diff options
Diffstat (limited to 'drivers/media/pci/cx25821/cx25821-alsa.c')
| -rw-r--r-- | drivers/media/pci/cx25821/cx25821-alsa.c | 819 |
1 files changed, 819 insertions, 0 deletions
diff --git a/drivers/media/pci/cx25821/cx25821-alsa.c b/drivers/media/pci/cx25821/cx25821-alsa.c new file mode 100644 index 000000000..a42f0c03a --- /dev/null +++ b/drivers/media/pci/cx25821/cx25821-alsa.c @@ -0,0 +1,819 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Driver for the Conexant CX25821 PCIe bridge + * + * Copyright (C) 2009 Conexant Systems Inc. + * Authors <shu.lin@conexant.com>, <hiep.huynh@conexant.com> + * Based on SAA713x ALSA driver and CX88 driver + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#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 <linux/slab.h> + +#include <linux/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 "cx25821.h" +#include "cx25821-reg.h" + +#define AUDIO_SRAM_CHANNEL SRAM_CH08 + +#define dprintk(level, fmt, arg...) \ +do { \ + if (debug >= level) \ + pr_info("%s/1: " fmt, chip->dev->name, ##arg); \ +} while (0) +#define dprintk_core(level, fmt, arg...) \ +do { \ + if (debug >= level) \ + printk(KERN_DEBUG "%s/1: " fmt, chip->dev->name, ##arg); \ +} while (0) + +/**************************************************************************** + Data type declarations - Can be moded to a header file later + ****************************************************************************/ + +static int devno; + +struct cx25821_audio_buffer { + unsigned int bpl; + struct cx25821_riscmem risc; + void *vaddr; + struct scatterlist *sglist; + int sglen; + unsigned long nr_pages; +}; + +struct cx25821_audio_dev { + struct cx25821_dev *dev; + struct cx25821_dmaqueue q; + + /* pci i/o */ + struct pci_dev *pci; + + /* audio controls */ + int irq; + + struct snd_card *card; + + unsigned long iobase; + spinlock_t reg_lock; + atomic_t count; + + unsigned int dma_size; + unsigned int period_size; + unsigned int num_periods; + + struct cx25821_audio_buffer *buf; + + struct snd_pcm_substream *substream; +}; + + +/**************************************************************************** + Module global static vars + ****************************************************************************/ + +static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ +static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ +static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP; + +module_param_array(enable, bool, NULL, 0444); +MODULE_PARM_DESC(enable, "Enable cx25821 soundcard. default enabled."); + +module_param_array(index, int, NULL, 0444); +MODULE_PARM_DESC(index, "Index value for cx25821 capture interface(s)."); + +/**************************************************************************** + Module macros + ****************************************************************************/ + +MODULE_DESCRIPTION("ALSA driver module for cx25821 based capture cards"); +MODULE_AUTHOR("Hiep Huynh"); +MODULE_LICENSE("GPL"); + +static unsigned int debug; +module_param(debug, int, 0644); +MODULE_PARM_DESC(debug, "enable debug messages"); + +/**************************************************************************** + Module specific functions + ****************************************************************************/ +/* 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 + +#define PCI_MSK_AUD_EXT (1 << 4) +#define PCI_MSK_AUD_INT (1 << 3) + +static int cx25821_alsa_dma_init(struct cx25821_audio_dev *chip, + unsigned long nr_pages) +{ + struct cx25821_audio_buffer *buf = chip->buf; + struct page *pg; + int i; + + buf->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT); + if (NULL == buf->vaddr) { + dprintk(1, "vmalloc_32(%lu pages) failed\n", nr_pages); + return -ENOMEM; + } + + dprintk(1, "vmalloc is at addr 0x%p, size=%lu\n", + buf->vaddr, + nr_pages << PAGE_SHIFT); + + memset(buf->vaddr, 0, nr_pages << PAGE_SHIFT); + buf->nr_pages = nr_pages; + + buf->sglist = vzalloc(array_size(sizeof(*buf->sglist), buf->nr_pages)); + if (NULL == buf->sglist) + goto vzalloc_err; + + sg_init_table(buf->sglist, buf->nr_pages); + for (i = 0; i < buf->nr_pages; i++) { + pg = vmalloc_to_page(buf->vaddr + i * PAGE_SIZE); + if (NULL == pg) + goto vmalloc_to_page_err; + sg_set_page(&buf->sglist[i], pg, PAGE_SIZE, 0); + } + return 0; + +vmalloc_to_page_err: + vfree(buf->sglist); + buf->sglist = NULL; +vzalloc_err: + vfree(buf->vaddr); + buf->vaddr = NULL; + return -ENOMEM; +} + +static int cx25821_alsa_dma_map(struct cx25821_audio_dev *dev) +{ + struct cx25821_audio_buffer *buf = dev->buf; + + buf->sglen = dma_map_sg(&dev->pci->dev, buf->sglist, + buf->nr_pages, DMA_FROM_DEVICE); + + if (0 == buf->sglen) { + pr_warn("%s: cx25821_alsa_map_sg failed\n", __func__); + return -ENOMEM; + } + return 0; +} + +static int cx25821_alsa_dma_unmap(struct cx25821_audio_dev *dev) +{ + struct cx25821_audio_buffer *buf = dev->buf; + + if (!buf->sglen) + return 0; + + dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->nr_pages, DMA_FROM_DEVICE); + buf->sglen = 0; + return 0; +} + +static int cx25821_alsa_dma_free(struct cx25821_audio_buffer *buf) +{ + vfree(buf->sglist); + buf->sglist = NULL; + vfree(buf->vaddr); + buf->vaddr = NULL; + return 0; +} + +/* + * BOARD Specific: Sets audio DMA + */ + +static int _cx25821_start_audio_dma(struct cx25821_audio_dev *chip) +{ + struct cx25821_audio_buffer *buf = chip->buf; + struct cx25821_dev *dev = chip->dev; + const struct sram_channel *audio_ch = + &cx25821_sram_channels[AUDIO_SRAM_CHANNEL]; + u32 tmp = 0; + + /* enable output on the GPIO 0 for the MCLK ADC (Audio) */ + cx25821_set_gpiopin_direction(chip->dev, 0, 0); + + /* Make sure RISC/FIFO are off before changing FIFO/RISC settings */ + cx_clear(AUD_INT_DMA_CTL, + FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN); + + /* setup fifo + format - out channel */ + cx25821_sram_channel_setup_audio(chip->dev, audio_ch, buf->bpl, + buf->risc.dma); + + /* sets bpl size */ + cx_write(AUD_A_LNGTH, buf->bpl); + + /* reset counter */ + /* GP_COUNT_CONTROL_RESET = 0x3 */ + cx_write(AUD_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET); + atomic_set(&chip->count, 0); + + /* Set the input mode to 16-bit */ + tmp = cx_read(AUD_A_CFG); + cx_write(AUD_A_CFG, tmp | FLD_AUD_DST_PK_MODE | FLD_AUD_DST_ENABLE | + FLD_AUD_CLK_ENABLE); + + /* + pr_info("DEBUG: Start audio DMA, %d B/line, cmds_start(0x%x)= %d lines/FIFO, %d periods, %d byte buffer\n", + buf->bpl, audio_ch->cmds_start, + 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(AUD_A_INT_MSK, FLD_AUD_DST_RISCI1 | FLD_AUD_DST_OF | + FLD_AUD_DST_SYNC | FLD_AUD_DST_OPC_ERR); + + /* Clean any pending interrupt bits already set */ + cx_write(AUD_A_INT_STAT, ~0); + + /* enable audio irqs */ + cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT); + + /* Turn on audio downstream fifo and risc enable 0x101 */ + tmp = cx_read(AUD_INT_DMA_CTL); + cx_set(AUD_INT_DMA_CTL, tmp | + (FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN)); + + mdelay(100); + return 0; +} + +/* + * BOARD Specific: Resets audio DMA + */ +static int _cx25821_stop_audio_dma(struct cx25821_audio_dev *chip) +{ + struct cx25821_dev *dev = chip->dev; + + /* stop dma */ + cx_clear(AUD_INT_DMA_CTL, + FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN); + + /* disable irqs */ + cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT); + cx_clear(AUD_A_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC | + AUD_INT_DN_RISCI2 | AUD_INT_DN_RISCI1); + + return 0; +} + +#define MAX_IRQ_LOOP 50 + +/* + * BOARD Specific: IRQ dma bits + */ +static char *cx25821_aud_irqs[32] = { + "dn_risci1", "up_risci1", "rds_dn_risc1", /* 0-2 */ + NULL, /* reserved */ + "dn_risci2", "up_risci2", "rds_dn_risc2", /* 4-6 */ + NULL, /* reserved */ + "dnf_of", "upf_uf", "rds_dnf_uf", /* 8-10 */ + NULL, /* reserved */ + "dn_sync", "up_sync", "rds_dn_sync", /* 12-14 */ + NULL, /* reserved */ + "opc_err", "par_err", "rip_err", /* 16-18 */ + "pci_abort", "ber_irq", "mchg_irq" /* 19-21 */ +}; + +/* + * BOARD Specific: Threats IRQ audio specific calls + */ +static void cx25821_aud_irq(struct cx25821_audio_dev *chip, u32 status, + u32 mask) +{ + struct cx25821_dev *dev = chip->dev; + + if (0 == (status & mask)) + return; + + cx_write(AUD_A_INT_STAT, status); + if (debug > 1 || (status & mask & ~0xff)) + cx25821_print_irqbits(dev->name, "irq aud", cx25821_aud_irqs, + ARRAY_SIZE(cx25821_aud_irqs), status, mask); + + /* risc op code error */ + if (status & AUD_INT_OPC_ERR) { + pr_warn("WARNING %s/1: Audio risc op code error\n", dev->name); + + cx_clear(AUD_INT_DMA_CTL, + FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN); + cx25821_sram_channel_dump_audio(dev, + &cx25821_sram_channels[AUDIO_SRAM_CHANNEL]); + } + if (status & AUD_INT_DN_SYNC) { + pr_warn("WARNING %s: Downstream sync error!\n", dev->name); + cx_write(AUD_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET); + return; + } + + /* risc1 downstream */ + if (status & AUD_INT_DN_RISCI1) { + atomic_set(&chip->count, cx_read(AUD_A_GPCNT)); + snd_pcm_period_elapsed(chip->substream); + } +} + +/* + * BOARD Specific: Handles IRQ calls + */ +static irqreturn_t cx25821_irq(int irq, void *dev_id) +{ + struct cx25821_audio_dev *chip = dev_id; + struct cx25821_dev *dev = chip->dev; + u32 status, pci_status; + u32 audint_status, audint_mask; + int loop, handled = 0; + + audint_status = cx_read(AUD_A_INT_STAT); + audint_mask = cx_read(AUD_A_INT_MSK); + status = cx_read(PCI_INT_STAT); + + for (loop = 0; loop < 1; loop++) { + status = cx_read(PCI_INT_STAT); + if (0 == status) { + status = cx_read(PCI_INT_STAT); + audint_status = cx_read(AUD_A_INT_STAT); + audint_mask = cx_read(AUD_A_INT_MSK); + + if (status) { + handled = 1; + cx_write(PCI_INT_STAT, status); + + cx25821_aud_irq(chip, audint_status, + audint_mask); + break; + } else { + goto out; + } + } + + handled = 1; + cx_write(PCI_INT_STAT, status); + + cx25821_aud_irq(chip, audint_status, audint_mask); + } + + pci_status = cx_read(PCI_INT_STAT); + + if (handled) + cx_write(PCI_INT_STAT, pci_status); + +out: + return IRQ_RETVAL(handled); +} + +static int dsp_buffer_free(struct cx25821_audio_dev *chip) +{ + struct cx25821_riscmem *risc = &chip->buf->risc; + + BUG_ON(!chip->dma_size); + + dprintk(2, "Freeing buffer\n"); + cx25821_alsa_dma_unmap(chip); + cx25821_alsa_dma_free(chip->buf); + dma_free_coherent(&chip->pci->dev, risc->size, risc->cpu, risc->dma); + kfree(chip->buf); + + chip->buf = NULL; + chip->dma_size = 0; + + return 0; +} + +/**************************************************************************** + ALSA PCM Interface + ****************************************************************************/ + +/* + * Digital hardware definition + */ +#define DEFAULT_FIFO_SIZE 384 +static const struct snd_pcm_hardware snd_cx25821_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 / 3, + .period_bytes_max = DEFAULT_FIFO_SIZE / 3, + .periods_min = 1, + .periods_max = AUDIO_LINE_SIZE, + /* 128 * 128 = 16384 = 1024 * 16 */ + .buffer_bytes_max = (AUDIO_LINE_SIZE * AUDIO_LINE_SIZE), +}; + +/* + * audio pcm capture open callback + */ +static int snd_cx25821_pcm_open(struct snd_pcm_substream *substream) +{ + struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream); + struct snd_pcm_runtime *runtime = substream->runtime; + int err; + unsigned int bpl = 0; + + if (!chip) { + pr_err("DEBUG: cx25821 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_cx25821_digital_hw; + + if (cx25821_sram_channels[AUDIO_SRAM_CHANNEL].fifo_size != + DEFAULT_FIFO_SIZE) { + /* since there are 3 audio Clusters */ + bpl = cx25821_sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 3; + bpl &= ~7; /* must be multiple of 8 */ + + if (bpl > AUDIO_LINE_SIZE) + bpl = AUDIO_LINE_SIZE; + + 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_cx25821_close(struct snd_pcm_substream *substream) +{ + return 0; +} + +/* + * hw_params callback + */ +static int snd_cx25821_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *hw_params) +{ + struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream); + struct cx25821_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; + + if (chip->period_size > AUDIO_LINE_SIZE) + chip->period_size = AUDIO_LINE_SIZE; + + buf->bpl = chip->period_size; + chip->buf = buf; + + ret = cx25821_alsa_dma_init(chip, + (PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT)); + if (ret < 0) + goto error; + + ret = cx25821_alsa_dma_map(chip); + if (ret < 0) + goto error; + + ret = cx25821_risc_databuffer_audio(chip->pci, &buf->risc, buf->sglist, + chip->period_size, chip->num_periods, 1); + if (ret < 0) { + pr_info("DEBUG: ERROR after cx25821_risc_databuffer_audio()\n"); + 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 */ + + substream->runtime->dma_area = chip->buf->vaddr; + substream->runtime->dma_bytes = chip->dma_size; + substream->runtime->dma_addr = 0; + + return 0; + +error: + chip->buf = NULL; + kfree(buf); + return ret; +} + +/* + * hw free callback + */ +static int snd_cx25821_hw_free(struct snd_pcm_substream *substream) +{ + struct cx25821_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_cx25821_prepare(struct snd_pcm_substream *substream) +{ + return 0; +} + +/* + * trigger callback + */ +static int snd_cx25821_card_trigger(struct snd_pcm_substream *substream, + int cmd) +{ + struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream); + int err = 0; + + /* Local interrupts are already disabled by ALSA */ + spin_lock(&chip->reg_lock); + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + err = _cx25821_start_audio_dma(chip); + break; + case SNDRV_PCM_TRIGGER_STOP: + err = _cx25821_stop_audio_dma(chip); + break; + default: + err = -EINVAL; + break; + } + + spin_unlock(&chip->reg_lock); + + return err; +} + +/* + * pointer callback + */ +static snd_pcm_uframes_t snd_cx25821_pointer(struct snd_pcm_substream + *substream) +{ + struct cx25821_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_cx25821_page(struct snd_pcm_substream *substream, + unsigned long offset) +{ + void *pageptr = substream->runtime->dma_area + offset; + + return vmalloc_to_page(pageptr); +} + +/* + * operators + */ +static const struct snd_pcm_ops snd_cx25821_pcm_ops = { + .open = snd_cx25821_pcm_open, + .close = snd_cx25821_close, + .hw_params = snd_cx25821_hw_params, + .hw_free = snd_cx25821_hw_free, + .prepare = snd_cx25821_prepare, + .trigger = snd_cx25821_card_trigger, + .pointer = snd_cx25821_pointer, + .page = snd_cx25821_page, +}; + +/* + * ALSA create a PCM device: Called when initializing the board. + * Sets up the name and hooks up the callbacks + */ +static int snd_cx25821_pcm(struct cx25821_audio_dev *chip, int device, + char *name) +{ + struct snd_pcm *pcm; + int err; + + err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm); + if (err < 0) { + pr_info("ERROR: FAILED snd_pcm_new() in %s\n", __func__); + return err; + } + pcm->private_data = chip; + pcm->info_flags = 0; + strscpy(pcm->name, name, sizeof(pcm->name)); + snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx25821_pcm_ops); + + return 0; +} + +/**************************************************************************** + Basic Flow for Sound Devices + ****************************************************************************/ + +/* + * PCI ID Table - 14f1:8801 and 14f1:8811 means function 1: Audio + * Only boards with eeprom and byte 1 at eeprom=1 have it + */ + +static const struct pci_device_id __maybe_unused cx25821_audio_pci_tbl[] = { + {0x14f1, 0x0920, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, + {0,} +}; + +MODULE_DEVICE_TABLE(pci, cx25821_audio_pci_tbl); + +/* + * Alsa Constructor - Component probe + */ +static int cx25821_audio_initdev(struct cx25821_dev *dev) +{ + struct snd_card *card; + struct cx25821_audio_dev *chip; + int err; + + if (devno >= SNDRV_CARDS) { + pr_info("DEBUG ERROR: devno >= SNDRV_CARDS %s\n", __func__); + return -ENODEV; + } + + if (!enable[devno]) { + ++devno; + pr_info("DEBUG ERROR: !enable[devno] %s\n", __func__); + return -ENOENT; + } + + err = snd_card_new(&dev->pci->dev, index[devno], id[devno], + THIS_MODULE, + sizeof(struct cx25821_audio_dev), &card); + if (err < 0) { + pr_info("DEBUG ERROR: cannot create snd_card_new in %s\n", + __func__); + return err; + } + + strscpy(card->driver, "cx25821", sizeof(card->driver)); + + /* Card "creation" */ + chip = card->private_data; + spin_lock_init(&chip->reg_lock); + + chip->dev = dev; + chip->card = card; + chip->pci = dev->pci; + chip->iobase = pci_resource_start(dev->pci, 0); + + chip->irq = dev->pci->irq; + + err = devm_request_irq(&dev->pci->dev, dev->pci->irq, cx25821_irq, + IRQF_SHARED, chip->dev->name, chip); + + if (err < 0) { + pr_err("ERROR %s: can't get IRQ %d for ALSA\n", chip->dev->name, + dev->pci->irq); + goto error; + } + + err = snd_cx25821_pcm(chip, 0, "cx25821 Digital"); + if (err < 0) { + pr_info("DEBUG ERROR: cannot create snd_cx25821_pcm %s\n", + __func__); + goto error; + } + + strscpy(card->shortname, "cx25821", sizeof(card->shortname)); + sprintf(card->longname, "%s at 0x%lx irq %d", chip->dev->name, + chip->iobase, chip->irq); + strscpy(card->mixername, "CX25821", sizeof(card->mixername)); + + pr_info("%s/%i: ALSA support for cx25821 boards\n", card->driver, + devno); + + err = snd_card_register(card); + if (err < 0) { + pr_info("DEBUG ERROR: cannot register sound card %s\n", + __func__); + goto error; + } + + dev->card = card; + devno++; + return 0; + +error: + snd_card_free(card); + return err; +} + +/**************************************************************************** + LINUX MODULE INIT + ****************************************************************************/ + +static int cx25821_alsa_exit_callback(struct device *dev, void *data) +{ + struct v4l2_device *v4l2_dev = dev_get_drvdata(dev); + struct cx25821_dev *cxdev = get_cx25821(v4l2_dev); + + snd_card_free(cxdev->card); + return 0; +} + +static void cx25821_audio_fini(void) +{ + struct device_driver *drv = driver_find("cx25821", &pci_bus_type); + int ret; + + ret = driver_for_each_device(drv, NULL, NULL, cx25821_alsa_exit_callback); + if (ret) + pr_err("%s failed to find a cx25821 driver.\n", __func__); +} + +static int cx25821_alsa_init_callback(struct device *dev, void *data) +{ + struct v4l2_device *v4l2_dev = dev_get_drvdata(dev); + struct cx25821_dev *cxdev = get_cx25821(v4l2_dev); + + cx25821_audio_initdev(cxdev); + return 0; +} + +/* + * Module initializer + * + * Loops through present saa7134 cards, and assigns an ALSA device + * to each one + * + */ +static int cx25821_alsa_init(void) +{ + struct device_driver *drv = driver_find("cx25821", &pci_bus_type); + + return driver_for_each_device(drv, NULL, NULL, cx25821_alsa_init_callback); + +} + +late_initcall(cx25821_alsa_init); +module_exit(cx25821_audio_fini); 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