/* * Driver for Motorola PCAP2 touchscreen as found in the EZX phone platform. * *  Copyright (C) 2006 Harald Welte <laforge@openezx.org> *  Copyright (C) 2009 Daniel Ribeiro <drwyrm@gmail.com> * *  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. * */ #include <linux/module.h>#include <linux/init.h>#include <linux/fs.h>#include <linux/string.h>#include <linux/slab.h>#include <linux/pm.h>#include <linux/timer.h>#include <linux/interrupt.h>#include <linux/platform_device.h>#include <linux/input.h>#include <linux/mfd/ezx-pcap.h> struct pcap_ts {	struct pcap_chip *pcap;	struct input_dev *input;	struct delayed_work work;	u16 x, y;	u16 pressure;	u8 read_state;}; #define SAMPLE_DELAY	20 /* msecs */ #define X_AXIS_MIN	0#define X_AXIS_MAX	1023#define Y_AXIS_MAX	X_AXIS_MAX#define Y_AXIS_MIN	X_AXIS_MIN#define PRESSURE_MAX	X_AXIS_MAX#define PRESSURE_MIN	X_AXIS_MIN static void pcap_ts_read_xy(void *data, u16 res[2]){	struct pcap_ts *pcap_ts = data; 	switch (pcap_ts->read_state) {	case PCAP_ADC_TS_M_PRESSURE:		/* pressure reading is unreliable */		if (res[0] > PRESSURE_MIN && res[0] < PRESSURE_MAX)			pcap_ts->pressure = res[0];		pcap_ts->read_state = PCAP_ADC_TS_M_XY;		schedule_delayed_work(&pcap_ts->work, 0);		break;	case PCAP_ADC_TS_M_XY:		pcap_ts->y = res[0];		pcap_ts->x = res[1];		if (pcap_ts->x <= X_AXIS_MIN || pcap_ts->x >= X_AXIS_MAX ||		    pcap_ts->y <= Y_AXIS_MIN || pcap_ts->y >= Y_AXIS_MAX) {			/* pen has been released */			input_report_abs(pcap_ts->input, ABS_PRESSURE, 0);			input_report_key(pcap_ts->input, BTN_TOUCH, 0); 			pcap_ts->read_state = PCAP_ADC_TS_M_STANDBY;			schedule_delayed_work(&pcap_ts->work, 0);		} else {			/* pen is touching the screen */			input_report_abs(pcap_ts->input, ABS_X, pcap_ts->x);			input_report_abs(pcap_ts->input, ABS_Y, pcap_ts->y);			input_report_key(pcap_ts->input, BTN_TOUCH, 1);			input_report_abs(pcap_ts->input, ABS_PRESSURE,						pcap_ts->pressure); 			/* switch back to pressure read mode */			pcap_ts->read_state = PCAP_ADC_TS_M_PRESSURE;			schedule_delayed_work(&pcap_ts->work,					msecs_to_jiffies(SAMPLE_DELAY));		}		input_sync(pcap_ts->input);		break;	default:		dev_warn(&pcap_ts->input->dev,				"pcap_ts: Warning, unhandled read_state %d\n",				pcap_ts->read_state);		break;	}} static void pcap_ts_work(struct work_struct *work){	struct delayed_work *dw = container_of(work, struct delayed_work, work);	struct pcap_ts *pcap_ts = container_of(dw, struct pcap_ts, work);	u8 ch[2]; 	pcap_set_ts_bits(pcap_ts->pcap,			pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT); 	if (pcap_ts->read_state == PCAP_ADC_TS_M_STANDBY)		return; 	/* start adc conversion */	ch[0] = PCAP_ADC_CH_TS_X1;	ch[1] = PCAP_ADC_CH_TS_Y1;	pcap_adc_async(pcap_ts->pcap, PCAP_ADC_BANK_1, 0, ch,						pcap_ts_read_xy, pcap_ts);} static irqreturn_t pcap_ts_event_touch(int pirq, void *data){	struct pcap_ts *pcap_ts = data; 	if (pcap_ts->read_state == PCAP_ADC_TS_M_STANDBY) {		pcap_ts->read_state = PCAP_ADC_TS_M_PRESSURE;		schedule_delayed_work(&pcap_ts->work, 0);	}	return IRQ_HANDLED;} static int pcap_ts_open(struct input_dev *dev){	struct pcap_ts *pcap_ts = input_get_drvdata(dev); 	pcap_ts->read_state = PCAP_ADC_TS_M_STANDBY;	schedule_delayed_work(&pcap_ts->work, 0); 	return 0;} static void pcap_ts_close(struct input_dev *dev){	struct pcap_ts *pcap_ts = input_get_drvdata(dev); 	cancel_delayed_work_sync(&pcap_ts->work); 	pcap_ts->read_state = PCAP_ADC_TS_M_NONTS;	pcap_set_ts_bits(pcap_ts->pcap,				pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT);} static int pcap_ts_probe(struct platform_device *pdev){	struct input_dev *input_dev;	struct pcap_ts *pcap_ts;	int err = -ENOMEM; 	pcap_ts = kzalloc(sizeof(*pcap_ts), GFP_KERNEL);	if (!pcap_ts)		return err; 	pcap_ts->pcap = dev_get_drvdata(pdev->dev.parent);	platform_set_drvdata(pdev, pcap_ts); 	input_dev = input_allocate_device();	if (!input_dev)		goto fail; 	INIT_DELAYED_WORK(&pcap_ts->work, pcap_ts_work); 	pcap_ts->read_state = PCAP_ADC_TS_M_NONTS;	pcap_set_ts_bits(pcap_ts->pcap,				pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT); 	pcap_ts->input = input_dev;	input_set_drvdata(input_dev, pcap_ts); 	input_dev->name = "pcap-touchscreen";	input_dev->phys = "pcap_ts/input0";	input_dev->id.bustype = BUS_HOST;	input_dev->id.vendor = 0x0001;	input_dev->id.product = 0x0002;	input_dev->id.version = 0x0100;	input_dev->dev.parent = &pdev->dev;	input_dev->open = pcap_ts_open;	input_dev->close = pcap_ts_close; 	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);	input_set_abs_params(input_dev, ABS_X, X_AXIS_MIN, X_AXIS_MAX, 0, 0);	input_set_abs_params(input_dev, ABS_Y, Y_AXIS_MIN, Y_AXIS_MAX, 0, 0);	input_set_abs_params(input_dev, ABS_PRESSURE, PRESSURE_MIN,			     PRESSURE_MAX, 0, 0); 	err = input_register_device(pcap_ts->input);	if (err)		goto fail_allocate; 	err = request_irq(pcap_to_irq(pcap_ts->pcap, PCAP_IRQ_TS),			pcap_ts_event_touch, 0, "Touch Screen", pcap_ts);	if (err)		goto fail_register; 	return 0; fail_register:	input_unregister_device(input_dev);	goto fail;fail_allocate:	input_free_device(input_dev);fail:	kfree(pcap_ts); 	return err;} static int pcap_ts_remove(struct platform_device *pdev){	struct pcap_ts *pcap_ts = platform_get_drvdata(pdev); 	free_irq(pcap_to_irq(pcap_ts->pcap, PCAP_IRQ_TS), pcap_ts);	cancel_delayed_work_sync(&pcap_ts->work); 	input_unregister_device(pcap_ts->input); 	kfree(pcap_ts); 	return 0;} #ifdef CONFIG_PMstatic int pcap_ts_suspend(struct device *dev){	struct pcap_ts *pcap_ts = dev_get_drvdata(dev); 	pcap_set_ts_bits(pcap_ts->pcap, PCAP_ADC_TS_REF_LOWPWR);	return 0;} static int pcap_ts_resume(struct device *dev){	struct pcap_ts *pcap_ts = dev_get_drvdata(dev); 	pcap_set_ts_bits(pcap_ts->pcap,				pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT);	return 0;} static const struct dev_pm_ops pcap_ts_pm_ops = {	.suspend	= pcap_ts_suspend,	.resume		= pcap_ts_resume,};#define PCAP_TS_PM_OPS (&pcap_ts_pm_ops)#else#define PCAP_TS_PM_OPS NULL#endif static struct platform_driver pcap_ts_driver = {	.probe		= pcap_ts_probe,	.remove		= pcap_ts_remove,	.driver		= {		.name	= "pcap-ts",		.owner	= THIS_MODULE,		.pm	= PCAP_TS_PM_OPS,	},};module_platform_driver(pcap_ts_driver); MODULE_DESCRIPTION("Motorola PCAP2 touchscreen driver");MODULE_AUTHOR("Daniel Ribeiro / Harald Welte");MODULE_LICENSE("GPL");MODULE_ALIAS("platform:pcap_ts");