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MFD: ti_tscadc: Disable TSC config registers in adc mode

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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 <rachna@ti.com>
Acked-by: Vaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: Zubair Lutfullah <zubair.lutfullah@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Patil, Rachna 2013-07-20 17:27:34 +01:00 committed by Samuel Ortiz
parent efe3126afc
commit b5f8b7632c
1 changed files with 11 additions and 7 deletions
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18
drivers/mfd/ti_am335x_tscadc.c
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@ -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,