summaryrefslogtreecommitdiff
path: root/drivers/soundwire/debugfs.c
blob: dea782e0edc4be65fe79ee18e78336993c32780c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
// SPDX-License-Identifier: GPL-2.0-only
// Copyright(c) 2017-2019 Intel Corporation.

#include <linux/device.h>
#include <linux/debugfs.h>
#include <linux/mod_devicetable.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/soundwire/sdw.h>
#include <linux/soundwire/sdw_registers.h>
#include "bus.h"

static struct dentry *sdw_debugfs_root;

void sdw_bus_debugfs_init(struct sdw_bus *bus)
{
	char name[16];

	if (!sdw_debugfs_root)
		return;

	/* create the debugfs master-N */
	snprintf(name, sizeof(name), "master-%d-%d", bus->id, bus->link_id);
	bus->debugfs = debugfs_create_dir(name, sdw_debugfs_root);
}

void sdw_bus_debugfs_exit(struct sdw_bus *bus)
{
	debugfs_remove_recursive(bus->debugfs);
}

#define RD_BUF (3 * PAGE_SIZE)

static ssize_t sdw_sprintf(struct sdw_slave *slave,
			   char *buf, size_t pos, unsigned int reg)
{
	int value;

	value = sdw_read_no_pm(slave, reg);

	if (value < 0)
		return scnprintf(buf + pos, RD_BUF - pos, "%3x\tXX\n", reg);
	else
		return scnprintf(buf + pos, RD_BUF - pos,
				"%3x\t%2x\n", reg, value);
}

static int sdw_slave_reg_show(struct seq_file *s_file, void *data)
{
	struct sdw_slave *slave = s_file->private;
	char *buf;
	ssize_t ret;
	int i, j;

	buf = kzalloc(RD_BUF, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	ret = pm_runtime_resume_and_get(&slave->dev);
	if (ret < 0 && ret != -EACCES) {
		kfree(buf);
		return ret;
	}

	ret = scnprintf(buf, RD_BUF, "Register  Value\n");

	/* DP0 non-banked registers */
	ret += scnprintf(buf + ret, RD_BUF - ret, "\nDP0\n");
	for (i = SDW_DP0_INT; i <= SDW_DP0_PREPARECTRL; i++)
		ret += sdw_sprintf(slave, buf, ret, i);

	/* DP0 Bank 0 registers */
	ret += scnprintf(buf + ret, RD_BUF - ret, "Bank0\n");
	ret += sdw_sprintf(slave, buf, ret, SDW_DP0_CHANNELEN);
	for (i = SDW_DP0_SAMPLECTRL1; i <= SDW_DP0_LANECTRL; i++)
		ret += sdw_sprintf(slave, buf, ret, i);

	/* DP0 Bank 1 registers */
	ret += scnprintf(buf + ret, RD_BUF - ret, "Bank1\n");
	ret += sdw_sprintf(slave, buf, ret,
			SDW_DP0_CHANNELEN + SDW_BANK1_OFFSET);
	for (i = SDW_DP0_SAMPLECTRL1 + SDW_BANK1_OFFSET;
			i <= SDW_DP0_LANECTRL + SDW_BANK1_OFFSET; i++)
		ret += sdw_sprintf(slave, buf, ret, i);

	/* SCP registers */
	ret += scnprintf(buf + ret, RD_BUF - ret, "\nSCP\n");
	for (i = SDW_SCP_INT1; i <= SDW_SCP_BANKDELAY; i++)
		ret += sdw_sprintf(slave, buf, ret, i);
	for (i = SDW_SCP_DEVID_0; i <= SDW_SCP_DEVID_5; i++)
		ret += sdw_sprintf(slave, buf, ret, i);

	/*
	 * SCP Bank 0/1 registers are read-only and cannot be
	 * retrieved from the Slave. The Master typically keeps track
	 * of the current frame size so the information can be found
	 * in other places
	 */

	/* DP1..14 registers */
	for (i = 1; SDW_VALID_PORT_RANGE(i); i++) {

		/* DPi registers */
		ret += scnprintf(buf + ret, RD_BUF - ret, "\nDP%d\n", i);
		for (j = SDW_DPN_INT(i); j <= SDW_DPN_PREPARECTRL(i); j++)
			ret += sdw_sprintf(slave, buf, ret, j);

		/* DPi Bank0 registers */
		ret += scnprintf(buf + ret, RD_BUF - ret, "Bank0\n");
		for (j = SDW_DPN_CHANNELEN_B0(i);
		     j <= SDW_DPN_LANECTRL_B0(i); j++)
			ret += sdw_sprintf(slave, buf, ret, j);

		/* DPi Bank1 registers */
		ret += scnprintf(buf + ret, RD_BUF - ret, "Bank1\n");
		for (j = SDW_DPN_CHANNELEN_B1(i);
		     j <= SDW_DPN_LANECTRL_B1(i); j++)
			ret += sdw_sprintf(slave, buf, ret, j);
	}

	seq_printf(s_file, "%s", buf);

	pm_runtime_mark_last_busy(&slave->dev);
	pm_runtime_put(&slave->dev);

	kfree(buf);

	return 0;
}
DEFINE_SHOW_ATTRIBUTE(sdw_slave_reg);

void sdw_slave_debugfs_init(struct sdw_slave *slave)
{
	struct dentry *master;
	struct dentry *d;
	char name[32];

	master = slave->bus->debugfs;

	/* create the debugfs slave-name */
	snprintf(name, sizeof(name), "%s", dev_name(&slave->dev));
	d = debugfs_create_dir(name, master);

	debugfs_create_file("registers", 0400, d, slave, &sdw_slave_reg_fops);

	slave->debugfs = d;
}

void sdw_slave_debugfs_exit(struct sdw_slave *slave)
{
	debugfs_remove_recursive(slave->debugfs);
}

void sdw_debugfs_init(void)
{
	sdw_debugfs_root = debugfs_create_dir("soundwire", NULL);
}

void sdw_debugfs_exit(void)
{
	debugfs_remove_recursive(sdw_debugfs_root);
}