271 lines
6.7 KiB
C
271 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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// Copyright(c) 2015-2020 Intel Corporation.
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#include <linux/device.h>
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#include <linux/mod_devicetable.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/soundwire/sdw.h>
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#include <linux/soundwire/sdw_type.h>
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#include "bus.h"
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#include "sysfs_local.h"
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/*
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* Slave sysfs
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*/
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/*
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* The sysfs for Slave reflects the MIPI description as given
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* in the MIPI DisCo spec.
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* status and device_number come directly from the MIPI SoundWire
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* 1.x specification.
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*
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* Base file is device
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* |---- status
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* |---- device_number
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* |---- modalias
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* |---- dev-properties
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* |---- mipi_revision
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* |---- wake_capable
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* |---- test_mode_capable
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* |---- clk_stop_mode1
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* |---- simple_clk_stop_capable
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* |---- clk_stop_timeout
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* |---- ch_prep_timeout
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* |---- reset_behave
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* |---- high_PHY_capable
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* |---- paging_support
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* |---- bank_delay_support
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* |---- p15_behave
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* |---- master_count
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* |---- source_ports
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* |---- sink_ports
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* |---- dp0
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* |---- max_word
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* |---- min_word
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* |---- words
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* |---- BRA_flow_controlled
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* |---- simple_ch_prep_sm
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* |---- imp_def_interrupts
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* |---- dpN_<sink/src>
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* |---- max_word
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* |---- min_word
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* |---- words
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* |---- type
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* |---- max_grouping
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* |---- simple_ch_prep_sm
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* |---- ch_prep_timeout
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* |---- imp_def_interrupts
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* |---- min_ch
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* |---- max_ch
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* |---- channels
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* |---- ch_combinations
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* |---- max_async_buffer
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* |---- block_pack_mode
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* |---- port_encoding
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*
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*/
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#define sdw_slave_attr(field, format_string) \
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static ssize_t field##_show(struct device *dev, \
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struct device_attribute *attr, \
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char *buf) \
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{ \
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struct sdw_slave *slave = dev_to_sdw_dev(dev); \
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return sprintf(buf, format_string, slave->prop.field); \
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} \
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static DEVICE_ATTR_RO(field)
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sdw_slave_attr(mipi_revision, "0x%x\n");
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sdw_slave_attr(wake_capable, "%d\n");
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sdw_slave_attr(test_mode_capable, "%d\n");
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sdw_slave_attr(clk_stop_mode1, "%d\n");
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sdw_slave_attr(simple_clk_stop_capable, "%d\n");
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sdw_slave_attr(clk_stop_timeout, "%d\n");
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sdw_slave_attr(ch_prep_timeout, "%d\n");
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sdw_slave_attr(reset_behave, "%d\n");
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sdw_slave_attr(high_PHY_capable, "%d\n");
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sdw_slave_attr(paging_support, "%d\n");
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sdw_slave_attr(bank_delay_support, "%d\n");
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sdw_slave_attr(p15_behave, "%d\n");
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sdw_slave_attr(master_count, "%d\n");
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sdw_slave_attr(source_ports, "0x%x\n");
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sdw_slave_attr(sink_ports, "0x%x\n");
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static ssize_t modalias_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct sdw_slave *slave = dev_to_sdw_dev(dev);
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return sdw_slave_modalias(slave, buf, 256);
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}
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static DEVICE_ATTR_RO(modalias);
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static struct attribute *slave_attrs[] = {
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&dev_attr_modalias.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(slave);
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static struct attribute *slave_dev_attrs[] = {
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&dev_attr_mipi_revision.attr,
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&dev_attr_wake_capable.attr,
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&dev_attr_test_mode_capable.attr,
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&dev_attr_clk_stop_mode1.attr,
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&dev_attr_simple_clk_stop_capable.attr,
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&dev_attr_clk_stop_timeout.attr,
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&dev_attr_ch_prep_timeout.attr,
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&dev_attr_reset_behave.attr,
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&dev_attr_high_PHY_capable.attr,
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&dev_attr_paging_support.attr,
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&dev_attr_bank_delay_support.attr,
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&dev_attr_p15_behave.attr,
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&dev_attr_master_count.attr,
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&dev_attr_source_ports.attr,
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&dev_attr_sink_ports.attr,
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NULL,
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};
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/*
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* we don't use ATTRIBUTES_GROUP here since we want to add a subdirectory
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* for device-level properties
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*/
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static const struct attribute_group sdw_slave_dev_attr_group = {
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.attrs = slave_dev_attrs,
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.name = "dev-properties",
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};
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/*
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* DP0 sysfs
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*/
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#define sdw_dp0_attr(field, format_string) \
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static ssize_t field##_show(struct device *dev, \
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struct device_attribute *attr, \
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char *buf) \
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{ \
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struct sdw_slave *slave = dev_to_sdw_dev(dev); \
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return sprintf(buf, format_string, slave->prop.dp0_prop->field);\
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} \
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static DEVICE_ATTR_RO(field)
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sdw_dp0_attr(max_word, "%d\n");
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sdw_dp0_attr(min_word, "%d\n");
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sdw_dp0_attr(BRA_flow_controlled, "%d\n");
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sdw_dp0_attr(simple_ch_prep_sm, "%d\n");
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sdw_dp0_attr(imp_def_interrupts, "0x%x\n");
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static ssize_t words_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct sdw_slave *slave = dev_to_sdw_dev(dev);
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ssize_t size = 0;
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int i;
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for (i = 0; i < slave->prop.dp0_prop->num_words; i++)
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size += sprintf(buf + size, "%d ",
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slave->prop.dp0_prop->words[i]);
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size += sprintf(buf + size, "\n");
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return size;
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}
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static DEVICE_ATTR_RO(words);
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static struct attribute *dp0_attrs[] = {
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&dev_attr_max_word.attr,
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&dev_attr_min_word.attr,
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&dev_attr_words.attr,
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&dev_attr_BRA_flow_controlled.attr,
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&dev_attr_simple_ch_prep_sm.attr,
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&dev_attr_imp_def_interrupts.attr,
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NULL,
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};
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/*
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* we don't use ATTRIBUTES_GROUP here since we want to add a subdirectory
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* for dp0-level properties
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*/
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static const struct attribute_group dp0_group = {
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.attrs = dp0_attrs,
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.name = "dp0",
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};
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int sdw_slave_sysfs_init(struct sdw_slave *slave)
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{
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int ret;
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ret = devm_device_add_groups(&slave->dev, slave_groups);
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if (ret < 0)
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return ret;
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ret = devm_device_add_group(&slave->dev, &sdw_slave_dev_attr_group);
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if (ret < 0)
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return ret;
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if (slave->prop.dp0_prop) {
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ret = devm_device_add_group(&slave->dev, &dp0_group);
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if (ret < 0)
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return ret;
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}
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if (slave->prop.source_ports || slave->prop.sink_ports) {
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ret = sdw_slave_sysfs_dpn_init(slave);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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/*
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* the status is shown in capital letters for UNATTACHED and RESERVED
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* on purpose, to highligh users to the fact that these status values
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* are not expected.
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*/
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static const char *const slave_status[] = {
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[SDW_SLAVE_UNATTACHED] = "UNATTACHED",
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[SDW_SLAVE_ATTACHED] = "Attached",
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[SDW_SLAVE_ALERT] = "Alert",
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[SDW_SLAVE_RESERVED] = "RESERVED",
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};
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static ssize_t status_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct sdw_slave *slave = dev_to_sdw_dev(dev);
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return sprintf(buf, "%s\n", slave_status[slave->status]);
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}
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static DEVICE_ATTR_RO(status);
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static ssize_t device_number_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct sdw_slave *slave = dev_to_sdw_dev(dev);
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if (slave->status == SDW_SLAVE_UNATTACHED)
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return sprintf(buf, "%s", "N/A");
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else
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return sprintf(buf, "%d", slave->dev_num);
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}
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static DEVICE_ATTR_RO(device_number);
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static struct attribute *slave_status_attrs[] = {
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&dev_attr_status.attr,
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&dev_attr_device_number.attr,
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NULL,
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};
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/*
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* we don't use ATTRIBUTES_GROUP here since the group is used in a
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* separate file and can't be handled as a static.
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*/
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static const struct attribute_group sdw_slave_status_attr_group = {
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.attrs = slave_status_attrs,
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};
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const struct attribute_group *sdw_slave_status_attr_groups[] = {
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&sdw_slave_status_attr_group,
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NULL
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};
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