/* * NXP TDA18212HN silicon tuner driver * * Copyright (C) 2011 Antti Palosaari * * 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include "tda18212.h" struct tda18212_priv { struct tda18212_config *cfg; struct i2c_adapter *i2c; }; #define dbg(fmt, arg...) \ do { \ if (debug) \ pr_info("%s: " fmt, __func__, ##arg); \ } while (0) static int debug; module_param(debug, int, 0644); MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off)."); /* write multiple registers */ static int tda18212_wr_regs(struct tda18212_priv *priv, u8 reg, u8 *val, int len) { int ret; u8 buf[len+1]; struct i2c_msg msg[1] = { { .addr = priv->cfg->i2c_address, .flags = 0, .len = sizeof(buf), .buf = buf, } }; buf[0] = reg; memcpy(&buf[1], val, len); ret = i2c_transfer(priv->i2c, msg, 1); if (ret == 1) { ret = 0; } else { pr_warn("i2c wr failed ret:%d reg:%02x len:%d\n", ret, reg, len); ret = -EREMOTEIO; } return ret; } /* read multiple registers */ static int tda18212_rd_regs(struct tda18212_priv *priv, u8 reg, u8 *val, int len) { int ret; u8 buf[len]; struct i2c_msg msg[2] = { { .addr = priv->cfg->i2c_address, .flags = 0, .len = 1, .buf = ®, }, { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, .len = sizeof(buf), .buf = buf, } }; ret = i2c_transfer(priv->i2c, msg, 2); if (ret == 2) { memcpy(val, buf, len); ret = 0; } else { pr_warn("i2c rd failed ret:%d reg:%02x len:%d\n", ret, reg, len); ret = -EREMOTEIO; } return ret; } /* write single register */ static int tda18212_wr_reg(struct tda18212_priv *priv, u8 reg, u8 val) { return tda18212_wr_regs(priv, reg, &val, 1); } /* read single register */ static int tda18212_rd_reg(struct tda18212_priv *priv, u8 reg, u8 *val) { return tda18212_rd_regs(priv, reg, val, 1); } #if 0 /* keep, useful when developing driver */ static void tda18212_dump_regs(struct tda18212_priv *priv) { int i; u8 buf[256]; #define TDA18212_RD_LEN 32 for (i = 0; i < sizeof(buf); i += TDA18212_RD_LEN) tda18212_rd_regs(priv, i, &buf[i], TDA18212_RD_LEN); print_hex_dump(KERN_INFO, "", DUMP_PREFIX_OFFSET, 32, 1, buf, sizeof(buf), true); return; } #endif static int tda18212_set_params(struct dvb_frontend *fe, struct dvb_frontend_parameters *p) { struct tda18212_priv *priv = fe->tuner_priv; struct dtv_frontend_properties *c = &fe->dtv_property_cache; int ret, i; u32 if_khz; u8 buf[9]; static const u8 bw_params[][3] = { /* 0f 13 23 */ { 0xb3, 0x20, 0x03 }, /* DVB-T 6 MHz */ { 0xb3, 0x31, 0x01 }, /* DVB-T 7 MHz */ { 0xb3, 0x22, 0x01 }, /* DVB-T 8 MHz */ { 0x92, 0x53, 0x03 }, /* DVB-C */ }; dbg("delsys=%d RF=%d BW=%d\n", c->delivery_system, c->frequency, c->bandwidth_hz); if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */ switch (c->delivery_system) { case SYS_DVBT: switch (c->bandwidth_hz) { case 6000000: if_khz = priv->cfg->if_dvbt_6; i = 0; break; case 7000000: if_khz = priv->cfg->if_dvbt_7; i = 1; break; case 8000000: if_khz = priv->cfg->if_dvbt_8; i = 2; break; default: ret = -EINVAL; goto error; } break; case SYS_DVBC_ANNEX_AC: if_khz = priv->cfg->if_dvbc; i = 3; break; default: ret = -EINVAL; goto error; } ret = tda18212_wr_reg(priv, 0x23, bw_params[i][2]); if (ret) goto error; ret = tda18212_wr_reg(priv, 0x06, 0x00); if (ret) goto error; ret = tda18212_wr_reg(priv, 0x0f, bw_params[i][0]); if (ret) goto error; buf[0] = 0x02; buf[1] = bw_params[i][1]; buf[2] = 0x03; /* default value */ buf[3] = if_khz / 50; buf[4] = ((c->frequency / 1000) >> 16) & 0xff; buf[5] = ((c->frequency / 1000) >> 8) & 0xff; buf[6] = ((c->frequency / 1000) >> 0) & 0xff; buf[7] = 0xc1; buf[8] = 0x01; ret = tda18212_wr_regs(priv, 0x12, buf, sizeof(buf)); if (ret) goto error; exit: if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */ return ret; error: dbg("failed:%d\n", ret); goto exit; } static int tda18212_release(struct dvb_frontend *fe) { kfree(fe->tuner_priv); fe->tuner_priv = NULL; return 0; } static const struct dvb_tuner_ops tda18212_tuner_ops = { .info = { .name = "NXP TDA18212", .frequency_min = 48000000, .frequency_max = 864000000, .frequency_step = 1000, }, .release = tda18212_release, .set_params = tda18212_set_params, }; struct dvb_frontend *tda18212_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, struct tda18212_config *cfg) { struct tda18212_priv *priv = NULL; int ret; u8 val; priv = kzalloc(sizeof(struct tda18212_priv), GFP_KERNEL); if (priv == NULL) return NULL; priv->cfg = cfg; priv->i2c = i2c; fe->tuner_priv = priv; if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */ /* check if the tuner is there */ ret = tda18212_rd_reg(priv, 0x00, &val); if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */ dbg("ret:%d chip ID:%02x\n", ret, val); if (ret || val != 0xc7) { kfree(priv); return NULL; } pr_info("NXP TDA18212HN successfully identified\n"); memcpy(&fe->ops.tuner_ops, &tda18212_tuner_ops, sizeof(struct dvb_tuner_ops)); return fe; } EXPORT_SYMBOL(tda18212_attach); MODULE_DESCRIPTION("NXP TDA18212HN silicon tuner driver"); MODULE_AUTHOR("Antti Palosaari "); MODULE_LICENSE("GPL");