mirror of https://gitee.com/openkylin/linux.git
187 lines
4.9 KiB
C
187 lines
4.9 KiB
C
/*
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Driver for Philips tda8262/tda8263 DVBS Silicon tuners
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(c) 2006 Andrew de Quincey
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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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#include <linux/module.h>
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#include <linux/dvb/frontend.h>
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#include <asm/types.h>
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#include "tda826x.h"
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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 "tda826x: " args); \
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} while (0)
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struct tda826x_priv {
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/* i2c details */
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int i2c_address;
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struct i2c_adapter *i2c;
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u8 has_loopthrough:1;
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u32 frequency;
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};
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static int tda826x_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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return 0;
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}
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static int tda826x_sleep(struct dvb_frontend *fe)
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{
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struct tda826x_priv *priv = fe->tuner_priv;
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int ret;
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u8 buf [] = { 0x00, 0x8d };
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struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 2 };
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dprintk("%s:\n", __func__);
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if (!priv->has_loopthrough)
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buf[1] = 0xad;
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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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if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) {
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dprintk("%s: i2c error\n", __func__);
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}
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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 (ret == 1) ? 0 : ret;
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}
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static int tda826x_set_params(struct dvb_frontend *fe, struct dvb_frontend_parameters *params)
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{
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struct tda826x_priv *priv = fe->tuner_priv;
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int ret;
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u32 div;
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u32 ksyms;
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u32 bandwidth;
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u8 buf [11];
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struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 11 };
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dprintk("%s:\n", __func__);
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div = (params->frequency + (1000-1)) / 1000;
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/* BW = ((1 + RO) * SR/2 + 5) * 1.3 [SR in MSPS, BW in MHz] */
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/* with R0 = 0.35 and some transformations: */
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ksyms = params->u.qpsk.symbol_rate / 1000;
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bandwidth = (878 * ksyms + 6500000) / 1000000 + 1;
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if (bandwidth < 5)
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bandwidth = 5;
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else if (bandwidth > 36)
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bandwidth = 36;
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buf[0] = 0x00; // subaddress
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buf[1] = 0x09; // powerdown RSSI + the magic value 1
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if (!priv->has_loopthrough)
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buf[1] |= 0x20; // power down loopthrough if not needed
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buf[2] = (1<<5) | 0x0b; // 1Mhz + 0.45 VCO
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buf[3] = div >> 7;
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buf[4] = div << 1;
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buf[5] = ((bandwidth - 5) << 3) | 7; /* baseband cut-off */
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buf[6] = 0xfe; // baseband gain 9 db + no RF attenuation
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buf[7] = 0x83; // charge pumps at high, tests off
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buf[8] = 0x80; // recommended value 4 for AMPVCO + disable ports.
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buf[9] = 0x1a; // normal caltime + recommended values for SELTH + SELVTL
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buf[10] = 0xd4; // recommended value 13 for BBIAS + unknown bit set on
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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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if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) {
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dprintk("%s: i2c error\n", __func__);
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}
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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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priv->frequency = div * 1000;
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return (ret == 1) ? 0 : ret;
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}
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static int tda826x_get_frequency(struct dvb_frontend *fe, u32 *frequency)
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{
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struct tda826x_priv *priv = fe->tuner_priv;
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*frequency = priv->frequency;
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return 0;
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}
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static struct dvb_tuner_ops tda826x_tuner_ops = {
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.info = {
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.name = "Philips TDA826X",
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.frequency_min = 950000,
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.frequency_max = 2175000
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},
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.release = tda826x_release,
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.sleep = tda826x_sleep,
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.set_params = tda826x_set_params,
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.get_frequency = tda826x_get_frequency,
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};
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struct dvb_frontend *tda826x_attach(struct dvb_frontend *fe, int addr, struct i2c_adapter *i2c, int has_loopthrough)
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{
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struct tda826x_priv *priv = NULL;
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u8 b1 [] = { 0, 0 };
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struct i2c_msg msg[2] = {
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{ .addr = addr, .flags = 0, .buf = NULL, .len = 0 },
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{ .addr = addr, .flags = I2C_M_RD, .buf = b1, .len = 2 }
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};
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int ret;
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dprintk("%s:\n", __func__);
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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, 2);
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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 != 2)
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return NULL;
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if (!(b1[1] & 0x80))
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return NULL;
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priv = kzalloc(sizeof(struct tda826x_priv), GFP_KERNEL);
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if (priv == NULL)
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return NULL;
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priv->i2c_address = addr;
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priv->i2c = i2c;
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priv->has_loopthrough = has_loopthrough;
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memcpy(&fe->ops.tuner_ops, &tda826x_tuner_ops, sizeof(struct dvb_tuner_ops));
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fe->tuner_priv = priv;
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return fe;
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}
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EXPORT_SYMBOL(tda826x_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("DVB TDA826x driver");
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MODULE_AUTHOR("Andrew de Quincey");
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MODULE_LICENSE("GPL");
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