Quelle  sysfs_slave.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
// Copyright(c) 2015-2020 Intel Corporation.

#include <linux/device.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/soundwire/sdw.h>
#include <linux/soundwire/sdw_type.h>
#include "bus.h"
#include "sysfs_local.h"

/*
 * Slave sysfs
 */

/*
 * The sysfs for Slave reflects the MIPI description as given
 * in the MIPI DisCo spec.
 * status and device_number come directly from the MIPI SoundWire
 * 1.x specification.
 *
 * Base file is device
 * |---- status
 * |---- device_number
 * |---- modalias
 * |---- dev-properties
 * |---- mipi_revision
 * |---- wake_capable
 * |---- test_mode_capable
 * |---- clk_stop_mode1
 * |---- simple_clk_stop_capable
 * |---- clk_stop_timeout
 * |---- ch_prep_timeout
 * |---- reset_behave
 * |---- high_PHY_capable
 * |---- paging_support
 * |---- bank_delay_support
 * |---- p15_behave
 * |---- master_count
 * |---- source_ports
 * |---- sink_ports
 * |---- dp0
 * |---- max_word
 * |---- min_word
 * |---- words
 * |---- BRA_flow_controlled
 * |---- simple_ch_prep_sm
 * |---- imp_def_interrupts
 * |---- dpN_<sink/src>
 * |---- max_word
 * |---- min_word
 * |---- words
 * |---- type
 * |---- max_grouping
 * |---- simple_ch_prep_sm
 * |---- ch_prep_timeout
 * |---- imp_def_interrupts
 * |---- min_ch
 * |---- max_ch
 * |---- channels
 * |---- ch_combinations
 * |---- max_async_buffer
 * |---- block_pack_mode
 * |---- port_encoding
 *
 */

#define sdw_slave_attr(field, format_string)   \
static ssize_t field##_show(struct device *dev,   \
       struct device_attribute *attr, \
       char *buf)    \
{        \
 struct sdw_slave *slave = dev_to_sdw_dev(dev);  \
 return sprintf(buf, format_string, slave->prop.field); \
}        \
static DEVICE_ATTR_RO(field)

sdw_slave_attr(mipi_revision, "0x%x\n");
sdw_slave_attr(wake_capable, "%d\n");
sdw_slave_attr(test_mode_capable, "%d\n");
sdw_slave_attr(clk_stop_mode1, "%d\n");
sdw_slave_attr(simple_clk_stop_capable, "%d\n");
sdw_slave_attr(clk_stop_timeout, "%d\n");
sdw_slave_attr(ch_prep_timeout, "%d\n");
sdw_slave_attr(reset_behave, "%d\n");
sdw_slave_attr(high_PHY_capable, "%d\n");
sdw_slave_attr(paging_support, "%d\n");
sdw_slave_attr(bank_delay_support, "%d\n");
sdw_slave_attr(p15_behave, "%d\n");
sdw_slave_attr(master_count, "%d\n");
sdw_slave_attr(source_ports, "0x%x\n");
sdw_slave_attr(sink_ports, "0x%x\n");

static ssize_t modalias_show(struct device *dev,
        struct device_attribute *attr, char *buf)
{
 struct sdw_slave *slave = dev_to_sdw_dev(dev);

 return sdw_slave_modalias(slave, buf, 256);
}
static DEVICE_ATTR_RO(modalias);

static struct attribute *slave_attrs[] = {
 &dev_attr_modalias.attr,
 NULL,
};

static const struct attribute_group slave_attr_group = {
 .attrs = slave_attrs,
};

static struct attribute *slave_dev_attrs[] = {
 &dev_attr_mipi_revision.attr,
 &dev_attr_wake_capable.attr,
 &dev_attr_test_mode_capable.attr,
 &dev_attr_clk_stop_mode1.attr,
 &dev_attr_simple_clk_stop_capable.attr,
 &dev_attr_clk_stop_timeout.attr,
 &dev_attr_ch_prep_timeout.attr,
 &dev_attr_reset_behave.attr,
 &dev_attr_high_PHY_capable.attr,
 &dev_attr_paging_support.attr,
 &dev_attr_bank_delay_support.attr,
 &dev_attr_p15_behave.attr,
 &dev_attr_master_count.attr,
 &dev_attr_source_ports.attr,
 &dev_attr_sink_ports.attr,
 NULL,
};

static const struct attribute_group sdw_slave_dev_attr_group = {
 .attrs = slave_dev_attrs,
 .name = "dev-properties",
};

/*
 * DP0 sysfs
 */

#define sdw_dp0_attr(field, format_string)    \
static ssize_t field##_show(struct device *dev,    \
       struct device_attribute *attr,  \
       char *buf)     \
{         \
 struct sdw_slave *slave = dev_to_sdw_dev(dev);   \
 return sprintf(buf, format_string, slave->prop.dp0_prop->field);\
}         \
static DEVICE_ATTR_RO(field)

sdw_dp0_attr(max_word, "%d\n");
sdw_dp0_attr(min_word, "%d\n");
sdw_dp0_attr(BRA_flow_controlled, "%d\n");
sdw_dp0_attr(simple_ch_prep_sm, "%d\n");
sdw_dp0_attr(imp_def_interrupts, "0x%x\n");

static ssize_t words_show(struct device *dev,
     struct device_attribute *attr, char *buf)
{
 struct sdw_slave *slave = dev_to_sdw_dev(dev);
 ssize_t size = 0;
 int i;

 for (i = 0; i < slave->prop.dp0_prop->num_words; i++)
  size += sprintf(buf + size, "%d ",
    slave->prop.dp0_prop->words[i]);
 size += sprintf(buf + size, "\n");

 return size;
}
static DEVICE_ATTR_RO(words);

static struct attribute *dp0_attrs[] = {
 &dev_attr_max_word.attr,
 &dev_attr_min_word.attr,
 &dev_attr_words.attr,
 &dev_attr_BRA_flow_controlled.attr,
 &dev_attr_simple_ch_prep_sm.attr,
 &dev_attr_imp_def_interrupts.attr,
 NULL,
};

static umode_t dp0_attr_visible(struct kobject *kobj, struct attribute *attr,
         int n)
{
 struct sdw_slave *slave = dev_to_sdw_dev(kobj_to_dev(kobj));

 if (slave->prop.dp0_prop)
  return attr->mode;
 return 0;
}

static bool dp0_group_visible(struct kobject *kobj)
{
 struct sdw_slave *slave = dev_to_sdw_dev(kobj_to_dev(kobj));

 if (slave->prop.dp0_prop)
  return true;
 return false;
}
DEFINE_SYSFS_GROUP_VISIBLE(dp0);

static const struct attribute_group dp0_group = {
 .attrs = dp0_attrs,
 .is_visible = SYSFS_GROUP_VISIBLE(dp0),
 .name = "dp0",
};

const struct attribute_group *sdw_attr_groups[] = {
 &slave_attr_group,
 &sdw_slave_dev_attr_group,
 &dp0_group,
 NULL,
};

/*
 * the status is shown in capital letters for UNATTACHED and RESERVED
 * on purpose, to highlight users to the fact that these status values
 * are not expected.
 */
static const char *const slave_status[] = {
 [SDW_SLAVE_UNATTACHED] =  "UNATTACHED",
 [SDW_SLAVE_ATTACHED] = "Attached",
 [SDW_SLAVE_ALERT] = "Alert",
 [SDW_SLAVE_RESERVED] = "RESERVED",
};

static ssize_t status_show(struct device *dev,
      struct device_attribute *attr, char *buf)
{
 struct sdw_slave *slave = dev_to_sdw_dev(dev);

 return sprintf(buf, "%s\n", slave_status[slave->status]);
}
static DEVICE_ATTR_RO(status);

static ssize_t device_number_show(struct device *dev,
      struct device_attribute *attr, char *buf)
{
 struct sdw_slave *slave = dev_to_sdw_dev(dev);

 if (slave->status == SDW_SLAVE_UNATTACHED)
  return sprintf(buf, "%s", "N/A");
 else
  return sprintf(buf, "%d", slave->dev_num);
}
static DEVICE_ATTR_RO(device_number);

static struct attribute *slave_status_attrs[] = {
 &dev_attr_status.attr,
 &dev_attr_device_number.attr,
 NULL,
};

/*
 * we don't use ATTRIBUTES_GROUP here since the group is used in a
 * separate file and can't be handled as a static.
 */
static const struct attribute_group sdw_slave_status_attr_group = {
 .attrs = slave_status_attrs,
};

const struct attribute_group *sdw_slave_status_attr_groups[] = {
 &sdw_slave_status_attr_group,
 NULL
};