修改内核的s3c2410-wm8976.c文件，让其支持开发板的声卡
框架入口源文件：s3c2410-wm8976.c
（可根据入口源文件，再按着框架到内核走一遍）
内核版本：linux_2.6.22.6 硬件平台：JZ2440
以下是驱动框架：
以下是驱动代码：
#include <linux/module.h> #include <linux/device.h> #include <linux/init.h> #include <linux/types.h> #include <linux/fs.h> #include <linux/mm.h> #include <linux/slab.h> #include <linux/delay.h> #include <linux/sched.h> #include <linux/poll.h> #include <linux/interrupt.h> #include <linux/errno.h> #include <linux/sound.h> #include <linux/soundcard.h> #include <linux/pm.h> #include <linux/clk.h> #include <linux/platform_device.h> #include <asm/uaccess.h> #include <asm/io.h> #include <asm/hardware.h> #include <asm/semaphore.h> #include <asm/dma.h> #include <asm/arch/dma.h> #include <asm/arch/regs-gpio.h> #include <asm/arch/regs-iis.h> #include <asm/arch/regs-clock.h> #include <linux/dma-mapping.h> #include <asm/dma-mapping.h> #include <asm/arch/hardware.h> #include <asm/arch/map.h> #define PFX "s3c2410-uda1341-superlp: " #define MAX_DMA_CHANNELS 0 /* The S3C2410 has four internal DMA channels. */ #define MAX_S3C2410_DMA_CHANNELS S3C2410_DMA_CHANNELS #define DMA_BUF_WR 1 #define DMA_BUF_RD 0 #define dma_wrreg(chan, reg, val) __raw_writel((val), (chan)->regs + (reg)) static struct clk *iis_clock; static void __iomem *iis_base; static struct s3c2410_dma_client s3c2410iis_dma_out= { .name = "I2SSDO", }; static struct s3c2410_dma_client s3c2410iis_dma_in = { .name = "I2SSDI", }; #ifdef DEBUG #define DPRINTK printk #else #define DPRINTK( x... ) #endif static void init_s3c2410_iis_bus_rx(void); static void init_s3c2410_iis_bus_tx(void); #define DEF_VOLUME 65 /* UDA1341 Register bits */ #define UDA1341_ADDR 0x14 #define UDA1341_REG_DATA0 (UDA1341_ADDR + 0) #define UDA1341_REG_STATUS (UDA1341_ADDR + 2) /* status control */ #define STAT0 (0x00) #define STAT0_RST (1 << 6) #define STAT0_SC_MASK (3 << 4) #define STAT0_SC_512FS (0 << 4) #define STAT0_SC_384FS (1 << 4) #define STAT0_SC_256FS (2 << 4) #define STAT0_IF_MASK (7 << 1) #define STAT0_IF_I2S (0 << 1) #define STAT0_IF_LSB16 (1 << 1) #define STAT0_IF_LSB18 (2 << 1) #define STAT0_IF_LSB20 (3 << 1) #define STAT0_IF_MSB (4 << 1) #define STAT0_IF_LSB16MSB (5 << 1) #define STAT0_IF_LSB18MSB (6 << 1) #define STAT0_IF_LSB20MSB (7 << 1) #define STAT0_DC_FILTER (1 << 0) #define STAT0_DC_NO_FILTER (0 << 0) #define STAT1 (0x80) #define STAT1_DAC_GAIN (1 << 6) /* gain of DAC */ #define STAT1_ADC_GAIN (1 << 5) /* gain of ADC */ #define STAT1_ADC_POL (1 << 4) /* polarity of ADC */ #define STAT1_DAC_POL (1 << 3) /* polarity of DAC */ #define STAT1_DBL_SPD (1 << 2) /* double speed playback */ #define STAT1_ADC_ON (1 << 1) /* ADC powered */ #define STAT1_DAC_ON (1 << 0) /* DAC powered */ /* data0 direct control */ #define DATA0 (0x00) #define DATA0_VOLUME_MASK (0x3f) #define DATA0_VOLUME(x) (x) #define DATA1 (0x40) #define DATA1_BASS(x) ((x) << 2) #define DATA1_BASS_MASK (15 << 2) #define DATA1_TREBLE(x) ((x)) #define DATA1_TREBLE_MASK (3) #define DATA2 (0x80) #define DATA2_PEAKAFTER (0x1 << 5) #define DATA2_DEEMP_NONE (0x0 << 3) #define DATA2_DEEMP_32KHz (0x1 << 3) #define DATA2_DEEMP_44KHz (0x2 << 3) #define DATA2_DEEMP_48KHz (0x3 << 3) #define DATA2_MUTE (0x1 << 2) #define DATA2_FILTER_FLAT (0x0 << 0) #define DATA2_FILTER_MIN (0x1 << 0) #define DATA2_FILTER_MAX (0x3 << 0) /* data0 extend control */ #define EXTADDR(n) (0xc0 | (n)) #define EXTDATA(d) (0xe0 | (d)) #define EXT0 0 #define EXT0_CH1_GAIN(x) (x) #define EXT1 1 #define EXT1_CH2_GAIN(x) (x) #define EXT2 2 #define EXT2_MIC_GAIN_MASK (7 << 2) #define EXT2_MIC_GAIN(x) ((x) << 2) #define EXT2_MIXMODE_DOUBLEDIFF (0) #define EXT2_MIXMODE_CH1 (1) #define EXT2_MIXMODE_CH2 (2) #define EXT2_MIXMODE_MIX (3) #define EXT4 4 #define EXT4_AGC_ENABLE (1 << 4) #define EXT4_INPUT_GAIN_MASK (3) #define EXT4_INPUT_GAIN(x) ((x) & 3) #define EXT5 5 #define EXT5_INPUT_GAIN(x) ((x) >> 2) #define EXT6 6 #define EXT6_AGC_CONSTANT_MASK (7 << 2) #define EXT6_AGC_CONSTANT(x) ((x) << 2) #define EXT6_AGC_LEVEL_MASK (3) #define EXT6_AGC_LEVEL(x) (x) #define AUDIO_NAME "UDA1341" #define AUDIO_NAME_VERBOSE "UDA1341 audio driver" #define AUDIO_FMT_MASK (AFMT_S16_LE) #define AUDIO_FMT_DEFAULT (AFMT_S16_LE) #define AUDIO_CHANNELS_DEFAULT 2 #define AUDIO_RATE_DEFAULT 44100 #define AUDIO_NBFRAGS_DEFAULT 8 #define AUDIO_FRAGSIZE_DEFAULT 8192 #define S_CLOCK_FREQ 384 #define PCM_ABS(a) (a < 0 ? -a : a) typedef struct { int size; /* buffer size */ char *start; /* point to actual buffer */ dma_addr_t dma_addr; /* physical buffer address */ struct semaphore sem; /* down before touching the buffer */ int master; /* owner for buffer allocation, contain size when true */ } audio_buf_t; typedef struct { audio_buf_t *buffers; /* pointer to audio buffer structures */ audio_buf_t *buf; /* current buffer used by read/write */ u_int buf_idx; /* index for the pointer above */ u_int fragsize; /* fragment i.e. buffer size */ u_int nbfrags; /* nbr of fragments */ dmach_t dma_ch; /* DMA channel (channel2 for audio) */ u_int dma_ok; } audio_stream_t; static audio_stream_t output_stream; static audio_stream_t input_stream; /* input */ #define NEXT_BUF(_s_,_b_) { (_s_)->_b_##_idx++; (_s_)->_b_##_idx %= (_s_)->nbfrags; (_s_)->_b_ = (_s_)->buffers + (_s_)->_b_##_idx; } static u_int audio_rate; static int audio_channels; static int audio_fmt; static u_int audio_fragsize; static u_int audio_nbfrags; static int audio_rd_refcount; static int audio_wr_refcount; #define audio_active (audio_rd_refcount | audio_wr_refcount) static int audio_dev_dsp; static int audio_dev_mixer; static int audio_mix_modcnt; static int uda1341_volume; //static u8 uda_sampling; static int uda1341_boost; static int mixer_igain=0x4; /* -6db*/ static void uda1341_l3_address(u8 data) { int i; unsigned long flags; local_irq_save(flags); // write_gpio_bit(GPIO_L3MODE, 0); s3c2410_gpio_setpin(S3C2410_GPB2,0); // write_gpio_bit(GPIO_L3CLOCK, 1); s3c2410_gpio_setpin(S3C2410_GPB4,1); udelay(1); for (i = 0; i < 8; i++) { if (data & 0x1) { s3c2410_gpio_setpin(S3C2410_GPB4,0); s3c2410_gpio_setpin(S3C2410_GPB3,1); udelay(1); s3c2410_gpio_setpin(S3C2410_GPB4,1); } else { s3c2410_gpio_setpin(S3C2410_GPB4,0); s3c2410_gpio_setpin(S3C2410_GPB3,0); udelay(1); s3c2410_gpio_setpin(S3C2410_GPB4,1); } data >>= 1; } s3c2410_gpio_setpin(S3C2410_GPB2,1); s3c2410_gpio_setpin(S3C2410_GPB4,1); local_irq_restore(flags); } static void uda1341_l3_data(u8 data) { int i; unsigned long flags; local_irq_save(flags); udelay(1); for (i = 0; i < 8; i++) { if (data & 0x1) { s3c2410_gpio_setpin(S3C2410_GPB4,0); s3c2410_gpio_setpin(S3C2410_GPB3,1); udelay(1); s3c2410_gpio_setpin(S3C2410_GPB4,1); } else { s3c2410_gpio_setpin(S3C2410_GPB4,0); s3c2410_gpio_setpin(S3C2410_GPB3,0); udelay(1); s3c2410_gpio_setpin(S3C2410_GPB4,1); } data >>= 1; } local_irq_restore(flags); } static void audio_clear_buf(audio_stream_t * s) { DPRINTK("audio_clear_buf "); if(s->dma_ok) s3c2410_dma_ctrl(s->dma_ch, S3C2410_DMAOP_FLUSH); if (s->buffers) { int frag; for (frag = 0; frag < s->nbfrags; frag++) { if (!s->buffers[frag].master) continue; dma_free_coherent(NULL, s->buffers[frag].master, s->buffers[frag].start, s->buffers[frag].dma_addr); } kfree(s->buffers); s->buffers = NULL; } s->buf_idx = 0; s->buf = NULL; } static int audio_setup_buf(audio_stream_t * s) { int frag; int dmasize = 0; char *dmabuf = 0; dma_addr_t dmaphys = 0; if (s->buffers) return -EBUSY; s->nbfrags = audio_nbfrags; s->fragsize = audio_fragsize; s->buffers = (audio_buf_t *) kmalloc(sizeof(audio_buf_t) * s->nbfrags, GFP_KERNEL); if (!s->buffers) goto err; memset(s->buffers, 0, sizeof(audio_buf_t) * s->nbfrags); for (frag = 0; frag < s->nbfrags; frag++) { audio_buf_t *b = &s->buffers[frag]; if (!dmasize) { dmasize = (s->nbfrags - frag) * s->fragsize; do { dmabuf = dma_alloc_coherent(NULL, dmasize, &dmaphys, GFP_KERNEL|GFP_DMA); if (!dmabuf) dmasize -= s->fragsize; } while (!dmabuf && dmasize); if (!dmabuf) goto err; b->master = dmasize; } b->start = dmabuf; b->dma_addr = dmaphys; sema_init(&b->sem, 1); DPRINTK("buf %d: start %p dma %d ", frag, b->start, b->dma_addr); dmabuf += s->fragsize; dmaphys += s->fragsize; dmasize -= s->fragsize; } s->buf_idx = 0; s->buf = &s->buffers[0]; return 0; err: printk(AUDIO_NAME ": unable to allocate audio memory "); audio_clear_buf(s); return -ENOMEM; } static void audio_dmaout_done_callback(struct s3c2410_dma_chan *ch, void *buf, int size, enum s3c2410_dma_buffresult result) { audio_buf_t *b = (audio_buf_t *) buf; up(&b->sem); wake_up(&b->sem.wait); } static void audio_dmain_done_callback(struct s3c2410_dma_chan *ch, void *buf, int size, enum s3c2410_dma_buffresult result) { audio_buf_t *b = (audio_buf_t *) buf; b->size = size; up(&b->sem); wake_up(&b->sem.wait); } /* using when write */ static int audio_sync(struct file *file) { audio_stream_t *s = &output_stream; audio_buf_t *b = s->buf; DPRINTK("audio_sync "); if (!s->buffers) return 0; if (b->size != 0) { down(&b->sem); s3c2410_dma_enqueue(s->dma_ch, (void *) b, b->dma_addr, b->size); b->size = 0; NEXT_BUF(s, buf); } b = s->buffers + ((s->nbfrags + s->buf_idx - 1) % s->nbfrags); if (down_interruptible(&b->sem)) return -EINTR; up(&b->sem); return 0; } static inline int copy_from_user_mono_stereo(char *to, const char *from, int count) { u_int *dst = (u_int *)to; const char *end = from + count; if (access_ok(VERIFY_READ, from, count)) return -EFAULT; if ((int)from & 0x2) { u_int v; __get_user(v, (const u_short *)from); from += 2; *dst++ = v | (v << 16); } while (from < end-2) { u_int v, x, y; __get_user(v, (const u_int *)from); from += 4; x = v << 16; x |= x >> 16; y = v >> 16; y |= y << 16; *dst++ = x; *dst++ = y; } if (from < end) { u_int v; __get_user(v, (const u_short *)from); *dst = v | (v << 16); } return 0; } static ssize_t smdk2410_audio_write(struct file *file, const char *buffer, size_t count, loff_t * ppos) { const char *buffer0 = buffer; audio_stream_t *s = &output_stream; int chunksize, ret = 0; DPRINTK("audio_write : start count=%d ", count); switch (file->f_flags & O_ACCMODE) { case O_WRONLY: case O_RDWR: break; default: return -EPERM; } if (!s->buffers && audio_setup_buf(s)) return -ENOMEM; count &= ~0x03; while (count > 0) { audio_buf_t *b = s->buf; if (file->f_flags & O_NONBLOCK) { ret = -EAGAIN; if (down_trylock(&b->sem)) break; } else { ret = -ERESTARTSYS; if (down_interruptible(&b->sem)) break; } if (audio_channels == 2) { chunksize = s->fragsize - b->size; if (chunksize > count) chunksize = count; DPRINTK("write %d to %d ", chunksize, s->buf_idx); if (copy_from_user(b->start + b->size, buffer, chunksize)) { up(&b->sem); return -EFAULT; } b->size += chunksize; } else { chunksize = (s->fragsize - b->size) >> 1; if (chunksize > count) chunksize = count; DPRINTK("write %d to %d ", chunksize*2, s->buf_idx); if (copy_from_user_mono_stereo(b->start + b->size, buffer, chunksize)) { up(&b->sem); return -EFAULT; } b->size += chunksize*2; } buffer += chunksize; count -= chunksize; if (b->size < s->fragsize) { up(&b->sem); break; } if((ret = s3c2410_dma_enqueue(s->dma_ch, (void *) b, b->dma_addr, b->size))) { printk(PFX"dma enqueue failed. "); return ret; } b->size = 0; NEXT_BUF(s, buf); } if ((buffer - buffer0)) ret = buffer - buffer0; DPRINTK("audio_write : end count=%d ", ret); return ret; } static ssize_t smdk2410_audio_read(struct file *file, char *buffer, size_t count, loff_t * ppos) { const char *buffer0 = buffer; audio_stream_t *s = &input_stream; int chunksize, ret = 0; DPRINTK("audio_read: count=%d ", count); /* if (ppos != &file->f_pos) return -ESPIPE; */ if (!s->buffers) { int i; if (audio_setup_buf(s)) return -ENOMEM; for (i = 0; i < s->nbfrags; i++) { audio_buf_t *b = s->buf; down(&b->sem); s3c2410_dma_enqueue(s->dma_ch, (void *) b, b->dma_addr, s->fragsize); NEXT_BUF(s, buf); } } while (count > 0) { audio_buf_t *b = s->buf; /* Wait for a buffer to become full */ if (file->f_flags & O_NONBLOCK) { ret = -EAGAIN; if (down_trylock(&b->sem)) break; } else { ret = -ERESTARTSYS; if (down_interruptible(&b->sem)) break; } chunksize = b->size; if (chunksize > count) chunksize = count; DPRINTK("read %d from %d ", chunksize, s->buf_idx); if (copy_to_user(buffer, b->start + s->fragsize - b->size, chunksize)) { up(&b->sem); return -EFAULT; } b->size -= chunksize; buffer += chunksize; count -= chunksize; if (b->size > 0) { up(&b->sem); break; } /* Make current buffer available for DMA again */ s3c2410_dma_enqueue(s->dma_ch, (void *) b, b->dma_addr, s->fragsize); NEXT_BUF(s, buf); } if ((buffer - buffer0)) ret = buffer - buffer0; // DPRINTK("audio_read: return=%d ", ret); return ret; } static unsigned int smdk2410_audio_poll(struct file *file, struct poll_table_struct *wait) { unsigned int mask = 0; int i; DPRINTK("audio_poll(): mode=%s ", (file->f_mode & FMODE_WRITE) ? "w" : ""); if (file->f_mode & FMODE_READ) { if (!input_stream.buffers && audio_setup_buf(&input_stream)) return -ENOMEM; poll_wait(file, &input_stream.buf->sem.wait, wait); for (i = 0; i < input_stream.nbfrags; i++) { if (atomic_read(&input_stream.buffers[i].sem.count) > 0) mask |= POLLIN | POLLWRNORM; break; } } if (file->f_mode & FMODE_WRITE) { if (!output_stream.buffers && audio_setup_buf(&output_stream)) return -ENOMEM; poll_wait(file, &output_stream.buf->sem.wait, wait); for (i = 0; i < output_stream.nbfrags; i++) { if (atomic_read(&output_stream.buffers[i].sem.count) > 0) mask |= POLLOUT | POLLWRNORM; break; } } DPRINTK("audio_poll() returned mask of %s ", (mask & POLLOUT) ? "w" : ""); return mask; } static loff_t smdk2410_audio_llseek(struct file *file, loff_t offset, int origin) { return -ESPIPE; } static void wm8976_write_reg(unsigned char reg, unsigned int data) { int i; unsigned long flags; unsigned short val = (reg << 9) | (data & 0x1ff); s3c2410_gpio_setpin(S3C2410_GPB2,1); s3c2410_gpio_setpin(S3C2410_GPB3,1); s3c2410_gpio_setpin(S3C2410_GPB4,1); local_irq_save(flags); for (i = 0; i < 16; i++){ if (val & (1<<15)) { s3c2410_gpio_setpin(S3C2410_GPB4,0); s3c2410_gpio_setpin(S3C2410_GPB3,1); udelay(1); s3c2410_gpio_setpin(S3C2410_GPB4,1); } else { s3c2410_gpio_setpin(S3C2410_GPB4,0); s3c2410_gpio_setpin(S3C2410_GPB3,0); udelay(1); s3c2410_gpio_setpin(S3C2410_GPB4,1); } val = val << 1; } s3c2410_gpio_setpin(S3C2410_GPB2,0); udelay(1); s3c2410_gpio_setpin(S3C2410_GPB2,1); s3c2410_gpio_setpin(S3C2410_GPB3,1); s3c2410_gpio_setpin(S3C2410_GPB4,1); local_irq_restore(flags); } static int smdk2410_mixer_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { int ret; long val = 0; switch (cmd) { case SOUND_MIXER_INFO: { mixer_info info; strncpy(info.id, "UDA1341", sizeof(info.id)); strncpy(info.name,"Philips UDA1341", sizeof(info.name)); info.modify_counter = audio_mix_modcnt; return copy_to_user((void *)arg, &info, sizeof(info)); } case SOUND_OLD_MIXER_INFO: { _old_mixer_info info; strncpy(info.id, "UDA1341", sizeof(info.id)); strncpy(info.name,"Philips UDA1341", sizeof(info.name)); return copy_to_user((void *)arg, &info, sizeof(info)); } case SOUND_MIXER_READ_STEREODEVS: return put_user(0, (long *) arg); case SOUND_MIXER_READ_CAPS: val = SOUND_CAP_EXCL_INPUT; return put_user(val, (long *) arg); case SOUND_MIXER_WRITE_VOLUME: ret = get_user(val, (long *) arg); if (ret) return ret; /* ioctl: val越大表示音量越大, 0-最小, 100-最大 * UDA1341: 寄存器的值越小音量越大 * WM8976: 52,53号寄存器bit[5:0]表示音量, 值越大音量越大, 0-63 */ uda1341_volume = (((val & 0xff) + 1) * 63) / 100; wm8976_write_reg(52, (1<<8)|uda1341_volume); wm8976_write_reg(53, (1<<8)|uda1341_volume); //uda1341_l3_address(UDA1341_REG_DATA0); //uda1341_l3_data(uda1341_volume); break; case SOUND_MIXER_READ_VOLUME: val = (uda1341_volume * 100) / 63; return put_user(val, (long *) arg); case SOUND_MIXER_READ_IGAIN: val = ((31- mixer_igain) * 100) / 31; return put_user(val, (int *) arg); case SOUND_MIXER_WRITE_IGAIN: ret = get_user(val, (int *) arg); if (ret) return ret; mixer_igain = 31 - (val * 31 / 100); /* use mixer gain channel 1*/ //uda1341_l3_address(UDA1341_REG_DATA0); //uda1341_l3_data(EXTADDR(EXT0)); //uda1341_l3_data(EXTDATA(EXT0_CH1_GAIN(mixer_igain))); break; default: DPRINTK("mixer ioctl %u unknown ", cmd); return -ENOSYS; } audio_mix_modcnt++; return 0; } static int iispsr_value(int s_bit_clock, int sample_rate) { int i, prescaler = 0; unsigned long tmpval; unsigned long tmpval384; unsigned long tmpval384min = 0xffff; tmpval384 = clk_get_rate(iis_clock) / s_bit_clock; // tmpval384 = s3c2410_get_bus_clk(GET_PCLK) / s_bit_clock; for (i = 0; i < 32; i++) { tmpval = tmpval384/(i+1); if (PCM_ABS((sample_rate - tmpval)) < tmpval384min) { tmpval384min = PCM_ABS((sample_rate - tmpval)); prescaler = i; } } DPRINTK("prescaler = %d ", prescaler); return prescaler; } static long audio_set_dsp_speed(long val) { unsigned int prescaler; prescaler=(IISPSR_A(iispsr_value(S_CLOCK_FREQ, val)) | IISPSR_B(iispsr_value(S_CLOCK_FREQ, val))); __raw_writel(prescaler, iis_base + S3C2410_IISPSR); printk(PFX "audio_set_dsp_speed:%ld prescaler:%i ",val,prescaler); return (audio_rate = val); } static int smdk2410_audio_ioctl(struct inode *inode, struct file *file, uint cmd, ulong arg) { long val; switch (cmd) { case SNDCTL_DSP_SETFMT: get_user(val, (long *) arg); if (val & AUDIO_FMT_MASK) { audio_fmt = val; break; } else return -EINVAL; case SNDCTL_DSP_CHANNELS: case SNDCTL_DSP_STEREO: get_user(val, (long *) arg); if (cmd == SNDCTL_DSP_STEREO) val = val ? 2 : 1; if (val != 1 && val != 2) return -EINVAL; audio_channels = val; break; case SOUND_PCM_READ_CHANNELS: put_user(audio_channels, (long *) arg); break; case SNDCTL_DSP_SPEED: get_user(val, (long *) arg); val = audio_set_dsp_speed(val); if (val < 0) return -EINVAL; put_user(val, (long *) arg); break; case SOUND_PCM_READ_RATE: put_user(audio_rate, (long *) arg); break; case SNDCTL_DSP_GETFMTS: put_user(AUDIO_FMT_MASK, (long *) arg); break; case SNDCTL_DSP_GETBLKSIZE: if(file->f_mode & FMODE_WRITE) return put_user(audio_fragsize, (long *) arg); else return put_user(audio_fragsize, (int *) arg); case SNDCTL_DSP_SETFRAGMENT: if (file->f_mode & FMODE_WRITE) { if (output_stream.buffers) return -EBUSY; get_user(val, (long *) arg); audio_fragsize = 1 << (val & 0xFFFF); if (audio_fragsize < 16) audio_fragsize = 16; if (audio_fragsize > 16384) audio_fragsize = 16384; audio_nbfrags = (val >> 16) & 0x7FFF; if (audio_nbfrags < 2) audio_nbfrags = 2; if (audio_nbfrags * audio_fragsize > 128 * 1024) audio_nbfrags = 128 * 1024 / audio_fragsize; if (audio_setup_buf(&output_stream)) return -ENOMEM; } if (file->f_mode & FMODE_READ) { if (input_stream.buffers) return -EBUSY; get_user(val, (int *) arg); audio_fragsize = 1 << (val & 0xFFFF); if (audio_fragsize < 16) audio_fragsize = 16; if (audio_fragsize > 16384) audio_fragsize = 16384; audio_nbfrags = (val >> 16) & 0x7FFF; if (audio_nbfrags < 2) audio_nbfrags = 2; if (audio_nbfrags * audio_fragsize > 128 * 1024) audio_nbfrags = 128 * 1024 / audio_fragsize; if (audio_setup_buf(&input_stream)) return -ENOMEM; } break; case SNDCTL_DSP_SYNC: return audio_sync(file); case SNDCTL_DSP_GETOSPACE: { audio_stream_t *s = &output_stream; audio_buf_info *inf = (audio_buf_info *) arg; int err = access_ok(VERIFY_WRITE, inf, sizeof(*inf)); int i; int frags = 0, bytes = 0; if (err) return err; for (i = 0; i < s->nbfrags; i++) { if (atomic_read(&s->buffers[i].sem.count) > 0) { if (s->buffers[i].size == 0) frags++; bytes += s->fragsize - s->buffers[i].size; } } put_user(frags, &inf->fragments); put_user(s->nbfrags, &inf->fragstotal); put_user(s->fragsize, &inf->fragsize); put_user(bytes, &inf->bytes); break; } case SNDCTL_DSP_GETISPACE: { audio_stream_t *s = &input_stream; audio_buf_info *inf = (audio_buf_info *) arg; int err = access_ok(VERIFY_WRITE, inf, sizeof(*inf)); int i; int frags = 0, bytes = 0; if (!(file->f_mode & FMODE_READ)) return -EINVAL; if (err) return err; for(i = 0; i < s->nbfrags; i++){ if (atomic_read(&s->buffers[i].sem.count) > 0) { if (s->buffers[i].size == s->fragsize) frags++; bytes += s->buffers[i].size; } } put_user(frags, &inf->fragments); put_user(s->nbfrags, &inf->fragstotal); put_user(s->fragsize, &inf->fragsize); put_user(bytes, &inf->bytes); break; } case SNDCTL_DSP_RESET: if (file->f_mode & FMODE_READ) { audio_clear_buf(&input_stream); } if (file->f_mode & FMODE_WRITE) { audio_clear_buf(&output_stream); } return 0; case SNDCTL_DSP_NONBLOCK: file->f_flags |= O_NONBLOCK; return 0; case SNDCTL_DSP_POST: case SNDCTL_DSP_SUBDIVIDE: case SNDCTL_DSP_GETCAPS: case SNDCTL_DSP_GETTRIGGER: case SNDCTL_DSP_SETTRIGGER: case SNDCTL_DSP_GETIPTR: case SNDCTL_DSP_GETOPTR: case SNDCTL_DSP_MAPINBUF: case SNDCTL_DSP_MAPOUTBUF: case SNDCTL_DSP_SETSYNCRO: case SNDCTL_DSP_SETDUPLEX: return -ENOSYS; default: return smdk2410_mixer_ioctl(inode, file, cmd, arg); } return 0; } static int smdk2410_audio_open(struct inode *inode, struct file *file) { int cold = !audio_active; DPRINTK("audio_open "); if ((file->f_flags & O_ACCMODE) == O_RDONLY) { if (audio_rd_refcount || audio_wr_refcount) return -EBUSY; audio_rd_refcount++; } else if ((file->f_flags & O_ACCMODE) == O_WRONLY) { if (audio_wr_refcount) return -EBUSY; audio_wr_refcount++; } else if ((file->f_flags & O_ACCMODE) == O_RDWR) { if (audio_rd_refcount || audio_wr_refcount) return -EBUSY; audio_rd_refcount++; audio_wr_refcount++; } else return -EINVAL; if (cold) { audio_rate = AUDIO_RATE_DEFAULT; audio_channels = AUDIO_CHANNELS_DEFAULT; audio_fragsize = AUDIO_FRAGSIZE_DEFAULT; audio_nbfrags = AUDIO_NBFRAGS_DEFAULT; if ((file->f_mode & FMODE_WRITE)){ init_s3c2410_iis_bus_tx(); audio_clear_buf(&output_stream); } if ((file->f_mode & FMODE_READ)){ init_s3c2410_iis_bus_rx(); audio_clear_buf(&input_stream); } } return 0; } static int smdk2410_mixer_open(struct inode *inode, struct file *file) { return 0; } static int smdk2410_audio_release(struct inode *inode, struct file *file) { DPRINTK("audio_release "); if (file->f_mode & FMODE_READ) { if (audio_rd_refcount == 1) audio_clear_buf(&input_stream); audio_rd_refcount = 0; } if(file->f_mode & FMODE_WRITE) { if (audio_wr_refcount == 1) { audio_sync(file); audio_clear_buf(&output_stream); audio_wr_refcount = 0; } } return 0; } static int smdk2410_mixer_release(struct inode *inode, struct file *file) { return 0; } static struct file_operations smdk2410_audio_fops = { llseek: smdk2410_audio_llseek, write: smdk2410_audio_write, read: smdk2410_audio_read, poll: smdk2410_audio_poll, ioctl: smdk2410_audio_ioctl, open: smdk2410_audio_open, release: smdk2410_audio_release }; static struct file_operations smdk2410_mixer_fops = { ioctl: smdk2410_mixer_ioctl, open: smdk2410_mixer_open, release: smdk2410_mixer_release }; static void init_uda1341(void) { /* GPB 4: L3CLOCK */ /* GPB 3: L3DATA */ /* GPB 2: L3MODE */ unsigned long flags; uda1341_volume = 62 - ((DEF_VOLUME * 61) / 100); uda1341_boost = 0; // uda_sampling = DATA2_DEEMP_NONE; // uda_sampling &= ~(DATA2_MUTE); local_irq_save(flags); s3c2410_gpio_setpin(S3C2410_GPB2,1);//L3MODE=1 s3c2410_gpio_setpin(S3C2410_GPB4,1);//L3CLOCK=1 local_irq_restore(flags); uda1341_l3_address(UDA1341_REG_STATUS); uda1341_l3_data(0x40 | STAT0_SC_384FS | STAT0_IF_MSB|STAT0_DC_FILTER); // reset uda1341 uda1341_l3_data(STAT1 | STAT1_ADC_ON | STAT1_DAC_ON); uda1341_l3_address(UDA1341_REG_DATA0); uda1341_l3_data(DATA0 |DATA0_VOLUME(0x0)); // maximum volume uda1341_l3_data(DATA1 |DATA1_BASS(uda1341_boost)| DATA1_TREBLE(0)); uda1341_l3_data((DATA2 |DATA2_DEEMP_NONE) &~(DATA2_MUTE)); uda1341_l3_data(EXTADDR(EXT2)); uda1341_l3_data(EXTDATA(EXT2_MIC_GAIN(0x6)) | EXT2_MIXMODE_CH1);//input channel 1 select(input channel 2 off) } static void init_wm8976(void) { uda1341_volume = 57; uda1341_boost = 0; //声音默认值 wm8976_write_reg(0,0); //复位 wm8976_write_reg(0x3, 0x6f); wm8976_write_reg(0x1, 0x1f);//biasen,BUFIOEN.VMIDSEL=11b wm8976_write_reg(0x2, 0x185);//ROUT1EN LOUT1EN, inpu PGA enable ,ADC enable wm8976_write_reg(0x6, 0x0);//SYSCLK=MCLK wm8976_write_reg(0x4, 0x10);//16bit wm8976_write_reg(0x2B,0x10);//BTL OUTPUT wm8976_write_reg(0x9, 0x50);//Jack detect enable wm8976_write_reg(0xD, 0x21);//Jack detect wm8976_write_reg(0x7, 0x01);//Jack detect } static void init_s3c2410_iis_bus(void){ __raw_writel(0, iis_base + S3C2410_IISPSR); __raw_writel(0, iis_base + S3C2410_IISCON); __raw_writel(0, iis_base + S3C2410_IISMOD); __raw_writel(0, iis_base + S3C2410_IISFCON); clk_disable(iis_clock); } static void init_s3c2410_iis_bus_rx(void){ unsigned int iiscon, iismod, iisfcon; char *dstr; //Kill everything... __raw_writel(0, iis_base + S3C2410_IISPSR); __raw_writel(0, iis_base + S3C2410_IISCON); __raw_writel(0, iis_base + S3C2410_IISMOD); __raw_writel(0, iis_base + S3C2410_IISFCON); clk_enable(iis_clock); iiscon = iismod = iisfcon = 0; //Setup basic stuff iiscon |= S3C2410_IISCON_PSCEN; // Enable prescaler iiscon |= S3C2410_IISCON_IISEN; // Enable interface // iismod |= S3C2410_IISMOD_MASTER; // Set interface to Master Mode iismod |= S3C2410_IISMOD_LR_LLOW; // Low for left channel iismod |= S3C2410_IISMOD_MSB; // IIS format iismod |= S3C2410_IISMOD_16BIT; // Serial data bit/channel is 16 bit iismod |= S3C2410_IISMOD_384FS; // Master clock freq = 384 fs iismod |= S3C2410_IISMOD_32FS; // 32 fs iisfcon |= S3C2410_IISFCON_RXDMA; //Set RX FIFO acces mode to DMA iisfcon |= S3C2410_IISFCON_TXDMA; //Set RX FIFO acces mode to DMA iiscon |= S3C2410_IISCON_RXDMAEN; //Enable RX DMA service request iiscon |= S3C2410_IISCON_TXIDLE; //Set TX channel idle iismod |= S3C2410_IISMOD_RXMODE; //Set RX Mode iisfcon |= S3C2410_IISFCON_RXENABLE; //Enable RX Fifo dstr="RX"; //setup the prescaler audio_set_dsp_speed(audio_rate); //iiscon has to be set last - it enables the interface __raw_writel(iismod, iis_base + S3C2410_IISMOD); __raw_writel(iisfcon, iis_base + S3C2410_IISFCON); __raw_writel(iiscon, iis_base + S3C2410_IISCON); } static void init_s3c2410_iis_bus_tx(void) { unsigned int iiscon, iismod, iisfcon; char *dstr; //Kill everything... __raw_writel(0, iis_base + S3C2410_IISPSR); __raw_writel(0, iis_base + S3C2410_IISCON); __raw_writel(0, iis_base + S3C2410_IISMOD); __raw_writel(0, iis_base + S3C2410_IISFCON); clk_enable(iis_clock); iiscon = iismod = iisfcon = 0; //Setup basic stuff iiscon |= S3C2410_IISCON_PSCEN; // Enable prescaler iiscon |= S3C2410_IISCON_IISEN; // Enable interface // iismod |= S3C2410_IISMOD_MASTER; // Set interface to Master Mode iismod |= S3C2410_IISMOD_LR_LLOW; // Low for left channel iismod |= S3C2410_IISMOD_MSB; // MSB format iismod |= S3C2410_IISMOD_16BIT; // Serial data bit/channel is 16 bit iismod |= S3C2410_IISMOD_384FS; // Master clock freq = 384 fs iismod |= S3C2410_IISMOD_32FS; // 32 fs iisfcon|= S3C2410_IISFCON_RXDMA; //Set RX FIFO acces mode to DMA iisfcon|= S3C2410_IISFCON_TXDMA; //Set TX FIFO acces mode to DMA iiscon |= S3C2410_IISCON_TXDMAEN; //Enable TX DMA service request iiscon |= S3C2410_IISCON_RXIDLE; //Set RX channel idle iismod |= S3C2410_IISMOD_TXMODE; //Set TX Mode iisfcon|= S3C2410_IISFCON_TXENABLE; //Enable TX Fifo dstr="TX"; //setup the prescaler audio_set_dsp_speed(audio_rate); //iiscon has to be set last - it enables the interface __raw_writel(iismod, iis_base + S3C2410_IISMOD); __raw_writel(iisfcon, iis_base + S3C2410_IISFCON); __raw_writel(iiscon, iis_base + S3C2410_IISCON); } static int __init audio_init_dma(audio_stream_t * s, char *desc) { int ret ; enum s3c2410_dmasrc source; int hwcfg; unsigned long devaddr; dmach_t channel; int dcon; unsigned int flags = 0; if(s->dma_ch == DMACH_I2S_OUT){ channel = DMACH_I2S_OUT; source = S3C2410_DMASRC_MEM; hwcfg = BUF_ON_APB; devaddr = 0x55000010; dcon = S3C2410_DCON_HANDSHAKE|S3C2410_DCON_SYNC_PCLK|S3C2410_DCON_INTREQ|S3C2410_DCON_TSZUNIT|S3C2410_DCON_SSERVE|S3C2410_DCON_CH2_I2SSDO|S3C2410_DCON_HWTRIG; // VAL: 0xa0800000; flags = S3C2410_DMAF_AUTOSTART; ret = s3c2410_dma_request(s->dma_ch, &s3c2410iis_dma_out, NULL); s3c2410_dma_devconfig(channel, source, hwcfg, devaddr); s3c2410_dma_config(channel, 2, dcon); s3c2410_dma_set_buffdone_fn(channel, audio_dmaout_done_callback); s3c2410_dma_setflags(channel, flags); s->dma_ok = 1; return ret; } else if(s->dma_ch == DMACH_I2S_IN){ channel = DMACH_I2S_IN; source = S3C2410_DMASRC_HW; hwcfg = BUF_ON_APB; devaddr = 0x55000010; dcon = S3C2410_DCON_HANDSHAKE|S3C2410_DCON_SYNC_PCLK|S3C2410_DCON_INTREQ|S3C2410_DCON_TSZUNIT|S3C2410_DCON_SSERVE|S3C2410_DCON_CH1_I2SSDI|S3C2410_DCON_HWTRIG; // VAL: 0xa2800000; flags = S3C2410_DMAF_AUTOSTART; ret = s3c2410_dma_request(s->dma_ch, &s3c2410iis_dma_in, NULL); s3c2410_dma_devconfig(channel, source, hwcfg, devaddr); s3c2410_dma_config(channel, 2, dcon); s3c2410_dma_set_buffdone_fn(channel, audio_dmain_done_callback); s3c2410_dma_setflags(channel, flags); s->dma_ok =1; return ret ; } else return 1; } static int audio_clear_dma(audio_stream_t * s, struct s3c2410_dma_client *client) { s3c2410_dma_set_buffdone_fn(s->dma_ch, NULL); s3c2410_dma_free(s->dma_ch, client); return 0; } static int s3c2410iis_probe(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct resource *res; unsigned long flags; printk ("s3c2410iis_probe... "); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (res == NULL) { printk(KERN_INFO PFX "failed to get memory region resouce "); return -ENOENT; } iis_base = (void *)S3C24XX_VA_IIS ; if (iis_base == 0) { printk(KERN_INFO PFX "failed to ioremap() region "); return -EINVAL; } iis_clock = clk_get(dev, "iis"); if (iis_clock == NULL) { printk(KERN_INFO PFX "failed to find clock source "); return -ENOENT; } clk_enable(iis_clock); //使能IIS控制器时钟 local_irq_save(flags); /* GPB 4: L3CLOCK, OUTPUT */ s3c2410_gpio_cfgpin(S3C2410_GPB4, S3C2410_GPB4_OUTP); // L3CLOCK s3c2410_gpio_pullup(S3C2410_GPB4,1); /* GPB 3: L3DATA, OUTPUT */ s3c2410_gpio_cfgpin(S3C2410_GPB3,S3C2410_GPB3_OUTP); // L3DATA /* GPB 2: L3MODE, OUTPUT */ s3c2410_gpio_cfgpin(S3C2410_GPB2,S3C2410_GPB2_OUTP); // L3MODE s3c2410_gpio_pullup(S3C2410_GPB2,1); /* GPE 3: I2SSDI */ s3c2410_gpio_cfgpin(S3C2410_GPE3,S3C2410_GPE3_I2SSDI); // I2SSDI s3c2410_gpio_pullup(S3C2410_GPE3,0); /* GPE 0: I2SLRCK */ s3c2410_gpio_cfgpin(S3C2410_GPE0,S3C2410_GPE0_I2SLRCK); // I2SLRCK s3c2410_gpio_pullup(S3C2410_GPE0,0); /* GPE 1: I2SSCLK */ s3c2410_gpio_cfgpin(S3C2410_GPE1,S3C2410_GPE1_I2SSCLK); // I2SSCLK IIS数据传输时钟 s3c2410_gpio_pullup(S3C2410_GPE1,0); /* GPE 2: CDCLK */ s3c2410_gpio_cfgpin(S3C2410_GPE2,S3C2410_GPE2_CDCLK); // CDCLK wm8976芯片工作时钟 s3c2410_gpio_pullup(S3C2410_GPE2,0); /* GPE 4: I2SSDO */ s3c2410_gpio_cfgpin(S3C2410_GPE4,S3C2410_GPE4_I2SSDO); // I2SSDO s3c2410_gpio_pullup(S3C2410_GPE4,0); local_irq_restore(flags); init_s3c2410_iis_bus(); //设置IIS控制器 init_wm8976(); //使用L3接口初始化 wm8976 芯片 output_stream.dma_ch = DMACH_I2S_OUT; // 设置DMA通道，用于播放 if (audio_init_dma(&output_stream, "UDA1341 out")) { audio_clear_dma(&output_stream,&s3c2410iis_dma_out); printk( KERN_WARNING AUDIO_NAME_VERBOSE ": unable to get DMA channels " ); return -EBUSY; } input_stream.dma_ch = DMACH_I2S_IN; // 设置DMA通道，用于录音 if (audio_init_dma(&input_stream, "UDA1341 in")) { audio_clear_dma(&input_stream,&s3c2410iis_dma_in); printk( KERN_WARNING AUDIO_NAME_VERBOSE ": unable to get DMA channels " ); return -EBUSY; } audio_dev_dsp = register_sound_dsp(&smdk2410_audio_fops, -1); //注册字符设备 dsp /dev/dsp 播音/录音 audio_dev_mixer = register_sound_mixer(&smdk2410_mixer_fops, -1); //注册字符设备 mixer /dev/mixer 音量 printk(AUDIO_NAME_VERBOSE " initialized "); return 0; } static int s3c2410iis_remove(struct device *dev) { unregister_sound_dsp(audio_dev_dsp); unregister_sound_mixer(audio_dev_mixer); audio_clear_dma(&output_stream,&s3c2410iis_dma_out); audio_clear_dma(&input_stream,&s3c2410iis_dma_in); /* input */ printk(AUDIO_NAME_VERBOSE " unloaded "); return 0; } extern struct bus_type platform_bus_type; static struct device_driver s3c2410iis_driver = { .name = "s3c2410-iis", .bus = &platform_bus_type, .probe = s3c2410iis_probe, .remove = s3c2410iis_remove, }; static int __init s3c2410_uda1341_init(void) { memzero(&input_stream, sizeof(audio_stream_t)); memzero(&output_stream, sizeof(audio_stream_t)); return driver_register(&s3c2410iis_driver); } static void __exit s3c2410_uda1341_exit(void) { driver_unregister(&s3c2410iis_driver); } module_init(s3c2410_uda1341_init); module_exit(s3c2410_uda1341_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("superlp<xinshengtaier@eyou.com>"); MODULE_DESCRIPTION("S3C2410 uda1341 sound driver");