[linux-2.6-block.git] / drivers / input / touchscreen / ucb1400_ts.c

/*
 *  Philips UCB1400 touchscreen driver
 *
 *  Author:	Nicolas Pitre
 *  Created:	September 25, 2006
 *  Copyright:	MontaVista Software, Inc.
 *
 * Spliting done by: Marek Vasut <marek.vasut@gmail.com>
 * If something doesn't work and it worked before spliting, e-mail me,
 * dont bother Nicolas please ;-)
 *
 * 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.
 *
 * This code is heavily based on ucb1x00-*.c copyrighted by Russell King
 * covering the UCB1100, UCB1200 and UCB1300..  Support for the UCB1400 has
 * been made separate from ucb1x00-core/ucb1x00-ts on Russell's request.
 */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/input.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/ucb1400.h>

#define UCB1400_TS_POLL_PERIOD	10 /* ms */

static bool adcsync;
static int ts_delay = 55; /* us */
static int ts_delay_pressure;	/* us */

/* Switch to interrupt mode. */
static void ucb1400_ts_mode_int(struct ucb1400_ts *ucb)
{
	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
			UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW |
			UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND |
			UCB_TS_CR_MODE_INT);
}

/*
 * Switch to pressure mode, and read pressure.  We don't need to wait
 * here, since both plates are being driven.
 */
static unsigned int ucb1400_ts_read_pressure(struct ucb1400_ts *ucb)
{
	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
			UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW |
			UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND |
			UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);

	udelay(ts_delay_pressure);

	return ucb1400_adc_read(ucb->ac97, UCB_ADC_INP_TSPY, adcsync);
}

/*
 * Switch to X position mode and measure Y plate.  We switch the plate
 * configuration in pressure mode, then switch to position mode.  This
 * gives a faster response time.  Even so, we need to wait about 55us
 * for things to stabilise.
 */
static unsigned int ucb1400_ts_read_xpos(struct ucb1400_ts *ucb)
{
	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
			UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
			UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
			UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
			UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
			UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
			UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);

	udelay(ts_delay);

	return ucb1400_adc_read(ucb->ac97, UCB_ADC_INP_TSPY, adcsync);
}

/*
 * Switch to Y position mode and measure X plate.  We switch the plate
 * configuration in pressure mode, then switch to position mode.  This
 * gives a faster response time.  Even so, we need to wait about 55us
 * for things to stabilise.
 */
static int ucb1400_ts_read_ypos(struct ucb1400_ts *ucb)
{
	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
			UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
			UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
			UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
			UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
			UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
			UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);

	udelay(ts_delay);

	return ucb1400_adc_read(ucb->ac97, UCB_ADC_INP_TSPX, adcsync);
}

/*
 * Switch to X plate resistance mode.  Set MX to ground, PX to
 * supply.  Measure current.
 */
static unsigned int ucb1400_ts_read_xres(struct ucb1400_ts *ucb)
{
	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
			UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
			UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
	return ucb1400_adc_read(ucb->ac97, 0, adcsync);
}

/*
 * Switch to Y plate resistance mode.  Set MY to ground, PY to
 * supply.  Measure current.
 */
static unsigned int ucb1400_ts_read_yres(struct ucb1400_ts *ucb)
{
	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
			UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
			UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
	return ucb1400_adc_read(ucb->ac97, 0, adcsync);
}

static int ucb1400_ts_pen_up(struct ucb1400_ts *ucb)
{
	unsigned short val = ucb1400_reg_read(ucb->ac97, UCB_TS_CR);

	return val & (UCB_TS_CR_TSPX_LOW | UCB_TS_CR_TSMX_LOW);
}

static void ucb1400_ts_irq_enable(struct ucb1400_ts *ucb)
{
	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, UCB_IE_TSPX);
	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);
	ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, UCB_IE_TSPX);
}

static void ucb1400_ts_irq_disable(struct ucb1400_ts *ucb)
{
	ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, 0);
}

static void ucb1400_ts_report_event(struct input_dev *idev, u16 pressure, u16 x, u16 y)
{
	input_report_abs(idev, ABS_X, x);
	input_report_abs(idev, ABS_Y, y);
	input_report_abs(idev, ABS_PRESSURE, pressure);
	input_report_key(idev, BTN_TOUCH, 1);
	input_sync(idev);
}

static void ucb1400_ts_event_release(struct input_dev *idev)
{
	input_report_abs(idev, ABS_PRESSURE, 0);
	input_report_key(idev, BTN_TOUCH, 0);
	input_sync(idev);
}

static void ucb1400_clear_pending_irq(struct ucb1400_ts *ucb)
{
	unsigned int isr;

	isr = ucb1400_reg_read(ucb->ac97, UCB_IE_STATUS);
	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, isr);
	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);

	if (isr & UCB_IE_TSPX)
		ucb1400_ts_irq_disable(ucb);
	else
		dev_dbg(&ucb->ts_idev->dev,
			"ucb1400: unexpected IE_STATUS = %#x\n", isr);
}

/*
 * A restriction with interrupts exists when using the ucb1400, as
 * the codec read/write routines may sleep while waiting for codec
 * access completion and uses semaphores for access control to the
 * AC97 bus. Therefore the driver is forced to use threaded interrupt
 * handler.
 */
static irqreturn_t ucb1400_irq(int irqnr, void *devid)
{
	struct ucb1400_ts *ucb = devid;
	unsigned int x, y, p;
	bool penup;

	if (unlikely(irqnr != ucb->irq))
		return IRQ_NONE;

	ucb1400_clear_pending_irq(ucb);

	/* Start with a small delay before checking pendown state */
	msleep(UCB1400_TS_POLL_PERIOD);

	while (!ucb->stopped && !(penup = ucb1400_ts_pen_up(ucb))) {

		ucb1400_adc_enable(ucb->ac97);
		x = ucb1400_ts_read_xpos(ucb);
		y = ucb1400_ts_read_ypos(ucb);
		p = ucb1400_ts_read_pressure(ucb);
		ucb1400_adc_disable(ucb->ac97);

		ucb1400_ts_report_event(ucb->ts_idev, p, x, y);

		wait_event_timeout(ucb->ts_wait, ucb->stopped,
				   msecs_to_jiffies(UCB1400_TS_POLL_PERIOD));
	}

	ucb1400_ts_event_release(ucb->ts_idev);

	if (!ucb->stopped) {
		/* Switch back to interrupt mode. */
		ucb1400_ts_mode_int(ucb);
		ucb1400_ts_irq_enable(ucb);
	}

	return IRQ_HANDLED;
}

static void ucb1400_ts_stop(struct ucb1400_ts *ucb)
{
	/* Signal IRQ thread to stop polling and disable the handler. */
	ucb->stopped = true;
	mb();
	wake_up(&ucb->ts_wait);
	disable_irq(ucb->irq);

	ucb1400_ts_irq_disable(ucb);
	ucb1400_reg_write(ucb->ac97, UCB_TS_CR, 0);
}

/* Must be called with ts->lock held */
static void ucb1400_ts_start(struct ucb1400_ts *ucb)
{
	/* Tell IRQ thread that it may poll the device. */
	ucb->stopped = false;
	mb();

	ucb1400_ts_mode_int(ucb);
	ucb1400_ts_irq_enable(ucb);

	enable_irq(ucb->irq);
}

static int ucb1400_ts_open(struct input_dev *idev)
{
	struct ucb1400_ts *ucb = input_get_drvdata(idev);

	ucb1400_ts_start(ucb);

	return 0;
}

static void ucb1400_ts_close(struct input_dev *idev)
{
	struct ucb1400_ts *ucb = input_get_drvdata(idev);

	ucb1400_ts_stop(ucb);
}

#ifndef NO_IRQ
#define NO_IRQ	0
#endif

/*
 * Try to probe our interrupt, rather than relying on lots of
 * hard-coded machine dependencies.
 */
static int ucb1400_ts_detect_irq(struct ucb1400_ts *ucb,
					   struct platform_device *pdev)
{
	unsigned long mask, timeout;

	mask = probe_irq_on();

	/* Enable the ADC interrupt. */
	ucb1400_reg_write(ucb->ac97, UCB_IE_RIS, UCB_IE_ADC);
	ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, UCB_IE_ADC);
	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0xffff);
	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);

	/* Cause an ADC interrupt. */
	ucb1400_reg_write(ucb->ac97, UCB_ADC_CR, UCB_ADC_ENA);
	ucb1400_reg_write(ucb->ac97, UCB_ADC_CR, UCB_ADC_ENA | UCB_ADC_START);

	/* Wait for the conversion to complete. */
	timeout = jiffies + HZ/2;
	while (!(ucb1400_reg_read(ucb->ac97, UCB_ADC_DATA) &
						UCB_ADC_DAT_VALID)) {
		cpu_relax();
		if (time_after(jiffies, timeout)) {
			dev_err(&pdev->dev, "timed out in IRQ probe\n");
			probe_irq_off(mask);
			return -ENODEV;
		}
	}
	ucb1400_reg_write(ucb->ac97, UCB_ADC_CR, 0);

	/* Disable and clear interrupt. */
	ucb1400_reg_write(ucb->ac97, UCB_IE_RIS, 0);
	ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, 0);
	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0xffff);
	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);

	/* Read triggered interrupt. */
	ucb->irq = probe_irq_off(mask);
	if (ucb->irq < 0 || ucb->irq == NO_IRQ)
		return -ENODEV;

	return 0;
}

static int ucb1400_ts_probe(struct platform_device *pdev)
{
	struct ucb1400_ts *ucb = dev_get_platdata(&pdev->dev);
	int error, x_res, y_res;
	u16 fcsr;

	ucb->ts_idev = input_allocate_device();
	if (!ucb->ts_idev) {
		error = -ENOMEM;
		goto err;
	}

	/* Only in case the IRQ line wasn't supplied, try detecting it */
	if (ucb->irq < 0) {
		error = ucb1400_ts_detect_irq(ucb, pdev);
		if (error) {
			dev_err(&pdev->dev, "IRQ probe failed\n");
			goto err_free_devs;
		}
	}
	dev_dbg(&pdev->dev, "found IRQ %d\n", ucb->irq);

	init_waitqueue_head(&ucb->ts_wait);

	input_set_drvdata(ucb->ts_idev, ucb);

	ucb->ts_idev->dev.parent	= &pdev->dev;
	ucb->ts_idev->name		= "UCB1400 touchscreen interface";
	ucb->ts_idev->id.vendor		= ucb1400_reg_read(ucb->ac97,
						AC97_VENDOR_ID1);
	ucb->ts_idev->id.product	= ucb->id;
	ucb->ts_idev->open		= ucb1400_ts_open;
	ucb->ts_idev->close		= ucb1400_ts_close;
	ucb->ts_idev->evbit[0]		= BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY);
	ucb->ts_idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);

	/*
	 * Enable ADC filter to prevent horrible jitter on Colibri.
	 * This also further reduces jitter on boards where ADCSYNC
	 * pin is connected.
	 */
	fcsr = ucb1400_reg_read(ucb->ac97, UCB_FCSR);
	ucb1400_reg_write(ucb->ac97, UCB_FCSR, fcsr | UCB_FCSR_AVE);

	ucb1400_adc_enable(ucb->ac97);
	x_res = ucb1400_ts_read_xres(ucb);
	y_res = ucb1400_ts_read_yres(ucb);
	ucb1400_adc_disable(ucb->ac97);
	dev_dbg(&pdev->dev, "x/y = %d/%d\n", x_res, y_res);

	input_set_abs_params(ucb->ts_idev, ABS_X, 0, x_res, 0, 0);
	input_set_abs_params(ucb->ts_idev, ABS_Y, 0, y_res, 0, 0);
	input_set_abs_params(ucb->ts_idev, ABS_PRESSURE, 0, 0, 0, 0);

	ucb1400_ts_stop(ucb);

	error = request_threaded_irq(ucb->irq, NULL, ucb1400_irq,
				     IRQF_TRIGGER_RISING | IRQF_ONESHOT,
				     "UCB1400", ucb);
	if (error) {
		dev_err(&pdev->dev,
			"unable to grab irq%d: %d\n", ucb->irq, error);
		goto err_free_devs;
	}

	error = input_register_device(ucb->ts_idev);
	if (error)
		goto err_free_irq;

	return 0;

err_free_irq:
	free_irq(ucb->irq, ucb);
err_free_devs:
	input_free_device(ucb->ts_idev);
err:
	return error;
}

static int ucb1400_ts_remove(struct platform_device *pdev)
{
	struct ucb1400_ts *ucb = dev_get_platdata(&pdev->dev);

	free_irq(ucb->irq, ucb);
	input_unregister_device(ucb->ts_idev);

	return 0;
}

static int __maybe_unused ucb1400_ts_suspend(struct device *dev)
{
	struct ucb1400_ts *ucb = dev_get_platdata(dev);
	struct input_dev *idev = ucb->ts_idev;

	mutex_lock(&idev->mutex);

	if (idev->users)
		ucb1400_ts_stop(ucb);

	mutex_unlock(&idev->mutex);
	return 0;
}

static int __maybe_unused ucb1400_ts_resume(struct device *dev)
{
	struct ucb1400_ts *ucb = dev_get_platdata(dev);
	struct input_dev *idev = ucb->ts_idev;

	mutex_lock(&idev->mutex);

	if (idev->users)
		ucb1400_ts_start(ucb);

	mutex_unlock(&idev->mutex);
	return 0;
}

static SIMPLE_DEV_PM_OPS(ucb1400_ts_pm_ops,
			 ucb1400_ts_suspend, ucb1400_ts_resume);

static struct platform_driver ucb1400_ts_driver = {
	.probe	= ucb1400_ts_probe,
	.remove	= ucb1400_ts_remove,
	.driver	= {
		.name	= "ucb1400_ts",
		.pm	= &ucb1400_ts_pm_ops,
	},
};
module_platform_driver(ucb1400_ts_driver);

module_param(adcsync, bool, 0444);
MODULE_PARM_DESC(adcsync, "Synchronize touch readings with ADCSYNC pin.");

module_param(ts_delay, int, 0444);
MODULE_PARM_DESC(ts_delay, "Delay between panel setup and"
			    " position read. Default = 55us.");

module_param(ts_delay_pressure, int, 0444);
MODULE_PARM_DESC(ts_delay_pressure,
		"delay between panel setup and pressure read."
		"  Default = 0us.");

MODULE_DESCRIPTION("Philips UCB1400 touchscreen driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
f40219bf NP	1	/*
	2	* Philips UCB1400 touchscreen driver
	3	*
	4	* Author: Nicolas Pitre
	5	* Created: September 25, 2006
	6	* Copyright: MontaVista Software, Inc.
	7	*
d9105c2b	8	* Spliting done by: Marek Vasut <marek.vasut@gmail.com>
25985edc	9	* If something doesn't work and it worked before spliting, e-mail me,
d9105c2b MV	10	* dont bother Nicolas please ;-)
d9105c2b MV	11	*
f40219bf NP	12	* This program is free software; you can redistribute it and/or modify
	13	* it under the terms of the GNU General Public License version 2 as
	14	* published by the Free Software Foundation.
	15	*
	16	* This code is heavily based on ucb1x00-*.c copyrighted by Russell King
	17	* covering the UCB1100, UCB1200 and UCB1300.. Support for the UCB1400 has
	18	* been made separate from ucb1x00-core/ucb1x00-ts on Russell's request.
	19	*/
	20
	21	#include <linux/module.h>
f40219bf	22	#include <linux/delay.h>
c899afed DT	23	#include <linux/sched.h>
c899afed DT	24	#include <linux/wait.h>
f40219bf NP	25	#include <linux/input.h>
	26	#include <linux/device.h>
	27	#include <linux/interrupt.h>
d9105c2b	28	#include <linux/ucb1400.h>
f40219bf	29
c899afed DT	30	#define UCB1400_TS_POLL_PERIOD 10 /* ms */
c899afed DT	31
90ab5ee9	32	static bool adcsync;
b5b16c52 CB	33	static int ts_delay = 55; /* us */
b5b16c52 CB	34	static int ts_delay_pressure; /* us */
f40219bf	35
f40219bf	36	/* Switch to interrupt mode. */
c899afed	37	static void ucb1400_ts_mode_int(struct ucb1400_ts *ucb)
f40219bf	38	{
c899afed	39	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
f40219bf NP	40	UCB_TS_CR_TSMX_POW \| UCB_TS_CR_TSPX_POW \|
	41	UCB_TS_CR_TSMY_GND \| UCB_TS_CR_TSPY_GND \|
	42	UCB_TS_CR_MODE_INT);
	43	}
	44
	45	/*
	46	* Switch to pressure mode, and read pressure. We don't need to wait
	47	* here, since both plates are being driven.
	48	*/
75072323	49	static unsigned int ucb1400_ts_read_pressure(struct ucb1400_ts *ucb)
f40219bf	50	{
d9105c2b	51	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
f40219bf NP	52	UCB_TS_CR_TSMX_POW \| UCB_TS_CR_TSPX_POW \|
	53	UCB_TS_CR_TSMY_GND \| UCB_TS_CR_TSPY_GND \|
	54	UCB_TS_CR_MODE_PRES \| UCB_TS_CR_BIAS_ENA);
c899afed	55
b5b16c52	56	udelay(ts_delay_pressure);
c899afed	57
d9105c2b	58	return ucb1400_adc_read(ucb->ac97, UCB_ADC_INP_TSPY, adcsync);
f40219bf NP	59	}
	60
	61	/*
	62	* Switch to X position mode and measure Y plate. We switch the plate
	63	* configuration in pressure mode, then switch to position mode. This
	64	* gives a faster response time. Even so, we need to wait about 55us
	65	* for things to stabilise.
	66	*/
75072323	67	static unsigned int ucb1400_ts_read_xpos(struct ucb1400_ts *ucb)
f40219bf	68	{
d9105c2b	69	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
f40219bf NP	70	UCB_TS_CR_TSMX_GND \| UCB_TS_CR_TSPX_POW \|
f40219bf NP	71	UCB_TS_CR_MODE_PRES \| UCB_TS_CR_BIAS_ENA);
d9105c2b	72	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
f40219bf NP	73	UCB_TS_CR_TSMX_GND \| UCB_TS_CR_TSPX_POW \|
f40219bf NP	74	UCB_TS_CR_MODE_PRES \| UCB_TS_CR_BIAS_ENA);
d9105c2b	75	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
f40219bf NP	76	UCB_TS_CR_TSMX_GND \| UCB_TS_CR_TSPX_POW \|
	77	UCB_TS_CR_MODE_POS \| UCB_TS_CR_BIAS_ENA);
	78
b5b16c52	79	udelay(ts_delay);
f40219bf	80
d9105c2b	81	return ucb1400_adc_read(ucb->ac97, UCB_ADC_INP_TSPY, adcsync);
f40219bf NP	82	}
	83
	84	/*
	85	* Switch to Y position mode and measure X plate. We switch the plate
	86	* configuration in pressure mode, then switch to position mode. This
	87	* gives a faster response time. Even so, we need to wait about 55us
	88	* for things to stabilise.
	89	*/
75072323	90	static int ucb1400_ts_read_ypos(struct ucb1400_ts *ucb)
f40219bf	91	{
d9105c2b	92	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
f40219bf NP	93	UCB_TS_CR_TSMY_GND \| UCB_TS_CR_TSPY_POW \|
f40219bf NP	94	UCB_TS_CR_MODE_PRES \| UCB_TS_CR_BIAS_ENA);
d9105c2b	95	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
f40219bf NP	96	UCB_TS_CR_TSMY_GND \| UCB_TS_CR_TSPY_POW \|
f40219bf NP	97	UCB_TS_CR_MODE_PRES \| UCB_TS_CR_BIAS_ENA);
d9105c2b	98	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
f40219bf NP	99	UCB_TS_CR_TSMY_GND \| UCB_TS_CR_TSPY_POW \|
	100	UCB_TS_CR_MODE_POS \| UCB_TS_CR_BIAS_ENA);
	101
b5b16c52	102	udelay(ts_delay);
f40219bf	103
d9105c2b	104	return ucb1400_adc_read(ucb->ac97, UCB_ADC_INP_TSPX, adcsync);
f40219bf NP	105	}
	106
	107	/*
	108	* Switch to X plate resistance mode. Set MX to ground, PX to
	109	* supply. Measure current.
	110	*/
75072323	111	static unsigned int ucb1400_ts_read_xres(struct ucb1400_ts *ucb)
f40219bf	112	{
d9105c2b	113	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
f40219bf NP	114	UCB_TS_CR_TSMX_GND \| UCB_TS_CR_TSPX_POW \|
f40219bf NP	115	UCB_TS_CR_MODE_PRES \| UCB_TS_CR_BIAS_ENA);
d9105c2b	116	return ucb1400_adc_read(ucb->ac97, 0, adcsync);
f40219bf NP	117	}
	118
	119	/*
	120	* Switch to Y plate resistance mode. Set MY to ground, PY to
	121	* supply. Measure current.
	122	*/
75072323	123	static unsigned int ucb1400_ts_read_yres(struct ucb1400_ts *ucb)
f40219bf	124	{
d9105c2b	125	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
f40219bf NP	126	UCB_TS_CR_TSMY_GND \| UCB_TS_CR_TSPY_POW \|
f40219bf NP	127	UCB_TS_CR_MODE_PRES \| UCB_TS_CR_BIAS_ENA);
d9105c2b	128	return ucb1400_adc_read(ucb->ac97, 0, adcsync);
f40219bf NP	129	}
f40219bf NP	130
c899afed	131	static int ucb1400_ts_pen_up(struct ucb1400_ts *ucb)
f40219bf	132	{
c899afed	133	unsigned short val = ucb1400_reg_read(ucb->ac97, UCB_TS_CR);
f9c22736	134
d9105c2b	135	return val & (UCB_TS_CR_TSPX_LOW \| UCB_TS_CR_TSMX_LOW);
f40219bf NP	136	}
f40219bf NP	137
c899afed	138	static void ucb1400_ts_irq_enable(struct ucb1400_ts *ucb)
f40219bf	139	{
c899afed DT	140	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, UCB_IE_TSPX);
	141	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);
	142	ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, UCB_IE_TSPX);
f40219bf NP	143	}
f40219bf NP	144
c899afed	145	static void ucb1400_ts_irq_disable(struct ucb1400_ts *ucb)
f40219bf	146	{
c899afed	147	ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, 0);
f40219bf NP	148	}
f40219bf NP	149
c899afed	150	static void ucb1400_ts_report_event(struct input_dev *idev, u16 pressure, u16 x, u16 y)
f40219bf NP	151	{
	152	input_report_abs(idev, ABS_X, x);
	153	input_report_abs(idev, ABS_Y, y);
	154	input_report_abs(idev, ABS_PRESSURE, pressure);
cd2d64b1	155	input_report_key(idev, BTN_TOUCH, 1);
f40219bf NP	156	input_sync(idev);
	157	}
	158
	159	static void ucb1400_ts_event_release(struct input_dev *idev)
	160	{
	161	input_report_abs(idev, ABS_PRESSURE, 0);
cd2d64b1	162	input_report_key(idev, BTN_TOUCH, 0);
f40219bf NP	163	input_sync(idev);
	164	}
	165
c899afed	166	static void ucb1400_clear_pending_irq(struct ucb1400_ts *ucb)
f40219bf NP	167	{
	168	unsigned int isr;
	169
d9105c2b MV	170	isr = ucb1400_reg_read(ucb->ac97, UCB_IE_STATUS);
	171	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, isr);
	172	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);
f40219bf	173
9b2fb2da	174	if (isr & UCB_IE_TSPX)
c899afed	175	ucb1400_ts_irq_disable(ucb);
9b2fb2da	176	else
c899afed DT	177	dev_dbg(&ucb->ts_idev->dev,
c899afed DT	178	"ucb1400: unexpected IE_STATUS = %#x\n", isr);
f40219bf NP	179	}
f40219bf NP	180
c899afed DT	181	/*
	182	* A restriction with interrupts exists when using the ucb1400, as
	183	* the codec read/write routines may sleep while waiting for codec
	184	* access completion and uses semaphores for access control to the
	185	* AC97 bus. Therefore the driver is forced to use threaded interrupt
	186	* handler.
	187	*/
	188	static irqreturn_t ucb1400_irq(int irqnr, void *devid)
f40219bf	189	{
c899afed DT	190	struct ucb1400_ts *ucb = devid;
	191	unsigned int x, y, p;
	192	bool penup;
f40219bf	193
c899afed DT	194	if (unlikely(irqnr != ucb->irq))
c899afed DT	195	return IRQ_NONE;
f40219bf	196
c899afed	197	ucb1400_clear_pending_irq(ucb);
f40219bf	198
c899afed DT	199	/* Start with a small delay before checking pendown state */
c899afed DT	200	msleep(UCB1400_TS_POLL_PERIOD);
f40219bf	201
c899afed	202	while (!ucb->stopped && !(penup = ucb1400_ts_pen_up(ucb))) {
f40219bf	203
d9105c2b	204	ucb1400_adc_enable(ucb->ac97);
f40219bf NP	205	x = ucb1400_ts_read_xpos(ucb);
	206	y = ucb1400_ts_read_ypos(ucb);
	207	p = ucb1400_ts_read_pressure(ucb);
d9105c2b	208	ucb1400_adc_disable(ucb->ac97);
f40219bf	209
c899afed	210	ucb1400_ts_report_event(ucb->ts_idev, p, x, y);
f40219bf	211
c899afed DT	212	wait_event_timeout(ucb->ts_wait, ucb->stopped,
c899afed DT	213	msecs_to_jiffies(UCB1400_TS_POLL_PERIOD));
f40219bf NP	214	}
f40219bf NP	215
c899afed	216	ucb1400_ts_event_release(ucb->ts_idev);
f40219bf	217
c899afed DT	218	if (!ucb->stopped) {
	219	/* Switch back to interrupt mode. */
	220	ucb1400_ts_mode_int(ucb);
	221	ucb1400_ts_irq_enable(ucb);
	222	}
	223
	224	return IRQ_HANDLED;
f40219bf NP	225	}
f40219bf NP	226
c899afed	227	static void ucb1400_ts_stop(struct ucb1400_ts *ucb)
f40219bf	228	{
c899afed DT	229	/* Signal IRQ thread to stop polling and disable the handler. */
	230	ucb->stopped = true;
	231	mb();
	232	wake_up(&ucb->ts_wait);
	233	disable_irq(ucb->irq);
f40219bf	234
c899afed DT	235	ucb1400_ts_irq_disable(ucb);
	236	ucb1400_reg_write(ucb->ac97, UCB_TS_CR, 0);
	237	}
	238
	239	/* Must be called with ts->lock held */
	240	static void ucb1400_ts_start(struct ucb1400_ts *ucb)
	241	{
	242	/* Tell IRQ thread that it may poll the device. */
	243	ucb->stopped = false;
	244	mb();
	245
	246	ucb1400_ts_mode_int(ucb);
	247	ucb1400_ts_irq_enable(ucb);
	248
	249	enable_irq(ucb->irq);
f40219bf NP	250	}
	251
	252	static int ucb1400_ts_open(struct input_dev *idev)
	253	{
d9105c2b	254	struct ucb1400_ts *ucb = input_get_drvdata(idev);
f40219bf	255
c899afed	256	ucb1400_ts_start(ucb);
f40219bf	257
c899afed	258	return 0;
f40219bf NP	259	}
	260
	261	static void ucb1400_ts_close(struct input_dev *idev)
	262	{
d9105c2b	263	struct ucb1400_ts *ucb = input_get_drvdata(idev);
f40219bf	264
c899afed	265	ucb1400_ts_stop(ucb);
f40219bf	266	}
f40219bf NP	267
	268	#ifndef NO_IRQ
	269	#define NO_IRQ 0
	270	#endif
	271
	272	/*
	273	* Try to probe our interrupt, rather than relying on lots of
	274	* hard-coded machine dependencies.
	275	*/
5298cc4c	276	static int ucb1400_ts_detect_irq(struct ucb1400_ts *ucb,
bd100e2c	277	struct platform_device *pdev)
f40219bf NP	278	{
	279	unsigned long mask, timeout;
	280
	281	mask = probe_irq_on();
f40219bf NP	282
f40219bf NP	283	/* Enable the ADC interrupt. */
d9105c2b MV	284	ucb1400_reg_write(ucb->ac97, UCB_IE_RIS, UCB_IE_ADC);
	285	ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, UCB_IE_ADC);
	286	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0xffff);
	287	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);
f40219bf NP	288
f40219bf NP	289	/* Cause an ADC interrupt. */
d9105c2b MV	290	ucb1400_reg_write(ucb->ac97, UCB_ADC_CR, UCB_ADC_ENA);
d9105c2b MV	291	ucb1400_reg_write(ucb->ac97, UCB_ADC_CR, UCB_ADC_ENA \| UCB_ADC_START);
f40219bf NP	292
	293	/* Wait for the conversion to complete. */
	294	timeout = jiffies + HZ/2;
d9105c2b MV	295	while (!(ucb1400_reg_read(ucb->ac97, UCB_ADC_DATA) &
d9105c2b MV	296	UCB_ADC_DAT_VALID)) {
f40219bf NP	297	cpu_relax();
f40219bf NP	298	if (time_after(jiffies, timeout)) {
bd100e2c	299	dev_err(&pdev->dev, "timed out in IRQ probe\n");
f40219bf NP	300	probe_irq_off(mask);
	301	return -ENODEV;
	302	}
	303	}
d9105c2b	304	ucb1400_reg_write(ucb->ac97, UCB_ADC_CR, 0);
f40219bf NP	305
f40219bf NP	306	/* Disable and clear interrupt. */
d9105c2b MV	307	ucb1400_reg_write(ucb->ac97, UCB_IE_RIS, 0);
	308	ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, 0);
	309	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0xffff);
	310	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);
f40219bf NP	311
	312	/* Read triggered interrupt. */
	313	ucb->irq = probe_irq_off(mask);
	314	if (ucb->irq < 0 \|\| ucb->irq == NO_IRQ)
	315	return -ENODEV;
	316
	317	return 0;
	318	}
	319
5298cc4c	320	static int ucb1400_ts_probe(struct platform_device *pdev)
f40219bf	321	{
c838cb3d	322	struct ucb1400_ts *ucb = dev_get_platdata(&pdev->dev);
d9105c2b	323	int error, x_res, y_res;
1700f5fd	324	u16 fcsr;
f40219bf	325
d9105c2b MV	326	ucb->ts_idev = input_allocate_device();
d9105c2b MV	327	if (!ucb->ts_idev) {
f40219bf	328	error = -ENOMEM;
d9105c2b	329	goto err;
f40219bf NP	330	}
f40219bf NP	331
fb141597 MV	332	/* Only in case the IRQ line wasn't supplied, try detecting it */
fb141597 MV	333	if (ucb->irq < 0) {
bd100e2c	334	error = ucb1400_ts_detect_irq(ucb, pdev);
fb141597	335	if (error) {
bd100e2c	336	dev_err(&pdev->dev, "IRQ probe failed\n");
fb141597 MV	337	goto err_free_devs;
fb141597 MV	338	}
f40219bf	339	}
bd100e2c	340	dev_dbg(&pdev->dev, "found IRQ %d\n", ucb->irq);
f40219bf	341
d9105c2b MV	342	init_waitqueue_head(&ucb->ts_wait);
d9105c2b MV	343
d9105c2b	344	input_set_drvdata(ucb->ts_idev, ucb);
40b9b0b8	345
c899afed	346	ucb->ts_idev->dev.parent = &pdev->dev;
d9105c2b MV	347	ucb->ts_idev->name = "UCB1400 touchscreen interface";
	348	ucb->ts_idev->id.vendor = ucb1400_reg_read(ucb->ac97,
	349	AC97_VENDOR_ID1);
	350	ucb->ts_idev->id.product = ucb->id;
	351	ucb->ts_idev->open = ucb1400_ts_open;
	352	ucb->ts_idev->close = ucb1400_ts_close;
cd2d64b1 MR	353	ucb->ts_idev->evbit[0] = BIT_MASK(EV_ABS) \| BIT_MASK(EV_KEY);
cd2d64b1 MR	354	ucb->ts_idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
f40219bf	355
1700f5fd MV	356	/*
	357	* Enable ADC filter to prevent horrible jitter on Colibri.
	358	* This also further reduces jitter on boards where ADCSYNC
	359	* pin is connected.
	360	*/
	361	fcsr = ucb1400_reg_read(ucb->ac97, UCB_FCSR);
	362	ucb1400_reg_write(ucb->ac97, UCB_FCSR, fcsr \| UCB_FCSR_AVE);
	363
d9105c2b	364	ucb1400_adc_enable(ucb->ac97);
f40219bf NP	365	x_res = ucb1400_ts_read_xres(ucb);
f40219bf NP	366	y_res = ucb1400_ts_read_yres(ucb);
d9105c2b	367	ucb1400_adc_disable(ucb->ac97);
bd100e2c	368	dev_dbg(&pdev->dev, "x/y = %d/%d\n", x_res, y_res);
f40219bf	369
d9105c2b MV	370	input_set_abs_params(ucb->ts_idev, ABS_X, 0, x_res, 0, 0);
	371	input_set_abs_params(ucb->ts_idev, ABS_Y, 0, y_res, 0, 0);
	372	input_set_abs_params(ucb->ts_idev, ABS_PRESSURE, 0, 0, 0, 0);
f40219bf	373
c899afed DT	374	ucb1400_ts_stop(ucb);
	375
	376	error = request_threaded_irq(ucb->irq, NULL, ucb1400_irq,
	377	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
	378	"UCB1400", ucb);
	379	if (error) {
bd100e2c DT	380	dev_err(&pdev->dev,
bd100e2c DT	381	"unable to grab irq%d: %d\n", ucb->irq, error);
c899afed DT	382	goto err_free_devs;
	383	}
	384
d9105c2b	385	error = input_register_device(ucb->ts_idev);
f40219bf NP	386	if (error)
	387	goto err_free_irq;
	388
f40219bf NP	389	return 0;
f40219bf NP	390
d9105c2b	391	err_free_irq:
f40219bf	392	free_irq(ucb->irq, ucb);
d9105c2b MV	393	err_free_devs:
	394	input_free_device(ucb->ts_idev);
	395	err:
f40219bf NP	396	return error;
	397	}
	398
e2619cf7	399	static int ucb1400_ts_remove(struct platform_device *pdev)
f40219bf	400	{
c838cb3d	401	struct ucb1400_ts *ucb = dev_get_platdata(&pdev->dev);
f40219bf NP	402
	403	free_irq(ucb->irq, ucb);
	404	input_unregister_device(ucb->ts_idev);
9fea9291	405
f40219bf NP	406	return 0;
	407	}
	408
02b6a58b	409	static int __maybe_unused ucb1400_ts_suspend(struct device *dev)
c899afed	410	{
c838cb3d	411	struct ucb1400_ts *ucb = dev_get_platdata(dev);
c899afed DT	412	struct input_dev *idev = ucb->ts_idev;
	413
	414	mutex_lock(&idev->mutex);
	415
	416	if (idev->users)
39467fc1	417	ucb1400_ts_stop(ucb);
c899afed DT	418
	419	mutex_unlock(&idev->mutex);
	420	return 0;
	421	}
	422
02b6a58b	423	static int __maybe_unused ucb1400_ts_resume(struct device *dev)
d9105c2b	424	{
c838cb3d	425	struct ucb1400_ts *ucb = dev_get_platdata(dev);
c899afed	426	struct input_dev *idev = ucb->ts_idev;
d9105c2b	427
c899afed DT	428	mutex_lock(&idev->mutex);
	429
	430	if (idev->users)
39467fc1	431	ucb1400_ts_start(ucb);
c899afed DT	432
c899afed DT	433	mutex_unlock(&idev->mutex);
d9105c2b MV	434	return 0;
d9105c2b MV	435	}
d9105c2b	436
c899afed DT	437	static SIMPLE_DEV_PM_OPS(ucb1400_ts_pm_ops,
c899afed DT	438	ucb1400_ts_suspend, ucb1400_ts_resume);
3db8a537	439
d9105c2b MV	440	static struct platform_driver ucb1400_ts_driver = {
d9105c2b MV	441	.probe = ucb1400_ts_probe,
1cb0aa88	442	.remove = ucb1400_ts_remove,
d9105c2b MV	443	.driver = {
d9105c2b MV	444	.name = "ucb1400_ts",
3db8a537	445	.pm = &ucb1400_ts_pm_ops,
d9105c2b	446	},
f40219bf	447	};
cdcc96e2	448	module_platform_driver(ucb1400_ts_driver);
f40219bf	449
b5b16c52 CB	450	module_param(adcsync, bool, 0444);
	451	MODULE_PARM_DESC(adcsync, "Synchronize touch readings with ADCSYNC pin.");
	452
	453	module_param(ts_delay, int, 0444);
d9105c2b MV	454	MODULE_PARM_DESC(ts_delay, "Delay between panel setup and"
d9105c2b MV	455	" position read. Default = 55us.");
b5b16c52 CB	456
	457	module_param(ts_delay_pressure, int, 0444);
	458	MODULE_PARM_DESC(ts_delay_pressure,
d9105c2b MV	459	"delay between panel setup and pressure read."
d9105c2b MV	460	" Default = 0us.");
f40219bf	461
f40219bf NP	462	MODULE_DESCRIPTION("Philips UCB1400 touchscreen driver");
f40219bf NP	463	MODULE_LICENSE("GPL");