Adding upstream version 5.10.209.upstream/5.10.209upstream

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

1 files changed, 520 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/ili210x.c b/drivers/input/touchscreen/ili210x.c
new file mode 100644
index 000000000..f437eefec
--- /dev/null
+++ b/drivers/input/touchscreen/ili210x.c
@@ -0,0 +1,520 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+#include <asm/unaligned.h>
+
+#define ILI2XXX_POLL_PERIOD	20
+
+#define ILI210X_DATA_SIZE	64
+#define ILI211X_DATA_SIZE	43
+#define ILI251X_DATA_SIZE1	31
+#define ILI251X_DATA_SIZE2	20
+
+/* Touchscreen commands */
+#define REG_TOUCHDATA		0x10
+#define REG_PANEL_INFO		0x20
+#define REG_CALIBRATE		0xcc
+
+struct ili2xxx_chip {
+	int (*read_reg)(struct i2c_client *client, u8 reg,
+			void *buf, size_t len);
+	int (*get_touch_data)(struct i2c_client *client, u8 *data);
+	bool (*parse_touch_data)(const u8 *data, unsigned int finger,
+				 unsigned int *x, unsigned int *y,
+				 unsigned int *z);
+	bool (*continue_polling)(const u8 *data, bool touch);
+	unsigned int max_touches;
+	unsigned int resolution;
+	bool has_calibrate_reg;
+	bool has_pressure_reg;
+};
+
+struct ili210x {
+	struct i2c_client *client;
+	struct input_dev *input;
+	struct gpio_desc *reset_gpio;
+	struct touchscreen_properties prop;
+	const struct ili2xxx_chip *chip;
+	bool stop;
+};
+
+static int ili210x_read_reg(struct i2c_client *client,
+			    u8 reg, void *buf, size_t len)
+{
+	struct i2c_msg msg[] = {
+		{
+			.addr	= client->addr,
+			.flags	= 0,
+			.len	= 1,
+			.buf	= &reg,
+		},
+		{
+			.addr	= client->addr,
+			.flags	= I2C_M_RD,
+			.len	= len,
+			.buf	= buf,
+		}
+	};
+	int error, ret;
+
+	ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
+	if (ret != ARRAY_SIZE(msg)) {
+		error = ret < 0 ? ret : -EIO;
+		dev_err(&client->dev, "%s failed: %d\n", __func__, error);
+		return error;
+	}
+
+	return 0;
+}
+
+static int ili210x_read_touch_data(struct i2c_client *client, u8 *data)
+{
+	return ili210x_read_reg(client, REG_TOUCHDATA,
+				data, ILI210X_DATA_SIZE);
+}
+
+static bool ili210x_touchdata_to_coords(const u8 *touchdata,
+					unsigned int finger,
+					unsigned int *x, unsigned int *y,
+					unsigned int *z)
+{
+	if (!(touchdata[0] & BIT(finger)))
+		return false;
+
+	*x = get_unaligned_be16(touchdata + 1 + (finger * 4) + 0);
+	*y = get_unaligned_be16(touchdata + 1 + (finger * 4) + 2);
+
+	return true;
+}
+
+static bool ili210x_check_continue_polling(const u8 *data, bool touch)
+{
+	return data[0] & 0xf3;
+}
+
+static const struct ili2xxx_chip ili210x_chip = {
+	.read_reg		= ili210x_read_reg,
+	.get_touch_data		= ili210x_read_touch_data,
+	.parse_touch_data	= ili210x_touchdata_to_coords,
+	.continue_polling	= ili210x_check_continue_polling,
+	.max_touches		= 2,
+	.has_calibrate_reg	= true,
+};
+
+static int ili211x_read_touch_data(struct i2c_client *client, u8 *data)
+{
+	s16 sum = 0;
+	int error;
+	int ret;
+	int i;
+
+	ret = i2c_master_recv(client, data, ILI211X_DATA_SIZE);
+	if (ret != ILI211X_DATA_SIZE) {
+		error = ret < 0 ? ret : -EIO;
+		dev_err(&client->dev, "%s failed: %d\n", __func__, error);
+		return error;
+	}
+
+	/* This chip uses custom checksum at the end of data */
+	for (i = 0; i < ILI211X_DATA_SIZE - 1; i++)
+		sum = (sum + data[i]) & 0xff;
+
+	if ((-sum & 0xff) != data[ILI211X_DATA_SIZE - 1]) {
+		dev_err(&client->dev,
+			"CRC error (crc=0x%02x expected=0x%02x)\n",
+			sum, data[ILI211X_DATA_SIZE - 1]);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static bool ili211x_touchdata_to_coords(const u8 *touchdata,
+					unsigned int finger,
+					unsigned int *x, unsigned int *y,
+					unsigned int *z)
+{
+	u32 data;
+
+	data = get_unaligned_be32(touchdata + 1 + (finger * 4) + 0);
+	if (data == 0xffffffff)	/* Finger up */
+		return false;
+
+	*x = ((touchdata[1 + (finger * 4) + 0] & 0xf0) << 4) |
+	     touchdata[1 + (finger * 4) + 1];
+	*y = ((touchdata[1 + (finger * 4) + 0] & 0x0f) << 8) |
+	     touchdata[1 + (finger * 4) + 2];
+
+	return true;
+}
+
+static bool ili211x_decline_polling(const u8 *data, bool touch)
+{
+	return false;
+}
+
+static const struct ili2xxx_chip ili211x_chip = {
+	.read_reg		= ili210x_read_reg,
+	.get_touch_data		= ili211x_read_touch_data,
+	.parse_touch_data	= ili211x_touchdata_to_coords,
+	.continue_polling	= ili211x_decline_polling,
+	.max_touches		= 10,
+	.resolution		= 2048,
+};
+
+static bool ili212x_touchdata_to_coords(const u8 *touchdata,
+					unsigned int finger,
+					unsigned int *x, unsigned int *y,
+					unsigned int *z)
+{
+	u16 val;
+
+	val = get_unaligned_be16(touchdata + 3 + (finger * 5) + 0);
+	if (!(val & BIT(15)))	/* Touch indication */
+		return false;
+
+	*x = val & 0x3fff;
+	*y = get_unaligned_be16(touchdata + 3 + (finger * 5) + 2);
+
+	return true;
+}
+
+static bool ili212x_check_continue_polling(const u8 *data, bool touch)
+{
+	return touch;
+}
+
+static const struct ili2xxx_chip ili212x_chip = {
+	.read_reg		= ili210x_read_reg,
+	.get_touch_data		= ili210x_read_touch_data,
+	.parse_touch_data	= ili212x_touchdata_to_coords,
+	.continue_polling	= ili212x_check_continue_polling,
+	.max_touches		= 10,
+	.has_calibrate_reg	= true,
+};
+
+static int ili251x_read_reg(struct i2c_client *client,
+			    u8 reg, void *buf, size_t len)
+{
+	int error;
+	int ret;
+
+	ret = i2c_master_send(client, &reg, 1);
+	if (ret == 1) {
+		usleep_range(5000, 5500);
+
+		ret = i2c_master_recv(client, buf, len);
+		if (ret == len)
+			return 0;
+	}
+
+	error = ret < 0 ? ret : -EIO;
+	dev_err(&client->dev, "%s failed: %d\n", __func__, error);
+	return ret;
+}
+
+static int ili251x_read_touch_data(struct i2c_client *client, u8 *data)
+{
+	int error;
+
+	error = ili251x_read_reg(client, REG_TOUCHDATA,
+				 data, ILI251X_DATA_SIZE1);
+	if (!error && data[0] == 2) {
+		error = i2c_master_recv(client, data + ILI251X_DATA_SIZE1,
+					ILI251X_DATA_SIZE2);
+		if (error >= 0 && error != ILI251X_DATA_SIZE2)
+			error = -EIO;
+	}
+
+	return error;
+}
+
+static bool ili251x_touchdata_to_coords(const u8 *touchdata,
+					unsigned int finger,
+					unsigned int *x, unsigned int *y,
+					unsigned int *z)
+{
+	u16 val;
+
+	val = get_unaligned_be16(touchdata + 1 + (finger * 5) + 0);
+	if (!(val & BIT(15)))	/* Touch indication */
+		return false;
+
+	*x = val & 0x3fff;
+	*y = get_unaligned_be16(touchdata + 1 + (finger * 5) + 2);
+	*z = touchdata[1 + (finger * 5) + 4];
+
+	return true;
+}
+
+static bool ili251x_check_continue_polling(const u8 *data, bool touch)
+{
+	return touch;
+}
+
+static const struct ili2xxx_chip ili251x_chip = {
+	.read_reg		= ili251x_read_reg,
+	.get_touch_data		= ili251x_read_touch_data,
+	.parse_touch_data	= ili251x_touchdata_to_coords,
+	.continue_polling	= ili251x_check_continue_polling,
+	.max_touches		= 10,
+	.has_calibrate_reg	= true,
+	.has_pressure_reg	= true,
+};
+
+static bool ili210x_report_events(struct ili210x *priv, u8 *touchdata)
+{
+	struct input_dev *input = priv->input;
+	int i;
+	bool contact = false, touch;
+	unsigned int x = 0, y = 0, z = 0;
+
+	for (i = 0; i < priv->chip->max_touches; i++) {
+		touch = priv->chip->parse_touch_data(touchdata, i, &x, &y, &z);
+
+		input_mt_slot(input, i);
+		if (input_mt_report_slot_state(input, MT_TOOL_FINGER, touch)) {
+			touchscreen_report_pos(input, &priv->prop, x, y, true);
+			if (priv->chip->has_pressure_reg)
+				input_report_abs(input, ABS_MT_PRESSURE, z);
+			contact = true;
+		}
+	}
+
+	input_mt_report_pointer_emulation(input, false);
+	input_sync(input);
+
+	return contact;
+}
+
+static irqreturn_t ili210x_irq(int irq, void *irq_data)
+{
+	struct ili210x *priv = irq_data;
+	struct i2c_client *client = priv->client;
+	const struct ili2xxx_chip *chip = priv->chip;
+	u8 touchdata[ILI210X_DATA_SIZE] = { 0 };
+	bool keep_polling;
+	bool touch;
+	int error;
+
+	do {
+		error = chip->get_touch_data(client, touchdata);
+		if (error) {
+			dev_err(&client->dev,
+				"Unable to get touch data: %d\n", error);
+			break;
+		}
+
+		touch = ili210x_report_events(priv, touchdata);
+		keep_polling = chip->continue_polling(touchdata, touch);
+		if (keep_polling)
+			msleep(ILI2XXX_POLL_PERIOD);
+	} while (!priv->stop && keep_polling);
+
+	return IRQ_HANDLED;
+}
+
+static ssize_t ili210x_calibrate(struct device *dev,
+				 struct device_attribute *attr,
+				 const char *buf, size_t count)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct ili210x *priv = i2c_get_clientdata(client);
+	unsigned long calibrate;
+	int rc;
+	u8 cmd = REG_CALIBRATE;
+
+	if (kstrtoul(buf, 10, &calibrate))
+		return -EINVAL;
+
+	if (calibrate > 1)
+		return -EINVAL;
+
+	if (calibrate) {
+		rc = i2c_master_send(priv->client, &cmd, sizeof(cmd));
+		if (rc != sizeof(cmd))
+			return -EIO;
+	}
+
+	return count;
+}
+static DEVICE_ATTR(calibrate, S_IWUSR, NULL, ili210x_calibrate);
+
+static struct attribute *ili210x_attributes[] = {
+	&dev_attr_calibrate.attr,
+	NULL,
+};
+
+static umode_t ili210x_calibrate_visible(struct kobject *kobj,
+					  struct attribute *attr, int index)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct i2c_client *client = to_i2c_client(dev);
+	struct ili210x *priv = i2c_get_clientdata(client);
+
+	return priv->chip->has_calibrate_reg ? attr->mode : 0;
+}
+
+static const struct attribute_group ili210x_attr_group = {
+	.attrs = ili210x_attributes,
+	.is_visible = ili210x_calibrate_visible,
+};
+
+static void ili210x_power_down(void *data)
+{
+	struct gpio_desc *reset_gpio = data;
+
+	gpiod_set_value_cansleep(reset_gpio, 1);
+}
+
+static void ili210x_stop(void *data)
+{
+	struct ili210x *priv = data;
+
+	/* Tell ISR to quit even if there is a contact. */
+	priv->stop = true;
+}
+
+static int ili210x_i2c_probe(struct i2c_client *client,
+			     const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	const struct ili2xxx_chip *chip;
+	struct ili210x *priv;
+	struct gpio_desc *reset_gpio;
+	struct input_dev *input;
+	int error;
+	unsigned int max_xy;
+
+	dev_dbg(dev, "Probing for ILI210X I2C Touschreen driver");
+
+	chip = device_get_match_data(dev);
+	if (!chip && id)
+		chip = (const struct ili2xxx_chip *)id->driver_data;
+	if (!chip) {
+		dev_err(&client->dev, "unknown device model\n");
+		return -ENODEV;
+	}
+
+	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(12000, 15000);
+		gpiod_set_value_cansleep(reset_gpio, 0);
+		msleep(160);
+	}
+
+	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->reset_gpio = reset_gpio;
+	priv->chip = chip;
+	i2c_set_clientdata(client, priv);
+
+	/* Setup input device */
+	input->name = "ILI210x Touchscreen";
+	input->id.bustype = BUS_I2C;
+
+	/* Multi touch */
+	max_xy = (chip->resolution ?: SZ_64K) - 1;
+	input_set_abs_params(input, ABS_MT_POSITION_X, 0, max_xy, 0, 0);
+	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, max_xy, 0, 0);
+	if (priv->chip->has_pressure_reg)
+		input_set_abs_params(input, ABS_MT_PRESSURE, 0, 0xa, 0, 0);
+	touchscreen_parse_properties(input, true, &priv->prop);
+
+	error = input_mt_init_slots(input, priv->chip->max_touches,
+				    INPUT_MT_DIRECT);
+	if (error) {
+		dev_err(dev, "Unable to set up slots, err: %d\n", error);
+		return error;
+	}
+
+	error = devm_request_threaded_irq(dev, client->irq, NULL, ili210x_irq,
+					  IRQF_ONESHOT, client->name, priv);
+	if (error) {
+		dev_err(dev, "Unable to request touchscreen IRQ, err: %d\n",
+			error);
+		return error;
+	}
+
+	error = devm_add_action_or_reset(dev, ili210x_stop, priv);
+	if (error)
+		return error;
+
+	error = devm_device_add_group(dev, &ili210x_attr_group);
+	if (error) {
+		dev_err(dev, "Unable to create sysfs attributes, err: %d\n",
+			error);
+		return error;
+	}
+
+	error = input_register_device(priv->input);
+	if (error) {
+		dev_err(dev, "Cannot register input device, err: %d\n", error);
+		return error;
+	}
+
+	return 0;
+}
+
+static const struct i2c_device_id ili210x_i2c_id[] = {
+	{ "ili210x", (long)&ili210x_chip },
+	{ "ili2117", (long)&ili211x_chip },
+	{ "ili2120", (long)&ili212x_chip },
+	{ "ili251x", (long)&ili251x_chip },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, ili210x_i2c_id);
+
+static const struct of_device_id ili210x_dt_ids[] = {
+	{ .compatible = "ilitek,ili210x", .data = &ili210x_chip },
+	{ .compatible = "ilitek,ili2117", .data = &ili211x_chip },
+	{ .compatible = "ilitek,ili2120", .data = &ili212x_chip },
+	{ .compatible = "ilitek,ili251x", .data = &ili251x_chip },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ili210x_dt_ids);
+
+static struct i2c_driver ili210x_ts_driver = {
+	.driver = {
+		.name = "ili210x_i2c",
+		.of_match_table = ili210x_dt_ids,
+	},
+	.id_table = ili210x_i2c_id,
+	.probe = ili210x_i2c_probe,
+};
+
+module_i2c_driver(ili210x_ts_driver);
+
+MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
+MODULE_DESCRIPTION("ILI210X I2C Touchscreen Driver");
+MODULE_LICENSE("GPL");