![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
348 lines
7.4 KiB
C
348 lines
7.4 KiB
C
/*
|
|
* (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");
|