From 20a3ce7e490c5015d051f78414f6dd146eec283f Mon Sep 17 00:00:00 2001 From: Przemo Firszt Date: Thu, 18 Mar 2010 14:34:34 +0000 Subject: [PATCH] HID: add sysfs speed attribute for wacom bluetooth tablet 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 Signed-off-by: Jiri Kosina --- drivers/hid/hid-wacom.c | 40 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 39 insertions(+), 1 deletion(-) diff --git a/drivers/hid/hid-wacom.c b/drivers/hid/hid-wacom.c index f9d493931b02..97ef6260fda0 100644 --- a/drivers/hid/hid-wacom.c +++ b/drivers/hid/hid-wacom.c @@ -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); -- 2.30.2