linux-kernel - Re: [PATCH V4] regulator: DA9211 : new regulator driver

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Date:	Wed, 9 Jul 2014 17:57:56 +0900
From:	James Ban <james.ban.opensource@...semi.com>
To:	Mark Brown <broonie@...nel.org>
CC:	Liam Girdwood <lgirdwood@...il.com>,
	Support Opensource <support.opensource@...semi.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"David Dajun Chen" <david.chen@...semi.com>
Subject: Re: [PATCH V4] regulator: DA9211 : new regulator driver

> -----Original Message-----
> From: Mark Brown [mailto:broonie@...nel.org]
> Sent: Wednesday, July 09, 2014 5:39 PM
> To: Opensource [James Seong-Won Ban]
> Cc: Liam Girdwood; Support Opensource; LKML; David Dajun Chen
> Subject: Re: [PATCH V4] regulator: DA9211 : new regulator driver
> 
> On Wed, Jul 09, 2014 at 05:28:59PM +0900, James Ban wrote:
> 
> > How about below code for proper handle of interrupt?
> 
> That's fine, or you could have a return value which defaults to IRQ_NONE and
> then set it to IRQ_HANDLED when you handle a particular bit - that is more
> common since that way if multiple things happen to flag simultaneously they
> can be handled in one call to the interrupt handler.
Thanks for your comment. Is below code O.K.?
static irqreturn_t da9211_irq_handler(int irq, void *data)
{
	struct da9211 *chip = data;
	int reg_val, err, ret = IRQ_NONE;

	err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, &reg_val);
	if (err < 0)
		goto error_i2c;

	if (reg_val & DA9211_E_OV_CURR_A) {
		regulator_notifier_call_chain(chip->rdev[0],
			REGULATOR_EVENT_OVER_CURRENT,
			rdev_get_drvdata(chip->rdev[0]));

		err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
			DA9211_E_OV_CURR_A);
		if (err < 0)
			goto error_i2c;

		ret = IRQ_HANDLED;
	}

	if (reg_val & DA9211_E_OV_CURR_B) {
		regulator_notifier_call_chain(chip->rdev[1],
			REGULATOR_EVENT_OVER_CURRENT,
			rdev_get_drvdata(chip->rdev[1]));

		err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
			DA9211_E_OV_CURR_B);
		if (err < 0)
			goto error_i2c;

		ret = IRQ_HANDLED;
	}

	return ret;

error_i2c:
	dev_err(chip->dev, "I2C error : %d\n", err);
	return IRQ_NONE;
}
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