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Mon, 24 Jan 2022 07:10:44 -0500 (EST) From: Alistair Francis To: broonie@kernel.org, robh+dt@kernel.org, kernel@pengutronix.de, lgirdwood@gmail.com, lee.jones@linaro.org Cc: linux-pm@vger.kernel.org, linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org, linux-imx@nxp.com, rui.zhang@intel.com, alistair23@gmail.com, amitk@kernel.org, linux-arm-kernel@lists.infradead.org, andreas@kemnade.info, s.hauer@pengutronix.de, linux-kernel@vger.kernel.org, shawnguo@kernel.org, Alistair Francis , Guenter Roeck Subject: [PATCH v18 5/8] hwmon: sy7636a: Add temperature driver for sy7636a Date: Mon, 24 Jan 2022 22:10:06 +1000 Message-Id: <20220124121009.108649-6-alistair@alistair23.me> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220124121009.108649-1-alistair@alistair23.me> References: <20220124121009.108649-1-alistair@alistair23.me> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220124_041051_400299_75D19711 X-CRM114-Status: GOOD ( 18.36 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This is a multi-function device to interface with the sy7636a EPD PMIC chip from Silergy. Signed-off-by: Alistair Francis Acked-by: Guenter Roeck --- Documentation/hwmon/index.rst | 1 + Documentation/hwmon/sy7636a-hwmon.rst | 26 +++++++ drivers/hwmon/Kconfig | 9 +++ drivers/hwmon/Makefile | 1 + drivers/hwmon/sy7636a-hwmon.c | 106 ++++++++++++++++++++++++++ 5 files changed, 143 insertions(+) create mode 100644 Documentation/hwmon/sy7636a-hwmon.rst create mode 100644 drivers/hwmon/sy7636a-hwmon.c diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst index df20022c741f..6e0906ef5d25 100644 --- a/Documentation/hwmon/index.rst +++ b/Documentation/hwmon/index.rst @@ -185,6 +185,7 @@ Hardware Monitoring Kernel Drivers smsc47m1 sparx5-temp stpddc60 + sy7636a-hwmon tc654 tc74 thmc50 diff --git a/Documentation/hwmon/sy7636a-hwmon.rst b/Documentation/hwmon/sy7636a-hwmon.rst new file mode 100644 index 000000000000..5612079397d5 --- /dev/null +++ b/Documentation/hwmon/sy7636a-hwmon.rst @@ -0,0 +1,26 @@ +.. SPDX-License-Identifier: GPL-2.0-or-later + +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 8df25f1079ba..aa5785e657a4 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -1672,6 +1672,15 @@ 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 185f946d698b..fe54a3dfdb03 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -186,6 +186,7 @@ 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..6dd9c2a0f0e0 --- /dev/null +++ b/drivers/hwmon/sy7636a-hwmon.c @@ -0,0 +1,106 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Functions to access SY3686A power management chip temperature + * + * Copyright (C) 2021 reMarkable AS - http://www.remarkable.com/ + * + * Authors: Lars Ivar Miljeteig + * Alistair Francis + */ + +#include +#include +#include +#include +#include +#include +#include + +#include + +static int sy7636a_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *temp) +{ + struct regmap *regmap = dev_get_drvdata(dev); + int ret, reg_val; + + ret = regmap_read(regmap, + SY7636A_REG_TERMISTOR_READOUT, ®_val); + if (ret) + return ret; + + *temp = reg_val * 1000; + + return 0; +} + +static umode_t sy7636a_is_visible(const void *data, + enum hwmon_sensor_types type, + u32 attr, int channel) +{ + if (type != hwmon_temp) + return 0; + + if (attr != hwmon_temp_input) + return 0; + + return 0444; +} + +static const struct hwmon_ops sy7636a_hwmon_ops = { + .is_visible = sy7636a_is_visible, + .read = sy7636a_read, +}; + +static const struct hwmon_channel_info *sy7636a_info[] = { + HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ), + HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT), + NULL +}; + +static const struct hwmon_chip_info sy7636a_chip_info = { + .ops = &sy7636a_hwmon_ops, + .info = sy7636a_info, +}; + +static int sy7636a_sensor_probe(struct platform_device *pdev) +{ + struct regmap *regmap = dev_get_regmap(pdev->dev.parent, NULL); + struct regulator *regulator; + struct device *hwmon_dev; + int err; + + if (!regmap) + return -EPROBE_DEFER; + + regulator = devm_regulator_get(&pdev->dev, "vcom"); + if (IS_ERR(regulator)) + return PTR_ERR(regulator); + + err = regulator_enable(regulator); + if (err) + return err; + + hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev, + "sy7636a_temperature", regmap, + &sy7636a_chip_info, NULL); + + 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");