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authorPrzemo Firszt <przemo@firszt.eu>2010-03-15 19:16:23 +0000
committerJiri Kosina <jkosina@suse.cz>2010-03-16 11:55:43 +0100
commit59d2334ac9f4255f5f8f3e4e1bf41653e0bba99e (patch)
treeea12f472f551f7d0875a0dd61ae336fd91157497 /drivers/hid/hid-wacom.c
parent4da361b69102cdffe73006771eae7504d2cb8736 (diff)
HID: expose wacom pen tablet battery through power_supply class
This patch exposes wacom pen tablet battery capacity and ac state thru power_supply class is sysfs. Signed-off-by: Przemo Firszt <przemo@firszt.eu> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-wacom.c')
-rw-r--r--drivers/hid/hid-wacom.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/drivers/hid/hid-wacom.c b/drivers/hid/hid-wacom.c
index 8d3b46f5d14..4d2d2a2e1a5 100644
--- a/drivers/hid/hid-wacom.c
+++ b/drivers/hid/hid-wacom.c
@@ -21,14 +21,88 @@
#include <linux/device.h>
#include <linux/hid.h>
#include <linux/module.h>
+#ifdef CONFIG_HID_WACOM_POWER_SUPPLY
+#include <linux/power_supply.h>
+#endif
#include "hid-ids.h"
struct wacom_data {
__u16 tool;
unsigned char butstate;
+#ifdef CONFIG_HID_WACOM_POWER_SUPPLY
+ int battery_capacity;
+ struct power_supply battery;
+ struct power_supply ac;
+#endif
};
+#ifdef CONFIG_HID_WACOM_POWER_SUPPLY
+/*percent of battery capacity, 0 means AC online*/
+static unsigned short batcap[8] = { 1, 15, 25, 35, 50, 70, 100, 0 };
+
+static enum power_supply_property wacom_battery_props[] = {
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_CAPACITY
+};
+
+static enum power_supply_property wacom_ac_props[] = {
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_ONLINE
+};
+
+static int wacom_battery_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct wacom_data *wdata = container_of(psy,
+ struct wacom_data, battery);
+ int power_state = batcap[wdata->battery_capacity];
+ int ret = 0;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_PRESENT:
+ val->intval = 1;
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY:
+ /* show 100% battery capacity when charging */
+ if (power_state == 0)
+ val->intval = 100;
+ else
+ val->intval = power_state;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ return ret;
+}
+
+static int wacom_ac_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct wacom_data *wdata = container_of(psy, struct wacom_data, ac);
+ int power_state = batcap[wdata->battery_capacity];
+ int ret = 0;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_PRESENT:
+ /* fall through */
+ case POWER_SUPPLY_PROP_ONLINE:
+ if (power_state == 0)
+ val->intval = 1;
+ else
+ val->intval = 0;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ return ret;
+}
+#endif
+
static int wacom_raw_event(struct hid_device *hdev, struct hid_report *report,
u8 *raw_data, int size)
{
@@ -147,6 +221,12 @@ static int wacom_raw_event(struct hid_device *hdev, struct hid_report *report,
input_sync(input);
}
+#ifdef CONFIG_HID_WACOM_POWER_SUPPLY
+ /* Store current battery capacity */
+ rw = (data[7] >> 2 & 0x07);
+ if (rw != wdata->battery_capacity)
+ wdata->battery_capacity = rw;
+#endif
return 1;
}
@@ -206,6 +286,45 @@ static int wacom_probe(struct hid_device *hdev,
if (ret < 0)
dev_warn(&hdev->dev, "failed to poke device #2, %d\n", ret);
+#ifdef CONFIG_HID_WACOM_POWER_SUPPLY
+ wdata->battery.properties = wacom_battery_props;
+ wdata->battery.num_properties = ARRAY_SIZE(wacom_battery_props);
+ wdata->battery.get_property = wacom_battery_get_property;
+ wdata->battery.name = "wacom_battery";
+ wdata->battery.type = POWER_SUPPLY_TYPE_BATTERY;
+ wdata->battery.use_for_apm = 0;
+
+ ret = power_supply_register(&hdev->dev, &wdata->battery);
+ if (ret) {
+ dev_warn(&hdev->dev,
+ "can't create sysfs battery attribute, err: %d\n", ret);
+ /*
+ * battery attribute is not critical for the tablet, but if it
+ * failed then there is no need to create ac attribute
+ */
+ goto move_on;
+ }
+
+ wdata->ac.properties = wacom_ac_props;
+ wdata->ac.num_properties = ARRAY_SIZE(wacom_ac_props);
+ wdata->ac.get_property = wacom_ac_get_property;
+ wdata->ac.name = "wacom_ac";
+ wdata->ac.type = POWER_SUPPLY_TYPE_MAINS;
+ wdata->ac.use_for_apm = 0;
+
+ ret = power_supply_register(&hdev->dev, &wdata->ac);
+ if (ret) {
+ dev_warn(&hdev->dev,
+ "can't create ac battery attribute, err: %d\n", ret);
+ /*
+ * ac attribute is not critical for the tablet, but if it
+ * failed then we don't want to battery attribute to exist
+ */
+ power_supply_unregister(&wdata->battery);
+ }
+
+move_on:
+#endif
hidinput = list_entry(hdev->inputs.next, struct hid_input, list);
input = hidinput->input;
@@ -250,7 +369,15 @@ err_free:
static void wacom_remove(struct hid_device *hdev)
{
+#ifdef CONFIG_HID_WACOM_POWER_SUPPLY
+ struct wacom_data *wdata = hid_get_drvdata(hdev);
+#endif
hid_hw_stop(hdev);
+
+#ifdef CONFIG_HID_WACOM_POWER_SUPPLY
+ power_supply_unregister(&wdata->battery);
+ power_supply_unregister(&wdata->ac);
+#endif
kfree(hid_get_drvdata(hdev));
}