soundwire: master: add sysfs support (c5778ca4) · Commits · 戴 / test

Documentation/ABI/testing/sysfs-bus-soundwire-master

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+23 −0

Original line number	Diff line number	Diff line
		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.

drivers/soundwire/master.c

+84 −0

Original line number	Diff line number	Diff line
		@@ -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;

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