/* TDA665x tuner driver Copyright (C) Manu Abraham (abraham.manu@gmail.com) 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/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include "dvb_frontend.h" #include "tda665x.h" struct tda665x_state { struct dvb_frontend *fe; struct i2c_adapter *i2c; const struct tda665x_config *config; u32 frequency; u32 bandwidth; }; static int tda665x_read(struct tda665x_state *state, u8 *buf) { const struct tda665x_config *config = state->config; int err = 0; struct i2c_msg msg = { .addr = config->addr, .flags = I2C_M_RD, .buf = buf, .len = 2 }; err = i2c_transfer(state->i2c, &msg, 1); if (err != 1) goto exit; return err; exit: printk(KERN_ERR "%s: I/O Error err=<%d>\n", __func__, err); return err; } static int tda665x_write(struct tda665x_state *state, u8 *buf, u8 length) { const struct tda665x_config *config = state->config; int err = 0; struct i2c_msg msg = { .addr = config->addr, .flags = 0, .buf = buf, .len = length }; err = i2c_transfer(state->i2c, &msg, 1); if (err != 1) goto exit; return err; exit: printk(KERN_ERR "%s: I/O Error err=<%d>\n", __func__, err); return err; } static int tda665x_get_state(struct dvb_frontend *fe, enum tuner_param param, struct tuner_state *tstate) { struct tda665x_state *state = fe->tuner_priv; int err = 0; switch (param) { case DVBFE_TUNER_FREQUENCY: tstate->frequency = state->frequency; break; case DVBFE_TUNER_BANDWIDTH: break; default: printk(KERN_ERR "%s: Unknown parameter (param=%d)\n", __func__, param); err = -EINVAL; break; } return err; } static int tda665x_get_status(struct dvb_frontend *fe, u32 *status) { struct tda665x_state *state = fe->tuner_priv; u8 result = 0; int err = 0; *status = 0; err = tda665x_read(state, &result); if (err < 0) goto exit; if ((result >> 6) & 0x01) { printk(KERN_DEBUG "%s: Tuner Phase Locked\n", __func__); *status = 1; } return err; exit: printk(KERN_ERR "%s: I/O Error\n", __func__); return err; } static int tda665x_set_state(struct dvb_frontend *fe, enum tuner_param param, struct tuner_state *tstate) { struct tda665x_state *state = fe->tuner_priv; const struct tda665x_config *config = state->config; u32 frequency, status = 0; u8 buf[4]; int err = 0; if (param & DVBFE_TUNER_FREQUENCY) { frequency = tstate->frequency; if ((frequency < config->frequency_max) || (frequency > config->frequency_min)) { printk(KERN_ERR "%s: Frequency beyond limits, frequency=%d\n", __func__, frequency); return -EINVAL; } frequency += config->frequency_offst; frequency *= config->ref_multiplier; frequency += config->ref_divider >> 1; frequency /= config->ref_divider; buf[0] = (u8) ((frequency & 0x7f00) >> 8); buf[1] = (u8) (frequency & 0x00ff) >> 0; buf[2] = 0x80 | 0x40 | 0x02; buf[3] = 0x00; /* restore frequency */ frequency = tstate->frequency; if (frequency < 153000000) { /* VHF-L */ buf[3] |= 0x01; /* fc, Low Band, 47 - 153 MHz */ if (frequency < 68000000) buf[3] |= 0x40; /* 83uA */ if (frequency < 1040000000) buf[3] |= 0x60; /* 122uA */ if (frequency < 1250000000) buf[3] |= 0x80; /* 163uA */ else buf[3] |= 0xa0; /* 254uA */ } else if (frequency < 438000000) { /* VHF-H */ buf[3] |= 0x02; /* fc, Mid Band, 153 - 438 MHz */ if (frequency < 230000000) buf[3] |= 0x40; if (frequency < 300000000) buf[3] |= 0x60; else buf[3] |= 0x80; } else { /* UHF */ buf[3] |= 0x04; /* fc, High Band, 438 - 862 MHz */ if (frequency < 470000000) buf[3] |= 0x60; if (frequency < 526000000) buf[3] |= 0x80; else buf[3] |= 0xa0; } /* Set params */ err = tda665x_write(state, buf, 5); if (err < 0) goto exit; /* sleep for some time */ printk(KERN_DEBUG "%s: Waiting to Phase LOCK\n", __func__); msleep(20); /* check status */ err = tda665x_get_status(fe, &status); if (err < 0) goto exit; if (status == 1) { printk(KERN_DEBUG "%s: Tuner Phase locked: status=%d\n", __func__, status); state->frequency = frequency; /* cache successful state */ } else { printk(KERN_ERR "%s: No Phase lock: status=%d\n", __func__, status); } } else { printk(KERN_ERR "%s: Unknown parameter (param=%d)\n", __func__, param); return -EINVAL; } return 0; exit: printk(KERN_ERR "%s: I/O Error\n", __func__); return err; } static int tda665x_release(struct dvb_frontend *fe) { struct tda665x_state *state = fe->tuner_priv; fe->tuner_priv = NULL; kfree(state); return 0; } static struct dvb_tuner_ops tda665x_ops = { .set_state = tda665x_set_state, .get_state = tda665x_get_state, .get_status = tda665x_get_status, .release = tda665x_release }; struct dvb_frontend *tda665x_attach(struct dvb_frontend *fe, const struct tda665x_config *config, struct i2c_adapter *i2c) { struct tda665x_state *state = NULL; struct dvb_tuner_info *info; state = kzalloc(sizeof(struct tda665x_state), GFP_KERNEL); if (state == NULL) goto exit; state->config = config; state->i2c = i2c; state->fe = fe; fe->tuner_priv = state; fe->ops.tuner_ops = tda665x_ops; info = &fe->ops.tuner_ops.info; memcpy(info->name, config->name, sizeof(config->name)); info->frequency_min = config->frequency_min; info->frequency_max = config->frequency_max; info->frequency_step = config->frequency_offst; printk(KERN_DEBUG "%s: Attaching TDA665x (%s) tuner\n", __func__, info->name); return fe; exit: kfree(state); return NULL; } EXPORT_SYMBOL(tda665x_attach); MODULE_DESCRIPTION("TDA665x driver"); MODULE_AUTHOR("Manu Abraham"); MODULE_LICENSE("GPL");