// SPDX-License-Identifier: GPL-2.0+ /* * Driver for Broadcom BCM2835 SoC temperature sensor * * Copyright (C) 2016 Martin Sperl */ #include <linux/clk.h> #include <linux/debugfs.h> #include <linux/device.h> #include <linux/err.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/of_device.h> #include <linux/platform_device.h> #include <linux/thermal.h> #include "../thermal_hwmon.h" #define BCM2835_TS_TSENSCTL … #define BCM2835_TS_TSENSSTAT … #define BCM2835_TS_TSENSCTL_PRWDW … #define BCM2835_TS_TSENSCTL_RSTB … /* * bandgap reference voltage in 6 mV increments * 000b = 1178 mV, 001b = 1184 mV, ... 111b = 1220 mV */ #define BCM2835_TS_TSENSCTL_CTRL_BITS … #define BCM2835_TS_TSENSCTL_CTRL_SHIFT … #define BCM2835_TS_TSENSCTL_CTRL_MASK … #define BCM2835_TS_TSENSCTL_CTRL_DEFAULT … #define BCM2835_TS_TSENSCTL_EN_INT … #define BCM2835_TS_TSENSCTL_DIRECT … #define BCM2835_TS_TSENSCTL_CLR_INT … #define BCM2835_TS_TSENSCTL_THOLD_SHIFT … #define BCM2835_TS_TSENSCTL_THOLD_BITS … #define BCM2835_TS_TSENSCTL_THOLD_MASK … /* * time how long the block to be asserted in reset * which based on a clock counter (TSENS clock assumed) */ #define BCM2835_TS_TSENSCTL_RSTDELAY_SHIFT … #define BCM2835_TS_TSENSCTL_RSTDELAY_BITS … #define BCM2835_TS_TSENSCTL_REGULEN … #define BCM2835_TS_TSENSSTAT_DATA_BITS … #define BCM2835_TS_TSENSSTAT_DATA_SHIFT … #define BCM2835_TS_TSENSSTAT_DATA_MASK … #define BCM2835_TS_TSENSSTAT_VALID … #define BCM2835_TS_TSENSSTAT_INTERRUPT … struct bcm2835_thermal_data { … }; static int bcm2835_thermal_adc2temp(u32 adc, int offset, int slope) { … } static int bcm2835_thermal_temp2adc(int temp, int offset, int slope) { … } static int bcm2835_thermal_get_temp(struct thermal_zone_device *tz, int *temp) { … } static const struct debugfs_reg32 bcm2835_thermal_regs[] = …; static void bcm2835_thermal_debugfs(struct platform_device *pdev) { … } static const struct thermal_zone_device_ops bcm2835_thermal_ops = …; /* * Note: as per Raspberry Foundation FAQ * (https://www.raspberrypi.org/help/faqs/#performanceOperatingTemperature) * the recommended temperature range for the SoC -40C to +85C * so the trip limit is set to 80C. * this applies to all the BCM283X SoC */ static const struct of_device_id bcm2835_thermal_of_match_table[] = …; MODULE_DEVICE_TABLE(of, bcm2835_thermal_of_match_table); static int bcm2835_thermal_probe(struct platform_device *pdev) { … } static void bcm2835_thermal_remove(struct platform_device *pdev) { … } static struct platform_driver bcm2835_thermal_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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