Re: [PATCH] Input: goodix: Add support for capacitive home button found on some x86 tablets
flat view
From: Sergei A. Trusov <hidden>
Date: 2017-06-20 10:10:57
Subsystem:
goodix touchscreen, input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
Hans de Goede, Dmitry Torokhov, Linus Torvalds
On Tuesday, 20 June 2017 19:29:01 +10 Bastien Nocera wrote:
On Tue, 2017-06-20 at 19:26 +1000, Sergei A. Trusov wrote:quoted
<snip>quoted
Thank you for this point. Now I see all the changes above are redundant: we can use a value returned in the *data buffer. It is enough to add only two lines of code to achieve the behaviour of this entire patch.A bit more with a comment explaining the reason behind those 2 lines, but shorter patches get my vote ;)
Current goodix_ts_read_input_report() function puts data from hardware into point_data buffer. Then in masks high niblle of the first byte and returns it as touch_num. We need this masked nibble to check, so I was trying to remove mask operation. After your comment I just realized that proposed patch should be much shorter. I have included more context lines to make cleaner my attempts to explain (as I am affraid my English is not so good): ---
diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c
index 240b16f3ee97..0c3825c39288 100644
--- a/drivers/input/touchscreen/goodix.c
+++ b/drivers/input/touchscreen/goodix.c@@ -262,16 +262,18 @@ static void goodix_process_events(struct goodix_ts_data *ts) u8 point_data[1 + GOODIX_CONTACT_SIZE * GOODIX_MAX_CONTACTS]; int touch_num; int i; touch_num = goodix_ts_read_input_report(ts, point_data); if (touch_num < 0) return; + input_report_key(ts->input_dev, KEY_LEFTMETA, !!(point_data[0] & 0x10)); + for (i = 0; i < touch_num; i++) goodix_ts_report_touch(ts, &point_data[1 + GOODIX_CONTACT_SIZE * i]); input_mt_sync_frame(ts->input_dev); input_sync(ts->input_dev); }
@@ -607,16 +609,18 @@ static int goodix_request_input_dev(struct goodix_ts_data *ts) ts->input_dev->name = "Goodix Capacitive TouchScreen"; ts->input_dev->phys = "input/ts"; ts->input_dev->id.bustype = BUS_I2C; ts->input_dev->id.vendor = 0x0416; ts->input_dev->id.product = ts->id; ts->input_dev->id.version = ts->version; + input_set_capability(ts->input_dev, EV_KEY, KEY_LEFTMETA); + error = input_register_device(ts->input_dev); if (error) { dev_err(&ts->client->dev, "Failed to register input device: %d", error); return error; } return 0;