This is a multi-function device to interface with the sy7636a EPD PMIC chip from Silergy. Signed-off-by: Alistair Francis <alistair@xxxxxxxxxxxxx> --- arch/arm/configs/imx_v6_v7_defconfig | 1 + drivers/hwmon/Kconfig | 10 +++ drivers/hwmon/Makefile | 1 + drivers/hwmon/sy7636a-hwmon.c | 106 +++++++++++++++++++++++++++ 4 files changed, 118 insertions(+) create mode 100644 drivers/hwmon/sy7636a-hwmon.c diff --git a/arch/arm/configs/imx_v6_v7_defconfig b/arch/arm/configs/imx_v6_v7_defconfig index cd80e85d37cf..e9c0be5629c6 100644 --- a/arch/arm/configs/imx_v6_v7_defconfig +++ b/arch/arm/configs/imx_v6_v7_defconfig @@ -227,6 +227,7 @@ CONFIG_RN5T618_POWER=m CONFIG_SENSORS_MC13783_ADC=y CONFIG_SENSORS_GPIO_FAN=y CONFIG_SENSORS_IIO_HWMON=y +CONFIG_SENSORS_SY7636A=y CONFIG_THERMAL_STATISTICS=y CONFIG_THERMAL_WRITABLE_TRIPS=y CONFIG_CPU_THERMAL=y diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index e3675377bc5d..6cae12de59cd 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -1631,6 +1631,16 @@ config SENSORS_SIS5595 This driver can also be built as a module. If so, the module will be called sis5595. +config SENSORS_SY7636A + tristate "Silergy SY7636A" + depends on I2C + help + If you say yes here you get support for the thermistor readout of + the Silergy SY7636A PMIC. + + This driver can also be built as a module. If so, the module + will be called sy7636a-hwmon. + config SENSORS_DME1737 tristate "SMSC DME1737, SCH311x and compatibles" depends on I2C && !PPC diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index d712c61c1f5e..8b2e09e25b24 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -180,6 +180,7 @@ obj-$(CONFIG_SENSORS_SMSC47M1) += smsc47m1.o obj-$(CONFIG_SENSORS_SMSC47M192)+= smsc47m192.o obj-$(CONFIG_SENSORS_SPARX5) += sparx5-temp.o obj-$(CONFIG_SENSORS_STTS751) += stts751.o +obj-$(CONFIG_SENSORS_SY7636A) += sy7636a-hwmon.o obj-$(CONFIG_SENSORS_AMC6821) += amc6821.o obj-$(CONFIG_SENSORS_TC74) += tc74.o obj-$(CONFIG_SENSORS_THMC50) += thmc50.o diff --git a/drivers/hwmon/sy7636a-hwmon.c b/drivers/hwmon/sy7636a-hwmon.c new file mode 100644 index 000000000000..4edbee99b693 --- /dev/null +++ b/drivers/hwmon/sy7636a-hwmon.c @@ -0,0 +1,106 @@ +/* + * Functions to access SY3686A power management chip temperature + * + * Copyright (C) 2019 reMarkable AS - http://www.remarkable.com/ + * + * Author: Lars Ivar Miljeteig <lars.ivar.miljeteig@xxxxxxxxxxxxxx> + * + * 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 version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/jiffies.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/err.h> +#include <linux/sysfs.h> +#include <linux/platform_device.h> + +#include <linux/mfd/sy7636a.h> + +struct sy7636a_data { + struct sy7636a *sy7636a; + struct device *hwmon_dev; +}; + +static ssize_t show_temp(struct device *dev, + struct device_attribute *attr, char *buf) +{ + unsigned int reg_val; + signed char temp; + int ret; + struct sy7636a_data *data = dev_get_drvdata(dev); + + ret = regmap_read(data->sy7636a->regmap, + SY7636A_REG_TERMISTOR_READOUT, ®_val); + if (ret) + return ret; + + temp = *((signed char*)®_val); + + return snprintf(buf, PAGE_SIZE, "%d\n", temp); +} + +static SENSOR_DEVICE_ATTR(temp0, S_IRUGO, show_temp, NULL, 0); + +static struct attribute *sy7636a_attrs[] = { + &sensor_dev_attr_temp0.dev_attr.attr, + NULL +}; + +ATTRIBUTE_GROUPS(sy7636a); + +static int sy7636a_sensor_probe(struct platform_device *pdev) +{ + struct sy7636a *sy7636a = dev_get_drvdata(pdev->dev.parent); + struct sy7636a_data *data; + int err; + + if (!sy7636a) + return -EPROBE_DEFER; + + data = devm_kzalloc(&pdev->dev, sizeof(struct sy7636a_data), GFP_KERNEL); + if (!data) { + return -ENOMEM; + } + + data->sy7636a = sy7636a; + data->hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, + "sy7636a_temperature", data, sy7636a_groups); + if (IS_ERR(data->hwmon_dev)) { + err = PTR_ERR(data->hwmon_dev); + dev_err(&pdev->dev, "Unable to register hwmon device, returned %d", err); + return err; + } + + return 0; +} + +static const struct platform_device_id sy7636a_sensor_id[] = { + { "sy7636a-temperature", 0}, + { }, +}; +MODULE_DEVICE_TABLE(platform, sy7636a_sensor_id); + +static struct platform_driver sy7636a_sensor_driver = { + .probe = sy7636a_sensor_probe, + .id_table = sy7636a_sensor_id, + .driver = { + .name = "sy7636a-temperature", + }, +}; +module_platform_driver(sy7636a_sensor_driver); + +MODULE_DESCRIPTION("SY7636A sensor driver"); +MODULE_LICENSE("GPL"); + -- 2.31.1
