 1210 .type = IIO_ACCEL, \ 1211 .modified = 1, \ 1212 .channel2 = modifier, \ 1213 .scan_index = -1, \ 1214 .event_spec = mma8452_freefall_event, \ 1215 .num_event_specs = ARRAY_SIZE(mma8452_freefall_event), \ 1216 } 1217 1218 #define MMA8652_FREEFALL_CHANNEL(modifier) { \ 1219 .type = IIO_ACCEL, \ 1220 .modified = 1, \ 1221 .channel2 = modifier, \ 1222 .scan_index = -1, \ 1223 .event_spec = mma8652_freefall_event, \ 1224 .num_event_specs = ARRAY_SIZE(mma8652_freefall_event), \ 1225 } 1226 1227 #define MMA8452_CHANNEL(axis, idx, bits) { \ 1228 .type = IIO_ACCEL, \ 1229 .modified = 1, \ 1230 .channel2 = IIO_MOD_##axis, \ 1231 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ 1232 BIT(IIO_CHAN_INFO_CALIBBIAS), \ 1233 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ 1234 BIT(IIO_CHAN_INFO_SCALE) | \ 1235 BIT(IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY) | \ 1236 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \ 1237 .scan_index = idx, \ 1238 .scan_type = { \ 1239 .sign = 's', \ 1240 .realbits = (bits), \ 1241 .storagebits = 16, \ 1242 .shift = 16 - (bits), \ 1243 .endianness = IIO_BE, \ 1244 }, \ 1245 .event_spec = mma8452_transient_event, \ 1246 .num_event_specs = ARRAY_SIZE(mma8452_transient_event), \ 1247 .ext_info = mma8452_ext_info, \ 1248 } 1249 1250 #define MMA8652_CHANNEL(axis, idx, bits) { \ 1251 .type = IIO_ACCEL, \ 1252 .modified = 1, \ 1253 .channel2 = IIO_MOD_##axis, \ 1254 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ 1255 BIT(IIO_CHAN_INFO_CALIBBIAS), \ 1256 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ 1257 BIT(IIO_CHAN_INFO_SCALE) | \ 1258 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \ 1259 .scan_index = idx, \ 1260 .scan_type = { \ 1261 .sign = 's', \ 1262 .realbits = (bits), \ 1263 .storagebits = 16, \ 1264 .shift = 16 - (bits), \ 1265 .endianness = IIO_BE, \ 1266 }, \ 1267 .event_spec = mma8452_motion_event, \ 1268 .num_event_specs = ARRAY_SIZE(mma8452_motion_event), \ 1269 .ext_info = mma8452_ext_info, \ 1270 } 1271 1272 static const struct iio_chan_spec mma8451_channels[] = { 1273 MMA8452_CHANNEL(X, idx_x, 14), 1274 MMA8452_CHANNEL(Y, idx_y, 14), 1275 MMA8452_CHANNEL(Z, idx_z, 14), 1276 IIO_CHAN_SOFT_TIMESTAMP(idx_ts), 1277 MMA8452_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z), 1278 }; 1279 1280 static const struct iio_chan_spec mma8452_channels[] = { 1281 MMA8452_CHANNEL(X, idx_x, 12), 1282 MMA8452_CHANNEL(Y, idx_y, 12), 1283 MMA8452_CHANNEL(Z, idx_z, 12), 1284 IIO_CHAN_SOFT_TIMESTAMP(idx_ts), 1285 MMA8452_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z), 1286 }; 1287 1288 static const struct iio_chan_spec mma8453_channels[] = { 1289 MMA8452_CHANNEL(X, idx_x, 10), 1290 MMA8452_CHANNEL(Y, idx_y, 10), 1291 MMA8452_CHANNEL(Z, idx_z, 10), 1292 IIO_CHAN_SOFT_TIMESTAMP(idx_ts), 1293 MMA8452_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z), 1294 }; 1295 1296 static const struct iio_chan_spec mma8652_channels[] = { 1297 MMA8652_CHANNEL(X, idx_x, 12), 1298 MMA8652_CHANNEL(Y, idx_y, 12), 1299 MMA8652_CHANNEL(Z, idx_z, 12), 1300 IIO_CHAN_SOFT_TIMESTAMP(idx_ts), 1301 MMA8652_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z), 1302 }; 1303 1304 static const struct iio_chan_spec mma8653_channels[] = { 1305 MMA8652_CHANNEL(X, idx_x, 10), 1306 MMA8652_CHANNEL(Y, idx_y, 10), 1307 MMA8652_CHANNEL(Z, idx_z, 10), 1308 IIO_CHAN_SOFT_TIMESTAMP(idx_ts), 1309 MMA8652_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z), 1310 }; 1311 1312 enum { 1313 mma8451, 1314 mma8452, 1315 mma8453, 1316 mma8652, 1317 mma8653, 1318 fxls8471, 1319 }; 1320 1321 static const struct mma_chip_info mma_chip_info_table[] = { 1322 [mma8451] = { 1323 .name = "mma8451", 1324 .chip_id = MMA8451_DEVICE_ID, 1325 .channels = mma8451_channels, 1326 .num_channels = ARRAY_SIZE(mma8451_channels), 1327 /* 1328 * Hardware has fullscale of -2G, -4G, -8G corresponding to 1329 * raw value -8192 for 14 bit, -2048 for 12 bit or -512 for 10 1330 * bit. 1331 * The userspace interface uses m/s^2 and we declare micro units 1332 * So scale factor for 12 bit here is given by: 1333 * g * N * 1000000 / 2048 for N = 2, 4, 8 and g=9.80665 1334 */ 1335 .mma_scales = { {0, 2394}, {0, 4788}, {0, 9577} }, 1336 /* 1337 * Although we enable the interrupt sources once and for 1338 * all here the event detection itself is not enabled until 1339 * userspace asks for it by mma8452_write_event_config() 1340 */ 1341 .all_events = MMA8452_INT_DRDY | 1342 MMA8452_INT_TRANS | 1343 MMA8452_INT_FF_MT, 1344 .enabled_events = MMA8452_INT_TRANS | 1345 MMA8452_INT_FF_MT, 1346 }, 1347 [mma8452] = { 1348 .name = "mma8452", 1349 .chip_id = MMA8452_DEVICE_ID, 1350 .channels = mma8452_channels, 1351 .num_channels = ARRAY_SIZE(mma8452_channels), 1352 .mma_scales = { {0, 9577}, {0, 19154}, {0, 38307} }, 1353 /* 1354 * Although we enable the interrupt sources once and for 1355 * all here the event detection itself is not enabled until 1356 * userspace asks for it by mma8452_write_event_config() 1357 */ 1358 .all_events = MMA8452_INT_DRDY | 1359 MMA8452_INT_TRANS | 1360 MMA8452_INT_FF_MT, 1361 .enabled_events = MMA8452_INT_TRANS | 1362 MMA8452_INT_FF_MT, 1363 }, 1364 [mma8453] = { 1365 .name = "mma8453", 1366 .chip_id = MMA8453_DEVICE_ID, 1367 .channels = mma8453_channels, 1368 .num_channels = ARRAY_SIZE(mma8453_channels), 1369 .mma_scales = { {0, 38307}, {0, 76614}, {0, 153228} }, 1370 /* 1371 * Although we enable the interrupt sources once and for 1372 * all here the event detection itself is not enabled until 1373 * userspace asks for it by mma8452_write_event_config() 1374 */ 1375 .all_events = MMA8452_INT_DRDY | 1376 MMA8452_INT_TRANS | 1377 MMA8452_INT_FF_MT, 1378 .enabled_events = MMA8452_INT_TRANS | 1379 MMA8452_INT_FF_MT, 1380 }, 1381 [mma8652] = { 1382 .name = "mma8652", 1383 .chip_id = MMA8652_DEVICE_ID, 1384 .channels = mma8652_channels, 1385 .num_channels = ARRAY_SIZE(mma8652_channels), 1386 .mma_scales = { {0, 9577}, {0, 19154}, {0, 38307} }, 1387 .all_events = MMA8452_INT_DRDY | 1388 MMA8452_INT_FF_MT, 1389 .enabled_events = MMA8452_INT_FF_MT, 1390 }, 1391 [mma8653] = { 1392 .name = "mma8653", 1393 .chip_id = MMA8653_DEVICE_ID, 1394 .channels = mma8653_channels, 1395 .num_channels = ARRAY_SIZE(mma8653_channels), 1396 .mma_scales = { {0, 38307}, {0, 76614}, {0, 153228} }, 1397 /* 1398 * Although we enable the interrupt sources once and for 1399 * all here the event detection itself is not enabled until 1400 * userspace asks for it by mma8452_write_event_config() 1401 */ 1402 .all_events = MMA8452_INT_DRDY | 1403 MMA8452_INT_FF_MT, 1404 .enabled_events = MMA8452_INT_FF_MT, 1405 }, 1406 [fxls8471] = { 1407 .name = "fxls8471", 1408 .chip_id = FXLS8471_DEVICE_ID, 1409 .channels = mma8451_channels, 1410 .num_channels = ARRAY_SIZE(mma8451_channels), 1411 .mma_scales = { {0, 2394}, {0, 4788}, {0, 9577} }, 1412 /* 1413 * Although we enable the interrupt sources once and for 1414 * all here the event detection itself is not enabled until 1415 * userspace asks for it by mma8452_write_event_config() 1416 */ 1417 .all_events = MMA8452_INT_DRDY | 1418 MMA8452_INT_TRANS | 1419 MMA8452_INT_FF_MT, 1420 .enabled_events = MMA8452_INT_TRANS | 1421 MMA8452_INT_FF_MT, 1422 }, 1423 }; 1424 1425 static struct attribute *mma8452_attributes[] = { 1426 &iio_dev_attr_sampling_frequency_available.dev_attr.attr, 1427 &iio_dev_attr_in_accel_scale_available.dev_attr.attr, 1428 &iio_dev_attr_in_accel_filter_high_pass_3db_frequency_available.dev_attr.attr, 1429 &iio_dev_attr_in_accel_oversampling_ratio_available.dev_attr.attr, 1430 NULL 1431 }; 1432 1433 static const struct attribute_group mma8452_group = { 1434 .attrs = mma8452_attributes, 1435 }; 1436 1437 static const struct iio_info mma8452_info = { 1438 .attrs = &mma8452_group, 1439 .read_raw = &mma8452_read_raw, 1440 .write_raw = &mma8452_write_raw, 1441 .event_attrs = &mma8452_event_attribute_group, 1442 .read_event_value = &mma8452_read_event_value, 1443 .write_event_value = &mma8452_write_event_value, 1444 .read_event_config = &mma8452_read_event_config, 1445 .write_event_config = &mma8452_write_event_config, 1446 .debugfs_reg_access = &mma8452_reg_access_dbg, 1447 }; 1448 1449 static const unsigned long mma8452_scan_masks[] = {0x7, 0}; 1450 1451 static int mma8452_data_rdy_trigger_set_state(struct iio_trigger *trig, 1452 bool state) 1453 { 1454 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); 1455 struct mma8452_data *data = iio_priv(indio_dev); 1456 int reg, ret; 1457 1458 ret = mma8452_set_runtime_pm_state(data->client, state); 1459 if (ret) 1460 return ret; 1461 1462 reg = i2c_smbus_read_byte_data(data->client, MMA8452_CTRL_REG4); 1463 if (reg < 0) 1464 return reg; 1465 1466 if (state) 1467 reg |= MMA8452_INT_DRDY; 1468 else 1469 reg &= ~MMA8452_INT_DRDY; 1470 1471 return mma8452_change_config(data, MMA8452_CTRL_REG4, reg); 1472 } 1473 1474 static const struct iio_trigger_ops mma8452_trigger_ops = { 1475 .set_trigger_state = mma8452_data_rdy_trigger_set_state, 1476 .validate_device = iio_trigger_validate_own_device, 1477 }; 1478 1479 static int mma8452_trigger_setup(struct iio_dev *indio_dev) 1480 { 1481 struct mma8452_data *data = iio_priv(indio_dev); 1482 struct iio_trigger *trig; 1483 int ret; 1484 1485 trig = devm_iio_trigger_alloc(&data->client->dev, "%s-dev%d", 1486 indio_dev->name, 1487 iio_device_id(indio_dev)); 1488 if (!trig) 1489 return -ENOMEM; 1490 1491 trig->ops = &mma8452_trigger_ops; 1492 iio_trigger_set_drvdata(trig, indio_dev); 1493 1494 ret = iio_trigger_register(trig); 1495 if (ret) 1496 return ret; 1497 1498 indio_dev->trig = iio_trigger_get(trig); 1499 1500 return 0; 1501 } 1502 1503 static void mma8452_trigger_cleanup(struct iio_dev *indio_dev) 1504 { 1505 if (indio_dev->trig) 1506 iio_trigger_unregister(indio_dev->trig); 1507 } 1508 1509 static int mma8452_reset(struct i2c_client *client) 1510 { 1511 int i; 1512 int ret; 1513 1514 /* 1515 * Find on fxls8471, after config reset bit, it reset immediately, 1516 * and will not give ACK, so here do not check the return value. 1517 * The following code will read the reset register, and check whether 1518 * this reset works. 1519 */ 1520 i2c_smbus_write_byte_data(client, MMA8452_CTRL_REG2, 1521 MMA8452_CTRL_REG2_RST); 1522 1523 for (i = 0; i < 10; i++) { 1524 usleep_range(100, 200); 1525 ret = i2c_smbus_read_byte_data(client, MMA8452_CTRL_REG2); 1526 if (ret == -EIO) 1527 continue; /* I2C comm reset */ 1528 if (ret < 0) 1529 return ret; 1530 if (!(ret & MMA8452_CTRL_REG2_RST)) 1531 return 0; 1532 } 1533 1534 return -ETIMEDOUT; 1535 } 1536 1537 static const struct of_device_id mma8452_dt_ids[] = { 1538 { .compatible = "fsl,mma8451", .data = &mma_chip_info_table[mma8451] }, 1539 { .compatible = "fsl,mma8452", .data = &mma_chip_info_table[mma8452] }, 1540 { .compatible = "fsl,mma8453", .data = &mma_chip_info_table[mma8453] }, 1541 { .compatible = "fsl,mma8652", .data = &mma_chip_info_table[mma8652] }, 1542 { .compatible = "fsl,mma8653", .data = &mma_chip_info_table[mma8653] }, 1543 { .compatible = "fsl,fxls8471", .data = &mma_chip_info_table[fxls8471] }, 1544 { } 1545 }; 1546 MODULE_DEVICE_TABLE(of, mma8452_dt_ids); 1547 1548 static int mma8452_probe(struct i2c_client *client, 1549 const struct i2c_device_id *id) 1550 { 1551 struct mma8452_data *data; 1552 struct iio_dev *indio_dev; 1553 int ret; 1554 1555 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); 1556 if (!indio_dev) 1557 return -ENOMEM; 1558 1559 data = iio_priv(indio_dev); 1560 data->client = client; 1561 mutex_init(&data->lock); 1562 1563 data->chip_info = device_get_match_data(&client->dev); 1564 if (!data->chip_info) { 1565 if (id) { 1566 data->chip_info = &mma_chip_info_table[id->driver_data]; 1567 } else { 1568 dev_err(&client->dev, "unknown device model\n"); 1569 return -ENODEV; 1570 } 1571 } 1572 1573 ret = iio_read_mount_matrix(&client->dev, &data->orientation); 1574 if (ret) 1575 return ret; 1576 1577 data->vdd_reg = devm_regulator_get(&client->dev, "vdd"); 1578 if (IS_ERR(data->vdd_reg)) 1579 return dev_err_probe(&client->dev, PTR_ERR(data->vdd_reg), 1580 "failed to get VDD regulator!\n"); 1581 1582 data->vddio_reg = devm_regulator_get(&client->dev, "vddio"); 1583 if (IS_ERR(data->vddio_reg)) 1584 return dev_err_probe(&client->dev, PTR_ERR(data->vddio_reg), 1585 "failed to get VDDIO regulator!\n"); 1586 1587 ret = regulator_enable(data->vdd_reg); 1588 if (ret) { 1589 dev_err(&client->dev, "failed to enable VDD regulator!\n"); 1590 return ret; 1591 } 1592 1593 ret = regulator_enable(data->vddio_reg); 1594 if (ret) { 1595 dev_err(&client->dev, "failed to enable VDDIO regulator!\n"); 1596 goto disable_regulator_vdd; 1597 } 1598 1599 ret = i2c_smbus_read_byte_data(client, MMA8452_WHO_AM_I); 1600 if (ret < 0) 1601 goto disable_regulators; 1602 1603 switch (ret) { 1604 case MMA8451_DEVICE_ID: 1605 case MMA8452_DEVICE_ID: 1606 case MMA8453_DEVICE_ID: 1607 case MMA8652_DEVICE_ID: 1608 case MMA8653_DEVICE_ID: 1609 case FXLS8471_DEVICE_ID: 1610 if (ret == data->chip_info->chip_id) 1611 break; 1612 fallthrough; 1613 default: 1614 ret = -ENODEV; 1615 goto disable_regulators; 1616 } 1617 1618 dev_info(&client->dev, "registering %s accelerometer; ID 0x%x\n", 1619 data->chip_info->name, data->chip_info->chip_id); 1620 1621 i2c_set_clientdata(client, indio_dev); 1622 indio_dev->info = &mma8452_info; 1623 indio_dev->name = data->chip_info->name; 1624 indio_dev->modes = INDIO_DIRECT_MODE; 1625 indio_dev->channels = data->chip_info->channels; 1626 indio_dev->num_channels = data->chip_info->num_channels; 1627 indio_dev->available_scan_masks = mma8452_scan_masks; 1628 1629 ret = mma8452_reset(client); 1630 if (ret < 0) 1631 goto disable_regulators; 1632 1633 data->data_cfg = MMA8452_DATA_CFG_FS_2G; 1634 ret = i2c_smbus_write_byte_data(client, MMA8452_DATA_CFG, 1635 data->data_cfg); 1636 if (ret < 0) 1637 goto disable_regulators; 1638 1639 /* 1640 * By default set transient threshold to max to avoid events if 1641 * enabling without configuring threshold. 1642 */ 1643 ret = i2c_smbus_write_byte_data(client, MMA8452_TRANSIENT_THS, 1644 MMA8452_TRANSIENT_THS_MASK); 1645 if (ret < 0) 1646 goto disable_regulators; 1647 1648 if (client->irq) { 1649 int irq2; 1650 1651 irq2 = of_irq_get_byname(client->dev.of_node, "INT2"); 1652 1653 if (irq2 == client->irq) { 1654 dev_dbg(&client->dev, "using interrupt line INT2\n"); 1655 } else { 1656 ret = i2c_smbus_write_byte_data(client, 1657 MMA8452_CTRL_REG5, 1658 data->chip_info->all_events); 1659 if (ret < 0) 1660 goto disable_regulators; 1661 1662 dev_dbg(&client->dev, "using interrupt line INT1\n"); 1663 } 1664 1665 ret = i2c_smbus_write_byte_data(client, 1666 MMA8452_CTRL_REG4, 1667 data->chip_info->enabled_events); 1668 if (ret < 0) 1669 goto disable_regulators; 1670 1671 ret = mma8452_trigger_setup(indio_dev); 1672 if (ret < 0) 1673 goto disable_regulators; 1674 } 1675 1676 data->ctrl_reg1 = MMA8452_CTRL_ACTIVE | 1677 (MMA8452_CTRL_DR_DEFAULT << MMA8452_CTRL_DR_SHIFT); 1678 1679 data->sleep_val = mma8452_calculate_sleep(data); 1680 1681 ret = i2c_smbus_write_byte_data(client, MMA8452_CTRL_REG1, 1682 data->ctrl_reg1); 1683 if (ret < 0) 1684 goto trigger_cleanup; 1685 1686 ret = iio_triggered_buffer_setup(indio_dev, NULL, 1687 mma8452_trigger_handler, NULL); 1688 if (ret < 0) 1689 goto trigger_cleanup; 1690 1691 if (client->irq) { 1692 ret = devm_request_threaded_irq(&client->dev, 1693 client->irq, 1694 NULL, mma8452_interrupt, 1695 IRQF_TRIGGER_LOW | IRQF_ONESHOT, 1696 client->name, indio_dev); 1697 if (ret) 1698 goto buffer_cleanup; 1699 } 1700 1701 ret = pm_runtime_set_active(&client->dev); 1702 if (ret < 0) 1703 goto buffer_cleanup; 1704 1705 pm_runtime_enable(&client->dev); 1706 pm_runtime_set_autosuspend_delay(&client->dev, 1707 MMA8452_AUTO_SUSPEND_DELAY_MS); 1708 pm_runtime_use_autosuspend(&client->dev); 1709 1710 ret = iio_device_register(indio_dev); 1711 if (ret < 0) 1712 goto buffer_cleanup; 1713 1714 ret = mma8452_set_freefall_mode(data, false); 1715 if (ret < 0) 1716 goto unregister_device; 1717 1718 return 0; 1719 1720 unregister_device: 1721 iio_device_unregister(indio_dev); 1722 1723 buffer_cleanup: 1724 iio_triggered_buffer_cleanup(indio_dev); 1725 1726 trigger_cleanup: 1727 mma8452_trigger_cleanup(indio_dev); 1728 1729 disable_regulators: 1730 regulator_disable(data->vddio_reg); 1731 1732 disable_regulator_vdd: 1733 regulator_disable(data->vdd_reg); 1734 1735 return ret; 1736 } 1737 1738 static int mma8452_remove(struct i2c_client *client) 1739 { 1740 struct iio_dev *indio_dev = i2c_get_clientdata(client); 1741 struct mma8452_data *data = iio_priv(indio_dev); 1742 1743 iio_device_unregister(indio_dev); 1744 1745 pm_runtime_disable(&client->dev); 1746 pm_runtime_set_suspended(&client->dev); 1747 1748 iio_triggered_buffer_cleanup(indio_dev); 1749 mma8452_trigger_cleanup(indio_dev); 1750 mma8452_standby(iio_priv(indio_dev)); 1751 1752 regulator_disable(data->vddio_reg); 1753 regulator_disable(data->vdd_reg); 1754 1755 return 0; 1756 } 1757 1758 #ifdef CONFIG_PM 1759 static int mma8452_runtime_suspend(struct device *dev) 1760 { 1761 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 1762 struct mma8452_data *data = iio_priv(indio_dev); 1763 int ret; 1764 1765 mutex_lock(&data->lock); 1766 ret = mma8452_standby(data); 1767 mutex_unlock(&data->lock); 1768 if (ret < 0) { 1769 dev_err(&data->client->dev, "powering off device failed\n"); 1770 return -EAGAIN; 1771 } 1772 1773 ret = regulator_disable(data->vddio_reg); 1774 if (ret) { 1775 dev_err(dev, "failed to disable VDDIO regulator\n"); 1776 return ret; 1777 } 1778 1779 ret = regulator_disable(data->vdd_reg); 1780 if (ret) { 1781 dev_err(dev, "failed to disable VDD regulator\n"); 1782 return ret; 1783 } 1784 1785 return 0; 1786 } 1787 1788 static int mma8452_runtime_resume(struct device *dev) 1789 { 1790 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 1791 struct mma8452_data *data = iio_priv(indio_dev); 1792 int ret, sleep_val; 1793 1794 ret = regulator_enable(data->vdd_reg); 1795 if (ret) { 1796 dev_err(dev, "failed to enable VDD regulator\n"); 1797 return ret; 1798 } 1799 1800 ret = regulator_enable(data->vddio_reg); 1801 if (ret) { 1802 dev_err(dev, "failed to enable VDDIO regulator\n"); 1803 regulator_disable(data->vdd_reg); 1804 return ret; 1805 } 1806 1807 ret = mma8452_active(data); 1808 if (ret < 0) 1809 goto runtime_resume_failed; 1810 1811 ret = mma8452_get_odr_index(data); 1812 sleep_val = 1000 / mma8452_samp_freq[ret][0]; 1813 if (sleep_val < 20) 1814 usleep_range(sleep_val * 1000, 20000); 1815 else 1816 msleep_interruptible(sleep_val); 1817 1818 return 0; 1819 1820 runtime_resume_failed: 1821 regulator_disable(data->vddio_reg); 1822 regulator_disable(data->vdd_reg); 1823 1824 return ret; 1825 } 1826 #endif 1827 1828 static const struct dev_pm_ops mma8452_pm_ops = { 1829 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, pm_runtime_force_resume) 1830 SET_RUNTIME_PM_OPS(mma8452_runtime_suspend, 1831 mma8452_runtime_resume, NULL) 1832 }; 1833 1834 static const struct i2c_device_id mma8452_id[] = { 1835 { "mma8451", mma8451 }, 1836 { "mma8452", mma8452 }, 1837 { "mma8453", mma8453 }, 1838 { "mma8652", mma8652 }, 1839 { "mma8653", mma8653 }, 1840 { "fxls8471", fxls8471 }, 1841 { } 1842 }; 1843 MODULE_DEVICE_TABLE(i2c, mma8452_id); 1844 1845 static struct i2c_driver mma8452_driver = { 1846 .driver = { 1847 .name = "mma8452", 1848 .of_match_table = mma8452_dt_ids, 1849 .pm = &mma8452_pm_ops, 1850 }, 1851 .probe = mma8452_probe, 1852 .remove = mma8452_remove, 1853 .id_table = mma8452_id, 1854 }; 1855 module_i2c_driver(mma8452_driver); 1856 1857 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>"); 1858 MODULE_DESCRIPTION("Freescale / NXP MMA8452 accelerometer driver"); 1859 MODULE_LICENSE("GPL"); 1860