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nvmem: core: add nvmem_device_find 

nvmem_device_find provides a way to search for nvmem devices with
the help of a match function simlair to bus_find_device.

Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Acked-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: linux-rtc@vger.kernel.org
Cc: linux-serial@vger.kernel.org
alistair/sunxi64-5.5-dsi
Thomas Bogendoerfer 2019-10-03 11:52:29 +02:00 committed by Paul Burton
parent 24b0cb4f88
commit 8c2a2b8c2f
No known key found for this signature in database
GPG Key ID: 3EA79FACB57500DD
3 changed files with 38 additions and 34 deletions
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2
Documentation/driver-api/nvmem.rst
View File

@ -129,6 +129,8 @@ To facilitate such consumers NVMEM framework provides below apis::
struct nvmem_device *nvmem_device_get(struct device *dev, const char *name);
struct nvmem_device *devm_nvmem_device_get(struct device *dev,
const char *name);
struct nvmem_device *nvmem_device_find(void *data,
int (*match)(struct device *dev, const void *data));
void nvmem_device_put(struct nvmem_device *nvmem);
int nvmem_device_read(struct nvmem_device *nvmem, unsigned int offset,
size_t bytes, void *buf);

61
drivers/nvmem/core.c
View File

@ -76,33 +76,6 @@ static struct bus_type nvmem_bus_type = {
.name = "nvmem",
};
static struct nvmem_device *of_nvmem_find(struct device_node *nvmem_np)
{
struct device *d;
if (!nvmem_np)
return NULL;
d = bus_find_device_by_of_node(&nvmem_bus_type, nvmem_np);
if (!d)
return NULL;
return to_nvmem_device(d);
}
static struct nvmem_device *nvmem_find(const char *name)
{
struct device *d;
d = bus_find_device_by_name(&nvmem_bus_type, NULL, name);
if (!d)
return NULL;
return to_nvmem_device(d);
}
static void nvmem_cell_drop(struct nvmem_cell *cell)
{
blocking_notifier_call_chain(&nvmem_notifier, NVMEM_CELL_REMOVE, cell);
@ -532,13 +505,16 @@ int devm_nvmem_unregister(struct device *dev, struct nvmem_device *nvmem)
}
EXPORT_SYMBOL(devm_nvmem_unregister);
static struct nvmem_device *__nvmem_device_get(struct device_node *np,
const char *nvmem_name)
static struct nvmem_device *__nvmem_device_get(void *data,
int (*match)(struct device *dev, const void *data))
{
struct nvmem_device *nvmem = NULL;
struct device *dev;
mutex_lock(&nvmem_mutex);
nvmem = np ? of_nvmem_find(np) : nvmem_find(nvmem_name);
dev = bus_find_device(&nvmem_bus_type, NULL, data, match);
if (dev)
nvmem = to_nvmem_device(dev);
mutex_unlock(&nvmem_mutex);
if (!nvmem)
return ERR_PTR(-EPROBE_DEFER);
@ -587,7 +563,7 @@ struct nvmem_device *of_nvmem_device_get(struct device_node *np, const char *id)
if (!nvmem_np)
return ERR_PTR(-ENOENT);
return __nvmem_device_get(nvmem_np, NULL);
return __nvmem_device_get(nvmem_np, device_match_of_node);
}
EXPORT_SYMBOL_GPL(of_nvmem_device_get);
#endif
@ -613,10 +589,26 @@ struct nvmem_device *nvmem_device_get(struct device *dev, const char *dev_name)
}
return __nvmem_device_get(NULL, dev_name);
return __nvmem_device_get((void *)dev_name, device_match_name);
}
EXPORT_SYMBOL_GPL(nvmem_device_get);
/**
* nvmem_device_find() - Find nvmem device with matching function
*
* @data: Data to pass to match function
* @match: Callback function to check device
*
* Return: ERR_PTR() on error or a valid pointer to a struct nvmem_device
* on success.
*/
struct nvmem_device *nvmem_device_find(void *data,
int (*match)(struct device *dev, const void *data))
{
return __nvmem_device_get(data, match);
}
EXPORT_SYMBOL_GPL(nvmem_device_find);
static int devm_nvmem_device_match(struct device *dev, void *res, void *data)
{
struct nvmem_device **nvmem = res;
@ -710,7 +702,8 @@ nvmem_cell_get_from_lookup(struct device *dev, const char *con_id)
if ((strcmp(lookup->dev_id, dev_id) == 0) &&
(strcmp(lookup->con_id, con_id) == 0)) {
/* This is the right entry. */
nvmem = __nvmem_device_get(NULL, lookup->nvmem_name);
nvmem = __nvmem_device_get((void *)lookup->nvmem_name,
device_match_name);
if (IS_ERR(nvmem)) {
/* Provider may not be registered yet. */
cell = ERR_CAST(nvmem);
@ -780,7 +773,7 @@ struct nvmem_cell *of_nvmem_cell_get(struct device_node *np, const char *id)
if (!nvmem_np)
return ERR_PTR(-EINVAL);
nvmem = __nvmem_device_get(nvmem_np, NULL);
nvmem = __nvmem_device_get(nvmem_np, device_match_of_node);
of_node_put(nvmem_np);
if (IS_ERR(nvmem))
return ERR_CAST(nvmem);

9
include/linux/nvmem-consumer.h
View File

@ -89,6 +89,9 @@ void nvmem_del_cell_lookups(struct nvmem_cell_lookup *entries,
int nvmem_register_notifier(struct notifier_block *nb);
int nvmem_unregister_notifier(struct notifier_block *nb);
struct nvmem_device *nvmem_device_find(void *data,
int (*match)(struct device *dev, const void *data));
#else
static inline struct nvmem_cell *nvmem_cell_get(struct device *dev,
@ -204,6 +207,12 @@ static inline int nvmem_unregister_notifier(struct notifier_block *nb)
return -EOPNOTSUPP;
}
static inline struct nvmem_device *nvmem_device_find(void *data,
int (*match)(struct device *dev, const void *data))
{
return NULL;
}
#endif /* CONFIG_NVMEM */
#if IS_ENABLED(CONFIG_NVMEM) && IS_ENABLED(CONFIG_OF)