312 lines
6.7 KiB
C
312 lines
6.7 KiB
C
/*
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* NXP TDA18212HN silicon tuner driver
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*
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* Copyright (C) 2011 Antti Palosaari <crope@iki.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include "tda18212.h"
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struct tda18212_priv {
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struct tda18212_config *cfg;
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struct i2c_adapter *i2c;
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};
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#define dbg(fmt, arg...) \
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do { \
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if (debug) \
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pr_info("%s: " fmt, __func__, ##arg); \
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} while (0)
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static int debug;
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
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/* write multiple registers */
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static int tda18212_wr_regs(struct tda18212_priv *priv, u8 reg, u8 *val,
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int len)
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{
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int ret;
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u8 buf[len+1];
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struct i2c_msg msg[1] = {
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{
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.addr = priv->cfg->i2c_address,
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.flags = 0,
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.len = sizeof(buf),
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.buf = buf,
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}
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};
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buf[0] = reg;
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memcpy(&buf[1], val, len);
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ret = i2c_transfer(priv->i2c, msg, 1);
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if (ret == 1) {
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ret = 0;
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} else {
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pr_warn("i2c wr failed ret:%d reg:%02x len:%d\n",
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ret, reg, len);
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ret = -EREMOTEIO;
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}
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return ret;
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}
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/* read multiple registers */
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static int tda18212_rd_regs(struct tda18212_priv *priv, u8 reg, u8 *val,
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int len)
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{
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int ret;
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u8 buf[len];
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struct i2c_msg msg[2] = {
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{
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.addr = priv->cfg->i2c_address,
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.flags = 0,
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.len = 1,
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.buf = ®,
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}, {
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.addr = priv->cfg->i2c_address,
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.flags = I2C_M_RD,
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.len = sizeof(buf),
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.buf = buf,
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}
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};
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ret = i2c_transfer(priv->i2c, msg, 2);
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if (ret == 2) {
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memcpy(val, buf, len);
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ret = 0;
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} else {
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pr_warn("i2c rd failed ret:%d reg:%02x len:%d\n",
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ret, reg, len);
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ret = -EREMOTEIO;
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}
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return ret;
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}
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/* write single register */
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static int tda18212_wr_reg(struct tda18212_priv *priv, u8 reg, u8 val)
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{
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return tda18212_wr_regs(priv, reg, &val, 1);
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}
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/* read single register */
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static int tda18212_rd_reg(struct tda18212_priv *priv, u8 reg, u8 *val)
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{
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return tda18212_rd_regs(priv, reg, val, 1);
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}
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#if 0 /* keep, useful when developing driver */
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static void tda18212_dump_regs(struct tda18212_priv *priv)
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{
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int i;
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u8 buf[256];
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#define TDA18212_RD_LEN 32
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for (i = 0; i < sizeof(buf); i += TDA18212_RD_LEN)
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tda18212_rd_regs(priv, i, &buf[i], TDA18212_RD_LEN);
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print_hex_dump(KERN_INFO, "", DUMP_PREFIX_OFFSET, 32, 1, buf,
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sizeof(buf), true);
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return;
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}
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#endif
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static int tda18212_set_params(struct dvb_frontend *fe,
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struct dvb_frontend_parameters *p)
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{
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struct tda18212_priv *priv = fe->tuner_priv;
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struct dtv_frontend_properties *c = &fe->dtv_property_cache;
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int ret, i;
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u32 if_khz;
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u8 buf[9];
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#define DVBT_6 0
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#define DVBT_7 1
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#define DVBT_8 2
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#define DVBT2_6 3
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#define DVBT2_7 4
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#define DVBT2_8 5
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#define DVBC_6 6
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#define DVBC_8 7
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static const u8 bw_params[][3] = {
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/* reg: 0f 13 23 */
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[DVBT_6] = { 0xb3, 0x20, 0x03 },
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[DVBT_7] = { 0xb3, 0x31, 0x01 },
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[DVBT_8] = { 0xb3, 0x22, 0x01 },
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[DVBT2_6] = { 0xbc, 0x20, 0x03 },
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[DVBT2_7] = { 0xbc, 0x72, 0x03 },
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[DVBT2_8] = { 0xbc, 0x22, 0x01 },
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[DVBC_6] = { 0x92, 0x50, 0x03 },
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[DVBC_8] = { 0x92, 0x53, 0x03 },
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};
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dbg("delsys=%d RF=%d BW=%d\n",
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c->delivery_system, c->frequency, c->bandwidth_hz);
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if (fe->ops.i2c_gate_ctrl)
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fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
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switch (c->delivery_system) {
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case SYS_DVBT:
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switch (c->bandwidth_hz) {
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case 6000000:
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if_khz = priv->cfg->if_dvbt_6;
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i = DVBT_6;
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break;
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case 7000000:
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if_khz = priv->cfg->if_dvbt_7;
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i = DVBT_7;
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break;
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case 8000000:
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if_khz = priv->cfg->if_dvbt_8;
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i = DVBT_8;
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break;
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default:
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ret = -EINVAL;
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goto error;
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}
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break;
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case SYS_DVBT2:
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switch (c->bandwidth_hz) {
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case 6000000:
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if_khz = priv->cfg->if_dvbt2_6;
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i = DVBT2_6;
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break;
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case 7000000:
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if_khz = priv->cfg->if_dvbt2_7;
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i = DVBT2_7;
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break;
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case 8000000:
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if_khz = priv->cfg->if_dvbt2_8;
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i = DVBT2_8;
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break;
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default:
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ret = -EINVAL;
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goto error;
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}
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break;
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case SYS_DVBC_ANNEX_AC:
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if_khz = priv->cfg->if_dvbc;
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i = DVBC_8;
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break;
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default:
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ret = -EINVAL;
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goto error;
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}
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ret = tda18212_wr_reg(priv, 0x23, bw_params[i][2]);
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if (ret)
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goto error;
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ret = tda18212_wr_reg(priv, 0x06, 0x00);
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if (ret)
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goto error;
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ret = tda18212_wr_reg(priv, 0x0f, bw_params[i][0]);
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if (ret)
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goto error;
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buf[0] = 0x02;
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buf[1] = bw_params[i][1];
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buf[2] = 0x03; /* default value */
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buf[3] = if_khz / 50;
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buf[4] = ((c->frequency / 1000) >> 16) & 0xff;
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buf[5] = ((c->frequency / 1000) >> 8) & 0xff;
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buf[6] = ((c->frequency / 1000) >> 0) & 0xff;
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buf[7] = 0xc1;
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buf[8] = 0x01;
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ret = tda18212_wr_regs(priv, 0x12, buf, sizeof(buf));
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if (ret)
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goto error;
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exit:
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if (fe->ops.i2c_gate_ctrl)
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fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
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return ret;
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error:
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dbg("failed:%d\n", ret);
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goto exit;
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}
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static int tda18212_release(struct dvb_frontend *fe)
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{
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kfree(fe->tuner_priv);
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fe->tuner_priv = NULL;
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return 0;
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}
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static const struct dvb_tuner_ops tda18212_tuner_ops = {
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.info = {
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.name = "NXP TDA18212",
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.frequency_min = 48000000,
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.frequency_max = 864000000,
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.frequency_step = 1000,
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},
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.release = tda18212_release,
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.set_params = tda18212_set_params,
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};
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struct dvb_frontend *tda18212_attach(struct dvb_frontend *fe,
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struct i2c_adapter *i2c, struct tda18212_config *cfg)
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{
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struct tda18212_priv *priv = NULL;
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int ret;
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u8 val;
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priv = kzalloc(sizeof(struct tda18212_priv), GFP_KERNEL);
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if (priv == NULL)
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return NULL;
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priv->cfg = cfg;
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priv->i2c = i2c;
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fe->tuner_priv = priv;
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if (fe->ops.i2c_gate_ctrl)
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fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
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/* check if the tuner is there */
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ret = tda18212_rd_reg(priv, 0x00, &val);
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if (fe->ops.i2c_gate_ctrl)
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fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
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dbg("ret:%d chip ID:%02x\n", ret, val);
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if (ret || val != 0xc7) {
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kfree(priv);
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return NULL;
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}
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pr_info("NXP TDA18212HN successfully identified\n");
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memcpy(&fe->ops.tuner_ops, &tda18212_tuner_ops,
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sizeof(struct dvb_tuner_ops));
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return fe;
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}
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EXPORT_SYMBOL(tda18212_attach);
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MODULE_DESCRIPTION("NXP TDA18212HN silicon tuner driver");
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MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
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MODULE_LICENSE("GPL");
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