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linux/drivers/media/video/saa7110.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

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/*
* saa7110 - Philips SAA7110(A) video decoder driver
*
* Copyright (C) 1998 Pauline Middelink <middelin@polyware.nl>
*
* Copyright (C) 1999 Wolfgang Scherr <scherr@net4you.net>
* Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
* - some corrections for Pinnacle Systems Inc. DC10plus card.
*
* Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
* - moved over to linux>=2.4.x i2c protocol (1/1/2003)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/wait.h>
#include <asm/io.h>
#include <asm/uaccess.h>
MODULE_DESCRIPTION("Philips SAA7110 video decoder driver");
MODULE_AUTHOR("Pauline Middelink");
MODULE_LICENSE("GPL");
#include <linux/i2c.h>
#include <linux/i2c-dev.h>
#define I2C_NAME(s) (s)->name
#include <linux/videodev.h>
#include <linux/video_decoder.h>
static int debug = 0;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0-1)");
#define dprintk(num, format, args...) \
do { \
if (debug >= num) \
printk(format, ##args); \
} while (0)
#define SAA7110_MAX_INPUT 9 /* 6 CVBS, 3 SVHS */
#define SAA7110_MAX_OUTPUT 0 /* its a decoder only */
#define I2C_SAA7110 0x9C /* or 0x9E */
#define SAA7110_NR_REG 0x35
struct saa7110 {
u8 reg[SAA7110_NR_REG];
int norm;
int input;
int enable;
int bright;
int contrast;
int hue;
int sat;
wait_queue_head_t wq;
};
/* ----------------------------------------------------------------------- */
/* I2C support functions */
/* ----------------------------------------------------------------------- */
static int
saa7110_write (struct i2c_client *client,
u8 reg,
u8 value)
{
struct saa7110 *decoder = i2c_get_clientdata(client);
decoder->reg[reg] = value;
return i2c_smbus_write_byte_data(client, reg, value);
}
static int
saa7110_write_block (struct i2c_client *client,
const u8 *data,
unsigned int len)
{
int ret = -1;
u8 reg = *data; /* first register to write to */
/* Sanity check */
if (reg + (len - 1) > SAA7110_NR_REG)
return ret;
/* the saa7110 has an autoincrement function, use it if
* the adapter understands raw I2C */
if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
struct saa7110 *decoder = i2c_get_clientdata(client);
struct i2c_msg msg;
msg.len = len;
msg.buf = (char *) data;
msg.addr = client->addr;
msg.flags = 0;
ret = i2c_transfer(client->adapter, &msg, 1);
/* Cache the written data */
memcpy(decoder->reg + reg, data + 1, len - 1);
} else {
for (++data, --len; len; len--) {
if ((ret = saa7110_write(client, reg++,
*data++)) < 0)
break;
}
}
return ret;
}
static inline int
saa7110_read (struct i2c_client *client)
{
return i2c_smbus_read_byte(client);
}
/* ----------------------------------------------------------------------- */
/* SAA7110 functions */
/* ----------------------------------------------------------------------- */
#define FRESP_06H_COMPST 0x03 //0x13
#define FRESP_06H_SVIDEO 0x83 //0xC0
static int
saa7110_selmux (struct i2c_client *client,
int chan)
{
static const unsigned char modes[9][8] = {
/* mode 0 */
{FRESP_06H_COMPST, 0xD9, 0x17, 0x40, 0x03,
0x44, 0x75, 0x16},
/* mode 1 */
{FRESP_06H_COMPST, 0xD8, 0x17, 0x40, 0x03,
0x44, 0x75, 0x16},
/* mode 2 */
{FRESP_06H_COMPST, 0xBA, 0x07, 0x91, 0x03,
0x60, 0xB5, 0x05},
/* mode 3 */
{FRESP_06H_COMPST, 0xB8, 0x07, 0x91, 0x03,
0x60, 0xB5, 0x05},
/* mode 4 */
{FRESP_06H_COMPST, 0x7C, 0x07, 0xD2, 0x83,
0x60, 0xB5, 0x03},
/* mode 5 */
{FRESP_06H_COMPST, 0x78, 0x07, 0xD2, 0x83,
0x60, 0xB5, 0x03},
/* mode 6 */
{FRESP_06H_SVIDEO, 0x59, 0x17, 0x42, 0xA3,
0x44, 0x75, 0x12},
/* mode 7 */
{FRESP_06H_SVIDEO, 0x9A, 0x17, 0xB1, 0x13,
0x60, 0xB5, 0x14},
/* mode 8 */
{FRESP_06H_SVIDEO, 0x3C, 0x27, 0xC1, 0x23,
0x44, 0x75, 0x21}
};
struct saa7110 *decoder = i2c_get_clientdata(client);
const unsigned char *ptr = modes[chan];
saa7110_write(client, 0x06, ptr[0]); /* Luminance control */
saa7110_write(client, 0x20, ptr[1]); /* Analog Control #1 */
saa7110_write(client, 0x21, ptr[2]); /* Analog Control #2 */
saa7110_write(client, 0x22, ptr[3]); /* Mixer Control #1 */
saa7110_write(client, 0x2C, ptr[4]); /* Mixer Control #2 */
saa7110_write(client, 0x30, ptr[5]); /* ADCs gain control */
saa7110_write(client, 0x31, ptr[6]); /* Mixer Control #3 */
saa7110_write(client, 0x21, ptr[7]); /* Analog Control #2 */
decoder->input = chan;
return 0;
}
static const unsigned char initseq[1 + SAA7110_NR_REG] = {
0, 0x4C, 0x3C, 0x0D, 0xEF, 0xBD, 0xF2, 0x03, 0x00,
/* 0x08 */ 0xF8, 0xF8, 0x60, 0x60, 0x00, 0x86, 0x18, 0x90,
/* 0x10 */ 0x00, 0x59, 0x40, 0x46, 0x42, 0x1A, 0xFF, 0xDA,
/* 0x18 */ 0xF2, 0x8B, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/* 0x20 */ 0xD9, 0x16, 0x40, 0x41, 0x80, 0x41, 0x80, 0x4F,
/* 0x28 */ 0xFE, 0x01, 0xCF, 0x0F, 0x03, 0x01, 0x03, 0x0C,
/* 0x30 */ 0x44, 0x71, 0x02, 0x8C, 0x02
};
static int
determine_norm (struct i2c_client *client)
{
DEFINE_WAIT(wait);
struct saa7110 *decoder = i2c_get_clientdata(client);
int status;
/* mode changed, start automatic detection */
saa7110_write_block(client, initseq, sizeof(initseq));
saa7110_selmux(client, decoder->input);
prepare_to_wait(&decoder->wq, &wait, TASK_UNINTERRUPTIBLE);
schedule_timeout(HZ/4);
finish_wait(&decoder->wq, &wait);
status = saa7110_read(client);
if (status & 0x40) {
dprintk(1, KERN_INFO "%s: status=0x%02x (no signal)\n",
I2C_NAME(client), status);
return decoder->norm; // no change
}
if ((status & 3) == 0) {
saa7110_write(client, 0x06, 0x83);
if (status & 0x20) {
dprintk(1,
KERN_INFO
"%s: status=0x%02x (NTSC/no color)\n",
I2C_NAME(client), status);
//saa7110_write(client,0x2E,0x81);
return VIDEO_MODE_NTSC;
}
dprintk(1, KERN_INFO "%s: status=0x%02x (PAL/no color)\n",
I2C_NAME(client), status);
//saa7110_write(client,0x2E,0x9A);
return VIDEO_MODE_PAL;
}
//saa7110_write(client,0x06,0x03);
if (status & 0x20) { /* 60Hz */
dprintk(1, KERN_INFO "%s: status=0x%02x (NTSC)\n",
I2C_NAME(client), status);
saa7110_write(client, 0x0D, 0x86);
saa7110_write(client, 0x0F, 0x50);
saa7110_write(client, 0x11, 0x2C);
//saa7110_write(client,0x2E,0x81);
return VIDEO_MODE_NTSC;
}
/* 50Hz -> PAL/SECAM */
saa7110_write(client, 0x0D, 0x86);
saa7110_write(client, 0x0F, 0x10);
saa7110_write(client, 0x11, 0x59);
//saa7110_write(client,0x2E,0x9A);
prepare_to_wait(&decoder->wq, &wait, TASK_UNINTERRUPTIBLE);
schedule_timeout(HZ/4);
finish_wait(&decoder->wq, &wait);
status = saa7110_read(client);
if ((status & 0x03) == 0x01) {
dprintk(1, KERN_INFO "%s: status=0x%02x (SECAM)\n",
I2C_NAME(client), status);
saa7110_write(client, 0x0D, 0x87);
return VIDEO_MODE_SECAM;
}
dprintk(1, KERN_INFO "%s: status=0x%02x (PAL)\n", I2C_NAME(client),
status);
return VIDEO_MODE_PAL;
}
static int
saa7110_command (struct i2c_client *client,
unsigned int cmd,
void *arg)
{
struct saa7110 *decoder = i2c_get_clientdata(client);
int v;
switch (cmd) {
case 0:
//saa7110_write_block(client, initseq, sizeof(initseq));
break;
case DECODER_GET_CAPABILITIES:
{
struct video_decoder_capability *dc = arg;
dc->flags =
VIDEO_DECODER_PAL | VIDEO_DECODER_NTSC |
VIDEO_DECODER_SECAM | VIDEO_DECODER_AUTO;
dc->inputs = SAA7110_MAX_INPUT;
dc->outputs = SAA7110_MAX_OUTPUT;
}
break;
case DECODER_GET_STATUS:
{
int status;
int res = 0;
status = saa7110_read(client);
dprintk(1, KERN_INFO "%s: status=0x%02x norm=%d\n",
I2C_NAME(client), status, decoder->norm);
if (!(status & 0x40))
res |= DECODER_STATUS_GOOD;
if (status & 0x03)
res |= DECODER_STATUS_COLOR;
switch (decoder->norm) {
case VIDEO_MODE_NTSC:
res |= DECODER_STATUS_NTSC;
break;
case VIDEO_MODE_PAL:
res |= DECODER_STATUS_PAL;
break;
case VIDEO_MODE_SECAM:
res |= DECODER_STATUS_SECAM;
break;
}
*(int *) arg = res;
}
break;
case DECODER_SET_NORM:
v = *(int *) arg;
if (decoder->norm != v) {
decoder->norm = v;
//saa7110_write(client, 0x06, 0x03);
switch (v) {
case VIDEO_MODE_NTSC:
saa7110_write(client, 0x0D, 0x86);
saa7110_write(client, 0x0F, 0x50);
saa7110_write(client, 0x11, 0x2C);
//saa7110_write(client, 0x2E, 0x81);
dprintk(1,
KERN_INFO "%s: switched to NTSC\n",
I2C_NAME(client));
break;
case VIDEO_MODE_PAL:
saa7110_write(client, 0x0D, 0x86);
saa7110_write(client, 0x0F, 0x10);
saa7110_write(client, 0x11, 0x59);
//saa7110_write(client, 0x2E, 0x9A);
dprintk(1,
KERN_INFO "%s: switched to PAL\n",
I2C_NAME(client));
break;
case VIDEO_MODE_SECAM:
saa7110_write(client, 0x0D, 0x87);
saa7110_write(client, 0x0F, 0x10);
saa7110_write(client, 0x11, 0x59);
//saa7110_write(client, 0x2E, 0x9A);
dprintk(1,
KERN_INFO
"%s: switched to SECAM\n",
I2C_NAME(client));
break;
case VIDEO_MODE_AUTO:
dprintk(1,
KERN_INFO
"%s: TV standard detection...\n",
I2C_NAME(client));
decoder->norm = determine_norm(client);
*(int *) arg = decoder->norm;
break;
default:
return -EPERM;
}
}
break;
case DECODER_SET_INPUT:
v = *(int *) arg;
if (v < 0 || v > SAA7110_MAX_INPUT) {
dprintk(1,
KERN_INFO "%s: input=%d not available\n",
I2C_NAME(client), v);
return -EINVAL;
}
if (decoder->input != v) {
saa7110_selmux(client, v);
dprintk(1, KERN_INFO "%s: switched to input=%d\n",
I2C_NAME(client), v);
}
break;
case DECODER_SET_OUTPUT:
v = *(int *) arg;
/* not much choice of outputs */
if (v != 0)
return -EINVAL;
break;
case DECODER_ENABLE_OUTPUT:
v = *(int *) arg;
if (decoder->enable != v) {
decoder->enable = v;
saa7110_write(client, 0x0E, v ? 0x18 : 0x80);
dprintk(1, KERN_INFO "%s: YUV %s\n", I2C_NAME(client),
v ? "on" : "off");
}
break;
case DECODER_SET_PICTURE:
{
struct video_picture *pic = arg;
if (decoder->bright != pic->brightness) {
/* We want 0 to 255 we get 0-65535 */
decoder->bright = pic->brightness;
saa7110_write(client, 0x19, decoder->bright >> 8);
}
if (decoder->contrast != pic->contrast) {
/* We want 0 to 127 we get 0-65535 */
decoder->contrast = pic->contrast;
saa7110_write(client, 0x13,
decoder->contrast >> 9);
}
if (decoder->sat != pic->colour) {
/* We want 0 to 127 we get 0-65535 */
decoder->sat = pic->colour;
saa7110_write(client, 0x12, decoder->sat >> 9);
}
if (decoder->hue != pic->hue) {
/* We want -128 to 127 we get 0-65535 */
decoder->hue = pic->hue;
saa7110_write(client, 0x07,
(decoder->hue >> 8) - 128);
}
}
break;
case DECODER_DUMP:
for (v = 0; v < 0x34; v += 16) {
int j;
dprintk(1, KERN_INFO "%s: %03x\n", I2C_NAME(client),
v);
for (j = 0; j < 16; j++) {
dprintk(1, KERN_INFO " %02x",
decoder->reg[v + j]);
}
dprintk(1, KERN_INFO "\n");
}
break;
default:
dprintk(1, KERN_INFO "unknown saa7110_command??(%d)\n",
cmd);
return -EINVAL;
}
return 0;
}
/* ----------------------------------------------------------------------- */
/*
* Generic i2c probe
* concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
*/
static unsigned short normal_i2c[] = {
I2C_SAA7110 >> 1,
(I2C_SAA7110 >> 1) + 1,
I2C_CLIENT_END
};
static unsigned short probe[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
static unsigned short ignore[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
static unsigned short force[2] = { I2C_CLIENT_END , I2C_CLIENT_END };
static struct i2c_client_address_data addr_data = {
.normal_i2c = normal_i2c,
.probe = probe,
.ignore = ignore,
.force = force
};
static struct i2c_driver i2c_driver_saa7110;
static int
saa7110_detect_client (struct i2c_adapter *adapter,
int address,
int kind)
{
struct i2c_client *client;
struct saa7110 *decoder;
int rv;
dprintk(1,
KERN_INFO
"saa7110.c: detecting saa7110 client on address 0x%x\n",
address << 1);
/* Check if the adapter supports the needed features */
if (!i2c_check_functionality
(adapter,
I2C_FUNC_SMBUS_READ_BYTE | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
return 0;
client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
if (client == 0)
return -ENOMEM;
memset(client, 0, sizeof(struct i2c_client));
client->addr = address;
client->adapter = adapter;
client->driver = &i2c_driver_saa7110;
client->flags = I2C_CLIENT_ALLOW_USE;
strlcpy(I2C_NAME(client), "saa7110", sizeof(I2C_NAME(client)));
decoder = kmalloc(sizeof(struct saa7110), GFP_KERNEL);
if (decoder == 0) {
kfree(client);
return -ENOMEM;
}
memset(decoder, 0, sizeof(struct saa7110));
decoder->norm = VIDEO_MODE_PAL;
decoder->input = 0;
decoder->enable = 1;
decoder->bright = 32768;
decoder->contrast = 32768;
decoder->hue = 32768;
decoder->sat = 32768;
init_waitqueue_head(&decoder->wq);
i2c_set_clientdata(client, decoder);
rv = i2c_attach_client(client);
if (rv) {
kfree(client);
kfree(decoder);
return rv;
}
rv = saa7110_write_block(client, initseq, sizeof(initseq));
if (rv < 0)
dprintk(1, KERN_ERR "%s_attach: init status %d\n",
I2C_NAME(client), rv);
else {
int ver, status;
saa7110_write(client, 0x21, 0x10);
saa7110_write(client, 0x0e, 0x18);
saa7110_write(client, 0x0D, 0x04);
ver = saa7110_read(client);
saa7110_write(client, 0x0D, 0x06);
//mdelay(150);
status = saa7110_read(client);
dprintk(1,
KERN_INFO
"%s_attach: SAA7110A version %x at 0x%02x, status=0x%02x\n",
I2C_NAME(client), ver, client->addr << 1, status);
saa7110_write(client, 0x0D, 0x86);
saa7110_write(client, 0x0F, 0x10);
saa7110_write(client, 0x11, 0x59);
//saa7110_write(client, 0x2E, 0x9A);
}
//saa7110_selmux(client,0);
//determine_norm(client);
/* setup and implicit mode 0 select has been performed */
return 0;
}
static int
saa7110_attach_adapter (struct i2c_adapter *adapter)
{
dprintk(1,
KERN_INFO
"saa7110.c: starting probe for adapter %s (0x%x)\n",
I2C_NAME(adapter), adapter->id);
return i2c_probe(adapter, &addr_data, &saa7110_detect_client);
}
static int
saa7110_detach_client (struct i2c_client *client)
{
struct saa7110 *decoder = i2c_get_clientdata(client);
int err;
err = i2c_detach_client(client);
if (err) {
return err;
}
kfree(decoder);
kfree(client);
return 0;
}
/* ----------------------------------------------------------------------- */
static struct i2c_driver i2c_driver_saa7110 = {
.owner = THIS_MODULE,
.name = "saa7110",
.id = I2C_DRIVERID_SAA7110,
.flags = I2C_DF_NOTIFY,
.attach_adapter = saa7110_attach_adapter,
.detach_client = saa7110_detach_client,
.command = saa7110_command,
};
static int __init
saa7110_init (void)
{
return i2c_add_driver(&i2c_driver_saa7110);
}
static void __exit
saa7110_exit (void)
{
i2c_del_driver(&i2c_driver_saa7110);
}
module_init(saa7110_init);
module_exit(saa7110_exit);
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