On Thu, 08 Jul 2021, Alistair Francis wrote: > 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. The long form isn't usually accepted anymore. Please replace with SPDX. > + */ > + > + > +#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); Whoa! What's going on here? You also need to run checkpatch.pl. > + 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); Where is this used, outside of this function? Not sure I see a good reason for having it around? > + if (!data) { > + return -ENOMEM; > + } > + > + data->sy7636a = sy7636a; > + data->hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, Why is this being stored into a struct? > + "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, What does this do? Where is the 'device' being registered? > + .driver = { > + .name = "sy7636a-temperature", > + }, > +}; > +module_platform_driver(sy7636a_sensor_driver); > + > +MODULE_DESCRIPTION("SY7636A sensor driver"); > +MODULE_LICENSE("GPL"); > + -- Lee Jones [李琼斯] Senior Technical Lead - Developer Services Linaro.org │ Open source software for Arm SoCs Follow Linaro: Facebook | Twitter | Blog
