diff options
Diffstat (limited to 'drivers/soundwire/sysfs_slave.c')
| -rw-r--r-- | drivers/soundwire/sysfs_slave.c | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/drivers/soundwire/sysfs_slave.c b/drivers/soundwire/sysfs_slave.c new file mode 100644 index 000000000..b48b6617a --- /dev/null +++ b/drivers/soundwire/sysfs_slave.c @@ -0,0 +1,270 @@ +// 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, +}; +ATTRIBUTE_GROUPS(slave); + +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, +}; + +/* + * we don't use ATTRIBUTES_GROUP here since we want to add a subdirectory + * for device-level properties + */ +static 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, +}; + +/* + * we don't use ATTRIBUTES_GROUP here since we want to add a subdirectory + * for dp0-level properties + */ +static const struct attribute_group dp0_group = { + .attrs = dp0_attrs, + .name = "dp0", +}; + +int sdw_slave_sysfs_init(struct sdw_slave *slave) +{ + int ret; + + ret = devm_device_add_groups(&slave->dev, slave_groups); + if (ret < 0) + return ret; + + ret = devm_device_add_group(&slave->dev, &sdw_slave_dev_attr_group); + if (ret < 0) + return ret; + + if (slave->prop.dp0_prop) { + ret = devm_device_add_group(&slave->dev, &dp0_group); + if (ret < 0) + return ret; + } + + if (slave->prop.source_ports || slave->prop.sink_ports) { + ret = sdw_slave_sysfs_dpn_init(slave); + if (ret < 0) + return ret; + } + + return 0; +} + +/* + * the status is shown in capital letters for UNATTACHED and RESERVED + * on purpose, to highligh 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 +}; |