| Message ID | 20190826175029.433632f6@xhacker.debian (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | hwmon: a new driver for Synaptics AS370 PVT sensor | expand |
On 8/26/19 3:01 AM, Jisheng Zhang wrote: > 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. > > +config SENSORS_AS370 > + tristate "Synaptics AS370 SoC hardware monitoring driver" I think this needs "depends on HAS_IOMEM". > + 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-$(CONFIG_SENSORS_ADT7475) += adt7475.o > obj-$(CONFIG_SENSORS_APPLESMC) += applesmc.o > obj-$(CONFIG_SENSORS_ARM_SCMI) += scmi-hwmon.o > obj-$(CONFIG_SENSORS_ARM_SCPI) += scpi-hwmon.o > +obj-$(CONFIG_SENSORS_AS370) += as370-hwmon.o > obj-$(CONFIG_SENSORS_ASC7621) += asc7621.o > obj-$(CONFIG_SENSORS_ASPEED) += aspeed-pwm-tacho.o > obj-$(CONFIG_SENSORS_ATXP1) += 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> Unnecessary include file. > +#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) How about using GENMASK() ? > +#define EOC BIT(12) > + > +struct as370_hwmon { > + void __iomem *base; > +}; > + > +static void init_pvt(struct as370_hwmon *hwmon) > +{ > + u32 val; > + void __iomem *addr = hwmon->base + CTRL; > + > + val = PD; > + writel_relaxed(val, addr); > + val |= T_SEL; > + val &= ~V_SEL; > + val &= ~NMOS_SEL; > + val &= ~PMOS_SEL; What is the point of this ? We know that val == PD here. > + writel_relaxed(val, addr); > + val |= EN; > + writel_relaxed(val, addr); > + val &= ~PD; > + writel_relaxed(val, addr); > +} > + > +static int read_pvt(struct as370_hwmon *hwmon) > +{ > + return readl_relaxed(hwmon->base + STS) & BN_MASK; > +} Please fold into the calling code. > + > +static int as370_hwmon_read(struct device *dev, enum hwmon_sensor_types type, > + u32 attr, int channel, long *temp) > +{ > + int val; > + struct as370_hwmon *hwmon = dev_get_drvdata(dev); > + > + switch (attr) { > + case hwmon_temp_input: > + val = read_pvt(hwmon); > + if (val < 0) > + return val; read_pvt() doesn't return a negative error code. This check is unnecessary. > + *temp = val * 251802 / 4096 - 85525; This results in rounding down the reported temperature. It is ok if it is what you want; otherwise, I would suggest to use DIV_ROUND_CLOSEST(). > + 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 != hwmon_temp) > + return 0; > + > + switch (attr) { > + case hwmon_temp_input: > + return 0444; > + default: > + return 0; > + } > +} > + > +static const u32 as370_hwmon_temp_config[] = { > + HWMON_T_INPUT, > + 0 > +}; > + > +static const struct hwmon_channel_info as370_hwmon_temp = { > + .type = hwmon_temp, > + .config = as370_hwmon_temp_config, > +}; > + > +static const struct hwmon_channel_info *as370_hwmon_info[] = { > + &as370_hwmon_temp, > + NULL > +}; > + > +static const struct hwmon_ops as370_hwmon_ops = { > + .is_visible = as370_hwmon_is_visible, > + .read = as370_hwmon_read, > +}; > + > +static const struct hwmon_chip_info as370_chip_info = { > + .ops = &as370_hwmon_ops, > + .info = 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 = &pdev->dev; > + > + hwmon = devm_kzalloc(dev, sizeof(*hwmon), GFP_KERNEL); > + if (!hwmon) > + return -ENOMEM; > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + hwmon->base = devm_ioremap_resource(&pdev->dev, res); > + if (IS_ERR(hwmon->base)) > + return PTR_ERR(hwmon->base); > + > + init_pvt(hwmon); > + > + hwmon_dev = devm_hwmon_device_register_with_info(dev, > + "as370_hwmon", The "_hwmon" seems unnecessary. It will show up in "sensors" as part of the sensor name. Is this really what you want ? > + hwmon, > + &as370_chip_info, > + NULL); > + return PTR_ERR_OR_ZERO(hwmon_dev); > +} > + > +static const struct of_device_id as370_hwmon_match[] = { > + { .compatible = "syna,as370-hwmon" }, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, as370_hwmon_match); > + > +static struct platform_driver as370_hwmon_driver = { > + .probe = as370_hwmon_probe, > + .driver = { > + .name = "as370-hwmon", > + .of_match_table = 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"); >
Hi Guenter, On Mon, 26 Aug 2019 06:44:34 -0700 Guenter Roeck wrote: > > > On 8/26/19 3:01 AM, Jisheng Zhang wrote: > > 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. > > > > +config SENSORS_AS370 > > + tristate "Synaptics AS370 SoC hardware monitoring driver" > > I think this needs "depends on HAS_IOMEM". HWMON depends on HAS_IOMEM, so the dependency has been required by the common HWMON, we don't need it here. > > > + 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-$(CONFIG_SENSORS_ADT7475) += adt7475.o > > obj-$(CONFIG_SENSORS_APPLESMC) += applesmc.o > > obj-$(CONFIG_SENSORS_ARM_SCMI) += scmi-hwmon.o > > obj-$(CONFIG_SENSORS_ARM_SCPI) += scpi-hwmon.o > > +obj-$(CONFIG_SENSORS_AS370) += as370-hwmon.o > > obj-$(CONFIG_SENSORS_ASC7621) += asc7621.o > > obj-$(CONFIG_SENSORS_ASPEED) += aspeed-pwm-tacho.o > > obj-$(CONFIG_SENSORS_ATXP1) += 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> > > Unnecessary include file. will remove it in newer version. > > > +#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) > > How about using GENMASK() ? Good idea. > > > +#define EOC BIT(12) > > + > > +struct as370_hwmon { > > + void __iomem *base; > > +}; > > + > > +static void init_pvt(struct as370_hwmon *hwmon) > > +{ > > + u32 val; > > + void __iomem *addr = hwmon->base + CTRL; > > + > > + val = PD; > > + writel_relaxed(val, addr); > > + val |= T_SEL; > > + val &= ~V_SEL; > > + val &= ~NMOS_SEL; > > + val &= ~PMOS_SEL; > > What is the point of this ? We know that val == PD here. yes, could be removed > > > + writel_relaxed(val, addr); > > + val |= EN; > > + writel_relaxed(val, addr); > > + val &= ~PD; > > + writel_relaxed(val, addr); > > +} > > + > > +static int read_pvt(struct as370_hwmon *hwmon) > > +{ > > + return readl_relaxed(hwmon->base + STS) & BN_MASK; > > +} > > Please fold into the calling code. > > > + > > +static int as370_hwmon_read(struct device *dev, enum hwmon_sensor_types type, > > + u32 attr, int channel, long *temp) > > +{ > > + int val; > > + struct as370_hwmon *hwmon = dev_get_drvdata(dev); > > + > > + switch (attr) { > > + case hwmon_temp_input: > > + val = read_pvt(hwmon); > > + if (val < 0) > > + return val; > > read_pvt() doesn't return a negative error code. This check is unnecessary. > > > + *temp = val * 251802 / 4096 - 85525; > > This results in rounding down the reported temperature. It is ok if it is > what you want; otherwise, I would suggest to use DIV_ROUND_CLOSEST(). Good idea. Thanks for your review, Jisheng > > > + 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 != hwmon_temp) > > + return 0; > > + > > + switch (attr) { > > + case hwmon_temp_input: > > + return 0444; > > + default: > > + return 0; > > + } > > +} > > + > > +static const u32 as370_hwmon_temp_config[] = { > > + HWMON_T_INPUT, > > + 0 > > +}; > > + > > +static const struct hwmon_channel_info as370_hwmon_temp = { > > + .type = hwmon_temp, > > + .config = as370_hwmon_temp_config, > > +}; > > + > > +static const struct hwmon_channel_info *as370_hwmon_info[] = { > > + &as370_hwmon_temp, > > + NULL > > +}; > > + > > +static const struct hwmon_ops as370_hwmon_ops = { > > + .is_visible = as370_hwmon_is_visible, > > + .read = as370_hwmon_read, > > +}; > > + > > +static const struct hwmon_chip_info as370_chip_info = { > > + .ops = &as370_hwmon_ops, > > + .info = 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 = &pdev->dev; > > + > > + hwmon = devm_kzalloc(dev, sizeof(*hwmon), GFP_KERNEL); > > + if (!hwmon) > > + return -ENOMEM; > > + > > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > > + hwmon->base = devm_ioremap_resource(&pdev->dev, res); > > + if (IS_ERR(hwmon->base)) > > + return PTR_ERR(hwmon->base); > > + > > + init_pvt(hwmon); > > + > > + hwmon_dev = devm_hwmon_device_register_with_info(dev, > > + "as370_hwmon", > > The "_hwmon" seems unnecessary. It will show up in "sensors" as part > of the sensor name. Is this really what you want ? > > > + hwmon, > > + &as370_chip_info, > > + NULL); > > + return PTR_ERR_OR_ZERO(hwmon_dev); > > +} > > + > > +static const struct of_device_id as370_hwmon_match[] = { > > + { .compatible = "syna,as370-hwmon" }, > > + {}, > > +}; > > +MODULE_DEVICE_TABLE(of, as370_hwmon_match); > > + > > +static struct platform_driver as370_hwmon_driver = { > > + .probe = as370_hwmon_probe, > > + .driver = { > > + .name = "as370-hwmon", > > + .of_match_table = 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"); > > >
On 8/26/19 8:02 PM, Jisheng Zhang wrote: > Hi Guenter, > > On Mon, 26 Aug 2019 06:44:34 -0700 Guenter Roeck wrote: > >> >> >> On 8/26/19 3:01 AM, Jisheng Zhang wrote: >>> 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. >>> >>> +config SENSORS_AS370 >>> + tristate "Synaptics AS370 SoC hardware monitoring driver" >> >> I think this needs "depends on HAS_IOMEM". > > HWMON depends on HAS_IOMEM, so the dependency has been required > by the common HWMON, we don't need it here. > This is so wrong :-(. As if I2C or SPI based sensor chips would require iomem. Oh well, no one complained in 12+ years, so I guess we are "fine", at least for the time being. Thanks for noticing. Guenter
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. +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-$(CONFIG_SENSORS_ADT7475) += adt7475.o obj-$(CONFIG_SENSORS_APPLESMC) += applesmc.o obj-$(CONFIG_SENSORS_ARM_SCMI) += scmi-hwmon.o obj-$(CONFIG_SENSORS_ARM_SCPI) += scpi-hwmon.o +obj-$(CONFIG_SENSORS_AS370) += as370-hwmon.o obj-$(CONFIG_SENSORS_ASC7621) += asc7621.o obj-$(CONFIG_SENSORS_ASPEED) += aspeed-pwm-tacho.o obj-$(CONFIG_SENSORS_ATXP1) += 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 = hwmon->base + CTRL; + + val = PD; + writel_relaxed(val, addr); + val |= T_SEL; + val &= ~V_SEL; + val &= ~NMOS_SEL; + val &= ~PMOS_SEL; + writel_relaxed(val, addr); + val |= EN; + writel_relaxed(val, addr); + val &= ~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 type, + u32 attr, int channel, long *temp) +{ + int val; + struct as370_hwmon *hwmon = dev_get_drvdata(dev); + + switch (attr) { + case hwmon_temp_input: + val = read_pvt(hwmon); + if (val < 0) + return val; + *temp = 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 != hwmon_temp) + return 0; + + switch (attr) { + case hwmon_temp_input: + return 0444; + default: + return 0; + } +} + +static const u32 as370_hwmon_temp_config[] = { + HWMON_T_INPUT, + 0 +}; + +static const struct hwmon_channel_info as370_hwmon_temp = { + .type = hwmon_temp, + .config = as370_hwmon_temp_config, +}; + +static const struct hwmon_channel_info *as370_hwmon_info[] = { + &as370_hwmon_temp, + NULL +}; + +static const struct hwmon_ops as370_hwmon_ops = { + .is_visible = as370_hwmon_is_visible, + .read = as370_hwmon_read, +}; + +static const struct hwmon_chip_info as370_chip_info = { + .ops = &as370_hwmon_ops, + .info = 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 = &pdev->dev; + + hwmon = devm_kzalloc(dev, sizeof(*hwmon), GFP_KERNEL); + if (!hwmon) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + hwmon->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(hwmon->base)) + return PTR_ERR(hwmon->base); + + init_pvt(hwmon); + + hwmon_dev = 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[] = { + { .compatible = "syna,as370-hwmon" }, + {}, +}; +MODULE_DEVICE_TABLE(of, as370_hwmon_match); + +static struct platform_driver as370_hwmon_driver = { + .probe = as370_hwmon_probe, + .driver = { + .name = "as370-hwmon", + .of_match_table = 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");
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