From f097deef59a60109648efd48f6c9fe7f56966938 Mon Sep 17 00:00:00 2001 From: Andrew Duggan Date: Tue, 24 Feb 2015 17:36:50 -0800 Subject: [PATCH] HID: rmi: disable palm detect gesture when present A touchpad may have firmware based palm detection code enabled which suppresses 2D data from being reported when the firmware believes a palm is on the touchpad. This functionality is meant to be used in mouse mode without a driver. When a driver is present, the driver can do a better job of determining if a contact is a palm. If this gesture is enabled on a touchpad operating in rmi mode then the firmware will not properly clear the palm detect interrupt, causing the touchpad to interrupt indefinately. This patch disables the palm detect gesture when the touchpad is operating in rmi mode. Signed-off-by: Andrew Duggan Tested-by: Gabriele Mazzotta Signed-off-by: Jiri Kosina --- drivers/hid/hid-rmi.c | 19 ++++++++++++++++--- 1 file changed, 16 insertions(+), 3 deletions(-) diff --git a/drivers/hid/hid-rmi.c b/drivers/hid/hid-rmi.c index 6e74eae6b652..368ffdf2c0a3 100644 --- a/drivers/hid/hid-rmi.c +++ b/drivers/hid/hid-rmi.c @@ -752,6 +752,7 @@ static int rmi_populate_f11(struct hid_device *hdev) bool has_rel; bool has_data40 = false; bool has_dribble = false; + bool has_palm_detect = false; unsigned x_size, y_size; u16 query_offset; @@ -820,6 +821,7 @@ static int rmi_populate_f11(struct hid_device *hdev) ret); return ret; } + has_palm_detect = !!(buf[0] & BIT(0)); has_query10 = !!(buf[0] & BIT(2)); query_offset += 2; /* query 7 and 8 are present */ @@ -906,11 +908,11 @@ static int rmi_populate_f11(struct hid_device *hdev) * retrieve the ctrl registers * the ctrl register has a size of 20 but a fw bug split it into 16 + 4, * and there is no way to know if the first 20 bytes are here or not. - * We use only the first 10 bytes, so get only them. + * We use only the first 12 bytes, so get only them. */ - ret = rmi_read_block(hdev, data->f11.control_base_addr, buf, 10); + ret = rmi_read_block(hdev, data->f11.control_base_addr, buf, 12); if (ret) { - hid_err(hdev, "can not read ctrl block of size 10: %d.\n", ret); + hid_err(hdev, "can not read ctrl block of size 11: %d.\n", ret); return ret; } @@ -927,6 +929,17 @@ static int rmi_populate_f11(struct hid_device *hdev) } } + if (has_palm_detect) { + buf[11] = buf[11] & ~BIT(0); + ret = rmi_write(hdev, data->f11.control_base_addr + 11, + &buf[11]); + if (ret) { + hid_err(hdev, "can not write to control reg 11: %d.\n", + ret); + return ret; + } + } + return 0; }