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Sat, 28 Mar 2026 22:39:14 -0700 (PDT) Received: from cachyos-x8664.iitd.ac.in ([2001:df4:e000:3fd2:59eb:b75c:7ede:19e7]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82ca8437441sm3710896b3a.3.2026.03.28.22.39.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 28 Mar 2026 22:39:14 -0700 (PDT) From: Bani Brata To: platform-driver-x86@vger.kernel.org Cc: Bani Brata , Hans de Goede , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , linux-kernel@vger.kernel.org Subject: [PATCH 2/2] platform/x86: hp-wmi: Add ACPI PWM fan control for HP ENVY 13-bd0xxx Date: Sun, 29 Mar 2026 11:09:05 +0530 Message-ID: <20260329053907.31647-1-banibrata2007@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On the HP ENVY x360 Convertible 13-bd0xxx (board 8824), standard WMI methods for fan speed control and RPM reporting do not function. However, the DSDT exposes ACPI methods (\_SB.PC00.LPCB.EC0.FANG and FANW) that allow reading and writing an 8-bit PWM level (0-255) to the EC. This patch maps these ACPI methods to standard hwmon `pwm1` and `pwm1_enable` nodes, allowing userspace tools to successfully control the fan speed. Signed-off-by: Bani Brata --- drivers/platform/x86/hp/hp-wmi.c | 155 ++++++++++++++++++++++++++++++- 1 file changed, 155 insertions(+) diff --git a/drivers/platform/x86/hp/hp-wmi.c b/drivers/platform/x86/hp/hp-wmi.c index XXXXXXX..XXXXXXX 100644 --- a/drivers/platform/x86/hp/hp-wmi.c +++ b/drivers/platform/x86/hp/hp-wmi.c @@ -48,6 +48,14 @@ #define HP_FAN_SPEED_AUTOMATIC 0x00 #define HP_POWER_LIMIT_DEFAULT 0x00 #define HP_POWER_LIMIT_NO_CHANGE 0xFF +#define HP_ENVY_8824_ACPI_FANG "\\_SB.PC00.LPCB.EC0.FANG" +#define HP_ENVY_8824_ACPI_FANW "\\_SB.PC00.LPCB.EC0.FANW" +#define HP_ENVY_8824_FAN_VALUE_ARG 33026ULL +#define HP_ENVY_8824_FAN_PRIME_ARG 33030ULL +#define HP_ENVY_8824_FAN_PRIME_MANUAL 0xFFULL +#define HP_ENVY_8824_FAN_PRIME_AUTO 0x8ULL +#define HP_ENVY_8824_PWM_MODE_MANUAL 1 +#define HP_ENVY_8824_PWM_MODE_AUTO 2 #define ACPI_AC_CLASS "ac_adapter" @@ -193,6 +201,8 @@ static const struct dmi_system_id hp_wmi_rfkill_dmi_table[] __initconst = { static bool is_victus_s_board; static bool is_envy_x360_8824_board; +static DEFINE_MUTEX(hp_envy_x360_8824_fan_lock); +static int hp_envy_x360_8824_pwm_mode = HP_ENVY_8824_PWM_MODE_AUTO; static const struct dmi_system_id hp_envy_x360_8824_boards[] __initconst = { { @@ -518,6 +528,120 @@ static int hp_wmi_get_fan_speed_victus_s(int fan) return ret; } +static int hp_envy_x360_8824_acpi_eval(const char *path, + const unsigned long long *args, + size_t arg_count, + unsigned long long *value) +{ + struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; + union acpi_object params[2] = { }; + struct acpi_object_list input = { .count = arg_count, .pointer = params }; + union acpi_object *obj; + acpi_status status; + size_t i; + + for (i = 0; i < arg_count; i++) { + params[i].type = ACPI_TYPE_INTEGER; + params[i].integer.value = args[i]; + } + + status = acpi_evaluate_object(NULL, (acpi_string)path, + arg_count ? &input : NULL, &output); + if (ACPI_FAILURE(status)) + return -EIO; + + obj = output.pointer; + if (!obj) + return -ENODATA; + + if (obj->type != ACPI_TYPE_INTEGER) { + kfree(obj); + return -EINVAL; + } + + *value = obj->integer.value; + kfree(obj); + + return 0; +} + +static int hp_envy_x360_8824_get_pwm_locked(void) +{ + unsigned long long args[] = { HP_ENVY_8824_FAN_VALUE_ARG }; + unsigned long long value; + int ret; + + ret = hp_envy_x360_8824_acpi_eval(HP_ENVY_8824_ACPI_FANG, args, + ARRAY_SIZE(args), &value); + if (ret) + return ret; + if (value > U8_MAX) + return -EINVAL; + + return value; +} + +static int hp_envy_x360_8824_set_pwm_locked(u8 pwm) +{ + unsigned long long args[] = { + HP_ENVY_8824_FAN_PRIME_ARG, + HP_ENVY_8824_FAN_PRIME_MANUAL, + }; + unsigned long long value; + int ret; + + ret = hp_envy_x360_8824_acpi_eval(HP_ENVY_8824_ACPI_FANW, args, + ARRAY_SIZE(args), &value); + if (ret) + return ret; + + args[0] = HP_ENVY_8824_FAN_VALUE_ARG; + args[1] = pwm; + ret = hp_envy_x360_8824_acpi_eval(HP_ENVY_8824_ACPI_FANW, args, + ARRAY_SIZE(args), &value); + if (ret) + return ret; + + hp_envy_x360_8824_pwm_mode = HP_ENVY_8824_PWM_MODE_MANUAL; + return 0; +} + +static int hp_envy_x360_8824_set_auto_locked(void) +{ + unsigned long long args[] = { + HP_ENVY_8824_FAN_PRIME_ARG, + HP_ENVY_8824_FAN_PRIME_AUTO, + }; + unsigned long long value; + int ret; + + ret = hp_envy_x360_8824_acpi_eval(HP_ENVY_8824_ACPI_FANW, args, + ARRAY_SIZE(args), &value); + if (ret) + return ret; + + args[0] = HP_ENVY_8824_FAN_VALUE_ARG; + args[1] = HP_ENVY_8824_FAN_PRIME_MANUAL; + ret = hp_envy_x360_8824_acpi_eval(HP_ENVY_8824_ACPI_FANW, args, + ARRAY_SIZE(args), &value); + if (ret) + return ret; + + hp_envy_x360_8824_pwm_mode = HP_ENVY_8824_PWM_MODE_AUTO; + return 0; +} + +static int hp_envy_x360_8824_set_manual_locked(void) +{ + int pwm; + + pwm = hp_envy_x360_8824_get_pwm_locked(); + if (pwm < 0) + return pwm; + + return hp_envy_x360_8824_set_pwm_locked(pwm); +} + /* * Calling this hp_wmi_get_fan_count_userdefine_trigger function also enables * and/or maintains the laptop in user defined thermal and fan states, instead @@ -2103,6 +2227,12 @@ static void hp_wmi_rfkill_setup(struct platform_device *device) rfkill_unregister(wifi_rfkill); rfkill_destroy(wifi_rfkill); } + + if (is_envy_x360_8824_board) { + mutex_lock(&hp_envy_x360_8824_fan_lock); + hp_envy_x360_8824_set_auto_locked(); + mutex_unlock(&hp_envy_x360_8824_fan_lock); + } if (bluetooth_rfkill) { rfkill_unregister(bluetooth_rfkill); rfkill_destroy(bluetooth_rfkill); @@ -2176,6 +2306,10 @@ static umode_t hp_wmi_hwmon_is_visible(const void *data, { switch (type) { case hwmon_pwm: + if (attr == hwmon_pwm_input) + return is_envy_x360_8824_board ? 0644 : 0; + if (attr == hwmon_pwm_enable) + return is_envy_x360_8824_board ? 0644 : 0; return 0644; case hwmon_fan: if (is_envy_x360_8824_board) @@ -2213,6 +2347,25 @@ static int hp_wmi_hwmon_read(struct device *dev, enum hwmon_sensor_types type, *val = ret; return 0; case hwmon_pwm: + if (is_envy_x360_8824_board) { + mutex_lock(&hp_envy_x360_8824_fan_lock); + if (attr == hwmon_pwm_input) { + ret = hp_envy_x360_8824_get_pwm_locked(); + if (!ret) + *val = ret; + else if (ret > 0) + *val = ret; + mutex_unlock(&hp_envy_x360_8824_fan_lock); + return ret < 0 ? ret : 0; + } + if (attr == hwmon_pwm_enable) { + *val = hp_envy_x360_8824_pwm_mode; + mutex_unlock(&hp_envy_x360_8824_fan_lock); + return 0; + } + mutex_unlock(&hp_envy_x360_8824_fan_lock); + return -EOPNOTSUPP; + } switch (hp_wmi_fan_speed_max_get()) { case 0: /* 0 is automatic fan, which is 2 for hwmon */ @@ -2236,8 +2389,40 @@ static int hp_wmi_hwmon_read(struct device *dev, enum hwmon_sensor_types type, static int hp_wmi_hwmon_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long val) { + int ret; + switch (type) { case hwmon_pwm: + if (is_envy_x360_8824_board) { + mutex_lock(&hp_envy_x360_8824_fan_lock); + switch (attr) { + case hwmon_pwm_input: + if (val < 0 || val > U8_MAX) { + mutex_unlock(&hp_envy_x360_8824_fan_lock); + return -EINVAL; + } + ret = hp_envy_x360_8824_set_pwm_locked(val); + mutex_unlock(&hp_envy_x360_8824_fan_lock); + return ret; + case hwmon_pwm_enable: + switch (val) { + case HP_ENVY_8824_PWM_MODE_MANUAL: + ret = hp_envy_x360_8824_set_manual_locked(); + break; + case HP_ENVY_8824_PWM_MODE_AUTO: + ret = hp_envy_x360_8824_set_auto_locked(); + break; + default: + ret = -EINVAL; + break; + } + mutex_unlock(&hp_envy_x360_8824_fan_lock); + return ret; + default: + mutex_unlock(&hp_envy_x360_8824_fan_lock); + return -EOPNOTSUPP; + } + } switch (val) { case 0: if (is_victus_s_thermal_profile()) @@ -2262,7 +2447,7 @@ static int hp_wmi_hwmon_write(struct device *dev, enum hwmon_sensor_types type, static const struct hwmon_channel_info * const info[] = { HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT, HWMON_F_INPUT), - HWMON_CHANNEL_INFO(pwm, HWMON_PWM_ENABLE), + HWMON_CHANNEL_INFO(pwm, HWMON_PWM_INPUT | HWMON_PWM_ENABLE), NULL }; -- 2.48.1