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SubjectRe: [PATCH v6 06/12] mfd: wm97xx-core: core support for wm97xx Codec
On Sat, 02 Sep 2017, Robert Jarzmik wrote:

> The WM9705, WM9712 and WM9713 are highly integrated codecs, with an
> audio codec, DAC and ADC, GPIO unit and a touchscreen interface.
>
> Historically the support was spread across drivers/input/touchscreen and
> sound/soc/codecs. The sharing was done through ac97 bus sharing. This
> model will not withstand the new AC97 bus model, where codecs are
> discovered on runtime.
>
> Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
> Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
> ---
> Since v3:
> - added a "depends on AC97_BUS_NEW" Kconfig statement
> - added default values for wm9705, wm9712 per Charles's comment
> Since v4:
> - added Charles's ack
> Since v5:
> - took into account Lee's comments
> ---
> drivers/mfd/Kconfig | 14 ++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/wm97xx-core.c | 379 +++++++++++++++++++++++++++++++++++++++++++++
> include/linux/mfd/wm97xx.h | 25 +++
> 4 files changed, 419 insertions(+)
> create mode 100644 drivers/mfd/wm97xx-core.c
> create mode 100644 include/linux/mfd/wm97xx.h

[...]

> +static struct mfd_cell wm9705_cells[] = {
> + {
> + .name = "wm9705-codec",
> + },
> + {
> + .name = "wm97xx-ts",
> + },
> +};

Nit: These should be one line entries:

{ .name = "wm9705-codec" },
{ .name = "wm97xx-ts" },

[...]

> +static struct mfd_cell wm9712_cells[] = {
> + {
> + .name = "wm9712-codec",
> + },
> + {
> + .name = "wm97xx-ts",
> + },
> +};

As above.

[...]

> +static struct mfd_cell wm9713_cells[] = {
> + {
> + .name = "wm9713-codec",
> + },
> + {
> + .name = "wm97xx-ts",
> + },
> +};

And again.

> +static int wm97xx_ac97_probe(struct ac97_codec_device *adev)
> +{
> + struct wm97xx_priv *wm97xx;
> + const struct regmap_config *config;
> + struct wm97xx_platform_data *codec_pdata;
> + struct mfd_cell *cells;
> + int ret = 0, nb_cells, i;
> + struct wm97xx_pdata *pdata = snd_ac97_codec_get_platdata(adev);
> +
> + wm97xx = devm_kzalloc(ac97_codec_dev2dev(adev),
> + sizeof(*wm97xx), GFP_KERNEL);
> + if (!wm97xx)
> + return -ENOMEM;
> +
> + wm97xx->dev = ac97_codec_dev2dev(adev);
> + wm97xx->ac97 = snd_ac97_compat_alloc(adev);
> + if (IS_ERR(wm97xx->ac97))
> + return PTR_ERR(wm97xx->ac97);
> +
> +
> + ac97_set_drvdata(adev, wm97xx);
> + dev_info(wm97xx->dev, "wm97xx core found, id=0x%x\n",
> + adev->vendor_id);
> +
> + codec_pdata = &wm97xx->codec_pdata;
> + codec_pdata->ac97 = wm97xx->ac97;
> + codec_pdata->batt_pdata = pdata->batt_pdata;
> +
> + switch (adev->vendor_id) {
> + case WM9705_VENDOR_ID:
> + config = &wm9705_regmap_config;
> + cells = wm9705_cells;
> + nb_cells = ARRAY_SIZE(wm9705_cells);
> + break;
> + case WM9712_VENDOR_ID:
> + config = &wm9712_regmap_config;
> + cells = wm9712_cells;
> + nb_cells = ARRAY_SIZE(wm9712_cells);
> + break;
> + case WM9713_VENDOR_ID:
> + config = &wm9713_regmap_config;
> + cells = wm9713_cells;
> + nb_cells = ARRAY_SIZE(wm9713_cells);
> + break;
> + default:
> + config = NULL;

goto an error label here.

> + }
> +
> + for (i = 0; i < nb_cells; i++) {
> + cells[i].platform_data = codec_pdata;
> + cells[i].pdata_size = sizeof(*codec_pdata);
> + }
> +
> + if (config) {
> + codec_pdata->regmap =
> + devm_regmap_init_ac97(wm97xx->ac97, config);
> + if (IS_ERR(codec_pdata->regmap))
> + ret = PTR_ERR(codec_pdata->regmap);

Remove the if and do this regardless.

> + } else {
> + ret = -ENODEV;
> + }

remove this.

> + if (!ret)
> + ret = devm_mfd_add_devices(wm97xx->dev, PLATFORM_DEVID_NONE,
> + cells, nb_cells, NULL, 0, NULL);

Remove the if and do this regardless.

No need to allocate to a variable. Just return the result directly.

> + if (ret)
> + snd_ac97_compat_release(wm97xx->ac97);

Place this in the error path, under the goto label.

> + return ret;
> +}

Once fixed, please apply my:

For my own reference:
Acked-for-MFD-by: Lee Jones <lee.jones@linaro.org>

--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

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