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 * status and device_number come directly from the MIPI SoundWire 21 * 1.x specification. 22 * 23 * Base file is device 24 * |---- status 25 * |---- device_number 26 * |---- modalias 27 * |---- dev-properties 28 * |---- mipi_revision 29 * |---- wake_capable 30 * |---- test_mode_capable 31 * |---- clk_stop_mode1 32 * |---- simple_clk_stop_capable 33 * |---- clk_stop_timeout 34 * |---- ch_prep_timeout 35 * |---- reset_behave 36 * |---- high_PHY_capable 37 * |---- paging_support 38 * |---- bank_delay_support 39 * |---- p15_behave 40 * |---- master_count 41 * |---- source_ports 42 * |---- sink_ports 43 * |---- dp0 44 * |---- max_word 45 * |---- min_word 46 * |---- words 47 * |---- BRA_flow_controlled 48 * |---- simple_ch_prep_sm 49 * |---- imp_def_interrupts 50 * |---- dpN_<sink/src> 51 * |---- max_word 52 * |---- min_word 53 * |---- words 54 * |---- type 55 * |---- max_grouping 56 * |---- simple_ch_prep_sm 57 * |---- ch_prep_timeout 58 * |---- imp_def_interrupts 59 * |---- min_ch 60 * |---- max_ch 61 * |---- channels 62 * |---- ch_combinations 63 * |---- max_async_buffer 64 * |---- block_pack_mode 65 * |---- port_encoding 66 * 67 */ 68 69 #define sdw_slave_attr(field, format_string) \ 70 static ssize_t field##_show(struct device *dev, \ 71 struct device_attribute *attr, \ 72 char *buf) \ 73 { \ 74 struct sdw_slave *slave = dev_to_sdw_dev(dev); \ 75 return sprintf(buf, format_string, slave->prop.field); \ 76 } \ 77 static DEVICE_ATTR_RO(field) 78 79 sdw_slave_attr(mipi_revision, "0x%x\n"); 80 sdw_slave_attr(wake_capable, "%d\n"); 81 sdw_slave_attr(test_mode_capable, "%d\n"); 82 sdw_slave_attr(clk_stop_mode1, "%d\n"); 83 sdw_slave_attr(simple_clk_stop_capable, "%d\n"); 84 sdw_slave_attr(clk_stop_timeout, "%d\n"); 85 sdw_slave_attr(ch_prep_timeout, "%d\n"); 86 sdw_slave_attr(reset_behave, "%d\n"); 87 sdw_slave_attr(high_PHY_capable, "%d\n"); 88 sdw_slave_attr(paging_support, "%d\n"); 89 sdw_slave_attr(bank_delay_support, "%d\n"); 90 sdw_slave_attr(p15_behave, "%d\n"); 91 sdw_slave_attr(master_count, "%d\n"); 92 sdw_slave_attr(source_ports, "0x%x\n"); 93 sdw_slave_attr(sink_ports, "0x%x\n"); 94 95 static ssize_t modalias_show(struct device *dev, 96 struct device_attribute *attr, char *buf) 97 { 98 struct sdw_slave *slave = dev_to_sdw_dev(dev); 99 100 return sdw_slave_modalias(slave, buf, 256); 101 } 102 static DEVICE_ATTR_RO(modalias); 103 104 static struct attribute *slave_attrs[] = { 105 &dev_attr_modalias.attr, 106 NULL, 107 }; 108 109 static const struct attribute_group slave_attr_group = { 110 .attrs = slave_attrs, 111 }; 112 113 static struct attribute *slave_dev_attrs[] = { 114 &dev_attr_mipi_revision.attr, 115 &dev_attr_wake_capable.attr, 116 &dev_attr_test_mode_capable.attr, 117 &dev_attr_clk_stop_mode1.attr, 118 &dev_attr_simple_clk_stop_capable.attr, 119 &dev_attr_clk_stop_timeout.attr, 120 &dev_attr_ch_prep_timeout.attr, 121 &dev_attr_reset_behave.attr, 122 &dev_attr_high_PHY_capable.attr, 123 &dev_attr_paging_support.attr, 124 &dev_attr_bank_delay_support.attr, 125 &dev_attr_p15_behave.attr, 126 &dev_attr_master_count.attr, 127 &dev_attr_source_ports.attr, 128 &dev_attr_sink_ports.attr, 129 NULL, 130 }; 131 132 static const struct attribute_group sdw_slave_dev_attr_group = { 133 .attrs = slave_dev_attrs, 134 .name = "dev-properties", 135 }; 136 137 /* 138 * DP0 sysfs 139 */ 140 141 #define sdw_dp0_attr(field, format_string) \ 142 static ssize_t field##_show(struct device *dev, \ 143 struct device_attribute *attr, \ 144 char *buf) \ 145 { \ 146 struct sdw_slave *slave = dev_to_sdw_dev(dev); \ 147 return sprintf(buf, format_string, slave->prop.dp0_prop->field);\ 148 } \ 149 static DEVICE_ATTR_RO(field) 150 151 sdw_dp0_attr(max_word, "%d\n"); 152 sdw_dp0_attr(min_word, "%d\n"); 153 sdw_dp0_attr(BRA_flow_controlled, "%d\n"); 154 sdw_dp0_attr(simple_ch_prep_sm, "%d\n"); 155 sdw_dp0_attr(imp_def_interrupts, "0x%x\n"); 156 157 static ssize_t words_show(struct device *dev, 158 struct device_attribute *attr, char *buf) 159 { 160 struct sdw_slave *slave = dev_to_sdw_dev(dev); 161 ssize_t size = 0; 162 int i; 163 164 for (i = 0; i < slave->prop.dp0_prop->num_words; i++) 165 size += sprintf(buf + size, "%d ", 166 slave->prop.dp0_prop->words[i]); 167 size += sprintf(buf + size, "\n"); 168 169 return size; 170 } 171 static DEVICE_ATTR_RO(words); 172 173 static struct attribute *dp0_attrs[] = { 174 &dev_attr_max_word.attr, 175 &dev_attr_min_word.attr, 176 &dev_attr_words.attr, 177 &dev_attr_BRA_flow_controlled.attr, 178 &dev_attr_simple_ch_prep_sm.attr, 179 &dev_attr_imp_def_interrupts.attr, 180 NULL, 181 }; 182 183 static umode_t dp0_attr_visible(struct kobject *kobj, struct attribute *attr, 184 int n) 185 { 186 struct sdw_slave *slave = dev_to_sdw_dev(kobj_to_dev(kobj)); 187 188 if (slave->prop.dp0_prop) 189 return attr->mode; 190 return 0; 191 } 192 193 static bool dp0_group_visible(struct kobject *kobj) 194 { 195 struct sdw_slave *slave = dev_to_sdw_dev(kobj_to_dev(kobj)); 196 197 if (slave->prop.dp0_prop) 198 return true; 199 return false; 200 } 201 DEFINE_SYSFS_GROUP_VISIBLE(dp0); 202 203 static const struct attribute_group dp0_group = { 204 .attrs = dp0_attrs, 205 .is_visible = SYSFS_GROUP_VISIBLE(dp0), 206 .name = "dp0", 207 }; 208 209 const struct attribute_group *sdw_attr_groups[] = { 210 &slave_attr_group, 211 &sdw_slave_dev_attr_group, 212 &dp0_group, 213 NULL, 214 }; 215 216 /* 217 * the status is shown in capital letters for UNATTACHED and RESERVED 218 * on purpose, to highligh users to the fact that these status values 219 * are not expected. 220 */ 221 static const char *const slave_status[] = { 222 [SDW_SLAVE_UNATTACHED] = "UNATTACHED", 223 [SDW_SLAVE_ATTACHED] = "Attached", 224 [SDW_SLAVE_ALERT] = "Alert", 225 [SDW_SLAVE_RESERVED] = "RESERVED", 226 }; 227 228 static ssize_t status_show(struct device *dev, 229 struct device_attribute *attr, char *buf) 230 { 231 struct sdw_slave *slave = dev_to_sdw_dev(dev); 232 233 return sprintf(buf, "%s\n", slave_status[slave->status]); 234 } 235 static DEVICE_ATTR_RO(status); 236 237 static ssize_t device_number_show(struct device *dev, 238 struct device_attribute *attr, char *buf) 239 { 240 struct sdw_slave *slave = dev_to_sdw_dev(dev); 241 242 if (slave->status == SDW_SLAVE_UNATTACHED) 243 return sprintf(buf, "%s", "N/A"); 244 else 245 return sprintf(buf, "%d", slave->dev_num); 246 } 247 static DEVICE_ATTR_RO(device_number); 248 249 static struct attribute *slave_status_attrs[] = { 250 &dev_attr_status.attr, 251 &dev_attr_device_number.attr, 252 NULL, 253 }; 254 255 /* 256 * we don't use ATTRIBUTES_GROUP here since the group is used in a 257 * separate file and can't be handled as a static. 258 */ 259 static const struct attribute_group sdw_slave_status_attr_group = { 260 .attrs = slave_status_attrs, 261 }; 262 263 const struct attribute_group *sdw_slave_status_attr_groups[] = { 264 &sdw_slave_status_attr_group, 265 NULL 266 }; 267