From b5f8b7632c4fc43d42a715a1658588acc24115a9 Mon Sep 17 00:00:00 2001 From: "Patil, Rachna" Date: Sat, 20 Jul 2013 17:27:34 +0100 Subject: MFD: ti_tscadc: Disable TSC config registers in adc mode AFE Pen Ctrl and TouchScreen transistors enabling is not required when only ADC mode is being used, so check for availability of TSC driver before accessing control register. Signed-off-by: Patil, Rachna Acked-by: Vaibhav Hiremath Signed-off-by: Zubair Lutfullah Signed-off-by: Lee Jones Signed-off-by: Samuel Ortiz --- drivers/mfd/ti_am335x_tscadc.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) (limited to 'drivers/mfd/ti_am335x_tscadc.c') diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c index e0852ecbc767..cd74d594c563 100644 --- a/drivers/mfd/ti_am335x_tscadc.c +++ b/drivers/mfd/ti_am335x_tscadc.c @@ -204,13 +204,14 @@ static int ti_tscadc_probe(struct platform_device *pdev) /* Set the control register bits */ ctrl = CNTRLREG_STEPCONFIGWRT | - CNTRLREG_TSCENB | - CNTRLREG_STEPID | - CNTRLREG_4WIRE; + CNTRLREG_STEPID; + if (tsc_wires > 0) + ctrl |= CNTRLREG_4WIRE | CNTRLREG_TSCENB; tscadc_writel(tscadc, REG_CTRL, ctrl); /* Set register bits for Idle Config Mode */ - tscadc_idle_config(tscadc); + if (tsc_wires > 0) + tscadc_idle_config(tscadc); /* Enable the TSC module enable bit */ ctrl = tscadc_readl(tscadc, REG_CTRL); @@ -290,10 +291,13 @@ static int tscadc_resume(struct device *dev) pm_runtime_get_sync(dev); /* context restore */ - ctrl = CNTRLREG_STEPCONFIGWRT | CNTRLREG_TSCENB | - CNTRLREG_STEPID | CNTRLREG_4WIRE; + ctrl = CNTRLREG_STEPCONFIGWRT | CNTRLREG_STEPID; + if (tscadc_dev->tsc_cell != -1) + ctrl |= CNTRLREG_TSCENB | CNTRLREG_4WIRE; tscadc_writel(tscadc_dev, REG_CTRL, ctrl); - tscadc_idle_config(tscadc_dev); + + if (tscadc_dev->tsc_cell != -1) + tscadc_idle_config(tscadc_dev); am335x_tsc_se_update(tscadc_dev); restore = tscadc_readl(tscadc_dev, REG_CTRL); tscadc_writel(tscadc_dev, REG_CTRL, -- cgit v1.2.3