Commit f0933a60 authored by Jeff Lance's avatar Jeff Lance Committed by Lee Jones
Browse files

mfd: ti_am335x_tscadc: Update logic in CTRL register for 5-wire TS 



The logic in AFE_Pen_Ctrl bitmask in the CTRL register is different for five
wire versus four or eight wire touschscreens. This patch should fix this for
five-wire touch screens. There should be no change needed here for four and
eight wire tousch screens.

Signed-off-by: default avatarJeff Lance <j-lance1@ti.com>
[bigeasy: keep the change mfd only]
Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent 92b8f3ab

drivers/mfd/ti_am335x_tscadc.c

+17 −13
Original line number Diff line number Diff line
@@ -242,18 +242,20 @@ static int ti_tscadc_probe(struct platform_device *pdev) 
	tscadc_writel(tscadc, REG_CLKDIV, tscadc->clk_div);



	/* Set the control register bits */

	ctrl = CNTRLREG_STEPCONFIGWRT |

			CNTRLREG_STEPID;

	if (tsc_wires > 0)

		ctrl |= CNTRLREG_4WIRE | CNTRLREG_TSCENB;

	ctrl = CNTRLREG_STEPCONFIGWRT |	CNTRLREG_STEPID;

	tscadc_writel(tscadc, REG_CTRL, ctrl);



	/* Set register bits for Idle Config Mode */

	if (tsc_wires > 0)

	if (tsc_wires > 0) {

		tscadc->tsc_wires = tsc_wires;

		if (tsc_wires == 5)

			ctrl |= CNTRLREG_5WIRE | CNTRLREG_TSCENB;

		else

			ctrl |= CNTRLREG_4WIRE | CNTRLREG_TSCENB;

		tscadc_idle_config(tscadc);

	}



	/* Enable the TSC module enable bit */

	ctrl = tscadc_readl(tscadc, REG_CTRL);

	ctrl |= CNTRLREG_TSCSSENB;

	tscadc_writel(tscadc, REG_CTRL, ctrl);
@@ -325,21 +327,23 @@ static int tscadc_suspend(struct device *dev) 
static int tscadc_resume(struct device *dev)

{

	struct ti_tscadc_dev	*tscadc_dev = dev_get_drvdata(dev);

	unsigned int restore, ctrl;

	u32 ctrl;



	pm_runtime_get_sync(dev);



	/* context restore */

	ctrl = CNTRLREG_STEPCONFIGWRT |	CNTRLREG_STEPID;

	if (tscadc_dev->tsc_cell != -1)

		ctrl |= CNTRLREG_TSCENB | CNTRLREG_4WIRE;

	tscadc_writel(tscadc_dev, REG_CTRL, ctrl);



	if (tscadc_dev->tsc_cell != -1)

	if (tscadc_dev->tsc_cell != -1) {

		if (tscadc_dev->tsc_wires == 5)

			ctrl |= CNTRLREG_5WIRE | CNTRLREG_TSCENB;

		else

			ctrl |= CNTRLREG_4WIRE | CNTRLREG_TSCENB;

		tscadc_idle_config(tscadc_dev);

	restore = tscadc_readl(tscadc_dev, REG_CTRL);

	tscadc_writel(tscadc_dev, REG_CTRL,

			(restore | CNTRLREG_TSCSSENB));

	}

	ctrl |= CNTRLREG_TSCSSENB;

	tscadc_writel(tscadc_dev, REG_CTRL, ctrl);



	tscadc_writel(tscadc_dev, REG_CLKDIV, tscadc_dev->clk_div);

include/linux/mfd/ti_am335x_tscadc.h

+1 −0
Original line number Diff line number Diff line
@@ -155,6 +155,7 @@ struct ti_tscadc_dev { 
	void __iomem *tscadc_base;

	int irq;

	int used_cells;	/* 1-2 */

	int tsc_wires;

	int tsc_cell;	/* -1 if not used */

	int adc_cell;	/* -1 if not used */

	struct mfd_cell cells[TSCADC_CELLS];

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