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From: Johan Hovold <johan@kernel.org>
To: Peter Hung <hpeter@gmail.com>
Cc: johan@kernel.org, gregkh@linuxfoundation.org,
	linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
	tom_tsai@fintek.com.tw, peter_hong@fintek.com.tw,
	Peter Hung <hpeter+linux_kernel@gmail.com>
Subject: Re: [PATCH V8 04/10] USB: f81232: implement read IIR/MSR with endpoint
Date: Sat, 14 Mar 2015 13:02:31 +0100	[thread overview]
Message-ID: <20150314120231.GD9442@localhost> (raw)
In-Reply-To: <1424944936-7117-5-git-send-email-hpeter+linux_kernel@gmail.com>

On Thu, Feb 26, 2015 at 06:02:10PM +0800, Peter Hung wrote:
> The interrupt endpoint will report current IIR. If we got IIR with MSR changed
> , We will do read MSR with interrupt_work worker to do f81232_read_msr()
> function.
> 
> Signed-off-by: Peter Hung <hpeter+linux_kernel@gmail.com>
> ---
>  drivers/usb/serial/f81232.c | 126 +++++++++++++++++++++++++++++++++++++++++---
>  1 file changed, 118 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
> index cf5b902..46a81ef 100644
> --- a/drivers/usb/serial/f81232.c
> +++ b/drivers/usb/serial/f81232.c
> @@ -31,6 +31,13 @@ static const struct usb_device_id id_table[] = {
>  };
>  MODULE_DEVICE_TABLE(usb, id_table);
>  
> +/* USB Control EP parameter */
> +#define F81232_REGISTER_REQUEST	0xa0
> +#define F81232_GET_REGISTER	0xc0
> +
> +#define SERIAL_BASE_ADDRESS	0x0120
> +#define MODEM_STATUS_REGISTER	(0x06 + SERIAL_BASE_ADDRESS)

Could you indent the values using two tabs so the
INTERRUPT_ENABLE_REGISTER in a following patch will also fit?

> +
>  #define CONTROL_DTR			0x01
>  #define CONTROL_RTS			0x02
>  
> @@ -49,19 +56,112 @@ struct f81232_private {
>  	struct mutex lock;
>  	u8 line_control;
>  	u8 modem_status;
> +	struct work_struct interrupt_work;
> +	struct usb_serial_port *port;
>  };
>  
> +static int f81232_get_register(struct usb_serial_port *port, u16 reg, u8 *val)
> +{
> +	int status;
> +	u8 *tmp;
> +	struct usb_device *dev = port->serial->dev;
> +
> +	tmp = kmalloc(sizeof(*val), GFP_KERNEL);
> +	if (!tmp)
> +		return -ENOMEM;
> +
> +	status = usb_control_msg(dev,
> +				usb_rcvctrlpipe(dev, 0),
> +				F81232_REGISTER_REQUEST,
> +				F81232_GET_REGISTER,
> +				reg,
> +				0,
> +				tmp,
> +				sizeof(u8),

Please use sizeof(*val) here as well for consistency,

> +				USB_CTRL_GET_TIMEOUT);
> +	if (status != sizeof(*val)) {
> +		dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
> +
> +		if (status == 0)
> +			status = -EIO;
> +		else
> +			status = usb_translate_errors(status);

Could you rewrite this as

	if (status < 0)
		status = usb_translate_errors(status);
	else
		status = 0;

> +	} else {
> +		status = 0;
> +		*val = *tmp;
> +	}
> +
> +	kfree(tmp);
> +	return status;
> +}

Same comments apply to set_register in a follow up patch.

Looks good otherwise,
Johan

  reply	other threads:[~2015-03-14 12:02 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-26 10:02 [PATCH V8 00/10] USB: f81232: V8 patches Peter Hung
2015-02-26 10:02 ` [PATCH V8 01/10] USB: f81232: rename private struct member name Peter Hung
2015-02-26 10:02 ` [PATCH V8 02/10] USB: f81232: implement RX bulk-in EP Peter Hung
2015-03-14 11:48   ` Johan Hovold
2015-03-16  2:53     ` Peter Hung
2015-03-16  8:52       ` Johan Hovold
2015-03-16  9:15         ` Peter Hung
2015-02-26 10:02 ` [PATCH V8 03/10] USB: f81232: change lock mechanism Peter Hung
2015-02-26 10:02 ` [PATCH V8 04/10] USB: f81232: implement read IIR/MSR with endpoint Peter Hung
2015-03-14 12:02   ` Johan Hovold [this message]
2015-03-16  3:08     ` Peter Hung
2015-03-16  8:55       ` Johan Hovold
2015-03-16  9:18         ` Peter Hung
2015-02-26 10:02 ` [PATCH V8 05/10] USB: f81232: implement MCR/MSR function Peter Hung
2015-03-14 12:09   ` Johan Hovold
2015-02-26 10:02 ` [PATCH V8 06/10] USB: f81232: implement port enable/disable method Peter Hung
2015-02-26 10:02 ` [PATCH V8 07/10] USB: f81232: implement set_termios() Peter Hung
2015-03-14 12:24   ` Johan Hovold
2015-02-26 10:02 ` [PATCH V8 08/10] USB: f81232: clarify f81232_ioctl() and fix Peter Hung
2015-03-14 12:27   ` Johan Hovold
2015-02-26 10:02 ` [PATCH V8 09/10] USB: f81232: cleanup non-used define Peter Hung
2015-02-26 10:02 ` [PATCH V8 10/10] USB: f81232: modify/add author Peter Hung
2015-03-05  5:59 ` [PATCH V8 00/10] USB: f81232: V8 patches Peter Hung
2015-03-05  7:03   ` Johan Hovold
2015-03-14 12:30     ` Johan Hovold

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