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From:   Jisheng Zhang <Jisheng.Zhang@synaptics.com>
To:     Jean Delvare <jdelvare@suse.com>,
        Guenter Roeck <linux@roeck-us.net>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>
CC:     "linux-hwmon@vger.kernel.org" <linux-hwmon@vger.kernel.org>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: [PATCH 1/2] hwmon: Add Synaptics AS370 PVT sensor driver
Thread-Topic: [PATCH 1/2] hwmon: Add Synaptics AS370 PVT sensor driver
Thread-Index: AQHVW/VDhzRa9WH15EyS2WUdGKipxA==
Date:   Mon, 26 Aug 2019 10:01:43 +0000
Message-ID: <20190826175029.433632f6@xhacker.debian>
References: <20190826174942.2b28ff05@xhacker.debian>
In-Reply-To: <20190826174942.2b28ff05@xhacker.debian>
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Add a new driver for Synaptics AS370 PVT sensors. Currently, only
temperature is supported.

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
---
 drivers/hwmon/Kconfig       |  10 +++
 drivers/hwmon/Makefile      |   1 +
 drivers/hwmon/as370-hwmon.c | 158 ++++++++++++++++++++++++++++++++++++
 3 files changed, 169 insertions(+)
 create mode 100644 drivers/hwmon/as370-hwmon.c

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 650dd71f9724..d31610933faa 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -246,6 +246,16 @@ config SENSORS_ADT7475
 	  This driver can also be built as a module. If so, the module
 	  will be called adt7475.
=20
+config SENSORS_AS370
+	tristate "Synaptics AS370 SoC hardware monitoring driver"
+	help
+	  If you say yes here you get support for the PVT sensors of
+	  the Synaptics AS370 SoC
+
+	  This driver can also be built as a module. If so, the module
+	  will be called as370-hwmon.
+
+
 config SENSORS_ASC7621
 	tristate "Andigilog aSC7621"
 	depends on I2C
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 8db472ea04f0..252e8a4c9781 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -48,6 +48,7 @@ obj-$(CONFIG_SENSORS_ADT7475)	+=3D adt7475.o
 obj-$(CONFIG_SENSORS_APPLESMC)	+=3D applesmc.o
 obj-$(CONFIG_SENSORS_ARM_SCMI)	+=3D scmi-hwmon.o
 obj-$(CONFIG_SENSORS_ARM_SCPI)	+=3D scpi-hwmon.o
+obj-$(CONFIG_SENSORS_AS370)	+=3D as370-hwmon.o
 obj-$(CONFIG_SENSORS_ASC7621)	+=3D asc7621.o
 obj-$(CONFIG_SENSORS_ASPEED)	+=3D aspeed-pwm-tacho.o
 obj-$(CONFIG_SENSORS_ATXP1)	+=3D atxp1.o
diff --git a/drivers/hwmon/as370-hwmon.c b/drivers/hwmon/as370-hwmon.c
new file mode 100644
index 000000000000..98dfba45e1b0
--- /dev/null
+++ b/drivers/hwmon/as370-hwmon.c
@@ -0,0 +1,158 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Synaptics AS370 SoC Hardware Monitoring Driver
+ *
+ * Copyright (C) 2018 Synaptics Incorporated
+ * Author: Jisheng Zhang <jszhang@kernel.org>
+ */
+
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/hwmon.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+
+#define CTRL		0x0
+#define  PD		BIT(0)
+#define  EN		BIT(1)
+#define  T_SEL		BIT(2)
+#define  V_SEL		BIT(3)
+#define  NMOS_SEL	BIT(8)
+#define  PMOS_SEL	BIT(9)
+#define STS		0x4
+#define  BN_MASK	(0xfff << 0)
+#define  EOC		BIT(12)
+
+struct as370_hwmon {
+	void __iomem *base;
+};
+
+static void init_pvt(struct as370_hwmon *hwmon)
+{
+	u32 val;
+	void __iomem *addr =3D hwmon->base + CTRL;
+
+	val =3D PD;
+	writel_relaxed(val, addr);
+	val |=3D T_SEL;
+	val &=3D ~V_SEL;
+	val &=3D ~NMOS_SEL;
+	val &=3D ~PMOS_SEL;
+	writel_relaxed(val, addr);
+	val |=3D EN;
+	writel_relaxed(val, addr);
+	val &=3D ~PD;
+	writel_relaxed(val, addr);
+}
+
+static int read_pvt(struct as370_hwmon *hwmon)
+{
+	return readl_relaxed(hwmon->base + STS) & BN_MASK;
+}
+
+static int as370_hwmon_read(struct device *dev, enum hwmon_sensor_types ty=
pe,
+			    u32 attr, int channel, long *temp)
+{
+	int val;
+	struct as370_hwmon *hwmon =3D dev_get_drvdata(dev);
+
+	switch (attr) {
+	case hwmon_temp_input:
+		val =3D read_pvt(hwmon);
+		if (val < 0)
+			return val;
+		*temp =3D val * 251802 / 4096 - 85525;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+static umode_t
+as370_hwmon_is_visible(const void *data, enum hwmon_sensor_types type,
+		       u32 attr, int channel)
+{
+	if (type !=3D hwmon_temp)
+		return 0;
+
+	switch (attr) {
+	case hwmon_temp_input:
+		return 0444;
+	default:
+		return 0;
+	}
+}
+
+static const u32 as370_hwmon_temp_config[] =3D {
+	HWMON_T_INPUT,
+	0
+};
+
+static const struct hwmon_channel_info as370_hwmon_temp =3D {
+	.type =3D hwmon_temp,
+	.config =3D as370_hwmon_temp_config,
+};
+
+static const struct hwmon_channel_info *as370_hwmon_info[] =3D {
+	&as370_hwmon_temp,
+	NULL
+};
+
+static const struct hwmon_ops as370_hwmon_ops =3D {
+	.is_visible =3D as370_hwmon_is_visible,
+	.read =3D as370_hwmon_read,
+};
+
+static const struct hwmon_chip_info as370_chip_info =3D {
+	.ops =3D &as370_hwmon_ops,
+	.info =3D as370_hwmon_info,
+};
+
+static int as370_hwmon_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	struct device *hwmon_dev;
+	struct as370_hwmon *hwmon;
+	struct device *dev =3D &pdev->dev;
+
+	hwmon =3D devm_kzalloc(dev, sizeof(*hwmon), GFP_KERNEL);
+	if (!hwmon)
+		return -ENOMEM;
+
+	res =3D platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	hwmon->base =3D devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(hwmon->base))
+		return PTR_ERR(hwmon->base);
+
+	init_pvt(hwmon);
+
+	hwmon_dev =3D devm_hwmon_device_register_with_info(dev,
+							 "as370_hwmon",
+							 hwmon,
+							 &as370_chip_info,
+							 NULL);
+	return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static const struct of_device_id as370_hwmon_match[] =3D {
+	{ .compatible =3D "syna,as370-hwmon" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, as370_hwmon_match);
+
+static struct platform_driver as370_hwmon_driver =3D {
+	.probe =3D as370_hwmon_probe,
+	.driver =3D {
+		.name =3D "as370-hwmon",
+		.of_match_table =3D as370_hwmon_match,
+	},
+};
+module_platform_driver(as370_hwmon_driver);
+
+MODULE_AUTHOR("Jisheng Zhang<jszhang@kernel.org>");
+MODULE_DESCRIPTION("Synaptics AS370 SoC hardware monitor");
+MODULE_LICENSE("GPL v2");
--=20
2.23.0.rc1