/*
* indycam.c - Silicon Graphics IndyCam digital camera driver
*
* Copyright (C) 2003 Ladislav Michl <ladis@linux-mips.org>
* Copyright (C) 2004,2005 Mikael Nousiainen <tmnousia@cc.hut.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/videodev.h>
/* IndyCam decodes stream of photons into digital image representation ;-) */
#include <linux/video_decoder.h>
#include <linux/i2c.h>
#include "indycam.h"
#define INDYCAM_MODULE_VERSION "0.0.5"
MODULE_DESCRIPTION("SGI IndyCam driver");
MODULE_VERSION(INDYCAM_MODULE_VERSION);
MODULE_AUTHOR("Mikael Nousiainen <tmnousia@cc.hut.fi>");
MODULE_LICENSE("GPL");
// #define INDYCAM_DEBUG
#ifdef INDYCAM_DEBUG
#define dprintk(x...) printk("IndyCam: " x);
#define indycam_regdump(client) indycam_regdump_debug(client)
#else
#define dprintk(x...)
#define indycam_regdump(client)
#endif
struct indycam {
struct i2c_client *client;
u8 version;
};
static struct i2c_driver i2c_driver_indycam;
static const u8 initseq[] = {
INDYCAM_CONTROL_AGCENA, /* INDYCAM_CONTROL */
INDYCAM_SHUTTER_60, /* INDYCAM_SHUTTER */
INDYCAM_GAIN_DEFAULT, /* INDYCAM_GAIN */
0x00, /* INDYCAM_BRIGHTNESS (read-only) */
INDYCAM_RED_BALANCE_DEFAULT, /* INDYCAM_RED_BALANCE */
INDYCAM_BLUE_BALANCE_DEFAULT, /* INDYCAM_BLUE_BALANCE */
INDYCAM_RED_SATURATION_DEFAULT, /* INDYCAM_RED_SATURATION */
INDYCAM_BLUE_SATURATION_DEFAULT,/* INDYCAM_BLUE_SATURATION */
};
/* IndyCam register handling */
static int indycam_read_reg(struct i2c_client *client, u8 reg, u8 *value)
{
int ret;
if (reg == INDYCAM_REG_RESET) {
dprintk("indycam_read_reg(): "
"skipping write-only register %d\n", reg);
*value = 0;
return 0;
}
ret = i2c_smbus_read_byte_data(client, reg);
if (ret < 0) {
printk(KERN_ERR "IndyCam: indycam_read_reg(): read failed, "
"register = 0x%02x\n", reg);
return ret;
}
*value = (u8)ret;
return 0;
}
static int indycam_write_reg(struct i2c_client *client, u8 reg, u8 value)
{
int err;
if ((reg == INDYCAM_REG_BRIGHTNESS)
|| (reg == INDYCAM_REG_VERSION)) {
dprintk("indycam_write_reg(): "
"skipping read-only register %d\n", reg);
return 0;
}
dprintk("Writing Reg %d = 0x%02x\n", reg, value);
err = i2c_smbus_write_byte_data(client, reg, value);
if (err) {
printk(KERN_ERR "IndyCam: indycam_write_reg(): write failed, "
"register = 0x%02x, value = 0x%02x\n", reg, value);
}
return err;
}
static int indycam_write_block(struct i2c_client *client, u8 reg,
u8 length, u8 *data)
{
int i, err;
for (i = 0; i < length; i++) {
err = indycam_write_reg(client, reg + i, data[i]);
if (err)
return err;
}
return 0;
}
/* Helper functions */
#ifdef INDYCAM_DEBUG
static void indycam_regdump_debug(struct i2c_client *client)
{
int i;
u8 val;
for (i = 0; i < 9; i++) {
indycam_read_reg(client, i, &val);
dprintk("Reg %d = 0x%02x\n", i, val);
}
}
#endif
static int indycam_get_control(struct i2c_client *client,
struct indycam_control *ctrl)
{
struct indycam *camera = i2c_get_clientdata(client);
u8 reg;
int ret = 0;
switch (ctrl->type) {
case INDYCAM_CONTROL_AGC:
case INDYCAM_CONTROL_AWB:
ret = indycam_read_reg(client, INDYCAM_REG_CONTROL, ®);
if (ret)
return -EIO;
if (ctrl->type == INDYCAM_CONTROL_AGC)
ctrl->value = (reg & INDYCAM_CONTROL_AGCENA)
? 1 : 0;
else
ctrl->value = (reg & INDYCAM_CONTROL_AWBCTL)
? 1 : 0;
break;
case INDYCAM_CONTROL_SHUTTER:
ret = indycam_read_reg(client, INDYCAM_REG_SHUTTER, ®);
if (ret)
return -EIO;
ctrl->value = ((s32)reg == 0x00) ? 0xff : ((s32)reg - 1);
break;
case INDYCAM_CONTROL_GAIN:
ret = indycam_read_reg(client, INDYCAM_REG_GAIN, ®);
if (ret)
return -EIO;
ctrl->value = (s32)reg;
break;
case INDYCAM_CONTROL_RED_BALANCE:
ret = indycam_read_reg(client, INDYCAM_REG_RED_BALANCE, ®);
if (ret)
return -EIO;
ctrl->value = (s32)reg;
break;
case INDYCAM_CONTROL_BLUE_BALANCE:
ret = indycam_read_reg(client, INDYCAM_REG_BLUE_BALANCE, ®);
if (ret)
return -EIO;
ctrl->value = (s32)reg;
break;
case INDYCAM_CONTROL_RED_SATURATION:
ret = indycam_read_reg(client,
INDYCAM_REG_RED_SATURATION, ®);
if (ret)
return -EIO;
ctrl->value = (s32)reg;
break;
case INDYCAM_CONTROL_BLUE_SATURATION:
ret = indycam_read_reg(client,
INDYCAM_REG_BLUE_SATURATION, ®);
if (ret)
return -EIO;
ctrl->value = (s32)reg;
break;
case INDYCAM_CONTROL_GAMMA:
if (camera->version == CAMERA_VERSION_MOOSE) {
ret = indycam_read_reg(client,
INDYCAM_REG_GAMMA, ®);
if (ret)
return -EIO;
ctrl->value = (s32)reg;
} else {
ctrl->value = INDYCAM_GAMMA_DEFAULT;
}
break;
default:
ret = -EINVAL;
}
return ret;
}
static int indycam_set_control(struct i2c_client *client,
struct indycam_control *ctrl)
{
struct indycam *camera = i2c_get_clientdata(client);
u8 reg;
int ret = 0;
switch (ctrl->type) {
case INDYCAM_CONTROL_AGC:
case INDYCAM_CONTROL_AWB:
ret = indycam_read_reg(client, INDYCAM_REG_CONTROL, ®);
if (ret)
break;
if (ctrl->type == INDYCAM_CONTROL_AGC) {
if (ctrl->value)
reg |= INDYCAM_CONTROL_AGCENA;
else
reg &= ~INDYCAM_CONTROL_AGCENA;
} else {
if (ctrl->value)
reg |= INDYCAM_CONTROL_AWBCTL;
else
reg &= ~INDYCAM_CONTROL_AWBCTL;
}
ret = indycam_write_reg(client, INDYCAM_REG_CONTROL, reg);
break;
case INDYCAM_CONTROL_SHUTTER:
reg = (ctrl->value == 0xff) ? 0x00 : (ctrl->value + 1);
ret = indycam_write_reg(client, INDYCAM_REG_SHUTTER, reg);
break;
case INDYCAM_CONTROL_GAIN:
ret = indycam_write_reg(client, INDYCAM_REG_GAIN, ctrl->value);
break;
case INDYCAM_CONTROL_RED_BALANCE:
ret = indycam_write_reg(client, INDYCAM_REG_RED_BALANCE,
ctrl->value);
break;
case INDYCAM_CONTROL_BLUE_BALANCE:
ret = indycam_write_reg(client, INDYCAM_REG_BLUE_BALANCE,
ctrl->value);
break;
case INDYCAM_CONTROL_RED_SATURATION:
ret = indycam_write_reg(client, INDYCAM_REG_RED_SATURATION,
ctrl->value);
break;
case INDYCAM_CONTROL_BLUE_SATURATION:
ret = indycam_write_reg(client, INDYCAM_REG_BLUE_SATURATION,
ctrl->value);
break;
case INDYCAM_CONTROL_GAMMA:
if (camera->version == CAMERA_VERSION_MOOSE) {
ret = indycam_write_reg(client, INDYCAM_REG_GAMMA,
ctrl->value);
}
break;
default:
ret = -EINVAL;
}
return ret;
}
/* I2C-interface */
static int indycam_attach(struct i2c_adapter *adap, int addr, int kind)
{
int err = 0;
struct indycam *camera;
struct i2c_client *client;
printk(KERN_INFO "SGI IndyCam driver version %s\n",
INDYCAM_MODULE_VERSION);
client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
if (!client)
return -ENOMEM;
camera = kzalloc(sizeof(struct indycam), GFP_KERNEL);
if (!camera) {
err = -ENOMEM;
goto out_free_client;
}
client->addr = addr;
client->adapter = adap;
client->driver = &i2c_driver_indycam;
client->flags = 0;
strcpy(client->name, "IndyCam client");
i2c_set_clientdata(client, camera);
camera->client = client;
err = i2c_attach_client(client);
if (err)
goto out_free_camera;
camera->version = i2c_smbus_read_byte_data(client,
INDYCAM_REG_VERSION);
if (camera->version != CAMERA_VERSION_INDY &&
camera->version != CAMERA_VERSION_MOOSE) {
err = -ENODEV;
goto out_detach_client;
}
printk(KERN_INFO "IndyCam v%d.%d detected\n",
INDYCAM_VERSION_MAJOR(camera->version),
INDYCAM_VERSION_MINOR(camera->version));
indycam_regdump(client);
// initialize
err = indycam_write_block(client, 0, sizeof(initseq), (u8 *)&initseq);
if (err) {
printk(KERN_ERR "IndyCam initialization failed\n");
err = -EIO;
goto out_detach_client;
}
indycam_regdump(client);
// white balance
err = indycam_write_reg(client, INDYCAM_REG_CONTROL,
INDYCAM_CONTROL_AGCENA | INDYCAM_CONTROL_AWBCTL);
if (err) {
printk(KERN_ERR "IndyCam: White balancing camera failed\n");
err = -EIO;
goto out_detach_client;
}
indycam_regdump(client);
printk(KERN_INFO "IndyCam initialized\n");
return 0;
out_detach_client:
i2c_detach_client(client);
out_free_camera:
kfree(camera);
out_free_client:
kfree(client);
return err;
}
static int indycam_probe(struct i2c_adapter *adap)
{
/* Indy specific crap */
if (adap->id == I2C_HW_SGI_VINO)
return indycam_attach(adap, INDYCAM_ADDR, 0);
/* Feel free to add probe here :-) */
return -ENODEV;
}
static int indycam_detach(struct i2c_client *client)
{
struct indycam *camera = i2c_get_clientdata(client);
i2c_detach_client(client);
kfree(camera);
kfree(client);
return 0;
}
static int indycam_command(struct i2c_client *client, unsigned int cmd,
void *arg)
{
// struct indycam *camera = i2c_get_clientdata(client);
/* The old video_decoder interface just isn't enough,
* so we'll use some custom commands. */
switch (cmd) {
case DECODER_GET_CAPABILITIES: {
struct video_decoder_capability *cap = arg;
cap->flags = VIDEO_DECODER_NTSC;
cap->inputs = 1;
cap->outputs = 1;
break;
}
case DECODER_GET_STATUS: {
int *iarg = arg;
*iarg = DECODER_STATUS_GOOD | DECODER_STATUS_NTSC |
DECODER_STATUS_COLOR;
break;
}
case DECODER_SET_NORM: {
int *iarg = arg;
switch (*iarg) {
case VIDEO_MODE_NTSC:
break;
default:
return -EINVAL;
}
break;
}
case DECODER_SET_INPUT: {
int *iarg = arg;
if (*iarg != 0)
return -EINVAL;
break;
}
case DECODER_SET_OUTPUT: {
int *iarg = arg;
if (*iarg != 0)
return -EINVAL;
break;
}
case DECODER_ENABLE_OUTPUT: {
/* Always enabled */
break;
}
case DECODER_SET_PICTURE: {
// struct video_picture *pic = arg;
/* TODO: convert values for indycam_set_controls() */
break;
}
case DECODER_INDYCAM_GET_CONTROL: {
return indycam_get_control(client, arg);
}
case DECODER_INDYCAM_SET_CONTROL: {
return indycam_set_control(client, arg);
}
default:
return -EINVAL;
}
return 0;
}
static struct i2c_driver i2c_driver_indycam = {
.driver = {
.name = "indycam",
},
.id = I2C_DRIVERID_INDYCAM,
.attach_adapter = indycam_probe,
.detach_client = indycam_detach,
.command = indycam_command,
};
static int __init indycam_init(void)
{
return i2c_add_driver(&i2c_driver_indycam);
}
static void __exit indycam_exit(void)
{
i2c_del_driver(&i2c_driver_indycam);
}
module_init(indycam_init);
module_exit(indycam_exit);