diff options
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/Kconfig | 11 | ||||
| -rw-r--r-- | drivers/hwmon/Makefile | 1 | ||||
| -rw-r--r-- | drivers/hwmon/oxp-sensors.c | 256 |
3 files changed, 268 insertions, 0 deletions
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index a5253abb7ea7..3176c33af6c6 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -1616,6 +1616,17 @@ config SENSORS_NZXT_SMART2 source "drivers/hwmon/occ/Kconfig" +config SENSORS_OXP + tristate "OneXPlayer EC fan control" + depends on ACPI + depends on X86 + help + If you say yes here you get support for fan readings and control over + OneXPlayer handheld devices. Only OneXPlayer mini AMD handheld variant + boards are supported. + + Can also be built as a module. In that case it will be called oxp-sensors. + config SENSORS_PCF8591 tristate "Philips PCF8591 ADC/DAC" depends on I2C diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index c5cd7e3a67ff..e2e4e87b282f 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -167,6 +167,7 @@ obj-$(CONFIG_SENSORS_NSA320) += nsa320-hwmon.o obj-$(CONFIG_SENSORS_NTC_THERMISTOR) += ntc_thermistor.o obj-$(CONFIG_SENSORS_NZXT_KRAKEN2) += nzxt-kraken2.o obj-$(CONFIG_SENSORS_NZXT_SMART2) += nzxt-smart2.o +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 diff --git a/drivers/hwmon/oxp-sensors.c b/drivers/hwmon/oxp-sensors.c new file mode 100644 index 000000000000..b1653eb5e670 --- /dev/null +++ b/drivers/hwmon/oxp-sensors.c @@ -0,0 +1,256 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Platform driver for OXP Handhelds that expose fan reading and control + * via hwmon sysfs. + * + * All boards have the same DMI strings and they are told appart 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]. AMD + * boards use [0-100] as range in the EC, the written value is scaled to + * accommodate for that. + * + * Copyright (C) 2022 Joaquín I. Aramendía <samsagax@gmail.com> + */ + +#include <linux/acpi.h> +#include <linux/dev_printk.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 500 + +static bool lock_global_acpi_lock(void) +{ + return ACPI_SUCCESS(acpi_acquire_global_lock(ACPI_LOCK_DELAY_MS, &oxp_mutex)); +} + +static bool unlock_global_acpi_lock(void) +{ + return ACPI_SUCCESS(acpi_release_global_lock(oxp_mutex)); +} + +#define OXP_SENSOR_FAN_REG 0x76 /* Fan reading is 2 registers long */ +#define OXP_SENSOR_PWM_ENABLE_REG 0x4A /* PWM enable is 1 register long */ +#define OXP_SENSOR_PWM_REG 0x4B /* PWM reading is 1 register long */ + +static const struct dmi_system_id dmi_table[] = { + { + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "ONE-NETBOOK"), + DMI_EXACT_MATCH(DMI_BOARD_NAME, "ONE XPLAYER"), + }, + }, + {}, +}; + +/* Helper functions to handle EC read/write */ +static int read_from_ec(u8 reg, int size, long *val) +{ + int i; + int ret; + u8 buffer; + + if (!lock_global_acpi_lock()) + return -EBUSY; + + *val = 0; + for (i = 0; i < size; i++) { + ret = ec_read(reg + i, &buffer); + if (ret) + return ret; + *val <<= i * 8; + *val += buffer; + } + + if (!unlock_global_acpi_lock()) + return -EBUSY; + + return 0; +} + +static int write_to_ec(const struct device *dev, u8 reg, u8 value) +{ + int ret; + + if (!lock_global_acpi_lock()) + return -EBUSY; + + ret = ec_write(reg, value); + + if (!unlock_global_acpi_lock()) + return -EBUSY; + + return ret; +} + +static int oxp_pwm_enable(const struct device *dev) +{ + return write_to_ec(dev, OXP_SENSOR_PWM_ENABLE_REG, 0x01); +} + +static int oxp_pwm_disable(const struct device *dev) +{ + return write_to_ec(dev, OXP_SENSOR_PWM_ENABLE_REG, 0x00); +} + +/* Callbacks for hwmon interface */ +static umode_t oxp_ec_hwmon_is_visible(const void *drvdata, + enum hwmon_sensor_types type, u32 attr, int channel) +{ + switch (type) { + case hwmon_fan: + return 0444; + case hwmon_pwm: + return 0644; + default: + return 0; + } +} + +static int oxp_platform_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + int ret; + + switch (type) { + case hwmon_fan: + switch (attr) { + case hwmon_fan_input: + return read_from_ec(OXP_SENSOR_FAN_REG, 2, val); + default: + break; + } + break; + case hwmon_pwm: + switch (attr) { + case hwmon_pwm_input: + ret = read_from_ec(OXP_SENSOR_PWM_REG, 2, val); + if (ret) + return ret; + *val = (*val * 255) / 100; + return 0; + case hwmon_pwm_enable: + return read_from_ec(OXP_SENSOR_PWM_ENABLE_REG, 1, val); + default: + break; + } + break; + default: + break; + } + return -EOPNOTSUPP; +} + +static int oxp_platform_write(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long val) +{ + switch (type) { + case hwmon_pwm: + switch (attr) { + case hwmon_pwm_enable: + if (val == 1) + return oxp_pwm_enable(dev); + else if (val == 0) + return oxp_pwm_disable(dev); + return -EINVAL; + case hwmon_pwm_input: + if (val < 0 || val > 255) + return -EINVAL; + val = (val * 100) / 255; + return write_to_ec(dev, OXP_SENSOR_PWM_REG, val); + default: + break; + } + break; + default: + break; + } + return -EOPNOTSUPP; +} + +/* Known sensors in the OXP EC controllers */ +static const struct hwmon_channel_info *oxp_platform_sensors[] = { + HWMON_CHANNEL_INFO(fan, + HWMON_F_INPUT), + HWMON_CHANNEL_INFO(pwm, + HWMON_PWM_INPUT | HWMON_PWM_ENABLE), + NULL, +}; + +static const struct hwmon_ops oxp_ec_hwmon_ops = { + .is_visible = oxp_ec_hwmon_is_visible, + .read = oxp_platform_read, + .write = oxp_platform_write, +}; + +static const struct hwmon_chip_info oxp_ec_chip_info = { + .ops = &oxp_ec_hwmon_ops, + .info = oxp_platform_sensors, +}; + +/* Initialization logic */ +static int oxp_platform_probe(struct platform_device *pdev) +{ + const struct dmi_system_id *dmi_entry; + struct device *dev = &pdev->dev; + struct device *hwdev; + + /* + * Have to check for AMD processor here because DMI strings are the + * same between Intel and AMD boards, the only way to tell them appart + * is the CPU. + * Intel boards seem to have different EC registers and values to + * read/write. + */ + dmi_entry = dmi_first_match(dmi_table); + if (!dmi_entry || boot_cpu_data.x86_vendor != X86_VENDOR_AMD) + return -ENODEV; + + hwdev = devm_hwmon_device_register_with_info(dev, "oxpec", NULL, + &oxp_ec_chip_info, NULL); + + return PTR_ERR_OR_ZERO(hwdev); +} + +static struct platform_driver oxp_platform_driver = { + .driver = { + .name = "oxp-platform", + }, + .probe = oxp_platform_probe, +}; + +static struct platform_device *oxp_platform_device; + +static int __init oxp_platform_init(void) +{ + oxp_platform_device = + platform_create_bundle(&oxp_platform_driver, + oxp_platform_probe, NULL, 0, NULL, 0); + + return PTR_ERR_OR_ZERO(oxp_platform_device); +} + +static void __exit oxp_platform_exit(void) +{ + platform_device_unregister(oxp_platform_device); + platform_driver_unregister(&oxp_platform_driver); +} + +MODULE_DEVICE_TABLE(dmi, dmi_table); + +module_init(oxp_platform_init); +module_exit(oxp_platform_exit); + +MODULE_AUTHOR("Joaquín Ignacio Aramendía <samsagax@gmail.com>"); +MODULE_DESCRIPTION("Platform driver that handles EC sensors of OneXPlayer devices"); +MODULE_LICENSE("GPL"); |