blob: ea9602063eabc70f8955cd6a7eeded776f15ea99 [file] [log] [blame]
// 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 <samsagax@gmail.com>
*/
#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 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));
}
enum oxp_board {
aok_zoe_a1 = 1,
aya_neo_2,
aya_neo_air,
aya_neo_air_pro,
aya_neo_geek,
oxp_mini_amd,
oxp_mini_amd_a07,
oxp_mini_amd_pro,
};
static enum oxp_board board;
/* Fan reading and PWM */
#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 */
/* Turbo button takeover function
* Older boards have different values and EC registers
* for the same function
*/
#define OXP_OLD_TURBO_SWITCH_REG 0x1E
#define OXP_OLD_TURBO_TAKE_VAL 0x01
#define OXP_OLD_TURBO_RETURN_VAL 0x00
#define OXP_TURBO_SWITCH_REG 0xF1
#define OXP_TURBO_TAKE_VAL 0x40
#define OXP_TURBO_RETURN_VAL 0x00
static const struct dmi_system_id dmi_table[] = {
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "AOKZOE"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "AOKZOE A1 AR07"),
},
.driver_data = (void *)aok_zoe_a1,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "AOKZOE"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "AOKZOE A1 Pro"),
},
.driver_data = (void *)aok_zoe_a1,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "AYANEO"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "AYANEO 2"),
},
.driver_data = (void *)aya_neo_2,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "AYANEO"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "AIR"),
},
.driver_data = (void *)aya_neo_air,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "AYANEO"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "AIR Pro"),
},
.driver_data = (void *)aya_neo_air_pro,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "AYANEO"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "GEEK"),
},
.driver_data = (void *)aya_neo_geek,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ONE-NETBOOK"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "ONE XPLAYER"),
},
.driver_data = (void *)oxp_mini_amd,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ONE-NETBOOK"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "ONEXPLAYER mini A07"),
},
.driver_data = (void *)oxp_mini_amd_a07,
},
{
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ONE-NETBOOK"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "ONEXPLAYER Mini Pro"),
},
.driver_data = (void *)oxp_mini_amd_pro,
},
{},
};
/* 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(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;
}
/* Turbo button toggle functions */
static int tt_toggle_enable(void)
{
u8 reg;
u8 val;
switch (board) {
case oxp_mini_amd_a07:
reg = OXP_OLD_TURBO_SWITCH_REG;
val = OXP_OLD_TURBO_TAKE_VAL;
break;
case oxp_mini_amd_pro:
case aok_zoe_a1:
reg = OXP_TURBO_SWITCH_REG;
val = OXP_TURBO_TAKE_VAL;
break;
default:
return -EINVAL;
}
return write_to_ec(reg, val);
}
static int tt_toggle_disable(void)
{
u8 reg;
u8 val;
switch (board) {
case oxp_mini_amd_a07:
reg = OXP_OLD_TURBO_SWITCH_REG;
val = OXP_OLD_TURBO_RETURN_VAL;
break;
case oxp_mini_amd_pro:
case aok_zoe_a1:
reg = OXP_TURBO_SWITCH_REG;
val = OXP_TURBO_RETURN_VAL;
break;
default:
return -EINVAL;
}
return write_to_ec(reg, val);
}
/* Callbacks for turbo toggle attribute */
static umode_t tt_toggle_is_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
switch (board) {
case aok_zoe_a1:
case oxp_mini_amd_a07:
case oxp_mini_amd_pro:
return attr->mode;
default:
break;
}
return 0;
}
static ssize_t tt_toggle_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
int rval;
bool value;
rval = kstrtobool(buf, &value);
if (rval)
return rval;
if (value) {
rval = tt_toggle_enable();
} else {
rval = tt_toggle_disable();
}
if (rval)
return rval;
return count;
}
static ssize_t tt_toggle_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int retval;
u8 reg;
long val;
switch (board) {
case oxp_mini_amd_a07:
reg = OXP_OLD_TURBO_SWITCH_REG;
break;
case oxp_mini_amd_pro:
case aok_zoe_a1:
reg = OXP_TURBO_SWITCH_REG;
break;
default:
return -EINVAL;
}
retval = read_from_ec(reg, 1, &val);
if (retval)
return retval;
return sysfs_emit(buf, "%d\n", !!val);
}
static DEVICE_ATTR_RW(tt_toggle);
/* PWM enable/disable functions */
static int oxp_pwm_enable(void)
{
return write_to_ec(OXP_SENSOR_PWM_ENABLE_REG, 0x01);
}
static int oxp_pwm_disable(void)
{
return write_to_ec(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, 1, val);
if (ret)
return ret;
switch (board) {
case aya_neo_2:
case aya_neo_air:
case aya_neo_air_pro:
case aya_neo_geek:
case oxp_mini_amd:
case oxp_mini_amd_a07:
*val = (*val * 255) / 100;
break;
case oxp_mini_amd_pro:
case aok_zoe_a1:
default:
break;
}
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();
else if (val == 0)
return oxp_pwm_disable();
return -EINVAL;
case hwmon_pwm_input:
if (val < 0 || val > 255)
return -EINVAL;
switch (board) {
case aya_neo_2:
case aya_neo_air:
case aya_neo_air_pro:
case aya_neo_geek:
case oxp_mini_amd:
case oxp_mini_amd_a07:
val = (val * 100) / 255;
break;
case aok_zoe_a1:
case oxp_mini_amd_pro:
default:
break;
}
return write_to_ec(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 * const oxp_platform_sensors[] = {
HWMON_CHANNEL_INFO(fan,
HWMON_F_INPUT),
HWMON_CHANNEL_INFO(pwm,
HWMON_PWM_INPUT | HWMON_PWM_ENABLE),
NULL,
};
static struct attribute *oxp_ec_attrs[] = {
&dev_attr_tt_toggle.attr,
NULL
};
static struct attribute_group oxp_ec_attribute_group = {
.is_visible = tt_toggle_is_visible,
.attrs = oxp_ec_attrs,
};
static const struct attribute_group *oxp_ec_groups[] = {
&oxp_ec_attribute_group,
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)
{
struct device *dev = &pdev->dev;
struct device *hwdev;
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",
.dev_groups = oxp_ec_groups,
},
.probe = oxp_platform_probe,
};
static struct platform_device *oxp_platform_device;
static int __init oxp_platform_init(void)
{
const struct dmi_system_id *dmi_entry;
/*
* Have to check for AMD processor here because DMI strings are the
* same between Intel and AMD boards, the only way to tell them apart
* 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;
board = (enum oxp_board)(unsigned long)dmi_entry->driver_data;
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");