OMAPDSS: HDMI: Create platform device for audio support

Creating the accessory devices, such as audio, from the HDMI driver
allows to regard HDMI as a single entity with audio an display
functionality. This intends to follow the design of drivers such
as MFD, in which a single entity handles the creation of the accessory
devices. Such devices are then used by domain-specific drivers; audio in
this case.

Also, this is in line with the DT implementation of HDMI, in which we will
have a single node to describe this feature of the OMAP SoC.

Signed-off-by: Ricardo Neri <ricardo.neri@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

diff --git a/drivers/video/omap2/dss/hdmi.c b/drivers/video/omap2/dss/hdmi.c
index edc28842b9fdb5cb4c937e3919c5bd89937d7e04..0c2f35bd50283ab21548065de557c1d7dda2b30a 100644 (file)
--- a/drivers/video/omap2/dss/hdmi.c
+++ b/drivers/video/omap2/dss/hdmi.c
@@ -60,6 +60,9 @@
 static struct {
        struct mutex lock;
        struct platform_device *pdev;
+#if defined(CONFIG_OMAP4_DSS_HDMI_AUDIO)
+       struct platform_device *audio_pdev;
+#endif
 
        struct hdmi_ip_data ip_data;
 
@@ -818,6 +821,54 @@ static void hdmi_put_clocks(void)
 }
 
 #if defined(CONFIG_OMAP4_DSS_HDMI_AUDIO)
+static int hdmi_probe_audio(struct platform_device *pdev)
+{
+       struct resource *res;
+       struct platform_device *aud_pdev;
+       u32 port_offset, port_size;
+       struct resource aud_res[2] = {
+               DEFINE_RES_MEM(-1, -1),
+               DEFINE_RES_DMA(-1),
+       };
+
+       res = platform_get_resource(hdmi.pdev, IORESOURCE_MEM, 0);
+       if (!res) {
+               DSSERR("can't get IORESOURCE_MEM HDMI\n");
+               return -EINVAL;
+       }
+
+       /*
+        * Pass DMA audio port to audio drivers.
+        * Audio drivers should not ioremap it.
+        */
+       hdmi.ip_data.ops->audio_get_dma_port(&port_offset, &port_size);
+
+       aud_res[0].start = res->start + port_offset;
+       aud_res[0].end = aud_res[0].start + port_size - 1;
+
+       res = platform_get_resource(hdmi.pdev, IORESOURCE_DMA, 0);
+       if (!res) {
+               DSSERR("can't get IORESOURCE_DMA HDMI\n");
+               return -EINVAL;
+       }
+
+       /* Pass the audio DMA request resource to audio drivers. */
+       aud_res[1].start = res->start;
+
+       /* create platform device for HDMI audio driver */
+       aud_pdev = platform_device_register_simple("omap_hdmi_audio",
+                                                  pdev->id, aud_res,
+                                                  ARRAY_SIZE(aud_res));
+       if (IS_ERR(aud_pdev)) {
+               DSSERR("Can't instantiate hdmi-audio\n");
+               return -ENODEV;
+       }
+
+       hdmi.audio_pdev = aud_pdev;
+
+       return 0;
+}
+
 int hdmi_compute_acr(u32 sample_freq, u32 *n, u32 *cts)
 {
        u32 deep_color;
@@ -1098,6 +1149,12 @@ static int __init omapdss_hdmihw_probe(struct platform_device *pdev)
 
        hdmi_probe_pdata(pdev);
 
+#if defined(CONFIG_OMAP4_DSS_HDMI_AUDIO)
+       r = hdmi_probe_audio(pdev);
+       if (r)
+               DSSWARN("could not create platform device for audio");
+#endif
+
        return 0;
 
 err_panel_init:
@@ -1114,6 +1171,11 @@ static int __exit hdmi_remove_child(struct device *dev, void *data)
 
 static int __exit omapdss_hdmihw_remove(struct platform_device *pdev)
 {
+#if defined(CONFIG_OMAP4_DSS_HDMI_AUDIO)
+       if (hdmi.audio_pdev != NULL)
+               platform_device_unregister(hdmi.audio_pdev);
+#endif
+
        device_for_each_child(&pdev->dev, NULL, hdmi_remove_child);
 
        dss_unregister_child_devices(&pdev->dev);