Re: [PATCH v4 5/5] MFD: ti_tscadc: add suspend/resume functionality

[Shubhrajyoti]

On Wednesday 26 September 2012 10:50 AM, Patil, Rachna wrote:
> This patch adds support for suspend/resume of
> TSC/ADC MFDevice.
this should be merged with the patch adding support else
we may end up in a case where patch a does the runtime calls
and the call back  handlers added later.
>
> Signed-off-by: Patil, Rachna <rachna@xxxxxx>
> ---
> Changes in v2:
> 	Added this patch newly in this patch series.
>
> Changes in v3:
> 	No changes.
>
> Changes in v4:
> 	Replaced suspend/resume callbacks with dev_pm_ops.
>
>  drivers/iio/adc/ti_am335x_adc.c           |   42 +++++++++++++++++++++++++++++
>  drivers/input/touchscreen/ti_am335x_tsc.c |   42 +++++++++++++++++++++++++++++
>  drivers/mfd/ti_am335x_tscadc.c            |   41 +++++++++++++++++++++++++++-
>  include/linux/mfd/ti_am335x_tscadc.h      |    3 ++
>  4 files changed, 127 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
> index 9e1b3ac..b16f944 100644
> --- a/drivers/iio/adc/ti_am335x_adc.c
> +++ b/drivers/iio/adc/ti_am335x_adc.c
> @@ -200,10 +200,52 @@ static int __devexit tiadc_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_PM
> +static int tiadc_suspend(struct device *dev)
> +{
> +	struct iio_dev *indio_dev = dev_get_drvdata(dev);
> +	struct tiadc_device *adc_dev = iio_priv(indio_dev);
> +	struct ti_tscadc_dev *tscadc_dev = dev->platform_data;
> +	unsigned int idle;
> +
> +	if (!device_may_wakeup(tscadc_dev->dev)) {
> +		idle = adc_readl(adc_dev, REG_CTRL);
> +		idle &= ~(CNTRLREG_TSCSSENB);
> +		adc_writel(adc_dev, REG_CTRL, (idle |
> +				CNTRLREG_POWERDOWN));
> +	}
> +	return 0;
> +}
> +
> +static int tiadc_resume(struct device *dev)
> +{
> +	struct iio_dev *indio_dev = dev_get_drvdata(dev);
> +	struct tiadc_device *adc_dev = iio_priv(indio_dev);
> +	unsigned int restore;
> +
> +	/* Make sure ADC is powered up */
> +	restore = adc_readl(adc_dev, REG_CTRL);
> +	restore &= ~(CNTRLREG_POWERDOWN);
> +	adc_writel(adc_dev, REG_CTRL, restore);
> +
> +	adc_step_config(adc_dev);
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops tiadc_pm_ops = {
> +	.suspend = tiadc_suspend,
> +	.resume = tiadc_resume,
> +};
> +#define TIADC_PM_OPS (&tiadc_pm_ops)
> +#else
> +#define TIADC_PM_OPS NULL
> +#endif
> +
>  static struct platform_driver tiadc_driver = {
>  	.driver = {
>  		.name   = "tiadc",
>  		.owner = THIS_MODULE,
> +		.pm	= TIADC_PM_OPS,
>  	},
>  	.probe	= tiadc_probe,
>  	.remove	= __devexit_p(tiadc_remove),
> diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
> index 2d9dec1..b17dbe4 100644
> --- a/drivers/input/touchscreen/ti_am335x_tsc.c
> +++ b/drivers/input/touchscreen/ti_am335x_tsc.c
> @@ -338,12 +338,54 @@ static int __devexit tscadc_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_PM
> +static int titsc_suspend(struct device *dev)
> +{
> +	struct ti_tscadc_dev *tscadc_dev = dev->platform_data;
> +	struct tscadc *ts_dev = tscadc_dev->tsc;
> +	unsigned int idle;
> +
> +	if (device_may_wakeup(tscadc_dev->dev)) {
> +		idle = tscadc_readl(ts_dev, REG_IRQENABLE);
> +		tscadc_writel(ts_dev, REG_IRQENABLE,
> +				(idle | IRQENB_HW_PEN));
> +		tscadc_writel(ts_dev, REG_IRQWAKEUP, IRQWKUP_ENB);
> +	}
> +	return 0;
> +}
> +
> +static int titsc_resume(struct device *dev)
> +{
> +	struct ti_tscadc_dev *tscadc_dev = dev->platform_data;
> +	struct tscadc *ts_dev = tscadc_dev->tsc;
> +
> +	if (device_may_wakeup(tscadc_dev->dev)) {
> +		tscadc_writel(ts_dev, REG_IRQWAKEUP,
> +				0x00);
> +		tscadc_writel(ts_dev, REG_IRQCLR, IRQENB_HW_PEN);
> +	}
> +	tscadc_step_config(ts_dev);
> +	tscadc_writel(ts_dev, REG_FIFO0THR,
> +			ts_dev->steps_to_configure);
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops titsc_pm_ops = {
> +	.suspend = titsc_suspend,
> +	.resume  = titsc_resume,
> +};
> +#define TITSC_PM_OPS (&titsc_pm_ops)
> +#else
> +#define TITSC_PM_OPS NULL
> +#endif
> +
>  static struct platform_driver ti_tsc_driver = {
>  	.probe	= tscadc_probe,
>  	.remove	= __devexit_p(tscadc_remove),
>  	.driver	= {
>  		.name   = "tsc",
>  		.owner	= THIS_MODULE,
> +		.pm	= TITSC_PM_OPS,
>  	},
>  };
>  module_platform_driver(ti_tsc_driver);
> diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
> index 45d66e5..7e949e8 100644
> --- a/drivers/mfd/ti_am335x_tscadc.c
> +++ b/drivers/mfd/ti_am335x_tscadc.c
> @@ -170,6 +170,7 @@ static	int __devinit ti_tscadc_probe(struct platform_device *pdev)
>  	if (err < 0)
>  		goto err_disable_clk;
>  
> +	device_init_wakeup(&pdev->dev, true);
>  	platform_set_drvdata(pdev, tscadc);
>  	return 0;
>  
> @@ -203,14 +204,52 @@ static int __devexit ti_tscadc_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_PM
> +static int tscadc_suspend(struct device *dev)
> +{
> +	struct ti_tscadc_dev	*tscadc_dev = dev_get_drvdata(dev);
> +
> +	tscadc_writel(tscadc_dev, REG_SE, 0x00);
> +	pm_runtime_put_sync(dev);
> +	return 0;
> +}
> +
> +static int tscadc_resume(struct device *dev)
> +{
> +	struct ti_tscadc_dev	*tscadc_dev = dev_get_drvdata(dev);
> +	unsigned int restore, ctrl;
> +
> +	pm_runtime_get_sync(dev);
> +
> +	/* context restore */
> +	ctrl = CNTRLREG_STEPCONFIGWRT | CNTRLREG_TSCENB |
> +			CNTRLREG_STEPID | CNTRLREG_4WIRE;
> +	tscadc_writel(tscadc_dev, REG_CTRL, ctrl);
> +	tscadc_idle_config(tscadc_dev);
> +	tscadc_writel(tscadc_dev, REG_SE, STPENB_STEPENB);
> +	restore = tscadc_readl(tscadc_dev, REG_CTRL);
> +	tscadc_writel(tscadc_dev, REG_CTRL,
> +			(restore | CNTRLREG_TSCSSENB));
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops tscadc_pm_ops = {
> +	.suspend = tscadc_suspend,
> +	.resume = tscadc_resume,
> +};
> +#define TSCADC_PM_OPS (&tscadc_pm_ops)
> +#else
> +#define TSCADC_PM_OPS NULL
> +#endif
> +
>  static struct platform_driver ti_tscadc_driver = {
>  	.driver = {
>  		.name   = "ti_tscadc",
>  		.owner	= THIS_MODULE,
> +		.pm	= TSCADC_PM_OPS,
>  	},
>  	.probe	= ti_tscadc_probe,
>  	.remove	= __devexit_p(ti_tscadc_remove),
> -
>  };
>  
>  module_platform_driver(ti_tscadc_driver);
> diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h
> index bd9fe1d..c7facdc 100644
> --- a/include/linux/mfd/ti_am335x_tscadc.h
> +++ b/include/linux/mfd/ti_am335x_tscadc.h
> @@ -40,6 +40,9 @@
>  #define REG_FIFO1		0x200
>  
>  /*	Register Bitfields	*/
> +/* IRQ wakeup enable */
> +#define IRQWKUP_ENB		BIT(0)
> +
>  /* Step Enable */
>  #define STEPENB_MASK		(0x1FFFF << 0)
>  #define STEPENB(val)		((val) << 0)

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