3 files changed, 87 insertions, 29 deletions

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index b88ae113d367..af08ce7207d9 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1159,7 +1159,7 @@ static bool hid_match_one_id(struct hid_device *hdev,
                 (id->product == HID_ANY_ID || id->product == hdev->product);
 }
 
-static const struct hid_device_id *hid_match_id(struct hid_device *hdev,
+const struct hid_device_id *hid_match_id(struct hid_device *hdev,
                 const struct hid_device_id *id)
 {
         for (; id->bus; id++)
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 448e9d89f8d0..b8574cddd953 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -125,6 +125,7 @@
 #define USB_DEVICE_ID_APPLE_ALU_WIRELESS_2009_ANSI  0x0239
 #define USB_DEVICE_ID_APPLE_ALU_WIRELESS_2009_ISO   0x023a
 #define USB_DEVICE_ID_APPLE_ALU_WIRELESS_2009_JIS   0x023b
+#define USB_DEVICE_ID_APPLE_ALU_WIRELESS_2011_ANSI  0x0255
 #define USB_DEVICE_ID_APPLE_ALU_WIRELESS_2011_ISO   0x0256
 #define USB_DEVICE_ID_APPLE_FOUNTAIN_TP_ONLY    0x030a
 #define USB_DEVICE_ID_APPLE_GEYSER1_TP_ONLY     0x030b
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index c6ee632bfd68..9333d692a786 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -32,6 +32,8 @@
 #include <linux/hid.h>
 #include <linux/hid-debug.h>
 
+#include "hid-ids.h"
+
 #define unk     KEY_UNKNOWN
 
 static const unsigned char hid_keyboard[256] = {
@@ -277,14 +279,38 @@ static enum power_supply_property hidinput_battery_props[] = {
         POWER_SUPPLY_PROP_ONLINE,
         POWER_SUPPLY_PROP_CAPACITY,
         POWER_SUPPLY_PROP_MODEL_NAME,
+        POWER_SUPPLY_PROP_STATUS
 };
 
+#define HID_BATTERY_QUIRK_PERCENT       (1 << 0) /* always reports percent */
+#define HID_BATTERY_QUIRK_FEATURE       (1 << 1) /* ask for feature report */
+
+static const struct hid_device_id hid_battery_quirks[] = {
+        { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
+                               USB_DEVICE_ID_APPLE_ALU_WIRELESS_2011_ANSI),
+          HID_BATTERY_QUIRK_PERCENT | HID_BATTERY_QUIRK_FEATURE },
+        {}
+};
+
+static unsigned find_battery_quirk(struct hid_device *hdev)
+{
+        unsigned quirks = 0;
+        const struct hid_device_id *match;
+
+        match = hid_match_id(hdev, hid_battery_quirks);
+        if (match != NULL)
+                quirks = match->driver_data;
+
+        return quirks;
+}
+
 static int hidinput_get_battery_property(struct power_supply *psy,
                                          enum power_supply_property prop,
                                          union power_supply_propval *val)
 {
         struct hid_device *dev = container_of(psy, struct hid_device, battery);
         int ret = 0;
+        __u8 buf[2] = {};
 
         switch (prop) {
         case POWER_SUPPLY_PROP_PRESENT:
@@ -293,19 +319,31 @@ static int hidinput_get_battery_property(struct power_supply *psy,
                 break;
 
         case POWER_SUPPLY_PROP_CAPACITY:
+                ret = dev->hid_get_raw_report(dev, dev->battery_report_id,
+                                              buf, sizeof(buf),
+                                              dev->battery_report_type);
+
+                if (ret != 2) {
+                        if (ret >= 0)
+                                ret = -EINVAL;
+                        break;
+                }
+
                 if (dev->battery_min < dev->battery_max &&
-                    dev->battery_val >= dev->battery_min &&
-                    dev->battery_val <= dev->battery_max)
-                        val->intval = (100 * (dev->battery_val - dev->battery_min)) /
+                    buf[1] >= dev->battery_min &&
+                    buf[1] <= dev->battery_max)
+                        val->intval = (100 * (buf[1] - dev->battery_min)) /
                                 (dev->battery_max - dev->battery_min);
-                else
-                        ret = -EINVAL;
                 break;
 
         case POWER_SUPPLY_PROP_MODEL_NAME:
                 val->strval = dev->name;
                 break;
 
+        case POWER_SUPPLY_PROP_STATUS:
+                val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+                break;
+
         default:
                 ret = -EINVAL;
                 break;
@@ -314,17 +352,22 @@ static int hidinput_get_battery_property(struct power_supply *psy,
         return ret;
 }
 
-static void hidinput_setup_battery(struct hid_device *dev, s32 min, s32 max)
+static bool hidinput_setup_battery(struct hid_device *dev, unsigned report_type, struct hid_field *field)
 {
         struct power_supply *battery = &dev->battery;
         int ret;
+        unsigned quirks;
+        s32 min, max;
+
+        if (field->usage->hid != HID_DC_BATTERYSTRENGTH)
+                return false;   /* no match */
 
         if (battery->name != NULL)
-                return;         /* already initialized? */
+                goto out;       /* already initialized? */
 
         battery->name = kasprintf(GFP_KERNEL, "hid-%s-battery", dev->uniq);
         if (battery->name == NULL)
-                return;
+                goto out;
 
         battery->type = POWER_SUPPLY_TYPE_BATTERY;
         battery->properties = hidinput_battery_props;
@@ -332,8 +375,26 @@ static void hidinput_setup_battery(struct hid_device *dev, s32 min, s32 max)
         battery->use_for_apm = 0;
         battery->get_property = hidinput_get_battery_property;
 
+        quirks = find_battery_quirk(dev);
+
+        hid_dbg(dev, "device %x:%x:%x %d quirks %d\n",
+                dev->bus, dev->vendor, dev->product, dev->version, quirks);
+
+        min = field->logical_minimum;
+        max = field->logical_maximum;
+
+        if (quirks & HID_BATTERY_QUIRK_PERCENT) {
+                min = 0;
+                max = 100;
+        }
+
+        if (quirks & HID_BATTERY_QUIRK_FEATURE)
+                report_type = HID_FEATURE_REPORT;
+
         dev->battery_min = min;
         dev->battery_max = max;
+        dev->battery_report_type = report_type;
+        dev->battery_report_id = field->report->id;
 
         ret = power_supply_register(&dev->dev, battery);
         if (ret != 0) {
@@ -341,6 +402,9 @@ static void hidinput_setup_battery(struct hid_device *dev, s32 min, s32 max)
                 kfree(battery->name);
                 battery->name = NULL;
         }
+
+out:
+        return true;
 }
 
 static void hidinput_cleanup_battery(struct hid_device *dev)
@@ -353,8 +417,10 @@ static void hidinput_cleanup_battery(struct hid_device *dev)
         dev->battery.name = NULL;
 }
 #else  /* !CONFIG_HID_BATTERY_STRENGTH */
-static void hidinput_setup_battery(struct hid_device *dev, s32 min, s32 max)
+static bool hidinput_setup_battery(struct hid_device *dev, unsigned report_type,
+                                   struct hid_field *field)
 {
+        return false;
 }
 
 static void hidinput_cleanup_battery(struct hid_device *dev)
@@ -721,12 +787,9 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
                 break;
 
         case HID_UP_GENDEVCTRLS:
-                if ((usage->hid & HID_USAGE) == 0x20) { /* Battery Strength */
-                        hidinput_setup_battery(device,
-                                               field->logical_minimum,
-                                               field->logical_maximum);
+                if (hidinput_setup_battery(device, HID_INPUT_REPORT, field))
                         goto ignore;
-                } else
+                else
                         goto unknown;
                 break;
 
@@ -861,14 +924,6 @@ void hidinput_hid_event(struct hid_device *hid, struct hid_field *field, struct
 
         input = field->hidinput->input;
 
-#ifdef CONFIG_HID_BATTERY_STRENGTH
-        if (usage->hid == HID_DC_BATTERYSTRENGTH) {
-                hid->battery_val = value;
-                hid_dbg(hid, "battery value is %d (range %d-%d)\n",
-                        value, hid->battery_min, hid->battery_max);
-                return;
-        }
-#endif
         if (!usage->type)
                 return;
 
@@ -1039,15 +1094,17 @@ static void report_features(struct hid_device *hid)
         struct hid_report *rep;
         int i, j;
 
-        if (!drv->feature_mapping)
-                return;
-
         rep_enum = &hid->report_enum[HID_FEATURE_REPORT];
         list_for_each_entry(rep, &rep_enum->report_list, list)
                 for (i = 0; i < rep->maxfield; i++)
-                        for (j = 0; j < rep->field[i]->maxusage; j++)
-                                drv->feature_mapping(hid, rep->field[i],
-                                                     rep->field[i]->usage + j);
+                        for (j = 0; j < rep->field[i]->maxusage; j++) {
+                                /* Verify if Battery Strength feature is available */
+                                hidinput_setup_battery(hid, HID_FEATURE_REPORT, rep->field[i]);
+
+                                if (drv->feature_mapping)
+                                        drv->feature_mapping(hid, rep->field[i],
+                                                             rep->field[i]->usage + j);
+                        }
 }
 
 /*