* [PATCH v3 1/3] device property: Introduce fwnode_get_name()
2018-11-26 11:47 [PATCH v3 0/3] device property: Add fwnode_get_name() helper Heikki Krogerus
@ 2018-11-26 11:47 ` Heikki Krogerus
2018-11-26 12:56 ` Andy Shevchenko
2018-11-26 11:47 ` [PATCH v3 2/3] ACPI: property: Add acpi_fwnode_name() Heikki Krogerus
2018-11-26 11:47 ` [PATCH v3 3/3] of/property: Add of_fwnode_name() Heikki Krogerus
2 siblings, 1 reply; 8+ messages in thread
From: Heikki Krogerus @ 2018-11-26 11:47 UTC (permalink / raw)
To: Rafael J. Wysocki
Cc: Mika Westerberg, Andy Shevchenko, Rob Herring, Frank Rowand,
linux-kernel, linux-acpi, devicetree
This helper returns the name of the node. The name is
primarily expected to be returned from a new fwnode
operation meant for this purpose, but when no name is
returned, the helper will also attempt to read a device
property "name".
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
drivers/base/property.c | 26 ++++++++++++++++++++++++++
include/linux/fwnode.h | 3 +++
include/linux/property.h | 2 ++
3 files changed, 31 insertions(+)
diff --git a/drivers/base/property.c b/drivers/base/property.c
index 240ab5230ff6..f4a3270b3de6 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -1156,6 +1156,32 @@ void fwnode_handle_put(struct fwnode_handle *fwnode)
}
EXPORT_SYMBOL_GPL(fwnode_handle_put);
+/**
+ * fwnode_get_name - Read the name of a node
+ * @fwnode: Pointer to the node.
+ * @buf: Buffer where the name is copied to
+ * @len: Size of the buffer
+ *
+ * Reads the node name of @fwnode with get_name fwnode op. If get_name op fails,
+ * the routine attempts to also read a property "name".
+ */
+int fwnode_get_name(const struct fwnode_handle *fwnode, char *buf, size_t len)
+{
+ const char *name;
+ int ret;
+
+ if (!fwnode_call_int_op(fwnode, get_name, buf, len))
+ return 0;
+
+ ret = fwnode_call_int_op(fwnode, property_read_string_array,
+ "name", &name, 1);
+ if (!ret)
+ snprintf(buf, len, "%s", name);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(fwnode_get_name);
+
/**
* fwnode_device_is_available - check if a device is available for use
* @fwnode: Pointer to the fwnode of the device.
diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
index faebf0ca0686..a211b55a5da1 100644
--- a/include/linux/fwnode.h
+++ b/include/linux/fwnode.h
@@ -52,6 +52,7 @@ struct fwnode_reference_args {
* struct fwnode_operations - Operations for fwnode interface
* @get: Get a reference to an fwnode.
* @put: Put a reference to an fwnode.
+ * @get_name: Get the name of an fwnode
* @device_get_match_data: Return the device driver match data.
* @property_present: Return true if a property is present.
* @property_read_integer_array: Read an array of integer properties. Return
@@ -72,6 +73,8 @@ struct fwnode_reference_args {
struct fwnode_operations {
struct fwnode_handle *(*get)(struct fwnode_handle *fwnode);
void (*put)(struct fwnode_handle *fwnode);
+ int (*get_name)(const struct fwnode_handle *fwnode, char *buf,
+ size_t len);
bool (*device_is_available)(const struct fwnode_handle *fwnode);
const void *(*device_get_match_data)(const struct fwnode_handle *fwnode,
const struct device *dev);
diff --git a/include/linux/property.h b/include/linux/property.h
index ac8a1ebc4c1b..e77f08f49c48 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -109,6 +109,8 @@ struct fwnode_handle *device_get_named_child_node(struct device *dev,
struct fwnode_handle *fwnode_handle_get(struct fwnode_handle *fwnode);
void fwnode_handle_put(struct fwnode_handle *fwnode);
+int fwnode_get_name(const struct fwnode_handle *fwnode, char *name, size_t len);
+
int fwnode_irq_get(struct fwnode_handle *fwnode, unsigned int index);
unsigned int device_get_child_node_count(struct device *dev);
--
2.19.1
^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [PATCH v3 1/3] device property: Introduce fwnode_get_name()
2018-11-26 11:47 ` [PATCH v3 1/3] device property: Introduce fwnode_get_name() Heikki Krogerus
@ 2018-11-26 12:56 ` Andy Shevchenko
0 siblings, 0 replies; 8+ messages in thread
From: Andy Shevchenko @ 2018-11-26 12:56 UTC (permalink / raw)
To: Heikki Krogerus
Cc: Rafael J. Wysocki, Mika Westerberg, Rob Herring, Frank Rowand,
linux-kernel, linux-acpi, devicetree
On Mon, Nov 26, 2018 at 02:47:50PM +0300, Heikki Krogerus wrote:
> This helper returns the name of the node. The name is
> primarily expected to be returned from a new fwnode
> operation meant for this purpose, but when no name is
> returned, the helper will also attempt to read a device
> property "name".
> +int fwnode_get_name(const struct fwnode_handle *fwnode, char *buf, size_t len)
> +{
> + const char *name;
> + int ret;
> +
> + if (!fwnode_call_int_op(fwnode, get_name, buf, len))
> + return 0;
> +
> + ret = fwnode_call_int_op(fwnode, property_read_string_array,
> + "name", &name, 1);
> + if (!ret)
> + snprintf(buf, len, "%s", name);
What are we going to do in case snprintf has found no room for entire string?
> +
> + return ret;
> +}
--
With Best Regards,
Andy Shevchenko
^ permalink raw reply [flat|nested] 8+ messages in thread
* [PATCH v3 2/3] ACPI: property: Add acpi_fwnode_name()
2018-11-26 11:47 [PATCH v3 0/3] device property: Add fwnode_get_name() helper Heikki Krogerus
2018-11-26 11:47 ` [PATCH v3 1/3] device property: Introduce fwnode_get_name() Heikki Krogerus
@ 2018-11-26 11:47 ` Heikki Krogerus
2018-11-26 13:04 ` Andy Shevchenko
2018-11-26 11:47 ` [PATCH v3 3/3] of/property: Add of_fwnode_name() Heikki Krogerus
2 siblings, 1 reply; 8+ messages in thread
From: Heikki Krogerus @ 2018-11-26 11:47 UTC (permalink / raw)
To: Rafael J. Wysocki
Cc: Mika Westerberg, Andy Shevchenko, Rob Herring, Frank Rowand,
linux-kernel, linux-acpi, devicetree
This implements the get_name fwnode op for ACPI.
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
drivers/acpi/property.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index 8c7c4583b52d..a38daa6f32cb 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -1219,6 +1219,29 @@ acpi_graph_get_remote_endpoint(const struct fwnode_handle *__fwnode)
return acpi_graph_get_child_prop_value(fwnode, "endpoint", endpoint_nr);
}
+static int
+acpi_fwnode_get_name(const struct fwnode_handle *fwnode, char *buf, size_t len)
+{
+ struct acpi_buffer buffer;
+ acpi_handle handle;
+ acpi_status status;
+
+ if (is_acpi_data_node(fwnode)) {
+ snprintf(buf, len, "%s", to_acpi_data_node(fwnode)->name);
+ return 0;
+ }
+
+ handle = to_acpi_device_node(fwnode)->handle;
+
+ buffer.length = min((size_t)ACPI_NAME_SIZE + 1, len);
+ buffer.pointer = buf;
+
+ status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
+ if (ACPI_FAILURE(status))
+ return -ENXIO;
+ return 0;
+}
+
static bool acpi_fwnode_device_is_available(const struct fwnode_handle *fwnode)
{
if (!is_acpi_device_node(fwnode))
@@ -1310,6 +1333,7 @@ acpi_fwnode_device_get_match_data(const struct fwnode_handle *fwnode,
#define DECLARE_ACPI_FWNODE_OPS(ops) \
const struct fwnode_operations ops = { \
+ .get_name = acpi_fwnode_get_name, \
.device_is_available = acpi_fwnode_device_is_available, \
.device_get_match_data = acpi_fwnode_device_get_match_data, \
.property_present = acpi_fwnode_property_present, \
--
2.19.1
^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [PATCH v3 2/3] ACPI: property: Add acpi_fwnode_name()
2018-11-26 11:47 ` [PATCH v3 2/3] ACPI: property: Add acpi_fwnode_name() Heikki Krogerus
@ 2018-11-26 13:04 ` Andy Shevchenko
0 siblings, 0 replies; 8+ messages in thread
From: Andy Shevchenko @ 2018-11-26 13:04 UTC (permalink / raw)
To: Heikki Krogerus
Cc: Rafael J. Wysocki, Mika Westerberg, Rob Herring, Frank Rowand,
linux-kernel, linux-acpi, devicetree
On Mon, Nov 26, 2018 at 02:47:51PM +0300, Heikki Krogerus wrote:
> This implements the get_name fwnode op for ACPI.
> +static int
> +acpi_fwnode_get_name(const struct fwnode_handle *fwnode, char *buf, size_t len)
> +{
> + struct acpi_buffer buffer;
> + acpi_handle handle;
> + acpi_status status;
> +
> + if (is_acpi_data_node(fwnode)) {
> + snprintf(buf, len, "%s", to_acpi_data_node(fwnode)->name);
Same question as per patch 1. How are we going to handle bigger strings?
> + return 0;
> + }
> +
> + handle = to_acpi_device_node(fwnode)->handle;
> +
> + buffer.length = min((size_t)ACPI_NAME_SIZE + 1, len);
Hmm...
min_t(size_t, ...) ?
> + buffer.pointer = buf;
> +
> + status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
And same question here. Is it possible to get length of the name and check?
Perhaps, I would return -ENAMETOOLONG (-EOVERFLOW) or alike for such cases.
> + if (ACPI_FAILURE(status))
> + return -ENXIO;
> + return 0;
> +}
--
With Best Regards,
Andy Shevchenko
^ permalink raw reply [flat|nested] 8+ messages in thread
* [PATCH v3 3/3] of/property: Add of_fwnode_name()
2018-11-26 11:47 [PATCH v3 0/3] device property: Add fwnode_get_name() helper Heikki Krogerus
2018-11-26 11:47 ` [PATCH v3 1/3] device property: Introduce fwnode_get_name() Heikki Krogerus
2018-11-26 11:47 ` [PATCH v3 2/3] ACPI: property: Add acpi_fwnode_name() Heikki Krogerus
@ 2018-11-26 11:47 ` Heikki Krogerus
2018-11-26 13:05 ` Andy Shevchenko
2 siblings, 1 reply; 8+ messages in thread
From: Heikki Krogerus @ 2018-11-26 11:47 UTC (permalink / raw)
To: Rafael J. Wysocki
Cc: Mika Westerberg, Andy Shevchenko, Rob Herring, Frank Rowand,
linux-kernel, linux-acpi, devicetree
This implements get_name fwnode op for DT.
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
drivers/of/property.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/of/property.c b/drivers/of/property.c
index f46828e3b082..253ed0e9d804 100644
--- a/drivers/of/property.c
+++ b/drivers/of/property.c
@@ -823,6 +823,13 @@ static void of_fwnode_put(struct fwnode_handle *fwnode)
of_node_put(to_of_node(fwnode));
}
+static int of_fwnode_get_name(const struct fwnode_handle *fwnode, char *buf,
+ size_t len)
+{
+ snprintf(buf, len, "%pOFn", to_of_node(fwnode));
+ return 0;
+}
+
static bool of_fwnode_device_is_available(const struct fwnode_handle *fwnode)
{
return of_device_is_available(to_of_node(fwnode));
@@ -987,6 +994,7 @@ of_fwnode_device_get_match_data(const struct fwnode_handle *fwnode,
const struct fwnode_operations of_fwnode_ops = {
.get = of_fwnode_get,
.put = of_fwnode_put,
+ .get_name = of_fwnode_get_name,
.device_is_available = of_fwnode_device_is_available,
.device_get_match_data = of_fwnode_device_get_match_data,
.property_present = of_fwnode_property_present,
--
2.19.1
^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [PATCH v3 3/3] of/property: Add of_fwnode_name()
2018-11-26 11:47 ` [PATCH v3 3/3] of/property: Add of_fwnode_name() Heikki Krogerus
@ 2018-11-26 13:05 ` Andy Shevchenko
2018-11-26 13:40 ` Heikki Krogerus
0 siblings, 1 reply; 8+ messages in thread
From: Andy Shevchenko @ 2018-11-26 13:05 UTC (permalink / raw)
To: Heikki Krogerus
Cc: Rafael J. Wysocki, Mika Westerberg, Rob Herring, Frank Rowand,
linux-kernel, linux-acpi, devicetree
On Mon, Nov 26, 2018 at 02:47:52PM +0300, Heikki Krogerus wrote:
> This implements get_name fwnode op for DT.
> +static int of_fwnode_get_name(const struct fwnode_handle *fwnode, char *buf,
> + size_t len)
> +{
> + snprintf(buf, len, "%pOFn", to_of_node(fwnode));
Same concerns.
> + return 0;
> +}
--
With Best Regards,
Andy Shevchenko
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v3 3/3] of/property: Add of_fwnode_name()
2018-11-26 13:05 ` Andy Shevchenko
@ 2018-11-26 13:40 ` Heikki Krogerus
0 siblings, 0 replies; 8+ messages in thread
From: Heikki Krogerus @ 2018-11-26 13:40 UTC (permalink / raw)
To: Andy Shevchenko
Cc: Rafael J. Wysocki, Mika Westerberg, Rob Herring, Frank Rowand,
linux-kernel, linux-acpi, devicetree
On Mon, Nov 26, 2018 at 03:05:32PM +0200, Andy Shevchenko wrote:
> On Mon, Nov 26, 2018 at 02:47:52PM +0300, Heikki Krogerus wrote:
> > This implements get_name fwnode op for DT.
>
> > +static int of_fwnode_get_name(const struct fwnode_handle *fwnode, char *buf,
> > + size_t len)
> > +{
> > + snprintf(buf, len, "%pOFn", to_of_node(fwnode));
>
> Same concerns.
OK, I'll fix all of these.
thanks,
--
heikki
^ permalink raw reply [flat|nested] 8+ messages in thread