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Thu, 8 Jul 2021 07:58:17 -0400 (EDT) From: Alistair Francis To: lee.jones@linaro.org, robh+dt@kernel.org, lgirdwood@gmail.com, broonie@kernel.org, linux-imx@nxp.com, kernel@pengutronix.de Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, alistair23@gmail.com, Lars Ivar Miljeteig , Alistair Francis Subject: [PATCH v7 2/6] thermal: sy7636a: Add thermal driver for sy7636a Date: Thu, 8 Jul 2021 21:58:00 +1000 Message-Id: <20210708115804.212-2-alistair@alistair23.me> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210708115804.212-1-alistair@alistair23.me> References: <20210708115804.212-1-alistair@alistair23.me> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: Lars Ivar Miljeteig 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 | 7 ++ drivers/thermal/Makefile | 1 + drivers/thermal/sy7636a_thermal.c | 107 ++++++++++++++++++++++++++++++ 3 files changed, 115 insertions(+) create mode 100644 drivers/thermal/sy7636a_thermal.c -- 2.31.1 diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index d7f44deab5b1..7112c63d9021 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -450,6 +450,13 @@ depends on (ARCH_STI || ARCH_STM32) && OF source "drivers/thermal/st/Kconfig" endmenu +config SY7636A_THERMAL + tristate "SY7636A thermal management" + depends on MFD_SY7636A + help + Enable the sy7636a thermal driver, which supports the + temperature sensor embedded in Silabs SY7636A chip. + 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..705a16fb1045 --- /dev/null +++ b/drivers/thermal/sy7636a_thermal.c @@ -0,0 +1,107 @@ +// 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 + +struct sy7636a_data { + struct sy7636a *sy7636a; + struct thermal_zone_device *thermal_zone_dev; +}; + +static int sy7636a_get_temp(void *arg, int *res) +{ + unsigned int reg_val, mode_ctr; + int ret; + struct sy7636a_data *data = arg; + bool isVoltageActive; + + ret = regmap_read(data->sy7636a->regmap, + SY7636A_REG_OPERATION_MODE_CRL, &mode_ctr); + if (ret) + return ret; + + isVoltageActive = mode_ctr & SY7636A_OPERATION_MODE_CRL_ONOFF; + + if (!isVoltageActive) { + ret = regmap_write(data->sy7636a->regmap, + SY7636A_REG_OPERATION_MODE_CRL, + mode_ctr | SY7636A_OPERATION_MODE_CRL_ONOFF); + if (ret) + return ret; + } + + ret = regmap_read(data->sy7636a->regmap, + SY7636A_REG_TERMISTOR_READOUT, ®_val); + if (ret) + return ret; + + if (!isVoltageActive) { + ret = regmap_write(data->sy7636a->regmap, + SY7636A_REG_OPERATION_MODE_CRL, + mode_ctr); + if (ret) + return ret; + } + + *res = *((signed char*)®_val); + *res *= 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 sy7636a *sy7636a = dev_get_drvdata(pdev->dev.parent); + struct sy7636a_data *data; + + if (!sy7636a) + return -EPROBE_DEFER; + + data = devm_kzalloc(&pdev->dev, sizeof(struct sy7636a_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + platform_set_drvdata(pdev, data); + + data->sy7636a = sy7636a; + data->thermal_zone_dev = devm_thermal_zone_of_sensor_register( + pdev->dev.parent, + 0, + data, + &ops); + + return PTR_ERR_OR_ZERO(data->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");