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linux-sg2042/drivers/media/dvb-frontends/zl10036.c

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/**
* Driver for Zarlink zl10036 DVB-S silicon tuner
*
* Copyright (C) 2006 Tino Reichardt
* Copyright (C) 2007-2009 Matthias Schwarzott <zzam@gentoo.de>
*
* 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.
*
* 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.
*
**
* The data sheet for this tuner can be found at:
* http://www.mcmilk.de/projects/dvb-card/datasheets/ZL10036.pdf
*
* This one is working: (at my Avermedia DVB-S Pro)
* - zl10036 (40pin, FTA)
*
* A driver for zl10038 should be very similar.
*/
#include <linux/module.h>
#include <linux/dvb/frontend.h>
#include <linux/slab.h>
#include <linux/types.h>
#include "zl10036.h"
static int zl10036_debug;
#define dprintk(level, args...) \
do { if (zl10036_debug & level) printk(KERN_DEBUG "zl10036: " args); \
} while (0)
#define deb_info(args...) dprintk(0x01, args)
#define deb_i2c(args...) dprintk(0x02, args)
struct zl10036_state {
struct i2c_adapter *i2c;
const struct zl10036_config *config;
u32 frequency;
u8 br, bf;
};
/* This driver assumes the tuner is driven by a 10.111MHz Cristal */
#define _XTAL 10111
/* Some of the possible dividers:
* 64, (write 0x05 to reg), freq step size 158kHz
* 10, (write 0x0a to reg), freq step size 1.011kHz (used here)
* 5, (write 0x09 to reg), freq step size 2.022kHz
*/
#define _RDIV 10
#define _RDIV_REG 0x0a
#define _FR (_XTAL/_RDIV)
#define STATUS_POR 0x80 /* Power on Reset */
#define STATUS_FL 0x40 /* Frequency & Phase Lock */
/* read/write for zl10036 and zl10038 */
static int zl10036_read_status_reg(struct zl10036_state *state)
{
u8 status;
struct i2c_msg msg[1] = {
{ .addr = state->config->tuner_address, .flags = I2C_M_RD,
.buf = &status, .len = sizeof(status) },
};
if (i2c_transfer(state->i2c, msg, 1) != 1) {
printk(KERN_ERR "%s: i2c read failed at addr=%02x\n",
__func__, state->config->tuner_address);
return -EIO;
}
deb_i2c("R(status): %02x [FL=%d]\n", status,
(status & STATUS_FL) ? 1 : 0);
if (status & STATUS_POR)
deb_info("%s: Power-On-Reset bit enabled - need to initialize the tuner\n",
__func__);
return status;
}
static int zl10036_write(struct zl10036_state *state, u8 buf[], u8 count)
{
struct i2c_msg msg[1] = {
{ .addr = state->config->tuner_address, .flags = 0,
.buf = buf, .len = count },
};
u8 reg = 0;
int ret;
if (zl10036_debug & 0x02) {
/* every 8bit-value satisifes this!
* so only check for debug log */
if ((buf[0] & 0x80) == 0x00)
reg = 2;
else if ((buf[0] & 0xc0) == 0x80)
reg = 4;
else if ((buf[0] & 0xf0) == 0xc0)
reg = 6;
else if ((buf[0] & 0xf0) == 0xd0)
reg = 8;
else if ((buf[0] & 0xf0) == 0xe0)
reg = 10;
else if ((buf[0] & 0xf0) == 0xf0)
reg = 12;
deb_i2c("W(%d):", reg);
{
int i;
for (i = 0; i < count; i++)
printk(KERN_CONT " %02x", buf[i]);
printk(KERN_CONT "\n");
}
}
ret = i2c_transfer(state->i2c, msg, 1);
if (ret != 1) {
printk(KERN_ERR "%s: i2c error, ret=%d\n", __func__, ret);
return -EIO;
}
return 0;
}
static void zl10036_release(struct dvb_frontend *fe)
{
struct zl10036_state *state = fe->tuner_priv;
fe->tuner_priv = NULL;
kfree(state);
}
static int zl10036_sleep(struct dvb_frontend *fe)
{
struct zl10036_state *state = fe->tuner_priv;
u8 buf[] = { 0xf0, 0x80 }; /* regs 12/13 */
int ret;
deb_info("%s\n", __func__);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
ret = zl10036_write(state, buf, sizeof(buf));
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
return ret;
}
/**
* register map of the ZL10036/ZL10038
*
* reg[default] content
* 2[0x00]: 0 | N14 | N13 | N12 | N11 | N10 | N9 | N8
* 3[0x00]: N7 | N6 | N5 | N4 | N3 | N2 | N1 | N0
* 4[0x80]: 1 | 0 | RFG | BA1 | BA0 | BG1 | BG0 | LEN
* 5[0x00]: P0 | C1 | C0 | R4 | R3 | R2 | R1 | R0
* 6[0xc0]: 1 | 1 | 0 | 0 | RSD | 0 | 0 | 0
* 7[0x20]: P1 | BF6 | BF5 | BF4 | BF3 | BF2 | BF1 | 0
* 8[0xdb]: 1 | 1 | 0 | 1 | 0 | CC | 1 | 1
* 9[0x30]: VSD | V2 | V1 | V0 | S3 | S2 | S1 | S0
* 10[0xe1]: 1 | 1 | 1 | 0 | 0 | LS2 | LS1 | LS0
* 11[0xf5]: WS | WH2 | WH1 | WH0 | WL2 | WL1 | WL0 | WRE
* 12[0xf0]: 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0
* 13[0x28]: PD | BR4 | BR3 | BR2 | BR1 | BR0 | CLR | TL
*/
static int zl10036_set_frequency(struct zl10036_state *state, u32 frequency)
{
u8 buf[2];
u32 div, foffset;
div = (frequency + _FR/2) / _FR;
state->frequency = div * _FR;
foffset = frequency - state->frequency;
buf[0] = (div >> 8) & 0x7f;
buf[1] = (div >> 0) & 0xff;
deb_info("%s: ftodo=%u fpriv=%u ferr=%d div=%u\n", __func__,
frequency, state->frequency, foffset, div);
return zl10036_write(state, buf, sizeof(buf));
}
static int zl10036_set_bandwidth(struct zl10036_state *state, u32 fbw)
{
/* fbw is measured in kHz */
u8 br, bf;
int ret;
u8 buf_bf[] = {
0xc0, 0x00, /* 6/7: rsd=0 bf=0 */
};
u8 buf_br[] = {
0xf0, 0x00, /* 12/13: br=0xa clr=0 tl=0*/
};
u8 zl10036_rsd_off[] = { 0xc8 }; /* set RSD=1 */
/* ensure correct values */
if (fbw > 35000)
fbw = 35000;
if (fbw < 8000)
fbw = 8000;
#define _BR_MAXIMUM (_XTAL/575) /* _XTAL / 575kHz = 17 */
/* <= 28,82 MHz */
if (fbw <= 28820) {
br = _BR_MAXIMUM;
} else {
/**
* f(bw)=34,6MHz f(xtal)=10.111MHz
* br = (10111/34600) * 63 * 1/K = 14;
*/
br = ((_XTAL * 21 * 1000) / (fbw * 419));
}
/* ensure correct values */
if (br < 4)
br = 4;
if (br > _BR_MAXIMUM)
br = _BR_MAXIMUM;
/*
* k = 1.257
* bf = fbw/_XTAL * br * k - 1 */
bf = (fbw * br * 1257) / (_XTAL * 1000) - 1;
/* ensure correct values */
if (bf > 62)
bf = 62;
buf_bf[1] = (bf << 1) & 0x7e;
buf_br[1] = (br << 2) & 0x7c;
deb_info("%s: BW=%d br=%u bf=%u\n", __func__, fbw, br, bf);
if (br != state->br) {
ret = zl10036_write(state, buf_br, sizeof(buf_br));
if (ret < 0)
return ret;
}
if (bf != state->bf) {
ret = zl10036_write(state, buf_bf, sizeof(buf_bf));
if (ret < 0)
return ret;
/* time = br/(32* fxtal) */
/* minimal sleep time to be calculated
* maximum br is 63 -> max time = 2 /10 MHz = 2e-7 */
msleep(1);
ret = zl10036_write(state, zl10036_rsd_off,
sizeof(zl10036_rsd_off));
if (ret < 0)
return ret;
}
state->br = br;
state->bf = bf;
return 0;
}
static int zl10036_set_gain_params(struct zl10036_state *state,
int c)
{
u8 buf[2];
u8 rfg, ba, bg;
/* default values */
rfg = 0; /* enable when using an lna */
ba = 1;
bg = 1;
/* reg 4 */
buf[0] = 0x80 | ((rfg << 5) & 0x20)
| ((ba << 3) & 0x18) | ((bg << 1) & 0x06);
if (!state->config->rf_loop_enable)
buf[0] |= 0x01;
/* P0=0 */
buf[1] = _RDIV_REG | ((c << 5) & 0x60);
deb_info("%s: c=%u rfg=%u ba=%u bg=%u\n", __func__, c, rfg, ba, bg);
return zl10036_write(state, buf, sizeof(buf));
}
static int zl10036_set_params(struct dvb_frontend *fe)
{
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
struct zl10036_state *state = fe->tuner_priv;
int ret = 0;
u32 frequency = p->frequency;
u32 fbw;
int i;
u8 c;
/* ensure correct values
* maybe redundant as core already checks this */
if ((frequency < fe->ops.info.frequency_min)
|| (frequency > fe->ops.info.frequency_max))
return -EINVAL;
/**
* alpha = 1.35 for dvb-s
* fBW = (alpha*symbolrate)/(2*0.8)
* 1.35 / (2*0.8) = 27 / 32
*/
fbw = (27 * p->symbol_rate) / 32;
/* scale to kHz */
fbw /= 1000;
/* Add safe margin of 3MHz */
fbw += 3000;
/* setting the charge pump - guessed values */
if (frequency < 950000)
return -EINVAL;
else if (frequency < 1250000)
c = 0;
else if (frequency < 1750000)
c = 1;
else if (frequency < 2175000)
c = 2;
else
return -EINVAL;
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
ret = zl10036_set_gain_params(state, c);
if (ret < 0)
goto error;
ret = zl10036_set_frequency(state, p->frequency);
if (ret < 0)
goto error;
ret = zl10036_set_bandwidth(state, fbw);
if (ret < 0)
goto error;
/* wait for tuner lock - no idea if this is really needed */
for (i = 0; i < 20; i++) {
ret = zl10036_read_status_reg(state);
if (ret < 0)
goto error;
/* check Frequency & Phase Lock Bit */
if (ret & STATUS_FL)
break;
msleep(10);
}
error:
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
return ret;
}
static int zl10036_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
struct zl10036_state *state = fe->tuner_priv;
*frequency = state->frequency;
return 0;
}
static int zl10036_init_regs(struct zl10036_state *state)
{
int ret;
int i;
/* could also be one block from reg 2 to 13 and additional 10/11 */
u8 zl10036_init_tab[][2] = {
{ 0x04, 0x00 }, /* 2/3: div=0x400 - arbitrary value */
{ 0x8b, _RDIV_REG }, /* 4/5: rfg=0 ba=1 bg=1 len=? */
/* p0=0 c=0 r=_RDIV_REG */
{ 0xc0, 0x20 }, /* 6/7: rsd=0 bf=0x10 */
{ 0xd3, 0x40 }, /* 8/9: from datasheet */
{ 0xe3, 0x5b }, /* 10/11: lock window level */
{ 0xf0, 0x28 }, /* 12/13: br=0xa clr=0 tl=0*/
{ 0xe3, 0xf9 }, /* 10/11: unlock window level */
};
/* invalid values to trigger writing */
state->br = 0xff;
state->bf = 0xff;
if (!state->config->rf_loop_enable)
zl10036_init_tab[1][0] |= 0x01;
deb_info("%s\n", __func__);
for (i = 0; i < ARRAY_SIZE(zl10036_init_tab); i++) {
ret = zl10036_write(state, zl10036_init_tab[i], 2);
if (ret < 0)
return ret;
}
return 0;
}
static int zl10036_init(struct dvb_frontend *fe)
{
struct zl10036_state *state = fe->tuner_priv;
int ret = 0;
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
ret = zl10036_read_status_reg(state);
if (ret < 0)
return ret;
/* Only init if Power-on-Reset bit is set? */
ret = zl10036_init_regs(state);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
return ret;
}
static const struct dvb_tuner_ops zl10036_tuner_ops = {
.info = {
.name = "Zarlink ZL10036",
.frequency_min = 950000,
.frequency_max = 2175000
},
.init = zl10036_init,
.release = zl10036_release,
.sleep = zl10036_sleep,
.set_params = zl10036_set_params,
.get_frequency = zl10036_get_frequency,
};
struct dvb_frontend *zl10036_attach(struct dvb_frontend *fe,
const struct zl10036_config *config,
struct i2c_adapter *i2c)
{
struct zl10036_state *state;
int ret;
if (!config) {
printk(KERN_ERR "%s: no config specified", __func__);
return NULL;
}
state = kzalloc(sizeof(struct zl10036_state), GFP_KERNEL);
if (!state)
return NULL;
state->config = config;
state->i2c = i2c;
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
ret = zl10036_read_status_reg(state);
if (ret < 0) {
printk(KERN_ERR "%s: No zl10036 found\n", __func__);
goto error;
}
ret = zl10036_init_regs(state);
if (ret < 0) {
printk(KERN_ERR "%s: tuner initialization failed\n",
__func__);
goto error;
}
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
fe->tuner_priv = state;
memcpy(&fe->ops.tuner_ops, &zl10036_tuner_ops,
sizeof(struct dvb_tuner_ops));
printk(KERN_INFO "%s: tuner initialization (%s addr=0x%02x) ok\n",
__func__, fe->ops.tuner_ops.info.name, config->tuner_address);
return fe;
error:
kfree(state);
return NULL;
}
EXPORT_SYMBOL(zl10036_attach);
module_param_named(debug, zl10036_debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
MODULE_DESCRIPTION("DVB ZL10036 driver");
MODULE_AUTHOR("Tino Reichardt");
MODULE_AUTHOR("Matthias Schwarzott");
MODULE_LICENSE("GPL");
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