/* * Copyright (c) by Jaroslav Kysela * Routines for control of AD1848/AD1847/CS4248 * * * 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 * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #define SNDRV_MAIN_OBJECT_FILE #include #include #include #include #include #include #include #include #include #include #include #include MODULE_AUTHOR("Jaroslav Kysela "); MODULE_DESCRIPTION("Routines for control of AD1848/AD1847/CS4248"); MODULE_LICENSE("GPL"); #if 0 #define SNDRV_DEBUG_MCE #endif /* * Some variables */ static unsigned char freq_bits[14] = { /* 5510 */ 0x00 | AD1848_XTAL2, /* 6620 */ 0x0E | AD1848_XTAL2, /* 8000 */ 0x00 | AD1848_XTAL1, /* 9600 */ 0x0E | AD1848_XTAL1, /* 11025 */ 0x02 | AD1848_XTAL2, /* 16000 */ 0x02 | AD1848_XTAL1, /* 18900 */ 0x04 | AD1848_XTAL2, /* 22050 */ 0x06 | AD1848_XTAL2, /* 27042 */ 0x04 | AD1848_XTAL1, /* 32000 */ 0x06 | AD1848_XTAL1, /* 33075 */ 0x0C | AD1848_XTAL2, /* 37800 */ 0x08 | AD1848_XTAL2, /* 44100 */ 0x0A | AD1848_XTAL2, /* 48000 */ 0x0C | AD1848_XTAL1 }; static unsigned int rates[14] = { 5510, 6620, 8000, 9600, 11025, 16000, 18900, 22050, 27042, 32000, 33075, 37800, 44100, 48000 }; static struct snd_pcm_hw_constraint_list hw_constraints_rates = { .count = 14, .list = rates, .mask = 0, }; static unsigned char snd_ad1848_original_image[16] = { 0x00, /* 00 - lic */ 0x00, /* 01 - ric */ 0x9f, /* 02 - la1ic */ 0x9f, /* 03 - ra1ic */ 0x9f, /* 04 - la2ic */ 0x9f, /* 05 - ra2ic */ 0xbf, /* 06 - loc */ 0xbf, /* 07 - roc */ 0x20, /* 08 - dfr */ AD1848_AUTOCALIB, /* 09 - ic */ 0x00, /* 0a - pc */ 0x00, /* 0b - ti */ 0x00, /* 0c - mi */ 0x00, /* 0d - lbc */ 0x00, /* 0e - dru */ 0x00, /* 0f - drl */ }; /* * Basic I/O functions */ void snd_ad1848_out(struct snd_ad1848 *chip, unsigned char reg, unsigned char value) { int timeout; for (timeout = 250; timeout > 0 && (inb(AD1848P(chip, REGSEL)) & AD1848_INIT); timeout--) udelay(100); #ifdef CONFIG_SND_DEBUG if (inb(AD1848P(chip, REGSEL)) & AD1848_INIT) snd_printk(KERN_WARNING "auto calibration time out - reg = 0x%x, value = 0x%x\n", reg, value); #endif outb(chip->mce_bit | reg, AD1848P(chip, REGSEL)); outb(chip->image[reg] = value, AD1848P(chip, REG)); mb(); #if 0 printk("codec out - reg 0x%x = 0x%x\n", chip->mce_bit | reg, value); #endif } static void snd_ad1848_dout(struct snd_ad1848 *chip, unsigned char reg, unsigned char value) { int timeout; for (timeout = 250; timeout > 0 && (inb(AD1848P(chip, REGSEL)) & AD1848_INIT); timeout--) udelay(100); outb(chip->mce_bit | reg, AD1848P(chip, REGSEL)); outb(value, AD1848P(chip, REG)); mb(); } static unsigned char snd_ad1848_in(struct snd_ad1848 *chip, unsigned char reg) { int timeout; for (timeout = 250; timeout > 0 && (inb(AD1848P(chip, REGSEL)) & AD1848_INIT); timeout--) udelay(100); #ifdef CONFIG_SND_DEBUG if (inb(AD1848P(chip, REGSEL)) & AD1848_INIT) snd_printk(KERN_WARNING "auto calibration time out - reg = 0x%x\n", reg); #endif outb(chip->mce_bit | reg, AD1848P(chip, REGSEL)); mb(); return inb(AD1848P(chip, REG)); } #if 0 static void snd_ad1848_debug(struct snd_ad1848 *chip) { printk("AD1848 REGS: INDEX = 0x%02x ", inb(AD1848P(chip, REGSEL))); printk(" STATUS = 0x%02x\n", inb(AD1848P(chip, STATUS))); printk(" 0x00: left input = 0x%02x ", snd_ad1848_in(chip, 0x00)); printk(" 0x08: playback format = 0x%02x\n", snd_ad1848_in(chip, 0x08)); printk(" 0x01: right input = 0x%02x ", snd_ad1848_in(chip, 0x01)); printk(" 0x09: iface (CFIG 1) = 0x%02x\n", snd_ad1848_in(chip, 0x09)); printk(" 0x02: AUXA left = 0x%02x ", snd_ad1848_in(chip, 0x02)); printk(" 0x0a: pin control = 0x%02x\n", snd_ad1848_in(chip, 0x0a)); printk(" 0x03: AUXA right = 0x%02x ", snd_ad1848_in(chip, 0x03)); printk(" 0x0b: init & status = 0x%02x\n", snd_ad1848_in(chip, 0x0b)); printk(" 0x04: AUXB left = 0x%02x ", snd_ad1848_in(chip, 0x04)); printk(" 0x0c: revision & mode = 0x%02x\n", snd_ad1848_in(chip, 0x0c)); printk(" 0x05: AUXB right = 0x%02x ", snd_ad1848_in(chip, 0x05)); printk(" 0x0d: loopback = 0x%02x\n", snd_ad1848_in(chip, 0x0d)); printk(" 0x06: left output = 0x%02x ", snd_ad1848_in(chip, 0x06)); printk(" 0x0e: data upr count = 0x%02x\n", snd_ad1848_in(chip, 0x0e)); printk(" 0x07: right output = 0x%02x ", snd_ad1848_in(chip, 0x07)); printk(" 0x0f: data lwr count = 0x%02x\n", snd_ad1848_in(chip, 0x0f)); } #endif /* * AD1848 detection / MCE routines */ static void snd_ad1848_mce_up(struct snd_ad1848 *chip) { unsigned long flags; int timeout; for (timeout = 250; timeout > 0 && (inb(AD1848P(chip, REGSEL)) & AD1848_INIT); timeout--) udelay(100); #ifdef CONFIG_SND_DEBUG if (inb(AD1848P(chip, REGSEL)) & AD1848_INIT) snd_printk(KERN_WARNING "mce_up - auto calibration time out (0)\n"); #endif spin_lock_irqsave(&chip->reg_lock, flags); chip->mce_bit |= AD1848_MCE; timeout = inb(AD1848P(chip, REGSEL)); if (timeout == 0x80) snd_printk(KERN_WARNING "mce_up [0x%lx]: serious init problem - codec still busy\n", chip->port); if (!(timeout & AD1848_MCE)) outb(chip->mce_bit | (timeout & 0x1f), AD1848P(chip, REGSEL)); spin_unlock_irqrestore(&chip->reg_lock, flags); } static void snd_ad1848_mce_down(struct snd_ad1848 *chip) { unsigned long flags; int timeout; signed long time; spin_lock_irqsave(&chip->reg_lock, flags); for (timeout = 5; timeout > 0; timeout--) inb(AD1848P(chip, REGSEL)); /* end of cleanup sequence */ for (timeout = 12000; timeout > 0 && (inb(AD1848P(chip, REGSEL)) & AD1848_INIT); timeout--) udelay(100); #if 0 printk("(1) timeout = %i\n", timeout); #endif #ifdef CONFIG_SND_DEBUG if (inb(AD1848P(chip, REGSEL)) & AD1848_INIT) snd_printk(KERN_WARNING "mce_down [0x%lx] - auto calibration time out (0)\n", AD1848P(chip, REGSEL)); #endif chip->mce_bit &= ~AD1848_MCE; timeout = inb(AD1848P(chip, REGSEL)); outb(chip->mce_bit | (timeout & 0x1f), AD1848P(chip, REGSEL)); if (timeout == 0x80) snd_printk(KERN_WARNING "mce_down [0x%lx]: serious init problem - codec still busy\n", chip->port); if ((timeout & AD1848_MCE) == 0) { spin_unlock_irqrestore(&chip->reg_lock, flags); return; } /* calibration process */ for (timeout = 500; timeout > 0 && (snd_ad1848_in(chip, AD1848_TEST_INIT) & AD1848_CALIB_IN_PROGRESS) == 0; timeout--); if ((snd_ad1848_in(chip, AD1848_TEST_INIT) & AD1848_CALIB_IN_PROGRESS) == 0) { snd_printd("mce_down - auto calibration time out (1)\n"); spin_unlock_irqrestore(&chip->reg_lock, flags); return; } #if 0 printk("(2) timeout = %i, jiffies = %li\n", timeout, jiffies); #endif time = HZ / 4; while (snd_ad1848_in(chip, AD1848_TEST_INIT) & AD1848_CALIB_IN_PROGRESS) { spin_unlock_irqrestore(&chip->reg_lock, flags); if (time <= 0) { snd_printk(KERN_ERR "mce_down - auto calibration time out (2)\n"); return; } time = schedule_timeout_interruptible(time); spin_lock_irqsave(&chip->reg_lock, flags); } #if 0 printk("(3) jiffies = %li\n", jiffies); #endif time = HZ / 10; while (inb(AD1848P(chip, REGSEL)) & AD1848_INIT) { spin_unlock_irqrestore(&chip->reg_lock, flags); if (time <= 0) { snd_printk(KERN_ERR "mce_down - auto calibration time out (3)\n"); return; } time = schedule_timeout_interruptible(time); spin_lock_irqsave(&chip->reg_lock, flags); } spin_unlock_irqrestore(&chip->reg_lock, flags); #if 0 printk("(4) jiffies = %li\n", jiffies); snd_printk("mce_down - exit = 0x%x\n", inb(AD1848P(chip, REGSEL))); #endif } static unsigned int snd_ad1848_get_count(unsigned char format, unsigned int size) { switch (format & 0xe0) { case AD1848_LINEAR_16: size >>= 1; break; } if (format & AD1848_STEREO) size >>= 1; return size; } static int snd_ad1848_trigger(struct snd_ad1848 *chip, unsigned char what, int channel, int cmd) { int result = 0; #if 0 printk("codec trigger!!! - what = %i, enable = %i, status = 0x%x\n", what, enable, inb(AD1848P(card, STATUS))); #endif spin_lock(&chip->reg_lock); if (cmd == SNDRV_PCM_TRIGGER_START) { if (chip->image[AD1848_IFACE_CTRL] & what) { spin_unlock(&chip->reg_lock); return 0; } snd_ad1848_out(chip, AD1848_IFACE_CTRL, chip->image[AD1848_IFACE_CTRL] |= what); chip->mode |= AD1848_MODE_RUNNING; } else if (cmd == SNDRV_PCM_TRIGGER_STOP) { if (!(chip->image[AD1848_IFACE_CTRL] & what)) { spin_unlock(&chip->reg_lock); return 0; } snd_ad1848_out(chip, AD1848_IFACE_CTRL, chip->image[AD1848_IFACE_CTRL] &= ~what); chip->mode &= ~AD1848_MODE_RUNNING; } else { result = -EINVAL; } spin_unlock(&chip->reg_lock); return result; } /* * CODEC I/O */ static unsigned char snd_ad1848_get_rate(unsigned int rate) { int i; for (i = 0; i < 14; i++) if (rate == rates[i]) return freq_bits[i]; snd_BUG(); return freq_bits[13]; } static int snd_ad1848_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg) { return snd_pcm_lib_ioctl(substream, cmd, arg); } static unsigned char snd_ad1848_get_format(int format, int channels) { unsigned char rformat; rformat = AD1848_LINEAR_8; switch (format) { case SNDRV_PCM_FORMAT_A_LAW: rformat = AD1848_ALAW_8; break; case SNDRV_PCM_FORMAT_MU_LAW: rformat = AD1848_ULAW_8; break; case SNDRV_PCM_FORMAT_S16_LE: rformat = AD1848_LINEAR_16; break; } if (channels > 1) rformat |= AD1848_STEREO; #if 0 snd_printk("get_format: 0x%x (mode=0x%x)\n", format, mode); #endif return rformat; } static void snd_ad1848_calibrate_mute(struct snd_ad1848 *chip, int mute) { unsigned long flags; mute = mute ? 1 : 0; spin_lock_irqsave(&chip->reg_lock, flags); if (chip->calibrate_mute == mute) { spin_unlock_irqrestore(&chip->reg_lock, flags); return; } if (!mute) { snd_ad1848_dout(chip, AD1848_LEFT_INPUT, chip->image[AD1848_LEFT_INPUT]); snd_ad1848_dout(chip, AD1848_RIGHT_INPUT, chip->image[AD1848_RIGHT_INPUT]); } snd_ad1848_dout(chip, AD1848_AUX1_LEFT_INPUT, mute ? 0x80 : chip->image[AD1848_AUX1_LEFT_INPUT]); snd_ad1848_dout(chip, AD1848_AUX1_RIGHT_INPUT, mute ? 0x80 : chip->image[AD1848_AUX1_RIGHT_INPUT]); snd_ad1848_dout(chip, AD1848_AUX2_LEFT_INPUT, mute ? 0x80 : chip->image[AD1848_AUX2_LEFT_INPUT]); snd_ad1848_dout(chip, AD1848_AUX2_RIGHT_INPUT, mute ? 0x80 : chip->image[AD1848_AUX2_RIGHT_INPUT]); snd_ad1848_dout(chip, AD1848_LEFT_OUTPUT, mute ? 0x80 : chip->image[AD1848_LEFT_OUTPUT]); snd_ad1848_dout(chip, AD1848_RIGHT_OUTPUT, mute ? 0x80 : chip->image[AD1848_RIGHT_OUTPUT]); chip->calibrate_mute = mute; spin_unlock_irqrestore(&chip->reg_lock, flags); } static void snd_ad1848_set_data_format(struct snd_ad1848 *chip, struct snd_pcm_hw_params *hw_params) { if (hw_params == NULL) { chip->image[AD1848_DATA_FORMAT] = 0x20; } else { chip->image[AD1848_DATA_FORMAT] = snd_ad1848_get_format(params_format(hw_params), params_channels(hw_params)) | snd_ad1848_get_rate(params_rate(hw_params)); } // snd_printk(">>> pmode = 0x%x, dfr = 0x%x\n", pstr->mode, chip->image[AD1848_DATA_FORMAT]); } static int snd_ad1848_open(struct snd_ad1848 *chip, unsigned int mode) { unsigned long flags; mutex_lock(&chip->open_mutex); if (chip->mode & AD1848_MODE_OPEN) { mutex_unlock(&chip->open_mutex); return -EAGAIN; } snd_ad1848_mce_down(chip); #ifdef SNDRV_DEBUG_MCE snd_printk("open: (1)\n"); #endif snd_ad1848_mce_up(chip); spin_lock_irqsave(&chip->reg_lock, flags); chip->image[AD1848_IFACE_CTRL] &= ~(AD1848_PLAYBACK_ENABLE | AD1848_PLAYBACK_PIO | AD1848_CAPTURE_ENABLE | AD1848_CAPTURE_PIO | AD1848_CALIB_MODE); chip->image[AD1848_IFACE_CTRL] |= AD1848_AUTOCALIB; snd_ad1848_out(chip, AD1848_IFACE_CTRL, chip->image[AD1848_IFACE_CTRL]); spin_unlock_irqrestore(&chip->reg_lock, flags); snd_ad1848_mce_down(chip); #ifdef SNDRV_DEBUG_MCE snd_printk("open: (2)\n"); #endif snd_ad1848_set_data_format(chip, NULL); snd_ad1848_mce_up(chip); spin_lock_irqsave(&chip->reg_lock, flags); snd_ad1848_out(chip, AD1848_DATA_FORMAT, chip->image[AD1848_DATA_FORMAT]); spin_unlock_irqrestore(&chip->reg_lock, flags); snd_ad1848_mce_down(chip); #ifdef SNDRV_DEBUG_MCE snd_printk("open: (3)\n"); #endif /* ok. now enable and ack CODEC IRQ */ spin_lock_irqsave(&chip->reg_lock, flags); outb(0, AD1848P(chip, STATUS)); /* clear IRQ */ outb(0, AD1848P(chip, STATUS)); /* clear IRQ */ chip->image[AD1848_PIN_CTRL] |= AD1848_IRQ_ENABLE; snd_ad1848_out(chip, AD1848_PIN_CTRL, chip->image[AD1848_PIN_CTRL]); spin_unlock_irqrestore(&chip->reg_lock, flags); chip->mode = mode; mutex_unlock(&chip->open_mutex); return 0; } static void snd_ad1848_close(struct snd_ad1848 *chip) { unsigned long flags; mutex_lock(&chip->open_mutex); if (!chip->mode) { mutex_unlock(&chip->open_mutex); return; } /* disable IRQ */ spin_lock_irqsave(&chip->reg_lock, flags); outb(0, AD1848P(chip, STATUS)); /* clear IRQ */ outb(0, AD1848P(chip, STATUS)); /* clear IRQ */ chip->image[AD1848_PIN_CTRL] &= ~AD1848_IRQ_ENABLE; snd_ad1848_out(chip, AD1848_PIN_CTRL, chip->image[AD1848_PIN_CTRL]); spin_unlock_irqrestore(&chip->reg_lock, flags); /* now disable capture & playback */ snd_ad1848_mce_up(chip); spin_lock_irqsave(&chip->reg_lock, flags); chip->image[AD1848_IFACE_CTRL] &= ~(AD1848_PLAYBACK_ENABLE | AD1848_PLAYBACK_PIO | AD1848_CAPTURE_ENABLE | AD1848_CAPTURE_PIO); snd_ad1848_out(chip, AD1848_IFACE_CTRL, chip->image[AD1848_IFACE_CTRL]); spin_unlock_irqrestore(&chip->reg_lock, flags); snd_ad1848_mce_down(chip); /* clear IRQ again */ spin_lock_irqsave(&chip->reg_lock, flags); outb(0, AD1848P(chip, STATUS)); /* clear IRQ */ outb(0, AD1848P(chip, STATUS)); /* clear IRQ */ spin_unlock_irqrestore(&chip->reg_lock, flags); chip->mode = 0; mutex_unlock(&chip->open_mutex); } /* * ok.. exported functions.. */ static int snd_ad1848_playback_trigger(struct snd_pcm_substream *substream, int cmd) { struct snd_ad1848 *chip = snd_pcm_substream_chip(substream); return snd_ad1848_trigger(chip, AD1848_PLAYBACK_ENABLE, SNDRV_PCM_STREAM_PLAYBACK, cmd); } static int snd_ad1848_capture_trigger(struct snd_pcm_substream *substream, int cmd) { struct snd_ad1848 *chip = snd_pcm_substream_chip(substream); return snd_ad1848_trigger(chip, AD1848_CAPTURE_ENABLE, SNDRV_PCM_STREAM_CAPTURE, cmd); } static int snd_ad1848_playback_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params) { struct snd_ad1848 *chip = snd_pcm_substream_chip(substream); unsigned long flags; int err; if ((err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0) return err; snd_ad1848_calibrate_mute(chip, 1); snd_ad1848_set_data_format(chip, hw_params); snd_ad1848_mce_up(chip); spin_lock_irqsave(&chip->reg_lock, flags); snd_ad1848_out(chip, AD1848_DATA_FORMAT, chip->image[AD1848_DATA_FORMAT]); spin_unlock_irqrestore(&chip->reg_lock, flags); snd_ad1848_mce_down(chip); snd_ad1848_calibrate_mute(chip, 0); return 0; } static int snd_ad1848_playback_hw_free(struct snd_pcm_substream *substream) { return snd_pcm_lib_free_pages(substream); } static int snd_ad1848_playback_prepare(struct snd_pcm_substream *substream) { struct snd_ad1848 *chip = snd_pcm_substream_chip(substream); struct snd_pcm_runtime *runtime = substream->runtime; unsigned long flags; unsigned int size = snd_pcm_lib_buffer_bytes(substream); unsigned int count = snd_pcm_lib_period_bytes(substream); chip->dma_size = size; chip->image[AD1848_IFACE_CTRL] &= ~(AD1848_PLAYBACK_ENABLE | AD1848_PLAYBACK_PIO); snd_dma_program(chip->dma, runtime->dma_addr, size, DMA_MODE_WRITE | DMA_AUTOINIT); count = snd_ad1848_get_count(chip->image[AD1848_DATA_FORMAT], count) - 1; spin_lock_irqsave(&chip->reg_lock, flags); snd_ad1848_out(chip, AD1848_DATA_LWR_CNT, (unsigned char) count); snd_ad1848_out(chip, AD1848_DATA_UPR_CNT, (unsigned char) (count >> 8)); spin_unlock_irqrestore(&chip->reg_lock, flags); return 0; } static int snd_ad1848_capture_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params) { struct snd_ad1848 *chip = snd_pcm_substream_chip(substream); unsigned long flags; int err; if ((err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0) return err; snd_ad1848_calibrate_mute(chip, 1); snd_ad1848_set_data_format(chip, hw_params); snd_ad1848_mce_up(chip); spin_lock_irqsave(&chip->reg_lock, flags); snd_ad1848_out(chip, AD1848_DATA_FORMAT, chip->image[AD1848_DATA_FORMAT]); spin_unlock_irqrestore(&chip->reg_lock, flags); snd_ad1848_mce_down(chip); snd_ad1848_calibrate_mute(chip, 0); return 0; } static int snd_ad1848_capture_hw_free(struct snd_pcm_substream *substream) { return snd_pcm_lib_free_pages(substream); } static int snd_ad1848_capture_prepare(struct snd_pcm_substream *substream) { struct snd_ad1848 *chip = snd_pcm_substream_chip(substream); struct snd_pcm_runtime *runtime = substream->runtime; unsigned long flags; unsigned int size = snd_pcm_lib_buffer_bytes(substream); unsigned int count = snd_pcm_lib_period_bytes(substream); chip->dma_size = size; chip->image[AD1848_IFACE_CTRL] &= ~(AD1848_CAPTURE_ENABLE | AD1848_CAPTURE_PIO); snd_dma_program(chip->dma, runtime->dma_addr, size, DMA_MODE_READ | DMA_AUTOINIT); count = snd_ad1848_get_count(chip->image[AD1848_DATA_FORMAT], count) - 1; spin_lock_irqsave(&chip->reg_lock, flags); snd_ad1848_out(chip, AD1848_DATA_LWR_CNT, (unsigned char) count); snd_ad1848_out(chip, AD1848_DATA_UPR_CNT, (unsigned char) (count >> 8)); spin_unlock_irqrestore(&chip->reg_lock, flags); return 0; } static irqreturn_t snd_ad1848_interrupt(int irq, void *dev_id, struct pt_regs *regs) { struct snd_ad1848 *chip = dev_id; if ((chip->mode & AD1848_MODE_PLAY) && chip->playback_substream && (chip->mode & AD1848_MODE_RUNNING)) snd_pcm_period_elapsed(chip->playback_substream); if ((chip->mode & AD1848_MODE_CAPTURE) && chip->capture_substream && (chip->mode & AD1848_MODE_RUNNING)) snd_pcm_period_elapsed(chip->capture_substream); outb(0, AD1848P(chip, STATUS)); /* clear global interrupt bit */ return IRQ_HANDLED; } static snd_pcm_uframes_t snd_ad1848_playback_pointer(struct snd_pcm_substream *substream) { struct snd_ad1848 *chip = snd_pcm_substream_chip(substream); size_t ptr; if (!(chip->image[AD1848_IFACE_CTRL] & AD1848_PLAYBACK_ENABLE)) return 0; ptr = snd_dma_pointer(chip->dma, chip->dma_size); return bytes_to_frames(substream->runtime, ptr); } static snd_pcm_uframes_t snd_ad1848_capture_pointer(struct snd_pcm_substream *substream) { struct snd_ad1848 *chip = snd_pcm_substream_chip(substream); size_t ptr; if (!(chip->image[AD1848_IFACE_CTRL] & AD1848_CAPTURE_ENABLE)) return 0; ptr = snd_dma_pointer(chip->dma, chip->dma_size); return bytes_to_frames(substream->runtime, ptr); } /* */ static void snd_ad1848_thinkpad_twiddle(struct snd_ad1848 *chip, int on) { int tmp; if (!chip->thinkpad_flag) return; outb(0x1c, AD1848_THINKPAD_CTL_PORT1); tmp = inb(AD1848_THINKPAD_CTL_PORT2); if (on) /* turn it on */ tmp |= AD1848_THINKPAD_CS4248_ENABLE_BIT; else /* turn it off */ tmp &= ~AD1848_THINKPAD_CS4248_ENABLE_BIT; outb(tmp, AD1848_THINKPAD_CTL_PORT2); } #ifdef CONFIG_PM static void snd_ad1848_suspend(struct snd_ad1848 *chip) { snd_pcm_suspend_all(chip->pcm); if (chip->thinkpad_flag) snd_ad1848_thinkpad_twiddle(chip, 0); } static void snd_ad1848_resume(struct snd_ad1848 *chip) { int i; if (chip->thinkpad_flag) snd_ad1848_thinkpad_twiddle(chip, 1); /* clear any pendings IRQ */ inb(AD1848P(chip, STATUS)); outb(0, AD1848P(chip, STATUS)); mb(); snd_ad1848_mce_down(chip); for (i = 0; i < 16; i++) snd_ad1848_out(chip, i, chip->image[i]); snd_ad1848_mce_up(chip); snd_ad1848_mce_down(chip); } #endif /* CONFIG_PM */ static int snd_ad1848_probe(struct snd_ad1848 * chip) { unsigned long flags; int i, id, rev, ad1847; unsigned char *ptr; #if 0 snd_ad1848_debug(chip); #endif id = ad1847 = 0; for (i = 0; i < 1000; i++) { mb(); if (inb(AD1848P(chip, REGSEL)) & AD1848_INIT) udelay(500); else { spin_lock_irqsave(&chip->reg_lock, flags); snd_ad1848_out(chip, AD1848_MISC_INFO, 0x00); snd_ad1848_out(chip, AD1848_LEFT_INPUT, 0xaa); snd_ad1848_out(chip, AD1848_RIGHT_INPUT, 0x45); rev = snd_ad1848_in(chip, AD1848_RIGHT_INPUT); if (rev == 0x65) { spin_unlock_irqrestore(&chip->reg_lock, flags); id = 1; ad1847 = 1; break; } if (snd_ad1848_in(chip, AD1848_LEFT_INPUT) == 0xaa && rev == 0x45) { spin_unlock_irqrestore(&chip->reg_lock, flags); id = 1; break; } spin_unlock_irqrestore(&chip->reg_lock, flags); } } if (id != 1) return -ENODEV; /* no valid device found */ if (chip->hardware == AD1848_HW_DETECT) { if (ad1847) { chip->hardware = AD1848_HW_AD1847; } else { chip->hardware = AD1848_HW_AD1848; rev = snd_ad1848_in(chip, AD1848_MISC_INFO); if (rev & 0x80) { chip->hardware = AD1848_HW_CS4248; } else if ((rev & 0x0f) == 0x0a) { snd_ad1848_out(chip, AD1848_MISC_INFO, 0x40); for (i = 0; i < 16; ++i) { if (snd_ad1848_in(chip, i) != snd_ad1848_in(chip, i + 16)) { chip->hardware = AD1848_HW_CMI8330; break; } } snd_ad1848_out(chip, AD1848_MISC_INFO, 0x00); } } } spin_lock_irqsave(&chip->reg_lock, flags); inb(AD1848P(chip, STATUS)); /* clear any pendings IRQ */ outb(0, AD1848P(chip, STATUS)); mb(); spin_unlock_irqrestore(&chip->reg_lock, flags); chip->image[AD1848_MISC_INFO] = 0x00; chip->image[AD1848_IFACE_CTRL] = (chip->image[AD1848_IFACE_CTRL] & ~AD1848_SINGLE_DMA) | AD1848_SINGLE_DMA; ptr = (unsigned char *) &chip->image; snd_ad1848_mce_down(chip); spin_lock_irqsave(&chip->reg_lock, flags); for (i = 0; i < 16; i++) /* ok.. fill all AD1848 registers */ snd_ad1848_out(chip, i, *ptr++); spin_unlock_irqrestore(&chip->reg_lock, flags); snd_ad1848_mce_up(chip); snd_ad1848_mce_down(chip); return 0; /* all things are ok.. */ } /* */ static struct snd_pcm_hardware snd_ad1848_playback = { .info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP_VALID), .formats = (SNDRV_PCM_FMTBIT_MU_LAW | SNDRV_PCM_FMTBIT_A_LAW | SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE), .rates = SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_8000_48000, .rate_min = 5510, .rate_max = 48000, .channels_min = 1, .channels_max = 2, .buffer_bytes_max = (128*1024), .period_bytes_min = 64, .period_bytes_max = (128*1024), .periods_min = 1, .periods_max = 1024, .fifo_size = 0, }; static struct snd_pcm_hardware snd_ad1848_capture = { .info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP_VALID), .formats = (SNDRV_PCM_FMTBIT_MU_LAW | SNDRV_PCM_FMTBIT_A_LAW | SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE), .rates = SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_8000_48000, .rate_min = 5510, .rate_max = 48000, .channels_min = 1, .channels_max = 2, .buffer_bytes_max = (128*1024), .period_bytes_min = 64, .period_bytes_max = (128*1024), .periods_min = 1, .periods_max = 1024, .fifo_size = 0, }; /* */ static int snd_ad1848_playback_open(struct snd_pcm_substream *substream) { struct snd_ad1848 *chip = snd_pcm_substream_chip(substream); struct snd_pcm_runtime *runtime = substream->runtime; int err; if ((err = snd_ad1848_open(chip, AD1848_MODE_PLAY)) < 0) return err; chip->playback_substream = substream; runtime->hw = snd_ad1848_playback; snd_pcm_limit_isa_dma_size(chip->dma, &runtime->hw.buffer_bytes_max); snd_pcm_limit_isa_dma_size(chip->dma, &runtime->hw.period_bytes_max); snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates); return 0; } static int snd_ad1848_capture_open(struct snd_pcm_substream *substream) { struct snd_ad1848 *chip = snd_pcm_substream_chip(substream); struct snd_pcm_runtime *runtime = substream->runtime; int err; if ((err = snd_ad1848_open(chip, AD1848_MODE_CAPTURE)) < 0) return err; chip->capture_substream = substream; runtime->hw = snd_ad1848_capture; snd_pcm_limit_isa_dma_size(chip->dma, &runtime->hw.buffer_bytes_max); snd_pcm_limit_isa_dma_size(chip->dma, &runtime->hw.period_bytes_max); snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates); return 0; } static int snd_ad1848_playback_close(struct snd_pcm_substream *substream) { struct snd_ad1848 *chip = snd_pcm_substream_chip(substream); chip->mode &= ~AD1848_MODE_PLAY; chip->playback_substream = NULL; snd_ad1848_close(chip); return 0; } static int snd_ad1848_capture_close(struct snd_pcm_substream *substream) { struct snd_ad1848 *chip = snd_pcm_substream_chip(substream); chip->mode &= ~AD1848_MODE_CAPTURE; chip->capture_substream = NULL; snd_ad1848_close(chip); return 0; } static int snd_ad1848_free(struct snd_ad1848 *chip) { release_and_free_resource(chip->res_port); if (chip->irq >= 0) free_irq(chip->irq, (void *) chip); if (chip->dma >= 0) { snd_dma_disable(chip->dma); free_dma(chip->dma); } kfree(chip); return 0; } static int snd_ad1848_dev_free(struct snd_device *device) { struct snd_ad1848 *chip = device->device_data; return snd_ad1848_free(chip); } static const char *snd_ad1848_chip_id(struct snd_ad1848 *chip) { switch (chip->hardware) { case AD1848_HW_AD1847: return "AD1847"; case AD1848_HW_AD1848: return "AD1848"; case AD1848_HW_CS4248: return "CS4248"; case AD1848_HW_CMI8330: return "CMI8330/C3D"; default: return "???"; } } int snd_ad1848_create(struct snd_card *card, unsigned long port, int irq, int dma, unsigned short hardware, struct snd_ad1848 ** rchip) { static struct snd_device_ops ops = { .dev_free = snd_ad1848_dev_free, }; struct snd_ad1848 *chip; int err; *rchip = NULL; chip = kzalloc(sizeof(*chip), GFP_KERNEL); if (chip == NULL) return -ENOMEM; spin_lock_init(&chip->reg_lock); mutex_init(&chip->open_mutex); chip->card = card; chip->port = port; chip->irq = -1; chip->dma = -1; chip->hardware = hardware; memcpy(&chip->image, &snd_ad1848_original_image, sizeof(snd_ad1848_original_image)); if ((chip->res_port = request_region(port, 4, "AD1848")) == NULL) { snd_printk(KERN_ERR "ad1848: can't grab port 0x%lx\n", port); snd_ad1848_free(chip); return -EBUSY; } if (request_irq(irq, snd_ad1848_interrupt, SA_INTERRUPT, "AD1848", (void *) chip)) { snd_printk(KERN_ERR "ad1848: can't grab IRQ %d\n", irq); snd_ad1848_free(chip); return -EBUSY; } chip->irq = irq; if (request_dma(dma, "AD1848")) { snd_printk(KERN_ERR "ad1848: can't grab DMA %d\n", dma); snd_ad1848_free(chip); return -EBUSY; } chip->dma = dma; if (hardware == AD1848_HW_THINKPAD) { chip->thinkpad_flag = 1; chip->hardware = AD1848_HW_DETECT; /* reset */ snd_ad1848_thinkpad_twiddle(chip, 1); } if (snd_ad1848_probe(chip) < 0) { snd_ad1848_free(chip); return -ENODEV; } /* Register device */ if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) { snd_ad1848_free(chip); return err; } #ifdef CONFIG_PM chip->suspend = snd_ad1848_suspend; chip->resume = snd_ad1848_resume; #endif *rchip = chip; return 0; } static struct snd_pcm_ops snd_ad1848_playback_ops = { .open = snd_ad1848_playback_open, .close = snd_ad1848_playback_close, .ioctl = snd_ad1848_ioctl, .hw_params = snd_ad1848_playback_hw_params, .hw_free = snd_ad1848_playback_hw_free, .prepare = snd_ad1848_playback_prepare, .trigger = snd_ad1848_playback_trigger, .pointer = snd_ad1848_playback_pointer, }; static struct snd_pcm_ops snd_ad1848_capture_ops = { .open = snd_ad1848_capture_open, .close = snd_ad1848_capture_close, .ioctl = snd_ad1848_ioctl, .hw_params = snd_ad1848_capture_hw_params, .hw_free = snd_ad1848_capture_hw_free, .prepare = snd_ad1848_capture_prepare, .trigger = snd_ad1848_capture_trigger, .pointer = snd_ad1848_capture_pointer, }; int snd_ad1848_pcm(struct snd_ad1848 *chip, int device, struct snd_pcm **rpcm) { struct snd_pcm *pcm; int err; if ((err = snd_pcm_new(chip->card, "AD1848", device, 1, 1, &pcm)) < 0) return err; snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_ad1848_playback_ops); snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_ad1848_capture_ops); pcm->private_data = chip; pcm->info_flags = SNDRV_PCM_INFO_HALF_DUPLEX; strcpy(pcm->name, snd_ad1848_chip_id(chip)); snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, snd_dma_isa_data(), 64*1024, chip->dma > 3 ? 128*1024 : 64*1024); chip->pcm = pcm; if (rpcm) *rpcm = pcm; return 0; } const struct snd_pcm_ops *snd_ad1848_get_pcm_ops(int direction) { return direction == SNDRV_PCM_STREAM_PLAYBACK ? &snd_ad1848_playback_ops : &snd_ad1848_capture_ops; } /* * MIXER part */ static int snd_ad1848_info_mux(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) { static char *texts[4] = { "Line", "Aux", "Mic", "Mix" }; uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED; uinfo->count = 2; uinfo->value.enumerated.items = 4; if (uinfo->value.enumerated.item > 3) uinfo->value.enumerated.item = 3; strcpy(uinfo->value.enumerated.name, texts[uinfo->value.enumerated.item]); return 0; } static int snd_ad1848_get_mux(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_ad1848 *chip = snd_kcontrol_chip(kcontrol); unsigned long flags; spin_lock_irqsave(&chip->reg_lock, flags); ucontrol->value.enumerated.item[0] = (chip->image[AD1848_LEFT_INPUT] & AD1848_MIXS_ALL) >> 6; ucontrol->value.enumerated.item[1] = (chip->image[AD1848_RIGHT_INPUT] & AD1848_MIXS_ALL) >> 6; spin_unlock_irqrestore(&chip->reg_lock, flags); return 0; } static int snd_ad1848_put_mux(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_ad1848 *chip = snd_kcontrol_chip(kcontrol); unsigned long flags; unsigned short left, right; int change; if (ucontrol->value.enumerated.item[0] > 3 || ucontrol->value.enumerated.item[1] > 3) return -EINVAL; left = ucontrol->value.enumerated.item[0] << 6; right = ucontrol->value.enumerated.item[1] << 6; spin_lock_irqsave(&chip->reg_lock, flags); left = (chip->image[AD1848_LEFT_INPUT] & ~AD1848_MIXS_ALL) | left; right = (chip->image[AD1848_RIGHT_INPUT] & ~AD1848_MIXS_ALL) | right; change = left != chip->image[AD1848_LEFT_INPUT] || right != chip->image[AD1848_RIGHT_INPUT]; snd_ad1848_out(chip, AD1848_LEFT_INPUT, left); snd_ad1848_out(chip, AD1848_RIGHT_INPUT, right); spin_unlock_irqrestore(&chip->reg_lock, flags); return change; } static int snd_ad1848_info_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) { int mask = (kcontrol->private_value >> 16) & 0xff; uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER; uinfo->count = 1; uinfo->value.integer.min = 0; uinfo->value.integer.max = mask; return 0; } static int snd_ad1848_get_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_ad1848 *chip = snd_kcontrol_chip(kcontrol); unsigned long flags; int reg = kcontrol->private_value & 0xff; int shift = (kcontrol->private_value >> 8) & 0xff; int mask = (kcontrol->private_value >> 16) & 0xff; int invert = (kcontrol->private_value >> 24) & 0xff; spin_lock_irqsave(&chip->reg_lock, flags); ucontrol->value.integer.value[0] = (chip->image[reg] >> shift) & mask; spin_unlock_irqrestore(&chip->reg_lock, flags); if (invert) ucontrol->value.integer.value[0] = mask - ucontrol->value.integer.value[0]; return 0; } static int snd_ad1848_put_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_ad1848 *chip = snd_kcontrol_chip(kcontrol); unsigned long flags; int reg = kcontrol->private_value & 0xff; int shift = (kcontrol->private_value >> 8) & 0xff; int mask = (kcontrol->private_value >> 16) & 0xff; int invert = (kcontrol->private_value >> 24) & 0xff; int change; unsigned short val; val = (ucontrol->value.integer.value[0] & mask); if (invert) val = mask - val; val <<= shift; spin_lock_irqsave(&chip->reg_lock, flags); val = (chip->image[reg] & ~(mask << shift)) | val; change = val != chip->image[reg]; snd_ad1848_out(chip, reg, val); spin_unlock_irqrestore(&chip->reg_lock, flags); return change; } static int snd_ad1848_info_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) { int mask = (kcontrol->private_value >> 24) & 0xff; uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER; uinfo->count = 2; uinfo->value.integer.min = 0; uinfo->value.integer.max = mask; return 0; } static int snd_ad1848_get_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_ad1848 *chip = snd_kcontrol_chip(kcontrol); unsigned long flags; int left_reg = kcontrol->private_value & 0xff; int right_reg = (kcontrol->private_value >> 8) & 0xff; int shift_left = (kcontrol->private_value >> 16) & 0x07; int shift_right = (kcontrol->private_value >> 19) & 0x07; int mask = (kcontrol->private_value >> 24) & 0xff; int invert = (kcontrol->private_value >> 22) & 1; spin_lock_irqsave(&chip->reg_lock, flags); ucontrol->value.integer.value[0] = (chip->image[left_reg] >> shift_left) & mask; ucontrol->value.integer.value[1] = (chip->image[right_reg] >> shift_right) & mask; spin_unlock_irqrestore(&chip->reg_lock, flags); if (invert) { ucontrol->value.integer.value[0] = mask - ucontrol->value.integer.value[0]; ucontrol->value.integer.value[1] = mask - ucontrol->value.integer.value[1]; } return 0; } static int snd_ad1848_put_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_ad1848 *chip = snd_kcontrol_chip(kcontrol); unsigned long flags; int left_reg = kcontrol->private_value & 0xff; int right_reg = (kcontrol->private_value >> 8) & 0xff; int shift_left = (kcontrol->private_value >> 16) & 0x07; int shift_right = (kcontrol->private_value >> 19) & 0x07; int mask = (kcontrol->private_value >> 24) & 0xff; int invert = (kcontrol->private_value >> 22) & 1; int change; unsigned short val1, val2; val1 = ucontrol->value.integer.value[0] & mask; val2 = ucontrol->value.integer.value[1] & mask; if (invert) { val1 = mask - val1; val2 = mask - val2; } val1 <<= shift_left; val2 <<= shift_right; spin_lock_irqsave(&chip->reg_lock, flags); if (left_reg != right_reg) { val1 = (chip->image[left_reg] & ~(mask << shift_left)) | val1; val2 = (chip->image[right_reg] & ~(mask << shift_right)) | val2; change = val1 != chip->image[left_reg] || val2 != chip->image[right_reg]; snd_ad1848_out(chip, left_reg, val1); snd_ad1848_out(chip, right_reg, val2); } else { val1 = (chip->image[left_reg] & ~((mask << shift_left) | (mask << shift_right))) | val1 | val2; change = val1 != chip->image[left_reg]; snd_ad1848_out(chip, left_reg, val1); } spin_unlock_irqrestore(&chip->reg_lock, flags); return change; } /* */ int snd_ad1848_add_ctl(struct snd_ad1848 *chip, const char *name, int index, int type, unsigned long value) { static struct snd_kcontrol_new newctls[] = { [AD1848_MIX_SINGLE] = { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .info = snd_ad1848_info_single, .get = snd_ad1848_get_single, .put = snd_ad1848_put_single, }, [AD1848_MIX_DOUBLE] = { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .info = snd_ad1848_info_double, .get = snd_ad1848_get_double, .put = snd_ad1848_put_double, }, [AD1848_MIX_CAPTURE] = { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .info = snd_ad1848_info_mux, .get = snd_ad1848_get_mux, .put = snd_ad1848_put_mux, }, }; struct snd_kcontrol *ctl; int err; ctl = snd_ctl_new1(&newctls[type], chip); if (! ctl) return -ENOMEM; strlcpy(ctl->id.name, name, sizeof(ctl->id.name)); ctl->id.index = index; ctl->private_value = value; if ((err = snd_ctl_add(chip->card, ctl)) < 0) { snd_ctl_free_one(ctl); return err; } return 0; } static struct ad1848_mix_elem snd_ad1848_controls[] = { AD1848_DOUBLE("PCM Playback Switch", 0, AD1848_LEFT_OUTPUT, AD1848_RIGHT_OUTPUT, 7, 7, 1, 1), AD1848_DOUBLE("PCM Playback Volume", 0, AD1848_LEFT_OUTPUT, AD1848_RIGHT_OUTPUT, 0, 0, 63, 1), AD1848_DOUBLE("Aux Playback Switch", 0, AD1848_AUX1_LEFT_INPUT, AD1848_AUX1_RIGHT_INPUT, 7, 7, 1, 1), AD1848_DOUBLE("Aux Playback Volume", 0, AD1848_AUX1_LEFT_INPUT, AD1848_AUX1_RIGHT_INPUT, 0, 0, 31, 1), AD1848_DOUBLE("Aux Playback Switch", 1, AD1848_AUX2_LEFT_INPUT, AD1848_AUX2_RIGHT_INPUT, 7, 7, 1, 1), AD1848_DOUBLE("Aux Playback Volume", 1, AD1848_AUX2_LEFT_INPUT, AD1848_AUX2_RIGHT_INPUT, 0, 0, 31, 1), AD1848_DOUBLE("Capture Volume", 0, AD1848_LEFT_INPUT, AD1848_RIGHT_INPUT, 0, 0, 15, 0), { .name = "Capture Source", .type = AD1848_MIX_CAPTURE, }, AD1848_SINGLE("Loopback Capture Switch", 0, AD1848_LOOPBACK, 0, 1, 0), AD1848_SINGLE("Loopback Capture Volume", 0, AD1848_LOOPBACK, 1, 63, 0) }; int snd_ad1848_mixer(struct snd_ad1848 *chip) { struct snd_card *card; struct snd_pcm *pcm; unsigned int idx; int err; snd_assert(chip != NULL && chip->pcm != NULL, return -EINVAL); pcm = chip->pcm; card = chip->card; strcpy(card->mixername, pcm->name); for (idx = 0; idx < ARRAY_SIZE(snd_ad1848_controls); idx++) if ((err = snd_ad1848_add_ctl_elem(chip, &snd_ad1848_controls[idx])) < 0) return err; return 0; } EXPORT_SYMBOL(snd_ad1848_out); EXPORT_SYMBOL(snd_ad1848_create); EXPORT_SYMBOL(snd_ad1848_pcm); EXPORT_SYMBOL(snd_ad1848_get_pcm_ops); EXPORT_SYMBOL(snd_ad1848_mixer); EXPORT_SYMBOL(snd_ad1848_add_ctl); /* * INIT part */ static int __init alsa_ad1848_init(void) { return 0; } static void __exit alsa_ad1848_exit(void) { } module_init(alsa_ad1848_init) module_exit(alsa_ad1848_exit)