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)			\
 70static 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}								\
 77static DEVICE_ATTR_RO(field)
 78
 79sdw_slave_attr(mipi_revision, "0x%x\n");
 80sdw_slave_attr(wake_capable, "%d\n");
 81sdw_slave_attr(test_mode_capable, "%d\n");
 82sdw_slave_attr(clk_stop_mode1, "%d\n");
 83sdw_slave_attr(simple_clk_stop_capable, "%d\n");
 84sdw_slave_attr(clk_stop_timeout, "%d\n");
 85sdw_slave_attr(ch_prep_timeout, "%d\n");
 86sdw_slave_attr(reset_behave, "%d\n");
 87sdw_slave_attr(high_PHY_capable, "%d\n");
 88sdw_slave_attr(paging_support, "%d\n");
 89sdw_slave_attr(bank_delay_support, "%d\n");
 90sdw_slave_attr(p15_behave, "%d\n");
 91sdw_slave_attr(master_count, "%d\n");
 92sdw_slave_attr(source_ports, "0x%x\n");
 93sdw_slave_attr(sink_ports, "0x%x\n");
 94
 95static 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}
102static DEVICE_ATTR_RO(modalias);
103
104static struct attribute *slave_attrs[] = {
105	&dev_attr_modalias.attr,
106	NULL,
107};
108ATTRIBUTE_GROUPS(slave);
109
110static 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 */
133static 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)				\
143static 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}									\
150static DEVICE_ATTR_RO(field)
151
152sdw_dp0_attr(max_word, "%d\n");
153sdw_dp0_attr(min_word, "%d\n");
154sdw_dp0_attr(BRA_flow_controlled, "%d\n");
155sdw_dp0_attr(simple_ch_prep_sm, "%d\n");
156sdw_dp0_attr(imp_def_interrupts, "0x%x\n");
157
158static 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}
172static DEVICE_ATTR_RO(words);
173
174static 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 */
188static const struct attribute_group dp0_group = {
189	.attrs = dp0_attrs,
190	.name = "dp0",
191};
192
193int 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 */
225static 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
232static 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}
239static DEVICE_ATTR_RO(status);
240
241static 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}
251static DEVICE_ATTR_RO(device_number);
252
253static 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 */
263static const struct attribute_group sdw_slave_status_attr_group = {
264	.attrs	= slave_status_attrs,
265};
266
267const struct attribute_group *sdw_slave_status_attr_groups[] = {
268	&sdw_slave_status_attr_group,
269	NULL
270};