// SPDX-License-Identifier: GPL-2.0-only /* * OMAP thermal driver interface * * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/ * Contact: * Eduardo Valentin */ #include #include #include #include #include #include #include #include #include #include #include #include "ti-thermal.h" #include "ti-bandgap.h" #include "../thermal_hwmon.h" #define TI_BANDGAP_UPDATE_INTERVAL_MS 250 /* common data structures */ struct ti_thermal_data { struct cpufreq_policy *policy; struct thermal_zone_device *ti_thermal; struct thermal_zone_device *pcb_tz; struct thermal_cooling_device *cool_dev; struct ti_bandgap *bgp; enum thermal_device_mode mode; struct work_struct thermal_wq; int sensor_id; bool our_zone; }; static void ti_thermal_work(struct work_struct *work) { struct ti_thermal_data *data = container_of(work, struct ti_thermal_data, thermal_wq); thermal_zone_device_update(data->ti_thermal, THERMAL_EVENT_UNSPECIFIED); dev_dbg(data->bgp->dev, "updated thermal zone %s\n", thermal_zone_device_type(data->ti_thermal)); } /** * ti_thermal_hotspot_temperature - returns sensor extrapolated temperature * @t: omap sensor temperature * @s: omap sensor slope value * @c: omap sensor const value */ static inline int ti_thermal_hotspot_temperature(int t, int s, int c) { int delta = t * s / 1000 + c; if (delta < 0) delta = 0; return t + delta; } /* thermal zone ops */ /* Get temperature callback function for thermal zone */ static inline int __ti_thermal_get_temp(struct thermal_zone_device *tz, int *temp) { struct thermal_zone_device *pcb_tz = NULL; struct ti_thermal_data *data = thermal_zone_device_priv(tz); struct ti_bandgap *bgp; const struct ti_temp_sensor *s; int ret, tmp, slope, constant; int pcb_temp; if (!data) return 0; bgp = data->bgp; s = &bgp->conf->sensors[data->sensor_id]; ret = ti_bandgap_read_temperature(bgp, data->sensor_id, &tmp); if (ret) return ret; /* Default constants */ slope = thermal_zone_get_slope(tz); constant = thermal_zone_get_offset(tz); pcb_tz = data->pcb_tz; /* In case pcb zone is available, use the extrapolation rule with it */ if (!IS_ERR(pcb_tz)) { ret = thermal_zone_get_temp(pcb_tz, &pcb_temp); if (!ret) { tmp -= pcb_temp; /* got a valid PCB temp */ slope = s->slope_pcb; constant = s->constant_pcb; } else { dev_err(bgp->dev, "Failed to read PCB state. Using defaults\n"); ret = 0; } } *temp = ti_thermal_hotspot_temperature(tmp, slope, constant); return ret; } static int __ti_thermal_get_trend(struct thermal_zone_device *tz, int trip, enum thermal_trend *trend) { struct ti_thermal_data *data = thermal_zone_device_priv(tz); struct ti_bandgap *bgp; int id, tr, ret = 0; bgp = data->bgp; id = data->sensor_id; ret = ti_bandgap_get_trend(bgp, id, &tr); if (ret) return ret; if (tr > 0) *trend = THERMAL_TREND_RAISING; else if (tr < 0) *trend = THERMAL_TREND_DROPPING; else *trend = THERMAL_TREND_STABLE; return 0; } static const struct thermal_zone_device_ops ti_of_thermal_ops = { .get_temp = __ti_thermal_get_temp, .get_trend = __ti_thermal_get_trend, }; static struct ti_thermal_data *ti_thermal_build_data(struct ti_bandgap *bgp, int id) { struct ti_thermal_data *data; data = devm_kzalloc(bgp->dev, sizeof(*data), GFP_KERNEL); if (!data) { dev_err(bgp->dev, "kzalloc fail\n"); return NULL; } data->sensor_id = id; data->bgp = bgp; data->mode = THERMAL_DEVICE_ENABLED; /* pcb_tz will be either valid or PTR_ERR() */ data->pcb_tz = thermal_zone_get_zone_by_name("pcb"); INIT_WORK(&data->thermal_wq, ti_thermal_work); return data; } int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id, char *domain) { struct ti_thermal_data *data; data = ti_bandgap_get_sensor_data(bgp, id); if (IS_ERR_OR_NULL(data)) data = ti_thermal_build_data(bgp, id); if (!data) return -EINVAL; /* in case this is specified by DT */ data->ti_thermal = devm_thermal_of_zone_register(bgp->dev, id, data, &ti_of_thermal_ops); if (IS_ERR(data->ti_thermal)) { dev_err(bgp->dev, "thermal zone device is NULL\n"); return PTR_ERR(data->ti_thermal); } ti_bandgap_set_sensor_data(bgp, id, data); ti_bandgap_write_update_interval(bgp, data->sensor_id, TI_BANDGAP_UPDATE_INTERVAL_MS); if (devm_thermal_add_hwmon_sysfs(bgp->dev, data->ti_thermal)) dev_warn(bgp->dev, "failed to add hwmon sysfs attributes\n"); return 0; } int ti_thermal_remove_sensor(struct ti_bandgap *bgp, int id) { struct ti_thermal_data *data; data = ti_bandgap_get_sensor_data(bgp, id); if (!IS_ERR_OR_NULL(data) && data->ti_thermal) { if (data->our_zone) thermal_zone_device_unregister(data->ti_thermal); } return 0; } int ti_thermal_report_sensor_temperature(struct ti_bandgap *bgp, int id) { struct ti_thermal_data *data; data = ti_bandgap_get_sensor_data(bgp, id); schedule_work(&data->thermal_wq); return 0; } int ti_thermal_register_cpu_cooling(struct ti_bandgap *bgp, int id) { struct ti_thermal_data *data; struct device_node *np = bgp->dev->of_node; /* * We are assuming here that if one deploys the zone * using DT, then it must be aware that the cooling device * loading has to happen via cpufreq driver. */ if (of_property_present(np, "#thermal-sensor-cells")) return 0; data = ti_bandgap_get_sensor_data(bgp, id); if (!data || IS_ERR(data)) data = ti_thermal_build_data(bgp, id); if (!data) return -EINVAL; data->policy = cpufreq_cpu_get(0); if (!data->policy) { pr_debug("%s: CPUFreq policy not found\n", __func__); return -EPROBE_DEFER; } /* Register cooling device */ data->cool_dev = cpufreq_cooling_register(data->policy); if (IS_ERR(data->cool_dev)) { int ret = PTR_ERR(data->cool_dev); dev_err(bgp->dev, "Failed to register cpu cooling device %d\n", ret); cpufreq_cpu_put(data->policy); return ret; } ti_bandgap_set_sensor_data(bgp, id, data); return 0; } int ti_thermal_unregister_cpu_cooling(struct ti_bandgap *bgp, int id) { struct ti_thermal_data *data; data = ti_bandgap_get_sensor_data(bgp, id); if (!IS_ERR_OR_NULL(data)) { cpufreq_cooling_unregister(data->cool_dev); if (data->policy) cpufreq_cpu_put(data->policy); } return 0; }