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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: Jeff Lance <j-lance1@ti.com>
[bigeasy: keep the change mfd only]
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Jeff Lance 2014-09-04 19:01:57 +02:00 committed by Lee Jones
parent 92b8f3abb8
commit f0933a60d1
2 changed files with 18 additions and 13 deletions
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30
drivers/mfd/ti_am335x_tscadc.c
View File

@ -242,18 +242,20 @@ static int ti_tscadc_probe(struct platform_device *pdev)
tscadc_writel(tscadc, REG_CLKDIV, tscadc->clk_div); tscadc_writel(tscadc, REG_CLKDIV, tscadc->clk_div);
/* Set the control register bits */ /* Set the control register bits */
ctrl = CNTRLREG_STEPCONFIGWRT | ctrl = CNTRLREG_STEPCONFIGWRT | CNTRLREG_STEPID;
CNTRLREG_STEPID;
if (tsc_wires > 0)
ctrl |= CNTRLREG_4WIRE | CNTRLREG_TSCENB;
tscadc_writel(tscadc, REG_CTRL, ctrl); tscadc_writel(tscadc, REG_CTRL, ctrl);
/* Set register bits for Idle Config Mode */ /* 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); tscadc_idle_config(tscadc);
}
/* Enable the TSC module enable bit */ /* Enable the TSC module enable bit */
ctrl = tscadc_readl(tscadc, REG_CTRL);
ctrl |= CNTRLREG_TSCSSENB; ctrl |= CNTRLREG_TSCSSENB;
tscadc_writel(tscadc, REG_CTRL, ctrl); tscadc_writel(tscadc, REG_CTRL, ctrl);
@ -325,21 +327,23 @@ static int tscadc_suspend(struct device *dev)
static int tscadc_resume(struct device *dev) static int tscadc_resume(struct device *dev)
{ {
struct ti_tscadc_dev *tscadc_dev = dev_get_drvdata(dev); struct ti_tscadc_dev *tscadc_dev = dev_get_drvdata(dev);
unsigned int restore, ctrl; u32 ctrl;
pm_runtime_get_sync(dev); pm_runtime_get_sync(dev);
/* context restore */ /* context restore */
ctrl = CNTRLREG_STEPCONFIGWRT | CNTRLREG_STEPID; ctrl = CNTRLREG_STEPCONFIGWRT | CNTRLREG_STEPID;
if (tscadc_dev->tsc_cell != -1)
ctrl |= CNTRLREG_TSCENB | CNTRLREG_4WIRE;
tscadc_writel(tscadc_dev, REG_CTRL, ctrl); 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); tscadc_idle_config(tscadc_dev);
restore = tscadc_readl(tscadc_dev, REG_CTRL); }
tscadc_writel(tscadc_dev, REG_CTRL, ctrl |= CNTRLREG_TSCSSENB;
(restore | CNTRLREG_TSCSSENB)); tscadc_writel(tscadc_dev, REG_CTRL, ctrl);
tscadc_writel(tscadc_dev, REG_CLKDIV, tscadc_dev->clk_div); tscadc_writel(tscadc_dev, REG_CLKDIV, tscadc_dev->clk_div);

1
include/linux/mfd/ti_am335x_tscadc.h
View File

@ -155,6 +155,7 @@ struct ti_tscadc_dev {
void __iomem *tscadc_base; void __iomem *tscadc_base;
int irq; int irq;
int used_cells; /* 1-2 */ int used_cells; /* 1-2 */
int tsc_wires;
int tsc_cell; /* -1 if not used */ int tsc_cell; /* -1 if not used */
int adc_cell; /* -1 if not used */ int adc_cell; /* -1 if not used */
struct mfd_cell cells[TSCADC_CELLS]; struct mfd_cell cells[TSCADC_CELLS];