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path: root/drivers/media/video/v4l2-common.c
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Diffstat (limited to 'drivers/media/video/v4l2-common.c')
-rw-r--r--drivers/media/video/v4l2-common.c181
1 files changed, 180 insertions, 1 deletions
diff --git a/drivers/media/video/v4l2-common.c b/drivers/media/video/v4l2-common.c
index f96475626da7..b91d66a767d7 100644
--- a/drivers/media/video/v4l2-common.c
+++ b/drivers/media/video/v4l2-common.c
@@ -802,6 +802,17 @@ struct v4l2_subdev *v4l2_i2c_new_subdev(struct v4l2_device *v4l2_dev,
/* Decrease the module use count to match the first try_module_get. */
module_put(client->driver->driver.owner);
+ if (sd) {
+ /* We return errors from v4l2_subdev_call only if we have the
+ callback as the .s_config is not mandatory */
+ int err = v4l2_subdev_call(sd, core, s_config, 0, NULL);
+
+ if (err && err != -ENOIOCTLCMD) {
+ v4l2_device_unregister_subdev(sd);
+ sd = NULL;
+ }
+ }
+
error:
/* If we have a client but no subdev, then something went wrong and
we must unregister the client. */
@@ -852,6 +863,17 @@ struct v4l2_subdev *v4l2_i2c_new_probed_subdev(struct v4l2_device *v4l2_dev,
/* Decrease the module use count to match the first try_module_get. */
module_put(client->driver->driver.owner);
+ if (sd) {
+ /* We return errors from v4l2_subdev_call only if we have the
+ callback as the .s_config is not mandatory */
+ int err = v4l2_subdev_call(sd, core, s_config, 0, NULL);
+
+ if (err && err != -ENOIOCTLCMD) {
+ v4l2_device_unregister_subdev(sd);
+ sd = NULL;
+ }
+ }
+
error:
/* If we have a client but no subdev, then something went wrong and
we must unregister the client. */
@@ -872,6 +894,89 @@ struct v4l2_subdev *v4l2_i2c_new_probed_subdev_addr(struct v4l2_device *v4l2_dev
}
EXPORT_SYMBOL_GPL(v4l2_i2c_new_probed_subdev_addr);
+/* Load an i2c sub-device. */
+struct v4l2_subdev *v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev,
+ struct i2c_adapter *adapter, const char *module_name,
+ struct i2c_board_info *info, const unsigned short *probe_addrs)
+{
+ struct v4l2_subdev *sd = NULL;
+ struct i2c_client *client;
+
+ BUG_ON(!v4l2_dev);
+
+ if (module_name)
+ request_module(module_name);
+
+ /* Create the i2c client */
+ if (info->addr == 0 && probe_addrs)
+ client = i2c_new_probed_device(adapter, info, probe_addrs);
+ else
+ client = i2c_new_device(adapter, info);
+
+ /* Note: by loading the module first we are certain that c->driver
+ will be set if the driver was found. If the module was not loaded
+ first, then the i2c core tries to delay-load the module for us,
+ and then c->driver is still NULL until the module is finally
+ loaded. This delay-load mechanism doesn't work if other drivers
+ want to use the i2c device, so explicitly loading the module
+ is the best alternative. */
+ if (client == NULL || client->driver == NULL)
+ goto error;
+
+ /* Lock the module so we can safely get the v4l2_subdev pointer */
+ if (!try_module_get(client->driver->driver.owner))
+ goto error;
+ sd = i2c_get_clientdata(client);
+
+ /* Register with the v4l2_device which increases the module's
+ use count as well. */
+ if (v4l2_device_register_subdev(v4l2_dev, sd))
+ sd = NULL;
+ /* Decrease the module use count to match the first try_module_get. */
+ module_put(client->driver->driver.owner);
+
+ if (sd) {
+ /* We return errors from v4l2_subdev_call only if we have the
+ callback as the .s_config is not mandatory */
+ int err = v4l2_subdev_call(sd, core, s_config,
+ info->irq, info->platform_data);
+
+ if (err && err != -ENOIOCTLCMD) {
+ v4l2_device_unregister_subdev(sd);
+ sd = NULL;
+ }
+ }
+
+error:
+ /* If we have a client but no subdev, then something went wrong and
+ we must unregister the client. */
+ if (client && sd == NULL)
+ i2c_unregister_device(client);
+ return sd;
+}
+EXPORT_SYMBOL_GPL(v4l2_i2c_new_subdev_board);
+
+struct v4l2_subdev *v4l2_i2c_new_subdev_cfg(struct v4l2_device *v4l2_dev,
+ struct i2c_adapter *adapter,
+ const char *module_name, const char *client_type,
+ int irq, void *platform_data,
+ u8 addr, const unsigned short *probe_addrs)
+{
+ struct i2c_board_info info;
+
+ /* Setup the i2c board info with the device type and
+ the device address. */
+ memset(&info, 0, sizeof(info));
+ strlcpy(info.type, client_type, sizeof(info.type));
+ info.addr = addr;
+ info.irq = irq;
+ info.platform_data = platform_data;
+
+ return v4l2_i2c_new_subdev_board(v4l2_dev, adapter, module_name,
+ &info, probe_addrs);
+}
+EXPORT_SYMBOL_GPL(v4l2_i2c_new_subdev_cfg);
+
/* Return i2c client address of v4l2_subdev. */
unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd)
{
@@ -916,4 +1021,78 @@ const unsigned short *v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type)
}
EXPORT_SYMBOL_GPL(v4l2_i2c_tuner_addrs);
-#endif
+#endif /* defined(CONFIG_I2C) */
+
+/* Clamp x to be between min and max, aligned to a multiple of 2^align. min
+ * and max don't have to be aligned, but there must be at least one valid
+ * value. E.g., min=17,max=31,align=4 is not allowed as there are no multiples
+ * of 16 between 17 and 31. */
+static unsigned int clamp_align(unsigned int x, unsigned int min,
+ unsigned int max, unsigned int align)
+{
+ /* Bits that must be zero to be aligned */
+ unsigned int mask = ~((1 << align) - 1);
+
+ /* Round to nearest aligned value */
+ if (align)
+ x = (x + (1 << (align - 1))) & mask;
+
+ /* Clamp to aligned value of min and max */
+ if (x < min)
+ x = (min + ~mask) & mask;
+ else if (x > max)
+ x = max & mask;
+
+ return x;
+}
+
+/* Bound an image to have a width between wmin and wmax, and height between
+ * hmin and hmax, inclusive. Additionally, the width will be a multiple of
+ * 2^walign, the height will be a multiple of 2^halign, and the overall size
+ * (width*height) will be a multiple of 2^salign. The image may be shrunk
+ * or enlarged to fit the alignment constraints.
+ *
+ * The width or height maximum must not be smaller than the corresponding
+ * minimum. The alignments must not be so high there are no possible image
+ * sizes within the allowed bounds. wmin and hmin must be at least 1
+ * (don't use 0). If you don't care about a certain alignment, specify 0,
+ * as 2^0 is 1 and one byte alignment is equivalent to no alignment. If
+ * you only want to adjust downward, specify a maximum that's the same as
+ * the initial value.
+ */
+void v4l_bound_align_image(u32 *w, unsigned int wmin, unsigned int wmax,
+ unsigned int walign,
+ u32 *h, unsigned int hmin, unsigned int hmax,
+ unsigned int halign, unsigned int salign)
+{
+ *w = clamp_align(*w, wmin, wmax, walign);
+ *h = clamp_align(*h, hmin, hmax, halign);
+
+ /* Usually we don't need to align the size and are done now. */
+ if (!salign)
+ return;
+
+ /* How much alignment do we have? */
+ walign = __ffs(*w);
+ halign = __ffs(*h);
+ /* Enough to satisfy the image alignment? */
+ if (walign + halign < salign) {
+ /* Max walign where there is still a valid width */
+ unsigned int wmaxa = __fls(wmax ^ (wmin - 1));
+ /* Max halign where there is still a valid height */
+ unsigned int hmaxa = __fls(hmax ^ (hmin - 1));
+
+ /* up the smaller alignment until we have enough */
+ do {
+ if (halign >= hmaxa ||
+ (walign <= halign && walign < wmaxa)) {
+ *w = clamp_align(*w, wmin, wmax, walign + 1);
+ walign = __ffs(*w);
+ } else {
+ *h = clamp_align(*h, hmin, hmax, halign + 1);
+ halign = __ffs(*h);
+ }
+ } while (halign + walign < salign);
+ }
+}
+EXPORT_SYMBOL_GPL(v4l_bound_align_image);