/* Driver for Philips tda8262/tda8263 DVBS Silicon tuners (c) 2006 Andrew de Quincey This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <linux/module.h> #include <linux/dvb/frontend.h> #include <asm/types.h> #include "tda826x.h" static int debug; #define dprintk(args...) \ do { \ if (debug) printk(KERN_DEBUG "tda826x: " args); \ } while (0) struct tda826x_priv { /* i2c details */ int i2c_address; struct i2c_adapter *i2c; u8 has_loopthrough:1; u32 frequency; }; static int tda826x_release(struct dvb_frontend *fe) { kfree(fe->tuner_priv); fe->tuner_priv = NULL; return 0; } static int tda826x_sleep(struct dvb_frontend *fe) { struct tda826x_priv *priv = fe->tuner_priv; int ret; u8 buf [] = { 0x00, 0x8d }; struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 2 }; dprintk("%s:\n", __func__); if (!priv->has_loopthrough) buf[1] = 0xad; if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 1); if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) { dprintk("%s: i2c error\n", __func__); } if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); return (ret == 1) ? 0 : ret; } static int tda826x_set_params(struct dvb_frontend *fe, struct dvb_frontend_parameters *params) { struct tda826x_priv *priv = fe->tuner_priv; int ret; u32 div; u32 ksyms; u32 bandwidth; u8 buf [11]; struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 11 }; dprintk("%s:\n", __func__); div = (params->frequency + (1000-1)) / 1000; /* BW = ((1 + RO) * SR/2 + 5) * 1.3 [SR in MSPS, BW in MHz] */ /* with R0 = 0.35 and some transformations: */ ksyms = params->u.qpsk.symbol_rate / 1000; bandwidth = (878 * ksyms + 6500000) / 1000000 + 1; if (bandwidth < 5) bandwidth = 5; else if (bandwidth > 36) bandwidth = 36; buf[0] = 0x00; // subaddress buf[1] = 0x09; // powerdown RSSI + the magic value 1 if (!priv->has_loopthrough) buf[1] |= 0x20; // power down loopthrough if not needed buf[2] = (1<<5) | 0x0b; // 1Mhz + 0.45 VCO buf[3] = div >> 7; buf[4] = div << 1; buf[5] = ((bandwidth - 5) << 3) | 7; /* baseband cut-off */ buf[6] = 0xfe; // baseband gain 9 db + no RF attenuation buf[7] = 0x83; // charge pumps at high, tests off buf[8] = 0x80; // recommended value 4 for AMPVCO + disable ports. buf[9] = 0x1a; // normal caltime + recommended values for SELTH + SELVTL buf[10] = 0xd4; // recommended value 13 for BBIAS + unknown bit set on if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 1); if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) { dprintk("%s: i2c error\n", __func__); } if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); priv->frequency = div * 1000; return (ret == 1) ? 0 : ret; } static int tda826x_get_frequency(struct dvb_frontend *fe, u32 *frequency) { struct tda826x_priv *priv = fe->tuner_priv; *frequency = priv->frequency; return 0; } static struct dvb_tuner_ops tda826x_tuner_ops = { .info = { .name = "Philips TDA826X", .frequency_min = 950000, .frequency_max = 2175000 }, .release = tda826x_release, .sleep = tda826x_sleep, .set_params = tda826x_set_params, .get_frequency = tda826x_get_frequency, }; struct dvb_frontend *tda826x_attach(struct dvb_frontend *fe, int addr, struct i2c_adapter *i2c, int has_loopthrough) { struct tda826x_priv *priv = NULL; u8 b1 [] = { 0, 0 }; struct i2c_msg msg[2] = { { .addr = addr, .flags = 0, .buf = NULL, .len = 0 }, { .addr = addr, .flags = I2C_M_RD, .buf = b1, .len = 2 } }; int ret; dprintk("%s:\n", __func__); if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 1); ret = i2c_transfer (i2c, msg, 2); if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); if (ret != 2) return NULL; if (!(b1[1] & 0x80)) return NULL; priv = kzalloc(sizeof(struct tda826x_priv), GFP_KERNEL); if (priv == NULL) return NULL; priv->i2c_address = addr; priv->i2c = i2c; priv->has_loopthrough = has_loopthrough; memcpy(&fe->ops.tuner_ops, &tda826x_tuner_ops, sizeof(struct dvb_tuner_ops)); fe->tuner_priv = priv; return fe; } EXPORT_SYMBOL(tda826x_attach); module_param(debug, int, 0644); MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); MODULE_DESCRIPTION("DVB TDA826x driver"); MODULE_AUTHOR("Andrew de Quincey"); MODULE_LICENSE("GPL");