1/*
  2 * This program is free software; you can redistribute it and/or modify
  3 * it under the terms of the GNU General Public License version 2 as
  4 * published by the Free Software Foundation.
  5 *
  6 * h3600 atmel micro companion support, touchscreen subdevice
  7 * Author : Alessandro Gardich <gremlin@gremlin.it>
  8 * Author : Dmitry Artamonow <mad_soft@inbox.ru>
  9 * Author : Linus Walleij <linus.walleij@linaro.org>
 10 *
 11 */
 12
 13#include <asm/byteorder.h>
 14#include <linux/module.h>
 15#include <linux/init.h>
 16#include <linux/interrupt.h>
 17#include <linux/pm.h>
 18#include <linux/delay.h>
 19#include <linux/device.h>
 20#include <linux/input.h>
 21#include <linux/platform_device.h>
 22#include <linux/slab.h>
 23#include <linux/mfd/ipaq-micro.h>
 24
 25struct touchscreen_data {
 26	struct input_dev *input;
 27	struct ipaq_micro *micro;
 28};
 29
 30static void micro_ts_receive(void *data, int len, unsigned char *msg)
 31{
 32	struct touchscreen_data *ts = data;
 33
 34	if (len == 4) {
 35		input_report_abs(ts->input, ABS_X,
 36				 be16_to_cpup((__be16 *) &msg[2]));
 37		input_report_abs(ts->input, ABS_Y,
 38				 be16_to_cpup((__be16 *) &msg[0]));
 39		input_report_key(ts->input, BTN_TOUCH, 1);
 40		input_sync(ts->input);
 41	} else if (len == 0) {
 42		input_report_abs(ts->input, ABS_X, 0);
 43		input_report_abs(ts->input, ABS_Y, 0);
 44		input_report_key(ts->input, BTN_TOUCH, 0);
 45		input_sync(ts->input);
 46	}
 47}
 48
 49static void micro_ts_toggle_receive(struct touchscreen_data *ts, bool enable)
 50{
 51	struct ipaq_micro *micro = ts->micro;
 52
 53	spin_lock_irq(&micro->lock);
 54
 55	if (enable) {
 56		micro->ts = micro_ts_receive;
 57		micro->ts_data = ts;
 58	} else {
 59		micro->ts = NULL;
 60		micro->ts_data = NULL;
 61	}
 62
 63	spin_unlock_irq(&ts->micro->lock);
 64}
 65
 66static int micro_ts_open(struct input_dev *input)
 67{
 68	struct touchscreen_data *ts = input_get_drvdata(input);
 69
 70	micro_ts_toggle_receive(ts, true);
 71
 72	return 0;
 73}
 74
 75static void micro_ts_close(struct input_dev *input)
 76{
 77	struct touchscreen_data *ts = input_get_drvdata(input);
 78
 79	micro_ts_toggle_receive(ts, false);
 80}
 81
 82static int micro_ts_probe(struct platform_device *pdev)
 83{
 84	struct ipaq_micro *micro = dev_get_drvdata(pdev->dev.parent);
 85	struct touchscreen_data *ts;
 86	int error;
 87
 88	ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL);
 89	if (!ts)
 90		return -ENOMEM;
 91
 92	ts->micro = micro;
 93
 94	ts->input = devm_input_allocate_device(&pdev->dev);
 95	if (!ts->input) {
 96		dev_err(&pdev->dev, "failed to allocate input device\n");
 97		return -ENOMEM;
 98	}
 99
100	ts->input->name = "ipaq micro ts";
101	ts->input->open = micro_ts_open;
102	ts->input->close = micro_ts_close;
103
104	input_set_drvdata(ts->input, ts);
105
106	input_set_capability(ts->input, EV_KEY, BTN_TOUCH);
107	input_set_capability(ts->input, EV_ABS, ABS_X);
108	input_set_capability(ts->input, EV_ABS, ABS_Y);
109	input_set_abs_params(ts->input, ABS_X, 0, 1023, 0, 0);
110	input_set_abs_params(ts->input, ABS_Y, 0, 1023, 0, 0);
111
112	error = input_register_device(ts->input);
113	if (error) {
114		dev_err(&pdev->dev, "error registering touch input\n");
115		return error;
116	}
117
118	platform_set_drvdata(pdev, ts);
119
120	dev_info(&pdev->dev, "iPAQ micro touchscreen\n");
121
122	return 0;
123}
124
125static int __maybe_unused micro_ts_suspend(struct device *dev)
126{
127	struct touchscreen_data *ts = dev_get_drvdata(dev);
128
129	micro_ts_toggle_receive(ts, false);
130
131	return 0;
132}
133
134static int __maybe_unused micro_ts_resume(struct device *dev)
135{
136	struct touchscreen_data *ts = dev_get_drvdata(dev);
137	struct input_dev *input = ts->input;
138
139	mutex_lock(&input->mutex);
140
141	if (input->users)
142		micro_ts_toggle_receive(ts, true);
143
144	mutex_unlock(&input->mutex);
145
146	return 0;
147}
148
149static const struct dev_pm_ops micro_ts_dev_pm_ops = {
150	SET_SYSTEM_SLEEP_PM_OPS(micro_ts_suspend, micro_ts_resume)
151};
152
153static struct platform_driver micro_ts_device_driver = {
154	.driver	= {
155		.name	= "ipaq-micro-ts",
156		.pm	= &micro_ts_dev_pm_ops,
157	},
158	.probe	= micro_ts_probe,
159};
160module_platform_driver(micro_ts_device_driver);
161
162MODULE_LICENSE("GPL");
163MODULE_DESCRIPTION("driver for iPAQ Atmel micro touchscreen");
164MODULE_ALIAS("platform:ipaq-micro-ts");