// SPDX-License-Identifier: GPL-2.0+ /* * Platform driver for OneXPlayer, AOK ZOE, and Aya Neo Handhelds that expose * fan reading and control via hwmon sysfs. * * Old OXP boards have the same DMI strings and they are told apart by * the boot cpu vendor (Intel/AMD). Currently only AMD boards are * supported but the code is made to be simple to add other handheld * boards in the future. * Fan control is provided via pwm interface in the range [0-255]. * Old AMD boards use [0-100] as range in the EC, the written value is * scaled to accommodate for that. Newer boards like the mini PRO and * AOK ZOE are not scaled but have the same EC layout. * * Copyright (C) 2022 Joaquín I. Aramendía <[email protected]> */ #include <linux/acpi.h> #include <linux/dmi.h> #include <linux/hwmon.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/processor.h> /* Handle ACPI lock mechanism */ static u32 oxp_mutex; #define ACPI_LOCK_DELAY_MS … static bool lock_global_acpi_lock(void) { … } static bool unlock_global_acpi_lock(void) { … } enum oxp_board { … }; static enum oxp_board board; /* Fan reading and PWM */ #define OXP_SENSOR_FAN_REG … #define OXP_SENSOR_PWM_ENABLE_REG … #define OXP_SENSOR_PWM_REG … /* Turbo button takeover function * Older boards have different values and EC registers * for the same function */ #define OXP_OLD_TURBO_SWITCH_REG … #define OXP_OLD_TURBO_TAKE_VAL … #define OXP_OLD_TURBO_RETURN_VAL … #define OXP_TURBO_SWITCH_REG … #define OXP_TURBO_TAKE_VAL … #define OXP_TURBO_RETURN_VAL … static const struct dmi_system_id dmi_table[] = …; /* Helper functions to handle EC read/write */ static int read_from_ec(u8 reg, int size, long *val) { … } static int write_to_ec(u8 reg, u8 value) { … } /* Turbo button toggle functions */ static int tt_toggle_enable(void) { … } static int tt_toggle_disable(void) { … } /* Callbacks for turbo toggle attribute */ static umode_t tt_toggle_is_visible(struct kobject *kobj, struct attribute *attr, int n) { … } static ssize_t tt_toggle_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static ssize_t tt_toggle_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static DEVICE_ATTR_RW(tt_toggle); /* PWM enable/disable functions */ static int oxp_pwm_enable(void) { … } static int oxp_pwm_disable(void) { … } /* Callbacks for hwmon interface */ static umode_t oxp_ec_hwmon_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr, int channel) { … } static int oxp_platform_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val) { … } static int oxp_platform_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long val) { … } /* Known sensors in the OXP EC controllers */ static const struct hwmon_channel_info * const oxp_platform_sensors[] = …; static struct attribute *oxp_ec_attrs[] = …; static struct attribute_group oxp_ec_attribute_group = …; static const struct attribute_group *oxp_ec_groups[] = …; static const struct hwmon_ops oxp_ec_hwmon_ops = …; static const struct hwmon_chip_info oxp_ec_chip_info = …; /* Initialization logic */ static int oxp_platform_probe(struct platform_device *pdev) { … } static struct platform_driver oxp_platform_driver = …; static struct platform_device *oxp_platform_device; static int __init oxp_platform_init(void) { … } static void __exit oxp_platform_exit(void) { … } MODULE_DEVICE_TABLE(dmi, dmi_table); module_init(…) …; module_exit(oxp_platform_exit); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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