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Commit 59d2334a authored by Przemo Firszt's avatar Przemo Firszt Committed by Jiri Kosina
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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: default avatarPrzemo Firszt <przemo@firszt.eu>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 4da361b6

drivers/hid/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -357,6 +357,14 @@ config HID_WACOM 
	---help---

	Support for Wacom Graphire Bluetooth tablet.



config HID_WACOM_POWER_SUPPLY

	bool "Wacom Bluetooth devices power supply status support"

	depends on HID_WACOM

	select POWER_SUPPLY

	---help---

	  Say Y here if you want to enable power supply status monitoring for

	  Wacom Bluetooth devices.



config HID_ZEROPLUS

	tristate "Zeroplus based game controller support" if EMBEDDED

	depends on USB_HID

drivers/hid/hid-wacom.c

+127 −0
Original line number Diff line number Diff line
@@ -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));

}