diff options
Diffstat (limited to 'drivers/media/video/cx23885/cx23885-alsa.c')
| -rw-r--r-- | drivers/media/video/cx23885/cx23885-alsa.c | 535 |
1 files changed, 535 insertions, 0 deletions
diff --git a/drivers/media/video/cx23885/cx23885-alsa.c b/drivers/media/video/cx23885/cx23885-alsa.c new file mode 100644 index 00000000..79516923 --- /dev/null +++ b/drivers/media/video/cx23885/cx23885-alsa.c @@ -0,0 +1,535 @@ +/* + * + * Support for CX23885 analog audio capture + * + * (c) 2008 Mijhail Moreyra <mijhail.moreyra@gmail.com> + * Adapted from cx88-alsa.c + * (c) 2009 Steven Toth <stoth@kernellabs.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/device.h> +#include <linux/interrupt.h> +#include <linux/vmalloc.h> +#include <linux/dma-mapping.h> +#include <linux/pci.h> + +#include <asm/delay.h> + +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/control.h> +#include <sound/initval.h> + +#include <sound/tlv.h> + + +#include "cx23885.h" +#include "cx23885-reg.h" + +#define AUDIO_SRAM_CHANNEL SRAM_CH07 + +#define dprintk(level, fmt, arg...) if (audio_debug >= level) \ + printk(KERN_INFO "%s: " fmt, chip->dev->name , ## arg) + +#define dprintk_core(level, fmt, arg...) if (audio_debug >= level) \ + printk(KERN_DEBUG "%s: " fmt, chip->dev->name , ## arg) + +/**************************************************************************** + Module global static vars + ****************************************************************************/ + +static unsigned int disable_analog_audio; +module_param(disable_analog_audio, int, 0644); +MODULE_PARM_DESC(disable_analog_audio, "disable analog audio ALSA driver"); + +static unsigned int audio_debug; +module_param(audio_debug, int, 0644); +MODULE_PARM_DESC(audio_debug, "enable debug messages [analog audio]"); + +/**************************************************************************** + Board specific funtions + ****************************************************************************/ + +/* Constants taken from cx88-reg.h */ +#define AUD_INT_DN_RISCI1 (1 << 0) +#define AUD_INT_UP_RISCI1 (1 << 1) +#define AUD_INT_RDS_DN_RISCI1 (1 << 2) +#define AUD_INT_DN_RISCI2 (1 << 4) /* yes, 3 is skipped */ +#define AUD_INT_UP_RISCI2 (1 << 5) +#define AUD_INT_RDS_DN_RISCI2 (1 << 6) +#define AUD_INT_DN_SYNC (1 << 12) +#define AUD_INT_UP_SYNC (1 << 13) +#define AUD_INT_RDS_DN_SYNC (1 << 14) +#define AUD_INT_OPC_ERR (1 << 16) +#define AUD_INT_BER_IRQ (1 << 20) +#define AUD_INT_MCHG_IRQ (1 << 21) +#define GP_COUNT_CONTROL_RESET 0x3 + +/* + * BOARD Specific: Sets audio DMA + */ + +static int cx23885_start_audio_dma(struct cx23885_audio_dev *chip) +{ + struct cx23885_audio_buffer *buf = chip->buf; + struct cx23885_dev *dev = chip->dev; + struct sram_channel *audio_ch = + &dev->sram_channels[AUDIO_SRAM_CHANNEL]; + + dprintk(1, "%s()\n", __func__); + + /* Make sure RISC/FIFO are off before changing FIFO/RISC settings */ + cx_clear(AUD_INT_DMA_CTL, 0x11); + + /* setup fifo + format - out channel */ + cx23885_sram_channel_setup(chip->dev, audio_ch, buf->bpl, + buf->risc.dma); + + /* sets bpl size */ + cx_write(AUD_INT_A_LNGTH, buf->bpl); + + /* This is required to get good audio (1 seems to be ok) */ + cx_write(AUD_INT_A_MODE, 1); + + /* reset counter */ + cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET); + atomic_set(&chip->count, 0); + + dprintk(1, "Start audio DMA, %d B/line, %d lines/FIFO, %d periods, %d " + "byte buffer\n", buf->bpl, cx_read(audio_ch->cmds_start+12)>>1, + chip->num_periods, buf->bpl * chip->num_periods); + + /* Enables corresponding bits at AUD_INT_STAT */ + cx_write(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC | + AUD_INT_DN_RISCI1); + + /* Clean any pending interrupt bits already set */ + cx_write(AUDIO_INT_INT_STAT, ~0); + + /* enable audio irqs */ + cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT); + + /* start dma */ + cx_set(DEV_CNTRL2, (1<<5)); /* Enables Risc Processor */ + cx_set(AUD_INT_DMA_CTL, 0x11); /* audio downstream FIFO and + RISC enable */ + if (audio_debug) + cx23885_sram_channel_dump(chip->dev, audio_ch); + + return 0; +} + +/* + * BOARD Specific: Resets audio DMA + */ +static int cx23885_stop_audio_dma(struct cx23885_audio_dev *chip) +{ + struct cx23885_dev *dev = chip->dev; + dprintk(1, "Stopping audio DMA\n"); + + /* stop dma */ + cx_clear(AUD_INT_DMA_CTL, 0x11); + + /* disable irqs */ + cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT); + cx_clear(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC | + AUD_INT_DN_RISCI1); + + if (audio_debug) + cx23885_sram_channel_dump(chip->dev, + &dev->sram_channels[AUDIO_SRAM_CHANNEL]); + + return 0; +} + +/* + * BOARD Specific: Handles audio IRQ + */ +int cx23885_audio_irq(struct cx23885_dev *dev, u32 status, u32 mask) +{ + struct cx23885_audio_dev *chip = dev->audio_dev; + + if (0 == (status & mask)) + return 0; + + cx_write(AUDIO_INT_INT_STAT, status); + + /* risc op code error */ + if (status & AUD_INT_OPC_ERR) { + printk(KERN_WARNING "%s/1: Audio risc op code error\n", + dev->name); + cx_clear(AUD_INT_DMA_CTL, 0x11); + cx23885_sram_channel_dump(dev, + &dev->sram_channels[AUDIO_SRAM_CHANNEL]); + } + if (status & AUD_INT_DN_SYNC) { + dprintk(1, "Downstream sync error\n"); + cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET); + return 1; + } + /* risc1 downstream */ + if (status & AUD_INT_DN_RISCI1) { + atomic_set(&chip->count, cx_read(AUD_INT_A_GPCNT)); + snd_pcm_period_elapsed(chip->substream); + } + /* FIXME: Any other status should deserve a special handling? */ + + return 1; +} + +static int dsp_buffer_free(struct cx23885_audio_dev *chip) +{ + BUG_ON(!chip->dma_size); + + dprintk(2, "Freeing buffer\n"); + videobuf_dma_unmap(&chip->pci->dev, chip->dma_risc); + videobuf_dma_free(chip->dma_risc); + btcx_riscmem_free(chip->pci, &chip->buf->risc); + kfree(chip->buf); + + chip->dma_risc = NULL; + chip->dma_size = 0; + + return 0; +} + +/**************************************************************************** + ALSA PCM Interface + ****************************************************************************/ + +/* + * Digital hardware definition + */ +#define DEFAULT_FIFO_SIZE 4096 + +static struct snd_pcm_hardware snd_cx23885_digital_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_48000, + .rate_min = 48000, + .rate_max = 48000, + .channels_min = 2, + .channels_max = 2, + /* Analog audio output will be full of clicks and pops if there + are not exactly four lines in the SRAM FIFO buffer. */ + .period_bytes_min = DEFAULT_FIFO_SIZE/4, + .period_bytes_max = DEFAULT_FIFO_SIZE/4, + .periods_min = 1, + .periods_max = 1024, + .buffer_bytes_max = (1024*1024), +}; + +/* + * audio pcm capture open callback + */ +static int snd_cx23885_pcm_open(struct snd_pcm_substream *substream) +{ + struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); + struct snd_pcm_runtime *runtime = substream->runtime; + int err; + + if (!chip) { + printk(KERN_ERR "BUG: cx23885 can't find device struct." + " Can't proceed with open\n"); + return -ENODEV; + } + + err = snd_pcm_hw_constraint_pow2(runtime, 0, + SNDRV_PCM_HW_PARAM_PERIODS); + if (err < 0) + goto _error; + + chip->substream = substream; + + runtime->hw = snd_cx23885_digital_hw; + + if (chip->dev->sram_channels[AUDIO_SRAM_CHANNEL].fifo_size != + DEFAULT_FIFO_SIZE) { + unsigned int bpl = chip->dev-> + sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 4; + bpl &= ~7; /* must be multiple of 8 */ + runtime->hw.period_bytes_min = bpl; + runtime->hw.period_bytes_max = bpl; + } + + return 0; +_error: + dprintk(1, "Error opening PCM!\n"); + return err; +} + +/* + * audio close callback + */ +static int snd_cx23885_close(struct snd_pcm_substream *substream) +{ + return 0; +} + +/* + * hw_params callback + */ +static int snd_cx23885_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *hw_params) +{ + struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); + struct videobuf_dmabuf *dma; + + struct cx23885_audio_buffer *buf; + int ret; + + if (substream->runtime->dma_area) { + dsp_buffer_free(chip); + substream->runtime->dma_area = NULL; + } + + chip->period_size = params_period_bytes(hw_params); + chip->num_periods = params_periods(hw_params); + chip->dma_size = chip->period_size * params_periods(hw_params); + + BUG_ON(!chip->dma_size); + BUG_ON(chip->num_periods & (chip->num_periods-1)); + + buf = kzalloc(sizeof(*buf), GFP_KERNEL); + if (NULL == buf) + return -ENOMEM; + + buf->bpl = chip->period_size; + + dma = &buf->dma; + videobuf_dma_init(dma); + ret = videobuf_dma_init_kernel(dma, PCI_DMA_FROMDEVICE, + (PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT)); + if (ret < 0) + goto error; + + ret = videobuf_dma_map(&chip->pci->dev, dma); + if (ret < 0) + goto error; + + ret = cx23885_risc_databuffer(chip->pci, &buf->risc, dma->sglist, + chip->period_size, chip->num_periods, 1); + if (ret < 0) + goto error; + + /* Loop back to start of program */ + buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP|RISC_IRQ1|RISC_CNT_INC); + buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma); + buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */ + + chip->buf = buf; + chip->dma_risc = dma; + + substream->runtime->dma_area = chip->dma_risc->vaddr; + substream->runtime->dma_bytes = chip->dma_size; + substream->runtime->dma_addr = 0; + + return 0; + +error: + kfree(buf); + return ret; +} + +/* + * hw free callback + */ +static int snd_cx23885_hw_free(struct snd_pcm_substream *substream) +{ + + struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); + + if (substream->runtime->dma_area) { + dsp_buffer_free(chip); + substream->runtime->dma_area = NULL; + } + + return 0; +} + +/* + * prepare callback + */ +static int snd_cx23885_prepare(struct snd_pcm_substream *substream) +{ + return 0; +} + +/* + * trigger callback + */ +static int snd_cx23885_card_trigger(struct snd_pcm_substream *substream, + int cmd) +{ + struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); + int err; + + /* Local interrupts are already disabled by ALSA */ + spin_lock(&chip->lock); + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + err = cx23885_start_audio_dma(chip); + break; + case SNDRV_PCM_TRIGGER_STOP: + err = cx23885_stop_audio_dma(chip); + break; + default: + err = -EINVAL; + break; + } + + spin_unlock(&chip->lock); + + return err; +} + +/* + * pointer callback + */ +static snd_pcm_uframes_t snd_cx23885_pointer( + struct snd_pcm_substream *substream) +{ + struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream); + struct snd_pcm_runtime *runtime = substream->runtime; + u16 count; + + count = atomic_read(&chip->count); + + return runtime->period_size * (count & (runtime->periods-1)); +} + +/* + * page callback (needed for mmap) + */ +static struct page *snd_cx23885_page(struct snd_pcm_substream *substream, + unsigned long offset) +{ + void *pageptr = substream->runtime->dma_area + offset; + return vmalloc_to_page(pageptr); +} + +/* + * operators + */ +static struct snd_pcm_ops snd_cx23885_pcm_ops = { + .open = snd_cx23885_pcm_open, + .close = snd_cx23885_close, + .ioctl = snd_pcm_lib_ioctl, + .hw_params = snd_cx23885_hw_params, + .hw_free = snd_cx23885_hw_free, + .prepare = snd_cx23885_prepare, + .trigger = snd_cx23885_card_trigger, + .pointer = snd_cx23885_pointer, + .page = snd_cx23885_page, +}; + +/* + * create a PCM device + */ +static int snd_cx23885_pcm(struct cx23885_audio_dev *chip, int device, + char *name) +{ + int err; + struct snd_pcm *pcm; + + err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm); + if (err < 0) + return err; + pcm->private_data = chip; + strcpy(pcm->name, name); + snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx23885_pcm_ops); + + return 0; +} + +/**************************************************************************** + Basic Flow for Sound Devices + ****************************************************************************/ + +/* + * Alsa Constructor - Component probe + */ + +struct cx23885_audio_dev *cx23885_audio_register(struct cx23885_dev *dev) +{ + struct snd_card *card; + struct cx23885_audio_dev *chip; + int err; + + if (disable_analog_audio) + return NULL; + + if (dev->sram_channels[AUDIO_SRAM_CHANNEL].cmds_start == 0) { + printk(KERN_WARNING "%s(): Missing SRAM channel configuration " + "for analog TV Audio\n", __func__); + return NULL; + } + + err = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1, + THIS_MODULE, sizeof(struct cx23885_audio_dev), &card); + if (err < 0) + goto error; + + chip = (struct cx23885_audio_dev *) card->private_data; + chip->dev = dev; + chip->pci = dev->pci; + chip->card = card; + spin_lock_init(&chip->lock); + + snd_card_set_dev(card, &dev->pci->dev); + + err = snd_cx23885_pcm(chip, 0, "CX23885 Digital"); + if (err < 0) + goto error; + + strcpy(card->driver, "CX23885"); + sprintf(card->shortname, "Conexant CX23885"); + sprintf(card->longname, "%s at %s", card->shortname, dev->name); + + err = snd_card_register(card); + if (err < 0) + goto error; + + dprintk(0, "registered ALSA audio device\n"); + + return chip; + +error: + snd_card_free(card); + printk(KERN_ERR "%s(): Failed to register analog " + "audio adapter\n", __func__); + + return NULL; +} + +/* + * ALSA destructor + */ +void cx23885_audio_unregister(struct cx23885_dev *dev) +{ + struct cx23885_audio_dev *chip = dev->audio_dev; + + snd_card_free(chip->card); +} |