/* * Driver for Freescale MC44S803 Low Power CMOS Broadband Tuner * * Copyright (c) 2009 Jochen Friedrich <jochen@scram.de> * * 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 <linux/module.h> #include <linux/delay.h> #include <linux/dvb/frontend.h> #include <linux/i2c.h> #include <linux/slab.h> #include "dvb_frontend.h" #include "mc44s803.h" #include "mc44s803_priv.h" #define mc_printk(level, format, arg...) \ printk(level "mc44s803: " format , ## arg) /* Writes a single register */ static int mc44s803_writereg(struct mc44s803_priv *priv, u32 val) { u8 buf[3]; struct i2c_msg msg = { .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 3 }; buf[0] = (val & 0xff0000) >> 16; buf[1] = (val & 0xff00) >> 8; buf[2] = (val & 0xff); if (i2c_transfer(priv->i2c, &msg, 1) != 1) { mc_printk(KERN_WARNING, "I2C write failed\n"); return -EREMOTEIO; } return 0; } /* Reads a single register */ static int mc44s803_readreg(struct mc44s803_priv *priv, u8 reg, u32 *val) { u32 wval; u8 buf[3]; int ret; struct i2c_msg msg[] = { { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, .buf = buf, .len = 3 }, }; wval = MC44S803_REG_SM(MC44S803_REG_DATAREG, MC44S803_ADDR) | MC44S803_REG_SM(reg, MC44S803_D); ret = mc44s803_writereg(priv, wval); if (ret) return ret; if (i2c_transfer(priv->i2c, msg, 1) != 1) { mc_printk(KERN_WARNING, "I2C read failed\n"); return -EREMOTEIO; } *val = (buf[0] << 16) | (buf[1] << 8) | buf[2]; return 0; } static int mc44s803_release(struct dvb_frontend *fe) { struct mc44s803_priv *priv = fe->tuner_priv; fe->tuner_priv = NULL; kfree(priv); return 0; } static int mc44s803_init(struct dvb_frontend *fe) { struct mc44s803_priv *priv = fe->tuner_priv; u32 val; int err; if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 1); /* Reset chip */ val = MC44S803_REG_SM(MC44S803_REG_RESET, MC44S803_ADDR) | MC44S803_REG_SM(1, MC44S803_RS); err = mc44s803_writereg(priv, val); if (err) goto exit; val = MC44S803_REG_SM(MC44S803_REG_RESET, MC44S803_ADDR); err = mc44s803_writereg(priv, val); if (err) goto exit; /* Power Up and Start Osc */ val = MC44S803_REG_SM(MC44S803_REG_REFOSC, MC44S803_ADDR) | MC44S803_REG_SM(0xC0, MC44S803_REFOSC) | MC44S803_REG_SM(1, MC44S803_OSCSEL); err = mc44s803_writereg(priv, val); if (err) goto exit; val = MC44S803_REG_SM(MC44S803_REG_POWER, MC44S803_ADDR) | MC44S803_REG_SM(0x200, MC44S803_POWER); err = mc44s803_writereg(priv, val); if (err) goto exit; msleep(10); val = MC44S803_REG_SM(MC44S803_REG_REFOSC, MC44S803_ADDR) | MC44S803_REG_SM(0x40, MC44S803_REFOSC) | MC44S803_REG_SM(1, MC44S803_OSCSEL); err = mc44s803_writereg(priv, val); if (err) goto exit; msleep(20); /* Setup Mixer */ val = MC44S803_REG_SM(MC44S803_REG_MIXER, MC44S803_ADDR) | MC44S803_REG_SM(1, MC44S803_TRI_STATE) | MC44S803_REG_SM(0x7F, MC44S803_MIXER_RES); err = mc44s803_writereg(priv, val); if (err) goto exit; /* Setup Cirquit Adjust */ val = MC44S803_REG_SM(MC44S803_REG_CIRCADJ, MC44S803_ADDR) | MC44S803_REG_SM(1, MC44S803_G1) | MC44S803_REG_SM(1, MC44S803_G3) | MC44S803_REG_SM(0x3, MC44S803_CIRCADJ_RES) | MC44S803_REG_SM(1, MC44S803_G6) | MC44S803_REG_SM(priv->cfg->dig_out, MC44S803_S1) | MC44S803_REG_SM(0x3, MC44S803_LP) | MC44S803_REG_SM(1, MC44S803_CLRF) | MC44S803_REG_SM(1, MC44S803_CLIF); err = mc44s803_writereg(priv, val); if (err) goto exit; val = MC44S803_REG_SM(MC44S803_REG_CIRCADJ, MC44S803_ADDR) | MC44S803_REG_SM(1, MC44S803_G1) | MC44S803_REG_SM(1, MC44S803_G3) | MC44S803_REG_SM(0x3, MC44S803_CIRCADJ_RES) | MC44S803_REG_SM(1, MC44S803_G6) | MC44S803_REG_SM(priv->cfg->dig_out, MC44S803_S1) | MC44S803_REG_SM(0x3, MC44S803_LP); err = mc44s803_writereg(priv, val); if (err) goto exit; /* Setup Digtune */ val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) | MC44S803_REG_SM(3, MC44S803_XOD); err = mc44s803_writereg(priv, val); if (err) goto exit; /* Setup AGC */ val = MC44S803_REG_SM(MC44S803_REG_LNAAGC, MC44S803_ADDR) | MC44S803_REG_SM(1, MC44S803_AT1) | MC44S803_REG_SM(1, MC44S803_AT2) | MC44S803_REG_SM(1, MC44S803_AGC_AN_DIG) | MC44S803_REG_SM(1, MC44S803_AGC_READ_EN) | MC44S803_REG_SM(1, MC44S803_LNA0); err = mc44s803_writereg(priv, val); if (err) goto exit; if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); return 0; exit: if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); mc_printk(KERN_WARNING, "I/O Error\n"); return err; } static int mc44s803_set_params(struct dvb_frontend *fe) { struct mc44s803_priv *priv = fe->tuner_priv; struct dtv_frontend_properties *c = &fe->dtv_property_cache; u32 r1, r2, n1, n2, lo1, lo2, freq, val; int err; priv->frequency = c->frequency; r1 = MC44S803_OSC / 1000000; r2 = MC44S803_OSC / 100000; n1 = (c->frequency + MC44S803_IF1 + 500000) / 1000000; freq = MC44S803_OSC / r1 * n1; lo1 = ((60 * n1) + (r1 / 2)) / r1; freq = freq - c->frequency; n2 = (freq - MC44S803_IF2 + 50000) / 100000; lo2 = ((60 * n2) + (r2 / 2)) / r2; if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 1); val = MC44S803_REG_SM(MC44S803_REG_REFDIV, MC44S803_ADDR) | MC44S803_REG_SM(r1-1, MC44S803_R1) | MC44S803_REG_SM(r2-1, MC44S803_R2) | MC44S803_REG_SM(1, MC44S803_REFBUF_EN); err = mc44s803_writereg(priv, val); if (err) goto exit; val = MC44S803_REG_SM(MC44S803_REG_LO1, MC44S803_ADDR) | MC44S803_REG_SM(n1-2, MC44S803_LO1); err = mc44s803_writereg(priv, val); if (err) goto exit; val = MC44S803_REG_SM(MC44S803_REG_LO2, MC44S803_ADDR) | MC44S803_REG_SM(n2-2, MC44S803_LO2); err = mc44s803_writereg(priv, val); if (err) goto exit; val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) | MC44S803_REG_SM(1, MC44S803_DA) | MC44S803_REG_SM(lo1, MC44S803_LO_REF) | MC44S803_REG_SM(1, MC44S803_AT); err = mc44s803_writereg(priv, val); if (err) goto exit; val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) | MC44S803_REG_SM(2, MC44S803_DA) | MC44S803_REG_SM(lo2, MC44S803_LO_REF) | MC44S803_REG_SM(1, MC44S803_AT); err = mc44s803_writereg(priv, val); if (err) goto exit; if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); return 0; exit: if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); mc_printk(KERN_WARNING, "I/O Error\n"); return err; } static int mc44s803_get_frequency(struct dvb_frontend *fe, u32 *frequency) { struct mc44s803_priv *priv = fe->tuner_priv; *frequency = priv->frequency; return 0; } static int mc44s803_get_if_frequency(struct dvb_frontend *fe, u32 *frequency) { *frequency = MC44S803_IF2; /* 36.125 MHz */ return 0; } static const struct dvb_tuner_ops mc44s803_tuner_ops = { .info = { .name = "Freescale MC44S803", .frequency_min = 48000000, .frequency_max = 1000000000, .frequency_step = 100000, }, .release = mc44s803_release, .init = mc44s803_init, .set_params = mc44s803_set_params, .get_frequency = mc44s803_get_frequency, .get_if_frequency = mc44s803_get_if_frequency, }; /* This functions tries to identify a MC44S803 tuner by reading the ID register. This is hasty. */ struct dvb_frontend *mc44s803_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, struct mc44s803_config *cfg) { struct mc44s803_priv *priv; u32 reg; u8 id; int ret; reg = 0; priv = kzalloc(sizeof(struct mc44s803_priv), GFP_KERNEL); if (priv == NULL) return NULL; priv->cfg = cfg; priv->i2c = i2c; priv->fe = fe; if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */ ret = mc44s803_readreg(priv, MC44S803_REG_ID, ®); if (ret) goto error; id = MC44S803_REG_MS(reg, MC44S803_ID); if (id != 0x14) { mc_printk(KERN_ERR, "unsupported ID " "(%x should be 0x14)\n", id); goto error; } mc_printk(KERN_INFO, "successfully identified (ID = %x)\n", id); memcpy(&fe->ops.tuner_ops, &mc44s803_tuner_ops, sizeof(struct dvb_tuner_ops)); fe->tuner_priv = priv; if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */ return fe; error: if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */ kfree(priv); return NULL; } EXPORT_SYMBOL(mc44s803_attach); MODULE_AUTHOR("Jochen Friedrich"); MODULE_DESCRIPTION("Freescale MC44S803 silicon tuner driver"); MODULE_LICENSE("GPL");