Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / input / touchscreen / ar1021_i2c.c

diff --git a/kernel/drivers/input/touchscreen/ar1021_i2c.c b/kernel/drivers/input/touchscreen/ar1021_i2c.c
new file mode 100644 (file)
index 0000000..f0b954d
--- /dev/null
+++ b/kernel/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 const 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");