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 <szfabian@xxxxxxxxxxxxx> --- v2: Forgot to sign-off the original commit. Fixed, sorry for the inconvenience. --- drivers/platform/x86/fujitsu-laptop.c | 95 +++++++++++++++++++++++++++ 1 file changed, 95 insertions(+) diff --git a/drivers/platform/x86/fujitsu-laptop.c b/drivers/platform/x86/fujitsu-laptop.c index 085e044e888e..bf3df74e4d63 100644 --- a/drivers/platform/x86/fujitsu-laptop.c +++ b/drivers/platform/x86/fujitsu-laptop.c @@ -49,6 +49,8 @@ #include <linux/kfifo.h> #include <linux/leds.h> #include <linux/platform_device.h> +#include <linux/power_supply.h> +#include <acpi/battery.h> #include <acpi/video.h> #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 @@ -164,6 +170,91 @@ 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 value, ret; + + ret = kstrtouint(buf, 10, &value); + if (ret) + return ret; + + if (value < 50 || value > 100) + return -EINVAL; + + int cc_end_value, s006_cc_return; + + cc_end_value = value * 0x100 + 0x20; + s006_cc_return = call_fext_func(fext, FUNC_S006_METHOD, + CHARGE_CONTROL_RW, cc_end_value, 0x0); + + /* + * 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); + + return sprintf(buf, "%d\n", status); +} + +static DEVICE_ATTR_RW(charge_control_end_threshold); + +/* ACPI battery hook */ + +static int fujitsu_battery_add(struct power_supply *battery, + struct acpi_battery_hook *hook) +{ + /* Check if there is an existing FUJ02E3 ACPI device. */ + if (fext == NULL) + return -ENODEV; + + /* + * Check if the S006 0x21 method exists by trying to get the current + * battery charge limit. + */ + int s006_cc_return; + s006_cc_return = call_fext_func(fext, FUNC_S006_METHOD, + CHARGE_CONTROL_RW, 0x21, 0x0); + if (s006_cc_return == UNSUPPORTED_CMD) + return -ENODEV; + + if (device_create_file(&battery->dev, + &dev_attr_charge_control_end_threshold)) + return -ENODEV; + + return 0; +} + +static int fujitsu_battery_remove(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, + .remove_battery = fujitsu_battery_remove, + .name = "Fujitsu Battery Extension", +}; + /* Hardware access for LCD brightness control */ static int set_lcd_level(struct acpi_device *device, int level) @@ -839,6 +930,8 @@ static int acpi_fujitsu_laptop_add(struct acpi_device *device) if (ret) goto err_free_fifo; + battery_hook_register(&battery_hook); + return 0; err_free_fifo: @@ -851,6 +944,8 @@ static void acpi_fujitsu_laptop_remove(struct acpi_device *device) { struct fujitsu_laptop *priv = acpi_driver_data(device); + battery_hook_unregister(&battery_hook); + fujitsu_laptop_platform_remove(device); kfifo_free(&priv->fifo); -- 2.43.0