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HID: add sysfs speed attribute for wacom bluetooth tablet

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The attribute allows to change reporting speed of tablet from userspace through
sysfs file. The attribute is RW, valid values: 0 is low speed, 1 is high speed.
High speed is the default setting. Using low speed is a workaround if you
experience lag when using the tablet.

Signed-off-by: Przemo Firszt <przemo@firszt.eu>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Przemo Firszt 2010-03-18 14:34:34 +00:00 committed by Jiri Kosina
parent 06c7c313b5
commit 20a3ce7e49
1 changed files with 39 additions and 1 deletions
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40
drivers/hid/hid-wacom.c
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@ -30,6 +30,7 @@
struct wacom_data {
__u16 tool;
unsigned char butstate;
unsigned char high_speed;
#ifdef CONFIG_HID_WACOM_POWER_SUPPLY
int battery_capacity;
struct power_supply battery;
@ -105,6 +106,7 @@ static int wacom_ac_get_property(struct power_supply *psy,
static void wacom_poke(struct hid_device *hdev, u8 speed)
{
struct wacom_data *wdata = hid_get_drvdata(hdev);
int limit, ret;
char rep_data[2];
@ -128,8 +130,10 @@ static void wacom_poke(struct hid_device *hdev, u8 speed)
HID_FEATURE_REPORT);
} while (ret < 0 && limit-- > 0);
if (ret >= 0)
if (ret >= 0) {
wdata->high_speed = speed;
return;
}
}
/*
@ -141,6 +145,35 @@ static void wacom_poke(struct hid_device *hdev, u8 speed)
return;
}
static ssize_t wacom_show_speed(struct device *dev,
struct device_attribute
*attr, char *buf)
{
struct wacom_data *wdata = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%i\n", wdata->high_speed);
}
static ssize_t wacom_store_speed(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct hid_device *hdev = container_of(dev, struct hid_device, dev);
int new_speed;
if (sscanf(buf, "%1d", &new_speed ) != 1)
return -EINVAL;
if (new_speed == 0 || new_speed == 1) {
wacom_poke(hdev, new_speed);
return strnlen(buf, PAGE_SIZE);
} else
return -EINVAL;
}
static DEVICE_ATTR(speed, S_IRUGO | S_IWUGO,
wacom_show_speed, wacom_store_speed);
static int wacom_raw_event(struct hid_device *hdev, struct hid_report *report,
u8 *raw_data, int size)
{
@ -297,6 +330,11 @@ static int wacom_probe(struct hid_device *hdev,
goto err_free;
}
ret = device_create_file(&hdev->dev, &dev_attr_speed);
if (ret)
dev_warn(&hdev->dev,
"can't create sysfs speed attribute err: %d\n", ret);
/* Set Wacom mode 2 with high reporting speed */
wacom_poke(hdev, 1);