mirror of https://gitee.com/openkylin/linux.git
339 lines
8.6 KiB
C
339 lines
8.6 KiB
C
/*
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* Driver for Zarlink DVB-T ZL10353 demodulator
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*
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* Copyright (C) 2006 Christopher Pascoe <c.pascoe@itee.uq.edu.au>
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.=
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include "dvb_frontend.h"
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#include "zl10353_priv.h"
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#include "zl10353.h"
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struct zl10353_state {
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struct i2c_adapter *i2c;
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struct dvb_frontend frontend;
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struct zl10353_config config;
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};
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static int debug_regs = 0;
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static int zl10353_single_write(struct dvb_frontend *fe, u8 reg, u8 val)
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{
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struct zl10353_state *state = fe->demodulator_priv;
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u8 buf[2] = { reg, val };
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struct i2c_msg msg = { .addr = state->config.demod_address, .flags = 0,
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.buf = buf, .len = 2 };
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int err = i2c_transfer(state->i2c, &msg, 1);
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if (err != 1) {
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printk("zl10353: write to reg %x failed (err = %d)!\n", reg, err);
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return err;
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}
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return 0;
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}
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int zl10353_write(struct dvb_frontend *fe, u8 *ibuf, int ilen)
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{
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int err, i;
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for (i = 0; i < ilen - 1; i++)
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if ((err = zl10353_single_write(fe, ibuf[0] + i, ibuf[i + 1])))
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return err;
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return 0;
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}
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static int zl10353_read_register(struct zl10353_state *state, u8 reg)
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{
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int ret;
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u8 b0[1] = { reg };
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u8 b1[1] = { 0 };
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struct i2c_msg msg[2] = { { .addr = state->config.demod_address,
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.flags = 0,
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.buf = b0, .len = 1 },
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{ .addr = state->config.demod_address,
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.flags = I2C_M_RD,
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.buf = b1, .len = 1 } };
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ret = i2c_transfer(state->i2c, msg, 2);
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if (ret != 2) {
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printk("%s: readreg error (reg=%d, ret==%i)\n",
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__FUNCTION__, reg, ret);
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return ret;
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}
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return b1[0];
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}
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static void zl10353_dump_regs(struct dvb_frontend *fe)
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{
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struct zl10353_state *state = fe->demodulator_priv;
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char buf[52], buf2[4];
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int ret;
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u8 reg;
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/* Dump all registers. */
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for (reg = 0; ; reg++) {
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if (reg % 16 == 0) {
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if (reg)
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printk(KERN_DEBUG "%s\n", buf);
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sprintf(buf, "%02x: ", reg);
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}
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ret = zl10353_read_register(state, reg);
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if (ret >= 0)
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sprintf(buf2, "%02x ", (u8)ret);
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else
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strcpy(buf2, "-- ");
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strcat(buf, buf2);
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if (reg == 0xff)
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break;
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}
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printk(KERN_DEBUG "%s\n", buf);
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}
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static int zl10353_sleep(struct dvb_frontend *fe)
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{
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static u8 zl10353_softdown[] = { 0x50, 0x0C, 0x44 };
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zl10353_write(fe, zl10353_softdown, sizeof(zl10353_softdown));
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return 0;
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}
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static int zl10353_set_parameters(struct dvb_frontend *fe,
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struct dvb_frontend_parameters *param)
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{
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struct zl10353_state *state = fe->demodulator_priv;
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u8 pllbuf[6] = { 0x67 };
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/* These settings set "auto-everything" and start the FSM. */
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zl10353_single_write(fe, 0x55, 0x80);
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udelay(200);
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zl10353_single_write(fe, 0xEA, 0x01);
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udelay(200);
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zl10353_single_write(fe, 0xEA, 0x00);
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zl10353_single_write(fe, 0x56, 0x28);
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zl10353_single_write(fe, 0x89, 0x20);
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zl10353_single_write(fe, 0x5E, 0x00);
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zl10353_single_write(fe, 0x65, 0x5A);
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zl10353_single_write(fe, 0x66, 0xE9);
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zl10353_single_write(fe, 0x6C, 0xCD);
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zl10353_single_write(fe, 0x6D, 0x7E);
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zl10353_single_write(fe, 0x62, 0x0A);
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// if there is no attached secondary tuner, we call set_params to program
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// a potential tuner attached somewhere else
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if (state->config.no_tuner) {
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if (fe->ops.tuner_ops.set_params) {
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fe->ops.tuner_ops.set_params(fe, param);
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if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
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}
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}
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// if pllbuf is defined, retrieve the settings
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if (fe->ops.tuner_ops.calc_regs) {
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fe->ops.tuner_ops.calc_regs(fe, param, pllbuf+1, 5);
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pllbuf[1] <<= 1;
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} else {
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// fake pllbuf settings
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pllbuf[1] = 0x61 << 1;
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pllbuf[2] = 0;
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pllbuf[3] = 0;
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pllbuf[3] = 0;
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pllbuf[4] = 0;
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}
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// there is no call to _just_ start decoding, so we send the pllbuf anyway
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// even if there isn't a PLL attached to the secondary bus
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zl10353_write(fe, pllbuf, sizeof(pllbuf));
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zl10353_single_write(fe, 0x5F, 0x13);
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zl10353_single_write(fe, 0x70, 0x01);
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udelay(250);
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zl10353_single_write(fe, 0xE4, 0x00);
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zl10353_single_write(fe, 0xE5, 0x2A);
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zl10353_single_write(fe, 0xE9, 0x02);
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zl10353_single_write(fe, 0xE7, 0x40);
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zl10353_single_write(fe, 0xE8, 0x10);
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return 0;
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}
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static int zl10353_read_status(struct dvb_frontend *fe, fe_status_t *status)
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{
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struct zl10353_state *state = fe->demodulator_priv;
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int s6, s7, s8;
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if ((s6 = zl10353_read_register(state, STATUS_6)) < 0)
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return -EREMOTEIO;
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if ((s7 = zl10353_read_register(state, STATUS_7)) < 0)
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return -EREMOTEIO;
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if ((s8 = zl10353_read_register(state, STATUS_8)) < 0)
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return -EREMOTEIO;
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*status = 0;
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if (s6 & (1 << 2))
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*status |= FE_HAS_CARRIER;
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if (s6 & (1 << 1))
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*status |= FE_HAS_VITERBI;
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if (s6 & (1 << 5))
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*status |= FE_HAS_LOCK;
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if (s7 & (1 << 4))
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*status |= FE_HAS_SYNC;
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if (s8 & (1 << 6))
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*status |= FE_HAS_SIGNAL;
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if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
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(FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))
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*status &= ~FE_HAS_LOCK;
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return 0;
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}
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static int zl10353_read_snr(struct dvb_frontend *fe, u16 *snr)
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{
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struct zl10353_state *state = fe->demodulator_priv;
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u8 _snr;
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if (debug_regs)
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zl10353_dump_regs(fe);
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_snr = zl10353_read_register(state, SNR);
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*snr = (_snr << 8) | _snr;
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return 0;
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}
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static int zl10353_get_tune_settings(struct dvb_frontend *fe,
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struct dvb_frontend_tune_settings
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*fe_tune_settings)
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{
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fe_tune_settings->min_delay_ms = 1000;
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fe_tune_settings->step_size = 0;
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fe_tune_settings->max_drift = 0;
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return 0;
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}
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static int zl10353_init(struct dvb_frontend *fe)
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{
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struct zl10353_state *state = fe->demodulator_priv;
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u8 zl10353_reset_attach[6] = { 0x50, 0x03, 0x64, 0x46, 0x15, 0x0F };
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int rc = 0;
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if (debug_regs)
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zl10353_dump_regs(fe);
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if (state->config.parallel_ts)
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zl10353_reset_attach[2] &= ~0x20;
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/* Do a "hard" reset if not already done */
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if (zl10353_read_register(state, 0x50) != zl10353_reset_attach[1] ||
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zl10353_read_register(state, 0x51) != zl10353_reset_attach[2]) {
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rc = zl10353_write(fe, zl10353_reset_attach,
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sizeof(zl10353_reset_attach));
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if (debug_regs)
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zl10353_dump_regs(fe);
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}
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return 0;
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}
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static void zl10353_release(struct dvb_frontend *fe)
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{
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struct zl10353_state *state = fe->demodulator_priv;
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kfree(state);
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}
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static struct dvb_frontend_ops zl10353_ops;
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struct dvb_frontend *zl10353_attach(const struct zl10353_config *config,
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struct i2c_adapter *i2c)
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{
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struct zl10353_state *state = NULL;
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/* allocate memory for the internal state */
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state = kzalloc(sizeof(struct zl10353_state), GFP_KERNEL);
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if (state == NULL)
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goto error;
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/* setup the state */
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state->i2c = i2c;
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memcpy(&state->config, config, sizeof(struct zl10353_config));
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/* check if the demod is there */
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if (zl10353_read_register(state, CHIP_ID) != ID_ZL10353)
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goto error;
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/* create dvb_frontend */
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memcpy(&state->frontend.ops, &zl10353_ops, sizeof(struct dvb_frontend_ops));
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state->frontend.demodulator_priv = state;
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return &state->frontend;
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error:
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kfree(state);
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return NULL;
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}
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static struct dvb_frontend_ops zl10353_ops = {
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.info = {
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.name = "Zarlink ZL10353 DVB-T",
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.type = FE_OFDM,
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.frequency_min = 174000000,
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.frequency_max = 862000000,
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.frequency_stepsize = 166667,
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.frequency_tolerance = 0,
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.caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 |
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FE_CAN_FEC_3_4 | FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
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FE_CAN_FEC_AUTO |
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FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
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FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
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FE_CAN_HIERARCHY_AUTO | FE_CAN_RECOVER |
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FE_CAN_MUTE_TS
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},
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.release = zl10353_release,
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.init = zl10353_init,
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.sleep = zl10353_sleep,
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.write = zl10353_write,
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.set_frontend = zl10353_set_parameters,
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.get_tune_settings = zl10353_get_tune_settings,
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.read_status = zl10353_read_status,
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.read_snr = zl10353_read_snr,
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};
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module_param(debug_regs, int, 0644);
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MODULE_PARM_DESC(debug_regs, "Turn on/off frontend register dumps (default:off).");
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MODULE_DESCRIPTION("Zarlink ZL10353 DVB-T demodulator driver");
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MODULE_AUTHOR("Chris Pascoe");
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MODULE_LICENSE("GPL");
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EXPORT_SYMBOL(zl10353_attach);
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