+// SPDX-License-Identifier: GPL-2.0
+// Copyright(c) 2017-2019 Intel Corporation.
+
+#include <linux/device.h>
+#include <linux/debugfs.h>
+#include <linux/mod_devicetable.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", 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(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 = 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);
+ 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);
+}
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