*
*
* Caveats:
- * I still haven't got the mixer settings right.
- *
* - Volume doesn't work (it's always at max)
- * - There's no "memory" of the capture channel. It can be changed,
- * but alsamixer doesn't show it after a module restart (rmmod/insmod)
- *
- * Hotswapping DOES NOT work yet! Please remove the module before
- * inserting cardbus cards. pcmcia-cs or pccardd should load it
- * properly after insertion, and things will work
*
* 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
module_param(alsa_debug, int, 0644);
MODULE_PARM_DESC(alsa_debug,"enable debug messages [alsa]");
+/*
+ * Configuration macros
+ */
+
#define MAX_PCM_DEVICES 1
#define MAX_PCM_SUBSTREAMS 1
#define USE_PERIODS_MAX 1024
#endif
-
-#define dprintk(fmt, arg...) if (alsa_debug) \
- printk(KERN_DEBUG "%s/alsa: " fmt, dev->name , ## arg)
-
+#define MIXER_ADDR_TVTUNER 0
+#define MIXER_ADDR_LINE1 1
+#define MIXER_ADDR_LINE2 2
+#define MIXER_ADDR_LAST 2
static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
-#define MIXER_ADDR_TVTUNER 0
-#define MIXER_ADDR_LINE1 1
-#define MIXER_ADDR_LINE2 2
-#define MIXER_ADDR_LAST 2
+#define dprintk(fmt, arg...) if (alsa_debug) \
+ printk(KERN_DEBUG "%s/alsa: " fmt, dev->name , ## arg)
+/*
+ * Main chip structure
+ */
typedef struct snd_card_saa7134 {
snd_card_t *card;
spinlock_t mixer_lock;
spinlock_t lock;
} snd_card_saa7134_t;
+/*
+ * PCM structure
+ */
+
typedef struct snd_card_saa7134_pcm {
struct saa7134_dev *saadev;
static snd_card_t *snd_saa7134_cards[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;
+/*
+ * saa7134 DMA audio stop
+ *
+ * Called when the capture device is released or the buffer overflows
+ *
+ * - Copied verbatim from saa7134-oss's dsp_dma_stop. Can be dropped
+ * if we just share dsp_dma_stop and use it here
+ *
+ */
+
static void saa7134_dma_stop(struct saa7134_dev *dev)
+
{
dev->oss.dma_blk = -1;
dev->oss.dma_running = 0;
saa7134_set_dmabits(dev);
}
+/*
+ * saa7134 DMA audio start
+ *
+ * Called when preparing the capture device for use
+ *
+ * - Copied verbatim from saa7134-oss's dsp_dma_start. Can be dropped
+ * if we just share dsp_dma_start and use it here
+ *
+ */
+
static void saa7134_dma_start(struct saa7134_dev *dev)
{
dev->oss.dma_blk = 0;
saa7134_set_dmabits(dev);
}
+/*
+ * saa7134 audio DMA IRQ handler
+ *
+ * Called whenever we get an SAA7134_IRQ_REPORT_DONE_RA3 interrupt
+ * Handles shifting between the 2 buffers, manages the read counters,
+ * and notifies ALSA when periods elapse
+ *
+ * - Mostly copied from saa7134-oss's saa7134_irq_oss_done.
+ *
+ */
+
void saa7134_irq_alsa_done(struct saa7134_dev *dev, unsigned long status)
{
int next_blk, reg = 0;
}
+/*
+ * ALSA capture trigger
+ *
+ * - One of the ALSA capture callbacks.
+ *
+ * Called whenever a capture is started or stopped. Must be defined,
+ * but there's nothing we want to do here
+ *
+ */
static int snd_card_saa7134_capture_trigger(snd_pcm_substream_t * substream,
int cmd)
return 0;
}
+/*
+ * DMA buffer config
+ *
+ * Sets the values that will later be used as the size of the buffer,
+ * size of the fragments, and total number of fragments.
+ * Must be called during the preparation stage, before memory is
+ * allocated
+ *
+ * - Copied verbatim from saa7134-oss. Can be dropped
+ * if we just share dsp_buffer_conf from OSS.
+ */
+
static int dsp_buffer_conf(struct saa7134_dev *dev, int blksize, int blocks)
{
if (blksize < 0x100)
return 0;
}
+/*
+ * DMA buffer initialization
+ *
+ * Uses V4L functions to initialize the DMA. Shouldn't be necessary in
+ * ALSA, but I was unable to use ALSA's own DMA, and had to force the
+ * usage of V4L's
+ *
+ * - Copied verbatim from saa7134-oss. Can be dropped
+ * if we just share dsp_buffer_init from OSS.
+ */
+
static int dsp_buffer_init(struct saa7134_dev *dev)
{
int err;
return 0;
}
+/*
+ * ALSA PCM preparation
+ *
+ * - One of the ALSA capture callbacks.
+ *
+ * Called right after the capture device is opened, this function configures
+ * the buffer using the previously defined functions, allocates the memory,
+ * sets up the hardware registers, and then starts the DMA. When this function
+ * returns, the audio should be flowing.
+ *
+ */
-static int snd_card_saa7134_pcm_prepare(snd_pcm_substream_t * substream)
+static int snd_card_saa7134_capture_prepare(snd_pcm_substream_t * substream)
{
snd_pcm_runtime_t *runtime = substream->runtime;
int err, bswap, sign;
fmt |= (2 << 4);
if (!sign)
fmt |= 0x04;
- //saa_writel(SAA7133_NUM_SAMPLES, dev->oss.blksize -1);
saa_writel(SAA7133_NUM_SAMPLES, dev->oss.blksize -1);
saa_writel(SAA7133_AUDIO_CHANNEL, 0x543210 | (fmt << 24));
//saa_writel(SAA7133_AUDIO_CHANNEL, 0x543210);
if (bswap)
control |= SAA7134_RS_CONTROL_BSWAP;
+ /* I should be able to use runtime->dma_addr in the control
+ byte, but it doesn't work. So I allocate the DMA using the
+ V4L functions, and force ALSA to use that as the DMA area */
+
runtime->dma_area = dev->oss.dma.vmalloc;
+
saa_writel(SAA7134_RS_BA1(6),0);
saa_writel(SAA7134_RS_BA2(6),dev->oss.blksize);
saa_writel(SAA7134_RS_PITCH(6),0);
}
-static int snd_card_saa7134_capture_prepare(snd_pcm_substream_t * substream)
-{
- return snd_card_saa7134_pcm_prepare(substream);
-}
+/*
+ * ALSA pointer fetching
+ *
+ * - One of the ALSA capture callbacks.
+ *
+ * Called whenever a period elapses, it must return the current hardware
+ * position of the buffer.
+ * Also resets the read counter used to prevent overruns
+ *
+ */
-static snd_pcm_uframes_t snd_card_saa7134_pointer(snd_pcm_substream_t * substream)
+static snd_pcm_uframes_t snd_card_saa7134_capture_pointer(snd_pcm_substream_t * substream)
{
snd_pcm_runtime_t *runtime = substream->runtime;
snd_card_saa7134_pcm_t *saapcm = runtime->private_data;
dev->oss.read_offset = 0;
}
- //return bytes_to_frames(runtime, saa_readl(dev->oss.recording_on));
return bytes_to_frames(runtime, dev->oss.read_offset);
}
-
-static snd_pcm_uframes_t snd_card_saa7134_capture_pointer(snd_pcm_substream_t * substream)
-{
- return snd_card_saa7134_pointer(substream);
-}
+/*
+ * ALSA hardware capabilities definition
+ */
static snd_pcm_hardware_t snd_card_saa7134_capture =
{
}
+/*
+ * ALSA hardware params
+ *
+ * - One of the ALSA capture callbacks.
+ *
+ * Called on initialization, right before the PCM preparation
+ * Usually used in ALSA to allocate the DMA, but since we don't use the
+ * ALSA DMA I'm almost sure this isn't necessary.
+ *
+ */
+
static int snd_card_saa7134_hw_params(snd_pcm_substream_t * substream,
snd_pcm_hw_params_t * hw_params)
{
}
+/*
+ * ALSA hardware release
+ *
+ * - One of the ALSA capture callbacks.
+ *
+ * Called after closing the device, but before snd_card_saa7134_capture_close
+ * Usually used in ALSA to free the DMA, but since we don't use the
+ * ALSA DMA I'm almost sure this isn't necessary.
+ *
+ */
+
static int snd_card_saa7134_hw_free(snd_pcm_substream_t * substream)
{
return snd_pcm_lib_free_pages(substream);
}
+/*
+ * DMA buffer release
+ *
+ * Called after closing the device, during snd_card_saa7134_capture_close
+ *
+ */
+
static int dsp_buffer_free(struct saa7134_dev *dev)
{
if (!dev->oss.blksize)
return 0;
}
+/*
+ * ALSA capture finish
+ *
+ * - One of the ALSA capture callbacks.
+ *
+ * Called after closing the device. It stops the DMA audio and releases
+ * the buffers
+ *
+ */
-static int saa7134_cap_close(struct saa7134_dev *dev)
+static int snd_card_saa7134_capture_close(snd_pcm_substream_t * substream)
{
+ snd_card_saa7134_t *chip = snd_pcm_substream_chip(substream);
+ struct saa7134_dev *dev = chip->saadev;
unsigned long flags;
/* stop dma */
return 0;
}
+/*
+ * ALSA capture start
+ *
+ * - One of the ALSA capture callbacks.
+ *
+ * Called when opening the device. It creates and populates the PCM
+ * structure
+ *
+ */
-static int saa7134_cap_open(struct saa7134_dev *dev) {
+static int snd_card_saa7134_capture_open(snd_pcm_substream_t * substream)
+{
+ snd_pcm_runtime_t *runtime = substream->runtime;
+ snd_card_saa7134_pcm_t *saapcm;
+ snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
+ struct saa7134_dev *dev = saa7134->saadev;
+ int err;
down(&dev->oss.lock);
up(&dev->oss.lock);
- return 0;
-}
-
-static int snd_card_saa7134_capture_open(snd_pcm_substream_t * substream)
-{
- snd_pcm_runtime_t *runtime = substream->runtime;
- snd_card_saa7134_pcm_t *saapcm;
- snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
- int err;
-
- saa7134_cap_open(saa7134->saadev);
-
saapcm = kcalloc(1, sizeof(*saapcm), GFP_KERNEL);
if (saapcm == NULL)
return -ENOMEM;
return 0;
}
-static int snd_card_saa7134_capture_close(snd_pcm_substream_t * substream)
-{
- snd_card_saa7134_t *chip = snd_pcm_substream_chip(substream);
-
- saa7134_cap_close(chip->saadev);
- return 0;
-}
+/*
+ * ALSA capture callbacks definition
+ */
static snd_pcm_ops_t snd_card_saa7134_capture_ops = {
.open = snd_card_saa7134_capture_open,
.pointer = snd_card_saa7134_capture_pointer,
};
-static int __init snd_card_saa7134_pcm(snd_card_saa7134_t *saa7134, int device)
+/*
+ * ALSA PCM setup
+ *
+ * Called when initializing the board. Sets up the name and hooks up
+ * the callbacks
+ *
+ */
+
+static int snd_card_saa7134_pcm(snd_card_saa7134_t *saa7134, int device)
{
snd_pcm_t *pcm;
int err;
static int snd_saa7134_capsrc_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
- uinfo->count = 1;
+ uinfo->count = 2;
uinfo->value.integer.min = 0;
uinfo->value.integer.max = 1;
return 0;
right = ucontrol->value.integer.value[1] & 1;
spin_lock_irqsave(&chip->mixer_lock, flags);
- change = chip->capture_source[addr][0] != left &&
+ change = chip->capture_source[addr][0] != left ||
chip->capture_source[addr][1] != right;
chip->capture_source[addr][0] = left;
chip->capture_source[addr][1] = right;
spin_unlock_irqrestore(&chip->mixer_lock, flags);
- switch (dev->pci->device) {
+ if (change) {
+ switch (dev->pci->device) {
case PCI_DEVICE_ID_PHILIPS_SAA7134:
switch (addr) {
saa_dsp_writel(dev, SAA7133_DIGITAL_INPUT_XBAR1, 0);
saa_writel(SAA7133_ANALOG_IO_SELECT, 0);
}
- }
+ }
+ }
return change;
}
SAA713x_CAPSRC("Line Capture Switch", 2, MIXER_ADDR_LINE2),
};
-static int __init snd_card_saa7134_new_mixer(snd_card_saa7134_t * chip)
+/*
+ * ALSA mixer setup
+ *
+ * Called when initializing the board. Sets up the name and hooks up
+ * the callbacks
+ *
+ */
+
+static int snd_card_saa7134_new_mixer(snd_card_saa7134_t * chip)
{
snd_card_t *card = chip->card;
unsigned int idx;
return snd_saa7134_free(chip);
}
+/*
+ * ALSA initialization
+ *
+ * Called by saa7134-core, it creates the basic structures and registers
+ * the ALSA devices
+ *
+ */
+
int alsa_card_saa7134_create(struct saa7134_dev *saadev)
{
static int dev;
snd_card_t *card;
- struct snd_card_saa7134 *chip;
+ snd_card_saa7134_t *chip;
int err;
static snd_device_ops_t ops = {
.dev_free = snd_saa7134_dev_free,
return -ENODEV;
if (!enable[dev])
return -ENODEV;
+
card = snd_card_new(index[dev], id[dev], THIS_MODULE,
- sizeof(struct snd_card_saa7134));
+ 0);
if (card == NULL)
return -ENOMEM;
strcpy(card->driver, "SAA7134");
/* Card "creation" */
+
chip = kcalloc(1, sizeof(*chip), GFP_KERNEL);
if (chip == NULL) {
return -ENOMEM;
chip->saadev = saadev;
chip->card = card;
+
chip->pci = saadev->pci;
chip->irq = saadev->pci->irq;
chip->iobase = pci_resource_start(saadev->pci, 0);
return err;
}
-
if ((err = snd_card_saa7134_new_mixer(chip)) < 0)
goto __nodev;
if ((err = snd_card_saa7134_pcm(chip, 0)) < 0)
goto __nodev;
+
spin_lock_init(&chip->mixer_lock);
snd_card_set_dev(card, &chip->pci->dev);
sprintf(card->longname, "%s at 0x%lx irq %d",
card->shortname, chip->iobase, chip->irq);
-
if ((err = snd_card_register(card)) == 0) {
snd_saa7134_cards[dev] = card;
return 0;
projects / GitHub / LineageOS / android_kernel_samsung_universal7580.git / commitdiff