319 lines
7.2 KiB
C
319 lines
7.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Platform driver for OneXPlayer, AOK ZOE, and Aya Neo Handhelds that expose
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* fan reading and control via hwmon sysfs.
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*
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* Old OXP boards have the same DMI strings and they are told apart by
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* the boot cpu vendor (Intel/AMD). Currently only AMD boards are
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* supported but the code is made to be simple to add other handheld
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* boards in the future.
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* Fan control is provided via pwm interface in the range [0-255].
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* Old AMD boards use [0-100] as range in the EC, the written value is
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* scaled to accommodate for that. Newer boards like the mini PRO and
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* AOK ZOE are not scaled but have the same EC layout.
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*
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* Copyright (C) 2022 Joaquín I. Aramendía <samsagax@gmail.com>
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*/
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#include <linux/acpi.h>
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#include <linux/dev_printk.h>
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#include <linux/dmi.h>
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#include <linux/hwmon.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/processor.h>
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/* Handle ACPI lock mechanism */
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static u32 oxp_mutex;
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#define ACPI_LOCK_DELAY_MS 500
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static bool lock_global_acpi_lock(void)
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{
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return ACPI_SUCCESS(acpi_acquire_global_lock(ACPI_LOCK_DELAY_MS, &oxp_mutex));
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}
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static bool unlock_global_acpi_lock(void)
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{
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return ACPI_SUCCESS(acpi_release_global_lock(oxp_mutex));
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}
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enum oxp_board {
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aok_zoe_a1 = 1,
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aya_neo_air,
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aya_neo_air_pro,
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oxp_mini_amd,
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oxp_mini_amd_pro,
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};
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static enum oxp_board board;
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#define OXP_SENSOR_FAN_REG 0x76 /* Fan reading is 2 registers long */
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#define OXP_SENSOR_PWM_ENABLE_REG 0x4A /* PWM enable is 1 register long */
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#define OXP_SENSOR_PWM_REG 0x4B /* PWM reading is 1 register long */
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static const struct dmi_system_id dmi_table[] = {
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{
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "AOKZOE"),
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DMI_EXACT_MATCH(DMI_BOARD_NAME, "AOKZOE A1 AR07"),
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},
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.driver_data = (void *) &(enum oxp_board) {aok_zoe_a1},
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},
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{
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "AYANEO"),
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DMI_EXACT_MATCH(DMI_BOARD_NAME, "AIR"),
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},
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.driver_data = (void *) &(enum oxp_board) {aya_neo_air},
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},
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{
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "AYANEO"),
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DMI_EXACT_MATCH(DMI_BOARD_NAME, "AIR Pro"),
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},
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.driver_data = (void *) &(enum oxp_board) {aya_neo_air_pro},
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},
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{
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "ONE-NETBOOK"),
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DMI_EXACT_MATCH(DMI_BOARD_NAME, "ONE XPLAYER"),
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},
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.driver_data = (void *) &(enum oxp_board) {oxp_mini_amd},
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},
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{
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.matches = {
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DMI_MATCH(DMI_BOARD_VENDOR, "ONE-NETBOOK"),
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DMI_EXACT_MATCH(DMI_BOARD_NAME, "ONEXPLAYER Mini Pro"),
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},
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.driver_data = (void *) &(enum oxp_board) {oxp_mini_amd_pro},
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},
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{},
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};
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/* Helper functions to handle EC read/write */
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static int read_from_ec(u8 reg, int size, long *val)
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{
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int i;
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int ret;
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u8 buffer;
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if (!lock_global_acpi_lock())
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return -EBUSY;
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*val = 0;
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for (i = 0; i < size; i++) {
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ret = ec_read(reg + i, &buffer);
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if (ret)
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return ret;
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*val <<= i * 8;
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*val += buffer;
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}
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if (!unlock_global_acpi_lock())
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return -EBUSY;
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return 0;
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}
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static int write_to_ec(const struct device *dev, u8 reg, u8 value)
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{
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int ret;
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if (!lock_global_acpi_lock())
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return -EBUSY;
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ret = ec_write(reg, value);
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if (!unlock_global_acpi_lock())
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return -EBUSY;
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return ret;
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}
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static int oxp_pwm_enable(const struct device *dev)
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{
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return write_to_ec(dev, OXP_SENSOR_PWM_ENABLE_REG, 0x01);
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}
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static int oxp_pwm_disable(const struct device *dev)
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{
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return write_to_ec(dev, OXP_SENSOR_PWM_ENABLE_REG, 0x00);
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}
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/* Callbacks for hwmon interface */
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static umode_t oxp_ec_hwmon_is_visible(const void *drvdata,
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enum hwmon_sensor_types type, u32 attr, int channel)
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{
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switch (type) {
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case hwmon_fan:
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return 0444;
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case hwmon_pwm:
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return 0644;
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default:
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return 0;
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}
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}
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static int oxp_platform_read(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long *val)
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{
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int ret;
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switch (type) {
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case hwmon_fan:
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switch (attr) {
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case hwmon_fan_input:
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return read_from_ec(OXP_SENSOR_FAN_REG, 2, val);
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default:
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break;
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}
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break;
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case hwmon_pwm:
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switch (attr) {
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case hwmon_pwm_input:
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ret = read_from_ec(OXP_SENSOR_PWM_REG, 1, val);
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if (ret)
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return ret;
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switch (board) {
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case aya_neo_air:
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case aya_neo_air_pro:
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case oxp_mini_amd:
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*val = (*val * 255) / 100;
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break;
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case oxp_mini_amd_pro:
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case aok_zoe_a1:
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default:
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break;
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}
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return 0;
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case hwmon_pwm_enable:
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return read_from_ec(OXP_SENSOR_PWM_ENABLE_REG, 1, val);
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default:
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break;
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}
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break;
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default:
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break;
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}
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return -EOPNOTSUPP;
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}
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static int oxp_platform_write(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long val)
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{
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switch (type) {
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case hwmon_pwm:
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switch (attr) {
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case hwmon_pwm_enable:
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if (val == 1)
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return oxp_pwm_enable(dev);
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else if (val == 0)
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return oxp_pwm_disable(dev);
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return -EINVAL;
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case hwmon_pwm_input:
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if (val < 0 || val > 255)
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return -EINVAL;
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switch (board) {
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case aya_neo_air:
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case aya_neo_air_pro:
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case oxp_mini_amd:
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val = (val * 100) / 255;
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break;
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case aok_zoe_a1:
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case oxp_mini_amd_pro:
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default:
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break;
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}
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return write_to_ec(dev, OXP_SENSOR_PWM_REG, val);
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default:
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break;
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}
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break;
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default:
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break;
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}
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return -EOPNOTSUPP;
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}
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/* Known sensors in the OXP EC controllers */
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static const struct hwmon_channel_info *oxp_platform_sensors[] = {
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HWMON_CHANNEL_INFO(fan,
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HWMON_F_INPUT),
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HWMON_CHANNEL_INFO(pwm,
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HWMON_PWM_INPUT | HWMON_PWM_ENABLE),
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NULL,
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};
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static const struct hwmon_ops oxp_ec_hwmon_ops = {
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.is_visible = oxp_ec_hwmon_is_visible,
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.read = oxp_platform_read,
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.write = oxp_platform_write,
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};
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static const struct hwmon_chip_info oxp_ec_chip_info = {
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.ops = &oxp_ec_hwmon_ops,
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.info = oxp_platform_sensors,
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};
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/* Initialization logic */
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static int oxp_platform_probe(struct platform_device *pdev)
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{
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const struct dmi_system_id *dmi_entry;
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struct device *dev = &pdev->dev;
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struct device *hwdev;
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/*
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* Have to check for AMD processor here because DMI strings are the
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* same between Intel and AMD boards, the only way to tell them apart
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* is the CPU.
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* Intel boards seem to have different EC registers and values to
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* read/write.
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*/
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dmi_entry = dmi_first_match(dmi_table);
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if (!dmi_entry || boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
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return -ENODEV;
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board = *((enum oxp_board *) dmi_entry->driver_data);
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hwdev = devm_hwmon_device_register_with_info(dev, "oxpec", NULL,
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&oxp_ec_chip_info, NULL);
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return PTR_ERR_OR_ZERO(hwdev);
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}
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static struct platform_driver oxp_platform_driver = {
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.driver = {
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.name = "oxp-platform",
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},
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.probe = oxp_platform_probe,
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};
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static struct platform_device *oxp_platform_device;
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static int __init oxp_platform_init(void)
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{
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oxp_platform_device =
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platform_create_bundle(&oxp_platform_driver,
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oxp_platform_probe, NULL, 0, NULL, 0);
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return PTR_ERR_OR_ZERO(oxp_platform_device);
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}
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static void __exit oxp_platform_exit(void)
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{
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platform_device_unregister(oxp_platform_device);
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platform_driver_unregister(&oxp_platform_driver);
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}
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MODULE_DEVICE_TABLE(dmi, dmi_table);
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module_init(oxp_platform_init);
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module_exit(oxp_platform_exit);
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MODULE_AUTHOR("Joaquín Ignacio Aramendía <samsagax@gmail.com>");
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MODULE_DESCRIPTION("Platform driver that handles EC sensors of OneXPlayer devices");
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MODULE_LICENSE("GPL");
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