Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 271 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/chipone_icn8318.c b/drivers/input/touchscreen/chipone_icn8318.c
new file mode 100644
index 0000000000..d6876d10b2
--- /dev/null
+++ b/drivers/input/touchscreen/chipone_icn8318.c
@@ -0,0 +1,271 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for ChipOne icn8318 i2c touchscreen controller
+ *
+ * Copyright (c) 2015 Red Hat Inc.
+ *
+ * Red Hat authors:
+ * Hans de Goede <hdegoede@redhat.com>
+ */
+
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+#define ICN8318_REG_POWER		4
+#define ICN8318_REG_TOUCHDATA		16
+
+#define ICN8318_POWER_ACTIVE		0
+#define ICN8318_POWER_MONITOR		1
+#define ICN8318_POWER_HIBERNATE		2
+
+#define ICN8318_MAX_TOUCHES		5
+
+struct icn8318_touch {
+	__u8 slot;
+	__be16 x;
+	__be16 y;
+	__u8 pressure;	/* Seems more like finger width then pressure really */
+	__u8 event;
+/* The difference between 2 and 3 is unclear */
+#define ICN8318_EVENT_NO_DATA	1 /* No finger seen yet since wakeup */
+#define ICN8318_EVENT_UPDATE1	2 /* New or updated coordinates */
+#define ICN8318_EVENT_UPDATE2	3 /* New or updated coordinates */
+#define ICN8318_EVENT_END	4 /* Finger lifted */
+} __packed;
+
+struct icn8318_touch_data {
+	__u8 softbutton;
+	__u8 touch_count;
+	struct icn8318_touch touches[ICN8318_MAX_TOUCHES];
+} __packed;
+
+struct icn8318_data {
+	struct i2c_client *client;
+	struct input_dev *input;
+	struct gpio_desc *wake_gpio;
+	struct touchscreen_properties prop;
+};
+
+static int icn8318_read_touch_data(struct i2c_client *client,
+				   struct icn8318_touch_data *touch_data)
+{
+	u8 reg = ICN8318_REG_TOUCHDATA;
+	struct i2c_msg msg[2] = {
+		{
+			.addr = client->addr,
+			.len = 1,
+			.buf = &reg
+		},
+		{
+			.addr = client->addr,
+			.flags = I2C_M_RD,
+			.len = sizeof(struct icn8318_touch_data),
+			.buf = (u8 *)touch_data
+		}
+	};
+
+	return i2c_transfer(client->adapter, msg, 2);
+}
+
+static inline bool icn8318_touch_active(u8 event)
+{
+	return (event == ICN8318_EVENT_UPDATE1) ||
+	       (event == ICN8318_EVENT_UPDATE2);
+}
+
+static irqreturn_t icn8318_irq(int irq, void *dev_id)
+{
+	struct icn8318_data *data = dev_id;
+	struct device *dev = &data->client->dev;
+	struct icn8318_touch_data touch_data;
+	int i, ret;
+
+	ret = icn8318_read_touch_data(data->client, &touch_data);
+	if (ret < 0) {
+		dev_err(dev, "Error reading touch data: %d\n", ret);
+		return IRQ_HANDLED;
+	}
+
+	if (touch_data.softbutton) {
+		/*
+		 * Other data is invalid when a softbutton is pressed.
+		 * This needs some extra devicetree bindings to map the icn8318
+		 * softbutton codes to evdev codes. Currently no known devices
+		 * use this.
+		 */
+		return IRQ_HANDLED;
+	}
+
+	if (touch_data.touch_count > ICN8318_MAX_TOUCHES) {
+		dev_warn(dev, "Too much touches %d > %d\n",
+			 touch_data.touch_count, ICN8318_MAX_TOUCHES);
+		touch_data.touch_count = ICN8318_MAX_TOUCHES;
+	}
+
+	for (i = 0; i < touch_data.touch_count; i++) {
+		struct icn8318_touch *touch = &touch_data.touches[i];
+		bool act = icn8318_touch_active(touch->event);
+
+		input_mt_slot(data->input, touch->slot);
+		input_mt_report_slot_state(data->input, MT_TOOL_FINGER, act);
+		if (!act)
+			continue;
+
+		touchscreen_report_pos(data->input, &data->prop,
+				       be16_to_cpu(touch->x),
+				       be16_to_cpu(touch->y), true);
+	}
+
+	input_mt_sync_frame(data->input);
+	input_sync(data->input);
+
+	return IRQ_HANDLED;
+}
+
+static int icn8318_start(struct input_dev *dev)
+{
+	struct icn8318_data *data = input_get_drvdata(dev);
+
+	enable_irq(data->client->irq);
+	gpiod_set_value_cansleep(data->wake_gpio, 1);
+
+	return 0;
+}
+
+static void icn8318_stop(struct input_dev *dev)
+{
+	struct icn8318_data *data = input_get_drvdata(dev);
+
+	disable_irq(data->client->irq);
+	i2c_smbus_write_byte_data(data->client, ICN8318_REG_POWER,
+				  ICN8318_POWER_HIBERNATE);
+	gpiod_set_value_cansleep(data->wake_gpio, 0);
+}
+
+static int icn8318_suspend(struct device *dev)
+{
+	struct icn8318_data *data = i2c_get_clientdata(to_i2c_client(dev));
+
+	mutex_lock(&data->input->mutex);
+	if (input_device_enabled(data->input))
+		icn8318_stop(data->input);
+	mutex_unlock(&data->input->mutex);
+
+	return 0;
+}
+
+static int icn8318_resume(struct device *dev)
+{
+	struct icn8318_data *data = i2c_get_clientdata(to_i2c_client(dev));
+
+	mutex_lock(&data->input->mutex);
+	if (input_device_enabled(data->input))
+		icn8318_start(data->input);
+	mutex_unlock(&data->input->mutex);
+
+	return 0;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(icn8318_pm_ops, icn8318_suspend, icn8318_resume);
+
+static int icn8318_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct icn8318_data *data;
+	struct input_dev *input;
+	int error;
+
+	if (!client->irq) {
+		dev_err(dev, "Error no irq specified\n");
+		return -EINVAL;
+	}
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->wake_gpio = devm_gpiod_get(dev, "wake", GPIOD_OUT_LOW);
+	if (IS_ERR(data->wake_gpio))
+		return dev_err_probe(dev, PTR_ERR(data->wake_gpio), "Error getting wake gpio\n");
+
+	input = devm_input_allocate_device(dev);
+	if (!input)
+		return -ENOMEM;
+
+	input->name = client->name;
+	input->id.bustype = BUS_I2C;
+	input->open = icn8318_start;
+	input->close = icn8318_stop;
+	input->dev.parent = dev;
+
+	input_set_capability(input, EV_ABS, ABS_MT_POSITION_X);
+	input_set_capability(input, EV_ABS, ABS_MT_POSITION_Y);
+
+	touchscreen_parse_properties(input, true, &data->prop);
+	if (!input_abs_get_max(input, ABS_MT_POSITION_X) ||
+	    !input_abs_get_max(input, ABS_MT_POSITION_Y)) {
+		dev_err(dev, "Error touchscreen-size-x and/or -y missing\n");
+		return -EINVAL;
+	}
+
+	error = input_mt_init_slots(input, ICN8318_MAX_TOUCHES,
+				    INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
+	if (error)
+		return error;
+
+	data->client = client;
+	data->input = input;
+	input_set_drvdata(input, data);
+
+	error = devm_request_threaded_irq(dev, client->irq, NULL, icn8318_irq,
+					  IRQF_ONESHOT, client->name, data);
+	if (error) {
+		dev_err(dev, "Error requesting irq: %d\n", error);
+		return error;
+	}
+
+	/* Stop device till opened */
+	icn8318_stop(data->input);
+
+	error = input_register_device(input);
+	if (error)
+		return error;
+
+	i2c_set_clientdata(client, data);
+
+	return 0;
+}
+
+static const struct of_device_id icn8318_of_match[] = {
+	{ .compatible = "chipone,icn8318" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, icn8318_of_match);
+
+/* This is useless for OF-enabled devices, but it is needed by I2C subsystem */
+static const struct i2c_device_id icn8318_i2c_id[] = {
+	{ },
+};
+MODULE_DEVICE_TABLE(i2c, icn8318_i2c_id);
+
+static struct i2c_driver icn8318_driver = {
+	.driver = {
+		.name	= "chipone_icn8318",
+		.pm	= pm_sleep_ptr(&icn8318_pm_ops),
+		.of_match_table = icn8318_of_match,
+	},
+	.probe = icn8318_probe,
+	.id_table = icn8318_i2c_id,
+};
+
+module_i2c_driver(icn8318_driver);
+
+MODULE_DESCRIPTION("ChipOne icn8318 I2C Touchscreen Driver");
+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
+MODULE_LICENSE("GPL");