hwmon: (ltq-cputemp) add cpu temp sensor driver (7074d0a9) · Commits · e / devices / android_kernel_oneplus_sm7250

drivers/hwmon/Kconfig

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Original line number	Diff line number	Diff line
		@@ -791,6 +791,13 @@ config SENSORS_LTC4261
		This driver can also be built as a module. If so, the module will
		be called ltc4261.

		config SENSORS_LTQ_CPUTEMP
		bool "Lantiq cpu temperature sensor driver"
		depends on LANTIQ
		help
		If you say yes here you get support for the temperature
		sensor inside your CPU.

		config SENSORS_MAX1111
		tristate "Maxim MAX1111 Serial 8-bit ADC chip and compatibles"
		depends on SPI_MASTER

drivers/hwmon/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -110,6 +110,7 @@ obj-$(CONFIG_SENSORS_LTC4222) += ltc4222.o
		obj-$(CONFIG_SENSORS_LTC4245) += ltc4245.o
		obj-$(CONFIG_SENSORS_LTC4260) += ltc4260.o
		obj-$(CONFIG_SENSORS_LTC4261) += ltc4261.o
		obj-$(CONFIG_SENSORS_LTQ_CPUTEMP) += ltq-cputemp.o
		obj-$(CONFIG_SENSORS_MAX1111) += max1111.o
		obj-$(CONFIG_SENSORS_MAX16065) += max16065.o
		obj-$(CONFIG_SENSORS_MAX1619) += max1619.o

drivers/hwmon/ltq-cputemp.c

0 → 100644

+163 −0

Original line number	Diff line number	Diff line
		/* Lantiq cpu temperature sensor driver
		*
		* Copyright (C) 2017 Florian Eckert <fe@dev.tdt.de>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or
		* (at your option) any later version
		*
		* This program is distributed in the hope that it will be useful
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, see <http://www.gnu.org/licenses/>
		*/

		#include <linux/bitops.h>
		#include <linux/delay.h>
		#include <linux/hwmon.h>
		#include <linux/hwmon-sysfs.h>
		#include <linux/init.h>
		#include <linux/module.h>
		#include <linux/of_device.h>

		#include <lantiq_soc.h>

		/* gphy1 configuration register contains cpu temperature */
		#define CGU_GPHY1_CR 0x0040
		#define CGU_TEMP_PD BIT(19)

		static void ltq_cputemp_enable(void)
		{
		ltq_cgu_w32(ltq_cgu_r32(CGU_GPHY1_CR) \| CGU_TEMP_PD, CGU_GPHY1_CR);
		}

		static void ltq_cputemp_disable(void *data)
		{
		ltq_cgu_w32(ltq_cgu_r32(CGU_GPHY1_CR) & ~CGU_TEMP_PD, CGU_GPHY1_CR);
		}

		static int ltq_read(struct device *dev, enum hwmon_sensor_types type,
		u32 attr, int channel, long *temp)
		{
		int value;

		switch (attr) {
		case hwmon_temp_input:
		/* get the temperature including one decimal place */
		value = (ltq_cgu_r32(CGU_GPHY1_CR) >> 9) & 0x01FF;
		value = value * 5;
		/* range -38 to +154 °C, register value zero is -38.0 °C */
		value -= 380;
		/* scale temp to millidegree */
		value = value * 100;
		break;
		default:
		return -EOPNOTSUPP;
		}

		*temp = value;
		return 0;
		}

		static umode_t ltq_is_visible(const void *_data, enum hwmon_sensor_types type,
		u32 attr, int channel)
		{
		if (type != hwmon_temp)
		return 0;

		switch (attr) {
		case hwmon_temp_input:
		return 0444;
		default:
		return 0;
		}
		}

		static const u32 ltq_chip_config[] = {
		HWMON_C_REGISTER_TZ,
		0
		};

		static const struct hwmon_channel_info ltq_chip = {
		.type = hwmon_chip,
		.config = ltq_chip_config,
		};

		static const u32 ltq_temp_config[] = {
		HWMON_T_INPUT,
		0
		};

		static const struct hwmon_channel_info ltq_temp = {
		.type = hwmon_temp,
		.config = ltq_temp_config,
		};

		static const struct hwmon_channel_info *ltq_info[] = {
		&ltq_chip,
		&ltq_temp,
		NULL
		};

		static const struct hwmon_ops ltq_hwmon_ops = {
		.is_visible = ltq_is_visible,
		.read = ltq_read,
		};

		static const struct hwmon_chip_info ltq_chip_info = {
		.ops = &ltq_hwmon_ops,
		.info = ltq_info,
		};

		static int ltq_cputemp_probe(struct platform_device *pdev)
		{
		struct device *hwmon_dev;
		int err = 0;

		/* available on vr9 v1.2 SoCs only */
		if (ltq_soc_type() != SOC_TYPE_VR9_2)
		return -ENODEV;

		err = devm_add_action(&pdev->dev, ltq_cputemp_disable, NULL);
		if (err)
		return err;

		ltq_cputemp_enable();

		hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev,
		"ltq_cputemp",
		NULL,
		&ltq_chip_info,
		NULL);

		if (IS_ERR(hwmon_dev)) {
		dev_err(&pdev->dev, "Failed to register as hwmon device");
		return PTR_ERR(hwmon_dev);
		}

		return 0;
		}

		const struct of_device_id ltq_cputemp_match[] = {
		{ .compatible = "lantiq,cputemp" },
		{},
		};
		MODULE_DEVICE_TABLE(of, ltq_cputemp_match);

		static struct platform_driver ltq_cputemp_driver = {
		.probe = ltq_cputemp_probe,
		.driver = {
		.name = "ltq-cputemp",
		.of_match_table = ltq_cputemp_match,
		},
		};

		module_platform_driver(ltq_cputemp_driver);

		MODULE_AUTHOR("Florian Eckert <fe@dev.tdt.de>");
		MODULE_DESCRIPTION("Lantiq cpu temperature sensor driver");
		MODULE_LICENSE("GPL");