This driver is quite simple and only supports the Touch
Reporting Protocol.
Signed-off-by: Christian Gmeiner <christian.gmeiner@xxxxxxxxx>
---
drivers/input/touchscreen/Kconfig | 12 ++
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/ar1021_i2c.c | 201 ++++++++++++++++++++++++++++++++
3 files changed, 214 insertions(+)
create mode 100644 drivers/input/touchscreen/ar1021_i2c.c
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 07e9e82..15cc9a1 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -86,6 +86,18 @@ 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 microchip_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 62801f2..efaa328 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -12,6 +12,7 @@ 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-$(CONFIG_TOUCHSCREEN_ATMEL_TSADCC) += atmel_tsadcc.o
obj-$(CONFIG_TOUCHSCREEN_AUO_PIXCIR) += auo-pixcir-ts.o
diff --git a/drivers/input/touchscreen/ar1021_i2c.c b/drivers/input/touchscreen/ar1021_i2c.c
new file mode 100644
index 0000000..c77ce05
--- /dev/null
+++ b/drivers/input/touchscreen/ar1021_i2c.c
@@ -0,0 +1,201 @@
+/*
+ * Microchip AR1021 driver for I2C
+ *
+ * Author: Christian Gmeiner <christian.gmeiner@xxxxxxxxx>
+ *
+ * License: GPL as published by the FSF.
+ */
+
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/of.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+#include <asm/unaligned.h>
+
+#define AR1021_TOCUH_PKG_SIZE 5
+
+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 error;
+
+ error = i2c_master_recv(ar1021->client,
+ ar1021->data, sizeof(ar1021->data));
+ if (error < 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_key(input, BTN_TOUCH, button);
+ input_report_abs(input, ABS_X, x);
+ input_report_abs(input, ABS_Y, y);
+ input_sync(input);
+
+out:
+ return IRQ_HANDLED;
+}
+
+static int ar1021_i2c_open(struct input_dev *dev)
+{
+ struct ar1021_i2c *wac_i2c = input_get_drvdata(dev);
+ struct i2c_client *client = wac_i2c->client;
+
+ enable_irq(client->irq);
+
+ return 0;
+}
+
+static void ar1021_i2c_close(struct input_dev *dev)
+{
+ struct ar1021_i2c *wac_i2c = input_get_drvdata(dev);
+ struct i2c_client *client = wac_i2c->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 -EIO;
+ }
+
+ ar1021 = devm_kzalloc(client->dev, sizeof(*ar1021), GFP_KERNEL);
+ input = input_allocate_device();
+ if (!ar1021 || !input) {
+ error = -ENOMEM;
+ goto err_free_mem;
+ }
+
+ 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->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+
+ __set_bit(BTN_TOOL_PEN, input->keybit);
+
+ input_set_abs_params(input, ABS_X, 0, 4095, 0, 0);
+ input_set_abs_params(input, ABS_Y, 0, 4095, 0, 0);
+
+ input_set_drvdata(input, ar1021);
+
+ error = request_threaded_irq(client->irq, NULL, ar1021_i2c_irq,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ "ar1021_i2c", ar1021);
+ if (error) {
+ dev_err(&client->dev,
+ "Failed to enable IRQ, error: %d\n", error);
+ goto err_free_mem;
+ }
+
+ /* Disable the IRQ, we'll enable it in wac_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);
+ goto err_free_irq;
+ }
+
+ i2c_set_clientdata(client, ar1021);
+ return 0;
+
+err_free_irq:
+ free_irq(client->irq, ar1021);
+err_free_mem:
+ input_free_device(input);
+
+ return error;
+}
+
+static int ar1021_i2c_remove(struct i2c_client *client)
+{
+ struct ar1021_i2c *ar1021 = i2c_get_clientdata(client);
+
+ free_irq(client->irq, ar1021);
+ input_unregister_device(ar1021->input);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int ar1021_i2c_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ disable_irq(client->irq);
+
+ return 0;
+}
+
+static int ar1021_i2c_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ enable_irq(client->irq);
+
+ return 0;
+}
+#endif
+
+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);
+
+#ifdef CONFIG_OF
+static struct of_device_id ar1021_i2c_of_match[] = {
+ { .compatible = "mc,ar1021-i2c", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, ar1021_i2c_of_match);
+#endif
+
+static struct i2c_driver ar1021_i2c_driver = {
+ .driver = {
+ .name = "ar1021_i2c",
+ .owner = THIS_MODULE,
+ .pm = &ar1021_i2c_pm,
+ .of_match_table = of_match_ptr(ar1021_i2c_of_match),
+ },
+
+ .probe = ar1021_i2c_probe,
+ .remove = ar1021_i2c_remove,
+ .id_table = ar1021_i2c_id,
+};
+module_i2c_driver(ar1021_i2c_driver);
+
+MODULE_AUTHOR("Christian Gmeiner <christian.gmeiner@xxxxxxxxx>");
+MODULE_DESCRIPTION("Microchip AR1021 I2C Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:ar1021_i2c");
--
1.7.10.4
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