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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  *  Support for audio capture
0004  *  PCI function #1 of the cx2388x.
0005  *
0006  *    (c) 2007 Trent Piepho <xyzzy@speakeasy.org>
0007  *    (c) 2005,2006 Ricardo Cerqueira <v4l@cerqueira.org>
0008  *    (c) 2005 Mauro Carvalho Chehab <mchehab@kernel.org>
0009  *    Based on a dummy cx88 module by Gerd Knorr <kraxel@bytesex.org>
0010  *    Based on dummy.c by Jaroslav Kysela <perex@perex.cz>
0011  */
0012 
0013 #include "cx88.h"
0014 #include "cx88-reg.h"
0015 
0016 #include <linux/module.h>
0017 #include <linux/init.h>
0018 #include <linux/delay.h>
0019 #include <linux/device.h>
0020 #include <linux/interrupt.h>
0021 #include <linux/vmalloc.h>
0022 #include <linux/dma-mapping.h>
0023 #include <linux/pci.h>
0024 #include <linux/slab.h>
0025 
0026 #include <sound/core.h>
0027 #include <sound/pcm.h>
0028 #include <sound/pcm_params.h>
0029 #include <sound/control.h>
0030 #include <sound/initval.h>
0031 #include <sound/tlv.h>
0032 #include <media/i2c/wm8775.h>
0033 
0034 #define dprintk(level, fmt, arg...) do {                \
0035     if (debug + 1 > level)                      \
0036         printk(KERN_DEBUG pr_fmt("%s: alsa: " fmt),     \
0037             chip->core->name, ##arg);           \
0038 } while (0)
0039 
0040 /*
0041  * Data type declarations - Can be moded to a header file later
0042  */
0043 
0044 struct cx88_audio_buffer {
0045     unsigned int        bpl;
0046     struct cx88_riscmem risc;
0047     void            *vaddr;
0048     struct scatterlist  *sglist;
0049     int                     sglen;
0050     unsigned long       nr_pages;
0051 };
0052 
0053 struct cx88_audio_dev {
0054     struct cx88_core           *core;
0055     struct cx88_dmaqueue       q;
0056 
0057     /* pci i/o */
0058     struct pci_dev             *pci;
0059 
0060     /* audio controls */
0061     int                        irq;
0062 
0063     struct snd_card            *card;
0064 
0065     spinlock_t                 reg_lock;
0066     atomic_t           count;
0067 
0068     unsigned int               dma_size;
0069     unsigned int               period_size;
0070     unsigned int               num_periods;
0071 
0072     struct cx88_audio_buffer   *buf;
0073 
0074     struct snd_pcm_substream   *substream;
0075 };
0076 
0077 /*
0078  * Module global static vars
0079  */
0080 
0081 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;  /* Index 0-MAX */
0082 static const char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
0083 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
0084 
0085 module_param_array(enable, bool, NULL, 0444);
0086 MODULE_PARM_DESC(enable, "Enable cx88x soundcard. default enabled.");
0087 
0088 module_param_array(index, int, NULL, 0444);
0089 MODULE_PARM_DESC(index, "Index value for cx88x capture interface(s).");
0090 
0091 /*
0092  * Module macros
0093  */
0094 
0095 MODULE_DESCRIPTION("ALSA driver module for cx2388x based TV cards");
0096 MODULE_AUTHOR("Ricardo Cerqueira");
0097 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@kernel.org>");
0098 MODULE_LICENSE("GPL v2");
0099 MODULE_VERSION(CX88_VERSION);
0100 
0101 static unsigned int debug;
0102 module_param(debug, int, 0644);
0103 MODULE_PARM_DESC(debug, "enable debug messages");
0104 
0105 /*
0106  * Module specific functions
0107  */
0108 
0109 /*
0110  * BOARD Specific: Sets audio DMA
0111  */
0112 
0113 static int _cx88_start_audio_dma(struct cx88_audio_dev *chip)
0114 {
0115     struct cx88_audio_buffer *buf = chip->buf;
0116     struct cx88_core *core = chip->core;
0117     const struct sram_channel *audio_ch = &cx88_sram_channels[SRAM_CH25];
0118 
0119     /* Make sure RISC/FIFO are off before changing FIFO/RISC settings */
0120     cx_clear(MO_AUD_DMACNTRL, 0x11);
0121 
0122     /* setup fifo + format - out channel */
0123     cx88_sram_channel_setup(chip->core, audio_ch, buf->bpl, buf->risc.dma);
0124 
0125     /* sets bpl size */
0126     cx_write(MO_AUDD_LNGTH, buf->bpl);
0127 
0128     /* reset counter */
0129     cx_write(MO_AUDD_GPCNTRL, GP_COUNT_CONTROL_RESET);
0130     atomic_set(&chip->count, 0);
0131 
0132     dprintk(1,
0133         "Start audio DMA, %d B/line, %d lines/FIFO, %d periods, %d byte buffer\n",
0134         buf->bpl, cx_read(audio_ch->cmds_start + 8) >> 1,
0135         chip->num_periods, buf->bpl * chip->num_periods);
0136 
0137     /* Enables corresponding bits at AUD_INT_STAT */
0138     cx_write(MO_AUD_INTMSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
0139                 AUD_INT_DN_RISCI2 | AUD_INT_DN_RISCI1);
0140 
0141     /* Clean any pending interrupt bits already set */
0142     cx_write(MO_AUD_INTSTAT, ~0);
0143 
0144     /* enable audio irqs */
0145     cx_set(MO_PCI_INTMSK, chip->core->pci_irqmask | PCI_INT_AUDINT);
0146 
0147     /* start dma */
0148 
0149     /* Enables Risc Processor */
0150     cx_set(MO_DEV_CNTRL2, (1 << 5));
0151     /* audio downstream FIFO and RISC enable */
0152     cx_set(MO_AUD_DMACNTRL, 0x11);
0153 
0154     if (debug)
0155         cx88_sram_channel_dump(chip->core, audio_ch);
0156 
0157     return 0;
0158 }
0159 
0160 /*
0161  * BOARD Specific: Resets audio DMA
0162  */
0163 static int _cx88_stop_audio_dma(struct cx88_audio_dev *chip)
0164 {
0165     struct cx88_core *core = chip->core;
0166 
0167     dprintk(1, "Stopping audio DMA\n");
0168 
0169     /* stop dma */
0170     cx_clear(MO_AUD_DMACNTRL, 0x11);
0171 
0172     /* disable irqs */
0173     cx_clear(MO_PCI_INTMSK, PCI_INT_AUDINT);
0174     cx_clear(MO_AUD_INTMSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
0175                 AUD_INT_DN_RISCI2 | AUD_INT_DN_RISCI1);
0176 
0177     if (debug)
0178         cx88_sram_channel_dump(chip->core,
0179                        &cx88_sram_channels[SRAM_CH25]);
0180 
0181     return 0;
0182 }
0183 
0184 #define MAX_IRQ_LOOP 50
0185 
0186 /*
0187  * BOARD Specific: IRQ dma bits
0188  */
0189 static const char *cx88_aud_irqs[32] = {
0190     "dn_risci1", "up_risci1", "rds_dn_risc1", /* 0-2 */
0191     NULL,                     /* reserved */
0192     "dn_risci2", "up_risci2", "rds_dn_risc2", /* 4-6 */
0193     NULL,                     /* reserved */
0194     "dnf_of", "upf_uf", "rds_dnf_uf",     /* 8-10 */
0195     NULL,                     /* reserved */
0196     "dn_sync", "up_sync", "rds_dn_sync",      /* 12-14 */
0197     NULL,                     /* reserved */
0198     "opc_err", "par_err", "rip_err",      /* 16-18 */
0199     "pci_abort", "ber_irq", "mchg_irq"    /* 19-21 */
0200 };
0201 
0202 /*
0203  * BOARD Specific: Threats IRQ audio specific calls
0204  */
0205 static void cx8801_aud_irq(struct cx88_audio_dev *chip)
0206 {
0207     struct cx88_core *core = chip->core;
0208     u32 status, mask;
0209 
0210     status = cx_read(MO_AUD_INTSTAT);
0211     mask   = cx_read(MO_AUD_INTMSK);
0212     if (0 == (status & mask))
0213         return;
0214     cx_write(MO_AUD_INTSTAT, status);
0215     if (debug > 1  ||  (status & mask & ~0xff))
0216         cx88_print_irqbits("irq aud",
0217                    cx88_aud_irqs, ARRAY_SIZE(cx88_aud_irqs),
0218                    status, mask);
0219     /* risc op code error */
0220     if (status & AUD_INT_OPC_ERR) {
0221         pr_warn("Audio risc op code error\n");
0222         cx_clear(MO_AUD_DMACNTRL, 0x11);
0223         cx88_sram_channel_dump(core, &cx88_sram_channels[SRAM_CH25]);
0224     }
0225     if (status & AUD_INT_DN_SYNC) {
0226         dprintk(1, "Downstream sync error\n");
0227         cx_write(MO_AUDD_GPCNTRL, GP_COUNT_CONTROL_RESET);
0228         return;
0229     }
0230     /* risc1 downstream */
0231     if (status & AUD_INT_DN_RISCI1) {
0232         atomic_set(&chip->count, cx_read(MO_AUDD_GPCNT));
0233         snd_pcm_period_elapsed(chip->substream);
0234     }
0235     /* FIXME: Any other status should deserve a special handling? */
0236 }
0237 
0238 /*
0239  * BOARD Specific: Handles IRQ calls
0240  */
0241 static irqreturn_t cx8801_irq(int irq, void *dev_id)
0242 {
0243     struct cx88_audio_dev *chip = dev_id;
0244     struct cx88_core *core = chip->core;
0245     u32 status;
0246     int loop, handled = 0;
0247 
0248     for (loop = 0; loop < MAX_IRQ_LOOP; loop++) {
0249         status = cx_read(MO_PCI_INTSTAT) &
0250             (core->pci_irqmask | PCI_INT_AUDINT);
0251         if (status == 0)
0252             goto out;
0253         dprintk(3, "cx8801_irq loop %d/%d, status %x\n",
0254             loop, MAX_IRQ_LOOP, status);
0255         handled = 1;
0256         cx_write(MO_PCI_INTSTAT, status);
0257 
0258         if (status & core->pci_irqmask)
0259             cx88_core_irq(core, status);
0260         if (status & PCI_INT_AUDINT)
0261             cx8801_aud_irq(chip);
0262     }
0263 
0264     if (loop == MAX_IRQ_LOOP) {
0265         pr_err("IRQ loop detected, disabling interrupts\n");
0266         cx_clear(MO_PCI_INTMSK, PCI_INT_AUDINT);
0267     }
0268 
0269  out:
0270     return IRQ_RETVAL(handled);
0271 }
0272 
0273 static int cx88_alsa_dma_init(struct cx88_audio_dev *chip,
0274                   unsigned long nr_pages)
0275 {
0276     struct cx88_audio_buffer *buf = chip->buf;
0277     struct page *pg;
0278     int i;
0279 
0280     buf->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT);
0281     if (!buf->vaddr) {
0282         dprintk(1, "vmalloc_32(%lu pages) failed\n", nr_pages);
0283         return -ENOMEM;
0284     }
0285 
0286     dprintk(1, "vmalloc is at addr %p, size=%lu\n",
0287         buf->vaddr, nr_pages << PAGE_SHIFT);
0288 
0289     memset(buf->vaddr, 0, nr_pages << PAGE_SHIFT);
0290     buf->nr_pages = nr_pages;
0291 
0292     buf->sglist = vzalloc(array_size(sizeof(*buf->sglist), buf->nr_pages));
0293     if (!buf->sglist)
0294         goto vzalloc_err;
0295 
0296     sg_init_table(buf->sglist, buf->nr_pages);
0297     for (i = 0; i < buf->nr_pages; i++) {
0298         pg = vmalloc_to_page(buf->vaddr + i * PAGE_SIZE);
0299         if (!pg)
0300             goto vmalloc_to_page_err;
0301         sg_set_page(&buf->sglist[i], pg, PAGE_SIZE, 0);
0302     }
0303     return 0;
0304 
0305 vmalloc_to_page_err:
0306     vfree(buf->sglist);
0307     buf->sglist = NULL;
0308 vzalloc_err:
0309     vfree(buf->vaddr);
0310     buf->vaddr = NULL;
0311     return -ENOMEM;
0312 }
0313 
0314 static int cx88_alsa_dma_map(struct cx88_audio_dev *dev)
0315 {
0316     struct cx88_audio_buffer *buf = dev->buf;
0317 
0318     buf->sglen = dma_map_sg(&dev->pci->dev, buf->sglist,
0319             buf->nr_pages, DMA_FROM_DEVICE);
0320 
0321     if (buf->sglen == 0) {
0322         pr_warn("%s: cx88_alsa_map_sg failed\n", __func__);
0323         return -ENOMEM;
0324     }
0325     return 0;
0326 }
0327 
0328 static int cx88_alsa_dma_unmap(struct cx88_audio_dev *dev)
0329 {
0330     struct cx88_audio_buffer *buf = dev->buf;
0331 
0332     if (!buf->sglen)
0333         return 0;
0334 
0335     dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->nr_pages,
0336              DMA_FROM_DEVICE);
0337     buf->sglen = 0;
0338     return 0;
0339 }
0340 
0341 static int cx88_alsa_dma_free(struct cx88_audio_buffer *buf)
0342 {
0343     vfree(buf->sglist);
0344     buf->sglist = NULL;
0345     vfree(buf->vaddr);
0346     buf->vaddr = NULL;
0347     return 0;
0348 }
0349 
0350 static int dsp_buffer_free(struct cx88_audio_dev *chip)
0351 {
0352     struct cx88_riscmem *risc = &chip->buf->risc;
0353 
0354     WARN_ON(!chip->dma_size);
0355 
0356     dprintk(2, "Freeing buffer\n");
0357     cx88_alsa_dma_unmap(chip);
0358     cx88_alsa_dma_free(chip->buf);
0359     if (risc->cpu)
0360         dma_free_coherent(&chip->pci->dev, risc->size, risc->cpu,
0361                   risc->dma);
0362     kfree(chip->buf);
0363 
0364     chip->buf = NULL;
0365 
0366     return 0;
0367 }
0368 
0369 /*
0370  * ALSA PCM Interface
0371  */
0372 
0373 /*
0374  * Digital hardware definition
0375  */
0376 #define DEFAULT_FIFO_SIZE   4096
0377 static const struct snd_pcm_hardware snd_cx88_digital_hw = {
0378     .info = SNDRV_PCM_INFO_MMAP |
0379         SNDRV_PCM_INFO_INTERLEAVED |
0380         SNDRV_PCM_INFO_BLOCK_TRANSFER |
0381         SNDRV_PCM_INFO_MMAP_VALID,
0382     .formats = SNDRV_PCM_FMTBIT_S16_LE,
0383 
0384     .rates =        SNDRV_PCM_RATE_48000,
0385     .rate_min =     48000,
0386     .rate_max =     48000,
0387     .channels_min = 2,
0388     .channels_max = 2,
0389     /*
0390      * Analog audio output will be full of clicks and pops if there
0391      * are not exactly four lines in the SRAM FIFO buffer.
0392      */
0393     .period_bytes_min = DEFAULT_FIFO_SIZE / 4,
0394     .period_bytes_max = DEFAULT_FIFO_SIZE / 4,
0395     .periods_min = 1,
0396     .periods_max = 1024,
0397     .buffer_bytes_max = (1024 * 1024),
0398 };
0399 
0400 /*
0401  * audio pcm capture open callback
0402  */
0403 static int snd_cx88_pcm_open(struct snd_pcm_substream *substream)
0404 {
0405     struct cx88_audio_dev *chip = snd_pcm_substream_chip(substream);
0406     struct snd_pcm_runtime *runtime = substream->runtime;
0407     int err;
0408 
0409     if (!chip) {
0410         pr_err("BUG: cx88 can't find device struct. Can't proceed with open\n");
0411         return -ENODEV;
0412     }
0413 
0414     err = snd_pcm_hw_constraint_pow2(runtime, 0,
0415                      SNDRV_PCM_HW_PARAM_PERIODS);
0416     if (err < 0)
0417         goto _error;
0418 
0419     chip->substream = substream;
0420 
0421     runtime->hw = snd_cx88_digital_hw;
0422 
0423     if (cx88_sram_channels[SRAM_CH25].fifo_size != DEFAULT_FIFO_SIZE) {
0424         unsigned int bpl = cx88_sram_channels[SRAM_CH25].fifo_size / 4;
0425 
0426         bpl &= ~7; /* must be multiple of 8 */
0427         runtime->hw.period_bytes_min = bpl;
0428         runtime->hw.period_bytes_max = bpl;
0429     }
0430 
0431     return 0;
0432 _error:
0433     dprintk(1, "Error opening PCM!\n");
0434     return err;
0435 }
0436 
0437 /*
0438  * audio close callback
0439  */
0440 static int snd_cx88_close(struct snd_pcm_substream *substream)
0441 {
0442     return 0;
0443 }
0444 
0445 /*
0446  * hw_params callback
0447  */
0448 static int snd_cx88_hw_params(struct snd_pcm_substream *substream,
0449                   struct snd_pcm_hw_params *hw_params)
0450 {
0451     struct cx88_audio_dev *chip = snd_pcm_substream_chip(substream);
0452 
0453     struct cx88_audio_buffer *buf;
0454     int ret;
0455 
0456     if (substream->runtime->dma_area) {
0457         dsp_buffer_free(chip);
0458         substream->runtime->dma_area = NULL;
0459     }
0460 
0461     chip->period_size = params_period_bytes(hw_params);
0462     chip->num_periods = params_periods(hw_params);
0463     chip->dma_size = chip->period_size * params_periods(hw_params);
0464 
0465     WARN_ON(!chip->dma_size);
0466     WARN_ON(chip->num_periods & (chip->num_periods - 1));
0467 
0468     buf = kzalloc(sizeof(*buf), GFP_KERNEL);
0469     if (!buf)
0470         return -ENOMEM;
0471 
0472     chip->buf = buf;
0473     buf->bpl = chip->period_size;
0474 
0475     ret = cx88_alsa_dma_init(chip,
0476                  (PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT));
0477     if (ret < 0)
0478         goto error;
0479 
0480     ret = cx88_alsa_dma_map(chip);
0481     if (ret < 0)
0482         goto error;
0483 
0484     ret = cx88_risc_databuffer(chip->pci, &buf->risc, buf->sglist,
0485                    chip->period_size, chip->num_periods, 1);
0486     if (ret < 0)
0487         goto error;
0488 
0489     /* Loop back to start of program */
0490     buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
0491     buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
0492 
0493     substream->runtime->dma_area = chip->buf->vaddr;
0494     substream->runtime->dma_bytes = chip->dma_size;
0495     substream->runtime->dma_addr = 0;
0496     return 0;
0497 
0498 error:
0499     kfree(buf);
0500     return ret;
0501 }
0502 
0503 /*
0504  * hw free callback
0505  */
0506 static int snd_cx88_hw_free(struct snd_pcm_substream *substream)
0507 {
0508     struct cx88_audio_dev *chip = snd_pcm_substream_chip(substream);
0509 
0510     if (substream->runtime->dma_area) {
0511         dsp_buffer_free(chip);
0512         substream->runtime->dma_area = NULL;
0513     }
0514 
0515     return 0;
0516 }
0517 
0518 /*
0519  * prepare callback
0520  */
0521 static int snd_cx88_prepare(struct snd_pcm_substream *substream)
0522 {
0523     return 0;
0524 }
0525 
0526 /*
0527  * trigger callback
0528  */
0529 static int snd_cx88_card_trigger(struct snd_pcm_substream *substream, int cmd)
0530 {
0531     struct cx88_audio_dev *chip = snd_pcm_substream_chip(substream);
0532     int err;
0533 
0534     /* Local interrupts are already disabled by ALSA */
0535     spin_lock(&chip->reg_lock);
0536 
0537     switch (cmd) {
0538     case SNDRV_PCM_TRIGGER_START:
0539         err = _cx88_start_audio_dma(chip);
0540         break;
0541     case SNDRV_PCM_TRIGGER_STOP:
0542         err = _cx88_stop_audio_dma(chip);
0543         break;
0544     default:
0545         err =  -EINVAL;
0546         break;
0547     }
0548 
0549     spin_unlock(&chip->reg_lock);
0550 
0551     return err;
0552 }
0553 
0554 /*
0555  * pointer callback
0556  */
0557 static snd_pcm_uframes_t snd_cx88_pointer(struct snd_pcm_substream *substream)
0558 {
0559     struct cx88_audio_dev *chip = snd_pcm_substream_chip(substream);
0560     struct snd_pcm_runtime *runtime = substream->runtime;
0561     u16 count;
0562 
0563     count = atomic_read(&chip->count);
0564 
0565 //  dprintk(2, "%s - count %d (+%u), period %d, frame %lu\n", __func__,
0566 //      count, new, count & (runtime->periods-1),
0567 //      runtime->period_size * (count & (runtime->periods-1)));
0568     return runtime->period_size * (count & (runtime->periods - 1));
0569 }
0570 
0571 /*
0572  * page callback (needed for mmap)
0573  */
0574 static struct page *snd_cx88_page(struct snd_pcm_substream *substream,
0575                   unsigned long offset)
0576 {
0577     void *pageptr = substream->runtime->dma_area + offset;
0578 
0579     return vmalloc_to_page(pageptr);
0580 }
0581 
0582 /*
0583  * operators
0584  */
0585 static const struct snd_pcm_ops snd_cx88_pcm_ops = {
0586     .open = snd_cx88_pcm_open,
0587     .close = snd_cx88_close,
0588     .hw_params = snd_cx88_hw_params,
0589     .hw_free = snd_cx88_hw_free,
0590     .prepare = snd_cx88_prepare,
0591     .trigger = snd_cx88_card_trigger,
0592     .pointer = snd_cx88_pointer,
0593     .page = snd_cx88_page,
0594 };
0595 
0596 /*
0597  * create a PCM device
0598  */
0599 static int snd_cx88_pcm(struct cx88_audio_dev *chip, int device,
0600             const char *name)
0601 {
0602     int err;
0603     struct snd_pcm *pcm;
0604 
0605     err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm);
0606     if (err < 0)
0607         return err;
0608     pcm->private_data = chip;
0609     strscpy(pcm->name, name, sizeof(pcm->name));
0610     snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx88_pcm_ops);
0611 
0612     return 0;
0613 }
0614 
0615 /*
0616  * CONTROL INTERFACE
0617  */
0618 static int snd_cx88_volume_info(struct snd_kcontrol *kcontrol,
0619                 struct snd_ctl_elem_info *info)
0620 {
0621     info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
0622     info->count = 2;
0623     info->value.integer.min = 0;
0624     info->value.integer.max = 0x3f;
0625 
0626     return 0;
0627 }
0628 
0629 static int snd_cx88_volume_get(struct snd_kcontrol *kcontrol,
0630                    struct snd_ctl_elem_value *value)
0631 {
0632     struct cx88_audio_dev *chip = snd_kcontrol_chip(kcontrol);
0633     struct cx88_core *core = chip->core;
0634     int vol = 0x3f - (cx_read(AUD_VOL_CTL) & 0x3f),
0635         bal = cx_read(AUD_BAL_CTL);
0636 
0637     value->value.integer.value[(bal & 0x40) ? 0 : 1] = vol;
0638     vol -= (bal & 0x3f);
0639     value->value.integer.value[(bal & 0x40) ? 1 : 0] = vol < 0 ? 0 : vol;
0640 
0641     return 0;
0642 }
0643 
0644 static void snd_cx88_wm8775_volume_put(struct snd_kcontrol *kcontrol,
0645                        struct snd_ctl_elem_value *value)
0646 {
0647     struct cx88_audio_dev *chip = snd_kcontrol_chip(kcontrol);
0648     struct cx88_core *core = chip->core;
0649     u16 left = value->value.integer.value[0];
0650     u16 right = value->value.integer.value[1];
0651     int v, b;
0652 
0653     /* Pass volume & balance onto any WM8775 */
0654     if (left >= right) {
0655         v = left << 10;
0656         b = left ? (0x8000 * right) / left : 0x8000;
0657     } else {
0658         v = right << 10;
0659         b = right ? 0xffff - (0x8000 * left) / right : 0x8000;
0660     }
0661     wm8775_s_ctrl(core, V4L2_CID_AUDIO_VOLUME, v);
0662     wm8775_s_ctrl(core, V4L2_CID_AUDIO_BALANCE, b);
0663 }
0664 
0665 /* OK - TODO: test it */
0666 static int snd_cx88_volume_put(struct snd_kcontrol *kcontrol,
0667                    struct snd_ctl_elem_value *value)
0668 {
0669     struct cx88_audio_dev *chip = snd_kcontrol_chip(kcontrol);
0670     struct cx88_core *core = chip->core;
0671     int left, right, v, b;
0672     int changed = 0;
0673     u32 old;
0674 
0675     if (core->sd_wm8775)
0676         snd_cx88_wm8775_volume_put(kcontrol, value);
0677 
0678     left = value->value.integer.value[0] & 0x3f;
0679     right = value->value.integer.value[1] & 0x3f;
0680     b = right - left;
0681     if (b < 0) {
0682         v = 0x3f - left;
0683         b = (-b) | 0x40;
0684     } else {
0685         v = 0x3f - right;
0686     }
0687     /* Do we really know this will always be called with IRQs on? */
0688     spin_lock_irq(&chip->reg_lock);
0689     old = cx_read(AUD_VOL_CTL);
0690     if (v != (old & 0x3f)) {
0691         cx_swrite(SHADOW_AUD_VOL_CTL, AUD_VOL_CTL, (old & ~0x3f) | v);
0692         changed = 1;
0693     }
0694     if ((cx_read(AUD_BAL_CTL) & 0x7f) != b) {
0695         cx_write(AUD_BAL_CTL, b);
0696         changed = 1;
0697     }
0698     spin_unlock_irq(&chip->reg_lock);
0699 
0700     return changed;
0701 }
0702 
0703 static const DECLARE_TLV_DB_SCALE(snd_cx88_db_scale, -6300, 100, 0);
0704 
0705 static const struct snd_kcontrol_new snd_cx88_volume = {
0706     .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
0707     .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
0708           SNDRV_CTL_ELEM_ACCESS_TLV_READ,
0709     .name = "Analog-TV Volume",
0710     .info = snd_cx88_volume_info,
0711     .get = snd_cx88_volume_get,
0712     .put = snd_cx88_volume_put,
0713     .tlv.p = snd_cx88_db_scale,
0714 };
0715 
0716 static int snd_cx88_switch_get(struct snd_kcontrol *kcontrol,
0717                    struct snd_ctl_elem_value *value)
0718 {
0719     struct cx88_audio_dev *chip = snd_kcontrol_chip(kcontrol);
0720     struct cx88_core *core = chip->core;
0721     u32 bit = kcontrol->private_value;
0722 
0723     value->value.integer.value[0] = !(cx_read(AUD_VOL_CTL) & bit);
0724     return 0;
0725 }
0726 
0727 static int snd_cx88_switch_put(struct snd_kcontrol *kcontrol,
0728                    struct snd_ctl_elem_value *value)
0729 {
0730     struct cx88_audio_dev *chip = snd_kcontrol_chip(kcontrol);
0731     struct cx88_core *core = chip->core;
0732     u32 bit = kcontrol->private_value;
0733     int ret = 0;
0734     u32 vol;
0735 
0736     spin_lock_irq(&chip->reg_lock);
0737     vol = cx_read(AUD_VOL_CTL);
0738     if (value->value.integer.value[0] != !(vol & bit)) {
0739         vol ^= bit;
0740         cx_swrite(SHADOW_AUD_VOL_CTL, AUD_VOL_CTL, vol);
0741         /* Pass mute onto any WM8775 */
0742         if (core->sd_wm8775 && ((1 << 6) == bit))
0743             wm8775_s_ctrl(core,
0744                       V4L2_CID_AUDIO_MUTE, 0 != (vol & bit));
0745         ret = 1;
0746     }
0747     spin_unlock_irq(&chip->reg_lock);
0748     return ret;
0749 }
0750 
0751 static const struct snd_kcontrol_new snd_cx88_dac_switch = {
0752     .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
0753     .name = "Audio-Out Switch",
0754     .info = snd_ctl_boolean_mono_info,
0755     .get = snd_cx88_switch_get,
0756     .put = snd_cx88_switch_put,
0757     .private_value = (1 << 8),
0758 };
0759 
0760 static const struct snd_kcontrol_new snd_cx88_source_switch = {
0761     .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
0762     .name = "Analog-TV Switch",
0763     .info = snd_ctl_boolean_mono_info,
0764     .get = snd_cx88_switch_get,
0765     .put = snd_cx88_switch_put,
0766     .private_value = (1 << 6),
0767 };
0768 
0769 static int snd_cx88_alc_get(struct snd_kcontrol *kcontrol,
0770                 struct snd_ctl_elem_value *value)
0771 {
0772     struct cx88_audio_dev *chip = snd_kcontrol_chip(kcontrol);
0773     struct cx88_core *core = chip->core;
0774     s32 val;
0775 
0776     val = wm8775_g_ctrl(core, V4L2_CID_AUDIO_LOUDNESS);
0777     value->value.integer.value[0] = val ? 1 : 0;
0778     return 0;
0779 }
0780 
0781 static int snd_cx88_alc_put(struct snd_kcontrol *kcontrol,
0782                 struct snd_ctl_elem_value *value)
0783 {
0784     struct cx88_audio_dev *chip = snd_kcontrol_chip(kcontrol);
0785     struct cx88_core *core = chip->core;
0786 
0787     wm8775_s_ctrl(core, V4L2_CID_AUDIO_LOUDNESS,
0788               value->value.integer.value[0] != 0);
0789     return 0;
0790 }
0791 
0792 static const struct snd_kcontrol_new snd_cx88_alc_switch = {
0793     .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
0794     .name = "Line-In ALC Switch",
0795     .info = snd_ctl_boolean_mono_info,
0796     .get = snd_cx88_alc_get,
0797     .put = snd_cx88_alc_put,
0798 };
0799 
0800 /*
0801  * Basic Flow for Sound Devices
0802  */
0803 
0804 /*
0805  * PCI ID Table - 14f1:8801 and 14f1:8811 means function 1: Audio
0806  * Only boards with eeprom and byte 1 at eeprom=1 have it
0807  */
0808 
0809 static const struct pci_device_id cx88_audio_pci_tbl[] = {
0810     {0x14f1, 0x8801, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
0811     {0x14f1, 0x8811, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
0812     {0, }
0813 };
0814 MODULE_DEVICE_TABLE(pci, cx88_audio_pci_tbl);
0815 
0816 /*
0817  * Chip-specific destructor
0818  */
0819 
0820 static int snd_cx88_free(struct cx88_audio_dev *chip)
0821 {
0822     if (chip->irq >= 0)
0823         free_irq(chip->irq, chip);
0824 
0825     cx88_core_put(chip->core, chip->pci);
0826 
0827     pci_disable_device(chip->pci);
0828     return 0;
0829 }
0830 
0831 /*
0832  * Component Destructor
0833  */
0834 static void snd_cx88_dev_free(struct snd_card *card)
0835 {
0836     struct cx88_audio_dev *chip = card->private_data;
0837 
0838     snd_cx88_free(chip);
0839 }
0840 
0841 /*
0842  * Alsa Constructor - Component probe
0843  */
0844 
0845 static int devno;
0846 static int snd_cx88_create(struct snd_card *card, struct pci_dev *pci,
0847                struct cx88_audio_dev **rchip,
0848                struct cx88_core **core_ptr)
0849 {
0850     struct cx88_audio_dev   *chip;
0851     struct cx88_core    *core;
0852     int         err;
0853     unsigned char       pci_lat;
0854 
0855     *rchip = NULL;
0856 
0857     err = pci_enable_device(pci);
0858     if (err < 0)
0859         return err;
0860 
0861     pci_set_master(pci);
0862 
0863     chip = card->private_data;
0864 
0865     core = cx88_core_get(pci);
0866     if (!core) {
0867         err = -EINVAL;
0868         return err;
0869     }
0870 
0871     err = dma_set_mask(&pci->dev, DMA_BIT_MASK(32));
0872     if (err) {
0873         dprintk(0, "%s/1: Oops: no 32bit PCI DMA ???\n", core->name);
0874         cx88_core_put(core, pci);
0875         return err;
0876     }
0877 
0878     /* pci init */
0879     chip->card = card;
0880     chip->pci = pci;
0881     chip->irq = -1;
0882     spin_lock_init(&chip->reg_lock);
0883 
0884     chip->core = core;
0885 
0886     /* get irq */
0887     err = request_irq(chip->pci->irq, cx8801_irq,
0888               IRQF_SHARED, chip->core->name, chip);
0889     if (err < 0) {
0890         dprintk(0, "%s: can't get IRQ %d\n",
0891             chip->core->name, chip->pci->irq);
0892         return err;
0893     }
0894 
0895     /* print pci info */
0896     pci_read_config_byte(pci, PCI_LATENCY_TIMER, &pci_lat);
0897 
0898     dprintk(1,
0899         "ALSA %s/%i: found at %s, rev: %d, irq: %d, latency: %d, mmio: 0x%llx\n",
0900         core->name, devno,
0901         pci_name(pci), pci->revision, pci->irq,
0902         pci_lat, (unsigned long long)pci_resource_start(pci, 0));
0903 
0904     chip->irq = pci->irq;
0905     synchronize_irq(chip->irq);
0906 
0907     *rchip = chip;
0908     *core_ptr = core;
0909 
0910     return 0;
0911 }
0912 
0913 static int cx88_audio_initdev(struct pci_dev *pci,
0914                   const struct pci_device_id *pci_id)
0915 {
0916     struct snd_card     *card;
0917     struct cx88_audio_dev   *chip;
0918     struct cx88_core    *core = NULL;
0919     int         err;
0920 
0921     if (devno >= SNDRV_CARDS)
0922         return (-ENODEV);
0923 
0924     if (!enable[devno]) {
0925         ++devno;
0926         return (-ENOENT);
0927     }
0928 
0929     err = snd_card_new(&pci->dev, index[devno], id[devno], THIS_MODULE,
0930                sizeof(struct cx88_audio_dev), &card);
0931     if (err < 0)
0932         return err;
0933 
0934     card->private_free = snd_cx88_dev_free;
0935 
0936     err = snd_cx88_create(card, pci, &chip, &core);
0937     if (err < 0)
0938         goto error;
0939 
0940     err = snd_cx88_pcm(chip, 0, "CX88 Digital");
0941     if (err < 0)
0942         goto error;
0943 
0944     err = snd_ctl_add(card, snd_ctl_new1(&snd_cx88_volume, chip));
0945     if (err < 0)
0946         goto error;
0947     err = snd_ctl_add(card, snd_ctl_new1(&snd_cx88_dac_switch, chip));
0948     if (err < 0)
0949         goto error;
0950     err = snd_ctl_add(card, snd_ctl_new1(&snd_cx88_source_switch, chip));
0951     if (err < 0)
0952         goto error;
0953 
0954     /* If there's a wm8775 then add a Line-In ALC switch */
0955     if (core->sd_wm8775) {
0956         err = snd_ctl_add(card, snd_ctl_new1(&snd_cx88_alc_switch, chip));
0957         if (err < 0)
0958             goto error;
0959     }
0960 
0961     strscpy(card->driver, "CX88x", sizeof(card->driver));
0962     sprintf(card->shortname, "Conexant CX%x", pci->device);
0963     sprintf(card->longname, "%s at %#llx",
0964         card->shortname,
0965         (unsigned long long)pci_resource_start(pci, 0));
0966     strscpy(card->mixername, "CX88", sizeof(card->mixername));
0967 
0968     dprintk(0, "%s/%i: ALSA support for cx2388x boards\n",
0969         card->driver, devno);
0970 
0971     err = snd_card_register(card);
0972     if (err < 0)
0973         goto error;
0974     pci_set_drvdata(pci, card);
0975 
0976     devno++;
0977     return 0;
0978 
0979 error:
0980     snd_card_free(card);
0981     return err;
0982 }
0983 
0984 /*
0985  * ALSA destructor
0986  */
0987 static void cx88_audio_finidev(struct pci_dev *pci)
0988 {
0989     struct snd_card *card = pci_get_drvdata(pci);
0990 
0991     snd_card_free(card);
0992 
0993     devno--;
0994 }
0995 
0996 /*
0997  * PCI driver definition
0998  */
0999 
1000 static struct pci_driver cx88_audio_pci_driver = {
1001     .name     = "cx88_audio",
1002     .id_table = cx88_audio_pci_tbl,
1003     .probe    = cx88_audio_initdev,
1004     .remove   = cx88_audio_finidev,
1005 };
1006 
1007 module_pci_driver(cx88_audio_pci_driver);
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