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Diffstat (limited to 'sound/oss/skeleton.c')
| -rw-r--r-- | sound/oss/skeleton.c | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/sound/oss/skeleton.c b/sound/oss/skeleton.c new file mode 100644 index 00000000000..8fea783dd0c --- /dev/null +++ b/sound/oss/skeleton.c @@ -0,0 +1,219 @@ +/* + * PCI sound skeleton example + * + * (c) 1998 Red Hat Software + * + * This software may be used and distributed according to the + * terms of the GNU General Public License, incorporated herein by + * reference. + * + * This example is designed to be built in the linux/drivers/sound + * directory as part of a kernel build. The example is modular only + * drop me a note once you have a working modular driver and want + * to integrate it with the main code. + * -- Alan <alan@redhat.com> + * + * This is a first draft. Please report any errors, corrections or + * improvements to me. + */ + +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/errno.h> +#include <linux/fs.h> +#include <linux/kernel.h> +#include <linux/pci.h> + +#include <asm/io.h> + +#include "sound_config.h" + +/* + * Define our PCI vendor ID here + */ + +#ifndef PCI_VENDOR_MYIDENT +#define PCI_VENDOR_MYIDENT 0x125D + +/* + * PCI identity for the card. + */ + +#define PCI_DEVICE_ID_MYIDENT_MYCARD1 0x1969 +#endif + +#define CARD_NAME "ExampleWave 3D Pro Ultra ThingyWotsit" + +#define MAX_CARDS 8 + +/* + * Each address_info object holds the information about one of + * our card resources. In this case the MSS emulation of our + * ficticious card. Its used to manage and attach things. + */ + +static struct address_info mss_data[MAX_CARDS]; +static int cards; + +/* + * Install the actual card. This is an example + */ + +static int mycard_install(struct pci_dev *pcidev) +{ + int iobase; + int mssbase; + int mpubase; + u8 x; + u16 w; + u32 v; + int i; + int dma; + + /* + * Our imaginary code has its I/O on PCI address 0, a + * MSS on PCI address 1 and an MPU on address 2 + * + * For the example we will only initialise the MSS + */ + + iobase = pci_resource_start(pcidev, 0); + mssbase = pci_resource_start(pcidev, 1); + mpubase = pci_resource_start(pcidev, 2); + + /* + * Reset the board + */ + + /* + * Wait for completion. udelay() waits in microseconds + */ + + udelay(100); + + /* + * Ok card ready. Begin setup proper. You might for example + * load the firmware here + */ + + dma = card_specific_magic(ioaddr); + + /* + * Turn on legacy mode (example), There are also byte and + * dword (32bit) PCI configuration function calls + */ + + pci_read_config_word(pcidev, 0x40, &w); + w&=~(1<<15); /* legacy decode on */ + w|=(1<<14); /* Reserved write as 1 in this case */ + w|=(1<<3)|(1<<1)|(1<<0); /* SB on , FM on, MPU on */ + pci_write_config_word(pcidev, 0x40, w); + + /* + * Let the user know we found his toy. + */ + + printk(KERN_INFO "Programmed "CARD_NAME" at 0x%X to legacy mode.\n", + iobase); + + /* + * Now set it up the description of the card + */ + + mss_data[cards].io_base = mssbase; + mss_data[cards].irq = pcidev->irq; + mss_data[cards].dma = dma; + + /* + * Check there is an MSS present + */ + + if(ad1848_detect(mssbase, NULL, mss_data[cards].osp)==0) + return 0; + + /* + * Initialize it + */ + + mss_data[cards].slots[3] = ad1848_init("MyCard MSS 16bit", + mssbase, + mss_data[cards].irq, + mss_data[cards].dma, + mss_data[cards].dma, + 0, + 0, + THIS_MODULE); + + cards++; + return 1; +} + + +/* + * This loop walks the PCI configuration database and finds where + * the sound cards are. + */ + +int init_mycard(void) +{ + struct pci_dev *pcidev=NULL; + int count=0; + + while((pcidev = pci_find_device(PCI_VENDOR_MYIDENT, PCI_DEVICE_ID_MYIDENT_MYCARD1, pcidev))!=NULL) + { + if (pci_enable_device(pcidev)) + continue; + count+=mycard_install(pcidev); + if(count) + return 0; + if(count==MAX_CARDS) + break; + } + + if(count==0) + return -ENODEV; + return 0; +} + +/* + * This function is called when the user or kernel loads the + * module into memory. + */ + + +int init_module(void) +{ + if(init_mycard()<0) + { + printk(KERN_ERR "No "CARD_NAME" cards found.\n"); + return -ENODEV; + } + + return 0; +} + +/* + * This is called when it is removed. It will only be removed + * when its use count is 0. + */ + +void cleanup_module(void) +{ + for(i=0;i< cards; i++) + { + /* + * Free attached resources + */ + + ad1848_unload(mss_data[i].io_base, + mss_data[i].irq, + mss_data[i].dma, + mss_data[i].dma, + 0); + /* + * And disconnect the device from the kernel + */ + sound_unload_audiodevice(mss_data[i].slots[3]); + } +} + |