Photonicat PMU MCU will send status reports regularly, including board temperature. Signed-off-by: Junhao Xie <bigfoot@xxxxxxxxxxx> --- drivers/hwmon/Kconfig | 10 +++ drivers/hwmon/Makefile | 1 + drivers/hwmon/photonicat-hwmon.c | 129 +++++++++++++++++++++++++++++++ 3 files changed, 140 insertions(+) create mode 100644 drivers/hwmon/photonicat-hwmon.c diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index b60fe2e58ad6..b345e4856bcf 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -1781,6 +1781,16 @@ config SENSORS_PT5161L This driver can also be built as a module. If so, the module will be called pt5161l. +config SENSORS_PHOTONICAT_PMU_HWMON + tristate "Photonicat PMU temperature sensor" + depends on MFD_PHOTONICAT_PMU + help + If you say yes here you get support for temperature sensor on the + Photonicat PMU. + + This driver can also be built as a module. If so, the module + will be called photonicat-hwmon. + config SENSORS_PWM_FAN tristate "PWM fan" depends on PWM || COMPILE_TEST diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index b1c7056c37db..a30658acb093 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -183,6 +183,7 @@ obj-$(CONFIG_SENSORS_OXP) += oxp-sensors.o obj-$(CONFIG_SENSORS_PC87360) += pc87360.o obj-$(CONFIG_SENSORS_PC87427) += pc87427.o obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o +obj-$(CONFIG_SENSORS_PHOTONICAT_PMU_HWMON) += photonicat-hwmon.o obj-$(CONFIG_SENSORS_POWERZ) += powerz.o obj-$(CONFIG_SENSORS_POWR1220) += powr1220.o obj-$(CONFIG_SENSORS_PT5161L) += pt5161l.o diff --git a/drivers/hwmon/photonicat-hwmon.c b/drivers/hwmon/photonicat-hwmon.c new file mode 100644 index 000000000000..f1e3ee5f5781 --- /dev/null +++ b/drivers/hwmon/photonicat-hwmon.c @@ -0,0 +1,129 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2024 Junhao Xie <bigfoot@xxxxxxxxxxx> + */ + +#include <linux/completion.h> +#include <linux/hwmon.h> +#include <linux/mfd/photonicat-pmu.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> + +struct pcat_hwmon { + struct device *dev; + struct pcat_pmu *pmu; + struct notifier_block nb; + struct device *hwmon; + int temperature; + struct completion initial_report; +}; + +static ssize_t temp1_input_show(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct pcat_hwmon *hwmon = dev_get_drvdata(dev); + + return sprintf(buf, "%d\n", hwmon->temperature * 1000); +} + +static DEVICE_ATTR_RO(temp1_input); + +static struct attribute *pcat_pmu_temp_attrs[] = { + &dev_attr_temp1_input.attr, + NULL +}; + +ATTRIBUTE_GROUPS(pcat_pmu_temp); + +static int pcat_hwmon_notify(struct notifier_block *nb, unsigned long action, + void *data) +{ + struct pcat_hwmon *hwmon = container_of(nb, struct pcat_hwmon, nb); + struct pcat_data_cmd_status *status = pcat_data_get_data(data); + + if (action != PCAT_CMD_STATUS_REPORT) + return NOTIFY_DONE; + + hwmon->temperature = status->temp - 40; + complete(&hwmon->initial_report); + + return NOTIFY_DONE; +} + +static int pcat_hwmon_probe(struct platform_device *pdev) +{ + int ret; + struct device *dev = &pdev->dev; + struct pcat_hwmon *hwmon; + const char *label; + + hwmon = devm_kzalloc(dev, sizeof(*hwmon), GFP_KERNEL); + if (!hwmon) + return -ENOMEM; + + hwmon->dev = dev; + hwmon->pmu = dev_get_drvdata(dev->parent); + hwmon->nb.notifier_call = pcat_hwmon_notify; + init_completion(&hwmon->initial_report); + platform_set_drvdata(pdev, hwmon); + + ret = of_property_read_string(dev->of_node, "label", &label); + if (ret) + return dev_err_probe(dev, ret, "No label property\n"); + + ret = pcat_pmu_register_notify(hwmon->pmu, &hwmon->nb); + if (ret) + return ret; + + if (!wait_for_completion_timeout(&hwmon->initial_report, + msecs_to_jiffies(3000))) { + ret = dev_err_probe(dev, -ETIMEDOUT, + "timeout waiting for initial report\n"); + goto error; + } + + dev_info(dev, "Board Temprature: %d degress C\n", hwmon->temperature); + + hwmon->hwmon = devm_hwmon_device_register_with_groups( + dev, label, hwmon, pcat_pmu_temp_groups); + + if (IS_ERR(hwmon->hwmon)) { + ret = PTR_ERR(hwmon->hwmon); + dev_err_probe(&pdev->dev, ret, + "Failed to register hwmon device\n"); + goto error; + } + + return 0; +error: + pcat_pmu_unregister_notify(hwmon->pmu, &hwmon->nb); + return ret; +} + +static void pcat_hwmon_remove(struct platform_device *pdev) +{ + struct pcat_hwmon *hwmon = platform_get_drvdata(pdev); + + pcat_pmu_unregister_notify(hwmon->pmu, &hwmon->nb); +} + +static const struct of_device_id pcat_hwmon_dt_ids[] = { + { .compatible = "ariaboard,photonicat-pmu-hwmon", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, pcat_hwmon_dt_ids); + +static struct platform_driver pcat_hwmon_driver = { + .driver = { + .name = "photonicat-hwmon", + .of_match_table = pcat_hwmon_dt_ids, + }, + .probe = pcat_hwmon_probe, + .remove = pcat_hwmon_remove, +}; +module_platform_driver(pcat_hwmon_driver); + +MODULE_AUTHOR("Junhao Xie <bigfoot@xxxxxxxxxxx>"); +MODULE_DESCRIPTION("Photonicat PMU Hardware Monitor"); +MODULE_LICENSE("GPL"); -- 2.46.0