// SPDX-License-Identifier: GPL-2.0-only /* * Driver for the Conexant CX25821 PCIe bridge * * Copyright (C) 2009 Conexant Systems Inc. * Authors <[email protected]>, <[email protected]> * Based on SAA713x ALSA driver and CX88 driver */ #define pr_fmt(fmt) … #include <linux/module.h> #include <linux/init.h> #include <linux/device.h> #include <linux/interrupt.h> #include <linux/vmalloc.h> #include <linux/dma-mapping.h> #include <linux/pci.h> #include <linux/slab.h> #include <linux/delay.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/control.h> #include <sound/initval.h> #include <sound/tlv.h> #include "cx25821.h" #include "cx25821-reg.h" #define AUDIO_SRAM_CHANNEL … #define dprintk(level, fmt, arg...) … #define dprintk_core(level, fmt, arg...) … /**************************************************************************** Data type declarations - Can be moded to a header file later ****************************************************************************/ static int devno; struct cx25821_audio_buffer { … }; struct cx25821_audio_dev { … }; /**************************************************************************** Module global static vars ****************************************************************************/ static int index[SNDRV_CARDS] = …; /* Index 0-MAX */ static char *id[SNDRV_CARDS] = …; /* ID for this card */ static bool enable[SNDRV_CARDS] = …; module_param_array(…); MODULE_PARM_DESC(…) …; module_param_array(…); MODULE_PARM_DESC(…) …; /**************************************************************************** Module macros ****************************************************************************/ MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …; static unsigned int debug; module_param(debug, int, 0644); MODULE_PARM_DESC(…) …; /**************************************************************************** Module specific functions ****************************************************************************/ /* Constants taken from cx88-reg.h */ #define AUD_INT_DN_RISCI1 … #define AUD_INT_UP_RISCI1 … #define AUD_INT_RDS_DN_RISCI1 … #define AUD_INT_DN_RISCI2 … #define AUD_INT_UP_RISCI2 … #define AUD_INT_RDS_DN_RISCI2 … #define AUD_INT_DN_SYNC … #define AUD_INT_UP_SYNC … #define AUD_INT_RDS_DN_SYNC … #define AUD_INT_OPC_ERR … #define AUD_INT_BER_IRQ … #define AUD_INT_MCHG_IRQ … #define GP_COUNT_CONTROL_RESET … #define PCI_MSK_AUD_EXT … #define PCI_MSK_AUD_INT … static int cx25821_alsa_dma_init(struct cx25821_audio_dev *chip, unsigned long nr_pages) { … } static int cx25821_alsa_dma_map(struct cx25821_audio_dev *dev) { … } static int cx25821_alsa_dma_unmap(struct cx25821_audio_dev *dev) { … } static int cx25821_alsa_dma_free(struct cx25821_audio_buffer *buf) { … } /* * BOARD Specific: Sets audio DMA */ static int _cx25821_start_audio_dma(struct cx25821_audio_dev *chip) { … } /* * BOARD Specific: Resets audio DMA */ static int _cx25821_stop_audio_dma(struct cx25821_audio_dev *chip) { … } #define MAX_IRQ_LOOP … /* * BOARD Specific: IRQ dma bits */ static char *cx25821_aud_irqs[32] = …; /* * BOARD Specific: Threats IRQ audio specific calls */ static void cx25821_aud_irq(struct cx25821_audio_dev *chip, u32 status, u32 mask) { … } /* * BOARD Specific: Handles IRQ calls */ static irqreturn_t cx25821_irq(int irq, void *dev_id) { … } static int dsp_buffer_free(struct cx25821_audio_dev *chip) { … } /**************************************************************************** ALSA PCM Interface ****************************************************************************/ /* * Digital hardware definition */ #define DEFAULT_FIFO_SIZE … static const struct snd_pcm_hardware snd_cx25821_digital_hw = …; /* * audio pcm capture open callback */ static int snd_cx25821_pcm_open(struct snd_pcm_substream *substream) { … } /* * audio close callback */ static int snd_cx25821_close(struct snd_pcm_substream *substream) { … } /* * hw_params callback */ static int snd_cx25821_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params) { … } /* * hw free callback */ static int snd_cx25821_hw_free(struct snd_pcm_substream *substream) { … } /* * prepare callback */ static int snd_cx25821_prepare(struct snd_pcm_substream *substream) { … } /* * trigger callback */ static int snd_cx25821_card_trigger(struct snd_pcm_substream *substream, int cmd) { … } /* * pointer callback */ static snd_pcm_uframes_t snd_cx25821_pointer(struct snd_pcm_substream *substream) { … } /* * page callback (needed for mmap) */ static struct page *snd_cx25821_page(struct snd_pcm_substream *substream, unsigned long offset) { … } /* * operators */ static const struct snd_pcm_ops snd_cx25821_pcm_ops = …; /* * ALSA create a PCM device: Called when initializing the board. * Sets up the name and hooks up the callbacks */ static int snd_cx25821_pcm(struct cx25821_audio_dev *chip, int device, char *name) { … } /**************************************************************************** Basic Flow for Sound Devices ****************************************************************************/ /* * PCI ID Table - 14f1:8801 and 14f1:8811 means function 1: Audio * Only boards with eeprom and byte 1 at eeprom=1 have it */ static const struct pci_device_id __maybe_unused cx25821_audio_pci_tbl[] = …; MODULE_DEVICE_TABLE(pci, cx25821_audio_pci_tbl); /* * Alsa Constructor - Component probe */ static int cx25821_audio_initdev(struct cx25821_dev *dev) { … } /**************************************************************************** LINUX MODULE INIT ****************************************************************************/ static int cx25821_alsa_exit_callback(struct device *dev, void *data) { … } static void cx25821_audio_fini(void) { … } static int cx25821_alsa_init_callback(struct device *dev, void *data) { … } /* * Module initializer * * Loops through present saa7134 cards, and assigns an ALSA device * to each one * */ static int cx25821_alsa_init(void) { … } late_initcall(cx25821_alsa_init); module_exit(cx25821_audio_fini);
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