1 // SPDX-License-Identifier: GPL-2.0-only
2 // Copyright(c) 2017-2019 Intel Corporation.
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>
13 static struct dentry *sdw_debugfs_root;
15 void sdw_bus_debugfs_init(struct sdw_bus *bus)
19 if (!sdw_debugfs_root)
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);
27 void sdw_bus_debugfs_exit(struct sdw_bus *bus)
29 debugfs_remove_recursive(bus->debugfs);
32 #define RD_BUF (3 * PAGE_SIZE)
34 static ssize_t sdw_sprintf(struct sdw_slave *slave,
35 char *buf, size_t pos, unsigned int reg)
39 value = sdw_read_no_pm(slave, reg);
42 return scnprintf(buf + pos, RD_BUF - pos, "%3x\tXX\n", reg);
44 return scnprintf(buf + pos, RD_BUF - pos,
45 "%3x\t%2x\n", reg, value);
48 static int sdw_slave_reg_show(struct seq_file *s_file, void *data)
50 struct sdw_slave *slave = s_file->private;
55 buf = kzalloc(RD_BUF, GFP_KERNEL);
59 ret = pm_runtime_resume_and_get(&slave->dev);
60 if (ret < 0 && ret != -EACCES) {
65 ret = scnprintf(buf, RD_BUF, "Register Value\n");
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);
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);
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);
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);
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
100 /* DP1..14 registers */
101 for (i = 1; SDW_VALID_PORT_RANGE(i); i++) {
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);
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);
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);
121 seq_printf(s_file, "%s", buf);
123 pm_runtime_mark_last_busy(&slave->dev);
124 pm_runtime_put(&slave->dev);
130 DEFINE_SHOW_ATTRIBUTE(sdw_slave_reg);
132 void sdw_slave_debugfs_init(struct sdw_slave *slave)
134 struct dentry *master;
138 master = slave->bus->debugfs;
140 /* create the debugfs slave-name */
141 snprintf(name, sizeof(name), "%s", dev_name(&slave->dev));
142 d = debugfs_create_dir(name, master);
144 debugfs_create_file("registers", 0400, d, slave, &sdw_slave_reg_fops);
149 void sdw_slave_debugfs_exit(struct sdw_slave *slave)
151 debugfs_remove_recursive(slave->debugfs);
154 void sdw_debugfs_init(void)
156 sdw_debugfs_root = debugfs_create_dir("soundwire", NULL);
159 void sdw_debugfs_exit(void)
161 debugfs_remove_recursive(sdw_debugfs_root);