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raspberrypi-kernel
提交 b2c15ea9 编写于 作者: R Ricardo Cerqueira 提交者： Linus Torvalds
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[PATCH] v4l: 725: fixed kernel oops when hotswapping pc cards 

- Fixed kernel oops when hotswapping PC Cards
Signed-off-by: NRicardo Cerqueira <v4l@cerqueira.org>
Signed-off-by: NNickolay V. Shmyrev <nshmyrev@yandex.ru>
Signed-off-by: NMauro Carvalho Chehab <mchehab@brturbo.com.br>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
上级 c06f57f5
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Showing with 210 addition and 60 deletion
drivers/media/video/saa7134/saa7134-alsa.c
浏览文件 @ b2c15ea9
......@@ -4,15 +4,7 @@
*
*
* 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
......@@ -49,6 +41,10 @@ static unsigned int alsa_debug = 0;
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
......@@ -67,20 +63,21 @@ MODULE_PARM_DESC(alsa_debug,"enable debug messages [alsa]");
#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;
......@@ -95,6 +92,10 @@ typedef struct snd_card_saa7134 {
spinlock_t lock;
} snd_card_saa7134_t;
/*
* PCM structure
*/
typedef struct snd_card_saa7134_pcm {
struct saa7134_dev *saadev;
......@@ -107,13 +108,34 @@ typedef struct snd_card_saa7134_pcm {
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;
......@@ -121,6 +143,17 @@ static void saa7134_dma_start(struct saa7134_dev *dev)
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;
......@@ -179,6 +212,15 @@ void saa7134_irq_alsa_done(struct saa7134_dev *dev, unsigned long status)
}
/*
* 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)
......@@ -186,6 +228,18 @@ static int snd_card_saa7134_capture_trigger(snd_pcm_substream_t * substream,
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)
......@@ -207,6 +261,17 @@ static int dsp_buffer_conf(struct saa7134_dev *dev, int blksize, int blocks)
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;
......@@ -221,8 +286,19 @@ static int dsp_buffer_init(struct saa7134_dev *dev)
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;
......@@ -329,7 +405,6 @@ static int snd_card_saa7134_pcm_prepare(snd_pcm_substream_t * substream)
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);
......@@ -346,7 +421,12 @@ static int snd_card_saa7134_pcm_prepare(snd_pcm_substream_t * substream)
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);
......@@ -368,12 +448,18 @@ static int snd_card_saa7134_pcm_prepare(snd_pcm_substream_t * substream)
}
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;
......@@ -388,15 +474,12 @@ static snd_pcm_uframes_t snd_card_saa7134_pointer(snd_pcm_substream_t * substrea
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 =
{
......@@ -425,6 +508,17 @@ static void snd_card_saa7134_runtime_free(snd_pcm_runtime_t *runtime)
}
/*
* 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)
{
......@@ -434,11 +528,29 @@ static int snd_card_saa7134_hw_params(snd_pcm_substream_t * substream,
}
/*
* 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)
......@@ -453,9 +565,20 @@ static int dsp_buffer_free(struct saa7134_dev *dev)
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 */
......@@ -471,8 +594,23 @@ static int saa7134_cap_close(struct saa7134_dev *dev)
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);
......@@ -483,18 +621,6 @@ static int saa7134_cap_open(struct saa7134_dev *dev) {
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;
......@@ -513,13 +639,9 @@ static int snd_card_saa7134_capture_open(snd_pcm_substream_t * substream)
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,
......@@ -532,7 +654,15 @@ static snd_pcm_ops_t snd_card_saa7134_capture_ops = {
.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;
......@@ -612,7 +742,7 @@ static int snd_saa7134_volume_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_
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;
......@@ -647,7 +777,7 @@ static int snd_saa7134_capsrc_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_
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;
......@@ -655,7 +785,8 @@ static int snd_saa7134_capsrc_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_
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) {
......@@ -702,7 +833,8 @@ static int snd_saa7134_capsrc_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_
saa_dsp_writel(dev, SAA7133_DIGITAL_INPUT_XBAR1, 0);
saa_writel(SAA7133_ANALOG_IO_SELECT, 0);
}
}
}
}
return change;
}
......@@ -716,7 +848,15 @@ SAA713x_VOLUME("Line Volume", 2, MIXER_ADDR_LINE2),
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;
......@@ -743,11 +883,19 @@ static int snd_saa7134_dev_free(snd_device_t *device)
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,
......@@ -757,14 +905,16 @@ int alsa_card_saa7134_create(struct saa7134_dev *saadev)
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;
......@@ -775,6 +925,7 @@ int alsa_card_saa7134_create(struct saa7134_dev *saadev)
chip->saadev = saadev;
chip->card = card;
chip->pci = saadev->pci;
chip->irq = saadev->pci->irq;
chip->iobase = pci_resource_start(saadev->pci, 0);
......@@ -784,12 +935,12 @@ int alsa_card_saa7134_create(struct saa7134_dev *saadev)
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);
......@@ -800,7 +951,6 @@ int alsa_card_saa7134_create(struct saa7134_dev *saadev)
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;
......
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