605 строки
15 KiB
C
605 строки
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* of-thermal.c - Generic Thermal Management device tree support.
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*
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* Copyright (C) 2013 Texas Instruments
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* Copyright (C) 2013 Eduardo Valentin <eduardo.valentin@ti.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/err.h>
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#include <linux/export.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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#include <linux/thermal.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include "thermal_core.h"
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/*** functions parsing device tree nodes ***/
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static int of_find_trip_id(struct device_node *np, struct device_node *trip)
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{
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struct device_node *trips;
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struct device_node *t;
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int i = 0;
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trips = of_get_child_by_name(np, "trips");
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if (!trips) {
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pr_err("Failed to find 'trips' node\n");
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return -EINVAL;
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}
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/*
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* Find the trip id point associated with the cooling device map
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*/
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for_each_child_of_node(trips, t) {
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if (t == trip)
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goto out;
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i++;
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}
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i = -ENXIO;
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out:
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of_node_put(trips);
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return i;
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}
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/*
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* It maps 'enum thermal_trip_type' found in include/linux/thermal.h
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* into the device tree binding of 'trip', property type.
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*/
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static const char * const trip_types[] = {
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[THERMAL_TRIP_ACTIVE] = "active",
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[THERMAL_TRIP_PASSIVE] = "passive",
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[THERMAL_TRIP_HOT] = "hot",
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[THERMAL_TRIP_CRITICAL] = "critical",
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};
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/**
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* thermal_of_get_trip_type - Get phy mode for given device_node
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* @np: Pointer to the given device_node
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* @type: Pointer to resulting trip type
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*
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* The function gets trip type string from property 'type',
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* and store its index in trip_types table in @type,
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*
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* Return: 0 on success, or errno in error case.
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*/
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static int thermal_of_get_trip_type(struct device_node *np,
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enum thermal_trip_type *type)
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{
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const char *t;
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int err, i;
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err = of_property_read_string(np, "type", &t);
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if (err < 0)
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return err;
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for (i = 0; i < ARRAY_SIZE(trip_types); i++)
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if (!strcasecmp(t, trip_types[i])) {
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*type = i;
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return 0;
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}
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return -ENODEV;
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}
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static int thermal_of_populate_trip(struct device_node *np,
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struct thermal_trip *trip)
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{
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int prop;
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int ret;
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ret = of_property_read_u32(np, "temperature", &prop);
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if (ret < 0) {
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pr_err("missing temperature property\n");
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return ret;
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}
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trip->temperature = prop;
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ret = of_property_read_u32(np, "hysteresis", &prop);
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if (ret < 0) {
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pr_err("missing hysteresis property\n");
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return ret;
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}
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trip->hysteresis = prop;
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ret = thermal_of_get_trip_type(np, &trip->type);
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if (ret < 0) {
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pr_err("wrong trip type property\n");
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return ret;
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}
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return 0;
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}
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static struct thermal_trip *thermal_of_trips_init(struct device_node *np, int *ntrips)
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{
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struct thermal_trip *tt;
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struct device_node *trips, *trip;
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int ret, count;
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trips = of_get_child_by_name(np, "trips");
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if (!trips) {
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pr_err("Failed to find 'trips' node\n");
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return ERR_PTR(-EINVAL);
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}
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count = of_get_child_count(trips);
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if (!count) {
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pr_err("No trip point defined\n");
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ret = -EINVAL;
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goto out_of_node_put;
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}
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tt = kzalloc(sizeof(*tt) * count, GFP_KERNEL);
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if (!tt) {
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ret = -ENOMEM;
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goto out_of_node_put;
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}
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*ntrips = count;
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count = 0;
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for_each_child_of_node(trips, trip) {
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ret = thermal_of_populate_trip(trip, &tt[count++]);
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if (ret)
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goto out_kfree;
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}
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of_node_put(trips);
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return tt;
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out_kfree:
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kfree(tt);
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*ntrips = 0;
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out_of_node_put:
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of_node_put(trips);
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return ERR_PTR(ret);
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}
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static struct device_node *of_thermal_zone_find(struct device_node *sensor, int id)
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{
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struct device_node *np, *tz;
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struct of_phandle_args sensor_specs;
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np = of_find_node_by_name(NULL, "thermal-zones");
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if (!np) {
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pr_debug("No thermal zones description\n");
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return ERR_PTR(-ENODEV);
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}
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/*
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* Search for each thermal zone, a defined sensor
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* corresponding to the one passed as parameter
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*/
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for_each_available_child_of_node(np, tz) {
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int count, i;
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count = of_count_phandle_with_args(tz, "thermal-sensors",
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"#thermal-sensor-cells");
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if (count <= 0) {
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pr_err("%pOFn: missing thermal sensor\n", tz);
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tz = ERR_PTR(-EINVAL);
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goto out;
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}
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for (i = 0; i < count; i++) {
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int ret;
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ret = of_parse_phandle_with_args(tz, "thermal-sensors",
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"#thermal-sensor-cells",
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i, &sensor_specs);
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if (ret < 0) {
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pr_err("%pOFn: Failed to read thermal-sensors cells: %d\n", tz, ret);
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tz = ERR_PTR(ret);
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goto out;
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}
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if ((sensor == sensor_specs.np) && id == (sensor_specs.args_count ?
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sensor_specs.args[0] : 0)) {
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pr_debug("sensor %pOFn id=%d belongs to %pOFn\n", sensor, id, tz);
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goto out;
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}
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}
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}
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tz = ERR_PTR(-ENODEV);
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out:
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of_node_put(np);
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return tz;
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}
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static int thermal_of_monitor_init(struct device_node *np, int *delay, int *pdelay)
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{
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int ret;
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ret = of_property_read_u32(np, "polling-delay-passive", pdelay);
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if (ret < 0) {
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pr_err("%pOFn: missing polling-delay-passive property\n", np);
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return ret;
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}
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ret = of_property_read_u32(np, "polling-delay", delay);
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if (ret < 0) {
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pr_err("%pOFn: missing polling-delay property\n", np);
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return ret;
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}
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return 0;
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}
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static void thermal_of_parameters_init(struct device_node *np,
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struct thermal_zone_params *tzp)
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{
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int coef[2];
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int ncoef = ARRAY_SIZE(coef);
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int prop, ret;
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tzp->no_hwmon = true;
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if (!of_property_read_u32(np, "sustainable-power", &prop))
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tzp->sustainable_power = prop;
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/*
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* For now, the thermal framework supports only one sensor per
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* thermal zone. Thus, we are considering only the first two
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* values as slope and offset.
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*/
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ret = of_property_read_u32_array(np, "coefficients", coef, ncoef);
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if (ret) {
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coef[0] = 1;
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coef[1] = 0;
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}
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tzp->slope = coef[0];
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tzp->offset = coef[1];
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}
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static struct device_node *thermal_of_zone_get_by_name(struct thermal_zone_device *tz)
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{
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struct device_node *np, *tz_np;
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np = of_find_node_by_name(NULL, "thermal-zones");
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if (!np)
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return ERR_PTR(-ENODEV);
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tz_np = of_get_child_by_name(np, tz->type);
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of_node_put(np);
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if (!tz_np)
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return ERR_PTR(-ENODEV);
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return tz_np;
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}
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static int __thermal_of_unbind(struct device_node *map_np, int index, int trip_id,
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struct thermal_zone_device *tz, struct thermal_cooling_device *cdev)
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{
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struct of_phandle_args cooling_spec;
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int ret;
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ret = of_parse_phandle_with_args(map_np, "cooling-device", "#cooling-cells",
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index, &cooling_spec);
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if (ret < 0) {
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pr_err("Invalid cooling-device entry\n");
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return ret;
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}
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of_node_put(cooling_spec.np);
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if (cooling_spec.args_count < 2) {
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pr_err("wrong reference to cooling device, missing limits\n");
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return -EINVAL;
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}
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if (cooling_spec.np != cdev->np)
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return 0;
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ret = thermal_zone_unbind_cooling_device(tz, trip_id, cdev);
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if (ret)
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pr_err("Failed to unbind '%s' with '%s': %d\n", tz->type, cdev->type, ret);
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return ret;
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}
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static int __thermal_of_bind(struct device_node *map_np, int index, int trip_id,
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struct thermal_zone_device *tz, struct thermal_cooling_device *cdev)
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{
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struct of_phandle_args cooling_spec;
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int ret, weight = THERMAL_WEIGHT_DEFAULT;
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of_property_read_u32(map_np, "contribution", &weight);
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ret = of_parse_phandle_with_args(map_np, "cooling-device", "#cooling-cells",
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index, &cooling_spec);
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if (ret < 0) {
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pr_err("Invalid cooling-device entry\n");
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return ret;
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}
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of_node_put(cooling_spec.np);
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if (cooling_spec.args_count < 2) {
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pr_err("wrong reference to cooling device, missing limits\n");
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return -EINVAL;
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}
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if (cooling_spec.np != cdev->np)
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return 0;
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ret = thermal_zone_bind_cooling_device(tz, trip_id, cdev, cooling_spec.args[1],
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cooling_spec.args[0],
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weight);
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if (ret)
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pr_err("Failed to bind '%s' with '%s': %d\n", tz->type, cdev->type, ret);
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return ret;
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}
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static int thermal_of_for_each_cooling_device(struct device_node *tz_np, struct device_node *map_np,
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struct thermal_zone_device *tz, struct thermal_cooling_device *cdev,
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int (*action)(struct device_node *, int, int,
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struct thermal_zone_device *, struct thermal_cooling_device *))
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{
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struct device_node *tr_np;
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int count, i, trip_id;
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tr_np = of_parse_phandle(map_np, "trip", 0);
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if (!tr_np)
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return -ENODEV;
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trip_id = of_find_trip_id(tz_np, tr_np);
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if (trip_id < 0)
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return trip_id;
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count = of_count_phandle_with_args(map_np, "cooling-device", "#cooling-cells");
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if (count <= 0) {
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pr_err("Add a cooling_device property with at least one device\n");
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return -ENOENT;
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}
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/*
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* At this point, we don't want to bail out when there is an
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* error, we will try to bind/unbind as many as possible
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* cooling devices
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*/
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for (i = 0; i < count; i++)
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action(map_np, i, trip_id, tz, cdev);
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return 0;
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}
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static int thermal_of_for_each_cooling_maps(struct thermal_zone_device *tz,
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struct thermal_cooling_device *cdev,
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int (*action)(struct device_node *, int, int,
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struct thermal_zone_device *, struct thermal_cooling_device *))
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{
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struct device_node *tz_np, *cm_np, *child;
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int ret = 0;
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tz_np = thermal_of_zone_get_by_name(tz);
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if (IS_ERR(tz_np)) {
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pr_err("Failed to get node tz by name\n");
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return PTR_ERR(tz_np);
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}
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cm_np = of_get_child_by_name(tz_np, "cooling-maps");
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if (!cm_np)
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goto out;
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for_each_child_of_node(cm_np, child) {
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ret = thermal_of_for_each_cooling_device(tz_np, child, tz, cdev, action);
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if (ret)
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break;
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}
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of_node_put(cm_np);
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out:
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of_node_put(tz_np);
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return ret;
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}
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static int thermal_of_bind(struct thermal_zone_device *tz,
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struct thermal_cooling_device *cdev)
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{
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return thermal_of_for_each_cooling_maps(tz, cdev, __thermal_of_bind);
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}
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static int thermal_of_unbind(struct thermal_zone_device *tz,
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struct thermal_cooling_device *cdev)
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{
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return thermal_of_for_each_cooling_maps(tz, cdev, __thermal_of_unbind);
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}
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/**
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* thermal_of_zone_unregister - Cleanup the specific allocated ressources
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*
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* This function disables the thermal zone and frees the different
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* ressources allocated specific to the thermal OF.
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*
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* @tz: a pointer to the thermal zone structure
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*/
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static void thermal_of_zone_unregister(struct thermal_zone_device *tz)
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{
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struct thermal_trip *trips = tz->trips;
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struct thermal_zone_device_ops *ops = tz->ops;
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thermal_zone_device_disable(tz);
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thermal_zone_device_unregister(tz);
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kfree(trips);
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kfree(ops);
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}
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/**
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* thermal_of_zone_register - Register a thermal zone with device node
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* sensor
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*
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* The thermal_of_zone_register() parses a device tree given a device
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* node sensor and identifier. It searches for the thermal zone
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* associated to the couple sensor/id and retrieves all the thermal
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* zone properties and registers new thermal zone with those
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* properties.
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*
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* @sensor: A device node pointer corresponding to the sensor in the device tree
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* @id: An integer as sensor identifier
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* @data: A private data to be stored in the thermal zone dedicated private area
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* @ops: A set of thermal sensor ops
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*
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* Return: a valid thermal zone structure pointer on success.
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* - EINVAL: if the device tree thermal description is malformed
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* - ENOMEM: if one structure can not be allocated
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* - Other negative errors are returned by the underlying called functions
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*/
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static struct thermal_zone_device *thermal_of_zone_register(struct device_node *sensor, int id, void *data,
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const struct thermal_zone_device_ops *ops)
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{
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struct thermal_zone_device *tz;
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struct thermal_trip *trips;
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struct thermal_zone_params tzp = {};
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struct thermal_zone_device_ops *of_ops;
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struct device_node *np;
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int delay, pdelay;
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int ntrips, mask;
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int ret;
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of_ops = kmemdup(ops, sizeof(*ops), GFP_KERNEL);
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if (!of_ops)
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return ERR_PTR(-ENOMEM);
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np = of_thermal_zone_find(sensor, id);
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if (IS_ERR(np)) {
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if (PTR_ERR(np) != -ENODEV)
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pr_err("Failed to find thermal zone for %pOFn id=%d\n", sensor, id);
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ret = PTR_ERR(np);
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goto out_kfree_of_ops;
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}
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trips = thermal_of_trips_init(np, &ntrips);
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if (IS_ERR(trips)) {
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pr_err("Failed to find trip points for %pOFn id=%d\n", sensor, id);
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ret = PTR_ERR(trips);
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goto out_kfree_of_ops;
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}
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ret = thermal_of_monitor_init(np, &delay, &pdelay);
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if (ret) {
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pr_err("Failed to initialize monitoring delays from %pOFn\n", np);
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goto out_kfree_trips;
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}
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thermal_of_parameters_init(np, &tzp);
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of_ops->bind = thermal_of_bind;
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of_ops->unbind = thermal_of_unbind;
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mask = GENMASK_ULL((ntrips) - 1, 0);
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tz = thermal_zone_device_register_with_trips(np->name, trips, ntrips,
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mask, data, of_ops, &tzp,
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pdelay, delay);
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if (IS_ERR(tz)) {
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ret = PTR_ERR(tz);
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pr_err("Failed to register thermal zone %pOFn: %d\n", np, ret);
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goto out_kfree_trips;
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}
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ret = thermal_zone_device_enable(tz);
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if (ret) {
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pr_err("Failed to enabled thermal zone '%s', id=%d: %d\n",
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tz->type, tz->id, ret);
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thermal_of_zone_unregister(tz);
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return ERR_PTR(ret);
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}
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return tz;
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out_kfree_trips:
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kfree(trips);
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out_kfree_of_ops:
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kfree(of_ops);
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return ERR_PTR(ret);
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}
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static void devm_thermal_of_zone_release(struct device *dev, void *res)
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{
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thermal_of_zone_unregister(*(struct thermal_zone_device **)res);
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}
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static int devm_thermal_of_zone_match(struct device *dev, void *res,
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void *data)
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{
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struct thermal_zone_device **r = res;
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if (WARN_ON(!r || !*r))
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return 0;
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return *r == data;
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}
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/**
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* devm_thermal_of_zone_register - register a thermal tied with the sensor life cycle
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*
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* This function is the device version of the thermal_of_zone_register() function.
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*
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* @dev: a device structure pointer to sensor to be tied with the thermal zone OF life cycle
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* @sensor_id: the sensor identifier
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* @data: a pointer to a private data to be stored in the thermal zone 'devdata' field
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* @ops: a pointer to the ops structure associated with the sensor
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*/
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struct thermal_zone_device *devm_thermal_of_zone_register(struct device *dev, int sensor_id, void *data,
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const struct thermal_zone_device_ops *ops)
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{
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struct thermal_zone_device **ptr, *tzd;
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ptr = devres_alloc(devm_thermal_of_zone_release, sizeof(*ptr),
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GFP_KERNEL);
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if (!ptr)
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return ERR_PTR(-ENOMEM);
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|
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tzd = thermal_of_zone_register(dev->of_node, sensor_id, data, ops);
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if (IS_ERR(tzd)) {
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devres_free(ptr);
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return tzd;
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}
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*ptr = tzd;
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devres_add(dev, ptr);
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return tzd;
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}
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EXPORT_SYMBOL_GPL(devm_thermal_of_zone_register);
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/**
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* devm_thermal_of_zone_unregister - Resource managed version of
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* thermal_of_zone_unregister().
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* @dev: Device for which which resource was allocated.
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* @tz: a pointer to struct thermal_zone where the sensor is registered.
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*
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* This function removes the sensor callbacks and private data from the
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* thermal zone device registered with devm_thermal_zone_of_sensor_register()
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|
* API. It will also silent the zone by remove the .get_temp() and .get_trend()
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* thermal zone device callbacks.
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* Normally this function will not need to be called and the resource
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* management code will ensure that the resource is freed.
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|
*/
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void devm_thermal_of_zone_unregister(struct device *dev, struct thermal_zone_device *tz)
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|
{
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|
WARN_ON(devres_release(dev, devm_thermal_of_zone_release,
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|
devm_thermal_of_zone_match, tz));
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|
}
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EXPORT_SYMBOL_GPL(devm_thermal_of_zone_unregister);
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