Re: [PATCH 1/2] maps/mtd-ram: refactor probe and remove

[Grant Likely <grant.likely@secretlab.ca>]

On Wed, Jan 21, 2009 at 11:41 AM, Wolfram Sang <w.sang@pengutronix.de> wrote:
> Refactor the probe and remove routines of the mtd-ram driver to export
> a generic part which can later be accessed by an of-counterpart of this
> driver. Tested with a phyCORE-MPC5200B-IO.
>
> Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>

On brief review, looks okay by me.

Acked-by: Grant Likely <grant.likely@secretlab.ca>

> ---
>  drivers/mtd/maps/plat-ram.c  |  123 +++++++++++++++++++++---------------------
>  include/linux/mtd/plat-ram.h |    4 ++
>  2 files changed, 66 insertions(+), 61 deletions(-)
>
> diff --git a/drivers/mtd/maps/plat-ram.c b/drivers/mtd/maps/plat-ram.c
> index e7dd9c8..1582cd6 100644
> --- a/drivers/mtd/maps/plat-ram.c
> +++ b/drivers/mtd/maps/plat-ram.c
> @@ -50,16 +50,6 @@ struct platram_info {
>        struct platdata_mtd_ram *pdata;
>  };
>
> -/* to_platram_info()
> - *
> - * device private data to struct platram_info conversion
> -*/
> -
> -static inline struct platram_info *to_platram_info(struct platform_device *dev)
> -{
> -       return (struct platram_info *)platform_get_drvdata(dev);
> -}
> -
>  /* platram_setrw
>  *
>  * call the platform device's set rw/ro control
> @@ -77,18 +67,14 @@ static inline void platram_setrw(struct platram_info *info, int to)
>                (info->pdata->set_rw)(info->dev, to);
>  }
>
> -/* platram_remove
> - *
> - * called to remove the device from the driver's control
> -*/
> -
> -static int platram_remove(struct platform_device *pdev)
> +int __platram_remove(struct device *dev)
>  {
> -       struct platram_info *info = to_platram_info(pdev);
> +       struct platram_info *info;
>
> -       platform_set_drvdata(pdev, NULL);
> +       dev_dbg(dev, "removing device\n");
>
> -       dev_dbg(&pdev->dev, "removing device\n");
> +       info = dev_get_drvdata(dev);
> +       dev_set_drvdata(dev, NULL);
>
>        if (info == NULL)
>                return 0;
> @@ -123,68 +109,49 @@ static int platram_remove(struct platform_device *pdev)
>
>        return 0;
>  }
> +EXPORT_SYMBOL_GPL(__platram_remove);
>
> -/* platram_probe
> +/* platram_remove
>  *
> - * called from device drive system when a device matching our
> - * driver is found.
> + * called to remove the device from the driver's control
>  */
>
> -static int platram_probe(struct platform_device *pdev)
> +static int platram_remove(struct platform_device *pdev)
> +{
> +       return __platram_remove(&pdev->dev);
> +}
> +
> +int __platram_probe(struct device *dev, const char *name,
> +                       struct resource *res, struct platdata_mtd_ram *pdata)
>  {
> -       struct platdata_mtd_ram *pdata;
>        struct platram_info *info;
> -       struct resource *res;
>        int err = 0;
>
> -       dev_dbg(&pdev->dev, "probe entered\n");
> -
> -       if (pdev->dev.platform_data == NULL) {
> -               dev_err(&pdev->dev, "no platform data supplied\n");
> -               err = -ENOENT;
> -               goto exit_error;
> -       }
> -
> -       pdata = pdev->dev.platform_data;
> -
>        info = kzalloc(sizeof(*info), GFP_KERNEL);
>        if (info == NULL) {
> -               dev_err(&pdev->dev, "no memory for flash info\n");
> +               dev_err(dev, "no memory for flash info\n");
>                err = -ENOMEM;
>                goto exit_error;
>        }
>
> -       platform_set_drvdata(pdev, info);
> +       dev_set_drvdata(dev, info);
>
> -       info->dev = &pdev->dev;
> +       info->dev = dev;
>        info->pdata = pdata;
>
> -       /* get the resource for the memory mapping */
> -
> -       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -
> -       if (res == NULL) {
> -               dev_err(&pdev->dev, "no memory resource specified\n");
> -               err = -ENOENT;
> -               goto exit_free;
> -       }
> -
> -       dev_dbg(&pdev->dev, "got platform resource %p (0x%llx)\n", res,
> -               (unsigned long long)res->start);
> -
>        /* setup map parameters */
>
>        info->map.phys = res->start;
>        info->map.size = (res->end - res->start) + 1;
>        info->map.name = pdata->mapname != NULL ?
> -                       (char *)pdata->mapname : (char *)pdev->name;
> +                       (char *)pdata->mapname : (char *)name;
>        info->map.bankwidth = pdata->bankwidth;
>
>        /* register our usage of the memory area */
>
> -       info->area = request_mem_region(res->start, info->map.size, pdev->name);
> +       info->area = request_mem_region(res->start, info->map.size, name);
>        if (info->area == NULL) {
> -               dev_err(&pdev->dev, "failed to request memory region\n");
> +               dev_err(dev, "failed to request memory region\n");
>                err = -EIO;
>                goto exit_free;
>        }
> @@ -192,17 +159,17 @@ static int platram_probe(struct platform_device *pdev)
>        /* remap the memory area */
>
>        info->map.virt = ioremap(res->start, info->map.size);
> -       dev_dbg(&pdev->dev, "virt %p, %lu bytes\n", info->map.virt, info->map.size);
> +       dev_dbg(dev, "virt %p, %lu bytes\n", info->map.virt, info->map.size);
>
>        if (info->map.virt == NULL) {
> -               dev_err(&pdev->dev, "failed to ioremap() region\n");
> +               dev_err(dev, "failed to ioremap() region\n");
>                err = -EIO;
>                goto exit_free;
>        }
>
>        simple_map_init(&info->map);
>
> -       dev_dbg(&pdev->dev, "initialised map, probing for mtd\n");
> +       dev_dbg(dev, "initialised map, probing for mtd\n");
>
>        /* probe for the right mtd map driver
>         * supplied by the platform_data struct */
> @@ -218,7 +185,7 @@ static int platram_probe(struct platform_device *pdev)
>                info->mtd = do_map_probe("map_ram", &info->map);
>
>        if (info->mtd == NULL) {
> -               dev_err(&pdev->dev, "failed to probe for map_ram\n");
> +               dev_err(dev, "failed to probe for map_ram\n");
>                err = -ENOMEM;
>                goto exit_free;
>        }
> @@ -249,20 +216,54 @@ static int platram_probe(struct platform_device *pdev)
>  #endif /* CONFIG_MTD_PARTITIONS */
>
>        if (add_mtd_device(info->mtd)) {
> -               dev_err(&pdev->dev, "add_mtd_device() failed\n");
> +               dev_err(dev, "add_mtd_device() failed\n");
>                err = -ENOMEM;
>        }
>
>        if (!err)
> -               dev_info(&pdev->dev, "registered mtd device\n");
> +               dev_info(dev, "registered mtd device\n");
>
>        return err;
>
>  exit_free:
> -       platram_remove(pdev);
> +       __platram_remove(dev);
>  exit_error:
>        return err;
>  }
> +EXPORT_SYMBOL_GPL(__platram_probe);
> +
> +/* platram_probe
> + *
> + * called from device drive system when a device matching our
> + * driver is found.
> +*/
> +
> +static int platram_probe(struct platform_device *pdev)
> +{
> +       struct platdata_mtd_ram *pdata;
> +       struct resource *res;
> +
> +       dev_dbg(&pdev->dev, "probe entered\n");
> +
> +       pdata = pdev->dev.platform_data;
> +       if (pdata == NULL) {
> +               dev_err(&pdev->dev, "no platform data supplied\n");
> +               return -ENOENT;
> +       }
> +
> +       /* get the resource for the memory mapping */
> +
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +       if (res == NULL) {
> +               dev_err(&pdev->dev, "no memory resource specified\n");
> +               return -ENOENT;
> +       }
> +
> +       dev_dbg(&pdev->dev, "got platform resource %p (0x%llx)\n", res,
> +               (unsigned long long)res->start);
> +
> +       return __platram_probe(&pdev->dev, pdev->name, res, pdata);
> +}
>
>  /* device driver info */
>
> diff --git a/include/linux/mtd/plat-ram.h b/include/linux/mtd/plat-ram.h
> index e07890a..c522562 100644
> --- a/include/linux/mtd/plat-ram.h
> +++ b/include/linux/mtd/plat-ram.h
> @@ -31,4 +31,8 @@ struct platdata_mtd_ram {
>        void    (*set_rw)(struct device *dev, int to);
>  };
>
> +extern int __platram_probe(struct device *dev, const char *name,
> +                       struct resource *res, struct platdata_mtd_ram *pdata);
> +extern int __platram_remove(struct device *dev);
> +
>  #endif /* __LINUX_MTD_PLATRAM_H */
> --
> 1.5.6.5
>
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>



-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.