--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * huawei-gaokun-battery - A power supply driver for HUAWEI Matebook E Go
+ *
+ * Copyright (C) 2024 Pengyu Luo <mitltlatltl@gmail.com>
+ */
+
+#include <linux/auxiliary_bus.h>
+#include <linux/bits.h>
+#include <linux/delay.h>
+#include <linux/jiffies.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/platform_data/huawei-gaokun-ec.h>
+#include <linux/power_supply.h>
+#include <linux/sprintf.h>
+
+/* -------------------------------------------------------------------------- */
+/* String Data Reg */
+
+#define EC_BAT_VENDOR 0x01 /* from 0x01 to 0x0F, SUNWODA */
+#define EC_BAT_MODEL 0x11 /* from 0x11 to 0x1F, HB30A8P9ECW-22T */
+
+#define EC_ADP_STATUS 0x81
+#define EC_AC_STATUS BIT(0)
+#define EC_BAT_PRESENT BIT(1) /* BATC._STA */
+
+#define EC_BAT_STATUS 0x82 /* _BST */
+#define EC_BAT_DISCHARGING BIT(0)
+#define EC_BAT_CHARGING BIT(1)
+#define EC_BAT_CRITICAL BIT(2) /* Low Battery Level */
+#define EC_BAT_FULL BIT(3)
+
+/* -------------------------------------------------------------------------- */
+/* Word Data Reg */
+
+/* 0x5A: ?
+ * 0x5C: ?
+ * 0x5E: ?
+ * 0X60: ?
+ * 0x84: ?
+ */
+
+#define EC_BAT_STATUS_START 0x90
+#define EC_BAT_PERCENTAGE 0x90
+#define EC_BAT_VOLTAGE 0x92
+#define EC_BAT_CAPACITY 0x94
+#define EC_BAT_FULL_CAPACITY 0x96
+/* 0x98: ? */
+#define EC_BAT_CURRENT 0x9A
+/* 0x9C: ? */
+
+#define EC_BAT_INFO_START 0xA0
+/* 0xA0: POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT? */
+#define EC_BAT_DESIGN_CAPACITY 0xA2
+#define EC_BAT_DESIGN_VOLTAGE 0xA4
+#define EC_BAT_SERIAL_NUMBER 0xA6
+#define EC_BAT_CYCLE_COUNT 0xAA
+
+/* -------------------------------------------------------------------------- */
+/* Battery Event ID */
+
+#define EC_EVENT_BAT_A0 0xA0
+#define EC_EVENT_BAT_A1 0xA1
+#define EC_EVENT_BAT_A2 0xA2
+#define EC_EVENT_BAT_A3 0xA3
+#define EC_EVENT_BAT_B1 0xB1
+/* EVENT B1 A0 A1 repeat about every 1s 2s 3s respectively */
+
+/* ACPI _BIX field, Min sampling time, the duration between two _BST */
+#define CACHE_TIME 2000 /* cache time in milliseconds */
+
+#define MILLI_TO_MICRO 1000
+
+#define SMART_CHARGE_MODE 0
+#define SMART_CHARGE_DELAY 1
+#define SMART_CHARGE_START 2
+#define SMART_CHARGE_END 3
+
+#define NO_DELAY_MODE 1
+#define DELAY_MODE 4
+
+struct gaokun_psy_bat_status {
+ __le16 percentage_now; /* 0x90 */
+ __le16 voltage_now;
+ __le16 capacity_now;
+ __le16 full_capacity;
+ __le16 unknown1;
+ __le16 rate_now;
+ __le16 unknown2; /* 0x9C */
+} __packed;
+
+struct gaokun_psy_bat_info {
+ __le16 unknown3; /* 0xA0 */
+ __le16 design_capacity;
+ __le16 design_voltage;
+ __le16 serial_number;
+ __le16 padding2;
+ __le16 cycle_count; /* 0xAA */
+} __packed;
+
+struct gaokun_psy {
+ struct gaokun_ec *ec;
+ struct device *dev;
+ struct notifier_block nb;
+
+ struct power_supply *bat_psy;
+ struct power_supply *adp_psy;
+
+ unsigned long update_time;
+ struct gaokun_psy_bat_status status;
+ struct gaokun_psy_bat_info info;
+
+ char battery_model[0x10]; /* HB30A8P9ECW-22T, the real one is XXX-22A */
+ char battery_serial[0x10];
+ char battery_vendor[0x10];
+
+ int charge_now;
+ int online;
+ int bat_present;
+};
+
+/* -------------------------------------------------------------------------- */
+/* Adapter */
+
+static int gaokun_psy_get_adp_status(struct gaokun_psy *ecbat)
+{
+ /* _PSR */
+ int ret;
+ u8 online;
+
+ ret = gaokun_ec_psy_read_byte(ecbat->ec, EC_ADP_STATUS, &online);
+ if (ret)
+ return ret;
+
+ ecbat->online = !!(online & EC_AC_STATUS);
+
+ return 0;
+}
+
+static int gaokun_psy_get_adp_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct gaokun_psy *ecbat = power_supply_get_drvdata(psy);
+ int ret;
+
+ ret = gaokun_psy_get_adp_status(ecbat);
+ if (ret)
+ return ret;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = ecbat->online;
+ break;
+ case POWER_SUPPLY_PROP_USB_TYPE:
+ val->intval = POWER_SUPPLY_USB_TYPE_C;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static enum power_supply_property gaokun_psy_adp_props[] = {
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_USB_TYPE,
+};
+
+static const struct power_supply_desc gaokun_psy_adp_desc = {
+ .name = "gaokun-ec-adapter",
+ .type = POWER_SUPPLY_TYPE_USB,
+ .usb_types = BIT(POWER_SUPPLY_USB_TYPE_C),
+ .get_property = gaokun_psy_get_adp_property,
+ .properties = gaokun_psy_adp_props,
+ .num_properties = ARRAY_SIZE(gaokun_psy_adp_props),
+};
+
+/* -------------------------------------------------------------------------- */
+/* Battery */
+
+static inline void gaokun_psy_get_bat_present(struct gaokun_psy *ecbat)
+{
+ int ret;
+ u8 present;
+
+ /* Some kind of initialization */
+ gaokun_ec_write(ecbat->ec, (u8 []){0x02, 0xB2, 1, 0x90});
+
+ ret = gaokun_ec_psy_read_byte(ecbat->ec, EC_ADP_STATUS, &present);
+
+ ecbat->bat_present = ret ? false : !!(present & EC_BAT_PRESENT);
+}
+
+static inline int gaokun_psy_bat_present(struct gaokun_psy *ecbat)
+{
+ return ecbat->bat_present;
+}
+
+static int gaokun_psy_get_bat_info(struct gaokun_psy *ecbat)
+{
+ /* _BIX */
+ if (!gaokun_psy_bat_present(ecbat))
+ return 0;
+
+ return gaokun_ec_psy_multi_read(ecbat->ec, EC_BAT_INFO_START,
+ sizeof(ecbat->info), (u8 *)&ecbat->info);
+}
+
+static void gaokun_psy_update_bat_charge(struct gaokun_psy *ecbat)
+{
+ u8 charge;
+
+ gaokun_ec_psy_read_byte(ecbat->ec, EC_BAT_STATUS, &charge);
+
+ switch (charge) {
+ case EC_BAT_CHARGING:
+ ecbat->charge_now = POWER_SUPPLY_STATUS_CHARGING;
+ break;
+ case EC_BAT_DISCHARGING:
+ ecbat->charge_now = POWER_SUPPLY_STATUS_DISCHARGING;
+ break;
+ case EC_BAT_FULL:
+ ecbat->charge_now = POWER_SUPPLY_STATUS_FULL;
+ break;
+ default:
+ dev_warn(ecbat->dev, "unknown charge state %d\n", charge);
+ }
+}
+
+static int gaokun_psy_get_bat_status(struct gaokun_psy *ecbat)
+{
+ /* _BST */
+ int ret;
+
+ if (time_before(jiffies, ecbat->update_time +
+ msecs_to_jiffies(CACHE_TIME)))
+ return 0;
+
+ gaokun_psy_update_bat_charge(ecbat);
+ ret = gaokun_ec_psy_multi_read(ecbat->ec, EC_BAT_STATUS_START,
+ sizeof(ecbat->status), (u8 *)&ecbat->status);
+
+ ecbat->update_time = jiffies;
+
+ return ret;
+}
+
+static void gaokun_psy_init(struct gaokun_psy *ecbat)
+{
+ gaokun_psy_get_bat_present(ecbat);
+ if (!gaokun_psy_bat_present(ecbat))
+ return;
+
+ gaokun_psy_get_bat_info(ecbat);
+
+ snprintf(ecbat->battery_serial, sizeof(ecbat->battery_serial),
+ "%d", le16_to_cpu(ecbat->info.serial_number));
+
+ gaokun_ec_psy_multi_read(ecbat->ec, EC_BAT_VENDOR,
+ sizeof(ecbat->battery_vendor) - 1,
+ ecbat->battery_vendor);
+
+ gaokun_ec_psy_multi_read(ecbat->ec, EC_BAT_MODEL,
+ sizeof(ecbat->battery_model) - 1,
+ ecbat->battery_model);
+
+ ecbat->battery_model[14] = 'A'; /* FIX UP */
+}
+
+static int gaokun_psy_get_bat_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct gaokun_psy *ecbat = power_supply_get_drvdata(psy);
+ u8 buf[GAOKUN_SMART_CHARGE_DATA_SIZE];
+ int ret;
+
+ if (gaokun_psy_bat_present(ecbat))
+ gaokun_psy_get_bat_status(ecbat);
+ else if (psp != POWER_SUPPLY_PROP_PRESENT)
+ return -ENODEV;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ val->intval = ecbat->charge_now;
+ break;
+
+ case POWER_SUPPLY_PROP_PRESENT:
+ val->intval = ecbat->bat_present;
+ break;
+
+ case POWER_SUPPLY_PROP_TECHNOLOGY:
+ val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
+ break;
+
+ case POWER_SUPPLY_PROP_CYCLE_COUNT:
+ val->intval = le16_to_cpu(ecbat->info.cycle_count);
+ break;
+
+ case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+ val->intval = le16_to_cpu(ecbat->info.design_voltage) * MILLI_TO_MICRO;
+ break;
+
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ val->intval = le16_to_cpu(ecbat->status.voltage_now) * MILLI_TO_MICRO;
+ break;
+
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ val->intval = (s16)le16_to_cpu(ecbat->status.rate_now) * MILLI_TO_MICRO;
+ break;
+
+ case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+ val->intval = le16_to_cpu(ecbat->info.design_capacity) * MILLI_TO_MICRO;
+ break;
+
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ val->intval = le16_to_cpu(ecbat->status.full_capacity) * MILLI_TO_MICRO;
+ break;
+
+ case POWER_SUPPLY_PROP_CHARGE_NOW:
+ val->intval = le16_to_cpu(ecbat->status.capacity_now) * MILLI_TO_MICRO;
+ break;
+
+ case POWER_SUPPLY_PROP_CHARGE_CONTROL_START_THRESHOLD:
+ case POWER_SUPPLY_PROP_CHARGE_CONTROL_END_THRESHOLD:
+ ret = gaokun_ec_psy_get_smart_charge(ecbat->ec, buf);
+ if (ret)
+ return ret;
+
+ if (psp == POWER_SUPPLY_PROP_CHARGE_CONTROL_START_THRESHOLD)
+ val->intval = buf[SMART_CHARGE_START];
+ else
+ val->intval = buf[SMART_CHARGE_END];
+ break;
+
+ case POWER_SUPPLY_PROP_CAPACITY:
+ val->intval = le16_to_cpu(ecbat->status.percentage_now);
+ break;
+
+ case POWER_SUPPLY_PROP_MODEL_NAME:
+ val->strval = ecbat->battery_model;
+ break;
+
+ case POWER_SUPPLY_PROP_MANUFACTURER:
+ val->strval = ecbat->battery_vendor;
+ break;
+
+ case POWER_SUPPLY_PROP_SERIAL_NUMBER:
+ val->strval = ecbat->battery_serial;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int gaokun_psy_set_bat_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ const union power_supply_propval *val)
+{
+ struct gaokun_psy *ecbat = power_supply_get_drvdata(psy);
+ u8 buf[GAOKUN_SMART_CHARGE_DATA_SIZE];
+ int ret;
+
+ if (!gaokun_psy_bat_present(ecbat))
+ return -ENODEV;
+
+ ret = gaokun_ec_psy_get_smart_charge(ecbat->ec, buf);
+ if (ret)
+ return ret;
+
+ switch (psp) {
+ /*
+ * Resetting another thershold makes single thersold setting more likely
+ * to succeed. But setting start = end makes thing strange(failure).
+ */
+ case POWER_SUPPLY_PROP_CHARGE_CONTROL_START_THRESHOLD:
+ buf[SMART_CHARGE_START] = val->intval;
+ if (buf[SMART_CHARGE_START] > buf[SMART_CHARGE_END])
+ buf[SMART_CHARGE_END] = buf[SMART_CHARGE_START] + 1;
+ return gaokun_ec_psy_set_smart_charge(ecbat->ec, buf);
+
+ case POWER_SUPPLY_PROP_CHARGE_CONTROL_END_THRESHOLD:
+ buf[SMART_CHARGE_END] = val->intval;
+ if (buf[SMART_CHARGE_END] < buf[SMART_CHARGE_START])
+ buf[SMART_CHARGE_START] = buf[SMART_CHARGE_END] - 1;
+ return gaokun_ec_psy_set_smart_charge(ecbat->ec, buf);
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int gaokun_psy_is_bat_property_writeable(struct power_supply *psy,
+ enum power_supply_property psp)
+{
+ return psp == POWER_SUPPLY_PROP_CHARGE_CONTROL_START_THRESHOLD ||
+ psp == POWER_SUPPLY_PROP_CHARGE_CONTROL_END_THRESHOLD;
+}
+
+static enum power_supply_property gaokun_psy_bat_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+ POWER_SUPPLY_PROP_CYCLE_COUNT,
+ POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+ POWER_SUPPLY_PROP_CHARGE_FULL,
+ POWER_SUPPLY_PROP_CHARGE_NOW,
+ POWER_SUPPLY_PROP_CHARGE_CONTROL_START_THRESHOLD,
+ POWER_SUPPLY_PROP_CHARGE_CONTROL_END_THRESHOLD,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_MODEL_NAME,
+ POWER_SUPPLY_PROP_MANUFACTURER,
+ POWER_SUPPLY_PROP_SERIAL_NUMBER,
+};
+
+static const struct power_supply_desc gaokun_psy_bat_desc = {
+ .name = "gaokun-ec-battery",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .get_property = gaokun_psy_get_bat_property,
+ .set_property = gaokun_psy_set_bat_property,
+ .property_is_writeable = gaokun_psy_is_bat_property_writeable,
+ .properties = gaokun_psy_bat_props,
+ .num_properties = ARRAY_SIZE(gaokun_psy_bat_props),
+};
+
+/* -------------------------------------------------------------------------- */
+/* Sysfs */
+
+/*
+ * Note that, HUAWEI calls them SBAC/GBAC and SBCM/GBCM in DSDT, they are likely
+ * Set/Get Battery Adaptive Charging and Set/Get Battery Charging Mode.
+ */
+
+/* battery adaptive charge */
+static ssize_t battery_adaptive_charge_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct power_supply *psy = to_power_supply(dev);
+ struct gaokun_psy *ecbat = power_supply_get_drvdata(psy);
+ int ret;
+ bool on;
+
+ ret = gaokun_ec_psy_get_smart_charge_enable(ecbat->ec, &on);
+ if (ret)
+ return ret;
+
+ return sysfs_emit(buf, "%d\n", on);
+}
+
+static ssize_t battery_adaptive_charge_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ struct power_supply *psy = to_power_supply(dev);
+ struct gaokun_psy *ecbat = power_supply_get_drvdata(psy);
+ int ret;
+ bool on;
+
+ if (kstrtobool(buf, &on))
+ return -EINVAL;
+
+ ret = gaokun_ec_psy_set_smart_charge_enable(ecbat->ec, on);
+ if (ret)
+ return ret;
+
+ return size;
+}
+
+static DEVICE_ATTR_RW(battery_adaptive_charge);
+
+static inline int get_charge_delay(u8 buf[GAOKUN_SMART_CHARGE_DATA_SIZE])
+{
+ return buf[SMART_CHARGE_MODE] == NO_DELAY_MODE ? 0 : buf[SMART_CHARGE_DELAY];
+}
+
+static inline void
+set_charge_delay(u8 buf[GAOKUN_SMART_CHARGE_DATA_SIZE], u8 delay)
+{
+ if (delay) {
+ buf[SMART_CHARGE_DELAY] = delay;
+ buf[SMART_CHARGE_MODE] = DELAY_MODE;
+ } else {
+ /* No writing zero, there is a specific mode for it. */
+ buf[SMART_CHARGE_MODE] = NO_DELAY_MODE;
+ }
+}
+
+/* Smart charge */
+static ssize_t smart_charge_delay_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct power_supply *psy = to_power_supply(dev);
+ struct gaokun_psy *ecbat = power_supply_get_drvdata(psy);
+ u8 bf[GAOKUN_SMART_CHARGE_DATA_SIZE];
+ int ret;
+
+ ret = gaokun_ec_psy_get_smart_charge(ecbat->ec, bf);
+ if (ret)
+ return ret;
+
+ return sysfs_emit(buf, "%d\n", get_charge_delay(bf));
+}
+
+static ssize_t smart_charge_delay_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ struct power_supply *psy = to_power_supply(dev);
+ struct gaokun_psy *ecbat = power_supply_get_drvdata(psy);
+ u8 bf[GAOKUN_SMART_CHARGE_DATA_SIZE];
+ u8 delay;
+ int ret;
+
+ if (kstrtou8(buf, 10, &delay))
+ return -EINVAL;
+
+ ret = gaokun_ec_psy_get_smart_charge(ecbat->ec, bf);
+ if (ret)
+ return ret;
+
+ set_charge_delay(bf, delay);
+
+ ret = gaokun_ec_psy_set_smart_charge(ecbat->ec, bf);
+ if (ret)
+ return ret;
+
+ return size;
+}
+
+static DEVICE_ATTR_RW(smart_charge_delay);
+
+static struct attribute *gaokun_psy_features_attrs[] = {
+ &dev_attr_battery_adaptive_charge.attr,
+ &dev_attr_smart_charge_delay.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(gaokun_psy_features);
+
+static int gaokun_psy_notify(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct gaokun_psy *ecbat = container_of(nb, struct gaokun_psy, nb);
+
+ switch (action) {
+ case EC_EVENT_BAT_A2:
+ case EC_EVENT_BAT_B1:
+ gaokun_psy_get_bat_info(ecbat);
+ return NOTIFY_OK;
+
+ case EC_EVENT_BAT_A0:
+ gaokun_psy_get_adp_status(ecbat);
+ power_supply_changed(ecbat->adp_psy);
+ msleep(10);
+ fallthrough;
+
+ case EC_EVENT_BAT_A1:
+ case EC_EVENT_BAT_A3:
+ if (action == EC_EVENT_BAT_A3) {
+ gaokun_psy_get_bat_info(ecbat);
+ msleep(100);
+ }
+ gaokun_psy_get_bat_status(ecbat);
+ power_supply_changed(ecbat->bat_psy);
+ return NOTIFY_OK;
+
+ default:
+ return NOTIFY_DONE;
+ }
+}
+
+static int gaokun_psy_probe(struct auxiliary_device *adev,
+ const struct auxiliary_device_id *id)
+{
+ struct gaokun_ec *ec = adev->dev.platform_data;
+ struct power_supply_config psy_cfg = {};
+ struct device *dev = &adev->dev;
+ struct gaokun_psy *ecbat;
+
+ ecbat = devm_kzalloc(&adev->dev, sizeof(*ecbat), GFP_KERNEL);
+ if (!ecbat)
+ return -ENOMEM;
+
+ ecbat->ec = ec;
+ ecbat->dev = dev;
+ ecbat->nb.notifier_call = gaokun_psy_notify;
+
+ auxiliary_set_drvdata(adev, ecbat);
+
+ psy_cfg.drv_data = ecbat;
+ ecbat->adp_psy = devm_power_supply_register(dev, &gaokun_psy_adp_desc,
+ &psy_cfg);
+ if (IS_ERR(ecbat->adp_psy))
+ return dev_err_probe(dev, PTR_ERR(ecbat->adp_psy),
+ "Failed to register AC power supply\n");
+
+ psy_cfg.supplied_to = (char **)&gaokun_psy_bat_desc.name;
+ psy_cfg.num_supplicants = 1;
+ psy_cfg.no_wakeup_source = true;
+ psy_cfg.attr_grp = gaokun_psy_features_groups;
+ ecbat->bat_psy = devm_power_supply_register(dev, &gaokun_psy_bat_desc,
+ &psy_cfg);
+ if (IS_ERR(ecbat->bat_psy))
+ return dev_err_probe(dev, PTR_ERR(ecbat->bat_psy),
+ "Failed to register battery power supply\n");
+ gaokun_psy_init(ecbat);
+
+ return gaokun_ec_register_notify(ec, &ecbat->nb);
+}
+
+static void gaokun_psy_remove(struct auxiliary_device *adev)
+{
+ struct gaokun_psy *ecbat = auxiliary_get_drvdata(adev);
+
+ gaokun_ec_unregister_notify(ecbat->ec, &ecbat->nb);
+}
+
+static const struct auxiliary_device_id gaokun_psy_id_table[] = {
+ { .name = GAOKUN_MOD_NAME "." GAOKUN_DEV_PSY, },
+ {}
+};
+MODULE_DEVICE_TABLE(auxiliary, gaokun_psy_id_table);
+
+static struct auxiliary_driver gaokun_psy_driver = {
+ .name = GAOKUN_DEV_PSY,
+ .id_table = gaokun_psy_id_table,
+ .probe = gaokun_psy_probe,
+ .remove = gaokun_psy_remove,
+};
+
+module_auxiliary_driver(gaokun_psy_driver);
+
+MODULE_DESCRIPTION("HUAWEI Matebook E Go psy driver");
+MODULE_LICENSE("GPL");
projects / thirdparty / kernel / linux.git / commitdiff
