Linux-Watchdog Archive on lore.kernel.org
 help / color / Atom feed
From: Michael Walle <michael@walle.cc>
To: linux-gpio@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org,
	linux-pwm@vger.kernel.org, linux-watchdog@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Cc: "Linus Walleij" <linus.walleij@linaro.org>,
	"Bartosz Golaszewski" <bgolaszewski@baylibre.com>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Jean Delvare" <jdelvare@suse.com>,
	"Guenter Roeck" <linux@roeck-us.net>,
	"Lee Jones" <lee.jones@linaro.org>,
	"Thierry Reding" <thierry.reding@gmail.com>,
	"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
	"Wim Van Sebroeck" <wim@linux-watchdog.org>,
	"Shawn Guo" <shawnguo@kernel.org>, "Li Yang" <leoyang.li@nxp.com>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Jason Cooper" <jason@lakedaemon.net>,
	"Marc Zyngier" <maz@kernel.org>,
	"Michael Walle" <michael@walle.cc>
Subject: [PATCH 14/18] hwmon: add support for the sl28cpld hardware monitoring controller
Date: Tue, 17 Mar 2020 21:50:13 +0100
Message-ID: <20200317205017.28280-15-michael@walle.cc> (raw)
In-Reply-To: <20200317205017.28280-1-michael@walle.cc>

This adds support for the hardware monitoring controller of the sl28cpld
board management controller. This driver is part of a multi-function
device.

Signed-off-by: Michael Walle <michael@walle.cc>
---
 drivers/hwmon/Kconfig          |  10 +++
 drivers/hwmon/Makefile         |   1 +
 drivers/hwmon/sl28cpld-hwmon.c | 146 +++++++++++++++++++++++++++++++++
 3 files changed, 157 insertions(+)
 create mode 100644 drivers/hwmon/sl28cpld-hwmon.c

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 05a30832c6ba..c98716f78cfa 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1412,6 +1412,16 @@ config SENSORS_RASPBERRYPI_HWMON
 	  This driver can also be built as a module. If so, the module
 	  will be called raspberrypi-hwmon.
 
+config SENSORS_SL28CPLD
+	tristate "Kontron's SMARC-sAL28 hardware monitoring driver"
+	depends on MFD_SL28CPLD
+	help
+	  If you say yes here you get support for a fan connected to the
+	  input of the SMARC connector of Kontron's SMARC-sAL28 module.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called sl28cpld-hwmon.
+
 config SENSORS_SHT15
 	tristate "Sensiron humidity and temperature sensors. SHT15 and compat."
 	depends on GPIOLIB || COMPILE_TEST
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index b0b9c8e57176..dfb0f8cda2dd 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -155,6 +155,7 @@ obj-$(CONFIG_SENSORS_S3C)	+= s3c-hwmon.o
 obj-$(CONFIG_SENSORS_SCH56XX_COMMON)+= sch56xx-common.o
 obj-$(CONFIG_SENSORS_SCH5627)	+= sch5627.o
 obj-$(CONFIG_SENSORS_SCH5636)	+= sch5636.o
+obj-$(CONFIG_SENSORS_SL28CPLD)	+= sl28cpld-hwmon.o
 obj-$(CONFIG_SENSORS_SHT15)	+= sht15.o
 obj-$(CONFIG_SENSORS_SHT21)	+= sht21.o
 obj-$(CONFIG_SENSORS_SHT3x)	+= sht3x.o
diff --git a/drivers/hwmon/sl28cpld-hwmon.c b/drivers/hwmon/sl28cpld-hwmon.c
new file mode 100644
index 000000000000..7ac42bb0a48c
--- /dev/null
+++ b/drivers/hwmon/sl28cpld-hwmon.c
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * SMARC-sAL28 fan hardware monitoring driver.
+ *
+ * Copyright 2019 Kontron Europe GmbH
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/bitfield.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/regmap.h>
+#include <linux/platform_device.h>
+#include <linux/hwmon.h>
+
+#define FAN_INPUT		0
+#define   FAN_SCALE_X8		BIT(7)
+#define   FAN_VALUE_MASK	GENMASK(6, 0)
+
+struct sl28cpld_hwmon {
+	struct regmap *regmap;
+	u32 offset;
+};
+
+static umode_t sl28cpld_hwmon_is_visible(const void *data,
+					 enum hwmon_sensor_types type,
+					 u32 attr, int channel)
+{
+	return 0444;
+}
+
+static int sl28cpld_hwmon_read(struct device *dev,
+			       enum hwmon_sensor_types type, u32 attr,
+			       int channel, long *input)
+{
+	struct sl28cpld_hwmon *hwmon = dev_get_drvdata(dev);
+	unsigned int value;
+	int ret;
+
+	switch (attr) {
+	case hwmon_fan_input:
+		ret = regmap_read(hwmon->regmap, hwmon->offset + FAN_INPUT,
+				  &value);
+		if (ret)
+			return ret;
+		/*
+		 * The register has a 7 bit value and 1 bit which indicates the
+		 * scale. If the MSB is set, then the lower 7 bit has to be
+		 * multiplied by 8, to get the correct reading.
+		 */
+		if (value & FAN_SCALE_X8)
+			value = FIELD_GET(FAN_VALUE_MASK, value) << 3;
+
+		/*
+		 * The counter period is 1000ms and the sysfs specification
+		 * says we should asssume 2 pulses per revolution.
+		 */
+		value *= 60 / 2;
+
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	*input = value;
+	return 0;
+}
+
+static const u32 sl28cpld_hwmon_fan_config[] = {
+	HWMON_F_INPUT,
+	0
+};
+
+static const struct hwmon_channel_info sl28cpld_hwmon_fan = {
+	.type = hwmon_fan,
+	.config = sl28cpld_hwmon_fan_config,
+};
+
+static const struct hwmon_channel_info *sl28cpld_hwmon_info[] = {
+	&sl28cpld_hwmon_fan,
+	NULL
+};
+
+static const struct hwmon_ops sl28cpld_hwmon_ops = {
+	.is_visible = sl28cpld_hwmon_is_visible,
+	.read = sl28cpld_hwmon_read,
+};
+
+static const struct hwmon_chip_info sl28cpld_hwmon_chip_info = {
+	.ops = &sl28cpld_hwmon_ops,
+	.info = sl28cpld_hwmon_info,
+};
+
+static int sl28cpld_hwmon_probe(struct platform_device *pdev)
+{
+	struct device *hwmon_dev;
+	struct sl28cpld_hwmon *hwmon;
+	struct resource *res;
+
+	hwmon = devm_kzalloc(&pdev->dev, sizeof(*hwmon), GFP_KERNEL);
+	if (!hwmon)
+		return -ENOMEM;
+
+	if (!pdev->dev.parent)
+		return -ENODEV;
+
+	hwmon->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+	if (!hwmon->regmap)
+		return -ENODEV;
+
+	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
+	if (!res)
+		return -EINVAL;
+	hwmon->offset = res->start;
+
+	hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev,
+							 "sl28cpld_hwmon",
+							 hwmon,
+							 &sl28cpld_hwmon_chip_info,
+							 NULL);
+	if (IS_ERR(hwmon_dev)) {
+		dev_err(&pdev->dev, "failed to register as hwmon device");
+		return PTR_ERR(hwmon_dev);
+	}
+
+	return 0;
+}
+
+static const struct platform_device_id sl28cpld_hwmon_id_table[] = {
+	{"sl28cpld-fan", 0},
+};
+MODULE_DEVICE_TABLE(platform, sl28cpld_hwmon_id_table);
+
+static struct platform_driver sl28cpld_hwmon_driver = {
+	.probe = sl28cpld_hwmon_probe,
+	.id_table = sl28cpld_hwmon_id_table,
+	.driver = {
+		.name = "sl28cpld-hwmon",
+	},
+};
+module_platform_driver(sl28cpld_hwmon_driver);
+
+MODULE_DESCRIPTION("sl28cpld Hardware Monitoring Driver");
+MODULE_LICENSE("GPL");
-- 
2.20.1


  parent reply index

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-17 20:49 [PATCH 00/18] Add support for Kontron sl28cpld Michael Walle
2020-03-17 20:50 ` [PATCH 01/18] include/linux/ioport.h: add helper to define REG resource constructs Michael Walle
2020-03-17 20:50 ` [PATCH 02/18] mfd: mfd-core: Don't overwrite the dma_mask of the child device Michael Walle
2020-03-17 20:50 ` [PATCH 03/18] mfd: mfd-core: match device tree node against reg property Michael Walle
2020-03-17 20:50 ` [PATCH 04/18] dt-bindings: mfd: Add bindings for sl28cpld Michael Walle
2020-03-30 22:35   ` Rob Herring
2020-03-31  7:40     ` Michael Walle
2020-03-17 20:50 ` [PATCH 05/18] mfd: Add support for Kontron sl28cpld management controller Michael Walle
2020-03-18  3:28   ` Guenter Roeck
2020-03-18 16:38     ` Michael Walle
2020-03-17 20:50 ` [PATCH 06/18] irqchip: add sl28cpld interrupt controller support Michael Walle
2020-03-18 16:53   ` Guenter Roeck
2020-03-18 17:06     ` Michael Walle
2020-03-18 20:35       ` Guenter Roeck
2020-03-17 20:50 ` [PATCH 07/18] dt-bindings: watchdog: Add bindings for sl28cpld watchdog Michael Walle
2020-03-17 20:50 ` [PATCH 08/18] watchdog: add support " Michael Walle
2020-03-18  3:17   ` Guenter Roeck
2020-03-17 20:50 ` [PATCH 09/18] dt-bindings: pwm: Add bindings for sl28cpld PWM controller Michael Walle
2020-03-17 20:50 ` [PATCH 10/18] pwm: add support " Michael Walle
2020-03-17 20:50 ` [PATCH 11/18] dt-bindings: gpio: Add bindings for sl28cpld GPIO controller Michael Walle
2020-03-17 20:50 ` [PATCH 12/18] gpio: add support for the " Michael Walle
2020-03-18  9:14   ` Bartosz Golaszewski
2020-03-18 12:45     ` Michael Walle
2020-03-25 11:50       ` Bartosz Golaszewski
2020-03-26 20:05         ` Michael Walle
2020-03-27 10:20           ` Linus Walleij
2020-03-27 15:28             ` Michael Walle
2020-03-27 19:01               ` Linus Walleij
2020-03-30 11:21               ` Bartosz Golaszewski
2020-03-30 11:48                 ` Michael Walle
2020-03-28 12:04     ` Michael Walle
2020-03-28 17:20     ` Michael Walle
2020-03-17 20:50 ` [PATCH 13/18] dt-bindings: hwmon: Add bindings for sl28cpld hardware monitoring Michael Walle
2020-03-17 20:50 ` Michael Walle [this message]
2020-03-18  3:27   ` [PATCH 14/18] hwmon: add support for the sl28cpld hardware monitoring controller Guenter Roeck
2020-03-18 16:32     ` Michael Walle
2020-03-17 20:50 ` [PATCH 15/18] arm64: dts: freescale: sl28: enable sl28cpld Michael Walle
2020-03-17 20:50 ` [PATCH 16/18] arm64: dts: freescale: sl28: map GPIOs to input events Michael Walle
2020-03-17 20:50 ` [PATCH 17/18] arm64: dts: freescale: sl28: enable LED support Michael Walle
2020-03-17 20:50 ` [PATCH 18/18] arm64: dts: freescale: sl28: enable fan support Michael Walle

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200317205017.28280-15-michael@walle.cc \
    --to=michael@walle.cc \
    --cc=bgolaszewski@baylibre.com \
    --cc=devicetree@vger.kernel.org \
    --cc=jason@lakedaemon.net \
    --cc=jdelvare@suse.com \
    --cc=lee.jones@linaro.org \
    --cc=leoyang.li@nxp.com \
    --cc=linus.walleij@linaro.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-gpio@vger.kernel.org \
    --cc=linux-hwmon@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pwm@vger.kernel.org \
    --cc=linux-watchdog@vger.kernel.org \
    --cc=linux@roeck-us.net \
    --cc=maz@kernel.org \
    --cc=robh+dt@kernel.org \
    --cc=shawnguo@kernel.org \
    --cc=tglx@linutronix.de \
    --cc=thierry.reding@gmail.com \
    --cc=u.kleine-koenig@pengutronix.de \
    --cc=wim@linux-watchdog.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-Watchdog Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-watchdog/0 linux-watchdog/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-watchdog linux-watchdog/ https://lore.kernel.org/linux-watchdog \
		linux-watchdog@vger.kernel.org
	public-inbox-index linux-watchdog

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-watchdog


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git