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authorHenrik Rydberg <rydberg@euromail.se>2010-12-18 20:51:13 +0100
committerHenrik Rydberg <rydberg@euromail.se>2010-12-20 09:37:33 +0100
commit85b7720039fc000b561c20fe2aaa3b54cddae4a7 (patch)
tree8fee2c82e215b87699ad6615239752af50ac9310 /drivers/input/input.c
parent4dd295a73e80b55c3fec25555bf0a5d253023740 (diff)
Input: introduce device properties
Today, userspace sets up an input device based on the data it emits. This is not always enough; a tablet and a touchscreen may emit exactly the same data, for instance, but the former should be set up with a pointer whereas the latter does not need to. Recently, a new type of touchpad has emerged where the buttons are under the pad, which changes logic without changing the emitted data. This patch introduces a new ioctl, EVIOCGPROP, which enables user access to a set of device properties useful during setup. The properties are given as a bitmap in the same fashion as the event types, and are also made available via sysfs, uevent and /proc/bus/input/devices. Acked-by: Ping Cheng <pingc@wacom.com> Acked-by: Chase Douglas <chase.douglas@canonical.com> Acked-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Diffstat (limited to 'drivers/input/input.c')
-rw-r--r--drivers/input/input.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/input/input.c b/drivers/input/input.c
index 37708d1d86ec..9ea713f4192b 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -1095,6 +1095,8 @@ static int input_devices_seq_show(struct seq_file *seq, void *v)
seq_printf(seq, "%s ", handle->name);
seq_putc(seq, '\n');
+ input_seq_print_bitmap(seq, "PROP", dev->propbit, INPUT_PROP_MAX);
+
input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
if (test_bit(EV_KEY, dev->evbit))
input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
@@ -1318,11 +1320,26 @@ static ssize_t input_dev_show_modalias(struct device *dev,
}
static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
+static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
+ int max, int add_cr);
+
+static ssize_t input_dev_show_properties(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct input_dev *input_dev = to_input_dev(dev);
+ int len = input_print_bitmap(buf, PAGE_SIZE, input_dev->propbit,
+ INPUT_PROP_MAX, true);
+ return min_t(int, len, PAGE_SIZE);
+}
+static DEVICE_ATTR(properties, S_IRUGO, input_dev_show_properties, NULL);
+
static struct attribute *input_dev_attrs[] = {
&dev_attr_name.attr,
&dev_attr_phys.attr,
&dev_attr_uniq.attr,
&dev_attr_modalias.attr,
+ &dev_attr_properties.attr,
NULL
};
@@ -1522,6 +1539,8 @@ static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
if (dev->uniq)
INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
+ INPUT_ADD_HOTPLUG_BM_VAR("PROP=", dev->propbit, INPUT_PROP_MAX);
+
INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
if (test_bit(EV_KEY, dev->evbit))
INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);