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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 | |
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19 | * in the MIPI DisCo spec. |
20 | * status and device_number come directly from the MIPI SoundWire | |
21 | * 1.x specification. | |
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22 | * |
23 | * Base file is device | |
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24 | * |---- status |
25 | * |---- device_number | |
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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 | ATTRIBUTE_GROUPS(slave); | |
109 | ||
110 | static struct attribute *slave_dev_attrs[] = { | |
111 | &dev_attr_mipi_revision.attr, | |
112 | &dev_attr_wake_capable.attr, | |
113 | &dev_attr_test_mode_capable.attr, | |
114 | &dev_attr_clk_stop_mode1.attr, | |
115 | &dev_attr_simple_clk_stop_capable.attr, | |
116 | &dev_attr_clk_stop_timeout.attr, | |
117 | &dev_attr_ch_prep_timeout.attr, | |
118 | &dev_attr_reset_behave.attr, | |
119 | &dev_attr_high_PHY_capable.attr, | |
120 | &dev_attr_paging_support.attr, | |
121 | &dev_attr_bank_delay_support.attr, | |
122 | &dev_attr_p15_behave.attr, | |
123 | &dev_attr_master_count.attr, | |
124 | &dev_attr_source_ports.attr, | |
125 | &dev_attr_sink_ports.attr, | |
126 | NULL, | |
127 | }; | |
128 | ||
129 | /* | |
130 | * we don't use ATTRIBUTES_GROUP here since we want to add a subdirectory | |
131 | * for device-level properties | |
132 | */ | |
565e3afa | 133 | static const struct attribute_group sdw_slave_dev_attr_group = { |
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134 | .attrs = slave_dev_attrs, |
135 | .name = "dev-properties", | |
136 | }; | |
137 | ||
138 | /* | |
139 | * DP0 sysfs | |
140 | */ | |
141 | ||
142 | #define sdw_dp0_attr(field, format_string) \ | |
143 | static ssize_t field##_show(struct device *dev, \ | |
144 | struct device_attribute *attr, \ | |
145 | char *buf) \ | |
146 | { \ | |
147 | struct sdw_slave *slave = dev_to_sdw_dev(dev); \ | |
148 | return sprintf(buf, format_string, slave->prop.dp0_prop->field);\ | |
149 | } \ | |
150 | static DEVICE_ATTR_RO(field) | |
151 | ||
152 | sdw_dp0_attr(max_word, "%d\n"); | |
153 | sdw_dp0_attr(min_word, "%d\n"); | |
154 | sdw_dp0_attr(BRA_flow_controlled, "%d\n"); | |
155 | sdw_dp0_attr(simple_ch_prep_sm, "%d\n"); | |
156 | sdw_dp0_attr(imp_def_interrupts, "0x%x\n"); | |
157 | ||
158 | static ssize_t words_show(struct device *dev, | |
159 | struct device_attribute *attr, char *buf) | |
160 | { | |
161 | struct sdw_slave *slave = dev_to_sdw_dev(dev); | |
162 | ssize_t size = 0; | |
163 | int i; | |
164 | ||
165 | for (i = 0; i < slave->prop.dp0_prop->num_words; i++) | |
166 | size += sprintf(buf + size, "%d ", | |
167 | slave->prop.dp0_prop->words[i]); | |
168 | size += sprintf(buf + size, "\n"); | |
169 | ||
170 | return size; | |
171 | } | |
172 | static DEVICE_ATTR_RO(words); | |
173 | ||
174 | static struct attribute *dp0_attrs[] = { | |
175 | &dev_attr_max_word.attr, | |
176 | &dev_attr_min_word.attr, | |
177 | &dev_attr_words.attr, | |
178 | &dev_attr_BRA_flow_controlled.attr, | |
179 | &dev_attr_simple_ch_prep_sm.attr, | |
180 | &dev_attr_imp_def_interrupts.attr, | |
181 | NULL, | |
182 | }; | |
183 | ||
184 | /* | |
185 | * we don't use ATTRIBUTES_GROUP here since we want to add a subdirectory | |
186 | * for dp0-level properties | |
187 | */ | |
188 | static const struct attribute_group dp0_group = { | |
189 | .attrs = dp0_attrs, | |
190 | .name = "dp0", | |
191 | }; | |
192 | ||
193 | int sdw_slave_sysfs_init(struct sdw_slave *slave) | |
194 | { | |
195 | int ret; | |
196 | ||
197 | ret = devm_device_add_groups(&slave->dev, slave_groups); | |
198 | if (ret < 0) | |
199 | return ret; | |
200 | ||
201 | ret = devm_device_add_group(&slave->dev, &sdw_slave_dev_attr_group); | |
202 | if (ret < 0) | |
203 | return ret; | |
204 | ||
205 | if (slave->prop.dp0_prop) { | |
206 | ret = devm_device_add_group(&slave->dev, &dp0_group); | |
207 | if (ret < 0) | |
208 | return ret; | |
209 | } | |
210 | ||
211 | if (slave->prop.source_ports || slave->prop.sink_ports) { | |
212 | ret = sdw_slave_sysfs_dpn_init(slave); | |
213 | if (ret < 0) | |
214 | return ret; | |
215 | } | |
216 | ||
217 | return 0; | |
218 | } | |
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219 | |
220 | /* | |
221 | * the status is shown in capital letters for UNATTACHED and RESERVED | |
222 | * on purpose, to highligh users to the fact that these status values | |
223 | * are not expected. | |
224 | */ | |
225 | static const char *const slave_status[] = { | |
226 | [SDW_SLAVE_UNATTACHED] = "UNATTACHED", | |
227 | [SDW_SLAVE_ATTACHED] = "Attached", | |
228 | [SDW_SLAVE_ALERT] = "Alert", | |
229 | [SDW_SLAVE_RESERVED] = "RESERVED", | |
230 | }; | |
231 | ||
232 | static ssize_t status_show(struct device *dev, | |
233 | struct device_attribute *attr, char *buf) | |
234 | { | |
235 | struct sdw_slave *slave = dev_to_sdw_dev(dev); | |
236 | ||
237 | return sprintf(buf, "%s\n", slave_status[slave->status]); | |
238 | } | |
239 | static DEVICE_ATTR_RO(status); | |
240 | ||
241 | static ssize_t device_number_show(struct device *dev, | |
242 | struct device_attribute *attr, char *buf) | |
243 | { | |
244 | struct sdw_slave *slave = dev_to_sdw_dev(dev); | |
245 | ||
246 | if (slave->status == SDW_SLAVE_UNATTACHED) | |
247 | return sprintf(buf, "%s", "N/A"); | |
248 | else | |
249 | return sprintf(buf, "%d", slave->dev_num); | |
250 | } | |
251 | static DEVICE_ATTR_RO(device_number); | |
252 | ||
253 | static struct attribute *slave_status_attrs[] = { | |
254 | &dev_attr_status.attr, | |
255 | &dev_attr_device_number.attr, | |
256 | NULL, | |
257 | }; | |
258 | ||
259 | /* | |
260 | * we don't use ATTRIBUTES_GROUP here since the group is used in a | |
261 | * separate file and can't be handled as a static. | |
262 | */ | |
263 | static const struct attribute_group sdw_slave_status_attr_group = { | |
264 | .attrs = slave_status_attrs, | |
265 | }; | |
266 | ||
267 | const struct attribute_group *sdw_slave_status_attr_groups[] = { | |
268 | &sdw_slave_status_attr_group, | |
269 | NULL | |
270 | }; |