Adding upstream version 4.19.249.upstream/4.19.249

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

1 files changed, 249 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/migor_ts.c b/drivers/input/touchscreen/migor_ts.c
new file mode 100644
index 000000000..02fb11985
--- /dev/null
+++ b/drivers/input/touchscreen/migor_ts.c
@@ -0,0 +1,249 @@
+/*
+ * Touch Screen driver for Renesas MIGO-R Platform
+ *
+ * Copyright (c) 2008 Magnus Damm
+ * Copyright (c) 2007 Ujjwal Pande <ujjwal@kenati.com>,
+ *  Kenati Technologies Pvt Ltd.
+ *
+ * This file is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU  General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This file is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/pm.h>
+#include <linux/slab.h>
+#include <asm/io.h>
+#include <linux/i2c.h>
+#include <linux/timer.h>
+
+#define EVENT_PENDOWN 1
+#define EVENT_REPEAT  2
+#define EVENT_PENUP   3
+
+struct migor_ts_priv {
+	struct i2c_client *client;
+	struct input_dev *input;
+	int irq;
+};
+
+static const u_int8_t migor_ts_ena_seq[17] = { 0x33, 0x22, 0x11,
+					       0x01, 0x06, 0x07, };
+static const u_int8_t migor_ts_dis_seq[17] = { };
+
+static irqreturn_t migor_ts_isr(int irq, void *dev_id)
+{
+	struct migor_ts_priv *priv = dev_id;
+	unsigned short xpos, ypos;
+	unsigned char event;
+	u_int8_t buf[16];
+
+	/*
+	 * The touch screen controller chip is hooked up to the CPU
+	 * using I2C and a single interrupt line. The interrupt line
+	 * is pulled low whenever someone taps the screen. To deassert
+	 * the interrupt line we need to acknowledge the interrupt by
+	 * communicating with the controller over the slow i2c bus.
+	 *
+	 * Since I2C bus controller may sleep we are using threaded
+	 * IRQ here.
+	 */
+
+	memset(buf, 0, sizeof(buf));
+
+	/* Set Index 0 */
+	buf[0] = 0;
+	if (i2c_master_send(priv->client, buf, 1) != 1) {
+		dev_err(&priv->client->dev, "Unable to write i2c index\n");
+		goto out;
+	}
+
+	/* Now do Page Read */
+	if (i2c_master_recv(priv->client, buf, sizeof(buf)) != sizeof(buf)) {
+		dev_err(&priv->client->dev, "Unable to read i2c page\n");
+		goto out;
+	}
+
+	ypos = ((buf[9] & 0x03) << 8 | buf[8]);
+	xpos = ((buf[11] & 0x03) << 8 | buf[10]);
+	event = buf[12];
+
+	switch (event) {
+	case EVENT_PENDOWN:
+	case EVENT_REPEAT:
+		input_report_key(priv->input, BTN_TOUCH, 1);
+		input_report_abs(priv->input, ABS_X, ypos); /*X-Y swap*/
+		input_report_abs(priv->input, ABS_Y, xpos);
+		input_sync(priv->input);
+		break;
+
+	case EVENT_PENUP:
+		input_report_key(priv->input, BTN_TOUCH, 0);
+		input_sync(priv->input);
+		break;
+	}
+
+ out:
+	return IRQ_HANDLED;
+}
+
+static int migor_ts_open(struct input_dev *dev)
+{
+	struct migor_ts_priv *priv = input_get_drvdata(dev);
+	struct i2c_client *client = priv->client;
+	int count;
+
+	/* enable controller */
+	count = i2c_master_send(client, migor_ts_ena_seq,
+				sizeof(migor_ts_ena_seq));
+	if (count != sizeof(migor_ts_ena_seq)) {
+		dev_err(&client->dev, "Unable to enable touchscreen.\n");
+		return -ENXIO;
+	}
+
+	return 0;
+}
+
+static void migor_ts_close(struct input_dev *dev)
+{
+	struct migor_ts_priv *priv = input_get_drvdata(dev);
+	struct i2c_client *client = priv->client;
+
+	disable_irq(priv->irq);
+
+	/* disable controller */
+	i2c_master_send(client, migor_ts_dis_seq, sizeof(migor_ts_dis_seq));
+
+	enable_irq(priv->irq);
+}
+
+static int migor_ts_probe(struct i2c_client *client,
+			  const struct i2c_device_id *idp)
+{
+	struct migor_ts_priv *priv;
+	struct input_dev *input;
+	int error;
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	input = input_allocate_device();
+	if (!priv || !input) {
+		dev_err(&client->dev, "failed to allocate memory\n");
+		error = -ENOMEM;
+		goto err_free_mem;
+	}
+
+	priv->client = client;
+	priv->input = input;
+	priv->irq = client->irq;
+
+	input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+
+	__set_bit(BTN_TOUCH, input->keybit);
+
+	input_set_abs_params(input, ABS_X, 95, 955, 0, 0);
+	input_set_abs_params(input, ABS_Y, 85, 935, 0, 0);
+
+	input->name = client->name;
+	input->id.bustype = BUS_I2C;
+	input->dev.parent = &client->dev;
+
+	input->open = migor_ts_open;
+	input->close = migor_ts_close;
+
+	input_set_drvdata(input, priv);
+
+	error = request_threaded_irq(priv->irq, NULL, migor_ts_isr,
+                                     IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+                                     client->name, priv);
+	if (error) {
+		dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
+		goto err_free_mem;
+	}
+
+	error = input_register_device(input);
+	if (error)
+		goto err_free_irq;
+
+	i2c_set_clientdata(client, priv);
+	device_init_wakeup(&client->dev, 1);
+
+	return 0;
+
+ err_free_irq:
+	free_irq(priv->irq, priv);
+ err_free_mem:
+	input_free_device(input);
+	kfree(priv);
+	return error;
+}
+
+static int migor_ts_remove(struct i2c_client *client)
+{
+	struct migor_ts_priv *priv = i2c_get_clientdata(client);
+
+	free_irq(priv->irq, priv);
+	input_unregister_device(priv->input);
+	kfree(priv);
+
+	dev_set_drvdata(&client->dev, NULL);
+
+	return 0;
+}
+
+static int __maybe_unused migor_ts_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct migor_ts_priv *priv = i2c_get_clientdata(client);
+
+	if (device_may_wakeup(&client->dev))
+		enable_irq_wake(priv->irq);
+
+	return 0;
+}
+
+static int __maybe_unused migor_ts_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct migor_ts_priv *priv = i2c_get_clientdata(client);
+
+	if (device_may_wakeup(&client->dev))
+		disable_irq_wake(priv->irq);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(migor_ts_pm, migor_ts_suspend, migor_ts_resume);
+
+static const struct i2c_device_id migor_ts_id[] = {
+	{ "migor_ts", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, migor_ts_id);
+
+static struct i2c_driver migor_ts_driver = {
+	.driver = {
+		.name = "migor_ts",
+		.pm = &migor_ts_pm,
+	},
+	.probe = migor_ts_probe,
+	.remove = migor_ts_remove,
+	.id_table = migor_ts_id,
+};
+
+module_i2c_driver(migor_ts_driver);
+
+MODULE_DESCRIPTION("MigoR Touchscreen driver");
+MODULE_AUTHOR("Magnus Damm <damm@opensource.se>");
+MODULE_LICENSE("GPL");