On Tuesday 20 November 2012 at 14:25:57, Arnd Bergmann wrote:
> On Tuesday 20 November 2012, Lars Poeschel wrote:
> > From: Lars Poeschel <poeschel@xxxxxxxxxxx>
> >
> > This driver allows to use a lcd2s 20x4 character display as
> > a linux console output device.
> >
> > Signed-off-by: Lars Poeschel <poeschel@xxxxxxxxxxx>
>
> The driver looks nice overall, but I found two style issues:
Thank you for your feedback.
> > +static int __devinit lcd2s_i2c_probe(struct i2c_client *i2c,
> > + const struct i2c_device_id *id)
> > +{
> > + struct lcd2s_data *data;
> > +
> > + if (!i2c_check_functionality(i2c->adapter,
> > + I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
> > + return -EIO;
> > + data = devm_kzalloc(&i2c->dev, sizeof(struct lcd2s_data),
GFP_KERNEL);
> > + if (!data)
> > + return -ENOMEM;
> > +
> > + data->i2c = i2c;
> > + data->consw.owner = THIS_MODULE;
> > + data->consw.con_startup = lcd2s_startup;
> > + data->consw.con_init = lcd2s_init;
> > + data->consw.con_deinit = lcd2s_deinit;
> > + data->consw.con_clear = lcd2s_clear;
> > + data->consw.con_putc = lcd2s_putc;
> > + data->consw.con_putcs = lcd2s_putcs;
> > + data->consw.con_cursor = lcd2s_cursor;
> > + data->consw.con_scroll = lcd2s_scroll;
> > + data->consw.con_bmove = lcd2s_bmove;
> > + data->consw.con_switch = lcd2s_switch;
> > + data->consw.con_blank = lcd2s_blank;
> > + data->consw.con_set_palette = lcd2s_set_palette;
> > + data->consw.con_scrolldelta = lcd2s_scrolldelta;
> > +
> > + i2c_set_clientdata(i2c, data);
> > +
> > + take_over_console(&data->consw, LCD2S_FIRST, LCD2S_LAST, 1);
> > +
> > + return 0;
> > +}
>
> It's better to define the struct consw as a preinitialized
> 'static const' object, rather than dynamically setting each
> member.
I could not find a place to store the drivers private data inside the struct
vc_data. I wanted to have the struct consw inside the drivers private data
(struct lcd2s_data) to be able to container_of to the drivers private data in
the consw.con_* functions. This makes it possible to use more than one actual
lcd2s display with the same driver. Otherwise I have to store the struct
i2c_client somewhere statically and the driver can control only one display
and has to forbid to be probed a second time. Or am I wrong somewhere ?
Lars
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