linux-kernel - [PATCH] Input: atmel_mxt_ts: Add hook for Chromebooks with upstream coreboot

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Message-ID: <ccc2fe57-5d0f-4033-063f-9a9e941ef54e@4ray.co>
Date:   Sat, 17 Mar 2018 00:37:53 -0400
From:   Jean Lucas <jean@...y.co>
To:     Nick Dyer <nick@...anahar.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] Input: atmel_mxt_ts: Add hook for Chromebooks with upstream
 coreboot

Chromebooks use coreboot for system initialization. coreboot has always
had the default mainboard vendor string for Google machines set to
"Google". Google engineers set this string to "GOOGLE" in the coreboot
copies of the Chromium OS tree. The atmel_mxt_ts driver in it's current
state is set to match the latter case, i.e. it will only bind to a
Chromebook's touchscreen either if the device uses the downstream
coreboot firmware (providing the matching mainboard vendor string), or
if a user running upstream coreboot has manually set the string to
"GOOGLE". This patch adds a match for coreboot's default.

Signed-off-by: Jean Lucas <jean@...y.co>
---
  drivers/input/touchscreen/atmel_mxt_ts.c | 8 ++++++++
  1 file changed, 8 insertions(+)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 7659bc48f1db..8c74a3e13cca 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -3038,6 +3038,14 @@ static const struct dmi_system_id mxt_dmi_table[] = {
  		},
  		.driver_data = chromebook_platform_data,
  	},
+	{
+		/* Chromebooks with upstream coreboot */
+		.ident = "Chromebook",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Google"),
+		},
+		.driver_data = chromebook_platform_data,
+	},
  	{ }
  };

-- 
2.16.2