Input: wacom - wireless battery status

Signed-off-by: Chris Bagwell <chris@cnpbagwell.com>
Tested-by: Jason Gerecke <killertofu@gmail.com>
Acked-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

diff --git a/drivers/input/tablet/Kconfig b/drivers/input/tablet/Kconfig
index 58a8775..0edeb94 100644 (file)
--- a/drivers/input/tablet/Kconfig
+++ b/drivers/input/tablet/Kconfig
@@ -76,6 +76,7 @@ config TABLET_USB_KBTAB
 config TABLET_USB_WACOM
        tristate "Wacom Intuos/Graphire tablet support (USB)"
        depends on USB_ARCH_HAS_HCD
+       select POWER_SUPPLY
        select USB
        help
          Say Y here if you want to use the USB version of the Wacom Intuos

diff --git a/drivers/input/tablet/wacom.h b/drivers/input/tablet/wacom.h
index febbfd9..b4842d0 100644 (file)
--- a/drivers/input/tablet/wacom.h
+++ b/drivers/input/tablet/wacom.h
@@ -88,6 +88,7 @@
 #include <linux/mod_devicetable.h>
 #include <linux/init.h>
 #include <linux/usb/input.h>
+#include <linux/power_supply.h>
 #include <asm/unaligned.h>
 
 /*
@@ -121,6 +122,7 @@ struct wacom {
                u8 hlv;       /* status led brightness button pressed (1..127) */
                u8 img_lum;   /* OLED matrix display brightness */
        } led;
+       struct power_supply battery;
 };
 
 static inline void wacom_schedule_work(struct wacom_wac *wacom_wac)

diff --git a/drivers/input/tablet/wacom_sys.c b/drivers/input/tablet/wacom_sys.c
index 2fc7705..19ba586 100644 (file)
--- a/drivers/input/tablet/wacom_sys.c
+++ b/drivers/input/tablet/wacom_sys.c
@@ -843,6 +843,55 @@ static void wacom_destroy_leds(struct wacom *wacom)
        }
 }
 
+static enum power_supply_property wacom_battery_props[] = {
+       POWER_SUPPLY_PROP_CAPACITY
+};
+
+static int wacom_battery_get_property(struct power_supply *psy,
+                                     enum power_supply_property psp,
+                                     union power_supply_propval *val)
+{
+       struct wacom *wacom = container_of(psy, struct wacom, battery);
+       int ret = 0;
+
+       switch (psp) {
+               case POWER_SUPPLY_PROP_CAPACITY:
+                       val->intval =
+                               wacom->wacom_wac.battery_capacity * 100 / 31;
+                       break;
+               default:
+                       ret = -EINVAL;
+                       break;
+       }
+
+       return ret;
+}
+
+static int wacom_initialize_battery(struct wacom *wacom)
+{
+       int error = 0;
+
+       if (wacom->wacom_wac.features.quirks & WACOM_QUIRK_MONITOR) {
+               wacom->battery.properties = wacom_battery_props;
+               wacom->battery.num_properties = ARRAY_SIZE(wacom_battery_props);
+               wacom->battery.get_property = wacom_battery_get_property;
+               wacom->battery.name = "wacom_battery";
+               wacom->battery.type = POWER_SUPPLY_TYPE_BATTERY;
+               wacom->battery.use_for_apm = 0;
+
+               error = power_supply_register(&wacom->usbdev->dev,
+                                             &wacom->battery);
+       }
+
+       return error;
+}
+
+static void wacom_destroy_battery(struct wacom *wacom)
+{
+       if (wacom->wacom_wac.features.quirks & WACOM_QUIRK_MONITOR)
+               power_supply_unregister(&wacom->battery);
+}
+
 static int wacom_register_input(struct wacom *wacom)
 {
        struct input_dev *input_dev;
@@ -1016,10 +1065,14 @@ static int wacom_probe(struct usb_interface *intf, const struct usb_device_id *i
        if (error)
                goto fail4;
 
+       error = wacom_initialize_battery(wacom);
+       if (error)
+               goto fail5;
+
        if (!(features->quirks & WACOM_QUIRK_NO_INPUT)) {
                error = wacom_register_input(wacom);
                if (error)
-                       goto fail5;
+                       goto fail6;
        }
 
        /* Note that if query fails it is not a hard failure */
@@ -1034,6 +1087,7 @@ static int wacom_probe(struct usb_interface *intf, const struct usb_device_id *i
 
        return 0;
 
+ fail6: wacom_destroy_battery(wacom);
  fail5: wacom_destroy_leds(wacom);
  fail4:        wacom_remove_shared_data(wacom_wac);
  fail3:        usb_free_urb(wacom->irq);
@@ -1052,6 +1106,7 @@ static void wacom_disconnect(struct usb_interface *intf)
        cancel_work_sync(&wacom->work);
        if (wacom->wacom_wac.input)
                input_unregister_device(wacom->wacom_wac.input);
+       wacom_destroy_battery(wacom);
        wacom_destroy_leds(wacom);
        usb_free_urb(wacom->irq);
        usb_free_coherent(interface_to_usbdev(intf), WACOM_PKGLEN_MAX,

diff --git a/drivers/input/tablet/wacom_wac.c b/drivers/input/tablet/wacom_wac.c
index fce7a09..99fb6fe 100644 (file)
--- a/drivers/input/tablet/wacom_wac.c
+++ b/drivers/input/tablet/wacom_wac.c
@@ -1054,17 +1054,20 @@ static int wacom_wireless_irq(struct wacom_wac *wacom, size_t len)
 
        connected = data[1] & 0x01;
        if (connected) {
-               int pid;
+               int pid, battery;
 
                pid = get_unaligned_be16(&data[6]);
+               battery = data[5] & 0x3f;
                if (wacom->pid != pid) {
                        wacom->pid = pid;
                        wacom_schedule_work(wacom);
                }
+               wacom->battery_capacity = battery;
        } else if (wacom->pid != 0) {
                /* disconnected while previously connected */
                wacom->pid = 0;
                wacom_schedule_work(wacom);
+               wacom->battery_capacity = 0;
        }
 
        return 0;

diff --git a/drivers/input/tablet/wacom_wac.h b/drivers/input/tablet/wacom_wac.h
index cffaf6b..ba5a334 100644 (file)
--- a/drivers/input/tablet/wacom_wac.h
+++ b/drivers/input/tablet/wacom_wac.h
@@ -112,6 +112,7 @@ struct wacom_wac {
        struct wacom_shared *shared;
        struct input_dev *input;
        int pid;
+       int battery_capacity;
 };
 
 #endif