448 lines
10 KiB
C
448 lines
10 KiB
C
/*
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* stv6110.c
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*
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* Driver for ST STV6110 satellite tuner IC.
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*
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* Copyright (C) 2009 NetUP Inc.
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* Copyright (C) 2009 Igor M. Liplianin <liplianin@netup.ru>
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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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*
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* GNU General Public License for more details.
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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/dvb/frontend.h>
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#include <linux/types.h>
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#include "stv6110.h"
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/* Max transfer size done by I2C transfer functions */
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#define MAX_XFER_SIZE 64
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static int debug;
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struct stv6110_priv {
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int i2c_address;
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struct i2c_adapter *i2c;
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u32 mclk;
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u8 clk_div;
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u8 gain;
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u8 regs[8];
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};
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#define dprintk(args...) \
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do { \
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if (debug) \
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printk(KERN_DEBUG args); \
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} while (0)
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static s32 abssub(s32 a, s32 b)
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{
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if (a > b)
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return a - b;
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else
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return b - a;
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};
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static void stv6110_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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}
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static int stv6110_write_regs(struct dvb_frontend *fe, u8 buf[],
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int start, int len)
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{
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struct stv6110_priv *priv = fe->tuner_priv;
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int rc;
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u8 cmdbuf[MAX_XFER_SIZE];
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struct i2c_msg msg = {
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.addr = priv->i2c_address,
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.flags = 0,
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.buf = cmdbuf,
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.len = len + 1
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};
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dprintk("%s\n", __func__);
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if (1 + len > sizeof(cmdbuf)) {
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printk(KERN_WARNING
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"%s: i2c wr: len=%d is too big!\n",
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KBUILD_MODNAME, len);
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return -EINVAL;
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}
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if (start + len > 8)
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return -EINVAL;
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memcpy(&cmdbuf[1], buf, len);
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cmdbuf[0] = start;
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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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rc = i2c_transfer(priv->i2c, &msg, 1);
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if (rc != 1)
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dprintk("%s: i2c error\n", __func__);
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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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}
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static int stv6110_read_regs(struct dvb_frontend *fe, u8 regs[],
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int start, int len)
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{
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struct stv6110_priv *priv = fe->tuner_priv;
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int rc;
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u8 reg[] = { start };
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struct i2c_msg msg[] = {
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{
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.addr = priv->i2c_address,
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.flags = 0,
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.buf = reg,
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.len = 1,
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}, {
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.addr = priv->i2c_address,
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.flags = I2C_M_RD,
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.buf = regs,
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.len = len,
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},
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};
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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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rc = i2c_transfer(priv->i2c, msg, 2);
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if (rc != 2)
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dprintk("%s: i2c error\n", __func__);
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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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memcpy(&priv->regs[start], regs, len);
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return 0;
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}
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static int stv6110_read_reg(struct dvb_frontend *fe, int start)
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{
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u8 buf[] = { 0 };
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stv6110_read_regs(fe, buf, start, 1);
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return buf[0];
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}
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static int stv6110_sleep(struct dvb_frontend *fe)
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{
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u8 reg[] = { 0 };
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stv6110_write_regs(fe, reg, 0, 1);
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return 0;
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}
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static u32 carrier_width(u32 symbol_rate, enum fe_rolloff rolloff)
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{
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u32 rlf;
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switch (rolloff) {
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case ROLLOFF_20:
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rlf = 20;
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break;
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case ROLLOFF_25:
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rlf = 25;
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break;
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default:
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rlf = 35;
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break;
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}
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return symbol_rate + ((symbol_rate * rlf) / 100);
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}
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static int stv6110_set_bandwidth(struct dvb_frontend *fe, u32 bandwidth)
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{
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struct stv6110_priv *priv = fe->tuner_priv;
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u8 r8, ret = 0x04;
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int i;
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if ((bandwidth / 2) > 36000000) /*BW/2 max=31+5=36 mhz for r8=31*/
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r8 = 31;
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else if ((bandwidth / 2) < 5000000) /* BW/2 min=5Mhz for F=0 */
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r8 = 0;
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else /*if 5 < BW/2 < 36*/
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r8 = (bandwidth / 2) / 1000000 - 5;
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/* ctrl3, RCCLKOFF = 0 Activate the calibration Clock */
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/* ctrl3, CF = r8 Set the LPF value */
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priv->regs[RSTV6110_CTRL3] &= ~((1 << 6) | 0x1f);
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priv->regs[RSTV6110_CTRL3] |= (r8 & 0x1f);
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stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL3], RSTV6110_CTRL3, 1);
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/* stat1, CALRCSTRT = 1 Start LPF auto calibration*/
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priv->regs[RSTV6110_STAT1] |= 0x02;
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stv6110_write_regs(fe, &priv->regs[RSTV6110_STAT1], RSTV6110_STAT1, 1);
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i = 0;
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/* Wait for CALRCSTRT == 0 */
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while ((i < 10) && (ret != 0)) {
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ret = ((stv6110_read_reg(fe, RSTV6110_STAT1)) & 0x02);
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mdelay(1); /* wait for LPF auto calibration */
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i++;
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}
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/* RCCLKOFF = 1 calibration done, deactivate the calibration Clock */
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priv->regs[RSTV6110_CTRL3] |= (1 << 6);
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stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL3], RSTV6110_CTRL3, 1);
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return 0;
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}
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static int stv6110_init(struct dvb_frontend *fe)
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{
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struct stv6110_priv *priv = fe->tuner_priv;
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u8 buf0[] = { 0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e };
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memcpy(priv->regs, buf0, 8);
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/* K = (Reference / 1000000) - 16 */
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priv->regs[RSTV6110_CTRL1] &= ~(0x1f << 3);
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priv->regs[RSTV6110_CTRL1] |=
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((((priv->mclk / 1000000) - 16) & 0x1f) << 3);
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/* divisor value for the output clock */
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priv->regs[RSTV6110_CTRL2] &= ~0xc0;
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priv->regs[RSTV6110_CTRL2] |= (priv->clk_div << 6);
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stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL1], RSTV6110_CTRL1, 8);
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msleep(1);
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stv6110_set_bandwidth(fe, 72000000);
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return 0;
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}
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static int stv6110_get_frequency(struct dvb_frontend *fe, u32 *frequency)
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{
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struct stv6110_priv *priv = fe->tuner_priv;
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u32 nbsteps, divider, psd2, freq;
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u8 regs[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
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stv6110_read_regs(fe, regs, 0, 8);
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/*N*/
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divider = (priv->regs[RSTV6110_TUNING2] & 0x0f) << 8;
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divider += priv->regs[RSTV6110_TUNING1];
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/*R*/
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nbsteps = (priv->regs[RSTV6110_TUNING2] >> 6) & 3;
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/*p*/
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psd2 = (priv->regs[RSTV6110_TUNING2] >> 4) & 1;
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freq = divider * (priv->mclk / 1000);
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freq /= (1 << (nbsteps + psd2));
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freq /= 4;
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*frequency = freq;
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return 0;
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}
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static int stv6110_set_frequency(struct dvb_frontend *fe, u32 frequency)
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{
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struct stv6110_priv *priv = fe->tuner_priv;
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u8 ret = 0x04;
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u32 divider, ref, p, presc, i, result_freq, vco_freq;
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s32 p_calc, p_calc_opt = 1000, r_div, r_div_opt = 0, p_val;
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dprintk("%s, freq=%d kHz, mclk=%d Hz\n", __func__,
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frequency, priv->mclk);
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/* K = (Reference / 1000000) - 16 */
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priv->regs[RSTV6110_CTRL1] &= ~(0x1f << 3);
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priv->regs[RSTV6110_CTRL1] |=
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((((priv->mclk / 1000000) - 16) & 0x1f) << 3);
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/* BB_GAIN = db/2 */
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priv->regs[RSTV6110_CTRL2] &= ~0x0f;
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priv->regs[RSTV6110_CTRL2] |= (priv->gain & 0x0f);
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if (frequency <= 1023000) {
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p = 1;
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presc = 0;
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} else if (frequency <= 1300000) {
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p = 1;
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presc = 1;
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} else if (frequency <= 2046000) {
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p = 0;
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presc = 0;
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} else {
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p = 0;
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presc = 1;
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}
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/* DIV4SEL = p*/
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priv->regs[RSTV6110_TUNING2] &= ~(1 << 4);
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priv->regs[RSTV6110_TUNING2] |= (p << 4);
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/* PRESC32ON = presc */
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priv->regs[RSTV6110_TUNING2] &= ~(1 << 5);
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priv->regs[RSTV6110_TUNING2] |= (presc << 5);
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p_val = (int)(1 << (p + 1)) * 10;/* P = 2 or P = 4 */
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for (r_div = 0; r_div <= 3; r_div++) {
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p_calc = (priv->mclk / 100000);
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p_calc /= (1 << (r_div + 1));
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if ((abssub(p_calc, p_val)) < (abssub(p_calc_opt, p_val)))
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r_div_opt = r_div;
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p_calc_opt = (priv->mclk / 100000);
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p_calc_opt /= (1 << (r_div_opt + 1));
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}
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ref = priv->mclk / ((1 << (r_div_opt + 1)) * (1 << (p + 1)));
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divider = (((frequency * 1000) + (ref >> 1)) / ref);
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/* RDIV = r_div_opt */
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priv->regs[RSTV6110_TUNING2] &= ~(3 << 6);
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priv->regs[RSTV6110_TUNING2] |= (((r_div_opt) & 3) << 6);
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/* NDIV_MSB = MSB(divider) */
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priv->regs[RSTV6110_TUNING2] &= ~0x0f;
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priv->regs[RSTV6110_TUNING2] |= (((divider) >> 8) & 0x0f);
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/* NDIV_LSB, LSB(divider) */
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priv->regs[RSTV6110_TUNING1] = (divider & 0xff);
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/* CALVCOSTRT = 1 VCO Auto Calibration */
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priv->regs[RSTV6110_STAT1] |= 0x04;
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stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL1],
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RSTV6110_CTRL1, 8);
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i = 0;
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/* Wait for CALVCOSTRT == 0 */
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while ((i < 10) && (ret != 0)) {
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ret = ((stv6110_read_reg(fe, RSTV6110_STAT1)) & 0x04);
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msleep(1); /* wait for VCO auto calibration */
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i++;
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}
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ret = stv6110_read_reg(fe, RSTV6110_STAT1);
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stv6110_get_frequency(fe, &result_freq);
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vco_freq = divider * ((priv->mclk / 1000) / ((1 << (r_div_opt + 1))));
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dprintk("%s, stat1=%x, lo_freq=%d kHz, vco_frec=%d kHz\n", __func__,
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ret, result_freq, vco_freq);
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return 0;
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}
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static int stv6110_set_params(struct dvb_frontend *fe)
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{
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struct dtv_frontend_properties *c = &fe->dtv_property_cache;
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u32 bandwidth = carrier_width(c->symbol_rate, c->rolloff);
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stv6110_set_frequency(fe, c->frequency);
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stv6110_set_bandwidth(fe, bandwidth);
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return 0;
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}
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static int stv6110_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
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{
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struct stv6110_priv *priv = fe->tuner_priv;
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u8 r8 = 0;
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u8 regs[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
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stv6110_read_regs(fe, regs, 0, 8);
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/* CF */
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r8 = priv->regs[RSTV6110_CTRL3] & 0x1f;
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*bandwidth = (r8 + 5) * 2000000;/* x2 for ZIF tuner BW/2 = F+5 Mhz */
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return 0;
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}
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static const struct dvb_tuner_ops stv6110_tuner_ops = {
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.info = {
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.name = "ST STV6110",
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.frequency_min_hz = 950 * MHz,
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.frequency_max_hz = 2150 * MHz,
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.frequency_step_hz = 1 * MHz,
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},
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.init = stv6110_init,
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.release = stv6110_release,
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.sleep = stv6110_sleep,
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.set_params = stv6110_set_params,
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.get_frequency = stv6110_get_frequency,
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.set_frequency = stv6110_set_frequency,
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.get_bandwidth = stv6110_get_bandwidth,
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.set_bandwidth = stv6110_set_bandwidth,
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};
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struct dvb_frontend *stv6110_attach(struct dvb_frontend *fe,
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const struct stv6110_config *config,
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struct i2c_adapter *i2c)
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{
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struct stv6110_priv *priv = NULL;
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u8 reg0[] = { 0x00, 0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e };
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struct i2c_msg msg[] = {
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{
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.addr = config->i2c_address,
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.flags = 0,
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.buf = reg0,
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.len = 9
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}
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};
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int ret;
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/* divisor value for the output clock */
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reg0[2] &= ~0xc0;
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reg0[2] |= (config->clk_div << 6);
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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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ret = i2c_transfer(i2c, msg, 1);
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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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if (ret != 1)
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return NULL;
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priv = kzalloc(sizeof(struct stv6110_priv), GFP_KERNEL);
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if (priv == NULL)
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return NULL;
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priv->i2c_address = config->i2c_address;
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priv->i2c = i2c;
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priv->mclk = config->mclk;
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priv->clk_div = config->clk_div;
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priv->gain = config->gain;
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memcpy(&priv->regs, ®0[1], 8);
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memcpy(&fe->ops.tuner_ops, &stv6110_tuner_ops,
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sizeof(struct dvb_tuner_ops));
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fe->tuner_priv = priv;
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printk(KERN_INFO "STV6110 attached on addr=%x!\n", priv->i2c_address);
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return fe;
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}
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EXPORT_SYMBOL(stv6110_attach);
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
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MODULE_DESCRIPTION("ST STV6110 driver");
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MODULE_AUTHOR("Igor M. Liplianin");
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MODULE_LICENSE("GPL");
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