1 files changed, 490 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0364-Input-ili210x-fetch-touchscreen-geometry-from-DT.patch b/target/linux/brcm2708/patches-4.19/950-0364-Input-ili210x-fetch-touchscreen-geometry-from-DT.patch
new file mode 100644
index 0000000000..84c99ffa5a
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0364-Input-ili210x-fetch-touchscreen-geometry-from-DT.patch
@@ -0,0 +1,490 @@
+From 9c823e2ee1ec1b815b8ec29c231b112c5e397202 Mon Sep 17 00:00:00 2001
+From: Samuel Hsu <hsu@distec.de>
+Date: Mon, 8 Apr 2019 16:42:17 +0200
+Subject: [PATCH] Input: ili210x - fetch touchscreen geometry from DT
+
+commit f67cc3e927d8414ad3872e046764534ea1f5db0d upstream
+
+Fetching the geometry from the ILI251x registers seems unreliable and
+sometimes returns all zeroes. Add support for fetching the geometry and
+axis inversion from DT instead.
+
+Signed-off-by: Marek Vasut <marex@denx.de>
+Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
+---
+ drivers/input/touchscreen/ili210x.c | 321 +++++++++++++++++-----------
+ 1 file changed, 194 insertions(+), 127 deletions(-)
+
+--- a/drivers/input/touchscreen/ili210x.c
++++ b/drivers/input/touchscreen/ili210x.c
+@@ -4,11 +4,15 @@
+ #include <linux/slab.h>
+ #include <linux/input.h>
+ #include <linux/input/mt.h>
++#include <linux/input/touchscreen.h>
+ #include <linux/delay.h>
+ #include <linux/workqueue.h>
+-#include <linux/input/ili210x.h>
++#include <linux/gpio/consumer.h>
++#include <linux/of_device.h>
++#include <asm/unaligned.h>
+ 
+-#define MAX_TOUCHES		2
++#define ILI210X_TOUCHES		2
++#define ILI251X_TOUCHES		10
+ #define DEFAULT_POLL_PERIOD	20
+ 
+ /* Touchscreen commands */
+@@ -17,41 +21,32 @@
+ #define REG_FIRMWARE_VERSION	0x40
+ #define REG_CALIBRATE		0xcc
+ 
+-struct finger {
+-	u8 x_low;
+-	u8 x_high;
+-	u8 y_low;
+-	u8 y_high;
+-} __packed;
+-
+-struct touchdata {
+-	u8 status;
+-	struct finger finger[MAX_TOUCHES];
+-} __packed;
+-
+-struct panel_info {
+-	struct finger finger_max;
+-	u8 xchannel_num;
+-	u8 ychannel_num;
+-} __packed;
+-
+ struct firmware_version {
+ 	u8 id;
+ 	u8 major;
+ 	u8 minor;
+ } __packed;
+ 
++enum ili2xxx_model {
++	MODEL_ILI210X,
++	MODEL_ILI251X,
++};
++
+ struct ili210x {
+ 	struct i2c_client *client;
+ 	struct input_dev *input;
+-	bool (*get_pendown_state)(void);
+ 	unsigned int poll_period;
+ 	struct delayed_work dwork;
++	struct gpio_desc *reset_gpio;
++	struct touchscreen_properties prop;
++	enum ili2xxx_model model;
++	unsigned int max_touches;
+ };
+ 
+ static int ili210x_read_reg(struct i2c_client *client, u8 reg, void *buf,
+ 			    size_t len)
+ {
++	struct ili210x *priv = i2c_get_clientdata(client);
+ 	struct i2c_msg msg[2] = {
+ 		{
+ 			.addr	= client->addr,
+@@ -67,7 +62,38 @@ static int ili210x_read_reg(struct i2c_c
+ 		}
+ 	};
+ 
+-	if (i2c_transfer(client->adapter, msg, 2) != 2) {
++	if (priv->model == MODEL_ILI251X) {
++		if (i2c_transfer(client->adapter, msg, 1) != 1) {
++			dev_err(&client->dev, "i2c transfer failed\n");
++			return -EIO;
++		}
++
++		usleep_range(5000, 5500);
++
++		if (i2c_transfer(client->adapter, msg + 1, 1) != 1) {
++			dev_err(&client->dev, "i2c transfer failed\n");
++			return -EIO;
++		}
++	} else {
++		if (i2c_transfer(client->adapter, msg, 2) != 2) {
++			dev_err(&client->dev, "i2c transfer failed\n");
++			return -EIO;
++		}
++	}
++
++	return 0;
++}
++
++static int ili210x_read(struct i2c_client *client, void *buf, size_t len)
++{
++	struct i2c_msg msg = {
++		.addr	= client->addr,
++		.flags	= I2C_M_RD,
++		.len	= len,
++		.buf	= buf,
++	};
++
++	if (i2c_transfer(client->adapter, &msg, 1) != 1) {
+ 		dev_err(&client->dev, "i2c transfer failed\n");
+ 		return -EIO;
+ 	}
+@@ -75,42 +101,72 @@ static int ili210x_read_reg(struct i2c_c
+ 	return 0;
+ }
+ 
+-static void ili210x_report_events(struct input_dev *input,
+-				  const struct touchdata *touchdata)
++static bool ili210x_touchdata_to_coords(struct ili210x *priv, u8 *touchdata,
++					unsigned int finger,
++					unsigned int *x, unsigned int *y)
+ {
+-	int i;
+-	bool touch;
+-	unsigned int x, y;
+-	const struct finger *finger;
++	if (finger >= ILI210X_TOUCHES)
++		return false;
+ 
+-	for (i = 0; i < MAX_TOUCHES; i++) {
+-		input_mt_slot(input, i);
++	if (touchdata[0] & BIT(finger))
++		return false;
+ 
+-		finger = &touchdata->finger[i];
++	*x = get_unaligned_be16(touchdata + 1 + (finger * 4) + 0);
++	*y = get_unaligned_be16(touchdata + 1 + (finger * 4) + 2);
+ 
+-		touch = touchdata->status & (1 << i);
+-		input_mt_report_slot_state(input, MT_TOOL_FINGER, touch);
+-		if (touch) {
+-			x = finger->x_low | (finger->x_high << 8);
+-			y = finger->y_low | (finger->y_high << 8);
++	return true;
++}
++
++static bool ili251x_touchdata_to_coords(struct ili210x *priv, u8 *touchdata,
++					unsigned int finger,
++					unsigned int *x, unsigned int *y)
++{
++	if (finger >= ILI251X_TOUCHES)
++		return false;
++
++	*x = get_unaligned_be16(touchdata + 1 + (finger * 5) + 0);
++	if (!(*x & BIT(15)))	/* Touch indication */
++		return false;
++
++	*x &= 0x3fff;
++	*y = get_unaligned_be16(touchdata + 1 + (finger * 5) + 2);
++
++	return true;
++}
++
++static bool ili210x_report_events(struct ili210x *priv, u8 *touchdata)
++{
++	struct input_dev *input = priv->input;
++	int i;
++	bool contact = false, touch = false;
++	unsigned int x = 0, y = 0;
+ 
+-			input_report_abs(input, ABS_MT_POSITION_X, x);
+-			input_report_abs(input, ABS_MT_POSITION_Y, y);
++	for (i = 0; i < priv->max_touches; i++) {
++		if (priv->model == MODEL_ILI210X) {
++			touch = ili210x_touchdata_to_coords(priv, touchdata,
++							    i, &x, &y);
++		} else if (priv->model == MODEL_ILI251X) {
++			touch = ili251x_touchdata_to_coords(priv, touchdata,
++							    i, &x, &y);
++			if (touch)
++				contact = true;
+ 		}
++
++		input_mt_slot(input, i);
++		input_mt_report_slot_state(input, MT_TOOL_FINGER, touch);
++		if (!touch)
++			continue;
++		touchscreen_report_pos(input, &priv->prop, x, y,
++				       true);
+ 	}
+ 
+ 	input_mt_report_pointer_emulation(input, false);
+ 	input_sync(input);
+-}
+ 
+-static bool get_pendown_state(const struct ili210x *priv)
+-{
+-	bool state = false;
+-
+-	if (priv->get_pendown_state)
+-		state = priv->get_pendown_state();
++	if (priv->model == MODEL_ILI210X)
++		contact = touchdata[0] & 0xf3;
+ 
+-	return state;
++	return contact;
+ }
+ 
+ static void ili210x_work(struct work_struct *work)
+@@ -118,20 +174,29 @@ static void ili210x_work(struct work_str
+ 	struct ili210x *priv = container_of(work, struct ili210x,
+ 					    dwork.work);
+ 	struct i2c_client *client = priv->client;
+-	struct touchdata touchdata;
+-	int error;
++	u8 touchdata[64] = { 0 };
++	bool touch;
++	int error = -EINVAL;
++
++	if (priv->model == MODEL_ILI210X) {
++		error = ili210x_read_reg(client, REG_TOUCHDATA,
++					 touchdata, sizeof(touchdata));
++	} else if (priv->model == MODEL_ILI251X) {
++		error = ili210x_read_reg(client, REG_TOUCHDATA,
++					 touchdata, 31);
++		if (!error && touchdata[0] == 2)
++			error = ili210x_read(client, &touchdata[31], 20);
++	}
+ 
+-	error = ili210x_read_reg(client, REG_TOUCHDATA,
+-				 &touchdata, sizeof(touchdata));
+ 	if (error) {
+ 		dev_err(&client->dev,
+ 			"Unable to get touchdata, err = %d\n", error);
+ 		return;
+ 	}
+ 
+-	ili210x_report_events(priv->input, &touchdata);
++	touch = ili210x_report_events(priv, touchdata);
+ 
+-	if ((touchdata.status & 0xf3) || get_pendown_state(priv))
++	if (touch)
+ 		schedule_delayed_work(&priv->dwork,
+ 				      msecs_to_jiffies(priv->poll_period));
+ }
+@@ -180,30 +245,76 @@ static const struct attribute_group ili2
+ 	.attrs = ili210x_attributes,
+ };
+ 
++static void ili210x_power_down(void *data)
++{
++	struct gpio_desc *reset_gpio = data;
++
++	gpiod_set_value_cansleep(reset_gpio, 1);
++}
++
++static void ili210x_cancel_work(void *data)
++{
++	struct ili210x *priv = data;
++
++	cancel_delayed_work_sync(&priv->dwork);
++}
++
+ static int ili210x_i2c_probe(struct i2c_client *client,
+ 				       const struct i2c_device_id *id)
+ {
+ 	struct device *dev = &client->dev;
+-	const struct ili210x_platform_data *pdata = dev_get_platdata(dev);
+ 	struct ili210x *priv;
++	struct gpio_desc *reset_gpio;
+ 	struct input_dev *input;
+-	struct panel_info panel;
+ 	struct firmware_version firmware;
+-	int xmax, ymax;
++	enum ili2xxx_model model;
+ 	int error;
+ 
+-	dev_dbg(dev, "Probing for ILI210X I2C Touschreen driver");
++	model = (enum ili2xxx_model)id->driver_data;
+ 
+-	if (!pdata) {
+-		dev_err(dev, "No platform data!\n");
+-		return -EINVAL;
+-	}
++	dev_dbg(dev, "Probing for ILI210X I2C Touschreen driver");
+ 
+ 	if (client->irq <= 0) {
+ 		dev_err(dev, "No IRQ!\n");
+ 		return -EINVAL;
+ 	}
+ 
++	reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
++	if (IS_ERR(reset_gpio))
++		return PTR_ERR(reset_gpio);
++
++	if (reset_gpio) {
++		error = devm_add_action_or_reset(dev, ili210x_power_down,
++						 reset_gpio);
++		if (error)
++			return error;
++
++		usleep_range(50, 100);
++		gpiod_set_value_cansleep(reset_gpio, 0);
++		msleep(100);
++	}
++
++	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
++	if (!priv)
++		return -ENOMEM;
++
++	input = devm_input_allocate_device(dev);
++	if (!input)
++		return -ENOMEM;
++
++	priv->client = client;
++	priv->input = input;
++	priv->poll_period = DEFAULT_POLL_PERIOD;
++	INIT_DELAYED_WORK(&priv->dwork, ili210x_work);
++	priv->reset_gpio = reset_gpio;
++	priv->model = model;
++	if (model == MODEL_ILI210X)
++		priv->max_touches = ILI210X_TOUCHES;
++	if (model == MODEL_ILI251X)
++		priv->max_touches = ILI251X_TOUCHES;
++
++	i2c_set_clientdata(client, priv);
++
+ 	/* Get firmware version */
+ 	error = ili210x_read_reg(client, REG_FIRMWARE_VERSION,
+ 				 &firmware, sizeof(firmware));
+@@ -213,70 +324,40 @@ static int ili210x_i2c_probe(struct i2c_
+ 		return error;
+ 	}
+ 
+-	/* get panel info */
+-	error = ili210x_read_reg(client, REG_PANEL_INFO, &panel, sizeof(panel));
+-	if (error) {
+-		dev_err(dev, "Failed to get panel information, err: %d\n",
+-			error);
+-		return error;
+-	}
+-
+-	xmax = panel.finger_max.x_low | (panel.finger_max.x_high << 8);
+-	ymax = panel.finger_max.y_low | (panel.finger_max.y_high << 8);
+-
+-	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+-	input = input_allocate_device();
+-	if (!priv || !input) {
+-		error = -ENOMEM;
+-		goto err_free_mem;
+-	}
+-
+-	priv->client = client;
+-	priv->input = input;
+-	priv->get_pendown_state = pdata->get_pendown_state;
+-	priv->poll_period = pdata->poll_period ? : DEFAULT_POLL_PERIOD;
+-	INIT_DELAYED_WORK(&priv->dwork, ili210x_work);
+-
+ 	/* Setup input device */
+ 	input->name = "ILI210x Touchscreen";
+ 	input->id.bustype = BUS_I2C;
+ 	input->dev.parent = dev;
+ 
+-	__set_bit(EV_SYN, input->evbit);
+-	__set_bit(EV_KEY, input->evbit);
+-	__set_bit(EV_ABS, input->evbit);
+-	__set_bit(BTN_TOUCH, input->keybit);
+-
+-	/* Single touch */
+-	input_set_abs_params(input, ABS_X, 0, xmax, 0, 0);
+-	input_set_abs_params(input, ABS_Y, 0, ymax, 0, 0);
+-
+ 	/* Multi touch */
+-	input_mt_init_slots(input, MAX_TOUCHES, 0);
+-	input_set_abs_params(input, ABS_MT_POSITION_X, 0, xmax, 0, 0);
+-	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, ymax, 0, 0);
++	input_set_abs_params(input, ABS_MT_POSITION_X, 0, 0xffff, 0, 0);
++	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, 0xffff, 0, 0);
++	touchscreen_parse_properties(input, true, &priv->prop);
++	input_mt_init_slots(input, priv->max_touches, INPUT_MT_DIRECT);
+ 
+-	i2c_set_clientdata(client, priv);
++	error = devm_add_action(dev, ili210x_cancel_work, priv);
++	if (error)
++		return error;
+ 
+-	error = request_irq(client->irq, ili210x_irq, pdata->irq_flags,
+-			    client->name, priv);
++	error = devm_request_irq(dev, client->irq, ili210x_irq, 0,
++				 client->name, priv);
+ 	if (error) {
+ 		dev_err(dev, "Unable to request touchscreen IRQ, err: %d\n",
+ 			error);
+-		goto err_free_mem;
++		return error;
+ 	}
+ 
+-	error = sysfs_create_group(&dev->kobj, &ili210x_attr_group);
++	error = devm_device_add_group(dev, &ili210x_attr_group);
+ 	if (error) {
+ 		dev_err(dev, "Unable to create sysfs attributes, err: %d\n",
+ 			error);
+-		goto err_free_irq;
++		return error;
+ 	}
+ 
+ 	error = input_register_device(priv->input);
+ 	if (error) {
+ 		dev_err(dev, "Cannot register input device, err: %d\n", error);
+-		goto err_remove_sysfs;
++		return error;
+ 	}
+ 
+ 	device_init_wakeup(dev, 1);
+@@ -286,28 +367,6 @@ static int ili210x_i2c_probe(struct i2c_
+ 		client->irq, firmware.id, firmware.major, firmware.minor);
+ 
+ 	return 0;
+-
+-err_remove_sysfs:
+-	sysfs_remove_group(&dev->kobj, &ili210x_attr_group);
+-err_free_irq:
+-	free_irq(client->irq, priv);
+-err_free_mem:
+-	input_free_device(input);
+-	kfree(priv);
+-	return error;
+-}
+-
+-static int ili210x_i2c_remove(struct i2c_client *client)
+-{
+-	struct ili210x *priv = i2c_get_clientdata(client);
+-
+-	sysfs_remove_group(&client->dev.kobj, &ili210x_attr_group);
+-	free_irq(priv->client->irq, priv);
+-	cancel_delayed_work_sync(&priv->dwork);
+-	input_unregister_device(priv->input);
+-	kfree(priv);
+-
+-	return 0;
+ }
+ 
+ static int __maybe_unused ili210x_i2c_suspend(struct device *dev)
+@@ -334,19 +393,27 @@ static SIMPLE_DEV_PM_OPS(ili210x_i2c_pm,
+ 			 ili210x_i2c_suspend, ili210x_i2c_resume);
+ 
+ static const struct i2c_device_id ili210x_i2c_id[] = {
+-	{ "ili210x", 0 },
++	{ "ili210x", MODEL_ILI210X },
++	{ "ili251x", MODEL_ILI251X },
+ 	{ }
+ };
+ MODULE_DEVICE_TABLE(i2c, ili210x_i2c_id);
+ 
++static const struct of_device_id ili210x_dt_ids[] = {
++	{ .compatible = "ilitek,ili210x", .data = (void *)MODEL_ILI210X },
++	{ .compatible = "ilitek,ili251x", .data = (void *)MODEL_ILI251X },
++	{ },
++};
++MODULE_DEVICE_TABLE(of, ili210x_dt_ids);
++
+ static struct i2c_driver ili210x_ts_driver = {
+ 	.driver = {
+ 		.name = "ili210x_i2c",
+ 		.pm = &ili210x_i2c_pm,
++		.of_match_table = ili210x_dt_ids,
+ 	},
+ 	.id_table = ili210x_i2c_id,
+ 	.probe = ili210x_i2c_probe,
+-	.remove = ili210x_i2c_remove,
+ };
+ 
+ module_i2c_driver(ili210x_ts_driver);