diff options
Diffstat (limited to 'drivers/media/dvb/frontends/tua6100.c')
| -rw-r--r-- | drivers/media/dvb/frontends/tua6100.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/drivers/media/dvb/frontends/tua6100.c b/drivers/media/dvb/frontends/tua6100.c new file mode 100644 index 00000000000..88554393a9b --- /dev/null +++ b/drivers/media/dvb/frontends/tua6100.c @@ -0,0 +1,205 @@ +/** + * Driver for Infineon tua6100 pll. + * + * (c) 2006 Andrew de Quincey + * + * Based on code found in budget-av.c, which has the following: + * Compiled from various sources by Michael Hunold <michael@mihu.de> + * + * CI interface support (c) 2004 Olivier Gournet <ogournet@anevia.com> & + * Andrew de Quincey <adq_dvb@lidskialf.net> + * + * Copyright (C) 2002 Ralph Metzler <rjkm@metzlerbros.de> + * + * Copyright (C) 1999-2002 Ralph Metzler + * & Marcus Metzler for convergence integrated media GmbH + * 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 "tua6100.h" + +struct tua6100_priv { + /* i2c details */ + int i2c_address; + struct i2c_adapter *i2c; + u32 frequency; +}; + +static int tua6100_release(struct dvb_frontend *fe) +{ + if (fe->tuner_priv) + kfree(fe->tuner_priv); + fe->tuner_priv = NULL; + return 0; +} + +static int tua6100_sleep(struct dvb_frontend *fe) +{ + struct tua6100_priv *priv = fe->tuner_priv; + int ret; + u8 reg0[] = { 0x00, 0x00 }; + struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = reg0, .len = 2 }; + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 1); + if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) { + printk("%s: i2c error\n", __FUNCTION__); + } + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 0); + + return (ret == 1) ? 0 : ret; +} + +static int tua6100_set_params(struct dvb_frontend *fe, + struct dvb_frontend_parameters *params) +{ + struct tua6100_priv *priv = fe->tuner_priv; + u32 div; + u32 prediv; + u8 reg0[] = { 0x00, 0x00 }; + u8 reg1[] = { 0x01, 0x00, 0x00, 0x00 }; + u8 reg2[] = { 0x02, 0x00, 0x00 }; + struct i2c_msg msg0 = { .addr = priv->i2c_address, .flags = 0, .buf = reg0, .len = 2 }; + struct i2c_msg msg1 = { .addr = priv->i2c_address, .flags = 0, .buf = reg1, .len = 4 }; + struct i2c_msg msg2 = { .addr = priv->i2c_address, .flags = 0, .buf = reg2, .len = 3 }; + +#define _R 4 +#define _P 32 +#define _ri 4000000 + + // setup register 0 + if (params->frequency < 2000000) { + reg0[1] = 0x03; + } else { + reg0[1] = 0x07; + } + + // setup register 1 + if (params->frequency < 1630000) { + reg1[1] = 0x2c; + } else { + reg1[1] = 0x0c; + } + if (_P == 64) + reg1[1] |= 0x40; + if (params->frequency >= 1525000) + reg1[1] |= 0x80; + + // register 2 + reg2[1] = (_R >> 8) & 0x03; + reg2[2] = _R; + if (params->frequency < 1455000) { + reg2[1] |= 0x1c; + } else if (params->frequency < 1630000) { + reg2[1] |= 0x0c; + } else { + reg2[1] |= 0x1c; + } + + // The N divisor ratio (note: params->frequency is in kHz, but we need it in Hz) + prediv = (params->frequency * _R) / (_ri / 1000); + div = prediv / _P; + reg1[1] |= (div >> 9) & 0x03; + reg1[2] = div >> 1; + reg1[3] = (div << 7); + priv->frequency = ((div * _P) * (_ri / 1000)) / _R; + + // Finally, calculate and store the value for A + reg1[3] |= (prediv - (div*_P)) & 0x7f; + +#undef _R +#undef _P +#undef _ri + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 1); + if (i2c_transfer(priv->i2c, &msg0, 1) != 1) + return -EIO; + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 1); + if (i2c_transfer(priv->i2c, &msg2, 1) != 1) + return -EIO; + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 1); + if (i2c_transfer(priv->i2c, &msg1, 1) != 1) + return -EIO; + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 0); + + return 0; +} + +static int tua6100_get_frequency(struct dvb_frontend *fe, u32 *frequency) +{ + struct tua6100_priv *priv = fe->tuner_priv; + *frequency = priv->frequency; + return 0; +} + +static struct dvb_tuner_ops tua6100_tuner_ops = { + .info = { + .name = "Infineon TUA6100", + .frequency_min = 950000, + .frequency_max = 2150000, + .frequency_step = 1000, + }, + .release = tua6100_release, + .sleep = tua6100_sleep, + .set_params = tua6100_set_params, + .get_frequency = tua6100_get_frequency, +}; + +struct dvb_frontend *tua6100_attach(struct dvb_frontend *fe, int addr, struct i2c_adapter *i2c) +{ + struct tua6100_priv *priv = NULL; + u8 b1 [] = { 0x80 }; + u8 b2 [] = { 0x00 }; + struct i2c_msg msg [] = { { .addr = addr, .flags = 0, .buf = b1, .len = 1 }, + { .addr = addr, .flags = I2C_M_RD, .buf = b2, .len = 1 } }; + int ret; + + 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; + + priv = kzalloc(sizeof(struct tua6100_priv), GFP_KERNEL); + if (priv == NULL) + return NULL; + + priv->i2c_address = addr; + priv->i2c = i2c; + + memcpy(&fe->ops.tuner_ops, &tua6100_tuner_ops, sizeof(struct dvb_tuner_ops)); + fe->tuner_priv = priv; + return fe; +} +EXPORT_SYMBOL(tua6100_attach); + +MODULE_DESCRIPTION("DVB tua6100 driver"); +MODULE_AUTHOR("Andrew de Quincey"); +MODULE_LICENSE("GPL"); |