Re: [PATCH v2 03/20] rpmsg: glink: Split rpm_probe to reuse the common code

[Arun Kumar Neelakantam <aneela@codeaurora.org>]

On 8/24/2017 12:51 PM, Sricharan R wrote:
> From: Bjorn Andersson <bjorn.andersson@linaro.org>
>
> There is quite some code common in glink_rpm_probe that
> can reused for glink-smem based transport as well. So
> split the function and move the code to glink_native_probe
> that can be used later when we add the support for
> glink-smem based transport. Also reuse driver's remove as well.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Acked-by: Arun Kumar Neelakantam <aneela@codeaurora.org>

Regards,
Arun N
> ---
>   drivers/rpmsg/qcom_glink_rpm.c | 85 ++++++++++++++++++++++++------------------
>   1 file changed, 49 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/rpmsg/qcom_glink_rpm.c b/drivers/rpmsg/qcom_glink_rpm.c
> index 870ce32..5f0fa0d 100644
> --- a/drivers/rpmsg/qcom_glink_rpm.c
> +++ b/drivers/rpmsg/qcom_glink_rpm.c
> @@ -19,6 +19,7 @@
>   #include <linux/module.h>
>   #include <linux/of.h>
>   #include <linux/of_address.h>
> +#include <linux/of_irq.h>
>   #include <linux/platform_device.h>
>   #include <linux/regmap.h>
>   #include <linux/rpmsg.h>
> @@ -1155,29 +1156,21 @@ static int glink_rpm_parse_toc(struct device *dev,
>   	return -EINVAL;
>   }
>   
> -static int glink_rpm_probe(struct platform_device *pdev)
> +struct qcom_glink *qcom_glink_native_probe(struct device *dev,
> +					   struct qcom_glink_pipe *rx,
> +					   struct qcom_glink_pipe *tx)
>   {
> -	struct qcom_glink *glink;
> -	struct glink_rpm_pipe *rx_pipe;
> -	struct glink_rpm_pipe *tx_pipe;
> -	struct device_node *np;
> -	void __iomem *msg_ram;
> -	size_t msg_ram_size;
> -	struct device *dev = &pdev->dev;
> -	struct resource r;
>   	int irq;
>   	int ret;
> +	struct qcom_glink *glink;
>   
>   	glink = devm_kzalloc(dev, sizeof(*glink), GFP_KERNEL);
>   	if (!glink)
> -		return -ENOMEM;
> +		return ERR_PTR(-ENOMEM);
>   
>   	glink->dev = dev;
> -
> -	rx_pipe = devm_kzalloc(&pdev->dev, sizeof(*rx_pipe), GFP_KERNEL);
> -	tx_pipe = devm_kzalloc(&pdev->dev, sizeof(*tx_pipe), GFP_KERNEL);
> -	if (!rx_pipe || !tx_pipe)
> -		return -ENOMEM;
> +	glink->tx_pipe = tx;
> +	glink->rx_pipe = rx;
>   
>   	mutex_init(&glink->tx_lock);
>   	spin_lock_init(&glink->rx_lock);
> @@ -1188,14 +1181,48 @@ static int glink_rpm_probe(struct platform_device *pdev)
>   	idr_init(&glink->lcids);
>   	idr_init(&glink->rcids);
>   
> -	glink->mbox_client.dev = &pdev->dev;
> +	glink->mbox_client.dev = dev;
>   	glink->mbox_chan = mbox_request_channel(&glink->mbox_client, 0);
>   	if (IS_ERR(glink->mbox_chan)) {
>   		if (PTR_ERR(glink->mbox_chan) != -EPROBE_DEFER)
> -			dev_err(&pdev->dev, "failed to acquire IPC channel\n");
> -		return PTR_ERR(glink->mbox_chan);
> +			dev_err(dev, "failed to acquire IPC channel\n");
> +		return ERR_CAST(glink->mbox_chan);
> +	}
> +
> +	irq = of_irq_get(dev->of_node, 0);
> +	ret = devm_request_irq(dev, irq,
> +			       qcom_glink_intr,
> +			       IRQF_NO_SUSPEND | IRQF_SHARED,
> +			       "glink-native", glink);
> +	if (ret) {
> +		dev_err(dev, "failed to request IRQ\n");
> +		return ERR_PTR(ret);
>   	}
>   
> +	ret = qcom_glink_send_version(glink);
> +	if (ret)
> +		return ERR_PTR(ret);
> +
> +	return glink;
> +}
> +
> +static int glink_rpm_probe(struct platform_device *pdev)
> +{
> +	struct qcom_glink *glink;
> +	struct glink_rpm_pipe *rx_pipe;
> +	struct glink_rpm_pipe *tx_pipe;
> +	struct device_node *np;
> +	void __iomem *msg_ram;
> +	size_t msg_ram_size;
> +	struct device *dev = &pdev->dev;
> +	struct resource r;
> +	int ret;
> +
> +	rx_pipe = devm_kzalloc(&pdev->dev, sizeof(*rx_pipe), GFP_KERNEL);
> +	tx_pipe = devm_kzalloc(&pdev->dev, sizeof(*tx_pipe), GFP_KERNEL);
> +	if (!rx_pipe || !tx_pipe)
> +		return -ENOMEM;
> +
>   	np = of_parse_phandle(dev->of_node, "qcom,rpm-msg-ram", 0);
>   	ret = of_address_to_resource(np, 0, &r);
>   	of_node_put(np);
> @@ -1219,27 +1246,13 @@ static int glink_rpm_probe(struct platform_device *pdev)
>   	tx_pipe->native.avail = glink_rpm_tx_avail;
>   	tx_pipe->native.write = glink_rpm_tx_write;
>   
> -	glink->tx_pipe = &tx_pipe->native;
> -	glink->rx_pipe = &rx_pipe->native;
> -
>   	writel(0, tx_pipe->head);
>   	writel(0, rx_pipe->tail);
>   
> -	irq = platform_get_irq(pdev, 0);
> -	ret = devm_request_irq(dev, irq,
> -			       qcom_glink_intr,
> -			       IRQF_NO_SUSPEND | IRQF_SHARED,
> -			       "glink-rpm", glink);
> -	if (ret) {
> -		dev_err(dev, "Failed to request IRQ\n");
> -		return ret;
> -	}
> -
> -	glink->irq = irq;
> -
> -	ret = qcom_glink_send_version(glink);
> -	if (ret)
> -		return ret;
> +	glink = qcom_glink_native_probe(&pdev->dev, &rx_pipe->native,
> +					&tx_pipe->native);
> +	if (IS_ERR(glink))
> +		return PTR_ERR(glink);
>   
>   	platform_set_drvdata(pdev, glink);
>