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Message-Id: <20210708115804.212-3-alistair@alistair23.me>
Date: Thu, 8 Jul 2021 21:58:01 +1000
From: Alistair Francis <alistair@...stair23.me>
To: lee.jones@...aro.org, robh+dt@...nel.org, lgirdwood@...il.com,
broonie@...nel.org, linux-imx@....com, kernel@...gutronix.de
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
alistair23@...il.com, Alistair Francis <alistair@...stair23.me>
Subject: [PATCH v7 3/6] hwmon: sy7636a: Add temperature driver for sy7636a
This is a multi-function device to interface with the sy7636a
EPD PMIC chip from Silergy.
Signed-off-by: Alistair Francis <alistair@...stair23.me>
---
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@...arkable.com>
+ *
+ * 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
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