HID: sony: add battery status reporting for the Sixaxis and Dualshock 4

Add battery status reporting for the Sixaxis and Dualshock 4 controllers.

Signed-off-by: Frank Praznik <frank.praznik@oh.rr.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 185 insertions, 1 deletions

diff --git a/drivers/hid/hid-sony.c b/drivers/hid/hid-sony.c
index 12354055d474..04fd611d3099 100644
--- a/drivers/hid/hid-sony.c
+++ b/drivers/hid/hid-sony.c
@@ -30,6 +30,8 @@
 #include <linux/slab.h>
 #include <linux/usb.h>
 #include <linux/leds.h>
+#include <linux/power_supply.h>
+#include <linux/spinlock.h>
 
 #include "hid-ids.h"
 
@@ -42,6 +44,7 @@
 #define DUALSHOCK4_CONTROLLER_BT  BIT(6)
 
 #define SONY_LED_SUPPORT (SIXAXIS_CONTROLLER_USB | BUZZ_CONTROLLER | DUALSHOCK4_CONTROLLER_USB)
+#define SONY_BATTERY_SUPPORT (SIXAXIS_CONTROLLER_USB | SIXAXIS_CONTROLLER_BT | DUALSHOCK4_CONTROLLER_USB)
 
 #define MAX_LEDS 4
 
@@ -487,18 +490,30 @@ static const unsigned int buzz_keymap[] = {
         [20] = BTN_TRIGGER_HAPPY20,
 };
 
+static enum power_supply_property sony_battery_props[] = {
+        POWER_SUPPLY_PROP_PRESENT,
+        POWER_SUPPLY_PROP_CAPACITY,
+        POWER_SUPPLY_PROP_SCOPE,
+        POWER_SUPPLY_PROP_STATUS,
+};
+
 struct sony_sc {
+        spinlock_t lock;
         struct hid_device *hdev;
         struct led_classdev *leds[MAX_LEDS];
         struct hid_report *output_report;
         unsigned long quirks;
         struct work_struct state_worker;
+        struct power_supply battery;
 
 #ifdef CONFIG_SONY_FF
         __u8 left;
         __u8 right;
 #endif
 
+        __u8 cable_state;
+        __u8 battery_charging;
+        __u8 battery_capacity;
         __u8 led_state[MAX_LEDS];
         __u8 led_count;
 };
@@ -599,6 +614,63 @@ static __u8 *sony_report_fixup(struct hid_device *hdev, __u8 *rdesc,
         return rdesc;
 }
 
+static void sixaxis_parse_report(struct sony_sc *sc, __u8 *rd, int size)
+{
+        static const __u8 sixaxis_battery_capacity[] = { 0, 1, 25, 50, 75, 100 };
+        unsigned long flags;
+        __u8 cable_state, battery_capacity, battery_charging;
+
+        /* The sixaxis is charging if the battery value is 0xee
+         * and it is fully charged if the value is 0xef.
+         * It does not report the actual level while charging so it
+         * is set to 100% while charging is in progress.
+         */
+        if (rd[30] >= 0xee) {
+                battery_capacity = 100;
+                battery_charging = rd[30] & 0x01;
+        } else {
+                battery_capacity = sixaxis_battery_capacity[rd[30]];
+                battery_charging = 0;
+        }
+        cable_state = (rd[31] >> 4) & 0x01;
+
+        spin_lock_irqsave(&sc->lock, flags);
+        sc->cable_state = cable_state;
+        sc->battery_capacity = battery_capacity;
+        sc->battery_charging = battery_charging;
+        spin_unlock_irqrestore(&sc->lock, flags);
+}
+
+static void dualshock4_parse_report(struct sony_sc *sc, __u8 *rd, int size)
+{
+        unsigned long flags;
+        __u8 cable_state, battery_capacity, battery_charging;
+
+        /* The lower 4 bits of byte 30 contain the battery level
+         * and the 5th bit contains the USB cable state.
+         */
+        cable_state = (rd[30] >> 4) & 0x01;
+        battery_capacity = rd[30] & 0x0F;
+
+        /* On USB the Dualshock 4 battery level goes from 0 to 11.
+         * A battery level of 11 means fully charged.
+         */
+        if (cable_state && battery_capacity == 11)
+                battery_charging = 0;
+        else
+                battery_charging = 1;
+
+        if (battery_capacity > 10)
+                battery_capacity--;
+        battery_capacity *= 10;
+
+        spin_lock_irqsave(&sc->lock, flags);
+        sc->cable_state = cable_state;
+        sc->battery_capacity = battery_capacity;
+        sc->battery_charging = battery_charging;
+        spin_unlock_irqrestore(&sc->lock, flags);
+}
+
 static int sony_raw_event(struct hid_device *hdev, struct hid_report *report,
                 __u8 *rd, int size)
 {
@@ -613,6 +685,11 @@ static int sony_raw_event(struct hid_device *hdev, struct hid_report *report,
                 swap(rd[43], rd[44]);
                 swap(rd[45], rd[46]);
                 swap(rd[47], rd[48]);
+
+                sixaxis_parse_report(sc, rd, size);
+        } else if ((sc->quirks & DUALSHOCK4_CONTROLLER_USB) && rd[0] == 0x01 &&
+                        size == 64) {
+                dualshock4_parse_report(sc, rd, size);
         }
 
         return 0;
@@ -1011,6 +1088,91 @@ static void sony_destroy_ff(struct hid_device *hdev)
 }
 #endif
 
+static int sony_battery_get_property(struct power_supply *psy,
+                                     enum power_supply_property psp,
+                                     union power_supply_propval *val)
+{
+        struct sony_sc *sc = container_of(psy, struct sony_sc, battery);
+        unsigned long flags;
+        int ret = 0;
+        u8 battery_charging, battery_capacity, cable_state;
+
+        spin_lock_irqsave(&sc->lock, flags);
+        battery_charging = sc->battery_charging;
+        battery_capacity = sc->battery_capacity;
+        cable_state = sc->cable_state;
+        spin_unlock_irqrestore(&sc->lock, flags);
+
+        switch (psp) {
+        case POWER_SUPPLY_PROP_PRESENT:
+                val->intval = 1;
+                break;
+        case POWER_SUPPLY_PROP_SCOPE:
+                val->intval = POWER_SUPPLY_SCOPE_DEVICE;
+                break;
+        case POWER_SUPPLY_PROP_CAPACITY:
+                val->intval = battery_capacity;
+                break;
+        case POWER_SUPPLY_PROP_STATUS:
+                if (battery_charging)
+                        val->intval = POWER_SUPPLY_STATUS_CHARGING;
+                else
+                        if (battery_capacity == 100 && cable_state)
+                                val->intval = POWER_SUPPLY_STATUS_FULL;
+                        else
+                                val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+                break;
+        default:
+                ret = -EINVAL;
+                break;
+        }
+        return ret;
+}
+
+static int sony_battery_probe(struct sony_sc *sc)
+{
+        static atomic_t power_id_seq = ATOMIC_INIT(0);
+        unsigned long power_id;
+        struct hid_device *hdev = sc->hdev;
+        int ret;
+
+        power_id = (unsigned long)atomic_inc_return(&power_id_seq);
+
+        sc->battery.properties = sony_battery_props;
+        sc->battery.num_properties = ARRAY_SIZE(sony_battery_props);
+        sc->battery.get_pro