@@ -6,11 +6,15 @@
*/
#include <linux/hid.h>
+#include <linux/idr.h>
#include <linux/input-event-codes.h>
#include <linux/input.h>
+#include <linux/jiffies.h>
#include <linux/leds.h>
#include <linux/module.h>
+#include <linux/power_supply.h>
#include <linux/spinlock.h>
+#include <linux/timer.h>
#include <linux/workqueue.h>
#include "hid-ids.h"
@@ -30,6 +34,8 @@ enum {
enum {
SHIELD_FW_VERSION_INITIALIZED = 0,
SHIELD_BOARD_INFO_INITIALIZED,
+ SHIELD_BATTERY_STATS_INITIALIZED,
+ SHIELD_CHARGER_STATE_INITIALIZED,
};
enum {
@@ -37,6 +43,7 @@ enum {
THUNDERSTRIKE_BOARD_INFO_UPDATE,
THUNDERSTRIKE_HAPTICS_UPDATE,
THUNDERSTRIKE_LED_UPDATE,
+ THUNDERSTRIKE_POWER_SUPPLY_STATS_UPDATE,
};
enum {
@@ -48,10 +55,46 @@ enum {
enum {
THUNDERSTRIKE_HOSTCMD_ID_FW_VERSION = 1,
THUNDERSTRIKE_HOSTCMD_ID_LED = 6,
+ THUNDERSTRIKE_HOSTCMD_ID_BATTERY,
THUNDERSTRIKE_HOSTCMD_ID_BOARD_INFO = 16,
THUNDERSTRIKE_HOSTCMD_ID_USB_INIT = 53,
THUNDERSTRIKE_HOSTCMD_ID_HAPTICS = 57,
- THUNDERSTRIKE_HOSTCMD_ID_BLUETOOTH_INIT = 58,
+ THUNDERSTRIKE_HOSTCMD_ID_CHARGER,
+};
+
+struct power_supply_dev {
+ struct power_supply *psy;
+ struct power_supply_desc desc;
+};
+
+struct thunderstrike_psy_prop_values {
+ int voltage_min;
+ int voltage_now;
+ int voltage_avg;
+ int voltage_boot;
+ int capacity;
+ int status;
+ int charge_type;
+ int temp;
+};
+
+static const enum power_supply_property thunderstrike_battery_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_CHARGE_TYPE,
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_VOLTAGE_MIN,
+ POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
+ POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_VOLTAGE_AVG,
+ POWER_SUPPLY_PROP_VOLTAGE_BOOT,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_SCOPE,
+ POWER_SUPPLY_PROP_TEMP,
+ POWER_SUPPLY_PROP_TEMP_MIN,
+ POWER_SUPPLY_PROP_TEMP_MAX,
+ POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
+ POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
};
enum thunderstrike_led_state {
@@ -60,6 +103,38 @@ enum thunderstrike_led_state {
} __packed;
static_assert(sizeof(enum thunderstrike_led_state) == 1);
+struct thunderstrike_hostcmd_battery {
+ __le16 voltage_avg;
+ u8 reserved_at_10;
+ __le16 thermistor;
+ __le16 voltage_min;
+ __le16 voltage_boot;
+ __le16 voltage_now;
+ u8 capacity;
+} __packed;
+
+enum thunderstrike_charger_type {
+ THUNDERSTRIKE_CHARGER_TYPE_NONE = 0,
+ THUNDERSTRIKE_CHARGER_TYPE_TRICKLE,
+ THUNDERSTRIKE_CHARGER_TYPE_NORMAL,
+} __packed;
+static_assert(sizeof(enum thunderstrike_charger_type) == 1);
+
+enum thunderstrike_charger_state {
+ THUNDERSTRIKE_CHARGER_STATE_UNKNOWN = 0,
+ THUNDERSTRIKE_CHARGER_STATE_DISABLED,
+ THUNDERSTRIKE_CHARGER_STATE_CHARGING,
+ THUNDERSTRIKE_CHARGER_STATE_FULL,
+ THUNDERSTRIKE_CHARGER_STATE_FAILED = 8,
+} __packed;
+static_assert(sizeof(enum thunderstrike_charger_state) == 1);
+
+struct thunderstrike_hostcmd_charger {
+ u8 connected;
+ enum thunderstrike_charger_type type;
+ enum thunderstrike_charger_state state;
+} __packed;
+
struct thunderstrike_hostcmd_board_info {
__le16 revision;
__le16 serial[7];
@@ -80,6 +155,8 @@ struct thunderstrike_hostcmd_resp_report {
struct thunderstrike_hostcmd_haptics motors;
__le16 fw_version;
enum thunderstrike_led_state led_state;
+ struct thunderstrike_hostcmd_battery battery;
+ struct thunderstrike_hostcmd_charger charger;
u8 payload[30];
} __packed;
} __packed;
@@ -109,6 +186,7 @@ static_assert(sizeof(struct thunderstrike_hostcmd_req_report) ==
/* Common struct for shield accessories. */
struct shield_device {
struct hid_device *hdev;
+ struct power_supply_dev battery_dev;
unsigned long initialized_flags;
const char *codename;
@@ -119,9 +197,17 @@ struct shield_device {
} board_info;
};
+/*
+ * Non-trivial to uniquely identify Thunderstrike controllers at initialization
+ * time. Use an ID allocator to help with this.
+ */
+static DEFINE_IDA(thunderstrike_ida);
+
struct thunderstrike {
struct shield_device base;
+ int id;
+
/* Sub-devices */
struct input_dev *haptics_dev;
struct led_classdev led_dev;
@@ -133,6 +219,9 @@ struct thunderstrike {
spinlock_t haptics_update_lock;
u8 led_state : 1;
enum thunderstrike_led_state led_value;
+ struct thunderstrike_psy_prop_values psy_stats;
+ spinlock_t psy_stats_lock;
+ struct timer_list psy_stats_timer;
struct work_struct hostcmd_req_work;
};
@@ -247,6 +336,16 @@ static void thunderstrike_hostcmd_req_work_handler(struct work_struct *work)
thunderstrike_send_hostcmd_request(ts);
}
+ if (test_and_clear_bit(THUNDERSTRIKE_POWER_SUPPLY_STATS_UPDATE, &ts->update_flags)) {
+ thunderstrike_hostcmd_req_report_init(
+ report, THUNDERSTRIKE_HOSTCMD_ID_BATTERY);
+ thunderstrike_send_hostcmd_request(ts);
+
+ thunderstrike_hostcmd_req_report_init(
+ report, THUNDERSTRIKE_HOSTCMD_ID_CHARGER);
+ thunderstrike_send_hostcmd_request(ts);
+ }
+
if (test_and_clear_bit(THUNDERSTRIKE_BOARD_INFO_UPDATE, &ts->update_flags)) {
thunderstrike_hostcmd_req_report_init(
report, THUNDERSTRIKE_HOSTCMD_ID_BOARD_INFO);
@@ -352,6 +451,93 @@ static void thunderstrike_led_set_brightness(struct led_classdev *led,
schedule_work(&ts->hostcmd_req_work);
}
+static int thunderstrike_battery_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct shield_device *shield_dev = power_supply_get_drvdata(psy);
+ struct thunderstrike_psy_prop_values prop_values;
+ struct thunderstrike *ts;
+ int ret = 0;
+
+ ts = container_of(shield_dev, struct thunderstrike, base);
+ spin_lock(&ts->psy_stats_lock);
+ prop_values = ts->psy_stats;
+ spin_unlock(&ts->psy_stats_lock);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ val->intval = prop_values.status;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_TYPE:
+ val->intval = prop_values.charge_type;
+ break;
+ case POWER_SUPPLY_PROP_PRESENT:
+ val->intval = 1;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MIN:
+ val->intval = prop_values.voltage_min;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+ val->intval = 2900000; /* 2.9 V */
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+ val->intval = 2200000; /* 2.2 V */
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ val->intval = prop_values.voltage_now;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_AVG:
+ val->intval = prop_values.voltage_avg;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_BOOT:
+ val->intval = prop_values.voltage_boot;
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY:
+ val->intval = prop_values.capacity;
+ break;
+ case POWER_SUPPLY_PROP_SCOPE:
+ val->intval = POWER_SUPPLY_SCOPE_DEVICE;
+ break;
+ case POWER_SUPPLY_PROP_TEMP:
+ val->intval = prop_values.temp;
+ break;
+ case POWER_SUPPLY_PROP_TEMP_MIN:
+ val->intval = 0; /* 0 C */
+ break;
+ case POWER_SUPPLY_PROP_TEMP_MAX:
+ val->intval = 400; /* 40 C */
+ break;
+ case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
+ val->intval = 15; /* 1.5 C */
+ break;
+ case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
+ val->intval = 380; /* 38 C */
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static inline void thunderstrike_request_psy_stats(struct thunderstrike *ts)
+{
+ set_bit(THUNDERSTRIKE_POWER_SUPPLY_STATS_UPDATE, &ts->update_flags);
+ schedule_work(&ts->hostcmd_req_work);
+}
+
+static void thunderstrike_psy_stats_timer_handler(struct timer_list *timer)
+{
+ struct thunderstrike *ts =
+ container_of(timer, struct thunderstrike, psy_stats_timer);
+
+ thunderstrike_request_psy_stats(ts);
+ /* Query battery statistics from device every five minutes */
+ mod_timer(timer, jiffies + 300 * HZ);
+}
+
static void
thunderstrike_parse_fw_version_payload(struct shield_device *shield_dev,
__le16 fw_version)
@@ -416,13 +602,138 @@ thunderstrike_parse_led_payload(struct shield_device *shield_dev,
hid_dbg(shield_dev->hdev, "Thunderstrike led HOSTCMD response, 0x%02X\n", led_state);
}
+static void thunderstrike_parse_battery_payload(
+ struct shield_device *shield_dev,
+ struct thunderstrike_hostcmd_battery *battery)
+{
+ struct thunderstrike *ts = container_of(shield_dev, struct thunderstrike, base);
+ u16 hostcmd_voltage_boot = le16_to_cpu(battery->voltage_boot);
+ u16 hostcmd_voltage_avg = le16_to_cpu(battery->voltage_avg);
+ u16 hostcmd_voltage_min = le16_to_cpu(battery->voltage_min);
+ u16 hostcmd_voltage_now = le16_to_cpu(battery->voltage_now);
+ u16 hostcmd_thermistor = le16_to_cpu(battery->thermistor);
+ int voltage_boot, voltage_avg, voltage_min, voltage_now;
+ struct hid_device *hdev = shield_dev->hdev;
+ u8 capacity = battery->capacity;
+ int temp;
+
+ /* Convert thunderstrike device values to µV and tenths of degree Celsius */
+ voltage_boot = hostcmd_voltage_boot * 1000;
+ voltage_avg = hostcmd_voltage_avg * 1000;
+ voltage_min = hostcmd_voltage_min * 1000;
+ voltage_now = hostcmd_voltage_now * 1000;
+ temp = (1378 - (int)hostcmd_thermistor) * 10 / 19;
+
+ /* Copy converted values */
+ spin_lock(&ts->psy_stats_lock);
+ ts->psy_stats.voltage_boot = voltage_boot;
+ ts->psy_stats.voltage_avg = voltage_avg;
+ ts->psy_stats.voltage_min = voltage_min;
+ ts->psy_stats.voltage_now = voltage_now;
+ ts->psy_stats.capacity = capacity;
+ ts->psy_stats.temp = temp;
+ spin_unlock(&ts->psy_stats_lock);
+
+ set_bit(SHIELD_BATTERY_STATS_INITIALIZED, &shield_dev->initialized_flags);
+
+ hid_dbg(hdev,
+ "Thunderstrike battery HOSTCMD response, voltage_avg: %u voltage_now: %u\n",
+ hostcmd_voltage_avg, hostcmd_voltage_now);
+ hid_dbg(hdev,
+ "Thunderstrike battery HOSTCMD response, voltage_boot: %u voltage_min: %u\n",
+ hostcmd_voltage_boot, hostcmd_voltage_min);
+ hid_dbg(hdev,
+ "Thunderstrike battery HOSTCMD response, thermistor: %u\n",
+ hostcmd_thermistor);
+ hid_dbg(hdev,
+ "Thunderstrike battery HOSTCMD response, capacity: %u%%\n",
+ capacity);
+}
+
+static void thunderstrike_parse_charger_payload(
+ struct shield_device *shield_dev,
+ struct thunderstrike_hostcmd_charger *charger)
+{
+ struct thunderstrike *ts = container_of(shield_dev, struct thunderstrike, base);
+ int charge_type = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
+ struct hid_device *hdev = shield_dev->hdev;
+ int status = POWER_SUPPLY_STATUS_UNKNOWN;
+
+ switch (charger->type) {
+ case THUNDERSTRIKE_CHARGER_TYPE_NONE:
+ charge_type = POWER_SUPPLY_CHARGE_TYPE_NONE;
+ break;
+ case THUNDERSTRIKE_CHARGER_TYPE_TRICKLE:
+ charge_type = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
+ break;
+ case THUNDERSTRIKE_CHARGER_TYPE_NORMAL:
+ charge_type = POWER_SUPPLY_CHARGE_TYPE_STANDARD;
+ break;
+ default:
+ hid_warn(hdev, "Unhandled Thunderstrike charger HOSTCMD type, %u\n",
+ charger->type);
+ break;
+ }
+
+ switch (charger->state) {
+ case THUNDERSTRIKE_CHARGER_STATE_UNKNOWN:
+ status = POWER_SUPPLY_STATUS_UNKNOWN;
+ break;
+ case THUNDERSTRIKE_CHARGER_STATE_DISABLED:
+ /* Indicates charger is disconnected */
+ break;
+ case THUNDERSTRIKE_CHARGER_STATE_CHARGING:
+ status = POWER_SUPPLY_STATUS_CHARGING;
+ break;
+ case THUNDERSTRIKE_CHARGER_STATE_FULL:
+ status = POWER_SUPPLY_STATUS_FULL;
+ break;
+ case THUNDERSTRIKE_CHARGER_STATE_FAILED:
+ status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ hid_err(hdev, "Thunderstrike device failed to charge\n");
+ break;
+ default:
+ hid_warn(hdev, "Unhandled Thunderstrike charger HOSTCMD state, %u\n",
+ charger->state);
+ break;
+ }
+
+ if (!charger->connected)
+ status = POWER_SUPPLY_STATUS_DISCHARGING;
+
+ spin_lock(&ts->psy_stats_lock);
+ ts->psy_stats.charge_type = charge_type;
+ ts->psy_stats.status = status;
+ spin_unlock(&ts->psy_stats_lock);
+
+ set_bit(SHIELD_CHARGER_STATE_INITIALIZED, &shield_dev->initialized_flags);
+
+ hid_dbg(hdev,
+ "Thunderstrike charger HOSTCMD response, connected: %u, type: %u, state: %u\n",
+ charger->connected, charger->type, charger->state);
+}
+
+static inline void thunderstrike_device_init_info(struct shield_device *shield_dev)
+{
+ struct thunderstrike *ts =
+ container_of(shield_dev, struct thunderstrike, base);
+
+ if (!test_bit(SHIELD_FW_VERSION_INITIALIZED, &shield_dev->initialized_flags))
+ thunderstrike_request_firmware_version(ts);
+
+ if (!test_bit(SHIELD_BOARD_INFO_INITIALIZED, &shield_dev->initialized_flags))
+ thunderstrike_request_board_info(ts);
+
+ if (!test_bit(SHIELD_BATTERY_STATS_INITIALIZED, &shield_dev->initialized_flags) ||
+ !test_bit(SHIELD_CHARGER_STATE_INITIALIZED, &shield_dev->initialized_flags))
+ thunderstrike_psy_stats_timer_handler(&ts->psy_stats_timer);
+}
+
static int thunderstrike_parse_report(struct shield_device *shield_dev,
struct hid_report *report, u8 *data,
int size)
{
struct thunderstrike_hostcmd_resp_report *hostcmd_resp_report;
- struct thunderstrike *ts =
- container_of(shield_dev, struct thunderstrike, base);
struct hid_device *hdev = shield_dev->hdev;
switch (report->id) {
@@ -445,6 +756,10 @@ static int thunderstrike_parse_report(struct shield_device *shield_dev,
case THUNDERSTRIKE_HOSTCMD_ID_LED:
thunderstrike_parse_led_payload(shield_dev, hostcmd_resp_report->led_state);
break;
+ case THUNDERSTRIKE_HOSTCMD_ID_BATTERY:
+ thunderstrike_parse_battery_payload(shield_dev,
+ &hostcmd_resp_report->battery);
+ break;
case THUNDERSTRIKE_HOSTCMD_ID_BOARD_INFO:
thunderstrike_parse_board_info_payload(
shield_dev, &hostcmd_resp_report->board_info);
@@ -453,14 +768,17 @@ static int thunderstrike_parse_report(struct shield_device *shield_dev,
thunderstrike_parse_haptics_payload(
shield_dev, &hostcmd_resp_report->motors);
break;
-
case THUNDERSTRIKE_HOSTCMD_ID_USB_INIT:
- case THUNDERSTRIKE_HOSTCMD_ID_BLUETOOTH_INIT:
/* May block HOSTCMD requests till received initially */
- thunderstrike_request_firmware_version(ts);
- thunderstrike_request_board_info(ts);
- /* Only HOSTCMD that can be triggered without a request */
- return 0;
+ thunderstrike_device_init_info(shield_dev);
+ break;
+ case THUNDERSTRIKE_HOSTCMD_ID_CHARGER:
+ /* May block HOSTCMD requests till received initially */
+ thunderstrike_device_init_info(shield_dev);
+
+ thunderstrike_parse_charger_payload(
+ shield_dev, &hostcmd_resp_report->charger);
+ break;
default:
hid_warn(hdev,
"Unhandled Thunderstrike HOSTCMD id %d\n",
@@ -489,6 +807,50 @@ static inline int thunderstrike_led_create(struct thunderstrike *ts)
return led_classdev_register(&ts->base.hdev->dev, led);
}
+static inline int thunderstrike_psy_create(struct shield_device *shield_dev)
+{
+ struct thunderstrike *ts = container_of(shield_dev, struct thunderstrike, base);
+ struct power_supply_config psy_cfg = { .drv_data = shield_dev, };
+ struct hid_device *hdev = shield_dev->hdev;
+ int ret;
+
+ /*
+ * Set an initial capacity and temperature value to avoid prematurely
+ * triggering alerts. Will be replaced by values queried from initial
+ * HOSTCMD requests.
+ */
+ ts->psy_stats.capacity = 100;
+ ts->psy_stats.temp = 182;
+
+ shield_dev->battery_dev.desc.properties = thunderstrike_battery_props;
+ shield_dev->battery_dev.desc.num_properties =
+ ARRAY_SIZE(thunderstrike_battery_props);
+ shield_dev->battery_dev.desc.get_property = thunderstrike_battery_get_property;
+ shield_dev->battery_dev.desc.type = POWER_SUPPLY_TYPE_BATTERY;
+ shield_dev->battery_dev.desc.name =
+ devm_kasprintf(&ts->base.hdev->dev, GFP_KERNEL,
+ "thunderstrike_%d", ts->id);
+
+ shield_dev->battery_dev.psy = power_supply_register(
+ &hdev->dev, &shield_dev->battery_dev.desc, &psy_cfg);
+ if (IS_ERR(shield_dev->battery_dev.psy)) {
+ hid_err(hdev, "Failed to register Thunderstrike battery device\n");
+ return PTR_ERR(shield_dev->battery_dev.psy);
+ }
+
+ ret = power_supply_powers(shield_dev->battery_dev.psy, &hdev->dev);
+ if (ret) {
+ hid_err(hdev, "Failed to associate battery device to Thunderstrike\n");
+ goto err;
+ }
+
+ return 0;
+
+err:
+ power_supply_unregister(shield_dev->battery_dev.psy);
+ return ret;
+}
+
static struct shield_device *thunderstrike_create(struct hid_device *hdev)
{
struct shield_device *shield_dev;
@@ -509,27 +871,47 @@ static struct shield_device *thunderstrike_create(struct hid_device *hdev)
shield_dev->codename = "Thunderstrike";
spin_lock_init(&ts->haptics_update_lock);
+ spin_lock_init(&ts->psy_stats_lock);
INIT_WORK(&ts->hostcmd_req_work, thunderstrike_hostcmd_req_work_handler);
hid_set_drvdata(hdev, shield_dev);
+ ts->id = ida_alloc(&thunderstrike_ida, GFP_KERNEL);
+ if (ts->id < 0)
+ return ERR_PTR(ts->id);
+
ts->haptics_dev = shield_haptics_create(shield_dev, thunderstrike_play_effect);
- if (IS_ERR(ts->haptics_dev))
- return ERR_CAST(ts->haptics_dev);
+ if (IS_ERR(ts->haptics_dev)) {
+ hid_err(hdev, "Failed to create Thunderstrike haptics instance\n");
+ ret = PTR_ERR(ts->haptics_dev);
+ goto err_id;
+ }
+
+ ret = thunderstrike_psy_create(shield_dev);
+ if (ret) {
+ hid_err(hdev, "Failed to create Thunderstrike power supply instance\n");
+ goto err_haptics;
+ }
ret = thunderstrike_led_create(ts);
if (ret) {
hid_err(hdev, "Failed to create Thunderstrike LED instance\n");
- goto err;
+ goto err_psy;
}
+ timer_setup(&ts->psy_stats_timer, thunderstrike_psy_stats_timer_handler, 0);
+
hid_info(hdev, "Registered Thunderstrike controller\n");
return shield_dev;
-err:
+err_psy:
+ power_supply_unregister(shield_dev->battery_dev.psy);
+err_haptics:
if (ts->haptics_dev)
input_unregister_device(ts->haptics_dev);
- return ERR_CAST(ts->haptics_dev);
+err_id:
+ ida_free(&thunderstrike_ida, ts->id);
+ return ERR_PTR(ret);
}
static int android_input_mapping(struct hid_device *hdev, struct hid_input *hi,
@@ -684,8 +1066,7 @@ static int shield_probe(struct hid_device *hdev, const struct hid_device_id *id)
goto err_stop;
}
- thunderstrike_request_firmware_version(ts);
- thunderstrike_request_board_info(ts);
+ thunderstrike_device_init_info(shield_dev);
return ret;
@@ -705,9 +1086,12 @@ static void shield_remove(struct hid_device *hdev)
ts = container_of(dev, struct thunderstrike, base);
hid_hw_close(hdev);
- led_classdev_unregister(&ts->led_dev);
+ power_supply_unregister(dev->battery_dev.psy);
if (ts->haptics_dev)
input_unregister_device(ts->haptics_dev);
+ led_classdev_unregister(&ts->led_dev);
+ ida_free(&thunderstrike_ida, ts->id);
+ del_timer_sync(&ts->psy_stats_timer);
cancel_work_sync(&ts->hostcmd_req_work);
hid_hw_stop(hdev);
}
Use power supply API to expose battery information about connected Thunderstrike controllers to the system. Provide information on battery capacity, charge status, charger type, voltage, and temperature. Signed-off-by: Rahul Rameshbabu <rrameshbabu@nvidia.com> --- drivers/hid/hid-nvidia-shield.c | 418 ++++++++++++++++++++++++++++++-- 1 file changed, 401 insertions(+), 17 deletions(-)