This patch adds the helper hidinput_led_output_report to handle LED
input events.
This helper implements a generic handler for LED input events. It
basically sets the proper field, builds the output report and call
hid_output_raw_report callback to send the raw report to the device.
Signed-off-by: Andre Guedes <andre.guedes@xxxxxxxxxxxxx>
---
drivers/hid/hid-input.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/hid.h | 2 ++
2 files changed, 53 insertions(+)
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 21b196c..957f510 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -1300,3 +1300,54 @@ void hidinput_disconnect(struct hid_device *hid)
}
EXPORT_SYMBOL_GPL(hidinput_disconnect);
+/*
+ * hidinput_led_output_report - Generic handler for LED input events
+ *
+ * @hid: hid device
+ * @code: input event code
+ * @value: input event value
+ *
+ * This function implements a generic handler for LED input events. It
+ * sets the proper LED field, builds the output report and sends it to
+ * device.
+ *
+ * This helper relies on device's .hid_output_raw_report() to send
+ * reports to the device.
+ */
+int hidinput_led_output_report(struct hid_device *hid, unsigned int code,
+ int value)
+{
+ int offset;
+ struct hid_field *field;
+ struct hid_report *report;
+ u8 *buf;
+ int len;
+ int ret;
+
+ if (!hid->hid_output_raw_report)
+ return -ENOTSUPP;
+
+ offset = hidinput_find_field(hid, EV_LED, code, &field);
+ if (offset == -1)
+ return -ENOENT;
+
+ hid_set_field(field, offset, value);
+
+ report = field->report;
+
+ len = ((report->size - 1) >> 3) + 1 + (report->id > 0);
+
+ buf = kzalloc(len, GFP_ATOMIC);
+ if (!buf)
+ return -ENOMEM;
+
+ hid_output_report(report, buf);
+
+ ret = hid->hid_output_raw_report(hid, buf, len, HID_OUTPUT_REPORT);
+
+ kfree(buf);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(hidinput_led_output_report);
+
diff --git a/include/linux/hid.h b/include/linux/hid.h
index d2c42dd..bd02df3 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -701,6 +701,8 @@ extern void hidinput_hid_event(struct hid_device *, struct hid_field *, struct h
extern void hidinput_report_event(struct hid_device *hid, struct hid_report *report);
extern int hidinput_connect(struct hid_device *hid, unsigned int force);
extern void hidinput_disconnect(struct hid_device *);
+extern int hidinput_led_output_report(struct hid_device *hid,
+ unsigned int code, int value);
int hid_set_field(struct hid_field *, unsigned, __s32);
int hid_input_report(struct hid_device *, int type, u8 *, int, int);
--
1.8.0.1
--
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