src/kernel/linux/v4.19/sound/firewire/tascam/tascam-proc.c

/*
 * tascam-proc.h - a part of driver for TASCAM FireWire series
 *
 * Copyright (c) 2015 Takashi Sakamoto
 *
 * Licensed under the terms of the GNU General Public License, version 2.
 */

#include "./tascam.h"

static void proc_read_firmware(struct snd_info_entry *entry,
			       struct snd_info_buffer *buffer)
{
	struct snd_tscm *tscm = entry->private_data;
	__be32 data;
	unsigned int reg, fpga, arm, hw;
	int err;

	err = snd_fw_transaction(tscm->unit, TCODE_READ_QUADLET_REQUEST,
			TSCM_ADDR_BASE + TSCM_OFFSET_FIRMWARE_REGISTER,
			&data, sizeof(data), 0);
	if (err < 0)
		return;
	reg = be32_to_cpu(data);

	err = snd_fw_transaction(tscm->unit, TCODE_READ_QUADLET_REQUEST,
			TSCM_ADDR_BASE + TSCM_OFFSET_FIRMWARE_FPGA,
			&data, sizeof(data), 0);
	if (err < 0)
		return;
	fpga = be32_to_cpu(data);

	err = snd_fw_transaction(tscm->unit, TCODE_READ_QUADLET_REQUEST,
			TSCM_ADDR_BASE + TSCM_OFFSET_FIRMWARE_ARM,
			&data, sizeof(data), 0);
	if (err < 0)
		return;
	arm = be32_to_cpu(data);

	err = snd_fw_transaction(tscm->unit, TCODE_READ_QUADLET_REQUEST,
			TSCM_ADDR_BASE + TSCM_OFFSET_FIRMWARE_HW,
			&data, sizeof(data), 0);
	if (err < 0)
		return;
	hw = be32_to_cpu(data);

	snd_iprintf(buffer, "Register: %d (0x%08x)\n", reg & 0xffff, reg);
	snd_iprintf(buffer, "FPGA:     %d (0x%08x)\n", fpga & 0xffff, fpga);
	snd_iprintf(buffer, "ARM:      %d (0x%08x)\n", arm & 0xffff, arm);
	snd_iprintf(buffer, "Hardware: %d (0x%08x)\n", hw >> 16, hw);
}

static void add_node(struct snd_tscm *tscm, struct snd_info_entry *root,
		     const char *name,
		     void (*op)(struct snd_info_entry *e,
				struct snd_info_buffer *b))
{
	struct snd_info_entry *entry;

	entry = snd_info_create_card_entry(tscm->card, name, root);
	if (entry == NULL)
		return;

	snd_info_set_text_ops(entry, tscm, op);
	if (snd_info_register(entry) < 0)
		snd_info_free_entry(entry);
}

void snd_tscm_proc_init(struct snd_tscm *tscm)
{
	struct snd_info_entry *root;

	/*
	 * All nodes are automatically removed at snd_card_disconnect(),
	 * by following to link list.
	 */
	root = snd_info_create_card_entry(tscm->card, "firewire",
					  tscm->card->proc_root);
	if (root == NULL)
		return;
	root->mode = S_IFDIR | 0555;
	if (snd_info_register(root) < 0) {
		snd_info_free_entry(root);
		return;
	}

	add_node(tscm, root, "firmware", proc_read_firmware);
}