drivers/soundwire/sysfs_slave.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 // Copyright(c) 2015-2020 Intel Corporation.
   3
   4 #include <linux/device.h>
   5 #include <linux/mod_devicetable.h>
   6 #include <linux/slab.h>
   7 #include <linux/sysfs.h>
   8 #include <linux/soundwire/sdw.h>
   9 #include <linux/soundwire/sdw_type.h>
  10 #include "bus.h"
  11 #include "sysfs_local.h"
  12
  13 /*
  14  * Slave sysfs
  15  */
  16
  17 /*
  18  * The sysfs for Slave reflects the MIPI description as given
  19  * in the MIPI DisCo spec
  20  *
  21  * Base file is device
  22  *      |---- modalias
  23  *      |---- dev-properties
  24  *              |---- mipi_revision
  25  *              |---- wake_capable
  26  *              |---- test_mode_capable
  27  *              |---- clk_stop_mode1
  28  *              |---- simple_clk_stop_capable
  29  *              |---- clk_stop_timeout
  30  *              |---- ch_prep_timeout
  31  *              |---- reset_behave
  32  *              |---- high_PHY_capable
  33  *              |---- paging_support
  34  *              |---- bank_delay_support
  35  *              |---- p15_behave
  36  *              |---- master_count
  37  *              |---- source_ports
  38  *              |---- sink_ports
  39  *      |---- dp0
  40  *              |---- max_word
  41  *              |---- min_word
  42  *              |---- words
  43  *              |---- BRA_flow_controlled
  44  *              |---- simple_ch_prep_sm
  45  *              |---- imp_def_interrupts
  46  *      |---- dpN_<sink/src>
  47  *              |---- max_word
  48  *              |---- min_word
  49  *              |---- words
  50  *              |---- type
  51  *              |---- max_grouping
  52  *              |---- simple_ch_prep_sm
  53  *              |---- ch_prep_timeout
  54  *              |---- imp_def_interrupts
  55  *              |---- min_ch
  56  *              |---- max_ch
  57  *              |---- channels
  58  *              |---- ch_combinations
  59  *              |---- max_async_buffer
  60  *              |---- block_pack_mode
  61  *              |---- port_encoding
  62  *
  63  */
  64
  65 #define sdw_slave_attr(field, format_string)                    \
  66 static ssize_t field##_show(struct device *dev,                 \
  67                             struct device_attribute *attr,      \
  68                             char *buf)                          \
  69 {                                                               \
  70         struct sdw_slave *slave = dev_to_sdw_dev(dev);          \
  71         return sprintf(buf, format_string, slave->prop.field);  \
  72 }                                                               \
  73 static DEVICE_ATTR_RO(field)
  74
  75 sdw_slave_attr(mipi_revision, "0x%x\n");
  76 sdw_slave_attr(wake_capable, "%d\n");
  77 sdw_slave_attr(test_mode_capable, "%d\n");
  78 sdw_slave_attr(clk_stop_mode1, "%d\n");
  79 sdw_slave_attr(simple_clk_stop_capable, "%d\n");
  80 sdw_slave_attr(clk_stop_timeout, "%d\n");
  81 sdw_slave_attr(ch_prep_timeout, "%d\n");
  82 sdw_slave_attr(reset_behave, "%d\n");
  83 sdw_slave_attr(high_PHY_capable, "%d\n");
  84 sdw_slave_attr(paging_support, "%d\n");
  85 sdw_slave_attr(bank_delay_support, "%d\n");
  86 sdw_slave_attr(p15_behave, "%d\n");
  87 sdw_slave_attr(master_count, "%d\n");
  88 sdw_slave_attr(source_ports, "0x%x\n");
  89 sdw_slave_attr(sink_ports, "0x%x\n");
  90
  91 static ssize_t modalias_show(struct device *dev,
  92                              struct device_attribute *attr, char *buf)
  93 {
  94         struct sdw_slave *slave = dev_to_sdw_dev(dev);
  95
  96         return sdw_slave_modalias(slave, buf, 256);
  97 }
  98 static DEVICE_ATTR_RO(modalias);
  99
 100 static struct attribute *slave_attrs[] = {
 101         &dev_attr_modalias.attr,
 102         NULL,
 103 };
 104 ATTRIBUTE_GROUPS(slave);
 105
 106 static struct attribute *slave_dev_attrs[] = {
 107         &dev_attr_mipi_revision.attr,
 108         &dev_attr_wake_capable.attr,
 109         &dev_attr_test_mode_capable.attr,
 110         &dev_attr_clk_stop_mode1.attr,
 111         &dev_attr_simple_clk_stop_capable.attr,
 112         &dev_attr_clk_stop_timeout.attr,
 113         &dev_attr_ch_prep_timeout.attr,
 114         &dev_attr_reset_behave.attr,
 115         &dev_attr_high_PHY_capable.attr,
 116         &dev_attr_paging_support.attr,
 117         &dev_attr_bank_delay_support.attr,
 118         &dev_attr_p15_behave.attr,
 119         &dev_attr_master_count.attr,
 120         &dev_attr_source_ports.attr,
 121         &dev_attr_sink_ports.attr,
 122         NULL,
 123 };
 124
 125 /*
 126  * we don't use ATTRIBUTES_GROUP here since we want to add a subdirectory
 127  * for device-level properties
 128  */
 129 static struct attribute_group sdw_slave_dev_attr_group = {
 130         .attrs  = slave_dev_attrs,
 131         .name = "dev-properties",
 132 };
 133
 134 /*
 135  * DP0 sysfs
 136  */
 137
 138 #define sdw_dp0_attr(field, format_string)                              \
 139 static ssize_t field##_show(struct device *dev,                         \
 140                             struct device_attribute *attr,              \
 141                             char *buf)                                  \
 142 {                                                                       \
 143         struct sdw_slave *slave = dev_to_sdw_dev(dev);                  \
 144         return sprintf(buf, format_string, slave->prop.dp0_prop->field);\
 145 }                                                                       \
 146 static DEVICE_ATTR_RO(field)
 147
 148 sdw_dp0_attr(max_word, "%d\n");
 149 sdw_dp0_attr(min_word, "%d\n");
 150 sdw_dp0_attr(BRA_flow_controlled, "%d\n");
 151 sdw_dp0_attr(simple_ch_prep_sm, "%d\n");
 152 sdw_dp0_attr(imp_def_interrupts, "0x%x\n");
 153
 154 static ssize_t words_show(struct device *dev,
 155                           struct device_attribute *attr, char *buf)
 156 {
 157         struct sdw_slave *slave = dev_to_sdw_dev(dev);
 158         ssize_t size = 0;
 159         int i;
 160
 161         for (i = 0; i < slave->prop.dp0_prop->num_words; i++)
 162                 size += sprintf(buf + size, "%d ",
 163                                 slave->prop.dp0_prop->words[i]);
 164         size += sprintf(buf + size, "\n");
 165
 166         return size;
 167 }
 168 static DEVICE_ATTR_RO(words);
 169
 170 static struct attribute *dp0_attrs[] = {
 171         &dev_attr_max_word.attr,
 172         &dev_attr_min_word.attr,
 173         &dev_attr_words.attr,
 174         &dev_attr_BRA_flow_controlled.attr,
 175         &dev_attr_simple_ch_prep_sm.attr,
 176         &dev_attr_imp_def_interrupts.attr,
 177         NULL,
 178 };
 179
 180 /*
 181  * we don't use ATTRIBUTES_GROUP here since we want to add a subdirectory
 182  * for dp0-level properties
 183  */
 184 static const struct attribute_group dp0_group = {
 185         .attrs = dp0_attrs,
 186         .name = "dp0",
 187 };
 188
 189 int sdw_slave_sysfs_init(struct sdw_slave *slave)
 190 {
 191         int ret;
 192
 193         ret = devm_device_add_groups(&slave->dev, slave_groups);
 194         if (ret < 0)
 195                 return ret;
 196
 197         ret = devm_device_add_group(&slave->dev, &sdw_slave_dev_attr_group);
 198         if (ret < 0)
 199                 return ret;
 200
 201         if (slave->prop.dp0_prop) {
 202                 ret = devm_device_add_group(&slave->dev, &dp0_group);
 203                 if (ret < 0)
 204                         return ret;
 205         }
 206
 207         if (slave->prop.source_ports || slave->prop.sink_ports) {
 208                 ret = sdw_slave_sysfs_dpn_init(slave);
 209                 if (ret < 0)
 210                         return ret;
 211         }
 212
 213         return 0;
 214 }