On Mon, Feb 24, 2014 at 10:19 PM, Guennadi Liakhovetski
<g.liakhovetski@xxxxxx> wrote:
> Hi Bryan,
>
> On Mon, 24 Feb 2014, Bryan Wu wrote:
>
>> On Tue, Feb 18, 2014 at 10:40 AM, Bryan Wu <cooloney@xxxxxxxxx> wrote:
>> > On Wed, Feb 12, 2014 at 12:05 PM, Bryan Wu <cooloney@xxxxxxxxx> wrote:
>> >> From: Guennadi Liakhovetski <g.liakhovetski@xxxxxx>
>> >>
>> >> With OF we aren't getting platform data any more. To minimise changes we
>> >> create all the missing data ourselves, including compulsory struct
>> >> soc_camera_link objects. Host-client linking is now done, based on the OF
>> >> data. Media bus numbers also have to be assigned dynamically.
>> >>
>> >> OF probing reuses the V4L2 Async API which is used by async non-OF probing.
>> >>
>> >> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@xxxxxx>
>> >
>> > Hi Guennadi,
>> >
>> > Do you have chance to review my v2 patch?
>
> I looked at it briefly, the direction looks good now, but I'll have to
> find time to properly review it.
>
Hi Guennadi,
Do you have chance to review this patch?
Thanks,
-Bryan
>
>> >> Signed-off-by: Bryan Wu <pengw@xxxxxxxxxx>
>> >> ---
>> >> v2:
>> >> - move to use V4L2 Async API
>> >> - cleanup some coding style issue
>> >> - allocate struct soc_camera_desc sdesc on stack
>> >> - cleanup unbalanced mutex operation
>> >>
>> >> drivers/media/platform/soc_camera/soc_camera.c | 232 ++++++++++++++++++++++++-
>> >> include/media/soc_camera.h | 5 +
>> >> 2 files changed, 233 insertions(+), 4 deletions(-)
>> >>
>> >> diff --git a/drivers/media/platform/soc_camera/soc_camera.c b/drivers/media/platform/soc_camera/soc_camera.c
>> >> index 4b8c024..ffe1254 100644
>> >> --- a/drivers/media/platform/soc_camera/soc_camera.c
>> >> +++ b/drivers/media/platform/soc_camera/soc_camera.c
>> >> @@ -23,6 +23,7 @@
>> >> #include <linux/list.h>
>> >> #include <linux/module.h>
>> >> #include <linux/mutex.h>
>> >> +#include <linux/of.h>
>> >> #include <linux/platform_device.h>
>> >> #include <linux/pm_runtime.h>
>> >> #include <linux/regulator/consumer.h>
>> >> @@ -36,6 +37,7 @@
>> >> #include <media/v4l2-common.h>
>> >> #include <media/v4l2-ioctl.h>
>> >> #include <media/v4l2-dev.h>
>> >> +#include <media/v4l2-of.h>
>> >> #include <media/videobuf-core.h>
>> >> #include <media/videobuf2-core.h>
>> >>
>> >> @@ -49,6 +51,7 @@
>> >> vb2_is_streaming(&(icd)->vb2_vidq))
>> >>
>> >> #define MAP_MAX_NUM 32
>> >> +static DECLARE_BITMAP(host_map, MAP_MAX_NUM);
>> >> static DECLARE_BITMAP(device_map, MAP_MAX_NUM);
>> >> static LIST_HEAD(hosts);
>> >> static LIST_HEAD(devices);
>> >> @@ -65,6 +68,17 @@ struct soc_camera_async_client {
>> >> struct list_head list; /* needed for clean up */
>> >> };
>> >>
>> >> +struct soc_camera_of_client {
>> >> + struct soc_camera_desc *sdesc;
>> >> + struct soc_camera_async_client sasc;
>> >> + struct v4l2_of_endpoint node;
>> >> + struct dev_archdata archdata;
>> >> + struct device_node *link_node;
>> >> + union {
>> >> + struct i2c_board_info i2c_info;
>> >> + };
>> >> +};
>> >> +
>> >> static int soc_camera_video_start(struct soc_camera_device *icd);
>> >> static int video_dev_create(struct soc_camera_device *icd);
>> >>
>> >> @@ -1336,6 +1350,10 @@ static int soc_camera_i2c_init(struct soc_camera_device *icd,
>> >> return -EPROBE_DEFER;
>> >> }
>> >>
>> >> + /* OF probing skips following I2C init */
>> >> + if (shd->host_wait)
>> >> + return 0;
>> >> +
>> >> ici = to_soc_camera_host(icd->parent);
>> >> adap = i2c_get_adapter(shd->i2c_adapter_id);
>> >> if (!adap) {
>> >> @@ -1573,10 +1591,180 @@ static void scan_async_host(struct soc_camera_host *ici)
>> >> asd += ici->asd_sizes[j];
>> >> }
>> >> }
>> >> +
>> >> +static void soc_camera_of_i2c_ifill(struct soc_camera_of_client *sofc,
>> >> + struct i2c_client *client)
>> >> +{
>> >> + struct i2c_board_info *info = &sofc->i2c_info;
>> >> + struct soc_camera_desc *sdesc = sofc->sdesc;
>> >> +
>> >> + /* on OF I2C devices platform_data == NULL */
>> >> + info->flags = client->flags;
>> >> + info->addr = client->addr;
>> >> + info->irq = client->irq;
>> >> + info->archdata = &sofc->archdata;
>> >> +
>> >> + /* archdata is always empty on OF I2C devices */
>> >> + strlcpy(info->type, client->name, sizeof(info->type));
>> >> +
>> >> + sdesc->host_desc.i2c_adapter_id = client->adapter->nr;
>> >> +}
>> >> +
>> >> +static void soc_camera_of_i2c_info(struct device_node *node,
>> >> + struct soc_camera_of_client *sofc)
>> >> +{
>> >> + struct i2c_client *client;
>> >> + struct soc_camera_desc *sdesc = sofc->sdesc;
>> >> + struct i2c_board_info *info = &sofc->i2c_info;
>> >> + struct device_node *port, *sensor, *bus;
>> >> +
>> >> + port = v4l2_of_get_remote_port(node);
>> >> + if (!port)
>> >> + return;
>> >> +
>> >> + /* Check the bus */
>> >> + sensor = of_get_parent(port);
>> >> + bus = of_get_parent(sensor);
>> >> +
>> >> + if (of_node_cmp(bus->name, "i2c")) {
>> >> + of_node_put(port);
>> >> + of_node_put(sensor);
>> >> + of_node_put(bus);
>> >> + return;
>> >> + }
>> >> +
>> >> + info->of_node = sensor;
>> >> + sdesc->host_desc.board_info = info;
>> >> +
>> >> + client = of_find_i2c_device_by_node(sensor);
>> >> + /*
>> >> + * of_i2c_register_devices() took a reference to the OF node, it is not
>> >> + * dropped, when the I2C device is removed, so, we don't need an
>> >> + * additional reference.
>> >> + */
>> >> + of_node_put(sensor);
>> >> + if (client) {
>> >> + soc_camera_of_i2c_ifill(sofc, client);
>> >> + sofc->link_node = sensor;
>> >> + put_device(&client->dev);
>> >> + }
>> >> +
>> >> + /* client hasn't attached to I2C yet */
>> >> +}
>> >> +
>> >> +static struct soc_camera_of_client *soc_camera_of_alloc_client(const struct soc_camera_host *ici,
>> >> + struct device_node *node)
>> >> +{
>> >> + struct soc_camera_of_client *sofc;
>> >> + struct v4l2_async_subdev *sensor;
>> >> + struct soc_camera_desc sdesc = { .host_desc.host_wait = true,};
>> >> + int i, ret;
>> >> +
>> >> + sofc = devm_kzalloc(ici->v4l2_dev.dev, sizeof(*sofc), GFP_KERNEL);
>> >> + if (!sofc)
>> >> + return NULL;
>> >> +
>> >> + /* Allocate v4l2_async_subdev by ourselves */
>> >> + sensor = devm_kzalloc(ici->v4l2_dev.dev, sizeof(*sensor), GFP_KERNEL);
>> >> + if (!sensor)
>> >> + return NULL;
>> >> + sofc->sasc.sensor = sensor;
>> >> +
>> >> + mutex_lock(&list_lock);
>> >> + i = find_first_zero_bit(device_map, MAP_MAX_NUM);
>> >> + if (i < MAP_MAX_NUM)
>> >> + set_bit(i, device_map);
>> >> + mutex_unlock(&list_lock);
>> >> + if (i >= MAP_MAX_NUM)
>> >> + return NULL;
>> >> + sofc->sasc.pdev = platform_device_alloc("soc-camera-pdrv", i);
>> >> + if (!sofc->sasc.pdev)
>> >> + return NULL;
>> >> +
>> >> + sdesc.host_desc.node = &sofc->node;
>> >> + sdesc.host_desc.bus_id = ici->nr;
>> >> +
>> >> + ret = platform_device_add_data(sofc->sasc.pdev, &sdesc, sizeof(sdesc));
>> >> + if (ret < 0)
>> >> + return NULL;
>> >> + sofc->sdesc = sofc->sasc.pdev->dev.platform_data;
>> >> +
>> >> + soc_camera_of_i2c_info(node, sofc);
>> >> +
>> >> + return sofc;
>> >> +}
>> >> +
>> >> +static void scan_of_host(struct soc_camera_host *ici)
>> >> +{
>> >> + struct soc_camera_of_client *sofc;
>> >> + struct soc_camera_async_client *sasc;
>> >> + struct v4l2_async_subdev *asd;
>> >> + struct soc_camera_device *icd;
>> >> + struct device_node *node = NULL;
>> >> +
>> >> + for (;;) {
>> >> + int ret;
>> >> +
>> >> + node = v4l2_of_get_next_endpoint(ici->v4l2_dev.dev->of_node,
>> >> + node);
>> >> + if (!node)
>> >> + break;
>> >> +
>> >> + sofc = soc_camera_of_alloc_client(ici, node);
>> >> + if (!sofc) {
>> >> + dev_err(ici->v4l2_dev.dev,
>> >> + "%s(): failed to create a client device\n",
>> >> + __func__);
>> >> + of_node_put(node);
>> >> + break;
>> >> + }
>> >> + v4l2_of_parse_endpoint(node, &sofc->node);
>> >> +
>> >> + sasc = &sofc->sasc;
>> >> + ret = platform_device_add(sasc->pdev);
>> >> + if (ret < 0) {
>> >> + /* Useless thing, but keep trying */
>> >> + platform_device_put(sasc->pdev);
>> >> + of_node_put(node);
>> >> + continue;
>> >> + }
>> >> +
>> >> + /* soc_camera_pdrv_probe() probed successfully */
>> >> + icd = platform_get_drvdata(sasc->pdev);
>> >> + if (!icd) {
>> >> + /* Cannot be... */
>> >> + platform_device_put(sasc->pdev);
>> >> + of_node_put(node);
>> >> + continue;
>> >> + }
>> >> +
>> >> + asd = sasc->sensor;
>> >> + asd->match_type = V4L2_ASYNC_MATCH_OF;
>> >> + asd->match.of.node = sofc->link_node;
>> >> +
>> >> + sasc->notifier.subdevs = &asd;
>> >> + sasc->notifier.num_subdevs = 1;
>> >> + sasc->notifier.bound = soc_camera_async_bound;
>> >> + sasc->notifier.unbind = soc_camera_async_unbind;
>> >> + sasc->notifier.complete = soc_camera_async_complete;
>> >> +
>> >> + icd->parent = ici->v4l2_dev.dev;
>> >> +
>> >> + ret = v4l2_async_notifier_register(&ici->v4l2_dev, &sasc->notifier);
>> >> + if (!ret)
>> >> + sjUmBMDe3fq35HMObreak;
>> >> +
>> >> + /*
>> >> + * We could destroy the icd in there error case here, but the
>> >> + * non-OF version doesn't do that, so, we can keep it around too
>> >> + */
>> >> + }
>> >> +}
>> >> #else
>> >> #define soc_camera_i2c_init(icd, sdesc) (-ENODEV)
>> >> #define soc_camera_i2c_free(icd) do {} while (0)
>> >> #define scan_async_host(ici) do {} while (0)
>> >> +#define scan_of_host(ici) do {} while (0)
>> >> #endif
>> >>
>> >> /* Called during host-driver probe */
>> >> @@ -1689,6 +1877,7 @@ static int soc_camera_remove(struct soc_camera_device *icd)
>> >> {
>> >> struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
>> >> struct video_device *vdev = icd->vdev;
>> >> + struct v4l2_of_endpoint *node = sdesc->host_desc.node;
>> >>
>> >> v4l2_ctrl_handler_free(&icd->ctrl_handler);
>> >> if (vdev) {
>> >> @@ -1719,6 +1908,17 @@ static int soc_camera_remove(struct soc_camera_device *icd)
>> >> if (icd->sasc)
>> >> platform_device_unregister(icd->sasc->pdev);
>> >>
>> >> + if (node) {
>> >> + struct soc_camera_of_client *sofc = container_of(node,
>> >> + struct soc_camera_of_client, node);
>> >> + /* Don't dead-lock: remove the device here under the lock */
>> >> + clear_bit(sofc->sasc.pdev->id, device_map);
>> >> + list_del(&icd->list);
>> >> + if (sofc->link_node)
>> >> + of_node_put(sofc->link_node);
>> >> + platform_device_unregister(sofc->sasc.pdev);
>> >> + }
>> >> +
>> >> return 0;
>> >> }
>> >>
>> >> @@ -1813,17 +2013,34 @@ int soc_camera_host_register(struct soc_camera_host *ici)
>> >> ici->ops->enum_framesizes = default_enum_framesizes;
>> >>
>> >> mutex_lock(&list_lock);
>> >> - list_for_each_entry(ix, &hosts, list) {
>> >> - if (ix->nr == ici->nr) {
>> >> + if (ici->nr == (unsigned char)-1) {
>> >> + /* E.g. OF host: dynamic number */
>> >> + /* TODO: consider using IDR */
>> >> + ici->nr = find_first_zero_bit(host_map, MAP_MAX_NUM);
>> >> + if (ici->nr >= MAP_MAX_NUM) {
>> >> ret = -EBUSY;
>> >> goto edevreg;
>> >> }
>> >> + } else {
>> >> + if (ici->nr >= MAP_MAX_NUM) {
>> >> + ret = -EINVAL;
>> >> + goto edevreg;
>> >> + }
>> >> +
>> >> + list_for_each_entry(ix, &hosts, list) {
>> >> + if (ix->nr == ici->nr) {
>> >> + ret = -EBUSY;
>> >> + goto edevreg;
>> >> + }
>> >> + }
>> >> }
>> >>
>> >> ret = v4l2_device_register(ici->v4l2_dev.dev, &ici->v4l2_dev);
>> >> if (ret < 0)
>> >> goto edevreg;
>> >>
>> >> + set_bit(ici->nr, host_map);
>> >> +
>> >> list_add_tail(&ici->list, &hosts);
>> >> mutex_unlock(&list_lock);
>> >>
>> >> @@ -1837,9 +2054,11 @@ int soc_camera_host_register(struct soc_camera_host *ici)
>> >> * dynamically!
>> >> */
>> >> scan_async_host(ici);
>> >> - else
>> >> + else if (!ici->v4l2_dev.dev->of_node)
>> >> /* Legacy: static platform devices from board data */
>> >> scan_add_host(ici);
>> >> + else /* Scan subdevices from OF info */
>> >> + scan_of_host(ici);
>> >>
>> >> return 0;
>> >>
>> >> @@ -1857,6 +2076,8 @@ void soc_camera_host_unregister(struct soc_camera_host *ici)
>> >> LIST_HEAD(notifiers);
>> >>
>> >> mutex_lock(&list_lock);
>> >> +
>> >> + clear_bit(ici->nr, host_map);
>> >> list_del(&ici->list);
>> >> list_for_each_entry(icd, &devices, list)
>> >> if (icd->iface == ici->nr && icd->sasc) {
>> >> @@ -1875,7 +2096,10 @@ void soc_camera_host_unregister(struct soc_camera_host *ici)
>> >> mutex_lock(&list_lock);
>> >>
>> >> list_for_each_entry_safe(icd, tmp, &devices, list)
>> >> - if (icd->iface == ici->nr)
>> >> + if (icd->iface == ici->nr &&
>> >> + icd->parent == ici->v4l2_dev.dev &&
>> >> + (to_soc_camera_control(icd) ||
>> >> + icd->sdesc->host_desc.host_wait))
>> >> soc_camera_remove(icd);
>> >>
>> >> mutex_unlock(&list_lock);
>> >> diff --git a/include/media/soc_camera.h b/include/media/soc_camera.h
>> >> index 865246b..06b03b1 100644
>> >> --- a/include/media/soc_camera.h
>> >> +++ b/include/media/soc_camera.h
>> >> @@ -138,6 +138,7 @@ struct soc_camera_host_ops {
>> >>
>> >> struct i2c_board_info;
>> >> struct regulator_bulk_data;
>> >> +struct v4l2_of_endpoint;
>> >>
>> >> struct soc_camera_subdev_desc {
>> >> /* Per camera SOCAM_SENSOR_* bus flags */
>> >> @@ -177,7 +178,9 @@ struct soc_camera_host_desc {
>> >> int bus_id;
>> >> int i2c_adapter_id;
>> >> struct i2c_board_info *board_info;
>> >> + struct v4l2_of_endpoint *node;
>> >> const char *module_name;
>> >> + bool host_wait;
>> >>
>> >> /*
>> >> * For non-I2C devices platform has to provide methods to add a device
>> >> @@ -242,7 +245,9 @@ struct soc_camera_link {
>> >> int bus_id;
>> >> int i2c_adapter_id;
>> >> struct i2c_board_info *board_info;
>> >> + struct v4l2_of_endpoint *node;
>> >> const char *module_name;
>> >> + bool host_wait;
>> >>
>> >> /*
>> >> * For non-I2C devices platform has to provide methods to add a device
>> >> --
>> >> 1.8.3.2
>> >>
>>
>>
>> I have to ping it again.
>>
>> -Bryan
>>
>
> ---
> Guennadi Liakhovetski, Ph.D.
> Freelance Open-Source Software Developer
> http://www.open-technology.de/
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