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soundwire: master: add sysfs support

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Add the master properties as attributes. The description is directly
derived from the MIPI DisCo specification.

Credits: this patch is based on an earlier internal contribution by
Vinod Koul, Sanyog Kale, Shreyas Nc and Hardik Shah.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20200518203551.2053-3-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2020-05-19 04:35:50 +08:00 committed by Vinod Koul
parent 6bf393c577
commit c5778ca49a
2 changed files with 107 additions and 0 deletions
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23
Documentation/ABI/testing/sysfs-bus-soundwire-master Normal file
View File

@ -0,0 +1,23 @@
What: /sys/bus/soundwire/devices/sdw-master-N/revision
/sys/bus/soundwire/devices/sdw-master-N/clk_stop_modes
/sys/bus/soundwire/devices/sdw-master-N/clk_freq
/sys/bus/soundwire/devices/sdw-master-N/clk_gears
/sys/bus/soundwire/devices/sdw-master-N/default_col
/sys/bus/soundwire/devices/sdw-master-N/default_frame_rate
/sys/bus/soundwire/devices/sdw-master-N/default_row
/sys/bus/soundwire/devices/sdw-master-N/dynamic_shape
/sys/bus/soundwire/devices/sdw-master-N/err_threshold
/sys/bus/soundwire/devices/sdw-master-N/max_clk_freq
Date: April 2020
Contact: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Bard Liao <yung-chuan.liao@linux.intel.com>
Vinod Koul <vkoul@kernel.org>
Description: SoundWire Master-N DisCo properties.
These properties are defined by MIPI DisCo Specification
for SoundWire. They define various properties of the Master
and are used by the bus to configure the Master. clk_stop_modes
is a bitmask for simplifications and combines the
clock-stop-mode0 and clock-stop-mode1 properties.

84
drivers/soundwire/master.c
View File

@ -8,6 +8,89 @@
#include <linux/soundwire/sdw_type.h>
#include "bus.h"
/*
* The sysfs for properties reflects the MIPI description as given
* in the MIPI DisCo spec
*
* Base file is:
* sdw-master-N
* |---- revision
* |---- clk_stop_modes
* |---- max_clk_freq
* |---- clk_freq
* |---- clk_gears
* |---- default_row
* |---- default_col
* |---- dynamic_shape
* |---- err_threshold
*/
#define sdw_master_attr(field, format_string) \
static ssize_t field##_show(struct device *dev, \
struct device_attribute *attr, \
char *buf) \
{ \
struct sdw_master_device *md = dev_to_sdw_master_device(dev); \
return sprintf(buf, format_string, md->bus->prop.field); \
} \
static DEVICE_ATTR_RO(field)
sdw_master_attr(revision, "0x%x\n");
sdw_master_attr(clk_stop_modes, "0x%x\n");
sdw_master_attr(max_clk_freq, "%d\n");
sdw_master_attr(default_row, "%d\n");
sdw_master_attr(default_col, "%d\n");
sdw_master_attr(default_frame_rate, "%d\n");
sdw_master_attr(dynamic_frame, "%d\n");
sdw_master_attr(err_threshold, "%d\n");
static ssize_t clock_frequencies_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sdw_master_device *md = dev_to_sdw_master_device(dev);
ssize_t size = 0;
int i;
for (i = 0; i < md->bus->prop.num_clk_freq; i++)
size += sprintf(buf + size, "%8d ",
md->bus->prop.clk_freq[i]);
size += sprintf(buf + size, "\n");
return size;
}
static DEVICE_ATTR_RO(clock_frequencies);
static ssize_t clock_gears_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sdw_master_device *md = dev_to_sdw_master_device(dev);
ssize_t size = 0;
int i;
for (i = 0; i < md->bus->prop.num_clk_gears; i++)
size += sprintf(buf + size, "%8d ",
md->bus->prop.clk_gears[i]);
size += sprintf(buf + size, "\n");
return size;
}
static DEVICE_ATTR_RO(clock_gears);
static struct attribute *master_node_attrs[] = {
&dev_attr_revision.attr,
&dev_attr_clk_stop_modes.attr,
&dev_attr_max_clk_freq.attr,
&dev_attr_default_row.attr,
&dev_attr_default_col.attr,
&dev_attr_default_frame_rate.attr,
&dev_attr_dynamic_frame.attr,
&dev_attr_err_threshold.attr,
&dev_attr_clock_frequencies.attr,
&dev_attr_clock_gears.attr,
NULL,
};
ATTRIBUTE_GROUPS(master_node);
static void sdw_master_device_release(struct device *dev)
{
struct sdw_master_device *md = dev_to_sdw_master_device(dev);
@ -48,6 +131,7 @@ int sdw_master_device_add(struct sdw_bus *bus, struct device *parent,
md->dev.bus = &sdw_bus_type;
md->dev.type = &sdw_master_type;
md->dev.parent = parent;
md->dev.groups = master_node_groups;
md->dev.of_node = parent->of_node;
md->dev.fwnode = fwnode;
md->dev.dma_mask = parent->dma_mask;