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mfd: Add pdata to set mc13783-ts conversion delay

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MC13783 can be programmed to wait some clock cycles between the
touchscreen polarization and the resistance conversion. This is
needed to adjust for touchscreens with high capacitance between
plates.

Signed-off-by: Michael Thalmeier <michael.thalmeier@hale.at>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Michael Thalmeier 2012-02-20 12:18:13 +01:00 committed by Samuel Ortiz
parent 4d75dd61df
commit 1039d762d0
4 changed files with 35 additions and 5 deletions
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2
drivers/hwmon/mc13783-adc.c
View File

@ -53,7 +53,7 @@ static int mc13783_adc_read(struct device *dev,
ret = mc13xxx_adc_do_conversion(priv->mc13xxx,
MC13XXX_ADC_MODE_MULT_CHAN,
channel, sample);
channel, 0, 0, sample);
if (ret)
return ret;

11
drivers/input/touchscreen/mc13783_ts.c
View File

@ -39,6 +39,7 @@ struct mc13783_ts_priv {
struct delayed_work work;
struct workqueue_struct *workq;
unsigned int sample[4];
struct mc13xxx_ts_platform_data *touch;
};
static irqreturn_t mc13783_ts_handler(int irq, void *data)
@ -125,7 +126,9 @@ static void mc13783_ts_work(struct work_struct *work)
unsigned int channel = 12;
if (mc13xxx_adc_do_conversion(priv->mc13xxx,
mode, channel, priv->sample) == 0)
mode, channel,
priv->touch->ato, priv->touch->atox,
priv->sample) == 0)
mc13783_ts_report_sample(priv);
}
@ -179,6 +182,12 @@ static int __init mc13783_ts_probe(struct platform_device *pdev)
INIT_DELAYED_WORK(&priv->work, mc13783_ts_work);
priv->mc13xxx = dev_get_drvdata(pdev->dev.parent);
priv->idev = idev;
priv->touch = dev_get_platdata(&pdev->dev);
if (!priv->touch) {
dev_err(&pdev->dev, "missing platform data\n");
ret = -ENODEV;
goto err_free_mem;
}
/*
* We need separate workqueue because mc13783_adc_do_conversion

11
drivers/mfd/mc13xxx-core.c
View File

@ -560,6 +560,8 @@ EXPORT_SYMBOL(mc13xxx_get_flags);
#define MC13XXX_ADC1_CHAN0_SHIFT 5
#define MC13XXX_ADC1_CHAN1_SHIFT 8
#define MC13783_ADC1_ATO_SHIFT 11
#define MC13783_ADC1_ATOX (1 << 19)
struct mc13xxx_adcdone_data {
struct mc13xxx *mc13xxx;
@ -580,7 +582,8 @@ static irqreturn_t mc13xxx_handler_adcdone(int irq, void *data)
#define MC13XXX_ADC_WORKING (1 << 0)
int mc13xxx_adc_do_conversion(struct mc13xxx *mc13xxx, unsigned int mode,
unsigned int channel, unsigned int *sample)
unsigned int channel, u8 ato, bool atox,
unsigned int *sample)
{
u32 adc0, adc1, old_adc0;
int i, ret;
@ -631,6 +634,9 @@ int mc13xxx_adc_do_conversion(struct mc13xxx *mc13xxx, unsigned int mode,
return -EINVAL;
}
adc1 |= ato << MC13783_ADC1_ATO_SHIFT;
if (atox)
adc1 |= MC13783_ADC1_ATOX;
dev_dbg(&mc13xxx->spidev->dev, "%s: request irq\n", __func__);
mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_ADCDONE,
mc13xxx_handler_adcdone, __func__, &adcdone_data);
@ -813,7 +819,8 @@ err_revision:
mc13xxx_add_subdevice(mc13xxx, "%s-rtc");
if (mc13xxx->flags & MC13XXX_USE_TOUCHSCREEN)
mc13xxx_add_subdevice(mc13xxx, "%s-ts");
mc13xxx_add_subdevice_pdata(mc13xxx, "%s-ts",
&pdata->touch, sizeof(pdata->touch));
if (pdata) {
mc13xxx_add_subdevice_pdata(mc13xxx, "%s-regulator",

16
include/linux/mfd/mc13xxx.h
View File

@ -38,7 +38,8 @@ int mc13xxx_irq_ack(struct mc13xxx *mc13xxx, int irq);
int mc13xxx_get_flags(struct mc13xxx *mc13xxx);
int mc13xxx_adc_do_conversion(struct mc13xxx *mc13xxx,
unsigned int mode, unsigned int channel, unsigned int *sample);
unsigned int mode, unsigned int channel,
u8 ato, bool atox, unsigned int *sample);
#define MC13XXX_IRQ_ADCDONE 0
#define MC13XXX_IRQ_ADCBISDONE 1
@ -157,6 +158,18 @@ struct mc13xxx_buttons_platform_data {
unsigned short b3on_key;
};
struct mc13xxx_ts_platform_data {
/* Delay between Touchscreen polarization and ADC Conversion.
* Given in clock ticks of a 32 kHz clock which gives a granularity of
* about 30.5ms */
u8 ato;
#define MC13783_TS_ATO_FIRST false
#define MC13783_TS_ATO_EACH true
/* Use the ATO delay only for the first conversion or for each one */
bool atox;
};
struct mc13xxx_platform_data {
#define MC13XXX_USE_TOUCHSCREEN (1 << 0)
#define MC13XXX_USE_CODEC (1 << 1)
@ -167,6 +180,7 @@ struct mc13xxx_platform_data {
struct mc13xxx_regulator_platform_data regulators;
struct mc13xxx_leds_platform_data *leds;
struct mc13xxx_buttons_platform_data *buttons;
struct mc13xxx_ts_platform_data touch;
};
#define MC13XXX_ADC_MODE_TS 1