Writing "none" will disable all protocols.
Write fails with EINVAL if an invalid protocol combination or
unknown protocol name is used.
+
+What: /sys/class/rc/rcN/filter
+Date: Jan 2014
+KernelVersion: 3.15
+Contact: Mauro Carvalho Chehab <m.chehab@samsung.com>
+Description:
+ Sets the scancode filter expected value.
+ Use in combination with /sys/class/rc/rcN/filter_mask to set the
+ expected value of the bits set in the filter mask.
+ If the hardware supports it then scancodes which do not match
+ the filter will be ignored. Otherwise the write will fail with
+ an error.
+ This value may be reset to 0 if the current protocol is altered.
+
+What: /sys/class/rc/rcN/filter_mask
+Date: Jan 2014
+KernelVersion: 3.15
+Contact: Mauro Carvalho Chehab <m.chehab@samsung.com>
+Description:
+ Sets the scancode filter mask of bits to compare.
+ Use in combination with /sys/class/rc/rcN/filter to set the bits
+ of the scancode which should be compared against the expected
+ value. A value of 0 disables the filter to allow all valid
+ scancodes to be processed.
+ If the hardware supports it then scancodes which do not match
+ the filter will be ignored. Otherwise the write will fail with
+ an error.
+ This value may be reset to 0 if the current protocol is altered.
+
+What: /sys/class/rc/rcN/wakeup_filter
+Date: Jan 2014
+KernelVersion: 3.15
+Contact: Mauro Carvalho Chehab <m.chehab@samsung.com>
+Description:
+ Sets the scancode wakeup filter expected value.
+ Use in combination with /sys/class/rc/rcN/wakeup_filter_mask to
+ set the expected value of the bits set in the wakeup filter mask
+ to trigger a system wake event.
+ If the hardware supports it and wakeup_filter_mask is not 0 then
+ scancodes which match the filter will wake the system from e.g.
+ suspend to RAM or power off.
+ Otherwise the write will fail with an error.
+ This value may be reset to 0 if the current protocol is altered.
+
+What: /sys/class/rc/rcN/wakeup_filter_mask
+Date: Jan 2014
+KernelVersion: 3.15
+Contact: Mauro Carvalho Chehab <m.chehab@samsung.com>
+Description:
+ Sets the scancode wakeup filter mask of bits to compare.
+ Use in combination with /sys/class/rc/rcN/wakeup_filter to set
+ the bits of the scancode which should be compared against the
+ expected value to trigger a system wake event.
+ If the hardware supports it and wakeup_filter_mask is not 0 then
+ scancodes which match the filter will wake the system from e.g.
+ suspend to RAM or power off.
+ Otherwise the write will fail with an error.
+ This value may be reset to 0 if the current protocol is altered.
return ret;
}
+/**
+ * struct rc_filter_attribute - Device attribute relating to a filter type.
+ * @attr: Device attribute.
+ * @type: Filter type.
+ * @mask: false for filter value, true for filter mask.
+ */
+struct rc_filter_attribute {
+ struct device_attribute attr;
+ enum rc_filter_type type;
+ bool mask;
+};
+#define to_rc_filter_attr(a) container_of(a, struct rc_filter_attribute, attr)
+
+#define RC_FILTER_ATTR(_name, _mode, _show, _store, _type, _mask) \
+ struct rc_filter_attribute dev_attr_##_name = { \
+ .attr = __ATTR(_name, _mode, _show, _store), \
+ .type = (_type), \
+ .mask = (_mask), \
+ }
+
+/**
+ * show_filter() - shows the current scancode filter value or mask
+ * @device: the device descriptor
+ * @attr: the device attribute struct
+ * @buf: a pointer to the output buffer
+ *
+ * This routine is a callback routine to read a scancode filter value or mask.
+ * It is trigged by reading /sys/class/rc/rc?/[wakeup_]filter[_mask].
+ * It prints the current scancode filter value or mask of the appropriate filter
+ * type in hexadecimal into @buf and returns the size of the buffer.
+ *
+ * Bits of the filter value corresponding to set bits in the filter mask are
+ * compared against input scancodes and non-matching scancodes are discarded.
+ *
+ * dev->lock is taken to guard against races between device registration,
+ * store_filter and show_filter.
+ */
+static ssize_t show_filter(struct device *device,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct rc_dev *dev = to_rc_dev(device);
+ struct rc_filter_attribute *fattr = to_rc_filter_attr(attr);
+ u32 val;
+
+ /* Device is being removed */
+ if (!dev)
+ return -EINVAL;
+
+ mutex_lock(&dev->lock);
+ if (!dev->s_filter)
+ val = 0;
+ else if (fattr->mask)
+ val = dev->scancode_filters[fattr->type].mask;
+ else
+ val = dev->scancode_filters[fattr->type].data;
+ mutex_unlock(&dev->lock);
+
+ return sprintf(buf, "%#x\n", val);
+}
+
+/**
+ * store_filter() - changes the scancode filter value
+ * @device: the device descriptor
+ * @attr: the device attribute struct
+ * @buf: a pointer to the input buffer
+ * @len: length of the input buffer
+ *
+ * This routine is for changing a scancode filter value or mask.
+ * It is trigged by writing to /sys/class/rc/rc?/[wakeup_]filter[_mask].
+ * Returns -EINVAL if an invalid filter value for the current protocol was
+ * specified or if scancode filtering is not supported by the driver, otherwise
+ * returns @len.
+ *
+ * Bits of the filter value corresponding to set bits in the filter mask are
+ * compared against input scancodes and non-matching scancodes are discarded.
+ *
+ * dev->lock is taken to guard against races between device registration,
+ * store_filter and show_filter.
+ */
+static ssize_t store_filter(struct device *device,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ struct rc_dev *dev = to_rc_dev(device);
+ struct rc_filter_attribute *fattr = to_rc_filter_attr(attr);
+ struct rc_scancode_filter local_filter, *filter;
+ int ret;
+ unsigned long val;
+
+ /* Device is being removed */
+ if (!dev)
+ return -EINVAL;
+
+ ret = kstrtoul(buf, 0, &val);
+ if (ret < 0)
+ return ret;
+
+ /* Scancode filter not supported (but still accept 0) */
+ if (!dev->s_filter)
+ return val ? -EINVAL : count;
+
+ mutex_lock(&dev->lock);
+
+ /* Tell the driver about the new filter */
+ filter = &dev->scancode_filters[fattr->type];
+ local_filter = *filter;
+ if (fattr->mask)
+ local_filter.mask = val;
+ else
+ local_filter.data = val;
+ ret = dev->s_filter(dev, fattr->type, &local_filter);
+ if (ret < 0)
+ goto unlock;
+
+ /* Success, commit the new filter */
+ *filter = local_filter;
+
+unlock:
+ mutex_unlock(&dev->lock);
+ return count;
+}
+
static void rc_dev_release(struct device *device)
{
}
*/
static DEVICE_ATTR(protocols, S_IRUGO | S_IWUSR,
show_protocols, store_protocols);
+static RC_FILTER_ATTR(filter, S_IRUGO|S_IWUSR,
+ show_filter, store_filter, RC_FILTER_NORMAL, false);
+static RC_FILTER_ATTR(filter_mask, S_IRUGO|S_IWUSR,
+ show_filter, store_filter, RC_FILTER_NORMAL, true);
+static RC_FILTER_ATTR(wakeup_filter, S_IRUGO|S_IWUSR,
+ show_filter, store_filter, RC_FILTER_WAKEUP, false);
+static RC_FILTER_ATTR(wakeup_filter_mask, S_IRUGO|S_IWUSR,
+ show_filter, store_filter, RC_FILTER_WAKEUP, true);
static struct attribute *rc_dev_attrs[] = {
&dev_attr_protocols.attr,
+ &dev_attr_filter.attr.attr,
+ &dev_attr_filter_mask.attr.attr,
+ &dev_attr_wakeup_filter.attr.attr,
+ &dev_attr_wakeup_filter_mask.attr.attr,
NULL,
};
};
/**
+ * struct rc_scancode_filter - Filter scan codes.
+ * @data: Scancode data to match.
+ * @mask: Mask of bits of scancode to compare.
+ */
+struct rc_scancode_filter {
+ u32 data;
+ u32 mask;
+};
+
+/**
+ * enum rc_filter_type - Filter type constants.
+ * @RC_FILTER_NORMAL: Filter for normal operation.
+ * @RC_FILTER_WAKEUP: Filter for waking from suspend.
+ * @RC_FILTER_MAX: Number of filter types.
+ */
+enum rc_filter_type {
+ RC_FILTER_NORMAL = 0,
+ RC_FILTER_WAKEUP,
+
+ RC_FILTER_MAX
+};
+
+/**
* struct rc_dev - represents a remote control device
* @dev: driver model's view of this device
* @input_name: name of the input child device
* @max_timeout: maximum timeout supported by device
* @rx_resolution : resolution (in ns) of input sampler
* @tx_resolution: resolution (in ns) of output sampler
+ * @scancode_filters: scancode filters (indexed by enum rc_filter_type)
* @change_protocol: allow changing the protocol used on hardware decoders
* @open: callback to allow drivers to enable polling/irq when IR input device
* is opened.
* device doesn't interrupt host until it sees IR pulses
* @s_learning_mode: enable wide band receiver used for learning
* @s_carrier_report: enable carrier reports
+ * @s_filter: set the scancode filter of a given type
*/
struct rc_dev {
struct device dev;
u32 max_timeout;
u32 rx_resolution;
u32 tx_resolution;
+ struct rc_scancode_filter scancode_filters[RC_FILTER_MAX];
int (*change_protocol)(struct rc_dev *dev, u64 *rc_type);
int (*open)(struct rc_dev *dev);
void (*close)(struct rc_dev *dev);
void (*s_idle)(struct rc_dev *dev, bool enable);
int (*s_learning_mode)(struct rc_dev *dev, int enable);
int (*s_carrier_report) (struct rc_dev *dev, int enable);
+ int (*s_filter)(struct rc_dev *dev,
+ enum rc_filter_type type,
+ struct rc_scancode_filter *filter);
};
#define to_rc_dev(d) container_of(d, struct rc_dev, dev)
projects / platform / kernel / linux-rpi.git / commitdiff