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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Driver for Tascam US-X2Y USB soundcards
0004  *
0005  * FPGA Loader + ALSA Startup
0006  *
0007  * Copyright (c) 2003 by Karsten Wiese <annabellesgarden@yahoo.de>
0008  */
0009 
0010 #include <linux/interrupt.h>
0011 #include <linux/slab.h>
0012 #include <linux/usb.h>
0013 #include <sound/core.h>
0014 #include <sound/memalloc.h>
0015 #include <sound/pcm.h>
0016 #include <sound/hwdep.h>
0017 #include "usx2y.h"
0018 #include "usbusx2y.h"
0019 #include "usX2Yhwdep.h"
0020 
0021 static vm_fault_t snd_us428ctls_vm_fault(struct vm_fault *vmf)
0022 {
0023     unsigned long offset;
0024     struct page *page;
0025     void *vaddr;
0026 
0027     snd_printdd("ENTER, start %lXh, pgoff %ld\n",
0028            vmf->vma->vm_start,
0029            vmf->pgoff);
0030 
0031     offset = vmf->pgoff << PAGE_SHIFT;
0032     vaddr = (char *)((struct usx2ydev *)vmf->vma->vm_private_data)->us428ctls_sharedmem + offset;
0033     page = virt_to_page(vaddr);
0034     get_page(page);
0035     vmf->page = page;
0036 
0037     snd_printdd("vaddr=%p made us428ctls_vm_fault() page %p\n",
0038             vaddr, page);
0039 
0040     return 0;
0041 }
0042 
0043 static const struct vm_operations_struct us428ctls_vm_ops = {
0044     .fault = snd_us428ctls_vm_fault,
0045 };
0046 
0047 static int snd_us428ctls_mmap(struct snd_hwdep *hw, struct file *filp, struct vm_area_struct *area)
0048 {
0049     unsigned long   size = (unsigned long)(area->vm_end - area->vm_start);
0050     struct usx2ydev *us428 = hw->private_data;
0051 
0052     // FIXME this hwdep interface is used twice: fpga download and mmap for controlling Lights etc. Maybe better using 2 hwdep devs?
0053     // so as long as the device isn't fully initialised yet we return -EBUSY here.
0054     if (!(us428->chip_status & USX2Y_STAT_CHIP_INIT))
0055         return -EBUSY;
0056 
0057     /* if userspace tries to mmap beyond end of our buffer, fail */
0058     if (size > US428_SHAREDMEM_PAGES) {
0059         snd_printd("%lu > %lu\n", size, (unsigned long)US428_SHAREDMEM_PAGES);
0060         return -EINVAL;
0061     }
0062 
0063     area->vm_ops = &us428ctls_vm_ops;
0064     area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
0065     area->vm_private_data = hw->private_data;
0066     return 0;
0067 }
0068 
0069 static __poll_t snd_us428ctls_poll(struct snd_hwdep *hw, struct file *file, poll_table *wait)
0070 {
0071     __poll_t    mask = 0;
0072     struct usx2ydev *us428 = hw->private_data;
0073     struct us428ctls_sharedmem *shm = us428->us428ctls_sharedmem;
0074 
0075     if (us428->chip_status & USX2Y_STAT_CHIP_HUP)
0076         return EPOLLHUP;
0077 
0078     poll_wait(file, &us428->us428ctls_wait_queue_head, wait);
0079 
0080     if (shm && shm->ctl_snapshot_last != shm->ctl_snapshot_red)
0081         mask |= EPOLLIN;
0082 
0083     return mask;
0084 }
0085 
0086 
0087 static int snd_usx2y_hwdep_dsp_status(struct snd_hwdep *hw,
0088                       struct snd_hwdep_dsp_status *info)
0089 {
0090     static const char * const type_ids[USX2Y_TYPE_NUMS] = {
0091         [USX2Y_TYPE_122] = "us122",
0092         [USX2Y_TYPE_224] = "us224",
0093         [USX2Y_TYPE_428] = "us428",
0094     };
0095     struct usx2ydev *us428 = hw->private_data;
0096     int id = -1;
0097 
0098     switch (le16_to_cpu(us428->dev->descriptor.idProduct)) {
0099     case USB_ID_US122:
0100         id = USX2Y_TYPE_122;
0101         break;
0102     case USB_ID_US224:
0103         id = USX2Y_TYPE_224;
0104         break;
0105     case USB_ID_US428:
0106         id = USX2Y_TYPE_428;
0107         break;
0108     }
0109     if (id < 0)
0110         return -ENODEV;
0111     strcpy(info->id, type_ids[id]);
0112     info->num_dsps = 2;     // 0: Prepad Data, 1: FPGA Code
0113     if (us428->chip_status & USX2Y_STAT_CHIP_INIT)
0114         info->chip_ready = 1;
0115     info->version = USX2Y_DRIVER_VERSION;
0116     return 0;
0117 }
0118 
0119 static int usx2y_create_usbmidi(struct snd_card *card)
0120 {
0121     static const struct snd_usb_midi_endpoint_info quirk_data_1 = {
0122         .out_ep = 0x06,
0123         .in_ep = 0x06,
0124         .out_cables =   0x001,
0125         .in_cables =    0x001
0126     };
0127     static const struct snd_usb_audio_quirk quirk_1 = {
0128         .vendor_name =  "TASCAM",
0129         .product_name = NAME_ALLCAPS,
0130         .ifnum =    0,
0131         .type = QUIRK_MIDI_FIXED_ENDPOINT,
0132         .data = &quirk_data_1
0133     };
0134     static const struct snd_usb_midi_endpoint_info quirk_data_2 = {
0135         .out_ep = 0x06,
0136         .in_ep = 0x06,
0137         .out_cables =   0x003,
0138         .in_cables =    0x003
0139     };
0140     static const struct snd_usb_audio_quirk quirk_2 = {
0141         .vendor_name =  "TASCAM",
0142         .product_name = "US428",
0143         .ifnum =    0,
0144         .type = QUIRK_MIDI_FIXED_ENDPOINT,
0145         .data = &quirk_data_2
0146     };
0147     struct usb_device *dev = usx2y(card)->dev;
0148     struct usb_interface *iface = usb_ifnum_to_if(dev, 0);
0149     const struct snd_usb_audio_quirk *quirk =
0150         le16_to_cpu(dev->descriptor.idProduct) == USB_ID_US428 ?
0151         &quirk_2 : &quirk_1;
0152 
0153     snd_printdd("%s\n", __func__);
0154     return snd_usbmidi_create(card, iface, &usx2y(card)->midi_list, quirk);
0155 }
0156 
0157 static int usx2y_create_alsa_devices(struct snd_card *card)
0158 {
0159     int err;
0160 
0161     err = usx2y_create_usbmidi(card);
0162     if (err < 0) {
0163         snd_printk(KERN_ERR "%s: usx2y_create_usbmidi error %i\n", __func__, err);
0164         return err;
0165     }
0166     err = usx2y_audio_create(card);
0167     if (err < 0)
0168         return err;
0169     err = usx2y_hwdep_pcm_new(card);
0170     if (err < 0)
0171         return err;
0172     err = snd_card_register(card);
0173     if (err < 0)
0174         return err;
0175     return 0;
0176 }
0177 
0178 static int snd_usx2y_hwdep_dsp_load(struct snd_hwdep *hw,
0179                     struct snd_hwdep_dsp_image *dsp)
0180 {
0181     struct usx2ydev *priv = hw->private_data;
0182     struct usb_device *dev = priv->dev;
0183     int lret, err;
0184     char *buf;
0185 
0186     snd_printdd("dsp_load %s\n", dsp->name);
0187 
0188     buf = memdup_user(dsp->image, dsp->length);
0189     if (IS_ERR(buf))
0190         return PTR_ERR(buf);
0191 
0192     err = usb_set_interface(dev, 0, 1);
0193     if (err)
0194         snd_printk(KERN_ERR "usb_set_interface error\n");
0195     else
0196         err = usb_bulk_msg(dev, usb_sndbulkpipe(dev, 2), buf, dsp->length, &lret, 6000);
0197     kfree(buf);
0198     if (err)
0199         return err;
0200     if (dsp->index == 1) {
0201         msleep(250);                // give the device some time
0202         err = usx2y_async_seq04_init(priv);
0203         if (err) {
0204             snd_printk(KERN_ERR "usx2y_async_seq04_init error\n");
0205             return err;
0206         }
0207         err = usx2y_in04_init(priv);
0208         if (err) {
0209             snd_printk(KERN_ERR "usx2y_in04_init error\n");
0210             return err;
0211         }
0212         err = usx2y_create_alsa_devices(hw->card);
0213         if (err) {
0214             snd_printk(KERN_ERR "usx2y_create_alsa_devices error %i\n", err);
0215             return err;
0216         }
0217         priv->chip_status |= USX2Y_STAT_CHIP_INIT;
0218         snd_printdd("%s: alsa all started\n", hw->name);
0219     }
0220     return err;
0221 }
0222 
0223 int usx2y_hwdep_new(struct snd_card *card, struct usb_device *device)
0224 {
0225     int err;
0226     struct snd_hwdep *hw;
0227     struct usx2ydev *us428 = usx2y(card);
0228 
0229     err = snd_hwdep_new(card, SND_USX2Y_LOADER_ID, 0, &hw);
0230     if (err < 0)
0231         return err;
0232 
0233     hw->iface = SNDRV_HWDEP_IFACE_USX2Y;
0234     hw->private_data = us428;
0235     hw->ops.dsp_status = snd_usx2y_hwdep_dsp_status;
0236     hw->ops.dsp_load = snd_usx2y_hwdep_dsp_load;
0237     hw->ops.mmap = snd_us428ctls_mmap;
0238     hw->ops.poll = snd_us428ctls_poll;
0239     hw->exclusive = 1;
0240     sprintf(hw->name, "/dev/bus/usb/%03d/%03d", device->bus->busnum, device->devnum);
0241 
0242     us428->us428ctls_sharedmem = alloc_pages_exact(US428_SHAREDMEM_PAGES, GFP_KERNEL);
0243     if (!us428->us428ctls_sharedmem)
0244         return -ENOMEM;
0245     memset(us428->us428ctls_sharedmem, -1, US428_SHAREDMEM_PAGES);
0246     us428->us428ctls_sharedmem->ctl_snapshot_last = -2;
0247 
0248     return 0;
0249 }