From: Alistair Francis <alistair@alistair23.me>
To: lee.jones@linaro.org, robh+dt@kernel.org, lgirdwood@gmail.com,
broonie@kernel.org, kernel@pengutronix.de
Cc: shawnguo@kernel.org, s.hauer@pengutronix.de, linux-imx@nxp.com,
amitk@kernel.org, rui.zhang@intel.com,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
alistair23@gmail.com, linux-hwmon@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org,
Alistair Francis <alistair@alistair23.me>
Subject: [PATCH v13 6/9] hwmon: sy7636a: Add temperature driver for sy7636a
Date: Fri, 15 Oct 2021 22:25:48 +1000 [thread overview]
Message-ID: <20211015122551.38951-7-alistair@alistair23.me> (raw)
In-Reply-To: <20211015122551.38951-1-alistair@alistair23.me>
This is a multi-function device to interface with the sy7636a
EPD PMIC chip from Silergy.
Signed-off-by: Alistair Francis <alistair@alistair23.me>
---
Documentation/hwmon/sy7636a-hwmon.rst | 24 +++++++++
drivers/hwmon/Kconfig | 9 ++++
drivers/hwmon/Makefile | 1 +
drivers/hwmon/sy7636a-hwmon.c | 75 +++++++++++++++++++++++++++
4 files changed, 109 insertions(+)
create mode 100644 Documentation/hwmon/sy7636a-hwmon.rst
create mode 100644 drivers/hwmon/sy7636a-hwmon.c
diff --git a/Documentation/hwmon/sy7636a-hwmon.rst b/Documentation/hwmon/sy7636a-hwmon.rst
new file mode 100644
index 000000000000..6b3e36d028dd
--- /dev/null
+++ b/Documentation/hwmon/sy7636a-hwmon.rst
@@ -0,0 +1,24 @@
+Kernel driver sy7636a-hwmon
+=========================
+
+Supported chips:
+
+ * Silergy SY7636A PMIC
+
+
+Description
+-----------
+
+This driver adds hardware temperature reading support for
+the Silergy SY7636A PMIC.
+
+The following sensors are supported
+
+ * Temperature
+ - SoC on-die temperature in milli-degree C
+
+sysfs-Interface
+---------------
+
+temp0_input
+ - SoC on-die temperature (milli-degree C)
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index c4578e8f34bb..d768b833b721 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1651,6 +1651,15 @@ 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"
+ 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 162940270661..1355ffdb1481 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -181,6 +181,7 @@ 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..a59628f87ff3
--- /dev/null
+++ b/drivers/hwmon/sy7636a-hwmon.c
@@ -0,0 +1,75 @@
+// 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/err.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/sysfs.h>
+#include <linux/platform_device.h>
+
+#include <linux/mfd/sy7636a.h>
+
+static ssize_t show_temp(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ unsigned int reg_val;
+ struct regmap *regmap = dev_get_drvdata(dev);
+ int ret;
+
+ ret = regmap_read(regmap, SY7636A_REG_TERMISTOR_READOUT, ®_val);
+ if (ret)
+ return ret;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", reg_val);
+}
+
+static SENSOR_DEVICE_ATTR(temp0, 0444, 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 regmap *regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ struct device *hwmon_dev;
+ int err;
+
+ if (!regmap)
+ return -EPROBE_DEFER;
+
+ hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev,
+ "sy7636a_temperature", regmap, NULL, sy7636a_groups);
+
+ if (IS_ERR(hwmon_dev)) {
+ err = PTR_ERR(hwmon_dev);
+ dev_err(&pdev->dev, "Unable to register hwmon device, returned %d\n", err);
+ return err;
+ }
+
+ return 0;
+}
+
+static struct platform_driver sy7636a_sensor_driver = {
+ .probe = sy7636a_sensor_probe,
+ .driver = {
+ .name = "sy7636a-temperature",
+ },
+};
+module_platform_driver(sy7636a_sensor_driver);
+
+MODULE_DESCRIPTION("SY7636A sensor driver");
+MODULE_LICENSE("GPL");
--
2.31.1
next prev parent reply other threads:[~2021-10-15 12:27 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-15 12:25 [PATCH v13 0/9] Add support for the silergy,sy7636a Alistair Francis
2021-10-15 12:25 ` [PATCH v13 1/9] dt-bindings: mfd: Initial commit of silergy,sy7636a.yaml Alistair Francis
2021-10-22 10:30 ` Lee Jones
2021-10-15 12:25 ` [PATCH v13 2/9] mfd: simple-mfd-i2c: Add a Kconfig name Alistair Francis
2021-10-22 10:30 ` Lee Jones
2021-10-15 12:25 ` [PATCH v13 3/9] mfd: simple-mfd-i2c: Enable support for the silergy,sy7636a Alistair Francis
2021-10-21 11:27 ` Lee Jones
2021-10-15 12:25 ` [PATCH v13 4/9] regulator: sy7636a: Remove requirement on sy7636a mfd Alistair Francis
2021-10-15 12:25 ` [PATCH v13 5/9] thermal: sy7636a: Add thermal driver for sy7636a Alistair Francis
2021-10-16 10:32 ` Daniel Lezcano
2021-10-15 12:25 ` Alistair Francis [this message]
2021-10-15 14:12 ` [PATCH v13 6/9] hwmon: sy7636a: Add temperature " Guenter Roeck
2021-10-15 12:25 ` [PATCH v13 7/9] ARM: imx_v6_v7_defconfig: Enable silergy,sy7636a Alistair Francis
2021-10-15 12:25 ` [PATCH v13 8/9] ARM: dts: imx7d: remarkable2: " Alistair Francis
2021-10-15 12:25 ` [PATCH v13 9/9] ARM: dts: imx7d: remarkable2: Enable lcdif Alistair Francis
2021-10-22 0:52 ` (subset) [PATCH v13 0/9] Add support for the silergy,sy7636a Mark Brown
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