// SPDX-License-Identifier: GPL-2.0-only/* * * h3600 atmel micro companion support, touchscreen subdevice * Author : Alessandro Gardich <gremlin@gremlin.it> * Author : Dmitry Artamonow <mad_soft@inbox.ru> * Author : Linus Walleij <linus.walleij@linaro.org> */ #include <asm/byteorder.h>#include <linux/module.h>#include <linux/init.h>#include <linux/interrupt.h>#include <linux/pm.h>#include <linux/delay.h>#include <linux/device.h>#include <linux/input.h>#include <linux/platform_device.h>#include <linux/slab.h>#include <linux/mfd/ipaq-micro.h> struct touchscreen_data {	struct input_dev *input;	struct ipaq_micro *micro;}; static void micro_ts_receive(void *data, int len, unsigned char *msg){	struct touchscreen_data *ts = data; 	if (len == 4) {		input_report_abs(ts->input, ABS_X,				 be16_to_cpup((__be16 *) &msg[2]));		input_report_abs(ts->input, ABS_Y,				 be16_to_cpup((__be16 *) &msg[0]));		input_report_key(ts->input, BTN_TOUCH, 1);		input_sync(ts->input);	} else if (len == 0) {		input_report_abs(ts->input, ABS_X, 0);		input_report_abs(ts->input, ABS_Y, 0);		input_report_key(ts->input, BTN_TOUCH, 0);		input_sync(ts->input);	}} static void micro_ts_toggle_receive(struct touchscreen_data *ts, bool enable){	struct ipaq_micro *micro = ts->micro; 	guard(spinlock_irq)(&micro->lock); 	if (enable) {		micro->ts = micro_ts_receive;		micro->ts_data = ts;	} else {		micro->ts = NULL;		micro->ts_data = NULL;	}} static int micro_ts_open(struct input_dev *input){	struct touchscreen_data *ts = input_get_drvdata(input); 	micro_ts_toggle_receive(ts, true); 	return 0;} static void micro_ts_close(struct input_dev *input){	struct touchscreen_data *ts = input_get_drvdata(input); 	micro_ts_toggle_receive(ts, false);} static int micro_ts_probe(struct platform_device *pdev){	struct ipaq_micro *micro = dev_get_drvdata(pdev->dev.parent);	struct touchscreen_data *ts;	int error; 	ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL);	if (!ts)		return -ENOMEM; 	ts->micro = micro; 	ts->input = devm_input_allocate_device(&pdev->dev);	if (!ts->input) {		dev_err(&pdev->dev, "failed to allocate input device\n");		return -ENOMEM;	} 	ts->input->name = "ipaq micro ts";	ts->input->open = micro_ts_open;	ts->input->close = micro_ts_close; 	input_set_drvdata(ts->input, ts); 	input_set_capability(ts->input, EV_KEY, BTN_TOUCH);	input_set_capability(ts->input, EV_ABS, ABS_X);	input_set_capability(ts->input, EV_ABS, ABS_Y);	input_set_abs_params(ts->input, ABS_X, 0, 1023, 0, 0);	input_set_abs_params(ts->input, ABS_Y, 0, 1023, 0, 0); 	error = input_register_device(ts->input);	if (error) {		dev_err(&pdev->dev, "error registering touch input\n");		return error;	} 	platform_set_drvdata(pdev, ts); 	dev_info(&pdev->dev, "iPAQ micro touchscreen\n"); 	return 0;} static int micro_ts_suspend(struct device *dev){	struct touchscreen_data *ts = dev_get_drvdata(dev); 	micro_ts_toggle_receive(ts, false); 	return 0;} static int micro_ts_resume(struct device *dev){	struct touchscreen_data *ts = dev_get_drvdata(dev);	struct input_dev *input = ts->input; 	guard(mutex)(&input->mutex); 	if (input_device_enabled(input))		micro_ts_toggle_receive(ts, true); 	return 0;} static DEFINE_SIMPLE_DEV_PM_OPS(micro_ts_dev_pm_ops,				micro_ts_suspend, micro_ts_resume); static struct platform_driver micro_ts_device_driver = {	.driver	= {		.name	= "ipaq-micro-ts",		.pm	= pm_sleep_ptr(&micro_ts_dev_pm_ops),	},	.probe	= micro_ts_probe,};module_platform_driver(micro_ts_device_driver); MODULE_LICENSE("GPL");MODULE_DESCRIPTION("driver for iPAQ Atmel micro touchscreen");MODULE_ALIAS("platform:ipaq-micro-ts");