[PATCH] v4l: 725: fixed kernel oops when hotswapping pc cards
- Fixed kernel oops when hotswapping PC Cards Signed-off-by: Ricardo Cerqueira <v4l@cerqueira.org> Signed-off-by: Nickolay V. Shmyrev <nshmyrev@yandex.ru> Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ricardo Cerqueira
Linus Torvalds
Родитель
c06f57f55a
Коммит
b2c15ea9b2
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@ -4,15 +4,7 @@
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*
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*
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* Caveats:
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* I still haven't got the mixer settings right.
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*
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* - Volume doesn't work (it's always at max)
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* - There's no "memory" of the capture channel. It can be changed,
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* but alsamixer doesn't show it after a module restart (rmmod/insmod)
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*
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* Hotswapping DOES NOT work yet! Please remove the module before
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* inserting cardbus cards. pcmcia-cs or pccardd should load it
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* properly after insertion, and things will work
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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@ -49,6 +41,10 @@ static unsigned int alsa_debug = 0;
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module_param(alsa_debug, int, 0644);
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MODULE_PARM_DESC(alsa_debug,"enable debug messages [alsa]");
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/*
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* Configuration macros
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*/
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#define MAX_PCM_DEVICES 1
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#define MAX_PCM_SUBSTREAMS 1
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@ -67,20 +63,21 @@ MODULE_PARM_DESC(alsa_debug,"enable debug messages [alsa]");
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#define USE_PERIODS_MAX 1024
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#endif
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#define dprintk(fmt, arg...) if (alsa_debug) \
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printk(KERN_DEBUG "%s/alsa: " fmt, dev->name , ## arg)
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static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
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static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
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static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
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#define MIXER_ADDR_TVTUNER 0
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#define MIXER_ADDR_LINE1 1
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#define MIXER_ADDR_LINE2 2
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#define MIXER_ADDR_LAST 2
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static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
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static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
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static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
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#define dprintk(fmt, arg...) if (alsa_debug) \
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printk(KERN_DEBUG "%s/alsa: " fmt, dev->name , ## arg)
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/*
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* Main chip structure
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*/
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typedef struct snd_card_saa7134 {
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snd_card_t *card;
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spinlock_t mixer_lock;
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@ -95,6 +92,10 @@ typedef struct snd_card_saa7134 {
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spinlock_t lock;
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} snd_card_saa7134_t;
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/*
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* PCM structure
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*/
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typedef struct snd_card_saa7134_pcm {
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struct saa7134_dev *saadev;
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@ -107,13 +108,34 @@ typedef struct snd_card_saa7134_pcm {
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static snd_card_t *snd_saa7134_cards[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;
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/*
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* saa7134 DMA audio stop
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*
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* Called when the capture device is released or the buffer overflows
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*
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* - Copied verbatim from saa7134-oss's dsp_dma_stop. Can be dropped
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* if we just share dsp_dma_stop and use it here
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*
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*/
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static void saa7134_dma_stop(struct saa7134_dev *dev)
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{
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dev->oss.dma_blk = -1;
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dev->oss.dma_running = 0;
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saa7134_set_dmabits(dev);
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}
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/*
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* saa7134 DMA audio start
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*
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* Called when preparing the capture device for use
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*
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* - Copied verbatim from saa7134-oss's dsp_dma_start. Can be dropped
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* if we just share dsp_dma_start and use it here
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*
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*/
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static void saa7134_dma_start(struct saa7134_dev *dev)
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{
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dev->oss.dma_blk = 0;
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@ -121,6 +143,17 @@ static void saa7134_dma_start(struct saa7134_dev *dev)
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saa7134_set_dmabits(dev);
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}
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/*
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* saa7134 audio DMA IRQ handler
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*
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* Called whenever we get an SAA7134_IRQ_REPORT_DONE_RA3 interrupt
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* Handles shifting between the 2 buffers, manages the read counters,
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* and notifies ALSA when periods elapse
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*
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* - Mostly copied from saa7134-oss's saa7134_irq_oss_done.
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*
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*/
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void saa7134_irq_alsa_done(struct saa7134_dev *dev, unsigned long status)
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{
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int next_blk, reg = 0;
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@ -179,6 +212,15 @@ void saa7134_irq_alsa_done(struct saa7134_dev *dev, unsigned long status)
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}
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/*
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* ALSA capture trigger
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*
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* - One of the ALSA capture callbacks.
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*
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* Called whenever a capture is started or stopped. Must be defined,
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* but there's nothing we want to do here
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*
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*/
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static int snd_card_saa7134_capture_trigger(snd_pcm_substream_t * substream,
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int cmd)
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@ -186,6 +228,18 @@ static int snd_card_saa7134_capture_trigger(snd_pcm_substream_t * substream,
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return 0;
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}
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/*
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* DMA buffer config
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*
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* Sets the values that will later be used as the size of the buffer,
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* size of the fragments, and total number of fragments.
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* Must be called during the preparation stage, before memory is
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* allocated
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*
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* - Copied verbatim from saa7134-oss. Can be dropped
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* if we just share dsp_buffer_conf from OSS.
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*/
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static int dsp_buffer_conf(struct saa7134_dev *dev, int blksize, int blocks)
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{
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if (blksize < 0x100)
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@ -207,6 +261,17 @@ static int dsp_buffer_conf(struct saa7134_dev *dev, int blksize, int blocks)
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return 0;
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}
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/*
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* DMA buffer initialization
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*
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* Uses V4L functions to initialize the DMA. Shouldn't be necessary in
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* ALSA, but I was unable to use ALSA's own DMA, and had to force the
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* usage of V4L's
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*
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* - Copied verbatim from saa7134-oss. Can be dropped
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* if we just share dsp_buffer_init from OSS.
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*/
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static int dsp_buffer_init(struct saa7134_dev *dev)
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{
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int err;
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@ -221,8 +286,19 @@ static int dsp_buffer_init(struct saa7134_dev *dev)
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return 0;
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}
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/*
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* ALSA PCM preparation
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*
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* - One of the ALSA capture callbacks.
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*
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* Called right after the capture device is opened, this function configures
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* the buffer using the previously defined functions, allocates the memory,
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* sets up the hardware registers, and then starts the DMA. When this function
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* returns, the audio should be flowing.
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*
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*/
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static int snd_card_saa7134_pcm_prepare(snd_pcm_substream_t * substream)
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static int snd_card_saa7134_capture_prepare(snd_pcm_substream_t * substream)
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{
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snd_pcm_runtime_t *runtime = substream->runtime;
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int err, bswap, sign;
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@ -329,7 +405,6 @@ static int snd_card_saa7134_pcm_prepare(snd_pcm_substream_t * substream)
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fmt |= (2 << 4);
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if (!sign)
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fmt |= 0x04;
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//saa_writel(SAA7133_NUM_SAMPLES, dev->oss.blksize -1);
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saa_writel(SAA7133_NUM_SAMPLES, dev->oss.blksize -1);
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saa_writel(SAA7133_AUDIO_CHANNEL, 0x543210 | (fmt << 24));
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//saa_writel(SAA7133_AUDIO_CHANNEL, 0x543210);
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@ -346,7 +421,12 @@ static int snd_card_saa7134_pcm_prepare(snd_pcm_substream_t * substream)
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if (bswap)
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control |= SAA7134_RS_CONTROL_BSWAP;
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/* I should be able to use runtime->dma_addr in the control
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byte, but it doesn't work. So I allocate the DMA using the
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V4L functions, and force ALSA to use that as the DMA area */
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runtime->dma_area = dev->oss.dma.vmalloc;
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saa_writel(SAA7134_RS_BA1(6),0);
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saa_writel(SAA7134_RS_BA2(6),dev->oss.blksize);
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saa_writel(SAA7134_RS_PITCH(6),0);
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@ -368,12 +448,18 @@ static int snd_card_saa7134_pcm_prepare(snd_pcm_substream_t * substream)
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}
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static int snd_card_saa7134_capture_prepare(snd_pcm_substream_t * substream)
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{
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return snd_card_saa7134_pcm_prepare(substream);
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}
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/*
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* ALSA pointer fetching
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*
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* - One of the ALSA capture callbacks.
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*
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* Called whenever a period elapses, it must return the current hardware
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* position of the buffer.
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* Also resets the read counter used to prevent overruns
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*
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*/
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static snd_pcm_uframes_t snd_card_saa7134_pointer(snd_pcm_substream_t * substream)
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static snd_pcm_uframes_t snd_card_saa7134_capture_pointer(snd_pcm_substream_t * substream)
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{
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snd_pcm_runtime_t *runtime = substream->runtime;
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snd_card_saa7134_pcm_t *saapcm = runtime->private_data;
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@ -388,15 +474,12 @@ static snd_pcm_uframes_t snd_card_saa7134_pointer(snd_pcm_substream_t * substrea
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dev->oss.read_offset = 0;
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}
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//return bytes_to_frames(runtime, saa_readl(dev->oss.recording_on));
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return bytes_to_frames(runtime, dev->oss.read_offset);
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}
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static snd_pcm_uframes_t snd_card_saa7134_capture_pointer(snd_pcm_substream_t * substream)
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{
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return snd_card_saa7134_pointer(substream);
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}
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/*
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* ALSA hardware capabilities definition
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*/
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static snd_pcm_hardware_t snd_card_saa7134_capture =
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{
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@ -425,6 +508,17 @@ static void snd_card_saa7134_runtime_free(snd_pcm_runtime_t *runtime)
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}
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/*
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* ALSA hardware params
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*
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* - One of the ALSA capture callbacks.
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*
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* Called on initialization, right before the PCM preparation
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* Usually used in ALSA to allocate the DMA, but since we don't use the
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* ALSA DMA I'm almost sure this isn't necessary.
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*
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*/
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static int snd_card_saa7134_hw_params(snd_pcm_substream_t * substream,
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snd_pcm_hw_params_t * hw_params)
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{
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@ -434,11 +528,29 @@ static int snd_card_saa7134_hw_params(snd_pcm_substream_t * substream,
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}
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/*
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* ALSA hardware release
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*
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* - One of the ALSA capture callbacks.
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*
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* Called after closing the device, but before snd_card_saa7134_capture_close
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* Usually used in ALSA to free the DMA, but since we don't use the
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* ALSA DMA I'm almost sure this isn't necessary.
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*
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*/
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static int snd_card_saa7134_hw_free(snd_pcm_substream_t * substream)
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{
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return snd_pcm_lib_free_pages(substream);
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}
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/*
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* DMA buffer release
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*
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* Called after closing the device, during snd_card_saa7134_capture_close
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*
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*/
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static int dsp_buffer_free(struct saa7134_dev *dev)
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{
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if (!dev->oss.blksize)
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@ -453,9 +565,20 @@ static int dsp_buffer_free(struct saa7134_dev *dev)
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return 0;
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}
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/*
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* ALSA capture finish
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*
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* - One of the ALSA capture callbacks.
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*
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* Called after closing the device. It stops the DMA audio and releases
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* the buffers
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*
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*/
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static int saa7134_cap_close(struct saa7134_dev *dev)
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static int snd_card_saa7134_capture_close(snd_pcm_substream_t * substream)
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{
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snd_card_saa7134_t *chip = snd_pcm_substream_chip(substream);
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struct saa7134_dev *dev = chip->saadev;
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unsigned long flags;
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/* stop dma */
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@ -471,8 +594,23 @@ static int saa7134_cap_close(struct saa7134_dev *dev)
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return 0;
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}
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/*
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* ALSA capture start
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*
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* - One of the ALSA capture callbacks.
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*
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* Called when opening the device. It creates and populates the PCM
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* structure
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*
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*/
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static int saa7134_cap_open(struct saa7134_dev *dev) {
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static int snd_card_saa7134_capture_open(snd_pcm_substream_t * substream)
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{
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snd_pcm_runtime_t *runtime = substream->runtime;
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snd_card_saa7134_pcm_t *saapcm;
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snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
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struct saa7134_dev *dev = saa7134->saadev;
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int err;
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down(&dev->oss.lock);
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@ -483,18 +621,6 @@ static int saa7134_cap_open(struct saa7134_dev *dev) {
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up(&dev->oss.lock);
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return 0;
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}
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static int snd_card_saa7134_capture_open(snd_pcm_substream_t * substream)
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{
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snd_pcm_runtime_t *runtime = substream->runtime;
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snd_card_saa7134_pcm_t *saapcm;
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snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
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int err;
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saa7134_cap_open(saa7134->saadev);
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saapcm = kcalloc(1, sizeof(*saapcm), GFP_KERNEL);
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if (saapcm == NULL)
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return -ENOMEM;
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@ -513,13 +639,9 @@ static int snd_card_saa7134_capture_open(snd_pcm_substream_t * substream)
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return 0;
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}
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static int snd_card_saa7134_capture_close(snd_pcm_substream_t * substream)
|
||||
{
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snd_card_saa7134_t *chip = snd_pcm_substream_chip(substream);
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saa7134_cap_close(chip->saadev);
|
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return 0;
|
||||
}
|
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/*
|
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* ALSA capture callbacks definition
|
||||
*/
|
||||
|
||||
static snd_pcm_ops_t snd_card_saa7134_capture_ops = {
|
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.open = snd_card_saa7134_capture_open,
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@ -532,7 +654,15 @@ static snd_pcm_ops_t snd_card_saa7134_capture_ops = {
|
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.pointer = snd_card_saa7134_capture_pointer,
|
||||
};
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||||
|
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static int __init snd_card_saa7134_pcm(snd_card_saa7134_t *saa7134, int device)
|
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/*
|
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* 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;
|
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int err;
|
||||
|
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@ -612,7 +742,7 @@ static int snd_saa7134_volume_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_
|
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static int snd_saa7134_capsrc_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
|
||||
{
|
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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;
|
||||
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@ -647,7 +777,7 @@ static int snd_saa7134_capsrc_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_
|
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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;
|
||||
|
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@ -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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