[deliverable/linux.git] / drivers / input / touchscreen / ipaq-micro-ts.c

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 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;

	spin_lock_irq(&micro->lock);

	if (enable) {
		micro->ts = micro_ts_receive;
		micro->ts_data = ts;
	} else {
		micro->ts = NULL;
		micro->ts_data = NULL;
	}

	spin_unlock_irq(&ts->micro->lock);
}

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 __maybe_unused micro_ts_suspend(struct device *dev)
{
	struct touchscreen_data *ts = dev_get_drvdata(dev);

	micro_ts_toggle_receive(ts, false);

	return 0;
}

static int __maybe_unused micro_ts_resume(struct device *dev)
{
	struct touchscreen_data *ts = dev_get_drvdata(dev);
	struct input_dev *input = ts->input;

	mutex_lock(&input->mutex);

	if (input->users)
		micro_ts_toggle_receive(ts, true);

	mutex_unlock(&input->mutex);

	return 0;
}

static const struct dev_pm_ops micro_ts_dev_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(micro_ts_suspend, micro_ts_resume)
};

static struct platform_driver micro_ts_device_driver = {
	.driver	= {
		.name	= "ipaq-micro-ts",
		.pm	= &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");
Commit	Line	Data
3ea7e551 DA	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
	25	struct touchscreen_data {
	26	struct input_dev *input;
	27	struct ipaq_micro *micro;
	28	};
	29
	30	static 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
f348f329 DT	49	static 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
	66	static 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
	75	static 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
3ea7e551 DA	82	static int micro_ts_probe(struct platform_device *pdev)
3ea7e551 DA	83	{
f348f329	84	struct ipaq_micro *micro = dev_get_drvdata(pdev->dev.parent);
3ea7e551	85	struct touchscreen_data *ts;
f348f329	86	int error;
3ea7e551 DA	87
	88	ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL);
	89	if (!ts)
	90	return -ENOMEM;
3ea7e551	91
f348f329	92	ts->micro = micro;
3ea7e551 DA	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
f348f329 DT	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
3ea7e551 DA	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
f348f329 DT	112	error = input_register_device(ts->input);
f348f329 DT	113	if (error) {
3ea7e551	114	dev_err(&pdev->dev, "error registering touch input\n");
f348f329	115	return error;
3ea7e551 DA	116	}
3ea7e551 DA	117
f348f329	118	platform_set_drvdata(pdev, ts);
3ea7e551 DA	119
3ea7e551 DA	120	dev_info(&pdev->dev, "iPAQ micro touchscreen\n");
3ea7e551 DA	121
	122	return 0;
	123	}
	124
02b6a58b	125	static int __maybe_unused micro_ts_suspend(struct device *dev)
3ea7e551 DA	126	{
	127	struct touchscreen_data *ts = dev_get_drvdata(dev);
	128
f348f329 DT	129	micro_ts_toggle_receive(ts, false);
f348f329 DT	130
3ea7e551 DA	131	return 0;
	132	}
	133
02b6a58b	134	static int __maybe_unused micro_ts_resume(struct device *dev)
3ea7e551 DA	135	{
3ea7e551 DA	136	struct touchscreen_data *ts = dev_get_drvdata(dev);
f348f329 DT	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);
3ea7e551	145
3ea7e551 DA	146	return 0;
3ea7e551 DA	147	}
3ea7e551 DA	148
	149	static const struct dev_pm_ops micro_ts_dev_pm_ops = {
	150	SET_SYSTEM_SLEEP_PM_OPS(micro_ts_suspend, micro_ts_resume)
	151	};
	152
	153	static 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,
3ea7e551 DA	159	};
	160	module_platform_driver(micro_ts_device_driver);
	161
	162	MODULE_LICENSE("GPL");
	163	MODULE_DESCRIPTION("driver for iPAQ Atmel micro touchscreen");
	164	MODULE_ALIAS("platform:ipaq-micro-ts");