621 lines
14 KiB
C
621 lines
14 KiB
C
/*
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Driver for Spase SP8870 demodulator
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Copyright (C) 1999 Juergen Peitz
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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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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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GNU General Public License for more details.
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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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/*
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* This driver needs external firmware. Please use the command
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* "<kerneldir>/Documentation/dvb/get_dvb_firmware alps_tdlb7" to
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* download/extract it, and then copy it to /usr/lib/hotplug/firmware
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* or /lib/firmware (depending on configuration of firmware hotplug).
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*/
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#define SP8870_DEFAULT_FIRMWARE "dvb-fe-sp8870.fw"
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/firmware.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 "sp8870.h"
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struct sp8870_state {
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struct i2c_adapter* i2c;
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const struct sp8870_config* config;
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struct dvb_frontend frontend;
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/* demodulator private data */
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u8 initialised:1;
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};
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static int debug;
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#define dprintk(args...) \
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do { \
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if (debug) printk(KERN_DEBUG "sp8870: " args); \
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} while (0)
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/* firmware size for sp8870 */
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#define SP8870_FIRMWARE_SIZE 16382
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/* starting point for firmware in file 'Sc_main.mc' */
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#define SP8870_FIRMWARE_OFFSET 0x0A
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static int sp8870_writereg (struct sp8870_state* state, u16 reg, u16 data)
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{
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u8 buf [] = { reg >> 8, reg & 0xff, data >> 8, data & 0xff };
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struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 4 };
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int err;
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if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
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dprintk ("%s: writereg error (err == %i, reg == 0x%02x, data == 0x%02x)\n", __func__, err, reg, data);
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return -EREMOTEIO;
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}
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return 0;
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}
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static int sp8870_readreg (struct sp8870_state* state, u16 reg)
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{
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int ret;
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u8 b0 [] = { reg >> 8 , reg & 0xff };
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u8 b1 [] = { 0, 0 };
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struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 2 },
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{ .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 2 } };
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ret = i2c_transfer (state->i2c, msg, 2);
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if (ret != 2) {
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dprintk("%s: readreg error (ret == %i)\n", __func__, ret);
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return -1;
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}
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return (b1[0] << 8 | b1[1]);
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}
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static int sp8870_firmware_upload (struct sp8870_state* state, const struct firmware *fw)
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{
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struct i2c_msg msg;
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const char *fw_buf = fw->data;
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int fw_pos;
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u8 tx_buf[255];
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int tx_len;
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int err = 0;
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dprintk ("%s: ...\n", __func__);
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if (fw->size < SP8870_FIRMWARE_SIZE + SP8870_FIRMWARE_OFFSET)
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return -EINVAL;
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// system controller stop
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sp8870_writereg(state, 0x0F00, 0x0000);
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// instruction RAM register hiword
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sp8870_writereg(state, 0x8F08, ((SP8870_FIRMWARE_SIZE / 2) & 0xFFFF));
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// instruction RAM MWR
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sp8870_writereg(state, 0x8F0A, ((SP8870_FIRMWARE_SIZE / 2) >> 16));
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// do firmware upload
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fw_pos = SP8870_FIRMWARE_OFFSET;
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while (fw_pos < SP8870_FIRMWARE_SIZE + SP8870_FIRMWARE_OFFSET){
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tx_len = (fw_pos <= SP8870_FIRMWARE_SIZE + SP8870_FIRMWARE_OFFSET - 252) ? 252 : SP8870_FIRMWARE_SIZE + SP8870_FIRMWARE_OFFSET - fw_pos;
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// write register 0xCF0A
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tx_buf[0] = 0xCF;
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tx_buf[1] = 0x0A;
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memcpy(&tx_buf[2], fw_buf + fw_pos, tx_len);
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msg.addr = state->config->demod_address;
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msg.flags = 0;
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msg.buf = tx_buf;
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msg.len = tx_len + 2;
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if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
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printk("%s: firmware upload failed!\n", __func__);
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printk ("%s: i2c error (err == %i)\n", __func__, err);
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return err;
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}
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fw_pos += tx_len;
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}
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dprintk ("%s: done!\n", __func__);
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return 0;
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};
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static void sp8870_microcontroller_stop (struct sp8870_state* state)
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{
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sp8870_writereg(state, 0x0F08, 0x000);
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sp8870_writereg(state, 0x0F09, 0x000);
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// microcontroller STOP
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sp8870_writereg(state, 0x0F00, 0x000);
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}
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static void sp8870_microcontroller_start (struct sp8870_state* state)
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{
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sp8870_writereg(state, 0x0F08, 0x000);
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sp8870_writereg(state, 0x0F09, 0x000);
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// microcontroller START
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sp8870_writereg(state, 0x0F00, 0x001);
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// not documented but if we don't read 0x0D01 out here
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// we don't get a correct data valid signal
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sp8870_readreg(state, 0x0D01);
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}
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static int sp8870_read_data_valid_signal(struct sp8870_state* state)
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{
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return (sp8870_readreg(state, 0x0D02) > 0);
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}
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static int configure_reg0xc05 (struct dtv_frontend_properties *p, u16 *reg0xc05)
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{
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int known_parameters = 1;
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*reg0xc05 = 0x000;
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switch (p->modulation) {
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case QPSK:
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break;
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case QAM_16:
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*reg0xc05 |= (1 << 10);
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break;
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case QAM_64:
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*reg0xc05 |= (2 << 10);
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break;
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case QAM_AUTO:
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known_parameters = 0;
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break;
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default:
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return -EINVAL;
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}
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switch (p->hierarchy) {
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case HIERARCHY_NONE:
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break;
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case HIERARCHY_1:
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*reg0xc05 |= (1 << 7);
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break;
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case HIERARCHY_2:
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*reg0xc05 |= (2 << 7);
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break;
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case HIERARCHY_4:
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*reg0xc05 |= (3 << 7);
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break;
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case HIERARCHY_AUTO:
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known_parameters = 0;
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break;
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default:
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return -EINVAL;
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}
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switch (p->code_rate_HP) {
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case FEC_1_2:
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break;
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case FEC_2_3:
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*reg0xc05 |= (1 << 3);
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break;
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case FEC_3_4:
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*reg0xc05 |= (2 << 3);
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break;
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case FEC_5_6:
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*reg0xc05 |= (3 << 3);
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break;
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case FEC_7_8:
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*reg0xc05 |= (4 << 3);
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break;
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case FEC_AUTO:
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known_parameters = 0;
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break;
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default:
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return -EINVAL;
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}
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if (known_parameters)
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*reg0xc05 |= (2 << 1); /* use specified parameters */
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else
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*reg0xc05 |= (1 << 1); /* enable autoprobing */
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return 0;
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}
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static int sp8870_wake_up(struct sp8870_state* state)
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{
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// enable TS output and interface pins
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return sp8870_writereg(state, 0xC18, 0x00D);
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}
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static int sp8870_set_frontend_parameters(struct dvb_frontend *fe)
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{
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struct dtv_frontend_properties *p = &fe->dtv_property_cache;
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struct sp8870_state* state = fe->demodulator_priv;
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int err;
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u16 reg0xc05;
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if ((err = configure_reg0xc05(p, ®0xc05)))
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return err;
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// system controller stop
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sp8870_microcontroller_stop(state);
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// set tuner parameters
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if (fe->ops.tuner_ops.set_params) {
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fe->ops.tuner_ops.set_params(fe);
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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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// sample rate correction bit [23..17]
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sp8870_writereg(state, 0x0319, 0x000A);
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// sample rate correction bit [16..0]
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sp8870_writereg(state, 0x031A, 0x0AAB);
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// integer carrier offset
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sp8870_writereg(state, 0x0309, 0x0400);
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// fractional carrier offset
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sp8870_writereg(state, 0x030A, 0x0000);
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// filter for 6/7/8 Mhz channel
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if (p->bandwidth_hz == 6000000)
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sp8870_writereg(state, 0x0311, 0x0002);
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else if (p->bandwidth_hz == 7000000)
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sp8870_writereg(state, 0x0311, 0x0001);
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else
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sp8870_writereg(state, 0x0311, 0x0000);
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// scan order: 2k first = 0x0000, 8k first = 0x0001
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if (p->transmission_mode == TRANSMISSION_MODE_2K)
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sp8870_writereg(state, 0x0338, 0x0000);
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else
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sp8870_writereg(state, 0x0338, 0x0001);
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sp8870_writereg(state, 0xc05, reg0xc05);
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// read status reg in order to clear pending irqs
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sp8870_readreg(state, 0x200);
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// system controller start
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sp8870_microcontroller_start(state);
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return 0;
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}
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static int sp8870_init (struct dvb_frontend* fe)
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{
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struct sp8870_state* state = fe->demodulator_priv;
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const struct firmware *fw = NULL;
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sp8870_wake_up(state);
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if (state->initialised) return 0;
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state->initialised = 1;
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dprintk ("%s\n", __func__);
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/* request the firmware, this will block until someone uploads it */
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printk("sp8870: waiting for firmware upload (%s)...\n", SP8870_DEFAULT_FIRMWARE);
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if (state->config->request_firmware(fe, &fw, SP8870_DEFAULT_FIRMWARE)) {
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printk("sp8870: no firmware upload (timeout or file not found?)\n");
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return -EIO;
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}
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if (sp8870_firmware_upload(state, fw)) {
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printk("sp8870: writing firmware to device failed\n");
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release_firmware(fw);
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return -EIO;
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}
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release_firmware(fw);
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printk("sp8870: firmware upload complete\n");
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/* enable TS output and interface pins */
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sp8870_writereg(state, 0xc18, 0x00d);
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// system controller stop
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sp8870_microcontroller_stop(state);
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// ADC mode
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sp8870_writereg(state, 0x0301, 0x0003);
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// Reed Solomon parity bytes passed to output
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sp8870_writereg(state, 0x0C13, 0x0001);
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// MPEG clock is suppressed if no valid data
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sp8870_writereg(state, 0x0C14, 0x0001);
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/* bit 0x010: enable data valid signal */
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sp8870_writereg(state, 0x0D00, 0x010);
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sp8870_writereg(state, 0x0D01, 0x000);
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return 0;
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}
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static int sp8870_read_status(struct dvb_frontend *fe,
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enum fe_status *fe_status)
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{
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struct sp8870_state* state = fe->demodulator_priv;
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int status;
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int signal;
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*fe_status = 0;
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status = sp8870_readreg (state, 0x0200);
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if (status < 0)
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return -EIO;
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signal = sp8870_readreg (state, 0x0303);
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if (signal < 0)
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return -EIO;
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if (signal > 0x0F)
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*fe_status |= FE_HAS_SIGNAL;
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if (status & 0x08)
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*fe_status |= FE_HAS_SYNC;
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if (status & 0x04)
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*fe_status |= FE_HAS_LOCK | FE_HAS_CARRIER | FE_HAS_VITERBI;
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return 0;
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}
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static int sp8870_read_ber (struct dvb_frontend* fe, u32 * ber)
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{
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struct sp8870_state* state = fe->demodulator_priv;
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int ret;
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u32 tmp;
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*ber = 0;
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ret = sp8870_readreg(state, 0xC08);
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if (ret < 0)
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return -EIO;
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tmp = ret & 0x3F;
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ret = sp8870_readreg(state, 0xC07);
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if (ret < 0)
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return -EIO;
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tmp = ret << 6;
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if (tmp >= 0x3FFF0)
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tmp = ~0;
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*ber = tmp;
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return 0;
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}
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static int sp8870_read_signal_strength(struct dvb_frontend* fe, u16 * signal)
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{
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struct sp8870_state* state = fe->demodulator_priv;
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int ret;
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u16 tmp;
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*signal = 0;
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ret = sp8870_readreg (state, 0x306);
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if (ret < 0)
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return -EIO;
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tmp = ret << 8;
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ret = sp8870_readreg (state, 0x303);
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if (ret < 0)
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return -EIO;
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tmp |= ret;
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if (tmp)
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*signal = 0xFFFF - tmp;
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return 0;
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}
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static int sp8870_read_uncorrected_blocks (struct dvb_frontend* fe, u32* ublocks)
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{
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struct sp8870_state* state = fe->demodulator_priv;
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int ret;
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*ublocks = 0;
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ret = sp8870_readreg(state, 0xC0C);
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if (ret < 0)
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return -EIO;
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if (ret == 0xFFFF)
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ret = ~0;
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*ublocks = ret;
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return 0;
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}
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/* number of trials to recover from lockup */
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#define MAXTRIALS 5
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/* maximum checks for data valid signal */
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#define MAXCHECKS 100
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/* only for debugging: counter for detected lockups */
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static int lockups;
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/* only for debugging: counter for channel switches */
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static int switches;
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static int sp8870_set_frontend(struct dvb_frontend *fe)
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{
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struct dtv_frontend_properties *p = &fe->dtv_property_cache;
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struct sp8870_state* state = fe->demodulator_priv;
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/*
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The firmware of the sp8870 sometimes locks up after setting frontend parameters.
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We try to detect this by checking the data valid signal.
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If it is not set after MAXCHECKS we try to recover the lockup by setting
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the frontend parameters again.
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*/
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int err = 0;
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int valid = 0;
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int trials = 0;
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int check_count = 0;
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dprintk("%s: frequency = %i\n", __func__, p->frequency);
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for (trials = 1; trials <= MAXTRIALS; trials++) {
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err = sp8870_set_frontend_parameters(fe);
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if (err)
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return err;
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for (check_count = 0; check_count < MAXCHECKS; check_count++) {
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// valid = ((sp8870_readreg(i2c, 0x0200) & 4) == 0);
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valid = sp8870_read_data_valid_signal(state);
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if (valid) {
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dprintk("%s: delay = %i usec\n",
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__func__, check_count * 10);
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break;
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}
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udelay(10);
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}
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if (valid)
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break;
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}
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if (!valid) {
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printk("%s: firmware crash!!!!!!\n", __func__);
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return -EIO;
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}
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if (debug) {
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if (valid) {
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if (trials > 1) {
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printk("%s: firmware lockup!!!\n", __func__);
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printk("%s: recovered after %i trial(s))\n", __func__, trials - 1);
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lockups++;
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}
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}
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switches++;
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printk("%s: switches = %i lockups = %i\n", __func__, switches, lockups);
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}
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return 0;
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}
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static int sp8870_sleep(struct dvb_frontend* fe)
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{
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struct sp8870_state* state = fe->demodulator_priv;
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// tristate TS output and disable interface pins
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return sp8870_writereg(state, 0xC18, 0x000);
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}
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static int sp8870_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
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{
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fesettings->min_delay_ms = 350;
|
|
fesettings->step_size = 0;
|
|
fesettings->max_drift = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int sp8870_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
|
|
{
|
|
struct sp8870_state* state = fe->demodulator_priv;
|
|
|
|
if (enable) {
|
|
return sp8870_writereg(state, 0x206, 0x001);
|
|
} else {
|
|
return sp8870_writereg(state, 0x206, 0x000);
|
|
}
|
|
}
|
|
|
|
static void sp8870_release(struct dvb_frontend* fe)
|
|
{
|
|
struct sp8870_state* state = fe->demodulator_priv;
|
|
kfree(state);
|
|
}
|
|
|
|
static struct dvb_frontend_ops sp8870_ops;
|
|
|
|
struct dvb_frontend* sp8870_attach(const struct sp8870_config* config,
|
|
struct i2c_adapter* i2c)
|
|
{
|
|
struct sp8870_state* state = NULL;
|
|
|
|
/* allocate memory for the internal state */
|
|
state = kzalloc(sizeof(struct sp8870_state), GFP_KERNEL);
|
|
if (state == NULL) goto error;
|
|
|
|
/* setup the state */
|
|
state->config = config;
|
|
state->i2c = i2c;
|
|
state->initialised = 0;
|
|
|
|
/* check if the demod is there */
|
|
if (sp8870_readreg(state, 0x0200) < 0) goto error;
|
|
|
|
/* create dvb_frontend */
|
|
memcpy(&state->frontend.ops, &sp8870_ops, sizeof(struct dvb_frontend_ops));
|
|
state->frontend.demodulator_priv = state;
|
|
return &state->frontend;
|
|
|
|
error:
|
|
kfree(state);
|
|
return NULL;
|
|
}
|
|
|
|
static struct dvb_frontend_ops sp8870_ops = {
|
|
.delsys = { SYS_DVBT },
|
|
.info = {
|
|
.name = "Spase SP8870 DVB-T",
|
|
.frequency_min = 470000000,
|
|
.frequency_max = 860000000,
|
|
.frequency_stepsize = 166666,
|
|
.caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 |
|
|
FE_CAN_FEC_3_4 | FE_CAN_FEC_5_6 |
|
|
FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
|
|
FE_CAN_QPSK | FE_CAN_QAM_16 |
|
|
FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
|
|
FE_CAN_HIERARCHY_AUTO | FE_CAN_RECOVER
|
|
},
|
|
|
|
.release = sp8870_release,
|
|
|
|
.init = sp8870_init,
|
|
.sleep = sp8870_sleep,
|
|
.i2c_gate_ctrl = sp8870_i2c_gate_ctrl,
|
|
|
|
.set_frontend = sp8870_set_frontend,
|
|
.get_tune_settings = sp8870_get_tune_settings,
|
|
|
|
.read_status = sp8870_read_status,
|
|
.read_ber = sp8870_read_ber,
|
|
.read_signal_strength = sp8870_read_signal_strength,
|
|
.read_ucblocks = sp8870_read_uncorrected_blocks,
|
|
};
|
|
|
|
module_param(debug, int, 0644);
|
|
MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
|
|
|
|
MODULE_DESCRIPTION("Spase SP8870 DVB-T Demodulator driver");
|
|
MODULE_AUTHOR("Juergen Peitz");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
EXPORT_SYMBOL(sp8870_attach);
|