cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

chip.c (5206B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Linux driver for TerraTec DMX 6Fire USB
      4 *
      5 * Main routines and module definitions.
      6 *
      7 * Author:	Torsten Schenk <torsten.schenk@zoho.com>
      8 * Created:	Jan 01, 2011
      9 * Copyright:	(C) Torsten Schenk
     10 */
     11
     12#include "chip.h"
     13#include "firmware.h"
     14#include "pcm.h"
     15#include "control.h"
     16#include "comm.h"
     17#include "midi.h"
     18
     19#include <linux/moduleparam.h>
     20#include <linux/interrupt.h>
     21#include <linux/module.h>
     22#include <linux/init.h>
     23#include <linux/gfp.h>
     24#include <sound/initval.h>
     25
     26MODULE_AUTHOR("Torsten Schenk <torsten.schenk@zoho.com>");
     27MODULE_DESCRIPTION("TerraTec DMX 6Fire USB audio driver");
     28MODULE_LICENSE("GPL v2");
     29
     30static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-max */
     31static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* Id for card */
     32static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP; /* Enable card */
     33static struct sfire_chip *chips[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;
     34static struct usb_device *devices[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;
     35
     36module_param_array(index, int, NULL, 0444);
     37MODULE_PARM_DESC(index, "Index value for the 6fire sound device");
     38module_param_array(id, charp, NULL, 0444);
     39MODULE_PARM_DESC(id, "ID string for the 6fire sound device.");
     40module_param_array(enable, bool, NULL, 0444);
     41MODULE_PARM_DESC(enable, "Enable the 6fire sound device.");
     42
     43static DEFINE_MUTEX(register_mutex);
     44
     45static void usb6fire_chip_abort(struct sfire_chip *chip)
     46{
     47	if (chip) {
     48		if (chip->pcm)
     49			usb6fire_pcm_abort(chip);
     50		if (chip->midi)
     51			usb6fire_midi_abort(chip);
     52		if (chip->comm)
     53			usb6fire_comm_abort(chip);
     54		if (chip->control)
     55			usb6fire_control_abort(chip);
     56		if (chip->card) {
     57			snd_card_disconnect(chip->card);
     58			snd_card_free_when_closed(chip->card);
     59			chip->card = NULL;
     60		}
     61	}
     62}
     63
     64static void usb6fire_chip_destroy(struct sfire_chip *chip)
     65{
     66	if (chip) {
     67		if (chip->pcm)
     68			usb6fire_pcm_destroy(chip);
     69		if (chip->midi)
     70			usb6fire_midi_destroy(chip);
     71		if (chip->comm)
     72			usb6fire_comm_destroy(chip);
     73		if (chip->control)
     74			usb6fire_control_destroy(chip);
     75		if (chip->card)
     76			snd_card_free(chip->card);
     77	}
     78}
     79
     80static int usb6fire_chip_probe(struct usb_interface *intf,
     81			       const struct usb_device_id *usb_id)
     82{
     83	int ret;
     84	int i;
     85	struct sfire_chip *chip = NULL;
     86	struct usb_device *device = interface_to_usbdev(intf);
     87	int regidx = -1; /* index in module parameter array */
     88	struct snd_card *card = NULL;
     89
     90	/* look if we already serve this card and return if so */
     91	mutex_lock(&register_mutex);
     92	for (i = 0; i < SNDRV_CARDS; i++) {
     93		if (devices[i] == device) {
     94			if (chips[i])
     95				chips[i]->intf_count++;
     96			usb_set_intfdata(intf, chips[i]);
     97			mutex_unlock(&register_mutex);
     98			return 0;
     99		} else if (!devices[i] && regidx < 0)
    100			regidx = i;
    101	}
    102	if (regidx < 0) {
    103		mutex_unlock(&register_mutex);
    104		dev_err(&intf->dev, "too many cards registered.\n");
    105		return -ENODEV;
    106	}
    107	devices[regidx] = device;
    108	mutex_unlock(&register_mutex);
    109
    110	/* check, if firmware is present on device, upload it if not */
    111	ret = usb6fire_fw_init(intf);
    112	if (ret < 0)
    113		return ret;
    114	else if (ret == FW_NOT_READY) /* firmware update performed */
    115		return 0;
    116
    117	/* if we are here, card can be registered in alsa. */
    118	if (usb_set_interface(device, 0, 0) != 0) {
    119		dev_err(&intf->dev, "can't set first interface.\n");
    120		return -EIO;
    121	}
    122	ret = snd_card_new(&intf->dev, index[regidx], id[regidx],
    123			   THIS_MODULE, sizeof(struct sfire_chip), &card);
    124	if (ret < 0) {
    125		dev_err(&intf->dev, "cannot create alsa card.\n");
    126		return ret;
    127	}
    128	strcpy(card->driver, "6FireUSB");
    129	strcpy(card->shortname, "TerraTec DMX6FireUSB");
    130	sprintf(card->longname, "%s at %d:%d", card->shortname,
    131			device->bus->busnum, device->devnum);
    132
    133	chip = card->private_data;
    134	chips[regidx] = chip;
    135	chip->dev = device;
    136	chip->regidx = regidx;
    137	chip->intf_count = 1;
    138	chip->card = card;
    139
    140	ret = usb6fire_comm_init(chip);
    141	if (ret < 0)
    142		goto destroy_chip;
    143
    144	ret = usb6fire_midi_init(chip);
    145	if (ret < 0)
    146		goto destroy_chip;
    147
    148	ret = usb6fire_pcm_init(chip);
    149	if (ret < 0)
    150		goto destroy_chip;
    151
    152	ret = usb6fire_control_init(chip);
    153	if (ret < 0)
    154		goto destroy_chip;
    155
    156	ret = snd_card_register(card);
    157	if (ret < 0) {
    158		dev_err(&intf->dev, "cannot register card.");
    159		goto destroy_chip;
    160	}
    161	usb_set_intfdata(intf, chip);
    162	return 0;
    163
    164destroy_chip:
    165	usb6fire_chip_destroy(chip);
    166	return ret;
    167}
    168
    169static void usb6fire_chip_disconnect(struct usb_interface *intf)
    170{
    171	struct sfire_chip *chip;
    172
    173	chip = usb_get_intfdata(intf);
    174	if (chip) { /* if !chip, fw upload has been performed */
    175		chip->intf_count--;
    176		if (!chip->intf_count) {
    177			mutex_lock(&register_mutex);
    178			devices[chip->regidx] = NULL;
    179			chips[chip->regidx] = NULL;
    180			mutex_unlock(&register_mutex);
    181
    182			chip->shutdown = true;
    183			usb6fire_chip_abort(chip);
    184			usb6fire_chip_destroy(chip);
    185		}
    186	}
    187}
    188
    189static const struct usb_device_id device_table[] = {
    190	{
    191		.match_flags = USB_DEVICE_ID_MATCH_DEVICE,
    192		.idVendor = 0x0ccd,
    193		.idProduct = 0x0080
    194	},
    195	{}
    196};
    197
    198MODULE_DEVICE_TABLE(usb, device_table);
    199
    200static struct usb_driver usb_driver = {
    201	.name = "snd-usb-6fire",
    202	.probe = usb6fire_chip_probe,
    203	.disconnect = usb6fire_chip_disconnect,
    204	.id_table = device_table,
    205};
    206
    207module_usb_driver(usb_driver);