| Message ID | 20200725231834.25642-9-michael@walle.cc (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add support for Kontron sl28cpld | expand |
On Sun, Jul 26, 2020 at 01:18:29AM +0200, Michael Walle wrote: > Add support for the hardware monitoring controller of the sl28cpld board > management controller. This driver is part of a multi-function device. FWIW, Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> > Signed-off-by: Michael Walle <michael@walle.cc> > Acked-by: Guenter Roeck <linux@roeck-us.net> > --- > Changes since v5: > - none > > Changes since v4: > - update copyright year > - remove #include <linux/of_device.h>, suggested by Andy. > - use PTR_ERR_OR_ZERO(), suggested by Andy. > - remove the platform device table > - don't use KBUID_MODNAME > > Changes since v3: > - see cover letter > > Documentation/hwmon/index.rst | 1 + > Documentation/hwmon/sl28cpld.rst | 36 ++++++++ > drivers/hwmon/Kconfig | 10 +++ > drivers/hwmon/Makefile | 1 + > drivers/hwmon/sl28cpld-hwmon.c | 142 +++++++++++++++++++++++++++++++ > 5 files changed, 190 insertions(+) > create mode 100644 Documentation/hwmon/sl28cpld.rst > create mode 100644 drivers/hwmon/sl28cpld-hwmon.c > > diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst > index 750d3a975d82..d90c43c82936 100644 > --- a/Documentation/hwmon/index.rst > +++ b/Documentation/hwmon/index.rst > @@ -154,6 +154,7 @@ Hardware Monitoring Kernel Drivers > sht3x > shtc1 > sis5595 > + sl28cpld > smm665 > smsc47b397 > smsc47m192 > diff --git a/Documentation/hwmon/sl28cpld.rst b/Documentation/hwmon/sl28cpld.rst > new file mode 100644 > index 000000000000..7ed65f78250c > --- /dev/null > +++ b/Documentation/hwmon/sl28cpld.rst > @@ -0,0 +1,36 @@ > +.. SPDX-License-Identifier: GPL-2.0-only > + > +Kernel driver sl28cpld > +====================== > + > +Supported chips: > + > + * Kontron sl28cpld > + > + Prefix: 'sl28cpld' > + > + Datasheet: not available > + > +Authors: Michael Walle <michael@walle.cc> > + > +Description > +----------- > + > +The sl28cpld is a board management controller which also exposes a hardware > +monitoring controller. At the moment this controller supports a single fan > +supervisor. In the future there might be other flavours and additional > +hardware monitoring might be supported. > + > +The fan supervisor has a 7 bit counter register and a counter period of 1 > +second. If the 7 bit counter overflows, the supervisor will automatically > +switch to x8 mode to support a wider input range at the loss of > +granularity. > + > +Sysfs entries > +------------- > + > +The following attributes are supported. > + > +======================= ======================================================== > +fan1_input Fan RPM. Assuming 2 pulses per revolution. > +======================= ======================================================== > diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig > index 8dc28b26916e..a02829ec7386 100644 > --- a/drivers/hwmon/Kconfig > +++ b/drivers/hwmon/Kconfig > @@ -1479,6 +1479,16 @@ 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 sl28cpld hardware monitoring driver" > + select MFD_SIMPLE_MFD_I2C > + help > + If you say yes here you get support for the fan supervisor of the > + sl28cpld board management controller. > + > + 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 a8f4b35b136b..dee8511f9348 100644 > --- a/drivers/hwmon/Makefile > +++ b/drivers/hwmon/Makefile > @@ -159,6 +159,7 @@ 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..e48f58ec5b9c > --- /dev/null > +++ b/drivers/hwmon/sl28cpld-hwmon.c > @@ -0,0 +1,142 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * sl28cpld hardware monitoring driver > + * > + * Copyright 2020 Kontron Europe GmbH > + */ > + > +#include <linux/bitfield.h> > +#include <linux/hwmon.h> > +#include <linux/kernel.h> > +#include <linux/mod_devicetable.h> > +#include <linux/module.h> > +#include <linux/platform_device.h> > +#include <linux/property.h> > +#include <linux/regmap.h> > + > +#define FAN_INPUT 0x00 > +#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 sl28cpld_hwmon *hwmon; > + struct device *hwmon_dev; > + int ret; > + > + if (!pdev->dev.parent) > + return -ENODEV; > + > + hwmon = devm_kzalloc(&pdev->dev, sizeof(*hwmon), GFP_KERNEL); > + if (!hwmon) > + return -ENOMEM; > + > + hwmon->regmap = dev_get_regmap(pdev->dev.parent, NULL); > + if (!hwmon->regmap) > + return -ENODEV; > + > + ret = device_property_read_u32(&pdev->dev, "reg", &hwmon->offset); > + if (ret) > + return -EINVAL; > + > + 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_OR_ZERO(hwmon_dev); > +} > + > +static const struct of_device_id sl28cpld_hwmon_of_match[] = { > + { .compatible = "kontron,sl28cpld-fan" }, > + {} > +}; > +MODULE_DEVICE_TABLE(of, sl28cpld_hwmon_of_match); > + > +static struct platform_driver sl28cpld_hwmon_driver = { > + .probe = sl28cpld_hwmon_probe, > + .driver = { > + .name = "sl28cpld-fan", > + .of_match_table = sl28cpld_hwmon_of_match, > + }, > +}; > +module_platform_driver(sl28cpld_hwmon_driver); > + > +MODULE_DESCRIPTION("sl28cpld Hardware Monitoring Driver"); > +MODULE_AUTHOR("Michael Walle <michael@walle.cc>"); > +MODULE_LICENSE("GPL"); > -- > 2.20.1 >
diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst index 750d3a975d82..d90c43c82936 100644 --- a/Documentation/hwmon/index.rst +++ b/Documentation/hwmon/index.rst @@ -154,6 +154,7 @@ Hardware Monitoring Kernel Drivers sht3x shtc1 sis5595 + sl28cpld smm665 smsc47b397 smsc47m192 diff --git a/Documentation/hwmon/sl28cpld.rst b/Documentation/hwmon/sl28cpld.rst new file mode 100644 index 000000000000..7ed65f78250c --- /dev/null +++ b/Documentation/hwmon/sl28cpld.rst @@ -0,0 +1,36 @@ +.. SPDX-License-Identifier: GPL-2.0-only + +Kernel driver sl28cpld +====================== + +Supported chips: + + * Kontron sl28cpld + + Prefix: 'sl28cpld' + + Datasheet: not available + +Authors: Michael Walle <michael@walle.cc> + +Description +----------- + +The sl28cpld is a board management controller which also exposes a hardware +monitoring controller. At the moment this controller supports a single fan +supervisor. In the future there might be other flavours and additional +hardware monitoring might be supported. + +The fan supervisor has a 7 bit counter register and a counter period of 1 +second. If the 7 bit counter overflows, the supervisor will automatically +switch to x8 mode to support a wider input range at the loss of +granularity. + +Sysfs entries +------------- + +The following attributes are supported. + +======================= ======================================================== +fan1_input Fan RPM. Assuming 2 pulses per revolution. +======================= ======================================================== diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 8dc28b26916e..a02829ec7386 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -1479,6 +1479,16 @@ 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 sl28cpld hardware monitoring driver" + select MFD_SIMPLE_MFD_I2C + help + If you say yes here you get support for the fan supervisor of the + sl28cpld board management controller. + + 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 a8f4b35b136b..dee8511f9348 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -159,6 +159,7 @@ 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..e48f58ec5b9c --- /dev/null +++ b/drivers/hwmon/sl28cpld-hwmon.c @@ -0,0 +1,142 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * sl28cpld hardware monitoring driver + * + * Copyright 2020 Kontron Europe GmbH + */ + +#include <linux/bitfield.h> +#include <linux/hwmon.h> +#include <linux/kernel.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/property.h> +#include <linux/regmap.h> + +#define FAN_INPUT 0x00 +#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 sl28cpld_hwmon *hwmon; + struct device *hwmon_dev; + int ret; + + if (!pdev->dev.parent) + return -ENODEV; + + hwmon = devm_kzalloc(&pdev->dev, sizeof(*hwmon), GFP_KERNEL); + if (!hwmon) + return -ENOMEM; + + hwmon->regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (!hwmon->regmap) + return -ENODEV; + + ret = device_property_read_u32(&pdev->dev, "reg", &hwmon->offset); + if (ret) + return -EINVAL; + + 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_OR_ZERO(hwmon_dev); +} + +static const struct of_device_id sl28cpld_hwmon_of_match[] = { + { .compatible = "kontron,sl28cpld-fan" }, + {} +}; +MODULE_DEVICE_TABLE(of, sl28cpld_hwmon_of_match); + +static struct platform_driver sl28cpld_hwmon_driver = { + .probe = sl28cpld_hwmon_probe, + .driver = { + .name = "sl28cpld-fan", + .of_match_table = sl28cpld_hwmon_of_match, + }, +}; +module_platform_driver(sl28cpld_hwmon_driver); + +MODULE_DESCRIPTION("sl28cpld Hardware Monitoring Driver"); +MODULE_AUTHOR("Michael Walle <michael@walle.cc>"); +MODULE_LICENSE("GPL");