diff options
Diffstat (limited to 'drivers/media/common/tuners/mt2131.c')
| -rw-r--r-- | drivers/media/common/tuners/mt2131.c | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/drivers/media/common/tuners/mt2131.c b/drivers/media/common/tuners/mt2131.c new file mode 100644 index 000000000000..e254bcfc2efb --- /dev/null +++ b/drivers/media/common/tuners/mt2131.c @@ -0,0 +1,314 @@ +/* + * Driver for Microtune MT2131 "QAM/8VSB single chip tuner" + * + * Copyright (c) 2006 Steven Toth <stoth@hauppauge.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/module.h> +#include <linux/delay.h> +#include <linux/dvb/frontend.h> +#include <linux/i2c.h> + +#include "dvb_frontend.h" + +#include "mt2131.h" +#include "mt2131_priv.h" + +static int debug; +module_param(debug, int, 0644); +MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off)."); + +#define dprintk(level,fmt, arg...) if (debug >= level) \ + printk(KERN_INFO "%s: " fmt, "mt2131", ## arg) + +static u8 mt2131_config1[] = { + 0x01, + 0x50, 0x00, 0x50, 0x80, 0x00, 0x49, 0xfa, 0x88, + 0x08, 0x77, 0x41, 0x04, 0x00, 0x00, 0x00, 0x32, + 0x7f, 0xda, 0x4c, 0x00, 0x10, 0xaa, 0x78, 0x80, + 0xff, 0x68, 0xa0, 0xff, 0xdd, 0x00, 0x00 +}; + +static u8 mt2131_config2[] = { + 0x10, + 0x7f, 0xc8, 0x0a, 0x5f, 0x00, 0x04 +}; + +static int mt2131_readreg(struct mt2131_priv *priv, u8 reg, u8 *val) +{ + struct i2c_msg msg[2] = { + { .addr = priv->cfg->i2c_address, .flags = 0, + .buf = ®, .len = 1 }, + { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, + .buf = val, .len = 1 }, + }; + + if (i2c_transfer(priv->i2c, msg, 2) != 2) { + printk(KERN_WARNING "mt2131 I2C read failed\n"); + return -EREMOTEIO; + } + return 0; +} + +static int mt2131_writereg(struct mt2131_priv *priv, u8 reg, u8 val) +{ + u8 buf[2] = { reg, val }; + struct i2c_msg msg = { .addr = priv->cfg->i2c_address, .flags = 0, + .buf = buf, .len = 2 }; + + if (i2c_transfer(priv->i2c, &msg, 1) != 1) { + printk(KERN_WARNING "mt2131 I2C write failed\n"); + return -EREMOTEIO; + } + return 0; +} + +static int mt2131_writeregs(struct mt2131_priv *priv,u8 *buf, u8 len) +{ + struct i2c_msg msg = { .addr = priv->cfg->i2c_address, + .flags = 0, .buf = buf, .len = len }; + + if (i2c_transfer(priv->i2c, &msg, 1) != 1) { + printk(KERN_WARNING "mt2131 I2C write failed (len=%i)\n", + (int)len); + return -EREMOTEIO; + } + return 0; +} + +static int mt2131_set_params(struct dvb_frontend *fe, + struct dvb_frontend_parameters *params) +{ + struct mt2131_priv *priv; + int ret=0, i; + u32 freq; + u8 if_band_center; + u32 f_lo1, f_lo2; + u32 div1, num1, div2, num2; + u8 b[8]; + u8 lockval = 0; + + priv = fe->tuner_priv; + if (fe->ops.info.type == FE_OFDM) + priv->bandwidth = params->u.ofdm.bandwidth; + else + priv->bandwidth = 0; + + freq = params->frequency / 1000; // Hz -> kHz + dprintk(1, "%s() freq=%d\n", __func__, freq); + + f_lo1 = freq + MT2131_IF1 * 1000; + f_lo1 = (f_lo1 / 250) * 250; + f_lo2 = f_lo1 - freq - MT2131_IF2; + + priv->frequency = (f_lo1 - f_lo2 - MT2131_IF2) * 1000; + + /* Frequency LO1 = 16MHz * (DIV1 + NUM1/8192 ) */ + num1 = f_lo1 * 64 / (MT2131_FREF / 128); + div1 = num1 / 8192; + num1 &= 0x1fff; + + /* Frequency LO2 = 16MHz * (DIV2 + NUM2/8192 ) */ + num2 = f_lo2 * 64 / (MT2131_FREF / 128); + div2 = num2 / 8192; + num2 &= 0x1fff; + + if (freq <= 82500) if_band_center = 0x00; else + if (freq <= 137500) if_band_center = 0x01; else + if (freq <= 192500) if_band_center = 0x02; else + if (freq <= 247500) if_band_center = 0x03; else + if (freq <= 302500) if_band_center = 0x04; else + if (freq <= 357500) if_band_center = 0x05; else + if (freq <= 412500) if_band_center = 0x06; else + if (freq <= 467500) if_band_center = 0x07; else + if (freq <= 522500) if_band_center = 0x08; else + if (freq <= 577500) if_band_center = 0x09; else + if (freq <= 632500) if_band_center = 0x0A; else + if (freq <= 687500) if_band_center = 0x0B; else + if (freq <= 742500) if_band_center = 0x0C; else + if (freq <= 797500) if_band_center = 0x0D; else + if (freq <= 852500) if_band_center = 0x0E; else + if (freq <= 907500) if_band_center = 0x0F; else + if (freq <= 962500) if_band_center = 0x10; else + if (freq <= 1017500) if_band_center = 0x11; else + if (freq <= 1072500) if_band_center = 0x12; else if_band_center = 0x13; + + b[0] = 1; + b[1] = (num1 >> 5) & 0xFF; + b[2] = (num1 & 0x1F); + b[3] = div1; + b[4] = (num2 >> 5) & 0xFF; + b[5] = num2 & 0x1F; + b[6] = div2; + + dprintk(1, "IF1: %dMHz IF2: %dMHz\n", MT2131_IF1, MT2131_IF2); + dprintk(1, "PLL freq=%dkHz band=%d\n", (int)freq, (int)if_band_center); + dprintk(1, "PLL f_lo1=%dkHz f_lo2=%dkHz\n", (int)f_lo1, (int)f_lo2); + dprintk(1, "PLL div1=%d num1=%d div2=%d num2=%d\n", + (int)div1, (int)num1, (int)div2, (int)num2); + dprintk(1, "PLL [1..6]: %2x %2x %2x %2x %2x %2x\n", + (int)b[1], (int)b[2], (int)b[3], (int)b[4], (int)b[5], + (int)b[6]); + + ret = mt2131_writeregs(priv,b,7); + if (ret < 0) + return ret; + + mt2131_writereg(priv, 0x0b, if_band_center); + + /* Wait for lock */ + i = 0; + do { + mt2131_readreg(priv, 0x08, &lockval); + if ((lockval & 0x88) == 0x88) + break; + msleep(4); + i++; + } while (i < 10); + + return ret; +} + +static int mt2131_get_frequency(struct dvb_frontend *fe, u32 *frequency) +{ + struct mt2131_priv *priv = fe->tuner_priv; + dprintk(1, "%s()\n", __func__); + *frequency = priv->frequency; + return 0; +} + +static int mt2131_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth) +{ + struct mt2131_priv *priv = fe->tuner_priv; + dprintk(1, "%s()\n", __func__); + *bandwidth = priv->bandwidth; + return 0; +} + +static int mt2131_get_status(struct dvb_frontend *fe, u32 *status) +{ + struct mt2131_priv *priv = fe->tuner_priv; + u8 lock_status = 0; + u8 afc_status = 0; + + *status = 0; + + mt2131_readreg(priv, 0x08, &lock_status); + if ((lock_status & 0x88) == 0x88) + *status = TUNER_STATUS_LOCKED; + + mt2131_readreg(priv, 0x09, &afc_status); + dprintk(1, "%s() - LO Status = 0x%x, AFC Status = 0x%x\n", + __func__, lock_status, afc_status); + + return 0; +} + +static int mt2131_init(struct dvb_frontend *fe) +{ + struct mt2131_priv *priv = fe->tuner_priv; + int ret; + dprintk(1, "%s()\n", __func__); + + if ((ret = mt2131_writeregs(priv, mt2131_config1, + sizeof(mt2131_config1))) < 0) + return ret; + + mt2131_writereg(priv, 0x0b, 0x09); + mt2131_writereg(priv, 0x15, 0x47); + mt2131_writereg(priv, 0x07, 0xf2); + mt2131_writereg(priv, 0x0b, 0x01); + + if ((ret = mt2131_writeregs(priv, mt2131_config2, + sizeof(mt2131_config2))) < 0) + return ret; + + return ret; +} + +static int mt2131_release(struct dvb_frontend *fe) +{ + dprintk(1, "%s()\n", __func__); + kfree(fe->tuner_priv); + fe->tuner_priv = NULL; + return 0; +} + +static const struct dvb_tuner_ops mt2131_tuner_ops = { + .info = { + .name = "Microtune MT2131", + .frequency_min = 48000000, + .frequency_max = 860000000, + .frequency_step = 50000, + }, + + .release = mt2131_release, + .init = mt2131_init, + + .set_params = mt2131_set_params, + .get_frequency = mt2131_get_frequency, + .get_bandwidth = mt2131_get_bandwidth, + .get_status = mt2131_get_status +}; + +struct dvb_frontend * mt2131_attach(struct dvb_frontend *fe, + struct i2c_adapter *i2c, + struct mt2131_config *cfg, u16 if1) +{ + struct mt2131_priv *priv = NULL; + u8 id = 0; + + dprintk(1, "%s()\n", __func__); + + priv = kzalloc(sizeof(struct mt2131_priv), GFP_KERNEL); + if (priv == NULL) + return NULL; + + priv->cfg = cfg; + priv->bandwidth = 6000000; /* 6MHz */ + priv->i2c = i2c; + + if (mt2131_readreg(priv, 0, &id) != 0) { + kfree(priv); + return NULL; + } + if ( (id != 0x3E) && (id != 0x3F) ) { + printk(KERN_ERR "MT2131: Device not found at addr 0x%02x\n", + cfg->i2c_address); + kfree(priv); + return NULL; + } + + printk(KERN_INFO "MT2131: successfully identified at address 0x%02x\n", + cfg->i2c_address); + memcpy(&fe->ops.tuner_ops, &mt2131_tuner_ops, + sizeof(struct dvb_tuner_ops)); + + fe->tuner_priv = priv; + return fe; +} +EXPORT_SYMBOL(mt2131_attach); + +MODULE_AUTHOR("Steven Toth"); +MODULE_DESCRIPTION("Microtune MT2131 silicon tuner driver"); +MODULE_LICENSE("GPL"); + +/* + * Local variables: + * c-basic-offset: 8 + */ |