364 lines
8.4 KiB
C
364 lines
8.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Driver for Freescale MC44S803 Low Power CMOS Broadband Tuner
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*
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* Copyright (c) 2009 Jochen Friedrich <jochen@scram.de>
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*/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/dvb/frontend.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <media/dvb_frontend.h>
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#include "mc44s803.h"
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#include "mc44s803_priv.h"
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#define mc_printk(level, format, arg...) \
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printk(level "mc44s803: " format , ## arg)
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/* Writes a single register */
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static int mc44s803_writereg(struct mc44s803_priv *priv, u32 val)
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{
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u8 buf[3];
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struct i2c_msg msg = {
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.addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 3
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};
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buf[0] = (val & 0xff0000) >> 16;
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buf[1] = (val & 0xff00) >> 8;
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buf[2] = (val & 0xff);
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if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
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mc_printk(KERN_WARNING, "I2C write failed\n");
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return -EREMOTEIO;
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}
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return 0;
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}
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/* Reads a single register */
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static int mc44s803_readreg(struct mc44s803_priv *priv, u8 reg, u32 *val)
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{
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u32 wval;
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u8 buf[3];
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int ret;
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struct i2c_msg msg[] = {
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{ .addr = priv->cfg->i2c_address, .flags = I2C_M_RD,
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.buf = buf, .len = 3 },
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};
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wval = MC44S803_REG_SM(MC44S803_REG_DATAREG, MC44S803_ADDR) |
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MC44S803_REG_SM(reg, MC44S803_D);
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ret = mc44s803_writereg(priv, wval);
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if (ret)
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return ret;
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if (i2c_transfer(priv->i2c, msg, 1) != 1) {
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mc_printk(KERN_WARNING, "I2C read failed\n");
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return -EREMOTEIO;
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}
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*val = (buf[0] << 16) | (buf[1] << 8) | buf[2];
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return 0;
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}
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static void mc44s803_release(struct dvb_frontend *fe)
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{
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struct mc44s803_priv *priv = fe->tuner_priv;
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fe->tuner_priv = NULL;
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kfree(priv);
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}
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static int mc44s803_init(struct dvb_frontend *fe)
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{
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struct mc44s803_priv *priv = fe->tuner_priv;
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u32 val;
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int err;
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if (fe->ops.i2c_gate_ctrl)
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fe->ops.i2c_gate_ctrl(fe, 1);
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/* Reset chip */
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val = MC44S803_REG_SM(MC44S803_REG_RESET, MC44S803_ADDR) |
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MC44S803_REG_SM(1, MC44S803_RS);
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err = mc44s803_writereg(priv, val);
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if (err)
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goto exit;
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val = MC44S803_REG_SM(MC44S803_REG_RESET, MC44S803_ADDR);
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err = mc44s803_writereg(priv, val);
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if (err)
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goto exit;
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/* Power Up and Start Osc */
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val = MC44S803_REG_SM(MC44S803_REG_REFOSC, MC44S803_ADDR) |
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MC44S803_REG_SM(0xC0, MC44S803_REFOSC) |
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MC44S803_REG_SM(1, MC44S803_OSCSEL);
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err = mc44s803_writereg(priv, val);
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if (err)
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goto exit;
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val = MC44S803_REG_SM(MC44S803_REG_POWER, MC44S803_ADDR) |
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MC44S803_REG_SM(0x200, MC44S803_POWER);
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err = mc44s803_writereg(priv, val);
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if (err)
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goto exit;
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msleep(10);
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val = MC44S803_REG_SM(MC44S803_REG_REFOSC, MC44S803_ADDR) |
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MC44S803_REG_SM(0x40, MC44S803_REFOSC) |
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MC44S803_REG_SM(1, MC44S803_OSCSEL);
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err = mc44s803_writereg(priv, val);
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if (err)
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goto exit;
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msleep(20);
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/* Setup Mixer */
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val = MC44S803_REG_SM(MC44S803_REG_MIXER, MC44S803_ADDR) |
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MC44S803_REG_SM(1, MC44S803_TRI_STATE) |
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MC44S803_REG_SM(0x7F, MC44S803_MIXER_RES);
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err = mc44s803_writereg(priv, val);
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if (err)
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goto exit;
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/* Setup Cirquit Adjust */
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val = MC44S803_REG_SM(MC44S803_REG_CIRCADJ, MC44S803_ADDR) |
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MC44S803_REG_SM(1, MC44S803_G1) |
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MC44S803_REG_SM(1, MC44S803_G3) |
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MC44S803_REG_SM(0x3, MC44S803_CIRCADJ_RES) |
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MC44S803_REG_SM(1, MC44S803_G6) |
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MC44S803_REG_SM(priv->cfg->dig_out, MC44S803_S1) |
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MC44S803_REG_SM(0x3, MC44S803_LP) |
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MC44S803_REG_SM(1, MC44S803_CLRF) |
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MC44S803_REG_SM(1, MC44S803_CLIF);
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err = mc44s803_writereg(priv, val);
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if (err)
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goto exit;
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val = MC44S803_REG_SM(MC44S803_REG_CIRCADJ, MC44S803_ADDR) |
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MC44S803_REG_SM(1, MC44S803_G1) |
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MC44S803_REG_SM(1, MC44S803_G3) |
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MC44S803_REG_SM(0x3, MC44S803_CIRCADJ_RES) |
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MC44S803_REG_SM(1, MC44S803_G6) |
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MC44S803_REG_SM(priv->cfg->dig_out, MC44S803_S1) |
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MC44S803_REG_SM(0x3, MC44S803_LP);
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err = mc44s803_writereg(priv, val);
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if (err)
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goto exit;
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/* Setup Digtune */
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val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
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MC44S803_REG_SM(3, MC44S803_XOD);
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err = mc44s803_writereg(priv, val);
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if (err)
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goto exit;
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/* Setup AGC */
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val = MC44S803_REG_SM(MC44S803_REG_LNAAGC, MC44S803_ADDR) |
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MC44S803_REG_SM(1, MC44S803_AT1) |
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MC44S803_REG_SM(1, MC44S803_AT2) |
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MC44S803_REG_SM(1, MC44S803_AGC_AN_DIG) |
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MC44S803_REG_SM(1, MC44S803_AGC_READ_EN) |
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MC44S803_REG_SM(1, MC44S803_LNA0);
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err = mc44s803_writereg(priv, val);
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if (err)
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goto exit;
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if (fe->ops.i2c_gate_ctrl)
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fe->ops.i2c_gate_ctrl(fe, 0);
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return 0;
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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);
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mc_printk(KERN_WARNING, "I/O Error\n");
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return err;
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}
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static int mc44s803_set_params(struct dvb_frontend *fe)
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{
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struct mc44s803_priv *priv = fe->tuner_priv;
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struct dtv_frontend_properties *c = &fe->dtv_property_cache;
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u32 r1, r2, n1, n2, lo1, lo2, freq, val;
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int err;
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priv->frequency = c->frequency;
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r1 = MC44S803_OSC / 1000000;
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r2 = MC44S803_OSC / 100000;
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n1 = (c->frequency + MC44S803_IF1 + 500000) / 1000000;
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freq = MC44S803_OSC / r1 * n1;
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lo1 = ((60 * n1) + (r1 / 2)) / r1;
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freq = freq - c->frequency;
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n2 = (freq - MC44S803_IF2 + 50000) / 100000;
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lo2 = ((60 * n2) + (r2 / 2)) / r2;
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if (fe->ops.i2c_gate_ctrl)
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fe->ops.i2c_gate_ctrl(fe, 1);
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val = MC44S803_REG_SM(MC44S803_REG_REFDIV, MC44S803_ADDR) |
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MC44S803_REG_SM(r1-1, MC44S803_R1) |
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MC44S803_REG_SM(r2-1, MC44S803_R2) |
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MC44S803_REG_SM(1, MC44S803_REFBUF_EN);
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err = mc44s803_writereg(priv, val);
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if (err)
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goto exit;
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val = MC44S803_REG_SM(MC44S803_REG_LO1, MC44S803_ADDR) |
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MC44S803_REG_SM(n1-2, MC44S803_LO1);
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err = mc44s803_writereg(priv, val);
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if (err)
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goto exit;
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val = MC44S803_REG_SM(MC44S803_REG_LO2, MC44S803_ADDR) |
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MC44S803_REG_SM(n2-2, MC44S803_LO2);
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err = mc44s803_writereg(priv, val);
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if (err)
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goto exit;
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val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
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MC44S803_REG_SM(1, MC44S803_DA) |
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MC44S803_REG_SM(lo1, MC44S803_LO_REF) |
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MC44S803_REG_SM(1, MC44S803_AT);
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err = mc44s803_writereg(priv, val);
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if (err)
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goto exit;
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val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
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MC44S803_REG_SM(2, MC44S803_DA) |
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MC44S803_REG_SM(lo2, MC44S803_LO_REF) |
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MC44S803_REG_SM(1, MC44S803_AT);
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err = mc44s803_writereg(priv, val);
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if (err)
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goto exit;
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if (fe->ops.i2c_gate_ctrl)
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fe->ops.i2c_gate_ctrl(fe, 0);
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return 0;
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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);
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mc_printk(KERN_WARNING, "I/O Error\n");
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return err;
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}
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static int mc44s803_get_frequency(struct dvb_frontend *fe, u32 *frequency)
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{
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struct mc44s803_priv *priv = fe->tuner_priv;
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*frequency = priv->frequency;
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return 0;
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}
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static int mc44s803_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
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{
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*frequency = MC44S803_IF2; /* 36.125 MHz */
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return 0;
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}
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static const struct dvb_tuner_ops mc44s803_tuner_ops = {
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.info = {
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.name = "Freescale MC44S803",
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.frequency_min_hz = 48 * MHz,
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.frequency_max_hz = 1000 * MHz,
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.frequency_step_hz = 100 * kHz,
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},
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.release = mc44s803_release,
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.init = mc44s803_init,
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.set_params = mc44s803_set_params,
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.get_frequency = mc44s803_get_frequency,
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.get_if_frequency = mc44s803_get_if_frequency,
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};
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/* This functions tries to identify a MC44S803 tuner by reading the ID
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register. This is hasty. */
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struct dvb_frontend *mc44s803_attach(struct dvb_frontend *fe,
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struct i2c_adapter *i2c, struct mc44s803_config *cfg)
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{
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struct mc44s803_priv *priv;
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u32 reg;
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u8 id;
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int ret;
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reg = 0;
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priv = kzalloc(sizeof(struct mc44s803_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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priv->fe = fe;
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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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ret = mc44s803_readreg(priv, MC44S803_REG_ID, ®);
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if (ret)
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goto error;
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id = MC44S803_REG_MS(reg, MC44S803_ID);
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if (id != 0x14) {
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mc_printk(KERN_ERR, "unsupported ID (%x should be 0x14)\n",
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id);
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goto error;
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}
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mc_printk(KERN_INFO, "successfully identified (ID = %x)\n", id);
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memcpy(&fe->ops.tuner_ops, &mc44s803_tuner_ops,
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sizeof(struct dvb_tuner_ops));
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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, 0); /* close i2c_gate */
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return fe;
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error:
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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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kfree(priv);
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return NULL;
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}
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EXPORT_SYMBOL(mc44s803_attach);
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MODULE_AUTHOR("Jochen Friedrich");
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MODULE_DESCRIPTION("Freescale MC44S803 silicon tuner driver");
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MODULE_LICENSE("GPL");
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