Input: goodix-berlin - add I2C support for Goodix Berlin Touchscreen IC

Add initial support for the new Goodix "Berlin" touchscreen ICs
over the I2C interface.

This initial driver is derived from the Goodix goodix_ts_berlin
available at [1] and [2] and only supports the GT9916 IC
present on the Qualcomm SM8550 MTP & QRD touch panel.

The current implementation only supports BerlinD, aka GT9916.

[1] https://github.com/goodix/goodix_ts_berlin
[2] https://git.codelinaro.org/clo/la/platform/vendor/opensource/touch-drivers

Reviewed-by: Jeff LaBundy <jeff@labundy.com>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20240129-topic-goodix-berlin-upstream-initial-v15-3-6f7d096c0a0a@linaro.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 950da599ae1a854c372d58c9396722d2ad5de6ab..cc7b8811815863aaa99d6a1e7a213030f1b46f8e 100644 (file)
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -419,6 +419,20 @@ config TOUCHSCREEN_GOODIX
 config TOUCHSCREEN_GOODIX_BERLIN_CORE
        tristate
 
+config TOUCHSCREEN_GOODIX_BERLIN_I2C
+       tristate "Goodix Berlin I2C touchscreen"
+       depends on I2C
+       select REGMAP_I2C
+       select TOUCHSCREEN_GOODIX_BERLIN_CORE
+       help
+         Say Y here if you have a Goodix Berlin IC connected to
+         your system via I2C.
+
+         If unsure, say N.
+
+         To compile this driver as a module, choose M here: the
+         module will be called goodix_berlin_i2c.
+
 config TOUCHSCREEN_HIDEEP
        tristate "HiDeep Touch IC"
        depends on I2C

diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 2e2f3e70cd2c4548d9ed3770945f7acbb12c04a3..7ef677cf7a1048afdc9135c84019fa2b226a30a8 100644 (file)
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -48,6 +48,7 @@ obj-$(CONFIG_TOUCHSCREEN_EXC3000)     += exc3000.o
 obj-$(CONFIG_TOUCHSCREEN_FUJITSU)      += fujitsu_ts.o
 obj-$(CONFIG_TOUCHSCREEN_GOODIX)       += goodix_ts.o
 obj-$(CONFIG_TOUCHSCREEN_GOODIX_BERLIN_CORE)   += goodix_berlin_core.o
+obj-$(CONFIG_TOUCHSCREEN_GOODIX_BERLIN_I2C)    += goodix_berlin_i2c.o
 obj-$(CONFIG_TOUCHSCREEN_HIDEEP)       += hideep.o
 obj-$(CONFIG_TOUCHSCREEN_HYNITRON_CSTXXX)      += hynitron_cstxxx.o
 obj-$(CONFIG_TOUCHSCREEN_ILI210X)      += ili210x.o

diff --git a/drivers/input/touchscreen/goodix_berlin_i2c.c b/drivers/input/touchscreen/goodix_berlin_i2c.c
new file mode 100644 (file)
index 0000000..6ed9aa8
--- /dev/null
+++ b/drivers/input/touchscreen/goodix_berlin_i2c.c
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Goodix Berlin Touchscreen Driver
+ *
+ * Copyright (C) 2020 - 2021 Goodix, Inc.
+ * Copyright (C) 2023 Linaro Ltd.
+ *
+ * Based on goodix_ts_berlin driver.
+ */
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/input.h>
+
+#include "goodix_berlin.h"
+
+#define I2C_MAX_TRANSFER_SIZE          256
+
+static const struct regmap_config goodix_berlin_i2c_regmap_conf = {
+       .reg_bits = 32,
+       .val_bits = 8,
+       .max_raw_read = I2C_MAX_TRANSFER_SIZE,
+       .max_raw_write = I2C_MAX_TRANSFER_SIZE,
+};
+
+/* vendor & product left unassigned here, should probably be updated from fw info */
+static const struct input_id goodix_berlin_i2c_input_id = {
+       .bustype = BUS_I2C,
+};
+
+static int goodix_berlin_i2c_probe(struct i2c_client *client)
+{
+       struct regmap *regmap;
+       int error;
+
+       regmap = devm_regmap_init_i2c(client, &goodix_berlin_i2c_regmap_conf);
+       if (IS_ERR(regmap))
+               return PTR_ERR(regmap);
+
+       error = goodix_berlin_probe(&client->dev, client->irq,
+                                   &goodix_berlin_i2c_input_id, regmap);
+       if (error)
+               return error;
+
+       return 0;
+}
+
+static const struct i2c_device_id goodix_berlin_i2c_id[] = {
+       { "gt9916", 0 },
+       { }
+};
+
+MODULE_DEVICE_TABLE(i2c, goodix_berlin_i2c_id);
+
+static const struct of_device_id goodix_berlin_i2c_of_match[] = {
+       { .compatible = "goodix,gt9916", },
+       { }
+};
+MODULE_DEVICE_TABLE(of, goodix_berlin_i2c_of_match);
+
+static struct i2c_driver goodix_berlin_i2c_driver = {
+       .driver = {
+               .name = "goodix-berlin-i2c",
+               .of_match_table = goodix_berlin_i2c_of_match,
+               .pm = pm_sleep_ptr(&goodix_berlin_pm_ops),
+       },
+       .probe = goodix_berlin_i2c_probe,
+       .id_table = goodix_berlin_i2c_id,
+};
+module_i2c_driver(goodix_berlin_i2c_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Goodix Berlin I2C Touchscreen driver");
+MODULE_AUTHOR("Neil Armstrong <neil.armstrong@linaro.org>");