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authorFrank Praznik <frank.praznik@gmail.com>2016-09-23 03:18:10 +0300
committerJiri Kosina <jkosina@suse.cz>2016-09-26 16:32:48 +0300
commitc4425c8f26aad2b49c5959fad277c9d109fb8ca3 (patch)
tree849a14590c10d05fd3adaf4bbf47c6d639121994 /drivers/hid
parent2a2429327711558aa23fd73d770b6fd5e0d10de7 (diff)
downloadlinux-c4425c8f26aad2b49c5959fad277c9d109fb8ca3.tar.xz
HID: sony: Update copyright and add Dualshock 4 rate control note
Update the copyright notice with the current year and add a note about values for controlling the Dualshock 4 reporting rate. Processing reports at the default full rate of 1000hz can be too demanding for some low-power embedded processors so noting alternate values for people working with this hardware can be useful. Thanks to Rostislav Pehlivanov for finding these values. Signed-off-by: Frank Praznik <frank.praznik@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid')
-rw-r--r--drivers/hid/hid-sony.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/hid/hid-sony.c b/drivers/hid/hid-sony.c
index 9b96f9570531..9bf4e3637ba2 100644
--- a/drivers/hid/hid-sony.c
+++ b/drivers/hid/hid-sony.c
@@ -8,7 +8,7 @@
* Copyright (c) 2012 David Dillow <dave@thedillows.org>
* Copyright (c) 2006-2013 Jiri Kosina
* Copyright (c) 2013 Colin Leitner <colin.leitner@gmail.com>
- * Copyright (c) 2014 Frank Praznik <frank.praznik@gmail.com>
+ * Copyright (c) 2014-2016 Frank Praznik <frank.praznik@gmail.com>
*/
/*
@@ -1879,6 +1879,17 @@ static void dualshock4_send_output_report(struct sony_sc *sc)
u8 *buf = sc->output_report_dmabuf;
int offset;
+ /*
+ * NOTE: The buf[1] field of the Bluetooth report controls
+ * the Dualshock 4 reporting rate.
+ *
+ * Known values include:
+ *
+ * 0x80 - 1000hz (full speed)
+ * 0xA0 - 31hz
+ * 0xB0 - 20hz
+ * 0xD0 - 66hz
+ */
if (sc->quirks & DUALSHOCK4_CONTROLLER_USB) {
memset(buf, 0, DS4_REPORT_0x05_SIZE);
buf[0] = 0x05;