diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/platform/x86/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/platform/x86/huawei-wmi.c | 212 |
2 files changed, 213 insertions, 0 deletions
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 754405e19ef1..e64103789885 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -1306,6 +1306,7 @@ config INTEL_ATOMISP2_PM config HUAWEI_WMI tristate "Huawei WMI laptop extras driver" + depends on ACPI_BATTERY depends on ACPI_WMI depends on INPUT select INPUT_SPARSEKMAP diff --git a/drivers/platform/x86/huawei-wmi.c b/drivers/platform/x86/huawei-wmi.c index 41904b1cc284..6e791f9ffc26 100644 --- a/drivers/platform/x86/huawei-wmi.c +++ b/drivers/platform/x86/huawei-wmi.c @@ -6,6 +6,7 @@ */ #include <linux/acpi.h> +#include <linux/delay.h> #include <linux/dmi.h> #include <linux/input.h> #include <linux/input/sparse-keymap.h> @@ -13,7 +14,10 @@ #include <linux/module.h> #include <linux/mutex.h> #include <linux/platform_device.h> +#include <linux/power_supply.h> +#include <linux/sysfs.h> #include <linux/wmi.h> +#include <acpi/battery.h> /* * Huawei WMI GUIDs @@ -49,10 +53,13 @@ struct quirk_entry { static struct quirk_entry *quirks; struct huawei_wmi { + bool battery_available; + struct input_dev *idev[2]; struct led_classdev cdev; struct platform_device *pdev; + struct mutex battery_lock; struct mutex wmi_lock; }; @@ -300,6 +307,208 @@ static void huawei_wmi_leds_setup(struct device *dev) devm_led_classdev_register(dev, &huawei->cdev); } +/* Battery protection */ + +static int huawei_wmi_battery_get(int *start, int *end) +{ + u8 ret[0x100]; + int err, i; + + err = huawei_wmi_cmd(BATTERY_THRESH_GET, ret, 0x100); + if (err) + return err; + + /* Find the last two non-zero values. Return status is ignored. */ + i = 0xff; + do { + if (start) + *start = ret[i-1]; + if (end) + *end = ret[i]; + } while (i > 2 && !ret[i--]); + + return 0; +} + +static int huawei_wmi_battery_set(int start, int end) +{ + union hwmi_arg arg; + int err; + + if (start < 0 || end > 100) + return -EINVAL; + + arg.cmd = BATTERY_THRESH_SET; + arg.args[2] = start; + arg.args[3] = end; + + /* This is an edge case were some models turn battery protection + * off without changing their thresholds values. We clear the + * values before turning off protection. Sometimes we need a sleep delay to + * make sure these values make their way to EC memory. + */ + if (quirks && quirks->battery_reset && start == 0 && end == 100) { + err = huawei_wmi_battery_set(0, 0); + if (err) + return err; + + msleep(1000); + } + + err = huawei_wmi_cmd(arg.cmd, NULL, 0); + + return err; +} + +static ssize_t charge_control_start_threshold_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int err, start; + + err = huawei_wmi_battery_get(&start, NULL); + if (err) + return err; + + return sprintf(buf, "%d\n", start); +} + +static ssize_t charge_control_end_threshold_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int err, end; + + err = huawei_wmi_battery_get(NULL, &end); + if (err) + return err; + + return sprintf(buf, "%d\n", end); +} + +static ssize_t charge_control_thresholds_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int err, start, end; + + err = huawei_wmi_battery_get(&start, &end); + if (err) + return err; + + return sprintf(buf, "%d %d\n", start, end); +} + +static ssize_t charge_control_start_threshold_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + int err, start, end; + + err = huawei_wmi_battery_get(NULL, &end); + if (err) + return err; + + if (sscanf(buf, "%d", &start) != 1) + return -EINVAL; + + err = huawei_wmi_battery_set(start, end); + if (err) + return err; + + return size; +} + +static ssize_t charge_control_end_threshold_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + int err, start, end; + + err = huawei_wmi_battery_get(&start, NULL); + if (err) + return err; + + if (sscanf(buf, "%d", &end) != 1) + return -EINVAL; + + err = huawei_wmi_battery_set(start, end); + if (err) + return err; + + return size; +} + +static ssize_t charge_control_thresholds_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + int err, start, end; + + if (sscanf(buf, "%d %d", &start, &end) != 2) + return -EINVAL; + + err = huawei_wmi_battery_set(start, end); + if (err) + return err; + + return size; +} + +static DEVICE_ATTR_RW(charge_control_start_threshold); +static DEVICE_ATTR_RW(charge_control_end_threshold); +static DEVICE_ATTR_RW(charge_control_thresholds); + +static int huawei_wmi_battery_add(struct power_supply *battery) +{ + /* Huawei laptops come with one battery only */ + if (strcmp(battery->desc->name, "BAT") != 1) + return -ENODEV; + + device_create_file(&battery->dev, &dev_attr_charge_control_start_threshold); + device_create_file(&battery->dev, &dev_attr_charge_control_end_threshold); + + return 0; +} + +static int huawei_wmi_battery_remove(struct power_supply *battery) +{ + device_remove_file(&battery->dev, &dev_attr_charge_control_start_threshold); + device_remove_file(&battery->dev, &dev_attr_charge_control_end_threshold); + + return 0; +} + +static struct acpi_battery_hook huawei_wmi_battery_hook = { + .add_battery = huawei_wmi_battery_add, + .remove_battery = huawei_wmi_battery_remove, + .name = "Huawei Battery Extension" +}; + +static void huawei_wmi_battery_setup(struct device *dev) +{ + struct huawei_wmi *huawei = dev_get_drvdata(dev); + + huawei->battery_available = true; + if (huawei_wmi_battery_get(NULL, NULL)) { + huawei->battery_available = false; + return; + } + + battery_hook_register(&huawei_wmi_battery_hook); + device_create_file(dev, &dev_attr_charge_control_thresholds); +} + +static void huawei_wmi_battery_exit(struct device *dev) +{ + struct huawei_wmi *huawei = dev_get_drvdata(dev); + + if (huawei->battery_available) { + battery_hook_unregister(&huawei_wmi_battery_hook); + device_remove_file(dev, &dev_attr_charge_control_thresholds); + } +} + /* Input */ static void huawei_wmi_process_key(struct input_dev *idev, int code) @@ -420,8 +629,10 @@ static int huawei_wmi_probe(struct platform_device *pdev) if (wmi_has_guid(HWMI_METHOD_GUID)) { mutex_init(&huawei_wmi->wmi_lock); + mutex_init(&huawei_wmi->battery_lock); huawei_wmi_leds_setup(&pdev->dev); + huawei_wmi_battery_setup(&pdev->dev); } return 0; @@ -439,6 +650,7 @@ static int huawei_wmi_remove(struct platform_device *pdev) } if (wmi_has_guid(HWMI_METHOD_GUID)) { + huawei_wmi_battery_exit(&pdev->dev); } return 0; |