From 14c8a1451810cf616c959574bee4fad246f3a0cb Mon Sep 17 00:00:00 2001 From: Szilard Fabian Date: Thu, 15 Feb 2024 20:31:43 +0000 Subject: [PATCH] platform/x86/fujitsu-laptop: Add battery charge control support MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit This patch adds battery charge control support on Fujitsu notebooks via the S006 method of the FUJ02E3 ACPI device. With this method it's possible to set charge_control_end_threshold between 50 and 100%. Tested on Lifebook E5411 and Lifebook U728. Sadly I can't test this patch on a dual battery one, but I didn't find any clue about independent battery charge control on dual battery Fujitsu notebooks either. And by that I mean checking the DSDT table of various Lifebook notebooks and reverse engineering FUJ02E3.dll. Signed-off-by: Szilard Fabian Acked-by: Jonathan Woithe Link: https://lore.kernel.org/r/20240215203012.228758-2-szfabian@bluemarch.art [ij: coding style cleanups.] Reviewed-by: Ilpo Järvinen Signed-off-by: Ilpo Järvinen --- drivers/platform/x86/Kconfig | 1 + drivers/platform/x86/fujitsu-laptop.c | 117 ++++++++++++++++++++++++++ 2 files changed, 118 insertions(+) diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 6dbd40e2aeda2..7e9251fc33416 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -370,6 +370,7 @@ config FUJITSU_LAPTOP depends on ACPI depends on INPUT depends on BACKLIGHT_CLASS_DEVICE + depends on ACPI_BATTERY depends on ACPI_VIDEO || ACPI_VIDEO = n select INPUT_SPARSEKMAP select NEW_LEDS diff --git a/drivers/platform/x86/fujitsu-laptop.c b/drivers/platform/x86/fujitsu-laptop.c index 085e044e888e4..94480af494678 100644 --- a/drivers/platform/x86/fujitsu-laptop.c +++ b/drivers/platform/x86/fujitsu-laptop.c @@ -49,6 +49,8 @@ #include #include #include +#include +#include #include #define FUJITSU_DRIVER_VERSION "0.6.0" @@ -97,6 +99,10 @@ #define BACKLIGHT_OFF (BIT(0) | BIT(1)) #define BACKLIGHT_ON 0 +/* FUNC interface - battery control interface */ +#define FUNC_S006_METHOD 0x1006 +#define CHARGE_CONTROL_RW 0x21 + /* Scancodes read from the GIRB register */ #define KEY1_CODE 0x410 #define KEY2_CODE 0x411 @@ -132,6 +138,7 @@ struct fujitsu_laptop { spinlock_t fifo_lock; int flags_supported; int flags_state; + bool charge_control_supported; }; static struct acpi_device *fext; @@ -164,6 +171,110 @@ static int call_fext_func(struct acpi_device *device, return value; } +/* Battery charge control code */ +static ssize_t charge_control_end_threshold_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + int cc_end_value, s006_cc_return; + int value, ret; + + ret = kstrtouint(buf, 10, &value); + if (ret) + return ret; + + if (value < 50 || value > 100) + return -EINVAL; + + cc_end_value = value * 0x100 + 0x20; + s006_cc_return = call_fext_func(fext, FUNC_S006_METHOD, + CHARGE_CONTROL_RW, cc_end_value, 0x0); + if (s006_cc_return < 0) + return s006_cc_return; + /* + * The S006 0x21 method returns 0x00 in case the provided value + * is invalid. + */ + if (s006_cc_return == 0x00) + return -EINVAL; + + return count; +} + +static ssize_t charge_control_end_threshold_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int status; + + status = call_fext_func(fext, FUNC_S006_METHOD, + CHARGE_CONTROL_RW, 0x21, 0x0); + if (status < 0) + return status; + + return sysfs_emit(buf, "%d\n", status); +} + +static DEVICE_ATTR_RW(charge_control_end_threshold); + +/* ACPI battery hook */ +static int fujitsu_battery_add_hook(struct power_supply *battery, + struct acpi_battery_hook *hook) +{ + return device_create_file(&battery->dev, + &dev_attr_charge_control_end_threshold); +} + +static int fujitsu_battery_remove_hook(struct power_supply *battery, + struct acpi_battery_hook *hook) +{ + device_remove_file(&battery->dev, + &dev_attr_charge_control_end_threshold); + + return 0; +} + +static struct acpi_battery_hook battery_hook = { + .add_battery = fujitsu_battery_add_hook, + .remove_battery = fujitsu_battery_remove_hook, + .name = "Fujitsu Battery Extension", +}; + +/* + * These functions are intended to be called from acpi_fujitsu_laptop_add and + * acpi_fujitsu_laptop_remove. + */ +static int fujitsu_battery_charge_control_add(struct acpi_device *device) +{ + struct fujitsu_laptop *priv = acpi_driver_data(device); + int s006_cc_return; + + priv->charge_control_supported = false; + /* + * Check if the S006 0x21 method exists by trying to get the current + * battery charge limit. + */ + s006_cc_return = call_fext_func(fext, FUNC_S006_METHOD, + CHARGE_CONTROL_RW, 0x21, 0x0); + if (s006_cc_return < 0) + return s006_cc_return; + if (s006_cc_return == UNSUPPORTED_CMD) + return -ENODEV; + + priv->charge_control_supported = true; + battery_hook_register(&battery_hook); + + return 0; +} + +static void fujitsu_battery_charge_control_remove(struct acpi_device *device) +{ + struct fujitsu_laptop *priv = acpi_driver_data(device); + + if (priv->charge_control_supported) + battery_hook_unregister(&battery_hook); +} + /* Hardware access for LCD brightness control */ static int set_lcd_level(struct acpi_device *device, int level) @@ -839,6 +950,10 @@ static int acpi_fujitsu_laptop_add(struct acpi_device *device) if (ret) goto err_free_fifo; + ret = fujitsu_battery_charge_control_add(device); + if (ret < 0) + pr_warn("Unable to register battery charge control: %d\n", ret); + return 0; err_free_fifo: @@ -851,6 +966,8 @@ static void acpi_fujitsu_laptop_remove(struct acpi_device *device) { struct fujitsu_laptop *priv = acpi_driver_data(device); + fujitsu_battery_charge_control_remove(device); + fujitsu_laptop_platform_remove(device); kfifo_free(&priv->fifo); -- 2.30.2