| Message ID | 20200608091739.2368-4-narmstrong@baylibre.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | mfd: Add support for Khadas Microcontroller | expand |
On Mon, Jun 8, 2020 at 2:47 PM Neil Armstrong <narmstrong@baylibre.com> wrote: > > The new Khadas VIM2 and VIM3 boards controls the cooling fan via the > on-board microcontroller. > > This implements the FAN control as thermal devices and as cell of the Khadas > MCU MFD driver. > > Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org> > --- > drivers/thermal/Kconfig | 11 ++ > drivers/thermal/Makefile | 1 + > drivers/thermal/khadas_mcu_fan.c | 174 +++++++++++++++++++++++++++++++ > 3 files changed, 186 insertions(+) > create mode 100644 drivers/thermal/khadas_mcu_fan.c > > diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig > index 91af271e9bb0..53efd381f434 100644 > --- a/drivers/thermal/Kconfig > +++ b/drivers/thermal/Kconfig > @@ -490,4 +490,15 @@ config SPRD_THERMAL > help > Support for the Spreadtrum thermal sensor driver in the Linux thermal > framework. > + > +config KHADAS_MCU_FAN_THERMAL > + tristate "Khadas MCU controller FAN cooling support" > + depends on OF || COMPILE_TEST > + depends on MFD_KHADAS_MCU > + select MFD_CORE > + select REGMAP > + help > + If you say yes here you get support for the FAN controlled > + by the Microcontroller found on the Khadas VIM boards. > + > endif > diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile > index 8c8ed7b79915..460428c2122c 100644 > --- a/drivers/thermal/Makefile > +++ b/drivers/thermal/Makefile > @@ -60,3 +60,4 @@ obj-$(CONFIG_ZX2967_THERMAL) += zx2967_thermal.o > obj-$(CONFIG_UNIPHIER_THERMAL) += uniphier_thermal.o > obj-$(CONFIG_AMLOGIC_THERMAL) += amlogic_thermal.o > obj-$(CONFIG_SPRD_THERMAL) += sprd_thermal.o > +obj-$(CONFIG_KHADAS_MCU_FAN_THERMAL) += khadas_mcu_fan.o > diff --git a/drivers/thermal/khadas_mcu_fan.c b/drivers/thermal/khadas_mcu_fan.c > new file mode 100644 > index 000000000000..6995b443cad4 > --- /dev/null > +++ b/drivers/thermal/khadas_mcu_fan.c > @@ -0,0 +1,174 @@ > +// SPDX-License-Identifier: GPL-2.0-or-later > +/* > + * Khadas MCU Controlled FAN driver > + * > + * Copyright (C) 2020 BayLibre SAS > + * Author(s): Neil Armstrong <narmstrong@baylibre.com> > + */ > + > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/platform_device.h> > +#include <linux/mfd/khadas-mcu.h> > +#include <linux/regmap.h> > +#include <linux/sysfs.h> > +#include <linux/thermal.h> > + > +#define MAX_LEVEL 3 > + > +struct khadas_mcu_fan_ctx { > + struct khadas_mcu *mcu; > + unsigned int level; > + struct thermal_cooling_device *cdev; > +}; > + > +static int khadas_mcu_fan_set_level(struct khadas_mcu_fan_ctx *ctx, > + unsigned int level) > +{ > + int ret; > + > + ret = regmap_write(ctx->mcu->regmap, KHADAS_MCU_CMD_FAN_STATUS_CTRL_REG, > + level); > + if (ret) > + return ret; > + > + ctx->level = level; > + > + return 0; > +} > + > +static int khadas_mcu_fan_get_max_state(struct thermal_cooling_device *cdev, > + unsigned long *state) > +{ > + struct khadas_mcu_fan_ctx *ctx = cdev->devdata; > + > + if (!ctx) > + return -EINVAL; > + > + *state = MAX_LEVEL; > + > + return 0; > +} > + > +static int khadas_mcu_fan_get_cur_state(struct thermal_cooling_device *cdev, > + unsigned long *state) > +{ > + struct khadas_mcu_fan_ctx *ctx = cdev->devdata; > + > + if (!ctx) > + return -EINVAL; > + > + *state = ctx->level; > + > + return 0; > +} > + > +static int > +khadas_mcu_fan_set_cur_state(struct thermal_cooling_device *cdev, > + unsigned long state) > +{ > + struct khadas_mcu_fan_ctx *ctx = cdev->devdata; > + > + if (!ctx || (state > MAX_LEVEL)) > + return -EINVAL; > + > + if (state == ctx->level) > + return 0; > + > + return khadas_mcu_fan_set_level(ctx, state); > +} > + > +static const struct thermal_cooling_device_ops khadas_mcu_fan_cooling_ops = { > + .get_max_state = khadas_mcu_fan_get_max_state, > + .get_cur_state = khadas_mcu_fan_get_cur_state, > + .set_cur_state = khadas_mcu_fan_set_cur_state, > +}; > + > +static int khadas_mcu_fan_probe(struct platform_device *pdev) > +{ > + struct khadas_mcu *mcu = dev_get_drvdata(pdev->dev.parent); > + struct thermal_cooling_device *cdev; > + struct device *dev = &pdev->dev; > + struct khadas_mcu_fan_ctx *ctx; > + int ret; > + > + ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); > + if (!ctx) > + return -ENOMEM; > + ctx->mcu = mcu; > + platform_set_drvdata(pdev, ctx); > + > + cdev = devm_thermal_of_cooling_device_register(dev->parent, > + dev->parent->of_node, "khadas-mcu-fan", ctx, > + &khadas_mcu_fan_cooling_ops); > + if (IS_ERR(cdev)) { > + ret = PTR_ERR(cdev); > + dev_err(dev, > + "Failed to register khadas-mcu-fan as cooling device: %d\n", > + ret); > + return ret; > + } > + ctx->cdev = cdev; > + thermal_cdev_update(cdev); > + > + return 0; > +} > + > +static int khadas_mcu_fan_disable(struct device *dev) > +{ > + struct khadas_mcu_fan_ctx *ctx = dev_get_drvdata(dev); > + unsigned int level_save = ctx->level; > + int ret; > + > + ret = khadas_mcu_fan_set_level(ctx, 0); > + if (ret) > + return ret; > + > + ctx->level = level_save; > + > + return 0; > +} > + > +static void khadas_mcu_fan_shutdown(struct platform_device *pdev) > +{ > + khadas_mcu_fan_disable(&pdev->dev); > +} > + > +#ifdef CONFIG_PM_SLEEP > +static int khadas_mcu_fan_suspend(struct device *dev) > +{ > + return khadas_mcu_fan_disable(dev); > +} > + > +static int khadas_mcu_fan_resume(struct device *dev) > +{ > + struct khadas_mcu_fan_ctx *ctx = dev_get_drvdata(dev); > + > + return khadas_mcu_fan_set_level(ctx, ctx->level); > +} > +#endif > + > +static SIMPLE_DEV_PM_OPS(khadas_mcu_fan_pm, khadas_mcu_fan_suspend, > + khadas_mcu_fan_resume); > + > +static const struct platform_device_id khadas_mcu_fan_id_table[] = { > + { .name = "khadas-mcu-fan-ctrl", }, > + {}, > +}; > +MODULE_DEVICE_TABLE(platform, khadas_mcu_fan_id_table); > + > +static struct platform_driver khadas_mcu_fan_driver = { > + .probe = khadas_mcu_fan_probe, > + .shutdown = khadas_mcu_fan_shutdown, > + .driver = { > + .name = "khadas-mcu-fan-ctrl", > + .pm = &khadas_mcu_fan_pm, > + }, > + .id_table = khadas_mcu_fan_id_table, > +}; > + > +module_platform_driver(khadas_mcu_fan_driver); > + > +MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>"); > +MODULE_DESCRIPTION("Khadas MCU FAN driver"); > +MODULE_LICENSE("GPL"); > -- > 2.22.0 >
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index 91af271e9bb0..53efd381f434 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -490,4 +490,15 @@ config SPRD_THERMAL help Support for the Spreadtrum thermal sensor driver in the Linux thermal framework. + +config KHADAS_MCU_FAN_THERMAL + tristate "Khadas MCU controller FAN cooling support" + depends on OF || COMPILE_TEST + depends on MFD_KHADAS_MCU + select MFD_CORE + select REGMAP + help + If you say yes here you get support for the FAN controlled + by the Microcontroller found on the Khadas VIM boards. + endif diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index 8c8ed7b79915..460428c2122c 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -60,3 +60,4 @@ obj-$(CONFIG_ZX2967_THERMAL) += zx2967_thermal.o obj-$(CONFIG_UNIPHIER_THERMAL) += uniphier_thermal.o obj-$(CONFIG_AMLOGIC_THERMAL) += amlogic_thermal.o obj-$(CONFIG_SPRD_THERMAL) += sprd_thermal.o +obj-$(CONFIG_KHADAS_MCU_FAN_THERMAL) += khadas_mcu_fan.o diff --git a/drivers/thermal/khadas_mcu_fan.c b/drivers/thermal/khadas_mcu_fan.c new file mode 100644 index 000000000000..6995b443cad4 --- /dev/null +++ b/drivers/thermal/khadas_mcu_fan.c @@ -0,0 +1,174 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Khadas MCU Controlled FAN driver + * + * Copyright (C) 2020 BayLibre SAS + * Author(s): Neil Armstrong <narmstrong@baylibre.com> + */ + +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/mfd/khadas-mcu.h> +#include <linux/regmap.h> +#include <linux/sysfs.h> +#include <linux/thermal.h> + +#define MAX_LEVEL 3 + +struct khadas_mcu_fan_ctx { + struct khadas_mcu *mcu; + unsigned int level; + struct thermal_cooling_device *cdev; +}; + +static int khadas_mcu_fan_set_level(struct khadas_mcu_fan_ctx *ctx, + unsigned int level) +{ + int ret; + + ret = regmap_write(ctx->mcu->regmap, KHADAS_MCU_CMD_FAN_STATUS_CTRL_REG, + level); + if (ret) + return ret; + + ctx->level = level; + + return 0; +} + +static int khadas_mcu_fan_get_max_state(struct thermal_cooling_device *cdev, + unsigned long *state) +{ + struct khadas_mcu_fan_ctx *ctx = cdev->devdata; + + if (!ctx) + return -EINVAL; + + *state = MAX_LEVEL; + + return 0; +} + +static int khadas_mcu_fan_get_cur_state(struct thermal_cooling_device *cdev, + unsigned long *state) +{ + struct khadas_mcu_fan_ctx *ctx = cdev->devdata; + + if (!ctx) + return -EINVAL; + + *state = ctx->level; + + return 0; +} + +static int +khadas_mcu_fan_set_cur_state(struct thermal_cooling_device *cdev, + unsigned long state) +{ + struct khadas_mcu_fan_ctx *ctx = cdev->devdata; + + if (!ctx || (state > MAX_LEVEL)) + return -EINVAL; + + if (state == ctx->level) + return 0; + + return khadas_mcu_fan_set_level(ctx, state); +} + +static const struct thermal_cooling_device_ops khadas_mcu_fan_cooling_ops = { + .get_max_state = khadas_mcu_fan_get_max_state, + .get_cur_state = khadas_mcu_fan_get_cur_state, + .set_cur_state = khadas_mcu_fan_set_cur_state, +}; + +static int khadas_mcu_fan_probe(struct platform_device *pdev) +{ + struct khadas_mcu *mcu = dev_get_drvdata(pdev->dev.parent); + struct thermal_cooling_device *cdev; + struct device *dev = &pdev->dev; + struct khadas_mcu_fan_ctx *ctx; + int ret; + + ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + ctx->mcu = mcu; + platform_set_drvdata(pdev, ctx); + + cdev = devm_thermal_of_cooling_device_register(dev->parent, + dev->parent->of_node, "khadas-mcu-fan", ctx, + &khadas_mcu_fan_cooling_ops); + if (IS_ERR(cdev)) { + ret = PTR_ERR(cdev); + dev_err(dev, + "Failed to register khadas-mcu-fan as cooling device: %d\n", + ret); + return ret; + } + ctx->cdev = cdev; + thermal_cdev_update(cdev); + + return 0; +} + +static int khadas_mcu_fan_disable(struct device *dev) +{ + struct khadas_mcu_fan_ctx *ctx = dev_get_drvdata(dev); + unsigned int level_save = ctx->level; + int ret; + + ret = khadas_mcu_fan_set_level(ctx, 0); + if (ret) + return ret; + + ctx->level = level_save; + + return 0; +} + +static void khadas_mcu_fan_shutdown(struct platform_device *pdev) +{ + khadas_mcu_fan_disable(&pdev->dev); +} + +#ifdef CONFIG_PM_SLEEP +static int khadas_mcu_fan_suspend(struct device *dev) +{ + return khadas_mcu_fan_disable(dev); +} + +static int khadas_mcu_fan_resume(struct device *dev) +{ + struct khadas_mcu_fan_ctx *ctx = dev_get_drvdata(dev); + + return khadas_mcu_fan_set_level(ctx, ctx->level); +} +#endif + +static SIMPLE_DEV_PM_OPS(khadas_mcu_fan_pm, khadas_mcu_fan_suspend, + khadas_mcu_fan_resume); + +static const struct platform_device_id khadas_mcu_fan_id_table[] = { + { .name = "khadas-mcu-fan-ctrl", }, + {}, +}; +MODULE_DEVICE_TABLE(platform, khadas_mcu_fan_id_table); + +static struct platform_driver khadas_mcu_fan_driver = { + .probe = khadas_mcu_fan_probe, + .shutdown = khadas_mcu_fan_shutdown, + .driver = { + .name = "khadas-mcu-fan-ctrl", + .pm = &khadas_mcu_fan_pm, + }, + .id_table = khadas_mcu_fan_id_table, +}; + +module_platform_driver(khadas_mcu_fan_driver); + +MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>"); +MODULE_DESCRIPTION("Khadas MCU FAN driver"); +MODULE_LICENSE("GPL");
The new Khadas VIM2 and VIM3 boards controls the cooling fan via the on-board microcontroller. This implements the FAN control as thermal devices and as cell of the Khadas MCU MFD driver. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> --- drivers/thermal/Kconfig | 11 ++ drivers/thermal/Makefile | 1 + drivers/thermal/khadas_mcu_fan.c | 174 +++++++++++++++++++++++++++++++ 3 files changed, 186 insertions(+) create mode 100644 drivers/thermal/khadas_mcu_fan.c