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Fri, 15 Oct 2021 08:26:27 -0400 (EDT) From: Alistair Francis To: lee.jones@linaro.org, robh+dt@kernel.org, lgirdwood@gmail.com, broonie@kernel.org, kernel@pengutronix.de Cc: shawnguo@kernel.org, s.hauer@pengutronix.de, linux-imx@nxp.com, amitk@kernel.org, rui.zhang@intel.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, alistair23@gmail.com, linux-hwmon@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org, Alistair Francis Subject: [PATCH v13 5/9] thermal: sy7636a: Add thermal driver for sy7636a Date: Fri, 15 Oct 2021 22:25:47 +1000 Message-Id: <20211015122551.38951-6-alistair@alistair23.me> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211015122551.38951-1-alistair@alistair23.me> References: <20211015122551.38951-1-alistair@alistair23.me> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add thermal driver to enable kernel based polling and shutdown of device for temperatures out of spec Signed-off-by: Alistair Francis --- drivers/thermal/Kconfig | 6 ++ drivers/thermal/Makefile | 1 + drivers/thermal/sy7636a_thermal.c | 94 +++++++++++++++++++++++++++++++ 3 files changed, 101 insertions(+) create mode 100644 drivers/thermal/sy7636a_thermal.c diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index d7f44deab5b1..6ee0e7de1b37 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -450,6 +450,12 @@ depends on (ARCH_STI || ARCH_STM32) && OF source "drivers/thermal/st/Kconfig" endmenu +config SY7636A_THERMAL + tristate "SY7636A thermal management" + help + Enable the sy7636a thermal driver, which supports the + temperature sensor embedded in Silabs SY7636A IC. + source "drivers/thermal/tegra/Kconfig" config GENERIC_ADC_THERMAL diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index 82fc3e616e54..2e1aca8a0a09 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -51,6 +51,7 @@ obj-$(CONFIG_DA9062_THERMAL) += da9062-thermal.o obj-y += intel/ obj-$(CONFIG_TI_SOC_THERMAL) += ti-soc-thermal/ obj-y += st/ +obj-$(CONFIG_SY7636A_THERMAL) += sy7636a_thermal.o obj-$(CONFIG_QCOM_TSENS) += qcom/ obj-y += tegra/ obj-$(CONFIG_HISI_THERMAL) += hisi_thermal.o diff --git a/drivers/thermal/sy7636a_thermal.c b/drivers/thermal/sy7636a_thermal.c new file mode 100644 index 000000000000..9e58305ca3ce --- /dev/null +++ b/drivers/thermal/sy7636a_thermal.c @@ -0,0 +1,94 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Functions to access SY3686A power management chip temperature + * + * Copyright (C) 2019 reMarkable AS - http://www.remarkable.com/ + * + * Authors: Lars Ivar Miljeteig + * Alistair Francis + */ + +#include +#include +#include + +#include + +static int sy7636a_get_temp(void *arg, int *res) +{ + unsigned int mode_ctr; + int ret, reg_val; + struct regmap *regmap = arg; + bool isVoltageActive; + + ret = regmap_read(regmap, + SY7636A_REG_OPERATION_MODE_CRL, &mode_ctr); + if (ret) + return ret; + + isVoltageActive = mode_ctr & SY7636A_OPERATION_MODE_CRL_ONOFF; + + /* If operation mode isn't set to control, then let's set it. */ + if (!isVoltageActive) { + ret = regmap_write(regmap, + SY7636A_REG_OPERATION_MODE_CRL, + mode_ctr | SY7636A_OPERATION_MODE_CRL_ONOFF); + if (ret) + return ret; + } + + ret = regmap_read(regmap, + SY7636A_REG_TERMISTOR_READOUT, ®_val); + if (ret) + return ret; + + /* Restore the operation mode if it wasn't set */ + if (!isVoltageActive) { + ret = regmap_write(regmap, + SY7636A_REG_OPERATION_MODE_CRL, + mode_ctr); + if (ret) + return ret; + } + + *res = reg_val * 1000; + + return ret; +} + +static const struct thermal_zone_of_device_ops ops = { + .get_temp = sy7636a_get_temp, +}; + +static int sy7636a_thermal_probe(struct platform_device *pdev) +{ + struct regmap *regmap = dev_get_regmap(pdev->dev.parent, NULL); + struct thermal_zone_device *thermal_zone_dev; + + thermal_zone_dev = devm_thermal_zone_of_sensor_register( + pdev->dev.parent, + 0, + regmap, + &ops); + + return PTR_ERR_OR_ZERO(thermal_zone_dev); +} + +static const struct platform_device_id sy7636a_thermal_id_table[] = { + { "sy7636a-thermal", }, + { } +}; +MODULE_DEVICE_TABLE(platform, sy7636a_thermal_id_table); + +static struct platform_driver sy7636a_thermal_driver = { + .driver = { + .name = "sy7636a-thermal", + }, + .probe = sy7636a_thermal_probe, + .id_table = sy7636a_thermal_id_table, +}; +module_platform_driver(sy7636a_thermal_driver); + +MODULE_AUTHOR("Lars Ivar Miljeteig "); +MODULE_DESCRIPTION("SY7636A thermal driver"); +MODULE_LICENSE("GPL v2"); -- 2.31.1