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linux/drivers/sbus/char/vfc_dev.c

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/*
* drivers/sbus/char/vfc_dev.c
*
* Driver for the Videopix Frame Grabber.
*
* In order to use the VFC you need to program the video controller
* chip. This chip is the Phillips SAA9051. You need to call their
* documentation ordering line to get the docs.
*
* There is very little documentation on the VFC itself. There is
* some useful info that can be found in the manuals that come with
* the card. I will hopefully write some better docs at a later date.
*
* Copyright (C) 1996 Manish Vachharajani (mvachhar@noc.rutgers.edu)
* */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/mm.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/sbus.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/uaccess.h>
#define VFC_MAJOR (60)
#if 0
#define VFC_IOCTL_DEBUG
#endif
#include "vfc.h"
#include <asm/vfc_ioctls.h>
static const struct file_operations vfc_fops;
struct vfc_dev **vfc_dev_lst;
static char vfcstr[]="vfc";
static unsigned char saa9051_init_array[VFC_SAA9051_NR] = {
0x00, 0x64, 0x72, 0x52,
0x36, 0x18, 0xff, 0x20,
0xfc, 0x77, 0xe3, 0x50,
0x3e
};
void vfc_lock_device(struct vfc_dev *dev)
{
mutex_lock(&dev->device_lock_mtx);
}
void vfc_unlock_device(struct vfc_dev *dev)
{
mutex_unlock(&dev->device_lock_mtx);
}
void vfc_captstat_reset(struct vfc_dev *dev)
{
dev->control_reg |= VFC_CONTROL_CAPTRESET;
sbus_writel(dev->control_reg, &dev->regs->control);
dev->control_reg &= ~VFC_CONTROL_CAPTRESET;
sbus_writel(dev->control_reg, &dev->regs->control);
dev->control_reg |= VFC_CONTROL_CAPTRESET;
sbus_writel(dev->control_reg, &dev->regs->control);
}
void vfc_memptr_reset(struct vfc_dev *dev)
{
dev->control_reg |= VFC_CONTROL_MEMPTR;
sbus_writel(dev->control_reg, &dev->regs->control);
dev->control_reg &= ~VFC_CONTROL_MEMPTR;
sbus_writel(dev->control_reg, &dev->regs->control);
dev->control_reg |= VFC_CONTROL_MEMPTR;
sbus_writel(dev->control_reg, &dev->regs->control);
}
int vfc_csr_init(struct vfc_dev *dev)
{
dev->control_reg = 0x80000000;
sbus_writel(dev->control_reg, &dev->regs->control);
udelay(200);
dev->control_reg &= ~0x80000000;
sbus_writel(dev->control_reg, &dev->regs->control);
udelay(100);
sbus_writel(0x0f000000, &dev->regs->i2c_magic2);
vfc_memptr_reset(dev);
dev->control_reg &= ~VFC_CONTROL_DIAGMODE;
dev->control_reg &= ~VFC_CONTROL_CAPTURE;
dev->control_reg |= 0x40000000;
sbus_writel(dev->control_reg, &dev->regs->control);
vfc_captstat_reset(dev);
return 0;
}
int vfc_saa9051_init(struct vfc_dev *dev)
{
int i;
for (i = 0; i < VFC_SAA9051_NR; i++)
dev->saa9051_state_array[i] = saa9051_init_array[i];
vfc_i2c_sendbuf(dev,VFC_SAA9051_ADDR,
dev->saa9051_state_array, VFC_SAA9051_NR);
return 0;
}
int init_vfc_hw(struct vfc_dev *dev)
{
vfc_lock_device(dev);
vfc_csr_init(dev);
vfc_pcf8584_init(dev);
vfc_init_i2c_bus(dev); /* hopefully this doesn't undo the magic
sun code above*/
vfc_saa9051_init(dev);
vfc_unlock_device(dev);
return 0;
}
int init_vfc_devstruct(struct vfc_dev *dev, int instance)
{
dev->instance=instance;
mutex_init(&dev->device_lock_mtx);
dev->control_reg=0;
dev->busy=0;
return 0;
}
int init_vfc_device(struct sbus_dev *sdev,struct vfc_dev *dev, int instance)
{
if(dev == NULL) {
printk(KERN_ERR "VFC: Bogus pointer passed\n");
return -ENOMEM;
}
printk("Initializing vfc%d\n",instance);
dev->regs = NULL;
dev->regs = (volatile struct vfc_regs __iomem *)
sbus_ioremap(&sdev->resource[0], 0,
sizeof(struct vfc_regs), vfcstr);
dev->which_io = sdev->reg_addrs[0].which_io;
dev->phys_regs = (struct vfc_regs *) sdev->reg_addrs[0].phys_addr;
if (dev->regs == NULL)
return -EIO;
printk("vfc%d: registers mapped at phys_addr: 0x%lx\n virt_addr: 0x%lx\n",
instance,(unsigned long)sdev->reg_addrs[0].phys_addr,(unsigned long)dev->regs);
if (init_vfc_devstruct(dev, instance))
return -EINVAL;
if (init_vfc_hw(dev))
return -EIO;
return 0;
}
struct vfc_dev *vfc_get_dev_ptr(int instance)
{
return vfc_dev_lst[instance];
}
static DEFINE_SPINLOCK(vfc_dev_lock);
static int vfc_open(struct inode *inode, struct file *file)
{
struct vfc_dev *dev;
spin_lock(&vfc_dev_lock);
dev = vfc_get_dev_ptr(iminor(inode));
if (dev == NULL) {
spin_unlock(&vfc_dev_lock);
return -ENODEV;
}
if (dev->busy) {
spin_unlock(&vfc_dev_lock);
return -EBUSY;
}
dev->busy = 1;
spin_unlock(&vfc_dev_lock);
vfc_lock_device(dev);
vfc_csr_init(dev);
vfc_pcf8584_init(dev);
vfc_init_i2c_bus(dev);
vfc_saa9051_init(dev);
vfc_memptr_reset(dev);
vfc_captstat_reset(dev);
vfc_unlock_device(dev);
return 0;
}
static int vfc_release(struct inode *inode,struct file *file)
{
struct vfc_dev *dev;
spin_lock(&vfc_dev_lock);
dev = vfc_get_dev_ptr(iminor(inode));
if (!dev || !dev->busy) {
spin_unlock(&vfc_dev_lock);
return -EINVAL;
}
dev->busy = 0;
spin_unlock(&vfc_dev_lock);
return 0;
}
static int vfc_debug(struct vfc_dev *dev, int cmd, void __user *argp)
{
struct vfc_debug_inout inout;
unsigned char *buffer;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
switch(cmd) {
case VFC_I2C_SEND:
if(copy_from_user(&inout, argp, sizeof(inout)))
return -EFAULT;
buffer = kmalloc(inout.len, GFP_KERNEL);
if (buffer == NULL)
return -ENOMEM;
if(copy_from_user(buffer, inout.buffer, inout.len)) {
kfree(buffer);
return -EFAULT;
}
vfc_lock_device(dev);
inout.ret=
vfc_i2c_sendbuf(dev,inout.addr & 0xff,
buffer,inout.len);
if (copy_to_user(argp,&inout,sizeof(inout))) {
vfc_unlock_device(dev);
kfree(buffer);
return -EFAULT;
}
vfc_unlock_device(dev);
break;
case VFC_I2C_RECV:
if (copy_from_user(&inout, argp, sizeof(inout)))
return -EFAULT;
buffer = kzalloc(inout.len, GFP_KERNEL);
if (buffer == NULL)
return -ENOMEM;
vfc_lock_device(dev);
inout.ret=
vfc_i2c_recvbuf(dev,inout.addr & 0xff
,buffer,inout.len);
vfc_unlock_device(dev);
if (copy_to_user(inout.buffer, buffer, inout.len)) {
kfree(buffer);
return -EFAULT;
}
if (copy_to_user(argp,&inout,sizeof(inout))) {
kfree(buffer);
return -EFAULT;
}
kfree(buffer);
break;
default:
return -EINVAL;
};
return 0;
}
int vfc_capture_start(struct vfc_dev *dev)
{
vfc_captstat_reset(dev);
dev->control_reg = sbus_readl(&dev->regs->control);
if((dev->control_reg & VFC_STATUS_CAPTURE)) {
printk(KERN_ERR "vfc%d: vfc capture status not reset\n",
dev->instance);
return -EIO;
}
vfc_lock_device(dev);
dev->control_reg &= ~VFC_CONTROL_CAPTURE;
sbus_writel(dev->control_reg, &dev->regs->control);
dev->control_reg |= VFC_CONTROL_CAPTURE;
sbus_writel(dev->control_reg, &dev->regs->control);
dev->control_reg &= ~VFC_CONTROL_CAPTURE;
sbus_writel(dev->control_reg, &dev->regs->control);
vfc_unlock_device(dev);
return 0;
}
int vfc_capture_poll(struct vfc_dev *dev)
{
int timeout = 1000;
while (!timeout--) {
if (sbus_readl(&dev->regs->control) & VFC_STATUS_CAPTURE)
break;
vfc_i2c_delay_no_busy(dev, 100);
}
if(!timeout) {
printk(KERN_WARNING "vfc%d: capture timed out\n",
dev->instance);
return -ETIMEDOUT;
}
return 0;
}
static int vfc_set_control_ioctl(struct inode *inode, struct file *file,
struct vfc_dev *dev, unsigned long arg)
{
int setcmd, ret = 0;
if (copy_from_user(&setcmd,(void __user *)arg,sizeof(unsigned int)))
return -EFAULT;
VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCSCTRL) arg=0x%x\n",
dev->instance,setcmd));
switch(setcmd) {
case MEMPRST:
vfc_lock_device(dev);
vfc_memptr_reset(dev);
vfc_unlock_device(dev);
ret=0;
break;
case CAPTRCMD:
vfc_capture_start(dev);
vfc_capture_poll(dev);
break;
case DIAGMODE:
if(capable(CAP_SYS_ADMIN)) {
vfc_lock_device(dev);
dev->control_reg |= VFC_CONTROL_DIAGMODE;
sbus_writel(dev->control_reg, &dev->regs->control);
vfc_unlock_device(dev);
ret = 0;
} else {
ret = -EPERM;
}
break;
case NORMMODE:
vfc_lock_device(dev);
dev->control_reg &= ~VFC_CONTROL_DIAGMODE;
sbus_writel(dev->control_reg, &dev->regs->control);
vfc_unlock_device(dev);
ret = 0;
break;
case CAPTRSTR:
vfc_capture_start(dev);
ret = 0;
break;
case CAPTRWAIT:
vfc_capture_poll(dev);
ret = 0;
break;
default:
ret = -EINVAL;
break;
};
return ret;
}
int vfc_port_change_ioctl(struct inode *inode, struct file *file,
struct vfc_dev *dev, unsigned long arg)
{
int ret = 0;
int cmd;
if(copy_from_user(&cmd, (void __user *)arg, sizeof(unsigned int))) {
VFC_IOCTL_DEBUG_PRINTK(("vfc%d: User passed bogus pointer to "
"vfc_port_change_ioctl\n",
dev->instance));
return -EFAULT;
}
VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCPORTCHG) arg=0x%x\n",
dev->instance, cmd));
switch(cmd) {
case 1:
case 2:
VFC_SAA9051_SA(dev,VFC_SAA9051_HSY_START) = 0x72;
VFC_SAA9051_SA(dev,VFC_SAA9051_HSY_STOP) = 0x52;
VFC_SAA9051_SA(dev,VFC_SAA9051_HC_START) = 0x36;
VFC_SAA9051_SA(dev,VFC_SAA9051_HC_STOP) = 0x18;
VFC_SAA9051_SA(dev,VFC_SAA9051_HORIZ_PEAK) = VFC_SAA9051_BP2;
VFC_SAA9051_SA(dev,VFC_SAA9051_C3) = VFC_SAA9051_CT | VFC_SAA9051_SS3;
VFC_SAA9051_SA(dev,VFC_SAA9051_SECAM_DELAY) = 0x3e;
break;
case 3:
VFC_SAA9051_SA(dev,VFC_SAA9051_HSY_START) = 0x3a;
VFC_SAA9051_SA(dev,VFC_SAA9051_HSY_STOP) = 0x17;
VFC_SAA9051_SA(dev,VFC_SAA9051_HC_START) = 0xfa;
VFC_SAA9051_SA(dev,VFC_SAA9051_HC_STOP) = 0xde;
VFC_SAA9051_SA(dev,VFC_SAA9051_HORIZ_PEAK) =
VFC_SAA9051_BY | VFC_SAA9051_PF | VFC_SAA9051_BP2;
VFC_SAA9051_SA(dev,VFC_SAA9051_C3) = VFC_SAA9051_YC;
VFC_SAA9051_SA(dev,VFC_SAA9051_SECAM_DELAY) = 0;
VFC_SAA9051_SA(dev,VFC_SAA9051_C2) &=
~(VFC_SAA9051_SS0 | VFC_SAA9051_SS1);
break;
default:
ret = -EINVAL;
return ret;
break;
}
switch(cmd) {
case 1:
VFC_SAA9051_SA(dev,VFC_SAA9051_C2) |=
(VFC_SAA9051_SS0 | VFC_SAA9051_SS1);
break;
case 2:
VFC_SAA9051_SA(dev,VFC_SAA9051_C2) &=
~(VFC_SAA9051_SS0 | VFC_SAA9051_SS1);
VFC_SAA9051_SA(dev,VFC_SAA9051_C2) |= VFC_SAA9051_SS0;
break;
case 3:
break;
default:
ret = -EINVAL;
return ret;
break;
}
VFC_SAA9051_SA(dev,VFC_SAA9051_C3) &= ~(VFC_SAA9051_SS2);
ret=vfc_update_saa9051(dev);
udelay(500);
VFC_SAA9051_SA(dev,VFC_SAA9051_C3) |= (VFC_SAA9051_SS2);
ret=vfc_update_saa9051(dev);
return ret;
}
int vfc_set_video_ioctl(struct inode *inode, struct file *file,
struct vfc_dev *dev, unsigned long arg)
{
int ret = 0;
int cmd;
if(copy_from_user(&cmd, (void __user *)arg, sizeof(unsigned int))) {
VFC_IOCTL_DEBUG_PRINTK(("vfc%d: User passed bogus pointer to "
"vfc_set_video_ioctl\n",
dev->instance));
return ret;
}
VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCSVID) arg=0x%x\n",
dev->instance, cmd));
switch(cmd) {
case STD_NTSC:
VFC_SAA9051_SA(dev,VFC_SAA9051_C1) &= ~VFC_SAA9051_ALT;
VFC_SAA9051_SA(dev,VFC_SAA9051_C1) |= VFC_SAA9051_YPN |
VFC_SAA9051_CCFR0 | VFC_SAA9051_CCFR1 | VFC_SAA9051_FS;
ret = vfc_update_saa9051(dev);
break;
case STD_PAL:
VFC_SAA9051_SA(dev,VFC_SAA9051_C1) &= ~(VFC_SAA9051_YPN |
VFC_SAA9051_CCFR1 |
VFC_SAA9051_CCFR0 |
VFC_SAA9051_FS);
VFC_SAA9051_SA(dev,VFC_SAA9051_C1) |= VFC_SAA9051_ALT;
ret = vfc_update_saa9051(dev);
break;
case COLOR_ON:
VFC_SAA9051_SA(dev,VFC_SAA9051_C1) |= VFC_SAA9051_CO;
VFC_SAA9051_SA(dev,VFC_SAA9051_HORIZ_PEAK) &=
~(VFC_SAA9051_BY | VFC_SAA9051_PF);
ret = vfc_update_saa9051(dev);
break;
case MONO:
VFC_SAA9051_SA(dev,VFC_SAA9051_C1) &= ~(VFC_SAA9051_CO);
VFC_SAA9051_SA(dev,VFC_SAA9051_HORIZ_PEAK) |=
(VFC_SAA9051_BY | VFC_SAA9051_PF);
ret = vfc_update_saa9051(dev);
break;
default:
ret = -EINVAL;
break;
};
return ret;
}
int vfc_get_video_ioctl(struct inode *inode, struct file *file,
struct vfc_dev *dev, unsigned long arg)
{
int ret = 0;
unsigned int status = NO_LOCK;
unsigned char buf[1];
if(vfc_i2c_recvbuf(dev, VFC_SAA9051_ADDR, buf, 1)) {
printk(KERN_ERR "vfc%d: Unable to get status\n",
dev->instance);
return -EIO;
}
if(buf[0] & VFC_SAA9051_HLOCK) {
status = NO_LOCK;
} else if(buf[0] & VFC_SAA9051_FD) {
if(buf[0] & VFC_SAA9051_CD)
status = NTSC_COLOR;
else
status = NTSC_NOCOLOR;
} else {
if(buf[0] & VFC_SAA9051_CD)
status = PAL_COLOR;
else
status = PAL_NOCOLOR;
}
VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCGVID) returning status 0x%x; "
"buf[0]=%x\n", dev->instance, status, buf[0]));
if (copy_to_user((void __user *)arg,&status,sizeof(unsigned int))) {
VFC_IOCTL_DEBUG_PRINTK(("vfc%d: User passed bogus pointer to "
"vfc_get_video_ioctl\n",
dev->instance));
return ret;
}
return ret;
}
static int vfc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg)
{
int ret = 0;
unsigned int tmp;
struct vfc_dev *dev;
void __user *argp = (void __user *)arg;
dev = vfc_get_dev_ptr(iminor(inode));
if(dev == NULL)
return -ENODEV;
switch(cmd & 0x0000ffff) {
case VFCGCTRL:
#if 0
VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCGCTRL)\n", dev->instance));
#endif
tmp = sbus_readl(&dev->regs->control);
if(copy_to_user(argp, &tmp, sizeof(unsigned int))) {
ret = -EFAULT;
break;
}
ret = 0;
break;
case VFCSCTRL:
ret = vfc_set_control_ioctl(inode, file, dev, arg);
break;
case VFCGVID:
ret = vfc_get_video_ioctl(inode, file, dev, arg);
break;
case VFCSVID:
ret = vfc_set_video_ioctl(inode, file, dev, arg);
break;
case VFCHUE:
VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCHUE)\n", dev->instance));
if(copy_from_user(&tmp,argp,sizeof(unsigned int))) {
VFC_IOCTL_DEBUG_PRINTK(("vfc%d: User passed bogus pointer "
"to IOCTL(VFCHUE)", dev->instance));
ret = -EFAULT;
} else {
VFC_SAA9051_SA(dev,VFC_SAA9051_HUE) = tmp;
vfc_update_saa9051(dev);
ret = 0;
}
break;
case VFCPORTCHG:
ret = vfc_port_change_ioctl(inode, file, dev, arg);
break;
case VFCRDINFO:
ret = -EINVAL;
VFC_IOCTL_DEBUG_PRINTK(("vfc%d: IOCTL(VFCRDINFO)\n", dev->instance));
break;
default:
ret = vfc_debug(vfc_get_dev_ptr(iminor(inode)), cmd, argp);
break;
};
return ret;
}
static int vfc_mmap(struct file *file, struct vm_area_struct *vma)
{
unsigned int map_size, ret, map_offset;
struct vfc_dev *dev;
dev = vfc_get_dev_ptr(iminor(file->f_path.dentry->d_inode));
if(dev == NULL)
return -ENODEV;
map_size = vma->vm_end - vma->vm_start;
if(map_size > sizeof(struct vfc_regs))
map_size = sizeof(struct vfc_regs);
vma->vm_flags |=
(VM_MAYREAD | VM_MAYWRITE | VM_MAYSHARE);
map_offset = (unsigned int) (long)dev->phys_regs;
ret = io_remap_pfn_range(vma, vma->vm_start,
MK_IOSPACE_PFN(dev->which_io,
map_offset >> PAGE_SHIFT),
map_size, vma->vm_page_prot);
if(ret)
return -EAGAIN;
return 0;
}
static const struct file_operations vfc_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.ioctl = vfc_ioctl,
.mmap = vfc_mmap,
.open = vfc_open,
.release = vfc_release,
};
static int vfc_probe(void)
{
struct sbus_bus *sbus;
struct sbus_dev *sdev = NULL;
int ret;
int instance = 0, cards = 0;
for_all_sbusdev(sdev, sbus) {
if (strcmp(sdev->prom_name, "vfc") == 0) {
cards++;
continue;
}
}
if (!cards)
return -ENODEV;
vfc_dev_lst = kcalloc(cards + 1, sizeof(struct vfc_dev*), GFP_KERNEL);
if (vfc_dev_lst == NULL)
return -ENOMEM;
vfc_dev_lst[cards] = NULL;
ret = register_chrdev(VFC_MAJOR, vfcstr, &vfc_fops);
if(ret) {
printk(KERN_ERR "Unable to get major number %d\n", VFC_MAJOR);
kfree(vfc_dev_lst);
return -EIO;
}
instance = 0;
for_all_sbusdev(sdev, sbus) {
if (strcmp(sdev->prom_name, "vfc") == 0) {
vfc_dev_lst[instance]=(struct vfc_dev *)
kmalloc(sizeof(struct vfc_dev), GFP_KERNEL);
if (vfc_dev_lst[instance] == NULL)
return -ENOMEM;
ret = init_vfc_device(sdev,
vfc_dev_lst[instance],
instance);
if(ret) {
printk(KERN_ERR "Unable to initialize"
" vfc%d device\n",
instance);
} else {
}
instance++;
continue;
}
}
return 0;
}
#ifdef MODULE
int init_module(void)
#else
int vfc_init(void)
#endif
{
return vfc_probe();
}
#ifdef MODULE
static void deinit_vfc_device(struct vfc_dev *dev)
{
if(dev == NULL)
return;
sbus_iounmap(dev->regs, sizeof(struct vfc_regs));
kfree(dev);
}
void cleanup_module(void)
{
struct vfc_dev **devp;
unregister_chrdev(VFC_MAJOR,vfcstr);
for (devp = vfc_dev_lst; *devp; devp++)
deinit_vfc_device(*devp);
kfree(vfc_dev_lst);
return;
}
#endif
MODULE_LICENSE("GPL");
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