V4L/DVB (12504): soc-camera: prepare soc_camera_platform.c and its users for conversion

soc_camera_platform.c is only used by y SuperH ap325rxa board. This patch
converts soc_camera_platform.c and its users for the soc-camera platform-
device conversion and also extends soc-camera core to handle non-I2C cameras.

Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

arch/sh/boards/board-ap325rxa.c

@@ -307,6 +307,9 @@ static int camera_set_capture(struct soc_camera_platform_info *info,
 	return ret;
 }
 
+static int ap325rxa_camera_add(struct soc_camera_link *icl, struct device *dev);
+static void ap325rxa_camera_del(struct soc_camera_link *icl);
+
 static struct soc_camera_platform_info camera_info = {
 	.iface = 0,
 	.format_name = "UYVY",
@@ -320,6 +323,10 @@ static struct soc_camera_platform_info camera_info = {
 	.bus_param = SOCAM_PCLK_SAMPLE_RISING | SOCAM_HSYNC_ACTIVE_HIGH |
 	SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_MASTER | SOCAM_DATAWIDTH_8,
 	.set_capture = camera_set_capture,
+	.link = {
+		.add_device	= ap325rxa_camera_add,
+		.del_device	= ap325rxa_camera_del,
+	},
 };
 
 static struct platform_device camera_device = {
@@ -329,15 +336,20 @@ static struct platform_device camera_device = {
 	},
 };
 
-static int __init camera_setup(void)
+static int ap325rxa_camera_add(struct soc_camera_link *icl,
+			       struct device *dev)
 {
-	if (camera_probe() > 0)
-		platform_device_register(&camera_device);
+	if (icl != &camera_info.link || camera_probe() <= 0)
+		return -ENODEV;
 
-	return 0;
+	return platform_device_register(&camera_device);
 }
-late_initcall(camera_setup);
 
+static void ap325rxa_camera_del(struct soc_camera_link *icl)
+{
+	if (icl == &camera_info.link)
+		platform_device_unregister(&camera_device);
+}
 #endif /* CONFIG_I2C */
 
 static int ov7725_power(struct device *dev, int mode)
@@ -417,12 +429,20 @@ static struct ov772x_camera_info ov7725_info = {
 	},
 };
 
-static struct platform_device ap325rxa_camera = {
+static struct platform_device ap325rxa_camera[] = {
+	{
 		.name	= "soc-camera-pdrv",
 		.id	= 0,
 		.dev	= {
 			.platform_data = &ov7725_info.link,
 		},
+	}, {
+		.name	= "soc-camera-pdrv",
+		.id	= 1,
+		.dev	= {
+			.platform_data = &camera_info.link,
+		},
+	},
 };
 
 static struct platform_device *ap325rxa_devices[] __initdata = {
@@ -432,7 +452,8 @@ static struct platform_device *ap325rxa_devices[] __initdata = {
 	&ceu_device,
 	&nand_flash_device,
 	&sdcard_cn3_device,
-	&ap325rxa_camera,
+	&ap325rxa_camera[0],
+	&ap325rxa_camera[1],
 };
 
 static struct spi_board_info ap325rxa_spi_devices[] = {

drivers/media/video/soc_camera.c

@@ -1165,45 +1165,76 @@ void soc_camera_video_stop(struct soc_camera_device *icd)
 }
 EXPORT_SYMBOL(soc_camera_video_stop);
 
-static int __devinit soc_camera_pdrv_probe(struct platform_device *pdev)
+#ifdef CONFIG_I2C_BOARDINFO
+static int soc_camera_init_i2c(struct platform_device *pdev,
+			       struct soc_camera_link *icl)
 {
-	struct soc_camera_link *icl = pdev->dev.platform_data;
-	struct i2c_adapter *adap;
 	struct i2c_client *client;
+	struct i2c_adapter *adap = i2c_get_adapter(icl->i2c_adapter_id);
+	int ret;
 
-	if (!icl)
-		return -EINVAL;
-
-	adap = i2c_get_adapter(icl->i2c_adapter_id);
 	if (!adap) {
-		dev_warn(&pdev->dev, "Cannot get adapter #%d. No driver?\n",
+		ret = -ENODEV;
+		dev_err(&pdev->dev, "Cannot get adapter #%d. No driver?\n",
 			icl->i2c_adapter_id);
-		/* -ENODEV and -ENXIO do not produce an error on probe()... */
-		return -ENOENT;
+		goto ei2cga;
 	}
 
 	icl->board_info->platform_data = icl;
 	client = i2c_new_device(adap, icl->board_info);
 	if (!client) {
-		i2c_put_adapter(adap);
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto ei2cnd;
 	}
 
 	platform_set_drvdata(pdev, client);
 
 	return 0;
+ei2cnd:
+	i2c_put_adapter(adap);
+ei2cga:
+	return ret;
 }
 
-static int __devexit soc_camera_pdrv_remove(struct platform_device *pdev)
+static void soc_camera_free_i2c(struct platform_device *pdev)
 {
 	struct i2c_client *client = platform_get_drvdata(pdev);
 
 	if (!client)
-		return -ENODEV;
+		return;
 
 	i2c_unregister_device(client);
 	i2c_put_adapter(client->adapter);
+}
+#else
+#define soc_camera_init_i2c(d, icl)	(-ENODEV)
+#define soc_camera_free_i2c(d)		do {} while (0)
+#endif
 
+static int __devinit soc_camera_pdrv_probe(struct platform_device *pdev)
+{
+	struct soc_camera_link *icl = pdev->dev.platform_data;
+
+	if (!icl)
+		return -EINVAL;
+
+	if (icl->board_info)
+		return soc_camera_init_i2c(pdev, icl);
+	else if (!icl->add_device || !icl->del_device)
+		return -EINVAL;
+
+	/* &pdev->dev will become &icd->dev */
+	return icl->add_device(icl, &pdev->dev);
+}
+
+static int __devexit soc_camera_pdrv_remove(struct platform_device *pdev)
+{
+	struct soc_camera_link *icl = pdev->dev.platform_data;
+
+	if (icl->board_info)
+		soc_camera_free_i2c(pdev);
+	else
+		icl->del_device(icl);
 	return 0;
 }
 

include/media/soc_camera.h

@@ -102,6 +102,12 @@ struct soc_camera_link {
 	int i2c_adapter_id;
 	struct i2c_board_info *board_info;
 	const char *module_name;
+	/*
+	 * For non-I2C devices platform platform has to provide methods to
+	 * add a device to the system and to remove
+	 */
+	int (*add_device)(struct soc_camera_link *, struct device *);
+	void (*del_device)(struct soc_camera_link *);
 	/* Optional callbacks to power on or off and reset the sensor */
 	int (*power)(struct device *, int);
 	int (*reset)(struct device *);

include/media/soc_camera_platform.h

@@ -12,6 +12,7 @@
 #define __SOC_CAMERA_H__
 
 #include <linux/videodev2.h>
+#include <media/soc_camera.h>
 
 struct soc_camera_platform_info {
 	int iface;
@@ -21,6 +22,7 @@ struct soc_camera_platform_info {
 	unsigned long bus_param;
 	void (*power)(int);
 	int (*set_capture)(struct soc_camera_platform_info *info, int enable);
+	struct soc_camera_link link;
 };
 
 #endif /* __SOC_CAMERA_H__ */