linux/drivers/media/video/vino.c

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/*
* (incomplete) Driver for the VINO (Video In No Out) system found in SGI Indys.
*
* This file is subject to the terms and conditions of the GNU General Public
* License version 2 as published by the Free Software Foundation.
*
* Copyright (C) 2003 Ladislav Michl <ladis@linux-mips.org>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/wrapper.h>
#include <linux/errno.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/videodev.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-sgi.h>
#include <asm/addrspace.h>
#include <asm/system.h>
#include <asm/bootinfo.h>
#include <asm/pgtable.h>
#include <asm/paccess.h>
#include <asm/io.h>
#include <asm/sgi/ip22.h>
#include <asm/sgi/hpc3.h>
#include <asm/sgi/mc.h>
#include "vino.h"
/* debugging? */
#if 1
#define DEBUG(x...) printk(x);
#else
#define DEBUG(x...)
#endif
/* VINO ASIC registers */
struct sgi_vino *vino;
static const char *vinostr = "VINO IndyCam/TV";
static int threshold_a = 512;
static int threshold_b = 512;
struct vino_device {
struct video_device vdev;
#define VINO_CHAN_A 1
#define VINO_CHAN_B 2
int chan;
};
struct vino_client {
struct i2c_client *driver;
int owner;
};
struct vino_video {
struct vino_device chA;
struct vino_device chB;
struct vino_client decoder;
struct vino_client camera;
struct semaphore input_lock;
/* Loaded into VINO descriptors to clear End Of Descriptors table
* interupt condition */
unsigned long dummy_page;
unsigned int dummy_buf[4] __attribute__((aligned(8)));
};
static struct vino_video *Vino;
unsigned i2c_vino_getctrl(void *data)
{
return vino->i2c_control;
}
void i2c_vino_setctrl(void *data, unsigned val)
{
vino->i2c_control = val;
}
unsigned i2c_vino_rdata(void *data)
{
return vino->i2c_data;
}
void i2c_vino_wdata(void *data, unsigned val)
{
vino->i2c_data = val;
}
static struct i2c_algo_sgi_data i2c_sgi_vino_data =
{
.getctrl = &i2c_vino_getctrl,
.setctrl = &i2c_vino_setctrl,
.rdata = &i2c_vino_rdata,
.wdata = &i2c_vino_wdata,
.xfer_timeout = 200,
.ack_timeout = 1000,
};
/*
* There are two possible clients on VINO I2C bus, so we limit usage only
* to them.
*/
static int i2c_vino_client_reg(struct i2c_client *client)
{
int res = 0;
down(&Vino->input_lock);
switch (client->driver->id) {
case I2C_DRIVERID_SAA7191:
if (Vino->decoder.driver)
res = -EBUSY;
else
Vino->decoder.driver = client;
break;
case I2C_DRIVERID_INDYCAM:
if (Vino->camera.driver)
res = -EBUSY;
else
Vino->camera.driver = client;
break;
default:
res = -ENODEV;
}
up(&Vino->input_lock);
return res;
}
static int i2c_vino_client_unreg(struct i2c_client *client)
{
int res = 0;
down(&Vino->input_lock);
if (client == Vino->decoder.driver) {
if (Vino->decoder.owner)
res = -EBUSY;
else
Vino->decoder.driver = NULL;
} else if (client == Vino->camera.driver) {
if (Vino->camera.owner)
res = -EBUSY;
else
Vino->camera.driver = NULL;
}
up(&Vino->input_lock);
return res;
}
static struct i2c_adapter vino_i2c_adapter =
{
.name = "VINO I2C bus",
.id = I2C_HW_SGI_VINO,
.algo_data = &i2c_sgi_vino_data,
.client_register = &i2c_vino_client_reg,
.client_unregister = &i2c_vino_client_unreg,
};
static int vino_i2c_add_bus(void)
{
return i2c_sgi_add_bus(&vino_i2c_adapter);
}
static int vino_i2c_del_bus(void)
{
return i2c_sgi_del_bus(&vino_i2c_adapter);
}
static void vino_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
}
static int vino_open(struct video_device *dev, int flags)
{
struct vino_device *videv = (struct vino_device *)dev;
return 0;
}
static void vino_close(struct video_device *dev)
{
struct vino_device *videv = (struct vino_device *)dev;
}
static int vino_mmap(struct video_device *dev, const char *adr,
unsigned long size)
{
struct vino_device *videv = (struct vino_device *)dev;
return -EINVAL;
}
static int vino_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
{
struct vino_device *videv = (struct vino_device *)dev;
return -EINVAL;
}
static const struct video_device vino_device = {
.owner = THIS_MODULE,
.type = VID_TYPE_CAPTURE | VID_TYPE_SUBCAPTURE,
.hardware = VID_HARDWARE_VINO,
.name = "VINO",
.open = vino_open,
.close = vino_close,
.ioctl = vino_ioctl,
.mmap = vino_mmap,
};
static int __init vino_init(void)
{
unsigned long rev;
int i, ret = 0;
/* VINO is Indy specific beast */
if (ip22_is_fullhouse())
return -ENODEV;
/*
* VINO is in the EISA address space, so the sysid register will tell
* us if the EISA_PRESENT pin on MC has been pulled low.
*
* If EISA_PRESENT is not set we definitely don't have a VINO equiped
* system.
*/
if (!(sgimc->systemid & SGIMC_SYSID_EPRESENT)) {
printk(KERN_ERR "VINO not found\n");
return -ENODEV;
}
vino = (struct sgi_vino *)ioremap(VINO_BASE, sizeof(struct sgi_vino));
if (!vino)
return -EIO;
/* Okay, once we know that VINO is present we'll read its revision
* safe way. One never knows... */
if (get_dbe(rev, &(vino->rev_id))) {
printk(KERN_ERR "VINO: failed to read revision register\n");
ret = -ENODEV;
goto out_unmap;
}
if (VINO_ID_VALUE(rev) != VINO_CHIP_ID) {
printk(KERN_ERR "VINO is not VINO (Rev/ID: 0x%04lx)\n", rev);
ret = -ENODEV;
goto out_unmap;
}
printk(KERN_INFO "VINO Rev: 0x%02lx\n", VINO_REV_NUM(rev));
Vino = (struct vino_video *)
kmalloc(sizeof(struct vino_video), GFP_KERNEL);
if (!Vino) {
ret = -ENOMEM;
goto out_unmap;
}
Vino->dummy_page = get_zeroed_page(GFP_KERNEL | GFP_DMA);
if (!Vino->dummy_page) {
ret = -ENOMEM;
goto out_free_vino;
}
for (i = 0; i < 4; i++)
Vino->dummy_buf[i] = PHYSADDR(Vino->dummy_page);
vino->control = 0;
/* prevent VINO from throwing spurious interrupts */
vino->a.next_4_desc = PHYSADDR(Vino->dummy_buf);
vino->b.next_4_desc = PHYSADDR(Vino->dummy_buf);
udelay(5);
vino->intr_status = 0;
/* set threshold level */
vino->a.fifo_thres = threshold_a;
vino->b.fifo_thres = threshold_b;
init_MUTEX(&Vino->input_lock);
if (request_irq(SGI_VINO_IRQ, vino_interrupt, 0, vinostr, NULL)) {
printk(KERN_ERR "VINO: irq%02d registration failed\n",
SGI_VINO_IRQ);
ret = -EAGAIN;
goto out_free_page;
}
ret = vino_i2c_add_bus();
if (ret) {
printk(KERN_ERR "VINO: I2C bus registration failed\n");
goto out_free_irq;
}
if (video_register_device(&Vino->chA.vdev, VFL_TYPE_GRABBER, -1) < 0) {
printk("%s, chnl %d: device registration failed.\n",
Vino->chA.vdev.name, Vino->chA.chan);
ret = -EINVAL;
goto out_i2c_del_bus;
}
if (video_register_device(&Vino->chB.vdev, VFL_TYPE_GRABBER, -1) < 0) {
printk("%s, chnl %d: device registration failed.\n",
Vino->chB.vdev.name, Vino->chB.chan);
ret = -EINVAL;
goto out_unregister_vdev;
}
return 0;
out_unregister_vdev:
video_unregister_device(&Vino->chA.vdev);
out_i2c_del_bus:
vino_i2c_del_bus();
out_free_irq:
free_irq(SGI_VINO_IRQ, NULL);
out_free_page:
free_page(Vino->dummy_page);
out_free_vino:
kfree(Vino);
out_unmap:
iounmap(vino);
return ret;
}
static void __exit vino_exit(void)
{
video_unregister_device(&Vino->chA.vdev);
video_unregister_device(&Vino->chB.vdev);
vino_i2c_del_bus();
free_irq(SGI_VINO_IRQ, NULL);
free_page(Vino->dummy_page);
kfree(Vino);
iounmap(vino);
}
module_init(vino_init);
module_exit(vino_exit);
MODULE_DESCRIPTION("Video4Linux driver for SGI Indy VINO (IndyCam)");
MODULE_LICENSE("GPL");