[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/init.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 = pdev->dev.platform_data;
	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 = pdev->dev.platform_data;

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

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int ucb1400_ts_suspend(struct device *dev)
{
	struct ucb1400_ts *ucb = dev->platform_data;
	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 int ucb1400_ts_resume(struct device *dev)
{
	struct ucb1400_ts *ucb = dev->platform_data;
	struct input_dev *idev = ucb->ts_idev;

	mutex_lock(&idev->mutex);

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

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

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",
		.owner	= THIS_MODULE,
		.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/init.h>
f40219bf	23	#include <linux/delay.h>
c899afed DT	24	#include <linux/sched.h>
c899afed DT	25	#include <linux/wait.h>
f40219bf NP	26	#include <linux/input.h>
	27	#include <linux/device.h>
	28	#include <linux/interrupt.h>
d9105c2b	29	#include <linux/ucb1400.h>
f40219bf	30
c899afed DT	31	#define UCB1400_TS_POLL_PERIOD 10 /* ms */
c899afed DT	32
90ab5ee9	33	static bool adcsync;
b5b16c52 CB	34	static int ts_delay = 55; /* us */
b5b16c52 CB	35	static int ts_delay_pressure; /* us */
f40219bf	36
f40219bf	37	/* Switch to interrupt mode. */
c899afed	38	static void ucb1400_ts_mode_int(struct ucb1400_ts *ucb)
f40219bf	39	{
c899afed	40	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
f40219bf NP	41	UCB_TS_CR_TSMX_POW \| UCB_TS_CR_TSPX_POW \|
	42	UCB_TS_CR_TSMY_GND \| UCB_TS_CR_TSPY_GND \|
	43	UCB_TS_CR_MODE_INT);
	44	}
	45
	46	/*
	47	* Switch to pressure mode, and read pressure. We don't need to wait
	48	* here, since both plates are being driven.
	49	*/
75072323	50	static unsigned int ucb1400_ts_read_pressure(struct ucb1400_ts *ucb)
f40219bf	51	{
d9105c2b	52	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
f40219bf NP	53	UCB_TS_CR_TSMX_POW \| UCB_TS_CR_TSPX_POW \|
	54	UCB_TS_CR_TSMY_GND \| UCB_TS_CR_TSPY_GND \|
	55	UCB_TS_CR_MODE_PRES \| UCB_TS_CR_BIAS_ENA);
c899afed	56
b5b16c52	57	udelay(ts_delay_pressure);
c899afed	58
d9105c2b	59	return ucb1400_adc_read(ucb->ac97, UCB_ADC_INP_TSPY, adcsync);
f40219bf NP	60	}
	61
	62	/*
	63	* Switch to X position mode and measure Y plate. We switch the plate
	64	* configuration in pressure mode, then switch to position mode. This
	65	* gives a faster response time. Even so, we need to wait about 55us
	66	* for things to stabilise.
	67	*/
75072323	68	static unsigned int ucb1400_ts_read_xpos(struct ucb1400_ts *ucb)
f40219bf	69	{
d9105c2b	70	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
f40219bf NP	71	UCB_TS_CR_TSMX_GND \| UCB_TS_CR_TSPX_POW \|
f40219bf NP	72	UCB_TS_CR_MODE_PRES \| UCB_TS_CR_BIAS_ENA);
d9105c2b	73	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
f40219bf NP	74	UCB_TS_CR_TSMX_GND \| UCB_TS_CR_TSPX_POW \|
f40219bf NP	75	UCB_TS_CR_MODE_PRES \| UCB_TS_CR_BIAS_ENA);
d9105c2b	76	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
f40219bf NP	77	UCB_TS_CR_TSMX_GND \| UCB_TS_CR_TSPX_POW \|
	78	UCB_TS_CR_MODE_POS \| UCB_TS_CR_BIAS_ENA);
	79
b5b16c52	80	udelay(ts_delay);
f40219bf	81
d9105c2b	82	return ucb1400_adc_read(ucb->ac97, UCB_ADC_INP_TSPY, adcsync);
f40219bf NP	83	}
	84
	85	/*
	86	* Switch to Y position mode and measure X plate. We switch the plate
	87	* configuration in pressure mode, then switch to position mode. This
	88	* gives a faster response time. Even so, we need to wait about 55us
	89	* for things to stabilise.
	90	*/
75072323	91	static int ucb1400_ts_read_ypos(struct ucb1400_ts *ucb)
f40219bf	92	{
d9105c2b	93	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
f40219bf NP	94	UCB_TS_CR_TSMY_GND \| UCB_TS_CR_TSPY_POW \|
f40219bf NP	95	UCB_TS_CR_MODE_PRES \| UCB_TS_CR_BIAS_ENA);
d9105c2b	96	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
f40219bf NP	97	UCB_TS_CR_TSMY_GND \| UCB_TS_CR_TSPY_POW \|
f40219bf NP	98	UCB_TS_CR_MODE_PRES \| UCB_TS_CR_BIAS_ENA);
d9105c2b	99	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
f40219bf NP	100	UCB_TS_CR_TSMY_GND \| UCB_TS_CR_TSPY_POW \|
	101	UCB_TS_CR_MODE_POS \| UCB_TS_CR_BIAS_ENA);
	102
b5b16c52	103	udelay(ts_delay);
f40219bf	104
d9105c2b	105	return ucb1400_adc_read(ucb->ac97, UCB_ADC_INP_TSPX, adcsync);
f40219bf NP	106	}
	107
	108	/*
	109	* Switch to X plate resistance mode. Set MX to ground, PX to
	110	* supply. Measure current.
	111	*/
75072323	112	static unsigned int ucb1400_ts_read_xres(struct ucb1400_ts *ucb)
f40219bf	113	{
d9105c2b	114	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
f40219bf NP	115	UCB_TS_CR_TSMX_GND \| UCB_TS_CR_TSPX_POW \|
f40219bf NP	116	UCB_TS_CR_MODE_PRES \| UCB_TS_CR_BIAS_ENA);
d9105c2b	117	return ucb1400_adc_read(ucb->ac97, 0, adcsync);
f40219bf NP	118	}
	119
	120	/*
	121	* Switch to Y plate resistance mode. Set MY to ground, PY to
	122	* supply. Measure current.
	123	*/
75072323	124	static unsigned int ucb1400_ts_read_yres(struct ucb1400_ts *ucb)
f40219bf	125	{
d9105c2b	126	ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
f40219bf NP	127	UCB_TS_CR_TSMY_GND \| UCB_TS_CR_TSPY_POW \|
f40219bf NP	128	UCB_TS_CR_MODE_PRES \| UCB_TS_CR_BIAS_ENA);
d9105c2b	129	return ucb1400_adc_read(ucb->ac97, 0, adcsync);
f40219bf NP	130	}
f40219bf NP	131
c899afed	132	static int ucb1400_ts_pen_up(struct ucb1400_ts *ucb)
f40219bf	133	{
c899afed	134	unsigned short val = ucb1400_reg_read(ucb->ac97, UCB_TS_CR);
f9c22736	135
d9105c2b	136	return val & (UCB_TS_CR_TSPX_LOW \| UCB_TS_CR_TSMX_LOW);
f40219bf NP	137	}
f40219bf NP	138
c899afed	139	static void ucb1400_ts_irq_enable(struct ucb1400_ts *ucb)
f40219bf	140	{
c899afed DT	141	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, UCB_IE_TSPX);
	142	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);
	143	ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, UCB_IE_TSPX);
f40219bf NP	144	}
f40219bf NP	145
c899afed	146	static void ucb1400_ts_irq_disable(struct ucb1400_ts *ucb)
f40219bf	147	{
c899afed	148	ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, 0);
f40219bf NP	149	}
f40219bf NP	150
c899afed	151	static void ucb1400_ts_report_event(struct input_dev *idev, u16 pressure, u16 x, u16 y)
f40219bf NP	152	{
	153	input_report_abs(idev, ABS_X, x);
	154	input_report_abs(idev, ABS_Y, y);
	155	input_report_abs(idev, ABS_PRESSURE, pressure);
cd2d64b1	156	input_report_key(idev, BTN_TOUCH, 1);
f40219bf NP	157	input_sync(idev);
	158	}
	159
	160	static void ucb1400_ts_event_release(struct input_dev *idev)
	161	{
	162	input_report_abs(idev, ABS_PRESSURE, 0);
cd2d64b1	163	input_report_key(idev, BTN_TOUCH, 0);
f40219bf NP	164	input_sync(idev);
	165	}
	166
c899afed	167	static void ucb1400_clear_pending_irq(struct ucb1400_ts *ucb)
f40219bf NP	168	{
	169	unsigned int isr;
	170
d9105c2b MV	171	isr = ucb1400_reg_read(ucb->ac97, UCB_IE_STATUS);
	172	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, isr);
	173	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);
f40219bf	174
9b2fb2da	175	if (isr & UCB_IE_TSPX)
c899afed	176	ucb1400_ts_irq_disable(ucb);
9b2fb2da	177	else
c899afed DT	178	dev_dbg(&ucb->ts_idev->dev,
c899afed DT	179	"ucb1400: unexpected IE_STATUS = %#x\n", isr);
f40219bf NP	180	}
f40219bf NP	181
c899afed DT	182	/*
	183	* A restriction with interrupts exists when using the ucb1400, as
	184	* the codec read/write routines may sleep while waiting for codec
	185	* access completion and uses semaphores for access control to the
	186	* AC97 bus. Therefore the driver is forced to use threaded interrupt
	187	* handler.
	188	*/
	189	static irqreturn_t ucb1400_irq(int irqnr, void *devid)
f40219bf	190	{
c899afed DT	191	struct ucb1400_ts *ucb = devid;
	192	unsigned int x, y, p;
	193	bool penup;
f40219bf	194
c899afed DT	195	if (unlikely(irqnr != ucb->irq))
c899afed DT	196	return IRQ_NONE;
f40219bf	197
c899afed	198	ucb1400_clear_pending_irq(ucb);
f40219bf	199
c899afed DT	200	/* Start with a small delay before checking pendown state */
c899afed DT	201	msleep(UCB1400_TS_POLL_PERIOD);
f40219bf	202
c899afed	203	while (!ucb->stopped && !(penup = ucb1400_ts_pen_up(ucb))) {
f40219bf	204
d9105c2b	205	ucb1400_adc_enable(ucb->ac97);
f40219bf NP	206	x = ucb1400_ts_read_xpos(ucb);
	207	y = ucb1400_ts_read_ypos(ucb);
	208	p = ucb1400_ts_read_pressure(ucb);
d9105c2b	209	ucb1400_adc_disable(ucb->ac97);
f40219bf	210
c899afed	211	ucb1400_ts_report_event(ucb->ts_idev, p, x, y);
f40219bf	212
c899afed DT	213	wait_event_timeout(ucb->ts_wait, ucb->stopped,
c899afed DT	214	msecs_to_jiffies(UCB1400_TS_POLL_PERIOD));
f40219bf NP	215	}
f40219bf NP	216
c899afed	217	ucb1400_ts_event_release(ucb->ts_idev);
f40219bf	218
c899afed DT	219	if (!ucb->stopped) {
	220	/* Switch back to interrupt mode. */
	221	ucb1400_ts_mode_int(ucb);
	222	ucb1400_ts_irq_enable(ucb);
	223	}
	224
	225	return IRQ_HANDLED;
f40219bf NP	226	}
f40219bf NP	227
c899afed	228	static void ucb1400_ts_stop(struct ucb1400_ts *ucb)
f40219bf	229	{
c899afed DT	230	/* Signal IRQ thread to stop polling and disable the handler. */
	231	ucb->stopped = true;
	232	mb();
	233	wake_up(&ucb->ts_wait);
	234	disable_irq(ucb->irq);
f40219bf	235
c899afed DT	236	ucb1400_ts_irq_disable(ucb);
	237	ucb1400_reg_write(ucb->ac97, UCB_TS_CR, 0);
	238	}
	239
	240	/* Must be called with ts->lock held */
	241	static void ucb1400_ts_start(struct ucb1400_ts *ucb)
	242	{
	243	/* Tell IRQ thread that it may poll the device. */
	244	ucb->stopped = false;
	245	mb();
	246
	247	ucb1400_ts_mode_int(ucb);
	248	ucb1400_ts_irq_enable(ucb);
	249
	250	enable_irq(ucb->irq);
f40219bf NP	251	}
	252
	253	static int ucb1400_ts_open(struct input_dev *idev)
	254	{
d9105c2b	255	struct ucb1400_ts *ucb = input_get_drvdata(idev);
f40219bf	256
c899afed	257	ucb1400_ts_start(ucb);
f40219bf	258
c899afed	259	return 0;
f40219bf NP	260	}
	261
	262	static void ucb1400_ts_close(struct input_dev *idev)
	263	{
d9105c2b	264	struct ucb1400_ts *ucb = input_get_drvdata(idev);
f40219bf	265
c899afed	266	ucb1400_ts_stop(ucb);
f40219bf	267	}
f40219bf NP	268
	269	#ifndef NO_IRQ
	270	#define NO_IRQ 0
	271	#endif
	272
	273	/*
	274	* Try to probe our interrupt, rather than relying on lots of
	275	* hard-coded machine dependencies.
	276	*/
5298cc4c	277	static int ucb1400_ts_detect_irq(struct ucb1400_ts *ucb,
bd100e2c	278	struct platform_device *pdev)
f40219bf NP	279	{
	280	unsigned long mask, timeout;
	281
	282	mask = probe_irq_on();
f40219bf NP	283
f40219bf NP	284	/* Enable the ADC interrupt. */
d9105c2b MV	285	ucb1400_reg_write(ucb->ac97, UCB_IE_RIS, UCB_IE_ADC);
	286	ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, UCB_IE_ADC);
	287	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0xffff);
	288	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);
f40219bf NP	289
f40219bf NP	290	/* Cause an ADC interrupt. */
d9105c2b MV	291	ucb1400_reg_write(ucb->ac97, UCB_ADC_CR, UCB_ADC_ENA);
d9105c2b MV	292	ucb1400_reg_write(ucb->ac97, UCB_ADC_CR, UCB_ADC_ENA \| UCB_ADC_START);
f40219bf NP	293
	294	/* Wait for the conversion to complete. */
	295	timeout = jiffies + HZ/2;
d9105c2b MV	296	while (!(ucb1400_reg_read(ucb->ac97, UCB_ADC_DATA) &
d9105c2b MV	297	UCB_ADC_DAT_VALID)) {
f40219bf NP	298	cpu_relax();
f40219bf NP	299	if (time_after(jiffies, timeout)) {
bd100e2c	300	dev_err(&pdev->dev, "timed out in IRQ probe\n");
f40219bf NP	301	probe_irq_off(mask);
	302	return -ENODEV;
	303	}
	304	}
d9105c2b	305	ucb1400_reg_write(ucb->ac97, UCB_ADC_CR, 0);
f40219bf NP	306
f40219bf NP	307	/* Disable and clear interrupt. */
d9105c2b MV	308	ucb1400_reg_write(ucb->ac97, UCB_IE_RIS, 0);
	309	ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, 0);
	310	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0xffff);
	311	ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);
f40219bf NP	312
	313	/* Read triggered interrupt. */
	314	ucb->irq = probe_irq_off(mask);
	315	if (ucb->irq < 0 \|\| ucb->irq == NO_IRQ)
	316	return -ENODEV;
	317
	318	return 0;
	319	}
	320
5298cc4c	321	static int ucb1400_ts_probe(struct platform_device *pdev)
f40219bf	322	{
c899afed	323	struct ucb1400_ts *ucb = pdev->dev.platform_data;
d9105c2b	324	int error, x_res, y_res;
1700f5fd	325	u16 fcsr;
f40219bf	326
d9105c2b MV	327	ucb->ts_idev = input_allocate_device();
d9105c2b MV	328	if (!ucb->ts_idev) {
f40219bf	329	error = -ENOMEM;
d9105c2b	330	goto err;
f40219bf NP	331	}
f40219bf NP	332
fb141597 MV	333	/* Only in case the IRQ line wasn't supplied, try detecting it */
fb141597 MV	334	if (ucb->irq < 0) {
bd100e2c	335	error = ucb1400_ts_detect_irq(ucb, pdev);
fb141597	336	if (error) {
bd100e2c	337	dev_err(&pdev->dev, "IRQ probe failed\n");
fb141597 MV	338	goto err_free_devs;
fb141597 MV	339	}
f40219bf	340	}
bd100e2c	341	dev_dbg(&pdev->dev, "found IRQ %d\n", ucb->irq);
f40219bf	342
d9105c2b MV	343	init_waitqueue_head(&ucb->ts_wait);
d9105c2b MV	344
d9105c2b	345	input_set_drvdata(ucb->ts_idev, ucb);
40b9b0b8	346
c899afed	347	ucb->ts_idev->dev.parent = &pdev->dev;
d9105c2b MV	348	ucb->ts_idev->name = "UCB1400 touchscreen interface";
	349	ucb->ts_idev->id.vendor = ucb1400_reg_read(ucb->ac97,
	350	AC97_VENDOR_ID1);
	351	ucb->ts_idev->id.product = ucb->id;
	352	ucb->ts_idev->open = ucb1400_ts_open;
	353	ucb->ts_idev->close = ucb1400_ts_close;
cd2d64b1 MR	354	ucb->ts_idev->evbit[0] = BIT_MASK(EV_ABS) \| BIT_MASK(EV_KEY);
cd2d64b1 MR	355	ucb->ts_idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
f40219bf	356
1700f5fd MV	357	/*
	358	* Enable ADC filter to prevent horrible jitter on Colibri.
	359	* This also further reduces jitter on boards where ADCSYNC
	360	* pin is connected.
	361	*/
	362	fcsr = ucb1400_reg_read(ucb->ac97, UCB_FCSR);
	363	ucb1400_reg_write(ucb->ac97, UCB_FCSR, fcsr \| UCB_FCSR_AVE);
	364
d9105c2b	365	ucb1400_adc_enable(ucb->ac97);
f40219bf NP	366	x_res = ucb1400_ts_read_xres(ucb);
f40219bf NP	367	y_res = ucb1400_ts_read_yres(ucb);
d9105c2b	368	ucb1400_adc_disable(ucb->ac97);
bd100e2c	369	dev_dbg(&pdev->dev, "x/y = %d/%d\n", x_res, y_res);
f40219bf	370
d9105c2b MV	371	input_set_abs_params(ucb->ts_idev, ABS_X, 0, x_res, 0, 0);
	372	input_set_abs_params(ucb->ts_idev, ABS_Y, 0, y_res, 0, 0);
	373	input_set_abs_params(ucb->ts_idev, ABS_PRESSURE, 0, 0, 0, 0);
f40219bf	374
c899afed DT	375	ucb1400_ts_stop(ucb);
	376
	377	error = request_threaded_irq(ucb->irq, NULL, ucb1400_irq,
	378	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
	379	"UCB1400", ucb);
	380	if (error) {
bd100e2c DT	381	dev_err(&pdev->dev,
bd100e2c DT	382	"unable to grab irq%d: %d\n", ucb->irq, error);
c899afed DT	383	goto err_free_devs;
	384	}
	385
d9105c2b	386	error = input_register_device(ucb->ts_idev);
f40219bf NP	387	if (error)
	388	goto err_free_irq;
	389
f40219bf NP	390	return 0;
f40219bf NP	391
d9105c2b	392	err_free_irq:
f40219bf	393	free_irq(ucb->irq, ucb);
d9105c2b MV	394	err_free_devs:
	395	input_free_device(ucb->ts_idev);
	396	err:
f40219bf NP	397	return error;
	398	}
	399
e2619cf7	400	static int ucb1400_ts_remove(struct platform_device *pdev)
f40219bf	401	{
c899afed	402	struct ucb1400_ts *ucb = pdev->dev.platform_data;
f40219bf NP	403
	404	free_irq(ucb->irq, ucb);
	405	input_unregister_device(ucb->ts_idev);
9fea9291	406
f40219bf NP	407	return 0;
	408	}
	409
3db8a537	410	#ifdef CONFIG_PM_SLEEP
c899afed DT	411	static int ucb1400_ts_suspend(struct device *dev)
	412	{
	413	struct ucb1400_ts *ucb = dev->platform_data;
	414	struct input_dev *idev = ucb->ts_idev;
	415
	416	mutex_lock(&idev->mutex);
	417
	418	if (idev->users)
	419	ucb1400_ts_start(ucb);
	420
	421	mutex_unlock(&idev->mutex);
	422	return 0;
	423	}
	424
3db8a537	425	static int ucb1400_ts_resume(struct device *dev)
d9105c2b	426	{
3db8a537	427	struct ucb1400_ts *ucb = dev->platform_data;
c899afed	428	struct input_dev *idev = ucb->ts_idev;
d9105c2b	429
c899afed DT	430	mutex_lock(&idev->mutex);
	431
	432	if (idev->users)
	433	ucb1400_ts_stop(ucb);
	434
	435	mutex_unlock(&idev->mutex);
d9105c2b MV	436	return 0;
d9105c2b MV	437	}
d9105c2b MV	438	#endif
d9105c2b MV	439
c899afed DT	440	static SIMPLE_DEV_PM_OPS(ucb1400_ts_pm_ops,
c899afed DT	441	ucb1400_ts_suspend, ucb1400_ts_resume);
3db8a537	442
d9105c2b MV	443	static struct platform_driver ucb1400_ts_driver = {
d9105c2b MV	444	.probe = ucb1400_ts_probe,
1cb0aa88	445	.remove = ucb1400_ts_remove,
d9105c2b MV	446	.driver = {
d9105c2b MV	447	.name = "ucb1400_ts",
8028e938	448	.owner = THIS_MODULE,
3db8a537	449	.pm = &ucb1400_ts_pm_ops,
d9105c2b	450	},
f40219bf	451	};
cdcc96e2	452	module_platform_driver(ucb1400_ts_driver);
f40219bf	453
b5b16c52 CB	454	module_param(adcsync, bool, 0444);
	455	MODULE_PARM_DESC(adcsync, "Synchronize touch readings with ADCSYNC pin.");
	456
	457	module_param(ts_delay, int, 0444);
d9105c2b MV	458	MODULE_PARM_DESC(ts_delay, "Delay between panel setup and"
d9105c2b MV	459	" position read. Default = 55us.");
b5b16c52 CB	460
	461	module_param(ts_delay_pressure, int, 0444);
	462	MODULE_PARM_DESC(ts_delay_pressure,
d9105c2b MV	463	"delay between panel setup and pressure read."
d9105c2b MV	464	" Default = 0us.");
f40219bf	465
f40219bf NP	466	MODULE_DESCRIPTION("Philips UCB1400 touchscreen driver");
f40219bf NP	467	MODULE_LICENSE("GPL");