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 
modalias_show(struct device * dev,struct device_attribute * attr,char * buf)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  */
133 static const struct attribute_group sdw_slave_dev_attr_group = {
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 
words_show(struct device * dev,struct device_attribute * attr,char * buf)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 
sdw_slave_sysfs_init(struct sdw_slave * slave)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 }
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 
status_show(struct device * dev,struct device_attribute * attr,char * buf)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 
device_number_show(struct device * dev,struct device_attribute * attr,char * buf)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 };
271