debugfs.c

// SPDX-License-Identifier: GPL-2.0
//
// // Renesas R-Car debugfs support
//
// Copyright (c) 2021 Kuninori Morimoto <[email protected]>
//
//	> mount -t debugfs none /sys/kernel/debug
//	> cd /sys/kernel/debug/asoc/rcar-sound/ec500000.sound/rdai{N}/
//	> cat playback/xxx
//	> cat capture/xxx
//
#ifdef CONFIG_DEBUG_FS

#include <linux/debugfs.h>
#include "rsnd.h"

static int rsnd_debugfs_show(struct seq_file *m, void *v)
{
	struct rsnd_dai_stream *io = m->private;
	struct rsnd_mod *mod = rsnd_io_to_mod_ssi(io);
	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
	int i;

	/* adg is out of mods */
	rsnd_adg_clk_dbg_info(priv, m);

	for_each_rsnd_mod(i, mod, io) {
		u32 *status = mod->ops->get_status(mod, io, mod->type);

		seq_printf(m, "name: %s\n", rsnd_mod_name(mod));
		seq_printf(m, "status: %08x\n", *status);

		if (mod->ops->debug_info)
			mod->ops->debug_info(m, io, mod);
	}

	return 0;
}
DEFINE_SHOW_ATTRIBUTE(rsnd_debugfs);

void rsnd_debugfs_reg_show(struct seq_file *m, phys_addr_t _addr,
			   void __iomem *base, int offset, int size)
{
	int i, j;

	for (i = 0; i < size; i += 0x10) {
		phys_addr_t addr = _addr + offset + i;

		seq_printf(m, "%pa:", &addr);
		for (j = 0; j < 0x10; j += 0x4)
			seq_printf(m, " %08x", __raw_readl(base + offset + i + j));
		seq_puts(m, "\n");
	}
}

void rsnd_debugfs_mod_reg_show(struct seq_file *m, struct rsnd_mod *mod,
			       int reg_id, int offset, int size)
{
	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);

	rsnd_debugfs_reg_show(m,
			      rsnd_gen_get_phy_addr(priv, reg_id),
			      rsnd_gen_get_base_addr(priv, reg_id),
			      offset, size);
}

int rsnd_debugfs_probe(struct snd_soc_component *component)
{
	struct rsnd_priv *priv = dev_get_drvdata(component->dev);
	struct rsnd_dai *rdai;
	struct dentry *dir;
	char name[64];
	int i;

	/* Gen1 is not supported */
	if (rsnd_is_gen1(priv))
		return 0;

	for_each_rsnd_dai(rdai, priv, i) {
		/*
		 * created debugfs will be automatically
		 * removed, nothing to do for _remove.
		 * see
		 *	soc_cleanup_component_debugfs()
		 */
		snprintf(name, sizeof(name), "rdai%d", i);
		dir = debugfs_create_dir(name, component->debugfs_root);

		debugfs_create_file("playback", 0444, dir, &rdai->playback, &rsnd_debugfs_fops);
		debugfs_create_file("capture",  0444, dir, &rdai->capture,  &rsnd_debugfs_fops);
	}

	return 0;
}

#endif /* CONFIG_DEBUG_FS */