linux-kernel - Re: [PATCH V6 1/1] usb:serial: Add Fintek F81532/534 driver

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Date:	Wed, 4 Nov 2015 16:41:54 +0800
From:	Peter Hung <hpeter@...il.com>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
Cc:	johan@...nel.org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	USB <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	tom_tsai@...tek.com.tw, peter_hong@...tek.com.tw,
	Peter Hung <hpeter+linux_kernel@...il.com>
Subject: Re: [PATCH V6 1/1] usb:serial: Add Fintek F81532/534 driver

Hi

Andy Shevchenko 於 2015/11/3 下午 05:45 寫道:
> On Tue, Nov 3, 2015 at 5:51 AM, Peter Hung <hpeter@...il.com> wrote:
>> + *    Please reference https://bitbucket.org/hpeter/fintek-general/src/
>> + *    with f81534/tools to get set_gpio.c & set_mode.c. Please use it
>> + *    carefully.
>
> Would it be good to have this under Documentation ?

I had some documents in source code. The link is the demo program to
implement switch UART/PIN funcion. I'll try to add for document with the
repository.

>> +static void f81534_dtr_rts(struct usb_serial_port *port, int on);
>> +
>> +static int f81534_set_port_mode(struct usb_serial_port *port,
>> +                                       enum uart_mode eMode);
>> +
>> +static int f81534_save_configure_data(struct usb_serial_port *port);
>> +
>> +static int f81534_switch_gpio_mode(struct usb_serial_port *port, u8 mode);
>> +
>> +static void f81534_wakeup_all_port(struct usb_serial *serial);
>> +
>> +static void f81534_compare_msr(struct usb_serial_port *port, u8 *msr,
>> +                                       bool is_port_open);
>> +
>> +static int f81534_prepare_write_buffer(struct usb_serial_port *port,
>> +                                       void *dest, size_t size);
>> +
>> +static int f81534_submit_writer(struct usb_serial_port *port, gfp_t mem_flags);
>
> Would it be possible to reshuffle code to reduce amount of forward declarations?
>

I'll try to reduce it.

>
>> +                       if ((size <= F81534_MAX_DATA_BLOCK) &&
>> +                                       (read_size == (count + 1))) {
>
> No need to have internal parens.
>

In my opinion, It makes more readable. Should I remove it?


>> +       if (baudrate <= 115200) {
>> +               value = 0x01;   /* 1.846m fixed */
>> +               divisor = f81534_calc_baud_divisor(baudrate, 115200, NULL);
>> +               port_priv->current_baud_base = 115200;
>> +       } else {
>> +               for (count = 0; count < ARRAY_SIZE(baudrate_table) ; ++count) {
>> +                       baud_base = baudrate_table[count];
>> +                       divisor = f81534_calc_baud_divisor(baudrate, baud_base,
>> +                                                               &rem);
>> +                       if (!rem) {
>> +                               dev_dbg(&port->dev, "%s: found clockbase %d\n",
>> +                                               __func__,
>> +                                               baudrate_table[count]);
>> +                               value = clock_table[count];
>> +                               port_priv->current_baud_base = baud_base;
>> +                               break;
>> +                       }
>> +               }
>
> Can you calculate baud rates more precisely? Any link to datasheet
> where it's described?
>

I'll try to comment it within source code.

>> +static int f81534_ioctl_get_rs485(struct usb_serial_port *port,
>> +                                       struct serial_rs485 __user *arg)
>> +{
>> +       int status;
>> +       struct serial_rs485 data;
>> +       struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
>> +       struct f81534_serial_private *serial_priv =
>> +                       usb_get_serial_data(port->serial);
>
> One line?
>

It's over 80 character with a tab, It cant be one line.

I'll fix other issue that you mention.

Thanks for your advices.
-- 
With Best Regards,
Peter Hung
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