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linux/drivers/media/video/bt832.c
Jean Delvare b3d5496ea5 [PATCH] I2C: Kill address ranges in non-sensors i2c chip drivers 
Some months ago, you killed the address ranges mechanism from all
sensors i2c chip drivers (both the module parameters and the in-code
address lists). I think it was a very good move, as the ranges can
easily be replaced by individual addresses, and this allowed for
significant cleanups in the i2c core (let alone the impressive size
shrink for all these drivers).

Unfortunately you did not do the same for non-sensors i2c chip drivers.
These need the address ranges even less, so we could get rid of the
ranges here as well for another significant i2c core cleanup. Here comes
a patch which does just that. Since the process is exactly the same as
what you did for the other drivers set already, I did not split this one
in parts.

A documentation update is included.

The change saves 308 bytes in the i2c core, and an average 1382 bytes
for chip drivers which use I2C_CLIENT_INSMOD, 126 bytes for those which
do not.

This change is required if we want to merge the sensors and non-sensors
i2c code (and we want to do this).

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

Index: gregkh-2.6/Documentation/i2c/writing-clients
===================================================================
2005-06-21 21:51:48 -07:00

272 lines
6.8 KiB
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/* Driver for Bt832 CMOS Camera Video Processor
i2c-addresses: 0x88 or 0x8a
The BT832 interfaces to a Quartzsight Digital Camera (352x288, 25 or 30 fps)
via a 9 pin connector ( 4-wire SDATA, 2-wire i2c, SCLK, VCC, GND).
It outputs an 8-bit 4:2:2 YUV or YCrCb video signal which can be directly
connected to bt848/bt878 GPIO pins on this purpose.
(see: VLSI Vision Ltd. www.vvl.co.uk for camera datasheets)
Supported Cards:
- Pixelview Rev.4E: 0x8a
GPIO 0x400000 toggles Bt832 RESET, and the chip changes to i2c 0x88 !
(c) Gunther Mayer, 2002
STATUS:
- detect chip and hexdump
- reset chip and leave low power mode
- detect camera present
TODO:
- make it work (find correct setup for Bt832 and Bt878)
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/i2c.h>
#include <linux/types.h>
#include <linux/videodev.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include "id.h"
#include "audiochip.h"
#include "bttv.h"
#include "bt832.h"
MODULE_LICENSE("GPL");
/* Addresses to scan */
static unsigned short normal_i2c[] = { I2C_BT832_ALT1>>1, I2C_BT832_ALT2>>1,
I2C_CLIENT_END };
I2C_CLIENT_INSMOD;
/* ---------------------------------------------------------------------- */
#define dprintk if (debug) printk
static int bt832_detach(struct i2c_client *client);
static struct i2c_driver driver;
static struct i2c_client client_template;
struct bt832 {
struct i2c_client client;
};
int bt832_hexdump(struct i2c_client *i2c_client_s, unsigned char *buf)
{
int i,rc;
buf[0]=0x80; // start at register 0 with auto-increment
if (1 != (rc = i2c_master_send(i2c_client_s,buf,1)))
printk("bt832: i2c i/o error: rc == %d (should be 1)\n",rc);
for(i=0;i<65;i++)
buf[i]=0;
if (65 != (rc=i2c_master_recv(i2c_client_s,buf,65)))
printk("bt832: i2c i/o error: rc == %d (should be 65)\n",rc);
// Note: On READ the first byte is the current index
// (e.g. 0x80, what we just wrote)
if(1) {
int i;
printk("BT832 hexdump:\n");
for(i=1;i<65;i++) {
if(i!=1) {
if(((i-1)%8)==0) printk(" ");
if(((i-1)%16)==0) printk("\n");
}
printk(" %02x",buf[i]);
}
printk("\n");
}
return 0;
}
// Return: 1 (is a bt832), 0 (No bt832 here)
int bt832_init(struct i2c_client *i2c_client_s)
{
unsigned char *buf;
int rc;
buf=kmalloc(65,GFP_KERNEL);
bt832_hexdump(i2c_client_s,buf);
if(buf[0x40] != 0x31) {
printk("bt832: this i2c chip is no bt832 (id=%02x). Detaching.\n",buf[0x40]);
kfree(buf);
return 0;
}
printk("Write 0 tp VPSTATUS\n");
buf[0]=BT832_VP_STATUS; // Reg.52
buf[1]= 0x00;
if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
printk("bt832: i2c i/o error VPS: rc == %d (should be 2)\n",rc);
bt832_hexdump(i2c_client_s,buf);
// Leave low power mode:
printk("Bt832: leave low power mode.\n");
buf[0]=BT832_CAM_SETUP0; //0x39 57
buf[1]=0x08;
if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
printk("bt832: i2c i/o error LLPM: rc == %d (should be 2)\n",rc);
bt832_hexdump(i2c_client_s,buf);
printk("Write 0 tp VPSTATUS\n");
buf[0]=BT832_VP_STATUS; // Reg.52
buf[1]= 0x00;
if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
printk("bt832: i2c i/o error VPS: rc == %d (should be 2)\n",rc);
bt832_hexdump(i2c_client_s,buf);
// Enable Output
printk("Enable Output\n");
buf[0]=BT832_VP_CONTROL1; // Reg.40
buf[1]= 0x27 & (~0x01); // Default | !skip
if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
printk("bt832: i2c i/o error EO: rc == %d (should be 2)\n",rc);
bt832_hexdump(i2c_client_s,buf);
#if 0
// Full 30/25 Frame rate
printk("Full 30/25 Frame rate\n");
buf[0]=BT832_VP_CONTROL0; // Reg.39
buf[1]= 0x00;
if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
printk("bt832: i2c i/o error FFR: rc == %d (should be 2)\n",rc);
bt832_hexdump(i2c_client_s,buf);
#endif
#if 1
// for testing (even works when no camera attached)
printk("bt832: *** Generate NTSC M Bars *****\n");
buf[0]=BT832_VP_TESTCONTROL0; // Reg. 42
buf[1]=3; // Generate NTSC System M bars, Generate Frame timing internally
if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
printk("bt832: i2c i/o error MBAR: rc == %d (should be 2)\n",rc);
#endif
printk("Bt832: Camera Present: %s\n",
(buf[1+BT832_CAM_STATUS] & BT832_56_CAMERA_PRESENT) ? "yes":"no");
bt832_hexdump(i2c_client_s,buf);
kfree(buf);
return 1;
}
static int bt832_attach(struct i2c_adapter *adap, int addr,
unsigned short flags, int kind)
{
struct bt832 *t;
printk("bt832_attach\n");
client_template.adapter = adap;
client_template.addr = addr;
printk("bt832: chip found @ 0x%x\n", addr<<1);
if (NULL == (t = kmalloc(sizeof(*t), GFP_KERNEL)))
return -ENOMEM;
memset(t,0,sizeof(*t));
t->client = client_template;
t->client.data = t;
i2c_attach_client(&t->client);
if(! bt832_init(&t->client)) {
bt832_detach(&t->client);
return -1;
}
return 0;
}
static int bt832_probe(struct i2c_adapter *adap)
{
if (adap->class & I2C_CLASS_TV_ANALOG)
return i2c_probe(adap, &addr_data, bt832_attach);
return 0;
}
static int bt832_detach(struct i2c_client *client)
{
struct bt832 *t = (struct bt832*)client->data;
printk("bt832: detach.\n");
i2c_detach_client(client);
kfree(t);
return 0;
}
static int
bt832_command(struct i2c_client *client, unsigned int cmd, void *arg)
{
struct bt832 *t = (struct bt832*)client->data;
printk("bt832: command %x\n",cmd);
switch (cmd) {
case BT832_HEXDUMP: {
unsigned char *buf;
buf=kmalloc(65,GFP_KERNEL);
bt832_hexdump(&t->client,buf);
kfree(buf);
}
break;
case BT832_REATTACH:
printk("bt832: re-attach\n");
i2c_del_driver(&driver);
i2c_add_driver(&driver);
break;
}
return 0;
}
/* ----------------------------------------------------------------------- */
static struct i2c_driver driver = {
.owner = THIS_MODULE,
.name = "i2c bt832 driver",
.id = -1, /* FIXME */
.flags = I2C_DF_NOTIFY,
.attach_adapter = bt832_probe,
.detach_client = bt832_detach,
.command = bt832_command,
};
static struct i2c_client client_template =
{
.name = "bt832",
.flags = I2C_CLIENT_ALLOW_USE,
.driver = &driver,
};
int bt832_init_module(void)
{
i2c_add_driver(&driver);
return 0;
}
static void bt832_cleanup_module(void)
{
i2c_del_driver(&driver);
}
module_init(bt832_init_module);
module_exit(bt832_cleanup_module);
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