linux-kernel - Re: [PATCH] mfd/stmpe: Add support for irq over gpio pin

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Message-ID: <CACRpkdY=uN9W26mE7=TyXGkhcWsfOeGOyTBGQ3WzabNNHqa_-w@mail.gmail.com>
Date:	Mon, 7 Nov 2011 13:29:54 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Viresh Kumar <viresh.kumar@...com>
Cc:	rabin.vincent@...ricsson.com, linux-kernel@...r.kernel.org,
	sameo@...ux.intel.com, armando.visconti@...com,
	shiraz.hashim@...com, vipin.kumar@...com, rajeev-dlh.kumar@...com,
	deepak.sikri@...com, vipulkumar.samar@...com, amit.virdi@...com,
	pratyush.anand@...com, bhupesh.sharma@...com,
	viresh.linux@...il.com, bhavna.yadav@...com,
	vincenzo.frascino@...com, mirko.gardi@...com,
	srinidhi.kasagar@...ricsson.com, linus.walleij@...ricsson.com
Subject: Re: [PATCH] mfd/stmpe: Add support for irq over gpio pin

Hi Viresh,

On Thu, Nov 3, 2011 at 10:26 AM, Viresh Kumar <viresh.kumar@...com> wrote:

> @@ -925,15 +928,28 @@ static int __devinit stmpe_probe(struct i2c_client *i2c,
>
>        i2c_set_clientdata(i2c, stmpe);
>
> +       if (pdata->irq_over_gpio) {
> +               ret = gpio_request_one(pdata->irq_gpio, GPIOF_DIR_IN, "stmpe");
> +               if (ret) {
> +                       dev_err(stmpe->dev, "failed to request IRQ GPIO: %d\n",
> +                                       ret);
> +                       goto out_free;
> +               }
> +
> +               stmpe->irq = gpio_to_irq(pdata->irq_gpio);
> +       } else {
> +               stmpe->irq = i2c->irq;
> +       }
> +
>        ret = stmpe_chip_init(stmpe);
>        if (ret)
> -               goto out_free;
> +               goto free_gpio;
>
>        ret = stmpe_irq_init(stmpe);
>        if (ret)
> -               goto out_free;
> +               goto free_gpio;
>
> -       ret = request_threaded_irq(stmpe->i2c->irq, NULL, stmpe_irq,
> +       ret = request_threaded_irq(stmpe->irq, NULL, stmpe_irq,
>                                   pdata->irq_trigger | IRQF_ONESHOT,
>                                   "stmpe", stmpe);
>        if (ret) {
> @@ -951,9 +967,11 @@ static int __devinit stmpe_probe(struct i2c_client *i2c,
>
>  out_removedevs:
>        mfd_remove_devices(stmpe->dev);
> -       free_irq(stmpe->i2c->irq, stmpe);
> +       free_irq(stmpe->irq, stmpe);
>  out_removeirq:
>        stmpe_irq_remove(stmpe);
> +free_gpio:
> +       gpio_free(pdata->irq_gpio);

Will that work if you didn't request irq over GPIO?

If you did not request GPIO and stmpe_chip_init()
fails this will still be executed.

Maybe:

if (pdata->irq_over_gpio)
   gpio_free(pdata->irq_gpio);

>  out_free:
>        kfree(stmpe);
>        return ret;
> @@ -965,9 +983,12 @@ static int __devexit stmpe_remove(struct i2c_client *client)
>
>        mfd_remove_devices(stmpe->dev);
>
> -       free_irq(stmpe->i2c->irq, stmpe);
> +       free_irq(stmpe->irq, stmpe);
>        stmpe_irq_remove(stmpe);
>
> +       if (stmpe->pdata->irq_over_gpio)
> +               gpio_free(stmpe->pdata->irq_gpio);
> +

Here it seems correct.

> diff --git a/include/linux/mfd/stmpe.h b/include/linux/mfd/stmpe.h
> index be1af7c..7901351 100644
> --- a/include/linux/mfd/stmpe.h
> +++ b/include/linux/mfd/stmpe.h
> @@ -76,6 +76,7 @@ struct stmpe {
>        struct stmpe_variant_info *variant;
>        const u8 *regs;
>
> +       int irq;
>        int irq_base;
>        int num_gpios;
>        u8 ier[2];
> @@ -194,6 +195,8 @@ struct stmpe_platform_data {
>        unsigned int irq_trigger;
>        bool irq_invert_polarity;
>        bool autosleep;
> +       bool irq_over_gpio;
> +       int irq_gpio;
>        int autosleep_timeout;

Please also update the kerneldoc for struct stmpe.

Yours,
Linus Walleij
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