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authorGuennadi Liakhovetski <g.liakhovetski@gmx.de>2013-07-30 08:01:55 -0300
committerMauro Carvalho Chehab <m.chehab@samsung.com>2013-08-18 09:03:12 -0300
commit23272427ccf70d40b3abb81ea92f505adc1bdcd1 (patch)
treed1f6c54b047f7a755ad65c5bf1a14d7ca65f48c6 /drivers/media/platform/soc_camera
parent85e86c6e8d400c6b794e971ee14251e7ad3467aa (diff)
[media] V4L2: soc-camera: fix requesting regulators in synchronous case
With synchronous subdevice probing regulators should be requested by the soc-camera core in soc_camera_pdrv_probe(). Subdevice drivers, supporting asynchronous probing, call soc_camera_power_init() to request regulators. Erroneously, the same regulator array is used in the latter case as in the former, which leads to a failure. This patch fixes it by preventing the second regulator request from being executed. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'drivers/media/platform/soc_camera')
-rw-r--r--drivers/media/platform/soc_camera/soc_camera.c33
1 files changed, 27 insertions, 6 deletions
diff --git a/drivers/media/platform/soc_camera/soc_camera.c b/drivers/media/platform/soc_camera/soc_camera.c
index dc1b26cf245c..387a232d95a4 100644
--- a/drivers/media/platform/soc_camera/soc_camera.c
+++ b/drivers/media/platform/soc_camera/soc_camera.c
@@ -136,7 +136,7 @@ EXPORT_SYMBOL(soc_camera_power_off);
int soc_camera_power_init(struct device *dev, struct soc_camera_subdev_desc *ssdd)
{
-
+ /* Should not have any effect in synchronous case */
return devm_regulator_bulk_get(dev, ssdd->num_regulators,
ssdd->regulators);
}
@@ -1311,6 +1311,7 @@ eusrfmt:
static int soc_camera_i2c_init(struct soc_camera_device *icd,
struct soc_camera_desc *sdesc)
{
+ struct soc_camera_subdev_desc *ssdd;
struct i2c_client *client;
struct soc_camera_host *ici;
struct soc_camera_host_desc *shd = &sdesc->host_desc;
@@ -1333,7 +1334,21 @@ static int soc_camera_i2c_init(struct soc_camera_device *icd,
return -ENODEV;
}
- shd->board_info->platform_data = &sdesc->subdev_desc;
+ ssdd = kzalloc(sizeof(*ssdd), GFP_KERNEL);
+ if (!ssdd) {
+ ret = -ENOMEM;
+ goto ealloc;
+ }
+
+ memcpy(ssdd, &sdesc->subdev_desc, sizeof(*ssdd));
+ /*
+ * In synchronous case we request regulators ourselves in
+ * soc_camera_pdrv_probe(), make sure the subdevice driver doesn't try
+ * to allocate them again.
+ */
+ ssdd->num_regulators = 0;
+ ssdd->regulators = NULL;
+ shd->board_info->platform_data = ssdd;
snprintf(clk_name, sizeof(clk_name), "%d-%04x",
shd->i2c_adapter_id, shd->board_info->addr);
@@ -1359,8 +1374,10 @@ static int soc_camera_i2c_init(struct soc_camera_device *icd,
return 0;
ei2cnd:
v4l2_clk_unregister(icd->clk);
-eclkreg:
icd->clk = NULL;
+eclkreg:
+ kfree(ssdd);
+ealloc:
i2c_put_adapter(adap);
return ret;
}
@@ -1370,15 +1387,18 @@ static void soc_camera_i2c_free(struct soc_camera_device *icd)
struct i2c_client *client =
to_i2c_client(to_soc_camera_control(icd));
struct i2c_adapter *adap;
+ struct soc_camera_subdev_desc *ssdd;
icd->control = NULL;
if (icd->sasc)
return;
adap = client->adapter;
+ ssdd = client->dev.platform_data;
v4l2_device_unregister_subdev(i2c_get_clientdata(client));
i2c_unregister_device(client);
i2c_put_adapter(adap);
+ kfree(ssdd);
v4l2_clk_unregister(icd->clk);
icd->clk = NULL;
}
@@ -1995,9 +2015,10 @@ static int soc_camera_pdrv_probe(struct platform_device *pdev)
/*
* In the asynchronous case ssdd->num_regulators == 0 yet, so, the below
- * regulator allocation is a dummy. They will be really requested later
- * in soc_camera_async_bind(). Also note, that in that case regulators
- * are attached to the I2C device and not to the camera platform device.
+ * regulator allocation is a dummy. They are actually requested by the
+ * subdevice driver, using soc_camera_power_init(). Also note, that in
+ * that case regulators are attached to the I2C device and not to the
+ * camera platform device.
*/
ret = devm_regulator_bulk_get(&pdev->dev, ssdd->num_regulators,
ssdd->regulators);