lkml.org 
[lkml]   [2021]   [Aug]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH v11 05/10] thermal: sy7636a: Add thermal driver for sy7636a
    Date
    Add thermal driver to enable kernel based polling
    and shutdown of device for temperatures out of spec

    Signed-off-by: Alistair Francis <alistair@alistair23.me>
    ---
    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 <lars.ivar.miljeteig@remarkable.com>
    + * Alistair Francis <alistair@alistair23.me>
    + */
    +
    +#include <linux/module.h>
    +#include <linux/platform_device.h>
    +#include <linux/thermal.h>
    +
    +#include <linux/mfd/sy7636a.h>
    +
    +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, &reg_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 <lars.ivar.miljeteig@remarkable.com>");
    +MODULE_DESCRIPTION("SY7636A thermal driver");
    +MODULE_LICENSE("GPL v2");
    --
    2.31.1
    \
     
     \ /
      Last update: 2021-08-19 13:17    [W:4.352 / U:0.180 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site