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drm/mipi-dsi: Create devm device registration

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Devices that take their data through the MIPI-DSI bus but are controlled
through a secondary bus like I2C have to register a secondary device on
the MIPI-DSI bus through the mipi_dsi_device_register_full() function.

At removal or when an error occurs, that device needs to be removed
through a call to mipi_dsi_device_unregister().

Let's create a device-managed variant of the registration function that
will automatically unregister the device at unbind.

Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20210910101218.1632297-4-maxime@cerno.tech
This commit is contained in:
Maxime Ripard 2021-09-10 12:11:57 +02:00
parent 209264a857
commit a1419fb4a7
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GPG Key ID: E3EF0D6F671851C5
2 changed files with 49 additions and 0 deletions
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46
drivers/gpu/drm/drm_mipi_dsi.c
View File

@ -246,6 +246,52 @@ void mipi_dsi_device_unregister(struct mipi_dsi_device *dsi)
}
EXPORT_SYMBOL(mipi_dsi_device_unregister);
static void devm_mipi_dsi_device_unregister(void *arg)
{
struct mipi_dsi_device *dsi = arg;
mipi_dsi_device_unregister(dsi);
}
/**
* devm_mipi_dsi_device_register_full - create a managed MIPI DSI device
* @dev: device to tie the MIPI-DSI device lifetime to
* @host: DSI host to which this device is connected
* @info: pointer to template containing DSI device information
*
* Create a MIPI DSI device by using the device information provided by
* mipi_dsi_device_info template
*
* This is the managed version of mipi_dsi_device_register_full() which
* automatically calls mipi_dsi_device_unregister() when @dev is
* unbound.
*
* Returns:
* A pointer to the newly created MIPI DSI device, or, a pointer encoded
* with an error
*/
struct mipi_dsi_device *
devm_mipi_dsi_device_register_full(struct device *dev,
struct mipi_dsi_host *host,
const struct mipi_dsi_device_info *info)
{
struct mipi_dsi_device *dsi;
int ret;
dsi = mipi_dsi_device_register_full(host, info);
if (IS_ERR(dsi))
return dsi;
ret = devm_add_action_or_reset(dev,
devm_mipi_dsi_device_unregister,
dsi);
if (ret)
return ERR_PTR(ret);
return dsi;
}
EXPORT_SYMBOL_GPL(devm_mipi_dsi_device_register_full);
static DEFINE_MUTEX(host_lock);
static LIST_HEAD(host_list);

3
include/drm/drm_mipi_dsi.h
View File

@ -227,6 +227,9 @@ struct mipi_dsi_device *
mipi_dsi_device_register_full(struct mipi_dsi_host *host,
const struct mipi_dsi_device_info *info);
void mipi_dsi_device_unregister(struct mipi_dsi_device *dsi);
struct mipi_dsi_device *
devm_mipi_dsi_device_register_full(struct device *dev, struct mipi_dsi_host *host,
const struct mipi_dsi_device_info *info);
struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np);
int mipi_dsi_attach(struct mipi_dsi_device *dsi);
int mipi_dsi_detach(struct mipi_dsi_device *dsi);