From: j.uzycki@elproma•com.pl (Janusz Użycki)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH] gpio: mxs: implement get_direction callback
Date: Mon, 17 Nov 2014 18:26:12 +0100 [thread overview]
Message-ID: <546A2FB4.8060907@elproma.com.pl> (raw)
In-Reply-To: <CACQ1gAje6OA_n37jE_WnSqg4R+U5tr-bGnnfxpGM5NE9c=dAVg@mail.gmail.com>
W dniu 2014-11-17 o 11:05, Richard Genoud pisze:
> 2014-11-17 10:59 GMT+01:00 Uwe Kleine-K?nig <u.kleine-koenig@pengutronix•de>:
>> Hello Richard,
>>
>>>>>>> So finally the prototypes would be:
>>>>>>> int mctrl_gpio_request_irqs(struct mctrl_gpios*, struct
>>>>>>> uart_port*, irqhandler_t);
>>>>>>> void mctrl_gpio_free_irqs(struct mctrl_gpios*);
>>>>> I think:
>>>>>
>>>>> struct mctrl_gpios {
>>>>> struct uart_port *port;
>>>>> struct {
>>>>> gpio_desc *gpio;
>>>>> unsigned int irq;
>>> I think it's just "int irq;" there
>> irqs are unsigned. Some functions returning an irq use "int", but
>> depending on who you ask this only for error reporting or a relict.
>> Use 0 for invalid/unused in mctrl_gpio*.
>>
>>>> Yes. I tried to assign irq value in mctrl_gpio_init() only.
>>>> There was another issue if CONFIG_GPIOLIB is not defined but it looks mctrl_
>>>> disable/enable_ms()
>>>> and mctrl_ irq handler solve the problem.
>>>>
>>>>> Not sure there is a corresponding request_irq variant for that.
>>>>
>>>> What would you propose?
>>> In atmel_request_gpio_irq(), the function irq_set_status_flags(irq,
>>> IRQ_NOAUTOEN); is used before request_irq to prevent the irq from
>>> being enabled when requested.
>> I'm not sure this is allowed. How do you handle request_irq failing? (I
>> just checked: you don't.) Consider another thread just doing
>> request_irq($yourirq, ...) between
>>
>> irq_set_status_flags(irq[i], IRQ_NOAUTOEN);
>>
>> and
>>
>> err = request_irq(irq[i], ...
> well, in this case, request_irq() will fail and all the previously
> requested irqs will be freed:
> /*
> * If something went wrong, rollback.
> */
> while (err && (--i >= 0))
> if (irq[i] >= 0)
> free_irq(irq[i], port);
I finally returned "unsigned int irq" into "int irq" because
gpiod_to_irq() returns int also.
It makes code longer, no more.
I've changed (irq >= 0) to (irq > 0) only.
best regards
Janusz
next prev parent reply other threads:[~2014-11-17 17:26 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-14 22:27 [PATCH] gpio: mxs: implement get_direction callback Janusz Uzycki
2014-11-14 23:26 ` Uwe Kleine-König
2014-11-15 19:29 ` Janusz Użycki
2014-11-16 21:42 ` Uwe Kleine-König
2014-11-16 21:48 ` Uwe Kleine-König
2014-11-16 23:59 ` Janusz Użycki
2014-11-17 1:58 ` Janusz Użycki
2014-11-17 8:28 ` Uwe Kleine-König
2014-11-17 8:38 ` Alexander Shiyan
2014-11-17 8:44 ` Uwe Kleine-König
2014-11-17 8:53 ` Alexander Shiyan
2014-11-17 9:11 ` Janusz Użycki
2014-11-17 9:39 ` Uwe Kleine-König
2014-11-17 9:46 ` Richard Genoud
2014-11-17 9:59 ` Uwe Kleine-König
2014-11-17 10:05 ` Richard Genoud
2014-11-17 14:29 ` Janusz Użycki
2014-11-17 16:14 ` Richard Genoud
2014-11-17 15:53 ` Uwe Kleine-König
2014-11-17 15:58 ` Janusz Użycki
2014-11-17 16:02 ` Uwe Kleine-König
2014-11-17 16:04 ` Richard Genoud
2014-11-17 17:26 ` Janusz Użycki [this message]
2014-11-17 10:05 ` Alexander Shiyan
2014-11-17 10:09 ` Russell King - ARM Linux
2014-11-17 10:10 ` Richard Genoud
2014-11-17 10:17 ` Russell King - ARM Linux
2014-11-17 12:40 ` Janusz Użycki
2014-11-17 9:51 ` request an irq without enabling? [Was: Re: [PATCH] gpio: mxs: implement get_direction callback] Uwe Kleine-König
2014-11-17 9:57 ` Richard Genoud
2014-11-17 17:00 ` [PATCH] gpio: mxs: implement get_direction callback Janusz Użycki
2014-11-17 17:07 ` Janusz Użycki
2014-11-17 18:42 ` Uwe Kleine-König
2014-11-17 19:02 ` Janusz Użycki
2014-11-17 22:21 ` Uwe Kleine-König
2014-11-18 9:59 ` Janusz Użycki
2014-11-17 9:26 ` Richard Genoud
2014-11-17 14:45 ` Janusz Użycki
2014-11-17 15:59 ` Uwe Kleine-König
2014-11-17 8:31 ` Richard Genoud
2014-11-17 8:39 ` Uwe Kleine-König
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=546A2FB4.8060907@elproma.com.pl \
--to=j.uzycki@elproma$(echo .)com.pl \
--cc=linux-arm-kernel@lists$(echo .)infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox