From 883a2a80f79ca5c0c105605fafabd1f3df99b34c Mon Sep 17 00:00:00 2001 From: Kai-Heng Feng Date: Mon, 22 Jul 2019 10:56:55 +0300 Subject: [PATCH] Input: elantech - enable SMBus on new (2018+) systems There are some new HP laptops with Elantech touchpad that don't support multitouch. Currently we use ETP_NEW_IC_SMBUS_HOST_NOTIFY() to check if SMBus is supported, but in addition to firmware version, the bus type also informs us whether the IC can support SMBus. To avoid breaking old ICs, we will only enable SMbus support based the bus type on systems manufactured after 2018. Lastly, let's consolidate all checks into elantech_use_host_notify() and use it to determine whether to use PS/2 or SMBus. Signed-off-by: Kai-Heng Feng Acked-by: Benjamin Tissoires Cc: stable@vger.kernel.org Signed-off-by: Dmitry Torokhov --- drivers/input/mouse/elantech.c | 54 +++++++++++++++++++----------------------- 1 file changed, 25 insertions(+), 29 deletions(-) diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c index 2d8434b..7354477 100644 --- a/drivers/input/mouse/elantech.c +++ b/drivers/input/mouse/elantech.c @@ -1827,6 +1827,30 @@ static int elantech_create_smbus(struct psmouse *psmouse, leave_breadcrumbs); } +static bool elantech_use_host_notify(struct psmouse *psmouse, + struct elantech_device_info *info) +{ + if (ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version)) + return true; + + switch (info->bus) { + case ETP_BUS_PS2_ONLY: + /* expected case */ + break; + case ETP_BUS_SMB_HST_NTFY_ONLY: + case ETP_BUS_PS2_SMB_HST_NTFY: + /* SMbus implementation is stable since 2018 */ + if (dmi_get_bios_year() >= 2018) + return true; + default: + psmouse_dbg(psmouse, + "Ignoring SMBus bus provider %d\n", info->bus); + break; + } + + return false; +} + /** * elantech_setup_smbus - called once the PS/2 devices are enumerated * and decides to instantiate a SMBus InterTouch device. @@ -1846,7 +1870,7 @@ static int elantech_setup_smbus(struct psmouse *psmouse, * i2c_blacklist_pnp_ids. * Old ICs are up to the user to decide. */ - if (!ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version) || + if (!elantech_use_host_notify(psmouse, info) || psmouse_matches_pnp_id(psmouse, i2c_blacklist_pnp_ids)) return -ENXIO; } @@ -1866,34 +1890,6 @@ static int elantech_setup_smbus(struct psmouse *psmouse, return 0; } -static bool elantech_use_host_notify(struct psmouse *psmouse, - struct elantech_device_info *info) -{ - if (ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version)) - return true; - - switch (info->bus) { - case ETP_BUS_PS2_ONLY: - /* expected case */ - break; - case ETP_BUS_SMB_ALERT_ONLY: - /* fall-through */ - case ETP_BUS_PS2_SMB_ALERT: - psmouse_dbg(psmouse, "Ignoring SMBus provider through alert protocol.\n"); - break; - case ETP_BUS_SMB_HST_NTFY_ONLY: - /* fall-through */ - case ETP_BUS_PS2_SMB_HST_NTFY: - return true; - default: - psmouse_dbg(psmouse, - "Ignoring SMBus bus provider %d.\n", - info->bus); - } - - return false; -} - int elantech_init_smbus(struct psmouse *psmouse) { struct elantech_device_info info; -- 2.7.4