// SPDX-License-Identifier: GPL-2.0+/* * 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. */#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){	struct migor_ts_priv *priv;	struct input_dev *input;	int error; 	priv = kzalloc_obj(*priv);	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 void 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);} static int 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 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 DEFINE_SIMPLE_DEV_PM_OPS(migor_ts_pm, migor_ts_suspend, migor_ts_resume); static const struct i2c_device_id migor_ts_id[] = {	{ .name = "migor_ts" },	{ }};MODULE_DEVICE_TABLE(i2c, migor_ts_id); static struct i2c_driver migor_ts_driver = {	.driver = {		.name = "migor_ts",		.pm = pm_sleep_ptr(&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");