mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
c5778ca49a
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>
173 lines
4.2 KiB
C
173 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
// Copyright(c) 2019-2020 Intel Corporation.
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/acpi.h>
|
|
#include <linux/pm_runtime.h>
|
|
#include <linux/soundwire/sdw.h>
|
|
#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);
|
|
|
|
kfree(md);
|
|
}
|
|
|
|
static const struct dev_pm_ops master_dev_pm = {
|
|
SET_RUNTIME_PM_OPS(pm_generic_runtime_suspend,
|
|
pm_generic_runtime_resume, NULL)
|
|
};
|
|
|
|
struct device_type sdw_master_type = {
|
|
.name = "soundwire_master",
|
|
.release = sdw_master_device_release,
|
|
.pm = &master_dev_pm,
|
|
};
|
|
|
|
/**
|
|
* sdw_master_device_add() - create a Linux Master Device representation.
|
|
* @bus: SDW bus instance
|
|
* @parent: parent device
|
|
* @fwnode: firmware node handle
|
|
*/
|
|
int sdw_master_device_add(struct sdw_bus *bus, struct device *parent,
|
|
struct fwnode_handle *fwnode)
|
|
{
|
|
struct sdw_master_device *md;
|
|
int ret;
|
|
|
|
if (!parent)
|
|
return -EINVAL;
|
|
|
|
md = kzalloc(sizeof(*md), GFP_KERNEL);
|
|
if (!md)
|
|
return -ENOMEM;
|
|
|
|
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;
|
|
|
|
dev_set_name(&md->dev, "sdw-master-%d", bus->id);
|
|
|
|
ret = device_register(&md->dev);
|
|
if (ret) {
|
|
dev_err(parent, "Failed to add master: ret %d\n", ret);
|
|
/*
|
|
* On err, don't free but drop ref as this will be freed
|
|
* when release method is invoked.
|
|
*/
|
|
put_device(&md->dev);
|
|
goto device_register_err;
|
|
}
|
|
|
|
/* add shortcuts to improve code readability/compactness */
|
|
md->bus = bus;
|
|
bus->dev = &md->dev;
|
|
bus->md = md;
|
|
|
|
device_register_err:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* sdw_master_device_del() - delete a Linux Master Device representation.
|
|
* @bus: bus handle
|
|
*
|
|
* This function is the dual of sdw_master_device_add()
|
|
*/
|
|
int sdw_master_device_del(struct sdw_bus *bus)
|
|
{
|
|
device_unregister(bus->dev);
|
|
|
|
return 0;
|
|
}
|