Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2// Copyright(c) 2017-2019 Intel Corporation.
3
4#include <linux/device.h>
5#include <linux/debugfs.h>
6#include <linux/mod_devicetable.h>
7#include <linux/pm_runtime.h>
8#include <linux/slab.h>
9#include <linux/soundwire/sdw.h>
10#include <linux/soundwire/sdw_registers.h>
11#include "bus.h"
12
13static struct dentry *sdw_debugfs_root;
14
15void sdw_bus_debugfs_init(struct sdw_bus *bus)
16{
17 char name[16];
18
19 if (!sdw_debugfs_root)
20 return;
21
22 /* create the debugfs master-N */
23 snprintf(name, sizeof(name), "master-%d-%d", bus->id, bus->link_id);
24 bus->debugfs = debugfs_create_dir(name, sdw_debugfs_root);
25}
26
27void sdw_bus_debugfs_exit(struct sdw_bus *bus)
28{
29 debugfs_remove_recursive(bus->debugfs);
30}
31
32#define RD_BUF (3 * PAGE_SIZE)
33
34static ssize_t sdw_sprintf(struct sdw_slave *slave,
35 char *buf, size_t pos, unsigned int reg)
36{
37 int value;
38
39 value = sdw_read_no_pm(slave, reg);
40
41 if (value < 0)
42 return scnprintf(buf + pos, RD_BUF - pos, "%3x\tXX\n", reg);
43 else
44 return scnprintf(buf + pos, RD_BUF - pos,
45 "%3x\t%2x\n", reg, value);
46}
47
48static int sdw_slave_reg_show(struct seq_file *s_file, void *data)
49{
50 struct sdw_slave *slave = s_file->private;
51 char *buf;
52 ssize_t ret;
53 int i, j;
54
55 buf = kzalloc(RD_BUF, GFP_KERNEL);
56 if (!buf)
57 return -ENOMEM;
58
59 ret = pm_runtime_resume_and_get(&slave->dev);
60 if (ret < 0 && ret != -EACCES) {
61 kfree(buf);
62 return ret;
63 }
64
65 ret = scnprintf(buf, RD_BUF, "Register Value\n");
66
67 /* DP0 non-banked registers */
68 ret += scnprintf(buf + ret, RD_BUF - ret, "\nDP0\n");
69 for (i = SDW_DP0_INT; i <= SDW_DP0_PREPARECTRL; i++)
70 ret += sdw_sprintf(slave, buf, ret, i);
71
72 /* DP0 Bank 0 registers */
73 ret += scnprintf(buf + ret, RD_BUF - ret, "Bank0\n");
74 ret += sdw_sprintf(slave, buf, ret, SDW_DP0_CHANNELEN);
75 for (i = SDW_DP0_SAMPLECTRL1; i <= SDW_DP0_LANECTRL; i++)
76 ret += sdw_sprintf(slave, buf, ret, i);
77
78 /* DP0 Bank 1 registers */
79 ret += scnprintf(buf + ret, RD_BUF - ret, "Bank1\n");
80 ret += sdw_sprintf(slave, buf, ret,
81 SDW_DP0_CHANNELEN + SDW_BANK1_OFFSET);
82 for (i = SDW_DP0_SAMPLECTRL1 + SDW_BANK1_OFFSET;
83 i <= SDW_DP0_LANECTRL + SDW_BANK1_OFFSET; i++)
84 ret += sdw_sprintf(slave, buf, ret, i);
85
86 /* SCP registers */
87 ret += scnprintf(buf + ret, RD_BUF - ret, "\nSCP\n");
88 for (i = SDW_SCP_INT1; i <= SDW_SCP_BANKDELAY; i++)
89 ret += sdw_sprintf(slave, buf, ret, i);
90 for (i = SDW_SCP_DEVID_0; i <= SDW_SCP_DEVID_5; i++)
91 ret += sdw_sprintf(slave, buf, ret, i);
92
93 /*
94 * SCP Bank 0/1 registers are read-only and cannot be
95 * retrieved from the Slave. The Master typically keeps track
96 * of the current frame size so the information can be found
97 * in other places
98 */
99
100 /* DP1..14 registers */
101 for (i = 1; SDW_VALID_PORT_RANGE(i); i++) {
102
103 /* DPi registers */
104 ret += scnprintf(buf + ret, RD_BUF - ret, "\nDP%d\n", i);
105 for (j = SDW_DPN_INT(i); j <= SDW_DPN_PREPARECTRL(i); j++)
106 ret += sdw_sprintf(slave, buf, ret, j);
107
108 /* DPi Bank0 registers */
109 ret += scnprintf(buf + ret, RD_BUF - ret, "Bank0\n");
110 for (j = SDW_DPN_CHANNELEN_B0(i);
111 j <= SDW_DPN_LANECTRL_B0(i); j++)
112 ret += sdw_sprintf(slave, buf, ret, j);
113
114 /* DPi Bank1 registers */
115 ret += scnprintf(buf + ret, RD_BUF - ret, "Bank1\n");
116 for (j = SDW_DPN_CHANNELEN_B1(i);
117 j <= SDW_DPN_LANECTRL_B1(i); j++)
118 ret += sdw_sprintf(slave, buf, ret, j);
119 }
120
121 seq_printf(s_file, "%s", buf);
122
123 pm_runtime_mark_last_busy(&slave->dev);
124 pm_runtime_put(&slave->dev);
125
126 kfree(buf);
127
128 return 0;
129}
130DEFINE_SHOW_ATTRIBUTE(sdw_slave_reg);
131
132void sdw_slave_debugfs_init(struct sdw_slave *slave)
133{
134 struct dentry *master;
135 struct dentry *d;
136 char name[32];
137
138 master = slave->bus->debugfs;
139
140 /* create the debugfs slave-name */
141 snprintf(name, sizeof(name), "%s", dev_name(&slave->dev));
142 d = debugfs_create_dir(name, master);
143
144 debugfs_create_file("registers", 0400, d, slave, &sdw_slave_reg_fops);
145
146 slave->debugfs = d;
147}
148
149void sdw_slave_debugfs_exit(struct sdw_slave *slave)
150{
151 debugfs_remove_recursive(slave->debugfs);
152}
153
154void sdw_debugfs_init(void)
155{
156 sdw_debugfs_root = debugfs_create_dir("soundwire", NULL);
157}
158
159void sdw_debugfs_exit(void)
160{
161 debugfs_remove_recursive(sdw_debugfs_root);
162}