[media] media: mx2_camera: use managed functions to clean up code

Use managed functions to clean up the error handling code and function
mx2_camera_remove().  Along with the change, a few variables get removed
from struct mx2_camera_dev.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Tested-by: Javier Martin <javier.martin@vista-silicon.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/platform/soc_camera/mx2_camera.c b/drivers/media/platform/soc_camera/mx2_camera.c
index 7c67fbc..619df35 100644 (file)
--- a/drivers/media/platform/soc_camera/mx2_camera.c
+++ b/drivers/media/platform/soc_camera/mx2_camera.c
@@ -274,12 +274,9 @@ struct mx2_camera_dev {
        struct soc_camera_device *icd;
        struct clk              *clk_csi, *clk_emma_ahb, *clk_emma_ipg;
 
-       unsigned int            irq_csi, irq_emma;
        void __iomem            *base_csi, *base_emma;
-       unsigned long           base_dma;
 
        struct mx2_camera_platform_data *pdata;
-       struct resource         *res_csi, *res_emma;
        unsigned long           platform_flags;
 
        struct list_head        capture;
@@ -1647,64 +1644,59 @@ static irqreturn_t mx27_camera_emma_irq(int irq_emma, void *data)
        return IRQ_HANDLED;
 }
 
-static int __devinit mx27_camera_emma_init(struct mx2_camera_dev *pcdev)
+static int __devinit mx27_camera_emma_init(struct platform_device *pdev)
 {
-       struct resource *res_emma = pcdev->res_emma;
+       struct mx2_camera_dev *pcdev = platform_get_drvdata(pdev);
+       struct resource *res_emma;
+       int irq_emma;
        int err = 0;
 
-       if (!request_mem_region(res_emma->start, resource_size(res_emma),
-                               MX2_CAM_DRV_NAME)) {
-               err = -EBUSY;
+       res_emma = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+       irq_emma = platform_get_irq(pdev, 1);
+       if (!res_emma || !irq_emma) {
+               dev_err(pcdev->dev, "no EMMA resources\n");
                goto out;
        }
 
-       pcdev->base_emma = ioremap(res_emma->start, resource_size(res_emma));
+       pcdev->base_emma = devm_request_and_ioremap(pcdev->dev, res_emma);
        if (!pcdev->base_emma) {
-               err = -ENOMEM;
-               goto exit_release;
+               err = -EADDRNOTAVAIL;
+               goto out;
        }
 
-       err = request_irq(pcdev->irq_emma, mx27_camera_emma_irq, 0,
-                       MX2_CAM_DRV_NAME, pcdev);
+       err = devm_request_irq(pcdev->dev, irq_emma, mx27_camera_emma_irq, 0,
+                              MX2_CAM_DRV_NAME, pcdev);
        if (err) {
                dev_err(pcdev->dev, "Camera EMMA interrupt register failed \n");
-               goto exit_iounmap;
+               goto out;
        }
 
-       pcdev->clk_emma_ipg = clk_get(pcdev->dev, "emma-ipg");
+       pcdev->clk_emma_ipg = devm_clk_get(pcdev->dev, "emma-ipg");
        if (IS_ERR(pcdev->clk_emma_ipg)) {
                err = PTR_ERR(pcdev->clk_emma_ipg);
-               goto exit_free_irq;
+               goto out;
        }
 
        clk_prepare_enable(pcdev->clk_emma_ipg);
 
-       pcdev->clk_emma_ahb = clk_get(pcdev->dev, "emma-ahb");
+       pcdev->clk_emma_ahb = devm_clk_get(pcdev->dev, "emma-ahb");
        if (IS_ERR(pcdev->clk_emma_ahb)) {
                err = PTR_ERR(pcdev->clk_emma_ahb);
-               goto exit_clk_emma_ipg_put;
+               goto exit_clk_emma_ipg;
        }
 
        clk_prepare_enable(pcdev->clk_emma_ahb);
 
        err = mx27_camera_emma_prp_reset(pcdev);
        if (err)
-               goto exit_clk_emma_ahb_put;
+               goto exit_clk_emma_ahb;
 
        return err;
 
-exit_clk_emma_ahb_put:
+exit_clk_emma_ahb:
        clk_disable_unprepare(pcdev->clk_emma_ahb);
-       clk_put(pcdev->clk_emma_ahb);
-exit_clk_emma_ipg_put:
+exit_clk_emma_ipg:
        clk_disable_unprepare(pcdev->clk_emma_ipg);
-       clk_put(pcdev->clk_emma_ipg);
-exit_free_irq:
-       free_irq(pcdev->irq_emma, pcdev);
-exit_iounmap:
-       iounmap(pcdev->base_emma);
-exit_release:
-       release_mem_region(res_emma->start, resource_size(res_emma));
 out:
        return err;
 }
@@ -1712,9 +1704,8 @@ out:
 static int __devinit mx2_camera_probe(struct platform_device *pdev)
 {
        struct mx2_camera_dev *pcdev;
-       struct resource *res_csi, *res_emma;
-       void __iomem *base_csi;
-       int irq_csi, irq_emma;
+       struct resource *res_csi;
+       int irq_csi;
        int err = 0;
 
        dev_dbg(&pdev->dev, "initialising\n");
@@ -1727,21 +1718,20 @@ static int __devinit mx2_camera_probe(struct platform_device *pdev)
                goto exit;
        }
 
-       pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
+       pcdev = devm_kzalloc(&pdev->dev, sizeof(*pcdev), GFP_KERNEL);
        if (!pcdev) {
                dev_err(&pdev->dev, "Could not allocate pcdev\n");
                err = -ENOMEM;
                goto exit;
        }
 
-       pcdev->clk_csi = clk_get(&pdev->dev, "ahb");
+       pcdev->clk_csi = devm_clk_get(&pdev->dev, "ahb");
        if (IS_ERR(pcdev->clk_csi)) {
                dev_err(&pdev->dev, "Could not get csi clock\n");
                err = PTR_ERR(pcdev->clk_csi);
-               goto exit_kfree;
+               goto exit;
        }
 
-       pcdev->res_csi = res_csi;
        pcdev->pdata = pdev->dev.platform_data;
        if (pcdev->pdata) {
                long rate;
@@ -1751,11 +1741,11 @@ static int __devinit mx2_camera_probe(struct platform_device *pdev)
                rate = clk_round_rate(pcdev->clk_csi, pcdev->pdata->clk * 2);
                if (rate <= 0) {
                        err = -ENODEV;
-                       goto exit_dma_free;
+                       goto exit;
                }
                err = clk_set_rate(pcdev->clk_csi, rate);
                if (err < 0)
-                       goto exit_dma_free;
+                       goto exit;
        }
 
        INIT_LIST_HEAD(&pcdev->capture);
@@ -1763,50 +1753,36 @@ static int __devinit mx2_camera_probe(struct platform_device *pdev)
        INIT_LIST_HEAD(&pcdev->discard);
        spin_lock_init(&pcdev->lock);
 
-       /*
-        * Request the regions.
-        */
-       if (!request_mem_region(res_csi->start, resource_size(res_csi),
-                               MX2_CAM_DRV_NAME)) {
-               err = -EBUSY;
-               goto exit_dma_free;
+       pcdev->base_csi = devm_request_and_ioremap(&pdev->dev, res_csi);
+       if (!pcdev->base_csi) {
+               err = -EADDRNOTAVAIL;
+               goto exit;
        }
 
-       base_csi = ioremap(res_csi->start, resource_size(res_csi));
-       if (!base_csi) {
-               err = -ENOMEM;
-               goto exit_release;
-       }
-       pcdev->irq_csi = irq_csi;
-       pcdev->base_csi = base_csi;
-       pcdev->base_dma = res_csi->start;
        pcdev->dev = &pdev->dev;
+       platform_set_drvdata(pdev, pcdev);
 
        if (cpu_is_mx25()) {
-               err = request_irq(pcdev->irq_csi, mx25_camera_irq, 0,
-                               MX2_CAM_DRV_NAME, pcdev);
+               err = devm_request_irq(&pdev->dev, irq_csi, mx25_camera_irq, 0,
+                                      MX2_CAM_DRV_NAME, pcdev);
                if (err) {
                        dev_err(pcdev->dev, "Camera interrupt register failed \n");
-                       goto exit_iounmap;
+                       goto exit;
                }
        }
 
        if (cpu_is_mx27()) {
-               /* EMMA support */
-               res_emma = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-               irq_emma = platform_get_irq(pdev, 1);
-
-               if (!res_emma || !irq_emma) {
-                       dev_err(&pdev->dev, "no EMMA resources\n");
-                       goto exit_free_irq;
-               }
-
-               pcdev->res_emma = res_emma;
-               pcdev->irq_emma = irq_emma;
-               if (mx27_camera_emma_init(pcdev))
-                       goto exit_free_irq;
+               err = mx27_camera_emma_init(pdev);
+               if (err)
+                       goto exit;
        }
 
+       /*
+        * We're done with drvdata here.  Clear the pointer so that
+        * v4l2 core can start using drvdata on its purpose.
+        */
+       platform_set_drvdata(pdev, NULL);
+
        pcdev->soc_host.drv_name        = MX2_CAM_DRV_NAME,
        pcdev->soc_host.ops             = &mx2_soc_camera_host_ops,
        pcdev->soc_host.priv            = pcdev;
@@ -1833,25 +1809,9 @@ exit_free_emma:
        vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
 eallocctx:
        if (cpu_is_mx27()) {
-               free_irq(pcdev->irq_emma, pcdev);
                clk_disable_unprepare(pcdev->clk_emma_ipg);
-               clk_put(pcdev->clk_emma_ipg);
                clk_disable_unprepare(pcdev->clk_emma_ahb);
-               clk_put(pcdev->clk_emma_ahb);
-               iounmap(pcdev->base_emma);
-               release_mem_region(pcdev->res_emma->start, resource_size(pcdev->res_emma));
        }
-exit_free_irq:
-       if (cpu_is_mx25())
-               free_irq(pcdev->irq_csi, pcdev);
-exit_iounmap:
-       iounmap(base_csi);
-exit_release:
-       release_mem_region(res_csi->start, resource_size(res_csi));
-exit_dma_free:
-       clk_put(pcdev->clk_csi);
-exit_kfree:
-       kfree(pcdev);
 exit:
        return err;
 }
@@ -1861,35 +1821,16 @@ static int __devexit mx2_camera_remove(struct platform_device *pdev)
        struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
        struct mx2_camera_dev *pcdev = container_of(soc_host,
                        struct mx2_camera_dev, soc_host);
-       struct resource *res;
-
-       clk_put(pcdev->clk_csi);
-       if (cpu_is_mx25())
-               free_irq(pcdev->irq_csi, pcdev);
-       if (cpu_is_mx27())
-               free_irq(pcdev->irq_emma, pcdev);
 
        soc_camera_host_unregister(&pcdev->soc_host);
 
        vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
 
-       iounmap(pcdev->base_csi);
-
        if (cpu_is_mx27()) {
                clk_disable_unprepare(pcdev->clk_emma_ipg);
-               clk_put(pcdev->clk_emma_ipg);
                clk_disable_unprepare(pcdev->clk_emma_ahb);
-               clk_put(pcdev->clk_emma_ahb);
-               iounmap(pcdev->base_emma);
-               res = pcdev->res_emma;
-               release_mem_region(res->start, resource_size(res));
        }
 
-       res = pcdev->res_csi;
-       release_mem_region(res->start, resource_size(res));
-
-       kfree(pcdev);
-
        dev_info(&pdev->dev, "MX2 Camera driver unloaded\n");
 
        return 0;