1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2020 Invensense, Inc. 4 */ 5 6 #include <linux/kernel.h> 7 #include <linux/device.h> 8 #include <linux/mutex.h> 9 #include <linux/pm_runtime.h> 10 #include <linux/regmap.h> 11 #include <linux/iio/iio.h> 12 13 #include "inv_icm42600.h" 14 #include "inv_icm42600_temp.h" 15 16 static int inv_icm42600_temp_read(struct inv_icm42600_state *st, int16_t *temp) 17 { 18 struct device *dev = regmap_get_device(st->map); 19 __be16 *raw; 20 int ret; 21 22 pm_runtime_get_sync(dev); 23 mutex_lock(&st->lock); 24 25 ret = inv_icm42600_set_temp_conf(st, true, NULL); 26 if (ret) 27 goto exit; 28 29 raw = (__be16 *)&st->buffer[0]; 30 ret = regmap_bulk_read(st->map, INV_ICM42600_REG_TEMP_DATA, raw, sizeof(*raw)); 31 if (ret) 32 goto exit; 33 34 *temp = (int16_t)be16_to_cpup(raw); 35 if (*temp == INV_ICM42600_DATA_INVALID) 36 ret = -EINVAL; 37 38 exit: 39 mutex_unlock(&st->lock); 40 pm_runtime_mark_last_busy(dev); 41 pm_runtime_put_autosuspend(dev); 42 43 return ret; 44 } 45 46 int inv_icm42600_temp_read_raw(struct iio_dev *indio_dev, 47 struct iio_chan_spec const *chan, 48 int *val, int *val2, long mask) 49 { 50 struct inv_icm42600_state *st = iio_device_get_drvdata(indio_dev); 51 int16_t temp; 52 int ret; 53 54 if (chan->type != IIO_TEMP) 55 return -EINVAL; 56 57 switch (mask) { 58 case IIO_CHAN_INFO_RAW: 59 ret = iio_device_claim_direct_mode(indio_dev); 60 if (ret) 61 return ret; 62 ret = inv_icm42600_temp_read(st, &temp); 63 iio_device_release_direct_mode(indio_dev); 64 if (ret) 65 return ret; 66 *val = temp; 67 return IIO_VAL_INT; 68 /* 69 * T°C = (temp / 132.48) + 25 70 * Tm°C = 1000 * ((temp * 100 / 13248) + 25) 71 * scale: 100000 / 13248 ~= 7.548309 72 * offset: 25000 73 */ 74 case IIO_CHAN_INFO_SCALE: 75 *val = 7; 76 *val2 = 548309; 77 return IIO_VAL_INT_PLUS_MICRO; 78 case IIO_CHAN_INFO_OFFSET: 79 *val = 25000; 80 return IIO_VAL_INT; 81 default: 82 return -EINVAL; 83 } 84 } 85