473 lines
11 KiB
C
473 lines
11 KiB
C
/* DVB USB compliant Linux driver for the Friio USB2.0 ISDB-T receiver.
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*
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* Copyright (C) 2009 Akihiro Tsukada <tskd2@yahoo.co.jp>
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*
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* This module is based off the the gl861 and vp702x modules.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation, version 2.
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*
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* see Documentation/dvb/README.dvb-usb for more information
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*/
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include "friio.h"
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struct jdvbt90502_state {
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struct i2c_adapter *i2c;
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struct dvb_frontend frontend;
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struct jdvbt90502_config config;
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};
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/* NOTE: TC90502 has 16bit register-address? */
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/* register 0x0100 is used for reading PLL status, so reg is u16 here */
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static int jdvbt90502_reg_read(struct jdvbt90502_state *state,
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const u16 reg, u8 *buf, const size_t count)
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{
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int ret;
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u8 wbuf[3];
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struct i2c_msg msg[2];
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wbuf[0] = reg & 0xFF;
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wbuf[1] = 0;
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wbuf[2] = reg >> 8;
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msg[0].addr = state->config.demod_address;
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msg[0].flags = 0;
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msg[0].buf = wbuf;
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msg[0].len = sizeof(wbuf);
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msg[1].addr = msg[0].addr;
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msg[1].flags = I2C_M_RD;
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msg[1].buf = buf;
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msg[1].len = count;
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ret = i2c_transfer(state->i2c, msg, 2);
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if (ret != 2) {
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deb_fe(" reg read 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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/* currently 16bit register-address is not used, so reg is u8 here */
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static int jdvbt90502_single_reg_write(struct jdvbt90502_state *state,
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const u8 reg, const u8 val)
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{
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struct i2c_msg msg;
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u8 wbuf[2];
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wbuf[0] = reg;
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wbuf[1] = val;
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msg.addr = state->config.demod_address;
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msg.flags = 0;
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msg.buf = wbuf;
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msg.len = sizeof(wbuf);
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if (i2c_transfer(state->i2c, &msg, 1) != 1) {
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deb_fe(" reg write failed.");
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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 _jdvbt90502_write(struct dvb_frontend *fe, const u8 buf[], int len)
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{
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struct jdvbt90502_state *state = fe->demodulator_priv;
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int err, i;
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for (i = 0; i < len - 1; i++) {
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err = jdvbt90502_single_reg_write(state,
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buf[0] + i, buf[i + 1]);
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if (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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/* read pll status byte via the demodulator's I2C register */
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/* note: Win box reads it by 8B block at the I2C addr 0x30 from reg:0x80 */
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static int jdvbt90502_pll_read(struct jdvbt90502_state *state, u8 *result)
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{
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int ret;
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/* +1 for reading */
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u8 pll_addr_byte = (state->config.pll_address << 1) + 1;
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*result = 0;
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ret = jdvbt90502_single_reg_write(state, JDVBT90502_2ND_I2C_REG,
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pll_addr_byte);
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if (ret)
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goto error;
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ret = jdvbt90502_reg_read(state, 0x0100, result, 1);
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if (ret)
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goto error;
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deb_fe("PLL read val:%02x\n", *result);
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return 0;
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error:
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deb_fe("%s:ret == %d\n", __func__, ret);
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return -EREMOTEIO;
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}
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/* set pll frequency via the demodulator's I2C register */
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static int jdvbt90502_pll_set_freq(struct jdvbt90502_state *state, u32 freq)
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{
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int ret;
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int retry;
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u8 res1;
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u8 res2[9];
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u8 pll_freq_cmd[PLL_CMD_LEN];
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u8 pll_agc_cmd[PLL_CMD_LEN];
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struct i2c_msg msg[2];
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u32 f;
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deb_fe("%s: freq=%d, step=%d\n", __func__, freq,
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state->frontend.ops.info.frequency_stepsize);
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/* freq -> oscilator frequency conversion. */
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/* freq: 473,000,000 + n*6,000,000 [+ 142857 (center freq. shift)] */
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f = freq / state->frontend.ops.info.frequency_stepsize;
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/* add 399[1/7 MHZ] = 57MHz for the IF */
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f += 399;
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/* add center frequency shift if necessary */
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if (f % 7 == 0)
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f++;
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pll_freq_cmd[DEMOD_REDIRECT_REG] = JDVBT90502_2ND_I2C_REG; /* 0xFE */
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pll_freq_cmd[ADDRESS_BYTE] = state->config.pll_address << 1;
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pll_freq_cmd[DIVIDER_BYTE1] = (f >> 8) & 0x7F;
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pll_freq_cmd[DIVIDER_BYTE2] = f & 0xFF;
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pll_freq_cmd[CONTROL_BYTE] = 0xB2; /* ref.divider:28, 4MHz/28=1/7MHz */
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pll_freq_cmd[BANDSWITCH_BYTE] = 0x08; /* UHF band */
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msg[0].addr = state->config.demod_address;
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msg[0].flags = 0;
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msg[0].buf = pll_freq_cmd;
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msg[0].len = sizeof(pll_freq_cmd);
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ret = i2c_transfer(state->i2c, &msg[0], 1);
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if (ret != 1)
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goto error;
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udelay(50);
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pll_agc_cmd[DEMOD_REDIRECT_REG] = pll_freq_cmd[DEMOD_REDIRECT_REG];
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pll_agc_cmd[ADDRESS_BYTE] = pll_freq_cmd[ADDRESS_BYTE];
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pll_agc_cmd[DIVIDER_BYTE1] = pll_freq_cmd[DIVIDER_BYTE1];
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pll_agc_cmd[DIVIDER_BYTE2] = pll_freq_cmd[DIVIDER_BYTE2];
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pll_agc_cmd[CONTROL_BYTE] = 0x9A; /* AGC_CTRL instead of BANDSWITCH */
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pll_agc_cmd[AGC_CTRL_BYTE] = 0x50;
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/* AGC Time Constant 2s, AGC take-over point:103dBuV(lowest) */
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msg[1].addr = msg[0].addr;
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msg[1].flags = 0;
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msg[1].buf = pll_agc_cmd;
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msg[1].len = sizeof(pll_agc_cmd);
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ret = i2c_transfer(state->i2c, &msg[1], 1);
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if (ret != 1)
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goto error;
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/* I don't know what these cmds are for, */
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/* but the USB log on a windows box contains them */
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ret = jdvbt90502_single_reg_write(state, 0x01, 0x40);
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ret |= jdvbt90502_single_reg_write(state, 0x01, 0x00);
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if (ret)
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goto error;
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udelay(100);
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/* wait for the demod to be ready? */
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#define RETRY_COUNT 5
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for (retry = 0; retry < RETRY_COUNT; retry++) {
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ret = jdvbt90502_reg_read(state, 0x0096, &res1, 1);
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if (ret)
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goto error;
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/* if (res1 != 0x00) goto error; */
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ret = jdvbt90502_reg_read(state, 0x00B0, res2, sizeof(res2));
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if (ret)
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goto error;
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if (res2[0] >= 0xA7)
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break;
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msleep(100);
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}
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if (retry >= RETRY_COUNT) {
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deb_fe("%s: FE does not get ready after freq setting.\n",
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__func__);
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return -EREMOTEIO;
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}
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return 0;
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error:
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deb_fe("%s:ret == %d\n", __func__, ret);
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return -EREMOTEIO;
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}
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static int jdvbt90502_read_status(struct dvb_frontend *fe, fe_status_t *state)
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{
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u8 result;
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int ret;
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*state = FE_HAS_SIGNAL;
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ret = jdvbt90502_pll_read(fe->demodulator_priv, &result);
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if (ret) {
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deb_fe("%s:ret == %d\n", __func__, ret);
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return -EREMOTEIO;
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}
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*state = FE_HAS_SIGNAL
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| FE_HAS_CARRIER
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| FE_HAS_VITERBI
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| FE_HAS_SYNC;
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if (result & PLL_STATUS_LOCKED)
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*state |= FE_HAS_LOCK;
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return 0;
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}
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static int jdvbt90502_read_signal_strength(struct dvb_frontend *fe,
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u16 *strength)
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{
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int ret;
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u8 rbuf[37];
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*strength = 0;
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/* status register (incl. signal strength) : 0x89 */
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/* TODO: read just the necessary registers [0x8B..0x8D]? */
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ret = jdvbt90502_reg_read(fe->demodulator_priv, 0x0089,
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rbuf, sizeof(rbuf));
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if (ret) {
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deb_fe("%s:ret == %d\n", __func__, ret);
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return -EREMOTEIO;
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}
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/* signal_strength: rbuf[2-4] (24bit BE), use lower 16bit for now. */
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*strength = (rbuf[3] << 8) + rbuf[4];
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if (rbuf[2])
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*strength = 0xffff;
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return 0;
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}
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/* filter out un-supported properties to notify users */
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static int jdvbt90502_set_property(struct dvb_frontend *fe,
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struct dtv_property *tvp)
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{
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int r = 0;
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switch (tvp->cmd) {
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case DTV_DELIVERY_SYSTEM:
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if (tvp->u.data != SYS_ISDBT)
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r = -EINVAL;
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break;
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case DTV_CLEAR:
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case DTV_TUNE:
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case DTV_FREQUENCY:
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break;
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default:
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r = -EINVAL;
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}
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return r;
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}
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static int jdvbt90502_get_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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p->inversion = INVERSION_AUTO;
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p->bandwidth_hz = 6000000;
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p->code_rate_HP = FEC_AUTO;
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p->code_rate_LP = FEC_AUTO;
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p->modulation = QAM_64;
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p->transmission_mode = TRANSMISSION_MODE_AUTO;
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p->guard_interval = GUARD_INTERVAL_AUTO;
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p->hierarchy = HIERARCHY_AUTO;
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return 0;
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}
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static int jdvbt90502_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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/**
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* NOTE: ignore all the parameters except frequency.
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* others should be fixed to the proper value for ISDB-T,
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* but don't check here.
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*/
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struct jdvbt90502_state *state = fe->demodulator_priv;
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int ret;
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deb_fe("%s: Freq:%d\n", __func__, p->frequency);
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/* for recovery from DTV_CLEAN */
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fe->dtv_property_cache.delivery_system = SYS_ISDBT;
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ret = jdvbt90502_pll_set_freq(state, p->frequency);
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if (ret) {
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deb_fe("%s:ret == %d\n", __func__, ret);
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return -EREMOTEIO;
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}
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return 0;
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}
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/**
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* (reg, val) commad list to initialize this module.
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* captured on a Windows box.
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*/
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static u8 init_code[][2] = {
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{0x01, 0x40},
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{0x04, 0x38},
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{0x05, 0x40},
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{0x07, 0x40},
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{0x0F, 0x4F},
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{0x11, 0x21},
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{0x12, 0x0B},
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{0x13, 0x2F},
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{0x14, 0x31},
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{0x16, 0x02},
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{0x21, 0xC4},
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{0x22, 0x20},
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{0x2C, 0x79},
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{0x2D, 0x34},
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{0x2F, 0x00},
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{0x30, 0x28},
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{0x31, 0x31},
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{0x32, 0xDF},
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{0x38, 0x01},
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{0x39, 0x78},
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{0x3B, 0x33},
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{0x3C, 0x33},
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{0x48, 0x90},
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{0x51, 0x68},
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{0x5E, 0x38},
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{0x71, 0x00},
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{0x72, 0x08},
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{0x77, 0x00},
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{0xC0, 0x21},
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{0xC1, 0x10},
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{0xE4, 0x1A},
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{0xEA, 0x1F},
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{0x77, 0x00},
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{0x71, 0x00},
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{0x71, 0x00},
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{0x76, 0x0C},
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};
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static const int init_code_len = sizeof(init_code) / sizeof(u8[2]);
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static int jdvbt90502_init(struct dvb_frontend *fe)
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{
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int i = -1;
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int ret;
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struct i2c_msg msg;
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struct jdvbt90502_state *state = fe->demodulator_priv;
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deb_fe("%s called.\n", __func__);
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msg.addr = state->config.demod_address;
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msg.flags = 0;
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msg.len = 2;
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for (i = 0; i < init_code_len; i++) {
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msg.buf = init_code[i];
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ret = i2c_transfer(state->i2c, &msg, 1);
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if (ret != 1)
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goto error;
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}
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fe->dtv_property_cache.delivery_system = SYS_ISDBT;
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msleep(100);
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return 0;
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error:
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deb_fe("%s: init_code[%d] failed. ret==%d\n", __func__, i, ret);
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return -EREMOTEIO;
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}
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static void jdvbt90502_release(struct dvb_frontend *fe)
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{
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struct jdvbt90502_state *state = fe->demodulator_priv;
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kfree(state);
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}
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static struct dvb_frontend_ops jdvbt90502_ops;
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struct dvb_frontend *jdvbt90502_attach(struct dvb_usb_device *d)
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{
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struct jdvbt90502_state *state = NULL;
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deb_info("%s called.\n", __func__);
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/* allocate memory for the internal state */
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state = kzalloc(sizeof(struct jdvbt90502_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 = &d->i2c_adap;
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state->config = friio_fe_config;
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/* create dvb_frontend */
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state->frontend.ops = jdvbt90502_ops;
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state->frontend.demodulator_priv = state;
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if (jdvbt90502_init(&state->frontend) < 0)
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goto error;
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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 jdvbt90502_ops = {
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.delsys = { SYS_ISDBT },
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.info = {
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.name = "Comtech JDVBT90502 ISDB-T",
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.frequency_min = 473000000, /* UHF 13ch, center */
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.frequency_max = 767142857, /* UHF 62ch, center */
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.frequency_stepsize = JDVBT90502_PLL_CLK / JDVBT90502_PLL_DIVIDER,
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.frequency_tolerance = 0,
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/* NOTE: this driver ignores all parameters but frequency. */
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.caps = FE_CAN_INVERSION_AUTO |
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FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
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FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
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FE_CAN_FEC_7_8 | FE_CAN_FEC_8_9 | FE_CAN_FEC_AUTO |
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FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
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FE_CAN_TRANSMISSION_MODE_AUTO |
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FE_CAN_GUARD_INTERVAL_AUTO |
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FE_CAN_HIERARCHY_AUTO,
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},
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.release = jdvbt90502_release,
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.init = jdvbt90502_init,
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.write = _jdvbt90502_write,
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.set_property = jdvbt90502_set_property,
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.set_frontend = jdvbt90502_set_frontend,
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.get_frontend = jdvbt90502_get_frontend,
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.read_status = jdvbt90502_read_status,
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.read_signal_strength = jdvbt90502_read_signal_strength,
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};
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