diff options
Diffstat (limited to 'drivers/media/pci/tw686x/tw686x-audio.c')
-rw-r--r-- | drivers/media/pci/tw686x/tw686x-audio.c | 386 |
1 files changed, 386 insertions, 0 deletions
diff --git a/drivers/media/pci/tw686x/tw686x-audio.c b/drivers/media/pci/tw686x/tw686x-audio.c new file mode 100644 index 000000000000..91459ab715b2 --- /dev/null +++ b/drivers/media/pci/tw686x/tw686x-audio.c @@ -0,0 +1,386 @@ +/* + * Copyright (C) 2015 VanguardiaSur - www.vanguardiasur.com.ar + * + * Based on the audio support from the tw6869 driver: + * Copyright 2015 www.starterkit.ru <info@starterkit.ru> + * + * Based on: + * Driver for Intersil|Techwell TW6869 based DVR cards + * (c) 2011-12 liran <jli11@intersil.com> [Intersil|Techwell China] + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2 of the GNU General Public License + * as published by the Free Software Foundation. + */ + +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/kmod.h> +#include <linux/mutex.h> +#include <linux/pci.h> +#include <linux/delay.h> + +#include <sound/core.h> +#include <sound/initval.h> +#include <sound/pcm.h> +#include <sound/control.h> +#include "tw686x.h" +#include "tw686x-regs.h" + +#define AUDIO_CHANNEL_OFFSET 8 + +void tw686x_audio_irq(struct tw686x_dev *dev, unsigned long requests, + unsigned int pb_status) +{ + unsigned long flags; + unsigned int ch, pb; + + for_each_set_bit(ch, &requests, max_channels(dev)) { + struct tw686x_audio_channel *ac = &dev->audio_channels[ch]; + struct tw686x_audio_buf *done = NULL; + struct tw686x_audio_buf *next = NULL; + struct tw686x_dma_desc *desc; + + pb = !!(pb_status & BIT(AUDIO_CHANNEL_OFFSET + ch)); + + spin_lock_irqsave(&ac->lock, flags); + + /* Sanity check */ + if (!ac->ss || !ac->curr_bufs[0] || !ac->curr_bufs[1]) { + spin_unlock_irqrestore(&ac->lock, flags); + continue; + } + + if (!list_empty(&ac->buf_list)) { + next = list_first_entry(&ac->buf_list, + struct tw686x_audio_buf, list); + list_move_tail(&next->list, &ac->buf_list); + done = ac->curr_bufs[!pb]; + ac->curr_bufs[pb] = next; + } + spin_unlock_irqrestore(&ac->lock, flags); + + desc = &ac->dma_descs[pb]; + if (done && next && desc->virt) { + memcpy(done->virt, desc->virt, desc->size); + ac->ptr = done->dma - ac->buf[0].dma; + snd_pcm_period_elapsed(ac->ss); + } + } +} + +static int tw686x_pcm_hw_params(struct snd_pcm_substream *ss, + struct snd_pcm_hw_params *hw_params) +{ + return snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params)); +} + +static int tw686x_pcm_hw_free(struct snd_pcm_substream *ss) +{ + return snd_pcm_lib_free_pages(ss); +} + +/* + * The audio device rate is global and shared among all + * capture channels. The driver makes no effort to prevent + * rate modifications. User is free change the rate, but it + * means changing the rate for all capture sub-devices. + */ +static const struct snd_pcm_hardware tw686x_capture_hw = { + .info = (SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_INTERLEAVED | + SNDRV_PCM_INFO_BLOCK_TRANSFER | + SNDRV_PCM_INFO_MMAP_VALID), + .formats = SNDRV_PCM_FMTBIT_S16_LE, + .rates = SNDRV_PCM_RATE_8000_48000, + .rate_min = 8000, + .rate_max = 48000, + .channels_min = 1, + .channels_max = 1, + .buffer_bytes_max = TW686X_AUDIO_PAGE_MAX * TW686X_AUDIO_PAGE_SZ, + .period_bytes_min = TW686X_AUDIO_PAGE_SZ, + .period_bytes_max = TW686X_AUDIO_PAGE_SZ, + .periods_min = TW686X_AUDIO_PERIODS_MIN, + .periods_max = TW686X_AUDIO_PERIODS_MAX, +}; + +static int tw686x_pcm_open(struct snd_pcm_substream *ss) +{ + struct tw686x_dev *dev = snd_pcm_substream_chip(ss); + struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number]; + struct snd_pcm_runtime *rt = ss->runtime; + int err; + + ac->ss = ss; + rt->hw = tw686x_capture_hw; + + err = snd_pcm_hw_constraint_integer(rt, SNDRV_PCM_HW_PARAM_PERIODS); + if (err < 0) + return err; + + return 0; +} + +static int tw686x_pcm_close(struct snd_pcm_substream *ss) +{ + struct tw686x_dev *dev = snd_pcm_substream_chip(ss); + struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number]; + + ac->ss = NULL; + return 0; +} + +static int tw686x_pcm_prepare(struct snd_pcm_substream *ss) +{ + struct tw686x_dev *dev = snd_pcm_substream_chip(ss); + struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number]; + struct snd_pcm_runtime *rt = ss->runtime; + unsigned int period_size = snd_pcm_lib_period_bytes(ss); + struct tw686x_audio_buf *p_buf, *b_buf; + unsigned long flags; + int i; + + spin_lock_irqsave(&dev->lock, flags); + tw686x_disable_channel(dev, AUDIO_CHANNEL_OFFSET + ac->ch); + spin_unlock_irqrestore(&dev->lock, flags); + + if (dev->audio_rate != rt->rate) { + u32 reg; + + dev->audio_rate = rt->rate; + reg = ((125000000 / rt->rate) << 16) + + ((125000000 % rt->rate) << 16) / rt->rate; + + reg_write(dev, AUDIO_CONTROL2, reg); + } + + if (period_size != TW686X_AUDIO_PAGE_SZ || + rt->periods < TW686X_AUDIO_PERIODS_MIN || + rt->periods > TW686X_AUDIO_PERIODS_MAX) { + return -EINVAL; + } + + spin_lock_irqsave(&ac->lock, flags); + INIT_LIST_HEAD(&ac->buf_list); + + for (i = 0; i < rt->periods; i++) { + ac->buf[i].dma = rt->dma_addr + period_size * i; + ac->buf[i].virt = rt->dma_area + period_size * i; + INIT_LIST_HEAD(&ac->buf[i].list); + list_add_tail(&ac->buf[i].list, &ac->buf_list); + } + + p_buf = list_first_entry(&ac->buf_list, struct tw686x_audio_buf, list); + list_move_tail(&p_buf->list, &ac->buf_list); + + b_buf = list_first_entry(&ac->buf_list, struct tw686x_audio_buf, list); + list_move_tail(&b_buf->list, &ac->buf_list); + + ac->curr_bufs[0] = p_buf; + ac->curr_bufs[1] = b_buf; + ac->ptr = 0; + spin_unlock_irqrestore(&ac->lock, flags); + + return 0; +} + +static int tw686x_pcm_trigger(struct snd_pcm_substream *ss, int cmd) +{ + struct tw686x_dev *dev = snd_pcm_substream_chip(ss); + struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number]; + unsigned long flags; + int err = 0; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + if (ac->curr_bufs[0] && ac->curr_bufs[1]) { + spin_lock_irqsave(&dev->lock, flags); + tw686x_enable_channel(dev, + AUDIO_CHANNEL_OFFSET + ac->ch); + spin_unlock_irqrestore(&dev->lock, flags); + + mod_timer(&dev->dma_delay_timer, + jiffies + msecs_to_jiffies(100)); + } else { + err = -EIO; + } + break; + case SNDRV_PCM_TRIGGER_STOP: + spin_lock_irqsave(&dev->lock, flags); + tw686x_disable_channel(dev, AUDIO_CHANNEL_OFFSET + ac->ch); + spin_unlock_irqrestore(&dev->lock, flags); + + spin_lock_irqsave(&ac->lock, flags); + ac->curr_bufs[0] = NULL; + ac->curr_bufs[1] = NULL; + spin_unlock_irqrestore(&ac->lock, flags); + break; + default: + err = -EINVAL; + } + return err; +} + +static snd_pcm_uframes_t tw686x_pcm_pointer(struct snd_pcm_substream *ss) +{ + struct tw686x_dev *dev = snd_pcm_substream_chip(ss); + struct tw686x_audio_channel *ac = &dev->audio_channels[ss->number]; + + return bytes_to_frames(ss->runtime, ac->ptr); +} + +static struct snd_pcm_ops tw686x_pcm_ops = { + .open = tw686x_pcm_open, + .close = tw686x_pcm_close, + .ioctl = snd_pcm_lib_ioctl, + .hw_params = tw686x_pcm_hw_params, + .hw_free = tw686x_pcm_hw_free, + .prepare = tw686x_pcm_prepare, + .trigger = tw686x_pcm_trigger, + .pointer = tw686x_pcm_pointer, +}; + +static int tw686x_snd_pcm_init(struct tw686x_dev *dev) +{ + struct snd_card *card = dev->snd_card; + struct snd_pcm *pcm; + struct snd_pcm_substream *ss; + unsigned int i; + int err; + + err = snd_pcm_new(card, card->driver, 0, 0, max_channels(dev), &pcm); + if (err < 0) + return err; + + snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &tw686x_pcm_ops); + snd_pcm_chip(pcm) = dev; + pcm->info_flags = 0; + strlcpy(pcm->name, "tw686x PCM", sizeof(pcm->name)); + + for (i = 0, ss = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; + ss; ss = ss->next, i++) + snprintf(ss->name, sizeof(ss->name), "vch%u audio", i); + + return snd_pcm_lib_preallocate_pages_for_all(pcm, + SNDRV_DMA_TYPE_DEV, + snd_dma_pci_data(dev->pci_dev), + TW686X_AUDIO_PAGE_MAX * TW686X_AUDIO_PAGE_SZ, + TW686X_AUDIO_PAGE_MAX * TW686X_AUDIO_PAGE_SZ); +} + +static void tw686x_audio_dma_free(struct tw686x_dev *dev, + struct tw686x_audio_channel *ac) +{ + int pb; + + for (pb = 0; pb < 2; pb++) { + if (!ac->dma_descs[pb].virt) + continue; + pci_free_consistent(dev->pci_dev, ac->dma_descs[pb].size, + ac->dma_descs[pb].virt, + ac->dma_descs[pb].phys); + ac->dma_descs[pb].virt = NULL; + } +} + +static int tw686x_audio_dma_alloc(struct tw686x_dev *dev, + struct tw686x_audio_channel *ac) +{ + int pb; + + for (pb = 0; pb < 2; pb++) { + u32 reg = pb ? ADMA_B_ADDR[ac->ch] : ADMA_P_ADDR[ac->ch]; + void *virt; + + virt = pci_alloc_consistent(dev->pci_dev, TW686X_AUDIO_PAGE_SZ, + &ac->dma_descs[pb].phys); + if (!virt) { + dev_err(&dev->pci_dev->dev, + "dma%d: unable to allocate audio DMA %s-buffer\n", + ac->ch, pb ? "B" : "P"); + return -ENOMEM; + } + ac->dma_descs[pb].virt = virt; + ac->dma_descs[pb].size = TW686X_AUDIO_PAGE_SZ; + reg_write(dev, reg, ac->dma_descs[pb].phys); + } + return 0; +} + +void tw686x_audio_free(struct tw686x_dev *dev) +{ + unsigned long flags; + u32 dma_ch_mask; + u32 dma_cmd; + + spin_lock_irqsave(&dev->lock, flags); + dma_cmd = reg_read(dev, DMA_CMD); + dma_ch_mask = reg_read(dev, DMA_CHANNEL_ENABLE); + reg_write(dev, DMA_CMD, dma_cmd & ~0xff00); + reg_write(dev, DMA_CHANNEL_ENABLE, dma_ch_mask & ~0xff00); + spin_unlock_irqrestore(&dev->lock, flags); + + if (!dev->snd_card) + return; + snd_card_free(dev->snd_card); + dev->snd_card = NULL; +} + +int tw686x_audio_init(struct tw686x_dev *dev) +{ + struct pci_dev *pci_dev = dev->pci_dev; + struct snd_card *card; + int err, ch; + + /* + * AUDIO_CONTROL1 + * DMA byte length [31:19] = 4096 (i.e. ALSA period) + * External audio enable [0] = enabled + */ + reg_write(dev, AUDIO_CONTROL1, 0x80000001); + + err = snd_card_new(&pci_dev->dev, SNDRV_DEFAULT_IDX1, + SNDRV_DEFAULT_STR1, + THIS_MODULE, 0, &card); + if (err < 0) + return err; + + dev->snd_card = card; + strlcpy(card->driver, "tw686x", sizeof(card->driver)); + strlcpy(card->shortname, "tw686x", sizeof(card->shortname)); + strlcpy(card->longname, pci_name(pci_dev), sizeof(card->longname)); + snd_card_set_dev(card, &pci_dev->dev); + + for (ch = 0; ch < max_channels(dev); ch++) { + struct tw686x_audio_channel *ac; + + ac = &dev->audio_channels[ch]; + spin_lock_init(&ac->lock); + ac->dev = dev; + ac->ch = ch; + + err = tw686x_audio_dma_alloc(dev, ac); + if (err < 0) + goto err_cleanup; + } + + err = tw686x_snd_pcm_init(dev); + if (err < 0) + goto err_cleanup; + + err = snd_card_register(card); + if (!err) + return 0; + +err_cleanup: + for (ch = 0; ch < max_channels(dev); ch++) { + if (!dev->audio_channels[ch].dev) + continue; + tw686x_audio_dma_free(dev, &dev->audio_channels[ch]); + } + snd_card_free(card); + dev->snd_card = NULL; + return err; +} |