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linux/drivers/media/common/tuners/tda18271-common.c
Michael Krufky 1724c8fa7e V4L/DVB (13214): tda18271: allow for i2c buses that cant send 16 bytes at once 
There is already an option for sending 16 byte chunks rather that writing
39 bytes all at once during the tuner's initialization.  Some i2c buses
can't send 16 bytes at once, so create an option for sending 8 byte chunks.

Signed-off-by: Michael Krufky <mkrufky@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2009-12-05 18:40:55 -02:00

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/*
tda18271-common.c - driver for the Philips / NXP TDA18271 silicon tuner
Copyright (C) 2007, 2008 Michael Krufky <mkrufky@linuxtv.org>
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 "tda18271-priv.h"
static int tda18271_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
{
struct tda18271_priv *priv = fe->tuner_priv;
enum tda18271_i2c_gate gate;
int ret = 0;
switch (priv->gate) {
case TDA18271_GATE_DIGITAL:
case TDA18271_GATE_ANALOG:
gate = priv->gate;
break;
case TDA18271_GATE_AUTO:
default:
switch (priv->mode) {
case TDA18271_DIGITAL:
gate = TDA18271_GATE_DIGITAL;
break;
case TDA18271_ANALOG:
default:
gate = TDA18271_GATE_ANALOG;
break;
}
}
switch (gate) {
case TDA18271_GATE_ANALOG:
if (fe->ops.analog_ops.i2c_gate_ctrl)
ret = fe->ops.analog_ops.i2c_gate_ctrl(fe, enable);
break;
case TDA18271_GATE_DIGITAL:
if (fe->ops.i2c_gate_ctrl)
ret = fe->ops.i2c_gate_ctrl(fe, enable);
break;
default:
ret = -EINVAL;
break;
}
return ret;
};
/*---------------------------------------------------------------------*/
static void tda18271_dump_regs(struct dvb_frontend *fe, int extended)
{
struct tda18271_priv *priv = fe->tuner_priv;
unsigned char *regs = priv->tda18271_regs;
tda_reg("=== TDA18271 REG DUMP ===\n");
tda_reg("ID_BYTE = 0x%02x\n", 0xff & regs[R_ID]);
tda_reg("THERMO_BYTE = 0x%02x\n", 0xff & regs[R_TM]);
tda_reg("POWER_LEVEL_BYTE = 0x%02x\n", 0xff & regs[R_PL]);
tda_reg("EASY_PROG_BYTE_1 = 0x%02x\n", 0xff & regs[R_EP1]);
tda_reg("EASY_PROG_BYTE_2 = 0x%02x\n", 0xff & regs[R_EP2]);
tda_reg("EASY_PROG_BYTE_3 = 0x%02x\n", 0xff & regs[R_EP3]);
tda_reg("EASY_PROG_BYTE_4 = 0x%02x\n", 0xff & regs[R_EP4]);
tda_reg("EASY_PROG_BYTE_5 = 0x%02x\n", 0xff & regs[R_EP5]);
tda_reg("CAL_POST_DIV_BYTE = 0x%02x\n", 0xff & regs[R_CPD]);
tda_reg("CAL_DIV_BYTE_1 = 0x%02x\n", 0xff & regs[R_CD1]);
tda_reg("CAL_DIV_BYTE_2 = 0x%02x\n", 0xff & regs[R_CD2]);
tda_reg("CAL_DIV_BYTE_3 = 0x%02x\n", 0xff & regs[R_CD3]);
tda_reg("MAIN_POST_DIV_BYTE = 0x%02x\n", 0xff & regs[R_MPD]);
tda_reg("MAIN_DIV_BYTE_1 = 0x%02x\n", 0xff & regs[R_MD1]);
tda_reg("MAIN_DIV_BYTE_2 = 0x%02x\n", 0xff & regs[R_MD2]);
tda_reg("MAIN_DIV_BYTE_3 = 0x%02x\n", 0xff & regs[R_MD3]);
/* only dump extended regs if DBG_ADV is set */
if (!(tda18271_debug & DBG_ADV))
return;
/* W indicates write-only registers.
* Register dump for write-only registers shows last value written. */
tda_reg("EXTENDED_BYTE_1 = 0x%02x\n", 0xff & regs[R_EB1]);
tda_reg("EXTENDED_BYTE_2 = 0x%02x\n", 0xff & regs[R_EB2]);
tda_reg("EXTENDED_BYTE_3 = 0x%02x\n", 0xff & regs[R_EB3]);
tda_reg("EXTENDED_BYTE_4 = 0x%02x\n", 0xff & regs[R_EB4]);
tda_reg("EXTENDED_BYTE_5 = 0x%02x\n", 0xff & regs[R_EB5]);
tda_reg("EXTENDED_BYTE_6 = 0x%02x\n", 0xff & regs[R_EB6]);
tda_reg("EXTENDED_BYTE_7 = 0x%02x\n", 0xff & regs[R_EB7]);
tda_reg("EXTENDED_BYTE_8 = 0x%02x\n", 0xff & regs[R_EB8]);
tda_reg("EXTENDED_BYTE_9 W = 0x%02x\n", 0xff & regs[R_EB9]);
tda_reg("EXTENDED_BYTE_10 = 0x%02x\n", 0xff & regs[R_EB10]);
tda_reg("EXTENDED_BYTE_11 = 0x%02x\n", 0xff & regs[R_EB11]);
tda_reg("EXTENDED_BYTE_12 = 0x%02x\n", 0xff & regs[R_EB12]);
tda_reg("EXTENDED_BYTE_13 = 0x%02x\n", 0xff & regs[R_EB13]);
tda_reg("EXTENDED_BYTE_14 = 0x%02x\n", 0xff & regs[R_EB14]);
tda_reg("EXTENDED_BYTE_15 = 0x%02x\n", 0xff & regs[R_EB15]);
tda_reg("EXTENDED_BYTE_16 W = 0x%02x\n", 0xff & regs[R_EB16]);
tda_reg("EXTENDED_BYTE_17 W = 0x%02x\n", 0xff & regs[R_EB17]);
tda_reg("EXTENDED_BYTE_18 = 0x%02x\n", 0xff & regs[R_EB18]);
tda_reg("EXTENDED_BYTE_19 W = 0x%02x\n", 0xff & regs[R_EB19]);
tda_reg("EXTENDED_BYTE_20 W = 0x%02x\n", 0xff & regs[R_EB20]);
tda_reg("EXTENDED_BYTE_21 = 0x%02x\n", 0xff & regs[R_EB21]);
tda_reg("EXTENDED_BYTE_22 = 0x%02x\n", 0xff & regs[R_EB22]);
tda_reg("EXTENDED_BYTE_23 = 0x%02x\n", 0xff & regs[R_EB23]);
}
int tda18271_read_regs(struct dvb_frontend *fe)
{
struct tda18271_priv *priv = fe->tuner_priv;
unsigned char *regs = priv->tda18271_regs;
unsigned char buf = 0x00;
int ret;
struct i2c_msg msg[] = {
{ .addr = priv->i2c_props.addr, .flags = 0,
.buf = &buf, .len = 1 },
{ .addr = priv->i2c_props.addr, .flags = I2C_M_RD,
.buf = regs, .len = 16 }
};
tda18271_i2c_gate_ctrl(fe, 1);
/* read all registers */
ret = i2c_transfer(priv->i2c_props.adap, msg, 2);
tda18271_i2c_gate_ctrl(fe, 0);
if (ret != 2)
tda_err("ERROR: i2c_transfer returned: %d\n", ret);
if (tda18271_debug & DBG_REG)
tda18271_dump_regs(fe, 0);
return (ret == 2 ? 0 : ret);
}
int tda18271_read_extended(struct dvb_frontend *fe)
{
struct tda18271_priv *priv = fe->tuner_priv;
unsigned char *regs = priv->tda18271_regs;
unsigned char regdump[TDA18271_NUM_REGS];
unsigned char buf = 0x00;
int ret, i;
struct i2c_msg msg[] = {
{ .addr = priv->i2c_props.addr, .flags = 0,
.buf = &buf, .len = 1 },
{ .addr = priv->i2c_props.addr, .flags = I2C_M_RD,
.buf = regdump, .len = TDA18271_NUM_REGS }
};
tda18271_i2c_gate_ctrl(fe, 1);
/* read all registers */
ret = i2c_transfer(priv->i2c_props.adap, msg, 2);
tda18271_i2c_gate_ctrl(fe, 0);
if (ret != 2)
tda_err("ERROR: i2c_transfer returned: %d\n", ret);
for (i = 0; i < TDA18271_NUM_REGS; i++) {
/* don't update write-only registers */
if ((i != R_EB9) &&
(i != R_EB16) &&
(i != R_EB17) &&
(i != R_EB19) &&
(i != R_EB20))
regs[i] = regdump[i];
}
if (tda18271_debug & DBG_REG)
tda18271_dump_regs(fe, 1);
return (ret == 2 ? 0 : ret);
}
int tda18271_write_regs(struct dvb_frontend *fe, int idx, int len)
{
struct tda18271_priv *priv = fe->tuner_priv;
unsigned char *regs = priv->tda18271_regs;
unsigned char buf[TDA18271_NUM_REGS + 1];
struct i2c_msg msg = { .addr = priv->i2c_props.addr, .flags = 0,
.buf = buf, .len = len + 1 };
int i, ret;
BUG_ON((len == 0) || (idx + len > sizeof(buf)));
buf[0] = idx;
for (i = 1; i <= len; i++)
buf[i] = regs[idx - 1 + i];
tda18271_i2c_gate_ctrl(fe, 1);
/* write registers */
ret = i2c_transfer(priv->i2c_props.adap, &msg, 1);
tda18271_i2c_gate_ctrl(fe, 0);
if (ret != 1)
tda_err("ERROR: idx = 0x%x, len = %d, "
"i2c_transfer returned: %d\n", idx, len, ret);
return (ret == 1 ? 0 : ret);
}
/*---------------------------------------------------------------------*/
int tda18271_charge_pump_source(struct dvb_frontend *fe,
enum tda18271_pll pll, int force)
{
struct tda18271_priv *priv = fe->tuner_priv;
unsigned char *regs = priv->tda18271_regs;
int r_cp = (pll == TDA18271_CAL_PLL) ? R_EB7 : R_EB4;
regs[r_cp] &= ~0x20;
regs[r_cp] |= ((force & 1) << 5);
return tda18271_write_regs(fe, r_cp, 1);
}
int tda18271_init_regs(struct dvb_frontend *fe)
{
struct tda18271_priv *priv = fe->tuner_priv;
unsigned char *regs = priv->tda18271_regs;
tda_dbg("initializing registers for device @ %d-%04x\n",
i2c_adapter_id(priv->i2c_props.adap),
priv->i2c_props.addr);
/* initialize registers */
switch (priv->id) {
case TDA18271HDC1:
regs[R_ID] = 0x83;
break;
case TDA18271HDC2:
regs[R_ID] = 0x84;
break;
};
regs[R_TM] = 0x08;
regs[R_PL] = 0x80;
regs[R_EP1] = 0xc6;
regs[R_EP2] = 0xdf;
regs[R_EP3] = 0x16;
regs[R_EP4] = 0x60;
regs[R_EP5] = 0x80;
regs[R_CPD] = 0x80;
regs[R_CD1] = 0x00;
regs[R_CD2] = 0x00;
regs[R_CD3] = 0x00;
regs[R_MPD] = 0x00;
regs[R_MD1] = 0x00;
regs[R_MD2] = 0x00;
regs[R_MD3] = 0x00;
switch (priv->id) {
case TDA18271HDC1:
regs[R_EB1] = 0xff;
break;
case TDA18271HDC2:
regs[R_EB1] = 0xfc;
break;
};
regs[R_EB2] = 0x01;
regs[R_EB3] = 0x84;
regs[R_EB4] = 0x41;
regs[R_EB5] = 0x01;
regs[R_EB6] = 0x84;
regs[R_EB7] = 0x40;
regs[R_EB8] = 0x07;
regs[R_EB9] = 0x00;
regs[R_EB10] = 0x00;
regs[R_EB11] = 0x96;
switch (priv->id) {
case TDA18271HDC1:
regs[R_EB12] = 0x0f;
break;
case TDA18271HDC2:
regs[R_EB12] = 0x33;
break;
};
regs[R_EB13] = 0xc1;
regs[R_EB14] = 0x00;
regs[R_EB15] = 0x8f;
regs[R_EB16] = 0x00;
regs[R_EB17] = 0x00;
switch (priv->id) {
case TDA18271HDC1:
regs[R_EB18] = 0x00;
break;
case TDA18271HDC2:
regs[R_EB18] = 0x8c;
break;
};
regs[R_EB19] = 0x00;
regs[R_EB20] = 0x20;
switch (priv->id) {
case TDA18271HDC1:
regs[R_EB21] = 0x33;
break;
case TDA18271HDC2:
regs[R_EB21] = 0xb3;
break;
};
regs[R_EB22] = 0x48;
regs[R_EB23] = 0xb0;
switch (priv->small_i2c) {
case TDA18271_08_BYTE_CHUNK_INIT:
tda18271_write_regs(fe, 0x00, 0x08);
tda18271_write_regs(fe, 0x08, 0x08);
tda18271_write_regs(fe, 0x10, 0x08);
tda18271_write_regs(fe, 0x18, 0x08);
tda18271_write_regs(fe, 0x20, 0x07);
break;
case TDA18271_16_BYTE_CHUNK_INIT:
tda18271_write_regs(fe, 0x00, 0x10);
tda18271_write_regs(fe, 0x10, 0x10);
tda18271_write_regs(fe, 0x20, 0x07);
break;
case TDA18271_39_BYTE_CHUNK_INIT:
default:
tda18271_write_regs(fe, 0x00, TDA18271_NUM_REGS);
break;
}
/* setup agc1 gain */
regs[R_EB17] = 0x00;
tda18271_write_regs(fe, R_EB17, 1);
regs[R_EB17] = 0x03;
tda18271_write_regs(fe, R_EB17, 1);
regs[R_EB17] = 0x43;
tda18271_write_regs(fe, R_EB17, 1);
regs[R_EB17] = 0x4c;
tda18271_write_regs(fe, R_EB17, 1);
/* setup agc2 gain */
if ((priv->id) == TDA18271HDC1) {
regs[R_EB20] = 0xa0;
tda18271_write_regs(fe, R_EB20, 1);
regs[R_EB20] = 0xa7;
tda18271_write_regs(fe, R_EB20, 1);
regs[R_EB20] = 0xe7;
tda18271_write_regs(fe, R_EB20, 1);
regs[R_EB20] = 0xec;
tda18271_write_regs(fe, R_EB20, 1);
}
/* image rejection calibration */
/* low-band */
regs[R_EP3] = 0x1f;
regs[R_EP4] = 0x66;
regs[R_EP5] = 0x81;
regs[R_CPD] = 0xcc;
regs[R_CD1] = 0x6c;
regs[R_CD2] = 0x00;
regs[R_CD3] = 0x00;
regs[R_MPD] = 0xcd;
regs[R_MD1] = 0x77;
regs[R_MD2] = 0x08;
regs[R_MD3] = 0x00;
tda18271_write_regs(fe, R_EP3, 11);
if ((priv->id) == TDA18271HDC2) {
/* main pll cp source on */
tda18271_charge_pump_source(fe, TDA18271_MAIN_PLL, 1);
msleep(1);
/* main pll cp source off */
tda18271_charge_pump_source(fe, TDA18271_MAIN_PLL, 0);
}
msleep(5); /* pll locking */
/* launch detector */
tda18271_write_regs(fe, R_EP1, 1);
msleep(5); /* wanted low measurement */
regs[R_EP5] = 0x85;
regs[R_CPD] = 0xcb;
regs[R_CD1] = 0x66;
regs[R_CD2] = 0x70;
tda18271_write_regs(fe, R_EP3, 7);
msleep(5); /* pll locking */
/* launch optimization algorithm */
tda18271_write_regs(fe, R_EP2, 1);
msleep(30); /* image low optimization completion */
/* mid-band */
regs[R_EP5] = 0x82;
regs[R_CPD] = 0xa8;
regs[R_CD2] = 0x00;
regs[R_MPD] = 0xa9;
regs[R_MD1] = 0x73;
regs[R_MD2] = 0x1a;
tda18271_write_regs(fe, R_EP3, 11);
msleep(5); /* pll locking */
/* launch detector */
tda18271_write_regs(fe, R_EP1, 1);
msleep(5); /* wanted mid measurement */
regs[R_EP5] = 0x86;
regs[R_CPD] = 0xa8;
regs[R_CD1] = 0x66;
regs[R_CD2] = 0xa0;
tda18271_write_regs(fe, R_EP3, 7);
msleep(5); /* pll locking */
/* launch optimization algorithm */
tda18271_write_regs(fe, R_EP2, 1);
msleep(30); /* image mid optimization completion */
/* high-band */
regs[R_EP5] = 0x83;
regs[R_CPD] = 0x98;
regs[R_CD1] = 0x65;
regs[R_CD2] = 0x00;
regs[R_MPD] = 0x99;
regs[R_MD1] = 0x71;
regs[R_MD2] = 0xcd;
tda18271_write_regs(fe, R_EP3, 11);
msleep(5); /* pll locking */
/* launch detector */
tda18271_write_regs(fe, R_EP1, 1);
msleep(5); /* wanted high measurement */
regs[R_EP5] = 0x87;
regs[R_CD1] = 0x65;
regs[R_CD2] = 0x50;
tda18271_write_regs(fe, R_EP3, 7);
msleep(5); /* pll locking */
/* launch optimization algorithm */
tda18271_write_regs(fe, R_EP2, 1);
msleep(30); /* image high optimization completion */
/* return to normal mode */
regs[R_EP4] = 0x64;
tda18271_write_regs(fe, R_EP4, 1);
/* synchronize */
tda18271_write_regs(fe, R_EP1, 1);
return 0;
}
/*---------------------------------------------------------------------*/
/*
* Standby modes, EP3 [7:5]
*
* | SM || SM_LT || SM_XT || mode description
* |=====\\=======\\=======\\===================================
* | 0 || 0 || 0 || normal mode
* |-----||-------||-------||-----------------------------------
* | || || || standby mode w/ slave tuner output
* | 1 || 0 || 0 || & loop thru & xtal oscillator on
* |-----||-------||-------||-----------------------------------
* | 1 || 1 || 0 || standby mode w/ xtal oscillator on
* |-----||-------||-------||-----------------------------------
* | 1 || 1 || 1 || power off
*
*/
int tda18271_set_standby_mode(struct dvb_frontend *fe,
int sm, int sm_lt, int sm_xt)
{
struct tda18271_priv *priv = fe->tuner_priv;
unsigned char *regs = priv->tda18271_regs;
if (tda18271_debug & DBG_ADV)
tda_dbg("sm = %d, sm_lt = %d, sm_xt = %d\n", sm, sm_lt, sm_xt);
regs[R_EP3] &= ~0xe0; /* clear sm, sm_lt, sm_xt */
regs[R_EP3] |= (sm ? (1 << 7) : 0) |
(sm_lt ? (1 << 6) : 0) |
(sm_xt ? (1 << 5) : 0);
return tda18271_write_regs(fe, R_EP3, 1);
}
/*---------------------------------------------------------------------*/
int tda18271_calc_main_pll(struct dvb_frontend *fe, u32 freq)
{
/* sets main post divider & divider bytes, but does not write them */
struct tda18271_priv *priv = fe->tuner_priv;
unsigned char *regs = priv->tda18271_regs;
u8 d, pd;
u32 div;
int ret = tda18271_lookup_pll_map(fe, MAIN_PLL, &freq, &pd, &d);
if (tda_fail(ret))
goto fail;
regs[R_MPD] = (0x77 & pd);
switch (priv->mode) {
case TDA18271_ANALOG:
regs[R_MPD] &= ~0x08;
break;
case TDA18271_DIGITAL:
regs[R_MPD] |= 0x08;
break;
}
div = ((d * (freq / 1000)) << 7) / 125;
regs[R_MD1] = 0x7f & (div >> 16);
regs[R_MD2] = 0xff & (div >> 8);
regs[R_MD3] = 0xff & div;
fail:
return ret;
}
int tda18271_calc_cal_pll(struct dvb_frontend *fe, u32 freq)
{
/* sets cal post divider & divider bytes, but does not write them */
struct tda18271_priv *priv = fe->tuner_priv;
unsigned char *regs = priv->tda18271_regs;
u8 d, pd;
u32 div;
int ret = tda18271_lookup_pll_map(fe, CAL_PLL, &freq, &pd, &d);
if (tda_fail(ret))
goto fail;
regs[R_CPD] = pd;
div = ((d * (freq / 1000)) << 7) / 125;
regs[R_CD1] = 0x7f & (div >> 16);
regs[R_CD2] = 0xff & (div >> 8);
regs[R_CD3] = 0xff & div;
fail:
return ret;
}
/*---------------------------------------------------------------------*/
int tda18271_calc_bp_filter(struct dvb_frontend *fe, u32 *freq)
{
/* sets bp filter bits, but does not write them */
struct tda18271_priv *priv = fe->tuner_priv;
unsigned char *regs = priv->tda18271_regs;
u8 val;
int ret = tda18271_lookup_map(fe, BP_FILTER, freq, &val);
if (tda_fail(ret))
goto fail;
regs[R_EP1] &= ~0x07; /* clear bp filter bits */
regs[R_EP1] |= (0x07 & val);
fail:
return ret;
}
int tda18271_calc_km(struct dvb_frontend *fe, u32 *freq)
{
/* sets K & M bits, but does not write them */
struct tda18271_priv *priv = fe->tuner_priv;
unsigned char *regs = priv->tda18271_regs;
u8 val;
int ret = tda18271_lookup_map(fe, RF_CAL_KMCO, freq, &val);
if (tda_fail(ret))
goto fail;
regs[R_EB13] &= ~0x7c; /* clear k & m bits */
regs[R_EB13] |= (0x7c & val);
fail:
return ret;
}
int tda18271_calc_rf_band(struct dvb_frontend *fe, u32 *freq)
{
/* sets rf band bits, but does not write them */
struct tda18271_priv *priv = fe->tuner_priv;
unsigned char *regs = priv->tda18271_regs;
u8 val;
int ret = tda18271_lookup_map(fe, RF_BAND, freq, &val);
if (tda_fail(ret))
goto fail;
regs[R_EP2] &= ~0xe0; /* clear rf band bits */
regs[R_EP2] |= (0xe0 & (val << 5));
fail:
return ret;
}
int tda18271_calc_gain_taper(struct dvb_frontend *fe, u32 *freq)
{
/* sets gain taper bits, but does not write them */
struct tda18271_priv *priv = fe->tuner_priv;
unsigned char *regs = priv->tda18271_regs;
u8 val;
int ret = tda18271_lookup_map(fe, GAIN_TAPER, freq, &val);
if (tda_fail(ret))
goto fail;
regs[R_EP2] &= ~0x1f; /* clear gain taper bits */
regs[R_EP2] |= (0x1f & val);
fail:
return ret;
}
int tda18271_calc_ir_measure(struct dvb_frontend *fe, u32 *freq)
{
/* sets IR Meas bits, but does not write them */
struct tda18271_priv *priv = fe->tuner_priv;
unsigned char *regs = priv->tda18271_regs;
u8 val;
int ret = tda18271_lookup_map(fe, IR_MEASURE, freq, &val);
if (tda_fail(ret))
goto fail;
regs[R_EP5] &= ~0x07;
regs[R_EP5] |= (0x07 & val);
fail:
return ret;
}
int tda18271_calc_rf_cal(struct dvb_frontend *fe, u32 *freq)
{
/* sets rf cal byte (RFC_Cprog), but does not write it */
struct tda18271_priv *priv = fe->tuner_priv;
unsigned char *regs = priv->tda18271_regs;
u8 val;
int ret = tda18271_lookup_map(fe, RF_CAL, freq, &val);
/* The TDA18271HD/C1 rf_cal map lookup is expected to go out of range
* for frequencies above 61.1 MHz. In these cases, the internal RF
* tracking filters calibration mechanism is used.
*
* There is no need to warn the user about this.
*/
if (ret < 0)
goto fail;
regs[R_EB14] = val;
fail:
return ret;
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* ---------------------------------------------------------------------------
* Local variables:
* c-basic-offset: 8
* End:
*/
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