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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/input/touchscreen/ar1021_i2c.c
Initial import
Diffstat (limited to 'drivers/input/touchscreen/ar1021_i2c.c')
-rw-r--r--drivers/input/touchscreen/ar1021_i2c.c181
1 files changed, 181 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/ar1021_i2c.c b/drivers/input/touchscreen/ar1021_i2c.c
new file mode 100644
index 000000000..f0b954d46
--- /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 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");