3 files changed, 194 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 6bb9a7d..e1d8003 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -90,6 +90,18 @@ config TOUCHSCREEN_AD7879_SPI
 	  To compile this driver as a module, choose M here: the
 	  module will be called ad7879-spi.
 
+config TOUCHSCREEN_AR1021_I2C
+	tristate "Microchip AR1021 i2c touchscreen"
+	depends on I2C && OF
+	help
+	  Say Y here if you have the Microchip AR1021 touchscreen controller
+	  chip in your system.
+
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ar1021_i2c.
+
 config TOUCHSCREEN_ATMEL_MXT
 	tristate "Atmel mXT I2C Touchscreen"
 	depends on I2C
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 4be94fc..090e61c 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_TOUCHSCREEN_AD7879)	+= ad7879.o
 obj-$(CONFIG_TOUCHSCREEN_AD7879_I2C)	+= ad7879-i2c.o
 obj-$(CONFIG_TOUCHSCREEN_AD7879_SPI)	+= ad7879-spi.o
 obj-$(CONFIG_TOUCHSCREEN_ADS7846)	+= ads7846.o
+obj-$(CONFIG_TOUCHSCREEN_AR1021_I2C)	+= ar1021_i2c.o
 obj-$(CONFIG_TOUCHSCREEN_ATMEL_MXT)	+= atmel_mxt_ts.o
 obj-$(CONFIG_TOUCHSCREEN_AUO_PIXCIR)	+= auo-pixcir-ts.o
 obj-$(CONFIG_TOUCHSCREEN_BU21013)	+= bu21013_ts.o
diff --git a/drivers/input/touchscreen/ar1021_i2c.c b/drivers/input/touchscreen/ar1021_i2c.c
new file mode 100644
index 0000000..ba30578
--- /dev/null
+++ b/drivers/input/touchscreen/ar1021_i2c.c
@@ -0,0 +1,181 @@
+/*
+ * Microchip AR1021 driver for I2C
+ *
+ * Author: Christian Gmeiner <christian.gmeiner@gmail.com>
+ *
+ * License: GPLv2 as published by the FSF.
+ */
+
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/of.h>
+#include <linux/i2c.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+
+#define AR1021_TOCUH_PKG_SIZE	5
+
+#define AR1021_MAX_X	4095
+#define AR1021_MAX_Y	4095
+
+struct ar1021_i2c {
+	struct i2c_client *client;
+	struct input_dev *input;
+	u8 data[AR1021_TOCUH_PKG_SIZE];
+};
+
+static irqreturn_t ar1021_i2c_irq(int irq, void *dev_id)
+{
+	struct ar1021_i2c *ar1021 = dev_id;
+	struct input_dev *input = ar1021->input;
+	u8 *data = ar1021->data;
+	unsigned int x, y, button;
+	int retval;
+
+	retval = i2c_master_recv(ar1021->client,
+				ar1021->data, sizeof(ar1021->data));
+	if (retval != sizeof(ar1021->data))
+		goto out;
+
+	/* sync bit set ? */
+	if ((data[0] & 0x80) == 0)
+		goto out;
+
+	button = data[0] & BIT(0);
+	x = ((data[2] & 0x1f) << 7) | (data[1] & 0x7f);
+	y = ((data[4] & 0x1f) << 7) | (data[3] & 0x7f);
+
+	input_report_abs(input, ABS_X, x);
+	input_report_abs(input, ABS_Y, y);
+	input_report_key(input, BTN_TOUCH, button);
+	input_sync(input);
+
+out:
+	return IRQ_HANDLED;
+}
+
+static int ar1021_i2c_open(struct input_dev *dev)
+{
+	struct ar1021_i2c *ar1021 = input_get_drvdata(dev);
+	struct i2c_client *client = ar1021->client;
+
+	enable_irq(client->irq);
+
+	return 0;
+}
+
+static void ar1021_i2c_close(struct input_dev *dev)
+{
+	struct ar1021_i2c *ar1021 = input_get_drvdata(dev);
+	struct i2c_client *client = ar1021->client;
+
+	disable_irq(client->irq);
+}
+
+static int ar1021_i2c_probe(struct i2c_client *client,
+				     const struct i2c_device_id *id)
+{
+	struct ar1021_i2c *ar1021;
+	struct input_dev *input;
+	int error;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		dev_err(&client->dev, "i2c_check_functionality error\n");
+		return -ENXIO;
+	}
+
+	ar1021 = devm_kzalloc(&client->dev, sizeof(*ar1021), GFP_KERNEL);
+	if (!ar1021)
+		return -ENOMEM;
+
+	input = devm_input_allocate_device(&client->dev);
+	if (!input)
+		return -ENOMEM;
+
+	ar1021->client = client;
+	ar1021->input = input;
+
+	input->name = "ar1021 I2C Touchscreen";
+	input->id.bustype = BUS_I2C;
+	input->dev.parent = &client->dev;
+	input->open = ar1021_i2c_open;
+	input->close = ar1021_i2c_close;
+
+	input_set_capability(input, EV_KEY, BTN_TOUCH);
+	input_set_abs_params(input, ABS_X, 0, AR1021_MAX_X, 0, 0);
+	input_set_abs_params(input, ABS_Y, 0, AR1021_MAX_Y, 0, 0);
+
+	input_set_drvdata(input, ar1021);
+
+	error = devm_request_threaded_irq(&client->dev, client->irq,
+					  NULL, ar1021_i2c_irq,
+					  IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+					  "ar1021_i2c", ar1021);
+	if (error) {
+		dev_err(&client->dev,
+			"Failed to enable IRQ, error: %d\n", error);
+		return error;
+	}
+
+	/* Disable the IRQ, we'll enable it in ar1021_i2c_open() */
+	disable_irq(client->irq);
+
+	error = input_register_device(ar1021->input);
+	if (error) {
+		dev_err(&client->dev,
+			"Failed to register input device, error: %d\n", error);
+		return error;
+	}
+
+	i2c_set_clientdata(client, ar1021);
+	return 0;
+}
+
+static int __maybe_unused ar1021_i2c_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+
+	disable_irq(client->irq);
+
+	return 0;
+}
+
+static int __maybe_unused ar1021_i2c_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+
+	enable_irq(client->irq);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(ar1021_i2c_pm, ar1021_i2c_suspend, ar1021_i2c_resume);
+
+static const struct i2c_device_id ar1021_i2c_id[] = {
+	{ "MICROCHIP_AR1021_I2C", 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(i2c, ar1021_i2c_id);
+
+static struct of_device_id ar1021_i2c_of_match[] = {
+	{ .compatible = "microchip,ar1021-i2c", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ar1021_i2c_of_match);
+
+static struct i2c_driver ar1021_i2c_driver = {
+	.driver	= {
+		.name	= "ar1021_i2c",
+		.owner	= THIS_MODULE,
+		.pm	= &ar1021_i2c_pm,
+		.of_match_table = ar1021_i2c_of_match,
+	},
+
+	.probe		= ar1021_i2c_probe,
+	.id_table	= ar1021_i2c_id,
+};
+module_i2c_driver(ar1021_i2c_driver);
+
+MODULE_AUTHOR("Christian Gmeiner <christian.gmeiner@gmail.com>");
+MODULE_DESCRIPTION("Microchip AR1021 I2C Driver");
+MODULE_LICENSE("GPL");