306 lines
8.6 KiB
C
306 lines
8.6 KiB
C
/* Copyright (c) 2014-2017, NVIDIA CORPORATION. All rights reserved.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/nvs.h>
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#include <linux/of.h>
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#include <linux/string.h>
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#include <linux/export.h>
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const char * const nvs_float_significances[] = {
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"micro",
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"nano",
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};
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EXPORT_SYMBOL_GPL(nvs_float_significances);
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/**
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* nvs_of_dt - NVS sensor device tree configuration.
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* @np: mandatory device node pointer.
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* @cfg: sensor's configuration pointer.
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* This can be called early with cfg == NULL to determine
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* if the device is available based on returned -ENODEV or
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* -EINVAL.
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* @dev_name: name of sensor device. If this is NULL then the
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* sensor configuration's name member is used.
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*
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* Returns: -EINVAL = np and/or cfg are NULL.
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* -ENODEV = if device is not available.
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* 0 = no default configuration changes were made.
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* >0 = number of default configuration changes made.
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* Note this does not include expected device tree
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* configuration settings such as matrix and
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* calibration. Also not included is whether the
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* device was disabled via the NVS mechanism.
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*/
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int nvs_of_dt(const struct device_node *np, struct sensor_cfg *cfg,
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const char *dev_name)
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{
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s32 s32tmp = 0;
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u32 u32tmp = 0;
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char str[256];
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const char *charp;
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int lenp;
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unsigned int i;
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unsigned int cfg_changes = 0;
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if (np == NULL)
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return -EINVAL;
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if (!of_device_is_available(np))
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return -ENODEV;
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if (cfg == NULL)
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return -EINVAL;
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if (dev_name == NULL)
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dev_name = cfg->name;
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if (snprintf(str, sizeof(str), "%s_disable", dev_name) > 0) {
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if (!of_property_read_u32(np, str, (u32 *)&i)) {
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if (i)
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cfg->snsr_id = -1;
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}
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}
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if (snprintf(str, sizeof(str), "%s_float_significance", dev_name) > 0) {
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if (!of_property_read_string((struct device_node *)np,
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str, &charp)) {
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u32tmp = ARRAY_SIZE(nvs_float_significances);
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for (i = 0; i < u32tmp; i++) {
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if (!strcasecmp(charp,
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nvs_float_significances[i])) {
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if (cfg->float_significance != i) {
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cfg->float_significance = i;
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cfg_changes++;
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}
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break;
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}
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}
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}
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}
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if (snprintf(str, sizeof(str), "%s_flags", dev_name) > 0) {
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if (!of_property_read_u32(np, str, &u32tmp)) {
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i = cfg->flags & SENSOR_FLAG_READONLY_MASK;
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u32tmp &= ~SENSOR_FLAG_READONLY_MASK;
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i |= u32tmp;
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if (cfg->flags != i) {
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cfg->flags = i;
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cfg_changes++;
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}
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}
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}
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if (snprintf(str, sizeof(str), "%s_kbuffer_size", dev_name) > 0) {
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if (!of_property_read_s32(np, str, &s32tmp)) {
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if (cfg->kbuf_sz != s32tmp) {
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cfg->kbuf_sz = s32tmp;
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cfg_changes++;
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}
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}
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}
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if (snprintf(str, sizeof(str), "%s_max_range_ival", dev_name) > 0) {
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if (!of_property_read_s32(np, str, &s32tmp)) {
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if (cfg->max_range.ival != s32tmp) {
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cfg->max_range.ival = s32tmp;
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cfg_changes++;
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}
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}
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}
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if (snprintf(str, sizeof(str), "%s_max_range_fval", dev_name) > 0) {
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if (!of_property_read_s32(np, str, &s32tmp)) {
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if (cfg->max_range.fval != s32tmp) {
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cfg->max_range.fval = s32tmp;
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cfg_changes++;
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}
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}
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}
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if (snprintf(str, sizeof(str), "%s_resolution_ival", dev_name) > 0) {
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if (!of_property_read_s32(np, str, &s32tmp)) {
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if (cfg->resolution.ival != s32tmp) {
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cfg->resolution.ival = s32tmp;
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cfg_changes++;
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}
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}
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}
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if (snprintf(str, sizeof(str), "%s_resolution_fval", dev_name) > 0) {
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if (!of_property_read_s32(np, str, &s32tmp)) {
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if (cfg->resolution.fval != s32tmp) {
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cfg->resolution.fval = s32tmp;
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cfg_changes++;
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}
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}
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}
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if (snprintf(str, sizeof(str), "%s_milliamp_ival", dev_name) > 0) {
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if (!of_property_read_s32(np, str, &s32tmp)) {
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if (cfg->milliamp.ival != s32tmp) {
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cfg->milliamp.ival = s32tmp;
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cfg_changes++;
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}
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}
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}
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if (snprintf(str, sizeof(str), "%s_milliamp_fval", dev_name) > 0) {
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if (!of_property_read_s32(np, str, &s32tmp)) {
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if (cfg->milliamp.fval != s32tmp) {
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cfg->milliamp.fval = s32tmp;
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cfg_changes++;
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}
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}
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}
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if (snprintf(str, sizeof(str), "%s_delay_us_min", dev_name) > 0) {
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if (!of_property_read_s32(np, str, &s32tmp)) {
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if (cfg->delay_us_min != s32tmp) {
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cfg->delay_us_min = s32tmp;
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cfg_changes++;
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}
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}
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}
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if (snprintf(str, sizeof(str), "%s_delay_us_max", dev_name) > 0) {
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if (!of_property_read_s32(np, str, &s32tmp)) {
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if (cfg->delay_us_max != s32tmp) {
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cfg->delay_us_max = s32tmp;
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cfg_changes++;
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}
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}
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}
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if (snprintf(str, sizeof(str), "%s_fifo_reserved_event_count", dev_name) > 0) {
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if (!of_property_read_u32(np, str, &u32tmp)) {
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if (cfg->fifo_rsrv_evnt_cnt != u32tmp) {
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cfg->fifo_rsrv_evnt_cnt = u32tmp;
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cfg_changes++;
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}
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}
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}
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if (snprintf(str, sizeof(str), "%s_fifo_max_event_count", dev_name) > 0) {
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if (!of_property_read_u32(np, str, &u32tmp)) {
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if (cfg->fifo_max_evnt_cnt != u32tmp) {
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cfg->fifo_max_evnt_cnt = u32tmp;
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cfg_changes++;
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}
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}
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}
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if (snprintf(str, sizeof(str), "%s_matrix", dev_name) > 0) {
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charp = of_get_property(np, str, &lenp);
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if (charp && lenp == sizeof(cfg->matrix))
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memcpy(&cfg->matrix, charp, lenp);
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}
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if (snprintf(str, sizeof(str), "%s_uncalibrated_lo", dev_name) > 0)
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of_property_read_s32(np, str, (s32 *)&cfg->uncal_lo);
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if (snprintf(str, sizeof(str), "%s_uncalibrated_hi", dev_name) > 0)
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of_property_read_s32(np, str, (s32 *)&cfg->uncal_hi);
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if (snprintf(str, sizeof(str), "%s_calibrated_lo", dev_name) > 0)
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of_property_read_s32(np, str, (s32 *)&cfg->cal_lo);
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if (snprintf(str, sizeof(str), "%s_calibrated_hi", dev_name) > 0)
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of_property_read_s32(np, str, (s32 *)&cfg->cal_hi);
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if (snprintf(str, sizeof(str), "%s_threshold_lo", dev_name) > 0) {
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if (!of_property_read_s32(np, str, &s32tmp)) {
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if (cfg->thresh_lo != s32tmp) {
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cfg->thresh_lo = s32tmp;
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cfg_changes++;
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}
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}
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}
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if (snprintf(str, sizeof(str), "%s_threshold_hi", dev_name) > 0) {
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if (!of_property_read_s32(np, str, &s32tmp)) {
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if (cfg->thresh_hi != s32tmp) {
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cfg->thresh_hi = s32tmp;
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cfg_changes++;
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}
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}
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}
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if (snprintf(str, sizeof(str), "%s_report_count", dev_name) > 0) {
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if (!of_property_read_s32(np, str, &s32tmp)) {
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if (cfg->report_n != s32tmp) {
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cfg->report_n = s32tmp;
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cfg_changes++;
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}
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}
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}
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if (snprintf(str, sizeof(str), "%s_scale_ival", dev_name) > 0) {
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if (!of_property_read_s32(np, str, &s32tmp)) {
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if (cfg->scale.ival != s32tmp) {
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cfg->scale.ival = s32tmp;
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cfg_changes++;
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}
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}
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}
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if (snprintf(str, sizeof(str), "%s_scale_fval", dev_name) > 0) {
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if (!of_property_read_s32(np, str, &s32tmp)) {
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if (cfg->scale.fval != s32tmp) {
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cfg->scale.fval = s32tmp;
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cfg_changes++;
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}
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}
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}
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if (snprintf(str, sizeof(str), "%s_offset_ival", dev_name) > 0) {
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if (!of_property_read_s32(np, str, &s32tmp)) {
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if (cfg->offset.ival != s32tmp) {
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cfg->offset.ival = s32tmp;
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cfg_changes++;
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}
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}
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}
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if (snprintf(str, sizeof(str), "%s_offset_fval", dev_name) > 0) {
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if (!of_property_read_s32(np, str, &s32tmp)) {
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if (cfg->offset.fval != s32tmp) {
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cfg->offset.fval = s32tmp;
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cfg_changes++;
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}
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}
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}
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for (i = 0; i < cfg->ch_n_max; i++) {
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if (snprintf(str, sizeof(str), "%s_scale_ival_ch%u",
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dev_name, i) > 0) {
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if (!of_property_read_s32(np, str, &s32tmp)) {
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if (cfg->scales[i].ival != s32tmp) {
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cfg->scales[i].ival = s32tmp;
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cfg_changes++;
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}
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}
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}
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if (snprintf(str, sizeof(str), "%s_scale_fval_ch%u",
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dev_name, i) > 0) {
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if (!of_property_read_s32(np, str, &s32tmp)) {
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if (cfg->scales[i].fval != s32tmp) {
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cfg->scales[i].fval = s32tmp;
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cfg_changes++;
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}
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}
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}
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if (snprintf(str, sizeof(str), "%s_offset_ival_ch%u",
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dev_name, i) > 0) {
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if (!of_property_read_s32(np, str, &s32tmp)) {
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if (cfg->offsets[i].ival != s32tmp) {
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cfg->offsets[i].ival = s32tmp;
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cfg_changes++;
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}
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}
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}
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if (snprintf(str, sizeof(str), "%s_offset_fval_ch%u",
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dev_name, i) > 0) {
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if (!of_property_read_s32(np, str, &s32tmp)) {
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if (cfg->offsets[i].fval != s32tmp) {
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cfg->offsets[i].fval = s32tmp;
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cfg_changes++;
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}
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}
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}
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}
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return cfg_changes;
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}
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EXPORT_SYMBOL_GPL(nvs_of_dt);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("NVidia Sensor Open Firmware Device Tree module");
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MODULE_AUTHOR("NVIDIA Corporation");
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