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android_kernel_xiaomi_sm8350/drivers/media/video/tda9887.c
Jean Delvare fae91e72b7 [PATCH] I2C: Drop I2C_DEVNAME and i2c_clientname 
I2C_DEVNAME and i2c_clientname were introduced in 2.5.68 [1] to help
media/video driver authors who wanted their code to be compatible with
both Linux 2.4 and 2.6. The cause of the incompatibility has gone since
[2], so I think we can get rid of them, as they tend to make the code
harder to read and longer to preprocess/compile for no more benefit.

I'd hope nobody seriously attempts to keep media/video driver compatible
across Linux trees anymore, BTW.

[1] http://marc.theaimsgroup.com/?l=linux-kernel&m=104930186524598&w=2
[2] http://www.linuxhq.com/kernel/v2.6/0-test3/include/linux/i2c.h

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-09-05 09:14:35 -07:00

821 lines
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#include <linux/module.h>
#include <linux/moduleparam.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 <linux/delay.h>
#include <media/audiochip.h>
#include <media/tuner.h>
#include <media/id.h>
/* Chips:
TDA9885 (PAL, NTSC)
TDA9886 (PAL, SECAM, NTSC)
TDA9887 (PAL, SECAM, NTSC, FM Radio)
found on:
- Pinnacle PCTV (Jul.2002 Version with MT2032, bttv)
TDA9887 (world), TDA9885 (USA)
Note: OP2 of tda988x must be set to 1, else MT2032 is disabled!
- KNC One TV-Station RDS (saa7134)
*/
/* Addresses to scan */
static unsigned short normal_i2c[] = {
0x84 >>1,
0x86 >>1,
0x96 >>1,
I2C_CLIENT_END,
};
I2C_CLIENT_INSMOD;
/* insmod options */
static unsigned int debug = 0;
module_param(debug, int, 0644);
MODULE_LICENSE("GPL");
/* ---------------------------------------------------------------------- */
#define UNSET (-1U)
#define PREFIX "tda9885/6/7: "
#define dprintk if (debug) printk
struct tda9887 {
struct i2c_client client;
v4l2_std_id std;
unsigned int radio;
unsigned int config;
unsigned int pinnacle_id;
unsigned int using_v4l2;
unsigned int radio_mode;
};
struct tvnorm {
v4l2_std_id std;
char *name;
unsigned char b;
unsigned char c;
unsigned char e;
};
static struct i2c_driver driver;
static struct i2c_client client_template;
/* ---------------------------------------------------------------------- */
//
// TDA defines
//
//// first reg (b)
#define cVideoTrapBypassOFF 0x00 // bit b0
#define cVideoTrapBypassON 0x01 // bit b0
#define cAutoMuteFmInactive 0x00 // bit b1
#define cAutoMuteFmActive 0x02 // bit b1
#define cIntercarrier 0x00 // bit b2
#define cQSS 0x04 // bit b2
#define cPositiveAmTV 0x00 // bit b3:4
#define cFmRadio 0x08 // bit b3:4
#define cNegativeFmTV 0x10 // bit b3:4
#define cForcedMuteAudioON 0x20 // bit b5
#define cForcedMuteAudioOFF 0x00 // bit b5
#define cOutputPort1Active 0x00 // bit b6
#define cOutputPort1Inactive 0x40 // bit b6
#define cOutputPort2Active 0x00 // bit b7
#define cOutputPort2Inactive 0x80 // bit b7
//// second reg (c)
#define cDeemphasisOFF 0x00 // bit c5
#define cDeemphasisON 0x20 // bit c5
#define cDeemphasis75 0x00 // bit c6
#define cDeemphasis50 0x40 // bit c6
#define cAudioGain0 0x00 // bit c7
#define cAudioGain6 0x80 // bit c7
//// third reg (e)
#define cAudioIF_4_5 0x00 // bit e0:1
#define cAudioIF_5_5 0x01 // bit e0:1
#define cAudioIF_6_0 0x02 // bit e0:1
#define cAudioIF_6_5 0x03 // bit e0:1
#define cVideoIF_58_75 0x00 // bit e2:4
#define cVideoIF_45_75 0x04 // bit e2:4
#define cVideoIF_38_90 0x08 // bit e2:4
#define cVideoIF_38_00 0x0C // bit e2:4
#define cVideoIF_33_90 0x10 // bit e2:4
#define cVideoIF_33_40 0x14 // bit e2:4
#define cRadioIF_45_75 0x18 // bit e2:4
#define cRadioIF_38_90 0x1C // bit e2:4
#define cTunerGainNormal 0x00 // bit e5
#define cTunerGainLow 0x20 // bit e5
#define cGating_18 0x00 // bit e6
#define cGating_36 0x40 // bit e6
#define cAgcOutON 0x80 // bit e7
#define cAgcOutOFF 0x00 // bit e7
/* ---------------------------------------------------------------------- */
static struct tvnorm tvnorms[] = {
{
.std = V4L2_STD_PAL_BG,
.name = "PAL-BG",
.b = ( cNegativeFmTV |
cQSS ),
.c = ( cDeemphasisON |
cDeemphasis50 ),
.e = ( cAudioIF_5_5 |
cVideoIF_38_90 ),
},{
.std = V4L2_STD_PAL_I,
.name = "PAL-I",
.b = ( cNegativeFmTV |
cQSS ),
.c = ( cDeemphasisON |
cDeemphasis50 ),
.e = ( cAudioIF_6_0 |
cVideoIF_38_90 ),
},{
.std = V4L2_STD_PAL_DK,
.name = "PAL-DK",
.b = ( cNegativeFmTV |
cQSS ),
.c = ( cDeemphasisON |
cDeemphasis50 ),
.e = ( cAudioIF_6_5 |
cVideoIF_38_00 ),
},{
.std = V4L2_STD_PAL_M | V4L2_STD_PAL_N,
.name = "PAL-M/N",
.b = ( cNegativeFmTV |
cQSS ),
.c = ( cDeemphasisON |
cDeemphasis75 ),
.e = ( cAudioIF_4_5 |
cVideoIF_45_75 ),
},{
.std = V4L2_STD_SECAM_L,
.name = "SECAM-L",
.b = ( cPositiveAmTV |
cQSS ),
.e = ( cAudioIF_6_5 |
cVideoIF_38_90 ),
},{
.std = V4L2_STD_SECAM_DK,
.name = "SECAM-DK",
.b = ( cNegativeFmTV |
cQSS ),
.c = ( cDeemphasisON |
cDeemphasis50 ),
.e = ( cAudioIF_6_5 |
cVideoIF_38_00 ),
},{
.std = V4L2_STD_NTSC_M,
.name = "NTSC-M",
.b = ( cNegativeFmTV |
cQSS ),
.c = ( cDeemphasisON |
cDeemphasis50 ),
.e = ( cGating_36 |
cAudioIF_4_5 |
cVideoIF_45_75 ),
},{
.std = V4L2_STD_NTSC_M_JP,
.name = "NTSC-JP",
.b = ( cNegativeFmTV |
cQSS ),
.c = ( cDeemphasisON |
cDeemphasis50 ),
.e = ( cGating_36 |
cAudioIF_4_5 |
cVideoIF_58_75 ),
}
};
static struct tvnorm radio_stereo = {
.name = "Radio Stereo",
.b = ( cFmRadio |
cQSS ),
.c = ( cDeemphasisOFF |
cAudioGain6 ),
.e = ( cAudioIF_5_5 |
cRadioIF_38_90 ),
};
static struct tvnorm radio_mono = {
.name = "Radio Mono",
.b = ( cFmRadio |
cQSS ),
.c = ( cDeemphasisON |
cDeemphasis50),
.e = ( cAudioIF_5_5 |
cRadioIF_38_90 ),
};
/* ---------------------------------------------------------------------- */
static void dump_read_message(unsigned char *buf)
{
static char *afc[16] = {
"- 12.5 kHz",
"- 37.5 kHz",
"- 62.5 kHz",
"- 87.5 kHz",
"-112.5 kHz",
"-137.5 kHz",
"-162.5 kHz",
"-187.5 kHz [min]",
"+187.5 kHz [max]",
"+162.5 kHz",
"+137.5 kHz",
"+112.5 kHz",
"+ 87.5 kHz",
"+ 62.5 kHz",
"+ 37.5 kHz",
"+ 12.5 kHz",
};
printk(PREFIX "read: 0x%2x\n", buf[0]);
printk(" after power on : %s\n", (buf[0] & 0x01) ? "yes" : "no");
printk(" afc : %s\n", afc[(buf[0] >> 1) & 0x0f]);
printk(" fmif level : %s\n", (buf[0] & 0x20) ? "high" : "low");
printk(" afc window : %s\n", (buf[0] & 0x40) ? "in" : "out");
printk(" vfi level : %s\n", (buf[0] & 0x80) ? "high" : "low");
}
static void dump_write_message(unsigned char *buf)
{
static char *sound[4] = {
"AM/TV",
"FM/radio",
"FM/TV",
"FM/radio"
};
static char *adjust[32] = {
"-16", "-15", "-14", "-13", "-12", "-11", "-10", "-9",
"-8", "-7", "-6", "-5", "-4", "-3", "-2", "-1",
"0", "+1", "+2", "+3", "+4", "+5", "+6", "+7",
"+8", "+9", "+10", "+11", "+12", "+13", "+14", "+15"
};
static char *deemph[4] = {
"no", "no", "75", "50"
};
static char *carrier[4] = {
"4.5 MHz",
"5.5 MHz",
"6.0 MHz",
"6.5 MHz / AM"
};
static char *vif[8] = {
"58.75 MHz",
"45.75 MHz",
"38.9 MHz",
"38.0 MHz",
"33.9 MHz",
"33.4 MHz",
"45.75 MHz + pin13",
"38.9 MHz + pin13",
};
static char *rif[4] = {
"44 MHz",
"52 MHz",
"52 MHz",
"44 MHz",
};
printk(PREFIX "write: byte B 0x%02x\n",buf[1]);
printk(" B0 video mode : %s\n",
(buf[1] & 0x01) ? "video trap" : "sound trap");
printk(" B1 auto mute fm : %s\n",
(buf[1] & 0x02) ? "yes" : "no");
printk(" B2 carrier mode : %s\n",
(buf[1] & 0x04) ? "QSS" : "Intercarrier");
printk(" B3-4 tv sound/radio : %s\n",
sound[(buf[1] & 0x18) >> 3]);
printk(" B5 force mute audio: %s\n",
(buf[1] & 0x20) ? "yes" : "no");
printk(" B6 output port 1 : %s\n",
(buf[1] & 0x40) ? "high (inactive)" : "low (active)");
printk(" B7 output port 2 : %s\n",
(buf[1] & 0x80) ? "high (inactive)" : "low (active)");
printk(PREFIX "write: byte C 0x%02x\n",buf[2]);
printk(" C0-4 top adjustment : %s dB\n", adjust[buf[2] & 0x1f]);
printk(" C5-6 de-emphasis : %s\n", deemph[(buf[2] & 0x60) >> 5]);
printk(" C7 audio gain : %s\n",
(buf[2] & 0x80) ? "-6" : "0");
printk(PREFIX "write: byte E 0x%02x\n",buf[3]);
printk(" E0-1 sound carrier : %s\n",
carrier[(buf[3] & 0x03)]);
printk(" E6 l pll ganting : %s\n",
(buf[3] & 0x40) ? "36" : "13");
if (buf[1] & 0x08) {
/* radio */
printk(" E2-4 video if : %s\n",
rif[(buf[3] & 0x0c) >> 2]);
printk(" E7 vif agc output : %s\n",
(buf[3] & 0x80)
? ((buf[3] & 0x10) ? "fm-agc radio" : "sif-agc radio")
: "fm radio carrier afc");
} else {
/* video */
printk(" E2-4 video if : %s\n",
vif[(buf[3] & 0x1c) >> 2]);
printk(" E5 tuner gain : %s\n",
(buf[3] & 0x80)
? ((buf[3] & 0x20) ? "external" : "normal")
: ((buf[3] & 0x20) ? "minimum" : "normal"));
printk(" E7 vif agc output : %s\n",
(buf[3] & 0x80)
? ((buf[3] & 0x20)
? "pin3 port, pin22 vif agc out"
: "pin22 port, pin3 vif acg ext in")
: "pin3+pin22 port");
}
printk("--\n");
}
/* ---------------------------------------------------------------------- */
static int tda9887_set_tvnorm(struct tda9887 *t, char *buf)
{
struct tvnorm *norm = NULL;
int i;
if (t->radio) {
if (t->radio_mode == V4L2_TUNER_MODE_MONO)
norm = &radio_mono;
else
norm = &radio_stereo;
} else {
for (i = 0; i < ARRAY_SIZE(tvnorms); i++) {
if (tvnorms[i].std & t->std) {
norm = tvnorms+i;
break;
}
}
}
if (NULL == norm) {
dprintk(PREFIX "Oops: no tvnorm entry found\n");
return -1;
}
dprintk(PREFIX "configure for: %s\n",norm->name);
buf[1] = norm->b;
buf[2] = norm->c;
buf[3] = norm->e;
return 0;
}
static unsigned int port1 = UNSET;
static unsigned int port2 = UNSET;
static unsigned int qss = UNSET;
static unsigned int adjust = 0x10;
module_param(port1, int, 0644);
module_param(port2, int, 0644);
module_param(qss, int, 0644);
module_param(adjust, int, 0644);
static int tda9887_set_insmod(struct tda9887 *t, char *buf)
{
if (UNSET != port1) {
if (port1)
buf[1] |= cOutputPort1Inactive;
else
buf[1] &= ~cOutputPort1Inactive;
}
if (UNSET != port2) {
if (port2)
buf[1] |= cOutputPort2Inactive;
else
buf[1] &= ~cOutputPort2Inactive;
}
if (UNSET != qss) {
if (qss)
buf[1] |= cQSS;
else
buf[1] &= ~cQSS;
}
if (adjust >= 0x00 && adjust < 0x20)
buf[2] |= adjust;
return 0;
}
static int tda9887_set_config(struct tda9887 *t, char *buf)
{
if (t->config & TDA9887_PORT1_ACTIVE)
buf[1] &= ~cOutputPort1Inactive;
if (t->config & TDA9887_PORT1_INACTIVE)
buf[1] |= cOutputPort1Inactive;
if (t->config & TDA9887_PORT2_ACTIVE)
buf[1] &= ~cOutputPort2Inactive;
if (t->config & TDA9887_PORT2_INACTIVE)
buf[1] |= cOutputPort2Inactive;
if (t->config & TDA9887_QSS)
buf[1] |= cQSS;
if (t->config & TDA9887_INTERCARRIER)
buf[1] &= ~cQSS;
if (t->config & TDA9887_AUTOMUTE)
buf[1] |= cAutoMuteFmActive;
if (t->config & TDA9887_DEEMPHASIS_MASK) {
buf[2] &= ~0x60;
switch (t->config & TDA9887_DEEMPHASIS_MASK) {
case TDA9887_DEEMPHASIS_NONE:
buf[2] |= cDeemphasisOFF;
break;
case TDA9887_DEEMPHASIS_50:
buf[2] |= cDeemphasisON | cDeemphasis50;
break;
case TDA9887_DEEMPHASIS_75:
buf[2] |= cDeemphasisON | cDeemphasis75;
break;
}
}
return 0;
}
/* ---------------------------------------------------------------------- */
static int tda9887_set_pinnacle(struct tda9887 *t, char *buf)
{
unsigned int bCarrierMode = UNSET;
if (t->std & V4L2_STD_625_50) {
if ((1 == t->pinnacle_id) || (7 == t->pinnacle_id)) {
bCarrierMode = cIntercarrier;
} else {
bCarrierMode = cQSS;
}
}
if (t->std & V4L2_STD_525_60) {
if ((5 == t->pinnacle_id) || (6 == t->pinnacle_id)) {
bCarrierMode = cIntercarrier;
} else {
bCarrierMode = cQSS;
}
}
if (bCarrierMode != UNSET) {
buf[1] &= ~0x04;
buf[1] |= bCarrierMode;
}
return 0;
}
/* ---------------------------------------------------------------------- */
static char pal[] = "-";
module_param_string(pal, pal, sizeof(pal), 0644);
static char secam[] = "-";
module_param_string(secam, secam, sizeof(secam), 0644);
static int tda9887_fixup_std(struct tda9887 *t)
{
/* get more precise norm info from insmod option */
if ((t->std & V4L2_STD_PAL) == V4L2_STD_PAL) {
switch (pal[0]) {
case 'b':
case 'B':
case 'g':
case 'G':
dprintk(PREFIX "insmod fixup: PAL => PAL-BG\n");
t->std = V4L2_STD_PAL_BG;
break;
case 'i':
case 'I':
dprintk(PREFIX "insmod fixup: PAL => PAL-I\n");
t->std = V4L2_STD_PAL_I;
break;
case 'd':
case 'D':
case 'k':
case 'K':
dprintk(PREFIX "insmod fixup: PAL => PAL-DK\n");
t->std = V4L2_STD_PAL_DK;
break;
}
}
if ((t->std & V4L2_STD_SECAM) == V4L2_STD_SECAM) {
switch (secam[0]) {
case 'd':
case 'D':
case 'k':
case 'K':
dprintk(PREFIX "insmod fixup: SECAM => SECAM-DK\n");
t->std = V4L2_STD_SECAM_DK;
break;
case 'l':
case 'L':
dprintk(PREFIX "insmod fixup: SECAM => SECAM-L\n");
t->std = V4L2_STD_SECAM_L;
break;
}
}
return 0;
}
static int tda9887_status(struct tda9887 *t)
{
unsigned char buf[1];
int rc;
memset(buf,0,sizeof(buf));
if (1 != (rc = i2c_master_recv(&t->client,buf,1)))
printk(PREFIX "i2c i/o error: rc == %d (should be 1)\n",rc);
dump_read_message(buf);
return 0;
}
static int tda9887_configure(struct tda9887 *t)
{
unsigned char buf[4];
int rc;
memset(buf,0,sizeof(buf));
tda9887_set_tvnorm(t,buf);
buf[1] |= cOutputPort1Inactive;
buf[1] |= cOutputPort2Inactive;
if (UNSET != t->pinnacle_id) {
tda9887_set_pinnacle(t,buf);
}
tda9887_set_config(t,buf);
tda9887_set_insmod(t,buf);
dprintk(PREFIX "writing: b=0x%02x c=0x%02x e=0x%02x\n",
buf[1],buf[2],buf[3]);
if (debug > 1)
dump_write_message(buf);
if (4 != (rc = i2c_master_send(&t->client,buf,4)))
printk(PREFIX "i2c i/o error: rc == %d (should be 4)\n",rc);
if (debug > 2) {
msleep_interruptible(1000);
tda9887_status(t);
}
return 0;
}
/* ---------------------------------------------------------------------- */
static int tda9887_attach(struct i2c_adapter *adap, int addr, int kind)
{
struct tda9887 *t;
client_template.adapter = adap;
client_template.addr = addr;
printk(PREFIX "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->std = 0;
t->pinnacle_id = UNSET;
t->radio_mode = V4L2_TUNER_MODE_STEREO;
i2c_set_clientdata(&t->client, t);
i2c_attach_client(&t->client);
return 0;
}
static int tda9887_probe(struct i2c_adapter *adap)
{
#ifdef I2C_CLASS_TV_ANALOG
if (adap->class & I2C_CLASS_TV_ANALOG)
return i2c_probe(adap, &addr_data, tda9887_attach);
#else
switch (adap->id) {
case I2C_HW_B_BT848:
case I2C_HW_B_RIVA:
case I2C_HW_SAA7134:
return i2c_probe(adap, &addr_data, tda9887_attach);
break;
}
#endif
return 0;
}
static int tda9887_detach(struct i2c_client *client)
{
struct tda9887 *t = i2c_get_clientdata(client);
i2c_detach_client(client);
kfree(t);
return 0;
}
#define SWITCH_V4L2 if (!t->using_v4l2 && debug) \
printk(PREFIX "switching to v4l2\n"); \
t->using_v4l2 = 1;
#define CHECK_V4L2 if (t->using_v4l2) { if (debug) \
printk(PREFIX "ignore v4l1 call\n"); \
return 0; }
static int
tda9887_command(struct i2c_client *client, unsigned int cmd, void *arg)
{
struct tda9887 *t = i2c_get_clientdata(client);
switch (cmd) {
/* --- configuration --- */
case AUDC_SET_RADIO:
t->radio = 1;
tda9887_configure(t);
break;
case AUDC_CONFIG_PINNACLE:
{
int *i = arg;
t->pinnacle_id = *i;
tda9887_configure(t);
break;
}
case TDA9887_SET_CONFIG:
{
int *i = arg;
t->config = *i;
tda9887_configure(t);
break;
}
/* --- v4l ioctls --- */
/* take care: bttv does userspace copying, we'll get a
kernel pointer here... */
case VIDIOCSCHAN:
{
static const v4l2_std_id map[] = {
[ VIDEO_MODE_PAL ] = V4L2_STD_PAL,
[ VIDEO_MODE_NTSC ] = V4L2_STD_NTSC_M,
[ VIDEO_MODE_SECAM ] = V4L2_STD_SECAM,
[ 4 /* bttv */ ] = V4L2_STD_PAL_M,
[ 5 /* bttv */ ] = V4L2_STD_PAL_N,
[ 6 /* bttv */ ] = V4L2_STD_NTSC_M_JP,
};
struct video_channel *vc = arg;
CHECK_V4L2;
t->radio = 0;
if (vc->norm < ARRAY_SIZE(map))
t->std = map[vc->norm];
tda9887_fixup_std(t);
tda9887_configure(t);
break;
}
case VIDIOC_S_STD:
{
v4l2_std_id *id = arg;
SWITCH_V4L2;
t->radio = 0;
t->std = *id;
tda9887_fixup_std(t);
tda9887_configure(t);
break;
}
case VIDIOC_S_FREQUENCY:
{
struct v4l2_frequency *f = arg;
SWITCH_V4L2;
if (V4L2_TUNER_ANALOG_TV == f->type) {
if (t->radio == 0)
return 0;
t->radio = 0;
}
if (V4L2_TUNER_RADIO == f->type) {
if (t->radio == 1)
return 0;
t->radio = 1;
}
tda9887_configure(t);
break;
}
case VIDIOC_G_TUNER:
{
static int AFC_BITS_2_kHz[] = {
-12500, -37500, -62500, -97500,
-112500, -137500, -162500, -187500,
187500, 162500, 137500, 112500,
97500 , 62500, 37500 , 12500
};
struct v4l2_tuner* tuner = arg;
if (t->radio) {
__u8 reg = 0;
tuner->afc=0;
if (1 == i2c_master_recv(&t->client,&reg,1))
tuner->afc = AFC_BITS_2_kHz[(reg>>1)&0x0f];
}
break;
}
case VIDIOC_S_TUNER:
{
struct v4l2_tuner* tuner = arg;
if (t->radio) {
t->radio_mode = tuner->audmode;
tda9887_configure (t);
}
break;
}
default:
/* nothing */
break;
}
return 0;
}
static int tda9887_suspend(struct device * dev, pm_message_t state, u32 level)
{
dprintk("tda9887: suspend\n");
return 0;
}
static int tda9887_resume(struct device * dev, u32 level)
{
struct i2c_client *c = container_of(dev, struct i2c_client, dev);
struct tda9887 *t = i2c_get_clientdata(c);
dprintk("tda9887: resume\n");
tda9887_configure(t);
return 0;
}
/* ----------------------------------------------------------------------- */
static struct i2c_driver driver = {
.owner = THIS_MODULE,
.name = "i2c tda9887 driver",
.id = -1, /* FIXME */
.flags = I2C_DF_NOTIFY,
.attach_adapter = tda9887_probe,
.detach_client = tda9887_detach,
.command = tda9887_command,
.driver = {
.suspend = tda9887_suspend,
.resume = tda9887_resume,
},
};
static struct i2c_client client_template =
{
.name = "tda9887",
.flags = I2C_CLIENT_ALLOW_USE,
.driver = &driver,
};
static int __init tda9887_init_module(void)
{
return i2c_add_driver(&driver);
}
static void __exit tda9887_cleanup_module(void)
{
i2c_del_driver(&driver);
}
module_init(tda9887_init_module);
module_exit(tda9887_cleanup_module);
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* ---------------------------------------------------------------------------
* Local variables:
* c-basic-offset: 8
* End:
*/
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